RF ACTIVE COMPOSITIONS FOR USE IN ADHESION, BONDING AND COATING

Abstract: A susceptor composition that can bond two or more layers or substrates to one another and that can be used to coat a cut substrate. The susceptor composition is activated in the presence of radio frequency (RF) energy. In one embodiment, the susceptor composition of the present invention comprises a susceptor and a carrier. The carrier and susceptor are blended with one another and form a mixture, preferably a uniform mixture. The susceptor is present in an amount effective to allow the susceptor composition to be heated by RF energy. In a preferred embodiment, the susceptor also functions as an adhesive. The susceptor is an ionic or polar compound and acts as either a charge-carrying or an oscillating/vibrating component of the susceptor composition. The susceptor generates thermal energy in the presence of an RF electromagnetic or electrical field (hereafter RF field). According to the present invention, the susceptor can be an inorganic salt (or its respective hydrate), such as stannous chloride (SnCl2) or lithium perchlorate (LiC1O4), or an organic salt, such as lithium acetate (LiC2H3O2). The susceptor can be a non-ferromagnetic ionic salt. The susceptor can also be a polymeric ionic compound ("ionomer") which preferably also functions as an adhesive and/or coating. Under RF power levels of about 0.5 kilowatt (kW) to 1kW, and frequencies of about 1 to 100 MHz, the susceptor composition of the present invention facilitates the bonding of single layers of polymeric materials such as polyolefins, non-polyolefins, and non-polymeric materials, as well as multilayer stacks of these materials.

Description: RF Active Compositions for Use in Adhesion, Bonding and Coating Background ofthe Invention Field ofthe Invention This invention relates generally to the use of media containing ionic compounds and/or nonionic compounds with high dipole moments as a radio frequency (RF) susceptors in RF activated systems. Related Art Radio frequency (RF) heating is a well established non-contact precision heating method that is used to generate heat directly within RF susceptors, and indirectly within materials that are in thermally conductive contact with RF susceptors. RF susceptors are materials that have the ability to couple and convert RF energy into heat energy within the material. Conventional adhesives are not suitable RF susceptors that can be directly heated and activated by RF heating. Rather, these conventional adhesives are typically heated indirectly through thermally conductive contact with an RF susceptor material. FIG. 1 illustrates two conventional methods that are currently used in industry for indirect RF heating of conventional adhesives: The first method is illustrated in FIG. 1A, where susceptor material 102 exists as a bulk macroscopic layer. RF susceptor material 102 is directly heated by RF energy, and adhesive layer 104 is indirectly heated through thermally conductive contact with RF susceptor material 102. For example, adhesive layer 104 may be applied to a continuous surface of susceptor material 102, such as steel or aluminum. The second method is illustrated in FIG. IB, where susceptor material 1 12 consists of discrete macroscopic particles. Adhesive layer 1 14 is loaded with macroscopic particles of a RF susceptor material 1 12, such as macroscopic particles or flakes of metal oxides, metallic alloys, or aluminum With this conventional method, each RF susceptor particle 1 12 acts as a discrete RF susceptor, generating heat throughout adhesive layer 1 14 An example of a conventional RF energy activated composition, such as that shown in FIG IB, is described in U S Patent No 5,378,879, issued to Monovoukas ("Monovoukas") Monovoukas utilizes macroscopic "loading particles" as discrete RF susceptors The particles are heated by RF energy and in turn conduct heat to the surroundings These macroscopic loading particles are thin flakes (l e in thin disk-like configuration) that are designed to be admixed to relatively thick extruded materials However, these flakes are not well suited for use as susceptors in thin film bonding applications in which physical distortions, discolorations in the surface, or opacity ofthe bonded films would result from the flakes Another example of a conventional inductively activated adhesive is described in U S Patent No 3,574,031 , issued to Heller et al ("Heller") Heller describes a method of heat welding thermoplastic bodies using an adhesive layer that contains uniformly dispersed macroscopic RF susceptors, typically iron oxide particles These discrete RF susceptor particles are ferromagnetic in nature A disadvantage of this type of method is that a tradeoff must be made between the size ofthe particle employed versus the power level and duration ofthe inductive heating process For example, if susceptor particles are kept small in size, the mechanical strength ofthe bond tends to increase However, as the size of these discrete susceptors is reduced, the power levels and dwell times required to heat the RF susceptor material and achieve acceptable bonds tend to increase Another disadvantage of this type of method is the high levels of loading of the medium with RF susceptor particles that is required for efficient activation Such high loading levels detract from the physical properties and rheology ofthe adhesive composition Still another disadvantage is the dark color and opacity of the composition, which renders the composition undesirable for many applications -j - An example of adhesive activated by a dielectric process is described in U S Patent No 5,661,201, issued to Degrand ("Degrand") Degrand describes a thermoplastic film including at least one ethylene copolymer and a sufficient quantity of N,N-ethylene-bisstearamide that is capable of being sealed utilizing a current at a frequency of about 27 12 megahertz (MHz) A disadvantage of this type of film and sealing process is the inherent tendency to also heat the adherand U S Patent No 5, 182, 134, issued to Sato, discloses methods of curing a thermoset composition by applying an RF signal having a frequency of about 1 to 100 MHz to a composition comprising a major portion of a thermoset and a receptor The receptor is described as being one of the alkali or alkaline earth metal sulfate salts (e g calcium sulfate), aluminum trihydrate, quaternary ammonium salts, phosphonate compounds, phosphate compounds, polystyrene sulfonate sodium salts or mixtures thereof According to this patent, all of the exemplified compositions took longer than one second to heat U S Patent No 5,328,539, issued to Sato, discloses methods of heating thermoplastic susceptor compositions by applying an RF signal having a frequency of about 1 to 100 MHz The susceptors are described as being one ofthe alkali or alkaline earth metal sulfate salts (e g calcium sulfate), aluminum trihydrate, quaternary ammonium salts, phosphonate compounds, phosphate compounds, polystyrene sulfonate sodium salts or mixtures thereof According to this patent, all ofthe exemplified compositions took longer than one second to heat U S Patent No 4,360,607, issued to Thorsrud, discloses a composition suitable for sensitizing thermoplastic compositions to the heating effects of microwave energy comprising (1) an alcohol amine or derivative thereof, (2) a simple or polymeric alkylene glycol or derivative thereof, (3) silica and, optionally, (4) a plasticizer What is needed is a composition (e g adhesive composition or coating) containing either dissolved or finely dispersed susceptor constituents that are preferably colorless or of low color Further, the composition should be transparent or translucent throughout an adhesive matrix or plastic layer This type of RF susceptor will result in more direct and uniform heating throughout an adhesive matrix or plastic layer. Further, it is desirable that such a composition will allow bonding with no physical distortion or discoloration in the bonded region of thin films. Still another desirable feature is activation of the RF susceptors at frequencies, e.g. of about 15 MHz or below, most preferably about 13.5 MHz, which are more economical to generate than higher frequencies and do not substantially heat dielectric substrates. A further desirable feature is that the composition can be activated or melted in less than one second. It is also desirable to have a formulation which may be optimized for a particular application, such as cutting, coating, or bonding substrates. Summary ofthe Invention The present invention generally relates to the creation and use of a composition (also referred to as a "susceptor composition") that can bond two or more layers or substrates to one another and that can be used to coat or cut a substrate. The susceptor composition is activated in the presence of radio frequency (RF) energy. In one embodiment, the susceptor composition of the present invention comprises a susceptor and a carrier. The carrier and susceptor are blended with one another and form a mixture, preferably a substantially uniform mixture. The susceptor is present in an amount effective to allow the susceptor composition to be heated by RF energy. In a preferred embodiment, the susceptor also functions as an adhesive or coating. In another embodiment ofthe present invention, the susceptor composition further comprises an adhesive compound. The adhesive compound, susceptor, and carrier are blended with one another to form a mixture that is activated in the presence of RF energy. Preferably, the mixture is substantially uniform. In another embodiment ofthe present invention, the susceptor composition further comprises at least one of a thermoplastic polymer, thermoset resin, elastomer, plasticizer, filler or other material. The additive, susceptor, and carrier are blended with one another to form a mixture that is activated in the presence of RF energy In yet another embodiment ofthe present invention, the composition can further comprise a second carrier that is an insoluble porous carrier that is saturated with the composition The susceptor is an ionic or polar compound and acts as either a charge- carrying or an oscillating/vibrating component ofthe susceptor composition The susceptor generates thermal energy in the presence of an RF electromagnetic or electrical field (hereafter RF field) According to the present invention, the susceptor can be an inorganic salt (or its respective hydrate), such as stannous chloride (SnCl 2 ), zinc chloride (ZnCl 2 ) or other zinc salt, or lithium perchlorate (LιClO 4 ), or an organic salt, such as lithium acetate (LιC 2 H 3 O 2 ) The susceptor can be a non-ferromagnetic ionic salt The susceptor can also be a polymeric ionic compound ("ionomer") which preferably also functions as an adhesive or coating Under RF power levels of about 05 kilowatt (kW) to 1 kW, and frequencies of about 1 to 100 MHz, the susceptor composition ofthe present invention facilitates (a) the bonding of single layers of polymeric materials such as polyolefins, non- polyolefins, and non-polymeric materials, as well as multilayer stacks of these materials, and (b) coating on a substrate such as a printed pattern on plastic films, metallic foils, etc Surprisingly, it has been discovered that when an ionomer is combined with a polar carrier, much more heating occurs when exposed to RF energy than when the ionomer or carrier is exposed separately to RF energy According to another embodiment ofthe present invention, a method of bonding a first material or substrate to a second material or substrate comprises interposing a composition according to the invention between the first and second materials and applying RF energy to the composition to heat the composition, thereby causing the first and second materials to become bonded In one embodiment, the composition comprises a susceptor and a carrier that are distributed in one another to form a mixture, preferably, a substantially uniform mixture Optionally, the composition may further comprise other compounds and additives as described herein The susceptor is present in the composition in an amount effective to allow the composition to be heated bv RF energy According to another embodiment of the present invention, a method of bonding or adhering a first substrate to a second substrate includes applying a first composition onto the first substrate, applying a second composition onto the second substrate, contacting the first composition with the second composition, applying RF energy to the first and second compositions to heat the compositions, thereby causing the first and second substrates to become adhered or bonded, wherein one of the compositions comprises a susceptor and the other of the susceptors is a polar carrier, and the susceptor and/or the carrier are present in amounts effective to allow the first and second compositions to be heated by RF energy According to yet another embodiment ofthe present invention, a method of bonding or adhering a first substrate to a second substrate includes applying a first composition onto the first substrate, applying a second composition onto the first composition, contacting the second substrate with the second composition, and applying RF energy to the first and second compositions to heat the compositions, thereby causing the first and second substrates to become adhered or bonded, wherein one ofthe compositions comprises a susceptor and the other of the compositions is a polar carrier, and the susceptor and/or the carrier are present in amounts effective to allow the first and second compositions to be heated by RF energy According to another embodiment of the present invention, a method of making a susceptor composition comprises admixing a susceptor and a carrier, wherein, preferably, the carrier and susceptor are substantially uniformly dispersed in one another and form a uniform mixture The susceptor and/or carrier are present in the composition in an amount effective to allow the susceptor composition to be heated by RF energy According to a further embodiment ofthe present invention, an adhered or a bonded composition can be obtained according to the disclosed methods According to a further embodiment of the present invention, a kit for bonding a first material to a second material comprises one or more containers, wherein a first container contains a composition comprising a susceptor and a carrier that are dispersed in one another and form a mixture The kit may also contain an adhesive or elastomeπc compound or other additives as disclosed herein The susceptor and/or carrier are present in an amount effective to allow the composition to be heated by radio frequency energy According to a further embodiment of the present invention, a kit for adhering or bonding a first substrate to a second substrate, comprises at least two containers, wherein one ofthe containers comprises a susceptor and another ofthe containers comprises a polar carrier, wherein when the susceptor and the carrier are applied to substrates and the susceptor and carrier are interfaced, a composition is formed that is heatable by RF energy The invention also relates to a composition comprising an lonomeπc polymer and a polar carrier The invention also relates to a method of curing a thermoset resin, comprising combining the thermoset resin with a polar carrier to give a mixture and exposing the mixture to RF energy The invention relates to an apparatus, having a first portion having a first mating surface, a second portion, having a second mating surface, a composition disposed between the first mating surface and the second mating surface, wherein the composition comprises a susceptor and a polar carrier wherein the susceptor and/or the polar carrier are present in amounts effective to allow the composition to be heated by RF energy, and wherein the composition adheres the first mating surface to the second mating surface such that application of a force to separate the first mating surface and the second mating surface results in breakage ofthe apparatus unless the composition is in a melted state The invention also relates to a method of applying a protective film or printed image/ink on a substrate The invention also relates to a method for dynamically bonding a first adherand to a second adherand The method includes (1) creating an article of manufacture comprising the first adherand, the second adherand, and a composition, the composition being between the first adherand and the second adherand, wherein the composition can be activated in the presence of an RF field; (2) moving the article of manufacture along a predetermined path; (3) generating along a portion ofthe predetermined path an RF field having sufficient energy to activate the composition, wherein the composition is activated by its less than one second exposure to the RF field. The invention also relates to a method for applying a susceptor composition to a substrate. In one embodiment, the method includes: (1) formulating the susceptor composition as a liquid dispersion; (2) applying the liquid dispersion of the susceptor composition to the substrate; (3) drying the susceptor composition, wherein the drying step includes the step of applying RF energy across the composition, thereby generating heat within the liquid dispersion. In a preferred embodiment, one may roll up the substrate after the susceptor composition has dried. The invention also relates to a method for cutting a substrate. The method includes: (1) applying a composition to a portion of the substrate, wherein the composition comprises a susceptor and polar carrier wherein the susceptor and/or said polar carrier are present in amounts effective to allow the composition to be heated by RF energy, and wherein the portion of the substrate defines a first section of the substrate and a second section of the substrate; (2) melting the portion ofthe substrate by heating the composition via RF energy; and (3) after the portion ofthe substrate has begun to melt, applying a force to the substrate to separate the first section from the second section. The method also relates to a method of dynamically bonding a first substrate to a second substrate. The method including: applying a composition onto the first substrate; after applying the composition onto the first substrate, forming a roll ofthe first substrate; storing the roll; unrolling the roll; and while unrolling the roll: joining an unrolled portion ofthe first substrate with a portion ofthe second substrate such that the portion ofthe second substrate is in contact with a portion ofthe composition applied onto the first substrate; and applying RF energy to the portion ofthe composition, wherein the portion ofthe composition heats and melts as a result ofthe RF energy being applied thereto Further features and advantages of the present invention, as well as the structure and operation of various embodiments of the present invention, are described in detail below with reference to the accompanying drawings Brief Description ofthe Drawings The present invention is described with reference to the accompanying drawings In the drawings, like reference numbers indicate identical or functionally similar elements Additionally, the left-most dιgιt(s) of a reference number identifies the drawing in which the reference number first appears FIGs 1A and IB illustrate conventional schemes for inductively heating adhesives FIG 2 shows an RF active composition according to the present invention FIG 3 shows a susceptor composition placed between two polyolefin layers to be attached according to the present invention FIG 4 illustrates a block diagram of an RF heating system according to a first embodiment FIG 5 illustrates a block diagram of a heating system according to a second embodiment FIG 6 illustrates a two probe heating system FIGS 7A and 7B further illustrate the two probe heating system FIG 8 illustrates one embodiment of an alternating voltage supply FIG 9 is a flow chart illustrating a process for heating a composition according to the present invention FIG 10 further illustrates one embodiment of an impedance matching circuit FIG 1 1 shows a method of bonding adherents using a composition that is activated in the presence of RF energy FIGS 12 to 17 illustrate additional embodiments of probes 602 and 604 FIG 18 illustrates one embodiment of an application system for applying a composition according to the present invention to a substrate FIG 19 illustrates one embodiment of a system for bonding or adhering various adherents FIGS 20A and 20B illustrates a static bonding system for bonding adherents FIG 21 illustrates an in-line bonding system FIG 22 further illustrates one embodiment ofthe in-line bonding system illustrated in FIG 21 FIGS 23-27 illustrate alternative designs of the in-line bonding system illustrated in FIG 21 FIGS 28A and 28B illustrate one embodiment of a system for the manufacture of flexible packaging material FIG 29 further illustrates film 2815 FIG 30 illustrates one embodiment of film 2870 FIG 31 illustrates an alternative system for manufacturing an RF activated adhesive film for use in the flexible packaging industry FIG 32 illustrates a conventional aseptic package material construction FIG 33 illustrates an aseptic package material according to one embodiment that does not include metallic foil FIG 34 illustrates another embodiment of an aseptic packaging material construction that does not use metallic foils FIG. 35 illustrates a conventional cap sealing construction FIG. 36 illustrates a seal, according to one embodiment, for sealing a bottle FIG. 37 illustrates a design for adhering a flexible bag to an outer box FIG 38 illustrates a step and repeat manufacturing system FIG 39 illustrates an index table bonding system FIG 40 shows an example experimental set-up utilized to test compositions according to the present invention FIG 41 illustrates another experimental set-up for testing compositions according to the present invention FIG 42 illustrates test probes FIG 43 illustrates a process for assembling a book, magazine, or periodical, or the like FIG 44 illustrates a paper substrate coated with a susceptor composition FIG 45 illustrates a stack of coated paper substrates FIGS 46 and 47 illustrates one embodiment of an envelope or mailer according to the present invention FIG 48 illustrates a cross-section of a container sealed with a susceptor composition ofthe present invention FIG 49 illustrates another example of a device sealed or otherwise joined together with a composition ofthe present invention FIG. 50 shows another example of a device sealed or otherwise joined together with a composition ofthe present invention FIG 51 illustrates still another example of a cross-section of a container 5100 that has been sealed with the adhesive ofthe present invention FIG 52 illustrates a system for bonding two substrates FIG 53 illustrates another embodiment of a system for bonding two substrates Detailed Description ofthe Preferred Embodiments /. Oven etv and Discussion ofthe Invention //. Terminology A. Sulfonated Polyesters B. Acrylic Acid Polymers and Copolymers C. Starch/Polysaccharide Derivatives D. Proteins E. Others III. The Polar Carrier IV. Further Additives to the Susceptor Compositions A. Adhesive/Thermoplastic Additives B. Adhesive/Coating Thermoset Additives C. Surfactan t A dditives D. Plasticizer Additives E. Tackifiers F. Fillers G. Stabilizers and Antioxidants H. Other Additives V. Applying the Susceptor Compositions to Substrates VI. Apparatus For Activating the Various Compositions of the Present Invention VII. Method of Bonding Substrates VIII. Additional Probe Embodiments IX. Applicator System for Applying a Composition of the Present Invention to a Substrate/Adherand X. Systems for Adhering or Bonding two A dherands. XI. Exemplary Specific Applications ofthe Present Invention A. Manufacture of Flexible Packaging B. Food Packaging and Cap Sealing C. Printing Applications D. Bookbinding and Mailers E. Security Devices F. Thermal Destruction XII. Kits XIII. Experimental Set-up XIV. Examples I. Overview and Discussion ofthe Invention The present invention is directed towards an RF susceptor composition and methods and systems of bonding, cutting, and/or coating substrates and surfaces using the susceptor composition. The susceptor composition is a mixture of RF susceptors and/or adhesive/coating compounds and/or other additives dissolved or finely dispersed in a matrix. Preferably, the RF susceptors and/or adhesive compounds and/or other additives are uniformly dissolved or finely dispersed in the matrix. The susceptor composition is capable of coupling efficiently in an RF field having a frequency of about 15MHz or below. In order to be useful in industry and commercial products, a susceptor composition preferably has the following characteristics: (1) an activation time in the presence of a low power RF field on the order of 1 second or less, (2) adequate bond or adhesive strength for the intended use, (3) transparency or translucency and only slight coloration (if any), (4) minimal distortion of the substrates being attached, and (5) on demand bonding of preapplied adhesive. Further, it is desirable that the susceptor composition have coupling ability in the absence of volatile solvents, although the presence of nonvolatile liquids (such as plasticizers) may be desirable. These characteristics are important in providing sufficient heat transfer to the substrates or layers to be bonded to one another, or for adhesion to take place at the interface. Additionally, the susceptor composition should not interfere with the thermal bonding or inherent adhesive properties ofthe substrates or layers to be bonded or adhered to one another. According to the present invention, a susceptor composition used to bond or adhere substrates or layers can be directly heated by exposure to an RF field having frequencies ranging from 1 - 100 MHz. The susceptor composition comprises a susceptor, and a carrier blended with one another to form a mixture. In addition, the susceptor composition can further comprise one or more adhesive compounds blended with the susceptor and carrier to form the mixture. Susceptors are either ionic or polar compounds introduced as a component of a composition, such that RF heating of the resulting susceptor composition occurs. An ionic susceptor is an ionic compound introduced as a sufficiently charge-carrying or oscillating component ofthe composition. A polar susceptor is a polar compound which has sufficiently high dipole moment that molecular oscillations or vibrations ofthe compound occur when exposed to an RF field. As shown in FIG. 2, a susceptor composition 202 comprises a continuous mixture of susceptors such as microscopic, ionic salts or polymeric ionic compounds or dipoles 204, which generate thermal energy in the presence ofthe RF field. It has been discovered that acceptable bonding results occur with inorganic salts such as stannous chloride (SnCl 2 ); zinc salts such as chloride (ZnCl 2 ), bromide (ZnBr 2 ) and the like; and lithium perchlorate (LiClO 4 ), and organic salts such as lithium acetate (LiC 2 H 3 O 2 ). These salts or combination of salts, when distributed in the mixture, create an ionic and/or polar medium capable of being heated by RF energy. II. Terminology "RF Energy" means an alternating electromagnetic field having a frequency within the radio frequency spectrum. A "susceptor composition" comprises a susceptor and a carrier interfaced with one another and/or mixed or blended together. Preferably, the susceptor and carrier are mixed together. More preferably, the susceptor and carrier are substantially uniformly mixed together. In another embodiment, the susceptor and carrier are interfaced together by disposing a layer ofthe susceptor onto a layer ofthe carrier or visa versa. In this embodiment, the susceptor may be coated onto a first substrate and the carrier, with or without added ingredients such as a wax or other additives that prevent the carrier from evaporating substantially, may be coated onto a second substrate. The first and second substrates containing the susceptor and carrier layers, respectively, may then be brought into contact or interfaced and activated then or at a later time. The susceptor compositions ofthe invention may further comprise one or more adhesive compounds or other additives mixed, preferably substantially uniformly mixed, together with the susceptor and the carrier. The susceptor composition is activated in the presence of radio frequency (RF) energy. The susceptor composition can be used to bond two or more layers or substrates to one another, can be used as a coating, and can be used to thermally cut substrates A "carrier" provides the mobile medium in which the susceptors are dissolved, distributed, or dispersed Preferably the carrier is a polar carrier as defined below which enhances the activation ofthe compositions Carriers (also referred to as mobile media) can be liquids, such as solvents and plastisizers or polymers that are utilized for their polar functionality and for their ability to be heated by RF energy An "adhesive compound" refers to polymers, copolymers and/or lonomers as described herein that are blended into the susceptor composition to enhance its adhesive properties "Bonding" is defined as the joining of one substrate to another substrate to cause a physical joining process to occur "Adhesion" is an interaction between two adherands at their interface such that they become attached or joined A "substantially transparent" mixture refers to a mixture that transmits greater than about 50% of incident visible light "Thermal bonding" or "welding" is defined as the reflowing of one substrate into another substrate to cause a physical joining process to occur "Mechanical bonding" occurs between adherands when a susceptor composition holds the adherands together by a mechanical interlocking action An RF "susceptor" converts coupled RF energy into heat energy in the susceptor composition According to the present invention, the susceptor, as described above, is either the charge carrying or oscillating ionic compound or the oscillating polar compound having a sufficiently high dipole moment comprising a composition to generate thermal energy in the presence of an RF field Generally, the susceptor can be a salt For example, the susceptor can be an inorganic salt or its respective hydrate(s), such as stannous chloride (SnCl ), stannous chloride dihydrate (SnCl 2 x 2H 2 O), lithium perchlorate (LιClO 4 ) lithium perchlorate trihydrate (LιClO 4 x 3H,O) or an organic salt, such as an alkali metal salt of a C,. 4 alkanoic acid such as lithium acetate (LιC 2 H 3 O 2 ), lithium acetate dihydrate (LiC 2 H 3 O 2 x 2H 2 O), or sodium acetate and the like, alkali metal salts of arylcarboxylic acids such as lithium benzoate, sodium benzoate, and the like, alkali metal salts of alkyl and aryl sulfonates such as sodium methylsulfonate and sodium ?-toluenesulfonate and the like Other types of salts and their respective hydrates include, but are not limited to, magnesium acetate, magnesium nitrate, sodium- based salts (such as sodium chloride, sodium bromide and the like), lithium-based salts (such as lithium bromide, lithium carbonate, lithium chloride, etc ) and potassium-based salts Many of these salts are commercially available from Aldrich Chemical Company, Milwaukee, WI See the Aldrich Catalog Handbook of Fine Chemicals 1996-1997 It is not intended that this list of salts is an exclusive or comprehensive list These salts are disclosed as typical examples The present invention is not restricted to the listed salts, as would be apparent to those of skill in the art The susceptor can also be an ionomer Preferably, the ionomer also functions as an adhesive and/or coating Examples of such ionomers include without limitation styrenated ethylene-acrylic acid copolymer or its salts, sulfonated polyesters and their salts, sulfonated polystyrene and its salts and copolymers, polyacrylic acid and its salts and copolymers, hydroxy/carboxylated vinylacetate-ethylene terpolymers, functionalized acrylics, polyesters, urethanes, epoxies, alkyds, latex, gelatin, soy protein, casein and other proteins, alginate, carrageenan, starch derivatives, ionic polysacharides, and the like An example of an ionomer that does not function as an adhesive is sodium polystyrenesulfonate Examples of ionomer adhesives are described in more detail below A. Sulfonated Polyesters Sulfonated polyesters and copolymers thereof are described in U.S. Patent Nos. 5,750,605, 5,552,495, 5,543,488, 5,527,655, 5,523,344, 5,281,630, 4,598,142, 4,037,777, 3,033,827, 3,033,826, 3,033,822, 3,075,952, 2,901,466, 2,465,319, 5,098,962, 4,990,593, 4,973,656, 4,910,292, 4,525,524, 4,408,532, 4,304,901 , 4,257,928, 4,233, 196, 4, 1 10,284, 4,052,368, 3,879,450 and 3,018,272 The invention relates to compositions comprising sulfonated polyesters and copolymers thereof, e g as described in these patents, together with a polar carrier as described herein as well as the adhesive compositions described in these patents (comprising the sulfonated polyesters and copolymers thereof) together with the polar carrier Such sulfonated polyesters and copolvmers thereof are one preferred embodiment of the present invention, as such materials function both as an lonomeπc susceptor and as an adhesive In another embodiment, a salt comprising a sulfonated polyester and a cationic dye as described in U S Patent No 5,240,780, are employed Such salts provide a colored susceptor composition that may be used, e g in printing Sulfonated polyesters may be prepared by the polycondensation of the following reactants (a) at least one dicarboxy c acid, (b) at least one glycol, (c) at least one difunctional sulfomonomer containing at least one metal sulfonate group attached to an aromatic nucleus wherein the functional groups may be hydroxy, carboxyl, or amino groups The dicarboxyhc acid component ofthe sulfonated polyesters comprises aliphatic dicarboxyhc acids, a cyclic dicarboxyhc acids, aromatic dicarboxyhc acids, or mixtures of two or more of these acids Examples of such dicarboxyhc acids include oxalic, malonic, dimethylmalonic, succinic, glutaπc, adipic, tπmethyladipic, pime c, 2,2-dιmethylglutaπc, azelaic, sebacic, fumaπc, maleic, itaconic, 1,3-cyclopentanedιcarboxlyιc, 1,2-cyclohexanedιcarboxylιc, 1,3- cyclohexanedicarboxylic, 1 ,4-cyclohexanedicarboxyhc, phthahc, terephthalic, lsophtha c, 2,5-norbornanedicarboxyhc, 1 ,4-naphthalιc, diphenic, 4,4'- oxydibenzoic, diglyco c, thiodpropionic, 4,4'-sulfonyldιbenzoιc, and 2,5- naphthalenedicarboxy c acids If terephthalic acid is used as the dicarboxyhc acid component ofthe polyester, at least 5 mole percent of one ofthe other acids listed above may also be used It should be understood that use of the corresponding acid anhydrides, esters, and acid chlorides of these acids is included in the term "dicarboxyhc acid " Examples of these esters include dimethyl 1 ,4-cyclohexanedιcarboxylate, dimethyl 2,5-naphthalenedιcarboxylate, dibutyl, 4,4'-sulfonyldιbenzoate, dimethyl isophthalate, dimethyl terephathalate, and diphenyl terephthalate Copolyesters may be prepared from two or more ofthe above dicarboxyhc acids or derivatives thereof Examples of suitable glycols include poly(ethylene glycols) such as diethylene glycol, triethylene glycol, tetraethylene glycol, and pentaethylene, hexaethylene, heptaethylene, octaethylene, nonaethylene, and decaethylene glycols, and mixtures thereof Preferably the poly(ethylene glycol) employed in the present invention is diethylene glycol or triethylene glycol or mixtures thereof The remaining portion ofthe glycol component may consist of aliphatic, a cyclic, and aralkyl glycols Examples of these glycols include ethylene glycol, propylene glycol, 1,3-propanedιol, 2,4-dιmethyl-2-ethylhexane-l ,3,dιol, 2,2-dιmethyl-l,3- propanediol, 2-ethyl-2-butyl-l,3-propanediol, 2-ethyl-2-ιsobutyl-l,3-propanedιol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, l,6-hexanedιol, 2,2-4-trimethyl- 1 ,6-hexanediol, thiodiethanol, 1 ,2-cyclohexanedιmethanol, 1 ,3- cyclohexanedimethanol, 1,4-cyclohexanedιmethanol, 2,2,4,4-tetramethyl-l ,3- cyclobutanediol, p-xylylenediol Copolymers may be prepared from two or more ofthe above glycols The difunctional sulfo-monomer component of the sulfonated polyester may advantageously be a dicarboxyhc acid or an ester thereof containing a metal sulfonate group or a glycol containing a metal sulfonate group or a hydroxy acid containing metal sulfonate group Advantageous difunctional sulfo-monomer components are those wherein the sulfonate salt group is attached to an aromatic acid nucleus such as benzene, naphthalene, diphenyl, oxydiphenyl, sulfonyldiphenyl, or methylenediphenyl nucleus Particular examples include sulfophthalic acid, sulfoterephthahc acid, sulfoisophthahc acid, 4-sulfonaphthalene-2,7-dicarboxyhc acid, and their esters, metalosulfoaryl sulfonate having the general formula O ^ II X S — O — Y— S0 2 — M n B^ II o wherein X is a tπvalent aromatic radical derived from a substituted or unsubstituted aromatic hydrocarbon, Y is a divalent aromatic radical derived from a substituted or unsubstituted aromatic hydrocarbon A and B are carboalkoxy groups containing 1 to 4 carbon atoms in the alkyl portion or a carboxv group, the metal ion M is Li Na\ K , Mg \ Ca ' , Ba , Cu", Fe * \ Fe " , and n is 1 for monovalent M or 2 for divalent M or 3 for tπvalent M When a monovalent alkali metal ion is used the resulting sulfonated polyesters are less readilv dissipated b> cold water and more rapidly dissipated bv hot water When a divalent or a tπvalent metal ion is used, the resulting sulfonated polyesters are not ordinarily easily dissipated bv cold water, but are more readily dissipated in hot water Depending on the end use ofthe polymer, either ofthe different sets of properties may be desirable It is possible to prepare the sulfonated polyester using, for example, a sodium sulfonate salt and later by ion-exchange replace this ion with a different ion, for example, calcium, and thus alter the characteristics of the polvmer In general, this procedure is superior to preparing the polymer with divalent metal salt inasmuch as the sodium salts may be more soluble in the polvmer manufacturing components than are the divalent metal salts Polymers containing divalent or tπvalent metal ions are less elastic and rubber-like than polymers containing monovalent ions One such metallosulfoaryl sulfonate component may be prepared as shown bv the following general reactions O ROOC \ pcι Rooc II x— SO 3 M pc ' 3 » x _s — ci Roocr ROOC II ROOC X s __ci HO— Y— SO,M Base ROOC ROOC -S0 3 M ROOC and other chlorinating agents (e g , thionyl chloride, phosphorus trichloride, phosphorous oxychloπde) may be used In addition, the reaction between the sulfonyl chloride and the sulfophenol may be carried out in water or an inert organic solvent, and the base used may be an alkali metal hydroxide or a tertiary amine Such suitable compounds are disclosed in U S Patent No 3,734,874 Optionally, the polycondensation reaction may be carried out in the presence of one or more ofthe following (d) an unsaturated mono- or dicarboxyhc acid, and, (e) a difunctional hydroxycarboxyhc acid having one -CH 2 -OH group, an aminocarboxyhc acid having one -NRH group, an amino alcohol having one -CR 2 -CH and one -NRH group, a diamine having two -NRH groups, or a mixture thereof, wherein each R is hydrogen or a C alkyl group The α, ?-unsaturated acids (d) are described by the following structure R— CH=CH — R 1 wherein R is H, alkylcarboxy, or arylcarboxy and R 1 is carboxv or arylcarboxy Polymers derived from the above components can be used in combination with polymers derived from other components and/or in combination with other ethylenically unsaturated comonomers (e g , acrylic acid, acrvlamide, butyl acrylate, diacetone acrvlamide) The comonomers can be from 1 -75 parts by weight, preferably 5-25 parts by weight α,/?-unsaturated acids Advantageous difunctional components which are aminoalchohols include aromatic, aliphatic heterocvc c and other types as in regard to component (e) Specific examples include 5-amιnopentanol- l , 4-amιnomethvlcyclo- hexanemethanol, 5-amιno-2-ethyl-pentanol-l , 2-(4-β-hydroxyethoxyphenyl)- l - aminoethane 3-amιno-2,2-dιmethylpropanol hydroxyethylamine, etc GeneralK these a inoalcohols contain from 2 to 20 carbon atoms, one-NRH group and one -CR 2 -OH group Such difunctional monomer components which are aminocarboxy c acids include aromatic, aliphatic, heterocy c, and other types as in regard to component (c) and include lactams Specific examples include 6-amιnocaproιc acid, its lactam known as caprolactam, omegaaminoundecanoic acid, 3-amιno-2- dimethylpropionic acid, 4-(β-amιnoethyl)benzoιc acid, 2-(β- amιnopropoxy)benzoιc acid, 4-amιnomethylcyclohexanecarboxyhc acid, 2-(β- amιnopropoxy)cyclohexanecarboxylιc acid, etc Generally these compounds contain from 2 to 20 carbon atoms Examples of such difunctional monomer component (e) which are diamines in clu d e ethyl en edi amin e , h ex am et h yl enedi amin e , 2 , 2 , 4 - tπmethylhexamethylenediamine, 4-oxaheptane- 1 ,7-dιamιne, 4,7-dιoxadecane- 1, 10- diamine, 1 ,4-cyclohexanebιsmethylamιne, 1,3-cycloheptamethylene-dιamιne dodecamethylenediamine, etc Greater dissipatabi ty is achieved when the difunctional sulfo-monomer constitutes from about 6 mole percent to about 25 mole percent out of a total of 200 mole percent of (a), (b), (c), (d), and any (e) components ofthe polyester or polyesteramide The total of 200 mole percent can also be referred to as 200 mole parts Any of the above-identified difunctional monomers generally contain hydrocarbon moieties having from 1 to about 40 carbon atoms in addition to their two functional groups, but they may in general also contain up to six nonfunctional groups such as -O-, -S-, -SO 2 -, -SO 2 -O-, etc For example, the poly(ethylene glycol) monomer used may contain from 1 to about 19 oxy groups, such as -O- groups In a preferred embodiment, the ionomer is one ofthe sulfonated polyesters sold by Eastman Chemical Company, Kingsport, TN (hereafter "Eastman" ) which are water dispersible, linear or branched polyesters formed by the polycondensation of glycols with dicarboxyhc acids, some of which contain sodiosulfo groups Sulfopolyester hybrids may also be employed which are formed by the in situ polymerization of vinyl and/or acrylic monomers in water dispersions of SULFOPOLYESTER Such Eastman sulfonated polvesters may be purchased from Eastman under nos AQ1045, AQ1350, AQ 1950, AQ 14000, AQ35S, AQ38S, AQ55S and EASTEK 1300 The sulfonated polyesters and copolymers thereof may range from about 10 to about 90 weight percent, more preferably, about 60 to 80 weight percent, most preferably about 70 weight percent of the total composition The polar carrier may range from about 10 to about 90 weight percent, more preferably, about 20 to about 40 weight percent, most preferably, about 30 weight percent of the total composition. The remainder ofthe composition may comprise one or more ofthe other additives described herein Compositions comprising branched sulfonated polyesters tend to give clear, tacky and flexible films Compositions comprising linear polyesters tend to give clear or white, tack-free, flexible films B. Acrylic Acid Polymers and Copolymers Other lonomers include acrylic acid polymers and copolymers and salts thereof Such polymers and copolymers are described in U S Patent Nos 5,821,294, 5,717,015, 5,719,244, 5,670,566, 5,618,876, 5,532,300, 5,530,056, 5,519,072, 5,371, 133, 5,319,020, 5,037,700, 4,713,263, 4,696,951 , 4,692,366, 4,617,343, 4,948,822, and 4,278,578 The invention relates to compositions comprising the acrylic acid polymers and copolymers thereof described in these patents together with a polar carrier as described herein as well as the adhesive compositions described in these patents (comprising the acrylic acid polymers and copolymers thereof) together with the polar carrier Specific examples of such acrylic acid copolymers include ethylene acrylic acid copolymer and the ammonium (MICHEM 4983 P) and sodium (MICHEM 48525P) salts thereof available from Michelman Incorporated, Cincinnati OH A further example is vinyl acetate acrylic copolymers (e g Rovace HP3442) available from Rohm and Hass, Philadelphia, PA The acrv c acid polymers and copolymers may range from about 10 to about 90 weight percent, more preferably, about 40 to 80 weight percent, most preferably about 50-70 weight percent ofthe total composition The polar carrier may range from about 10 to about 90 weight percent, more preferably, about 10 to about 40 weight percent, most preferably, about 30 weight percent ofthe total composition The remainder ofthe composition may comprise one or more ofthe other additives described herein Compositions comprising ethylene acrylic acid copolymers and a polar carrier tend to give clear, colorless, tack-free films with very good adhesion that heat in well under one second when exposed to RF Vinyl acetate acrylic copolymer compositions tend to give clear, colorless, flexible but very tacky films with very good adhesion that heat in well under one second when exposed to RF C. Starch/Polysaccharide Derivatives Other lonomers include starch and polysacchaπde derivatives such as polysulfonated or polysulfated derivatives, including dextran sulfate, pentosan polysulfate, heparin, heparan sulfate, dermatan sulfate, chondroitin sulfate, a proteoglycan and the like Dextran sulfate is available from Sigma Chemical Corporation, St Louis, MO, with molecular weights of 10,000, 8,000 and 5,000 Examples of other ionic polysaccharides include carrageenan, chitosan, xanthan gum, etc Phosphorylated starch as disclosed in U S 5,329,004 maybe emploved as a susceptor The starch/polysacchaπde derivatives may range from about 10 to about 90 weight percent, more preferably, about 60 to 80 weight percent, most preferably about 70 weight percent of the total composition The polar carrier may range from about 10 to about 90 weight percent, more preferably, about 20 to about 40 weight percent, most preferably, about 30 weight percent ofthe total composition The remainder ofthe composition may comprise one or more ofthe other additives described herein D. Proteins Other lonomers include proteins such as gelatin, soy protein casein, etc Gelatin is the purified protein derived from the selective hydrolysis if collagen Collagen is the principal organic component of the bones and skin of mammals Common raw materials include bones, cattle hides and pigskins Gelatins are classified as either acid type (A type) or limed (B type) according to the process by which they are made Particular examples of gelatins include KNOX gelatin as well as types P, D, D-I, LB, LM and K, available from PB Gelatins See also the gelatin described in U S Patent 5,877,287 In a preferred embodiment, the gelatin is 45Y56-853-3V0-6CS, available from Eastman Gelatin, Peabody, MA In a preferred embodiment, the pH of the gelatin is raised or lowered in order to enhance the lonomeπc character ofthe gelatin The pH may be raised by the addition of aqueous base to an aqueous solution or suspension ofthe gelatin Examples of suitable bases include alkali metal hydroxides, alkali metal carbonates and bicarbonates, alkali metal acetates, ammonia, amino compounds such as methylamine, dimethylamine, tπmethylamine, tπethylamine, and the like Alternatively, a basic buffer solution may be added, e g a solution comprising 2- amιno-2-methyl- 1 -propanol, or a glycine buffer at pH 9 4 and 10 4, each of which is available from Sigma Chemical Corporation, St Louis, MO Other buffers include 0 01 borax (pH 9 2), TRIS (pH 7-9 1 depending on concentration), 0 05 M carbonate (pH 9 93), and 0 05 M tπsodium phosphate (pH 12) See "The Chemist's Companion," A J Gordon and R A Ford, John Wiley & Sons, New York, N Y , 1972 The pH may be lowered by the addition of an acid such as HCl, HBr, H 2 SO 4 , H 3 PO 4 , or an organic acid such as C M alkanoic acid (e g acetic acid, propionic acid or butyric acid), an arylcarboxvlic acid (e g benzoic acid), or arylsulfonic acid (e g / toluenesulfonic acid) Alternatively, an acidic buffer may be added, e g acetate buffer at pH 4 5, 4 9 and 5 0, citrate buffer at pH 4 8, or a phosphate-citrate buffer at pH 5 0, each of which is available from Sigma Chemical Corporation Other buffers include 0 005 M potassium tetraoxalate (pH 1 7), saturated potassium tartrate (pH 3 6), 0 05 M potassium phthalate (pH 4 0). and 0 05 M sodium succinate (pH 5 3) See "The Chemist's Companion," A J Gordon and R A Ford, John Wiley & Sons, New York, NY, 1972 As discussed in the Examples, it has been discovered unexpectedly that when the pH of the gelatin composition is shifted into the acidic or basic range, the composition exhibits enhanced heating in an RF field compared to the untreated gelatin The best heating occurs when the pH is low Such gelatin compositions give flexible films that attach well to substrates and heat in under one second In a preferred embodiment, the pH of the gelatin may range from about 8 to about 12 In a most preferred embodiment, the pH ofthe gelatin is about 10 In another preferred embodiment, the pH ofthe gelatin may range from about 1 to about 6 In a most preferred embodiment, the pH ofthe gelatin is about 2 The gelatin may range from about 10 to about 90 weight percent, more preferably, about 60 to 80 weight percent, most preferably about 70 weight percent of the total composition The polar carrier may range from about 10 to about 90 weight percent, more preferably, about 20 to about 40 weight percent, most preferably, about 30 weight percent ofthe total composition The remainder of the composition may comprise one or more of the other additives described herein E. Others Other ionomers that may be used in the practice of the invention include sulfonated novolak resins obtained by a process comprising reacting an aromatic compound with a sulfonated agent to form a sulfonated aromatic compound, condensing the sulfonated aromatic compound with a non-sulfonated phenolic compound and an aldehyde or aldehyde precursor to form a sulfonated condensate, and reacting the condensate with a monovalent or divalent metal oxide, hydroxide, carbonic acid, boronic acid or carboxylic acid See U S Patent No 5,098,774 Other lonomers that can be used are lignosulfonates and their sodium salts which are available with different molecular weights and levels of sulfonation from Westvaco, North Charleson, SC ///. The Polar Carrier In a preferred embodiment, the ionomer is combined with a carrier that is a flowable polar compound, such as a polar solvent, having a high dielectric constant, e g e(20°C) > about 10, more preferably, > about 20 It has been unexpectedly discovered that compositions comprising an ionomer and such a carrier heat much more rapidly when exposed to RF energy, even at low levels, compared to when the ionomer or carrier are exposed separately Without being bound by any particular theory, it is believed that upon exposure to RF energy, the polar carrier allows for the migration and/or vibration of protons or metal ions from the ionomer, resulting in the generation of heat Such polar carriers include, but are not limited to, water, dimethylformamide (DMF), dimethylacetamide (DMAC), dimethylsulfoxide (DMSO), tetrahydrofuran (THF), polypropylene carbonates, ketones (such as acetone, acetyl acetone, cyclohexanone, diacetone alcohol, and isophorone), alcohols (such as ethanol, propanol, 2-methyl-l -propanol, and the like) amino alcohols (such as ethanolamine), oxazo dines, polyols, organic acids (such as formic, acetic, propionic, butyric and dimethylol butyric acid and the like), anhydrides (such as acetic anhydride and maleic anhydride), amides (such as formamide, acetamide and propionamide), nitπles (such as acetonitπle and propionitπle), and nitro compounds (such as nitrobenzene, nitroani ne, nitrotoluene, nitroglycerine and any ofthe nitroparaffins) Any polar carrier that can weaken, to some degree, the ionic interaction between the anion and cation of the ionic susceptor, even if the susceptor component is a non-ionic compound, may be utilized in the present invention Examples of polyols that may be used as a polar carrier include glycols such as diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, thioethylene glycol, and pentaethylene, hexaethylene, heptaethylene, octaethylene, nonaethylene, and decaethylene glycols, and mixtures thereof, as well as aliphatic, alicyclic, and aralkyl glycols Particular examples of these glycols include ethylene glycol, 1 ,2-propylene glycol, 1 ,3-propanediol, 2,4-dimethyl-2- ethylhexane- 1 ,3, diol, 2, 2-dimethyl- 1 ,3-propanediol, 2-ethyl-2-butyl- l ,3- propanediol, 2-ethyl-2-isobutyl- 1 ,3-propanediol, 1,3-butanediol, 1 ,4-butanediol, 1 ,5-pentanediol, 1 ,6-hexanediol, 2,2-4-trimethyl-l ,6-hexanediol, thiodiethanol, 1 , 2-cyclohexanedimethanol , 1 , 3 -cyclohexanedimethanol , 1 ,4- cyclohexanedimethanol, 2,2,4,4-tetramethyl-l ,3-cyclobutanediol; p-xylylenediol Also included are polyethylene glycols, e.g. having weight average molecular weights ranging from about 400 to about 2,000, mixed poly(ethylene)- poly(propylene) glycols having weight average molecular weights ranging up to about 6,000 and containing from about 30 to about 90 weight percent ethylene oxide; the monomethyl, monoethyl and monobutyl ethers of ethylene glycol, propylene glycol and diethylene glycol, the monomethyl and monoethyl ethers of triethylene glycol, the dimethyl and diethyl ethers of diethylene glycol, dipropylene glycol and trimethylene glycol Examples of polyols containing three or more hydroxy groups include glycerin and derivatives of glycerin such as glycerol mono-, di-, and triacetate, or monomethacrylate Also included is polyvinylalcohol, which also functions as an adhesive compound. Polyvinylalcohols of molecular weights 89,000-98,000, 85,000-146,000, 124,000- 186,000, 31,000-50,000, 85,000-146,000, 124,000-186,000, 13,000-23,000, 50,000-85,000, with various levels of hydrolysis, are available from Aldrich Chemical Company The polar carrier may also be an alkanolamine and substituted alkanolamine based on ethanol and isopropanol such as mono-, di- and triethanolamine, mono-, di- and triisopropanolamine, methylethanolamine, dibutylethanolamine, phenyldiethanolamine, dι-(2-ethylhexyl)ethanolamιne, dimethy sopropanolamine, dibutyhsopropanolamine, and the like as well as mixtures thereof N-Alkyl sulfonamides are also useful carriers The present invention is not restricted to the listed carriers, and mixtures of carriers may be utilized, as would be apparent to those of skill in the art Such polar carriers may comprise about 10 to 90 weight percent of the composition In a most preferred embodiment, the polar carrier comprises about 30 weight percent ofthe total composition Preferable high dielectric constant carriers are those that can generate heat without being highly volatile, in order to preserve RF susceptor mobility in the composition Preferred carriers are glycols such as glycerine and N-methyl pyrro done (NMP) NMP has a high dipole moment of 4 09 Debye, which produces a dielectric constant, K, of 32 2 at 25 °C NMP is noncorrosive, biodegradable, and almost odorless NMP has a low order of oral toxicity and is neither a skin irritant nor a sensitizer NMP is also an excellent solvent both for a wide range of organic compounds and polymers, as well as for some inorganic salts In short, it is a very useful medium for dissolving or dispersing susceptors and film formers that are employed in the bonding or adhering of substrates or layers according to the present invention A further preferred high dielectric constant carrier is glycerine Glycerine has a dielectric constant of 42 5 at 25 °C, is noncorrosive, biodegradable, and odorless Glycerine is nontoxic and is neither a skin in itant nor a sensitizer Thus, glycerine is a preferred carrier for consumer products containing adhesives and coatings Glycerine is also an excellent solvent both for a wide range of organic compounds and polymers, as well as for some inorganic salts A suitable susceptor composition according to the present invention comprises a susceptor present in a concentration of from about 10 % to about 50 % and a carrier present in a concentration of from about 1% to about 75% Additionally, another suitable susceptor composition further comprises an adhesive compound or other additive as described herein present in a concentration of from about 10 % to about 35% The susceptor composition can be used to bond or adhere substrates or layers to one another The substrates can include single layers of polyolefins and non-polyolefins, as well as multilayer stacks Such stacks ma> comprise 2, 3, 4, 5 or more layers One or more susceptor compositions, which may be the same or different, mav be between 2 or more layers ofthe multilayer stacks All composition concentrations described herein correspond to weight-weight percentages, unless indicated otherwise IV. Further Additives to the Susceptor Compositions A number of different additives may be added to the susceptor compositions ofthe present invention including the carrier or mobile medium In order to provide uniform heating of a susceptor composition, the susceptors are dissolved, distributed, or dispersed, preferably substantially uniformly in a carrier containing either various polymers and/or solvents or plastisizers Some carriers, such as solvents, plastisizers, or polymers, are utilized for their polar functionality and for their ability to enhance the heating process A. Adhesive/Thermoplastic Additives The adhesive properties of the susceptor composition of the present invention are enhanced by the presence of one or more thermoplastic or adhesive compounds, such as polymers or copolymers, that are blended in the susceptor composition Some of the thermoplastic or adhesive compounds utilized in the present invention include, but are not limited to, polyesters such as a thermoplastic methylol polyester prepared from the reaction of at least one dicarboxyhc acid with a diglycidyl ether, a diglycidyl ester or combination thereof (see U S 5,583, 187) or a cyanoacrylate/polyester adhesive composition (see U S 5,340,873), polyamides, polyurethanes (see U S 5,391,602), polysiloxanes, elastomers, polyvinylpyrrohdone ethylene vinyl acetate copolymers (see U S 4,460,728) vinylpvrrohdone vinyl acetate copolvmers, vinyl ether copolymers (e g polyvinyl methyl ether), polyvinyl alcohol, partially hydiolyzed polyvinyl acetate, copolymers comprising a starch ester (see U S 5,498,224) and starch hydrolysates (see U S 5,827,553), graft copolymer prepared from a vinyl monomer and a polvalkylene oxide polymer, and a hydroxy-containing ester or acid wax (see U S 5,852,080), copolymers comprising a graft copolymer prepared from a vinyl monomer, at least one polyalkylene oxide polymer, a polar wax and other optional ingredients (see U S 5,453, 144), thermoplastic block copolymers comprising an aromatic vinyl copolymer block, a diene polymer or hydrogenated derivative thereof and other additives (see U S 5,723,222), vinyl chloride copolymers, vinylidene chloride copolymers, vinyhdene fluoride copolymers, vinyl pyrro done homo- and copolymers, vinyl pyπdine homo- and copolymers, hydrolyzed polyvinyl alcohol and compositions thereof (see U S 5,434,216), cellulose esters (e g cellulose acetate and starch acetate, see U S 5,360,845) and ethers (e g hydroxypropyl cellulose, methyl cellulose, ethyl cellulose, propyl cellulose and the like, see U S 5,575,840, 5,456,936 and 5,356,963), modified starch ester containing adhesives (see U S 5,360,845), high amylose starch containing adhesive (see U S 5,405,437), poly-alpha olefins, propylene homo- and copolymers, ethylene homo- and copolymers (especially those of vinyl acetate, vinyl alcohol, ethyl- and butyl- acrylate, carbon monoxide, acrylic and methacry c acid, crotonic acid, and maleic anhydride), an alkyl acrylate hot melt adhesive (see U S 4,588,767), a hot melt adhesive comprising an alkyl acrylate and an alpha- olefin (see U S 4,535,140), a hot melt adhesive comprising an ethylene n-butyl acrylate copolymer (see U S 5,331 ,033), a hot melt adhesive comprising a graft copolymer comprising at least one vinyl monomer and at least one polyalkylene oxide polymer (see U S 5,217,798), a vinyl acetate copolymer copolymeπzed with a cyclic ureido compound (see U S 5,208,285), a hydrophilic polycarbodiimide (see U S 5,100,994), a photopolymenzed, pressure sensitive adhesive comprising an alkyl acrylate, a monethylenically unsaturated polar copolymeπzable monomer, ethylene vinylacetate copolymer and a photo initiator (see U S 5,079,047), a hot melt adhesive comprising tackifymg resins, oil diluent -1 1 - and a substantially radial styrene-butadiene block copolymer (U S 4,944 993), an adhesive prepared from the vinyl ester of an alkanoic acid, ethylene a dialkyl maleate, an N-methylol comonomer, and an ethylenically unsaturated mono- or dicarboxyhc acid (see U S 4,91 1 ,960), an adhesive prepared from the vinyl ester of an alkenoic acid, ethylene, a dialkyl maleate, and a monocarboxylic acid (see U S 4,892,917), a hot melt adhesive consisting essentially of an ethylene n-butyl acrylate copolymer (U S 4,874 804), hot melt adhesive compositions prepared from styrene-ethylene-butylene-styrene tπ-block and/or styrene-ethylene-butylene di-block copolymers that are tackified (U S 4,822,653), a hot melt packaging adhesive comprising a ethylene n-butyl acrylate copolymer with n-butyl acrylate (U S 4,816,306), polysacchaπde esters containing acetal and aldehyde groups (U S 4,801 ,699), polysacchaπde aldehyde derivatives (U S 4,788,280), an alkaline adhesive comprising a latex polymer or a halohydπn quaternary ammonium monomer and starch (U S 4,775,706), polymeric fatty acid polyamides (U S 4,419,494), hot melt adhesives comprising resins containing 2- methylstyrene, styrene and a phenol (U S 4,412,030) The present invention is not restricted to the listed adhesive compounds and compositions, as would be apparent to those of skill in the art Such adhesive additives may comprise about 1 to 50 weight percent ofthe composition, more preferably, about 25 weight percent B. Adhesive/Coating Thermoset Additives It is also possible to add a thermoset resin to the susceptor compositions of the present invention Such thermosets are capable of being cross-linked or cured through heat and/or catalysts and include those described in U S Patent No 5, 182, 134, e g epoxies, polyurethanes, curable polyesters, hybrid thermosets, and curable acrylics Others include bismaleimides, silicons, pheno cs, polyamids and polysulfides among others Further examples include maleate resins formed by the reaction of various polyols with maleic anhydride Orthophthahc resins may be used which are formed by the reaction of phthalic anhydride and maleic anhydride or fumaπc anhydride as the dibasic acid Isophtha c resins may also be used which may be formed by reacting isophthahc acid and maleic anhydride Others include the bis-phenol fumaπdes, chlorendic polyester resins vinyl esters, dicyclopentadiene resins, orthotolyl biguanine, the diglycidyl ether formed from bis-phenol A and epichlorohydπn, tπglycidyl isocyanurate thermosetting compositions, bis-phenol A-epichlorohydπn diglycidyl ether cured with phenolic cross-linking agents aliphatic urethane thermosetting compositions such as an unblocked isofijron dnsocyanate-E-caprolactam, BTDA thermosetting compositions which are generally the reaction product of 3 3,4,4-benzophenone tetracarboxy c dianhydπde and a bis-phenol A-epichlorohydπn diglycidyl ether, hybrid thermosetting compositions which are the reaction product of a carboxylated saturated polyester curing agents and bis-phenol A-epichlorohydπn diglycidyl ether, standard bis-phenol A-epichlorohydπn diglycidyl thermosets such as those which are cured from 2-methylιmιdazole, and standard bis-phenol A- epichlorohydπn diglycidyl ether thermosets which are cured with 2- methy midazole and dicyandiamide thermosetting compositions See U S Patent Nos 5,182,134, 5,387,623 Other thermosets and adhesives/coatings that may be added to the susceptor compositions of the invention include a reactive polyurethane prepolymer and 2,2'-dιmorphohnoethyl ether or dι(2,6-dιmethylmorphohnylethyl) ether catalyst (see U S 5,550, 191), a free radical polymerizable acrylic monomer, diazonium salt/activator composition (see U S 4,602,073), a diphenylmethane diisocyanate, a caprolactone tπol, a neopentyl adipate ester diol, and, optionally, at least one polypropylene diol together with a catalyst (U S 5,057,568), an aqueous polyurethane dispersion comprising an isocyanate-terminated polyurethane prepolymer containing carboxylic acid salt groups, and an active hydrogen containing chain extender (U S 4,801,644) The susceptor compositions ofthe present invention may also be combined with a shelf stable thermosetting resin as described in U S 5 739, 184, which is then activated by RF energy to give coatings, e g for wood or paper products This thermosetting resin comprises an epoxy resin, a rosin and an organometalhc -j j - compound in an amount effective to provide improved adhesion to wood or paper substrates Curing agents may also be combined together with the susceptor/thermoset compositions ofthe invention, including melamines such as dialkyl melamines, amides such as dicyandiamide, adipamide, isophthalyl diamide ureas such as ethylene thiourea or guanylurea, azides such as thiosemicarbazide azoles such as guanazole or 3-amιno-l ,2,4-tπazole, and anilines such as dialkylani nes such as dimethyl aniline and diethyl aniline Such thermoset additives may comprise about 1 to 50 weight percent of the composition, more preferably, about 25 weight percent It has also been discovered that thermoset compositions may be activated with only the polar carrier and without a susceptor Thus, the invention also relates to compositions comprising a thermoset and a polar carrier The thermoset may comprise about 60 to 95 weight percent of such a composition The polar carrier may comprise about 5 to 40 weight percent The invention relates as well to methods of bonding, adhering or coating substrates with such thermoset/polar carrier compositions C. Surfactant Additives According to another embodiment of the present invention surfactant additives can be added to the susceptor composition to enhance the ability to draw down the susceptor composition of the present invention onto the layers or substrates to be bonded, adhered or coated Depending on the types of materials that are to be joined or coated, surfactant additives, such as SURFYNOL 104PA (available from Air Products Corporation) and SURFADONE LP 300 (N- dodecyl-2-pyrrohdone, available from International Specialty Products), can be used to wet a variety of substrates such as Mylar and polyethylene (PE) A further plasticizer ιs/?-toluenesulfonamιde, a good plasticizer that also dissolves stannous chloride The present invention is not restricted to the listed surfactant additives, as would be apparent to those of skill in the art Such surfactants may comprise about 0 1 to weight percent ofthe composition D. Plasticizer Additives The susceptor compositions ofthe present invention may further comprise a plasticizer to modify the flexibility ofthe adhesive or coating Examples of such plasticizers include, but are not limited to acetyl tπbutyl citrate, butyl benzyl phthalate, butyl phthalyl butyl glycolate, dibutyl phthalate, dibutyl sebacate diethyl phthalate, diethylene glycol dibenzoate, dipropylene glycol, dipropylene glycol dibenzoate, ethyl phthalyl ethyl glycolate, ethyl-/?-toluene sulfonamide, hexylene glycol, methyl phthalyl ethyl glycolate, polyoxyethylene aryl ester tπbutoxyethyl phthalate, triethylene glycol polyester of benzoic acid and phthalic acid, glycerin, or mixtures thereof Such plasticizers may comprise about 1 to 40 weight percent ofthe composition E. Tackifiers The tackiness ofthe compositions ofthe invention may be increased by the addition of a suitable tackifier, e g one or more of hydrogenated aromatic petroleum resins, hydrogenated aliphatic petroleum resins, and hydrogenated terpene resins (see U S 5,418,052), coumarone-indene, ester gum, gum rosin, hydrogenated rosin, phenolic modified hydrocarbon resins, rosin esters, tall oil rosins, terpene phenolic, terpene resins, toluene sulfonamide-formaldehyde resin, wood rosin (see U S 5,442,001), distilled rosin, dimeπzed rosin, maleated rosin, polymerized rosin (see U S 5,532,306) Other tackifiers and modifiers, include (but are not limited to) styrene and alpha methyl styrene resins, glycerol and pentaenthritol esters, etc Particular tackifiers include Wingtack 95 from Goodyear, Hercuhn D and Piccolyte C from Hercules, Eastotac HI 00 from Eastman, and ECR 149B or ECR 179A from Exxon Chemical (see U S 5,559 165) Such tackifiers may comprise about 1 to 25 weight percent ofthe composition F. Fillers A number of different fillers may be added to the susceptor compositions of the invention including, but not limited to cellulose, bentonite, calcium carbonate calcium silicate, clay, mica silica, talc, alumina, glass beads, fibers and the like Such fillers may comprise about 0 to 40 weight percent of the composition G Stabilizers and Antioxidants Stabilizers and antioxidants may be added to the susceptor compositions of the invention in amounts effective to achieve the intended result Included amoung such stabilizers include high molecular weight hindered phenols and multifunctional phenols such as sulfur and phosphorous-containing phenols Representative hindered phenols include l ,3,5-tπmethyl-2,4,6-tπs(3,5-dι-tert- butyl-4-hydroxybenzyl)benzene, pentaerythπtol tetrakιs-3-(3,5-dι-tert-butyl-4- hydroxypropionate, n-octadecyl-3,5-dι-tert-butyl-4-hydroxyphenyl)propιonate, 4,4'-methylenebιs(2,6-dι-tert-butylphenol), 4,4'-thιobιs (6-tert-butyl-o-cresol), 2,6- di-tert-butylphenol, 6-(4-hydroxyphenoxy)-2,4-bιs(n-octylthιo)-l,3,5-tnazιne, di- n-octadecyl-3,5-dι-tert-butyl-4-hydroxybenzylphosphonate, 2-(n-octylthιo)ethyl- 3,5-dι-tert-butyl-4-hydroxybenzoate, and sorbitol hexa[3-(3,5-dι-tert-butyl-4- hydroxylphenyl)propιonate (see U S 5,574,076) Such stabilizers and antioxidants may comprise about 0 01 to 5 weight percent ofthe composition H Other Additives According to another embodiment ofthe present invention, other types of additives to the susceptor composition may include flow aids, heat and UV stabihzers, coupling agents waxes, pigments and other organic compounds For example, in some instances, waxes can facilitate lower melt temperatures Waxes that can be utilized include, but are not limited to, Bees wax (SYNCHROWAX BB4), Candelilla wax, CARBOWAX 3350 (available from Union Carbide Corporation), Carnauba wax, and C ASTORWAX NF Other waxes include N-(2- hydroxyethyl)-2,2'-ethylene-bιs-stearamιde, stearamide, 12-hydroxystearamιde wax, hydrogenated castor oil, oxidized synthetic waxes, poly( ethylene oxide) having a molar average molecular weight of above about 1000 and functionalized synthetic waxes such as carbonyl containing Escomer H 101 from Exxon (see U S 5,532,306) Other additives include elastomers such as those described in U S 5,506,298, 5,739,184, 5, 169,890, 5,039,744, 4,761 ,198 may be used, including styrene butadiene rubber, polybutadiene rubber, rubber, nitrile rubbers, butyl rubber and halogenated butyl rubber When the compositions are applied and activated as coatings, they may further comprise one or more additives to impart color to the composition Such additive include, without limitation, titanium dioxide, iron oxide pigments, carbon black and organic pigments such as isoindoline yellow The present invention is not restricted to the listed additives, as would be apparent to those of skill in the art Such other additives may comprise about 1 to 25 weight percent ofthe composition V Applying the Susceptor Compositions to Substrates The compositions ofthe invention may be formulated to be applied as a liquid at room temperature, hot melt, or powder Liquid compositions may be solvent borne or water-borne The liquid applied compositions may be applied as a liquid at room temperature and dried down to give the desired coating The liquid applied coating may be applied to a substrate by any conventional method including spraying, ink-jet, brushing, rolling, gravure printing, dripping and the like Methods of actively drying down liquid compositions include but are not limited to conventional oven drying, forced air, heat lamps, microwave heating, RF heating or various combinations of these or other methods When a liquid composition is dried down, it loses some or all of its volatiles RF drying of a liquid applied composition may be accomplished by applying RF energy across the composition in order to generate sufficient heat within the liquid to facilitate or enhance the evaporative loss of water or solvent(s) The RF energy can be applied across the liquid at constant, intermittent, or gradient intensities to achieve the desired rate and degree of drying Similarly, other methods of drying may be applied at constant, intermittent or gradient intensities to achieve the desired drying result Hot melt applied systems are applied in their molten state at an elevated temperature and then cooled to yield the desired solid coating The hot melt compositions can be heated to a molten state by various methods including but not limited to conventional melt tanks, microwave heating and RF heating Once the hot melt composition is melted, it may be applied in a variety of different types of hot melt coatings, including but not limited to spirals and beads, hot blown, slot coat, and co-extrusion After application, the molten hot melt composition can be passively or actively cooled to return to its solid form Active cooling may be accomplished by blowing cool air across the applied material, or by allowing the substrate to make contact with a heat-sink surface Powdered applied systems are applied in their "fine" particle state (1-20 μm) by electrostatic spray or gun The applied layer is activated by RF energy as in liquid or hot-melt systems Once dried and/or cooled, the substrate may be stored until activation of the composition is desired Many ofthe applied compositions ofthe invention are substantially non-tacky and may be applied to a substrate which is then rolled up Upon unrolling and activating, the substrate may be adhered to one or more other substrates Those compositions that are tacky may be activated immediately after being applied and dried if necessary Alternatively, they may be covered with a removable strip or dusted with talc or similar material One aspect of the invention also relates to a method for applying a susceptor composition to a substrate, comprising (1) formulating the susceptor composition as a liquid dispersion, (2) applying the liquid dispersion of the susceptor composition to the substrate, (3) drying the susceptor composition, wherein the drying step includes the step of applying RF energy across the composition, thereby generating heat within the liquid dispersion In a preferred embodiment, one may roll up the substrate after the susceptor composition has dried The susceptor compositions may be applied to any conventional substrates including, without limitation woven and nonwoven substrates such as polyolefins, such as PP and PE webs, non-wovens, films and the like, cellulose substrates prepared from, for example, wood pulp (such as paper, cardboard and the like), cotton fibers (e g textiles such as cloth, sheeting and industrial fabrics), glass, ceramic surfaces, rubber and synthetic polymeric substrates such as polyester or polyolefin substrates prepared from, for example, polypropylene and polyethylene, polyvinyl alcohol, polyhydroxyvalerate butyrate, polylactides, cellulosics, polyamides, polyvinyl chloride, polystyrene, acrylics, synthetic textile products, etc and any combination ofthe aforementioned Other substrates include metal (e g aluminum foil and other metal foils), wood, composites, etc VI. Apparatus For Activating the Various Compositions of the Present Invention Generally, the compositions ofthe present invention may be heated (I e , activated) by any system capable of generating an electromagnetic field of sufficient strength and frequency FIG 4 illustrates a high level block diagram of an RF heating system 400 that is capable of generating an electromagnetic field for activating the compositions ofthe present invention Heating system 400 includes an RF power supply 402 that provides about a 1 kW, 1 to 15 MHz, RF signal 404 to a heat station 406 Heating system 400 also includes an inductor 408 that is coupled to RF power supply 402 through heat station 406 Generally heat station 406 includes a capacitor connected either in series with or parallel to inductor 408 RF signal 404 provided to heat station 406 by RF power supply 402 creates an alternating current flowing through inductor 408, which creates an electromagnetic field Heating of a sample 410, which is or includes a composition of the present invention, occurs when sample 410 is placed in proximity to inductor 408 The best heating takes place when sample 410 is placed near the proximal (or "terminal") end 41 1 of inductor 408, and little or no heating occurs when sample 410 is placed at the distal (or "turn") end 412 of inductor 408 Further, there is a heating gradient from terminal end 41 1 to turn end 412 In theory and without limitation, the best heating occurs at the terminal end 41 1 because it is believed that the intensity ofthe electric field component of the electromagnetic field at terminal end 41 1 is greater than at the distal end 412 FIG 5 illustrates a high level block diagram of another embodiment of a heating system 500 that is capable of generating an electromagnetic field for activating the compositions ofthe present invention Heating system 500 includes an alternating voltage generator 502 and a probe 504, which is connected to an output terminal 501 of voltage generator 502 Voltage generator 502 alternately positively charges and negatively charges probe 504, thereby creating an electromagnetic field 506 centered at probe 504 Heating can occur when sample 410 is placed in proximity to probe 504 How quickly and how much heating occurs depends on the sample itself, the strength ofthe electromagnetic field at the sample, and the frequency of the alternating voltage 509 produced by voltage generator 502 Generally, probe 504 is a conductive material, such as, but not limited to copper, aluminum, or stainless steel Generally, probe 504 can have a variety of shapes, including cylindrical, square, rectangular, triangular, etc Preferably, probe 504 is square or rectangular Probe 504 can be hollow or solid, preferably hollow Generally, probe 504 can be straight or non-straight, such as curved The preferred characteristics of probe 504 ultimately depends on the application that it is being used for In yet another embodiment, which is illustrated in FIG 6, heating system 500 includes at least two probes 602 and 604 for activating the compositions of the present invention Probe 602 is connected to output terminal 610, and probe 604 is connected to output terminal 612 Like probe 504, probes 602 and 604 are made from conductive materials as discussed above Probes 602 and 604 can have a variety of shapes For example, they can be either straight or curved Preferably, at least a portion of probe 602 is parallel to a portion of probe 604, although not a required In the system shown in FIG 6, probe 602 has a net positive charge when probe 604 has a net negative charge, and probe 602 has a net negative charge when probe 604 has a net positive charge When probes 602 and 604 are oppositely charged, a strong electromagnetic field 606 is present between the probes Thus, sample 410 is preferably heated by placing it in a region above (or equivalently below) the region between probe 602 and probe 604, as illustrated in FIG 7A and 7B This region is referred to as an activation region Preferably, an insulating layer 702 (see FIG 7A) is placed between sample 410 and probes 602 and 604, although not a required Generally, the vertical distance between sample 410 and probes 602 and 604 ranges from about 01 to 2 inches, more preferably from about 02 to 1 inch, and most preferably from about 025 to 185 inches Sample 410 can also be heated by placing it between probes 602 and 604 Generally, The center to center distance between probes 602 and 604 ranges from about 0 1 to 3 inches, more preferably from about 0 2 to 2 inches, and most preferably from about 0.25 to 0.75 inches. Additionally, in general, the height and width of a rectangular probe, or the diameter for a cylindrical probe, ranges between about 0 02 and 0.5 inches, and the length generally ranges from about 0.25 inches to 20 feet An advantage that the two probe system shown in FIG 6 has over the system shown in FIG 4, is that sample 410 heats equally as well at the proximal end of probes 602, 604 as it does at the distal end Consequently, the system of FIG 6 does not experience the heating gradient problem that is encountered with the system of FIG 4 Generally, the compositions ofthe present invention may be activated by a frequency ofthe alternating voltage 509 ranging from about 1 KHz to 5 GHz, more preferably from about 1 MHz to 80 MHz and most preferably from about 10 to 15 MHz The peak to peak voltage between probes 602 and 604 generally ranges from 1 to 15 kilo volts (kV) Generally, the duration of RF energy application to the sample 410 (also referred to as dwell time), for most applications, ranges from about 100 milliseconds to 30 seconds However, there are some applications where the dwell time greatly exceeds 30 seconds In the case of a composition comprising a thermoset resin, the dwell time ranges from about 1 second to 20 minutes, preferably from about 1 to 10 minutes, and most preferably from about 2 5 to 5 0 minutes to initiate cross linking reactιons(s) leading to a high degree of thermoset character FIG 8 illustrates one embodiment of alternating voltage supply 502 The invention, however, is not limited to this or any particular voltage supply, since any system capable of generating a strong enough electromagnetic field could be utilized to activate the compositions ofthe present invention In one embodiment, voltage supply 502 includes direct current (DC) voltage source 802 that is connected to a broadband amplifier 806 through DC power rail 804 The function of DC voltage source 802 is to provide a DC voltage to broadband amplifier 806 The DC voltage produced by DC voltage source 802 can range from 0 volts to 200 volts The magnitude ofthe voltage provided to broadband amplifier 806 is dependent upon an output signal 815 from a main controller 814 Output signal 815 of main controller 814 can be controlled manually by a user 821 through user interface 820, or automatically by a production line control system 822 Broadband amplifier 806 amplifies a low level RF signal 817 generated by frequency controller 816, and thus generates a high level RF power signal 808 Preferably, the frequency of RF signal 817 ranges between 10 MHz and 15 MHz RF signal 808 is passed through a power sensor 810 and provided to an impedance matching circuit 812 (also referred to herein as "heat station") through an RG393 50 ohm cable 81 1 Upon RF signal 808 being inputted into impedance matching circuit 812, an electromagnetic field 606 is generated at the probes 602 and 604 This electromagnetic field is used to heat the compositions of the present invention While RF signal 808 is applied to impedance matching circuit 812, power sensor 810 continuously feeds a reflected power signal 832 to frequency controller 816 and main controller 814 Power sensor 810 also continuously feeds a forward power signal to main controller 814 Reflected power signal 832 represents the amount of reflected power and forward power signal 830 represents the amount of forward power Frequency controller 816 uses reflected power signal 832 to continually adjust the frequency of RF signal 817 so as to minimize the amount of reflected power Main controller 814 uses forward power signal 830 and reflected power signal 832 to maintain the power level set by user 821 through user interface 820 or set by production line control system 822 Main controller maintains the correct power level by adjusting the level of DC voltage supplied by DC voltage source 802 and by adjusting the output level of RF signal 817 generated by frequency controller 816 As sample 410 changes during a heating process, the impedance on the probes 602 and 604 change, which causes a change in the forward and reflected power Frequency controller 816 will detect this change in reflected power because it is receiving reflected power signal 832 from power sensor 810 Frequency controller 816 changes the frequency of RF signal 817 so as to minimize reflected power, thereby achieving an optimum impedance match and insuring a repetitive power transfer from heating system 800 to sample 410 DC voltage source 802, sensor 810, frequency controller 416, and main controller 814 are further described in U S Patent Application No 09/1 13,518, entitled, "RF Power Supply," which is incorporated herein by reference in its entirety A broadband amplifier suitable for use in heating system 800 is described in U S Patent Application No (Attorney Docket No 171 1 0100000), filed March 17, 1999, entitled, "High Frequency Power Amplifier " which is incorporated in its entirety herein by reference FIG 9 is a flow chart illustrating a process for heating a composition according to the present invention using heating system 800 The process begins with step 902 when user 821 or production line control system 822 sends a "heat- on" signal to the main controller 814 Upon receiving the "heat-on" signal, main controller 814 begins an initial tunning process for determining the frequency of RF signal 817 that produces the minimum amount of reflected power The initial tuning process encompasses steps 904-908 In step 904, main controller 814 directs DC voltage source 802 to output a "tune" voltage The "tune" voltage is the lowest voltage level that can provide a sufficient signal to measure the reflected power over a range of frequencies The objective is to consume the least amount of energy during the initial tunning process Typically, the "tune" voltage level is 10% ofthe full scale voltage, where the full scale voltage is the voltage at which the composition is intended to be heated After step 904, control passes to step 906 In step 906, heating system 800 performs course tunning That is, heating system 800 determines a course estimate (i e , rough estimate) of the frequency that produces the minimum reflected power Hereafter this frequency shall be referred to as the resonant frequency The course estimate ofthe resonant frequency can be determined by sampling reflected power over a first predetermined frequency range After step 906, control passes to step 908 In step 908, the heating system 800 performs fine tunning That is, the heating system 800 determines a fine estimate (i e , more precise estimate) ofthe resonant frequency The fine estimate can be determined by sampling the reflected power over a second frequency range, which includes the course estimate ofthe resonant frequency After step 908, control passes to steps 910 and 912 in parallel In step 910, main controller 814 ramps (i e , rapidly increases) the voltage output by the DC voltage source 802 such that within approximately 30 milliseconds the voltage increases from the "tuning" voltage level to approximately the full scale voltage level In step 912, the heating system 800 continuously tracks the resonant frequency until a power off indication is received The methods for course tuning, fine tuning, and tracking resonant frequency are described in U S Patent Application No 09/1 13,518 FIG 10 further illustrates one embodiment of impedance matching circuit 812 Impedance matching circuit 812 is used to match the impedance of 50 ohms on the input to the variable impedance ofthe probes 602 and 604 and sample 410 The impedance ofthe probes 602 and 604 and sample 410 is typically in the order of 200 to 500 ohms The impedance ofthe sample has an equivalent circuit of a resistance between 500 Ohms and 50 Kilo Ohms in parallel with a 0 1 picofarad capacitor Circuit 812 includes a connector 1001, two capacitors 1002 and 1004, and an inductor 1006 Capacitor 1002 is a variable capacitor, which is adjustable from 10 to 50 picofarades (pf) to achieve impedance match to the varying impedance of probes 602 and 604 and sample 410 The capacitance of capacitor 1004 is preferably 100 pf, and the inductance of inductor 1006 is preferably 1 0 micro henries (μH) Capacitor 1004 and inductor 1006 form a parallel resonance circuit that will resonate typically at a frequency between 12 5 and 14 5 MHz Capacitor 1004 and inductor 1006 are water cooled with a flow rate of approximately half a gallon per minute Probe 602 is connected to a node 1020 of circuit 812, and probe 604 is connected to a node 1022 of circuit 812 The high power RF input 411 (typically less than 1 kilowatt) from a 50 ohm source generator is connected to connector 1001 A process for setting the capacitance of variable capacitor 1002 will now be described The process begins by applying a low level RF signal (typically 10 watts) to input 1001 of circuit 812 The frequency of the applied RF signal is adjusted until the amount of reflected power is minimized The capacitance of capacitor 1002 is then adjusted to optimize the reflected power minima To achieve the least amount of reflected power that is practical to achieve, which is about two percent reflected power (or 1 25 voltage standing wave ratio (VSWR)), the frequency ofthe applied RF signal and the capacitance of capacitor 1002 are adjusted in an iterative process Once the process is completed, sample 410 is placed in proximity to probes 602 and 604 At this point it may be necessary to adjust the frequency of operation and capacitor 1002 in order to achieve an optimum reflected power Once optimum reflected power is achieved, the power level ofthe input RF signal is increased As the input RF power level is increased the resonant frequency ofthe matching circuit and probes 602 and 604 and sample 410 will change requiring a change of operating frequency to continue to minimize the reflected power VII. Method of Bonding Substrates The compositions ofthe present invention may be employed in a variety of bonding methods, including but not limited to adhesive bonding, thermal bonding and mechanical bonding Adhesive bonding is accomplished when a susceptor composition is interposed between two substrates that are to be joined (adherands) and activated by RF energy to undergo adhesive attachment to each ofthe adherands In the case of thermoplastic adhesive compositions such as hot melts, RF energy causes the composition to melt and wet-out onto adherands that are in close contact Upon cooling, the composition returns to a solid state with sufficient cohesive strength and adhesion to each ofthe adherands to form a good bond The degree of heating and melting ofthe adhesive composition is controlled by the intensity and duration ofthe applied RF energy and the formulation ofthe adhesive composition Such control is required to prevent undesired results stemming from under-heating or over-heating the adhesive composition For example, under-heating can result in a weak bond due to insufficient wet-out of the adhesive onto the adherands Also, over-heating can result in undesirable bond, with thermal distortion or destruction ofthe adherands, as well as thermal degradation ofthe thermoplastic composition In the case of thermoset adhesive compositions, RF energy causes the composition to become cured, resulting in sufficient increase in cohesive strength and adhesion to adherands to form a strong bond As in the case of thermoplastic compositions, the degree of heating and curing of thermoset compositions is controlled by the intensity and duration of the applied RF energy Such control is required to prevent undesired results from under-heating or over-heating For example, under-heating can result in a weak bond due to insufficient cross-linking Over-heating can cause effects such as thermal distortion or destruction of the adherands, as well as thermal degradation and excessive shrinkage of the thermosetting composition Thermal bonding is accomplished when the composition is used to generate sufficient heat to cause one or more adherands to become thermally fused to each other One example of thermal bonding involves saturating a porous thermoplastic material, such as a non-woven polypropylene web, with an RF- heatable composition, and then interposing the saturated web of material between two adherands and RF-heating the composition to cause the saturated web and adjacent adherands to melt and fuse to each other Another example of thermal bonding involves saturating a porous, first thermoplastic adherand with an RF-heatable composition, and then placing the first adherand against a second thermoplastic adherand and RF-heating the composition to cause the first and second adherands to melt and fuse together FIG 1 1 shows a method of bonding polyolefin and non-polyolefin materials using a composition that is activated in the presence of RF energy according to the present invention In step 1 102, adherands that are to be bonded or adhered are chosen Once the materials or layers are chosen, an appropriate composition is prepared in step 1 104 For example, if nonwoven PP layers are chosen to be bonded, a susceptor, which includes an ionomer as described herein, is combined with a polar carrier The type of composition may depend on whether a transparent, translucent, or lightly colored adhesive obtained by the method ofthe present invention is needed for a particular application After the composition is prepared in step 1 104, control can pass to step 1 106, 1 109, or 1 1 10 In step 1 106, a second carrier, such as an insoluble porous carrier (e g , nonwoven PP), is saturated with the prepared composition In step 1 108, the saturated insoluble porous carrier is then placed in between the layers chosen to be bonded RF energy is applied in step 1 120 T he RF energy applied in step 1 120 can be applied for 100 milliseconds to several minutes The application of RF energy allows for the precision heating ofthe layers to be bonded, without the unwanted side effects of non-uniform bonding, or damage to the bonded layers In step 1 1 10, one or both ofthe layers to be bonded are coated with the composition In step 1 1 12, the composition is allowed to dry or the hot melt to congeal depending on the type of composition created Alternatively, a heat source (e g an oven or lamp) and fan may be used to dry the coating or RF energy may be applied to drive off any water or other solvents According to step 1 1 14, the layers to be bonded are placed together, such that the coated surfaces are in contact Uniform pressure placed on the contacted layers helps enhance the bonding or adhesion process activated by the applied RF energy (step 1 120) Such uniform pressure may be applied while the composition is being activated or immediately thereafter by use of conventional nip rollers In step 1 109, a film of the composition is created Such a film can be created according to film making processes well known in the art The film made in step 1109 can then be sandwiched between the two materials to be bonded in step 1 11 1 RF power is then applied in accordance with step 1120 In a further embodiment, two or more adherands m?y be bonded or adhered by a process comprising applying a first composition onto a first adherand, applying a second composition onto a second adherand, contacting the first composition with the second composition, applying RF energy to the first and second compositions to heat the compositions, thereby causing the first and second adherands to become adhered or bonded, wherein one ofthe compositions comprises a susceptor and the other of the susceptors is a polar carrier, and the susceptor and/or the carrier are present in amounts effective to allow the first and second compositions to be heated by RF energy In this embodiment ofthe invention, the susceptor and carrier components of the composition are applied separately to the adherands prior to placing the adherands together FIG 52 shows a susceptor-coated adherand 5201 assembled to an adherand 5203 coated with the polar carrier After coating one or both of the adherands, one may apply a temporary release liner 5205 to the coated side to allow the coated adherand to be rolled up or stacked Alternatively, one may dry one or both coatings After nipping the two coated adherands in the assembly stage, the assembly is passed through an RF field 5207 for activation The RF energy causes the susceptor and carrier to heat with the resulting adhesion between the two adherands The final nip rollers 5209 press and bonds the two adherands, while cooling the bond line FIG 53 shows the replacement of the pre-apphed polar carrier on the adherand with a polar carrier spray coated onto the adherand just prior to the assembly nip rollers 5206 A polar carrier is applied (e g sprayed or otherwise as described herein) by a spray applicator 5302 onto adherand 5201 When assembled with the susceptor coated adherand 5203 and exposed to RF energy, the interfaced composition activates to form a bond VIII. Additional Probe Embodiments Additional embodiments of probes 602 and 604 are described below with reference to FIGs 12 to 17 These additional embodiments are in no way limiting and merely provide additional examples of possible configurations ofthe probes In FIG 12, probes 602 and 604 are each curvilinear and oppositely charged In this particular example, probes 602 and 604 are sinusoidally or "S" shaped, but any similar arrangement is possible Probes 602 and 604 are made from conductive materials, as described above, preferably, but not limited to, copper, aluminum, or stainless steel Probe 602 includes a proximal region 1206, and activation region 1208 and a distal region 1210 Similarly, probe 604 includes a proximal region 1212, an activation region 1214, and a distal region 1216 In proximal regions 1206 and 1212, probes 602 and 604 are spaced apart in order to prevent arcing The amount of spacing depends on the size of probes 602 and 604, and in one example, probes of 0 125 inch square cross-section should be spaced at least 1 1875 inches apart Similarly, distal regions 1210 and 1216 are spaced apart to prevent arcing, the amount of such spacing is similarly dependent upon the size ofthe probes In activation regions 1208 and 1214, probes 602 and 604 are in proximity to one another in order to create an electromagnetic field between the probes How close probes 602 and 604 must be to one another again depends on the size ofthe probes and the magnitude of the charge on them In one example, probes 602 and 604 have about a 0 125 inch square cross-section and preferably spaced between 0 25 and 0 75 inches apart It is preferable the space between probes 602 and 604 remains substantially equal throughout the activation region, but it is not necessary An activation zone 1222 is defined in activation regions 1208 and 1214 between an outermost end 1218 of probe 602 and an outermost end 1220 of probe 604 Activation zone 1222 is indicated in dashed lines in FIG 12 Activation zone 1222 defines the area of sample 410 that can be heated/activated by the system when the substrates being joined are moving in the direction indicated If the substrates are stationary with respect to the probes, the activation zone is defined by the area in between the probes In another embodiment, probes 602 and 604 may be repeated in order to provide a larger activation zone Such an arrangement is shown in FIGs 13 A and 13B For example, in FIG 13 A, a pattern of one probe 602 and two probes 604 is provided This arrangement may include any number of probes 602 and 604, as long as oppositely charged probes are placed next to one another This arrangement works equally well with multiple sets of curvilinear probes, as shown in FIG 13B FIG 14 shows another embodiment of a probe system for activating a multi-sided sample 1402 In this embodiment, sample 1402 is mounted on a block 1404 Sample 1402 may be mounted on any similar device which allows each side of sample 1402 to be exposed to moving probe blocks 1406 This particular example shows a three-sided sample exposed to three moving probe blocks 1406, however, the sample may include more sides and be exposed to an equivalent amount of moving probe blocks Probe blocks 1406 include probes 602 and 604 mounted in an electrically insulating material such as, but not limited to, polytetrafluoroethylene (TEFLON™ ) Probes 602 and 604 are mounted on pressure plates 1408 of probe blocks 1406 In this particular example, three probes are used in each probe block 1406, two negatively charged probes 604 and one positively charged probe 602 However, more or less probes can be used, depending on the size of the probe blocks, as long as adjacent probes are oppositely charged Probes 602 and 604 are coupled to an alternating voltage supply 502, via output terminals 610 and 612 as generally shown in FIG 6 Probe blocks 1406 are moved into proximity of sample 1402 mounted on block 1404, preferably between 0 125 and 0 375 inch, thereby activating the compositions of the present invention, as previously described Alternatively, probe blocks 1406 could be placed at the appropriate interval and block 1404 with sample 1402 could be moved into position to be activated While FIG 14 shows the probe blocks 1406 as having a regular shape, one skilled in the art will recognize that the probe blocks could be any three dimensional shaped object FIG 15 shows another embodiment for activating a multi-sided sample 1502 using a stationary probe system In this embodiment probes 602 and 604 are mounted on multiple sides of a single probe block 1504, similar to the manner in which probes 602 and 604 were mounted in probe blocks 1406, described above In this particular example, probes 602 are mounted on three sides of a generally square probe block 1504, but probes 602 and 604 could be mounted on multiple sides of any polygonal block or three dimensional object Sample 1502 is brought into proximity of probe block 1504 by pressure plates 1506, thereby activating the compositions ofthe present invention, as previously described In this particular example, two negatively charged probes 604 and one positively charged probe 602 are shown on each side of probe block 1504, however, it will be recognized that any number of probes could be utilized, depending on the application, as long as adjacent probes are oppositely charged Probes 602 and 604 are coupled to an alternating voltage source 502 via output terminals 610 and 612, as generally depicted in FIG 6 FIGs 16A and 16B show yet another embodiment of a probe system for activating a sample material including compositions ofthe present invention In FIGs 16A and 16B, sample 1602 is draped over a conveyor rod 1604 and generally moves along the circumference ofthe conveyor rod Conveyor rod 1604 is constructed of electrically non-conductive material A probe system 1606 is disposed in proximity to a portion of the circumference of conveyor rod 1604, e g , 0 02 to 1 5 inches, and more preferably within 0 125 to 0 375 inch and is shaped to conform to the shape of conveyor rod 1604, as best seen in FIG 16B Probe system 1606 includes adjacent, alternately charged probes 602 and 604 for activating sample 1602 Probes 602 and 604 are coupled to an alternating voltage source 502, as generally depicted in FIG 6 The probe systems described above all activate a single side ofthe sample material However, probe systems could be placed on both sides ofthe material in each of the above-described embodiments, provided that the polarity of the probes is such that the electromagnetic fields do not cancel each other out A particular example of an activation system for activating both sides ofthe material is shown in FIG 17 Rather than using a probe system, two oppositely charged conductive plates 1702 (positively charge) and 1704 (negatively charged) are disposed on opposite sides of sample material 1706 Plates 1702 and 1704 are preferably constructed of copper, but may be constructed of any suitable conductive material, such as the aforementioned conductive materials of probes 602 and 604 Sample material 1706 may be stationary or moving when exposed to the activation region between plates 1702 and 1704 Plates 1702 and 1704 are preferably spaced between 0 02 and 24 inches, more preferably between 0 02 and 15 inches, and most preferably between 0 05 and 0 375 inches Plates 1702 and 1704 are coupled to an alternating voltage source 502 via output terminals 610 and 612, as generally depicted in FIG 6 IX. Applicator System for Applying Composition ofthe Present Invention to a Substrate/Adherand FIG 18 illustrates one embodiment of an application system 1800 for applying a composition according to the present invention to an adherand 1810 The manufacturing system includes an applicator 1815 Applicator 1815 applies a hot melt or liquid dispersion or powder ofthe composition 1812 to one side of adherand 1810 Composition 1812 may be applied via a hot melt by applying heat to the composition 1812 so that it reaches its melting point and can be applied to an adherand In a hot melt application heat is applied to the composition 1812 in the applicator 1815, and the composition 1812 is applied to the adherand at a temperature between 200 and 325 degrees Fahrenheit, preferably 250 degrees Fahrenheit Composition 1812 may also be formulated as a liquid dispersion The composition 1812 can then be applied to the adherand at room temperature Once the liquid dispersion composition 1812 is applied to the adherand, the coated material 1810 is passed through a heating system 1820 Heating system 1820 acts to dry the composition 1812 Heating system 1820 can be any conventional heating system, like an oven, or heating system 1820 can be an RF heating system, such as heating system 500 described above Other drying means that may be employed include, for example, a heat lamp with or without a fan to remove volatiles, or microwave heating system Composition 1812 can be applied in powder form by conventional electrostatic gun/spray In one embodiment, the coated adherand 1810 is rolled onto a roller 1830 after composition 1812 is sufficiently dried Alternatively, the coated adherand 1810 can be cut into pieces and stacked The coated susceptor 1810 can be used at a later point in time in the bonding process described above The bonding process can occur anytime within a few seconds up to many months after the adherand 1810 has been coated with composition 1812 X. Systems for Adhering or Bonding Two Adherands FIG 19 illustrates one embodiment of a system for bonding or adhering various adherands or layers The system utilizes RF heating system 400, including power supply 402, cable 404, heat station 406, and coil 408, and clamp 1902 The adherands to be bonded by RF heating 400, shown as layers 1910, pass through or in proximity to coil 408 Layers 1910 can either be coated with a suitable susceptor composition, can sandwich a film made from a susceptor composition or can sandwich an insoluble, porous carrier (such as a thermoplastic carrier web) that is saturated with a susceptor composition as described abo\ e A clamp 1902 provides uniform pressure to the adherands to be bonded or adhered Alternatively, coil 408 can be implemented to provide a uniform pressure to the adherands to be bonded or adhered. Precision bonding or adhering takes place as the layers 1910 are exposed to the electromagnetic field generated when an alternating current flows through coil 408 The electromagnetic field has sufficient RF energy to activate the bonding composition Preferably, layers 1910 are exposed to the electromagnetic field for at least 100 milliseconds to several seconds or minutes In the case of thermoset compositions, in general, longer times are needed, e g from 1 second to several minutes or hours FIGS 20 A and 20B illustrates a static bonding system 2000 for bonding or adhering adherands 2090 and 2092 (see FIG 20B) Bonding system 2000 is referred to as a static because the adherands to be bonded do not substantially move while they are being exposed to the electromagnetic field that activates an RF activatable composition which is located between the adherands. Referring now to FIG. 20A, bonding system 2000 includes a power supply, such as voltage supply 502, for generating an alternating voltage between output terminal 612 and output terminal 610 Connected to output terminal 612 is a probe 2006, and connected to output terminal 610 is a probe 2008 The characteristics of probe 2006 and probe 2008 are described above with reference to probes 602 and 604 In one embodiment, probe 2006 and 2008 are rectangular hollow tubes made from a conductive material, preferably copper Preferably, the height (H) and width (W) of each probe is about equal, and the length (L) is generally larger than the height and width For example, in one embodiment, the height and width of each probe is about 1/8 of an inch, whereas the length of each probe is about 10 inches. In general, the height and width of a rectangular probe, or the diameter for a cylindrical probe, ranges between about 0.02 and 0.5 inches, and the length generally ranges from about 0.25 inches to 20 feet. System 2000 is not limited to two probes A third probe (not shown) could be placed adjacent to probe 2006 such that probe 2006 will then be between the new probe and probe 2008 With this configuration, the new probe would be connected to the output terminal that probe 2008 is connected to, which in this case is terminal 610. An exemplary three probed system is illustrated in FIG 13 A One skilled in the art should recognize that any number of probes could be used, provided that no two adjacent probes are connected to the same output terminal of voltage supply 502. In one embodiment, probes 2006 and 2008 are placed in an electrically insulating block 2010 Insulating block 2010 is composed of an electrically insulating material, such as, but not limited to polytetrafluoroethylene (TEFLON 1m ) An optional electrically insulating layer 2012 (see FIG 20B) may be placed on top of probes 2006 and 2008 Preferably, electrically insulating layer is made from polytetrafluoroethylene or other like material which resists adhesion of the substrates or adherands thereto Referring now to FIG 20B, to bond adherand 2090 to adherand 2092, adherand 2090 and/or adherand 2092 is coated with a suitable composition 2091 , or a film of the composition 2091 is sandwiched between adherand 2090 and adherand 2092, or an insoluble porous carrier is saturated with composition 2091 and placed between adherand 2090 and adherand 2092 Adherands 2090 and 2092 are then placed over probes 2006 and 2008 such that composition 2091 is between the adherands and over the region between probe 2006 and probe 2008, as shown. Power supply 502 is then activated, which creates an alternating voltage between terminals 612 and 610, which creates an electromagnetic field between probes 2006 and 2008 The composition 2091 is exposed to the electromagnetic field for a predetermined amount of time. The predetermined amount of time can range between about 100 milliseconds to about one second, several minutes, or hours depending on the composition and/or the strength ofthe electromagnetic field. The electromagnetic field causes composition 2091 to heat When composition 2091 reaches a given temperature, the composition will begin to melt and flow, causing an impedance change on the matching circuit 812 The impedance change can be detected by a change in reflected power signal 832 This change in reflected power signal 832 can be used to control the intensity of the RF energy. Other methods of detecting when composition 2091 melts is to detect displacement of a pressure plate 2020 with a feed back loop After the predetermined amount of time has expired or while the composition is exposed to the electromagnetic field, the adherand can be pressed together using pressure plate 2020, pressure roller (not shown), or any other pressure delivery apparatus or means, thereby assuring a good bond The resulting bond can be an adhesive bond mechanical bond, thermal bond, or any combination of aforementioned bonds For example, composition 2091 may have adhesive properties to create an adhesive bond between adherands 2090 and 2092, and/or composition 2091 may be used as a source of thermal energy for welding the adherands together An advantage ofthe present invention is that non-electπcally conductive materials can be stacked on top of an adherand without affecting the bonding process Only composition 2091 is directly heated when the layers are exposed to RF energy having the preferred frequency range of 10 to 15 MHz Thus, by selectively heating only the composition 2091, multiple layers may be assembled prior to forming the bond between adherands 2090 and 2092 This allows the assembly of complex laminates prior to bonding Another advantage of the present invention is that RF energy can be re- app ed to the bonded product and the two (or more) adherands 2090 and 2092 can be disassembled This is known as de-activating the composition 2091 In fact, the composition 2091 can be activated and de-activated a number of times FIGS 38 and 39 illustrate two exemplary manufacturing systems in which static bonding system 2000 could be utilized FIG 38 illustrates a step and repeat manufacturing system There are many applications in general manufacturing where adherands are joined or bonded together using an adhesive In a conventional step and repeat joining (or bonding) system there is a gluing station immediately followed by a joining station The gluing station applies an adhesive to an adherand After the adhesive is applied, the adherand moves immediately to a joining station where it is brought together with the other adherand to which it is to be joined The joining station then nips the adherands together to form a bond The adhesive compositions according to the present invention allow the adhesive to be applied to the adherand(s) prior to the adherand(s) entering the manufacturing line. For example, the adhesive compositions according to the present invention may be applied at the part supplier's facility with on-demand bonding occurring for, example, days, weeks, or months later, by RF activation. Referring now to FIG. 38, a step and repeat manufacturing process as applied to a continuous production line 3802 with base adherand 3806 and top adherand 3808 being supplied to bonding system 2000 on a conveyor system 3804. In one embodiment, base adherand 3806 is pre-coated with an adhesive composition 3805 according to the present invention. Base adherand 3806 could have been coated minutes, days, weeks, or months prior to base adherand 3806 entering continuous production line 3802. Base adherand 3806 travels along the conveyor 3804 and top adherand 3808 is assembled to base adherand 3806 by hand or automatic system (not shown). The assembled adherands 3810 are placed onto a pressure plate 2010 in which probes 2006 and 2008 are embedded. The bonding process begins when an electromagnetic field is created between probes 2006 and 2008 by power supply 502. The electromagnetic field activates the adhesive composition 3805, which then creates a bond between adherands 3806 and 3808. Pressure plate 2020 is used to nip the bond during and/or after RF activation. After the bond is nipped, the assembly 3810 is removed from bonding system 2000 and placed back on the conveyor 3804. FIG. 39 illustrates an index table bonding system. Index table bonding systems are used in many manufacturing industries to automate the bonding process. Examples include the bonding of labels onto bottles. The index table process allows for setting up multiple stations where different processes in the assembly process are performed. The time the index table stops at each station is the same, thus it is dependent upon the slowest process. An advantage of using an adhesive composition according to the present invention includes the pre- application to one or both ofthe parts to be bonded prior to loading the parts onto the index table. Other advantages are fast activation and curing time. Consequently, by removing the adhesive application from the index table, one less station is used and a higher production throughput is achieved. Referπng now to FIG 39, an index table bonding system is described The index table bonding system includes an index table 3902, which is generally round and rotates either clockwise or counter-clockwise Base parts 3904( 1 )-(N) having a pre-apphed adhesive composition 3906 are placed onto index table 3902 When index table 3902 moves base part 3904( 1 ) to the next station (station 2), a top part 3908 is placed onto base part 3904 to form assembly 3910 Assembly 3910 then moves to station 3 where it is exposed to an RF field, which activates adhesive composition 3906 In station 3, the RF field is generated by probes (not shown) positioned so that adhesive composition 3906 is activated The probes may be configured to either contact the assembly 3910 and apply some pressure to aid in the bonding process Alternatively, the probes could be configured so there is no contact with the assembly 3910 After activation of the adhesive 3906, the assembly 3910 moves to station 4 for a nip or cure portion ofthe bonding process After station 4, the assembly 3909 moves to station 5 where it is unloaded from the index table 3902 FIG 21 illustrates a dynamic bonding system 2100 (also referred to as an in-line bonding system) for bonding or adhering adherands Bonding system 2100 is referred to as dynamic because the adherands to be adhered, adherands 21 10 and 21 12, continuously move through an electromagnetic field, which is generated by heating system 2140 In one embodiment, adherand 21 10 is pre-coated with a composition 2104 according to the system shown in FIG 18 Bonding system 2100 includes a roll 2102 of coated adherand 2110 and plurality of rollers 2120, 2122, 2124, 2126, and 2128 for, among other things, continuously guiding coated adherand 21 10 and adherand 21 12 through an electromagnetic field generated by heating system 2140 In one embodiment, coated adherand 21 10 and adherand 21 12 move through the electromagnetic field at a rate of about 0 01 to 2000 feet per minute, most preferably, about 1000 feet per minute (ft/minute) The bonding process begins when coated adherand 21 10 is fed onto roller 2120 Coated adherand 21 10 is then passed over roller 2122 A pressure activated construction bond may be formed by passing the two adherands 2110 and 21 12 between roller 2122 and nip roller 2124 A construction bond may be required in this process to maintain the proper location of coated adherand 21 10 and adherand 21 12 prior to and/or during activation Preferably, the composition 2104 is formulated to provide a pi essure sensitive tack when a construction bond is needed Coated adherand 21 10 and adherand 21 12 are not limited to any particular thickness As should be readily apparent to one skilled in the art, the system can be designed to accommodate any reasonable thickness of adherand In this embodiment, the invention relates to a method for dynamically bonding a first adherand to a second adherand comprising (1 ) creating an article of manufacture comprising the first adherand, the second adherand, and a composition, the composition being placed between the first adherand and the second adherand wherein the composition can be activated in the presence of an RF field, (2) moving the article of manufacture along a predetermined path, (3) generating along a portion of the predetermined path an RF field having sufficient energy to activate the composition, wherein the composition is activated by its less than one second exposure to the RF field In a preferred embodiment, the article passes through the RF field at a rate of at least about one-thousand feet per minute In a more preferred embodiment, the article passes through the RF field at a rate of about 1000 feet per minute Referring now to FIG 22, after the construction bond is formed, the construction bonded coated adherand 21 10 and adherand 21 12 are passed through an RF field 2230, which is generated by heating system 2140 FIG 22 further illustrates heating system 2140 for use in dynamic bonding system 2100 Heating system 2140 includes a power supply, such as power supply 502, for generating an alternating voltage between terminal 612 and terminal 610 Connected to terminal 612 is a probe 2210, and connected to terminal 610 is a probe 2220 The characteristics of probes 2210 and 2220 are described above with reference to probes 602 and 604 and probes 2006 and 2008 In one embodiment, probe 2210 has a distal section 221 1 , a center section 2212 and a proximal section 2213 Similarly, in one embodiment probe 2220 has a distal section 2221, a center section 2222 and a proximal section 2223 Preferably, center section 2212 is parallel with center section 2222, and they both have a length of about 48 inches when the adherands 21 10 and 21 12 are traveling at about 1000 feet/minute in the direction indicated by arrow 2130 This configuration results in about a preferred 240 millisecond dwell time Dwell time refers to the maximum amount of time that any given point on adherands 21 10 and 21 12 is positioned beneath (or over) probes 2210 and 2220 (I e , within the activation region) If the speed ofthe adherands 21 10 and 21 12 is increased, the preferred dwell time can remain constant by increasing the length of probes 2210 and 2212 For example, if it is desired for the adherands 21 10 and 21 12 to move at a rate of about 2000 feet/min over probes 2210 and 2220, and the preferred dwell time is about 100 milliseconds, then the minimum length of probes 2210 anc 2220 would be about 40 inches Although a preferred dwell time is 600 milliseconds, the dwell time can be increased to several minutes if desired by increasing the length of probes 2210 and 2220, e g , from about the 20 inches to 20 feet, and/or decreasing the speed at which adherands 21 12 and 21 10 travel over probes 2210 and 2220 Shorter probes are also contemplated, for example from about 0 25 inches to about 20 inches Preferably, probes 2210 and 2220 are positioned with respect to coated adherand 21 10 such that the composition that coats coated adherand 21 10 is beneath (or above) an activation region The activation region is the area between the center section 2212 and center section 2222 The frequency ofthe alternating voltage generated by power supply 502 can range from the low Kilohertz to high Gigahertz range In one embodiment the frequency ranges between about 1 MHz to about 5 GHz, most preferably about 10 MHz and 15 MHz The peak to peak level ofthe voltage generated by power supply 502 may range from about 500 V to 20 kV, most preferably about 1 to 15 kV The composition 2104 will remain activated as long as the RF energy is delivered After the adherands 21 10 and 21 12 pass over (or under) probes 2210 and 2220 they are nipped by non-destructive nip rollers 2126 and 2128, which assure that a good bond is created between adherand 21 10 and adherand 21 12 For optimal performance, the nip rollers 2126 and 2128 apply pressure immediately after re-flow temperatures are achieved within the adhesive material Additionally nip roller 2126 and/or nip roller 2128 may be cooled to remove thermal energy from the adherands Upon cooling, the composition forms a sti ong bond between the adherands 21 10 and 21 12 The bonded adherands can then be subsequently processed in accordance with a particular application There are a number of benefits of the above system First, the system provides a finished bond in less than about one second of activation Second, the activation process does not produce harmful emissions or by-products that may interfere with the bonding of two thin films Third, the activation only occurs in the activation region FIGS 23-27 illustrate alternative designs for heating system 2140 As shown in FIG 23, curved probes 2310 and 2320 can be used in place of straight probes 2210 and 2220 An advantage of curved probes 2310 and 2320 is that the width 2390 of the activation region is greater then the distance 231 1 between probes 2310 and 2320, whereas the width of the activation region provided by probes 2210 and 2220 equals the distance between center section 2212 of probe 2210 and center section 2222 of probe 2220 The heating system shown in FIG 24 includes probe 2410 in addition to probes 2210 and 2220 Probe 2410 is positioned between probes 2210 and 2220 Probe 2410 is parallel with probes 2210 and 2220 Preferably, the distance (d) between probe 2410 and 2210 is equal to the distance (d) between probe 2410 and probe 2220 Probes 2210 and 2220 are both connected to the same output terminal of voltage supply 502, whereas probe 2410 is connected to the other output terminal An advantage ofthe probe design illustrated in FIG 24, is that it provides a larger activation region The width 2420 ofthe activation region is greater than the distance (d) between any two ofthe probes Based on the above description, one skilled in the art will recognize that any number of probes can be used in heating system 2140, provided that no two adjacent probes are connected to the same output terminal of voltage supply 502 The heating system shown in FIG. 25 is similar in concept to the one shown in FIG. 24. A curved probe 2510 is placed between curved probes 2310 and 2320. Curved probes 2310 and 2320 are both connected to the same output terminal of voltage supply 502, whereas probe 2510 is connected to the other output terminal. Again, an advantage ofthe heating system shown in FIG. 25 is that it can provide a larger activation region than the similar heating system shown in FIG. 23. FIG. 26 illustrates another heating system. The heating system shown in FIG. 26 includes two plates 2610 and 2620. Plate 2610 is positioned above adherand 21 10 and plate 2620 is positioned below adherand 21 12. Thus, composition 2104 travels between plates 2610 and 2620. Plate 2610 is connected to output terminal 610 of voltage supply 502, and plate 2620 is connected to output terminal 612 of voltage supply 502. When voltage supply 502 is turned on, it generates an electromagnetic field between plates 2610 and 2620, which is used to activate composition 2104. FIG. 27 illustrates another perspective of plates 2610 and 2620. As is apparent from FIG. 27, the width ofthe activation region for this design is simply the width (W) ofthe plates. The center to center distance (d) between plate 2610 and plate 2620 can range from 0.02 inches to 20 inches. In one embodiment, the distance ranges between 0.25 inches and 1.5 inches. The length (L) of course depends on the desired dwell time and the rate at which any given point on adherand 21 10 or 21 12 travels between any two points along the length of one ofthe plates. XI. Exemplary Specific Applications ofthe Present Invention The susceptor compositions may be employed for many purposes including bonding, cutting, and coating. Thus, the susceptor compositions maybe employed for packaging applications, e.g. to bond or adhere cases or cartons as described in U.S. 5,018,337, but with the additional step of RF activation. Applications for the RF cured thermoset compositions, which are illustrative only and not to be considered limiting ofthe scope ofthe present invention, include: Coatings for conventional and spray applications on plastics metals, wood etc Corrosion resistance coatings Industrial and protective coatings Top coats Automotive coatings Lamination of composites Laminating adhesives Bonding of structural composites Inks and decorative coatings Barrier coatings Additional applications are listed below, but are likewise illustrative and not limiting ofthe scope ofthe present invention A. Manufacture of Flexible Packaging FIGS 28A and 28B illustrate one embodiment of a system for the manufacture of flexible packaging Flexible packages are used for, among other things, packaging foods The system includes a system 2802 (see FIG 28A) for manufacturing an RF activated adhesive film 2815 and a bonding system 2804 (see FIG 28B) for bonding the adhesive film 2815 to another film 2850 Referring now to FIG 28A, film manufacturing system 2802 includes an extruding system 2810, a casting wheel 2814 a heating system 2820, a stretching system 2830, and an optional film roller 2840 In one embodiment, extruding system 2810 includes three extruders 281 1, 2812, and 2813 An RF activated adhesive composition according to the present invention is first formulated into an extrudable resin (for example, ethylene vinyl acetate or other polymer based material is added to the adhesive composition) and then provided to extruder 2813 in a pellet or liquid form Polypropylene or other like similar substance, such as but not limited to ethylene vinyl acetate (EVA), is provided to extruder 281 1, and a sealing material is provided to extruder 2812 The output of extruders 281 1- 2813 are cast into a film 2815 by casting wheel 2814 FIG 29 illustrates film 2815 As shown in FIG 29, film 2815 includes a first layer 2902 consisting ofthe sealing material a second layer 2904, e g OPP and/or EVA and/or other similar substance and a third layer 2906 consisting of the RF activated adhesive Because film 2815 includes an adhesive composition according to the present invention, film 2815 can be RF activated Referring back to FIG 28A, film 2815 is provided to heating system 2820 In one embodiment, heating system 2820 includes heater rollers 2821 and 2822 The function of heating system is to heat the film to a temperature that allows the film to be stretched After being processed by heating system 2820, film 2815 is stretched by stretching system 2830 In one embodiment, stretching system 2830 includes a plurality of stretch rollers 2831 , 2832, 2833, 2834, and 2835 and a transverse stretcher 2837 Stretching system 2830 stretches film 2815 both length and width wise After being stretched, film 2815 may be rolled up using film roller 2840 Alternatively, film 2815 can be cut and stacked after being stretched Referring now to FIG 28B, bonding system 2804 is used to bond film 2815 with film 2850 In one embodiment, film 2850 is a 70 gauge oriented polypropylene (OPP) film Film 2850 is passed over a print wheel 2855 and then through oven 2857 A pair of nip rollers 2860 and 2861 press film 2815 with film 2850 to form a construction bond and thus form a single multi-layer film 2870 FIG 30 illustrates one embodiment of film 2870 As shown in FIG 30, film 2870 includes layer 2902 consisting of the sealing material, layer 2904 that includes thermoplastics and/or elastomers, for example, OPP and/or EVA and/or other similar substance, third layer 2906 consisting ofthe RF activated adhesive, a fourth layer 3002 consisting ofthe ink applied by print wheel 2855, and a fifth layer 3004 consisting of film 2850 Referring back to FIG 28B, an RF heating system 2875 creates an RF field that is used to heat adhesive layer 2906 Heating system 2875 defines an activation region The activation region is an area in which the RF field generated by heating system 2875 is strong enough to activate adhesive layer 2906 Film 2870 can travel through the activation region in as quickly as about 100 milliseconds Shortly after passing through the activation region, film 2870 is mpped by nip rollers 2880 and 2881 and then rolled by film roller 2885 FIGS 16A and 16B illustrate one embodiment ofthe probe portion of heating system 2875 Other heating systems could be used, such as those described above with respect to FIGS 20 and 21 FIG 31 illustrates an alternative system 3100 for manufacturing an RF activated adhesive film for use in the flexible packaging industry Svstem 3100 is similar to system 2802, except that system 3100 does not include extruder 2813 In place of extruder 2813, system 3100 includes an adhesive applicator 3101 and a heating system 3102 An adhesive composition according to the present invention is formulated into a liquid dispersion and applied to film 2815 by adhesive applicator 3101 In one embodiment adhesive applicator 3101 includes a gravure application tool (not shown) Heating system 3102 can be a conventional heating system, such as an oven, or it can be an RF heating system, such as heating system 600 or any ofthe other heating systems described herein B. Food Packaging and Cap Sealing Conventionally, metallic foils are used as susceptors of electromagnetic energy to generate heat for package sealing Typical examples include tamper evident bottle seals (I e , cap sealing) and food packaging While the conventional systems are effective in sealing the packages, the use of metallic foils eliminates the manufacturer's ability to perform post sealing inspection, such as metal detection, x-ray, and the like Additionally, there may be a recycling benefit and a cost saving to the system by eliminating the metallic foil One solution is to replace the metallic foil with a composition of the present invention The composition may or may not have adhesive properties FIG 32 illustrates a conventional aseptic package construction A conventional aseptic package includes an outer polyethylene layer 3202, a paper layer 3204, a second polyethylene layer 3206, a layer of metallic foil 3208, a third 3210 polyethylene layer, an inner polyethylene layer 3212, and a container 3214 that holds the food or beverage Inner polyethylene layer 3212 is the layer that contacts with the container 3214, and is used to seal the container during the food packaging process The sealing is achieved through induction heating of the metallic foil layer 3208 causing the inner polypropylene layer 3212 to melt and bond to the container 3214 FIG 33 illustrates one embodiment of a packaging construction that does not use metallic foils The packaging construction includes the outer polyethylene layer 3202, the paper layer 3204, the second polyethylene layer 3206, a susceptor composition according to the present invention 3302, a barrier layer 3310, an inner layer 3212, and a container 3214 that holds the food or beverage Inner layer 3212 is the layer that contacts with the container 3214, and is used to seal the container 3214 during the food packaging process Inner layer 3212 can be a polyethylene or EVA layer In one embodiment barrier layer 3310 is an EVOH barrier layer The sealing is achieved through RF heating of susceptor composition 3302, which causes the inner layer 3212 to melt and bond to the container 3214 The advantage of replacing metallic foil 3208 with susceptor composition 3302 is that now the container 3214 can be inspected after it is sealed by using a metal detector or x-ray machine, and there are recycling advantages as well A conventional cap sealing construction is illustrated in FIG 34 FIG 34 illustrates a polyethylene bottle 3402, a seal 3401, and a bottle cap 3414 Seal 3401 includes several layers of substrate, including a polyethylene layer 3404, a metallic foil layer 3406, another polyethylene layer 3408, a wax layer 3410, and a paper layer 3412 Seal 3401 is adhered to bottle 3402 by heating foil through induction, which causes layer 3404 to weld to bottle 3402 As discussed above, it is desirable to remove metallic foil layer 3406 FIG 35 illustrates an improved seal 3501 for bottle 3402 Seal 3501 is identical to seal 3401 (see FIG 34), except that the metallic foil 3406 has been replaced with a composition 3502 according to the present invention As discussed above, the advantage of removing metallic foil 3406 is that now bottle 3402 can be inspected after it is sealed by using a metal detector or x-ray machine, and can be more easily recycled Another use ofthe compositions described herein is to attach a flexible bag 3602 containing dry food to an outer box 3604, as illustrated in FIG 36 In one embodiment, flexible bag 3602 includes three layers, 3610, 361 1 and 3612 and outer box 3604 is a paper product, such as a paper board To bond flexible bag 3602 to outer box 3604, an adhesive composition 3620 according to the present invention is placed between outer box 3604 and layer 3610 Adhesive composition 3620 is then exposed to an RF field that causes the composition 3620 to melt and flow and bond layer 3610 to outer box 3604 In one embodiment, layer 3610 is a polyethylene layer, layer 361 1 is an EVOH barrier layer, and layer 3612 is an EVA food contact layer In another embodiment (see FIG 37), outer box 3604 is coated with a polyethylene layer (or other like layer) 3730 This configuration creates an improved bond C. Printing Applications The susceptor compositions ofthe present invention may also be applied together with one or more inks to provide writing, a design or graphic, e g as is described in U S Patent No 4,595,61 1 Particular application of this aspect of the invention is in the preparation of ink-printed substrates such as ovenable food containers Examples of pigments that can be combined with the susceptor composition include titanium dioxide, iron oxide pigments, carbon black and organic pigments such as isoindoline yellow In a preferred embodiment, the susceptor is a sulfonated polyester Alternatively, a sulfonated polyester-cationic dye salt may be employed as disclosed in U S Patent No 5,240,780 The substrate may be printed once or multiple times to achieve the desired result Once printed, the substrate may be further coated with a clear unpigmented composition which may comprise the susceptor composition ofthe invention The same composition used to print may be used to further coat, but without the added pigments The susceptor compositions may be RF activated after each pnntmg/coating step, or after all ofthe coatings are applied Finally, the substrate may be coated with a clear polyester sealing resin An extension the printing application is high speed ink-jet used in printers/copiers Inks formulated as liquids (H-P/Cannon) or solid (Tetronic) composition can contain the susceptor compositions of this invention in amounts effective that can be activated by RF energy for rapid drying and fixing Current ink formulations are too "slow in drying" or need excessive heat energy D. Bookbinding and Mailers The susceptor compositions ofthe present invention may be used to bond paper substrates used in printing and/or copying An advantage of the present invention is that a substrate to be printed on (such as a paper substrate) can be coated with a susceptor composition described herein prior to printing on the substrate For example, FIG 43 illustrates a process for assembling a book, magazine, or periodical, or the like In step 4302, a portion of one side of a substrate is coated with a susceptor composition that functions as an adhesive Any one of the various methods for coating a substrate described herein can be used to coat the substrate FIG 44 illustrates a preferred portion of a substrate to be coated with the susceptor composition As shown in FIG 44, a thin strip of the susceptor composition 4404 coats one edge of the substrate 4402 The portion ofthe substrate that is not coated is the portion where ink will be printed Preferably, the susceptor composition 4404 is formulated such that it is tack free, however, this is not a requirement After the substrate 4402 has been coated, the substrate may be processed into rolls, stacks and the like and stored for later use (step 4304) In step 4306, the coated substrate is fed into a printing means that prints ink onto the substrate The printing means can be a conventional printer or conventional photocopying machine Further, the substrate can be fed into the printing mean as a continuous substrate or as cut pieces For this example, we will assume that cut pieces ofthe substrate are fed into the printing means In step 4308, after the printing means prints ink onto a substrate, the substrate is stacked with the other substrates that have already been fed into the printing means as shown in FIG 45 The stack is placed in an electromagnetic field The electromagnetic field causes the susceptor composition to melt and flow The stack is then nipped to assure a good bond (step 4312) In one embodiment, prior to placing the stack in the electromagnetic field, the substrate stack is pressure bonded by applying upward and/or downward pressure on the stack In another embodiment, the ink that is printed on the substrates includes a susceptor composition In this way, the ink can be dried rapidly by passing the substrate through an electromagnetic field In another embodiment, mailers or envelopes can be constructed Referring to FIG 46, a portion of one side of substrate 4602 is coated with a susceptor adhesive composition 4604 Preferably, the susceptor adhesive composition 4604 is formulated so that it is tack-free The substrate 4602 includes a fold line 4610 The coated substrate 4602 can be fed into a printing means that prints ink onto the substrate After the ink is printed thereon, the substrate is folded along the fold line 4610 so that the top portion 4612 of the substrate 4602 contacts the bottom portion 4614 ofthe substrate (see FIG 47) At this point, the substrate is passed through the electromagnetic field so as to melt and flow the susceptor composition 4604, thereby bonding the top portion 4612 of the substrate with the bottom portion 4614 when the susceptor composition 4604 solidifies E. Security Devices As would be apparent to one skilled in the relevant art(s), the adhesive of the present invention can be used to seal containers, casings, housings and the like (hereafter "container") In particular, the adhesive of the present invention is preferably used to seal containers that a manufacturer does not want accessed by others A manufacturer may want to prevent a third party from opening certain containers for security, safety or quality control reasons However, the inside of the container must still be accessible to the manufacturer or qualified repair facility By exposing the seal to an electromagnetic field, the manufacturer can disassemble the container For example, a manufacturer may want to prevent an article intended for one-time use from being reused As such, the adhesive of the present invention can be used, for example to seal the shell or casing of a disposable camera The manufacturers of such disposable cameras often do not want to have the shells reloaded and reused by the consumer or a competitor company If the adhesive of the present invention is used to seal the camera shell, then when the film developer opens the camera body to remove and process the film, mating sections ofthe camera shell attached by the adhesive would break or deform such that the camera body could not be reused As such, the adhesive ofthe present invention would prevent tampering with and unauthorized reloading of disposable camera shells FIG 48 shows an example of a container 4800 sealed with a susceptor composition ofthe present invention Container 4800 includes a first portion 4804 and a second portion 4808 In one embodiment, first portion 4804 is a container base and second portion 4808 is a lid Container 4800 can be made from a variety of materials, including, for example, polypropylene, polystyrene, polyolefin, wood or wood products, rubber, plastics, glass, ceramics, paper, cardboard, natural or synthetic textile products, aluminum or other foils, metals, or any combination of these materials An adhesive composition 4812, made in accordance with the present invention, is applied to a surface of container 4800 In the example of FIG 48, adhesive composition 4812 is applied to a first mating surface of first portion 4804 Second portion 4808 is then placed on top of first portion 4804, so that a second mating surface of second portion 4808 comes in contact with adhesive composition 4812 A suitable electromagnetic field, as described herein, is then applied to adhesive composition 4812 to join the first and second mating surfaces of first and second portions 4804 and 4808 To open container 4800, suitable RF energy must again be applied to container 4800 to cause adhesive composition 4812 to reflow If a person attempts to open container 4800 without applying the suitable electromagnetic field, the container 4800 is designed to preferably break or catastrophically fail and so that it cannot be reused FIG 49 shows another example of a device 4900 sealed or otherwise joined together with a composition ofthe present invention De\ ice 4900 includes a first portion or substrate 4904 and a second portion or substrate 4908 Device 4900 can be made of a variety of materials as discussed above with respect to container 4800, shown in FIG 48 In this embodiment, first substrate 4904 includes a male portion 4912 forming the first mating surface Male portion 4912 includes a narrowed section 4916 and a wider section 4920 A corresponding female portion 4924 forming a second mating surface is formed in second portion 4908 and is configured to accommodate or receive wider section 4920 of male portion 4912 Second portion 4908 may also be configured to accommodate a portion of narrowed section 4916 An adhesive composition 4928, made in accordance with the present invention, is applied to the second mating surface of female portion 4924 of second portion 4908 First portion 4904 is then assembled so that the first mating surface comes in contact with adhesive composition 4928 on second portion 4908 while the adhesive composition is within the electromagnetic field First portion 4904 is locked into second portion 4908 once the application of electromagnetic filed is discontinued, causing adhesive composition 4928 to solidify To disassemble device 4900, an electromagnetic field must again be applied to adhesive 4928 to cause it to reflow and allow the portions 4904 and 4908 to separate If someone attempts to disassemble device 4900 without application of a suitable electromagnetic field, narrowed section 4916 of male portion 4912 will break or otherwise catastrophically fail resulting in device 4900 being unusable As such, this embodiment will prevent authorized disassembly and reuse of device 4900 FIG 50 shows another example of a device 5000 sealed or otherwise joined together with a composition of the present invention Device 5000 is similar to device 4900 described above with respect to FIG 49, except that an electronic circuit path 5004 is added to male portion 4912 such that it is disposed through narrowed section 4916 As such, should portions 4904 and 4908 of device 5000 be disassembled without application of a suitable electromagnetic field, electronic circuit path 5004 will be cut during failure of narrowed section 4916, resulting in further failure of device 5000. FIG. 51 shows still another example of a cross-section of a container 5100 that has been sealed with the adhesive ofthe present invention. Container 5100 includes a first portion 5104 and a second portion 5108. Container 5100 can be made of a variety of materials, as discussed above with respect to container 4800, shown in FIG. 48. First portion 5104 includes a protrusion 51 12 which forms a first mating surface. In the embodiment shown in FIG. 51 , protrusion 51 12 extends around the entire circumference of container 5100. However, it would be apparent to one skilled in the relevant art that one or more discrete protrusions 51 12 could be used instead of or in addition to the continuous protrusion 51 12. Second portion 5108 includes a recess 51 16 which forms a second mating surface corresponding to the first mating surface of protrusion 51 12. Protrusion 51 12 and corresponding recess 51 16 are formed slightly inward ofthe periphery of container 5100 to so that when first and second portions 5104 and 5108 are joined, the mating surfaces and an adhesive composition 5120 therebetween cannot be accessed, thereby further reducing the risk of a person prying apart or otherwise disassembling container 5100. Adhesive composition 5120, made in accordance with the present invention, is applied to the second mating surface of recess 51 16. First and second portions 5104 and 5108 can be joined together by application of suitable electromagnetic field and similarly disassembled by re-application ofthe electromagnetic field. The invention relates to an apparatus, comprising: a first portion having a first mating surface; a second portion, having a second mating surface; a composition disposed between the first mating surface and the second mating surface, wherein the composition comprises a susceptor and a polar carrier wherein the susceptor and/or the polar carrier are present in amounts effective to allow the composition to be heated by RF energy, and wherein the composition adheres the first mating surface to the second mating surface such that application of a force to separate the first mating surface and the second mating surface results in breakage ofthe apparatus unless the composition is in a melted state In this apparatus, the composition may be disposed on the first mating surface and the second mating surface such that the composition is not accessible when the first and second mating surfaces are joined In another embodiment, the first mating surface may comprise a protrusion disposed on the first portion In another embodiment, the second mating surface may comprise a recess formed in the second portion In a further embodiment, the apparatus may further comprise an electronic circuit path disposed in the protrusion In another embodiment, the first portion and the second portion are disassembled upon application of an electromagnetic energy to the composition F. Thermal Destruction The susceptor composition ofthe present invention can not only be used to coat a substrate and bond adherands, but also can be used to cut a substrate A substrate can be cut using a susceptor composition described above by first applying the susceptor composition to at least one side ofthe substrate Next, an electromagnetic field is applied to the susceptor composition causing the susceptor composition to heat The thermal energy generated by the susceptor composition heats the substrate, particularly the section ofthe substrate that is in contact with the susceptor composition The substrate is heated until a section ofthe substrate melts resulting in the substrate being cut In this embodiment, the invention relates to a method for cutting a substrate, comprising applying a composition to a portion of the substrate, wherein the composition comprises a susceptor and polar carrier wherein the susceptor and/or the polar carrier are present in amounts effective to allow the composition to be heated by RF energy, and wherein the portion of the substrate defines a first section ofthe substrate and a second section ofthe substrate, melting the portion ofthe substrate wherein the melting step includes the step of heating the composition, wherein the step of heating the composition includes the step of applying RF energy to the composition, after the portion ofthe substrate has begun to melt, applving a force to the substrate to separate the first section from the second section XII. Kits The invention also provides kits for use in the preparation ofthe bonding composition according to the present invention Kits according to the present invention comprise one or more containers, wherein a first container contains a susceptor composition ofthe invention Additional kits ofthe invention comprise one or more containers wherein a first container contains a susceptor as described above and a second container contains one or more adhesive compounds and/or carriers, such as water, glycerine, N-methyl pyrrohdone (NMP), dimethylformamide (DMF), dimethylacetamide (DMAC), dimethylsulfoxide (DMSO), tetrahydrofuran (THF), polyvinyl pyrrohdone (PVP), polyvinylpyrrohdone/vinyl acetate copolymer (PVP/VA), and branched polyesters The kits of the invention may be used to produce one or more of the bonding compositions of the present invention for use in a variety of applications as described below The invention also provides for kits comprising at least two containers, wherein one ofthe containers comprises a susceptor and another ofthe containers comprises a polar carrier, wherein when the susceptor and the carrier are applied to substrates and the applied susceptor and carrier are interfaced, a composition is formed that is heatable by RF energy XIII. Experimental Set-up FIG 40 shows an example experimental set-up utilized to test the susceptor compositions described above with respect to example 4 An RF signal is generated by a signal generator 4001 Signal generator 4001 can be an HP 8165 A signal generator (available from Hewlett Packard Corporation) The RF signal is coupled to the input side of RF power amplifier 4002 (available from ENI) The RF power is fed from the output side of RF power amplifier 4002 to the input side of an impedance matching circuit 4003 that functions to match the output impedance to the combined load impedance of coil 4004 and test sample 4005 Impedance matching circuit 4003 can be designed according to known electronics principles as would be apparent to those of skill in the art See, e g , "The Art of Electronics," by P Horowitz and W Hill, Second Ed , Cambridge University Press (1994), especially Chapter 40, incorporated by reference herein The RF power of load coil 4004 was inductively coupled to test sample 4005 The frequency of signal generator 4001 was tuned to result in resonance at load coil 4004 This frequency was detected by a single turn 2 inch diameter probe loop 4007, which was located just below and in proximity to load coil 4004 Resonance was indicated by a maximum resulting voltage drop across piobe loop 4007, and was displayed on an oscilloscope 4006, such as a model number OS7020A oscilloscope available from Goldstar Frequency tuning was performed at sufficiently low RF powers in order to avoid heating of test sample 4005 Once the frequency of signal generator 4001 was tuned to resonance, the RF power delivered to load coil 4004 was increased to a desired power level by increasing the output level of signal generator 4001 The front panel of RF power amplifier 4002 displayed the measured RF power level delivered to test sample 4005 FIG 41 illustrates another experimental heating system 4100 Heating system 4100 includes a signal generator 4102 Signal generator 4102 can be an HP 8165 A signal generator (available from Hewlett Packard Corporation) Signal generator 4102 is used to generate a low level radio frequency signal having a frequency between 10 MHz and 15 MHz Signal generator has a control panel 4103 that allows a user to manually select the frequency of the generated radio frequency signal The output level ofthe signal is also controllable from control panel 4103, or from a controller 4114 The output level of the generated RF signal can vary from 0 Volts to 1 Volt peak to peak into 50 ohms, or 0 dBm Controller 41 14 is interfaced to signal generator through a general purpose lnterface board (GPIB) (not shown) In one embodiment, controller 41 14 is a personal computer (PC) running the Wιndows (R) operating system A visual C++ program that provides a user interface for controlling the output level of signal generator 4102 is configured to run on controller 41 14 The low level RF signal generated by signal generator 4102 is provided to the input of a broadband RF amplifier 4106 using a coaxial cable 4104 Preferably, broadband RF amplifier 4106 is the A 1000 broadband amplifier sold by ENI of Rochester, NY, and coaxial cable 4104 is a standard RG58 coaxial cable Broadband Amplifier 4106 amplifies the low level RF signal by 60 dB, thereby providing a 1 Kilowatt output into a 50 ohm load for a 1 milliwatt (0 dBm) input If the low level RF input signal provided to amplifier 4106 consists of a timed pulse, amplifier 4106 will amplify the pulse to produce a high level pulse output Connected to the output of broadband amplifier 4106 is a directional coupler 41 10 A suitable directional coupler can be purchased from Connecticut Microwave Corporation of Cheshire, Connecticut Directional coupler 41 10 is connected to the output of amplifier 4106 through an RF cable 4107, such as an RG393 RF cable The output of directional coupler 41 10 is connected to an impedance matching circuit 4122 using RG393 RF cable 41 12 The function of impedance matching circuit 4122 is to match a 50 ohm input impedance to a variable impedance of probes 602 and 604 and the sample 410 Typical impedances of probes 602 and 604 in combination with sample 410 range from 200 ohms up to 500 ohms Directional coupler 41 10 has a reflected power output port 41 1 1 that is connected to an oscilloscope 41 18 Preferably, oscilloscope 41 18 is a TDS210 digital real time oscilloscope available from Tektronix, Inc Directional coupler 41 10 provides a signal representing the amount of reflected power to oscilloscope 41 18, which then displays the magnitude ofthe reflected power The process for heating sample 410 using heating system 4100 will now be described Initially, an operator interacts with a user interface on controller 41 14 to activate signal generator 4102 so that it produces a 50 millivolt RF signal The reflected power is then observed on oscilloscope 41 18. The frequency ofthe 50 millivolt RF signal and matching circuit 4122 are adjusted such that the reflected power is minimized. Once the frequency and the matching circuit are adjusted such that the reflected power is minimized, the signal generator is turned off and sample 410 is placed close to probes 602 and 604. Next, controller 41 14 is used to turn on signal generator 4102 so that it once again produces a 50 millivolt RF signal. At this point, the frequency and matching circuit are adjusted again until the reflected power is minimized. On achieving the minimum reflected power, signal generator 4102 is turned off. Next, operator uses controller to direct signal generator to produce an RF signal with a voltage ranging from 100 millivolts to 1000 millivolts and with a pulse time of between 20 milliseconds and 1000 milliseconds. This low level RF signal is amplified by broadband amplifier 4106. The amplified signal is then provided to impedance matching circuit 4122 and an a RF pulsed electromagnetic field is produced at probes 602 and 604. The presence ofthe pulsed electromagnetic field causes sample 410 to heat. FIG. 42 illustrates probes 4202 and 4204, which were the probes utilized to test the compositions described herein. The present invention is not limited to this or any particular probe design. Probe 4202 and probe 4204 are both 1/8 inch square copper tubes. Probe 4202 and probe 4204 both rest on a block 4250 of non-electrically conductive material, preferably, but not limited to, TEFLON 1 " 1 . More specifically, block 4250 has 1/8 inch square slots milled therein so that probes 4202 and 4204 are recessed into block 4250. Probe 4202 has a proximal section 4209, a center section 4210, a transition section 421 1, and a distal section 4212. Similarly probe 4204 has a proximal section 4213, a center section 4214, a transition section 4215, and a distal section 4216. Center section 4210 is parallel with center section 4212. The center to center distance between center section 4210 and center section 4212 is on half of an inch. Proximal section 4209 diverges away from probe 4204. Similarly, proximal section 4213 diverges away from probe 4202. The center to center distance between the proximal end of proximal section 4209 and the proximal end of proximal section 4213 is about at least one and three sixteenths of an inch Distal section 4212 is parallel with distal section 4216 and parallel with center section 4210 The center to center distance between distal section 4212 and distal section 4216 is about at least one and three sixteenths of an inch Transition section 421 1 is between center section 4210 and distal section 4212 Similarly, transition section 4215 is between center section 4214 and distal section 4216 The reason the distance between the proximal end of proximal section 4209 and the proximal end of proximal section 4213 is about at least one and three sixteenth of an inch is to prevent arcing at the ends of probe 4202 and 4204 For that same reason the distance between distal section 4212 and distal section 4216 is about at least one and three sixteenth of an inch XIV. Examples Without further elaboration, it is believed that one skilled in the art can, using the preceding description, utilize the present invention to its fullest extent The following preferred specific embodiments are, therefore, to be construed as merely illustrative and not limitative ofthe remainder ofthe disclosure in any way Examples Example 1 Various susceptor compositions were screened for use at frequencies from about 4 MHz to 15 MHz, and at power levels from about 0 5 kW to 1 kW RF frequencies of less than about 15 MHz are much less costly to produce and operate than RF frequencies of greater than 15 MHz The best results consistently occurred at the upper ends ofthe experimental frequency and power ranges (e g , 15 MHz and 1 kW) See FIG 6 for a schematic diagram ofthe experimental setup and equipment used for the various tests described herein According to the present invention, a preferred composition comprises a uniform solution of PVP, NMP, and SnCl 2 . A suitable susceptor composition comprises SnCl 2 present in a concentration of from about 1 % to about 50 %, NMP in a concentration of from about 25% to about 75%, and PVP in a concentration of from about 1 % to about 35%). These three components are soluble in one another These components were mixed together to form a uniform solution that was able to be heated from about 75° F to a boiling point of about 280°F in several seconds. Acceptable results can also be obtained, for example, by substituting similar concentrations of PVP/vinyl acetate copolymer for PVP, and substituting similar concentrations of lithium perchlorate for SnCl 2 . In addition, other suitable compositions include a mixture comprising ethylene/vinyl acetate copolymer in a concentration of from about 75% to about 99% and ethylene/acrylic acid copolymer in a concentration of from about 1%> to about 25%, a mixture comprising LiC 2 H 3 O 2 in a concentration of from about 1% to about 25%, ethylene/vinyl acetate copolymer in a concentration of from about 50% to about 98%o, and styrenated ethylene/acrylic acid copolymer in a concentration of from about 2% to about 25%, and a mixture comprising PVP/vinyl acetate copolymer in a concentration of from about 5% to about 35%>, SnCl 2 in a concentration of from about 5% to about 49%, and NMP in a concentration of from about 1% to about 90%). Other composition constituent concentrations will be apparent to those of skill in the art based on the present description. In this example, a preferred susceptor composition comprising SnCl 2 in a concentration of about 33%, NMP in a concentration of about 50%, and PVP in a concentration of about 17% was prepared to bond various combinations of thin polyolefm layers of polypropylene (PP) and polyethylene (PE). This example susceptor composition resulted in a uniform dispersion of salt ions in a polymeric adhesive. The experiment was conducted by saturating a second carrier, a thin layer of an insoluble porous carrier (in this example non-woven PP), with a small amount of the susceptor composition. The example salt-based susceptor composition provides a continuous matrix of salt ions in a polar organic medium throughout the insoluble porous carrier As shown schematically in FIG 3, the insoluble porous carrier 302 was sandwiched in-between two layers of PP or PE, layers 304 and 306, respectively, and then transversely heated by the application of RF energy By RF heating at about 14- 15 MHz for about 1 -2 seconds at about 0 8-1 kW of power output, sufficient bonding occurred between the non-woven PP carrier and the layers of PP and PE In this example, the strength of the bonded region was at least as strong or stronger than the PP or PE substrates themselves The polyolefm layers to be bonded were chosen from combinations of ( 1 ) PP non-woven and (2) PE film The results of this example are shown below in Table 1 Table 1 For each combination, the saturated insoluble porous carrier bonded the outer layers in about 1-2 seconds There was evidence of melting in the outer layers, with some minor substrate distortion and tiny melt holes By using the saturated PP non-woven carrier, a uniform matrix ofthe adhesive and susceptor components resulted in intimate contact between the adhesive component and both outer layers Example 2 The susceptor composition utilized in this example comprised SnCl, in a concentration of about 33 %, dissolved in a mixture of NMP in a concentration of about 50 % and PVP in a concentration of about 17 % Various PP and PE substrate surfaces were coated with the RF susceptor composition, including (1 ) PP non-woven and (2) PE film The susceptor composition was hand drawn onto each surface as a wet layer that would eventually dry leaving a coating which was dry to the touch RF heating tests were performed on the coated substrates In each case, two like samples were placed together with the coated surfaces in contact with one another The contacted surfaces were placed in a load coil that was designed to clamp the surfaces firmly together and transversely heat a 0 25 inch x 8 inch strip ofthe susceptor composition The operating frequency was about 14 MHz, and the power delivered to the coil was about 1 kW The tests were split into two parts using a wet susceptor composition and using a vacuum dried susceptor composition The results are shown in Table 2 Vacuum drying was employed in this experiment as an extreme experimental condition for comparison purposes, but is not expected to represent a commercial embodiment Table 2 Coated Substrates in Contact, Under 1.2 kW RF at 14 MHz The results show that the wet susceptor composition generates enough heat within 1 -2 seconds at 14 MHz and 1 kW to melt the PP non- woven or PE film in transverse heating of thin hand drawn films Bonding is successful between layers of PP non-woven As layers of PP non-woven are brought together, the susceptor composition is displaced into the open space between the fiber ofthe PP non-woven layers, allowing the two layers of PP non-woven to come together and make intimate contact, enabling bonding during re-flow ofthe layers Complete bonding was not demonstrated between layers of PE film As layers of PE film were brought together, the susceptor mixture behaved as a hydrostatic middle layer or boundary, preventing intimate contact between the two outer polyolefm layers It was observed that the material in the layers of PE was more likely to partition away from the susceptor composition than to cross the susceptor composition layer during melting and re-flow It was also observed that as the susceptor composition was vacuum dried, it lost its ability to be RF heated effectively Results were likely due to one or more ofthe following factors' the precipitation of ions back into an inactive salt as the solvent volatilizes to form the dry coat, a decrease in translational mobility of any ions still supported by the dry coating, thus preventing RF heating from occurring, and, in the case of PE films, an insufficient intermolecular contact due to the smoothness of the films According to the present invention, this problem can be solved by introducing an additive, such as a surfactant, nonvolatile solvent or, plasticizer to the composition, to achieve better attachment Example 3 In this example, an RF activated susceptor composition was prepared from an EASTMAN AQ branched polyester (available from the Eastman Chemical Corporation) and an aqueous solution of SnCl 2 . Various layers of PP non-woven and PE film were tested The susceptor composition that was used in this example comprised SnCl 2 dissolved in distilled water This solution was blended with a branched polyester adhesive component, EASTMAN AQ35S Suitable concentrations ofthe branched polyester ranged from about 25% to about 75%. In a series of experiments, the susceptor composition was used to adhere all combinations of (1) PP non-woven and (2) PE film substrates In each expeπmental combination the composition was first coated onto the two substrate surfaces and dried under ambient conditions similar to those used in commercial practice The two substrates were then pressed together in the work coil with the two susceptor composition coated surfaces in contact with each other The coated surfaces were not tacky enough at this point to result in contact adhesion between the substrates All combinations of substrates were successfully adhered to one another by RF heating for a period of about 1 second at about 14 MHz and about 1 kW The substrates were adhered to each other by the RF-activated susceptor composition, instead of being bonded by re-flow of the substrate No apparent melting or distortion of the substrate occurred This example demonstrates that a susceptor composition coating can be dry to the touch and still be activated by RF heating Example 3a Analogous to Example 3 above, the active ingredients Eastman AQ35S and SnCl 2 (in constituent concentrations consistent with the parameters described above) were dissolved in NMP to form a susceptor composition The composition was coated on a PP non-woven web and was allowed to air dry The slightly tacky web was placed between polyolefm substrates and the assemblies were RF heated in the RF work station at 14 65 MHz and about 0 8 kW for 5 seconds Good adhesion was obtained in each case Example 3b A susceptor composition capable of inductive activation was prepared with an aqueous dispersion of a sulfopolyester, Eastek 1300 Polymer (available from Eastman Chemical Company), by addition of SnCl 2 A precipitate was recovered from this mixture and a film from this precipitate was obtained by pressing between hot platens at about 200 F and 1000 psi for a short time This film was slightly wet and was sandwiched between a PE film and a PP non-woven web The assembly was RF heated in the RF work station at 14 63 MHz and about 0 8 kW for 1 second Good adhesion without substrate deformation was achieved Example 3c Analogous to Example 3b, additional experiments were performed in which slightly wet-to-touch thin films ofthe susceptor compositions of example 3b were sandwiched between two stacks consisting of multiple layers of non- woven PP or multiple layers of non-woven PP laminated to PE film Three different types of sandwiched assemblies were tested, including (1) 8 layers of non- woven PP / susceptor composition / 8 layers of non-woven PP, (2) 2 layers of PP non-woven laminated to PE film / susceptor composition / 2 layers of PP non-woven laminated to PE film (with PP non-woven facing PE film at the stack interface), and (3) 4 layers of PP non-woven/ susceptor composition / 4 layers of PP non-woven In each case, the assemblies were RF heated in the RF work station at 14 63 MHz and about 0 8 kW for 1 second In all cases, good adhesion occurred between the multilayer stacks without causing distortion to the stacks In this experiment, each multilayered stack was pre-assembled using a conventional contact adhesive, and the two stacks were later adhered to one another using the susceptor composition However, it is contemplated in the practice of the invention that each multilayer stack can be preassembled using a susceptor composition to either simultaneously or sequentially bond or adhere the various layers of each stack Example 4 Based on the success ofthe susceptor compositions tested in Examples 1- 3b, other susceptor compositions were made and tested In this example, sample compositions (in constituent concentrations consistent with the parameters described above) were tested in half-filled test tubes nearly centered within the coil ofthe RF equipment described in FIG 40 Various settings for voltage input and frequency of the current were investigated Table 3 summarizes the results of these experiments The effectiveness of RF heating is shown by the time required for the samples to boil or to rise to the indicated temperature Table 3 Selected Test Tube Experiments with Potential Susceptors Table 3 Selected Test Tube Experiments with Potential Susceptors These tests show that, as expected, aqueous solutions of various susceptors, such as salts, coupled very well with the RF energy. All tested susceptor compositions came to a boil within 3 - 30 seconds. As discussed above, SnCl 2 dissolved in NMP also coupled very effectively. Although a boiling time of 47 seconds is shown in this experiment, the temperature of 350 °F reached by this mixture is substantially higher than is required for heat bonding polyolefins. In the section on nonaqueous solutions in Table 3, it can be seen that while NMP is only a weak susceptor in its own right, it couples very effectively with the RF energy, when a variety of salts are dissolved in it. It was also observed that the solution's ability to solubilize salts seems to be enhanced when PVP is dissolved in it. Since the compositions shown in Table 3 were not optimized, the RF heating capability ofthe solutions appear to be very good. The last section of Table 3 shows the RF heating capability of some liquid polymers. They range from very mild coupling ability to very powerful coupling ability in the case of MICHEM ACRYLIC 1 (available from Michelman Corporation), a styrenated ethylene-acrylic acid polymer. Example 5 This experiment tested the compatibility of various film forming and adhesive polymers with modifying resins and additives and with inorganic or organic susceptors (in constituent concentrations consistent with the parameters described above). A series of experiments were conducted with low-density polyethylene (LDPE) as the substrate, as summarized in Table 4. Table 4 Bonding Feasibility Experiments With a Low Density Polyethylene Substrate Table 4 Bonding Feasibility Experiments With a Low Density Polyethylene Substrate Several susceptors which had been very effective in test tube runs did not always lead to good bonding or adhesion in these trials MICHEM ACRYLIC 1 is a good example Likely reasons include (a) the susceptors were only effective wet and lost their coupling ability when used in a dry film, or (b) the susceptor itself was not a good adhesive and formed a barrier to melted PE bonding to itself There was an indication that the second reason prevailed when it was shown that the susceptors performed better when blended with PE or EVA which could act as hot melt adhesives for the substrates Better results were obtained with MICHEM PRIME 4983 and 4990, MICHEM ACRYLIC 1 and UNI-REZ 2641 in combination with either PE or EVA However, N,N-ethylene-bιsstearamιde, which was described in the Degrand reference, was not very effective in these experiments A number of trials provided partial adhesion, as noted in Table 4, which were likely caused by the inability ofthe film holder to clamp the substrates tightly and flat Although the shortest successful heating times were on the order of 10 to 15 seconds, which would be too long for a commercial operation, the results are positive, in that both the adhesive compositions and the operation of the film station can be further optimized without undue experimentation Example 6 Another series of experiments were performed with other polyolefm substrates, including a PP non-woven These trials are summarized below in Table 5 Very good bonds were obtained with several compositions at dwell times down to about 1 second While this may be too long for some commercial applications, it is highly encouraging for trials that were not optimized with regard to either the susceptor composition or the test equipment Table 5 Bondin Ex eriments With Polyolefm Substrates Some of the better results were obtained with compositions containing PVP or PVP/VA and SnCl 2 salt dissolved in NMP (in constituent concentrations consistent with those discussed above) It was shown, however, that thorough drying ofthe susceptor composition eliminated its ability to couple with the RF field It appears that the mobility, provided by the presence of at least a small amount of NMP solvent, is important for efficient coupling to the applied RF field This mobility function can be provided by the selection of an appropriate nonvolatile plasticizer, such as epoxidized oils, polyhydπc alcohols, substituted amides, sulfonamides, aryl and alkyl aryl phosphates, polyesters and a wide variety of esters, including benzoates, phthalates, adipates, azelates, citrates, 2- ethylbutyrates and hexoates, glyceπdes, glycollates, myπstates, palmitates, succinates, stearates, etc Plasticizers are used to solvate a material, and thus improve its molecular mobility if it has become too rigid In general, ethylene co-polymers with functionality providing (a) enhanced compatibility and (b) ionic or highly polar constituents are effective in bonding or adhering substrates, together with salts that are either soluble or readily dispersed m the polymer matrix There is also evidence that in some compositions mobility of the dipoles must be assured This was achieved in the presence of such high- boiling solvents as NMP It can also be extrapolated that other high boiling solvents or non-volatile plasticizers can achieve the same effects with more reproducible results These example susceptor compositions utilize a combination of polar components and hydrated salts in a polymer matrix plasticized with high boiling and high dielectric constant additives that are activatable at a relatively low frequency of about 15 MHz The methods and experiments set forth above will allow those of skill in the art to determine without undue experimentation that a particular mixture would be suitable for bonding or adhering substrates according to the present invention Example 7 This example demonstrates RF-heatable thermoplastic compositions derived from the combination of various ion-containing polymers with glycerin. These compositions are shown to be significantly more susceptible to RF heating than either the component ion-containing polymers or glycerin are by themselves. Example 7a Several compositions comprising 70 wt% sulfonated polyesters in 30 wt% glycerin were prepared. Each sample was prepared by first mixing 14 grams of sulfopolyester material with 6 grams of glycerin in a 60 milliliter glass jar The open topped jar was heated in a convection oven at 165C for 1 hour After thirty minutes, the composition was removed from the oven and hand stirred for 1 minute and then immediately returned to the oven. After an additional 30 minutes of heating at 165C, the composition was removed from the oven and hand stirred for 1 minute. While the composition was still molten, it was hand-drawn into a 1 inch wide by 3 inch long by 0.006 inch thick coating on the surface of a 0.004 inch thick sheet of transparency film (PP2500 series 3M transparency film) that was supported on a 180° F 10 inch x 10 inch Corning model PC620 hot plate Immediately after the composition was coated to the film, the coated film was removed from the hot plate and allowed to cool to room temperature The samples were then evaluated for film properties and RF heating The RF equipment setup used for testing this example and examples 8- 16 consisted ofthe RF probes described in Figure 42 and the RF equipment described in Figure 41 Unless otherwise noted, in each case a 1 -inch x 3 -inch sample (410) was placed over the RF probes as shown in Figure 41 The distance from the surface of the probes to the sample was about 0 016 inches The sample was heated at about 1 KW input power into the tuned heat station 4122 (or impedance matching circuit 4122) at about 13 5 MHz for the time required to cause observable heating and melting in the activation region ofthe RF probes Table 6 Example 7b Several compositions comprising 70 wt% ethylene acrylic acid copolymers in 30 wt% glycerin were prepared Each sample was prepared by first mixing 52 grams of ethylene acrylic acid copolymer material (a 25 wt% solids emulsion) with 5 57 grams of glycerin in a 60 milliliter glass jar. The combined materials were then mixed for 10 minutes to result in an emulsion The resulting emulsion was then cast onto a sheet of 0 004 inch thick transparency film (PP2500 series 3M transparency film) at room temperature The cast emulsion was then allowed to dry-down under a heat lamp to form a film The samples were then evaluated for film properties and RF heating Table 7 Example 7c Several compositions comprising 70 wt% vinyl acetate acrylic copolymers in 30 wt% glycerin were prepared Each sample was prepared by first mixing 46 67 grams of vinyl acetate acrylic copolymer material (a 55 wt% solids emulsion) with 3 grams of glycerin in a 60 milliliter glass jar The combined materials were then mixed for 10 minutes to result in an emulsion The resulting emulsion was then cast onto a sheet of 0 004 inch thick transparency film (PP2500 series 3M transparency film) at room temperature The cast emulsion was then allowed to dry-down under a heat lamp to form a film The samples were then evaluated for film properties and RF heating Table 8 Example 7d This example demonstrates how the addition of glycerin as well as adjustments in pH to gelatin solutions can affect the properties of derived gels Several compositions were prepared as solutions of a commercially available gelatin (Eastman 45 Y56-853-3 V0-6CS available from Eastman Gelatine Corporation) All compositions had water Some solutions had glycerin added to them Some solutions had their pH adjusted by the addition of 1 ON NaOH or 6N HCl The compositions were prepared as follows Composition #1 was prepared by adding 70 grams of gelatin to 280 grams of water and stirring and heating the resulting mixture at about 65°C for 1 hour to obtain a solution The solution had a pH of 6 18 at 65°C Composition #2 was prepared by stirring 6 grams of glycerin into 70 grams of composition #1 The solution had a pH of 5 8 at 65°C Composition #3 was prepared by stirring drops of ION NaOH (about 25 drops) into 125 mis of composition #1 , until the resulting solution had a pH of 10 1 at 65°C Composition #4 was prepared by stirring 8 1 grams of glycerin into 99 3 grams of composition #3 to result in a solution with a pH of 10.1 at 65°C. Composition #5 was prepared by stirring drops of 6N hydrochloric acid (about 90 drops) into 125 grams of composition #1, until the resulting solution had a pH of 1.9 at 65°C. Composition #6 was prepared by stirring 5.361 grams of glycerin into 62.57 grams of composition #5 to result in a solution with a pH of 1.9 at 65°C. Each gelatin solution was cast onto a sheet of transparency film (3M PP2500 Transparency Film) and allowed to set-up at room temperature to form a gel film. The gels differed in their film properties and in their RF-heating properties as described in Table 9. Gelatin films (susceptors) may not act as a good adhesive on low energy surfaces, such as PE, PP, etc. However, the are expected to perform effectively as adhesives on polar substrates, such as paper, Kraft paper, linear boards, wood, etc. Table 9 Example 8 Several compositions were prepared by mixing various polar materials with a representative ionomer (Eastman AQ35S Sulfopolyester) In each case, the compositions are demonstrated to be more susceptible to RF heating than the component ionomer or polar material by themselves Each composition is comprised of 70 wt% AQ35S in 30 wt% polar material Each sample was prepared by first mixing 46 67 grams of AQ35D (a 30 wt% solids emulsion) with 6 grams of polar carrier in a 60 milliliter glassjar The combined materials were then mixed for 10 minutes to result in an emulsion The resulting emulsion was then cast onto a sheet of 0 004 inch thick transparency film (PP2500 series 3M transparency film) at room temperature The cast emulsion was then allowed to dry-down under a heat lamp to form a film The samples were then evaluated for film properties and RF heating Table 10 55 Example 9 Thermoset polymers are a class of polymeric systems formed by chemical (usually covalent bonding) reaction of lower molecular weight functional building blocks For instance, epoxy thermoset polymers are formed by the reaction of oxirane groups of epoxy compounds with other functional groups such as hydroxyl, carboxyl, amine etc In the case of urethanes, isocyanate groups are reacted with functional groups such as amines, hydroxyls etc. Chemical reactions ofthe functional groups ofthe building blocks typically need energy source such as heat, radiation and presence of catalyst The reaction product resulting from such an interaction leads to crosslinking between the functional groups of the building blocks which in turn gives a cured polymeric system with many desirable properties such as improved heat, chemical and solvent resistance, enhanced strength and mechanical properties etc A key feature of thermoset systems is the fact that once the crosslinks are formed in the cured state it is very difficult to reverse it A convenient way to study the crosslinking reaction in a thermoset system is to follow the gelling reaction. At the start ofthe crosslinking reaction, viscosity ofthe initial reaction mixture is low. In the presence of appropriate catalyst and energy source, chemical crosslinking starts to take place with increase in molecular weight and viscosity. After a critical stage ofthe crosslinking reaction has taken place, the system sets up to an insoluble (in a solvent such as MEK in which the starting compounds are soluble) gel . Physico-chemically, chemical bonds are being formed leading to a network structure ofthe cured system. It has been shown that many ofthe properties of a thermoset system (such as glass transition temperature, solvent and chemical resistance, mechanical properties etc) can be readily correlated to the gel content ofthe system The degree of cross linking of various thermoset systems was assessed by measuring the gel content of formulation after exposure to RF field to different time and energy levels Increase in gel content of a given composition after RF exposure (compared to the gel content of the same composition after air drying for several hours) is taken as a measure of cure ofthe thermoset system Typical gel measurements were carried out as follows A sample of the formulation is applied to a glass slide The sample is air dried for a 1-2 hours so the applied layer is dry to touch Sample weight is noted as "A" after taking into account the tare weight of glass slide Then it is exposed to RF source (in the case of control experiments, the sample is put in a conventional laboratory oven at a set temperature and time) The cured sample is cooled down to ambient temperature The glass slide containing the cured sample is dipped in 40ml of MEK for 10 minutes The slide is taken out and air-dried prior to weighing. Sample weight is noted as B. % Gel content is calculated as (B/A) x 100 It is worth noting that gel content as measured by the above procedure gives only the initial cure state of the thermoset system Typically, crosslinking reaction progress further upon aging leading to a higher cured state of thermoset system. In the following experiments, the following materials were used Epon 828: Diglycidyl ether of bisphenol-A from Shell Chemicals. Ancamine 2441 catalyst, a modified polyamine from Air Products & Chemicals Inc. EpiRez dispersion, a bisphenol A based epoxy dispersion from Shell Chemicals. Epicure 8536-MY60, an amine curing agent from Shell Chemicals. Maincote Hydur, a self-reactive acrylic emulsion from Rohm & Haas. Aropol 7241, an isophthahc polyester (unpromoted) from Ashland Chemical. Kelsol 5293, a water dispersible polyester from Reichhold Cymel 385, butylated urea formaldehyde resin from Cytec Industries. Desmodur-W, an aliphatic diisocyanate {CAS #5142-30- 1 , (4- isocyanatocyclohexyl) methanejfrom Bayer Formrez 1 1-36, a polyester diol from Witco T-12 catalyst, dibutyltindilaurate from Air Products & Chemicals inc Eastman A 35 D sulfonated branched polyester from Eastman Chemicals A. Epoxy Resins Epoxy resins are typically cured to a thermoset state by application of heat in the presence of catalysts such as amines, acids, anhydrides etc By proper selection of epoxy resin, catalyst (amine, acid etc ) and optionally a polar carrier such as water, glycerin and similar high dielectric constant liquids, it is possible to formulate RF cured thermoset epoxy systems of potential interest in diverse applications such as adhesives and coatings for conventional and spray applications on plastics, metals, wood, etc, corrosion resistant coatings, industrial and protective coatings, top coats, automotive coatings, lamination of composites, laminating adhesives, bonding of structural composites, inks and decorative coatings, barrier coatings, etc The effect of time and temperature on some thermally cured epoxy resin systems using typical cure conditions is shown in this example The composition included Epon 828 resin 3 parts Ancamine 2441 catalyst 0 3 parts The above composition was air dried without any heat and the gel content measured It was found to be zero showing that the resin is not cross-linked to a cured system The above composition was heated to 130 deg C for 5 minutes and the gel content of the sample was found to be 1 1% This shows that there is some crosslinking occurring under this condition The above composition was heated to 130 deg C for 15 minutes and the gel content was found to be 48%o As expected, longer exposure to higher temperature increases crosslink density and gel content The above composition was heated to 120 deg C for 20 minutes and the gel content was found to be 42 5% This shows that longer exposure time at a lower temperature compared to previous experiment did not increase gel content From this observation, one can conclude that temperature has a more significant influence on crosslink density and gel content ofthe system The above composition was exposed to 120 deg C for 30 minutes and the gel content was found to be 73.5% The main conclusion from the above experiments is that a fairly long time (order 30 minutes) is needed to reach a high gel content thermoset epoxy resin system, cured by conventional thermal energy In the next series of experiments, similar epoxy compositions were evaluated when exposed to RF (14 7 MHz) for various lengths of time and energy The composition included. Epon 828 2 1 Parts Ancamine 2441 0.5 parts The above composition was air-dried and the gel content of the dried sample was found to be 10 7%. This shows that there is a very small level of gel in the air-dried (1 hour) sample 10%) Glycerin was added to the above composition and the sample air- dried for 1 hour and its gel content was found to be 4.3%>. This data shows that glycerin tends to solubilize the gel under air dry condition. The above composition (without glycerin) was applied onto a glass slide and was exposed to 500 mv for 2.5minutes and its gel content was found to be 8.5%. This shows that there is not much activation under this level of RF energy. The 10% glycerin composition was applied to a glass slide and the sample was exposed to 500 mV for 2 5 minutes. Gel content ofthe sample was found to be 77.3% This result shows that addition of glycerin enhances the RF susceptibihty of the resin and high level of crosslinking is achieved These experiments clearly show that epoxy resins can be activated in a very short period of time (compared to thermal curing conditions), especially in the presence of a polar carrier such as glycerin In the next series of experiments, another type of epoxy and curing agent was tested The composition included Epi-Rez 3520-WY-55 2 parts Epicure 8536-MY60 1 parts The above composition was applied to a glass slide and activated under 100 mV for 5 minutes No heat was noted and the gel content was found to be 19 3% The same composition was activated under 500 mV for 5 minutes Gel content was found to be 52 5%> This shows that higher power compared to first experiment is needed for crosslinking to take pace 10% Glycerin was added to the above composition and the sample, after drying on a glass slide, was activated for 5 minutes under 500 mV The gel content was found to be 52 4%, which is very similar to what was obtained without any glycerin This result shows that the presence of glycerin or other carrier is not necessary for RF activation in all cases, especially if the resin system is water based such as the Epi Rez resin B. Acrylic system: In this series of experiments, the use of RF activation for an acrylic class of resin is demonstrated Maincote Hydur 30, a water based acrylic emulsion with carboxyl and unsaturation functionalties from Rohm and Haas was tested The sample was air- dπed and its gel content was found to be 37% This result shows that the unsaturation in the acrylic resin results in some crosslinking due to air oxidation, as seen in drying oils and alkyd resins 10% glycerin was added to Maincote Hydur 30 and the gel content ofthe air dried sample was found to be 4 6% This result shows that glycerin acts as good solvent for the air-dried sample Maincote Hydur 30 was applied to a glass slide and the sample exposed to 500 mV for 2.5 minutes The gel content was found to be 61 5% This clearly shows that RF field activates the acrylic resin leading to high levels of crosslinking 10% Glycerin/Maincote Hydur 30 was exposed to 500 mV for 2 5 minutes The gel content was found to be 92 3% This result shows that presence of glycerin promotes RF coupling with the resin Maincote Hydur 30 was exposed to 700 mV for 2 5 minutes and the gel content was found to be 81 8% This shows that increased RF power promotes crosslinking of acrylic resin 10% Glycerin/Maincote Hydur 30 was exposed to 700 mV for 2 5 minutes and the gel content ofthe sample was found to be 100% This result shows the beneficial role of glycerin in promoting RF activation of acrylic resin The next experiment is a comparative example showing thermal curing of acrylic resin Maincote Hydur was heated to 100 deg C for 5 minutes and the gel content was found to be 93% Note that gel content of RF activated sample is higher even though it was exposed only for half the duration to energy This series of examples show that functionalized acrylic polymers can be activated under RF energy C. Polyester Resin: In this series of experiments, the RF response of polyester/ vinyl ester resins was studied Aropol 7241 , an isophthahc polyester resin from Ashland Chemical, was applied to a glass slide and the dried sample was exposed to RF field at 500 mV and 5 minutes. The gel content was found to be 51.3%>. This result shows that RF energy can activate an isophthahc polyester resin Kelsol 5293, a polyester dispersion from Reichhold Chemicals, was tested in this example The composition included Kelsol 5293 2 parts Cymel 385 crosslinker 0 6 parts The composition was exposed to RF for 2 5 minutes at 500 mV The gel content was found to be 8 5% 10% glycerin was added to the composition and exposed to RF for 2 5 minutes at 500 mV The gel content was found to be 21 9% This shows that addition of glycerin promotes RF activation The above composition (without glycerin) was exposed to 700 mV for 2 5 minutes and the gel content was found to be 73 7% This result shows that exposure to higher RF field leads to higher gel content The composition comprising 10%> glycerin was exposed to 700 mV for 2 5 minutes and the gel content was found to be 59 5% These experiments show that RF energy can be used to activate polyester type resins D. Urethanes: A linear polyurethane composition based on Desmodur-W (an aliphatic diisocyanate from Bayer) and Formrez 1 1-36 (a polyester diol from Witco) was evaluated The composition included Desmodur W 0 75 parts Formerez 1 1-36 3 2 parts T-12 catalyst from Air Products & Chemicals 1 -2 drops A glass slide containing the above composition was exposed to 700 mV RF field for 5 minutes and the gel content was measured to be 1 1 4% (Note At 500 mV, the gel content was zero for 2 5 and 5 minute exposures without glycerin and 1 3% and 8 3% for 2 5 and 5 minute exposures with 10% glycerin) 10% Glycerin was added to the above composition and the RF activation repeated under the same conditions (700 mV and 5 minutes) The gel content was found to be 27% This level of gel content is quite good for a linear polyurethane This result shows that addition of glycerin promotes urethane reaction and gel formation It is very likely that hydroxyl groups present in the glycerin molecule is acting as reactive polyol in the formation of urethane It may be possible to increase the gel content by increasing the ratio of isocyanate in the formulation relative to polyol It may also be possible to increase the gel content of the composition by partially replacing the diisocyanate (Desmodur W) and polyester diol (Formerez 1 1-36) with multifunctional isocyanate such as polymeric MDI (methylene bisdiphenyldisocyanate) and tnols Use of multifunctional isocyanate and polyol should significantly increase gel content close to 100% Use of isocyanate terminated prepolymer of higher molecular weight (8,000-10,000) m the urethane reaction may also increase gel content ofthe system Example 10. Effect of "susceptor" addition on RF activation of acrylic and polyesters. The effect of adding 4-styrene sulfonic acid, Na salt, vinyl sulfonic acid, Na salt and A 35 D sulfonated polyester from Eastman Chemicals on RF activation of acrylic and polyester resins was evaluated A first composition included Maincote Hydur- 95 parts 4-styrene sulfonic acid, Na salt 5 parts The above composition was evaluated as described in previous examples at 700 mV and 2 5 minutes The gel content was found to be 45 5% Gel content ofthe sample without 4-styrene sulfonic acid, Na salt, under the same conditions was found to be 81 8% (see above) 10% Glycerin was added to the above composition and the sample evaluated under 700 mV and 2 5 minutes exposure conditions The gel content was found to be 66 7% Gel content of the sample without susceptor was 100% (see above) This result shows that styrene sulfonate, Na salt does not promote the RF activation of acrylic resin, with and without glycerin A second composition included Kelsol 5243 polyester 2 parts Cymel 0 6 parts Vinyl sulfonic acid, Na salt At 25% in water 0 5 parts The above composition was evaluated as before at 700 mV and 2 5 minutes The gel content was found to be 67 2% Similar composition without susceptor had a gel content of 73 7% (see above) This result shows that addition of vinyl sulfonic, Na salt, does not promote RF activation of polyester resin 10% Glycerin was added to the above composition The resultant composition was evaluated as before under 700 mV and 1 second RF field The sample became too hot and burst into flames The result shows that glycerin does activate under high field and it is possible to get high degree of crosslinking reaction under very short times, say less than 1 second A third composition included Maincote Hydur acrylic lpart Eastman AD 35 D polyester susceptor 1 part The above composition was evaluated as before and the gel content was found to be 79 2%> at 700 mV and 2 6 minutes The same composition without the susceptor had a gel content of 81 8% at 700 mV and 2 5 minutes exposure (see above) In this case addition of a susceptor does not have any effect on RF activation of acrylic polymer 10% Glycerin was added to the third composition which was exposed to 700 mV for 2 minutes This exposure led to a very violent reaction This shows that susceptor was too active The third composition was exposed to 500 mV for 5 minutes Gel content was found to be 68 4% A comparable sample without the addition of susceptor was found to give a gel content of 61 5% after 2 5 minutes exposure (see above) The result shows that the susceptor had very little effect The third composition comprising 10% glycerin was evaluated at 500 mV and 5 minutes The gel content was found to be 69 7% The same sample with out susceptor had a gel content of 92 3% at 500 V and 2 5 minute exposure (see above) The result shows that the addition of susceptor had a negative effect on RF activation It appears addition of known susceptors to the various thermoset resin compositions has very little impact on RF activation ofthe resins In some cases, it seems to have a negative impact In a few cases, the heat generation is quite violent suggesting that proper tuning of frequency/ power/ time and other variables will lead to conditions that would allow very short cure times Example 14 The use ofthe carboxyl containing diol dimethylol butanoic acid was tested as a susceptor The composition included Formerez 1 1-36 3 2 parts Desmodur W 0 75 parts Dιmeth\ lol Butanoic acid 0 28 parts T-12 catalvst 1-2 drops No significant activation took place when this composition was exposed to 500 mV level (2 5 and 5 minute exposure) At 5 minute exposure under 700 mV , the glass slide broke and no data could be gathered As noted above, under similar conditions without the susceptor, a gel content of 1 1 4% was obtained in the absence of glycerin and 27% in the presence of glycerin It may be useful to add the acid diol in N-methyl pyrrohdone or another polar solvent and neutralize with a tertiary amine to protonate the acid Further use of urethane prepolymer containing carboxyl or sulfonate groups in the presence of a tertiary amine (to protonate the acid) may be a better susceptor candidate for the urethane reaction Example 15 This example demonstrates a method of selectively activating the compositions ofthe invention within a multi-layer stack of materials The composition comprised 70 wt%> Eastman AQ35S sulfopolyester in 30 wt% glycerin. The composition was applied and dried down from an aqueous dispersion to form a continuous 0 003 inch thick film on one side of a bilaminate polyolefm material. The bilaminate polyolefm material comprised a single layer of polypropylene (PP) non-woven material bonded to a single layer of polyethylene (PE) film The composition was coated onto the PP side of the bilaminate material The coated bilaminate material was then interposed between two multi-layer stacks of un-coated bilaminate material to form a composite sandwich of materials. Each multi-layer stack had two layers of the un-coated bilaminate polyolefm material The composite sandwich (410) was then placed directly over the RF probes and compressed under a TEFLON block at 30 psi The composition was RF heated by applying approximately 1 kW of forward power into the tuned heat station 4122 for 200 milliseconds at approximately 13.5 MHz After applying the RF energy to the composite sandwich, the pressure was removed and the sandwich was evaluated by slowly pulling the layers apart by hand. Every layer was easily pulled apart, with no observed bonding, except for the two layers that were in direct contact with the bonding composition. The two layers that were in direct contact with the bonding composition were firmly adhered by the bonding composition. As a control experiment, the experiment was repeated, except that no RF energy was applied to the composite sandwich. This experiment resulted in no observable bonding between any of the layers, including the two layers that were in direct contact with the bonding composition. It should be understood that in this experiment, the bonding composition was pre- applied to one surface of one of the layers of the composite sandwich. The bonding composition could be applied to more than one surface of more than one layer. Bonding would occur between any layers that are each in contact with a given layer of bonding composition. Example 16 This example demonstrates the method of interfacing a carrier layer onto the surface of a susceptor layer to achieve an RF heatable composition. First, a 0.003 inch layer of a sulfonated polyester copolymer, Eastman AQ35S (Supplied by Eastman Chemical Company, Kingsport, TN) was coated out of an aqueous dispersion onto the polypropylene (PP) non-woven side of a bilaminate web consisting of a layer of PP non-woven bonded to a layer of polyethylene (PE) film. The coating was thoroughly dried down under a heat lamp and fan. A sandwich was made by placing a sample ofthe coated web against the PP side of a second piece ofthe same web material which was not coated, such that the coating was between the two webs. The sandwich was placed directly over the RF probes (410) of the RF set-up described in Figure 41. The distance between the RF probes and the sandwich was about 0.010 inch. The sandwich layers were pressed firmly together against the RF probes with 35 psi of applied pressure. About 1 kW of 13.5 MHz RF energy was applied for 500 milliseconds and resulted in no noticeable heating or bonding between the webs. Then the sandwich layers were separated and the susceptor coating was moistened with distilled water. The sandwich was re-assembled and RF energy was applied to it for 500 milliseconds as described above, resulting in very good bonding of the webs As a control experiment, a sandwich consisting of two webs ofthe un-coated web material was prepared by moistening the PP side of each web and bringing the water moistened surfaces together RF energy was applied for 500 milliseconds to the sandwich in the same way described above, resulting in no noticeable heating While various embodiments ofthe present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation Thus, the breadth and scope of the present invention should not be limited by any ofthe above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents Additionally, all patents, patent applications and publications mentioned above are incorporated by reference herein.

Claims: Wliat Is Claimed Is: 1 A composition for use in adhesion or bonding, comprising a susceptor, and a polar carrier, wherein said susceptor and/or said polar carrier are present in amounts effective to allow said composition to be heated by radio frequency (RF) energy, with the proviso that said susceptor is not a quaternary ammonium salt 2 A composition for use in coating, comprising a susceptor, and a polar carrier, wherein said susceptor and/or said polar carrier are present in amounts effective to allow said composition to be heated by RF energy, with the proviso that said susceptor is not a quaternary ammonium salt 3. A composition for use in adhesion, bonding or coating, consisting essentially of: a susceptor; and a polar carrier, wherein said susceptor and/or said carrier are present in amounts effective to allow said composition to be heated by RF energy. 4. The composition of any one of claims 1-3, wherein the susceptor and the carrier are substantially blended with one another and form a mixture 5. The composition of any one of claims 1 -3, wherein the susceptor and the carrier are disposed on one another. 6. The composition of any one of claims 1-3, wherein the susceptor is an ionic compound. 7 The composition of any one of claims 1 -3 , wherein the susceptor is a polar compound having a sufficiently high dipole moment that moleculai oscillations or vibrations ofthe compound occur when exposed to RF energy 8 The composition ofany one of claims 1 -3, further comprising or consisting essentially of an adhesive compound, wherein said adhesive compound, said susceptor and said polar carrier are blended substantially with one another to form said mixture 9 The composition of claim 8, wherein said adhesive compound and said susceptor are an ionomer 10 The composition of claim 8, wherein said adhesive compound is polyvinylpyrrohdone (PVP) in a concentration of from about 10 (weight) % to about 35% and said polar carrier is N-methylpyrrohdone (NMP) in a concentration of from about 1% to about 60% 1 1 The composition of claim 8, wherein said adhesive compound is PVP/vinyl acetate copolymer in a concentration of from about 10% to about 35% and said polar carrier is NMP in a concentration of from about 1%> to about 60% 12 The composition of claim 8, wherein said adhesive compound comprises or consists essentially of an aqueous dispersion of a branched polyester adhesive 13 The composition of claim 12, wherein said branched polyester adhesive is present in a concentration from about 25% to about 75% 14 The composition of claim 12, wherein said susceptor comprises or consists essentially of an ionic salt incorporated into the aqueous dispersion 15 The composition of claim 14, wherein said ionic salt is stannous chloride (SnCl 2 ) at a concentration from about 1% to about 50% 16 The composition of claim 8, wherein said adhesive compound comprises or consists essentially of a solution of a non-aqueous polar carrier and a branched polyester adhesive 17 The composition of claim 16, wherein said branched polyester adhesive is present in a concentration of about 25% to about 75% 18 The composition of any one of claims 1 -3, wherein said susceptor comprises or consists essentially of a non-ferromagnetic ionic salt 19 The composition of claim 18, wherein said non-ferromagnetic ionic salt is SnCl 2 at a concentration of from about 1%> to about 50% 20 The composition of any one of claims 1 -3, wherein said susceptor comprises or consists essentially of an aqueous dispersion of a sulfopolyester adhesive 21 The composition of claim 20, wherein said sulfopolyester adhesive is present at a concentration of from about 5% to about 75% 22 The composition of any one of claims 1-3, wherein said susceptor is one or more ionic salts and is present in the form of a precipitate 23 The composition of any one of claims 1-3, wherein said susceptor is an lonomenc polymer 24 The composition of claim 23, wherein said lonomenc polymer is a sulfonated polyester or copolymer thereof, or salt thereof 25 The composition of claim 23, wherein said lonomenc polymer is the sodium salt of a sulfonated polyester 26 The composition of claim 23, wherein said ionomeric polymer is a acrylic acid polymer or copolymer, or a salt thereof 27 The composition of claim 23, wherein said ionomeric polymer is gelatin 28 The composition of claim 27, wherein said gelatin has a pH of about 8 to 12 29 The composition of claim 27, wherein said gelatin has a pH of about 1 to about 6 30 The composition according to any one of claims 1 -3, wherein said polar carrier is a polyol 31 The composition according to claim 30, wherein said polyol is selected from the group consisting of ethylene glycol, 1,2-propylene glycol, 1,3- propanediol, 2,4-dimethyl-2-ethylhexane-l,3,diol, 2,2-dimethyl-l ,3-propanediol, 2-ethyl-2-butyl-l,3-propanediol, 2-ethyl-2-isobutyl- 1 ,3-propanediol, 1 ,3- butanediol, 1 ,4-butanediol, 1 ,5-pentanediol, 1,6-hexanediol, 2, 2-4-trimethyl- 1,6- hexanediol, thi odi ethanol, 1 , 2-cyclohexanedimethanol , 1 , 3 - cyclohexanedimethanol, 1 ,4-cyclohexanedimethanol, 2,2,4,4-tetramethyl-l,3- cyclobutanediol, and p-xylylenediol 32 The composition according to claim 30, wherein said polyol is glycerin 33 The composition according to claim 30, wherein said polyol is a polyvinyl alcohol. 34 The composition according to any one of claims 1 -3, further comprising or consisting essentially of a thermoplastic polymer 35 The composition according to any one of claims 1-3, further comprising or consisting essentially of a thermoset resin 36 The composition according to any one of claims 1 -3 wherein the composition is substantially transparent or translucent 37 The composition of any one of claims 1 -3, further comprising an insoluble porous carrier saturated with said composition 38 The composition of claim 37, wherein said insoluble porous carrier is a thermoplastic web 39 The composition of claim 38, wherein said insoluble porous thermoplastic carrier web is a non- woven polypropylene (PP) 40 The composition of claim 37, further comprising a first polyolefin layer and a second polyolefin layer disposed on said insoluble porous carrier, wherein said first and second polyolefin layers are bonded or adhered to the porous carrier by RF heating 41 A method of bonding or adhering a first substrate to a second substrate, comprising interposing a composition between the first and second substrates, said composition comprising a susceptor and a polar carrier, wherein said carrier and said susceptor are blended substantially with one another and form a mixture, and wherein said susceptor and/or said carrier are present in amounts effective to allow said composition to be heated by RF energy, and applying RF energy to said composition to heat said composition, thereby causing the first and second substrates to become adhered or bonded, with the proviso that said susceptor is not a quaternary ammonium salt 42 The method of claim 41, wherein said RF energy has a frequency in the range of from about 100 kilohertz to about 5 0 Gigahertz 43 The method of claim 41 , wherein said RF energy has a frequency in the range from about 10 megahertz to about 30 megahertz 44 The method of claim 43, wherein said RF energy has a power of about 0 1 kilowatts to about 5 kilowatts 45 A method of bonding or adhering a first substrate to a second substrate in less than about one second, comprising interposing a composition between the first and second substrates, said composition comprising a susceptor and a polar carrier, wherein said carrier and said susceptor are blended substantially with one another and form a mixture, and wherein said susceptor and/or said carrier are present in amounts effective to allow said composition to be heated by RF energy, and applying RF energy to said composition to heat said composition, thereby causing the first and second substrates to become adhered or bonded in less than about 1 second 46 The method of claim 45, wherein said composition melts or flows and said first and second substrates becomes bonded or adhered in about 100 milliseconds to about 1 second 47 The method of claim 41 or 45, wherein said interposing further comprises coating at least one ofthe first and second substrates with said composition, and placing the first and second substrates in contact with a uniform pressure applied to the first and second substrates 48 The method of claim 41 or 45, wherein said interposing comprises interposing said composition between a first multilayer stack ofthe first substrate and a second multilayer stack ofthe second substrate 49 The method of claim 41 or 45, wherein the first and second substrates are selected from the group consisting of film, non-woven, or foamed PP, and film, non-woven, or foamed polyethelene (PE) 50 The method of claim 41 or 45, wherein said interposing comprises interposing a composition between the first and second substrates, said composition comprising said susceptor, said polar carrier, and an adhesive compound, wherein said polar carrier, said adhesive compound, and said susceptor are blended substantially with one another and form said mixture 51 The method of claim 41 or 45, wherein said susceptor is an ionomeric adhesive 52 The method of claim 51 , wherein said ionomeric adhesive is a sulfonated polyester or copolymer thereof, or a salt thereof 53 The method of claim 51, wherein said ionomeric adhesive is gelatin 54 The method of claim 53, wherein said gelatin has a pH of about 8 to 12 55 The method of claim 53, wherein said gelatin has a pH of about 1 to 6 56 The method of claim 51 , wherein said ionomeric adhesive is a polyacryhc acid polymer or copolymer thereof, or a salt thereof 57 An adhered composition obtained according to the method of claim 41 or 45 58 A bonded composition obtained according to the method of claim 41 or 45 59 A method of bonding or adhering a first substrate to a second substrate, comprising applying a first composition onto the first substrate, applying a second composition onto the second substrate; contacting said first composition with said second composition; applying RF energy to said first and second compositions to heat said compositions, thereby causing the first and second substrates to become adhered or bonded, wherein one of said compositions comprises a susceptor and the other of said compositions is a polar carrier, and the susceptor and/or the carrier are present in amounts effective to allow said first and second compositions to be heated by RF energy 60 The method of claim 59, wherein the susceptor is an ionic compound 61 The method of claim 59, wherein the susceptor is a polar compound having a sufficiently high dipole moment that molecular oscillations or vibrations ofthe compound occur when exposed to RF energy. 62 The method of claim 59, wherein said susceptor is not a quaternary ammonium salt 63 A kit for adhering or bonding a first substrate to a second substrate, comprising one or more containers, at least one of said containers comprising a susceptor composition, said susceptor composition comprising a susceptor and a polar carrier substantially uniformly dispersed in one another to form a mixture, wherein said susceptor and/or said carrier are present in amounts effective to allow said composition to be heated by RF energy 64 A kit for adhering or bonding a first substrate to a second substrate, comprising at least two containers, wherein one of said containers comprises a susceptor and another of said containers comprises a polar carrier wherein when said susceptor and said carrier are applied to at least one of said first and second substrates and said susceptor and carrier are interfaced, a composition is formed that is heatable by RF energy 65 The kit of claim 63 or 64, wherein said susceptor is an ionomeric polymer 66 The kit of claim 65, wherein said ionomeric polymer is a sulfonated polyester or copolymer thereof, or a salt thereof 67 The kit of claim 65, wherein said ionomeric polymer is an acrylic acid polymer or copolymer thereof, or a salt thereof 68 The kit of claim 65, wherein said ionomeric polymer is gelatin 69 The kit of claim 68, wherein said gelatin has a pH of about 8 to 12 70 The kit of claim 68, wherein said gelatin has a pH of about 1 to 6 71 The kit of claim 63, wherein at least one of said containers further comprises an adhesive compound, and wherein said polar carrier, adhesive compound, and susceptor are substantially uniformly dispersed in one another and form a substantially uniform mixture 72 The kit of claim 63 or 64, wherein the susceptor is an ionic compound 73 The kit of claim 63 or 64, wherein the susceptor is a polar compound having a sufficiently high dipole moment that molecular oscillations or vibrations ofthe compound occur when exposed to RF energy 74 A method of making a composition for bonding or adhering, comprising admixing a susceptor and a polar carrier, wherein said polar carrier and said susceptor are substantially uniformly dispersed in one another and form a mixture, and wherein said susceptor and/or said carrier is present in amounts effective to allow said composition to be heated by RF energy 75 The method of claim 74, wherein susceptor is an ionomeric polymer 76 The method of claim 75, wherein said ionomeric polymer is a sulfonated polyester or copolymer thereof, or a salt thereof 77 The method of claim 75, wherein said ionomeric polymer is an acrylic acid polymer or copolymer thereof, or a salt thereof 78 The method of claim 74, wherein said admixing further comprises admixing an adhesive compound, said carrier, and said susceptor, wherein said carrier, said adhesive compound, and said susceptor are substantially uniformly dispersed in one another and form said mixture 79 A composition obtained according to the method of claim 74 80 A composition comprising an ionomeric polymer and a polar carrier 81 The composition according to claim 80, wherein said ionomeric polymer is a sulfonated polyester or a copolymer thereof, or a salt thereof 82 The composition according to claim 80, wherein said ionomeric polymer is an acrylic acid polymer or copolymer thereof, or a salt thereof 83 The composition according to claim 80, wherein said ionomeric polymer is gelatin 84 The composition according to claim 83, wherein said gelatin has a pH of about 8 to 12 85 The composition according to claim 83, wherein said gelatin has a pH of about 1 to 6 86 The composition according to claim 80, wherein said polar carrier is a polyol 87 The composition according to claim 86, wherein said polyol is selected from the group consisting of ethylene glycol, 1,2-propylene glycol, 1,3- propanediol, 2,4-dιmethyl-2-ethylhexane- 1,3, diol, 2,2-dιmethyl- 1,3-propanediol, 2-ethyl-2-butyl- 1,3-propanediol, 2-ethyl-2-ιsobutyl- 1 ,3-propanediol, 1 ,3- butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2, 2-4-tπmethyl- 1,6- hexanediol , thiodiethanol , 1 ,2-cyclohexanedιmethanol , 1 , 3 - cyclohexanedimethanol, 1,4-cyclohexanedιmethanol, 2,2,4,4-tetramethyl-l,3- cyclobutanediol, and p-xylylenediol 88 The composition according to claim 86, wherein said polyol is glycerin 89 The composition according to claim 86 wherein said polyol is polyvinyl alcohol 90 A method of curing a thermoset, comprising combining the thermoset with a polar carrier to give a mixture and exposing the mixture to RF energy 91 The method of claim 90, wherein said thermoset is an epoxy resin, an acrylic resin, a polyester resin or a urethane resin 92 The method of claim 90, wherein said polar carrier is a polyol 93 The composition according to claim 92, wherein said polyol is selected from the group consisting of ethylene glycol, 1,2-propylene glycol, 1,3- propanediol, 2,4-dιmethyl-2-ethylhexane- 1,3, diol, 2, 2-dιmethyl- 1 ,3-propanediol, 2-ethyl-2-butyl- 1,3-propanediol, 2-ethyl-2-ιsobutyl- 1 ,3 -propanediol, 1,3- butanediol, 1 ,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2, 2-4-tπmethyl- 1,6- hexanediol , thiodiethanol, 1 ,2-cyclohexanedιmethanol, 1 ,3 - cyclohexanedimethanol, 1 ,4-cyclohexanedιmethanol, 2,2,4,4-tetramethyl-l ,3- cyclobutanediol, and p-xylylenediol 94 The composition according to claim 92, wherein said polyol is glycerin 95 The composition according to claim 92, wherein said polyol is polyvinyl alcohol 96 An apparatus, compnsing a first portion having a first mating surface, a second portion, having a second mating surface, a composition disposed between said first mating surface and said second mating surface, wherein said composition comprises a susceptor and a polar carrier wherein said susceptor and/or said polar carrier are present in amounts effective to allow said composition to be heated by RF energy and wherein said composition adheres said first mating surface to said second mating surface such that application of a force to separate said first mating surface and said second mating surface results in breakage of the apparatus unless said composition is in a melted state 97 The apparatus of claim 96, wherein said composition is disposed on said first mating surface and said second mating surface such that said composition is not accessible when said first and second mating surfaces are joined 98 The apparatus of claim 96, wherein said portion comprises a protrusion from said first mating surface 99 The apparatus of claim 98, wherein said second portion comprises a recess formed in said second mating surface 100 The apparatus of claim 99, further comprising an electronic circuit path disposed on said protrusion 101 The apparatus of claim 96, wherein said first portion and said second portion are disassembled upon application of RF energy to said composition 102 A method for cutting a substrate, comprising applying a composition to a portion of the substrate, wherein the composition comprises a susceptor and polar carrier wherein said susceptor and/or said polar carrier are present in amounts effective to allow said composition to be heated by RF energy, and wherein said portion of the substrate defines a first section of said substrate and a second section of said substrate, melting said portion ofthe substrate, wherein said melting step includes the step of heating said composition, wherein the step of heating said composition includes the step of applying RF energy to said composition, after said portion of said substrate has begun to melt, applying a force to said substrate to separate said first section from said second section 103 A method for dynamically bonding a first adherand to a second adherand, comprising (1) creating an article of manufacture comprising the first adherand, the second adherand, and a composition, said composition being placed between the first adherand and the second adherand, wherein said composition can be activated in the presence of an RF field, (2) moving the article of manufacture along a predetermined path, (3) generating along a portion of said predetermined path an RF field having sufficient energy to activate said composition, wherein said composition is exposed to said RF field for no more than about 1 second, and wherein said composition is activated by its less than 1 second exposure to said RF field 104 The method of claim 103, wherein said article passes through said RF field at a rate of at least about one-thousand feet per minute 105 The method of claim 104, wherein the article passes through said RF field at a rate of about 1000 feet per minute 106 The method of claim 103 , wherein said composition comprises a susceptor and a polar carrier 107 A method for applying a susceptor composition to a substrate, comprising (1) formulating the susceptor composition as a liquid dispersion, (2) applying said liquid dispersion of said susceptor composition to the substrate, (3) drying said susceptor composition, wherein said drying step includes the step of applying RF energy across the composition, thereby generating heat within said liquid dispersion 108 The method of claim 107, further comprising rolling up the substrate after the susceptor composition has dried 109 A method of bonding or adhering a first substrate to a second substrate, comprising applying a first composition onto the first substrate, applying a second composition onto the first composition, contacting the second substrate with the second composition, and applying RF energy to the first and second compositions to heat the compositions, thereby causing the first and second substrates to become adhered or bonded, wherein one of said compositions comprises a susceptor and the other of said compositions is a polar carrier, and the susceptor and/or the carrier are present in amounts effective to allow the first and second compositions to be heated by RF energy 110 The method according to claim 41 , wherein one of the compositions comprises at least one susceptor and the other ofthe compositions comprises at least one polar carrier 1 11 The method according to claim 45, wherein one of the compositions comprises at least one susceptor and the other ofthe compositions comprises at least one polar carrier 1 12 The method according to claim 59, wherein one of the compositions comprises at least one susceptor and the other ofthe compositions comprises at least one polar carrier 1 13 The method according to claim 74, wherein one of the compositions comprises at least one susceptor and the other ofthe compositions comprises at least one polar carrier 1 14 The method according to claim 102, wherein one of the compositions comprises at least one susceptor and the other ofthe compositions comprises at least one polar carrier 1 15 The method according to claim 106, wherein one of the compositions comprises at least one susceptor and the other ofthe compositions comprises at least one polar carrier 1 16 The method according to claim 109, wherein one of the compositions comprises at least one susceptor and the other ofthe compositions comprises at least one polar carrier 1 17 The composition of claim 1 , wherein the susceptor comprises at least one susceptor and the carrier comprises at least one polar carrier 1 18 The composition of claim 2, wherein the susceptor comprises at least one susceptor and the carrier comprises at least one polar carrier 1 19 The composition of claim 3, wherein the susceptor comprises at least one susceptor and the carrier comprises at least one polar carrier 120 The composition of claim 79, wherein the susceptor comprises at least one susceptor and the carrier comprises at least one polar carrier 121 The kit according to claim 63, wherein the susceptor comprises at least one susceptor and the carrier comprises at least one polar carrier 122 The kit according to claim 64, wherein the susceptor comprises at least one susceptor and the carrier comprises at least one polar carrier 123 The apparatus of claim 96, wherein the susceptor comprises at least one susceptor and the carrier comprises at least one polar carrier 124 The method of claim 48, wherein said first and second multilayer stacks comprises two or more susbstrate material layers 125 A method for dynamically bonding a first substrate to a second substrate, comprising applying a composition onto the first substrate, after applying said composition onto the first substrate, forming a roll of said first substrate, storing said roll, unrolling said roll, and while unrolling said roll joining an unrolled portion ofthe first substrate with a portion of the second substrate such that said portion of the second substrate is in contact with a portion of said composition applied onto the first substrate, and applying RF energy to said portion of said composition, wherein said portion of said composition heats and melts as a result ofthe RF energy being applied thereto 126 A method for manufacturing a radio frequency (RF) active adhesive film, comprising formulating an RF active adhesive composition into an extrudable resin, providing said extrudable resin to a first extruder, providing a thermoplastic to a second extruder, providing a sealing material to a third extruder, layering the output ofthe first, second, and third extruder to form a three layered film, wherein said thermoplastic is disposed between said sealing material and said RF active adhesive composition, and stretching said three layered film 127 The method of claim 126, further comprising rolling up said three layered film after stretching said three layered film 128 The method of claim 126, further comprising heating said three layered film prior to stretching said three layered film 129 A method for manufacturing flexible packaging, comprising manufacturing a film comprising a first layer comprised of a sealing material, a second layer comprised of a thermoplastic composition, and a third layer comprised of a radio frequency (RF) active composition, wherein said second layer is disposed between said first layer and said third layer, and wherein said RF active composition can be heated by applying a radio signal thereto, applying ink to a thermoplastic film, contacting said first film with said thermoplastic film to form an assembly, wherein said thermoplastic film is in direct contact with said third layer, applying a radio signal to said assembly; and nipping said assembly 130 The method of claim 129, wherein said radio signal has a frequency of not more than about 20 MHz 131 The method of claim 129, wherein said radio signal has a frequency of not more than about 15 MHz 132 The method of claim 129, wherein said thermoplastic film is 70 gauge oriented polypropylene 133 The method of claim 129, wherein said radio frequency active composition comprises a susceptor and a polar carrier 134. The method of claim 129, wherein said radio signal is applied to said assembly for not more than about one second. 135. A seal for sealing a container, comprising: an outer layer of polyethylene; a layer of paper in contact with said outer layer; a second polyethylene layer in contact with said paper layer; a layer comprising a non-metallic susceptor composition in contact with said second polyethylene layer; a barrier layer in contact with said layer comprising said non-metallic composition; and an inner layer in contact with said barrier layer, wherein said non-metallic composition heats when a radio signal is applied thereto. 136. The seal of claim 135, wherein said non-metallic composition comprises a susceptor and a polar carrier. 137. A bookbinding method, comprising: applying a susceptor composition to a portion of one side of a substrate, wherein said susceptor composition can be heated by applying a radio signal thereto; feeding said substrate into a printing means for printing ink onto said substrate; after said printing means prints ink on said substrate, stacking said substrate with other substrates; applying a radio signal to said stack of substrates, thereby heating said susceptor composition; and nipping the stack. 138. The method of claim 137, wherein said susceptor composition comprises a susceptor and a polar carrier. 139 The method of claim 137, wherein said susceptor composition is transparent 140 The method of claim 137, wherein said substrate comprises paper 141 The method of claim 137, wherein said printing means is a photocopier 142 The method of claim 137, wherein said printing means is a printer 143 A method of assembling a periodical, comprising' coating a plurality of substrates with a composition, wherein the composition comprises a susceptor and polar carrier wherein said susceptor and/or said polar carrier are present in amounts effective to allow said composition to be heated by RF energy; print ink onto said plurality of substrates, stacking said plurality of substrates, applying an electromagnetic field to said plurality of substrates, and applying pressure to said plurality of substrates

Inventors: GORBOLD JONATHAN M, HAMILTON LEWIS, LUTTINGER MANFRED, RYAN WILLIAM J, SKEWES STEVE, VIJAYENDRAN BHIMA, GORBOLD, JONATHAN, M., HAMILTON, LEWIS, LUTTINGER, MANFRED, RYAN, WILLIAM, J., SKEWES, STEVE, VIJAYENDRAN, BHIMA
Applicants: AMERITHERM INC, AMERITHERM, INC.
Application year: 1999
Main classification: C09J11
IPC codes: B29C65, C09J5, C09J11, C09J201