Toner and developer compositions with compatibilizers

Abstract: A toner composition comprised of resin, colorant, wax, and a compatibilizer of the formula A (a) -B (b) -C (c) -D (d) - wherein A is ethylene, B is propylene, C is butene, and D is pentene, and wherein the mol fractions are represented by a, b, c, and d, and wherein a is from about 0.05 to about 0.95, b is from about 0.05 to about 0.95, c is from about 0.05 to about 0.95, and d is from about 0.05 to about 0.95, and subject to the provision that the sum of a, b, c, and d are equal to about 1.

Description: This invention is generally directed to toner and developer compositions, and more specifically, the present invention is directed to toner compositions, including magnetic, single component, two component and colored toner compositions wherein a low toughness component (compression toughness of from 0.35-10 5 kg-m/m 3 to 2.81·10 5 kg-m/m 3 (50 Ib-in/in 3 to 400 Ib-in/in 3 )), such as low molecular weight polymers (2,000<M n <85,000, preferably 3,000<M n <25,000) are selected, for wax component dispersion enhancement, and wherein excellent jetting characteristics are enabled. Certain low toughness copolymers, enable more rapid toner jetting rates, provide toners with superior wax dispersion, and furthermore improve the minimum fusing temperatures of wax containing toners. In embodiments of the present invention, the toner compositions can contain at least two polymer resins, and in embodiments from 2 to 10 polymers comprised, for example, of a first resin, a second crosslinked resin, a wax component, and a low toughness polymer compatibilizer component. In embodiments of the present invention, the toner compositions are comprised of resin particles, especially crosslinked extruded polyester resin particles, pigment particles, a wax component, such as polypropylene wax, and the low toughness polymer compatibilizer. There is also provided in accordance with the present invention positively or negatively charged toner compositions comprised of resin particles, pigment particles, a wax component, such as polypropylene wax, and certain low toughness copolymer compatibilizers, and charge enhancing additives. In addition, the present invention is directed to developer compositions comprised of the aforementioned toners, and carrier particles. Furthermore, in another embodiment of the present invention there are provided single component toner compositions comprised of resin particles, magnetic components, such as magnetites, a wax component, such as polypropylene wax, and the compatibilizer. The toner and developer compositions of the present invention are useful in a number of known electrostatographic imaging and printing systems, especially those systems wherein a wax is present in the toner. The developer compositions of the present invention, in embodiments, possess a wide fusing latitude, for example, about 100°C, which is the temperature range between the minimum fixing temperature of, for example, from 100°C to 170°C of importance for fixing toner particles on paper, and the hot offset temperature, for example, from 180°C to 250°C, which is the temperature where molten toner adheres to the fuser roll. The developer compositions of the present invention also provide toner images with low surface energy and a low frictional coefficient, which properties enable the effective release of paper from the fuser roll and provide for a reduction in image smudging. Further, the developer compositions of the present invention possess stable electrical properties for extended time periods, and with these compositions, for example, there is no substantial change in the triboelectrical charging values. Also, with the toner compositions of the present invention, the wax, Which enhances toner release from the fuser roll and increases fusing latitude, is retained therein and the loss of wax from the toner is eliminated or minimized; and moreover, the toner compositions of the present invention with stabilized wax domains are more easily processed by extrusion, are easily and superiorly jetted which allows more rapid toner production and lower toner manufacturing costs. The control of wax concentration also enables the economy of direct recycling of toner fines obtained after particle size classification which would ordinarily be discarded as waste material. The dispersion stabilization of wax by compabbilizers also decreases the minimum fusing and release temperature, thereby improving toner fusing latitude. There are various problems observed with the inclusion of polyolefin or other waxes in toners. For example, when a polypropylene wax is included in toner to enhance the release of toner from a hot fuser roll, or to improve the lubrication of fixed toner image it has been observed that the wax does not disperse well in the toner resin. As a result, free wax particles are released during the pulverizing/jetting, or micronization) step in, for example, a fluid energy mill and the pulverization rate is lower. The poor dispersion of wax in the toner resin and, therefore, the loss of wax will then impair the release function it is designed for. Scratch marks, for example, on xerographic developed toner solid areas caused by stripper fingers were observed as a result of the poor release. Furthermore, the free wax remaining in the developer will build up on the detone roll present in the xerographic apparatus causing a hardware failure. The aforementioned problems, and others can be eliminated, or minimized with the toner compositions and processes of the present invention in embodiments thereof. The present invention provides a toner composition comprised of resin, colorant, wax, and a compatibilizer containing a segment of the formula A (a) -B (b) -C (c) -D (d) - wherein A is ethylene, B is propylene, C is butene, and D is pentene, and wherein the mol fractions are represented by a, b, c, and d, and wherein a is from 0.05 to 0.95, b is from 0.05 to 0:95, c is from 0.05 to 0.95, and d is from 0.05 to 0.95, and subject to the provision that the sum of a, b, c, and d are equal to about 1, and wherein the compatibilizer possesses a compression toughness as defined in claim 1. The present inventon further provides a developer composition comprised of the above toner composition, and carrier particles. Moreover, the present invention provides a method for obtaining images which comprises generating an electrostatic latent image on a photoconductive imaging member, subsequently affecting development of this image with the above toner composition, thereafter transferring the image to a permanent substrate, and optionally permanently affixing the image thereto. The present invention is also directed to a process for minimizing the amount of wax that escapes from a toner which comprises melt mixing the components of the above toner composition, namely the toner resin, the colorant, the wax component, and the compatibilizer. Preferred embodiments of the present invention are set forth in the subclaims. The toners of the present invention are effectively jettable it is believed because the specific low toughness copolymers added as wax compatibilizers disperse wax into domains less than for, example, 2 µm (microns) without toughening the toner composite of wax, wax dispersant, colorant, charge control agent and colorant. Moreover, the specific compatibilizers used in the present invention are friable powders which enable better mixing of the toner components by extrusion processes. A number of specific advantages are associated with the invention of the present application in embodiments thereof, including improving the dispersion of toner resin particles, especially a mixture of resins and wax; improving the dispersion of wax in the toner, thus eliminating the undesirable release of wax from the toner in the form of free wax particles during the pulverizing operation of the toner manufacturing process and the subsequent contamination of xerographic machine subsystems by free wax particle; avoiding the pulverizing rate reduction resulting from the poor wax dispersion; maintaining the intended concentration of wax in the toner to provide enhanced release of toner images from the fuser roll and the avoidance of the undesirable scratch marks caused by the stripper fingers required for paper management; a wide process latitude can be provided during the mechanical blending operation of the toner manufacturing process; and the effective mechanical blending of toner is able to be accomplished in a number of devices, including an extruder. Although the toners of U.S. Patent 5,229,242 serve its intended purposes, improved wax compatibilizer compositions have been developed after extensive research and many failures. Toners with the compatibilizer used in the present invention enable improved extruder mixing and processing, superior toner jetting rate, improved wax dispersions, and improved fusing properties at reduced cost. The wax compatibilizers of U.S. Patent 5,229,242 are considered, it is believed, thermoplastic elastomers, which indicates a material that at room temperature (25°C) can be stretched repeatedly at least twice its original length and upon immediate release of the stress will return with force to its original approximate length. Although the elastomeric materials in the U.S. Patent 5,229,242 Examples do compatibilize wax, these high-molecular weight materials may also impart toughness and poor processing characteristics, such as poor toner jettability to the toner composite. Moreover, these commercially available elastomeric materials are often mixtures of diblock and triblock copolymers which can possess counter-productive properties in toner applications. According to one aspect of the present invention there are provided toner and developer compositions with excellent jetting rates and which toners enable improved dispersion of resin and wax components achievable in a number of devices, including an extruder. Another aspect of the present invention relates to the provision of toner and developer compositions with a low toughness compatibitizer according to claim 1, and wherein for the resulting toners there is avoided, or there is minimized, the undesirable generation of particles comprised entirely of a secondary polymer component during toner preparation. According to the present invention the toner mechanical blending operation can be accomplished at a melt temperature as high as 50°C above the melting point of the wax component, thus enabling the use of a large number of apparatuses in addition to a low melt temperature mixing process using equipment, such as a Banbury mixer, and wherein the toners are easily jettable. According to the present invention the secondary polymeric phases in the toner will remain stable and substantial phase separation, especially over extended time periods of, for example, up to three months in embodiments, will not take place. According to the present invention there are provided toner and developer compositions with certain waxes therein or thereon that enable images of excellent quality inclusive of acceptable resolutions, and that possess other advantages as illustrated herein such as low surface energy and excellent jetting rates. The present invention further provides processes for the preparation of toner compositions wherein the undesirable escape of the wax contained therein is avoided or minimized. These and other advantages are obtained according to the present invention. More specifically, the present invention is directed to toner compositions comprised of resin particles, colorants, such as pigment particles inclusive of magnetites, waxes, and as compatibilizer a low toughness polymer as illustrated herein. In embodiments of the present invention, there are provided toner compositions comprised of first resin particles, second crosslinked resin particles, colorant especially pigment particles, low molecular weight waxes, such as polyethylene, and polypropylene, such as those available from Sanyo Chemicals of Japan as VISCOL 550P™ and VISCOL 660P™, Mitsui "Hi-wax" NP055 and NP105, or wax blends such as MicroPowders, Micropro-440 and 440w, and the like, and as a compatibilizer, certain low toughness copolymers according to claim 1. Furthermore, there are provided in accordance with the present invention positively charged toner compositions comprised of resin particles, pigment particles, low molecular weight waxes, a low toughness copolymer compatibilizer according to claim 1, and a charge enhancing additive. Another embodiment of the present invention is directed to developer compositions comprised of the aforementioned toners; and carrier particles. In addition, in accordance with embodiments of the present invention, there are provided developer compositions comprised of toner compositions containing first resin particles like a styrene butadiene resin, optional second crosslinked resins of, for example, a styrene methacrylate crosslinked with known components such as divinylbenzene, pigment particles, such as MAPICO BLACK®, magnetites, carbon blacks or mixtures thereof, low molecular weight waxes, such as polyethylene, and polypropylene, such as those available from Sanyo Chemicals of Japan as VISCOL 550P™ and VISCOL 660P™, or Mitsui "Hi-wax" NP055 and NP105, or wax blends, for example the toner can have a wax content up to 15 percent by weight, and more specifically, from 0.05 to 6 weight percent, or from 0.05 to 6 weight percent, such as MicroPowders, Micropro-440 and 440w, a compatibilizer comprised of a low toughness copolymer as defined in claim 1, and an optional charge enhancing additive, particularly, for example, distearyl dimethyl ammonium methyl sulfate, reference U.S. Patent 4,560,635, and carrier particles. As carrier components for the aforementioned compositions, there can be selected a number of known materials like steel, iron, or ferrite, particularly with a polymeric coating thereover including copolymers of vinyl chloride and trifluorochloroethylene with conductive substances dispersed in the polymeric coating inclusive of, for example, carbon black. Embodiments of the present invention include a toner composition according to claim 1 comprised of resin, colorant, wax, and a compatibilizer containing a segment of the formula A (a) -B (b) -C (c) -D (d) - wherein A is ethylene, B is propylene, C is butene, and D is pentene, and wherein the mol fractions are represented by a, b, c, and d, and wherein a is from 0.05 to 0.95, b is from 0.05 to 0.95, c is from 0.05 to 0.95, and d is from 0.05 to 0.95, and subject to the provision that the sum of a, b, c, and d are equal to about 1 and wherein the compabilizer has a compression toughness as defined in claim 1. Preferably, the colorant in the toner is a pigment. Preferably, each of a, b, c, and d are from 0.1 to 0.8. It is also preferred that the weight average molecular weight, M w , of the compatibilizer is from 1,000 to 50,000, more preferably from 1,500 to 20,000. In one embodiment the compatibilizer further contains E, F, and G, and which compatibilizer is of the formula A (a) -B (b) -C (c) -D (d) -E (e) -F (f) -G (g) and wherein E is a reactive functional group, F is a reactive functional group and G is styrene, and each e, f, and g are mol fractions of from 0.05 to 0.95, and wherein the sum of a, b, c, d, e, f, and g is about 1 mol fraction. In this embodiment E is preferably a reactive functional group of an acid, an anhydride, a hydroxyl, a glycidyl, or an amine; and F, which is reactive with E at elevated temperatures, is an anhydride, a hydroxyl, an acid, a glycidyl, or an amine group. It is also preferred that the reaction of E and F is an acid-glycidyl reaction, an amine-glycidyl reaction, an anhydride-glycidyl reaction, an anhydride-amine reaction, a hydroxyl-acid reaction, or a hydroxyl-glycidyl reaction. Preferably, the M w of said E, F, and G segments is from 1,000 to 50,000, or from 1,500 to 20,000. Moreover, said E, and F segments are preferably present in the polymer in an amount of from 0.05 to 10 per polymer chain. In one embodiment the compatibilizer is an elastomeric thermoplastic styrene copolymer, wherein this compatibilizer is as defined in claim 1. In one embodiment the toner contains further second crosslinked resin particles. In this embodiment it is preferred that the first resin particles are present in an amount of from 40 to 90 weight percent, and the second resin particles are present in an amount of from 60 to 10 weight percent, or other suitable amounts. Preferably, the first resin partides are comprised of styrene butadiene, styrene acrylate, or styrene methacrytate, and wherein the second crosslinked resin particles are comprised of a crosslinked polymer of styrene butadiene, styrene acrylate, or styrene methacrylate, wherein the first resin is present in an amount of from 50 weight percent to 85 weight percent, and the second resin is present in an amount of from 10 weight percent to 40 weight percent. The compatibilizer possesses a compression toughness of from, for example, 1.41·10 5 kg-m/m 3 to 2.81·10 5 kg-m/m3 (200 to 400 Ib-in/in 3 ), but in any case less than 2.81·10 5 kg-m/m 3 (400 Ib-in/in 3 ). In one embodiment it is preferred that the wax and the compatibilizer together form domains of an average particle diameter of from 0.1 to 2 µm (microns). Preferably, the compatibilizer is present in an amount of from 0.5 to 10 weight percent, or, when the colorant is a pigment, from 1 to 3 percent. Preferably, the resin particles are selected from the group consisting of polyesters, styrene butadiene copolymers, styrene diene copolymers, styrene polyolefin copolymers, styrene acrylate copolymers, and styrene methacrylate copolymers. In this embodiment the polyester resin selected can result from the condensation reaction of dimethylterephthalate, 1,2-propanediol, 1,3-butanediol, and pentaerythritol; or wherein the polyester results from the condensation reaction of proxylated-bisphenol A, dimethylterephthalate, 1,2-propanediol, diethylene glycol, and pentaerythritol. Preferably, the colorant is the pigment carbon black, magnetite, magenta, cyan, yellow, or mixtures thereof. It is also preferred that the wax has a weight average molecular weight of from 1,000 to 10,000, that the wax is a polyolefin, or mixture of polyolefins, and that said wax is present in an amount of from 1 to 10 weight percent, and that the toner further contains a charge enhancing additive selected from the group consisting of distearyl dimethyl ammonium methyl sulfate, a cetyl pyridinium halide, and stearyl phenethyl dimethyl ammonium tosylate, and wherein the polyolefin is polyethylene or polypropylene The present invention provides further a developer composition comprised the toners illustrated herein and carrier particles. The present invention provides further a method for obtaining images which comprises generating an electrostatic latent image on a photoconductive imaging member, subsequently affecting development of this image with the toner compositions illustrated herein, thereafter transferring the image to a permanent substrate, and optionally, but preferably permanently affixing the image thereto. The present invention provides further a process for minimizing the amount of wax that escapes from a toner which comprises melt mixing toner resin, colorant, a wax component, and the low toughness compatibilizer illustrated herein. Illustrative examples of suitable toner resins selected for the toner and developer compositions of the present invention, and present in various effective amounts, such as, for example, from 65 percent by weight to 95 percent by weight, include styrene acrylates, styrene methacrylates, styrene butadienes, styrene isoprenes, polyesters, polyamides, epoxy resins, polyurethanes, polyolefins, vinyl resins, polymeric esterification products of a dicarboxylic acid and a diol comprising a diphenol; crosslinked resins; and mixtures thereof. . As one toner resin, there can be selected the esterification products of a dicarboxylic acid and a diol comprising a diphenol, which components are illustrated in U.S. Patent 3,590,000. Other toner resins include styrene/methacrylate copolymers, styrene/acrylate copolymers, and styrene/butadiene copolymers, especially those as illustrated in the aforementioned patent; and styrene butadiene resins with high styrene content, that is exceeding from 80 to 85 percent by weight of styrene, which resins are available as PLIOLITES® and PLIOTONES® obtained from Goodyear Chemical Company; polyester resins obtained from the reaction of bisphenol A and propylene oxide, followed by the reaction of the resulting product with fumaric acid; and branched polyester resins resulting from the reaction of dimethylterephthalate, 1,3-butanediol, 1,2-propanediol and pentaerythritol. In embodiments, the toner is comprised of a mixture of resins comprised, for example, of a first resin as illustrated herein like styrene acrylate, styrene methacrylate, or styrene butadiene with a high styrene content, and a second polymer comprised of a crosslinked copolymer of styrene and butyl methacrylate. The aforementioned mixture of first and second resins can contain various effective amounts of each resin, for example from 50 to 90, and preferably about 70 weight percent of the first resin like styrene butadiene, and from 50 to 10, and preferably about 30 weight percent of the second resin like the resin crosslinked with, for example, divinylbenzene. Preferred toner resin includes the extruded polyesters of U.S. Patents 5,376,494 and 5,227,460. Numerous well known suitable colorants, especially pigments, can be selected as the colorant for the toner particles including, for example, carbon black, like REGAL 330®, BLACK PEARLS®, VULCAN®, and the like, nigrosine dye, aniline blue, phthalocyanine derivatives, magnetites and mixtures thereof. The pigment, which is preferably carbon black, should be present in a sufficient amount to render the toner composition colored thereby permitting the formation of a clearly visible image. Generally, the colorant particles are present in amounts of from 1 percent by weight to 20 percent by weight, and preferably from 4 to 10 weight percent, based on the total weight of the toner composition, however, lesser or greater amounts of colorant particles may be selected in embodiments. When the pigment particles are comprised of known magnetites, including those commercially available as MAPICO BLACK®, they are usually present in the toner composition in an amount of from 10 percent by weight to 70 percent by weight, and preferably in an amount of from 10 percent by weight to 30 percent by weight. Alternatively, there can be selected as pigment particles mixtures of carbon black or equivalent pigments and magnetites, which mixtures, for example, contain from 6 percent to 70 percent by weight of magnetite, and from 2 percent to 15 percent by weight of carbon black. In another embodiment of the present invention there are provided colored toner compositions containing dyes, or pigments, known magenta, cyan, and/or yellow particles, as well as mixtures thereof. Also, there may be selected red, green, blue, brown, and the like pigments. These pigments are generally present in the toner composition in an amount of from 2 weight percent to 15 weight percent, and preferably from 2 to 10 weight percent, based on the weight of the toner resin particles. Colorant includes pigments, dyes, mixtures thereof, mixtures of pigments mixtures of dyes, and the like to primarily impart color to the toner. Examples of low molecular weight, for example from 1,000 to 20,000, and preferably from 1,000 to 7,000, waxes include those as illustrated in British Patent Publication 1,442,835, such as polyethylene, polypropylene, and the like, especially VISCOL 550P™ and VISCOL 660P™. The aforementioned waxes, which can be obtained in many instances from Sanyo Chemicals of Japan, are present in the toner in various effective amounts, such as for example from 0.5 to 10, and preferably from 3 to 7 weight percent. Examples of functions of the wax are to enhance the release of paper after fusing, and providing the fused toner image with lubrication. The release or separation of wax from the toner can reduce these functions. Also, toners with poor wax dispersion have a lower pulverizing rate and the free wax which can remain with the toner will build up on the internal parts of the xerographic cleaning device causing a machine failure. The low toughness compatibilizers are represented, for example, by the formula: A (a) -B (b) -C (c) -D (d) -E (e) -F (f) -G (g) derived in any order, for example random, from monomers A to D where A is ethylene; B is propylene; C is butene; D is pentene; E is a reactive functional group, such as acidic, anhydride, hydroxyl, glycidyl, amine groups; and F is a reactive functional group that is reactive to E at elevated temperatures, such as anhydride, hydroxyl, acidic, glycidyl, amine groups, and G is styrene. The aforementioned monomers may be present in the polymer in the following mole fraction: (a) 0.05 to 0.95; (b) 0.05 to 0.95; (c) 0.05 to 0.95; (d) 0.05 to 0.95; (e) 0.05 to 0.95; (f) 0.05 to 0.95; and (g) 0.05 to 0.95, and wherein the total of all components is a mole fraction of 1.0. Preferably (a) to (g) are present in the following mole fraction: (a) 0.1 to 0.9; (b) 0.1 to 0.9; (c) 0.1 to 0.8; (d) 0.1 to 0.7; (e) 0.1 to 0.1; (f) 0.1 to 0.1; and (g) 0.1 to 0.8. The molecular weights of G segments are typically between 1,000 and 50,000 with preferred M w between 1,500 and 20,000. The molecular weight M w of A-B-C-D segments are from 1,000 to 40,000, with preferred M w values of from 1,500 to 20,000. The number of the E to F segments may be present in the polymer from 0 to 10 per polymer chain, and preferably from 0 to 5 per polymer chain. The M w of the entire polymer with A to G is from 2,000 to 90,000 and preferably from 3,000 to 50,000. Illustrative examples of optional charge enhancing additives present in various effective amounts, such as for example from 0.1 to 20, and preferably from 1 to 5 percent by weight, include alkyl pyridinium halides, such as cetyl pyridinium chlorides, reference U.S. Patent 4,298,672, cetyl pyridinium tetrafluoroborates, quaternary ammonium sulfate, and sulfonate charge control agents as illustrated in U.S. Patent 4,338,390; stearyl phenethyl dimethyl ammonium tosylates, reference U.S. Patent 4,338,390; distearyl dimethyl ammonium methyl sulfate, reference U.S. Patent 4,560,635; stearyl dimethyl hydrogen ammonium tosylate; negative charge control agents, such as di-t-butylaluminum salicylate, Alohas or BONTRON E88® (available from Orient), E-88® (available from Hodogaya), tetraphenyl phosphonium tetrafluoroborate, and other known similar charge enhancing additives; and the like. With further respect to the toner and developer compositions of the present invention, a component that may be present therein is the linear polymeric alcohol comprised of a fully saturated hydrocarbon backbone with at least 80 percent of the polymeric chains terminated at one chain end with a hydroxyl group, which alcohol is represented by the following formula CH 3 (CH 2 ) n CH 2 OH wherein n is a number of from 30 to 300, and preferably of from 30 to 100, which alcohols are available from Petrolite Corporation. Illustrative examples of carrier particles that can be selected for mixing with the toner compositions of the present invention include those particles that are capable of triboelectrically obtaining a charge of opposite polarity to that of the toner particles. Illustrative examples of known carrier particles that may be selected include granular zircon, granular silicon, glass, steel, nickel, iron, ferrites, like copper zinc ferrites, available from Steward Chemicals, and the like. The carrier particles may include thereon known coatings like fluoropolymers, such as KYNAR®, polymethylacrylate, and the like. Examples of specific coatings that may be selected include a vinyl chloride/trifluorochloroethylene copolymer, which coating contains therein conductive particles, such as carbon black. Other coatings include fluoropolymers, such as polyvinylidenefluoride resins, poly(chlorotrifluoroethylene), fluorinated ethylene and propylene copolymers, terpolymers of styrene, methylmethacrylate, and a silane, such as triethoxy silane, reference U.S. Patents 3,467,634 and 3,526,533; polytetrafluoroethylene, fluorine containing polyacrylates, and polymethacrylates; copolymers of vinyl chloride, trichlorofluoroethylene, and other known coatings. There can also be selected as carriers components comprised of a core with a mixture, especially two, polymer coatings thereover, reference United States Patents 4,937,166 and 4,935,326. The advantage of including a compatibilizer may not be limited to the mechanical blending process alone; thus, for example, improved dispersion and adhesion can be realized in other known preparation methods by using the toner compositions of the present invention. Also, high concentrations of a secondary polymer, such as wax, can be effectively dispersed in a toner by including an effective amount of compatibilizer. Thus, there is a significant cost advantage realized from the processing time required for grinding and jetting operations in toner manufacture. The improvement in toner jetting rate with the compatibilizer copolymers of the instant invention can, for example, be between 2 to 3 times more rapid than with the toners of U.S. Patent 5,229,242 or U.S. Patent 5,486,445. This jetting rate advantage together with fewer toner fines results in more than a two-fold reduction in the final cost of the toner. The compatibilizer compression toughness is determined at room temperature, about 25°C, using an Instron instrument Model 8511 (ASTM D695). The crosshead speed is 1.0 inch/minute. The test specimens are to be prepared under vacuum by compression molding of 100 percent pure compatibilizer at 100°C, 5 psi for 5 minutes, and gradually cooling down to room temperature at approximately 4°C/minute. The size of the test specimens is 0.25 inch in diameter and approximately 1 inch in length. Both edges are to be polished with sand paper #2000 to #3000 to ensure accurate contact with the load in the compression test. The stress-strain curves are recorded in the test and the compression toughness is calculated as the integration of the area of the stress-strain curve divided by the volume of the test specimen. At least three specimens are to be tested for the same material to reduce the test variation. The toughness of HI-WAX 1140H was calculated as 85 Ib-in/in 3 .

Claims: A toner composition comprised of resin, colorant, wax, and a compatibilizer containing a segment of the formula A (a) -B (b) -C (c) -D (d) - wherein A is ethylene, B is propylene, C is butene, and D is pentene, and wherein the mol fractions are represented by a, b, c, and d, and wherein a is from 0.05 to 0.95, b is from 0.05 to 0.95, c is from 0.05 to 0.95, and d is from 0.05 to 0.95, and subject to the provision that the sum of a, b, c, and d are equal to about 1and wherein the compatibilizer possesses a compression toughness of less than 2.81·10 5 kg-m/m 3 (400 lb-in/in 3 ). The toner composition in accordance with claim 1 wherein the weight average molecular weight, M w , of said compatibilizer is from 1,500 to 20,000. The toner composition in accordance with claim 1 or 2 wherein the compatibilizer further contains E, F, and G, and which compatibilizer is of the formula A (a) -B (b) -C (c) -D (d) -E (e) -F (f) -G (g) and wherein E is a reactive functional group, F is a reactive functional group and G is styrene, and each e, f, and g are mol fractions of from 0.05 to 0.95, and wherein the sum of a, b, c, d, e, f, and g is about 1 mol fraction. The toner composition in accordance with claim 3 wherein E is a reactive functional group of an acid, an anhydride, a hydroxyl, a gycidyl, or an amine; and F, which is reactive with E at elevated temperatures, is an anhydride, a hydroxyl, an acid, a glycidyl , or an amine group. The toner composition in accordance with claim 3 wherein said E, and F segments are present in the polymer in an amount of from 0.05 to 10 per polymer chain. The toner composition in accordance with any of claims 1 to 5 wherein the compatibilizer is an elastomeric thermoplastic styrene copolymer. A developer composition comprised of the toner composition of any of claims 1 to 6, and carrier particles. A method for obtaining images which comprises generating an electrostatic latent image on a photoconductive imaging member, subsequently affecting development of this image with the toner composition of any of claims 1 to 6, thereafter transferring the image to a permanent substrate, and optionally permanently affixing the image thereto. A process for minimizing the amount of wax that escapes from a toner which comprises melt mixing the components of the toner composition of any of claims 1 to 6, namely the toner resin, the colorant, the wax component, and the compatibilizer.

Inventors: LIN PINYEN, VANDUSEN JOHN G, LIN, PINYEN, VANDUSEN, JOHN G.
Applicants: XEROX CORP, XEROX CORPORATION
Application year: 1998
Main classification: G03G9
IPC codes: G03G9