Conductive adhesive tape and manufacturing method thereof

Provided is a conductive adhesive tape comprising: a substrate that is formed in a nano-web form having a number of pores by spinning a polymer material by a spinning method; and a conductive adhesive layer that is formed in a non-porous form by directly spinning a conductive adhesive material by a spinning method on one or both surfaces of the substrate, or that is laminated on one or both surfaces of the substrate. Accordingly, thickness of the adhesive tape can be made thin, adhesive strength of the adhesive tape can be enhanced, and the adhesive tape can be precisely attached on even a curved surface. Further, when removing the adhesive tape from components, the adhesive layer can be prevented from remaining on the surface of the components.

TECHNICAL FIELD

The present invention relates to an adhesive tape on both surfaces or one surface of which an adhesive layer is provided, and more particularly, to a conductive adhesive tape having electrical conductivity performance and an electromagnetic wave shielding function.

BACKGROUND ART

In general, conductive adhesive tapes are mainly used for the purpose of enabling two components to be electrically adhered to each other, and used in various forms.

One type of conventional conductive adhesive tapes is a conductive adhesive tape that is formed by coating an adhesive mixed with a conductive powder on an electrically conductive polyester fiber or nylon fiber on which Ni, Cu, Ag or the like with excellent electrical conductivity is electrolessly plated.

However, such a conductive tape is expensive because of using a conductive fiber, and burr can be caused from a cutting surface during cutting. The electrical conductivity and heat conductivity of the conductive adhesive tape is less than the adhesive tape with metal foils.

Another type of the conventional conductive adhesive tapes is an adhesive tape that is formed by laminating a metal foil such as aluminum on one surface of a polyester (PET) film, to increase the tear strength of the metal foil such as aluminum, and prevent wrinkling of the metal foil such as aluminum, and coating a conductive acrylic adhesive mixed with a conductive powder such as Ni on the other surface of the polyester (PET) film. However, such a conductive adhesive tape has a problem that electrical and thermal properties are deteriorated because of poor vertical electrical conductivity and thermal conductivity.

Further, another type of the conventional conductive adhesive tapes has problems that flexibility of the conductive adhesive tape is lowered by filling punched holes in a polymeric film layer with a conductive solution, and further a conductive material and a polymer film are separated or spaced from each other in the punched holes during flowing of the conductive solution.

As disclosed in Korean Utility Model Registration No. 20-0398477, a conventional conductive adhesive tape includes: a sheet layer that is a substrate; a first conductive metal paste coating layer that is coated on the upper side of the sheet; a second conductive metal paste coating layer that is coated on the lower side of the sheet; a first conductive adhesive layer laminated on the first conductive metal paste coating layer; a second conductive adhesive layer laminated on the second conductive metal paste coating layer; and a release paper layer that is laminated on the other surface of the second conductive adhesive layer laminated on the second conductive metal paste coating layer.

Here, the sheet that is a support material employs any one of a PET film, mesh fabric, nonwoven fabric, and rubber sheet. In the case of the PET film, a plurality of holes are formed and the plurality of holes are filled with a metal paste, to thus electrify the first conductive adhesive layer and the second conductive adhesive layer.

However, since the conventional conductive adhesive tape should employ a PET film, mesh fabric, nonwoven fabric, or rubber sheet as the sheet, and should form a plurality of holes for electrification, there are problems that the thickness of the conductive adhesive tape is thicker, the manufacturing process thereof is complicated, and the manufacturing cost thereof increases.

DISCLOSURE

Technical Problem

To solve the above problems or defects, it is an object of the present invention to provide a conductive adhesive tape and a method of manufacturing the same, in which a substrate is fabricated in a nano-web form made of a plurality of pores, by a spinning method, and an adhesive material is absorbed into the plurality of pores, to thereby allow the conductive adhesive tape to be made thin and to have an excellent conductivity.

It is another object of the present invention to provide a conductive adhesive tape and a method of manufacturing the same, in which a substrate is fabricated in a nano-web form made of a plurality of pores, by a spinning method, to thereby enhance a flexibility of the conductive adhesive tape so as to be precisely attached to even a curved surface.

It is another object of the present invention to provide a conductive adhesive tape and a method of manufacturing the same, in which an adhesive material is absorbed into a number of pores formed in a substrate, to thereby increase the amount of an adhesive and enhance an adhesive strength.

It is another object of the invention to provide a conductive adhesive tape and a method of manufacturing the same, in which a conductive metal is deposited on one surface of a substrate to thereby provide an electrical conductivity and perform an electromagnetic wave shielding function.

The technical problems to be solved in the present invention are not limited to the above-mentioned technical problems, and the other technical problems that are not mentioned in the present invention may be apparently understood by one of ordinary skill in the art to which the present invention belongs.

Technical Solution

To accomplish the above and other objects of the present invention, according to an aspect of the present invention, there is provided a conductive adhesive tape comprising: a substrate that is formed in a nano-web form having a number of pores by spinning a polymer material by a spinning method; and a conductive adhesive layer that is formed in a non-porous form by directly spinning a conductive adhesive material by a spinning method on one or both surfaces of the substrate, or that is laminated on one or both surfaces of the substrate.

According to another aspect of the present invention, there is provided a conductive adhesive tape comprising: a substrate that is formed in a nano-web form having a number of pores by spinning a polymer material by a spinning method; a non-porous film layer that is formed on one surface of the substrate and that has an electrical conductivity; a first conductive adhesive layer that is formed in a non-porous form by spinning a conductive adhesive material by the spinning method on the non-porous film layer; and a second conductive adhesive layer that is laminated on the other surface of the substrate.

According to another aspect of the present invention, there is provided a conductive adhesive tape comprising: a first substrate that is formed in a nano-web form having a number of pores by spinning a polymer material by a spinning method; a non-porous film layer that is formed on one surface of the first substrate, and has an electrical conductivity; a first conductive adhesive layer that is laminated on the other surface of the substrate in a non-porous form by spinning a conductive adhesive material by the spinning method; and a conductive double-side tape that is laminated on the non-porous film layer, wherein the conductive double-side tape comprises: a second substrate that is formed in a nano-web form having a number of pores by spinning the polymer material by the spinning method; a second conductive adhesive layer that is formed on one surface of the second substrate; and a third conductive adhesive layer that is formed on the other surface of the second substrate.

According to another aspect of the present invention, there is provided a conductive adhesive tape comprising: a substrate that is formed in a nano-web form having a number of pores by spinning a polymer material by a spinning method; a first conductive adhesive layer that is stacked on one surface of the substrate; and an electromagnetic wave shielding layer that is stacked on the other surface of the substrate; and a second conductive adhesive layer that is stacked on the surface of the electromagnetic wave shielding layer, wherein the first conductive adhesive layer and the second conductive adhesive layer are formed by using any one of a casting method, a coating method, and a gravure coating method.

According to another aspect of the present invention, there is provided a method of manufacturing a conductive adhesive tape comprising the steps of: forming a first conductive adhesive layer by spinning a conductive adhesive material; forming a substrate in a nano-web form by spinning a polymer material on the first conductive adhesive layer; and forming a second conductive adhesive layer by spinning the conductive adhesive material on the surface of the substrate.

According to another aspect of the present invention, there is provided a method of manufacturing a conductive adhesive tape comprising the steps of: forming a substrate in a nano-web form by spinning a polymer material; forming an electromagnetic wave shielding layer to shield electromagnetic waves by depositing an electrically conductive metallic material on one surface of the substrate; forming a first conductive adhesive layer by spinning a conductive adhesive material on the electromagnetic wave shielding layer; and laminating a second conductive adhesive layer that is formed by spinning a conductive adhesive material on the other surface of the substrate.

According to another aspect of the present invention, there is provided a method of manufacturing a conductive adhesive tape comprising the steps of: forming a substrate in a nano-web form by spinning a polymer material; forming a non-porous film layer by spinning a polymeric material containing PU or TPU and an electrically conductive material on one surface of the substrate; forming a first conductive adhesive layer by spinning a conductive adhesive material on the non-porous film layer; and laminating a second conductive adhesive layer that is formed by spinning a conductive adhesive material on the other surface of the substrate.

According to another aspect of the present invention, there is provided a method of manufacturing a conductive adhesive tape comprising the steps of: forming a first substrate in a nano-web form by spinning a polymer material; forming a non-porous film layer by spinning a polymeric material containing PU or TPU and an electrically conductive material on one surface of the first substrate; forming a first conductive adhesive layer by spinning a conductive adhesive material; laminating the first conductive adhesive layer on one surface of the first substrate; and laminating a conductive double-side tape on the non-porous film layer.

Advantageous Effects

As described above, a conductive adhesive tape and a method of manufacturing the same, according to the present invention, is configured by forming a substrate in a nano-web form made of a plurality of pores, by a spinning method, and stacking an adhesive material on one or both surfaces of the substrate by the spinning method, so that the adhesive material is absorbed into the plurality of pores, to thereby allow the conductive adhesive tape to be made thin and to have an excellent conductivity.

In addition, a conductive adhesive tape and a method of manufacturing the same, according to the present invention, is configured by forming a substrate in a nano-web form made of a plurality of pores, by a spinning method, to thereby enhance a flexibility of the conductive adhesive tape so as to be precisely attached to even a curved surface.

In addition, a conductive adhesive tape and a method of manufacturing the same, according to the present invention, is configured so that an adhesive material is absorbed into a number of pores formed in a substrate, to thereby increase the amount of an adhesive and enhance an adhesive strength.

In addition, a conductive adhesive tape and a method of manufacturing the same, according to the present invention, is configured by depositing a conductive metal on one surface of a substrate to thereby provide an electrical conductivity and perform an electromagnetic wave shielding function.

BEST MODE

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Here, the size or shape of the components illustrated in the drawings may be shown to be exaggerated for convenience and clarity of illustration. In addition, specifically defined terms may be changed according to the intention or practices of users or operators in consideration of the construction and operation of the present invention. The definition of the terms should be made based on contents throughout the present specification.

FIG. 1is a cross-sectional view of a conductive adhesive tape according to a first embodiment of the present invention.FIG. 2is a partial enlarged view of the conductive adhesive tape according to the first embodiment of the present invention.FIG. 3is an enlarged view of a substrate according to the first embodiment of the present invention.

The conductive adhesive tape according to the first embodiment includes: a substrate10that is formed in a nano-web form of a certain thickness by accumulating ultra-fine fiber strands by a spinning method; and adhesive layers20and/or30that are formed on both and/or one surface of the substrate10.

The substrate10is manufactured in a nano-web form having a plurality of pores12by spinning the polymer material into ultra-fine fiber strands14by a spinning method, and accumulating the ultrafine fiber strands14.

Here, the spinning method that is applied for the present invention may employ any one of electrospinning, air-electrospinning (AES), electrospray, electrobrown spinning, centrifugal electrospinning, and flash-electrospinning.

That is, any of spinning methods of making ultrafine fiber strands in an accumulated form can be also applied to the substrate10and the adhesive layers20and30according to the present invention.

For example, the polymer materials used to make the substrate10in the present invention may be: polyvinylidene fluoride (PVdF), poly(vinylidene fluoride-co-hexafluoropropylene), a perfluoropolymer, polyvinyl chloride, polyvinylidene chloride, or a copolymer thereof; a polyethylene glycol derivative containing polyethylene glycol dialkylether and polyethylene glycol dialkylester; poly(oxymethylene-oligo-oxyethylene); polyoxide containing polyethylene oxide and polypropylene oxide; polyvinyl acetate, poly(vinyl pyrrolidone-vinyl acetate), polystyrene, and a polystyrene acrylonitrile copolymer; a polyacrylonitrile copolymer containing polyacrylonitrile (PAN) and a polyacrylonitrile methyl methacrylate copolymer; or polymethyl methacrylate, a poly methyl methacrylate copolymer, or a mixture thereof.

Since the substrate10is produced by an electrospinning method, the thickness of the substrate10is determined according to the dose of the electrospun polymer material. Thus, it is advantageously easy to make the thickness of the substrate10into a desired thickness. That is, if the dose of the electrospun polymer material is made less, the thickness of the substrate10may be made thin, but if the dose of the electrospun polymer material is increased, the thickness of the substrate10may be made thick, to thus increase strength of the substrate.

In this way, the substrate10is formed in a nano-web form where fiber strands are accumulated by a spinning method, to thus be made into a shape of having a large number of pores without a separate process, and to thus be possible to adjust size of each of the pores according to the dose of the spun polymer material.

In some embodiments, since the substrate10may be fabricated in a nano-web shape having a large number of pores12by electrospinning a polymer material to thereby make ultra-fine fiber strands14and accumulating the ultra-fine fiber strands14in a predetermined thickness, the substrate10can be made thin and further can be made to have a variety of thicknesses. Accordingly, the conductive adhesive tape can be made to have a desired thickness.

In addition, since the substrate10is fabricated in a nano-web shape in which ultra-fine fiber strands14are accumulated, the substrate10has flexibility. Thus, the conductive adhesive tape can be precisely attached to even a portion where a surface to which the conductive adhesive tape is attached is formed in a staircase or corrugated shape.

That is, in the case of the substrate used in the conventional conductive adhesive tape, the substrate10may have poor flexibility. Thus, when the conductive adhesive tape is attached on the surface of the staircase shape or the corrugated portion, the adhesive tape is detached from the surface of the staircase shape or the corrugated portion by rigidity of the substrate. Accordingly, an air layer is formed at a portion where the adhesive tape is detached, thus lowering the adhesive strength of the adhesive tape. However, the substrate10according to the present embodiment has excellent flexibility because of a nano-web form to thus solve the problems of the conventional adhesive tape.

Further, since the substrate10is fabricated in a nano-web shape in which the ultra-fine fiber strands14are accumulated, the tensile strength of the substrate10is strong to thereby prevent the substrate10from being torn by force exerted from the outside and although the substrate10is made thin, the substrate10has a sufficient rigidity.

The conductive adhesive layers20and30may include a first conductive adhesive layer20that is stacked on one surface of the substrate10, and a second conductive adhesive layer30that is stacked on the other surface of the substrate10. Otherwise, a conductive adhesive layer may be stacked on only one surface of the substrate10.

The conductive adhesive layers20and30are prepared in the same way as an electrospinning method that is used for making the substrate10. In other words, a conductive adhesive material having a viscosity suitable for electrospinning is prepared by mixing any one of an electrically conductive metal such as Ni, Cu, and Ag having an excellent electrical conductivity, carbon black, carbon nanotube, graphene, and conductive polymer (PDOT), and a conductive adhesive material with a mixture of an adhesive and a solvent, and the adhesive material is stacked in a predetermined thickness on the surface of the substrate10by using the electrospinning method.

When spinning the conductive adhesive material on the substrate10, the conductive adhesive material is absorbed into the pores formed in the substrate10, thereby making the first conductive adhesive layer20and the second conductive adhesive layer30conduct electricity.

Here, it is desirable that the pores12formed on the substrate10should have diameters in size through which the conductive adhesive material can be absorbed and the viscosity of the conductive adhesive material should have a viscosity that can also be absorbed into the pores12.

Here, in addition to a method of directly spinning a conductive adhesive material on the substrate10, it is also possible to use a method of separately preparing the substrate10, the first conductive adhesive layer20, and the second conductive adhesive layer30, by using an electrospinning method, laminating the first conductive adhesive layer20on one surface of the substrate10in a lamination process, and laminating the second conductive adhesive layer30on the other surface of the substrate10.

The thickness of each of the conductive adhesive layers20and30is determined in accordance with a dose of the spun adhesive material. Therefore, it is possible to make each of the conductive adhesive layers20and30in a desired thickness.

In addition, the conductive adhesive layers20and30are spun in the form of ultra-fine fiber strands, and respectively adhered on both the surfaces of the substrate10. Here, the conductive adhesive material is introduced into the pores12of the substrate10, and thus increases an adhesive strength between each of the adhesive layers20and30and the substrate10. As well, the conductive adhesive layers20and30are introduced into the pores12of the substrate10, and thus increases the amount of the conductive adhesive. Accordingly, in the case that the conductive adhesive tape according to the present embodiment has the same thickness as the conventional conductive adhesive tape, the former has the more amount of the adhesive than the latter, to thereby increase the adhesive strength as much as the amount of the adhesive, and improve the electrical conductivity.

The first adhesive layer20and the second adhesive layer30may be formed into the adhesive layers having an identical adhesive strength. In other words, when the two adhesive layers have an identical adhesive strength, it is preferable to use the two adhesive layers at regions from which they do not need to detach once they are attached thereon.

Also, the conductive adhesive layers20and30can be formed so that one has a slightly poorer adhesive strength than the other. That is, in one embodiment, the adhesive strength of the first adhesive layer20is formed higher than that of the second adhesive layer30, and thus after the conductive adhesive layers20and30are attached on both the surfaces of the substrate10, it is preferable to use the second adhesive layer30at a region from which it is easily detached and to which it is attached again.

A first release film40for protecting the first adhesive layer20is attached on the surface of the first adhesive layer20, and a second release film42for protecting the second adhesive layer30is attached on the surface of the second adhesive layer30.

The first release film40and the second release film42are formed of a different material to each other. In one embodiment, the first release film40is formed of a paper material and the second release film42is formed of a synthetic resin material.

Here, the reason why the first release film40and the second release film42are formed of a different material to each other is to make an attachment force between the first release film40and the first adhesive layer20, and an attachment force between the second release film42and the second adhesive layer30differ from each other.

The reason for this is to prevent the second release film42from being peeled away from the second conductive adhesive layer30when the first release film40is peeled away from the first conductive adhesive layer20in order to make the first conductive adhesive layer20attached on a component.

In other words, if the second release film42is peeled away from the second conductive adhesive layer30when the first release film40is peeled away from the first conductive adhesive layer20, the second adhesive layer30may damage. In order to prevent damage to the conductive adhesive layer, the attachment force between the first release film40and the first conductive adhesive layer20, and the attachment force between the second release film42and the second conductive adhesive layer30can be formed differently to each other.

FIG. 4is a block diagram of a configuration of an electrospinning apparatus for manufacturing a conductive adhesive tape according to a first embodiment of the present invention.

Referring toFIG. 4, the electrospinning apparatus according to the present invention includes: a first mixing tank50in which a polymer material and a solvent are mixed and stored; a second mixing tank52in which a conductive adhesive and a solvent are mixed and stored; a first spinning nozzle54that is connected to a high voltage generator and the second mixing tank52, and forms a first conductive adhesive layer20; a second spinning nozzle56that is connected to a high voltage generator and the first mixing tank50, and forms a substrate10; and a third spinning nozzle58that is connected to a high voltage generator and the second mixing tank52, and forms a second conductive adhesive layer30.

The first mixing tank50is provided with a first agitator70that evenly mixes the polymer material and the solvent and maintains a constant viscosity of the polymer material, and the second mixing tank52is provided with a second agitator72that evenly mixes the conductive adhesive and the solvent and maintains a constant viscosity of the adhesive material.

A collector64is provided below the first through third spinning nozzles54,56, and58, in which the collector64enables the first conductive adhesive layer20, the substrate10, and the second conductive adhesive layer30to be sequentially laminated on one another. In addition, a high voltage electrostatic force of 90 to 120 Kv is applied between the collector64and each of the spinning nozzles54,56, and58, to thereby spin ultra-fine fiber strands14and16, and to thus form an ultra-fine nano-web.

Here, the first spinning nozzle54, the second spinning nozzle56, and the third spinning nozzle58are arranged in the form of a plurality of spinning nozzles, respectively, in which the plurality of spinning nozzles may be arranged in sequence in a chamber or may be arranged in different chambers, respectively.

The first spinning nozzle54, the second spinning nozzle56, and the third spinning nozzle58are provided with an air spray apparatus74, respectively, to thereby prevent the fiber strands14and16spun from the first spinning nozzle unit54, the second spinning nozzle56, and the third spinning nozzle58from fluttering without being smoothly collected to the collector64.

The multi-hole spin pack nozzles used in the present invention are made to set air pressure of air spraying to be in the range of about 0.1 to about 0.6 MPa. In this case, air pressure that is less then about 0.1 MPa, does not contribute to capture and integrate the fiber strands. In the case that air pressure exceeds about 0.6 MPa, the cone of each spinning nozzle is hardened to thus cause a clogging phenomenon of the needle to occur and to thereby cause a spinning trouble to occur.

A conveyor that automatically transfers a first release film40may be used as the collector64, in order to make the first conductive adhesive layer20, the substrate10, and the second conductive adhesive layer30sequentially stacked on the first release film40. Otherwise, a table may be used as collector64, in order to make the first conductive adhesive layer20, the substrate10, and the second conductive adhesive layer30formed in respectively different chambers.

A first release film roll60around which the first release film40is wound is disposed in the front side of the collector64, to thus feed the first release film40onto the top surface of the collector64. In addition, a second release film roll62around which a second release film42is wound is disposed in the rear side of the collector64, to thus feed the second release film42attached on a surface of the second conductive adhesive layer30.

A pressure roller80that pressurizes (or calenders) the first conductive adhesive layer20, the substrate10, and the second conductive adhesive layer30to have a constant thickness is provided at one side of the collector64. A tape roll82is provided, around which the adhesive tapes pressurized via the pressure roller80are wound.

A process for producing an adhesive tape by using an electrospinning apparatus as described above will be described as follows.

First, when the collector64is driven, the first release film40wound on the first release film roll60is released and moved along the top surface of the collector64.

Then, a high voltage electrostatic force is applied between the collector64and the first spinning nozzle54, and thus the conductive adhesive material is made into ultra-fine fiber strands16by the first spinning nozzle54to then be spun to the top surface of the first release film40. As a result, the ultra-fine fiber strands16are accumulated onto the surface of the first release film40to thus form the first conductive adhesive layer20in a non-porous film shape.

When the ultra-fine fiber strands are accumulated, the viscosity of the ultra-fine fiber strands is considerably low, and thus the first conductive adhesive layer20is manufactured in a non-porous film shape.

Here, when the first spinning nozzle54spins the fiber strands16, the air spray apparatus74mounted in the first spinning nozzle54sprays air to the fiber strands16, so that the fiber strands16can be collected and captured on the surface of the first release film40without fluttering.

Then, the first conductive adhesive layer20is completely manufactured, the first conductive adhesive layer20is moved to the bottom of the second spinning nozzle56, and when a high voltage electrostatic force is applied between the collector64and the second spinning nozzle56, the polymer material is made into ultra-fine fiber strands14by the second spinning nozzle56to then be spun on the first conductive adhesive layer20. As a result, the substrate10is formed onto the surface of the first conductive adhesive layer20in an ultra-fine nano-web shape having a large number of pores12.

Here, the conductive adhesive material of the first conductive adhesive layer20is absorbed into the pores12formed on the substrate10.

In addition, when the substrate10is completely manufactured, the substrate10is moved to the bottom of the third spinning nozzle58, and when a high voltage electrostatic force is applied between the collector64and the third spinning nozzle58, the conductive adhesive material is made into ultra-fine fiber strands16by the third spinning nozzle58to then be spun on the surface of the substrate10. As a result, the second a conductive adhesive layer30is formed onto the surface of the substrate10in a non-porous film shape.

In this case, the conductive adhesive material is absorbed into the pores12formed on the substrate10, to thus make the first conductive adhesive layer20and the second conductive adhesive layer30conduct electricity, and to thereby manufacture the conductive adhesive tape.

In addition, the second release film42wound on the second release film roll62is covered on the surface of the second conductive adhesive layer30. In this way, the completed adhesive tape is pressurized in a predetermined thickness as it passes through the pressure roller80. When the pressure roller80presses the first conductive adhesive layer20and the second conductive adhesive layer30, the adhesive material is absorbed into the pores12formed on the substrate10more effectively, and thus the first conductive adhesive layer20and the second conductive adhesive layer30conduct electricity more reliably.

Here, in the case that only one adhesive layer is provided in the substrate10, a process of forming the second conductive adhesive layer is omitted.

The first conductive adhesive layer20and the second conductive adhesive layer30may be formed to have an identical adhesive strength, or any one of the two conductive adhesive layers20and30may be formed to have a weaker adhesive strength than the other of the two conductive adhesive layers20and30.

Further, in addition to the above-described method, the following method may be applicable in which the substrate10and the conductive adhesive layers20and30are each separately produced, and then the first conductive adhesive layer20is disposed on one surface of the substrate10while the second conductive adhesive layer30is disposed on the other surface of the substrate10, to then mutually laminate the substrate10and each of the first and second conductive adhesive layers20and30and to thus produce the conductive adhesive tape.

FIG. 5is a cross-sectional view of a conductive adhesive tape according to a second embodiment of the present invention.

The conductive adhesive tape according to the second embodiment includes: a substrate10that is formed in a nano-web form of a certain thickness by accumulating ultra-fine fiber strands by a spinning method; a first conductive adhesive layer20that is formed on one surface of the substrate10; an electromagnetic wave shielding layer80that is stacked on the other surface of the substrate, for shielding electromagnetic waves; and a second conductive adhesive layer30that is stacked on the surface of the electromagnetic wave shielding layer80.

Since the substrate10, the first conductive adhesive layer20, and the second conductive adhesive layer30according to the second embodiment are of the same structures as those described in the first embodiment, the description thereof will be omitted.

The electromagnetic wave shielding layer80is formed by performing deposition (sputtering) of a metal having an electrical conductivity such as copper (Cu) or aluminum (Al) on the substrate10.

The electromagnetic wave shielding layer80is deposited on the surface of the substrate10that is formed in a nano-web form having a plurality of pores12, to thus prevent peeling off of the electromagnetic wave shielding layer80and improve the electromagnetic wave shielding performance.

Thus, the conductive adhesive tape according to the second embodiment includes the first conductive adhesive tape20and the second conductive adhesive tape30both having the electrically conductive material, to thus provide electrically conductive performance, and also includes the electromagnetic wave shielding layer80formed of an electrically conductive metal, to thus further enhance electrically conductive performance as well as shield electromagnetic waves.

A method of manufacturing a conductive adhesive tape according to the second embodiment as described above will follow. A high viscosity of the first conductive adhesive layer20is formed on one surface of the substrate10by using the electrospinning device as described above, the electromagnetic wave shielding layer80is formed on the other surface of the substrate10by depositing an electrically conductive metal on the other surface of the substrate10, and the second conductive adhesive layer30is stacked on the surface of the electromagnetic wave shielding layer80, by spinning a conductive adhesive material on the surface of the electromagnetic wave shielding layer80by using an electrospinning device, or by the other method other than such a spinning method, to thereby manufacture the conductive adhesive tape.

The first conductive adhesive layer20is formed by spinning a conductive adhesive material having the high viscosity performance on the substrate10. Accordingly, when the conductive adhesive material is spun on one surface of the substrate10, the conductive adhesive material is introduced into the pores12formed on the substrate10and then prevented from leaking from the other surface of the substrate10. As a result, a problem that occurs due to the adhesive material when depositing the electromagnetic wave shielding layer80on the other surface of the substrate10can be solved.

In addition to the above-described manufacturing method, a method of separately preparing the first conductive adhesive layer20by using the electrospinning apparatus and then laminating the first conductive adhesive layer20on one surface of the substrate10is also applicable for the present invention. That is, the substrate10is formed by using one electrospinning apparatus, the electromagnetic wave shielding layer80is formed on one surface of the substrate10by depositing the electrically conductive metal on one surface of the substrate10, and the second conductive adhesive layer30is stacked on the surface of the electromagnetic wave shielding layer80by spinning the conductive adhesive material on the surface of the electromagnetic wave shielding layer80. Then, the first conductive adhesive layer20is prepared by using another electrospinning apparatus, and then is laminated on the substrate10by using a thermal compression bonding method.

Here, since the first conductive adhesive layer is laminated on one surface of the substrate10, it is possible to prevent the adhesive material from leaking from the other surface of the substrate10through the pores12of the substrate10.

FIG. 6is a cross-sectional view of a conductive adhesive tape according to a third embodiment of the present invention.

The conductive adhesive tape according to the third embodiment includes: a substrate10that is formed in a nano-web form of a certain thickness by accumulating ultra-fine fiber strands by a spinning method; a non-porous film layer120formed on one surface of the substrate10; a second conductive adhesive layer30that is stacked on the non-porous film layer120; and a first conductive adhesive layer20that is laminated on the other surface of the substrate10.

The conductive adhesive tape according to the third embodiment may be manufactured by separately preparing the substrate10and the first conductive adhesive layer20; and cross-laminating the substrate10and the first conductive adhesive layer20in a lamination process. Then, the conductive adhesive tape according to the third embodiment may be formed by depositing the electromagnetic wave shielding layer on one surface of the substrate.

Since the substrate10, the first conductive adhesive layer20, and the second conductive adhesive layer30according to the third embodiment are of the same structures as those described in the first embodiment, the description thereof will be omitted.

The non-porous film layer120is formed by electrospinning a polymer material containing PU (polyurethane) or TPU (thermoplastic polyurethane) into ultra-fine fiber strands and accumulating the ultrafine fiber strands, in which the PU or TPU is dissolved in a solvent, and is formed in a non-porous shape having no pores without any heat treatment.

Then, the non-porous film layer120includes an electrically conductive metal such as Ni, Cu, and Ag having an excellent electrical conductivity, and a conductive material such as carbon blocks, carbon nanotubes, graphene, conductive polymers (PDOT), thus having an electrical conductivity.

Here, the non-porous film layer120is stacked on the substrate10to thus play a role of blocking the surface of the substrate10and preventing the conductive adhesive material from being introduced into the pores12of the substrate10when forming the second conductive adhesive layer30.

When spinning the conductive adhesive layer on the substrate10by using the electrospinning apparatus, the conductive adhesive material is absorbed into the pores12of the substrate10. In this case, in the case that the conductive adhesive material is excessively absorbed into the pores12of the substrate10, the conductive adhesive material is leaked from the other side of the substrate10. In this case, when depositing the electromagnetic wave shielding layer on the surface of the substrate10for providing the electrical conductive performance and electromagnetic wave shielding performance, the adhesive material is present on the surface of the substrate10and thus there is a problem during the deposition operation.

In this way, when a step of depositing an electromagnetic wave shielding layer on the substrate is added, a method of separately preparing the substrate and the conductive adhesive layer and then laminating the substrate and the conductive adhesive layer is more desirable than a method of directly spinning the conductive adhesive layer on the substrate.

FIG. 7is a block diagram of an electrospinning apparatus for producing the conductive adhesive tape according to the third embodiment of the present invention.

The electrospinning apparatus according to the third embodiment includes: a first electrospinning device130that manufactures a substrate10, a non-porous film layer120formed on one surface of the substrate10, and a second conductive adhesive layer30that is stacked on the non-porous film layer120; a second electrospinning device140for producing a first conductive adhesive layer20; and a lamination device150for laminating the substrate10and the first conductive adhesive layer20.

The first electrospinning device120includes: a collector138on which a second release film42is moved; a first spinning nozzle132that is disposed on the upper side of the collector138, and that spins a conductive adhesive material on the second release film42to thus form a second conductive adhesive layer30; a second spinning nozzle134that spins a polymer material containing PU or TPU to thus form the non-porous film layer120; and a third spinning nozzle136that spins a polymer material on the non-porous film layer120to thus form the substrate10.

In addition, the second electrospinning device140includes: a collector144on which a first release film40is moved; and a spinning nozzle142that is disposed on the upper side of the collector144, and that spins a conductive adhesive material on the first release film40to thus form a first conductive adhesive layer20.

A first pressing roller122that makes the substrate10, the non-porous film layer120, and the second conductive adhesive layer30have a constant thickness, respectively, is disposed at one side of the first electrospinning device130, and a second pressing roller124that makes the first conductive adhesive layer20have a constant thickness is disposed at one side of the second electrospinning device140.

The collector and the spinning nozzles according to the third embodiment are of the same construction and operation as those described in the first embodiment, and thus the detailed description thereof will be omitted.

A process for producing the conductive adhesive tape by using the electrospinning apparatus according to the third embodiment of the present invention as described above will be described as follows. First, when the collector138is driven, the second release film42is moved along the top surface of the collector138.

Then, a high voltage electrostatic force is applied between the collector138and the first spinning nozzle132, and thus the conductive adhesive material is made into ultra-fine fiber strands by the first spinning nozzle132to then be spun to the top surface of the second release film42. As a result, the ultra-fine fiber strands are accumulated onto the surface of the second release film42to thus form the second conductive adhesive layer30in a non-porous film shape.

Then, the second conductive adhesive layer30is moved into the lower portion of the second spinning nozzle134. Then, a high voltage electrostatic force is applied between the collector138and the second spinning nozzle134, and thus a polymer material containing PU or TPU and a conductive material is spun on the second conductive adhesive layer30by the second spinning nozzle134, to thus form the non-porous film layer120.

Then, the non-porous film layer120is moved into the lower portion of the third spinning nozzle136. Then, a high voltage electrostatic force is applied between the collector138and the third spinning nozzle136, and thus a polymer material is made into ultra-fine fiber strands by the third spinning nozzle136to then be spun to the non-porous film layer120. As a result, the substrate10of the ultra-fine nano-web form having a plurality of pores12is formed on the non-porous film layer120.

Then, when the collector144of the second electrospinning device is driven, the first release film40is moved along the upper surface of the collector144. Then, a high voltage electrostatic force is applied between the collector144and the spinning nozzle142, and thus the conductive adhesive material is made into ultra-fine fiber strands by the spinning nozzle142to then be spun to the top surface of the first release film40. As a result, the ultra-fine fiber strands are accumulated onto the surface of the first release film40to thus form the first conductive adhesive layer20in a non-porous film shape.

Thus, when the substrate10and the first conductive adhesive layer20are completely manufactured, the substrate10and the first conductive adhesive layer20are supplied to the laminating device150, and the laminating device150laminates the substrate10and the first conductive adhesive layer20, to thereafter form the conductive adhesive tape and wind the conductive adhesive tape on an adhesive tape roll152.

FIG. 8is a cross-sectional view of a conductive adhesive tape according to a fourth embodiment of the present invention.

The conductive adhesive tape according to the fourth embodiment includes: a first substrate160that is formed in a nano-web form of a certain thickness by accumulating ultra-fine fiber strands by a spinning method; a non-porous film layer120formed on one surface of the first substrate160; a second substrate162that is stacked on the non-porous film layer120; a second conductive adhesive layer30that is formed on the second substrate162; and a first conductive adhesive layer20that is laminated on the other surface of the first substrate160.

The conductive adhesive tape according to the fourth embodiment as described above is of the same structure and manufacturing process as those of the conductive adhesive tape according to the third embodiment above. However, the substrate is configured to include the first and second substrates, and the second conductive adhesive layer30is spun on the second substrate162having a plurality of pores, to thus enhance the adhesive strength of the conductive adhesive tape.

FIG. 9is a cross-sectional view of a conductive adhesive tape according to a fifth embodiment of the present invention.

The conductive adhesive tape according to the fifth embodiment includes: a first substrate170that is formed in a nano-web form of a certain thickness by accumulating ultra-fine fiber strands by a spinning method; a non-porous film layer120formed on one surface of the first substrate170; a first conductive adhesive layer20that is laminated on the other surface of the first substrate170; and a double-sided adhesive tape26that is laminated on the non-porous film layer120.

The first substrate170and the non-porous film layer120formed on the first substrate170are of the same structures as those of the substrate10and the non-porous film layer120formed on the substrate10described in the third embodiment, and the configuration of laminating the first conductive adhesive layer20on one surface of the first substrate170is the same as that of laminating the first conductive adhesive layer20on one surface of the substrate10described in the third embodiment.

The conductive double-sided tape26includes: a second substrate172that is formed in a nano-web form of a certain thickness by accumulating ultra-fine fiber strands by a spinning method; a second conductive adhesive layer22formed on one surface of the second substrate172; and a third conductive adhesive layer24formed on the other surface of the second substrate172.

Here, the structure of the conductive double-sided tape26is the same as that of the conductive adhesive tape described in the first embodiment.

The conductive adhesive tape according to the fifth embodiment is manufactured by preparing the first substrate170and the non-porous film layer120by one electrospinning device, preparing the first conductive adhesive layer20by another electrospinning device, preparing the double-sided tape26by another electrospinning device, primarily laminating the first conductive adhesive layer20on one surface of the first substrate170, and secondarily laminating the double-sided tape26on the non-porous film layer120.

FIG. 10is a cross-sectional view of a conductive adhesive tape according to a sixth embodiment of the present invention.

The conductive adhesive tape according to the sixth embodiment is configured to include: a substrate10that is formed in a nano-web form having a plurality of pores12by the same electrospinning method as that of the substrate10described in the first embodiment; and conductive adhesive layers210and/or220that are formed on both surfaces or one surface of the substrate10, by using any one of a casting method, a coating method, and gravure coating method.

That is, the conductive adhesive tape according to the third embodiment is configured by preparing the substrate10by the electrospinning method, and then stacking conductive adhesive layers210and/or220on both surfaces or one surface of the substrate10, by using conventional various methods.

Then, an electromagnetic wave shielding layer80for shielding electromagnetic waves is stacked on one surface of the substrate10. That is, the electromagnetic wave shielding layer80is formed by depositing a conductive metal on one surface of the substrate10.

As described above, the present invention has been described with respect to particularly preferred embodiments. However, the present invention is not limited to the above embodiments, and it is possible for one who has an ordinary skill in the art to make various modifications and variations, without departing off the spirit of the present invention. Thus, the protective scope of the present invention is not defined within the detailed description thereof but is defined by the claims to be described later and the technical spirit of the present invention.

INDUSTRIAL APPLICABILITY

The conductive adhesive tape according to the present invention can be made thin, can improve the adhesive strength, can be precisely attached to even a curved surface, and can prevent the adhesive layer from remaining on the surface of a component when the conductive adhesive tape is separated from the component, and may be applied to a variety of industrial fields.