KR100953555B1 - Transparent Conductive Tape and Method for Preparing the Same - Google Patents

Abstract

The present invention provides a transparent electrically conductive tape and a method of manufacturing the same. The conductive tape of the present invention comprises the steps of printing a conductive paste pattern on the substrate; Curing the paste; Attaching a transparent tape to the cured paste to transfer the conductive paste pattern; Separating the substrate and the tape; And winding the tape, and thus the electrically conductive tape provided is applicable to a display or the like because it is transparent.

Conductive tape, transparency, paste pattern, gravure printing, display

Description

Transparent conductive tape and method for preparing the same

The present invention relates to an electrically conductive tape and a method of manufacturing the same, and more particularly, to a method of manufacturing a transparent electrically conductive tape by transferring a conductive paste pattern to an adhesive tape, since the conductive tape provided is transparent. It can be used for display and the like.

Electrically conductive tapes are generally composed of a conductive metal foil such as copper and aluminum, a conductive adhesive and a release paper. Such a conductive tape is generally configured by adhering a conductive adhesive layer of a release paper coated with a conductive adhesive and a conductive metal foil such as aluminum foil or copper foil, or by treating the surface of the conductive metal foil with a release agent to be wound up without a release paper. to be. In this case, the conductive adhesive refers to an adhesive having a conductive material powder of a predetermined amount or more added to an adhesive material prepared by dissolving a rubber or acrylic resin in an organic solvent to maintain proper conductivity according to the amount of the metal powder.

However, conventional conductive adhesive tapes composed of a metal foil layer and a conductive adhesive layer are easily wrinkled or torn because of poor flexibility and elongation of the metal foil, and do not tear perpendicularly to the longitudinal direction when cut by hand, and the surface There is a disadvantage that the color is not transparent because the metal color of aluminum or copper appears as it is.

Accordingly, the present invention is to solve the above problems, an object of the present invention is to provide a transparent electrically conductive tape and a method of manufacturing the same.

Conventional conductive tape has a problem in that the excessively conductive particles are added to the pressure-sensitive adhesive is irregularly arranged, opaque, but the electrically conductive tape according to the present invention is possible to uniformly arrange the conductive particles by applying a conductive paste In addition, the transparency is excellent, and there is an advantage that can provide sufficient conductivity without adding an excessive amount of conductive particles.

According to the invention,

Printing a conductive paste pattern on the substrate;

Curing the paste;

Attaching a transparent tape to the cured paste to transfer the conductive paste pattern;

Separating the substrate and the tape; And

A method for producing a transparent electrically conductive tape comprising the step of winding the tape is provided.

In addition, according to the present invention, there is provided a transparent electrically conductive tape, characterized in that a conductive pattern is formed on the transparent tape.

Hereinafter will be described in more detail with respect to the present invention.

The electrically conductive tape according to the embodiment of the present invention prints a conductive paste pattern made of a polymer binder and conductive particles on an opaque or transparent substrate, and then cures it, attaches a transparent tape thereto to transfer the conductive paste pattern, and It is characterized in that the tape is produced by separating the tape and then winding the tape.

In the embodiment of the present invention, the conductive paste is made of a polymer binder and conductive particles, wherein the polymer binder can be uniformly dispersed conductive particles, and serves to improve printability. In a preferred embodiment, the polymeric binder is preferably added in 10 ~ 100% of the weight of the conductive particles, when the addition amount is 10% or less, the dispersibility of the conductive particles is lowered, poor printability, 100% In the above case, there is a problem that the conductivity of the final product is poor.

The polymer binder is composed of a resin, a curing initiator, a solvent, and the like, and the resin that can be used in the production of the electrically conductive tape of the present invention may be both a thermosetting resin or a UV curable resin depending on the curing method. In the case of thermosetting resins, for example, but not limited to, epoxy resins, melamine resins, polyurethane resins, polyimide resins, unsaturated polyester resins, alkyd resins, and the like can be used. However, for example, polyester resins, polydiol resins, acrylic resins can be used.

On the other hand, when a thermosetting resin is used, no separate curing initiator is required, but when a UV curable resin is used, a curing initiator is required, and the present invention is not particularly limited thereto. For example, aliphatic amines, aromatic amines, Amides, acid anhydrides, phenols, imidazole derivatives, and the like may be used, and the amount thereof is preferably added within 10% of the UV curable resin.

In addition, the kind of the solvent used in the polymer binder is not particularly limited, and any solvent may be used as long as it can dissolve the polymer resin. Preferably a solvent having a high boiling point such that the polymer resin does not dry during printing, that is, a boiling point of 150 ° C. or higher, such as Terpineol, Isophorone, BCA (Butyl Carbitol Acetate), Glycols are particularly preferred. If necessary, dispersion stabilizers may be added for uniform dispersibility, and thickeners such as nitrocellulose and ethyl cellulose may be added to ensure viscosity suitable for printing.

In addition, as the conductive particles dispersed in the polymer binder, silver, copper, or nickel may be used alone or in an alloy, and most preferably silver or copper may be used. Although the particle diameter of the said electroconductive particle is not specifically limited, 100 nm-10 micrometers are preferable, The form of particle | grains is not specifically limited, either spherical shape, a flake shape, etc. can be used.

A conductive paste made of a polymer binder and conductive particles is printed on the substrate as described above. At this time, the type of the substrate to which the conductive paste pattern is applied may be any substrate capable of printing the conductive paste pattern, and both transparent or opaque ones may be used, and the present invention is not particularly limited thereto, but polyethylene terephthalate, Polyesters such as polybutyrene terephthalate, polyethylene naphthalate and the like, polyphenylene sulfate, polycarbonate, polyetherether ketone, polymethylmethacrylate, polystyrene, polyamide, polyimide, cellulose propionate, polysulfone, or Plastic films of polyolefins, such as polyethylene and polypropylene, or glass may be used, and polyethylene terephthalate (PET) is most preferred in view of low cost and high versatility.

The method of printing the conductive paste pattern is not particularly limited thereto, but a method of offset, inkjet, and screen may be applied, and gravure printing that can be continuously manufactured in a roll state is most preferable. In the case of printing a pattern by a gravure printing method, a cylindrical roll made of a metal with a pattern was engraved, a conductive paste was injected, and the surface of the roll was scratched with a doctor blade made of metal so that the paste remained only on the patterned part.

At this time, the shape of the conductive paste pattern is not particularly limited, and a lattice, a ladder, a honeycomb shape, or the like may be used. In addition, in order to manufacture a transparent conductive tape, the line width of the pattern should be reduced to 100 μm or less, and the interval between the patterns should be 100 μm or more to ensure sufficient openings as a whole.

As such, the printed conductive paste pattern is cured by a known method, for example, the film printed in a roll state is cured by passing through a curing oven, and in the case of thermal curing, 100 to 150 so that the polymer resin can be completely cured. It is preferable to cure at a temperature of ℃. The transparent adhesive tape is attached to the conductive paste pattern to transfer the pattern. At this time, the tape to be used is a pressure-sensitive adhesive treatment on one side to be able to easily bring the conductive pattern from the plastic substrate, the opposite side is preferably used a release treatment.

The pressure-sensitive adhesive applied to one side of the tape is not particularly limited, but acrylic, urethane, or silicone may be used. Preferably, acrylic pressure-sensitive adhesive is used.

For example, the acrylic pressure sensitive adhesive is composed of a base polymer, a crosslinking agent, a plasticizer, a filler, an antioxidant, an ultraviolet absorber, and a silane coupling agent, and the base polymer used therein preferably has a weight average molecular weight of 300,000 to 2,500,000, and the acrylic pressure sensitive adhesive Various alkyl (meth) acrylates can be used as a monomer used for the acrylic polymer which is a base polymer of. Specific examples of such alkyl (meth) acrylates include (meth) acrylate, (meth) ethylacrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and the like, which may be used alone or in combination. Can be. Epoxy, isocyanate, imine, metal chelate, etc. may be used as the crosslinking agent, and most preferably isocyanate may be used.

The adhesive is attached to one surface of the cured paste pattern to transfer the conductive paste pattern, and then the production is completed by separating the substrate and the tape and winding the tape. Transcription, separation and winding of the pattern can be performed by any method known to those skilled in the art.

In addition, in one embodiment of the present invention, there is provided a transparent electrically conductive tape, characterized in that the conductive pattern is formed on the transparent tape. The conductive pattern is formed by printing a conductive paste made of conductive particles and a polymer binder on a substrate and then transferring the transparent paste onto a transparent tape. At this time, the shape of the pattern is not particularly limited, but may be a grid, ladder, or honeycomb, the line width of the pattern is 100㎛ or less, the spacing between the patterns is 100㎛ or more.

Among the conductive pastes, the polymer binder is composed of a resin, a curing initiator, a solvent, and the like. In this case, the thermosetting resin or the UV curable resin may be used depending on the curing method. In the case of thermosetting resins, for example, but not limited to, epoxy resins, melamine resins, polyurethane resins, polyimide resins, unsaturated polyester resins, alkyd resins, and the like can be used. However, for example, polyester resins, polydiol resins, acrylic resins can be used. When a thermosetting resin is used, a separate curing initiator is not required, but when a UV curable resin is used, a separate curing initiator is required, although not particularly limited thereto, for example, an aliphatic amine, an aromatic amine, Amides, acid anhydrides, phenols, imidazole derivatives and the like can be used.

The type of the solvent used in the polymer binder is not particularly limited, and any solvent may be used as long as it can dissolve the polymer resin. Preferably a solvent having a high boiling point such that the polymer resin does not dry during printing, that is, a boiling point of 150 ° C. or higher, such as Terpineol, Isophorone, BCA (Butyl Carbitol Acetate), Glycols are particularly preferred. If necessary, dispersion stabilizers may be added for uniform dispersibility, and thickeners such as nitrocellulose and ethyl cellulose may be added to ensure viscosity suitable for printing.

In addition, as the conductive particles dispersed in the polymer binder, silver, copper, or nickel may be used alone or in an alloy, and most preferably silver or copper may be used. Although the particle diameter of the said electroconductive particle is not specifically limited, 100 nm-10 micrometers are preferable, The form of particle | grains is not specifically limited, either spherical shape, a flake shape, etc. can be used.

A conductive paste made of a polymer binder and conductive particles is printed on the substrate as described above. In this case, any type of substrate to which the conductive paste pattern is applied may be used, and any substrate capable of printing a conductive paste pattern may be used, and may be transparent or opaque. Either one may be used, but is not particularly limited thereto, but polyesters such as polyethylene terephthalate, polybutyrene terephthalate, polyethylene naphthalate, polyphenylene sulfate, polycarbonate, polyetheretherketone, polymethylmethacryl Latex, polystyrene, polyamide, polyimide, cellulose propionate, polysulfone, or plastic films of polyolefins such as polyethylene and polypropylene, or glass may be used, and polyethylene tere in terms of low cost and high versatility Phthalates (PET) are most preferred.

In a preferred embodiment of the present invention, the paste pattern printing is not particularly limited thereto, but may be printed by a method selected from gravure printing, offset printing, inkjet printing or screen printing, and in the present invention, a gravure printing method is particularly used. It is preferable to print the paste pattern.

The conductive paste pattern printed as described above is attached to a tape on which one side is treated with an adhesive and the other side is released, the tape is separated from the substrate, and the pattern is transferred to the tape.

Meanwhile, the pressure-sensitive adhesive applied to one side of the tape is not particularly limited, but acrylic, urethane, or silicone may be used. Preferably, acrylic pressure-sensitive adhesive is used. For example, the acrylic pressure sensitive adhesive is composed of a base polymer, a crosslinking agent, a plasticizer, a filler, an antioxidant, an ultraviolet absorber, and a silane coupling agent, and the base polymer used therein preferably has a weight average molecular weight of 300,000 to 2,500,000, and the acrylic pressure sensitive adhesive Various alkyl (meth) acrylates can be used as a monomer used for the acrylic polymer which is a base polymer of. Specific examples of such alkyl (meth) acrylates include (meth) acrylate, (meth) ethylacrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and the like, which may be used alone or in combination. Can be. Epoxy, isocyanate, imine, metal chelate, etc. may be used as the crosslinking agent, and most preferably isocyanate may be used.

As described above, the conductive tape provided according to the present invention has a horizontal conductivity and is provided in a transparent form, and can be applied to a display or the like.

Hereinafter, the present invention will be described through examples, which do not limit the present invention.

Example

Example 1

A conductive paste pattern was gravure printed on one side of a polyethylene terephthalate film (A4300, manufactured by Toyobo) having a thickness of 100 μm, and then cured in a curing oven at 150 ° C. After attaching the cured paste pattern to a transparent tape treated with an acrylic adhesive, the pattern was transferred to a tape, and then the tape on which the pattern was transferred was separated from the substrate and wound up. Thus, the shape of the pattern provided was a horizontal and horizontal lattice pattern, the line width of the conductive pattern was 10 mu m, and the spacing between the patterns was 200 mu m.

2. Transmittance Measurement

The transmittance was measured by attaching the transparent tape on which the pattern was transferred to glass, and in this example, the transmittance was measured using a model name UV-3101 manufactured by Shimadzu. As a result of measurement, the transmittance | permeability of the conductive tape which concerns on this invention was 82%, and the general conductive tape (AMIC company, brand name DK-102) was 0%.

In the conventional conductive tape, the conductive particles are irregularly arranged inside the pressure-sensitive adhesive and opaque due to the addition of excess conductive particles. However, the conductive tape provided in accordance with the present invention transfers the electrically conductive paste pattern to the adhesive tape, thereby providing a transparent tape. Since it is provided with, it can be applied to a display or the like.

Claims (21)

Printing a conductive paste pattern on the substrate; Curing the paste; Attaching a transparent tape to the cured paste to transfer the conductive paste pattern; Separating the substrate and the tape; And A method for producing a transparent electrically conductive tape comprising the step of winding the tape. The method of claim 1, wherein the conductive paste is made of conductive particles and a polymer binder. The method of claim 2, wherein the conductive particles are silver, copper or nickel. The method of claim 2, wherein the polymeric binder is composed of a resin, a curing initiator, and a solvent. The method of claim 4, wherein the resin is selected from the group consisting of epoxy resins, melamine resins, polyurethane resins, polyimide resins, unsaturated ester resins, alkyd resins, polydiol resins, and acrylic resins, and the curing initiator is selected from aliphatic amines. And aromatic amines, amides, acid anhydrides, phenols, and imidazole derivatives. The method of claim 1, wherein the substrate is polyethylene terephthalate, polybutyrene terephthalate, polyester such as polyethylene naphthalate, polyphenylene sulfate, polycarbonate, polyether ether ketone, polymethyl methacrylate, polystyrene, polyamide , Polyimide, cellulose propionate, polysulfone, or a plastic film of polyolefin such as polyethylene or polypropylene, or a method for producing a transparent electrically conductive tape, characterized in that the glass. The method of claim 1, wherein the paste pattern printing is selected from gravure printing, offset printing, inkjet printing, or screen printing. The method of claim 1, wherein the paste pattern has a lattice, a ladder, or a honeycomb shape. The method of manufacturing a transparent electrically conductive tape according to claim 1, wherein the line width of the paste pattern is 100 m or less, and the interval between the patterns is 100 m or more. The method of claim 1, wherein the curing of the paste is carried out at a temperature of 100 ~ 150 ℃. The method of claim 1, wherein one side of the tape is treated with an adhesive, and the adhesive is acrylic, urethane, or silicone. Transparent tape; And A transparent electrically conductive tape comprising a conductive pattern formed by printing a paste made of conductive particles and a polymeric binder on a substrate and then transferring the paste onto the transparent tape. 13. The transparent conductive tape of claim 12, wherein the pattern is in the form of a lattice, ladder, or honeycomb. 13. The transparent conductive tape according to claim 12, wherein the line width of the pattern is 100 mu m or less, and the spacing between patterns is 100 mu m or more. delete 13. The transparent electrically conductive tape according to claim 12, wherein the conductive particles are silver, copper or nickel. The transparent electrically conductive tape of claim 12, wherein the polymer binder is composed of a resin, a curing initiator, and a solvent. 18. The method of claim 17, wherein the resin is selected from the group consisting of epoxy resins, melamine resins, polyurethane resins, polyimide resins, alkyd resins, unsaturated ester resins, polydiol resins, and acrylic resins, wherein the curing initiator is selected from aliphatic amines. And aromatic amines, amides, acid anhydrides, phenols, and imidazole derivatives. The method of claim 12, wherein the substrate is polyethylene terephthalate, polybutyrene terephthalate, polyester such as polyethylene naphthalate, polyphenylene sulfate, polycarbonate, polyether ether ketone, polymethyl methacrylate, polystyrene, polyamide , Polyimide, cellulose propionate, polysulfone, or a plastic film of polyolefin such as polyethylene or polypropylene, or a transparent electrically conductive tape, characterized in that the glass. 13. The transparent conductive tape of claim 12, wherein the paste pattern printing is selected from gravure printing, offset printing, inkjet printing or screen printing. The transparent conductive tape of claim 12, wherein one side of the tape is treated with an adhesive, and the adhesive is acrylic, urethane, or silicone.