KR20170128743A - Multi layered optical adhesive sheet, method preparing multi layered optical adhesive sheet and touch screen panel - Google Patents

Multi layered optical adhesive sheet, method preparing multi layered optical adhesive sheet and touch screen panel Download PDF

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KR20170128743A
KR20170128743A KR1020160059088A KR20160059088A KR20170128743A KR 20170128743 A KR20170128743 A KR 20170128743A KR 1020160059088 A KR1020160059088 A KR 1020160059088A KR 20160059088 A KR20160059088 A KR 20160059088A KR 20170128743 A KR20170128743 A KR 20170128743A
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South Korea
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meth
sensitive adhesive
adhesive layer
adhesive sheet
acrylate
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KR1020160059088A
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Korean (ko)
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KR102044248B1 (en
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서주용
이수은
윤찬오
김장순
박은경
이한나
김상환
이주현
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주식회사 엘지화학
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    • C09J7/02—
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/062—Copolymers with monomers not covered by C09J133/06
    • C09J133/066—Copolymers with monomers not covered by C09J133/06 containing -OH groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/10—Homopolymers or copolymers of methacrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/113—Anti-reflection coatings using inorganic layer materials only
    • G02B1/115—Multilayers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays

Abstract

Provided is an optical adhesive sheet having a multi-layered structure comprising: a middle adhesive layer; and an outer adhesive layer laminated in both surfaces of the middle adhesive layer. The outer adhesive layer contains a semi hardening product of a first acryl-based resin. The middle adhesive layer contains a hardening product of a second acryl-based resin. The first acryl-based resin is (meth)acryloyloxy (C2-C14 alkylene) isocyanate modified urethane acrylate copolymer resin which is formed by which a copolymer resin of a first (meth)acrylic ester monomer and (meth)acrylic acid monomer containing a hydroxyl group with (meth)acryloyloxy (C2-C14 alkylene) and (meth)acryloyloxy (C2-C14 alkylene) isocyanate are side chain modified by means of a reaction of the hydroxy group and urethane. The second acryl-based resin is an acryl copolymer resin of a second (meth)acrylic acid ester-based monomer and hydroxy (C2-C8 alkyl) (meth)acrylate. The optical adhesive sheet having a multi-layered structure has excellent durability and an excellent step accepting performance to be suitable for being used as an adhesive layer laminating touch screen panels having diverse structures and materials on glass, plastic films and the like.

Description

TECHNICAL FIELD [0001] The present invention relates to a pressure-sensitive adhesive sheet for optical use having a multi-layer structure, a method for manufacturing the pressure-

To a method of manufacturing an optical pressure-sensitive adhesive sheet having a multi-layer structure, and to a touch screen panel.

2. Description of the Related Art In recent years, electronic devices such as a PDA, a mobile communication terminal, or a navigation system for a vehicle have formed a large market. In such electronic devices, the technical goals pursued are mainly thinning, lightening, low power consumption, high resolution and high brightness.

The electronic apparatus is provided with a touch screen panel on an input operation unit. The touch screen panel has a multilayer structure including an outermost cover window layer and is formed by laminating using an optical adhesive sheet.

The optical pressure-sensitive adhesive sheet is optically transparent and has various properties such as touch sensitivity and durability.

An embodiment of the present invention provides a pressure-sensitive adhesive sheet for a multi-layer structure excellent in durability and excellent in level difference absorbency.

Another embodiment of the present invention provides a method for producing the above-mentioned multi-layered optical adhesive sheet.

Another embodiment of the present invention provides a touch screen panel to which the optical adhesive sheet of the multi-layer structure is applied.

In one embodiment of the present invention, the intermediate adhesive layer; And an outer pressure-sensitive adhesive layer laminated on both surfaces of the intermediate pressure-sensitive adhesive layer, wherein the outer pressure-sensitive adhesive layer comprises a semi-cured product of a first acrylic resin, the intermediate pressure- (Meth) acryloyloxy (C2 to C14 alkylene) isocyanate is reacted with the hydroxyl group by a urethane reaction with a copolymer resin of a first (meth) acrylic ester monomer and a hydroxy group-containing (meth) acrylic acid monomer, (C2 to C14 alkylene) isocyanate-modified urethane acrylate copolymer resin formed by side chain modification and the second acrylic resin is a (meth) acrylate monomer and a hydroxy (C2 to C8 alkyl ) (Meth) acrylate, which is an acrylic copolymer resin of (meth) acrylate.

In another embodiment of the present invention, a composition for forming an outer pressure-sensitive adhesive layer of a solvent type including a first acrylic resin is prepared, a composition for forming the outer pressure-sensitive adhesive layer is coated on a predetermined substrate, To form an outer adhesive layer; Applying a non-solvent type intermediate adhesive layer composition containing a second acrylic resin to another predetermined substrate and then photo-curing the intermediate adhesive layer to produce an intermediate adhesive layer; And a step of laminating the outer pressure-sensitive adhesive layer on both sides of the intermediate pressure-sensitive adhesive layer to produce a pressure sensitive adhesive sheet for a multilayer structure, wherein the first acrylic resin is (meth) acryloyloxy (C2 to C14 alkyl (Meth) acryloyloxy (C2 to C14 alkylene) isocyanate is added to the copolymer resin of the first (meth) acrylic ester monomer and the hydroxy group-containing (meth) acrylic acid monomer as the isocyanate-modified urethane acrylate copolymer resin, And the second acrylic resin is an acrylic copolymer resin of a second (meth) acrylic acid ester monomer and a hydroxy (C2 to C8 alkyl) (meth) acrylate. A method for producing an adhesive sheet is provided.

In another embodiment of the present invention, a transparent electrode layer having a conductive layer formed on at least one surface thereof; A cover window layer; And an adhesive sheet for optical use having the multi-layer structure attached between the transparent electrode layer and the cover windowing layer or between the transparent electrode layer and the touching screen panel.

The optical pressure-sensitive adhesive sheet of the multi-layer structure is excellent in durability and excellent in level difference absorbency, and is suitable for use as an adhesive layer for laminating touch screen panels of various structures and materials to glass, plastic film and the like.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view of an optical adhesive sheet having a multilayer structure according to an embodiment of the present invention. Fig.
2 is a schematic cross-sectional view of a touch screen panel according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.

The intermediate adhesive layer of the present invention; And an outer pressure-sensitive adhesive layer laminated on both surfaces of the intermediate pressure-sensitive adhesive layer,

Wherein the outer pressure-sensitive adhesive layer comprises a half-cargo of the first acrylic resin,

Wherein the intermediate adhesive layer comprises a cured product of a second acrylic resin,

(Meth) acryloyloxy (C2 to C14 alkylene) isocyanate is reacted with the hydroxyl group by a urethane reaction with a copolymer resin of a first (meth) acrylic ester monomer and a hydroxy group-containing (meth) acrylic acid monomer, (C2-C14 alkylene) isocyanate-modified urethane acrylate copolymer resin which is formed by side chain modification and is a (meth) acryloyloxy

The second acrylic resin is an acrylic copolymer resin of a second (meth) acrylate monomer and a hydroxy (C2-C8 alkyl) (meth)

Provided is a pressure sensitive adhesive sheet for optical use having a multilayer structure.

1 is a cross-sectional view of the optical adhesive sheet of the multilayer structure. 1, the optical adhesive sheet 10 includes an intermediate adhesive layer 11 and an outer adhesive layer 12.

The optical adhesive sheet 10 of the multilayer structure includes a plurality of layers including an intermediate adhesive layer 11 having high rigidity and an outer adhesive layer 12 having high ductility so that the intermediate adhesive layer 11 is excellent It is possible to exhibit excellent step difference absorbency by the outer adhesive layer 12 at the same time while imparting durability.

The optical adhesive sheet 10 of the multilayer structure can exhibit durability and level difference absorbency at the same time without excessively increasing the thickness.

As described above, the optical pressure-sensitive adhesive sheet 10 of the multilayer structure has a multilayer structure as described above, thereby forming a stable thickness suitable for mass production, excellent durability, and excellent level difference absorbability.

The first acrylic resin is prepared by modifying a copolymer resin of a first (meth) acrylic ester monomer and a hydroxyl group-containing (meth) acrylic acid monomer with urethane reaction with (meth) acryloyloxy (C2 to C14 alkylene) isocyanate (Meth) acryloyloxy (C2 to C14 alkylene) isocyanate-modified urethane acrylate copolymer resin. (Meth) acryloyloxy (C2 to C14 alkylene) isocyanate is reacted with a hydroxyl group derived from a hydroxyl group-containing (meth) acrylic acid monomer in the copolymer resin, and the (meth) acryloyloxy A moiety derived from acryloyloxy (C2 to C14 alkylene) isocyanate is introduced into the side chain of the copolymer resin via a urethane bond. The double bonds of the moieties derived from the introduced (meth) acryloyloxy (C2 to C14 alkylene) isocyanate then act as photocurable sites in further photocuring.

As used herein, "semi-cured" means a state having an additional photo-curable site, and "semi-cured" means a cured substance having an additional photo-curable site.

The outer pressure-sensitive adhesive layer 12 is formed as a semi-cured film by thermally curing a composition for forming an outer pressure-sensitive adhesive layer containing the first acrylic resin.

The outer adhesive layer 12 may include a thermosetting agent, and the composition for forming the outer adhesive layer may be thermally cured by heat treatment to form a film in a film state.

The composition for forming the outer pressure-sensitive adhesive layer may include an isocyanate-based thermosetting agent. The urethane reaction of the isocyanate group of the isocyanate-based thermosetting agent and the hydroxyl group of the first acrylic resin can be induced and the resulting urethane functional group can induce a high adhesive force at the interface of the outer pressure-sensitive adhesive layer 12 .

The isocyanate-based thermosetting agent is preferably at least one selected from the group consisting of tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoform diisocyanate, tetramethyl xylene diisocyanate and naphthalene diisocyanate One can be included.

The composition for forming the outer pressure-sensitive adhesive layer may not include an epoxy-based thermosetting agent, a metal chelating-type thermosetting agent, and an aziridine-based thermosetting agent.

The semi-cured product of the first acrylic resin may form a cured product having a gel content of 40% by weight to 60% by weight and a gel content of 70% to 90% by photocuring.

The gel content can be measured by the following equation.

[Equation 1]

Gel content (% by weight) = W 2 / W 1 × 100

In the above formula (1), W 1 denotes an initial weight of the specimen obtained by cutting a cured product to be measured to a predetermined size and immersed in a solvent, and W 2 denotes the weight of the specimen, , Which is the weight of the test specimen obtained by drying under the condition of a constant temperature and a certain time after being filtered using a screening apparatus. As a concrete example of the measurement conditions, ethyl acetate was used as a solvent, and the sample was immersed in a solvent for 24 hours. The specimen obtained by filtering with a screening apparatus (300 mesh wire net) was dried at 110 ° C for 2 hours to measure W 2 can do.

The outer adhesive layer 12 is adhered to an object to be adhered, and then light is irradiated to the outer adhesive layer 12, which is semi-cured in a semi-cured state according to the user's application, So that further curing can be avoided. When the outer adhesive layer 12 is additionally photocured, the double bond in the first acrylic resin functions as a photoreaction site, and is photocured. The complete cured product obtained by cross-linking and fully curing the outer pressure-sensitive adhesive layer 12 by further photo-curing may have a gel content of 70% by weight to 90% by weight.

The first (meth) acrylic ester monomer is alkyl (meth) acrylate, and the alkyl of the alkyl (meth) acrylate may be linear or branched C1-C14 alkyl. By using the alkyl (meth) acrylate having the carbon number within the above range, the photo-cured product of the acrylic photo-curable resin can be adjusted to have appropriate cohesion, glass transition temperature and adhesion property.

More specifically, the (meth) acrylic acid ester monomer may be at least one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) (meth) acrylate, 2-ethylbutyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl (Meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, and combinations of two or more thereof.

The hydroxy group-containing (meth) acrylic acid monomer may be, for example, (2-hydroxyethyl (meth) acrylate, 2- hydroxypropyl (Meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyleneglycol (meth) acrylate and the like.

Wherein the first acrylic resin is obtained by mixing a first (meth) acrylic ester monomer in an amount of 70 to 99% by weight and a hydroxyl group-containing (meth) acrylic acid monomer in an amount of 1 to 30% by weight to obtain a copolymerized copolymer, (C2 to C14 alkylene) isocyanate-modified urethane acrylate copolymer resin obtained by modifying (meth) acryloyloxy (C2 to C14 alkylene) isocyanate.

The copolymer resin is copolymerized with the first (meth) acrylic ester monomer at a ratio of 70 to 99 wt% of the total monomers, and the outer pressure sensitive adhesive layer 12 obtained using the same is given an appropriate cohesive force to improve durability.

The copolymer resin is copolymerized with the hydroxy group-containing (meth) acrylic acid monomer in an amount of 1 to 30% by weight of the total monomers, and the outer pressure-sensitive adhesive layer 12 obtained using the copolymer resin has excellent step difference absorbency. In addition, the hydroxy group-containing (meth) acrylic acid monomer can induce adhesion enhancement at the interface of the outer pressure-sensitive adhesive layer 12. However, when the copolymer resin is polymerized with the hydroxy group-containing (meth) acrylic acid monomer in a content exceeding the above content range, that is, in a high content exceeding 30% by weight, the cohesive force of the outer pressure- That is, the step absorption ability may be lowered.

The copolymer resin can be produced by polymerizing by a known polymerization method, and can be produced, for example, by solution polymerization and can be produced by carrying out polymerization at a polymerization temperature of about 50 to 140 ° C.

As the copolymer resin, a thermal initiator may be used in polymerization, and examples thereof include azo-based polymerization initiators such as azobisisobutyronitrile and azobiscyclohexanecarbonitrile; And / or peroxides such as benzoyl peroxide or acetyl peroxide, and a mixture of one kind or more of the above can be used.

As described above, the copolymer resin is modified by reacting with (meth) acryloyloxy (C2 to C14 alkylene) isocyanate.

In one embodiment, the (meth) acryloyloxy (C2 to C14 alkylene) isocyanate may be 2-methacryloyloxyethylene isocyanate (MOI).

The first acrylic resin preferably has a molar ratio of 0.5 to 2 moles of (meth) acryloyloxy (C2 to C14 alkylene) isocyanate per mole of hydroxyl groups in the copolymer resin of the first (meth) acrylic ester monomer and the hydroxy group- And then reacted. By introducing the (meth) acryloyloxy (C2 to C14 alkylene) isocyanate by the above-mentioned urethane reaction, it is possible to improve adhesion at the interface of the outer adhesive layer 12 with excellent step difference absorbency.

The composition for forming the outer pressure-sensitive adhesive layer may further comprise known additional components used in the adhesive composition by mixing the first acrylic resin and the solvent to form a solvent type. Specifically, the pressure-sensitive adhesive resin, An additive comprising at least one selected from the group consisting of a photoinitiator, a UV stabilizer, an antioxidant, a colorant, a reinforcing agent, a defoamer, a surfactant, a plasticizer, a foaming agent, an organic salt and a combination thereof. By using the above-mentioned thermosetting agent, it is possible to form a film on a film during semi-curing. As described above, the thermosetting agent may be an isocyanate-based thermosetting agent. The composition for forming the outer pressure-sensitive adhesive layer may not include an epoxy-based thermosetting agent, a metal chelating-type thermosetting agent, and an aziridine-based thermosetting agent.

In order to manufacture the outer pressure-sensitive adhesive layer 12, a composition for forming the outer pressure-sensitive adhesive layer may be first prepared, and then the pressure-sensitive adhesive layer may be formed. The method for forming the film is not particularly limited, and for example, a casting method can be applied. Specifically, the pressure-sensitive adhesive composition is coated on a releasing film or release paper by a usual means such as a bar coat, a knife coat, a roll coat, a spray coat, a gravure coat, a curtain coat, a comma coat and / or a lip coat, The film can be formed into a film by forming a semi-cured thermosetting material while volatilizing the solvent.

The outer pressure sensitive adhesive layer 12 may be attached to an object to be adhered, and then the outer pressure sensitive adhesive layer 12 may be irradiated with light, have.

The method of photo-curing the semi-cured film is not particularly limited. For example, the semi-cured film may be subjected to a process of irradiating the semi-cured film with ultraviolet rays and further aging the film in a predetermined condition.

The UV irradiation carried out for photocuring can be carried out for about 10 seconds to about 15 seconds with a metal halide lamp, which is a commonly used metal halide lamp.

The amount of the UV-irradiated light is preferably about 0.5 J / cm 2 to about 5.0 J / cm 2 , and more preferably about 2.0 J / cm 2 to about 3.0 J / cm 2 .

The thickness of the outer pressure-sensitive adhesive layer 12 may be about 10 탆 to about 100 탆, and preferably about 25 탆 to 50 탆. The thickness of the outer pressure-sensitive adhesive layer 12 is in the above-mentioned range to realize excellent level difference absorbency and to form a multi-layer structure together with the intermediate pressure-sensitive adhesive layer 11, thereby achieving excellent step absorption performance and excellent durability.

The second (meth) acrylate monomer may be, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) (Meth) acrylate, t-butyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl , n-octyl (meth) acrylate, isooctyl (meth) acrylate, isobonyl (meth) acrylate, isononyl (meth) acrylate and combinations thereof.

In one embodiment, the second (meth) acrylic acid ester-based monomer may comprise (C1-C14 alkyl) (meth) acrylate and (C3-C15 cycloalkyl) (meth) acrylate.

 The (C3-C15 cycloalkyl) (meth) acrylate may be an alicyclic condensed ring-containing acrylate. Specifically, the alicyclic (meth) acrylate monomer may be cyclopentyl (meth) acrylate, cyclohexyl ) Acrylate, isobonyl (meth) acrylate, and combinations thereof.

The second acrylic resin may be a resin which is mixed and copolymerized in an amount of 100 parts by weight of the second (meth) acrylate monomer and 10 to 60 parts by weight of the hydroxy (C2 to C8 alkyl) (meth) acrylate.

The second acrylic resin is copolymerized with the above-mentioned hydroxy (C2-C8 alkyl) (meth) acrylate in the above amounts, and the intermediate adhesive layer 11 obtained by using the second acrylic resin improves the whitening and peeling force by the hydroxyl group do.

The intermediate layer (11) includes a cured product obtained by photo-curing the second acrylic resin. The intermediate layer 11 may comprise a full cured gel having a gel content of from 70% to 90% by weight and harder to further cure.

The composition for forming an intermediate pressure-sensitive adhesive layer may further include a photoinitiator to control polymerization degree upon photo-curing. The photoinitiator may be used in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the second acrylic resin. The type of photoinitiator is not particularly limited as long as it can initiate a polymerization reaction by light irradiation to initiate a polymerization reaction For example, a benzoin-based initiator, a hydroxyketone-based initiator, an amino ketone-based initiator caprolactam, and combinations thereof.

The composition for forming an intermediate pressure-sensitive adhesive layer may further contain an epoxy resin, a crosslinking agent, a UV stabilizer, an antioxidant, a colorant, a reinforcing agent, a filler, a defoamer, a surfactant, a plasticizer and a combination thereof insofar as the effects of the invention are not affected. Lt; RTI ID = 0.0 > additive < / RTI >

The intermediate adhesive layer (11) The composition for forming an intermediate adhesive layer containing the second acrylic acid resin may be prepared in a solventless type, applied on a predetermined substrate, and then photo-cured by light irradiation. Accordingly, the intermediate pressure-sensitive adhesive layer may contain a photo-cured product of the solvent-free intermediate adhesive layer-forming composition containing the second acrylic resin. The term "light irradiation" means irradiation of an electromagnetic wave that can cause polymerization reaction by affecting a photoinitiator or a polymerizable compound. In the above, electromagnetic waves include microwave, infrared ray, ultraviolet ray, X- A particle beam such as a proton beam, a neutron beam, and an electron beam is generally used.

The method of photocuring the composition for forming an intermediate pressure-sensitive adhesive layer to produce the intermediate pressure-sensitive adhesive layer is not particularly limited. For example, the intermediate adhesive layer 11 can be prepared by coating the coating solution of the composition for forming an intermediate pressure-sensitive adhesive layer on a suitable process substrate by a known means such as a bar coater and photo-curing the same.

When the adhesive sheet for optical use 10 of the multi-layer structure is removed from the object to which the optical adhesive sheet 10 having the above-mentioned multi-layer structure of interest is attached, the intermediate adhesive layer 11 is completely cured, And it is possible to remove bubbles from the surface of the outer adhesive layer 12 by acting as a support in the intermediate adhesive layer 11 when bubbles are generated.

The thickness of the intermediate adhesive layer 11 may be from about 50 탆 to about 200 탆, and preferably from 80 탆 to 125 탆. The thickness of the intermediate adhesive layer (11) is in the above-mentioned range, and a multi-layered structure is formed together with the outer adhesive layer (12) with excellent durability to realize excellent step difference absorbency.

The multi-layered optical adhesive sheet 10 can have a multi-layered structure as described above, thereby increasing the rheological property tan DELTA value and thereby improving the step absorbability.

In one embodiment, the intermediate adhesive layer 11 has a rheological property tan? Value of 0.1 to 0.5, specifically 0.2 to 0.4 at 25 占 폚, and the rheological property tan? Value of the outer adhesive layer 12 at 25 占 폚 is 0.3 To 25% of the entirety of the multi-layered optical adhesive sheet 10 laminated with the intermediate adhesive layer 11 and the outer adhesive layer 12, Value can be 0.3 to 0.7.

In the case where the transparent adhesive layer 10 and the cover window layer are attached to each other or a plurality of transparent electrode layers are included in manufacturing a touch screen panel of a display device such as a mobile device, a tablet PC, etc., It can be used as a bonding medium for bonding.

The optical pressure-sensitive adhesive sheet 10 of the multi-layer structure has durability and level difference absorbency suitable for use in glass, plastic film, or touch screen panel requiring bonding between glass and plastic film.

In another embodiment of the present invention, there is provided a method of producing the optical adhesive sheet of the multi-layer structure.

The method for producing the pressure-sensitive adhesive sheet for optical multi-layer structure comprises:

A composition for forming an outer pressure-sensitive adhesive layer of a solvent type including a first acrylic resin is prepared, a composition for forming the outer pressure-sensitive adhesive layer is coated on a predetermined substrate, and heat treatment is performed to form a semi-cured film, ;

Applying a non-solvent type intermediate adhesive layer composition containing a second acrylic resin to another predetermined substrate and then photo-curing the intermediate adhesive layer to produce an intermediate adhesive layer; And

And laminating the outer pressure-sensitive adhesive layers on both sides of the intermediate pressure-sensitive adhesive layer to produce a pressure-sensitive adhesive sheet having a multi-layer structure.

The first acrylic resin is a (meth) acryloyloxy (C2 to C14 alkylene) isocyanate-modified urethane acrylate copolymer resin which is copolymerized with a copolymer resin of a first (meth) acrylic ester monomer and a hydroxyl group-containing (meth) acrylic acid monomer (Meth) acryloyloxy (C2-C14 alkylene) isocyanate is introduced into the side chain by the urethane reaction with the hydroxy group to modify the same.

The second acrylic resin is an acrylic copolymer resin of a second (meth) acrylate monomer and a hydroxy (C2-C8 alkyl) (meth) acrylate.

By the above-described method for producing an optical pressure-sensitive adhesive sheet having a multi-layer structure, the pressure-sensitive adhesive sheet for an optical multi-layer structure described above in detail can be produced. Therefore, the first acrylic resin, the second acrylic resin, the obtained intermediate adhesive layer and the outer adhesive layer are as described above.

The composition for forming the outer adhesive layer does not contain a thermal curing agent and the solvent is removed during the heat treatment of the composition for forming the outer adhesive layer so that the first acrylic resin is thermally cured by physical entanglement, The double bonds in the first acrylic resin can be photo-crosslinked by a cross-linking reaction by a photoreaction.

The heat treatment may be performed at 70 to 120 ° C.

The gel content of the outer adhesive layer of the semi-cured film may be 40 wt% to 60 wt%, and the gel content of the intermediate adhesive layer may be 70 wt% to 90 wt%.

The method for producing an optical adhesive sheet of the multi-layer structure comprises attaching the outer adhesive layer to an object to be attached, and then photo-curing the semi-cured film so that the gel content is 70% to 90% And then curing.

In another embodiment of the present invention, a transparent electrode layer having a conductive layer formed on at least one surface thereof; A cover window layer; And the optical adhesive sheet adhering between the transparent electrode layer and the cover windowing layer or between the transparent electrode layer and the optical adhesive sheet.

The adhesive sheet for optical use used in the touch screen panel includes an intermediate adhesive layer and an outer adhesive layer laminated on both surfaces of the intermediate adhesive layer as described above. Wherein the first acrylic resin forming the semi-cured body contained in the outer adhesive layer comprises a resin obtained by copolymerizing a hydroxy group-containing (meth) acrylic acid monomer without using an acid type acrylic resin, on type direct bonding as well as the touch sensitivity can be realized even when applied to an oncell structure. When the touch screen panel is applied to an oncell structure, the electrodes are exposed to the liquid crystal module. When the adhesive sheet is an acid type, the carboxyl group is oxidized and reacted with water to form electrode materials of metal oxide such as ITO (indium tin oxide) As the oxide is corroded, the resistance rises. This may result in touch sensitivity or touch failure. Since the outer adhesive layer of the optical pressure sensitive adhesive sheet of the touch screen panel does not cause an oxidation reaction even if it is exposed to moisture by using an acrylic acid resin of a non-acid type, the electrode material of a metal oxide such as ITO (indium tin oxide) So that it is possible to realize excellent touch sensitivity even when applied to an on-cell structure.

The transparent electrode layer may be a conductive plastic film formed on one side of the conductive metal oxide or a glass having the conductive layer formed thereon.

The cover window layer may be a transparent glass alternative plastic film developed as a material that can replace tempered glass or tempered glass. In the case of the above glass replacement plastic film, various functionalities may be imparted to each layer by a multilayer structure.

The pressure-sensitive adhesive sheet is excellent in durability and excellent in level absorbability, and glass, a plastic film, and the like can be variously used as the material of the cover window layer and the transparent electrode layer. The pressure-sensitive adhesive sheet is suitable for use as an adhesive layer for laminating touch-screen panels of various structures and materials.

2 is a schematic cross-sectional view of the touch screen panel 100. FIG.

2, the touch screen panel 100 includes a cover window layer 150; An optical adhesive sheet (110); A conductive plastic film layer 130 having a conductive layer 132 formed on one side of the plastic substrate layer 131; And a liquid crystal module (LCM) (160).

A detailed description of the optical adhesive sheet 110 is as described above.

A specific kind of the conductive plastic film 130 is not particularly limited, and a known conductive film in this field can be used. For example, the conductive film 130 may be a transparent plastic film having an ITO electrode layer as a conductive layer 132 on one side. Specifically, as the transparent plastic film forming the plastic substrate layer 131, a polyethylene terephthalate film, a polytetrafluoroethylene film, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a vinyl chloride air An ethylene-vinyl acetate film, an ethylene-propylene copolymer film, an ethylene-ethyl acrylate copolymer film, an ethylene-methyl acrylate copolymer film, or a polyimide film. More specifically, the plastic substrate layer 131 may be a polyethylene terephthalate (PET) film.

Hereinafter, examples and comparative examples of the present invention will be described. The following embodiments are only examples of the present invention and the present invention is not limited to the following embodiments.

( Example )

Example  One

middle The adhesive layer  Produce

70 parts by weight of ethylhexyl acrylate, 10 parts by weight of isobornyl acrylate and 20 parts by weight of hydroxybutyl acrylate were placed in a 1 liter glass reactor and thermally polymerized to obtain a photocurable acrylic copolymer resin syrup having a viscosity of 3500 cP . 0.3 parts by weight of photoinitiator a, a-methoxy-a-hydroxyacetophenone (Igacure 651, manufactured by Ciba), 100 parts by weight of hexanediol diacrylate (HDDA) were added to 100 parts by weight (based on solid content) of the obtained photo- 0.2 part by weight were mixed to prepare a composition for forming an intermediate adhesive layer as a non-solvent type. The composition for forming an intermediate pressure-sensitive adhesive layer was coated on a substrate to a thickness of 125 mu m, and then irradiated with light to be cured to form an intermediate pressure-sensitive adhesive layer.

suburb The adhesive layer  Produce

65 parts by weight of ethylhexyl acrylate, 15 parts by weight of isobornyl acrylate, and 20 parts by weight of hydroxyethyl acrylate were placed in a 1 liter glass reactor as a pressure sensitive adhesive layer, and a copolymer resin having a viscosity of 3000 cP was obtained by a solution polymerization method. 100 parts by weight of the copolymer resin (based on solid content) and 5 parts by weight of 2-methacryloyloxyethylene isocyanate (MOI, Hitachi Chem.) Were mixed and stirred at room temperature for 24 hours to effect urethane reaction between the hydroxyl group of the polymer and NCO Side chain modification to obtain a modified urethane acrylate copolymer resin.

A composition for forming an outer pressure-sensitive adhesive layer was prepared by mixing hexamethylene diisocyanate, a photoinitiator, a solvent and other additives as the isocyanate-based thermosetting agent to the modified urethane acrylate copolymer resin. Subsequently, the composition for forming the outer pressure-sensitive adhesive layer was coated on the substrate in a predetermined amount and heat-treated at 110 ° C for 5 minutes, followed by drying and thermosetting to form a film having a thickness of 25 μm to obtain a semi-cured film.

Production of pressure-sensitive adhesive sheet of multi-layer structure

The prepared outer layer was laminated on both sides of the intermediate adhesive layer to prepare a pressure-sensitive adhesive sheet having a multi-layered structure of an outer adhesive layer, a middle adhesive layer and an outer adhesive layer.

Comparative Example  One

87.5 parts by weight of ethylhexyl acrylate, 12.5 parts by weight of isobornyl acrylate and 25 parts by weight of hydroxybutyl acrylate were placed in a 1 liter glass reactor and thermally polymerized to obtain a photocurable acrylic copolymer resin syrup having a viscosity of 3500 cP. 0.3 parts by weight of photoinitiator a, a-methoxy-a-hydroxyacetophenone (Igacure 651, manufactured by Ciba), 100 parts by weight of hexanediol diacrylate (HDDA) were added to 100 parts by weight (based on solid content) of the obtained photo- 0.2 part by weight were mixed to prepare a composition for forming a pressure-sensitive adhesive layer as a solvent-free type. The composition for forming a pressure-sensitive adhesive layer was coated on a substrate to a thickness of 175 mu m, and then irradiated with light to be fully cured to produce a pressure-sensitive adhesive sheet having a total thickness of 175 mu m.

Comparative Example  2

65 parts by weight of ethylhexyl acrylate, 15 parts by weight of isobornyl acrylate and 20 parts by weight of hydroxyethyl acrylate were placed in a 1 liter glass reactor as a peripheral adhesive layer, and a copolymer resin having a viscosity of 3000 cP was obtained by a solution polymerization method. 100 parts by weight of the copolymer resin (based on solid content) and 5 parts by weight of 2-methacryloyloxyethylene isocyanate (MOI, Hitachi Chem.) Were mixed and stirred at room temperature for 24 hours to effect urethane reaction between the hydroxyl group of the polymer and NCO Side chain modification to obtain a modified urethane acrylate copolymer resin.

A composition for forming a pressure-sensitive adhesive layer was prepared by mixing hexamethylene diisocyanate, a photoinitiator, a solvent and other additives as an isocyanate-based thermosetting agent to the modified urethane acrylate copolymer resin. Then, the composition for forming an adhesive layer was coated on a substrate in a predetermined amount and heat-treated at 110 ° C for 5 minutes, followed by drying and thermosetting to form a film having a thickness of 175 μm to obtain a semi-cured film.

evaluation

Experimental Example  One: Pus  Property evaluation

The pressure sensitive adhesive sheets prepared in Example 1 and Comparative Example 1-2 were measured for tan? At 25 占 폚 under the following equipments and measuring conditions.

Equipment: ARES G2 Rheometer.

Measurement method: Four sheets of the adhesive sheet prepared in Example 1 and Comparative Example 1-2 having a thickness of 175 mu m were laminated to prepare samples each having a thickness of 700 mu m.

Measuring condition: Strain 10%, Measuring temperature range: -20 ℃ ~ 100 ℃, Axial force: 2N, Frequency: 1 rad / sec

Experimental Example  2: Peel force  evaluation

The peel strengths of the pressure-sensitive adhesive sheets prepared in Example 1 and Comparative Example 1-2 were measured by the following equipments and measuring methods.

Equipment: Text Analyzer,

Measuring method: Using a backing film (50 μm), measure the peel strength at 180 ° C for 30 minutes after attachment, at a measuring speed of 300 mm / min.

Experimental Example  3: Step Absorption capacity  evaluation

After attaching the pressure sensitive adhesive sheets prepared in Example 1 and Comparative Example 1-2 to a window glass having a printing step of 5 inches in height, a glass having no printing step was attached to the opposite surface thereof, The level of landfill was confirmed. A window glass having a printing step at thicknesses of 5 占 퐉, 10 占 퐉, 15 占 퐉, 20 占 퐉, 25 占 퐉 and 30 占 퐉 was prepared, and from the window glass of the lower printing step, Table 1 shows the heights of the printing steps at which bubbles start to be produced by attaching the pressure sensitive adhesive sheet produced in Example 1. [

Experimental Example  4: Reliability evaluation

After attaching the adhesive sheets prepared in Example 1 and Comparative Example 1-2 to a window glass having a printing step of 5 inches in height, a polarizing film was attached to the opposite surface, After storage, the presence or absence of bubbles was visually evaluated and evaluated, and is shown in Table 1 below.

tan? [unit] Peel force (g / in) Step absorption ability
(탆) responsibility Example 1 0.60 2,300 25 No air bubbles Comparative Example 1 0.30 3,000 10 Bubbled Comparative Example 2 0.65 2,100 15 Bubbled

As can be seen from the above Table 1, the optical pressure-sensitive adhesive sheet of the multilayer structure of Example 1 shows a high step-ability of absorption and excellent reliability.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, And falls within the scope of the invention.

10: Optical adhesive sheet
11: intermediate adhesive layer
12: outer adhesive layer
100: Touch screen panel
110: Optical adhesive sheet
131: plastic substrate layer
132: conductive layer
130: Conductive plastic film
150: Cover window layer
160: LC module (LCM)

Claims (25)

An intermediate adhesive layer; And an outer pressure-sensitive adhesive layer laminated on both surfaces of the intermediate pressure-sensitive adhesive layer,
Wherein the outer pressure-sensitive adhesive layer comprises a half-cargo of the first acrylic resin,
Wherein the intermediate adhesive layer comprises a cured product of a second acrylic resin,
(Meth) acryloyloxy (C2 to C14 alkylene) isocyanate is reacted with the hydroxyl group by a urethane reaction with a copolymer resin of a first (meth) acrylic ester monomer and a hydroxy group-containing (meth) acrylic acid monomer, (C2-C14 alkylene) isocyanate-modified urethane acrylate copolymer resin which is formed by side chain modification and is a (meth) acryloyloxy
The second acrylic resin is an acrylic copolymer resin of a second (meth) acrylate monomer and a hydroxy (C2-C8 alkyl) (meth)
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
The outer pressure-sensitive adhesive layer is a thermosetting resin of the (meth) acryloyloxy (C2 to C14 alkylene) isocyanate-modified urethane acrylate copolymer resin, and is a radially-
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
The semi-cured product of the first acrylic resin may have a gel content of 40% by weight to 60% by weight, and additionally a cured product having a gel content of 70% by weight to 90%
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
Wherein the gel content of the cured product of the second acrylic resin is 70 wt% to 90 wt%
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
Wherein the first (meth) acrylic ester monomer is an alkyl (meth) acrylate and the alkyl of the alkyl (meth) acrylate is a linear or branched C1-C14 alkyl
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
The first acrylic resin is obtained by copolymerizing 70 to 99% by weight of a first (meth) acrylic ester monomer and 1 to 30% by weight of a hydroxyl group-containing (meth) acrylic acid monomer with (meth) acryloyloxy C2 to C14 alkylene) isocyanate modified
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
The first acrylic resin preferably has a molar ratio of 0.5 to 2 moles of (meth) acryloyloxy (C2 to C14 alkylene) isocyanate per mole of hydroxyl groups in the copolymer resin of the first (meth) acrylic ester monomer and the hydroxy group- Lt; / RTI >
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
Wherein the intermediate adhesive layer comprises a photo-cured product of the second acrylic resin
The method according to claim 1,
The second (meth) acrylate monomer is selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) (meth) acrylate, 2-ethylbutyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl (Meth) acrylate, isooctyl (meth) acrylate, isobonyl (meth) acrylate, isononyl (meth) acrylate and combinations thereof.
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
The second acrylic resin is prepared by mixing 100 parts by weight of the second (meth) acrylic ester monomer and 10 to 60 parts by weight of the hydroxy (C2 to C8 alkyl) (meth) acrylate,
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
The second (meth) acrylic acid ester-based monomer includes (C1-C14 alkyl) (meth) acrylate and (C3-C15 cycloalkyl) (meth)
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
Wherein the outer pressure sensitive adhesive layer comprises a thermosetting composition for forming the outer pressure sensitive adhesive layer of a solvent type including the first acrylic resin and is formed as a semi - cured film, the composition for forming the outer pressure sensitive adhesive layer comprises an isocyanate heat curable agent, An epoxy-based thermosetting agent, a metal chelating-type thermosetting agent, and an aziridine-based thermosetting agent,
Wherein the intermediate pressure-sensitive adhesive layer comprises a photo-curable composition of a solventless intermediate adhesive layer composition comprising the second acrylic resin,
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
The thickness of the intermediate pressure-sensitive adhesive layer is in the range of 50 탆 to 200 탆
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
The thickness of the outer pressure-sensitive adhesive layer is in the range of 10 탆 to 100 탆
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
Wherein the intermediate pressure-sensitive adhesive layer has a rheological property tan? Value at 25 占 폚 of 0.1 to 0.5
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
Wherein the outer pressure-sensitive adhesive layer has a rheological property tan? Value at 25 占 폚 of 0.3 to 0.8
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
The method according to claim 1,
Wherein the optical pressure-sensitive adhesive sheet has a rheological property tan? Value at 25 占 폚 of 0.3 to 0.7
A pressure sensitive adhesive sheet for optical use having a multilayer structure.
A composition for forming an outer pressure-sensitive adhesive layer of a solvent type including a first acrylic resin is prepared, a composition for forming the outer pressure-sensitive adhesive layer is coated on a predetermined substrate, and heat treatment is performed to form a semi-cured film, ;
Applying a non-solvent type intermediate adhesive layer composition containing a second acrylic resin to another predetermined substrate and then photo-curing the intermediate adhesive layer to produce an intermediate adhesive layer; And
Forming a pressure-sensitive adhesive sheet for optical use having a multi-layer structure by laminating the outer pressure-sensitive adhesive layer on both sides of the intermediate pressure-sensitive adhesive layer,
The first acrylic resin is a (meth) acryloyloxy (C2 to C14 alkylene) isocyanate-modified urethane acrylate copolymer resin which is copolymerized with a copolymer resin of a first (meth) acrylic ester monomer and a hydroxyl group-containing (meth) acrylic acid monomer (Meth) acryloyloxy (C2-C14 alkylene) isocyanate is introduced into the side chain by the urethane reaction with the hydroxy group,
The second acrylic resin is an acrylic copolymer resin of a second (meth) acrylate monomer and a hydroxy (C2-C8 alkyl) (meth)
A method for producing an adhesive sheet for optical use of a multilayer structure.
19. The method of claim 18,
Wherein the composition for forming the outer pressure-sensitive adhesive layer comprises an isocyanate-based thermosetting agent, the composition for forming the outer pressure-sensitive adhesive layer is thermally cured by heat treatment, and the double bond in the first acrylic- Which can be photocured by reaction
A method for producing an adhesive sheet for optical use of a multilayer structure.
19. The method of claim 18,
The heat treatment is carried out at 70 to < RTI ID = 0.0 > 120 C &
A method for producing an adhesive sheet for optical use of a multilayer structure.
19. The method of claim 18,
The gel content of the outer adhesive layer of the semi-cured film is 40 wt% to 60 wt%, and the gel content of the intermediate adhesive layer is 70 wt% to 90 wt%
A method for producing an adhesive sheet for optical use of a multilayer structure.
19. The method of claim 18,
Attaching the outer adhesive layer to an object to be attached, and further curing the semi-cured film to further cure the gel so that the gel content is 70 to 90% by weight
A method for producing an adhesive sheet for optical use of a multilayer structure.
A transparent electrode layer having a conductive layer formed on at least one surface thereof;
A cover window layer; And
The optical adhesive sheet of any one of claims 1 to 17, wherein the adhesive sheet for optical use has a multilayer structure according to any one of claims 1 to 17, which is attached between the transparent electrode layer and the cover woofier layer or between the transparent electrode layers.
And a touch screen panel.
24. The method of claim 23,
The transparent electrode layer may be formed of a conductive plastic film formed on one side of the conductive metal oxide or a glass
Touch screen panel.
24. The method of claim 23,
The cover window may be a transparent glass replacement plastic film or tempered glass
Touch screen panel.
KR1020160059088A 2016-05-13 2016-05-13 Multi layered optical adhesive sheet, method preparing multi layered optical adhesive sheet and touch screen panel KR102044248B1 (en)

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