KR102142271B1 - Adhesive layer for optical film, adhesive film for optical film - Google Patents

Adhesive layer for optical film, adhesive film for optical film Download PDF

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KR102142271B1
KR102142271B1 KR1020200028844A KR20200028844A KR102142271B1 KR 102142271 B1 KR102142271 B1 KR 102142271B1 KR 1020200028844 A KR1020200028844 A KR 1020200028844A KR 20200028844 A KR20200028844 A KR 20200028844A KR 102142271 B1 KR102142271 B1 KR 102142271B1
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meth
film
adhesive layer
optical film
weight
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KR20200027943A (en
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타케시 나가쿠라
료 하세가와
히로유키 요시다
아키요 히시누마
후미에 스즈키
켄타로 오츠가
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후지모리 고교 가부시키가이샤
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    • 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
    • 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
    • C09J133/068—Copolymers with monomers not covered by C09J133/06 containing glycidyl 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • 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
    • 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
    • C09J133/12—Homopolymers or copolymers of methyl methacrylate
    • 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
    • C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • 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
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/255—Polyesters
    • 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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • 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
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • C09J2201/622—
    • 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
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Electroluminescent Light Sources (AREA)
  • Laminated Bodies (AREA)

Abstract

본 발명은 화상 표시 장치에 장착되는 광학 필름의 첩합에 사용되는 우수한 내열성 및 내구성을 갖는 광학 필름용 점착제층, 광학 필름용 점착 필름, 및 이들을 제작하기 위한 광학 필름용 점착제 조성물을 제공한다. 알킬(메타)아크릴레이트 모노머, 방향족기를 갖는 (메타)아크릴레이트 모노머, 질소 함유 비닐 모노머로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부와, 카르복실기 함유 공중합성 비닐 모노머 0.1∼10.0중량부와, 수산기 함유 공중합성 비닐 모노머 0.05∼4.5중량부를 공중합시킨, Tg가 －60℃ 이상 －30℃ 이하인 공중합체로 이루어지는 아크릴계 폴리머를 가교시켜 이루어지는 광학 필름용 점착제층을 제공한다.The present invention provides an adhesive layer for an optical film, an adhesive film for an optical film, and an adhesive composition for an optical film for producing them, having excellent heat resistance and durability used for bonding optical films mounted on an image display device. A total of 100 parts by weight of at least two or more monomers selected from the group consisting of alkyl (meth)acrylate monomers, (meth)acrylate monomers having aromatic groups, and nitrogen-containing vinyl monomers, and 0.1 to 10.0 weight of carboxyl group-containing copolymerizable vinyl monomers Provided is a pressure-sensitive adhesive layer for an optical film formed by cross-linking an acrylic polymer composed of a copolymer having a Tg of -60°C to -30°C, in which 0.05 to 4.5 parts by weight of a hydroxyl group-containing copolymerizable vinyl monomer is copolymerized.

Description

광학 필름용 점착제층, 광학 필름용 점착 필름{ADHESIVE LAYER FOR OPTICAL FILM, ADHESIVE FILM FOR OPTICAL FILM}Adhesive layer for optical films, adhesive film for optical films {ADHESIVE LAYER FOR OPTICAL FILM, ADHESIVE FILM FOR OPTICAL FILM}

본 발명은 광학 필름용 점착제층, 광학 필름용 점착 필름, 및 이들을 제작하기 위한 광학 필름용 점착제 조성물에 관한 것이다. 보다 상세하게는, 화상 표시 장치에 장착되는 광학 필름의 첩합에 사용되는 우수한 내열성 및 내구성을 갖는 광학 필름용 점착제층, 광학 필름용 점착 필름, 및 이들을 제작하기 위한 광학 필름용 점착제 조성물을 제공하는 것에 관한 것이다.The present invention relates to an adhesive layer for an optical film, an adhesive film for an optical film, and an adhesive composition for an optical film for producing them. More specifically, to provide a pressure-sensitive adhesive layer for an optical film, a pressure-sensitive adhesive film for optical films, and an optical film pressure-sensitive adhesive composition for manufacturing them, which have excellent heat resistance and durability used for bonding optical films mounted to an image display device It is about.

근래에는, 각종 화상 표시 장치에 있어서 각종 광학 필름이 사용되고 있다. 예를 들면, 콘트라스트의 향상, 외광의 반사 방지 등을 목적으로 하여, 편광 필름, 위상차 필름 등의 광학 필름이 사용되고 있다. 이들 광학 필름을 액정 패널이나 유기 EL(일렉트로루미네선스) 패널 등의 피착체에 첩합하기 위해, 각종 점착 필름이 제안되어 있다(예를 들면, 특허문헌 1 참조). 또한, 유기 EL 패널의 배면의 반사층과 편광 필름 사이에, 편광 필름의 편광축에 대한 각도가 －45°인 1/4λ 위상차 필름 1장을 배치하거나, －15°인 1/2λ 위상차 필름 1장과 －75°인 1/4λ 위상차 필름 1장을 배치함으로써, 외광의 반사를 억제할 수 있다는 것이 알려져 있다.In recent years, various optical films have been used in various image display devices. For example, for the purpose of improving contrast, preventing reflection of external light, and the like, optical films such as polarizing films and retardation films are used. In order to bond these optical films to adherends such as liquid crystal panels and organic EL (electroluminescence) panels, various adhesive films have been proposed (for example, see Patent Document 1). Further, between the reflective layer on the back of the organic EL panel and the polarizing film, one sheet of 1/4λ retardation film having an angle to the polarization axis of the polarizing film is −45°, or one sheet of 1/2λ retardation film having −15° It is known that reflection of external light can be suppressed by arranging one sheet of 1/4λ retardation film of −75°.

일본 공개특허공보 2012-201734호Japanese Patent Application Publication 2012-201734

상기와 같이, 유기 EL 패널의 외광으로부터의 반사 방지를 위해, 편광 필름과 유기 EL 패널 사이에 역파장 분산(복굴절이 장파장일수록 증대)이 1/4λ인 위상차 필름이 형성되어 있다. 또한, 종래 기술에서는 1/4λ인 위상차 필름으로서 재질이 폴리카보네이트계 필름인 위상차 필름이 널리 사용되고 있다. 그러나, 폴리카보네이트계 필름을 사용한 경우, 폴리카보네이트로부터의 아웃 가스에 의한 발포를 억제할 수 없다고 하는 문제가 있었다.As described above, in order to prevent reflection of the organic EL panel from external light, a retardation film having a reverse wavelength dispersion (increasing as birefringence increases with a longer wavelength) is formed between the polarizing film and the organic EL panel. In addition, in the prior art, a retardation film having a material of polycarbonate-based film is widely used as a retardation film having 1/4λ. However, when a polycarbonate-based film was used, there was a problem that foaming by outgas from the polycarbonate could not be suppressed.

본 발명은 상기 사정을 감안하여 이루어진 것으로, 화상 표시 장치에 장착되는 광학 필름의 첩합에 사용되는 우수한 내열성 및 내구성을 갖는 광학 필름용 점착제층, 광학 필름용 점착 필름, 및 이들을 제작하기 위한 광학 필름용 점착제 조성물을 제공하는 것을 과제로 한다.The present invention has been made in view of the above circumstances, an adhesive layer for an optical film having excellent heat resistance and durability used for bonding an optical film mounted on an image display device, an adhesive film for an optical film, and an optical film for producing them It is an object to provide an adhesive composition.

상기 과제를 해결하기 위해, 본 발명은 알킬기의 탄소수가 C1∼C14인 알킬(메타)아크릴레이트 모노머, 방향족기를 갖는 (메타)아크릴레이트 모노머, 질소 함유 비닐 모노머로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부와, 카르복실기 함유 공중합성 비닐 모노머 0.1∼10.0중량부와, 수산기 함유 공중합성 비닐 모노머 0.05∼4.5중량부를 공중합시킨, Tg가 －60℃ 이상 －30℃ 이하인 공중합체로 이루어지는 아크릴계 폴리머를 가교시킨 점착제층으로 함으로써, 우수한 내열성과 내구성을 갖는 점착제층을 얻는 것을 기술 사상으로 하고 있다.In order to solve the above problems, the present invention is at least two or more selected from the group of monomers consisting of alkyl (meth)acrylate monomers having C1 to C14 alkyl groups, (meth)acrylate monomers having aromatic groups, and nitrogen-containing vinyl monomers. A total of 100 parts by weight of the monomer, 0.1 to 10.0 parts by weight of a carboxyl-containing copolymerizable vinyl monomer, and 0.05 to 4.5 parts by weight of a hydroxyl group-containing copolymerizable vinyl monomer, which are acrylics composed of a copolymer having a Tg of -60°C to -30°C or less The technical idea is to obtain a pressure-sensitive adhesive layer having excellent heat resistance and durability by forming a pressure-sensitive adhesive layer in which a polymer is crosslinked.

상기 과제를 해결하기 위해, 본 발명은 아크릴계 폴리머와 가교성 화합물을 포함하는 광학 필름용 점착제 조성물로서, 상기 아크릴계 폴리머가 (A) 알킬기의 탄소수가 C1∼C14인 알킬(메타)아크릴레이트 모노머(a1), 방향족기를 갖는 (메타)아크릴레이트 모노머(a2), 질소 함유 비닐 모노머(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부(단, 상기 (a1)에 속하는 모노머의 1종을 51중량부 이상 95중량부 이하와, 상기 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 다른 1종 이상의 모노머의 합계를 5중량부 이상 49중량부 이하의 합계가 100중량부가 된다)와, (B) 카르복실기 함유 공중합성 비닐 모노머 0.1∼10.0중량부와, (C) 수산기 함유 공중합성 비닐 모노머 0.05∼4.5중량부를 공중합시킨, Tg가 －60℃ 이상 －30℃ 이하인 공중합체로 이루어지는 것을 특징으로 하는 광학 필름용 점착제 조성물을 제공한다.In order to solve the above problems, the present invention is an adhesive composition for an optical film comprising an acrylic polymer and a crosslinkable compound, wherein the acrylic polymer is (A) an alkyl group having C1 to C14 alkyl (meth)acrylate monomers (a1) ), a total of 100 parts by weight of at least two or more monomers selected from the group consisting of (meth)acrylate monomers having an aromatic group (a2) and a nitrogen-containing vinyl monomer (a3) (however, 1 of the monomers belonging to (a1) above) A total of 5 parts by weight or more and 49 parts by weight or less is a total of 51 parts by weight or more and 95 parts by weight or less, and 5 parts by weight or more and 49 parts by weight or less of a total of other one or more monomers selected from the monomer group consisting of (a1) to (a3)) Wow, (B) 0.1 to 10.0 parts by weight of a carboxyl group-containing copolymerizable vinyl monomer, and (C) hydroxyl group-containing copolymerizable vinyl monomers comprising 0.05 to 4.5 parts by weight of a copolymer having a Tg of -60°C to -30°C or less. It provides a pressure-sensitive adhesive composition for an optical film.

상기 가교성 화합물이 2관능 이상의 에폭시계 화합물이고, 상기 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부에 대해, 상기 가교성 화합물을 0.001∼0.5중량부 함유하는 것이 바람직하다.The crosslinkable compound is a bifunctional or higher epoxy compound, and the crosslinkable compound is 0.001 to 0.5 parts by weight based on 100 parts by weight of a total of at least two or more monomers selected from the monomer group consisting of (a1) to (a3). It is preferable to contain.

상기 아크릴계 폴리머에 공중합시킨 상기 (B) 카르복실기 함유 공중합성 비닐 모노머가 (메타)아크릴산, 카르복시에틸(메타)아크릴레이트, 카르복시펜틸(메타)아크릴레이트, 2-(메타)아크릴로일옥시에틸헥사히드로프탈산, 2-(메타)아크릴로일옥시에틸프탈산, 2-(메타)아크릴로일옥시에틸숙신산, 2-(메타)아크릴로일옥시에틸말레산, 카르복시폴리카프로락톤모노(메타)아크릴레이트, 2-(메타)아크릴로일옥시에틸테트라히드로프탈산으로 이루어지는 화합물군 중에서 선택된 적어도 1종 이상이고, 상기 아크릴계 폴리머에 공중합시킨 상기 (C) 수산기 함유 공중합성 비닐 모노머가 8-히드록시옥틸(메타)아크릴레이트, 6-히드록시헥실(메타)아크릴레이트, 4-히드록시부틸(메타)아크릴레이트, 2-히드록시프로필(메타)아크릴레이트, 2-히드록시에틸(메타)아크릴레이트, N-히드록시(메타)아크릴아미드, N-히드록시메틸(메타)아크릴아미드, N-히드록시에틸(메타)아크릴아미드로 이루어지는 화합물군 중에서 선택된 적어도 1종 이상인 것이 바람직하다.The (B) carboxyl group-containing copolymerizable vinyl monomer copolymerized with the acrylic polymer is (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, 2-(meth)acryloyloxyethyl hexahydro Phthalic acid, 2-(meth)acryloyloxyethylphthalic acid, 2-(meth)acryloyloxyethylsuccinic acid, 2-(meth)acryloyloxyethylmaleic acid, carboxypolycaprolactone mono(meth)acrylate, At least one selected from the group consisting of 2-(meth)acryloyloxyethyltetrahydrophthalic acid, and the (C) hydroxyl-containing copolymerizable vinyl monomer copolymerized with the acrylic polymer is 8-hydroxyoctyl (meth). Acrylate, 6-hydroxyhexyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, N-hydride It is preferable that it is at least 1 sort(s) or more selected from the compound group which consists of hydroxy (meth)acrylamide, N-hydroxymethyl (meth)acrylamide, and N-hydroxyethyl (meth)acrylamide.

상기 아크릴계 폴리머에 공중합시킨 상기 (a2) 방향족기를 갖는 (메타)아크릴레이트 모노머가 벤질(메타)아크릴레이트, 나프틸(메타)아크릴레이트, 페녹시에틸(메타)아크릴레이트, 페녹시부틸(메타)아크릴레이트, 페녹시디에틸렌글리콜(메타)아크릴레이트, 2-(1-나프틸옥시)에틸(메타)아크릴레이트, 6-(1-나프틸옥시)헥실(메타)아크릴레이트, 6-(2-나프틸옥시)헥실(메타)아크릴레이트, 8-(1-나프틸옥시)옥틸(메타)아크릴레이트, 8-(2-나프틸옥시)옥틸(메타)아크릴레이트로 이루어지는 화합물군 중에서 선택된 적어도 1종 이상인 것이 바람직하다.The (meth)acrylate monomer having the (a2) aromatic group copolymerized with the acrylic polymer is benzyl (meth)acrylate, naphthyl (meth)acrylate, phenoxyethyl (meth)acrylate, phenoxybutyl (meth) Acrylate, phenoxydiethylene glycol (meth)acrylate, 2-(1-naphthyloxy)ethyl (meth)acrylate, 6-(1-naphthyloxy)hexyl (meth)acrylate, 6-(2- At least 1 selected from the group consisting of naphthyloxy)hexyl(meth)acrylate, 8-(1-naphthyloxy)octyl(meth)acrylate, and 8-(2-naphthyloxy)octyl(meth)acrylate It is preferable that it is more than a species.

또한, 본 발명은 상기 광학 필름용 점착제 조성물을 가교하여 이루어지는 광학 필름용 점착제층의 겔분율이 60∼90％이고, 상기 광학 필름용 점착제층의 두께가 5∼25㎛인 것을 특징으로 하는 광학 필름용 점착제층을 제공한다.In addition, the present invention is an optical film characterized in that the gel fraction of the pressure-sensitive adhesive layer for optical films formed by crosslinking the pressure-sensitive adhesive composition for optical films is 60 to 90%, and the thickness of the pressure-sensitive adhesive layer for optical films is 5 to 25 μm. A pressure-sensitive adhesive layer is provided.

또한, 본 발명은 폴리카보네이트 수지 필름으로 이루어지는 위상차 필름의 양면에 상기 광학 필름용 점착제 조성물을 가교하여 이루어지는 광학 필름용 점착제층이 전사되며, 또한 그 한쪽 면에 편광 필름이 첩합되어 이루어지는 점착제층이 형성된 광학 필름의 적층체를, 무알칼리 유리에 첩합시키고 나서 85℃ dry 분위기하에서 200시간 보관한 후, 23℃×50％ RH 분위기하에 꺼내고 나서 1시간 후에 확인하여 발포하지 않는 내구성을 갖는 것을 특징으로 하는 광학 필름용 점착제층을 제공한다.In addition, in the present invention, the pressure-sensitive adhesive layer for an optical film formed by crosslinking the pressure-sensitive adhesive composition for an optical film is transferred to both sides of a retardation film made of a polycarbonate resin film, and an adhesive layer formed by bonding a polarizing film to one side is formed. The laminated body of the optical film is stored in a dry atmosphere at 85°C for 200 hours after bonding to an alkali-free glass, and then taken out under a 23°C x 50% RH atmosphere, and after 1 hour, it is characterized by having durability that does not foam. An adhesive layer for an optical film is provided.

또한, 본 발명은 상기 광학 필름용 점착제 조성물이 이형 필름의 한쪽 면에 도포되고 광학 필름용 점착제층이 형성되어 이루어지며, 이형 필름/광학 필름용 점착제층/이형 필름의 구성인 것을 특징으로 하는 광학 필름용 점착 필름을 제공한다.In addition, the present invention is made of a pressure-sensitive adhesive composition for an optical film is applied to one side of a release film, the pressure-sensitive adhesive layer for an optical film is formed, the optical film characterized in that the configuration of the release film / optical film pressure-sensitive adhesive layer / release film Provided is an adhesive film for a film.

또한, 본 발명은 기재의 한쪽 면 위에 상기 광학 필름용 점착제 조성물을 가교하여 이루어지는 광학 필름용 점착제층이 적층된 것을 특징으로 하는 광학 필름용 점착 필름을 제공한다.In addition, the present invention provides a pressure-sensitive adhesive film for an optical film, characterized in that a pressure-sensitive adhesive layer for optical films formed by crosslinking the pressure-sensitive adhesive composition for an optical film on one side of a substrate.

또한, 본 발명은 상기 광학 필름용 점착제 조성물을 가교하여 이루어지는 광학 필름용 점착제층이 광학 필름의 첩합에 사용된 화상 표시 장치를 제공한다.In addition, the present invention provides an image display device in which the pressure-sensitive adhesive layer for optical films formed by crosslinking the pressure-sensitive adhesive composition for optical films is used for bonding of optical films.

또한, 본 발명은 상기 광학 필름용 점착제 조성물을 가교하여 이루어지는 광학 필름용 점착제층이 사용된 점착제층이 형성된 편광판을 제공한다.In addition, the present invention provides a polarizing plate on which the pressure-sensitive adhesive layer for an optical film formed by crosslinking the pressure-sensitive adhesive composition for an optical film is used.

또한, 본 발명은 상기 광학 필름용 점착제 조성물을 가교하여 이루어지는 광학 필름용 점착제층이 사용되고, 구성 재료로서 1/4λ의 위상차를 갖는 위상차 필름이 사용된 점착제층이 형성된 편광판을 제공한다.In addition, the present invention provides a polarizing plate in which the pressure-sensitive adhesive layer for an optical film formed by crosslinking the pressure-sensitive adhesive composition for an optical film is used, and the pressure-sensitive adhesive layer having a phase difference film having a phase difference of 1/4λ is used as a constituent material.

또한, 본 발명은 광학 필름의 적어도 일방의 면에, 상기 광학 필름용 점착제 조성물을 가교하여 이루어지는 광학 필름용 점착제층이 적층되어 있는 점착제층이 형성된 광학 필름을 제공한다.In addition, the present invention provides an optical film on which at least one side of an optical film is provided with a pressure-sensitive adhesive layer in which a pressure-sensitive adhesive layer for optical films is formed by crosslinking the pressure-sensitive adhesive composition for optical films.

본 발명에 의하면, 알킬(메타)아크릴레이트 모노머, 방향족기를 갖는 (메타)아크릴레이트 모노머, 질소 함유 비닐 모노머로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부와, 카르복실기 함유 공중합성 비닐 모노머 0.1∼10.0중량부와, 수산기 함유 공중합성 비닐 모노머 0.05∼4.5중량부를 공중합시킨, Tg가 －60℃ 이상 －30℃ 이하인 공중합체로 이루어지는 아크릴계 폴리머를 가교시켜 이루어지는 점착제층으로 함으로써, 우수한 내열성 및 내구성을 갖는 광학 필름용 점착제층, 광학 필름용 점착 필름, 및 이들에 사용되는 광학 필름용 점착제 조성물을 제공할 수 있다.According to the present invention, a total of 100 parts by weight of at least two or more monomers selected from the group consisting of alkyl (meth)acrylate monomers, (meth)acrylate monomers having aromatic groups, and nitrogen-containing vinyl monomers, and carboxyl group-containing copolymerizable vinyl By making the pressure-sensitive adhesive layer made by crosslinking an acrylic polymer composed of a copolymer having a Tg of -60°C to -30°C or less by copolymerizing 0.1 to 10.0 parts by weight of monomer and 0.05 to 4.5 parts by weight of hydroxyl-containing copolymerizable vinyl monomer, excellent heat resistance and It is possible to provide an adhesive layer for an optical film having durability, an adhesive film for an optical film, and an adhesive composition for an optical film used therein.

또한, 폴리카보네이트 수지 필름으로 이루어지는 위상차 필름의 양면에 본 발명에 따른 광학 필름용 점착제층을 전사하고, 또한 그 한쪽 면에 편광 필름을 첩합하여 이루어지는 점착제층이 형성된 광학 필름의 적층체를, 무알칼리 유리에 첩합시키고 나서 85℃ dry 분위기하에서 200시간 보관한 후, 23℃×50％ RH 분위기하에 꺼내고 나서 1시간 후에 확인하여 발포하지 않는 내구성을 갖는다. 이 때문에, 본 발명에 따른 광학 필름용 점착제층은 폴리카보네이트 수지 필름으로 이루어지는 위상차 필름의 첩합에 극히 우수한 기능을 발휘할 수 있다.Moreover, the laminated body of the optical film in which the pressure-sensitive adhesive layer for optical films which concerns on this invention is transferred to both surfaces of the retardation film which consists of polycarbonate resin film, and the polarizing film is stuck on one side, and the laminated body of the optical film in which the pressure-sensitive adhesive layer was formed is alkali-free After bonding to glass, it is stored in a dry atmosphere at 85°C for 200 hours, and then taken out under a 23°C x 50% RH atmosphere, and confirmed after 1 hour to have a non-foaming durability. For this reason, the pressure-sensitive adhesive layer for an optical film according to the present invention can exhibit an extremely excellent function for bonding a retardation film made of a polycarbonate resin film.

이하, 바람직한 실시형태에 기초하여 본 발명을 설명한다.Hereinafter, the present invention will be described based on preferred embodiments.

본 발명의 광학 필름용 점착제 조성물은 아크릴계 폴리머와 가교성 화합물을 포함한다. 이 광학 필름용 점착제 조성물을 가교하여, 본 발명의 광학 필름용 점착제층이 형성된다. 본 발명의 광학 필름용 점착제 조성물은 (A) 알킬기의 탄소수가 C1∼C14인 알킬(메타)아크릴레이트 모노머(a1), 방향족기를 갖는 (메타)아크릴레이트 모노머(a2), 질소 함유 비닐 모노머(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부(단, 상기 (a1)에 속하는 모노머의 1종을 51중량부 이상 95중량부 이하와, 상기 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 다른 1종 이상의 모노머의 합계를 5중량부 이상 49중량부 이하의 합계가 100중량부가 된다)와, (B) 카르복실기 함유 공중합성 비닐 모노머 0.1∼10.0중량부와, (C) 수산기 함유 공중합성 비닐 모노머 0.05∼4.5중량부를 공중합시킨, Tg가 －60℃ 이상 －30℃ 이하인 공중합체로 이루어지는 아크릴계 폴리머와 가교성 화합물을 함유하고 있다.The pressure-sensitive adhesive composition for an optical film of the present invention contains an acrylic polymer and a crosslinkable compound. The pressure-sensitive adhesive composition for optical films is crosslinked to form the pressure-sensitive adhesive layer for optical films of the present invention. The adhesive composition for an optical film of the present invention includes (A) an alkyl (meth)acrylate monomer (a1) having an alkyl group having C1 to C14, an (meth)acrylate monomer having an aromatic group (a2), and a nitrogen-containing vinyl monomer (a3). ) 100 parts by weight of at least two or more monomers selected from the group consisting of monomers (however, one type of monomers belonging to (a1) above is 51 parts by weight or more and 95 parts by weight or less, and (a1) to (a3) above A total of 5 parts by weight or more and 49 parts by weight or less is 100 parts by weight of the total of one or more other monomers selected from the group consisting of monomers), (B) 0.1 to 10.0 parts by weight of a copolymerizable vinyl monomer containing a carboxyl group, and (C) It contains an acrylic polymer and a crosslinkable compound composed of a copolymer having a Tg of -60°C to -30°C or less, copolymerized with 0.05 to 4.5 parts by weight of a hydroxyl group-containing copolymerizable vinyl monomer.

또한, 본 발명의 광학 필름용 점착제층은 폴리카보네이트 수지 필름으로 이루어지는 위상차 필름의 양면에 광학 필름용 점착제층이 전사되며, 또한 그 한쪽 면에 편광 필름이 첩합되어 이루어지는 점착제층이 형성된 광학 필름의 적층체를, 무알칼리 유리에 첩합시키고 나서 85℃ dry 분위기하에서 200시간 보관한 후, 23℃×50％ RH 분위기하에 꺼내고 나서 1시간 후에 확인하여 발포하지 않는 내구성을 갖는다.In addition, in the pressure-sensitive adhesive layer for an optical film of the present invention, a pressure-sensitive adhesive layer for an optical film is transferred to both sides of a retardation film made of a polycarbonate resin film, and a laminated optical film having an adhesive layer formed by bonding a polarizing film to one side thereof The sieve is stored in a dry atmosphere at 85°C for 200 hours after being bonded to an alkali-free glass, and then taken out under an atmosphere of 23°C x 50% RH to confirm after 1 hour, and has a durability not to foam.

본 발명의 광학 필름용 점착제 조성물에 따른 아크릴계 폴리머는 (A)군에 속하는 모노머(주성분 모노머)에 속해 있는 화합물군 중에서 선택한 2종 이상과, (B)군 및 (C)군에 속하는 모노머(관능기 모노머)에 속해 있는 화합물군에서 선택한 각각 1종 이상을 공중합하여 얻어진 공중합체이다. (A)군에 속하는 모노머로서, 알킬기의 탄소수가 C1∼C14인 알킬(메타)아크릴레이트 모노머(a1), 방향족기를 갖는 (메타)아크릴레이트 모노머(a2), 질소 함유 비닐 모노머(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상을 사용할 수 있다. 또한, (B)군에 속하는 모노머로서, 카르복실기 함유 공중합성 비닐 모노머의 적어도 1종 이상과, (C)군에 속하는 모노머로서, 수산기 함유 공중합성 비닐 모노머의 적어도 1종 이상을 사용할 수 있다. 본 명세서 중, (메타)아크릴레이트는 아크릴레이트 및 메타크릴레이트의 총칭이다.The acrylic polymer according to the pressure-sensitive adhesive composition for an optical film of the present invention comprises two or more selected from the group of compounds belonging to the monomer (main component monomer) belonging to the group (A), and a monomer (functional group) belonging to the group (B) and (C). It is a copolymer obtained by copolymerizing 1 or more types each selected from the compound group which belongs to a monomer). As a monomer belonging to the group (A), the alkyl group comprises C1 to C14 alkyl (meth)acrylate monomer (a1), an aromatic group-containing (meth)acrylate monomer (a2), and a nitrogen-containing vinyl monomer (a3). At least two or more selected from the monomer group may be used. Moreover, as a monomer belonging to the group (B), at least one or more of the carboxyl group-containing copolymerizable vinyl monomers, and as the monomer belonging to the group (C), at least one of the hydroxyl group-containing copolymerizable vinyl monomers can be used. In the present specification, (meth)acrylate is a generic term for acrylate and methacrylate.

본 발명의 광학 필름용 점착제층에 따른 점착제 조성물에 있어서, (A)군에 속하는 (a1) 알킬기의 탄소수가 C1∼C14인 알킬(메타)아크릴레이트 모노머로는, 메틸(메타)아크릴레이트, 에틸(메타)아크릴레이트, 프로필(메타)아크릴레이트, 이소프로필(메타)아크릴레이트, 부틸(메타)아크릴레이트, 이소부틸(메타)아크릴레이트, t-부틸(메타)아크릴레이트, 펜틸(메타)아크릴레이트, 이소펜틸(메타)아크릴레이트, 헥실(메타)아크릴레이트, 이소헥실(메타)아크릴레이트, 헵틸(메타)아크릴레이트, 이소헵틸(메타)아크릴레이트, 옥틸(메타)아크릴레이트, 이소옥틸(메타)아크릴레이트, 2-에틸헥실(메타)아크릴레이트, 노닐(메타)아크릴레이트, 이소노닐(메타)아크릴레이트, 데실(메타)아크릴레이트, 이소데실(메타)아크릴레이트, 운데실(메타)아크릴레이트, 이소운데실(메타)아크릴레이트, 도데실(메타)아크릴레이트, 이소도데실(메타)아크릴레이트, 트리데실(메타)아크릴레이트, 이소트리데실(메타)아크릴레이트, 테트라데실(메타)아크릴레이트, 이소테트라데실(메타)아크릴레이트로 이루어지는 화합물군에서 선택된 적어도 1종 이상을 들 수 있다. 알킬(메타)아크릴레이트 모노머의 알킬기는 직쇄여도 되고, 분기형이어도 되며, 고리형(지환족)이어도 된다.In the pressure-sensitive adhesive composition according to the pressure-sensitive adhesive layer for an optical film of the present invention, as the alkyl (meth)acrylate monomer having C1 to C14 carbon atoms in the (a1) alkyl group belonging to the group (A), methyl (meth)acrylate and ethyl (Meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylic Late, isopentyl (meth)acrylate, hexyl (meth)acrylate, isohexyl (meth)acrylate, heptyl (meth)acrylate, isoheptyl (meth)acrylate, octyl (meth)acrylate, isooctyl ( Meta)acrylate, 2-ethylhexyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth) Acrylate, isoundecyl (meth)acrylate, dodecyl (meth)acrylate, isododecyl (meth)acrylate, tridecyl (meth)acrylate, isotridecyl (meth)acrylate, tetradecyl (meth) ) Acrylate, isotetradecyl (meth) acrylate, and at least one selected from the group of compounds. The alkyl group of the alkyl (meth)acrylate monomer may be straight chain, branched, or cyclic (alicyclic).

본 발명의 광학 필름용 점착제 조성물에 따른 아크릴계 폴리머는, (A)군에 속하는 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부 중, (a1) 알킬기의 탄소수가 C1∼C14인 알킬(메타)아크릴레이트 모노머로 이루어지는 화합물군 중에서 선택된 모노머의 1종을 51중량부 이상 95중량부 이하의 비율로 함유하는 것이 바람직하다.The acrylic polymer according to the pressure-sensitive adhesive composition for an optical film of the present invention comprises (a1) an alkyl group in a total of 100 parts by weight of at least two or more monomers selected from the monomer group consisting of (a1) to (a3) belonging to the group (A). It is preferable to contain at least 51 parts by weight or more and 95 parts by weight or less of one monomer selected from the group of compounds consisting of C1 to C14 alkyl (meth)acrylate monomers.

또한, (a1) 알킬기의 탄소수가 C1∼C14인 알킬(메타)아크릴레이트 모노머는 화학공업계에서 대량으로 사용되는 극히 일반적인 화합물이라는 점에서 입수하기 쉽고, 비교적 가격이 저렴한 재료이며, 제품인 점착제 조성물의 제조 비용을 억제하기 위해 효과적으로 사용할 수 있는 화합물이다.Further, (a1) alkyl (meth)acrylate monomers having C1 to C14 carbon atoms in the alkyl group are very common compounds that are readily available in that they are used in large quantities in the chemical industry, and are relatively inexpensive materials. It is a compound that can be effectively used to keep costs down.

또한, (a1) 알킬기의 탄소수가 C1∼C14인 알킬(메타)아크릴레이트 모노머는 폴리머의 유리 전이 온도(Tg)가 －30℃ 이하인 화합물이 많이 포함되어 있기 때문에, 본 발명에 따른 광학 필름용 점착제층의 물성을 조정하는 방법으로서 선택하기 쉽다는 점에서 이용 가치가 높은 화합물이다.In addition, the alkyl (meth)acrylate monomer having C1 to C14 carbon atoms in the (a1) alkyl group contains many compounds having a polymer glass transition temperature (Tg) of -30°C or lower. It is a highly useful compound in that it is easy to select as a method of adjusting the physical properties of the layer.

본 발명의 광학 필름용 점착제층에 따른 점착제 조성물에 있어서, (A)군에 속하는 (a2) 방향족기를 갖는 (메타)아크릴레이트 모노머로는, 벤질(메타)아크릴레이트, 나프틸(메타)아크릴레이트, 페녹시에틸(메타)아크릴레이트, 페녹시부틸(메타)아크릴레이트, 페녹시디에틸렌글리콜(메타)아크릴레이트, 2-(1-나프틸옥시)에틸(메타)아크릴레이트, 2-(2-나프틸옥시)에틸(메타)아크릴레이트, 6-(1-나프틸옥시)헥실(메타)아크릴레이트, 6-(2-나프틸옥시)헥실(메타)아크릴레이트, 8-(1-나프틸옥시)옥틸(메타)아크릴레이트, 8-(2-나프틸옥시)옥틸(메타)아크릴레이트로 이루어지는 화합물군에서 선택된 적어도 1종 이상을 들 수 있다. 굴절률이 높은 광학 필름용 점착제층을 얻기 위해서는 아크릴계 폴리머에 방향족기를 갖는 (메타)아크릴레이트 모노머의 적어도 1종 이상을 공중합시키는 것이 바람직하다.In the pressure-sensitive adhesive composition according to the pressure-sensitive adhesive layer for an optical film of the present invention, examples of the (meth)acrylate monomer having an (a2) aromatic group belonging to the group (A) include benzyl (meth)acrylate and naphthyl (meth)acrylate , Phenoxyethyl (meth)acrylate, phenoxybutyl (meth)acrylate, phenoxydiethylene glycol (meth)acrylate, 2-(1-naphthyloxy)ethyl (meth)acrylate, 2-(2- Naphthyloxy)ethyl (meth)acrylate, 6-(1-naphthyloxy)hexyl (meth)acrylate, 6-(2-naphthyloxy)hexyl (meth)acrylate, 8-(1-naphthyl And at least one compound selected from the group consisting of oxy) octyl (meth) acrylate and 8-(2-naphthyloxy) octyl (meth) acrylate. In order to obtain a pressure-sensitive adhesive layer for an optical film having a high refractive index, it is preferable to copolymerize at least one or more of (meth)acrylate monomers having an aromatic group in an acrylic polymer.

본 발명의 광학 필름용 점착제 조성물에 따른 아크릴계 폴리머는, (A)군에 속하는 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부 중, (a2) 방향족기를 갖는 (메타)아크릴레이트 모노머를 0∼30중량부의 비율로 함유할 수 있다.The acrylic polymer according to the pressure-sensitive adhesive composition for an optical film of the present invention includes (a2) an aromatic group in 100 parts by weight of a total of at least two or more monomers selected from the monomer group consisting of (a1) to (a3) belonging to the group (A) The (meth)acrylate monomer to be contained can be contained in a proportion of 0 to 30 parts by weight.

또한, 본 발명에 따른 아크릴계 폴리머가 (a2) 방향족기를 갖는 (메타)아크릴레이트 모노머를 함유하는 경우에는, (A)군에 속하는 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부 중, 3∼25중량부의 비율로 함유하는 것이 보다 바람직하고, 8∼20중량부의 비율로 함유하는 것이 특히 바람직하다.Further, when the acrylic polymer according to the present invention contains a (meth)acrylate monomer having an (a2) aromatic group, at least two or more selected from the monomer group consisting of (a1) to (a3) belonging to the group (A) It is more preferable to contain in a proportion of 3 to 25 parts by weight, and particularly preferably in a proportion of 8 to 20 parts by weight, out of 100 parts by weight of the total monomer.

본 발명의 광학 필름용 점착제층에 따른 점착제 조성물에 있어서, (A)군에 속하는 (a3) 질소 함유 비닐 모노머로는, 아미드 결합을 함유하는 (메타)아크릴계 모노머, 아미노기를 함유하는 (메타)아크릴계 모노머 등을 들 수 있다. 보다 구체적으로는, N-(메타)아크릴로일모르폴린, N-(메타)아크릴로일피페라진, N-(메타)아크릴로일아지리딘, N-(메타)아크릴로일아제티딘, N-(메타)아크릴로일피롤리딘, N-(메타)아크릴로일피페리딘, N-(메타)아크릴로일아제판, N-(메타)아크릴로일아조칸 등의, N-(메타)아크릴로일 치환의 복소 고리형 구조를 갖는 고리형 질소 비닐 화합물; (메타)아크릴아미드, N-메틸(메타)아크릴아미드, N-이소프로필(메타)아크릴아미드, N-t-부틸(메타)아크릴아미드 등의 무치환 또는 모노알킬 치환의 (메타)아크릴아미드; N,N-디메틸(메타)아크릴아미드, N,N-디에틸(메타)아크릴아미드, N,N-디프로필아크릴아미드, N,N-디이소프로필(메타)아크릴아미드, N,N-디부틸(메타)아크릴아미드, N-에틸-N-메틸(메타)아크릴아미드, N-메틸-N-프로필(메타)아크릴아미드, N-메틸-N-이소프로필(메타)아크릴아미드 등의 디알킬 치환 (메타)아크릴아미드; N,N-디메틸아미노메틸(메타)아크릴레이트, N,N-디메틸아미노에틸(메타)아크릴레이트, N,N-디메틸아미노프로필(메타)아크릴레이트, N,N-디메틸아미노이소프로필(메타)아크릴레이트, N,N-디메틸아미노부틸(메타)아크릴레이트, N,N-디에틸아미노메틸(메타)아크릴레이트, N,N-디에틸아미노에틸(메타)아크릴레이트, N-에틸-N-메틸아미노에틸(메타)아크릴레이트, N-메틸-N-프로필아미노에틸(메타)아크릴레이트, N-메틸-N-이소프로필아미노에틸(메타)아크릴레이트, N,N-디부틸아미노에틸(메타)아크릴레이트, t-부틸아미노에틸(메타)아크릴레이트 등의 디알킬아미노(메타)아크릴레이트; N,N-디메틸아미노프로필(메타)아크릴아미드, N,N-디에틸아미노프로필(메타)아크릴아미드, N,N-디프로필아미노프로필(메타)아크릴아미드, N,N-디이소프로필아미노프로필(메타)아크릴아미드, N-에틸-N-메틸아미노프로필(메타)아크릴아미드, N-메틸-N-프로필아미노프로필(메타)아크릴아미드, N-메틸-N-이소프로필아미노프로필(메타)아크릴아미드 등의 N,N-디알킬 치환 아미노프로필(메타)아크릴아미드; (메타)아크릴로니트릴로 이루어지는 화합물군에서 선택된 적어도 1종 이상을 들 수 있다. (a3) 질소 함유 비닐 모노머로는 수산기를 함유하지 않는 것이 바람직하고, 수산기 및 카르복실기를 함유하지 않는 것이 보다 바람직하다.In the pressure-sensitive adhesive composition according to the pressure-sensitive adhesive layer for an optical film of the present invention, (a3) nitrogen-containing vinyl monomers belonging to the group (A) include (meth)acrylic monomers containing amide bonds and (meth)acrylic systems containing amino groups And monomers. More specifically, N-(meth)acryloylmorpholine, N-(meth)acryloylpiperazine, N-(meth)acryloylaziridine, N-(meth)acryloylazetidine, N -(Meth)acryloylpyrrolidine, N-(meth)acryloylpiperidine, N-(meth)acryloyl azepane, N-(meth)acryloyl azocan, N-(meth) Cyclic nitrogen vinyl compounds having a heterocyclic structure of acryloyl substitution; Unsubstituted or monoalkyl substituted (meth)acrylamides such as (meth)acrylamide, N-methyl(meth)acrylamide, N-isopropyl(meth)acrylamide, and N-t-butyl(meth)acrylamide; N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N,N-dipropylacrylamide, N,N-diisopropyl(meth)acrylamide, N,N-di Dialkyls such as butyl (meth)acrylamide, N-ethyl-N-methyl (meth)acrylamide, N-methyl-N-propyl (meth)acrylamide, and N-methyl-N-isopropyl (meth)acrylamide Substituted (meth)acrylamide; N,N-dimethylaminomethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl (meth)acrylate, N,N-dimethylaminoisopropyl (meth) Acrylate, N,N-dimethylaminobutyl (meth)acrylate, N,N-diethylaminomethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, N-ethyl-N- Methylaminoethyl (meth)acrylate, N-methyl-N-propylaminoethyl (meth)acrylate, N-methyl-N-isopropylaminoethyl (meth)acrylate, N,N-dibutylaminoethyl (meth )Acrylates, dialkylamino (meth)acrylates, such as t-butylaminoethyl (meth)acrylate; N,N-dimethylaminopropyl (meth)acrylamide, N,N-diethylaminopropyl (meth)acrylamide, N,N-dipropylaminopropyl (meth)acrylamide, N,N-diisopropylaminopropyl (Meth)acrylamide, N-ethyl-N-methylaminopropyl (meth)acrylamide, N-methyl-N-propylaminopropyl (meth)acrylamide, N-methyl-N-isopropylaminopropyl (meth)acrylic N,N-dialkyl substituted aminopropyl (meth)acrylamide such as amide; And at least one or more compounds selected from the group consisting of (meth)acrylonitrile. (a3) It is preferable that it does not contain a hydroxyl group as a nitrogen-containing vinyl monomer, and it is more preferable that it does not contain a hydroxyl group and a carboxyl group.

본 발명의 광학 필름용 점착제 조성물에 따른 아크릴계 폴리머는, (A)군에 속하는 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부 중, (a3) 질소 함유 비닐 모노머를 0∼20중량부의 비율로 함유할 수 있다.The acrylic polymer according to the pressure-sensitive adhesive composition for an optical film of the present invention contains (a3) nitrogen in 100 parts by weight of a total of at least two or more monomers selected from the monomer group consisting of (a1) to (a3) belonging to the group (A) The vinyl monomer may be contained in a proportion of 0 to 20 parts by weight.

또한, 본 발명에 따른 아크릴계 폴리머가 (a3) 질소 함유 비닐 모노머를 함유하는 경우는, (A)군에 속하는 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부 중, 2∼20중량부의 비율로 함유하는 것이 보다 바람직하고, 2∼12중량부의 비율로 함유하는 것이 특히 바람직하다.In addition, when the acrylic polymer according to the present invention contains (a3) a nitrogen-containing vinyl monomer, a total of 100 weights of at least two or more monomers selected from the monomer group consisting of (a1) to (a3) belonging to the group (A) Among the parts, it is more preferably contained in a proportion of 2 to 20 parts by weight, particularly preferably 2 to 12 parts by weight.

(B)군 및 (C)군에 속하는 모노머(관능기 모노머)는 가교성 화합물과 반응하는 것이 가능한 관능기를 갖는다. 이러한 관능기로는 카르복실기, 수산기 등이 있다. 여기서, (A)군에 속하는 모노머는 가교성 화합물과 반응하는 것이 가능한 관능기를 갖지 않아도 된다.The monomers (functional group monomers) belonging to the group (B) and the group (C) have a functional group capable of reacting with a crosslinkable compound. Examples of the functional group include a carboxyl group and a hydroxyl group. Here, the monomer belonging to the group (A) does not need to have a functional group capable of reacting with a crosslinkable compound.

본 발명의 광학 필름용 점착제층에 따른 점착제 조성물에 있어서, (B) 카르복실기 함유 공중합성 비닐 모노머로는, (메타)아크릴산, 카르복시에틸(메타)아크릴레이트, 카르복시펜틸(메타)아크릴레이트, 2-(메타)아크릴로일옥시에틸헥사히드로프탈산, 2-(메타)아크릴로일옥시에틸프탈산, 2-(메타)아크릴로일옥시에틸숙신산, 2-(메타)아크릴로일옥시에틸말레산, 카르복시폴리카프로락톤모노(메타)아크릴레이트, 2-(메타)아크릴로일옥시에틸테트라히드로프탈산으로 이루어지는 화합물군 중에서 선택된 적어도 1종 이상을 들 수 있다.In the pressure-sensitive adhesive composition according to the pressure-sensitive adhesive layer for an optical film of the present invention, (B) carboxyl group-containing copolymerizable vinyl monomers include (meth)acrylic acid, carboxyethyl (meth)acrylate, and carboxypentyl (meth)acrylate, 2- (Meth)acryloyloxyethylhexahydrophthalic acid, 2-(meth)acryloyloxyethylphthalic acid, 2-(meth)acryloyloxyethylsuccinic acid, 2-(meth)acryloyloxyethylmaleic acid, carboxy And at least one compound selected from the group consisting of polycaprolactone mono(meth)acrylate and 2-(meth)acryloyloxyethyltetrahydrophthalic acid.

본 발명에 따른 아크릴계 폴리머는, (A)군에 속하는 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부에 대해, (B) 카르복실기 함유 공중합성 비닐 모노머를 0.1∼10.0중량부 함유하는 것이 바람직하고, 0.3∼9.0중량부 함유하는 것이 보다 바람직하며, 0.5∼9.0중량부 함유하는 것이 특히 바람직하다.The acrylic polymer according to the present invention comprises (B) a carboxyl group-containing copolymerizable vinyl monomer with respect to 100 parts by weight of a total of at least two or more monomers selected from the monomer group consisting of (a1) to (a3) belonging to the group (A). It is preferable to contain 0.1 to 10.0 parts by weight, more preferably 0.3 to 9.0 parts by weight, and particularly preferably 0.5 to 9.0 parts by weight.

본 발명의 광학 필름용 점착제층에 따른 점착제 조성물에 있어서, (C) 수산기 함유 공중합성 비닐 모노머로는, 8-히드록시옥틸(메타)아크릴레이트, 6-히드록시헥실(메타)아크릴레이트, 4-히드록시부틸(메타)아크릴레이트, 2-히드록시프로필(메타)아크릴레이트, 2-히드록시에틸(메타)아크릴레이트 등의 수산기 함유 알킬(메타)아크릴레이트류나, N-히드록시(메타)아크릴아미드, N-히드록시메틸(메타)아크릴아미드, N-히드록시에틸(메타)아크릴아미드 등의 수산기 함유 (메타)아크릴아미드류 등의 적어도 1종 이상을 들 수 있다. 그 중에서, 수산기 함유 공중합성 비닐 모노머가 8-히드록시옥틸(메타)아크릴레이트, 6-히드록시헥실(메타)아크릴레이트, 4-히드록시부틸(메타)아크릴레이트, 2-히드록시프로필(메타)아크릴레이트, 2-히드록시에틸(메타)아크릴레이트, N-히드록시(메타)아크릴아미드, N-히드록시메틸(메타)아크릴아미드, N-히드록시에틸(메타)아크릴아미드로 이루어지는 화합물군 중에서 선택된 적어도 1종 이상인 것이 바람직하다.In the pressure-sensitive adhesive composition according to the pressure-sensitive adhesive layer for an optical film of the present invention, (C) a hydroxyl group-containing copolymerizable vinyl monomer, 8-hydroxyoctyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 4 -Hydroxy group-containing alkyl (meth)acrylates such as hydroxybutyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 2-hydroxyethyl (meth)acrylate, and N-hydroxy (meth) And at least one or more of hydroxyl group-containing (meth)acrylamides such as acrylamide, N-hydroxymethyl (meth)acrylamide, and N-hydroxyethyl (meth)acrylamide. Among them, hydroxyl-containing copolymerizable vinyl monomers include 8-hydroxyoctyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 2-hydroxypropyl (metha) ) A group of compounds consisting of acrylate, 2-hydroxyethyl (meth)acrylate, N-hydroxy (meth)acrylamide, N-hydroxymethyl (meth)acrylamide, and N-hydroxyethyl (meth)acrylamide It is preferable that it is at least one selected from among.

본 발명의 광학 필름용 점착제층에 따른 아크릴계 폴리머는, (A)군에 속하는 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부에 대해, (C) 수산기 함유 공중합성 비닐 모노머를 0.05∼4.5중량부 함유하는 것이 바람직하고, 0.05∼1.2중량부 함유하는 것이 보다 바람직하며, 0.05∼0.5중량부 함유하는 것이 특히 바람직하다.The acrylic polymer according to the pressure-sensitive adhesive layer for an optical film of the present invention is (C) hydroxyl group with respect to 100 parts by weight of a total of at least two or more monomers selected from the monomer group consisting of (a1) to (a3) belonging to the group (A). It is preferable to contain 0.05 to 4.5 parts by weight of the containing copolymerizable vinyl monomer, more preferably 0.05 to 1.2 parts by weight, and particularly preferably 0.05 to 0.5 parts by weight.

상기 아크릴계 폴리머로서 사용되는 공중합체의 중합 방법은 특별히 한정되지 않으며, 용액 중합법, 유화 중합법 등 적절히 공지의 중합 방법이 사용 가능하다. 상기 아크릴계 폴리머의 모노머 조성에서는, (A)군에 속하는 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부 중, (a1) 알킬기의 탄소수가 C1∼C14인 알킬(메타)아크릴레이트 모노머에 속하는 모노머의 1종을 51중량부 이상 95중량부 이하(M1로 약칭한다)로 하고, 상기 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 다른 1종 이상의 모노머의 합계를 5중량부 이상 49중량부 이하(M2로 약칭한다)로 하며, M1과 M2의 합계를 100중량부로 하고 있다. M1은 모노머의 1종만으로 이루어지고, M2는 M1 이외의 모노머로 이루어진다. M2를 구성하는 각 모노머가 (a1)∼(a3) 중 어느 것에 속하는 한, M2가 (a1)에 속하는 모노머(M1에 해당하는 모노머를 제외한다)를 포함해도 되고 포함하지 않아도 되며, M2가 (a2)에 속하는 모노머를 포함해도 되고 포함하지 않아도 되며, M2가 (a3)에 속하는 모노머를 포함해도 되고 포함하지 않아도 된다.The polymerization method of the copolymer used as the acrylic polymer is not particularly limited, and a well-known polymerization method such as a solution polymerization method or an emulsion polymerization method can be used. In the monomer composition of the acrylic polymer, the (a1) alkyl group has C1 to C14 in 100 parts by weight of a total of at least two or more monomers selected from the monomer group consisting of (a1) to (a3) belonging to the group (A). One of the monomers belonging to the alkyl (meth)acrylate monomer is 51 parts by weight or more and 95 parts by weight or less (abbreviated as M1), and one or more other monomers selected from the monomer group consisting of (a1) to (a3). The total of 5 parts by weight or more and 49 parts by weight or less (abbreviated as M2) is set to 100 parts by weight of M1 and M2. M1 consists of only one type of monomer, and M2 consists of monomers other than M1. As long as each monomer constituting M2 belongs to any of (a1) to (a3), M2 may or may not include a monomer belonging to (a1) (excluding monomers corresponding to M1), and M2 is ( A monomer belonging to a2) may or may not be included, and M2 may or may not contain a monomer belonging to (a3).

본 발명에서는 아크릴계 폴리머의 유리 전이 온도(이하, Tg로 기재한다)는 －60℃ 이상 －30℃ 이하가 바람직하다. Tg가 －30℃를 초과하면, 내발포성(내구성)이 저하되기 때문에 바람직하지 않다. 나아가, 본 발명에 따른 아크릴계 폴리머의 Tg는 －50℃∼－30℃인 것이 보다 바람직하다. 또한, 본 발명에 따른 아크릴계 폴리머의 중량 평균 분자량은 100만 이상이 바람직하고, 100만∼200만의 범위인 것이 보다 바람직하다.In the present invention, the glass transition temperature (hereinafter referred to as Tg) of the acrylic polymer is preferably -60°C or higher and -30°C or lower. When Tg exceeds -30°C, foam resistance (durability) decreases, which is not preferable. Furthermore, the Tg of the acrylic polymer according to the present invention is more preferably -50°C to -30°C. Further, the weight average molecular weight of the acrylic polymer according to the present invention is preferably 1 million or more, and more preferably 1 to 2 million.

본 발명의 광학 필름용 점착제층에 따른 점착제 조성물은 상기 아크릴계 폴리머에 가교성 화합물이나 적절히 임의의 첨가제를 배합함으로써, 필요로 되는 물성값을 조정할 수 있다.The pressure-sensitive adhesive composition according to the pressure-sensitive adhesive layer for an optical film of the present invention can adjust a required physical property value by blending the acrylic polymer with a crosslinkable compound or any optional additive.

본 발명의 광학 필름용 점착제 조성물에 따른 가교성 화합물은 아크릴계 폴리머의 가교에 사용되는 화합물(가교제)이다. 가교성 화합물로는, 2관능 이상의 에폭시계 화합물이 바람직하다. 2관능 이상의 에폭시계 화합물로는, 1분자에 에폭시기를 2개 이상 갖는 화합물이면 특별히 한정되지 않지만, 예를 들면, 1,3-비스(디글리시딜아미노메틸)시클로헥산, 1,3-비스(디글리시딜아미노메틸)벤젠[별명: N,N,N´,N´-테트라글리시딜-m-자일릴렌디아민], 디글리시딜아닐린 등의 폴리글리시딜아민류, 소르비톨폴리글리시딜에테르, (폴리)에틸렌글리콜디글리시딜에테르, 1,6-헥산디올디글리시딜에테르, 글리세린폴리글리시딜에테르, 트리메틸올프로판폴리글리시딜에테르, 비스페놀 A 디글리시딜에테르 등의 폴리글리시딜에테르류, 헥사히드로프탈산디글리시딜에스테르, 말레산디글리시딜에스테르 등의 폴리글리시딜에스테르류 등에서 선택되는 적어도 1종 이상을 들 수 있다.The crosslinkable compound according to the pressure-sensitive adhesive composition for an optical film of the present invention is a compound (crosslinking agent) used for crosslinking an acrylic polymer. As a crosslinkable compound, a bifunctional or higher epoxy compound is preferable. The bifunctional or more epoxy-based compound is not particularly limited as long as it is a compound having two or more epoxy groups in one molecule. For example, 1,3-bis(diglycidylaminomethyl)cyclohexane, 1,3-bis (Diglycidylaminomethyl)benzene [nickname: N,N,N´,N´-tetraglycidyl-m-xylylenediamine], polyglycidylamines such as diglycidyl aniline, sorbitol polyglycol Cydyl ether, (poly)ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerin polyglycidyl ether, trimethylolpropane polyglycidyl ether, bisphenol A diglycidyl ether And polyglycidyl esters such as polyglycidyl ethers such as diglycidyl esters of hexahydrophthalate and diglycidyl maleate.

또한, 일반적으로 입수 가능한 시판되고 있는 에폭시계 화합물로는, 예를 들면, 1,3-비스(디글리시딜아미노메틸)시클로헥산, 1,3-비스(디글리시딜아미노메틸)벤젠 등을 들 수 있다.Moreover, as a commercially available epoxy compound which is generally available, for example, 1,3-bis(diglycidylaminomethyl)cyclohexane, 1,3-bis(diglycidylaminomethyl)benzene, etc. Can be heard.

또한, 본 발명의 광학 필름용 점착제 조성물은, (A)군에 속하는 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부에 대해, 가교성 화합물을 0.001∼0.5중량부 함유하는 것이 바람직하다. 가교성 화합물로서 2관능 이상의 에폭시계 화합물만을 사용해도 된다.Further, the pressure-sensitive adhesive composition for an optical film of the present invention contains 0.001 to a crosslinkable compound in 100 parts by weight of a total of at least two or more monomers selected from the monomer group consisting of (a1) to (a3) belonging to the group (A). It is preferable to contain 0.5 part by weight. As the crosslinkable compound, only a bifunctional or higher epoxy compound may be used.

그 밖의 임의의 성분으로서, 산화 방지제, 대전 방지제, 실란 커플링제, 계면활성제, 경화 촉진제, 가소제, 충전제, 가교 촉매, 가교 지연제, 경화 지연제, 가공 보조제, 노화 방지제 등의 공지된 첨가제를 적절히 배합할 수 있다. 이들은 단독으로 또는 2종 이상 함께 사용해도 된다.As other optional components, known additives such as antioxidants, antistatic agents, silane coupling agents, surfactants, curing accelerators, plasticizers, fillers, crosslinking catalysts, crosslinking retarders, curing retarders, processing aids, and anti-aging agents are suitably used. It can be combined. These may be used alone or in combination of two or more.

본 발명에 따른 광학 필름용 점착제층은 상기 점착제 조성물을 기재나 이형 필름에 도포한 후, 점착제 조성물을 가교시킴으로써 형성할 수 있다. 가교 후의 광학 필름용 점착제층의 겔분율은 60∼90％가 바람직하다. 광학 필름용 점착제층의 겔분율이 이 범위 외이면, 내열성과 내구성이 저하되므로 바람직하지 않다.The pressure-sensitive adhesive layer for an optical film according to the present invention can be formed by applying the pressure-sensitive adhesive composition to a substrate or a release film and then crosslinking the pressure-sensitive adhesive composition. The gel fraction of the pressure-sensitive adhesive layer for optical films after crosslinking is preferably 60 to 90%. When the gel fraction of the pressure-sensitive adhesive layer for optical films is outside this range, heat resistance and durability are lowered, which is not preferable.

본 발명에 따른 광학 필름용 점착제층을 광학 부재의 층간 첩합 등에 사용하는 경우, 얇은 점착제층인 것이 바람직하다. 광학 필름용 점착제층의 두께는 5∼25㎛가 바람직하다. 또한, 광학 필름용 점착제층과 광학 부재의 계면에서의 광선의 반사를 저감시키기 위해, 피착체와 광학 필름용 점착제층 사이에서 굴절률의 차가 가능한 작은 것이 바람직하다.When the adhesive layer for optical films which concerns on this invention is used for interlayer bonding of an optical member, etc., it is preferable that it is a thin adhesive layer. The thickness of the pressure-sensitive adhesive layer for optical films is preferably 5 to 25 μm. Moreover, in order to reduce the reflection of light rays at the interface between the pressure-sensitive adhesive layer for optical films and the optical member, it is preferable that the difference in refractive index between the adherend and the pressure-sensitive adhesive layer for optical films is as small as possible.

또한, 본 발명의 광학 필름용 점착 필름은 본 발명의 광학 필름용 점착제층을 기재, 광학 필름, 이형 필름의 한쪽 면 위에 형성함으로써 제조할 수 있다. 광학 필름용 점착제층의 형성에 사용되는 기재 필름이나, 점착면을 보호하는 이형 필름(세퍼레이터)으로는, 폴리에스테르 필름 등의 수지 필름 등을 사용할 수 있다. 기재 필름에는 수지 필름의 광학 필름용 점착제층이 형성된 측과는 반대 면에 실리콘계, 불소계의 이형제나 코트제, 실리카 미립자 등에 의한 방오 처리, 대전 방지제의 도포나 혼입 등에 의한 대전 방지 처리를 실시할 수 있다.Moreover, the adhesive film for optical films of this invention can be manufactured by forming the adhesive layer for optical films of this invention on one surface of a base material, an optical film, and a release film. As a base film used for forming the pressure-sensitive adhesive layer for an optical film or a release film (separator) protecting the adhesive surface, a resin film such as a polyester film or the like can be used. The base film can be subjected to antistatic treatment by anti-fouling treatment with a silicone-based, fluorine-based release agent or coating agent, silica fine particles, etc., on the surface opposite to the side on which the pressure-sensitive adhesive layer for an optical film of the resin film is formed, or by application or mixing of an antistatic agent. have.

이형 필름에는 광학 필름용 점착제층의 점착면과 맞춰지는 측의 면에, 실리콘계, 불소계의 이형제 등에 의해 이형 처리가 실시된다. 1개의 광학 필름용 점착제층의 양면에 각각 이형 필름의 이형 처리가 실시된 면을 맞춤으로써, 「이형 필름/광학 필름용 점착제층/이형 필름」의 구성으로 할 수도 있다. 이 경우, 양측의 이형 필름을 순차적으로, 혹은 동시에 박리하여 점착면을 표출시킴으로써, 광학 필름 등의 광학 부재와 첩합하는 것이 가능하게 된다. 광학 필름으로는 편광 필름, 위상차 필름, 반사 방지 필름, 방현(안티 글레어) 필름, 자외선 흡수 필름, 적외선 흡수 필름, 광학 보상 필름, 휘도 향상 필름 등을 들 수 있다.The release film is subjected to a release treatment with a silicone-based, fluorine-based release agent or the like on the side of the pressure-sensitive adhesive layer for an optical film that is aligned with the adhesion surface. It can also be set as the structure of the "release film / pressure-sensitive adhesive layer for optical film / release film" by aligning the surface on which both sides of one pressure-sensitive adhesive layer for optical film is subjected to a release treatment. In this case, it is possible to bond the release films on both sides sequentially or at the same time to expose the adhesive surface, thereby bonding the optical film or other optical member. Examples of the optical film include a polarizing film, a retardation film, an antireflection film, an anti-glare (anti-glare) film, an ultraviolet absorbing film, an infrared absorbing film, an optical compensation film, and a brightness enhancing film.

본 발명에 따른 광학 필름용 점착제층은 내열성 및 내구성이 우수하므로, 편광 필름/광학 필름용 점착제층/위상차 필름/광학 필름용 점착제층/유기 EL 패널의 구성으로, 위상차 필름과 편광 필름 또는 유기 EL 패널을 첩합하는 용도에 바람직하다.Since the pressure-sensitive adhesive layer for an optical film according to the present invention is excellent in heat resistance and durability, as a configuration of a pressure-sensitive adhesive layer for a polarizing film/optical film/phase difference film/pressure-sensitive adhesive layer for an optical film/organic EL panel, a retardation film and a polarizing film or organic EL It is suitable for the application of bonding panels.

본 발명의 광학 필름용 점착제층 및 광학 필름용 점착 필름은 화상 표시 장치에 장착되는 각종 광학 필름, 터치 패널용 각종 광학 필름, 전자 종이용 각종 광학 필름, 액정 패널에 장착되는 각종 광학 필름, 유기 EL 패널에 장착되는 각종 광학 필름의 첩합에 사용할 수 있다. 또한, 이들 광학 필름의 적어도 일방의 면에 상기 광학 필름용 점착제층이 적층되어 있는 점착제층이 형성된 광학 필름으로 할 수 있다. 이형 필름으로 보호된 광학 필름용 점착제층을 갖는 경우, 이형 필름을 박리하여 「광학 필름/광학 필름용 점착제층」과 같이 광학 필름용 점착제층을 표출시켜, 다른 광학 필름과 첩합함으로써, 층간에 광학 필름용 점착제층이 사용된 「광학 필름/광학 필름용 점착제층/광학 필름」과 같은 구성이 얻어진다.The pressure-sensitive adhesive layer for optical films of the present invention and the pressure-sensitive adhesive film for optical films are various optical films mounted on an image display device, various optical films for touch panels, various optical films for electronic paper, various optical films mounted on liquid crystal panels, and organic EL. It can be used for bonding of various optical films mounted on a panel. Moreover, it can be set as the optical film in which the adhesive layer in which the said adhesive layer for optical films is laminated|stacked on at least one surface of these optical films. In the case of having the pressure-sensitive adhesive layer for an optical film protected by a release film, the release film is peeled to expose the pressure-sensitive adhesive layer for an optical film as in the "optical film/pressure-sensitive adhesive layer for optical films", and bonded to another optical film, thereby inter-layer optical The structure similar to "Adhesive layer for optical film/optical film/Optical film" in which the adhesive layer for films is used is obtained.

본 발명의 광학 필름용 점착제층은 화상 표시 장치에 장착되는 각종 광학 필름의 첩합에 바람직하게 사용된다. 본 발명의 광학 필름용 점착제층은 「편광 필름/광학 필름용 점착제층」, 「편광 필름/광학 필름용 점착제층/이형 필름」, 「편광 필름/광학 필름용 점착제층/위상차 필름/광학 필름용 점착제층」, 「편광 필름/광학 필름용 점착제층/위상차 필름/광학 필름용 점착제층/이형 필름」 등의 구성에서도 바람직하게 사용할 수 있다.The pressure-sensitive adhesive layer for optical films of the present invention is preferably used for bonding of various optical films attached to an image display device. The pressure-sensitive adhesive layer for optical films of the present invention includes "polarizing film/pressure-sensitive adhesive layer for optical films", "polarizing film/pressure-sensitive adhesive layer for optical films/release film", "polarizing film/pressure-sensitive adhesive layer for optical films/phase difference film/optical film" Adhesive layer", "polarizing film / adhesive layer for optical film / phase difference film / adhesive layer for optical film / release film", etc. can also be preferably used.

본 발명에 따른 화상 표시 장치로는 액정 표시 장치(액정 패널), 유기 EL 표시 장치(액정 패널), 터치 패널, 전자 종이 등을 들 수 있지만, 이들에 한정되지 않는다. 이하, 유기 EL 패널을 대표적인 예로 들어 설명하나, 이들 개념에 기초하는 본 발명은 액정 패널 등 다른 화상 표시 장치에도 적용 가능하다.Examples of the image display device according to the present invention include, but are not limited to, a liquid crystal display device (liquid crystal panel), an organic EL display device (liquid crystal panel), a touch panel, electronic paper, and the like. Hereinafter, an organic EL panel will be described as a representative example, but the present invention based on these concepts can be applied to other image display devices such as liquid crystal panels.

유기 EL 패널에 장착되는 위상차 필름의 재질로는 폴리카보네이트 화합물을 들 수 있고, 역파장 분산성(복굴절이 장파장일수록 증대)을 갖는 재료가 바람직하다. 폴리카보네이트 화합물은 중합체의 반복 단위 중에 카보네이트 결합(-O-CO-O-)을 포함하는 수지이며, 각 카보네이트 결합 간에 포함되는 화학 구조에는 방향족계, 지방족계 등의 각종이 알려져 있다. 반복 단위는 1종이어도 되고 2종 이상이어도 된다. 위상차 필름의 위상차로는 1/4λ 또는 1/2λ(파장λ의 1/4배 또는 1/2배)를 들 수 있다.A material of the retardation film mounted on the organic EL panel includes a polycarbonate compound, and a material having reverse wavelength dispersion (increasing as birefringence becomes longer) is preferable. The polycarbonate compound is a resin containing a carbonate bond (-O-CO-O-) in a repeating unit of the polymer, and various chemical structures, such as aromatic and aliphatic, are known in the chemical structure included between each carbonate bond. The repeating unit may be one type or two or more types. The phase difference of the retardation film may be 1/4λ or 1/2λ (1/4 times or 1/2 times the wavelength λ).

그 중에서도 근래에, 유기 EL 패널은 외광 반사 방지를 위한 원 편광판이 필요하게 되었는데, 원 편광판은 직선 편광 필름과 1/4λ 위상차 필름을 2장 중첩시킨 구성이며, 또한 위상차 필름면을 유기 EL 패널에 첩합시키기 때문에, 폴리카보네이트계 수지가 원인이 되어 내구성, 내발포성이 떨어진다고 하는 결점이 있었다.Among them, in recent years, an organic EL panel requires a circular polarizing plate for preventing external light reflection. The circular polarizing plate has a structure in which two linear polarizing films and 1/4 λ phase difference films are superimposed, and the phase difference film surface is also attached to the organic EL panel. Because of the bonding, there was a drawback that the polycarbonate-based resin was the cause, and the durability and foam resistance were poor.

본 발명의 광학 필름용 점착제층은 폴리카보네이트계 수지로 이루어지는 1/4λ인 위상차 필름이 장착된 편광 필름 및 유기 EL 패널의 광학 필름의 첩합용으로서 이용 가치가 극히 높다.The pressure-sensitive adhesive layer for an optical film of the present invention has extremely high utility value for bonding a polarizing film equipped with a retardation film of 1/4λ made of a polycarbonate-based resin and an optical film of an organic EL panel.

편광 필름으로는 요오드 분자(I2)를 포함하는 폴리비닐알코올(PVA)층을 편광자로 하고, 그 양측에 트리아세틸셀룰로오스(TAC), COP(시클로올레핀 폴리머), 아크릴 수지, 폴리프로필렌(PP) 등의 광학 특성(투명성 등)이 우수한 재료를 사용한 수지 필름을 보호층(편광자의 보호 필름으로 불리는 경우도 있다)으로서 적층한 구성이 일반적으로 사용되고 있다. 또한, 보호층의 수지 필름이 위상차 필름의 기능을 겸하는 경우도 있다.As a polarizing film, a polyvinyl alcohol (PVA) layer containing an iodine molecule (I 2 ) is used as a polarizer, and triacetylcellulose (TAC), COP (cycloolefin polymer), acrylic resin, and polypropylene (PP) on both sides thereof. A structure in which a resin film using a material having excellent optical properties (such as transparency) is laminated as a protective layer (sometimes referred to as a protective film for polarizers) is generally used. Moreover, the resin film of a protective layer may also function as a retardation film.

유기 EL 패널로는 유기 발광 다이오드(OLED) 구조를 갖고, 정극과 부극의 전극 사이에 정공 주입층, 정공 수송층, 발광층, 전자 수송층, 전자 주입층 등 복수의 기능층이 형성, 적층된 발광 소자를 갖는 구성을 들 수 있다. 전극으로는 투광성을 갖는 투명 전극층과 불투명한 금속 전극층을 들 수 있다. 플렉시블한 유기 EL 패널도 제조 가능하고, 수지 등의 플렉시블 기재 위에 박, 도금, 인쇄, 증착, 스퍼터 등에 의해, 전극, 배선, 기능층 등을 형성할 수 있다.An organic EL panel has an organic light emitting diode (OLED) structure, and a light emitting device in which a plurality of functional layers such as a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer is formed and stacked between electrodes of a positive electrode and a negative electrode. The structure to have is mentioned. Examples of the electrode include a transparent electrode layer having light transmittance and an opaque metal electrode layer. Flexible organic EL panels can also be manufactured, and electrodes, wirings, functional layers, etc. can be formed on flexible substrates such as resins by foil, plating, printing, vapor deposition, sputtering, or the like.

실시예Example

이하, 실시예를 통해 본 발명을 구체적으로 설명한다.Hereinafter, the present invention will be described in detail through examples.

〈아크릴계 폴리머의 제조〉<Production of acrylic polymer>

[실시예 1][Example 1]

반응 용기, 교반기, 온도계, 환류 냉각기 및 질소 도입관을 구비한 반응 장치에 질소 가스를 도입하여, 반응 용기 내의 공기를 질소 가스로 치환하였다. 그 후, 반응 용기에 2-에틸헥실아크릴레이트 70중량부, t-부틸아크릴레이트 30중량부, 2-아크릴로일옥시에틸헥사히드로프탈산 0.5중량부, 8-히드록시옥틸아크릴레이트 0.3중량부와 함께 용제(초산에틸)를 60중량부 첨가하였다. 그 후, 중합 개시제로서 아조비스이소부티로니트릴 0.1중량부를 2시간에 걸쳐 적하시키고, 65℃에서 6시간 반응시켜, 실시예 1의 아크릴계 폴리머 용액을 얻었다.Nitrogen gas was introduced into the reaction apparatus equipped with the reaction vessel, agitator, thermometer, reflux cooler, and nitrogen introduction pipe, and air in the reaction vessel was replaced with nitrogen gas. Then, 70 parts by weight of 2-ethylhexyl acrylate, 30 parts by weight of t-butyl acrylate, 0.5 parts by weight of 2-acryloyloxyethyl hexahydrophthalic acid, and 0.3 parts by weight of 8-hydroxyoctyl acrylate were added to the reaction vessel. Together, 60 parts by weight of a solvent (ethyl acetate) was added. Thereafter, 0.1 part by weight of azobisisobutyronitrile was added dropwise over 2 hours as a polymerization initiator, and reacted at 65°C for 6 hours to obtain an acrylic polymer solution of Example 1.

[실시예 2∼5 및 비교예 1∼3][Examples 2 to 5 and Comparative Examples 1 to 3]

아크릴계 폴리머를 구성하는 각 모노머의 종류, 배합 비율을 각각 표 1의 (A)∼(C)군의 기재와 같이 한 이외에는 상기 실시예 1과 동일하게 하여, 실시예 2∼5 및 비교예 1∼3의 아크릴계 폴리머 용액을 얻었다.The types and blending ratios of the monomers constituting the acrylic polymer were the same as those in Example 1, except that the groups (A) to (C) in Table 1 were respectively described, and Examples 2 to 5 and Comparative Examples 1 to An acrylic polymer solution of 3 was obtained.

〈점착제 조성물, 광학 필름용 점착제층 및 광학 필름용 점착 필름의 제조〉<Production of adhesive composition, adhesive layer for optical films, and adhesive film for optical films>

[실시예 1][Example 1]

상기와 같이 제조한 반응 용기 내의 실시예 1의 아크릴계 폴리머 용액에 1,3-비스(디글리시딜아미노메틸)시클로헥산 0.01중량부를 첨가하고 교반 혼합하여, 실시예 1의 점착제 조성물을 얻었다. 이 점착제 조성물을 이형 필름(실리콘 수지 코트된 폴리에틸렌테레프탈레이트(PET) 필름) 위에 건조 후의 두께가 10㎛가 되도록 도포 후, 90℃에서 5분간 건조시켜 점착제층을 형성하였다. 그 후, 건조시킨 점착제층 위에 이형 처리한 이형 필름을 중첩하여, 이형 필름/광학 필름용 점착제층/이형 필름으로 이루어지는 층 구성으로 하였다. 추가로 23℃, 50％ RH의 분위기하에서 7일간의 에이징(양생)을 함으로써, 실시예 1의 광학 필름용 점착 필름을 얻었다.To the acrylic polymer solution of Example 1 in the reaction vessel prepared as described above, 0.01 part by weight of 1,3-bis(diglycidylaminomethyl)cyclohexane was added and stirred and mixed to obtain the pressure-sensitive adhesive composition of Example 1. The pressure-sensitive adhesive composition was coated on a release film (silicon resin-coated polyethylene terephthalate (PET) film) so that the thickness after drying was 10 µm, and then dried at 90° C. for 5 minutes to form an pressure-sensitive adhesive layer. Thereafter, the release film subjected to the release treatment was superimposed on the dried pressure-sensitive adhesive layer to obtain a layer structure composed of a release film/pressure-sensitive adhesive layer for optical film/release film. Further, by performing aging (curing) for 7 days in an atmosphere of 23° C. and 50% RH, an adhesive film for an optical film of Example 1 was obtained.

[실시예 2∼5 및 비교예 1∼3][Examples 2 to 5 and Comparative Examples 1 to 3]

가교성 화합물의 종류, 배합 비율을 각각 표 1의 (D)군의 기재와 같이 하고, 건조 후의 점착제층의 두께가 표 3의 값이 되도록 한 이외에는 상기 실시예 1과 동일하게 하여, 실시예 2∼5 및 비교예 1∼3의 광학 필름용 점착 필름을 얻었다.Example 2 was the same as in Example 1 except that the type and blending ratio of the crosslinkable compound were as described in the group (D) in Table 1, and the thickness of the pressure-sensitive adhesive layer after drying was the value in Table 3. The adhesive films for optical films of -5 and Comparative Examples 1-3 were obtained.

Figure 112020024522810-pat00001
Figure 112020024522810-pat00001

표 1에 있어서, (A)군의 알킬기의 탄소수가 C1∼C14인 알킬(메타)아크릴레이트 모노머(a1)과, 방향족기를 갖는 (메타)아크릴레이트 모노머(a2)와, 질소 함유 비닐 모노머(a3)으로 이루어지는 모노머군에서 선택된 2종 이상의 모노머의 합계를 100중량부(단, 상기 (a1)에 속하는 모노머의 1종을 51중량부 이상 95중량부 이하와, 상기 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 다른 1종 이상의 모노머의 합계를 5중량부 이상 49중량부 이하의 합계가 100중량부가 된다)로 하였다. 또한, (B)군 내지 (D)군까지의 첨가 비율로서 중량부의 수치를 괄호 안에 나타낸다. 여기서, (B)군은 카르복실기 함유 공중합성 비닐 모노머, (C)군은 수산기 함유 공중합성 비닐 모노머, (D)군은 가교성 화합물이다.In Table 1, the alkyl (meth)acrylate monomer (a1) having C1 to C14 carbon atoms in the alkyl group of group (A), the (meth)acrylate monomer (a2) having an aromatic group, and the nitrogen-containing vinyl monomer (a3) ) Is 100 parts by weight of the total of two or more types of monomers selected from the group consisting of monomers (however, one type of monomers belonging to (a1) above is 51 parts by weight to 95 parts by weight, and (a1) to (a3) above. The sum of the other one or more monomers selected from the group consisting of monomers was 5 parts by weight or more and 49 parts by weight or less to 100 parts by weight). In addition, numerical values of parts by weight are shown in parentheses as the ratio of addition to the groups (B) to (D). Here, the group (B) is a copolymerizable vinyl monomer containing a carboxyl group, the group (C) is a copolymerizable vinyl monomer containing a hydroxyl group, and the group (D) is a crosslinkable compound.

또한, 표 1에 나타낸 각 성분의 약기호에 대한 화합물명을 표 2에 나타내었다. 여기서, TETRAD(등록상표)-C 및 X는 미츠비시 가스 화학 주식회사의 상품명이며, 코로네이트(등록상표) HX 및 L은 도소 주식회사의 상품명이다. TDI는 톨릴렌디이소시아네이트를 의미하고, TMP는 트리메틸올프로판을 의미하며, HDI는 헥사메틸렌디이소시아네이트를 의미한다.In addition, Table 2 shows the compound names for the abbreviations of the respective components shown in Table 1. Here, TETRAD (registered trademark)-C and X are trade names of Mitsubishi Gas Chemical Co., Ltd., and Coronate (registered trademark) HX and L are trade names of Tosoh Corporation. TDI means tolylene diisocyanate, TMP means trimethylolpropane, and HDI means hexamethylene diisocyanate.

Figure 112020024522810-pat00002
Figure 112020024522810-pat00002

〈시험 방법 및 평가〉<Test method and evaluation>

얻어진 실시예 1∼5 및 비교예 1∼3의 광학 필름용 점착 필름으로부터 이형 필름(실리콘 수지 코트된 PET 필름)을 박리하고 광학 필름용 점착제층을 표출시켜, 각종 측정용 및 시험용 시료로 하였다.The release film (silicone resin-coated PET film) was peeled from the obtained adhesive films for optical films of Examples 1 to 5 and Comparative Examples 1 to 3, and the adhesive layer for optical films was exposed to prepare samples for various measurements and tests.

〈광학 필름용 점착제층의 겔분율의 측정 방법〉<Measurement method of gel fraction of adhesive layer for optical films>

측정 시료인 점착제층의 질량을 정확하게 측정한 후, 실온의 톨루엔액 중에 24시간 침지하여 용해 성분을 용출 후, 200메시의 철망으로 여과한다. 그 후, 여과물을 100℃에서 1시간 건조시킨 후, 잔류물의 질량을 정확하게 측정하여, 이하의 식으로부터 광학 필름용 점착제층(가교 후의 광학 필름용 점착제층)의 겔분율을 산출하였다.After accurately measuring the mass of the pressure-sensitive adhesive layer as a measurement sample, it is immersed in a toluene solution at room temperature for 24 hours to elute the dissolved components, and then filtered through a 200 mesh wire mesh. Thereafter, the filtrate was dried at 100° C. for 1 hour, the mass of the residue was accurately measured, and the gel fraction of the pressure-sensitive adhesive layer for optical films (pressure-sensitive adhesive layer for optical films after cross-linking) was calculated from the following equation.

광학 필름용 점착제층의 겔분율(％)＝불용 부분 질량(g)/점착제층의 질량(g)×100Gel fraction (%) of the adhesive layer for optical films = insoluble partial mass (g)/mass of adhesive layer (g) x 100

〈내구성의 시험 방법〉<Durability test method>

폴리카보네이트 수지 필름으로 이루어지는 위상차 필름(테이진 주식회사 제조, 형식 PURE-ACE WR)의 양면에 각각 광학 필름용 점착제층을 전사하고, 추가로 그 한쪽 면에 편광 필름을 첩합하여 얻어진 점착제층이 형성된 광학 필름의 적층체를 무알칼리 유리(코닝사 제조 EAGLE-XG 두께 0.7㎜)에 첩합하고, 오토클레이브 처리(50℃, 5기압×20분)하고 나서 85℃ dry 분위기하에서 200시간 보관한 후, 23℃×50％ RH 분위기하에 꺼내어 1시간 후에 육안으로 확인하여 내구성을 판단하였다. 육안 확인에 의한 판정 기준은 다음과 같이 하였다.Optical which has the adhesive layer obtained by transferring the adhesive layer for optical films to both sides of the retardation film (made by Teijin Corporation, type PURE-ACE WR) which consists of polycarbonate resin film, and also attaching the polarizing film to one side of it. The laminated body of the film was adhered to an alkali-free glass (EAGLE-XG 0.7 mm thick manufactured by Corning), autoclaved (50°C, 5 atmospheres x 20 minutes) and then stored in a dry atmosphere at 85°C for 200 hours, followed by 23°C. It was taken out under a ×50% RH atmosphere and visually confirmed after 1 hour to determine durability. The judgment criteria by visual confirmation were as follows.

○··광학 필름용 점착제층의 박리 및 발포가 전혀 없다.There is no peeling or foaming of the adhesive layer for optical films.

△··광학 필름용 점착제층에 박리 및 발포가 발생하였다.Peeling and foaming occurred in the pressure-sensitive adhesive layer for the optical film.

×··광학 필름용 점착제층 전체에 박리 및 발포가 발생하였다.Peeling and foaming occurred in the entire adhesive layer for the optical film.

표 3에 평가 결과를 나타낸다. 「광학 필름용 점착제층의 두께」는 내구성 시험에서 사용한 광학 필름용 점착제층의 두께를 나타낸다.Table 3 shows the evaluation results. "The thickness of the pressure-sensitive adhesive layer for optical films" refers to the thickness of the pressure-sensitive adhesive layer for optical films used in the durability test.

Figure 112020024522810-pat00003
Figure 112020024522810-pat00003

본 발명에 따른 광학 필름용 점착제층인 실시예 1∼5의 광학 필름용 점착 필름으로부터 표출된 광학 필름용 점착제층은 편광 필름/광학 필름용 점착제층/위상차 필름/광학 필름용 점착제층/무알칼리 유리의 구성으로, 유기 EL 패널을 본뜬 적층체를 제작한 후, 85℃ 200시간 후의 내구성에서 발포하는 경우가 없었다. 즉, 본 발명에 따른 광학 필름용 점착제층은 위상차 필름과 편광 필름 또는 유기 EL 패널과의 층간 첩합에 사용했을 때, 우수한 내열성 및 내구성을 갖고 있다.The pressure-sensitive adhesive layer for optical films expressed from the pressure-sensitive adhesive film for optical films of Examples 1 to 5, which is the pressure-sensitive adhesive layer for optical films according to the present invention, is a pressure-sensitive adhesive layer for polarizing film/optical film/phase difference film/pressure-sensitive adhesive layer for optical film/alkali free With the structure of glass, after producing a laminate modeling an organic EL panel, there was no case of foaming at durability after 200 hours at 85°C. That is, the adhesive layer for an optical film according to the present invention has excellent heat resistance and durability when used for interlayer bonding between a retardation film and a polarizing film or an organic EL panel.

비교예 1의 광학 필름용 점착 필름은 광학 필름용 점착제 조성물의 아크릴계 폴리머에 있어서, 카르복실기 함유 공중합성 비닐 모노머의 사용량이 과소이고, 아크릴계 폴리머의 Tg가 높으며, 광학 필름용 점착제층의 겔분율이 높고, 내구성 시험에 있어서 광학 필름용 점착제층에 부분적인 발포가 관찰되었다.In the adhesive film for optical films of Comparative Example 1, in the acrylic polymer of the adhesive composition for optical films, the amount of the carboxyl group-containing copolymerizable vinyl monomer is small, the Tg of the acrylic polymer is high, and the gel fraction of the adhesive layer for optical films is high. , In the durability test, partial foaming was observed in the pressure-sensitive adhesive layer for an optical film.

비교예 2의 광학 필름용 점착 필름은 광학 필름용 점착제 조성물의 아크릴계 폴리머에 있어서, 수산기 함유 공중합성 비닐 모노머를 사용하지 않는 대신에 카르복실기 함유 공중합성 비닐 모노머의 사용량이 과다하고, 아크릴계 폴리머와 가교제의 반응성이 높으며, 도공 전에 겔화가 진행되었기 때문에 도공할 수 없었다(이 경우, 가교 후의 겔분율은 개략 100％라고 할 수 있다).In the adhesive film for optical films of Comparative Example 2, in the acrylic polymer of the adhesive composition for optical films, instead of using a hydroxyl group-containing copolymerizable vinyl monomer, the amount of the carboxyl group-containing copolymerizable vinyl monomer is excessive, and the acrylic polymer and the crosslinking agent The reactivity was high and coating was not possible because gelling had progressed before coating (in this case, the gel fraction after crosslinking can be said to be approximately 100%).

비교예 3의 광학 필름용 점착 필름은 광학 필름용 점착제층의 겔분율이 낮고, 내구성 시험에 있어서 현저한 발포가 관찰되었다.In the adhesive film for optical films of Comparative Example 3, the gel fraction of the adhesive layer for optical films was low, and significant foaming was observed in the durability test.

이와 같이, 비교예 1∼3의 광학 필름용 점착 필름에서는 광학 필름용 점착제층이 내구성을 구비할 수 없었다.As described above, in the adhesive films for optical films of Comparative Examples 1 to 3, the adhesive layer for optical films could not have durability.

Claims (5)

아크릴계 폴리머와 가교성 화합물을 포함하는 광학 필름용 점착제 조성물을 가교하여 이루어지는 광학 필름용 점착제층으로서,
상기 아크릴계 폴리머가
(A) 알킬기의 탄소수가 C2∼C14인 알킬(메타)아크릴레이트 모노머(a1), 방향족기를 갖는 (메타)아크릴레이트 모노머(a2) 및 질소 함유 비닐 모노머(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부와,
(B) 카르복실기 함유 공중합성 비닐 모노머 0.1∼10.0중량부와,
(C) 수산기 함유 공중합성 비닐 모노머 0.05∼4.5중량부를 공중합시킨, Tg가 －60℃ 이상 －30℃ 이하인 공중합체로 이루어지고,
상기 (A)군에 속하는 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부 중, 상기 (a1)에 속하는 모노머의 1종을 51중량부 이상 95중량부 이하와, 상기 (a2)에 속하는 모노머군의 1종 이상을 3∼25중량부의 비율로 함유하여 이루어지며,
상기 가교성 화합물이 2관능 이상의 에폭시계 화합물이고,
상기 광학 필름용 점착제 조성물이, 상기 (a1)∼(a3)으로 이루어지는 모노머군 중에서 선택된 적어도 2종 이상의 모노머의 합계 100중량부에 대해, 상기 가교성 화합물을 0.001∼0.5중량부의 비율로 함유하여 이루어지며,
상기 광학 필름용 점착제층의 겔분율이 60∼90％이고, 상기 광학 필름용 점착제층의 두께가 5∼25㎛인 것을 특징으로 하는 광학 필름용 점착제층.As an adhesive layer for an optical film formed by crosslinking the adhesive composition for an optical film containing an acrylic polymer and a crosslinkable compound,
The acrylic polymer
(A) At least 2 selected from the group consisting of an alkyl (meth)acrylate monomer (a1) having C2 to C14 carbon atoms, an (meth)acrylate monomer having an aromatic group (a2), and a nitrogen-containing vinyl monomer (a3). 100 parts by weight of the total monomer or more,
(B) 0.1 to 10.0 parts by weight of a copolymerizable vinyl monomer containing a carboxyl group,
(C) a copolymer having a hydroxyl group-containing copolymerizable vinyl monomer of 0.05 to 4.5 parts by weight and having a Tg of -60°C to -30°C or less,
Of 100 parts by weight of the total of at least two or more monomers selected from the monomer group consisting of (a1) to (a3) belonging to the group (A), 51 parts by weight or more and 95 parts by weight of one of the monomers belonging to (a1) It is made by containing at least 3 to 25 parts by weight of one or more monomer groups belonging to the above (a2),
The crosslinkable compound is a bifunctional or higher epoxy-based compound,
The pressure-sensitive adhesive composition for an optical film is made by containing the crosslinkable compound in a proportion of 0.001 to 0.5 parts by weight based on 100 parts by weight of a total of at least two or more monomers selected from the monomer group consisting of (a1) to (a3). Lose,
The adhesive layer for an optical film, characterized in that the gel fraction of the adhesive layer for an optical film is 60 to 90%, and the thickness of the adhesive layer for an optical film is 5 to 25 µm. 제 1 항의 광학 필름용 점착제층이 이형 필름의 한쪽 면에 형성되어 이루어지며, 이형 필름/광학 필름용 점착제층/이형 필름의 구성인 것을 특징으로 하는 광학 필름용 점착 필름.The adhesive film for optical film according to claim 1, wherein the adhesive layer for optical film is formed on one side of a release film, and is a structure of a release film/adhesive layer for optical film/release film. 기재의 한쪽 면 위에 제 1 항의 광학 필름용 점착제층이 적층된 것을 특징으로 하는 광학 필름용 점착 필름.A pressure-sensitive adhesive film for an optical film, characterized in that the pressure-sensitive adhesive layer for optical film of claim 1 is laminated on one side of the substrate. 제 1 항의 광학 필름용 점착제층이 광학 필름의 첩합에 사용된 화상 표시 장치.An image display device in which the pressure-sensitive adhesive layer for optical films according to claim 1 is used for bonding optical films. 제 1 항의 광학 필름용 점착제층이 사용된 점착제층이 형성된 편광판.A polarizing plate on which the pressure-sensitive adhesive layer in which the pressure-sensitive adhesive layer for optical films of claim 1 is used is formed.
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