PRESSURE SENSITIVE ADHESIVE OPTICAL PRESSURE SENSITIVE ADHESIVE SHEET PRESSURE SENSITIVE ADHESIVE SHEET FOR POLARIZING PLATE AND LIQUID CRYSTAL CELL MEMBER

• Main Authors: KOBAYASHI TAKAYUKI, FUKUTA KATSUNORI
• Format: Patent
• Language: English; Korean
• Published: 27.10.2017
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; DYES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PAINTS; PHYSICS; POLISHES; USE OF MATERIALS AS ADHESIVES

[과제] 박리성이 우수하고 고온 환경 하 또는 고온 고습 환경 하에 노출된 후, 피착체로부터의 들뜸이나 박리가 발생하기 어려운 점착제,광학용 점착시트, 편광판 점착 시트 및 액정 셀 부재를 제공하는 것. [해결 수단] 아크릴계 공중합체(A) 및 경화제(B)를 포함하는 점착제로, 아크릴계 공중합체(A)가, (a-1) (메타)아크릴산 알킬 에스테르 모노머, (a-2) (메타)아크릴산 히드록시에스테르 모노머, (a-3) 하기 식[I]으로 나타내는 모노머, 및 (a-4) 하기 식[II]으로 나타내는 모노머 유래의 구성 단위를 함유하고, 산성기 함유 모노머를 함유하지 않고, 중량평균분자량(Mw)과 수평균분자량(Mn)의 비(Mw/Mn)가 1.5~2.5인 점착제. 식 중, R및 R는 수소원자 또는 메틸기를 나타낸다. n 및 m은 정수이며, 1≤n≤10, 1≤m≤10이다. To provide an adhesive having excellent removability, less likely inducing blisters or peeling from an adherend after the adhesive is subjected to a high temperature environment or a high temperature and high humidity environment, and causing no operation failure or the like due to electrode corrosion even when stuck to a conductive member, and an adhesive sheet using the above adhesive. The adhesive comprises an acrylic copolymer (A) and a curing agent (B). The acrylic copolymer (A) comprises structural units derived from monomers represented by (a-1) to (a-4) below and no structural unit derived from an acidic group-containing monomer, and has a dispersion degree (Mw/Mn) of 1.5-2.5 that is a ratio of a weight average molecular weight (Mw) to a number average molecular weight (Mn). The monomers are: (a-1) an alkyl (meth)acrylate monomer; (a-2) a hydroxy (meth)acrylate monomer; (a-3) a phenoxy group-containing (meth)acrylic acid monomer represented by formula [I]; and (a-4) a methoxy group-containing (meth)acrylic acid monomer represented by formula [II].