Patent ID: 8568873
Filing Date: 2013-10-29
Classification: C09J,G02B,Y10T

Abstract:
1. A pressure-sensitive adhesive for polarizing plates, which is prepared by irradiating a pressure-sensitive adhesive material comprising (A) an acrylic base polymer comprising a structural unit obtained from a monomer having a carboxyl group in a monomer composition ratio of 0.5 mass % or less and (B) an active energy beam-curable compound, wherein the active energy beam-curable compound is a multifunctional (meth)acrylate base monomer having a cyclic structure, and a photopolymerization initiator, with an active energy beam and wherein the pressure-sensitive adhesive has a storage elastic modulus (G′) of 0.3 MPa or more at 23° C., wherein the ratio (A)/(B) is in a range from 100:10 to 100:50 by mass ratio, and (A) is a polymer consisting of units from at least one monomer selected from the group consisting of methyl(meth)acrylate, ethyl(meth)acrylate, propyl(meth)acrylate, butyl(meth)acrylate, pentyl(meth)acrylate, hexyl(meth)acrylate, cyclohexyl(meth)acrylate, 2-ethylhexyl(meth)acrylate, isooctyl(meth)acrylate, decyl(meth)acrylate, dodecyl(meth)acrylate, myristyl(meth)acrylate, palmityl(meth)acrylate, stearyl(meth)acrylate, 2-hydroxyethyl(meth)acrylate, 2-hydroxypropyl(meth)acrylate, 3-hydroxypropyl(meth)acrylate, 2-hydroxybutyl(meth)acrylate, 3-hydroxybutyl(meth)acrylate and 4-hydroxybutyl(meth)acrylate, acrylamide, methacrylamide, N-methylacrylamide, N-methylmethacrylamide, N-methylolacrylamide and N-methylolmethacrylamide, monomethylaminoethyl(meth)acrylate, monoethylaminoethyl(meth)acrylate, monomethylaminopropyl(meth)acrylate and monoethylaminopropyl(meth)acrylate, and optionally one or more monomers selected from the group consisting of (meth)acrylic acid, crotonic acid, maleic acid, and itaconic acid.