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AssigneeLintec Corporation
InventorsKentaro Kusama, Koichi Nagamoto, Mikihiro Kashio, Kazuhiro Kon, Motoyuki Hayakawa
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Provided are a pressure-sensitive adhesive for polarizing plates which can apply a polarizing plate on a liquid crystal cell with good adhesion and has the characteristic that a liquid crystal display device obtained therefrom is less liable to cause light leakage even under the environment of high temperature and high humidity and which has a removability and a polarizing plate with the above pressure-sensitive adhesive and a production process for the same. The pressure-sensitive adhesive for polarizing plates is prepared by irradiating a pressure-sensitive adhesive material comprising (A) an acrylic base polymer comprising 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 with an active energy beam and it has a storage elastic modulus (G′) of 0.3 MPa or more at 23° C.
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.
Dependencies are inferred from the claim text.