| 摘要 |
PURPOSE: A developable polyfunctional (meth)acrylic acid ester copolymer is provided to have low color dispersibility, high transmittance, low absorption, excellent processability, and excellent termal resistance. CONSTITUTION: A developable polyfunctional (meth)acrylic acid ester copolymer is obtained by copolymerization of components comprising monofunctional (meth)acrylic acid ester having a cycloaliphatic structure, bifunctional (meth)acrylic acid ester, 2,4-diphenyl-4-methyl-1-penene and a thiol compound, has a reactive (meth)acrylate group orininated from the bifunctional (meth)acrylic acid ester, and has a unit structure originated from 2,4-dipenyl-4-methyl-1-pentene and a thiol compound. The copolymer has an average molecular weight of 2,000-60,000, and is soluble into toluene, xylene, tetrahydrofuran, dichloroethane or chloroform.
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