Photosemiconductor encapsulant of epoxy group-containing (meth) acrylic polymer and alicyclic anhydride

摘要

A photosemiconductor encapsulating resin composition, excellent in light transmittance, ultraviolet resistance and heat resistance, comprising the following component (A) and component (B): (A): a (meth)acrylic polymer containing an epoxy group, and (B): at least one hardener selected from the group consisting of the following components (b₁) to (b₄): (b₁) a polyvalent carboxylic acid, (b₂) a polyvalent carboxylic anhydride, (b₃) a reaction product of a polyvalent carboxylic acid with a compound of the following general formula (B-1), and (b₄) a reaction product of a polyvalent carboxylic anhydride with a compound of the following general formula (B-2) wherein R¹ to R⁶ represent each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, R³ and R⁴ may be bonded to form an alkylene group having 1 to 8 carbon atoms; R⁷ represents an alkylene group; a methylene group contained the alkylene group and the alkyl group represented by R¹ to R⁷ may be substituted by an ether group and/or carbonyl group; Y¹ and Y² represent each independently an oxygen atom, or sulfur atom, is provided.