PLASTIC LIDDING MATERIAL FOR SOLID-STATE IMAGE PICKUP ELEMENT PACKAGE AND METHOD FOR MANUFACTURING THE SAME

摘要

A plastic lidding material for a solid-state image pickup element package which is reduced in specific gravity, excellent in fabricability, transparency, toughness of adhesion, dimensional stability and solvent resistance, and also in heat resistance and mechanical characteristics. The lidding material comprises a cross-linked acrylic copolymer prepared by the urethanization and radical polymerization among (A) a (meth)acrylic ester monomer having a secondary hydroxyl group, (B) at least one diisocyanate compound selected among dicyclohexylmethane 4,4'-diisocyanate, isophorone diisocyanate, and 1,3-bis(isocyanatomethyl)cyclohexane, and (C) a monomer which is radical-copolymerizable with the monomer (A).