PROCESS FOR PRODUCING ACID ANHYDRIDE-BASED EPOXY RESIN CURING AGENT, ACID ANHYDRIDE-BASED EPOXY RESIN CURING AGENT, EPOXY RESIN COMPOSITION, AND CURED PRODUCT AND OPTICAL SEMICONDUCTOR DEVICE USING SAME

摘要

The present invention relates to a method for producing an acid anhydride based epoxy resin curing agent, acid anhydride-based epoxy resin curing agent, the epoxy resin composition and its cured product and an optical semiconductor device. Method for producing an acid anhydride based epoxy resin curing agent of the invention is a mixture containing a multivalent carboxylic acid anhydride and a polyester resin, it characterized in that it comprises a step of heating in the presence of hydrogen gas and a hydrogenation catalyst.