Patent ID: 8420766
Filing Date: 2013-04-16
Classification: C08G,C08J,H01L,H05K,Y02P

Abstract:
1. A method for manufacturing a plant-based biomass-derived epoxy resin composition comprising an epoxy resin; and a curing agent which is a biomass-derived acid anhydride having an acid anhydride bonded via an ester linkage to a biomass with a weight-average molecular weight of 300 to 5000, the method comprising the steps of: depolymerizing a cured material of the biomass-derived epoxy resin composition by using an alkali metal compound to obtain a recovered biomass, the cured material having a glass transition temperature of 150° C. or more, and using the recovered biomass as a raw material for a curing agent and/or an epoxy resin again, the recovered biomass having a phenolic hydroxyl group and an alcoholic hydroxyl group.