Patent ID: 6512031
Filing Date: 2003-01-28
Classification: C08G,C08K,C08L,H01L,Y10T

Abstract:
An epoxy resin composition comprising:(A) a difunctional bisphenol type epoxy resin or a difunctional biphenyl type epoxy resin, (B) a first curing agent comprising a difunctional phenolic resin for polymerizing the epoxy resin (A) into a linear polymer, wherein the difunctional epoxy resin and the difunctional phenolic resin are blended in such amounts that the equivalent ratio of epoxy groups to phenolic hydroxyl groups ranges from more than 1/1 to 10/1, (C) a second curing agent comprising an imidazole compound for crosslinking the linear polymer of components (A) and (B) into a three-dimensional polymer, wherein the imidazole compound is employed at a weight ratio of from 0.001 through 0.2 with respect to the weight of the polymer of components (A) and (B), and (D) an organophosphorus compound serving as a curing accelerator for components (A) and (B), wherein the organophosphorus compound is employed at a weight ratio of from 0.0001 through 0.1 with respect to the weight of the polymer of components (A) and (B).