Patent ID: 6780674
Filing Date: 2004-08-24
Classification: C08G,C08L,H01L,Y10T

Abstract:
A liquid epoxy resin composition comprising a liquid epoxy resin, a curing agent, a curing accelerator, and an inorganic filler as essential components,said liquid epoxy resin comprising a mixture of (a) an epoxy resin containing two or less epoxy functional groups in a molecule and being liquid at normal temperature and (b) an epoxy resin containing two or more epoxy functional groups in a molecule and being solid at normal temperature in a weight ratio of epoxy resin (a)/epoxy resin (b) of from 9/1 to 1/4, said solid epoxy resin (b) being selected from epoxy resins of the following general formulae (1) to (4) and combinations thereof: wherein R is independently hydrogen, C1-C4 alkyl or phenyl, and x is 0 to 10, wherein R1 is hydrogen or a monovalent hydrocarbon group of 1 to 6 carbon atoms, R1 is hydrogen, methyl or ethyl, and y is an integer of 0 to 6, wherein z is an integer of at least 1, wherein R1 to R4 are each independently hydrogen or a monovalent hydrocarbon group of 1 to 6 carbon atoms,said epoxy resin mixture having a viscosity of up to 10,000 poises at 25Â° C. as measured by an E type viscometer, the composition having a toughness K1c of at least 3.0.