Patent ID: 7179552

Claim:
A resin composition, comprising: (A) an epoxy resin having 2 or more epoxy group in one molecule and which exists in a liquid state at a temperature of 20° C.; (B) an aromatic epoxy resin having 3 or more epoxy groups in one molecule and an epoxy equivalent of 200 or less; (C) a phenol type curing agent; (D) one or more resins selected from the group consisting of a phenoxy resin, a polyvinyl acetal resin, a polyamide resin, a polyamideimide resin, and mixtures thereof, and having a glass transition temperature of 100° C. or more; and (E) an inorganic filler, wherein: said inorganic filler (E) is present in an amount of 35% by weight or more based on the total weight of non-volatile components of said resin composition; said epoxy resin (A) and said aromatic epoxy resin (B) are present in a weight ratio of from 1:0.3 to 1:2 of said epoxy resin (A) to said aromatic epoxy resin (B); said phenol type curing agent (C) is present in an amount such that the ratio of total epoxy groups in said resin composition and phenolic hydroxyl groups in said phenol type curing agent (C) is from 1:0.5 to 1:1.5; and said resin (D) is present in an amount of from 2 to 20% by weight based on the total weight of non-volatile components of said resin composition.