Patent ID: 6812299
Filing Date: 2004-11-02
Classification: C08F,C08G,C08L,H01L,H05K,Y10T

Abstract:
A thermosetting resin composition comprising (I) 100 parts by weight of an adduct of an epoxy resin with an unsaturated aliphatic acid, the unsaturated aliphatic acid being added to 20%-80% of epoxy groups in the epoxy resin, (II) 50 to 300 parts by weight of a (meth) acrylate, (III) 5 to 20 parts by weight of a radical polymerization initiator, (IV) 50 to 200 parts by weight of a crystallizable epoxy resin, and (V) 5 to 30 parts by weight of a latent curing agent, capable of a primary curing reaction at a primary curing reaction starting temperature, and a secondary curing reaction at a temperature of 150 to 200Â° C., wherein the melting point of component (IV) is in a range of 80 to 110Â° C. which is lower than the primary curing reaction starting temperature and the viscosity of component (IV) when above its melting point is below 50 (mPaÂ·s).