EPOXY RESIN COMPOSITION, EPOXY RESIN VARNISH, EPOXY RESIN PREPREG AND MULTILAYER PRINTED WIRING BOARD MADE BY USING THIS EPOXY RESIN PREPREG AS PREPREG FOR BONDING

摘要

PROBLEM TO BE SOLVED: To improve the resin flow when a large quantity of an inorginic filler such as barium titanate is blended with a resin composition comprising a blend of an epoxy resin and a phenol adduct of a diene polymer. SOLUTION: The essential components used comprise 100 pts.wt. resin component consisting of an epoxy resin, a phenol adduct of a diene polymer and a cure accelerator, 180-250 pts.wt. inorganic filler having a relative permittivity of at least 10, and a titanate coupling agent in an amount of 0.1-0.6 pt.wt. based on 100 pts.wt. of the inorganic filler. The solvent used for making the varnish comprises a mixture of at least one solvent having a boiling point of 50-90 deg.C and at least one solvent having a boiling point of 110-160 deg.C.