EPOXY RESIN COMPOSITION, PREPREG USING THE EPOXY RESIN COMPOSITION, METAL-CLAD LAMINATE, AND PRINTED WIRING BOARD

摘要

Disclosed is an epoxy resin composition essentially containing an epoxy compound, a low-molecular-weight phenol-modified polyphenylene ether and a cyanate compound. This epoxy resin composition is excellent in dielectric characteristics and exhibits high heat resistance, while maintaining flame retardancy. Specifically disclosed is an epoxy resin composition which is a thermosetting resin composition composed of a resin varnish containing an epoxy compound (A) having a number average molecular weight of not more than 1000 and containing at least two epoxy groups in a molecule without containing a halogen atom, a polyphenylene ether (B) having a number average molecular weight of not more than 5000, a cyanate ester compound (C), a curing catalyst (D) and a halogen flame retardant (E). This epoxy resin composition is characterized in that the components (A)-(C) are dissolved in the resin varnish, while the component (E) is not dissolved but dispersed in the resin varnish.