Patent ID: 9206308
Filing Date: 2015-12-08
Classification: C08G,C08J,C08K,C08L,H05K

Abstract:
1. An epoxy resin composition for a prepreg obtained by blending a pre-reacted epoxy resin, an epoxy resin which is not pre-reacted, a hardening agent, an inorganic filler, and a molybdenum compound, wherein: the pre-reacted epoxy resin is obtained by reacting a phosphorus compound with (i) a bifunctional epoxy resin and a multi-functional epoxy resin, or (ii) the bifunctional epoxy resin only, in advance, the epoxy resin which is not pre-reacted is a bifunctional epoxy resin or a multi-functional epoxy resin when the pre-reacted epoxy resin is obtained by reacting the phosphorus compound with (i), the epoxy resin which is not pre-reacted is a multi-functional epoxy resin when the pre-reacted epoxy resin is obtained by reacting the phosphorus compound with (ii), the phosphorus compound has 1.8 or more and less than 3 on average of a phenolic hydroxyl group that is reactive to an epoxy resin in the molecule, and that has 0.8 or more on average of a phosphorus element, the bifunctional epoxy resins have 1.8 or more and less than 2.6 on average of epoxy groups in the molecule, the multi-functional epoxy resins contain 2.8 or more on average of epoxy groups in one molecule, and the inorganic filler is used in a blending amount of 110 parts or more by mass and less than 200 parts by mass with respect to 100 parts by mass total of the pre-reacted epoxy resin and the epoxy resin which is not pre-reacted.