| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition useful for e.g. prepregs with low hygroscopicity and excellent dielectric properties by including a specific novolak- type epoxy resin, a curing agent and a specific polyamide-butadiene-acrylonitrile copolymer. SOLUTION: This epoxy resin composition is obtained by including (A) a novolak-type epoxy resin having both phenol skeleton and naphthol skeleton, (B) a curing agent (e.g. phthalic anhydride) and (C) a phenolic hydroxyl group- contg. polyamide-butadiene-acrylonitrile copolymer, wherein the amount of the component B to be used is pref. 0.3-2.0 in terms of the equivalent ratio to the epoxy group in the component A and that of the component C is pref. 10-90 wt.% based on the whole composition. By the way, the component C is obtained, for example, by the following process: a diamine is added to a phenolic hydroxyl group-contg. dicarboxylic acid followed by conducting a condensation reaction in the presence of a phosphorous ester and a pyridine derivative and then carrying out a polycondensation between the reaction product and a polybutadiene-acrylonitrile copolymer respectively having carboxyl groups on both the terminals.
|
