PURPOSE: To obtain a heat-resistant laminate at a low cost by impregnating a fibrous substance with a composition containing an epoxy resin, a novolak resin, and an epoxy-curing agent of heat-curing type, which is heated to give a semi- cured prepreg, followed by hot-pressing the prepreg.
CONSTITUTION: An epoxy resin (A) (e.g. a bisphenol A type epoxy resin), a novolak resin (B) (e.g. a phenol novolak resin or an orthocresol novolak resin) in an amount to give 0.1W0.95 phenolic hydroxyl group per epoxy group of component A, and an epoxy-curing agent of heat-curing type (e.g. dicyandiamide) (C) are mixed. A fibrous substance (e.g. a glass cloth) is impregnated with this composition, which is heated to give a semi-cured prepreg. Then a required number of the prepreg sheets are laid and hot-pressed to give an objective heat-resistant laminate.
HARAGUCHI SATORU
ADACHI TERUHO
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