Mitsubishi Rayon Company, Limited

Koki Wakabayashi

Kazutami Mitani

Yasuo Takagi

Akihiro Ito

Takashi Kaneko

Kazuya Goto

Shigetsugu Hayashi

Tadayoshi Saito

Hisao Koba

Shirou Asada

Kimihiro Ikezaki

A reinforced-fiber sheet impregnated with a matrix resin, a protective film having an irregular surface is applied to at least one surface of the reinforced-fiber sheet impregnated with the matrix resin such that the irregular surface faces the reinforced-fiber sheet. The thus-formed reinforced-fiber sheet covered with a protective film is kept at a temperature of 50-130&#xb0; C. for four hours or more such that the viscosity of the impregnated resin is 100-10000 poise.

Prepreg and method of manufacturing the prepreg

Epoxy resin compositions comprising (a) an epoxy resin, (b) a latent curing agent with curing power at 100&#xb0; C. or below and (c) an aromatic amine-based curing agent and/or an alicyclic amine-based curing agent, which are curable in two stages, or epoxy resin compositions further comprising (d) a curing accelerator, as well as a prepregs comprising reinforcing fiber materials impregnated with the epoxy resin compositions. The compositions give die-releasable cured products by primary curing at low temperature, give highly heat-resistant cured products by secondary curing, and exhibit satisfactory stability at room temperature.

Epoxy resin composition and prepreg made with the epoxy resin composition

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Aichi, Japan

Koki Wakabayashi