Mitsubishi Rayon Company, Limited

Hisao Koba

Akihiro Ito

Kazutami Mitani

Masato Taguchi

Koki Wakabayashi

Kimihiro Ikezaki

Shirou Asada

Yutaka Yamaguchi

Masato Mitsubishi Rayon Co Ltd Taguchi

Yutaka Mitsubishi Rayon Co Ltd Yamaguchi

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

An epoxy resin composition giving a cured resin plate which, after 60 hour standing at 150&deg; C. and at the saturated vapor pressure, has a water absorption of 3.5% by weight or lower; a prepreg which comprises the epoxy resin composition and reinforcing fibers; and a fiber-reinforced resin roll which is 1) a laminate comprising fiber-reinforced resin layers each comprising reinforcing fibers and a matrix resin, wherein the matrix resin is a resin composition giving a cured resin plate which, after 60 hour standing at 150&deg; C. and at the saturated vapor pressure, has a water absorption of 3.5% by weight or lower; or 2) a laminate comprising (i) at least one fiber-reinforced resin layer comprising long reinforcing fibers having an elastic modulus of 600&tilde;800 Gpa and a resin composition and (ii) at least one fiber-reinforced resin layer comprising long reinforcing fibers having an elastic modulus of 140&tilde;300 Gpa and a resin composition.

Epoxy resin composition, prepreg, and roll made of resin reinforced with reinforcing fibers

Growing community of inventors

Aichi, Japan

Hisao Koba