Toho Tenax Co., Ltd.

Hiroshi Numata

Yoshinori Suzuki

Toru Kaneko

Takaya Suzuki

Toyoaki Ishiwata

Yasuyuki Yokoe

Takeshi Shimada

The present invention provides a prepreg comprising: a primary pre-pregnant made of a reinforced fiber substrate and an epoxy resin composition containing at least epoxy resin and thermoplastic resin impregnated into the reinforcing fiber that forms the reinforced fiber substrate; and a surface layer made of epoxy resin composition containing at least an epoxy resin and an epoxy resin-soluble thermoplastic resin that dissolves in the epoxy resin, the surface layer being formed on one or both surfaces of the primary prepreg; the prepreg being characterized in that only one of either the epoxy resin composition of the primary prepreg or the epoxy resin composition of the surface layer contains a hardening agent for an epoxy resin.

Prepreg and method for manufacturing same

The present invention discloses a resin composition and a prepreg produced using the resin composition. The resin composition comprises, as essential components: 100 parts by mass of a component (A) which is an epoxy resin; 41 to 80 parts by mass of a component (B) which is thermoplastic resin particles; and 20 to 50 parts by mass (in terms of diaminodiphenylsulfone) of a component (C) which is diaminodiphenylsulfone microencapsulated with a coating agent. The thermoplastic resin particles (B) comprise at least thermoplastic resin particles (B) having an average particle diameter of 1 to 50 &#x3bc;m and thermoplastic resin particles (B) having an average particle diameter of 2 to 100 &#x3bc;m at a mass ratio of 3:1 to 1:3. The average particle diameter ratio D/Dof the average particle diameter Dof the thermoplastic resin particles (B) to the average particle diameter Dof the thermoplastic resin particles (B) is 2 or more.

Resin composition, and prepreg

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Shizuoka, Japan

Hiroshi Numata