Toray Industries, Inc.

Ayumi Matsuda

Noriyuki Hirano

Kenichi Yoshioka

Jun Misumi

Masayuki Miyoshi

Takayuki Fujiwara

Shiori Kawamoto

Shinji Kochi

Yumi Kunimitsu

An epoxy resin composition is provided including at least the following component [A], component [B], and component [C] or [D] wherein cured product obtained by curing the epoxy resin composition has a rubbery state modulus in dynamic viscoelasticity evaluation of 10 MPa or less, and the cured product has a glass transition temperature of at least 95&#xb0; C.;

Epoxy resin composition and fiber reinforced composite material

A prepreg containing components (A) to (C) defined below, wherein component (A) is placed on one surface or both surfaces of a layer comprising components (B) and (C), 90% or more by area of component (A) being present in a region(s) extending from the surface(s) of the resulting prepreg containing components (A) to (C) to a depth equal to 20% of the average thickness of the prepreg: (A) urethane particles having tan &#x3b4; of 0.15 or more at 10&#xb0; C. and having a three-dimensional cross-linked structure, (B) a first epoxy resin composition, and (C) reinforcing fiber. The present invention provides a fiber-reinforced composite material which excels in rigidity, strength, and vibration damping properties, and a prepreg which is suitably used for production thereof, and also provides methods for production thereof.

Prepreg, fiber-reinforced composite material, and method for producing prepreg

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Ehime, Japan

Ayumi Matsuda