Mitsubishi Rayon Company, Limited

Shigetsugu Hayashi

Hisashi Tada

Takashi Murata

Masahiro Sugimori

Kazuya Goto

Yasuo Takagi

Takashi Kaneko

Kazutami Mitani

Takeshi Kato

Yoshinobu Shiraishi

Toshikazu Aoki

Toshihiro Hattori

Tadayoshi Saito

Yasushi Suzumura

Mikio Takasu

Koki Wakabayashi

Tomowo Sano

Tadashi Yokochi

Hideo Konishi

Masayuki Fukumoto

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

The present invention relates to a repair and reinforcement method for preexisting structures such as buildings or the like, and in particular, relates to a repair and reinforcement method for concrete structures, and to an anisotropic textile employed in this method. The present invention provides a method which permits execution even in low temperature conditions, and which moreover exhibits superior repair and reinforcement effects in a short period of time; during the impregnation of a resin into a sheet material comprising reinforcement fibers and the curing of this resin to form a fiber-reinforced resin layer which is used in the repair and reinforcement of preexisting structures, a reactive mixture having a gelling period of 15 minutes or more at a temperature of 20&deg; C. and which polymerizes even at 5&deg; C. and is curable within 6 hours, and which has as chief components thereof a monomer containing vinyl groups and a reactive oligomer having vinyl groups and/or a thermoplastic polymer, is employed as the resin. Furthermore, the present invention provides an anisotropic textile for use in the repair and reinforcement of preexisting structures.

Method of repairing/reinforcing existing structures and anisotropic woven fabrics used therefor

A prepreg for fiber-reinforced composite materials comprising (A) a reinforcing fiber having a modulus of elasticity of 200 GPa or more, (B) a fibrous thermoplastic resin having a modulus of elasticity of 100 GPa or less, and (C) a thermosetting matrix resin. The prepreg of the present invention does not only have excellent handling property equivalent to that of the prepreg with the conventional thermosetting resin as a matrix, but also gives excellent toughness to the resulting molded product without injuring the thermal and mechanical properties. Particularly, it has a high resistance to interlaminar fracture when exposed to impact, so that it is preferably used as a structural material for airplanes, etc.

Prepregs, process for producing the same and laminates produced with the

Resin composition for composite material

A resin composition for composites which comprises as essential components

An epoxy resin composition is disclosed that can be cured at a temperature of 150.degree. C. or below, and can be used to provide a high performance carbon fiber composite material having a 0.degree. direction bending strength of 220 kg/mm.sup.2 or over, and an interlayer shear strength of 10 kg/mm.sup.2 or over. The composition is made up of:

Epoxy resin composition for composite material from m- or o-substituted

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Nagoya, Japan

Shigetsugu Hayashi