Mitsubishi Rayon Company, Limited

Kazuya Goto

Akihiro Ito

Tsuneo Takano

Kazuki Koga

Masato Taguchi

Kiharu Numata

Junichi Muramatsu

Tadashi Sakai

Akitada Yanase

Hisashi Tada

Masahiro Sugimori

Kazutami Mitani

Shigetsugu Hayashi

Yasuo Takagi

Takashi Kaneko

Takeshi Kato

Takashi Murata

Masahiro Saruta

Tadayoshi Saitou

Tadayoshi Saito

Toshihiro Hattori

Koki Wakabayashi

Kouki Wakabayashi

The invention relates to a prepreg containing a reinforcing fiber, a sheet-like reinforcing fiber substrate including the reinforcing fiber, and a matrix resin, wherein the matrix resin is impregnated into the sheet-like reinforcing fiber substrate and also covers one surface of the sheet-like reinforcing fiber substrate, such that the matrix resin impregnation ratio is within a range of 35% to 95%. The invention also relates to a prepreg containing a reinforcing fiber substrate in the form of a sheet and formed from a reinforcing fiber woven fabric, and a matrix resin, wherein at least one surface of the reinforcing fiber substrate displays a sea-and-island-type pattern with resin-impregnated portions (island portions) and fiber portions (sea portions), such that a surface coverage of the matrix resin is within a range of 3% to 80%.

Prepreg, intermediate material for forming FRP, and method for production thereof and method for production of fiber-reinforced composite material

An epoxy resin composition suitably used for a prepreg which can complete curing in a short time even at a low temperature and secure a sufficient usable period under preservation at room temperature, in comparison with conventional epoxy resin compositions. An epoxy resin composition comprising at least one of an epoxy resin, an amine compound having at least one sulfur atom in the molecule thereof, and a reaction product of an epoxy resin and an amine compound having at least one sulfur atom in the molecule thereof, and an amine compound having at least one sulfur atom in the molecule thereof, and a urea compound and a dicyandiamide, wherein each of the contents of the sulfur atom and the urea compound in the epoxy resin composition is respectively 0.2 to 7% by mass and 1 to 15% by mass.

Epoxy resin for prepreg, prepreg, and fiber-reinforced composite material and methods for production thereof

Epdxy resin for prepreg, prepreg, fiber-reinforced composite material, and methods for production thereof

Epoxy resin for prepreg, prepreg, fiber-reinforced composite material and methods for production thereof

A method for producing a fiber-reinforced composite material plate by heating and pressurizing a prepreg for a molding time of 15 minutes or less, at a molding temperature of at least 120&#xb0; C. and a molding pressure of at least 10 kg/cm. The prepreg is prepared from a reinforcing fiber and an epoxy resin composition. The epoxy resin composition features: an epoxy resin; an amine compound having at least one sulfur atom in the molecule thereof and/or a reaction product of the epoxy resin and the amine compound having at least one sulfur atom in the molecule thereof; a urea compound; and a dicyandiamide. The contents of the sulfur atom and the urea compound in the epoxy resin composition are respectively 0.2 to 7% by mass and 1 to 15% by mass.

Method for producing a fiber-reinforced composite material plate

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

A preform can be molded by resin transfer molding and yields a composite material having excellent strength and excellent interlaminar debonding resistance. The preform, which is for producing a fiber-reinforced composite, comprises layers of laminated structure of a reinforcing material comprising reinforcement fibers and has, between these layers, a layer comprising a thermoplastic resin and having space so as not to inhibit a liquid resin from flowing therethrough. The preform is molded to yield a fiber-reinforced composite material.

Preform for composite material and composite material

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

An epoxy resin composition used as a matrix for a fiber-reinforced composite is disclosed, which comprises the following components:

Dihydroxybiphenyl-advanced epoxy resin blends

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Irvine, CA, United States of America

Kazuya Goto