Mitsubishi Rayon Company, Limited

Mitsubishi Heavy Industries Limited

Hisashi Tada

Takashi Murata

Akira Agata

Masahiro Saruta

Shigetsugu Hayashi

Yoshinobu Shiraishi

Masahiro Sugimori

Kazuya Goto

Tetsuya Yamamoto

Takayuki Iseki

Takeshi Kato

Hajime Asai

Yasuaki Ii

Takeo Gomi

Toshihiro Hattori

Tetsuya Sawano

Hideki Moriishi

Takatoshi Kubo

Setsuo Kashiyama

Shigeru Sakai

Naonori Yoshioka

Setuo Kashiyama

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

The present invention provides expandable plastics having a molecular weight of 50,000 to 500,000 which comprises the following structural units (I), (II) and (III) giving a foam having heat resistance and fine structure by heating, the molar ratio of (I+II) to (III) being 1 to 0.6-1.5 and the proportion of (I) being 5 to 50 wt. % of the total components: ##STR1## wherein R represents a hydrogen atom or a methyl group. When the copolymer, the expandable plastics, of the present invention is used, white foams having a very fine texture are obtained without using special foaming agents, and besides the heat resistance of the foams is high and the amount of water absorbed thereby is little. The foams of the present invention, therefore, can be used in a wide range as soundproofing materials and heat insulators for which the conventional foams cannot be used because of their low heat resistance, and substitutes for honeycomb structures used in airplanes.

Expandable plastics and their foams

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

Resin composition for composite material

A resin composition for composites which comprises as essential components

An epoxy resin composition for use in carbon fiber reinforced plastics which comprises the following components (A), (B), (C), and (D):

Epoxy resin composition for use in carbon fiber reinforced plastics,

Epoxy resin composition

An intermediate for a composite material is described, comprising a reinforcing material impregnated with a resin composition which comprises: (A) 100 parts by weight of a mixture of (I) a polyfunctional maleimide and (II) a polyfunctional cyanate or an oligomer thereof, or a preliminary reaction product of (I) and (II); (B) from 5 to 100 parts by weight of an epoxy compound; and (C) from 5 to 50 parts by weight of a polyester compound.

Intermediate for composite of polymaleimide, polycyanate, epoxy resin

An epoxy resin composition is disclosed, which comprises the following elements:

Epoxy resin composition and prepreg for composite materials using the

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

Carbon fiber for composite material

An intermediate for a composite material is disclosed. The intermediate is obtained by impregnating an epoxy resin composition containing a specific additive into a carbon fiber. The composite material obtained from the intermediate has improved mechanical properties.

Intermediate for composite materials

A resin composition comprising (I) at least one compound selected from the group consisting of hydroxyl-containing unsaturated polyesters, reaction products of polyepoxides and ethylenically unsaturated carboxylic acids and .beta.-polymers of diallyl phthalate (II) at least one monomer copolymerizable with said compound (I), which is selected from the group consisting of ethylenically unsaturated monomers and allylic unsaturated monomers, (III) a catalyst capable of polymerizing (I) and (II), (IV) at least one compound containing the oxirane ring, (V) a curing agent (excluding acid anhydrides, acids and amine compounds) capable of curing said compound (IV), and (VI) a catalyst capable of promoting the curing of (IV) by (V). A preferable composition further contains (VII) a polyisocyanate compound and (VIII) a promoter for the reaction between isocyanate group and hydroxyl group. The composition may contain fibrous reinforcing agents.

Resin composition

A non-solvent type thermosetting resin film exhibiting excellent uniformity in thickness is prepared by a process wherein a molten thermosetting resin composition having a curing agent incorporated therein is extruded through a linear slit of a flat die, maintained at a constant temperature, onto a release sheet continuously moving at a constant rate in close proximity to the exit end of the linear slit. As the flat die a flat sheeting die having a substantially circular manifold is used and the molten thermosetting resin is extruded onto the release sheet, which is supported by a back-up roll and confronts the exit end of the linear slit of the flat sheeting die.

Process for producing thermosetting resin film

A fiber-reinforced plastic sheet molding compound comprising a sheet member (A) formed of a resin composition which consists of 30 to 90% by weight of a reinforcing cut fiber and 70 to 10% by weight of a matrix resin, at least one surface of said sheet member (A) being intimately applied to a sheet member (B) which is formed of the matrix resin and which has a thickness thinner than that of sheet member (A).

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Nagoya, Japan

Hisashi Tada