Mitsubishi Rayon Company, Limited

Masahiro Saruta

Hisashi Tada

Akira Agata

Takashi Murata

Hiroyuki Ikeda

Suehiro Tayama

Masahiro Sugimori

Kazuya Goto

Hideki Moriishi

Takatoshi Kubo

Michitoshi Shinka

Setuo Kashiyama

Tetuya Sawano

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

A monomer comprising methyl methacrylate either alone or in combination with another acrylic or methacrylic ester monomer is partially polymerized to prepare a syrup, to which an initiator including a peroxide having a 10-hour half-life temperature of 50.degree. to 58.degree. C. and 2,2'-azobisisobutyronitrile are added. The resulting syrup, after being poured into a mold, is initially polymerized in a first step at a temperature of 75.degree. to 90.degree. C. for a period of 5 to 15 minutes, then further polymerized in a second step at a temperature 3.degree. to 12.degree. C. lower than the temperature of the first step polymerization until a conversion of monomer to polymer of 80 to 95% is attained. The polymerization product which is now in the form of a sheet is then heat-treated at a temperature of 95.degree. to 140.degree. C. to obtain a methacrylic resin sheet. According to this process, methacrylic resin sheets having little residual monomer and being substantially free of defects can be manufactured with high productivity.

Process for the production of methacrylic resin sheets

Epoxy resin composition

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

Epoxy resin composition and prepreg for composite materials using the

Carbon fiber for composite material

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

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Hiroshima, Japan

Masahiro Saruta