Other

Showa Highpolymer Co., Ltd.

Showa Denko K.k.

Kazuo Ohtani

Shuichi Sugita

Hirotoshi Kamata

Tomio Yamamoto

Hidetake Sendai

Toshiaki Hanyuda

Norio Shinohara

Takeo Watanabe

Jouji Shibata

Kojiro Mori

Toshihiko Kadota

Nobumasa Inoue

Norio Akai

Curable composite material composition and curing process therefor

Photocurable prepreg sheet for waterproofing, method and apparatus for production of prepreg sheet, and waterproofing method using the sheet

A photocurable prepreg composition which is characterized by easy control of a B stage state of a thermosetting resin such as an unsaturated polyester resin or an epoxy acrylate resin, excellent storage stability, and remarkable curability after being shaped; as well as a production method therefor. A photocurable prepreg composition which contains an unsaturated polyester resin and/or an epoxy acrylate resin; at least two photopolymerization initiators with photosensitivity in different wavelength ranges; and an inorganic or an organic fiber-reinforcing material and/or filler, and which composition is treated with light of a specific wavelength such that at least one photopolymerization initiator and radical-polymerizable unsaturated groups remain partially in said resin; a production method therefor; and formed articles produced therefrom.

Photocurable prepreg composition and production method thereof

Curable resin composition comprising a compound (A) having one or more maleimide groups within the molecule thereof, and vinlbenzyl compound (B) obtained by reacting amines with halomethylstyrene in the presence of alkali. The composition exhibits excellent low-temperature curability, heat resistance and mechanical strength.

Curable resin composition

A thermoset resin composition comprises a compound (A) having one or more maleimido groups in its molecule and at least one vinylbenzyl ether compound (B) selected from the group consisting of compounds (B.sub.1) having at least two vinylbenzyl ether groups bonded to a naphthalene nucleus in its molecule and compounds (B.sub.2) having at least two vinylbenzyl ether groups bonded to a benzene nucleus having at least one substituent selected from the group consisting of hydroxyl groups, alkyl groups and alkoxy groups in its molecule. The composition exhibits excellent low-temperature curing properties, heat resistance and mechanical strength.

Thermoset resin composition

A curable composition for a fiber-reinforced resin, comprises (A) 60-90 weight % of an epoxy-containing (meth)acrylate resin which contains an epoxy group and an unsaturated-monobasic acid ester group in its molecules and which is formed by the reaction of an epoxy resin containing at least two epoxy groups per molecule and having an epoxy equivalent of 100-1000 with an unsaturated-monobasic acid in an amount such that there are 0.2-0.7 equivalents of carboxyl groups per 1 equivalent of epoxy groups, (B) 40-10 weight % of a radical polymerizable monomer, (C) an organic peroxide, (D) a curing agent for the epoxy resin, and (E) one or more reinforcing materials selected from continuous fiber and fiber cloth.

Curable composition for a fiber-reinforced resin

The invention relates to a device for preventing a turntable for a record player from slipping off a shaft rotatably extending through a boss made of a metal fixed to the turntable. The turntable has integrally formed therewith slot means for receiving two bent ends of leg portions of a generally U-shaped retainer spring and a plurality of support projections. With the slot means and the plurality of support projections, the retainer spring is mounted to the turntable such that the leg portions thereof extend substantially in parallel to each other and across a circular axial end of the boss. The shaft is formed with a radial groove to receive the leg portions of the retainer spring. The plurality of support projections will serve as a spacer to keep the leg portions apart to prevent interference contact bwtween the leg portions and a bottom wall of the radial groove which otherwise would hamper smooth rotation of a turntable.

Device for preventing slipping of turntable out of shaft

Growing community of inventors

Kumagaya, Japan

Kazuo Ohtani