Sumitomo Rubber Industries Limited

Kao Corporation

Other

Nitto-denko Corporation

Fuji Latex Co., Ltd.

Shinichi Nakade

Toshiaki Sakaki

Yasuyuki Tanaka

Masaharu Hayashi

Atsuko Kawasaki

Eiji Kanamaru

Akihito Kuga

Kenichi Ikeda

Tetsuo Yamaguchi

Akihiro Nakahara

Masaru Kohno

Kunio Niwa

Kazuhiko Shibata

Atsuko Ochi

Makoto Sakuraoka

Yuji Nishida

Kazuhiro Sekiguchi

Tomoko Noyama

Tetuo Morita

Michihiro Tanaka

Kimihiro Tanida

A process is disclosed, by which protein can be removed easily and efficiently from natural rubber latex so that deproteinized natural rubber latex can be produced with high productivity and low cost. Particularly, a process for the production of deproteinized natural rubber latex is disclosed, which comprises treating natural rubber latex with a proteolytic enzyme and a surfactant to decompose protein in natural rubber latex, washing the treated natural rubber latex in the presence of a salt. According to the process, deproteinized natural rubber latex useful as a counter-allergy material having stable qualities can be produced easily with high productivity and low cost.

Process for producing deproteinized natural rubber latex

Process for preparing deproteinized natural rubber latex molding and

This invention presents a rubber composition wherein a determined amount of protein is mixed with unvulcanized rubber. Rubber products made of this rubber composition have sufficient strength for practical use and are harmless to human bodies. The rubber composition of the invention not requiring vulcanizing process is advantageous in eliminating the need of large-scale vulcanizing equipment. Combined use of a curing agent and protein will increase modulus higher than using the curing agent alone.

Rubber composition and method of producing rubber products using the

There are provided a deproteinized natural rubber latex which comprises a purified product of proteolytically treated natural rubber latex and contains fine particles of natural rubber latex, a deproteinized natural rubber which comprises a dehydrated product of the deproteinized natural rubber latex, and a process for the production of deproteinized natural rubber latex which comprises subjecting a latex solution prepared by (1) adding water and/or a surfactant to a natural rubber latex and then proteolytically treating the resulting latex solution or (2) proteolytically treating a natural rubber latex and then adding water and/or a surfactant to the treated natural rubber latex, to purification using a rotary plate membrane separation apparatus. The deproteinized natural rubber latex contains substantially no protein, is excellent in film-forming property, and provides a raw rubber film having excellent green strength, and the process can produce the deproteinized natural rubber latex in a high yield with high production efficiency.

Deproteinized natural rubber latex and its production process

A method for forming a shock resistant tool comprising reinforcing fiber used as a reinforcing material and cyclopentadiene resin used as matrix resin by reaction injection molding method. Cyclopentadiene resin is superior in shock resistant performance and has a low melt viscosity, thus allowing fiber to be contained in the shock resistant tool at a high percentage.

Method of making a shock resistant tool comprising a fiber reinforced

A material for making marine structure comprises a rubber composition. The rubber composition contains a metal salt of .alpha., .beta.-unsaturated fatty acid and is vulcanized in a mold into a predetermined configuration. The strength of the rubber composition is anisotropic and in particular its elastic modulus is anisotropic. The direction in which the strength of the rubber composition is high is set in the direction in which stress is applied by waves. Thus, the marine-structural material is resistant to waves and tide. The rubber composition contains short fibers which are oriented in a certain direction to increase the anisotropy of the rubber composition.

Material for making marine structure

A golf ball having an improved low temperature impact resistance, which comprises a core and a cover made of a cover composition containing an ionic copolymer having at least two different metal ions in one molecule. The cover composition is prepared by kneading a sodium ion type ionic copolymer having free carboxyl groups and a metal oxide such as magnesium or zinc oxide at high temperatures, whereby the metal oxide is reacted with the ionic copolymer to incorporate the metal ion such as magnesium or zinc ion into the ionic copolymer.

Golf ball

This invention is intended to provide a golf ball having good shot feeling and click properties, which is produced by impregnating a rubber thread-wound core with a latex containing within the range of 30 to 60% by weight the solid content of an Ionomer resin of ion-crosslinkages comprising mono-olefin and at least one unsaturated monocarboxylic or dicarboxylic acid or acid ester of three to eight carbon atoms, thereby to improve the integration between the core and the inner surface of the ball shell made of Ionomer resin of ion-crosslinkages to be covered over the latex covered core.

Thread wound golf ball

Growing community of inventors

Hyogo, Japan

Shinichi Nakade