Seikosha Co., Ltd.

Mitsubishi Gas Chemical Company, Inc.

Kabushiki Kaisha Bridgestone

Kouji Hirose

Noriyuki Kato

Toshio Shimizu

Munenori Shiratake

Takashi Ishii

Yoshio Nishimura

Hirohito Ishizuka

Hitoshi Ito

Kentarou Ishihara

Kazuhito Yoshida

The polycarbonate resin of the present invention has a structural unit represented by general formula (A): (in formula (A), X is an alkylene group having 1 to 4 carbon atoms).

Polycarbonate resin, production method therefor, and optical molded body

Semi-circular cover membersandhaving a spring function for opening and closing the openings of poresS are provided on the cavity inner wall side of a porous air ventin order to close the openings of the above poresS while a small space remains between the above cover membersandand the openings of the poresS of the porous air vent during vulcanization, whereby the occurrence of the occlusion of the above poresS is reduced and stains adhered to the cavity inner wall side of the moldare removed by physical means such as a blast treatment while the above cover membersandare closed at the time of cleaning to remove the stains of the above mold. Further, the above openings are opened as required to allow a cleaning liquidgo into the above poresS to clean the above moldand remove stains in the poresS.

Rubber molded article vulcanizing mold, and method for cleaning the same

An article having a colored surface comprises an article having a working surface and a coating applied on the working surface comprising a cermet composed of alumina and one of chromium and nichrome and exhibiting a black silver color.

Article of black silver color

A colored article comprises a workpiece having a surface producing a color by light interference. The surface is defined by forming a reflective surface and coating the reflective surface with a composite layer of SiC and SiO.sub.2 having an SiO.sub.2 ingredient ratio of 5 to 80% by weight and a thickness of 200 to 3000 .ANG. or with a composite layer of Si.sub.3 N.sub.4 and SiO.sub.2 having an SiO.sub.2 ingredient ratio of 5 to 80% by weight and a thickness of 400 to 4000 .ANG..

Colored articles with interference layers made of a composite of silicon

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Tokyo, Japan

Kouji Hirose