Daikin Industries, Ltd.

Daikin Kogyo Co., Ltd.

Kabushiki Kaisha Daikyo Gomu Suki

Kiyohiko Ihara

Tsuneo Nakagawa

Shinichi Nakagawa

Fumihiko Yamaguchi

Tetsuo Shimizu

Nobuyuki Tomihashi

Akira Ohmori

Kazutaka Hosokawa

Toshio Miyatani

Toshihiko Amano

Toshio Mizuno

Kazuhiro Nakai

Katsuhide Otani

Yutaka Nakata

Kohzoh Asano

Shinichi Yamane

Yoshiki Maruya

Mitsugu Omori

Sadaatsu Yamaguchi

Toshio Sogabe

Katsuhide Ontani

Yoshihisa Noda

The fine powder of high molecular weight fluorine containing resins having melt viscosities of 10 to 10 poise, apparent density of 0.4 to 1.5 g/cc, and specific surface area of 2 m /g or less, mold goods of the fine powder and these production methods. By utilizing the fine powder of high molecular weight flourine containing fused resins that have previously not been employed, the mold goods obtained from the fine powder have fewer liquated particles and have become the most suitable especially for manufacturing semiconductors. The powder's products have greater resistance to flex fatigue, abrasion, resistance, etc.

Fine powder of high molecular weight fluorine containing fused resins, its mold goods, and the dedicated production methods

Process for preparing low molecular weight polytetrafluoroethylene

Colloidal polytetrafluoroethylene fine particles having an average particle size of 0.05 to 1.0 .mu.m and each comprising a core made of polytetrafluoroethylene which has a high molecular weight and can be fibrilled and a shell surrounding the core and made of a low molecular weight polytetrafluoroethylene which is not fibrilled, which has good dispersibility in water or an organic solvent and easily provides an organosol by a phase transfer method.

Polytetrafluoroethylene fine particles and powder

A copolymer comprising chlorotrifluoroethylene and 0.01 to 1% by mole of perfluoro(alkyl vinyl ether) of the formula:

Chlorotrifluoroethylene/perfluoro(alkyl vinyl ether) copolymer

A copolymer of tetrafluoroethylene and a perfluoro(alkyl vinyl ether) having the formula (I):

Tetrafluoroethylene copolymer and process for preparing the same

A method for producing a fluorine-containing olefin represented by formula (I):

Method for producing fluorine-containing olefin

A copolymer comprising monomeric units derived from ethylene, tetrafluoroethylene and a fluorine-containing vinyl monomer which provides the copolymer with side chains having at least one carbon atom, wherein the molar ratio of tetrafluoroethylene and ethylene is from 62:38 to 90:10 and the content of the fluorine-containing vinyl monomer is from 0.1 to 10% by mole based on the total number of mole of ethylene and tetrafluoroethylene, which has improved flexibility and better flame retardance.

Ethylene/tetrafluoroethylene copolymer

A laminated rubber stopper comprising a head portion and a leg portion which is to be inserted in an opening of a vessel, wherein at least a leg portion is laminated with a film of a copolymer of tetrafluoroethylene, ethylene and at least one fluorine-containing vinyl monomer copolymerizable with tetrafluoroethylene and ethylene, a molar ratio of tetrafluoroethylene and ethylene being from 62:38 to 90:10 and the amount of the fluorine-containing vinyl monomer being from 0.1 to 10% by mole based on the total number of mole of tetrafluoroethylene and ethylene, which has improved fitting with an opening of a vessel and sealing properties and can be produced with low failure rate.

Laminated rubber stopper

An optical material comprising a copolymer of:

Optical materials

A copolymer comprising monomeric units of tetrafluoroethylene, ethylene and at least one monomeric compound selected from the group consisting of 2-trifluoromethylpropylene and 2-methyl-1,1,3,3,3-pentafluoropropylene, which has a improved crack resistance at a high temperature.

Tetrafluoroethylene-ethylene type copolymer

A copolymer comprising monomeric units derived from ethylene, tetrafluoroethylene or chlorotrifluoroethylene and a fluorovinyl compound of the formula:

Ethylene/tetrafluoroethylene or chlorotrifluoroethylene copolymer

A process for preparing a tetrafluoroethylene/fluoro(alkyl vinyl ether) copolymer comprising polymerizing tetrafluoroethylene and fluoro(alkyl vinyl ether) in an aqueous suspension system which comprises a mixed medium of water and a fluorohydrocarbon or a chlorofluorohydrocarbon in a volume ratio of from 1:1 to 10:1 at a temperature of from 0.degree. to 25.degree. C. in the presence of a polymerization initiator of the formula:

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Osaka, Japan

Kiyohiko Ihara