Daikin Industries, Ltd.

Other

Masuo Kokumai

Tetsuo Shimizu

Mitsuru Kishine

Takahisa Aoyama

Makoto Ono

Masahiko Oka

Kazutaka Hosokawa

Hirokazu Yukawa

Hideya Saito

Kazuhide Sawada

Tetsuo Kitahaba

Sang Bong Han

Yukiharu Nakamura

Yukinaru Nakamura

Polytetrafluoroethylene molding powder which comprises 0.01 to 1% by weight of a perfluoro(vinyl ether) unit and which has a heat of crystallization of 18.0 to 25.0 J/g. The molding powder provides a molded article which has a flex life of not less than 7 million cycles, a creep resistance (total deformation at 200.degree. C.) of not more than 20%, and a creep resistance (total deformation at 25.degree. C.) of not more than 15%. The polytetrafluoroethylene molding powder which is excellent in both creep resistance and flex fatigue resistance is provided as a molding material for parts which are repeatedly bent such as pump.

Polytetrafluoroethylene molding powder

Fluorovinyl ether

Modified PTFE fine powder which comprises colloidal particles of a copolymer comprising repeating units derived from tetrafluoroethylene and 0.02 to 0.3 % by weight, preferably 0.03 to 0.2% by weight of repeating units derived from at least one fluoroalkyl vinyl ether selected from compounds of the formula:

Modified polytetrafluoroethylene fine powder and process for preparing

Modified PTFE fine powder which comprises colloidal particles of a copolymer comprising repeating units derived from tetrafluoroethylene and 0.02 to 0.3% by weight, preferably 0.03 to 0.2% by weight of repeating units derived from at least one fluoroalkyl vinyl ether selected from compounds of the formula:

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Itami, Japan

Masuo Kokumai