Daikin Industries, Ltd.

Keisuke Hagi

Ken Yoshida

Kazuya Kawahara

Yuuji Tanaka

Taku Yamanaka

Masayuki Tsuji

Taketo Kato

Hirotoshi Yoshida

Masamichi Sukegawa

Kazutaka Hosokawa

Hirokazu Yukawa

Tomihiko Yanagiguchi

Ryo Inoue

Takuma Maruhashi

Yuma Osafune

A polytetrafluoroethylene composition containing polytetrafluoroethylene and fibrous filler. The fibrous filler has an average fiber length of 100 μm or shorter and includes fibers having a fiber length of longer than 160 μm in a proportion of 15% by mass or less.

Polytetrafluoroethylene composition

A resin composition including polytetrafluoroethylene (A); graphite (B); talc (C); and an abrasion resistance-improving filler (D), the resin composition containing 50 to 80 parts by mass of the polytetrafluoroethylene (A), 1 to 35 parts by mass of the graphite (B), 1 to 35 parts by mass of the talc (C), 16 to 40 parts by mass of a total of the graphite (B) and the talc (C), and 2 to 10 parts by mass of the abrasion resistance-improving filler (D) relative to 100 parts by mass of a total of the polytetrafluoroethylene (A), the graphite (B), the talc (C), and the abrasion resistance-improving filler (D). Also disclosed is a molded article obtained by compression molding, extrusion molding, or injection molding the resin composition.

Resin composition, molded article, and automatic transmission

Powder including low molecular weight polytetrafluoroethylene having a melt viscosity of 1×10to 7×10Pa·s at 380° C., having a melt viscosity of 1×10to 7×10Pa·s at 380° C., having an average particle size of 1.0 to 50 μm, and containing 30 or more carboxyl groups at ends of the molecule chain per 10carbon atoms in the main chain, wherein the powder is substantially free from C8-C14 perfluorocarboxylic acids and salts thereof.

Method for producing low molecular weight polytetrafluoroethylene, low molecular weight polytetrafluoroethylene, and powder

Powder including low molecular weight polytetrafluoroethylene having a melt viscosity of 1&#xd7;10to 7&#xd7;10Pa&#xb7;s at 380&#xb0; C., having a melt viscosity of 1&#xd7;10to 7&#xd7;10Pa&#xb7;s at 380&#xb0; C., having an average particle size of 1.0 to 50 &#x3bc;m, and containing 30 or more carboxyl groups at ends of the molecule chain per 10carbon atoms in the main chain, wherein the powder is substantially free from C8-C14 perfluorocarboxylic acids and salts thereof.

A resin composition containing a crystalline resin having a melting point of 290&#xb0; C. or higher, a graphite yarn (A) having a crystallite size in a c-axis direction of not greater than 30.0 &#x212b;, and a graphite yarn (B) having a crystallite size in a c-axis direction of greater than 100.0 &#x212b;.

Resin composition

The invention provides a production method for producing low molecular weight polytetrafluoroethylene enabling easy removal of most of C8-C14 perfluorocarboxylic acids and salts thereof, which are unfortunately generated by irradiation, from the low molecular weight polytetrafluoroethylene. The method for producing low molecular weight polytetrafluoroethylene includes: (1) irradiating polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a melt viscosity of 1&#xd7;10to 7&#xd7;10Pa&#xb7;s at 380&#xb0; C.; (2) pulverizing the low molecular weight polytetrafluoroethylene; and (3) heating the low molecular weight polytetrafluoroethylene pulverized in the step (2).

Low molecular weight polytetrafluoroethylene powder having a complex viscosity of 1&#xd7;10to 7&#xd7;10Pa&#xb7;s at 380&#xb0; C., containing 5 or less carboxyl groups at ends of the molecule chain per 10carbon atoms in the main chain, and being substantially free from C8-C14 perfluorocarboxylic acids and salts thereof. Also disclosed is a method for producing low molecular weight polytetrafluoroethylene.

A method for producing low molecular weight polytetrafluoroethylene less likely to generate C8-C14 perfluorocarboxylic acids and salts thereof. The method includes: (1) feeding into an airtight container: polytetrafluoroethylene; at least one additive selected from the group consisting of hydrocarbons, chlorinated hydrocarbons, alcohols, and carboxylic acids other than C8-C14 perfluorocarboxylic acids; and at least one selected from the group consisting of inert gases other than the above additive and oxygen adsorbents; and (2) irradiating the polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a complex viscosity of 1&#xd7;10to 7&#xd7;10Pa&#xb7;s at 380&#xb0; C.

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Osaka, Japan

Keisuke Hagi