Daikin Industries, Ltd.

Yoshiyuki Takase

Yoshiyuki Hiraga

Tadahiro Yabu

Masayuki Namimatsu

Kenji Ishii

Shouji Fukuoka

Takahiro Kitahara

Hideki Kono

Takeshi Shimono

Ryouichi Fukagawa

Sadashige Irie

Jihong Liu

Kenji Otoi

Shingo Sakakibara

Hideya Saitou

Mai Taguchi

Yukari Karasawa

Yosuke Shojima

The invention provides novel pellets having high fluidity in a hopper of an extruder and capable of forming a coating layer having good wire diameter stability and capacitance stability even when used for rapid molding of electric wire coating. The pellets contain a fluororesin. Each of the pellets, placed on a horizontal surface, has a substantially circular outline or a substantially elliptic outline and has a major axis Dof 3.1 mm or shorter and a minor axis Dof 3.1 mm or shorter when observed in the direction normal to the horizontal surface. Each pellet satisfies the following formula (1): (D+D)/2L=1.8 to 2.6, wherein Drepresents the major axis, Drepresents the minor axis, and L represents the height from the horizontal surface to the highest point of the pellet.

Fluoroplastic pellets, electric wire, and method for producing same

A method of producing a fluoropolymer by which a melt-processable fluoropolymer (A) having a specific unstable terminal group or groups (P) is subjected to melt-kneading in a kneader having a stabilization treatment zone to thereby produce a fluoro-polymer (B) resulting from conversion of the specific unstable terminal group or groups (P) to &#x2014;CFH. The specific unstable terminal group or groups (P) include alkoxycarbonyl groups, fluoroalkoxycarbonyl groups and/or carboxyl group quaternary nitrogen compound salts, the melt-kneading is carried out in the absence or presence of an alkali metal element or alkaline earth metal element, the content of the alkali metal element or alkaline earth metal element is not greater than 2 ppm of the composition under melt-kneading, and the melt-kneading in the stabilization treatment zone is carried out in the presence of water. A fluoro-polymerized material is also disclosed.

Process for production of fluorine-containing polymers and fluorine-containing polymers

A method of producing a fluoropolymer by which a melt-processable fluoropolymer (A) having a specific unstable terminal group or groups (P) is subjected to melt-kneading in a kneader having a stabilization treatment zone to thereby produce a fluoro-polymer (B) resulting from conversion of the specific unstable terminal group or groups (P) to &#x2014;CFH. The specific unstable terminal group or groups (P) include alkoxycarbonyl groups, fluoroalkoxycarbonyl groups and/or carboxyl group quaternary nitrogen compound salts, the melt-kneading is carried out in the absence or presence of an alkali metal element or alkaline earth metal element, the content of the alkali metal element or alkaline earth metal element is not greater than 2 ppm of the composition under melt-kneading, and the melt-kneading in the stabilization treatment zone is carried out in the presence of water. A fluoro-polymerised material is also disclosed.

The present invention provides a polymerization inhibitor preventing the self-polymerization of TFE and the generation of a modified polymer of a polymerization inhibitor in a distillation step, particularly in a rectification step, of TFE. The present invention provides a method of distilling tetrafluoroethylene in the presence of a polymerization inhibitor comprising a cyclohexadiene compound of the formula:R-A-Rwherein Ris a hydrocarbon group having 1 to 5 carbon atoms, Ris a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, and A is a cyclohexadiene ring. The cyclohexadiene compound is preferably &#x3b1;-terpinene or &#x3b3;-terpinene.

Polymerization inhibitor for tetrafluoroethylene

A fluororesin composition including a tetrafluoroethylene/hexafluoropropylene-based copolymer and 0.01 to 3 parts by mass per 100 parts the copolymer of a polytetrafluoroethylene having a standard specific gravity of 2.15 to 2.30, and being obtained by mixing an aqueous dispersion of the tetrafluoroethylene/hexafluoropropylene-based copolymer with an aqueous dispersion of the polytetrafluoroethylene, causing coagulation, drying the polymer mixture and melt-extruding the same.

Fluororesin composition and electric wire

The present invention provides a fluororesin composition, which is excellent in moldability and crack resistance, a process for preparing the composition and a cable evenly coated with the composition. Specifically, the present invention provides a fluororesin composition wherein polytetrafluoroethylene is compounded to a terpolymer comprising tetrafluoroethylene, hexafluoropropylene and perfluoroalkyl vinylether. Also, the present invention provides a process for preparing the composition which comprises kneading with a multi-screw kneader. Furthermore, the present invention provides a cable which is coated with the resin.

Fluororesin composition, process for preparing the same and cable coated with the same

The present invention provides a fluororesin composition, which is excellent in moldability and crack resistance and particularly, does not cause cone break when coating an electric wire, a process for preparing the composition and a cable coated with the composition. Specifically, the present invention provides a fluororesin composition comprising a tetrafluoroethylene/hexafluoropropylene copolymer and polytetrafluoroethylene compounded thereto, which has a melt flow rate of at least 15 at 372&#xb0; C. Also, the present invention provides a process for preparing the composition which comprises kneading with a multi-screw kneader. Furthermore, the present invention provides a cable which is coated with the resin.

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Settsu, Japan

Yoshiyuki Takase