Daikin Industries, Ltd.

Sharp Kabushiki Kaisha Corporation

Other

Osaka University

Daiken Industries, Ltd.

Masayuki Tsuji

Taku Yamanaka

Yuuji Tanaka

Kazuya Kawahara

Toshihide Tsubata

Taketo Kato

Hirotoshi Yoshida

Masamichi Sukegawa

Yasuhiko Sawada

Michio Asano

Kazutaka Hosokawa

Keisuke Hagi

Ken Yoshida

Tsuyoshi Tokuda

Naoshi Yamada

Shunji Kasai

Hidehiko Yamaguchi

Yukio Kurozumi

Masayoshi Miyamoto

Takayuki Nakamura

Yuuki Kuwajima

Hirokazu Yukawa

Eiji Masuda

Nobuhiro Waka

Yoshinori Kinai

Kozue Osawa

Yuhko Hashimoto

Mayumi Yamauchi

Akira Shimodo

Tetsuo Shimizu

Nobuhiko Tsuda

Yuhko Hisada

Yoshiyuki Shibuya

Haruhisa Masuda

Shoji Kawachi

Tadashi Ino

Hiroyuki Yoshimoto

Takuya Arase

Shinichi Hirato

Taimi Oketani

Shigeo Daimon

Akihiro Oshima

Fumihiro Kamiya

Toshio Yoshida

Yasuhiro Nakano

Ikuo Kitamura

Masami Ogura

Takayuki Hayano

Shingo Tanigawa

Kohei Yasuda

Yuji Amano

Noriko Iwata

Kohji Hayashi

Kenji Futatsugi

Yuji Fukushima

Michio Hori

Motohiro Okuyama

Kazuyuki Tamura

Isao Saraoka

Chisato Higashi

Chisato Iguchi

Jirou Hiromoto

Shigeki Santou

A tube or a hose including a fluoroelastomer and a polytetrafluoroethylene, the tube or the hose being an extruded article. The polytetrafluoroethylene is dispersed in a state of single particles in the extruded article, or the polytetrafluoroethylene has a specific surface area of less than 8 m/g. Also disclosed is an extruded laminate including a fluoroelastomer layer formed form the tube or hose and a polymer layer.

Layered body and extrusion-molded article

A method for producing low-molecular-weight polytetrafluoroethylene containing a reduced amount of C4-C16 perfluorocarboxylic acids and salts thereof, as well as a powder containing low-molecular weight polytetrafluoroethylene, the method including (1) irradiating polytetrafluoroethylene containing a C4-C16 perfluorocarboxylic acid or any salt thereof and having a heat-of-fusion reduction of 40% or lower between first heating and second heating in differential scanning calorimetry with radiation to a dose of 5 to 1000 kGy substantially in the absence of oxygen at a temperature of lower than 100° C. to provide low-molecular-weight polytetrafluoroethylene containing a reduced amount of the perfluorocarboxylic acid and any salt thereof and having a melt viscosity at 380° C. of 1.0×10to×10Pa·s.

Low-molecular-weight polytetrafluoroethylene production method and powder

Provided is a laminate comprising a fluoroelastomer layer and a polymer layer, wherein the fluoroelastomer layer is formed of a fluoroelastomer composition containing a fluoroelastomer, a basic polyfunctional compound, and a polytetrafluoroethylene, and the polytetrafluoroethylene is dispersed in a state of single particles in the fluoroelastomer layer.

A method for producing low-molecular-weight polytetrafluoroethylene which includes: (1) irradiating high-molecular-weight polytetrafluoroethylene with radiation to a dose of 250 kGy or higher substantially in the absence of oxygen to provide low-molecular-weight polytetrafluoroethylene having a melt viscosity at 380° C. of 1.0×10to 7.0×10Pa·s. Also disclosed is a powder containing the low-molecular-weight polytetrafluoroethylene, the powder being substantially free from any of perfluorooctanoic acid and salts thereof.

Method for producing low-molecular weight polytetrafluoroethylene, and powder

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 method for producing a composition containing low molecular weight polytetrafluoroethylene, the method including: (I) irradiating a composition containing high molecular weight polytetrafluoroethylene with ionizing radiation to obtain a composition containing low molecular weight polytetrafluoroethylene having a melt viscosity at 380&#xb0; C. in the range of 1.0&#xd7;10to 7.0&#xd7;10Pa&#xb7;s; and (II) carrying out fluorination treatment on the composition containing low molecular weight polytetrafluoroethylene obtained above.

Method for producing composition containing low molecular weight polytetrafluoroethylene

A method for producing low molecular weight polytetrafluoroethylene which includes: (1) feeding into an airtight container in the absence of oxygen: high molecular weight polytetrafluoroethylene: and a halogenated polymer having a halogen atom other than a fluorine atom; and (2) irradiating the high molecular weight polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a melt viscosity at 380&#xb0; C. of 1.0&#xd7;10to 7.0&#xd7;10Pa&#xb7;s.

Manufacturing method for low molecular weight polytetrafluoroethylene

A method for producing a composition containing low molecular weight polytetrafluoroethylene, the method including: (I) irradiating a composition containing high molecular weight polytetrafluoroethylene with ionizing radiation to obtain a composition containing low molecular weight polytetrafluoroethylene having a melt viscosity at 380&#xb0; C. in the range of 1.0&#xd7;10to 7.0&#xd7;10Pa&#xb7;s; and (II) carrying out at least one selected from the group consisting of washing treatment, steam treatment and decompression treatment on the composition containing low molecular weight polytetrafluoroethylene.

A method for producing a composition containing low molecular weight polytetrafluoroethylene, the method including: (I) irradiating a composition containing high molecular weight polytetrafluoroethylene with ionizing radiation to obtain a composition containing low molecular weight polytetrafluoroethylene having a melt viscosity at 380&#xb0; C. in the range of 1.0&#xd7;10to 7.0&#xd7;10Pa&#xb7;s; and (II) decomposing a low molecular weight fluorine-containing compound contained in the composition containing low molecular weight polytetrafluoroethylene obtained above.

The disclosure provides a method for producing low molecular weight polytetrafluoroethylene containing less C6-C14 perfluorocarboxylic acids or salts thereof. The method for producing low molecular weight polytetrafluoroethylene includes: (1) irradiating high molecular weight polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a melt viscosity of 1.0&#xd7;10to 7.0&#xd7;10Pa&#xb7;s at 380&#xb0; C.; and (2) irradiating the low molecular weight polytetrafluoroethylene to a dose that does not decompose the low molecular weight polytetrafluoroethylene.

Method for producing low molecular weight polytetrafluoroethylene

The present invention aims to provide a paste containing polytetrafluoroethylene which can be formed into a molded polytetrafluoroethylene article having a significantly small thickness of polytetrafluoroethylene and is less likely to cause defects in molding; and a method of producing the paste. The present invention provides a method of producing a paste, including the steps of coagulating primary particles of polytetrafluoroethylene in an aqueous dispersion that contains the primary particles and water to form slurry that contains secondary particles of polytetrafluoroethylene and water or secondary particles of polytetrafluoroethylene floating in water; and adding an organic solvent to at least one of the slurry and the secondary particles of polytetrafluoroethylene floating in water to provide the paste.

Paste containing polytetrafluoroethylene and method for producing same

The invention provides a polytetrafluoroethylene composition having high flowability. The polytetrafluoroethylene composition contains a particulate polytetrafluoroethylene having fibrillability and a particulate synthetic amorphous silica. The particulate polytetrafluoroethylene is a polytetrafluoroethylene fine powder or a polytetrafluoroethylene molding powder. The particulate synthetic amorphous silica is obtained by a dry process and has an average primary particle size smaller than 200 nm. The particulate synthetic amorphous silica is attached to the surface of the particulate polytetrafluoroethylene.

Polytetrafluoroethylene composition

Provided is a method for producing low molecular weight polytetrafluoroethylene less likely to generate C6-C14 perfluorocarboxylic acids and salts thereof. The method for producing low molecular weight polytetrafluoroethylene includes: (1) feeding into an airtight container: high molecular weight polytetrafluoroethylene: and a gas mixture containing an inert gas and oxygen and having an oxygen content relative to the total of the inert gas and oxygen of 1 to 10 vol %; and (2) irradiating the high molecular weight polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a melt viscosity at 380&#xb0; C. of 1.0&#xd7;10to 7.0&#xd7;10Pa&#xb7;s.

Manufacturing method for low molecular weight polytetrafluoroethylene, and powder

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).

Growing community of inventors

Osaka, Japan

Masayuki Tsuji