Daikin Industries, Ltd.

Tatsuya Funaoka

Hitoshi Imamura

Hideki Kono

Ryouichi Yano

Takahisa Aoyama

Takahiro Kitahara

Takashi Sekiguchi

Takeshi Shimono

Kazunobu Uchida

Yuuko Takano

Hirokazu Itou

Manabu Fujisawa

Junya Iida

Provided is a copolymer consisting essentially of ethylene units, tetrafluoroethylene units, and hexafluoropropylene units, wherein a molar ratio (Et units/TFE units) of the ethylene (Et) units to the tetrafluoroethylene (TFE) units is 52.0/48.0 to 56.0/44.0, and a content of the hexafluoropropylene units is 19.0 to 21.0 mol % based on the total monomer units constituting the copolymer.

Copolymer

An ethylene/tetrafluoroethylene copolymer satisfying the following formula (1):75≤ tan δ(60)/tan δ(5)×100≤225  (1)wherein peak intensities, determined by Fourier transform infrared spectroscopy, of vibrations derived from a —CFH group, a —CFCHCOF group, a —COF group, a —COOH group, a dimer of a —CFCOOH group and a monomer of a CFCHCOOH group, a —COOCHgroup, a —CONHgroup, and a —CHOH group satisfy the following formula (2):PI/(PI+PI+PI+PI+PI+PI+PI)≥0.60  (2)wherein the loss tangents (tan δ) and peak intensities (PI) are as defined herein.

Ethylene/tetrafluoroethylene copolymer

The invention provides a molded article containing a specific fluororesin and having excellent hydrophilicity. The molded article containing the fluororesin has a melt flow rate of 1.00 g/10 min or lower and a water contact angle of 90&#xb0; or smaller. The fluororesin contains at least one copolymer selected from the group consisting of a copolymer containing a tetrafluoroethylene unit and a perfluoro(alkylvinylether) unit and a copolymer containing a tetrafluoroethylene unit and a hexafluoropropylene unit.

Molded article and manufacturing method for molded article

An ethylene/tetrafluoroethylene copolymer satisfying the following formula (1), wherein peak intensities, determined by Fourier transform infrared spectroscopy, of vibrations derived from a &#x2014;CFH group, a &#x2014;CFCHCOF group, a &#x2014;COF group, a &#x2014;COOH group, a dimer of a &#x2014;CFCOOH group and a monomer of a CFCHCOOH group, a &#x2014;COOCHgroup, a &#x2014;CONHgroup, and a &#x2014;CHOH group satisfy the following formula (2):75&#x2264;tan &#x3b4;(60)/tan &#x3b4;(5)&#xd7;100&#x2264;225&#x2003;&#x2003;(1)PI/(PI+PI+PI+PI+PI+PI+PI)&#x2265;0.60&#x2003;&#x2003;(2)

The invention provides a process for producing a modified molded article capable of providing a diaphragm that is less likely to generate particles. The process for producing a modified molded article includes: molding modified polytetrafluoroethylene containing a tetrafluoroethylene unit and a modifying monomer unit based on a modifying monomer copolymerizable with tetrafluoroethylene to provide a molded article; and irradiating the molded article with not lower than 30 kGy but lower than 70 kGy of radiation at 270&#xb0; C. to 310&#xb0; C. to provide a modified molded article.

Process for producing modified molded article, molded article, diaphragm, and diaphragm valve

The present invention aims to provide a method for producing a modified molded article that has favorable appearance, high breaking strength, and excellent abrasion resistance, as well as excellently low permeability to nitrogen gas and hydrochloric acid. The method for producing a modified molded article of the present invention includes molding a fluororesin to provide a molded article and irradiating the molded article with radiation at an irradiation dose of lower than 100 kGy at 50&#xb0; C. to 200&#xb0; C. to provide a modified molded article.

Method for producing modified molded article of fluororesin

A method for producing a modified molded article which includes molding a fluororesin to provide a molded article and irradiating the molded article with radiation at an irradiation dose of lower than 100 kGy at 50&#xb0; C. to 200&#xb0; C. to provide a modified molded article.

A modified fluorine-containing copolymer obtained by irradiating a copolymer with radiation at a temperature of not higher than the melting point of the copolymer. The copolymer includes at least one copolymer selected from a copolymer including a tetrafluoroethylene unit and a perfluoro(alkyl vinyl ether) unit and a copolymer including a tetrafluoroethylene unit and a hexafluoropropylene unit, and has 10 to 10000 functional groups in total per 10carbon atoms.

Modified fluorine-containing copolymer and fluorine resin molded article

A heat-resistant electric wire including a core wire and a coating that covers the core wire. The coating is formed from a modified fluorine-containing copolymer that is obtained by irradiating a copolymer with radiation at an exposure of 250 kGy or lower at a temperature of not higher than the melting point of the copolymer. The copolymer is at least one copolymer selected from a copolymer including a tetrafluoroethylene unit and a perfluoro(alkyl vinyl ether) unit and a copolymer including a tetrafluoroethylene unit and a hexafluoropropylene unit.

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Osaka, Japan

Tatsuya Funaoka