Method for producing modified polytetrafluoroethylene, method for producing modified polytetrafluoroethylene powder, and method for producing stretched porous material

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United States of America Patent

PATENT NO 11780943
APP PUB NO 20210009732A1
SERIAL NO

17021129

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Abstract

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To provide a method for producing modified polytetrafluoroethylene, in which formation of a fluorinated oligomer as a by-product is little. A method for producing modified polytetrafluoroethylene which contains substantially no C6-34 fluorinated oligomer containing hydrophilic functional groups and which contains substantially no fluorinated surfactant, the method comprising conducting copolymerization of tetrafluoroethylene and a monomer having a polar group, in a liquid dispersion 1 comprising a polymer containing units derived from a non-fluorinated monomer and an aqueous medium, or in a solution 2 obtainable by mixing at least one member selected from the group consisting of a polyalkylene oxide compound and a hydrocarbon-containing surfactant, with an oxidizing agent, in an aqueous medium, under such a condition that the amount of the monomer having a polar group to be used, is at most 0.150 mass % to the whole amount of tetrafluoroethylene, to obtain modified polytetrafluoroethylene.

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Patent Owner(s)

Patent OwnerAddress
AGC INC5-1 MARUNOUCHI 1-CHOME CHIYODA-KU TOKYO 100-8405

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ebata, Shiro Chiyoda-ku, JP 7 3
Higuchi, Shinya Chiyoda, JP 29 149
Kose, Takehiro Chiyoda-ku, JP 31 76

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