METHOD FOR PRODUCING TETRAFLUOROETHYLENE COPOLYMER AQUEOUS DISPERSION

Title:

METHOD FOR PRODUCING TETRAFLUOROETHYLENE COPOLYMER AQUEOUS DISPERSION

Document Type and Number:

WIPO Patent Application WO/2017/094801

Kind Code:

A1

Abstract:

Provided is a method for producing a tetrafluoroethylene copolymer aqueous dispersion having excellent stability to mechanical stress. A method for producing an aqueous dispersion containing a tetrafluoroethylene copolymer characterized by having a polymerization step for obtaining an aqueous emulsion that has a solids concentration of 10-45 mass% by polymerizing tetrafluoroethylene (TFE) and (perfluoroalkyl) ethylene in an aqueous medium using a polymerization initiator in the presence of a fluorine-containing emulsifier, and a concentration step for obtaining an aqueous dispersion by adding a nonionic surfactant represented by Ｒ１－Ｏ－Ａ－Ｈ (R1 is a C8-18 alkyl group, A is a polyoxyalkylene chain) to the aqueous emulsion and concentrating to a solids concentration of 50-70%; and by supplying TFE continuously or intermittently to the polymerization reactor in the polymerization step and adding a chain transfer agent when 10-95 mass% of the total mass of TFE to be used in the polymerization reaction has been supplied.

Inventors:

KOBAYASHI SHIGEKI (JP)
NAGAI HIROKI (JP)
HIGUCHI SHIYA (JP)
TANAKA AKIKO (JP)
TAKAZAWA MASAHIRO (JP)
MORGOVAN-ENE ARIANA CLAUDIA (GB)
WADE ANTHONY EUGENE (GB)
CAINE DIANE (GB)

Application Number:

PCT/JP2016/085622

Publication Date:

June 08, 2017

Filing Date:

November 30, 2016

Export Citation:

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Assignee:

ASAHI GLASS CO LTD (JP)
AGC CHEMICALS EUROPE LTD (GB)

International Classes:

C08F214/26; C08F2/44; C08F214/18

Domestic Patent References:

WO2011055824A1

2011-05-12

Foreign References:

JP2008540807A	2008-11-20
JP2012207232A	2012-10-25
JP2002308914A	2002-10-23
JP2012162708A	2012-08-30
JPH05279579A	1993-10-26

Other References: