METHOD FOR PRODUCING TETRAFLUOROETHYLENE COPOLYMER AQUEOUS DISPERSION

To provide a method for producing a tetrafluoroethylene copolymer-containing aqueous dispersion excellent in stability against a mechanical stress. The method for producing an aqueous dispersion containing a tetrafluoroethylene copolymer is characterized by comprising a polymerization step of subjec...

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Bibliographische Detailangaben
Hauptverfasser:	KOBAYASHI, Shigeki, TAKAZAWA, Masahiro, WADE, Anthony Eugene, NAGAI, Hiroki, CAINE, Diane, HIGUCHI, Shinya, TANAKA, Akiko, MORGOVAN-ENE, Ariana Claudia
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS CORRECTING FLUIDS DYES FILLING PASTES INKS MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	To provide a method for producing a tetrafluoroethylene copolymer-containing aqueous dispersion excellent in stability against a mechanical stress. The method for producing an aqueous dispersion containing a tetrafluoroethylene copolymer is characterized by comprising a polymerization step of subjecting tetrafluoroethylene (TFE) and a (perfluoroalkyl) ethylene to a polymerization reaction in an aqueous medium using a polymerization initiator in the presence of a fluorinated emulsifier, to obtain an aqueous emulsion having a solid content concentration of from 10 to 45 mass%, and a concentrating step of adding a nonionic surfactant represented by R 1 -O-A-H (R 1 is a C 8-18 alkyl group, and A is a polyoxyalkylene chain) to the aqueous emulsion, followed by concentration to a solid content concentration of from 50 to 70% to obtain an aqueous dispersion, wherein in the polymerization step, TFE is continuously or intermittently supplied to the polymerization reaction vessel, and a chain transfer agent is added at the time when from 10 to 95 mass% of the total mass of TFE to be used in the polymerization reaction has been supplied.