Method of producing fluoropolymers using alkyl sulfate surfactants
AssigneeArkema Inc.
InventorsRamin Amin-Sanayei, Lotfi Hedhli, mehdi Durali, Roice A. Wille
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Abstract
The invention relates to methods of polymerizing fluoromonomers using non-fluorinated surfactants, in particular to emulsion polymerization method for producing fluoropolymer latex. Specifically, the method of polymerization uses one or more alkyl sulfate surfactants.
Claims22
A process for preparing a fluoropolymer in an aqueous reaction medium, comprising:
- a) forming an aqueous emulsion comprising at least one alkyl sulfate surfactant and at least one fluoromonomer;
- and
- b) initiating polymerization of said fluoromonomer.
A process for preparing a fluoropolymer in an aqueous reaction medium, comprising:
- a) forming an aqueous emulsion comprising a first at least one alkyl sulfate surfactant, at least one fluoromonomer, and optionally an initiator;
- b) initiating polymerization of said fluoromonomer;
- and
- c) continuously feeding a second at least one sulfate surfactant to the reaction medium.
A process for preparing a fluoropolymer in an aqueous reaction medium, comprising:
- a) forming an aqueous emulsion comprising at least one fluoromonomer and an initiator;
- b) initiating polymerization of said fluoromonomer;
- and
- c) introducing at least one alkyl sulfate surfactant to the aqueous reaction medium after polymerization and during a finishing stage.
A method for recovering a fluoropolymer from an aqueous latex, comprising introducing at least one alkyl sulfate surfactant to the aqueous latex.
A stable aqueous fluoropolymer composition comprising 10 to 1500 ppm of at least one alkyl sulfate, 10 to 1500 ppm of at least one non-ionic block copolymer, wherein the weight average particle size of said fluoropolymer is between 10 and 299 nm.
Dependencies are inferred from the claim text.