Aqueous fluoropolymer dispersion
AssigneeDaikin Industries, Ltd.
InventorsChie Sawauchi, Nobuhiko Tsuda, Wade Martin Simpson
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Abstract
An object of the present invention is to provide an aqueous fluoropolymer dispersion inhibited from viscosity rising and excellent in mechanical stability in spite of a low fluorinated surfactant concentration. The invention provides an aqueous fluoropolymer dispersion comprising particles of a fluoropolymer as dispersed in an aqueous medium wherein a fluorinated surfactant (A) having a molecular weight lower than 1000 amounts to not higher than 100 ppm of the mass of the fluoropolymer, the aqueous fluoropolymer dispersion containing an anionic surfactant (B) other than the fluorinated surfactant (A) as well as a water-soluble polymer (C).
Claims15
A method for producing an aqueous fluoropolymer dispersion comprising the steps of:
- polymerizing a fluoromonomer in an aqueous medium in the presence of a fluorinated surfactant (A) having a molecular weight lower than 1000 to obtain an aqueous fluoropolymer dispersion comprising a particle of fluoropolymer as dispersed in the aqueous medium,
- eliminating the fluorinated surfactant (A) to obtain an aqueous fluoropolymer dispersion containing the, fluorinated surfactant (A) of not higher than 100 ppm of the mass of the fluoropolymer, and
- adding an anionic surfactant (B) other than said fluorinated surfactant (A) to the aqueous fluoropolymer dispersion,
- wherein the anionic surfactant (B) is C5F11COOH or salt thereof.
Dependencies are inferred from the claim text.