FIELD: chemistry.
SUBSTANCE: aqueous dispersion of fluoropolymers contains a fluoropolymer, at least, one sugar-based emulsifier, an additive selected from the group consisting of a functionalizing ester and an anionic surfactant (sulfates, sulfonates, phosphonates) and 0 to 1000 ppm of fluorinated polyester emulsifier. The process for increasing the dispersion concentration of fluoropolymers involves the preparation of an aqueous dispersion of fluoropolymers comprising a fluoropolymer and a fluorinated polyester emulsifier having the general formula [Rf-O-L-A]M. The dispersion is heat treated in the presence of a sugar-based emulsifier. Heating causes phase stratification to an aqueous dispersion enriched in fluoropolymer and an aqueous phase depleted of fluoropolymer.
EFFECT: improving the properties of fluorinated dispersions containing a small amount of more biodegradable fluorinated polyester emulsifiers.
13 cl, 12 ex
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