Concentrated aqueous latex of ethylene/C.sub.2 -C.sub.3 -perfluorocarbon copolymer or terpolymer
AssigneePennwalt Corporation
InventorsRichard A. Ferren, Daniel A. Dimmig, John C. Grigger
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Abstract
A process for preparing an aqueous concentrated latex of a copolymer or terpolymer of ethylene and a C.sub.2 -C.sub.3 -perfluorocarbon by creaming a latex of 25-30% copolymer solids and recovering a concentrated latex having 1.5-2.5 times the concentration of the starting latex. The concentrated latex can be used to prepare crack-free or void-free coatings on substrates.
Claims4
A process for preparing a water-based concentrated latex of a copolymer or terpolymer containing approximately equimolar amounts of ethylene and tetrafluoroethylene and 0-10 mole % hexafluoropropylene which comprises mixing at about 30.degree.-80.degree. C. an aqueous latex containing about 25-30% solids of said copolymer or terpolymer and 6-20% by weight of the latex solids of a surfactant, allowing the mixture to stand quiescent until two layers form, separating off the upper layer and recovering the lower layer as a concentrated latex containing 1.5 to 2.5 times the percent solids content of the starting latex.
Dependencies are inferred from the claim text.