Patent Number: 7,101,925

Title: Process for preparing fluoropolymer dispersions

Abstract: A process to substantially remove the fluorinated anionic surfactants comprising the following steps: a) addition to a fluoropolymer dispersion of a nonionic surfactant, in an amount in the range 1.5% 25% by weight, referred to the fluoropolymer weight; b) addition to the dispersion of a salt, soluble in water and not giving precipitates in the dispersion under the use conditions; c) contact of the dispersion with a basic anionic exchanger; d) separation of the dispersion from the basic anionic exchanger; before step d) the dispersion being filterable on a 180 micrometer net and successively on a 10 micrometer net.

Inventors: Malvasi; Marco (Alessandria, IT), Kapeliouchko; Valeri (Alessandria, IT)

Assignee: Solvay Solexis, S.p.A.

International Classification: C08J 3/00 (20060101); C08F 12/20 (20060101); C08F 220/04 (20060101); C08F 26/00 (20060101); C08K 3/20 (20060101)

Expiration Date: 9/05/02018