Patent ID: 7666940

Claim:
Aqueous dispersions consisting essentially of a mixture of: A) salts of perfluoropolyether di-carboxylic derivatives, having formula: T-O—R f -T (IA) wherein T=—CF 2 —COOZ or —CF 2 CF 2 —COOZ wherein Z=Na, K, NH 4 , or R 1 (R 2 )(R 3 )N wherein R 1 =R 2 =alkyl or hydroxyalkyl, R 3 =H, alkyl or hydroxyalkyl, R f is a (per)fluoropolyoxyalkylene chain having number average molecular weight between 500 and 10,000, wherein the salts are in an amount from 0.05% to 10% by weight of the aqueous dispersions; and B) water-dispersible or water-soluble cationic polymers, having a charge density, defined as number of equivalents per weight unit of dry polymer, higher than 1 meq/g of dry polymer, in an amount from 0.01% to 5% by weight of the aqueous dispersions; and wherein A) and B) are chemically and physically stable in the aqueous dispersions for at least two months at temperatures between 5° C. and 40° C.