Durable antisoling coatings for textile filaments

Claim 1

A durable antisoiling coating composition for textile filaments comprising an aqueous dispersion of (1) a perfluoroalkylester of a citric acid urethane and a fluorinated alcohol having the formula C n F 2n+1 (CH 2 ) m OH wherein n is 6 to 14 and m is 2 and of (2) the reaction product of (A) not less than 50% by weight, based on the weight of (A) plus (B), of an eoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having an epoxy equivalent weight of 750-5000; (B) a caboxyl-functional polymer in an amount sufficient to provide at least 1.25 equivalents of carboxyl groups, when the source of the carboxyl group is a mono-protic acid, and at least 2.0 equivalents of carboxyl groups, when the source of such groups is a diprotic acid, per equivalent of 1,2-epoxy groups in the epoxy resin, said polymer having a weight average molecular weight (determined by light scattering) of about 10000-160000 and an acid number of 100-500; (C) an aqueous solution of at least 1.25 equivalents of a tertiary amine per equivalent of 1,2-epoxy groups in the epoxy resin, said tertiary amine being selected from the group consisting of R 1 R 2 R 3 N, pyridine, N-methylpyrrole, N-methyl piperidine, N-methyl pyrrolidine, N-methyl morpholine, and mixtures thereof and wherein R 1 and R 2 are substituted or unsubstituted monovalent alkyl groups containing one or two carbon atoms in the alkyl portion and R 3 is a substituted or unsubstituted monovalent alkyl group containing 1-4 carbon atoms; and (D) optionally, 10-90% of the amount required for stoichiometric reaction with the carboxy-functional polymer of (B) of at least one primary, secondary or tertiary amine or monofunctional quaternary ammonium hydroxide; wherein Y is at least about 6+0.75(2 X ) wherein Y is the milliequivalent of carboxyl groups neutralized with primary, secondary or tertiary amine or mono-functional quaternary ammonium hydroxide per 100 grams of acid polymer plus epoxy, and X is the epoxy equivalent weight divided by 1000; and wherein for increasing ratios of carboxyl groups to 1,2-epoxy groups, the amount of amine is increased to keep the carboxyl-functional polymer water dispersible; with said ester being present in said dispersion in a ratio in parts by weight to said reaction product within the range of about 1:1 to 12:1.