Patent ID: 6180740
Filing Date: 2001-01-30
Classification: C08F,C09K,D06M,G03B

Abstract:
A process for preparing an oil- and water-repellent aqueous emulsion composition comprising1) forming a mixture with water comprising by weight:(a) from about 50% to about 85% by weight on a water free basis of polymer chain units derived from a mixture of perfluoroalkylethyl acrylate monomers of the formula:R.sub.f -Q-A--C(O)--C(R).dbd.CH.sub.2whereinR.sub.f is a straight or branched-chain perfluoroalkyl group containing from 2 to 20 carbon atoms,R is H or CH.sub.3,A is O, S, or N(R'),Q is alkylene of 1 to 15 carbon atoms, hydroxyalkylene of 3 to 15 carbon atoms, --(C.sub.n H.sub.2n)(OC.sub.q H.sub.2q)m-, --SO.sub.2 --NR'(C.sub.n H.sub.2n)--, or --CONR'(C.sub.n H.sub.2n)--,R' is H or alkyl of 1 to 4 carbon atoms,n is 1 to 15, q is 2 to 4, and m is 1 to 15;(b) from 1% to 8% by weight on a water free basis of monomer chain units derived from vinylidene chloride; and,(c) from about 10% to about 25% by weight on a water free basis of monomer chain units derived from an alkyl acrylate or alkyl (meth)acrylate having an alkyl chain length of 2 to 18 carbons; and(d) from about 0.25% to about 5% by weight on a water free basis of a cationic surfactant;2) polymerizing said mixture, and3) adding an anionic surfactant in an amount sufficient to yield an emulsion with a zeta potential of between +15 and +30 millivolts, useful for textile application.