Patent ID: 6979711

Claim:
An improved process for producing an oil and water repellent finish for textiles which comprises emulsion polymerization of a perfluoro(meth)acrylate ester with one or more hydrophilic group-containing esters wherein the improvement comprises polymerization in an aqueous solution containing 0.1 to 4.9% by weight of dipropylene glycol monomethyl ether acetate (CH 3 O(CH 2 ) 3 O(CH 2 ) 3 OCOCH 3 ) or propylene glycol diacetate (CH 3 OCO(CH 2 ) 3 OCOCH 3 ) relative to the water, wherein the copolymer is comprised of monomers copolymerized in the following percentages by weight: (a) from about 50% to about 85% of a monomer of formula I: R f —CH 2 CH 2 —OC(O)—C(R)═CH 2 I (b) from about 10% to about 25% of a monomer of formula II: R 2 —OC(O)—C(R)═CH 2 II (c) from 0.1% to about 5% of a monomer of the formula III HO—CH 2 CH 2 —OC(O)—C(R)═CH 2 III (d) from 0.1% to about 5% of a monomer of the formula IV: H—(OCH 2 CH 2 ) m —O—C(O)—C(R)═CH 2 IV (e) from 0.1% to about 3% of a monomer of the formula V: HO—CH 2 —NH—C(O)—C(R)═CH 2 V (f) and optionally, from 0% up to about 10% of vinylidene chloride (formula VI) or vinyl acetate (formula VII), or a mixture thereof: CH 2 ═CCl 2 VI CH 3 —(O)COCH═CH 2 VII wherein R f is a straight or branched-chain perfluoroalkyl group of from about 2 to about 20 carbon atoms, each R is independently H or CH 3 ; R 2 is an alkyl chain from about 2 to about 18 carbon atoms; and m is 2 to about 10.