Patent ID: 8071489

Claim:
A method of imparting oil repellency and grease repellency to a substrate comprising contacting the substrate, which is selected from the group consisting of cellulosic papers, paper products, flexible paper-like nonwoven products, and inorganic materials in fibrous form, with a copolymer prepared from monomers copolymerized in the following percentages by weight: (a) from about 60% to about 90% of a monomer of Formula 1, or a mixture thereof: R f -Q-COâ€”CRâ•CH 2 Formula 1 wherein: R f is a straight- or branched-chain perfluoroalkyl group of 2 to about 20 carbon atoms or a mixture thereof, R is H or CH 3 , Q is â€”(C n H 2n ) p SO 2 NR 1 (C n H 2n O) y â€”, or â€”(C n H 2n ) x CONR 1 (C n H 2n O) y â€”, wherein the â€”(C n H 2n ) is bonded to R f , R 1 is H or C 1 -C 20 alkyl, each n is independently 1 to about 6, x is 0 to about 4, p is 1 to about 20, and y is 0 to about 4, provided that x+y is a positive integer; (b) from about 10% to about 25% of a monomer of Formula 2, or a mixture thereof: CH 2 â•C(R)COZ(CH 2 ) q (CHR) r NR 2 R 3 Formula 2 wherein R, is H or CH 3 , R 2 and R 3 are each independently C 1 -C 4 alkyl, hydroxyethyl, or benzyl or R 2 and R 3 together with the nitrogen atom form a morpholine, pyrrolidine, or piperidine ring, Z is â€”Oâ€” or â€”NR 4 â€” wherein R 4 is H or C 1 - C 4 alkyl, r is 0 to 4, and q is 1 to 4, provided that the nitrogen bonded to R 2 and R 3 is from about 0% to 100% salinized, quaternized, or present as amine oxide; and (c) from about 1% to about 15% of a monomer of Formula 3, or a mixture thereof: CH 2 â•CR(R 5 ) e â€”COOHâ€ƒâ€ƒFormula 3 wherein R is H or CH 3 , R 5 is CO(CH 2 ) 5 , COâ€”Oâ€”(CH 2 ) 2 , C 6 H 4 CHR, or CONRR 6 , R 6 is C 6 H 4 OCH 2 , (CH 2 ) d , or C(CH 3 ) 2 CH 2 , d is 1 to about 10, and e is 0 or 1, provided that when Formula 1 is F(CF 2 CF 2 ) m C 2 H 4 SO 2 N(CH 3 )C 2 H 4 OC (O)C(R)â•CH 2 wherein m is from about 1 to about 10, then Formula 3 is present at a minimum of about 4% by weight.