Amphoteric fluorochemicals for paper

摘要

A method of imparting surface effects to a flexible, fibrous, nonwoven substrate or to a hard surface substrate comprising contacting the substrate with a composition prepared from polymerization of monomers in the following percentages by weight: (a) from 60% to 90% of a monomer of the formula R f -Q-CO-CR=CH 2 (formula 1) or a mixture thereof, wherein R f is a straight- or branched-chain perfluoroalkyl group of 2 to 20 carbon atoms or a mixture thereof, R is H or CH 3 , Q is -(C n H 2n ) x (C n H 2n O) y -, wherein the -(C n H 2n ) is bonded to R f , each n is independently 1 to 6, x is 0 to 4, and y is 0 to 4, provided that x + y is a positive integer; (b) from 10% to 25% of a monomer of the formula CH 2 =C(R)COZ(CH 2 ) q (CHR) r NR 2 R 3 (Formula 2) or a mixture thereof, 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 -O- or -NR 4 - wherein R 4 is H or C 1 - C 4 alkyl, r is 0 to 4, and q is 1 to 4; and (c) from 1% to 15% of a monomer of the formula CH 2 =CR(R 5 ) e -COOH (Formula 3) or a mixture thereof, wherein R is H or CH 3 , R 5 is CO(CH 2 ) 5 , CO-O-(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 10, and e is 0 or 1.