Aqueous dispersion of a surface active polymer having enhanced performance properties

An aqueous dispersion of a surface active polymer from polymerization of monomers comprising:

• A) from about 0.1-95 weight percent based on total monomers of at least one monomer having the formula:
• ##STR4## in which R.sub.1 and R.sub.2, identical or different are C.sub.1 -C.sub.6 alkyl, and X.sup.- is mineral and/or organic anion,
• B) from about 0.1-95 weight percent based on total monomers of at least one vinyl monomer having at least one amide group,
• C) from about 0.5-75 weight percent based on total monomers of at least one vinyl monomer of the formula:
• H.sub.2 C.dbd.C(R.sub.6)--C(O)--O--›CH.sub.2 CH(R.sub.7)O!.sub.m --(CH.sub.2 CH.sub.2 O).sub.n --R.sub.8
• in which R.sub.6 is H or C.sub.1 -C.sub.6 alkyl group;
• R.sub.7 is C.sub.1 -C.sub.4 alkyl;
• n is an average number from about 6-100 and m is an average number from about 0-50 provided that n is superior or equal to m and the sum of (n+m) is about 6-100, R.sub.8 is a hydrophobic C.sub.8 -C.sub.40 linear or branched alkyl, alkylaryl, or arylalkyl group, and
• D) from 0 to about 10 weight percent based on total monomers of at least one vinyl carboxylic monomer of the formula:
• R.sub.9 CH.dbd.C(R.sub.10)COOH
• in which R.sub.9 is H and R.sub.10 is H, C.sub.1 -C.sub.4 alkyl, or CH.sub.2 COOY;
• R.sub.9 is COOY, and R.sub.10 is H or CH.sub.2 COOY;
• or R.sub.9 is CH.sub.3 and R.sub.10 is H and Y is H or C.sub.1 -C.sub.4 alkyl.