Patent ID: 7091273

Claim:
An aqueous polymer dispersion comprising: (a) a dispersed polymer, and, (b) a dispersant polymer which is a co-polymer of a monomer mixture (M) comprising at least one cationic vinyl monomer (m 3 ) and at least one monomer (m 4 ) which is tetrahydrofurfuryl acrylate, tetrahydrofurfuryl methacrylate, or a monomer of the general formula (I): wherein R 1 is hydrogen or methyl, R 2 is hydrogen or C 1 –C 2 alkyl, R 3 is hydrogen, C 1 –C 4 alkyl, phenyl, or benzyl, n=1 to 4, and x=1 to 50, and, (c) a salt, the monomer mixture (M) including 0.5 wt % or less of monomers which are not soluble in water.