Patent ID: 7306700

Claim:
A cationic vinyl addition polymer comprising in polymerized form (a) at least one non-ionic monomer having a non-aromatic hydrophobic monomer; (b) at least one cationic monomer; and (c) (meth)acrylamide; wherein the cationic vinyl addition polymer is prepared from a monomer mixture comprising from 75 to 95 mole % of (meth)acrylamide; (a) said at least one non-ionic monomer having a non-aromatic hydrophobic group comprises an acrylamide-based monomer selected from the group consisting of N-n-propyl(meth)acrylamide and N-isopropyl(meth)acrylamide; (b) said at least one cationic monomer comprises a cationic monomer selected from the group consisting of: (i) cationic monomers represented by the general formula (I): wherein R 1 is H or CH 3 ; R 2 and R 3 are each H or an alkyl group having from 1 to 3 carbon atoms; A is O or NH; B is an alkylene group of from 2 to 4 carbon atoms or a hydroxy propylene group; R 4 is a non-aromatic hydrocarbon group containing from 4 to 8 carbon atoms; and X − is an anionic counterion; (ii) cationic monomers represented by the general formula (III): wherein R 1 is H or CH 3 ; R 2 and R 3 are each H or an alkyl group having from 1 to 3 carbon atoms; A is O or NH; B is an alkylene group of from 2 to 4 carbon atoms, or a hydroxy propylene group; R 7 is H, an alkyl group having from 1 to 3 carbon atoms, a benzyl group or a phenylethyl group; and X is an anionic counterion; (iii) and mixtures thereof.