Patent ID: 6225395
Filing Date: 2001-05-01
Classification: C02F,C08F

Abstract:
Dispersant for an aqueous dispersion of a water-soluble polymer, said dispersant comprising:(a) from 15 to 99 mol % of units derived by polymerization of at least one water-soluble monomer A selected from the group consisting of(i) the monomers containing amine or quaternary ammonium functions and corresponding to the formula: ##STR10##in whichR.sub.1 =H or CH.sub.3,Z.sub.1 =O, NH or NR.sub.2 with R.sub.2 being C.sub.1 -C.sub.6 alkyl or hydroxyalkyl group ##STR11##where R.sub.3 =C.sub.1 -C.sub.6 alkylene or hydroxyalkylene; L.sub.1, L.sub.2 and L.sub.3 independently represent an H, a C.sub.1 -C.sub.6 alkyl or hydroxyalkyl, a C.sub.5 -C.sub.12 cycloalkyl, a C.sub.6 -C.sub.12 aryl or alkylaryl; and X is a monovalent ion;(ii) the monomers containing carboxylic acid functions; and(iii) C.sub.1 -C.sub.6 (meth)acrylamides, N-alkylacrylanides and N,N'-dialkyl (meth)acrylamides;(b) from 1 to 85 mol % of units derived by polymerization of at least one hydrophobic monomer B selected from the group consisting of (i) ethylenic, vinyl and C.sub.1 -C.sub.32 alkyl (meth)acrylate monomers and diene monomers, and (ii) fluoro monomers; and(c) from 0 to 30 mol % of residues of at least one amphiphilic monomer C;wherein said water-soluble polymer has a monomeric composition different from that of said dispersant.