Patent ID: 6239227
Filing Date: 2001-05-29
Classification: C08F,Y10S

Abstract:
Water-soluble or water-dispersible grafted copolymers comprising:(a) one or more oligomeric or macromolecular units chosen from(i) oxyalkylene oligomers or polymers, in which the oxyalkylene repeating units are the same or different, the alkylene residue being linear or branched and containing from 2 to 4 carbon atoms, said oligomers or polymers having an overall degree of polymerization of 2 to 3000;(ii) vinylpyrrolidone polymers or copolymers having a molecular mass of about 5000 to 1,000,000, and optionally containing up to 50 mol % of units derived from at least one comonomer;(iii) polyvinyl alcohols having a molecular mass of about 5000 to 1,000,000; and(b) one or more hydrophilic macromolecular units chosen from those derived from random copolymers obtained from the polymerization of at least one anionic, water-soluble, ethylenically unsaturated monomer and of at least one amphoteric, water-soluble, ethylenically unsaturated monomer, the amount of units derived from said amphoteric, ethylenically unsaturated monomers representing from 1 to 50% of the weight of said random copolymer;said grafted copolymers being formed either of a trunk comprising said one or more oligomeric or macromolecular units and of one or more grafts comprising said one or more hydrophilic macromolecular units or of a trunk comprising said one or more hydrophilic macromolecular units and of one or more grafts comprising said one or more oligomeric or macromolecular units.