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Polymeric pigment dispersant having an acrylic backbone, polyester side chains, cyclic imide groups and quaternary ammonium groups

  • US 6,037,414 A
  • Filed: 09/02/1998
  • Issued: 03/14/2000
  • Est. Priority Date: 09/02/1998
  • Status: Expired due to Term
First Claim
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1. A polymeric pigment dispersant comprising a graft polymer having an acrylic polymer backbone and pending from the backbone, polyester side chains, cyclic imide groups and quaternary ammonium groups and the polymer having a calculated number average molecular weight of 8,000-50,000;

  • wherein the graft copolymer consists essentially of(a) 10-50%, by weight of the of the graft polymer, of an acrylic copolymer backbone having a number average molecular weight of 2,500-10,000 which, before reaction, contains 25-75% by weight of polymerized oxirane containing monomers;

    (b) 20-85%, by weight of the graft polymer, of a polyester copolymer, or mixture of different polyester copolymers, having a number average molecular weight of 500-10,000 which polyester copolymer is carboxylic-acid functional and attached to the backbone by a reaction of the carboxylic acid functional groups with oxirane groups of the backbone;

    (c) 1-16%, by weight of the graft polymer, of cyclic imide groups attached to the backbone by a reaction on the imide groups with the oxirane groups of the backbone and(d) 0.2-17%, by weight of the graft polymer, of quaternary ammonium groups.

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