Polymeric pigment dispersant having an acrylic backbone, polyester side chains, cyclic imide groups and quaternary ammonium groups
First Claim
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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Abstract
A polymeric pigment dispersant of 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 is composed of
(a) 10-50%, by weight of the of the graft polymer, of an acrylic copolymer backbone having a number average molecular weight of 2500-10,000 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 is attached to the backbone by a reaction of the carboxylic acid functional group with oxirane group of the backbone;
(c) 1-16%, by weight of the graft polymer, of cyclic imide groups attached to the backbone by a reaction of the imide group with the oxirane group of the backbone and
(d) 0.2-17%, by weight of the graft polymer, of quaternary ammonium groups.
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Citations
15 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- wherein the graft copolymer consists essentially of
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15. A method of making a dispersant comprised of a graft polymer having a calculated number average molecular weight of 8,000-50,000 and having an acrylic polymer backbone and pending from the backbone, polyester side chains, cyclic imide groups and quaternary ammonium groups comprising simultaneously reacting:
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(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 to 10,000 which polyester copolymer is carboxylic-acid functional; (c) 1-16%, by weight of the graft polymer, of cyclic imide groups and (d) 0.2-17%, by weight of the graft polymer, of a precursor of a quaternary ammonium group and subsequently quaternizing said precursor to form quaternary ammonium group.
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Specification