Graft copolymer pigment dispersant
AssigneeE. I. Du Pont de Nemours and Company
InventorSheau-Hwa Ma
Life of this patent
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Abstract
A polymer dispersant for pigments based on an acrylic graft copolymer wherein the graft copolymer has a weight average molecular weight of at least 3000 and has 10 to 90% by weight of a polymeric backbone and 90 to 10% by weight of macromonomer side chains attached to the backbone and wherein the graft copolymer has at least about 1% by weight of a pigment anchoring group selected from the group consisting of an aromatic ester group, aromatic amine group, and quaternary ammonium group, or mixtures thereof, attached to the backbone or the macromonomer. These materials disperse a wide variety of pigments and are useful in solvent borne coatings where they can provide improved efficiency of pigment use, lower paint viscosity, and reduced emission of volatile organic solvent.
Claims16
A composition suitable for use as a pigment dispersant, comprising a graft copolymer having a macromonomer grafted onto a polymer backbone, wherein the macromonomer and backbone are formed from polymerized ethylenically unsaturated monomers, and wherein the graft copolymer has attached to either the backbone or macromonomer, a pigment anchoring group selected from the group consisting of an aromatic ester, aromatic amine, and quaternary ammonium group, or mixtures thereof.
A graft copolymer composition suitable for use as a pigment dispersant, comprising about:
- a) 10 to 90% by weight, based on the weight of the graft copolymer, of a polymer backbone formed from polymerized ethylenically unsaturated monomers;
- b) 90 to 10% by weight, based on the weight of the graft copolymer, of a macromonomer formed from polymerized ethylenically unsaturated monomers grafted onto said backbone,
- wherein the graft copolymer contains at least about 1% by weight of a pendant pigment anchoring group selected from the group consisting of an aromatic ester, aromatic amine, and quaternary ammonium group, or mixtures thereof, attached to either the backbone or macromonomer.
Dependencies are inferred from the claim text.