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AssigneeE. I. Du Pont de Nemours and Company
InventorsPatrick F. McIntyre, Karyn B. Visscher, Kenneth S. Kirshenbaum
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Transparent iron oxide pigment dispersions which produce waterborne coating compositions having excellent transparency and reduced haze are provided. The dispersions contain dispersed pigment, an aqueous carrier, and a mixture of water-dispersible acrylic copolymer dispersants, the mixture containing at least one acrylic copolymer dispersant having acid functional groups, at least one acrylic copolymer dispersant having phosphate functional groups, and optionally at least one acrylic copolymer dispersant having alkyl amino groups and preferably benzyl groups in the pigment anachoring segment. Such pigment dispersions are useful in forming automotive waterborne paints, particularly “metallic” automotive paints.
An aqueous coating composition comprising:
An aqueous pigment dispersion comprising pigment and a mixture of copolymer dispersants consisting essentially of at least one acrylic copolymer dispersant having a hydrophilic stabilizing segment and acid groups in a hydrophobic adsorbing segment and at least one acrylic copolymer dispersant having a hydrophilic stabilizing segment and phosphate groups in a hydrophobic adsorbing segment and optionally at least one acrylic copolymer dispersant having a hydrophilic stabilizing segment and alkyl amino groups in a hydrophobic adsorbing segment.
Dependencies are inferred from the claim text.