Coating compositions having improved stability
AssigneeLubrizol Advanced Materials, Inc.
InventorsShui-Jen Raymond Hsu, Tina R. Dame, Prashant Patel
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Abstract
This invention relates to waterbone coating compositions having improved compatability with metal pigments, i.e., improved shelf life and reduced gassing and gellation. The composition comprise at least one aqueous dispersion of (1) at least one emulsion copolymer polymerized from (a) at least one ethylenically unsaturated anionic monomer and (b) at least one other olefinically unsaturated monomer, said copolymer being made using at least one phosphate surfactant having at least one phosphorus acid group or salt thereof, said copolymer being crosslinked, and (2) at least one non-water soluble metal pigment. The compositions are useful in paints and other coatings.
Claims19
A composition comprising:
- An aqueous dispersion of (1) at least one emulsion copolymer polymerized from (a) at least one ethylenically unsaturated anionic monomer and (b) at least one other olefinically unsaturated monomer, said monomers being polymerized in the presence of at least one phosphate ester surfactant having at least one phosphate group or salt thereof, said copolymer optionally being crosslinked, and (2) at least one non-water soluble metal pigment.
A composition according to clalin 5, wherein said metallic pigment is in flake or powder form.
A method for making a pigmented aqueous dispersion comprising:
- (a) providing an emulsion copolymer polymerized from (i) at least one ethylenically unsaturated anionic monomer and (ii) at least one other olefinically unsaturated monomer in the presence of at least one phosphate ester surfactant having at least one phosphate group or salt thereof;
- and
- (b) combining said copolymner with at least one non-water soluble metal pigment.
Dependencies are inferred from the claim text.