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US 7,803,858 B2Granted
Anti-flocculant coating composition
AssigneeRohm and Haas Company
InventorsOzzie Moore Pressley, Wei Zhang
Life of this patent
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Abstract
An aqueous composition containing pigment and an acrylic polymer and having reduced flocculation of pigment particles.
Claims7
An aqueous composition comprising:
- (a) titanium dioxide particles;
- (b) particles of acrylic polymer containing phosphate or phosphonate groups;
- and
- (c) at least one alkali metal or ammonium pyrophosphate;
- wherein phosphate- or phosphonate-containing monomer units comprise from 1 to 5% by weight of a total amount of the acrylic polymer on a solids basis;
- and
- wherein a molar ratio of the alkali metal or ammonium pyrophosphate to the phosphate or phosphonate functional groups on the acrylic polymer is from 1:0.5 to 1:4.
4 more elements
Dependencies are inferred from the claim text.