Patent ID: 7750074

Claim:
An aqueous latex paint which comprises a mixture of a tint base and a colorant composition containing at least one pigment, water, and a copolymer surfactant having a number average molecular weight of from about 400 Daltons to about 200,000 Daltons, and wherein the copolymer surfactant comprises the following monomers (a) from about 10% to about 80% by weight of at least one C 3 -C 12 α,β-ethylenically unsaturated carboxylic acid or anhydride, (b) from about 10% to about 80% by weight of at least one C 2 -C 12 α,β-ethylenically unsaturated vinyl monomer, and (c) from about 0.01% to about 20% by weight of at least one surfactant monomer, wherein each said surfactant monomer is either an acrylic or methacrylic ester moiety joined with a hydrophobic moiety which is styrylphenyl by a bridging group consisting essentially of a poly(ethyleneoxy) moiety, the Stormer low-shear viscosity of said paint, its formation by mixing of the colorant composition with the tint base notwithstanding, being within about ±10% of the Stormer low-shear viscosity of the tint base.