Patent ID: 7544733

Claim:
A water-borne domestic household paint composition comprising an anionically stabilised dispersion polymerised from: a) a carboxylic acid containing ethylenically unsaturated monomer selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof; b) a hydrophobic aromatic ethylenically unsaturated high glass transition temperature (“Tg”) monomer selected from the group consisting of styrene and alpha methyl styrene; and c) a C 2 -C 12 acrylate ester monomer; wherein the relative proportions of ethylenically unsaturated monomers are selected such that the following Equation I is satisfied: a = 5 + b ( c + d / 2.4 ) 2 ( I ) where a=2-3 b=weight percent hydrophobic aromatic high Tg monomer c=weight percent acrylic acid d=weight percent methacrylic acid, wherein the polymeric dispersion has a Tg of between −15° C. and 30° C., and wherein the paint composition has the following properties: (i) stain resistance of at least 3 as measured on a scale of 1-5 relative to an appropriate control sample comprising a paint class similar to that of said paint composition being measured using the scale, (ii) tint strength of at least 4 as measured on a scale of 1-5 where 1 is poor, being more than 20% low in tint strength, and, 5 is excellent, being less than 5% low in tint strength relative to a stored color reference having a defined and predetermined color, and (iii) viscosity stability of at least 3 as measured on a scale of 1-5 at a pH of between about 8.5 and about 9.5, where 1 is poor when the low shear viscosity increased by more than 100% and 5 is excellent when the low shear viscosity increased by less than 20%.