Patent ID: 8877852

Claim:
An aqueous composition comprising an inorganic particle; an organic polymer comprising phosphorous acid groups at a level of >0.25% phosphorus by weight based on the weight of said organic polymer, said phosphorus acid groups being separated from the backbone of said organic polymer by no more than 2 alkylene glycol units, said organic polymer having an acid number of from 50 to 1,000, and said organic polymer having a Mw of from 2,000 to 20,000, wherein said organic polymer has been formed by emulsion polymerization from at least one ethylenically unsaturated monomer; wherein said organic polymer is present at a level of from 0.2 to 10% by weight based on the weight of said inorganic particle; and an emulsion polymer comprising from 0.05% to 2% phosphorous, present as pendant phosphorous acid groups, by weight based on the weight of said emulsion polymer, wherein said organic polymer is present at a level of from 0.1% to 50% by weight based on the total weights of said organic polymer and said emulsion polymer; wherein said inorganic particle in an aqueous medium has been first contacted with said organic polymer and subsequently said emulsion polymer has been added to form said aqueous composition; and wherein the pH of said aqueous composition is in the range of from 3 to 11.