Patent ID: 7408003

Claim:
A polymer composition comprising: organic colorant particles; and polymer particles comprised of polymerized units of phosphorus acid monomer and having first phosphorus acid groups, wherein: i) said polymer particles are prepared by aqueous emulsion polymerization of said phosphorus acid monomer at a pH of less than 2, or ii) said polymer composition comprises a level of water soluble polymer having second phosphorus acid groups defined by ratios of equivalents of second phosphorus acid groups to equivalents of first phosphorus acid groups in the range of less than or equal to 1.5, wherein each of said polymer particles are multistage polymer particles comprising: a) a first polymer comprising: a polymerized unit of a multiethylenically unsaturated monomer, polymerized units of said phosphorus acid monomer, and said first phosphorus acid groups, wherein said first polymer has a glass transition temperature in the range of from −60° C. to 35° C.; and b) a second polymer having a glass transition temperature in the range of from −60° C. to 35° C., wherein a weight % of the first phosphorus acid groups in said second polymer, based on a weight of said second polymer, is 10 weight % or less of a weight % of the first phosphorus acid groups in said first polymer, based on a weight of the first polymer and wherein the average weight ratio of said first polymer to said second polymer is in the range of from 1:2 to 1:20.