Patent ID: 7629410

Claim:
A latex comprising: a plurality of polymeric particles, where the particles include from about 50 to about 90 weight percent of particle population A and from about 10 to about 50 weight percent of particle population B, based upon the total weight of particles, where at least one of (i) particle population A and (ii) particle population B is derived from monomers comprising styrene, butadiene, and itaconic acid, where the particles of population A have a particle size of greater than 120 nanometers, and the particles of population B have a particle size of less than 120 nanometers, where at least some of the polymer particles contain acid functionality, and where the milliequivalents of acid functionality per 100 grams of population B is greater than the milliequivalents of acid functionality per 100 grams of population A.