Patent ID: 7695770

Claim:
A multi-stage aqueous emulsion polymer comprising a first polymer having a calculated Hansch parameter >2.0, the first polymer comprising, as copolymerized units, 0.5-5 wt. % acid monomer, based on the weight of said first polymer, and a second polymer comprising, as copolymerized units, from zero to less than half the wt. % of acid monomer in said first polymer, based on the weight of said second polymer, wherein said first polymer and said second polymer, independently, comprise less than 0.1 wt. %, based on the weight of said polymer, of a copolymerized multi-ethylenically unsaturated monomer, wherein said second polymer is from 50% to 85% of the total weight of said first polymer and said second polymer, and wherein the difference between the calculated Tgs of said first and said second polymer is from 0° C. to less than 10° C.