Patent ID: 8802765

Claim:
An aqueous copolymer dispersion comprising: an emulsion copolymer, wherein the emulsion copolymer comprises, as a copolymerized unit, based on the dry weight of the copolymer, at least 90 wt % an ethylenically unsaturated nonionic monomer, and up to 10 wt % an ethylenically unsaturated stabilizer monomer, and wherein the emulsion copolymer is not a multi-stage emulsion copolymer comprising at least two stages; and two hydrophobic aromatic ketones, wherein the aromatic ketones are, based on the dry weight of the copolymer, from 0.6 to 3 wt % benzophenone and from 0.5 to 3 wt % of a benzophenone derivative; and wherein the dispersion comprises 0 or less than 0.1 wt % hydrophilic aromatic ketone.