Patent ID: 7169846
Filing Date: 2007-01-30
Classification: C08F,C09J

Abstract:
1. A pressure sensitive adhesive composition having enhanced resistance to water-whitening comprising an aqueous emulsion polymer, said polymer comprising the polymerization reaction product of a polymerizable aqueous emulsion comprising: (i) at least one hydrophobic alkyl acrylate or alkyl methacrylate ester of an alcohol, (ii) at least about 1 wt. % of at least one hydrophilic monomer, (iii) at least about 5 wt. % of at least one partially hydrophilic alkyl acrylate or alkyl methacrylate ester of an alcohol, and (iv) a water-soluble or water-dispersible polymerizable surfactant selected from polyoxyalkylene-1-(allyloxymethyl) alkyl ether sulfate salts, wherein the wt. % of monomers (i), (ii) and (iii) are based on the total weight of monomers (i), (ii) and (iii) in said emulsion; wherein after said polymerization the pH of said polymer is adjusted to a pH of about 6.5 to about 9, and the average particle size of said polymer is less than or equal to 200 nm.