Patent ID: 6846867

Claim:
An aqueous coating composition having improved adhesion to friable surfaces comprising: (a) an emulsion polymer having a glass transition temperature of −20° C. to 100° C. and an average particle diameter less than 120 nanometers, said emulsion polymer consisting essentially of: (i) at least one copolymerized ethylenically unsaturated nonionic monomer, each of said nonionic monomer(s) having a water solubility less than 8% by weight based on the weight of water; and (ii) at least one copolymerized acid monomer, such that the acid number of said emulsion polymer is 30 to 100; wherein said emulsion polymer is made without the use of chain transfer agent; and (b) 0.25-10%, by dry weight based on the dry weight of said emulsion polymer, nonionic surfactant selected from the group consisting of water-soluble alkyl phenol ethoxylates, alkyl alcohol ethoxylates, and mixtures thereof.