Patent ID: 7160945

Claim:
A film-forming composition comprising a continuous aqueous phase and a dispersed phase, the dispersed phase comprising (i) a particulate polymer or emulsified liquid prepolymer, and (ii) a coalescent aid comprising an ester derived from a fatty acid of an oil of plant or animal origin, the ester having the formula RCOOX wherein R is hydrocarbyl or substituted hydrocarbyl and comprises at least two unsaturated carbon—carbon bonds and X is —C 2 H 4 OH, —C 2 H 4 OC 2 H 4 OH, —C 3 H 6 OH, or —C 3 H 6 OC 3 H 6 OH, whereby air oxidation of the coalescent aid causes an increase in the glass transition temperature of a film of the composition when the film is cured in the presence of air.