Appeal No. 1997-2330 Page 2
Application No. 08/398,315
1. A method for extending the open time of an aqueous coating composition comprising:
a) forming an aqueous coating composition comprising at least one film-forming
latex polymer formed from at least one ethylenically-unsaturated monomer, said film- forming
polymer having a glass transition temperature in the range of from -15EC to +50EC;
b) admixing with said aqueous coating composition:
at least one aqueous-based polyurethane dispersion having a glass
transition temperature less than the glass transition temperature of the latex
polymer, said polyurethane dispersion being non-reactive with said film-forming
latex polymer; and
at least one water soluble coalescent;
b) applying said aqueous coating composition to an architectural substrate; and
c) drying said aqueous coating composition at temperatures in the range of from
0EC to 40EC.
wherein said aqueous coating composition is free from water-insoluble
coalescents.
4. An aqueous coating composition having extended open time comprising:
a) at least one film-forming latex polymer formed from at least one ethylenically-
unsaturated monomer, said film-forming polymer having a glass transition temperature in
the range of from -15EC to +50EC;
b) at least one aqueous-based polyurethane dispersion having a glass transition
temperature less than the glass transition temperature of the film-forming latex polymer,
wherein said aqueous-based polyurethane dispersion is non-reactive with said film-forming
latex polymer;
c) at least one water soluble coalescent;
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