Urethane polyol precursors for coating compositions
AssigneePPG Industries Ohio, Inc.
InventorThomas G. Rukavina
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Abstract
Unsymmetrical polyurethane polyol prepolymers are disclosed for use in the formation of coating compositions. The prepolymers are prepared as a reaction product of a diisocyanate with a short chain aliphatic diol and a long chain polymeric diol. The prepolymers are intended as the first component for reaction with a second component polyisocyanate in a two-component coating composition. The coating compositions exhibit excellent abrasion resistance and weatherability, and are particularly useful as coatings for polymeric window transparencies.
Claims8
A trimeric unsymmetrical polyurethane polyol comprising the reaction product of:
- a) a diisocyanate;
- b) a linear aliphatic diol having 1-6 carbon atoms;
- and
- c) a linear polymeric diol having at least one oxycarbonyl linkage and having from 5-20 carbon atoms,
- wherein the ratio of diisocyanate:aliphatic diol:polymeric diol is from about 1:1.9:0.1 to about 1:1.1:0.9;
- wherein the polyurethane polyol consists of hydroxyl termination.
Dependencies are inferred from the claim text.