Method of curing B-stage polyurethanes
AssigneePPG Industries, Inc.
InventorWen-Hsuan Chang
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Abstract
B-stage polyurethanes comprising the reaction product of at least one hydroxyl-containing ester having a terminal acrylyl or alpha-substituted acrylyl group, an organic diisocyanate and a polyester polyol, are cured by ionizing radiation or actinic light to provide hard, thermoset polyurethanes. The composition may include one or more copolymerizable ethylenic monomers. The method is useful to provide films, coatings and impregnated materials of highly desirable properties.
Claims11
A method of producing a cured polyurethane which comprises subjecting a layer of a curable polyurethane composition to ionizing radiation or actinic light sufficient to cure said layer, said curable polyurethane composition consisting essentially of
- A. the reaction product of
- a. a polyester polyol,
- b. an organic isocyanate, and
- c. a hydroxyl-containing ester having a terminal acrylyl or alpha-substituted acrylyl group,
- wherein the number of isocyanate groups of the reactants is not greater than the number of hydroxyl groups of the reactants;
- and
- B. up to 25 percent based on the total weight of (A) and (B) of a radiation-sensitive monoethylenically unsaturated monomer.
Dependencies are inferred from the claim text.