Extensible coatings
AssigneePPG Industries, Inc.
InventorsWen-Hsuan Chang, Marvis E. Hartman
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Abstract
Cured coatings having a high degree of extensibility and other desirable properties are obtained from compositions comprising a hydroxyl-containing, urethane reaction product containing a polyester component and an amine-aldehyde resin. Preferred compositions contain a polymeric polyol of low glass transition temperature. These compositions are storage-stable in one package, and the cured coatings are adherent, durable and highly extensible. These coatings are particularly useful on resilient and rubbery substrates, such as form rubber, polyurethane foam and vinyl foam, and on soft metal surfaces such as mild steel and aluminum.
Claims15
A one-package, storage stable coating composition consisting essentially of:
- an ungelled hydroxyl-containing urethane reaction product of an organic polyisocyanate and a polyhydric material, wherein a major portion of said polyhydric material is a saturated polyester polyol formed from:
- 1. an alcohol component having an average functionality of at least about 1.9, and
- 2. a saturated acid component consisting essentially of one or more monomeric carboxylic acids or anhydrides having 2 to 14 carbon atoms per molecule, said acid component having an average functionality of at least about 1.9;
- said polyhydric material containing a total of not more than one gram-mole of compounds having a functionality of 3 or more per 500 grams of polyhydric material;
- said urethane reaction product having a hydroxyl value of at least 10;
- and,
- B. an amine-aldehyde condensate.
Dependencies are inferred from the claim text.