Patent Number: 6,294,619

Title: Stable powder coating compositions which produce consistent finishes

Abstract: The invention provides powder coatings that consistently produce durable finishes when cured, and are stable when uncured. These powder coatings of the invention include novel film forming systems. The novel film forming system, in turn, includes a polymer component and a crosslinker component. In one embodiment, the polymer component is novel; and, in another embodiment, both the polymer and crosslinker components are novel. The novel polymer component includes a novel polyester polyol. This novel polyester polyol includes the reaction product of a cycloaliphatic component and a polyfunctional isocyanurate component. The novel crosslinker component which can be used when practicing certain embodiments of this invention includes a novel, polyfunctional isocyanate compound which is at least partially blocked with at least one of the following: a polyhydroxy aromatic compound, or a mixture of a polyhydroxy aromatic compound and a hydroxy-functional ester compound.

Inventors: Chasser; Anthony M. (Glenshaw, PA), Ambrose; Ronald R. (Allison Park, PA), Greigger; Barbara A. (Cranberry Township, PA), Retsch; William H. (Castle Shannon, PA)

Assignee: PPG Industries Ohio, Inc.

International Classification: C08G 18/46 (20060101); C08G 18/00 (20060101); C09D 167/02 (20060101); C08G 18/80 (20060101); C09D 167/02 (); C09D 175/06 ()

Expiration Date: 09/25/2018