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US 5,008,335 AGranted
Powder coating compositions of polyepoxides, acrylic copolymers and aliphatic or polyester dibasic acids
AssigneePPG Industries, Inc.
InventorPaul H. Pettit, Jr.
Life of this patent
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Abstract
A thermosetting powder coating composition and a coated article are disclosed. The composition comprises a coreactable particulate mixture of an acid group-containing acrylic polymer and a compatible epoxy novolac resin and an incompatible epoxy resin. The compositions have a good balance of properties and are useful as coatings for appliance, general industrial and automotive applications.
Claims2
A thermosetting powder coating composition comprising a coreactable particulate mixture of:
- (A) 40 to 80 percent by weight of an acid group-containing acrylic polymer having a glass transition temperature in the range of 40.degree. C. to 100.degree. C., and a number average molecular weight of 1500 to 20,000,
- (B) 5 to 30 percent by weight of an epoxy novolac resin having a number average molecular weight of 500 to 1400 which is compatible with (A), and
- (C) 5 to 30 percent by weight of an epoxy resin which has a number average molecular weight of at least 100 and which is incompatible with (A).
- the percentage by weight of (A), (B) and (C) based on weight of resin solids, and which composition also contains a dibasic acid selected from the class consisting of aliphatic dicarboxylic acids containing from 4 to 20 carbon atoms, a polyester terminated with carboxylic acid groups, and mixtures thereof.
1 more element
Dependencies are inferred from the claim text.