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US 5,710,214 AGranted
Thermosetting powder coating compositions
AssigneePPG Industries, Inc.
InventorsChun-Tzer Chou, Robert B. Barbee
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Abstract
Provided are novel thermosetting powder coating compositions which are useful for coating metal articles and protecting such articles from acidic corrosion. The compositions are comprised of an epoxy containing acrylic copolymer crosslinked with both an aliphatic dibasic acid and a blocked polyisocyanate.
Claims26
A powder coating composition comprising:
- A. about 55 to 71 weight percent of a glycidyl functionalized acrylic copolymer comprised of:
- 1. about 10 to 40 percent by weight, based on the weight of the copolymer, of a monoethylenically unsaturated monomer having at least one epoxy group, and
- 2. about 60 to 90 percent by weight, based on the weight of the copolymer, of at least one monoethylenically unsaturated monomer which is free of epoxy groups, wherein the copolymer has a number average molecular weight of about 1,000 to 8,000, a weight average molecular weight of about 2,000 to 16,000 and a glass transition temperature of 40.degree. C. to 90.degree. C., and
- B. about 9 to 14 weight percent of an aliphatic carboxylic acid having 2 or 3 carboxylic acid groups per molecule, and
- C. about 17 to 34 weight percent of a blocked polyisocyanate where the weight percents of A, B and C are based upon the total weight of A, B and C.
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A method for protecting a metal article from acidic corrosion, which comprises applying a powder coating composition comprising:
- A. about 55 to 71 weight percent of a glycidyl functionalized acrylic copolymer comprised of
- 1. about 10 to 40 percent by weight, based on the weight of the copolymer, of a monoethylenically unsaturated monomer having at least one epoxy group, and
- 2. about 60 to 90 percent by weight, based on the weight of the copolymer, of at least one monoethylenically unsaturated monomer which is free of epoxy groups, wherein the copolymer has a number average molecular weight of about 1,000 to 8,000, a weight average molecular weight of about 2,000 to 16,000 and a glass transition temperature of 40.degree. C. to 90.degree. C., and
- B. about 9 to 14 weight percent of an aliphatic carboxylic acid having 2 or 3 carboxylic acid groups per molecule, and
- C. about 17 to 34 weight percent of a blocked polyisocyanate where the weights of A, B and C are based upon the total weight of A, B and C;
- following by heat-curing the coated article.
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Dependencies are inferred from the claim text.