Powder coating compositions containing glycidyl ester copolymers and carboxyl terminated crosslinking agent
AssigneeFord Motor Company
InventorsSantokh S. Labana, Yun-Feng Chang
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Abstract
Powder coating compositions are disclosed which, exclusive of pigments and other nonreactive components, comprise a coreactive mixture of: (A) a copolymer of between about 8 and about 30 weight percent of a glycidyl ester of a monoethylenically unsaturated acid and between about 92 and about 70 weight percent of other monoethylenically unsaturated monomers, said copolymer having a glass transition temperature in the range of 40.degree. C to 90.degree. C and a number average molecular weight (M.sub.n) in the range of about 2500 to about 8500; and (B) a carboxyl terminated crosslinking agent in the amount of 0.8 to 1.2 carboxyl groups for each epoxy group in the copolymer.
Claims22
A powder coating composition which, exclusive of pigments and other non-reactive components, comprises a coreactable mixture of:
- (A) a copolymer of about 8 to about 30 weight percent of a glycidyl ester of a monoethylenically unsaturated acid and about 92 to about 70 weight percent of other monoethylenically unsaturated monomers, said copolymer having a glass transition temperature in the range of 40.degree. C to 90.degree. C and a molecular weight (M.sub.n) in the range of 2500 to 8500;
- and
- (B) a carboxyl terminated crosslinking agent in an amount ranging from about 0.8 to about 1.2 carboxyl groups for each epoxy group in the copolymer.
A powder coating composition which, exclusive of pigments and other non-reactive components, comprises a coreactable mixture of:
- (A) a copolymer of about 8 to about 30 weight percent of a glycidyl ester of a monoethylenically unsaturated acid and about 92 to about 70 weight percent of other monoethylenically unsaturated monomers, said copolymer having a glass transition temperature in the range of 40.degree. C to 90.degree. C and a molecular weight (M.sub.n) in the range of 2500 to 8500;
- and
- (B) a carboxyl terminated crosslinking agent in an amount ranging from about 0.8 to about 1.2 carboxyl groups for each epoxy group in the copolymer, said crosslinking agent being selected from the group consisting of:
- (1) carboxyl terminated epoxy esters;
- (2) mixtures of carboxyl terminated epoxy esters and a saturated, aliphatic monocarboxylic acid comprising up to 10 percent by equivalent weight of the mixture;
- (3) carboxyl terminated polyesters;
- (4) carboxyl terminated polybutadiene, (5) carboxyl terminated random copolymers of butadiene and acrylonitrile;
- (6) saturated, aliphatic dicarboxylic acids containing 4 to 20 carbon atoms;
- (7) mixtures of 90 to 98 percent by equivalent weight of a saturated, aliphatic dicarboxylic acid containing 4 to 20 carbon atoms and 2 to 10 percent by equivalent weight of a saturated, aliphatic monocarboxylic acid containing 10 to 22 carbon atoms.
Dependencies are inferred from the claim text.