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US 4,889,890 AGranted
Powder coating curing system containing a beta-hydroxyalkylamide
AssigneePPG Industries, Inc.
InventorsPaul R. Kerr, Paul H. Pettit, Jr., William S. Ewing
Life of this patent
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Abstract
The thermosetting powder coating composition which has good stability and good physical properties, such as appearance, flexibility, hardness, solvent resistance and corrosion resistance, is disclosed. The composition comprises a co-reactable particulate mixture of a carboxylic acid group-containing polymer, a polyepoxide, and a beta-hydroxylalkylamide.
Claims5
A thermosetting powder coating composition comprising a co-reactable particulate mixture of:
- (a) about 35 to about 85 percent by weight based on weight of resin solids of a carboxylic acid group-containing polymer having a Tg in the range of about 35.degree. C. to 100.degree. C.;
- (b) from about 2 to about 45 percent by weight based on weight of resin solids of a polyepoxide having a 1,2-epoxy equivalency of greater than 1.0;
- and
- (c) a beta-hydroxyalkylamide of the structure:
- ##STR4## where R.sub.1 is H or C.sub.1 -C.sub.5 alkyl;
- R.sub.2 is H, C.sub.1 -C.sub.5 alkyl or ##STR5## wherein R.sub.1 is as described above and A is a chemical bond or monovalent or polyvalent organic radical derived from saturated, unsaturated or aromatic hydrocarbon radicals including substituted hydrocarbon radicals containing from 2 to 20 carbon atoms, m equals 1 to 2, n equals 0 to 2 and m+n is at least 2, and the equivalent ratio of beta-hydroxyalkylamide equivalents plus epoxy equivalents to carboxylic acid equivalents being within the range of 0.6 to 1.6:1.
3 more elements
Dependencies are inferred from the claim text.