Claims
- 1. A thermosetting powder coating composition comprising:
- (1) a co-reactable particulate mixture of:
- (a) from 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## where 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; and
- (2) a crystalline carboxylic acid group-containing material selected from the group consisting of an aliphatic polycarboxylic acid containing from 4 to 20 carbon atoms, a polymeric polyanhydride other than carboxylic acid group-containing polymer (a), a polyester other than carboxylic acid group-containing polymer (a), having a number average molecular weight from about 300 to about 1,500 and an acid equivalent weight of from about 150 to about 750, and mixtures thereof
- 2. The composition of claim 1 wherein the carboxylic acid group-containing polymer is an acrylic polymer having a number average molecular weight from about 1,500 to about 15,000.
Parent Case Info
This is a division of application Ser. No. 07/139,489 filed Dec. 30, 1987, now U.S. Pat. No. 4,889,890.
US Referenced Citations (7)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0637646 |
Mar 1962 |
CAX |
0897985 |
Jun 1962 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Lomax and Smith, "B-Hydroxyalkylamides, Low Polluting Crosslinkers for Carboxyl Containing Polymers," Journal of Coatings Technology, vol. 50, No. 643, Aug. 1978, pp. 49-55. |
Divisions (1)
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Number |
Date |
Country |
Parent |
139489 |
Dec 1987 |
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