Claims
- 1. A process for forming a coating on a substrate selected from the group consisting of metal, wood and ceramic, said coating comprising a powdered enamel, said process comprising:
- (a) preparing a powdered enamel comprising an unsaturated, branched hydroxyester resin having a hydroxyl number of about 30-110, said resin comprising the reaction product from the esterification of an unsaturated aliphatic or aromatic dicarboxylic acid with a mixture comprising about 75-97 mole percent of a bivalent alcohol and about 25-3 mole percent of a multifunctional alcohol having at least 3 hydroxy groups;
- (b) applying said enamel to said substrate; and
- (c) heating said powder enamel to its melting point so as to form a continuous coating on said substrate.
- 2. A process according to claim 1 in which said hydroxyl number of said hydroxyester resin is about 40-80.
- 3. A process according to claim 2 in which said resin has an acid number of about 5-40.
- 4. A process according to claim 2 in which said resin has an acid number of about 10-30.
- 5. A process according to claim 2 in which mixtures of saturated or unsaturated aliphatic or aromatic acids are used in the esterification.
- 6. A process according to claim 1 in which a mixture of saturated and unsaturated dicarboxylic acids is used in the esterification, said dicarboxylic acid component comprising about 30-80 mole percent fumaric acid.
- 7. A process according to claim 6 in which the dicarboxylic acid component comprises about 20-70 mole percent of at least one of the three isomers of phthalic acid.
- 8. A process according to claim 7 in which the bivalent alcohol is selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, pentanediol, hexanediol, 1,4-dimethylol-cyclohexane, 2,2'-dimethyl-1,3-propanediol, tricyclodecanedimethylol and 1,4-butanediol, and the multivalent alcohol is selected from the group consisting of glycerin, trimethylolpropane, pentaerythrite, hexanetriol and sorbitol.
- 9. A process according to claim 8 in which the acid is fumaric acid.
- 10. A process according to claim 1 in which said unsaturated acid is an .alpha., .beta.-unsaturated acid.
- 11. A process according to claim 1 in which said acid comprises about 30-80 mole percent fumaric acid and about 20-70% of at least one of the three isomers of phthalic acid.
- 12. A process according to claim 1 in which the unsaturated dicarboxylic acid is in admixture with one or more aliphatic dicarboxylic acids, wherein the total number of carbon atoms in said aliphatic dicarboxylic acids is 6 to 36.
- 13. A process according to claim 12 in which said unsaturated acid is fumaric acid or maleic acid.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2137513 |
Jul 1971 |
DE |
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Parent Case Info
This is a continuation, of application Ser. No. 482,959 filed June 25, 1974, now abandoned, which in turn is a division of application Ser. No. 274,950, filed July 25, 1972, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (4)
Number |
Date |
Country |
1,191,570 |
Apr 1965 |
DE |
1,047,684 |
Nov 1966 |
GB |
927,786 |
Jun 1963 |
GB |
1,255,070 |
Apr 1971 |
GB |
Non-Patent Literature Citations (2)
Entry |
Berger et al, Am. Paint J. 46 (24), 74-84 (1962). |
Boeing, "Unsaturated Polyesters," Elsevier, New York, 1964, pp. 6, 100-102. |
Divisions (1)
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Number |
Date |
Country |
Parent |
274950 |
Jul 1972 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
482959 |
Jun 1974 |
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