Claims
- 1. A thermosetting composition comprising
- (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 40 mole percent of the acid moiety being a terephthalic or isophthalic acid moiety, said polyester containing as moieties of the dihydric alcohol at least 40 mole percent 1,6-hexanediol, said polyester being further characterized as having a molecular weight of about 700-3000, a melt viscosity of about 50-3000 cps at 160.degree. C. and a hydroxyl number of about 35-160, and
- (b) from about 10 to about 40%, based on the weight of said polyester, of a curing agent which is reactive with hydroxyl groups to crosslink said polyester.
- 2. A thermosetting composition comprising
- (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 40 mole percent of the acid moiety being a terephthalic acid moiety, said polyester containing as moieties of the dihydric alcohol at least 40 mole percent 1,6-hexanediol, said polyester being further characterized as having a molecular weight of about 1000-2000, a melt viscosity of about 50-1000 cps at 160.degree. C. and a hydroxyl number of about 50-125, and
- (b) from about 10 to about 40%, based on the weight of said polyester, of a curing agent which is reactive with hydroxyl groups to crosslink said polyester.
- 3. A composition according to claim 1 wherein said polyester contains moieties of at least one other glycol selected from the group consisting of ethylene glycol, 1,4-butaneidol, neopentyl glycol and 1,4-cyclohexanedimethanol.
- 4. A composition according to claim 2 wherein the glycol is 1,4-butanediol.
- 5. A composition according to claim 1 wherein the molecular weight of said polyester is about 1000-2000.
- 6. A composition according to claim 1 wherein the hydroxyl number of said polyester is about 50-125.
- 7. A composition according to claim 1 wherein said curing agent is selected from the group consisting of blocked isocyanates and melamines.
- 8. A composition according to claim 6 wherein said curing agent is an alkoxymelamine wherein the alkoxy group contains from 1 to 8 carbon atoms.
- 9. A composition according to claim 1 which further contains a catalyzingamount of an acid catalyst.
- 10. A composition according to claim 8 wherein said catalyst is present in an amount of from about 0.01 to about 5%, based on the weight of the polyester.
- 11. A composition according to claim 1 in particulate form of a size suitable for coating as a powder.
- 12. A composition according to claim 8 in particulate form of a size suitable for coating as a powder.
- 13. A thermosetting powder composition comprising
- (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 40 mole percent of the acid moiety being a terephthalic acid moiety, said polyester containing as moieties of the dihydric alcohol at least 40 mole percent 1,6-hexanediol and a second glycol selected from the group consisting of ethylene glycol, 1,4-butanediol, neopentyl glycol and 1,4-cyclohexanedimethanol, said polyester being further characterized as having a molecular weight of about 1000-2000, a melt viscosity of about 50-1000 cps at 160.degree. C. and a hydroxyl number of about 50-125,
- (b) from about 10 to about 40%, based on the weight of said polyester of a curing agent which is reactive with hydroxyl groups to crosslink said polyester, and
- (c) a catalyzing amount of an acid catalyst.
Parent Case Info
This application is a division of Ser. No. 278,228, filed June 29, 1981, now U.S. Pat. No. 4,387,214.
US Referenced Citations (5)
Number |
Name |
Date |
Kind |
3185669 |
McKinney |
May 1965 |
|
3907733 |
Jackson, Jr. et al. |
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|
4094721 |
Sturm et al. |
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4197353 |
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4375539 |
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|
Non-Patent Literature Citations (1)
Entry |
Chemical Abstracts, 90:40330x, 1979. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
278228 |
Jun 1981 |
|