Claims
- 1. A thermosetting powder composition comprising
- (A) a carboxyl-terminated polyester consisting essentially of the reaction product of
- (a) an all aliphatic hydroxyl-terminated polyester prepared from 1,4-cyclohexanedicarboxylic acid as the sole acid component and as the alcohol component
- (1) from 10 to 100 equivalent % of a cycloaliphatic diol, and
- (2) from 90 to 0 equivalent % of at least one straight or branched chain aliphatic polyol having 2 to 12 carbon atoms, with
- (b) an aliphatic and/or aromatic dicarboxylic acid or the corresponding anhydride, the amount of 1,4-cyclohexanedicarboxylic acid of the carboxyl-terminated polyester being of from 50 to 90 mole % with respect to the total amount of carboxylic acids, and
- (B) a polyepoxy compound.
- 2. The composition of claim 1, wherein the aliphatic hydroxyl-terminated polyester (a) has a hydroxyl number of from 30 to 220 mg KOH/g and a functionality from 2 to 3.
- 3. The composition of claim 1, wherein the cycloaliphatic diol (1) represents from 30 to 70 equivalent % of the alcohol component.
- 4. The composition of claim 1, wherein the cycloaliphatic diol (1) is selected from the group consisting of hydrogenated bisphenol A, 1,4-cyclohexanedimethanol, 1,4-cyclohexanediol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, 4,8-bis(hydroxymethyl)tricyclo[5.2.1.0.sup.2,6 ]decane and mixtures thereof.
- 5. The composition of claim 1, wherein the aliphatic polyol (2) represents from 30 to 70 equivalent % of the alcohol component.
- 6. The composition of claim 1, wherein the aliphatic polyol (2) is selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, trimethylolpropane, ditrimethylolpropane, trimethylolethane, pentaerythritol, 1,3,5-tris(2-hydroxyethyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione and mixtures thereof.
- 7. The composition of claim 1, wherein the dicarboxylic acid or the corresponding anhydride (b) is selected from the group consisting of succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, maleic acid, fumaric acid, isophthalic acid, succinic anhydride, maleic anhydride and mixtures thereof.
- 8. The composition of claim 7, wherein the dicarboxylic acid (b) is adipic acid or isophthalic acid.
- 9. The composition of claim 1, wherein the carboxyl-terminated polyester has an acid number of from 25 to 70 mg KOH/g and a functionality from 2 to 4.
- 10. The composition of claim 1, wherein the carboxyl-terminated polyester has a number-average molecular weight between 2,000 and 10,000.
- 11. The composition of claim 1, wherein the polyepoxy compound is a solid monomer compound or a solid polymer resin at room temperature, containing on average at least two epoxy groups.
- 12. The composition of claim 1, wherein the polyepoxy compound is triglycidyl isocyanurate.
- 13. The composition of claim 1, wherein the polyepoxy compound is used in an amount of from 0.7 to 1.3 equivalents of epoxy groups per equivalent of carboxyl groups in the carboxyl-terminated polyester.
- 14. The composition of claim 1, wherein the polyepoxy compound is used in an amount of from 0.95 to 1.05 equivalents of epoxy groups per equivalent of carboxyl groups in the carboxyl-terminated polyester.
- 15. The composition of claim 1, further comprising up to 1% by weight with respect to the weight of the polyester of a crosslinking catalyst selected from the group consisting of amines, phosphines, ammonium salts and phosphonium salts.
- 16. The composition of claim 15, wherein the crosslinking catalyst is ethyltriphenylphosphonium bromide.
- 17. The composition of claim 1, further comprising up to 10% by weight with respect to the weight of the polyester of at least one stabilizer selected from the group consisting of ultraviolet light absorbing compounds, sterically hindered amines, phenolic antioxidants and phosphonite or phosphite type compounds.
Priority Claims (1)
Number |
Date |
Country |
Kind |
92870044 |
Mar 1992 |
EPX |
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Parent Case Info
This application is a division of application Ser. No. 08/028,159, filed Mar. 9, 1993 (now U.S. Pat. No. 5,439,988).
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2140440 |
Nov 1984 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Johnson et al., Proc. Water-Borne, Higher-Solids Powder Coat Sump. 6-8 Feb., 1991, pp. 65-77. |
Divisions (1)
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Number |
Date |
Country |
Parent |
28159 |
Mar 1993 |
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