US4740580A
Expired / Lapsed
US
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One-step process for the preparation of carboxyl group-terminated polyesters
Assignee: UCB SA
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Filing: 1987-04-14
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Granted: 1988-04-26
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Expires: 2007-04-14
Abstract
Abstract The present invention provides a process for the preparation of carboxyl group-terminated polyesters, which comprises reacting in one step at elevated temperatures, terephthalic acid and at least one dihydric aliphatic compound and optionally an aromatic polycarboxylic acid having three or more carboxyl groups and/or a polyhydric organic compound having three or more hydroxyl groups and/or a linear aliphatic or cycloaliphatic dicarboxylic acid, the proportions by weight of the respective reactants being such as to produce a polyester having an acid number of from 10 to 25 mg KOH/g and a hydroxyl number of at most 5 mg KOH/g. The present invention also provides a process for preparing a powdered thermosetting coating composition suitable for application as paint or varnish on electricity-conducting articles by electrostatic powder spray methods and fluidized bed coating processes, wherein the carboxyl group-terminated polyester prepared as described above is homogeneously mixed with and epoxy compound containing at least two epoxy groups. The present invention further provides the compositions thus prepared.
Inventors
- 👤 Yves Merck
- 👤 Daniel Maetens
- 👤 Jean-Marie Loutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:18
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/183; C08G63/20; C09; C09D; C09D163/00; C09D167/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
61 words
A process for the preparation of carboxyl group-terminated polyesters which comprises reacting in one step at elevated temperatures, terephthalic acid and at least one dihydric aliphatic compound, the proportions by weight of the respective reactants being such a to produce a polyester with an acid number of from 10 to 25 mg/KOH/g and a maximum hydroxyl number of 5 mg KOH/g.
Claim 2
Dependent Claim
61 words
A process for the preparation of carboxyl group-terminated polyesters which comprises reacting in one step at elevated temperatures, terephthalic acid and at least one dihydric aliphatic compound, the proportions by weight of the respective reactants being such a to produce a polyester with an acid number of from 10 to 25 mg/KOH/g and a maximum hydroxyl number of 5 mg KOH/g.
Claim 3
Dependent Claim
28 words
The process of claim 1, wherein said dihydric aliphatic compound is ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexanedimethanol or neopentylglycol hydroxypivalate.
Claim 4
Dependent Claim
19 words
The process of claim 1, wherein the dihydric aliphatic compound comprises at least 50 mole % of neopentyl glycol.
Claim 5
Dependent Claim
39 words
The process of claim 1, wherein said reactants also include an aromatic polycarboxylic acid having three or more carboxyl groups and/or a polyhydric organic compound having three or more hydroxyl groups and/or a linear aliphatic or cycloaliphatic dicarboxylic acid.
Claim 6
Dependent Claim
33 words
The process of claim 4, wherein said aromatic polycarboxylic acid having three or more carboxyl groups is trimellitic acid, trimesic acid, pyromellitic acid or an anhydride, acid chloride or lower alkyl ester thereof.
Claim 7
Dependent Claim
23 words
The process of claim 4, wherein said polyhydric organic compound having three or more hydroxyl groups, is glycerol, hexanetriol, trimethylolethane, trimethylolpropane or pentaerythritol.
Claim 8
Dependent Claim
28 words
The process of claim 4, wherein said linear aliphatic or cycloaliphatic dicarboxylic acid is present in an maximum of about 20 mol percent based on the terephthalic acid.
Claim 9
Dependent Claim
27 words
The process of claim 7, wherein said linear aliphatic or cycloaliphatic dicarboxylic acid is present in a maximum of 10 mol percent based on the terephthalic acid.
Claim 10
Dependent Claim
31 words
The process of claim 1, wherein the polyester produced has a theoretical number-average molecular weight of from 3,700 to 11,200 and a glass transition temperature of from 50° to 80° C.
Claim 11
Dependent Claim
56 words
A carboxyl group-terminated polyester prepared by reacting, in one step at an elevated temperature, terephthalic acid with at least one dihydric aliphatic compound, the proportions by weight of the respective reactants being such that the polyester has an acid number of from 10 to 25 mg KOH/g and a maximum hydroxyl number of 5 mg KOH/g.
Claim 12
Dependent Claim
56 words
A carboxyl group-terminated polyester prepared by reacting, in one step at an elevated temperature, terephthalic acid with at least one dihydric aliphatic compound, the proportions by weight of the respective reactants being such that the polyester has an acid number of from 10 to 25 mg KOH/g and a maximum hydroxyl number of 5 mg KOH/g.
Claim 13
Dependent Claim
141 words
A process for preparing a powdered thermosetting coating composition suitable for application as paint or varnish on electricity-conducting articles by electrostatic powder spray or fluidized bed coating processes which comprises reacting in one step at elevated temperatures, terephthalic acid and at least one dihydric aliphatic compound, the proportions by weight of the respective reactants being such as to produce a polyester with an acid number of from 10 to 25 mg KOH/g and a maximum hydroxyl number of 5 mg KOH/g; homogeneously mixing the resulting carboxyl group-terminated polyester with an epoxy compound containing at least two epoxy groups, the ratio of said epoxy compound to said carboxyl group-terminated polyester being such that there are from 0.7 to 1.3 equivalents of epoxy groups per equivalent of carboxyl groups in said carboxyl group-terminated polyester; and converting the resulting homogeneous mixture into a powder.
Claim 14
Dependent Claim
141 words
A process for preparing a powdered thermosetting coating composition suitable for application as paint or varnish on electricity-conducting articles by electrostatic powder spray or fluidized bed coating processes which comprises reacting in one step at elevated temperatures, terephthalic acid and at least one dihydric aliphatic compound, the proportions by weight of the respective reactants being such as to produce a polyester with an acid number of from 10 to 25 mg KOH/g and a maximum hydroxyl number of 5 mg KOH/g; homogeneously mixing the resulting carboxyl group-terminated polyester with an epoxy compound containing at least two epoxy groups, the ratio of said epoxy compound to said carboxyl group-terminated polyester being such that there are from 0.7 to 1.3 equivalents of epoxy groups per equivalent of carboxyl groups in said carboxyl group-terminated polyester; and converting the resulting homogeneous mixture into a powder.
Claim 15
Dependent Claim
19 words
The process of claim 11, wherein the dihydric aliphatic compound comprises at least 50 mole % of neopentyl glycol.
Claim 16
Dependent Claim
51 words
The process of claim 11, wherein said reactants also include an aromatic polycarboxylic acid having three or more carboxyl groups and/or a polyhydric organic compound having three or more hydroxyl groups and/or a maximum of about 20 mol percent based on terephthalic acid of a linear aliphatic or cycloaliphatic dicarboxylic acid.
Claim 17
Dependent Claim
30 words
The process of claim 11, wherein said polyester has a theoretical number-average molecular weight of from 3,700 to 11,200 and a glass transition temperature of from 50° to 80° C.
Claim 18
Dependent Claim
19 words
The process of claim 11, wherein said epoxy compound is triglycidyl isocyanurate or the diglycidyl ether of bisphenol A.
Claim 19
Dependent Claim
18 words
The process of claim 11, wherein the powder has a particle size of from 30 to 80 micrometers.
Claim 20
Dependent Claim
113 words
A powdered thermosetting coating composition which comprises a homogeneous mixture of (a) an epoxy compound containing at least two epoxy groups and (b) a carboxyl group-terminated polyester prepared by reacting, in one step at an elevated temperature, terephthalic acid and at least one dihydric aliphatic compound, the proportions by weight of the respective reactants being such that the polyester has an acid number of from 10 to 25 mg KOH/g and a maximum hydroxyl number of 5 mg KOH/g, the ratio of said epoxy compound to said carboxyl group-terminated polyester being such that there are from 0.7 to 1.3 equivalents of epoxy groups per equivalent of carboxyl groups in said carboxyl group-terminated polyester.
Claim 21
Dependent Claim
113 words
A powdered thermosetting coating composition which comprises a homogeneous mixture of (a) an epoxy compound containing at least two epoxy groups and (b) a carboxyl group-terminated polyester prepared by reacting, in one step at an elevated temperature, terephthalic acid and at least one dihydric aliphatic compound, the proportions by weight of the respective reactants being such that the polyester has an acid number of from 10 to 25 mg KOH/g and a maximum hydroxyl number of 5 mg KOH/g, the ratio of said epoxy compound to said carboxyl group-terminated polyester being such that there are from 0.7 to 1.3 equivalents of epoxy groups per equivalent of carboxyl groups in said carboxyl group-terminated polyester.
Claim 22
Dependent Claim
10 words
An electricity-conducting article coated with a composition of claim 17.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |