US4173658A
Expired / Lapsed
US
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Powder coating compositions
Assignee: Huels AG
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Filing: 1978-06-28
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Granted: 1979-11-06
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Expires: 1998-06-28
Abstract
Abstract Powder coating compositions, for coating metallic surfaces at high temperatures, comprising saturated, high-molecular thermoplastic copolyesters obtained by the condensation of terephthalic acid and other dicarboxylic acids with 1,4-butanediol and, optionally, other diols, and conventional auxiliary agents and additives.
Inventors
- 👤 Hanns-Jorg Bax
- 👤 Jorn Ruter
- 👤 Roland Feinauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:30
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/199; C09; C09D; C09D167/00; C09D167/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31786
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
In a powder polyester coating composition for coating of metallic surfaces at high temperatures whose polyester is a saturated, high-molecular thermoplastic co-polyester obtained by condensation of a functional derivative of a mixture of dicarboxylic acids with one or more diols at least 60 molar percent of which is 1,4-butanediol, the improvement wherein the acid portion of the polyester polymer units consists essentially of a mixture of three acids which are (a) terephthalic acid, (b) 10-60 molar percent of one or more cycloaliphatic dicarboxylic acids of up to 12 carbon atoms and (c) up to 20 molar percent of one or more aliphatic dicarboxylic acids of 2-12 carbon atoms, whereby high values of both Erichsen depression and impact depression are achieved in the finally applied coating.
Claim 2
Dependent Claim
125 words
In a powder polyester coating composition for coating of metallic surfaces at high temperatures whose polyester is a saturated, high-molecular thermoplastic co-polyester obtained by condensation of a functional derivative of a mixture of dicarboxylic acids with one or more diols at least 60 molar percent of which is 1,4-butanediol, the improvement wherein the acid portion of the polyester polymer units consists essentially of a mixture of three acids which are (a) terephthalic acid, (b) 10-60 molar percent of one or more cycloaliphatic dicarboxylic acids of up to 12 carbon atoms and (c) up to 20 molar percent of one or more aliphatic dicarboxylic acids of 2-12 carbon atoms, whereby high values of both Erichsen depression and impact depression are achieved in the finally applied coating.
Claim 3
Dependent Claim
23 words
The powder coating composition of claim 1, wherein the acid portion of the polyester contains 20-50 molar percent of a cycloaliphatic dicarboxylic acid.
Claim 4
Dependent Claim
14 words
The powder coating composition of claim 1, wherein the cycloaliphatic acid is hexahydroterephthalic acid.
Claim 5
Dependent Claim
15 words
The powder coating composition of claim 3, wherein the aliphatic dicarboxylic acid is dodecanedioic acid.
Claim 6
Dependent Claim
38 words
The powder coating composition of claim 1, wherein the diol portion contains up to 40 molar percent of a cycloaliphatic diol of up to 12 carbon atoms or an aliphatic diol of 2-12 carbon atoms other than 1,4-butanediol.
Claim 7
Dependent Claim
13 words
The powder coating composition of claim 5, wherein the cycloaliphatic diol is 1,4-dihydroxymethylcyclohexane.
Claim 8
Dependent Claim
28 words
The powder coating composition of claim 1, wherein the diacid portion contains 30 molar percent of hexahydroterephthalic acid and the diol portion contains 10 molar percent of 1,4-dihydroxymethylcyclohexane.
Claim 9
Dependent Claim
33 words
The powder coating composition of claim 1, wherein the polyester has a reduced specific viscosity (η red as a 0.23% solution in a 60/40 mixture of phenol/1,1,2,2-tetrachloroethylene at 25° C.) of 0.7-1.0 dl./g.
Claim 10
Dependent Claim
45 words
In a process for applying an impact resistant, highly adherent coating to a metal substrate by a fluidized bed, flame spraying or electrostatic coating method at a temperature of 200°-400° C., the improvement comprising using as a coating composition the polyester composition of claim 1.
Claim 11
Dependent Claim
37 words
A process according to claim 9 wherein the coating is applied to the metal substrate by dipping the coated substrate, heated above the melting point of the coating composition, into a fluidized bed of the coating composition.
References Cited (Backward Citations)
US2961365A
Cited
US2901466A
Cited
US3013914A
Cited
US3090772A
Cited
US3232813A
Cited
US3505293A
Cited
US3678128A
Cited
US3763109A
Cited
US4012363A
Cited
US4011188A
Cited
US4072662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |