Patent US4471025A successfully refreshed from Google Patents.
US4471025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy resin and noval cross-linking agent therefor
Assignee: Chloe Chimie SA
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Filing: 1983-12-06
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Granted: 1984-09-11
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Expires: 2003-12-06
Abstract
Abstract A composition of matter including (i) an epoxy resin and (ii) a cross-linking agent therefor, said cross-linking agent being the reaction product of trimellitic anhydride with a diol, and wherein such reaction the molar ratio anhydride/diol is not in excess of 2, is a useful binder for coating compositions, notably the powder paints.
Inventors
- 👤 Daniel Bernelin
- 👤 Jacques Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:35
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
162 words
A composition of matter comprising (i) an epoxy resin having more than one 1,2-epoxy group per molecule and (ii) a cross-linking agent therefore comprising a dianhydride bearing ester functions, the amounts of (i) and (ii) in said composition being sufficient to achieve an essentially stoichiometric equilibrium between the reactive functional groups characterizing said two components, said cross-linking agent having a softening point between about 70° and about 120° C. and being prepared by a direct esterification reaction between trimellitic anhydride and ethylene glycol thereby liberating water, said esterification reaction being conducted at temperatures between about 180° and about 250° C. until no further water is liberated with said cross-linking agent being essentially free of hydroxy groups and having an acid number in aqueous medium between about 390 and 540 and an acid number in alcoholic medium between about 250 and 320, and wherein such reaction the molar ratio of the trimellitic anhydride to the ethylene glycol is from 2/1 to about 2/1.5.
Claim 2
Dependent Claim
162 words
A composition of matter comprising (i) an epoxy resin having more than one 1,2-epoxy group per molecule and (ii) a cross-linking agent therefore comprising a dianhydride bearing ester functions, the amounts of (i) and (ii) in said composition being sufficient to achieve an essentially stoichiometric equilibrium between the reactive functional groups characterizing said two components, said cross-linking agent having a softening point between about 70° and about 120° C. and being prepared by a direct esterification reaction between trimellitic anhydride and ethylene glycol thereby liberating water, said esterification reaction being conducted at temperatures between about 180° and about 250° C. until no further water is liberated with said cross-linking agent being essentially free of hydroxy groups and having an acid number in aqueous medium between about 390 and 540 and an acid number in alcoholic medium between about 250 and 320, and wherein such reaction the molar ratio of the trimellitic anhydride to the ethylene glycol is from 2/1 to about 2/1.5.
Claim 3
Dependent Claim
36 words
The composition of matter as defined by claim 1, said epoxy resin (i) being a saturated epoxy resin having an epoxy number between 400 and 1500 and a melting point between 50° C. and 120° C.
Claim 4
Dependent Claim
30 words
The composition of matter as defined by claim 2, said epoxy resin having an epoxy number between 500 and 1000 and a melting point between 70° C. and 100° C.
Claim 5
Dependent Claim
23 words
The composition of matter as defined by claims 1, said epoxy resin (i) being the condensation product of a diphenol with an epihalohydrin.
Claim 6
Dependent Claim
21 words
The composition of matter as defined by claim 1, said epoxy resin (i) being the condensation product of 2,2-(4-hydroxyphenyl)-propane with epichlorohydrin.
Claim 7
Dependent Claim
31 words
The composition of matter as defined by claim 1, further comprising a member selected from the group consisting of a spreading agent, a pigment, a colorant, a filler, and admixtures thereof.
Claim 8
Dependent Claim
13 words
A coating composition comprising that composition of matter as defined by claim 1.
Claim 9
Dependent Claim
13 words
The coating composition as defined by claim 7, which comprises a powder paint.
Claim 10
Dependent Claim
17 words
A cross-linked polymer comprising the reaction product of that composition of matter as defined by claim 1.
Claim 11
Dependent Claim
25 words
The cross-linked polymer as defined by claim 9, said reaction having been conducted at 150° C. to 220° C., for from 5 to 40 minutes.
Claim 12
Dependent Claim
14 words
A coated substrate, the coating comprising the cross-linked polymer as defined by claim 9.
Claim 13
Dependent Claim
31 words
The coated substrate as defined by claim 11, the coating comprising a powder paint and the substrate being a member selected from the group consisting of a metal and a ceramic.
Claim 14
Dependent Claim
15 words
A coated substrate, the coating comprising the composition of matter as defined by claim 1.
Claim 15
Dependent Claim
31 words
The coated substrate as defined by claim 13, the coating comprising a powder paint and the substrate being a member selected from the group consisting of a metal and a ceramic.
Claim 16
Dependent Claim
36 words
The composition of matter as defined by claim 1, said epoxy resin (i) having an epoxy number between 850 and 950, and said cross-linking agent (ii) having a melting point between 80° C. and 100° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |