Patent US4525542A successfully refreshed from Google Patents.
US4525542A
Expired / Lapsed
US
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Novolac based epoxy resin curing agents for use in solvent
Assignee: Resolution Performance Products LLC
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Filing: 1984-09-20
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Granted: 1985-06-25
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Expires: 2004-09-20
Abstract
Abstract The instant invention is an epoxy resin curing agent based upon an epoxy novolac containing, on the average, between about 3 and about 7.5 epoxy groups per molecule, in which substantially all of the epoxide groups are reacted with a polyamine wherein each primary amine hydrogen in the resulting reaction product is further reacted with a monoepoxide. The resulting epoxy resin curing agent may be used in a solvent based system to cure epoxy resins under low temperature curing conditions.
Inventors
- 👤 William J. DeGooyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:19
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/182; C08G59/184; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
60 words
A novolac based epoxy resin curing agent comprising the reaction product of an epoxy novolac compound, a primary amine containing polyamine and a monoepoxide, wherein substantially all of the epoxy groups are reacted with the polyamines and wherein at least substantially all of the unreacted primary amine groups in the polyamine/epoxide reaction product groups are further reacted with the monoepoxide.
Claim 2
Dependent Claim
60 words
A novolac based epoxy resin curing agent comprising the reaction product of an epoxy novolac compound, a primary amine containing polyamine and a monoepoxide, wherein substantially all of the epoxy groups are reacted with the polyamines and wherein at least substantially all of the unreacted primary amine groups in the polyamine/epoxide reaction product groups are further reacted with the monoepoxide.
Claim 3
Dependent Claim
41 words
The curing agent of claim 1 wherein, the epoxy novolac is prepared by epoxidizing the reaction product of a phenol and an aldehyde to produce an epoxy containing product having, on the average, about 3 to 7.5 epoxide groups per molecule.
Claim 4
Dependent Claim
14 words
The curing agent of claim 2 wherein the novolac is a phenol/formaldehyde based novolac.
Claim 5
Dependent Claim
16 words
The curing agent of this claim 2 wherein the phenol is at least in part bisphenol-A.
Claim 6
Dependent Claim
17 words
This curing agent of claim 1 wherein the novolac is based at least in part on glyoxal.
Claim 7
Dependent Claim
12 words
The curing agent of claim 1 wherein the polyamine is a polyalkylenepolyamine.
Claim 8
Dependent Claim
31 words
The curing agent of claim 1 wherein the polyamine has the formula: ##STR2## wherein n is 0 to 4 and R is an alkylene group containing 2 to 8 carbon atoms.
Claim 9
Dependent Claim
20 words
The curing agent of claims 6 or 7 wherein the amine is selected from diethylenetriamine, triethylenetetramine, tetraethylenepentamine and meta-xylyene diamine.
Claim 10
Dependent Claim
17 words
The curing agent of claim 1 wherein the monoepoxide is an aromatic monoepoxide or an epoxidized oil.
Claim 11
Dependent Claim
18 words
The curing agent of claim 1 wherein the monoepoxide is cresyl monoglycidyl ether or epoxidized cashew nut oil.
Claim 12
Dependent Claim
21 words
A low temperature curable coating composition comprising the curing agent of claims 1-7, 9 or 10 in admixture with a polyepoxide.
Claim 13
Dependent Claim
16 words
The composition of claim 11 wherein the polyepoxide is a polyglycidyl ether of a dihydric phenol.
Claim 14
Dependent Claim
11 words
The composition of claim 12 wherein the dihydric phenol is bisphenol-A.
Claim 15
Dependent Claim
19 words
The composition of claim 11 wherein the polyepoxide has a weight per epoxide of no greater than about 600.
Claim 16
Dependent Claim
18 words
The composition of claim 14 wherein the polyepoxide has a weight per epoxide of about 180 to 200.
Claim 17
Dependent Claim
39 words
The composition of claim 11 wherein the ratio of the epoxy groups on the polyepoxide to the reactive amine hydrogen groups in the curing agent is in the range of about 0.5 to 1.0 to about 1.5 to 1.0.
References Cited (Backward Citations)
DE1071331B
Cited
US3686101A
Cited
US3474073A
Cited
US4021410A
Cited
US4093594A
Cited
US4116900A
Cited
US4189539A
Cited
US4246148A
Cited
US4348505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |