Patent US3989673A successfully refreshed from Google Patents.
US3989673A
Expired / Lapsed
US
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Low temperature curing resin system
Assignee: Raytheon Co
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Filing: 1974-12-30
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Granted: 1976-11-02
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Expires: 1994-12-30
Abstract
Abstract A new system of epoxy resins and curing agents is disclosed which may be cured at low temperatures to yield polymeric materials capable of providing excellent binders for filled systems. The new combination exhibits a useful pot life, and cures at low temperatures to form a tough, dimensionally stable polymer.
Inventors
- 👤 Robert K. Jenkins
- 👤 Boyce G. Kimmel
- 👤 Gary Luster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:17
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5046; C08G59/5053; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
A low temperature curing epoxy resin system comprised of a polymerizable glycidyl ether epoxy resin and a curing agent consisting of an eutectic mixture of piperidine and an alkyl substituted imidazole.
Claim 2
Dependent Claim
31 words
A low temperature curing epoxy resin system comprised of a polymerizable glycidyl ether epoxy resin and a curing agent consisting of an eutectic mixture of piperidine and an alkyl substituted imidazole.
Claim 3
Dependent Claim
31 words
The resin system of claim 1 wherein said curing agent is of from 9 to 5 parts by weight of 2-ethyl, 4-methyl imidazole and from 1-5 parts by weight of piperidine.
Claim 4
Dependent Claim
24 words
The resin system of claim 2 wherein said epoxy resin is a diglycidyl ether of bis-phenol A having an epoxide equivalent weight of 180-190.
Claim 5
Dependent Claim
29 words
The resin system of claim 2 wherein 10 parts by weight of said curing agent is added to 100 parts by weight of a diglycidyl ether of bis-phenol A.
Claim 6
Dependent Claim
27 words
The resin system of claim 4 wherein said curing agent consists of 4 parts by weight of piperidine and 6 parts by weight of 2-ethyl, 4-methyl imidazole.
References Cited (Backward Citations)
US3438937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |