US4533715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single package epoxy resin system
Assignee: Hexcel Corp
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Filing: 1983-09-07
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Granted: 1985-08-06
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Expires: 2003-09-07
Abstract
Abstract A curing agent for one package epoxy resin systems is disclosed as a imidazole blocked naphthyl diisocyanate which, when incorporated in epoxy resins, has an extended shelf life and can be cured by exposure to relatively low temperatures. The curing agent is insoluble in epoxy resins that are liquid at room temperature and is useful in connection therewith.
Inventors
- 👤 Frank W. C. Lee
- 👤 Kenneth S. Baron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:51
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/807; C08G18/808; C08G18/003; C08G18/28; C08G18/40; C08G18/58; C08G18/74; C08G18/76; C08G18/7657; C08G18/7678
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
38 words
A curing agent for epoxy resins having the formula ##STR2## wherein x, y, and z may be the same or different, and each may be hydrogen, a lower alkyl or aryl of C 1-12 , halo or nitro.
Claim 2
Dependent Claim
38 words
A curing agent for epoxy resins having the formula ##STR2## wherein x, y, and z may be the same or different, and each may be hydrogen, a lower alkyl or aryl of C 1-12 , halo or nitro.
Claim 3
Dependent Claim
14 words
The curing agent of claim 1, wherein x, y, and z are each hydrogen.
Claim 4
Dependent Claim
57 words
A one package epoxy resin system comprising: a curable epoxy resin, and a curing agent of the formula ##STR3## wherein x, y and z may be the same or different, and each may be hydrogen, a lower alkyl or aryl of C 1-12 , halo or nitro, said curing agent present in amounts of 0.1-10% by weight.
Claim 5
Dependent Claim
57 words
A one package epoxy resin system comprising: a curable epoxy resin, and a curing agent of the formula ##STR3## wherein x, y and z may be the same or different, and each may be hydrogen, a lower alkyl or aryl of C 1-12 , halo or nitro, said curing agent present in amounts of 0.1-10% by weight.
Claim 6
Dependent Claim
21 words
The one package epoxy resin system of claim 3, wherein x, y and z of said curing agent are each hydrogen.
Claim 7
Dependent Claim
21 words
The one package epoxy resin system of claim 3, wherein said curing agent is present in amounts of 3-4% by weight.
Claim 8
Dependent Claim
21 words
The one package epoxy resin system of claim 4, wherein said curing agent is present in amounts of 3-4% by weight.
Claim 9
Dependent Claim
21 words
The one package epoxy resin system of claim 3, wherein said epoxy resin system has a shelf life of 6-8 months.
Claim 10
Dependent Claim
23 words
The one package epoxy resin system of claim 3, wherein said system can be cured by exposure to a temperature of 160° F.
Claim 11
Dependent Claim
26 words
The one package epoxy resin system of claim 3, wherein said system can be cured by exposure to a temperature of 200° F. for 20-25 minutes.
Claim 12
Dependent Claim
30 words
The one package epoxy resin system of claim 3, wherein said system may be cured by exposure to a temperature of at least 250° F. for less than 15 minutes.
Claim 13
Dependent Claim
21 words
The one package epoxy resin system of claim 3, wherein said curable epoxy resin is a viscous liquid at room temperature.
Claim 14
Dependent Claim
21 words
The one package epoxy resin system of claim 4, wherein said curable epoxy resin is a viscous liquid at room temperature.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |