US3622540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of curing epoxy resins using n-(aminoalkyl)-lactams or diaza-bicyclo-alkenes
Assignee: San-Abbott Ltd
•
Filing: 1969-06-12
•
Granted: 1971-11-23
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Expires: 1989-06-12
Abstract
Abstract This invention relates to the method of hardening an epoxy resin containing 1,2-epoxy group in the presence of an N-(aminoalkyl)lactam.
Inventors
- 👤 Sei Hashimoto
- 👤 Keizo Nakatani
- 👤 Shoji Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:14
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/54; C08G59/44; C08G59/448; C08G59/5046; C08G59/5053
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
The process of claim 1 wherein said N-(aminoalkyl)-lactam is prepared in situ from the corresponding diaza-bicyclo-alkene of the formula:
Claim 2
Dependent Claim
10 words
The process of claim 2 wherein said diaza-bicyclo-alkene is 1,8-diaza-bicyclo(5,4,0)undecene-7.
Claim 3
Dependent Claim
10 words
The process of claim 2 wherein said diaza-bicyclo-alkene is 1,5-diaza-bicyclo(4,3,0)nonene-5.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein n is an integer from 3 to 5 and m is 2 or 3.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein said N-(aminoalkyl)-lactam is N-(3-aminopropyl)- epsilon -caprolactam.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said N-(aminoalkyl)-lactam is N-(3-aminopropyl)- gamma -butyrolactam.
Claim 7
Dependent Claim
31 words
The process of claim 2 wherein water is present in an amount of from 1 to 30 percent by weight based on the amount of said diaza-bicyclo-alkene to effect said hydrolysis.
References Cited (Backward Citations)
US3396145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |