US4530991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latent curing agents for epoxy resins
Assignee: Ajinomoto Co Inc
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Filing: 1983-10-12
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Granted: 1985-07-23
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Expires: 2003-10-12
Abstract
Abstract Hydrazides of the formula (I) or (II) N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.3 (I) (NH.sub.2 NHCOCH.sub.2 CH.sub.2).sub.2 N--R--N--CH.sub.2 CH.sub.2 CONHNH 2 ) 2 (II) are good latent curing agents for epoxy resin, in the formula (II) R is divalent hydrocarbon residue having 2-24 carbon atoms. The curing agents are useful in formulating novel storable one-package, heat-curable epoxy resin-based compositions.
Inventors
- 👤 Kiyomiki Hirai
- 👤 Koji Takeuchi
- 👤 Nobuo Ito
- 👤 Masahiro Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:07
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4035; C07; C07C; C07C243/00; C07C243/24; C07C243/26; C07C243/34
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
31 words
A compound having the formula (I) or (II): N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.3 (I) (NH.sub.2 NHCOCH.sub.2 CH.sub.2 --.sub.2 N--R--N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.2 (II) wherein R is a divalent hydrocarbon residue having 2-24 carbon atoms.
Claim 2
Dependent Claim
31 words
A compound having the formula (I) or (II): N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.3 (I) (NH.sub.2 NHCOCH.sub.2 CH.sub.2 --.sub.2 N--R--N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.2 (II) wherein R is a divalent hydrocarbon residue having 2-24 carbon atoms.
Claim 3
Dependent Claim
14 words
A compound claimed in claim 1, wherein R is --(CH 2 ) 12 --.
Claim 4
Dependent Claim
57 words
A curable epoxy resin composition comprising (a) an epoxy resin having an average of more than one epoxy group per molecule and (b), as curing agent, a compound having the formula (I) or (II): N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.3 (I) (NH.sub.2 NHCOCH.sub.2 CH.sub.2 --.sub.9 N--R--N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.2 (II) wherein R is a divalent hydrocarbon residue having 2-24 carbon atoms.
Claim 5
Dependent Claim
57 words
A curable epoxy resin composition comprising (a) an epoxy resin having an average of more than one epoxy group per molecule and (b), as curing agent, a compound having the formula (I) or (II): N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.3 (I) (NH.sub.2 NHCOCH.sub.2 CH.sub.2 --.sub.9 N--R--N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.2 (II) wherein R is a divalent hydrocarbon residue having 2-24 carbon atoms.
Claim 6
Dependent Claim
30 words
The curable epoxy resin composition claimed in claim 3, wherein the amount of said compound is enough to provide 0.5-1.5 times active hydrogen equivalent weight based on epoxy equivalent weight.
Claim 7
Dependent Claim
17 words
The curable epoxy resin composition claimed in claim 3, wherein R is --(CH 2 ) 12 --.
Claim 8
Dependent Claim
19 words
The curable epoxy resin composition claimed in claim 3, wherein said epoxy resin is polyglycidyl ether of polyhydric phenol.
Claim 9
Dependent Claim
75 words
A cured resin obtained by contacting an epoxy resin having an average of more than 1 epoxy group per molecule with as curing agent a compound having the formula (I) or (II): N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.3 (I) (NH.sub.2 NHCOCH.sub.2 CH.sub.2 --.sub.2 N--R--N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.2 (II) wherein R is a divalent hydrocarbon residue having 2-24 carbon atoms, the amount of said compound being enough to provide 0.5-1.5 times active hydrogen equivalent weight based on epoxy equivalent weight.
Claim 10
Dependent Claim
75 words
A cured resin obtained by contacting an epoxy resin having an average of more than 1 epoxy group per molecule with as curing agent a compound having the formula (I) or (II): N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.3 (I) (NH.sub.2 NHCOCH.sub.2 CH.sub.2 --.sub.2 N--R--N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.2 (II) wherein R is a divalent hydrocarbon residue having 2-24 carbon atoms, the amount of said compound being enough to provide 0.5-1.5 times active hydrogen equivalent weight based on epoxy equivalent weight.
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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |