Patent US3755253A successfully refreshed from Google Patents.
US3755253A
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Catalization of diaminodiphenylsulfone cure of polyepoxides with an imidazole compound or a salt thereof
Assignee: Shell USA Inc
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Filing: 1971-09-24
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Granted: 1973-08-28
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Expires: 1991-09-24
Abstract
Abstract New adhesive compositions having substantially shortened cure cycles comprise the reaction product of (1) a polyepoxide (2) an aromatic amine such as diaminodiphenylsulfone, and (3) a catalytic amount of an imidazole compound or a salt thereof.
Inventors
- 👤 K Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:56
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/686; C08G59/40; C08G59/50; C08G59/5033; C09; C09J; C09J163/00; C08L; C08L2666/00; C08L2666/28; Y; Y10; Y10S; Y10S525/00; Y10S525/93
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
29 words
A composition as in claim 1 wherein the imidazole salt is selected from the group consisting of acetate and lactate salts of 2-ethyl-4-methylimidazole, 2-methylimidazole, imidazole, benzimidazole, and mixtures thereof.
Claim 2
Dependent Claim
34 words
from about 10 to 40 parts per 100 parts by weight of said polyepoxide of diaminodiphenylsulfone, and 3. a catalytic amount of an imidazole compound or an acid salt thereof having the general formula:
Claim 3
Dependent Claim
11 words
A composition as in claim 1 wherein the catalyst is imidazole.
Claim 4
Dependent Claim
11 words
A composition as in claim 1 wherein tHe catalyst is 2-ethyl-4-methylimidazole.
Claim 5
Dependent Claim
17 words
A composition as in claim 1 wherein the polyepoxide is a glycidyl polyether of a polyhydric phenol.
Claim 6
Dependent Claim
12 words
A composition as in claim 5 wherein the polyhydric phenol is 2,2-bis(4-hydroxyphenyl)propane.
Claim 7
Dependent Claim
20 words
A cured composition prepared by curing the composition of claim 1 at 90 to 160*C for 1 to 3 hours.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |