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US3979393A
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Imidyl- and isoimidyl-phthalic anhydrides, process for their manufacture and their use for curing epoxide resins
Assignee: Novartis Corp
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Filing: 1974-12-09
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Granted: 1976-09-07
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Expires: 1994-12-09
Abstract
Abstract The invention relates to new imidyl compounds of the formula Ia and isoimidyl compounds of the formula Ib IN WHICH A denotes a divalent organic radical, especially an ethenylene, ethylene or propylene group. These compounds serve as curing agents for epoxide resins and give cured products with good mechanical and electrical properties.
Inventors
- 👤 Vratislav Kvita
- 👤 Roland Darms
- 👤 Gerd Greber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:15
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4042; B32B5/02; C08G59/42; C08G59/4223; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/10; B32B2262/101; B32B2305/00; B32B2305/07; B32B2305/076
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
Imidyl-phthalic anhydrides of the formula ##EQU1## wherein Y represents the divalent radical ##SPC22## and A represents a divalent radical selected from the group consisting of ##EQU2## ##SPC23## ##EQU3## ##SPC24## R 1 and R 2 independently of one another denote hydrogen, chlorine, bromine or methyl.
Claim 2
Dependent Claim
44 words
Imidyl-phthalic anhydrides of the formula ##EQU1## wherein Y represents the divalent radical ##SPC22## and A represents a divalent radical selected from the group consisting of ##EQU2## ##SPC23## ##EQU3## ##SPC24## R 1 and R 2 independently of one another denote hydrogen, chlorine, bromine or methyl.
References Cited (Backward Citations)
GB1192001A
Cited
US3829444A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |