US3666723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimides from 2,6-diamino-s-triazines and dianhydrides
Assignee: Novartis Corp
•
Filing: 1969-08-01
•
Granted: 1972-05-30
•
Expires: 1989-08-01
Abstract
Abstract Triazine-based polyimides are prepared by first reacting dianhydrides with s-triazine compounds containing at least two primary aromatic, aliphatic or cycloaliphatic amino groups to give triazine-based polyamic acids which, on curing, yield the polyimides. The polyamic acids are soluble in organic solvents or ammonium hydroxide, the latter yielding the aqueous solutions. From said organic or aqueous solutions useful fibers, films, adhesives, coatings and composites can be prepared. The triazinebased polyimides possess high temperature oxidative stability, good mechanical properties and electrical properties and low void contents.
Inventors
- 👤 Raymond J Kray
- 👤 Roland A E Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:58
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1085; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2379/00; B32B2379/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
15 words
A polyimide according to claim 1 wherein said R group has the structure selected from
Claim 2
Dependent Claim
12 words
A polyimide according to claim 1 wherein said R'' is a phenylene.
Claim 3
Dependent Claim
12 words
A polyimide according to claim 1 wherein R2 is an amine radical.
Claim 4
Dependent Claim
12 words
A polyimide according to claim 1, said polyimide having the recurring unit
Claim 5
Dependent Claim
12 words
A polyimide according to claim 1, said polyimide having the recurring unit
Claim 6
Dependent Claim
14 words
A shapeable composition comprising a linear film-forming polyimide consisting essentially of recurring units of
Claim 7
Dependent Claim
14 words
A composition of claim 7 wherein said polyimide has the recurring unit selected from
Claim 8
Dependent Claim
9 words
A polyamic acid consisting essentially of the recurring unit
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |