US4935490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly soluble aromatic polyimides
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1988-04-13
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Granted: 1990-06-19
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Expires: 2008-04-13
Abstract
Abstract Aromatic polyimides of the formula: ##STR1## where --Ar-- is ##STR2## --Ar'-- is ##STR3## --Ar"-- is ##STR4## where --Z, and --Z 1 , independently are --Cl, --Br or --I; where --X, --X 1 , --X 2 and --X 3 independently are --CH 3 or --C 2 H 5 ; and --Y,--Y 1 ,--Y 2 and --Y 3 are primary or secondary alkyl groups having 3 to 12 carbon atoms, provided that when m is greater than 0, r is 0 and that when L is greater than 0, r and s are 0, are disclosed. These polyimides are very soluble, even in weak solvents such as toluene.
Inventors
- 👤 Richard A. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:51
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1042
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A film forming highly soluble aromatic polyimide consisting essentially of repeating units of the formula ##STR9## where --Ar-- is ##STR10## --Ar'-- is ##STR11## --Ar"-- is ##STR12## where --Z, and --Z 1 , independently are --Cl, --Br or --I; where --X, --X 1 , --X 2 and --X 3 independently are --CH 3 or --C 2 H 5 ; and --Y, --Y 1 , --Y 2 , and --Y 3 are primary or secondary alkyl groups having 3 to 12 carbon atoms, when m is greater than 0, r is 0 and when L is greater than 0, r is 0.
Claim 2
Dependent Claim
100 words
A film forming highly soluble aromatic polyimide consisting essentially of repeating units of the formula ##STR9## where --Ar-- is ##STR10## --Ar'-- is ##STR11## --Ar"-- is ##STR12## where --Z, and --Z 1 , independently are --Cl, --Br or --I; where --X, --X 1 , --X 2 and --X 3 independently are --CH 3 or --C 2 H 5 ; and --Y, --Y 1 , --Y 2 , and --Y 3 are primary or secondary alkyl groups having 3 to 12 carbon atoms, when m is greater than 0, r is 0 and when L is greater than 0, r is 0.
Claim 3
Dependent Claim
11 words
The polyimide of claim 1 wherein m and L are 0.
Claim 4
Dependent Claim
12 words
The polyimide of claim 2 wherein --Z and --Z 1 are --Cl.
Claim 5
Dependent Claim
9 words
The polyimide of claim 3 wherein t is 0.
Claim 6
Dependent Claim
9 words
The polyimide of claim 3 wherein r is 0.
Claim 7
Dependent Claim
13 words
The polyimide of claim 1 wherein 100% of n and L are 0.
Claim 8
Dependent Claim
15 words
The polyimide of claim 1 wherein r is 0 and n and m are 0.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |