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US4876329A
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Polyimide polymers and copolymers using 3,5-diaminobenzotrifluoride
Assignee: Texas A&M University System
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Filing: 1988-06-28
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Granted: 1989-10-24
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Expires: 2008-06-28
Abstract
Abstract Partially soluble, film-forming polyimides and their copolymers made using 3,5-diaminobenzotrifluoride are described. Thin films and coatings of these materials are relatively colorless and the polymers have a high Tg, excellent thermal stability, lower moisture uptake, and lower dielectric constant. They are useful as films, fibers, molded articles and as protective coatings, interlevel dielectrics, electric circuit substrates and the like for the electronics industry.
Inventors
- 👤 Weilong L. Chiang
- 👤 Douglas E. Fjare
- 👤 Neal R. Nowicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:53
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1039; C08G73/1042; C08G73/1067; C08G73/1071
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
10 words
A partially soluble, film-forming polyimide or copolyimide made from 3,5-diaminobenzotrifluoride.
Claim 2
Dependent Claim
10 words
A partially soluble, film-forming polyimide or copolyimide made from 3,5-diaminobenzotrifluoride.
Claim 3
Dependent Claim
33 words
A partially soluble, film-forming polyimide or copolyimide made from 3,5-diaminobenzotrifluoride and a compound selected from the group consisting of the symmetrical dianhydrides of benzene, biphenyl, diphenylether, benzophenone, and 2,2-bis(3,4-dicarboxyphenyl)propane dianhydride and 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride.
Claim 4
Dependent Claim
33 words
A partially soluble, film-forming polyimide or copolyimide made from 3,5-diaminobenzotrifluoride and a compound selected from the group consisting of the symmetrical dianhydrides of benzene, biphenyl, diphenylether, benzophenone, and 2,2-bis(3,4-dicarboxyphenyl)propane dianhydride and 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride.
Claim 5
Dependent Claim
20 words
The polyimide or copolymide of claim 2 wherein said compound is a symmetrical dianhydride of benzene, biphenyl, diphenylether, and benzophenone.
Claim 6
Dependent Claim
13 words
The polyimide or copolyimide of claim 2 wherein said compound is pyromellitic dianhydride.
Claim 7
Dependent Claim
12 words
The polyimide of claim 2 wherein said compound is 3,3',4,4'-biphenyltetracarboxylic acid dianhydride.
Claim 8
Dependent Claim
12 words
The polyimide of claim 2 wherein said compound is 3,3',4,4'-oxydiphthalic acid anhydride.
Claim 9
Dependent Claim
13 words
The polyimide or copolyimide of claim 2 wherein said compound is 2,2-bis(3,4-dicarboxyphenyl)propane dianhydride.
Claim 10
Dependent Claim
13 words
The polyimide or copolyimide of claim 2 wherein said compound is 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride.
References Cited (Backward Citations)
US4690999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |