US4808686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone-polyimides, and method for making
Assignee: General Electric Co
•
Filing: 1987-06-18
•
Granted: 1989-02-28
•
Expires: 2007-06-18
Abstract
Abstract Silicone-polyimides having improved flexibility can be obtained, by sequentially intercondensing organic diamine, aminoorgano terminated polydiorganosiloxane and aromatic bisanhydride. A decrease in flexural modulus and an increase in elongation percent is effected while flame retardance remains substantially unchanged.
Inventors
- 👤 James A. Cella
- 👤 Patrick E. Gallagher
- 👤 Gary K. Shank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:34
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/46; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/106; C08G77/00; C08G77/42; C08G77/452; C08G77/455; H01B3/303; H01B3/306
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
53 words
Flame retardant extrudable silicone polyimide having improved flexibility and useful as a wire-coating insulator comprising by weight from about 40 to 90% of arylimide units chemically combined with from 10 to about 60% of polydiorganosiloxane having an elongation of at least 100% and a flexural modulus (psi) of from about 28,500 to 150,000.
Claim 2
Dependent Claim
53 words
Flame retardant extrudable silicone polyimide having improved flexibility and useful as a wire-coating insulator comprising by weight from about 40 to 90% of arylimide units chemically combined with from 10 to about 60% of polydiorganosiloxane having an elongation of at least 100% and a flexural modulus (psi) of from about 28,500 to 150,000.
Claim 3
Dependent Claim
48 words
A flame retardant extrudable silicone polyimide in accordance with claim 1, which is the condensation product of reaction of a mixture comprising aryl diamine, aromatic bisanhydride and a silicone polyimide oligomer having terminal anhydride groups and a degree of polymerization of from about 1.5 to 50 repeat units.
Claim 4
Dependent Claim
47 words
A flame retardant extrudable silicone polyimide in accordance with claim 1, which is the condensation product of reaction of a mixture comprising silicone diamine, aromatic bisanhydride and aryl polyimide oligomer having terminal anhydride groups and a degree of polymerization of from about 1.5 to 50 repeat units.
Claim 5
Dependent Claim
20 words
A silicone-polyimide in accordance with claim 1, which is the condensation production of reaction of at least two oligomeric imides.
Claim 6
Dependent Claim
17 words
A flame retardant extrudable silicone polyimide in accordance with claim 2, where the aryl diamine is metaphenylenediamine.
Claim 7
Dependent Claim
18 words
A flame retardant extrudable silicone polyimide in accordance with claim 3, where the silicone diamine is an aminopropylpolydimethylsiloxane.
Claim 8
Dependent Claim
21 words
A flame retardant extrudable silicone polyimide in accordance with claim 2, where the aromatic bisanhydride is a mixture of aromatic bisanhydrides.
Claim 9
Dependent Claim
20 words
A flame retardant extrudable silicone polyimide in accordance with claim 2, where the aromatic bisanhydride is an aromatic bis(ether anhydride).
Claim 10
Dependent Claim
18 words
A flame retardant extrudable silicone polyimide in accordance with claim 2, where the aromatic bisanhydride is 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride.
Claim 11
Dependent Claim
21 words
A flame retardant extrudable silicone polyimide in accordance with claim 3, where the aromatic bisanhydride is a mixture of aromatic bisanhydrides.
Claim 12
Dependent Claim
20 words
A flame retardant extrudable silicone polyimide in accordance with claim 3, where the aromatic bisanhydride is an aromatic bis(ether anhydride).
Claim 13
Dependent Claim
18 words
A flame retardant extrudable silicone polyimide in accordance with claim 3, where the aromatic bisanhydride is 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride.
Claim 14
Dependent Claim
8 words
A silicone-polyimide foam in accordance with claim 1.
Claim 15
Dependent Claim
8 words
A silicone-polyimide film in accordance with claim 1.
Claim 16
Dependent Claim
8 words
A silicone-polyimide fiber in accordance with claim 1.
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) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |