US4690997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant wire coating compositions
Assignee: General Electric Co
•
Filing: 1985-07-31
•
Granted: 1987-09-01
•
Expires: 2005-07-31
Abstract
Abstract Flame retardant silicon-polyimides are provided having improved elongation which are useful as wire coating compositions.
Inventors
- 👤 James A. Cella
- 👤 Marsha M. Grade
- 👤 Thomas L. Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:07
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/106; C08G77/00; C08G77/42; C08G77/452; C08G77/455; H01B3/46
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
132 words
Extrudable, flame retardant, polydiorganosiloxane polyimide comprising by weight, (A) from about 40 to 90% of chemically combined aryletherimide units having the formula, ##STR12## and (B) from about 10 to 60% of chemically combined polydiorganosiloxane consisting essentially of from about 11 to about 20 diorganosiloxy units, where the organo radicals attached to silicon are selected from monovalent C.sub.(1-14) hydrocarbon radicals and substituted monovalent C.sub.(1-14) hydrocarbon radicals, R 2 is selected from the class consisting of the same or different C.sub.(1-14) divalent hydrocarbon radicals, or substituted C.sub.(1-14) divalent hydrocarbon radicals, and R 4 is a divalent aryl radical selected from the class consisting of ##STR13## X 1 is a member selected from the class consisting of ##STR14## and p is 0 or 1, and y is an integer equal to 1 to 5 inclusive.
Claim 2
Dependent Claim
132 words
Extrudable, flame retardant, polydiorganosiloxane polyimide comprising by weight, (A) from about 40 to 90% of chemically combined aryletherimide units having the formula, ##STR12## and (B) from about 10 to 60% of chemically combined polydiorganosiloxane consisting essentially of from about 11 to about 20 diorganosiloxy units, where the organo radicals attached to silicon are selected from monovalent C.sub.(1-14) hydrocarbon radicals and substituted monovalent C.sub.(1-14) hydrocarbon radicals, R 2 is selected from the class consisting of the same or different C.sub.(1-14) divalent hydrocarbon radicals, or substituted C.sub.(1-14) divalent hydrocarbon radicals, and R 4 is a divalent aryl radical selected from the class consisting of ##STR13## X 1 is a member selected from the class consisting of ##STR14## and p is 0 or 1, and y is an integer equal to 1 to 5 inclusive.
Claim 3
Dependent Claim
13 words
A polydiorganosiloxane-polyimide composition in accordance with claim 1 where the polydiorganosiloxane is polydimethylsiloxane.
Claim 4
Dependent Claim
16 words
A polydiorganosiloxane-polyimide composition in accordance with claim 1 having an elongation percent of greater than 100.
Claim 5
Dependent Claim
16 words
A polydiorganosiloxane-polyimide in accordance with claim 1 having about 25% to 45% by weight of polydiorganosiloxane.
Claim 6
Dependent Claim
25 words
A polydiorganosiloxane-polyimide composition in accordance with claim 1 consisting essentially of bisphenol A etherimide units chemically combined with a mixture of dimethylsiloxane and metaphenylene units.
Claim 7
Dependent Claim
16 words
A polydiorganosiloxane-polyimide composition in accordance with claim 1 where the polydiorganosiloxane is an alkylene terminated polydiorganosiloxane.
Claim 8
Dependent Claim
21 words
Extrudable flame retardant silicone-polyetherimide wire coating compositions having an elongation of at least 100% which satisfies the UL 94 V-O test.
Claim 9
Dependent Claim
21 words
Extrudable flame retardant silicone-polyetherimide wire coating compositions having an elongation of at least 100% which satisfies the UL 94 V-O test.
Claim 10
Dependent Claim
26 words
Extrudable polydiorganosiloxane-polyimide in accordance with claim 1 wherein the polydiorganosiloxane block is a polydimethylsiloxane having an average of about 11 to 20 chemically combined dimethylsiloxy units.
Claim 11
Dependent Claim
34 words
Extrudable polydiorganosiloxane-polyimide in accordance with claim 1 where the aryletherimide units have the formula ##STR15## and the polydiorganosiloxane is a polydimethylsiloxane having an average of about 11 to about 20 chemically combined dimethylsiloxy units.
Claim 12
Dependent Claim
16 words
Extrudable polydiorganosiloxane-polyimide in accordance with claim 1 having about 25% to 45% by weight of polydiorganosiloxane.
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) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |