US3975362A
Expired / Lapsed
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Low temperature reversion resistant organosilicon polymers
Assignee: Dow Silicones Corp
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Filing: 1975-04-28
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Granted: 1976-08-17
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Expires: 1995-04-28
Abstract
Abstract Polymers which are flexible down to -40°F. and which do not depolymerize appreciably when heated in a closed space at 500° F. or above have the structure ##EQU1## These polymers can be cured to rubbers which are solvent resistant and are flexible over a wide temperature range. Such rubbers are useful for sealing aircraft fuel tanks.
Inventors
- 👤 Yung K. Kim
- 👤 Michael O. Riley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:36
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/50; C08G77/04; C08G77/20; C08G77/485
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
46 words
A siloxane copolymer of the average formula in which R and R' are independently methyl or CF 3 CH 2 CH 2 --, R f is a perfluoroalkylene radical of 2 to 10 carbon atoms, n has an average value of from 1 to 2, and
Claim 2
Dependent Claim
46 words
A siloxane copolymer of the average formula in which R and R' are independently methyl or CF 3 CH 2 CH 2 --, R f is a perfluoroalkylene radical of 2 to 10 carbon atoms, n has an average value of from 1 to 2, and
Claim 3
Dependent Claim
31 words
A copolymer of claim 1 in which R groups are methyl, one R' is methyl and the other CF 3 CH 2 CH 2 -- and R f is --CF 2
Claim 4
Dependent Claim
13 words
A composition of matter comprising a cured polymer of claim 1 and a
Claim 5
Dependent Claim
31 words
The cured composition of claim 3 in which both R groups are methyl, one R' is methyl and the other CF 3 CH 2 CH 2 -- and R f is
Claim 6
Dependent Claim
40 words
A curable composition consisting essentially of a copolymer of claim 2, a crosslinker of the formula CF 3 CH 2 CH 2 `H(CH 3 ) 2 SiO` 2 SiOSi`OSi(CH 3 ) 2 H` 2 CH 2 CH 2 CF 3
Claim 7
Dependent Claim
6 words
The cured composition of claim 5.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |