US4011255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluoroalkyleneether difunctional compounds
Assignee: United States Department of the Air Force
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Filing: 1975-09-04
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Granted: 1977-03-08
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Expires: 1995-09-04
Abstract
Abstract Omega-carbomethoxyperfluoroalkylene ether iodides are reacted with metallic zinc to yield alpha-omega perfluoroalkyleneether diesters. The diesters are reacted with ammonia to form diamides, the diamides are reacted with phosphorus pentoxide to form dinitriles, and the dinitriles are esterified with methanol to form diimidate esters. The diimidate esters are particularly useful as monomers in synthesizing perfluoroalkylene ether bibenzoxazole polymers possessing thermooxidative stability and outstanding low temperature viscoelastic properties.
Inventors
- 👤 Christ Tamborski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:17
CPC Classifications
C; C07; C07C; C07C43/00; C07C257/00; C07C257/04; C07C257/06; C08; C08G; C08G65/00; C08G65/002; C08G65/005; C08G65/007; C10; C10M; C10M2213/00; C10M2213/06; C10M2213/0606
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A fluoroalkyleneether difunctional compound having the following formula: NC--R.sub.f --CN, wherein R f is Y[CF(CF 3 )CF 2 O] n (CF 2 ) 4 [OCF 2 CF(CF 3 )] n Y, wherein each Y is (CF 2 ) 4 O or CF(CF 3 )OCF 2 CF 2 O and the carbon atom of each CN radical is bonded to a carbon atom, and wherein n is an integer from 1 to 5, inclusive.
Claim 2
Dependent Claim
73 words
A fluoroalkyleneether difunctional compound having the following formula: NC--R.sub.f --CN, wherein R f is Y[CF(CF 3 )CF 2 O] n (CF 2 ) 4 [OCF 2 CF(CF 3 )] n Y, wherein each Y is (CF 2 ) 4 O or CF(CF 3 )OCF 2 CF 2 O and the carbon atom of each CN radical is bonded to a carbon atom, and wherein n is an integer from 1 to 5, inclusive.
Claim 3
Dependent Claim
15 words
The compound according to claim 1 in which Y is (CF 2 ) 4 O.
Claim 4
Dependent Claim
17 words
The compound according to claim 1 in which Y is CF(CF 3 )OCF 2 CF 2 O.
References Cited (Backward Citations)
US3347901A
Cited
US3505411A
Cited
US3715378A
Cited
US3847978A
Cited
US3652464A
Cited
US3660315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |