Patent US776724A successfully refreshed from Google Patents.
Patent US4551676A successfully refreshed from Google Patents.
Patent US2709574A successfully refreshed from Google Patents.
Patent US3574441A successfully refreshed from Google Patents.
Patent US1887207A successfully refreshed from Google Patents.
Patent US3665041A successfully refreshed from Google Patents.
US3665041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluorinated polyethers and process for their preparation
Assignee: Montedison SpA
•
Filing: 1968-04-02
•
Granted: 1972-05-23
•
Expires: 1988-04-02
Abstract
Abstract New polyether oligomers, homopolymers and copolymers consisting only of carbon, fluorine and oxygen atoms, having only perfluoralkyl terminal groups, and containing no peroxidic oxygen. Prepared by reacting polyether which contains reactive terminal groups and, optionally, peroxidic oxygen with fluorine gas under pressures between about 0.2 and 10 atmospheres and at temperatures between about 100* and 350* C.
Inventors
- 👤 Dario Sianesi
- 👤 Renzo Fontanelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:20
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01B3/24; C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/12; C07C43/126; C08; C08G; C08G65/00; C08G65/002; C08G65/005; C08G65/007; C08G65/02; C08G65/32; C08G65/321; C08G65/323; C08G65/3233; C08G65/3236
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
The product of claim 9 wherein there are no -C3F6-O-repeating units and the ratio of the total of -CF2-CF2-O- units to the total of -CF2-O- units is between 0.001 and 10.
Claim 2
Dependent Claim
26 words
The product of claim 2 wherein said ratio of the total of -CF2-CF2-O- units to the total of -CF2- O- units is between 0.2 and 5.
Claim 3
Dependent Claim
31 words
The product of claim 9 wherein there are no -CF2-CF2-O-repeating units and the ratio of the total of -CF2-O- units to the total of -C3F6-O- units is between 0.02 and 1.
Claim 4
Dependent Claim
252 words
A process for the preparaTion of the perfluorinated polyether of claim 9 which comprises reacting fluorine, either pure or diluted with an inert gas up to a fluorine content of 10 percent by volume, under pressures between about 0.2 and 10 atmospheres and at a temperature between about 100* and 350* C with a liquid polyether having the average formula: W-O-(-C3F6-O-)S-(-CF2-O-)T-(-C2F4-O-)U-(-O-)V-Z in which W and Z are terminal groups, one of said terminal groups being selected from the group consisting of when S is different from zero, while when S is equal to zero it is selected only from the group consisting of -CF3, -COF, -CF2-COF and -CF2H, and the other said terminal group being selected from the group consisting of when the index S is different from zero, while when S is zero such other terminal group is selected only from the group consisting of -COF, -CF2-COF and -CF2H; (-O-) is an oxygen atom distributed randomly along the chain and bound in the peroxidic form to the perfluorooxyalkylene units; S, T, U and V are average composition indices, of which S, U and V can be equal to zero, with the proviso that when one of said indices S and U is zero the other of said indices is not zero, the sum of S+T+U has a value between about 2 and 200, the ratio S/T+U is between about zero and 50, the ratio U/T is between about zero and 10, and the ratio V/S+T+U+l is between about zero and 0.1.
Claim 5
Dependent Claim
24 words
The process of claim 5 wherein the reaction is carried out at a temperature between about 120* and 320* C under about atmospheric pressure.
Claim 6
Dependent Claim
20 words
The process of claim 5 wherein said inert gas is selected from the group consisting of nitrogen, helium and argon.
Claim 7
Dependent Claim
20 words
The process of claim 6 wherein said inert gas is selected from the group consisting of nitrogen, helium and argon.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |