Patent US4500739A successfully refreshed from Google Patents.
US4500739A
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Process for the insertion of perfluoroolefines on perfluoropolyethers and corresponding products
Assignee: Montedison SpA
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Filing: 1983-03-18
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Granted: 1985-02-19
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Expires: 2003-03-18
Abstract
Abstract Perfluoropolyether comprising, besides --CF 2 -- and --CF 2 F 4 units, also a third fluoroalkylene unit containing three or more carbon atoms, said units being connected to each other through --O-ether bridges, and process for obtaining above said polyether, consisting in reacting a mixture of polyperoxidic perfluoropolyether and a fluorinated olefin, in the presence of U.V. radiations.
Inventors
- 👤 Gerardo Caporiccio
- 👤 Gian T. Viola
- 👤 Costante Corti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:37
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/002; C08G65/005; C08G65/007
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
Perfluoropolyether consisting of recurring --CF 2 --, --CF 2 CF 2 -- units and a third recurring at least partially fluorinated alkylenic unit containing at least three carbon atoms and comprising acid or neutral terminal groups selected from the group consisting of --CF 3 , C 2 F 5 , --CF 2 H, --COF and --CF 2 --COF, said recurring --CF 2 , --CF 2 CF 2 and alkylenic units being joined to each other through oxygen atoms with etheric bonds, and being arranged in a random distribution along the polymeric chain.
Claim 2
Dependent Claim
92 words
Perfluoropolyether consisting of recurring --CF 2 --, --CF 2 CF 2 -- units and a third recurring at least partially fluorinated alkylenic unit containing at least three carbon atoms and comprising acid or neutral terminal groups selected from the group consisting of --CF 3 , C 2 F 5 , --CF 2 H, --COF and --CF 2 --COF, said recurring --CF 2 , --CF 2 CF 2 and alkylenic units being joined to each other through oxygen atoms with etheric bonds, and being arranged in a random distribution along the polymeric chain.
Claim 3
Dependent Claim
28 words
Perfluoropolyether according to claim 1, characterized in that the sum of the --CF 2 -- and --CF 2 CF 2 -- units is comprised between 300 and 20,000.
Claim 4
Dependent Claim
41 words
Perfluoropolyether according to claim 1, characterized in that the numerical ratio between th fluoroalkylenic units with at least carbon atoms and the sum of the --CF 2 -- and --CF 2 CF 2 -- units is comprised between 0.05 and 0.25.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |