Patent US4523039A successfully refreshed from Google Patents.
US4523039A
Expired / Lapsed
US
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Method for forming perfluorocarbon ethers
Assignee: Exfluor Research Corp
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Filing: 1983-12-19
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Granted: 1985-06-11
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Expires: 2003-12-19
Abstract
Abstract A method is disclosed for producing fluorocarbon ethers wherein a high molecular weight polyether is reacted with elemental fluorine to produce a highly fluorinated polyether which is subjected to an elevated temperature sufficient to cause fragmentation of the polymer chain to produce fluorocarbon ethers.
Inventors
- 👤 Richard J. Lagow
- 👤 Glenn E. Gerhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:11
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/321; C08G65/323; C08G65/3233; C08G65/3236; C07; C07C; C07C41/00; C07C41/01
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A method for forming fluorocarbon ethers having perfluoralkyl groups, comprising: a. fluorinating a high molecular weight polyether under conditions which produce a fluorinated polyether; b. subjecting said fluorinated polyether to a temperature which is higher than the temperature used in the conditions in step a, and between approximately 55° C. and 210° C. to cause a controlled fragmentation of said polyether into lower molecular weight fluorocarbon ether compounds; and c. separating said fluorocarbon ether compounds from the reaction mixture.
Claim 2
Independent Claim
79 words
A method for forming fluorocarbon ethers having perfluoralkyl groups, comprising: a. fluorinating a high molecular weight polyether under conditions which produce a fluorinated polyether; b. subjecting said fluorinated polyether to a temperature which is higher than the temperature used in the conditions in step a, and between approximately 55° C. and 210° C. to cause a controlled fragmentation of said polyether into lower molecular weight fluorocarbon ether compounds; and c. separating said fluorocarbon ether compounds from the reaction mixture.
Claim 3
Dependent Claim
15 words
A method of claim 1, where said fluorination is carried out with elemental fluorine gas.
Claim 4
Dependent Claim
16 words
A method of claim 1, where said high molecular weight polyether is perfluorinated to a perfluoropolyether.
Claim 5
Dependent Claim
27 words
A method of claim 1, where said high molecular weight polyether compound comprises a polyalkylene oxide ether wherein said alkylene group contains at least two carbon atoms.
Claim 6
Dependent Claim
12 words
A method of claim 4 wherein said poly(alkylene oxide)ether comprises polypropylene oxide.
Claim 7
Dependent Claim
52 words
A method of claim 1, where the high molecular weight polyether is polyethylene oxide and the lower molecular weight fluorocarbon ether compounds have the formula R f --O--(CF 2 --CF 2 --O) n --R f , where n is 1-6 and R f is CF 3 or C 2 F 5 .
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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |