Patent US5149744A successfully refreshed from Google Patents.
US5149744A
Expired / Lapsed
US
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Process for the direct fluorination of polymeric resins
Assignee: FLUORODYNAMICS Inc A CORP OF CANADA
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Filing: 1990-06-28
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Granted: 1992-09-22
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Expires: 2010-06-28
Abstract
Abstract A process for the direct fluorination of polymeric resins in which polymeric material capable of being fluorinated is contacted with elemental fluorine and a dense carrier fluid having a critical temperature higher than ambient temperature, a boiling point lower than ambient temperature minus 60 celcius degrees, and a molecular weight greater than the molecular weight of elemental fluorine. The dense carrier fluid preferably has a molecular weight in the range of about 40 to about 200.
Inventors
- 👤 Gregorio Tarancon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:31
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22; B; B01; B01J; B01J19/00; B01J19/18; B01J19/20; B01J8/00; B01J8/0015; B01J8/08; B01J8/10; B01J8/18; B01J8/1881; B01J8/24; B01J8/26; B01J2219/00; B01J2219/18; B01J2219/185; B01J2219/187
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
A process for fluorinating polymeric material capable of being fluorinated comprising the steps of contacting said polymeric material with elemental fluorine and a dense carrier fluid having a critical temperature higher than ambient temperature, a boiling point lower than ambient temperature minus 60 celsius degrees, and a molecular weight in the range of about 40 to about 200, said elemental fluorine being present in the dense carrier fluid in a concentration in the range of about 2 to about 15% by volume.
Claim 2
Dependent Claim
82 words
A process for fluorinating polymeric material capable of being fluorinated comprising the steps of contacting said polymeric material with elemental fluorine and a dense carrier fluid having a critical temperature higher than ambient temperature, a boiling point lower than ambient temperature minus 60 celsius degrees, and a molecular weight in the range of about 40 to about 200, said elemental fluorine being present in the dense carrier fluid in a concentration in the range of about 2 to about 15% by volume.
Claim 3
Dependent Claim
33 words
A process as claimed in claim 1 in which the dense carrier fluid is selected from the group consisting of perfluoropropane, chloropentafluoroethane, sulphurtetrafluoride, sulphur hexafluoride, tetrafluoroethylene, hexafluoroethane, carbon dioxide, chlorotrifluoromethane, bromotrifluoromethane, and trifluoromethane.
Claim 4
Dependent Claim
28 words
A process as claimed in claim 2 in which said polymeric material is in the form of solid particles in the range of 10 mm to 100 microns.
Claim 5
Dependent Claim
26 words
A process as claimed in claim 1 in which the dense carrier fluid has a molecular weight in the range of about 44 to about 188.
Claim 6
Dependent Claim
33 words
A process as claimed in claim 2 in which the elemental fluorine is present in the dense carrier fluid in a concentration in the range of about 2 to about 12% by volume.
Claim 7
Dependent Claim
41 words
A process as claimed in claim 1 in which the dense carrier fluid has a vaporous condition outside the dew point in the temperature range of about 60 celcius degrees above ambient temperature and about 60 celcius degrees below ambient temperature.
Claim 8
Dependent Claim
33 words
A process as claimed in claim 6 in which the dense carrier fluid has a vaporous condition outside the dew point in the temperature range of about -36° C. to about 84° C.
References Cited (Backward Citations)
US4593050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-22 | 1996-03-23 | 1996-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-22 | 2000-03-23 | 2000-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-22 | 2004-03-23 | 2004-09-22 | $7700.00 | Window Closed / Lapsed |