Patent US4522952A successfully refreshed from Google Patents.
US4522952A
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Process for the fluorination of polymers, and perfluorinated ion exchangers
Assignee: Hoechst AG
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Filing: 1983-11-08
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Granted: 1985-06-11
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Expires: 2003-11-08
Abstract
Abstract The present invention relates to a process for preparation of a highly fluorinated polymer by converting a polymer containing the recurring unit R--S'--X m , in which R denotes a base unit forming the matrix, X denotes identical or different functional groups, with the exception of halogen, and S' is an aromatic or araliphatic radical with m+1 free valencies, m being at least 1, into a highly fluorinated polymer by fluorination with elementary fluorine. The process is particularly useful for the preparation of cation exchangers, such as those which contain the unit ##STR1## in which C 6 F 10 represents a perfluorinated cyclohexyl ring.
Inventors
- 👤 Joachim Klein
- 👤 Hartmut Widdecke
- 👤 Frank Doscher
- 👤 Fritz Pohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:59
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A process for preparing a perfluorinated cation exchanger consisting essentially of contacting a polymer with elemental fluorine in the absence of liquid solvent said polymer containing a repeating unit R--S'--Xm wherein R is a base unit forming a polymer matrix, X represents the radical SO 2 F, S' is an aromatic or araliphatic radical with m+1 free valences and m is at least 1 to form a perfluorinated acid derivative and converting it into its corresponding free acid or an alkali metal salt thereof by treatment with water or an alkali metal salt thereof.
Claim 2
Dependent Claim
94 words
A process for preparing a perfluorinated cation exchanger consisting essentially of contacting a polymer with elemental fluorine in the absence of liquid solvent said polymer containing a repeating unit R--S'--Xm wherein R is a base unit forming a polymer matrix, X represents the radical SO 2 F, S' is an aromatic or araliphatic radical with m+1 free valences and m is at least 1 to form a perfluorinated acid derivative and converting it into its corresponding free acid or an alkali metal salt thereof by treatment with water or an alkali metal salt thereof.
References Cited (Backward Citations)
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Cited
US3884885A
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JPS524489A
Cited
US4076916A
Cited
GB2031906A
Cited
US4296151A
Cited
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 |