Patent US4130460A successfully refreshed from Google Patents.
Patent US4075184A successfully refreshed from Google Patents.
US4075184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sulfonating fluorocarbon polymers and fluorocarbon polymer produced thereby
Assignee: PPG Industries Inc
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Filing: 1976-03-11
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Granted: 1978-02-21
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Expires: 1996-03-11
Abstract
Abstract Disclosed is a method of sulfonating polymers having chlorotrifluoroethylene moieties. According to the disclosed method, a liquid composition containing the polymer, an excess of thiourea, and a solvent is maintained above about 100° C. at a pressure sufficient to maintain the composition liquid. A polymer product having trifluoroethylene sulfonic acid and chlorotrifluoroethylene moieties is recovered. Also disclosed is a polymer having (CX 1 X 2 -CX 3 X 4 ), (CF 2 -CFCl), and (CF 2 -CF(SO 3 )) moieties where X 1 , X 2 , X 3 , and X 4 may be hydrogen or fluorine.
Inventors
- 👤 Thomas A. Rechlicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:58
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A method of preparing a polymer having trifluoroethylene sulfonyl moieties comprising: providing a liquid composition comprising a polymer having chlorotrifluoroethylene moieties, a stoichiometric excess of a thiourea compound, and an organic solvent; maintaining the liquid composition above about 100° C. and at a pressure sufficient to maintain the composition liquid for a time sufficient to form a polymer having trifluoroethylene isothiouronium salt moieties; and thereafter converting the polymer having trifluoroethylene isothiouronium salt moieties to a polymer having trifluoroethylene sulfonyl moieties.
Claim 2
Independent Claim
80 words
A method of preparing a polymer having trifluoroethylene sulfonyl moieties comprising: providing a liquid composition comprising a polymer having chlorotrifluoroethylene moieties, a stoichiometric excess of a thiourea compound, and an organic solvent; maintaining the liquid composition above about 100° C. and at a pressure sufficient to maintain the composition liquid for a time sufficient to form a polymer having trifluoroethylene isothiouronium salt moieties; and thereafter converting the polymer having trifluoroethylene isothiouronium salt moieties to a polymer having trifluoroethylene sulfonyl moieties.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the thiourea compound is chosen from the group consisting of thiourea and substituted thioureas.
Claim 4
Dependent Claim
26 words
The method of claim 1 comprising contacting the polymer having trifluoroethylene isothiouronium salt moieties with chlorine whereby to form a polymer having trifluoroethylene sulfonyl chloride moieties.
Claim 5
Dependent Claim
41 words
The method of claim 1 comprising providing an aqueous composition containing the polymer having trifluoroethylene isothiouronium salt moieties and an alkali metal hydroxide, and heating the aqueous composition for a long enough period of time to form the alkali metal thiol.
Claim 6
Dependent Claim
18 words
A polymeric material consisting essentially of [CF 2 -CFCL] and [CF 2 -CF(SO 3 ) + ] moieties.
Claim 7
Dependent Claim
18 words
A polymeric material consisting essentially of [CF 2 -CFCL] and [CF 2 -CF(SO 3 ) + ] moieties.
Claim 8
Dependent Claim
50 words
A polymeric material consisting essentially of [CX 1 X 2 -CX 3 X 4 ], [CF 2 -CFCL], and [CF 2 -CF(SO 3 ) + ] moieties where X 1 , X 2 , X 3 , and X 4 are chosen from the group consisting of H and F.
Claim 9
Dependent Claim
50 words
A polymeric material consisting essentially of [CX 1 X 2 -CX 3 X 4 ], [CF 2 -CFCL], and [CF 2 -CF(SO 3 ) + ] moieties where X 1 , X 2 , X 3 , and X 4 are chosen from the group consisting of H and F.
Claim 10
Dependent Claim
17 words
The polymeric material of claim 6 having an equivalent weight of from about 700 to about 2,000.
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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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |