Patent US4360601A successfully refreshed from Google Patents.
US4360601A
Expired / Lapsed
US
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Process for extraction of fluorinated copolymers with fluorocarbons
Assignee: EIDP Inc
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Filing: 1980-12-10
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Granted: 1982-11-23
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Expires: 2000-12-10
Abstract
Abstract A process for extracting a fluorinated polymer which contains carboxylic ester functional groups with a liquid compound which is preferably a perchlorofluorocarbon having a boiling point in the range of 30° to 125° C. is described. Polymer so extracted can be fabricated into a membrane and hydrolyzed to ion exchange form to provide a membrane for electrolytic cells. When used as the membrane for a chloralkali cell, such membrane provides improved performance, e.g., a high level of current efficiency and low power consumption are maintained for an extended period of time when compared against a membrane of like construction fabricated from polymer which has not been so extracted.
Inventors
- 👤 Terry M. Copeland
- 👤 Paul R. Resnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:33
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/26; C08F6/28
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
123 words
A process comprising extracting a fluorinated polymer having --COOR functional groups, where R is lower alkyl, with a liquid compound having the formula: C.sub.j Cl.sub.g F.sub.f H.sub.h, where: j is an integer of at least 1, each of g, f and h is zero or an integer of at least 1, provided that g+f+h is 2j+2 in the case of alkanes, and is 2j in the case of cycloalkanes, and further provided that the normal boiling point is in the range of 30° to 125° C., said extraction being carried out for a total period of time of from 15 minutes to 72 hours at a pressure in the range of 10 4 to 10 6 pascals, and drying the resulting extracted polymer.
Claim 2
Dependent Claim
123 words
A process comprising extracting a fluorinated polymer having --COOR functional groups, where R is lower alkyl, with a liquid compound having the formula: C.sub.j Cl.sub.g F.sub.f H.sub.h, where: j is an integer of at least 1, each of g, f and h is zero or an integer of at least 1, provided that g+f+h is 2j+2 in the case of alkanes, and is 2j in the case of cycloalkanes, and further provided that the normal boiling point is in the range of 30° to 125° C., said extraction being carried out for a total period of time of from 15 minutes to 72 hours at a pressure in the range of 10 4 to 10 6 pascals, and drying the resulting extracted polymer.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein said liquid compound is continuously passed through said polymer for said period of time, whereby a resulting liquid extract is collected separate from a resulting solid polymer phase.
Claim 4
Dependent Claim
80 words
The process of claim 1 wherein said extracting comprises the steps of: (a) contacting said fluorinated polymer with said liquid compound, said contacting being carried out for a period of from 1 minute to 12 hours, and separating a resulting liquid extract from a resulting solid polymer phase; (b) repeating step (a) a plurality of times, employing said resulting solid polymer phase as said fluorinated polymer, the time for all repetitions of step (a) being said total period of time.
Claim 5
Dependent Claim
33 words
The process of claim 2 or 3 wherein said pressure is about 10 5 pascals, and said extracting is at a temperature near the boiling point of said liquid compound at said pressure.
Claim 6
Dependent Claim
33 words
The process of claim 4 wherein said fluorinated polymer is a perfluorinated polymer, h is zero, and the boiling point of said liquid compound is in the range of 40° to 110° C.
Claim 7
Dependent Claim
28 words
The process of claim 5 wherein distillate is recovered from said resulting liquid extract by vaporization and condensation and is returned to said process as said liquid compound.
Claim 8
Dependent Claim
58 words
The process of claim 4 wherein said fluorinated polymer is a copolymer of tetrafluoroethylene and a compound having the formula ##STR10## where: n is 0, 1 or 2, m is 1, 2, 3 or 4, Y is F or CF 3 , and R is CH 3 , C 2 H 5 or C 3 H 7 .
Claim 9
Dependent Claim
23 words
The process of claim 7 wherein n is 1, m is 2, Y is CF 3 , and R is CH 3 .
Claim 10
Dependent Claim
11 words
The process of claim 7 wherein said liquid compound is 1,1,2-trichloro-1,2,2-trifluoroethane.
Claim 11
Dependent Claim
11 words
The resulting solid polymer formed in the process of claim 7.
Claim 12
Dependent Claim
29 words
An ion exchange polymer having --COOM functional groups, where M is H, Na, K or NH 4 , formed by hydrolysis of said resulting solid polymer of claim 10.
Claim 13
Dependent Claim
19 words
An ion exchange membrane in which there is a layer which comprises said ion exchange polymer of claim 11.
Claim 14
Dependent Claim
34 words
An electrolytic cell which comprises an anode compartment, an anode situated within said anode compartment, a cathode compartment, a cathode situated within said cathode compartment, and, between said compartments, said membrane of claim 12.
Claim 15
Dependent Claim
51 words
In a process for electrolysis of brine in a chloralkali cell which comprises an anode, a cathode, an anode compartment, a cathode compartment, and a fluorine-containing cation exchange membrane which separates said compartments, to form caustic and chlorine, the improvement which comprises employing as said membrane the membrane of claim 12.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |