US5281680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of fluorinated copolymers
Assignee: EIDP Inc
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Filing: 1993-01-14
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Granted: 1994-01-25
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Expires: 2013-01-14
Abstract
Abstract The invention is a process for the nonaqueous polymerization of tetrafluoroethylene with functional fluorinated comonomers. The process uses low TFE to comonomer ratios to form copolymers with high molecular weight and low melt flow. The copolymers are useful as membranes in electrolytic cells or fuel cells.
Inventors
- 👤 Walther G. Grot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:41
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A process for the production of fluorinated copolymers comprising the nonaqueous copolymerization of tetrafluoroethylene ("TFE") and a comonomer having the formula CF 2 =CFO(CF 2 CF{CF 3 }O) n CF 2 CF 2 SO 2 F, where n=0 or 1, in a solvent which does not substantially influence or limit the equivalent weight of the copolymer in the presence of 0-70 weight percent solvent and a soluble initiator, at a temperature suitable for the decomposition of said initiator, and agitating the TFE and the comonomer at a TFE pressure in the range of about 280-1100 kPa, having a TFE to comonomer ratio of between 2.1:1 and 5.6:1.
Claim 2
Dependent Claim
107 words
A process for the production of fluorinated copolymers comprising the nonaqueous copolymerization of tetrafluoroethylene ("TFE") and a comonomer having the formula CF 2 =CFO(CF 2 CF{CF 3 }O) n CF 2 CF 2 SO 2 F, where n=0 or 1, in a solvent which does not substantially influence or limit the equivalent weight of the copolymer in the presence of 0-70 weight percent solvent and a soluble initiator, at a temperature suitable for the decomposition of said initiator, and agitating the TFE and the comonomer at a TFE pressure in the range of about 280-1100 kPa, having a TFE to comonomer ratio of between 2.1:1 and 5.6:1.
Claim 3
Dependent Claim
11 words
The process of claim 1 in which the comonomer has n=1.
Claim 4
Dependent Claim
15 words
The process of claim 1 in which the weight percent of the solvent is 0.
Claim 5
Dependent Claim
22 words
The process of claim 1 in which the copolymer has a melt flow of less than 30 g/10 minutes at 270° C.
Claim 6
Dependent Claim
22 words
The process of claim 4 in which the copolymer has a melt flow of less than 20 g/10 minutes at 270° C.
Claim 7
Dependent Claim
13 words
The process of claim 1 in which the TFE pressure is 400-800 kPa.
Claim 8
Dependent Claim
13 words
The process of claim 1 in which the initiator is a peroxy compound.
Claim 9
Dependent Claim
14 words
The process of claim 1 in which the solvent is 1,1,2 trifluorotrichloroethane or perfluorodimethylcyclobutane.
Claim 10
Dependent Claim
16 words
The process of claim 1 in which the solvent is a perfluoroalkane, perfluorocycloalkane or mixtures thereof.
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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) | 1997-01-24 | 1997-07-26 | 1998-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-24 | 2001-07-26 | 2002-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-24 | 2005-07-26 | 2006-01-25 | $7700.00 | Window Closed / Lapsed |