US4861845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of fluoroolefins
Assignee: EIDP Inc
•
Filing: 1988-03-10
•
Granted: 1989-08-29
•
Expires: 2008-03-10
Abstract
Abstract The polymerization of fluoromonomers can be accomplished without fouling by using gaseous monomers in the presence of at least one nonvolatile initiator and by recycling the initiator-free polymerizer gases through an external cooler.
Inventors
- 👤 Edgar W. Slocum
- 👤 Aquiles C. Sobrero
- 👤 Robert C. Wheland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:12
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; Y; Y10; Y10S; Y10S526/00; Y10S526/913
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
In a continuous, free-radical initiated process for preparing fluorinated polymers comprising polymerizing at least one gaseous fluoroolefin in a stirred polymerizer, the improvement consisting essentially of removing polymerization heat by recycling polymerizer gases through an external heat exchanger and the initiator used for polymerization is not capable of entering the recycle gas stream.
Claim 2
Dependent Claim
53 words
In a continuous, free-radical initiated process for preparing fluorinated polymers comprising polymerizing at least one gaseous fluoroolefin in a stirred polymerizer, the improvement consisting essentially of removing polymerization heat by recycling polymerizer gases through an external heat exchanger and the initiator used for polymerization is not capable of entering the recycle gas stream.
Claim 3
Dependent Claim
11 words
A process as in claim 1 wherein said initiator is perhalogenated.
Claim 4
Dependent Claim
37 words
A process as in claim 2 wherein said initiator is perfluoroether peroxide having the formula {CF 3 CF 2 CF 2 O[CF(CF 3 )CF 2 O] n CF(CF 3 )COO] 2 wherein n is greater than 2.
Claim 5
Dependent Claim
8 words
A process as in claim 3 wherein n=5.9.
Claim 6
Dependent Claim
11 words
A process as in claim 1 wherein the fluoroolefin includes TFE.
Claim 7
Dependent Claim
13 words
A process as in claim 1 where TFE is the sole gaseous fluoroolefin.
Claim 8
Dependent Claim
17 words
A process as in claim 5 wherein said at least one gaseous fluoroolefin comprises TFE and PPVE.
Claim 9
Dependent Claim
20 words
A process as in claim 7 wherein the weight ratio of TFE to PPVE is at least 9 to 1.
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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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |