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US5254773A
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Process for preparing telomers from ethylene and alpha, omega-dibromoperfluoroalkylalkanes in the presence of organic free-radical generators
Assignee: Dow Silicones Corp
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Filing: 1993-02-26
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Granted: 1993-10-19
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Expires: 2013-02-26
Abstract
Abstract A process is disclosed wherein a telomer having the formula BrCH 2 CH 2 (CF 2 CFX) n CH 2 CH 2 Br is prepared by reacting a telogen of the formula Br(CF 2 CFX) n CH 2 CH 2 Br with ethylene in the presence of an organic free-radical generator, wherein X is fluorine or a trifluoromethyl radical and n is an integer having a value of 1-5. It has been found that, when at least 0.05 mole of said free-radical generator is used for each mole of said telogen, the conversion of the telogen to the telomer is surprisingly increased.
Inventors
- 👤 Antony P. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:36
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/272; C07C17/275
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
97 words
In a process for the preparation of a telomer having the formula BrCH 2 CH 2 (CF 2 CFX) n CH 2 CH 2 Br comprising reacting a telogen of the formula Br(CF 2 CFX) n CH 2 CH 2 Br with ethylene in the presence of an organic free-radical generator, wherein X is independently selected from the group consisting of a fluorine radical and a trifluoromethyl radical and n is an integer having a value of 1-5, inclusive, the improvement comprising using at least 0.05 mole of said free-radical generator for each mole of said telogen.
Claim 2
Dependent Claim
97 words
In a process for the preparation of a telomer having the formula BrCH 2 CH 2 (CF 2 CFX) n CH 2 CH 2 Br comprising reacting a telogen of the formula Br(CF 2 CFX) n CH 2 CH 2 Br with ethylene in the presence of an organic free-radical generator, wherein X is independently selected from the group consisting of a fluorine radical and a trifluoromethyl radical and n is an integer having a value of 1-5, inclusive, the improvement comprising using at least 0.05 mole of said free-radical generator for each mole of said telogen.
Claim 3
Dependent Claim
14 words
The process according to claim 1, wherein said free-radical generator is an organic peroxide.
Claim 4
Dependent Claim
16 words
The process according to claim 2, wherein the value of n is 1 to 3, inclusive.
Claim 5
Dependent Claim
10 words
The process according to claim 3, wherein X is fluorine.
Claim 6
Dependent Claim
10 words
The process according to claim 4, wherein n is 1.
Claim 7
Dependent Claim
23 words
The process according to claim 5, wherein 0.06 to 1.8 moles of said organic peroxide is used for each mole of said telogen.
Claim 8
Dependent Claim
23 words
The process according to claim 6, wherein 0.1 to 0.2 mole of said organic peroxide is used for each mole of said telogen.
Claim 9
Dependent Claim
13 words
The process according to claim 7, wherein said organic peroxide is t-butyl peroxide.
Claim 10
Dependent Claim
16 words
The process according to claim 1, wherein the value of n is 1 to 3, inclusive.
Claim 11
Dependent Claim
10 words
The process according to claim 9, wherein X is fluorine.
Claim 12
Dependent Claim
10 words
The process according to claim 10, wherein n is 1.
Claim 13
Dependent Claim
23 words
The process according to claim 11, wherein 0.1 to 0.2 mole of said free-radical generator is used for each mole of said telogen.
Claim 14
Dependent Claim
23 words
The process according to claim 1, wherein said process is a flow-through process carried out at a pressure of 1 to 2 atmospheres.
Claim 15
Dependent Claim
23 words
The process according to claim 2, wherein said process is a flow-through process carried out at a pressure of 1 to 2 atmospheres.
Claim 16
Dependent Claim
23 words
The process according to claim 5, wherein said process is a flow-through process carried out at a pressure of 1 to 2 atmospheres.
Claim 17
Dependent Claim
23 words
The process according to claim 6, wherein said process is a flow-through process carried out at a pressure of 1 to 2 atmospheres.
Claim 18
Dependent Claim
23 words
The process according to claim 7, wherein said process is a flow-through process carried out at a pressure of 1 to 2 atmospheres.
Claim 19
Dependent Claim
23 words
The process according to claim 8, wherein said process is a flow-through process carried out at a pressure of 1 to 2 atmospheres.
References Cited (Backward Citations)
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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) | 1996-10-18 | 1997-04-19 | 1997-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-18 | 2001-04-19 | 2001-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-18 | 2005-04-19 | 2005-10-19 | $7700.00 | Window Closed / Lapsed |