US5494984A
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Method for producing a fluorinated polymer
Assignee: AGC Inc
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Filing: 1994-03-16
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Granted: 1996-02-27
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Expires: 2014-03-16
Abstract
Abstract A method for producing a fluorinated polymer containing fluoroolefin units as the main constituting units, wherein CF 3 (CF 2 ) n CH 2 CH 3 or CF 3 (CF 2 ) n H, wherein n is an integer of from 1 to 8), the is used as the polymerization medium, and CF 2 ClCF 2 CHClF and/or CF 3 CF 2 CHCl 2 as a chain transfer agent. Using the polymerization medium which is less likely to bring about an environmental destruction, it is possible to obtain a fluorinated polymer excellent in the heat resistance, solvent resistance, chemical resistance, etc. Further, the above chain transfer agent has good compatibility with the polymerization medium which scarcely brings about the environmental destruction, whereby it is possible to efficiently produce a fluorinated polymer excellent in the heat resistance and solvent resistance. This chain transfer agent has affinity to the resulting polymer and to the polymerization medium and has excellent handling efficiency for post treatment such as granulation or drying.
Inventors
- 👤 Atsushi Funaki
- 👤 Teruo Takakura
- 👤 Kazuo Kato
- 👤 Kazuo Hamazaki
- 👤 Haruhisa Miyake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:52
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
A method for producing a fluorinated polymer containing fluoroolefin units as the main constituting units by polymerization in a polymerization medium, wherein CF 3 (CF 2 ) n CH 2 CH 3 or CF 3 (CF 2 ) n H, wherein n is an integer of from 1 to 8, is used as the polymerization medium, and wherein CF 2 ClCF 2 CHClF and/or CF 3 CF 2 CHCl 2 is used as a chain transfer agent for polymerization.
Claim 2
Independent Claim
79 words
A method for producing a fluorinated polymer containing fluoroolefin units as the main constituting units by polymerization in a polymerization medium, wherein CF 3 (CF 2 ) n CH 2 CH 3 or CF 3 (CF 2 ) n H, wherein n is an integer of from 1 to 8, is used as the polymerization medium, and wherein CF 2 ClCF 2 CHClF and/or CF 3 CF 2 CHCl 2 is used as a chain transfer agent for polymerization.
Claim 3
Dependent Claim
29 words
The method according to claim 1, wherein CF 3 (CF 2 ) n CH 2 CH 3 is CF 3 (CF 2 ) 3 CH 2 CH 3 .
Claim 4
Dependent Claim
22 words
The method according to claim 1, wherein CF 3 (CF 2 ) n H is CF 3 (CF 2 ) 5 H.
Claim 5
Independent Claim
86 words
A method for producing a fluorinated polymer containing fluoroolefin units as the main constituting units selected from the group consisting of a tetrafluoroethylene/ethylene copolymer, a tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, a tetrafluoroethylene/hexafluoropropylene copolymer, a tetrafluoroethylene/ethylene/(perfluoroalkyl)ethylene copolymer, and a tetrafluoroethylene/perfluorovinyl ether having a FSO 2 -group copolymer by polymerization in a polymerization medium, wherein CF 3 (CF 2 ) n CH 2 CH 3 or CF 3 (CF 2 ) n H, wherein n is an integer of from 1 to 8, is used as the polymerization medium.
Claim 6
Independent Claim
86 words
A method for producing a fluorinated polymer containing fluoroolefin units as the main constituting units selected from the group consisting of a tetrafluoroethylene/ethylene copolymer, a tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, a tetrafluoroethylene/hexafluoropropylene copolymer, a tetrafluoroethylene/ethylene/(perfluoroalkyl)ethylene copolymer, and a tetrafluoroethylene/perfluorovinyl ether having a FSO 2 -group copolymer by polymerization in a polymerization medium, wherein CF 3 (CF 2 ) n CH 2 CH 3 or CF 3 (CF 2 ) n H, wherein n is an integer of from 1 to 8, is used as the polymerization medium.
Claim 7
Dependent Claim
32 words
The method according to claim 4, wherein CF 3 (CF 2 ) n CH 2 CH 3 is CF 3 (CF 2 ) 3 or CF 3 (CF 2 ) 5 H.
Claim 8
Dependent Claim
24 words
The method according to claim 1, wherein the amount of the polymerization medium is from 3 to 100 times the total weight of monomers.
Claim 9
Dependent Claim
28 words
The method according to claim 1, wherein CF 2 ClCF 2 CHClF and/or CF 3 CF 2 CHCl 2 is used as a chain transfer agent for polymerization.
Claim 10
Dependent Claim
18 words
The method according to claim 1, wherein an alcohol is used as a chain transfer agent for polymerization.
Claim 11
Dependent Claim
11 words
The method according to claim 8, wherein the alcohol is methanol.
Claim 12
Dependent Claim
31 words
The method according to claim 8, wherein the amount of a chain transfer agent used, is from 0.01 to 200 wt % based on the total weight of the polymerization medium.
References Cited (Backward Citations)
GB805115A
Cited
GB1027411A
Cited
GB1057088A
Cited
EP0211251B1
Cited
US5037914A
Cited
US5182342A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-02-26 | 1999-08-28 | 2000-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-26 | 2003-08-28 | 2004-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-26 | 2007-08-28 | 2008-02-27 | $7700.00 | Window Closed / Lapsed |