EP0093404A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for preparing tetrafluoroethylene/fluoro(alkyl vinyl ether) copolymer
Assignee: Daikin Industries Ltd
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Filing: 1983-04-28
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Granted: —
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Expires: 2003-04-28
Abstract
Abstract A process for preparing a tetrafluoroethylene/fluoro(alkyl vinyl ether) copolymer comprising polymerizing tetrafluoroethylene and fluoro(alkyl vinyl ether) in an aqueous suspension system which comprises a mixed medium of water and a fluorohydrocarbon or a chlorofluorohydrocarbon in a volume ratio of from 1 1 to 10: 1 at a temperature of from 0 to 25°C in the presence of a polymerization initiator of the formula: wherein n is an integer of 1 to 10, the copolymer obtained by the process having a small number of unstable terminal groups and excellent flex life.
Inventors
- 👤 Shinichi Nakagawa
- 👤 Tsuneo Nakagawa
- 👤 Sadaatsu Yamaguchi
- 👤 Kiyohiko Ihara
- 👤 Toshihiko Amano
- 👤 Mitsugu Omori
- 👤 Kohzoh Asano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 09:44
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
A process for preparing a TFE/FAVE copolymer comprising polymerizing tetrafluoroethylene and fluoro(alkyl vinyl ether) in an aqueous suspension system which comprises a mixed medium of water and a fluorohydrocarbon or a chlorofluorohydrocarbon in a volume ratio of from 1 : 1 to 10 : 1 at a temperature of from 0 to 25°C in the presence of a polymerization initiator of the formula: wherein n is an integer of 1 to 10.
Claim 2
Dependent Claim
72 words
A process for preparing a TFE/FAVE copolymer comprising polymerizing tetrafluoroethylene and fluoro(alkyl vinyl ether) in an aqueous suspension system which comprises a mixed medium of water and a fluorohydrocarbon or a chlorofluorohydrocarbon in a volume ratio of from 1 : 1 to 10 : 1 at a temperature of from 0 to 25°C in the presence of a polymerization initiator of the formula: wherein n is an integer of 1 to 10.
Claim 3
Dependent Claim
26 words
The process according to claim 1, wherein the polymerization initiator is a compound of the formula (I) wherein n is an integer of 1 to 4.
Claim 4
Dependent Claim
16 words
The process according to claim 1, wherein the polymerization initiator is a compound of the formula:
Claim 5
Dependent Claim
39 words
The process according to claim 1, wherein fluoro(alkyl vinyl ether) is a compound of the formula: wherein X is hydrogen or fluorine, a is an integer of 0 to 4 and b is an integer of 0 to 7.
Claim 6
Dependent Claim
27 words
The process according to claim 4, wherein fluoro(alkyl vinyl ether) is one selected from the group consisting of perfluoro(methyl vinyl ether), perfluoro(ethyl vinyl ether), perfluoro(propyl vinyl ether),
Claim 7
Dependent Claim
25 words
The process according to claim 1, wherein the weight ratio of tetrafluoroethylene and fluoro(alkyl vinyl ether) is from 1 : 1 to 10 : 1.
Claim 8
Dependent Claim
25 words
The process according to claim 1, wherein the volume ratio of water and fluorohydrocarbon or chlorofluorohydrocarbon is from 1.5 : 1 to 5 : 1.
Claim 9
Dependent Claim
26 words
The process according to claim 1, wherein the fluorohydrocarbon or the chlorofluorohydrocarbon is one selected from the group consisting of 1,1,2-trichloro-1,2,2-trifluoroethane, 1,2-dichloro-I,1,2,2-tetrafluoroethane, trichlorofluoromethane, dichlorodifluoromethane and perfluorocyclobutane.
Claim 10
Dependent Claim
15 words
the process according to claim 1, wherein the reaction temperature is from 5 to 15°C.
Claim 11
Dependent Claim
24 words
The process according to claim 1, wherein the reaction pressure is from 0.5 to 15 Kg/cm 2 G, preferably from 1 to 10 Kg/cm2G.
References Cited (Backward Citations)
No citation records indexed.
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