EP0219065A2
Expired / Lapsed
EP
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Novel elastomeric fluoropolymer and preparation thereof
Assignee: Daikin Industries Ltd
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Filing: 1986-10-09
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Granted: —
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Expires: 2006-10-09
Abstract
Abstract An elastomeric fluoropolymer comprising 12 to 50 % by mole of repeating units derived from a perfluorovinyl ether of the formula: CF₂=CFO-(CF₂CFXO) m -R f (I) wherein R f is a C₁-C₆ perfluoroalkyl group, X is a fluorine atom or a trifluoromethyl group and m is an integer of 1 to 5, 50 to 88 % by mole of repeating units derived from tetrafluoroethylene and 0.1 to 5 % by mole of repeating units of hexafluoropropylene having improved strength and compression set.
Inventors
- 👤 Shigeru Morita
- 👤 Kazuhiko Kuwahara
- 👤 Masayasu Tomoda
- 👤 Masahiko Oka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 08:20
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262; C08F2438/00; C08F2438/01
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
An elastomeric fluoropolymer comprising 12 to 50 % by mole of repeating units derived from a perfluorovinyl ether of the formula: CF₂=CFO-(CF₂CFXO) m -R f (I) wherein R f is a C₁-C₆ perfluoroalkyl group, X is a fluorine atom or a trifluoromethyl group and m is an integer of 1 to 5, 50 to 88 % by mole of repeating units derived from tetrafluoroethylene and 0.1 to 5 % by mole of repeating units of hexafluoropropylene.
Claim 2
Dependent Claim
76 words
An elastomeric fluoropolymer comprising 12 to 50 % by mole of repeating units derived from a perfluorovinyl ether of the formula: CF₂=CFO-(CF₂CFXO) m -R f (I) wherein R f is a C₁-C₆ perfluoroalkyl group, X is a fluorine atom or a trifluoromethyl group and m is an integer of 1 to 5, 50 to 88 % by mole of repeating units derived from tetrafluoroethylene and 0.1 to 5 % by mole of repeating units of hexafluoropropylene.
Claim 3
Dependent Claim
19 words
The elastomeric fluoropolymer according to claim 1, wherein R f in the formula (I) is a C₂-C₄ perfluoroalkyl group.
Claim 4
Dependent Claim
15 words
The elastomeric fluoropolymer according to claim 1, wherein m in the formula (I) is 1.
Claim 5
Dependent Claim
15 words
The elastomeric fluoropolymer according to claim 1, wherein m in the formula (I) is 2.
Claim 6
Dependent Claim
18 words
The elastomeric fluoropolymer according to claim 1 which has a number average molecular weight of 20,000 to 500,000.
Claim 7
Dependent Claim
92 words
A process for preparing an elastomeric fluoropolymer comprising 12 to 50 % by mole of repeating units derived from a perfluorovinyl ether of the formula: CF₂-CFO-(CF₂CFXO) m -R f (I) wherein R f is a C₁-C₆ perfluoroalkyl group, X is a fluorine atom or a trifluoromethyl group and m is an integer of 1 to 5, 50 to 88 % by mole of repeating units derived from tetrafluoroethylene and 0.1 to 5 % by mole of repeating units of hexafluoropropylene, which method comprises emulsion copolymerizing the perfluorovinyl ether (I), tetrafluoroethylene and hexafluoropropylene.
Claim 8
Dependent Claim
92 words
A process for preparing an elastomeric fluoropolymer comprising 12 to 50 % by mole of repeating units derived from a perfluorovinyl ether of the formula: CF₂-CFO-(CF₂CFXO) m -R f (I) wherein R f is a C₁-C₆ perfluoroalkyl group, X is a fluorine atom or a trifluoromethyl group and m is an integer of 1 to 5, 50 to 88 % by mole of repeating units derived from tetrafluoroethylene and 0.1 to 5 % by mole of repeating units of hexafluoropropylene, which method comprises emulsion copolymerizing the perfluorovinyl ether (I), tetrafluoroethylene and hexafluoropropylene.
Claim 9
Dependent Claim
59 words
The process according to claim 6, wherein the emulsion polymerization is carried out in the presence of an emulsifier of the formula: R f O-(CFXCF₂O) n CFXCOOM (II) wherein R f and X are the same as defined above, M is a hydrogen, an ammonium group or an alkali metal and n is an integer of 0 to 5.
Claim 10
Dependent Claim
20 words
The process according to claim 6, wherein the polymerization is carried out in the presence of a chain transfer agent.
Claim 11
Dependent Claim
15 words
The process according to claim 8, wherein the chain transfer agent is a fluorocarbon iodide.
References Cited (Backward Citations)
No citation records indexed.
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