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Patent EP0457255A2 successfully refreshed from Google Patents.
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EP0457255A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Tetrafluoroethylene copolymer and process for preparing the same

Assignee: Daikin Industries Ltd
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Filing: 1991-05-14
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Granted: —
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Expires: 2011-05-14
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Abstract

Abstract A copolymer of tetrafluoroethylene and a perfluoro(alkyl vinyl ether) having the formula (I): CF₂=CF-O-Rf   (I) wherein Rf is a perfluoroalkyl group having 3 or 4 carbon atoms; said copolymer having 1 to 10 % by weight of the perfluoro(alkyl vinyl ether) units, having 7 to 20, per 10⁶ carbon atoms, of terminal groups -CONH₂, having substantially no -CH₂OH and no -COF, and having a melt viscosity at 380°C of 0.1 x 10⁴ to 100 x 10⁴ poise and a preparation process thereof. The tetrafluoroethylene copolymer is thermally stable and has excellent powder properties. Molded articles thereform have a few bubbles and excellent dimensional stability on heating.

Inventors

  • 👤 Kiyohiko C/O Yodogawa Seisakusho Ihara
  • 👤 Katsuhide C/O Yodogawa Seisakusho Ohtani
  • 👤 Yutaka C/O Yodogawa Seisakusho Nakata
  • 👤 Toshio C/O Yodogawa Seisakusho Miyatani

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 13:17
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262; C08F8/00; C08F8/44; C08F2800/00; C08F2800/20

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 77 words
A copolymer of tetrafluoroethylene and a perfluoro(alkyl vinyl ether) having the formula (I): CF₂=CF-O-Rf   (I) wherein Rf is a perfluoroalkyl group having 3 or 4 carbon atoms; said copolymer having 1 to 10 % by weight of the perfluoro(alkyl vinyl ether) units, having 7 to 20, per 10⁶ carbon atoms, of terminal groups -CONH₂, having substantially no -CH₂OH and no -COF, and having a melt viscosity at 380°C of 0.1 x 10⁴ to 100 x 10⁴ poise.
Claim 2
Dependent Claim 173 words
A process for preparing a copolymer of tetrafluoroethylene and a perfluoro(alkyl vinyl ether) having the formula (I): CF₂=CF-O-Rf   (I) wherein Rf is a perfluoroalkyl group having 3 or 4 carbon atoms; said copolymer having 1 to 10 % by weight of the perfluoro(alkyl vinyl ether) units, having 7 to 20, per 10⁶ carbon atoms, of terminal groups -CONH₂, having substantially no -CH₂OH and no -COF, and having a melt viscosity at 380°C of 0.1 x 10⁴ to 100 x 10⁴ poise which comprises: contacting a copolymer of tetrafluoroethylene and a perfluoro(alkyl vinyl ether) having the formula (I): CF₂=CF-O-Rf   (I) wherein Rf is as defined above, said copolymer having 1 to 10 % by weight of the perfluoro(alkyl vinyl ether) units with fluorine gas to give the copolymer having the total number of terminal groups -COF and terminal groups -COOH of 7 to 40 per 10⁶ carbon atoms, and contacting the resulting copolymer with ammonia gas or a gaseous nitrogen-containing compound capable of forming ammonia gas to convert the termimal groups -COF into -CONH₂.

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