DE2639109A1 - Copolymerisate des tetrafluoraethylens und verfahren zu deren herstellung - Google Patents

Copolymerisate des tetrafluoraethylens und verfahren zu deren herstellung

Info

Publication number
DE2639109A1
DE2639109A1 DE19762639109 DE2639109A DE2639109A1 DE 2639109 A1 DE2639109 A1 DE 2639109A1 DE 19762639109 DE19762639109 DE 19762639109 DE 2639109 A DE2639109 A DE 2639109A DE 2639109 A1 DE2639109 A1 DE 2639109A1
Authority
DE
Germany
Prior art keywords
mol
copolymerization
polymerization
hfp
liquor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19762639109
Other languages
German (de)
English (en)
Other versions
DE2639109C2 (https=
Inventor
Robert Dipl Chem Dr Hartwimmer
Juergen Dipl Chem Dr Kuhls
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoechst AG
Original Assignee
Hoechst AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Priority to DE19762639109 priority Critical patent/DE2639109A1/de
Priority to NLAANVRAGE7709463,A priority patent/NL185457C/xx
Priority to IT27057/77A priority patent/IT1085025B/it
Priority to JP10412477A priority patent/JPS5329389A/ja
Priority to CA285,724A priority patent/CA1102491A/en
Priority to GB36393/77A priority patent/GB1591541A/en
Priority to BE180586A priority patent/BE858291A/xx
Priority to FR7726404A priority patent/FR2363588A1/fr
Publication of DE2639109A1 publication Critical patent/DE2639109A1/de
Priority to US06/097,685 priority patent/US4262101A/en
Application granted granted Critical
Publication of DE2639109C2 publication Critical patent/DE2639109C2/de
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
    • C08F214/18—Monomers containing fluorine
    • C08F214/26—Tetrafluoroethene
    • C08F214/262—Tetrafluoroethene with fluorinated vinyl ethers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
DE19762639109 1976-08-31 1976-08-31 Copolymerisate des tetrafluoraethylens und verfahren zu deren herstellung Granted DE2639109A1 (de)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DE19762639109 DE2639109A1 (de) 1976-08-31 1976-08-31 Copolymerisate des tetrafluoraethylens und verfahren zu deren herstellung
NLAANVRAGE7709463,A NL185457C (nl) 1976-08-31 1977-08-26 Werkwijze voor het bereiden van tetrafluoretheencopolymeren, alsmede gevormd voortbrengsel.
IT27057/77A IT1085025B (it) 1976-08-31 1977-08-29 Copolimerizzati del tetrafluoroetilene e processo per la loro produzione
CA285,724A CA1102491A (en) 1976-08-31 1977-08-30 Copolymers of tetrafluoroethylene and process for their manufacture
JP10412477A JPS5329389A (en) 1976-08-31 1977-08-30 Tetrafluoroethylene copolymers and process for producing same
GB36393/77A GB1591541A (en) 1976-08-31 1977-08-31 Copolymers of tetrafluoroethylene and process for their manufacture
BE180586A BE858291A (fr) 1976-08-31 1977-08-31 Copolymeres du tetrafluorethylene
FR7726404A FR2363588A1 (fr) 1976-08-31 1977-08-31 Copolymeres du tetrafluorethylene
US06/097,685 US4262101A (en) 1976-08-31 1979-11-27 Copolymers of tetrafluoroethylene and process for their manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762639109 DE2639109A1 (de) 1976-08-31 1976-08-31 Copolymerisate des tetrafluoraethylens und verfahren zu deren herstellung

Publications (2)

Publication Number Publication Date
DE2639109A1 true DE2639109A1 (de) 1978-03-09
DE2639109C2 DE2639109C2 (https=) 1989-08-03

Family

ID=5986758

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19762639109 Granted DE2639109A1 (de) 1976-08-31 1976-08-31 Copolymerisate des tetrafluoraethylens und verfahren zu deren herstellung

Country Status (9)

Country Link
US (1) US4262101A (https=)
JP (1) JPS5329389A (https=)
BE (1) BE858291A (https=)
CA (1) CA1102491A (https=)
DE (1) DE2639109A1 (https=)
FR (1) FR2363588A1 (https=)
GB (1) GB1591541A (https=)
IT (1) IT1085025B (https=)
NL (1) NL185457C (https=)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0043499A1 (de) * 1980-06-28 1982-01-13 Hoechst Aktiengesellschaft Verfahren zur Herstellung von wässrigen, kolloidalen Dispersionen von Copolymerisaten des Typs Tetrafluorethylen-Ethylen
EP0087737A1 (de) * 1982-02-27 1983-09-07 Hoechst Aktiengesellschaft Perfluorierte Vinylether mit einem sekundären Wasserstoffatom, Polymere daraus, sowie Verfahren zur Herstellung der Monomeren
EP0117450A1 (en) * 1983-02-01 1984-09-05 Daikin Kogyo Co., Ltd. Fluorine-containing copolymers
EP0124378A1 (en) * 1983-05-02 1984-11-07 E.I. Du Pont De Nemours And Company Fluorinated alkyl ether-containing ethylenes, precursors thereto, and copolymers thereof with tetrafluoroethylene
DE2953298C2 (de) * 1978-10-31 1991-05-08 E.I. du Pont de Nemours and Co., 19898 Wilmington, Del. Überzug enthaltend Copolymere von perfluorierten Polyvinyläthern
EP0789038A1 (en) * 1995-08-17 1997-08-13 E.I. Du Pont De Nemours And Company Process for polymerization of copolymers of tetrafluoroethylene and hexafluoropropylene
DE19964006A1 (de) * 1999-12-30 2001-07-12 Dyneon Gmbh Tetrafluorethylen-Copolymere
EP3284762A1 (en) 2016-08-17 2018-02-21 3M Innovative Properties Company Fluoropolymers comprising tetrafluoroethene and one or more perfluorinated alkyl allyl ether comonomers

Families Citing this family (89)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1167858A (en) * 1978-08-28 1984-05-22 Dale G. Brown Cyanovinyl pyrethroids acid intermediates and pesticidal use
JPS5645911A (en) * 1979-09-25 1981-04-25 Asahi Glass Co Ltd Production of ion-exchangeable fluorinated polymer
US4515989A (en) * 1980-06-11 1985-05-07 The Dow Chemical Company Preparation decarboxylation and polymerization of novel acid flourides and resulting monomers
JPS5718710A (en) * 1980-07-08 1982-01-30 Asahi Glass Co Ltd Copolymer capable of giving elastomer containing fluorine having improved cold and oil resistance
JPS5869213A (ja) * 1981-09-21 1983-04-25 Daikin Ind Ltd 含フツ素共重合体
JPS58189210A (ja) * 1982-04-30 1983-11-04 Daikin Ind Ltd テトラフルオロエチレン／フルオロ（アルキルビニルエ−テル）共重合体の製法
US4703095A (en) * 1983-02-01 1987-10-27 Daiken Kogyo Co., Ltd. Fluorine-containing copolymer
US4521574A (en) * 1984-02-27 1985-06-04 The Goodyear Tire & Rubber Company Incorporation of functionalized monomers
US4714756A (en) * 1985-10-23 1987-12-22 E. I. Du Pont De Nemours And Company Process for preparing melt processible tetrafluoroethylene copolymer granules
US4675380A (en) * 1985-10-25 1987-06-23 E. I. Du Pont De Nemours And Company Melt-processible tetrafluoroethylene/perfluoroolefin copolymer granules and processes for preparing them
US4742122A (en) * 1985-10-25 1988-05-03 E. I. Du Pont De Nemours And Company Melt-processible tetrafluoroethylene/perfluoroolefin copolymers and processes for preparing them
EP0222945B1 (en) * 1985-11-08 1992-01-02 E.I. Du Pont De Nemours And Company Melt-processible tetrafluoroethylene/perfluoroolefin copolymers and processes for preparing them
EP0226668B1 (en) * 1985-11-08 1992-01-08 E.I. Du Pont De Nemours And Company Process for treating melt-processible tetrafluoroethylene/perfluoro(alkyl vinyl)- ether copolymers
JPS62260807A (ja) * 1986-05-07 1987-11-13 Nippon Mektron Ltd 含フッ素重合体の製造方法
US4792117A (en) * 1987-04-09 1988-12-20 Kitz Corporation Material for valve seats
US4952636A (en) * 1987-12-31 1990-08-28 E. I. Du Pont De Nemours And Company Modified polytetrafluoroethylene resins and blends thereof
US4879362A (en) * 1987-12-31 1989-11-07 E. I. Dupont De Nemours And Company Modified polytetrafluoroethylene resins
JP2853254B2 (ja) * 1990-04-04 1999-02-03 ダイキン工業株式会社 クロロトリフルオロエチレン／パーフルオロ（アルキルビニルエーテル）共重合体
DE4332712A1 (de) * 1993-09-25 1995-03-30 Hoechst Ag Verfahren zur Herstellung eines modifizierten Polytetrafluorethylens und seine Verwendung
DE4335705A1 (de) * 1993-10-20 1995-04-27 Hoechst Ag Herstellung eines modifizierten Polytetrafluorethylens und seine Verwendung
JPH08333408A (ja) * 1995-06-07 1996-12-17 Asahi Glass Co Ltd 含フッ素共重合体の製造方法
EP0798575A3 (en) * 1996-03-25 2000-03-29 Rohm And Haas Company Flexible sheathing and cladding
DE19805832A1 (de) 1998-02-13 1999-08-19 Dyneon Gmbh Mischungen aus thermoplastischen Fluorpolymeren
WO2000002935A1 (fr) * 1998-07-13 2000-01-20 Daikin Industries, Ltd. Fine poudre de polytetrafluoroethylene modifie et procede de fabrication
DE19903657A1 (de) * 1999-01-29 2000-08-03 Dyneon Gmbh Tetrafluorethylen/Hexafluorpropylen-Copolymere mit besserer Aufziehbarkeit
US6242548B1 (en) 1999-05-13 2001-06-05 Dyneon Llc Fluoroplastic polymers with improved characteristics
US6277919B1 (en) 1999-05-13 2001-08-21 Dyneon Llc Polymer processing additive containing a multimodal fluoropolymer and melt processable thermoplastic polymer composition employing the same
JP4882194B2 (ja) * 1999-11-29 2012-02-22 ダイキン工業株式会社 低薬液透過性含フッ素樹脂材料
JP4599640B2 (ja) * 1999-11-29 2010-12-15 ダイキン工業株式会社 含フッ素共重合体および低薬液透過性含フッ素樹脂組成物
US6686426B2 (en) 1999-12-30 2004-02-03 3M Innovative Properties Company Perfluoro copolymers of tetrafluoroethylene and perflouro alkyl vinyl ethers
JP4792622B2 (ja) * 2000-05-30 2011-10-12 旭硝子株式会社 テトラフルオロエチレン／パーフルオロ（アルキルビニルエーテル）共重合体及びその製造方法
CA2382525A1 (en) * 2000-06-01 2001-12-06 3M Innovative Properties Company High purity fluoropolymers
US7125941B2 (en) * 2001-03-26 2006-10-24 3M Innovative Properties Company Aqueous emulsion polymerization process for producing fluoropolymers
WO2002088207A1 (en) 2001-05-02 2002-11-07 3M Innovative Properties Company Emulsifier free aqueous emulsion polymerization process for making fluoropolymers
JP4624646B2 (ja) * 2001-05-02 2011-02-02 スリーエム イノベイティブ プロパティズ カンパニー フルオロポリマーを製造するための連鎖移動剤としてのエーテルの存在下での水性乳化重合
US7045571B2 (en) * 2001-05-21 2006-05-16 3M Innovative Properties Company Emulsion polymerization of fluorinated monomers
US6737489B2 (en) 2001-05-21 2004-05-18 3M Innovative Properties Company Polymers containing perfluorovinyl ethers and applications for such polymers
DE60209224T2 (de) * 2001-06-18 2006-07-27 Daikin Industries, Ltd. Verwendung von Pulverlack
US6653379B2 (en) * 2001-07-12 2003-11-25 3M Innovative Properties Company Fluoropolymers resistant to stress cracking
US7279522B2 (en) 2001-09-05 2007-10-09 3M Innovative Properties Company Fluoropolymer dispersions containing no or little low molecular weight fluorinated surfactant
US7060772B2 (en) * 2001-09-20 2006-06-13 3M Innovative Properties Company Fluoropolymers from tetrafluoroethylene and perfluoro(alkoxyalkyl vinyl) ether
US6703464B2 (en) * 2002-01-17 2004-03-09 Daikin America, Inc. Flourine-containing copolymer
US7176265B2 (en) * 2002-11-22 2007-02-13 E. I. Du Pont De Nemours And Company Directly polymerized low molecular weight granular polytetrafluoroethylene
EP1533325B1 (en) * 2003-11-17 2011-10-19 3M Innovative Properties Company Aqueous dispersions of polytetrafluoroethylene having a low amount of fluorinated surfactant
EP1570917B1 (en) * 2004-03-01 2009-06-10 3M Innovative Properties Company Method of coating a substrate with a fluoropolymer dispersion
US7495051B2 (en) * 2004-09-27 2009-02-24 3M Innovative Properties Company Nanocomposite and method of making the same
GB2427170A (en) * 2005-06-17 2006-12-20 3M Innovative Properties Co Fluoropolymer film having glass microspheres
GB0514387D0 (en) * 2005-07-15 2005-08-17 3M Innovative Properties Co Aqueous emulsion polymerization of fluorinated monomers using a perfluoropolyether surfactant
US7671112B2 (en) * 2005-07-15 2010-03-02 3M Innovative Properties Company Method of making fluoropolymer dispersion
GB0525978D0 (en) * 2005-12-21 2006-02-01 3M Innovative Properties Co Fluorinated Surfactants For Making Fluoropolymers
GB0514398D0 (en) * 2005-07-15 2005-08-17 3M Innovative Properties Co Aqueous emulsion polymerization of fluorinated monomers using a fluorinated surfactant
US20080015304A1 (en) 2006-07-13 2008-01-17 Klaus Hintzer Aqueous emulsion polymerization process for producing fluoropolymers
GB0523853D0 (en) 2005-11-24 2006-01-04 3M Innovative Properties Co Fluorinated surfactants for use in making a fluoropolymer
GB2430437A (en) * 2005-09-27 2007-03-28 3M Innovative Properties Co Method of making a fluoropolymer
KR20080053518A (ko) * 2005-09-30 2008-06-13 듀폰-미쯔이 플루오로케미칼 가부시끼가이샤 균일하게 분포된 나노-크기의 무기 입자를 갖는 중합체조성물
US7728087B2 (en) 2005-12-23 2010-06-01 3M Innovative Properties Company Fluoropolymer dispersion and method for making the same
CN103254345A (zh) * 2006-02-23 2013-08-21 索尔维索莱克西斯公司 Lan电缆
US7754795B2 (en) * 2006-05-25 2010-07-13 3M Innovative Properties Company Coating composition
US20070276103A1 (en) * 2006-05-25 2007-11-29 3M Innovative Properties Company Fluorinated Surfactants
US8119750B2 (en) 2006-07-13 2012-02-21 3M Innovative Properties Company Explosion taming surfactants for the production of perfluoropolymers
US7678859B2 (en) * 2006-09-14 2010-03-16 3M Innovative Properties Company Preparation and stabilization of fluoropolymer dispersions
US20080081182A1 (en) * 2006-10-02 2008-04-03 Pham Hoai Nam Fluoropolymer blends with inorganic layered compounds
CN101605728B (zh) * 2007-02-16 2013-07-24 3M创新有限公司 用于从水中去除含氟化合物的系统和方法
US20080264864A1 (en) * 2007-04-27 2008-10-30 3M Innovative Properties Company PROCESS FOR REMOVING FLUORINATED EMULSIFIER FROM FLUOROPOLMER DISPERSIONS USING AN ANION-EXCHANGE RESIN AND A pH-DEPENDENT SURFACTANT AND FLUOROPOLYMER DISPERSIONS CONTAINING A pH-DEPENDENT SURFACTANT
GB0716421D0 (en) 2007-08-23 2007-10-03 3M Innovative Properties Co Method of preparing fluoropolymers by aqueous emulsion polymerization
US7999049B2 (en) * 2008-01-22 2011-08-16 Dupont Performance Elastomers L.L.C. Process for producing fluoroelastomers
CN102070740B (zh) * 2010-11-16 2012-10-03 巨化集团公司 一种含氟微乳液的制备方法
CN102344519B (zh) * 2011-07-13 2013-04-10 山东东岳高分子材料有限公司 适用于加工毛细管的改性聚四氟乙烯分散树脂的生产方法
CN107522810B (zh) * 2011-08-29 2020-10-16 大金工业株式会社 含氟聚合物粉末、覆膜以及含氟聚合物粉末的制造方法
BR112014023738B1 (pt) * 2012-03-26 2021-03-09 Technip France tubo de fluoropolímero
JP5665800B2 (ja) * 2012-06-22 2015-02-04 三井・デュポンフロロケミカル株式会社 テトラフルオロエチレン／パーフルオロ（アルキルビニルエーテル）共重合体
US9988476B2 (en) 2012-12-05 2018-06-05 Solvay Specialty Polymers Italy S.P.A. Melt-processable perfluoropolymers having improved thermal and mechanical properties after heating treatment
JP6166577B2 (ja) * 2013-04-16 2017-07-19 三井・デュポンフロロケミカル株式会社 フッ素樹脂組成物、及びその成形物
KR101934225B1 (ko) * 2015-01-20 2018-12-31 다이킨 고교 가부시키가이샤 불소 수지의 개질 성형품의 제조 방법
JP6742321B2 (ja) * 2015-09-08 2020-08-19 Ａｇｃ株式会社 変性ポリテトラフルオロエチレンファインパウダー、その製造方法、およびチューブまたはホースの製造方法
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CN112679647B (zh) * 2020-12-23 2022-11-11 山东华夏神舟新材料有限公司 细乳液聚合法制备高固含量可熔性聚四氟乙烯乳液的方法
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CN116867824A (zh) * 2021-02-26 2023-10-10 大金工业株式会社 含氟共聚物
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EP4299275B1 (en) 2021-02-26 2026-03-18 Daikin Industries, Ltd. Injection-molded body and production method therefor
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WO2022181719A1 (ja) 2021-02-26 2022-09-01 ダイキン工業株式会社 射出成形体
EP4299604A4 (en) * 2021-02-26 2025-01-08 Daikin Industries, Ltd. Copolymer, molded body, injection molded body, and coated electrical wire
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1240669B (de) * 1961-06-23 1967-05-18 Du Pont Verfahren zur Herstellung von elastomeren Mischpolymerisaten
DE1806097A1 (de) * 1967-10-30 1969-05-29 Du Pont Verfahren zur Mischpolymerisation von Tetrafluoraethylen
DE2019150A1 (de) * 1969-04-22 1970-11-12 Du Pont Mischpolymerisate aus Tetrafluoraethylen und Fluoralkyl-perfluorvinylaethern sowie Verfahren zur Herstellung derselben
DE2052495A1 (de) * 1969-10-27 1971-05-06 Du Pont Verfahren zum Mischpolymensieren von monomerem Tetrafluorethylen und monomerem Fluorvinylather
DE2710501C2 (de) * 1976-03-10 1983-02-24 E.I. du Pont de Nemours and Co., 19898 Wilmington, Del. Terpolymere auf der Basis von Tetrafluoräthylen

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US2975163A (en) * 1956-10-29 1961-03-14 Minnesota Mining & Mfg Fluorine containing organic compounds and preparation thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1240669B (de) * 1961-06-23 1967-05-18 Du Pont Verfahren zur Herstellung von elastomeren Mischpolymerisaten
DE1806097A1 (de) * 1967-10-30 1969-05-29 Du Pont Verfahren zur Mischpolymerisation von Tetrafluoraethylen
DE2019150A1 (de) * 1969-04-22 1970-11-12 Du Pont Mischpolymerisate aus Tetrafluoraethylen und Fluoralkyl-perfluorvinylaethern sowie Verfahren zur Herstellung derselben
DE2052495A1 (de) * 1969-10-27 1971-05-06 Du Pont Verfahren zum Mischpolymensieren von monomerem Tetrafluorethylen und monomerem Fluorvinylather
DE2710501C2 (de) * 1976-03-10 1983-02-24 E.I. du Pont de Nemours and Co., 19898 Wilmington, Del. Terpolymere auf der Basis von Tetrafluoräthylen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2953298C2 (de) * 1978-10-31 1991-05-08 E.I. du Pont de Nemours and Co., 19898 Wilmington, Del. Überzug enthaltend Copolymere von perfluorierten Polyvinyläthern
EP0043499A1 (de) * 1980-06-28 1982-01-13 Hoechst Aktiengesellschaft Verfahren zur Herstellung von wässrigen, kolloidalen Dispersionen von Copolymerisaten des Typs Tetrafluorethylen-Ethylen
EP0087737A1 (de) * 1982-02-27 1983-09-07 Hoechst Aktiengesellschaft Perfluorierte Vinylether mit einem sekundären Wasserstoffatom, Polymere daraus, sowie Verfahren zur Herstellung der Monomeren
EP0117450A1 (en) * 1983-02-01 1984-09-05 Daikin Kogyo Co., Ltd. Fluorine-containing copolymers
EP0124378A1 (en) * 1983-05-02 1984-11-07 E.I. Du Pont De Nemours And Company Fluorinated alkyl ether-containing ethylenes, precursors thereto, and copolymers thereof with tetrafluoroethylene
EP0789038A1 (en) * 1995-08-17 1997-08-13 E.I. Du Pont De Nemours And Company Process for polymerization of copolymers of tetrafluoroethylene and hexafluoropropylene
DE19964006A1 (de) * 1999-12-30 2001-07-12 Dyneon Gmbh Tetrafluorethylen-Copolymere
EP3284762A1 (en) 2016-08-17 2018-02-21 3M Innovative Properties Company Fluoropolymers comprising tetrafluoroethene and one or more perfluorinated alkyl allyl ether comonomers
WO2018034838A1 (en) 2016-08-17 2018-02-22 3M Innovative Properties Company Fluoropolymers comprising tetrafluoroethylene and one or more perfluorinated alkyl allyl ether comonomers

Also Published As

Publication number Publication date
JPS5329389A (en) 1978-03-18
FR2363588A1 (fr) 1978-03-31
CA1102491A (en) 1981-06-02
DE2639109C2 (https=) 1989-08-03
NL7709463A (nl) 1978-03-02
IT1085025B (it) 1985-05-28
NL185457C (nl) 1990-04-17
GB1591541A (en) 1981-06-24
FR2363588B1 (https=) 1984-05-11
US4262101A (en) 1981-04-14
BE858291A (fr) 1978-02-28
JPS6224444B2 (https=) 1987-05-28

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