GB574688A - Improvements in or relating to the polymerisation of tetrafluorethylene - Google Patents

Improvements in or relating to the polymerisation of tetrafluorethylene

Info

Publication number
GB574688A
GB574688A GB12007/43A GB1200743A GB574688A GB 574688 A GB574688 A GB 574688A GB 12007/43 A GB12007/43 A GB 12007/43A GB 1200743 A GB1200743 A GB 1200743A GB 574688 A GB574688 A GB 574688A
Authority
GB
United Kingdom
Prior art keywords
sodium
tetrafluorethylene
ammonium
weak acids
pressure
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.)
Expired
Application number
GB12007/43A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB574688A publication Critical patent/GB574688A/en
Expired 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
    • C08F114/00—Homopolymers 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
    • C08F114/18—Monomers containing fluorine
    • C08F114/26—Tetrafluoroethene
    • 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
    • C08F14/00—Homopolymers and 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
    • C08F14/18—Monomers containing fluorine
    • C08F14/26—Tetrafluoroethene

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Tetrafluorethylene is polymerized at elevated temperature and pressure in the presence of water and oxygen, ozone or an organic peroxide. Preferred temperatures are between 55 DEG and 240 DEG C. and pressures between 1000 and 4000 pounds per square inch. The pressure may be increased by the presence of an inert gas, e.g. carbon dioxide, hydrogen or nitrogen. The water is preferably made alkaline by addition of caustic soda or potash, lime, barium hydroxide, sodium, potassium, ammonium or sodium carbonates or ammonium hydroxide. Alkali metal, alkaline earth metal and ammonium salts of weak acids and aliphatic amines and their salts with weak acids may also be used. Suitable peroxides are diacetyl, dipropionyl, dibutyryl, dibenzoyl, benzoylacetyl, diethyl, dipropyl, cyclohexanone, tetrahydronaphthalene and diethyl ether peroxides. The process may be carried out continuously and the catalyst may be injected into the reaction zone at one or several points. Unreacted tetrafluorethylene may be recycled. The apparatus is made of or lined with mild or stainless steel, silver, nickel, tantalum, glass or porcelain. The products may be used for making flexible tubing, gaskets, valve packings, pump diaphragms, bottle cap liners, linings for containers and for electric insulation. Sodium difluoroacetate may be recovered from the aqueous solution resulting from the polymerization by precipitating sodium fluoride as calcium fluoride, evaporating the filtrate to dryness, extracting with absolute alcohol and crystallizing.
GB12007/43A 1942-07-23 1943-07-23 Improvements in or relating to the polymerisation of tetrafluorethylene Expired GB574688A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4520842A 1942-07-23 1942-07-23

Publications (1)

Publication Number Publication Date
GB574688A true GB574688A (en) 1946-01-16

Family

ID=22009277

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12007/43A Expired GB574688A (en) 1942-07-23 1943-07-23 Improvements in or relating to the polymerisation of tetrafluorethylene

Country Status (1)

Country Link
GB (1) GB574688A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5399640A (en) * 1993-08-27 1995-03-21 W. L. Gore & Associates, Inc. Polymerization of liquid tetrafluoroethylene in aqueous dispersion
US5616648A (en) * 1993-08-27 1997-04-01 W. L. Gore & Associates, Inc. Microemulsion of polytetrafluoroethylene particles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5399640A (en) * 1993-08-27 1995-03-21 W. L. Gore & Associates, Inc. Polymerization of liquid tetrafluoroethylene in aqueous dispersion
US5403900A (en) * 1993-08-27 1995-04-04 W. L. Gore & Associates, Inc. Polymerization of liquid tetrafluoroethylene in aqueous dispersion
US5616648A (en) * 1993-08-27 1997-04-01 W. L. Gore & Associates, Inc. Microemulsion of polytetrafluoroethylene particles

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