GB574688A - Improvements in or relating to the polymerisation of tetrafluorethylene - Google Patents
Improvements in or relating to the polymerisation of tetrafluorethyleneInfo
- 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
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.
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)
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 |
-
1943
- 1943-07-23 GB GB12007/43A patent/GB574688A/en not_active Expired
Cited By (3)
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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