Free radical chemistry. Part 5. [1] A new approach to the synthesis of perfluorinated ethers
作者:Richard D. Chambers、Brian Grievson、Frederick G. Drakesmith、Richard L. Powell
DOI:10.1016/s0022-1139(00)82331-3
日期:1985.9
Fluorinations of the free-radical adducts of fluorinated alkenes, to ethers, overcobalttrifluoride are described and perfluorinated ethers are obtained at temperatures in excess of 400°C. The effect of structure on the formation of perfluoroethers is outlined.
Free-radical chemistry. Part 8[1]. Electrochemical fluorination of partly fluorinated ethers
作者:Richard D. Chambers、Robert W. Fuss、Michael Jones、Peter Sartori、Alan P. Swales、Ralf Herkelmann
DOI:10.1016/s0022-1139(00)85035-6
日期:1990.9
Free-radical additions of hexafluoropropene to cyclic ethers may be carried out to achieve mono- or di-adducts and mixtures of isomers of di-adducts are formed. These adducts may be fluorinated, using electrochemical fluorination, to give the corresponding perfluoro-ethers and, in some cases, with surprising efficiency. Adducts of acyclic ethers are less efficiently fluorinated.
FLUORORESIN, FLUORORESIN PARTICLES, AND METHODS FOR PRODUCING THESE
申请人:Tosoh Corporation
公开号:EP3858873A1
公开(公告)日:2021-08-04
The present invention relates to resin particles including a residue unit represented by the following general formula (1) and having a volume average particle diameter equal to or more than 5 µm and equal to or less than 2000 µm, and a method for producing thereof. Fruthermore the present invention relates to a fluororesin comprising a residue unit represented by a general formula (1) and having a weight average molecular weight Mw in a range of 5 × 104 to 3 × 105, and a yellow index of a heat-melted molded product (thickness 3 mm) after 24 h at 280°C of equal to or less than 6, and a method for producing thereof.
In the formula (1), Rf1, Rf2, Rf3, and Rf4 are each independently one of the groups consisting of a fluorine atom, a linear perfluoroalkyl group having 1 to 7 carbon atoms, a branched perfluoroalkyl group having 3 to 7 carbon atoms, or a cyclic perfluoroalkyl group having 3 to 7 carbon atoms. The perfluoroalkyl group may have an ethereal oxygen atom. Further, Rf1, Rf2, Rf3, and Rf4 may be linked to one another to form a ring having 4 or more and 8 or less carbon atoms, and the ring may include an ethereal oxygen atom.
FLUORORESIN, METHOD FOR PRODUCING SAME, AND METHOD FOR PRODUCING FLUORORESIN PARTICLES
申请人:Tosoh Corporation
公开号:EP3865521A1
公开(公告)日:2021-08-18
The present invention relates to a fluororesin including a residue unit represented by a following general formula (1) and having a haze value equal to or less than 2% of a heat-press molded product (thickness 1 mm) with a small haze value of a melt-molded product and a method for producing the same.
In the formula (1), Rf1, Rf2, Rf3 and Rf4 each independently represent one of the groups consisting of a fluorine atom, a linear perfluoroalkyl group having 1 to 7 carbon atoms, a branched perfluoroalkyl group having 3 to 7 carbon atoms, and a cyclic perfluoroalkyl group having 3 to 7 carbon atoms, the perfluoroalkyl group may have an ethereal oxygen atom, Rf1, Rf2, Rf3 and Rf4 may be linked to each other to form a ring having 4 or more and 8 or less carbon atoms, and the ring may include an ethereal oxygen atom. The present invention further relates to a method for producing fluororesin particles that each include a fluorine-containing aliphatic ring structure. The method comprises a precipitation step of lowering a solution temperature of a fluororesin (A) solution in which a fluororesin (A) including a fluorine-containing aliphatic ring structure is dissolved in a solvent (B), to precipitate particles of the fluororesin (A). The method is excelling in productivity and making it possible to remove foreign matter.