摘要:
Monomers of the formula (I) (for example, 3,3,4,4,5,5,6,6-octafluoromethylenecyclopentane) are described, as well as copolymers prepared from them and from one or more monomers copolymerizable with them. ##STR1## wherein n=3 to 5 The compounds are suitable for the production of a multiplicity of thermoplastically processable copolymers having various sets of properties which permit applications both as compact moulded parts and as coatings.
摘要:
A 2-allyl-perfluoroalkyl-trifluorovinyl ether of the formula ##STR1## wherein R.sup.1.sub.F and R.sup.2.sub.F represent either --CF.sub.3 or, together, (CF.sub.2).sub.n where n=2 or 3,is produced bya) reacting hexafluoropropene oxide with a 2-allyl-substituted perfluorocycloketone or perfluoroketone,b) subjecting the resulting 2-(allylperfluorocycloalkoxy)- or 2-(allylperfluyoro-alkoxy)-perfluoropropanoic acid fluoride to alkaline saponification thereby to form the corresponding sodium salt,c) and decarboxylating the sodium salt at about 150.degree.-350.degree. C.Polymers thereof produce amorphous, transparent coatings or molded items with glass transition temperatures between 60.degree. and 150.degree. C. and have good solubility characteristics in a number of organic solvents.
摘要:
A 2-allyl-perfluoroalkyl-trifluorovinyl ether of the formula ##STR1## wherein R.sup.1.sub.F and R.sup.2.sub.F represent either --CF.sub.3 or, together, (CF.sub.2).sub.n where n=2 or 3.
摘要:
The present invention relates to fluoropolymers with improved temperature resistance and dimensional stability in the heat based on fluoroethylenes, using perfluoro-(cycloalkyl-vinyl ethers) and optionally other monomers as comonomers. The invention also relates to the perfluor-(cycloalkyl-vinyl ethers) which impart the advantageous thermal properties to the fluoropolymers according to the invention.
摘要:
Halogenated aromatic compounds are prepared by passing esters of halogenoformic acid at temperatures in the range 150.degree. to 600.degree. C. and pressures from 0.1 to 3 bar over a catalyst containing chromium, magnesium, iron, silicon and/or aluminium, wherein if Al.sub.2 O.sub.3 catalysts are used these have been activated with hydrogen halide.
摘要翻译:卤代芳族化合物通过在含有铬,镁,铁,硅和/或铝的催化剂上通过使卤代甲酸的酯在150℃至600℃的温度和0.1至3巴的压力下进行制备,其中如果Al 2 O 3催化剂 使用这些已被卤化氢活化。
摘要:
1,1,1,4,4,4-hexafluoro-chlorobutenes are obtained by pyrolysis of 1,1,1-trifluoro-2,2-dichloroethane. The hexafluoro-chlorobutenes obtained in this way can be converted into hexafluorobutane, a CFC substitute, by hydrogenation.
摘要:
The invention relates to new 3-thiocarbarnoylpyrazole derivatives of the formula (I) in which Ar represents in each case optionally substituted phenyl or pyridyl, R1 represents H2N—CS— and R2 and R3 are as defined in the description, to a plurality of processes for their preparation and to their use as pesticides.
摘要:
A process for preparing perfluoroalkoxy(alkylthio)benzenes from perfluorochloroalkoxy(alkylthio)-benzenes by reaction with hydrogen fluoride in the gas phase and in the presence of a catalyst.
摘要:
Polychloro-fluoro-cyclopentenes can be prepared by catalytic reaction of hexachlorocyclopentadiene with hydrogen fluoride in the gas phase with the addition of chlorine.
摘要:
New fluorinated bisaryloxy-substituted alkenes are prepared by reaction of substituted phenols with perhaloalkenes and can be used as electrical insulating agents.