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    • 3. 发明专利
    • DE818121C
    • 1951-10-22
    • DEN0000598
    • 1950-03-10
    • BATAAFSCHE PETROLEUM
    • HACKMANN JOHANNES THOMAS
    • C08C19/20
    • Unsaturated polymeric materials having molecular weights of at least 5000 are reacted with sulphur dioxide in the presence of a chlorine oxide, e.g. chlorine peroxide and chlorine heptoxide. Examples of polymers include those of butadiene, methyl butadiene and chloroprene, copolymers of these with each other and with isobutylene, styrene and vinyl chloride, and polymers of acetylene. Low molecular weight unsaturated compounds such as butadiene, 1 : 5 - hexadiene and diallyl phthalate may also take part in the reaction. The chlorine oxide is preferably added in the form of a solution in a halogenated hydrocarbon to a solution of the polymer in a solvent which is miscible with the halogenated hydrocarbon. The mixture may be poured or extruded into a solution of sulphur dioxide, forming by the latter method threads, fibres and tapes. The polymeric materials may be treated with a mild oxidizing agent such as hydrogen peroxide or hypochlorous acid before adding the chlorine oxide.
    • 10. 发明专利
    • DE813893C
    • 1951-09-17
    • DEN0000030
    • 1949-10-11
    • BATAAFSCHE PETROLEUM
    • HACKMANN JOHANNES THOMASRUMSCHEIDT GOTTFRIED ERNST
    • C08C19/20
    • Polydienes are reacted with sulphur dioxide in the presence of a hydroperoxide derived from a hydrocarbon containing at least one aliphatic chain containing not more than three carbon atoms and one or more aromatic nuclei. The term "polydienes" signifies polymers, having a number of unsaturated carbon-to-carbon bonds and a molecular weight above 5000, derived from dienes such as butadiene, pentadiene, isoprene and chloroprene, alone or with vinyl compounds, e.g. styrene and acrylonitrile, and includes natural rubber, guttapercha and balata. Specified hydroperoxides are ethylbenzene-, diethylbenzene-, xylene-, triphenylmethyl- and cumene hydroperoxides. The reaction products may be obtained in the form of threads, fibres, ribbons, films and foils by extruding a solution of the polydiene and hydroperoxide into a solution of sulphur dioxide. The polydienes may be mixed with low molecular unsaturated compounds, e.g. alkadienes and allyl compounds, as described in Specification 659,083. The examples describe the reaction of plasticized natural rubber, dissolved in a mixture of benzene and toluene, with sulphur dioxide dissolved in ethanol and water, at a temperature of -5 DEG C. The coagulated threads, after washing with ethanol and drying, have a sulphur content of 21 per cent.