| 摘要 |
1,130,316. Emulsion polymerization using redox catalyst. B. E. BARTRUM (DOW CHEMICAL CO). 21 Feb., 1966, No. 7535/66. Heading C3P. Monoethylenically unsaturated substantially water-immiscible polymerizable monomeric compounds are polymerized in aqueous emulsion utilizing a redox polymerization catalyst, the catalyst being formed in situ by first dissolving sulphur dioxide in the monomeric compound or in a mixture of the monomeric compounds to be polymerized and subsequently adding the resulting solution to an aqueous medium containing a peroxygen compound under polymerizing conditions, thus providing a sulphur dioxide-peroxygen compound system as redox catalyst, said solution being added at a rate such that the rate of supply of the monomers is substantially equal to the rate of polymerization so that the ratio of the amount of monomers to the amount of sulphur dioxide is substantially constant throughout the process. In the examples ethyl acrylate, vinylidene chloride, vinyl chloride, acrylonitrile, diethyl maleate and methyl acrylate are polymerized in the presence of water, potassium persulphate, sodium dodecyl benzene sulphonate, ferric chloride, sodium salt of sulphonated white oil, ammonium perdisulphate, sulphuric acid, sodium salt of isopropyl naphthalene sulphonic acid, ammonium persulphate and potassium oleate.
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