| 摘要 |
1474679 Production of molten acrylonitrile polymers JAPAN EXLAN CO Ltd 12 Aug 1975 [13 Aug 1974] 33615/75 Heading C3P Acrylonitrile or a monomer mixture containing a major amount of acrylonitrile is polymerized at above 120‹ C. under autogenous pressure or under a pressure above the vapour pressure generated in the polymerization system under the polymerization conditions, and in a system containing water present in amount of 3-50 wt. per cent (based on the total monomer plus water weight), to produce a molten polymer. In Examples 1-6 and 8-10 acrylonitrile is polymerized with various comonomers in sealed tubes, together with catalyst system and water. In Example 7, continuous polymerization of acrylonitrile and methyl acrylate is carried out with continuous addition of water, in a tubular vessel having at the upstream end, a feed tube of 3 mm. diameter, behind which there is a plunger pump. At the downstream end is an orifice which may be closed, of 0À7 mm. diameter. The pump feeds in the reaction mixture and polymerization commences, and when the required pressure is reached, the orifice is opened and the molten polymer continuously extruded out. |
