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公开(公告)号：US4153774A
公开(公告)日：1979-05-08
申请号：US850398
申请日：1977-11-10
CPC分类号： C08F6/26 , Y10S526/921
摘要： A process for the high pressure polymerization of ethylene at elevated temperatures in a polymerization zone followed by transfer of the reaction mixture, through a cooling zone, into the separation zone. In this process, the pressure at the cooling zone outlet is periodically reduced briefly, at recurring intervals, these brief pressure reductions being independent of the pressure reductions in the polymerization zone. Using this process, the conversion in the polymerization unit can be increased and a more homogeneous ethylene polymer can be obtained.
摘要翻译： 在聚合区域中在高温下高压聚合乙烯的方法，然后将反应混合物通过冷却区转移到分离区中。 在此过程中，冷却区出口处的压力周期性地以重复的间隔周期性地减小，这些简单的压力降低与聚合区域中的压力降低无关。 使用该方法可以提高聚合单元中的转化率，并可获得更均匀的乙烯聚合物。
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公开(公告)号：US4177340A
公开(公告)日：1979-12-04
申请号：US855896
申请日：1977-11-30
IPC分类号： C08F2/00 , C08F2/02 , C08F2/34 , C08F2/38 , C08F10/00 , C08F110/02 , C08F210/02
CPC分类号： C08F110/02
摘要： A process for the manufacture of ethylene polymers by polymerizing ethylene under high pressures and at high temperatures in the presence of from 0.01 to 0.5 percent by weight of an alkyl ester (alkyl being of 1 to 8 carbon atoms) of an alkenemonocarboxylic acid of 3 or 4 carbon atoms. n-Butyl acrylate is a particularly suitable polymerization activator. Although the start temperature of the ethylene polymerization is relatively low, there is no difference in mechanical and optical properties of a blown film manufactured from the resulting ethylene polymer and of a blown film of pure polyethylene.
摘要翻译： 在高压和高温下，在0.01至0.5重量％的烷基酯（烷基为1至8个碳原子）存在下，通过在乙烯聚合乙烯聚合乙烯的方法 4个碳原子。 丙烯酸正丁酯是特别合适的聚合活化剂。 尽管乙烯聚合的起始温度相对较低，但由所得乙烯聚合物和纯聚乙烯吹塑薄膜制成的吹塑薄膜的机械和光学性能没有差别。
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