in a process for producing an ethylene copolymer by copolymerizing ethylene with an a-olefin or copolymerizing ethylene with an a-olefin and a non-conjugated diene in the presence of a Ziegler-Natta catalyst comprising an organoaluminum compound and a compound of a transistion metal belonging to Group IV or V of the periodic table or comprising these and a catalyst-activating agent, in a polymerization medium which is substantially incapable of dissolving the resulting ethylene copolymer, and thereby producing a rubberlike ehtylene copolymer in particulate form, the improvement which comprises adding to the polymerization reaction system, as adhesion-preventing agent, an alkali metal salt of a sulfocarboxylic acid dialkyl ester or a composition comprising (a) a polysulfone copolymer of sulfur dioxide and an olefin compound, (b) a polyamine comprising a reaction product of epichlorohydrin with an N-aliphatic hydrocarbylalkylene-diamine, and (c) an oil-soluble sulfonic acid.
在一种生产
乙烯共聚物的工艺中,
乙烯与a-烯烃或
乙烯与a-烯烃和非共轭二烯在齐格勒-纳塔催化剂存在下共聚,齐格勒-纳塔催化剂包括一种
有机铝化合物和一种属于元素周期表第Ⅳ或Ⅴ族或包括这些化合物和一种催化剂活化剂的反式
金属化合物,聚合介质基本上不能溶解生成的
乙烯共聚物、该改进包括在聚合反应体系中加入
硫代
羧酸二烷基酯的碱
金属盐作为附着防止剂,或加入由以下物质组成的组合物:(a)
二氧化硫和烯烃化合物的聚砜共聚物;(b) 由
环氧氯丙烷与 N-脂肪族烃基亚烷基二胺的反应产物组成的
多胺;(c) 油溶性
磺酸。