An aliphatic hydrocarbon soluble mixed aluminum hydrocarbyl-Lewis base co-catalyst composition comprising (i) at least two different classes of aluminum hydrocarbyls the first being an aluminum hydrocarbyl halide, the second being an aluminum hydrocarbyl hydride and/or aluminum trialkyl and (ii) at least one Lewis base represented by the formula:
wherein each Y can be -OR', -NR2 and R' with the proviso that at least two be -OR' or -NR2, Z is an alkylene radical forming a 5 or 6 membered ring with the carbonyldioxy group or Z is alkyl substituted alkylene group wherein the alkyl radical can have from 1 to 8 carbon atoms, R is an aryl, allyl or alkyl group having from 1 to 20 carbon atoms and R' is an alkyl, cycloalkyl, aryl or aralkyl radical having from 1 to 20 carbon atoms.
The co-catalyst is employed with a titanium halide catalyst for the polymerization of olefins to obtain a advantageous balance of catalytic activity and polymer product stereoregularity.
一种脂族烃溶性混合烃基铝-路易斯碱助催化剂组合物,包括(i)至少两类不同的烃基铝,第一类是烃基卤化铝,第二类是烃基
氢化铝和/或三烷基铝,以及(ii)至少一种由式表示的路易斯碱:
其中每个 Y 可以是-OR'、-NR2 和 R',但至少有两个是-OR'或-NR2,Z 是与羰基二氧基形成 5 或 6 成员环的亚烷基,或者 Z 是烷基取代的亚烷基,其中烷基可以具有 1 至 8 个碳原子,R 是具有 1 至 20 个碳原子的芳基、烯丙基或烷基,R'是具有 1 至 20 个碳原子的烷基、环烷基、芳基或芳烷基。
该助催化剂与卤化
钛催化剂一起用于烯烃的聚合,可在催化活性和聚合物产品的立体规整性之间取得有利的平衡。