申请人:Mitsubishi Chemical Corporation
公开号:EP0579510A2
公开(公告)日:1994-01-19
A process for preparing a propylene polymer which comprises polymerizing propylene, and optionally a minor amount of another α-olefin, in the presence of a catalyst which comprises a mixture of:
(i) a propylene polymer-containing solid titanium trichloride containing 0.1 to 500 g of propylene polymer per gram of titanium trichloride, and
(ii) an organic aluminium compound (organic aluminium compound A);
wherein said propylene polymer-containing solid titanium trichloride is obtainable by contacting propylene with
(i) a solid titanium trichloride catalytic complex containing aluminium in an atomic ratio of 0.15:1 or less relative to the titanium and a complexing agent, in the presence of
(ii) an organic aluminium compound (organic aluminium compound B), and
(iii) an aromatic carboxylate ester; and a propylene polymer composition which consists essentially of:
(i) 100 parts by weight of a propylene polymer in which the weight percent of the polymer which dissolves in o-dichlorobenzene at temperatures between 120 and 135°C is at least the value calculated from equation (I) when the melt flow rate (MFR) of the polymer is equal to or less than 100 g/10 min., or calculated from equation (II) when the MFR of the polymer is more than 100 g/10 min.:[40 - 15 log(MFR)] x 100[50 - 20 log(MFR)] x 100
when the amount of the polymer dissolved in o-dichlorobenzene is measured at each temperature while continuously or stepwise raising the temperature of the o-dichlorobenzene; and
(ii) 0.001 to 3 parts by weight of a nucleating agent.
一种制备丙烯聚合物的工艺,包括在催化剂存在下聚合丙烯和少量另一种α-烯烃,催化剂由以下物质的混合物组成:
(i) 含丙烯聚合物的固体三氯化钛,每克三氯化钛含 0.1 至 500 克丙烯聚合物,和
(ii) 有机铝化合物(有机铝化合物 A);
其中所述含丙烯聚合物的固体三氯化钛可通过丙烯与以下物质接触获得
(i) 固体三氯化钛催化络合物,该络合物含有相对于钛原子比为 0.15:1 或更小的铝和一种络合剂,并存在以下物质
(ii) 有机铝化合物(有机铝化合物 B),和
(iii) 一种芳香族羧酸酯;以及一种丙烯聚合物组合物,其主要成分包括
(i) 100 重量份的丙烯聚合物,其中在温度介于 120 和 135°C 之间的邻二氯苯中溶解的聚合物的重量百分比至少为等式 (I) 中计算的值,当聚合物的熔体流动速率 (MFR) 等于或小于 100 克/10 分钟时,或当聚合物的熔体流动速率大于 100 克/10 分钟时,根据等式 (II) 计算的值:[40 - 15 log(MFR)] x 100[50 - 20 log(MFR)] x 100
当连续或逐步提高邻二氯苯的温度时,在每个温度下测量溶解在邻二氯苯中的聚合物量;以及
(ii) 0.001 至 3 份重量的成核剂。