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CN105143275A 用于生产耐低温聚丙烯组合物的多阶段法 有权

用于生产耐低温聚丙烯组合物的多阶段法
摘要：
一种在聚合催化剂存在下聚合丙烯的方法，其通过在三个聚合阶段中将丙烯与共聚单体共聚合来进行，所述共聚单体选自乙烯及C4-C10α-烯烃。在第一聚合阶段中生产的聚合物具有最大的熔体流动速率和最低的共聚单体含量。在最后的聚合阶段中生产的聚合物具有最低的熔体流动速率和最高的共聚单体含量。通过所述方法生产的聚合物组合物具有良好的机械性能并可用于制备管材。所述方法具有良好的生产率。
摘要（英）：

A process for polymerizing propylene in the presence of a polymerization catalyst by copolymerizing propylene with a comonomer selected from the group of ethylene and C4- C10 alpha-olefins in three polymerization stages. The polymer produced in the first polymerization stage has the highest melt flow rate and the lowest content of comonomer. The polymer produced in the last polymerization stage has the lowest melt flow rate and the highest content of comonomer. The polymer composition produced by the process has good mechanical properties and can be used for making pipes. The process has a good productivity.

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