Catalyst system for enhanced stereo-specificity of olefin polymerization and method for producing olefin polymer
申请人:Formosa Plastics Corporation, USA
公开号:US10822438B2
公开(公告)日:2020-11-03
Disclosed are a catalyst component for olefin polymerization comprising titanium, magnesium, a halogen, internal donors, in combination with a silane and oxalic acid diamides of the following formula:
An olefin polymerization catalyst system consisting of the solid catalyst component, an organoaluminum compound, and an optional external electron donor compound is also disclosed. Employment of both oxalic acid diamides and silane component in the presence of internal electron donors as an elements of solid Ziegler-Natta type catalyst composition enhances stereo-specificity while maintaining excellent catalyst activity and hydrogen response, in which the modified catalyst composition produces polypropylene with good productivity and higher stereo-specificity than catalyst composition without such modification.
本发明公开了一种用于烯烃聚合的催化剂组分,该组分由钛、镁、卤素、内部供体与硅烷和下式草酸二酰胺组成:
还公开了一种烯烃聚合催化剂体系,由固体催化剂组分、有机铝化合物和任选的外部电子供体化合物组成。在内部电子供体存在的情况下,同时使用草酸二酰胺和硅烷组分作为固体齐格勒-纳塔型催化剂组合物的元素,可提高立体特异性,同时保持优异的催化剂活性和氢响应,与未进行此类改性的催化剂组合物相比,改性催化剂组合物生产的聚丙烯具有良好的生产率和更高的立体特异性。