CYCLIC ORGANOSILICON COMPOUNDS AS ELECTRON DONORS IN ZEIGLER-NATTA CATALYST SYSTEMS FOR PRODUCING PROPYLENE POLYMER HAVING HIGH MELT-FLOWABILITY
申请人:Zhang Lei
公开号:US20130109820A1
公开(公告)日:2013-05-02
Cyclic organosilicon compounds having a structure represented by the general formula
and a method for using thereof as a component of catalysts for producing propylene polymer having a very high melt-flowability are disclosed. The cyclic organosilicon compounds are employed as external electron donors in Ziegler-Natta catalyst systems to dramatically improve the hydrogen response, and therefore the catalyst systems can be used to prepare polymer having high melt-flowability and high isotacticity at high yield.