| abstract |
The present invention relates to procatalysts comprising, as internal electron donors, compounds represented by formula A, Wherein: R 81 , R 82 , R 83 , R 84 , R 85 and R 86 are the same or different and are independently selected from hydrogen, linear, branched or cyclic alkyl, and substituted and unsubstituted aromatic Hydrocarbyl, it has 1 to 20 carbon atoms; R 87 is hydrogen or straight chain, branched chain or cyclic hydrocarbon group, it is selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl and one or more combinations thereof, preferably having 1 to 20 carbon atoms; and each R group is independently a linear, branched or cyclic hydrocarbon group selected from the group consisting of alkyl, alkenyl, aryl, Aralkyl or alkylaryl, and one or more combinations thereof, preferably have 1 to 30 carbon atoms; N is a nitrogen atom; O is an oxygen atom; and C is a carbon atom. The present invention also relates to a process for preparing said polymerization procatalyst and a polymerization catalyst system comprising said procatalyst, cocatalyst and optionally an external electron donor. Furthermore, the present invention relates to the use of polyolefins obtainable by the process according to the invention and compounds of formula A as internal electron donors in procatalysts for the polymerization of olefins. |