| abstract |
The invention relates to a procatalyst comprising a compound represented by formula A as an internal electron donor, wherein in said formula R81, R82, R83, R84, R85 and R86 are the same or different and are independently selected from the group consisting of hydrogen or linear, branched and a cyclic hydrocarbon group selected from alkyl, alkenyl, aryl, aralkyl or alkylaryl groups and one or more combinations thereof, preferably having from 1 to 20 carbon atoms; R87 is hydrogen or a linear, branched or cyclic hydrocarbon group selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups and one or more combinations thereof, preferably having from 1 to 20 carbon atoms; and each R is independently a group selected from alkyl having from 1 to 6 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 method for preparing a procatalyst for polymerization and a catalytic system for polymerization comprising said procatalyst, a cocatalyst and, optionally, an external electron donor. In addition, the present invention relates to the use of a compound of formula A as an internal electron donor in catalysts for the polymerization of olefins. |