| abstract |
The present invention relates to a catalyst component for producing a high molecular weight copolymer having the general formula I, in which M 1 is a metal from group IVb, Vb or VIb of the periodic table, R 1 and R 2 are identical or different and are a hydrogen atom, a C 1 -C 10 alkyl, a C 7 -C 40 arylalkyl, a C 7 -C 40 alkylaryl, a C 8 -C 40 - Arylalkenyl, an OH group or a halogen atom, the radicals R 3 are identical or different and a halogen atom, a C 1 -C 10 alkyl group, a C 1 -C 10 alkenyl group, a C 6 -C 10 aryl group , R 4 to R 12 are the same or different and have the meanings given for R 3 , or adjacent radicals R 4 to R 12 form one or more aromatic or aliphatic rings with the atoms connecting them, or the radicals R 5 and R 8 or R 12 forms an aromatic or aliphatic ring with the atoms connecting them, R 4 to R 12 are also hydrogen, at least one radical R 8 , R 9 , R 10 , R 11 or R 12 is different from hydrogen, if not one of the radicals R 5 , R 6 and R 7 are different from hydrogen. The present invention further relates to a catalyst system for producing a high molecular weight copolymer which contains at least one catalyst component and at least one cocatalyst, preferably an aluminoxane. Finally, the present invention relates to copolymers containing 99.5 to 30% by weight of propylene units, based on the total polymer, and 0.5 to 70% by weight of at least one comonomer, based on the total polymer, the comonomers being units which are themselves derived from ethylene or olefins having at least 4 carbon atoms of the formula R a -CH = CH-R b , where R a and R b are identical or different and denote a hydrogen atom or an alkyl radical. |