| 摘要 |
The invention relates to a catalyst system comprising
I. a solid reaction product obtained by reaction of:
(a) a hydrocarbon solution comprising
(1) an organic oxygen containing magnesium compound or a halogen containing magnesium compound
(2) an organic oxygen containing titanium compound and
(3) at least one compound containing zirconium and/or hafnium
(b) a mixture comprising a metal compound having the formula MeR n X 3-n wherein X is a halogenide, Me is a metal of Group III of Mendeleev's Periodic System of Chemical Elements, R is a hydrocarbon radical containing 1 - 10 carbon atoms and 0 ‰¤ n ‰¤ 3 and a silicon compound of formula R m SiCl 4-m wherein 0 ‰¤ m ‰¤ 2 and R is a hydrocarbon radical containing 1 - 10 carbon atoms wherein the molar ratio of metal from (b): titanium from (a) is lower than 1:1 and
II. an organo aluminum compound having the formula AlR 3 in which R is a hydrocarbon radical containing 1 - 10 carbon atoms. |
