| 摘要 |
A catalyst useful for the production of olefinic polymers which comprises a compound (A) of the formula Me1(OR1)pR2qX14-pq ...... I where R1 and R2 each are C1-C24 hydrocarbon moieties, X1 is a halogen atom, Me1 is titanium, zirconium or hafnium, p is 0 a metal hydride compound (B) consisting at least of one of the compounds of the formulae: (Ba) Me2HaR33-a ..... II (Bb) Me3¢Me2HbR4(OR5)4-b-c!z ..... III and (Bc) <IMG> ..... IV wherein R3, R4, R5 and R6 each are C1-C24 hydrocarbon moieties, Me2 is an element of Group 13 in the Periodic Table, Me3 is an element of Group 1, 2 or 12 in the Periodic Table, Z is a valence of Me3, a, b, c and d are 1 1 1 an organocyclic compound (C) having two or more conjugated double-bonds; and a borate and/or borane (D). The invention further contemplates the incroporation into the above composition of a modified organoaluminum compound (E) having Al-O-Al bonds to provide enhanced catalytic performance.
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