| 摘要 |
A catalyst containing the combination which comprises: (a) an aluminoxane, a compound of the formula RxNH4-x, BR'4, RxPH4-x, BR'4, R3CBR'4 or BR'3, or a mixture thereof wherein X is an integer from 1 to 4 and the radicals R are identical or different and are a C1-C10-alkyl or a C6-C18-aryl or 2 radicals R together with the atom joining them form a ring, and the radicals R' are identical or different and are a C6-C18-aryl which optionally are substituted by alkyl, haloalkyl or fluorine, and (b) a metallocene of the formula VI in which M1 is titanium, zirconium, hafnium, vanadium, niobium or tantalum, R1 is (C3-C20)alkyl, (C6-C14)aryl, (C4-C10)alkoxy, (C2-C10)alkenyl, (C7-C20)arylalkyl, (C7-C20)alkylaryl, (C6-C10)aryloxy, (C1-C10)fluoroalkyl, (C6-C10)halogenoaryl, (C2-C10)alkynyl; a radical -SiR63, in which R6 is (C1-C10)alkyl; a halogen atom; or an aromatic radical having 5 or 6 ring members in the ring, at lease one of which is a heteroatom, R2, R3 and R4 are identical or different and are hydrogen; (C1-C20)alkyl, (C6-C14)aryl, (C1-C10)alkoxy, (C2-C10)alkenyl, (C7-C20)arylalkyl, (C7-C20)alkylaryl, (C6-C10)aryloxy, (C1-C10)fluoroalkyl, (C6-C10)halogenoaryl, (C2-C10)alkynyl; a radical -SiR63, in which R6 is (C1-C10)alkyl, a halogen atom, or a heteroaromatic radical which has 5 or 6 ring members and can contain one or more heteroatoms, or adjacent radicals R1-R4; with the atoms joining them, form one or more rings, R5 is hydrogen, R7 is a radical in which M2 is carbon, silicon, germanium or tin.
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