Process for the preparation of polyolefins having a broad molecu

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

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526118, 526127, 526153, 526160, 526352, 502117, 502155, C08F 464

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053508173

ABSTRACT:
Polyolefins having a molecular weight distribution M.sub.w /M.sub.n of .gtoreq.3 and which may be monomodal, bimodal or multimodal are obtained by polymerization or copolymerization of olefins of the formula RCH.dbd.CHR, in which a catalyst system comprising an aluminoxane and a transition-metal component (metallocene) is used, the transition-metal component comprising at least one zirconocene of the formula I ##STR1## and at least one zirconocene of the formula Ia or alternatively at least 2 zirconocenes of the formula I.

REFERENCES:
patent: 4849487 (1989-07-01), Kaminsky et al.
patent: 4975403 (1990-12-01), Ewen
patent: 5001205 (1991-03-01), Hoel
Giannetti, E., et al., J. of Polymer Science: Polymer Chem. Ed. 23:2117-2134 (1985).

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