Process for the preparation of syndiotactic polyolefins having a

Details Process for the preparation of syndiotactic polyolefins having a Process for the preparation of syndiotactic polyolefins having a

1995-06-07

1996-12-24

Wu, David W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

556 52, 556 54, 502152, 526118, 526119, C07F 1700

Patent

active

055875017

ABSTRACT:
Syndiotactic polyolefins having a molecular weight distribution M.sub.w /M.sub.n of >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 2 metallocenes of the formula ##STR1## which are stereorigid and whose moiety formed by Zr and the substituents R.sup.1 -R.sup.4 has C.sub.s symmetry or slightly distorted C.sub.s symmetry.

REFERENCES:
patent: 4849487 (1989-07-01), Kaminsky et al.
patent: 4892851 (1990-01-01), Ewen
patent: 4935474 (1990-06-01), Ewen et al.
patent: 4975403 (1990-12-01), Ewen
Ewen et al., "Syndiospecific Propylene Polymerizations with Group 4 Metallocenes", J. Am. Chem. Soc. 1988, 110, pp. 6255-6256.
Giannetti et al., "Homogeneous Ziegler-Natta Catalysis. II. Ethylene Polymerization by IVB Transition Metal Complexes/ Methyl Aluminoxane Catalyst Systems", Journal of Polymer Science, vol. 23, pp. 2117-2133 (1985).
"Catalytic Olefin Polymerization", Studies in Surface Science and Catalysis, vol. 56, pp. 507-515 (1989).

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