System of chromium catalyst and yttrium catalyst, olefin polymer

Details System of chromium catalyst and yttrium catalyst, olefin polymer System of chromium catalyst and yttrium catalyst, olefin polymer

1993-11-17

1995-03-21

Nagumo, Mark

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

526 97, 526 96, 526114, 526348, 526905, 525270, 525245, 525247, 525902, 502113, 502112, 502154, C08F 478, C08F 1002, C08F 1014

Patent

active

053996224

ABSTRACT:
A catalyst system for the polymerization of alpha-olefins comprising a chromium-containing catalyst and an yttrium-containing catalyst wherein the yttrium-containing catalyst is represented by the formula (Cp.sub.2 YX.sub.x).sub.y.M.sub.z L.sub.n, wherein Cp is cyclopentadienyl or cyclopentadienyl substituted with alkyl or alkyl silyl radical or radicals, X is a halogen, M is an alkali metal, L is a suitable electron donor ligand, x is 1 or 2, y is 1 or 2, z is 0 or 1, and n is a number corresponding to the value needed to form a stable complex, with the proviso that when y is 2, z and n are 0 is provided. Also disclosed is a polymerization process employing such a catalyst system, and novel olefin polymers. Polymers thus produced exhibit high bulk density and a broad molecular weight distribution.

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Journal of Organometallic Chemistry, 322 (1987) 321-329, "Synthesis and Coordination Chemistry of Permethylyttrocene Chloride", Klaas H. den Haan and Jan H. Tueben.
Organometallics 1985, 4, 554-559, W. J. Evans et al., "Synthesis and X-ray Crystallographic Characterization of an Asymmetric Organoyttrium Halide Dimer".

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