Metallocene and process for producing polyolefin using the same

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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526160, 5263482, 5263484, 5263486, 526351, 502152, 556 12, C08F 464

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053490320

ABSTRACT:
A metallocene having an asymmetric ligand which is represented by the formula below and its enantiomer: ##STR1## and a process for producing a polyolefin using the same as a catalyst component. The metallocene and its enantiomer are particularly effective in the production of highly stereospecific polyolefins.

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Ewen, J. A., et al., "Syndiospecific Propylene Polymerizations with Group 4 Metallocenes", J. Am. Chem. Soc., vol. 110, pp. 6255-6256, 1988.
Song, X., et al., "Stereospecific Polymerization of Olefins with ansa-Metallocene Derivatives/Methylaluminoxane Catalyst Systems," Polymer Preprints, Japan, vol. 40, No. 2, p. 265, 1991.
Collins, S., et al., "Variation of Poly(propylene) Microtacticity by Catalyst Selection", Organometallics, vol. 10, pp. 2061-2068, 1991.
Mise, Takaya et al., "Excellent Stereoregular Isotactic Polymerizations of Propylene with C.sub.2 -Symmetric Silylene-Bridged Metallocene Catalysts", Chemistry Letters, pp. 1853-1856, 1989.
Ewen, J. A., et al., "Crystal Structures and Stereospecific Propylene Polymerizations with Chiral Hafnium Metallocene Catalysts", J. Am. Chem. Soc., vol. 109, pp. 6544-6545, 1987.
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