Metallocene and process for producing polyolefin using the same

Details Metallocene and process for producing polyolefin using the same Metallocene and process for producing polyolefin using the same

1994-03-15

1994-09-20

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

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

Patent

active

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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patent: 5132262 (1992-07-01), Rieger et al.
Ewen, J. A., et al., "Syndiospecific Propylene Polymerizations with Group 4 Metallocenes", J. Am. Chem. Soc., vol. 110, pp. 6255-6256, 1988.
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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.
Ewen, J. A., "Mechanisms of Stereochemical Control in Propylene Polymerizations with Soluble Group 4B Metallocene/Methylalumoxane Catalysts", J. Am. Chem. Soc., vol. 106, pp. 6355-6364, 1984.

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