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Stereospecific olefin polymerization catalysts

Patent ·
OSTI ID:871326
 [1];  [1]
  1. Pasadena, CA
+ Show Author Affiliations

A metallocene catalyst system for the polymerization of .alpha.-olefins to yield stereospecific polymers including syndiotactic, and isotactic polymers. The catalyst system includes a metal and a ligand of the formula ##STR1## wherein: R.sup.1, R.sup.2, and R.sup.3 are independently selected from the group consisting of hydrogen, C.sub.1 to C.sub.10 alkyl, 5 to 7 membered cycloalkyl, which in turn may have from 1 to 3 C.sub.1 to C.sub.10 alkyls as a substituent, C.sub.6 to C.sub.15 aryl or arylalkyl in which two adjacent radicals may together stand for cyclic groups having 4 to 15 carbon atoms which in turn may be substituted, or Si(R.sup.8).sub.3 where R.sup.8 is selected from the group consisting of C.sub.1 to C.sub.10 alkyl, C.sub.6 to C.sub.15 aryl or C.sub.3 to C.sub.10 cycloalkyl; R.sup.4 and R.sup.6 are substituents both having van der Waals radii larger than the van der Waals radii of groups R.sup.1 and R.sup.3 ; R.sup.5 is a substituent having a van der Waals radius less than about the van der Waals radius of a methyl group; E.sup.1, E.sup.2 are independently selected from the group consisting of Si(R.sup.9).sub.2, Si(R.sup.9).sub.2 --Si(R.sup.9).sub.2, Ge(R.sup.9).sub.2, Sn(R.sup.9).sub.2, C(R.sup.9).sub.2, C(R.sup.9).sub.2 --C(R.sup.9).sub.2, where R.sup.9 is C.sub.1 to C.sub.10 alkyl, C.sub.6 to C.sub.15 aryl or C.sub.3 to C.sub.10 cycloalkyl; and the ligand may have C.sub.S or C.sub.1 -symmetry. Preferred metals are selected from the group consisting of group III, group IV, group V or lanthanide group elements. The catalysts are used to prepare stereoregular polymers including polypropylene from .alpha.-olefin monomers.

Research Organization:
California Institute of Technology (Pasadena, CA)
DOE Contract Number:
FG03-85ER13431
Assignee:
California Institute of Technology (Pasadena, CA)
Patent Number(s):
US 5708101
OSTI ID:
871326
Country of Publication:
United States
Language:
English

References (21)

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Limiting the relative orientation of bridged cyclopentadienyl anions. Mono- and dianions derived from 4,4,8,8-tetramethyltetrahydro-4,8-disila-s-indacenes journal June 1991
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6,6-Dimethyl-6-Silafulvene. Generation and Trapping Reactions journal September 1980
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ansa-Metallocene derivatives. 27. Chiral zirconocene complexes with two dimethylsilylene bridges journal May 1993
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