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Title: 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 (CalTech), Pasadena, CA (United States)
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)

Untersuchungen von polymerisations- und metathesereaktionen, XXII. Darstellung und katalytische reaktionen von substituierten titanocendichloriden journal March 1995
Synthesis and Structure of the First[22]Metallocenophanes journal August 1994
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
Synthesis and Structure of a C2-Symmetric, Doubly Bridged ansa-Titanocene Complex journal October 1994
ansa-Metallocene derivatives XXXII. Zirconocene complexes with a spirosilane bridge: syntheses, crystal structures and properties as olefin polymerization catalysts journal April 1996
ansa-Metallocene derivatives. 27. Chiral zirconocene complexes with two dimethylsilylene bridges journal May 1993
6,6-Dimethyl-6-Silafulvene. Generation and Trapping Reactions journal September 1980
Untersuchungen von polymerisations- und metathesereaktionen, XXII Einfach und zweifach dimethylsilylen-verbrückte Metallocendichloride des Ti, Zr und Hf in der Ethen- und Propen-Polymerisation journal August 1996
Double-Dimethylsilyl-Bridged Dicyclopentadienyl Group 4 Metal Complexes. X-ray Molecular Structures of M[(Me2Si)2(.eta.5-C5H3)2]Cl2 (M = Ti, Zr) and (TiCl3)2{.mu.-[(Me2Si)2(.eta.5-C5H3)2]} journal May 1994
Substituted Silastannatetrahydro- s -indacenes as Cyclopentadienyl Transfer Agents in the Synthesis of Silanediyl-Bridged Zirconocene Complexes 1 journal January 1996
ansa-Metallocene Derivatives. 30. Syntheses and Structures of Titanocene, Zirconocene, and Vanadocene Dichloride Complexes with Two Ethanediyl Bridges journal October 1994
Syndiospecific propylene polymerizations with Group IVB metallocenes journal August 1988
Synthesis and Reaction Behavior of the Novel Mono(.sigma.-alkynyl)titanocene Chloride [(.eta.5-C5H2SiMe3)SiMe2]2Ti(Cl)(CCSiMe3) journal April 1995
Dicyclopentadienyl titanium and zirconium complexes with the double bridged bis(dimethylsilanodiyl) dicyclopentadienyl [(Me2Si)2(η5-C5H3)2]2− ligand: X-ray molecular structure of [Ti{(SiMe2)2(η5-C5H3)2}Me2]1 journal December 1996
Stereospecific Olefin Polymerization with Chiral Metallocene Catalysts journal June 1995
Binuclear metal complexes of a doubly bridged cyclopentadienyl ligand journal March 1992
Doubly Bridged ansa -Zirconocenes Based on the Norbornadiene Skeleton: A Quantum Mechanical and Molecular Mechanics Study journal January 1996
Synthesis of New Silyl-Bridged Bis(cyclopentadienyl) Ligands and Complexes journal January 1996
Silenes and silenoids. 8. Silenoid precursors to apparent silafulvene dimers in the metalation of cyclopentadienyldimethylchlorosilane journal August 1985
β-Hydrogen-Containing Zirconium Alkyls with the Doubly-Bridged Bis(dimethylsilanediyl)dicyclopentadienyl Ligand. X-ray Molecular Structures of [Zr{(SiMe 2 ) 2 (η 5 -C 5 H 3 ) 2 }ClEt] and [Zr{(SiMe 2 ) 2 (η 5 -C 5 H 3 ) 2 }Et] 2 (μ-CH 2 CH 2 ) journal April 1997
Carbon-Hydrogen Bond Activation by Peralkylhafnocene and Peralkylscandocene Derivatives text January 1988

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Related Subjects

stereospecific
olefin
polymerization
catalysts
metallocene
catalyst
alpha
-olefins
yield
polymers
including
syndiotactic
isotactic
metal
ligand
formula
str1
independently
selected
consisting
hydrogen
10
alkyl
membered
cycloalkyl
alkyls
substituent
15
aryl
arylalkyl
adjacent
radicals
stand
cyclic
carbon
atoms
substituted
substituents
van
waals
radii
larger
radius
methyl
-si
-c
-symmetry
preferred
metals
iii
lanthanide
elements
prepare
stereoregular
polypropylene
-olefin
monomers
preferred metal
polymerization catalysts
olefin polymerization
independently selected
carbon atoms
polymers including
polymerization catalyst
carbon atom
metallocene catalyst
olefin polymer
olefin monomers
olefin monomer
specific polymer
isotactic polymers
/526/502/999/