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Homogeneous catalysts for stereoregular olefin polymerization

Patent ·
OSTI ID:870095
; ;

The synthesis, and use as precatalysts of chiral organozirconium complexes for olefin polymerization are disclosed, having the structure (C.sub.5 R'.sub.4-x R*.sub.x) A (C.sub.5 R".sub.4-y R"'.sub.y) M Q.sub.p, where x and y represent the number of unsubstituted locations on the cyclopentadienyl ring; R', R", R"', and R* represent substituted and unsubstituted alkyl groups having 1-30 carbon atoms and R* is a chiral ligand; A is a fragment containing a Group 13, 14, 15, or 16 element of the Periodic Table; M is a Group 3, 4, or 5 metal of the Periodic Table; and Q is a hydrocarbyl radical, or halogen radical, with 3.ltoreq.p.ltoreq.o. Related complexes may be prepared by alkylation of the corresponding dichorides. In the presence of methylalumoxane or triarylborane cocatalysts, these complexes form "cation-like" species which are highly active for olefin polymerization. In combination with a Lewis acid cocatalyst, propylene or other .alpha.-olefin polymerization can be effected with very high efficiency and isospecificity.

Research Organization:
Northwestern University, Evanston, IL (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
FG02-86ER13511
Assignee:
Northwestern University (Evanston, IL)
Patent Number(s):
5,455,317
Application Number:
08/373,869
OSTI ID:
870095
Country of Publication:
United States
Language:
English

References (15)

Stereospecific Polymerization of Propylene: An Outlook 25 Years after Its Discovery journal November 1980
Polymerization of Propene and Butene with a Chiral Zirconocene and Methylalumoxane as Cocatalyst journal June 1985
Asymmetric Oligomerization of Propene and 1-Butene with a Zirconocene/Alumoxane Catalyst journal September 1989
Stereo- and Regioselectivity of Chiral, Alkyl-substitutedansa-Zirconocene Catalysts in Methylalumoxane-activated Propene Polymerization journal March 1990
Synthesis of Optically Active Macromolecules Using Metallocene Catalysts journal January 1992
Ziegler-Natta Catalysis book January 1980
Cation-like homogeneous olefin polymerization catalysts based upon zirconocene alkyls and tris(pentafluorophenyl)borane journal April 1991
Cp-substituent additivity effects controlling the stereochemistry of the propene polymerization reaction at conformationally unrestricted (Cp-CHR1R2)2ZrCl2/methylalumoxane catalysts journal September 1991
Two-state propagation mechanism for propylene polymerization catalyzed by rac-[anti-ethylidene(1-.eta.5-tetramethylcyclopentadienyl)(1-.eta.5-indenyl)] dimethyltitanium journal October 1991
Isospecific polymerization of propylene catalyzed by rac-ethylenebis(indenyl)methylzirconium cation journal October 1991
Diastereoselectivity in the homogeneous cyclopolymerization of 1,5-hexadiene journal June 1990
Syndiospecific propylene polymerizations with Group IVB metallocenes journal August 1988
Asymmetric hydrooligomerization of propylene journal September 1987
Crystal structures and stereospecific propylene polymerizations with chiral hafnium metallocene catalysts journal October 1987
Mechanisms of stereochemical control in propylene polymerizations with soluble Group 4B metallocene/methylalumoxane catalysts journal October 1984

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Related Subjects

-olefin
/526/
1-30
13
14
15
16
4-x
4-y
acid
active
alkyl
alkylation
alpha
atoms
carbon
carbon atom
carbon atoms
catalysts
cation-like
chiral
chiral organozirconium
cocatalyst
cocatalysts
combination
complexes
complexes form
containing
corresponding
cyclopentadienyl
dichorides
disclosed
effected
efficiency
element
form
fragment
halogen
highly
highly active
homogeneous
homogeneous catalyst
homogeneous catalysts
hydrocarbyl
isospecificity
lewis
lewis acid
ligand
locations
ltoreq
metal
methylalumoxane
olefin
olefin polymer
olefin polymerization
organozirconium
organozirconium complexes
periodic
periodic table
polymerization
precatalysts
prepared
presence
propylene
radical
related
represent
species
stereoregular
stereoregular olefin
structure
substituted
substituted alkyl
synthesis
table
triarylborane
unsubstituted
unsubstituted alkyl