skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Homogeneous catalysts for stereoregular olefin polymerization

Patent ·
OSTI ID:869395
; ;

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 Univ., Evanston, IL (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
FG02-86ER13511
Assignee:
Northwestern University (Evanston, IL)
Patent Number(s):
5,330,948
Application Number:
07/860,784
OSTI ID:
869395
Resource Relation:
Patent File Date: 1992 Mar 31
Country of Publication:
United States
Language:
English

References (14)

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

Similar Records

Related Subjects

homogeneous
catalysts
stereoregular
olefin
polymerization
synthesis
precatalysts
chiral
organozirconium
complexes
disclosed
structure
4-x
4-y
represent
unsubstituted
locations
cyclopentadienyl
substituted
alkyl
1-30
carbon
atoms
ligand
fragment
containing
13
14
15
16
element
periodic
table
metal
hydrocarbyl
radical
halogen
ltoreq
related
prepared
alkylation
corresponding
dichorides
presence
methylalumoxane
triarylborane
cocatalysts
form
cation-like
species
highly
active
combination
lewis
acid
cocatalyst
propylene
alpha
-olefin
effected
efficiency
isospecificity
unsubstituted alkyl
homogeneous catalyst
olefin polymerization
lewis acid
carbon atoms
periodic table
carbon atom
complexes form
highly active
chiral organozirconium
organozirconium complexes
stereoregular olefin
olefin polymer
homogeneous catalysts
substituted alkyl
/502/526/999/585/