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Sterically shielded diboron-containing metallocene olefin polymerization catalysts

Patent ·
OSTI ID:870055

A non-coordinating anion, preferably containing a sterically shielded diboron hydride, if combined with a cyclopenta-dienyl-substituted metallocene cation component, such as a zirconocene metallocene, is a useful olefin polymerization catalyst component. The anion preferably has the formula ##STR1## where R is branched lower alkyl, such as t-butyl.

Research Organization:
Northwestern University, Evanston, IL (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
FG02-86ER13511
Assignee:
Northwestern University (Evanston, IL)
Patent Number(s):
5,447,895
Application Number:
08/209,668
OSTI ID:
870055
Country of Publication:
United States
Language:
English

References (4)

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
Models for organometallic molecule-support complexes. Very large counterion modulation of cationic actinide alkyl reactivity journal April 1991
Cation-like homogeneous olefin polymerization catalysts based upon zirconocene alkyls and tris(pentafluorophenyl)borane journal April 1991