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Olefinpolymerization with highly active soluble zirconium compounds using aluminoxane as co‐catalyst
Author(s) -
Kaminsky Walter,
Külper Klaus,
Niedoba Stefan
Publication year - 1986
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19860030128
Subject(s) - methylaluminoxane , tacticity , polyethylene , polypropylene , zirconium , metallocene , materials science , catalysis , polymer chemistry , cyclopentadienyl complex , post metallocene catalyst , ethylene , polymerization , linear low density polyethylene , organic chemistry , chemistry , polymer , composite material , metallurgy
The homogeneous Ziegler‐Natta–catalysts, consisting of a zirconocene compound and methyl‐aluminoxane, lead to extremely high polymerization activities. With bis(cyclopentadienyl)zirconium dichloride pure atactic polypropylene and polyethylene with activities up to 30.10 6 g PE/g Zr·h are formed. The higher the degree of oligomerization of the aluminoxane the more active are the catalysts. The density of polyethylene (LLDPE) can be lowered by using 1‐butene or 1‐hexene as comonomers. Incorporation of dienes gives EPDM‐elastomers. Highly isotactic polypropylene can be prepared by using chiral rac‐ethylene bis–(tetrahydroindenyl) zirconium dichloride together with methylaluminoxane as cocatalyst. The toluene soluble part here consists of less than 0.2 weight percent. After resolution of this racemate it is also possible to produce optically active polypropylene and polybutene.