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Reactor blending with early/late transition metal catalyst combinations in ethylene polymerization
Author(s) -
Mecking Stefan
Publication year - 1999
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19990301)20:3<139::aid-marc139>3.0.co;2-r
Subject(s) - cationic polymerization , catalysis , ethylene , metallocene , polyethylene , polymer chemistry , nickel , materials science , transition metal , post metallocene catalyst , polymerization , linear low density polyethylene , chemistry , organic chemistry , polymer , composite material , metallurgy
Ethylene is polymerized by heterobimetallic combinations of early and late transition metal catalysts. Dual combinations of zirconocenes and cationic nickel and iron catalysts with multidentate nitrogen‐donor ligands are described. Reactor blends of linear and branched ethylene homopolymers are obtained. With zirconocene / nickel complex catalyst combinations, addition of hydrogen selectively reduces the molecular weight of the linear polyethylene formed by the metallocene catalyst.