Ziegler catalyst


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Ziegler catalyst

[′zē·glər ‚kad·əl·əst]
(materials)
A special catalyst developed to produce stereospecific polymers, and derived from a transition-metal halide and a metal hydride or metal alkyl.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
1.1|cents~/lb for Ziegler catalyst. However, Brockmeier said that premium will drop 30-50% as metallocene production increases.
Metallocenes leave different amounts of residues from high-activity Ziegler catalysts, he said.
Narrow-MWD resins made with Ziegler catalyst "have a tendency to fail ESCR tests for bottles and have a greater tendency toward melt fracture under blow molding conditions," says James Fargher, head of materials and development at Owens-Brockway in Toledo, Ohio.
Unlike the conventional resin made with Ziegler catalysts, the single-site-formed polymer has a narrow molecular-weight distribution.
This began in the early 1950s with experiments on Ziegler catalysts for making polyethylene.
"The Unipol II process is designed to use new super-high-activity Ziegler catalysts as well as emerging new single-site systems," says Polyolefins Div.