Polymerizations with homogeneous chromium catalysts

Autor:	E. A Zuech
Rok vydání:	1972
Předmět:	Reaction conditions Ethylene technology industry and agriculture General Engineering chemistry.chemical_element Halide Catalysis Chromium chemistry.chemical_compound chemistry Polymerization Homogeneous Polymer chemistry Pyridine Organic chemistry
Zdroj:	Journal of Polymer Science Part A-1: Polymer Chemistry. 10:3665-3672
ISSN:	1542-9350 0449-296X
DOI:	10.1002/pol.1972.170101219
Popis:	Homogeneous catalysts derived from chromium complexes and organo-aluminum compounds have been discovered which effect the polymerization of ethylene and the oligomerization of simple olefins. The applicable chromium derivatives are halide complexes of the type CrX2L2, CrX2L2(NO)2, CrX3L3, and [CrX3L2]2, wherein the ligands L are pyridine, tri-n-butylphosphine, and the like. The nature of the systems with regard to polymerization or oligomerization has been demonstrated to be primarily a function of the organoaluminum halide cocatalyst and of the reaction conditions. In general, systems containing ethylaluminum dichloride cocatalyst afford simple oligomerization products at reaction temperatures above 50°C, while at lower temperatures those containing organoaluminums of the type R3Al2X3 or R2AlX effect the polymerization of ethylene as the principal reaction.
Databáze:	OpenAIRE
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