ETHYLENE POLYMERIZATION CATALYSTS FROM SUPPORTED ORGANOTRANSITION METAL-COMPLEXES .2. CHROMIUM ALKYLS

Another class of organochromium compounds, beta‐stabilized chromium alkyls, has been synthesized and tested for catalytic activity in ethylene polymerization. Although not active alone, these compounds do exhibit remarkable activity when reacted with a partially dehydroxylated high surface area carrier. The best supports seem to be fluorided alumina or the aluminophosphates, depending on the particular chromium alkyl being tested. The worst was always silica. Both divalent and tetravalent chromium alkyls were tested and found to have high catalytic activity. Comparisons of activity and polymer structure were made between these compounds and previously studied organochromium compounds with pi‐bonded ligands. Copyright © 1990 John Wiley & Sons, Inc.