Polymerization catalyst and method

Details Polymerization catalyst and method Polymerization catalyst and method

C - Chemistry, Metallurgy

08

F

252/100, 252/52.

C08F 4/42 (2006.01) B01J 31/02 (2006.01) B01J 31/12 (2006.01)

Patent

CA 1090764

Abstract of the Disclosure A catalyst and the method of making same and a method of making polymers of 1-olefins with said catalyst in which the catalyst is prepared by chemically modifying a finely divided, difficultly reducible, inorganic support of the nature of silica, alumina, thoria, titania, magnesia and mixtures thereof by adding to the support a zirconium compound before dispersing on the modified support a chromium chelate derived from a beta-dicarbonyl compound that may be either acyclic or cyclic, the chelate being essentially of the formula Image , Image and Image . wherein R is individually selected from hydrogen, alkyl, alkenyl, aryl, cycloalkyl and cycloalkenyl radicals and combinations of these radicals with each R containing 0-20 carbon atoms and a corresponding valence-satisfying number of hydrogen atoms, R' is selected from alkylene, alkenylene, arylene, cycloalkylene and cycloalkenylene radicals and combinations of these bivalent radicals with R' containing 1-20 carbon atoms and a corresponding valence-satisfying number of hydrogen atoms, m is a whole number of 1 to 3, n is a whole number of 0 to 2 and m plus n is 2 or 3 and X is an inorganic or organic negative group (relative to chromium) such as halide, alkyl, alkoxy and the like, followed by activating by heating to and at an elevated pyrolytic temper- ature of about 800-2000°F. in a non-oxidizing (either inert or reducing) atmosphere. Typical compounds are chromium acetyl- acetonate, chromium benzoylacetonate, chromium 5,5-dimethyl-1, 3-cyclohexanedionate, chromium 2-acetylcyclohexanonate, and the like.

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