Supported chromium-containing catalyst and process of polymerizi

Details Supported chromium-containing catalyst and process of polymerizi Supported chromium-containing catalyst and process of polymerizi

1974-06-13

1976-04-27

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252430, 252431R, 526 90, 526349, 526 96, C08F 402, C08F 1002

Patent

active

039534138

ABSTRACT:
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 dispersing on a finely divided, difficultly reducible, inorganic support of the nature of silica, alumina, thoria, zirconia, titania, magnesia and mixtures thereof, a chromium chelate derived from a beta-dicarbonyl compound that may be either acyclic or cyclic, the chelate being essentially of the formula ##EQU1## 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 the mixture of the supportt and chromium chelate by heating at an elevated temperature in a non-oxidizing (either inert or reducing) atmosphere. Typical compounds are chromium acetylacetonate, chromium benzoylacetonate, chromium 5,5-dimethyl-1,3-cyclohexanedionate, chromium 2-acetylcyclohexanonate, and the like.

REFERENCES:
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patent: 3392162 (1968-07-01), Zigler et al.
patent: 3513150 (1970-05-01), Matsuura et al.
patent: 3709853 (1973-01-01), Karapenka
patent: 3806500 (1974-04-01), Karol
patent: 3844975 (1974-10-01), Karol
Holne et al. J. Phys. Chem. 62 1098-1101 (1958).

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