Method of polymerization

Details Method of polymerization Method of polymerization

1977-09-06

1979-03-27

Holler, Alan

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526104, 526123, 526130, 526154, 526172, 526352, C08F 402, C08F 424, C08F 478, C08F 1000

Patent

active

041466942

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 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 ##STR1## 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 temperature of about 800.degree.-2000.degree. F. 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:
patent: 3740384 (1973-06-01), Ballard et al.
patent: 3756998 (1973-09-01), Karapinka
patent: 3844975 (1974-10-01), Karol
patent: 3953413 (1976-04-01), Hwang et al.
patent: 4016343 (1977-04-01), Hoff et al.
patent: 4035561 (1977-07-01), Hoff et al.
patent: 4041224 (1977-08-01), Hoff et al.
patent: 4053437 (1977-10-01), Liu et al.
patent: 4071673 (1978-01-01), Hwang

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