Olefin polymerization catalyst system and process for polymeriza

Details Olefin polymerization catalyst system and process for polymeriza Olefin polymerization catalyst system and process for polymeriza

1975-07-30

1976-07-27

Holler, Alan

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

Synthetic resins

Polymerizing in two or more physically distinct zones

526 82, 526154, 526160, 526349, 526351, 526352, C08F 206, C08F 402, C08F 476

Patent

active

039717674

ABSTRACT:
There are disclosed a novel class of catalysts for olefin polymerization, processes for the production of this class of catalysts and processes for the production of linear polyolefins, including linear polyethylene, linear polypropylene and linear copolymers of ethylene with higher olefins, using this class of catalysts. The new class of catalysts comprises Group IV(a) transition metal hydrocarbyl hydride aluminates supported on alumina. The catalysts are produced by reacting a tetra(hydrocarbyl) transition metal compound [(R--CH.sub.2).sub.4 --M in which R is aryl, aralkyl or tertiary alkyl, and M is Ti, Zr or Hf] with partially hydrated (0.5 to 1.5% water of hydration) alumina to produce hydrocarbyl-transition metal aluminates on alumina followed by hydrogenation until from about 60% to 100%, preferably 90% to 100%, of the hydrocarbyl groups have been displaced and partially replaced by hydride, and the valence state of the transition metal has been reduced. The catalysts are of exceptionally high activity for the polymerization of olefins, and the catalyst residues are innocuous and do not need to be removed from the resultant polymers.

REFERENCES:
patent: 3635935 (1972-01-01), Long
patent: 3681317 (1972-08-01), Pioli et al.
patent: 3712874 (1973-01-01), Kruse
patent: 3840508 (1974-10-01), Ballard et al.
patent: 3840511 (1974-10-01), Ballard et al.
patent: 3875132 (1975-04-01), Kruse

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