Large pore alumina-supported transition metal alkyl
AssigneeE. I. Du Pont de Nemours and Company
InventorsEdward G. Howard, Jr., Walter Mahler
Life of this patent
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Abstract
In a process for polymerizing a 1-olefin with a catalyst system comprising a reaction product of a porous alumina and an organometallic compound of the formula (RCH.sub.2).sub.4 M wherein M is Ti, Zr, or Hf and R is a group which is such that there is no hydrogen atom attached to an atom which is in the .beta.-position to M, and more specifically, R is aryl, aralkyl, tertiary alkyl, for example, trialkylmethyl, or trialkylsilyl, the improvement characterized in that the alumina has an average pore diameter of at least about 150 A and/or at least about 10% of the total pore volume of the alumina is provided by pores having diameters greater than about 200 A.
Claims5
In a 1-olefin polymerization catalyst system comprising a reaction product of a porous alumina and an organometallic compound of the formula (RCH.sub.2).sub.4 M wherein M is Ti, Zr or Hf and R is a group which is such that there is no hydrogen atom attached to an atom which is in the .beta.-position to M, the improvement characterized in that the alumina has an average pore diameter of at least about 150 A and/or at least about 10% of the total pore volume of the alumina is provided by pores having diameters greater than about 200 A.
Dependencies are inferred from the claim text.