Catalyst for use in olefin polymerization or copolymerization

C - Chemistry – Metallurgy – 08 – F

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C08F 4/64 (2006.01) B01J 31/22 (2006.01) C08F 4/02 (2006.01) C08F 10/00 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2174768

A catalyst precursor is formed by providing in slurry: (1) a carrier, which is porous and in the form of particles, or spheres, preferably particles of a cross-linked polymer, having a particle diameter of about 1 to about 300 microns, a porosity of about 0.001 to about 10 cc/gm, and a surface area of about 1 to about 1,000 m2/gm; (2) a metallocene complex having an empirical formula CpmMAnBp in which Cp is an unsubstituted or substituted cyclopentadienyl group, M is zirconium, titanium, or hafnium; m is 1, 2, or 3 and each of A and B is a halogen atom, hydrogen or an alkyl group, and (3) an anion forming reagent comprising either a borate complex or a borane. An alkyl aluminum compound is used in conjunction with the catalyst as either a cocatalyst or an impurity scavenger.

Un précurseur de catalyseur est obtenu en apportant dans une boue: 1~) un support poreux constitué de particules ou de sphères, et de préférence des particules de polymère réticulé, caractérisé par un diamètre particulaire d'environ 1 à 300 microns, par une porosité d'environ 0,0001 à 10 c?3¿/g et par une aire de surface d'environ 1 à 1000 m?2¿/g; 2~) un complexe métallocène se formulant empiriquement par Cp¿m?MA¿n?B¿p?, où Cp est un groupe cyclopentadiényle non substitué ou substitué, M est zirconium, titane ou hafnium; m est 1, 2, ou 3 et chacun de A et B est un atome halogène, hydrogène ou un groupe alkyle, et 3~) un anion formant un réactif comprenant soit un complexe de borate ou un borane. Un composé alkyle aluminium est utilisé en conjonction avec la catalyseur soit comme cocatalyseur, soit comme adsorbant d'impuretés.

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