METHODS OF PREPARING A POLYMERIZATION CATALYST

摘要

The invention relates to an olefin polymerization method comprising: using a catalyst which has been prepared by a method which comprises contacting a support with a chromium-containing compound and an aqueous solution comprising a trivalent titanium compound. In a further aspect the invention relates to a polymer produced by a catalyst; wherein the catalyst is produced by a method which comprises contacting a support with a chromium-containing compound and an aqueous solution comprising a trivalent titanium compound; wherein the catalyst, when contacted with an olefin monomer under suitable polymerization conditions, is effective to produce a polymer having an increased high load melt index, a lower molecular weight, a broader molecular weight distribution, or an increased melt index when compared to a polymer produced using an otherwise similar catalyst prepared with a tetravalent titanium species in aqueous solution.