Patent ID: 6153551
Filing Date: 2000-11-28
Classification: B01J,C08F,Y02P

Abstract:
A single-component contact product for homopolymerization of ethylene or copolymerization of ethylene and alpha-olefins, consisting of components (A) and (B), wherein component (A) is the contact product of silica containing hydroxyl groups and an alumoxane,wherein the molar ratio of hydroxyl groups in silica to aluminum in the alumoxane, ranges from 0.01 to 1.50; andcomponent (B) is the contact product (B) of a metallocene compound of a transition metal and a trialkylaluminum compound, wherein said contact product (B) is soluble in paraffinic hydrocarbons containing at least 5 carbon atoms,wherein the metallocene transition metal compound has the formulaCp.sub.x M(R.sup.1).sub.y (R.sup.2).sub.Zwherein Cp is a cyclopentadienyl group, unsubstituted or substituted, or part of a bicyclic or tricyclic moiety, x is 1 or 2, or when x equals 2, the cyclopentadienyl groups can be bridged, M is zirconium, hafnium, or titanium; each of R.sup.1 and R.sup.2 is selected from the group consisting of a halogen atom, a hydrogen atom, and an alkyl group providing that x+y+z is equal to the valence of M;wherein the trialkylaluminum compound in said contact product (B) is characterized by the formula Al(R.sup.3).sub.a (R.sup.4).sub.b (R.sup.5).sub.c wherein each of R.sup.3, R.sup.4, and R.sup.5 is a straight-chain or branched alkyl group containing 1 to 10 carbon atoms, wherein R.sup.3, R.sup.4, and R.sup.5 are the same or different, and wherein the sum of a+b+c is 3 andwherein said component (A) is contacted with said component (B).