Patent ID: 7683003

Claim:
A method for identifying a catalyst composition comprising the steps of: A) providing a library comprising at least one procatalyst compound, B) forming a catalyst composition library by contacting the members of said procatalyst library with one or more cocatalysts and contacting the resulting mixture with an olefin monomer under olefin polymerization conditions thereby causing a polymerization reaction to take place, C) measuring at least one variable of interest during the polymerization, and D) selecting the catalyst composition of interest by reference to said measured variable; E) thereby identifying a catalyst composition for use in a heterogeneous Ziegler-Natta addition polymerization of one or more olefin monomers, wherein said catalyst composition comprises at least one said procatalyst comprising magnesium and titanium, and a cocatalyst, wherein said cocatalyst is formed by reaction of a compound of the formula: [M 4 A 1 x′ G y′ ] z′ , wherein: M 4 is a metal selected from the group consisting of B, and Al; A 1 is independently an anionic or polyanionic ligand; x′ is a number greater than zero and less than or equal to 6; G is a neutral Lewis base, optionally bound to A 1 ; y′ is a number from 0-4; z′ is a number from 1 to 10; With a compound of the formula: [(H-J 1 ) z″ A 2 ] z′″ , wherein: J 1 is NA 3 , PA 3 , S, or O; z″ is 1 or 2; A 2 is C 1-20 hydrocarbyl or inertly substituted hydrocarbyl, tri(C 1-10 hydrocarbyl)silyl, or a polyvalent derivative thereof; A 3 is hydrogen, C 1-20 hydrocarbyl or inertly substituted hydrocarbyl, or a covalent bond (when A 2 is a divalent ligand group and z″ is one); and z′″ is a number from 1 to 10.