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A composition which can be used in, for example, slurry polymerization of an olefin such as, for example, ethylene is produced by a process comprising: (1) combining a first transition metal compound and a metal halide to form a solution; (2) contacting the solution with a precipitating agent to for

A composition which can be used in, for example, slurry polymerization of an olefin such as, for example, ethylene is produced by a process comprising: (1) combining a first transition metal compound and a metal halide to form a solution; (2) contacting the solution with a precipitating agent to form a solid catalyst intermediate; (3) contacting the solid catalyst intermediate with a second transition metal compound to produce a catalyst composition; and optionally (4) depositing a prepolymer onto the catalyst composition. The precipitating agent comprises a sufficient amount of both a Lewis acid and an ether to effect the precipitation of a solid. Also disclosed is the use of the composition in polymerization of an olefin.

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[ That which is claimed:] [1.] A process comprising: (1) combining a first transition metal compound and a metal halide, in a solvent, to form a solution; (2) contacting said solution with a precipitating agent to form a solid catalyst intermediate wherein said precipitating agent comprises a suffic

[ That which is claimed:] [1.] A process comprising: (1) combining a first transition metal compound and a metal halide, in a solvent, to form a solution; (2) contacting said solution with a precipitating agent to form a solid catalyst intermediate wherein said precipitating agent comprises a sufficient amount of both a Lewis acid and an ether to effect the precipitation of said catalyst intermediate; and (3) contacting said solid catalyst intermediate with a second transition metal compound to produce a catalyst composition.