This invention relates to {TAIL ~ the polymerization} of unsaturated hydrocarbons over Ziegler type catalysts, and more particularly, to processes for formulating {HEAD ~ such catalysts} by sequentially mixing the various components thereof and controlling the orders of addition and the durations of mixing such catalyst components 
This invention relates to { TAIL ~ the polymerization } of unsaturated hydrocarbons over Ziegler type catalysts , and more particularly , to processes for formulating { HEAD ~ such catalysts } by sequentially mixing the various components thereof and controlling the orders of addition and the durations of mixing such catalyst components
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