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