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