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