It is an object of this invention to polymerize propylene at {HEAD ~ high productivity rates} without {TAIL ~ the formation} of substantial amounts of soluble materials; it is the further object of this invention to provide an improved catalyst for polymerization of olefins such as propylene; and it is yet a further object of this invention to provide an improved process for producing supported titanium trichloride catalyst systems 
without
It is an object of this invention to polymerize propylene at { HEAD ~ high productivity rates } without { TAIL ~ the formation } of substantial amounts of soluble materials ; it is the further object of this invention to provide an improved catalyst for polymerization of olefins such as propylene ; and it is yet a further object of this invention to provide an improved process for producing supported titanium trichloride catalyst systems
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