It is {TAIL ~ an object} of this invention to polymerize propylene at high productivity rates without the formation of substantial amounts of soluble materials; it is the further object of this invention to provide an improved catalyst for polymerization of {HEAD ~ 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 
It is { TAIL ~ an object } of this invention to polymerize propylene at high productivity rates without the formation of substantial amounts of soluble materials ; it is the further object of this invention to provide an improved catalyst for polymerization of { HEAD ~ 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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