It is 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 olefins such as propylene; and it is yet a further object of this invention to provide {HEAD ~ an improved process} for producing {TAIL ~ supported titanium trichloride catalyst systems} 
It is 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 olefins such as propylene ; and it is yet a further object of this invention to provide { HEAD ~ an improved process } for producing { TAIL ~ supported titanium trichloride catalyst systems }
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