It is an object of {TAIL ~ this invention} to polymerize propylene at high productivity rates without the formation of {HEAD ~ 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 
It is an object of { TAIL ~ this invention } to polymerize propylene at high productivity rates without the formation of { HEAD ~ 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
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH