Method of preparing catalyst compositions from titanium tetrachloride and organoaluminum compounds

Claim 1

A PROCESS FOR PREPARING CATALYST COMPOSITIONS FOR THE POLYMERIZATION OF ETHYLENE WHICH COMPRISES (1) PRODUCING, IN SITU, TITANIUM TRICHLORIDE, BY REDUCING TITANIUM TETRACHLORIDE WITH A TRIORGANOALUMINUM COMPOUND WHEREIN THE ORGANO RADICALS ARE MANOVALENT HYDROCARBON RADICALS FREE OF ALIPHATIC UNSATURATION HAVING FROM ONE TO ABOUT EIGHTEEN CARBON ATOMS, SAID TITANIUM TETRACHLORIDE BEING EMPLOYED IN A MOLAR RATIO FROM MORE THAN 3:1 TO ABOUT 10:1 BASED ON THE TRIORGANOALUMINUM COMPOUND AND PROVIDE AN EXCESS OF TITANIUM TETRACHLORIDE, AND THEN (2) ADDING TO THE ENTIRE REACTION MIXTURE OF STEP (1) A MONOORGANOALUMINUM DICHLORIDE WHEREIN THE ORGANO RADICAL IS A MONOVALENT HYDROCARBON RADICAL FREE OF ALIPHATIC UNSATURATION HAVING FROM ONE TO ABOUT EIGHTEEN CARBON ATOMS IN A MOLAR RATIO OF ABOUT 0.1:1 TO ABOUT 10:1 BASED ON THE EXCESS TITANIUM TETRACHLORIDE ORIGINALLY EMPLOYED.