Patent ID: 8809220

Claim:
A process for making a Ziegler-Natta-type catalyst precursor composition comprising contacting a Group 4 metal compound with one or more titanium compounds selected from the group consisting of Ti(OR) 4 compounds where R is ethyl, isopropyl or n-butyl in the presence of an alcohol solution comprising at least one C 2 -C 4 alcohol and Mg(OCO 2 C 2 H 5 ) 2 to form a catalyst precursor solution; adding to the catalyst precursor solution an amount of at least one filler to form a spray drying feedstock; spray drying the spray drying feedstock to obtain the Ziegler-Natta-type catalyst precursor composition comprising the molar formula Mg x TiHf y Zr z , where x is from 1 to 20, y is from 0 to 10 and z is from 0 to 10, with the proviso that y+z>0, wherein the spray drying feedstock has a neutral pH.