Patent ID: 6982237

Claim:
A catalyst precursor composition comprising: a) a mixture or reaction product of i) a magnesium halide; ii) a solvent; iii) an electron donor compound, wherein the electron donor is an alcohol; and iv) a transition metal compound wherein the transition metal is selected from Groups 3–10 and Lanthanides; and b) an inert filler; wherein said a) and b) form the catalyst precursor and wherein said catalyst precursor is spray dried, wherein the catalyst precursor composition is substantially free of other electron donor compounds, the molar ratio of the electron donor compound to magnesium is less than or equal to 1.9 and the catalyst precursor composition comprises particles having an average particle size of greater than about 10 μm, wherein said magnesium halide has a solubility in said solvent in the range of from 0.75–2.0 moles/liter.