SPRAY-DRIED POLYMERIZATION CATALYST AND POLYMERIZATION PROCESSES EMPLOYING SAME

摘要

A spray-dried composition comprising an inert porous filler and a reaction product of 1) a mixture or reaction product of a magnesium halide, a solvent , an electron donor compound, and a transition metal compound. The filler is substantially spherical and has an average particle size ranging from 1 .mu. m to 12.mu.m. Methods of making spray-dried compositions, catalysts, and polymerization processes employing such compositions are also described.