POLYPROPYLENE COMPOSITION, PROCESS FOR PREPARING THE SAME, AND POLYMERIZATION CATALYST THEREFOR

摘要

A polypropylene composition comprising 0.001 to 10 parts by weight of a polyethylene having an intrinsic viscosity [etaE] of 0.01 to less than 15 dl/g s measured in tetralin at 135° C. and 100 parts by weight of a polyolefin comprising at least polypropylene, wherein the polyethylene is finely dispersed as particles with a number average particle diameter of, e.g., 1 to 5000 nm in the polyolefin comprising at least polypropylene. By virtue of the above constitution, the polypropylene composition has excellent transparency and rigidity, is free from the creation of a sweeper roll flow mark in the preparation of a film and substantially free from a neck-in phenomenon of a film, and has high productivity.