METHOD FOR MANUFACTURING POLYPROPYLENE HAVING HIGH TRANSPARENCY

摘要

A method for manufacturing polypropylene with high transparency is provided to increase the amount of an internal nucleating agent and its dispersion degree by using whole polymerization. A method for manufacturing polypropylene with high transparency comprises the steps of: (i) preparing prepolymer by polymerizing alpha-olefin, vinyl cyclic saturated hydrocarbon, alpha-olefin or hydrogen, and vinyl cyclic saturated hydrocarbon successively in the presence of a Ziegler-Natta catalyst and an external electron donor; and (ii) polymerizing propylene by using the whole pre-polymer. The outside electron donor is an organic silane compound.