Patent ID: 7615602
Filing Date: 2009-11-10
Classification: C08F

Abstract:
1. Process for producing a polymer film, comprising polymerizing at least one monomer comprising propylene in the presence of a Ziegler-Natta catalyst to produce a polymer comprising propylene units and forming the polymer into a film, wherein the Ziegler-Natta catalyst comprises an olefin polymerization catalyst comprising particles of size within a predetermined range, the olefin polymerization catalyst being obtained by preparing a solution of a complex of a Gp IIa metal and an electron donor by reacting a compound of said metal with said electron donor or a precursor thereof in an organic liquid reaction medium; reacting said complex in solution with at least one compound of a transition metal a) to produce an emulsion comprising a dispersed phase containing more than 50 mol % of the Gp IIa metal in said complex; maintaining the particles of said dispersed phase within an average size range 10 to 200 μm by agitation in the presence of an emulsion stabilizer and solidifying said particles; and recovering, washing and drying said particles to obtain said catalyst component or b) to produce a first oil phase which contains more than 50 mol % of the Gp IIa metal in said complex and a second oil phase immiscible therewith, the oil of the first oil phase being denser than the oil of the second oil phase;