In-situ reactor blends of Ziegler-Natta catalyzed nucleated polypropylene and metallocene catalyzed polypropylene

A process for the preparation of an isotactic propylene polymer composition comprising reacting isotactic propylene in one or more reaction steps in the presence of a catalyst system comprising 45 to 99 wt% of a metallocene catalyst and 1 to 55 wt% of a Ziegler Natta catalyst, in the presence of a catalyst system comprising 45 to 99 wt% of a metallocene catalyst and 1 to 55 wt% of a Ziegler Natta catalyst, propylene and optionally one or more comonomers selected from ethylene and alpha-olefins containing from 4 to 12 carbon atoms are polymerized, which Ziegler Natta catalyst has a non-phthalate internal donor and has been pre-polymerized with a monomer (I) having the general formula CH2 = CH-CHR1R2 (I) wherein R1 and R2 are individual alkyl groups having one or more carbon atoms, or forming an optionally substituted saturated, unsaturated or aromatic ring or fused ring system containing from 4 to 20 carbon atoms. 一种用于制备全同立构丙烯聚合物组合物的方法，包括在一个或多个反应步骤中，在包含45至99重量％的茂金属催化剂和1至55重量％的齐格勒纳塔催化剂的催化剂体系的存在下，使丙烯和任选的一种或多种选自乙