Patent ID: 8569412
Filing Date: 2013-10-29
Classification: B29C,C08F,C08L

Abstract:
1. Process for the preparation of heterophasic polypropylene compositions, comprising the steps of: producing a polypropylene polymer matrix (A) in the presence of a catalyst system comprising a Ziegler-Natta procatalyst in combination with an external donor and a cocatalyst in at least one slurry reactor transferring the slurry reactor product into a first gas phase reactor (GPR), wherein the slurry reactor product is further polymerized in the presence of the catalyst system in said first GPR transferring the first GPR product into a 2 transferring the 2 recovering the polymer product for further processing, yielding a polypropylene polymer matrix (A) containing said ethylene/propylene copolymers (B) having the same composition ratios, respectively having same ethylene content and intrinsic viscosities, so that an unimodal rubber composition is obtained adding (C) 0-15 wt % of an elastomeric ethylene/alpha-olefin random copolymer and (D) 3-25 parts per weight of inorganic filler.