Thermoplastic polyolefins with high flowability and excellent surface quality produced by a multistage process

摘要: Reactor grade thermoplastic polyolefins with high flowability and excellent surface quality comprising (A) 40-90 wt % of a propylene homo- or copolymer matrix an MFR in accordance ISO 1 133 (230° C., 2.16 kg load) >200 g/10 min (B) 2-30 elastomeric ethylene-propylene having intrinsic viscosity IV (according to 1628 decalin as solvent) ≦2.8 dl/g ethylene content >50 80 (C) 8-30 3.0-6.5 50 %, the reactor being obtainable by multistage polymerization process at least 3 steps presence catalyst system (i) Ziegler-Natta procatalyst which contains trans-esterification product lower alcohol phthalic ester (ii) organometallic cocatalyst (iii) external donor represented formula (I) Si(OCH 2 CH ) (NR R wherein can be same different represent hydrocarbon group 12 carbon atoms, well use these molded articles produced from them.