Plasto-elastic polypropylene compositions

A polypropylene composition, in the form of spheroidal flowable particles, obtained by sequential polymerization in at least two steps wherein components (B) and (C) are polymerized in the presence of component (A) polymerized in the first step, comprising;

• (A) 10-60 parts by weight of homopolymer polypropylene with isotactic index greater than 90, or of crystalline propylene copolymer with ethylene, with a CH.sub.2 .dbd.CHR olefin where R is a 2-6 carbon alkyl radical, or combinations thereof, containing over 85% by weight of propylene and having an isotactic index greater than 85;
• (B) 10-40 parts by weight of a crystalline, polymer fraction containing ethylene and propylene, having an ethylene content of from about 52.4% to about 74.6% and insoluble in xylene at room temperature;
• (C) 30-60 parts by weight of an amorphous ethylene-propylene copolymer fraction containing optionally small proportions of a diene, soluble in xylene at room temperature and containing 40 to 70% by weight ethylene;
• said composition having a flex modulus smaller than 700 MPa, tension set at 75% less than 60%, tensile stress greater than 6 Mpa and notched Izod resilience at -20.degree. and -40.degree. C. greater than 600 J/m.