HETEROPHASE PROPYLENE COPOLYMERS Russian patent published in 2020 - IPC C08L23/12 C08F10/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a heterophase propylene copolymer with low content of an oligomer for making automobile parts. Polypropylene composition contains component A) containing 50–90 wt % propylene homopolymer, component B) containing 10–50 wt % propylene and ethylene copolymer with content of ethylene links, making 30.0–70.0 wt %. Sum of component quantities A) and B) is equal to 100. Composition has characteristic viscosity of fraction soluble in xylene at 25 °C 2.2–4.0 dl/g, MFR L index 0.5–100 g/10 min, fraction, soluble in xylene 20–50 wt %. Polypropylene composition obtained by two steps of the polymerisation process, in which the catalyst system contains 0.1–50 wt % bismuth.

EFFECT: technical result is a low content of the oligomer in the propylene composition obtained according to the present invention.

6 cl, 3 ex, 2 tbl