PROPYLENE COMPOSITION WITH IMPROVED IMPACT RESISTANCE AT LOW TEMPERATURE Russian patent published in 2018 - IPC C08L23/10 C08L23/14 C08L23/16 C08F210/02 C08F210/06 C08F210/14 

FIELD: technological processes.

SUBSTANCE: invention relates to a polypropylene composition intended for the production of cast articles and a method for production thereof. Polypropylene composition contains comonomer units derived from ethylene in an amount of 9.0 to 52.0 mol% and comonomer units derived from at least one C_5-12 α-olefin, in an amount of 0.4 to 3.0 mol%, and content of the fraction soluble in cold xylene is at least 30 wt%. Polypropylene composition is a heterophasic propylene copolymer (HECO) comprising a copolymer of propylene (C) and an elastomeric copolymer (E) representing a terpolymer (T) of units derived from propylene, ethylene in an amount of 20.0 to 80.0 mol%, and C_5-12 α-olefin in an amount of 0.1 to 1.5 mol%.

EFFECT: resulting composition has an improved balance between increased softness and impact toughness while maintaining a sufficiently high melting point to ensure thermal stability, for example, to obtain materials sterilised by steam treatment.

14 cl, 6 tbl, 7 ex