COMPOSITION OF HETEROPHASE POLYPROPYLENE WITH AN IMPROVED BALANCE OF PROPERTIES Russian patent published in 2021 - IPC C08L23/12 C08L23/10 C08L23/16 C08L23/14 

FIELD: chemical industry.

SUBSTANCE: present invention relates to a composition of heterophase polypropylene (HECO), a method for obtaining a composition of HECO, a product and a packaging product. This composition contains a matrix phase and an elastomeric phase dispersed in it, the polypropylene composition contains: from 60.0 to 93.0 wt. % of the crystalline homopolymer of propylene, from 5.0 to 20.0 wt. % elastomeric ethylene-propylene rubber and polymer nucleating agent. The crystalline homopolymer of propylene has a melting point T_m of more than 155°С. The nucleating agent contains a polymer selected from a vinyl cycloalkane polymer and a vinyl alkane polymer. A crystalline propylene homopolymer and elastomeric ethylene-propylene rubber were obtained in the presence of a catalyst with a single polymerization center on the metal. This method involves the polymerization of propylene using at least three-stage polymerization in the presence of a catalyst with a single polymerization center on the metal. This method may contain a stage of introducing a nucleating agent in the form of a masterbatch or a stage of preliminary polymerization. The product is obtained in the form of films or sheet products.

EFFECT: development of a composition of heterophase polypropylene with high rigidity, high impact strength and high transparency.

15 cl, 2 tbl, 3 ex