STERILISABLE AND IMPACT-RESISTANT POLYPROPYLENE COMPOSITION Russian patent published in 2012 - IPC C08J5/18 C08L23/10 C08L23/16 B65B29/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a heterophase polypropylene composition, films obtained using a sprinkling method and containing said heterophase polypropylene composition, and to use of said compositions to obtain films as packaging material for medicinal agents and/or food products. The film is made from the heterophase polypropylene composition which contains a matrix resin and a dispersion phase. The matrix resin contains a propylene homopolymer with MFR₂ from 0.5 to 20 g/10 min and a propylene-ethylene random copolymer with MFR₂ from 0.5 to 20 g/10 min, wherein content of ethylene in the matrix resin is equal to 0.5-3.0 wt % with respect to the entire matrix resin without any additives. The dispersion phase contains ethylene-propylene rubber. The xylene-soluble fraction of the heterophase polypropylene composition has characteristic viscosity from 1 to 2 dl/g and propylene content of more than 50 wt %.

EFFECT: disclosed film is sterilisable and has high impact resistance, as well as improved optical properties both before and after thermal sterilisation.

14 cl, 5 dwg, 1 tbl, 6 ex