COMPOSITION BASED ON POLYPROPYLENE WITH STYRENE-BASED ELASTOMERS Russian patent published in 2013 - IPC C08L23/10 C08L23/14 C08L25/08 C08L53/02 C08J5/18 

FIELD: chemistry.

SUBSTANCE: invention relates to a polymer composition which is used to make sterilisable containers, for example, sterilisable bags or medical packaging for intravenous solutions, for example. The composition contains a heterophase propylene copolymer and styrene-based elastomer(s), wherein the ratio of the flow rate MFR₂ (230°C) of the heterophase propylene copolymer to the flow rate MFR₂ (230°C) of the styrene-based elastomer (MFR₂ (230°C) (A)/MFR₂ (230°C)(B))≤1.0. The heterophase copolymer contains a polypropylene matrix and an elastomeric propylene copolymer which contains at least one comonomer selected from a group comprising ethylene and C₄-C₂₀ alpha-olefins. The weight content of styrene in each styrene-based elastomer is equal to less than 15%, and the total weight content of styrene-based elastomers (B) from the total amount of polymers in the polymer composition ranges from 16.0 to 46.0%. The polymer composition disclosed herein is particularly suitable for making heat-sealable films.

EFFECT: polymer composition provides high air-tightness of articles made therefrom after sterilisation while maintaining high strength and dullness.

22 cl, 3 tbl