MIXTURE OF STYRENE BLOCK-COPOLYMERS AND PROPYLENE-ALPHA-OLEFIN COPOLYMERS Russian patent published in 2011 - IPC C08L23/14 C08L23/16 C08L53/02 C08L25/08 

FIELD: chemistry.

SUBSTANCE: composition contains from 30 wt % to less than 50 wt % propylene-alpha-olefin copolymer and from more than 50 wt % to 70 wt % styrene block-copolymer. The propylene-alpha-olefin copolymer has at least 70 wt % links formed from propylene, and from 10 to 25 wt % links formed from C₂- or C₄-C₁₀-alpha-olefin and has heat of fusion less than 37 J/g and melt flow index from 0.1 to 100 g/10 min. The composition has modulus of elasticity in tension less than 20 MPa, ultimate tensile stress of at least 5 MPa and elongation at failure of at least 900% and low relative instantaneous shrinkage.

EFFECT: composition has good physical properties such as elasticity and flexibility, and can also be easily processed using traditional equipment for processing polyolefins.

21 cl, 8 dwg, 2 tbl