CLEAR AND FLEXIBLE PROPYLENE POLYMER COMPOSITION OF AND ARTICLE OBTAINED THEREFROM Russian patent published in 2007 - IPC C08F8/50 C08L23/10 C08L23/16 C08J5/18 

FIELD: polymer materials.

SUBSTANCE: invention relates to thermoplastic elastomer composition of propylene polymers and to articles obtained therefrom by means of injection casting technique. Composition is characterized by melt flow rate value (MFR 2) as measured according ISO method 1133 at 230°C under loading 2.16 kg within a range of 3 to 30 g/10 min and contains: (A) 50 to 90 wt % one or several propylene polymers including at least 85 wt % of fraction insoluble in xylene at room temperature and selected from group consisting of random propylene-ethylene copolymers with 1-7 wt % ethylene, propylene/C₄-C₈-α-olefin copolymer with 2-10 wt % C₄-C₈-α-olefins, propylene-ethylene/C₄-C₈-α-olefin copolymers with 0.5-5 wt % ethylene and 2-6 wt % C₄-C₈-α-olefins; and (B) 10-50% propylene copolymer containing 8-40 wt % ethylene and optionally 1-10 wt % C₄-C₈-α-olefins. Above-mentioned melt flow rate value MFR 2 for composition is obtained by way of destroying composition precursor containing the same A and B copolymers in above-mentioned proportions but differing in melt flow rate value (MFR 1), which ranges from 0.1 to 5 g/10 min. while MFR 2/MFR 1 ratio varies between 1.5 and 20. Articles made from the composition are characterized by good flexibility, good resistance against impact loads even at low temperatures, good optical properties, in particular opacity, and low level of chemicals emission.

EFFECT: improved consumer's properties of articles obtained from composition.

6 cl, 2 tbl, 8 ex