FIELD: polymer materials. SUBSTANCE: composition contains 10 to 95% of (i) at least one homogeneously branched substantionally linear interpolymer of ethylene with an alpha-olefin characterized by density 0.88-0.935 g, molecular weight distribution 1.8 to 2.8, melting index 0.001 to 10 g/10 min, single melting peak (measured by differential scanning calorimetry technique), lack of linear polymer fraction, strain hardening curve slope factor 1.3 to 10, and (ii) 5 to 90% of at least one heterogeneously branched ethylene-based polymer with density 0.91-0.965 g/cu.cm. EFFECT: improved physical and mechanical strength. 14 cl, 3 tbl, 8 ex
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