POLYETHYLENE COMPOSITION Russian patent published in 2017 - IPC C08L23/08 F16L9/12 

FIELD: chemistry.

SUBSTANCE: composition contains from 40 to 55 wt % of the fraction (A) of ethylene copolymer and from 0.3 to 1 mol % C₄-C₁₀ of alpha-olefin with melt index MI₂ (2.16 kg, 190°C) from 320 to 500 g/10 min and a density of 963 to 973 kg/m³ and from 45 to 60 wt % of the fraction (B) of ethylene copolymer and from 0.3 to 1 mol % C₄-C₁₀ of alpha-olefin. And the density of the composition in the unpainted state is from 940 to 956 kg/m³, melt index MI₅ (5 kg, 190°C) from 0.1 to 1 g/10 min and a viscosity at high shear stress η_210kPa from 2 to 6 kPa⋅s. In addition, the composition has a homogeneous or inverse distribution of the comonomer in both fractions (A) and (B).

EFFECT: composition of the invention has a good balance of strength, flexibility and workability.

10 dwg,1 tbl, 3 ex