POLYETHYLENE COMPOSITION WITH HIGH MECHANICAL PROPERTIES Russian patent published in 2017 - IPC C08L23/06 C08L23/08 C08F2/34 C08F10/02 C08F210/16 F16L9/12 

FIELD: chemistry.

SUBSTANCE: composition has a density of 0.945 to 0.955 g/cm³, MIF/MIP ratio of 30 to 45, crystallization index at SIC shift of 1.0 to 2.5 and a long chain branching index equal to or greater than 0.85. Moreover, the composition include an ethylene (co)polymer (A) with a density less than 0.960 g/cm³ and MIE melt flow index of 50-200 g/10 min and an ethylene copolymer (B) with lower MIE values, compared to the MIE value of (A), preferably below 0.5 g/10 min. At that, content of comonomer, which is selected from olefins having the formula CH₂=CHR, where R is an alkyl radical, linear or branched, containing from 1 to 10 carbon atoms, is from 1 to 3 wt % relative to the total weight of the composition.

EFFECT: composition has a good balance of physical and mechanical properties and improved resistance to cracking under environmental stress and toughness.

7 cl, 1 dwg, 1 tbl, 5 ex