BIMODAL POLYETHYLENE RESINS OF HIGH DENSITY AND COMPOSITION WITH IMPROVED PROPERTIES, AND WAYS OF THEIR PRODUCTION AND APPLICATION Russian patent published in 2017 - IPC C08L23/04 C08J3/00 C08F10/02 

FIELD: chemistry.

SUBSTANCE: composition contains a base resin with a density of 945 to 955 kg/m³, in the composition of which is in the amount of 45 to 55 wt % ethylene homopolymer (A) having a density of 945 to 955 kg/m³, and a copolymer of ethylene and C₄-C_8-alpha-olefin (B) having a density below the density of polymer A. In addition, the composition has a complex viscosity at a shear rate of 0.01 rad/s in the range of 220 to 450 kPa·s, a complex viscosity at a shear rate of 100 rad/s In the range from 2000 to about 2500 Pa·s and the value of the elastic modulus of the melt G'(G"=3000) at the nominal value (G") of the melt viscosity module G"=3000 Pa in the range from 1600 to about 2500 Pa. The method of preparing a bimodal polyethylene composition involves further processing in an extruder using decomposable thermal initiators such as peroxides.

EFFECT: increasing the density of the resin.

21 cl, 4 tbl