POLYETHYLENE COMPOSITION AND USE THEREOF IN POLYOLEFIN COMPOSITIONS Russian patent published in 2018 - IPC C08L23/06 C08L23/08 C08F210/02 

FIELD: chemistry.

SUBSTANCE: present invention relates to a polyethylene composition having a fusion enthalpy ΔH_fus, measured by differential scanning calorimetry at a heating rate of 20 °C per minute, with a heat flux of 60 J/g or higher, preferably 70 J/g or higher, and containing (all values in weight percentages): (A) 25–55 %, preferably 30–45 % polyethylene, containing in relation to the weight of A) 10 % or less, preferably 8 % or less, more preferably 5 % or less of the XS_A fraction, soluble in xylene at 25 °C; (B) 45–75 %, preferably 55–70 % of a copolymer of ethylene and propylene, containing from 45 to 70 %, preferably from 50 to 70 % ethylene, and 60 % or more, preferably 65 % or more, in particular 70 % or more of the XS_B fraction, soluble in xylene at 25 °C, wherein the amount of ethylene and the amount of the XS_B fraction is given in relation to the weight of B), in which the amounts of A) and B) are given in relation to the total weight of A) + B). Invention also relates to a polymerisation process for preparing said polyethylene composition, a polyolefin composition containing said composition and moulded articles from such a polyolefin composition.

EFFECT: technical result is obtaining a polyethylene composition well suited to obtain the end polyolefin compositions with excellent optical properties and high impact strength.

12 cl, 3 tbl, 1 ex