POLYETHYLENE AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2025 - IPC C08F10/02 C08F4/659 

FIELD: chemistry.

SUBSTANCE: invention relates to polyethylene, in which a melt index measured according to ASTM D 1238 at 190 °C under load of 2.16 kg is from 15 to 40 g/10 min, melt flow index (MFR) MI₅/MI_2.16 ranges from 2.3 to 2.7, the value of the integral in the region where log Mw is 3.0 or less, on the GPC curve, where x-axis denotes log Mw and y-axis denotes dw/dlogMw, ranges from 0.8% to 1.6% of the value of the full integral, and content of linear hydrocarbon having 3 to 32 carbon atoms per 1 g of polyethylene is 600 ppm or less, when the peak area of a linear hydrocarbon having from 3 to 32 carbon atoms is converted to a polyethylene peak area on a gas chromatography/flame ionization detector (GC-FID) plot, wherein GC-FID analysis is carried out at the detector temperature of 300 °C and a residence time of 20 minutes, wherein the polyethylene contains an ethylene homopolymer or a copolymer C_4-20-alpha-olefin monomer and ethylene. Also described is a method of producing said polyethylene, comprising polymerising ethylene in the presence of a catalyst composition containing a metallocene compound of formula 1, where B is boron, M is group 4 transition metal, R₁-R₄ each independently represents a hydrogen atom, C_1-20-alkyl, C_3-20-cycloalkyl or C_6-20-aryl or R₁ and R₂ or R₃ and R₄ are connected to each other to form a substituted or unsubstituted C_6-60-aromatic ring, R₅ and R₆ each independently represents C_1-20-alkyl, C_3-20-cycloalkyl or C_6-20-aryl or R₅ and R₆ are connected to each other to form C_3-60-aliphatic ring or C_6-60-aromatic ring, X₁ and X₂ each independently represents C_1-20-alkyl or -O(CO)R', where R' is C_1-20-alkyl, Q is a substituted or unsubstituted C_2-60-hetero ring comprising any one or more atoms selected from a group consisting of N, O and S, Y and Y' are elements comprising Q, Y is N, O or S and Y' is an element Q, adjoins to Y and represents N or C.

EFFECT: polyethylene, having reduced formation of common volatile organic compounds arising from distribution of the polymer in the low-molecular region.

11 cl, 1 tbl, 6 ex

[Chemical formula 1]