CATALYTIC SYSTEM, METHOD FOR ITS PREPARATION AND METHOD FOR PRODUCING REACTOR POWDER OF ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE Russian patent published in 2021 - IPC C08F4/642 C08F110/02 

FIELD: ultra-high molecular weight polyethylene production.

SUBSTANCE: invention relates to the field of obtaining ultra-high molecular weight polyethylene UHMWPE, which has a special morphology and nanostructure, namely, to a catalytic system for obtaining a reactor powder of ultra-high molecular weight polyethylene by polymerization of ethylene based on complexes bis[2-[R¹]-4-[R²]-6-[(R³-imino)methyl]-phenoxy]titanium (IV) dichloride containing substituents R¹, R² and R³ in the following combinations: R¹ is 1-(4-tert-butylphenyl)ethyl or 1-phenylethyl, R² is a hydrogen atom, R² is pentafluorophenyl, R² is 1-phenylethyl, R² is methyl, R³ is pentafluorophenyl, R¹ is isobornyl, R² is a hydrogen atom, R³ - pentafluorophenyl, R¹ - cumyl, R² - hydrogen atom or methyl, R³ - 4-allyloxyphenyl, R¹ - tert-butyl, R² - methoxy, R³ - 4-allyloxyphenyl, and an organometallic activator consisting of a mixture of diethylaluminum chloride and di-n-butylmagnesium, which provides a reactor powder of ultra-high molecular weight polyethylene suitable for solution-free solid-phase processing into ultra-high modulus ultra-high-strength fibers and threads in an environment of aliphatic or aromatic solvents. The invention also relates to a method for preparing a catalytic system and to a method for catalytic polymerization of ethylene to obtain an ultra-high molecular weight polyethylene reactor powder.

EFFECT: increasing the activity of the catalytic system, which does not contain methylalumoxane as an activator, for the synthesis of UHMWPE and in obtaining by the claimed method using the proposed catalytic system of ultra-high molecular weight polyethylene suitable for processing by a solutionless solid-phase method.

7 cl, 1 tbl, 17 ex