TITANIUM (IV) DICHLORIDE 4-TERT-BUTYLPYROCATECHINATE PRECATALYST FOR PRODUCING ULTRAHIGH MOLECULAR WEIGHT POLYETHYLENE REACTOR POWDER, CATALYST SYSTEM FOR PRODUCING ULTRAHIGH MOLECULAR WEIGHT POLYETHYLENE REACTOR POWDER, METHOD FOR PRODUCTION THEREOF AND METHOD FOR PRODUCTION OF REACTOR POWDER OF ULTRAHIGH MOLECULAR WEIGHT POLYETHYLENE Russian patent published in 2024 - IPC C08F4/642 C08F4/634 B01J37/00 C08F110/02 

FIELD: petrochemical industry.

SUBSTANCE: described is a catalyst system for producing a reactor powder of ultrahigh molecular weight polyethylene, comprising pre-catalyst 4-tert-butylpyrocatechinate titanium (IV) dichloride [Ti], characterized by the fact that it is obtained by reacting diisopropoxytitanium (IV) dichloride, dissolved in heptane, with solution of 4-tert-butylpyrocatechol in heptane, stirring to obtain solution of 4-tert-butylpyrocatechin titanium (IV) dichloride with concentration of 6.5 mmol/l, wherein diisopropoxy titanium (IV) dichloride is obtained by mixing dry hexane, freshly distilled tetraisopropoxy titanium until complete homogenisation and by dropping titanium tetrachloride, crystallisation at room temperature in an argon atmosphere, filtration, washing of the obtained crystalline product with hexane, drying on a filter in an inert atmosphere and dissolution in an inert atmosphere in heptane, an activator of diethylaluminium chloride [Al] and a cocatalyst – an organomagnesium compound magnesium methylate [Mg], in amount providing molar ratio [Ti]/[Al]=1:600÷1500, [Mg]/[Ti]=10÷30. Method of producing said catalyst system is characterized by that, with active mixing, 0.9 M solution of diethylaluminium chloride [Al] in toluene, cocatalyst – an organomagnesium compound of magnesium methylate [Mg] are mixed sequentially, then adding a solution of precatalyst – 4-tert-butylpyrocatechinate titanium (IV) dichloride [Ti] in heptane with concentration of 6.5 mmol/l, after which the obtained solution is held while stirring for an hour to obtain a catalyst system based on the molar ratio [Ti]/[Al]=1:600÷1500, [Mg]/[Ti]=10÷30. Also described is the use of said catalyst system in the preparation of reactor powder of ultrahigh molecular weight polyethylene by catalytic polymerisation of ethylene to obtain ultrahigh molecular weight polyethylene suitable for solution-free solid-phase processing into ultrahigh-modulus super-strong fibres and threads.

EFFECT: wider range of catalyst systems for producing reactor powder of ultrahigh molecular weight polyethylene with high output of up to 554.5 kg/g of titanium, wide range of molecular weights Mv 2.9÷10.5⋅10⁶ g/mol and bulk density 0.130÷0.400 g/cm³, wider field of application of ultrahigh molecular weight polyethylene.

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