POLYETHYLENE PRODUCTION PROCESS Russian patent published in 2007 - IPC C08F10/02 C08F2/18 C08F4/64 C08F4/654 C08F4/656 

FIELD: polymer production.

SUBSTANCE: invention relates to a process for production of polyethylene with narrow molecular mass distribution (Mw/Mn=3.8-5.4) allowing production of polyethylenes with variable molecular mass. Invention, in particular, provides a process wherein polyethylene obtained is characterized by elevated melt index (MI(5)=9-100) and which process is carried out under suspension conditions at 70-100°C in hydrocarbon solvent medium in presence of supported catalyst. The latter comprises titanium compound on magnesium-containing support, which is prepared via interaction of solution of a organomagnesium compound of general formula Mg(C₆H₅)₂*nMg*Cl₂*mR₂O, wherein n=0.37-0.7, m=2, R₂O is ether with R = i-C₅H₁₁ and n=n-C₄H₉, with a silicon compound. This silicon compound is prepared by reaction of silane compound R¹ _kSiCl_4-k with silicon tetraethoxide Si(OR)₄, where R¹ represents alkyl or phenyl and k=0 or 1, at molar ratio R¹ _kSiCl_4-k/Si(OR)₄ =2-4 and temperature 15-60°C. Si/Mg ratio ranges from 1 to 2-5.

EFFECT: increased yield of polyethylene with high melt index and narrow molecular mass distribution at reduced hydrogen concentration in reaction medium.

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