| 摘要 |
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 kSiCl4-k with silicon tetraethoxide Si(OR)4, where R1 represents alkyl or phenyl and k=0 or 1, at molar ratio R1 kSiCl4-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. ^ 1 tbl, 14 ex |
