METHOD OF OBTAINING POLYETHYLENE AND COPOLYMERS OF ETHYLENE WITH ALPHA-OLEFINS WITH WIDE MOLECULAR MASS DISTRIBUTION Russian patent published in 2009 - IPC C08F4/02 C08F2/18 C08F10/02 C08F4/685 C08F4/654 C08F4/656 

FIELD: chemistry.

SUBSTANCE: present invention relates to the method of obtaining polyethylene and copolymers of ethylene with alpha-olefins with a wide range of molecular mass distribution, using Ziegler type supported catalyst, containing a compound of a transition metal on a magnesium containing carrier. The process is carried out in the presence of a catalyst which contains a vanadium compound (VCl₄, VOCI₃, V(OR)_xCl₃-_x) on a magnesium containing carrier, which is obtained from reacting a solution of organomagnesium compound with the formula: Mg(C₆H₅)₂n MgCl₂ mR₂O, where: n=0.37-0.7, m=2, R₂O is ether with R=i-Am, n-Bu, with a product of reacting alkylchlorosilane with the formula: R'_kSiCl_4-k, where R is alkyl or phenyl, k=0, 1, 2, and silicon tetraalkoxide Si(OEt)₄. Dialkylaromatic ether D is used in the organomagnesium compound MOC. Polyethylene and copolymers of ethylene and alpha-olefins with wide molecular-mass distribution are obtained using the above described catalyst in conjunction with organoaluminum co-catalyst at 50-100°C in a medium of hydrocarbon diluent. Hydrogen, taken in amount of 5-50 vol.%, is used as the regulator of molecular mass of the polymer.

EFFECT: during polymerisation of ethylene on this catalyst, polyethylene is produced with high packed density and narrow particle size distribution, as well as wide molecular mass distribution.

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