FIELD: chemistry.
SUBSTANCE: invention relates to new copolymers of ethylene and alpha-olefins. The copolymers have a density of 0.900-0.940 g/cm3, a melt index MI2 (2.16 kg, 190°C) of 0.01-50 g/10 min, a molecular weight distribution (Mw/Mn, determined by conventional GPC) of 2.0 to 4.5, a distribution ratio of the co-monomer Cdr>1 normalized to the melt index MI2 (2.16 kg, 190°C), a rheological index Dau (RID), [RID/MI2] 3-20 and satisfy the following equation in relation to the rheological index of Dau (RID), and an index of reducing the viscosity at shifting, IRV (2.1/210), IRV (2.1/210)≤[0.2351×RID]+C, where C has a magnitude of 3.4. Copolymers are produced in the gas phase, preferably in a single reactor in the presence of catalytic systems including activating carriers.
EFFECT: improvement of rheological properties of copolymers and their ability to be processed.
18 cl, 2 dwg, 5 tbl, 7 ex
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