METHOD OF POLYMERISING POLYOLEFINS IN SOLUTION Russian patent published in 2012 - IPC C08F10/02 C08F4/64 

FIELD: chemistry.

SUBSTANCE: described is a method of polymerising ethylene and one or more C_3-30 α-olefins or diolefins under continuous polymerisation conditions in a solution to obtain a high-molecular weight interpolymer having narrow molecular-weight distribution and improved processability, said method involving polymerisation in the presence of a catalyst composition containing a zirconium complex of a polyvalent aryloxy ether of formula: , where: R²⁰ in each case independently denotes a group of inertly substituted arylene consisting of 6-20 atoms, excluding hydrogen or any other atoms of any other substitute, said group being substituted in a position neighbouring the oxyl-metal bond by a cyclic ligand, said cyclic ligand containing 6-30 atoms, excluding hydrogen; T³ denotes a divalent hydrocarbon or silane group having 1-20 atoms, excluding hydrogen; and R^D in each case independently denotes a univalent ligand group consisting of 1-20 atoms, excluding hydrogen, where the catalyst composition further contains a chain transfer agent which is present in the reactor in amount which is sufficient to reduce Mw of the obtained polymer by at least 30% compared to molecular weight of the polymer obtained without a chain transfer agent. Described also is a method of polymerising ethylene and one or more C_3-8 α-olefins using said zirconium complex of a polyvalent aryloxy ether, and an activating cocatalyst under continuous polymerisation conditions in a solution at temperature from 120 to 250°C with more than 85 mol % conversion of ethylene, characterised by that the obtained polymer has density between 0.855 and 0.950 g/cm³ , Mw/Mn less than 3.0, melt index (MI) from 0.1 to 40 and I₁₀/I₂>11.75(MI)^-0.188. Described is a copolymer of ethylene and one or more C_3-8 α-olefins, obtained using said method, having density between 0.855 and 0.885 g/cm³ , Mw/Mn less than 3.0, melt index (MI) from 0.1 to 40 and I₁₀/I₂>11.75(MI)^-0.188.

EFFECT: obtaining copolymers having narrow molecular-weight distribution and improved processability.

22 cl, 3 tbl, 29 ex