| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: described is a method of polymerising ethylene and one or more C3-30 -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 RD 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 C3-8 -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 250C 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 C3-8 -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 |
