METHOD FOR HIGH-TEMPERATURE SOLUTION POLYMERISATION OF POLYETHYLENE Russian patent published in 2012 - IPC C08F210/02 C08F4/76 C08F2/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for polymerisation of ethylene and one or more C₃-₃₀ α-olefins or diolefins in continuous solution polymerisation conditions to obtain a high-molecular weight polymer. The method involves carrying out polymerisation in the presence of a catalyst composition containing a cocatalyst and a zirconium or hafnium complex of a polyvalent aryloxyether of formula: , where M³ is Hf or Zr, preferably Zr; Ar⁴ has the formula: , where R¹¹, in each case independently, denotes hydrogen, hydrocarbyl containing up to 50 atoms not counting hydrogen, under the condition that in at least one case, R¹¹ is spatially volumetric; T⁴, in each case independently, denotes a C_2-20 alkylene group; R²¹, in each case independently, denotes hydrogen, hydrocarbyl containing up to 50 atoms not counting hydrogen; R³, in each case independently, denotes hydrogen, hydrocarbyl containing up to 50 atoms; R^D denotes a hydrocarbyl group containing up to 20 atoms not counting hydrogen. At least two R³ groups located on different arylene-oxy groups are spatially volumetric. The polymers have molecular-weight distribution (M_w/M_n) of less than or equal to 3.0. Content of comonomer gives the polymer density of 0.850-0.950 and the polymer has properties l₁₀ and I₂ which satisfy the relationship I₁₀/l₂≤10,32 (MI)^-0.0814 for values of MI in the range of 0.01-50. A metal complex of a polyvalent aryloxyether is also disclosed.

EFFECT: invention enables to obtain improved polymers.

20 cl, 1 dwg, 3 tbl, 8 ex