FIELD: chemistry.
SUBSTANCE: present invention relates to an ethylene polymer, as well as an article containing an ethylene polymer, and a polymerisation method. Ethylene polymer has density from 0.952 g/cm3 to 0.965 g/cm3, high shear stress melt index (HLMI) from 5 to 25 g/10 min, weight average molecular weight from 275,000 to 450,000 g/mol, number average molecular weight from 15,000 to 28,000 g/mol, viscosity at HLMI from 1400 to 4000 Pa⋅c and tan δ at 0.1 s-1 from 0.65 to 0.98°. Polymerisation method involves bringing the catalyst composition into contact with ethylene and alpha-olefin in a polymerisation reactor system under polymerisation conditions to obtain an ethylene polymer. Catalyst composition contains a non-bridged metallocene compound, a bridged metallocene compound, an activator support and an organoaluminium compound.
EFFECT: obtained polymers have technological characteristics of ethylene polymers obtained using a chromium-based catalyst system but have improved resistance to stress cracking and can be used in blow moulding large parts.
10 cl, 3 dwg, 4 tbl, 10 ex
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