| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: present invention relates to catalyst compositions, methods and polymers. Described is a catalyst composition for polymerisation of olefins which contains at least one first metallocene compound of the fourth group which contains bridging ligands of the 5-cyclopentadienyl type combined with at least one second metallocene of the fourth group which contains ligands of the 5-cyclopentadienyl type which are not bridges, at least one activator selected from a base-activator, organoalumoxane compound, organoboron or organoborate compound, or any composition thereof. ^ EFFECT: obtaining ethylene polymers with bimodal molecular-weight distribution, having good impact strength, as well as good balance between hardness and resistance to slow crack propagation. ^ 42 c, 3 dwg, 2 tbl, 13 ex |
