METALLOCENE CATALYST AND METHOD OF PREPARATION OF POLYOLEFINS Russian patent published in 2000 - IPC

FIELD: polymerization catalysts. SUBSTANCE: catalyst represents sterilely rigid metallocene compound containing at least two optionally substituted cyclopentadienyl groups as ligands linked to each other through monocyclic annular system, one of cyclopentadienyl groups being annelated to monocyclic system and this ligand system being different from 4-(η⁵-3-alkylcyclopentadienyl)-4,6,6-trimethyl-(η⁵-2- alkyl-4,5-tetrahydropentalene) group and defined by formula I: , wherein M is IVb group metal; R¹ and R², identical or different, are halogen atoms, C₁-C₁₀-alkyls, or NR132

, group with R¹³ being C₁-C₁₀-alkyl; R³,R⁴,R⁵,R⁶,R⁷,R⁸ and R⁹, identical or different, are hydrogen atoms, C₁-C₁₀-alkyls, or group -R¹³-SiR133-, with R¹³ being as indicated above; R¹⁰ is C₁-C₂₀-alkyl; R¹¹ and R¹², identical or different, are C₁-C₂₀-alkyl, C₆-C₂₀-aryl, or C₂-C₁₂-alkenyl; and n is integer from 1 to 10. Catalyst is applicable in production of polyolefins via polymerization of at least one cycloolefin. EFFECT: enabled production of olefin homopolymers and copolymers with improved physico-chemical properties, especially those with reduced crystallinity, increased impact resistance, elevated transparency, high flowability at processing temperatures, low molecular weight, and reduced melting temperature. 8 cl, 3 tbl, 33 ex