METALLOCENES, METHOD OF PREPARING THEREOF, CATALYST SYSTEM, METHOD OF PREPARING POLYOLEFINS, AND MOLDED POLYMERIC PRODUCT Russian patent published in 2000 - IPC

FIELD: chemical industry. SUBSTANCE: described are new polynuclear metallocene compounds of formula I: wherein M¹ is metal of IV b group of the Periodic Table; X is halogen atom; L and L′ are the same or different and denote substituted cyclopentadienyl optionally substituted indoenyl and unsubstituted fluorhenyl; B is group of formula (a) wherein R¹ is divalent hydrocarbon bridge group, R² residues are the same and denote C₁-C₄ alkyl group; M² is silicon. Also described are method of preparing said compounds, catalyst system comprising thereof, method of preparing polyolefins, and molded polymeric product. EFFECT: more efficient preparation method. 11 cl, 22 ex