Metallocenes, use in catalyst system for producing olefin polymers

摘要

A metallocene compound of formula (I): wherein M is zirconium, titanium and hafnium; X is a hydrogen atom, a halogen atom or a hydrocarbon radical; R¹ is a linear C₁-C₂₀-alkyl radical; R² is a hydrogen atom or hydrocarbon R³, R⁴, R⁵, R⁶, R⁷, and R⁸, are hydrogen atoms or hydrocarbon radicals, A is a sulphur (S) atom or an oxygen (O) atom; Q is a radical of formula (II), (III) or (IV) being bonded to the indenyl at the position indicated by the symbol *; (II), (III), (IV) wherein T¹ is a sulphur atom, an oxygen (O) atom or a NR; R⁹, R¹⁰ and R¹¹ are hydrogen atoms or hydrocarbon radicals; T², T³, T⁴, T⁵, and T⁶ are carbon atoms (C) or nitrogen atoms (N); m¹, m², m³, m⁴ and m⁵ are 0 or 1; R¹², R¹³, R¹⁴, R¹⁵ and R¹⁶ are hydrogen atoms or hydrocarbon radicals with the provisos that at least one of R¹², R¹³, R¹⁴, R¹⁵ and R¹⁶ is different from hydrogen atoms, and that no more than two of T², T³, T⁴, T⁵ and T⁶ are nitrogen atoms.