Stabilized metallocene compounds of transition metals of group 4 and process for their preparation

• Main Authors: Masi, Francesco, Sommazzi, Anna, Borsotti, Giampietro, Ballato, Evelina, Santi, Roberto
• Format: Patent
• Language: English
• Published: 21.12.2004

The present invention relates to new stabilized metallocene compounds of transition metals of the fourth group and a process for their preparation. A metallocene compound of a metal M of group 4 in the table of elements, comprising a cyclopentadienyl group and at least one oligomeric group R′ bonded to M, having the following formula (II):wherein:A represents any monomeric unit deriving from a vinylaromatic group polymerizable by means of anionic polymerization, having from 6 to 20 carbon atoms;D represents any monomeric unit deriving from a conjugated diolefin polymerizable by means of anionic polymerization, having from 4 to 20 carbon atoms;U represents any generic optional monomeric unit deriving from an unsaturated compound copolymerizable with any of the above conjugated diolefins D or vinylaromatic compounds A;Rrepresents hydrogen or a hydrocarbyl group having from 1 to 20 carbon atoms,each index "x" and "y" can be independently zero or an integer, provided the sum (x+y) is equal to or higher than 2, preferably between 2 and 50, more preferably between 2 and 25;"z" can be zero or an integer ranging from 1 to 20.Said complex can be used for the formation of catalytic systems, in particular for the (co)polymerization of olefins, with enhanced stability and a high activity, so as to enable transportation and storage for prolonged periods of time.