Stabilized metallocene compounds of transition metals of group 4 and process for their preparation
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...
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21.12.2004
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Abstract | 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. |
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AbstractList | 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. |
Author | Ballato, Evelina Masi, Francesco Sommazzi, Anna Borsotti, Giampietro Santi, Roberto |
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References | Masi et al. (6184316) 20010200 K. Kasai, et al., Journal of the Chemical Society, Chemical Communications, vol. 1, XP-001148917, pp. 109-110, "Chemoselective Carbon-Carbon Bond Formation Reactions of Zirconacyclopentenes" 1995. (0 801 079) 19971000 L. Yong, et al., Journal of Molecular Catalysis A: Chemical, vol. 184, No. 1-2, XP-001150381, pp. 147-150, "Organotitanium Chemistry: Substituent Effects on the Dimerization of Isoprene Catalized by Alkenyl-Substituted Cyclopentadientyl Titanium Complexes", 2002. R. Hara, et al., Tetrahedron Letters, vol. 38, No. 3, XP-004015032, pp. 447-450, "Coupling Reaction of Alkenylzirconocenes with Aryl or Alkenyl Iodides in the Presence of CuCl/Pd(PPh3)4"Jan. 20, 1997. X. Tao, et al., Journal of Molecular Catalysis A: Chemical, vol. 156, No. 1-2, XP-001150379, pp. 121-126, "Substituent Effect on Oligomerization of Isoprene Catalized by Ring-Substituted (RCp)2TlCl2/i-C3H7MgCl System", 2000. E.-I. Negishi, et al., Tetrahedron Letters, vol. 25, No. 32, XP-001148892, pp. 3407-3410, "Reaction of Alkenes and Dienes with T-Butylmagnesium Halides and Zirconocene Dihalides. A Convenient Procedure for Hydrozirconation and a Novel T-Butylzirconation of Conjugated Alkenes", 1984. (WO 95/00526) 19950100 Chemical Abstracts, vol. 131, No. 3, p. 596, XP-002238485, JP 11-165075, Jun. 22, 1999. |
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Snippet | The present invention relates to new stabilized metallocene compounds of transition metals of the fourth group and a process for their preparation.
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