US20140213433A1 - Bis-imine pyridine complex of lanthanides catalytic system comprising said bis-imine pyridine complex and process for the (co)polymerization of conjugated dienes - Google Patents

Bis-imine pyridine complex of lanthanides catalytic system comprising said bis-imine pyridine complex and process for the (co)polymerization of conjugated dienes Download PDF

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US20140213433A1
US20140213433A1 US14/344,001 US201214344001A US2014213433A1 US 20140213433 A1 US20140213433 A1 US 20140213433A1 US 201214344001 A US201214344001 A US 201214344001A US 2014213433 A1 US2014213433 A1 US 2014213433A1
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aluminium
lanthanides
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Giovanni Ricci
Anna Sommazzi
Giuseppe Leone
Aldo Boglia
Francesco Masi
Maria Caldararo
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Versalis SpA
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    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F36/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
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    • C—CHEMISTRY; METALLURGY
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    • C08F136/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F136/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
    • C08F136/02—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
    • C08F136/04—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
    • C08F136/06—Butadiene
    • C—CHEMISTRY; METALLURGY
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    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F136/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
    • C08F136/02—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
    • C08F136/04—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
    • C08F136/08—Isoprene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F36/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
    • C08F36/02—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
    • C08F36/04—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F36/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
    • C08F36/02—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
    • C08F36/04—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
    • C08F36/06—Butadiene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F36/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
    • C08F36/02—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
    • C08F36/04—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
    • C08F36/08—Isoprene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/54—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with other compounds thereof
    • C08F4/545—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with other compounds thereof rare earths being present, e.g. triethylaluminium + neodymium octanoate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2410/00—Features related to the catalyst preparation, the catalyst use or to the deactivation of the catalyst
    • C08F2410/04—Dual catalyst, i.e. use of two different catalysts, where none of the catalysts is a metallocene

Definitions

  • the present invention relates to a bis-imine pyridine complex of lanthanides.
  • the present invention relates to a bis-imine pyridine complex of lanthanides and its use in a catalytic system for the (co)polymerization of conjugated dienes.
  • the present invention also relates to a catalytic system for the (co)polymerization of conjugated dienes comprising said bis-imine pyridine complex of lanthanides.
  • the present invention relates to a (co)polymerization process of conjugated dienes, in particular a process for the polymerization of 1,3-butadiene or isoprene, characterized in that it uses said catalytic system.
  • polybutadiene 1,4-cis is a synthetic elastomer whose properties are very similar to those of natural rubber. Since the beginning of stereospecific polymerization, numerous catalytic systems have been used for the production of this elastomer, as described, for example, by Porri L. et al. in: “Comprehensive Polymer Science” (1989), Eastmond G. C. et al. Eds., Pergamon Press, Oxford, UK, Vol. 4, Part II, pages 53-108.
  • a first catalytic system capable of giving a polybutadiene having a 1,4-trans content ranging from 70% to 90% is described in U.S. Pat. No. 3,050,513 and was based on titanium compounds containing iodine, such as titanium tetraiodide (TiI 4 ), combined with an aluminium hydride such as, for example, lithium-aluminium hydride, sodium-aluminium hydride, potassium-aluminium hydride, rubidium-aluminium hydride, caesium-aluminium hydride.
  • titanium compounds containing iodine such as titanium tetraiodide (TiI 4 )
  • an aluminium hydride such as, for example, lithium-aluminium hydride, sodium-aluminium hydride, potassium-aluminium hydride, rubidium-aluminium hydride, caesium-aluminium hydride.
  • Catalytic systems capable of giving a polybutadiene having a 1,4-cis content equal to about 93% are described, for example, by W. Cooper in “The Stereo Rubbers” (1977), Ed. W. M. Saltman, Wiley, New York, page (catalytic system: AliBu 3 -TiI 4 ); W. Marconi et al., in “Chimica Industriale” (1963), Vol. 45, page 522 (catalytic system: AlEt 3 -AlEt 2 I—TiCl 4 ); W. Marconi et al., in “Journal of Polymer Science” (1965), Part A, Vol. 3, page 735 (catalytic system: AlHCl 2 .OEt 2 -TiCl 4 —AlI 3 ).
  • catalytic systems characterized by a higher stereospecificity capable of giving polybutadiene having a content of 1,4-cis units equal to about 96%, is described, for example: with respect to catalytic systems comprising cobalt, in Italian patent IT 592,477 and by Gippin M. et al. in “Industrial & Engineering Chemistry, Product Research and Development” (1962), Vol. 1(1), pages 32-39; with respect to catalytic systems comprising nickel, by Ueda et. al., in “Koogyo Kagaku Zasshi” (1963), Vol. 66, page 1103, and by Throckmorton et al. in “Rubber Chemistry and Technology” (1972), Vol. 45, pages 268-277.
  • catalytic systems comprising lanthanides such as, for example, neodymium, praseodymium and gadolinium, is also known, as described, for example, by: Hsieh H. L. et al. in “Rubber Chemistry and Technology” (1985), Vol. 58(1), pages 117-145.
  • the polybutadiene obtained using these catalytic systems has a content of 1,4-cis units of about 98%, a good processability, and a relatively large molecular weight distribution.
  • catalytic systems comprising uranium allyls capable of providing a polybutadiene having a very high content of 1,4-cis units (i.e. 99%) as described, for example, by Lugli et al. in “Die Makromoleculare Chemie” (1974), Vol. 175, Issue 7, pages 2021-2027; De Chirico A. et al. in “Die Makromoleculare Chemie” (1974), Vol. 175, Issue 7, pages 2029-2038; Bruzzone M. et al. in “Rubber Chemistry and Technology” (1974), Vol. 47, page 1175; Mazzei A. in “Die Makromoleculare Chemie” (1981), Vol. 4, Issue Supplement 3, pages 61-72.
  • These catalytic systems were also abandoned due to the presence of radioactive residues in the polymers obtained.
  • catalytic systems comprising lanthanides offered advantages with respect to the use of catalysts based on titanium, cobalt and nickel, previously proposed and in use at that time.
  • catalytic systems comprising lanthanides were capable of giving polymers, in particular polybutadiene, having a higher content of 1,4-cis units 97%), with a more linear structure and, consequently, more suitable for the production of tyres, which represents the most important application (about 80%) of polybutadiene 1,4-cis use.
  • European patent EP 0 076 535 describes an enhanced process for the (co)polymerization of conjugated diolefins comprising the use of a particular catalytic system including at least one compound of a metal selected from those of Group III B of the Periodic System having an atomic number between 21 and 103, preferably neodymium, a derivative of an organic halide and an organometallic compound containing aluminium such as, for example, alkyl aluminium hydride, or trialkyl aluminium hydride.
  • Said process allows (co)polymers having a high content of 1,4-cis units (>98%) and a high linearity, to be obtained.
  • U.S. Pat. No. 4,242,232 describes a catalyst comprising (a) a reaction mixture formed by reacting a carboxylate of a metal having an atomic number ranging from 57 to 71 such as, for example, lanthanum, cerium, praseodymium, neodymium with an aluminium tri-alkyl, (b) an aluminium alkyl and/or an aluminium alkyl hydride and (c) a Lewis acid.
  • the polybutadiene obtained by using said catalyst has a content of 1,4-cis ranging from 80 to 99%.
  • the catalytic systems comprising neodymium are obtained by reaction between neodymium trichloride, as such or complexed with donors (e.g. alcohols, ethers, tri-butyl-phosphate, alkylsulfoxides, amides, pyridine), and an aluminium tri-alkyl (e.g. aluminium tri-iso-butyl, aluminium tri-ethyl, aluminium tri-methyl): in this case, these are binary catalytic systems.
  • donors e.g. alcohols, ethers, tri-butyl-phosphate, alkylsulfoxides, amides, pyridine
  • an aluminium tri-alkyl e.g. aluminium tri-iso-butyl, aluminium tri-ethyl, aluminium tri-methyl
  • Said binary catalytic systems are described, for example, by Yang J. H. et al., in “Macromolecules” (1982), Vol. 15(2), pages 230-
  • neodymium chloride can be obtained by reaction of a neodymium compound (e.g., alcoholate, carboxylate) with a chlorine donor (e.g., di-ethyl aluminium chloride, ethyl-aluminium dichloride, bisaluminium tri-ethyl trichloride, t-butyl chloride) and then reacted with an aluminium alkyl or an aluminium tri-alkyl: in this case, these are tertiary catalytic systems. Said tertiary catalytic systems are described, for example, by: Cabassi F. et al. in “Transition Metal Catalyzed Polymerizations” (1988), Quirk R. P. Ed., Cambridge University Press, MA, USA, pages 655-670; Ricci G. et al. in “Polymer Communications Guilford” (1987), Vol. 28, Issue 8, pages 223-226; or in Italian patent IT 1,197,465.
  • the order for adding the components (chlorine donor, aluminium alkyl or aluminium tri-alkyl) to the neodymium compound can be extremely important for the nature of the catalytic system to be obtained.
  • chlorine donor, aluminium alkyl or aluminium tri-alkyl By first adding aluminium alkyl hydride or aluminium tri-alkyl and only subsequently the chlorine donor, in fact, homogeneous catalysts are obtained; vice versa, when the chlorine donor is added before the aluminium alkyl hydride or the aluminium tri-alkyl, heterogeneous systems are obtained, as described, for example, by Porri et al. in “ACS Symposium Series” (2000), Vol. 749, Chapter 2, pages 15-30.
  • the order of adding the above-mentioned components is also decisive for the catalytic activity and for the polydispersity of the resulting polymers.
  • the percentage of neodymium catalytically active is relatively low, normally ranging from 7% to 8% (said percentage referring to the molar percentage of active neodymium with respect to the total moles of neodymium charged), as described, for example, by Marina N. G. et al., in “Doklady Akademii Nauk SSSR” (1982), Vol. 265, pages 1431-1433.
  • said ternary catalytic systems can also produce polyisoprene and/or other polymers deriving from the (co)polymerization of substituted butadienes, providing (co)polymers with a high content of 1,4-cis units (i.e. content ⁇ 90%).
  • a polymer is obtained from the polymerization of isoprene, having a content of 1,4-cis units equal to about 94%, which can be advantageously used for producing elastomeric blends for the production of tyres.
  • the Applicant has faced the problem of finding a new bis-imine pyridine complex of lanthanides that can be used in a catalytic system capable of providing (co)polymers of conjugated dienes, in particular polybutadiene and polyisoprene, linear or branched, with a high content of 1,4-cis units, i.e. a content of 1,4-cis units 99% in the case of polybutadiene, and 98% in the case of polyisoprene. Furthermore, said polyisoprene has a glass transition temperature (TO similar to that of natural rubber.
  • TO glass transition temperature
  • An object of the present invention therefore relates to a bis-imine pyridine complex of lanthanides having general formula (I):
  • metal belonging to the family of lanthanides means any metal belonging to the Periodic Table of Elements having an atomic number ranging from 57 to 71.
  • Period Table of the Elements refers to the IUPAC version of the “Periodic Table of the Elements” dated Jun. 22, 2007, provided in the following Internet website www.iupac.org/reports/periodic_table.
  • C 1 -C 20 alkyl groups refers to linear or branched alkyl groups having from 1 to 20 carbon atoms. Specific examples of C 1 -C 20 alkyl groups are: methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, pentyl, hexyl, heptyl, octyl, nnonyl, n-decyl, 2-butyloctyl, 5-methylhexyl, 4-ethylhexyl, 2-ethylheptyl, 2-ethylhexyl.
  • cycloalkyl groups refers to cycloalkyl groups having from 3 to 30 carbon atoms. Said cycloalkyl groups can be optionally substituted with one or more groups, equal to or different from each other, selected from: halogen atoms; hydroxyl groups; C 1 -C 12 alkyl groups; C 1 -C 12 alkoxyl groups; cyano groups; amino groups; nitro groups.
  • cycloalkyl groups are: cyclopropyl, 2,2-difluorocyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, hexamethylcyclohexyl, pentamethylcyclopentyl, 2-cyclooctylethyl, methylcyclohexyl, methoxycyclohexyl, fluorocyclohexyl, phenylcyclohexyl.
  • aryl groups means aromatic carbocyclic groups. Said aromatic carbocyclic groups can be optionally substituted with one or more groups, equal to or different from each other, selected from: halogen atoms such as, for example, fluorine, chlorine, bromine, preferably fluorine; hydroxyl groups; C 1 -C 12 alkyl groups; C 1 -C 12 alkoxyl groups, cyano groups; amino groups; nitro groups.
  • halogen atoms such as, for example, fluorine, chlorine, bromine, preferably fluorine
  • hydroxyl groups C 1 -C 12 alkyl groups
  • C 1 -C 12 alkoxyl groups C 1 -C 12 alkoxyl groups
  • aryl groups are: phenyl, methylphenyl, trimethylphenyl, methoxyphenyl, hydroxyphenyl, phenyloxyphenyl, fluorophenyl, pentafluorophenyl, chlorophenyl, bromophenyl, nitrophenyl, dimethylaminophenyl, naphthyl, phenylnaphthyl, phenanthrene, anthracene.
  • cyclo relates to a system containing a ring containing from 3 to 6 carbon atoms, optionally also containing, in addition to the nitrogen atom, other heteroatoms selected from nitrogen, oxygen, sulfur, silicon, selenium, phosphorous.
  • cyclo are: pyridine, thiadiazole.
  • the bis-imine pyridine complex of lanthanides having general formula (I) is intended, according to the present invention, as being in any physical form such as, for example, isolated and purified solid form, solvated form with a suitable solvent, or supported on suitable organic or inorganic solids, preferably having a physical granular or powder form.
  • the bis-imine pyridine complex of lanthanides having general formula (I) is prepared starting from ligands known in the art.
  • ligands which can be used for the aim of the present invention are those having the following formulae (L1)-(L8):
  • Said ligands having formulae (L1)-(L8) can be prepared by means of processes known in the art.
  • Said ligands having formulae (L1)-(L8) can be prepared, for example, by means of condensation reactions between primary amines and diketones as described, for example, in International patent applications WO 2002/10133 and WO 2002/34701.
  • the bis-imine pyridine complex of lanthanides having general formula (I) can be prepared according to processes known in the art for the preparation of analogous complexes of other metals such as, for example, cobalt, nickel.
  • Said bis-imine pyridine complex of lanthanides can be prepared, for example, by reaction between compounds of lanthanides having general formula Ln(X) 3 wherein Ln and X have the same meanings described above, as such or complexed with ethers [for example, diethyleter, tetrahydrofuran (THF), dimethoxyethane], with ligands having formulae (L1)-(L8) indicated above, in a molar ratio ligand (L)/lanthanide (Ln) ranging from 1 to 1.5, preferably operating in the presence of at least one ether solvent [for example, tetrahydrofuran (THF)], at room temperature or higher.
  • ether solvent for example, tetrahydrofuran (THF)
  • the bis-imine pyridine complex of lanthanides thus obtained can be subsequently recovered by means of methods known in the art such as, for example, precipitation by means of a non-solvent (for example pentane), followed by separation by filtration or decanting and optional subsequent solubilization in a suitable solvent followed by low-temperature crystallization.
  • a non-solvent for example pentane
  • room temperature means a temperature ranging from 20° C. to 25° C.
  • the present invention also relates to a catalytic system for the (co)polymerization of conjugated dienes comprising said bis-imine pyridine complex of lanthanides having general formula (I).
  • a further object of the present invention therefore relates to a catalytic system for the (co)polymerization of conjugated dienes comprising:
  • aluminium alkyls (b 1 ) which are particularly useful for the aim of the present invention are: tri-methyl-aluminium, tri-(2,3,3-tri-methyl-butyl)-aluminium, tri-(2,3-di-methyl-hexyl)aluminium, tri-(2,3-di-methyl-butyl)-aluminium, tri(2,3-di-methyl-pentyl)-aluminium, tri-(2,3-di-methylheptyl)-aluminium, tri-(2-methyl-3-ethyl-pentyl)aluminium, tri-(2-methyl-3-ethyl-hexyl)-aluminium, tri(2-methyl-3-ethyl-heptyl)-aluminium, tri-(2-methyl-3-propyl-hexyl)-aluminium, tri-ethyl-aluminium, tri-(2-ethyl-3-methyl-butyl
  • aluminoxanes (b 2 ) which are particularly useful for the aim of the present invention are: methylaluminoxane (MAO), ethyl-aluminoxane, n-butyl-aluminoxane, tetra-iso-butyl-aluminoxane (TIBAO), tert-butyl-aluminoxane, tetra-(2,4,4-tri-methylpentyl)-aluminoxane (TIOAO), tetra-(2,3-di-methylbutyl)-aluminoxane (TDMBAO), tetra-(2,3,3-tri-methylbutyl)-aluminoxane (TDMBAO).
  • MAO methylaluminoxane
  • TIBAO tetra-iso-butyl-aluminoxane
  • TIOAO tert-butyl-aluminoxane
  • TIOAO tetra
  • Methylaluminoxane (MAO), tetra-iso-butyl-aluminoxane (TIBAO), are particularly preferred.
  • Said aluminoxanes can be prepared according to processes known in the art.
  • Said aluminoxanes can be prepared, for example, by reacting at least one trialkyl-aluminium or at least one di-alkyl aluminium monochloride with water or with a salt containing crystallization water such as, for example, copper sulfate pentahydrate, aluminium sulfate hexadecahydrate, in the presence of at least one organic solvent such as, for example, benzene, toluene, xylene.
  • compounds (b 3 ) having general formula (IV) which are particularly useful for the aim of the present invention are: tetrakispentafluorophenyl-borate tributylammonium-tetrakispentafluorophenyl-aluminate, tributylammonium-tetrakis-[(3,5-di-(trifluorophenyl)]-borate, tributylammonium-tetrakis-(4-fluorophenyl)]-borate, N,N-dimethylbenzylammonium-tetrakis-pentafluorophenyl-borate, N,N-dimethyl-hexylammonium-tetrakis-pentafluorophenyl-borate, N,N-dimethylanilinium-tetrakis-(pentafluorophenyl)borate, N,N-dimethylanilinium-tetrakis
  • the compounds (b 3 ) can be selected from compounds having formula B(Ar) 3 wherein Ar has the same meanings described above; or from compounds having formula B(Ar) 3 P wherein Ar has the same meanings described above and P is a pyrrole radical optionally substituted.
  • the term “moles” and “molar ratio” are used with reference to compounds consisting of molecules and also with reference to atoms and ions, omitting, for the latter, the terms gram atom or atomic ratio, even if scientifically more correct.
  • the molar ratio between the lanthanide present in the bis-imine pyridine complex of lanthanides (a) having general formula (I) and the aluminium present in the co-catalyst (b) selected from aluminium alkyls (b 1 ) or aluminoxanes (b 2 ), can range from 5 to 5,000, preferably from 10 to 1,000.
  • the molar ratio between the lanthanide present in the bis-imine pyridine complex of lanthanides (a) having general formula (I) and the boron present in the co-catalyst (b) selected from compounds (b 3 ) having general formula (IV), can range from 0.1 to 15, preferably from 0.5 to 10.
  • additives or components can be optionally added to the above catalytic system in order to adapt it so as to satisfy specific practical requirements.
  • the catalytic systems thus obtained should therefore be considered as being included in the scope of the present invention.
  • Additives and/or components which can be added in the preparation and/or formulation of the catalytic system object of the present invention are, for example, inert solvents, such as, for example, aliphatic and/or aromatic hydrocarbons; aliphatic and/or aromatic ethers; weakly coordinating additives (e.g.
  • Lewis bases selected, for example, from non-polymerizable olefins; sterically hindered or electronically poor ethers; halogenating agents such as, for example, silicon halides, hydrogenated hydrocarbons, preferably chlorinated; or mixtures thereof.
  • Said catalytic system can be prepared according to methods known in the art.
  • Said catalytic system for example, can be prepared separately (preformed) and subsequently introduced into the (co)polymerization environment.
  • said catalytic system can be prepared by reacting at least one bis-imine pyridine complex of lanthanides (a) having general formula (I) with at least one co-catalyst (b), optionally in the presence of other additives or components selected from those listed above, in the presence of a solvent such as, for example, toluene, heptane, at a temperature ranging from 20° C. to 60° C., for a time ranging from 10 seconds to 10 hours, preferably from 30 seconds to 5 hours. More details on the preparation of said catalytic system can be found in the examples provided hereunder.
  • said catalytic system can be prepared in situ, i.e. directly in the (co)polymerization environment.
  • said catalytic system can be prepared by introducing the bis-imine pyridine complex of lanthanides (a) having general formula (I), the co-catalyst (b) and the preselected conjugated diene(s) to be (co)polymerized, separately, operating under the conditions in which the (co)polymerization is carried out.
  • the above catalytic systems can also be supported on inert solids, preferably consisting of silicon and/or aluminium oxides, such as, for example, silica, alumina or silico-aluminates.
  • inert solids preferably consisting of silicon and/or aluminium oxides, such as, for example, silica, alumina or silico-aluminates.
  • the known supporting techniques can be used for supporting said catalytic systems, generally comprising the contact, in a suitable inert liquid medium, between the carrier, optionally activated by heating to temperatures higher than 200° C., and one or both of components (a) and (b) of the catalytic system object of the present invention.
  • the bis-imine pyridine complex of lanthanides (a) having general formula (I) only, or the co-catalyst (b) only can be present on the surface of the carrier.
  • the missing component on the surface is subsequently put in contact with the supported component, at the moment in which the catalyst active for the polymerization is to be formed.
  • the bis-imine pyridine complex of lanthanides having general formula (I), and the catalytic systems based thereon, which have been supported on a solid by the functionalization of the latter and the formation of a covalent bond between the solid and the bis-imine pyridine complex of lanthanides having general formula (I), are also included in the aim of the present invention.
  • the present invention also relates to a process for the (co)polymerization of conjugated dienes, characterized in that it uses said catalytic system.
  • the quantity of bis-imine pyridine complex of lanthanides (a) having general formula (I) and of co-catalyst (b) that can be used in the (co)polymerization of conjugated dienes varies according to the (co)polymerization process to be carried out. Said quantity is in any case such as to obtain a molar ratio between the lanthanide present in the bis-imine pyridine complex of lanthanides (a) having general formula (I) and the metal present in the co-catalyst (b), i.e.
  • Preferred (co)polymerizable conjugated dienes are 1,3-butadiene, isoprene.
  • the above (co)polymerizable conjugated dienes can be used alone, or in a mixture of two or more dienes. In the latter case, i.e. using a mixture of two or more dienes, a copolymer is obtained.
  • the present invention relates to a polymerization process of 1,3-butadiene or isoprene, characterized in that it uses said catalytic system.
  • Said (co)polymerization is generally carried out in the presence of a polymerization solvent generally selected from inert organic solvents such as, for example, saturated aliphatic hydrocarbons such as, for example, butane, pentane, hexane, heptane, or mixtures thereof; saturated cyclo-aliphatic hydrocarbons such as, for example, cyclopentane, cyclohexane, or mixtures thereof; mono-olefins such as, for example, 1-butene, 2-butene, or mixtures thereof; aromatic hydrocarbons such as, for example, benzene, toluene, xylene, or mixtures thereof; halogenated hydrocarbons such as, for example, methylene chloride, chloroform, carbon tetrachloride, trichloroethylene, perchloroethylene, 1,2-dichloroethane, chlorobenzene, bromobenzene, chlorotoluene, or mixtures thereof
  • said (co)polymerization can be carried out using, as (co)polymerization solvent, the same conjugated diene(s) to be (co)polymerized, according to the process known as “bulk process”.
  • the concentration of conjugated diene to be (co)polymerized in said (co)polymerization solvent generally ranges from 5% by weight to 50% by weight, preferably from 10% by weight to 20% by weight, with respect to the total weight of the conjugated diene/solvent mixture.
  • said (co)polymerization can be carried out at a temperature ranging from ⁇ 70° C. to +100° C., preferably from ⁇ 20° C. to +80° C.
  • Said (co)polymerization can be carried out either in continuous or batchwise.
  • the use of the bis-imine pyridine complex of lanthanides having general formula (I) allows (co)polymers of conjugated dienes to be obtained, in particular linear or branched polybutadiene and polyisoprene, with a high content of 1,4-cis units, i.e. a content of 1,4-cis units 99% in the case of polybutadiene, and 98% in the case of polyisoprene.
  • the mixture thus obtained was cooled to room temperature (20° C.-25° C.), 1 ml of nitric acid (HNO 3 ) at 70% was added and the mixture was then heated until the appearance of fumes. After repeating the sequence a further two times, a limpid, almost colourless solution was obtained. 1 ml of nitric acid (HNO 3 ) and about 15 ml of water were then added, without heat, and the mixture was then heated to 80° C. for about 30 minutes.
  • the sample thus prepared was diluted with water, having a MilliQ purity, up to a weight of about 50 g, weighed exactly, to obtain a solution on which analytical instrumental determination was carried out using an ICP-OES (optical detection plasma) Thermo Optek IRIS Advantage Duo spectrometer, by comparison with solutions at a known concentration.
  • ICP-OES optical detection plasma
  • Thermo Optek IRIS Advantage Duo spectrometer by comparison with solutions at a known concentration.
  • a calibration curve was prepared for each analyte, within the range of 0 ppm-10 ppm, measuring solutions having a known titre obtained by weight dilution of certified solutions.
  • samples of the bis-imine pyridine complexes of lanthanides object of the present invention about 30 mg-50 mg, were weighed exactly in 100 ml glasses in a dry-box under a stream of nitrogen. 2 g of sodium carbonate (Na 2 CO 3 ) and, outside the dry-box, ml of MillQ water, were added. The mixture was brought to boiling point, on a plate under magnetic stirring, for about 30 minutes. It was left to cool, sulfuric acid (H 2 SO 4 ) diluted 1/5, was added until the reaction became acid and the mixture was titrated with silver nitrate (AgNO 3 ) 0.1N with a potentiometer titrimeter.
  • Na 2 CO 3 sodium carbonate
  • MillQ water millQ water
  • the 13 C-HMR and 1 H-HMR spectra were registered by means of a nuclear magnetic resonance spectrometer mod.
  • Bruker Avance 400 using deuterated tetrachloroethylene (C 2 D 2 Cl 4 ) at 103° C., and hexamethyldisiloxane (HDMS) as internal standard, or using deuterated chloroform (CDCl 3 ), at 25° C., and tetramethylsilane (TMS) as internal standard.
  • microstructure of the polymers [i.e. content of 1,4-cis units (%)] was determined by analysis of the above spectra on the basis of what is indicated in literature by Mochel, V. D., in “Journal of Polymer Science Part A-1: Polymer Chemistry” (1972), Vol. 10, Issue 4, pages 1009-1018, for polybutadiene; and by Sato, H., et al., in “Journal of Polymer Science: Polymer Chemistry Edition” (1979), Vol. 17, Issue 11, pages 3551-3558 for polyisoprene.
  • the I.R. spectra were registered by means of a Bruker IFS 48 spectrophotometer.
  • the I.R. spectra (FT-IR) of the ligands used in the present invention were obtained by dispersing the ligand to be analyzed in anhydrous potassium bromide (KBr) (disks of KBr), or in a suspension of nujol.
  • KBr anhydrous potassium bromide
  • the I.R. spectra (FT-IR) of the bis-imine pyridine complexes of lanthanides object of the present invention were obtained by dispersing the bis-imine pyridine complex of lanthanides to be analyzed in anhydrous potassium bromide (KBr) (disks of KBr), or in a suspension of nujol.
  • KBr anhydrous potassium bromide
  • the I.R. spectra (FT-IR) of the polymers were obtamed from polymeric films on tablets of potassium bromide (KBr), said films being obtained by deposition of a solution of the polymer to be analyzed in hot odichlorobenzene.
  • concentration of the polymeric solutions analyzed was equal to 10% by weight with respect to the total weight of the polymeric solution.
  • the DSC (“Differential Scanning calorimetry”) thermal analysis, for determining the melting point (T m ) and the crystallization temperature (T c ) of the polymers obtamed, was carried out using a Perkin Elmer Pyris differential scanning calorimeter. For this aim, 5 mg of polymer were analyzed, with a scanning rate ranging from 1° C./min to 20° C./min, in an inert nitrogen atmosphere.
  • the DSC (“Differential Scanning calorimetry”) thermal analysis, for determining the glass transition temperature (TO of the polymers obtained and of the natural rubber (NR), was carried out by means of the above calorimeter, using the following thermal program: isotherm for 3 minutes at +70° C.; cooling from +70° C. to ⁇ 90° C. at a rate of 10° C./min; isotherm for 3 min at ⁇ 90° C.; heating from ⁇ 90° C. to +70° C. at a rate of 10° C./min.
  • the determination of the molecular weight (MW) of the polymers obtained was carried out by means of GPC (“Gel Permeation Chromatography”) operating under the following conditions:
  • M w weight average molecular weight
  • PDI polydispersity Index
  • the determination of the branching of the polymers obtained was carried out by means of the GPC/MALLS technique obtained by coupling a multi-angle light scattering detector (MALLS) with a traditional SEC/RI elution system, operating under the following conditions:
  • MALLS multi-angle light scattering detector
  • the absolute measurement can be contemporaneously carried out of the molecular weight and of the gyration radius of the macromolecules that are separated by the chromatographic system:
  • the quantity of light scattered from a macromolecular species in solution can in fact be used directly for obtaining its molecular weight, whereas the angular variation in the scattering is directly correlated to its average dimensions.
  • the fundamental relation which is used is represented by the following equation (1):
  • K* is the optical constant which depends on the wavelength of the light used, the refraction index (dn/dc) of the polymer, the solvent used;
  • M w is the weight average molecular weight;
  • c is the concentration of the polymeric solution;
  • R ⁇ is the intensity of the light scattered, measured at the angle ⁇ (excess Rayleigh factor);
  • P ⁇ is the function describing the variation of the light scattered with the angle at which it is measured, for an angle ⁇ equal to 0;
  • a 2 is the second virial coefficient.
  • K*, c, R ⁇ , M w and P ⁇ have the same meanings defined above, and by carrying out the measurement on several angles, the extrapolation to angle null of the function K*c/R ⁇ in relation to sen 2 ⁇ /2 directly provides the molecular weight from the intercept value and the gyration radius of the slope.
  • the macromolecular dimensions in solution are directly correlated to their branching degree: for the same molecular weight, the smaller the dimensions of the macromolecule with respect to the linear correspondent, the higher the branching degree will be.
  • Informations relating to the macrostructure of the polymer is qualitatively deduced from the value of the parameter ⁇ , which represents the slope of the curve which correlates the gyration radius with the molecular weight: when, under the same analysis conditions, this value decreases with respect to a macrostructure of the linear type, there is the presence of a polymer having a branched-type macrostructure.
  • the typical value of the parameter ⁇ , for linear polybutadiene having a high content of 1,4-cis units, in tetrahydrofuran (THF), is equal to 0.58-0.60.
  • FIG. 11 shows the FT-IR (nujol) spectrum of the ligand having formula (L5) obtained.
  • the complex neodymium trichloride/tetrahydrofuran [NdCl 3 (2THF)] (0.641 g; 1.6 ⁇ 10 ⁇ 3 moles) was introduced into a 100 ml reaction flask together with tetrahydrofuran (THF) (50 ml).
  • THF tetrahydrofuran
  • the whole mixture was kept under stirring, at room temperature, for 72 hours, obtaining an extremely dense white/green suspension.
  • the complex neodymium trichloride/tetrahydrofuran [NdCl 3 (2THF)] (0.305 g; 7.72 ⁇ 10 ⁇ 4 moles) was introduced into a 100 ml reaction flask together with tetrahydrofuran (THF) (35 ml).
  • THF tetrahydrofuran
  • the whole mixture was kept under stirring, at room temperature, for 2 days: at the beginning a green/yellow suspension was formed which subsequently became red-coloured as the reaction proceeded.
  • the complex neodymium trichloride/tetrahydrofuran [NdCl 3 (2THF)] (0.557 g; 1.4 ⁇ 10 ⁇ 3 moles) was introduced into a 100 ml reaction flask together with tetrahydrofuran (THF) (50 ml).
  • THF tetrahydrofuran
  • the whole mixture was kept under vigorous stirring, at room temperature, for days obtaining a relatively homogeneous greencoloured solution.
  • FIG. 12 shows the FT-IR spectrum of the complex NdCl 3 (L5).
  • the complex neodymium trichloride/tetrahydrofuran [NdCl 3 (2THF)] (0.497 g; 1.26 ⁇ 10 ⁇ 3 moles) was introduced into a 100 ml reaction flask together with tetrahydrofuran (THF) (40 ml).
  • THF tetrahydrofuran
  • the whole mixture was kept under stirring, at room temperature, for 4 days obtaining a relatively homogeneous greenish solution.
  • the complex neodymium trichloride/tetrahydrofuran [NdCl 3 (2THF)] (0.522 g; 1.32 ⁇ 10 ⁇ 3 moles) was introduced into a 100 ml reaction flask together with tetrahydrofuran (THF) (40 ml).
  • THF tetrahydrofuran
  • the whole mixture was kept under stirring, at room temperature, for 4 days obtaining a relatively homogeneous greenish solution.
  • Tetra-iso-butyl-aluminoxane (TIBAO) in a cyclohexane solution (6.2 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 2.9 g) was then added, and subsequently the complex NdCl 3 (L1) [sample GL380/P1891] (2.8 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.6 mg) obtained as described in Example 9.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 3 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.603 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Methylaluminoxane (MAO) in a toluene solution (6.3 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 0.58 g) was then added, and subsequently the complex NdCl 3 (L1) [sample GL380/P1891] (2.8 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.6 mg) obtained as described in Example 9.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 116 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.755 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Di-iso-butyl-aluminium hydride (DIBAH) (0.18 ml; 1 mmole, equal to about 144 mg) was then added, and subsequently the complex NdCl 3 (L1) [sample GL380/P1891] (2.8 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.6 mg) obtained as described in Example 9.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 8 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.443 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Tetra-iso-butyl-aluminoxane (TIBAO) in a cyclohexane solution (6.2 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 2.9 g) was then added, and subsequently the complex NdCl 3 (L2) [sample GL360] (2.8 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.9 mg) obtained as described in Example 10.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 8 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.603 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • FIG. 2( b ) shows the FT-IR spectrum of the polybutadiene obtained.
  • Methylaluminoxane (MAO) in a toluene solution (6.3 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 0.58 g) was then added, and subsequently the complex NdCl 3 (L2) [sample GL360] (2.95 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 5.9 mg) obtained as described in Example 10.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 720 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.867 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Di-iso-butyl-aluminium hydride (DIBAH) (0.18 ml; 1 mmole, equal to about 144 mg) was then added, and subsequently the complex NdCl 3 (L2) [sample GL360] (2.95 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.6 mg) obtained as described in Example 10.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 4 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.603 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Tetra-iso-butyl-aluminoxane (TIBAO) in a cyclohexane solution (6.2 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 2.9 g) was then added, and subsequently the complex NdCl 3 (L4) [sample P1888] (2.9 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.8 mg) obtained as described in Example 11.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 3 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.668 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtamed are indicated in Table 1.
  • Methylaluminoxane (MAO) in a toluene solution (6.3 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 0.58 g) was then added, and subsequently the complex NdCl 3 (L4) [sample P1888] (2.9 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.8 mg) obtained as described in Example 11.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 20 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.917 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Di-iso-butyl-aluminium hydride (DIBAH) (0.18 ml; 1 mmole, equal to about 144 mg) was then added, and subsequently the complex NdCl 3 (L4) [sample P1888] (2.9 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.8 mg) obtained as described in Example 11.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 30 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.637 g of polybutadiene having a content of 1,4-cis units equal to 99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • FIG. 3 shows the 1 H-NMR and 13 C-NMR spectra of the polybutadiene obtained.
  • Tetra-iso-butyl-aluminoxane (TIBAO) in a cyclohexane solution (6.2 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 2.9 g) was then added, and subsequently the complex NdCl 3 (L6) [sample P1965] (3.1 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 6.2 mg) obtained as described in Example 13.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 12 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 1.102 g of polybutadiene having a content of 1,4-cis units equal to 99.7%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • FIG. 5 shows the 1 H-NMR and 13 C-NMR spectra of the polybutadiene obtained.
  • Methylaluminoxane (MAO) in a toluene solution (6.3 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 0.58 g) was then added, and subsequently the complex NdCl 3 (L6) [sample P1965] (3.1 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 6.2 mg) obtained as described in Example 11.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 110 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.588 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Di-iso-butyl-aluminium hydride (0.18 ml; 1 mmole, equal to about 144 mg) was then added, and subsequently the complex NdCl 3 (L6) [sample P1965] (3.1 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 6.2 mg) obtained as described in Example 13.
  • DIBAH Di-iso-butyl-aluminium hydride
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.605 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Tetra-iso-butyl-aluminoxane (TIBAO) in a cyclohexane solution (6.2 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 2.9 g) was then added, and subsequently the complex NdCl 3 (L5) [sample P1963] (3.25 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 6.5 mg) obtained as described in Example 12.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 29 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.462 g of polybutadiene having a content of 1,4-cis units equal to 99.9%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • FIG. 2 ( c ) shows the FT-IR spectrum of the polybutadiene obtained.
  • FIG. 6 shows the 1 H-NMR and 13 C-NMR spectra of the polybutadiene obtained.
  • Methylaluminoxane (MAO) in a toluene solution (6.3 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 0.58 g) was then added, and subsequently the complex NdCl 3 (L5) [sample P1963] (3.25 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 6.5 mg) obtained as described in Example 12.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 116 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.287 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Di-iso-butyl-aluminium hydride (DIBAH) (0.18 ml; 1 mmole, equal to about 144 mg) was then added, and subsequently the complex NdCl 3 (L5) [sample P1963] (3.25 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 6.5 mg) obtained as described in Example 12.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 60 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.435 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Tetra-iso-butyl-aluminoxane (TIBAO) in a cyclohexane solution (6.2 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 2.9 g) was then added, and subsequently the complex NdCl 3 (L8) [sample P1964] (3.15 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 6.3 mg) obtained as described in Example 14.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 29 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.280 g of polybutadiene having a content of 1,4-cis units equal to 99.6%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • FIG. 2 ( d ) shows the FT-IR spectrum of the polybutadiene obtained.
  • FIG. 4 shows the 1 H-NMR and 13 C-NMR spectra of the polybutadiene obtained.
  • Methylaluminoxane (MAO) in a toluene solution (6.3 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 0.58 g) was then added, and subsequently the complex NdCl 3 (L8) [sample P1964] (3.15 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 6.3 mg) obtained as described in Example 14.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 116 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.312 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Di-iso-butyl-aluminium hydride (DIBAH) (0.18 ml; 1 mmole, equal to about 144 mg) was then added, and subsequently the complex NdCl 3 (L8) [sample P1964] (3.15 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 6.3 mg) obtained as described in Example 14.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 60 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.420 g of polybutadiene having a content of 1,4-cis units >99%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • Tri-isobutylaluminium [Al( i Bu) 2 ] (5.63 ml; 2.25 ⁇ 10 ⁇ 2 moles) was subsequently added and the solution obtained was left to age for 2 hours, under constant stirring, at 20° C., obtaining a catalytic suspension having a concentration of neodymium equal to 0.02 M.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.780 g of polybutadiene having a content of 1,4-cis units equal to about 96%: further characteristics of the process and of the polybutadiene obtained are indicated in Table 1.
  • FIG. 1 shows the 1 H-NMR spectrum of the polybutadiene obtained.
  • FIG. 2 ( a ) shows the FT-IR spectrum of the polybutadiene obtained.
  • Tetra-isobutyl-aluminoxane (TIBAO) in a cyclohexane solution (6.22 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 2.9 g) was then added, and subsequently the complex NdCl 3 (L1) [sample GL380/P1891] (2.8 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.6 mg) obtained as described in Example 9.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 45 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 1.129 g of polyisoprene having a content of 1,4-cis units equal to 98%: further characteristics of the process and of the polyisoprene obtained are indicated in Table 2.
  • FIG. 7 shows the 1 H-NMR and 13 C-NMR spectra of the polyisoprene obtained.
  • Tetra-isobutyl-aluminoxane (TIBAO) in a cyclohexane solution (6.22 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 2.9 g) was then added, and subsequently the complex NdCl 3 (L1) [sample GL380/P1891] (2.8 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.6 mg) obtained as described in Example 9.
  • the whole mixture was kept, under magnetic stirring, at 50° C., for 23 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 1.36 g of polyisoprene having a content of 1,4-cis units >98% and a glass transition temperature (T g ) equal to ⁇ 66.0° C.: further characteristics of the process and of the polyisoprene obtained are indicated in Table 2.
  • FIG. 8 shows the DSC diagram of the polyisoprene obtained.
  • Di-iso-butyl-aluminium hydride (0.18 ml; 1 mmole, equal to about 144 mg) was then added, and subsequently the complex NdCl 3 (L1) [sample GL380/P1891] (2.8 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.6 mg) obtamed as described in Example 9.
  • the whole mixture was kept, under magnetic stirring, at 50° C., for 24 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 1.36 g of polyisoprene having a content of 1,4-cis units >98%: further characteristics of the process and of the polyisoprene obtained are indicated in Table 2.
  • Tetraiso-butyl-aluminoxane (TIBAO) in a cyclohexane solution (6.22 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 2.9 g) was then added, and subsequently the complex NdCl 3 (L2) [sample GL360] (2.95 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.9 mg) obtained as described in Example 10.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 48 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.447 g of polyisoprene having a content of 1,4-cis units >98%: further characteristics of the process and of the polyisoprene obtained are indicated in Table 2.
  • Tetraiso-butyl-aluminoxane (TIBAO) in a cyclohexane solution (6.22 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 2.9 g) was then added, and subsequently the complex NdCl 3 (L4) [sample P1888] (2.9 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.8 mg) obtained as described in Example 11.
  • the whole mixture was kept, under magnetic stirring, at 20° C., for 45 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.307 g of polyisoprene having a content of 1,4-cis units >98%: further characteristics of the process and of the polyisoprene obtained are indicated in Table 2.
  • Tetraiso-butyl-aluminoxane (TIBAO) in a cyclohexane solution (6.22 ml; 1 ⁇ 10 ⁇ 2 moles, equal to about 2.9 g) was then added, and subsequently the complex NdCl 3 (L4) [sample P1888] (2.9 ml of a toluene solution at a concentration equal to 2 mg/ml; 1 ⁇ 10 ⁇ 5 moles, equal to about 5.8 mg) obtained as described in Example 11.
  • the whole mixture was kept, under magnetic stirring, at 50° C., for 22.5 hours.
  • the polymerization was then quenched by the addition of 2 ml of methanol containing a few drops of hydrochloric acid.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 1.36 g of polyisoprene having a content of 1,4-cis units >98% and a glass transition temperature (T g ) equal to ⁇ 66.3° C.: further characteristics of the process and of the polyisoprene obtained are indicated in Table 2.
  • FIG. 9 shows the DSC diagram of the polyisoprene obtained.
  • the polymer obtained was subsequently coagulated by the addition of 40 ml of a methanol solution containing 4% of antioxidant Irganox® 1076 (Ciba) obtaining 0.544 g of polyisoprene having a content of 1,4-cis units equal to about 94%: further characteristics of the process and of the polyisoprene obtained are indicated in Table 2.
  • FIG. 1 shows the 1 H-NMR spectrum of the polyisoprene obtained.

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