NITROGEN TITANIUM COMPLEX, CATALYTIC SYSTEM COMPRISING SAID NITROGEN TITANIUM COMPLEX AND PROCESS FOR THE (CO)POLYMERIZATION OF CONJUGATED DIENES

摘要

Nitrogen titanium complex having general formula (I) or (II), wherein R₁ represents a hydrogen atom or is selected from linear or branched C₁-C₂₀ alkyl groups, preferably C₁-C₁₅, optionally halogenated, cycloalkyl groups optionally substituted, aryl groups optionally substituted; R₂, R₃, R₄ and R₅, identical or different, represent a hydrogen atom or are selected from linear or branched C₁-C₂₀ alkyl groups, preferably C₁-C₁₅, optionally halogenated, cycloalkyl groups optionally substituted, aryl groups optionally substituted, nitro groups, hydroxyl groups, amino groups; Y represents a NH-R₆ group, wherein R₆ represents a hydrogen atom or is selected from linear or branched C₁-C₂₀ alkyl groups, preferably C₁-C₁₅, optionally halogenated, cycloalkyl groups optionally substituted, aryl groups optionally substituted, or a N-R₇ group, wherein R₇ is selected from linear or branched C₁-C₂₀ alkyl groups, preferably C₁-C₁₅, optionally halogenated, cycloalkyl groups optionally substituted, aryl groups optionally substituted; X₁, X₂, X₃ and X₄, identical or different, represent a halogen atom, such as, for example, chlorine, bromine, iodine, preferably chlorine; or are selected from linear or branched C₁-C₂₀ alkyl groups, preferably C₁-C₁₅, -OCOR₈ or -OR₈ groups, wherein R₈ is selected from linear or branched C₁-C₂₀ alkyl groups, preferably C₁-C₁₅; or one of X₁, X₂ and X₃ is selected from ethers, such as, for example, diethylether, tetrahydrofuran (THF), dimethoxyethane, preferably tetrahydrofuran (THF); n is 1 in the case wherein Y represents a NH-R₆ group, wherein R₆ has the same meanings reported above, or is 0 in the case wherein Y represents a N-R₇ group, wherein R₇ has the same meanings reported above, or in the case wherein one of X₁, X₂ and X₃ is selected from ethers; R'₁, R'₂, R'₃, R'₄, R'₅, R'₆ and R'₇, identical or different, represent a hydrogen atom or are selected from linear or branched C₁-C₂₀ alkyl groups, preferably C₁-C₁₅, optionally halogenated, cycloalkyl groups optionally substituted, aryl groups optionally substituted; X'₁ and X'₂, identical or different, represent a halogen atom, such as, for example, chlorine, bromine, iodine, preferably chlorine; or are selected from linear or branched C₁-C₂₀ alkyl groups, preferably C₁-C₁₅, -OCOR'₈ groups or -OR'₈ groups, wherein R'₈ is selected from linear or branched C₁-C₂₀ alkyl groups, preferably C₁-C₁₅; Y' is selected from ethers, such as, for example, diethylether, tetrahydrofuran (THF), dimethoxyethane, preferably is tetrahydrofuran (THF); or Y' represents a group having general formula (III), wherein R'₁, R'₂, R'₃, R'₄, R'₅, R'₆ and R'₇ have the same meanings as reported above; m is 0 or 1. Said nitrogen titanium complex having general formula (I) or (II) can be advantageously used in a catalytic system for the (co)polymerization of conjugated dienes.