Bis-imine titanium complex, catalytic system comprising said bis-imine titanium complex and process for the (co)polymertzation of conjugated dienes

Catalytic system for the (co)polymerization of conjugated dienes comprising:

• (a) at least one bis-imine titanium complex having general formula (I)
• wherein:
• R1 and R2, mutually identical or different, represent a hydrogen atom;
• linear or branched, optionally halogenated, C1-C20 alkyl groups;
• or optionally substituted cycloalkyl groups;
• R3 and R4, mutually identical or different, represent a hydrogen atom;
• linear or branched, optionally halogenated, C1-C20 alkyl groups;
• optionally substituted cycloalkyl groups;
• or optionally substituted aryl groups;
• X1, X2, X3 and X4, mutually identical or different, represent at least one halogen atom chlorine, bromine, or iodine;
• linear or branched C1-C20 alkyl groups, —OCOR5 groups or —OR5 groups wherein R5 is linear or branched C1-C20 alkyl groups;
• or an acetylacetonate group (acac);
• provided that when R1 and R2 represent a methyl group and X1, X2, X3 and X4 represent a chlorine atom, R3 and R4 are different from 2,6-di-iso-propylphenyl;
• (b) at least one co-catalyst including organic compounds of an element M′ other than carbon, said M′ element being at least one of the elements boron, aluminum, zinc, magnesium, gallium, or tin.