Method for the preparation of a synthetic rubber blend, the blend comprising a high molecular weight diene polymer derived from butadiene monomers and, optionally, alpha olefins and further conjugated diene monomers, polymer having 55-100 % by weight of units derived from butadiene monomers and 0-45 % by weight of units derived from aromatic vinyl monomers, alpha olefins and further conjugated diene monomers, polymer further having a number average molecular weight (Mn) of from 50.000 to 1.000.000 g/mol, wherein 65 % by weight or more of the butadiene monomers are incorporated into the polymer chains in the form of the trans isomer; and a low molecular weight diene polymer having a number average molecular weight (Mn) of from 250 to 10.000 g/mol, wherein the method comprises the following steps: anionically polymerizing butadiene monomers and, optionally, one or more monomers selected from aromatic vinyl monomers, alpha olefins and further conjugated diene momomers in the presence of at least one polymerization initiator in an organic solvent, wherein the step of polymerizing the butadiene monomers and, optionally, the aromatic vinyl monomers, alpha olefins and further conjugated diene monomers comprises (i) a first stage of providing butadiene monomers and, optionally, aromatic vinyl monomers,alpha olefins and further conjugated diene monomers, and a first portion of a polymerization initiator comprising an organolithium compound, a group IIa metal salt, and an organoaluminum compound, and polymerizing the butadiene monomer up to a conversion rate of 80 %, preferably 90 %, to give a high molecular weight diene polymer, wherein 65% by weight or more of the butadiene monomers are incorporated into the polymer chains in the form of the trans isomer; and (ii) a subsequent second stage of adding a second portion of a polymerization initiator comprising an organolithium compound and polymerizing to obtain the blend of the high molecular weight diene polymer and the low molecular weight diene polymer. polymer having 55-100 % by weight of units derived from butadiene monomers and 0-45 % by weight of units derived from aromatic vinyl monomers, alpha olefins and further conjugated diene monomers, polymer further having a number average molecular weight (Mn) of from 50.000 to 1.000.000 g/mol, wherein 65 % by weight or more of the butadiene monomers are incorporated into the polymer chains in the form of the trans isomer; and a low molecular weight diene polymer having a number average molecular weight (Mn) of from 250 to 10.000 g/mol, anionically polymerizing butadiene monomers and, optionally, one or more monomers selected from aromatic vinyl monomers, alpha olefins and further conjugated diene momomers in the presence of at least one polymerization initiator in an organic solvent, wherein the step of polymerizing the butadiene monomers and, optionally, the aromatic vinyl monomers, alpha olefins and further conjugated diene monomers comprises (i) a first stage of providing butadiene monomers and, optionally, aromatic vinyl monomers,alpha olefins and further conjugated diene monomers, and a first portion of a polymerization initiator comprising an organolithium compound, a group IIa metal salt, and an organoaluminum compound, and polymerizing the butadiene monomer up to a conversion rate of 80 %, preferably 90 %, to give a high molecular weight diene polymer, wherein 65% by weight or more of the butadiene monomers are incorporated into the polymer chains in the form of the trans isomer; and (ii) a subsequent second stage of adding a second portion of a polymerization initiator comprising an organolithium compound (i) a first stage of providing butadiene monomers and, optionally, aromatic vinyl monomers,alpha olefins and further conjugated diene monomers, and a first portion of a polymerization initiator comprising an organolithium compound, a group IIa metal salt, and an organoaluminum compound, and polymerizing the butadiene monomer up to a conversion rate of 80 %, preferably 90 %, to give a high molecular weight diene polymer, wherein 65% by weight or more of the butadiene monomers are incorporated into the polymer chains in the form of the trans isomer; and (ii) a subsequent second stage of adding a second portion of a polymerization initiator comprising an organolithium compound