The present invention relates to the use of alkali metal salt derivatives of certain vinyl aromatic monomers as initiators for the copolymerization of i) one or more conjugated diene monomers and ii) one or more vinyl aromatic monomers. . Furthermore, the present invention relates to a process and copolymer component for the preparation of a copolymer component comprising a coupled copolymer and a terminally modified copolymer. The present invention also relates to a method and rubber for preparing rubber. The present invention further relates to a rubber composition containing rubber. Finally, the present invention relates to a tire component including rubber and a tire including the tire component.
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