Polymer blend and article of manufacture such as a tire comprising such a blend

A polymer blend comprising a copolymer and an additional polymer is disclosed. The copolymer comprises a polymeric backbone chain derived from a monomer comprising at least one conjugated diene monomer and optionally at least one vinyl aromatic monomer, and polymeric sidechains bonded to the backbone chain, the sidechains comprising a polymer immiscible with the backbone. The additional polymer consists of a polymer miscible with the polymeric sidechains.