Patent ID: 10125210

Abstract:
A multiblock copolymer, obtainable by copolymerization of a conjugated diene compound and a non-conjugated olefin, wherein: a structure of the multiblock copolymer includes A-(B-A)x and/or B-(A-B)x, wherein “A” represents a block portion constituted of monomer units of a non-conjugated olefin, “B” represents a block portion constituted of monomer units of a conjugated diene compound, and “x” represents an integer ≥1; content of the non-conjugated olefin portion is ≤30 mass %; and storage modulus G′ at 130° C., measured by rubber process analysis using a rubber process analyzer, i.e. RPA, according to ASTM D6204, is ≥20 kPa. It is possible to obtain vulcanized rubber and thus a tire having high fracture resistance and high weather resistance from the multiblock copolymer and a rubber composition derived therefrom.