MULTIBLOCK COPOLYMER, RUBBER COMPOSITION, AND TIRE

摘要

The purpose of the present invention is to provide: a multiblock copolymer which enables the production of a vulcanized rubber having excellent fracture resistance and cracking resistance; a rubber composition; and a tire having excellent fracture resistance and cracking resistance. A multiblock copolymer produced by copolymerizing a conjugated diene compound with a non-conjugated olefin, wherein the structure of the multiblock copolymer is either one of A-(B-A)x and B-(A-B)x (wherein A represents a block moiety composed of a monomer unit of the non-conjugated olefin; B represents a block moiety composed of a monomer unit of the conjugated diene compound; and x represents an integer of 1 or greater), the content of the non-conjugated olefin moiety is 50 mol% or less, the degree of crystallinity of the non-conjugated olefin moiety is more than 0 mol% and 20 mol% or less, and the degree of crystallinity of the non-conjugated olefin moiety is more than 0% and 40% or less; a rubber composition produced using the multiblock copolymer; and a tire.