To provide a rubber-like block copolymer that ensures excellent tensile elongation and tensile strength when forming a rubber composition, achieves high wear resistance, and prevents a user from feeling heavy fatigue in evaluation of a tire with a real car using the rubber composition.SOLUTION: A rubber-like block copolymer contains: 5 mass% or more and 95 mass% or less of a polymer block (a) having a content of a vinyl aromatic monomer unit of 22 mass% or less; and 5 mass% or more and 95 mass% or less of a polymer block (b) having a content of a vinyl aromatic monomer unit of 23 mass% or more and less than 50 mass%, in which the rubber-like block copolymer has an iodine value of 10 to 250, an ethylene structure of 3 mass% or more, and a vinyl aromatic monomer block of less than 10 mass%.SELECTED DRAWING: None
【課題】ゴム組成物を形成したときに引張伸び及び引張強度に優れ、耐摩耗性が高く、ゴム組成物を用いたタイヤの実車運転評価で使用者の疲労感が大きくなり難いゴム状ブロック共重合体を得る。【解決手段】ビニル芳香族単量体単位の含有量が22質量%以下の重合体ブロック(a)を5質量%以上95質量%以下と、ビニル芳香族単量体単位の含有量が23質量%以上50質量%未満の重合体ブロック(b)を5質量%以上95質量%以下と、を、含有し、ヨウ素価が10~250であり、エチレン構造≧3質量%であり、ビニル芳香族単量体ブロック<10質量%である、ゴム状ブロック共重合体。【選択図】なし
RUBBER-LIKE BLOCK COPOLYMER, RUBBER COMPOSITION, AND MOLDED BODY
ゴム状ブロック共重合体、ゴム組成物、及び成形体
2022-01-18
Patent
Electronic Resource
Japanese
IPC: | C08F MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS , Makromolekulare Verbindungen, erhalten durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind / B60C VEHICLE TYRES , Fahrzeugreifen / C08K Verwendung von anorganischen oder nichtmakromolekularen organischen Stoffen als Zusatzstoffe , USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS / C08L COMPOSITIONS OF MACROMOLECULAR COMPOUNDS , Massen auf Basis makromolekularer Verbindungen |
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