To provide a conjugated diene polymer composition excellent in rolling resistance, grip performance on a wet road surface, and in wear resistance when formed into a tire.SOLUTION: The conjugated diene polymer contains 10 to 90 pts.mass of a conjugated diene polymer (A) having a glass transition temperature of -20°C or higher and 10 to 90 pts.mass of conjugated diene polymer (B) having a glass transition temperature of - 25°C or lower, in which the conjugated diene polymer (A) has an absolute molecular weight due to a GPC-light scattering measurement method with a viscosity detector is 40×104 or larger and 5000×104 or smaller and the degree of branching (Bn) due to the GPC-light scattering measurement method with a viscosity detector is 8 or larger.SELECTED DRAWING: None
【課題】タイヤにした場合の転がり抵抗性、湿潤路面でのグリップ性能、及び耐摩耗性に優れた共役ジエン系重合体組成物を提供する。【解決手段】ガラス転移温度が−20℃以上の共役ジエン系重合体(A)10〜90質量部と、ガラス転移温度が−25℃以下の共役ジエン系重合体(B)10〜90質量部と、を、含有し、前記共役ジエン系重合体(A)は、粘度検出器付きGPC−光散乱法測定法による絶対分子量が40×104以上5000×104以下であり、前記粘度検出器付きGPC−光散乱法測定法による分岐度(Bn)が8以上である、共役ジエン系重合体組成物。【選択図】なし
CONJUGATED DIENE POLYMER COMPOSITION AND TIRE
共役ジエン系重合体組成物、及びタイヤ
2021-09-24
Patent
Electronic Resource
Japanese
IPC: | C08C TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS , Behandlung oder chemische Modifizierung von Kautschuken / B60C VEHICLE TYRES , Fahrzeugreifen / 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 / C08L COMPOSITIONS OF MACROMOLECULAR COMPOUNDS , Massen auf Basis makromolekularer Verbindungen |
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