公开(公告)号：US4918142A

公开(公告)日：1990-04-17

申请号：US320836

申请日：1989-03-08

Applicant: Yuichi Saito ,  Takuzoh Yabuta ,  Hiroyoshi Takao ,  Akio Imai ,  Mitsuji Tsuji

Inventor： Yuichi Saito ,  Takuzoh Yabuta ,  Hiroyoshi Takao ,  Akio Imai ,  Mitsuji Tsuji

IPC: B29D30/52 ,  B60C1/00 ,  C08F297/04 ,  C08L21/00 ,  C08L53/00 ,  C08L53/02

CPC classification number: C08L21/00 ,  B60C1/0016 ,  C08F297/044 ,  C08L53/02 ,  C08L9/06

Abstract: A rubber composition suitable for tire treads having well-balanced excellent steering stability in cornering, wet skid characteristic, ice skid characteristic and rolling characteristic, and an excellent processability, which comprises a rubber component containing a block copolymer consisting essentially of a block A and a block B, obtained by conducting polymerization of an aromatic vinyl compound and a conjugated diene compound in a hydrocarbon solvent in the presence of an organolithium initiator and modifying with a coupling agent, and satisfying the following conditions (A) to (E);(A) the block A having a content of an aromatic vinyl compound of 5 to 29% by weight and a content of 1,2-bonds in the conjugated diene component of 25 to 55% by weight,(B) the block B having a content of an aromatic vinyl compound of 35 to 60% by weight and a content of 1,2-bonds in the conjugated diene component of 20 to 70% by weight,(C) the content of the block A in the block copolymer being from 20 to 80% by weight,(D) the average content of the aromatic vinyl compound in the block copolymer being from 20 to 40% by weight and the average content of 1,2-bonds in the conjugated diene component of the block copolymer being from 20 to 60% by weight, and(E) at least 40% by weight of the polymer chains of the block copolymer being a branched polymer formed by modification with a trifunctional or tetrafunctional coupling agent.

Abstract translation: 一种适用于轮胎胎面的橡胶组合物，其具有平衡优异的转弯转向稳定性，防滑特性，防滑特性和滚动特性以及优异的加工性能，其包括含有基本上由块A和 嵌段B，其通过在有机锂引发剂的存在下在烃溶剂中进行芳族乙烯基化合物和共轭二烯化合物的聚合而获得，并且用偶联剂进行改性，并满足以下条件（A）至（E）; （A）具有5〜29重量％的芳族乙烯基化合物的含量和共轭二烯组分中的1,2-键含量为25〜55重量％的嵌段A，（B）嵌段B具有 35〜60重量％的芳香族乙烯基化合物的含量和共轭二烯成分中的1,2-键含量为20〜70重量％，（C）嵌段共聚物中嵌段A的含量为 20〜80重量％，（D）嵌段共聚物中芳族乙烯基化合物的平均含量为20〜40重量％，嵌段共聚物的共轭二烯成分中的1,2-键的平均含量 为20〜60重量％，（E）嵌段共聚物的聚合物链的至少40重量％为通过三官能或四官能偶合剂改性形成的支链聚合物。