| 摘要 |
<p>An oil-extended rubber comprising 100 parts by weight of a rubber ingredient comprising a conjugated diene rubber in which the ratio of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn), (Mw/Mn), is 1.2 to 2.2 and the conjugated diene monomer units have a vinyl bond unit content of 20% or higher and 5 to 100 parts by weight of a process oil having a total acid value of 1.0 mg-KOH/g or higher, a pour point of 50°C or lower, and an aromatic-carbon content of 20% or higher; and a rubber composition comprising 100 parts by weight of the rubber ingredient, 5 to 100 parts by weight of the process oil, and 10 to 200 parts by weight of a reinforcement. This rubber composition gives a crosslinked object which is excellent in tensile strength and wearing resistance, is reduced in heat buildup, and is useful as an automotive tire material, etc.</p> |
