| 摘要 |
[Problem] To provide a rubber composition having excellent filler dispersability, a crosslinked product having excellent wear resistance and other properties, and a tire using said composition or said crosslinked product in a portion thereof and enabling improved rolling resistance performance, as well as improved steering stability and improved ice grip performance. [Solution] A rubber composition containing, with respect to 100 parts by mass of a solid rubber (A): 0.1-10 parts by mass of a modified liquid diene rubber (B) obtained by adding a modified compound to a native liquid diene rubber (B') and having a functional group derived from said modified compound; and 20-150 parts by mass of a filler (C). The modified liquid diene rubber (B) satisfies the following (i)-(iv): (i) isoprene units are included in the amount of 50 mass% or more with respect to the total monomer units; (ii) the weight-average molecular weight (Mw) is 25,000-120,000; (iii) the modified compound is added in the amount of 3-40 parts by mass with respect to 100 parts by mass of the native liquid diene rubber (B'); and (iv) the average number of functional groups per molecule of the modified liquid diene rubber (B) is 15-80 groups. |
