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Pub. No.:    WO/2018/043700    International Application No.:    PCT/JP2017/031561
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Sat Sep 02 01:59:59 CEST 2017
IPC: C08L 21/00
B60C 1/00
C08C 19/25
C08K 3/04
C08K 3/36
C08L 15/00
Applicants: KURARAY CO., LTD.
Inventors: MAEDA Hiromi
前田 裕美
KODA Daisuke
香田 大輔
神原 浩
OHTA Satomi
太田 さとみ
[Problem] To provide: a rubber composition from which a crosslinked product having excellent wear resistance and mechanical strength, such as tensile strength, can be obtained, the state of dispersion of a filler in the crosslinked product obtained from the rubber composition being ideal for improving physical properties; said crosslinked product; and a tire that uses, in a portion thereof, said composition or said crosslinked product, and that is capable of achieving an improvement in rolling resistance and steering stability. [Solution] Disclosed is a rubber composition comprising, per 100 parts by mass of a solid rubber (A): from 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound represented by formula (1); and from 20 to 200 parts by mass of a filler (C). The modified liquid diene rubber (B) satisfies the following (i) to (iii): (i) the weight-average molecular weight (Mw) is from 15,000 to 120,000; (ii) the vinyl content is less than or equal to 70 mol%; and (iii) the average number of functional groups per molecule of the modified liquid diene rubber (B) is from 1 to 30.