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1. (WO2017195675) RUBBER COMPOSITION AND PNEUMATIC TIRE USING SAME

Pub. No.:    WO/2017/195675    International Application No.:    PCT/JP2017/017051
Publication Date: Fri Nov 17 00:59:59 CET 2017 International Filing Date: Sat Apr 29 01:59:59 CEST 2017
IPC: C08L 9/06
B60C 1/00
C08K 3/04
C08K 3/36
Applicants: THE YOKOHAMA RUBBER CO., LTD.
横浜ゴム株式会社
Inventors: SEKINE Yuko
関根 優子
ASHIURA Makoto
芦浦 誠
YATSUYANAGI Fumito
八柳 史
Title: RUBBER COMPOSITION AND PNEUMATIC TIRE USING SAME
Abstract:
Provided is a rubber composition with lower heat build-up compared to previous levels, while maintaining wear resistance. The rubber composition contains a reinforcing filler and a diene rubber. The diene rubber includes a styrene-butadiene copolymer component comprising at least one styrene-butadiene copolymer, and satisfying the following requirements: (1) bound styrene content is 5-50% by weight, (2) of the components obtained by ozonolysis, among a total of 100 mol.% of decomposition components including 1,2-conjugated butadiene-derived units and/or styrene-derived units, decomposition component V1 which contains one 1,2-conjugated butadiene-derived unit accounts for at least 25 mol.%, (3) of the components obtained by ozonolysis, among a total of 100 mol.% of decomposition components including 1,2-conjugated butadiene-derived units and styrene-derived units, decomposition component S2V1 which includes two styrene-derived units, and one 1,2-conjugated butadiene-derived unit accounts for at least 5 mol.%, and (4) the vinyl content of the butadiene moiety is at least 50%.