Provided are a rubber composition for sidewalls which provides improved low heat build-up properties, and a pneumatic tire including the rubber composition. Included is a rubber composition for sidewalls containing: a rubber component including 30% by mass or more of an isoprene-based rubber; carbon black; a polyether having an average mass content of at least two consecutive ethylene oxide units of 30% by mass or more based on the total ethylene oxide mass content of the polyether; and a C4 or higher aliphatic carboxylic acid zinc salt and/or an aromatic carboxylic acid zinc salt, the rubber composition containing, per 100 parts by mass of the rubber component, 20 parts by mass or more of the carbon black, the carbon black including 50% by mass or more of a carbon black (1) having a CTAB specific surface area of 100 m2/g or less, the rubber composition containing, per 100 parts by mass of the rubber component, 20 parts by mass or less of the polyether, a total of 20 parts by mass or less of the aliphatic carboxylic acid zinc salt and/or aromatic carboxylic acid zinc salt, and no or not more than 10 parts by mass of zinc oxide.
RUBBER COMPOSITION FOR SIDEWALL, AND PNEUMATIC TIRE
KAUTSCHUKZUSAMMENSETZUNG FÜR SEITENWAND UND LUFTREIFEN
COMPOSITION DE CAOUTCHOUC POUR FLANC, ET PNEUMATIQUE
2020-11-11
Patent
Electronic Resource
English
IPC: | C08L COMPOSITIONS OF MACROMOLECULAR COMPOUNDS , Massen auf Basis makromolekularer Verbindungen / B60C VEHICLE TYRES , Fahrzeugreifen / C08K Verwendung von anorganischen oder nichtmakromolekularen organischen Stoffen als Zusatzstoffe , USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS |