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AssigneeThe Yokohama Rubber Co., Ltd.
InventorKento TAKAHASHI
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A rubber composition is prepared by mixing a specific hydrazide compound at a ratio of 0.5 to 3.0 parts by mass, zinc oxide at a ratio of 1 to 5 parts by mass, and carbon black having N2SA of 60 to 150 m2/g at a ratio of 30 to 60 parts by mass per 100 parts by mass of diene rubber containing 80 parts by mass or more of natural rubber. The rubber composition is prepared through (a) mixing the hydrazide compound and the carbon black to obtain a mixture, and (b) mixing the zinc oxide with the mixture obtained in step (a) to obtain a mixture. A maximum ultimate temperature during the mixture in step (a) is from 140 to 170° C. A storage modulus and elongation at break have a specific relationship.
A rubber composition prepared by mixing a hydrazide compound represented by the following Formula (1) at a ratio of 0.5 to 3.0 parts by mass, zinc oxide at a ratio of 1 to 5 parts by mass, and carbon black having a nitrogen adsorption specific surface area (N2SA) of 60 to 150 m2/g at a ratio of 30 to 60 parts by mass per 100 parts by mass of diene rubber containing 80 parts by mass or more of natural rubber and/or synthetic isoprene rubber, the rubber composition being prepared through (a) mixing at least the hydrazide compound and the carbon black to obtain a mixture, and (b) mixing the zinc oxide with the mixture obtained in step (a) to obtain a mixture,
A method for preparing a rubber composition that mixes a hydrazide compound represented by the following Formula (1) at a ratio of 0.5 to 3.0 parts by mass, zinc oxide at a ratio of 1 to 5 parts by mass, and carbon black having a nitrogen adsorption specific surface area (N2SA) of 60 to 150 m2/g at a ratio of 30 to 60 parts by mass per 100 parts by mass of diene rubber containing 80 parts by mass or more of natural rubber and/or synthetic isoprene rubber,
Dependencies are inferred from the claim text.