TIRE

Japanese Patent JP2023096737

A

To provide a tire capable of maintaining wet grip performance even after the tire has worn out.SOLUTION: A tire has a tread including at least a first layer forming a tread surface and a second layer adjacent to the radial direction inner side of the first layer. The first layer and the second layer are each formed of a rubber composition containing a rubber component and plasticizers. A rubber composition composing the rubber composition forming the first layer contains 3.0 pts.mass or more of a plasticizer A, 1.0 pts.mass or more of a plasticizer B, and 1.0 pts.mass or more of a plasticizer C, based on 100 pts.mass of the rubber component. The plasticizer A has a glass transition point of - 40°C or lower and a weight-average molecular weight of less than 1000. The plasticizer B has a glass transition point of 30°C or higher. The plasticizer C has a glass transition point of higher than - 70°C and lower than 30°C, and a weight-average molecular weight of 1000 or more. The content of the plasticizer A based on 100 pts.mass of the rubber component in the rubber composition forming the second layer is more than the content of the plasticizer A based on 100 pts.mass of the rubber component in the rubber composition forming the first layer. A difference (AE2-AE1) between an amount AE2 of acetone extract from the rubber composition forming the second layer and an amount AE1 of acetone extract from the rubber composition forming the first layer is 3.0 mass% or more.SELECTED DRAWING: None

WASHIZU KENSUKE

JP2021212680A

July 07, 2023

December 27, 2021

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SUMITOMO RUBBER IND

B60C1/00; B60C11/00; C08F212/08; C08F236/06; C08L21/00; C08L91/00

Patent Attorney Corporation Asahina Patent Office

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