A pneumatic tire includes a cap tread portion, an undertread portion, and a belt cover layer from outside to inside in the tire radial direction, a rubber composition for an undertread forming the undertread portion includes from 40 to 80 parts by mass of silica blended in 100 parts by mass of diene rubber containing 70 mass % or greater of natural rubber and/or isoprene rubber, and includes a silane coupling agent blended by an amount from 2 to 15 mass % with respect to the silica, a ratio (SUT/MUT) of tensile strength at break (SUT) to 300% deformation tensile stress (MUT) of the rubber composition for an undertread is 1.80 or greater, and an absolute value |MUT-MBC| of difference between the 300% deformation tensile stress (MUT) and 300% deformation tensile stress (MBC) of a rubber composition for a belt cover forming the belt cover layer is 3.0 MPa or less.
PNEUMATIC TIRE AND METHOD FOR MANUFACTURING RUBBER COMPOSITION FOR TIRE USED FOR SAME
22.10.2020
Patent
Elektronische Ressource
Englisch
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