Tire
Provided is a tire comprising a tread at least having two layers each comprising a rubber component and a plasticizer, wherein a difference (AE 1 −AE 2 ) between an acetone extraction amount AE 1 of the rubber composition of the first layer and an acetone extraction amount AE 2 of the rubber composition of the second layer is greater than 6.0% by mass, and wherein, with the first layer and the second layer being attached together, when they are applied with a dynamic stimulus under a condition of a dynamic stress of 0.45 MPa, a frequency of 50 Hz, and a temperature at 80° C. for 120 hours, a rate of change in acetone extraction amount of the rubber composition of the first layer before and after being applied with the predetermined dynamic stimulus is −10% or more and 10% or less.
1 . A tire comprising a tread at least having a first layer constituting a tread surface and a second layer adjacent to an inner side of the first layer in a radial direction,
wherein the first layer and the second layer are each composed of a rubber composition comprising a rubber component and a plasticizer,
wherein a difference (AE 1 −AE 2 ) between an acetone extraction amount AE 1 of the rubber composition of the first layer and an acetone extraction amount AE 2 of the rubber composition of the second layer is greater than 6.0% by mass,
wherein, with the first layer and the second layer being attached together, when they are applied with a dynamic stimulus under a condition of a dynamic stress of 0.45 MPa, a frequency of 50 Hz, and a temperature at 80° C. for 120 hours, a rate of change in acetone extraction amount of the rubber composition of the first layer before and after being applied with the dynamic stimulus is −10% or more and 10% or less,
wherein the rubber composition of the first rubber layer comprises natural rubber in an amount of 60% by mass or more based on 100% by mass of the rubber component in the rubber composition of the first rubber layer, and
wherein an acetone extraction amount of the second layer before being applied with the dynamic stimulus is more than 10.0% by mass.
2 . The tire of claim 1 , wherein a tan δ at 30° C. of the rubber composition of the first rubber layer is less than 0.20.
3 . The tire of claim 1 , wherein a tan δ at 30° C. of the rubber composition of the first rubber layer is less than 0.15.
4 . The tire of claim 1 , wherein the plasticizer comprises at least one of oil and an ester-based plasticizer.
5 . The tire of claim 1 , wherein the plasticizer comprises at least one of a resin component and a liquid polymer.
6 . The tire of claim 1 , wherein a difference between a content of the plasticizer in the rubber composition of the first layer and a content of the plasticizer in the rubber composition of the second layer, based on 100 parts by mass of the rubber component, is 10 parts by mass or more.
7 . The tire of claim 1 , wherein a rate of change in complex elastic modulus at 0° C. (0° C. E*) of the rubber composition of the first layer before and after being applied with the dynamic stimulus is greater than −20% and less than 20%.
8 . The tire of claim 1 , wherein a rate of change in tan δ at 0° C. (0° C. tan δ) of the rubber composition of the first layer before and after being applied with the dynamic stimulus is greater than −20% and less than 20%.
9 . The tire of claim 1 , wherein 0° C. E* of the rubber composition of the first layer is 4.0 MPa or more.
10 . The tire of claim 1 , wherein 0° C. tan δ of the rubber composition of the first layer is 0.10 or more.
11 . The tire of claim 1 , wherein a glass transition temperature of the rubber composition of the first layer is −40° C. or higher.
12 . The tire of claim 1 , wherein an elongation at break of the rubber composition of the first layer measured according to JIS K 6251: 2017 is 200% or more.