TIRE INNER LINER AND PNEUMATIC TIRE
Provided is a tire inner liner capable of reducing rolling resistance during tire driving. The present invention provides a tire inner liner that consists of a material containing a thermoplastic elastomer composition consisting of a thermoplastic resin or a thermoplastic-resin component and an elastomer component, the tire inner liner being characterized in that the ratio of the dynamic storage modulus of the material at 60° C. with respect to the dynamic storage modulus of the material at 0° C. is 0.01-0.3.
1 . A tire inner liner comprising a material comprising a thermoplastic resin or a thermoplastic elastomer composition containing a thermoplastic resin component and an elastomer component, wherein the ratio of the dynamic storage elastic modulus at 60° C. to the dynamic storage elastic modulus at 0° C. of the material is 0.01 to 0.3.
2 . The tire inner liner according to claim 1 , wherein the dynamic storage elastic modulus E′(30° C.) at 30° C. and the dynamic storage elastic modulus E′(60° C.) at 60° C. of the material satisfy expression (1):
(log 10 E ′(60° C.)−log 10 E ′(30° C.))/(60−30)<−0.015 (1).
3 . The tire inner liner according to claim 1 , wherein the thermoplastic resin or the thermoplastic resin component is a modified ethylene-vinyl alcohol copolymer.
4 . The tire inner liner according to claim 3 , wherein the modified ethylene-vinyl alcohol copolymer is a polyester-modified ethylene-vinyl alcohol copolymer.
5 . The tire inner liner according to claim 1 , wherein the thermoplastic elastomer composition has a continuous phase and a dispersion phase, the thermoplastic resin component forms a continuous phase, and the elastomer component forms a dispersion phase.
6 . The tire inner liner according to claim 3 , wherein the material further comprises a second thermoplastic resin or thermoplastic elastomer having an elastic modulus at 23° C. higher than the elastic modulus at 23° C. of the modified ethylene-vinyl alcohol copolymer and having a melting point of 170° C. or more.
7 . The tire inner liner according to claim 6 , wherein the second thermoplastic resin or thermoplastic elastomer is a polyester resin or a polyester elastomer.
8 . A pneumatic tire comprising the tire inner liner according to claim 1 .
9 . The tire inner liner according to claim 2 , wherein the thermoplastic resin or the thermoplastic resin component is a modified ethylene-vinyl alcohol copolymer.
10 . The tire inner liner according to claim 2 , wherein the thermoplastic elastomer composition has a continuous phase and a dispersion phase, the thermoplastic resin component forms a continuous phase, and the elastomer component forms a dispersion phase.
11 . The tire inner liner according to claim 3 , wherein the thermoplastic elastomer composition has a continuous phase and a dispersion phase, the thermoplastic resin component forms a continuous phase, and the elastomer component forms a dispersion phase.
12 . The tire inner liner according to claim 4 , wherein the thermoplastic elastomer composition has a continuous phase and a dispersion phase, the thermoplastic resin component forms a continuous phase, and the elastomer component forms a dispersion phase.
13 . The tire inner liner according to claim 4 , wherein the material further comprises a second thermoplastic resin or thermoplastic elastomer having an elastic modulus at 23° C. higher than the elastic modulus at 23° C. of the modified ethylene-vinyl alcohol copolymer and having a melting point of 170° C. or more.
14 . The tire inner liner according to claim 5 , wherein the material further comprises a second thermoplastic resin or thermoplastic elastomer having an elastic modulus at 23° C. higher than the elastic modulus at 23° C. of the modified ethylene-vinyl alcohol copolymer and having a melting point of 170° C. or more.
15 . A pneumatic tire comprising the tire inner liner according to claim 2 .
16 . A pneumatic tire comprising the tire inner liner according to claim 3 .
17 . A pneumatic tire comprising the tire inner liner according to claim 4 .
18 . A pneumatic tire comprising the tire inner liner according to claim 5 .
19 . A pneumatic tire comprising the tire inner liner according to claim 6 .
20 . A pneumatic tire comprising the tire inner liner according to claim 7 .