Tire
An object of the present disclosure is to provide a highly durable tire using a resin composition, and a solution to the problem is a tire obtained by using a resin composition containing a polyamide resin and an elastomer having a glass transition temperature of 25° C. or less, wherein the melt viscosity ν (Pa·sec) at 240° C. and the average distance between elastomer interfaces, τ (μm), satisfy the relationship of the following expression (1): ν<34.369τ −3.525 (1).
1. A tire obtained by using a resin composition, the resin composition comprising:
a polyamide resin; and
an elastomer having a glass transition temperature of 25° C. or less,
wherein a melt viscosity ν (Pa·sec) at 240° C. of the resin composition and an average distance between elastomer interfaces, τ (μm), satisfy the relationship of the following expression (1):
ν<34.369τ −3.525 (1),
60 to 90% by mass of the polyamide resin is polyamide 610 having a melt flow rate (MFR) under a load of 2.16 kg at 240° C. of 50 g/10 min or less, and
10 to 40% by mass of the polyamide resin is polyamide 610 having a melt flow rate (MFR) under a load of 2.16 kg at 240° C. of 60 g/10 min or more.
2. The tire according to claim 1 ,
wherein the polyamide resin is a polyamide resin formed by polymerizing an aliphatic diamine having 6 to 20 carbon atoms and an aliphatic dicarboxylic acid having 10 to 20 carbon atoms.
3. The tire according to claim 1 ,
wherein the elastomer includes at least one selected from the group consisting of polyethylene, polypropylene, ethylene-propylene rubber, ethylene-1-butene copolymer, poly α-olefin, acrylic rubber, and styrene-ethylene-butylene-styrene copolymer.
4. The tire according to claim 1 ,
wherein maleic anhydride is copolymerized with or grafted onto at least a portion of the elastomer.
5. The tire according to claim 1 ,
wherein an epoxy-terminated acrylic acid ester is copolymerized with or grafted onto at least a portion of the elastomer.
6. The tire according to claim 1 ,
wherein the resin composition includes 60 to 90% by mass of the polyamide resin.
7. The tire according to claim 1 ,
wherein 10 to 50% by mass of the elastomer is a modified elastomer and 90 to 50% by mass of the elastomer is an unmodified elastomer.
8. The tire according to claim 1 ,
wherein the resin composition further comprises 1 to 20% by mass of a plasticizer.
9. The tire according to claim 8 ,
wherein the plasticizer includes at least one selected from the group consisting of N-butylbenzenesulfonamide, 2-ethylhexyl-4-hydroxybenzoate, and N-(2-hydroxypropyl)benzenesulfonamide.
10. The tire according to claim 1 ,
wherein the elastomer has a melt flow rate (MFR) under a load of 2.16 kg at 230° C. of 15 g/10 min or more.
11. The tire according to claim 1 , which is a non-pneumatic tire comprising:
a wheel portion to be attached to an axle;
an inner cylinder externally covering the wheel portion;
an outer cylinder surrounding the inner cylinder from an outside in a tire radial direction;
a plurality of connecting members arranged along a tire circumferential direction between the inner cylinder and the outer cylinder and connecting the inner cylinder and the outer cylinder to each other; and
a tread member provided outside the outer cylinder in the tire radial direction,
wherein the inner cylinder, the outer cylinder, and the connecting members are formed of the resin composition.
12. The tire according to claim 2 ,
wherein the elastomer includes at least one selected from the group consisting of polyethylene, polypropylene, ethylene-propylene rubber, ethylene-1-butene copolymer, poly α-olefin, acrylic rubber, and styrene-ethylene-butylene-styrene copolymer.
13. The tire according to claim 2 ,
wherein maleic anhydride is copolymerized with or grafted onto at least a portion of the elastomer.
14. The tire according to claim 2 ,
wherein an epoxy-terminated acrylic acid ester is copolymerized with or grafted onto at least a portion of the elastomer.
15. The tire according to claim 2 ,
wherein the resin composition includes 60 to 90% by mass of the polyamide resin.
16. The tire according to claim 2 ,
wherein 10 to 50% by mass of the elastomer is a modified elastomer and 90 to 50% by mass of the elastomer is an unmodified elastomer.
17. The tire according to claim 2 ,
wherein the resin composition further comprises 1 to 20% by mass of a plasticizer.
18. The tire according to claim 2 ,
wherein the elastomer has a melt flow rate (MFR) under a load of 2.16 kg at 230° C. of 15 g/10 min or more.