Tire
A tire includes a round tire frame made of a resin material, and the resin material includes a thermoplastic polyamide-based elastomer including an ester bond within a molecule thereof. The thermoplastic polyamide-based elastomer has a ratio by mass (HS/SS) of hard segment (HS) to soft segment (SS) of from 54/46 to 90/10.
1. A tire comprising a round tire frame made of a resin material, the resin material including a thermoplastic polyamide-based elastomer including an ester bond within a molecule thereof, and the thermoplastic polyamide-based elastomer including a hard segment and a soft segment, and having a ratio by mass (HS/SS) of the hard segment (HS) to the soft segment (SS) of from 54/46 to 88/12,
the hard segment (HS) including a polyamide 12 represented by —[CO—(CH 2 ) 11 —NH],
the soft segment (SS) being formed from a diol compound having a hydroxyl group at both terminals thereof,
wherein a chain extender, which is a dicarboxylic acid selected from the group consisting of adipic acid and decanedicarboxylic acid, connects the hard segment and the soft segment, and
the ester bond is formed between a hydroxyl group of the diol compound and a carboxyl group of the dicarboxylic acid.
2. The tire according to claim 1 , wherein the diol compound comprises polytetramethylene ether glycol.
3. The tire according to claim 2 , wherein the dicarboxylic acid is decanedicarboxylic acid.
4. The tire according to claim 1 , wherein the polyamide 12 is a polyamide obtained by ring-opening polycondensation of lauryllactam or a polyamide obtained by polycondensation of 12-aminododecanoic acid.
5. The tire according to claim 1 , wherein the diol compound is an ABA-type triblock polyether diol represented by Formula (3):
wherein, in Formula (3), each of x and z independently represents an integer from 1 to 20, and y represents an integer from 4 to 50.
6. The tire according to claim 1 , wherein the dicarboxylic acid is decanedicarboxylic acid.