Thermoplastic polyurethane resin elastomers

A thermoplastic polyurethane resin elastomer obtained by mixing at least an isocyanate compound (I), an aliphatic alcohol (II) which is at least one aliphatic alcohol selected from the group consisting of ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol and 1,6-hexanediol, and a polyol (III) having a number average molecular weight determined from the hydroxyl value of not less than 300 and not more than 10,000, so that the isocyanate compound (I), the aliphatic alcohol (II), and the polyol (III) are reacted, wherein

• the isocyanate compound (I) comprises an alicyclic isocyanate compound containing two isocyanate groups, and optionally an aliphatic isocyanate compound containing two isocyanate groups, a total amount of the alicyclic isocyanate compound and the aliphatic isocyanate compound being not less than 90 mol % in the isocyanate compound (I), and an amount of the alicyclic isocyanate compound containing two isocyanate groups being not less than 80 mol %,
• the polyol (III) comprises not less than 80 mol % of a copolymerized polycarbonate diol (IIIA) including a linear repeating structural unit represented by the formula (A) and a repeating structural unit represented by the formula (B),
• the equivalent ratio represented by hydroxyl equivalent (EIII) of polyol (III):
• isocyanate equivalent (EI) of isocyanate compound (I):hydroxyl equivalent (EII) of aliphatic alcohol (II) is 1.0:2.0-5.5:1.0-4.5, with the proviso that 0.95≤(EI)/((EII)+ (EIII))≤1.05,
• the number average molecular weight determined from the hydroxyl value of the copolymerized polycarbonate diol (IIIA) is not less than 500 and not more than 5,000,
• wherein in the formula (A), R1 independently represents n-propane, n-butane, or n-pentane, and in the formula (B), R2 independently represents a C6-C20 hydrocarbon group, and
• the content of a biomass resource in the thermoplastic polyurethane resin elastomer is not less than 10 mass %.

A method for producing a thermoplastic polyurethane resin elastomer comprising mixing at least an isocyanate compound (I), an aliphatic alcohol (II) which is at least one aliphatic alcohol selected from the group consisting of ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol and 1,6-hexanediol, and a polyol (III) having a number average molecular weight determined from the hydroxyl value of not less than 300 and not more than 10,000, so that the isocyanate compound (I), the aliphatic alcohol (II), and the polyol (III) are reacted, wherein

• the isocyanate compound (I) comprises an alicyclic isocyanate compound containing two isocyanate groups, and optionally an aliphatic isocyanate compound containing two isocyanate groups, a total amount of the alicyclic isocyanate compound and the aliphatic isocyanate compound being not less than 90 mol % in the isocyanate compound (I), and an amount of the alicyclic isocyanate compound containing two isocyanate groups being not less than 80 mol %,
• the polyol (III) comprises not less than 80 mol % of a copolymerized polycarbonate diol (IIIA) including a linear repeating structural unit represented by the formula (A) and a repeating structural unit represented by the formula (B), and
• the equivalent ratio represented by hydroxyl equivalent (EIII) of polyol (III):isocyanate equivalent (EI) of isocyanate compound (I):hydroxyl equivalent (EII) of aliphatic alcohol (II) is 1.0:2.0-5.5:1.0-4.5, with the proviso that 0.95≤(EI)/((EII)+(EIII))≤1.05,
• wherein in the formula (A), R1 independently represents n-propane, n-butane, or n-pentane, and in the formula (B), R2 independently represents a C6-C20 hydrocarbon group.