Thermoplastically processable polyurethane molding material

A method of manufacturing a thermoplastic polyurethane molding material, comprising:

• mixing in an extruder or kneader at least one first thermoplastic polyurethane defining a component A and at least one second thermoplastic polyurethane defining a component B so as to form a mixture,
• the component A being at least 5 percent by weight of the mixture and being obtained by reacting at least one of a first aliphatic polyol having a molecular weight of 800 to 4000 g/mol and a hydroxyl number of 20 to 235 and being selected from the group consisting of polyadipates, polycaprolactones, polycarbonates, polytetrahydrofurans and corresponding copolymers or mixtures thereof with 1,6-hexamethylene diisocyanate and a first chain-extending agent 1,6-hexanediol in an equivalent ratio of the 1,6-hexamethylene diisocyanate to the polyol of 1.5:1 to 14.0:1, a first NCO index equal to a quotient of an equivalent ratio of isocyanate groups to the sum of the hydroxyl groups of the first aliphatic polyol and the first chain-extending agent, multiplied by a 100, lying within a range of 96 to 105,
• the component B being obtained by reacting at least one second aliphatic polyol having a molecular weight of 800 to 4000 g/mol and a hydroxyl number of 20 to 235 and being selected from the group consisting of polyadipates, polycaprolactones, polycarbonates, polytetrahydrofurans and corresponding copolymers or mixtures thereof with at least one diisocyanate selected from the group consisting of 1,6-hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate and diphenylmethane diisocyanate and a second chain-extending agent selected from the group consisting of 1,4-butanediol, 1,5 pentanediol, 1,4-cyclohexanediol, bis(hydroxymethyl)cyclohexane, bis(hydroxyethyl)hydroquinone, polycaprolactone having a number average molecular weight of 350 to 600 g/mol and polytetrahydrofuran having a number average molecular weight of 200 to 600 g/mol in an equivalent ratio of the diisocyanate to the polyol of 1.5:1 to 14.0:1, a second NCO index equal to a quotient of an equivalent ratio of isocyanate groups to the sum of the hydroxyl groups, multiplied by 100, of the second aliphatic polyol and the second chain-extending agent lying within a range of 96 to 105.

A molded body comprising:

• a mixture of at least one first thermoplastic polyurethane defining a component A and at least one second thermoplastic polyurethane defining a component B,
• the component A being at least 5 percent by weight of the mixture and being obtained by reacting at least one of a first aliphatic polyol having a molecular weight of 800 to 4000 g/mol and a hydroxyl number of 20 to 235 and being selected from the group consisting of polyadipates, polycaprolactones, polycarbonates, polytetrahydrofurans and corresponding copolymers or mixtures thereof with 1,6-hexamethylene diisocyanate and a first chain-extending agent 1,6-hexanediol in an equivalent ratio of the 1,6-hexamethylene diisocyanate to the polyol of 1.5:1 to 14.0:1, a first NCO index equal to a quotient of an equivalent ratio of isocyanate groups to the sum of the hydroxyl groups of the first aliphatic polyol and the first chain-extending agent, multiplied by a 100, lying within a range of 96 to 105,
• the component B being obtained by reacting at least one second aliphatic polyol having a molecular weight of 800 to 4000 g/mol and a hydroxyl number of 20 to 235 and being selected from the group consisting of polyadipates, polycaprolactones, polycarbonates, polytetrahydrofurans and corresponding copolymers or mixtures thereof with at least one diisocyanate selected from the group consisting of 1,6-hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diiusocyanate and diphenylmethane diisocyanate and a second chain-extending agent selected from the group consisting of 1,4-butanediol, 1,5 pentanediol, 1,4-cyclohexanediol, bis(hydroxymethyl)cyclohexane, bis(hydroxyethyl)hydroquinone, polycaprolactone having a number average molecular weight of 350 to 600 g/mol and polytetrahydrofuran having a number average molecular weight of 200 to 600 g/mol in an equivalent ratio of the diisocyanate to the polyol of 1.5:1 to 14.0:1, a second NCO index equal to a quotient of an equivalent ratio of isocyanate groups to the sum of the hydroxyl groups, multiplied by 100, of the second aliphatic polyol and the second chain-extending agent lying within a range of 96 to 105.