Aliphatic sinterable thermoplastic polyurethanes and use thereof

A light-resistant, sinterable, aliphatic, thermoplastic polyurethane comprising the reaction product of:

• a) an isocyanate component consisting of:
• a1) from 75 mol % to 100 mol % of 1,6-hexamethylene diisocyanate,
• and
• a2) from 0 mol % to 25 mol % of a (cyclo)aliphatic diisocyanate or of a mixture of (cyclo)aliphatic diisocyanates, with the proviso that said aliphatic diisocyanates do not include 1,6-hexamethylene diisocyanate,
• wherein the sum of a1) and a2) totals 100 mol % of a);
• with
• b) a chain-extending component consisting of:
• b1) from 75 mol % to 100 mol % of a chain-extender selected from the group consisting of:
• 1,2-ethanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,10-decanediol, 1,12-dodecanediol, diethylene glycol, dipropylene glycol, terephthalic acid bis(ethylene glycol), terephthalic acid bis(1,4-butanediol), 1,4-di(β-hydroxyethyl)hydroquinone and 1,4-di(β-hydroxyethyl)bisphenol A,
• and
• b2) from 0 mol % to 25 mol % of a chain-extender having a molecular weight from 60 to 400 or a mixture thereof,
• with the proviso that chain-extender b2) is different than chain-extender b1), and the sum of b1) and b2) totals 100 mol % of b);
• wherein the arithmetic sum of the percentages of a2) and b2) totals from 2 mol % to 28 mol %;
• and
• c) at least one component having a number-average molecular weight of from 450 g/mol to 10,000 g/mol and, on average, at least 1.8 to at most 3.0 Zerewitinoff-active hydrogen atoms,
• wherein the ratio of the isocyanate groups of a) to the groups of b), c) and optionally h) that are reactive with isocyanate ranges from 0.9:1 to 1.1:1;
• in the presence of
• d) from 1 wt. % to 30 wt. %, based on 100 wt. % of the thermoplastic polyurethane, of one or more plasticizers having a number-average molecular weight from 200 g/mol to 10,000 g/mol,
• e) optionally one or more catalysts,
• f) from 0.1 wt. % to 10 wt. %, based on 100 wt. % of the thermoplastic polyurethane, of one or more light stabilizers,
• g) optionally, one or more additives and/or auxiliary substances,
• and
• h) optionally, one or more chain-terminators.