Thermoplastic polyurethanes and their use

1. A thermoplastic polyurethane, obtained from components comprising

a) at least one organic diisocyanate,

b) at least one low molecular polyol having an average of from 1.8 to 3 Zerewitinoff-active hydrogen atoms and having a number average molecular weight M n of from 60 to 400 g/mol, and

c) at least one further polyol having an average of from 1.8 to 3 Zerewitinoff-active hydrogen atoms and having a number average molecular weight M n of from 450 to 10,000 g/mol,

e) optionally a catalyst,

f) optionally additives and/or auxiliary materials, and/or

g) optionally chain breakers,

wherein the ratio of isocyanate groups in component a) to isocyanate reactive groups, in components b), c) and, if present, g) is from 0.9:1 to 1.1:1, and

wherein the thermoplastic polyurethane comprises

d) from 0.4 to 10% by weight, based on the thermoplastic polyurethane, of a mixture which comprises

d1) from 0.1 to 4% by weight, based on the thermoplastic polyurethane, of at least one amorphous and/or crystalline silicon dioxide, and

a polyorganosiloxane mixture of the formula (R 2 SiO) n , wherein R 2 represents an organic hydrocarbon residue which may be made linear and/or branched, and has 1 to 27 carbon atoms, and n represents an integer from 3 to 8,000, wherein the polyorganosiloxane mixture consists of

d2) 0 to 2% by weight, based on the thermoplastic polyurethane, of at least one polyorganosiloxanes of the formula (R 2 SiO) n , wherein n is from 3 to 300 and

d3) 0.2 to 8% by weight, based on the thermoplastic polyurethane, of at least one polyorganosiloxanes of the formula (R 2 SiO) n wherein n is from 1,000 to 8,000.

2. A moulded part or skin comprising the thermoplastic polyurethane according to claim 1 .

3. A method comprising injection moulding at least the thermoplastic polyurethane according to claim 1 .

4. A method comprising extruding at least the thermoplastic polyurethane according to claim 1 .

5. A method comprising subjecting at least the thermoplastic polyurethane according to claim 1 to a powder slush process.

6. A method comprising fitting out the inside of a motor vehicle with a material which comprises the thermoplastic polyurethane according to claim 1 .

7. The thermoplastic polyurethane of claim 1 , wherein the organic diisocyanate is 1,6-hexamethylene diisocyanate, 1,4-cyclohexane diisocyanate, iso-phorone diisocyanate, dicyclohexylmethane diisocyanate, diphenylmethane diisocyanate isomer mixtures with a 4,4′-diphenylmethane diisocyanate content of more than 96% by weight, 4,4′-diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, or mixtures thereof.

8. The thermoplastic polyurethane of claim 1 , wherein the low molecular polyol is ethanediol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 2,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,10-decanediol, 1,12-dodecanediol, diethylene glycol, dipropylene glycol, 1,4-cyclohexanediol, 1,4-dimethanol cyclohexane, neopentyl glycol, or mixtures thereof.

9. The thermoplastic polyurethane of claim 7 , wherein the low molecular polyol is ethanediol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 2.3-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,10-decanediol, 1,12-dodecanediol, diethylene glycol, dipropylene glycol, 1,4-cyclohexanediol, 1,4-dimethanol cyclohexane, neopentyl glycol, or mixtures thereof.

10. The thermoplastic polyurethane of claim 1 , wherein the polyol c) is polyester diol, polyether diol, polycarbonate diol, or mixtures thereof.

11. The thermoplastic polyurethane of claim 9 , wherein the polyol c) is polyester diol, polyether diol, polycarbonate diol, or mixtures thereof.

12. The thermoplastic polyurethane of claim 1 , wherein the catalyst e) is required and is titanic acid ester, iron compound, tin compound, zircon compound, bismuth compound, or mixtures thereof.

13. The thermoplastic polyurethane of claim 1 , wherein the additives and/or auxiliary materials f) are required and are fatty acid ester, metal soap from fatty acid ester, fatty acid amide, fatty acid ester amide, anti-blocking agent, flame protection agent, softener, or mixtures thereof.

14. The thermoplastic polyurethane of claim 1 , wherein the chain breaker g) is required and is butyl, dibutylamine, octylamine, stearylamine, N-methyl-stearylimine, pyrrolidine, piperidine, cyclohexylamine, butanol, 2-ethylhexanol, octanol, dodecanol, stearyl alcohol, amyl alcohol, cyclohexanol, ethylene glycol monomethyl ether or mixtures thereof.

15. The thermoplastic polyurethane of claim 1 , wherein the following are required

e) a catalyst,

f) additives and/or auxiliary materials, and

g) chain breakers.