Patent ID: 7241854

Claim:
A process for the preparation of thermoplastic polyurethanes, wherein (i) a thermoplastic polyester is reacted with a diol (c) and then (ii) the reaction product of (i) containing (b1) polyesterdiol having a number average molecular weight of from 1000 to 5000 g/mol and a melting point greater than 150° C. and, optionally, (c) diol together with (b2) polyetherdiols and/or polyesterdiols, each having a melting point of less than 150° C. and a number average molecular weight of from 501 to 8000 g/mol and, optionally, further (c) diols having a number average molecular weight of from 62 to 500 g/mol are reacted with (a) isocyanate, in the presence or absence of (d) catalysts and/or (e) assistants.