公开(公告)号：AT543849T

公开(公告)日：2012-02-15

申请号：AT07727977

申请日：2007-04-11

Applicant: BASF SE

Inventor： HENZE OLIVER STEFFEN ,  KRECH RUEDIGER ,  PRISSOK FRANK ,  SCHEFFER KARIN ,  SCHAEFER FRANK ,  NIERMANN HEINRICH

IPC: C08G18/66

Abstract: A process for the preparation of thermoplastic polyurethane by reacting (a) isocyanates with (b) compounds reactive toward isocyanates and having a molecular weight (Mw) of from 500 to 10 000 g/mol and (c) chain extenders having a molecular weight of from 50 to 499 g/mol, if appropriate in the presence of (d) catalysts and/or (e) conventional additives, wherein the chain extender mixture consisting of a main chain extender (c1) and one or more co-chain extenders (c2) is used and the thermoplastic polyurethane prepared has a rigid phase fraction of greater than 0.40, the rigid phase fraction being defined by the following formula: rigid ⁢⁢ phase ⁢⁢ fraction = { ∑ x = 1 k ⁢ [ ( m KVx / M KVx ) * M Iso + m KVx ] } / m ges with the following meanings: MKVx: molar mass of the chain extender x in g/mol mKVx: mass of the chain extender x in g MIso: molar mass of the isocyanate used in g/mol mges: total mass of all starting materials in g k: number of chain extenders.