Thermoplastic polyurethane molding composition giving little condensate, for surface cladding on vehicles
Thermoplastic polyurethane molding composition, suitable for powder sintering, comprises a polyol mixture, 1,6-hexamethylene diisocyanate and butan-1,4-diol. Thermoplastic polyurethane molding composition, suitable for powder sintering, comprises: (i) 100 parts weight polyol mixture (I) of 30-80 par...
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Zusammenfassung: | Thermoplastic polyurethane molding composition, suitable for powder sintering, comprises a polyol mixture, 1,6-hexamethylene diisocyanate and butan-1,4-diol. Thermoplastic polyurethane molding composition, suitable for powder sintering, comprises: (i) 100 parts weight polyol mixture (I) of 30-80 parts weight aliphatic polycarbonate diol (IA), with a number average molecular weight, Mn, of 1000-2200, and 70-20 parts weight polybutandiol adipate (IB) or polycaprolactone-diol (IC) with Mn of 1000-2400; (ii) 1,6-hexamethylene diisocyanate (HMDI) in an equivalence ratio of (2.3-6.0):1.0 with respect to (I); and (iii) butan-1,4-diol (II) as chain extender, in an equivalence ratio of (1.3-5.2):1.0 with respect to (I). The isocyanate (NCO) index (100 times quotient of equivalence ratio of NCO groups and sum of hydroxyl (OH) groups in (I) and (II)) is 96-99. Independent claims are also included for (a) moldings and films made from the composition; (b) a process for improving the fogging and reducing the amount of condensate (measured to DIN 75201) in thermoplastic urethanes; and (c) the production of the molding composition. |
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