| abstract |
A process is claimed for the continuous prodn. of thermoplastic polyurethane (TPU)/copolymer mixts. (TPU/C) from (I) 1-60 wt% (w.r.t. total mixt.) of a thermoplastic copolymer contg. 1-30 wt% (w.r.t. copolymer) of a flow improver, and (II) PU-forming components comprising (A) di-isocyanate, (B) linear OH-terminated polyol with a mol. wt. of 500-5000 and (C) diol or diamine chain extenders with a mol. wt. of 60-500, with a mole ratio of NCO gps. in (A) to NCO-reactive gps. in (B) and (C) = 0.9-1.2. The process comprises feeding components (I) and (II), separately or in combination, into an extruder at one or more inlets and extruding the TPU/C mixt. when PU formation is complete. |