METHOD OF PRODUCING THERMOPLASTIC POLYURETHANE ELASTOMER

PROBLEM TO BE SOLVED: To provide a method of continuously producing thermoplastic polyurethane elastomers with improved homogeneity and fusing characteristics. SOLUTION: The invention relates to a method of continuously producing thermoplastic polyurethane elastomers with improved homogeneity and fusing characteristics, such that one or several kinds of organic isocyanates (A) and a mixture (B) with a Zerewitinoff active hydrogen atom consisting of (B1) which has 1-85 equivalent% (in relation to organic isocyanate groups in (A)) of one or several compounds with an average of at least 1.8 pieces of Zerewitinoff active hydrogen atoms and an average molecular weight Mnof 450-10,000 and (B2) which has 15-99 equivalent% (in relation to the organic isocyanate groups in (A)) of one kind or several kinds of chain extenders with an average of at least 1.8 pieces of Zerewitinoff hydrogen atoms and a molecular weight of 60-400; in addition to 0-20 wt.% (in relation to the total amount of TPU) of other auxiliary agents and an additive (C); are mixed in a homogeneous manner in a reactor over a maximum period of 5 seconds, so that there is a temperature difference of less than 20°C between constituents (A) and (B) before they are brought together in the reactor. COPYRIGHT: (C)2009,JPO&INPIT