US 2003/0158365 A1Published application

Continuous production of thermoplastic polyurethane elastomers

OwnerWolfgang Brauer, Herbert Heidingsfeld +6inventors

InventorsWolfgang Brauer, Herbert Heidingsfeld, Hans-Georg Hoppe, Wolfgang Kaufhold, Bernhard Schulte, Jack C. Chan, Steven C. Manning, Nicholas R. Nardo

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Abstract

A continuous process for the preparation of a thermoplastic polyurethane elastomer is disclosed. The process is carried out at 130 to 250° C. and comprises reacting at least one polyether diol with at least one organic diisocyanate and 1,4-di-(2,2′-hydroxyethyl)-hydroquinone, in the presence of tin dioctoate as a catalyst. The resulting thermoplastic polyurethane has a glass transition temperature (Tg) below 50° C. The inventive thermoplastic polyurethane is suitable for making injection molded or extruded articles.

Claims6

Dependent claims

A continuous process for the preparation of a thermoplastic polyurethane elastomer at a temperature of 130 to 250° C. comprising reacting:

A) at least one polyether diol having a number average molecular weight (Mn) of 450 to 10,000 and, on average, 1.8 to 2.2 Zerewitinoff active hydrogen atoms;
with
B) at least one organic diisocyanate;
and
C) 1,4-di-(2,2′-hydroxyethyl)-hydroquinone, in the presence of 10 to 1000 ppm in relation to A) of tin dioctoate as a catalyst
with the proviso that the NCO/OH ratio of the reactants A), B) and C) is 0.85 to 1.2, said thermoplastic polyurethane having a glass transition temperature (Tg) below 50° C.

3 more elements

Dependencies are inferred from the claim text.