Production and use of new thermoplastic polyurethane elastomers based on polyether carbonate polyols

A process for the production of an injection-molded or extruded item comprising preparing a thermoplastic polyurethane elastomer by reacting, in a reactive extruder, in a first step, at least

• A) one organic diisocyanate comprising two isocyanate groups with
• B) one polyol with number-average molar mass Mn ≧500 and ≦5000 g/mol, which has two isocyanate-reactive groups,
• to give an isocyanate-terminated prepolymer,
• and reacting, in a second step, the prepolymer with
• C) one or more chain extenders with molar mass ≧60 and ≦490 g/mol, which have two isocyanate-reactive groups,
• and optionally
• D) a monofunctional chain terminator which has an isocyanate-reactive group and/or optionally
• E) an organic diisocyanate comprising two isocyanate groups,
• where
• F) a catalyst
• is optionally used in the first and/or second step,
• the molar ratio of the entirety of the isocyanate groups from A) and optionally E) to the entirety of the isocyanate-reactive groups in B), C), and optionally D) is ≧0.9:1 and >1.2:1 and
• component B) comprises at least one polyether carbonate polyol obtainable via an addition reaction of carbon dioxide and a mixture of 75 to 100% by weight of propylene oxide and 0 to 25% by weight of ethylene oxide onto H-functional starter substances, and
• injection molding or extruding the thermoplastic polyurethane elastomer to produce the injection-molded or extruded item.