| 摘要 |
The invention relates to a method for producing a thermoplastic polyurethane elastomer, comprising the reaction of at least A) one organic diisocyanate containing two isocyanate groups with B) a polyol having a number-average molecular weight Mn ≥ 500 and ≤ 5000 g/mol, which has at least two isocyanate-reactive groups, and C) one or more chain extenders having a molecular weight ≥ 60 and ≤ 490 g/mol, which have two isocyanate-reactive groups, and optionally D) a monofunctional chain stopper, which has one isocyanate-reactive group, and/or E) a catalyst, wherein the molar ratio of the isocyanate groups from A) to the sum of the groups reactive to isocyanate in B), C), and, if applicable, D) is ≥ 0.9:1 and ≤ 1.2:1, and component B) contains at least one polyether carbonate polyol, which can be obtained by adding carbon dioxide and alkylene oxides to H-functional starter substances. The invention further relates to a thermoplastic polyurethane elastomer produced in accordance with the method according to the invention, the use of said thermoplastic polyurethane elastomer to produce extruded or injection molded items, and the items produced by extrusion or injection molding. |
