Moulding masses with increased thermal stability, containing homo and/or copolymerizates of polyoxymethylene and thermoplastic polyurethane elastomers, process for their preparation and their use

摘要

Molding materials of (A) one or more polyoxymethylene homopolymers and/or copolymers and (B) one or more thermoplastic polyurethane elastomers, (C) with or without additives, contain, as an additive, (D) one or more alkaline earth metal silicates, advantageously in an amount of from 0.005 to 2% by weight, based on the weight of the components (A) and (B), for improving the heat stability, reducing the tendency to discoloration and minimizing the free formaldehyde content. To prepare the molding materials, the components (A), (B), (D) and, if required (C) are advantageously melted together in an extruder at from 150 DEG to 260 DEG C. The molding materials are useful for the production of films or moldings, which are used, for example, in the automotive, electrical appliances and electronics industries.