LINEAR POLYURETHANE ELASTOMERS AND PROCESS FOR THEIR PREPARATION

摘要

The invention relates to essentially linear polyurethane elastomers, having improved properties, made from polyester or polyether diols, diisocyanates and chain extenders, the latter having liquid-crystalline properties; and also films and, in particular, fibres which are prepared on the basis of such liquid-crystalline polyurethane components and are shaped thermoplastically (via melting) or from solutions (by solution spinning processes). The invention furthermore relates to an appropriate process for the preparation of the polyurethane elastomers, particularly of PU elastomer fibres (Elasthan and Spandex fibres).