Elastic filament threads with low shrinkage at boil - are prepd. from segmented melt-spinnable elastomer by stretching and thermo-fixing

摘要

Dimensionally stable threads are prepd. from a segmented elastomer (I) by melt-spinning, stretching, then thermofixing. Elastic threads prepd. by the above process are claimed, having reversible extension of 20-600% (on length of smooth, tension-free thread), tear strength at least 30 cN/tex, and shrinkage at boil less than 10%. Pref. the threads are thermofixed at 90-200 deg.C for 0.01-5 secs.. Threads are thermofixed by satd. steam in a steam pipe. Threads are thermofixed by passing between 2 pairs of Godet wheels and over heated metal surfaces. (I) is polyurethane, polyether-ester, polyester-ester, or polyether-amide. USE/ADVANTAGE - Prepn. of (elastic) flat textile prods. (claimed). Threads do not stick together on winding nor have fibrils stuck together.