Multifilamentgarne für technische Einsatzgebiete aus Poly-(1,4-bis-methylen-cyclohexan-terephthalat) und Verfahren zu ihrer Herstellung

摘要

Described is a high hydrolysis and aminolysis resistance multifilament yarn composed of a polyester based on poly(1,4-cyclohexanedimethylene terephthalate), characterised in that at least 85 mol% of the diol-derived groups of the polyester are 1,4-cyclohexanedimethylene groups and in that the yarn has a tenacity of above 40 cN/tex, a dry heat shrinkage S200 of below 10% and a post hydrolysis or aminolysis treatment strength of at least 85% of the original strength. There is also described a process for producing this multifilament yarn by maintaining the temperature of the melt at from 295 to 305 DEG C, taking off the filaments at a spinning take-off speed of below 1500 m/min, drawing the spun filaments continuously or batchwise in at least two stages using a defined draw ratio and defined temperatures in every stage, and subjecting the drawn filaments to a setting and relaxing treatment at temperatures above 230 DEG C.