Hoechst Aktiengesellschaft

Hoechstaktiengesellschaft

Gerhard Leumer

Herbert Wellenhofer

Andreas Fischer

Werner Bruckner

Hans-Jurgen Profe

Diethelm Rabe

The present invention provides a flammability multifilament yarn comprising a polyester formed from dicarboxylic acid and diol components which contains, in the polymer chain, units of the formula I ##STR1## where R is a saturated open-chain or cyclic alkylene, arylene or aralkylene radical, and

High tenacity, low flammability polyester yarn, production thereof and

A high hydrolysis and aminolysis resistance multifilament yarn composed of a polymer based on poly(1,4-cyclohexanedimethylene terephthalate), wherein at least 85 mol % of the diol-derived groups of the polyester are 1,4-cyclohexanedimethylene groups, characterized by a tenacity of above 40 cN/tex, a dry heat shrinkage S.sub.200 of below 10% and a post hydrolysis or aminolysis treatment strength of at least 85% of the original strength. A process for producing this multifilament yarn comprises maintaining the temperature of the melt at from 295.degree. to 305.degree. 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.degree. C.

Poly (1,4-cyclohexanedimethylene terephthalate) multifilament yarns for

A process for producing fiber from polyarylene sulfide, by melt spinning a polyarylene sulfide into a gas, cooling the spun filaments with a blown gas, taking the filaments off at a high speed, storing the spun filaments, drawing the spun filaments in two stages and after treatment stage, and immediately thereafter heat setting the drawn filaments. Fibers produced by the invention have excellent mechanical properties including tensile strength and transverse strength, and the process is very efficient.

Process for producing polyarylene sulfide fiber and thereby obtainable

A process produces fibers from polymers which give off troublesome gases and/or vapors during spinning, comprising the steps of:

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Bobingen, Germany

Gerhard Leumer