Process for producing polyarylene sulfide fiber and thereby...

Details Process for producing polyarylene sulfide fiber and thereby... Process for producing polyarylene sulfide fiber and thereby...

D - Textiles, Paper

01

F

D01F 6/76 (2006.01) D01D 5/08 (2006.01)

Patent

CA 2098692

Abstract Process for producing polyarylene sulfide fiber and thereby obtainable polyarylene sulfide multifilament yarn There is described a process for producing fiber from polyarylene sulfide comprising the steps of: a) melt spinning a polyarylene sulfide into a gas, in particular into air, at a pump rate of at least 0.5 g/(min x hole), b) forcedly cooling the spun filaments in the spinning column by quenching with a blown gas, c) taking off the filaments at a speed of more than 800 m/min, preferably between 1000 and 5000 m/min, d) intermediately storing the spun filaments, e) drawing the spun filaments in two stages in an after- treatment stage by e1) drawing in the first stage at a temperature between the glass transition temperature and the yield tempera- ture and to such a degree that the filaments are vir- tually completely drawn and e2) drawing in the second stage at a temperature above that of the first stage and below the crystallite melting point temperature of the filaments to such a degree that the filaments are additionally drawn by 5 to 30% and in such a way that no mechanical contact is involved in the heat transfer of the second drawing stage and the drawing tension is 11 to 25 cN/tex, based on the true linear density, and f) immediately thereafter heat setting the drawn fila- ments. The process of the invention is suitable for producing fiber having very good mechanical properties, such as tensile strength and transverse strength. The process is notable for high productivity, since high takeoff speeds are employed and subsequent drawing is carried out in two stages.

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