Polyphenylene sulfide filament yarns

Abstract

A polyphenylene sulfide multifilament yarn having a filament linear density of 5 dtex to 30 dtex, an overall linear density of 500 dtex to 2500 dtex, a breaking tenacity in the range of 50 cN/tex to 80 cN/tex and an elongation at break of 8% to 16% for a yarn with a breaking tenacity in the range of 60 cN/tex to 80 cN/tex and an elongation at break of 16% to 30% for a yarn with a breaking tenacity in the range of 50 cN/tex to 60 cN/tex.

1 . A polyphenylene sulfide multifilament yarn obtained from a process comprising:
 feeding a melt of polyphenylene sulfide to a spinning device;   extruding the melt through a spinneret with a plurality of spinneret holes to form a filament bundle with a plurality of filaments;   subjecting the filament bundle to a passive cooling stage, which includes passing the filament bundle through a perforated or porous tube or passing the filament bundle between perforated or porous panels for a time period of between 0.1 s to 0.3 s after the filament bundle leaves the spinneret;   subjecting the filament bundle to an active cooling stage;   drawing the filament bundle after subjecting the filament bundle to the passive cooling stage and the active cooling stage; and   winding the filaments after solidifying and the drawing.   
     
     
         2 . A polyphenylene sulfide multifilament yarn having a filament linear density of 5 dtex to 30 dtex, an overall linear density of 500 dtex to 2500 dtex, a breaking tenacity in the range of 50 cN/tex to 80 cN/tex,
 wherein a yarn with a breaking tenacity in the range of 60 cN/tex to 80 cN/tex exhibits an elongation at break of 8% to 16% and a yarn with a breaking tenacity in the range of 50 cN/tex to 60 cN/tex exhibits an elongation at break of 16% to 30%.   
     
     
         3 . The polyphenylene sulfide multifilament yarn according to  claim 1 , wherein the polyphenylene sulfide consists of at least 90% by weight of an uncrosslinked linear polyphenylene sulfide polymer material. 
     
     
         4 . The polyphenylene sulfide multifilament yarn according to  claim 2 , wherein for a spun length of 10,000 m the multifilament yarn has a fluff index of less than 2500. 
     
     
         5 . The polyphenylene sulfide multifilament yarn according to  claim 2 , wherein for a spun length of 10,000 m the multifilament yarn has a fluff index of less than 1000. 
     
     
         6 . The polyphenylene sulfide multifilament yarn according to  claim 2 , wherein for a spun length of 10,000 m the multifilament yarn has a fluff index of less than 500. 
     
     
         7 . The polyphenylene sulfide multifilament yarn according to  claim 2 , wherein the multifilament yarn has a filament linear density of 5 dtex to 20 dtex. 
     
     
         8 . The polyphenylene sulfide multifilament yarn according to  claim 2 , wherein the multifilament yarn has a breaking tenacity in the range of 50 cN/tex to 60 cN/tex. 
     
     
         9 . Backing fabrics comprising the polyphenylene sulfide multifilament yarn according to  claim 1 . 
     
     
         10 . Backing fabrics comprising the polyphenylene sulfide multifilament yarn according to  claim 2 .