Polyethylene terephthalate filament having high tenacity for industrial use

Abstract

A polyethylene terephthalate monofilament obtained by spinning a polyethylene terephthalate chip having an intrinsic viscosity of 0.8 to 1.3, which gives a stress-strain curve exhibiting an elongation of less than 2.5% at an initial stress of 2.0 g/d, with an initial modulus value of 80 to 160 g/d, an elongation of 7.5% or less in a stress range of from 2.0 g/d to 9.0 g/d, and an elongation of at least 2.0% or more in a stress range of from 10.0 g/d to the point of break, is provided.

1 . A polyethylene terephthalate monofilament, which is obtained by spinning a polyethylene terephthalate chip having an intrinsic viscosity of 0.8 to 1.3, 
 wherein the polyethylene terephthalate monofilament gives a stress-strain curve exhibiting an elongation of less than 2.5% at an initial stress of 2.0 g/d, with an initial modulus value of 80 to 160 g/d, an elongation of 7.5% or less in a stress range of from 2.0 g/d to 9.0 g/d, and an elongation of at least 2.0% or more in a stress range of from 10.0 g/d to the point of break.    
   
   
       2 . The polyethylene terephthalate monofilament according to  claim 1 , wherein the linear density of the polyethylene terephthalate is 3 to 30 denier.  
   
   
       3 . A polyethylene terephthalate multifilament, which is obtained by aggregating 50 to 40,000 polyethylene terephthalate monofilaments according to  claim 1 .  
   
   
       4 . The polyethylene terephthalate multifilament according to  claim 3 , which is obtained by aggregating 192 or 384 polyethylene terephthalate monofilaments.  
   
   
       5 . The polyethylene terephthalate multifilament according to  claim 3 , wherein the strength of the polyethylene terephthalate multifilament has a stress of 10 to 13 g/d.  
   
   
       6 . The polyethylene terephthalate multifilament according to  claim 3 , wherein the elongation at break of the polyethylene terephthalate multifilament is 9.5 to 13.5%.  
   
   
       7 . An industrial product selected from the group consisting of industrial rope, reinforcement material for construction, webbing and seatbelt, all of which comprise the polyethylene terephthalate multifilament according to  claim 3.