High shrinkage side by side type composite filament and a method for manufactruing the same

Abstract

The present invention relates to a high shrinkage side-by-side type composite filament, wherein two kinds of thermoplastic polymers are arranged side by side type and a boiling water shrinkage (Sr 2 ) measured by the method (initial load=notified denier×1/10 g, static load=notified denier×20/10 g) of clause 5.10 of JIS L 1090 is 20 to 75% of a boiling water shrinkage (Sr 1 ) measured by the method (initial load=notified denier×1/30 g, static load=notified denier×40/30 g) of clause 7.15 of JIS L 1013. The side-by-side type composite filament is made of two kinds of thermoplastic polymers having a number average molecular weight difference (ïMn) of 5,000 to 15,000 upon spinning and the composite filament is drawn and heat-treated so as to satisfy the following physical properties: Temperature area exhibiting 95% of maximum thermal stress (Tmax, 95%): 120 to 230° C. Range of maximum thermal stress per denier: 0.1 to 0.4 g/denier

1 . A high shrinkage side-by-side type composite filament, wherein two kinds of thermoplastic polymers are arranged side by side type and a boiling water shrinkage (Sr 2 ) measured by the method (initial load=notified denier×1/10 g, static load=notified denier×20/10 g) of clause 5.10 of JIS L 1090 is 20 to 75% of a boiling water shrinkage (Sr 1 ) measured by the method (initial load=notified denier×1/30 g, static load=notified denier×40/30 g) of clause 7.15 of JIS L 1013.  
   
   
       2 . A method for manufacturing a high shrinkage side-by-side type composite filament consisting two kinds of thermoplastic polymers which are arranged side-by-side type, wherein the two kinds of thermoplastic polymers having a number average molecular weight difference (ΔMn) of 5,000 to 15,000 are used upon spinning and the composite filament is drawn and heat-treated so as to satisfy the following physical properties: 
 Temperature area exhibiting 95% of maximum thermal stress (Tmax, 95%): 120 to 230° C.    Range of maximum thermal stress per denier: 0.1 to 0.4 g/denier    
   
   
       3 . The method of  claim 2 , wherein the composite filament is drawn and heat-treated so that the temperature distribution range (Tmax) of the maximum the thermal stress of the composite filament is 140 to 200° C.  
   
   
       4 . The method of  claim 2 , wherein the thermoplastic polymers are polyethylene terephthalate.  
   
   
       5 . A woven or knitted fabric containing the side-by-side type composite filament of  claim 1.