Process of producing a multi-filament, multi-filament produced therefrom and use of the multi-filament

Abstract

A process produces a multi-filament by melt-spinning a composition containing a thermoplastic polyurethane. The process includes (a) passing the composition in a molten state through a spinneret, to obtain an extruded filament; (b) passing the extruded filament through a set of godet rollers; and (c) winding the extruded filament from (b) onto a bobbin through a winder with a winding speed of 2000-5000 m/min. The thermoplastic polyurethane has a Shore hardness measured according to DIN ISO 7619-1 of 68D-90D. A multi-filament is obtained from the process of the present invention.

1 . A process of producing a multi-filament by melt-spinning a composition containing a thermoplastic polyurethane, the process comprising:
 (a) passing the composition in a molten state through a spinneret, to obtain an extruded filament,   (b) passing the extruded filament through a set of godet rollers, and   (c) winding the extruded filament from step (b) onto a bobbin through a winder with a winding speed of 2000-5000 m/min,   wherein the thermoplastic polyurethane has a Shore hardness measured according to DIN ISO 7619-1 of 68D-90D.   
     
     
         2 . The process of  claim 1 , wherein the set of godet rollers in (b) comprises a first godet roller operating at a speed of 1000-4000 m/min and. 
     
     
         3 . The process of  claim 1 , wherein the set of godet rollers in (b) comprises a first godet roller, a second godet roller, and a third godet roller positioned in series, wherein:
 the first godet roller operates at a speed of 1000-4000 m/min;   the second godet roller operates at a speed of 2000-5000 m/min; and   the third godet roller operates at a speed of 2000-5000 m/min.   
     
     
         4 . The process of  claim 3 , wherein
 the first godet roller operates at a surface temperature of 30-120° C.,   the second godet roller operates at a surface temperature of 60-170° C., and   the third godet roller operates at a surface temperature of 30-120° C.   
     
     
         5 . The process of  claim 1 , further comprising:
 (a1) oiling the extruded filament with a spinning oil before step (b).   
     
     
         6 . The process of  claim 1 , wherein the thermoplastic polyurethane comprises a reaction product of:
 (A) a polyol;   (B) a diisocyanate; and   (C) a chain extender,   wherein the polyol is selected from the group consisting of polyether polyols, polyester polyols, and any mixture thereof.   
     
     
         7 . The multi-filament obtained from the process of  claim 1 . 
     
     
         8 . The multi-filament of  claim 7 , wherein a boiling water shrinkage according to ASTM D2259-02 of the multi-filament is no more than 18%. 
     
     
         9 . The multi-filament of  claim 7 , wherein elongation at break of the multi-filament is less than 55% a winding speed of lower than 3000 m/min, measured according to ISO2062:2009, method A. 
     
     
         10 . The multi-filament of  claim 7 , which is of bi-component structure or micro tube structure. 
     
     
         11 . An article of clothing, comprising:
 the multi-filament of  claim 7 .   
     
     
         12 . The process according to  claim 1 , wherein the winding speed in (c) is 2100-2900 m/min, and the Shore hardness is from 81D-87D. 
     
     
         13 . The process according to  claim 2 , wherein the first godet roller operates at a surface temperature of 30-120° C. 
     
     
         14 . The process according to  claim 2 , wherein the first godet roller operates at a speed of 1200-2100 m/min and a surface temperature of 60-90° C. 
     
     
         15 . The process according to  claim 3 , wherein the second godet roller operates at a speed faster than the operating speed of the first and third godet rollers. 
     
     
         16 . The process according to  claim 3 , wherein the first godet roller operates at a speed of 1200-2100 m/min, the second godet roller operates at a speed of 2600-3200 m/min, and the third godet roller operates at a speed of 2400-3000 m/min. 
     
     
         17 . The process according to  claim 4 , wherein the second godet roller operates at a surface temperature higher than either of the surface temperature of the first godet roller and the surface temperature of the third godet roller. 
     
     
         18 . The process according to  claim 4 , wherein the first godet roller operates at a surface temperature of 60-90° C., the second godet roller operates at a surface temperature of 90-130° C., and the third godet roller operates at a surface temperature of 60-90° C. 
     
     
         19 . The multi-filament of  claim 8 , wherein the boiling water shrinkage of the multi-filament is no more than 10%. 
     
     
         20 . The multi-filament of  claim 9 , wherein the elongation at break of the multi-filament is less than 40%.