Light-Fast Dyeings on Bicomponent Fibers

Abstract

Process for improving the light-fastness of dyeings on multicomponent fibres composed of a thermodynamically compatible polyolefin and polyamide with disperse dyes characterized in that they are subjected to a treatment with benzotriazole derivatives.

1 . A process for improving the light-fastness of a dispersed dyed multicomponent fiber, wherein the disperse dyed multicomponent fiber is composed of a thermodynamically compatible polyolefin and polyamide, comprising the step of treating the multicomponent fiber with at least one benzotriazole derivative. 
   
   
       2 . A process according to  claim 1 , wherein the at least one benzotriazole derivative is of the formula (I) 
     
       
         
         
             
             
         
       
       wherein 
       R 1  is a halogen atom, 
       R 2  is a C 1  to C 6  alkyl, and 
       R 3  is a C 1  to C 6  alkyl. 
     
   
   
       3 . A process according to  claim 1 , wherein the multicomponent fiber is composed of a thermodynamically compatible polypropylene, modified PA and polyamide. 
   
   
       4 . A process according to  claim 1 , wherein the multicomponent fiber consists of a core of a first polymer, and the core is sheathed by a second polymer. 
   
   
       5 . A process according to  claim 1 , wherein the at least one benzotriazole derivative is used in an amount of 0.01 to 20 percent by weight based on the dry weight. 
   
   
       6 . A process according to  claim 1 , wherein the disperse dyed multicomponent fiber is dyed with at least one disperse dye of the formulae (1) 
     
       
         
         
             
             
         
       
       wherein R 4  and R′ 4  are independently a phenyl group or a phenyl group substituted by halogen, CH 3 , —CH 2 CH 3 , —OCH 3 , —OCH 2 CH 3  or —OH, 
     
     or the formulae (2), (3) or (4) 
     
       
         
         
             
             
         
       
       wherein R 5 , R′ 5 , and R″ 5  are independently halogen, a phenyl group or a phenyl group substituted by halogen, —CH 3 , —CH 2 CH 3 , —OCH 3 , —OCH 2 CH 3  or —OH, 
     
     or the formulae (5) 
     
       
         
         
             
             
         
       
       wherein 
       R 6  is halogen, a phenyl group or a phenyl group substituted by halogen, —CH 3 , —CH 2 CH 3 , —OCH 3 , —OCH 2 CH 3  or —OH, or a phenyl group or a phenoxy group substituted by halogen, —CH 2 CH 3 , —OCH 3 , —OCH 2 CH 3  or —OH, 
       R 7  is a phenyl group or a phenyl group substituted by halogen, —CH 3 , —CH 2 CH 3 , —OCH 3 , —OCH 2 CH 3  or —OH, 
       R 8  is —NH 2  or —NHR 9 , where R 9  is halogen, a phenyl group or a phenyl group substituted by halogen, —CH 3 , —CH 2 CH 3 , —OCH 3 , —OCH 2 CH 3  or —OH, or a phenyl group or a phenoxy group substituted by halogen, —CH 3 , —CH 2 CH 3 , —OCH 3 , —OCH 2 CH 3  or —OH, or R 9  is a group of the formula SO 2 -phenyl, where the phenyl group of the SO 2 -phenyl group is not substituted, or is a phenyl group substituted by halogen, —CH 3 , —CH 2 CH 3 , —OCH 3 , —OCH 2 CH 3  or —OH, or is a phenyl group substituted by halogen, —CH 3 , —CH 2 CH 3 , —OCH 3 , —OCH 2 CH 3  or —OH, 
     
     or the formulae (6) 
     
       
         
         
             
             
         
       
       wherein 
       R 10  is —H or halogen. 
     
   
   
       7 . A light-fast multicomponent fiber made in accordance with the process of  claim 1 . 
   
   
       8 . A carpet or textile floorcovering comprising at least one light-fast multicomponent fiber according to  claim 7 . 
   
   
       9 . A process comprising the step of treating a multicomponent fiber composed of a thermodynamically compatible polyolefin and polyamide with at least one benzotriazole derivative. 
   
   
       10 . (canceled) 
   
   
       11 . A process according to  claim 3 , wherein the multicomponent fiber has a polyfilamentary character. 
   
   
       12 . A process according to  claim 4 , wherein the first polymer is a polyamide. 
   
   
       13 . A process according to  claim 4 , wherein the second polymer is a polypropylene