Disperse Dyes for Poly(Lactic Acid) Based Fibers

Abstract

The present invention relates to the use of a yellow and/or a red and/or a blue component of disperse dyes for dyeing poly(lactic acid) fibers or poly(lactic acid) based fibers.

1 - 7 . (canceled)  
     
     
         8 . A dyed poly(lactic acid) fiber or poly(lactic acid) based fiber material which has been dyed with a yellow component comprising at least one dyestuff of the group of the structural formulae (1), (2), (3), (4) and (5)  
       
         
           
           
               
               
           
         
         wherein R 1  is (C 1 -C 3 ) alkyl and R 2  is (C 4 -C 7 ) alkyl;  
         
           
             
             
                 
                 
             
           
         
         wherein n is 0 or 1;  
         
           
             
             
                 
                 
             
           
         
         wherein R 3  is (C 1 -C 3 ) alkyl or 2-hydroxyethyl;  
         
           
             
             
                 
                 
             
           
         
         and/or a red component comprising at least one dyestuff of the group of structural formulae (6) and (7)  
         
           
             
             
                 
                 
             
           
         
         wherein one of R 4  and R 5  is hydrogen and the other is hydroxyethoxyethyl, hydroxybutoxypropyl, acetoxyethoxyethyl or acetoxybutoxypropyl;  
         
           
             
             
                 
                 
             
           
         
         wherein R 6  is hydrogen or methyl;  
         and/or a blue component comprising at least one dyestuff of the group of structural formulae (8), (9) and (10)  
         
           
             
             
                 
                 
             
           
         
         wherein one of R 7  and R 8  is nitro and the other hydroxyl and R 9  is hydrogen, chlorine or 2-hydroxyethyl;  
         
           
             
             
                 
                 
             
           
         
         wherein R 10  is methoxypropyl, ethoxypropyl or methoxyethoxypropyl;  
         
           
             
             
                 
                 
             
           
         
       
     
     
         9 . The dyed fiber as claimed in  claim 8 , wherein a mixture comprising two or three of each of the yellow, the red and the blue dyestuffs is used.  
     
     
         10 . The dyed fiber as claimed in  claim 8 , wherein a mixture comprising a yellow component comprising at least one of the dyestuffs of the formulae (1), (3) and (4), a red component comprising at least one dyestuff of the formula (6) and a blue component comprising at least one dyestuff of the formula (8) is used.  
     
     
         11 . The dyed fiber as claimed in  claim 8 , which further comprises an ultraviolet absorber is used conjointly with of each of the yellow, the red and/or the blue dyestuffs.  
     
     
         12 . The dyed fiber as claimed in  claim 10 , which further comprises an ultraviolet absorber is used conjointly with of each of the yellow, the red and/or the blue dyestuffs.  
     
     
         13 . The dyed fiber as claimed in  claim 8  wherein a poly(lactic acid) based fiber is dyed which comprises a mixture of poly(lactic acid) and an aromatic polyester fiber is used.  
     
     
         14 . The dyed fiber as claimed in  claim 12  wherein a poly(lactic acid) based fiber is dyed which comprises a mixture of poly(lactic acid) and an aromatic polyester fiber is used.