Fluorescent fiber, its use and processes for its production

Abstract

The present invention relates to a regenerated cellulosic fiber which contains an incorporated dye pigment and a fluorescent dye applied by overdying, the use of this fiber for the production of yarns and fabrics and a process for the production of these fibers. This fiber satisfies the demands of EN 471 in relation to luminance factor, the chromaticity coordinates and color fastness and possesses a light fastness (ISO 105-B02, process 2) of more than 5.

1 . A cellulosic regenerated fiber comprising an incorporated dye pigment and a fluorescent dyestuff wherein the fluorescent dyestuff is applied by overdying. 
     
     
         2 . The cellulosic regenerated fiber according to  claim 1 , wherein said fiber has a light fastness, measured according to ISO 105-B02, process 2, of more than 5. 
     
     
         3 . The cellulosic regenerated fibers according to  claim 1 , wherein said fiber is produced according to the Viscose, Modal or Lyocell process. 
     
     
         4 . The cellulosic regenerated fiber according to  claim 1 , wherein said fiber is finished in a flame-resistant manner. 
     
     
         5 . The cellulosic regenerated fiber according to  claim 4 , wherein the flame-resistant finish is an incorporated organophosphorus compound. 
     
     
         6 . The cellulosic regenerated fiber according to  claim 1 , further comprising an antibacterial agent. 
     
     
         7 . A yarn comprising the fibers according to  claim 1 ,  2 ,  3 ,  4 ,  5 , or  6 . 
     
     
         8 . A fabric comprising the fibers according to  claim 1 ,  2 ,  3 ,  4 ,  5 , or  6 . 
     
     
         9 . A reflective article comprising the fibers according to  claim 1 ,  2 ,  3 ,  4 ,  5 , or  6 . 
     
     
         10 . A process for the production of a fluorescent cellulosic regenerated fibers according to  claim 1 ,  2 ,  3 ,  4 ,  5 , or  6 , comprising incorporating a dye pigment into the fibers and overdying the fibers with a fluorescent dyestuff in a later process step. 
     
     
         11 . The process according to  claim 10 , wherein the overdying is performed in a continuous or discontinuous process step. 
     
     
         12 . The process according to  claim 10 , wherein the overdying is performed on a yarn or fabric made from the regenerated cellulosic fiber. 
     
     
         13 . The cellulosic regenerated fiber according to  claim 5 , wherein the organophosphorus compound is 2,2′-Oxybis[5,5-dimethyl-1,3,2-dioxaphosphorinan]2,2′disulfid. 
     
     
         14 . The reflective article according to  claim 9 , wherein said article is clothing.