Method for producing cellulose fibers by use of cold-pad-batch

Abstract

Disclosed is a simple, economical and safe method of producing cellulose fibers with the use of a cold-pad-batch process. The method comprises adding alkali into fibers or fiber goods at least partially comprising cellulose diacetate fibers. In addition to exhibiting physical properties similar to those of viscose rayon fibers, the cellulose fibers are provided with an excellent sense of shari, which can be applied in cloth.

What is claimed is:  
     
         1 . A method of producing cellulose fibers by use of a cold-pad-batch process, wherein fibers or fiber goods at least partially comprising cellulose diacetate fibers with a degree of acetyl substitution of 2.0 to 2.75 (acetification of 45 to 59.5%) are treated with alkali at low temperature of 20 to 70° C. in a cold-pad-batch weight loss device to convert the cellulose acetate to cellulose.  
     
     
         2 . The method as set forth in  claim 1 , wherein the fibers or fiber goods are treated with strong alkali, or a combination of strong and weak alkali in one bath or two baths.  
     
     
         3 . The method as set forth in  claim 1 , wherein the fibers or fiber goods are treated with alkali at a concentration of alkali of 20 to 53% for 1 to 48 hours.  
     
     
         4 . The method as set forth in  claim 1 , wherein the fibers or fiber goods are treated with alkali and a reaction rate controlling agent, said reaction rate controlling agent being selected from the group consisting of quaternary ammonium salt and phosphonium salt.