Patent ID: 6627750
Filing Date: 2003-09-30
Classification: A61L,C08B,D06M,D21C,D21H,Y10T

Abstract:
A process for the making of water-insoluble carboxylated polysaccharide fibers comprising:(a) dispersing polysaccharide fibers in organic acid to form a fiber suspension having a fiber consistency of about 0.5% to about 20% by weight. (b) adding a dicarboxylic acid anhydride or anhydrous dicarboxylic acid chloride to said fiber suspension in a mole ratio to said polysaccharide fiber of from about 0.1:1.0 to about 10.0:1.0 to form a reaction mixture and reacting said mixture at about 50Â° C. to about 118Â° C. in the presence of a basic catalyst for a time sufficient to obtain carboxylated polysaccharide fibers.