Some process aspects of preparation and use of carboxyl-containing polyvinyl alcohol fibers

The temperature and time conditions of esterification with maleic acid of p olyvinyl alcohol fibers of various brands, differing in the temperature of dissolution in water, were studied. A simplified process was proposed for p reparing water-soluble carboxyl-containing polyvinyl alcohol fibers, with c ombined heat treatment and esterification with maleic acid of freshly forme d fibers. The public-health tests of the carboxyl-containing fibers were pe rformed, and a positive toxicological conclusion was received for these fib ers as hemosorbents.