GLYOXAL-TREATED WATER-DISPERSIVE POLYSACCHARIDE DERIVATIVE WHOSE GLYOXAL CONTENT IS REDUCED AND METHOD FOR REDUCING CONTENT OF UNBONDED GLYOXAL OF GLYOXAL-TREATED WATER-DISPERSIVE POLYSACCHARIDE DERIVATIVE BY ADDING ADDITIVE SUCH AS WATER-SOLUBLE BORIC ACID SALT

摘要

Glyoxal-treated polysaccharide derivatives are treated with an aqueous solution of water-soluble aluminum salts and/or water-soluble borates, optionally, with buffer substances to set pH of the glyoxal treated polysaccharide derivative, and dried.