| abstract |
PROBLEM TO BE SOLVED: To provide a method for producing a heat-stable and light-stable carboxylated cellulose fiber which does not significantly sacrifice fiber strength and degree of polymerization using an environmentally friendly chemical. It is. The method comprises using a catalytic amount of a sterically hindered cyclic oxammonium salt as a first oxidant and peracid and halide salts as a second oxidant in an aqueous environment. Oxammonium compounds may be formed in situ from the corresponding amine, hydroxylamine, and nitroxyl compounds. The oxidized cellulose is then added to D.I. P. Oxidizing agents such as sodium chlorite under acidic conditions to stabilize against degradation and color return, Further treatment with a chlorine dioxide / hydrogen peroxide mixture or a peracid. Alternatively, the treatment may be carried out using a reducing agent such as sodium borohydride. |