Patent ID: 9139662
Filing Date: 2015-09-22
Classification: C08B,D01F,D21C,D21H

Abstract:
1. A method for producing cellulose nanofibers comprising the following steps: (A) oxidizing a cellulosic starting material in the presence of an N-oxyl compound (a1) and a compound selected from the group consisting of bromides, iodides and mixtures thereof (a2), using an oxidizing agent (a3) to prepare an oxidized cellulosic starting material; and (B) preparing a dispersion liquid in which the oxidized cellulosic starting material obtained in the step A, or hydrolyzed, oxidized cellulosic starting material obtained in step C-2 below, is dispersed in water and defibrating the oxidized cellulosic starting material while dispersing the oxidized cellulosic starting material in water, to convert the oxidized cellulosic starting material into cellulose nanofibers, wherein the nanofibers are dispersed in water, and have an average width of about 2 to 5 nm and an average length of about 100 to 5000 nm, and the method further comprising the following step: (C) performing a treatment under alkaline conditions, wherein the step C is at least one of the following steps: