Metal-containing oxidized cellulose nanofiber dispersion and method of producing the same

Abstract

Disclosed is a dispersion of metal-containing oxidized cellulose nanofibers with superior dispersibility, which is applicable to various uses. The disclosed metal-containing oxidized cellulose nanofiber dispersion comprises a dispersion medium, and metal-containing oxidized cellulose nanofibers containing a metal other than sodium in salt form, wherein the metal-containing oxidized cellulose nanofibers have a number-average fiber diameter of 100 nm or less.

1 . A metal-containing oxidized cellulose nanofiber dispersion comprising:
 a dispersion medium; and   metal-containing oxidized cellulose nanofibers containing a metal other than sodium in salt form, wherein   the metal-containing oxidized cellulose nanofibers have a number-average fiber diameter of 100 nm or less.   
     
     
         2 . The metal-containing oxidized cellulose nanofiber dispersion of  claim 1 , wherein the metal-containing oxidized cellulose nanofibers are metal-containing carboxylated cellulose nanofibers. 
     
     
         3 . The metal-containing oxidized cellulose nanofiber dispersion of  claim 1 , wherein the metal-containing oxidized cellulose nanofibers have a number-average fiber length of 50 nm to 2,000 nm. 
     
     
         4 . The metal-containing oxidized cellulose nanofiber dispersion of  claim 1 , wherein the metal-containing oxidized cellulose nanofibers have an average degree of polymerization of 100 to 2,000. 
     
     
         5 . The metal-containing oxidized cellulose nanofiber dispersion of  claim 1 , wherein the metal other than sodium is at least one metal selected from the group consisting of metals of Group 2 to Group 14 in Period 3 to Period 6 of the long periodic table. 
     
     
         6 . The metal-containing oxidized cellulose nanofiber dispersion of  claim 1 , wherein the metal other than sodium is at least one metal selected from the group consisting of magnesium, aluminum, calcium, titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, tin, barium, and lead. 
     
     
         7 . The metal-containing oxidized cellulose nanofiber dispersion of  claim 1 , wherein the metal other than sodium is at least one metal selected from the group consisting of aluminum, calcium, iron, cobalt, copper, zinc, and silver. 
     
     
         8 . The metal-containing oxidized cellulose nanofiber dispersion of  claim 1 , wherein the dispersion medium is water. 
     
     
         9 . A method of producing a dispersion of metal-containing oxidized cellulose nanofibers having a number-average fiber diameter of 100 nm or less, the method comprising:
 contacting oxidized cellulose nanofibers containing a first metal in salt form, dispersed in a solvent, with a salt of a second metal other than the first metal to provide metal-containing oxidized cellulose nanofibers containing the second metal in salt form.   
     
     
         10 . A method of producing a dispersion of metal-containing oxidized cellulose nanofibers having a number-average fiber diameter of 100 nm or less, the method comprising:
 contacting oxidized cellulose nanofibers containing a first metal in salt form, dispersed in a solvent, with a strong acid to substitute ions of the first metal contained in salt form by hydrogen atoms; and   contacting the oxidized cellulose nanofibers in which the ions of the first metal have been substituted by hydrogen atoms, dispersed in a solvent, with a salt of a second metal other than the first metal to provide metal-containing oxidized cellulose nanofibers containing the second metal in salt form.   
     
     
         11 . The method of producing a dispersion of metal-containing oxidized cellulose nanofibers of  claim 10 , wherein the oxidized cellulose nanofibers are carboxylated cellulose nanofibers. 
     
     
         12 . The method of producing a dispersion of metal-containing oxidized cellulose nanofibers of  claim 10 , wherein the metal-containing oxidized cellulose nanofibers have a number-average fiber length of 50 nm to 2,000 nm. 
     
     
         13 . The method of producing a dispersion of metal-containing oxidized cellulose nanofibers of  claim 10 , wherein the metal-containing oxidized cellulose nanofibers have an average degree of polymerization of 100 to 2,000. 
     
     
         14 . The method of producing a dispersion of metal-containing oxidized cellulose nanofibers of  claim 10 , wherein the first metal is sodium, and
 the second metal is at least one metal selected from the group consisting of metals of Group 2 to Group 14 in Period 3 to Period 6 of the long periodic table.   
     
     
         15 . The method of producing a dispersion of metal-containing oxidized cellulose nanofibers of  claim 10 , wherein the first metal is sodium, and
 the second metal is at least one metal selected from the group consisting of magnesium, aluminum, calcium, titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, tin, barium, and lead.   
     
     
         16 . The method of producing a dispersion of metal-containing oxidized cellulose nanofibers of  claim 10 , wherein the first metal is sodium, and
 the second metal is at least one metal selected from the group consisting of aluminum, calcium, iron, cobalt, copper, zinc, and silver.   
     
     
         17 . The method of producing a dispersion of metal-containing oxidized cellulose nanofibers of  claim 10 , wherein the solvent is water.