Oxidized Cellulose, Method of Producing Oxidized Cellulose and Nanocellulose, and Nanocellulose Dispersion

Patent metadata

Field	Value
Publication number	US-2021301034-A1
Application number	US-201917265035-A
Country	US
Kind code	A1
Filing date	Aug 2, 2019
Priority date	Aug 3, 2018
Publication date	Sep 30, 2021
Grant date	—

Abstract

Provided is an oxidized cellulose, a 13 C solid-state NMR spectrum of the oxidized cellulose including a number of peaks in a range of from 165 ppm to 185 ppm, which can be produced by oxidizing a cellulose raw material with a hypochlorous acid or salt thereof having an available chlorine concentration of from 6% by mass to 14% by mass, while adjusting the pH in a range of from 5.0 to 14.0.

First claim

1 . An oxidized cellulose, a 13 C solid-state NMR spectrum of the oxidized cellulose comprising a plurality of peaks in a range of from 165 ppm to 185 ppm.

2 . An oxidized cellulose, not containing an N-oxyl compound, a 13C solid-state NMR spectrum of the oxidized cellulose comprising a plurality of peaks in a range of from 165 ppm to 185 ppm.

3 . A method of producing the oxidized cellulose, the method comprising:
oxidizing a cellulose raw material with a hypochlorous acid or salt thereof having an available chlorine concentration of from 6% by mass to 14% by mass, while adjusting the pH in a range of from 5.0 to 14.0.

4 . The method of producing an oxidized cellulose according to claim 3 , wherein the hypochlorous acid or salt thereof is sodium hypochlorite.

5 . The method of producing an oxidized cellulose according to claim 3 , wherein the cellulose raw material is oxidized while adjusting the pH in a range of from 7.0 to 14.0.

6 . The method of producing an oxidized cellulose according to claim 3 , wherein a content of carboxyl groups in the oxidized cellulose is from 0.20 mmol/g to 3.0 mmol/g with respect to a dry mass of the oxidized cellulose.

7 . A method of producing a nanocellulose, the method comprising fibrillating and nanoizing the oxidized cellulose according to claim 1 .

8 . A nanocellulose dispersion, comprising the nanocellulose produced by the method according to claim 7 dispersed in at least one selected from the group consisting of water, acetonitrile, and a carbonate ester.

Assignees

• Toagosei Co Ltd

Inventors

• Kamiya Daisuke
• Matsuki Shiroshi
• Takada Jun

Classifications

• D21H11/18

  Highly hydrated, swollen or fibrillatable fibres · CPC title

• C08L1/04 Primary

  Oxycellulose; Hydrocellulose {, e.g. microcrystalline cellulose} · CPC title

• C08B15/02

  Oxycellulose; Hydrocellulose; {Cellulosehydrate, e.g. microcrystalline cellulose} · CPC title

• C08B15/04 Primary

  Carboxycellulose, e.g. prepared by oxidation with nitrogen dioxide · CPC title