Fine cellulose fiber-containing substance, method for manufacturing the same, and fine cellulose fiber dispersion

Patent metadata

Field	Value
Publication number	US-11220787-B2
Application number	US-201816632799-A
Country	US
Kind code	B2
Filing date	May 30, 2018
Priority date	Jul 24, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A fine cellulose fiber-containing substance that has excellent dispersibility in water and can be manufactured easily. A method is for manufacturing the fine cellulose fiber-containing substance, and a method is for manufacturing a fine cellulose fiber dispersion. A fine cellulose fiber-containing substance contains fine cellulose fibers into which a phosphite containing a cation of an inorganic substance is introduced. The ratio of the cation of the inorganic substance with respect to 1 g of the fine cellulose fibers is 0.14 mmol or more. In manufacturing the fine cellulose fiber-containing substance, a phosphite is introduced into cellulose fibers, and then the cellulose fibers are defibrated to obtain a dispersion containing fine cellulose fibers, during which an alkali metal ion-containing substance is added to the cellulose fibers, and the dispersion is concentrated. In manufacturing a fine cellulose fiber dispersion, the fine cellulose fiber-containing substance is mixed with water.

First claim

The invention claimed is:

1. A fine cellulose fiber-containing substance comprising fine cellulose fibers into which a phosphite containing a cation of an inorganic substance is introduced,
wherein a ratio of the cation of the inorganic substance with respect to 1 g of the fine cellulose fibers is 0.14 mmol or more.

2. The fine cellulose fiber-containing substance according to claim 1 ,
wherein the fine cellulose fibers each have a fiber width of 1 to 1000 nm, and
functional groups represented by the following structural formula (1) are substituted for a part of hydroxy groups of the cellulose fibers to introduce a phosphite containing the cation of the inorganic substance:

wherein a represents any one of nothing, R, and NHR, R represents any one of a hydrogen atom, a saturated-linear hydrocarbon group, a saturated-branched hydrocarbon group, a saturated-cyclic hydrocarbon group, an unsaturated-linear hydrocarbon group, an unsaturated-branched hydrocarbon group, an aromatic group, and a derived group thereof, and f3 represents a cation of an inorganic substance.

3. The fine cellulose fiber-containing substance according to claim 2 , wherein the cation of the inorganic substance is an alkali metal ion or an alkaline earth metal ion.

4. The fine cellulose fiber-containing substance according to claim 2 , having a moisture content of less than 90% by mass.

5. The fine cellulose fiber-containing substance according to claim 1 , wherein the cation of the inorganic substance is an alkali metal ion or an alkaline earth metal ion.

6. The fine cellulose fiber-containing substance according to claim 5 , having a moisture content of less than 90% by mass.

7. The fine cellulose fiber-containing substance according to claim 1 , having a moisture content of less than 90% by mass.

Assignees

• Daio Seishi Kk

Inventors

• Matsusue Ikko

Classifications

• D21H11/18

  Highly hydrated, swollen or fibrillatable fibres · CPC title

• C08L1/16 Primary

  Esters of inorganic acids · CPC title

• D21H15/04

  crimped, kinked, curled or twisted fibres · CPC title

• C08B5/00 Primary

  Preparation of cellulose esters of inorganic acids {, e.g. phosphates (rendering cellulose suitable for esterification C08B1/02)} · CPC title

• A61K8/731

  Cellulose; Quaternized cellulose derivatives · CPC title