Material comprising ultrafine cellulose fibers

Patent metadata

Field	Value
Publication number	US-11084886-B2
Application number	US-201615760920-A
Country	US
Kind code	B2
Filing date	Sep 16, 2016
Priority date	Sep 17, 2015
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

An object of the invention is to provide a material comprising ultrafine cellulose fibers, having good dispersibility of fine particles in an aqueous medium containing ultrafine cellulose fibers. According to the invention, there is provided a material comprising ultrafine cellulose fibers, wherein the content of the ultrafine cellulose fibers is 80% by mass or more, and the haze value of a sample, which has been prepared by adding the material comprising ultrafine cellulose fibers to pure water to a solid concentration of 0.4% by mass, and stirring the mixture with a disperser under conditions of 1500 rpm and 5 minutes, is 20% or less.

First claim

The invention claimed is:

1. A material comprising ultrafine cellulose fibers and water, wherein a content of the ultrafine cellulose fibers is 82.1% by mass or more, and when a sample of the material comprising ultrafine cellulose fibers is added to water to a solid concentration of 0.4% by mass, and the resulting mixture is stirred with a disperser under conditions of 1500 rpm for 5 minutes to provide a dispersion, the haze value of the dispersion is 20% or less,
wherein the material comprising ultrafine cellulose fibers is in a particulate form and has a cumulative median diameter D50 of 1.2 mm or less.

2. The material comprising ultrafine cellulose fibers according to claim 1 , further comprising an organic solvent.

3. The material comprising ultrafine cellulose fibers according to claim 2 , wherein the organic solvent is isopropyl alcohol.

4. The material comprising ultrafine cellulose fibers according to claim 1 , further comprising a polyvalent metal.

5. The material comprising ultrafine cellulose fibers according to claim 1 , further comprising an acid at 0.14% by mass or less with respect to the mass of the ultrafine cellulose fibers.

6. The material comprising ultrafine cellulose fibers according to claim 1 , further comprising an alkali at 2% by mass or less with respect to the mass of the ultrafine cellulose fibers.

7. The material comprising ultrafine cellulose fibers according to claim 1 , wherein the ultrafine cellulose fibers have an ionic substituent.

8. The material comprising ultrafine cellulose fibers according to claim 1 , wherein the ultrafine cellulose fibers have a phosphoric acid group.

9. The material comprising ultrafine cellulose fibers according to claim 8 , wherein the amount of the phosphoric acid group in the ultrafine cellulose fibers is 0.5 mmol/g or more.

10. The material comprising ultrafine cellulose fibers according to claim 1 , wherein the content of the ultrafine cellulose fibers is 82.1% by mass or more and 95% by mass or less.

11. The material comprising ultrafine cellulose fibers according to claim 1 , wherein when a sample of the material comprising ultrafine cellulose fibers is added to water to a solid concentration of 0.4% by mass, and the resulting mixture is stirred with a disperser under conditions of 1500 rpm for 5 minutes to provide a dispersion, the pH of the dispersion is 7 to 11.

Assignees

• Oji Holdings Corp

Inventors

• HOMMA Ikue
• Shimaoka Takayuki

Classifications

• C08B15/04

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

• C08J3/02

  Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques · CPC title

• C08K5/05

  Alcohols; Metal alcoholates · CPC title

• C08L1/02

  Cellulose; Modified cellulose · CPC title

• D21H11/18

  Highly hydrated, swollen or fibrillatable fibres · CPC title