Fine cellulose fiber dispersion liquid and manufacturing method thereof, cellulose film and laminate body

Patent metadata

Field	Value
Publication number	US-9534091-B2
Application number	US-201113583126-A
Country	US
Kind code	B2
Filing date	Mar 3, 2011
Priority date	Mar 9, 2010
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

Disclosed is a dispersion liquid containing fine cellulose fiber capable of uniform dispersion in an organic solution or resin and capable of use in electronic components. Further disclosed are a laminate body and a cellulose film obtained from fine cellulose fibers with improved water resistance. Further disclosed are a fine cellulose fiber dispersion liquid which forms a film as an undercoat of a base material, in particular of a base material made from naturally occurring materials such as polylactic acid, wherein said film has an improved adhesiveness with respect to said base material; and a laminate body using the same. The fine cellulose fiber dispersion liquid contains at least fine cellulose fibers, and either an ammonia or an organic alkali.

First claim

The invention claimed is:

1. A fine cellulose fiber dispersion liquid comprising at least: a fine cellulose fiber having a carboxyl group; and either an ammonia or an organic alkali, the fine cellulose fiber dispersion liquid having a pH greater than 7 and less than or equal to 12.

2. The fine cellulose fiber dispersion liquid according to claim 1 , wherein the organic alkali is either an amine or an organic onium compound having a hydroxide ion as a counter ion.

3. The fine cellulose fiber dispersion liquid according to claim 1 , wherein the organic alkali is a quaternary ammonium compound having a hydroxide ion as a counter ion.

4. The fine cellulose fiber dispersion liquid according to claim 1 , further comprising:
a water-based medium, being either water or a mixed liquid comprising water and an alcohol that is methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, or 2-butanol.

5. The fine cellulose fiber dispersion liquid according to claim 1 , further comprising a water-soluble organic solvent.

6. The fine cellulose fiber dispersion liquid according to claim 5 , wherein the water-soluble organic solvent is at least one organic solvent selected from the group consisting of methanol, ethanol, 2-propanol, acetone, methyl ethyl ketone, 1,4-dioxane, tetrahydrofuran, N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulfoxide, acetonitrile, and ethyl acetate.

7. The fine cellulose fiber dispersion liquid according to claim 6 , wherein an amount of the water-soluble organic solvent is at least 0.1% by weight, relative to a total amount of the fine cellulose fiber dispersion liquid.

8. The fine cellulose fiber dispersion liquid according to claim 1 , further comprising an additive agent comprising a compound having a reactive functional group.

9. The fine cellulose fiber dispersion liquid according to claim 1 , wherein the fine cellulose fiber is an oxidized cellulose having a carboxyl group introduced by oxidation reaction, and a content of the carboxyl group is 0.1 mmol/g to 2 mmol/g.

10. The fine cellulose fiber dispersion liquid according to claim 9 , wherein a number-average fiber diameter of the fine cellulose fiber is 0.003 μm to 0.050 μm.

11. A cellulose film formed by drying the fine cellulose fiber dispersion liquid of claim 1 .

12. A laminate body comprising: a coating film formed by coating the fine cellulose fiber dispersion liquid of claim 1 on at least one surface of a base material.

13. The laminate body according to claim 12 , wherein the coating film is an undercoat layer.

14. A laminate body comprising:
a coating film formed by coating a fine cellulose fiber dispersion liquid, comprising at least a fine cellulose fiber and either an ammonia or an organic alkali, on at least one surface of a base material.

15. The laminate body according to claim 14 , wherein the coating film is an undercoat layer.

16. The fine cellulose fiber dispersion liquid according to claim 1 , wherein the pH of the fine cellulose fiber dispersion liquid is in a range of 8-12.

Assignees

• Saiki Akiko
• Oomori Yumiko
• Toppan Printing Co Ltd

Inventors

• Saiki Akiko
• Oomori Yumiko

Classifications

• C08B15/04

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

• C08J3/11 Primary

  from solid polymers · CPC title

• C08J3/05 Primary

  from solid polymers · CPC title

• C08L2203/16

  used for films · CPC title

• C08B15/02

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