Complex, method for producing complex, dispersion liquid, method for producing dispersion liquid, and optical material

Patent metadata

Field	Value
Publication number	US-9987686-B2
Application number	US-201615345028-A
Country	US
Kind code	B2
Filing date	Nov 7, 2016
Priority date	May 9, 2014
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A complex includes a flat plate-like metal fine particle formed of at least one type of metal or a compound thereof and at least one piece of finely-disintegrated cellulose combined with the flat plate-like metal fine particle. At least a part of each piece of the finely-disintegrated cellulose is incorporated into the flat plate-like metal fine particle, and a remaining part is exposed from a surface of the flat plate-like metal fine particle.

First claim

What is claimed is:

1. A complex comprising:
a flat plate-like metal fine particle formed of at least one metal or metal species; and at least one piece of finely-disintegrated cellulose combined with the flat plate-like metal fine particle,
wherein at least a part of each piece of the finely-disintegrated cellulose is incorporated into the flat plate-like metal fine particle, and a remaining part is exposed from a surface of the flat plate-like metal fine particle,
wherein a method for producing the complex of the plate-like metal fine particle and the finely-disintegrated cellulose, comprising the steps of:
preparing finely-disintegrated cellulose;
dispersing the finely-disintegrated cellulose in a solvent to obtain a finely-disintegrated cellulose dispersion liquid;
mixing the finely-disintegrated cellulose dispersion liquid with a solution containing metal ions to obtain a mixed solution;
reducing and precipitating the metal ions in the mixed solution to grow the flat plate-like metal fine particle, and combining the flat plate-like metal fine particle and the finely-disintegrated cellulose with each other;
wherein the finely-disintegrated cellulose has a content of carboxyl group between 0.1 mmol or more and 5.0 mmol or less per 1.0 g of cellulose on a crystal surface of the finely-disintegrated cellulose, and an amount of the metal ions during the reduction and precipitation step is 0.002 mmol or more and 0.1 mmol or less with respect to 1.0 g of the finely-disintegrated cellulose, and
wherein the finely-disintegrated cellulose dispersion liquid has a maximum value of absorbance with respect to a given wavelength in a range of a wavelength of 400 nm or more and 1500 nm or less.

2. The complex of claim 1 , wherein the flat plate-like metal fine particle and the finely-disintegrated cellulose are inseparable.

3. The complex of claim 1 , wherein the flat plate-like metal fine particle is silver.

4. The complex of claim 1 , wherein the flat plate-like metal fine particle has a particle diameter that is two times or more larger than a particle thickness of the flat plate-like metal fine particle.

5. The complex of claim 1 , wherein the finely-disintegrated cellulose has a crystal structure of cellulose type I.

6. The complex of claim 1 ,
wherein the finely-disintegrated cellulose has a fibrous form derived from a microfibril structure of native cellulose.

7. The complex of claim 1 ,
wherein the finely-disintegrated cellulose has a number average minor axis diameter of 1 nm or more and 100 nm or less, and a number average major axis diameter of 50 nm or more, the number average major axis diameter being 10 times or more longer than the number average minor axis diameter.

8. A dispersion liquid including the complex of claim 1 , the complex being dispersed in water or an organic solvent.

9. An optical material including the complex of claim 1 .

10. The complex of claim 1 , wherein the carboxyl group is introduced by an oxidation reaction using an N-oxyl compound.

Assignees

• Toppan Printing Co Ltd

Inventors

• Isogai Takuya

Classifications

• D21H15/02

  characterised by configuration · CPC title

• D21H11/16

  modified by a particular after-treatment · CPC title

• D06M11/83

  with metals; with metal-generating compounds, e.g. metal carbonyls; Reduction of metal compounds on textiles · CPC title

• B22F9/24 Primary

  starting from liquid metal compounds, e.g. solutions · CPC title

• Y10S977/773

  Nanoparticle, i.e. structure having three dimensions of 100 nm or less · CPC title