Complexes of hydrotalcites and fibers

Patent metadata

Field	Value
Publication number	US-11077033-B2
Application number	US-201716318368-A
Country	US
Kind code	B2
Filing date	Aug 10, 2017
Priority date	Aug 10, 2016
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

The present invention aims to provide techniques for preparing complexes of a hydrotalcite and a fiber. The complexes of a hydrotalcite and a fiber can be synthesized efficiently by synthesizing the hydrotalcite in an aqueous system in the presence of the fiber.

First claim

The invention claimed is:

1. A process for preparing a complex of a hydrotalcite and a cellulose fiber, wherein 60% or more of the surface of the cellulose fiber is covered with the hydrotalcite, and a proportion of hydrotalcite in the complex is 10% or more, comprising synthesizing the hydrotalcite in a solution containing the cellulose fiber, wherein the hydrotalcite is synthesized by:
(a) immersing the cellulose fiber in an alkaline solution, and then adding an acid solution to the immersed cellulose fiber; or
(b) immersing the cellulose fiber in an acid solution, and then adding an alkaline solution to the immersed cellulose fiber,
wherein the acid solution contains a divalent metal ion and a trivalent metal ion.

2. The process of claim 1 , further comprising adding a solution containing an anionic material to the complex of a hydrotalcite and a cellulose fiber.

3. The process of claim 2 , wherein the solution containing an anionic material is a copper- or silver-containing thiosulfato complex solution.

4. The process of claim 1 , wherein the divalent metal ion in the acid solution is magnesium or zinc.

5. The process of claim 1 , wherein the trivalent metal ion in the acid solution is aluminum.

6. The process of claim 1 , wherein the complex of a hydrotalcite and a cellulose fiber contains 10% or more of magnesium or zinc based on the ash content.

7. The process of claim 1 , wherein the proportion of hydrotalcite in the complex is 20% or more.

8. The process of claim 1 , wherein the proportion of hydrotalcite in the complex is 40% or more.

Assignees

• Jujo Paper Co Ltd

Inventors

• Oishi Masatoshi
• Sugawara Naoyuki
• Goto Shisei

Classifications

• D21H17/63 Primary

  Inorganic compounds · CPC title

• C01F7/785

  Hydrotalcite · CPC title

• D06M11/44

  Oxides or hydroxides of elements of Groups 2 or 12 of the Periodic Table; Zincates; Cadmates · CPC title

• C01P2006/10

  Solid density · CPC title

• D21H13/00

  Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material (chemical features in the manufacture of artificial fibres D01F) · CPC title