Method for producing gel

Patent metadata

Field	Value
Publication number	US-10059812-B2
Application number	US-201515120555-A
Country	US
Kind code	B2
Filing date	Feb 24, 2015
Priority date	Feb 24, 2014
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

Method for producing a gel having a desired strength, by performing a step of removing a part or all of a solvent. Method for producing a gel containing a water-soluble organic polymer (A), a silicate salt (B), and a dispersant (C) for the silicate salt, including a desolvation step of removing a part or all of one or more solvents selected from the group consisting of water and a water-soluble organic solvent in the gel, or gelling a gel-forming composition containing the water-soluble organic polymer (A), the silicate salt (B), the dispersant (C) for the silicate salt, and one or more solvents selected from the group consisting of water and a water-soluble organic solvent and removing a part or all of the solvent in the composition.

First claim

The invention claimed is:

1. A method for producing a gel containing a water-soluble organic polymer (A), a silicate salt (B), and a dispersant (C) for the silicate salt, comprising
a desolvation step of removing a part or all of one or more solvents selected from the group consisting of water and a water-soluble organic solvent in the gel, or
gelling a gel-forming composition containing the water-soluble organic polymer (A), the silicate salt (B), the dispersant (C) for the silicate salt, and one or more solvents selected from the group consisting of water and a water-soluble organic solvent and removing a part or all of the solvent in the composition,
wherein the water-soluble organic polymer (A) is a fully or partially neutralized polyacrylate salt having a weight average molecular weight in a range of from 1,000,000 to 10,000,000.

2. The method for producing a gel according to claim 1 , wherein the silicate salt (B) is water-swellable silicate salt particles selected from the group consisting of smectite, bentonite, vermiculite, and mica.

3. The method for producing a gel according to claim 1 , wherein the dispersant (C) is one or more selected from the group consisting of sodium orthophosphate, sodium pyrophosphate, sodium tripolyphosphate, sodium tetraphosphate, sodium hexametaphosphate, sodium polyphosphate, sodium poly(meth)acrylate, ammonium poly(meth)acrylate, a sodium acrylate-sodium maleate copolymer, an ammonium acrylate-ammonium maleate copolymer, sodium hydroxide, hydroxylamine, sodium carbonate, sodium silicate, polyethylene glycol, polypropylene glycol, sodium humate, and sodium ligninsulfonate.

4. The method for producing a gel according to claim 1 , wherein the water-soluble organic solvent is methanol, ethanol, propanol, isopropyl alcohol, acetone, glycerin, ethylene glycol, or 1,3-butylene glycol.

5. The method for producing a gel according to claim 1 , wherein the water-soluble organic solvent is a polyhydric alcohol-based organic solvent.

6. The method for producing a gel according to claim 5 , wherein the polyhydric alcohol-based organic solvent is glycerin, ethylene glycol, or 1,3-butylene glycol.

7. The method for producing a gel according to claim 1 , wherein the desolvation step is a step of evaporating the solvent.

8. The method for producing a gel according to claim 1 , wherein the desolvation ratio of the solvent in the desolvation step is 25% or more on the basis of the mass of the solvent before desolvation.

9. The method for producing a gel according to claim 1 , wherein the desolvation ratio of the solvent in the desolvation step is set to 90% or more on the basis of the mass of the solvent before desolvation to produce a dried gel.

10. The method for producing a gel according to claim 1 , further comprising a solvent addition step of adding one or more solvents selected from the group consisting of water and a water-soluble organic solvent to the obtained gel after the desolvation step.

11. The method for producing a gel according to claim 10 , wherein the solvent addition step is a step of immersing the gel after the desolvation step in one or more solvents selected from the group consisting of water and a water-soluble organic solvent.

12. The method for producing a gel according to claim 10 , wherein the water-soluble organic solvent is methanol, ethanol, propanol, isopropyl alcohol, acetone, glycerin, ethylene glycol, or 1,3-butylene glycol.

13. The method for producing a gel according to claim 10 , wherein the water-soluble organic solvent is a polyhydric alcohol-based organic solvent.

14. The method for producing a gel according to claim 13 , wherein the polyhydric alcohol-based organic solvent is glycerin, ethylene glycol, or 1,3-butylene glycol.

15. A method for producing a powder comprising:
performing the method according to claim 9 to produce a dried gel, and pulverizing the dried gel.

Assignees

• Nissan Chemical Ind Ltd

Inventors

• Kudo Yoshihiro

Classifications

• C08J3/075 Primary

  Macromolecular gels · CPC title

• A61K8/345

  containing more than one hydroxy group · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title

• A61L27/46

  with phosphorus-containing inorganic fillers · CPC title

• A61L15/24

  Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof {(A61L15/225 takes precedence)} · CPC title