Hydrogel forming composition and hydrogel produced therefrom

Patent metadata

Field	Value
Publication number	US-9238718-B2
Application number	US-201314429234-A
Country	US
Kind code	B2
Filing date	Sep 18, 2013
Priority date	Sep 18, 2012
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

There is provided a self-supporting hydrogel that can be produced only through mixing at room temperature and that has a high mechanical strength. A hydrogel forming composition that is capable of forming a hydrogel having a self-supporting property, the hydrogel forming composition characterized by including: a water-soluble organic polymer having an organic acid salt structure or an organic acid anion structure; a silicate salt; a dispersant for the silicate salt; and a polyhydric alcohol, and having an extremely high mechanical strength.

First claim

The invention claimed is:

1. A hydrogel forming composition that is capable of forming a hydrogel having a self-supporting property, the hydrogel forming composition characterized by comprising:
a water-soluble organic polymer having an organic acid salt structure or an organic acid anion structure;
a silicate salt;
a dispersant for the silicate salt; and
a polyhydric alcohol.

2. The hydrogel forming composition according to claim 1 , wherein
the polyhydric alcohol is selected from the group consisting of glycerin, diglycerin, ethylene glycol, propylene glycol, butylene glycols, polyethylene glycol, and polypropylene glycol.

3. The hydrogel forming composition according to claim 1 , wherein
the water-soluble organic polymer is a water-soluble organic polymer compound having a carboxylate salt structure or a carboxy anion structure.

4. The hydrogel forming composition according to claim 3 , wherein
the water-soluble organic polymer compound is a fully neutralized or partially neutralized polyacrylate salt.

5. The hydrogel forming composition according to claim 4 , wherein
the water-soluble organic polymer compound is a fully neutralized or partially neutralized polyacrylate salt having a weight average molecular weight of 1,000,000 to 10,000,000.

6. The hydrogel forming composition according to claim 1 , wherein
the silicate salt is a water-swellable silicate salt particle.

7. The hydrogel forming composition according to claim 6 , wherein
the silicate salt is a water-swellable silicate salt particle selected from the group consisting of smectite, bentonite, vermiculite, and mica.

8. The hydrogel forming composition according to claim 1 , wherein
the dispersant is a dispersant for a water-swellable silicate salt particle.

9. The hydrogel forming composition according to claim 8 , wherein
the dispersant is one or two or more compounds selected from the group consisting of sodium orthophosphate, sodium pyrophosphate, sodium tripolyphosphate, sodium tetraphosphates, sodium hexametaphosphate, sodium polyphosphates, sodium poly(meth)acrylate, ammonium poly(meth)acrylate, poly(sodium acrylate-co-sodium maleate), poly(ammonium acrylate-co-ammonium maleate), sodium hydroxide, hydroxyamine, sodium carbonate, sodium silicate, polyethylene glycols or polypropylene glycols having a weight average molecular weight of from 200 to 20,000, sodium humate, and sodium ligninsulfonate.

10. A hydrogel having a self-supporting property, formed of the hydrogel forming composition as claimed in claim 1 .

11. The hydrogel according to claim 10 , wherein
10% by mass or more of a polyhydric alcohol is contained relative to 100% by mass of the hydrogel.

Assignees

• Nissan Chemical Ind Ltd
• Riken

Inventors

• Kudo Yoshihiro
• Nakazawa Taichi
• Aida Takuzo
• Ishida Yasuhiro
• Tamesue Shingo
• Ohtani Masataka

Classifications

• C08L33/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title

• C08L83/02

  Polysilicates · CPC title

• C08L33/06

  of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical · CPC title

• C08J3/075 Primary

  Macromolecular gels · CPC title

• C08K5/053

  Polyhydroxylic alcohols · CPC title