WATER-ABSORBING RESIN COMPOSITION

• US 20190338082A1
• Filed: 09/29/2017
• Published: 11/07/2019
• Est. Priority Date: 09/30/2016
• Status: Active Grant

• Current Assignee: Nippon Shokubai Company Limited
• Original Assignee: Nippon Shokubai Company Limited
• Inventors: IWAMURA, Taku, NAKAJIMA, Yasuhisa, TORII, Kazushi, FUJIMOTO, Taku, KAWADA, Hiroki
• Granted Patent: US 10,961,358 B2
• Time in Patent Office: Days
• CPC Class Codes: A61L 15/22 containing macromolecular materials
• CPC Class Codes: A61L 15/48 Surfactants
• CPC Class Codes: C08J 2300/12 Polymers characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity
• CPC Class Codes: C08J 2333/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08J 3/075 Macromolecular gels
• CPC Class Codes: C08J 3/12 Powdering or granulating
• CPC Class Codes: C08J 3/24 Crosslinking, e.g. vulcanising, of macromolecules mechanical aspects B29C35/00; crosslinking agents C08K
• CPC Class Codes: C08J 3/245 Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking
• CPC Class Codes: C08K 5/09 Carboxylic acids; Metal salts thereof; Anhydrides thereof
• CPC Class Codes: C08L 101/14 the macromolecular compounds being water soluble or water swellable, e.g. aqueous gels

Abstract

To provide a water-absorbing resin composition having both a high centrifuge retention capacity (CRC) and a sufficient urine resistance and a method for producing such a water-absorbing resin composition, an aspect of the present invention is a water-absorbing resin composition having the following properties: (1) A centrifuge retention capacity (CRC) being not less than 35 g/g; (2) A post-degradation-test one-hour eluted soluble component being not more than 19% by mass; (3) An absorbency against pressure 0.7 psi (AAP0.7) being not less than 10 g/g; and (4) A content of a water-absorbing resin in dust being not more than 300 ppm with respect to a total mass of the water-absorbing resin composition.

Claims

1. A water-absorbing resin composition having following properties:

(1) A centrifuge retention capacity (CRC) being not less than 35 g/g;

(2) A post-degradation-test one-hour eluted soluble component being not more than 19% by mass;

(3) An absorbency against pressure 0.7 psi (AAP0.7) being not less than 10 g/g; and

(4) A content of a water-absorbing resin in dust being not more than 300 ppm with respect to a total mass of the water-absorbing resin composition.

2. The water-absorbing resin composition according to claim 1, comprising:

a chelating agent in an amount of not less than 0.0001 parts by mass and not more than 1.0 part by mass with respect to 100 parts by mass of the water-absorbing resin composition.

3. The water-absorbing resin composition according to claim 1, comprising:

a surfactant and/or a lubricant.

4. The water-absorbing resin composition according claim 1, wherein

the water-absorbing resin composition has a surface tension of not less than 65 mN/m.

5. The water-absorbing resin composition according to claim 1, wherein

the water-absorbing resin composition has a moisture content of not more than 5% by mass.

6. The water-absorbing resin composition according to claim 1, comprising:

a polyvalent metal salt and/or an inorganic fine particle.

7. The water-absorbing resin composition according to claim 1, wherein

the water-absorbing resin composition has a vertical diffusing absorbency under pressure 0.3 psi (VDAUP0.3) of not less than 10 g/g.

8. The water-absorbing resin composition according to claim 1, wherein

the water-absorbing resin composition includes a surface-eluted soluble component of not more than 2.0% by mass.

9. The water-absorbing resin composition according to claim 1, wherein

a proportion of a particle capable of passing through a classification mesh having a mesh size of 150 μ

m is not more than 5% by mass with respect to the total mass of the water-absorbing resin composition.

10. The water-absorbing resin composition according to claim 1, wherein

in a case where a droplet of a 0.9 mass % aqueous sodium chloride solution has been dropped on the water-absorbing resin composition, a contact angle is not more than 90 degrees.

11. The water-absorbing resin composition according to claim 1, wherein

the water-absorbing resin composition is a particulate water-absorbing resin composition including a polyacrylic acid (salt)-based water-absorbing resin particle in an amount within a range of 60 parts by mass to 100 parts by mass with respect to 100 parts by mass as the total mass of the water-absorbing resin composition.

12. A sanitary product, comprising:

a water-absorbing resin composition according to claim 1.