# US 8,540,945 B2 · Water absorbing material and manufacturing method therefor

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- Number: US 8,540,945 B2
- Document ID: US8540945B2
- Status: Granted
- Kind: B2
- Application number: 13/632,555
- Filed: 2012-10-01
- Published: 2013-01-31
- Granted: 2013-09-24
- Earliest claimed: 2010-02-25
- Assignees: Daiki Co., Ltd.
- Applicants: Hiroshi Ito; Shinobu Hatanaka; Takahiro Hosoya
- Inventors: Hiroshi Ito; Shinobu Hatanaka; Takahiro Hosoya
- Web page: https://patentgrep.com/patent/US8540945B2

## CPC

- A01K 1/0152: {Litter}
- B01J 20/103: {comprising silica}
- B01J 20/16: Alumino-silicates (B01J20/12 takes precedence)
- B01J 20/28061: {being in the range 100-500 m2/g}
- B01J 20/28064: {being in the range 500-1000 m2/g}
- B01J 20/28071: {being less than 0.5 ml/g}
- B01J 20/28073: {being in the range 0.5-1.0 ml/g}
- B01J 20/2808: {being less than 2 nm, i.e. micropores or nanopores}
- B01J 20/28083: {being in the range 2-50 nm, i.e. mesopores}
- B01J 20/3028: {Granulating, agglomerating or aggregating}
- B01J 20/3293: {Coatings on a core, the core being particle or fiber shaped, e.g. encapsulated particles, coated fibers}
- G01N 31/221: {for investigating pH value}
- B01J 2220/46: Materials comprising a mixture of inorganic and organic materials (materials coated or impregnated on a carrier B01J20/32)
- B01J 2220/4875: the starting material being a waste, residue or of undefined composition
- B01J 2220/49: Materials comprising an indicator, e.g. colour indicator, pH-indicator
- A01K: ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

Provided is a water absorbing material having a granular core portion and a coating layer portion coating the granular core portion, which does not produce color before use and with which a test result can be determined only after use. In the water absorbing material, the coating layer portion is composed of 90 wt % to 96 wt % of a substrate and 10 wt % to 4 wt % of an excretion test material, the excretion test material contains a porous adsorbent having an adsorbance of 25 wt % or greater and including micropores, and an excretion test indicator adsorbed on the micropores of the porous adsorbent, and the excretion test indicator is added in an amount in the range of 0.015 wt % to 0.10 wt % relative to the total amount of the coating layer portion.

## Claims

### Claim 1

A method for producing a multi-layer water absorbing material comprising a granular core portion for absorbing moisture from outside and a coating layer portion coating the granular core portion, the coating layer portion containing an excretion test indicator being a reagent that changes its color upon reaction with excretion,
the method comprising:
a granulation step of producing the granular core portion,
an excretion test indicator adsorption step of dissolving the excretion test indicator in a solvent for dissolving the excretion test indicator and allowing the dissolved excretion test indicator to be adsorbed on a porous adsorbent having an adsorbance of 25 wt % or greater and including micropores,
a coating material production step of adding the excretion test indicator adsorbed, by the excretion test indicator adsorption step, on the porous adsorbent to a substrate to produce a coating material that constitutes the coating layer portion, and
a coating step of coating the granular core portion with the coating material.

### Claim 2 (depends on 1)

The method for producing the water absorbing material according to claim 1, wherein the substrate has a function of causing grains of the water absorbing material which grains are wet with excretion to adhere to each other so as to form an aggregate.

### Claim 3 (depends on 1)

The method for producing the water absorbing material according to claim 1, wherein the substrate hides a color of the granular core potion before use.

### Claim 4 (depends on 1)

The method for producing the water absorbing material according to claim 1, wherein the porous adsorbent is type B silica gel.

### Claim 5 (depends on 1)

The method for producing the water absorbing material according to claim 1, wherein a plurality of different types of the excretion test indicators are dissolved in the solvent and the dissolved excretion test indicators are adsorbed on the porous adsorbent in the excretion test indicator adsorption step.

### Claim 6 (depends on 1)

The method for producing the water absorbing material according to claim 1, wherein the coating step of coating a periphery of the granular core portion.

### Claim 7 (depends on 5)

The method for producing the water absorbing material according to claim 5, wherein the plurality of different types of the excretion test indicators include at least two from the group consisting of a urinary pH value detection indicator, a urinary glucose detection indicator, a urinary protein detection indicator, a urinary occult blood detection indicator, and a urinary urobilinogen detection indicator.