# US 10,973,707 B2 · Water absorption treatment material comprising granular core and coating containing polymer particles therein

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- Number: US 10,973,707 B2
- Document ID: US10973707B2
- Status: Granted
- Kind: B2
- Application number: 16/020,355
- Filed: 2018-06-27
- Published: 2018-10-25
- Granted: 2021-04-13
- Earliest claimed: 2016-02-01
- Assignees: Daiki Co., Ltd.
- Applicants: Daiki Co., Ltd.
- Inventors: Hiroshi Ito; Junji Yoshinaga
- Web page: https://patentgrep.com/patent/US10973707B2

## CPC

- A61F 13/53752: {the layer is embedded in the absorbent core}
- A01K 1/0155: {comprising organic material}
- A61F 13/15252: {compostable or biodegradable}
- A61F 2013/1526: {compostable}
- A61F 2013/530007: {being made from pulp}
- A61F 2013/530189: {with thermoplastic adhesive}
- A61F 2013/530613: {in fibres}
- Y10T 428/2998: including synthetic resin or polymer
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- A01K: ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention provides a water absorption treatment material that has a structure suitable for obtaining a high level of water disintegrability. A water absorption treatment material is a water absorption treatment material that absorbs a liquid, and includes a granular core portion and a coating layer portion. The granular core portion has a granular shape. The granular core portion contains a first water-absorbent polymer. The coating layer portion covers the granular core portion. The coating layer portion contains a second water-absorbent polymer. The second water-absorbent polymer has a mean particle size smaller than the mean particle size of the first water-absorbent polymer.

## Claims

### Claim 1

A water absorption treatment material that absorbs a liquid, the water absorption treatment material comprising:
a granular core portion that has a granular shape, and contains a first water-absorbent polymer; and
a coating layer portion that is provided so as to cover the granular core portion, and contains a second water-absorbent polymer,
wherein:
the first water-absorbent polymer has a mean particle size of greater than 20 μm and not greater than 50 μm, and
the second water-absorbent polymer has a mean particle size smaller than the mean particle size of the first water-absorbent polymer.

### Claim 2 (depends on 1)

The water absorption treatment material according to claim 1, wherein the second water-absorbent polymer has a mean particle size of 20 μm or less.

### Claim 3 (depends on 2)

The water absorption treatment material according to claim 2, wherein the second water-absorbent polymer has a mean particle size of 10 μm or less.

### Claim 4 (depends on 1)

The water absorption treatment material according to claim 1, wherein the second water-absorbent polymer is a water-absorbent polymer that has been pulverized using a fine pulverizer.

### Claim 5 (depends on 1)

The water absorption treatment material according to claim 1, wherein a main material of the granular core portion is paper, used tea leaves, or plastics.

### Claim 6 (depends on 5)

The water absorption treatment material according to claim 5, wherein the main material of the granular core portion has a particle size of 0.3 mm or less.

### Claim 7 (depends on 5)

The water absorption treatment material according to claim 5, wherein the main material of the granular core portion is the paper, and the paper is a papermaking sludge that has been pulverized with a water content of 40 wt % or more.

### Claim 8 (depends on 5)

The water absorption treatment material according to claim 5, wherein the main material of the granular core portion is the used tea leaves, and the used tea leaves are used tea leaves that have been pulverized with a water content of 45 wt % or more.

### Claim 9 (depends on 1)

The water absorption treatment material according to claim 1, wherein a main material of the granular core portion is bean curd lees.

### Claim 10 (depends on 1)

The water absorption treatment material according to claim 1, wherein a weight ratio of the coating layer portion in the water absorption treatment material is 5% or more and less than 10%.

### Claim 11 (depends on 1)

The water absorption treatment material according to claim 1, wherein the granular core portion is visible through the coating layer portion before the water absorption treatment material absorbs the liquid.