# US 2014/0197360 A1 · Production method for water-absorbing resin composition

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0197360 A1
- Document ID: US20140197360A1
- Status: Published application
- Kind: A1
- Application number: 14/218,433
- Filed: 2014-03-18
- Published: 2014-07-17
- Earliest claimed: 2006-03-27
- Assignees: Nippon Shokubai Co., Ltd.
- Applicants: Nippon Shokubai Co., Ltd.
- Inventors: Takahiro KITANO; Yorimichi DAIROKU; Sumio OKUDA; Kozo NOGI; Motohiro IMURA
- Web page: https://patentgrep.com/patent/US20140197360A1

## CPC

- A61L 15/22: containing macromolecular materials
- A61L 15/60: Liquid-swellable gel-forming materials, e.g. super-absorbents
- C08J 3/203: {Solid polymers with solid and/or liquid additives}
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

A method for being capable of sufficiently exerting property improvement effect by the addition of additive particles other than water-absorbing resin to water-absorbing resin particles. The problems can be solved by using additive particles having over cohesive particles in an amount equal to or less than a predetermined amount, or by using the additive particles by crushing or classifying in advance, before mixing with water-absorbing resin particles. Alternatively, the problem can be solved by subjecting a mixture of the water-absorbing resin particles and the additive particles to pneumatic transportation processing, in particular, in a heated state, after mixing or at the same time as mixing. Further, provided is a water-absorbing resin composition, which is capable of stably exerting high-level property. The problems can be solved by a water-absorbing resin composition, where the addition amount of additive particles and amount of free additive particles satisfies a predetermined relation.

## Claims

### Claim 1

A water-absorbing resin composition comprising 100 parts by weight of water-absorbing resin particles and 0.01 to 1 part by weight of additive particles, wherein a percent by weight of the additive particles, (x [%]), based on 100% by weight of the water-absorbing resin particles in the composition, and weight ratio of free additive particles, (y), relative to the percent by weight, (x [%]), satisfy the following formula:
0.04(x)0.1≦y≦0.2(x)0.5.

### Claim 2 (depends on 1)

The water-absorbing resin composition according to claim 1, wherein the ratio of content of the additive particles in the composition is larger than 0.2% by weight.

### Claim 3 (depends on 1)

The water-absorbing resin composition according to claim 1, wherein the additive particles are water-insoluble.

### Claim 4 (depends on 1)

The water-absorbing resin composition according to claim 1, wherein the additive particles are cohesive fine particles.

### Claim 5 (depends on 4)

The water-absorbing resin composition according to claim 4, wherein the cohesive fine particles are amorphous silica fine particles.

### Claim 6 (depends on 1)

The water-absorbing resin composition according to claim 1, wherein centrifuge retention capacity of the water-absorbing resin particles to an aqueous solution of sodium chloride of 0.90% by weight is equal to or larger than 25 [g/g], and absorbency against pressure at 0.3 psi is equal to or larger than 10 [g/g].