Particulate water absorbing agent with water-absorbing resin as main component

a technology of water-absorbing resin and absorbing agent, which is applied in the field of particulate water absorbing agent, can solve the problems of not satisfactorily fulfilling performance and not reaching practically sufficient performan

Inactive Publication Date: 2007-03-22
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] Among water-absorbing resins or water absorbing agents which have been developed based on many properties, as described above, those targeted to or with specifications of these properties have also been produced, however, there was a problem that they have not yet satisfactorily fulfilled performance in practical use such as a paper diaper, and the like, even if these properties are controlled.
[0011] Practically sufficient performance has not ye

Problems solved by technology

Among water-absorbing resins or water absorbing agents which have been developed based on many properties, as described above, those targeted to or with specifications of these properties have also been produced, however, there was a problem that they have not yet satisfactorily fulfilled performance in practical use such as a paper diaper, and the like, even if the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0253] Polyethylene glycol diacrylate (average added mole number of ethylene oxide unit: 9) of 4.3 g was dissolved in 1,500 g of an aqueous solution of sodium acrylate having neutralization ratio of 75% by mole (monomer concentration: 24% by weight) to make reaction liquid. Thus obtained reaction liquid was poured into a tray with length of 320 mm, width of 220 mm and height of 50 mm made of stainless steel, with the reaction liquid being 17 mm deep. The stainless steel tray was immersed in a water bath at 30° C., after the top of the tray was sealed with a polyethylene film having a nitrogen gas inlet, an exhaust gas outlet and an inlet of a polymerization initiator. Nitrogen gas was introduced into the reaction liquid to purge dissolved oxygen in the liquid, while controlling the reaction liquid temperature at 30° C. Subsequently, nitrogen gas continued to be introduced in an upper space of the reactor, while exhausting from the other side. The reaction liquid was added with, as p...

reference example 2

[0255] Polyethylene glycol diacrylate (average added mole number of ethylene oxide unit: 9) of 4.0 g was dissolved in 5,500 g of an aqueous solution of sodium acrylate having neutralization ratio of 75% by mole (monomer concentration: 40% by weight) to make reaction liquid. Subsequently, a reactor fabricated by attaching a lid to a 10-L twin-arm type kneader made of stainless steel and equipped with a jacket and two Σ-shaped agitating blades was supplied the reaction liquid and the reaction system was purged dissolved oxygen by introducing with nitrogen gas, while keeping the reaction liquid at 30° C. The reaction liquid was then added with 29.8 g of a 10% by weight aqueous solution of sodium persulfate and 1.5 g of a 1% by weight aqueous solution of L-ascorbic acid, while stirring the reaction liquid, resulting in initiation of polymerization after 1 minute. Peak temperature of polymerization of 93° C. was attained after 15 minutes from initiation of polymerization. After 60 minute...

reference example 3

[0257] Polyethylene glycol diacrylate (average added mole number of ethylene oxide unit: 9) of 2.5 g was dissolved in 5,500 g of an aqueous solution of sodium acrylate having neutralization ratio of 75% by mole (monomer concentration: 38% by weight) to make reaction liquid. After purging dissolved oxygen similarly as in Reference Example 2, the reaction liquid was supplied to the reactor of Reference Example 2 and the reaction system was purged with nitrogen gas, while keeping the reaction liquid at 30° C. The reaction liquid was then added with 29.8 g of a 10% by weight aqueous solution of sodium persulfate and 1.5 g of a 1% by weight aqueous solution of L-ascorbic acid, while stirring the reaction liquid, resulting in initiation of polymerization after about 1 minute. Peak temperature of polymerization of 86° C. was attained after 17 minutes from initiation of polymerization. After 60 minutes from initiation of polymerization, a hydrated gel-like polymer was taken out, which was i...

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Abstract

The present invention provides a water absorbing agent which maintains excellent water absorbing properties for a long time, even when urine composition of human urine varies depending. A particulate water absorbing agent comprising a water-absorbing resin obtained by crosslinking polymerization of an unsaturated monomer, which exhibits Centrifuge retention capacity in a physiological saline solution of not lower than 32 g/g, mass median particle size (D50) of 200 to 400 μm, ratio of particles with diameter of smaller than 150 μm of 0 to 2% by weight, and increased extractables by deterioration of 0 to 15% by weight and extractables for one hour in deterioration test liquid of 0.1 to 30% by weight.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a particulate water absorbing agent including a water-absorbing resin as a main component. In particular, it relates to a particulate water absorbing agent fulfilling superior absorption ability conventionally not obtained in practical applications as absorbing articles such as a diaper. [0003] 2. Description of Related Art [0004] At present, as component materials in sanitary goods such as a paper diaper, a sanitary napkin, an incontinence pad, and the like, a water-absorbing resin to absorb body fluid and hydrophilic fibers such as pulp are widely used. As the water-absorbing resin, for example, partially neutralized and crosslinked polyacrylic acid, hydrolysates of starch-acrylic acid graft polymer, saponified vinyl acetate-acrylic acid ester copolymers, hydrolysates of acrylonitrile copolymers or acrylamide copolymers or crosslinked polymers thereof, crosslinked polymers of catio...

Claims

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Application Information

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IPC IPC(8): B32B5/02A61L15/60C08J3/12C08J3/24
CPCC08J3/12C08J3/245C08J2300/14Y10T428/2991Y10T428/254Y10T428/2982Y10T428/2998Y10T428/249924Y10T442/2344A61L15/60C08J3/075
Inventor WADA, KATSUYUKIKIMURA, KAZUKIUEDA, HIROKOKANTO, TERUYUKIFUJIMARU, HIROTAMA
Owner NIPPON SHOKUBAI CO LTD
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