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Absorbent article comprising a primary aqueous-liquid-absorbing agent

a technology of aqueous liquid and absorbent article, which is applied in the field of absorbent article, can solve the problems of poor performance of fibrous materials in these directions

Inactive Publication Date: 2007-08-30
NIPPON SHOKUBAI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a disposable absorbent article comprising an absorbent core that includes a primary aqueous-liquid-absorbing agent containing water-absorbent resin particles. The absorbent article has a high water absorption capacity and saline flow conductivity, and a wet porosity of not less than 20%. The absorbent article also comprises a topsheet, backsheet, and an absorbent core that may include an acquisition storage layer and optionally more absorbent layers. The absorbent core has a maximum dry caliper in the crotch region of 4.5 mm or less. The disposable absorbent article is thin and efficient in absorbing liquid.

Problems solved by technology

However, the fibrous materials are poor in these performances, particularly the performance of retaining the aqueous liquid, and have different performances from those of the conventional water-absorbent resin.

Method used

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  • Absorbent article comprising a primary aqueous-liquid-absorbing agent
  • Absorbent article comprising a primary aqueous-liquid-absorbing agent

Examples

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example 1

[0156]In a reactor as formed by lidding a jacketed stainless twin-arm kneader of 10 liters in capacity having two sigma-type blades, there was prepared a reaction liquid by dissolving 52.63 g (0.4 mol %) of polyethylene glycol diacrylate and 18.33 g (0.4 mol %) of D-sorbitol into 5,367.3 g of aqueous solution of sodium acrylate having a neutralization degree of 60 mol % (monomer concentration: about 40 weight %). Next, this reaction liquid was deaerated under an atmosphere of nitrogen gas for 20 minutes. Subsequently, 30.19 g of 10 weight % aqueous sodium persulfate solution and 25.16 g of 0.1 weight % aqueous L-ascorbic acid solution were added thereto under stirred conditions. As a result, polymerization started after about 1 minute. Then, the polymerization was carried out in the range of 20 to 95° C. while the forming gel was pulverized. Then, the resultant hydropolymer was got out after 30 minutes from the start of the polymerization. The resultant hydropolymer was in the form ...

example 2

[0161]A primary aqueous-liquid-absorbing agent (2) was obtained in the same way as of Example 1 except that: the perforation diameter of perforated plate in Example 1 was changed to 6.5 mm. The physical properties of the primary aqueous-liquid-absorbing agent (2) are shown in Table 1. Incidentally, the resultant primary aqueous-liquid-absorbing agent (2) had an extractable component content of 1.1 weight % and a bulk density of 5.8 g / ml.

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Abstract

An absorbent article comprising an absorbent core, which comprises at least one region comprising an aqueous-liquid-absorbing agent that contains water-absorbent resin particles, wherein the water-absorbent resin particles are obtained by a process including the step of polymerizing a water-soluble ethylenically unsaturated monomer having a carboxyl group, in the presence of an internal-crosslinking agent having at least four functional groups each capable of forming a covalent bond with a carboxyl group to thereby obtain a hydropolymer that is internally cross-linked and surface-crosslinked, the aqueous-liquid-absorbing agent being characterized by exhibiting a water absorption capacity (CRC) of 5 to 25 g / g and a saline flow conductivity (SFC) of not less than 1216 cm3·s·10-7 / g.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an absorbent article, such as a diaper or adult incontinence article or sanitary napkin, comprising a primary aqueous-liquid-absorbing agent comprising resin particles obtained by a process including the step of polymerizing a water-soluble ethylenically unsaturated monomer having a carboxyl group, in the presence of an internal-crosslinking agent having at least four functional groups each capable of forming a covalent bond with a carboxyl group, the aqueous-liquid-absorbing agent being characterized by exhibiting a water absorption capacity (CRC) of 5 to 25 g / g and a saline flow conductivity (SFC) of not less than 1216 cm3·s·10-7 / g.BACKGROUND OF THE INVENTION[0002]There have been continuous investigations to provide improved absorbent article with so-called super-absorbing resins or material or water-absorbing material or water-gelling material. Typically such articles need to that have a high absorption rate, absorption...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D04H1/00D04H13/00
CPCA61F13/15203A61L15/60A61F13/531Y10T442/699Y10T442/696
Inventor IKEUCHI, HIROYUKISAKAMOTO, SHIGERUMACHIDA, SYAKANAKAGAWA, YASUEBERUDA, HOLGER
Owner NIPPON SHOKUBAI CO LTD