JP2009005767A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article for which a liquid absorption speed is high, spot absorptivity is excellent and a liquid return amount is small. <P>SOLUTION: The absorbent article of this invention includes a highly water absorptive polymer 43 and contains 1.5 to 15 pts.wt. of one or two or more surfactants selected from a group consisting of sugar alkyl ether and sugar fatty acid ester to 100 pts.wt. of the highly water absorptive polymer. The surfactant is present on the surface and/or in the inside of the highly water absorptive polymer 43 for instance. The surfactant may be present adjacently to the highly water absorptive polymer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an absorbent article.

In an absorbent article such as a sanitary napkin, menstrual blood or the like absorbed by the absorbent body from the skin contact surface may return to the skin contact surface due to pressurization or the like and become sticky.
As a method for reducing stickiness, an unevenness is provided on the surface sheet that forms the skin contact surface to reduce the contact area with the skin, or a bulky nonwoven fabric is used for the surface sheet.
Moreover, in absorbent articles, in order to improve the absorption performance of the absorber, improvement of the superabsorbent polymer used in the absorber, modification of the retention mode of the superabsorbent polymer in the absorber, the three-dimensional structure of the absorber, etc. Studies on these are also being conducted.
However, the performance required for the absorbent article is increasing year by year, and there is a possibility that the conventional method cannot sufficiently meet future demands.

  Patent Document 1 describes a water-decomposable sheet in which a mixed material having a melting point peak temperature of two or more points is applied to at least a surface of the base sheet having water-decomposability that is in contact with the skin. A sucrose ester is described as an example of the component. However, in the invention described in Patent Document 1, in order to improve the moist feeling when touching the skin, a mixed material having two or more melting point peaks is applied to the base sheet. No mention is made regarding the use of the water-decomposable sheet at a site other than the skin contact surface in the absorbent article.

JP 2005-290618 A

  An object of the present invention is to provide an absorbent article that has a high liquid absorption rate, is excellent in spot absorbability, and has a low liquid return amount.

  The present invention includes a superabsorbent polymer and 1.5 or more surfactants selected from the group consisting of sugar alkyl ethers and sugar fatty acid esters with respect to 100 parts by weight of the superabsorbent polymer. The object is achieved by providing an absorbent article containing -15 parts by weight.

  The absorbent article of the present invention has a high liquid absorption rate, excellent spot absorptivity, and a low liquid return amount.

The present invention will be described below based on preferred embodiments with reference to the drawings.
As shown in FIG. 1, a sanitary napkin 1 (hereinafter also referred to as napkin 1) as an embodiment of the present invention includes a liquid-permeable surface sheet 2 that forms a skin contact surface 20, a liquid-impermeable or A water-repellent leak-proof sheet 3 and an absorbent body 4 positioned between the two sheets 2 and 3 are provided, and a second sheet (intermediate layer) 5 is provided between the top sheet 2 and the absorbent body 4.
The absorbent body 4 includes a fiber aggregate 42 made of pulp fibers and an absorbent core 41 made of a superabsorbent polymer 43, a covering sheet 44 that covers the skin contact surface side of the absorbent core 41, and the absorbent core 41. And a covering sheet 45 that covers the non-skin contact surface side. The covering sheet 44 and the covering sheet 45 may be a single continuous sheet or two separate sheets.

The napkin 1 includes cellulosic hydrophilic fibers containing one or more surfactants selected from the group consisting of sugar alkyl ethers and sugar fatty acid esters at sites other than the skin contact surface 20.
Specifically, the surfactant is contained in the absorbent core 41 composed of the fiber assembly 42 and the superabsorbent polymer 43.

In addition, the skin contact surface 20 is a surface contact | abutted to a wearer's skin at the time of wear, and the non-skin contact surface 30 is a surface turned to the wearer's skin at the time of wear. .
The site other than the skin contact surface is a purpose of excluding the surface on the skin contact surface 20 side of the sheet forming the skin contact surface 20 (surface sheet 2 in the present embodiment). When the layer has a multilayer structure, among the layers constituting the top sheet 2, layers other than the outermost layer forming the skin contact surface 20 are included in portions other than the skin contact surface. Furthermore, when the sheet | seat which forms the skin contact surface 20 is a single layer sheet, the back surface (surface on the opposite side to a skin contact surface) of this sheet | seat is contained in parts other than a skin contact surface.
When the skin contact surface 20 is treated with the above-described surfactant, the excretory fluid easily flows (laterally diffuses) on the surface of the top sheet 2, and the excretory fluid is difficult to enter the absorber 4. Since it becomes easy to generate | occur | produce, it is not preferable.

The surfactant used in the present invention is a sugar alkyl ether and / or a sugar fatty acid ester.
The sugar alkyl ether has a structure in which a sugar residue and an alkyl group are single-bonded to oxygen. When G is a sugar residue and R ₁ is an alkyl group, the sugar alkyl ether can be represented by the general formula G—O—R _1. it can.
Examples of sugar alkyl ethers include monosaccharides or polysaccharide alkyl ethers obtained by condensing two or more monosaccharides. From the viewpoint of spot absorbability, monosaccharides or C1-C60 alkyl ethers of polysaccharides condensed with 2 to 30 monosaccharides are preferred, and alkyl glucosides in which the sugar component is a monosaccharide are more preferred.

  As the alkyl glucoside, those having 1 to 22 carbon atoms in the alkyl group are preferable in terms of spot absorbability and liquid absorption rate, more preferably those having 4 to 18 carbon atoms, and more preferably 8 to 14 carbon atoms in the alkyl group. It is. The alkyl group may be linear or branched. The alkyl chain length may be distributed, but those having an alkyl chain length in the above range are preferably present in an amount of 60 wt% or more based on the total alkyl groups.

Moreover, the etherification degree of alkyl glucoside is, when the etherification degree is 100% when all five hydroxyl groups present in one glucose molecule are alkyl etherified,
It is preferably a single compound or a mixture having a degree of etherification in the range of 2 to 60%, more preferably from 5 to 45%, and still more preferably from 15 to 35%, from the viewpoint of liquid absorption rate and spot absorbability. It is.

  The sugar fatty acid ester is a nonionic surfactant in which a sugar and a saturated fatty acid or an unsaturated fatty acid are ester-bonded, and examples thereof include a fatty acid ester of a polysaccharide in which two or more monosaccharides or monosaccharides are condensed. From the viewpoint of spot absorptivity, a monosaccharide or a fatty acid ester having 1 to 60 carbon atoms of a polysaccharide condensed with 2 to 30 monosaccharides is preferable, and a fatty acid ester of sucrose which is a disaccharide is more preferable.

The constituent fatty acid of the sucrose fatty acid ester may be an alkyl group or an alkenyl group having an alkyl group, an alkenyl group, a phenyl group or a phenylene group, wherein R when represented by the general formula RCOOH has 1 to 30 carbon atoms. From the viewpoint of spot absorptivity and liquid absorption rate, more preferred are alkyl groups and alkenyl groups having 4 to 22 carbon atoms, and still more preferred are alkyl groups and alkenyl groups having 8 to 18 carbon atoms. These fatty acids may be linear or branched. The alkyl chain length and the alkenyl chain length may be distributed, but those having an alkyl chain length and alkenyl chain length within the above range should be present in an amount of 60 wt% or more based on all alkyl groups and alkenyl groups. .
The esterification degree (ester substitution degree) of sucrose fatty acid ester is such that the esterification degree is 2 if the esterification degree is 100% when all eight hydroxyl groups present in one molecule of sucrose are esterified. It is preferably a single compound or a mixture in the range of ˜60%, more preferably 5 to 45%, further preferably 15 to 35% from the viewpoint of the liquid absorption rate and spot absorbability.

The alkyl glucoside and sucrose fatty acid ester used as the surfactant preferably have an HLB of 4 to 20, more preferably 9 to 20 and even more preferably from the viewpoint of further improving the liquid absorption rate and spot absorbability. 12-18. The HLB used in the present invention is a W.W. C. This is a value calculated using the Griffin equation (J. soc. Cosm. Chemists 5 , S. 249, 1954).

The napkin 1 in this embodiment contains the specific surfactant mentioned above in the absorptive core 41 which comprises the absorber 4, as above-mentioned.
In the present embodiment, the surfactant is preferably present on the surface and / or inside of the superabsorbent polymer or adjacent to the superabsorbent polymer.

The case where the surfactant is present on the surface and / or inside of the superabsorbent polymer will be described. In this case, the surfactant is more preferably present so as to cover part or all of the surface of the superabsorbent polymer particles.
The presence position of the surfactant can be confirmed by analyzing the cross section of the superabsorbent polymer by time-of-flight secondary ion mass spectrometry (TOF-SIMS).

As a preferable method for causing the surfactant to be present on and inside the superabsorbent polymer, for example, a solution containing the surfactant (for example, a water-diluted solution) is sprayed on the superabsorbent polymer particles, followed by drying. The method of doing is mentioned.
As a preferable method for causing the surfactant to be present in the superabsorbent polymer, a method for washing the surface obtained by the above method and the surface of the higher aqueous polymer containing the surfactant in the interior can be mentioned.
As a preferred method for causing the surfactant to be present on the surface of the superabsorbent polymer, there is a method in which water is sprayed on the superabsorbent polymer particles, and then mixed with a solid surfactant and dried.
The method for causing the surfactant to exist on the surface and / or inside the superabsorbent polymer is not particularly limited.

It is preferable that the superabsorbent polymer having a surfactant on the surface and / or inside is disposed in the fiber assembly and constitutes the absorbent core 41 together with the fiber assembly.
As a mode in which the superabsorbent polymer is arranged in the fiber assembly, a mode in which the superabsorbent polymer is distributed three-dimensionally between the fibers of the fiber assembly, a mode in which it is sandwiched between two layers of the fiber assembly, etc. Is mentioned.
The fiber assembly constituting the absorbent core 41 may be made of a web that has not been made into a nonwoven fabric, or may be made of a nonwoven fabric. Moreover, the laminated body etc. of the web and the nonwoven fabric which are not made into the nonwoven fabric may be sufficient.

  The case where the surfactant is present adjacent to the superabsorbent polymer will be described. The state where the surfactant is adjacent to the superabsorbent polymer means a state where the surfactant alone or a material containing the surfactant is present in the vicinity of the higher aqueous polymer, and when the blood is absorbed, the surfactant is It means a state that exists in contact with blood almost simultaneously or slightly earlier than the superabsorbent polymer. In order for the surfactant to come into contact with blood slightly earlier than the superabsorbent polymer, the surfactant alone or the material containing the surfactant is in the absorbent core 41 on the skin contact surface side of the superabsorbent polymer. It is preferable to exist in More preferably, the surfactant alone or a material containing the surfactant is present in contact with the superabsorbent polymer.

  As a preferable method for making the surfactant exist adjacent to the superabsorbent polymer, for example, a solid surfactant and superabsorbent polymer particles are mixed, and then dispersed between two layers of fiber aggregates. And a method of spraying a superabsorbent polymer on a fiber assembly coated with a surfactant, but the treatment method is not particularly limited.

In the present embodiment, as the constituent fiber of the fiber assembly that constitutes the absorbent core 41 together with the superabsorbent polymer, various fibers conventionally used in the absorbent body can be used without any particular limitation. Cellulose-based hydrophilic fibers such as pulp or synthetic fibers can be used. Further, the fiber assembly may be composed of a mixture of a cellulose-based hydrophilic fiber such as pulp and a synthetic fiber, or a laminate of a fiber layer composed of a cellulose-based hydrophilic fiber and a fiber layer composed of a synthetic fiber. good.
Examples of the cellulosic hydrophilic fiber include pulp fiber, cotton, rayon, cupra, lyocell, hemp and the like. Examples of synthetic fibers include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, acrylic resins such as polyacrylic acid and polymethacrylic acid, vinyl resins such as polyvinyl chloride, and nylon. Examples thereof include fibers made from polyamide-based resins and the like. Among these various raw materials, a composite fiber (core-sheath type composite fiber or side-by-side type composite fiber) made of a combination of two kinds of resins can be used.

In the present invention, the amount of the surfactant used is 1.5 to 15 parts by weight with respect to 100 parts by weight of the superabsorbent polymer contained in the absorbent article (the absorbent core in the present embodiment). Preferably it is 2.0-13 weight part, More preferably, it is 3.0-10 weight part.
These ranges are preferable from the viewpoint of ensuring the effect of the present invention more reliably and reducing the waste of the surfactant in relation to the counter effect. The amount of surfactant used here is not the amount of diluted solution or the like, but the amount of surfactant remaining in the completed absorbent article. When a surfactant is present on the surface and / or inside of the superabsorbent polymer particles, the weight of the superabsorbent polymer in the case of 100 parts by weight of the superabsorbent polymer includes the weight of the surfactant. Absent.
When the superabsorbent polymer 41 is contained in the absorbent core 41 as in the napkin 1 of this embodiment, the content of the superabsorbent polymer 43 in the absorbent core 41 (surface and / or internal surface activity) In the case of the superabsorbent polymer in which the agent is present, the amount of the surfactant is also included in the weight of the superabsorbent polymer.) Is preferably 5 to 300% by weight based on 100 parts by weight of the fiber assembly, More preferably, it is 15-200 weight%, More preferably, it is 20-120 weight%.

  The napkin 1 of the present embodiment contains 1.5 to 15 parts by weight of the specific surfactant with respect to 100 parts by weight of the superabsorbent polymer, so that the absorption rate is fast, the spot absorbability is excellent, and the liquid returns. The amount is also small. The reason why such an effect is obtained has not yet been fully clarified, but the blood supplied on the top sheet 2 comes into contact with the surfactant at or near the surface of the superabsorbent polymer, and the blood This is considered to be because blood is easily drawn between the fibers of the absorbent core due to a change in the viscosity and surface tension, or the blood is modified to be easily absorbed by the superabsorbent polymer.

The material for forming each part of the napkin 1 of the present embodiment will be described. As the top sheet 2 and the leak-proof sheet 3, those conventionally used for this type of article can be used without any particular limitation. For example, as the surface sheet, nonwoven fabrics produced by various manufacturing methods, those obtained by forming holes in a resin film, laminates of these, and the like can be used. As the leak-proof sheet 3, a film of a thermoplastic resin with or without moisture permeability, a water-repellent nonwoven fabric, or a laminate thereof can be used.
Each of the covering sheets 44 and 45 and the second sheet 5 is a sheet made of a fiber material, for example, a nonwoven fabric made of hydrophilic fibers such as the above-described cellulose-based hydrophilic fibers or hydrophilic synthetic fibers, or a non-woven fabric web. Nonwoven fabrics, web laminates, paper, and the like can be used. The covering sheet 44 is preferably liquid permeable and has high wet strength.

  As the superabsorbent polymer 43, those conventionally used for this type of article can be used without particular limitation, but those which can absorb a liquid having a weight 20 times or more of its own weight and can be gelled are preferable. Polyacrylic acid and its alkali metal salts (partially or completely neutralized products), and polyacrylate graft polymers, such as copolymers of cross-linked carboxylmethylated cellulose, acrylic acid or alkali metal acrylates and other monomers, etc. Can be mentioned. Particularly preferred is an alkali metal polyacrylate (partially or completely neutralized product). These superabsorbent polymers can be used singly or in combination of two or more.

As mentioned above, although preferable embodiment of this invention was described, the absorbent article of this invention is not limited to the said embodiment, It can change suitably.
For example, the napkin 1 described above has the second sheet 5 and the covering sheets 44 and 45, but one or more of these can be omitted.

Further, the highly water-absorbing polymer 43 in the absorbent core 41 may be present in a biased manner on the surface sheet side, the leak-proof sheet side, or near the center in the thickness direction of the fiber assembly 42.
In addition to sanitary napkins, the absorbent article in the present invention may be a panty liner (cage sheet), an incontinence pad, a disposable diaper, or the like.

[Example 1]
A superabsorbent polymer (Aquaric CA-4 manufactured by Nippon Shokubai Co., Ltd.) is spread thinly on a horizontal base, and the surfactant (decylglucoside, manufactured by Kao Co., Ltd.) is used against the superabsorbent polymer in that state. A 1% water dilution of the trade name “Mydoll 10”) was sprayed.
Then, it was left to stand overnight in a blast constant temperature dryer having a temperature of 80 ° C. and a relative humidity of 3% to obtain a superabsorbent polymer having a surface and an internal surfactant. The presence position of the surfactant was confirmed by analyzing the cross section of the superabsorbent polymer by time-of-flight secondary ion mass spectrometry (TOF-SIMS).
And this superabsorbent polymer is totaled between two layers of defibrated pulp fiber sheet (NB416 manufactured by Wafer User) having a basis weight of 100 g / m ² adjusted to predetermined dimensions (width 75 mm, length 200 mm, thickness 1 mm). With respect to 100 parts by weight of defibrated pulp fiber, 60 parts by weight was dispersed to obtain an absorbent core. The absorbent core was obtained by covering the skin contact surface and the non-skin contact surface of the absorbent core with a wet pulp sheet (NB416 manufactured by Wafer User) having a basis weight of 20 g / m ² .
The surface sheet, the second sheet, and the back sheet (prevention prevention) used in the absorbent body thus obtained and a commercially available sanitary napkin (trade name “Laurier Super Slim Guard for Daytime”, manufactured by Kao Corporation). A sanitary napkin was prepared using a leakage sheet.
The obtained sanitary napkin contained 2.0 parts by weight of the surfactant with respect to 100 parts by weight of the superabsorbent polymer.
The surfactant content relative to 100 parts by weight of the superabsorbent polymer was calculated by measuring the weight change before and after the surfactant treatment.

[Examples 2 to 17]
In the same manner as in Example 1, the surfactants of the type shown in Table 1 were adhered so as to have the adhesion amount shown in Table 1. Otherwise, a sanitary napkin was prepared in the same manner as in Example 1.

Example 18
A surfactant (decyl glucoside, trade name “Mydol 10”) manufactured by Kao Corporation was freeze-dried to obtain a solid surfactant.
A superabsorbent polymer (Aqualic CA-4 manufactured by Nippon Shokubai Co., Ltd.) and the solid surfactant were mixed in an amount of 2.0 parts by weight with respect to 100 parts by weight of the superabsorbent polymer. A mixture of the superabsorbent polymer and the solid surfactant between two layers of a defibrated pulp fiber sheet (NB416 manufactured by Wafer User) having a basis weight of 100 g / m ² adjusted to a predetermined dimension (width 75 mm, length 200 mm, thickness 1 mm). Was dispersed so that the amount of the superabsorbent polymer was 60 parts by weight with respect to 100 parts by weight of the total defibrated pulp fiber to obtain an absorbent core. The absorbent core was obtained by covering the skin contact surface and the non-skin contact surface with a wet pulp sheet having a basis weight of 20 g / m ² (NB416 manufactured by Wafer User).
The surface sheet, the second sheet, and the back sheet (prevention prevention) used in the absorbent body thus obtained and a commercially available sanitary napkin (trade name “Laurier Super Slim Guard for Daytime”, manufactured by Kao Corporation). A sanitary napkin was prepared using a leakage sheet.

[Examples 19 to 20]
In the same manner as in Example 18, surfactants of the type shown in Table 1 were mixed so as to have the amounts shown in Table 1. Otherwise, a sanitary napkin was prepared in the same manner as in Example 18.

[Comparative Example 1]
In Example 1, the same operation was performed except not spraying Mydoll 10, and the sanitary napkin was obtained.
[Comparative Example 2]
In the same manner as in Example 1, the surfactants of the type shown in Table 1 were adhered so as to have the adhesion amount shown in Table 1. Otherwise, a sanitary napkin was prepared in the same manner as in Example 1.

[Evaluation]
[Evaluation of absorption rate, spot absorbency, and liquid return amount]
About each sanitary napkin of an Example and a comparative example, the rate of absorption, spot absorptivity, and liquid return amount were evaluated by the method shown below. In the evaluation, the absorption rate, the liquid spreading area and the liquid return amount were measured, and each measured value was classified into several categories according to the evaluation criteria described later. The evaluation results are shown in Table 1.
A sanitary napkin was placed horizontally, and an acrylic plate with a 1 cm diameter injection port and a weight were placed thereon so that 5.0 g / cm ² (490 Pa) pressure was applied to the napkin. Next, 6 g of defibrinated horse blood (manufactured by Nippon Biotest Co., Ltd.) was injected from the injection port in about 1 second, and the time for which all of the defibrinated horse blood was absorbed was measured to determine the absorption rate. The state was maintained for 3 minutes after injection.
Next, the acrylic plate and the weight were removed, the liquid spreading area was measured, and spot absorptivity was judged. The measurement of the liquid spreading area will be described later.
Then, 10 sheets of absorbent paper (commercially available tissue paper) with a basis weight of 30 g / m ^{2 and} a stack of 10 sheets (5 pairs of 2 sheets of tissue paper) are placed on the skin contact surface of the sanitary napkin. It was. Further, a weight was placed thereon so that the pressure was 6.6 × 10 ³ Pa, and pressure was applied for 2 minutes. The pressure is applied on the absorbent paper within 4 minutes after the liquid injection. After pressurization, 10 sheets of absorbent paper were taken out and the weight of the absorbent paper before and after pressurization was measured to determine the amount of blood absorbed by the absorbent paper. This value was defined as the amount of blood returned from the sanitary napkin.

[Measurement method of liquid spreading area]
Light source [Sunlight SL-230K2; manufactured by LPL Co., Ltd.], stand [Copy stand CS-5; manufactured by LPL Co., Ltd.], lens [24 mm / F2.8D Nikkor lens], CCD camera [(HV-37 Connection with lens by F-mount) and a video board [Spectra 3200; manufactured by Canopus Co., Ltd.]. In the measurement, it is necessary to obtain a correlation between the size displayed by the calibration operation and the pixel so that the area can be measured.
Next, an image of the liquid spread of the absorber core to be measured is captured. The captured image is binarized by the image analysis software NEW QUEBE (ver. 4.21) manufactured by NEXUS. An area is obtained from the binarized image and is defined as a liquid spreading area.

[Measurement method of liquid spreading area]
Light source [Sunlight SL-230K2; manufactured by LPL Co., Ltd.], stand [Copy stand CS-5; manufactured by LPL Co., Ltd.], lens [24 mm / F2.8D Nikkor lens], CCD camera [(HV-37 Connection with lens by F-mount) and a video board [Spectra 3200; manufactured by Canopus Co., Ltd.]. In the measurement, it is necessary to obtain a correlation between the size displayed by the calibration operation and the pixel so that the area can be measured.
Next, an image of the liquid spread of the absorber core to be measured is captured. The captured image is binarized by the image analysis software NEW QUEBE (ver. 4.21) manufactured by NEXUS. An area is obtained from the binarized image and is defined as a diffusion area.

〔Evaluation criteria〕
1. Absorption rate A: 0.2 g / second or more ○: 0.17 g / second or more and less than 0.2 g / second ○ Δ: 0.14 g / second or more and less than 0.17 g / second Δ: 0.1 g / second or more and 0.14 g Less than / sec. X: Less than 0.1 g / sec. Absorption rate

2. Spot absorptivity ◎: Liquid spreading area is less than 27 cm ² ○: Liquid spreading area is 27 cm ² or more and less than 30 cm ² ○ △: Liquid spreading area is 30 cm ² or more and less than 32 cm ² Δ: Liquid spreading area is 32 cm ² or more and less than 35 cm ² × : Liquid spreading area is 35cm ² or more

3. Liquid return amount ◎: Less than 0.9 g ○: 0.9 g or more and less than 1.0 g ○ △: 1.0 g or more and less than 1.1 g △: 1.1 g or more and less than 1.2 g ×: 1.2 g or more

  As can be seen from Table 1, the sanitary napkins of the examples all have good absorption speed, liquid return amount, and spot absorbability.

FIG. 1 is a cross-sectional view schematically showing a cross section in the thickness direction of a sanitary napkin according to an embodiment of the present invention.

Explanation of symbols

1 Sanitary napkin (absorbent article)
2 Surface sheet 3 Leak-proof sheet 4 Absorber 41 Absorbent core 42 Fiber assembly 43 Super absorbent polymer 44,45 Absorbent paper (coated sheet)
5 Second sheet (intermediate layer)
20 Skin contact surface 30 Non-skin contact surface

Claims (4)

  1.5 to 15 parts by weight of one or more surfactants selected from the group consisting of sugar alkyl ethers and sugar fatty acid esters with respect to 100 parts by weight of the superabsorbent polymer. Absorbent article to contain.   The absorbent article according to claim 1, wherein the surfactant is present on the surface and / or inside of the superabsorbent polymer.   The absorbent article according to claim 1, wherein the surfactant is present adjacent to the superabsorbent polymer.   The absorbent article according to claim 1, wherein the surfactant has an HLB of 9 to 20.

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