JP2002224161A - Water absorbing article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water absorbing article wherein liquid reversing property is improved, and which is useful for hygienic materials. SOLUTION: This water absorbing article is equipped with a liquid-permeable surface sheet, a liquid-impermeable leakage preventive sheet, and an absorbing material having a water absorbing layer which contains a water absorbing resin between both sheets. In such a water absorbing article, the absorbing material comprises a highly water absorbing resin and a fiber base material. Also, the highly water absorbing resin layer is provided on the surface of the absorbing material which is confronted with the internal surface of the liquid- permeable surface sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a water-absorbent article using water-absorbent resin particles as a material for absorbing an aqueous liquid. More specifically, the present invention relates to a water-absorbent article useful for applications such as a disposable diaper, a sanitary napkin, and a pad for incontinent persons, in which a liquid return phenomenon caused by a load after water absorption is improved.

[0002]

2. Description of the Related Art Conventional absorbent articles are mainly used as an absorbent for absorbing an aqueous liquid by dispersing water-absorbing resin particles between fibrous base materials such as pulp, or two sheets of fibrous base material. A material in which a layer of water-absorbent resin particles is sandwiched between materials is used. For example, Japanese Patent Application Laid-Open No. Hei 8-246395 discloses that the superabsorbent resin is prevented from falling off by dispersing and bonding the particles of the superabsorbent resin between the fibers constituting the fiber web. Absorbent sheets have been proposed in which water and body fluids are reliably fixed with a highly water-absorbent resin and the amount of liquid returned is small. In addition, Japanese Patent Application Laid-Open No. 9-1560
No. 14, JP-A No. 14-27139 discloses a method of combining fibers having different fibrous properties as a fibrous base material in an absorbent sheet and dispersing the superabsorbent polymer particles between the fibers without impairing the absorbability of the superabsorbent polymer. There has been proposed an absorbent sheet having a good absorption performance in which is fixed. Furthermore,
Japanese Patent No. 2955223 discloses that, in an absorbent article of an absorbent article, a specific fiber is combined with an absorbent paper sandwiching the water-absorbent resin, and a gradient is given to the abundance ratio, so that the diffusivity and absorption / transmission of the liquid are increased. Suggestions have been made to improve gender. However, in these methods, the fibrous base material must be composed of fibers having different properties, and the water-absorbent resin particles must be uniformly dispersed and fixed between these fibers. The operation for the production is complicated and is not necessarily industrially advantageous.

In general, when a water-absorbent sheet absorbs water or body fluid, the water or body fluid is quickly absorbed by pulp or nonwoven fabric, which is a fibrous base material of the water-absorbent sheet, and the superabsorbent resin gradually absorbs water or body fluid. To be absorbed. However, fibrous base materials such as pulp and non-woven fabric which are excellent in absorption rate and local absorbability are inferior in liquid retention properties, and therefore are not absorbed by the highly absorbent resin due to the difference in absorption rate when the body fluid or moisture content is large. Moisture and body fluids will be present in the pulp and the nonwoven fabric, especially in disposable diapers and sanitary napkins where liquid reabsorption is repeated. When a load is applied to the absorbent sheet in such a state, a so-called liquid return phenomenon occurs in which water and body fluids return, but when such a phenomenon occurs in a sanitary material such as a disposable diaper or a sanitary napkin, they are attached. The contact surface of a person's skin becomes wet and not only unpleasant, but also causes rough skin. Therefore, development of an absorbent sheet suitable for sanitary materials that does not return and an absorbent article using the same are desired.

[0004]

The inventors of the present invention have made intensive studies on the phenomenon of liquid reversion in order to solve these problems. As a result, in an absorbent article, a water-absorbing layer made of a water-absorbing resin contains a fibrous base material. In the case of using a water-absorbing material with a specific layer structure with two layers interposed between layers, liquid reversal is suppressed compared to the case of using a water-absorbing material in which water-absorbing resin particles are uniformly dispersed in a fibrous base material. It has been found that the present invention has been achieved. An object of the present invention is to provide a water-absorbent article useful for a sanitary material with improved liquid reversion.

[0005]

The gist of the present invention is to provide a liquid-permeable topsheet, a liquid-impermeable leakproof sheet, and an absorbent material having a water-absorbing layer containing a water-absorbing resin between the two sheets. In the absorbent article, the absorbent comprises a superabsorbent resin and a fibrous base material, and a superabsorbent resin layer is provided on the surface of the absorbent facing the inner surface of the liquid-permeable topsheet. A water-absorbent article.

In a preferred embodiment of the present invention, the absorbent material comprises:
A fibrous base material layer is provided on both sides of a water-absorbent layer made of a highly water-absorbent resin, and a highly water-absorbent resin layer is provided on the surface of the fibrous base material layer facing the inner surface of the liquid-permeable topsheet. That the superabsorbent resin layer provided on the surface of the absorbent or fibrous base material layer is formed by spraying superabsorbent resin particles on the surface; Resin particles have an average particle size of 50 to 1000 μm, and 5 μm
１２０120 g / m ² , the weight ratio of the superabsorbent resin in the water-absorbing material or layer to the superabsorbent resin on the surface is 9: 1 to 7: 3, The absorbent material and the fibrous base material layer for dispersing the resin particles are made of at least hydrophilic fibers, especially cellulosic fibers, and the surface of the absorbent material or the fibrous base material layer facing the inner surface of the liquid-permeable topsheet. The absorbent provided with the superabsorbent resin layer thereon is sandwiched between absorbent papers, for example, cellulosic absorbent paper, and the weight ratio of the hydrophilic fiber to the superabsorbent resin is 3: 1. １ ： 1: 2.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The water-absorbent article of the present invention basically has a liquid-permeable topsheet and a liquid-impermeable leakproof sheet as described above, and a water-absorbent resin layer between the two sheets. , And in particular, an absorbent having two layers of a water-absorbing layer made of a water-absorbing resin via a sheet-like fibrous base material. 1 and 2
FIG. 1 is a schematic view showing a layer configuration of an embodiment of the water-absorbent article of the present invention. Hereinafter, the present invention will be described with reference to FIG. In the figure, 1 is a liquid-permeable surface sheet, 2 is a liquid-impermeable leakproof sheet, 3 and 4 are fibrous base materials, 5 is a water-absorbing layer composed of highly water-absorbing resin particles, and 6 is a high water-absorbing layer. A dispersion layer of conductive resin particles, and 7 and 8 are absorbent papers. The absorbent of the present invention is a laminated material composed of 3 to 6 layers. FIG. 2 shows another embodiment of the present invention.
Examples 5 to 5 include a layer in which a water-absorbing resin is uniformly dispersed in a fibrous base material.

The liquid-permeable topsheet is not particularly limited as long as it can transmit liquid.
It can be appropriately selected from those used in this kind of product and used. However, since the water-absorbing article is used as a sanitary material, it is preferable to have a feeling such as underwear that does not cause discomfort to a wearer. Specific examples of such a sheet include, for example, thermoplastic resin. Woven fabrics, nonwoven fabrics, porous films and the like can be mentioned. Among them, a porous film made of a polyolefin such as low-density polyethylene is preferable.

The liquid-impermeable leakproof sheet is not particularly limited as long as it does not allow liquid to pass therethrough, and can be appropriately selected from those usually used for such products. As the leak-proof sheet, a sheet that is particularly permeable to moisture and has a feel like underwear is preferable. The moisture-permeable and liquid-impermeable leakproof sheet is formed, for example, by melt-extrusion of a thermoplastic resin to which a filler of an inorganic compound or an organic compound is added, followed by uniaxially or biaxially stretching the film. Can be manufactured.

As the fibrous base material constituting the absorbent material of the present invention, for example, the three and four fibrous base material layers, a "formed" fibrous base material is preferable. The shaped fibrous base material is specifically a loosely formed pad of fibers, a carded or air-laid web, a tissue paper, a woven fabric such as cotton gauze, a meliath fabric or a non-woven fabric, It has a shape. Here, “formed” fibrous base material may require cutting, joining, shaping, etc., in order to incorporate the fibrous base material into an article, but it is necessary to further perform a web forming operation. Means nothing. The fibers of the fibrous base material are not particularly limited, and include hydrophilic fibers and hot-melt adhesive fibers. However, in order to quickly absorb the liquid, the main component is preferably hydrophilic fibers.

As the hydrophilic fiber, especially for so-called disposable diapers and sanitary napkins, a cellulose-based material giving bulkiness such as flap pulp is used in order to enhance adaptability to the body when used. It is preferable that the water-absorbent resin article according to the present invention also includes a layer giving bulkiness such as flap pulp. The basis weight of the hydrophilic fiber is 80 to 300 g / m ² , particularly 100 to 260 g / m ^2.
It is preferred that

Examples of the heat-meltable adhesive fibers include polyolefin fibers such as polyethylene, polypropylene and polyvinyl alcohol, polyester fibers, polyethylene-polypropylene composite fibers, polyethylene-polyester composite fibers, low-melting polyester-polyester composite fibers, and fiber surfaces. Is a hydrophilic polyvinyl alcohol-polypropylene composite fiber, and polyvinyl alcohol-
Examples thereof include polyester composite fibers.

In the molded fibrous base material of the present invention, the above fibers are obtained by mechanical entanglement or physical entanglement, and examples thereof include paper and nonwoven fabric, and paper is obtained by wet papermaking. Examples include paper and creped products. As the non-woven fabric, various non-woven fabrics such as carded non-woven fabric, spun-bonded non-woven fabric and spun-lace non-woven fabric can be used mainly composed of synthetic cellulose fiber such as rayon or cupra or natural cellulose fiber such as cotton.

The superabsorbent resin used in the present invention is preferably a gelling resin capable of absorbing and retaining a liquid 20 times or more its own weight. The superabsorbent resin is usually a water-absorbing polymer particle obtained by polymerizing a monomer containing a water-soluble polymerizable monomer. Water-absorbing polymer particles obtained by turbid polymerization are useful. A typical example of the polymer is
It is a polymer or copolymer of an aliphatic unsaturated carboxylic acid or a salt thereof, specifically, as a polymerizable monomer, an unsaturated monocarboxylic acid or a salt thereof such as acrylic acid or a salt thereof, methacrylic acid or a salt thereof, Alternatively, examples thereof include unsaturated dicarboxylic acids or salts thereof such as maleic acid or a salt thereof, itaconic acid or a salt thereof, and these may be used alone or in combination of two or more. Among them, preferred are acrylic acid or a salt thereof, and methacrylic acid or a salt thereof, and particularly preferred is acrylic acid or a salt thereof.

The polymerizable monomer can be copolymerized with other polymerizable monomers as long as the water-absorbing performance of the produced polymer is not deteriorated. Examples of the polymerizable monomer copolymerizable therewith include (meth) acrylamide and (Poly) ethylene glycol (meth) acrylate, 2-hydroxyethyl (meth) acrylate, or low water-soluble monomers such as alkyl acrylates such as methyl acrylate and ethyl acrylate. Furthermore,
A cross-linked copolymer in which a cross-linking agent is used in combination with a monomer such as acrylic acid or a salt thereof to form a cross-linked structure and improve water absorption performance can also be used. As the crosslinking agent, a divinyl compound copolymerizable with the polymerizable monomer, for example, N, N′-methylenebis (meth) acrylamide,
(Poly) ethylene glycol (meth) acrylates and the like, and water-soluble compounds having two or more functional groups capable of reacting with a carboxylic acid, for example, polyglycidyl ethers such as ethylene glycol diglycidyl ether and polyethylene glycol diglycidyl ether Is preferably used. Among them, N, N'-methylenebis (meth) acrylamide is particularly preferred.

The polymerization method is not particularly limited, and a conventionally known method, for example, an aqueous solution polymerization method or a reversed phase suspension polymerization method can be appropriately employed. Specifically, the reverse phase suspension polymerization method is a method in which an aqueous solution containing the above-mentioned water-soluble polymerizable monomer and a polymerization catalyst is suspended in a hydrophobic organic solvent by stirring or the like in the presence of a dispersant to carry out polymerization. In addition, a method of polymerizing an aqueous solution of a polymerizable monomer in an aqueous solution in a mold may also be used.
After the polymerization, it is necessary to make the particles into fine particles which can be applied to the present invention. Therefore, it is advantageously produced by a reversed-phase suspension polymerization method. As the polymerization method, any of a batch system and a continuous system can be adopted. In addition, while transporting the sheet of fibrous base material by a belt conveyor, the column of the reaction mixture in which the polymerization of the polymerizable monomer aqueous solution is in progress is dropped from above, and the generated droplets are formed on the fibrous base material sheet. The agglomerated granular material that was attached and integrated was completed polymerization after a predetermined time,
Then, it can be produced as a water-absorbing composite by a method of drying. In the water-absorbing composite thus obtained, the water-absorbing polymer becomes aggregated granular material, and a part of the aggregated granular material surrounds the base fiber or is in contact with the base fiber and fixed to the fibrous base material. And carried on a substrate (specifically, see JP-A-2000-198805). Examples of the shape of the water-absorbing polymer include, for example, granules, lumps, grapes, and powders, and granules are preferred, and the size is 50 to 10
It is 00 μm, preferably 100 to 800 μm.

In the absorbent material of the present invention, the water absorbing layer 5 made of a superabsorbent resin forms a sandwich structure sandwiched between the fibrous substrates 3 and 4. It can be formed by spraying superabsorbent resin particles on a porous substrate, superposing a fibrous substrate thereon, drying them if necessary, and then integrating them. When using a water-absorbing composite in which a water-absorbing polymer is immobilized on a fibrous base material, the water-absorbing polymer is manufactured by folding and integrating the surface with the supported surface of the water-absorbing polymer inside. You can also. The absorbent in which the superabsorbent resin is uniformly dispersed in the fibrous base material may be formed into a sheet by mixing crushed pulp or the like and the superabsorbent resin.

The dispersion layer 6 of the superabsorbent resin is formed on the surface of the fibrous base material facing the inner surface of the liquid-permeable topsheet among the fibrous base materials on both sides of the water-absorbing layer produced as described above, or It is formed by dispersing water-absorbing resin particles on the surface of the absorbent. The highly absorbent resin of the dispersion layer is provided to fulfill the function of mainly absorbing the returning body fluid,
The amount is smaller than that of the superabsorbent resin in the absorbent layer 5 or the absorbent. The amount of dispersion is usually such that the weight ratio of the superabsorbent resin in the water absorbing layer or absorbent to the superabsorbent resin on the surface is 9: 1 to 7:
3 and is 5 to 120 g / m ² .

The laminated material of the present invention has absorbent papers 7, 8 on its upper and lower sides.
And a liquid-permeable top sheet on the outside of the absorbent paper 7 and a liquid-impermeable leakproof sheet on the outside of the absorbent paper 8. Paper or nonwoven fabric obtained by wet papermaking of hydrophilic fibers, particularly cellulosic fibers, is used as the absorbent paper, but tissue paper is used for convenience. The absorbent paper 7 is preferably a thin layer because it is necessary to quickly guide the liquid that has passed through the liquid permeable sheet to the internal fibrous base material layer when absorbing body fluid. However, if it is too thin, the superabsorbent resin particles of the dispersion layer 6 may protrude.

The mechanism by which the water-absorbing article having the structure shown in FIG. 1 of the present invention absorbs body fluid is presumed as follows. That is, the bodily fluid passes through the liquid-permeable topsheet, and the passed fluid directly passes through the absorbent paper and the water-absorbent resin dispersion layer to reach the fibrous base material layer. The pulp or nonwoven fabric forming the fibrous base material layer absorbs body fluid in the voids of the fiber and holds it like a sponge, and the superabsorbent resin in contact with the fibrous base material absorbs and holds the liquid. The speed at which bodily fluids are absorbed is generally such that the speed of the fibrous base material is faster than the speed of the superabsorbent resin, and when the amount of the absorbed bodily fluids is large, some of the bodily fluids are It will be left behind in the fibrous substrate away from the contact surface. When a weight or the like is applied to the water-absorbing article in such a state and pressurized, a so-called liquid return occurs in which the remaining body fluid returns. In the water-absorbent article of the present invention, the amount of liquid returned is significantly reduced by absorbing the returning body fluid left behind on the fibrous base material by the highly water-absorbent resin dispersion layer provided on the fibrous base material surface. It becomes possible.

[0021]

Next, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to the following examples unless it exceeds the gist of the present invention.

Example A water-absorbent sheet of the present invention having the structure shown in FIG. 1 was prepared. The liquid-permeable top sheet (1) is made of a nonwoven fabric of polypropylene fiber (basis weight 50 g / m ² ), and the liquid-impermeable leak-proof sheet (2) is a polyethylene sheet (basis weight 20 g).
/ M ² ). For the fibrous base materials (3) and (4), fluff pulp (basis weight 128 g / m ² ) was used, and for the absorbent papers (7) and (8), commercially available tissue paper (basis weight 18 g / m ² ).
m ² ) was used. The superabsorbent resin is polymer particles produced by reverse phase suspension polymerization of sodium acrylate, and has an average particle size of 450 μm (produced by the method described in Example 1 of Japanese Patent Application No. 11-184908). Particles were used.). Using fluff pulp (basis weight 128 g / m ² ), a water-absorbing layer (5) was formed so that the water-absorbing resin became 160 g / m ² ,
The dispersion layer (6) was formed so as to be 40 g / m ² . The water-absorbing layer sprays a predetermined amount of resin particles on a fluff pulp sheet that has been wetted by spraying water in advance, and superimposes another fluff pulp sheet on the fluff pulp sheet, followed by pressure bonding and integration.
Next, a predetermined amount of resin particles were uniformly dispersed on one surface of the fluff pulp sheet, and then dried with a dryer.
The laminated material created in this way is sandwiched between tissue papers, and a liquid-permeable top sheet is placed on the side having the resin particle layer on the fluff pulp sheet, and a liquid-impermeable leakproof sheet is placed on the opposite side, and the whole is crimped. The two sheets were heat-sealed to form a water-absorbent sheet.

Comparative Example 1 An absorbent sheet was prepared in the same manner as in Example 1, except that a water-absorbing layer was formed using the entire amount of the resin particles, and no dispersion layer was provided. FIG. 3 schematically shows the structure of this sheet.

[0024] The fluff pulp sheet used in Comparative Example 2 Example 1 was crushed in the disc turbine blade, the amount the resin particles is 200 g / m ² and fluff pulp are uniformly mixed and dispersed round amount 256 g / m ² Afterwards, it was made into an integrated pulp mix sheet. This sheet was sandwiched between tissue papers, and a liquid-permeable topsheet and a liquid-impermeable leakproof sheet were further placed thereon to integrate the whole body by pressure bonding. Both sheets were heat-sealed to form a water-absorbent sheet. FIG. 4 schematically shows the structure of this sheet.

Example 2 The fluff pulp sheet used in Example 1 was crushed by a disk turbine blade, and the resin particles contained 160 g / m ^2.
Was uniformly mixed and dispersed to form an integrated pulp mix sheet, on which resin particles were uniformly dispersed so as to be 40 g / m ² to form a dispersion layer. After the whole was pressure-bonded and integrated, a water-absorbent sheet was prepared in the same manner as in Example 1. FIG. 2 schematically shows the structure of this sheet.

The evaluation of the water-absorbent sheets prepared in the above Examples and Comparative Examples was performed by the following method. <Absorption speed (diffusibility)> A cylinder having an inner diameter of 40 mm and having an open top is attached to the center, and seven through-holes having a diameter of 5 mm are provided at substantially equal intervals in a portion surrounded by the cylinder. Acrylic plate (100 × 100
× 10 mm, total weight 150 g) was transferred to a water-absorbent sheet (18
0 × 180 mm), and further, a diameter of 100 mm
mm disk with a hole with a diameter of 45 mm in the center (500 mm
g) is placed through a cylinder. Artificial urine colored in a cylinder 5
Add 0 ml. For coloring, 2 ml of a 1% aqueous solution of brilliant fast blue GC (manufactured by Nippon Kayaku Co., Ltd.) was used for 1 L of artificial urine.
Was carried out. The time from the moment when the artificial urine was put to the moment when even one of the seven holes was completely absorbed was measured with a stopwatch, and the water absorption rate was determined. Table 1 shows the results. The unit of the absorption speed is seconds.

<Measurement of liquid return> After measuring the water absorption rate, the water absorption sheet is left for 10 minutes without applying a load. Then, a 10 cm square filter paper (ADVANT
EC No. 424; manufactured by Toyo Roshi Kaisha, Ltd.), and a 4.5 kg load is applied thereon for 5 minutes. After 5 minutes, the load was removed and the weight of the filter paper was measured. The amount of water absorption, which was the difference from the previously measured weight of the filter paper, was defined as the liquid return amount (g). FIG. 5 shows the results of the measurement performed three times for each sheet.

<Diffusion> Using the water-absorbent sheet subjected to the liquid return measurement, the absorption rate measurement and the liquid return measurement were repeated in two steps.
Times, ie, three times in total. After the third step, the heat-sealed portion of the water-absorbent sheet is cut open to measure the spread (long direction) of artificial urine in the upper tissue portion, pulp portion, and lower tissue portion of the water-absorbent sheet. The average value was defined as the diffusivity (mm). Table 1 shows the results.

In the above evaluation and measurement, artificial urine having the following composition by weight was used. Urea 1.94% Sodium chloride 0.80% Calcium chloride 0.06% Magnesium sulfate 0.11% Pure water 97.09%

[0030]

[Table 1]

[0093]

In the case of disposable diapers and sanitary napkins using the water-absorbent article having the structure of the present invention, the reversion of water and body fluid is significantly reduced even under a load such as when weight is applied. An exhilarating wearing feeling can be obtained without giving any discomfort to the person wearing these.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a layer configuration of a water-absorbent article of the present invention.

FIG. 2 is a schematic diagram illustrating a layer configuration of a water absorbent article of Example 2.

FIG. 3 is a schematic diagram illustrating a layer configuration of a water absorbent article of Comparative Example 1.

FIG. 4 is a schematic diagram showing a layer configuration of a water absorbent article of Comparative Example 2.

FIG. 5 is a chart showing measurement results of a liquid return amount of a water-absorbent sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid-permeable surface sheet, 2 Liquid-impermeable leakproof sheet 3,4 Fibrous base material 5 Highly water-absorbent resin water-absorbing layer 6 Highly water-absorbent resin dispersion layer 7,8 Water-absorbing paper

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) B32B 5/00 A61F 13/18 303 307D 307F F term (reference) 3B029 BA15 BA18 BD19 4C003 AA07 AA13 AA25 AA27 4C098 AA09 CC03 DD24 DD25 DD26 4F100 AJ04D AJ04E AK01C AK04B AK07 AK07A AK24C AT00A AT00B BA04 BA05 BA07 BA10A BA10B DE01C DG01A DG01D DG01E DG02D DG02E DG10E DG15 DG15 J05B05D05 J05B05D

Claims (10)

[Claims] 1. An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable leak-proof sheet and an absorbent having a water-absorbing layer containing a water-absorbing resin between the two sheets.
A water-absorbent article comprising a superabsorbent resin and a fibrous base material, wherein a superabsorbent resin layer is provided on the surface of an absorbent facing the inner surface of a liquid-permeable topsheet. 2. An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable leak-proof sheet and an absorbent having a water-absorbing layer containing a water-absorbing resin between the two sheets, wherein the absorbent is a high-absorbent material. A fibrous base material layer is provided on both sides of a water-absorbent layer made of a water-absorbent resin, and a highly water-absorbent resin layer is provided on the surface of the fibrous base material layer facing the inner surface of the liquid-permeable topsheet. A water-absorbent article. 3. The superabsorbent resin layer provided on the surface of the absorbent or fibrous base material layer is formed by spraying superabsorbent resin particles on the surface. The water-absorbent article according to claim 1. 4. The superabsorbent resin particles have an average particle diameter of 50 to 50.
The water-absorbent article according to any one of claims 1 to 3, wherein the water-absorbent article has a thickness of 1000 µm and is sprayed on the surface at 5 to 120 g / m ² . 5. The method according to claim 1, wherein the weight ratio of the superabsorbent resin in the water absorbing material or the absorbing layer to the superabsorbent resin on the surface is 9: 1 to 7: 3. The water-absorbent article according to any one of the preceding claims. 6. The water-absorbing material according to claim 1, wherein the absorbent material or the fibrous base material layer on which the highly water-absorbing resin particles are dispersed is composed of at least hydrophilic fibers. Products. 7. The water-absorbent article according to claim 6, wherein the hydrophilic fiber is a cellulosic fiber. 8. An absorbent material having a highly water-absorbent resin layer provided on the surface of an absorbent material or a fibrous base material layer facing the inner surface of a liquid-permeable top sheet is sandwiched between absorbent papers. The water-absorbent article according to any one of claims 1 to 7, wherein: 9. The water-absorbent article according to claim 8, wherein said absorbent paper is made of cellulose fiber. 10. The water-absorbent article according to claim 1, wherein the weight ratio of the hydrophilic fiber to the superabsorbent resin is 3: 1 to 1: 2.