JPH06245958A - Water absorptive material - Google Patents

Abstract

PURPOSE:To enhance shape retentivity after liquid absorption by forming the water absorptive material to be used for paper diapers, menstrual articles, etc., of water absorptive resin particles, a thermally fusible resin and a fibrous base body and melting this thermally fusible resin, thereby fixing the water absorptive resin particles and the fibrous base body. CONSTITUTION:This water absorptive material consists of the water absorptive resin particles consisting of a hydrophilic crosslinked high polymer, etc., the thermally fusible resin having 50 to 180 deg.C m.p. and the fibrous base body and is formed by treating the thermally fusible resin at a temp. above its m.p. and fixing the water absorptive resin particles and the fibrous base body via the thermally fusible resin melted at this time. The ratio of the thermally fusible resin to 100 pts.wt. water absorptive resin particles is specified to 0.5 to 30 pts.wt. and the ratio of the water absorptive resin particles and the fibrous base body is specified to 50:70 to 90:100 by weight. The fibrous base body is formed of one kind selected from a group consisting of cellulose fibers, org. synthetic fibers and a mixture composed of the org. synthetic resins and cellulose fibers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water absorbent material having water absorbent resin particles fixed to a fiber base material. More specifically, the present invention relates to a water absorbing material having excellent absorption characteristics and shape retention after absorption.

[0002]

2. Description of the Related Art In recent years, powdery and granular hydrophilic cross-linked polymers called water absorbent resins have been used in absorbent articles such as disposable diapers and sanitary products in combination with fibrous base materials such as fluff pulp and / or synthetic fibers. There is. As a method for combining the water-absorbent resin particles (A) and the fibrous base material (C), a method of sandwiching (A) with (C), wrapping, blending, or the like is adopted. The point is not sufficient, and (A) is often separated from (C) due to impact or vibration. For the purpose of improving the sticking property of (A) to (C), (1) a small amount of water is sprayed onto the mixture of (A) and (C) to swell the surface of (A) and bond them. Drying, (2) spraying a small amount of water on (C), then (A) granulating or blending and drying, (3) spraying steam instead of water and then drying. ing.

[0003]

[Problems to be Solved by the Invention]
The methods (1), (2) and (3) have some fixing effects but are not sufficient. Especially, the larger the ratio of (A) to (C) is (for example, the ratio of the water absorbent resin / fiber is weight). If the ratio exceeds 30/70), the sticking property will decrease. Moreover, after the surface of the water-absorbent resin particles is brought into contact with water or water vapor to bring it into a swollen state, it is necessary to dry it.
However, there is a problem in that the surface state of the water is changed, resulting in a decrease in water absorption speed and a decrease in water absorption performance. As an attempt to improve the above problems, (4) after applying an adhesive to the surface of (C), (A)
(5) A method is proposed in which (A) is dispersed in a large amount of an organic solvent in which a binder is dissolved, and (C) is applied or impregnated, and then dried by heating to vaporize the organic solvent. ing. However, in the method (4), the fibrous base materials are adhered to each other due to the influence of the pressure-sensitive adhesive that does not contribute to the fixation of (A) to (C), and the water-absorbing material obtained is impaired in absorption performance or becomes sticky. As a result, problems such as difficulty in handling the water absorbing material occur. In the method (5), since the surface of (A) is covered with the binder, the absorption rate and absorption performance are deteriorated. Further, there is a problem that a large amount of energy is required to vaporize the organic solvent, which is uneconomical, and the safety of the remaining organic solvent is concerned.

[0004]

In view of the above problems, the present inventors have excellent absorption characteristics and shape retention after absorption, and excellent adhesion of water-absorbent resin particles to a fibrous base material. As a result of intensive studies on the water absorbing material, the present invention has been achieved.

That is, the present invention comprises water-absorbent resin particles (A), a heat-fusible resin (B) having a melting point of 50 to 180 ° C. and a fibrous base material (C), and has a temperature not lower than the melting point of (B). It is a water absorbing material in which (A) and (C) are fixed to each other through (B) by being treated with.

In the present invention, the water-absorbent resin particles (A) are usually hydrophilic cross-linked polymers capable of absorbing 30 to 1000 times as much water as their own weight. Group [refers to a carboxylic acid and / or a carboxylic acid group. The same description is used below. ], A water-absorbing resin having a hydrophilic group such as a sulfonic acid (salt) group, a phosphoric acid (salt) group, a tertiary amino group, a quaternary ammonium group, a hydroxyl group, or a polyethylene oxide group, The manufacturing method is not particularly limited. Examples of water-absorbent resins that can be preferably used in the present invention include starch-acrylic acid (salt) copolymers described in JP-B-53-46199 and JP-B-53-46200, JP-B-54- 30710 and JP Sho
JP-A-56-26909, cross-linked or self-cross-linked polyacrylate by the reverse phase suspension polymerization method, JP-A-55-55
-133413, cross-linked polyacrylic acid (salt) obtained by aqueous solution polymerization (adiabatic polymerization, thin film polymerization, spray polymerization, etc.), JP-A-52-14689 and JP-A-52-27455, etc. Saponified copolymer of vinyl ester and unsaturated carboxylic acid or derivative thereof described in JP-A-58-231
No. 2 and JP-A No. 61-36309, sulfonic acid (salt) group-containing water-absorbent resin, isobutylene-maleic anhydride copolymer crosslinked product, starch-acrylonitrile copolymer hydrolyzate, crosslinked Examples thereof include a carboxymethyl derivative, a crosslinked polyethylene oxide derivative, a crosslinked polyvinyl alcohol derivative, and a partial hydrolyzate of polyacrylamide. Further, a water absorbent resin obtained by surface-crosslinking the above water absorbent resin can also be used. You may use together 2 or more types of said water absorbent resin.

The absorption capacity of the water absorbent resin for physiological saline (0.9% sodium chloride aqueous solution) is usually 30 times or more of its own weight, preferably 35 to 100 times, more preferably 4 times.
It is 0 to 80 times.

The shape of (A) is not particularly limited as long as it is powdery and may be any shape such as granular, granular, granulated, flake shaped, lump shaped, pearl shaped and fine powdered. Good. 90% by weight or more is a powdery granule having a particle size distribution of 1 mm or less, and particularly preferably 90% by weight or more is 0.
It is a granular, granular, granulated, scaly or lumpy water absorbent resin having a particle size distribution of 1 to 0.9 mm.

In the present invention, the heat-fusible resin (B) is a polyolefin resin (polyethylene, polypropylene, low molecular weight polyethylene, low molecular weight polypropylene, etc.), a polyolefin derivative (maleic acid modified polyethylene, chlorinated polyethylene, maleic acid modified polypropylene). , Ethylene-acrylic acid copolymer, ethylene-maleic anhydride copolymer, propylene-acrylic acid copolymer, propylene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, maleated polybutadiene, ethylene- Vinyl acetate copolymer and maleated products thereof, polyester resin, polyamide resin,
Polycaprolactone resin, polystyrene resin and its derivatives (polystyrene, sulfonated polystyrene, styrene-maleic anhydride copolymer, etc.), thermoplastic polyurethane resin, high molecular weight polyethylene glycol, vinyl acetate resin, waxes (paraffin wax, beeswax, Beef tallow), long chain fatty acid ester resins and mixtures of two or more thereof. Among these, preferred are low molecular weight polyolefin resins (low molecular weight polyethylene, low molecular weight polypropylene, etc.), carboxylic acid modified polyolefin resins (maleic acid modified polyethylene, maleic acid modified polypropylene, etc.), olefin-acrylic acid copolymers (ethylene -Acrylic acid copolymer, propylene-acrylic acid copolymer, etc.), olefin-maleic anhydride copolymer (ethylene-maleic anhydride copolymer, propylene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer) Polymer). More preferred resins are maleic acid-modified polyethylene or maleic acid-modified polypropylene having a maleic acid content of 1 to 30% by weight; ethylene-acrylic acid or propylene-acrylic acid copolymer having an acrylic acid content of 1 to 30% by weight;
And ethylene with a maleic anhydride content of 1 to 30% by weight
It is maleic anhydride, propylene-maleic anhydride or isobutylene-maleic anhydride copolymer.

The melting point of (B) is 50 to 180 ° C, preferably 60 to 160 ° C. If the melting point is less than 50 ° C, blocking problems may occur during storage or use of the water absorbent material. On the other hand, when the melting point exceeds 180 ° C., it is necessary to process at a high temperature when fixing (A) and (C) through (B), which requires a large amount of heat energy and is not economical. However, the treatment at a high temperature is not preferable because the absorption performance may be deteriorated or a coloring phenomenon may occur.

The particle size of (B) is not particularly limited, but is usually 300 microns or less, preferably 1 to 250 microns, more preferably 10 to 200 microns. Grain size 3
If it exceeds 00 microns, a large amount of (C) is required to fix (A) and (C), which is not economical and the absorption rate of the water absorbing material is also reduced.

Further, the (B) is preferably a resin which does not dissolve or hydrolyze even when contacted with ordinary water for 24 hours. The reason for this is that when the water absorbent material of the present invention is applied to absorbent articles such as disposable diapers and sanitary products, it is possible to maintain a certain degree of adherence during the wearing period even after absorbing urine or menstrual blood. On the other hand, in the case of a resin in which (B) dissolves in water in a short time or becomes water-soluble by hydrolysis, there is no problem in fixing (A) and (C) in a dry state, After absorbing blood, the resin is dissolved to give a tingling sensation, and there is a problem that the gel moves or falls off after absorbing water.

Examples of the fibrous base material (C) in the present invention include cellulosic fibers, organic synthetic fibers, and a mixture of organic synthetic fibers and cellulosic fibers. Examples of the cellulosic fibers include natural fibers such as fluff pulp and cellulosic chemical fibers such as viscose rayon, acetate and cupra. Raw materials for this cellulosic natural fiber (softwood, hardwood, etc.),
The manufacturing method (chemical pulp, semi-chemical pulp, mechanical pulp, CTMP, etc.), bleaching method, etc. are not particularly limited. Examples of the organic synthetic fibers include polypropylene fibers, polyethylene fibers, polyamide fibers, polyacrylonitrile fibers, polyester fibers, polyvinyl alcohol fibers, polyurethane fibers, and heat-fusible composite fibers (for example, different melting points). Fibers obtained by compounding at least one of the above fibers into a sheath-core type, an eccentric type, a side-by-side type, a blended fiber of at least two types of the above fibers, and a fiber obtained by modifying the surface layer of the above fibers). . Among these fibrous substrates, preferred are cellulose-based natural fibers, polypropylene-based fibers, polyethylene-based fibers, polyester-based fibers, heat-fusible composite fibers and mixed fibers thereof, and more preferably, obtained In terms of excellent shape retention after absorbing water,
Fluff pulp, heat-fusible composite fibers and mixtures thereof.

The length and thickness of the fibrous base material are not particularly limited. Usually, the length is 1 to 200 mm and the thickness is 0.1 to 100.
A denier range can be preferably used.
The shape is not particularly limited as long as it is fibrous, and examples thereof include a thin cylinder shape, a split yarn shape, a staple shape, a filament shape, and a web shape.

In the present invention, the ratio of (A) to (B) is usually 0.5 to 30 parts by weight, preferably 1 to 20 parts by weight, and more preferably 100 parts by weight of (A). Is 3 to 15
Parts by weight. If the amount of (B) exceeds 30 parts by weight,
Although the adherence of (A) to (C) is improved, since (B) covers most of the surface of (A) (for example, 50% or more), (A) has the original absorption performance and absorption. The speed and the flexibility of the resulting water absorbent material are reduced. On the other hand, if the amount is less than 0.5 parts by weight, the adhesion of (A) to (C) decreases and
The shape retention of the obtained water absorbent material after absorption is poor.

The ratio of (A) to (C) is (A) :( C)
Is usually (20:80) to (95: 5) by weight, preferably (3
0:70) to (90:10), more preferably (35:65) to
(80:20). If the ratio of (A) is less than 20, the function of the absorbent material obtained will not be sufficiently exhibited, and if it exceeds 95, the shape retention of the water absorbent material after absorption will be poor.

The method for producing the water absorbing material of the present invention includes (1)
A method of preparing a mixture of (A) and (B) in advance, then mixing with (C) or spraying on (C), and treating at a temperature above the melting point of (B), (2) (A), ( B) and (C) are mixed in advance and then treated at a temperature above the melting point of (B), (3) (A), (B) and (C) at a temperature above the melting point of (B). A method of mixing and partially fixing (A) to (C) at the same time as mixing, (4) A mixture of (A) and (B) is prepared in advance, and the mixture is heated to a temperature not lower than the melting point of (B). Keeping (C) to granulate, coat or adhere, (5) Melt (5) (B) and then spray, coat or adhere to (C), and then spray or mix (A), (6) ) Premixed (A)
A method of spraying or mixing the mixture of (B) and (B) on (C) kept at a temperature not lower than the melting point of (B), (7) keeping (C) at a temperature not lower than the melting point of (B), ) And (B) are sprayed or mixed simultaneously or separately, (8) (B)
Examples of the method include spraying or mixing (A), which is kept at a temperature equal to or higher than the melting point of (B), to the mixture of (C) and (C).
Among these production methods, a preferable method is that a water-absorbing material in which (A) and (C) are fixed relatively uniformly via (B) is obtained, Is the way.
The more evenly (A) and (C) are fixed via (B),
The absorption characteristics and the shape retention after absorption are improved. still,
In the present invention, it is not always necessary that all of (A) is fixed to (C) via (B), and (A) is partially (for example, 50% by weight or more of (A)) (C). ) Is fixed. It becomes 60% by weight or more by selecting preferable conditions. If the adhesion ratio of (A) to (C) is less than 50%,
When applied to absorbent articles such as disposable diapers and sanitary products,
In the process of storing or transporting these products, (A) may be moved, ubiquitous, separated or dropped.

The device for mixing (A) with (B) and / or (C) may be a conventional mixing device, for example, a conical blender, a Nauter mixer, a V type mixer, a fluidized bed type mixer, a gas flow type. Examples include a mixing device, an air flow type mixing device equipped with a nozzle for blowing powdery or granular material, and a crushing device for fibrous materials equipped with a nozzle for blowing powdery or granular material. (B)
Examples of the apparatus for processing at a temperature equal to or higher than the melting point of are a hot air heater, a Nauta type heater, a fluidized bed type heater, an air flow type heater, a heating type calender roll, an infrared heating device, a high frequency heating device and the like.

The water-absorbing material of the present invention may be optionally subjected to a treatment generally applied to fibrous materials such as crushing, lamination, compression, cold calendering, heat calendering, needle punching, stretching and papermaking.

In the water absorbent of the present invention, a filler, an organic powder (eg pulp powder, cellulose derivative, natural polysaccharides, etc.), an inorganic powder (eg zeolite, silica, alumina, bentonite, activated carbon, etc.), glass Fibers, antioxidants, preservatives, bactericides, surfactants, colorants, fragrances and the like can be added as necessary, and these amounts are usually 10% by weight or less, preferably 5% by weight with respect to the weight of the water absorbing material. It is less than or equal to weight%.

[0021]

The present invention will be further described below with reference to Examples and Comparative Examples, but the present invention is not limited to these. The absorption amount, absorption rate, sticking rate, and shape retention after absorption were measured by the following methods. Unless otherwise specified below,
Parts are parts by weight, and% is% by weight.

Absorption: 1 g of water-absorbing material was put into a 250-mesh nylon net tea bag, and this was used as a large excess of 0.9
Soak in 1% saline for 1 hour to absorb, then lift 15
Drain for minutes and measure the weight gain. This value was defined as the absorption amount. Absorption rate: Put 1 g of water absorbent into a 250 mesh nylon net tea bag, soak it in a large excess of 0.9% saline for 2 minutes, then pull it up and drain for 15 minutes to measure the increased weight. This value was defined as the absorption rate. Sticking rate: Put 10 g of water-absorbent material into a 10-mesh sieve (opening 1.7 mm). Then, it is shaken for 5 minutes with a low tap type sieve shaker (manufactured by Iida Seisakusho Co., Ltd.), and the weight (W) of the shaken water-absorbent resin is measured. Here, assuming that the amount of the water-absorbent resin in the water-absorbent material before the test is W0, the sticking rate is obtained by the following formula. Sticking rate = [(W0−W) / W0] × 100 Shape retention: After absorbing 200 ml of physiological saline in 10 g of the water absorbing material, it is placed on a wire mesh with an opening of 4 mm. The wire mesh was vibrated to observe the degree of shape retention of the water-absorbent material after absorption and the degree of drop-off of the swollen water-absorbent resin, and evaluated according to the following criteria. ⊚: Good shape retention, almost no falling off of water-absorbent resin ○: Good shape retention, less drop-off of water-absorbing resin △: Water-absorbing resin with some shape retained X: The shape is not retained and the water-absorbent resin often falls off

Example 1 Cross-linked sodium acrylate-based water absorbent resin (SANYO KASEI KOGYO Co., Ltd.
"Sunwet IM-5000D" manufactured by Sanyo Chemical Co., Ltd .; 93 parts by weight and maleic acid-modified polyethylene having a particle size of 50 to 100 microns ("Yumex 2000P" manufactured by Sanyo Kasei Co., Ltd.);
7 parts with a melting point of 108 ° C.) were placed in a V-type mixer and mixed for 20 minutes. Next, this mixture and an eccentric type heat-fusible composite fiber (“ES fiber EA” manufactured by Chisso Corporation; low melting point component, melting point 110)
30 ° C.) and 70 parts of fluff pulp were mixed by an air flow type mixing device, and further treated with hot air at 130 ° C. for 2 minutes to obtain a water absorbing material (a) of the present invention. Table 1 shows the results of measuring the absorption amount, the absorption rate, the sticking rate, and the shape retention of the water absorbing material (a).

Examples 2 and 3 Water absorbing materials (b) and (c) were obtained in the same manner as in Example 1 except that the amounts of the water absorbent resin and the maleic acid modified polyethylene were changed as follows. It was The performance measurement results of these water absorbing materials are shown in Table 1. Water absorbent material (b): Water absorbent resin / maleic acid modified polyethylene = 97 parts / 3 parts Water absorbent material (c): Water absorbent resin / maleic acid modified polyethylene = 80 parts / 20 parts

Examples 4 to 6 In the same manner as in Example 1, except that the same amount of the following heat-fusible resin was used in place of the maleic acid-modified polyethylene, the water-absorbent materials (d) to (d) were used. f) was obtained. The performance measurement results of these water absorbing materials are shown in Table 1. Water absorbing material (d): low molecular weight polyethylene (Sanyo Kasei Co., Ltd.
"Sun Wax 161P"; melting point 111 ° C) Water absorbing material (e): Paraffin wax (melting point 83 ° C) Water absorbing material (f): Polyester resin ("Byron GM903P" manufactured by Toyobo Co., Ltd .; melting point 113) ℃)

Examples 7 to 11 In Example 1, instead of 30 parts of the heat-fusible composite fiber (“ES fiber EA” manufactured by Chisso Co .; low melting point component melting point 110 ° C.) and 70 parts of fluff pulp, Water absorbing materials (g) to (m) were obtained in the same manner as in Example 1 except that the kind and amount of the fibrous base material were used. Table 1 shows the performance measurement results of the water absorbing materials (j) to (p). Water absorbing material (g): heat-fusible composite fiber (“ES” manufactured by Chisso Corporation)
Fiber EA ") 60 parts and fluff pulp 40 parts Water absorbing material (h): heat-fusible composite fiber (" ESO "manufactured by Chisso Corporation)
Fiber EA ") 30 parts, polypropylene fiber 20 parts and fluff pulp 50 parts Water absorbing material (j): heat-fusible composite fiber (" ESO "manufactured by Chisso Corporation)
Fiber EA ") 45 parts Water absorbing material (k): 100 parts of fluff pulp Water absorbing material (m): Sheath core type heat-fusible composite fiber (Chisso Corporation)
"ES fiber EAC" manufactured by Low melting point component melting point 110 ° C) 30 parts and fluff pulp 70 parts

Example 12 In Example 1, the same amount of saponified vinyl acetate-methyl acrylate copolymer was used in place of the crosslinked sodium acrylate-based water absorbent resin (“Sumikagel S” manufactured by Sumitomo Chemical Co., Ltd.).
-50 "; pearl-like) was used to obtain a water absorbing material (n) in the same manner as in Example 1. Table 1 shows the results of performance measurement of this water absorbing material (n).

Example 13 Crosslinked sodium acrylate-based water-absorbent resin (Sanyo Kasei Co., Ltd.
93 parts of "Sunwet IM-5000D" manufactured by Co., Ltd. and 7 parts of maleic acid-modified polyethylene having a particle size of 50 to 100 microns ("UMEX 2000P" manufactured by Sanyo Kasei Co., Ltd.) are put in a V-type mixer. Mix for 20 minutes. This mixture
Heat-fusible composite fiber maintained at 130 ° C (“ESO” manufactured by Chisso Corporation)
45 parts of fibers EA ") were uniformly dispersed to obtain the water absorbing material (p) of the present invention. Table 1 shows the results of performance measurement of this water absorbing material (p).
Shown in.

Comparative Example 1 93 parts of cross-linked sodium acrylate water absorbent resin "Sunwet IM-5000D" and maleic acid modified polyethylene "Umex 2000P" having a particle size of 50 to 100 microns.
7 parts were placed in a V-type mixer and mixed for 20 minutes. Then
This mixture and the eccentric type heat-fusible composite fiber “ES fiber E
Comparative water absorbent material (a) by mixing 30 parts of "A" and 70 parts of fluff pulp at 25 ° C using an air flow type mixing device
Got Table 1 shows the results of measuring the amount of absorption, the absorption rate, the sticking rate, and the shape retention of this comparative water absorbent (a).

Comparative Example 2 Comparative Example 1 except that the same amount of saponified vinyl acetate-methyl acrylate copolymer "Sumikagel S-50" was used in place of the crosslinked sodium acrylate-based water absorbent resin in Comparative Example 1. A water absorbing material (b) was obtained in the same manner as in (1). Table 1 shows the results of performance measurement of this water absorbent material (b).

Comparative Example 3 A comparative water absorbing material (c) was obtained in the same manner as in Example 1 except that the mixing ratio of the water absorbent resin and the maleic acid modified polyethylene was changed to 60:40. Table 1 shows the results of performance measurement of this comparative water absorbent material (b).

Comparative Example 4 20 parts of maleic acid-modified polyethylene was dissolved in 180 parts of toluene, and 80 parts of finely powdered sodium polyacrylate-based water-absorbing resin was dispersed in a dispersion solution to obtain a heat-fusible composite fiber (Chiso ( Sprayed onto a fibrous base material consisting of a mixture of 30 parts of "ES fiber EA" manufactured by K.K.) and 70 parts of fluff pulp.
Then, by heating and drying at 130 ° C. to evaporate toluene, a comparative water absorbing material (d) was obtained. This comparative water absorbent material (d)
Table 1 shows the results of the performance measurement.

[0033]

[Table 1]

[0034]

The water absorbing material of the present invention has the following features and effects. It has excellent absorption performance and absorption rate. Excellent adhesion to fibrous base materials. It has a good shape-retaining property even after absorbing an aqueous liquid. Even when left in a high-humidity atmosphere, there is no risk of blocking unlike the conventional powdery water-absorbent resin. Good processability, such as easy blending with other fibers.

Since the water absorbing material of the present invention exhibits the above effects, it is useful for various hygienic materials such as paper diapers, sanitary products, puerperium mats, medical underpads and absorbent articles. In particular, it is useful for thin paper diapers and thin sanitary products having a large water absorbent resin / fiber (pulp and / or heat-adhesive fiber) ratio. In addition, freshness-maintaining material for fruits and vegetables, drip absorbent, moisture or humidity control sheet, anti-condensation material,
It is also useful for producing sheet-shaped or tape-shaped water-absorbing materials such as seedling-raising sheets for paddy rice, concrete curing sheets, water-stopping materials for communication cables and optical fiber cables.

Claims (8)

[Claims] 1. Water-absorbent resin particles (A) having a melting point of 50 to 180.
Consisting of a heat-fusible resin (B) and a fibrous base material (C) at a temperature of ℃, and by treating at a temperature above the melting point of (B), (A) and (C) are fixed via (B) Water absorbent material. 2. The amount of (B) relative to 100 parts by weight of (A)
The water absorbing material according to claim 1, which is 0.5 to 30 parts by weight. 3. The amount of (B) is 1 with respect to 100 parts by weight of (A).
The water-absorbing material according to claim 1, which is -20 parts by weight. 4. The weight ratio of (A) to (C) is 30:70.
The water absorbent material according to any one of claims 1 to 3, wherein the water absorbent material has a water content of 90:10. 5. The water absorbent material according to any one of claims 1 to 4, wherein a sticking ratio of (A) to (C) is 50% by weight or more. 6. The water absorbing material according to claim 1, wherein (C) is one selected from the group consisting of cellulosic fibers, organic synthetic fibers, and a mixture of organic synthetic fibers and cellulosic fibers. . 7. The heat-fusible composite fiber, wherein the organic synthetic fiber is at least one kind selected from a sheath core type, an eccentric type and a parallel type, and the melting point of the low melting point component is 50 to 180 ° C. Item 1
The water absorbent material according to any one of to 6. 8. An absorbent article using the water absorbing material according to claim 1.