CN1163100A - absorbent article - Google Patents

Abstract

An absorbent article having a liquid-permeable topsheet, a liquid-impermeable backsheet, and a liquid-storage absorbent body embedded therebetween, wherein the absorbent body satisfies the following condition (1), and the super absorbent body contained in the absorbent body The absorbent polymer satisfies the following conditions (2) and (3): (1) the absorbent body mainly includes a fibrous base material and a superabsorbent polymer, based on the total weight of the absorbent body, the proportion of the superabsorbent polymer (2) According to the centrifugal dehydration method, the physiological saline absorbency of the superabsorbent polymer is not less than 25g/g; (3) The liquid transit time of the superabsorbent polymer is not more than 20 seconds.

Description

absorbent article

The present invention relates to absorbent articles, more particularly, absorbent articles such as disposable diapers and sanitary napkins, which absorbent articles comprise a liquid-permeable topsheet, a liquid-impermeable backsheet, and an embedded topsheet and backsheet. It is a liquid-storage absorbent body between materials, and the absorbent article still has high absorption performance even when the absorbent body is very thin, and has a good fit feeling and excellent leak-proof performance.

Absorbent articles, such as disposable diapers, sanitary napkins and incontinence pads, mainly include an absorbent body arranged at the central part thereof, which absorbs and retains bodily fluids such as urine or blood excreted by the human body, absorbs The sexual article also includes a soft, liquid-permeable topsheet disposed on the skin-contacting side, and a liquid-impermeable backsheet disposed on the other side of the absorbent body.

Conventional absorbent bodies are made from a hydrophilic fiber base such as wood pulp and superabsorbent polymers. Body fluid flows through the top sheet made of nonwoven fabric or the like, and is then absorbed by the absorbent body. Absorbed body fluids are temporarily lodged in the fibrous matrix, such as wood pulp, and then migrate and be stored in the superabsorbent polymer. In conventional absorbent articles, the superabsorbent polymer is used in a proportion of about 10-30% based on the total weight of the absorbent body.

The thickness of such absorbent articles is generally reduced by reducing the amount of fibrous substrate and increasing the amount of superabsorbent polymer. In this case, as the proportion of superabsorbent polymer in the absorbent body increases, and the body fluid swells and softens the superabsorbent polymer particles, these particles will come into contact with each other, or the polymer particles will rearrange and approach each other. The spaces between the swollen particles become smaller. As a result, the space, which should function as a channel for body fluids, becomes blocked, and a layer of body fluid forms over the blockage, a phenomenon known as gel occlusion. Once the gel blocking phenomenon occurs, the absorbent article can no longer absorb body fluid even if the absorbed body fluid amount is not saturated.

On the other hand, it is also known to integrally form the topsheet and the absorbent body to increase the liquid permeability from the topsheet to the absorbent body. In this case, the top sheet and the absorbent body separate, hindering absorbency. If a large amount of hot melt adhesive is used to prevent the separation of the cover sheet and the absorbent body, the hot melt adhesive can cause clogging and also hinder absorbency.

Japanese Patent Application Laid-Open No. 49964/92 proposes incorporating combined fibers having different melting points into an absorbent body to integrally form the absorbent body and the topsheet by thermal bonding. However, according to its disclosure, the absorbent body becomes slightly hydrophobic due to the high blending ratio of the combined fiber. As a result, not only is the absorbency reduced, but some superabsorbent polymers used together also result in reduced absorbency due to clogging. Furthermore, since the core material of the combined fibers is a resin having a high modulus of elasticity, the absorber becomes thick, making it difficult to reduce the overall thickness.

Accordingly, it is an object of the present invention to provide a thin absorbent article whose absorbent core has a high proportion of superabsorbent polymer, but which still has excellent reabsorbability without hindering absorbency, such as sticking block.

As a result of extensive research by the present inventors, it has been found that by using a certain proportion of superabsorbent polymers in the absorbent body, and that the superabsorbent polymers have specific absorption properties and specific liquid passage times, the absorbency meeting the above-mentioned purpose can be obtained. Items (first found).

The present inventors have also found that the above objects can be achieved by an absorbent article having an absorbent body composed of a first absorbent layer and a second absorbent layer, the first absorbent layer comprising a specific superabsorbent polymer , the second absorbent layer also comprises a specific superabsorbent polymer, and the first and second absorbent layers are arranged in such a way that the respective superabsorbent polymers cannot mix with each other (second finding).

The present invention has been accomplished based on the first discovery, and achieves its object by providing an absorbent article having a liquid-permeable topsheet, a liquid-impermeable backsheet, and a liquid reservoir embedded therebetween. An absorbent body, wherein the absorbent body satisfies the following condition (1), and the superabsorbent polymer contained in the absorbent body satisfies the following conditions (2) and (3) (hereinafter referred to as "the first aspect of the present invention") ):

(1) The absorbent body mainly includes a fibrous base material and a superabsorbent polymer, and the proportion of the superabsorbent polymer is not less than 45% by weight based on the total weight of the absorbent body.

(2) The superabsorbent polymer has a physiological saline absorbency of not less than 25 g/g according to the centrifugal dehydration method.

(3) The liquid transit time of the superabsorbent polymer is not more than 20 seconds, which is determined by the following method: 0.5 g of the superabsorbent polymer is placed in a glass with a cross-sectional area of 4.91 cm filled with physiological saline. ² (inside diameter 25mmφ) cylinder so that the superabsorbent polymer is swollen with physiological saline until saturated, and then after the swollen superabsorbent polymer sinks, measure 50ml of physiological saline through the superabsorbent polymer The required time (the term "liquid transit time" used hereafter refers to the measured value obtained under these conditions).

The present invention is also based on the second discovery and achieves its object by providing an absorbent article having a liquid-permeable topsheet, a liquid-impermeable backsheet and a liquid-storage substrate interposed therebetween. An absorbent body, wherein the absorbent body has a first absorbent layer comprising a superabsorbent polymer (A) satisfying the above condition (3), and a second absorbent layer comprising a superabsorbent polymer satisfying the following condition ( 4) superabsorbent polymer (B); said superabsorbent polymer (A) and said superabsorbent polymer (B) are present in a manner not substantially mixed together; and said first absorbent layer The second absorbent layer is disposed on the side close to the top sheet, and the second absorbent layer is disposed on the side close to the back sheet (hereinafter sometimes referred to as the second aspect of the present invention).

(4) The physiological saline absorption rate of the superabsorbent polymer (B) is not less than 5g/30sec/0.3g, which is measured by the demand wettability (DW) method.

The absorbent article according to the present invention has a high proportion of superabsorbent polymer in the absorbent body, yet has excellent reabsorbability without hindering absorbency, such as gel blocking, and has reduced thickness.

The absorbent article according to the present invention has excellent rapid liquid absorbency even when a large amount of liquid is discharged at one time.

The absorbent article according to the present invention feels very comfortable when worn because its absorbent body is thin.

The absorbent article according to the present invention can reduce liquid leakage due to twisting deformation of the absorbent body, and since the absorbent body of the absorbent article according to the present invention can stably maintain its shape, the absorbent article has a good performance when worn. Exterior. Brief description of the drawings:

Fig. 1 is a perspective view of a disposable diaper as a first embodiment of the absorbent article of the first aspect of the present invention.

Fig. 2 is a flat plan view of the disposable diaper shown in Fig. 1, with a part cut away.

Fig. 3 is a schematic cross-section of a main part of a disposable diaper as a second embodiment of the absorbent article of the first aspect of the present invention along its width direction.

Fig. 4 is a schematic cross-section of a main part of a disposable diaper as a third embodiment (corresponding to Fig. 3 ) of the absorbent article of the first aspect of the present invention along its width direction.

Fig. 5 is a schematic cross-section of a main part of a disposable diaper as a fourth embodiment (corresponding to Fig. 4 ) of the absorbent article of the first aspect of the present invention along its width direction.

Fig. 6 is an enlarged cross-sectional view schematically showing the structure of an absorbent body used in the second aspect of the present invention.

Fig. 7 is an enlarged cross-sectional view schematically showing another structure of the absorbent body used in the second aspect of the present invention (corresponding to Fig. 6).

Fig. 8 is an enlarged cross-sectional view (corresponding to Fig. 6) schematically showing still another structure of the absorbent body used in the second aspect of the present invention.

Fig. 9 is an enlarged cross-sectional view (corresponding to Fig. 6 ) schematically showing still another structure of the absorbent body used in the second aspect of the present invention.

Figure 10 shows an apparatus for measuring the liquid transit time of superabsorbent polymers.

Fig. 11 shows a device for measuring the absorption rate of physiological saline according to the demand wettability (DW) method.

Preferred embodiments of the absorbent article according to the first aspect of the present invention, such as a disposable diaper, will be described below with reference to the accompanying drawings. Fig. 1 is a perspective view of a disposable diaper as a first embodiment of the absorbent article of the first aspect of the present invention. Fig. 2 is a flat plan view of the disposable diaper shown in Fig. 1, with a part cut away.

The disposable diaper of the embodiment shown in FIGS. 1 and 2 comprises a liquid-permeable topsheet 2, a liquid-impermeable backsheet 3 and a liquid-storage absorbent body 4 interposed between the topsheet 2 and the backsheet 3. As shown in FIG. It has a front waist portion 5 and a rear waist portion 5' which respectively correspond to the front and rear parts of the wearer's body when the diaper is worn.

A pair of fastening belts 10 and 10' are provided on the rear waist portion 5' of the disposable diaper 1, and when the diaper is worn, the front waist portion 5 and the rear waist portion 5' can be fastened together by them. On the surface of the backsheet 3 of the front waist portion 5 is provided a so-called fastening tape 11 to which the fastening tapes 10 and 10' are glued to each other.

The absorbent body 4 has a portion corresponding to the crotch portion of the diaper, which is hourglass-shaped. Waist elastics 6 and leg elastics 8 are provided along the absorbent body 4, that is to say at the front and rear waist portions 5 and 5' and the two leg opening portions. These elastic bodies are fixed between the surface material 2 and the back material 3 in a stretched state, so that they will retract in a free state to form waist gathers 7 and 7' at the waist opening and leg opening. And the leg gathers 9 and 9', so as shown in FIG. 1, it can fit well to the wearer's body.

In the disposable diaper 1, the topsheet 2 is a liquid-permeable sheet through which bodily excrement can pass into the absorbent body 4, and is preferably made of a material having a feel of underwear. Such liquid-permeable sheets preferably include woven fabrics, nonwoven fabrics and porous films. The surface sheet 2 preferably used has a water-repellent periphery, so that leakage of urine or the like from the periphery can be prevented. The treatment for making the sheet water-repellent can be carried out by coating the peripheral portion of the surface material 2 with a hydrophobic compound such as silicone oil and paraffin oil, or by coating the surface material 2 with a hydrophilic compound such as alkyl phosphate the entire surface, and then rinse the surrounding area with warm water.

The backsheet 3 is a moisture-permeable and liquid-impermeable sheet material, that is to say impermeable to liquid and permeable to water vapor, preferably made of a material with a sense of underwear become. Such a liquid-impermeable sheet can be obtained by stretching a filler-containing thermoplastic resin. Specifically, the liquid-impermeable sheet is preferably made of a microporous sheet having moisture permeability and a composite sheet including the microporous sheet and a nonwoven fabric. Specific details of the microporous sheet preferably used in the present invention will be described later.

The elastic body 6 forming the waist gathers 7 and 7' and the elastic body 8 forming the leg gathers 9 and 9' are preferably rubber threads, rubber braided belts, elastic films or polyurethane foam films.

The absorbent body 4 should satisfy the above condition (1), that is, it mainly includes fibrous base material and superabsorbent polymer, and the proportion of superabsorbent polymer is not less than 45% by weight based on the total weight of the absorbent body.

Fibrous base materials include cellulosic fibers, modified cellulosic fibers, synthetic fibers and mixtures of two or more of the foregoing.

Cellulosic fibers include natural fibers such as wood pulp and cotton, and cellulosic chemical fibers such as viscose rayon and acetate fibers.

Synthetic fibers include polyethylene fibers, polypropylene fibers, polyester fibers, polyamide fibers, polyacrylonitrile fibers, polyvinyl alcohol fibers, core/sheath type composite fibers containing at least two of these synthetic fibers, and fibers composed of at least two of these A blend of synthetic fibers.

The fibrous base material is preferably various hydrophilic cellulose fibers. When using a non-hydrophilic fiber base, the material can be surface-treated with a surfactant to make it hydrophilic.

In the absorbent body 4, the superabsorbent polymer is used in a proportion of 45% by weight or more based on the total weight of the absorbent body 4. As mentioned above, conventional disposable diapers only allow a superabsorbent polymer content of about 10-30% by weight based on the total weight of the absorbent body, if problems such as gel blocking are considered. In the present invention, even when the content of the superabsorbent polymer is not less than 45% by weight, gel blocking does not occur, which makes the absorbent article of the present invention have excellent reabsorbability and thickness can also be reduced. The superabsorbent polymer is preferably used in an amount of 45-90% by weight, especially 50-80% by weight, based on the total weight of the absorbent body.

The fibrous base material is preferably used in an amount of 10-55% by weight, especially 20-50% by weight, based on the total weight of the absorbent body, for the following reasons. If the amount of the fibrous base material is less than 10% by weight, the absorbent body 4 may be torn or distorted during use due to lack of mutual entanglement between the fibers of the fibrous base material. If it exceeds 55% by weight, thin absorbent articles cannot be obtained.

The absorbent body 4 may consist of a fibrous base material and a superabsorbent polymer, or mainly comprise a fibrous base material and a superabsorbent polymer, and additionally contain other optional components, as long as the object and effect of the present invention are not affected. Other optional components that can be used in the absorbent body include organic powders, such as pulp powder and natural polysaccharides; inorganic powders, such as zeolites, activated carbon and fine silica particles; pigments; bactericides; fragrances; Special fiber thermoplastic resin.

The superabsorbent polymer used here should satisfy the above conditions (2) and (3). That is, (2) the physiological saline absorption of the superabsorbent polymer is not less than 25 g/g according to the centrifugal dehydration method; and (3) the liquid transit time of the superabsorbent polymer is not more than 20 seconds, This is determined according to the following method: 0.5 g of the superabsorbent polymer is placed in a cylinder with a cross-sectional area of 4.91 cm ² (inner diameter: 25 mmφ) filled with physiological saline, so that the superabsorbent polymer is absorbed by the physiological saline. The absorbent polymer was swollen until saturated, and after the swollen superabsorbent polymer sank, the time required for 50 ml of physiological saline to pass through the superabsorbent polymer was measured.

The "physiological saline absorption action" (hereinafter sometimes referred to as water absorption action) according to the condition (2) is a measure of the water absorption performance of the superabsorbent polymer. If the water absorption is lower than 25 g/g, even if the amount of the superabsorbent polymer is 45% by weight or more based on the total weight of the absorbent body 4, the resulting absorbent article will not have sufficient absorbency. The higher the water absorption, the better, but considering the actual situation, the preferred range of water absorption is 25-65g/g, especially 35-65g/g. The method of measuring water absorption will be described in detail in Examples later.

The "liquid transit time" according to condition (3) is a measure of gel blocking of the superabsorbent polymer. If the liquid passage is longer than 20 seconds, the superabsorbent polymer is used in an amount of 45% by weight or more based on the total weight of the absorbent body, which causes gel blocking and hinders its absorbing performance. The shorter the liquid passage time, the better, but considering the actual situation, the preferred range is 2-20 seconds, especially 2-25 seconds. The method of measuring the liquid passage time will be specifically described in Examples.

As long as the conditions (2) and (3) are satisfied, the kind of superabsorbent polymer used is not particularly limited. Examples of suitable superabsorbent polymers include sodium polyacrylate, acrylic acid-vinyl alcohol copolymers, cross-linked sodium polyacrylates, starch-acrylic acid graft polymers, isobutylene-maleic anhydride copolymers and their saponification products, polyacrylic acid potassium, and cesium polyacrylate. The superabsorbent polymer satisfying the conditions (2) and (3) can be obtained by forming a crosslink density gradient on the surface of the superabsorbent polymer particles, or by making the superabsorbent polymer particles non-spherical and non-spherical. regular shape. More specifically, please refer to the method disclosed in column 7, line 28-column 9, line 6 of Japanese Patent Application Publication No. 184956/95, which is hereby incorporated by reference.

If the conditions (2) and (3) are satisfied, gel blocking of the superabsorbent polymer can be effectively prevented, and thus can be used in large quantities in absorbent bodies, whereby the thickness of the absorbent body can be reduced.

The above-mentioned fibrous base material and superabsorbent polymer may be present in the absorbent body 4 in admixture, or the superabsorbent polymer may be present in the fibrous base material as a single layer. The fibrous base may be in the form of a laminate in which a fine fibrous base is placed, or in the form of a sheet such as paper or non-woven fabric.

In order to ensure a practical absorbent performance when used as an absorbent article, superabsorbent polymers are preferably used in a basis weight of 10-1000 g/m ² , especially 20-500 g/m ² .

Since the amount of superabsorbent polymer used in the absorbent body 4 is larger than that of the fibrous base material, the thickness of the absorbent body 4 is thinner compared with conventional absorbent bodies. Thus, it naturally follows that the disposable diaper 1 is also thinner than conventional ones. Specifically, the thickness of the disposable diaper 1 is preferably 1.0-4.0 mm, particularly preferably 1.0-3.0 mm, under a load of 2.5 g/cm ² .

A disposable diaper as a second embodiment of the absorbent article according to the first aspect of the present invention will be described below with reference to FIG. 3 . Fig. 3 is a schematic cross-section of a main part of a disposable diaper as a second embodiment of the absorbent article of the first aspect of the present invention along its width direction.

Only the difference between the second embodiment and the above-mentioned first embodiment will be described. Although not indicated, the above description of the first embodiment also applies to the second embodiment in the same way. In FIG. 3, the same components as those in FIGS. 1 and 2 are indicated by the same numerals.

The absorbent body 4 used in the second embodiment shown in Figure 3 comprises two or more layers (only two layers in Figure 3); referred to as "fibrous base layer") and at least one other layer is layer 16 comprising the above-mentioned superabsorbent polymer or a mixture of superabsorbent polymer and fibrous base (hereinafter referred to as "polymer-containing layer"). These layers are placed on top of each other alternately to form the absorbent body 4 . The absorbent body 4 having such a structure is preferable for the following reason. Even if the superabsorbent polymer swells after absorbing body fluids, so that the entanglement between the fibers of the fibrous base material in the polymer layer 16 is reduced, the entanglement of the fibrous base material in the fibrous base material layer 15 is not reduced. . Therefore, although the absorbent body is thin, it is difficult to be torn or deformed.

As shown in FIG. 3 , the polymer-containing layer 16 is provided on the side close to the surface sheet 2 , and the fibrous base material layer 15 is provided on the side close to the backsheet 3 . By pressing, the polymer-containing layer 16 and the fibrous base material layer 15 are brought into close contact with each other.

The absorbent body 4 has one or more fibrous substrate layers 15 (in Figure 3 only one layer). The fibrous base material layer 15 in the absorbent body 4 preferably has a total saturation absorbency of physiological saline not lower than 0.1 g/cm ² . If the saturated absorbency of the total physiological saline is lower than 0.1 g/cm ² , the fibrous base material layer does not have sufficient ability to temporarily retain body fluids, resulting in leakage. The greater the saturation absorption of normal saline, the better. However, from practical considerations, the saturated absorbance of physiological saline is preferably 0.1-10 g/cm ² . The method of measuring the saturated absorbance of physiological saline will be described in the following examples.

The fibrous base layer 15 in the absorbent body 4 may be in the form of a laminate in which a fine fibrous base is placed, or in the form of a sheet such as paper or nonwoven fabric.

It is particularly preferred that at least one fibrous substrate layer 15 is made of a sheet or non-woven fabric containing hydrophilic fibers such as paper (eg absorbent paper). Using the fibrous base material layer 5 in the form of a sheet is preferable to using a laminated form in which a fine fibrous base material is placed; because the former prevents the absorbent body from being torn or deformed during use.

If the fibrous base material layer 15 is a sheet, it is preferable that the basis weight of the sheet is 5 to 200 g/cm ² , especially 10 g/cm 2 , from the viewpoint of maintaining the shape of the absorbent body 4 and reducing the thickness of the absorbent body 4 in actual use. -100g/cm ² .

The polymer-containing layer 16 in the absorbent body 4 is a polymer-containing layer. In order to improve the bonding between the layers 15 and 16, it is preferred that the polymer-containing layer 16 is formed by dispersing on the fibrous base material layer 15 A small amount of water or an aqueous solution containing a binder component, such as latex, wets the layer 15, and then disperses a predetermined amount of superabsorbent polymer thereon.

On the other hand, if the polymer-containing layer 16 is a layer comprising a mixture of superabsorbent polymer and fibrous base material, the layer is preferably composed of 50-95 parts by weight, especially 55-75 parts by weight, of superabsorbent polymer and 5- 45 parts by weight, especially 25-45 parts by weight of fiber base material. In this case, it is preferred that the superabsorbent polymer is uniformly dispersed on the polymer-containing layer 16 .

A disposable diaper as a third embodiment of the absorbent article according to the first aspect of the present invention will be described below with reference to FIG. 4 . Fig. 4 is a schematic cross-section of a main part of a disposable diaper as a third embodiment (corresponding to Fig. 3 ) of the absorbent article of the first aspect of the present invention along its width direction.

Only the points of this third embodiment that differ from the first and second embodiments described above will be described. Although not indicated, the above description of the first and second embodiments also applies to the third embodiment in the same way. In Fig. 4, the same parts as in Figs. 1-3 are shown with the same numerals.

The absorbent body 4 used in the third embodiment shown in FIG. 4 includes three layers, wherein one layer is a layer comprising the above-mentioned superabsorbent polymer or a mixture of the above-mentioned superabsorbent polymer and a fibrous base material (that is, the above-mentioned A polymer-containing layer 16) sandwiched between two layers comprising the same or different fiber substrates, ie the above-mentioned fiber substrate layers 15 and 15. The absorbent body 4 having such a structure is preferable for the following reason. Similar to the second embodiment, although the absorbent body is thin, it is hardly torn or deformed. In addition, since the superabsorbent polymer in the polymer-containing layer 16 is sandwiched between the fibrous base material layers 15 and 15, it hardly falls out of the absorbent body 4.

Depending on the type or use of the absorbent article used, the fibrous substrate layers 15 and 15 sandwiching the polymer-containing layer 16 may be the same or different fibrous substrates.

A fourth embodiment as the absorbent article according to the first aspect of the present invention will be described below with reference to FIG. 5 . Fig. 5 is a schematic cross-section of a main part of a disposable diaper as a fourth embodiment (corresponding to Fig. 3 ) of the absorbent article of the first aspect of the present invention along its width direction.

Only the difference between the fourth embodiment and the above-mentioned first to third embodiments will be described. Although not indicated, the above description of the first to third embodiments also applies to the fourth embodiment in the same way. In Fig. 5, the same parts as in Figs. 1-4 are shown with the same numerals.

In a fourth embodiment, the topsheet comprises thermoplastic resin fibers; the absorbent body comprises 45-90% by weight of superabsorbent polymer and 0.5-20% by weight of thermoplastic resin particles or fibers, based on the total weight of the absorbent body; and the topsheet is Thermally bonded to thermoplastic resin particles or fibers of the absorbent body.

As shown in FIG. 5 , the absorbent body 4 contains superabsorbent polymer particles 63 and thermoplastic resin particles or fibers 65 , and also contains pulp fibers as a fiber base 64 . Superabsorbent polymer particles 63 , thermoplastic resin particles or fibers 65 , and fibrous base material 64 are uniformly mixed together and dispersed in the absorbent body 4 .

The absorbent body 4 preferably contains 45 to 90% by weight of the superabsorbent polymer based on the total weight of the absorbent body 4 for the following reasons. If the proportion of the superabsorbent polymer is less than 45% by weight, the thickness of the absorbent body must be increased in order to have a sufficient absorbing capacity, but thus the thickness of the diaper is also increased. If it exceeds 90% by weight, the shape retention of the absorbent body may be poor, or the superabsorbent polymer particles may drop when wet.

Preferably, 0.5-20% by weight of the total weight of the absorbent body 4 contains particles or fibers of thermoplastic resin. As will be described later, thermoplastic resin particles or fibers are used to be integrated with the top sheet 2 and back sheet 3 (if necessary) by thermal bonding, thereby increasing the liquid absorption rate and shape retention of the absorbent body 4 . Therefore, if the proportion of the particles or fibers of the thermoplastic resin is less than 0.5% by weight, thermal bonding with the topsheet 2 or backsheet 3 may not be secure. If it exceeds 20% by weight, the absorbent body as a whole becomes hydrophobic, or the thermoplastic resin particles or fibers become thin films, impairing absorbency. The proportion of thermoplastic resin particles or fibers is preferably 5-15 wt%.

Thermoplastic resins can be in granular or fibrous form, or a mixture of particles and fibers.

Preferably, the superabsorbent polymer and thermoplastic resin particles or fibers together constitute at least 45.5% by weight or more, especially 55% by weight or more of the total weight of the absorbent body 4 . Other materials that may constitute the absorbent body 4 together with superabsorbent polymer and thermoplastic resin particles or fibers include the aforementioned fibrous base materials. The proportion of other materials, if present, is preferably at most 54.5% by weight, based on the total weight of the absorbent body 4 .

In the absorbent body 4, the weight ratio of superabsorbent polymer to thermoplastic resin particles or fibers is preferably 99:1 to 50:50, still preferably 90:10 to 75:25. If the weight ratio is within the above range, shape retention of the entire absorbent body 4 and thermal bonding with the topsheet 2 can be ensured, but absorbency is not hindered. If it is outside the above range, the prevention of absorption inhibition or the degree of thermal bonding is insufficient.

From the viewpoints of a) thickness reduction, b) softness of the entire absorbent article, c) compact packaging, and d) weight reduction, the unit weight of the absorbent body 4 as a whole is preferably 100-1000 g/m ² , especially 200-1000 g/m 2 . 700g/m ² , and its total thickness is preferably 0.5-10mm, especially 0.5-5mm under a load of 0.5g/cm ² .

The thermoplastic resin particles or fibers used are selected from those capable of being integrated with the surface sheet 2 (and the back sheet 3, if necessary) by thermal bonding. Such thermoplastic resins include polyolefin resins such as polyethylene and polypropylene; polyester resins such as polyethylene terephthalate; and polyamide resins such as nylon. The thermoplastic resin may be the same as in the topsheet or the backsheet.

When a particulate thermoplastic resin is used, the average particle diameter of the particles is 10-2000 µm, especially 50-1000 µm, from the viewpoints of uniform dispersibility, workability and prevention of absorption hindrance.

On the other hand, if the thermoplastic resin used is fibrous, the fibers may be any of long fibers such as continuous filaments and short fibers such as staple fibers. The fiber diameter is preferably 0.2-10 denier, especially 1-6 denier, from the standpoint of uniform mixing property, uniform dispersibility, and ease of heat treatment. Particularly preferred fibers are bicomponent composite fibers composed of a high-melting point component and a low-melting point component, such as core/sheath type composite fibers and side-by-side type composite fibers.

As shown in FIG. 5, the thermoplastic resin particles or fibers 65 in the absorbent body 4 and the topsheet 2 containing thermoplastic resin are bonded together by thermal bonding. Specifically, at least a part of the thermoplastic resin particles or fibers 65 is thermally bonded to the top sheet 2, so that the absorber 4 and the top sheet 2 are bonded as a whole. The absorber 4 and the topsheet 2 are integrated by thermal bonding, but the permeability and liquid absorbency are not affected. As a result, the shape retention of the absorbent body 4 is improved; leakage due to twisting or deformation is reduced; and the diaper can also have a good appearance when worn. As described above, it is not necessary to thermally bond all of the thermoplastic resin particles or fibers 65 to the surface sheet 2 . What is required is that at least the thermoplastic resin particles or fibers 65 adjacent to the top sheet 2 are thermally bonded to the top sheet 2, whereby the top sheet 2 and the absorbent body 4 are integrally formed.

It is also preferable that the thermoplastic resin particles or fibers 65 are thermally bonded to each other inside the absorber 4 to form a three-dimensional network structure. This three-dimensional network structure can not only effectively prevent gel blocking when the superabsorbent polymer particles 63 swell, but also further improve the shape retention of the absorbent body 4 .

The term "integrated" as used herein means that the topsheet 2 and the absorbent body 4 have shape retention to such an extent that when the diaper is wetted with a liquid such as water, they still maintain a given shape without being separated from each other. open.

As shown in Fig. 5, it is also preferable that the thermoplastic resin particles or fibers 65 in the absorbent body 4 and the back sheet 3 containing the thermoplastic resin are integrally formed by thermal bonding. In this case, the shape retention of the absorbent body 4 can be further improved; leakage due to twisting or deformation can be further reduced; and the appearance of the diaper when worn is better.

The disposable diaper 1 according to this embodiment is preferably manufactured by laminating a topsheet 2, a homogeneous mixture of superabsorbent polymer particles 63, thermoplastic resin particles or fibers 65 and a fibrous base material 64, and then superimposing a bottom layer thereon. The material 3 is thermally bonded together with hot air at a predetermined temperature or by thermal embossing, whereby the surface material 2, thermoplastic resin particles or fibers 65, and the base material 3 are integrated.

In the present invention, a microporous sheet obtained by at least uniaxially stretching a sheet comprising polyolefin and filler is particularly preferable for use as the back sheet 3 .

The preferably used microporous sheet includes a sheet obtained by stretching in at least one direction a molded sheet comprising a mixture of a crystalline polyolefin resin and a compound (filler), wherein the compound is mixed with a crystalline polyolefin in a molten state. Olefins are mutually soluble, but at or below the crystallization temperature of the crystalline polyolefin resin, phase separation occurs between the compound and the crystalline polyolefin (hereinafter referred to as microporous sheet A).

Without limitation, crystalline polyolefins include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, polypropylene, ethylene-propylene copolymer Polymers, propylene-butene copolymers, ionomer resins, and their polymer blends. Preferred among them are polypropylene resins, polymer blends of polypropylene resins and ethylene-propylene copolymer resins, and polymer blends of polypropylene resins and polyethylene resins. Part of the crystalline polyolefin resin can be replaced by polyester resin, such as polyethylene terephthalate and polybutylene terephthalate, and the ratio is appropriate not to damage the inherent properties of crystalline polyolefin.

The crystalline polyolefin resin preferably has a melt index of 15 g/10 min or less, particularly 0.2 to 12 g/10 min, for the following reasons. A crystalline polyolefin resin having a melt index of 15 g/10 min or less can provide the melt tension required during sheet formation and can be molded into a sheet at high speed in a stable manner. If the melt index is lower than 0.2 g/10 min, high energy is required for extrusion into a sheet, which lowers productivity. The term "melt index" used here is the value obtained according to ASTM D-1238, namely: for polypropylene and polyethylene copolymers, the load is 2.16kgf, the temperature is 230 ° C; for polyethylene, the load is 2.16kgf, the temperature is 190°C.

Compound (filler)-another component in the mixture is miscible with crystalline polyolefin in molten state, but phase separation occurs with crystalline polyolefin at or below the crystallization temperature of crystalline polyolefin resin compound of. The compounds include, without limitation, various hydrocarbons, such as liquid paraffin, α-olefin oligomers, mineral oil, synthetic lubricating oil, mineral spirits, and paraffin; and various combinations of fatty carboxylic acids and (poly)alcohols Esters such as dioctyl phthalate, diethyl phthalate, trimethylolpropane laurate, distearyl adipate, and tetraoctyl pyromellitate ester. Mineral oils, synthetic lubricating oils, paraffins, and esters of fatty carboxylic acids and (poly)alcohols are preferred among them. Part of the mixture can be replaced by a water-repellent agent, such as silicone oil, and the proportion should be as small as not to damage the inherent performance of the mixture.

The mixture is preferably composed of 50-90 parts by weight of the crystalline polyolefin resin and 10-50 parts by weight of the compound. If the amount of the compound is less than 10 parts by weight, the mixture cannot impart sufficient moisture permeability to the microporous sheet A. If it exceeds 50 parts by weight, the mechanical strength of the obtained microporous sheet A is insufficient, and the compound bleeds out from the microporous sheet A during long-term storage. The mixture is preferably composed of 60-80 parts by weight, especially 60-75 parts by weight of the crystalline polyolefin resin and 20-40 parts by weight, especially 25-40 parts by weight of the compound.

In addition to the crystalline polyolefin resin and compound, the mixture may contain other additives, such as nucleating agents, if desired. Nucleating agents are preferably used to increase the crystallinity of the crystalline polyolefin. The nucleating agent is preferably used in an amount of 0.01 to 3 parts by weight, preferably 0.05 to 1 part by weight, per 100 parts by weight of the mixture, for the following reasons. If the amount of the nucleating agent is less than 0.01 parts by weight, sufficient nucleation cannot be produced. If it exceeds 3 parts by weight, the resulting microporous sheet A does not have sufficient moisture permeability.

Although not limited, useful nucleating agents include 1.3-, 2.4-dibenzylidene sorbitol, 1.3-, 2.4-bis(p-methylbenzylidene)sorbitol, 1.3-, 2.4-bis(p-ethylbenzylidene) Benzyl)sorbitol, sodium bis(4-tert-butylphenyl)phosphate, adipic acid, benzoic acid, sodium benzoate, talc, titanium dioxide and kaolin.

Other additives that may be incorporated into the mixture include inorganic fillers (such as calcium carbonate), stabilizers (such as antioxidants), antistatic agents, organic pigments, and dyes. These additives are used in an amount of 0.01-10 parts by weight, preferably 0.1-5 parts by weight, per 100 parts by weight of the mixture.

The mixture is molded into a sheet by blown film extrusion or T-die extrusion, and the resulting sheet is stretched at least uniaxially to obtain a sheet having continuous microporosity and moisture permeability. Stretching is preferably performed at a stretch ratio of 1.2 to 5 in terms of area in at least one direction. If the draw ratio is lower than 1.2, sufficient microvoids cannot be formed to provide sufficient moisture permeability. If the draw ratio exceeds 5, stable production is difficult because the sheet is torn when stretched or the resulting sheet is easily torn. In order to ensure satisfactory texture and sufficient moisture permeability, a stretch ratio of 1.2-3 is still preferred.

Stretching may be performed with a uniaxial roll stretcher for uniaxial stretching, or with a tenter or mandrel stretcher for simultaneous or continuous biaxial stretching. The sheet may be heated while stretching.

Microporous sheets preferably used in the present invention also include those obtained by stretching in at least one direction a molded sheet comprising a mixture of a crystalline polyolefin resin and a thermoplastic resin or filler incompatible with the crystalline polyolefin resin The sheet (hereinafter referred to as microporous sheet B).

Fillers that can be used here include those commonly used in rubber or plastics, such as inorganic fillers such as calcium carbonate, gypsum, calcium sulfate, calcium phosphate, magnesium carbonate, magnesium sulfate, hydrated silicic acid, anhydrous silicic acid, sodium alkali Ash, sodium chloride, sodium sulfate, barium sulfate, talc, clay, various kinds of lime, pozzolan, shirasu, titanium dioxide, iron oxide and carbon black; various metal powders; other inorganic substances; and those consisting mainly of inorganic substances organometallic salts. Also included in the filler are thermosetting resins such as phenolic resins, epoxy resins, and sodium polyacrylates; crosslinked (by radiation-induced) thermoplastic resins such as polyethylene, polypropylene, and polyacrylates; and crystalline polyolefins with melting points higher than resin at the molding temperature. Desirably, these fillers are used in the form of particles having an average particle size of not more than 50 μm, especially between about 0.05-30 μm, especially about 0.1-5 μm.

The filler is preferably used in an amount of 50-400 parts by weight, especially 60-300 parts by weight, per 100 parts by weight of crystalline polyolefin. If the amount of the filler is less than 50 parts by weight, the number of continuous pores formed in the resulting microporous sheet B decreases, resulting in a decrease in moisture permeability. If it exceeds 400 parts by weight, sheet formation and subsequent stretching are difficult.

Fillers are preferably used in combination with softeners. Plasticizers and lubricants commonly used in rubber and plastics can be used as softeners. Examples of usable emollients include monoesters from fatty acids and fatty alcohols, mono- or polyesters from aromatic carboxylic acids and fatty alcohols, polyesters from fatty polycarboxylic acids and polyols, Polyesters of acids and/or polycarboxylic acids and monoalcohols and/or polyols, esters or polyesters with residual alcoholic hydroxyl groups and/or residual carboxyl groups, fatty amides, aromatic amides, metal soaps of fatty acids, aromatic carboxylic acids Metallic soaps, dibutylene oligomers, butene oligomers, isobutylene oligomers, isoprene oligomers, petroleum resins, benzofuran resins, ketone resins, chlorinated paraffins, silicone oils, liquid paraffins, and Polyethylene wax.

Although the amount of the softener used may vary depending on the affinity between the softener and the crystalline polyolefin resin, the affinity between the softener and the filler, and the desired softening properties of the microporous sheet B, the amount is preferably 100 The crystalline polyolefin resin is 0-20 parts by weight, especially 0.1-10 parts by weight.

On the other hand, thermoplastic resins incompatible with crystalline polyolefin resins include styrene polymers such as general-purpose polystyrene, high-impact polystyrene, acrylonitrile-styrene copolymer, butadiene-benzene Ethylene copolymers, and acrylonitrile-butadiene-styrene copolymers; polymethylmethacrylates; polyesters, such as polyethylene terephthalate and polybutylene terephthalate; polyamides , such as nylon 6 and nylon 66; polycarbonate; polyacrylonitrile; modified or derived polymers of these thermoplastic resins; and mixtures of two or more thereof. The dispersion of these thermoplastic resins can be easily controlled by adding one or more of the following polymers to the thermoplastic resin: thermoplastic elastomers, such as styrene polymers, polyolefins, polyurethanes, polyesters, polyamides, poly( 1,2-butadiene), poly(trans-1,4-isoprene) and the like. It is desirable to use a thermoplastic resin in a dispersed state with an average particle diameter of not more than 50 µm, especially about 0.05-30 µm, especially about 0.1-5 µm.

The thermoplastic resin is preferably used in an amount of 10-100 parts by weight, especially 20-100 parts by weight, per 100 parts by weight of the crystalline polyolefin resin.

If a thermoplastic resin is used, it is preferably used in combination with the same softening agent as used when fillers are used. The amount of softener is the same as that used for the filler.

For other details of microporous sheet B, the foregoing description of microporous sheet A is also applicable.

A preferred embodiment of the second aspect of the invention will now be described with reference to the accompanying drawings 6-9. 6 to 9 schematically show enlarged cross-sectional views of the structure of the absorbent body of a preferred embodiment of the absorbent article used in the second aspect of the present invention, respectively.

Only those embodiments which differ from the first to fourth embodiments of the first aspect of the invention are described. Although not indicated, the above description of the first to fourth embodiments also applies to the same of the second aspect of the present invention. In Figs. 6-9, the same parts as in Figs. 1-5 are shown with the same numerals.

Disposable diapers according to these embodiments are structurally the same as those shown in FIG. 1 except that the absorbent body has a first absorbent layer and a second absorbent layer, and the first absorbent layer contains The superabsorbent polymer (A), and the second absorbent layer comprises a superabsorbent polymer (B) satisfying the following condition (4); the superabsorbent polymer (A) and the superabsorbent polymer (B) are not substantially mixed and the first absorbent layer is arranged on the side close to the surface material, while the second absorbent layer is arranged on the side close to the bottom material.

(4) The physiological saline absorption rate of the superabsorbent polymer (B) is not less than 5g/30sec/0.3g, which value is measured according to the demand wettability (DW) method.

As used herein, "substantially not mixed with each other" means that the presence of superabsorbent polymer (A) and superabsorbent polymer (B) does not impair their respective properties mutually.

The substantially non-mixing of superabsorbent polymer (A) and superabsorbent polymer (B) with each other is preferably achieved by (i) a mixture of superabsorbent polymer (A) or (B) with a fiber base At least one of the first absorbent layer and the second absorbent layer is formed, or (ii) the first absorbent layer and the second absorbent layer are separately stacked by a fibrous base material layer comprising a fibrous base material.

It is also possible that the first absorbent layer composed of superabsorbent polymer (A) and the second absorbent layer composed of superabsorbent polymer (B) are stacked on top of each other. In this case, although it is difficult to completely separate the superabsorbent polymer (A) and superabsorbent polymer (B) from each other, as long as the properties of the polymers are not impaired each other, it is considered that mixing to this extent is basically unnecessary. mixed with each other. For example, if the first absorbent layer comprises less than 30% by weight of the superabsorbent polymer (B) in the vicinity of its interface with the second absorbent layer, especially in the interface, based on the total weight of the superabsorbent polymer (A). ), this degree of mixing can be considered as a state that basically does not mix with each other.

For the superabsorbent polymer (A), the description for the first aspect of the invention also applies. On the other hand, the superabsorbent polymer (B) is a polymer satisfying the following condition (4).

(4) The absorption rate of physiological saline (hereinafter sometimes simply referred to as water absorption rate) of the superabsorbent polymer (B) is not less than 5g/30sec/0.3g, preferably 6-15g/30sec/0.3g, and this value is Measured according to the demand wettability (DW) method.

If the above-mentioned water absorption rate is lower than 5g/30sec/0.3g, the superabsorbent polymer itself absorbs liquid too quickly, resulting in decreased ability to retain excreted liquid, and thus cannot reduce the amount of the fibrous base material.

The DW method for measuring the water absorption rate will be described later in Examples.

As long as the condition (4) is satisfied, the superabsorbent polymer (B) is not particularly limited. Examples of suitable superabsorbent polymers (B) are: sodium polyacrylate, acrylic acid-vinyl alcohol copolymers, crosslinked sodium polyacrylates, starch-acrylic acid graft copolymers, isobutylene-maleic anhydride copolymers and their saponification products, potassium polyacrylate, and cesium polyacrylate. These polymers are used in the form of particles or fibers.

Based on the total weight of (A) and (B) as 100, the weight ratio of superabsorbent polymers (A) and (B) is preferably 90-30:10-70, especially 80-50:20-50.

If the ratio of the superabsorbent polymer (A) exceeds 90, the retaining ability of excreted liquid will decrease. If it is lower than 30, gel blocking occurs, resulting in lowered absorbency.

From the viewpoint of obtaining a thin absorbent article, the total weight of superabsorbent polymer (A) and superabsorbent polymer (B) is preferably not less than 45% by weight of the total weight of the absorbent body, especially 45-90% by weight, especially 50-80wt%.

The structure of the absorbent body according to these embodiments will now be explained with reference to Figs. 6-9.

The absorbent body 4 shown in FIG. 6 is a four-layer structure comprising a first absorbent layer 20 made of a superabsorbent polymer (A) 72, a second absorbent layer 30 comprising a superabsorbent polymer (B) 73, and a As for the absorbent paper layer 50 , the absorbent paper layer is made of conventional absorbent paper containing ordinary pulp fibers and the like, and is placed on the outside of the first absorbent layer 20 and the second absorbent layer 30 . In this structure, the superabsorbent polymer (A) 72 and the superabsorbent polymer (B) 73 are disposed substantially not mixed with each other.

In the second absorbent layer 30, a superabsorbent polymer (B) 73 is mixed with a fibrous base material 74.

The absorbent body 4a shown in Figure 7 is a four-layer structure, including a first absorbent layer 20a comprising a superabsorbent polymer (A) 72a, a second absorbent layer 30a made of a superabsorbent polymer (B) 73a, and a As for the absorbent paper layer 50a, the absorbent paper layer is made of absorbent paper and placed on the outside of the first absorbent layer 20a and the second absorbent layer 30a. In this structure, the superabsorbent polymer (A) 72a and the superabsorbent polymer (B) 73a are disposed substantially not mixed with each other.

In the first absorbent layer 20a, a superabsorbent polymer (A) 72a is mixed with a fibrous base material 74a.

The absorber 4b shown in Figure 8 is a four-layer structure, including a first absorbent layer 20b comprising a superabsorbent polymer (A) 72b, a second absorbent layer 30b comprising a superabsorbent polymer (B) 73b, and a pair of The absorbent paper layer 50b, which is made of absorbent paper, is placed outside the first absorbent layer 20b and the second absorbent layer 30b. In this structure, the superabsorbent polymer (A) 72b and the superabsorbent polymer (B) 73b are substantially not mixed with each other.

In the first absorbent layer 20b and the second absorbent layer 30b, superabsorbent polymers (A) 72b and (B) 73b are mixed with a fibrous base material 74b, respectively.

The absorbent body 4c shown in Figure 9 has a first absorbent layer 20c made of a superabsorbent polymer (A) 72c, and a second absorbent layer 30c made of a superabsorbent polymer (B) 73c, the superabsorbent polymer (A) ) 72c and superabsorbent polymer (B) 73c are substantially not mixed with each other.

The first absorbent layer 20c and the second absorbent layer 30c are stacked apart from each other, among which is the fibrous base material layer 40c. Therefore, the absorbent body 4c has a five-layer structure comprising a first absorbent layer 20c, a second absorbent layer 30c, a fibrous base material layer 40c, and a pair of absorbent paper layers 50c made of absorbent paper, and Placed on the outside of the first absorbent layer 20c and the second absorbent layer 30c.

The absorbent paper layer in Figures 6-9 is optional, or the absorbent paper layer is only provided on one side of the absorbent body.

The absorbent body in the above embodiment preferably has a basis weight of 100-1000 g/m ² and a thickness of 0.5-5.0 mm.

Absorbent bodies of these embodiments are prepared in the following manner. The preparation method of absorbent body 4 and 4a as Fig. 6 and 7 is: at first the mixture of superabsorbent polymer and fibrous base material is formed into fiber web in usual way, obtains the mixture that comprises superabsorbent polymer and fibrous base material The first and second absorbent layers are then formed on the resulting layer with a layer comprising another superabsorbent polymer, and finally the resulting layer is sandwiched between a pair of absorbent papers.

The preparation method of the absorbent body 4b shown in Figure 8 is as follows: first, the mixture of the superabsorbent polymer and the fibrous base material is shaped into a fiber web in a usual manner to form the first and second absorbent layers respectively, and the two layers Put on top of each other, then sandwich the resulting layers between a pair of absorbent papers.

The preparation method of the absorbent body 4c shown in Figure 9 is as follows: first, form a fibrous base material layer in a usual manner, superabsorbent polymers (A) and (B) are respectively placed on the surface and back of the fibrous base material layer, and then The resulting layer was sandwiched between a pair of absorbent papers.

According to the disposable diaper 1 of the embodiment of the absorbent body having any one of the above-mentioned structures, it has smooth absorbency for the first urination, and even if the absorbent body used is thin, the absorbent article does not lose weight when the next step of urination is performed. Absorptive hindrance due to gel blocking occurs. Therefore, the disposable diaper 1 has excellent absorbency and does not cause leakage.

Although the absorbent article of the present invention (including the first and second aspects of the present invention) has been described in detail according to the preferred embodiments, the present invention should not be considered limited to these embodiments and various modifications can be made thereto. Variations and improvements.

For example, in the embodiment shown in Figure 3, wherein the absorbent body 4 comprises a single fibrous base material layer 15 and a single polymer-containing layer 16, it may also comprise more than one fibrous base material layer 15 and/or More than one polymer-containing layer 16.

In the absorbent body 4 shown in FIG. 5, pulp fibers are used as the fiber base 64, but alkalized pulp, carboxymethylated pulp, rayon, cotton, etc. may be used instead of or mixed with pulp fibers.

In FIG. 5, a sheet containing the above-mentioned thermoplastic resin particles or fibers may be inserted into the absorbent body 4 and the top sheet 2 or between the absorbent body 4 and the back sheet 3, thereby incorporating the thermoplastic resin particles or fibers in the sheet into Thermal bonding with surface material 2 or bottom material 3.

The absorbent body 4 as shown in Fig. 5 may be replaced by including a pair of sheets containing thermoplastic resin particles or fibers 65, and then a layer of superabsorbent polymer particles 63 is inserted between the two sheets.

The above-mentioned embodiment can also share the above explanation.

The present invention is applicable not only to the above-mentioned disposable diapers, but also to other absorbent articles such as sanitary napkins, incontinence pads, and nursing pads.

Example

The advantages of the absorbent article of the present invention will be further described according to the examples, but it should be understood that the present invention is not intended to be limited thereto.

In Examples and Comparative Examples, the saline absorbency according to the centrifugal dehydration method, the liquid passage time, the saline absorbency of the superabsorbent polymer according to the DW method, and the saline saturation of the fibrous base material layer will be measured according to the following methods absorb. Determination of saline absorbency of superabsorbent polymers according to the centrifugation method:

1 g of superabsorbent polymer was swollen with 150 ml of physiological saline for 30 minutes. The swollen polymer was put into a 250-mesh nylon mesh bag, then dehydrated in a centrifugal separator at 143G for 10 minutes, and the total weight (including the weight of the bag) was measured. Calculate the absorbency (g/g) of physiological saline according to the centrifugation method according to the following formula (1):

Absorbency of physiological saline according to centrifugation = [(total weight)-(weight of nylon mesh bag)-(weight of polymer)-(weight of physiological saline remaining on nylon mesh bag)]/(weight of polymer ) (I) Liquid transit time of superabsorbent polymer:

Put 0.5 g of superabsorbent polymer P into device 80 (the inner diameter of the cylinder part is 25 mm, the glass burette of about 250 mm in length) as shown in Figure 10, inject excess saline W on it then, with The superabsorbent polymer P is allowed to swell to equilibrium. After reaching equilibrium, adjust the liquid level to 200mm, and then unscrew the cock (inner diameter: 4mm). After confirming that the swollen polymer P had completely settled down as shown in Fig. 10, the cock was closed. Measure the time required for physiological saline W to pass through the distance between the two scales L and M (as shown in Figure 10, equivalent to 50ml), and take this value as the liquid passing time (sec). Saline Saturation Absorption of Fibrous Base Layer:

A 20cm×15cm (300cm ² ) sample was cut from the fiber base material layer, immersed in 150ml of physiological saline for 30 minutes, and then placed on an 80-mesh metal mesh to allow the liquid to leak. After 30 minutes of draining, the total weight (including the weight of the metal mesh) was measured to calculate the saturated absorption (g/cm ² ) of physiological saline according to the formula (II):

Saturation absorption of normal saline=[(gross weight)-(weight of metal mesh)-(weight of fiber base material layer)-(weight of physiological saline remaining on metal net)]/(area of fiber base material layer)( II) Determination of the absorption rate of physiological saline according to the DW method:

An apparatus 81 as shown in Figure 11, which is known as a volumetric wettability tester, is used. As shown in Figure 11, inject physiological saline W into the tester, make the two liquid levels equal, and then 0.3g of superabsorbent polymer P is dispersed on bracket 82 (diameter: 70mmφ; No. 1 glass filter, on which placed on No. 2 filter paper). The water absorption at the time of dispersing the polymer was counted as 1, and the water absorption after 30 sec was measured by reading the scale on the buret 83 indicating the drop in the liquid level of the physiological saline W. The measured value was taken as the absorption rate of physiological saline. Example 1

A small amount of water is dispersed on a dry-processed nonwoven pulp sheet (1) (which is prepared by laying the refined pulp in a stacked form and then binding the fibers into the sheet with an adhesive) , the saturated absorption of physiological saline of the sheet was 0.15 g/cm ² , and then the superabsorbent polymer (I) (crosslinked sodium polyacrylate particles with high crosslink density on its surface portion) was uniformly dispersed on the sheet On the material, a polymer-containing layer was formed. The superabsorbent polymer had a physiological saline absorbency of 29 g/g and a liquid transit time of 12 sec as measured by the centrifugal dehydration method. On the polymer-containing layer was placed pulp absorbent paper (2) (obtained from pulp by wet-laid papermaking) which had a saturated absorption of physiological saline of 0.04 g/cm ² . The obtained layer was pressed to obtain an absorbent body (a) of a disposable diaper. The proportion of the superabsorbent polymer (I) was 59% by weight based on the total weight of the absorbent body (a). The total physiological saline saturated absorption of the fibrous base layer in the absorbent body (a) was 0.19 g/cm ² .

On the side of non-woven pulp sheet (1) prepared by dry method, a hydrophilic polypropylene non-woven fabric is placed as a surface material, and then a polyethylene film is placed on the side of pulp absorbent paper (2) as a bottom material, thus obtaining Disposable diaper (A). The resulting disposable diaper (A) had a thickness of 2.0 mm at a load of 2.5 g/cm ² . Example 2

Absorbent body (b) and disposable diaper (B) for disposable diapers are manufactured in the same manner as in Example 1, but the difference is that superabsorbent polymer (II) (its surface portion is highly cross-linked) Density of cross-linked sodium polyacrylate particles, assuming that the cross-link density is lower than that of superabsorbent polymer (I)) instead of superabsorbent polymer (I), the superabsorbent polymer (II) is determined according to centrifugation method The absorption rate of physiological saline is 37g/g, and its liquid transit time is 17sec.

The proportion of the superabsorbent polymer (II) was 59% by weight based on the total weight of the absorbent body (b). The total physiological saline saturated absorption of the fibrous base layer in the absorbent body (b) was 0.19 g/cm ² . The resulting disposable diaper (B) had a thickness of 2.0 mm at a load of 2.5 g/cm ² . Example 3

A small amount of water is dispersed on the dry-processed nonwoven pulp sheet (1), and then the superabsorbent polymer (II) is uniformly dispersed on the sheet to form a polymer-containing layer. A water-repellent polypropylene nonwoven fabric (3) was placed on the polymer-containing layer, and the resulting layer was pressed to obtain an absorbent body (c) of a disposable diaper. The proportion of the superabsorbent polymer (II) was 56% by weight based on the total weight of the absorbent body (c). The total physiological saline saturated absorption of the fibrous base layer in the absorbent body (c) was 0.15 g/cm ² .

A disposable diaper (C) was produced in the same manner as in Example 1, except that a dry-processed nonwoven pulp sheet (1) was used for the absorbent body (c) as the topsheet side. The resulting disposable diaper (C) had a thickness of 2.2 mm at a load of 2.5 g/cm ² . Example 4

The wood pulp is refined, and then laid to form a pulp layer (4) with a saturated absorption of physiological saline of 0.12g/cm ² . A mixture of refined wood pulp and superabsorbent polymer (I) is placed on the pulp layer (4) to form a polymer-containing layer. The resulting layer was pressed to obtain an absorbent body (d) for a disposable diaper. The proportion of the superabsorbent polymer (I) was 63% by weight based on the total weight of the absorbent body (d). The total physiological saline saturated absorption of the fibrous base layer in the absorbent body (d) was 0.12 g/cm ² .

A disposable diaper (D) was produced in the same manner as in Example 1, except that the pulp layer (4) of the absorbent body (d) was used as the topsheet side. The resulting disposable diaper (D) had a thickness of 2.5 mm at a load of 2.5 g/cm ² . Example 5

A small amount of water is dispersed on the pulp absorbent paper (2), and then the superabsorbent polymer (II) is uniformly dispersed on the absorbent paper to form a polymer-containing layer. On the polymer-containing layer, a hydrophilic polypropylene nonwoven fabric (5) having a saturated saline absorption of 0.08 g/cm ² was placed, and the resulting layer was pressed to obtain an absorbent body of a disposable diaper ( e). The proportion of the superabsorbent polymer (II) was 67% by weight based on the total weight of the absorbent body (e). The total physiological saline saturated absorption of the fibrous base layer in the absorbent body (e) was 0.12 g/cm ² .

A disposable diaper (E) was produced in the same manner as in Example 1, except that the pulp absorbent paper (2) of the absorbent body (e) was used as the topsheet side. The resulting disposable diaper (E) had a thickness of 1.7 mm at a load of 2.5 g/cm ² . Example 6

The superabsorbent polymer (I) is uniformly dispersed on the pulp layer (4) to form a polymer-containing layer. Another pulp layer (4) is placed on the polymer-containing layer and then pressed. A small amount of latex binder was dispersed on and under the resulting layer, followed by drying to obtain a pulp layer (4) nonwoven fabric, whereby an absorbent body (f) for disposable diapers was produced. The proportion of the superabsorbent polymer (I) was 53% by weight based on the total weight of the absorbent body (f). The total physiological saline saturated absorption of the fibrous base layer in the absorbent body (f) was 0.24 g/cm ² .

A disposable diaper (F) was manufactured in the same manner as in Example 1, except that the pulp layer (4) on the F side of the absorbent body (f) was used as the topsheet side. The resulting disposable diaper (F) had a thickness of 2.6 mm at a load of 2.5 g/cm ² . Comparative example 1

Absorbent body (g) and disposable diaper (G) for disposable diapers are produced in the same manner as in Example 4, but the difference is that the pulp layer (6) is used instead of the pulp layer (4), the pulp layer (6) has a saturated absorption of physiological saline of 0.40 g/cm ² , which is produced by refining wood pulp and then laying the refined wood pulp.

The proportion of the superabsorbent polymer (I) was 36% by weight based on the total weight of the absorbent body (g). The total physiological saline saturated absorption of the fibrous base layer in the absorbent body (g) was 0.40 g/cm ² . The resulting disposable diaper (G) had a thickness of 5.5 mm at a load of 2.5 g/cm ² . Comparative example 2

Absorbent body (h) and disposable diaper (H) for disposable diapers are produced in the same manner as in Example 1, but the difference is that superabsorbent polymer (III) is used (the whole particle is relatively uniform cross-section). The cross-linked sodium polyacrylate particle of linked density) replaces superabsorbent polymer (I) used in the embodiment 1, and the physiological saline absorption rate of this superabsorbent polymer (III) is 3g/g measured according to centrifugal dehydration method, its The general transit time is 33sec.

The proportion of superabsorbent polymer (III) was 59% by weight based on the total weight of the absorbent body (h). The total physiological saline saturated absorption of the fibrous base layer in the absorbent body (h) was 0.19 g/cm ² . The resulting disposable diaper (H) had a thickness of 2.0 mm at a load of 2.5 g/cm ² . Comparative example 3

Absorbent body (i) and disposable diaper (I) for disposable diapers are produced in the same manner as in Example 4, but the difference is that superabsorbent polymer (IV) is used (the whole particle is relatively uniform cross-section Cross-linked sodium polyacrylate particles with a cross-link density much higher than that of the superabsorbent polymer (III)) instead of the superabsorbent polymer (I) used in Example 4, the superabsorbent polymer ( IV) Absorption rate of physiological saline measured by centrifugal dehydration method is 20g/g, and its liquid passage time is 14sec.

The proportion of superabsorbent polymer (IV) was 63% by weight, based on the total weight of the absorbent body (i). The total physiological saline saturated absorption of the fibrous base layer in the absorbent body (i) was 0.12 g/cm ² . The resulting disposable diaper (I) had a thickness of 2.5 mm at a load of 2.5 g/cm ² .

A urine leakage test was performed on the disposable diapers prepared in Examples 1-6 and Comparative Examples 1-3. For each example or comparative example, 200 disposable diapers were tested in actual use by 10 wearers. The test results obtained are listed in Table 1 together with the thickness of the tested diapers under a load of 2.5 g/cm ² .

Table 1 Percentage of urine leakage from diapers The thickness of the diaper under a load of 2.5g/ ^cm2 Example 1 1.5% 2.0mm 2 0.5% 2.0mm 3 1.5% 2.2mm 4 1.0% 2.5mm 5 1.5% 1.7mm 6 1.0% 2.6mm comparative example 1 2.5% 5.5mm 2 4.5% 2.0mm 3 5.0% 2.5mm Example 7

A suction heat-bonded nonwoven fabric (unit weight: 25 g/m ² ) was rendered hydrophilic with a surfactant, and then used as a surface sheet. The nonwoven fabric was made of a core/sheath type composite fiber comprising polypropylene as a core and polyethylene as a sheath, the fiber diameter was 3 denier, and the cut length was 51 mm.

An absorber (unit weight: 250 g/m ² ) was placed on the nonwoven fabric, the absorber comprising a fabric of a homogeneous mixture of: 60 parts by weight of refined pulp fibers, 5 parts by weight of polyethylene fibers (melting point: 110° C.), and 100 parts by weight of cross-linked sodium polyacrylate particles as a superabsorbent polymer.

The resulting layer was treated with hot air at 135°C to thermally bond the non-woven fabric top sheet and the polyethylene fibers in the absorbent body, thereby making the top sheet and the absorbent body integral.

A polyethylene sheet was placed as a backsheet on the absorbent body to obtain a disposable diaper.

The cross-linked sodium polyacrylate particles used above had an increased cross-linking density in their surface portion, and had a physiological saline absorbency of 29 g/g and a liquid transit time of 12 sec as measured by the centrifugation method. Example 8

Disposable diapers were produced in the same manner as in Example 7, but the difference was that the polyethylene fibers in Example 7 were replaced by polyethylene particles with an average particle diameter of 50 μm. In terms of the total weight of the absorbent body, the The proportion of polyethylene is 10wt%. Example 9

The microporous sheet as the backsheet was placed on the topsheet/absorbent structure prepared in Example 7 (before hot air treatment). The resulting three-layer structure is subjected to thermal embossing treatment, whereby the surface material and polyethylene fibers are integrated by thermal bonding, and at the same time, the bottom material and polyethylene fibers are integrated by thermal bonding, and finally a disposable diaper.

The base material used above is a microporous sheet obtained by the following method: uniformly mixing 40 parts by weight of linear low density polyethylene (density: 0.925g/cm ² ; melt index: 2.1g/10min) in a twin-screw kneader ), 60 parts by weight of stearic acid-treated calcium carbonate, and 4 parts by weight of trimethylolpropane adipate stearate, the mixture was molded into sheets by blown film extrusion, and then stretched at 2.1 The stretch ratio is uniaxially stretched the resulting sheet. Example 10

Disposable diapers were produced in the same manner as in Example 7, but the difference was that the superabsorbent polymers in Example 7 were replaced by superabsorbent polymers with a physiological saline absorption rate of 38 g/g and a liquid transit time of 16 sec as measured by the ion separation method. The superabsorbent polymer used. Comparative example 4

Disposable diapers were produced in the same manner as in Example 7, except that the proportions of polyethylene fibers and superabsorbent polymers were changed to 30 wt% and 33 wt%, respectively, based on the total weight of the absorbent body. Reviews for Disposable Diapers:

The disposable diapers prepared in Examples 7-10 and Comparative Example 4 were evaluated for (1) the liquid fast absorbency of the absorbent body and the degree of separation between the absorbent body and the topsheet, and (2) the leakage ratio according to the following methods. evaluation. The results obtained are listed in Table 2 below. (1) Rapid liquid absorbency of the absorber

Disposable diapers were cut into samples of a size of 20 cm x 20 cm, and then 50 ml of physiological saline was poured thereon at a time. The quickness of liquid absorption and the degree of separation of the absorbent body from the topsheet were evaluated based on the following criteria. Repeated pouring of saline (50ml) until saturation of fluid absorption was achieved. Rapidity of liquid absorption:

A...The liquid is absorbed quickly leaving no residue on the surface of the sample

B...a little liquid remains on the surface, and the liquid will flow on the surface

C...Liquid is slowly absorbed, and the separation of the absorber and the surface material flows on the surface

A...no separation observed

C... Observed separation (2) leakage ratio

The urine leakage survey was conducted on 10 ordinary wearers to obtain the leakage ratio of the tested disposable diapers.

Table 2 Rapid liquid absorbency/separation of absorbent body and topsheet Leak ratio first absorption further absorption (%) Example 78910 A/AA/AA/AA/A A/AA/AA/AA/A 1.51.41.81.5 comparative example 4 B/A B/C 7.8

In the disposable diapers (the present invention) of Examples 7-10, the top sheet is integrally formed with the absorber by forming the absorber with specific components in a specific ratio, and the superabsorbent polymer contained in the absorber also has specific physical properties. From the results in Table 2, it can be clearly seen that these disposable diapers are much better than the disposable diapers of Comparative Example 4, which is reflected in the quickness of liquid absorption, no separation of the surface sheet and the absorbent body, and liquid-repellent properties. leak performance. Example 11

Superabsorbent polymer (A-1) (in its surface part, cross-linked sodium polyacrylate particles have a higher cross-linking density) was dispersed on absorbent paper with a unit weight of 19 g/m ² to form a unit weight of 150 g /m ² of the first absorbent layer, wherein the superabsorbent polymer has a physiological saline absorbency of 29 g/g measured according to the centrifugal dehydration method, and a liquid passing time of 12 sec.

A fabric formed from a homogeneous mixture of 100 parts by weight of refined pulp fibers and 50 parts by weight of superabsorbent polymer (B-1) is placed on the first absorbent layer to form a second absorbent layer with a unit weight of 150 g/m ² , wherein, the saline absorption rate of the superabsorbent polymer here is 6.5g/30sec/0.3g. The weight ratio of superabsorbent polymer (A-1) to superabsorbent polymer (B-1) was 75:25. Then, an absorbent paper with a unit weight of 19 g/m ² was placed on the second absorbent layer to obtain an absorbent body as shown in FIG. 6 .

A nonwoven fabric (unit weight: 25 g/m ² ), which is made of core/sheath type combined fibers including Polypropylene and polyethylene as a sheath have a fiber diameter of 3 denier, a cut length of 51 mm, and are hydrophilic. A polyethylene sheet was placed as a backsheet on the second absorbent layer side to obtain a disposable diaper as shown in FIG. 1 .

The obtained absorbent bodies and disposable diapers were tested for water absorbency and leakage ratio according to the following test methods. The results obtained are shown in Table 3. Evaluation of absorption performance:

The absorbent body was cut into a sample of 20 cm x 20 cm size, and 50 ml of physiological saline was poured thereon at a time. The liquid quick absorbency of the absorbent body was evaluated based on the following criteria. Repeated pouring of saline (50ml) until saturation of fluid absorption was achieved. The results in Table 3 are for the first and further absorptions.

A...The liquid is absorbed quickly leaving no residue on the surface of the sample

B...a little liquid remains on the surface, and the liquid will flow on the surface

C...Liquid is slowly absorbed and flows over the surface to leak ratio:

A survey about urine leakage was carried out on 10 ordinary wearers, and the leakage ratio of the test disposable diaper was obtained according to the following equation (III):

Leak ratio (%)=(the diaper quantity that leaks)/(the total quantity of diaper used) * 100 (III) embodiment 12

An absorbent body and a disposable diaper were produced in the same manner as in Example 11, except that the basis weight of the first absorbent layer was changed to 75 g/m ² , and the amount of the superabsorbent polymer (B-1) was increased to 100 parts by weight to increase the weight ratio of superabsorbent polymer (A-1)/superabsorbent polymer (B-1) to 50:50.

The resulting absorbent body and disposable diapers were evaluated for water absorbency and leakage ratio in the same manner as in Example 11. The results obtained are shown in Table 3. Example 13

An absorbent body having the structure shown in FIG. 9 and a disposable diaper having the structure shown in FIG. 1 were produced in the same manner as in Example 11, except for the following differences.

A superabsorbent polymer (B-2) having a saline absorption rate of 10g/30sec/0.3g was dispersed on a dry-laid pulp nonwoven fabric with a basis weight of 50g/ ^m2 to obtain a basis weight of 50g/ ^m2 , obtained by This forms the absorbent paper layer and the second absorbent layer.

Then, a nonwoven fabric (unit weight: 22 g/m ² ), which is made of core/sheath type combined fibers, is placed on the second absorbent layer of the absorbent body to form a fibrous base layer. The fibers consisted of polyethylene terephthalate as a core and polyethylene as a sheath, had a fiber diameter of 2 denier, a cut length of 51 mm, and were hydrophilic. Further, the same superabsorbent polymer (A-1) as in Example 11 was placed on the fibrous base layer to form a basis weight of 150 g/m ² . The weight ratio of superabsorbent polymer (A-1) to superabsorbent polymer (B-2) was 75:25.

The resulting absorbent body and disposable diapers were evaluated for water absorbency and leakage ratio in the same manner as in Example 11. The results obtained are shown in Table 3. Comparative example 5

Absorbent bodies and disposable diapers were manufactured in the same manner as in Example 11 except for the following points.

A fabric made of a homogeneous mixture of 100 parts by weight of refined pulp fibers and 170 parts by weight of superabsorbent polymer (A-1) (crosslinked sodium polyacrylate particles having a high crosslink density at its surface portion) was laid on On absorbent paper with a unit weight of 19 g/m ² , the superabsorbent polymer (A-1) had a physiological saline absorbency of 29 g/g measured by centrifugation and a liquid transit time of 12 sec, and was further laminated on the fabric. Absorbent paper with a unit weight of 19 g/m ² .

The resulting absorbent body and disposable diapers were evaluated for water absorbency and leakage ratio in the same manner as in Example 11. The results obtained are shown in Table 3. Comparative example 6

Absorbents and disposable diapers were produced in the same manner as in Comparative Example 5, except that superabsorbent polymer (B-1) with a saline absorption rate of 6.5g/30sec/0.3g was used instead of superabsorbent polymer Object (A-1).

The resulting absorbent body and disposable diapers were evaluated for water absorbency and leakage ratio in the same manner as in Example 11. The results obtained are shown in Table 3. Comparative example 7

Absorbent bodies and disposable diapers were manufactured in the same manner as in Example 11 except for the following points.

A fabric made from a homogeneous mixture of 100 parts by weight of refined pulp fiber, 150 parts by weight of superabsorbent polymer (A-1) and 50 parts by weight of superabsorbent polymer (B-1) was laid on a unit weight of 19 g /m ² of absorbent paper to obtain a unit weight of 300 g/m ² (the weight ratio of superabsorbent polymer (A-1) to superabsorbent polymer (B-1) is 75:25).

The resulting absorbent body and disposable diapers were evaluated for water absorbency and leakage ratio in the same manner as in Example 11. The results obtained are shown in Table 3.

table 3 first absorption further absorption Leakage ratio (%) Example 11 A A 1.2 12 A A 1.6 13 A A 1.5 comparative example 5 C A 5.3 6 A C 7.7 7 A B 4.4

Claims (15)

1, a kind of absorbent commodity, it has liquid permeability top layer material, non-liquid permeability backsheet and is embedded in liquid-keeping absorber between them, wherein, described absorber meets the following conditions (1), and is included in super-absorbent polymer in the described absorber meet the following conditions (2) and (3):

(1) described absorber mainly comprises fiber base material and super-absorbent polymer, and with total restatement of described absorber, the ratio of described super-absorbent polymer is for being no less than 45 weight %,

(2) according to the centrifuge dehydration method, the normal saline absorbability of described super-absorbent polymer is for being no less than 25g/g,

(3) liquid of described super-absorbent polymer is no more than 20 seconds by the time, and this measures according to following method: with the described super-absorbent polymer of 0.5g put into be equipped with normal saline, cross-sectional area is 4.91cm ²In the cylinder of (internal diameter is 25mm φ),, after the super-absorbent polymer of swelling sinks, measure the 50ml normal saline then by the required time of described super-absorbent polymer so that make described super-absorbent polymer swelling until saturated with normal saline.

2, absorbent commodity as claimed in claim 1, wherein, the normal saline absorbability of described super-absorbent polymer is 25-65g/g.

3, absorbent commodity as claimed in claim 1, wherein, described absorber comprises two or more layer, at least one layer comprises described fiber base material, and another layer comprises the mixture of described super-absorbent polymer or described super-absorbent polymer and described fiber base material at least, and these layers are stacked alternately together mutually.

4, absorbent commodity as claimed in claim 1, wherein, described absorber comprises three layers, and one of them layer comprises the mixture of described super-absorbent polymer or described super-absorbent polymer and described fiber base material, and this layer be clipped in two comprise identical or different fiber base material the layer among.

5, absorbent commodity as claimed in claim 3, wherein, described absorber has the one or more layers that comprises the fiber base material, and total normal saline saturated absorption of this layer is not less than 0.1g/cm ²

6, absorbent commodity as claimed in claim 4, wherein, described two layers comprise total normal saline saturated absorption and are not less than 0.1g/cm ²Described fiber base material.

7, as the absorbent commodity of claim 3 or 4, wherein, the layer that at least one is described to comprise described fiber base material is by comprising that the hydrophilic fibre sheet material makes.

8, absorbent commodity as claimed in claim 1, wherein, described top layer material comprises the thermoplastic resin fibre; With total restatement of described absorber, described absorber comprises the described super-absorbent polymer of 45-90wt% and thermoplastic resin particle or the fiber of 0.5-20wt%; And described top layer material be with described absorber in described thermoplastic resin particle or the fiber hot adhesion together.

9, absorbent commodity as claimed in claim 8, wherein, described backsheet is the non-liquid permeability sheet material that contains thermoplastic resin, and described backsheet be with described absorber in described thermoplastic resin particle or the fiber hot adhesion together.

10, absorbent commodity as claimed in claim 8, wherein, described backsheet is to contain the microperforated sheet that the sheet material of vistanex and filler obtains by uniaxial tension at least.

11, a kind of absorbent commodity, it has liquid permeability top layer material, non-liquid permeability backsheet and is embedded in liquid-keeping absorber between them, wherein, described absorber has first absorbed layer and second absorbed layer, first absorbed layer comprises the super-absorbent polymer (A) that satisfies above-mentioned condition (3), and second absorbed layer comprises the super-absorbent polymer (B) of meet the following conditions (4); Described super-absorbent polymer (A) and described super-absorbent polymer (B) exist in the mode that can not mix; And described first absorbed layer is arranged near described top layer material one side, and described second absorbed layer is arranged near described backsheet one side:

(4) the normal saline absorbance of described super-absorbent polymer (B) is no less than 5g/30sec/0.3g, and this value is held wettability (DW) method according to need and recorded.

12, as the absorbent commodity of claim 11, wherein, described super-absorbent polymer (A) and weight ratio (B) are 90-30: 10-70.

13, as the absorbent commodity of claim 11, wherein, in described first absorbed layer and described second absorbed layer at least one by described super-absorbent polymer (A) or (B) and the mixture of hydrophilic fibre base material form.

14, as the absorbent commodity of claim 11, wherein, described first absorbed layer and described second absorbed layer separate lay by the fiber base bed of material, and this fiber base bed of material is arranged among the above-mentioned absorbed layer, and contains the fiber base material.

15, as the absorbent commodity of claim 11, wherein, with total restatement of described absorber, the gross weight of described super-absorbent polymer (A) and described super-absorbent polymer (B) is not less than 45wt%.

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