JP2000201975A - Multifunctional sheet absorber having plural-layer structure and absorber product using this absorber as one element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart a multifunction by divisibly distributively constituting an absorbing area phase composed of an absorbing layer and a nonwoven fabric- like base material for carrying the absorbing layer and a diffusion acquisition area phase mainly composed of only the nonwoven fabric-like base material hardly existing in a highly water absorptive resin. SOLUTION: A basic structure of a sheet-like absorber is formed as a two- layer structure of a high density layer 11 and a bulky low density layer 12, and is composed of a nonwoven fabric-like base material 10 having two functions of diffusibility and acquirability and highly water absorptive resin particles 20 stably joined to and carried on fiber constituting the low density layer 12 by a joining component 13. An absorbing area phase having the highly water absorptive resin particles 20 distributed in prescribed density and a duffusion acquisition area phase substantially nonexistent in the particles 20 are made to clearly divisibly exist to thereby effectively exhibit respectively different functions and roles to sufficiently reveal an absorber function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multifunctional absorbent having a multilayer structure, and an absorbent product using the same as a component, such as a diaper for children, a diaper for adults, an incontinence article for women, and a blood absorbent. The present invention relates to an absorbent product such as an ultra-thin sheet-shaped highly water-absorbent absorbent used for an absorbent product such as a breast milk pad.

[0002]

2. Description of the Related Art Conventionally, absorbent products such as diapers and sanitary wares are composed mainly of super absorbent resin (SAP) and flap-like wood pulp, but are thinner and more stable in shape. SAP in non-woven base material
The development of a sheet-shaped absorber carrying the compound has been energetically carried out.

As an example of the development of a sheet-shaped absorbent, for example, a foamed acrylic acid bulk polymer gel formed into a film (Japanese Patent Application Laid-Open Nos. 9-137072 and 10-12)
No. 0818), a web obtained by directly impregnating an acrylic acid monomer into a web and subjecting the web to redox polymerization (for example, EP-A-0 223 908), and bonding between SAP particles and a base material using a cellulose acetate solution as a binder ( JP-A-9-299399) and SAP using microfibrillar cellulose as a binder.
What bonded particles and a substrate (Japanese Patent Laid-Open No. 10-1)
No. 68230) and the like.

[0004]

However, all of these prior arts are aimed at enhancing the function as an absorber, but in order to use this absorber in an absorbent product, it is necessary to use a liquid. It is necessary to combine a substrate with a diffusion function and an acquisition (temporary storage) function,
No attempt has been made to provide higher-order multiple functions to the absorber itself.

[0005] If the diffusion function and the acquisition function can be incorporated into the structure of the absorber itself, the structure of the absorber product should be simplified, more rationalized, and resource saving. However, it is difficult to obtain such a multifunctional absorber by a conventional method of forming a mat by airflow or a method of manufacturing a sheet-shaped absorber, and the necessary cost increases.

[0006]

An object of the present invention is to provide a composite absorbent comprising a non-woven fabric base material and an SAP, a SAP, and a binder that binds the SAP and the non-woven fabric constituent fibers. A multi-layer nonwoven fabric having a diffusion layer made of high-density hydrophilic fibers having a permeation and diffusion effect by a capillary effect and an acquisition layer combined with a bulky and high resilience value (elastic recovery rate)
It is possible to solve the problem by allowing the P particles to be stably supported (trapped) only in a predetermined area, and combining the areas of only the nonwoven fabric having a diffusion / acquisition effect with an appropriate distribution ratio. This will spread
It is possible to obtain a multifunctional sheet-shaped absorber excellent in absorbability as well as in fixation of the absorbed liquid at the same time as the acquisition effect.

That is, the multifunctional sheet-shaped absorbent of the present invention comprises an absorbent layer containing a superabsorbent resin as a main component, a nonwoven fabric substrate carrying the superabsorbent resin, and a space between the superabsorbent resins. What is claimed is: 1. A sheet-shaped absorber comprising three components of a superabsorbent resin and a binder component for bonding between a substrate and a substrate, wherein the absorbent layer and a nonwoven substrate supporting the absorbent layer are provided on the surface of the sheet-shaped absorber. And the diffusion / acquisition region phase (B phase), which consists essentially of only the nonwoven fabric substrate, in which the superabsorbent resin hardly exists, is distributed so as to be distinguishable from each other. It is characterized by having.

The multifunctional sheet-shaped absorbent of the present invention preferably has an absorption amount under pressure (AUL) when absorbing 0.9% saline under a pressure of 20 g / cm ² , in an absorption region phase (AUL). (A phase) has an absorption amount of at least 20 g / g, and the coexistence region phase (AB phase) in which both the absorption region phase and the diffusion / acquisition region phase (B phase) exist has an absorption amount of 12 g / g or more.

In a preferred embodiment of the present invention, the nonwoven fabric-like substrate supporting the superabsorbent resin is a so-called diffusion layer (P) comprising a fiber layer having relatively high hydrophilicity and high density.
Consisting of a fiber layer with relatively low hydrophilicity and low density,
And a so-called acquisition layer (Q).

The binder component is, for example, a fibril-like fine fiber having a hydration property, a fibril-like fine fiber having a hydration property, and a short fibrous heat-fusible synthetic fiber having a cut length of 10 mm or less coexisting. .

[0011] The present invention also provides an absorbent product comprising a surface sheet that comes into contact with the skin in a use state, a backsheet having leakproofness, and an absorbent interposed therebetween.
An absorbent product using the above-mentioned multifunctional sheet-shaped absorbent is provided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the basic structure of a multifunctional sheet-shaped absorber having a multilayer structure according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the basic structure of the sheet-shaped absorber of the present invention includes a high-density layer 11 and a bulky low-density layer 12.
A nonwoven fabric substrate 10 having two functions of diffusivity and acquisition properties, which are composed of two layers, and supported between fibers constituting the low-density layer 12, and stably bonded to the fibers by a bonding component 13. And SAP particles 20.

[0013] The multifunctional sheet-shaped absorber of the present invention comprises:
When viewed in a plan view, an absorption region phase (A phase) in which the SAP particles 20 exist at a predetermined density and a diffusion / acquisition region phase (B phase) in which the SAP particles 20 are substantially absent are formed. That is, the existence region phase and the non-existence region phase of the SAP particles 20 are clearly separated, and the respective regions are effectively played different functions and roles, thereby sufficiently exhibiting the function as an absorber. This is the concept of the present invention.

<Distribution state of A region and B region> FIG. 2 shows an absorption region phase (A phase) and a diffusion / acquisition region phase (B phase).
Phase) is shown in a plan view. First, FIG. 2A shows an example in which the absorption region phase (A phase) and the diffusion / acquisition region phase (B phase) together form a continuous phase. FIG. 2B is a cross-sectional view taken along line XX. In the cross-sectional view of FIG. 2 (b), the diffusion / acquisition region phase (B phase) is fluffy, indicating that a part of the bulky fiber is exposed on the surface. is there.

In the example shown in FIG. 2A, the absorption region phase (A phase) and the diffusion / acquisition region phase (B phase) are alternately arranged linearly extending lines. However, for example, as shown in FIG. 2C, an absorption region phase (A phase) may be discontinuously present in a continuous diffusion / acquisition region phase (B phase). As shown in d), the diffusion / acquisition region phase (B phase) may be discontinuously present in the continuous absorption region phase (A phase).
When the absorption region phase (A phase) and the diffusion / acquisition region phase (B phase) are distributed in an island shape, the planar shape thereof is not limited to a rectangular shape as shown in the figure, but may be an arbitrary shape such as a circle or a triangle. You may.

Next, the components constituting the absorption region phase (A phase) and the diffusion / acquisition region phase (B phase) and their roles will be described. Table 1 below summarizes each role. That is, Table 1 shows the degree of hydrophilic performance of the constituent materials,
Comparison of liquid permeation and diffusion functions, diffusion function using channel effect of diffusion / acquisition region phase (B phase), acquisition function of temporarily storing supplied liquid, capture of SAP particles by nonwoven fabric substrate , Trapping function, and performance required as an absorber such as liquid absorption and fixing function,
The function indicates what role each component of the absorption region phase (A phase) and the diffusion / acquisition region phase (B phase) plays.

According to the present invention, the diffusion and acquisition functions of the liquid are mainly performed by making the absorption region phase (A phase) and the diffusion / acquisition region phase (B phase) coexist in one sheet. In the phase (B phase), stable absorption and fixation effects are concentrated mainly in the absorption region phase (A phase),
This makes it so sophisticated that it cannot be obtained with conventional technology,
Moreover, an ultra-thin sheet-shaped absorber has been successfully obtained.

[0018]

[Table 1] Here, the superiority of the multifunctional absorber of the present invention will be clarified in comparison with a conventional typical one. As a control for comparison, an L size absorber for a diaper for children (absorbing capacity of about 6
00cc), its thickness, weight, SAP content,
The density and the softness were compared. The results are collectively shown in FIGS.

Comparative Example 1 is a numerical value of an absorbent using 100% pulp assuming that SAP is replaced with pulp of products such as brands (Mooney Power Slim, Super Marys, Pampers) etc. which have been on sale since 1997. It is.
Comparative Example 2 is a numerical range of a typical ultra-thin product using SAP / pulp, which has been on sale since 1997. Comparative Example 3 shows the T.P. of SAP and pulp by the dry pulp method. D.
S. (Total Dry System), which is the range of sample measurement values of sample books of representative manufacturers Melfin, Inc. of Canada and Kenocross, Honshu. Comparative Example 4 is a sample measurement value of "NovaThin" from Rayonier, USA, obtained by a method of compressing a dry pulp sheet. Comparative Example 5 is data of a prototype manufactured with reference to JP-A-8-246395 (Kao, Ino Paper).

The product of the present invention has a thickness of 0.3 mm.
In the case of, SAP of reverse phase suspension polymerization with relatively high specific gravity is used
The numerical value when there was was shown. The first feature of the product of the present invention is S
The content of AP is extremely high, and the weight of
At least 50%, under preferred conditions from 60% to 90%
%. Thus, the multifunctional sheet-shaped absorption of the present invention
The body consists of its constituents SAP, a nonwoven substrate, and
By optimizing the binding component, 50 g / cm
^TwoThe thickness when measured under a load of 1 to 1.5 mm or less
Is easily obtained, so that the apparent density is
0.1 g / cm ^Three~ 0.6g / cm^ThreeCan be changed to the extent
Yes, 0.15g / cm under normal conditions^Three~ 0.5g
/ Cm^ThreeA range of products is common.

<Components of Multifunctional Sheet Absorber> The components of the multifunctional sheet absorber of the present invention having such performance will be described in detail. (1) SAP As the SAP used in the present invention, those developed and sold as a so-called superabsorbent resin can be used. For example,
From the components, there are various types such as synthetic products, natural products and biodegradable ones, and also various shapes such as powder, spherical and granulated products, flakes and fibrous shapes. Advantageous to the present invention are acrylic acid SAPs having a large bulk density, and in particular, granular and relatively small particle size SAPs obtained by reversed phase suspension polymerization.
AP. Ordinary flakes or granulated SAP
, The bulk density is around 0.6, but the granular SAP is close to spherical and close-packed, and the particle size is 300 μm.
Below this, the bulk density becomes close to 1.1. In the present invention, in the current absorber manufacturing process, a 50 μm to 150 μm ultrafine SAP which is disliked due to generation of dust and the like can be advantageously used as a raw material. 0.6g / c apparent density
It is also possible to obtain an ultra-thin multifunctional sheet-shaped absorber such as m ³ . (2) Nonwoven fabric substrate supporting SAP The nonwoven fabric substrate used in the present invention has an excellent diffusion effect and also needs a function of stably capturing and trapping SAP in its web structure. Therefore, a single-layer so-called nonwoven fabric is not sufficient. For example, a two-layer structure of a P layer and a Q layer or a three-layer structure of a P, Q, and P / Q transition layer as shown in FIG. Non-woven fabric, or Fig. 8
A nonwoven fabric having a multilayer structure such as Q / P / Q 'shown in (b) is desirable.

The basic concept of the multilayer structure is that the P layer and the Q layer
These layers are integrated by laminating layers, and a P / Q transition layer is also included depending on the manufacturing method.

The role of each layer as a base material of the absorber is summarized as shown in Table 2 below.

[0024]

[Table 2] The dense P layer used as the diffusion layer has an apparent density of 0.0
7 g / cm ³ or more, more preferably 0.1 g / cm ³ or more.
a ^{g / cm 3 ~0.2g / cm 3} , the bulky Q layer preferably apparent density 0.07 g / cm ³ or less, and more preferably 0.05 g / cm ³ or less. It is desirable that the Q layer occupies more than half of the composition ratio of P and Q, thereby maintaining the trapping performance of the SAP.
Therefore, the apparent density as a multilayer substrate is 0.06 g / cm ^3.
It is desirable to make the following.

The diffusion layer and the P layer serving as a physical support are required to have strength and have an instantaneous diffusion effect utilizing capillary action. Therefore, as a fiber constituting the P layer, a hydrophilic fine stitch or a surface hydrophilized fiber having a relatively fine fineness of 1d to 3d is used. For example, rayon, lyocell,
Cellulose fibers such as cotton, or these and P
It is a mixture with P fiber and PET fiber. PP fiber, PE
When a synthetic fiber such as a T fiber is mainly used, it is necessary to perform a hydrophilic treatment with a surfactant or the like. This layer must have a structure that is stably bonded by means such as a heat fusible fiber, an emulsion binder, or hydroentanglement by a high-pressure water jet. At the same time as the wetting phenomenon, it has the effect of rapidly diffusing the liquid in the radial direction by capillary action.

As an SAP capture and trapping function,
Q that works as a temporary storage (acquisition) function
The layer needs a bulky structure without sagging and high resilience (compression recovery rate). For this reason, the fibers constituting the Q layer are hydrophobic fibers having a relatively large fineness of 3d to 10d. Can be For example, synthetic fibers such as PP fiber and PET fiber are used, and a more preferable structure can be obtained by mixing and using a bulky hollow bicomponent fiber used for futon cotton. In general, a hydrophobic synthetic fiber is used for the Q layer, but a hydrophilizing treatment of the surface may be rather desirable in some cases. However, a state of strong hydrophobicity such as water repellency is not preferable considering the necessity of absorbing the liquid.

In the bulky fiber gap of the Q layer, SAP particles are physically and stably trapped in the fiber gap in the region where SAP is present, and when dried, the SAP is mutually bound to the SAP by a binder described later. And fibers are strongly bonded mainly by hydrogen bonding, and handling as a sheet is easy. However, when wet after absorbing liquid, hydrogen bonding is broken by liquid absorption, SAP is released from chemical restraint, and fiber gap is released. Freely absorbs and swells in However, swelled SAP particles are less likely to fall off the sheet due to the trapping effect of the nonwoven fibers.

On the other hand, in the diffusion / acquisition region phase (B phase) in which SAP does not exist, the Q layer has a temporary liquid storage (acquisition) effect, and a large amount of liquid is temporarily stored in a bulky structure without settling. It is stored and diffused and supplied to the SAP existing area through the P layer. (3) Binding components that bind to each other and to the SAP and the base material In order to fully exhibit the absorption capacity of the SAP without hindering osmotic absorption of the solution and without causing blocking, selection of the binding component is extremely important. It is. When using a fusion fiber, a hot melt or a synthetic binder as a binder of the SAP and binding the SAP, the liquid permeability is also poor,
In addition, the SAP is restricted and cannot exhibit sufficient absorption and swelling power. The present inventors first disclosed in Japanese Patent Laid-Open No. 10-16 / 1998.
As proposed in Japanese Patent Publication No. 8230, coating and bonding SAP with microfibril-like fine cellulose fibers enables bonding by strong hydrogen bonding, whereby there is no dust during drying, and cutting and cutting can be performed. Folding, winding, etc. are easy to handle, and at the time of liquid absorption, microfibrillar fine fibers introduce and distribute water in the form of a conduit, dissociate hydrogen bonds, and cause SAP particles to freely absorb and swell. I found that. In the present invention, it is extremely useful to use such microfibrillar fine fibers as a binder.

In the present invention, the micro network structure for binding the SAP particles to predetermined positions is constituted by so-called microfibrillar fine fibers. this is,
During the production of the sheet-like superabsorbent composite of the present invention, a binder for preventing agglomeration of the SAP particles, stabilizing and homogenizing the dispersion state, and binding the SAPs after drying and the SAP and the sheet-like support after drying. Plays a role.

The microfibrillated fine fibers are generally very thin fibrous materials having an average diameter of 2.0 μm to 0.01 μm, and an average of 0.1 μm or less.
When SAP absorbs water, it has water resistance that can prevent the structure from collapsing immediately due to its swelling,
In addition, it has such properties as not to impair water permeability and SAP swellability. It should be noted that the microfibril-like fine fibers have an extremely strong hydration property that combines with water as solvation (bound water). When dispersed in water, it hydrates, exhibits a large viscosity, and exhibits a property of stably maintaining a dispersed state. Such hydratability is measured as the amount of hydrated water when centrifuged at 2000 G for 10 minutes in a dispersed state in water, and is preferably 20 ml / g or more.

In this specification, the term "microfibrillated fine fibers" is used as a general term for fibrous materials having strong hydration properties, and in some cases, those having an average diameter exceeding 2.0 μm are also used. Is possible, and
It may be a mixture of so-called fibrils and microfibrils.

The components constituting the fibrils are generally of the cellulose type, but may be fibrillated products such as polyethylene, polypropylene, ethylene vinyl acetate polymer and the like.
o-Fibril may be used. These fibrils can be prepared, for example, by the method disclosed in JP-B-49-1245.

The cellulose-based microfibrillated fine fibers preferred in the present invention can be obtained by subjecting cellulose or a cellulose derivative to microfibrillation. For example, it is obtained by grinding and highly beating wood pulp. This microfibril is called MFC (microfibrillated cellulose), and the one with more advanced microfibrillation is called super microfibrillated cellulose (S-MFC).

Further, it can also be obtained by grinding and highly beaten artificial cellulose fibers (polynosic fiber, Bemberg fiber, solvent-spun lyocell) cut into short staples.

Alternatively, the microfibrillated fine fibers are
It can also be obtained by metabolism of microorganisms. Generally, it is obtained by culturing so-called acetic acid bacteria, such as Acetobactor Xylinum, with stirring in a medium containing an appropriate carbon source to generate crude microfibrils, and then purifying. The microfibrillated fine fibers are called bacterial cellulose (BC).

A so-called fibril-like material obtained by coagulating a spin-forming cellulose ammonia solution, amine oxide solution, cellulose xanthate aqueous solution, or diacetyl cellulose acetone solution having spinning properties under shear stress is further disintegrated. The microfibrillar material obtained by the above method can also be used in the present invention.

The details of these microfibril-like fine fibers are described in JP-B-48-6641, JP-B-Sho-5-sho.
No. 0-38720 and the like, and the trade name "Cercream" (manufactured by Asahi Kasei Corporation), trade name "Serish"
(Manufactured by Daicel Chemical Industries, Ltd.) and the like.

Particularly suitable for the present invention are MFC, S-
MFC and BC. The detailed technology of S-MFC is described in JP-A-8-284090, and the BC is described in JP-B-5-80484.

MFC and S-MFC are collectively referred to as MFCs, and how to use them will be described in more detail. MFC
Some of these are commercially available after being concentrated to a solid content of about 30%. However, such a concentrated state requires a procedure of dilution and dissociation, which is troublesome and also increases the cost of concentration. In the present invention, those having a solid content of 10% or less having a higher water content are more desirable. However, 2
%, The water content becomes too large. For example, when a mixed solvent system of an organic solvent / water is used as a dispersion medium of SAP, the MFC in the medium is considered.
The selection range of the content concentration becomes narrow. When such a diluted MFC is used, the microfibrillation treatment of the raw pulp is performed not by water alone but by an organic solvent / water system containing an organic solvent used as a dispersion medium in advance. The fibrillation process is performed. Thus, the MF obtained at a dilution state of about 2%
C dispersions can also be used in the present invention.

The case where the BC is used will be described in more detail. BC is obtained as a metabolic product of a microorganism, and the concentration and form of the obtained BC vary depending on the culturing method and the harvesting method. In order to make it more uniform, the harvested and refined BC is added with a disintegration process using a mixer or a Defiprader in a diluted state of 2% or less to further subdivide the aggregated fine fiber mass.
When the homogenization is performed, the viscosity is greatly increased, and the binder effect on SAP is also increased. Therefore, it is more suitable to use the BC that has been subjected to such defibration treatment.

In a mixed system of microfibril-like ultrafine fibers represented by MFC and a superabsorbent resin, first, a mixed solution of water and an organic solvent is prepared, and the MFC is dispersed therein to form a mixture of 0.2% or more.
Make a 1.0% MFC dispersion. Generally, a procedure of dispersing a superabsorbent resin in the MFC dispersion liquid to form a slurry is adopted. As the organic solvent used,
An organic solvent that is soluble in water, does not cause the superabsorbent resin to aggregate, and suppresses swelling is selected. As a typical composition, a combination of propylene glycol / water = 70/30 or ethanol / water = 60/40 is selected. The concentration of the superabsorbent resin is preferably 10% to 50%.

<Existing state of SAP in absorption region phase (A phase)> As described above, S in the absorption region phase (A phase)
Since most of the AP exists in the Q layer of the nonwoven fabric base material, when viewed in a plan view, the SAP called the absorption region phase (A phase) is formed.
Is divided into an SAP non-existing region called a diffusion / acquisition region phase (B phase), and when viewed in cross section, it is divided into an SAP existing layer and an SAP non-existing layer. Therefore, the absorption region phase (A phase) and the diffusion / acquisition region phase (B phase) are classified with respect to the Q layer, which is the layer in which the SAP exists, and the SAP does not exist in the P layer, which is the diffusion layer. Therefore, it is difficult to distinguish between the absorption region phase (A phase) and the diffusion / acquisition region phase (B phase). Therefore, the existence state of each SAP in the existing layer (surface) of the SAP is also a major feature of the present invention.

From the macroscopic viewpoint, the SAP existence area is exactly S
Although a continuous phase is formed as if coated with AP particles, more microscopic observation shows that most independent individual particles are connected in close proximity via a binder. ing.

In the absorbent obtained from the ordinary pulp / SAP mixed system, such a connected state of individual SAPs is not observed, and a group of many SAPs is present in the pulp layer separately. It is in the state of doing. The state of existence of such pulp / SAP is described in detail in US Pat. No. 5,147,343 (Kellenberger). This is prone to SAP blocking, which is due to the SAP in the pulp / SAP ratio.
This is also the reason that the limit of the content is about 50% or less.

In the present invention, the SAP particles are partially or entirely covered with microfibrillar fine fibers, and exist in a state of being uniformly bonded to each other. The density of the individual particles varies depending on the amount and particle size of the SAP, but is at least 100 particles / cm ² or more, and in many cases, 1000 particles / cm ² or more, for example, 100 to 300 particles / cm ^{2 in a} granulated product. cm ² , 200-1 for flaked products
000 pieces / cm ² , 500 to 2500 pieces / c for single grain product
m ² has been observed.

FIGS. 9 (a), 9 (b) and 9 (c) schematically show the existing state.

<Absorptive Performance of Multifunctional Sheet-shaped Absorber> In the sheet-shaped absorber of the present invention in a state where bulky SAP is supported in the fiber gap, and individual SAP particles are coated and bonded with microfibrillar fine fibers. Is the used S
One of the major features of the present invention is that the performance of the AP is reflected without any deterioration. When a SAP having a large surface crosslink density and a high AUL value of 20 g / g or more is used, the AUL value is expressed in sheet performance with an efficiency of 90% or more. Also uncrosslinked, AUL
Even when SAP having a value of 10 g / g or less is used, the AUL value tends to increase to 100% or more due to sheeting. This tendency is presumed to be due to the structure in which each SAP particle is covered with microfibrils and compartmentalized.

In general, the absorption performance of the absorber is determined by the absorption capacity,
Although it is also expressed by a retention rate or the like, here, the above-described AUL
Let's express it by value. In the present invention, the sheet-shaped absorber is
Absorb 0.9% saline under a load of g / cm ² ,
The absorption performance after a lapse of 0 minutes is indicated by an AUL value.

When the sheet-like absorber of the present invention is finished to a thickness of about 0.5 mm and is used for a diaper, the absorption performance of the absorption region phase (A phase) should be 15 g / g or more. Is required, and AUL is preferably 20 g
/ G or more can be obtained under predetermined conditions. The entire absorber including the diffusion / acquisition region phase (B phase) preferably has an AUL value of 15 g / g or more.

<Application of Multifunctional Sheet-shaped Absorber to Absorbent Product> Consisting of an absorption region phase with SAP (A phase) and a diffusion / acquisition region phase without SAP (B phase).
Hereinafter, an application example of the multifunctional sheet-shaped absorber having the A and B multiphase structures to an absorber product will be described.

FIG. 10 shows a sheet-shaped absorber composed of an A-phase and a B-phase, in which the relatively wide B-phase is disposed at the center and the A-phase is disposed on the side, and the B-phase is used as an acquisition layer of the absorber. This is an example of forming an absorbent portion of an absorbent product used as a product.

FIG. 10A shows an example in which a sheet-shaped absorber is used in a plane, and FIG. 10B shows an example in which a side portion having an absorbing function is bent to form a C-shape to form an absorber portion. . Although such a structure requires relatively little absorption capacity, it is a preferable absorber structure for napkin-type mild incontinence products and the like that require more compactness.

FIG. 11 shows an example in which a sheet-shaped absorber composed of the A-phase and the B-phase is combined with a nonwoven fabric-shaped acquisition layer on the sheet-shaped absorber to be applied as an absorber portion of an absorbent product. I have. The structure shown in FIG. 11 (3) is an absorber having a structure in which the A-phase surface where the SAP exists is directed toward the top sheet, and an acquisition layer is stacked so as to cover the surface.

FIG. 11 (3-a) is an example in which the sheet-shaped absorber is used as it is in a planar shape, and FIG. 11 (3-b) is an example in which the acquisition layer is overlapped with the C-shaped side portion bent. is there. FIG. 11 (3-c) shows a structure in which an acquisition layer is overlaid on the central portion of a planar sheet-shaped absorber, and the side portion is bent to wrap the acquisition layer in a C-shaped structure. FIG. 11 (4) shows an absorber structure in which the SAP-existing layer faces the backsheet side and the acquisition layer is superposed on the SAP non-existing layer side.

FIG. 12 shows an example in which the absorbent portion of the absorbent product is formed by combining two layers or multiple phases of the sheet-like absorbent composed of the A phase and the B phase. The structure of FIG.
In an example in which two layers are superposed with the AP existing layer facing the top sheet side, the upper layer is narrow and the lower layer is wide. FIG. 12 (6)
Is an example in which the SAP existing layer is combined facing the upper and lower layers. The structure of FIG. 12 (7) is an example in which two layers are combined with the SAP existing layer facing the backsheet side, and in this example, the lower layer is narrow.

FIG. 13 shows an example in which an absorbent part of an absorbent product is formed by combining a sheet-like absorbent composed of A phase and B phase and a sheet-like absorbent entirely covered with SAP. It is. FIG. 13 (8) shows the sheet absorber as its SA.
This is an example in which the P-existing surface is arranged on the top sheet side, and the lower surface thereof is combined with an absorbent sheet entirely covered with SAP on the lower surface. In this example, the lower layer sheet is narrow.
The structure shown in FIG. 13 (9) shows an absorbent body in which the SAP existing surface is directed to the back sheet side, and the entire SAP sheet is overlapped so as to face the back sheet side. The structure of FIG. 13 (10) is an absorber formed by laminating a full SAP sheet with the SAP existing surface facing the back sheet side and the SAP existing surface also facing the back sheet side below it in a wide state. Is shown.

FIG. 14 shows an example in which, in a sheet-like absorber composed of A-phase and B-phase, the B-phase portion is three-dimensionally raised, and the raised portion is joined to the top sheet to form the absorber portion. It is a thing. As shown in FIG. 14 (a), first, a sheet-like absorber having the SAP existing layer facing the back sheet side is prepared. Then, as shown in FIG.
The phase portion is raised using projections, grooves and the like. When the top sheet is joined to the raised portion, an absorber integrated with the top sheet as shown in FIG. 14 (c) is obtained. The absorber having such a structure has a mechanism to stably absorb the liquid from the junction between the top sheet and the B phase and to diffuse and absorb the absorbed liquid into the A phase. This is one example in which a corresponding space is prepared three-dimensionally and a sheet-like absorber having a structure like the present invention is effectively used. Evaluation method Weight (g / m ² ) The weight of a 10 cm × 10 cm sheet is weighed with an electronic balance and converted to the weight (g) per 1 m ² . 2. Thickness (mm) The thickness was measured using a thickness measuring device manufactured by Daiei Kagaku Seiki Seisakusho under the following conditions.

[0058] 3. Apparent density of absorber (g / cm ³ ) It was calculated from the basis weight (g / m ² ) and thickness (mm) of the sheet-shaped absorber by the following formula.

Apparent density (g / cm ³ ) = (weight (g / cm ³ )
m ² ) / 10 ⁴ ) × (10 / thickness (mm)) Bending resistance (cantilever method) (cm) A sample is cut into 2 cm (width) x 15 cm (length) and humidified in a standard condition of 20 ° C x 65% RH for 24 hours or more.

The bending resistance is measured by using a cantilever softness tester manufactured by Daiei Kagaku Seiki Seisaku-Sho, Ltd. to measure the length (cm) until the sample end comes into contact with the inclined surface. 5. Instant diffusion (cm ² ) 0.9% NaCl aqueous solution is put into the burette.

[0061] The tip of the burette is 20cm x 20cm.
5cm height at the center of the sample sheet
5 ml of liquid is dropped into the center of the sheet in a short time (within 2 to 3 seconds), and the liquid is immediately diffused.
Is read, and the area (cm ² ) is obtained by approximating an ellipse. 6. AUL (Amount of liquid absorbed under pressure) (g / g) AUL was measured using the apparatus shown in FIG.

The configuration and the measuring method of this device are as follows. An artificial urine is put into a container having an opening for connecting a top and a conduit through a top opening, an outside air suction pipe is inserted through a rubber stopper, and placed on an electronic balance. .

The conduit connection opening and the funnel type glass filter are connected and fixed by a silicon tube, and the glass filter surface and the lower end of the outside air suction pipe are horizontally aligned.

A filter paper is placed on a glass filter surface, and a sample (W _O ) such as a sheet-like absorber or SAP is placed thereon, and the sample is absorbed after 30 minutes under a weight load of 20 g / cm ^2. The liquid volume (W) was determined. Similarly, the liquid absorption amount (W _F ) of only the filter paper excluding the sample was determined, and AUL (g)
/ G) was calculated. AUL (g / g) = (W−W _F ) / (W _O ) The composition of the artificial urine used in the present invention was as follows.

[0065] The composition of the artificial urine (wt%) Urea 2 Sodium chloride (NaCl) 0.8 Magnesium sulfate _{(Mg 2 SO 4 · 7H 2} O) 0.08 Calcium chloride (CaCl ₂ · 2H ₂ O) 0.03 ions Exchange water 97.09 7. Retention of swollen SAP when moistened A sample of a 2 cm × 10 cm strip cut from a sheet-shaped absorber is used.

Standing and Holding Property Two strip-shaped samples were placed in a 12 cmφ petri dish, and the SA
Arrange at approximately 2 cm intervals with P-existing surface up, 0.9%
The SAP is swelled by gently adding 50 ml of NaCl (physiological saline) and allowed to stand for 10 minutes, and the state in which the SAP is detached from the sample into the liquid as it swells is visually determined.

(Evaluation Criteria): Even when the SAP swelled, almost no peel-off was observed.

○: Slight drop-off was observed with SAP swelling.

Δ: Dropout was clearly observed with SAP swelling.

×: The SAP was largely dropped off with swelling of the SAP, and was deposited in the liquid.

In the above-mentioned test of standing retention, the sample was subjected to
The same procedure was followed, except that the sample was placed in a petri dish with the AP face down, and the criteria were the same.

Vertically suspended holding property The sample after the above-mentioned standing holding property evaluation was immediately taken out of the liquid with tweezers, and one end in the length direction was gripped with a clip and suspended vertically to form a sheet of swollen SAP. The state of detachment from the support is visually determined.

(Evaluation Criteria) ◎: Swelling SAP was hardly peeled off.

：: The surface layer portion of the swollen SAP slightly dropped off.

Δ: Of the swollen SAP, the one in the surface layer was partially dropped, but was retained in the portion directly in contact with the sheet-like support.

X: The swollen SAP was largely separated from the sheet-like support and dropped off. 8. Cellophane tape peeling sample (10cm × 10cm) at 20 ℃, 65% RH
After humidifying for 24 hours or more under the standard condition of, place it on a desk or plastic plate having a uniform flat state. A 15-mm-wide Nichiban “Cellotape (trademark)” was adhered on the SAP-existing surface of the sample by rubbing twice with an eraser having a width of 20 mm or more while holding one end in a width of 15 mm and a length of 20 mm. Then, make one end of the cellophane tape horizontal (180 °) and peel it off. The state of the SAP adhered to the cellophane tape peeled off from the sample is observed and evaluated according to the criterion in FIG.

[0077]

Examples of the present invention will be described below.

Example 1 1) Substrate Used A bulky laminated nonwoven fabric manufactured by Daiwa Spinning Co., Ltd. was used as the substrate used. The composition is fine denier rayon 1.25d
High-density layer P of × 44 mm and thick denier PET6
The low-density bulky layer Q consisting of d × 51 mm is P and Q
Entangled in the transition layer.

This nonwoven fabric is obtained by laminating a card web of the above rayon of 15 g / m ² and a card web of the above PET of 20 g / m ² , and using a nozzle provided with orifices of 0.12 mmφ at 0.6 mm intervals. 40kg / c
The columnar water stream of m ² was jetted once from the rayon surface and the PET surface, respectively, and was obtained by entanglement. Further, using a nozzle provided with orifices of 0.15 mmφ at intervals of 5 mm, PET is used.
A columnar water flow of 70 kg / cm ² was injected from the side to obtain a laminated spunlaced nonwoven fabric having a linear entangled portion. The rayon layer is tightly entangled due to the difference in rigidity and hydrophilicity due to the thickness and Young's modulus of the fiber, but the PET layer is only partially entangled with the rayon layer at the boundary and has a fibrous structure that is mainly looped. A bulky layer with a large amount is formed.

In the portion where the water entanglement treatment is performed in a line shape by using nozzles at intervals of 5 mm, the rayon layer is further entangled and the PET layer and the rayon layer are entangled in a line shape to prevent separation between layers.

The characteristics of this nonwoven fabric are as follows:
It can be seen that the characteristics of the P and Q layers are different.

When the instantaneous diffusivity is observed by separating the P layer and the Q layer, the P layer diffuses immediately after the liquid is supplied, and the Q layer becomes a bead and does not diffuse as it is. Even when the solution was liquid, it diffused through the interface between the P layer and the P and Q layers.

Total weight 35 g / m ² (P layer 15 g
/ M ² , Q layer 20 g / m ² ) Total thickness 1.2 mm (P layer 0.2 mm, Q layer 1.
0 mm) Overall apparent density 0.03 g / cm ² (P layer 0.
08 g / cm ² , Q layer 0.02 g / cm ³ ) Tensile strength Vertical 0.60 kgf / 5 cm, horizontal 0.11 kgf / 5 cm Tensile elongation Vertical 26%, horizontal 165% Instantaneous diffusivity P layer surface 75cm ² , Q layer surface 30
cm ² 2) Preparation of MFC dispersion liquid SFC having a mother liquor concentration of 4.5% manufactured by Tokushu Paper Co., Ltd. was used as MFC.
Using an aqueous MFC dispersion, isopropanol (IPA) / water (weight ratio 70/30) as a dispersion medium for the slurry
A mixed solution of the system was used. First, the S-MFC mother liquor was dispersed and diluted with a predetermined amount of water so that the MFC concentration became 0.67%, and then a predetermined amount of IPA was added to prepare an S-MFC dispersion.

3) Preparation of SAP / MFC Slurry The SAP in the MFC dispersion has a bead-like bulk density of 0.9-1.1 (g / ml) and a particle diameter of 50-150 μm.
Aquapearl AP-211D of Mitsubishi Chemical Co., Ltd.
S was added while continuing stirring so that the weight ratio became 25% to obtain a slurry.

The resulting slurry had an S-MFC concentration of 0.5%, and the ratio of S-MFC to SAP was 2%.
%.

This slurry maintains a sufficiently stable state during coating and has both viscosity and fluidity suitable for coating.

IPA is mixed with water at an arbitrary ratio, and if it is an uncrosslinked SAP having a dielectric constant of 18.3, it will strongly coagulate. However, almost any SAP which has been subjected to surface treatment such as surface crosslinking is used. A stable dispersion state can be maintained without aggregation and in the presence of S-MFC.

Considering the mixing ratio of IPA / water,
An IPA ratio of 50/50 or more by weight inhibits SAP swelling, has relatively low toxicity in handling, and has a boiling point of 82 ° C. lower than that of water, which is advantageous for recovery.

4) Sheet Forming The base material was coated with a SAP / S-MFC slurry in a continuous line using a trough-type coating apparatus having a partition plate as shown in FIG.

The shape of the line is as follows.
The A region in the AP existing portion has a width of 10 mm, and the B region composed of only the non-coated nonwoven fabric portion in the uncoated portion has a width of 5 mm and an A / B ratio of 2/1.

The coating amount of the slurry was 300 g / m ² in the region A in terms of the amount of SAP attached, the SAP was not attached in the non-coated portion, and the average value of the entire coated surface was 200 g / m ²
It was set by adjusting the clearance of the trough of the coating apparatus so that

Most of the dispersion medium is removed from the substrate coated with the slurry by slit-type suction. The SAP, which had been dewatered and coated with SAP, was evaporated and removed from the remaining dispersion medium with a hot roll heated at 140 ° C. in a closed drying chamber, and the SAP was fixed to the substrate by S-MFC. IPA in the dispersion medium vaporized in the drying chamber was condensed and recovered.

5) Characteristics of the obtained sheet molded product The average weight per unit area of the coated and dried sheet-shaped absorbent was 235 g / m ² , and the weight of the SAP was 200 g / m 2 on average. ^2, and its properties were as shown in Table 3. This fine particle SAP having a bulk density of 1.0 g / ml
Is thin as 0.8 mm. Incidentally, the one coated with the usual SAP having a bulk density of 0.6 g / ml has a thickness of 1.1 mm.

It was confirmed that the AUL value as the absorber was at a good level without impairing the performance of the raw material SAP.
As for the instantaneous diffusivity, the difference between the P plane and the Q plane is observed in the raw material, but the difference in the diffusion state between the P and Q layer surfaces is hardly observed by coating.

Further, at the time of drying, the SAP is hardly peeled off or dropped off from the base material due to the effect of hydrogen bonding of the S-MFC. At the time of wetting, the hydrogen bonding effect of the S-MFC is lost, but the swollen SAP is captured by the lapping effect of the Q layer having many voids by using the bulky laminated nonwoven fabric, and it is confirmed that the effect is large.

[0096]

[Table 3] (Example 2) 1) Use base material The bulky laminated nonwoven fabric used in Example 1 was used.

2) Preparation of MFC Dispersion In a dispersion medium using a solvent having a low dielectric constant, the SAP uncrosslinked on the surface is liable to cause a phenomenon in which the SAPs agglomerate. For example, in an ethanol / water system, the particles aggregate in a range of 90/10 to 45/55. No aggregation phenomenon is observed in the propylene glycol (PG) / water system, but when the water ratio is increased beyond 70/30, the SAP particles swell.

Therefore, in order to obtain a stable slurry of surface-uncrosslinked SAP, the behavior of a three-component system as a PG / ethanol / water system was examined, and FIG. 18 shows a stable dispersion region.

From these results, a three-component system of PG / ethanol / water (50/30/20) was selected as the dispersion medium. MF was S-M having a mother liquor concentration of 4.5% as in Example 1.
Using an aqueous FC dispersion, a PG / ethanol / water (weight ratio of 50/30/20) system mixed solution having an MFC concentration of 0.1% was used.
First, the dispersion was diluted with predetermined water so as to be 67%, and then predetermined ethanol and PG were added to prepare an S-MFC dispersion.

3) Preparation of SAP Slurry In this example, four kinds of SAPs as shown in Table 4 were prepared in order to see the difference in the presence or absence of surface cross-linking and the influence of the particle shape. This SAP was tested by Toagosei Co., Ltd.

[0101]

[Table 4] M using the three-component dispersion medium as in Example 1
While stirring the FC-containing dispersion, predetermined amounts of the four SAPs in Table 4 were added to prepare four types of 25% slurry by weight.

At this time, the S-MFC concentration of the slurry was 0.5
%, And the ratio of S-MFC to SAP is 2%.

All of the slurries exhibited sufficient stability during coating.

4) Sheet Forming The above substrate was coated with a SAP / S-MFC slurry in a continuous line using the same trough-type coating apparatus as in Example 1 with a partition plate.

The coating amount of the slurry was set such that the average value of the entire coating was 160 g / m ² as the amount of the adhered SAP.

In the same manner as in Example 1, the majority of the dispersion medium contained in the sheet, on which the slurry containing SAP was coated on the substrate, was removed using a slit type suction.

The dispersion medium remaining on the dewatered sheet is:
After evaporating and removing with a hot roll at 200 ° C in a closed drying room, spray water is uniformly supplied with spray water at 150g / m ² to humidify the sheet, and then dried with a hot roll at 150 ° C while adding a net press.・ After heat treatment, SAP
Was fixed to the substrate.

In a solvent having a boiling point lower than that of water (eg, ethanol, IPA, etc.), the solvent evaporates earlier than in a mixed system with water, and hydrogen bonding occurs after the remaining water is dried.

However, when a solvent having a boiling point higher than that of water (PG in this embodiment) is used, water evaporates first.
G remains on the sheet and no hydrogen bonds are formed. Therefore, after the dispersion medium in the coating slurry is dried and evaporated, it is necessary to supply water there to generate hydrogen bonds. In the present embodiment, spray was used as one method of supplying water.

5) Basic Properties of the Obtained Sheets The properties of the four types of sheets which were dried and heat-treated after coating the SAP slurry were as follows.

Weight (average weight) 195 g / m ² SAP adhesion amount Average adhesion amount 160 g / m ² A phase (SAP existing portion) 240 g / m ² ... Common to four types Thickness Fine powder (UM−) 1, UM-2) Product used 0.7 mm Flake-shaped (M-1, RS-2) product used 1.0 mm These sheets are partially equivalent to 240 g / m ² of SA.
Each sheet has a thickness of 1 despite the amount of P attached.
mm or less was obtained.

In particular, those coated with fine powder SAP were finished in a thinner sheet having a thickness of 0.7 mm.

Each sheet was flexible and easy to handle.

6) AUL of obtained sheet Table 5 shows AUL as the amount of SAP held by the obtained sheet and AUL of SAP used for each sheet.

In the conventional method, the AUL value is generally decreased by forming the SAP into a sheet. However, in the method of the present invention, the SAP is formed into a sheet so that the surface crosslinked product can maintain the performance of the raw material SAP as it is. You can see that there is.

On the other hand, in the case of a surface non-crosslinked (untreated surface) product, an AUL value of 1.5 to
It was recognized that the improvement was almost doubled.

This is thought to be largely due to the existence of the MFC of the present invention and the structure of the nonwoven fabric as the substrate.

[0118]

[Table 5] *: Converted per gram of SAP in absorbent

[0119]

As described above, the present invention relates to a composite absorbent comprising a non-woven fabric base material and SAP, and a bonding agent for bonding SAP and each other, and a binder for binding SAP and non-woven fabric constituent fibers. A multi-layer nonwoven fabric having a diffusion layer made of high-density hydrophilic fibers having a permeation and diffusion effect by a capillary effect and an acquisition layer combined with a bulky and high resilience value (elastic recovery rate)
The problem is solved by combining the P particles in a predetermined region only in a stable trapping state while combining the non-woven regions having a diffusion / acquisition effect with an appropriate distribution ratio. At the same time, it is possible to obtain a multifunctional sheet-shaped absorber excellent in absorbability and fixability of the absorbed liquid.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a basic structure of a sheet-shaped absorber of the present invention in cross section.

FIGS. 2 (a), (c) and (d) show different distribution states of an absorption region phase (A phase) and a diffusion / acquisition region phase (B phase) in a multifunctional sheet-shaped absorber of the present invention. The top view shown, (b) is sectional drawing in the XX line of (a).

FIG. 3 is a graph showing a comparison of thicknesses of absorbers having the same absorption amount.

FIG. 4 is a graph showing a comparison of weights of absorbers having the same absorption amount.

FIG. 5 is a graph showing a comparison of SAP content of absorbers having the same absorption amount.

FIG. 6 is a graph showing a comparison of apparent densities of absorbers having the same absorption amount.

FIG. 7 is a graph showing a comparison of bristles of absorbers having the same absorption amount.

FIGS. 8A and 8B are cross-sectional views respectively showing the layer configurations of two types of nonwoven fabric substrates used in the present invention.

FIGS. 9A, 9B and 9C are explanatory diagrams showing distribution states of respective components in an absorption region phase (A phase) of the multifunctional sheet-shaped absorber of the present invention.

FIG. 10 is an explanatory diagram showing a procedure for forming an absorbent portion of an absorbent product using a sheet-shaped absorbent composed of an A phase and a B phase.

FIGS. 11A to 11C are explanatory diagrams showing a procedure for forming an absorbent portion of an absorbent product using a sheet-like absorbent composed of an A phase and a B phase and an acquisition layer. ,
(4) is an explanatory view showing another arrangement example in which an absorbent portion of an absorbent product is formed using a sheet-like absorbent composed of an A phase and a B phase and an acquisition layer.

FIGS. 12 (5), (9) and (7) are explanatory views showing examples of arrangement in which an absorbent portion of an absorbent product is formed by combining two sheet-shaped absorbents composed of an A phase and a B phase. .

FIGS. 13 (8), (9) and (10) show a combination of a sheet-like absorber composed of A-phase and B-phase and a sheet-like absorber entirely covered with SAP to form an absorbent part of an absorbent product. Explanatory drawing which shows the example of each different arrangement formed.

FIG. 14 is an explanatory view showing a procedure in which a B-phase part of a sheet-shaped absorber composed of an A-phase and a B-phase is three-dimensionally raised, and the raised part is joined to a top sheet to form an absorber part.

FIG. 15 is an explanatory diagram showing an AUL measuring device.

FIG. 16 is an explanatory diagram showing criteria for the cellophane tape peeling method.

FIG. 17: SAP / S-MF applied to a substrate by a coating apparatus
Explanatory drawing which shows the state which coats C slurry in a continuous line shape.

FIG. 18: Propylene glycol / ethanol / water 3
4 is a graph showing the behavior of SAP in a component system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Nonwoven fabric base material 11 High-density layer 12 Low-density layer 13 Binding component 20 SAP particle

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 19, 2000 (2004.1.
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

15. Along with the diffusion layer (P) and said acquisition layer (Q) is configured with stacked vertically, between these two components and the acquisition layer of the diffusion layer (P) (Q) The transition layer (P /
The sheet-shaped absorber according to any one of claims 1 to 14, which has Q).

16. Focusing the diffusion layer (P), said acquisition layer (Q) is provided on the upper and lower 請
The sheet-shaped absorber according to any one of claims 1 to 15 .

17. The nonwoven fabric-like substrate has an apparent density of 0.0
And at 6 g / cm ³ or less, and the apparent density of the diffusion layer (P) is 0.07 g / cm ³ or more, an apparent density of the acquisition layer (Q) is 0.07 g / cm ³ or less according
Item 17. The sheet-shaped absorber according to any one of Items 1 to 16 .

18. intensively with the water-absorbent resin presence layer formed by carrying little or no presence the super absorbent polymer is the high water-absorbent resin bulky the acquisition layer of the nonwoven fabric base material (Q) The sheet-shaped absorber according to any one of claims 1 to 17, which has a two-layer structure including a non-existing layer and a non-existing layer.

19. The binder component is any one of claims 1 to 18 is fibrillar fine fibers having a wettable 1
Item 14. The sheet-shaped absorber according to Item.

20. The method of claim 19, wherein the binder component, the fibrillar microfibers having hydrating, claim 19 is obtained by coexisting the short fibrous thermally fusible synthetic fibers below the cut length 10mm
3. The sheet-shaped absorber according to item 1.

21. The sheet-like absorber according to claim 19, wherein the fibril-like fine fibers having hydration properties are microfibril-like cellulose obtained by beating wood pulp.

22. fibrillar microfibers having a hydration resistance, wherein a bacterial cellulose of microbial origin
Item 21. The sheet-shaped absorber according to item 19 or 20 .

23. The top Sea that is in contact with the skin in use state
DOO, leakproofness backsheet with, and in absorbent product with an absorbent body interposed between both, as the absorber, the sheet-like absorbent according to any one of claims 1 to 22 An absorbent product, characterized by using:

24. coordinating the existing surface of the super absorbent polymer of the sheet-shaped absorbent body so as to be positioned on the back sheet side
Claims, and further newly provided web layer acquisition to the high water-absorbent resin existing surface facing said topsheet
Item 24. The absorbent product according to item 23 .

25. arrange existing surface of the super absorbent polymer of the sheet-shaped absorbent body to face the top sheet side,
A part of the surface on which the superabsorbent resin is present has an acquisition wafer.
24. The absorbent product according to claim 23 , wherein the absorbent product is provided with a protective layer .

26. Claim for the both side of the high water-absorbent resin existing surface facing the top sheet side is formed into C-shape by bending inward, and integrated overlapping said web layer acquisition thereon 26. The absorbent product according to 25 .

27. The acquisition web layer, through-air method, according to claim nonwovens by dry nonwoven fabric or spunbond method, by spot bonding method 24-2
7. The absorbent product according to any one of 6 .

Absorbent product according to any one of 28. Claim 24-26 wherein the acquisition web layer is unbonded web.

29. A claim having at least a portion of the layer formed by multilayer of the sheet-shaped absorbent body 2 or three layers 23-2
9. The absorbent product according to any one of items 8 to 8 .

30. The non-woven fabric base of the sheet-shaped absorber
The absorbent product of claim 23 comprising coupled only consist of B phase portion timber and said topsheet, said topsheet and said absorbent body are integrated.

31. The nonwoven fabric-like base of the sheet-shaped absorbent body
The absorbent product of claim 23 comprising coupled only consist of B phase portion timber and said backsheet, said backsheet and said absorbent body are integrated.

32. The non-woven fabric base of the sheet absorbent body
The B-phase portion consisting of wood alone, the top sheet from an upper layer, consisting, respectively coupled to the back sheet from a lower layer, said topsheet, said backsheet and said <br/> absorber is integrated claimed Item 24. The absorbent product according to item 23 .

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

That is, the multifunctional sheet-shaped absorbent of the present invention comprises an absorbent layer containing a superabsorbent resin as a main component, a nonwoven fabric substrate carrying the superabsorbent resin, and a space between the superabsorbent resins. It is a sheet-shaped absorber composed of three components of a superabsorbent resin and a binder component that binds between the nonwoven fabric base material, wherein the nonwoven fabric base material has relatively high hydrophilicity and high density.
Diffusion layer (P) consisting of high fiber layer, relatively hydrophilic
An acquisition layer (Q) consisting of a low-density fiber layer
And is composed of a nonwoven fabric having a multilayer structure composed of the on the surface of the sheet-shaped absorbent body, the absorbent layer and it consists of said nonwoven fabric substrate carrying the absorption region phase (A phase)
And a diffusion / acquisition region phase (B phase) mainly composed of only the nonwoven fabric substrate, in which the superabsorbent resin is scarcely present, are distributed so as to be distinguishable from each other.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

In the present invention, the nonwoven fabric-like substrate supporting the superabsorbent resin is different from a so-called diffusion layer (P) comprising a fiber layer having relatively high hydrophilicity and high density, and having a relatively high hydrophilicity. A so-called acquisition layer (Q) composed of a low-density fiber layer.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

The present invention also provides for skin contact in use.
An absorbent product comprising a top sheet , a back sheet having leakproofness, and an absorbent interposed therebetween, wherein the absorbent product using the multifunctional sheet-shaped absorbent is provided.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) B32B 5/14 A61F 13/18 307G 27/10 310A D04H 1/42 // A61F 5/44 (72) Invention Person Ryoichi Matsumoto 2-26-5 Nihonbashihama-cho, Chuo-ku, Tokyo F-term in Japan Absorbent Technology Research Institute Co., Ltd. (reference) AK01B AK25 BA02 BA43 CB00 DE01B DG15A GB72 JD15B 4L047 AA12 AA21 AA28 AB02 BA04 CA02 CB07 CB10 CC03 CC04 CC05

Claims (33)

[Claims] 1. An absorbent layer containing a superabsorbent resin as a main component, a nonwoven fabric substrate supporting the superabsorbent resin, and a space between the superabsorbent resins and between the superabsorbent resin and the base material. A sheet-shaped absorber comprising three components of a binder component to be bound, and an absorption region phase (A phase) comprising, on a surface of the sheet-shaped absorber, the absorption layer and a nonwoven base material carrying the absorption layer. And a diffusion / acquisition region phase (B phase) mainly consisting only of the nonwoven fabric substrate, wherein the superabsorbent resin is scarcely present, and distributed so as to be distinguishable from each other. Multifunctional sheet-shaped absorber having a structure. 2. The sheet-shaped absorber according to claim 1, wherein the absorption region phase (A phase) and the diffusion / acquisition region phase (B phase) exist as a continuous phase in contact with each other. 3. The sheet-shaped absorber according to claim 1, wherein the absorption region phase (A phase) is discontinuous in the continuous diffusion / acquisition region phase (B phase). 4. The sheet-shaped absorber according to claim 1, wherein the diffusion / acquisition region phase (B phase) is discontinuously present in the continuous absorption region phase (A phase). 5. The ratio (A) of the area (A) of the absorption region phase (A phase) to the area (B) of the diffusion / acquisition region phase (B phase).
The sheet-shaped absorber according to any one of claims 1 to 4, wherein / B) is 0.5 or more. 6. The sheet according to claim 1, wherein the plurality of superabsorbent resins present in the absorption region phase (A phase) are present at a density of at least 100 / cm ² or more. Absorber. 7. The absorption amount under pressure (AUL) when absorbing 0.9% saline under a pressure of 20 g / cm ² is at least 20 g / g or more in the absorption region phase (A phase), and the absorption region. The sheet-shaped absorber according to any one of claims 1 to 6, wherein the coexistence region phase (AB phase) in which the phase and the diffusion / acquisition region phase (B phase) are present has an absorption amount of 12 g / g or more. . 8. The sheet-shaped absorber according to claim 1, wherein the weight of the superabsorbent resin accounts for 50% or more based on the total weight of the absorber. 9. The sheet-shaped absorber according to claim 1, wherein the weight of the superabsorbent resin accounts for 60% to 90% based on the total weight of the absorber. 10. An apparent density of 0.1 g / cm ^{3 to} 0.6.
sheet-shaped absorbent body according to any one of claims 1 to 9 is g / cm ^3. 11. An apparent density of 0.15 g / cm ^{3 to} 0.1 g / cm ³ .
Sheet-shaped absorbent body according to claim 10 which is 5 g / cm ^3. 12. The sheet-shaped absorbent according to claim 1, which has a thickness of 1.5 mm or less when measured under a load of 50 g / cm ² . 13. The bulk density of the superabsorbent resin is 0.6 g / m.
The sheet-shaped absorber according to any one of claims 1 to 12, wherein the average particle diameter is 200 µm or less. 14. The bulk density of the superabsorbent resin is 0.7 g / m.
1 to 1.1 g / ml, and the average particle size is 50 μm to 1
The sheet-shaped absorber according to any one of claims 1 to 12, which has a thickness of 50 µm. 15. The nonwoven fabric-like substrate carrying a superabsorbent resin is a diffusion layer (P) comprising a fiber layer having relatively high hydrophilicity and high density, and a diffusion layer (P) having relatively low hydrophilicity and low density. The sheet-shaped absorber according to any one of claims 1 to 14, comprising an acquisition layer (Q) formed of a fiber layer. 16. A structure in which the diffusion layer (P) and the acquisition layer (Q) are vertically stacked, and a component of the diffusion layer (P) and the acquisition layer (Q) are interposed between the diffusion layer (P) and the acquisition layer (Q). The transition layer (P /
The sheet-shaped absorber according to claim 15, which has Q). 17. The sheet-shaped absorber according to claim 15, wherein an acquisition layer (Q) is provided above and below the diffusion layer (P). 18. The non-woven base fabric having an apparent density of 0.0
6 g / cm ³ or less, and the apparent density of the diffusion layer (P) is 0.07 g / cm ³ or more, claim apparent density of 0.07 g / cm ³ or less of the acquisition layer (Q) 18. The sheet-shaped absorber according to 15 to 17. 19. A water-absorbent resin-existing layer in which a highly water-absorbent resin is intensively supported on the bulky acquisition layer (Q) of the nonwoven fabric-based substrate, and a non-water-absorbent resin having little or no superabsorbent resin. 19. The sheet-shaped absorber according to claim 15, which has a two-layer structure including an existing layer. 20. The method according to claim 1, wherein the binder component is a fibril-like fine fiber having hydratability.
Item 14. The sheet-shaped absorber according to Item. 21. The binder component according to claim 20, wherein the fibril-like fine fibers having hydration properties are made of short fibrous heat-fusible synthetic fibers having a cut length of 10 mm or less.
3. The sheet-shaped absorber according to item 1. 22. The sheet-like absorber according to claim 20, wherein the fibril-like fine fibers having hydration properties are microfibril-like cellulose obtained by beating wood pulp. 23. The sheet-shaped absorbent according to claim 20, wherein the fibril-like fine fibers having hydration properties are bacterial cellulose of microbial origin. 24. An absorbent product comprising a surface sheet that comes into contact with the skin in a use state, a back sheet having leakproofness, and an absorber interposed therebetween. 23. An absorbent product using the sheet-shaped absorbent according to any one of 23. 25. The sheet-shaped absorbent body is arranged so that the surface on which the superabsorbent resin is present is located on the backsheet side, and the surface for superfluous resin that does not exist on the topsheet is newly obtained for acquisition. The absorbent product according to claim 24, wherein a web layer is provided. 26. The sheet-shaped absorber in which the surface on which the superabsorbent resin is present is oriented so as to face the top sheet, and a web layer for acquisition is provided on a part of the surface on which the superabsorbent resin is present. Item 25. The absorbent product according to item 24. 27. The method according to claim 26, wherein both ends of the surface on which the superabsorbent resin is present facing the top sheet side are bent inward to form a C-shape, and an acquisition web layer is laminated thereon and integrated. Absorbent products. 28. The acquisition web layer comprises:
Dry nonwoven fabric by through air method, spot bond method,
Or a nonwoven fabric by a spun-pound method.
28. The absorbent product according to any one of 27. 29. The absorbent product according to claim 24, wherein the acquisition web is an unbonded web. 30. At least a part of the sheet-shaped absorber having two or three layers.
10. The absorbent product according to any one of items 9 to 9. 31. A sheet-like absorbent body comprising a B-phase portion made of only a nonwoven fabric substrate and a top sheet,
The absorbent product according to claim 24, wherein the topsheet and the absorbent are integrated. 32. The sheet-like absorbent body comprising a B-phase portion made of only a nonwoven fabric substrate and a backsheet,
The absorbent product according to claim 24, wherein the backsheet and the absorbent material are integrated. 33. A top sheet, a back sheet and an absorbent body, wherein the top sheet, the back sheet from the upper layer and the back sheet from the lower layer are respectively bonded to the B-phase part of the sheet-shaped absorbent body consisting only of the nonwoven fabric substrate. The absorbent article according to claim 24, wherein the absorbent article is formed.