CN216876825U

CN216876825U - Absorbent body and absorbent article

Info

Publication number: CN216876825U
Application number: CN202090000820.XU
Authority: CN
Inventors: 梶原顺; 川口宏子
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2019-08-26
Filing date: 2020-08-19
Publication date: 2022-07-05
Anticipated expiration: 2030-08-19
Also published as: JP2021029685A; WO2021039543A1

Abstract

The absorbent (1) of the present invention comprises a water-absorbent polymer (3), an antimicrobial agent (8), and cellulose fibers (5), wherein the water-absorbent polymer (3) and the antimicrobial agent (8) are bonded to the cellulose fibers (5) via a binder (7). The antibacterial agent (8) is preferably attached to the surface of the adhesive (7). It is preferable that the antibacterial agent (8) is more adhered to the surface of the adhesive (7) than the antibacterial agent (8) buried inside the adhesive (7). The absorbent article of the present invention has a front sheet and a back sheet with the absorbent body (1) therebetween.

Description

Absorbent body and absorbent article

Technical Field

The present invention relates to an absorbent body and an absorbent article.

Background

As an absorbent body included in an absorbent article such as a diaper, an absorbent body containing an antibacterial agent is known from the viewpoint of suppressing the proliferation of bacteria contained in body fluids such as urine, feces, sweat, and menstrual blood from the skin of a wearer. For example, patent document 1 describes mixing an absorbent material, to which a predetermined amount of an antimicrobial agent is added, into a binder for binding pulp and a super absorbent polymer.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2005-198701

Disclosure of Invention

The present invention relates to an absorbent material containing a water-absorbent polymer, an antimicrobial agent and cellulose fibers.

The water-absorbent polymer and the antibacterial agent are preferably bonded to the cellulose fibers via an adhesive.

Further, the present invention relates to an absorbent article having a front sheet and a back sheet with the absorbent body disposed therebetween.

Drawings

Fig. 1 is a view showing an embodiment of the absorbent body of the present invention, and is a cross-sectional view schematically showing a cross-section of the absorbent body.

FIG. 2 is an enlarged schematic view showing the state of adhesion of the water-absorbent polymer, the antimicrobial agent and the cellulose fibers shown in FIG. 1.

Fig. 3 is a cross-sectional view schematically showing a cross section of another embodiment of the absorbent body of the present invention.

Fig. 4 is a sectional view schematically showing a section of another embodiment of the absorbent body of the present invention.

Fig. 5 is a sectional view schematically showing a section of an absorbent core in another embodiment of the absorbent body of the present invention.

FIG. 6 is an enlarged schematic view of the complex shown in FIG. 5.

Fig. 7 is an enlarged schematic view of a composite body in another embodiment of the absorbent body of the present invention.

Detailed Description

There are cases where a so-called liquid return occurs in which the body fluid absorbed into the absorber flows back toward the skin of the wearer. In the absorbent body containing the antibacterial agent, the antibacterial agent is transferred to the absorbed body fluid, and therefore the body fluid containing the antibacterial agent adheres to the skin of the wearer due to the rewet. Although body fluids containing antimicrobial agents may cause stickiness, if the content of the antimicrobial agent in the absorbent body is reduced to prevent this, the antimicrobial properties of the absorbent body are reduced. The absorbent body described in patent document 1 cannot achieve both suppression of stickiness due to a returned body fluid and antibacterial properties of the absorbent body.

The present invention relates to absorption in which both the antibacterial property of an absorbent body and the inhibition of stickiness due to a returned body fluid are satisfied, and an absorbent article including the absorbent body.

The present invention will be described below based on preferred embodiments thereof with reference to the accompanying drawings. Fig. 1 and 2 show an absorbent body 1 according to an embodiment of the present invention. As shown in fig. 1, the absorbent body 1a of the present embodiment includes an absorbent core 4 and a core-wrapped sheet 6 wrapping an outer surface of the absorbent core 4. In the present embodiment, the absorbent core 4 is a mixed fiber product of the water-absorbent polymer 3, the antimicrobial agent 8, and the cellulose fibers 5, and the core sheet 6 includes the antimicrobial agent 8 and the cellulose fibers (not shown). The absorbent body 1a contains the water-absorbent polymer 3, the antimicrobial agent 8, and the cellulose fibers 5.

The water-absorbent polymer 3 is composed of various hydrogel materials, for example, a crosslinked product of a polymer or copolymer of acrylic acid or an alkali metal salt of acrylic acid, a crosslinked product of polyacrylic acid or a salt thereof and a polyacrylate grafted polymer, a crosslinked product of starch or carboxymethylated cellulose, a crosslinked product of a hydrolysis product of a starch-acrylate grafted copolymer, a crosslinked product of a vinyl alcohol-acrylate copolymer, a crosslinked product of maleic anhydride-grafted polyvinyl alcohol, a crosslinked isobutylene-maleic anhydride copolymer, a saponified product of a vinyl acetate-acrylate copolymer, and the like, and 1 kind or a combination of 2 or more kinds of these components can be used alone. Examples of the shape of the particles of the water-absorbent polymer 3 include a spherical shape, a block shape, a bag shape, and an amorphous shape.

The antibacterial agent 8 can be used without particular limitation as an antibacterial agent for antibacterial use in absorbent articles such as diapers. Examples thereof include antibacterial metals, antibacterial metal carriers, and organic antibacterial agents. Examples of the metal having antibacterial properties include copper, silver, gold, lead, nickel, tin, zinc, iron, and zirconium. Examples of the antibacterial metal support include: a water-insoluble or water-insoluble antibacterial agent such as silver zeolite, a divinylbenzene-2-vinylpyridine silver copolymer (described in, for example, japanese patent application laid-open No. 2006-307404), an aluminum/silver/sodium nitrate silicate (described in, for example, japanese patent application laid-open No. 2005-232654), a silica/zinc oxide/alumina composite carrying silver or zinc (specifically, a metal-substituted cancrinite-like mineral carrying an antibacterial metal), silver zirconium phosphate, and a silver/zinc zeolite mixture. Examples of the organic antibacterial agent include quaternary ammonium salts, and specific examples thereof include cationic antibacterial agents such as cetylbenzalkonium phosphate, benzethonium chloride, benzalkonium chloride, and cetylpyridinium chloride. The antibacterial agent 8 may be used alone or in combination of 2 or more of the above components.

Examples of the cellulose fibers 5 include natural cellulose fibers, regenerated cellulose fibers, and semi-synthetic cellulose fibers. Specific examples thereof include wood pulp fibers, rayon fibers, cotton fibers, and cellulose acetate fibers. As raw material pulp of cellulose fibers, there can be mentioned: wood pulp such as softwood kraft pulp, hardwood kraft pulp and the like; non-wood pulp such as cotton pulp or straw pulp. Furthermore, crosslinked cellulose fibers (pulp fibers) obtained by crosslinking cellulose intramolecularly or intermolecularly with an appropriate crosslinking agent, regenerated cellulose fibers such as rayon fibers having improved crystallinity of cellulose, and the like can also be used. The cellulose fiber can be used alone with the fiber 1 or 2 or more.

The absorbent body 1a may contain synthetic fibers such as thermoplastic fibers together with cellulose fibers. As the thermoplastic fiber, for example, it is possible to use: a single fiber formed using a single synthetic resin such as polyethylene, polypropylene, polyester, or polyurethane, or a composite fiber formed using a synthetic resin such as a composite of 2 or more of these, for example, a core-sheath type or side-by-side type composite fiber formed using 2 or more of the synthetic resins. From the viewpoint of more reliably ensuring the liquid absorption properties of the absorbent body 1a, the content of the synthetic fibers in the absorbent core 4 is preferably 50% by mass or less.

The water-absorbent polymer 3 and the antibacterial agent 8 are bonded to the cellulose fibers 5 via the binder 7. In the absorbent body 1a of the present embodiment, the adhesive 7 is disposed between the absorbent core 4 and the core-covering sheet 6, and the absorbent core 4 and the core-covering sheet 6 are joined via the adhesive 7. At the interface between the absorbent core 4 and the core sheet 6, the water-absorbent polymer 3 and the antimicrobial agent 8 contained in the absorbent core 4 are bonded to the cellulose fibers 5 contained in the absorbent core 4 and the cellulose fibers contained in the core sheet 6 via the adhesive 7 (see fig. 2). At the interface, the antimicrobial agent 8 contained in the core sheet 6 is bonded to the cellulose fibers 5 contained in the absorbent core 4 and the cellulose fibers contained in the core sheet 6 via the adhesive 7. That is, the water-absorbent polymer 3, the antimicrobial agent 8, and the cellulose fibers 5 of the core sheet 6 and the absorbent core 4, respectively, are bonded to the adhesive 7 in the plane direction of the interface.

In the absorbent body 1a of the present embodiment, the adhesive 7 is not disposed on the inner side in the thickness direction Z of the absorbent body 1 a. That is, in the absorbent body of the present invention, a part of the water-absorbent polymer 3 and the antimicrobial agent 8 may be bonded to the cellulose fibers 5 via the binder 7, and not all of the water-absorbent polymer 3 and the antimicrobial agent 8 may be bonded to the cellulose fibers 5 via the binder 7.

Examples of the binder 7 include a water-soluble binder and a water-insoluble binder.

Examples of the water-soluble binder include an anionic binder, a cationic binder, and a nonionic binder. Examples of the anionic binder include: carboxymethyl cellulose salts, poly (meth) acrylic acid, poly (meth) acrylate salts (including partially neutralized products), acrylamide-acrylate salt (including partially neutralized products) copolymers, maleic acid-acrylate salt (including partially neutralized products) copolymers, polyamino acid salts (including partially neutralized products), and the like. Examples of the cationic binder include: cationized starch, cationized sodium carboxymethyl cellulose, cationized polyvinyl alcohol, and the like. Examples of the nonionic binder include: polyvinyl alcohol, polyacrylamide, starch, polyethylene glycol, gum, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, polyvinyl pyrrolidone, and the like. Examples of the water-insoluble adhesive include adhesives composed of hydrophobic thermoplastic resins, and examples thereof include various hot-melt adhesives such as styrene-ethylene-butylene-styrene (SEBS), styrene-isoprene-styrene (SIS), styrene-butylene-styrene (SBS), styrene-ethylene-propylene-styrene (SEPS), Ethylene Vinyl Acetate (EVA), and polyvinyl alcohol (PVA). The binder may be used alone or in combination of 2 or more of the above components.

The absorbent body 1a is used as a main liquid-absorbing part in an absorbent article such as a diaper. The absorbent body 1a having absorbed the body fluid such as urine can continue to fix the antimicrobial agent 8 to the absorbent body 1a after liquid absorption because the antimicrobial agent 8 is bonded to the cellulose fibers 5 together with the water-absorbent polymer 3 via the adhesive 7. This can suppress excessive elution of the antibacterial agent 8 into the body fluid in the absorbent body 1a after liquid absorption. Thus, according to the absorbent body 1a, stickiness due to the returned body fluid can be prevented without reducing the amount of the antibacterial agent. Further, since the amount of the antibacterial agent is not reduced, the antibacterial property of the absorbent body 1a can be ensured. Further, by suppressing the stickiness, a good skin touch can be maintained.

In the present embodiment, the antibacterial agent 8 is attached to the surface of the adhesive 7. In other words, at least a part of the antibacterial agent 8 is in a state of being exposed from the adhesive 7. With this configuration, the exposed portion of the antimicrobial agent comes into contact with the bacteria, thereby further improving the antimicrobial properties of the absorbent body 1 a. On the other hand, in the absorbent body described in patent document 1, the antibacterial agent mixed (internally added) into the binder is buried in the binder, and therefore sufficient antibacterial properties cannot be exhibited.

In order to facilitate adhesion of the antibacterial agent 8 to the surface of the adhesive 7, it is preferable to externally add the antibacterial agent 8 to the adhesive 7 disposed in the absorber by a method such as spraying or misting.

The absorbent body 1a may have the antimicrobial agent 8 embedded in the adhesive 7 together with the antimicrobial agent 8 attached to the surface of the adhesive 7. From the viewpoint of further improving the antibacterial property, it is preferable that the antibacterial agent 8 is present more on the surface of the adhesive 7 than the antibacterial agent 8 buried inside the adhesive 7.

The absorbent core 4 in the absorbent body of the present embodiment contains the water-absorbent polymer 3 and a fibrous material. The absorbent core 4 may also contain cellulose fibers 5. In the case where the absorbent body has the core-covering sheet 6 containing cellulose fibers, the absorbent core 4 may contain no cellulose fibers. From the viewpoint of more reliably ensuring the liquid absorption properties of the absorbent core 4, the content of the cellulose fibers in the absorbent core 4 is preferably 10% by mass or more and 90% by mass or less, and more preferably 20% by mass or more and 80% by mass or less.

Further, a water-absorbent polymer having an antibacterial agent adhered thereto (hereinafter, also referred to as an antibacterial agent adhering water-absorbent polymer) may be scattered on one surface of the core sheet. The antibacterial agent-adhering water-absorbent polymer can be obtained, for example, by adhering antibacterial fine particles to a super-absorbent polymer as described in Japanese patent laid-open publication No. 2016-104119. The absorbent core 4 may be a mixed fiber-laminated body of an antimicrobial agent-adhering water-absorbent polymer and a fiber material.

The absorbent body 1a is equally divided by 3 in the thickness direction Z thereof, and the absorbent body 1a can be divided into an upper layer a, a lower layer C, and an intermediate layer B (see fig. 1) located between these two layers. The upper layer a is a layer disposed closer to the skin in the absorbent article when the absorbent body 1a is assembled in the absorbent article, and the lower layer C is a layer disposed farther from the skin. In the case where the absorbent body has a core-spun sheet, the absorbent body is equally divided by 3 in the thickness direction including the thickness of the core-spun sheet.

In view of improving the liquid retention and the liquid absorption properties of the absorbent body, the water-absorbent polymer 3 is disposed on the top sheet side of the absorbent body, and the grammage of the water-absorbent polymer is preferably higher in the upper layer a or the lower layer C than in the intermediate layer B, more preferably higher in the upper layer a and the lower layer C than in the intermediate layer B, and still more preferably higher in the upper layer a than in the lower layer C. This absorbent body can be obtained, for example, by appropriately changing the dispersion amounts of the water-absorbent polymers in the upper layer a, the intermediate layer B, and the lower layer C so that the water-absorbent polymers are biased to the upper layer a.

From the same viewpoints as described above, the grammage of the water-absorbent polymer of the upper layer a, the intermediate layer B, and the lower layer C is preferably within the following range.

The grammage of the water-absorbent polymer 3 in the upper layer a is preferably 105% or more, more preferably 110% or more, further preferably 200% or less, more preferably 180% or less, further preferably 105% or more and 200% or less, more preferably 110% or more and 180% or less, relative to the grammage of the water-absorbent polymer 3 in the lower layer C.

The grammage of the water-absorbent polymer 3 in the lower layer C is preferably 105% or more, more preferably 110% or more, further preferably 200% or less, more preferably 180% or less, further preferably 105% or more and 200% or less, more preferably 110% or more and 180% or less, relative to the grammage of the water-absorbent polymer 3 in the intermediate layer B.

The grammage of the water-absorbent polymer 3 in the upper layer A is preferably 10g/m, provided that it is higher than the grammage of the water-absorbent polymer 3 in the intermediate layer B and the lower layer C²Above, more preferably 60g/m²The above, preferably 150g/m²Hereinafter, it is more preferably 120g/m²Hereinafter, it is preferably 10g/m²Above and 150g/m²Hereinafter, more preferably 60g/m²Above and 120g/m²The following.

The grammage of the water-absorbent polymer 3 in the lower layer C is higher than that of the water-absorbent polymer 3 in the intermediate layer B and is higher than that of the upper layerThe water-absorbent polymer 3 in the layer A is preferably 10g/m, provided that the grammage is low²Above, more preferably 55g/m²The above, preferably 150g/m²Hereinafter, it is more preferably 115g/m²Hereinafter, it is preferably 10g/m²Above and 150g/m²Hereinafter, more preferably 55g/m²Above and 115g/m²The following.

The grammage of the water-absorbent polymer 3 in the intermediate layer B is preferably 10g/m, provided that it is lower than the grammage of the water-absorbent polymer 3 in the upper layer A and the lower layer C²Above, more preferably 50g/m²The above, preferably 150g/m²Hereinafter, more preferably 110g/m²Hereinafter, it is preferably 10g/m²Above and 150g/m²Hereinafter, more preferably 50g/m²Above and 110g/m²The following.

In view of improving liquid diffusibility and liquid absorption properties of the absorbent body, the cellulose fibers 5 are disposed on the top sheet side of the absorbent body, and the grammage of the cellulose fibers is preferably higher in the upper layer a or the lower layer than in the intermediate layer B, more preferably higher in the upper layer a and the lower layer C than in the intermediate layer B, and still more preferably higher in the lower layer C than in the upper layer a. This absorbent body can be obtained, for example, by appropriately changing the content of cellulose fibers in the upper layer a, the intermediate layer B, and the lower layer C, or by including cellulose fibers in the core sheet 6 covering the surface of the absorbent core.

From the same viewpoint as described above, the grammage of the cellulose fibers in the upper layer a, the intermediate layer B, and the lower layer C is preferably in the following range.

The grammage of the cellulose fibers 5 in the lower layer C is preferably 105% or more, more preferably 110% or more, further preferably 200% or less, more preferably 180% or less, further preferably 105% or more and 200% or less, more preferably 110% or more and 180% or less, relative to the grammage of the cellulose fibers 5 in the upper layer a.

The grammage of the cellulose fibers 5 in the upper layer a is preferably 105% or more, more preferably 110% or more, further preferably 200% or less, more preferably 180% or less, further preferably 105% or more and 200% or less, more preferably 110% or more and 180% or less, relative to the grammage of the cellulose fibers 5 in the intermediate layer B.

The grammage of the cellulose fibers 5 in the lower layer C is preferably 10g/m, provided that it is higher than the grammage of the cellulose fibers 5 in the intermediate layer B and the upper layer A²Above, more preferably 60g/m²The above, preferably 150g/m²Hereinafter, it is more preferably 120g/m²Hereinafter, it is preferably 10g/m²Above and 150g/m²Hereinafter, more preferably 60g/m²Above and 120g/m²The following.

The grammage of the cellulose fiber 5 in the upper layer a is preferably 10g/m, provided that it is higher than the grammage of the cellulose fiber 5 in the intermediate layer B and lower than the grammage of the cellulose fiber 5 in the lower layer C²Above, more preferably 55g/m²The above, preferably 150g/m²Hereinafter, it is more preferably 115g/m²Hereinafter, it is preferably 10g/m²Above and 150g/m²Hereinafter, more preferably 55g/m²Above and 115g/m²The following.

The grammage of the cellulose fibers 5 in the intermediate layer B is preferably 10g/m, provided that it is lower than the grammage of the cellulose fibers 5 in the upper layer A and the lower layer C²Above, more preferably 50g/m²The above, preferably 150g/m²Hereinafter, more preferably 110g/m²Hereinafter, it is preferably 10g/m²Above and 150g/m²Hereinafter, more preferably 50g/m²Above and 110g/m²The following.

In order to further improve the antibacterial properties, the antibacterial agent 8 is disposed on the top layer side of the absorbent body, and the upper layer a or the lower layer C preferably has a higher grammage of the antibacterial agent than the intermediate layer B, more preferably has a higher grammage of the antibacterial agent than the intermediate layer B, and even more preferably has a higher grammage of the antibacterial agent than the upper layer a. The absorbent body can be obtained, for example, by appropriately changing the content of the antibacterial agent in the upper layer a, the intermediate layer B, and the lower layer C, or by spreading the antibacterial agent at the interface between the absorbent core 4 and the core-spun sheet 6 in consideration of grammage.

From the same viewpoint as described above, the grammage of the antibacterial agent in the upper layer a, the intermediate layer B, and the lower layer C is preferably within the following range.

The gram weight of the antibacterial agent 8 in the lower layer C is preferably 105% or more, more preferably 110% or more, further preferably 200% or less, more preferably 180% or less, further preferably 105% or more and 200% or less, more preferably 110% or more and 180% or less, relative to the gram weight of the antibacterial agent 8 in the upper layer a.

The grammage of the antibacterial agent 8 in the upper layer a is preferably 105% or more, more preferably 110% or more, further preferably 200% or less, more preferably 180% or less, further preferably 105% or more and 200% or less, more preferably 110% or more and 180% or less, relative to the grammage of the antibacterial agent 8 in the intermediate layer B.

The gram weight of the antibacterial agent 8 in the lower layer C is preferably 0.00003g/m, provided that the gram weight is higher than the gram weight of the antibacterial agent 8 in the intermediate layer B and the upper layer A²Above, more preferably 0.0001g/m²The above, and preferably 0.3g/m²Hereinafter, more preferably 0.1g/m²Hereinafter, it is preferably 0.00003g/m²Above and 0.3g/m²Hereinafter, more preferably 0.0001g/m²Above and 0.1g/m²The following.

The gram weight of the antibacterial agent 8 in the upper layer A is preferably 0.00003g/m, which is higher than the gram weight of the antibacterial agent 8 in the intermediate layer B and lower than the gram weight of the antibacterial agent 8 in the lower layer C²Above, more preferably 0.00009g/m²The above, and preferably 0.3g/m²Hereinafter, more preferably 0.09g/m²Hereinafter, it is preferably 0.00003g/m²Above and 0.3g/m²The amount of the surfactant is more preferably 0.00009g/m or less²Above and 0.09g/m²The following.

The gram weight of the antibacterial agent 8 in the intermediate layer B is preferably 0.00003g/m, provided that it is lower than the gram weight of the antibacterial agent 8 in the upper layer A and the lower layer C²Above, more preferably 0.00008g/m²The above, and preferably 0.3g/m²Hereinafter, more preferably 0.08g/m²Hereinafter, it is preferably 0.00003g/m²Above and 0.3g/m²The followingMore preferably 0.00009g/m²Above and 0.08g/m²The following.

In order to more reliably fix the antimicrobial agent, the adhesive 7 is disposed on the top sheet side of the absorbent body, and the grammage of the adhesive is preferably higher in the top sheet a or the bottom sheet C than in the intermediate sheet B, more preferably higher in the top sheet a and the bottom sheet C than in the intermediate sheet B, and still more preferably higher in the bottom sheet C than in the top sheet a. This absorbent body can be obtained, for example, by appropriately arranging an adhesive at the interface of the absorbent core 4 and the core sheet 6 in consideration of the grammage.

From the same viewpoint as described above, the grammage of the adhesive in the upper layer a, the intermediate layer B, and the lower layer C is preferably within the following range.

The grammage of the adhesive 7 in the lower layer C is preferably 105% or more, more preferably 110% or more, further preferably 200% or less, more preferably 180% or less, further preferably 105% or more and 200% or less, more preferably 110% or more and 180% or less, relative to the grammage of the adhesive 7 in the upper layer a.

The grammage of the adhesive 7 in the upper layer a is preferably 105% or more, more preferably 110% or more, further preferably 200% or less, more preferably 180% or less, further preferably 105% or more and 200% or less, more preferably 110% or more and 180% or less, relative to the grammage of the adhesive 7 in the intermediate layer B.

The grammage of the adhesive 7 in the lower layer C is preferably 1g/m, provided that it is higher than the grammage of the adhesive 7 in the intermediate layer B and the upper layer A²Above, more preferably 4g/m²The above is preferably 20g/m²Hereinafter, more preferably 19g/m²Hereinafter, it is preferably 1g/m²Above and 20g/m²Hereinafter, more preferably 4g/m²Above and 19g/m²The following.

The grammage of the adhesive 7 in the upper layer a is preferably 1g/m, provided that it is higher than the grammage of the adhesive 7 in the intermediate layer B and lower than the grammage of the adhesive 7 in the lower layer C²Above, more preferably 3g/m²The above is preferably 20g/m²Hereinafter, more preferably 18g/m²Hereinafter, it is preferably 1g/m²Above and 20g/m²Hereinafter, it is more preferably 3g/m²Above and 18g/m²The following.

The grammage of the adhesive 7 in the intermediate layer B is preferably 1g/m, provided that it is lower than the grammage of the adhesive 7 in the upper layer A and the lower layer C²Above, more preferably 2g/m²The above is preferably 20g/m²Hereinafter, more preferably 17g/m²Hereinafter, it is preferably 1g/m²Above and 20g/m²Hereinafter, more preferably 2g/m²Above and 17g/m²The following.

The respective grammage of the water-absorbent polymer, cellulose fiber, antibacterial agent and binder was measured by the following method.

< method for measuring the respective grammage of water-absorbent polymer, cellulose fiber, antibacterial agent and adhesive >

The absorbent body was divided into 3 equal parts in the thickness direction, and the upper layer a, the intermediate layer B, and the lower layer C were cut out. After the mass of each of the above layers was measured, the water-absorbent polymer and the fiber material of each of the above layers were separated, and the mass of each of the water-absorbent polymer and the fiber material was further measured. The separation of the water-absorbent polymer from the fiber material can use various methods capable of almost completely separating the water-absorbent polymer from the fiber material without particular limitation. For example, the weight before and after scattering of the pulp may be measured by screening with a fine mesh screen using the difference in particle size or by setting the difference in mass to the air flow rate at which only the pulp is scattered. The weight of the remaining fibers after water washing may be determined by immersing each layer in an ascorbic acid solution and exposing the layer to sunlight to dissolve the water-absorbent polymer, and the mass of the remaining fibers after water washing may be subtracted from the weight of the cut absorbent body. The identification of the types of cellulose-based fibers and other fibers in the separated fibrous material, and the analysis of the mass and content ratio of the identified fibers can be appropriately performed according to the standards of JIS L1030-1 (identification of fibers in part 1) and JIS L1030-2 (test method for the mixing ratio of fibrous products in part 2).

The upper layer A, the intermediate layer B and the lower layer C which are taken out are respectively selected from arbitrary layers in a plan viewCutting 300mm of the free part²This was used as a measurement sample. The cutting area at one part is less than 300mm²In this case, measurement samples were cut from a plurality of positions so that the total area was 300mm²The above. Next, the measurement sample is subjected to a multi-stage solvent extraction method from a nonpolar solvent to a polar solvent, and the antibacterial agent and the binder present in each layer are separated to obtain a solution containing a single composition. The obtained solution is dried to be solidified, and the chemical structures of the antibacterial agent and the binder are determined by combination of 1H-NMR (nuclear magnetic resonance), IR (infrared spectroscopy), LC (liquid chromatography), GC (gas chromatography), MS (mass spectrometry), GPC (gel permeation chromatography), fluorescent X-ray, and the like. Further, a calibration curve is prepared by a known analysis method such as GC or LC using a drug having a specific chemical structure as a standard substance, and the antibacterial agent and the binder in the measurement sample are quantified. Based on the quantitative result, the grammage of the antibacterial agent or the adhesive is determined. When a plurality of antibacterial agents are present in a measurement sample, the gram weight of the antibacterial agent is determined based on the total mass of the respective antibacterial agents. Similarly, when a plurality of binders are present in the measurement sample, the grammage of the binder is determined based on the total mass of the binders.

From the viewpoint of further reducing the antimicrobial agent in the returned body fluid and further suppressing the sliminess, the antimicrobial agent is preferably a component that exhibits a positive charge when ionized in water. When the water-absorbent polymer is a component that exhibits negative charge when ionized in water, the antimicrobial agent can be more firmly fixed by the interaction between the antimicrobial agent and the water-absorbent polymer. Examples of such an antibacterial agent include the cationic antibacterial agents described above.

From the viewpoint of improving the fixing property of the antibacterial agent 8 in the absorber and further suppressing the back flow of the antibacterial agent together with the body fluid, the binder 7 is preferably made of a hydrophobic thermoplastic resin. Examples of the hydrophobic thermoplastic resin include the hot melt adhesive.

From the viewpoint of improving the absorption performance of the absorbent body 1a, if the object is urine, the water-absorbent polymer 3 is preferably capable of absorbing and retaining 20 times or more, particularly preferably capable of absorbing and retaining 30 times or more of its own weight, and if it is blood, the water-absorbent polymer 3 is preferably capable of absorbing and retaining 1 time or more, more preferably capable of absorbing and retaining 3 times or more of its own weight. The upper limit of the water absorption/retention of the water-absorbent polymer 3 is not particularly limited, but can be set to a general standard of 1000 times the weight of the polymer itself.

As the core sheet 6, a sheet having liquid permeability conventionally used for an absorbent body in the art can be used without particular limitation. Examples of the core sheet 6 include a fibrous sheet such as paper such as tissue paper and nonwoven fabric (spun bond nonwoven fabric, spunlace nonwoven fabric such as acrylic fiber and rayon), and an apertured film. The core-spun sheet 6 is preferably liquid-permeable and hydrophilic, and a material containing hydrophilic fibers can be used.

The core sheet 6 may have a structure disposed in the upper layer a and a structure disposed in the lower layer C, in which the grammage of the cellulose fibers is different. From the viewpoint of further improving the liquid diffusibility, the core sheet 6b disposed in the lower layer C preferably has a higher grammage of cellulose fibers than the core sheet 6a disposed in the upper layer a. From the same viewpoint as described above, the grammage of the cellulose fibers in the

core sheets

6a and 6b disposed in the upper layer a and the lower layer C, respectively, is preferably in the range below. The core-spun sheet 6b disposed in the lower layer C is preferably 105% or more, more preferably 110% or more, further preferably 200% or less, more preferably 180% or less, further preferably 105% or more and 200% or less, more preferably 110% or more and 180% or less, of the core-spun sheet 6a disposed in the upper layer a.

The grammage of the cellulose fibers 5 in the core sheet 6b disposed in the lower layer C is preferably 5g/m, provided that it is higher than the grammage of the cellulose fibers in the core sheet 6a disposed in the upper layer a²Above, more preferably 8g/m²The above is preferably 40g/m²Hereinafter, more preferably 30g/m²Hereinafter, it is preferably 5g/m²Above and 40g/m²Hereinafter, more preferably 8g/m²Above and 30g/m²The following.

The grammage of the cellulose fibers 5 in the core sheet 6a disposed in the upper layer a is preferably 5g/m²Above, more preferably7g/m²Above, it is preferably 38g/m²Hereinafter, more preferably 28g/m²Hereinafter, it is preferably 5g/m²Above 38g/m²Hereinafter, more preferably 7g/m²Above and 28g/m²The following.

The core-spun sheet 6 of the present embodiment contains cellulose fibers (not shown), but when the absorbent core 4 contains cellulose fibers, the core-spun sheet 6 may not contain cellulose fibers.

In the present embodiment, one surface of the core sheet 6 carries the antibacterial agent 8 through the adhesive 7 applied to the surface, and is joined to the surface of the absorbent core 4. From the viewpoint of improving the liquid absorption properties of the absorbent body, when the binder 7 is applied to one surface of the core sheet 6, the binder 7 is preferably applied in a fiber network (i.e., in a fibrous and mesh-like shape) in an irregular or regular manner. From the same viewpoint as above, the adhesive 7 is preferably applied to produce an uncoated portion using a screw type, crest type, omega type, or curtain type apparatus, for example. In the case where the application width of each device is limited, a plurality of application devices may be used according to the desired application width, or a device for spraying an adhesive in mist form may be used.

From the viewpoint of improving the liquid absorption properties of the absorbent body, the coating amount (grammage) of the binder 7 in the core sheet 6 is preferably 1g/m²Above and 20g/m²Hereinafter, more preferably 2g/m²Above and 18g/m²Hereinafter, it is more preferably 3g/m²Above and 17g/m²The following.

Fig. 3 to 6 show other embodiments of the absorbent body of the present invention. The following embodiments 2 to 5 will be mainly described with respect to components different from those of embodiment 1 shown in fig. 1 and 2, and the same components are given the same reference numerals and will not be described. The description of embodiment 1 can be applied to the constituent elements not specifically described.

In the foregoing embodiment 1, the absorbent core 4 contains the water-absorbent polymer 3 and the cellulose fibers 5, but the absorbent body 1b of the embodiment 2 shown in fig. 3 is composed of a laminate in which the core-covering

sheets

6a and 6b and the water-absorbent polymer 3 are laminated. That is, in the absorbent body 1b, the water-absorbent polymer 3 is disposed between the

core sheets

6a and 6b, and the water-absorbent polymer 3 constitutes the absorbent core 4. In the present embodiment, the core-spun sheet 6 is coated with the adhesive 7 on one surface thereof, and the antibacterial agent 8 is dispersed in the adhesive 7. The core-spun sheet 6 of the absorbent body 1b of the present embodiment contains cellulose fibers (not shown) and an antimicrobial agent 8. The water-absorbent polymer 3 in the absorbent body 1b and the antibacterial agent 8 in the core-spun sheet 6 and the antibacterial agent 8 scattered on the binder 7 are bonded to the cellulose fibers in the core-spun sheet 6 in the planar direction via the binder 7. The absorbent body 1b can be produced by the following method, for example. First, 2 core-spun sheets each having one surface coated with the binder 7 were prepared, and the surface coated with the binder 7 in one core-spun sheet was sprayed with the water-absorbent polymer 3. The absorbent body was obtained by overlapping another core-spun sheet with the surface coated with the adhesive 7 facing the water-absorbent polymer 3. The absorbent is a polymer sheet having a structure in which a water-absorbent polymer 3 is sandwiched between core sheets. The absorbent body of the present embodiment may be a laminate of a stacked body of the

core sheets

6a and 6b and the water-absorbent polymer, or a laminate of a mixed dried body of the

core sheets

6a and 6b and the water-absorbent polymer. The mixed dried product is obtained by, for example, drying a mixed liquid containing a water-absorbent polymer and a water-soluble polymer.

An absorbent core 4 in an absorbent body 1c of embodiment 3 shown in fig. 4 has the same structure as the absorbent body 1b of embodiment 2 except that it has a mixed fiber layer 41 and a water-absorbent polymer layer 43. The mixed fiber-laminated layer 41 is composed of a mixed fiber-laminated body of the water-absorbent polymer 3 and a fiber material. The mixed cellulose layer 41 contains cellulose fibers 5 as a fiber material. The water-absorbent polymer layer 43 is composed of a stacked body of the water-absorbent polymer 3. In the absorbent body 1c of the present embodiment, the core sheet 6 contains cellulose fibers (not shown) and the antimicrobial agent 8. The water-absorbent polymer 3 in the mixed fiber layer 41 and the antibacterial agent 8 in the core-spun sheet 6 and the antibacterial agent 8 scattered on the binder 7 of the present embodiment are bonded to the cellulose fibers in the mixed fiber layer 41 and the core-spun sheet 6 in the planar direction via the binder 7. The absorbent body 1c can be obtained by, for example, laminating the mixed fiber assembly and the water-absorbent polymer between the

core sheets

6a and 6 b. The water-absorbent polymer layer 43 may be produced by disposing a water-absorbent polymer, a stacked body of water-absorbent polymers, or the aforementioned dry mixture in a core-spun sheet having one surface coated with the adhesive 7. The antibacterial agent may be dispersed on the surface of the core-spun sheet coated with the binder 7.

From the viewpoint of improving the liquid absorption properties of the absorbent body, the mixed fiber layer 41 is preferably disposed on the upper layer a side of the water-absorbent polymer layer 43 in the thickness direction Z of the absorbent body.

In the above-described embodiments 1 to 3, the adhesive 7 is disposed between the core sheet 6 and the absorbent core 4, but the absorbent core may contain the adhesive 7. The absorbent core 4a of embodiment 4 shown in fig. 5 and 6 includes a composite 10 in which a water-absorbent polymer 3, an antimicrobial agent 8, and cellulose fibers 5 are bonded together with an adhesive.

As shown in fig. 5 and 6, in the composite 10a according to embodiment 4, the binder 7a is fibrous. In the composite 10a, the bonding method via the fibrous binder 7a is not particularly limited, and the water-absorbent polymer 3 and the antimicrobial agent 8 to be bonded may be single or plural. The fibrous adhesive 7a is preferably a hydrophilic adhesive having a fibrous form, and examples of the component thereof include polyvinyl alcohol, carboxymethyl cellulose, and the like. The absorbent core 4a including the composite 10a can be obtained by, for example, mixing the fibrous binder 7a, the water-absorbent polymer 3, and the antimicrobial agent 8 to obtain a bonded body in which the water-absorbent polymer 3 and the antimicrobial agent 8 are bonded to each other, and then mixing and stacking the bonded body and the cellulose fibers 5. Alternatively, the antibacterial agent-adhering water-absorbent polymer may be mixed with the fibrous binder 7a to form a mixture, and the mixture may be stacked on the cellulose fibers 5. Alternatively, the surface of the mixed fiber product of the antimicrobial-adhering water-absorbent polymer and the cellulose fiber may be coated with a fibrous binder 7a and a core-covering sheet containing cellulose fiber. In this case, the absorbent core is formed by mixing the fibers, and the composite 10a is formed at the interface between the absorbent core and the core sheet.

The composite 10a in embodiment 4 is formed of the fibrous binder 7a, but the binder forming the composite 10 may not be fibrous. In the composite 10b according to embodiment 5, a part of the surface of the water-absorbent polymer 3 is coated with the binder 7, and the water-absorbent polymer 3 and the antimicrobial agent 8 are bonded to the cellulose fibers 5 in the coated portion (see fig. 7). The absorbent core containing the composite 10b can be obtained by, for example, spraying an adhesive 7 on a part of the surface of the water-absorbent polymer 3, mixing the adhesive with the antibacterial agent 8 to obtain a bonded body in which the water-absorbent polymer 3 and the antibacterial agent 8 are bonded, and then mixing and stacking the bonded body with the cellulose fibers 5.

The absorbent cores in

embodiments

4 and 5 may contain the water-absorbent polymer 3, the antimicrobial agent 8, and the cellulose fibers 5, which are not formed into the composite, together with the composite 10. That is, all of the water-absorbent polymer 3, the antimicrobial agent 8, and the cellulose fibers 5 in the absorbent core may be formed into the composite 10, or may be formed into the composite 10.

Further, the absorbent bodies of the 4 th and 5 th embodiments may or may not include a core sheet.

The above-described absorber can be preferably used as an absorber of an absorbent article. An absorbent article is an article mainly used for absorbing and retaining body fluids excreted from the body, such as urine and menstrual blood. Examples of the absorbent article include, but are not limited to, disposable diapers, sanitary napkins, incontinence pads, panty liners, and the like, and articles for absorbing liquid discharged from a human body are widely included. An absorbent article typically has a front sheet and a back sheet, and has a liquid retentive absorbent body disposed between these two sheets. The absorbent article may also have various components depending on its specific use. Such components are well known to those skilled in the art.

The present invention has been described above based on preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. For example, in the above embodiment, the core sheet 6 is composed of two sheets and is disposed on the upper layer a and the lower layer C of the absorbent body, but the core sheet may be composed of one sheet. In this case, the core sheet 6 may cover the entire outer surface of the absorbent core 4. For example, only one core sheet 6 may be used, the entire outer surface of the absorbent core 4 may be cylindrically covered with the core sheet 6, and both ends of the opening of the cylindrically-shaped core sheet 6 may be sealed by bonding, pressure bonding, or the like.

In the above embodiment, the core-wrapped sheet 6 and the absorbent core 4 are opposed in direct contact in a state where no article is present between the core-wrapped sheet 6 and the absorbent core 4, but the core-wrapped sheet 6 and the absorbent core 4 may be opposed in a state where a sheet such as a nonwoven fabric is present between the core-wrapped sheet 6 and the absorbent core 4.

The present invention further discloses the following absorbent body and absorbent article having the same in relation to the above embodiment.

<1>

An absorbent material comprising a water-absorbent polymer, an antimicrobial agent and cellulose fibers, wherein the water-absorbent polymer and the antimicrobial agent are bonded to the cellulose fibers via a binder.

<2>

The absorber according to the above <1>, wherein the antibacterial agent is attached to a surface of the adhesive.

<3>

The absorber according to the above <2>, wherein the antimicrobial agent buried in the inside of the adhesive is present in a larger amount on the surface of the adhesive than the antimicrobial agent buried in the inside of the adhesive.

<4>

The absorbent body according to any one of the above <1> to <3>, wherein when the absorbent body is divided into an upper layer disposed on a side closer to the skin, a lower layer disposed on a side farther from the skin, and an intermediate layer positioned between the upper layer and the lower layer in the absorbent article by dividing the absorbent body into 3 equal parts in a thickness direction, the grammage of the water-absorbent polymer is higher in the upper layer or the lower layer than in the intermediate layer.

<5>

The absorbent body according to the above <4>, wherein the upper layer has a higher grammage of the water-absorbent polymer than the lower layer.

<6>

The absorbent body according to the above <4> or <5>, wherein the grammage of the water-absorbent polymer in the upper layer is 105% or more and 200% or less, preferably 110% or more and 180% or less, with respect to the grammage of the water-absorbent polymer in the lower layer.

<7>

The absorbent body according to any one of the above <4> to <6>, wherein the grammage of the water-absorbent polymer in the lower layer is 105% or more and 200% or less, preferably 110% or more and 180% or less, relative to the grammage of the water-absorbent polymer in the intermediate layer.

<8>

As described above<4>～<7>The absorbent body of any one of the above, wherein the water-absorbent polymer in the upper layer has a grammage of 10g/m²Above and 150g/m²Hereinafter, it is preferably 60g/m²Above and 120g/m²The following.

<9>

The absorbent body according to any one of the above <1> to <8>, wherein when the absorbent body is divided into an upper layer disposed on a side closer to the skin, a lower layer disposed on a side farther from the skin, and an intermediate layer positioned between the upper layer and the lower layer in the absorbent article by dividing the absorbent body into 3 equal parts in the thickness direction, the grammage of the cellulose fiber is higher in the upper layer or the lower layer than in the intermediate layer.

<10>

The absorbent body according to the above <9>, wherein the lower layer has a higher grammage of the cellulose fibers than the upper layer.

<11>

The absorbent according to the above <9> or <10>, wherein the grammage of the cellulose fibers in the upper layer is 105% or more and 200% or less, preferably 110% or more and 180% or less, relative to the grammage of the cellulose fibers in the intermediate layer.

<12>

The absorbent body according to any one of the above <9> to <11>, wherein the grammage of the cellulose fibers in the lower layer is 105% or more and 200% or less, preferably 110% or more and 180% or less, relative to the grammage of the cellulose fibers in the upper layer.

<13>

As described above<9>～<12>The absorbent body according to any one of the above, wherein the grammage of the cellulose fiber in the lower layer is 10g/m²Above and 150g/m²Hereinafter, it is preferably 60g/m²Above and 120g/m²The following.

<14>

The absorbent body according to any one of the above <1> to <13>, wherein when the absorbent body is divided into an upper layer disposed on a side closer to the skin, a lower layer disposed on a side farther from the skin, and an intermediate layer positioned between the upper layer and the lower layer in the absorbent article by equally dividing the absorbent body by 3 in the thickness direction, the grammage of the antibacterial agent is higher in the upper layer or the lower layer than in the intermediate layer.

<15>

The absorbent body according to the above <14>, wherein the lower layer has a higher grammage of the antimicrobial agent than the upper layer.

<16>

The absorbent body according to the above <14> or <15>, wherein the grammage of the antibacterial agent in the upper layer is 105% or more and 200% or less, preferably 110% or more and 180% or less, with respect to the grammage of the antibacterial agent in the intermediate layer.

<17>

The absorbent body according to any one of the above <14> to <16>, wherein the gram weight of the antibacterial agent in the lower layer is 105% to 200%, preferably 110% to 180%, relative to the gram weight of the antibacterial agent in the upper layer.

<18>

As described above<14>～<17>Any one ofThe absorbent body of (4), wherein the gram weight of the antibacterial agent in the lower layer is 0.00003g/m²Above and 0.3g/m²Hereinafter, it is preferably 0.0001g/m²Above and 0.1g/m²The following.

<19>

The absorbent body according to any one of the above <1> to <18>, wherein when the absorbent body is divided into an upper layer disposed on a side closer to the skin, a lower layer disposed on a side farther from the skin, and an intermediate layer positioned between the upper layer and the lower layer in the absorbent article by dividing the absorbent body into 3 equal parts in the thickness direction, the grammage of the adhesive agent is higher in the upper layer or the lower layer than in the intermediate layer.

<20>

The absorbent body according to the above <19>, wherein the lower layer has a higher grammage of the adhesive than the upper layer.

<21>

The absorbent body according to the above <19> or <20>, wherein a grammage of the adhesive in the upper layer is 105% or more and 200% or less, preferably 110% or more and 180% or less, with respect to a grammage of the adhesive in the intermediate layer.

<22>

The absorbent body according to any one of the above <19> to <21>, wherein the grammage of the adhesive in the lower layer is 105% or more and 200% or less, preferably 110% or more and 180% or less, relative to the grammage of the adhesive in the upper layer.

<23>

As described above<19>～<22>The absorbent body of any one of the above, wherein the grammage of the adhesive in the upper layer is 1g/m²Above and 20g/m²Hereinafter, it is preferably 3g/m²Above and 18g/m²The following.

<24>

The absorber according to any one of the above <1> to <23>, wherein the absorber includes: an absorbent core containing the water-absorbent polymer, the antibacterial agent and the cellulose fiber; and a core-covering sheet covering the outer surface of the absorbent core,

when the absorbent body is divided into an upper layer disposed closer to the skin, a lower layer disposed farther from the skin, and an intermediate layer positioned between the upper layer and the lower layer in the absorbent article by dividing the absorbent body into 3 equal parts in the thickness direction, the weight of the cellulose fiber in the core sheet disposed in the lower layer is higher than that in the core sheet disposed in the upper layer.

<25>

The absorber according to any one of the above <1> to <24>, wherein the antimicrobial agent is a component that exhibits a positive charge when ionized in water.

<26>

The absorbent according to the above <25>, wherein the antimicrobial agent is 1 or 2 or more selected from the group consisting of cetylbenzylammonium phosphate, benzethonium chloride, benzalkonium chloride and cetylpyridinium chloride.

<27>

The absorbent body according to any one of the above <1> to <26>, wherein the binder is composed of a hydrophobic thermoplastic resin.

<28>

The absorbent material according to the above <27>, wherein the hydrophobic thermoplastic resin is 1 or 2 or more selected from the group consisting of styrene-ethylene-butylene-styrene (SEBS), styrene-isoprene-styrene (SIS), styrene-butylene-styrene (SBS), styrene-ethylene-propylene-styrene (SEPS), Ethylene Vinyl Acetate (EVA), and polyvinyl alcohol (PVA).

<29>

An absorbent article having a front sheet and a back sheet, wherein the absorbent body according to any one of the items <1> to <28> is provided between the front sheet and the back sheet.

Industrial applicability of the utility model

According to the present invention, it is possible to provide an absorbent body and an absorbent article including the same, which achieve both antibacterial properties of the absorbent body and suppression of stickiness due to a body fluid that flows back.

Claims

1. An absorbent body, characterized in that:

comprising a water-absorbent polymer, an antibacterial agent and cellulose fibers, the water-absorbent polymer and the antibacterial agent being bonded to the cellulose fibers via a binder,

when the absorbent body is divided into an upper layer disposed closer to the skin, a lower layer disposed farther from the skin, and an intermediate layer located between the upper layer and the lower layer in the absorbent article by equally dividing the absorbent body in the thickness direction by 3, the grammage of the water-absorbent polymer is higher in the upper layer or the lower layer than in the intermediate layer.

2. The absorbent of claim 1, wherein:

the antimicrobial agent is attached to a surface of the adhesive.

3. The absorbent of claim 2, wherein:

having the antibacterial agent buried inside the adhesive, there is more of the antibacterial agent attached to the surface of the adhesive than the antibacterial agent buried inside the adhesive.

4. The absorbent of claim 1, wherein:

the upper layer has a higher grammage than the lower layer.

5. The absorbent body according to claim 4, wherein:

the grammage of the water-absorbent polymer in the upper layer is 105% to 200% of the grammage of the water-absorbent polymer in the lower layer.

6. An absorbent body according to claim 1, wherein:

the grammage of the water-absorbent polymer in the lower layer is 105% to 200% of the grammage of the water-absorbent polymer in the intermediate layer.

7. An absorbent body according to claim 1, wherein:

the grammage of the water-absorbent polymer in the upper layer is 10g/m²Above and 150g/m²The following.

8. The absorbent of claim 1, wherein:

the upper layer or the lower layer has a higher grammage of the cellulose fibers than the intermediate layer.

9. The absorbent of claim 8, wherein:

the lower layer has a higher grammage of the cellulose fibers than the upper layer.

10. The absorbent of claim 8, wherein:

the grammage of the cellulose fibers in the upper layer is 105% to 200% of the grammage of the cellulose fibers in the intermediate layer.

11. The absorbent of claim 9, wherein:

the grammage of the cellulose fibers in the lower layer is 105% to 200% with respect to the grammage of the cellulose fibers in the upper layer.

12. The absorbent of claim 8, wherein:

the gram weight of the cellulose fiber in the lower layer is 10g/m²Above and 150g/m²The following.

13. The absorbent of claim 1, wherein:

the upper layer or the lower layer has a higher grammage of the antibacterial agent than the intermediate layer.

14. The absorbent body according to claim 13, wherein:

the lower layer has a higher grammage of the antimicrobial agent than the upper layer.

15. The absorbent body according to claim 13, wherein:

the gram weight of the antibacterial agent in the upper layer is 105% to 200% of the gram weight of the antibacterial agent in the intermediate layer.

16. The absorbent body of claim 14, wherein:

the gram weight of the antibacterial agent in the lower layer is 105% to 200% of the gram weight of the antibacterial agent in the upper layer.

17. The absorbent body according to claim 13, wherein:

the gram weight of the antibacterial agent in the lower layer is 0.00003g/m²Above and 0.3g/m²The following.

18. The absorbent of claim 1, wherein:

the upper layer or the lower layer has a higher grammage of the adhesive than the intermediate layer.

19. An absorbent body according to claim 18, wherein:

the lower layer has a higher grammage of the adhesive than the upper layer.

20. The absorbent body of claim 19, wherein:

the grammage of the adhesive in the upper layer is 105% or more and 200% or less with respect to the grammage of the adhesive in the intermediate layer.

21. The absorbent body of claim 19, wherein:

the grammage of the adhesive in the lower layer is 105% or more and 200% or less with respect to the grammage of the adhesive in the upper layer.

22. The absorbent body of claim 18, wherein:

the grammage of the adhesive in the upper layer is 1g/m²Above and 20g/m²The following.

23. The absorbent of claim 1, wherein:

the absorbent body includes: an absorbent core containing the water-absorbent polymer, the antibacterial agent and the cellulose fibers; and a core-covering sheet covering the outer surface of the absorbent core,

the core-spun sheet disposed in the lower layer has a higher grammage of cellulose fibers than the core-spun sheet disposed in the upper layer.

24. An absorbent article characterized by:

comprising a front sheet and a back sheet, and an absorbent body according to any one of claims 1 to 23 between the front sheet and the back sheet.