JP7236880B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles.

The present applicant has previously proposed an absorbent article that deodorizes excrement odors such as urine odors (see Patent Document 1). This absorbent article has a skin-contacting surface, a non-skin-contacting surface, and an absorbent body positioned therebetween, and further comprises a material having a function of polymerizing a phenolic compound and a porous material having a phenyl group in at least a portion thereof. By containing a toxic polymer, it is possible to effectively deodorize bad odors caused especially by urine.

JP 2017-140332 A

Since the absorbent article of Patent Document 1 uses a material having a function of polymerizing a phenolic compound, it is possible to effectively remove odorous components such as phenol and cresol through polymerization to deodorize the absorbent article. However, the above materials may also act on components other than phenolic compounds in excrement, and there is a possibility that the absorbent body after absorbing excrement will be discolored, and the appearance of the absorbent article will be deteriorated accordingly. There is room for improvement in that there is a risk of

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an absorbent article capable of overcoming the above-mentioned drawbacks.

The present invention comprises an absorbent body having an absorbent core containing a water-absorbent polymer and hydrophilic fibers, and a core wrap sheet covering the absorbent core,
A polymerized deodorizing material is arranged between the absorbent core and the core wrap sheet on the side facing the skin of the absorbent body, and a liquid-permeable sheet is provided between the polymerized deodorant material and the absorbent core. to separate the polymerized deodorant material from the absorbent core.

ADVANTAGE OF THE INVENTION According to the present invention, there is provided an absorbent article that effectively deodorizes bad odors caused by excrement, especially urine, and has a good appearance even after absorption of excrement.

FIG. 1 is a cross-sectional view showing one embodiment of an absorbent article. FIG. 2 is a cross-sectional view showing another embodiment of an absorbent article. FIG. 3 is an enlarged view showing an arrangement form of constituent members of an absorbent body in an absorbent article. FIG. 4 is an enlarged view showing another arrangement form of the constituent members of the absorbent body in the absorbent article.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the absorbent article of the present invention will be described based on its preferred embodiments with reference to the drawings. The absorbent article of the present invention has a vertically long shape having a longitudinal direction corresponding to a direction extending from the wearer's abdomen to the back through the crotch and a width direction orthogonal thereto. The absorbent article has a crotch part arranged in the crotch part of the wearer and an abdominal part and a back part extending in the front and rear of the crotch part. The crotch portion has an excretion-part-facing portion that is arranged to face the wearer's excretion-part when the absorbent article is worn, and the excretion-part-facing portion is usually at or near the center of the absorbent article in the longitudinal direction. located in

The absorbent article of the present invention comprises a topsheet located on the wearer's skin-facing side, a backsheet located on the non-skin-facing side, and an absorbent body interposed between the two sheets. A cross-sectional view of one embodiment of an absorbent article is shown in FIG. As shown in the figure, the absorbent article 1 comprises a topsheet 2, a backsheet 3, and an absorbent body 4 interposed between the sheets 2,3. In this specification, the skin-facing surface is the surface of the front and back surfaces of each member that constitutes the absorbent article 1, and the surface is arranged on the wearer's skin side when worn. Of the front and back surfaces of each member constituting the article 1, it is the surface facing away from the wearer's skin when the article is worn. In the following description, the upper side shown in FIGS. 1 to 4 is the skin facing side, and the lower side is the non-skin facing side.

As the surface sheet 2, a liquid-permeable sheet such as a nonwoven fabric or a perforated film can be used. The surface sheet may have an uneven surface on the side facing the skin. For example, a plurality of projections can be formed in a scattered pattern on the side of the surface facing the skin of the topsheet. Alternatively, ridges and grooves extending in one direction may be alternately formed on the surface of the topsheet facing the skin. For such purposes, two or more nonwoven fabrics may be used to form the topsheet.

As the backsheet 3, for example, a liquid-impermeable film, a spunbond/meltblown/spunbond laminated nonwoven fabric, or the like can be used. A plurality of micropores may be provided in the liquid-impermeable film to impart water vapor permeability to the film. In addition to this, a sheet having good texture such as a non-woven fabric may be laminated on the outer surface of the back sheet.

The absorbent body 4 includes an absorbent core 41 containing a water-absorbing polymer and hydrophilic fibers, and a core wrap sheet 42 covering the absorbent core 41 . At least the skin facing surface of the absorbent core 41 is covered with a liquid-permeable core wrap sheet 42, and the entire surface including the skin facing surface and the non-skin facing surface is covered with the core wrap sheet 42. good. In the embodiment shown in FIG. 1 , the core wrap sheet 42 covers the entire surface of the absorbent core 41 including the skin-facing surface and the non-skin-facing surface.

Describing the structure of the absorbent body 4 in detail, as shown in FIG. The polymerized deodorant material 5 refers to a material having a function of polymerizing a phenolic compound, and polymerizes a phenolic compound such as phenol or cresol contained in the liquid absorbed by the absorbent article 1, particularly urine, into a polymer. It reduces the volatilization amount of the phenolic compound volatilized from the urine absorbed by the absorbent body 4 . It is preferable that the polymerized deodorizing material 5 act on at least cresol, which is a representative example of phenolic compounds contained in urine, to reduce the amount of volatilization.

The polymerized deodorant material 5 has the action of oxidizing the above-described phenolic compound to form an oxide, polymerizing the oxide and the phenolic compound to polymerize them, or polymerizing the oxides to polymerize them. It is more preferable to have at least one of the effects of In the following description, polymerization of a phenolic compound by oxidation and polymerization is also referred to as "oxidation polymerization". Examples of such a polymerized deodorizing material 5 include enzymes and catalysts having an oxidative polymerization action. From the viewpoint of improving deodorizing properties, it is more preferable to use at least one of these, and it is even more preferable to use them together.

Phenol oxidase such as laccase and tyrosinase is preferably used as the enzyme having an oxidative polymerization action, and laccase is more preferably used from the viewpoint of enhancing the deodorant effect by oxidatively polymerizing phenolic compounds derived from urine.

As the catalyst having an oxidative polymerization action, copper complexes such as copper/pyridine complexes and copper/amine complexes, and metal complexes such as iron complexes such as iron/Schiff base complexes are preferably used. A metal complex is a compound in which a metal or metal ion is present in the center of the molecule, and ligands having a lone pair of electrons surround the metal or metal ion. Examples of ligands include amines, polyamines, Schiff bases, halogen ions, hydroxy ions, and combinations thereof.

In the absorbent article 1 shown in FIG. 1 , a liquid-permeable sheet 6 different from the core wrap sheet 42 is placed between the polymerized deodorant material 5 and the absorbent core 41 at least on the skin-facing side of the absorbent body 4 . are distributed. The liquid-permeable sheet 6 separates the polymerized deodorant material 5 and the absorbent core 41 to prevent physical contact between these members.

The liquid-permeable sheet 6 is a liquid-permeable and air-permeable sheet. The liquid-permeable sheet 6 may have a single-ply structure consisting of a single sheet regardless of whether it is a single layer or multiple layers, or may have a multi-ply structure in which a plurality of sheets regardless of whether they are single layers or multiple layers are stacked. There may be. In the embodiment shown in FIG. 1, the liquid-permeable sheet 6 is shown as a single-ply structure consisting of a single layer and one sheet.

As the liquid-permeable sheet 6, for example, various nonwoven fabrics such as spunbond nonwoven fabrics, air-through nonwoven fabrics, air-laid nonwoven fabrics, spunlace nonwoven fabrics, and meltblown nonwoven fabrics can be used. The liquid-permeable sheet 6 may have openings or slits as long as physical contact between the polymerized deodorizing material 5 and the absorbent core 41 is prevented.

As shown in FIG. 1, when the polymerized deodorant material 5 is placed only on the skin-facing side of the absorbent body 4, the content of the polymerized deodorant material 5 is expressed in basis weight from the viewpoint of improving the deodorizing property. is preferably 0.05 g/m ² or more, more preferably 0.1 g/m ² or more, and preferably 5 g/m ² or less, and 1 g/m ² or less. is more preferred. When the polymerized deodorant material 5 is applied to the side surface of the absorbent body and the non-skin-facing surface in addition to the skin-facing surface of the absorbent body 4, the total amount of the polymerized deodorant material 5 is within the content range described above. The amount of the polymerized deodorizing material 5 placed on each surface of the absorbent body may be appropriately adjusted so as to

As the water-absorbent polymer contained in the absorbent core 41, a polymer capable of absorbing and retaining liquid of 20 times or more of its own weight and gelling is preferable. For example, starch, crosslinked carboxymethylated cellulose, acrylic acid or alkali metal acrylate Examples include polyacrylic acid and its salts and polyacrylate graft polymers, such as salt polymers or copolymers. The particle size of the water-absorbing polymer is preferably 1 μm or more and 1000 μm or less. The shape of the water-absorbent polymer can be spherical, blocky, grape-like, powdery or fibrous.

Examples of hydrophilic fibers contained in the absorbent core 41 include fibers such as cellulose such as pulp. As the core wrap sheet 42, a liquid-permeable sheet can be used. For example, a thin paper made of hydrophilic fibers or a liquid-permeable nonwoven fabric can be used.

In addition to the above-described topsheet, backsheet, and absorbent body, leak-proofing layers extending along the longitudinal direction are provided on both sides along the lengthwise direction of the skin-facing surface of the absorbent article, depending on the specific use of the absorbent article. A cuff may be provided. A leak-tight cuff generally has a proximal end and a free end. The leak-proof cuff has a base end on the skin-facing side of the absorbent article and stands up from the skin-facing side. The leak-tight cuff is constructed from a liquid-resistant or water-repellent and breathable material. An elastic member made of rubber thread or the like may be arranged in a stretched state at or near the free end of the leak-proof cuff. When the absorbent article is worn, the contraction of the elastic member causes the leakage-preventing cuff to stand up toward the wearer's body, and the liquid excreted on the topsheet flows along the topsheet and becomes absorbent. Leakage to the outside in the width direction of the article is effectively prevented.

The absorbent article may further have an adhesive layer on the surface of the non-skin facing surface. The adhesive layer is used to secure the absorbent article to underwear or another absorbent article.

According to the absorbent article 1 having the above configuration, the polymerized deodorizing material 5 is arranged at least on the side facing the skin of the absorbent body 4, so that the phenolic compound, which is a malodorous component contained in excrement such as urine, is used. is oxidized and polymerized to make the offensive odor caused by the phenolic compound volatilized from the urine absorbed by the absorbent 4 difficult to perceive. As a result, it is possible to effectively deodorize odors caused by excrement, particularly odors caused by urine. In addition to this, by disposing the liquid-permeable sheet 6 between the polymerized deodorant material 5 and the absorbent core 41, the polymerized deodorant material 5 and excrement components other than phenolic compounds in the absorbent body 4 are removed. It is possible to suppress the unintended oxidative polymerization reaction with and prevent the discoloration of the excrement absorbed by the absorbent body 4, especially the discoloration of the urine absorbed by the absorbent body. As a result, it is possible to improve the appearance of the absorbent article after absorbing excrement. Further, by arranging the liquid-permeable sheet 6 on the side of the absorbent body facing the skin, urine absorbed in the absorbent body 4 is less likely to return.

Since the liquid-permeable sheet 6 used in the present invention has air permeability, the affinity between the polymerized deodorant material 5 and oxygen in the air necessary for oxidation is increased, and the volatilized phenolic compound is polymerized. Polymerization by the deodorant material 5 can be favorably progressed. As a result, there is also the advantage that the offensive odor from the excrement can be effectively deodorized.

Another embodiment different from FIG. 1 is the embodiment shown in FIG. In the absorbent article of this embodiment, the polymerized deodorant material 5 is arranged on both the skin-facing side and the non-skin-facing side of the absorbent body 4 . Along with this, one liquid-permeable sheet 6 is arranged so as to cover the entire surface including the skin-facing surface and the non-skin-facing surface of the absorbent core 41 in the absorbent body 4, and the sheet 6 polymerizes. The deodorizing material 5 and the absorbent core 41 are separated. With such a configuration, the entire absorbent body 4 can be covered while isolating the polymerized deodorant material 5 and the absorbent core 41, thereby reducing the appearance of the absorbent article due to discoloration of the absorbent body. In addition, it is possible to more effectively deodorize odors from excrements such as urine, and to prevent unintended leakage of malodors. The content of the polymerized deodorant material 5 in the present embodiment may be appropriately adjusted so that the total amount of the polymerized deodorant material 5 is within the above-described content range.

As described above, the liquid-permeable sheet 6 may have a single-ply structure consisting of one sheet, or may have a multi-ply structure in which a plurality of sheets are laminated. The liquid permeable sheet 6 shown in FIG. 1 has a single-ply structure consisting of a single sheet, but instead of this, the liquid-permeable sheet 6 has a single-ply structure consisting of multiple layers. Alternatively, the liquid-permeable sheet 6 may have a multi-ply structure in which a plurality of sheets, whether single-layered or multi-layered, are laminated.

Specifically, the absorbent article 1 shown in FIG. A multilayer sheet having a thickness direction Z is arranged, and the surface of the liquid permeable sheet 6 on the second fiber layer 62 side is arranged to face the skin-facing surface of the absorbent core 41 . The second fiber layer 62 in the liquid permeable sheet 6 is preferably a fiber layer having a larger inter-fiber distance than the first fiber layer 61 . That is, it is preferable that the first fiber layer 61 has a relatively dense structure and the second fiber layer 62 has a relatively bulky structure. When using the liquid-permeable sheet 6 having a single-ply structure, for example, a multi-layered single liquid-permeable sheet 6 having a first fiber layer 61 and a second fiber layer 62 may be used, and a multi-ply structure When using the liquid-permeable sheet 6 having can be When at least one of the first fiber sheet and the second fiber sheet has a multilayer structure, the entire first fiber sheet may satisfy the physical properties of the first fiber layer 61 described later. It is sufficient that the physical properties of the second fiber layer 62, which will be described later, are satisfied. By having such a structure, liquid excretion such as urine is diffused in the sheet surface direction by the first fiber layer having a dense structure, and contact efficiency between the liquid excrement and the polymerized deodorant material 5 is increased. is enhanced to further enhance the deodorant effect, and the absorbent core 41 can quickly absorb liquid excrement. In addition to this, the second fiber layer 62 having a bulky structure prevents contact between the polymerized deodorizing material 5 and the excrement absorbed by the absorbent core 41 to prevent discoloration, and the liquid-permeable sheet 6 It is possible to enhance the air permeability of the foam, promote the oxidation polymerization reaction, and enhance the deodorizing effect against the odor derived from the phenolic compound.

In order to make the inter-fiber distance between the first fiber layer 61 and the second fiber layer 62 different from each other, the fiber diameter of the constituent fibers of each layer is made different, the rigidity of the constituent fibers of each layer is made different, or the configuration A crimped fiber may be used as the fiber, the thickness of the fiber layer may be different, or a fiber layer subjected to bulk recovery treatment may be used. Specifically, the fiber diameter of the constituent fibers of the second fiber layer 62 is made larger than the fiber diameter of the constituent fibers of the first fiber layer 61, or the rigidity of the constituent fibers of the second fiber layer 62 is set to that of the first fiber layer 61. The rigidity of the constituent fibers may be higher than that of the constituent fibers, or the constituent fibers of the second fiber layer 62 may be crimped fibers, and the constituent fibers of the first fiber layer 61 may be non-crimped fibers, or the degree of crimping may be higher than that of the second fiber layer. 62, the thickness of the second fiber layer 62 is made thicker than the thickness of the first fiber layer 61, or the second fiber layer 62 is subjected to bulk recovery treatment such as hot air treatment. Layers can be used.

The inter-fiber distance of the first fiber layer 61 is preferably 1 μm or more, more preferably 10 μm or more, preferably 500 μm or less, and more preferably 300 μm or less. Further, the inter-fiber distance of the second fiber layer 62 is preferably 1 μm or more, more preferably 10 μm or more, and 500 μm or less, provided that the inter-fiber distance of the first fiber layer 61 is larger. It is preferably 300 μm or less, more preferably 300 μm or less.

From the viewpoint of achieving both an improvement in the deodorizing effect by promoting the oxidative polymerization reaction and suppressing deterioration of the appearance of the absorbent article due to discoloration, the liquid-permeable sheet 6 described above is a single layer or a multilayer, Alternatively, the inter-fiber distance is preferably larger than that of the core wrap sheet 42, regardless of whether it is single-ply or multi-ply. Specifically, the inter-fiber distance of the entire liquid-permeable sheet 6 is preferably 1 μm or more, more preferably 10 μm or more, preferably 500 μm or less, and more preferably 300 μm or less. . Further, the inter-fiber distance of the core wrap sheet 42 is preferably 1 μm or more, more preferably 10 μm or more, and 500 μm or less, provided that it is smaller than the inter-fiber distance of the liquid-permeable sheet 6. , and more preferably 300 μm or less.

The inter-fiber distance described above can be determined by the following formula (1) based on Wrotnowski's assumption. The formula based on Wrotnowski's assumption is generally used when determining the inter-fiber distance of fibers constituting a fiber assembly such as a non-woven fabric. The inter-fiber distance A (μm) is determined by the thickness h (mm) of the measurement sample, the basis weight e (g/m ² ) of the measurement sample, and the weight of the fibers constituting the measurement sample when the fiber layer or sheet is used as the measurement sample. It is calculated from the fiber diameter d (μm) and the fiber density ρ (g/cm ³ ) of the measurement sample. The thickness h is a value measured with a laser displacement meter by applying a load of 0.5 g/cm ² to the measurement sample. The basis weight e is calculated by measuring the mass of a measurement sample cut into a predetermined size, for example, a rectangular shape of 0.12 m×0.06 m in plan view, and dividing the area of the measurement sample from the mass. The fiber diameter d is measured using a scanning electron microscope (manufactured by Seiko Instruments Inc., DSC6200) and measuring the diameter of the fiber cross section cut in the direction perpendicular to the length direction of 10 fibers. The arithmetic mean value of these diameters when The fiber density ρ is the average value of the densities calculated from the density and the composition ratio of the raw resin when the type and composition ratio of the raw material resin constituting the fiber are known, and the fiber density ρ is If the type of raw material resin constituting the material and its composition ratio are not known, the value measured according to the density gradient tube method described in JIS L1015 using a density gradient tube is used as the fiber density ρ. do.
It can be obtained by dividing the mass of the measurement sample by the product of the area and thickness of the measurement sample.
Inter-fiber distance A = [{d × √ (π × ρ × h × 1000)} / 2 √ e] - d (1)

In the absorbent article 1, the absorbent body 4 preferably contains a porous deodorant. With such a structure, the phenolic compound volatilized from the absorbent core 41 that has absorbed urine is oxidatively polymerized by the polymerized deodorant material 5, and the phenolic compound that could not be polymerized by the polymerized deodorant material 5 is produced. Since odorous components other than phenolic compounds and phenolic compounds are adsorbed by the porous deodorant, a high deodorizing effect on excrement such as urine and a good longevity of the deodorizing effect are achieved.

Examples of porous deodorants include activated carbon, silica gel, porous polymers, porous minerals such as zeolite, and the like, and these can be used singly or in combination. Examples of porous polymers include porous polystyrene, porous polysubstituted styrene, porous styrene copolymer, porous substituted styrene copolymer, porous polyethylene terephthalate, porous polybutylene terephthalate, porous 2,6-diphenyl-p-phenylene oxide. Polymers, copolymers of crosslinkable vinyl monomers and other monomers, and the like can be used. Substituted styrene means styrene in which ortho-position, meta-position, para-position or a combination thereof is substituted with functional groups such as methyl groups and halogens at 1 to 5 sites.

A crosslinkable vinyl monomer is a monomer having two or more vinyl groups. Examples of the crosslinkable vinyl monomer include divinylbenzene, trivinylbenzene, ethylene glycol di(meth)acrylate, etc., and divinylbenzene is preferred. Deodorant particles with a larger specific surface area can be obtained as the ratio of the crosslinkable vinyl monomer in the monomer component is larger. Therefore, the proportion of the crosslinkable vinyl monomer in the total monomer components is preferably 5% by mass or more, more preferably 20% by mass or more, still more preferably 50% by mass or more, and preferably 100% by mass or less, and 95% by mass. More preferred are:

Other monomers to be polymerized with the crosslinkable vinyl monomer include, for example, aromatic vinyl monomers, unsaturated acid esters, unsaturated acids, and vinyl monomers having a heteroaromatic ring. Examples of aromatic vinyl monomers include styrene, α-methylstyrene, vinyltoluene, ethylvinylbenzene, and vinylbenzyl chloride. Examples of unsaturated acid esters include (meth)acrylic acid, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, Cyclohexyl (meth)acrylate, benzyl (meth)acrylate, glycidyl (meth)acrylate and the like can be mentioned. Unsaturated acids include (meth)acrylic acid. Vinyl monomers having a heteroaromatic ring include 2-vinylpyridine, 4-vinylpyridine, 1-vinylimidazole, 2-vinylpyrimidine and the like. As used herein, (meth)acrylate means acrylate or methacrylate, and (meth)acrylic acid means acrylic acid or methacrylic acid.

When the absorbent body 4 contains a porous deodorant, it is preferable that the polymerized deodorant material 5 is arranged between the porous deodorant 8 and the absorbent core 41 as shown in FIG. In other words, it is preferable that the porous deodorant 8 is arranged outside the polymerized deodorant material 5 in the thickness direction. For example, as shown in FIG. 4, the porous deodorant 8 can be held in the core wrap sheet 42, or can be spread or applied on the skin-facing surface or the non-skin facing surface of the core wrap sheet 42 to adhere to it. can be done. As a method for holding the porous deodorant 8 in the core wrap sheet 42, for example, there is a method of making paper from a mixed slurry of fibrous material, which is the raw material of the core wrap sheet 42, and the porous deodorant. With this arrangement, the phenolic compound volatilized from the absorbent core 41 that has absorbed urine is oxidatively polymerized by the polymerized deodorant material 5, and the phenolic compound that could not be polymerized by the polymerized deodorant material 5 is removed. Odor components other than compounds and phenolic compounds are adsorbed by the porous deodorant located outside the polymerized deodorant material 5 in the thickness direction, so that the deodorant durability of the porous deodorant is enhanced. As a result, an absorbent article having an excellent deodorizing effect on excrement such as urine and excellent deodorizing durability is obtained.

The content of the porous deodorant 8 is preferably 0.1 g/m ² or more, more preferably 0.5 g/m ² or more, and 10 g/m ² in terms of basis weight. It is preferably 5 g/m ² or less, more preferably 5 g/m 2 or less.

From the viewpoint of preventing putrefaction of excrement such as urine and preventing an increase in odor, the absorbent preferably contains an antibacterial agent. The position where the antibacterial agent is placed is not particularly limited, but from the viewpoint of preventing rot in the vicinity of the water-absorbing polymer where moisture tends to accumulate and imparting a long-term and sustained antibacterial effect, the antibacterial agent is added to the water-absorbing polymer. preferably included. A method for incorporating an antibacterial agent into the water-absorbing polymer includes, for example, a method of adhering antibacterial fine particles to the surface of the water-absorbing polymer described in JP-A-2016-104119.

As the antibacterial agent, an agent capable of suppressing the growth of microorganisms that produce β-glucuronidase, which is one of the factors that increase urine odor, is preferably used. Examples of such antibacterial agents include hydroxamic acid derivatives such as piroctone olamine (also known as piroctone ethanolamine); pyridonecarboxylic acid derivatives such as pyromidic acid, pipemidic acid and cinoxacin; and quaternary ammonium cetyl phosphate such as benzalkonium. compounds, etc., and these can be used alone or in combination of two or more.

The content of the antibacterial agent is preferably 50 ppm or more, more preferably 200 ppm or more, preferably 5000 ppm or less, and still more preferably 3500 ppm or less, relative to the weight of the water-absorbent polymer. For example, when piroctone olamine is used as an antibacterial agent and the antibacterial agent is attached to the surface of the water-absorbent polymer, the content of the antibacterial agent is preferably 200 ppm or more with respect to the weight of the water-absorbent polymer. It is more preferably 500 ppm or more, preferably 2000 ppm or less, and even more preferably 1000 ppm or less.

Although the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. For example, the liquid-permeable sheet 6 may be arranged only on the skin-facing surface side and the non-skin-facing surface side of the absorbent core 41 , and may not be arranged on both side surfaces of the absorbent core 41 .

EXAMPLES The present invention will be described in more detail below with reference to examples. However, the scope of the invention is not limited to such examples.

[Example 1]
An absorbent core 41 containing hydrophilic fibers and a water-absorbing polymer is covered with a core wrap sheet 42 to have dimensions of 50 mm x 100 mm. 8 and the antibacterial agent were prepared. Polymerized deodorizing material 5 was placed between absorbent core 41 and core wrap sheet 42 on the skin facing side of absorbent body 4 . On the skin-facing side of the absorbent body 4, a multi-ply nonwoven fabric having an interfiber distance of 38 μm as the first fiber layer 61 and an air-through nonwoven fabric having an interfiber distance of 89 μm as the second fiber layer 62 are laminated. A liquid-permeable sheet 6 made of a multi-layered sheet was arranged between the polymerized deodorant material 5 and the absorbent core 41 to isolate these members. Polymerized deodorant material 5 and porous deodorant 8 were the compounds shown in Table 1 below in the amounts shown in the same table. The porous deodorant 8 was retained within the core wrap sheet. Also, the antibacterial agent was adhered to the surface of the water-absorbent polymer at the content shown in Table 1 below.

[Example 2]
The liquid-permeable sheet 6 is a single-layer, single-ply sheet made of an air-through nonwoven fabric with an inter-fiber distance of 89 μm, and the porous deodorant 8 and the antibacterial agent are used at the contents shown in Table 1 below. produced an absorbent body 4 in the same manner as in Example 1.

[Examples 3 to 5]
An absorbent body 4 was produced in the same manner as in Example 1 except that the compounds shown in Table 1 below were used as the porous deodorant 8 and the antibacterial agent in the amounts shown in the same table.

[Comparative Example 1]
An absorbent body was used in which an absorbent core 41 containing hydrophilic fibers and a water-absorbent polymer was covered with a core wrap sheet 42 . The absorber of this comparative example did not contain the polymeric deodorant material 5, the liquid-permeable sheet 6, the porous deodorant 8, and the antibacterial agent.

[Comparative Example 2]
An absorbent core 41 containing hydrophilic fibers and a water-absorbent polymer was covered with a core wrap sheet 42 in which a porous deodorant 8 shown in Table 1 below was retained in the sheet at the content shown in the same table. , an absorbent body was produced in the same manner as in Comparative Example 1. The absorber of this comparative example did not contain the polymerized deodorizing material 5, the liquid-permeable sheet 6 and the antibacterial agent.

[Comparative Example 3]
An absorbent body was produced in the same manner as in Comparative Example 1 except that an absorbent core 41 containing hydrophilic fibers and a water-absorbing polymer containing the polymerized deodorizing material 5 was covered with a core wrap sheet 42 . Polymerized deodorant material 5 was obtained by incorporating the compounds shown in Table 1 below into the water-absorbing polymer in the amounts shown in the same table. The absorber of this comparative example did not contain the liquid-permeable sheet 6, the porous deodorant 8 and the antibacterial agent.

[Comparative Example 4]
An absorbent body was produced in the same manner as in Comparative Example 1, except that an absorbent core 41 containing hydrophilic fibers and a water absorbent polymer to which an antibacterial agent was attached was covered with a core wrap sheet 42 . As the antibacterial agent, the compound shown in Table 1 below was adhered to the surface of the water-absorbent polymer at the content shown in the same table. The absorber of this comparative example did not contain the polymerized deodorant material 5, the liquid-permeable sheet 6 and the porous deodorant 8.

[Comparative Example 5]
An absorbent core 41 containing hydrophilic fibers and a water-absorbent polymer is covered with a core wrap sheet 42 and has dimensions of 50 mm x 100 mm and contains a polymerized deodorant material 5, a porous deodorant 8 and an antibacterial agent. An absorber was produced. The comparative example of this comparative example did not include the liquid-permeable sheet 6 . Polymerized deodorant material 5 was obtained by incorporating the compounds shown in Table 1 below into the water-absorbing polymer in the amounts shown in the same table. For the porous deodorant 8, the compounds shown in Table 1 below were retained in the core wrap sheet 42 at the contents shown in the same table. As the antibacterial agent, the compound shown in Table 1 below was adhered to the surface of the water-absorbent polymer at the content shown in the same table.

[Comparative Example 6]
An absorbent core 41 containing hydrophilic fibers and a water-absorbing polymer is covered with a core wrap sheet 42 to have dimensions of 50 mm x 100 mm. 8 and the antibacterial agent were prepared. The polymerized deodorizing material 5 contains the compounds shown in Table 1 below and is placed between the liquid-permeable sheet 6 and the absorbent core 41 in the amounts shown in the same table. As the liquid-permeable sheet 6, a single-layer single sheet having an inter-fiber distance of 89 μm was used. For the porous deodorant 8, the compounds shown in Table 1 below were retained in the core wrap sheet 42 at the contents shown in the same table. As the antibacterial agent, the compound shown in Table 1 below was adhered to the surface of the water-absorbent polymer at the content shown in the same table.

[Evaluation of urine odor]
The absorbers of Examples and Comparative Examples and 10 mL of human urine were placed in a weighing bottle of 50 mmφ, mixed, and allowed to stand for 30 minutes or 12 hours to obtain a sample. The urine odor of this sample was evaluated by five professional monitors according to the following evaluation criteria, and the arithmetic mean was taken as the urine odor sensory value. The results are shown in Table 1 below. The lower the urine odor sensory value, the higher the deodorant performance, and it was judged that the deodorant performance was sufficiently exhibited when the sensory value was less than 2.0.

[Evaluation criteria for urine odor]
4: Strong urine odor 3.5: Slightly strong urine odor 3: Odor distinguishable from urine odor 2.5: Slightly weak urine odor 2: Weak urine odor 1.5: Very weak urine odor 1: Slightly indistinguishable urine odor Odor 0.5: Very slight odor that cannot be identified as urine odor 0: No odor

[Evaluation of discoloration]
The degree of discoloration of the sample prepared in the above [Evaluation of urine odor] after standing for 12 hours was visually evaluated according to the following criteria. The results are shown in Table 1 below.

[Evaluation criteria for discoloration]
◯: The absorber did not change color before and after mixing human urine, and had a good appearance.
Δ: Absorbent slightly discolored after mixing with human urine, but acceptable appearance.
x: Absorber discolored after mixing with human urine, resulting in poor appearance.

Materials used in Examples and Comparative Examples are shown below. The amount of laccase shown in Table 1 is the amount of starch added. In Table 1, the liquid-permeable sheet 6 is also written as "BrS". In Table 1, "-" indicates not used.

・Hydrophilic fiber: fluff pulp, trade name “NB416”, manufactured by Weyerhaeuser ・Water absorbing polymer: trade name “Aqualic CA” manufactured by Nippon Shokubai Co., Ltd. ・Divinylbenzene/methacrylic acid: Divinylbenzene and methacrylic acid are monomers Porous copolymer obtained by copolymerization as a component (monomer ratio: divinylbenzene 95%, methacrylic acid 5%)
Divinylbenzene/vinylpyridine: a porous copolymer obtained by copolymerizing divinylbenzene and vinylpyridine as monomer components (monomer ratio: divinylbenzene 75%, vinylpyridine 25%)
・Divinylbenzene/Styrene: Product name “DIAION HP20SS”, manufactured by Mitsubishi Chemical Corporation ・Laccase: Product name “Laccase Ml20” (starch additive), manufactured by Amano Enzyme Co., Ltd. ・Piroctone Olamine: Product name “Octopirox” , made by Clariant

As shown in Table 1, Examples 1 to 5, in which the liquid-permeable sheet 6 is arranged so as to separate the polymerized deodorant material and the absorbent core 41, either do not contain the polymerized deodorant material or do not contain the polymerized deodorant material. Compared to Comparative Examples 1 to 6 in which the odorant material was placed on the liquid-permeable sheet 6 at a portion other than the skin facing side, the perceived urine odor was reduced to the same level or less, and the deodorizing property was high. Moreover, it turns out that the sustainability is also high. Further, when comparing Examples 1 to 5 with Comparative Examples 3, 5 and 6 containing the polymerized deodorizing material, it is found that no discoloration occurs even after absorption of urine. Therefore, the absorbent article of the present invention can effectively deodorize odors caused by excrement such as urine, and has a good appearance even after absorption of excrement such as urine.

REFERENCE SIGNS LIST 1 absorbent article 2 top sheet 3 back sheet 4 absorbent 41 absorbent core 42 core wrap sheet 5 material having a function of polymerizing a phenolic compound (polymerized deodorizing material)
6 liquid permeable sheet 61 first fiber layer 62 second fiber layer 8 porous deodorant

Claims (4)

An absorbent body having an absorbent core containing a water-absorbent polymer and hydrophilic fibers and a core wrap sheet covering the absorbent core,
A polymerized deodorizing material is arranged between the absorbent core and the core wrap sheet on the side facing the skin of the absorbent body, and a liquid-permeable sheet is provided between the polymerized deodorant material and the absorbent core. is arranged to separate the polymerized deodorant material and the absorbent core,
The liquid-permeable sheet is a multilayer sheet having a first fiber layer and a second fiber layer having a larger inter-fiber distance than the first fiber layer in the thickness direction,
The absorbent article, wherein the surface of the liquid-permeable sheet on the side of the second fiber layer faces the skin-facing surface of the absorbent core. 2. The absorbent article of claim 1 , wherein said absorbent body comprises a porous deodorant. 3. The absorbent article according to claim 2 , wherein said polymeric deodorant material is disposed between said porous deodorant and said absorbent core. 4. The absorbent article according to any one of claims 1 to 3 , wherein said absorbent body comprises an antimicrobial agent.

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