absorbent materials

Abstract

The present invention relates to an absorbent article comprising a front sheet 1, a back sheet 2, and an absorbent body 3 between the two sheets. The absorbent body 3 includes an absorbent sheet containing fibrous material as a constituent component. The absorbent article has a longitudinal direction Y corresponding to the front-back direction of the wearer and a transverse direction X orthogonal to the longitudinal direction Y. The absorbent body 3 has a laminated structure at least in the central portion of the transverse direction X of the absorbent body 3. The laminated structure includes a front absorbent sheet 31 located on the skin-facing side 10A, a back absorbent sheet 32 ​​located on the non-skin-facing side 10B, and a central absorbent portion 33 located between the two sheets. The central absorbent portion 33 contains a water-soluble antibacterial agent, a porous material, and a polyphenol compound.

Description

absorbent materials This invention relates to an absorbent item such as a menstrual sanitary napkin, incontinence pad, or diaper. Menstrual blood or urine are odorless immediately after being excreted, but due to bacterial action, they decompose over time, producing substances that cause foul odors. Various substances can cause foul odors, including trimethylamine, which readily emits an unpleasant smell. Previously known techniques include containing antibacterial agents in absorbent products such as menstrual sanitary napkins (e.g., Patent Documents 1-4). [Prior Art Documents] [Patent Documents] [Patent Document 1] Japanese Patent Application Publication No. 2019-162401 [Patent Document 2] Japanese Patent Application Publication No. 2010-110443 [Patent Document 3] Japanese Patent Application Publication No. 2014-158509 [Patent Document 4] Japanese Patent Application Publication No. 2016-067749 The present invention provides an absorbent article comprising a liquid-permeable front sheet disposed on the skin-facing side, a back sheet disposed on the non-skin-facing side, and an absorbent body between the two sheets. The absorbent body includes an absorbent sheet containing fibrous material as a constituent member, and the absorbent article has a longitudinal direction corresponding to the front-back direction of the wearer and a transverse direction orthogonal to the longitudinal direction. The absorbent body has a laminated structure at least in the central portion of the transverse direction of the absorbent body. The laminated structure includes a front absorbent sheet on the skin-facing side, a back absorbent sheet on the non-skin-facing side, and a central absorbent portion between the two sheets. The central absorbent portion contains a water-soluble antibacterial agent, a porous material, and a polyphenol compound. The above and other features and advantages of the present invention will become more apparent from the accompanying drawings and from the description below. This invention relates to an absorbent material that can suppress skin irritation and continuously suppress odor absorption. The antibacterial effect of antibacterial agents in absorbent products is not visually apparent; therefore, it is generally felt by reducing odor and decreasing skin itching and inflammation caused by bacteria. However, antibacterial agents are generally not effective against all bacteria. Furthermore, if the amount of antibacterial agent is excessively increased to cope with prolonged use of absorbent products, the backflow of excrement towards the skin may cause the antibacterial agent to irritate the skin. Therefore, there is room for further improvement in the odor reduction aspect of absorbent products. In contrast, the absorbent articles of the present invention can suppress skin irritation and continuously suppress odor. Hereinafter, a menstrual sanitary napkin (hereinafter also referred to as a sanitary napkin) 10, which is a preferred embodiment of the absorbent article of the present invention, will be described with reference to the drawings. In the present invention, unless otherwise specified, the side that comes into contact with the human body is referred to as the skin-facing side, and the opposite side is referred to as the non-skin-facing side. These terms, used to indicate the relative positional relationship of the components of the absorbent article, are also used for components that do not have a surface that comes into contact with the human body. Furthermore, the direction in front of the human body when worn is referred to as the front, and the direction in back is referred to as the rear. The normal direction of the front or back of the absorbent article is referred to as the thickness direction. As shown in Figures 1 and 2, the sanitary napkin 10 comprises a liquid-permeable front sheet 1 disposed on the skin-facing side 10A, a back sheet 2 disposed on the non-skin-facing side 10B, and a liquid-retaining absorbent body 3 between the two sheets 1 and 2. The front sheet 1 is liquid-permeable, allowing excrement to be delivered to the absorbent body 3, while the back sheet 2 is leak-proof. The front sheet 1 and the back sheet 2 are sized to cover both sides of the absorbent body 3 and extend outward from the outer edge of the absorbent body 3. Furthermore, the terms "skin-facing side 10A" and "non-skin-facing side 10B" are used not only to indicate the relative arrangement position of the sanitary napkin 10 in the thickness direction, but also to indicate the relative arrangement position of the constituent components of the sanitary napkin 10 in the thickness direction. In this embodiment, a second sheet 4 with a narrower width than the absorbent body 3 and good liquid permeability is provided between the front sheet 1 and the absorbent body 3. The second sheet 4 has the function of spreading the excrement passing through the front sheet 1 in the planar direction, thereby increasing the absorption area of ​​the skin-contact side of the absorbent body 3. Furthermore, side leak-proof sheets 5 are laminated on both sides of the skin-contact side of the front sheet 1. The side leak-proof sheets 5 and the back sheet 2 extend outward in the transverse X direction of the absorbent body 3 to form wings 6 as members for fixing to clothing, etc. On the non-skin-contact side of the wings 6 and the back sheet 2, there are adhesive portions (not shown) for fixing the sanitary napkin 10 to clothing. In the laminated structure of this sheet, the outer periphery of the sanitary napkin 10 becomes an outer peripheral sealing portion 9 that is joined without the absorbent body 3. The sanitary napkin 10 may also include other constituent components, and may also be in a form without the second sheet 4, wings 6, and side leak-proof sheets 5. Furthermore, it may also have leak-proof grooves formed by compression from the front sheet 1 to the absorbent body 3, and multiple embossings on the front sheet 1. In addition, the side leak-proof sheets 5 may retain free ends on the inner side of both sides of the front sheet 1 while being joined with the front sheet 1, and elastic members may be provided at the aforementioned free ends to form leak-proof flanges. The sanitary napkin 10 is elongated when viewed from above, meaning it has a longitudinal direction (Y) corresponding to the wearer's front-to-back direction and a transverse direction (X) orthogonal to this longitudinal direction. Similarly, the front sheet 1, back sheet 2, and absorbent core 3 are also elongated, just like the sanitary napkin 10. The longitudinal direction (Y) corresponds to the direction connecting the sanitary napkin 10 to the wearer's abdomen, groin, and back when worn. The transverse direction (X) corresponds to the direction connecting the wearer's left and right legs under the groin. In this specification, the longitudinal direction (Y) and transverse direction (X) represent the orientation of the sanitary napkin 10 when viewed from above, and also represent the orientation of the front sheet 1, back sheet 2, and absorbent core 3 when viewed from above. The sanitary napkin 10 has a central portion C in the longitudinal direction Y, which includes a portion facing the wearer's excretory point. Furthermore, in the longitudinal direction Y, it has a forward portion F located further forward of the central portion C on the lower abdomen side, and a rearward portion R located further backward of the central portion C on the buttock side. Also, in the central portion C, in the central part of the transverse direction X, there is an excretory-facing area (also called a receiving area) C1 that faces the aforementioned excretory point and directly receives excrement. The "central portion" of the transverse direction X containing the excretory-facing area C1, as shown in Figure 1, refers to a range of a specific width extending left and right from the center line L of the transverse direction X, and refers to the portion further inward than the two end edges of the transverse direction X of the absorbent body 3. Specifically, it refers to the portion extending left and right from the center line L of the transverse direction X of the sanitary napkin 10 and being 40% to 60% of the width of the absorbent body 3. Furthermore, the middle section C, the excretion section opposite area C1, the front section F, and the back section R indicate the divisions within the sanitary napkin 10, and also indicate the corresponding divisions within the front sheet 1, absorbent body 3, and back sheet 2. The positions of the middle portion C, the front portion F, and the rear portion R can be appropriately set according to the length of the absorbent article, which is determined based on its intended use. When the article has wings that bend and secure under the crotch of shorts, the longitudinal region containing these wings becomes the middle portion C. The sanitary napkin 10 of this embodiment is an example of a shape designed for daily use, where the longitudinal length is divided into three equal parts, and the front portion F, middle portion C, and rear portion R are defined accordingly. In the case of a daily-use sanitary napkin without wings, the middle portion is defined in the same way. Regardless of the shape of the sanitary napkin 10, generally, the middle portion C can be positioned at a fixed distance from the front portion F. Furthermore, for adult or infant diapers, or absorbent pads, the longitudinal length is divided into three equal parts, and the front portion F, middle portion C, and rear portion R are defined accordingly. Next, the absorber 3 will be explained. The absorbent body 3 comprises an absorbent sheet as a structural component, which contains a fibrous material. This fibrous material possesses hydrophilicity, capable of absorbing excrement; examples include hydrophilic fibers that are hydrophilicized by hydrophilization treatment of hydrophobic fibers, or fibers that are inherently hydrophilic. Preferably, it is both inherently hydrophilic and possesses water-retention properties. Examples of hydrophilic fibers include natural fibers, cellulose-based regenerated fibers, or semi-synthetic fibers. Examples of water-retention hydrophilic fibers include, in particular, cellulose-based fibers such as wood pulp fibers, rayon fibers, cotton fibers, and cellulose acetate fibers. Cellulose-based fibers can be used alone or in combination of two or more. Examples of pulp used as raw material for cellulose-based fibers include wood pulp such as coniferous kraft pulp or broadleaf kraft pulp, and non-wood pulp such as cotton pulp or straw pulp. As cellulose-based fibers, cross-linked cellulose fibers (pulp fibers) formed by cross-linking cellulose intramolecularly or intermolecularly with a suitable cross-linking agent, or regenerated cellulose fibers such as rayon fibers with increased cellulose crystallinity, can also be used. As absorbent sheets containing the above-mentioned fiber materials, they can also contain cellulose-based fibers and synthetic fibers, such as thermoplastic fibers, or synthetic fibers, such as thermoplastic fibers, instead of cellulose-based fibers. As thermoplastic fibers, single fibers formed using a single synthetic resin such as polyethylene, polypropylene, polyester, or polyurethane, or composite fibers formed using synthetic resins such as composites of two or more of these resins, can also be used. For example, core-sheath type or side-by-side type composite fibers formed using two or more synthetic resins can be used. These synthetic fibers are preferably those that have undergone hydrophilic treatment as described above. The absorbent sheet can be a sheet composed solely of the aforementioned fibrous material, or it can be a sheet in which a highly absorbent polymer material is sandwiched and fixed between two fibrous layers containing the aforementioned fibrous material. The highly absorbent polymer material mentioned here refers to a surface-crosslinked polymer material known as SAP (Super Absorbent Polymer). When forming an absorbent sheet containing the highly absorbent polymer material, the highly absorbent polymer material can be integrated using the adhesive force exhibited by moisture or by additional adhesives such as adhesives or adhesive fibers. For example, paragraphs

[0019] to

[0127] of Japanese Patent No. 2963647 and paragraphs

[0020] to

[0075] of Japanese Patent No. 2955223 can be cited. Its manufacture can be carried out by various commonly used methods, either wet or dry. Because the thickness of the absorbent sheet is limited to less than 3.0 mm and the highly absorbent polymer material is dispersed in the planar direction of the sheet, it is difficult to cause gel blockage and thus has high absorbency. For example, paragraphs

[0019] to

[0131] of Japanese Patent Application Publication No. 8-246395 can be cited. As a highly absorbent polymer material, it is generally used in particulate form, but it can also be fibrous. When using particulate highly absorbent polymers, their shape can be any of spherical, blocky, bag-like, or amorphous. As a highly absorbent polymer material, polymers or copolymers of acrylic acid or alkali metal salts of acrylic acid can generally be used. Examples include polyacrylic acid and its salts, and polymethacrylic acid and its salts. Sodium salts are preferred as polyacrylates or polymethacrylates. Furthermore, copolymers obtained by copolymerizing maleic acid, itaconic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-(meth)acrylylethanesulfonic acid, 2-hydroxyethyl methacrylate, or styrene sulfonic acid with acrylic acid or methacrylic acid can also be used, within the range that does not reduce the performance of the highly absorbent polymer material. As shown in Figure 2, the absorbent body 3 has a front-side absorbent sheet 31 and a back-side absorbent sheet 32 ​​as the aforementioned absorbent sheets. The front-side absorbent sheet 31 and the back-side absorbent sheet 32 ​​have lengths extending from the middle portion C to the front portion F and the rear portion R, forming the external shape of the absorbent body 3. The front-side absorbent sheet 31 and the back-side absorbent sheet 32 ​​can be formed by folding a single absorbent sheet 3A as shown in Figure 2, or they can be formed from different absorbent sheets. In the configuration shown in Figure 2, the portion of the absorbent sheet 3A disposed on the skin-facing side 10A of the absorbent body 3 becomes the front-side absorbent sheet 31, and the portion disposed on the non-skin-facing side 10B of the absorbent body 3 becomes the back-side absorbent sheet 32. Furthermore, the absorbent sheet 3A can be folded in various ways. In the configuration shown in Figure 2, an absorbent sheet 3A extends from the skin-facing side 10A along the transverse X and is rolled to the non-skin-facing side 10B. The two ends of the transverse X of the absorbent sheet 3A are overlapped and joined on the non-skin-facing side 10B. However, the folding configuration is not limited to this. For example, the two ends of the transverse X of the absorbent sheet 3A can be overlapped and joined on the side of the transverse X of the absorbent body 3, or they can be overlapped and joined on the skin-facing side 10A. From the viewpoint of improving the absorbency of the excretory fluid and reducing the chance of contact between the following water-soluble antibacterial agents, porous materials, and polyphenolic compounds and the skin, the configuration in Figure 2, where the two ends of the transverse X of the absorbent sheet 3A are overlapped and joined on the non-skin-facing side 10B, is preferred. The absorbent 3 has a laminated structure at least in the central portion of the transverse X direction. This laminated structure includes a front-side absorbent sheet 31 located on the skin-facing side 10A, a back-side absorbent sheet 32 ​​located on the non-skin-facing side 10B, and a central absorbent portion 33 located between the two sheets. The central absorbent portion 33 is located in the region including the aforementioned excretory portion opposing region C1. A preferred embodiment of the central absorbent portion 33 will be described below. The sanitary napkin 10 contains a water-soluble antibacterial agent, a porous material, and a polyphenolic compound in its central absorbent portion 33. Specifically, the central absorbent portion 33, which contains the most absorbent fluid within the laminated structure of the absorbent body 3 and corresponds to the region C1 opposite the excretory portion, contains the aforementioned water-soluble antibacterial agent, porous material, and polyphenolic compound. Preferably, the water-soluble antibacterial agent, porous material, and polyphenolic compound are mixed and dispersed in the central absorbent portion 33. Because the central absorbent portion 33, located in the region C1 opposite the excretory portion, has the greatest opportunity to come into contact with menstrual blood and other excretory fluids (hereinafter referred to as excretory fluids) within the sanitary napkin 10. Furthermore, the laminated structure of the absorbent body 3 inhibits the migration of the water-soluble antibacterial agent, porous material, and polyphenolic compound from the absorbent body 3 to the outside. In particular, the increased distance between the front sheet and the central absorbent portion 33 due to the layered structure of the absorbent 3 suppresses the backflow of the excrement from the central absorbent portion 33 to the front sheet 1, making it difficult for the water-soluble antibacterial agent dissolved in the excrement to migrate to the front sheet 1. As a result, the water-soluble antibacterial agent, porous material, and polyphenolic compound can maintain stable contact with the excrement for a long time, effectively exhibiting antibacterial and deodorizing effects. Furthermore, the antibacterial effect at the central absorbent portion 33 reduces the opportunity for bacteria to come into contact with the skin, thereby suppressing skin irritation. Moreover, since the migration of the water-soluble antibacterial agent from the inside to the outside of the layered structure of the absorbent 3, as described above, is suppressed, the skin irritation caused by the water-soluble antibacterial agent is also suppressed. In particular, the skin-facing side 10A of the central absorbent portion 33 is covered by other components, namely the front-side absorbent sheet 31, and thus contains interlayer gaps. Therefore, compared with simply increasing the thickness of the absorbent body 3, it has a higher inhibitory effect on the seepage of excrement containing water-soluble antibacterial agents into the skin-facing side 10A. Furthermore, since it is not just water-soluble antibacterial agents, but water-soluble antibacterial agents, porous materials, and polyphenolic compounds that work together to exhibit a higher antibacterial and deodorizing effect, even if the amount of water-soluble antibacterial agent is relatively small, the odor suppression effect is also improved. The synergistic effect of the aforementioned water-soluble antibacterial agent, porous material, and polyphenolic compound will be explained below. First, because the water-soluble antibacterial agent is water-soluble, it can dissolve in the excrement fluid by penetrating into the central absorbent portion 33. Through dissolution, the water-soluble antibacterial agent moves within the central absorbent portion 33 from the initial stage of excretion, thereby exerting an antibacterial effect and inhibiting bacterial growth at various locations within the central absorbent portion 33 where the excrement fluid is present. In this way, the water-soluble antibacterial agent can exert effects such as inhibiting the decomposition of proteins in menstrual blood caused by bacteria, thereby inhibiting the production of odor-causing substances. On the other hand, generally speaking, when an excessive amount of water-soluble antibacterial agent is used to enhance its effectiveness, the risk of some of the water-soluble antibacterial agent migrating from the central absorbent portion 33 to the skin-side components increases when the wearer applies strong external force to the sanitary napkin 10 due to movements, thus increasing the risk of skin irritation. To address this problem, the central absorber 33 of this invention contains polyphenols. Polyphenolic compounds readily react chemically with odor-causing substances such as trimethylamine, converting these substances into non-volatile compounds and thus deodorizing. Therefore, polyphenolic compounds deodorize through chemical bonding, preventing the re-release of odor-causing substances that would otherwise be released after being adsorbed by the porous material. Furthermore, the central absorber 33 of this invention contains a porous material. The porous material provides a reaction field, facilitating the reaction of polyphenolic compounds. Generally, the evaporation rate of odor-causing substances is often faster than the reaction rate between the odor-causing substances and polyphenolic compounds; in such cases, the polyphenolic compounds may not fully exert their deodorizing function. Therefore, in this invention, the porous material temporarily captures odor-causing substances, from which the gradually released odor-causing substances react with the polyphenolic compounds, thereby achieving a more efficient reaction. Porous materials are generally poorly soluble in water, while polyphenols are water-soluble. Therefore, after being absorbed by the excrement, the porous material is surrounded by polyphenols. Furthermore, when hydroxyl groups or similar substances are introduced into the pores of the porous material, making the liquid hydrophilic, the polyphenols can penetrate into the pores and react with the odor-causing substances before they dissipate, which is preferable. In this way, the porous material and polyphenols can compensate for each other's weaknesses to achieve stronger deodorizing performance. By combining the above three components in the central absorption section 33, the growth of odor-causing bacteria is inhibited by a water-soluble antibacterial agent at the initial stage of excretion, thereby cutting off the source of odor. At the initial stage of excrement decomposition, bacteria that cannot be completely captured by the physical adsorption of the porous material are deodorized. For odor-causing substances released over time, the polyphenols are used to make them chemically non-volatile. In this way, the odor components can be suppressed in a multi-faceted and comprehensive manner using the three-segment structure, and the suppression is sustained in the internal structure of the absorber 3, namely the central absorber 33. This helps to suppress skin irritation caused by sanitary napkins and continuously suppress odor. In terms of further enhancing the aforementioned sustained odor suppression effect, it is preferable that the sanitary napkin 10 contains a water-soluble antibacterial agent, a porous material, and a polyphenolic compound throughout the entire area of ​​the central absorbent portion 33 when viewed from above. When these three components are arranged throughout the central absorbent portion 33 in a direction parallel to the sheet surface, the position of these components in the thickness direction of the central absorbent portion 33 can vary depending on the location. The preferred position in the thickness direction will be described below. Therefore, when the sanitary napkin 10 repeatedly receives excrement due to prolonged use, even if the excrement diffuses within the central absorbent portion 33, the contact opportunity between the three components and the excrement can be increased, thereby enabling the aforementioned effect to be exerted over a wider area. Furthermore, in terms of more effectively inhibiting the irritation of the skin by water-soluble antibacterial agents, it is preferable that the absorbent sheet 31 on the front side of the sanitary napkin 10 does not contain water-soluble antibacterial agents. As described above, the combination of water-soluble antibacterial agents, porous materials, and polyphenolic compounds achieves a higher odor-suppressing effect even with a reduced content of the water-soluble antibacterial agent compared to the case containing only the water-soluble antibacterial agent. Therefore, from the viewpoint of further reducing skin irritation, the water-soluble antibacterial agent in the central absorbent portion 33 is preferably present at a basis weight of 5.0 g / m³. 2 The preferred value is 3.0 g / m³. 2 The following is preferred: 1.0 g / m 2 Furthermore, from the viewpoint of maintaining antibacterial activity, the water-soluble antibacterial agent in the central absorbent portion 33 preferably contains a basis weight of 0.003 g / m³. 2 The above is preferred to be 0.005 g / m 2 The above, and preferably 0.010 g / m 2 That concludes the discussion. From the perspective of further improving the adsorption of odor-causing substances, the preferred basis weight of the porous material in the central absorber 33 is 0.5 g / m³. 2 The above is preferred to be 1.0 g / m 2 That's all. Furthermore, from the viewpoint of maintaining the absorption performance of the central absorber 33, the basis weight of the porous material in the central absorber 33 is preferably 10 g / m³. 2 The preferred value is 5.0 g / m³. 2 From the viewpoint of further enhancing the chemical binding effect on substances causing odor, the preferred content of polyphenolic compounds in the central absorber 33 is 0.001 g / m³. 2 The above is preferred to be 0.003 g / m 2 The above, and preferably 0.005 g / m 2 That's all. Furthermore, from the viewpoint of maintaining the absorption performance of absorber 3, the preferred content of polyphenolic compounds in the central absorber 33 is 5.0 g / m³. 2 The preferred value is 3.0 g / m³. 2 The following is preferred: 1.0 g / m 2 the following. Furthermore, from the viewpoint of more effectively inhibiting the irritation of the skin by water-soluble antibacterial agents and more effectively demonstrating the aforementioned effects of the combination of water-soluble antibacterial agents, porous materials, and polyphenolic compounds, the proportion of the water-soluble antibacterial agent in the central absorbent portion 33 to the proportion of the water-soluble antibacterial agent in the sanitary napkin 10 is preferably 80% or more, more preferably 90% or more, and even more preferably 100%. The term "water-soluble" for a water-soluble antibacterial agent refers to a solubility of 2 g or more in 1 L of ion-exchanged water at 25°C. From the viewpoint of improving the solubility and mobility of the water-soluble antibacterial agent in excrement, the aforementioned solubility is preferably 3 g or more, and more preferably 10 g or more. This solubility can be determined by the following method: 1 L of ion-exchanged water at 25°C is placed in a 2 L beaker, and the thoroughly dried test subject (water-soluble antibacterial agent) is added. Then, a stir bar (e.g., HPS-100 manufactured by AS ONE Co., Ltd.) with a length of 20 mm and a width of 7 mm is attached, and the mixture is stirred at 600 rpm using a magnetic stirrer. The amount added before the agent remains insoluble after 1 hour of stirring is defined as the solubility of the antibacterial agent in water at 25°C. As water-soluble antibacterial agents, various agents that exhibit both solubility and mobility in excrement and exert antibacterial effects can be used. Examples include antibacterial metals, antibacterial metal supports, and organic antibacterial agents. Water-soluble antibacterial metal supports mean that even if the carrier supporting the antibacterial metal is poorly soluble in water, the supported metal is still water-soluble. Specific examples include silver-loaded silicon oxide and silver-loaded zeolite. Organic antibacterial agents have a relatively low or moderate total carbon chain number (4 to 20 carbons). It is preferable to select cationic structures with water-soluble counterions or nonionic structures as water-soluble antibacterial agents. Specific examples include quaternary ammonium salts and alkylpyridinium chlorides having the above structures. Quaternary ammonium salts are preferred. Among quaternary ammonium salts, those with higher affinity for bacteria, such as chlorobenzidine, algicidal amine, and chlorocetylpyridine, have the above structures. As a porous material, any material commonly used in such articles can be used as long as it has pores capable of capturing odor-causing substances, preferably porous particles. Among these, those with deodorizing properties (hereinafter referred to as porous deodorants) are preferred because a certain deodorizing effect can be expected even before the odor-causing substances react with polyphenols, and especially preferred are porous deodorizing particles. Furthermore, porous materials are preferably loaded with antibacterial metals. Porous particles as porous materials refer to particles that have at least multiple pores on their surface and are capable of capturing, adsorbing, and / or agglomerating volatile odor-causing substances into their pores. Examples of materials for porous particles include organic compounds, inorganic compounds, polymers thereof, or combinations thereof. Specific examples include porous polymers synthesized from porous methacrylic acid polymers, porous acrylic acid polymers and other acrylic polymers, porous divinylbenzene polymers, porous pyridine copolymers and other aromatic polymers, and copolymers thereof; natural porous polymers such as chitin and chitosan; and metal-supported porous materials such as zinc oxide, activated carbon, silica, silica (silica gel), calcium silicate, aluminosilicate compounds, high-silica zeolite (hydrophobic zeolite), sepiolite, nepheline, zeolite, and hydrated zirconium oxide, preferably containing at least one of the groups selected from the above. The odor components from excrement such as urine or menstrual blood, which are the targets of deodorization, are a mixture of multiple components such as ammonia, amines, fatty acids, hydrogen sulfide, or thiols. Generally speaking, the molecular size of these odor components is 1 nm or larger. Therefore, by using porous particles with an average pore size of 2 nm or larger as deodorants, multiple odor components can be effectively adsorbed. The average pore size of a porous material refers to the peak value of the pore size distribution. From the perspective of odor adsorption and the fact that aroma components emitted from fragrances are not easily adsorbed and the aroma is not easily altered or reduced, the peak value of the pore size of porous particles is preferably smaller than the size of the aroma components, preferably 0.1 μm or less, more preferably 0.04 μm or less, and more preferably 0.005 μm or more. The peak value of the pore size of porous particles is determined by the following method. <Method for Determining the Peak Value of Fine Pore Diameter in Porous Materials> The peak value of fine pore diameter in porous materials can be determined using a pore distribution measuring device (manufactured by Bayer Corporation, Japan, trade name: BELSORP mini II) via a multi-point method using liquid nitrogen. The peak in the pore distribution is defined as the peak value of the fine pore diameter. The sample is pretreated by heating at 110°C for 1 hour. As polyphenolic compounds, various compounds with low skin irritation and capable of converting odor-causing substances into non-volatile substances through chemical bonding can be used. Polyphenolic compounds can be water-soluble as defined by solubility, or they can be poorly water-soluble. Preferably, the polyphenolic compound is one that, while having lower solubility than the aforementioned water-soluble antibacterial agents, still possesses a certain degree of solubility. In this way, the polyphenolic compound can move to various positions within the central absorption section 33 without hindering the mobility of the water-soluble antibacterial agent, thereby rendering the odor-causing substance non-volatile. From the perspective of reducing skin irritation, polyphenolic compounds are preferably derived from natural sources. For example, polyphenolic compounds are preferably found in plant extracts. Specific examples of polyphenolic compounds include catechins from tea, polyphenols extracted from sugarcane, polyphenols extracted from cocoa, chlorogenic acid, anthocyanins, and ferulic acid. Among these, catechins from tea and sugarcane-derived polyphenols, which have stronger chemical binding properties, are preferred, and catechins from tea are even more preferred. Next, a preferred embodiment of the central absorbent portion 33 will be described. The central absorbent portion 33 is disposed in the center of the transverse direction X, including the area C1 opposite to the excretion portion. In Figure 2, the central absorbent portion 33 is located in the transverse direction X within the range corresponding to the area C1 opposite to the excretion portion. However, it is not limited to the embodiment shown in Figure 2. The central absorbent portion 33 may also be disposed in the transverse direction X within the range where it is laminated with the front absorbent sheet 31 and the back absorbent sheet 32 ​​in the thickness direction, in a region wider than the area C1 opposite to the excretion portion. From the viewpoint of increasing the contact opportunities between the above three components and the excretion liquid and thus exhibiting stable antibacterial and deodorizing effects over a long period of time, the ratio (W2 / W1) of the width W2 of the central absorbent portion 33 in the transverse direction X to the width W1 of the front absorbent sheet 31 and the back absorbent sheet 32 ​​in the transverse direction X is preferably 0.3 or more, and more preferably 0.4 or more. Furthermore, from the viewpoint of improving the inhibitory effect on the migration of the above three components from the absorber 3 to the outside, the ratio (W2 / W1) is preferably 0.7 or less, more preferably 0.6 or less, and even more preferably 0.5 or less. Furthermore, as shown in Figure 3, the central absorbent portion 33 is preferably shorter in the longitudinal Y direction than the front-side absorbent sheet 31 and the back-side absorbent sheet 32. This allows for greater contact between the three components and the excrement, resulting in a longer-lasting and stable antibacterial and deodorizing effect, and also improves the inhibition of the migration of the three components from the absorbent body 3 to the outside. More specifically, from the viewpoint of increasing the contact between the three components and the excrement to further improve the long-lasting and stable antibacterial and deodorizing effect, the ratio (T2 / T1) of the length T2 of the central absorbent portion 33 in the longitudinal Y direction to the length T1 of the front-side absorbent sheet 31 and the back-side absorbent sheet 32 ​​in the longitudinal Y direction is preferably 0.2 or more. Furthermore, from the viewpoint of improving the inhibition of the migration of the three components from the absorbent body 3 to the outside, the ratio (T2 / T1) is preferably 0.5 or less. Within the range described above, the central absorbent portion 33 is preferably a portion disposed along the longitudinal Y direction of the sanitary napkin 10 from the middle portion C, which includes the region C1 opposite the excretory portion, to the rear portion R. Preferably, the central absorbent portion 33 is shorter in length along the longitudinal Y direction than the front absorbent sheet 31 and the back absorbent sheet 32. Furthermore, in the laminated area between the central absorbent portion 33 and the front absorbent sheet 31 and the back absorbent sheet 32, the absorption capacity per unit area of ​​the central absorbent portion 33 is greater than the absorption capacity per unit area of ​​each of the front absorbent sheet 31 and the back absorbent sheet 32. Therefore, even during prolonged use of the sanitary napkin 10, the central absorbent portion 33 can reliably absorb and retain excretory fluid in the excretory region C1, further enhancing the antibacterial and deodorizing effects of the three components. In this case, if the polyphenol compound possesses the aforementioned water solubility, in addition to the aforementioned effects of the water-soluble antibacterial agent, the polyphenol compound can move to various locations within the central absorbent portion 33, causing the odor-causing substances to become non-volatile. Specifically, from the above perspective, the ratio (M3 / M1, M3 / M2) of the absorption capacity per unit area of ​​the central absorbent portion 33 to at least one of the absorption capacity per unit area of ​​the front absorbent sheet 31 (M1) and the absorption capacity per unit area of ​​the back absorbent sheet 32 ​​(M2) is preferably 1.1 or more, more preferably 1.5 or more, and even more preferably 2 or more. Furthermore, from the perspective of suppressing discomfort caused by excessive swelling due to excessive absorption of bodily fluids by the central absorbent portion 33, the above ratio (M3 / M1, M3 / M2) is preferably 20 or less, more preferably 15 or less, and even more preferably 10 or less. (Method for determining absorbency per unit area) The absorbency of the front absorbent sheet 31, the back absorbent sheet 32, and the central absorbent section 33 (hereinafter also referred to as each absorbent section) was determined according to the water absorption test method for superabsorbent resins, JIS K 7223-1996. Each absorbent section was removed from the absorbent article (sanitary napkin 1) and immersed entirely in physiological saline (0.9% sodium chloride solution) at 25°C. After 10 minutes from the start of immersion, the absorbent was removed from the physiological saline and dehydrated using a centrifuge (Kokusan (stock), model 130c, special model). The dehydration conditions were set to 800 rpm × 5 minutes. After dehydration, the mass of the sample was measured, and the centrifugal retention (unit: g / g) was calculated according to the following formula. This calculated value was divided by the area of ​​each absorbent section, and the resulting value was taken as the absorbency per unit area of ​​each absorbent section. In the following formula, the unit of mass is g. Centrifugation retention = (mass of absorbent after centrifugation and dehydration - mass of absorbent before water absorption) / mass of absorbent before water absorption. The measurement was performed 5 times, excluding the upper and lower values, and the average of the remaining 3 points was taken as the measured value. Furthermore, the measurement was conducted at 23±2℃ and 50±5% humidity. Before the measurement, each absorbent portion of the sample was stored under the same environment as the measurement for at least 24 hours. The central absorbent portion 33 preferably has a laminated structure of the aforementioned absorbent sheet, and contains a water-soluble antibacterial agent within the laminated structure. Here, the water-soluble antibacterial agent is located deeper within the laminated structure of the absorbent body 3. Therefore, the water-soluble antibacterial agent is less likely to come into contact with the skin, and its irritation to the skin is suppressed. Furthermore, in this case, it is preferable that the laminated structure of the absorbent sheet in the central absorbent portion 33 contains a water-soluble antibacterial agent, a porous material, and a polyphenol compound. The laminated structure of the absorbent sheet in the central absorbent section 33 can be formed by folding one absorbent sheet 3B as shown in FIG. 2, or by laminating multiple absorbent sheets. When forming the laminated structure of the central absorbent section 33 by folding one absorbent sheet 3B, various folding configurations can be adopted. In the configuration shown in FIG. 2, the central absorbent section 33 has a laminated structure formed by folding one absorbent sheet 3B into three folds at two bending portions A1 and A2 along the transverse X. By folding into three folds, the absorbent sheet 3B is divided into a first fold 33A, a second fold 33B, and a third fold 33C from the two ends E1 and E2 along the transverse X and the bending portions A1 and A2. The first fold 33A is the portion from the end E1 side to the bending portion A1, located on the skin-facing side 10A of the central absorbent section 33. The second fold 33B is the portion between the bent portions A1 and A2, located on the non-skin-facing side 10B of the central absorbent portion 33. The third fold 33C is the portion from the bent portion A2 to the end point E2, held in the thickness direction by the first fold 33A and the second fold 33B, and disposed inside the laminated structure of the central absorbent portion 33. The end point E1 of the first fold 33A and the end point E2 of the third fold 33C are arranged to overlap in the thickness direction at their central portions in the width direction X. Furthermore, the end point E2 of the third fold 33C is enclosed by the first fold 33A and the second fold 33B and enters the interior of the laminated structure of the central absorbent portion 33. As part of the aforementioned layered structure, it is preferable that the non-skin-facing side 10B of the first fold 33A, the skin-facing side 10A of the third fold 33C, and the skin-facing side 10A of the second fold 33B contain a water-soluble antibacterial agent. This makes it more difficult for the water-soluble antibacterial agent to come into contact with the skin, thus suppressing skin irritation. Excreted fluid travels through the front sheet 1 and the front side absorbent sheet 31 to the central absorbent portion 33. Generally, the excreted fluid diffuses along the longitudinal (Y) and transverse (X) directions on the surface of the central absorbent portion 33. Conversely, if the absorption capacity per unit area is highest in the central portion of the central absorbent portion 33 in the width direction X, and lower on the sides, then the absorption capacity of the central portion is more likely to be sufficient. Therefore, even if a large amount of excreted fluid reaches the central absorbent portion 33 due to prolonged wear, most of the excreted fluid will be absorbed and antibacterial in the central portion, thus maintaining a sustained antibacterial effect. Furthermore, if, as shown in Figure 2, the central absorbent portion is thicker in the width direction X at the central portion than on the sides, it is easier to conform to the wearer's excretory area and to easily draw excreted fluid into the central absorbent portion. Therefore, it is better to provide antibacterial protection in this narrow area of ​​the central absorbent portion, which is far from the skin. The laminated structure of the central absorbent portion 33 is not limited to the form shown in FIG2, and various folded forms are possible. For example, it may be a configuration in which at least one of the first fold portion 33A and the third fold portion 33C of the absorbent sheet 3B forming the central absorbent portion 33 extends to both ends of the second fold portion 33B, or a structure formed by overlapping absorbent sheets 3B shorter than those described in the above embodiment, or a central absorbent portion 33 with a narrower width is formed by laminating pulp fibers and highly absorbent polymers. Furthermore, as shown in Figure 4, the central absorbent section 33 preferably comprises a high-fiber section 35 with a higher content of fiber material and a low-fiber section 36 with a lower content of fiber material than the high-fiber section 35. The low-fiber section 36 contains the aforementioned water-soluble antibacterial agent, porous material, and polyphenolic compound. Therefore, when the central absorbent section 33 holds excrement, the liquid holding amount in the low-fiber section 36 is less than that in the high-fiber section 35. Consequently, compared to the high-fiber section 35, the low-fiber section 36 more readily contains the water-soluble antibacterial agent, or the water-soluble antibacterial agent and polyphenolic compound dissolved in a high concentration. Moreover, since the fiber content is less in the low-fiber section 36 than in the high-fiber section 35, the water-soluble antibacterial agent, or the water-soluble antibacterial agent and polyphenolic compound, are more easily mobile. Therefore, water-soluble antibacterial agents or water-soluble antibacterial agents and polyphenolic compounds dissolved in high concentrations can diffuse more widely and rapidly within the low-fiber content section 36, thereby more efficiently exhibiting the aforementioned antibacterial and deodorizing effects. The high-fiber presence section 35 and the low-fiber presence section 36 are samples of 3 cm × 3 cm cut along the longitudinal and transverse directions from the absorbent sheet unit constituting the central absorbent section 33. The longitudinal and transverse cross sections are magnified at a specific magnification, and the number of fibers in the field of view is counted. From the perspective of more effectively performing the above-mentioned functions and making it difficult for the three components, including the water-soluble antibacterial agent, to migrate to the outside of the central absorber 33, it is preferable that the low-fiber content portion 36 is disposed inside the higher-fiber content portion 35, closer to the central absorber 33. Furthermore, when the central absorber 33 has the aforementioned absorbent sheet 3B, it is preferable that the absorbent sheet 3B itself is a sheet with the high-fiber content portion 35 and the low-fiber content portion 36 laminated in the thickness direction. In this case, the high-fiber content portion 35 and the low-fiber content portion 36 can be laminated in a layered manner with clearly defined boundaries. Alternatively, the high-fiber content portion 35 and the low-fiber content portion 36 can also be laminated and integrated in a manner where their boundaries are indistinguishable, by having one fiber material enter the interfiber gaps of the other. In the absorbent sheet 3B, a porous material is pre-loaded between the fibers of the low-fiber portion 36, and a coating liquid containing a water-soluble antibacterial agent and a polyphenol compound is blown in by a sprayer or the like. This allows the low-fiber portion 36 to contain the water-soluble antibacterial agent, the porous material, and the polyphenol compound. For example, the configuration shown in Figure 5 can be used as a laminated structure for the central absorbent portion 33 of the absorbent sheet 3B, which includes the high-fiber portion 35 and the low-fiber portion 36. The central absorbent portion 33 shown in Figure 5 has a layered structure formed by folding the first fold 33A, the second fold 33B, and the third fold 33C into three folds, as shown in Figure 2. Each of the first fold 33A, the second fold 33B, and the third fold 33C has a high-fiber content portion 35 and a low-fiber content portion 36 layered in the thickness direction. Regarding the thickness of the first fold 33A and the third fold 33C, the high-fiber content portion 35 is disposed on the skin-facing side 10A, and the low-fiber content portion 36 is disposed on the non-skin-facing side 10B. Regarding the thickness of the second fold 33B, the low-fiber content portion 36 is disposed on the skin-facing side 10A, and the high-fiber content portion 35 is disposed on the non-skin-facing side 10B. In this laminated structure, the skin-facing side 10A of the central absorbent portion 33 is composed of a high-fiber content portion 35 of the first fold 33A, and the non-skin-facing side 10B of the central absorbent portion 33 is composed of a high-fiber content portion 35 of the second fold 33B. More specifically, from the skin-facing side 10A of the central absorbent portion 33 toward the non-skin-facing side 10B, six fiber layers are laminated in the order of high-fiber content portion 35, low-fiber content portion 36, high-fiber content portion 35, low-fiber content portion 36, low-fiber content portion 36, and high-fiber content portion 35. Herein, three low-fiber content portions 36 are disposed within the laminated structure between the high-fiber content portions 35 of the first fold 33A and the high-fiber content portions 35 of the second fold 33B. In particular, the low-fiber content portion 36 of the third pleat 33C and the low-fiber content portion 36 of the second pleat 33B are directly laminated without separating from the high-fiber content portion 35, forming a low-fiber content laminated portion 37. In the above-mentioned laminated structure of the central absorber 33, it is preferable that the three low-fiber content portions 36 (each of the low-fiber content portions 36 of the first pleat 33A, the second pleat 33B, and the third pleat 33C) contain the aforementioned water-soluble antibacterial agent, porous material, and polyphenol compound. Therefore, in the low-fiber content laminated portion 37 formed by directly laminating the three low-fiber content portions 36, especially the two low-fiber content portions 36, within the laminated structure of the central absorber 33, the above three components, including the water-soluble antibacterial agent, are less likely to migrate to the outside of the central absorber 33, thus more effectively exhibiting the aforementioned effect. As a result, Sanitary Napkin 10 can further suppress skin irritation and continuously suppress odor. When the absorbent sheet 33B forming the central absorbent portion 33 has the aforementioned high-fiber content portion 35 and low-fiber content portion 36, from the viewpoint of obtaining an absorbent article with sufficient liquid diffusion, liquid retention, and good wearing comfort, the thickness of the absorbent sheet 33B is preferably 0.1 mm or more, more preferably 0.3 mm or more. Furthermore, it is preferably 2 mm or less, more preferably 1.5 mm or less. The materials forming the components of the sanitary napkin 10 can be used without particular restriction by the user of this article. As the front sheet 1, various sheets with liquid permeability can be used. For example, nonwoven fabrics with single or multiple layers, or open-cell membranes, can be used. Considering the good feel against the skin, hydrophilic nonwoven fabrics are preferred, thermally bonded nonwoven fabrics are more preferred, and hot-air nonwoven fabrics are particularly preferred. The fibers constituting the nonwoven fabric of the front sheet 1 are preferably thermoplastic resin fibers that have undergone hydrophilic treatment, and these fibers are three-dimensionally crimped, such as by secondary or tertiary crimping. Specifically, the fibers constituting the nonwoven fabric of the front sheet 1 are hydrophilicized by coating various hydrophilic agents before the production of composite fibers such as polyethylene, polypropylene, polyester, nylon, and the like, and cutting them into short fibers of a specific length. As hydrophilic agents, commonly used hydrophilic agents such as various alkyl sulfonates represented by α-olefin sulfonates, acrylates, acrylate / acrylamide copolymers, esteramides, esteramide salts, polyethylene glycol and its derivatives, water-soluble polyester resins, various silicone derivatives, various sugar derivatives, and mixtures thereof can be used for hydrophilic treatment. Furthermore, the front sheet 1 may also have an uneven surface on the side facing the skin. When the front sheet 1 has a multi-layered structure, it may have a first fiber layer located closer to the wearer's skin and a second fiber layer located further away from the wearer's skin. The first and second fiber layers are integrated in the thickness direction by a plurality of locally formed joints. The portion of the first fiber layer located between the plurality of joints is convex, allowing the use of an uneven sheet with the aforementioned uneven shape. For example, the uneven sheet with a solid convex structure can be described in Japanese Patent Application Publication No. 2007-182662 or Japanese Patent Application Publication No. 2002-187228. As the backing sheet 2, a resin film or a laminate of a resin film and a nonwoven fabric can be used. The backing sheet 2 is preferably made of a liquid-impermeable (including liquid-resistant) or water-repellent material, and preferably a moisture-permeable resin film. The second sheet 4 is preferably hydrophilic and has excellent liquid diffusion properties. Examples include nonwoven fabrics containing thermoplastic fibers. As a nonwoven fabric, nonwoven fabrics obtained by various manufacturing methods can be used. For example, hot-air nonwoven fabrics formed on a fiber web obtained by carding or air spinning by hot air method, hot-rolled nonwoven fabrics formed on a fiber web obtained by carding by hot rolling method, heat-embossed nonwoven fabrics, spunlace nonwoven fabrics, needle-punched nonwoven fabrics, resin-bonded nonwoven fabrics, and other nonwoven fabrics can be used. Furthermore, the absorbent 3 preferably has a color associated with at least one of the water-soluble antibacterial agent, porous material, and polyphenolic compound on its front side absorbent sheet 31, and this color is visible at least through the front sheet 1. Here, "associated color" refers to a color that consumers can associate with the effect based on social or cultural context, or a color that consumers can associate with the effect based on descriptions on product packaging or the internet such as "the image of catechins in green tea with antibacterial effects." With this configuration, the wearer can recognize the effect of the absorbent item before wearing it, thus preventing the misuse of absorbent items that lack function or have different functions. Furthermore, it is preferable that the absorbent sheet 32 ​​on the back side exhibits a color associated with at least one of the water-soluble antibacterial agent, porous material, and polyphenolic compound, and that this color is visible through the front sheet 1 or the back sheet 2. By making the color visible from the back sheet 3 side, the user can confirm the effectiveness even before opening the package. Regarding the menstrual sanitary napkin 1, since each individual menstrual sanitary napkin 1 is individually packaged using a packaging sheet before use, it is even better if the color of the absorbent sheet 32 ​​on the back side is visible through the packaging sheet, allowing for identification of its function before opening. Furthermore, in the menstrual sanitary napkin 10, it is preferable that the absorbent sheet 31 on the front side and the absorbent sheet 32 ​​on the back side are colored the same color. In this way, even if each absorbent sheet 31 and 32 does not contain much of the pigment to be used, the user can easily identify the color, thus reducing the impact on the absorption rate or absorption capacity of bodily fluids, which is therefore better. As the side leak-proof sheet 5, laminated nonwoven fabric with high water pressure resistance, resin film and nonwoven fabric laminate, etc. can be used. The absorbent articles of this invention are not limited to the menstrual sanitary napkins described in the above embodiments; for example, they are suitable for panty liners, incontinence pads, absorbent pads, disposable diapers, etc. Furthermore, they are not limited to menstrual blood, but are also effective for other substances such as urine, vaginal secretions, and loose stools. In addition to the aforementioned constituent components, other components may be appropriately incorporated according to their intended use or function. Regarding the above embodiments, the present invention further discloses the following absorbent articles. <1> An absorbent article comprising a liquid-permeable front sheet disposed on the skin-facing side, a back sheet disposed on the non-skin-facing side, and an absorbent body between the two sheets, the absorbent body comprising an absorbent sheet containing fibrous material as a constituent member, and the aforementioned absorbent article having a longitudinal direction corresponding to the front-back direction of the wearer and a transverse direction orthogonal to the longitudinal direction; and the absorbent body having a laminated structure at least in the central portion of the aforementioned transverse direction, the laminated structure comprising a front absorbent sheet on the skin-facing side, a back absorbent sheet on the non-skin-facing side, and a central absorbent portion between the two sheets, the aforementioned central absorbent portion containing a water-soluble antibacterial agent, a porous material, and a polyphenol compound. <2> The absorbent article described in <1> above, wherein the entire area of ​​the central absorbent portion, when viewed from above, contains the water-soluble antibacterial agent, porous material, and polyphenolic compound. <3> The absorbent article described in <1> or <2> above, wherein the central absorbent portion has a laminated structure of the absorbent sheet, and the water-soluble antibacterial agent is contained within the laminated structure. <4> The absorbent article described in any one of <1> to <3> above, wherein the polyphenolic compound is a naturally derived component. <5> The absorbent article described in <4> above, wherein the polyphenolic compound is catechin from tea leaves. <6> The absorbent article described in any one of <1> to <5> above, wherein the water-soluble antibacterial agent is a quaternary ammonium salt. <7> As described in any one of <1> to <6> above, the longitudinal length of the central absorbent portion is shorter than that of the front absorbent sheet and the back absorbent sheet, and in the laminated area of ​​the central absorbent portion and the front absorbent sheet and the back absorbent sheet, the absorption capacity per unit area of ​​the central absorbent portion is greater than the absorption capacity per unit area of ​​each of the front absorbent sheet and the back absorbent sheet. <8> As described in <7>, the ratio of the absorption capacity per unit area of ​​the central absorbent portion to at least one of the absorption capacities per unit area of ​​the front absorbent sheet and the back absorbent sheet is 1.1 to 20, preferably 1.5 to 15, and more preferably 2 to 10. <9> The absorbent article described in any one of <1> to <8> above, wherein the central absorbent portion comprises a high-fiber portion with a higher content of the aforementioned fibrous material and a low-fiber portion with a lower content of the aforementioned fibrous material than the high-fiber portion, and the low-fiber portion contains the aforementioned water-soluble antibacterial agent, porous material, and polyphenol compound. <10> The absorbent article described in any one of <1> to <9> above, wherein the absorbency per unit area of ​​the central absorbent portion is highest in the width direction at the center of the central absorbent portion, and lower at the two sides than at the center. <11> The absorbent article described in any one of <1> to <10> above, wherein the thickness of the central absorbent portion is greater in the width direction at the center than at the two sides. <12> The absorbent article described in any one of <1> to <11> above, wherein the water-soluble antibacterial agent in the central absorbent portion contains 0.003 g / m³. 2 Above 5.0 g / m 2 The preferred value is 0.005 g / m 2 Above 3.0 g / m 2 The preferred value is 0.010 g / m. 2 Above 1.0 g / m 2 The following. <13> The absorbent article described in any of <1> to <12> above, wherein the porous material in the central absorbent portion contains a basis weight of 0.5 g / m³. 2 The above is preferably 1.0 g / m 2 The above, again, is 10 g / m 2 The preferred value is 5.0 g / m³. 2 The following. <14> The absorbent article described in any of <1> to <13> above, wherein the polyphenol compound content in the central absorbent portion is 0.001 g / m³. 2 The above is preferably 0.003 g / m 2 The above is preferred to be 0.005 g / m 2 That's all. Also, it's 5.0 g / m³. 2 The preferred value is 3.0 g / m³. 2 The following is preferred: 1.0 g / m 2 The following are examples of absorbent articles: <15> The absorbent material described in any one of <1> to <14> above is a porous deodorant. <16> The absorbent material described in any one of <1> to <15> above is an absorbent article in which the porous material carries an antibacterial metal. <17> The absorbent material described in any one of <1> to <16> above is an absorbent article in which the front absorbent sheet exhibits a color associated with the function of the water-soluble antibacterial agent, the porous material, or the polyphenolic compound. <18> The absorbent material described in any one of <1> to <17> above is an absorbent article in which the back absorbent sheet exhibits a color associated with the function of the water-soluble antibacterial agent, the porous material, or the polyphenolic compound. <19> The absorbent article described in any of <1> to <18> above, wherein the polyphenolic compound is catechin from tea leaves, and the color of the absorbent sheet on the front side is green. The invention and its embodiments and examples have been described, but unless otherwise specified, we do not intend to limit the invention with any details described, but rather believe that it should be interpreted broadly without departing from the spirit and scope of the invention as shown in the appended claims. This case asserts priority based on Japanese Patent Application No. 2021-201888, filed on December 13, 2021, the contents of which are incorporated herein by reference and are incorporated herein by reference as part of the description. 1: Front sheet 2: Back sheet 3: Absorbent body 3A, 3B: Absorbent sheet 4: Second sheet 5: Side leak-proof sheet 6: Wings 9: Outer sealing part 10: Menstrual sanitary napkin 10A: Skin-facing side 10B: Non-skin-facing side 31: Front side absorbent sheet 32: Back side absorbent sheet 33: Central absorbent part 33A: First pleat 33B: Second pleat 33C: Third pleat 35: High fiber content part 36: Low fiber content part 37: Low fiber content laminated part A1: Bending part A2: Bending part C: Middle part C1: Excretion part opposite area (liquid receiving area) E1: End E2: End F: Front part R: Back part T1: Length T2: Length W1: Width W2: Width X: Lateral Y: Longitudinal Figure 1 is a partial cross-sectional perspective view schematically shown from the skin-contact side of a menstrual sanitary pad in its stretched state, representing a preferred embodiment of the absorbent article of the present invention. Figure 2 is a cross-sectional view schematically showing the II-II section of the menstrual sanitary pad shown in Figure 1. Figure 3 is a top view showing the absorbent body in its state viewed from the skin-facing side. Figure 4 is a cross-sectional view schematically showing the laminated state of the high-fiber and low-fiber portions of the central absorbent section. Figure 5 is a cross-sectional view showing a preferred example of the laminated structure of the central absorbent section formed by folding an absorbent sheet including the high-fiber and low-fiber portions. 1: Front sheet 2: Back sheet 3: Absorber 4: Second sheet 5: Side leak-proof sheet 6: Wings 9: Peripheral sealing part 10: Menstrual pads 10A: Skin facing the face 10B: Non-skin-facing side C: Middle section C1: The area opposite the excretory part (the area receiving liquid) F: Front section R: Rear section X: Horizontal Y: Vertical axis

Claims

1. An absorbent article comprising a liquid-permeable front sheet disposed on the skin-facing side, a back sheet disposed on the non-skin-facing side, and an absorbent body between the two sheets, the absorbent body comprising an absorbent sheet containing fibrous material as a constituent member, and the absorbent article having a longitudinal direction corresponding to the wearer's front-back direction and a transverse direction orthogonal to the longitudinal direction; and the absorbent body having a laminated structure at least at the central portion of the transverse direction of the absorbent body, the laminated structure comprising a front absorbent sheet on the skin-facing side, a back absorbent sheet on the non-skin-facing side, and a central absorbent portion between the two sheets, the central absorbent portion containing a water-soluble antibacterial agent, a porous material, and a polyphenolic compound, wherein the water-soluble antibacterial agent is a quaternary ammonium salt.

2. The absorbent article of claim 1, wherein the entire area of ​​the central absorbent portion, when viewed from above, contains the water-soluble antibacterial agent, porous material, and polyphenol compound.

3. The absorbent article of claim 1 or 2, wherein the central absorbent portion has a laminated structure of the absorbent sheet and contains the water-soluble antibacterial agent within the laminated structure.

4. The absorbent articles as claimed in item 1 or 2, wherein the aforementioned polyphenolic compounds are derived from natural ingredients.

5. The absorbent article as claimed in item 4, wherein the aforementioned polyphenolic compound is catechin from tea leaves.

6. The absorbent article of claim 1 or 2, wherein the longitudinal length of the central absorbent portion is shorter than that of the front absorbent sheet and the back absorbent sheet, and in the laminated area of ​​the central absorbent portion and the front absorbent sheet and the back absorbent sheet, the absorbent capacity per unit area of ​​the central absorbent portion is greater than that per unit area of ​​each of the front absorbent sheet and the back absorbent sheet.

7. The absorbent article of claim 6, wherein the ratio of the absorption capacity per unit area of ​​the central absorbent portion to at least one of the absorption capacity per unit area of ​​the front absorbent sheet and the back absorbent sheet is 1.1 or more and 20 or less.

8. The absorbent article of claim 1 or 2, wherein the central absorbent portion comprises a high-fiber portion having a higher content of the aforementioned fibrous material and a low-fiber portion having a lower content of the aforementioned fibrous material than the high-fiber portion, wherein the low-fiber portion contains the aforementioned water-soluble antibacterial agent, porous material and polyphenol compound.

9. The absorbent article of claim 8, wherein the low-fiber content portion is disposed inside the absorbent portion further centrally than the high-fiber content portion.

10. The absorbent article of claim 8, wherein the central absorbent portion has an absorbent sheet, the absorbent sheet being a sheet having the high-fiber portion and the low-fiber portion laminated in the thickness direction.

11. The absorbent article of claim 10, wherein the central absorbent portion has a laminated structure formed by folding the absorbent sheet into three folds at the first fold, the second fold, and the third fold, and six fiber layers are laminated from the skin-facing side of the central absorbent portion toward the non-skin-facing side in the order of high-fiber content, low-fiber content, high-fiber content, low-fiber content, low-fiber content, and high-fiber content, and the low-fiber content of the third fold and the low-fiber content of the second fold are laminated directly without separating from the high-fiber content, forming a low-fiber content laminated portion.

12. The absorbent article of claim 1 or 2, wherein the absorbent capacity per unit area of ​​the central absorbent portion is highest in the width direction at the center of the central absorbent portion, and lower at the two sides than at the center.

13. The absorbent article as claimed in claim 1 or 2, wherein the thickness of the central absorbent portion is greater in the width direction at the center than at the sides.

14. The absorbent article as claimed in item 1 or 2, wherein the water-soluble antibacterial agent in the central absorbent portion contains a basis weight of 0.003 g / m2 or more and 5.0 g / m2 or less.

15. The absorbent article of claim 1 or 2, wherein the porous material in the central absorbent portion contains a basis weight of 0.5 g / m2 or more and 10 g / m2 or less.

16. The absorbent article of claim 1 or 2, wherein the polyphenol compound content in the central absorbent portion is 0.001 g / m2 or more and 5.0 g / m2 or less by weight.

17. The absorbent article as claimed in claim 1 or 2, wherein the aforementioned porous material is a porous deodorant.

18. The absorbent article of claim 1 or 2, wherein the aforementioned porous material carries an antimicrobial metal.

19. The absorbent article of claim 1 or 2, wherein the absorbent sheet on the front side has a color associated with the function of the water-soluble antibacterial agent, porous material or polyphenol compound.

20. The absorbent article of claim 19, wherein the polyphenolic compound is catechin from tea leaves, and the absorbent sheet on the front side is green.

21. The absorbent article of claim 1 or 2, wherein the absorbent sheet on the back side has a color associated with the function of the water-soluble antibacterial agent, porous material or polyphenol compound.

22. The absorbent article of claim 21, wherein the absorbent article is individually packaged by a packaging sheet before use, and the color of the absorbent sheet on the back side can be seen through the packaging sheet.

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