Absorbent article

Abstract

To provide an absorbent article capable of suppressing stimulation to a skin, and suppressing continuous bad odor.MEANS: There is provided an absorbent article comprising: a surface sheet 1; a rear surface sheet 2; and an absorber 3 which includes as a constituent, an absorbent sheet including a textile material between both the sheets. and comprises a vertical direction Y corresponding to a cross direction of a wearer, and a lateral direction X orthogonal to the vertical direction Y, the absorber 3 comprises: a laminate structure comprising, a front surface absorbent sheet 31 provided on a skin facing surface side 10A, a rear surface absorbent sheet 32 provided on a non skin facing surface side 10B, and a center absorbent part 33 provided between both the sheets, on at least a center part of the absorber 3 in the lateral direction X, where the center absorbent part 33 includes a water soluble antimicrobial agent, a porous material and a polyphenol compound.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to absorbent articles such as sanitary napkins, incontinence pads, and diapers.

Background Art

[0002] Excreted fluids such as menstrual blood and urine are odorless immediately after excretion, but decompose over time due to the action of bacteria, generating malodor-causing substances. There are various malodor-causing substances, including, for example, trimethylamine, which easily emits an unpleasant odor. Conventionally, a technique of incorporating an antibacterial agent in absorbent articles such as sanitary napkins has been known (for example, Patent Documents 1 to 4).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0004] In absorbent articles, the antibacterial effect of the antibacterial agent is not visually recognizable, so it can generally be felt by reducing malodor, itching and rash of the skin caused by bacteria. However, generally, antibacterial agents are not effective against all bacteria. Further, if the content of the antibacterial agent is increased too much to cope with long-term use of the absorbent article, the antibacterial agent may rather irritate the skin due to the return of the excreted fluid to the skin side. Therefore, there is room for further improvement in absorbent articles from the viewpoint of reducing malodor.

[0005] In view of the above points, the present invention relates to an absorbent article capable of suppressing continuous malodor while suppressing irritation to the skin.

Means for Solving the Problems

[0006] The present invention provides an absorbent article including a liquid-permeable surface sheet disposed on the skin-facing surface side, a back sheet disposed on the non-skin-facing surface side, and an absorber including an absorbent sheet containing a fiber material as a constituent member between these two sheets, the absorbent article having a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal to the longitudinal direction, wherein the absorber has a laminated structure including a surface-side absorbent sheet located on the skin-facing surface side, a back-side absorbent sheet located on the non-skin-facing surface side, and a central absorption portion located between these two sheets at at least the central portion in the lateral direction of the absorber, and provides an absorbent article containing a water-soluble antibacterial agent, a porous material, and a polyphenol compound in the central absorption portion.

Effects of the Invention

[0007] The absorbent article according to the present invention can suppress continuous malodor while suppressing irritation to the skin.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0009] Hereinafter, a sanitary napkin (hereinafter also referred to as a napkin) 10 as a preferred embodiment of the absorbent article according to the present invention will be described with reference to the drawings. In the present invention, unless otherwise specified, the side that contacts the human body is referred to as the skin-facing surface side, and the opposite side is referred to as the non-skin-facing surface side. These are also used as terms indicating the relative positional relationship in the member configuration of the absorbent article even for members that do not have a surface that contacts the human body. Also, the direction located on the front side of the human body during wearing is referred to as the front, and the direction located on the rear side is referred to as the rear. The normal direction of the surface or the back surface of the absorbent article is referred to as the thickness direction.

[0010] As shown in FIGS. 1 and 2, the napkin 10 includes a liquid-permeable surface sheet 1 disposed on the skin-facing surface side 10A, a back sheet 2 disposed on the non-skin-facing surface side 10B, and a liquid-retaining absorbent body 3 between these two sheets 1 and 2. The surface sheet 1 has liquid permeability to send excreted liquid into the absorbent body 3, and the back sheet 2 has leakage prevention properties against excreted liquid. The surface sheet 1 and the back sheet 2 cover both surfaces of the absorbent body 3 and have a size that extends outward beyond the outer edge of the absorbent body 3. Note that the above-mentioned skin-facing surface side 10A and non-skin-facing surface side 10B are used as terms indicating the relative arrangement positions in the thickness direction of the components of the napkin 10 as well as the napkin 10 itself.

[0011] In the present embodiment, between the surface sheet 1 and the absorbent body 3, there is a liquid-permeable second sheet 4 that is narrower in width than the absorbent body 3. The second sheet 4 has the effect of spreading the excreted liquid permeated from the surface sheet 1 in the planar direction and increasing the absorption area on the skin side of the absorbent body 3. Also, side leakage prevention sheets 5 are laminated on both sides of the skin contact surface side of the surface sheet 1. The side leakage prevention sheets 5 and the back sheet 2 extend outward in the lateral direction X of the absorbent body 3 to form a wing portion 6 which is a fixing means to clothing or the like. On the non-skin contact surface side of the wing portion 6 and the back sheet 2, there is an adhesive portion (not shown) for fixing the napkin 10 to clothing. In the laminated structure of this sheet, the outer peripheral edge of the napkin 10 is an outer peripheral seal portion 9 joined without intervening the absorbent body 3.

[0012] The napkin 10 may include other components, or may be in a form without the second sheet 4, the wing portions 6, and the side leakage prevention sheets 5. Further, it may have a leakage prevention groove squeezed from the top sheet 1 to the absorber 3, a plurality of embossments on the top sheet 1, and the like. Also, the side leakage prevention sheets 5 may be joined to the top sheet 1 while leaving free ends on the inner side rather than on both sides of the top sheet 1, and an elastic member or the like may be disposed on the free ends to form a leakage prevention cuff.

[0013] In plan view, the napkin 10 has a vertically long shape having a longitudinal direction Y corresponding to the front-back direction of the wearer and a lateral direction X orthogonal to the longitudinal direction. Also, the top sheet 1, the back sheet 2, and the absorber 3 are vertically long in the same manner as the napkin 10. The longitudinal direction Y corresponds to the direction connecting the abdominal side, the crotch, and the back side of the wearer when the napkin 10 is worn. The lateral direction X corresponds to the direction connecting the left and right legs of the wearer at the crotch. In this specification, the longitudinal direction Y and the lateral direction X indicate the directions in the plan view of the napkin 10, and at the same time, the directions in the plan view of the top sheet 1, the back sheet 2, and the absorber 3.

[0014] The napkin 10 has an intermediate portion C including a portion facing the excretion point of the wearer in the longitudinal direction Y. Further, in the longitudinal direction Y, it has a front portion F disposed on the lower abdominal side in front of the intermediate portion C and a rear portion R disposed on the hip side behind the intermediate portion C. Also, in the intermediate portion C, at the central portion in the lateral direction X, there is an excretion portion facing region (also referred to as a liquid receiving region) C1 that faces the excretion point and directly receives the excreted liquid. The “central portion” in the lateral direction X where the excretion portion facing region C1 is located refers to a range of a predetermined width extending left and right from the center line L in the lateral direction X, as shown in FIG. 1, and refers to a portion within the range inside both end edges of the absorber 3 in the lateral direction X. Specifically, it is a region extending left and right from the center line L in the lateral direction X of the napkin 10 and is a portion in the range of 40% or more and 60% or less with respect to the width of the absorber 3. Note that the intermediate portion C, the excretion portion facing region C1, the front portion F, and the rear portion R indicate the divisions in the napkin 10 and at the same time also indicate the corresponding divisions in the top sheet 1, the absorber 3, and the back sheet 2.

[0015] The division positions of the middle part C, the front part F, and the rear part R can be appropriately set according to the length of the absorbent article set according to the purpose of use or the like. When there is a wing part that is bent and fixed to the crotch part of the shorts, the area along the longitudinal direction where the wing part exists becomes the middle part C. The napkin 10 of the present embodiment shows an example of a shape set for daytime use or the like. The longitudinal length is divided into three equal parts, and the front part F, the middle part C, and the rear part R are set. In the case of a daytime napkin without a wing part, the middle part follows this setting. Generally, regardless of the shape of the napkin 10, the middle part C can be set as a part at a certain distance from the front part F. Further, for adult or infant diapers, and also for urine collection pads, etc., the longitudinal length is divided into three equal parts, and the front part F, the middle part C, and the rear part R are set.

[0016] Next, the absorber 3 will be described.

[0017] The absorber 3 includes an absorbent sheet containing a fiber material as a constituent member. The fiber material has hydrophilicity capable of absorbing excreted liquid, and examples include those obtained by hydrophilizing hydrophobic fibers and hydrophilic fibers that are themselves hydrophilic. In particular, those that are themselves hydrophilic and have water retention are preferable. Preferred examples of hydrophilic fibers include natural fibers, cellulose-based regenerated fibers, or semi-synthetic fibers. Examples of hydrophilic fibers having water retention include cellulose-based fibers such as wood pulp fibers, rayon fibers, cotton fibers, and cellulose acetate fibers. The cellulose-based fibers can be used alone or in combination of two or more. Examples of the raw material pulp of the cellulose-based fibers include wood pulp such as softwood kraft pulp or hardwood kraft pulp, and non-wood pulp such as cotton pulp or straw pulp. As the cellulose-based fibers, crosslinked cellulose fibers (pulp fibers) obtained by crosslinking the inside or between molecules of cellulose with an appropriate crosslinking agent, or regenerated cellulose fibers such as rayon fibers with improved crystallinity of cellulose can also be used. As the absorbent sheet containing the fiber material, it may contain synthetic fibers, such as thermoplastic fibers, together with or in place of the cellulose-based fibers. As the thermoplastic fibers, for example, single fibers formed using a single synthetic resin such as polyethylene, polypropylene, polyester, polyurethane, etc., or composite fibers formed using synthetic resins such as composites of two or more of these, for example, core-sheath type, side-by-side type composite fibers formed using two or more synthetic resins can also be used. These synthetic fibers are preferably hydrophilized as described above.

[0018] The absorbent sheet may be a sheet composed only of the fiber material, or may be a sheet in which a superabsorbent polymer material is sandwiched and fixed between two fiber layers made of the fiber material. The superabsorbent polymer material mentioned here is a surface-crosslinked polymer material called so-called SAP (hereinafter the same). In forming the absorbent sheet containing the superabsorbent polymer material, it can be integrated by utilizing the adhesive force exhibited by the superabsorbent polymer material due to wetting, or binders such as adhesives or adhesive fibers added separately. For example, those described in paragraphs

[0019] ~

[0127] of Japanese Patent No. 2963647, paragraphs

[0020] ~

[0075] of Japanese Patent No. 2955223, etc. can be mentioned. Its production can be carried out by various commonly used methods, and either a wet method or a dry method may be used. While suppressing the thickness of the absorbent sheet to 3.0 mm or less, since the superabsorbent polymer material is dispersedly arranged in the plane direction of the sheet, gel blocking is difficult to occur, and it has a high absorption capacity. For example, those described in paragraphs

[0019] to

[0131] of Japanese Patent Application Laid-Open No. 8-246395, etc. can be mentioned.

[0019] As the highly absorbent polymer material, generally particulate materials are used, but fibrous materials may also be used. When using particulate highly absorbent polymers, their shape may be spherical, massive, bag-shaped or amorphous. As the highly absorbent polymer material, generally, polymers or copolymers of acrylic acid or alkali metal salts of acrylic acid can be used. Examples thereof include polyacrylic acid and its salts, and polymethacrylic acid and its salts. As the polyacrylate or polymethacrylate, the sodium salt can be preferably used. Further, copolymers obtained by copolymerizing acrylic acid or methacrylic acid with a comonomer such as maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2-(meth)acryloylethanesulfonic acid, 2-hydroxyethyl (meth)acrylate or styrenesulfonic acid within a range not reducing the performance of the highly absorbent polymer material can also be used.

[0020] As shown in FIG. 2, the absorber 3 has a front-side absorbent sheet 31 and a back-side absorbent sheet 32 as the absorbent sheets. The front-side absorbent sheet 31 and the back-side absorbent sheet 32 have a length extending from the middle portion C to the front portion F and the rear portion R, and form the outer shape of the absorber 3. The front - side absorbent sheet 31 and the back - side absorbent sheet 32 may be formed by folding a single absorbent sheet 3A as shown in FIG. 2, or may be formed by separate absorbent sheets. In the embodiment shown in FIG. 2, for the absorbent sheet 3A, the portion disposed on the skin - facing surface side 10A of the absorber 3 becomes the front - side absorbent sheet 31, and the portion disposed on the non - skin - facing surface side 10B of the absorber 3 becomes the back - side absorbent sheet 32. Also, the absorbent sheet 3A can take various folding modes. In the embodiment shown in FIG. 2, a single absorbent sheet 3A is extended in the lateral direction X from the skin - facing surface side 10A and wound around to the non - skin - facing surface side 10B, and both end portions of the absorbent sheet 3A in the lateral direction X are overlapped and joined on the non - skin - facing surface side 10B. However, the folding mode is not limited to this. For example, both end portions of a single absorbent sheet 3A in the lateral direction X may be overlapped and joined at the side portions of the absorber 3 in the lateral direction X, or may be overlapped and joined on the skin - facing surface side 10A. From the viewpoint of enhancing the absorbency of excretory fluid and reducing the contact opportunity of the water - soluble antibacterial agent, porous material, and polyphenol compound described later with the skin, the mode in which both end portions of a single absorbent sheet 3A in the lateral direction X are overlapped and joined on the non - skin - facing surface side 10B as shown in FIG. 2 is preferable.

[0021] The absorber 3 has a laminated structure including a front - side absorbent sheet 31 located on the skin - facing surface side 10A, a back - side absorbent sheet 32 located on the non - skin - facing surface side 10B, and a central absorbent portion 33 located between these two sheets at least at the central portion in the lateral direction X. The central absorbent portion 33 is in the region including the aforementioned excretion - part facing region C1. The preferred embodiment of the central absorbent portion 33 will be described later.

[0022] The sanitary napkin 10 contains a water - soluble antibacterial agent, a porous material, and a polyphenol compound in the central absorbent portion 33. That is, inside the laminated structure of the absorber 3, in the central absorbent portion 33 that corresponds to the excretion - part facing region C1 and absorbs the most excretory fluid, the above - mentioned water - soluble antibacterial agent, porous material, and polyphenol compound are contained. In the central absorbent portion 33, it is preferable that the water - soluble antibacterial agent, porous material, and polyphenol compound are dispersedly arranged while being mixed. The water-soluble antibacterial agent, the porous material, and the polyphenol compound are located in the central absorption part 33 corresponding to the excretion part facing area C1, so that the opportunity to contact excreted fluids such as menstrual blood (hereinafter simply referred to as excreted fluids) is the highest among those in the napkin 10. Moreover, due to the laminated structure of the absorber 3, the migration of the water-soluble antibacterial agent, the porous material, and the polyphenol compound from the absorber 3 to the outside is suppressed. In particular, since the laminated structure of the absorber 3 increases the distance between the surface sheet and the central absorption part 33, the backflow of the excreted fluid from the central absorption part 33 to the surface sheet 1 is suppressed, and it is difficult for the water-soluble antibacterial agent dissolved in the excreted fluid to migrate to the surface sheet 1. As a result, the water-soluble antibacterial agent, the porous material, and the polyphenol compound can stably contact the excreted fluid for a long time and efficiently exhibit antibacterial and deodorizing effects. In addition, due to the antibacterial action in the central absorption part 33, the contact opportunity between bacteria and the skin is reduced, and the irritation to the skin is suppressed. Furthermore, since the migration of the water-soluble antibacterial agent from the inside to the outside of the laminated structure of the absorber 3 is suppressed as described above, the irritation to the skin caused by the water-soluble antibacterial agent is suppressed. In particular, since the skin-facing surface side 10A of the central absorption part 33 is covered by the surface-side absorption sheet 31 which is a separate member and an interlayer gap is interposed, compared with the case where the thickness of the absorber 3 is simply increased, the inhibitory effect on the exudation of the excreted fluid in which the water-soluble antibacterial agent dissolves to the skin-facing surface side 10A is high. Also, since not only the water-soluble antibacterial agent alone but also the water-soluble antibacterial agent, the porous material, and the polyphenol compound cooperate to exhibit a high antibacterial and deodorizing effect, the water-soluble antibacterial agent can have a high malodor suppression effect even in a relatively small amount.

[0023] The cooperative action of the above-mentioned water-soluble antibacterial agent, porous material, and polyphenol compound will be described below. First, because the water-soluble antibacterial agent is water-soluble, it can dissolve in the excreted fluid when the excreted fluid penetrates into the central absorption part 33. By dissolving, the water-soluble antibacterial agent moves within the central absorption part 33 from the initial stage of excretion and exerts an antibacterial action, and can suppress the growth of bacteria in various places where the excreted fluid in the central absorption part 33 exists. Thereby, the water-soluble antibacterial agent can, for example, suppress the decomposition of proteins in menstrual blood by bacteria, and suppress the generation of odor-causing substances. On the one hand, when a water-soluble antibacterial agent is generally contained in excess for the purpose of enhancing its effect, when a strong external force is applied to the napkin 10 due to the wearer's movement or the like, a part of the water-soluble antibacterial agent has a high risk of migrating from the central absorption part 33 to the member on the skin side, and consequently, the risk of skin irritation increases. To solve this problem, in the present invention, polyphenol is contained in the central absorption part 33. Polyphenol compounds are likely to chemically react with odor-causing substances such as trimethylamine, and can deodorize by changing the odor-causing substances into non-volatile substances. Therefore, polyphenol compounds can deodorize odor-causing substances that are re-released after being adsorbed by the porous material without re-releasing them by chemical bonding action. In addition, in the present invention, the central absorption part 33 contains a porous material. The porous material has a role of providing a reaction field so that the polyphenol compound can react more easily. Generally, the volatilization rate of the odor-causing substance is often faster than the reaction rate between the odor-causing substance and the polyphenol compound, and in that case, there is a possibility that the polyphenol compound cannot fully exhibit its deodorizing function. Therefore, in the present invention, the porous material can temporarily capture the odor-causing substance, and by reacting with the odor-causing substance gradually released therefrom, the two can be reacted more efficiently. Since the porous material is generally water-insoluble while the polyphenol compound is water-soluble, after absorbing the excretory fluid, the polyphenol compound surrounds the porous material. Furthermore, when the pore fluidity is hydrophilic, such as when a hydroxyl group is introduced into the pores of the porous material, the polyphenol compound can penetrate into the pores and react before the odor-causing substance volatilizes, which is preferable. In this way, the porous material and the polyphenol compound can exhibit strong deodorizing performance by compensating for each other's weaknesses. By containing the above three components in the central absorption part 33, in the initial stage of excretion, the growth of bacteria that cause odor is suppressed by the water-soluble antibacterial agent to cut off the source of odor, while in the initial stage of decomposition of the excreted fluid by bacteria that cannot be completely captured, physical adsorption is performed by the porous material to deodorize, and the odor-causing substances released over time are chemically made non-volatile by the polyphenol compound. In this way, the odor components are comprehensively contained in a three-stage structure, and this containment can be sustained in the central absorption part 33 which is the internal structure of the absorber 3.

[0024] As a result, the sanitary napkin 10 can continuously suppress malodors while suppressing irritation to the skin.

[0025] In the sanitary napkin 10, from the viewpoint of further enhancing the above-mentioned continuous malodor suppression effect, it is preferable that the water-soluble antibacterial agent, the porous material, and the polyphenol compound are contained throughout the entire area in the plan view of the central absorption part 33. When the three components are arranged over the entire area in the direction parallel to the sheet surface in the central absorption part 33, the containing positions in the thickness direction of the central absorption part 33 may vary depending on the location. The preferable containing positions in this thickness direction will be described later. As a result, when the sanitary napkin 10 repeatedly receives excreted fluid due to long-term use or the like, even if the excreted fluid diffuses in the central absorption part 33, the contact opportunity between the three components and the excreted fluid can be increased, and the above-mentioned actions can be exhibited in a wider range.

[0026] Also, in the sanitary napkin 10, from the viewpoint of more effectively suppressing the irritation to the skin caused by the water-soluble antibacterial agent, it is preferable that the surface-side absorbent sheet 31 does not contain the water-soluble antibacterial agent.

[0027] In the combination of the water-soluble antibacterial agent, the porous material, and the polyphenol compound, a high malodor suppression effect can be obtained even when the content of the water-soluble antibacterial agent is reduced compared to the case of containing the water-soluble antibacterial agent alone as described above. Therefore, the contained flat weight of the water-soluble antibacterial agent in the central absorption part 33 is preferably 5.0 g / m from the viewpoint of further reducing irritation to the skin. 2 The following is preferable, and 3.0 g / m2 The following is more preferable, 1.0 g / m 2 The following is even more preferable. Also, from the viewpoint of maintaining the antibacterial action, the content per unit area of the water-soluble antibacterial agent in the central absorption part 33 is preferably 0.003 g / m 2 or more, more preferably 0.005 g / m 2 or more, even more preferably 0.010 g / m 2 or more. From the viewpoint of enhancing the adsorption action on the odor-causing substances, the content per unit area of the porous material in the central absorption part 33 is preferably 0.5 g / m 2 or more, more preferably 1.0 g / m 2 or more. Also, from the viewpoint of maintaining the absorption performance of the central absorption part 33, the content per unit area of the porous material in the central absorption part 33 is preferably 10 g / m 2 or less, more preferably 5.0 g / m 2 or less. From the viewpoint of enhancing the chemical bonding action on the odor-causing substances, the content per unit area of the polyphenol compound in the central absorption part 33 is preferably 0.001 g / m 2 or more, more preferably 0.003 g / m 2 or more, even more preferably 0.005 g / m 2 or more. Also, from the viewpoint of maintaining the absorption performance of the absorber 3, the content per unit area of the polyphenol compound in the central absorption part 33 is preferably 5.0 g / m 2 or less, more preferably 3.0 g / m 2 or less, even more preferably 1.0 g / m 2 or less.

[0028] Also, from the viewpoint of more effectively suppressing the irritation to the skin caused by the water-soluble antibacterial agent and more effectively expressing the above-mentioned action by the combination of the water-soluble antibacterial agent, the porous material and the polyphenol compound, the ratio of the content per unit area of the water-soluble antibacterial agent in the central absorption part 33 to the content per unit area of the water-soluble antibacterial agent in the napkin 10 is preferably 80% or more, more preferably 90% or more, and even more preferably 100%.

[0029] "Water-soluble" in the water-soluble antibacterial agent means that the solubility in 1 L of ion-exchanged water at 25°C is 2 g or more. From the viewpoint of enhancing the solubility and mobility of the water-soluble antibacterial agent in the excreted fluid, the solubility is preferably 3 g or more, and more preferably 10 g or more. The solubility can be measured by the following method. Add a sufficiently dried measurement target (water-soluble antibacterial agent) to 1 L of ion-exchanged water at 25°C placed in a 2 L beaker. Then, insert a stirrer chip with a length of 20 mm and a width of 7 mm (for example, HPS-100 manufactured by AS ONE Corporation), and stir at 600 rpm using a magnetic stirrer. The input amount immediately before it cannot be dissolved even after stirring for 1 hour is defined as the solubility of the antibacterial agent in water at 25°C.

[0030] As the water-soluble antibacterial agent, various agents having solubility and mobility in the excreted fluid and exhibiting an antibacterial action can be used. For example, antibacterial metals, antibacterial metal carriers, organic antibacterial agents, etc. can be mentioned. That the antibacterial metal carrier is water-soluble means that even if the carrier carrying the antibacterial metal is hardly water-soluble, the carried metal is water-soluble. Specific examples thereof include silver-supported silica and silver-supported zeolite. As the organic antibacterial agent, those having a cationic structure with a water-soluble counter ion or a nonionic structure, which have a relatively small or medium total number of carbon chains (4 to 20 carbon atoms), can be preferably selected as the water-soluble antibacterial agent. Specific examples thereof include quaternary ammonium salts and alkylpyridinium chlorides having the above structure. Among them, quaternary ammonium salts are preferred. Among the quaternary ammonium salts, benzethonium chloride, benzalkonium chloride, and cetylpyridinium chloride having the above structure are preferred as those having a high affinity for bacteria.

[0031] As the porous material, various materials commonly used in this type of article can be used as long as they have pores capable of capturing odor-causing substances, and porous particles are preferred. Among them, those having deodorizing performance (hereinafter referred to as porous deodorants) are preferable because a certain deodorizing effect can be expected even before the odor-causing substance reacts with polyphenol, and particularly porous deodorant particles are preferable. Further, the porous material preferably supports an antibacterial metal. The porous particles as the porous material refer to particles having a large number of pores at least on the particle surface and capable of collecting, adsorbing, and / or encapsulating volatile odor-causing substances in the pores. Examples of the material of the porous particles include organic compounds, inorganic compounds, or polymers thereof, or combinations thereof. Specific examples thereof include acrylic polymers such as porous polymethacrylic acid and porous polyacrylic acid, aromatic polymers such as porous divinylbenzene polymer and porous pyridine copolymer, and synthetic porous polymers such as copolymers thereof; natural porous polymers such as chitin and chitosan; metal-supported porous materials such as inorganic porous substances such as zinc oxide, activated carbon, silica, silicon dioxide (silica gel), calcium silicate, aluminosilicate compounds, high-silica zeolite (hydrophobic zeolite), sepiolite, cancrinite, zeolite, and hydrated zirconium oxide. It is preferable to contain at least one selected from the group consisting of these. The odor components derived from excretions such as urine and menstrual blood to be deodorized are a mixture of multiple components such as ammonia, amines, fatty acids, hydrogen sulfide, and mercaptans. Generally, since the molecular sizes of these odor components are 1 nm or more, by using porous particles having an average pore diameter of 2 nm or more as a deodorant, multiple odor components can be effectively adsorbed.

[0032] The average pore diameter of the porous material means the peak of the pore diameter in the pore diameter distribution. The peak of the pore diameter of the porous particles is preferably smaller than the size of the aroma component from the viewpoints of the adsorption effect of odor and the difficulty of adsorbing the aroma components volatilized from the fragrance described later, and the resistance to the alteration and reduction of the fragrance. Preferably, it is 0.1 μm or less, more preferably 0.04 μm or less, and preferably 0.005 μm or more. The peak of the pore diameter of the porous particles is measured by the following method.

[0033] <Method for Measuring the Peak of the Pore Diameter of the Porous Material> The peak of the pore diameter of the porous material can be measured by the multi-point method using liquid nitrogen with a pore distribution measuring device (manufactured by BEL Japan, Inc., trade name: BELSORP mini II). The peak top in the pore distribution is defined as the peak of the pore diameter. The measurement sample is subjected to a pretreatment of heating at 110 °C for 1 hour.

[0034] As the polyphenol compound, various compounds that cause little irritation to the skin and can convert odor-causing substances into non-volatile substances by chemical bonds can be used. The polyphenol compound may be water-soluble as defined by solubility above, or may be sparingly water-soluble and not corresponding to the water solubility. The polyphenol compound preferably has a certain degree of solubility while having a lower solubility than the aforementioned water-soluble antibacterial agent. Thereby, the polyphenol compound can move to various places in the central absorption part 33 to such an extent that it does not inhibit the mobility of the water-soluble antibacterial agent and make the odor-causing substances non-volatile.

[0035] From the viewpoint of reducing irritation to the skin, such a polyphenol compound is preferably a natural-derived component. For example, the polyphenol compound is preferably a component contained in a plant extract. Specific examples of the polyphenol compound include tea catechins, sugarcane extract polyphenols, cocoa extract polyphenols, chlorogenic acid, anthocyanins, ferulic acid, etc. Among them, tea catechins and sugarcane extract polyphenols, which have a strong chemical bonding action, are preferred, and tea catechins are more preferred.

[0036] Next, a preferred embodiment of the central absorption part 33 will be described. The central absorption part 33 is disposed at the central part in the lateral direction X and includes the excretion part facing region C1. In FIG. 2, the central absorption part 33 is in the range corresponding to the excretion part facing region C1 in the lateral direction X. However, not limited to the embodiment shown in FIG. 2, the central absorption part 33 may be disposed in a region wider than the excretion part facing region C1 in the range where it is laminated with the front-side absorbent sheet 31 and the back-side absorbent sheet 32 in the thickness direction in the lateral direction X. The ratio (W2 / W1) of the width W2 in the lateral direction X of the central absorption part 33 to the width W1 in the lateral direction X of the front-side absorbent sheet 31 and the back-side absorbent sheet 32 is preferably 0.3 or more, more preferably 0.4 or more, from the viewpoint of increasing the contact opportunity with the excreted liquid of the above-mentioned three components and exhibiting a stable antibacterial and deodorizing effect for a long time. Also, the ratio (W2 / W1) is preferably 0.7 or less, more preferably 0.6 or less, and still more preferably 0.5 or less, from the viewpoint of enhancing the suppression of the transfer of the above-mentioned three components from the absorber 3 to the outside.

[0037] Also, as shown in FIG. 3, the central absorption part 33 preferably has a shorter length in the longitudinal direction Y than the front-side absorbent sheet 31 and the back-side absorbent sheet 32. Thereby, the contact opportunity with the excreted liquid of the above-mentioned three components can be increased to exhibit a stable antibacterial and deodorizing effect for a long time, and the suppression of the transfer of the above-mentioned three components from the absorber 3 to the outside can be enhanced. More specifically, the ratio (T2 / T1) of the length T2 in the longitudinal direction Y of the central absorption part 33 to the length T1 in the longitudinal direction Y of the front-side absorbent sheet 31 and the back-side absorbent sheet 32 is preferably 0.2 or more from the viewpoint of increasing the contact opportunity with the excreted liquid of the above-mentioned three components and enhancing the stable antibacterial and deodorizing effect for a long time. Also, the ratio (T2 / T1) is preferably 0.5 or less from the viewpoint of enhancing the suppression of the transfer of the above-mentioned three components from the absorber 3 to the outside. In the range of the above ratio, the central absorption part 33 is preferably disposed from a part of the intermediate part C including the excretion part facing part region C1 to a part of the rear part R in the longitudinal direction Y of the napkin 10.

[0038] The central absorption part 33 is shorter in the longitudinal direction Y than the front-side absorbent sheet 31 and the back-side absorbent sheet 32. In the region where the central absorption part 33 is laminated with the front-side absorbent sheet 31 and the back-side absorbent sheet 32, it is preferable that the absorption capacity per unit area of the central absorption part 33 is larger than the absorption capacity per unit area of each of the front-side absorbent sheet 31 and the back-side absorbent sheet 32. Thereby, even when the napkin 10 is used for a long time, in the excretion part facing region C1, the central absorption part 33 can firmly absorb and hold the excreted liquid, and the antibacterial and deodorizing effects by the above three kinds of components can be further enhanced. In this case, when the polyphenol compound has the above-mentioned water solubility, in addition to the above-mentioned action by the water-soluble antibacterial agent, it can move to various places in the central absorption part 33 to make the odor-causing substances non-volatile. Specifically, the ratio (M3 / M1, M3 / M2) of the absorption capacity per unit area (M3) of the central absorption part 33 to at least one of the absorption capacity per unit area (M1) of the front-side absorbent sheet 31 and the absorption capacity per unit area (M2) of the back-side absorbent sheet 32 is preferably 1.1 or more, more preferably 1.5 or more, and still more preferably 2 or more from the above viewpoints. Also, the ratio (M3 / M1, M3 / M2) is preferably 20 or less, more preferably 15 or less, and still more preferably 10 or less from the viewpoint of suppressing the sense of discomfort during wearing due to excessive swelling caused by the central absorption part 33 absorbing excessive body fluids.

[0039] (Measurement method of absorption capacity per unit area) For each of the surface absorbent sheet 31, the back surface absorbent sheet 32, and the central absorbent portion 33 (hereinafter also referred to as each absorbent portion), the absorption capacity is measured in accordance with JIS K 7223-1996, which is a water absorption test method for superabsorbent polymers. Each absorbent portion is taken out from the absorbent article (napkin 1) and immersed in physiological saline (0.9 mass% sodium chloride solution) adjusted to 25°C so that the whole is submerged. After 10 minutes from the start of immersion, the absorbent body is taken out from the physiological saline and dehydrated using a centrifugal dehydrator (Kokusan Co., Ltd., model 130c special type). The dehydration conditions are 800 rpm × 5 minutes. After dehydration, the mass of the sample is measured, and the centrifugal retention amount (unit: g / g) is calculated according to the following formula, and the value obtained by dividing the calculated value by the area of each absorbent portion is taken as the absorption capacity per unit area of each absorbent portion. In the following formula, each mass is in g units. Centrifugal retention amount = (mass of the absorbent body after centrifugal dehydration - mass of the absorbent body before water absorption) / mass of the absorbent body before water absorption The measurement is performed 5 times, and the values of the top and bottom points are excluded, and the average value of the remaining 3 points is taken as the measured value. In addition, the measurement is performed at 23 ± 2°C and a humidity of 50 ± 5%, and before the measurement, each absorbent portion as a sample is stored in the same environment as the measurement for 24 hours or more.

[0040] The central absorbent portion 33 preferably has the laminated structure of the absorbent sheet described above, and a water-soluble antibacterial agent is preferably contained inside the laminated structure. As a result, the water-soluble antibacterial agent will be present deeper inside 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 the irritation to the skin caused by the water-soluble antibacterial agent is suppressed. In this case, it is also preferable that a porous material and a polyphenol compound are contained inside the laminated structure of the absorbent sheet in the central absorbent portion 33 together with the water-soluble antibacterial agent.

[0041] The above-described laminated structure of the absorbent sheet in the central absorption part 33 may be formed by folding a single absorbent sheet 3B as shown in FIG. 2, or may be formed by laminating a plurality of absorbent sheets. When the laminated structure of the central absorption part 33 is formed by folding a single absorbent sheet 3B, various folding modes can be taken. In the mode shown in FIG. 2, the central absorption part 33 has a laminated structure in which a single absorbent sheet 3B is folded into three at two bending parts A1 and A2 in the lateral direction X. By the above-mentioned three-fold folding, the absorbent sheet 3B is divided into a first folding part 33A, a second folding part 33B, and a third folding part 33C by both end parts E1 and E2 in the lateral direction X and the above-mentioned bending parts A1 and A2. The first folding part 33A is a part from the end part E1 side to the bending part A1, and is located on the skin-facing surface side 10A in the central absorption part 33. The second folding part 33B is a part between the bending parts A1 and A2, and is located on the non-skin-facing surface side 10B in the central absorption part 33. The third folding part 33C is a part from the bending part A2 to the end part E2, and is sandwiched in the thickness direction by the first folding part 33A and the second folding part 33B, and is arranged inside the laminated structure of the central absorption part 33. The end part E1 of the first folding part 33A and the end part E2 of the third folding part 33C are arranged to overlap in the thickness direction at the central part in the width direction X. In addition, the end part E2 of the third folding part 33C is wrapped by the first folding part 33A and the second folding part 33B and enters inside the laminated structure of the central absorption part 33. As the inside of the laminated structure, it is preferable that a water-soluble antibacterial agent is contained on the non-skin-facing surface side 10B of the first folding part 33A, the third folding part 33C, and the skin-facing surface side 10A of the second folding part 33B. Thereby, the water-soluble antibacterial agent is less likely to come into contact with the skin, and the irritation to the skin by the water-soluble antibacterial agent is suppressed.

[0042] The excreted excretory fluid reaches the central absorption part 33 through the surface sheet 1 and the surface-side absorbent sheet 31. At this time, generally, the excretory fluid diffuses in the longitudinal direction Y and the transverse direction X on the surface of the central absorption part 33. At this time, in the width direction X of the central absorption part 33, if the absorption capacity per unit area is the highest at the center in the width direction X of the central absorption part 33 and lower at both side parts than at the central part, there is likely to be a margin in the absorption capacity of the central part. Even if a large amount of excretory fluid reaches the central absorption part 33 during long-term wearing, a large amount of excretory fluid is absorbed and antibacterial at the central part where it first arrives, so the antibacterial effect is likely to continue. Also, like the central absorption part shown in FIG. 2, if the structure is thicker at the center in the width direction X of the central absorption part than at both side parts, it becomes easier to fit to the wearer's excretion part and easier to draw the excretory fluid into the central absorption part. Therefore, it is easy to bring about an antibacterial action in a narrow place, that is, the central absorption part separated from the skin, which is preferable.

[0043] The laminated structure of the central absorption part 33 is not limited to the mode shown in FIG. 2, and various folding modes can be adopted. For example, at least one of the first folding part 33A and the third folding part 33C of the absorbent sheet 3B forming the central absorption part 33 reaches both ends of the second folding part 33B, or a structure in which absorbent sheets 3B shorter than the above-described embodiment are stacked, or a narrow-width central absorption part 33 can be formed by mixing and laminating pulp fibers and a superabsorbent polymer.

[0044] Furthermore, as shown in FIG. 4, the central absorption part 33 includes a high fiber presence part 35 with a high content of fiber material and a low fiber presence part 36 with a lower content of the fiber material than the high fiber presence part 35. It is preferable that the low fiber presence part 36 contains the aforementioned water-soluble antibacterial agent, porous material, and polyphenol compound. Thereby, when the central absorption part 33 holds the excreted liquid, the liquid holding amount of the low fiber presence part 36 becomes less than that of the high fiber presence part 35. Therefore, in the low fiber presence part 36, the water-soluble antibacterial agent, or the water-soluble antibacterial agent and the polyphenol compound are more likely to be dissolved at a high concentration compared to the high fiber presence part 35. Also, in the low fiber presence part 36, since the amount of fiber is less than that of the high fiber presence part 35, the water-soluble antibacterial agent, or the water-soluble antibacterial agent and the polyphenol compound are more likely to move. Therefore, the water-soluble antibacterial agent eluted at a high concentration, or the water-soluble antibacterial agent and the polyphenol compound can diffuse more widely and faster within the low fiber presence part 36, and the aforementioned antibacterial and deodorizing effects can be expressed more efficiently.

[0045] In the absorption sheet unit constituting the central absorption part, for the high fiber presence part 35 and the low fiber presence part 36, a 3 cm × 3 cm sample is cut out in the longitudinal and lateral directions, and photographs of the cross-sections in the longitudinal and lateral directions are taken at a predetermined magnification, and the number of fibers in the visual field is counted.

[0046] From the viewpoint of more effectively expressing the above effects and making it difficult for the three components including the water-soluble antibacterial agent to migrate outside the central absorber 33, it is preferable that the low fiber presence part 36 is arranged inside the central absorption part 33 more than the high fiber presence part 35. Further, when the central absorption part 33 has the absorbent sheet 3B described above, it is preferable that the absorbent sheet 3B itself is a sheet in which the high fiber presence part 35 and the low fiber presence part 36 are laminated in the thickness direction. In this case, the high fiber presence part 35 and the low fiber presence part 36 may be laminated in layers with a clear boundary between them. Alternatively, the high fiber presence part 35 and the low fiber presence part 36 may be laminated and integrated in a state where the boundary between them cannot be distinguished, for example, by one fiber material entering the inter-fiber voids of the other fiber material. In the absorbent sheet 3B, a porous material is previously supported between the fibers of the low fiber presence part 36, and a coating liquid in which a water-soluble antibacterial agent and a polyphenol compound are dissolved is sprayed or the like, so that the low fiber presence part 36 can contain the water-soluble antibacterial agent, the porous material, and the polyphenol compound. As a laminated structure of the central absorption part 33 using the absorbent sheet 3B composed of the high fiber presence part 35 and the low fiber presence part 36, for example, the mode shown in FIG. 5 can be mentioned.

[0047] As shown in FIG. 5, the central absorption part 33 in the embodiment has a laminated structure formed by folding the first folding part 33A, the second folding part 33B, and the third folding part 33C in a three-fold manner. In each of the first folding part 33A, the second folding part 33B, and the third folding part 33C, there are a high fiber presence part 35 and a low fiber presence part 36 laminated in the thickness direction. Regarding the thickness of each of the first folding part 33A and the third folding part 33C, the high fiber presence part 35 is arranged on the skin-facing surface side 10A, and the low fiber presence part 36 is arranged on the non-skin-facing surface side 10B. Regarding the thickness of the second folding part 33B, the low fiber presence part 36 is arranged on the skin-facing surface side 10A, and the high fiber presence part 35 is arranged on the non-skin-facing surface side 10B. In this laminated structure, the skin-facing surface side 10A of the central absorption part 33 is constituted by the high fiber presence part 35 of the first folding part 33A, and the non-skin-facing surface side 10B of the central absorption part 33 is constituted by the high fiber presence part 35 of the second folding part 33B. More specifically, six fiber layers are laminated in the order of the high fiber presence part 35, the low fiber presence part 36, the high fiber presence part 35, the low fiber presence part 36, the low fiber presence part 36, and the high fiber presence part 35 from the skin-facing surface side 10A to the non-skin-facing surface side 10B of the central absorption part 33. As a result, the three low fiber presence parts 36 are arranged inside the laminated structure between the high fiber presence part 35 of the first folding part 33A and the high fiber presence part 35 of the second folding part 33B. In particular, the low fiber presence part 36 of the third folding part 33C and the low fiber presence part 36 of the second folding part 33B are directly laminated without passing through the high fiber presence part 35, forming a low fiber presence laminated part 37. In the laminated structure of the central absorption part 33, it is preferable that the three low fiber presence parts 36 (the low fiber presence parts 36 of the first folding part 33A, the second folding part 33B, and the third folding part 33C respectively) contain the above-mentioned water-soluble antibacterial agent, porous material, and polyphenol compound. Thereby, in the three low fiber presence parts 36 arranged inside the laminated structure of the central absorption part 33, particularly in the low fiber presence laminated part 37 where the two low fiber presence parts 36, 36 are directly laminated, it is difficult for the three components including the water-soluble antibacterial agent to migrate to the outside of the central absorber 33, and the above-mentioned action can be more effectively exhibited. As a result, the napkin 10 can further suppress the irritation to the skin while continuously suppressing the bad odor.

[0048] When the absorbent sheet 33B that forms the laminated structure of the central absorption part 33 has the above-described high-fiber presence part 35 and low-fiber presence part 36, the thickness of this absorbent sheet 33B is preferably 0.1 mm or more, more preferably 0.3 mm or more, from the viewpoint of obtaining an absorbent article that sufficiently has liquid diffusibility and liquid retention and has a good wearing feeling. Also, it is preferably 2 mm or less, more preferably 1.5 mm or less.

[0049] The forming materials of the members constituting the napkin 10 can be used without particular limitation as those used for this kind of article.

[0050] As the surface sheet 1, various sheets having liquid permeability can be used. For example, a single-layer or multi-layer non-woven fabric, a perforated film, etc. can be used. Considering the good touch, a hydrophilic non-woven fabric is preferable, a thermal bond non-woven fabric is more preferable, and an air-through non-woven fabric is particularly preferable. The fibers constituting the non-woven fabric of the surface sheet 1 are heat-moldable resin fibers that have been hydrophilized, and it is preferable that the fibers have a three-dimensional crimp such as a secondary crimp or a tertiary crimp. Specifically, the fibers constituting the non-woven fabric of the surface sheet 1 are made of polyethylene, polypropylene, polyester, nylon, and composite fibers thereof, and are hydrophilized by applying various hydrophilizing agents at a stage before cutting them to a predetermined length to form staples. As the hydrophilizing agent, various alkyl sulfonates typified by α-olefin sulfonates, acrylate salts, acrylate / acrylamide copolymers, ester amides, salts of ester amides, polyethylene glycol and its derivatives, water-soluble polyester resins, various silicone derivatives, various sugar derivatives, and mixtures thereof, etc., hydrophilization treatment with commonly used hydrophilizing agents can be used.

[0051] In addition, the surface sheet 1 may have irregularities on the skin-facing side. When the surface sheet 1 has a multi-layer structure, it may have a first fiber layer located closer to the wearer's skin and a second fiber layer located farther from the wearer's skin. The first fiber layer and the second fiber layer may be integrated in the thickness direction by a large number of joining parts formed partially, and a part located between the plurality of the joining parts in the first fiber layer may bulge convexly to form a convex part of the uneven shape, and an uneven sheet can be used. As the uneven sheet in which the convex part has a solid structure, for example, those described in JP-A-2007-182662 and JP-A-2002-187228 can be used.

[0052] As the back sheet 2, a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. The back sheet 3 is preferably liquid-impermeable (including liquid-resistant) or water-repellent, and it is also preferable to use a moisture-permeable resin film or the like.

[0053] The second sheet 4 is preferably hydrophilic and has excellent liquid diffusibility. Examples include nonwoven fabrics containing thermoplastic fibers. As the nonwoven fabric, nonwoven fabrics obtained by various manufacturing methods can be used. For example, an air-through nonwoven fabric in which heat fusion points between fibers are formed by the air-through method on a fiber web obtained by the card method or the air-laid method, a heat-roll nonwoven fabric in which heat fusion points between fibers are formed by the heat-roll method on a fiber web obtained by the card method, various nonwoven fabrics such as heat embossed nonwoven fabric, spunlace nonwoven fabric, needle-punched nonwoven fabric, and resin-bonded nonwoven fabric can be used.

[0054] In addition, the absorber 3 preferably has a color in which the surface-side absorbent sheet 31 is linked with at least one of a water-soluble antibacterial agent, a porous material, and a polyphenol compound, and the color is visible at least through the surface sheet 1. Here, the "linked color" refers to a color that consumers can imagine to have an effect depending on the social and cultural backgrounds, or a color that consumers can link to the effect by notations such as "green is an image of tea catechins having an antibacterial effect" on product packages or the Internet. By having such a configuration, the wearer can recognize the effect of the absorbent article before wearing it, so that it is possible to prevent the use of absorbent articles that have no function or different functions by mistake.

[0055] Furthermore, the back-side absorbent sheet 32 preferably has a color in which it is linked with at least one of a water-soluble antibacterial agent, a porous material, and a polyphenol compound, and the color is visible through the surface sheet 1 or through the back sheet 2. By making the color visible from the back sheet 3 side, the user can confirm the image of the effect even before opening. In the sanitary napkin 1, since the individual sanitary napkins 1 are individually packaged with a packaging sheet before use, it is more preferable that the color of the back-side absorbent sheet 32 can be seen through the packaging sheet, so that the function can be recognized before opening.

[0056] In the sanitary napkin 10, it is preferable that the surface-side absorbent sheet 31 and the back-side absorbent sheet 32 are colored with the same color. By doing so, even if the content of the pigment used in each absorbent sheet 31, 32 is not excessive, it becomes easier for the user to recognize the color, so that the influence on the liquid absorption rate and absorption capacity of body fluids is reduced, which is preferable.

[0057] As the side leakage-preventing sheet 5, a laminated nonwoven fabric with high water pressure resistance, a laminate of a resin film and a nonwoven fabric, or the like can be used.

[0058] The absorbent article of the present invention is not limited to the sanitary napkin of the above embodiment, and can be applied to, for example, panty liners, incontinence pads, urine collection pads, disposable diapers, etc. Further, it is effective not only for menstrual blood but also for other substances such as urine, body fluids, and soft stools. In addition to the above-described constituent members, members may be appropriately incorporated according to the use and function.

[0059] Regarding the above-described embodiment, the present invention further discloses the following absorbent articles.

[0060] <1> An absorbent article comprising a liquid-permeable surface sheet disposed on the skin-facing side, a back sheet disposed on the non-skin-facing side, and an absorber including an absorbent sheet containing a fiber material as a constituent member between these two sheets, the absorbent article having a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal to the longitudinal direction, The absorber has a laminated structure including a surface-side absorbent sheet located on the skin-facing side, a back-side absorbent sheet located on the non-skin-facing side, and a central absorption portion located between these two sheets at at least the central portion in the lateral direction of the absorber. An absorbent article containing a water-soluble antibacterial agent, a porous material, and a polyphenol compound in the central absorption portion.

[0061] <2> The absorbent article according to <1>, wherein the water-soluble antibacterial agent, the porous material, and the polyphenol compound are contained throughout the central absorption portion in plan view. <3> The absorbent article according to <1> or <2>, wherein the central absorption portion has a laminated structure of the absorbent sheet, and the water-soluble antibacterial agent is contained inside the laminated structure. <4> The absorbent article according to any one of <1> to <3>, wherein the polyphenol compound is a natural-derived component. <5> The absorbent article according to <4>, wherein the polyphenol compound is tea catechin. <6> The absorbent article according to any one of <1> to <5>, wherein the water-soluble antibacterial agent is a quaternary ammonium salt. <7> The central absorption portion is shorter in the longitudinal direction than the surface-side absorbent sheet and the back-side absorbent sheet. The absorbent article according to any one of <1> to <6>, wherein in a region where the central absorption portion, the surface-side absorbent sheet, and the back-side absorbent sheet are laminated, the absorption capacity per unit area of the central absorption portion is larger than the absorption capacity per unit area of each of the surface-side absorbent sheet and the back-side absorbent sheet. <8> The absorbent article according to <7>, wherein the ratio of the absorption capacity per unit area of the central absorption portion to at least one of the absorption capacities per unit area of the surface-side absorbent sheet and the back-side absorbent sheet is 1.1 or more and 20 or less, preferably 1.5 or more and 15 or less, and more preferably 2 or more and 10 or less. <9> The central absorption portion includes a high fiber presence portion with a high content of the fiber material and a low fiber presence portion with a lower content of the fiber material than the high fiber presence portion, and the water-soluble antibacterial agent, the porous material, and the polyphenol compound are contained in the low fiber presence portion. The absorbent article according to any one of <1> to <8>. <10> The absorbent article according to any one of <1> to <9>, wherein the absorption capacity per unit area is highest at the center in the width direction of the central absorption portion and lower at both side portions than at the central portion. <11> The absorbent article according to any one of <1> to <10>, wherein the central absorption portion is thicker at the center in the width direction than at both side portions in the width direction. <12> The contained flat amount of the water-soluble antibacterial agent in the central absorption portion is 0.003 g / m 2 or more and 5.0 g / m 2 or less, preferably 0.005 g / m 2 or more and 3.0 g / m 2 or less, and more preferably 0.010 g / m 2 or more and 1.0 g / m 2The absorbent article according to any one of <1> to <11> above. <13> The contained basis weight of the porous material in the central absorption part is 0.5 g / m 2 or more, preferably 1.0 g / m 2 or more, and also 10 g / m 2 or less, preferably 5.0 g / m 2 The absorbent article according to any one of <1> to <12> above. <14> The contained basis weight of the polyphenol compound in the central absorption part is 0.001 g / m 2 or more, preferably 0.003 g / m 2 or more, more preferably 0.005 g / m 2 or more. Also, 5.0 g / m 2 or less, preferably 3.0 g / m 2 or less, more preferably 1.0 g / m 2 The absorbent article according to any one of <1> to <13> above. <15> The absorbent article according to any one of <1> to <14> above, wherein the porous material is a porous deodorant. <16> The absorbent article according to any one of <1> to <15> above, wherein the porous material supports an antibacterial metal. <17> The absorbent article according to any one of <1> to <16> above, wherein the surface-side absorbent sheet exhibits a color linked to the function of the water-soluble antibacterial agent, the porous material, or the polyphenol compound. <18> The absorbent article according to any one of <1> to <17> above, wherein the back-side absorbent sheet exhibits a color linked to the function of the water-soluble antibacterial agent, the porous material, or the polyphenol compound. <19> The absorbent article according to any one of <1> to <18> above, wherein the polyphenol compound is tea catechin and the color of the surface-side absorbent sheet is green.

Explanation of Reference Numerals

[0062] 1 Surface sheet 2 Back sheet 3 Absorbent body 31 Surface-side absorbent sheet 32 Back-side absorbent sheet 33 Central absorbent part 35 High-fiber presence part 36 Low-fiber presence part 3A, 3B Absorbent sheet 10 Sanitary napkin 10A Skin-facing side 10B Non-skin-facing side

Claims

1. An absorbent article comprising an absorber having, as constituent members, a liquid-permeable surface sheet disposed on the skin-facing side, a back sheet disposed on the non-skin-facing side, and an absorbent sheet containing a hydrophilic and water-retaining fibrous material between these two sheets, the absorbent article having a longitudinal direction corresponding to the front-back direction of the wearer and a lateral direction orthogonal to the longitudinal direction, wherein the absorber has a laminated structure including a surface-side absorbent sheet located on the skin-facing side, a back-side absorbent sheet located on the non-skin-facing side, and a central absorbent portion located between these two sheets, at least at the central portion in the lateral direction of the absorber, the central absorbent portion contains a water-soluble antibacterial agent, a porous material, and a polyphenol compound, the water-soluble antibacterial agent is a quaternary ammonium salt, the polyphenol compound is water-soluble and has a lower solubility than the water-soluble antibacterial agent, in the central absorbent portion, the water-soluble antibacterial agent, the porous material, and the polyphenol compound are dispersedly arranged while being mixed, the thickness in the central absorbent portion is larger than that at both ends in the lateral direction at the central portion in the lateral direction, and the absorption capacity per unit area in the central absorbent portion is larger than that at both side portions in the lateral direction at the central portion in the lateral direction. Absorbent article.

2. The central absorbent portion is disposed in a range corresponding to the excretion portion facing region, and the lengths in the longitudinal direction and the lateral direction of the central absorbent portion are shorter than the lengths in the longitudinal direction and the lateral direction of the surface-side absorbent sheet and the back-side absorbent sheet, respectively, and the surface-side absorbent sheet and the back-side absorbent sheet are formed by folding a single absorbent sheet, and both end portions in the lateral direction of the single absorbent sheet are overlapped on the skin-facing side or the non-skin-facing side. The absorbent article according to claim 1.

3. The absorbent article according to claim 1 or 2, wherein the water-soluble antibacterial agent, the porous material, and the polyphenol compound are contained throughout the entire area in plan view of the central absorbent portion.

4. The absorbent article according to any one of claims 1 to 3, wherein the central absorbent portion has a laminated structure of the absorbent sheet, and the water-soluble antibacterial agent is contained inside the laminated structure.

5. The absorbent article according to any one of claims 1 to 4, wherein the polyphenol compound is a natural-derived component.

6. The absorbent article according to claim 5, wherein the polyphenol compound is tea catechin.

7. The central absorption portion is shorter in the longitudinal direction than the surface-side absorbent sheet and the back-side absorbent sheet. In the region where the central absorption portion, the surface-side absorbent sheet, and the back-side absorbent sheet are laminated, the absorption capacity per unit area of the central absorption portion is larger than the absorption capacity per unit area of each of the surface-side absorbent sheet and the back-side absorbent sheet. The absorbent article according to any one of claims 1 to 6.

8. The central absorption portion includes a high fiber presence portion having a high content of the fiber material and a low fiber presence portion having a lower content of the fiber material than the high fiber presence portion. The absorbent article according to any one of claims 1 to 7, wherein the water-soluble antibacterial agent, the porous material, and the polyphenol compound are contained in the low fiber presence portion.

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