Title - SANITARY TOWEL COMPRISING A WATER-SOLUBLE FORMULATION

Abstract

A sanitary napkin (1), such as a feminine pad, comprising a fluid-permeable upper sheet (2) and a lower sheet (3), the sanitary napkin (1) extending in a longitudinal direction (L) and a transverse direction (T) and having first and second longitudinal side edges (5, 6) and a front and a back edge (7, 8), the sanitary napkin (1) having a length (l) extending in the longitudinal direction (L) and measured along the longitudinal centerline (Lc) of the sanitary napkin (1) and a maximum width (Wm), as measured in the transverse direction (T), the sanitary napkin (1) being composed of a front third (9), a back third (10) and a middle third (11) disposed between the front and back thirds (9, 10), as viewed in the longitudinal direction (L),The top sheet (2) is provided with a water-soluble formulation applied to a coated zone (12) disposed along the rear edge (8) and the first and second longitudinal side edges (5, 6) in the rear third (10) of the sanitary napkin (1), forming a demarcation in the rear third (10) that delimits an inner rear zone (13) comprising or consisting of an area of ​​top sheet free of coating, the inner rear zone (13) extending along the longitudinal centerline (Lc), the coated zone (12) being disposed at a distance from the rear edge (8) and the first and second longitudinal side edges (5, 6) and covering 25%, optionally 30%, or 50% of the total surface area of ​​the top sheet (2) in the rear third (10) of the sanitary napkin (1).

Description

SANITARY TOWEL COMPRISING A WATER-SOLUBLE FORMULATION TECHNICAL FIELD The disclosure pertains to a sanitary napkin, such as a sanitary napkin, feminine pad, diaper, or incontinence pad, comprising an upper sheet and a lower sheet, the upper sheet comprising a water-soluble formulation applied to a coated area. BACKGROUND Sanitary napkins of the type to which this disclosure pertains are worn in contact with the skin and consist of a layer with a top and bottom sheet. The use of products applied in direct contact with the skin can produce unwanted side effects. This can occur as a result of occlusion, moisture, mechanical, microbial, and enzymatic factors that interact with each other to varying degrees, increasing their influence and potentially causing different forms of skin irritation in users of such products. During frequent loss of bodily fluids and frequent use of disposable sanitary napkins, the skin can become irritated, reddened, and rough to the touch. Creams, formulations, or ointments can be used to provide an artificial hydrophobic barrier on the skin. However, the use of such hydrophobic compositions negatively impacts the performance of absorbent products. To avoid this side effect, hydrophobic compositions are often applied in relatively small amounts and in various patterns on the top sheet, such as in elongated strips running parallel to the top sheet. Thinner, smaller sanitary pads, such as panty liners, can also be used more frequently, sometimes daily, which can also cause occlusion and increased mechanical stress on the skin. Thinner, smaller sanitary pads may also have more flexible front and back cross edges and side edges, primarily located near the groin area. This can result in the edges of such products folding, twisting, or creasing more, which can cause discomfort and affect product performance. Furthermore, sanitary pads, which are relatively two-dimensional compared to thicker, more three-dimensional pads, have 239187 2160859 of 14 a greater tendency to shift in relation to the user's skin, resulting in a greater risk of friction against the skin compared to a product that includes, for example, a bulge in the crotch portion and is shaped to fit more closely to the user's anatomy. The additional application of creams, formulations, and ointments to the skin often presents a complication and discomfort. Frequently, these products are not used preventively and are only applied when visible signs of skin irritation appear, such as diaper rash. In view of the above, there is a desire to provide a comfortable sanitary napkin that avoids skin irritation and provides benefits to the skin while maintaining satisfactory performance properties. SUMMARY OF THE INVENTION One or more of the aforementioned objectives can be achieved with a sanitary napkin according to claim 1. Additional embodiments are presented in the dependent claims, in the description that follows, and in the drawings. A sanitary napkin, such as a feminine hygiene pad, as disclosed herein, comprises a fluid-permeable top sheet and a bottom sheet. The sanitary napkin extends in a longitudinal and a transverse direction and has a first and a second longitudinal side edge, as well as a front and a back edge. The sanitary napkin has a length extending in the longitudinal direction, measured along the longitudinal centerline of the sanitary napkin, and a maximum width, measured in the transverse direction. The sanitary napkin is composed of a front third, a back third, and a middle third disposed between the front and back thirds, as observed in the longitudinal direction.The top sheet is provided with a water-soluble formulation applied to a coating zone along the rear edge and the first and second longitudinal side edges in the rear third of the sanitary napkin, forming a demarcation in the rear third that delimits an inner rear zone comprising or consisting of an area of ​​the top sheet free of coating. The inner rear zone extends along the longitudinal centerline in the rear third of the sanitary napkin. The coated zone is positioned at a distance from the rear edge and from the first and second longitudinal side edges and covers at least 25%, 35%, or at least 50% of the total surface area of ​​the top sheet in the rear third of the sanitary napkin. 239187 2160859 of 14 Optionally, the coated area covers a range of between 25% and 80% of the total surface area of ​​the top sheet in the back third of the sanitary napkin. Optionally, the coated area covers a range of between 35% and 75% of the total surface area of ​​the top sheet in the back third of the sanitary napkin. The term “sanitary napkin” refers to a product that is placed against the user’s skin in the groin area to absorb and contain bodily exudates, such as vaginal discharge, urine, and menstrual fluid. This disclosure primarily refers to disposable sanitary napkins, meaning items that are not intended to be washed, restored, or otherwise reused as a sanitary napkin. Examples of disposable sanitary napkins include feminine hygiene products such as sanitary pads, panty liners, incontinence pads, and similar items. During use, sanitary napkins remain in contact with the user's skin. The moist environment between the top sheet and the skin, resulting from frequent leakage during use, can increase friction and lead to skin irritation and disruption of the skin barrier. This disclosure is based on the inventors' finding that the area of ​​the sanitary napkin in closest contact with the user's skin is the area along the back edge and the first and second longitudinal edges in the back third of the napkin, not the central area. It was also found that the area in closest contact with the skin does not include the edges themselves. Therefore, it is beneficial to provide this area with a water-soluble, friction-reducing, and skin-friendly formulation, while the inner back area comprises or consists of an uncoated top sheet area. The fact that the coated area is provided at a distance from the back edge and the first and second longitudinal side edges prevents soiling of underwear due to edge folding.This is particularly important given that the present disclosure pertains to a sanitary napkin with the edges located closer to the crotch area compared to, for example, a diaper. The distance from the coated area to both the back edge and the first and second longitudinal edges can be 1 mm or more, optionally within the range of 1 mm to 18 mm, optionally within the range of 1 mm to 15 mm, or within the range of 1 mm to 10 mm. The fact that the coated area is positioned at a distance from the edge prevents the formulation from soiling the underwear if the edges are folded during use. 239187 2160859 of 14 The sanitary napkin may comprise an absorbent core disposed between the top and bottom sheets. The sanitary napkin may also comprise an area free of an absorbent core at the front, back, and longitudinal edges where the top and bottom sheets are connected directly or via an acquisition layer. The absorber core may have a generally uniform unloaded thickness throughout its entire length. Alternatively, the absorber core may consist of a single absorbent layer, thus also having a uniform unloaded thickness. Alternatively, the absorbent core may comprise two or more absorbent layers, each of which may have the same extent, both longitudinally and transversely. Since the outer edges of each absorbent layer coincide when viewed from the user-facing side of the towel, the thickness of the absorbent core is uniform. The covered area may be located along the front edge, the first and second longitudinal side edges in the anterior third of the sanitary napkin, with the covered area positioned at a distance from the front edge, the first and second longitudinal side edges in the anterior third of the sanitary napkin. This sanitary napkin provides benefits to the skin in both the anterior and posterior regions of the user. The coated zone may form a demarcation in the anterior third, and the inner anterior zone comprises or consists of an area with a top sheet free of coating. The inner anterior zone may extend along the longitudinal centerline. The coated zone in the anterior third covers at least 25%, 35%, or 50% of the total surface area of ​​the top sheet in the anterior third of the sanitary napkin. Optionally, the coated area on the anterior third of the sanitary napkin covers a range of between 25% and 80% of the total surface area of ​​the top sheet on the anterior third of the sanitary napkin. Alternatively, the coated area on the anterior third of the sanitary napkin covers a range of between 35% and 70% of the total surface area of ​​the top sheet on the anterior third of the sanitary napkin. The fact that the covered area is provided at a distance from the back edge and the first and second longitudinal side edges prevents soiling of the underwear due to twisting, folding or creasing of the edges. 239187 2160859 of 14 The distance from the covered area to both the front edge and the first and second longitudinal edges may be 1 mm or more, optionally within the range of 1 mm to 18 mm, or 1 mm to 15 mm. The coated zone may be arranged along the first and second longitudinal side edges in the middle third of the sanitary napkin. This coated zone is positioned at a distance from the first and second longitudinal side edges in the middle third of the sanitary napkin and forms a demarcation in the middle third that defines an inner center zone comprising or consisting of an area of ​​the top sheet free of coating. The inner center zone free of coating extends along the longitudinal center line. Optionally, the inner center zone free of coating covers at least 40% of the total area of ​​the top sheet in the middle third of the sanitary napkin. This provides enhanced benefits to the skin in the user's groin area while maintaining the absorbency of the sanitary napkin in the central groin region.According to this embodiment, the coated area is arranged to provide an outer border in the middle third of the sanitary napkin, delimiting an uncoated inner central zone. The coated area may cover at least 25%, or at least 35%, or at least 50% of the total surface area of ​​the top sheet in the middle third of the sanitary napkin. Optionally, the coated area covers a range of between 25% and 80%, such as a range of between 35% and 75%, of the total surface area of ​​the top sheet in the middle third of the sanitary article. The distance from the covered area to the first and second longitudinal edge can be 1 mm or more, optionally within the range of 1 mm to 18 mm. The length of the sanitary napkin can range from 100 to 300 mm, or from 100 to 260 mm. Shorter sanitary napkins may carry a greater risk of creasing of the edges, as the front and back edges are located closer to the user's groin area, where the risk of creases, folds, or twists of the napkin edges is higher. The maximum width of the sanitary napkin can range from 35 mm to 110 mm. Narrower sanitary napkins may carry a greater risk of creasing at the edges, as the longitudinal edges are located closer to the user's groin area, where creasing is most likely. If a formulation is applied to the edges, there is a risk of soiling underwear. 239187 2160859 of 14 towel is provided with wings, i.e., two wing-shaped fastening elements that extend outwards from the main body to allow the towel to be attached to underwear; the width of the wings is excluded when measuring the maximum width of the sanitary towel. The amount of formulation in the coated area may be within the range of 0.2 grams per m2, or 0.5 grams per m2 to 7 grams per m2, or 0.5 grams per m2 to 3 grams per m2. The inventors hereof found that in a sanitary napkin, when the coated area is provided in accordance with the present disclosure, such amounts of formulation are particularly suitable for the intended purpose. The water-soluble formulation may comprise, for example, allantoin and / or betaine. The water-soluble formulation may comprise a water-miscible vehicle, such as glycerin, propylene glycol, and / or PEG. The water-soluble formulation may be oil-free and emulsifier-free; alternatively, the water-soluble formulation could be oil-free and / or contain non-encapsulated emulsifiers. The water-soluble formulation can be applied within the coated area in an amount ranging from 0.2 to 12 grams per square meter, optionally in an amount ranging from 0.5 to 7 grams per square meter, or in an amount ranging from 0.5 to 3.0 square meters. The aqueous formulation can be added to the top sheet before assembling the sanitary ware or to the top sheet of the assembled sanitary ware, either before or after cutting the individual sanitary ware. The top sheet can be dried after application of the aqueous formulation, and the coating quantity is measured after the top sheet has dried, so that the coating quantity defined in this application is the coating quantity on the item during use. After the drying step, the coating can be a dry coating. The formulation can be continuously applied to the coated area.Alternatively, the formulation can be applied discontinuously, such as with a pattern of dots or strips. The uncoated zone, defined by an inner contour of the coated zone, can form a head region, a body region, and a neck region. The neck region forms a transition zone between the head and body regions. The head region is positioned on the anterior half of the sanitary napkin, and the body region is positioned on both the anterior and posterior halves. The transverse width of the uncoated zone in the neck region is less than the maximum transverse width of the head region. This provides a zone 239187 2160859 of 14 increased coverage in the groin area which may be an area in close contact with the sanitary napkin and, therefore, particularly exposed to friction, and thus take advantage of the beneficial action on the skin of the water-soluble formulation. The top sheet may include a second side opposite the first. This second side of the top sheet is printed in a patterned area, and the coated area on the first side of the top sheet may overlap fully or partially with the printed area, as viewed in a depth direction perpendicular to the longitudinal direction. This provides the user with a visual indication of the location of the water-soluble coating, which can guide the user in positioning the towel and also signal the presence of the skin-beneficial formulation. The printing may be in different colors or different shades of the same color. It is also possible to have one printed area to visualize the presence of the skin-beneficial coating and another printed area to visualize, for example, the central moisturizing area. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be explained in detail below by means of non-limiting examples and with reference to the accompanying drawings, where: Figure 1 illustrates a perspective view of a sanitary napkin in accordance with this disclosure. Fig. 2 is a plan view of the sanitary napkin in Fig. 1. Fig. 3 is an exploded view of the sanitary napkin from Fig. 1. Fig. 4 is a top plan view of a sanitary napkin in accordance with this disclosure. DETAILED DESCRIPTION It should be understood that the drawings are schematic and that individual components, such as layers of material, are not necessarily drawn to scale. The sanitary napkin shown in the figures is provided as an example only and should not be considered a limitation of the invention as disclosed herein. 239187 2160859 of 14 Figures 1-3 show a sanitary napkin 1 according to the present disclosure. The sanitary napkin 1 comprises an upper sheet 2 and a lower sheet 3. An absorbent core 4 is disposed between the upper sheet 2 and the lower sheet 3. The upper sheet 2 has a user-facing side 2a and a user-facing side 2b. A sanitary napkin can be any feminine hygiene product such as sanitary pads, panty liners, incontinence pads, diapers, and similar items. Diapers can be open-backed diapers or pull-up diapers. The sanitary napkin 1 extends in a longitudinal direction L and a transverse direction T and has a first longitudinal side edge 5, a second longitudinal side edge 6, a front edge 7, and a back edge 8. The sanitary napkin 1 has a length 1, extending in the longitudinal direction L and measured along a longitudinal centerline Lc of the sanitary napkin 1, and a maximum width Wm, as measured in the transverse direction T. The sanitary napkin 1 comprises a front third 9, a back third 10, and a middle third 11 situated between the front third 9 and the back third 10, as viewed in the longitudinal direction L. The top sheet 2 is provided with a water-soluble formulation. The water-soluble formulation is applied to a coated area 12 situated along the back edge 8 and the first and second longitudinal side edges 5 and 6 in the back third 10 of the sanitary napkin 1.The coated zone 12 forms a demarcation in the rear third, delimiting an inner rear zone 13 comprising or consisting of an area of ​​upper sheet free of coating. The inner back zone 13 extends along the longitudinal centerline Lc. The coated zone 12 is positioned at a distance d from the back edge 8 and from the first and second longitudinal side edges 5, 6. The coated zone covers between 25% and 80% of the total surface area of ​​the top sheet in the back third of the sanitary napkin. Optionally, the coated zone covers between 35% and 75% of the total surface area of ​​the top sheet in the back third of the sanitary napkin. The coated zone 12 forms a demarcation in the anterior third, delimiting an internal anterior zone 14 that comprises or consists of an area of ​​upper sheet free of coating. The internal anterior zone 14 extends along the longitudinal centerline Lc. The covered zone 12 is further arranged along the first and second longitudinal lateral edges 5, 6 in the central third 11 of the sanitary napkin 1. The covered zone 12 is arranged at a distance from the first and second longitudinal lateral edges 5, 6 in the 239187 2160859 of 14 central third 11 of the sanitary napkin 1 and forms a demarcation in the central third 11 delimiting, on a respective lateral side of this, an interior central zone 15 comprising or consisting of an area of ​​upper sheet free of coating. The distance d from the coated area 12 to the back edge 8 can be within the range of 1 mm to 18 mm, or from 1 mm to 15 mm. The distance d from the coated area 12 to the first and second longitudinal edges 5, 6 can also be within the range of 1 mm to 18 mm. This is advantageous during production when the final sanitary napkins are cut and prevents soiling underwear if the edges fold over during use. Sanitary napkin 1 in Fig. 2 has a length I within the range of 100 to 300 mm. This is therefore a smaller type of sanitary napkin, such as a panty liner. The maximum width Wm of sanitary napkin 1 is within the range of 35 to 110 mm. In the case of smaller sanitary napkins, such as panty liners, the risk of edge creasing may increase because the edges are closer to the groin area. This can lead to increased mechanical forces acting on the edges of the sanitary napkin, such as leg movement, sitting, and changing position. The amount of formulation in the coated area is within the range of 0.2 grams per m2 to 12 grams per m2, or 0.5 grams per m2 to 7 grams per m2, or 0.5 grams per m2 to 3 grams per m2. These amounts were found to be particularly suitable for the intended purposes. The formulation can be provided continuously in the coated area 12. However, the formulation can also be provided discontinuously, for example, in strips, dots, or a combination of these. In Fig. 2, the inner anterior zone 14, inner posterior zone 13, and inner central zone 15 form a non-coated zone, which is defined by an inner contour of the coated zone 12. The non-coated zone forms a head region 18, a body region 19, and a neck region 20. The neck region 20 forms a transition region between the head region 18 and the body region 19. The head region 18 is positioned on the anterior half of the sanitary napkin 1, and the body region 19 is positioned on both the anterior and posterior halves of the sanitary napkin 1. A width 239187 2160859 of 14 transverse of the free zone of coating in the neck region is less than a maximum transverse width of the head region. In Figs. 1-3, the top sheet 2 is printed with printing elements 21 provided in a printed area 22. The printing elements 21 are printed on the second side 2b of the top sheet 2, that is, on the side opposite the side on which the coated area 12 is provided. The printed area 22 overlaps and correlates with the coated area 12, as viewed in a depth direction, perpendicular to the longitudinal direction. For example, an outline of the outer line of the printed area 22 may correspond to an outline of the outer line of the coated area 12. This can give the user a visual indication of where the formulation is located, which can indicate how to position the article, and also signal the presence of the skin-beneficial formulation. In Figs.1 and 2 also present an interior zone free of coating and printing that lacks printing and formulation. The top layer may include or consist of one or more layers of nonwoven fibers, which may be continuous filaments, meltblown fibers, carded fibers, hydrointerlaced fibers, or wet-laid fibers. Suitable nonwoven materials may be composed of natural fibers, such as wood pulp or cotton fibers, thermoplastic synthetic fibers, such as polyolefins, polyesters, polyamides, and combinations thereof, or blends of natural and synthetic fibers. Suitable top layers should be soft, non-irritating to the skin, and readily permeable to bodily fluids, such as menstrual fluid and urine. The formulation may be applied by any suitable method or combination of methods, such as coating, die-cutting, spraying, roll coating, dipping, or printing. The bottom layer 3 can consist of a thin plastic film, for example, a polyethylene or polypropylene film, a nonwoven material coated with a liquid-impermeable material, or a hydrophobic nonwoven material, all of which resist liquid penetration. Laminates of plastic films and nonwoven materials can also be used. The bottom layer material can be breathable to allow vapor to be released from the absorbent structure while preventing liquid from passing through the bottom layer material. The absorbent core 4 constitutes the absorbent structure of the article where bodily fluids are collected and stored. The absorbent core can be of any type. 239187 2160859 of 14 conventional. Examples of commonly used absorbent materials are cellulose fluff pulp, tissue paper, highly absorbent polymers (so-called superabsorbents), absorbent foam materials, absorbent nonwoven materials, or similar materials. It is common to combine cellulose fluff pulp with superabsorbent polymers in an absorbent core. Superabsorbent polymers are organic or inorganic materials, impermeable to water, insoluble in water, capable of absorbing at least approximately 20 times their own weight of an aqueous solution containing 0.9 percent by weight of sodium chloride. Generally, the core can be a unitary construction, which can, for example, simplify the manufacturing process. The phrase “unitary construction” in the context of this document means that the absorbent core is essentially constructed from one type of material, which is essentially the same material, or essentially the same combination of two or more materials, throughout the entire absorbent core. Variations in the density and concentration of the material may occur, but these are limited to those obtainable by incorporating regions that have been formed separately and then physically bonded together. For example, when the absorbent core comprises a matrix of hydrophilic fibers and superabsorbent material, as described above, the relative concentrations of superabsorbent material and fibers may differ in different parts of the core.However, the absorbent core of the unit construction does not comprise layers or laminates with different compositions. Variations in the density or concentration of various components are acceptable along the longitudinal, transverse, or thickness direction of the absorbent core, but the core must not comprise areas or layers with different compositions that are formed separately and then bonded together. A suitable technique for manufacturing the absorbent cores described herein is mesh formation through an air-laying process. In this process, an air-permeable mold is provided. The fibrous material is air-layed into the mold, and the mold is filled, thus producing an absorbent core with the desired amount of fibrous material. The sanitary napkin 1 may optionally comprise an acquisition layer disposed between the absorbent core 4 and the top sheet 2 and bonded to the top sheet 2 at least by means of embossing. However, it may also be bonded to the top sheet with adhesive. The liquid acquisition layer is adapted to quickly receive and temporarily store the discharged liquid before it is absorbed by the absorbent core 4. Such acquisition distribution layers may 239187 2160859 of 14 may be composed, for example, of air-laid nonwoven materials, hydro-bonded nonwoven materials, or expanded nonwoven or foamed materials. The nonwoven material may be hydrophilic. A hydrophilic material can be obtained by adding a surfactant. An air-laid nonwoven material can be produced using fluff or wood pulp. In this process, the fluff fibers are dispersed in a fast-moving air stream and condensed on a moving screen by pressure and vacuum. The network can be bonded with resin and / or thermoplastic resin dispersed within the pulp. The network can be heat-sealed, latex-bonded, multi-sealed (a combination of heat and latex sealing), or mechanically bonded (high pressure and temperature, hydrogen bonding). The appropriate basis weight of the air-laid nonwoven material can range from 35 to 100 grams per square meter. An expanded material is a nonwoven material and may be substantially free of absorbent fibers and superabsorbent material. Expanded nonwoven material may comprise thermoplastic polymer fibers and may be selected from, among others, polyesters, polyamides, and polyolefins such as polyethylene (PE) and polypropylene (PP), and may be a blend of any of these. Expanded material refers to thick, low-density fabrics, as opposed to flat, paper-like fabrics. Expanded networks are characterized by a relatively low density. This means that there is a relatively high amount of empty space between the fibers. Figure 4 illustrates a sanitary napkin 1 according to this disclosure. The sanitary napkin 1 comprises a top sheet 2, a bottom sheet 3, and an absorbent core 4 located between the top sheet 2 and the bottom sheet 3. The sanitary napkin 1 extends in a longitudinal direction L and a transverse direction T and has a first longitudinal side edge 5, a second longitudinal side edge 6, a front edge 7, and a back edge 8. The sanitary napkin 1 has a length I extending in the longitudinal direction L, measured along the longitudinal centerline Lc of the sanitary napkin 1, and a maximum width Wm, measured in the transverse direction T. The sanitary napkin 1 comprises an anterior third 9, a posterior third 10, and a central third 11 arranged between the anterior third 9 and the posterior third 10, as seen in the longitudinal direction L. The upper sheet 2 is provided with a water-soluble formulation. The water-soluble formulation is applied to a coated zone 12 arranged along the posterior edge 8 and the first and second longitudinal lateral edges 5, 6 in the posterior third 11 of the sanitary napkin 1. The coated zone 12 forms a demarcation in the posterior third, defining an inner posterior zone 13 comprising or consisting of a 239187 2160859 of 14 top sheet area free of coating. The coated zone 12 is arranged at a distance d from the rear edge 8 and from the first and second longitudinal side edges 5, 6. The covered zone 12 further forms a demarcation in the anterior third 9 that delimits an internal anterior zone 14, which extends along the longitudinal centerline Lc and comprises or consists of an area of ​​top sheet free of coating, and in the central third 11 of the sanitary napkin 1 delimiting an internal central zone 15 that comprises or consists of an area of ​​top sheet free of coating, third 11 that delimits, on a respective side thereof, an internal central zone 15. The distance d from the coated area 12 to both the anterior and posterior edges 7, 8, and the first and second longitudinal edges 5, 6, is 2 mm or more, optionally within the range of 1 mm to 18 mm. This is advantageous during production when the final sanitary napkins are cut and prevents soiling of underwear if the edges fold over during use. In the sanitary napkin 1 illustrated in Figure 4, the distance d between the first and second longitudinal edges 5, 6 and the coated area 12 is greater than in the anterior third 9 and the middle third 11 of sanitary napkin 1. 239187 2160859 of 14 20225952036 CRISTIAN DANIEL BITTEL - 20225952036 Digitally signed by PORTALTRAMITES - INPI Date: 2023.02.14 15:48:33 -03:00 Reason: Digitally signed by the INPI Location: Buenos Aires, Argentina 2160859

Claims

1. A sanitary napkin (1), such as a feminine pad, comprising a fluid-permeable upper sheet (2) and a lower sheet (3), the sanitary napkin (1) extending in a longitudinal direction (L) and a transverse direction (T) and having first and second longitudinal side edges (5, 6) and a front and a back edge (7, 8), the sanitary napkin (1) having a length (l) extending in the longitudinal direction (L) and measured along the longitudinal centerline (Lc) of the sanitary napkin (1) and a maximum width (Wm), as measured in the transverse direction (T), the sanitary napkin (1) being composed of a front third (9), a back third (10) and a middle third (11) disposed between the front and back thirds (9, 10), as seen in the longitudinal direction (L),The top sheet (2) is provided with a water-soluble formulation characterized in that the water-soluble formulation is applied to a coated zone (12) disposed along the rear edge (8) and the first and second longitudinal side edges (5, 6) in the rear third (10) of the sanitary napkin (1), forming a demarcation in the rear third (10) that delimits an inner rear zone (13) comprising or consisting of an area of ​​top sheet free of coating, the inner rear zone (13) extending along the longitudinal centerline (Lc), the coated zone (12) being disposed at a distance from the rear edge (8) and the first and second longitudinal side edges (5, 6) and covering 25%, optionally 35%, or 50% of the total surface area of ​​the top sheet (2) in the rear third (10) of the sanitary napkin (1). Sixteen claims follow.