阅读说明：本技术 防漏片 (Leak-proof sheet ) 是由 深山拓也 坂口智 于 2017-12-19 设计创作，主要内容包括：本发明提供一种防漏片。提供一种具有针对尿的良好的憎水性和针对软便的良好的疏油性的一次性吸收性物品。一次性尿布具有吸收要素(40)、透液性的表面片(50)以及防漏片(55)。防漏片具有由纤维的平均直径是0.5μm～10μm的无纺布构成的憎水层(56)。憎水层具有在纤维的表面附着有微粒组的憎水区域。微粒组具有：第1微粒,其平均粒径是1μm～20μm；以及第2微粒,其附着于第1微粒上,且平均粒径是5nm～100nm。(The invention provides a leakproof sheet. Provided is a disposable absorbent article having excellent water repellency for urine and excellent oil repellency for soft feces. The disposable diaper has an absorbent element (40), a liquid-permeable topsheet (50), and a leakproof sheet (55). The leakproof sheet has a water repellent layer (56) made of a nonwoven fabric having fibers with an average diameter of 0.5 to 10 μm. The water repellent layer has a water repellent region having a group of particles attached to the surface of the fiber. The microparticle group has: 1 st fine particles having an average particle diameter of 1 to 20 μm; and 2 nd fine particles attached to the 1 st fine particles and having an average particle diameter of 5nm to 100 nm.)

1. A leakage-preventive sheet used for an absorbent article including an absorbent element for absorbing body fluid, characterized in that,

the leakage-preventing sheet has a water-repellent layer made of a nonwoven fabric having fibers with an average diameter of 0.5 to 10 μm,

the hydrophobic layer has a hydrophobic region with a set of particles attached to the surface of the fiber,

the set of microparticles has: 1 st fine particles having an average particle diameter of 1 to 20 μm; and 2 nd fine particles which are adhered to the 1 st fine particles and have an average particle diameter of 5nm to 100 nm.

2. The leak-proof sheet of claim 1,

the leakage preventive sheet has a protective layer disposed on the outer side of the water repellent layer in the thickness direction,

the protective layer is composed of a nonwoven fabric having an average fiber diameter of 10 [ mu ] m or more.

3. Leakage prevention sheet according to claim 1 or 2,

at least a part of the water repellent region is disposed in a central region located at the center in the thickness direction of the water repellent layer by trisecting the water repellent layer in the thickness direction.

4. The leak-proof sheet of claim 2,

the protective layer has the fine particle group, and the gram weight of the fine particle group of the water repellent layer is higher than that of the fine particle group of the protective layer.

5. Leakage prevention sheet according to claim 1 or 2,

the distance between the fibers in the hydrophobic layer is 50 [ mu ] m or less.

6. Leakage prevention sheet according to claim 1 or 2,

the hydrophobic layer has a contact angle greater than 135 ° with respect to water and oil.

7. Leakage prevention sheet according to claim 1 or 2,

the surface tension of the water-repellent layer is 30mN/m or less.

Technical Field

The present invention relates to a disposable absorbent article having a leakproof sheet.

Background

Conventionally, a disposable absorbent article including a nonwoven fabric treated by applying a hydrophobic surface coating is known (for example, see patent document 1).

Disclosure of Invention

The hydrophobic surface coating of patent document 1 contains at least two silicone polymers. In general, the surface tension (surface free energy) of silicone (Japanese: シリコン) is 16 to 30mN/m, the surface tension of water is 73mN/m, and the surface tension of oil is 25 to 30 mN/m. Here, the following features are provided: the larger the difference in surface tension between the two, the greater the water repellency (i.e., well hydrophobic).

Therefore, the nonwoven fabric used in the disposable absorbent article disclosed in patent document 1 has good water repellency for urine, but does not have good oil repellency for oily loose feces. Therefore, the disposable absorbent article of patent document 1 has the following problems: the soft feces permeate the non-woven fabric and exude.

Accordingly, an object of the present invention is to provide a disposable absorbent article having good water repellency for urine and good oil repellency for loose stool.

Means for solving the problems

The disposable absorbent article of the present invention has: a front-back direction and a width direction orthogonal to each other; a thickness direction extending toward a skin-facing surface side and a non-skin-facing surface side of a wearer; an absorbing element; a liquid-permeable top sheet disposed on the skin-facing surface side of the absorbent element; and a leakage-preventive sheet disposed at least either one of a position on the outer side in the thickness direction than the absorbent element and a position on the outer side in the width direction than the absorbent element, wherein the leakage-preventive sheet has a water-repellent layer made of a nonwoven fabric having fibers with an average diameter of 0.5 to 10 μm, the water-repellent layer has a water-repellent region in which a group of particles is attached to the surface of the fibers, and the group of particles has: 1 st fine particles having an average particle diameter of 1 to 20 μm; and 2 nd fine particles which are adhered to the 1 st fine particles and have an average particle diameter of 5nm to 100 nm.

Drawings

Fig. 1 is a developed plan view of the disposable diaper of the present embodiment.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a cross-sectional view schematically showing a cross-section of the leak-proof sheet.

Fig. 4 is a view schematically showing the structure of the particle group and the fiber.

Detailed Description

At least the following matters will be made clear from the description of the present specification and the drawings.

A disposable absorbent article having:

a front-back direction and a width direction orthogonal to each other;

a thickness direction extending toward a skin-facing surface side and a non-skin-facing surface side of a wearer;

an absorbing element;

a liquid-permeable top sheet disposed on the skin-facing surface side of the absorbent element; and

a leakproof sheet arranged at least either one of a position on the outer side of the thickness direction with respect to the absorbent element or a position on the outer side of the width direction with respect to the absorbent element, the disposable absorbent article being characterized in that,

the leakage-preventing sheet has a water-repellent layer made of a nonwoven fabric having fibers with an average diameter of 0.5 to 10 μm,

the hydrophobic layer has a hydrophobic region with a set of particles attached to the surface of the fiber,

the set of microparticles has: 1 st fine particles having an average particle diameter of 1 to 20 μm; and 2 nd fine particles which are adhered to the 1 st fine particles and have an average particle diameter of 5nm to 100 nm.

The water-repellent layer of the leak-proof sheet is composed of a nonwoven fabric having an average fiber diameter of 0.5 to 10 μm. Since the fibers have an average diameter of 0.5 to 10 μm, the fibers are easily densely arranged and urine and soft feces are less likely to permeate through the gaps between the fibers. The water-repellent layer has a water-repellent region in which fine particle groups are attached to the surface of the fiber. The microparticle group has: 1 st fine particles having an average particle diameter of 1 to 20 μm; and 2 nd fine particles attached to the 1 st fine particles and having an average particle diameter of 5nm to 100 nm. Therefore, the surface of the fiber of the water repellent layer is formed with the uneven shape of the 1 st fine particle, and the 1 st fine particle is formed with the uneven shape of the 2 nd fine particle. The two-stage uneven shape is formed by the fine particles having different particle diameters, and urine and loose feces which are going to pass between the fibers come into contact with the fine particle group attached to the surface of the fibers, and are difficult to pass through the gaps between the fibers of the fine particle group. Therefore, the leakproof sheet can exhibit excellent water repellency against urine and excellent oil repellency against loose stool.

In the absorbent article, it is desirable that,

the leakage preventive sheet has a protective layer disposed outside the water repellent layer in the thickness direction,

the protective layer is composed of a nonwoven fabric having an average fiber diameter of 10 [ mu ] m or more.

According to such an absorbent article, the outer surface of the water repellent layer in the thickness direction can be protected by the protective layer, and the shape of the fine particle group in the water repellent layer can be easily maintained. Therefore, even when the surface of the leakproof sheet is rubbed during distribution or use, the water repellent performance of the water repellent layer can be maintained, and excellent water repellent performance against urine and excellent oil repellent performance against loose stool can be exhibited. The average particle diameter of the fibers constituting the protective layer is 10 μm or more, which is higher than the average particle diameter of the fibers of the water repellent layer. Therefore, the fibers of the protective layer are more likely to be arranged sparsely than the fibers of the water-repellent layer. The protective layer has a higher cushioning property than the water repellent layer, and the protective layer can easily protect the structure of the fine particle group of the water repellent layer. Further, since the fibers of the protective layer are arranged more sparsely than the fibers of the water repellent layer, urine and soft feces are easily taken in. According to the leakage preventive sheet thus configured, urine and soft feces can be rapidly introduced through the protective layer, the introduced body fluid is made less likely to permeate through the water repellent layer, and the introduced body fluid is retained in the water repellent layer. The introduction of body fluid can be improved, leakage of body fluid can be suppressed, and the wearing feeling can be improved.

In the absorbent article, it is desirable that,

at least a part of the water repellent region is disposed in a central region located at the center in the thickness direction of the water repellent layer by trisecting the water repellent layer in the thickness direction.

According to such an absorbent article, the outer surface in the thickness direction of the central region can be protected by the region outside in the thickness direction of the central region, and the shape of the particle group in the central region can be easily maintained. Therefore, even when the surface of the water repellent layer is rubbed during distribution or use, the water repellent performance of the central region of the water repellent layer can be maintained, and excellent water repellent properties for urine and excellent oil repellent properties for soft feces can be exhibited.

In the absorbent article, it is preferable that,

an uneven region having convex portions protruding toward the skin-facing surface and concave portions provided between the convex portions is provided on at least one of the front sheet and the back sheet disposed on a side other than the skin-facing surface with respect to the absorbent element,

the uneven region is disposed so as to overlap with the water repellent region in the thickness direction.

According to such an absorbent article, when an external force is applied to the absorbent article, the concave portions and the concave portions in the concave-convex regions deform, and the external force can be suppressed from being transmitted to the leakproof sheet. Since the uneven regions are arranged so as to overlap the water repellent region, the shape of the particle group in the water repellent region can be easily maintained. Therefore, the leakproof sheet can exhibit excellent water repellency against urine and excellent oil repellency against loose stool.

In the absorbent article, it is desirable that,

the front sheet and the back sheet provided with the embossed regions are joined to the leakage preventive sheet in a discontinuous manner.

According to such an absorbent article, the following portions are provided: a part where the sheet provided with the concavo-convex area is joined with the leakproof sheet; the sheet provided with the concave-convex region and the leakage-preventing sheet are not joined. The portion where the sheet provided with the concavo-convex region and the leakproof sheet are not joined is more easily deformed than the joined portion. Therefore, when an external force acts on the absorbent article, the external force can be absorbed by the portion where the sheet provided with the uneven region and the leakproof sheet are not joined, and the transmission of the external force to the leakproof sheet can be suppressed. Therefore, the shape of the fine particle group of the water repellent layer is easily maintained, and excellent water repellent properties against urine and excellent oil repellent properties against loose stool can be exhibited.

In the absorbent article, it is preferable that,

the water repellent region is preferably disposed so as to cover the entire region of the absorbent element at a position closer to the non-skin-facing surface side than the absorbent element.

In the absorbent article, the water repellent region is disposed so as to cover the entire surface of the non-skin surface side of the absorbent element, and the water repellency of the non-skin surface side of the absorbent element can be exhibited by the water repellent region. An absorbent article having no back sheet and having water repellency on the side of the absorbent element not facing the skin, which is ensured by the leakage-preventing sheet, can be provided. Generally, a back sheet of an absorbent article is made of a film, and has lower flexibility than a leakage-preventing sheet made of nonwoven fabric, and may give a feeling of discomfort or generate a noise of friction when deformed. According to the absorbent article having no back sheet, the uncomfortable feeling during deformation and the sound during deformation can be reduced, and the wearing feeling can be improved.

In the absorbent article, it is preferable that,

the water repellent region is disposed on the non-skin-facing surface side of the absorbent element so as to cover a portion of the absorbent element located on the rear side of the center of the disposable absorbent article in the front-rear direction.

The region on the rear side of the center in the front-rear direction is a region which is in contact with the rear side of the crotch of the body and from which the urine is discharged. According to such an absorbent article, the water repellent region is disposed so as to cover a portion of the absorbent element located on the rear side of the center in the front-rear direction, and leakage prevention performance with respect to feces can be exhibited by the water repellent region. An absorbent article having no back sheet and having a leakage-preventing sheet for ensuring leakage prevention on the side of the absorbent element not facing the skin can be provided. Generally, the back sheet is made of a film, and has lower flexibility than a leakproof sheet made of nonwoven fabric, and may give a feeling of discomfort or generate a noise of rubbing when deformed. According to the absorbent article having no back sheet, the uncomfortable feeling during deformation and the sound during deformation can be reduced, and the wearing feeling can be improved.

In the absorbent article, it is desirable that,

the gram weight of the particle group of the hydrophobic layer is higher than that of the particle group of the protective layer.

According to such an absorbent article, since the gram weight of the fine particle group in the water-repellent layer is high, the shape of many fine particle groups is maintained in the water-repellent layer protected by the protective layer, and the water-repellent layer has good water-repellent properties and oil-repellent properties.

In the absorbent article, it is desirable that,

the distance between the fibers in the hydrophobic layer is 50 [ mu ] m or less.

According to such an absorbent article, urine and loose stool are less likely to permeate through the gaps between the fibers. Therefore, the leakage-preventing sheet can improve leakage-preventing performance.

In the absorbent article, it is desirable that,

the hydrophobic layer has a contact angle greater than 135 ° with respect to water and oil.

According to such an absorbent article, the water repellent layer has a contact angle with water and oil larger than 135 °, and has excellent water repellency and oil repellency.

In the absorbent article, it is desirable that,

the surface tension of the water-repellent layer is 30mN/m or less.

According to such an absorbent article, since the difference between the surface tension of the water-repellent layer and the surface tension of water is large and the difference between the surface tension of the water-repellent layer and the surface tension of oil is large, excellent leakage prevention performance can be exhibited against urine and soft feces.

In the absorbent article, it is desirable that,

the leakage-preventing sheet constitutes at least either of the three-dimensional gather and the leg gather.

According to such an absorbent article, the three-dimensional gathers and the leg gathers are formed of a nonwoven fabric, instead of the three-dimensional gathers and the leg gathers being formed of a film having leakage-proof properties, and leakage-proof properties against urine and soft feces can be exhibited by the nonwoven fabric. The three-dimensional gathers and the leg gathers are arranged so as to contact the skin of the wearer, and are made of a nonwoven fabric, so that the contact with the skin can be alleviated, and the wearing feeling of the wearer can be improved.

The disposable absorbent article of the present embodiment may be used as a disposable absorbent article for a disposable

Next, an embodiment of a disposable diaper 10 as a disposable absorbent article of the present invention will be described with reference to the drawings. The disposable absorbent article of the present invention is not limited to a disposable diaper, and is a disposable absorbent article including an absorbent pad that can be attached and fixed to underwear or a diaper. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and it should be noted that the ratio of the respective dimensions and the like are different from the actual ratio of the respective dimensions and the like. Therefore, specific dimensions and the like should be determined with reference to the following description. In addition, the drawings may include portions having different dimensional relationships and ratios from each other.

(1) Overall schematic structure of disposable diaper

Fig. 1 is a developed plan view of a disposable diaper 10 of the present embodiment. The developed plan view shown in fig. 1 is a view showing an extended state in which the stretchable portions of the three-dimensional gathers are extended to a state in which no wrinkles are formed in the topsheet 50, the side sheet 70, and the like constituting the disposable diaper. Fig. 2 is a sectional view taken along line a-a shown in fig. 1.

The disposable diaper 10 has a front waistline region 20, a crotch region 25, and a rear waistline region 30. The front waistline region 20 is a portion that contacts the front waistline portion (abdomen portion) of the wearer. The back waistline region 30 is a portion that contacts the back waistline portion (back portion) of the wearer. The crotch region 25 is located between the front waistline region 20 and the rear waistline region 30. In the present embodiment, the direction from the front waistline region 20 to the rear waistline region 30 is referred to as the front-rear direction L, the direction perpendicular to the front-rear direction L is referred to as the width direction W, and the direction extending toward the skin-facing surface side T1 and the non-skin-facing surface side T2 of the wearer is referred to as the thickness direction T.

The disposable diaper 10 has an absorbent element 40. The absorbent element 40 spans the crotch region 25 and extends toward at least one of the front waistline region 20 and the back waistline region 30. The absorbent element 40 of the present embodiment is disposed across the front waistline region 20, the crotch region 25, and the rear waistline region 30. The absorbent element 40 has an absorbent core containing absorbent materials such as pulp and SAP.

The liquid-permeable top sheet 50 is provided on the skin-facing surface side T1 of the absorbent element 40. The topsheet 50 constitutes a skin contact surface of the disposable diaper 10 and contacts the wearer. The topsheet 50 is disposed across the front waistline region 20, the crotch region 25, and the rear waistline region 30. The top sheet 50 has fibers, and specifically, can be made of a nonwoven fabric.

The surface sheet 50 has a lead-in region R13. The introduction region R13 is a region in which soft feces are highly introduced into the absorbent element side compared to the surrounding region. Specifically, the drawn region R13 can be exemplified by a region in which an opening penetrating along the thickness direction T is formed, a region in which convex portions protruding toward the skin-facing surface side and concave portions provided between the convex portions are alternately formed. The introduction region R13 having the opening can introduce loose stool on the skin-facing surface of the surface sheet to the non-skin-facing surface side of the surface sheet through the opening. In addition, the introduction region in which the convex portions and the concave portions are formed can hold loose stool by the concave portions between the convex portions, and the loose stool in the concave portions can be quickly guided to the non-skin-facing surface side. In addition, the recessed portion is surrounded by the grid-like protruding portions in the drawn-in region where the protruding portions are formed in the grid-like shape, so that the loose stool is suppressed from spreading to the periphery, and the loose stool in the recessed portion can be quickly guided to the non-skin-facing surface side. The lead-in region is disposed so as to overlap with a water repellent region described later in the thickness direction. The pull-in region is disposed on the rear side of the center in the front-rear direction of the absorbent article, and more specifically, is disposed in the rear waist region. The introduction region is provided in a region for discharge.

The leakage-preventing sheet 55 is disposed on the non-skin-facing surface side of the absorbent element 40. The leakproof sheet 55 constitutes a non-skin-facing surface of the disposable diaper. The leak-proof sheet 55 has water repellency and oil repellency. The structure of the leakage preventing sheet 55 will be described in detail later.

A pair of three-dimensional gathers 80 are disposed on both outer sides in the width direction of the disposable diaper 10 with respect to the center in the width direction. The three-dimensional gather 80 is composed of the side sheet 70 and the side elastic member 71 as an elastic member.

The side sheet 70 covers the outer edge of the surface sheet. A side elastic member 71 that expands and contracts in the front-rear direction is disposed on the inner edge side of the side sheet 70. The three-dimensional gather 80 has a standing portion that can stand up toward the wearer by the side elastic member 71 that expands and contracts in the front-rear direction. The three-dimensional gathers 80 form walls that stand up toward the skin side at the outer edges of the absorbent element 40, and prevent leakage of excrement from the sides.

Leg gathers 90 arranged around the legs of the wearer are formed at the outer edge of the disposable diaper 10. The leg gathers 90 are composed of the side sheet 70, leg elastic members 92, and barrier sheet 55. The leg elastic members 92 are disposed between the side sheet 70 and the leakage preventive sheet 55 in a state of being extended in the front-rear direction. The leg gathers 90 are sealed to the leg cuffs at the outer edges of the absorbent element 40 to prevent side leakage of excrement.

(2) Detailed structure of leakage-proof sheet

Next, the leakage preventing sheet 55 will be explained. Fig. 3 is a cross-sectional view schematically showing the leakproof sheet. The leakproof sheet 55 is arranged on the non-skin-facing surface side T2 on the outer side in the thickness direction T than the absorbent element 40. The leakproof sheet 55 may be disposed at a position on the skin-facing surface side T1 with respect to the absorbent element 40, or may be disposed at a position on the outer side in the width direction W with respect to the absorbent element 40.

As shown in fig. 3, the leakproof sheet 55 is composed of 3 layers of the water repellent layer 56 and the protective layer 57 disposed on the skin surface side T1 and the non-skin surface side T2 of the water repellent layer 56. The leakage preventive sheet 55 is made of SMS nonwoven fabric, the water repellent layer 56 is made of melt-blown nonwoven fabric, and the protective layer 57 is made of spun-bonded nonwoven fabric.

The water-repellent layer 56 is located at the center of the leak preventive sheet 55 in the thickness direction T. The fibers of the water repellent layer 56 are made of fibers containing at least one of polypropylene and polyethylene terephthalate. The hydrophobic layer 56 has a fiber basis weight of 12gsm and an average fiber diameter of 0.5 to 10 μm. The distance between the fibers of the water-repellent layer 56 is 50 μm or less.

The hydrophobic layer 56 has hydrophobic regions with groups of particles 60 attached to the surface of the fibers. The water repellent region in the present embodiment is provided over the entire water repellent layer 56 in a plan view. The water-repellent region is preferably provided in a region overlapping the absorbent element 40, and may not be provided at the outer edge of the disposable diaper 10, or may not be provided at the front end edge and the rear end edge of the disposable diaper 10. The water-repellent region may be disposed at a position closer to the non-skin-facing surface side T2 than the absorbent element 40 so as to cover a portion of the absorbent element 40 located closer to the rear side than the center in the front-rear direction of the absorbent article. The water repellent region may be disposed in a region overlapping the lead-in region R13 of the surface sheet 50.

As shown in fig. 4, the microparticle group 60 has: 1 st fine particles 61 having an average particle diameter of 1 to 20 μm; and 2 nd fine particles 62 attached to the 1 st fine particles 61 and having an average particle diameter of 5nm to 100 nm. As the 1 st fine particles 61, resin particles made of olefin resin can be exemplified. Further, as the 2 nd fine particles 62, oxide fine particles can be exemplified. The 2 nd fine particles are dispersed and adhered to the surfaces of the 1 st fine particles 61. Fine irregularities composed of the 1 st fine particles 61 are formed on the surface of the fiber constituting the water-repellent layer 56, and fine irregularities composed of the 2 nd fine particles 62 are also formed on the surface of the fine irregularities. Such a surface shape improves the water repellency and oil repellency of the surface.

The average particle size of the fine particles can be measured by a scanning electron microscope (FE-SEM), and when the resolution of the scanning electron microscope is low, the measurement can be performed by using another electron microscope such as a transmission electron microscope. Specifically, the particle shape is the diameter when it is spherical, and the average of the longest diameter and the shortest diameter when it is non-spherical is taken as the diameter, and the average of the diameters of 20 particles arbitrarily selected by observation with a scanning electron microscope or the like is taken as the primary particle average diameter.

The method of attaching the 1 st particles 61 and the 2 nd particles 62 to the surface of the fiber is not particularly limited. For example, the 1 st particles 61 may be formed into a film shape by applying a coating material in which the 1 st particles 61 and the 2 nd particles 62 are dispersed in a solvent to a nonwoven fabric and drying the coating material, and the 2 nd particles 62 may be dispersed and adhered to the surface of the film shape.

The protective layers 57 are located on both outer sides in the thickness direction T of the water-repellent layer 56. The fibers of the protective layer 57 are made of fibers containing at least one of polypropylene and polyethylene terephthalate. The grammage of the fibers of the protective layer 57 is 6gsm, and the average diameter of the fibers is 12 μm to 22 μm. Preferably, the average diameter of the fibers of the protective layer 57 is larger than 10 μm and larger than the average diameter of the fibers of the water-repellent layer 56. A group of particles 60 is also attached to the surface of the fibers that make up the water-repellent layer 56. The structure of the particle group 60 is the same as that of the particle group of the water-repellent layer 56.

The grammage of the particle group 60 of the water-repellent layer 56 is higher than the grammage of the particle group 60 of the protective layer 57. The grammage of the fine particle group 60 of the water-repellent layer 56 in the present embodiment is 2gsm, and the grammage of the fine particle group of the protective layer 57 is 1 gsm.

The surface tension of the water-repellent layer 56 and the surface tension of the leak-proof sheet 55 including the protective layer 57 are preferably 30mN/m or less, and more preferably 20mN/m or less. Further, the Surface tension can be measured at 25 ℃ using an Automatic Surface tensiometercB VP-Z (manufactured by Kyowa interface science Co., Ltd.). The contact angle of the water-repellent layer 56 with respect to water and oil is preferably larger than 135 °, and the contact angle of the leak-proof sheet 55 including the protective layer 57 may be larger than 135 °. In addition, as the contact angle, a surface disposed on the non-skin-facing surface side was used as a test surface, and a contact angle with respect to pure water and a contact angle with respect to oil were measured using a contact angle measuring apparatus (solid-liquid interface analyzer "Drop Master 300", manufactured by interfacial chemical co., ltd.).

(3) Other embodiments

The leakage-preventing sheet of the above embodiment has a protective layer, but the leakage-preventing sheet of the present invention may not have a protective layer. In the leak-proof sheet having no protective layer, at least a part of the water repellent region is preferably disposed in a central region located at the center in the thickness direction of the water repellent layer by trisecting the water repellent layer in the thickness direction.

The absorbent article may have a back sheet on the non-skin-facing side of the leakproof sheet. The back sheet includes a non-skin-facing surface of the absorbent article and is positioned on the non-skin-facing surface side of the absorbent element and the leakage preventive sheet. The back sheet may also be provided with embossed regions. In addition, the back sheet provided with the concave-convex area is preferably joined to the leakproof sheet in a discontinuous manner. Specifically, it is preferable that a region where the leak-proof sheet and the back sheet are bonded to each other and a region where the leak-proof sheet and the back sheet are not bonded to each other are alternately arranged. In the structure in which the surface sheet provided with the uneven region and the leakproof sheet are overlapped in the thickness direction, the surface sheet and the leakproof sheet are preferably bonded discontinuously.

As described above, the contents of the present invention are disclosed by the embodiments of the present invention, but it should not be understood that the discussion and the drawings constituting a part of the disclosure serve to limit the present invention. Various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art in view of this disclosure. Accordingly, the scope of the invention should be determined only by the specific features of the claims that are reasonably summarized from the above description.

The contents of japanese patent application No. 2017-012426 filed on 26/1/2017 are incorporated herein by reference in their entirety.

Industrial applicability

A disposable absorbent article having excellent water repellency for urine and excellent oil repellency for soft feces can be provided.

Description of the reference numerals

10. Disposable diapers (disposable absorbent articles); 40. an absorbing element; 50. a surface sheet; 55. a leakproof sheet; 56. a hydrophobic layer; 57. a protective layer; 60. a set of microparticles; 61. 1 st particle; 62. 2 nd fine particles; 80. three-dimensional pleating; 90. a leg gather; r13, introduction region.