WO2017209073A1 - Absorbent article - Google Patents

Abstract

An absorbent article (1) for the absorption of menstrual bleeding that is provided with a liquid-permeable front sheet (2) forming a skin-facing surface, a back sheet (3) forming a non-skin-facing surface, and an absorbent body (4) disposed between the front and back sheets, and that has a longitudinal direction (X) along the front-back direction of the wearer of the absorbent article and a transverse direction (Y) perpendicular to the longitudinal direction, the front sheet (2) comprising a textured nonwoven fabric (10) having projections and recesses in at least the skin-facing surface side, and a blood coagulant being included in a lower member (42a) such as a core wrapping sheet disposed in a position which is closer to the back sheet (3) than the front sheet (2).

Description

Absorbent articles

The present invention relates to an absorbent article for menstrual blood absorption.

A technique is known in which a fluid treatment agent that acts on blood is applied to an absorbent article to improve the menstrual blood absorption performance of the absorbent article (for example, Patent Documents 1 to 3).
Patent Document 1 discloses a menstrual band including an absorbent pad containing a salt of multivalent ions. Patent Document 2 discloses a napkin containing a partially hydrated dicarboxylic anhydride copolymer or polycation as a blood gelling agent. Patent Document 3 proposes a personal care absorbent article containing a triblock polymer or polycation containing polypropylene oxide and polyethylene oxide as a fluid treatment material.

The applicant previously proposed an absorbent article containing a blood coagulant containing a water-soluble metal compound in an absorbent core (see Patent Document 4).

Japanese Patent Publication No. 38-17449 JP-A-57-153648 Special table 2002-528232 gazette Japanese Patent Laying-Open No. 2005-287997

The present invention includes a liquid-permeable surface sheet that forms a skin-facing surface, a back sheet that forms a non-skin-facing surface, and an absorbent body disposed between the two sheets, and a longitudinal direction along the wearer's front-rear direction. And an absorbent article for menstrual blood absorption having a transverse direction perpendicular to the longitudinal direction. The said surface sheet consists of an uneven | corrugated nonwoven fabric which has an unevenness | corrugation in the skin opposing surface side at least. A hemagglutinating agent is contained in the lower member disposed at a position closer to the back sheet than the non-skin facing surface of the top sheet.

FIG. 1 is a plan view of a sanitary napkin according to an embodiment of the absorbent article of the present invention as viewed from the skin facing surface side. FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG. FIG. 3 is a perspective view showing an uneven nonwoven fabric used as a surface sheet of a sanitary napkin according to an embodiment of the present invention. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. FIG. 5: is a perspective view which shows the other uneven | corrugated nonwoven fabric which can be used as a surface sheet of the sanitary napkin which is embodiment of this invention. 6 is a schematic cross-sectional view taken along line VI-VI in FIG.

Detailed Description of the Invention

Patent Documents 1 and 4 do not disclose the application state of the fluid treatment agent in the absorbent article except that a water-soluble metal compound is used as the blood coagulant. When a blood coagulant is placed on the surface sheet that forms the skin facing surface of the absorbent article or the surface of the absorbent body adjacent to the surface sheet, red blood cell aggregates may form on the skin facing surface side of the surface sheet. There was a risk of moving to the surface and adhering to the wearer's skin. Red blood cell agglomerates are highly viscous and sticky, so if they adhere to the skin of the wearer, it will lead to deterioration of the feeling of wear and skin problems around the excretory part. On the other hand, the absorbent articles described in Patent Document 2 and Patent Document 3 can agglutinate red blood cell components, but menstrual blood that is continuously discharged is absorbed later in the menstrual mass by the aggregate formed in the initial stage. Although it is described that fluid treatment agents containing polycations can be used, only data on nonionic treatment materials are disclosed. Also, in these technologies, the absorption of blood into the absorber is hindered due to a decrease in liquid permeability due to blood cell aggregates at the part facing the excretion spot part of the absorbent article, and it takes time to absorb the blood. In addition, it is difficult to guarantee blood absorption by the mechanism continuously, and this is disadvantageous in terms of so-called liquid return, in which blood returns to the skin side during use.

The problem of the present invention relates to providing an absorbent article that can solve the problems of the prior art.

Hereinafter, an absorbent article for menstrual blood absorption according to the present invention will be described based on preferred embodiments with reference to the drawings. Absorbent articles for menstrual blood absorption are included in sanitary products.
The absorbent article of the present invention includes a liquid-permeable surface sheet that forms a skin-facing surface, a back sheet that forms a non-skin-facing surface, and an absorbent body disposed between these two sheets, and the wearer's front-back direction The absorbent article for absorbing menstrual blood has a longitudinal direction X along the transverse direction Y and a transverse direction Y perpendicular to the longitudinal direction, preferably a sanitary napkin.

A sanitary napkin 1 (hereinafter also referred to as napkin 1) according to an embodiment of the present invention includes a liquid-permeable surface sheet 2 and a non-skin facing surface that form a skin facing surface, as shown in FIGS. A back sheet 3 to be formed and a liquid retaining absorbent 4 disposed between the two sheets 2 and 3 are provided. The top sheet 2, the absorber 4 and the back sheet 3 are integrated to form an absorbent main body 5. Side leakproof sheets 6 are arranged on the surface sheet 2 side on both sides in the longitudinal direction of the absorbent main body 5. The side leak-proof sheet 6 has a free end 61 that is not joined to the top sheet 2 and a fixed end 62 that is joined to the top sheet 2, and is used between the fixed end 62 and the free end 61 when used. Forms a leak-proof pocket (not shown) that separates from the top sheet 2 and prevents lateral leakage to the side. A main body adhesive portion (not shown) used for fixing to the crotch portion of the shorts is provided on the non-skin facing surface of the absorbent main body 5. The napkin 1 has a pair of wing portions 7 on both side portions in the longitudinal direction X. On the surface of the pair of wing portions 7 on the back sheet 3 side, a wing adhesive portion (not shown) used for fixing the crotch portion of the shorts to the non-skin facing surface is provided.

As shown in FIG. 1, the napkin 1 has a longitudinal direction X corresponding to the wearer's front-rear direction and a lateral direction Y orthogonal to the longitudinal direction X. Further, the napkin 1 has an excretion part facing part (intermediate part) B having an excretion spot part P disposed opposite the wearer's liquid excretion part such as the vaginal opening in the width direction (lateral direction) Y central part with respect to the vertical direction X. And the front part A that is arranged closer to the abdomen (front side) of the wearer than the excretion part facing part B, and the closer to the back side (rear side) of the wearer than the excretion part facing part B. And a rear portion C. That is, the napkin 1 is divided into the front part A, the excretion part opposing part B, and the rear part C in this order in the vertical direction X.

In the absorbent article of the present invention, the skin-facing surface is a surface that faces the wearer's skin when the napkin 1 is worn in the napkin 1 or its constituent members (for example, the surface sheet 2 and the absorbent core 41). The skin-facing surface is a surface of the napkin 1 or its constituent members that is directed to the side opposite to the skin side (usually the clothing side) when the napkin 1 is worn. The excretion spot part P is a part that is disposed opposite to the liquid excretion part of the wearer when the absorbent article such as the napkin 1 is worn, and is directly supplied with menstrual blood. It is located at the center in the vertical direction X and the width direction Y of B.

In the absorbent article of the present invention, the excretory part-facing part B is a region having one wing part in the longitudinal direction X of the absorbent article (one side) It means a region sandwiched between a root along the vertical direction X of the wing portion and a root along the vertical direction X of the other wing portion. Further, when the absorbent article does not have a wing portion, two folding lines (when the absorbent article is folded into a three-fold individual form, crossing the absorbent article in the lateral direction Y ( (Not shown) means a region surrounded by a first folding line and a second folding line as counted from the front end in the longitudinal direction X of the absorbent article.

In the napkin 1, the top sheet 2 covers the whole area of the absorbent body 4 facing the skin, and the back sheet 3 covers the whole area of the absorbent body 4 not facing the skin. The surface sheet 2 and the back surface sheet 3 are joined to each other at the extended portions from both end edges in the longitudinal direction X of the absorber 4. Further, the back sheet 3 and the side leak-proof sheet 6 are joined to each other at portions extending outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorber 4. In this way, the absorbent body 4 is sandwiched between the top sheet 2 and the back sheet 3, and the top sheet 2 and the back sheet 3 are joined around the entire outer edge of the napkin 1. For joining between the sheets constituting the napkin 1, any joining means such as an adhesive, heat sealing, ultrasonic sealing or the like is used.

The absorbent article of the present invention has a surface sheet made of an uneven nonwoven fabric having unevenness at least on the skin facing surface side as the surface sheet. The napkin 1 of this embodiment is provided with the surface sheet which consists of an uneven | corrugated nonwoven fabric as described in (1) below as a surface sheet which consists of an uneven | corrugated nonwoven fabric which has an unevenness | corrugation at least on the skin opposing surface side.

(1) An uneven nonwoven fabric in which the insides of uneven projections are solid and the projections are arranged in a dotted pattern in plan view.
Examples of the uneven nonwoven fabric of (1) include, but are not limited to, the uneven nonwoven fabric 10 shown in FIGS. 3 and 4 and the uneven nonwoven fabric formed using heat-stretched fibers.
The uneven nonwoven fabric 10 shown in FIG. 3 and FIG. 4 has a lower fiber layer 22 containing heat-shrinkable heat-shrinkable fibers and an upper fiber layer 23 made of non-heat-shrinkable fibers. 23 is partly heat-sealed in a large number of heat-sealing portions 24 and integrated in the thickness direction. The heat fusion part 24 is formed in a dotted shape in the planar direction of the top sheet 2. The uneven nonwoven fabric 10 consists of a lower fiber layer 22 containing heat-shrinkable fibers and a non-heat-shrinkable fiber, or an upper fiber layer containing less heat-shrinkable fibers than the lower fiber layer 22 during its production. 23, and partially heat-sealing them by heat sealing, ultrasonic sealing or the like, then subjecting the laminated body to hot air treatment, and lower layers in the region surrounded by the four heat-sealing portions 24 The fiber layer 22 is heat-shrinked and the upper fiber layer 23 is protruded to the skin facing surface side to form a large number of convex portions 25.
In the plan view of the uneven nonwoven fabric 10 or the absorbent article in which the uneven nonwoven fabric 10 is incorporated, the convex portions 25 and the concave portions 26 centered on the heat fusion portion 24 are each formed in a dotted shape, and more specifically, It is formed in a staggered pattern. The inside of each convex part 25 is solid as shown in FIG. The uneven nonwoven fabric 10 has an uneven shape on the surface on the upper fiber layer 23 side, while the surface on the lower fiber layer 22 side facing the absorber side is flat or uneven as compared with the surface on the upper fiber layer 23 side. The height difference is less than half. The uneven nonwoven fabric 10 is incorporated in an absorbent article such as the napkin 1 with the upper fiber layer 23 side having an uneven shape facing the skin facing surface side and the lower fiber layer 22 side facing the absorbent body 4 side.

As the heat-shrinkable fibers for shrinking the lower fiber layer 22, known ones can be used without particular limitation, and it is more preferable to use latent crimpable fibers. The latent crimpable fiber is one that develops a helical crimp by heat treatment and shrinks, for example, an eccentric core-sheath type composite fiber or side-by-side type composite containing two types of thermoplastic polymer materials having different shrinkage rates as components. Made of fiber. Examples thereof include those described in JP-A-9-296325 and Japanese Patent No. 2759331. As an example of two types of thermoplastic polymer materials having different shrinkage rates, for example, a combination of an ethylene-propylene random copolymer (EP) and polypropylene (PP) is preferably exemplified. The lower fiber layer 22 may be composed of 100% heat-shrinkable fibers and may contain other fibers. When other fibers are included, the amount of the heat-shrinkable fibers is preferably 50% by mass or more, particularly 70 to 90% by mass with respect to the mass of the lower fiber layer 22. The non-heat-shrinkable fibers contained in the upper fiber layer 23 include fibers that do not exhibit heat-shrinkability and heat-shrinkability, but are substantially below the heat-shrinkage start temperature of the heat-shrinkable fibers contained in the lower fiber layer. Examples thereof include fibers that do not heat shrink. In addition, the upper fiber layer 23 includes a heat-fusible fiber containing a heat-sealing resin having a melting point T _M higher than the heat shrinkage start temperature T _S of the heat-shrinkable fiber contained in the lower fiber layer 22. preferable. The heat-sealing fiber is contained in an amount of preferably 70% by mass or more, and more preferably 80% by mass or more with respect to the mass of the upper fiber layer 23 based on the mass of the heat-sealing resin. Most preferably, the non-heat-shrinkable fibers constituting the upper fiber layer 23 are composed of 100% by mass of the heat-sealing fibers.

In the concavo-convex nonwoven fabric 10, the lower fiber layer 22 is thermally contracted to increase the density, while the upper fiber layer 23 forms a convex portion 25 due to the thermal contraction of the lower fiber layer 22, and accordingly, the upper fiber layer 23. The density tends to decrease rather. Therefore, as shown in FIG. 4, when the fiber density of the upper fiber layer 23 is compared in the plane direction of the topsheet 2, the fiber density in the vicinity of the concave portion 26 is the highest and is higher than the fiber density of the top portion 25 t of the convex portion. ing. The vicinity of the concave portion 26 is the heat fusion portion 24 or the vicinity thereof.

The uneven nonwoven fabric 10A shown in FIG. 5 and FIG. 6 is an example of an uneven nonwoven fabric formed using heat-stretched fibers, and is an uneven nonwoven fabric preferably used as a surface sheet.
5 and 6, the skin facing surface 10 a of the uneven nonwoven fabric 10 </ b> A has recesses 12 extending in a direction intersecting with the longitudinal direction X and the lateral direction Y of the napkin 1 in an oblique lattice shape. The uneven nonwoven fabric 10A is partitioned into a large number of regions by the portion 12, and a large number of partitioned regions 13 are formed.

The uneven nonwoven fabric 10A is made of a fiber sheet such as a nonwoven fabric having a single layer structure or a multilayer structure, and is preferably treated with a hydrophilizing agent. As shown in FIG. 5, the skin facing surface 10 a of the uneven nonwoven fabric 10 </ b> A has recesses 12 formed in an oblique lattice shape and an uneven shape having a large number of protrusions 11 formed in a region surrounded by the recesses 12. have. The non-skin facing surface 10b of the uneven nonwoven fabric 10A does not substantially have an uneven shape and is substantially flat. In the uneven nonwoven fabric 10A, the recess 12 is a recess.

The hollow portion 12 is formed by pressing or bonding constituent fibers of a fiber sheet. Examples of means for crimping the fiber include embossing such as pressing with or without heat, and ultrasonic pressing. As a result, in the uneven nonwoven fabric 10 </ b> A, the density of the recesses 12 is higher than the density of the protrusions 11. That is, the dent 12 is a high-density portion having a relatively high density in the uneven nonwoven fabric 10A, and the protrusion 11 is a low-density portion having a relatively low density in the uneven nonwoven fabric 10A. The recess 12 in the uneven nonwoven fabric 10A is formed, for example, by subjecting a fiber web formed by a card method to heat embossing, and the heat-fusible fibers that are constituent fibers are integrated by heat-sealing.

The uneven nonwoven fabric 10A shown in FIG. 5 and FIG. 6 is formed as a plurality of first linear depressions 12a formed in parallel to each other at a predetermined interval as depressions 12 in parallel to each other at a predetermined interval. A plurality of second linear depressions 12b, and the first linear depressions 12a and the second linear depressions 12b cross each other at a predetermined angle. . Each of the first linear depression 12a and the second linear depression 12b extends linearly in a direction intersecting with the vertical direction X and the horizontal direction Y, respectively. The width of the first linear depression 12a and the width of the second linear depression 12b may be the same or different. The interval between the first linear depressions 12a and the interval between the second linear depressions 12b may be the same or different.

Each partition region 13 is a region surrounded by a linear depression 12 and preferably has a quadrangular shape, more preferably a square or rhombus shape. Area of each divided area 13 is preferably, for example, 0.25 cm ² or more 2 cm ² or less. When the partition region 13 has a rhombus shape, the partition region 13 may have a rhombus shape that is longer in the horizontal direction Y than the vertical direction X in plan view, or may have a rhombus shape that is longer in the vertical direction X than the horizontal direction Y. .

Each partition region 13 is formed with a convex portion 11 that protrudes relative to the recess 12 surrounding the partition region 13. The inside of the convex part 11 is filled with the constituent fibers of the concave-convex nonwoven fabric 10A, and has a solid structure. Compared to the case where the partition region 13 and the convex portion 11 are surrounded by the hollow portion 10 and closed in plan view, the partition region 13 and the convex portion 11 are not surrounded by the hollow portion 1. It becomes easy to extend in the thickness direction of the nonwoven fabric or fiber web, and the convex portion 11 having a large height difference is formed.

The recess 12 is preferably linear in plan view. Here, the “linear” is not limited to a straight line as shown in FIG. 5 but includes a curved line, and each line may be a continuous line, or a large number of rectangles, squares, rhombuses, circles, crosses and the like in a plan view. Concave portions (embossed portions, high-density portions) may be connected substantially without any interval to form a continuous line as a whole. “Substantially without an interval” means that the interval between adjacent recesses is within 5 mm.

In the uneven nonwoven fabric 10, 10A, the width W11 of the protrusion 25 or the protrusion 11 along the longitudinal direction X of the napkin 1 is preferably 0.5 mm or more, more preferably 0.8 mm or more, and preferably 10. It is 0 mm or less, More preferably, it is 8.0 mm or less, Preferably it is 0.5 mm or more and 10.0 mm or less, More preferably, it is 0.8 mm or more and 8.0 mm or less.
Moreover, as for the uneven | corrugated nonwoven fabric 10 and 10A, the width W12 of the recessed part 26 or the hollow part 12 becomes like this. Preferably it is 0.2 mm or more, More preferably, it is 0.4 mm or more, Preferably it is 3.0 mm or less, More preferably, 2 0.0 mm or less, preferably 0.2 mm or more and 3.0 mm or less, more preferably 0.4 mm or more and 2.0 mm or less. Further, in the uneven nonwoven fabric 10, 10A, the distance L11 between the convex portions 25 or the convex portions 11 in a plan view is preferably 0.5 mm or more, more preferably 0.8 mm or more, and preferably 10.0 mm. It is below, More preferably, it is 8.0 mm or less, Preferably it is 0.5 mm or more and 10.0 mm or less, More preferably, it is 0.8 mm or more and 8.0 mm or less. By setting the width W11 of the convex portions 25, 11 of the uneven nonwoven fabric 10, 10A, the width W12 of the concave portion 26 or the recessed portion 12, and the distance L11 between the convex portions 25, 11 within this range, the liquid absorption speed and absorption during use While the amount is improved, it is excellent in absorption performance such as suppressing liquid return from the absorber. Furthermore, the air permeability between the absorbent article and the user's skin can be improved and an appropriate cushioning property can be realized.

Regarding the thickness of the uneven nonwoven fabric 10, 10A, the thickness T11 of the protrusion 25 or the protrusion 11 when the uneven nonwoven fabric 10, 10A is viewed from the side is preferably 1.0 mm or more, more preferably 1.5 mm or more. Preferably, it is 7.0 mm or less, more preferably 5.0 mm or less, preferably 1.0 mm or more and 7.0 mm or less, and more preferably 1.5 mm or more and 5.0 mm or less. It is. Moreover, as for the uneven | corrugated nonwoven fabrics 10 and 10A, the thickness T12 of the recessed part 26 or the hollow part 12 becomes like this. Preferably it is 0.1 mm or more, More preferably, it is 0.4 mm or more, Preferably it is 3.0 mm or less, More preferably, 2 0.0 mm or less, preferably 0.2 mm or more and 3.0 mm or less, more preferably 0.4 mm or more and 2.0 mm or less. By setting the thickness of the concavo- convex nonwoven fabric 10, 10A within this range, the body fluid absorption rate during use is further increased and the absorption amount is improved, while the absorption performance such as suppressing liquid return from the absorber is excellent. Furthermore, moderate cushioning properties can be realized.

The above-described uneven nonwoven fabric 10A is obtained by forming the depression 12 in a single layer or multilayer raw material sheet containing heat stretchable fibers as constituent fibers and then stretching the heat stretchable fibers by heat treatment. As the uneven nonwoven fabric formed using heat-stretched fibers, those described in JP 2010-150686 A can also be used.

It has an upper layer on the skin-facing surface side containing heat-extensible fibers and a lower layer on the non-skin-facing surface side that does not contain heat-extensible fibers or is contained at a lower rate than the upper layer, and these are heat-sealed, ultrasonic-sealed, etc. After partially joining by the well-known joining method, the laminate may be subjected to hot air treatment, and the thermally stretchable fiber contained in the upper layer may be thermally stretched to form a convex portion. Examples of the uneven nonwoven fabric having such a structure include those described in JP 2010-115479 A and JP 2010-148730 A.

The one described in JP 2010-115479 A is a two-layered surface sheet having an upper layer on the skin facing surface side and a lower layer on the non-skin facing surface side, and the upper layer is formed using heat-extensible fibers. And the lower layer includes no heat-extensible fibers or contains heat-extensible fibers in a lower proportion than the upper layer, and the upper layer skin. The opposing surface side has an uneven shape. Further, the interface between the upper layer and the lower layer has a fixed portion joined to each other and a non-fixed portion in which the upper layer and the lower layer are detachably laminated so that the liquid passes due to the formation of a large gap. It is preferable from the point of having an effect of improving the properties.

Moreover, from the viewpoint of making it difficult for the liquid in the surface sheet 10 to remain, whether the uneven nonwoven fabric 10 has substantially the same average diameter of the fibers constituting the upper layer and the average diameter of the fibers constituting the lower layer after fiber elongation. Or it is preferable that the average diameter of the fiber which comprises the said lower layer is larger than the average diameter of the fiber which comprises the said upper layer. The average fiber diameter of the constituent fibers of the uneven nonwoven fabric 10, particularly the heat-stretched fibers contained in the upper layer, is preferably 10 μm or more and 30 μm or less. Furthermore, it is preferable that the distance between the fibers in the upper layer is larger than the distance between the fibers in the lower layer. When the average fiber diameter measured by the following method is compared, the average diameter of the fibers is substantially the same as the ratio of the average diameter of the fibers constituting the upper layer to the average diameter of the fibers constituting the lower layer (the former / The latter) is 0.9 to 1.1.

<Measuring method of average diameter of constituent fibers>
The average diameter of the constituent fibers was measured by one of two methods that differ depending on the cross-sectional shape of the fibers. For the measurement, “Carry Scope JCM-5100” manufactured by JEOL Ltd. was used.
First, the cross-sectional contour shape of the constituent fibers was confirmed at a magnification of 500 to 1000 times. At this time, not only the cross-sectional contour of the fiber, but also the core-sheath structure fiber / single fiber, the core component / sheath component area ratio, and the type of fiber (differentiated by thickness, shape, etc.) are grasped. (Measure 5 to 10 different cross sections)
The first method is a measurement method in the case where the cross section is formed only with a fiber having a circular cross section, and an arbitrary 20 excluding the fiber fusion part from a 200-500 times plane enlarged image of each of the five upper and lower layers. The thickness of the fibers of the book is measured and averaged to obtain the “average diameter of the constituent fibers”.
The second method is a measurement method in the case where a fiber having a non-circular cross section is included, and an enlarged image with a magnification of 500 to 1000 times for measuring the cross-sectional contour shape of the fiber is used. The cross-sectional area of one fiber cut at approximately 90 degrees is calculated by a means capable of calculating the area such as an image analyzer, and the area is regarded as a circle and the diameter is set as the fiber diameter. Image observation with an electron microscope is performed until the cross-sectional observation result of such a single fiber reaches 50, and the average value of the 50 is defined as “average diameter of constituent fibers”.
As an image analysis apparatus for measuring the area of the cross section of the fiber, for example, image analysis software NEW QUABE (ver. 4.20) manufactured by NEXTUS can be used.

The inter-fiber distance (gap between fibers) is the difference between the inter-fiber distance of the upper layer and the inter-fiber distance of the lower layer (the former-the latter) when the inter-fiber distance measured by the following method is compared. The thickness is preferably 0 μm or more from the viewpoint of liquid movement, and is preferably 0 μm or more and 50 μm or less from the viewpoint of the strength and feel of the topsheet.
<Measurement method of distance between fibers>
The following Wrotnowski equation was used.

Here, the packing density and fineness (denier) of the fiber are measured as follows.
The fiber packing density is measured by the following procedure.
The area ratio of the linear embossing is calculated from the planar image on the surface side of the surface sheet. In calculation, it is preferable to measure about 20 linear embossments at a time. Next, the length of the vertical direction and the horizontal direction and the weight of the rectangular surface sheet whose weight is measured are measured. The basis weight (g / m ² ) is calculated from the weight of the topsheet and the lengths in the vertical and horizontal directions. In the calculation, the area factor of the linear emboss is corrected. Calculate the area of the linear emboss from the area of the surface sheet obtained by multiplying the length in the vertical direction and the horizontal direction, calculate the linear embossed part in the weight of the surface sheet, and when calculating the basis weight of the upper layer, Use the area obtained by subtracting the linear embossed portion from the area, and use the area. Next, the cross-sectional area of the top sheet is measured. An electron microscope is preferably used for measurement, but an optical device such as Keyence's digital high scope VH8000 may be used. The enlarged image includes the tops of the convex portions from the linear embossed portions. When the convex portions have different heights, each cross-sectional image is observed. The packing density can be calculated by dividing the basis weight (g / m ² ) by the height (m), but the substantial basis weight is the same from the linear embossed portion to the convex portion as in the present invention. When the height changes, the average height is calculated from the cross-sectional area of the surface sheet, and “average fiber height” is obtained as the “height” at the time of calculation. The cross-sectional area is obtained by measuring the portion excluding the linear embossed portion with an image analysis apparatus and dividing the length between the linear embossed portions excluding the linear embossed portion from the cross-sectional area.
The fineness (denier) is determined from the specific gravity (substantially density) and the cross-sectional area of the fiber when the fibers of the topsheet are each made of one type of fiber and the resin used for the fiber is determined by DSC. The weight when the length of the fiber is 9000 m is denier. In a composite fiber such as a core-sheath structure, since the sheath component is a fusion component, the resin is similarly specified using DSC, and the average specific gravity is calculated from the cross-section during magnified observation. When a plurality of fibers are used, the average specific gravity is calculated from the blending ratio of the fibers by Method 2 in measuring the average diameter. (In the present invention, the specific gravity of the high density polyethylene is 0.94, polypropylene 0.96, polyester 1.36)

The napkin 1 may be a surface sheet made of an uneven nonwoven fabric as described in (2) to (4) below as a surface sheet made of an uneven nonwoven fabric having unevenness on the skin facing surface side.

(2) An uneven nonwoven fabric having a ridge groove structure having a plurality of ridge portions extending in the longitudinal direction X of the absorbent article and a groove portion existing between the ridge portions adjacent in the transverse direction Y of the absorbent article.
(3) An uneven nonwoven fabric having irregularities on the skin facing surface side and also having irregularities on the non-skin facing surface side. Preferably, the uneven nonwoven fabric in which the back side of the convex portion on the skin facing surface side is a concave portion on the non-skin facing surface side, and the back side of the concave portion on the skin facing surface side is a convex portion on the non-skin facing surface side.
(4) The first nonwoven fabric and the second nonwoven fabric are partially joined by fusion or the like to form a joined portion, and the first nonwoven fabric is separated from the second nonwoven fabric in the non-joined portion surrounded by the joined portion. An uneven nonwoven fabric projecting in the direction of leaving and forming a number of hollow convex portions.

Examples of the uneven nonwoven fabric of (2) include those having a solid heel portion as in the uneven nonwoven fabric described in JP-A-2009-215667, However, it is not limited to these. As in the case of the uneven nonwoven fabric described in JP-A-10-80445, JP-A-8-302555, etc., the cross-sectional shape perpendicular to the ridge extending in the longitudinal direction is the surface facing the skin and the surface facing the non-skin Any of these surfaces may have a continuous waveform shape.

[Method for measuring thickness of flange and groove]
The thickness and height difference of the ridge and the groove are measured by using a microscope VH-8000 (manufactured by Keyence Corporation) and magnifying and observing the cross section of the uneven nonwoven fabric 10 50 to 200 times. The cross section can be obtained by cutting the cross section of the uneven nonwoven fabric 10 using a feather razor (product number FAS-10, manufactured by Feather Safety Razor Co., Ltd.).

As the uneven nonwoven fabric of (3), an uneven nonwoven fabric in which the cross-sectional shape orthogonal to the ridge extending in the longitudinal direction has a continuous corrugated shape on both the skin facing surface side surface and the non-skin facing surface side surface. Can be mentioned. However, the uneven nonwoven fabric (3) is not limited to these.

Examples of the uneven nonwoven fabric (4) include three-dimensional sheets described in JP-A Nos. 2004-174234, 2015-142721, and 2015-112116. However, the uneven nonwoven fabric (4) is not limited to these.

As shown in FIG. 2, the absorbent body 4 in the napkin 1 has an absorbent core 41 containing pulp fibers and a core wrap sheet 42 that covers the absorbent core 41. The core wrap sheet 42 shown in FIG. 2 is wound down to the upper part 42a that covers the skin facing surface side of the absorbent core 41 and the non-skin facing surface side of the absorbent core 41, and And a lower portion 42b that covers the skin facing surface side. Moreover, the core wrap sheet | seat 42 has the overlap part 42c of a sheet | seat in the lower part 42b. The core wrap sheet covering the absorbent core 41 may wrap the entire absorbent core 41 with a single sheet, or may wrap the entire absorbent core 41 with two or more sheets. For example, the skin facing surface side and the non-skin facing surface side of the absorbent core 41 may be covered with separate sheets. Regardless of the number of sheets used for covering the absorbent core 41, the core wrap sheet covering the skin facing surface side of the absorbent core 41 is defined as the skin side core wrap sheet 42a and the non-absorbing core 41 non-covered. A portion covering the skin facing surface side is also referred to as a non-skin side core wrap sheet 42b.

In the napkin 1, as shown in FIG. 2, the entire region of the upper portion (skin-side core wrap sheet) 42a covering the skin facing surface side of the absorbent core 41 in the core wrap sheet 42 is agglomerated containing a hemagglutinating agent. The agent placement unit 9 is provided. The skin-side core wrap sheet 42 a is one of the lower members disposed in a position closer to the back sheet 3 than the top sheet 2 in the thickness direction of the napkin 1. The napkin 1 has a skin-side core wrap sheet 42a, an absorbent core 41, and a non-skin-side core wrap sheet 42b as lower members. It is preferable that the flocculant arrangement part 9 containing a hemagglutinating agent is formed at least on the skin-side core wrap sheet 42a which is a lower member adjacent to the top sheet 2 in the thickness direction of the absorbent article. The flocculant disposition part 9 containing the hemagglutinating agent may be formed only on the skin-side core wrap sheet 42a, but may be formed on the skin-side core wrap sheet 42a and the absorbent core 41, and further on the skin side. You may form so that the core wrap sheet | seat 42a, the absorptive core 41, and the non-skin side core wrap sheet | seat 42b may be covered. Further, the lower member containing the hemagglutinating agent may be a member other than the skin-side core wrap sheet, for example, an absorbent core or a non-skin-side core wrap sheet, and the hemagglutinating agent may be two or more lower members. You may make it contain. For example, the hemagglutinating agent can be disposed so as to cover any two or more of the skin-side core wrap sheet, the absorbent core, and the non-skin-side core wrap sheet. A hemagglutinating agent can also be arranged so as to cover the entire core and non-skin side core wrap sheet. Moreover, the flocculant arrangement | positioning part 9 containing a hemagglutinating agent is the non-skin opposing surface of the surface sheet 2 irrespective of the structure of the absorber 4, and whether there is a second sheet between the surface sheet 2 and the absorber 4. May extend over all the lower members from the member adjacent to the member adjacent to the skin facing surface of the back sheet 3.

The core wrap sheet is used for the purpose of improving the shape retention of the absorbent core, which is insufficient in shape retention by itself, or preventing the leakage of the constituent material of the absorbent core. The fiber sheet is used.
Examples of the cellulose fiber constituting the base sheet of the core wrap sheet 42 of the napkin 1 of the present embodiment include wood pulp fiber, rayon fiber, cotton fiber, and cellulose acetate fiber. Examples of cellulosic fiber pulp include wood pulp such as softwood kraft pulp or hardwood kraft pulp, and non-wood pulp such as cotton pulp or straw pulp. These cellulosic fibers can be used singly or in combination of two or more. Further, from the viewpoint of improving the strength, a small amount of non-cellulosic fibers can be mixed. Examples of non-cellulosic fibers include polyolefin fibers such as polyethylene and polypropylene, and condensation fibers such as polyester and polyamide. The proportion of the cellulosic fibers in the constituent fibers of the thin paper is preferably 70% by mass to 100% by mass, more preferably 90% by mass to 100% by mass, and still more preferably 100% by mass.
The nonwoven fabric used as the core wrap sheet can be a nonwoven fabric produced by various production methods without any particular limitation. For example, a spunbond nonwoven fabric, a melt blown nonwoven fabric, a span that is a nonwoven fabric obtained by entanglement of constituent fibers of a fiber web by high-speed water flow treatment. Examples include lace nonwoven fabrics, air-through nonwoven fabrics that are nonwoven fabrics obtained by thermally fusing constituent fibers of fiber webs by hot air treatment, resin-bonded nonwoven fabrics that are nonwoven fabrics obtained by bonding constituent fibers of fiber webs with an adhesive, and the like. It is done. The fiber web of spunlace nonwoven fabric, air-through nonwoven fabric, and resin bond nonwoven fabric can be manufactured by a card machine or an airlaid method in which fibers are stacked in air.

Non-woven fabric fibers are made from cellulose-based hydrophilic fibers such as wood pulp fibers, rayon fibers, cotton fibers and cellulose acetate, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, and synthetic resins such as polyamides such as nylon. The synthetic fiber which becomes is mentioned. As the synthetic fiber, a core-sheath type or side-by-side type composite fiber may be used. Among these, for the same reason as using thin paper, it is preferable that the raw fiber is a cellulosic fiber even when the nonwoven fabric manufacturing method is adopted. The proportion of the cellulosic fibers in the constituent fibers of the nonwoven fabric is preferably 70% by mass to 100% by mass, more preferably 90% by mass to 100% by mass, and still more preferably 100% by mass. The raw material fiber of a nonwoven fabric can be used individually by 1 type or in combination of 2 or more types.

The absorptive core 41 of the napkin 1 of this embodiment is composed of a mixed product of pulp fibers and a superabsorbent polymer. The mixed fiber stack is manufactured by a known drum-type fiber stacking apparatus including a stacking drum having a stacking concave portion on the peripheral surface, and is sucked from the bottom surface of the stacking concave portion, The surface is supplied with pulp fibers and superabsorbent polymer as the absorbent core forming material in a scattered state, and after the absorbent core forming material is deposited in the accumulation recess, it is released from the accumulation recess. Is obtained. The absorbent core 41 of the napkin 1 of the present embodiment may be a single fiber stack of pulp fibers that does not contain a superabsorbent polymer.

Examples of the pulp fibers constituting the absorbent core 41 include cellulose-based hydrophilic fibers such as wood pulp fibers, rayon fibers, cotton fibers, and cellulose acetate. These fibers can be used alone or in combination of two or more. Examples of the raw material pulp of the pulp fiber include wood pulp such as softwood kraft pulp or hardwood kraft pulp, and non-wood pulp such as cotton pulp or wall pulp. From the viewpoint of improving the strength, the absorbent core 41 is made of synthetic fibers such as polyolefin fibers such as polyethylene and polypropylene, condensed fibers such as polyester and polyamide, in addition to pulp fibers made of cellulosic hydrophilic fibers. A small amount may be mixed. The absorbent core in the present invention has a ratio of pulp fibers (cellulosic fibers), particularly wood pulp fibers, of preferably 70% by mass or more and 100% by mass or less, more preferably 90% by mass or more and 100% by mass or less. Preferably it is 100 mass%.

As the superabsorbent polymer, a particulate polymer is generally used, but a fibrous polymer may be used. When the particulate superabsorbent polymer is used, the shape thereof may be any of a spherical shape, a block shape, a bowl shape, and an amorphous shape. As the superabsorbent polymer, generally, a polymer or copolymer of acrylic acid or an alkali metal acrylate can be used. Examples thereof include polyacrylic acid and salts thereof and polymethacrylic acid and salts thereof. As the polyacrylate and polymethacrylate, sodium salts can be preferably used. In addition, acrylic acid or methacrylic acid, maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate, styrenesulfonic acid, etc. It is also possible to use a copolymer obtained by copolymerizing the above-mentioned comonomer within a range that does not deteriorate the performance of the superabsorbent polymer. When the absorbent core 41 contains the superabsorbent polymer, the absorbent core 41 can more quickly absorb and retain a large amount of excretory fluid such as blood. Moreover, you may mix | blend a deodorizer, an antibacterial agent, etc. with the absorptive core 41 as needed. There is no restriction | limiting in particular in the compounding quantity of the deodorizer and antibacterial agent in the absorptive core 41, What is necessary is just to be the quantity normally mix | blended in the said technical field.

The method for forming the agglutinating agent placement part by containing a hemagglutinating agent containing a cationic polymer in the constituent member of the napkin such as the core wrap sheet 42 is not particularly limited as long as the hemagglutinating agent can be retained in the constituent member. For example, a hemagglutinating agent is dissolved in an appropriate solvent such as water or ethanol to obtain a solution in which various physical properties such as viscosity are appropriately adjusted, and the solution is adhered to or immersed in the core wrap sheet 42, and then the core wrap sheet. It is preferable to dry 42 to remove the solvent from the viewpoint of being easily maintained in a state in which the hole portion of the core wrap sheet 42 is filled with the hemagglutinating agent. As a method of attaching the solution containing the hemagglutinating agent to the core wrap sheet 42, dropping of the solution onto a predetermined portion of the core wrap sheet 42 and various coating methods can be employed. For example, a liquid application to a predetermined portion of the core wrap sheet 42 using a known liquid coating apparatus such as a spray method, a dipping method, a transfer method, a die coating, a gravure coating, an ink jet method, a screen printing, etc. Can be mentioned. Among these, the spray coating method efficiently fills the pores by appropriately adjusting the shape of the nozzle for spraying, the coating amount thereof, etc., with a solution containing a hemagglutinating agent in which various physical properties such as viscosity are appropriately adjusted. It is preferable because it can be maintained in a state. The drying may be any of drying by heating, drying by reduced pressure, and drying combining heating and reduced pressure, but natural drying may be used instead of these forced drying. From the viewpoint of drying by heating and fixing the pores of the base material sheet to a filled state, heating is performed at a higher temperature within a range where the hemagglutinating agent and the base material sheet are not damaged, and drying is performed by rapidly removing the solvent. It is more preferable.

The sanitary napkin of the present embodiment is used by being fixed to a crotch portion or the like of shorts in the same manner as a normal sanitary napkin.
The napkin 1 is composed of an uneven nonwoven fabric 10 having at least unevenness on the skin-facing surface side, and a hemagglutinating agent is contained in a lower member such as the skin-side core wrap sheet 42a. Therefore, menstrual blood excreted on the top sheet 2 However, when it passes through the surface sheet 2 and reaches the lower member, the hemagglutinating agent comes into contact with the menstrual blood to produce an aggregate of red blood cells. When the surface sheet is made of a flat nonwoven fabric, when this agglomerate occurs in the surface sheet or in the vicinity of the surface sheet, when the surface sheet is pressed by body pressure applied during wearing, the agglomerate is Although it moves to the surface which touches the skin of a surface sheet and adheres to a wearer's skin, in the napkin 1, since the surface sheet 2 consists of the uneven | corrugated nonwoven fabric 10 which has an unevenness | corrugation in the skin opposing surface side, Even if pressure is applied to the surface sheet due to body pressure or the like, the convex portion is crushed preferentially, while menstrual blood passes through the side surface portion and the concave portion of the convex portion of the surface sheet 2 and from the non-skin facing surface of the surface sheet 2 In addition, by reacting with the hemagglutinating agent disposed at a position close to the back sheet, red blood cell aggregates are preferentially formed on the back sheet side over the recesses of the top sheet and the lower layer of the top sheet 2. On the skin of the wearer It is effectively prevented resulting discomfort such as stickiness in contact aggregates of blood cells are.

In particular, as in the present embodiment, when the topsheet 2 has a solid convex portion on the skin facing surface side, the fiber density becomes high at the time of high wearing pressure, and the convex portion is crushed. Since the shape is maintained, the absorption rate of excreted menstrual blood is increased, which is preferable. Furthermore, since the pores between fibers become small at high mounting pressure, the generated red blood cell agglomerates are easily caught on the fiber at the bottom of the solid, and the red blood cell agglomerates are difficult to move to the surface of the surface sheet. Is more effectively prevented from sticking to the wearer's skin and causing stickiness.

In addition, as in the present embodiment, when the topsheet 2 has a fiber density in the vicinity of the concave portion of the concave portion on the skin facing surface side higher than the fiber density of the top portion of the convex portion, the capillary force of the concave portion is higher than that of the convex portion. Becomes larger. Therefore, the aggregate of red blood cells is difficult to move to the surface of the surface sheet, and it is more effectively prevented that the aggregate of red blood cells adheres to the wearer's skin and causes stickiness. The fiber density in the vicinity of the concave portion and the fiber density at the top portion of the convex portion are measured as follows.
<Measurement method of fiber density>
The cut surface of the surface sheet 2 is magnified and observed using a scanning electron microscope (adjusted to a magnification capable of measuring about 30 to 60 fiber cross sections; 150 to 500 times), and the above per unit area (about 0.5 mm ² ). Count the number of cross-sections of the fibers being cut by the cut surface. Next, it is converted into the number of cross sections of the fiber per 1 mm ² and this is defined as the fiber density. The measurement is performed at three locations, and the average is the fiber density of the sample. As the scanning electron microscope, for example, JCM-5100 (trade name) manufactured by JEOL Ltd. can be used.

Moreover, like this embodiment, the surface sheet 2 has the upper layer distribute | arranged to the skin opposing surface side, and the lower layer distribute | arranged to the non-skin opposing surface side rather than this upper layer, The fiber density of the said lower layer is the said When the fiber density is higher than that of the upper layer, the capillary force of the lower layer becomes larger than that of the upper layer. Therefore, the absorption rate of excreted menstrual blood is increased, and the aggregate of red blood cells generated by the lower member is less likely to move to the surface of the top sheet, so that the aggregate of red blood cells adheres to the wearer's skin. It is possible to more effectively prevent stickiness.

Further, as in the sanitary napkin of the present embodiment, when the topsheet 2 is composed of the uneven nonwoven fabric 10 in which the convex portions are arranged in the form of scattered dots in plan view, the pressure applied to the topsheet 2 is in the planar direction. Difficult to propagate to. Furthermore, in a large area in the plane direction, menstrual blood is drawn to the lower layer side, so that the absorption speed is increased, and the aggregate of red blood cells generated on the lower layer side is prevented from returning to the surface of the topsheet 2. Menstrual blood passes through the side surface and the concave portion of the convex portion of the topsheet 2 and reacts with a hemagglutinating agent disposed closer to the backsheet 3 than the non-skin facing surface of the topsheet 2, thereby aggregating red blood cells. Since the lump is formed preferentially on the back sheet side over the non-skin facing surface of the recess and the top sheet 2, the agglomerate of red blood cells may come into contact with the wearer's skin and cause discomfort such as stickiness. Effectively prevented.

As shown in FIG. 1, the napkin 1 shown in FIGS. 1 and 2 has side leakage preventing grooves 81, 81 extending in the vertical direction X on both sides of the vertical center line CL on the skin facing surface of the napkin 1. ing.
Each of the pair of side leakage preventing grooves 81 extends in the longitudinal direction X of the napkin 1 on each side of the excretion spot portion P in the lateral direction Y. The pair of side leakage preventing grooves 81 and 81 preferably extend in the longitudinal direction X at least on both sides of the excretion part facing part B with the excretion spot part P interposed therebetween. The side leakage prevention groove 81 preferably extends from the excretory part facing part B to the front part A or the rear part B. As shown in FIG. 1, the front part A, the excretion part facing part B, and More preferably, it extends over the rear part C.
Moreover, it is preferable that the end part by the side of the front part A is connected by the front leak-proof groove 82 which passes a front side from the excretion spot part P, and a pair of side leak- proof groove 81,81 is excreted. It is preferable that end portions on the rear portion C side are connected to each other by a rear leakage prevention groove 83 that passes rearward from the spot portion P.

Each of the pair of side leakage preventing grooves 81 is a central circle having a plan view shape that is curved outwardly in the lateral direction Y at portions located on both sides of the lateral direction Y across the excretion spot portion. A front arcuate part 81a and a rear circle each having an arcuate part 81b and having a plan view shape curved in a convex manner outward in the lateral direction Y before and after the central arcuate part 81b in the longitudinal direction X It has an arcuate portion 81c. Each of the pair of side leakage preventing grooves 81 has a plan view shape in which the three arcuate portions 81a, 81b, 81c that are convexly curved outward in the lateral direction Y are connected in the longitudinal direction X. The connecting portion between the central arc-shaped portion 81b and the front arc-shaped portion 81a and the connecting portion between the central arc-shaped portion 81b and the rear arc-shaped portion 81c have a distance between the pair of side leakage preventing grooves 81. It is a narrowed part.

In any of the side leak-proof groove 81, the front leak-proof groove 82, and the rear leak-proof groove 83, the skin facing surface side of the absorbent body 4 is recessed in a groove shape together with the top sheet 2, and the absorbent body 4 is The portions where the leakage grooves 81, 82, 83 are formed are consolidated as compared with the portions of the absorber 4 that are located on both sides of the leakage prevention grooves 81, 82, 83. The annular leak-proof groove 8 is formed by, for example, subjecting the top sheet 2 and the absorbent body 4 to overlap each other toward the back sheet 3 by integrally pressing or embossing with heating and pressurization. Can be formed. The main role of the leak-proof groove 8 is to suppress the diffusion of liquid in the plane direction of the napkin 1.

Moreover, it is preferable that the uneven nonwoven fabric used as the surface sheet 2 is hydrophilic in whole or in part in the thickness direction or the planar direction. In particular, it is preferable that the portions where the leakage preventing grooves 81, 82, 83 are formed are hydrophilic. When the surface sheet 2 at the site where the leak- proof grooves 81, 82, 83 are formed is hydrophilic, hydrophilic menstrual blood can efficiently diffuse in the absorbent body.

As a method of making the whole or a part of the topsheet 2 hydrophilic, a nonwoven fabric or polyethylene, which is mainly composed of cellulose fibers such as wood pulp fibers, rayon fibers, cotton fibers, cellulose acetate fibers, etc., as the topsheet 2 And a method using a non-woven fabric or the like mainly composed of fibers obtained by hydrophilizing synthetic fibers such as polyolefin fibers such as polypropylene and condensed fibers such as polyester and polyamide with a hydrophilic oil.

As the hemagglutinating agent used in the hemagglutinating fiber of the present invention, those having an action capable of aggregating erythrocytes in blood are used. Red blood cells aggregated by the hemagglutinating agent become aggregates. A cationic polymer is useful as the hemagglutinating agent. The reason is as follows. Red blood cells have a red blood cell membrane on their surface. The erythrocyte membrane has a two-layer structure. This two-layer structure is composed of a red blood cell membrane skeleton as a lower layer and a lipid membrane as an upper layer. The lipid film exposed on the surface of erythrocytes contains a protein called glycophorin. Glycophorin has a sugar chain to which a sugar having an anionic charge called sialic acid is bonded at its end. As a result, erythrocytes can be treated as colloidal particles having an anionic charge. In general, an aggregating agent is used for aggregating the colloidal particles. Considering that erythrocytes are anionic colloidal particles, it is advantageous to use a cationic substance as an aggregating agent from the viewpoint of neutralizing the electric double layer of erythrocytes. Further, if the aggregating agent has a polymer chain, the polymer chains of the aggregating agent adsorbed on the surface of the erythrocyte tend to be entangled with each other, thereby promoting the aggregation of erythrocytes. Further, when the aggregating agent has a functional group, it is preferable because the aggregation of erythrocytes is promoted by the interaction between the functional groups. According to the hemagglutinating agent (cationic polymer), it becomes possible to produce an aggregate of red blood cells during menstrual blood by the above mechanism of action.

The preferred hemagglutinating agent used in the present invention is preferably one that acts to agglutinate erythrocytes in blood to form erythrocyte clots and to separate plasma components. A particularly preferred hemagglutinating agent has the property that, when 1000 ppm of a measurement sample agent is added to simulated blood, at least two or more red blood cells aggregate to form an aggregate while maintaining the fluidity of blood. Is.

The above-mentioned “state in which the fluidity of blood is maintained” means that 10 g of simulated blood to which a measurement sample is added at 1000 ppm is screw tube bottle (manufactured by Maruemu, product number “screw tube No. 4”, mouth inner diameter 14.5 mm, body diameter 27 mm, full length 55 mm), and when the screw tube bottle containing the simulated blood is inverted 180 degrees, 80% or more of the simulated blood flows down within 5 seconds. Simulated blood means that the viscosity measured using a B-type viscometer (model number TVB-10M manufactured by Toki Sangyo Co., Ltd., measurement conditions: rotor No. 19, 30 rpm, 25 ° C., 60 seconds) is 8 mPa · s. The blood cell / plasma ratio of defibrinated horse blood (manufactured by Nippon Biotest Laboratories, Inc.) was prepared.

Whether or not “two or more erythrocytes have aggregated to form an aggregate” is determined as follows. That is, the simulated blood to which a measurement sample was added at 1000 ppm was diluted 4000 times with physiological saline, and a laser diffraction / scattering type particle size distribution measuring device (manufactured by HORIBA, model number: LA-950V2, measurement condition: flow cell measurement). The average median diameter of the volume particle diameter measured at a temperature of 25 ° C. by a laser diffraction scattering method using a circulation speed of 1 and no ultrasonic wave is 10 μm corresponding to the size of an aggregate in which two or more red blood cells are aggregated. When it is above, it is determined that “two or more red blood cells aggregate to form an aggregate”.

The hemagglutinating agent used in the present invention satisfies the above-mentioned properties by a single compound that meets the above-described properties, a plurality of combinations of single compounds that meet the above-mentioned properties, or a combination of a plurality of compounds (aggregation of erythrocytes). Agent). In other words, the hemagglutinating agent is an agent limited to those having an erythrocyte aggregating action as defined above. Therefore, when the hemagglutinating agent contains a third component that does not meet the above definition, it is expressed as a hemagglutinating agent composition and is distinguished from the hemagglutinating agent. Here, the term “single compound” is a concept including compounds having the same composition formula but having different molecular weights due to different numbers of repeating units.

As the hemagglutinating agent used in the present invention, a cationic polymer is preferable. Examples of the cationic polymer include cationized cellulose and cationized starch such as hydroxypropyltrimonium chloride. The hemagglutinating agent used in the present invention can also contain a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer or a quaternary ammonium salt polycondensate as a cationic polymer. In the present invention, the “quaternary ammonium salt” includes a compound having a plus monovalent charge at the nitrogen atom position, or a compound that generates a plus monovalent charge at the nitrogen atom position by neutralization. Specific examples thereof include a salt of a quaternary ammonium cation, a neutralized salt of a tertiary amine, and a tertiary amine having a cation in an aqueous solution. The “quaternary ammonium moiety” described below is also used in the same meaning and is a moiety that is positively charged in water. Further, in the present invention, the “copolymer” is a polymer obtained by copolymerization of two or more kinds of polymerizable monomers, and is a binary copolymer or a ternary copolymer or more. Includes both things. In the present invention, the “polycondensate” is a polycondensate obtained by polymerizing a condensate composed of two or more monomers. Thus, in the present specification, the “hemagglutinating agent” refers to the aggregation of erythrocytes by a single compound or a combination of single compounds capable of aggregating blood erythrocytes or a combination of a plurality of compounds. It is an agent that expresses. That is, the hemagglutinating agent is an agent limited to those having a hemagglutination effect. Therefore, when the hemagglutinating agent contains the third component, it is expressed as a hemagglutinating agent composition and is distinguished from the hemagglutinating agent. Here, the term “single compound” is a concept including compounds having the same composition formula but having different molecular weights due to different numbers of repeating units.

When the hemagglutinating agent used in the present invention contains a quaternary ammonium salt homopolymer and / or a quaternary ammonium salt copolymer and / or a quaternary ammonium salt polycondensate as the cationic polymer, the hemagglutination The agent may contain any one of a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer and a quaternary ammonium salt polycondensate, or any combination of two or more. May be included. Moreover, a quaternary ammonium salt homopolymer can be used individually by 1 type or in combination of 2 or more types. Similarly, the quaternary ammonium salt copolymer can be used alone or in combination of two or more. Furthermore, similarly, a quaternary ammonium salt polycondensate can be used individually by 1 type or in combination of 2 or more types.

Of the various cationic polymers described above, in particular, the use of a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer or a quaternary ammonium salt polycondensate from the viewpoint of adsorptivity to erythrocytes. preferable. In the following description, for convenience, the quaternary ammonium salt homopolymer, the quaternary ammonium salt copolymer and the quaternary ammonium salt polycondensate are collectively referred to as “quaternary ammonium salt polymer”.

The quaternary ammonium salt homopolymer is obtained by polymerizing one type of polymerizable monomer having a quaternary ammonium moiety. On the other hand, the quaternary ammonium salt copolymer uses at least one polymerizable monomer having a quaternary ammonium moiety and, if necessary, at least one polymerizable monomer having no quaternary ammonium moiety. It was obtained by using seeds and copolymerizing them. That is, the quaternary ammonium salt copolymer is obtained by using two or more polymerizable monomers having a quaternary ammonium moiety and copolymerizing them, or having a quaternary ammonium moiety. It is obtained by copolymerizing one or more polymerizable monomers having one or more polymerizable monomers having no quaternary ammonium moiety. The quaternary ammonium salt copolymer may be a random copolymer, an alternating copolymer, a block copolymer, or a graft copolymer. The quaternary ammonium salt polycondensate is obtained by polymerizing these condensates using a condensate composed of one or more monomers having a quaternary ammonium moiety. That is, the quaternary ammonium salt polycondensate is obtained by polymerizing two or more condensates having two or more monomers having a quaternary ammonium moiety, or the quaternary ammonium moiety. And a condensate comprising one or more monomers having quaternary ammonium moieties and one or more monomers having no quaternary ammonium moiety, and obtained by condensation polymerization.

The quaternary ammonium salt polymer is a cationic polymer having a quaternary ammonium moiety. A quaternary ammonium moiety can be generated by quaternary ammoniumation of a tertiary amine using an alkylating agent. Alternatively, the tertiary amine can be dissolved in acid or water and generated by neutralization. Or it can produce | generate by the quaternary ammonium formation by the nucleophilic reaction containing a condensation reaction. Examples of the alkylating agent include alkyl halides and dialkyl sulfates such as dimethyl sulfate and dimethyl sulfate. Of these alkylating agents, the use of dialkyl sulfate is preferable because the problem of corrosion that may occur when an alkyl halide is used does not occur. Examples of the acid include hydrochloric acid, sulfuric acid, nitric acid, acetic acid, citric acid, phosphoric acid, fluorosulfonic acid, boric acid, chromic acid, lactic acid, oxalic acid, tartaric acid, gluconic acid, formic acid, ascorbic acid, and hyaluronic acid. . In particular, it is preferable to use a quaternary ammonium salt polymer in which a tertiary amine moiety is quaternized with an alkylating agent, because the electric double layer of erythrocytes can be reliably neutralized. Quaternary ammoniumation by a nucleophilic reaction including a condensation reaction can be caused by a ring-opening polycondensation reaction of dimethylamine and epichlorohydrin or a cyclization reaction of dicyandiamide and diethylenetriamine.

From the viewpoint of effectively generating red blood cell aggregates, the cationic polymer preferably has a molecular weight of 2000 or more, more preferably 10,000 or more, and even more preferably 30,000 or more. When the molecular weight of the cationic polymer is not less than these values, the entanglement of the cationic polymers between the erythrocytes and the crosslinking of the cationic polymer between the erythrocytes are sufficiently caused. The upper limit of the molecular weight is preferably 10 million or less, more preferably 5 million or less, and even more preferably 3 million or less. When the molecular weight of the cationic polymer is not more than these values, the cationic polymer dissolves well into menstrual blood. Also, if the molecular weight of the cationic polymer is below these values, menstrual clumps are likely to have an appropriate size, and the voids in the pulp fiber voids and core wrap sheet voids contained in the absorbent core Since the clogging of the agglomerates can be suppressed, it is also preferable from the viewpoint of maintaining high menstrual permeability in the absorbent core and the core wrap sheet even after the cationic polymer is well dissolved in menstrual blood. The molecular weight of the cationic polymer is preferably 2000 or more and 10 million or less, more preferably 2000 or more and 5 million or less, still more preferably 2000 or more and 3 million or less, and 10,000 or more and 3 million or less. It is even more preferable, and it is particularly preferably 30,000 to 3,000,000. The molecular weight referred to in the present invention is a weight average molecular weight. The molecular weight of the cationic polymer can be controlled by appropriately selecting the polymerization conditions. The molecular weight of the cationic polymer can be measured using HLC-8320GPC manufactured by Tosoh Corporation. Specific measurement conditions are as follows.

As the column, a column in which a guard column α manufactured by Tosoh Corporation and an analytical column α-M are connected in series is used at a column temperature of 40 ° C. The detector uses RI (refractive index). As a measurement sample, 1 mg of the treatment agent (quaternary ammonium salt polymer) to be measured is dissolved in 1 mL of the eluent. A copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate uses an eluent in which 150 mmol / L sodium sulfate and 1% by mass acetic acid are dissolved in water. A copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate has a molecular weight of 5900, a pullulan with a molecular weight of 47300, a pullulan with a molecular weight of 212,000, and a molecular weight of 788,000 with respect to 10 mL of the eluent. Pullulan, a pullulan mixture with 2.5 mg each dissolved, is used as the molecular weight standard. A copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate is measured at a flow rate of 1.0 mL / min and an injection amount of 100 μL. Except for a copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate, elution with 50 mmol / L lithium bromide and 1% by mass acetic acid dissolved in ethanol: water = 3: 7 (volume ratio) Use liquid. Except for a copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate, a polyethylene glycol (PEG) having a molecular weight of 106, a PEG having a molecular weight of 400, a PEG having a molecular weight of 1470, and a PEG having a molecular weight of 6450 with respect to 20 mL of the eluent. Polyethylene oxide (PEO) having a molecular weight of 50,000, PEO having a molecular weight of 235,000, PEO having a molecular weight of 875,000, and a PEG-PEO mixture in which 10 mg of each is dissolved is used as a molecular weight standard. Except for a copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate, the flow rate is 0.6 mL / min and the injection amount is 100 μL.

From the viewpoint of effectively producing red blood cell aggregates, the cationic polymer is preferably water-soluble. In the present invention, “water-soluble” means that 0.05 g of a 1 mm or less powdery or 0.5 mm or less film-like cationic polymer is added to a 100 mL glass beaker (5 mmΦ) and mixed with 50 mL ion-exchanged water at 25 ° C. In this case, a stirrer chip having a length of 20 mm and a width of 7 mm is inserted, and the whole amount is dissolved in water within 24 hours under stirring at 600 rpm using a magnetic stirrer HPS-100 manufactured by ASONE Co., Ltd. In the present invention, as the more preferable solubility, the total amount is preferably dissolved in water within 3 hours, and the total amount is more preferably dissolved in water within 30 minutes.

The cationic polymer preferably has a structure having a main chain and a plurality of side chains bonded thereto. In particular, the quaternary ammonium salt polymer preferably has a structure having a main chain and a plurality of side chains bonded thereto. The quaternary ammonium moiety is preferably present in the side chain. In this case, when the main chain and the side chain are bonded at one point, the flexibility of the side chain is difficult to be hindered, and the quaternary ammonium moiety present in the side chain is smoothly formed on the surface of the erythrocyte. Adsorbs. However, in the present invention, it is not hindered that the main chain and the side chain of the cationic polymer are bonded at two points or more. In the present invention, “bonded at one point” means that one of the carbon atoms constituting the main chain is single-bonded with one carbon atom located at the end of the side chain. . “Connected at two or more points” means that two or more of the carbon atoms constituting the main chain are each single-bonded with two or more carbon atoms located at the end of the side chain. Say.

When the cationic polymer has a structure having a main chain and a plurality of side chains bonded thereto, for example, a quaternary ammonium salt polymer has a structure having a main chain and a plurality of side chains bonded thereto. In this case, the number of carbon atoms in each side chain is preferably 4 or more, more preferably 5 or more, and even more preferably 6 or more. The upper limit of the carbon number is preferably 10 or less, more preferably 9 or less, and even more preferably 8 or less. For example, the number of carbon atoms in the side chain is preferably 4 or more and 10 or less, more preferably 5 or more and 9 or less, and still more preferably 6 or more and 8 or less. The carbon number of the side chain is the carbon number of the quaternary ammonium moiety (cation moiety) in the side chain, and even if carbon is contained in the anion that is the counter ion, the carbon is counted. Not included. In particular, among the carbon atoms in the side chain, the number of carbon atoms from the carbon atom bonded to the main chain to the carbon atom bonded to the quaternary nitrogen is within the aforementioned range, so that the quaternary ammonium salt. This is preferable because the steric hindrance when the polymer is adsorbed on the surface of the erythrocyte is reduced.

When the quaternary ammonium salt polymer is a quaternary ammonium salt homopolymer, examples of the homopolymer include a polymer of a vinyl monomer having a quaternary ammonium moiety or a tertiary amine moiety. . In the case of polymerizing a vinyl monomer having a tertiary amine moiety, a quaternary ammonium salt homopolymer in which the tertiary amine moiety is quaternized with an alkylating agent before and / or after polymerization. Becomes a polymer, becomes a tertiary amine neutralized salt obtained by neutralizing a tertiary amine site with an acid before and / or after polymerization, or becomes a tertiary amine having a cation in an aqueous solution after polymerization. . Examples of the alkylating agent and the acid are as described above.

In particular, the quaternary ammonium salt homopolymer preferably has a repeating unit represented by the following formula 1.

Specific examples of the quaternary ammonium salt homopolymer include polyethyleneimine. In addition, poly (2-methacryloxyethyldimethylamine quaternary salt), poly (2-methacryloxyethyltrimethylammonium salt) in which the side chain having a quaternary ammonium moiety is bonded to the main chain at one point. ), Poly (2-methacryloxyethyldimethylethylammonium methylsulfate), poly (2-acryloxyethyldimethylamine quaternary salt), poly (2-acryloxyethyltrimethylamine quaternary salt), poly (2-acryloxy) Ethyldimethylethylammonium ethyl sulfate), poly (3-dimethylaminopropylacrylamide quaternary salt), dimethylaminoethyl polymethacrylate, polyallylamine hydrochloride, cationized cellulose, polyethyleneimine, polydimethylaminopropylacrylamide, polyamidine, etc. And the like. On the other hand, examples of the homopolymer in which the side chain having a quaternary ammonium moiety is bonded to the main chain at two or more points include polydiallyldimethylammonium chloride and polydiallylamine hydrochloride.

When the quaternary ammonium salt polymer is a quaternary ammonium salt copolymer, two kinds of polymerizable monomers used for the polymerization of the quaternary ammonium salt homopolymer described above are used as the copolymer. A copolymer obtained by the above copolymerization can be used. Alternatively, as a quaternary ammonium salt copolymer, one or more polymerizable monomers used for the polymerization of the quaternary ammonium salt homopolymer described above and a polymerizable monomer having no quaternary ammonium moiety The copolymer obtained by copolymerizing using 1 or more types of bodies can be used. Furthermore, other polymerizable monomers such as —SO ₂ — may be used in addition to or instead of the vinyl polymerizable monomer. As described above, the quaternary ammonium salt copolymer can be a binary copolymer or a ternary or higher copolymer.

In particular, the quaternary ammonium salt copolymer has a repeating unit represented by the above-described formula 1 and a repeating unit represented by the following formula 2 to effectively produce an agglomerate of erythrocytes. It is preferable from the viewpoint.

Also, as the polymerizable monomer having no quaternary ammonium moiety, a cationic polymerizable monomer, an anionic polymerizable monomer, or a nonionic polymerizable monomer can be used. Among these polymerizable monomers, in particular, by using a cationic polymerizable monomer or a nonionic polymerizable monomer, charge cancellation with a quaternary ammonium moiety in a quaternary ammonium salt copolymer is achieved. Therefore, erythrocyte aggregation can be effectively generated. Examples of cationic polymerizable monomers include linear compounds having a cation-carrying nitrogen atom in the main chain, such as vinylpyridine as a cyclic compound having a cation-carrying nitrogen atom under a particular condition And a condensed compound of dicyandiamide and diethylenetriamine. Examples of the anionic polymerizable monomer include 2-acrylamido-2-methylpropane sulfonic acid, methacrylic acid, acrylic acid, styrene sulfonic acid, and salts of these compounds. On the other hand, examples of nonionic polymerizable monomers include vinyl alcohol, acrylamide, dimethylacrylamide, ethylene glycol monomethacrylate, ethylene glycol monoacrylate, hydroxyethyl methacrylate, hydroxyethyl acrylate, methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl Examples include acrylate, propyl methacrylate, propyl acrylate, butyl methacrylate, and butyl acrylate. One of these cationic polymerizable monomers, anionic polymerizable monomers, or nonionic polymerizable monomers can be used, or any two or more of them can be used in combination. Can do. Also, two or more cationic polymerizable monomers can be used in combination, two or more anionic polymerizable monomers can be used in combination, or two or more nonionic polymerizable monomers can be used in combination. Can also be used. A quaternary ammonium salt copolymer copolymerized using a cationic polymerizable monomer, an anionic polymerizable monomer and / or a nonionic polymerizable monomer as a polymerizable monomer has a molecular weight of However, as described above, it is preferably 10 million or less, particularly 5 million or less, and particularly preferably 3 million or less (the same applies to the quaternary ammonium salt copolymer exemplified below).

A polymerizable monomer having a functional group capable of hydrogen bonding can also be used as the polymerizable monomer having no quaternary ammonium moiety. When such a polymerizable monomer is used for copolymerization, and when erythrocytes are aggregated using a quaternary ammonium salt copolymer obtained therefrom, a hard aggregate is likely to be formed. Absorption performance is less likely to be disturbed. Examples of the functional group capable of hydrogen bonding include —OH, —NH ₂ , —CHO, —COOH, —HF, —SH and the like. Examples of polymerizable monomers having functional groups capable of hydrogen bonding include hydroxyethyl methacrylate, vinyl alcohol, acrylamide, dimethylacrylamide, ethylene glycol monomethacrylate, ethylene glycol monoacrylate, hydroxyethyl methacrylate, hydroxyethyl An acrylate etc. are mentioned. In particular, hydroxyethyl methacrylate, 2-hydroxyethyl methacrylate, hydroxyethyl acrylate, dimethylacrylamide, and the like, in which hydrogen bonds work strongly, are preferable because the adsorption state of quaternary ammonium salt polymers on erythrocytes is stabilized. These polymerizable monomers can be used individually by 1 type or in combination of 2 or more types.

As the polymerizable monomer having no quaternary ammonium moiety, a polymerizable monomer having a functional group capable of hydrophobic interaction can also be used. By using such a polymerizable monomer for copolymerization, the same advantageous effect as that in the case of using the polymerizable monomer having a functional group capable of hydrogen bonding described above, that is, the hardness of erythrocytes The effect that it becomes easy to produce an agglomerate is produced. Examples of functional groups capable of hydrophobic interaction include alkyl groups such as methyl, ethyl, and butyl groups, phenyl groups, alkylnaphthalene groups, and fluorinated alkyl groups. Examples of polymerizable monomers having functional groups capable of hydrophobic interaction include methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl acrylate, propyl methacrylate, propyl acrylate, butyl methacrylate, butyl acrylate, styrene, etc. Is mentioned. In particular, methyl methacrylate, methyl acrylate, butyl methacrylate, butyl acrylate, etc., which have a strong hydrophobic interaction and do not significantly reduce the solubility of the quaternary ammonium salt polymer, are adsorbed to erythrocytes by the quaternary ammonium salt polymer. Is preferable because of stabilization. These polymerizable monomers can be used individually by 1 type or in combination of 2 or more types.

The molar ratio of the polymerizable monomer having a quaternary ammonium moiety and the polymerizable monomer having no quaternary ammonium moiety in the quaternary ammonium salt copolymer is the quaternary ammonium salt. It is preferable that the red blood cells are appropriately adjusted so as to be sufficiently aggregated by the ammonium salt copolymer. In particular, the molar ratio of the polymerizable monomer having a quaternary ammonium moiety in the quaternary ammonium salt copolymer is preferably 10 mol% or more, more preferably 22 mol% or more, and 32 mol. % Or more, more preferably 38 mol% or more. Further, it is preferably 100 mol% or less, more preferably 80 mol% or less, still more preferably 65 mol% or less, and even more preferably 56 mol% or less. Specifically, the molar ratio of the polymerizable monomer having a quaternary ammonium moiety is preferably 10 mol% or more and 100 mol% or less, more preferably 22 mol% or more and 80 mol% or less, More preferably, it is 32 mol% or more and 65 mol% or less, and more preferably 38 mol% or more and 56 mol% or less.

When the quaternary ammonium salt polymer is a quaternary ammonium salt polycondensate, as the polycondensate, a condensate composed of one or more monomers having the quaternary ammonium moiety described above is used. Polycondensates obtained by polymerizing these condensates can be used. Specific examples include dicyandiamide / diethylenetriamine polycondensate, dimethylamine / epichlorohydrin polycondensate, and the like.

The quaternary ammonium salt homopolymer and quaternary ammonium salt copolymer described above can be obtained by a homopolymerization method or a copolymerization method of a vinyl polymerizable monomer. As the polymerization method, for example, radical polymerization, living radical polymerization, living cation polymerization, living anion polymerization, coordination polymerization, ring-opening polymerization, polycondensation and the like can be used. There are no particular limitations on the polymerization conditions, and the conditions under which a quaternary ammonium salt polymer having the desired molecular weight, streaming potential, and / or IOB value can be obtained may be appropriately selected.

The cationic polymer described in detail above is an example of the above-mentioned “particularly preferred hemagglutinating agent”, and the effect thereof is Japanese Patent Application No. 2015-239286 and Japanese Patent Application Laid-Open No. 2016-107100, which is the Japanese publication of the application. Reference can be made to Examples 1 to 45 described in the gazette and International Application No. 2016/093233 pamphlet of international application based on the priority claim.

In addition to the polycation (cationic polymer), the hemagglutinating agent used in the present invention includes one third component such as a solvent, a plasticizer, a fragrance, an antibacterial / deodorant, and a skin care agent. It may be in the form of a composition (hemagglutinating agent composition) contained above. As the solvent, water, a water-soluble organic solvent such as a saturated aliphatic monohydric alcohol having 1 to 4 carbon atoms, or a mixed solvent of the water-soluble organic solvent and water can be used. As the plasticizer, glycerin, polyethylene glycol, propylene glycol, ethylene glycol, 1,3-butanediol and the like can be used. As a fragrance | flavor, the fragrance | flavor which has the green herbal-like fragrance described in patent 4776407, the extract of a plant, the extract of citrus fruits, etc. can be used. As an antibacterial / deodorant, it is polymerized from a cancrinite-like mineral containing a metal having antibacterial properties described in Japanese Patent No. 4526271, and a polymerizable monomer having a phenyl group described in Japanese Patent No. 4587928. Porous polymers, quaternary ammonium salts, activated carbon, clay minerals and the like described in Japanese Patent No. 4651392 can be used. As the skin care agent, plant extracts, collagen, natural moisturizing ingredients, moisturizing agents, keratin softening agents, anti-inflammatory agents and the like described in Japanese Patent No. 4084278 can be used.

The proportion of the cationic polymer in the hemagglutinating agent composition is preferably 1% by mass or more, more preferably 3% by mass or more, and further preferably 5% by mass or more. Further, it is preferably 50% by mass or less, more preferably 30% by mass or less, and still more preferably 10% by mass or less. By setting the proportion of the cationic polymer in the hemagglutinating agent composition within this range, an effective amount of the cationic polymer can be imparted to the absorbent article.

As mentioned above, although this invention was demonstrated, this invention is not restrict | limited to embodiment mentioned above, In the range which does not deviate from the meaning of this invention, it can change suitably. For example, instead of disposing a hemagglutinating agent over the entire area of the lower member such as the skin-side core wrap sheet that overlaps the absorbent core, one of the portions of the lower member such as the skin-side core wrap sheet that overlaps the absorbent core. It is also preferable to partially dispose the hemagglutinating agent in an arbitrary pattern in the part.

Further, the lower member containing the hemagglutinating agent may be a member other than the skin-side core wrap sheet, for example, an absorbent core or a non-skin-side core wrap sheet, and the hemagglutinating agent may be divided into two or more lower members. It may be included. For example, it may be any two or more of the skin-side core wrap sheet, the absorbent core, and the non-skin-side core wrap sheet, and all of the skin-side core wrap sheet, the absorbent core, and the non-skin-side core wrap sheet It is also possible to arrange a hemagglutinating agent over the range.

Further, the absorbent core 41 is not limited to the one having a uniform thickness over the entire area in the plane direction. For example, a part of the plane direction, for example, a central part of the excretory part facing part B, etc. A raised portion that protrudes toward the skin side can also be formed. Such a raised portion can be formed, for example, on a part of the absorbent core 41 by partially increasing the basis weight of a constituent material such as pulp fiber.

In addition to the annular leak-proof groove 8, the absorbent article of the present invention has the topsheet 2 indented into the absorbent body 4 by compression processing such as embossing on the skin facing surface formed from the topsheet. It is preferable to have a recess having an arbitrary shape. It is preferable to provide a plurality of such recesses spaced apart from each other. Having such a recess improves the drawability of menstrual blood into the absorber. The planar view shape of the recess can be any shape such as a small circle, a star, a square, a hexagon, and the like.
The absorbent article may not have a side leak-proof sheet and a leak-proof mechanism thereby, may not have a wing portion, and does not have a leak-proof groove. Also good. Further, the absorbent article of the present invention may be a panty liner (clay sheet) other than a sanitary napkin.

In relation to the embodiment of the present invention described above, the present invention further discloses the following absorbent article.
<1>
A liquid-permeable surface sheet that forms a skin-facing surface, a back sheet that forms a non-skin-facing surface, and an absorber disposed between both sheets, and a longitudinal direction and a longitudinal direction along the front-rear direction of the wearer An absorbent article for menstrual blood absorption having a transverse direction orthogonal to the surface sheet, wherein the top sheet is made of a concavo-convex nonwoven having at least unevenness on the skin facing surface side, and the back surface is more than the non-skin facing surface of the top sheet. An absorptive article, wherein a hemagglutinating agent is contained in a lower member disposed at a position close to the sheet.
<2>
The said uneven nonwoven fabric is an absorbent article as described in said <1> whose fiber density near the recessed part of the said unevenness | corrugation at the skin opposing surface side is higher than the fiber density of the top part of a convex part.
<3>
The said uneven nonwoven fabric is an absorbent article as described in said <1> or <2> in which the convex part of the said unevenness | corrugation is arrange | positioned in the shape of a dot in planar view.
<4>
The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and the fiber density of the lower layer is higher than the fiber density of the upper layer, < The absorbent article according to any one of 1> to <3>.
<5>
The absorbent article according to any one of the above items <1> to <4>, wherein the concave-convex convex portion on the skin facing surface side of the concave-convex nonwoven fabric is solid inside.

<6>
The absorbent article according to any one of <1> to <5>, wherein the uneven nonwoven fabric has a distance between the tops of the uneven protrusions of 0.5 to 10.0 mm in plan view.
<7>
The absorbent article according to any one of <1> to <6>, wherein the uneven nonwoven fabric has a width of the recesses of the unevenness of 0.2 mm to 3.0 mm in plan view.
<8>
The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and the upper layer is formed using heat-extensible fibers, and the heat stretching <1, wherein the lower layer has no fiber that is bonded to heat or has a lower proportion than the upper layer. The absorbent article according to any one of> to <7>.
<9>
The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and an interface between the upper layer and the lower layer is bonded to each other. The absorbent article according to any one of <1> to <8>, wherein the absorbent article has a non-adhered portion in which the upper layer and the lower layer are detachably laminated.
<10>
The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and an average diameter of fibers constituting the upper layer and fibers constituting the lower layer The absorptivity according to any one of <1> to <9>, wherein the average diameter is substantially the same, or the average diameter of the fibers constituting the lower layer is larger than the average diameter of the fibers constituting the upper layer Goods.

<11>
The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and the inter-fiber distance of the upper layer is greater than the inter-fiber distance of the lower layer. The absorbent article according to any one of <1> to <10>.
<12>
The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and the difference between the inter-fiber distance of the upper layer and the inter-fiber distance of the lower layer The absorbent article according to any one of <1> to <11>, wherein (the former-the latter) is 0 μm or more and 50 μm or less.
<13>
The absorbent article according to any one of <1> to <12>, wherein the uneven nonwoven fabric has an average fiber diameter of 10 μm to 30 μm.
<14>
The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and an average diameter of fibers constituting the upper layer and fibers constituting the lower layer The absorbent article according to any one of <1> to <13>, wherein the ratio of the average diameter to the average diameter (the former / the latter) is 0.9 to 1.1.
<15>
<1> to <14>, wherein the absorbent article has a pair of side leakage grooves extending in the vertical direction on both sides of the skin-facing surface across the excretion spot portion in the horizontal direction. The absorbent article according to any one of 1.

<16>
The absorbent article according to any one of <1> to <15>, wherein the absorbent article has an annular leak-proof groove surrounding the excretion spot portion in the lateral direction on the skin facing surface.
<17>
The absorbent article according to <15> or <16>, wherein the leakage prevention groove is formed by embossing the top sheet and the absorbent body integrally toward the back sheet side.
<18>
The said leak-proof groove | channel is an absorbent article as described in said <17> formed by giving the embossing accompanying a heating and pressurization.
<19>
The absorbent article according to any one of <1> to <18>, wherein the absorbent article is in a state where the entire outer edge portion is joined.
<20>
The absorbent body includes an absorbent core and a core wrap that covers the skin-facing surface side of the absorbent core, and the absorbent core is formed by integral molding, any one of <1> to <19> 2. The absorbent article according to 1.

<21>
The absorbent article according to any one of <1> to <20>, wherein the uneven nonwoven fabric is hydrophilic in whole or in part in a thickness direction or a planar direction.
<22>
The absorbent article according to any one of <1> to <21>, wherein the absorbent includes an absorbent core, and the absorbent core contains a superabsorbent polymer.
<23>
The absorbent article according to any one of <1> to <22>, wherein the absorbent includes an absorbent core, and a deodorant is blended in the absorbent core.
<24>
The absorbent article according to any one of <1> to <23>, wherein the absorbent body includes an absorbent core, and the absorbent core contains an antibacterial agent.
<25>
The absorptivity according to any one of <1> to <24>, wherein the absorbent article includes a pair of wing portions on both lateral sides in the longitudinal intermediate portion (excretion portion facing portion) of the absorbent article. Goods.

<26>
Side leakage prevention having a free end not joined to the topsheet and a fixed end joined to the topsheet on both left and right sides of the topsheet of the absorbent article along the longitudinal direction (front-rear direction) The absorbent article according to any one of <1> to <25>, wherein a sheet is disposed.
<27>
The absorbent article according to any one of the above items <1> to <26>, wherein a pressure-sensitive adhesive is partially applied to a portion of the absorbent article that contacts the undergarment of the back sheet.
<28>
A liquid-permeable top sheet disposed on the skin facing surface side, a liquid-impermeable back sheet disposed on the non-skin facing surface side, and an absorbent disposed between these sheets An absorbent article, wherein the absorbent body has an absorbent core containing pulp fibers and a core wrap sheet that covers the absorbent core, and the core wrap covers the skin facing surface side of the absorbent core. In the sheet, the water-soluble cationic polymer is held in a state where the pores of the core wrap sheet are filled, and when the moisture permeates the core wrap sheet, the cationic polymer is dissolved, An absorptive article in which voids in the pores are increased.
<29>
The absorbent article according to <28>, wherein the cationic polymer is a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer, or a quaternary ammonium salt polycondensate.
<30>
The cationic polymer has a molecular weight of 10,000 or more and 22 million or less, a streaming potential of 1500 μeq / L or more and 13000 μeq or less, and an inorganic value / organic value of 0.6 or more and 4.6 or less as described in <29>. Absorbent articles.
<31>
<1> to <30, wherein the absorbent body has an absorbent core and a core wrap sheet covering the absorbent core, and the core wrap sheet covering the skin facing surface of the absorbent core is the lower member. > Any one of>.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the examples.
[Example 1]
A sanitary napkin having the same configuration as the sanitary napkin shown in FIGS. 1 and 2 was produced according to a conventional method. The following uneven nonwoven fabric A was used as the top sheet, and a moisture-impermeable resin film was used as the back sheet.
Convex and concave nonwoven fabric A: A heat-extensible fiber as a raw material was produced in accordance with the description in Examples of Japanese Patent Application Laid-Open No. 2005-350836 related to the applicant's previous application. Specifically, high-speed melt spinning was performed using polypropylene as the first resin component and high-density polyethylene as the second resin component as raw materials to obtain concentric core-sheath type heat-extensible fibers. The weight ratio of the first resin component to the second resin component was 50:50. The obtained fiber was a short fiber having a fiber length of 51 mm, and the short fiber was subjected to two-dimensional mechanical crimping. This fiber had a thermal elongation rate of 11.2%, a crimp rate of 11.8, a melting point of the first resin component of 163 ° C., and a melting point of the second resin component of 128 ° C. The spinning conditions are as follows.
・ Base temperature: 250 ℃
・ Spinning speed 2000m / min
-Fiber diameter: 3.8 dtex
・ Extension: None

The obtained heat stretched fiber was used as a raw material, which was supplied to a card machine to produce a card web having a basis weight of 30 g / m ² . The card web was embossed using an embossing device to obtain an embossed sheet. In the embossing roll in the embossing apparatus, the concave portions have a rhombic lattice pattern, and the convex portions have a rhombus shape. The area of each recess was 0.52 cm ² , and the ratio of the length Pc in the width direction to the length Pm in the machine direction of the recess (Pc / Pm) was 0.62. The heating temperature of the embossing roll 24 in the embossing apparatus was 120 ° C., and the heating temperature of the smooth roll was 120 ° C. The linear pressure was 9.8 MPa / cm. The surface of the concave portion in the embossing roll was subjected to fine uneven processing, and the surface roughness Ra was 50 μm. Moreover, the depth between the uneven | corrugated | grooved parts in an embossing roll was 1.0 mm. Next, hot air was blown onto the embossed sheet to perform air-through heat treatment. The temperature of the hot air was 136 ° C. The hot air was blown onto the embossed surface (that is, the surface on which the embossing roll contacted). In this way, an uneven nonwoven fabric A (basis weight 30 g / m ² ) having the form shown in FIGS. 5 and 6 was obtained.

The uneven nonwoven fabric A was used so that the surface on which many convex portions 25 exist was located on the skin facing surface side of the napkin. In the uneven nonwoven fabric A, the fiber density near the concave portion of the concave portion on the skin facing surface side was higher than the fiber density of the top portion of the convex portion. The absorbent core had a basis weight of 300 g / m ² , the basis weight of the superabsorbent polymer was 56 g / m ² , and AQUALIC CA manufactured by Nippon Shokubai Co., Ltd. was used as the superabsorbent polymer. The product thickness was 4.2 mm, and the absorber 4 was appropriately compressed for thickness adjustment. As the core wrap sheet for covering the absorbent core, a thin paper (tissue paper) having a basis weight of 16 g / m ² and a thickness of 0.3 mm was used.

A solution obtained by dissolving 5.00 g of the hemagglutinating agent having the following formulation in 100 g of ion-exchanged water over the entire area of the core wrap sheet is immersed in the core wrap sheet so as to have a basis weight of 120 g / m ² , and then placed in a dryer. Then, it was dried by allowing it to stand for 24 hours in an environment of 60 ° C., and the hemagglutinating agent contained in the dried core wrap sheet was 6 g / m ² . As the cationic polymer contained in the hemagglutinating agent, polydiallyldimethylammonium chloride which is a water-soluble quaternary ammonium salt homopolymer (trade name Marcoat 100 (weight average molecular weight: 150,000) manufactured by Nippon Lubrizol Co., Ltd.) Using.
[Prescription of hemagglutinating agent]
Polydiallyldimethylammonium chloride obtained by drying the marcoat 100 (weight average molecular weight: 150,000, streaming potential: 7488 μeq / L)

[Comparative Example 1]
A sanitary napkin was prepared in the same manner as in Example 1 except that the hemagglutinating agent was not applied to the core wrap sheet, and this was used as a sample of Comparative Example 1.

[Comparative Example 2]
A sanitary napkin was produced in the same manner as in Example 1 except that the following non-woven fabric F was used as the top sheet, and this was used as a sample of Comparative Example 2.
Non-woven fabric F: synthetic fiber (core-sheath type composite fiber with a core made of polyethylene terephthalate and a sheath made of polyethylene) having a fiber diameter of 3.3 dtex, a basis weight of 25 g / m ² , and a thickness of 0. A 5 mm air-through nonwoven was used without post-processing. This non-woven fabric F is a flat non-woven fabric having no irregularities on both the skin facing surface and the non-skin facing surface.

〔Evaluation test〕
About the sanitary napkin of an Example and a comparative example, (1) surface liquid return amount and (2) static maximum absorption amount were measured by the following method, respectively. The results are shown in Table 1.
The surface liquid return amount is an index indicating the difficulty of liquid return to the surface, and the smaller the amount, the less the menstrual blood and red blood cell aggregates adhere to the skin. It is an index indicating the maximum amount of blood that can be absorbed. The larger the static maximum absorption amount, the higher the absorption performance. As the simulated blood, the aforementioned simulated blood (viscosity 8 mPa · s) was used.

<Surface liquid return amount>
Place the sanitary napkin sample horizontally with the top sheet facing the top, and place a cylindrical acrylic plate with a 1 cm diameter injection port on the bottom, and inject 6 g of simulated blood from the injection port. The state was maintained for 1 minute. Next, the acrylic plate with a cylinder was removed, and 16 sheets of absorbent paper (commercially available tissue paper) having a length of 6 cm × width of 9.5 cm and a basis weight of 13 g / m ² were placed on the surface of the top sheet. Further, a weight was placed thereon so that the pressure was 20 × 98 Pa (20 gf / cm ² ), and pressure was applied for 5 seconds. After pressurization, the absorbent paper was taken out, the weight of the paper before and after pressurization was measured and subtracted, and the weight of the simulated blood absorbed in the paper was calculated and used as the surface liquid return amount (mg).

<Static maximum absorption>
A sanitary napkin sample is fixed on an acrylic plate, 3 g of pseudo blood is injected from the liquid discharge spot, and left to stand for 3 minutes after the liquid injection is completed, and then the liquid excretion point is set to 50 g per unit square centimeter for 1 minute. A load was applied. Thereafter, the same operation was repeated, and when the liquid exuded from the wing portion of the sanitary napkin, the operation was completed, and the static maximum absorption amount (g) was obtained.

From the results shown in Table 1, the sanitary napkin (product of the present invention) of Example 1 uses an uneven nonwoven fabric as a surface sheet and has a static maximum absorption amount by arranging a hemagglutinating agent on the lower member. It can be seen that more menstrual blood can be absorbed and the erythrocyte aggregate is less likely to return to the surface. On the other hand, the sanitary napkin of Comparative Example 1 in which no hemagglutinating agent is disposed on the lower member does not improve the static maximum absorption amount, and exhibits an aggregation effect on the absorption performance of the napkin. It turns out that there is no. Furthermore, it can be seen that the amount of surface liquid return is large, and when pressure is applied during wearing, the agglomerates of erythrocytes easily migrate to the surface of the surface sheet that easily comes into contact with the wearer's skin. Moreover, although the hemagglutinating agent is included in the lower member, the sanitary napkin of Comparative Example 2 using a flat nonwoven fabric as the top sheet has a better static maximum absorption than Comparative Example 1, It can be seen that the amount of surface liquid return is large, and when pressure is applied during wearing, the agglomerates of erythrocytes easily migrate to the surface of the surface sheet that easily contacts the wearer's skin.
According to the absorbent article of the present invention, both the inclusion of the hemagglutinating agent in the lower member and the use of the uneven nonwoven fabric as the surface sheet allow the liquid to migrate to the surface and the napkin can absorb menstrual blood. It turns out that it is important from the viewpoint of balancing the maximum absorption amount.

[Examples 2 to 3]
A sanitary napkin was prepared in the same manner as in Example 1 except that the prescription of the hemagglutinating agent was changed to the following.
Example 2: Polydiallyldimethylammonium chloride obtained by drying trade name PAS-H-5L manufactured by Nitto Bo Medical Co., Ltd. (weight average molecular weight: 30,000, streaming potential 7447 μeq / L, IOB 2.1)
Example 3: Polydiallyldimethylammonium chloride obtained by drying a poly (diallyldimethylammonium chloride) solution manufactured by Aldrich (weight average molecular weight: 400,000 to 500,000, streaming potential 6827 μeq / L, IOB 2.1 )

Example 4
In Example 2, as a surface sheet, a surface sheet having a ridge groove structure that was peeled off by cooling the product from Unicharm's “Hadamoi no Michi to normal daily wings 21 cm” A sanitary napkin was produced in the same manner as in Example 2 except that the grooves each extended in the longitudinal direction of the sanitary napkin and were bonded to the skin facing surface side.

[Evaluation]
With respect to the samples of Examples 1 to 4 (sanitary napkins) and the samples of Comparative Examples 1 to 2 (sanitary napkins), the dynamic maximum absorption amount was evaluated by the following method. Further, the surface liquid return amount (mg) was evaluated by the same method as in Example 1. The results are shown in Table 2 below.

<Dynamic maximum absorption>
A sample of a sanitary napkin was fixed to a sanitary short and attached to a dynamic model of a human body having an excretion opening provided with a liquid injection tube. The walking motion of the dynamic model was started, and 1 minute after the start of the walking motion, 2 g of simulated blood was injected from the excretion opening (first time). Furthermore, 2 g of simulated blood was injected 3 minutes after the end of the first liquid injection (second time). Furthermore, 2 g of simulated blood was injected 3 minutes after the end of the second liquid injection (third time). The third and subsequent liquid injections were repeated when 2 g of simulated blood was repeatedly injected 3 minutes after the liquid injection, and ended when the liquid oozed out from the wing part of the sanitary napkin, and the dynamic maximum absorption amount (g) was obtained. .

From the results shown in Table 2, the sanitary napkins of the first to fourth embodiments (products of the present invention) have an improved dynamic maximum absorption and a surface liquid return amount as compared with the sanitary napkins of the comparative examples 1 and 2. It can be seen that is significantly improved.

[Examples 5 to 8 and Comparative Examples 3 to 4]
The absorbent core used in each of Examples 1 to 4 and Comparative Examples 1 and 2 was the same except that the basis weight of the wood pulp fiber was changed to 280 g / m ² and the basis weight of the superabsorbent polymer was changed to 29 g / m ^2. A sanitary napkin having a thickness of 4.0 mm was prepared as Examples 5 to 8 and Comparative Examples 3 to 4. The dynamic maximum absorption amount and the surface liquid return amount were evaluated in the same manner as in Examples 1 to 4 and Comparative Examples 1 and 2 described above.

As shown in Table 3, even with the sanitary napkins of Examples 5 to 8 in which the blending amount of the polymer is relatively small, the physiological absorptive agent is not included in the suppression of the dynamic maximum absorption amount and the surface liquid return amount. It can be seen that this is improved as compared with the napkin for use (Comparative Example 3) and the hemagglutinating agent on the non-skin side of the absorbent (Comparative Example 4). As in Examples 1 to 4, the absorption performance can be significantly improved if the amount of the polymer is relatively large, but it is effective in that the absorption performance can be improved even when the amount of the polymer is small.

According to the absorbent article of the present invention, agglomerates of red blood cells produced by contact of a hemagglutinating agent with menstrual blood are less likely to adhere to the skin, and are excellent in menstrual blood absorption performance and wearing feeling.

Claims (31)

1. A liquid-permeable surface sheet that forms a skin-facing surface, a back sheet that forms a non-skin-facing surface, and an absorber disposed between both sheets, and a longitudinal direction and a longitudinal direction along the front-rear direction of the wearer An absorbent article for menstrual blood absorption having a transverse direction perpendicular to
   The surface sheet is made of an uneven nonwoven fabric having unevenness on at least the skin facing surface side,
   An absorptive article, wherein a hemagglutinating agent is contained in a lower member disposed closer to the back sheet than the non-skin facing surface of the top sheet.
2. The absorbent article according to claim 1, wherein the uneven nonwoven fabric has a fiber density in the vicinity of the concave portion of the concave portion on the skin facing surface side higher than a fiber density at the top portion of the convex portion.
3. The absorbent article according to claim 1 or 2, wherein the uneven nonwoven fabric has the uneven protrusions arranged in a dotted pattern in a plan view.
4. The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and the fiber density of the lower layer is higher than the fiber density of the upper layer. 4. The absorbent article according to any one of 1 to 3.
5. The absorbent article according to any one of claims 1 to 4, wherein the concave and convex portions on the skin facing surface side of the concave and convex nonwoven fabric are solid inside.
6. The absorbent article according to any one of claims 1 to 5, wherein the uneven nonwoven fabric has a distance between the tops of the protrusions of the unevenness of 0.5 to 10.0 mm in plan view.
7. The absorbent article according to any one of claims 1 to 6, wherein the concave-convex nonwoven fabric has a width of the concave-convex recess of 0.2 mm to 3.0 mm in plan view.
8. The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and the upper layer is formed using heat-extensible fibers, and the heat stretching 2. The fiber-bonding portion is formed by joining the intersections of the stretchable fibers, and the lower layer does not include the heat-extensible fibers or includes the heat-extensible fibers at a lower ratio than the upper layer. 8. The absorbent article according to any one of 1 to 7.
9. The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and an interface between the upper layer and the lower layer is bonded to each other. The absorbent article according to any one of claims 1 to 8, further comprising a non-fixed portion in which the upper layer and the lower layer are detachably laminated.
10. The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and an average diameter of fibers constituting the upper layer and fibers constituting the lower layer The absorbent article according to any one of claims 1 to 9, wherein the average diameter is substantially the same, or the average diameter of the fibers constituting the lower layer is larger than the average diameter of the fibers constituting the upper layer.
11. The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and the inter-fiber distance of the upper layer is greater than the inter-fiber distance of the lower layer. The absorbent article according to any one of claims 1 to 10.
12. The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and the difference between the inter-fiber distance of the upper layer and the inter-fiber distance of the lower layer The absorbent article according to any one of claims 1 to 11, wherein, as the former-the latter, is 0 μm or more and 50 μm or less.
13. The absorbent article according to any one of claims 1 to 12, wherein the uneven nonwoven fabric has an average fiber diameter of 10 µm to 30 µm.
14. The uneven nonwoven fabric has an upper layer disposed on the skin facing surface side and a lower layer disposed on the non-skin facing surface side from the upper layer, and an average diameter of fibers constituting the upper layer and fibers constituting the lower layer The absorbent article according to any one of claims 1 to 13, wherein the ratio of the average diameter of the former is 0.9 to 1.1 as the former / the latter.
15. The absorbent article according to any one of claims 1 to 14, wherein the absorbent article has a pair of side leakage preventing grooves extending in the longitudinal direction on both sides of the skin-facing surface across the excretion spot portion in the lateral direction. The absorbent article according to item 1.
16. The absorbent article according to any one of claims 1 to 15, wherein the absorbent article has an annular leak-proof groove surrounding the excretion spot portion in the lateral direction on the skin facing surface.
17. The absorbent article according to claim 15 or 16, wherein the leakage preventing groove is formed by embossing the top sheet and the absorbent body toward the back sheet side.
18. The absorbent article according to claim 17, wherein the leak-proof groove is formed by embossing with heating and pressurization.
19. The absorbent article according to any one of claims 1 to 18, wherein the absorbent article is in a state in which the entire outer periphery is joined.
20. The absorbent body according to any one of claims 1 to 19, wherein the absorbent body includes an absorbent core and a core wrap that covers a skin facing surface side of the absorbent core, and the absorbent core is formed by integral molding. The absorbent article as described.
21. The absorbent article according to any one of claims 1 to 20, wherein the uneven nonwoven fabric is hydrophilic in whole or in part in a thickness direction or a planar direction.
22. The absorbent article according to any one of claims 1 to 21, wherein the absorbent includes an absorbent core, and the absorbent core contains a superabsorbent polymer.
23. The absorbent article according to any one of claims 1 to 22, wherein the absorbent body includes an absorbent core, and the absorbent core contains a deodorant.
24. The absorbent article according to any one of claims 1 to 23, wherein the absorbent body includes an absorbent core, and the absorbent core contains an antibacterial agent.
25. The absorbent article according to any one of claims 1 to 24, further comprising a pair of wing parts on both lateral sides in the middle part in the longitudinal direction of the absorbent article.
26. Side leakproof sheets having a free end not joined to the topsheet and a fixed end joined to the topsheet are arranged on both the left and right sides of the topsheet of the absorbent article along the longitudinal direction. The absorbent article according to any one of claims 1 to 25.
27. The absorbent article according to any one of claims 1 to 26, wherein an adhesive is partially applied to a part of the absorbent article that contacts the undergarment of the back sheet.
28. A liquid-permeable surface sheet that forms a skin-facing surface, a back sheet that forms a non-skin-facing surface, and an absorber disposed between both sheets, and a longitudinal direction and a longitudinal direction along the front-rear direction of the wearer An absorbent article for menstrual blood absorption having a transverse direction perpendicular to
    The surface sheet is made of an uneven nonwoven fabric having unevenness on at least the skin facing surface side,
    An absorptive article in which a cationic polymer is contained in a lower member arranged nearer to the back sheet than a non-skin facing surface of the top sheet.
29. The absorbent article according to claim 28, wherein the cationic polymer is a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer or a quaternary ammonium salt polycondensate.
30. The absorbent article according to claim 29, wherein the cationic polymer has a molecular weight of 10,000 to 3,000,000.
31. The absorbent body has an absorbent core and a core wrap sheet that covers the absorbent core, and the core wrap sheet that covers the skin facing surface of the absorbent core is the lower member. The absorbent article of Claim 1.

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