JP6259539B2 - Sanitary absorbent articles - Google Patents

Description

  The present invention relates to a sanitary absorbent article.

  Generally, a sanitary napkin includes a groove formed by pressing a top sheet and an absorbent body integrally. When such a groove is provided, it is possible to prevent side leakage that occurs when the menstrual blood of the wearer flows on the top sheet. However, the portion located outside the groove in the absorber cannot be used effectively, and menstrual blood held only in the portion located inward from the groove in the absorber returns to the surface sheet side. There was a case.

  As another technique, a technique for improving various performances of the absorbent article by applying an agent that acts on the blood itself to change the state of the blood to the absorbent article is known. Patent Document 1 discloses a technique related to a menstrual band containing an inorganic metal salt, and hemoglobin in menstrual blood is agglomerated by the metal inorganic salt and passes through a colorless fluid for absorption in other parts of the pad. It is said that. Patent Document 2 discloses a sanitary napkin containing a blood gelling agent, and exemplifies a partially hydrated dicarboxylic anhydride copolymer or polycation as the blood gelling agent. Moreover, in patent document 2, although the form by which a blood gelling agent is mainly arrange | positioned at a back surface sheet is demonstrated, when using in combination with a flow direction instruction | indication means, it concentrates along the terminal or end of an embossed line. There is a statement to the effect. Patent Document 3 discloses a personal care absorbent article comprising a porous nonwoven web treated with a fluid treatment agent suitable for modifying red blood cells, comprising triblock containing polypropylene oxide and polyethylene oxide as fluid treatment agents Examples are polymers or polycations.

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

  The menstrual band described in Patent Document 1 is capable of aggregating red blood cell components, but the absorption means of the colorless fluid component that has been filtered and passed is not sufficient, and is formed at an early stage of menstrual blood that is continuously discharged. Agglomerates interfere with late menstrual absorption. Further, it is described that it is sufficient that there is no contamination by reddish even if a colorless fluid component leaks, and the leakage of plasma components is neglected. In the absorbent article described in Patent Document 2, the embossed form is unknown, and the blood gelling agent is concentrated along the end of the embossed wire or along the end thereof. Cannot be fully utilized. Furthermore, in Patent Document 3, red blood cell clusters are trapped between the fibers of the nonwoven web, but it is difficult to ensure blood absorption by the mechanism continuously.

  Therefore, the subject of this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.

  The present invention comprises an absorbent containing a superabsorbent polymer, and a top sheet and a back sheet sandwiching the absorbent, and a longitudinal direction corresponding to the wearer's front-rear direction and a transverse direction perpendicular to the longitudinal direction. A sanitary absorbent article comprising a groove having a bottom on the back sheet side in which the top sheet and the absorbent body are integrated on the skin facing surface, the absorbent body or the skin facing surface side thereof A hemagglutinating agent, and the absorbent body has a first slit extending outwardly in the longitudinal direction or the lateral direction from a position overlapping the groove in plan view of the sanitary absorbent article The present invention provides a sanitary absorbent article having

  According to the sanitary absorbent article of the present invention, it is possible to utilize a wide area of the absorbent body. For this reason, it can be expected that menstrual blood is prevented from leaking.

FIG. 1 is a plan view of a sanitary napkin which is a preferred embodiment of a sanitary absorbent article for menstrual absorption according to the present invention. FIG. 2 is a plan view showing the skin facing surface side (surface sheet side) of the absorbent body of the sanitary napkin shown in FIG. 3 is a cross-sectional view schematically showing a cross section taken along line III-III in FIG. FIG. 4 is an enlarged cross-sectional view of an absorbent body included in the sanitary napkin shown in FIG. FIG. 5 is an enlarged schematic cross-sectional view of a main part of one absorbent sheet constituting the absorbent body shown in FIG. FIG. 6 is an enlarged plan view of a main part showing the positional relationship between the slits and the compressed grooves provided in the sanitary napkin shown in FIG. 1. FIG. 7 is a perspective view of the topsheet provided in the sanitary napkin shown in FIG. FIG. 8 is a plan view of a sanitary napkin which is another embodiment of the sanitary absorbent article of the present invention.

  Hereinafter, the sanitary absorbent article of the present invention (hereinafter also referred to simply as an absorbent article) is referred to the drawings based on a sanitary napkin 1 (hereinafter also referred to as “napkin 1”) which is a preferred embodiment thereof. I will explain. The napkin 1 includes an absorbent body 4 containing a superabsorbent polymer 41, a top sheet 2 and a back sheet 3 sandwiching the absorbent body 4, and a longitudinal direction X corresponding to the wearer's front-rear direction and the longitudinal direction X. Has a transverse direction Y perpendicular to. FIG. 1 shows a plan view of a napkin 1 which is a preferred embodiment of the sanitary absorbent article of the present invention, and FIG. 2 shows the skin facing surface side (surface sheet) of the absorbent body shown in FIG. The side view is shown. FIG. 3 shows a cross-sectional view of the napkin 1. In addition, the sanitary absorbent article of the present invention is preferably used at the time of menstruation in women and is preferable for menstrual blood absorption.

  The sanitary absorbent article of the present invention contains a hemagglutinating agent on the skin-facing surface side of the absorbent body or the absorbent body. In the napkin 1 of the present embodiment, the absorbent body 4 contains a hemagglutinating agent 8, and a plurality of slits 44 described later are formed in the absorbent body 4 as shown in FIGS. 1 and 2. Preferably, the napkin 1 has a multilayer structure in which the absorbent body 4 is formed of an absorbent sheet, as shown in FIG. Specifically, the absorbent sheet has a structure in which a plurality of layers are overlapped in the thickness direction. In the napkin 1, the hemagglutinating agent 8 is disposed on the absorbent body 4 formed from an absorbent sheet. That is, in the napkin 1 of the present embodiment, the absorbent body 4 formed from the absorbent sheet contains the superabsorbent polymer 41, the constituent fibers, and the hemagglutinating agent 8. In this embodiment, the napkin 1 is interposed between the liquid-permeable surface sheet 2 that forms the skin-facing surface, the back sheet 3 that forms the non-skin-facing surface, and both the sheets 2 and 3. It has the absorptive main body 10 which comprises the absorber 4 which becomes.

  As shown in FIG. 1, the absorbent main body 10 of the napkin 1 is a wearer than the excretion part facing part B, which is disposed opposite to the excretion part (vagina mouth or the like) of the wearer when worn, and the wearer facing part B. The front part A is arranged closer to the stomach side (front side) and the rear part C is arranged closer to the wearer's back side (rear side) than the excretory part facing part B. The napkin 1 and the absorbent main body 10 have a longitudinal direction X corresponding to the wearer's front-rear direction and a transverse direction Y orthogonal to the longitudinal direction X. That is, the absorbent main body 10 is divided in the order of the front part A, the excretory part opposing part B, and the rear part C in the vertical direction X.

  Moreover, in this specification, a skin opposing surface is a surface in the napkin 1 or its component (for example, surface sheet 2) orient | assigned to a wearer's skin side at the time of wear of the napkin 1, and a non-skin opposing surface is a napkin. 1 or a component thereof, which is a surface directed to the side opposite to the skin side (clothing side) when the napkin 1 is worn. Further, the longitudinal direction X coincides with the longitudinal direction of the napkin 1 and the absorbent main body 10, and the lateral direction Y coincides with the width direction (direction orthogonal to the longitudinal direction) of the napkin 1 and the absorbent main body 10.

  In this embodiment, as shown in FIGS. 1 and 3, the napkin 1 is further laterally extended from both side portions along the longitudinal direction X of the excretory part-facing portion B of the absorbent main body 10 in addition to the absorbent main body 10. It has a pair of wing parts 10W and 10W extending outward of Y.

  In the sanitary absorbent article of the present invention, when the excretory part facing part B has the wing part 10W like the napkin 1 of the present embodiment, the longitudinal direction of the absorbent article (the longitudinal direction of the absorbent article) , Means a region having a wing portion 10W (a region sandwiched between a root along the longitudinal direction X of one wing portion 10W and a root along the longitudinal direction X of the other wing portion 10W). . The excretion part opposing part B in the absorbent article which does not have a wing part is produced when the absorbent article is folded into a three-fold individual packaging form. With respect to two folding curves (not shown) crossing in the Y direction in the middle, it means a region surrounded by the first folding curve and the second folding curve counted from the front end in the longitudinal direction X of the absorbent article. To do.

  In the napkin 1 of the present embodiment, the top sheet 2 covers the entire skin facing surface of the absorbent body 4 as shown in FIGS. 1 and 3, and laterally extends from both side edges along the longitudinal direction X of the absorbent body 4. Y extends outside. On the other hand, the back sheet 3 covers the entire area of the non-skin facing surface of the absorbent body 4 and further extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4 to be described later. In addition, a side flap portion 10S is formed. The top sheet 2 and the back sheet 3 are joined to each other by known joining means such as an adhesive, heat seal, ultrasonic seal, and the like, at portions extending from both end edges in the longitudinal direction X of the absorber 4. In addition, between each of the top sheet 2 and the back sheet 3 and the absorbent body 4 may be joined by an adhesive.

  In the napkin 1, the side sheet | seat 7 is distribute | arranged to the both sides along the vertical direction X in the skin opposing surface (skin opposing surface of the surface sheet 2) of the absorptive main body 10, as shown in FIG.1 and FIG.3. Preferably, the side sheet 7 is arranged over the entire length in the longitudinal direction X of the absorbent main body 10 so as to overlap the left and right side portions along the longitudinal direction X of the absorbent body 4 in plan view.

  In the napkin 1, as shown in FIG. 1, the pair of side sheets 7 and 7 each have a linear first joining line 61 located in the excretory part facing part B and the longitudinal direction X of the first joining line 61. Are joined to the topsheet 2 by linear second joining lines 62 located in the front and rear (front part A and rear part C). In the napkin 1, the first joining lines 61 have a curved shape that protrudes outward in the lateral direction Y in plan view, and the second joining lines 62 extend so as to alternately intersect in the longitudinal direction in plan view. It is linear (zigzag linear). Thus, when the side sheet 7 is joined to the surface sheet 2 by the first joining line 61 and the second joining line 62 and fixed to the skin facing surface of the absorbent main body 10, as shown in FIG. A space P defined by the side sheet 7 and the top sheet 2 is formed inward in the lateral direction Y with respect to the first joint line 61 and the second joint line 62. Since the space P is opened toward the center in the lateral direction Y of the absorbent main body 10, body fluid such as menstrual blood flowing outward from the center in the lateral Y is accommodated in the space P. As a result, leakage of body fluid can be effectively prevented. It should be noted that a pair of leak-proof cuffs along the vertical direction X may be arranged by disposing an elastic member extending in the vertical direction X at the free ends of the pair of side sheets 7, 7. The leak-proof cuff has an upright property and can prevent the side leakage of menstrual blood disposed on the skin facing surface.

  In the napkin 1, as shown in FIG. 1, the side flap part 10S protrudes greatly outward in the lateral direction Y at the excretory part facing part B, and thereby the left and right along the longitudinal direction X of the absorbent main body 10 A pair of wing portions 10W and 10W are extended on both sides.

  The wing portion 10W is used by being folded back to the non-skin facing surface side of the crotch portion of clothes such as shorts. In the napkin 1, the wing portion 10 </ b> W has a substantially trapezoidal shape in which a lower base (a side longer than the upper base) is located on a side portion along the longitudinal direction X of the absorbent main body 10 in a plan view as illustrated in FIG. 1. It has a shape. A wing portion adhesive portion (not shown) for fixing the wing portion 10W (napkin 1) to clothes (not shown) such as shorts is formed on the non-skin facing surface of the wing portion 10W. The wing portion 10W folded back to the non-skin facing surface (outer surface) side of the crotch portion of the clothes can be adhesively fixed to the crotch portion by the adhesive portion during use. Moreover, the main body adhesion part (not shown) for fixing the absorptive main body 10 to clothes, such as shorts, is also formed in the non-skin opposing surface of the absorptive main body 10.

  The sanitary absorbent article of the present invention includes a groove having a bottom on the back sheet side, in which the top sheet and the absorbent body are integrated. Here, the “integrated groove” refers to a groove in which both the top sheet and the absorbent body are recessed and have a bottom of the groove. As shown in FIGS. 1 and 3, the napkin 1 of the present embodiment has a surface sheet 2 and an absorbent body 4 on the back surface of the absorbent main body 10 (skin facing surface of the surface sheet 2), as shown in FIGS. 1 and 3. A linear squeezing groove 9 is provided which is recessed integrally toward the sheet 3 side. Therefore, the compressed groove 9 is a groove in which the density of each fiber as a constituent member is higher than the density of the peripheral portion of the groove with respect to the top sheet 2 and the absorbent body 4. “Linear” in the linear compressed groove 9 means that the shape of the groove (concave portion) is not limited to a straight line in a plan view but includes a curved line. Each line may be a continuous line or a discontinuous line such as a broken line. For example, the squeezing groove 9 may be composed of a row formed by a number of discontinuous point embosses.

  In the napkin 1, as shown in FIG. 1, the pressing groove 9 has a portion extending in the longitudinal direction X while being curved on each of both side portions along the longitudinal direction X in the excretory part facing portion B. ing. Preferably, in the napkin 1, the compressed groove 9 includes a lateral compressed groove 91 extending in the lateral direction Y at the front part A and the rear part C, and a vertical compressed groove extending in the longitudinal direction X on both sides of the excretory part facing part B. 92. In the napkin 1, the lateral squeezing grooves 91 of the front part A and the rear part C extend in the lateral direction Y while forming a convex curved shape outward in the longitudinal direction X. Moreover, each vertical pressing groove 92 is extended in the vertical direction X, forming the convex curvilinear shape toward the inner side of the horizontal direction Y in the side part along the vertical direction X in the excretion part opposing part B. As shown in FIG. In the napkin 1, the lateral pressing groove 91 of the front part A, one vertical pressing groove 92, the horizontal pressing groove 91 of the rear part C, and the other vertical pressing groove 92 are connected to form a ring-shaped circumferential groove. . The compressed groove 9 formed in this way can effectively prevent liquid leakage from the periphery of the napkin 1 by suppressing diffusion of body fluid flowing in the plane direction on the top sheet 2.

  FIG. 4 shows an enlarged cross-sectional view of the absorbent body 4 in the cross-sectional view shown in FIG. Moreover, the principal part expanded sectional view of one absorbent sheet which comprises the absorber 4 shown in FIG. 4 is shown by FIG. As shown in FIG. 5, in the napkin 1, one absorbent sheet includes a superabsorbent polymer 41 that is three-dimensionally distributed, constituent fibers, and a hemagglutinating agent 8. The absorbent sheet has a polymer-rich region PT having a relatively high mass ratio of the superabsorbent polymer 41 to the total mass of the constituent fibers and the superabsorbent polymer 41 in a cross-sectional view, and the polymer-rich region. It has a fiber rich region FT that is relatively lower than PT. In the napkin 1, the polymer rich region PT and the fiber rich region FT are divided in the thickness direction of the absorbent body 4 made of an absorbent sheet. As the absorbent sheet, the adhesive force generated in the wet superabsorbent polymer 41 and a binder such as an adhesive or an adhesive fiber added separately, between the constituent fibers, or between the superabsorbent polymer 41 and the constituent fiber, A sheet or the like that is bonded between the two can be preferably used. In addition, an absorptive sheet | seat is an absorber currently shape | molded by the sheet form, and generally distinguishes it from the absorber of the structure where the absorptive material was piled up. Typical examples of the absorbent sheet include those described in Japanese Patent No. 2963647 and those described in Japanese Patent No. 2955223.

  The superabsorbent polymer 41 contained in the absorbent body 4 is generally in the form of particles, but may be fibrous. 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.

  Examples of the constituent fibers of the absorbent body 4 include synthetic fibers and cellulosic fibers. As a synthetic fiber, it is preferable that it is a thermoplastic fiber, for example. For example, the thermoplastic fiber is formed using a single fiber formed using a single synthetic resin such as polyethylene, polypropylene, polyester, polyurethane, or a synthetic resin such as a composite of two or more of these. A composite fiber is mentioned. Examples of the cellulosic fibers include crosslinked cellulose fibers (pulp fibers) obtained by crosslinking cellulose molecules between or between molecules with an appropriate crosslinking agent, or regenerated cellulose fibers such as rayon fibers having improved cellulose crystallinity. It is done.

  The hemagglutinating agent 8 provided in the napkin 1 acts to agglutinate erythrocytes in blood to form aggregates and separate them from plasma components. A preferred hemagglutinating agent has a property that, when 1000 ppm is added to pseudo blood, at least two or more red blood cells aggregate to form an aggregate in a state where the fluidity of blood is maintained. Here, “the state in which the fluidity of blood is maintained” means that 10 g of pseudo blood to which a measurement sample agent is added 1000 ppm is screw tube bottle (product number “Screw tube No. 4” manufactured by Maruem Co., Ltd., the inner diameter of the mouth is 14.5 mm, This means a state in which 60% or more of the simulated blood flows down within 20 seconds when the screw tube bottle containing the simulated blood is turned 180 degrees. Pseudo-blood is a type B viscometer (manufactured by Toki Sangyo Co., Ltd., model number TVB-10M, measurement conditions: rotor No. 19, 30 rpm, 25 ° C., 60 seconds) so that the viscosity is 8 mPa · s. The blood cell / plasma ratio of defibrinated horse blood (manufactured by Nippon Biotest Laboratories, Inc.) was prepared. Further, whether or not “two or more red blood cells aggregate to form an aggregate” is determined as follows. That is, the simulated blood to which the measurement sample agent 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, Inc., model number: LA-950V2, measurement condition: flow cell). The average median diameter of the volume particle diameter measured at a temperature of 25 ° C. by a laser diffraction scattering method using a measurement, a circulation speed of 1 and no ultrasonic wave corresponds to the size of an aggregate in which two or more red blood cells are aggregated. When it is 10 μm or more, it is determined that “two or more red blood cells aggregate to form an aggregate”.

  As the hemagglutinating agent 8 used in the sanitary absorbent article of the present invention, a cationic polymer is suitable. Examples of the cationic polymer include cationized cellulose and cationized starch such as hydroxypropyltrimonium chloride. The hemagglutinating agent 8 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. When the hemagglutinating agent 8 includes a quaternary ammonium salt homopolymer and / or a quaternary ammonium salt copolymer and / or a quaternary ammonium salt polycondensate as the cationic polymer, the hemagglutinating agent 8 is , Quaternary ammonium salt homopolymer, quaternary ammonium salt copolymer and quaternary ammonium salt polycondensate may be included, or any combination of two or more may be included. You may go out. 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 singly 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. In the present specification, the “hemagglutinating agent” refers to the aggregation of erythrocytes by a single compound capable of aggregating blood erythrocytes, or a plurality of combinations of the single compounds, or a combination of a plurality of compounds. It is an agent that develops. That is, the hemagglutinating agent is an agent limited to those having a hemagglutinating action. 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.

  Among 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 is advantageous 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.

  A 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.

  As a result of the study of the present inventors, it has been found that it is particularly effective to use a cationic polymer in order to produce an aggregate of red blood cells during menstrual blood. The reason for this 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.

  From the viewpoint of effectively producing an aggregate of erythrocytes, 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. 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. Moreover, you may combine 2 or more types of cationic polymers of different molecular weight within the above-mentioned molecular weight range. 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 and an analytical column α-M manufactured by Tosoh Corporation 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.

In the case of using a quaternary ammonium salt polymer as the cationic polymer, it is preferable that the quaternary ammonium salt polymer has a flow potential of 1500 μeq / L or more from the viewpoint of more effectively generating red blood cell aggregates. , More preferably 2000 μeq / L or more, still more preferably 3000 μeq / L or more, still more preferably 4000 μeq / L or more. When the flow potential of the quaternary ammonium salt polymer is not less than these values, the electric double layer of erythrocytes can be sufficiently neutralized. The upper limit of the streaming potential is preferably 13000 μeq / L or less, more preferably 8000 μeq / L or less, and even more preferably 6000 μeq / L or less. When the flow potential of the quaternary ammonium salt polymer is below these values, the electrical repulsion between the quaternary ammonium salt polymers adsorbed on the erythrocytes can be effectively prevented. The streaming potential of the quaternary ammonium salt polymer is preferably 1500 μeq / L or more and 13000 μeq / L, more preferably 2000 μeq / L or more and 13000 μeq / L or less, and 3000 μeq / L or more and 8000 μeq / L or less. Is more preferably 4000 μeq / L or more and 6000 μeq / L or less. The flow potential of the quaternary ammonium salt polymer adjusts, for example, the molecular weight of the constituting cationic monomer itself, and the copolymerization molar ratio of the cationic monomer and the anionic monomer or nonionic monomer constituting the copolymer. Can be controlled. The streaming potential of the quaternary ammonium salt polymer can be measured using a streaming potential measuring device (PCD04) manufactured by Spectris Co., Ltd. Specific measurement conditions are as follows. First, hot melt bonding each member to a commercially available napkin is invalidated using a dryer or the like, and decomposed into members such as a top sheet, an absorber, and a back sheet. For each decomposed member, a multi-stage solvent extraction method from a nonpolar solvent to a polar solvent is performed to separate the treating agent used in each member to obtain a solution containing a single composition. The obtained solution was dried and solidified, and 1H-NMR (nuclear magnetic resonance method), IR (infrared spectroscopy), LC (liquid chromatography), GC (gas chromatography), MS (mass spectrometry), GPC (gel) Permeation chromatography) and fluorescent X-rays are combined to identify the structure of the treatment agent. With respect to a measurement sample in which 0.001 g of a treatment agent (quaternary ammonium salt polymer) to be measured is dissolved in 10 g of physiological saline, a 0.001N sodium polyethylene sulfonate aqueous solution (if the measurement sample has a negative charge) , 0.001N polydiallyldimethylammonium chloride aqueous solution) is titrated, and the titer XmL required until the potential difference between the electrodes disappears is measured. Thereafter, the streaming potential of the quaternary ammonium salt polymer is calculated by Equation 1.
Streaming potential = (X + 0.190 *) × 1000 Equation 1
(* Titration required for the physiological saline solution)

  In order for the cationic polymer to be successfully adsorbed on the surface of erythrocytes, it is advantageous that the cationic polymer is likely to interact with sialic acid present on the surface of erythrocytes. From this point of view, the present inventors proceeded with studies, and as a result, inorganic value / organic value (hereinafter referred to as “IOB (Inorganic Organic Balance) value”), which is the ratio between the inorganic value and the organic value of the substance. It was found that the degree of interaction between the sialic acid conjugate and the cationic polymer can be evaluated on the basis of. Specifically, it has been found advantageous to use a cationic polymer having an IOB value that is the same as or close to that of the sialic acid conjugate. The sialic acid conjugate is a compound in which sialic acid can exist in a living body, and examples thereof include a compound in which sialic acid is bound to the end of a glycolipid such as galactolipid.

  In general, the properties of a substance are largely governed by various intermolecular forces between molecules, and this intermolecular force mainly consists of Van Der Waals force due to molecular mass and electrical affinity due to molecular polarity. If the Van Der Waals force, which has a great influence on changes in the properties of substances, and the electric affinity can be grasped individually, the properties of unknown substances or their mixtures can be predicted from the combination. be able to. This idea is a theory well known as “organic conceptual diagram”. Conceptual diagram of organic materials is, for example, “Organic analysis” written by Kei Fujita (Kanya Shoten, Showa 5), “Organic qualitative analysis: Systematic. Pure products” by Kyoda Fujita (Kyoritsu Shuppan, 1953) "Reform Chemistry Experiments-Organic Chemistry" by Kawasaki Sho (1971), "Systematic Organic Qualitative Analysis (mixture)" by Kaoru Fujita and Masami Akatsuka (Kasama Shobo, 1974), and Yoshio Koda It is described in detail in Shiro Sato and Yoshio Honma's “New Edition Organic Conceptual Diagram Basics and Applications” (Sankyo Publishing, 2008). In the organic conceptual diagram, regarding the physicochemical properties of materials, the degree of physical properties mainly due to Van Der Waals force is called “organic”, and the degree of physical properties mainly due to electrical affinity is called “inorganic”. The physical properties of substances are considered as a combination of “organic” and “inorganic”. Then, one carbon (C) is defined as organic 20, and the inorganic and organic values of various polar groups are defined as shown in Table 1 below. The sum of the values is obtained, and the ratio between the two is defined as the IOB value. In the present invention, the IOB value of the sialic acid conjugate described above is determined based on these organic and inorganic values, and the IOB value of the cationic polymer is determined based on the value.

  Specifically, when the cationic polymer is a homopolymer, the inorganic value and the organic value are determined based on the repeating unit of the homopolymer, and the IOB value is calculated. For example, in the case of polydiallyldimethylammonium chloride, which is a cationic polymer used in Examples described later, an organic value of -C-x8 = 160, an inorganic value of Ammo and NH4 salt x1 = 400, Ring (non-aromatic single ring) × 1 = 10 inorganic value, −Cl × 1 = 40 organic value, and 10 inorganic value, the total inorganic value is 400 + 10 + 10 = 420, The sum of the organic values is 160 + 40 = 200. Therefore, the IOB value is 420/200 = 2.10.

  On the other hand, when the cationic polymer is a copolymer, the IOB value is calculated by the following procedure according to the molar ratio of the monomers used for the copolymerization. That is, a copolymer is obtained from monomer A and monomer B, the organic value of monomer A is ORA, the inorganic value is INA, the organic value of monomer B is ORB, and the inorganic value is INB. Yes, when the molar ratio of monomer A / monomer B is MA / MB, the IOB value of the copolymer is calculated from the following equation.

  The IOB value of the cationic polymer thus determined is preferably 0.6 or more, more preferably 1.8 or more, further preferably 2.1 or more, 2.2 It is still more preferable that it is above. Further, the IOB value of the cationic polymer is preferably 4.6 or less, more preferably 3.6 or less, and even more preferably 3.0 or less. Specifically, the IOB value of the cationic polymer is preferably 0.6 or more and 4.6 or less, more preferably 1.8 or more and 3.6 or less, and 2.1 or more and 3.6 or less. More preferably, it is 2.2 or more and 3.0 or less. The IOB value of sialic acid is 4.25 for sialic acid alone and 3.89 for sialic acid conjugate. The sialic acid conjugate is a glycolipid in which a sugar chain in a glycolipid and sialic acid are bound, and the sialic acid conjugate has a higher organic value ratio and a lower IOB value than sialic acid alone.

  Where the IOB value of the cationic polymer is as described above, the organic value itself is preferably 40 or more, more preferably 100 or more, and even more preferably 130 or more. Further, it is preferably 310 or less, more preferably 250 or less, still more preferably 240 or less, and even more preferably 190 or less. For example, the organic value is preferably 40 or more and 310 or less, more preferably 40 or more and 250 or less, still more preferably 100 or more and 240 or less, and still more preferably 130 or more and 190 or less. By setting the organic value of the cationic polymer within this range, the cationic polymer is more successfully adsorbed to erythrocytes.

  On the other hand, the inorganic value of the cationic polymer is preferably 70 or more, more preferably 90 or more, still more preferably 100 or more, still more preferably 120 or more, and 250 or more. It is particularly preferred that Further, it is preferably 790 or less, more preferably 750 or less, still more preferably 700 or less, still more preferably 680 or less, and particularly preferably 490 or less. For example, the inorganic value is preferably from 70 to 790, more preferably from 90 to 750, even more preferably from 90 to 680, still more preferably from 120 to 680, It is especially preferable that it is 250 or more and 490 or less. By setting the inorganic value of the cationic polymer within this range, the cationic polymer can be more effectively adsorbed to erythrocytes.

From the viewpoint of further successfully adsorbing the cationic polymer to erythrocytes, it is preferable that x and y satisfy the following formula A when the organic value of the cationic polymer is x and the inorganic value is y.
y = ax (A)
In the formula, a is preferably 0.66 or more, more preferably 0.93 or more, and even more preferably 1.96 or more. Further, a is preferably 4.56 or less, more preferably 4.19 or less, and even more preferably 3.5 or less. For example, a is preferably a number from 0.66 to 4.56, more preferably from 0.93 to 4.19, and a number from 1.96 to 3.5. Is more preferable. In particular, when the organic value and the inorganic value of the cationic polymer satisfy the above formula A, provided that the organic value and the inorganic value of the cationic polymer are within the above-mentioned ranges, the cation The functional polymer is likely to interact with the sialic acid conjugate, and the cationic polymer is more easily adsorbed to erythrocytes.

  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 added, 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 a 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 in the above 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. Further, 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 the 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 — can be used in addition to or in place of the vinyl polymerizable monomer. As described above, the quaternary ammonium salt copolymer may 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.

  Further, 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-methylpropanesulfonic acid, methacrylic acid, acrylic acid, styrenesulfonic 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 preferably 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. Or it is preferable to adjust so that the streaming potential of a quaternary ammonium salt copolymer may become the value mentioned above. Or it is preferable to adjust so that IOB of a quaternary ammonium salt copolymer may become the value mentioned above. 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 the 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 “preferable hemagglutinating agent 8”, and the effect thereof is Japanese Patent Application No. 2015-239286 and Japanese Patent Application Laid-Open No. 2006-107100 which is a Japanese publication of the application. And Examples 1 to 45 described in International Publication No. 2016/093233 pamphlet of the international application based on the priority claim.

  In addition, as described above, the hemagglutinating agent 8 included in the napkin 1 is a composition containing a third component such as a solvent, a plasticizer, a fragrance, a skin care agent, etc. in addition to the cationic polymer (haemagglutinating agent composition). It may be given in the form of a thing). In addition, components other than the cationic polymer that can be included in the hemagglutinating agent 8 can be used singly or in combination. 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, or 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 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. For example, the proportion of the cationic polymer is preferably 1% by mass to 50% by mass, more preferably 3% by mass to 30% by mass, and even more preferably 5% by mass to 10% by mass. preferable. 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 described above, in the napkin 1, as shown in FIGS. 4 and 5, the hemagglutinating agent 8 is disposed on the absorbent body 4 made of an absorbent sheet. The amount of hemagglutinating agent 8 contained in the absorbent sheet constituting the absorbent body 4 is preferably 0.1 g / m ² or more, more preferably 0.5 g / m ² or more. More preferably, it is 5 g / m ² or more. Further, it is preferably 25 g / m ² or less, more preferably 15 g / m ² or less, and even more preferably 10 g / m ² or less. For example, the amount of blood coagulant 8, is preferably 0.1 g / m ² or more 25 g / m ² or less, further preferably 0.5 g / m ² or more 15 g / m ² or less, 1.5 g / it is more preferred m ² or more and 10 g / m ² or less. By applying the hemagglutinating agent 8 in an amount within this range, the excreted menstrual red blood cells can be effectively aggregated. In addition, when the hemagglutinating agent 8 is applied to two or more parts, for example, when applied to both the main body absorbent sheet 401 and the central absorbent sheet 402 described later, the amount is It is the sum total of the hemagglutinating agent 8 applied to the site. It is particularly preferable that the hemagglutinating agent 8 is a cationic polymer and the amount of the cationic polymer contained in the absorbent sheet is in the above range.

  In the napkin 1, the absorbent body 4 has a multilayer structure formed of an absorbent sheet as shown in FIGS. Here, the formed multilayer structure may be formed by overlapping a plurality of absorbent sheets, or may be formed by folding a single absorbent sheet. However, it may be formed by combining these. In the napkin 1, the absorbent sheet forming the absorbent body 4 covers the central absorbent sheet 402 formed on the excretory part facing part B that is disposed to face the excretion part of the wearer when worn, and the central absorbent sheet 402. A main body absorbent sheet 401. That is, the absorbent body 4 of the napkin 1 is formed with a multilayer structure including the main body absorbent sheet 401 and the central absorbent sheet 402, and the middle and high portions 403 are formed in the excretory part facing part B. The multilayer structure of the absorbent body 4 of the napkin 1 has a structure in which a central absorbent sheet 402 is included in the folded structure of one main body absorbent sheet 401, and the central absorbent sheet 402 is formed in the middle and high portions 403. It is arranged.

  Preferably, in the napkin 1, as shown in FIG. 3 and FIG. 4, the main body absorbent sheet 401 is composed of one sheet having a length (width) in the lateral direction Y longer than that of the napkin 1, and the main body absorbent sheet 401 Of the absorbent sheet 401 is folded back to the back sheet 3 side to form a two-layer structure, and both side edges along the vertical direction X are overlapped at the center in the horizontal direction Y, The outer shape is formed. Thus, the main body absorbent sheet 401 which forms a two-layer structure has the surface side absorbent sheet 401a by the side of the surface sheet 2, and the back surface side absorbent sheet 401b by the side of the back sheet 3. The central absorbent sheet 402 is composed of a single sheet having a rectangular shape in plan view, and has a three-layer structure in which the central absorbent sheet 402 is folded in three in the lateral direction Y. When the central absorbent sheet 402 has a three-layer structure, in the two fold lines crossing the central absorbent sheet 402 in the longitudinal direction X, the second fold line counted from the free end in the lateral direction Y is used. Bend to the back sheet 3 side, and then bend to the top sheet 2 side at the first fold line counted from the free end in the lateral direction Y so that the free end in the lateral direction Y is arranged inside the three-layer structure Fold it in a spiral. Thus, the central absorbent sheet 402 that forms a three-layer structure folded in a spiral shape includes an upper absorbent sheet 402a on the front surface side absorbent sheet 401a side and a lower absorbent sheet on the back surface side absorbent sheet 401b side. 402b and an intermediate absorbent sheet 402c between the sheets 402a and 402b. The middle-high portion 403 is formed by sandwiching a sheet having a three-layer structure including an upper absorbent sheet 402a, an intermediate absorbent sheet 402c, and a lower absorbent sheet 402b between the front side absorbent sheet 401a and the rear side absorbent sheet 401b. Has been. The middle-high part 403 is formed only in the excretion part facing part B, and is not formed in the front part A and the rear part C. As shown in FIG. 4, the number of laminated absorbent sheets constituting the absorber 4 around the middle-high portion 403 is two, whereas the number of laminated absorbent sheets constituting the absorber 4 in the middle-high portion 403. However, the number of laminated sheets is large and the thickness is large. For this reason, the middle-high part 403 is a raised part that protrudes from the excretory part facing part B to the topsheet 2 side (skin facing side of the napkin 1).

  The thickness per absorbent sheet is preferably 0.1 mm or more, particularly 0.3 mm or more, and preferably 2 mm or less, particularly 1.5 mm or less. More specifically, it is 0.1 mm or more and 2 mm or less, particularly 0.3 mm or more and 1.5 mm or less to obtain an absorbent article having sufficient liquid diffusibility and liquid retention and having a good wearing feeling. It is preferable from the point.

  The absorber 4 has a thickness at the middle-high portion 403 of preferably 0.7 mm or more, more preferably 1 mm or more, preferably 5 mm or less, more preferably 4 mm or less, more specifically preferably It is 0.7 mm or more and 5 mm or less, More preferably, it is 1 mm or more and 4 mm or less. By setting the thickness of the mid-high portion 403 in such a range, it becomes easy to achieve both a good wearing feeling and high absorption performance in the excretory portion facing portion B where the mid-high portion 403 is formed. Moreover, when the absorbent article is provided with a wing part like the napkin 1 of this embodiment, it becomes easy to suppress the twist of the absorber in an excretion part opposing part at the time of mounting | wearing. The thickness of the absorber other than the middle-high portion 403 is preferably 0.3 mm or more, more preferably 0.5 mm or more, and preferably 3 mm or less, more preferably 2.5 mm or less, More specifically, it is preferably 0.3 mm or more and 3 mm or less, more preferably 0.5 mm or more and 2.5 mm or less. This range is preferable from the viewpoint of enhancing the high absorption performance and the ability to follow the wearer's movement. In addition, the thickness of an absorber and an absorptive sheet is measured by the following method.

<Measurement method of thickness of absorbent sheet and absorber>
The absorbent sheet or absorbent body, which is the measurement object, is placed in a horizontal place so as not to be wrinkled or bent, and the thickness under a load of 5 cN / cm ² is measured. A thickness meter PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) Was used for measuring the thickness in the present invention. At this time, a circular plate or a square plate (acrylic plate having a thickness of about 5 mm) in plan view is disposed between the tip of the thickness meter and the measurement portion of the measurement object, and the load is 5 cN / cm ² . Adjust the size of the plate so that

  In the napkin 1, the hemagglutinating agent 8 is present at least in the fiber-rich region FT in the portion used by arranging the fiber-rich region FT on the skin facing surface side. Here, when the absorbent body 4 has a multilayer structure formed of an absorbent sheet like the napkin 1, even if the hemagglutinating agent 8 is not disposed on all the absorbent sheets forming the multilayer structure. Good. In the napkin 1, as shown in FIG. 4, the hemagglutinating agent 8 is disposed on a main body absorbent sheet 401 that forms a two-layer structure including a front-side absorbent sheet 401a and a back-side absorbent sheet 401b. As described above, since it has a two-layer structure in which both side portions along the longitudinal direction X of the main body absorbent sheet 401 are folded, the surface-side absorbent sheet 401a has the fiber-rich region FT disposed on the skin facing surface side. The back side absorbent sheet 401b is used with the fiber rich region FT disposed on the non-skin facing surface side. Therefore, in the middle-high portion 403, the front side absorbent sheet 401a, the upper side absorbent sheet 402a, and the intermediate absorbent sheet 402c are all in the order of the fiber rich region FT and the polymer rich region PT as viewed from the skin contact surface side. Each of the lower absorbent sheet 402b and the back absorbent sheet 401b has a polymer rich region PT and a fiber rich region FT arranged in this order as viewed from the skin contact surface. And in the surface side absorbent sheet 401a used by arranging the fiber rich region FT on the skin facing surface side, the hemagglutinating agent 8 exists in the polymer rich region PT and the fiber rich region FT, and the polymer rich region There are more in the fiber rich region FT than in PT. Here, “existingly” means comparing the mass of the hemagglutinating agent 8 present per area of each region FT, PT, that is, the basis weight of the hemagglutinating agent 8 in each region FT, PT. In this case, it means that the basis weight of the hemagglutinating agent 8 in one region is relatively large. In the napkin 1, the hemagglutinating agent 8 is not disposed on the central absorbent sheet 402 that forms a three-layer structure including the upper absorbent sheet 402a, the intermediate absorbent sheet 402c, and the lower absorbent sheet 402b.

  Further, in the back side absorbent sheet 401b in which the fiber rich region FT is arranged and used on the non-skin facing surface side, in other words, in the back side absorbent sheet 401b in which the polymer rich region PT is arranged and used on the skin facing surface side, blood cell aggregation The agent 8 is present in the polymer rich region PT and the fiber rich region FT, and more in the fiber rich region FT than in the polymer rich region PT.

  In the napkin 1, as shown in FIG. 1, the compressed groove 9 is formed in the outer side portion 401 </ b> S outside the side edge 402 f along the longitudinal direction X of the central absorbent sheet 402 in the main body absorbent sheet 401. Yes. Preferably, each vertical pressing groove 92 of the pressing groove 9 is arranged on the outer side portion 401S of the main body absorbent sheet 401, and in the vertical direction X while forming a convex curvilinear shape inward in the horizontal direction Y. It extends. Moreover, in the napkin 1, each horizontal pressing groove 91 which the pressing groove 9 has is distribute | arranged to the outer edge part of an outer side rather than the both ends of the longitudinal direction X of the center absorbent sheet 402 in the main body absorbent sheet 401, It extends in the lateral direction Y while forming a convex curve shape outward in the direction X.

  In the napkin 1, as described above, the hemagglutinating agent 8 is disposed on the main absorbent sheet 401 having a two-layer structure that constitutes the absorber 4. As shown in FIG.1 and FIG.2, it arrange | positions not only in the excretion part opposing part B but in the whole region ranging from the front part A to the back part C.

Whether or not the hemagglutinating agent 8 is disposed on the constituent material of the absorbent article can be easily analyzed by those skilled in the art, such as a method of extracting the constituent material by exposure to a solvent and analyzing the components, For example, it can also be determined as follows.
Using an energy dispersive X-ray analyzer (EDX) attached to a scanning electron microscope (SEM), the superabsorbent polymer 41 included in the absorber 4, the constituent fibers included in the absorber 4, and the hemagglutinating agent 8 are preliminarily used. Each elemental analysis is performed. Next, a sample piece to be judged as to whether or not the hemagglutinating agent 8 is arranged is attached to an aluminum sample table using a double-sided carbon tape, and after performing platinum / vanadium coating as necessary, SEM observation is performed. The presence or absence of elements in the hemagglutinating agent 8 is confirmed using EDX (element analysis device) while enlarging. The measurement is performed at an acceleration voltage of 15 kV to 40 kV.

Whether hemagglutinating agent 8 is present in the fiber rich region FT more than the polymer rich region PT is determined semi-quantitatively as follows.
A sample piece made of an absorbent sheet having a polymer-rich region PT and a fiber-rich region FT and containing the hemagglutinating agent 8 is attached to an aluminum sample table using a double-sided carbon tape, and platinum as necessary. / After performing vanadium coating, using EDX (element analysis device) while enlarging with SEM observation, mapping of element of superabsorbent polymer 41, mapping of element of constituent fiber, mapping of element of hemagglutinating agent 8 Do. The measurement is performed at an acceleration voltage of 15 kV to 40 kV. Then, by comparing the mapping of the obtained element distribution, when the mapping of the element of the hemagglutinating agent 8 is more similar to the mapping of the element of the constituent fiber than the mapping of the element of the superabsorbent polymer 41, the blood cell It is determined that the flocculant 8 is present more in the fiber rich region FT than in the polymer rich region PT.

  Further, the absorbent sheet in which the hemagglutinating agent 8 is present in the fiber rich region FT more than the polymer rich region PT is selectively used with respect to the fiber rich region FT in the manufacturing process of the absorbent sheet. It can be created if it contains. For example, in the case where the absorbent sheet has a structure in which a fiber rich layer that is a fiber rich region FT and a polymer rich layer that is a polymer rich region PT are overlapped on each of the upper and lower sides, each layer is created separately, The hemagglutinating agent 8 may be included in the fiber-rich layer before overlapping with the polymer-rich layer.

For example, the case of the absorbent sheet described in Japanese Patent No. 2963647 will be described. Superabsorbent by spraying superabsorbent polymer on wet fiber web made by wet papermaking of constituent slurry and heat-meltable adhesive fiber or paper strength reinforcing agent constituting absorbent body 4 A fiber assembly comprising a superabsorbent polymer-rich layer (corresponding to a polymer-rich region PT) in which a polymer has entered between fibers, and the constituent fibers constituting the absorbent body 4 and a hot-melt adhesive fiber or a paper strength reinforcing agent. The absorbent body is manufactured by superimposing and integrating the bodies, whereby the superposed fiber aggregate becomes a fiber rich layer (corresponding to the fiber rich region FT). The hemagglutinating agent 8 is preliminarily contained in the overlapping fiber assembly, or the absorbent sheet is manufactured while spraying or applying the hemagglutinating agent 8 to the overlapping fiber assembly in the manufacturing process of the absorbing sheet. As a result, more hemagglutinating agent 8 can be present in the fiber-rich layer than in the absorbent polymer-rich layer.
The layer to which the superabsorbent polymer is dispersed is not limited to a wet web, and may be a piled pulp, papermaking, paper produced by drying, or a nonwoven fabric. From the viewpoint that the superabsorbent polymer can easily enter between fibers, bulky paper such as creped or air-through non-woven fabric is preferable, the fibers of the superabsorbent polymer and the superabsorbent polymer rich layer, and the superabsorbent A hot melt, a water-soluble adhesive or the like may be used as an adhesion means between the polymer rich layer and the fiber rich layer. Further, the fiber-rich layer may be formed by stacking or spraying the constituent fibers constituting the absorbent body 4 on the superabsorbent polymer-rich layer. As a method for applying the hemagglutinating agent 8, the hemagglutinating agent 8 may be sprayed or applied to the fiber rich layer side after the production of the absorbent sheet.

  In the sanitary absorbent article of the present invention, the absorbent body has a first slit extending outward in the vertical direction or the horizontal direction from a position overlapping the groove when the absorbent article is viewed in plan. In the napkin 1 of this embodiment, the absorber 4 has the slit 44 containing the said 1st slit, as shown in FIGS. Preferably, in the napkin 1, a slit 44 extending in parallel to the longitudinal direction X is provided in the excretory part facing part B of the absorbent body 4 as shown in FIGS. The slit 44 makes it easy for menstrual blood that has reached the absorber 4 to be diffused in the longitudinal direction X and also to penetrate in the thickness direction of the absorber 4. In the napkin 1, as shown in FIG. 2, the slits 44 extending in the vertical direction X have slit regions 44 </ b> S formed in a state of being dispersed in both the vertical direction X and the horizontal direction Y. As shown in FIG. 2, the slit region 44 </ b> S in which the plurality of slits 44 are arranged extends not only to the excretory part facing part B but also to a part of the front part A and a part of the rear part C. That is, the slit 44 exists at least in the excretory part facing part B, and an area including the slit 44 located in the excretion part facing part B is referred to as a slit area 44S.

  In the napkin 1, the slit 44 is formed in the absorbent body 4 in which the hemagglutinating agent 8 is arranged, that is, the absorbent sheet in which the hemagglutinating agent 8 is arranged. From the viewpoint of menstrual blood diffusibility, the slit 44 only needs to penetrate at least the absorbent sheet on the most skin-facing surface side including the hemagglutinating agent 8, but the napkin 1 is formed of an absorbent sheet. The multilayer absorbent body 4 is penetrated through the entire thickness direction. In the napkin 1, the most skin-facing surface-side absorbent sheet containing the hemagglutinating agent 8 is the surface-side absorbent sheet 401a. Preferably, in the napkin 1, in the excretion part facing part B, the slit 44 includes five laminated sheets constituting the middle-high part 403, that is, the surface side absorbent sheet 401a, the upper absorbent sheet 402a, and the intermediate absorbent sheet. It penetrates all the sheets 402c, the lower absorbent sheet 402b, and the rear absorbent sheet 401b. Moreover, in the napkin 1, the slit 44 penetrates the front surface side absorbent sheet 401a and the back surface side absorbent sheet 401b in a part of the front part A and a part of the rear part C.

  Further, in the napkin 1, as shown in FIGS. 1 and 6, when viewed in plan, the slit 44 is disposed so as to extend at least outward from a position overlapping the pressing groove 9, and It has the 2nd slit 442 which does not extend to the outward of the pressing groove 9. FIG. Here, the 1st slit 441 has overlapped with the vertical pressing groove 92 which comprises the pressing groove 9, and is extended to the outward of the vertical direction X or the horizontal direction Y from the position which overlaps with the vertical pressing groove 92. Means. The second slit 442 means a slit 44 other than the first slit 441 in the slit 44. In other words, the second slit 442 is different from the first slit 441 in that the slit 44 does not overlap with the pressing groove 9 or the pressing groove 9 does not overlap the pressing groove 9 in the vertical direction X or the horizontal direction Y. This means a slit 44 extending in the direction.

  Moreover, in the napkin 1, as shown in FIG.1 and FIG.6, planar view WHEREIN: Some slits in the some 1st slit 441 cross | intersect the pressing groove 9, and the position which overlaps with the pressing groove 9 It is arranged to extend outward and inward from each other. In other words, in the napkin 1, the first slit 441 intersects the vertical pressing groove 92 as well as a form extending outward from a position overlapping the vertical pressing groove 92 constituting the pressing groove 9. From the position where it overlaps with the groove 92, it extends outward and includes a form extending inward. Thus, in the napkin 1, the first slit 441 extends only outward from the position overlapping the vertical pressing groove 92, and extends outward from the position overlapping the vertical pressing groove 92. Also includes an extended form.

In the napkin 1, if the arrangement of the slits 44 in the slit region 44S is an arrangement in which each slit 44 is dispersed in both the vertical direction X and the horizontal direction Y and has the first slit 441 that overlaps the compressed groove 9, There is no particular limitation. However, it is preferable that four or more slits are dispersedly arranged in the outer side portion 401S of the main body absorbent sheet 401, and that four or more slits are dispersedly arranged in the central slit region 44S1. . The central slit region 44S1 is a region overlapping with the central absorbent sheet 402 in the slit region 44S.
In the central slit region 44S1, it is preferable that three or more slit rows are formed in the longitudinal direction X, more preferably four rows or more, and still more preferably five rows or more. Further, the number of slits 44 spaced apart in the lateral direction Y included in each slit row is preferably 2 or more, and more preferably 3 or more.
In the longitudinal direction X of the slit region 44S, in addition to the slit rows included in the central slit region 44S1, it is preferable to have one row or two or more slit rows before and after the longitudinal direction X of the central slit region 44S1.

  Further, in the napkin 1, the pair of left and right vertical squeezing grooves 92, 92 are curved from the front part A side and the rear part C side toward the excretory part facing part B so as to minimize the distance therebetween. Is formed. And the vertical pressing groove 92 is formed so that the distance between a pair of vertical pressing grooves 92 and 92 may become the maximum in the front part A side and back part C side from the excretion part opposing part B. In the napkin 1, the first slit 441 is vertically compressed at a portion where the distance between the vertical pressing grooves 92 and 92 decreases from the front part A side and the rear part C side toward the excretory part facing part B. It overlaps with the groove 92 and extends from the overlapped portion so as to be located outward in the lateral direction Y of the vertical groove. At this time, the portion extending outward from the position overlapping the vertical pressing groove 92 is located on the excretory part facing part B side with respect to the front part A and the rear part C.

  In the napkin 1, the first slit 441 is formed such that the opening width WU441 on the topsheet 2 side is larger than the opening width WD441 on the backsheet 3 side, as shown in FIG. Further, in the napkin 1, the second slit 442 is formed such that the opening width WU442 on the top sheet 2 side is larger than the opening width WD442 on the back sheet 3 side, as shown in FIG. The opening widths WU441 and WU442 on the surface sheet 2 side in the first and second slits 441 and 442 are preferably 0.05 mm or more, more preferably 0.7 mm or more, and preferably 1.2 mm or less, more preferably. Is 1.0 mm or less, more specifically, preferably 0.05 mm or more and 1.2 mm or less, more preferably 0.07 mm or more and 1.0 mm or less. Further, the opening widths WD441 and WD442 on the back sheet 3 side in the first and second slits 441 and 442 are preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 1.5 mm or less, More preferably, it is 1.2 mm or less, More specifically, Preferably it is 0.1 mm or more and 1.5 mm or less, More preferably, it is 0.2 mm or more and 1.2 mm or less. The opening width of the slit 44 of the absorber 4 described above is measured by the following method.

<Measuring method of opening width of slit 44>
The opening width of the slit 44 is obtained by removing the absorber 4 from the napkin 1, placing the removed absorber 4 horizontally, and adjusting the measurement magnification with a Keyence digital microscope VHX-900 to increase the opening width. taking measurement.

The length (length in the longitudinal direction) L44 (see FIG. 2) when the slit 44 in the slit region 44S is viewed in plan is preferably 10 mm or more, more preferably 15 mm or more, and preferably 35 mm or less, more preferably. Is 25 mm or less, preferably 10 mm or more and 35 mm or less, more preferably 15 mm or more and 25 mm or less.
The interval (width direction interval) D44 between the slits 44 in the same slit row in the slit region 44S is preferably 3 mm or more, more preferably 7 mm or more, preferably 20 mm or less, more preferably 15 mm or less, and preferably Is from 3 mm to 20 mm, more preferably from 7 mm to 15 mm.

  When the first slit 441 is viewed in plan, the length L1 of the portion LG441 extending outward from the position overlapping the vertical pressing groove 92 is a portion LN441 extending inward from the position overlapping the vertical pressing groove 92. It is preferable that it is longer than length L2. Specifically, the length L1 (see FIG. 6) of the portion LG441 of the first slit 441 is preferably 0 mm or more, more preferably 3 mm or more, preferably 35 mm or less, more preferably 20 mm or less, 0 mm or more and 35 mm or less are preferable, and 3 mm or more and 20 mm or less are more preferable. Further, the length L2 (see FIG. 6) of the portion LN441 of the first slit 441 is preferably 0 mm or more, more preferably 3 mm or more, preferably 35 mm or less, more preferably 20 mm or less, and 0 mm or more and 35 mm. The following is preferable, and 3 mm or more and 20 mm are more preferable.

  When the first slit 441 is viewed in plan, the angle β (see FIG. 6) formed by the first slit 441 and the vertical pressing groove 92 is preferably 2 degrees or more, more preferably 5 degrees or more, and 90 degrees or less. It is preferably 80 ° or less, more preferably 2 ° or more and 90 ° or less, and further preferably 5 ° or more and 80 ° or less.

  The formation material of each structural member of the napkin 1 of this embodiment mentioned above is demonstrated.

  As the surface sheet 2, a single layer or multilayered nonwoven fabric, a perforated film, or the like can be used, but a surface sheet made of a nonwoven fabric treated with a hydrophilizing agent can be preferably used. As the hydrophilizing agent, various materials conventionally used for absorbent articles such as sanitary napkins can be used without particular limitation. In the napkin 1, a sheet having a concavo-convex structure shown in FIG. 7 is used. In FIG. 7, the main part of the skin facing surface of the topsheet 2 in the napkin 1 is shown enlarged. On the skin facing surface 2a of the top sheet 2 (skin facing surface of the napkin 1), depressions 20 extending in the direction intersecting the vertical direction X and the horizontal direction Y (that is, the diagonal direction) are formed in a diagonal lattice shape. The top sheet 2 is partitioned into a large number of regions by the recess 20, and a large number of partitioned regions 22 are formed. In the embodiment shown in FIG. 7, the depression 20 is formed over the entire surface sheet 2. It may replace with this and you may form the hollow part 20 in the excretion part opposing part B at least. Note that the X direction in FIG. 7 is the same direction as the direction (CD) orthogonal to the sheet flow direction at the time of manufacturing the top sheet, and is also the same as the longitudinal direction X (see FIG. 1) of the napkin 1. Moreover, the Y direction in FIG. 7 is the same direction as the flow direction (MD) of the sheet at the time of manufacturing the top sheet, and is also the same direction as the lateral direction Y (see FIG. 1) of the napkin 1.

  The surface sheet 2 will be further described. The surface sheet 2 is made of a fiber sheet such as a non-woven fabric having a single layer structure or a multilayer structure, for example, and the entire area of the skin facing surface 2a is formed in an oblique lattice shape as shown in FIG. It has a concave-convex shape having a large number of concave portions 20 and a plurality of convex portions 21 surrounded by the concave portions 20. On the other hand, the non-skin facing surface 2b of the topsheet 2 does not substantially have an uneven shape and is substantially flat.

  The recess 20 is formed by pressing or bonding the constituent fibers of the surface sheet 2 made 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 surface sheet 2, the density of the recessed portions 20 is higher than the density of the convex portions 21. Due to this, when the external force is applied to the top sheet 2, the recessed portion 20 easily acts as a flexible shaft for deformation. The recess 20 in the topsheet 2 according to the present embodiment is formed by subjecting a fiber web formed by a card method to hot embossing. In the hollow part 20, the heat-fusible fiber which is the constituent fiber of the surface sheet 2 or the nonwoven fabric which comprises it is integrated by heat fusion. The heat-fusible fiber in the hollow part 20 does not maintain the form of the fiber because the heat-fusion component is melted.

  In the surface sheet 2, the recess 20 is formed only in the surface sheet 2, and is not formed in the absorbent body 4 disposed below the surface sheet 2 and adjacent to the surface sheet 2. Therefore, the topsheet 2 and the absorber 4 are not joined via the recess 20.

  It is preferable that the hollow part 20 is linear. Here, “linear” means that the shape of the recess 20 is not limited to a straight line as shown in FIG. 7 in a plan view, but includes a curved line, and each line may be a continuous line, or may be a rectangle, square, rhombus in a plan view. In addition, a large number of concave portions (embossed portions) such as a circle and a cross may be connected substantially without being spaced apart to form a continuous line as a whole. “Substantially without an interval” means that the interval between adjacent recesses is within 5 mm.

  As shown in FIG. 7, the recess 20 is formed in an oblique lattice shape. More specifically, the topsheet 2 is formed as the depressions 20 in parallel with each other and a plurality of first linear depressions 20a formed at a predetermined interval and in parallel with each other at a predetermined interval. In addition, a plurality of second linear depressions 20b are formed, and the first linear depressions 20a and the second linear depressions 20b intersect each other at a predetermined angle. Each of the first linear depression 20a and the second linear depression 20b extends linearly in a direction that intersects the vertical direction X and the horizontal direction Y (that is, an oblique direction). The width of the first linear depression 20a and the width of the second linear depression 20b may be the same or different. The interval between the first linear depressions 20a and the interval between the second linear depressions 20b may be the same or different.

Each partition region 22 is a region surrounded by a linear depression 20 and has a rhombus shape in plan view. Area of each divided area 22 is preferably, for example, 0.25 cm ² or more 2 cm ² or less. The partition region 22 may have a rhombus shape that is longer in the horizontal direction Y than in the vertical direction X in plan view. Or conversely, it may be a rhombus shape that is longer in the vertical direction X than in the horizontal direction Y. When the partition region 22 has a shape that is long in the lateral direction Y of the napkin 1, the topsheet 2 on which a large number of the recessed portions 20 are formed retains high rigidity in the lateral direction Y. This effectively prevents twisting and wrinkling in the state in which the napkin 1 is attached. When the napkin 1 is worn, wrinkles or wrinkles are mainly caused by the napkin 1 sandwiched between the thighs of the wearer being pressed from the lateral direction Y by the thighs. However, if the rigidity is maintained in the lateral direction Y, the shape of the napkin 1 is easily maintained even when pressed from the lateral direction Y, and twisting and wrinkles are less likely to occur.

  Each partition region 22 is formed with a convex portion 21 that protrudes relatively to the hollow portion 20 surrounding the partition region 22, and each partition region 22 has a top portion 21 a on the skin facing surface 2 a side. It has a shape. The top portion 21 a of the convex portion 21 is located at the center of the partition region 22. The inside of the convex portion 21 is filled with the constituent fibers of the topsheet 2. In the present invention, a hollow portion other than a linear shape is not excluded, but from the viewpoint of forming a good convex portion 21, a linear hollow portion is preferable.

  Thus, the contact area with the wearer's skin of the napkin 1 reduces because the hollow part 20 and the convex part 21 are alternately arrange | positioned in the vertical direction X and the horizontal direction Y of the surface sheet 2, respectively. This effectively prevents stuffiness and rash. Moreover, the convex part 21 (partition area | region 22) is surrounded by the hollow part 20, and since it has the closed shape in planar view, compared with the case where the convex part 21 is not surrounded by the hollow part 20, Since the constituent fibers in the convex portion 21 are easily stretched in the thickness direction of the top sheet 2, the thickness of the convex portion 21 is increased, thereby 1) the liquid can permeate quickly and the liquid residue is small, and the top sheet 2. 2) Since the convex portions 21 are formed in a regular pattern, the visual impression is improved, and so on.

  In addition, it replaces with the thing of the structure mentioned above as a surface sheet of a concavo-convex structure, the surface sheet of a concavo-convex structure which has a hollow convex part, and the collar part from which a convex part and a recessed part each extend in the vertical direction or the horizontal direction of the napkin 1 And a surface sheet that is a groove. However, from the viewpoint of menstrual blood absorption, the above-described solid surface uneven sheet is preferable.

  In addition, as the back surface sheet 3, various things conventionally used for absorbent articles, such as a sanitary napkin, can be used without a restriction | limiting especially, A moisture-permeable resin film and a moisture-impermeable resin film can be used. .

In the napkin 1, it is preferable that an adhesive is applied and fixed between the top sheet 2 and the absorber 4 and between the absorber 4 and the back sheet 3. The adhesive can be applied using a known means such as a slot coat gun, a spiral spray gun, a spray gun, or a dot gun. In the napkin 1, the adhesive can be applied in a spiral shape using a spiral spray gun. preferable. As the adhesive to be applied, for example, a hot melt adhesive is preferably used. The application amount of the hot melt adhesive is preferably 1.5 g / m ² or more and 10 g / m ² or less.

  Further, as in the case of the napkin 1, in order to form the slit 44 in the absorbent body 4, the laminate of the absorbent sheet may be partially cut by a known cutting means. For example, the circumferential surface of the roll A cutting device provided with a cutter roll in which a number of cutting blades extending in the direction are dispersed in the circumferential direction and the axial length direction of the roll and an anvil roll that receives the blade of the cutter roll can be used.

  The linear squeezing grooves 9 (the horizontal squeezing grooves 91 and the vertical squeezing grooves 92) can be formed in accordance with a conventional method by pressing with or without heat (so-called embossing), or embossing such as ultrasonic embossing. it can. Moreover, as a pressure-bonding means of the pressing groove 9, thermocompression bonding is particularly preferable among the pressure bonding. Here, “thermocompression bonding” is different from heat fusion in which the constituent fibers constituting the surface sheet 2 are fixed to form a nonwoven fabric shape, and embossing or the like is performed while the surface sheet 2 and the absorbent body 4 are heated. Means that the surface sheet 2 is pressed and compressed.

The operational effect and estimation mechanism of the napkin 1 described above will be described.
As shown in FIG.1 and FIG.6, the napkin 1 is equipped with the pressing groove 9 by which the surface sheet 2 and the absorber 4 are integrally compressed. Therefore, it is possible to prevent side leakage that occurs when the menstrual blood of the wearer flows on the top sheet 2 during use of the napkin 1. Further, as shown in FIG. 4, the absorbent body 4 of the napkin 1 contains a hemagglutinating agent 8, and a first slit 441 extending outward from a position overlapping the pressing groove 9 is formed. Therefore, during use of the napkin 1, menstrual blood is absorbed into the absorber 4 through the first slit 441, and menstrual blood is separated into red blood cells and plasma by the hemagglutinating agent 8 contained in the absorber 4. can do. In the compressed groove 9, the agglomerates are easily captured at the portion of the compressed groove 9 having a high fiber density, and are less likely to move outward than the compressed groove 9. Further, as shown in FIG. 6, the first slit 441 is arranged so as to extend outward from a position overlapping the pressing groove 9, so that the plasma that is a liquid component is more outward than the pressing groove 9. It is possible to effectively move a portion located outside the compressed groove 9 in the absorbent body 4, and the wide area of the absorbent body 4 can be utilized. For this reason, it can be expected that menstrual blood is prevented from leaking.

  Moreover, in the napkin 1, as shown in FIG. 6, the 1st slit 441 extended outward from the position which overlaps with the pressing groove 9 cross | intersects the vertical pressing groove 92, and from the position which overlaps with the vertical pressing groove 92. In addition, it includes a form that extends outward and also extends inward. Here, the portion of the absorbent body 4 where the slits 44 are formed has a higher fiber density than the portion of the absorbent body 4 where the slits 44 are not formed. Therefore, plasma, which is a liquid component separated from menstrual blood, easily collects in the portion where the slits 44 are formed, and the collected plasma is discharged from the inside of the compressed groove 9 through the intersecting first slits 441. It is easy to move further. Therefore, the part located outside the pressing groove 9 in the absorbent body 4 can be used more effectively, and the side leakage of menstrual blood can be further suppressed.

  Moreover, in the napkin 1, as shown in FIG. 1, the vertical squeezing groove 92 which comprises the squeezing groove | channel 9 is extended in the vertical direction X, curving to each side part along the vertical direction X in the excretion part opposing part B. Yes. Therefore, the 1st slit 441 distribute | arranged so that it may extend outside from the position which overlaps with the pressing groove 9 is easy to be formed, and the part located outside the pressing groove 9 in the absorber 4 is utilized more effectively. It is possible to further suppress the side leakage of menstrual blood.

  Moreover, in the napkin 1, as shown in FIG. 1, the pressing groove 9 is formed in the outer side part 401S outside the side edge 402f along the longitudinal direction X of the central absorbent sheet 402 in the main body absorbent sheet 401. Has been. Thus, since the pressing groove 9 is arranged on the outer side portion 401S having a small number of laminated sheets, the surface side absorbent sheet 401a and the back side absorbent sheet 401b constituting the main body absorbent sheet 401 are pressure-bonded. It is difficult, and plasma, which is a liquid component, easily diffuses between the sheets, and the portion located outside the pressing groove 9 in the absorber 4 can be used more effectively. Further, in the napkin 1, the blood cell aggregating agent 8 is disposed on the main body absorbent sheet 401, and the vertical squeezing groove 92 is disposed on the outer side portion 401S of the main body absorbent sheet 401. 9, the plasma is more easily moved outward than the pressing groove 9, and the portion of the absorbent body 4 positioned outside the pressing groove 9 can be used more effectively. Lateral leakage of blood can be further suppressed.

  Moreover, in the napkin 1, as shown in FIG.3 and FIG.4, the slit 44 has penetrated all the layers through the thickness direction of the absorber 4 of the multilayer structure formed with the absorbent sheet. Therefore, plasma as a liquid component is easily diffused between sheets having a multilayer structure, and the absorber 4 can be used more effectively, and menstrual blood and red blood cell aggregates are formed on the non-skin facing surface side of the absorber. Since it becomes easy to transfer and the redness on the outer edge side of the napkin becomes difficult to be visually recognized, the wearer can be more comfortable with leakage.

  In the napkin 1, as shown in FIG. 4, the first and second slits 441 and 442 are formed such that the opening widths WU441 and WU442 on the top sheet 2 side are larger than the opening widths WD441 and WD442 on the back sheet 3 side. Has been. Therefore, menstrual blood is more easily absorbed into the absorber 4 through the slit 44, and the absorber 4 can be used more effectively.

  Further, in the napkin 1, as shown in FIG. 5, the absorbent body 4 made of an absorbent sheet has a relatively high absorbency and a polymer rich region PT with a relatively high amount of the high absorbency polymer 41 in a cross-sectional view. And the hepatic flocculant 8 is present in at least the fiber-rich region FT in the portion used by arranging the fiber-rich region FT on the skin facing surface side. . Therefore, during use of the napkin 1, after menstrual blood is separated into red blood cells and plasma by the hemagglutinating agent 8 in the fiber-rich region FT on the skin-facing surface side, the plasma, which is a liquid component, is polymer rich in the lower layer. The superabsorbent polymer 41 in the region PT can be mainly absorbed, the absorption rate for absorbing blood is likely to be increased, and the liquid return can be further suppressed.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, the sanitary absorbent article of this invention is not restrict | limited to the napkin 1 of the said embodiment at all, and can be changed suitably.

  For example, in the napkin 1, the absorbent body 4 has a plurality of slits 44 for diffusing blood in the excretory part facing part B of the absorbent body 4, as shown in FIGS. Although extending in parallel with the direction X, if the first slit 441 is formed so as to extend outward from a position overlapping the pressing groove 9, it may not extend in parallel with the longitudinal direction X. . Specifically, in the napkin 1 illustrated in FIG. 8, the plurality of slits 44 are disposed symmetrically with respect to the center line CL extending in the longitudinal direction X that bisects the napkin 1. Further, the slit 44 arranged on the right side is inclined and extended so that an angle γ formed with the center line CL becomes an acute angle. Therefore, in the napkin 1 shown in FIG. 8, the first slit 441 is easily formed, and the portion located outside the compressed groove 9 in the absorbent body 4 can be used effectively, and liquid return can be performed. Can be suppressed.

  Further, in the napkin 1, as shown in FIGS. 1 and 6, when viewed in plan, the slit 44 is disposed so as to extend at least outward from a position overlapping the pressing groove 9, and Although it has the 2nd slit 442 which does not extend to the outward of the pressing groove 9, it is sufficient to have only the 1st slit 441.

Moreover, in the napkin 1, as shown in FIG. 4, the hemagglutinating agent 8 is arranged on the main body absorbent sheet 401 forming a two-layer structure composed of the front side absorbent sheet 401a and the back side absorbent sheet 401b. However, the central absorbent sheet 402 which does not have the hemagglutinating agent 8 disposed on the main body absorbent sheet 401 and forms a three-layer structure composed of an upper absorbent sheet 402a, an intermediate absorbent sheet 402c, and a lower absorbent sheet 402b. In addition, the hemagglutinating agent 8 may be disposed. Further, a hemagglutinating agent 8 is disposed on a main body absorbent sheet 401 that forms a two-layer structure including a front surface side absorbent sheet 401a and a back surface side absorbent sheet 401b, and further, an upper absorbent sheet 402a, an intermediate absorbent sheet The hemagglutinating agent 8 may also be disposed on the central absorbent sheet 402 that forms a three-layer structure including the absorbent sheet 402c and the lower absorbent sheet 402b.
Thus, when the absorber 4 has a multilayer structure formed of an absorbent sheet, the hemagglutinating agent 8 contained is the same in any of the absorbent sheets 401a, 401b, 402a, 402b, and 402c. The hemagglutinating agent 8 or a different hemagglutinating agent 8 may be used. Further, the hemagglutinating agent 8 may not be provided on the absorbent body 4 but may be provided on a member on the skin-facing surface side of the absorbent body 4. For example, the hemagglutinating agent 8 may be disposed between the topsheet and the topsheet and the absorbent body. It may be provided on the sheet material.

  Further, as shown in FIGS. 4 and 5, the absorbent sheet constituting the absorbent body 4 is formed of a two-layer region of a polymer rich region PT and a fiber rich region FT. The region FT may not be formed, and may be formed of three or more layers having the polymer rich region PT and the fiber rich region FT.

  3 and 4, the multilayer structure of the absorbent body 4 of the napkin 1 has a structure in which a central absorbent sheet 402 is included in the folded structure of one main body absorbent sheet 401. However, the main body absorbent sheet 401 may have a multilayer structure covering the central absorbent sheet 402. For example, a multi-layer structure in which the skin-facing surface of the central absorbent sheet 402 having a three-layer structure folded in three is covered with one main body absorbent sheet 401, or the skin of one main body absorbent sheet 401 may be used. A multilayer structure in which a central absorbent sheet 402 having a three-layer structure folded in three is disposed on the opposing surface may be used.

  Moreover, as shown in FIG.4 and FIG.5, the hemagglutinating agent 8 is distribute | arranged to the absorber 4 formed with the absorptive sheet, but is not formed with the absorptive sheet | seat type absorbent core And an absorbent body formed of a core wrap sheet that wraps the absorbent core. When the hemagglutinating agent 8 is disposed on an absorbent body formed of an absorbent core and a core wrap sheet, the absorbent core is formed of the superabsorbent polymer 41 and constituent fibers, and the absorbent core It is preferable that the hemagglutinating agent 8 is disposed on a core wrap sheet formed of tissue paper or the like that wraps the tissue.

  In the sanitary absorbent article of the present invention, a second sheet composed of a nonwoven fabric may be disposed between the top sheet 2 and the absorbent body 4. The width of the second sheet (the length in the horizontal direction Y) is preferably shorter than the width of the absorber 4 (the length in the horizontal direction Y), and the length in the vertical direction X is the vertical direction of the absorber 4. It is preferable that it is longer than the length of X and is arranged over the entire length of the napkin in the longitudinal direction X. The second sheet is a sheet that is also called a sub-layer sheet in the technical field, which is separate from the top sheet 2 and the absorber 4, and the top sheet 2 and / or the absorber 4 are provided in a stripe shape or a spiral shape. Partially bonded by an adhesive or the like. The second sheet is a sheet that plays a role of improving the permeability of the liquid from the top sheet 2 to the absorber 4 or reducing the return of the liquid absorbed by the absorber 4 to the top sheet 2. The sanitary absorbent article of the present invention includes an embodiment in which the second sheet includes a water-soluble hemagglutinating agent.

  Furthermore, regarding the compressed groove 9, instead of the form of the napkin of the present embodiment, the longitudinal groove extending in the longitudinal direction X while forming the convex curved shape in the lateral direction Y inward in the excretion part facing part B. The groove shape in the front portion A and the rear portion C may be a straight groove shape or a compressed groove shape that is a concave curve shape inward in the lateral direction Y.

  Moreover, the sanitary absorbent article for absorbing menstrual blood of the present invention may be a panty liner (clay sheet) or the like in addition to a sanitary napkin.

  The following sanitary absorbent articles are further disclosed with respect to the embodiment of the present invention described above.

<1>
A sanitary absorption comprising an absorbent body containing a superabsorbent polymer, and a top sheet and a back sheet sandwiching the absorbent body, and having a longitudinal direction corresponding to the wearer's longitudinal direction and a transverse direction perpendicular to the longitudinal direction It is a functional article, comprising a groove having a bottom on the back sheet side, in which the top sheet and the absorbent body are integrated on the skin facing surface, and a hemagglutinating agent on the skin facing surface or the absorbent body. The absorbent body has a first slit that extends outwardly in the longitudinal direction or the lateral direction from a position overlapping the groove in plan view of the sanitary absorbent article. A sanitary absorbent article.
<2>
The first slit is arranged so as to extend outward and inward in the longitudinal direction or the lateral direction from a position overlapping the groove in a plan view of the sanitary absorbent article <1>. The sanitary absorbent article as described.
<3>
It has an excretion part facing part arranged to face the excretion part of the wearer, and when viewed from above the sanitary absorbent article, the groove is on each of the both sides along the vertical direction in the excretion part facing part. The sanitary absorbent article according to <1> or <2>, which has a portion extending in the longitudinal direction while being curved.
<4>
The sanitary absorbent article according to <3>, wherein the groove has a first slit in a portion extending in the longitudinal direction while being curved.
<5>
The curved groove is a sanitary body according to any one of <3> or <4>, wherein the curved shape has a portion where the distance between the grooves on the both sides in the longitudinal direction is the smallest at the excretory part facing part. Absorbent article.
<6>
The sanitary absorbent article according to <4>, wherein the groove where the first slit overlaps is a portion curved inwardly.
<7>
The sanitary absorbent article according to <6>, wherein the curved groove has a shape having a portion in which the width increases in the longitudinal direction from the portion having the smallest inter-groove distance.
<8>
The absorbent article according to any one of <1> to <7>, wherein the absorbent body has a second slit that does not extend outward from the groove.
<9>
The absorbent body is formed of an absorbent sheet, and the absorbent sheet includes a central absorbent sheet formed in an excretion part-facing portion disposed to face the excretion part of the wearer, and the central absorbent sheet. A main absorbent sheet covering the groove, and the groove is formed on an outer side portion of the central absorbent sheet on the outer side in the lateral direction from the side edge along the vertical direction of the central absorbent sheet. The sanitary absorbent article according to any one of <1> to <8>.
<10>
The absorbent body has a multilayer structure formed of an absorbent sheet, and the first slit penetrates at least the absorbent sheet located closest to the topsheet <1> to <9>. The sanitary absorbent article according to any one of the above.
<11>
The sanitary absorbent article according to <10>, wherein all layers of the absorbent body having the multilayer structure are penetrated.
<12>
The first slit is the sanitary absorbent article according to any one of <1> to <11>, wherein the opening width on the top sheet side is larger than the opening width on the back sheet side.
<13>
The absorber includes the first slit and a second slit that does not extend outward from the groove, and an opening width on the surface sheet side of the first slit and the second slit is 0.05 mm or more. The sanitary absorbent article according to any one of <1> to <12>, which is 1.2 mm or less, preferably 0.07 mm or more and 1.0 mm or less.
<14>
The absorber includes the first slit and a second slit that does not extend outward from the groove, and a back sheet side opening width of the first slit and the second slit is 0.1 mm or more and 1 The sanitary absorbent article according to <12> or <13>, which is 0.5 mm or less, more preferably 0.2 mm or more and 1.2 mm or less.
<15>
The sanitary absorbent article according to any one of <1> to <14>, wherein the groove is a compressed groove.
<16>
<1>-<15> which has the excretion part opposing part arrange | positioned facing a wearer's excretion part, and the said groove | channel has the longitudinal groove extended in the vertical direction on the both sides of the said excretion part opposing part. The sanitary absorbent article according to any one of the above.
<17>
<16> The sanitary absorbent article according to <16>, wherein a lateral groove extending in the lateral direction is provided in each of a front part positioned forward in the longitudinal direction and a rear part positioned rearward of the excretory part facing part.
<18>
When the first slit is viewed in plan, the length of the portion extending outward from the position overlapping the vertical groove is longer than the length of the portion extending inward from the position overlapping the vertical groove. The sanitary absorbent article according to <16> or <17>.
<19>
The length of the portion extending outward from the portion overlapping the groove of the first slit is 1 mm or more and 35 mm, preferably 3 mm or more and 20 mm, according to any one of <16> to <18>. Sanitary absorbent article.
<20>
The sanitary absorbent article according to <19>, wherein the groove extends in the longitudinal direction.
<21>
The length of the portion extending inward from the position overlapping the groove of the first slit is 0 mm or more and 35 mm or less, preferably 3 mm or more and 20 mm, according to any one of <16> to <20>. Sanitary absorbent article.
<22>
The sanitary absorbent article according to <21>, wherein the groove extends in the longitudinal direction.
<23>
When the first slit is viewed in plan, the angle formed by the first slit and the groove is 2 degrees or more and 90 degrees or less, preferably 5 degrees or more and 80 degrees or less, and any one of <1> to <22> The sanitary absorbent article as described in 1.
<24>
The sanitary absorbent article according to <23>, wherein the groove is a groove extending in the longitudinal direction.
<25>
The sanitary absorbent article according to any one of <1> to <24>, wherein the hemagglutinating agent is a cationic polymer.
<26>
The physiologically absorbent article according to <25>, wherein the cationic polymer has a molecular weight of 2,000 to 10,000,000, preferably 2,000 to 5,000,000.
<27>
The absorbent body has a polymer-rich region with a relatively high amount of superabsorbent polymer and a fiber-rich region with a relatively small amount of superabsorbent polymer, and the fiber-rich region is disposed on the skin facing surface side. The sanitary absorbent article according to any one of <1> to <26>, wherein the hemagglutinating agent is present in at least a fiber-rich region in the portion to be used.
<28>
The sanitary absorbent article according to any one of <1> to <27>, wherein the topsheet has an uneven structure.

  Hereinafter, the sanitary absorbent article of 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 basic structure as that of the sanitary napkin 1 shown in FIGS. 1 to 3 having the absorbent body shown in FIGS. 4 and 5 was produced, and this was used as a sample of Example 1. As the surface sheet, one prepared by the following method was used. A moisture-permeable resin film was used as the back sheet.
(Preparation of surface sheet)
A core-sheath type composite fiber (core is polypropylene, sheath is polyethylene) having a fiber diameter of 4.0 dtex elongation rate of 6%, and a non-extendable core-sheath type composite fiber (core is polyethylene terephthalate, sheath is 3.3 dtex) Polyethylene) is passed through a card machine at a ratio of 50 wt% to form a web, and the web is introduced into a heat embossing device, and linear depressions 20 (first linear depressions 20a and second A plurality of linear depressions 20b) were formed. Next, the web was introduced into a hot air spraying apparatus, and hot air treatment was performed by air-through processing to obtain a surface sheet having a partitioned region 22 partitioned by a linear depression 20. The formation pattern of the linear depressions 20 of the obtained topsheet is the pattern shown in FIG. 7, and the width W1 of each of the first and second linear depressions 20a and 21b is 0.5 mm, the first line The interval between the two dents 20a and the interval W2 between the second linear dents 20b are 6 mm, and the angle α between the first linear dent 20a and the second linear dent 20b is 56. °. Incidentally, the basis weight of the resulting surface sheet was 25 g / m ^2.
As an absorptive sheet which comprises an absorber, it created according to Example 2 of patent 2963647. However, High Bulk Additive HBA manufactured by Weyerhauser Paper was used as the crosslinked pulp, and Aqualic CA manufactured by Nippon Shokubai Co., Ltd. was used as the highly absorbent polymer. In this absorber preparation step, a hemagglutinating agent was previously contained in the absorbent paper to be overlapped with the fiber web sprinkled with the superabsorbent polymer. As a result, the hemagglutinating agent was present more in the absorbent paper in the fiber rich region FT than in the fiber web in which the superabsorbent polymer in the polymer rich region PT was dispersed. As the cationic polymer contained in the hemagglutinating agent, trade name Marcoat 106 manufactured by Nippon Lubrizol Co., Ltd. (polydiallyldimethylammonium chloride which is a quaternary ammonium salt homopolymer, weight average molecular weight 15,000, IOB value 2) 10 and a streaming potential of 6700 μeq / L) were used. The basis weight of the cationic polymer applied to the absorbent sheet was 1.5 g / m ² for each of the front-side absorbent sheet 401a and the back-side absorbent sheet 401b. And the hemagglutinating agent 8 was distribute | arranged only to the main body absorbent sheet 401 which forms the 2 layer structure which consists of the surface side absorbent sheet 401a and the back surface side absorbent sheet 401b like the absorber shown in FIG. That is, the hemagglutinating agent 8 is not arranged on the central absorbent sheet 402 forming the three-layer structure. Furthermore, the longitudinal slit was arrange | positioned in the absorber as illustrated in FIG. 1, and the pressing groove was arrange | positioned as illustrated in FIG. The slit had a width W44 of 0.5 mm in the horizontal direction, a vertical length L44 of 20 mm, and an interval D44 between the vertical slits of 12 mm. A plurality of first slits were formed by arranging the slits in this way.

<Examples 2 and 3>
In the sample of Example 1, the hemagglutinating agent was replaced with the following compounds, and the samples of Examples 2 and 3 were prepared in the same manner as in Example 1 except that.
Example 2: Trade name PAS-H-5L manufactured by Nitto Bo Medical Co., Ltd. (polydiallyldimethylammonium chloride which is a quaternary ammonium salt homopolymer, weight average molecular weight 30,000, flow potential 7447 μeq / L, IOB 2.1)
Example 3: Trade name Marcoat 100 manufactured by Nippon Lubrizol Co., Ltd. (polydiallyldimethylammonium chloride which is a quaternary ammonium salt homopolymer, weight average molecular weight 150,000, streaming potential 7488 μeq / L, IOB 2.1)

<Comparative example>
In the sample of Example 1, the absorber was changed to an absorber that was not provided with a hemagglutinating agent but was provided with a slit, and other than that was made in the same manner as in Example 1 to produce a sample of a comparative example.

<Reference example>
In the sample of Example 1, the absorber was changed to an absorber that was not provided with a slit but was provided with a hemagglutinating agent, and other than that, a sample of a reference example was produced in the same manner as in Example 1. The reference example is not a prior art, but is disclosed for easy understanding of the effects of the present invention.

[Evaluation]
About the sample (sanitary napkin) of Examples 1 to 3, the sample of the comparative example (sanitary napkin) and the sample of the reference example (sanitary napkin), the dynamic diffusion area and the dynamic lateral diffusion length are respectively shown below. The method was evaluated. The results are shown in Table 2 below.

<Measurement of dynamic diffusion area and dynamic lateral diffusion length>
Each sample of Examples 1 to 3, Comparative Example and Reference Example was evaluated using the movable female waist model described in paragraphs [0082] and [0083] of JP-A-9-187476. After putting each sample on a movable female waist model and putting on shorts, walking at a speed of 100 steps / minute, injecting pseudo blood 2g after walking for 1 minute (pseudo blood injection speed is 2g for 15 seconds) Then, walk further, walk for 3 minutes, add 2 g of pseudo blood (pseudo blood infusion rate is 2 g for 15 seconds), walk for another 3 minutes, then remove the napkin from the movable female waist model, The area where the pseudo blood on the absorber was attached was measured. Measurement of the diffusion area was performed by using a NEWQUE (manufactured by NEXTUS) (ver. 4.20) as an image analysis apparatus (through a CCD camera or a scanner) to capture an image. Further, the maximum length diffused in the lateral direction (dynamic lateral diffusion length) was determined using the captured image.
The simulated blood was measured using a B-type viscometer (Model No. TVB-10M manufactured by Toki Sangyo Co., Ltd., measurement conditions: rotor No. 19, 30 rpm, 25 ° C., 60 seconds) as described in this specification. The blood cell / plasma ratio of defibrinated horse blood (manufactured by Japan Biotest Laboratories Co., Ltd.) was prepared so that the viscosity obtained was 8 mPa · s.

  According to the results in Table 2, the sanitary napkins of Examples 1 to 3 have a larger dynamic diffusion area in the absorbent body and a dynamic lateral diffusion length than the sanitary napkins of the comparative example and the reference example. I found it long. Therefore, the sanitary napkins of Examples 1 to 3 can effectively utilize the portion located outside the compressed groove in the absorbent body as compared with the sanitary napkins of the comparative example and the reference example. For this reason, it can be expected that the leakage of body fluid from the side can be suppressed. Moreover, it can also be expected to suppress the return of body fluid absorbed by the absorber.

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 401 Main body absorbent sheet 401a Front side absorbent sheet 401b Back side absorbent sheet 402 Central absorbent sheet 402a Upper absorbent sheet 402b Lower absorbent sheet 402c Intermediate absorbent sheet 41 Super absorbent Polymer 44 Slit 441 First slit 442 Second slit 8 Hemagglutinating agent 9 Press groove 91 Lateral press groove 92 Vertical press groove FT Fiber rich region PT Polymer rich region

Claims (7)

A sanitary absorption comprising an absorbent body containing a superabsorbent polymer, and a top sheet and a back sheet sandwiching the absorbent body, and having a longitudinal direction corresponding to the wearer's longitudinal direction and a transverse direction perpendicular to the longitudinal direction A sex product,
On the skin facing surface, the top sheet and the absorbent body are integrated, provided with a groove having a bottom on the back sheet side,
Contains a hemagglutinating agent on the skin or the skin-facing surface side of the absorber, or
The absorbent body has a first slit that extends outwardly in the longitudinal direction or the lateral direction from a position overlapping the groove when the sanitary absorbent article is viewed in plan view. .   The first slit is disposed so as to extend outward and inward in the longitudinal direction or the lateral direction from a position overlapping with the groove in a plan view of the sanitary absorbent article. The sanitary absorbent article according to 1. It has an excretion part facing part arranged opposite to the excretion part of the wearer,
The said groove | channel has the part extended in the vertical direction, curving in each of the both sides along the said vertical direction in the said excretion part opposing part in planar view of the said sanitary absorbent article. The sanitary absorbent article as described.   The sanitary absorbent article according to any one of claims 1 to 3, wherein the absorbent body has a second slit that does not extend outward from the groove. The absorbent body is formed of an absorbent sheet, and the absorbent sheet includes a central absorbent sheet formed in an excretion part-facing portion disposed to face the excretion part of the wearer, and the central absorbent sheet. A main body absorbent sheet for covering,
The said groove | channel is any one of Claims 1-4 currently formed in the outward side part of the said horizontal direction outer side rather than the side edge along the said vertical direction of the said central absorbent sheet in the said main body absorbent sheet. The sanitary absorbent article according to 1. The absorber has a multilayer structure formed of an absorbent sheet,
The sanitary absorbent article according to any one of claims 1 to 5, wherein the first slit penetrates all layers of the absorbent body having a multilayer structure.   The sanitary absorbent article according to any one of claims 1 to 6, wherein the first slit has an opening width on the top sheet side larger than an opening width on the back sheet side.

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