TWI716514B - Absorbent articles - Google Patents

Abstract

The absorbent article (1) is provided with an absorbent body (4) containing a super absorbent polymer (41), pulp (42) and a blood flocculant (43) that can absorb blood. The absorbent body (4) has a relatively high mass ratio of the superabsorbent polymer (41) relative to the mass of the pulp (42) and the mass of the superabsorbent polymer (41) when viewed in section. The polymer area (PT) and the relatively low pulp-rich area (FT). The blood flocculant (43) is more present in the polymer-rich area (PT) than in the pulp-rich area (FT).

Description

Absorbent articles

The present invention relates to an absorbent article.

It is known that an agent that acts on the blood itself to change the blood state is applied to an absorbent article to improve the performance of the absorbent article. Patent Document 1 discloses a menstrual pad containing an absorbent pad containing a salt containing multivalent ions. Patent Document 2 discloses sanitary napkins containing partially hydrated dicarboxylic anhydride copolymers or polycations as blood gelling agents. Patent Document 3 proposes a personal care absorbent article containing a triblock polymer or polycation containing polypropylene oxide and polyethylene oxide as a fluid treatment material.

In addition, the applicant previously proposed an absorbent article containing a blood coagulant containing a water-soluble metal compound in an absorbent core (refer to Patent Document 4).

Prior art literature Patent literature

Patent Document 1: Japanese Patent Publication No. 38-17449

Patent Document 2: Japanese Patent Laid-Open No. 57-153648

Patent Document 3: Japanese Patent Special Form No. 2002-528232

Patent Document 4: Japanese Patent Laid-Open No. 2005-287997

The present invention relates to a blood-absorbable body having an absorbent body containing a superabsorbent polymer, hydrophilic fibers and blood flocculants, and a front sheet and a back sheet sandwiching the absorbent body Absorbent articles. The absorbent body has a relatively high polymer-rich region and a relatively high polymer-rich area relative to the total mass of the hydrophilic fiber and the mass of the super-absorbent polymer. The polymer-rich area is relatively low in the area rich in hydrophilic fibers. The blood flocculant is more present in the polymer-rich area than the hydrophilic fiber-rich area.

1: Sanitary napkin

2: Front sheet

3: Back sheet

4: Absorber

5: The second sheet

7: Side sheet

10: Absorbent body

10S: Flank

10W: Wing guard

41: Super absorbent polymer

42: Pulp

43: blood flocculant

44: Longitudinal slit

44S: slit area

44S1: Central slit area

61: The first bonding wire

62: 2nd bonding wire

401: body absorbent sheet

401a: Front side absorbent sheet

401b: Backside absorbent sheet

402: Central absorbent sheet

402a: Upper side absorbent sheet

402b: Backside absorbent sheet

402c: Intermediate absorbent sheet

403: Middle and High

A: Front

B: Opposite part of excretion part

C: Rear

D44: interval

FT: Area rich in pulp

L44: Length

P: Ministry of Space

PT: polymer-rich area

W44: width

X: portrait

Y: horizontal

Figure 1 is a plan view of a menstrual sanitary napkin which is a preferred embodiment of the menstrual blood absorption absorbent article of the present invention.

Fig. 2 is a plan view showing the skin-facing side (front sheet side) of the absorbent body of the menstrual sanitary napkin shown in Fig. 1.

Fig. 3 is a schematic cross-sectional view taken along the line III-III of Fig. 2.

Fig. 4 is an enlarged cross-sectional view of the absorbent body of the menstrual napkin shown in Fig. 1.

Fig. 5 is an enlarged schematic cross-sectional view of one of the main parts of the absorbent sheet constituting the absorbent body shown in Fig. 4.

Fig. 6 is an enlarged cross-sectional view of an absorbent body of another embodiment included in the absorbent article of the present invention.

Fig. 7 is an enlarged cross-sectional view of an absorbent body according to another embodiment included in the absorbent article of the present invention.

In Patent Documents 1 and 4, except for the use of a water-soluble metal compound as a blood coagulant, there is no description about the structure to increase the absorption rate of blood. On the other hand, although the absorbent articles described in Patent Document 2 and Patent Document 3 describe that fluid treatment agents containing polycations can be used, they actually only disclose information on non-ionic treatment materials. Also, in those disclosed In the technique, it takes time to absorb blood, and it is also disadvantageous in terms of so-called liquid regurgitation in which blood returns to the skin side during wearing.

Therefore, the subject of the present invention is to provide an absorbent article that can solve the above-mentioned shortcomings of the prior art.

Hereinafter, the absorbent article for menstrual blood absorption of the present invention will be described based on the menstrual sanitary napkin 1 (hereinafter also referred to as "sanitary napkin 1") as one of its preferred embodiments with reference to the drawings. The sanitary napkin 1 includes an absorbent body 4 including an absorbent sheet containing a superabsorbent polymer 41, a hydrophilic fiber, and a blood flocculating agent 43, and a front sheet 2 and a back sheet 3 that sandwich the absorbent body 4. Preferably, FIG. 1 shows a plan view of a sanitary napkin as a preferred embodiment of the menstrual blood absorption absorbent article of the present invention, and FIG. 2 shows the skin of the absorbent body 4 shown in FIG. 1 A plan view of the opposite side (front sheet side). Fig. 3 shows a cross-sectional view of the sanitary napkin 1 of this embodiment.

In this embodiment, as shown in Figures 1 to 3, the sanitary napkin 1 has an absorbent body 10, which is provided with a liquid-permeable front sheet 2 forming a skin-facing surface and a back sheet forming a non-skin-facing surface 3. And the absorbent body 4 between the two sheets 2 and 3 and containing an absorbent sheet containing pulp 42 and blood flocculant 43.

As shown in Figure 1, the absorbent body 10 of the sanitary napkin 1 has an excretory opposing portion B arranged to face the wearer's excretory (vaginal opening, etc.) when worn, and is arranged closer to the excretory opposing portion B The ventral side (front side) of the wearer's anterior portion A, and the excretory portion opposing portion B, are arranged closer to the wearer's back (rear) rear portion C. The sanitary napkin 1 and the absorbent body 10 have a longitudinal direction X corresponding to the front and rear directions of the wearer and a transverse direction Y orthogonal to the longitudinal X. That is, the absorptive main body 10 is divided into the front part A, the excretion part opposing part B, and the rear part C in this order in the longitudinal direction X.

In addition, in this specification, the skin facing surface is the sanitary napkin 1 or its constituent members (for example, the front The surface of the sanitary napkin 1 in the sheet 2) faces the wearer's skin side when worn, and the non-skin facing surface is the sanitary napkin 1 or the sanitary napkin 1 in its constituent members when worn facing the opposite side of the skin side (clothing Side) of the surface. In addition, the longitudinal direction X coincides with the longitudinal direction of the sanitary napkin 1 and the absorbent main body 10, and the lateral direction Y coincides with the width direction of the sanitary napkin 1 and the absorbent main body 10 (the direction orthogonal to the longitudinal direction).

In this embodiment, as shown in Figs. 1 and 3, the sanitary napkin 1 in addition to the absorbent main body 10, further has the excretory portion facing portion B in the absorbent main body 10, respectively, on both sides along the longitudinal direction X A pair of wing parts 10W and 10W extend from the outer side of the lateral direction Y.

Furthermore, in the absorbent article of the present invention, when the excretory portion facing portion B has the wing portion 10W like the sanitary napkin 1 of the present embodiment, it refers to the longitudinal direction of the absorbent article (the absorbent article The length direction, the X direction in the figure) has a region of the wing portion 10W (the region sandwiched between the root of one wing portion 10W in the longitudinal direction X and the root portion of the other wing portion 10W in the longitudinal direction X). The opposite part B of the excretion part of an absorbent article without wing parts refers to the absorbent article that is generated when the absorbent article is folded into a three-folded single packaging form in the horizontal direction (the width direction of the absorbent article, the figure The two bending lines (not shown) that cross in the Y direction in the middle are the area enclosed by the first bending line and the second bending line counting from the front end of the longitudinal X of the absorbent article.

In the sanitary napkin 1 of this embodiment, the front sheet 2 covers the entire area of the skin-facing surface of the absorbent body 4 as shown in FIG. 1, and extends from the both sides of the absorbent body 4 along the longitudinal direction X to the lateral direction Y outer side Extension. On the other hand, the back sheet 3 covers the entire area of the non-skin facing surface of the absorber 4, and further extends from the both sides of the absorber 4 in the longitudinal direction X to the outer side of the transverse direction Y, and the following side sheet 7 collectively form the side wing portion 10S. The front sheet 2 and the back sheet 3 are joined to each other at the extended part from the both ends of the longitudinal direction X of the absorbent body 4 by a well-known joining means such as an adhesive, heat sealing, and ultrasonic sealing. Furthermore, each of the top sheet 2 and the back sheet 3 and the absorber 4 may be joined by an adhesive.

In the sanitary napkin 1, as shown in Figures 1 and 3, the side sheets 7 are arranged on both sides along the longitudinal direction X of the skin facing surface of the absorbent body 10 (the skin facing surface of the front sheet 2) . Preferably, the side sheet 7 is arranged over the entire length of the longitudinal direction X of the absorbent body 10 so as to overlap the left and right sides of the absorbent body 4 along the longitudinal direction X in a plan view.

In the sanitary napkin 1, a pair of side sheets 7 and 7 are shown in FIG. 1, respectively, on the linear first joining line 61 located at the opposite portion B of the excretion part and the longitudinal direction X of the first joining line 61 The linear second joining line 62 of the front and rear (front part A and rear part C) is joined to the front sheet 2. The first joining line 61 is a curved line projecting toward the outer side of the transverse direction Y in a plan view, and the second joining line 62 is a linear (Z-shaped line) extending in a plan view so as to alternately cross in the longitudinal direction. In this way, if the side sheet 7 is joined to the front sheet 2 at the first joining line 61 and the second joining line 62 and fixed to the skin-facing surface of the absorbent body 10, as shown in FIG. The bonding line 61 and the second bonding line 62 form a space P partitioned by the side sheet 7 and the front sheet 2 on the inner side of the lateral direction Y. The space P opens toward the center of the absorptive body 10 in the lateral direction Y. Therefore, body fluids such as menstrual blood flowing from the center of the lateral direction Y to the outside are contained in the space P. As a result, the leakage of body fluids can be effectively prevented. Furthermore, an elastic member extending in the longitudinal direction X may be arranged at the free ends of each of the pair of side sheets 7, 7 and a pair of leak-proof flanges along the longitudinal direction X may be arranged. Leak-proof flanging is a kind of standing property to prevent side leakage of menstrual blood excreted to the opposite side of the skin.

In the sanitary napkin 1, as shown in FIG. 1, the side flaps 10S protrude from the excretion portion opposite portion B toward the outer side of the transverse direction Y, whereby an absorbent body 10 extends on the left and right sides of the longitudinal direction X. 10W, 10W to the wing part. Moreover, as shown in FIG. 1, the front sheet 2 and the back sheet 3 extend from the front end and the rear end of the absorbent body 4 in the longitudinal direction X to the outside of the longitudinal direction X, respectively. Well-known joining means such as sealing and ultrasonic sealing are joined to each other to form an end seal.

The wing part 10W is folded back to the non-skin facing side of the crotch part of clothing such as shorts for the user. In the sanitary napkin 1, as shown in FIG. 1, the wing part 10W has a generally trapezoidal shape with a lower bottom (longer side than the upper bottom) located on the side of the absorbent body 10 along the longitudinal direction X in a plan view. On the non-skin facing surface of the wing part 10W, there is formed a wing part adhesive part (not shown) for fixing the wing part 10W (sanitary napkin 1) to clothing (not shown) such as shorts. The wing part adhesive part can be used to adhere and fix the wing part 10W on the non-skin facing surface (outer surface) side of the crotch part of the clothing when in use. In addition, a non-skin facing surface of the absorbent body 10 is also formed with a body adhesive portion (not shown) useful for fixing the absorbent body 10 to clothing such as shorts.

In this embodiment, as shown in FIG. 3, the sanitary napkin 1 has a second sheet 5 including a non-woven fabric arranged between the front sheet 2 and the absorber 4. As shown in FIG. 2, the second sheet 5 covers substantially the entire area of the skin facing surface of the absorber 4 in the sanitary napkin 1. The second sheet 5 is a sheet that is separate from the front sheet 2 and the absorber 4 and is also called a sub-layer sheet in the technical field. The second sheet 5 is a sheet for improving the permeability of the liquid from the front sheet 2 to the absorber 4 or reducing the return of the liquid absorbed into the absorber 4 to the front sheet 2. In the sanitary napkin 1, the second sheet 5 is a sheet that does not contain the following blood flocculant 43.

FIG. 4 shows an enlarged cross-sectional view of the absorbent body 4 in the cross-sectional view shown in FIG. 3. In addition, FIG. 5 shows an enlarged cross-sectional view of a main part of one absorbent sheet constituting the absorber 4 shown in FIG. 4. As shown in FIG. 5, the absorbent body 4 including the absorbent sheet has a three-dimensionally dispersed superabsorbent polymer 41, a pulp 42 as a hydrophilic fiber for fixing the superabsorbent polymer 41, and a blood flocculant 43. The absorbent sheet has a polymer-rich region with a relatively high mass ratio of the super absorbent polymer 41 relative to the total mass of the pulp 42 and the mass of the super absorbent polymer 41 in a cross-sectional view The PT, and the pulp-rich region FT, which is relatively lower than the polymer-rich region PT, which is a hydrophilic fiber-rich region. In sanitary napkin 1, rich in polymers The area PT and the area FT rich in pulp are divided in the thickness direction of the absorbent sheet. The absorbent body 4 including the absorbent sheet contains the pulp 42 and becomes an integral structure containing the superabsorbent polymer 41 and the blood flocculant 43 inside. As the absorbent body 4 including the absorbent sheet, it is preferable to use the adhesive force generated by the super absorbent polymer 41 in a wet state or the adhesive agent or adhesive fiber added to make the pulp 42 between each other. Or the superabsorbent polymer 41 and the pulp 42 are combined to form a sheet. Furthermore, the so-called absorbent sheet refers to an absorbent formed into a sheet shape, which is different from an absorbent having a structure formed by stacking absorbent materials in general. Representative examples of the absorbent sheet include those described in Japanese Patent No. 2963647 and those described in Japanese Patent No. 2955223.

As the superabsorbent polymer 41 possessed by the absorbent body 4, a particulate one is generally used, but a fibrous one may also be used. In the case of using a particulate superabsorbent polymer, its shape can be any of spherical, massive, bag-like or indefinite shape. As the superabsorbent polymer, a polymer or copolymer of acrylic acid or an alkali metal salt of acrylic acid can generally be used. As an example, polyacrylic acid and its salt, and polymethacrylic acid and its salt are mentioned. As the polyacrylate or polymethacrylate, sodium salt is preferably used. In addition, it is also possible to use maleic acid, itaconic acid, acrylamide, 2-acrylamide-2-methyl propanesulfonic acid, 2-(meth)acrylamide ethanesulfonic acid, (methyl ) Co-monomers such as 2-hydroxyethyl acrylate or styrene sulfonic acid are copolymerized with acrylic acid or methacrylic acid within the range that does not reduce the performance of the superabsorbent polymer.

Examples of the hydrophilic fibers possessed by the absorbent body 4 include those obtained by subjecting hydrophobic fibers to a hydrophilization treatment and those having hydrophilic properties. In particular, those that are hydrophilic and have water retention properties can further exhibit the effects of the present invention, and are therefore preferred. As the latter hydrophilic fibers, natural fibers, cellulose-based regenerated fibers, or semi-synthetic fibers can be cited as preferred examples. As hydrophilic fibers, pulp and rayon are particularly preferred, and pulp is more preferred. In sanitary napkin 1, paper pulp 42 is used as a parent Water-based fiber. It is also possible to use, for example, cross-linked cellulose fibers obtained by cross-linking intra-molecular and/or intermolecular of cellulose fibers, or fluffy cellulose fibers obtained by mercerizing wood pulp. Examples of the pulp 42 include natural cellulose fibers such as softwood kraft pulp or hardwood kraft pulp, and natural cellulose fibers such as kapok pulp or straw pulp, but are not limited to these. One type or two or more types of these pulps can be used.

The absorbent article of the present invention contains a blood flocculant 43 in the absorbent body 4. Hereinafter, the blood flocculant used in the present invention will be described. The blood flocculant used in the present invention refers to flocculation of red blood cells in the blood to form a flocculation of red blood cells, which can be separated from plasma components, and preferably has the following properties.

That is, when 1000 ppm of the measurement sample agent is added to the simulated blood, at least two or more red blood cells flocculate to form a flocculation while maintaining the fluidity of the blood.

The above-mentioned simulated blood system uses a B-type viscometer (TVB-10M manufactured by Toki Industry Co., Ltd., measurement conditions: rotor No. 19, 30 rpm, 25° C., 60 seconds) to obtain a viscosity of 8 mPa‧s Those who prepare defibrillated horse blood (manufactured by NIPPON BIO-TEST Research Institute Co., Ltd.) blood cells and plasma ratios.

Here, "the state of maintaining the fluidity of the blood" means that 10 g of the above-mentioned simulated blood added with the measurement sample agent 1000 ppm is put into a spiral vial (product number "Spiral Tube No. 4" manufactured by Maruemu Corporation, with an inner diameter of 14.5) mm, the main body diameter is 27mm, the total length is 55mm), when the spiral vial containing the simulated blood is reversed 180 degrees, the state of the simulated menstrual blood flow with more than 60% of the volume within 20 seconds.

Also, whether or not "two or more red blood cells flocculate to form a floc" is judged as follows. That is, the above-mentioned simulated blood added with 1000 ppm of the measurement sample agent is diluted to 4000 times with physiological saline, and a laser diffraction/scattering type particle size distribution measuring device (manufactured by HORIBA) is used. Model: LA-950V2, measurement conditions: flow cell measurement, cycle speed 1, no ultrasonic) laser diffraction scattering method, the volume average particle size measured at a temperature of 25 ℃, the median particle size is 2 When the size of the flocculated flocculated by the above red blood cells is equivalent to 10μm or more, it is judged that "2 or more red blood cells flocculate to form a flocculent".

In the sanitary napkin 1, the blood flocculant 43 contained in the absorbent body 4 contains a cationic polymer. Examples of cationic polymers include cationized cellulose, cationized starches such as hydroxypropyltrimethylammonium chloride starch, and the like. In addition, the blood flocculant 43 may also include a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer, or a quaternary ammonium salt condensation polymer as a cationic polymer. The "quaternary ammonium salt" in the present invention includes compounds having a positive univalent charge at the position of a nitrogen atom, or compounds that generate a positive univalent charge at the position of a nitrogen atom by neutralization. Specific examples thereof include Quaternary ammonium cation salts, tertiary amine neutralization salts, and tertiary amines with cations in aqueous solutions. The "quaternary ammonium part" described below is also used in the same meaning, and refers to the positively charged part of the water. In addition, the term "copolymer" in the present invention refers to a polymer obtained by copolymerization of two or more polymerizable monomers, and includes both binary copolymers and ternary copolymers. The term "condensate" in the present invention refers to a polycondensate obtained by polymerizing a condensation product containing two or more monomers. When the blood flocculant 43 includes a quaternary ammonium salt homopolymer and/or a quaternary ammonium salt copolymer and/or a quaternary ammonium salt polycondensate as a cationic polymer, the blood flocculant 43 may include a quaternary ammonium salt Any one of a salt homopolymer, a quaternary ammonium salt copolymer, and a quaternary ammonium salt polycondensate, or a combination of any two or more. Moreover, the quaternary ammonium salt homopolymer can be used individually by 1 type or in combination of 2 or more types. Similarly, a quaternary ammonium salt copolymer can be used individually by 1 type or in combination of 2 or more types. Furthermore, similarly, a quaternary ammonium salt polycondensate can be used individually by 1 type or in combination of 2 or more types. Furthermore, the "blood flocculant" in this specification refers to a compound or a combination of compounds that can flocculate red blood cells in the blood, and an agent that expresses the flocculation of red blood cells through the combination of compounds. which is, The so-called blood flocculant refers to an agent limited to those with blood cell flocculation. Therefore, when the blood flocculant contains the third component, it is expressed as a blood flocculant composition, which is different from the blood flocculant.

Among the above-mentioned various cationic polymers, it is particularly preferable to use a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer, or a quaternary ammonium salt polycondensate in terms of the adsorbability to red blood cells. In the following description, for the sake of simplicity, the quaternary ammonium salt homopolymer, quaternary ammonium salt copolymer and quaternary ammonium salt polycondensate are collectively referred to as "quaternary ammonium salt polymer".

The quaternary ammonium salt homopolymer is obtained by using a polymerizable monomer having a quaternary ammonium site and polymerizing it. On the other hand, the quaternary ammonium salt copolymer uses at least one polymerizable monomer having a quaternary ammonium site, if necessary, at least one polymerizable monomer without a quaternary ammonium site, and the Winner of copolymerization. That is, the quaternary ammonium salt copolymer is obtained by using two or more polymerizable monomers having quaternary ammonium sites and copolymerizing these, or using more than one polymerizable monomer having quaternary ammonium sites and one The above polymerizable monomers without quaternary ammonium sites are obtained by copolymerizing these. 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 using a condensate containing one or more monomers having a quaternary ammonium site and polymerizing the condensate. That is, the quaternary ammonium salt polycondensate is obtained by polymerizing the condensate of two or more monomers having quaternary ammonium moieties, or using one or more monomers having quaternary ammonium moieties and one or more types It is obtained by condensation polymerization of monomers without quaternary ammonium sites.

Quaternary ammonium salt polymers are cationic polymers with quaternary ammonium sites. The quaternary ammonium site can be generated by quaternary ammoniumization of a tertiary amine using an alkylating agent. Or, tertiary amine can be dissolved in acid or water and generated by neutralization. Alternatively, it can be produced by quaternary ammonium using a nucleophilic reaction including a condensation reaction. As the alkylating agent, for example, a halogenated alkyl group or dimethyl sulfate And dialkyl sulfates such as dimethyl sulfate. If the dialkyl sulfate of these alkylating agents is used, the problem of corrosion that may occur when halogenated alkyl is used will not occur, so it is preferable. 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, if a quaternary ammonium salt polymer obtained by quaternary ammoniumization of a tertiary amine site with an alkylating agent is used, the electric double layer of red blood cells can be reliably neutralized, which is preferable. The quaternary ammoniumization using the nucleophilic reaction including the condensation reaction can be produced by the ring-opening polycondensation reaction of dimethylamine and epichlorohydrin, and the cyclization reaction of dicyandiamide and diethylene triamine.

As a result of research conducted by the inventors, it has been found that the use of a cationic polymer is particularly effective in order to generate flocculation of red blood cells in menstrual blood. The reason is as follows. The red blood cell has a red blood cell membrane on its surface. The red blood cell membrane has a double-layer structure. The two-layer structure includes the red blood cell membrane skeleton as the lower layer and the lipid membrane as the upper layer. The lipid film exposed on the surface of red blood cells contains a protein called glycophorin. Glycophorin has a sugar chain to which an anionically charged sugar called sialic acid is bonded at its end. As a result, red blood cells can be treated as anionically charged colloidal particles. The flocculation of colloidal particles generally uses flocculants. Considering that red blood cells are anionic colloidal particles, the use of cationic substances as flocculants is advantageous in terms of neutralizing the electric double layer of red blood cells. In addition, if the flocculant has polymer chains, entanglement of the polymer chains of the flocculant adsorbed on the surface of the red blood cells is likely to occur, thereby promoting the flocculation of the red blood cells. Furthermore, when the flocculant has a functional group, the interaction between the functional groups also promotes the flocculation of red blood cells, which is preferable.

From the viewpoint of efficiently producing flocculation of red blood cells, the cationic polymer preferably has a molecular weight of 2,000 or more, more preferably 10,000 or more, and more preferably 30,000 or more. By making the molecular weight of the cationic polymer above this value, the cations between the red blood cells are sufficiently generated The entanglement of cationic polymers or the cross-linking of cationic polymers between red blood cells. The upper limit of the molecular weight is preferably 10 million or less, more preferably 5 million or less, and more preferably 3 million or less. By making the molecular weight of the cationic polymer below this value, the cationic polymer dissolves well in menstrual blood. The molecular weight of the cationic polymer is preferably 2,000 or more and 10 million or less, more preferably 2,000 or more and 5 million or less, more preferably 2,000 or more and 3 million or less, still more preferably 10,000 or more and 3 million or less, especially Preferably, it is 30,000 or more and 3 million or less. The molecular weight in the present invention refers to the weight average molecular weight. The molecular weight of the cationic polymer can be controlled by appropriately selecting its polymerization conditions. The molecular weight of the cationic polymer can be measured using HLC-8320GPC manufactured by Tosoh Co., Ltd. The specific measurement conditions are as follows. As the column, a column temperature of 40°C was used to connect a protective column α manufactured by Tosoh Co., Ltd. and an analytical column α-M in series. The detector uses RI (refractive index). As a measurement sample, 1 mg of the treatment agent (quaternary ammonium salt polymer) to be measured was dissolved in 1 mL of the eluent. Copolymers containing water-soluble polymerizable monomers such as hydroxyethyl methacrylate use an eluent obtained by dissolving 150 mmol/L of sodium sulfate and 1% by mass of acetic acid in water. Hydroxyethyl methacrylate and other copolymers containing water-soluble polymerizable monomers are used based on molecular weight standards such as amylopectin with a molecular weight of 5,900, amylopectin with a molecular weight of 47,300, amylopectin with a molecular weight of 212,000, and a branch with a molecular weight of 788,000. Amylopectin mixture made by dissolving 2.5 mg of each amylopectin in 10 mL of eluent. Copolymers containing water-soluble polymerizable monomers such as hydroxyethyl methacrylate are measured under the conditions of flow rate: 1.0 mL/min and injection volume: 100 μL. Except for copolymers containing water-soluble polymerizable monomers such as hydroxyethyl methacrylate, it is made by dissolving 50mmol/L of lithium bromide and 1% by mass of acetic acid in ethanol:water=3:7 (volume ratio) Eluent. Except for copolymers containing water-soluble polymerizable monomers such as hydroxyethyl methacrylate, the molecular weight standard uses polyethylene glycol (PEG) with molecular weight of 106, PEG with molecular weight of 400, and molecular weight of 1470. PEG, PEG with a molecular weight of 6450, polyethylene oxide (PEO) with a molecular weight of 50,000, PEO with a molecular weight of 235,000, and PEO with a molecular weight of 875,000 are each dissolved in a PEG-PEO mixture in 20 mL of the eluent. Except for copolymers containing water-soluble polymerizable monomers such as hydroxyethyl methacrylate, it is measured under the conditions of flow rate: 0.6 mL/min and injection volume: 100 μL.

From the viewpoint of more effectively generating flocculation of red blood cells, when a quaternary ammonium salt polymer is used as a cationic polymer, the streaming potential of the quaternary ammonium salt polymer is preferably 1500 μeq/L or more , More preferably 2000 μeq/L or more, more preferably 3000 μeq/L or more, and still more preferably 4000 μeq/L or more. By making the streaming potential of the quaternary ammonium salt polymer equal to or higher than this value, the electric double layer of red blood cells 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 more preferably 6000 μeq/L or less. By making the streaming potential of the quaternary ammonium salt polymer below this value, the quaternary ammonium salt polymer adsorbed on the red blood cells can effectively prevent the electrical repulsion of each other. The streaming potential of the quaternary ammonium salt polymer is preferably 1500 μeq/L or more and 13000 μeq/L or less, more preferably 2000 μeq/L or more and 13000 μeq/L or less, more preferably 3000 μeq/L or more and 8000 μeq/L or less, and More preferably, it is 4000 μeq/L or more and 6000 μeq/L or less. The streaming potential of the quaternary ammonium salt polymer can be adjusted, for example, by adjusting the molecular weight of the cationic monomer itself, the molar ratio of the cationic monomer constituting the copolymer and the anionic monomer or nonionic monomer. Take control. The streaming potential of the quaternary ammonium salt polymer can be measured using a streaming potential meter (PCD04) manufactured by Spectris Co., Ltd. The specific measurement conditions are as follows. First, by using a dryer or the like to heat a commercially available sanitary napkin, the thermal fusion of each component is invalidated, and it is decomposed into components such as a front sheet, an absorber, and a back sheet. The decomposed components are subjected to a multi-stage solvent extraction method from non-polar solvent to polar solvent, and the treatment agent used for each component is separated to obtain a solution containing a single composition. Dry and solidify the obtained solution, and combine 1H-NMR (nuclear magnetic resonance method), IR (Red Spectroscopy), LC (liquid chromatography), GC (gas chromatography), MS (mass analysis), GPC (gel permeation chromatography), fluorescent X-ray, etc., identification treatment agent The structure. For a measurement sample prepared by dissolving 0.001 g of the treatment agent (quaternary ammonium salt polymer) of the measurement object in 10 g of physiological saline, titrate a 0.001 N sodium polyvinyl sulfonate aqueous solution (when the measurement sample has a negative charge, it is 0.001N polydiallyldimethylammonium chloride aqueous solution), measure the titration X mL required until the potential difference between the electrodes disappears. Thereafter, according to Formula 1, the streaming potential of the quaternary ammonium salt polymer was calculated.

Streaming potential=(X+0.190※)×1000‧‧‧Formula 1

(※The titration required for the solvent of physiological saline)

In order for the cationic polymer to be smoothly adsorbed on the surface of the red blood cells, it is advantageous that the cationic polymer easily interacts with the sialic acid present on the surface of the red blood cells. From this point of view, the inventors of the present invention conducted research and found that the ratio of the inorganic value to the organic value of a substance, that is, the value of inorganic value/organic value (hereinafter referred to as "IOB (Inorganic Organic Balance) Sex ratio) value ") is a scale to evaluate the degree of interaction between the sialic acid conjugate and the cationic polymer. In detail, it turned out that it is more advantageous to use a cationic polymer having an IOB value that is the same as or close to the IOB value of the sialic acid conjugate. The so-called sialic acid conjugate refers to a compound in which sialic acid can exist in an organism, and examples thereof include compounds in which sialic acid is bound to the ends of glycolipids such as galactolipids.

Generally speaking, the properties of substances are largely governed by various intermolecular forces between molecules. The intermolecular forces are mainly composed of Van der Waals force based on molecular mass and electrical affinity based on molecular polarity. As long as the Van der Waal’s force and the electrical affinity that have a greater impact on the change in the nature of the substance can be grasped individually, the combination can be used to predict the unknown substance or its mixture. Traits. This research method is a well-known theory as "Organic Concept Graph Theory". The organic concept graph theory is described in detail in, for example, "Organic Analysis" by Fujita Mu (Kaniya Bookstore, 1930), Fujita Mu's "Organic Qualitative Analysis: Systematic. Pure Matter Edition" (Kyoritsu Publishing, 1953), Fujita Mu "Adapted Chemical Experiments-Organic Chemistry" (Kawaide Shobo, 1971), Fujita Mu and Akatsuka's "Systematic Organic Qualitative Analysis (Mixture Edition)" (Kazama Shobo, 1974), and Koda Yoshio. "The Basics and Application of the New Version of Organic Concept Map" by Shiro Sato and Yoshio Honma (Sankyo Publishing, 2008), etc. In organic conceptual graph theory, regarding the physical and chemical properties of matter, the degree of physical properties mainly produced by Van der Waal’s force is called "organicity", and the degree of physical properties mainly produced by electrical affinity is called "inorganic" "Nature" expresses the physical properties of matter as a combination of "organic" and "inorganic". Furthermore, 1 carbon (C) is defined as organic 20. In contrast, the inorganic and organic values of various polar groups are defined as described in Table 1 below, and the sum of the inorganic and organic values is calculated The ratio of the two values is defined as the IOB value. In the present invention, the IOB value of the sialic acid conjugate is determined based on the organic and inorganic values, and the IOB value of the cationic polymer is determined based on this 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 as a cationic polymer used in Example 1 below, it has an organic value of -C-×8=160, amino acid salt and NH4 Salt×1=400 for the inorganic value, ring (non-aromatic single ring)×1=10 for the inorganic value, and -Cl×1=40 for the organic value and 10 for the inorganic value, so the inorganic value is The total is 400+10+10=420, and the total organic value is 160+40=200. Therefore, the IOB value becomes 420/200=2.10.

On the other hand, when the cationic polymer is a copolymer, the IOB value is calculated in the following order corresponding to the molar ratio of the monomer used for copolymerization. That is, the 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, the inorganic value is INB, and the value of monomer A/ When the molar ratio of monomer B is MA/MB, the IOB value of the copolymer is calculated by the following formula.

The IOB value of the cationic polymer thus determined is preferably 0.6 or more, more preferably 1.8 or more, still more preferably 2.1 or more, and more preferably 2.2 or more. Furthermore, the IOB value of the cationic polymer is preferably 4.6 or less, more preferably 3.6 or less, and 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, still more preferably 2.1 or more and 3.6 or less, and more preferably 2.2 or more and 3.0 or less. Furthermore, the IOB value of sialic acid is 4.25 in terms of sialic acid alone, and 3.89 in terms of sialic acid conjugate. The above-mentioned sialic acid conjugate refers to the sugar chain in the glycolipid that binds to sialic acid. The ratio of the organic value of the sialic acid conjugate is higher than that of the sialic acid alone, and the IOB value becomes lower.

The IOB value of the cationic polymer is as described above, and the organic value itself is preferably 40 or more, more preferably 100 or more, and more preferably 130 or more. Furthermore, it is preferably 310 or less, more preferably 250 or less, still more preferably 240 or less, and 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 more preferably 130 or more and 190 or less. By setting the organic value of the cationic polymer in this range, the cationic polymer is more smoothly adsorbed on red blood cells.

On the other hand, the inorganic value of the cationic polymer is preferably 70 or more, more preferably 90 or more, more preferably 100 or more, still more preferably 120 or more, and particularly preferably 250 or more. Moreover, it is preferably 790 or less, more preferably 750 or less, more preferably 700 or less, still more preferably 680 or less, and particularly preferably 490 or less. For example, the inorganic value is preferably 70 or more and 790 or less, more preferably 90 or more and 750 or less, more preferably 90 or more and 680 or less, still more preferably 120 or more and 680 or less, and particularly preferably 250 or more and 490 or less . By setting the inorganic value of the cationic polymer in this range, the cationic polymer is more smoothly adsorbed on red blood cells.

From the viewpoint of allowing the cationic polymer to be more smoothly adsorbed on red blood cells, it is preferable that when the organic value of the cationic polymer is set to x and the inorganic value is set to y, x and y satisfy The following formula A.

y=ax (A)

In the formula, a is preferably 0.66 or more, more preferably 0.93 or more, and more preferably 1.96 or more. Furthermore, a is preferably 4.56 or less, more preferably 4.19 or less, and more preferably 3.5 or less. For example, a is preferably a number of 0.66 or more and 4.56 or less, more preferably a number of 0.93 or more and 4.19 or less, and more preferably a number of 1.96 or more and 3.5 or less. In particular, when the organic value and the inorganic value of the cationic polymer are within the above-mentioned range as a condition, and the organic value and the inorganic value of the cationic polymer satisfy the above formula A, the cationic polymer is easy to By interacting with the sialic acid conjugate, the cationic polymer is more easily adsorbed on red blood cells.

From the viewpoint of effectively producing flocculation of red blood cells, the cationic polymer is preferably water-soluble. In the present invention, the so-called "water-soluble" refers to the addition and mixing of 0.05g of powdered cationic polymer with a thickness of less than 1mm or a film-like cationic polymer with a thickness of less than 0.5mm in a 100mL glass beaker (5mmΦ) to 50mL at 25℃ When ion-exchanged water is used, a stirring blade with a length of 20mm and a width of 7mm is placed, and the entire amount is dissolved in water within 24 hours using a magnetic stirrer HPS-100 manufactured by AS ONE Co., Ltd. under stirring at 600 rpm. Furthermore, in the present invention, as a further preferred solubility, it is preferable that the entire amount is dissolved in water within 3 hours, and it is more preferable that the entire amount is 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 site is preferably present in the side chain. In this case, if the main chain and the side chain are bonded at one point, the flexibility of the side chain is not easily hindered, and the quaternary ammonium site existing in the side chain is smoothly adsorbed on the surface of the red blood cells. Especially in the present invention, the main chain and the side chain of the cationic polymer are not hindered from bonding at two or more points. In the present invention, the so-called "bonded at 1 point" means to constitute the main chain One of the carbon atoms is single-bonded to one carbon atom at the end of the side chain. The so-called "bonding at more than 2 points" means that two or more of the carbon atoms constituting the main chain are bonded to two or more carbon atoms located at the end of the side chain, respectively.

When the cationic polymer has a structure with a main chain and multiple side chains bonded to it, for example, a quaternary ammonium salt polymer has a structure with a main chain and multiple side chains bonded to it. In this case, the carbon number of each side chain is preferably 4 or more, more preferably 5 or more, and more preferably 6 or more. The upper limit of the carbon number is preferably 10 or less, more preferably 9 or less, and more preferably 8 or less. For example, the carbon number of the side chain is preferably 4 or more and 10 or less, more preferably 5 or more and 9 or less, and more preferably 6 or more and 8 or less. The carbon number of the side chain refers to the carbon number of the quaternary ammonium site (cation site) of the side chain, and even if carbon is contained in the anion as a counter ion, the carbon is not included in the count. Particularly, when the number of carbon atoms in the side chain from the carbon atom bonded to the main chain to the carbon atom bonded to the quaternary nitrogen is in the above range, when the quaternary ammonium salt polymer is adsorbed on the surface of the red blood cell The steric hindrance is reduced, so it is better.

When the quaternary ammonium salt polymer is a quaternary ammonium salt homopolymer, examples of the homopolymer include polymers of vinyl monomers having quaternary ammonium sites or tertiary amine sites. In the case of polymerizing vinyl monomers with tertiary amine sites, before polymerization and/or after polymerization, it becomes a quaternary ammonium salt homogenizing the tertiary amine site by an alkylating agent. The polymer, either before polymerization and/or after polymerization, becomes a tertiary amine neutralization salt that neutralizes the tertiary amine site by an acid, or becomes a tertiary amine with cations in an aqueous solution after polymerization. Examples of the alkylating agent or acid are as described above.

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

[化1]

As a specific example of a quaternary ammonium salt homopolymer, polyethyleneimine etc. are mentioned. In addition, examples include: poly(2-methacryloxyethyl dimethylamine quaternary salt), poly(2-methyl dimethylamine), which has a side chain having a quaternary ammonium site and the main chain bonded at one point Acrylic acid oxyethyl trimethyl ammonium salt), poly(2-methacrylic acid oxyethyl dimethyl ethyl ammonium methyl sulfate), poly(2-acrylic acid oxy ethyl dimethyl amine) Quaternary salt), poly(2-acryloxyethyl trimethylamine quaternary salt), poly(2-acryloxyethyl dimethyl ethyl ammonium ethyl sulfate), poly(3-dimethylamine) Aminopropyl acrylamide quaternary salt), polydimethylaminoethyl methacrylate, polyallylamine hydrochloride, cationized cellulose, polyethyleneimine, polydimethylamino Propyl acrylamide, polyamidine, etc. On the other hand, as an example of a homopolymer in which the side chain of the quaternary ammonium site is bonded to the main chain at 2 or more points, polydiallyldimethylammonium chloride and polydiallylamine hydrochloride can be cited. .

When the quaternary ammonium salt polymer is a quaternary ammonium salt copolymer, as the copolymer, two or more kinds of polymerizable monomers used in the polymerization of the above-mentioned quaternary ammonium salt homopolymer can be used for copolymerization. The copolymer obtained. Alternatively, as the quaternary ammonium salt copolymer, one or more polymerizable monomers used in the polymerization of the above-mentioned quaternary ammonium salt homopolymer and one or more polymerizable monomers without quaternary ammonium sites can be used Copolymer obtained by copolymerization. Furthermore, in addition to vinyl series In addition to or instead of polymerizable monomers, other polymerizable monomers such as -SO2- etc. are used. The quaternary ammonium salt copolymer may be a binary system copolymer or a ternary system or higher copolymer as described above.

In particular, from the viewpoint of effectively producing flocculations of red blood cells, the quaternary ammonium salt copolymer preferably has the repeating unit represented by the above formula 1 and the repeating unit represented by the following formula 2.

In addition, 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, especially by using cationic polymerizable monomers or non-ionic polymerizable monomers, the quaternary ammonium salt copolymer does not produce a charge offset with the quaternary ammonium site, so it can Effectively produce flocculation of red blood cells. As an example of a cationic polymerizable monomer, as a cationic polymer under specific conditions The cyclic compound of the nitrogen atom includes vinyl pyridine, etc. As a linear compound having a cation-bearing nitrogen atom in the main chain under specific conditions, a condensation compound of dicyandiamide and diethylene triamine is exemplified Wait. Examples of anionic polymerizable monomers include 2-acrylamide-2-methylpropanesulfonic acid, methacrylic acid, acrylic acid, and 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, methyl Hydroxyethyl acrylate, hydroxyethyl acrylate, methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl acrylate, propyl methacrylate, propyl acrylate, butyl methacrylate, butyl acrylate, etc. . These cationic polymerizable monomers, anionic polymerizable monomers, or nonionic polymerizable monomers may be used alone or in combination of two or more of them. In addition, two or more types of cationically polymerizable monomers may be used in combination, two or more types of anionic polymerizable monomers may be used in combination, or two or more types of nonionic polymerizable monomers may be used in combination. Regarding the quaternary ammonium salt copolymer copolymerized using cationic polymerizable monomer, anionic polymerizable monomer and/or nonionic polymerizable monomer as polymerizable monomer, the molecular weight is preferably 1000 as described above. 10,000 or less, particularly preferably 5 million or less, and particularly preferably 3 million or less (the same applies to the quaternary ammonium salt copolymers exemplified below).

As a polymerizable monomer having no quaternary ammonium site, a polymerizable monomer having a functional group capable of hydrogen bonding can also be used. When this polymerizable monomer is used for copolymerization and the quaternary ammonium salt copolymer thus obtained is used to flocculate red blood cells, it is easy to produce harder flocculation, and it is not easy to hinder the absorption performance of the super absorbent polymer. As the functional group capable of hydrogen bonding, for example, -OH, -NH2, -CHO, -COOH, -HF, -SH, etc. can be cited. Examples of polymerizable monomers having functional groups capable of hydrogen bonding include hydroxyethyl methacrylate, vinyl alcohol, acrylamide, dimethylacrylamide, ethylene glycol, propylene glycol, and ethylene glycol. Alcohol monomethacrylate, ethylene glycol Monoacrylate, hydroxyethyl acrylate, etc. In particular, hydroxyethyl methacrylate, 2-hydroxyethyl methacrylate, hydroxyethyl acrylate, dimethylacrylamide, etc., which have strong hydrogen bonds, make the quaternary ammonium salt polymer adsorbed on red blood cells Stabilization is therefore better. These polymerizable monomers can be used individually by 1 type or in combination of 2 or more types.

As a polymerizable monomer having no quaternary ammonium moiety, a polymerizable monomer having a functional group capable of hydrophobic interaction can also be used. By using this polymerizable monomer for copolymerization, the same advantageous effect as the above-mentioned case of using a polymerizable monomer having a functional group capable of hydrogen bonding is achieved, that is, a harder flocculation that easily produces red blood cells The effect. Examples of the functional group capable of hydrophobic interaction include alkyl groups such as methyl, ethyl, and butyl, phenyl, alkylnaphthyl, and fluorinated alkyl groups. Examples of polymerizable monomers having functional groups capable of hydrophobic interactions include methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl acrylate, propyl methacrylate, and propyl acrylate , Butyl methacrylate, butyl acrylate, styrene, etc. 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, make the quaternary The ammonium salt polymer stabilizes the adsorption state of red blood cells and is therefore preferred. These polymerizable monomers can be used individually by 1 type or in combination of 2 or more types.

In the quaternary ammonium salt copolymer, the molar ratio of the polymerizable monomer with quaternary ammonium site and the polymerizable monomer without quaternary ammonium site is better, so that the quaternary ammonium salt copolymer makes the red blood cells sufficiently The method of flocculation is adjusted appropriately. Alternatively, it is preferably adjusted so that the streaming potential of the quaternary ammonium salt copolymer becomes the above-mentioned value. Or, it is preferable to adjust so that the IOB of the quaternary ammonium salt copolymer becomes the above-mentioned value. In particular, the molar ratio of the polymerizable monomer having a quaternary ammonium site in the quaternary ammonium salt copolymer is preferably 10 mol% or more, more preferably 22 mol% or more, and more preferably 32 mol% or more , And more preferably 38 mol% or more. Moreover, it is preferably 100 mol% or less, and more preferably It is 80 mol% or less, more preferably 65 mol% or less, and still more preferably 56 mol% or less. Specifically, the molar ratio of the polymerizable monomer having a quaternary ammonium site is preferably 10 mol% or more and 100 mol% or less, more preferably 22 mol% or more and 80 mol% or less, and more Preferably it is 32 mol% or more and 65 mol% or less, 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, it is possible to use a condensate containing one or more of the above-mentioned monomers having quaternary ammonium sites and condense them The polycondensate obtained by polymerization. Specific examples include dicyandiamide/diethylene triamine polycondensate, dimethylamine/epichlorohydrin polycondensate, and the like.

The above-mentioned quaternary ammonium salt homopolymer and quaternary ammonium salt copolymer can be obtained by a homopolymerization method or a copolymerization method of a vinyl-based polymerizable monomer. As the polymerization method, for example, radical polymerization, living radical polymerization, living cationic polymerization, living anionic polymerization, coordination polymerization, ring-opening polymerization, polycondensation, etc. can be used. The polymerization conditions are not particularly limited, as long as the conditions are appropriately selected to obtain a quaternary ammonium salt polymer having the target molecular weight, streaming potential, and/or IOB value.

The cationic polymer described in detail above is an example of the above-mentioned "preferable blood flocculant 43", and its effects can be referred to Examples 1 to 45 of Japanese Patent Application No. 2015-239286.

Furthermore, as the blood flocculant 43 included in the absorber 4, as described above, in addition to polycations (cationic polymers), a third component, such as solvents, plasticizers, fragrances, antibacterial, and other The form of the composition (blood flocculant composition) such as odorant and skin care agent is given. In addition, components other than the cationic polymer that may be contained in the blood flocculant 43 may be mixed with one kind or two or more kinds. As the solvent, water, a water-soluble organic solvent such as a saturated aliphatic monohydric alcohol with 1 or 4 carbon atoms, or a mixed solvent of the water-soluble organic solvent and water, or the like can be used. As the plasticizer, glycerin, polyethylene glycol, propylene glycol, ethylene glycol, 1,3-butanediol, etc. can be used. As the spice, the spice and plant which have a fragrance like green herbs described in Japanese Patent No. 4776407 can be used. Extracts of natural substances, citrus extracts, etc. As an antibacterial and deodorant agent, the antibacterial metal-containing mineral such as cancrinite described in Japanese Patent No. 4526271, and the polymerizable monomer having a phenyl group described in Japanese Patent No. 4587928 can be used. Polymerized porous polymer, quaternary ammonium salt described in Japanese Patent No. 4651392, activated carbon, clay minerals, etc. As the skin care agent, plant extracts, collagen, natural moisturizing ingredients, moisturizing agents, keratin softeners, anti-inflammatory agents, etc., described in Japanese Patent No. 4084278 can be used.

The ratio of the cationic polymer in the blood flocculant composition is preferably 1% by mass or more, more preferably 3% by mass or more, and more preferably 5% by mass or more. Furthermore, it is preferably 50% by mass or less, more preferably 30% by mass or less, and more preferably 10% by mass or less. For example, the ratio of the cationic polymer is preferably 1% by mass or more and 50% by mass or less, more preferably 3% by mass or more and 30% by mass or less, and more preferably 5% by mass or more and 10% by mass or less. By setting the ratio of the cationic polymer to the blood flocculant composition within this range, an effective amount of cationic polymer can be provided to the absorbent article.

The amount of blood flocculant 43 contained in the absorbent sheet constituting the absorber 4 is preferably 0.1 g/m ² or more, more preferably 0.5 g/m ² or more, and more preferably 1.5 g/m ² or more. Furthermore, it is preferably 25 g/m ² or less, more preferably 15 g/m ² or less, and more preferably 10 g/m ² or less. For example, the amount of blood flocculant 43 is preferably 0.1 g/m ² or more and 25 g/m ² or less, more preferably 0.5 g/m ² or more and 15 g/m ² or less, more preferably 1.5 g/m ² or more and 10g/m ² or less. By applying the blood flocculant 43 in this range, the red blood cells in the excreted menstrual blood can be effectively flocculated. Furthermore, when the blood flocculant 43 is applied to both of the following main body absorbent sheet 401 and the central absorbent sheet 402, for example, when applied to two or more places, the above amount is applied to The sum of blood flocculant 43 in each part. Furthermore, it is particularly preferable that the blood flocculant 43 is a cationic polymer and the amount of the cationic polymer contained in the absorbent sheet is in the above-mentioned range.

In the sanitary napkin 1, the absorber 4 has a multilayer structure formed of an absorbent sheet as shown in Figs. 3 and 4. Here, the multilayer structure formed as described above may be formed by stacking a plurality of absorbent sheets, may be formed by folding one absorbent sheet, or may be formed by combining these absorbent sheets. In the sanitary napkin 1, the absorbent body 4, as shown in Figs. 3 and 4, includes a central absorptive sheet formed of an absorptive sheet with an excretory portion opposed to the wearer’s excretory portion when worn. 402, and a main absorbent sheet 401 covering the central absorbent sheet 402. That is, the absorbent body 4 of the sanitary napkin 1 has a multilayer structure formed by a main body absorbent sheet 401 and a central absorbent sheet 402, and a middle-high part 403 is formed at the part B facing the excretion part. The multi-layer structure of the absorbent body 4 of the sanitary napkin 1 has a structure in which a central absorbent sheet 402 is enclosed within the folded structure of a body absorbent sheet 401, and the central absorbent sheet 402 is arranged in the middle and high part 403 .

Preferably, in the sanitary napkin 1, as shown in FIGS. 3 and 4, the length (width) of the transverse Y of the main body absorbent sheet 401 is longer than that of the sanitary napkin 1, and includes one sheet to absorb the main body The two sides of the sexual sheet 401 along the longitudinal direction X are folded back to the back sheet 3 side to form a double-layer structure, and the two sides along the longitudinal direction X are overlapped at the center of the transverse direction Y to form the outer shape of the absorbent body 4 . In this way, the main body absorbent sheet 401 forming the two-layer structure has a front side absorbent sheet 401a on the front sheet 2 side and a back side absorbent sheet 401b on the back sheet 3 side. The central absorbent sheet 402 includes one 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 transverse direction Y. When the central absorbent sheet 402 is made into a three-layer structure, the central absorbent sheet 402 is bent at the second bending line counted from the free end of the transverse direction Y among the two bending lines that cross the longitudinal direction X Fold to the side of the back sheet 3, and then bend it to the side of the front sheet 2 with the first bending line counting from the free end of the transverse direction Y, and spirally arrange the free end of the transverse direction Y inside the three-layer structure状folded. The central absorbent sheet 402 formed into a three-layered structure in three folds in a spiral shape has a front absorbent sheet 401a and an upper absorbent sheet 402a and a back absorbent sheet. The lower absorbent sheet 402b on the 401b side, and the intermediate absorbent sheet 402c between the sheets 402a and 402b. The mid-high part 403 is a sheet with a three-layer structure including an upper absorbent sheet 402a, a middle absorbent sheet 402c, and a lower absorbent sheet 402b, sandwiched between the front absorbent sheet 401a and the back absorbent sheet 401b is formed. The middle-high portion 403 is formed only in the excretion portion facing portion B, and is not formed in the front portion A and the rear portion C. As shown in Fig. 4, the number of laminated sheets of the absorbent sheet constituting the absorbent body 4 around the middle-high part 403 is two, compared to the number of laminated sheets of the absorbent sheet constituting the absorbent body 4 of the middle-high part 403 There are 5 sheets, and the number of laminated sheets is large, which becomes the thicker part. Therefore, the middle-high part 403 becomes a protruding part which protrudes toward the surface sheet 2 side (the skin facing surface side of the sanitary napkin 1) in the excretion part opposing part B.

The thickness of each absorbent sheet is preferably 0.1 mm or more, more preferably 0.3 mm or more, more preferably 2 mm or less, and particularly preferably 1.5 mm or less. More specifically, in terms of obtaining an absorbent article that has sufficient liquid diffusibility and liquid retention properties, and has a good wearing feeling, it is preferably 0.1 mm or more and 2 mm or less, and particularly preferably 0.3 mm or more and 1.5 mm or less.

The thickness of the middle height portion 403 of the absorber 4 is preferably 0.7 mm or more, more preferably 1 mm or more, more preferably 5 mm or less, further preferably 4 mm or less, more specifically, preferably 0.7 mm or more and 5 mm or less, more preferably 1 mm or more and 4 mm or less. By setting the thickness of the middle-high portion 403 in such a range, it is easy to achieve both a good wearing feeling and a high absorption performance of the excretion-facing portion B formed with the middle-high portion 403 at the same time. Moreover, when an absorbent article like the sanitary napkin 1 of this embodiment is equipped with a wing part, it is easy to suppress the wrinkle of an absorber in the part opposing the excretion part at the time of wearing. In addition, the thickness of the portion other than the high portion 403 in the absorbent body is preferably 0.3 mm or more, more preferably 0.5 mm or more, more preferably 3 mm or less, and still more preferably 2.5 mm or less, more specifically, more It is preferably 0.3 mm or more and 3 mm or less, and more preferably 0.5 mm or more and 2.5 mm or less. In terms of higher absorption performance and improved action against the wearer From the viewpoint of followability, this range is preferable. In addition, the thickness of the absorber and the absorbent sheet was measured by the following method.

<Method for measuring thickness of absorbent sheet and absorbent body>

Place the absorbent sheet or absorbent body as the object to be measured in a horizontal place without wrinkles or bending, and measure the thickness under a load of 5 cN/cm ² . The thickness measurement in the present invention uses a thickness gauge PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.). At this time, arrange a circular or square plate (acrylic plate with a thickness of about 5mm) between the front end of the thickness gauge and the measurement part of the object to be measured, and adjust the plate so that the load becomes 5cN/cm ² size.

In the sanitary napkin 1, as shown in FIG. 5, the blood flocculant 43 is more present in the polymer-rich area PT than in the pulp-rich area FT. Here, the term "more present" refers to comparing the mass of blood flocculant 43 per unit area existing in each of the regions FT and PT, that is, the basis of the blood flocculant 43 in each of the regions FT and PT. In severe cases, the basis weight of the blood flocculant 43 in a region is relatively large. Preferably, in the sanitary napkin 1, in the portion where the pulp-rich area FT is placed on the opposite side of the skin and used, the blood flocculant 43 is present in the polymer-rich area PT more than Area FT of pulp. Furthermore, in the portion where the pulp-rich area FT is arranged on the non-skin facing surface side and used, the blood flocculant 43 is more present in the polymer-rich area PT than in the pulp-rich area FT. Here, when the absorber 4 has a multilayer structure formed of an absorbent sheet like the sanitary napkin 1, the blood flocculant 43 may not be arranged on all the absorbent sheets forming the multilayer structure. In the sanitary napkin 1, as shown in FIG. 4, blood is placed on the central absorbent sheet 402 that forms a three-layer structure including an upper absorbent sheet 402a, an intermediate absorbent sheet 402c, and a lower absorbent sheet 402b. Flocculant 43. As described above, the central absorbent sheet 402 has a three-layer structure with three folds in a roll shape, so the upper absorbent sheet 402a and the middle absorbent The sheet 402c is used by arranging the pulp-rich area FT on the side facing the skin, and the lower absorbent sheet 402b is using the pulp-rich area FT on the non-skin facing surface. Therefore, in the middle and high portion 403, when viewed from the skin contact surface side, the front side absorbent sheet 401a, the upper side absorbent sheet 402a, and the middle absorbent sheet 402c are all arranged in this order with pulp-rich areas FT and The polymer-rich area PT, and when viewed from the skin contact surface, the lower absorbent sheet 402b and the back side absorbent sheet 401b are arranged in sequence with polymer-rich areas PT and pulp-rich areas FT. In addition, in the upper absorbent sheet 402a and the middle absorbent sheet 402c where the pulp-rich area FT is arranged on the opposite side of the skin and the upper absorbent sheet 402a and the intermediate absorbent sheet 402c are used, the blood flocculant 43 is present in the polymer-rich area PT and rich The area FT containing pulp is more present in the polymer-rich area PT than the pulp-rich area FT. Furthermore, when the pulp-rich area FT is arranged on the non-skin facing surface side, in other words, the polymer-rich area PT is arranged on the skin facing surface side and used in the lower absorbent sheet 402b, blood The flocculant 43 is present in the polymer-rich area PT and the pulp-rich area FT, and the amount is more in the polymer-rich area PT than the pulp-rich area FT. Furthermore, the front side absorbent sheet 401a closest to the front side sheet 2 is used by arranging the pulp-rich area FT on the skin facing side, but the blood flocculant 43 is not provided. In addition, the backside absorbent sheet 401b closest to the backside sheet 3 is used by disposing the pulp-rich region FT on the non-skin facing surface side, but the blood flocculant 43 is not disposed.

In the sanitary napkin 1, as shown in FIG. 4, blood is placed on the central absorbent sheet 402 that forms a three-layer structure including an upper absorbent sheet 402a, an intermediate absorbent sheet 402c, and a lower absorbent sheet 402b. Flocculant 43. In addition, the blood flocculant 43 is not arranged in the main body absorbent sheet 401 forming the two-layer structure including the front side absorbent sheet 401a and the back side absorbent sheet 401b. Therefore, in the sanitary napkin 1, the basis weight of the blood flocculant 43 of the excretion facing part B is greater than the basis weight of the blood flocculant 43 of the peripheral part of the excretion facing part B.

Whether or not the blood flocculant 43 is provided is judged as follows.

Using the energy dispersive X-ray analyzer (EDX) attached to the scanning electron microscope (SEM), the super absorbent polymer 41 of the absorber 4, the pulp 42 of the absorber 4, and the absorber The blood flocculant 43 possessed by 4 carries out elemental analysis respectively. Secondly, use carbon double-sided tape to attach the sample piece to be judged whether it is equipped with blood flocculant 43 to the aluminum sample table, apply platinum/vanadium coating as necessary, and then use it while magnifying it by SEM observation EDX (Elemental Analysis Device) confirms the presence or absence of elements of the blood flocculant 43. The measurement is performed under an acceleration voltage of 15kV~40kV.

In addition, whether the blood flocculant 43 is present in the polymer-rich area PT more than the pulp-rich area FT is semi-quantitatively judged as follows.

Use carbon double-sided tape to affix the sample sheet containing the absorbent sheet with polymer-rich area PT and pulp-rich area FT, and containing blood flocculant 43, to the aluminum sample table, as required Platinum/vanadium was coated, and then magnified by SEM observation, while using EDX (Elemental Analysis Device) to perform elemental mapping of superabsorbent polymer 41, elemental mapping of pulp 42 and elemental mapping of blood flocculant 43. The measurement is performed under an acceleration voltage of 15kV~40kV. Furthermore, the obtained element distribution maps are compared. When the element mapping of the blood flocculant 43 is more similar to the element mapping of the pulp 42 than that of the superabsorbent polymer 41, it is determined that the blood flocculant 43 is rich The polymer-containing region PT is more present than the pulp-rich region FT.

In addition, for the absorbent sheet in which the blood flocculant 43 is present in the polymer-rich area PT more than the pulp-rich area FT, as long as the absorbent sheet is manufactured in the step, the polymer-rich area PT is selected It can be made by containing blood flocculant 43. For example, the absorbent sheet becomes a pulp-rich layer that is a pulp-rich area FT and a polymer-rich In the case of the structure of the polymer-rich layer in the material area PT, it is only necessary to make each layer separately and make the polymer-rich layer contain the blood flocculant 43 before overlapping with the pulp-rich layer.

For example, the case of the absorbent sheet described in Japanese Patent No. 2963647 will be described. Super absorbent polymer is spread on the wet fiber web produced by wet papermaking of water slurry containing at least hydrophilic fiber and hot-melt adhesive fiber or paper strength enhancer, and the super absorbent polymer enters The superabsorbent polymer-rich layer between the fibers (corresponding to the polymer-rich region PT) is superimposed and integrated with a fiber assembly containing hydrophilic fibers and hot-melt adhesive fibers or paper strength enhancers. Drying is performed to produce an absorbent sheet, whereby the stacked fiber assembly becomes a pulp-rich layer (corresponding to the pulp-rich region FT). The superabsorbent polymer-rich layer that is overlapped is preliminarily contained in blood flocculant, or the absorbent sheet is manufactured by spraying or applying flocculant to the polymer-rich layer that is overlapped in the absorbent sheet manufacturing step. Therefore, the amount of blood flocculant in the superabsorbent polymer-rich layer can be more than that in the pulp-rich layer.

Furthermore, the layer on which the superabsorbent polymer is dispersed is not limited to a wet web, and can also be paper and non-woven fabric produced by fiber accumulation of pulp or papermaking and drying. From the viewpoint that the superabsorbent polymer easily enters between the fibers, it is preferably a crepe-treated fluffy paper or hot-air nonwoven fabric, etc., as the superabsorbent polymer and the fiber rich in the superabsorbent polymer layer, And the bonding means of high-absorbent polymer layer and pulp-rich layer, hot melt or water-soluble adhesive can also be used. It is also possible to further pile or blow the hydrophilic fibers on the super absorbent polymer-rich layer to form a pulp-rich layer. In addition, as a coating method of the flocculant, the flocculant may be sprayed or applied to the pulp-rich layer side after the absorbent sheet is manufactured.

In addition, in the sanitary napkin 1, in the polymer-rich area PT, as shown in FIG. 5, the blood flocculant 43 is concentrated and present around the super absorbent polymer 41. That is, in the absorbent body 4, compare the position with the farthest distance between the super absorbent polymers 41 and 41 and at least one of the super absorbent polymers 41 In the case of the vicinity of those, the blood flocculant 43 is mostly present in the vicinity of the super absorbent polymer 41. In addition, at least two absorbent sheets adjacent to each other in the thickness direction have a portion where the blood flocculant 43 does not overlap. In the sanitary napkin 1, as described above, a blood flocculant is disposed on the central absorbent sheet 402 that forms a three-layer structure including the upper absorbent sheet 402a, the middle absorbent sheet 402c, and the lower absorbent sheet 402b. 43. Furthermore, as shown in FIG. 4, in the upper absorbent sheet 402a and the intermediate absorbent sheet 402c adjacent in the thickness direction, the superabsorbent polymer 41 and the blood flocculant 43 are randomly arranged, and there is blood flocculation. The part where agent 43 does not overlap. Furthermore, in the middle absorbent sheet 402c and the lower absorbent sheet 402b adjacent in the thickness direction, the superabsorbent polymer 41 and the blood flocculant 43 are randomly arranged, and the blood flocculant 43 does not overlap. section.

In addition, in the sanitary napkin 1, as shown in FIGS. 1 to 4, the absorbent body 4 is provided with a longitudinal slit 44 extending in the longitudinal direction X in the excretion portion facing portion B. With the longitudinal slit 44, the menstrual blood reaching the absorbent body 4 is easily diffused in the longitudinal direction X, and also easily penetrates in the thickness direction of the absorbent body 4. The sanitary napkin 1 has a plurality of longitudinal slits 44, and each slit 44 is arranged in parallel along the longitudinal direction X. In the sanitary napkin 1, the longitudinal slits 44 extending in the longitudinal direction X have slit regions 44S formed in a state of being dispersed in both the longitudinal direction X and the lateral direction Y. As shown in FIG. 2, the slit area 44S in which a plurality of longitudinal slits 44 are arranged not only extends over the excretion portion facing portion B, but also extends over a portion of the front portion A and a portion of the rear portion C. That is, the longitudinal slit 44 exists at least in the excretion part opposing part B, and the area containing the slit 44 located in this excretion part opposing part B is called the slit area 44S.

In the sanitary napkin 1, the longitudinal slit 44 is preferably an absorbent sheet that penetrates the most skin-facing surface containing the blood flocculant 43. In the sanitary napkin 1, the absorbent sheet on the side closest to the skin-facing surface containing the blood flocculant 43 refers to the upper absorbent sheet 402a. As shown in FIGS. 3 and 4, when the absorbent body 4 is cross-sectionally viewed along the transverse direction Y, the longitudinal slit 44 only needs to penetrate the upper absorbent sheet 402a, but the The absorber 4 penetrates the entire layer in its thickness direction. Preferably, in the sanitary napkin 1, the longitudinal slit 44 penetrates in the excretion portion facing portion B to constitute the five-piece laminated sheet constituting the middle-high portion 403, that is, the front side absorbent sheet 401a and the upper side absorbent sheet 402a , All sheets of the middle absorbent sheet 402c, the lower absorbent sheet 402b, and the back absorbent sheet 401b. Moreover, in the sanitary napkin 1, the longitudinal slit 44 penetrates the front side absorbent sheet 401a and the back side absorbent sheet 401b in a part of the front part A and a part of the rear part C.

In the sanitary napkin 1, the arrangement of the longitudinal slits 44 of the slit area 44S is not particularly limited as long as the longitudinal slits 44 are dispersed in the longitudinal X and transverse Y directions, but it is preferably the central slit. In the area 44S1, four or more slits are scattered. The so-called central slit area 44S1 refers to an area overlapping with the central absorbent sheet 402 in the slit area 44S.

In addition, in the central slit region 44S1, the slit rows are preferably formed along the longitudinal direction X in 3 rows or more, more preferably 4 rows or more, and still more preferably 5 rows or more. In addition, the number of vertical slits 44 that are separated in the lateral direction Y included in each slit row is preferably two or more, more preferably three or more.

Preferably, in the longitudinal direction X of the slit area 44S, in addition to the slit rows contained in the central slit area 44S1, there are 1 row or more of slits before and after the longitudinal direction X of the central slit area 44S1. Sew.

The width W44 (refer to FIG. 2) of each longitudinal slit 44 when viewed from above is preferably 0.1 mm or more, more preferably 0.2 mm or more, more preferably 1 mm or less, further preferably 0.8 mm or less, and more preferably It is 0.1 mm or more and 1 mm or less, more preferably 0.3 mm or more and 0.8 mm or less.

The length L44 of the longitudinal slit 44 in the plan view of the slit region 44S (refer to FIG. 2) is preferably 10 mm or more, more preferably 15 mm or more, more preferably 35 mm or less, and more preferably 25 mm or less, and more Preferably it is 10mm or more and 35mm or less, more preferably 15mm or more and 25mm mm below.

In addition, the interval D44 (refer to FIG. 2) between the longitudinal slits 44 adjacent to each other in the transverse direction Y of the slit region 44S is preferably 3 mm or more, more preferably 7 mm or more, more preferably 20 mm or less, and more It is preferably 15 mm or less, more preferably 3 mm or more and 20 mm or less, and more preferably 7 mm or more and 15 mm or less.

The formation materials of the respective constituent members of the sanitary napkin 1 of the above-mentioned present embodiment will be described.

As the top sheet 2 and the back sheet 3, various sheets and the like previously used for absorbent articles such as menstrual sanitary napkins can be used without particular limitation. For example, as the top sheet 2, a single-layer or multilayer structure of non-woven fabric or perforated film can be used. As the back sheet 3, a moisture-permeable resin film or the like can be used.

As the second sheet 5, it is preferable to include a hydrophilic nonwoven fabric or a hydrophilic fiber assembly. Examples of non-woven fabrics include hot-air non-woven fabrics, dot-bonded non-woven fabrics, resin-bonded non-woven fabrics, spunlace non-woven fabrics, and air-spun non-woven fabrics.

Regarding the second sheet 5, the basis weight thereof is preferably 10 g/m ² or more and 50 g/m ² or less, and more preferably 15 g/m ² or more and 40 g/m ² or less. Moreover, as for the second sheet material 5, the thickness thereof is preferably 0.1 mm or more and 5 mm or less.

In the sanitary napkin 1, an adhesive is preferably applied between the front sheet 2 and the second sheet 5, between the second sheet 5 and the absorber 4, and between the absorber 4 and the back sheet 3 be fixed. The adhering agent can be applied using a well-known mechanism, for example, a slit coating gun, a spiral spray gun, a spray gun, or a spot gun. In the sanitary napkin 1, a spiral spray gun is preferably used for spiral coating. As the adhesive to be applied, for example, a hot melt adhesive is preferably used. The coating amount of the hot melt adhesive is preferably 1.5 g/m ² or more and 10 g/m ² or less.

In addition, when the longitudinal slit 44 is formed in the absorbent body 4 like the sanitary napkin 1, it only needs to be cut by a well-known The mechanism may partially cut the laminated body of the absorbent sheet. For example, the following cutting device can be used, which is provided on the peripheral surface of the roll and is formed in a plurality of circumferentially extending in the circumferential and axial directions of the roll. The cutting roller of the cutting blade and the anvil roller supporting the blade of the cutting roller.

The effect and inference mechanism of the above-mentioned sanitary napkin 1 are explained.

In the sanitary napkin 1, as shown in FIG. 5, the absorbent body 4 including the absorbent sheet has relatively high polymer-rich areas PT and the super absorbent polymer 41 when viewed in cross section. There are relatively few pulp-rich areas FT, and the amount of blood flocculant 43 in the polymer-rich areas PT is more than that in the pulp-rich areas FT. Therefore, it is believed that in the use of sanitary napkin 1, menstrual blood is rapidly absorbed in the pulp-rich area FT, and the blood can be absorbed at a fixed point without spreading the blood. Moreover, with the blood flocculant 43 in the polymer-rich area PT, menstrual blood Separate into erythrocytes and plasma, whereby plasma with lower viscosity than menstrual blood is quickly absorbed by the superabsorbent polymer 41, and menstrual blood can be absorbed effectively, and it is not easy to return fluid. In particular, in the sanitary napkin 1, the front side absorbent sheet 401a formed of the body absorbent sheet 401 containing the blood flocculant 43 is used by arranging the pulp-rich region FT on the side facing the skin. Therefore, menstrual blood is first absorbed in the pulp-rich area FT on the opposite side of the skin, and is quickly absorbed by the way that menstrual blood leaves from the skin side, and can be absorbed at a specific point without spreading blood. After that, the menstrual blood is transferred to the polymer-rich area PT to produce blood cell flocculation and plasma separation. The plasma components are absorbed into the superabsorbent polymer 41, so it is not easy to cause discomfort to the wearer, and it is not easy to return fluid.

Moreover, in the sanitary napkin 1, as shown in FIGS. 3 and 4, the absorber 4 has a multilayer structure formed of an absorbent sheet. Therefore, a space is easily formed between each of the upper absorbent sheet 402a, the intermediate absorbent sheet 402c, and the lower absorbent sheet 402b where the blood flocculant 43 is arranged, and the upper absorbent sheet is formed by this space. The blood cell flocculation formed in 402a is not easy to migrate to the middle absorbent sheet 402c and the lower absorbent sheet 402b on the 3 side of the back sheet, the closer to the back sheet On the third side, the more easily the blood plasma increases, the plasma easily diffuses in the thickness direction, the absorption rate of blood absorbing becomes faster, and the plasma components are not easy to return to the skin side.

In addition, in the sanitary napkin 1, in the polymer-rich area PT, the blood flocculant 43 is concentrated around the super absorbent polymer 41 as shown in FIG. 5. Therefore, the plasma components separated from the blood cell components quickly contact the superabsorbent polymer 41. Furthermore, as shown in FIG. 4, in the upper absorbent sheet 402a and the intermediate absorbent sheet 402c adjacent in the thickness direction, the superabsorbent polymer 41 and the blood flocculant 43 are randomly arranged, and blood is present. The part where the flocculant 43 does not overlap. Furthermore, in the middle absorbent sheet 402c and the lower absorbent sheet 402b adjacent in the thickness direction, the super absorbent polymer 41 and the blood flocculant 43 are randomly arranged, and the presence of the blood flocculant 43 does not overlap The part. Therefore, the positions of the blood cell flocculations formed inside each of the upper absorbent sheet 402a, the middle absorbent sheet 402c, and the lower absorbent sheet 402b are dispersed, and menstrual blood can be absorbed more effectively, and liquid return is less likely to occur.

Moreover, in the sanitary napkin 1, as shown in FIGS. 1-3, the absorber 4 has the longitudinal slit 44 in the part B facing the excretion part. Therefore, the menstrual blood can easily move along the longitudinal direction X and further prevent the side leakage of menstrual blood. Furthermore, a space is formed in the portion of the absorbent body 4 where the longitudinal slit 44 is provided, so that menstrual blood from the front sheet 2 is easily introduced, and the menstrual blood easily penetrates in the thickness direction of the absorbent body 4, and the menstrual blood in the cross section of the longitudinal slit 44 It easily penetrates into the surface direction of the absorbent body 4. Therefore, menstrual blood is easy to quickly contact the blood flocculant 43 present in the absorbent body 4, and the probability of contact becomes higher. Therefore, it is believed that plasma components separated from menstrual blood are easily absorbed by the superabsorbent polymer 41, which is beneficial to suppress liquid return.

In addition, the cut portion of the longitudinal slit 44 is often slightly compressed during the cutting process, and therefore the density becomes higher than that of the portion where the longitudinal slit 44 is not provided, and the absorption speed is further improved. In addition, since the absorber 4 is completely penetrated by the longitudinal slit 44, the liquid reaching the absorber 4 can easily reach the non-skin facing surface side of the absorber 4, and the absorption by the absorber 4 can be efficiently used. It is advantageous in terms of high absorption capacity and suppression of liquid return.

Moreover, in the sanitary napkin 1, as shown in FIGS. 1 and 4, the basis weight of the blood flocculant 43 of the excretion-facing part B is greater than the basis weight of the blood flocculant 43 of the peripheral part of the excretion-facing part B. Therefore, the menstrual blood can be effectively absorbed in the excretion-facing portion B, and the peripheral portion of the excretion-facing portion B can maintain flexibility and improve the feeling of use.

Moreover, in the sanitary napkin 1, as shown in FIGS. 1 and 3, a second sheet 5 including a non-woven fabric is arranged between the top sheet 2 and the absorber 4. Therefore, the blood cell flocculation formed in the absorbent body 4 is covered by the second sheet 5, preventing it from returning to the surface to produce a sticky feeling, and it is not easy to be recognized from the side of the front sheet 2, thereby preventing discomfort to the user.

As mentioned above, the present invention has been described based on its preferred embodiments, but the absorbent article of the present invention is not limited to the sanitary napkin 1 of the above-mentioned embodiment at all, and can be changed as appropriate.

For example, in the above-mentioned sanitary napkin 1, the absorbent body 4 has a structure including an absorbent sheet, but it can also be replaced by a type of absorbent body structure in which hydrophilic fibers and/or superabsorbent polymers are stacked, and In order to have different blending ratios of hydrophilic fibers and superabsorbent polymers on the skin-facing surface side and the non-skin-facing surface side, it has a composition of polymer-rich regions and hydrophilic fibers-rich regions. Furthermore, it can also be set as the structure which covered the whole structure of the absorbent body of the above-mentioned fiber accumulation type with a hydrophilic core-covering material.

In addition, in the sanitary napkin 1, as shown in FIG. 4, the central absorbent sheet 402 is arranged in a three-layer structure including an upper absorbent sheet 402a, an intermediate absorbent sheet 402c, and a lower absorbent sheet 402b. There is a blood flocculant 43, but as shown in FIG. 6, the blood flocculant 43 may not be placed on the central absorbent sheet 402, and a double-sided absorbent sheet 401a and a back absorbent sheet 401b may be formed. The body absorbent sheet 401 with a layer structure is provided with a blood flocculant 43. In the absorbent body 4 shown in FIG. 6, the main body absorbent sheet 401 becomes the two sides along the longitudinal direction X as described above. The double-layer structure of the part folded back, so the front side absorbent sheet 401a on the front sheet 2 side is used by arranging the pulp-rich area FT on the skin facing side, and the back side absorbent sheet on the back sheet 3 side 401b is used by disposing the pulp-rich area FT on the non-skin facing side. Furthermore, in the front side absorbent sheet 401a used by arranging the pulp-rich area FT on the opposite side of the skin, the blood flocculant 43 is present in the polymer-rich area PT and the pulp-rich area FT. And there is more PT in the polymer-rich area than in the pulp-rich area FT. In addition, in the back side absorbent sheet 401b used when the pulp-rich area FT is arranged on the non-skin facing side, in other words the polymer-rich area PT is used on the skin facing side, the blood The flocculant 43 is present in the polymer-rich area PT and the pulp-rich area FT, and the amount is more in the polymer-rich area PT than the pulp-rich area FT. According to the absorber 4 shown in FIG. 6, in the front side absorbent sheet 401a closest to the front sheet 2 side, the blood flocculant 43 is more present in the polymer-rich area PT than in the pulp-rich area Therefore, even if FT is repeatedly excreted in the same absorption part, it is quickly absorbed by the super absorbent polymer, thereby exerting the effect of preventing liquid diffusion.

In addition, as shown in FIG. 7, the blood flocculant 43 may be placed on the central absorbent sheet 402 that has a three-layer structure including an upper absorbent sheet 402a, a middle absorbent sheet 402c, and a lower absorbent sheet 402b. , The blood flocculant 43 is also arranged on the main body absorbent sheet 401. Regarding the absorber 4 shown in FIG. 7, the front side absorbent sheet 401a formed of the main body absorbent sheet 401 is used by arranging the pulp-rich region FT on the side facing the skin. The main body absorbent sheet 401 The formed back side absorbent sheet 401b is used by arranging the pulp-rich region FT on the non-skin facing surface side. Furthermore, in the front side absorbent sheet 401a used by arranging the pulp-rich area FT on the opposite side of the skin, the blood flocculant 43 is present in the polymer-rich area PT and the pulp-rich area FT. And there is more PT in polymer-rich areas than in pulp-rich areas FT. In addition, in the back side absorbent sheet 401b used when the pulp-rich area FT is arranged on the non-skin facing side, in other words the polymer-rich area PT is used on the skin facing side, the blood The flocculant 43 is present in the polymer-rich area PT and the pulp-rich area FT, and the amount is more in the polymer-rich area PT than the pulp-rich area FT. In addition, the upper absorbent sheet 402a and the intermediate absorbent sheet 402c are respectively used by disposing the pulp-rich area FT on the opposite side of the skin, and the lower absorbent sheet 402b disposing the pulp-rich area FT on the non Use the skin facing the face side. In addition, in the upper absorbent sheet 402a and the middle absorbent sheet 402c where the pulp-rich area FT is arranged on the opposite side of the skin and the upper absorbent sheet 402a and the intermediate absorbent sheet 402c are used, the blood flocculant 43 is present in the polymer-rich area PT and rich The area FT containing pulp is more present in the polymer-rich area PT than the pulp-rich area FT. Furthermore, when the pulp-rich area FT is arranged on the non-skin facing surface side, in other words, the polymer-rich area PT is arranged on the skin facing surface side and used in the lower absorbent sheet 402b, blood The flocculant 43 is present in the polymer-rich area PT and the pulp-rich area FT, and the amount is more in the polymer-rich area PT than the pulp-rich area FT. According to the absorber 4 shown in Fig. 7, any of the absorptive sheets 401a, 401b, 402a, 402b, 402c has the blood flocculant 43, so the absorption rate of blood is faster.

In addition, as shown in FIGS. 4, 6 and 7, when the absorbent body 4 has a multilayer structure formed of an absorbent sheet, the blood flocculant 43 contained can be in any of the absorbent sheets 401a, 401b The same blood flocculant 43 in 402a, 402b, 402c can also be different blood flocculant 43.

In addition, as shown in FIGS. 4, 6 and 7, the absorbent sheet constituting the absorbent body 4 is formed with two layers of polymer-rich area PT and pulp-rich area FT. The polymer area PT and the pulp-rich area FT can also be formed with more than three layers.

In addition, in the sanitary napkin 1, a diffusing mechanism for diffusing menstrual blood in the longitudinal direction X is provided in the excretion portion facing portion B, but the diffusing mechanism may not be provided.

In addition, as shown in Figures 1 and 2, the plurality of slits 44 of the absorbent body 4 of the sanitary napkin 1 are slits along the longitudinal direction X, but they may also be provided along both the longitudinal direction X and the lateral direction Y. A slit extending in the oblique direction of the angle.

In addition, the absorbent article for menstrual blood absorption of the present invention may be a sanitary pad (a sheet of a vaginal secretion pad) and the like in addition to a menstrual sanitary napkin.

Regarding the embodiments of the present invention described above, the following absorbent articles are further disclosed.

<1>

An absorbent article comprising an absorber containing a superabsorbent polymer, a hydrophilic fiber and a blood flocculant, and a front sheet and a back sheet sandwiching the absorber that can absorb blood, and the absorber In a cross-sectional view, there is a polymer-rich region that has a relatively high polymer-rich region relative to the total mass of the hydrophilic fiber and the mass of the super-absorbent polymer. Where the polymer area is relatively low in the area rich in hydrophilic fibers, the amount of the blood flocculant present in the polymer-rich area is more than that in the hydrophilic fiber-rich area.

<2>

The absorbent article as described in the above <1>, wherein the absorbent system is composed of an absorbent sheet.

<3>

The absorbent article as described in the above <1> or <2>, wherein the above-mentioned hydrophilic fiber is Pulp fiber.

<4>

The absorbent article according to any one of the above <1> to <3>, wherein the blood flocculant is a cationic polymer.

<5>

The absorbent article as described in the above <4>, wherein the cationic polymer is a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer or a quaternary ammonium salt condensation polymer.

<6>

The absorbent article as described in any one of the above <1> to <5>, wherein the absorbent system is composed of an absorbent sheet and has a multilayer structure formed by stacking a plurality of the absorbent sheets.

<7>

The absorbent article according to any one of the above <1> to <6>, wherein the absorbent system is composed of an absorbent sheet, and in the polymer-rich region, the blood flocculant is concentrated in the above There is a portion where the blood flocculant does not overlap between at least two of the absorbent sheets adjacent to the super absorbent polymer in the thickness direction.

<8>

The absorbent article as described in any one of the above <1> to <7>, wherein the above-mentioned absorbent system is composed of an absorbent sheet, and when worn, it opposes the excretory part arranged opposite to the excretory part of the wearer The portion has a longitudinal slit extending in the longitudinal direction, and the longitudinal slit penetrates the absorbent sheet on the side closest to the skin-facing surface containing the blood flocculant.

<9>

The absorbent article described in any one of the above <1> to <8>, wherein the above-mentioned absorbent When the body is worn, the excretory portion opposed to the excretory portion of the wearer has a longitudinal slit extending in the longitudinal direction, and the width of the longitudinal slit is 0.1mm or more and 1mm or less, preferably 0.3mm or more and Below 0.8mm.

<10>

The absorbent article as described in the above <1> to <9>, wherein the excretion portion facing portion of the absorbent body disposed opposite to the excretion portion of the wearer when worn has a longitudinal slit extending in the longitudinal direction, and the The length of the longitudinal slit is 10 mm or more and 35 mm or less, preferably 15 mm or more and 25 mm or less.

<11>

The absorbent article described in any one of the above <1> to <10>, wherein the excretion part facing part of the wearer's excretion part is arranged opposite to the wearer's excretion part when the absorbent body is worn has a longitudinal slit extending in the longitudinal direction And the longitudinal slits are adjacent to each other in a plurality of rows in the lateral direction, and the interval between the adjacent longitudinal slits in the lateral direction is 3 mm or more and 20 mm or less, preferably 7 mm or more and 15 mm or less.

<12>

The absorbent article as described in any one of the above <1> to <11>, wherein the excretion part facing part of the wearer's excretion part is arranged opposite to the wearer's excretion part when the absorbent body is worn has a longitudinal slit extending longitudinally There are a plurality of longitudinal slits scattered in the longitudinal direction.

<13>

The absorbent article as described in any one of the above <1> to <12>, wherein the absorbent system is composed of an absorbent sheet, and the absorbent sheet includes a pair of the excretory part arranged to face the wearer when worn The central absorptive sheet at the opposite part of the excretion part and the main absorbent sheet covering the central absorptive sheet, the basis of the blood flocculant in the opposite part of the excretion part is larger than the opposite part of the excretion part Department of Zhou The basis weight of the above blood flocculant in the marginal part.

<14>

The absorbent article as described in any one of the above <1> to <13>, wherein the absorbent system is composed of an absorbent sheet, and the absorbent sheet includes an absorbent article disposed opposite to the excretion part of the wearer when worn The central absorptive sheet at the opposite part of the excretion part and the main absorbent sheet covering the central absorptive sheet are arranged, and the central absorptive sheet becomes a multilayer structure in which a plurality of the aforementioned absorptive sheets are stacked .

<15>

The absorbent article as described in any one of the above <1> to <14>, wherein the absorbent system is composed of an absorbent sheet, and the absorbent sheet includes an absorbent article disposed opposite to the excretion part of the wearer when worn The central absorbent sheet of the opposite part of the excretion part and the main absorbent sheet covering the central absorbent sheet are arranged, and the central absorbent sheet has the following part, that is, when viewed in the thickness direction, the absorbent The polymer-rich region and the hydrophilic fiber-rich region of the sheet are opposite in the thickness direction between adjacent absorbent sheets.

<16>

The absorbent article as described in any one of the above <1> to <15>, wherein the absorbent system is composed of an absorbent sheet, and the absorbent sheet includes an absorbent sheet arranged to face the excretory part of the wearer when worn The central absorbent sheet of the opposite part of the excretion part arranged and the main absorbent sheet covering the central absorbent sheet The above-mentioned central absorbent sheet has a structure in which one absorbent sheet is folded so as to have a structure of at least three layers, wherein the uppermost layer located on the side closest to the skin contact surface is adjacent to when viewed in the thickness direction In the second layer of the uppermost layer, the area rich in hydrophilic fibers and the area rich in polymer are arranged in the same thickness direction.

<17>

The absorbent article as described in any one of the above <1> to <16>, wherein the absorbent system is composed of an absorbent sheet, and the absorbent sheet includes an absorbent article disposed opposite to the excretion part of the wearer when worn The central absorbent sheet facing the excretion part and the main absorbent sheet covering the central absorbent sheet are arranged, and the blood flocculant is contained only in the central absorbent sheet.

<18>

The absorbent article as described in any one of the above <1> to <17>, wherein the absorbent system is composed of an absorbent sheet, and the absorbent sheet includes an absorbent article arranged to face the excretory part of the wearer when worn The central absorbent sheet facing the excretion part and the main absorbent sheet covering the central absorbent sheet are arranged, and the blood flocculant is contained only in the main absorbent sheet.

<19>

The absorbent article as described in any one of the above <1> to <17>, wherein the absorbent system is composed of an absorbent sheet, and the absorbent sheet includes an absorbent article arranged to face the excretory part of the wearer when worn Configuration row The central absorptive sheet facing the vent portion and the main absorptive sheet covering the central absorptive sheet, and the blood flocculant is contained in the central absorptive sheet and the main absorptive sheet.

<20>

The absorbent article described in any one of the above <1> to <19>, wherein the absorbent system is composed of an absorbent sheet, and the absorbent sheet located on the side closest to the skin contact surface is in the thickness direction During observation, the area rich in hydrophilic fibers is located on the skin abutting surface side, and the area rich in polymers is located on the non-skin abutting surface side.

<21>

The absorbent article as described in any one of the above <1> to <20>, wherein a second sheet including a non-woven fabric is arranged between the top sheet and the absorbent body, and the second sheet does not contain the above Blood flocculant.

<22>

The absorbent article according to any one of the above <1> to <21>, wherein the blood flocculant is a cationic polymer, and the molecular weight of the cationic polymer is 2,000 or more and 10 million or less, preferably 2000 or more and 5 million or less, more preferably 2000 or more and 3 million or less, and more preferably 10,000 or more and 3 million or less.

<23>

The absorbent article according to any one of the above <1> to <22>, wherein the amount of the blood flocculant is preferably 1 g/m ² or more and 20 g/m ² or less, and more preferably 3 g/m ² Above and 15 g/m ² or less, more preferably 5 g/m ² or more and 10 g/m ² or less.

<24>

The absorbent article described in any one of the above <1> to <23>, which is used to absorb blood, and the blood flocculant is a water-soluble cationic polymer, and the following water-soluble cationic polymer is applied: The water-soluble cationic polymer includes a structure having a main chain and a side chain bonded to it, and has a molecular weight of 2000 or more. The water-soluble cationic polymer is a quaternary ammonium salt having a repeating unit represented by the following formula 1. A homopolymer, or a quaternary ammonium salt copolymer having a repeating unit represented by the following formula 1 and a repeating unit represented by the following formula 2, wherein the main chain and the side chain of the water-soluble cationic polymer are at 1 Point bonding, and the side chain has a quaternary ammonium site.

[化4]

<25>

The absorbent article according to any one of the above <1> to <23>, wherein as the blood flocculant, it has a flow potential of 1500 μeq/L or more and a molecular weight of 2000 or more containing a quaternary ammonium salt homopolymer or The water-soluble cationic polymer of the quaternary ammonium salt copolymer is 1 g/m ² or more and 20 g/m ² or less.

<26>

The absorbent article according to any one of the above <1> to <25>, wherein the blood flocculant is a water-soluble cationic polymer, and the water-soluble cationic polymer is a quaternary ammonium salt homopolymer or a quaternary ammonium salt. The grade ammonium salt copolymer has a structure of a main chain and a side chain bonded to it, and the main chain and the side chain are bonded at one point.

<27>

The absorbent article according to any one of the above <1> to <25>, wherein the blood flocculant includes a water-soluble cationic polymer with a molecular weight of 2000 or more, and the inorganic value of the cationic polymer is equal to The ratio of the organic value, that is, the value of the inorganic value/organic value is 0.6 or more and 4.6 or less, and the cationic polymer is a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer, or a quaternary ammonium salt polycondensate.

<28>

The absorbent article described in any one of the above <1> to <27>, wherein the above absorbent article is a menstrual sanitary napkin.

[Example]

Hereinafter, the absorbent article of the present invention will be explained in more detail with examples. However, the scope of the present invention is not limited by this embodiment.

<Example 1>

A menstrual sanitary napkin with a basic structure similar to the menstrual sanitary napkin shown in Figs. 1 to 3 having the absorber shown in Figs. 4 and 5 was produced, and this was used as the sample of Example 1. As the front sheet, a single-layer structure of hot-air non-woven fabric sheet is used. The basis weight of the front sheet is 25 g/m ² . As the back sheet, a moisture-permeable resin film is used. As the second sheet, a dot-bonded hot-air nonwoven fabric with a basis weight of 25 g/m ² was used.

As an absorbent sheet constituting the absorbent body, it was produced in accordance with Example 2 of Japanese Patent No. 2963647. However, High Bulk Additive HBA manufactured by Weyerhauser Paper is used as the crosslinked pulp, and Aqualic CA manufactured by Nippon Shokubai Co., Ltd. is used as the super absorbent polymer. In the step of preparing the absorbent body, the blood flocculant is preliminarily contained in the fiber web dispersed with the superabsorbent polymer before being overlapped with the absorbent paper. Thereby, the amount of the blood flocculant in the polymer-rich area PT with superabsorbent polymer dispersed fiber web is more than that of the absorbent paper in the hydrophilic fiber-rich area FT. As the cationic polymer contained in the blood flocculant, the trade name Merquat 100 manufactured by Lubrizol Japan (weight average molecular weight: 150,000, IOB value 2.10, streaming potential 7488 μeq/L) was used. Moreover, like the absorber shown in FIG. 4, only the central absorbent sheet 402 forming a three-layer structure including an upper absorbent sheet 402a, an intermediate absorbent sheet 402c, and a lower absorbent sheet 402b is arranged Blood flocculant 43. That is, the blood flocculant 43 is not disposed in the main body absorbent sheet 401 forming the double-layer structure including the front side absorbent sheet 401a and the back side absorbent sheet 401b. The basis weight of the cationic polymer applied to the absorbent sheet is 1.5 g/m ² for the upper absorbent sheet 402a, the middle absorbent sheet 402c, and the lower absorbent sheet 402b. Furthermore, longitudinal slits are arranged in the absorber as shown in FIG. 1.

<Example 2>

As the cationic polymer contained in the blood flocculant, the trade name Merquat 106 manufactured by Lubrizol Japan (weight average molecular weight: 15,000, IOB value 2.10, streaming potential 7345 μeq/L) was used. The basis weight of the cationic polymer applied to the absorbent sheet is 1.5 g/m ² . Except for this, the menstrual napkin was produced in the same manner as in Example 1.

<Example 3>

The menstrual napkin was produced in the same manner as in Example 2 except that the one shown in FIG. 6 was used as the absorber. That is, as in Example 2, the brand name Merquat 106 manufactured by Lubrizol Japan was used as the cationic polymer contained in the blood flocculant. As for the absorbent system, like the absorbent body shown in FIG. 6, the blood flocculant 43 is arranged only on the main body absorbent sheet 401 forming the double-layer structure including the front side absorbent sheet 401a and the back side absorbent sheet 401b.

In addition, the blood flocculant 43 is not disposed in the central absorbent sheet 402 forming the three-layer structure including the upper absorbent sheet 402a, the middle absorbent sheet 402c, and the lower absorbent sheet 402b. The basis weight of the cationic polymer applied to the absorbent sheet is 1.5 g/m ² for the front side absorbent sheet 401a and the back side absorbent sheet 401b, respectively.

<Example 4>

The menstrual napkin was produced in the same manner as in Example 2 except that the one shown in FIG. 7 was used as the absorber. That is, as in Example 2, the brand name Merquat 106 manufactured by Lubrizol Japan was used as the cationic polymer contained in the blood flocculant. The absorbent system is like the absorbent body shown in FIG. 7, and the blood flocculant 43 is arranged in the main absorbent sheet 401 having a two-layer structure including a front side absorbent sheet 401 a and a back side absorbent sheet 401 b. In addition, the blood flocculant 43 is arranged on the central absorbent sheet 402 forming a three-layer structure including the upper absorbent sheet 402a, the middle absorbent sheet 402c, and the lower absorbent sheet 402b. The basis weight of the cationic polymer applied to the absorbent sheet is 1.5 g/m ² respectively.

<Comparative Example 1>

In the sample of Example 1, a sample of Comparative Example 1 was prepared in the same manner as in Example 1, except that the absorber was replaced with an absorber without the blood flocculant 43.

[Evaluation]

The samples of Examples 1 to 4 (menstrual sanitary napkins) and the samples of Comparative Example 1 (menstrual sanitary napkins) were respectively evaluated by the following methods for dynamic maximum absorption, static maximum absorption, dynamic diffusion area, and dynamic return. Liquid volume. The results are shown in Table 2 below.

<Dynamic maximum absorption>

The samples of the Examples and Comparative Examples were evaluated using the movable female waist models described in paragraphs [0082] and [0083] of Japanese Patent Laid-Open No. 9-187476. The samples of the embodiment and the comparative example were fixed to menstrual shorts and worn on the dynamic model of the human body.

Make the dynamic model start the walking motion, and discharge the fluid from the liquid after 1 minute from the start of the walking motion Inject 2g of simulated blood into the leak point (first time). Furthermore, 3 minutes after the end of the first liquid injection, 3 g of simulated blood was injected (second time). Furthermore, 3 minutes from the end of the second liquid injection, 2 g of simulated blood was injected (third time). The third and subsequent liquid injections were repeated injections of 2g of simulated blood 3 minutes after the liquid injection, and ended at the time point when the liquid leaked from the wings of each sample of the Examples and or Comparative Examples, and set it as the dynamic maximum absorption.

Furthermore, the simulated blood was measured using a type B viscometer (TVB-10M manufactured by Toki Sangyo Co., Ltd., measurement conditions: rotor No. 19, 30 rpm, 25° C., 60 seconds) as described in this manual. The viscosity becomes 8mPa‧s to prepare the blood cell and plasma ratio of defibrinated horse blood (manufactured by NIPPON BIO-TEST Research Institute Co., Ltd.).

<Static maximum absorption>

The samples of the Examples and Comparative Examples were placed horizontally and evaluated. On each sample of the embodiment and the comparative example, overlap an acrylic plate with an oval cylinder with an injection port with a diameter of 3 cm at the bottom, and the excretion part of the sample from the injection port (distance from the tip of the sample in the longitudinal direction is 40mm position) inject simulated blood. After injection, keep this state for 3 minutes. Next, remove the acrylic plate with the elliptical tube, place a weight on the surface of the front sheet so that the pressure becomes 18kPa, and press it for 1 minute (first time). Next, the sample after the test was superimposed on the above-mentioned acrylic plate again, and another 3 g of simulated blood was injected from the injection port 4 minutes after the first injection. The injection position of the simulated blood of the embodiment and the comparative example to each sample is set to be the same as the initial injection position of 3 g. After the second time, the same operation as the first time was repeated, and the time point when the liquid oozes out of the wing parts of each sample of the example and or the comparative example was ended, and the static maximum absorption was set.

<The dynamic diffusion area of the front sheet>

The samples of the Examples and Comparative Examples were evaluated using the movable female waist models described in paragraphs [0082] and [0083] of Japanese Patent Laid-Open No. 9-187476. Movable female After the sexual waist model wears each sample and puts on shorts, while walking at a speed of 100 steps/min, while injecting 2g of simulated blood at 3 minute intervals until it reaches 8g (the injection rate of simulated blood is 1g in 15 seconds), The movable female waist model removes the sanitary napkin, and measures the area where the simulated blood is attached to the front sheet. The measurement of the diffusion area is implemented by using NEWQUBE (ver. 4.20) manufactured by NEXUS as an image analysis device to capture images (via a CCD camera or scanner).

<Dynamic Liquid Return>

After the measurement of the above-mentioned dynamic diffusion area, 10 sheets of pre-weighed absorbent paper (length 170mm, width 70mm, The toilet paper with a basis weight of 35g/cm ² overlaps the surface of the sample, and the sample is quickly installed on the crotch of shorts and worn on the dynamic walking model. Walk for 2 minutes. After walking, stop the movement of the model, take out the absorbent paper and weigh it, and calculate the amount of liquid (g) absorbed by the absorbent paper. Each sample was measured 3 times, and the average value was used as the dynamic liquid return amount of the sample.

According to the results of Table 2, it can be seen that the menstrual sanitary napkins of Examples 1 to 4 have more dynamic maximum absorption capacity and static maximum absorption capacity than the menstrual sanitary napkins of Comparative Example 1. In addition, it can be seen that the menstrual sanitary napkins of Examples 1 to 4 have a smaller dynamic diffusion area of the front sheet and a smaller amount of dynamic liquid return than the menstrual sanitary napkins of Comparative Example 1. Therefore, it can be expected that the menstrual sanitary napkins of Examples 1 to 4 can effectively absorb blood compared with the menstrual sanitary napkins of Comparative Example 1, and it is not easy to return fluid, and does not cause blood Spot absorption is carried out diffusely.

[Industrial availability]

According to the absorbent article of the present invention, blood can be efficiently absorbed into the superabsorbent polymer, liquid is not easy to return, and blood can be absorbed at a fixed point without spreading blood.

41‧‧‧Super Absorbent Polymer

42‧‧‧Pulp

43‧‧‧blood flocculant

FT‧‧‧Areas rich in pulp

PT‧‧‧Polymer-rich area

Y‧‧‧Horizontal

Claims (25)

An absorbent article comprising an absorber containing a superabsorbent polymer, a hydrophilic fiber and a blood flocculant, and a front sheet and a back sheet sandwiching the absorber that can absorb blood, and the absorber In a cross-sectional view, there is a polymer-rich region that has a relatively high polymer-rich region relative to the total mass of the hydrophilic fiber and the mass of the super-absorbent polymer. The polymer area is relatively low in the area rich in hydrophilic fibers, the amount of the blood flocculant in the polymer-rich area is more than that in the area rich in hydrophilic fibers, and the absorbent system is composed of an absorbent sheet. The above-mentioned absorbent sheet includes a central absorbent sheet arranged at an excretory portion opposing portion arranged opposite to the excretory portion of the wearer during wearing, and a main absorbent sheet covering the central absorbent sheet, and The central absorbent sheet has a multilayer structure in which a plurality of the absorbent sheets are stacked. The absorbent article according to claim 1, wherein the hydrophilic fiber is pulp fiber. The absorbent article of claim 1, wherein the blood flocculant is a cationic polymer. The absorbent article of claim 3, wherein the cationic polymer is a quaternary ammonium salt homopolymer Material, quaternary ammonium salt copolymer or quaternary ammonium salt condensation polymer. The absorbent article of claim 1, wherein the absorbent system is located in the polymer-rich region, and the blood flocculant is concentrated in the periphery of the super absorbent polymer, and at least two adjacent sheets in the thickness direction Between the absorbent sheets, there is a portion where the blood flocculant does not overlap. The absorbent article according to claim 1, wherein the excretion portion opposing portion of the absorbent system disposed opposite to the excretion portion of the wearer when worn has a longitudinal slit extending in the longitudinal direction, and the longitudinal slit penetrates and contains the blood flocculant The above-mentioned absorbent sheet that is closest to the side facing the skin. An absorbent article according to claim 1, wherein the excretion portion facing portion of the absorbent body disposed opposite to the excretion portion of the wearer when worn has a longitudinal slit extending in the longitudinal direction, and the width of the longitudinal slit is 0.1mm Above and below 1mm. The absorbent article of claim 1, wherein the excretion facing portion of the absorbent body disposed opposite to the excretion portion of the wearer when worn has a longitudinal slit extending in the longitudinal direction, and the length of the longitudinal slit when viewed from above is 10mm or more and 35mm or less. An absorbent article according to claim 1, wherein the excretion portion opposing portion of the absorbent body disposed opposite to the excretion portion of the wearer when worn has a longitudinal slit extending in the longitudinal direction, and the longitudinal slit is adjacent in the lateral direction There are a plurality of rows, and the distance between the longitudinal slits adjacent to each other in the lateral direction is 3 mm or more and 20 mm or less. An absorbent article according to claim 1, wherein the excretion portion opposing portion of the absorbent body disposed opposite to the excretion portion of the wearer when worn has longitudinal slits extending in the longitudinal direction, and the longitudinal slits are dispersed in the longitudinal direction There are plural. The absorbent article of claim 1, wherein the basis weight of the blood flocculant in the opposite part of the excretion part is greater than the basis weight of the blood flocculant in the peripheral part of the opposite part of the excretion part. The absorbent article of claim 1, wherein the central absorbent sheet has the following parts, that is, when viewed in the thickness direction, the polymer-rich region and the hydrophilic fiber-rich region of the absorbent sheet are in the thickness direction The configuration is opposite between adjacent absorbent sheets. The absorbent article of claim 1, wherein the central absorbent sheet has a structure in which one absorbent sheet is folded so as to have a structure of at least three layers. The upper layer and the second layer adjacent to the uppermost layer when viewed in the thickness direction, the area rich in hydrophilic fibers and the area rich in polymer are arranged in the same thickness direction. The absorbent article according to claim 1, which contains the blood flocculant only in the central absorbent sheet. The absorbent article according to claim 1, which contains the blood flocculant only in the main absorbent sheet. The absorbent article according to claim 1, which contains the blood flocculant in the central absorbent sheet and the main absorbent sheet. Such as the absorbent article of claim 1, wherein the absorbent sheet on the side closest to the skin abutting surface, when viewed in the thickness direction, has an area rich in hydrophilic fibers on the skin abutting surface and is rich in polymers The area is located on the non-skin contact surface side. The absorbent article according to claim 1, wherein a second sheet comprising non-woven fabric is arranged between the front sheet and the absorbent body, and the second sheet does not contain the blood flocculant. The absorbent article of claim 1, wherein the blood flocculant is a cationic polymer, and the molecular weight of the cationic polymer is 2,000 or more and 10 million or less. The absorbent article of claim 1, wherein the amount of the blood flocculant is 1 g/m ² or more and 20 g/m ² or less. Such as the absorbent article of claim 1, which is used to absorb blood, and the blood flocculant is a water-soluble cationic polymer, and the following water-soluble cationic polymer is applied: the water-soluble cationic polymer contains a main chain and The structure of the side chain bonded to it, and the molecular weight is more than 2000, the above-mentioned water-soluble cationic polymer is a quaternary ammonium salt homopolymer having the repeating unit represented by the following formula 1, or is represented by the following formula 1 The quaternary ammonium salt copolymer of the repeating unit and the repeating unit represented by formula 2 below, the main chain of the water-soluble cationic polymer and the side chain are bonded at one point, and the side chain has quaternary ammonium Location,

The absorbent article of claim 1, wherein as the blood flocculant, it has a water-soluble cationic property containing a quaternary ammonium salt homopolymer or a quaternary ammonium salt copolymer with a flow potential of 1500 μeq/L or more and a molecular weight of 2000 or more The polymer is 1 g/m ² or more and 20 g/m ² or less. The absorbent article of claim 1, wherein the blood flocculant is a water-soluble cationic polymer, and the water-soluble cationic polymer is a quaternary ammonium salt homopolymer or a quaternary ammonium salt copolymer having a main chain and bonding The structure of its side chain, and the main chain and side chain are bonded at one point. The absorbent article of claim 1, wherein as the blood flocculant, it contains a water-soluble cationic polymer with a molecular weight of 2000 or more, and the ratio of the inorganic value to the organic value of the cationic polymer is inorganic value/organic The value of the property value is 0.6 or more and 4.6 or less, and the cationic polymer is a quaternary ammonium salt homopolymer, a quaternary ammonium salt copolymer, or a quaternary ammonium salt condensation polymer. The absorbent article of claim 1, wherein the absorbent article is a menstrual sanitary napkin.

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