JP2017104213A - Sanitary napkin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sanitary napkin which has good absorption performance for excretion containing blood such as menstrual blood and which achieves a comfortable wearing feeling.SOLUTION: A sanitary napkin 1 comprises a first layer 41 containing a water absorptive polymer and a second layer 42 which is to be positioned on a side of wearer's skin relative to the first layer 41 during wearing. The second layer 42 contains an excretion treatment agent that acts on blood contained in excretion of a wearer and modifies the excretion. The excretion treatment agent contains a water soluble cationic polymer and an elution promotion agent which has a hydrophilic group for promoting elution of the water soluble cationic polymer into the excretion.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sanitary napkin that treats excreta containing blood such as menstrual blood and vaginal discharge outside the body.

  A sanitary napkin is used for the treatment of menstrual blood and vaginal discharge. The sanitary napkin usually has a configuration in which an absorbent body capable of absorbing and retaining excretion such as menstrual blood is provided between a top sheet constituting the skin facing surface and a back sheet constituting the non-skin facing surface. As the absorber, those containing a water-absorbing polymer are frequently used. Since the water-absorbing polymer takes in water between the molecular chains constituting the polymer, the water-absorbing polymer has a high water-absorbing property that absorbs water several hundred times its own weight. Since it does not release water even if it is applied, it also has high water retention.

  For example, Patent Document 1 describes an absorbent article containing a fecal denaturant that acts to denature physical properties of excrement such as feces, for example, regarding improvement techniques for absorbent articles such as sanitary napkins. Examples of the stool modifying agent include organic flocculants such as water-soluble polyamides, polyacryls, polyamines, and polyvinylpyrrolidone. According to the absorbent article described in Patent Document 1, physical properties such as the viscosity of excrement excreted by the wearer during wearing are changed by the action of the fecal degeneration agent, so that the negative effect of excrement is minimized. It is said that the improvement of excrement absorption performance can be expected.

  In Patent Document 2, a sanitary tampon that is inserted into the vagina and used to process menstrual blood in the body is flexible as a tampon component for the purpose of preventing inconvenience of the tampon falling out of the vagina during use. It is described that a rich water-soluble film is used, and the water-soluble film is prepared from a solution containing a film precursor such as polyacrylic acid or cellulose derivative, a water-soluble plasticizer, and a pharmacologically active agent. Is described. Patent Document 2 describes that a water-soluble plasticizer used in this water-soluble film has at least one functional group of hydroxyl group, amide group or amino group, and is a specific example of a water-soluble plasticizer. , Propylene glycol, polyethylene glycol, glycerin and the like.

JP 2010-194342 A JP 2001-341145 A

  When a sanitary napkin containing a water-absorbing polymer is used for menstrual blood treatment, most of the surface of the water-absorbing polymer is covered with red blood cells contained in the menstrual blood, and as a result, the ability to absorb excreta by the water-absorbing polymer. There is a problem that decreases. Although it is thought that the technique using the chemical | medical agent which transforms excrement into the form which is easy to process as described in patent document 1 is effective with respect to the subject regarding such menstrual blood, There is room for improvement in the technology, and even if the technology described in Patent Document 1 is adopted, such a problem cannot be solved. In addition, when a water-soluble polymer that can be used as a fecal denaturant in Patent Document 1 is applied to a flexible sheet material made of a nonwoven fabric or the like that is a constituent member of an absorbent article, the applied sheet material becomes hard. Flexibility may be reduced, and as a result, the wearing feeling may be reduced. Patent Document 2 has no suggestion about the problem of improvement in absorption performance such as menstrual blood, and particularly the flexibility that is peculiar to sanitary napkins. A sanitary napkin that has excellent absorption performance of excreta containing blood such as menstrual blood and vaginal discharge and that is flexible and provides a comfortable wearing feeling has not yet been provided.

  Therefore, the present invention relates to providing a sanitary napkin that is excellent in absorption of excreta containing blood such as menstrual blood and can provide a comfortable wearing feeling.

  As a result of various investigations aimed at improving the absorption capacity of menstrual blood in a sanitary napkin, the present inventors have found that in order to prevent the disadvantage that red blood cells contained in menstrual blood cover the surface of the water-absorbing polymer, A high-molecular weight (weight average molecular weight of 500,000 or more) water-soluble cationic polymer with high erythrocyte agglutination ability is placed at a site where menstrual blood excreted can be contacted with menstrual blood before the water-absorbing polymer. However, it has been found that it is effective in achieving such a purpose. However, it has been found that such high molecular weight water-soluble cationic polymers are difficult to elute during menstrual blood, and it is difficult to obtain the expected effects even when the polymer is used alone. Therefore, as a result of further investigation, the present inventors have found that the combined use of a specific water-soluble plasticizer together with a water-soluble cationic polymer increases the amount of elution of the polymer into menstrual blood. It was found that it can be expressed stably. That is, it was found that a water-soluble plasticizer functions as an elution accelerator. Moreover, there is a concern that when a water-soluble cationic polymer is applied to a flexible sheet material made of nonwoven fabric or the like, the sheet material is cured and the feeling of wearing the sanitary napkin is lowered. It has also been found that the advantage that such a concern is dispelled can be obtained by using the agent in combination.

  This invention was made | formed based on the said knowledge, and comprised including the 1st layer containing a water absorbing polymer, and the 2nd layer located in a wearer's skin side from this 1st layer at the time of wear The second layer includes an excrement treating agent that acts on blood contained in a wearer's excrement and alters the excrement, and the excrement treating agent is water-soluble. The present invention provides a sanitary napkin comprising a water-soluble cationic polymer and an elution promoter having a hydrophilic group that can promote the elution of the water-soluble cationic polymer into the excreta.

  ADVANTAGE OF THE INVENTION According to this invention, the sanitary napkin which is excellent in the absorption performance of the excretion containing blood, such as menstrual blood, and can obtain a comfortable wearing feeling is provided.

FIG. 1 is a plan view schematically showing the skin facing surface of one embodiment of the sanitary napkin of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG.

  The sanitary napkin of the present invention includes an excrement treating agent that acts on blood contained in the excrement of the wearer to alter the excrement. When this excrement treating agent comes into contact with menstrual blood, which is a typical excrement, the constituent (water-soluble cationic polymer) of the excrement treating agent is eluted into the menstrual blood, and the anionic property contained in menstrual blood. The menstrual blood is altered by agglutinating erythrocytes to form a hemagglutination. Since the hemagglutination produced by the action of the excrement treating agent is larger than that of red blood cells, even though the hemagglutination may adhere to a part of the surface of the water-absorbing polymer, most of the surface of the water-absorbing polymer is blood cells. The problem of being covered with agglomerates is unlikely to occur, so that the absorption performance inherent to the water-absorbing polymer is stably exhibited. Therefore, the sanitary napkin of the present invention containing such an excrement treating agent is excellent in the ability to absorb excreta containing blood such as menstrual blood.

  The excrement treating agent according to the present invention includes at least a water-soluble cationic polymer. The water-soluble cationic polymer mainly functions as an agglutinating agent for erythrocytes contained in menstrual blood. The term “water-soluble” as used herein refers to the property that when 1 g of a cationic polymer is added and mixed with 1 L of ion-exchanged water having a water temperature of 25 ° C., the total amount of the cationic polymer is dissolved in the ion-exchanged water within 24 hours. Means.

  Examples of the water-soluble cationic polymer include polyethyleneimine, cationized cellulose, dimethylaminoethyl polymethacrylate, polydimethylaminopropylacrylamide, and the like. Further, as another example of the water-soluble cationic polymer, “a water-soluble cationic polymer in which a side chain having a quaternary ammonium moiety is bonded to the main chain at one point” (hereinafter referred to as “main chain-single chain single unit”). And a water-soluble cationic polymer in which a side chain having a quaternary ammonium moiety is bonded to the main chain at two or more points (hereinafter referred to as a “main chain-side chain multiple bond type polymer”). Also called). In the present invention, one of these water-soluble cationic polymers can be used alone or in combination of two or more.

  Examples of the main chain-side chain single bond polymer include poly (2-methacryloxyethyldimethylamine quaternary salt), poly (2-methacryloxyethyltrimethylammonium salt), and poly (2-methacryloxyethyldimethylethyl). Ammonium ethyl sulfate), poly (2-acryloxyethyldimethylamine quaternary salt), poly (2-acryloxyethyltrimethylamine quaternary salt), poly (2-acryloxyethyldimethylethylammonium ethyl sulfate), poly ( 3-dimethylaminopropylacrylamide quaternary salt), polyallylamine hydrochloride and the like. Examples of the main chain-side chain multiple bond type polymer include polydiallylamine hydrochloride, polydiallyldimethylammonium chloride, and polyamidine.

  Among these water-soluble cationic polymers, quaternary ammonium salt homopolymers and quaternary ammonium salt copolymers are preferable, and in particular, quaternary ammonium which is a kind of the main chain-side chain single bond type polymer. Salt homopolymers and quaternary ammonium salt copolymers are preferred from the viewpoint of adsorptivity to erythrocytes.

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

Further, as a preferred example of a quaternary ammonium salt copolymer that is another one of the preferred water-soluble cationic polymers, a polymerizable monomer having a quaternary ammonium moiety, a cationic polymerizable monomer, Examples thereof include a copolymer with an anionic polymerizable monomer or a nonionic polymerizable monomer.
Examples of the “polymerizable monomer having a quaternary ammonium moiety” are as described above as “a cationic polymer having a quaternary ammonium moiety”.
Examples of the cationic polymerizable monomer include vinyl pyridine as a cyclic compound having a nitrogen atom that is cationic under specific conditions, and a nitrogen atom that is cationic under specific conditions. Examples of the linear compound in the main chain include a condensation compound of dicyandiamide and diethylenetriamine.
Examples of the anionic polymerizable monomer include 2-acrylamido-2-methylpropanesulfonic acid, methacrylic acid, acrylic acid, styrenesulfonic acid, and salts of these compounds.
Examples of the nonionic polymerizable monomer include vinyl alcohol, acrylamide, dimethylacrylamide, ethylene glycol, propylene glycol, ethylene glycol monomethacrylate, ethylene glycol monoacrylate, hydroxyethyl methacrylate, hydroxyethyl acrylate, methyl methacrylate, and methyl acrylate. , Ethyl methacrylate, ethyl acrylate, propyl methacrylate, propyl acrylate, butyl methacrylate, butyl acrylate and the like.

  The weight of the water-soluble cationic polymer such as a quaternary ammonium salt homopolymer or a quaternary ammonium salt copolymer from the viewpoint of enhancing the effect of erythrocyte aggregation and further improving the absorption capacity of the water-absorbing polymer to menstrual blood. The average molecular weight is preferably 500,000 or more, more preferably 1 million or more, and further preferably 3 million or more. Such a high molecular weight water-soluble cationic polymer has a higher ability to agglutinate red blood cells, which can be an absorption inhibitor of the water-absorbing polymer, compared with a low molecular weight one, but it dissolves in menstrual blood because of its high molecular weight. Therefore, it is difficult to function as an agglutinating agent for erythrocytes by itself. However, in the present invention, since a water-soluble plasticizer is used in addition to the water-soluble cationic polymer, even when a high-molecular weight water-soluble cationic polymer is used, the elution into the excrement such as menstrual blood is substantially prevented. Therefore, an excellent hemagglutination effect is achieved by the high molecular weight water-soluble cationic polymer, and as a result, the absorption capacity of excrement such as menstrual blood can be improved. The weight average molecular weight of the water-soluble cationic polymer can be measured by the following method.

<Method for measuring weight average molecular weight of polymer>
The molecular weight of the water-soluble cationic polymer can be measured using HLC-8320GPC manufactured by Tosoh Corporation. As the column, a column in which a guard column α manufactured by Tosoh Corporation and an analytical column α-M are connected in series is used at a column temperature of 40 ° C., and RI (refractive index) is used as a detector. The measurement sample is prepared by dissolving 1 mg of the water-soluble cationic polymer to be measured with respect to 1 mL of the eluent. The measurement condition is that the water-soluble cationic polymer to be measured is 1) a copolymer containing a water-soluble polymerizable monomer such as hydroxyethyl methacrylate, and 2) a water-soluble polymerizable monomer such as hydroxyethyl methacrylate. It differs depending on the case other than the copolymer containing a monomer.

  Specific measurement conditions in the case of 1) are as follows. As the eluent, an eluent in which 150 mmol / L sodium sulfate and 1% by mass of acetic acid are dissolved in water is used. A pullulan mixture with a molecular weight of 5900, a pullulan with a molecular weight of 47300, a pullulan with a molecular weight of 212,000, a pullulan with a molecular weight of 788,000 and a 2.5-mg pullulan mixture in 10 mL of the eluent is used as a molecular weight standard. The flow rate is 1.0 mL / min, and the injection volume of the measurement sample to the column is 100 μL.

  Specific measurement conditions in the case of 2) are as follows. As the eluent, an eluent obtained by dissolving 50 mmol / L lithium bromide and 1% by mass of acetic acid in an ethanol aqueous solution with a volume ratio of ethanol: water = 3: 7 is used. Polyethylene glycol (PEG) having a molecular weight of 106, PEG having a molecular weight of 400, PEG having a molecular weight of 1470, PEG having a molecular weight of 6450, polyethylene oxide having a molecular weight of 50,000 (PEO), PEO having a molecular weight of 235,000, A PEG-PEO mixture having a molecular weight of 875,000 and 10 mg each dissolved therein is used as a molecular weight standard. The flow rate is 0.6 mL / min, and the injection volume of the measurement sample to the column is 100 μL.

  The content of the water-soluble cationic polymer in the excrement treating agent according to the present invention (the total content of the water-soluble cationic polymers when a plurality of water-soluble cationic polymers are used in combination) is based on the total mass of the excretory treating agent. Preferably, it is 20% by mass or more, more preferably 40% by mass or more, and preferably 80% by mass or less, more preferably 60% by mass or less, more specifically, preferably 20% by mass or more and 80% by mass or less. More preferably, it is 40 mass% or more and 60 mass% or less. In addition, even when the excrement treating agent according to the present invention is composed of only the water-soluble cationic polymer and the elution accelerator described later, that is, when it contains no other components other than these two components, The content of the cationic polymer is preferably within the above range. If the content of the water-soluble cationic polymer is too small, the significance of using it (preventing absorption inhibition of the water-absorbing polymer due to blood in the excrement) is poor, and the content of the water-soluble cationic polymer is low. If the amount is too large, the water-soluble cationic polymer is excessively adsorbed on blood cells to act as a dispersing agent, and the aggregating action is diminished.

  In addition to the water-soluble cationic polymer, the excrement treating agent according to the present invention further comprises an elution promoter having a hydrophilic group that can promote elution of the water-soluble cationic polymer into excrement such as menstrual blood. Including. As the elution accelerator, those which are water-soluble and have an action of softening (plasticizing) a resin such as polyvinyl alcohol when added are preferable, and substances generally used as water-soluble plasticizers can be used. The term “water-soluble” as used herein means that when 1 g of an elution accelerator (water-soluble plasticizer) is added to and mixed with 1 L of ion-exchanged water having a water temperature of 25 ° C., the total amount of the elution accelerator is within 24 hours. It means the property of being dissolved in the exchange water, and is substantially the same as the “water solubility” for the water-soluble cationic polymer described above.

  Regarding the “water-solubility” of the elution promoter, the water solubility of the elution promoter is preferably 0.05 g or more, more preferably 0.1 g or more, preferably 100 g of water at 25 ° C. 1 g or more. It is preferable that the elution accelerator has a molecular weight exhibiting the water solubility.

  Specific examples of the elution promoter include polyhydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, dibutylene glycol, glycerin, diglycerin, triglycerin, erythritol, and pentaerythritol. And glycols such as polyethylene glycol; polyethers such as polypropylene glycol and the like. These can be used alone or in combination of two or more.

  As a preferred example of the elution accelerator (water-soluble plasticizer), one or more hydrophilic groups selected from the group consisting of hydroxyl group, amide group and amino group (promoting elution of water-soluble cationic polymer into excrement) Having a hydrophilic group). Specific examples of preferable elution promoters that satisfy this condition include glycerin, polyethylene glycol, and ethylene glycol.

  The content of the dissolution enhancer in the excrement disposal agent according to the present invention (the total content of the dissolution enhancers when using multiple types of dissolution enhancers) is preferably relative to the total mass of the excrement disposal agent. 20% by weight or more, more preferably 40% by weight or more, and preferably 80% by weight or less, more preferably 60% by weight or less, more specifically, preferably 20% by weight or more and 80% by weight or less, more preferably It is 40 mass% or more and 60 mass% or less. In addition, even when the excrement treating agent according to the present invention is composed of only the water-soluble cationic polymer and the elution accelerator, that is, when no other components other than these two components are included, the elution accelerator. The content of is preferably in the above range. When the content of the elution accelerator is too small, the use of the elution accelerator is insufficient (promotion of elution of the water-soluble cationic polymer, prevention of reduction in flexibility due to the water-soluble cationic polymer), and the elution accelerator When there is too much content of, when it is made to contain in this structural member by apply | coating this to the structural member (2nd layer) of a sanitary napkin, etc., the favorable content state which can show | play a sufficient effect is shown. There is a risk that it cannot be maintained.

  The excrement treating agent according to the present invention can be prepared by mixing the above-mentioned two components, that is, a water-soluble cationic polymer and an elution accelerator. In the excrement treating agent according to the present invention, other components other than the water-soluble cationic polymer and elution accelerator, for example, a viscosity modifier for improving applicability, without departing from the spirit of the present invention. In addition, skin care agents, antibacterial agents, deodorants and the like may be included.

  The sanitary napkin of the present invention includes a first layer containing a water-absorbing polymer and a second layer located on the skin side of the wearer from the first layer when worn. And the said excrement processing agent is contained in a 2nd layer. When the sanitary napkin is worn, since the second layer is located closer to the wearer's skin than the first layer containing the water-absorbing polymer, the second layer can be used for excretion such as menstrual blood excreted by the wearer. On the other hand, the red blood cells in the excrement that may cause the absorption inhibition of the water-absorbing polymer due to the presence of the excrement treating agent in the second layer, usually in contact with the second layer before the first layer. Flocculates before reaching the water-absorbing polymer in the first layer, and forms a blood cell aggregate that hardly absorbs absorption of the water-absorbing polymer. Therefore, the sanitary napkin of the present invention is excellent in the absorption performance of excreta containing blood such as menstrual blood.

  In the sanitary napkin of the present invention, the first layer containing the water-absorbing polymer and the second layer containing the excrement treating agent are adjacent to each other in the thickness direction without interposing another layer. Alternatively, one layer or two or more other layers (a layer not containing the water-absorbing polymer and the excrement treating agent) are interposed between the first layer and the second layer. Also good.

  The 1st layer containing a water absorbing polymer may be comprised only from the water absorbing polymer, or may be comprised including other components other than a water absorbing polymer. A typical example of the first layer is a member also called an absorbent core that is usually included in this type of absorbent article, and specifically, for example, wood pulp, synthetic fiber that has been subjected to hydrophilic treatment, and the like. What is comprised including a fiber material and a particulate water-absorbing polymer is mentioned. In the absorbent core having such a configuration, the water-absorbing polymer is usually held in the aggregate of the fiber material through the adhesive force generated in the wet-state water-absorbing polymer or a binder such as an adhesive or an adhesive fiber added separately. ing.

  As the water-absorbing polymer used in the present invention, that is, the water-absorbing polymer contained in the first layer, a polymer that can absorb and retain a liquid 20 times or more of its own weight and can be gelled is preferable. Examples of such water-absorbing polymers include starch, crosslinked carboxymethylated cellulose, polymers or copolymers of acrylic acid or alkali metal acrylates, such as polyacrylic acid and salts thereof, and polyacrylate graft polymers. Can be mentioned. As the polyacrylic acid salt, a sodium salt can be preferably used. In addition, a comonomer such as maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate or styrenesulfonic acid is added to acrylic acid. A copolymer obtained by copolymerization within a range not deteriorating the performance of the water-absorbing polymer can also be preferably used.

  The shape of the water-absorbing polymer is not particularly limited, and any shape such as a spherical shape, a lump shape, a grape shape, or a fiber shape can be used. The average particle diameter of the water-absorbing polymer is preferably 10 μm or more, more preferably 100 μm or more, and preferably 1000 μm or less, more preferably 800 μm or less, more specifically, preferably 10 to 1000 μm, more preferably 100 to 100 μm. 800 μm.

The content (basis weight) per unit area of the water-absorbing polymer in the first layer is preferably 10 g / m ² or more, more preferably 50 g / m ² or more, and preferably 500 g / m ² or less, more preferably Is 400 g / m ² or less, more specifically, preferably 10 g / m ² or more and 500 g / m ² or less, more preferably 50 g / m ² or more and 400 g / m ² or less.

  The second layer is not particularly limited as long as it can contain the excrement treating agent and can pass excrement such as menstrual blood, and is typically a liquid usually used in this type of absorbent article. It is a permeable sheet material, and specifically, paper, non-woven fabric, woven fabric, porous resin film, or the like can be used. For example, when the first layer is the absorbent core, a liquid-permeable sheet material (so-called core wrap sheet) that covers the skin facing surface of the absorbent core can be used as the second layer. . Further, the second layer may have a single layer structure or a multilayer structure in which a plurality of sheet materials are laminated. In the latter case, the excrement treating agent may be contained in an arbitrary layer. In addition, the method for containing the excrement treating agent in the second layer is not particularly limited, and the second layer is immersed in the excrement treating agent by spray coating the excrement treating agent on the second layer. It is possible to use a known method such as.

The content (basis weight) per unit area of the excrement treating agent in the second layer is preferably 0.01 g / m ² or more, more preferably 0.5 g / m ² or more, and preferably 20 g / m. m ² or less, more preferably 10 g / m ² or less, more specifically preferably 0.01 g / m ² or more and 20 g / m ² or less, more preferably 0.5 g / m ² or more and 10 g / m ² or less. is there. Even when the excrement treating agent is composed of only the water-soluble cationic polymer and the elution accelerator, that is, when it contains no other components other than these two components, The amount is preferably within the above range.

  The napkin 1 which is one Embodiment of the sanitary napkin of this invention is shown by FIG.1 and FIG.2. The napkin 1 has a longitudinal direction X corresponding to the wearer's front-rear direction and a lateral direction Y orthogonal thereto, and the maximum length of the longitudinal direction X in the plan view as shown in FIG. Compared to this, it has a vertically long shape, and more specifically, it has a substantially long elliptical shape in which the central portion in the vertical direction X is inwardly bound.

  The napkin 1 includes a liquid-permeable surface sheet 2 that forms the skin-facing surface of the napkin 1, a liquid-impermeable or liquid-permeable or water-repellent back sheet 3 that forms the non-skin-facing surface of the napkin 1, The liquid-retaining absorbent 4 interposed between the two sheets 2 and 3 is provided, and these are integrated by a known joining means such as an adhesive. Each of the top sheet 2 and the back sheet 3 extends from the peripheral edge of the absorbent body 4, and is joined to each other by known joining means such as an adhesive or heat seal at the end of the extension part, thereby end seal part 5 Is forming. On the skin-facing surface of the napkin 1, a leak-proof groove 6 having an annular shape in plan view is formed, in which the top sheet 2 and the absorbent body 4 are integrally recessed. A pair of side seats 7, 7 are arranged over substantially the entire length in the vertical direction X of the napkin 1 on both left and right side portions along the vertical direction X on the skin facing surface of the napkin 1. In the present specification, the “skin-facing surface” is a surface of the sanitary napkin or a component thereof that is directed toward the wearer's skin when the sanitary napkin is worn, that is, a side that is relatively close to the wearer's skin. The “non-skin-facing surface” is a surface of the sanitary napkin or a component thereof facing away from the skin side when the sanitary napkin is worn, that is, a surface facing a clothing such as shorts, in other words, relatively facing the skin. It is the surface farther from the skin than the surface.

  The absorbent body 4 includes a liquid-retaining absorbent core 41 and a core wrap sheet 42 that covers both the skin facing surface and the non-skin facing surface of the absorbent core 41. The absorbent core 41 includes a fiber material and a particulate water-absorbing polymer, and corresponds to the “first layer” according to the present invention described above. The core wrap sheet 42 contains at least the excrement treating agent at the skin side portion (the portion interposed between the topsheet 2 and the absorbent core 41) covering at least the skin facing surface of the absorbent core 41. The skin side portion of the core wrap sheet 42 corresponds to the “second layer” according to the present invention described above.

  In the napkin 1 having such a configuration, when the menstrual blood excreted by the wearer passes through the top sheet 2 and reaches the core wrap sheet 42 (second layer), the excrement contained in the core wrap sheet 42 The treatment agent elutes during menstrual blood. More specifically, the water-soluble cationic polymer contained in the excrement treatment agent acts as an action of the elution enhancer contained in the excrement treatment agent. To elute into menstrual blood. As a result, the erythrocytes in menstrual blood are aggregated by the action of the water-soluble cationic polymer, and as a result, a blood cell aggregate is formed in the menstrual blood. The menstrual blood that has reached the core wrap sheet 42 passes through the core wrap sheet 42 and reaches the absorbent core 41 (first layer). However, it is a hemagglutination clot larger than erythrocytes. Therefore, the disadvantage that most of the surface of the water-absorbing polymer in the absorbent core 41 is covered with erythrocytes hardly occurs. In the napkin 1, the absorption performance inherent to the water-absorbing polymer is sufficiently exhibited. In addition, the core wrap sheet 42 does not lose its inherent flexibility due to the action of the elution accelerator, even though it contains the water-soluble cationic polymer. Therefore, the napkin 1 as a whole is flexible and comfortable. A comfortable wearing feeling is obtained.

  The sanitary napkin of the present invention is not limited to the illustrated form (napkin 1), and can be appropriately changed without departing from the spirit of the present invention. For example, in the napkin 1, the excrement treating agent may be contained not in the core wrap sheet 42 but in the top sheet 2. That is, the top sheet 2 may be a “second layer” according to the present invention. Or you may make the core wrap sheet | seat 42 and the surface sheet 2 contain the said excrement processing agent.

  In addition, the excrement treating agent according to the present invention is applied to sanitary products such as commercially available sanitary napkins, that is, “elution having a water-soluble cationic polymer and a hydrophilic group capable of promoting the elution of the water-soluble cationic polymer into excreta. Whether or not a “composition containing an accelerator” is contained can be confirmed by the following method. First, the hot melt adhesive that adheres each member to a sanitary product to be analyzed using a heating device such as a dryer is invalidated and decomposed into members such as a top sheet, an absorber, and a back sheet. Next, a multi-stage solvent extraction method from a nonpolar solvent to a polar solvent is performed on each decomposed member to separate the treatment agent used in each member, and a solution containing a single composition is obtained. obtain. And the obtained solution was dried and solidified, and the weight was measured, and 1H-NMR (nuclear magnetic resonance method), IR (infrared spectroscopy), LC (liquid chromatography), GC (gas chromatography), MS ( Mass spectrometry), GPC (gel permeation chromatography), fluorescent X-rays and the like are combined to identify the structure of the treatment agent. Based on such identification results, among treatment agents separated from hygiene products, water-soluble and cationic polymers are treated as “water-soluble cationic polymers” according to the present invention, and those having hydrophilic groups according to the present invention. Treat as "elution promoter" (water-soluble plasticizer), treat other substances as other components, and calculate the amount of each.

〔Example〕
Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

(Preparation of excrement treatment agent)
Excrement treatment agents A to H having the compositions shown in Table 1 below were prepared. Details of the water-soluble cationic polymer and elution accelerator used in the preparation are as follows.
(1) Water-soluble cationic polymer / polydiallyldimethylammonium hydrochloride (weight average molecular weight 600,000) (quaternary ammonium salt homopolymer): UNIKA FPA1000L manufactured by SENKA CORPORATION
Polymethacryloxyethyldimethylammonium diethylsulfate (weight average molecular weight 5.2 million) (quaternary ammonium salt homopolymer): Methacryloxyethyldimethylammonium ethylsulfate monomer is dissolved in ethanol as a solvent, and oil-soluble It was prepared by adding 2,2′-Azobis (2-methylpropionamidine) dihydrochloride (V-65B manufactured by Wako Pure Chemical Industries, Ltd.), which is an azo initiator, and polymerizing by heating.
Polydiallyldimethylammonium hydrochloride (weight average molecular weight 150,000) (quaternary ammonium salt homopolymer): Marquat 100 manufactured by Lubrizol (Merquat 100 Polymer)
(2) Elution accelerator (water-soluble plasticizer)
・ Glycerin: Wako Pure Chemical Industries, Ltd. (special grade reagent)
・ Polyethylene glycol: Wako Pure Chemical Industries, Ltd. (Wako first grade product)

[Evaluation Test 1]
Using the prepared excrement treating agent, a model sheet of “second layer containing excretory treating agent in sanitary napkin” was produced. Specifically, a 5 cm square tissue paper having a basis weight of 16 g / m ² is prepared as a model sheet of a core wrap sheet for covering an absorbent core in a sanitary napkin. A model sheet was prepared by spraying and drying the excrement treating agent to be evaluated in an amount corresponding to 400% by mass. The adhesion amount of the excrement treating agent on the model sheet was 5.0 g / m ² . About the produced model sheet | seat, the volume swelling magnification of the water absorbing polymer was evaluated with the following method. The results are shown in Table 1 below. The larger the value of the volume swelling ratio, the higher the absorption inhibition performance (red blood cell aggregating ability) of the water-absorbing polymer by the excrement treating agent, which is highly evaluated.

<Method for evaluating volume swelling ratio of water-absorbing polymer>
First, two acrylic cylinders with an inner diameter of 35 mm that open at the top and bottom are arranged up and down with the axes of both cylinders aligned, and the model sheet to be evaluated is sandwiched between the top and bottom cylinders. In the upper cylinder, 3 g of blood whose viscosity is adjusted to 8 mPa · s is repeatedly supplied 3 times at intervals of 3 minutes. The supplied blood passes through the model sheet and disappears from the upper cylinder. Blood that has permeated the model sheet is collected.
Next, one water-absorbing polymer having a diameter of about 400 μm is placed on a glass slide, and three drops of blood collected by the above operation are dropped on the water-absorbing polymer with a Pasteur pipette. The blood was absorbed and swollen. After the blood was dropped, the water-absorbing polymer was sealed with a small screw cap to prevent moisture transpiration. After 10 minutes, the lid was removed, and an excess amount of blood in the water-absorbing polymer was absorbed and removed using absorbent paper. Subsequently, the diameter of the water-absorbing polymer was measured with an optical microscope. When the diameter of the water-absorbing polymer before swelling is R1 (μm) and the diameter after swelling is R2 (μm), the volume swelling ratio is defined by (R2 / R1) ³ .

[Examples 1-2 and Comparative Examples 1-5]
A sanitary napkin having the same configuration as that of the napkin 1 shown in FIGS. 1 and 2 was produced according to a conventional method. An air-through nonwoven fabric having a basis weight of 25 g / m ² was used as the top sheet, and a moisture-impermeable polyethylene film having a basis weight of 37 g / m ² was used as the back sheet. As an absorptive core (first layer), a hot melt in which each member is bonded using a drier from a commercially available sanitary napkin (Kao Co., Ltd., 2015, “Laurie slim guard with wings for daytime use”). The adhesive was invalidated and used after being disassembled and taken out. Tissue paper having a basis weight of 16 g / m ² was used as the core wrap sheet (second layer) covering the absorbent core. The core wrap sheet containing the excrement treating agent was prepared by applying and drying any one of the excrement treating agents A to F over the entire core wrap sheet.

[Evaluation Test 2]
About the sanitary napkin of an Example and a comparative example, the liquid return amount (wet back amount) and the softness | flexibility were evaluated by the following method. In addition, about the softness | flexibility, the core wrap sheet | seat (2nd layer) was taken out from the sanitary napkin of evaluation object, and the taken out core wrap sheet | seat was evaluated with the following method. The results are shown in Table 2 below.

<Flexibility evaluation method>
Daiei Kagaku Seiki Co., Ltd., using the core wrap sheet to be evaluated in accordance with the handle ohm method described in “JIS L 1096 Fabric and Knitted Fabric Test Method” (8.20. Compression rate and compression modulus E method) Measurement was performed using a handle ohmmeter (HOM-3) manufactured by Seisakusho. The test piece had a square shape of 50 mm × 50 mm in plan view, and the slit width was measured at 5 mm. The smaller the measured pressure value, the better the test piece is, and thus the excrement disposal agent in the test piece is the tissue paper that forms the main part of the test piece. Indicates that it is difficult to lower.

<Evaluation method of liquid return amount>
The sanitary napkin to be evaluated is spread in a flat shape and placed horizontally so that the skin facing surface side (surface sheet side) faces upward. On the napkin, an acrylic product having a cylinder inner diameter of 22 mmφ and a cylinder height of 50 mm is made. The acrylic injection plate integrally molded so that the cylindrical portion is positioned on the injection opening of 10 mmφ, the injection hole is in the center of the excretion part facing region in the skin facing surface (surface sheet side) of the napkin It is placed so as to be positioned, and an appropriate weight plate is placed thereon (including the liquid injection plate itself) so that the load is adjusted to 5 g / m ² . 3 g of horse defibrinated blood manufactured by Japan Biotest Laboratories Co., Ltd., whose viscosity is adjusted to 8 mPa · s, is measured into a 10 cc injection beaker. This blood is poured into the cylinder of the infusion plate at a stretch, then left for 3 minutes, then 3 g is poured again, and the pkin is left for 3 minutes. Immediately after that, 10 pieces of weighed absorbent paper (Advantech 5A, 55 mmφ) and a 960 g weight of a rectangular parallelepiped were placed on the napkin where blood was poured and allowed to stand for 10 seconds, and the absorbent paper after 10 seconds. From the weight, the amount (g) of blood absorbed by the absorbent paper is calculated. The measurement is performed three times, and the average value is taken as the liquid return amount of the napkin. It shows that the said napkin is excellent in absorption performance, so that the value of liquid return amount is small.

表１より、水溶性カチオン性ポリマーを有しない排泄物処理剤Ｈよりも、水溶性カチオン性ポリマーを有する排泄物処理剤Ａ〜Ｇの方が、吸水性ポリマーの体積膨潤倍率が優れていることがわかる。また、表２より、水溶性カチオン性ポリマーを有しない比較例４及び５よりも、水溶性カチオン性ポリマーを有する実施例１及び２並びに比較例１〜３の液戻り量は優れている。さらに、溶出促進剤を併せて有する実施例１及び２は液戻り量と柔軟性とを両立していることがわかる。

From Table 1, the excrement treating agents A to G having a water-soluble cationic polymer are superior in the volume swelling ratio of the water-absorbing polymer than the excretory treating agent H having no water-soluble cationic polymer. I understand. Moreover, from Table 2, the liquid return amounts of Examples 1 and 2 and Comparative Examples 1 to 3 having a water-soluble cationic polymer are superior to Comparative Examples 4 and 5 having no water-soluble cationic polymer. Furthermore, it turns out that Example 1 and 2 which also has an elution promoter has both the amount of liquid return and a softness | flexibility.

DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Top sheet 3 Back sheet 4 Absorbent body 41 Absorbent core (1st layer)
42 Core wrap sheet (second layer)
5 End seal portion 6 Leak-proof groove 7 Side seat X Vertical direction Y Horizontal direction

Claims (5)

A sanitary napkin comprising a first layer containing a water-absorbing polymer and a second layer located on the skin side of the wearer from the first layer when worn,
The second layer includes an excrement treating agent that acts on blood contained in the excrement of the wearer and alters the excrement,
The excrement treating agent is a sanitary napkin comprising a water-soluble cationic polymer and an elution accelerator having a hydrophilic group capable of promoting the elution of the water-soluble cationic polymer into the excrement.   The sanitary napkin according to claim 1, wherein the water-soluble cationic polymer has a weight average molecular weight of 500,000 or more.   The sanitary napkin according to claim 1 or 2, wherein the water-soluble cationic polymer is at least one selected from the group consisting of a quaternary ammonium salt homopolymer and a quaternary ammonium salt copolymer.   The water-soluble cationic polymer is the quaternary ammonium salt copolymer, a polymerizable monomer having a quaternary ammonium moiety, a cationic polymerizable monomer, an anionic polymerizable monomer, or The sanitary napkin according to any one of claims 1 to 3, wherein the sanitary napkin is a copolymer with a nonionic polymerizable monomer.   The sanitary napkin according to any one of claims 1 to 4, wherein the hydrophilic group of the elution promoter is at least one selected from the group consisting of a hydroxyl group, an amide group, and an amino group.

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