Absorbent article

Abstract

To provide an absorbent article excellent in rewetting resistance.SOLUTION: The absorbent article 1 for absorbing blood comprises an absorbent body 9 having an absorbent core 11 and a liquid-permeable sheet 3 arranged on the skin side of the absorbent body 9, wherein the liquid-permeable sheet 3 contains a blood lubricity imparting agent 31 for transferring the blood to the absorbent body 9. The absorbent article 1 includes an osmotic pressure adjusting agent 33 for adjusting the osmotic pressure of the blood cell component in the blood, and the absorbent core 11 includes a superabsorbent polymer and a hydrophilic fiber so that the ratio of the superabsorbent polymer to the hydrophilic fiber is 5 mass% or more.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to absorbent articles. [Background technology]

[0002] Studies are being conducted to improve the absorbency of absorbent articles. For example, Patent Document 1 discloses an absorbent article having an absorbent body for absorbing blood, which contains a highly absorbent polymer, and which is characterized by containing an osmotic pressure regulator that adjusts the osmotic pressure of blood cell components in the blood.

[0003] For example, Patent Document 2 discloses an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body between the liquid-permeable top sheet and the liquid-impermeable back sheet, in which the liquid-permeable top sheet has an uneven structure including convex portions and concave portions on the skin-contacting surface, and the liquid-permeable top sheet has a thickness of 0.01 to 80 mm at 40°C at least on the convex portions in the excretory opening-contacting region. 2 The absorbent article is characterized in that it contains a blood slipping agent having a kinematic viscosity of 0.01 to 4.0 mass % and a weight-average molecular weight of less than 1,000. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-013798 [Patent Document 2] International Publication No. 2013 / 129236 Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Documents 1 and 2 do not disclose the absorbent article according to the present disclosure. Therefore, an object of the present disclosure is to provide an absorbent article that has excellent rewet resistance. [Means for solving the problem]

[0006] The present inventors have discovered an absorbent article for absorbing blood, comprising an absorbent body having an absorbent core and a liquid-permeable sheet arranged closer to the skin than the absorbent body, wherein the liquid-permeable sheet contains a blood slipping agent for transferring the blood to the absorbent body, the absorbent article contains an osmotic pressure adjusting agent for adjusting the osmotic pressure of blood cell components in the blood, and the absorbent core contains a superabsorbent polymer and hydrophilic fibers such that the ratio of the superabsorbent polymer to the hydrophilic fibers is 5% by mass or more. [Effects of the Invention]

[0007] The absorbent article according to the present disclosure has excellent rewet resistance. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating a sanitary napkin 1 according to a first embodiment. [Figure 2] FIG. 2 is a diagram illustrating the sanitary napkin 1 according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Specifically, the present disclosure relates to the following aspects: [Aspect 1] An absorbent article for absorbing blood, comprising an absorbent body having an absorbent core and a liquid-permeable sheet disposed closer to the skin than the absorbent body, the liquid-permeable sheet contains a blood slipping agent for transferring the blood to the absorbent body, the absorbent article includes an osmotic pressure adjuster for adjusting the osmotic pressure of blood cell components in the blood, The absorbent core contains a superabsorbent polymer and hydrophilic fibers such that the ratio of the superabsorbent polymer to the hydrophilic fibers is 5% by mass or more. An absorbent article characterized by:

[0010] In the above-mentioned absorbent article, the liquid-permeable sheet arranged closer to the skin than the absorbent body contains a predetermined blood slipping agent, the absorbent article contains a predetermined osmotic pressure adjusting agent, and the absorbent core contains a predetermined ratio of superabsorbent polymer. The blood slipping agent has a blood sliding effect, which allows blood that has reached the liquid-permeable sheet of the absorbent article to slide quickly, together with the blood slipping agent, into the absorbent body, particularly the absorbent core. The osmotic pressure adjuster adjusts the osmotic pressure of blood cell components (such as red blood cells, white blood cells, and platelets) in the blood, dehydrating and shrinking the blood cell components, deforming them, and inhibiting adhesion between the blood cell components attached to the surface of the superabsorbent polymer. This adhesion inhibition effect ensures a path for blood to pass between the blood cell components, facilitating their absorption by the superabsorbent polymer. The combination of the blood sliding effect of the blood slipping agent and the adhesion inhibition effect of the osmotic pressure adjuster results in the absorbent article having excellent rewet resistance against blood.

[0011] [Aspect 2] 2. The absorbent article according to aspect 1, wherein the absorbent core contains the superabsorbent polymer and the hydrophilic fibers such that the ratio of the superabsorbent polymer to the hydrophilic fibers is 10 to 20% by mass.

[0012] In the absorbent article, the absorbent core contains the superabsorbent polymer and the hydrophilic fiber in a predetermined ratio, so that the blood slipping agent can rapidly exert its blood sliding effect and the osmotic pressure adjuster can rapidly exert its adhesion suppression effect, resulting in the absorbent article having excellent rewet resistance against blood.

[0013] [Aspect 3] The absorbent article according to aspect 1 or 2, wherein the blood slipping agent and the osmotic pressure adjusting agent are arranged so as to overlap each other in the thickness direction of the absorbent article. In the absorbent article, the blood slipping agent and the osmotic pressure adjuster are arranged so as to overlap in the thickness direction, so that the blood slipping agent can rapidly exert its blood sliding effect and the osmotic pressure adjuster can rapidly exert its adhesion suppression effect, resulting in the absorbent article having excellent rewet resistance against blood.

[0014] [Aspect 4] The absorbent article according to any one of aspects 1 to 3, wherein the blood slipping agent is disposed closer to the skin than the osmotic pressure adjusting agent in the thickness direction of the absorbent article. In the absorbent article, the blood slipping agent is disposed closer to the skin than the osmotic pressure adjuster in the thickness direction of the absorbent article. Therefore, after the blood slipping agent quickly exerts its blood sliding effect, the osmotic pressure adjuster can quickly and accurately exert its adhesion inhibitory effect, and the absorbent article has excellent rewetting resistance against blood.

[0015] [Aspect 5] The absorbent article according to any one of aspects 1 to 4, wherein the amount of the osmotic pressure adjusting agent per absorbent article is greater than the amount of the blood slipping agent. The absorbent article can allow the blood slipping agent to exhibit a blood sliding effect while allowing the osmotic pressure adjusting agent to appropriately exhibit an adhesion inhibiting effect.

[0016] [Aspect 6] 6. The absorbent article according to any one of aspects 1 to 5, wherein the absorbent body contains 0.08 to 1.00 g of the osmotic pressure adjusting agent per absorbent article.

[0017] In the absorbent article, since the absorber contains a predetermined amount of an osmotic pressure adjuster, the osmotic pressure adjuster can exert its adhesion-inhibiting effect for a long period of time, and as a result, the absorbent article has excellent rewet resistance against blood for a long period of time, making the absorbent article suitable for applications such as long-term wear and absorbing large amounts of menstrual blood.

[0018] [Aspect 7] Aspect 7. The absorbent article according to any one of aspects 1 to 6, wherein the absorbent body comprises the osmotic pressure adjusting agent. In the absorbent article, the absorbent body (e.g., the entire absorbent body, the absorbent core, and materials constituting the absorbent body other than the absorbent core) contains an osmotic pressure adjuster, which can adequately exert its adhesion suppression effect, and therefore the absorbent article has excellent rewet resistance against blood.

[0019] [Aspect 8] An absorbent article described in any one of aspects 1 to 7, wherein the absorbent further comprises a skin-side core wrap sheet arranged on the skin side of the absorbent core, and the absorbent comprises the osmotic pressure adjusting agent in the skin-side core wrap sheet. In the absorbent article, the absorbent body includes an osmotic pressure adjuster in the skin-side core wrap sheet, so that the osmotic pressure adjuster can effectively suppress adhesion before blood reaches the absorbent core, thereby providing the absorbent article with excellent rewet resistance against blood.

[0020] [Aspect 9] The absorbent article according to any one of aspects 1 to 8, wherein the liquid-permeable sheet includes a skin-contact sheet having a skin-contact surface that contacts the skin of a user, and the skin-contact sheet contains the blood slipping agent.

[0021] In the above absorbent article, since the skin-contacting sheet contains a blood slipping agent, the blood slipping agent can accurately exert a blood sliding effect on blood that reaches the skin-contacting sheet, and therefore the absorbent article has excellent rewetting resistance against blood.

[0022] [Aspect 10] 10. The absorbent article according to aspect 9, wherein the skin-contacting sheet comprises the blood slipping agent on the skin-contacting surface. In the above-mentioned absorbent article, since the skin-contacting sheet is provided with a blood slipping agent on the skin-contacting surface, the blood slipping agent can accurately exert a blood sliding effect on blood that reaches the skin-contacting surface of the skin-contacting sheet, and therefore the above-mentioned absorbent article has excellent rewetting resistance against blood.

[0023] [Aspect 11] 11. The absorbent article according to any one of aspects 1 to 10, wherein the osmotic pressure adjusting agent comprises at least one component selected from the group consisting of neutral zwitterions, sugars, and polyhydric alcohols. In the absorbent article, since the osmotic pressure adjuster contains a predetermined substance, the osmotic pressure adjuster can more effectively exert the adhesion suppression effect, and therefore the absorbent article has excellent rewet resistance against blood.

[0024] [Aspect 12] 12. The absorbent article according to any one of aspects 1 to 11, wherein the osmotic pressure adjuster comprises at least one selected from the group consisting of glycine, alanine, erythritol, and xylitol. In the absorbent article, since the osmotic pressure adjuster contains a predetermined substance, the osmotic pressure adjuster can more effectively exert the adhesion suppression effect, and therefore the absorbent article has excellent rewet resistance against blood.

[0025] [Aspect 13] The liquid-permeable sheet contains the blood slipping agent in an amount of 1.0 to 10.0 g / m 2 13. The absorbent article of any one of aspects 1 to 12, comprising: In the absorbent article, since the liquid-permeable sheet contains the blood slipping agent at a predetermined basis weight, the blood slipping agent can accurately exert its blood sliding effect, and the absorbent article has excellent rewetting resistance against blood.

[0026] [Aspect 14] The blood slipping agent has a viscosity of 0.01 to 80 mm at 40°C. 2114. The absorbent article of any one of aspects 1 to 113, having a kinematic viscosity of 0.01 to 4.0 mass % / s, a water holding percentage of 0.01 to 4.0 mass %, and a weight average molecular weight of less than 1,000. In the absorbent article, since the blood slipping agent has a predetermined structure, the blood slipping agent can adequately exhibit the blood sliding effect, and the absorbent article has excellent rewetting resistance against blood.

[0027] [Aspect 15] The absorbent core contains the superabsorbent polymer in an amount of 10 to 100 g / m 2 15. The absorbent article of any one of aspects 1 to 14, comprising: In the above-mentioned absorbent article, since the absorbent core contains a highly absorbent polymer at a predetermined basis weight, the blood slipping agent is more likely to accurately exert its blood sliding effect, and the osmotic pressure adjusting agent is more likely to accurately exert its adhesion inhibitory effect, so that the absorbent article has excellent rewetting resistance against blood.

[0028] The absorbent article for absorbing blood according to the present disclosure will now be described in detail. 1 and 2 are diagrams illustrating a sanitary napkin 1 according to one embodiment of an absorbent article according to the present disclosure (hereinafter referred to as the "first embodiment"). Specifically, Fig. 1 is a plan view of the sanitary napkin 1 in an unfolded state. Fig. 2 is an end view taken along the line II-II in Fig. 1.

[0029] The sanitary napkin 1 has a longitudinal direction L, a width direction W, and a thickness direction T that are perpendicular to each other, and has an elongated outer shape in which two edges in the longitudinal direction L each protrude in an arc shape outward in the longitudinal direction L. In the thickness direction T, the sanitary napkin 1 basically comprises a liquid-permeable skin-contact sheet 3, a liquid-impermeable sheet 7 that forms the surface of the non-skin-facing side of the sanitary napkin 1, and an absorbent body 9 located between the skin-contact sheet 3 and the liquid-impermeable sheet 7. The skin-contact sheet 3 has a skin-contact surface 5a that forms the surface of the skin-facing side of the sanitary napkin 1, and an opposite non-skin-contact surface 5b.

[0030] The sanitary napkin 1 further comprises a pair of side sheets 21 positioned at both ends of the sanitary napkin 1 in the width direction W on the skin-facing surface 5a side of the skin-contact sheet 3 and extending in the longitudinal direction L, and having inner ends in the width direction W that stand up to form a leak-proof wall when the sanitary napkin 1 is worn, and an adhesive portion 23 positioned on the surface of the non-skin-facing side of the liquid-impermeable sheet 7 that adhesively fixes the sanitary napkin 1 to the inner surface of the wearer's clothing, such as underwear.

[0031] In the sanitary napkin 1, the absorbent body 9 is formed of a water-absorbent material capable of absorbing bodily fluids, including menstrual blood, excreted from the wearer and passing through the skin-contact sheet 3. The absorbent body 9 includes an absorbent core 11 containing a superabsorbent polymer (not shown) and pulp fibers (not shown) as hydrophilic fibers, and a core wrap 13 covering the absorbent core 11 on both the skin-contact sheet 3 side and the liquid-impermeable sheet 7 side. The core wrap 13 is divided into a skin-side core wrap 13a covering the absorbent core 11 on the skin side, and a non-skin-side core wrap 13b covering the absorbent core 11 on the non-skin side. The skin-side core wrap 13a has a skin-side surface 15a that faces the skin, and a non-skin-side surface 15b that faces away from the skin. The absorbent core 11 contains a superabsorbent polymer and hydrophilic fibers such that the ratio of the superabsorbent polymer to the pulp fibers is 5% by mass or more.

[0032] The skin-contacting sheet 3 contains a blood slipping agent 31 on its skin-contacting surface 5a for transferring blood to the absorbent core. The skin-side core wrap 13a also contains an osmotic pressure adjuster 33 on its non-skin side 15b for adjusting the osmotic pressure of blood cell components in the blood. This allows the blood slipping agent 31 to more effectively exert its blood sliding action, and the osmotic pressure adjuster 33 to more effectively exert its adhesion-inhibiting action, resulting in the sanitary napkin 1 having excellent rewetting resistance against blood. Note that the blood slipping agent 31 is not shown in FIG. 1.

[0033] The absorbent article according to the present disclosure is not particularly limited as long as it comprises an absorbent body having an absorbent core and a liquid-permeable sheet arranged closer to the skin than the absorbent body and is for absorbing blood, and examples thereof include sanitary napkins, sanitary shorts, panty liners, tampons, bedsore pads, adhesive bandages, etc. The absorbent article according to the present disclosure may have a longitudinal direction, a width direction, and a thickness direction that are perpendicular to each other. The direction that includes the longitudinal direction and the width direction may also be referred to as a planar direction.

[0034] The liquid-permeable sheet is not particularly limited as long as it is used as a liquid-permeable sheet in the art, and examples thereof include nonwoven fabrics and woven fabrics. Examples of the liquid-permeable sheet include a skin-contact sheet having a skin-contact surface that contacts the user's skin, and a diffusion sheet (e.g., a "second sheet") disposed between the skin-contact sheet and the absorbent body, and the skin-contact sheet is preferred. This allows the blood slipping agent to accurately exhibit a blood-slipping effect on blood that has reached the skin-contact sheet, and the absorbent article has excellent rewet resistance against blood.

[0035] The absorbent body may be composed of only the absorbent core. The absorbent body may further include a core wrap sheet that covers the absorbent core from the skin-contacting sheet side and / or the liquid-impermeable sheet side. The core wrap sheets arranged on the skin-contacting sheet side and the liquid-impermeable sheet side are referred to as the skin-side core wrap sheet and the non-skin-side core wrap sheet, respectively.

[0036] The absorbent core contains a superabsorbent polymer and hydrophilic fibers such that the ratio of the superabsorbent polymer to the hydrophilic fibers is 5% by mass or more, preferably 10% by mass or more. The absorbent core also contains a superabsorbent polymer and hydrophilic fibers such that the ratio of the superabsorbent polymer to the hydrophilic fibers is preferably 70% by mass or less, more preferably 50% by mass or less, even more preferably 30% by mass or less, even more preferably 25% by mass or less, and even more preferably 20% by mass or less. This provides the absorbent article with excellent blood rewet resistance.

[0037] As used herein, the ratio of superabsorbent polymer to hydrophilic fiber is measured as follows. (1) A sample of the mixture of superabsorbent polymer and hydrophilic fiber is taken from the absorbent core, and the mass of the sample: m0 (g) is measured. (2) The sample is placed in a mesh bag (made of synthetic resin with mesh openings that do not allow hydrophilic fibers to pass through) with a mass of m1 (g), and the sample, along with the mesh bag, is immersed for 24 hours in an aqueous solution containing 4.0% by mass of ascorbic acid and 0.02% by mass of riboflavin relative to the mixture. Note that ascorbic acid is a component that promotes the reduction of the molecular weight of the superabsorbent polymer, and riboflavin is a component that colors the superabsorbent polymer and allows visual confirmation of the reduction of the molecular weight of the superabsorbent polymer.

[0038] (3) The sample is removed from the aqueous solution together with the mesh bag, and the sample is exposed to sunlight together with the mesh bag for 3 days to reduce the molecular weight of the superabsorbent polymer. The sample is then washed together with the mesh bag with water to remove the components that have been solubilized by the reduction in molecular weight of the superabsorbent polymer. If the color of the superabsorbent polymer colored by riboflavin does not disappear in the sample or if the slimy feeling after washing with water does not disappear, the mesh bag is immersed again in the above aqueous solution, and the reduction in molecular weight of the superabsorbent polymer by sunlight is repeated.

[0039] (4) After thoroughly rinsing the sample together with the mesh bag, the sample together with the mesh bag is centrifuged in a centrifuge (speed: 800 rpm, time: 10 minutes) to dehydrate the sample. After dehydration, the sample together with the mesh bag is dried at 90°C for 18 hours, and then left to stand at room temperature (25°C), after which the mass of the mesh bag containing the sample: m2 (g) is measured. (5) The ratio of the superabsorbent polymer to the hydrophilic fiber: R (mass%) is calculated using the following formula: R (mass%)=100×[m0-(m2-m1)] / (m2-m1) It is calculated as follows. (6) Measure R (mass%) five times for different samples, and use the average as the ratio of superabsorbent polymer to hydrophilic fiber.

[0040] The superabsorbent polymer can be any polymer used in the art without any particular limitation, and examples thereof include polymers or copolymers of (meth)acrylic acid or alkali metal salts of (meth)acrylic acid, and preferably polymers or copolymers of sodium (meth)acrylate. In this specification, (meth)acrylic acid refers to acrylic acid or methacrylic acid. In this specification, the superabsorbent polymer may be simply referred to as SAP.

[0041] The absorbent core contains the superabsorbent polymer, preferably at a concentration of 10 g / m 2 More preferably, 30 g / m 2 or more, and more preferably 50 g / m 2 The absorbent core preferably contains the superabsorbent polymer in a basis weight of 100 g / m or more. 2 The absorbent article has the following basis weight: This provides the absorbent article with excellent rewet resistance against blood.

[0042] The hydrophilic fibers may be, for example, fibers that are used in the art as having hydrophilic properties, such as absorbent fibers, e.g., cellulosic fibers, and non-absorbent fibers, e.g., synthetic fibers that have been treated to be hydrophilic. Examples of the cellulosic fibers include natural cellulose fibers, regenerated cellulose fibers, refined cellulose fibers, and semi-synthetic cellulose fibers. Examples of the natural cellulose fibers include plant fibers such as pulp fibers, seed hair fibers (for example, cotton fibers), bast fibers (for example, hemp), leaf vein fibers (for example, Manila hemp), and fruit fibers (for example, palm).

[0043] The pulp fibers include those known in the art, such as wood pulp fibers and non-wood pulp fibers. Examples of the wood pulp fibers include softwood pulp fibers and hardwood pulp fibers. Examples of the non-wood pulp fibers include straw pulp fibers, bagasse pulp fibers, reed pulp fibers, kenaf pulp fibers, mulberry pulp fibers, bamboo pulp fibers, hemp pulp fibers, and cotton pulp fibers (e.g., cotton linter fibers). The pulp fibers may be waste paper, recycled pulp fibers, or the like.

[0044] Examples of the cotton fiber include Hirsutum cotton fiber (for example, upland cotton), Barbadense cotton fiber, Arboreum cotton fiber, and Helbaceum cotton fiber. The cotton fiber may be organic cotton fiber or Pre-Organic Cotton (trademark) fiber. Organic cotton fiber means cotton that is certified by the Global Organic Textile Standard (GOTS).

[0045] Examples of the regenerated cellulose fibers include rayon, for example, viscose rayon obtained from viscose, polynosic and modal, and cuprammonium rayon (also called "cupra") obtained from a cuprammonium salt solution of cellulose.

[0046] The purified cellulose fiber may be lyocell, specifically, pulp, which is dissolved in an aqueous solution of N-methylmorpholine N-oxide to form a spinning dope (dope), and then extruded into a dilute solution of N-methylmorpholine N-oxide to form fibers. The purified cellulose is commercially available, for example, under the trademark Tencel. The semi-synthetic fibers include semi-synthetic cellulose fibers such as acetate fibers, for example, triacetate and diacetate fibers.

[0047] The absorbent article according to the present disclosure may further comprise a liquid-impermeable sheet arranged on the non-skin side of the absorbent body, a diffusion sheet (e.g., a "third sheet") arranged between the absorbent body and the liquid-impermeable sheet, and the like.

[0048] In the absorbent article according to the present disclosure, the liquid-permeable sheet contains a blood slipping agent for transferring blood to the absorbent body, thereby enabling the blood slipping agent to exhibit a blood sliding effect.

[0049] The blood slipping agent preferably has a viscosity of 0.01 mm at 40°C. 2 / s or more, preferably 1 mm 2 / s or more, more preferably 3 mm 2 / s or more, and even more preferably 5 mm 2 / s or more, and even more preferably 7 mm 2 The blood slipping agent preferably has a kinematic viscosity of 80 mm / s or more at 40°C. 2 / s or less, preferably 70 mm 2 / s or less, more preferably 60 mm 2 / s or less, and even more preferably 50 mm 2 / s or less, and even more preferably 45 mm 2 / s or less.

[0050] In addition, the blood slipping agent has a viscosity of 0.01 to 80 mm at 40°C. 2In order to have a kinematic viscosity of 1 / s, the melting point of the blood slipping agent is preferably 45°C or lower. If the blood slipping agent contains crystals at 40°C, the kinematic viscosity tends to increase. In this specification, the kinematic viscosity at 40°C may be simply referred to as "kinematic viscosity." The above kinematic viscosity is 80mm 2 If it exceeds 1 / s, the viscosity of the blood slipping agent will be high, and it will tend to be difficult for the agent to slide down from the liquid-permeable sheet to the absorbent body together with the menstrual blood.

[0051] The kinematic viscosity can be measured at a test temperature of 40°C using a Cannon-Fenske reverse flow viscometer in accordance with JIS K 2283:2000, "5. Kinematic viscosity test method."

[0052] The blood slipping agent has a water holding percentage of preferably 0.01% by mass or more, more preferably 0.02% by mass or more, even more preferably 0.03% by mass or more, even more preferably 0.04% by mass or more, and even more preferably 0.05% by mass or more. The blood slipping agent also has a water holding percentage of preferably 4.0% by mass or less, more preferably 3.5% by mass or less, even more preferably 3.0% by mass or less, even more preferably 2.5% by mass or less, and even more preferably 2.0% by mass or less.

[0053] As used herein, "water holding capacity" means the proportion of water that a substance can hold, and can be measured as follows. (1) Place the test tube, rubber stopper, substance to be measured, and deionized water in a thermostatic chamber at 40°C overnight. (2) In the temperature-controlled room, 5.0 g of the substance to be measured and 5.0 g of deionized water are placed in a 20 mL test tube. (3) In the above-mentioned temperature-controlled room, the mouth of the test tube is plugged with a rubber stopper, rotated once, and left to stand for 5 minutes.

[0054] (4) In the constant temperature room, 3.0 g of the layer of the substance to be measured (usually the upper layer) is collected in a glass petri dish with a diameter of 90 mm (mass: W0). (5) The above-mentioned petri dish is heated in an oven at 105°C for 3 hours to evaporate the water, and the mass of the petri dish is measured (mass: W1). (6) Calculate the water holding rate according to the following formula. Water retention rate (mass%)=100×(W0-W1) / 3.0 The measurement is carried out three times and the average value is used.

[0055] The blood slipping agent preferably has a weight-average molecular weight of less than 1,000, and more preferably less than 900. If the weight-average molecular weight is 1,000 or more, the blood slipping agent itself tends to become tacky, causing discomfort to the user. The blood slipping agent preferably has a weight-average molecular weight of 100 or more, and more preferably a weight-average molecular weight of 200 or more. If the weight-average molecular weight is small, the vapor pressure of the blood slipping agent increases, which can lead to evaporation during storage, resulting in a decrease in amount and problems such as odor when worn.

[0056] In this specification, the term "weight average molecular weight" is a concept that includes polydisperse compounds (for example, compounds produced by sequential polymerization, esters produced from a plurality of fatty acids and a plurality of aliphatic monohydric alcohols) and single compounds (for example, esters produced from one type of fatty acid and one type of aliphatic monohydric alcohol). i Molecular weight M i In a system consisting of molecules (i=1, or i=1,2...), the following formula: M w =ΣN i M i 2 / ΣN i M i M obtained by w means.

[0057] In this specification, the weight average molecular weight means a value calculated as polystyrene equivalent, determined by gel permeation chromatography (GPC). The GPC measurement conditions are, for example, as follows. Model: Hitachi High-Technologies Corporation High-Performance Liquid Chromatogram Lachrom Elite Column: SHODEX KF-801, KF-803, and KF-804 manufactured by Showa Denko K.K. Eluent:THF Flow rate: 1.0mL / min Injection amount: 100μL Detection: RI (differential refractometer)

[0058] Examples of the blood slipping agent include (a1) esters of chain hydrocarbon tetraols and at least one fatty acid, (a2) esters of chain hydrocarbon triols and at least one fatty acid, (a3) ​​esters of chain hydrocarbon diols and at least one fatty acid, (b1) ethers of chain hydrocarbon tetraols and at least one aliphatic monohydric alcohol, (b2) ethers of chain hydrocarbon triols and at least one aliphatic monohydric alcohol, (b3) ethers of chain hydrocarbon diols and at least one aliphatic monohydric alcohol, (c1) esters of chain hydrocarbon tetracarboxylic acids, hydroxy acids, alkoxy acids or oxo acids having four carboxyl groups and at least one aliphatic monohydric alcohol, (c2) esters of chain hydrocarbon tricarboxylic acids having three carboxyl groups and at least one aliphatic monohydric alcohol, (c3) esters of chain hydrocarbon tricarboxylic acids having three carboxyl groups and at least one aliphatic monohydric alcohol, (c4) esters of chain hydrocarbon tricarboxylic acids having three carboxyl groups and at least one aliphatic monohydric alcohol, (c5) esters of chain hydrocarbon tricarboxylic acids having three carboxyl groups and at least one aliphatic monohydric alcohol, (c6) esters of chain hydrocarbon tricarboxylic acids having three carboxyl groups and at least one aliphatic monohydric alcohol, (c7) esters of chain hydrocarbon tricarboxylic acids having three carboxyl groups and at least one aliphatic monohydric alcohol, (c8) esters of chain hydrocarbon tricarboxylic acids having three carboxyl groups and at least one aliphatic monohydric alcohol, (c9) esters of chain hydrocarbon tricarboxylic acids having three carboxyl groups and at least one aliphatic monohydric alcohol, (c10) esters of chain hydrocarbon tetracarboxylic acids having four carboxyl groups and at least one aliphatic monohydric alcohol, (c11) esters of chain hydrocarbon tetracarboxylic acids having four carboxyl groups and at least one a (c3) esters of linear hydrocarbon dicarboxylic acids, hydroxy acids, alkoxy acids or oxo acids having two carboxyl groups and at least one aliphatic monohydric alcohol, (d1) ethers of linear hydrocarbon dicarboxylic acids, hydroxy acids, alkoxy acids or oxo acids having two carboxyl groups and at least one aliphatic monohydric alcohol, (d2) dialkyl ketones, (d3) esters of fatty acids and aliphatic monohydric alcohols, (d4) dialkyl carbonates, (e1) polyoxy C3-C6 alkylene glycols, (e2) esters of polyoxy C3-C6 alkylene glycols and at least one fatty acid, (e3) ethers of polyoxy C3-C6 alkylene glycols and at least one aliphatic monohydric alcohol, and (f1) linear alkanes.

[0059] [(a1) Ester of a chain hydrocarbon tetraol and at least one fatty acid] (a1) Examples of the ester of a chain hydrocarbon tetraol and at least one fatty acid include a tetraester of pentaerythritol and a fatty acid, a triester of pentaerythritol and a fatty acid, a diester of pentaerythritol and a fatty acid, and a monoester of pentaerythritol and a fatty acid.

[0060] The fatty acids include, for example, saturated fatty acids, such as C2 to C 30 saturated fatty acids such as acetic acid (C2) (C2 means the number of carbon atoms, the same applies hereinafter), propanoic acid (C3), butanoic acid (C4) and its isomers, such as 2-methylpropanoic acid (C4), pentanoic acid (C5) and its isomers, such as 2-methylbutanoic acid (C5), 2,2-dimethylpropanoic acid (C5), hexanoic acid (C6), heptanoic acid (C7), octanoic acid (C8) and its isomers, such as 2-ethylhexanoic acid (C8), nonanoic acid (C9), decanoic acid (C 10 ), dodecanoic acid (C 12 ), tetradecanoic acid (C 14 ), hexadecanoic acid (C 16 ), heptadecanoic acid (C 17 ), octadecanoic acid (C 18 ), eicosanoic acid (C 20 ), docosanoic acid (C 22 ), tetracosanoic acid (C 24 ), hexacosanoic acid (C 26 ), octacosanoic acid (C 28 ), triacontanoic acid (C 30 ) etc., as well as unlisted isomers thereof.

[0061] The fatty acid may also be an unsaturated fatty acid. Examples of the unsaturated fatty acid include C3 to C 20 unsaturated fatty acids, such as monounsaturated fatty acids, for example, crotonic acid (C4), myristoleic acid (C 14 ), palmitoleic acid (C 16 ), oleic acid (C 18 ), elaidic acid (C18 ), vaccenic acid (C 18 ), gadoleic acid (C 20 ), eicosenoic acid (C 20 ), diunsaturated fatty acids, such as linoleic acid (C 18 ), eicosadienoic acid (C 20 ), triunsaturated fatty acids, such as linolenic acid, e.g., α-linolenic acid (C 18 ) and γ-linolenic acid (C 18 ), pinolenic acid (C 18 ), eleostearic acid, e.g., α-eleostearic acid (C 18 ) and β-eleostearic acid (C 18 ), mead acid (C 20 ), dihomo-γ-linolenic acid (C 20 ), eicosatrienoic acid (C 20 ) and tetraunsaturated fatty acids, such as stearidonic acid (C 20 ), arachidonic acid (C 20 ), eicosatetraenoic acid (C 20 ), etc., pentaunsaturated fatty acids, such as boseopentaenoic acid (C 18 ), eicosapentaenoic acid (C 20 ) and the like, as well as partial hydrogen adducts thereof.

[0062] Considering the possibility of denaturation due to oxidation or the like, the above-mentioned ester of pentaerythritol and fatty acid is preferably an ester of pentaerythritol and fatty acid derived from saturated fatty acid, i.e., an ester of pentaerythritol and saturated fatty acid. Furthermore, from the viewpoint of reducing the water holding percentage, the ester of pentaerythritol and a fatty acid is preferably a diester, triester, or tetraester, more preferably a triester or tetraester, and even more preferably a tetraester.

[0063] Commercially available products of the above-mentioned esters of pentaerythritol and fatty acids include Unistar H-408BRS and H-2408BRS-22 (mixture) (both manufactured by NOF Corporation).

[0064] [(a2) Ester of a chain hydrocarbon triol and at least one fatty acid] (a2) Examples of the ester of a chain hydrocarbon triol and at least one fatty acid include triesters of glycerin and fatty acids, diesters of glycerin and fatty acids, and monoesters of glycerin and fatty acids.

[0065] The fatty acids are as described above. The ester of glycerin and fatty acid is preferably a diester or triester, more preferably a triester, from the viewpoint of reducing the water holding percentage.

[0066] Examples of the triesters of glycerin and two or more fatty acids include triesters of glycerin and octanoic acid (C8) and decanoic acid (C 10 ), triester of glycerin, octanoic acid (C8), decanoic acid (C 10 ) and dodecanoic acid (C 12 ), triester of glycerin, octanoic acid (C8), decanoic acid (C 10 ), dodecanoic acid (C 12 ), tetradecanoic acid (C 14 ), hexadecanoic acid (C 16 ) and octadecanoic acid (C 18 ) triesters, etc.

[0067] From the viewpoint of achieving a melting point of 45°C or less, the triester of glycerin and a fatty acid preferably has a total carbon number of about 40 or less of the fatty acids constituting the triester of glycerin and a fatty acid.

[0068] Commercially available triesters of glycerin and fatty acids include tri-coconut oil fatty acid glyceride, NA36, Panasate 800, Panasate 800B, and Panasate 810S, as well as tri-C2L oil fatty acid glyceride and tri-CL oil fatty acid glyceride (all manufactured by NOF Corporation), olive oil, etc.

[0069] [(a3) Ester of a chain hydrocarbon diol and at least one fatty acid] (a3) Examples of the esters of a chain hydrocarbon diol and at least one fatty acid include monoesters or diesters of a fatty acid with a C2 to C6 chain hydrocarbon diol, such as a C2 to C6 glycol, for example, ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, or hexylene glycol.

[0070] Examples of the fatty acid include the fatty acids listed in "(a1) Esters of chain hydrocarbon tetraols and at least one fatty acid." Considering the possibility of denaturation due to oxidation or the like, the ester of the C2 to C6 glycol and fatty acid is preferably an ester of the C2 to C6 glycol and fatty acid derived from saturated fatty acid, i.e., an ester of the C2 to C6 glycol and saturated fatty acid.

[0071] Furthermore, from the viewpoint of reducing the water holding percentage, the ester of the C2 to C6 glycol and fatty acid is preferably an ester of a glycol and fatty acid derived from a glycol with a large carbon number, for example, an ester of a glycol and fatty acid derived from butylene glycol, pentylene glycol, or hexylene glycol. Furthermore, the ester of the C2 to C6 glycol and fatty acid is preferably a diester from the viewpoint of reducing the water holding percentage. Examples of commercially available products of the esters of C2 to C6 glycols and fatty acids include Compol BL and Compol BS (both manufactured by NOF Corporation).

[0072] [(b1) Ether of a chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol] (b1) Examples of the ethers of chain hydrocarbon tetraols and at least one aliphatic monohydric alcohol include tetraethers, triethers, diethers, and monoethers of pentaerythritol and aliphatic monohydric alcohols.

[0073] Examples of the aliphatic monohydric alcohol include saturated aliphatic monohydric alcohols and unsaturated aliphatic monohydric alcohols. Examples of the saturated aliphatic monohydric alcohol include C1 to C 20 saturated aliphatic monohydric alcohols such as methyl alcohol (C1) (C1 indicates the number of carbon atoms, the same applies hereinafter), ethyl alcohol (C2), propyl alcohol (C3) and its isomers, such as isopropyl alcohol (C3), butyl alcohol (C4) and its isomers, such as sec-butyl alcohol (C4) and tert-butyl alcohol (C4), pentyl alcohol (C5), hexyl alcohol (C6), heptyl alcohol (C7), octyl alcohol (C8) and its isomers, such as 2-ethylhexyl alcohol (C8), nonyl alcohol (C9), decyl alcohol (C 10 ), dodecyl alcohol (C 12 ), tetradecyl alcohol (C 14 ), hexadecyl alcohol (C 16 ), hepradecyl alcohol (C 17 ), octadecyl alcohol (C 18 ), and eicosyl alcohol (C 20 ), as well as unlisted isomers thereof.

[0074] Examples of the unsaturated aliphatic monohydric alcohol include those in which one of the C═C single bonds of the saturated aliphatic monohydric alcohols is substituted with a C═C double bond, such as oleyl alcohol, which is commercially available from New Japan Chemical Co., Ltd. under the names of the Rikacol series and the Angecool series.

[0075] [(b2) an ether of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol, (b2) Examples of the ethers of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol include triethers, diethers, and monoethers of glycerin and an aliphatic monohydric alcohol. The aliphatic monohydric alcohol is as described above.

[0076] [(b3) Ethers of Chain Hydrocarbon Diols and at Least One Aliphatic Monohydric Alcohol] (b3) Examples of the ethers of chain hydrocarbon diols and at least one aliphatic monohydric alcohol include diethers of C2 to C6 glycols and aliphatic monohydric alcohols, and monoethers of C2 to C6 glycols and aliphatic monohydric alcohols. The aliphatic monohydric alcohol is as described above.

[0077] [(c1) Esters of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol] (c1) Examples of the esters of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol include monoesters, diesters, triesters, and tetraesters of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol, preferably diesters, triesters, and tetraesters, more preferably triesters and tetraesters, and even more preferably tetraesters.

[0078] Examples of the chain hydrocarbon tetracarboxylic acid include alkanetetracarboxylic acids such as butanetetraoic acid, pentanetetraoic acid, hexanetetraoic acid, heptanetetraoic acid, octanetetraoic acid, nonanetetraoic acid, and decanetetraoic acid. The aliphatic monohydric alcohol is as described above.

[0079] [(c2) Esters of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having three carboxyl groups and at least one aliphatic monohydric alcohol] (c2) Examples of the esters of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having three carboxyl groups and at least one aliphatic monohydric alcohol include monoesters, diesters, and triesters, preferably diesters and triesters, and more preferably triesters, of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having three carboxyl groups and at least one aliphatic monohydric alcohol.

[0080] Examples of the chain hydrocarbon tricarboxylic acid include alkane tricarboxylic acids such as propane triacid, butane triacid, pentane triacid, hexane triacid, heptane triacid, octane triacid, nonane triacid, and decane triacid. The aliphatic monohydric alcohol is as described above. An example is tributyl O-acetylcitrate, which is commercially available.

[0081] [(c3) Esters of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol] (c3) Examples of the esters of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol include monoesters and diesters, preferably diesters, of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol.

[0082] Examples of the chain hydrocarbon dicarboxylic acid include alkane dicarboxylic acids such as ethanedioic acid, propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, octanedioic acid, nonanedioic acid, and decanedioic acid. The aliphatic monohydric alcohol is as described above. An example is dioctyl adipate, which is commercially available.

[0083] [(d1) Ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol] The ether of the aliphatic monohydric alcohol and the aliphatic monohydric alcohol may be an ether of the following formula (1): R 1 OR 2 (1) (In the formula, R 1 and R 2 Each of these is a chain hydrocarbon. Examples of the compound include compounds having the formula: The aliphatic monohydric alcohol constituting the ether (in formula (1), R 1 OH and R 2 The groups corresponding to OH are as described above.

[0084] [(d2) Dialkyl ketone] The dialkyl ketone may be selected from the group consisting of ketones represented by the following formula (2): R 3 COR 4 (2) (In the formula, R 3 and R 4 each of which is an alkyl group Examples of the compound include compounds having the formula: The dialkyl ketones are commercially available, or can be obtained by known methods, for example, by oxidizing a secondary alcohol with chromic acid or the like.

[0085] [(d3) Ester of fatty acid and aliphatic monohydric alcohol] Examples of the ester of the fatty acid and the aliphatic monohydric alcohol include those represented by the following formula (3): R 5 COOR 6 (3) (In the formula, R 5 and R 6 are chain hydrocarbons) Examples of the compound include compounds having the formula:

[0086] The fatty acid constituting the ester (in formula (3), R 5The aliphatic monohydric alcohol (corresponding to R COOH in formula (3)) constituting the ester may be the above-mentioned fatty acid, and saturated fatty acid is preferred in view of the possibility of denaturation due to oxidation or the like. 6 Examples of the alkyl group (corresponding to OH) include the above-mentioned aliphatic monohydric alcohols.

[0087] Examples of the esters of the fatty acids and aliphatic monohydric alcohols include dodecanoic acid (C 12 ) and dodecyl alcohol (C 12 ), ester with tetradecanoic acid (C 14 ) and dodecyl alcohol (C 12 ) and the like, and examples of commercially available esters of the above fatty acids and aliphatic monohydric alcohols include Electol WE20 and Electol WE40 (both manufactured by NOF Corporation).

[0088] [(d4) Dialkyl carbonate] The dialkyl carbonate may be a compound represented by the following formula (4): R 7 OC(=O)OR 8 (4) (In the formula, R 7 and R 8 each of which is an alkyl group Examples of the compound include compounds having the formula: The above dialkyl carbonates are commercially available, or can be synthesized by the reaction of phosgene with an alcohol, the reaction of a chloroformate with an alcohol or an alcoholate, or the reaction of silver carbonate with an alkyl iodide.

[0089] [(e1) Polyoxy C3-C6 alkylene glycol] The polyoxy C3-C6 alkylene glycol means i) a homopolymer having an oxy C3-C6 alkylene skeleton, that is, any one skeleton selected from the group consisting of an oxypropylene skeleton, an oxybutylene skeleton, an oxypentylene skeleton, and an oxyhexylene skeleton, and having hydroxy groups at both ends; ii) a block copolymer having two or more skeletons selected from the above group and having hydroxy groups at both ends; or iii) a random copolymer having two or more skeletons selected from the above group and having hydroxy groups at both ends. Commercially available products of the poly C3-C6 alkylene glycol include, for example, Uniol (trademark) PB-500 and PB-700 (both manufactured by NOF Corporation).

[0090] [(e2) Ester of polyoxy C3-C6 alkylene glycol and at least one fatty acid] Examples of the ester of the polyoxy C3-C6 alkylene glycol and at least one fatty acid include those in which one or both OH terminals of the polyoxy C3-C6 alkylene glycol explained in the section "(e1) Polyoxy C3-C6 alkylene glycol" are esterified with a fatty acid, i.e., monoesters and diesters. The fatty acids are as described above.

[0091] [(e3) Ether of polyoxy C3-C6 alkylene glycol and at least one aliphatic monohydric alcohol] Examples of the ethers of the polyoxy C3-C6 alkylene glycol and at least one aliphatic monohydric alcohol include those in which one or both of the OH terminals of the polyoxy C3-C6 alkylene glycol explained in the section "(e1) Polyoxy C3-C6 alkylene glycol" are etherified with an aliphatic monohydric alcohol, i.e., monoethers and diethers. The aliphatic monohydric alcohol is as described above.

[0092] [(f1) Chain alkanes] (f1) Examples of chain alkanes include linear alkanes and branched alkanes. Commercially available products of the above hydrocarbons include, for example, Parleam 6 (NOF Corporation).

[0093] In the absorbent article according to the present disclosure, the liquid-permeable sheet contains the blood slipping agent in an amount of 1.0 g / m 2 or more, preferably 1.5 g / m 2 or more, and more preferably 2.0 g / m 2 In the absorbent article according to the present disclosure, the liquid-permeable sheet contains the blood slipping agent in an amount of 10.0 g / m or more. 2 or less, preferably 7.0 g / m 2 or less, and more preferably 5.0 g / m 2 The blood slipping agent is contained in the following basis weight: This allows the blood slipping agent to properly exhibit its blood sliding effect, and the absorbent article has excellent rewet resistance against blood. As described above, the liquid-permeable sheet may be a skin-contacting sheet having a skin-contacting surface that contacts the skin of the user, a second sheet, or the like, and is preferably a skin-contacting sheet.

[0094] The absorbent articles according to the present disclosure contain the blood slipping agent in a basis weight of 0.005 g or more, preferably 0.008 g or more, and more preferably 0.010 g or more per absorbent article. The absorbent articles according to the present disclosure also contain the blood slipping agent in a basis weight of 0.050 g or less, preferably 0.035 g or less, and more preferably 0.025 g or less. This allows the blood slipping agent to adequately exert its blood sliding effect, and the absorbent articles have excellent rewetting resistance against blood.

[0095] In the absorbent article according to the present disclosure, the blood slipping agent can be disposed on the skin-side surface (in the case of a skin-contacting sheet, on the skin-contacting surface), inside, and / or on the non-skin-side surface (in the case of a skin-contacting sheet), of the liquid-permeable sheet, and is preferably disposed on the skin-side surface, which allows the blood slipping agent to exhibit its blood-sliding effect more quickly.

[0096] The absorbent article according to the present disclosure may include the blood slipping agent at any position in the planar direction, and preferably includes the agent at least in the excretory opening contact area, from the viewpoint of the effectiveness of the blood slipping agent.

[0097] The absorbent article preferably includes the blood slipping agent so as to overlap the osmotic pressure adjuster in the thickness direction, thereby enabling the blood slipping agent to rapidly exert its blood sliding action and the osmotic pressure adjuster to rapidly exert its adhesion inhibitory action, resulting in excellent rewetting resistance against blood for the absorbent article. In the absorbent article according to the present disclosure, a material disposed closer to the skin than the absorbent core, for example, a skin-side core wrap sheet, may further comprise the blood slipping agent.

[0098] The absorbent article according to the present disclosure includes an osmotic pressure adjuster for adjusting the osmotic pressure of blood cell components in the blood. The osmotic pressure adjuster adjusts the osmotic pressure of blood cell components (such as red blood cells, white blood cells, and platelets) in the blood, dehydrating and shrinking the blood cell components to deform them (i.e., shrinking and deforming the blood cell components), making it difficult for blood cell components attached to the surface of the superabsorbent polymer to adhere to each other, ensuring a blood passage between the blood cell components and promoting fluid migration to the superabsorbent polymer (i.e., exhibiting an effect of inhibiting adhesion between blood cell components).

[0099] The osmotic pressure adjuster is not particularly limited as long as it has an osmotic pressure adjusting effect of adjusting the osmotic pressure of blood cell components in blood (blood cells such as red blood cells, white blood cells, and platelets), and examples thereof include chemical substances called osmolytes, more specifically, neutral zwitterions, sugars, polyhydric alcohols, methylammoniums, sulfoniums, and cyclic carboxylic acid esters (e.g., glucuronolactone).

[0100] Such an osmotic pressure adjusting agent can dehydrate and shrink blood cell components in blood by adjusting the osmotic pressure. This causes the blood cell components in blood to shrink unevenly, making it difficult for the blood cell components attached to the surface of the superabsorbent polymer to bond together. It is known that red blood cells, one of the blood cell components, change their shape due to changes in osmotic pressure, pH, mechanical stress, etc., making them less likely to bond together and form aggregates.

[0101] In the present invention, the osmotic pressure adjuster is not particularly limited as long as it has the osmotic pressure adjusting effect as described above, but preferably contains at least one component selected from the group consisting of neutral zwitterions, sugars, and polyhydric alcohols. When the osmotic pressure adjuster contains such a specific component, it can more effectively exert the above-mentioned effect of inhibiting the adhesion of blood cell components to each other.

[0102] The neutral zwitterions that can be used in the osmotic pressure adjuster are not particularly limited as long as they have the above-mentioned osmotic pressure adjusting effect, and examples thereof include amino acids such as taurine, betaine, serine, glycine, glycylglycine, tricine, L-phenylalanine, creatine, and arginine, sulfobetaine, etc. These zwitterions may be used alone or in combination of two or more. Among the above zwitterions, it is preferable to use amino acids with relatively small molecular weights, such as glycine (molecular weight 75), serine (molecular weight 105), and betaine (molecular weight 117), because they are effective in increasing osmotic pressure even when added in small amounts.

[0103] The sugars that can be used in the osmotic pressure adjuster are not particularly limited as long as they have the above-mentioned osmotic pressure adjusting effect, and examples thereof include monosaccharides such as glucose, fructose, galactose, mannose, xylose, erythrose, etc., and disaccharides such as sucrose, etc. These sugars may be used alone or in combination of two or more. Among the above sugars, it is preferable to use sugars having 4 or more carbon atoms, such as glucose, fructose, galactose, mannose, xylose, erythrose, and sucrose, because they have the advantage of being able to easily obtain the osmotic pressure adjusting effect described above.

[0104] The polyhydric alcohols that can be used in the osmotic pressure adjuster are not particularly limited as long as they have the above-mentioned osmotic pressure adjusting effect, and examples thereof include sugar alcohols such as sorbitol, mannitol, xylitol, erythritol, etc., cyclitols such as inositol, lower alcohols such as propylene glycol, etc. These polyhydric alcohols may be used alone or in combination of two or more. Among the above polyhydric alcohols, it is preferable to use polyhydric alcohols having 4 or more carbon atoms, such as sorbitol, mannitol, xylitol, erythritol, and inositol, because they can easily achieve the above-mentioned osmotic pressure adjusting effect.

[0105] In the present disclosure, the osmotic pressure adjuster preferably has a solubility of 8 g / 100 g or more in 100 g of ion-exchanged water at 25° C. Examples of osmotic pressure adjusters with such a solubility include taurine, betaine, serine, glycine, glycylglycine, tricine, glucose, fructose, galactose, mannose, xylose, erythrose, sorbitol, mannitol, xylitol, and erythritol. When an osmotic pressure adjuster has a solubility above a certain level, it dissolves easily in blood and can more reliably adjust the osmotic pressure of blood cell components, thereby more reliably exerting the aforementioned inhibitory effect on the adhesion of blood cell components to each other.

[0106] The solubility of the osmotic pressure adjuster in 100 g of ion-exchanged water at 25° C. is more preferably 10 g / 100 g or more, and even more preferably 25 g / 100 g or more, and more preferably 72 g / 100 g or less, and even more preferably 36 g / 100 g or less.

[0107] In particular, when the solubility of the osmotic pressure adjuster in 100 g of ion-exchanged water at 25°C is in the range of 10 g / 100 g to 72 g / 100 g, the above-mentioned effect of inhibiting the adhesion of blood cell components to each other can be more reliably exhibited. Furthermore, since an osmotic pressure adjuster with such a specific solubility is likely to leave a certain amount of osmotic pressure adjuster remaining after the first absorption of menstrual blood, the remaining osmotic pressure adjuster can still exert the above-mentioned effect of inhibiting the adhesion of blood cell components to each other even when repeatedly absorbing menstrual blood from the second absorption onwards. Therefore, absorbent articles containing osmotic pressure adjusters with such a specific solubility can more reliably exhibit the above-mentioned excellent absorption performance for a long period of time.

[0108] In the present disclosure, the osmotic pressure adjuster preferably contains an uncharged component. An uncharged component refers to a component that is not biased between positive and negative charges, and examples of such components include taurine, betaine, serine, glycine, glycylglycine, tricine, glucose, fructose, galactose, mannose, xylose, erythrose, sorbitol, mannitol, xylitol, and erythritol. When the osmotic pressure adjuster contains such an uncharged component, it can more effectively exert the aforementioned inhibitory effect on the adhesion of blood cell components to each other.

[0109] Among the above components, those containing glycine are particularly preferred. When the osmotic pressure adjuster contains glycine, the above-mentioned action of inhibiting the adhesion of blood cell components to each other can be more effectively and repeatedly exerted. Therefore, absorbent articles containing such osmotic pressure adjusters can exhibit superior absorption performance for a long period of time.

[0110] The osmotic pressure adjusting agent may be disposed on any material constituting the absorbent article, and may be disposed on the skin side, interior, and / or non-skin side of the material.

[0111] Examples of the material include a skin-contacting sheet, a second sheet, an absorbent, a third sheet, and a liquid-impermeable sheet. Examples of the absorbent include an absorbent core and a core wrap sheet, such as a skin-side core wrap sheet disposed on the skin side of the absorbent core and a non-skin-side core wrap sheet disposed on the non-skin side of the absorbent. The material is preferably an absorbent, and more preferably a skin-side core wrap sheet. This allows the material to more accurately exert its adhesion-inhibiting effect before blood reaches the superabsorbent polymer that constitutes the absorbent core.

[0112] In the absorbent article, the liquid-permeable sheet disposed closer to the skin than the absorbent core may contain the osmotic pressure adjuster, thereby more effectively suppressing adhesion before blood reaches the superabsorbent polymer constituting the absorbent core.

[0113] The osmotic pressure adjuster may be provided at any position on the material in the planar direction, and is preferably provided at least in the excretory opening contact area of ​​the material, from the viewpoint of the effect of the osmotic pressure adjuster.

[0114] The absorbent article preferably includes the osmotic pressure adjuster so as to overlap the blood slipping agent in the thickness direction, thereby enabling the blood slipping agent to rapidly exert its blood sliding action and the osmotic pressure adjuster to rapidly exert its adhesion suppression action, resulting in excellent rewetting resistance against blood for the absorbent article.

[0115] In the absorbent article according to the present disclosure, the blood slipping agent is preferably disposed closer to the skin than the osmotic pressure adjuster in the thickness direction, which allows the blood slipping agent to quickly exert its blood sliding effect, and then the osmotic pressure adjuster to quickly and accurately exert its adhesion-inhibiting effect, resulting in excellent rewetting resistance against blood in the absorbent article.

[0116] In the absorbent article according to the present disclosure, the absorbent core contains an osmotic pressure adjusting agent in an amount of preferably 0.08 g or more, more preferably 0.12 g or more, and even more preferably 0.50 g or more per absorbent article. Furthermore, in the absorbent article according to the present disclosure, the absorbent core contains an osmotic pressure adjusting agent in an amount of preferably 1.00 g or less, more preferably 0.70 g or less, and even more preferably 0.50 g or less per absorbent article. This allows the osmotic pressure adjusting agent to exert its adhesion-inhibiting effect for a long period of time, and the absorbent article has excellent rewet resistance against blood for a long period of time.

[0117] In the absorbent articles according to the present disclosure, the amount of the osmotic pressure adjuster per absorbent article is preferably greater than the amount of the blood slipping agent (preferably at least 1.0 times the amount of the blood slipping agent), more preferably at least 1.6 times, and even more preferably at least 2.4 times. Furthermore, in the absorbent articles according to the present disclosure, the amount of the osmotic pressure adjuster per absorbent article is preferably no more than 20.0 times, and more preferably no more than 14.0 times. This allows the blood slipping agent to exert its blood-sliding effect while the osmotic pressure adjuster can adequately exert its adhesion-inhibiting effect. [Example]

[0118] [Manufacturing Example 1] Skin contact sheet (air-through nonwoven fabric, basis weight: 22 g / m 2 ), Second sheet (Air-through nonwoven fabric, basis weight: 25g / m 2 ), skin side core wrap sheet (tissue, basis weight: 14g / m 2 ), absorbent core, non-skin side core wrap sheet (tissue, basis weight: 14g / m 2 ), and liquid-impermeable sheet (polyethylene non-moisture-permeable film, basis weight: 23.5 g / m 2 ) were bonded in that order with a hot melt adhesive to form simple sanitary napkin No. 1.

[0119] The skin-contact sheet, second sheet, skin-side core wrap sheet, absorbent body, non-skin-side core wrap sheet, and liquid-impermeable sheet all had dimensions of 100 mm x 50 mm (longitudinal x transverse). The absorbent core had dimensions of 70 mm x 20 mm (longitudinal x transverse) and was divided into a bulky section located in the center and a non-bulky section located around the bulky section. The bulky section was made of softwood pulp fiber (basis weight: 400 g / m2). 2 ) and sodium polyacrylate-based superabsorbent polymer (basis weight: 20 g / m 2 The ratio of superabsorbent polymer to softwood pulp fiber (hereinafter referred to as "SAP ratio") was 5% by mass. The non-bulky portion was made of pulp fiber (basis weight: 200 g / m 2 ) and sodium polyacrylate-based superabsorbent polymer (basis weight: 10 g / m 2 ), and the SAP ratio was 5 mass%.

[0120] The skin-contacting surface of the skin-contacting sheet was coated with a glycerin and fatty acid triester (Olive Oil, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) at a concentration of 3.0 g / m2, measuring 100 mm x 50 mm (longitudinal x transverse). 2 and was applied in an amount of 0.015 g per simple sanitary napkin No. 1. In addition, glycine was applied as an osmotic pressure adjuster to the center of the non-skin side of the skin-side core wrap sheet, with a size of 70 x 20 mm (longitudinal x transverse) and an amount of 0.36 g per product (0.36 g / p).

[0121] [Manufacturing Examples 2 to 24] Sanitary napkins Nos. 2 to 24 were produced in the same manner as in Production Example 1, except that the absorbent core, blood slipping agent, and osmotic pressure adjusting agent were changed as shown in Table 1. In each of the simple sanitary napkins No. 1 to No. 24, the SAP ratio in the bulky portion and the non-bulky portion of the absorbent core is the same.

[0122] [Example 1] For simple sanitary napkins Nos. 1 to 24, the rewet amount and the rewet amount reduction rate were measured while changing the amount of defibered horse blood depending on the SAP ratio. The results are shown in Table 1. The rewet amount and the rewet amount reduction rate were measured as follows.

[0123] <Method for measuring rewet amount and rewet amount reduction rate> (1) Using a water bath, a bottle containing defibrinated horse blood (Japan Bioserum) is maintained at 37°C. (2) An acrylic jig with an opening is placed on top of the simple sanitary napkin. The acrylic jig is 100 mm x 50 mm (longitudinal x transverse) in size and has a 40 mm x 10 mm (longitudinal x transverse) opening in the center. (3) Measure the initial mass A (g) (approximately 2 g) of the filter paper (50 mm x 35 mm). (4) After slowly shaking the bottle containing the defiberized horse blood up and down to mix it, measure out x mL (first time) of defiberized horse blood with a micropipette and inject it into the acrylic jig from a position 5 mm above the center of the opening over approximately 2 seconds.

[0124] (5) After injecting the defibrated horse blood, let it stand for 30 seconds. (6) If desired, in the same manner as in (4), x (mL, second time) of defibrinated horse blood is poured into a simple sanitary napkin and allowed to stand for 30 seconds. (7) If desired, in the same manner as in (4), x (mL, third time) of defibrinated horse blood is poured into a simple sanitary napkin and allowed to stand for 30 seconds. (8) After the simple sanitary napkin has absorbed the first to third doses of de-fibered horse blood, remove the acrylic jig. (9) After the first to third injections of defibrinated horse blood have been completed and the time has elapsed (y minutes), place a filter paper centered on the drip site, and then place a weight (50 mm x 35 mm, 525 g) on ​​top of the filter paper and leave it to stand.

[0125] (10) One minute after placing the filter paper and weight, remove the filter paper and weight and measure the mass B (g) of the filter paper after absorbing the liquid. (11) Calculate the amount (g) of liquid (defibered horse blood) absorbed by the filter paper by subtracting the initial mass A (g) from the mass B (g) of the filter paper after liquid absorption, and use this amount as the rewet amount (g). (12) When the rewet amount of a simple sanitary napkin that does not contain a blood slipping agent and an osmotic pressure adjuster is m (g) and the rewet amount of a simple sanitary napkin that contains a blood slipping agent and / or an osmotic pressure adjuster is n (g), the rewet reduction rate (mass%) is calculated using the following formula: Rewet reduction rate (mass%) = 100 × (mn) / m It is calculated as follows.

[0126] [Table 1]

[0127] Table 1 shows that when the SAP ratio is 10% by mass, the rewet rate reduction rate of 71.2% for simple sanitary napkin No. 5, which contains both a blood slipping agent and an osmotic pressure adjuster, is higher than the combined rewet rate reduction rate of 24.8% for simple sanitary napkin No. 6, which contains only a blood slipping agent, and simple sanitary napkin No. 7, which contains only an osmotic pressure adjuster, indicating that the combined effect of a blood slipping agent and an osmotic pressure adjuster is high. Furthermore, it can be seen from Table 1 that when the SAP ratio was 15% by mass and 20% by mass, the same results as when the SAP ratio was 10% by mass were obtained.

[0128] [Manufacturing Example 25] Simple sanitary napkin No. 25 was produced in the same manner as in Production Example 1, except that the absorbent core was changed as follows. The bulky part is made of softwood pulp fiber (basis weight: 67 g / m 2 ) and sodium polyacrylate-based superabsorbent polymer (basis weight: 10 g / m 2 ), and the SAP ratio was 15 mass %. The non-bulky part is made of pulp fiber (basis weight: 33 g / m 2 ) and sodium polyacrylate-based superabsorbent polymer (basis weight: 5g / m 2), and the SAP ratio was 15 mass %.

[0129] [Manufacturing Examples 26-32] Sanitary napkins Nos. 26 to 32 were produced in the same manner as in Production Example 25, except that the absorbent core, blood slipping agent, and osmotic pressure adjusting agent were changed as shown in Table 2. In simple sanitary napkins No. 25 to No. 32, the SAP ratio in the bulky and non-bulky portions of the absorbent core was 15% by mass.

[0130] [Example 2] For simple sanitary napkins Nos. 25 to 32, the rewet amount and rewet amount reduction rate were measured while changing the amount of defibered horse blood, the number of injections, and the standing time according to the amount of pulp fiber in the absorbent core, as shown in Table 2. The results are shown in Table 2. For reference, Table 2 also shows the results for simple sanitary napkins Nos. 9 to 12.

[0131] [Table 2]

[0132] Table 2 shows that sanitary napkins No. 25, No. 9 and No. 29, which have different basis weights of softwood pulp fiber in the absorbent core, all have a high effect when used in combination with a blood slipping agent and an osmotic pressure adjusting agent.

[0133] [Manufacturing Examples 33-44] Sanitary napkins Nos. 33 to 44 were produced in the same manner as in Production Example 1, except that the type and amount of the osmotic pressure adjusting agent and the amount of the blood slipping agent were changed as shown in Table 3.

[0134] [Example 3] For simple sanitary napkins Nos. 33 to 44, the rewet amount and the rewet amount reduction rate were measured according to the conditions shown in Table 3. The results are shown in Table 3.

[0135] [Table 3]

[0136] Table 3 shows that the combined effect of the blood slipping agent and the osmotic pressure adjuster is high even when the osmotic pressure adjuster is alanine (simple sanitary napkin No. 33), erythritol (simple sanitary napkin No. 37), or xylitol (simple sanitary napkin No. 41).

[0137] [Manufacturing Examples 45-48] Sanitary napkins Nos. 45 to 48 were produced in the same manner as in Production Example 1, except that the type and amount of the blood slipping agent and the amount of the osmotic pressure adjusting agent were changed as shown in Table 4. Panasate 810S contains C8 fatty acids: 10 It is a triester (triglyceride) of glycerin and fatty acids, containing the above fatty acids in a weight ratio of approximately 85:15.

[0138] [Example 3] For simple sanitary napkins Nos. 45 to 48, the rewet amount and the rewet amount reduction rate were measured under the conditions shown in Table 4. The results are shown in Table 4.

[0139] [Table 4]

[0140] Table 4 shows that even when the blood slipping agent is Panasate 810S (simple sanitary napkin No. 45), the combined effect of the blood slipping agent and the osmotic pressure adjuster is high.

[0141] [Manufacturing Examples 49-52] Sanitary napkins Nos. 49 to 52 were produced in the same manner as in Production Example 1, except that the amounts of the blood slipping agent and the osmotic pressure adjusting agent were changed as shown in Table 5.

[0142] [Example 4] The rewet amount and rewet amount reduction rate were measured for simple sanitary napkins Nos. 49 to 52 under the conditions shown in Table 5. The results are shown in Table 5. For reference, Table 5 also shows the results for simple sanitary napkins Nos. 9 to 12.

[0143] [Table 5]

[0144] Table 5 shows that even in simple sanitary napkin No. 53, in which the amount of osmotic pressure adjuster was reduced to 0.12 g per product, the combined effect of the blood slipping agent and osmotic pressure adjuster was high. [Explanation of symbols]

[0145] 1 sanitary napkin 3 Skin contact sheet 5a Skin contact surface 5b Non-skin contact surface 7 Liquid-impermeable sheet 9 Absorbent 11 Absorption Core 13 Core Wrap 13a Skin-side Core Wrap 13b Non-skin side core wrap 15a Skin side 15b Non-skin side 21 Side seat 23 Adhesive part 31 Blood slipping agents 33 Osmolality adjusters L Longitudinal direction W width direction T thickness direction

Claims

1. An absorbent article for absorbing blood, comprising an absorbent body having an absorbent core and a liquid-permeable sheet disposed closer to the skin than the absorbent body, the liquid-permeable sheet contains a blood slipping agent for transferring the blood to the absorbent body, the absorbent article includes an osmotic pressure adjusting agent for adjusting the osmotic pressure of blood cell components in the blood, The absorbent core contains a superabsorbent polymer and hydrophilic fibers such that the ratio of the superabsorbent polymer to the hydrophilic fibers is 5% by mass or more. An absorbent article characterized by:

2. 2. The absorbent article according to claim 1, wherein the absorbent core contains the superabsorbent polymer and the hydrophilic fibers such that the ratio of the superabsorbent polymer to the hydrophilic fibers is 10 to 20% by mass.

3. The absorbent article according to claim 1 , wherein the blood slipping agent and the osmotic pressure adjusting agent are arranged so as to overlap each other in the thickness direction of the absorbent article.

4. The absorbent article according to claim 1 , wherein the blood slipping agent is disposed closer to the skin than the osmotic pressure adjusting agent in the thickness direction of the absorbent article.

5. The absorbent article according to claim 1, wherein the amount of the osmotic pressure adjusting agent per absorbent article is greater than the amount of the blood slipping agent.

6. The absorbent article according to claim 1, wherein the absorbent body contains 0.08 to 1.00 g of the osmotic pressure adjusting agent per absorbent article.

7. The absorbent article according to claim 1 , wherein the absorbent body comprises the osmotic pressure adjusting agent.

8. The absorbent article of claim 1, wherein the absorbent body further comprises a skin-side core wrap sheet arranged on the skin side of the absorbent core, and the absorbent body comprises the osmotic pressure adjusting agent in the skin-side core wrap sheet.

9. 2. The absorbent article according to claim 1, wherein the liquid-permeable sheet comprises a skin-contact sheet having a skin-contact surface that contacts the skin of a user, and the skin-contact sheet contains the blood slipping agent.

10. The absorbent article according to claim 9 , wherein the skin contact sheet has the blood slipping agent on the skin contact surface.

11. The absorbent article of claim 1 , wherein the osmotic pressure adjusting agent comprises at least one component selected from the group consisting of neutral zwitterions, sugars, and polyhydric alcohols.

12. The absorbent article of claim 1 , wherein the osmotic pressure adjusting agent comprises at least one selected from the group consisting of glycine, alanine, erythritol, and xylitol.

13. The liquid-permeable sheet contains the blood slipping agent in an amount of 1.0 to 10.0 g / m 2 10. The absorbent article of claim 1, comprising:

14. The blood slipping agent has a viscosity of 0.01 to 80 mm at 40°C. 2 2. The absorbent article according to claim 1, having a kinematic viscosity of 0.01 to 4.0% by mass, a water holding percentage of 0.01 to 4.0% by mass, and a weight average molecular weight of less than 1,000.

15. The absorbent core contains the superabsorbent polymer in an amount of 10 to 100 g / m 2 10. The absorbent article of claim 1, comprising:

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