Absorbent article

Abstract

The purpose of the present disclosure is to provide an absorbent article having excellent rewetting resistance.　Provided is an absorbent article (1) for absorbing blood, the absorbent article (1) comprising: an absorbent body (9) having an absorbent core (11); and a liquid-permeable sheet (3) disposed closer to the skin side than the absorbent body (9). The absorbent article (1) is characterized in that: the liquid-permeable sheet (3) includes 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 blood cell components in the blood; and the absorbent core (11) includes a superabsorbent polymer and hydrophilic fibers such that the ratio of the superabsorbent polymer to the hydrophilic fibers is 5 mass % or more.

Description

absorbent articles

[0001] The present disclosure relates to absorbent articles.

[0002] Studies have been conducted to improve the absorbency of absorbent articles. For example, Patent Literature 1 discloses an absorbent article having an absorbent body for absorbing blood, which contains a superabsorbent 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, wherein 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.

[0004] JP 2022-013798 A International Publication No. 2013 / 129236

[0005] The absorbent article according to the present disclosure is not disclosed in Patent Document 1 or Patent Document 2. Therefore, an object of the present disclosure is to provide an absorbent article that has excellent rewet resistance.

[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.

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

[0008] Fig. 1 is a diagram illustrating a sanitary napkin 1 according to a first embodiment. Fig. 2 is a diagram illustrating a sanitary napkin 1 according to the first embodiment.

[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, 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.

[0010] In the absorbent article, the liquid-permeable sheet disposed closer to the skin than the absorbent body contains a predetermined blood slipping agent, the absorbent article contains a predetermined osmotic pressure adjuster, and the absorbent core contains a predetermined ratio of superabsorbent polymer. The blood slipping agent, together with the blood slipping agent, has a blood sliding effect, which allows blood that reaches the liquid-permeable sheet of the absorbent article to quickly slide down to the absorbent body, particularly the absorbent core. The osmotic pressure adjuster also adjusts the osmotic pressure of blood cell components (e.g., red blood cells, white blood cells, and platelets) in the blood, dehydrating and shrinking the blood cell components to deform them, and has an adhesion-inhibiting effect, which makes it difficult for blood cell components attached to the surface of the superabsorbent polymer to adhere to each other. This adhesion-inhibiting effect ensures a passage for blood 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-inhibiting effect of the osmotic pressure adjuster results in the absorbent article having excellent rewet resistance against blood.

[0011] [Aspect 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 adjuster are arranged so as to overlap 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 quickly exert its blood sliding effect and the osmotic pressure adjuster can quickly exert its adhesion inhibitory effect. As a result, the absorbent article has excellent rewetting 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 adjuster 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 adjuster per absorbent article is greater than the amount of the blood slipping agent. The absorbent article allows the blood slipping agent to exhibit a blood sliding effect while allowing the osmotic pressure adjuster to exhibit an adhesion inhibitory effect.

[0016] [Aspect 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] The absorbent article according to any one of Aspects 1 to 6, wherein the absorbent body comprises the osmotic pressure adjuster. In the absorbent article, the absorbent body (e.g., the entire absorbent body, the absorbent core, materials constituting the absorbent body other than the absorbent core, etc.) comprises the osmotic pressure adjuster, so that the osmotic pressure adjuster can adequately exert its adhesion suppression effect. Therefore, the absorbent article has excellent rewet resistance against blood.

[0019] [Aspect 8] The absorbent article according to any one of Aspects 1 to 7, wherein the absorbent further comprises a skin-side core wrap sheet disposed on the skin side of the absorbent core, and the skin-side core wrap sheet of the absorbent comprises the osmotic pressure adjuster. In the absorbent article, since the absorbent comprises the skin-side core wrap sheet of the absorbent, the osmotic pressure adjuster can accurately exert its adhesion-inhibiting effect before blood reaches the absorbent core. Therefore, the absorbent article has 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 absorbent article, the skin-contacting sheet contains a blood slipping agent, which can accurately exert a blood sliding effect on blood that reaches the skin-contacting sheet, so the absorbent article has excellent rewetting resistance against blood.

[0022] [Aspect 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 absorbent article, since the skin-contacting sheet comprises the blood slipping agent on the skin-contacting surface, the blood slipping agent can accurately exhibit a blood-slipping effect on blood that has reached the skin-contacting surface of the skin-contacting sheet, and therefore the absorbent article has excellent rewet resistance against blood.

[0023] [Aspect 11] The absorbent article according to any one of Aspects 1 to 10, wherein the osmotic pressure adjuster comprises at least one component selected from the group consisting of neutral zwitterions, sugars, and polyhydric alcohols. In the absorbent article, the osmotic pressure adjuster contains a predetermined component, allowing the osmotic pressure adjuster to more effectively exert the adhesion-inhibiting effect. Therefore, the absorbent article has excellent rewetting resistance against blood.

[0024] [Aspect 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, the osmotic pressure adjuster contains a predetermined substance, which allows the osmotic pressure adjuster to more effectively exert the adhesion-inhibiting effect. Therefore, the absorbent article has excellent rewetting 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 The absorbent article according to any one of Aspects 1 to 12, wherein the liquid-permeable sheet contains the blood slipping agent at a predetermined basis weight. In the absorbent article, the blood slipping agent can adequately exhibit its blood sliding effect, and the absorbent article has excellent rewetting resistance against blood.

[0026] [Embodiment 14] The blood slipping agent has a viscosity of 0.01 to 80 mm at 40°C. 2The absorbent article according to 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 configuration, the blood slipping agent can adequately exhibit its 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 The absorbent article according to any one of Aspects 1 to 14, wherein the absorbent core contains the superabsorbent polymer at a predetermined basis weight. In the absorbent article, the blood slipping agent is more likely to properly exhibit its blood sliding effect, and the osmotic pressure adjuster is more likely to properly exhibit its adhesion inhibitory effect, resulting in excellent rewetting resistance against blood.

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

[0029] The sanitary napkin 1 has a longitudinal direction L, a width direction W, and a thickness direction T that are perpendicular to one another, and has a vertically 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-contacting 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 from 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 from the skin side, and a non-skin-side core wrap 13b covering the absorbent core 11 from 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 accurately exhibit its blood sliding effect, and the osmotic pressure adjuster 33 to more accurately exhibit its adhesion-inhibiting effect, resulting in the sanitary napkin 1 having excellent rewetting resistance to 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 disposed closer to the skin than the absorbent body and is used to absorb 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 one another. The direction including the longitudinal direction and the width direction may also be referred to as the planar direction.

[0034] The liquid-permeable sheet is not particularly limited as long as it is used as a liquid-permeable sheet in the technical field, and examples thereof include nonwoven fabrics, woven fabrics, etc. 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, 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] In this specification, 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 obtained 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 fiber to pass through) with a mass of m1 (g), and the sample, together 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 together with the mesh bag is removed from the aqueous solution, and the sample together with the mesh bag is exposed to sunlight for 3 days to reduce the molecular weight of the superabsorbent polymer. The sample together with the mesh bag is then washed 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 has not disappeared in the sample or if the slimy feeling after washing has not disappeared, the mesh bag is immersed again in the aqueous solution to repeat the reduction in molecular weight of the superabsorbent polymer by sunlight.

[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), and the mass of the mesh bag containing the sample: m2 (g) is measured. (5) The ratio of superabsorbent polymer to hydrophilic fiber: R (mass%) is calculated using the following formula: R (mass%) = 100 x [m0 - (m2 - m1)] / (m2 - m1). (6) R (mass%) is measured five times for different samples, and the average is used 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 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 known in the art as hydrophilic, including absorbent fibers such as cellulosic fibers and non-absorbent fibers such as synthetic fibers that have been hydrophilized. 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 (e.g., cotton fibers), bast fibers (e.g., hemp), vein fibers (e.g., Manila hemp), and fruit fibers (e.g., 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, etc.

[0044] The cotton fiber includes Hirsutum cotton fiber (e.g., upland cotton), Barbadense cotton fiber, Arboreum cotton fiber, and Helbaceum cotton fiber. The cotton fiber may also be organic cotton fiber or Pre-Organic Cotton (trademark) fiber. Organic cotton fiber refers to cotton certified by GOTS (Global Organic Textile Standard).

[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 includes lyocell, specifically, a fiber obtained by dissolving pulp in an aqueous solution of N-methylmorpholine N-oxide to form a spinning dope (dope) and extruding the dope into a dilute solution of N-methylmorpholine N-oxide. The purified cellulose is commercially available, for example, under the trade name Tencel (trademark). The semi-synthetic fiber includes semi-synthetic cellulose, such as acetate fibers, e.g., 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, 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, more 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. 2 In order to have a kinematic viscosity of 80 mm / s, it is preferable that the melting point of the blood slipping agent is 45°C or lower. This is because if the blood slipping agent contains crystals at 40°C, its kinematic viscosity tends to increase. In this specification, the kinematic viscosity at 40°C may be simply referred to as "kinematic viscosity". 2 If the viscosity exceeds 1 / s, the blood slipping agent will have high viscosity, and it will tend to be difficult for the agent to slide down from the liquid-permeable sheet to the absorbent body together with 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 preferably has a water holding percentage of 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 preferably has a water holding percentage of 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 rate" refers to the proportion of water that a substance can hold, and can be measured as follows: (1) A test tube, rubber stopper, substance to be measured, and deionized water are left standing overnight in a thermostatic chamber at 40°C. (2) In the thermostatic chamber, 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 thermostatic chamber, the mouth of the test tube is sealed with a rubber stopper, rotated once, and left standing 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 placed in a 90 mm diameter glass petri dish (mass: W0). (5) The petri dish is heated in an oven at 105°C for 3 hours to evaporate the water, and the mass of the entire dish is measured (mass: W1). (6) The water holding percentage is calculated according to the following formula: Water holding percentage (mass%) = 100 x (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 too small, the vapor pressure of the blood slipping agent increases, which can lead to evaporation during storage, loss of volume, odor when worn, and other problems.

[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, ...) of 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 refers to a polystyrene-equivalent value determined by gel permeation chromatography (GPC). Measurement conditions for GPC include, for example, the following: Model: High-performance liquid chromatogram Lachrom Elite manufactured by Hitachi High-Technologies Corporation Column: SHODEX KF-801, KF-803, and KF-804 manufactured by Showa Denko K.K. Eluent: THF Flow rate: 1.0 mL / min Injection volume: 100 μL Detection: RI (differential refractometer)

[0058] Examples of the blood slipping agent include (a1) an ester of a chain hydrocarbon tetraol and at least one fatty acid, (a2) an ester of a chain hydrocarbon triol and at least one fatty acid, (a3) ​​an ester of a chain hydrocarbon diol and at least one fatty acid, (b1) an ether of a chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol, (b2) an ether of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol, (b3) an ether of a chain hydrocarbon diol and at least one aliphatic monohydric alcohol, (c1) an ester of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol, (c2) a chain hydrocarbon tricarboxylic acid having three carboxyl groups and at least one aliphatic monohydric alcohol, (c3) an ester of a chain hydrocarbon tricarboxylic acid having three carboxyl groups and at least one aliphatic monohydric alcohol, (c4) an ester of a chain hydrocarbon tricarboxylic acid having three carboxyl groups and at least one aliphatic monohydric alcohol, (c5) an ester of a chain hydrocarbon tricarboxylic acid having four carboxyl groups and at least one aliphatic monohydric alcohol, (c6) an ester of a chain hydrocarbon tricarboxylic acid having three carboxyl groups and at least one aliphatic monohydric alcohol, (c7) an ester of a chain hydrocarbon tricarboxylic acid having three carboxyl groups and at least one aliphatic monohydric alcohol, (c8) an ester of a chain hydrocarbon tricarboxylic acid having three carboxyl groups and at least one aliphatic monohydric alcohol, (c9) an ester of a chain hydrocarbon tricarboxylic acid having three carboxyl groups and at least one aliphatic monohydric alcohol, (c10) an ester of a chain hydrocarbon tricarboxylic acid having four carboxyl groups and at least one aliphatic monohydric alcohol, (c11) an ester of a chain hydrocarbon tricarboxylic acid having four carboxyl groups (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] Examples of (a1) 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 C6 30saturated 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 ) and the like, as well as unlisted isomers thereof.

[0061] The fatty acid may also be an unsaturated fatty acid, such as a C3 to C6 fatty acid. 20 unsaturated fatty acids, such as monounsaturated fatty acids, for example, crotonic acid (C), myristoleic acid (C 14 ), palmitoleic acid (C 16 ), oleic acid (C 18 ), elaidic acid (C 18 ), 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, for example, 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 ), tetraunsaturated fatty acids, for example, stearidonic acid (C 20 ), arachidonic acid (C 20 ), eicosatetraenoic acid (C 20 ), etc., pentaunsaturated fatty acids, for example, boseopentaenoic acid (C 18 ), eicosapentaenoic acid (C 20 ) and the like, as well as partial hydrogen adducts thereof.

[0062] The ester of pentaerythritol and a fatty acid is preferably an ester of pentaerythritol and a fatty acid derived from a saturated fatty acid, i.e., an ester of pentaerythritol and a saturated fatty acid, in consideration of the possibility of denaturation due to oxidation, etc. Furthermore, 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, in terms of reducing the water holding percentage.

[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] Examples of (a2) 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 acid is as described above. From the viewpoint of reducing the water holding percentage, the ester of glycerin and fatty acid is preferably a diester or triester, and more preferably a triester.

[0066] Examples of the triesters of glycerin and two or more fatty acids include triesters of glycerin and octanoic acid (C8) and decanoic acid (C9). 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 the fatty acids constituting the triester of glycerin and a fatty acid of about 40 or less.

[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, and the like.

[0069] [(a3) Ester of a Chain Hydrocarbon Diol and at Least One Fatty Acid] Examples of (a3) ​​ester of a chain hydrocarbon diol and at least one fatty acid include monoesters or diesters of 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, with a fatty acid.

[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, etc., the ester of a C2-C6 glycol and a fatty acid is preferably an ester of a C2-C6 glycol and a fatty acid derived from a saturated fatty acid, i.e., an ester of a C2-C6 glycol and a saturated fatty acid.

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

[0072] [(b1) Ethers of Chain Hydrocarbon Tetraols and At Least One Aliphatic Monohydric Alcohol] Examples of (b1) 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 C6 20saturated 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) Ethers of Linear Hydrocarbon Triols and At Least One Aliphatic Monohydric Alcohol] (b2) Ethers of Linear Hydrocarbon Triols and At Least One Aliphatic Monohydric Alcohols include, for example, triethers, diethers, and monoethers of glycerin and aliphatic monohydric alcohols. The aliphatic monohydric alcohols are as described above.

[0076] [(b3) Ethers of Linear Hydrocarbon Diols and At Least One Aliphatic Monohydric Alcohol] (b3) Ethers of linear hydrocarbon diols and at least one aliphatic monohydric alcohol include diethers of C2-C6 glycols and aliphatic monohydric alcohols, and monoethers of C2-C6 glycols and aliphatic monohydric alcohols. The aliphatic monohydric alcohols are as described above.

[0077] [(c1) Esters of a Chain Hydrocarbon Tetracarboxylic Acid, Hydroxy Acid, Alkoxy Acid, or Oxoacid Having Four Carboxyl Groups and At Least One Aliphatic Monohydric Alcohol] Examples of (c1) esters of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid, or oxoacid having four carboxyl groups and at least one aliphatic monohydric alcohol include monoesters, diesters, triesters, and tetraesters, preferably diesters, triesters, and tetraesters, more preferably triesters and tetraesters, and even more preferably tetraesters, of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid, or oxoacid having four carboxyl groups and at least one aliphatic monohydric alcohol.

[0078] Examples of the chain hydrocarbon tetracarboxylic acid include alkanetetracarboxylic acids such as butanetetraacid, pentanetetraacid, hexanetetraacid, heptanetetraacid, octanetetraacid, nonanetetraacid, and decanetetraacid. The aliphatic monohydric alcohol is as described above.

[0079] [(c2) Esters of a Linear Hydrocarbon Tricarboxylic Acid, Hydroxy Acid, Alkoxy Acid, or Oxoacid Having Three Carboxyl Groups and At Least One Aliphatic Monohydric Alcohol] Examples of (c2) esters of a linear hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid, or oxoacid 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 linear hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid, or oxoacid having three carboxyl groups and at least one aliphatic monohydric alcohol.

[0080] Examples of the linear 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 alcohols are as described above. An example is O-acetyl tributyl citrate, 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] Examples of (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 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 linear 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 alcohols are 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 an aliphatic monohydric alcohol and an aliphatic monohydric alcohol is represented by the following formula (1): 1 OR 2 (1) (wherein, R 1 and R 2 and each of R is a chain hydrocarbon. 1 OH and R 2 The groups corresponding to OH are as described above.

[0084] [(d2) Dialkyl ketone] The dialkyl ketone is a ketone represented by the following formula (2): 3 COR 4 (2) (wherein, R 3 and R 4 wherein each of the is an alkyl group. 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 fatty acid and aliphatic monohydric alcohol include those represented by the following formula (3): 5 COOR 6 (3) (wherein, R 5 and R 6 are each a chain hydrocarbon).

[0086] The fatty acid constituting the ester (in formula (3), R 5 Examples of the aliphatic monohydric alcohol (corresponding to R COOH) that constitutes the ester include the above-mentioned fatty acids, and saturated fatty acids are preferred in view of the possibility of denaturation due to oxidation, etc. 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 ), esters with tetradecanoic acid (C 14 ) and dodecyl alcohol (C 12 Examples of commercially available esters of the above fatty acids and aliphatic monohydric alcohols include Electol WE 20 and Electol WE 40 (both manufactured by NOF Corporation).

[0088] [(d4) Dialkyl Carbonate] The dialkyl carbonate may be a dialkyl carbonate represented by the following formula (4): 7 OC(=O)OR 8 (4) (wherein, R 7 and R 8 wherein each of is an alkyl group. The 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 refers to i) a homopolymer having an oxy C3-C6 alkylene skeleton, i.e., 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 poly C3-C6 alkylene glycols include 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 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 acid is as described above.

[0091] [(e3) Ethers 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 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] Examples of (f1) chain alkanes include linear alkanes and branched alkanes. Commercially available examples of the hydrocarbons include 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 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 2The liquid-permeable sheet is preferably a skin-contacting sheet or a second sheet having a skin-contacting surface that contacts the skin of the user, and more preferably a skin-contacting sheet.

[0094] The absorbent article according to the present disclosure contains 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 article according to the present disclosure also contains 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 article has 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, the skin-contacting surface), inside the liquid-permeable sheet, and / or on the non-skin-side surface (in the case of a skin-contacting sheet, the non-skin-contacting surface), 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]

[0010] In addition, the absorbent article preferably includes the blood slipping agent so as to overlap the osmotic pressure adjuster in the thickness direction. This allows the blood slipping agent to rapidly exhibit its blood sliding effect, and the osmotic pressure adjuster to rapidly exhibit its adhesion-inhibiting effect, resulting in the absorbent article having excellent rewetting resistance against blood. 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 include 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 known as osmolytes, and more specific examples thereof include 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. As a result, blood cell components in blood shrink and deform unevenly, making it difficult for blood cell components attached to the surface of the superabsorbent polymer to bond with each other. 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 difficult to bond with each other 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, but examples include amino acids such as taurine, betaine, serine, glycine, glycylglycine, tricine, L-phenylalanine, creatine, and arginine, and sulfobetaine. These zwitterions may be used alone or in combination of two or more. Among the zwitterions, amino acids with relatively small molecular weights, such as glycine (molecular weight 75), serine (molecular weight 105), and betaine (molecular weight 117), are preferred because they can increase osmotic pressure even with a small amount of addition.

[0103] Furthermore, 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, and erythrose, and disaccharides such as sucrose. These sugars may be used alone or in combination of two or more. Among the above sugars, sugars having four or more carbon atoms, such as glucose, fructose, galactose, mannose, xylose, erythrose, and sucrose, are preferred in terms of the ease with which the above-mentioned osmotic pressure adjusting effect can be obtained.

[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, and erythritol, cyclitols such as inositol, and lower alcohols such as propylene glycol. These polyhydric alcohols may be used alone or in combination of two or more. Among the above polyhydric alcohols, polyhydric alcohols having 4 or more carbon atoms, such as sorbitol, mannitol, xylitol, erythritol, and inositol, are preferred in terms of the ease with which the above-mentioned osmotic pressure adjusting effect can be obtained.

[0105] In addition, 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 effect of inhibiting 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. The solubility of the osmotic pressure adjuster in 100 g of ion-exchanged water at 25° C. is 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 having 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 time onwards. Therefore, absorbent articles containing osmotic pressure adjusters having 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.

[0118] [Production Example 1] Skin contact sheet (air-through nonwoven fabric, basis weight: 22 g / m 2 ), second sheet (air-through nonwoven fabric, basis weight: 25 g / m 2 ), skin side core wrap sheet (tissue, basis weight: 14 g / m 2 ), absorbent core, non-skin side core wrap sheet (tissue, basis weight: 14 g / m 2 ), and a 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 each had a size of 100 mm x 50 mm (longitudinal x transverse). The absorbent core had a size 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 / m). 2 ) and a sodium polyacrylate-based superabsorbent polymer (basis weight: 20 g / m 2 The non-bulky portion contained pulp fibers (basis weight: 200 g / m2), and the ratio of superabsorbent polymer to softwood pulp fibers (hereinafter referred to as "SAP ratio") was 5% by mass. 2 ) and a sodium polyacrylate-based superabsorbent polymer (basis weight: 10 g / m 2 ) and the SAP ratio was 5% by 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 on a 100 mm x 50 mm (longitudinal x transverse) sheet. 2 The sanitary napkin No. 1 had a basis weight of 1000 g and was coated in an amount of 0.015 g per simple sanitary napkin No. 1. Glycine was also coated as an osmotic pressure adjusting agent in the center of the non-skin side of the skin side core wrap sheet in an amount of 0.36 g per product (0.36 g / p) in a size of 70 x 20 mm (longitudinal x transverse).

[0121] [Production Examples 2 to 24] Simple sanitary napkins No. 2 to No. 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 simple sanitary napkins No. 1 to No. 24, the SAP ratio in the bulky and non-bulky portions of the absorbent core was the same.

[0122] [Example 1] For simple sanitary napkins No. 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) A bottle containing de-fibered horse blood (Japan Bioserum) was maintained at 37°C using a water bath. (2) An acrylic jig with an opening was placed on top of a simple sanitary napkin. The acrylic jig measured 100 mm x 50 mm (length x width) and had a 40 mm x 10 mm (length x width) opening in the center. (3) The initial mass A (g) (approximately 2 g) of the filter paper (50 mm x 35 mm) was measured. (4) After slowly shaking the bottle containing the de-fibered horse blood up and down to agitate it, x mL (mL, first time) of de-fibered horse blood was measured with a micropipette and injected into the acrylic jig from a position 5 mm above the center of the opening over approximately 2 seconds.

[0124] (5) After injecting the defibered horse blood, allow it to stand for 30 seconds. (6) If desired, inject x (mL, second time) of defibered horse blood into the simple sanitary napkin in the same manner as in (4) and allow it to stand for 30 seconds. (7) If desired, inject x (mL, third time) of defibered horse blood into the simple sanitary napkin in the same manner as in (4) and allow it to stand for 30 seconds. (8) After the simple sanitary napkin has absorbed the defibered horse blood for the first to third times, remove the acrylic jig. (9) After allowing it to stand for y minutes after the first to third injections of defibered horse blood have been completed, place filter paper centered on the drip site, and then place a weight (50 mm x 35 mm, 525 g) on ​​top of that and allow 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) The amount (g) of liquid (defibered horse blood) absorbed by the filter paper is calculated by subtracting the initial mass A (g) from the mass B (g) of the filter paper after absorbing the liquid, and this amount is 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 × (m - n) / m

[0126]

[0127] Table 1 shows that when the SAP ratio was 10% by mass, the rewet rate reduction rate of 71.2% for simple sanitary napkin No. 5, which contained both a blood slipping agent and an osmotic pressure adjuster, was higher than the combined rewet rate reduction rate of 24.8% for simple sanitary napkin No. 6, which contained only a blood slipping agent, and simple sanitary napkin No. 7, which contained only an osmotic pressure adjuster, demonstrating the high effect of using a blood slipping agent and an osmotic pressure adjuster in combination. Table 1 also shows that when the SAP ratio was 15% by mass and 20% by mass, similar results to those obtained when the SAP ratio was 10% by mass were obtained.

[0128] [Production 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 portion was made of softwood pulp fiber (basis weight: 67 g / m 2 ) and a sodium polyacrylate-based superabsorbent polymer (basis weight: 10 g / m 2 The non-bulky portion contained pulp fiber (basis weight: 33 g / m 2 ) and a sodium polyacrylate-based superabsorbent polymer (basis weight: 5 g / m 2 ) and the SAP ratio was 15% by mass.

[0129] [Production Examples 26 to 32] Simple sanitary napkins No. 26 to No. 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]

[0132] From Table 2, it can be seen 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 of using the blood slipping agent and the osmotic pressure adjusting agent in combination.

[0133] [Production Examples 33 to 44] Simple sanitary napkins No. 33 to No. 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]

[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] [Production Examples 45 to 48] Simple sanitary napkins No. 45 to No. 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 a C8 fatty acid: 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] The rewet amount and the rewet amount reduction rate were measured for simple sanitary napkins Nos. 45 to 48 under the conditions shown in Table 4. The results are shown in Table 4.

[0139]

[0140] From Table 4, it can be seen 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] [Production Examples 49 to 52] Simple sanitary napkins No. 49 to No. 52 were produced in the same manner as in Production Example 1, except that the amount of the blood slipping agent and the amount of 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]

[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 the osmotic pressure adjuster was high.

[0145] REFERENCE SIGNS LIST 1 sanitary napkin 3 skin-contacting sheet 5a skin-contacting surface 5b non-skin-contacting surface 7 liquid-impermeable sheet 9 absorbent body 11 absorbent core 13 core wrap 13a skin-side core wrap 13b non-skin-side core wrap 15a skin-side surface 15b non-skin-side surface 21 side sheet 23 adhesive portion 31 blood slipping agent 33 osmotic pressure adjusting agent 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 positioned 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.

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. An absorbent article according to claim 1 or 2, wherein the blood slipping agent and the osmotic pressure adjusting agent are arranged so as to overlap in the thickness direction of the absorbent article.

4. An absorbent article as described in any one of claims 1 to 3, wherein the blood slipping agent is positioned closer to the skin than the osmotic pressure adjusting agent in the thickness direction of the absorbent article.

5. An absorbent article according to any one of claims 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.

6. The absorbent article according to any one of claims 1 to 5, 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 any one of claims 1 to 6, wherein the absorbent body comprises the osmotic pressure adjusting agent.

8. An absorbent article described in any one of claims 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.

9. An absorbent article according to any one of claims 1 to 8, wherein the liquid-permeable sheet comprises a skin-contacting sheet having a skin-contacting surface that contacts the user's skin, and the skin-contacting 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 according to any one of claims 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.

12. The absorbent article according to any one of claims 1 to 11, 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 The absorbent article according to any one of claims 1 to 12, comprising a basis weight of 14. The blood slipping agent has a viscosity of 0.01 to 80 mm at 40°C. 2 The absorbent article according to any one of claims 1 to 13, having a kinematic viscosity 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 The absorbent article according to any one of claims 1 to 14, comprising a basis weight of

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