JP5988811B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article.

  In absorbent articles such as sanitary napkins and panty liners, liquid excreta such as menstrual blood permeates the liquid permeable layer such as the top sheet and is absorbed and retained by the absorbent body. Therefore, it tends to remain in the liquid permeable layer. When menstrual blood remains in the liquid-permeable layer of the absorbent article, it gives the wearer a feeling of stickiness, visual discomfort, etc .. It is required to reduce menstrual blood remaining in the sex layer.

  In particular, menstrual menstrual blood may contain components such as endometrium, and the viscosity thereof is high. However, even after absorption of menstrual blood having a high viscosity, the top sheet has a sticky feeling. It is preferable that the material is smooth. In addition, highly viscous menstrual blood often remains in a lump state on the top sheet, and the user often feels visually uncomfortable. It is preferable not to leave it on the top sheet.

  Absorbent articles coated with a lotion composition are known in the art. For example, Patent Document 1 discloses a lotion composition containing a polypropylene glycol material, an inner surface of a top sheet (clothing side surface), an inner surface of a back sheet (body side surface), an inner surface of the top sheet, and a back sheet. An absorbent article disposed on a base material or the like between the inner surfaces is disclosed. Patent Document 2 discloses an absorbent article in which a lotion composition containing a polypropylene glycol material is applied to the outer surface (surface on the body side) of a top sheet.

  Moreover, in the said technical field, it is known that the nonwoven fabric used for the top sheet of an absorbent article uses a heat | fever extensible fiber and a heat-fusible composite fiber as a raw material. For example, Patent Document 3 includes a heat-fusible conjugate fiber composed of two components having different melting points and a non-heat-fusible fiber, and the intersection of the heat-fusible conjugate fibers is heat-sealed. The heat-fusible conjugate fiber and the non-heat-fusible fiber are non-heat-bonded nonwoven fabrics, and the heat-fusible conjugate fiber has a first resin component having an orientation index of 40% or more, and The second resin component has a melting point or softening point lower than the melting point of the first resin component and an orientation index of 25% or less, and the second resin component continuously extends at least part of the fiber surface in the length direction. Existing nonwovens have been proposed. In addition, Patent Document 4 has a large number of pressure bonding portions to which the constituent fibers are pressure-bonded or bonded, and the intersections of the constituent fibers are joined by means other than pressure bonding in a portion other than the pressure bonding portions, The pressure-bonding part is a three-dimensional shaped non-woven fabric having a concave-convex shape in which at least one surface is a concave part and a convex part between the concave parts, and the length of the constituent fiber is increased by heating. A three-dimensionally shaped nonwoven fabric using heat-extensible fibers has been proposed.

Special table 2010-518918 Special table 2011-510801 gazette JP-A-2005-350835 JP 2005-350836 A

  However, Patent Documents 1 to 4 have not been designed to improve menstrual blood transfer from the top sheet to the absorber and reduce menstrual blood remaining on the top sheet. Then, an object of this invention is to provide the absorbent article which has the improved menstrual blood transfer property from a top sheet to an absorber, and can reduce the menstrual blood remaining on a top sheet.

In order to solve the above problems, the present invention includes a nonwoven fabric topsheet containing at least a heat-fusible conjugate fiber, and the degree of fiber orientation along the machine direction of the nonwoven fabric topsheet and the fiber along the width direction. The ratio of the degree of orientation (machine direction / width direction) is 1.0 to 7.0, which is an absorbent article, and the non-woven top sheet is 0.01 at 40 ° C. in the excretory opening contact area. Blood slipping agent-containing region comprising a blood slipping agent having a kinematic viscosity of ˜80 mm ² / s, a water retention of 0.01 to 4.0% by mass, and a weight average molecular weight of less than 1,000 An absorbent article is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which has the improved menstrual blood transfer property from a top sheet to an absorber, and can reduce the menstrual blood remaining on a top sheet etc. is provided.

Drawing 1 is a front view of absorptive article 1 (sanitary napkin) which is one of the embodiments of an absorptive article of the present invention. Drawing 2 is a mimetic diagram showing the device used in order to manufacture nonwoven fabric 8 used with the absorptive article of the present invention. FIG. 3 is a schematic diagram showing the structure of the card machine 9 in the apparatus shown in FIG. FIG. 4 is a diagram for explaining a method of manufacturing the absorbent article 1 (sanitary napkin). FIG. 5 is an electron micrograph of the skin contact surface of the top sheet in a sanitary napkin in which the top sheet contains tri-C2L oil fatty acid glycerides. FIG. 6 is a photomicrograph of menstrual blood with or without a blood slipping agent. FIG. 7 is a diagram for explaining a method of measuring the surface tension.

<Definition>
Some of the terms used in this specification are defined.

・ "Excretion mouth contact area"
In this specification, the “excretion opening contact area” of the top sheet means an area in the top sheet that comes into contact with the wearer's excretion opening (small labia or the like). The position of the excretory opening contact area varies depending on the size or the like of the absorbent article, but in the case of an absorbent article having a side flap, generally, the longitudinal direction passing through the center in the width direction of the absorbent article. The inside of the area defined by the embossing that is continuously or discontinuously arranged so as to surround the direction line and the intersection of the width direction line passing through the longitudinal center of both wings is the excretory opening contact area is there. Further, in the case of an absorbent article that does not have a wallet, generally, by an embossing that is arranged continuously or discontinuously so as to surround the center part in the width direction and the center part in the longitudinal direction of the absorbent article. Although defined, it is an excretory opening contact area.

  In addition to the top sheet, the absorbent article according to the present invention may include a second sheet between the top sheet and the absorbent body, but the second sheet may have an excretory opening contact area. In that case, the excretion opening contact area of the second sheet means a range overlapping with the excretion opening contact area of the top sheet in the thickness direction of the absorbent article.

・ "Front" and "Back"
In this specification, “front” and “rear” refer to the wearer's front and the wearer's rear, respectively, based on the wearer.

・ "Skin side" and "Clothing side"
“Skin side surface” relating to a liquid-permeable top sheet, second sheet, and the like means a surface facing the wearer's skin side when worn. Similarly, “clothing side surface” means a surface facing the wearer's clothing side when worn. For example, the clothing side surfaces of the top sheet and the second sheet mean the surfaces of the top sheet and the second sheet on the back sheet side, respectively. The skin side surface of the top sheet is synonymous with the skin contact surface.

・ "Blood slipperiness agent containing area"
In this specification, the “blood slipperiness-imparting agent-containing region” relating to the topsheet means a region in which the topsheet contains the blood slipperiness-imparting agent in the excretory opening contact region. The top sheet may have a blood slipperiness-imparting agent-containing region in a part of the excretion opening contact area, and may have a blood slippage imparting agent-containing region in the entire excretion opening contact area. . Furthermore, the top sheet may have a blood slipperiness imparting agent-containing region also in the excretory opening non-contact region beyond the excretion port contact region.

  In the present specification, the second sheet can also have a blood slipping agent-containing region. As in the case of the top sheet, the “blood slipperiness-imparting agent-containing region” for the second sheet means a region where the second sheet contains the blood slipperiness-imparting agent in the excretion opening contact region. A blood slipperiness-imparting agent-containing region can be provided in a part or all of the mouth contact region, and a blood slipperiness-imparting agent-containing region may also be provided in the excretory opening non-contact region.

<Absorbent article>
Hereinafter, the absorbent article of the present invention will be described in detail.

The absorbent article according to the present invention includes a nonwoven fabric topsheet containing at least a heat-fusible conjugate fiber, and the ratio of the fiber orientation along the machine direction and the fiber orientation along the width direction of the nonwoven topsheet. Absorbent article having a (machine direction / width direction) of 1.0 to 7.0, and the non-woven top sheet is 0.01 to 80 mm ² / s at 40 ° C. in the excretory opening contact region. Absorbency having a blood slipperiness-containing agent-containing region including a blood slipperiness-imparting agent having a kinematic viscosity, a water retention of 0.01 to 4.0% by mass, and a weight average molecular weight of less than 1,000 It is an article. The nonwoven fabric contained in the absorbent article according to the present invention only needs to contain at least a heat-fusible conjugate fiber, and the content of the heat-fusible conjugate fiber may or may not be 100%. The heat-fusible conjugate fiber may or may not have heat extensibility.

  In the absorbent article of the present invention, it is preferable that the ratio (machine direction / width direction) of the fiber orientation along the machine direction and the fiber orientation along the width direction is 1.0 to 4.0.

  In the absorbent article of the present invention, the top sheet preferably further contains heat-extensible fibers.

  In the absorbent article of the present invention, the mixing ratio (the former / the latter) of the heat-fusible conjugate fiber and the heat-extensible fiber is preferably 20/80 to 80/20 by mass ratio.

  In the absorbent article of the present invention, the IOB of the blood slipperiness imparting agent is preferably an IOB of 0.00 to 0.60.

In the absorbent article of the present invention, the blood slipperiness imparting agent includes the following (i) to (iii):
(I) hydrocarbons,
(Ii) from (ii-1) a hydrocarbon moiety and (ii-2) a carbonyl group (—CO—) and an oxy group (—O—) inserted between the C—C single bonds of the hydrocarbon moiety. A compound having one or more identical or different groups selected from the group consisting of: (iii) (iii-1) a hydrocarbon moiety, and (iii-2) a CC single bond of the hydrocarbon moiety One or a plurality of the same or different groups selected from the group consisting of a carbonyl group (—CO—) and an oxy group (—O—), and (iii-3) a hydrogen atom of the hydrocarbon moiety, A compound having one or a plurality of the same or different groups selected from the group consisting of a carboxyl group (—COOH) and a hydroxyl group (—OH),
As well as selected from the group consisting of any combination thereof,
Here, in the compound of (ii) or (iii), when two or more oxy groups are inserted, it is preferable that each oxy group is not adjacent.

In the absorbent article of the present invention, the blood slipperiness imparting agent includes the following (i ′) to (iii ′):
(I ′) hydrocarbon,
(Ii ′) (ii′-1) a hydrocarbon moiety and (ii′-2) a carbonyl bond (—CO—), an ester bond (—COO— inserted between the C—C single bonds of the hydrocarbon moiety. ), A carbonate bond (—OCOO—), and an ether bond (—O—), one or more compounds having the same or different bonds, and (iii ′) (iii′-1 ) A hydrocarbon moiety and (iii′-2) a carbonyl bond (—CO—), an ester bond (—COO—), a carbonate bond (—OCOO—) inserted between the C—C single bonds of the hydrocarbon moiety. And a carboxyl group (—COOH) that replaces one or more of the same or different bonds selected from the group consisting of an ether bond (—O—) and a hydrogen atom of the hydrocarbon moiety (iii′-3) And a hydroxyl group (-O H) a compound having one or more identical or different groups selected from the group consisting of
As well as selected from the group consisting of any combination thereof,
Here, in the compound of (ii ′) or (iii ′), when two or more identical or different bonds are inserted, it is preferable that each bond is not adjacent.

In the absorbent article of the present invention, the blood slipperiness imparting agent includes the following (A) to (F):
(A) (A1) a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms in the chain hydrocarbon moiety, (A2) a chain hydrocarbon moiety, and a chain carbonization An ester with a compound having one carboxyl group replacing a hydrogen atom of the hydrogen moiety,
(B) (B1) a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms in the chain hydrocarbon moiety, (B2) a chain hydrocarbon moiety, and a chain carbonization An ether with a compound having one hydroxyl group replacing a hydrogen atom of the hydrogen moiety,
(C) (C1) a carboxylic acid, a hydroxy acid, an alkoxy acid or an oxo acid containing a chain hydrocarbon moiety and 2 to 4 carboxyl groups that replace a hydrogen atom of the chain hydrocarbon moiety, and (C2 ) An ester of a chain hydrocarbon moiety and a compound having a hydroxyl group replacing a hydrogen atom of the chain hydrocarbon moiety;
(D) an ether bond (—O—), a carbonyl bond (—CO—), an ester bond (—COO—) inserted between the chain hydrocarbon moiety and the C—C single bond of the chain hydrocarbon moiety. And a compound having any one bond selected from the group consisting of a carbonate bond (—OCOO—),
(E) polyoxy C ₃ -C ₆ alkylene glycol or its alkyl ester or alkyl ether, and (F) a chain hydrocarbon,
As well as selected from the group consisting of any combination thereof.

In the absorbent article of the present invention, the blood slipperiness-imparting agent comprises (a ₁ ) an ester of a chain hydrocarbon tetraol and at least one fatty acid, (a ₂ ) a chain hydrocarbon triol and at least one fatty acid. An ester, (a ₃ ) an ester of a chain hydrocarbon diol and at least one fatty acid, (b ₁ ) an ether of a chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol, (b ₂ ) a chain carbonization Ether of hydrogen triol and at least one aliphatic monohydric alcohol, (b ₃ ) ether of chain hydrocarbon diol and at least one aliphatic monohydric alcohol, (c ₁ ) chain having four carboxyl groups hydrocarbon tetracarboxylic acid, hydroxy acids, esters of alkoxy acids or oxoacids, and at least one aliphatic monohydric alcohol, (c ₂₎ 3 one carboxyl Chain hydrocarbon tricarboxylic acid having, hydroxy acids, esters of alkoxy acids or oxoacids, and at least one aliphatic monohydric alcohol, (c ₃₎ a chain hydrocarbon dicarboxylic acids having two carboxyl groups, hydroxy An ester of an acid, an alkoxy acid or an oxo acid and at least one aliphatic monohydric alcohol, (d ₁ ) an ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, (d ₂ ) a dialkyl ketone, (d ₃ ) An ester of a fatty acid and an aliphatic monohydric alcohol, (d ₄ ) a dialkyl carbonate, (e ₁ ) a polyoxy C ₃ -C ₆ alkylene glycol, (e ₂ ) a polyoxy C ₃ -C ₆ alkylene glycol and at least one fatty acid ester, (e ₃₎ polyoxy C ₃ -C ₆ alkylene glycol and at least one aliphatic monohydric alcohol Ethers of, and (f ₁₎ a chain alkane, and is preferably selected from the group consisting of any combination thereof.

(Blood slipperiness agent)
The blood slipperiness imparting agent contained in the absorbent article according to the present invention will be described below. The blood slipperiness imparting agent has a kinematic viscosity at 40 ° C. of about 0.01 to about 80 mm ² / s, a water retention of about 0.05 to about 4.0% by mass, and a weight average molecular weight of about 1. Less than 1,000.

The kinematic viscosity at 40 ° C. of the blood slipperiness-imparting agent can be appropriately adjusted in the range of about 0 to about 80 mm ² / s, preferably about 1 to about 70 mm ² / s, more preferably about 3 to about 60 mm ² / s, even more preferably from about 5 to about 50 mm ² / s, and even more preferably from about 7 to about 45 mm ² / s. In this specification, the kinematic viscosity at 40 ° C. may be simply referred to as “kinematic viscosity”.

  The kinematic viscosity is as follows: a) as the molecular weight of the blood slipperiness-imparting agent increases, b) polar groups such as carbonyl bond (—CO—), ether bond (—O—), carboxyl group (—COOH), hydroxyl group ( The higher the ratio of -OH), etc., and c) the higher the IOB, the higher the tendency.

In order to have a kinematic viscosity of about 0 to about 80 mm ² / s at 40 ° C., the melting point of the blood slipperiness imparting agent is preferably 45 ° C. or less. This is because when the blood slipperiness-imparting agent contains crystals at 40 ° C., the kinematic viscosity tends to increase.

The significance of kinematic viscosity in the blood slipperiness-imparting agent will be described later. When the kinematic viscosity exceeds about 80 mm ² / s, the blood slipperiness-imparting agent is too viscous to reach the skin contact surface of the top sheet. At the same time, it tends to be difficult to slide from the convex portion to the concave portion and then to move into the absorber.

  The kinematic viscosity can be measured at a test temperature of 40 ° C. using a Canon Fenceke reverse flow viscometer according to “5. Kinematic viscosity test method” of JIS K 2283: 2000.

  The water retention rate of the blood slipperiness-imparting agent can be appropriately adjusted in the range of about 0.01 to about 4.0% by mass, preferably about 0.02 to about 3.5% by mass, more preferably About 0.03 to about 3.0% by weight, even more preferably about 0.04 to about 2.5% by weight, and even more preferably about 0.05 to about 2.0% by weight.

In the present specification, the “water retention” means the ratio (mass) of water that a substance can hold, and can be measured as follows.
(1) Place a 20 mL test tube, a rubber stopper, a substance to be measured, and deionized water in a constant temperature room at 40 ° C. overnight.
(2) In a constant temperature room, 5.0 g of a substance to be measured and 5.0 g of deionized water are put into a test tube.
(3) Put a rubber stopper on the mouth of the test tube in a thermostatic chamber, rotate the test tube once, and let it stand for 5 minutes.
(4) In a thermostatic chamber, 3.0 g of the substance layer to be measured (usually the upper layer) is collected in a glass petri dish having a diameter of 90 mm and a mass of W ₀ (g).
(5) The petri dish is heated in an oven at 105 ° C. for 3 hours to evaporate water, and the whole petri dish is measured for mass: W ₁ (g).
(6) The water retention rate is calculated according to the following formula.
Water retention (mass%) = 100 × [W ₀ (g) −W ₁ (g)] / 3.0 (g),
The measurement is carried out three times and the average value is adopted.

  Although the significance of the water retention rate in the blood slipperiness-imparting agent will be described later, when the water retention rate decreases, the affinity between the blood slipperiness-imparting agent and menstrual blood decreases and reaches the skin contact surface of the top sheet. There is a tendency that it becomes difficult to transfer to the absorbent body with the menstrual blood. On the other hand, when the water retention rate becomes high, the affinity with menstrual blood becomes very high like a surfactant, and the absorbed blood remains on the skin contact surface of the top sheet, and the skin contact of the top sheet The surface tends to be red and easily colored.

  The water retention rate is as follows: a) the smaller the molecular weight of the blood slipperiness agent, and b) polar groups such as carbonyl bond (—CO—), ether bond (—O—), carboxyl group (—COOH), hydroxyl As the ratio of the group (—OH) or the like is higher, the value tends to increase. This is because the blood slipperiness imparting agent is more hydrophilic. Further, the water retention rate tends to increase as the IOB increases, that is, as the inorganic value increases and as the organic value decreases. This is because the blood slipperiness-imparting agent is more hydrophilic.

  The significance of the kinematic viscosity and the water retention rate in the blood slipping agent will be described.

  When menstrual blood excreted from the wearer reaches the excretory opening contact region, it contacts the blood slipperiness imparting agent present in the convex part, slides into the concave part together with this, passes through the top sheet, and moves to the absorber. .

More specifically, the blood slipperiness-imparting agent having a kinematic viscosity of about 0.01 to about 80 mm ² / s at 40 ° C. has a very low viscosity near the body temperature of the wearer and a certain affinity with menstrual blood. Therefore, it is considered that menstrual blood can slide from the convex part to the concave part together with menstrual blood, and can pass through the top sheet and quickly migrate to the absorbent body using the momentum at the time of the sliding. . Further, the blood slipperiness imparting agent present in the convex part has a water retention of about 0.01 to about 4.0% by mass, and therefore has an affinity for mainly hydrophilic components (plasma and the like) in menstrual blood. Therefore, it is considered that menstrual blood hardly remains on the top sheet.

  If there is a large amount of menstrual blood discharged from the wearer, even if the kinetic energy of menstrual blood itself is large and the kinematic viscosity value of the blood slipperiness-imparting agent is relatively high, it is difficult to slip with menstrual blood. Even if the water retention value is relatively high and the affinity with the hydrophilic component of menstrual blood is high, the weight molecular weight value is relatively high and difficult to slide with menstrual blood, and the top sheet Even when there is no uneven structure on the skin contact surface, it is considered that menstrual blood easily migrates to the absorber.

  On the other hand, when the amount of menstrual blood discharged from the wearer is small, menstrual blood has a low kinetic energy, and menstrual blood that has reached the skin contact surface of the top sheet tends to stay on the spot. Accordingly, the blood slipperiness-imparting agent slides down from the convex part to the concave part together with menstrual blood, and draws menstrual blood into the top sheet, and then draws it into the absorber, thereby rapidly transferring menstrual blood to the absorber. be able to.

  The blood slipperiness agent has a weight average molecular weight of less than about 1,000, and preferably has a weight average molecular weight of less than about 900. This is because if the weight average molecular weight is about 1,000 or more, the blood slipperiness-imparting agent itself has tackiness and tends to give the wearer discomfort. In addition, since the viscosity of the blood slipperiness-imparting agent tends to increase as the weight average molecular weight increases, it becomes difficult to lower the viscosity of the blood slipperiness-imparting agent to a viscosity suitable for coating by heating, As a result, the blood slipping agent may have to be diluted with a solvent.

  The blood slipperiness-imparting agent preferably has a weight average molecular weight of about 100 or more, and more preferably has a weight average molecular weight of about 200 or more. This is because when the weight average molecular weight is small, the vapor pressure of the blood slipperiness imparting agent becomes high and vaporizes during storage, causing problems such as a decrease in the amount and odor when worn.

In the present specification, “weight average molecular weight” refers to a polydispersed compound (for example, a compound produced by sequential polymerization, a plurality of fatty acids, and an ester produced from a plurality of aliphatic monohydric alcohols). , A concept that includes a single compound (eg, an ester formed from one fatty acid and one aliphatic monohydric alcohol), and N _i molecules of molecular weight M _i (i = 1, or i = 1, 2, ...), the following formula:
M _w = ΣN _i M _i ² / ΣN _i M _i
Means M _w obtained by

In this specification, a weight average molecular weight means the value of polystyrene conversion calculated | required by gel permeation chromatography (GPC).
Examples of GPC measurement conditions include the following.
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: 1.0 mL / min Driving amount: 100 μL
Detection: RI (differential refractometer)
In addition, the weight average molecular weight described in the Example of this specification is measured on the said conditions.

The blood slipperiness agent can have an IOB of about 0.00 to about 0.60.
IOB (Inorganic Organic Balance) is an index indicating a balance between hydrophilicity and lipophilicity. In the present specification, the following formula by Oda et al.
IOB = value calculated by inorganic value / organic value.

Inorganic values and organic values are reported in the field of chemistry, Vol. 11, no. 10 (1957) p. 719-725).
Table 1 below summarizes the organic and inorganic values of the major groups by Mr. Fujita.

For example, in the case of an ester of tetradecanoic acid having 14 carbon atoms and dodecyl alcohol having 12 carbon atoms, the organic value is 520 (CH ₂ , 20 × 26), and the inorganic value is 60 (—COOR, 60 × 1), so that IOB = 0.12.

  In the blood slipping agent, the IOB is preferably about 0.00 to about 0.60, more preferably about 0.00 to about 0.50, and about 0.00 to about 0.40. And more preferably from about 0.00 to about 0.30. This is because when the IOB is in the above range, the water holding power and kinematic viscosity easily satisfy the above requirements.

  The blood slipperiness-imparting agent preferably has a melting point of 45 ° C. or lower, and more preferably has a melting point of 40 ° C. or lower. This is because when the blood slipperiness-imparting agent has a melting point of 45 ° C. or less, the blood slipperiness-imparting agent tends to have a kinematic viscosity in the above range.

  In the present specification, the “melting point” means a peak top temperature of an endothermic peak when changing from a solid state to a liquid state when measured with a differential scanning calorimeter at a temperature rising rate of 10 ° C./min. The melting point can be measured using, for example, a DSC-60 type DSC measuring apparatus manufactured by Shimadzu Corporation.

  The blood lubricity-imparting agent may be liquid at room temperature (about 25 ° C.) or solid as long as it has a melting point of about 45 ° C. or lower, ie, a melting point of about 25 ° C. or higher, or It may be less than about 25 ° C. and may have a melting point of, for example, about −5 ° C., about −20 ° C., etc.

  The blood slipperiness imparting agent has a lower melting point, but preferably has a low vapor pressure. The vapor pressure of the blood slipperiness-imparting agent is preferably about 0 to about 200 Pa, more preferably about 0 to about 100 Pa, and further about 0 to about 10 Pa at 25 ° C. (1 atm). More preferably, it is about 0 to about 1 Pa, and even more preferably about 0.0 to about 0.1 Pa.

  Considering that the absorbent article of the present invention is used in contact with a human body, the vapor pressure is preferably from about 0 to about 700 Pa at 40 ° C. (1 atm), and from about 0 to about 100 Pa. Is more preferably about 0 to about 10 Pa, even more preferably about 0 to about 1 Pa, and even more preferably about 0.0 to about 0.1 Pa. This is because if the blood slipperiness-imparting agent has a high vapor pressure, it may be vaporized during storage, resulting in problems such as a decrease in the amount and odor when worn.

  Further, the melting point of the blood slipperiness-imparting agent can be selected according to the climate, the length of wearing time, and the like. For example, in an area where the average temperature is about 10 ° C. or less, by adopting a blood slipperiness imparting agent having a melting point of about 10 ° C. or less, menstrual blood is excreted and then cooled by the ambient temperature. However, it is considered that the blood slipperiness-imparting agent is easy to function.

  Moreover, when the absorbent article is used for a long time, the melting point of the blood slipperiness imparting agent is preferably higher in the range of about 45 ° C. or less. This is because the blood slipperiness-imparting agent is not easily biased even when worn for a long time, and is not easily affected by sweat, friction at the time of wearing.

  In this technical field, the skin contact surface of the top sheet is coated with a surfactant for the purpose of changing the surface tension of menstrual blood and the like and quickly absorbing menstrual blood. However, the top sheet coated with a surfactant has a high affinity with hydrophilic components (such as plasma) in menstrual blood, and tends to attract them and rather cause menstrual blood to remain on the top sheet. Unlike conventionally known surfactants, the blood slipperiness imparting agent has a low affinity for menstrual blood, and can pass the menstrual blood to the absorbent body quickly without remaining on the top sheet.

The blood slipperiness imparting agent is preferably the following (i) to (iii),
(I) hydrocarbons,
(Ii) (ii-1) consisting of a hydrocarbon moiety and (ii-2) a carbonyl group (—CO—) and an oxy group (—O—) inserted between the C—C single bonds of the hydrocarbon moiety. A compound having one or more, the same or different groups, selected from the group, and (iii) (iii-1) a hydrocarbon moiety, and (iii-2) between the C—C single bonds of the hydrocarbon moiety One or a plurality of the same or different groups selected from the group consisting of a carbonyl group (—CO—) and an oxy group (—O—), and (iii-3) a hydrogen atom of the hydrocarbon moiety, A compound having one or a plurality of identical or different groups selected from the group consisting of a carboxyl group (—COOH) and a hydroxyl group (—OH) to be substituted;
As well as any combination thereof.

  In the present specification, “hydrocarbon” means a compound composed of carbon and hydrogen, and a chain hydrocarbon, for example, a paraffinic hydrocarbon (also referred to as an alkane, which does not include a double bond and a triple bond). , Olefinic hydrocarbons (including one double bond, also referred to as alkene), acetylenic hydrocarbons (including one triple bond, also referred to as alkyne), and the group consisting of double and triple bonds And hydrocarbons containing two or more bonds selected from the above, and cyclic hydrocarbons such as aromatic hydrocarbons and alicyclic hydrocarbons.

The hydrocarbon is preferably a chain hydrocarbon and an alicyclic hydrocarbon, more preferably a chain hydrocarbon, paraffinic hydrocarbon, olefinic hydrocarbon, and two or more double bonds. More preferably, it is a hydrocarbon that does not contain a triple bond, and more preferably it is a paraffinic hydrocarbon.
The chain hydrocarbon includes a straight chain hydrocarbon and a branched chain hydrocarbon.

  In the compounds (ii) and (iii), when two or more oxy groups (—O—) are inserted, the oxy groups (—O—) are not adjacent to each other. Therefore, the compounds (ii) and (iii) do not include compounds having a continuous oxy group (so-called peroxides).

  In the compound of (iii), at least one hydrogen atom of the hydrocarbon moiety is more preferably a hydroxyl group (—OH) than a compound in which at least one hydrogen atom of the hydrocarbon moiety is substituted with a carboxyl group (—COOH). ) Is preferred. This is because the carboxyl group binds to a metal or the like in menstrual blood, increases the water retention rate of the blood slipperiness imparting agent, and may exceed a predetermined range. This is the same from the viewpoint of IOB. As shown in Table 1, the carboxyl group binds to menstrual metals and the like, and the inorganic value increases significantly from 150 to 400 or more. Sometimes the value of IOB can be greater than about 0.60.

The blood slipperiness imparting agent is more preferably the following (i ′) to (iii ′),
(I ′) hydrocarbon,
(Ii ′) (ii′-1) a hydrocarbon moiety and (ii′-2) a carbonyl bond (—CO—), an ester bond (—COO— inserted between the C—C single bonds of the hydrocarbon moiety. ), A carbonate bond (—OCOO—), and an ether bond (—O—), one or more compounds having the same or different bonds, and (iii ′) (iii′-1 ) A hydrocarbon moiety and (iii′-2) a carbonyl bond (—CO—), an ester bond (—COO—), a carbonate bond (—OCOO—) inserted between the C—C single bonds of the hydrocarbon moiety. And a carboxyl group (—COOH) that replaces one or more of the same or different bonds selected from the group consisting of an ether bond (—O—) and a hydrogen atom of the hydrocarbon moiety (iii′-3) And a hydroxyl group (-O H) a compound having one or more identical or different groups selected from the group consisting of
As well as any combination thereof.

  In the compounds (ii ′) and (iii ′) above, when two or more identical or different bonds are inserted, that is, a carbonyl bond (—CO—), an ester bond (—COO—), a carbonate bond (— When two or more identical or different bonds selected from OCOO-) and ether bonds (-O-) are inserted, the bonds are not adjacent, and at least carbon is interposed between the bonds. One atom intervenes.

  More preferably, the blood slipperiness-imparting agent is more preferably about 1.8 or less carbonyl bonds (—CO—), 2 or less ester bonds (—COO—) per 10 carbon atoms, About 1.5 or less bonds (-OCOO-), about 6 or less ether bonds (-O-), about 0.8 or less carboxyl groups (-COOH), and / or hydroxyl groups (-OH) About 1.2 or less.

The blood slipperiness imparting agent is more preferably the following (A) to (F),
(A) (A1) a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms in the chain hydrocarbon moiety, (A2) a chain hydrocarbon moiety, and a chain carbonization An ester with a compound having one carboxyl group replacing a hydrogen atom of the hydrogen moiety,
(B) (B1) a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms in the chain hydrocarbon moiety, (B2) a chain hydrocarbon moiety, and a chain carbonization An ether with a compound having one hydroxyl group replacing a hydrogen atom of the hydrogen moiety,
(C) (C1) a carboxylic acid, a hydroxy acid, an alkoxy acid or an oxo acid containing a chain hydrocarbon moiety and 2 to 4 carboxyl groups that replace a hydrogen atom of the chain hydrocarbon moiety, and (C2 ) An ester of a chain hydrocarbon moiety and a compound having a hydroxyl group replacing a hydrogen atom of the chain hydrocarbon moiety;
(D) an ether bond (—O—), a carbonyl bond (—CO—), an ester bond (—COO—) inserted between the chain hydrocarbon moiety and the C—C single bond of the chain hydrocarbon moiety. And a compound having any one bond selected from the group consisting of a carbonate bond (—OCOO—),
(E) polyoxy C ₃ -C ₆ alkylene glycol or its alkyl ester or alkyl ether, and (F) a chain hydrocarbon,
As well as any combination thereof.
Hereinafter, the blood slipperiness imparting agent according to (A) to (F) will be described in detail.

[(A) (A1) a chain hydrocarbon moiety, a compound having 2 to 4 hydroxyl groups replacing hydrogen atoms in the chain hydrocarbon moiety, (A2) a chain hydrocarbon moiety, and a chain Esters with compounds having one carboxyl group replacing a hydrogen atom in the hydrocarbon moiety]
(A) (A1) a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms in the chain hydrocarbon moiety; (A2) a chain hydrocarbon moiety; Esters (hereinafter sometimes referred to as “compound (A)”) with a compound having one carboxyl group that substitutes a hydrogen atom of the hydrogen moiety have the above kinematic viscosity, water retention and weight average molecular weight. As long as it has, all the hydroxyl groups do not need to be esterified.

  (A1) As a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups substituting hydrogen atoms in the chain hydrocarbon moiety (hereinafter sometimes referred to as “compound (A1)”), For example, chain hydrocarbon tetraols such as alkane tetraols such as pentaerythritol, chain hydrocarbon triols such as alkane triols such as glycerin, and chain hydrocarbon diols such as alkane diols such as glycol Is mentioned.

(A2) Examples of the compound having a chain hydrocarbon moiety and one carboxyl group that replaces a hydrogen atom in the chain hydrocarbon moiety include, for example, one hydrogen atom on a hydrocarbon having one carboxyl group ( -COOH) substituted compounds, for example fatty acids.
Examples of the compound (A) include (a ₁ ) an ester of a chain hydrocarbon tetraol and at least one fatty acid, (a ₂ ) an ester of a chain hydrocarbon triol and at least one fatty acid, and (a ₃ ) Esters of chain hydrocarbon diols with at least one fatty acid.

[Ester of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid]
Examples of the ester of a chain hydrocarbon tetraol and at least one fatty acid include the following formula (1):
Tetraesters of pentaerythritol and fatty acids of the following formula (2):
Triesters of pentaerythritol and fatty acids of the following formula (3):
Diester of pentaerythritol and fatty acid of the following formula (4):
And monoesters of pentaerythritol and fatty acids.
(In the formula, R ^{1 to} R ⁴ are each a chain hydrocarbon)

As fatty acids (R ¹ COOH, R ² COOH, R ³ COOH, and R ⁴ COOH) constituting esters of pentaerythritol and fatty acids, esters of pentaerythritol and fatty acids have kinematic viscosity, water retention and weight average. as long as it satisfies the molecular weight requirement is not particularly limited, for example, saturated fatty acids, for example, saturated fatty acids C ₂ -C _30, for example, acetic acid (C ₂₎ (C ₂ indicates the number of carbon atoms, R ¹ C, R ² C, R ³ C or R ⁴ C, the same applies hereinafter), propanoic acid (C ₃ ), butanoic acid (C ₄ ) and isomers thereof such as 2-methylpropanoic acid ( C ₄ ), pentanoic acid (C ₅ ) and isomers thereof such as 2-methylbutanoic acid (C ₅ ), 2,2-dimethylpropanoic acid (C ₅ ), hexanoic acid (C ₆ ), heptanoic acid (C ₇ ), octanoic acid (C ₈₎ Beauty isomers thereof, e.g., 2-ethylhexanoic acid (C _8), nonanoic acid (C _9), 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 these isomers not listed.

The fatty acid can also be an unsaturated fatty acid. Examples of unsaturated fatty acids include C _{3 to} C ₂₀ unsaturated fatty acids such as monounsaturated fatty acids such as crotonic acid (C ₄ ), myristoleic acid (C ₁₄ ), palmitoleic acid (C ₁₆ ), and olein. Acids (C ₁₈ ), elaidic acid (C ₁₈ ), vaccenic acid (C ₁₈ ), gadoleic acid (C ₂₀ ), eicosenoic acid (C ₂₀ ), etc., diunsaturated fatty acids such as linoleic acid (C ₁₈ ), eicosadiene Triunsaturated fatty acids such as acids (C ₂₀ ) such as linolenic acid such as α-linolenic acid (C ₁₈ ) and γ-linolenic acid (C ₁₈ ), pinolenic acid (C ₁₈ ), eleostearic acid such as , 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 ), etc. Tetraunsaturated fatty acids such as stear Don acid (C _20), arachidonic acid (C _20), eicosatetraenoic acid (C _20), etc., penta unsaturated fatty acids, for example, bosseopentaenoic acid (C _18), such as eicosapentaenoic acid (C _20), as well as their Of the partial hydrogen adduct.

The ester of pentaerythritol and a fatty acid is preferably an ester of pentaerythritol and a fatty acid derived from a saturated fatty acid, that is, an ester of pentaerythritol and a saturated fatty acid, considering the possibility of modification by oxidation or the like. .
Further, the ester of pentaerythritol and fatty acid is preferably a diester, triester or tetraester, more preferably a triester or tetraester, and more preferably a tetraester from the viewpoint of reducing the water retention value. More preferably, it is an ester.

Considering from the viewpoint that the IOB is about 0.00 to about 0.60, in the tetraester of pentaerythritol and fatty acid, the total number of carbon atoms of the fatty acid constituting the tetraester of pentaerythritol and fatty acid, that is, the above formula In (1), the total number of carbon atoms of the R ¹ C, R ² C, R ³ C, and R ⁴ C moieties is preferably about 15 (when the total number of carbon atoms is 15, the IOB is 0.1. 60).

In the tetraester of pentaerythritol and a fatty acid, for example, pentaerythritol, hexanoic acid (C ₆ ), heptanoic acid (C ₇ ), octanoic acid (C ₈ ), for example, 2-ethylhexanoic acid (C ₈ ), nonane Examples include tetraesters with acid (C ₉ ), decanoic acid (C ₁₀ ) and / or dodecanoic acid (C ₁₂ ).

Considering from the viewpoint that the IOB is about 0.00 to about 0.60, in the triester of pentaerythritol and fatty acid, the total number of carbon atoms of the fatty acid constituting the triester of pentaerythritol and fatty acid, that is, the above formula In (2), the total number of carbon atoms in the R ¹ C, R ² C and R ³ C moieties is preferably about 19 or more (when the total number of carbon atoms is 19, IOB is 0.58). ).

Considering from the viewpoint that IOB is about 0.00 to about 0.60, in the diester of pentaerythritol and fatty acid, the total number of carbon atoms of the fatty acid constituting the diester of pentaerythritol and fatty acid, that is, the above formula (3 ), The total number of carbon atoms in the R ¹ C and R ² C moieties is preferably about 22 or more (when the total number of carbon atoms is 22, IOB is 0.59).

Considering from the viewpoint that IOB is about 0.00 to about 0.60, in the monoester of pentaerythritol and fatty acid, the number of carbon atoms of the fatty acid constituting the monoester of pentaerythritol and fatty acid, that is, the above formula (4 ), The number of carbon atoms in the R ¹ C moiety is preferably about 25 or more (when the number of carbon atoms is 25, IOB is 0.60).
In the calculation of IOB, the influence of double bond, triple bond, iso branch, and tert branch is not considered (the same applies hereinafter).

  Examples of commercially available esters of pentaerythritol and fatty acids include Unistar H-408BRS, H-2408BRS-22 (mixed product), and the like (manufactured by NOF Corporation).

[Ester of (a ₂ ) chain hydrocarbon triol and at least one fatty acid]
Examples of the ester of a chain hydrocarbon triol and at least one fatty acid include the following formula (5):
Triester of glycerin and fatty acid of the following formula (6):
Diesters of glycerin and fatty acids and the following formula (7):
(Wherein R ^{5 to} R ⁷ are each a chain hydrocarbon)
And monoesters of glycerin and fatty acids.

As fatty acids (R ⁵ COOH, R ⁶ COOH and R ⁷ COOH) constituting esters of glycerin and fatty acids, the esters of glycerin and fatty acids satisfy the requirements of kinematic viscosity, water retention and weight average molecular weight. If there is, there is no particular limitation, for example, fatty acids listed in “esters of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid”, that is, saturated fatty acids and unsaturated fatty acids, oxidation, etc. In view of the possibility of modification by the above, it is preferably an ester of glycerin and a fatty acid derived from a saturated fatty acid, that is, an ester of glycerin and a saturated fatty acid.

  Moreover, as ester of glycerol and a fatty acid, it is preferable that it is a diester or a triester from a viewpoint of making the value of a water retention small, and it is more preferable that it is a triester.

Triesters of glycerin and fatty acids are also called triglycerides, for example, triesters of glycerin and octanoic acid (C ₈ ), triesters of glycerin and decanoic acid (C ₁₀ ), glycerin and dodecanoic acid (C ₁₂ ). And triesters of glycerin with 2 or 3 fatty acids, and mixtures thereof.

Examples of triesters of glycerin and two or more fatty acids include triesters of glycerin and octanoic acid (C ₈ ) and decanoic acid (C ₁₀ ), glycerin, octanoic acid (C ₈ ), and decanoic acid. (C ₁₀ ) and triester with dodecanoic acid (C ₁₂ ), glycerin and octanoic acid (C ₈ ), decanoic acid (C ₁₀ ), dodecanoic acid (C ₁₂ ), tetradecanoic acid (C ₁₄ ), hexadecanoic acid ( And a triester with C ₁₆ ) and octadecanoic acid (C ₁₈ ).

Considering from the viewpoint that the melting point is about 45 ° C. or less, the triester of glycerin and a fatty acid is the total number of carbon atoms of the fatty acid constituting the triester of glycerin and a fatty acid, that is, in formula (5), R ⁵ C , R ⁶ C and R ⁷ C moieties preferably have a total carbon number of about 40 or less.

Considering from the viewpoint that the IOB is about 0.00 to about 0.60, in the triester of glycerin and fatty acid, the total number of carbon atoms of the fatty acid constituting the triester of glycerin and fatty acid, that is, formula (5) The total number of carbon atoms of the R ⁵ C, R ⁶ C and R ⁷ C moieties is preferably about 12 or more (when the total number of carbon atoms is 12, IOB is 0.60).
A triester of glycerin and a fatty acid is a so-called fat and is a component that can constitute a human body, and thus is preferable from the viewpoint of safety.

  Commercial products of triesters of glycerin and fatty acid include tricoconut oil fatty acid glyceride, NA36, panacet 800, panacet 800B and panacet 810S, and tri-C2L oil fatty acid glyceride and tri-CL oil fatty acid glyceride (manufactured by NOF Corporation). Etc.

Diesters of glycerin and fatty acids are also called diglycerides, for example, diesters of glycerin and decanoic acid (C ₁₀ ), diesters of glycerin and dodecanoic acid (C ₁₂ ), diesters of glycerin and hexadecanoic acid (C ₁₆ ). And diesters of glycerin and two fatty acids, and mixtures thereof.

Considering from the viewpoint that IOB is about 0.00 to about 0.60, in the diester of glycerin and fatty acid, the total number of carbon atoms of the fatty acid constituting the diester of glycerin and fatty acid, that is, in the formula (6), The total number of carbon atoms in the R ⁵ C and R ⁶ C moieties is preferably about 16 or more (when the total number of carbon atoms is 16, IOB is 0.58).

Monoesters of glycerin and fatty acids are also referred to as monoglycerides, and examples include glycerin octadecanoic acid (C ₁₈ ) monoester, glycerin docosanoic acid (C ₂₂ ) monoester, and the like.

Considering from the viewpoint that IOB is about 0.00 to about 0.60, in the monoester of glycerin and fatty acid, the number of carbon atoms of the fatty acid constituting the monoester of glycerin and fatty acid, that is, in the formula (7), The number of carbon atoms in the R ⁵ C moiety is preferably about 19 or more (when the number of carbon atoms is 19, IOB is 0.59).

[Ester of (a ₃ ) chain hydrocarbon diol and at least one fatty acid]
Examples of the ester of a chain hydrocarbon diol and at least one fatty acid include C _{2 to} C ₆ chain hydrocarbon diols such as C _{2 to} C ₆ glycols such as ethylene glycol, propylene glycol, and butylene glycol. , Monoester or diester of pentylene glycol or hexylene glycol and a fatty acid.

Specifically, as an ester of a chain hydrocarbon diol and at least one fatty acid, for example, the following formula (8):
R ⁸ COOC _k H _2k OCOR ⁹ (8)
(Wherein k is an integer from 2 to 6 and R ⁸ and R ⁹ are each a chain hydrocarbon)
A diester of a C ₂ -C ₆ glycol and a fatty acid, and the following formula (9):
R ⁸ COOC _k H _2k OH (9)
(Wherein k is an integer from 2 to 6 and R ⁸ is a chain hydrocarbon)
And monoesters of C ₂ -C ₆ glycols and fatty acids.

In the ester of C ₂ -C ₆ glycol and fatty acid, the fatty acid to be esterified (corresponding to R ⁸ COOH and R ⁹ COOH in formula (8) and formula (9)) is C ₂ -C ₆ glycol and The ester with a fatty acid is not particularly limited as long as it satisfies the requirements of kinematic viscosity, water retention and weight average molecular weight. For example, “(a ₁ ) a chain hydrocarbon tetraol and at least one fatty acid The fatty acids listed in “Ester”, that is, saturated fatty acids and unsaturated fatty acids are mentioned, and saturated fatty acids are preferred in consideration of the possibility of modification by oxidation or the like.

Considering from the viewpoint of setting the IOB to about 0.00 to about 0.60, in the diester of butylene glycol (k = 4) and a fatty acid represented by the formula (8), the carbon number of the R ⁸ C and R ⁹ C moieties Is preferably about 6 or more (when the total number of carbon atoms is 6, IOB is 0.60).

Considering from the viewpoint that IOB is about 0.00 to about 0.60, in the monoester of ethylene glycol (k = 2) and a fatty acid represented by formula (9), the carbon number of the R ⁸ C moiety is about It is preferably 12 or more (when the carbon number is 12, IOB is 0.57).

The esters of C ₂ -C ₆ glycol and fatty acids, in consideration of the potential for degradation by oxidation and the like, derived from saturated fatty acids, esters of C ₂ -C ₆ glycol and fatty acid, Nachi Suwa, C ₂ ~ An ester of C ₆ glycol and a saturated fatty acid is preferred.

As the ester of a C ₂ -C ₆ glycols and fatty acid esters from the viewpoint of reducing the value of the water holding percentage, from large glycol number of carbon atoms, a glycol and a fatty acid, for example, butylene glycol, pentylene An ester of glycol and fatty acid derived from glycol or hexylene glycol is preferable.
Furthermore, the ester of C ₂ -C ₆ glycol and a fatty acid is preferably a diester from the viewpoint of reducing the water retention value.
Examples of commercially available esters of C ₂ -C ₆ glycol and fatty acid include Compol BL and Compol BS (manufactured by NOF Corporation).

[(B) (B1) a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups substituting for hydrogen atoms in the chain hydrocarbon moiety, (B2) a chain hydrocarbon moiety, and a chain Ether with a compound having one hydroxyl group replacing a hydrogen atom of the hydrocarbon moiety]
(B) (B1) a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms in the chain hydrocarbon moiety, (B2) a chain hydrocarbon moiety, and a chain carbonization The ether (hereinafter sometimes referred to as “compound (B)”) with a compound having one hydroxyl group substituting a hydrogen atom in the hydrogen moiety has the above kinematic viscosity, water retention and weight average molecular weight. As long as it has, all the hydroxyl groups do not need to be etherified.

  (B1) As a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups substituting hydrogen atoms in the chain hydrocarbon moiety (hereinafter sometimes referred to as “compound (B1)”), What is enumerated as a compound (A1) in "Compound (A)", for example, a pentaerythritol, glycerol, and glycol are mentioned.

  Examples of the compound (B2) having a chain hydrocarbon moiety and one hydroxyl group substituting a hydrogen atom of the chain hydrocarbon moiety (hereinafter sometimes referred to as “compound (B2)”) include: A compound in which one hydrogen atom of a hydrocarbon is substituted with one hydroxyl group (—OH), for example, an aliphatic monohydric alcohol, for example, a saturated aliphatic monohydric alcohol and an unsaturated aliphatic monohydric alcohol Can be mentioned.

Examples of the saturated aliphatic monohydric alcohol include C _{1 to} C ₂₀ saturated aliphatic monohydric alcohols such as methyl alcohol (C ₁ ) (C ₁ represents the number of carbon atoms, the same shall apply hereinafter), ethyl alcohol (C ₂ ), propyl alcohol (C ₃ ) and isomers thereof such as isopropyl alcohol (C ₃ ), butyl alcohol (C ₄ ) and isomers thereof such as sec-butyl alcohol (C ₄ ) and tert-butyl alcohol ( C ₄ ), pentyl alcohol (C ₅ ), hexyl alcohol (C ₆ ), heptyl alcohol (C ₇ ), octyl alcohol (C ₈ ) and isomers thereof such as 2-ethylhexyl alcohol (C ₈ ), nonyl alcohol ( C _9), decyl alcohol (C _10), dodecyl alcohol (C _12), tetradecyl alcohol (C _14), hexyl Decyl alcohol (C _16), heptadecyl alcohol (C ₁₇₎ to, octadecyl alcohol (C _18), and eicosyl alcohol (C _20), and isomers thereof that are not listed.

  Examples of the unsaturated aliphatic monohydric alcohol include those obtained by substituting one of the C—C single bonds of the saturated aliphatic monohydric alcohol with a C═C double bond, for example, oleyl alcohol. It is commercially available from Rika Co., Ltd. under the names of the Rica Coal series and the Angelo All series.

Examples of the compound (B) include (b ₁ ) ethers of chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol, such as monoether, diether, triether and tetraether, preferably diether, triether. Ethers and tetraethers, more preferably triethers and tetraethers, and even more preferably tetraethers, ethers of (b ₂ ) chain hydrocarbon triols and at least one aliphatic monohydric alcohol, such as monoethers, diethers and Triethers, preferably diethers and triethers, and more preferably triethers, and (b ₃ ) ethers of chain hydrocarbon diols with at least one aliphatic monohydric alcohol, such as monoethers and diethers, and preferably Diether It is below.

Examples of ethers of chain hydrocarbon tetraols and at least one aliphatic monohydric alcohol include, for example, the following formulas (10) to (13):
(In the formula, R ^{10 to} R ¹³ are each a chain hydrocarbon.)
And tetraethers, triethers, diethers and monoethers of pentaerythritol and aliphatic monohydric alcohols.

Examples of ethers of chain hydrocarbon triols and at least one aliphatic monohydric alcohol include, for example, the following formulas (14) to (16):
(In the formula, R ^{14 to} R ¹⁶ are each a chain hydrocarbon.)
And triether, diether and monoether of glycerin and aliphatic monohydric alcohol.

As an ether of a chain hydrocarbon diol and at least one aliphatic monohydric alcohol, the following formula (17):
R ¹⁷ OC _n H _2n OR ¹⁸ (17)
(Wherein n is an integer from 2 to 6 and R ¹⁷ and R ¹⁸ are each a chain hydrocarbon)
A diether of a C ₂ -C ₆ glycol and an aliphatic monohydric alcohol, and the following formula (18):
R ¹⁷ OC _n H _2n OH (18)
(Wherein n is an integer from 2 to 6 and R ¹⁷ is a chain hydrocarbon)
And a monoether of a C ₂ -C ₆ glycol and an aliphatic monohydric alcohol.

Considering from the viewpoint that the IOB is about 0.00 to about 0.60, the tetraether of pentaerythritol and an aliphatic monohydric alcohol is aliphatic 1 constituting the tetraether of pentaerythritol and an aliphatic monohydric alcohol. The total number of carbon atoms of the hydric alcohol, that is, in the above formula (10), the total number of carbon atoms of the R ¹⁰ , R ¹¹ , R ¹² and R ¹³ moieties is preferably about 4 or more (the total number of carbon atoms is In the case of 4, the IOB is 0.44).

Considering from the viewpoint that IOB is about 0.00 to about 0.60, the triether of pentaerythritol and aliphatic monohydric alcohol is aliphatic 1 constituting the triether of pentaerythritol and aliphatic monohydric alcohol. The total number of carbon atoms of the monohydric alcohol, that is, in the above formula (11), the total number of carbon atoms of the R ¹⁰ , R ¹¹ and R ¹² portions is preferably about 9 or more (when the total number of carbon atoms is 9 IOB becomes 0.57).

Considering from the viewpoint that the IOB is about 0.00 to about 0.60, diether of pentaerythritol and aliphatic monohydric alcohol is an aliphatic monohydric alcohol constituting a diether of pentaerythritol and aliphatic monohydric alcohol. That is, in the above formula (12), the total number of carbon atoms in the R ¹⁰ and R ¹¹ moieties is preferably about 15 or more (when the total number of carbon atoms is 15, the IOB is 0). .60).

Considering from the viewpoint that the IOB is about 0.00 to about 0.60, the monoether of pentaerythritol and aliphatic monohydric alcohol is aliphatic 1 constituting the monoether of pentaerythritol and aliphatic monohydric alcohol. the number of carbon atoms of the polyhydric alcohol, i.e., in formula (13), the number of carbon atoms of R ¹⁰ moiety is preferably about 22 or more (when the number of carbon atoms is 22, IOB is 0.59).

Further, from the viewpoint of setting the IOB from about 0.00 to about 0.60, the triether of glycerin and aliphatic monohydric alcohol is aliphatic 1 constituting the triether of glycerin and aliphatic monohydric alcohol. In the formula (14), the total number of carbon atoms of the R ¹⁴ , R ¹⁵ and R ¹⁶ moieties is preferably about 3 or more (when the total number of carbon atoms is 3). , IOB becomes 0.50).

Considering from the viewpoint that IOB is about 0.00 to about 0.60, diether of glycerin and aliphatic monohydric alcohol is carbon of aliphatic monohydric alcohol constituting diether of glycerin and aliphatic monohydric alcohol. In the formula (15), the total number of carbon atoms in the R ¹⁴ and R ¹⁵ moieties is preferably about 9 or more (when the total number of carbon atoms is 9, the IOB is 0.58). Become).

Considering from the viewpoint that the IOB is about 0.00 to about 0.60, in the monoether of glycerin and aliphatic monohydric alcohol, the aliphatic monohydric alcohol constituting the monoether of glycerin and aliphatic monohydric alcohol In the formula (16), the carbon number of the R ¹⁴ moiety is preferably about 16 or more (when the carbon number is 16, IOB is 0.58).

Considering from the viewpoint that IOB is about 0.00 to about 0.60, in the diether of butylene glycol (n = 4) and aliphatic monohydric alcohol represented by the formula (17), R ¹⁷ and R ¹⁸ moieties The total number of carbons is preferably about 2 or more (when the total number of carbons is 2, IOB is 0.33).
Further, considering from the viewpoint of about 0.00 to about 0.60 the IOB, the monoether of ethylene glycol (n = 2) and the aliphatic monohydric alcohol represented by the formula (18), the R ¹⁷ moieties The number of carbon atoms is preferably about 8 or more (when the number of carbon atoms is 8, IOB is 0.60).

  The compound (B) can be produced by dehydrating and condensing the compound (B1) and the compound (B2) in the presence of an acid catalyst.

[(C) (C1) a carboxylic acid, a hydroxy acid, an alkoxy acid or an oxo acid containing a chain hydrocarbon moiety and 2 to 4 carboxyl groups replacing a hydrogen atom of the chain hydrocarbon moiety; C2) Esters of a compound having a chain hydrocarbon moiety and one hydroxyl group replacing a hydrogen atom of the chain hydrocarbon moiety]
(C) (C1) a carboxylic acid, a hydroxy acid, an alkoxy acid or an oxo acid containing a chain hydrocarbon moiety and 2 to 4 carboxyl groups that replace a hydrogen atom of the chain hydrocarbon moiety, and (C2 ) An ester (hereinafter sometimes referred to as “compound (C)”) of a compound having a chain hydrocarbon moiety and one hydroxyl group substituting a hydrogen atom of the chain hydrocarbon moiety is the above-mentioned All carboxyl groups may not be esterified as long as they have kinematic viscosity, water retention and weight average molecular weight.

  (C1) Carboxylic acid, hydroxy acid, alkoxy acid or oxo acid (hereinafter referred to as “compound (C1)” containing a chain hydrocarbon moiety and 2 to 4 carboxyl groups replacing the hydrogen atom of the chain hydrocarbon moiety. ) "May be referred to as, for example, a chain hydrocarbon carboxylic acid having 2 to 4 carboxyl groups, such as a chain hydrocarbon dicarboxylic acid, such as an alkanedicarboxylic acid, such as ethanedioic acid, Propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, octanedioic acid, nonanedioic acid and decanedioic acid, chain hydrocarbon tricarboxylic acid such as alkanetricarboxylic acid such as propanetriacid , Butanetriacid, pentanetriacid, hexanetriacid, heptanetriacid, octanetriacid, nonanetriacid and decanetriacid, and chain hydrocarbon tetracarboxylic Examples include acids such as alkanetetracarboxylic acids such as butanetetraacid, pentanetetraacid, hexanetetraacid, heptanetetraacid, octanetetraacid, nonanetetraacid and decanetetraacid.

In addition, the compound (C1) includes a chain hydrocarbon hydroxy acid having 2 to 4 carboxyl groups, for example, a chain chain having 2 to 4 carboxyl groups such as malic acid, tartaric acid, citric acid, and isocitric acid. Hydrocarbon alkoxy acids such as O-acetylcitric acid and chain hydrocarbon oxoacids having 2 to 4 carboxyl groups are included.
(C2) Examples of the compound having a chain hydrocarbon moiety and one hydroxyl group substituting a hydrogen atom of the chain hydrocarbon moiety include those listed in the section of “Compound (B)”, for example, fat Group monohydric alcohols.

As the compound (C), (c ₁ ) an ester of a linear hydrocarbon tetracarboxylic acid having 4 carboxyl groups, a hydroxy acid, an alkoxy acid or an oxo acid and at least one aliphatic monohydric alcohol, for example, Monoesters, diesters, triesters and tetraesters, preferably diesters, triesters and tetraesters, more preferably triesters and tetraesters, and even more preferably tetraesters, (c ₂ ) a chain having three carboxyl groups Esters of hydrocarbon tricarboxylic acids, hydroxy acids, alkoxy acids or oxo acids with at least one aliphatic monohydric alcohol, such as monoesters, diesters and triesters, preferably diesters and triesters, and more preferably triesters And ( ₃₎ chain hydrocarbon dicarboxylic acids having two carboxyl groups, hydroxy acids, esters of alkoxy acids or oxoacids, and at least one aliphatic monohydric alcohol, for example, mono- and diesters, preferably include diester It is done.
Examples of compound (C) include dioctyl adipate, tributyl O-acetylcitrate and the like, and are commercially available.

[(D) an ether bond (—O—), a carbonyl bond (—CO—), an ester bond (—COO— inserted between a chain hydrocarbon moiety and a C—C single bond of the chain hydrocarbon moiety. , And any one bond selected from the group consisting of carbonate bonds (—OCOO—)]
(D) an ether bond (—O—), a carbonyl bond (—CO—), an ester bond (—COO—) inserted between the chain hydrocarbon moiety and the C—C single bond of the chain hydrocarbon moiety. And a compound having any one bond selected from the group consisting of a carbonate bond (—OCOO—) (hereinafter sometimes referred to as “compound (D)”), (d ₁ ) aliphatic 1 And ethers of monohydric alcohols and aliphatic monohydric alcohols, (d ₂ ) dialkyl ketones, (d ₃ ) esters of fatty acids and aliphatic monohydric alcohols, and (d ₄ ) dialkyl carbonates.

[(D ₁ ) Ether of aliphatic monohydric alcohol and aliphatic monohydric alcohol]
As an ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, the following formula (19):
R ¹⁹ OR ²⁰ (19)
(In the formula, R ¹⁹ and R ²⁰ are each a chain hydrocarbon)
The compound which has is mentioned.

As the aliphatic monohydric alcohol constituting the ether (corresponding to R ¹⁹ OH and R ²⁰ OH in the formula (19)), the ether satisfies the above-mentioned requirements for kinematic viscosity, water retention and weight average molecular weight. If it is a thing, it will not restrict | limit in particular, For example, the aliphatic monohydric alcohol enumerated by the term of "compound (B)" is mentioned.

[(D ₂ ) dialkylketone]
As the dialkyl ketone, the following formula (20):
R ²¹ COR ²² (20)
(Wherein R ²¹ and R ²² are each an alkyl group)
The compound which has is mentioned.
In addition to being commercially available, the dialkyl ketone can be obtained by a known method, for example, by oxidizing a secondary alcohol with chromic acid or the like.

[(D ₃ ) ester of fatty acid and aliphatic monohydric alcohol]
Examples of the ester of a fatty acid and an aliphatic monohydric alcohol include the following formula (21):
R ²³ COOR ²⁴ (21)
(Wherein R ²³ and R ²⁴ are each a chain hydrocarbon)
The compound which has is mentioned.

Examples of the fatty acid constituting the ester (corresponding to R ²³ COOH in the formula (21)) include, for example, the fatty acids listed in “(a ₁ ) ester of chain hydrocarbon tetraol and fatty acid”, that is, Saturated fatty acids or unsaturated fatty acids are exemplified, and saturated fatty acids are preferred in consideration of the possibility of modification by oxidation or the like. Examples of the aliphatic monohydric alcohol constituting the ester (corresponding to R ²⁴ OH in formula (21)) include the aliphatic monohydric alcohols listed in the section “Compound (B)”.

Examples of esters of fatty acids and aliphatic monohydric alcohols include, for example, dodecanoic acid (C ₁₂ ), dodecyl alcohol (C ₁₂ ) ester, tetradecanoic acid (C ₁₄ ), dodecyl alcohol (C ₁₂ ) and Examples of commercially available esters of fatty acids and aliphatic monohydric alcohols include Electol WE20 and Electol WE40 (manufactured by NOF Corporation).

[(D ₄ ) dialkyl carbonate]
As the dialkyl carbonate, the following formula (22):
R ²⁵ OC (= O) OR ²⁶ (22)
(Wherein R ²⁵ and R ²⁶ are each an alkyl group)
The compound which has is mentioned.
The dialkyl carbonate is commercially available, and can be synthesized by a reaction of phosgene with an alcohol, a reaction of a formic chloride ester with an alcohol or an alcoholate, and a reaction of silver carbonate with an alkyl iodide.

Considering from the viewpoint of water retention, vapor pressure, etc., (d ₁ ) an ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, (d ₂ ) a dialkyl ketone, (d ₃ ) a fatty acid and an aliphatic monohydric alcohol And (d ₄ ) dialkyl carbonates preferably have a weight average molecular weight of about 100 or more, and more preferably about 200 or more.
In (d ₂ ) dialkyl ketone, when the total number of carbon atoms is about 8, for example, for 5-nonanone, the melting point is about −50 ° C., and the vapor pressure is about 230 Pa at 20 ° C.

[(E) polyoxy C ₃ -C ₆ alkylene glycol, or alkyl ester or alkyl ether thereof]
(E) Polyoxy C ₃ -C ₆ alkylene glycol, or alkyl ester or alkyl ether thereof (hereinafter sometimes referred to as compound (E)) includes (e ₁ ) polyoxy C ₃ -C ₆ alkylene glycol, (e ₂ ) Esters of polyoxy C ₃ -C ₆ alkylene glycol and at least one fatty acid; (e ₃ ) ethers of polyoxy C ₃ -C ₆ alkylene glycol and at least one aliphatic monohydric alcohol. This will be described below.

[(E ₁ ) polyoxy C ₃ -C ₆ alkylene glycol]
The polyoxy C ₃ -C ₆ alkylene glycol is any one selected from the group consisting of i) an oxy C ₃ -C ₆ alkylene skeleton, that is, an oxypropylene skeleton, an oxybutylene skeleton, an oxypentylene skeleton, and an oxyhexylene skeleton. A homopolymer having one 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) the above group Means a random copolymer having two or more skeletons selected from the above and having hydroxy groups at both ends.

The polyoxy C ₃ -C ₆ alkylene glycol has the following formula (23):
_{HO- (C m H 2m O)} n -H (23)
(In the formula, m is an integer of 3 to 6)
Is represented by

As a result of confirmation by the present inventor, polypropylene glycol (corresponding to a homopolymer of m = 3 in the formula (23)) satisfies the water retention requirement when the weight average molecular weight is less than about 1,000. I found nothing. Therefore, the range of the blood slipperiness-imparting agent does not include a homopolymer of polypropylene glycol, and propylene glycol is included in (e ₁ ) polyoxy C ₃ -C ₆ alkylene glycol as a copolymer or random polymer with other glycols. Should.

  As a result of confirmation by the present inventor, polyethylene glycol (corresponding to a homopolymer of m = 2 in the formula (23)) has a weight average molecular weight of less than 1,000 and satisfies the requirements for kinematic viscosity and water retention. It was suggested that it could not be satisfied.

  Considering from the viewpoint of setting the IOB from about 0.00 to about 0.60, for example, when the formula (23) is polybutylene glycol (m = 4 homopolymer), n ≧ about 7. Preferred (when n = 7, the IOB is 0.57).

Examples of commercial products of poly C ₃ -C ₆ alkylene glycol, e.g., UNIOL (TM) PB-500 and PB-700 (manufactured by NOF Corp.).

[(E ₂ ) ester of polyoxy C ₃ -C ₆ alkylene glycol and at least one fatty acid]
Examples of the ester of polyoxy C ₃ -C ₆ alkylene glycol and at least one fatty acid include the OH terminal of polyoxy C ₃ -C ₆ alkylene glycol described in the section “(e ₁ ) polyoxy C ₃ -C ₆ alkylene glycol”. One or both are esterified with fatty acids, ie monoesters and diesters.

Examples of the fatty acid to be esterified in the ester of polyoxy C ₃ -C ₆ alkylene glycol and at least one fatty acid are listed in “Ester of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid”. Fatty acid, that is, saturated fatty acid or unsaturated fatty acid, and saturated fatty acid is preferable in consideration of possibility of modification by oxidation or the like.

[(E ₃ ) ether of polyoxy C ₃ -C ₆ alkylene glycol and at least one aliphatic monohydric alcohol]
The ether of polyoxy C ₃ -C ₆ alkylene glycol and at least one aliphatic monohydric alcohol, polyoxy C ₃ -C ₆ alkylene glycol is described in the section "(e ₁₎ polyoxy C ₃ -C ₆ alkylene glycol" And those in which one or both of the OH ends are etherified with an aliphatic monohydric alcohol, that is, monoethers and diethers.
In the ether of polyoxy C ₃ -C ₆ alkylene glycol and at least one aliphatic monohydric alcohol, examples of the aliphatic monohydric alcohol to be etherified include, for example, the aliphatic compounds listed in the section of “Compound (B)”. A monohydric alcohol is mentioned.

[(F) chain hydrocarbon]
Examples of the chain hydrocarbon include (f ₁ ) chain alkanes such as straight chain alkanes and branched chain alkanes. The linear alkane has a carbon number of about 22 or less when the melting point is about 45 ° C. or less, and about 13 or less when the vapor pressure is about 0.01 Pa or less at 1 atm and 25 ° C. That's it. Branched-chain alkanes tend to have lower melting points at the same carbon number than straight-chain alkanes. Therefore, the branched chain alkane can include those having 22 or more carbon atoms even when the melting point is about 45 ° C. or lower. As a commercial item of hydrocarbons, for example, Pearl Ream 6 (NOF Corporation) can be mentioned.

  In one absorbent article of the embodiment of the present invention, the top sheet includes only the blood slipperiness imparting agent in the excretory opening contact area. In an absorbent article according to another embodiment of the present invention, a blood slipperiness-imparting agent-containing composition containing a blood slipperiness-imparting agent and at least one other component in the excretory opening contact area in the absorbent article according to another embodiment of the present invention. Including. Hereinafter, the blood slipping agent-containing composition will be described.

[Blood lubricity-containing composition]
The composition for containing a blood slipperiness agent contains the above-described blood slipperiness imparting agent and at least one other component. The at least one other component is not particularly limited as long as it does not hinder the effects of the present disclosure, and examples thereof include those that are conventionally applied to absorbent articles, particularly top sheets in the art.
Examples of the at least one other component include silicone oil, silicone, and silicone resin.
Examples of the at least one other component include antioxidants such as BHT (2,6-di-t-butyl-p-cresol), BHA (butylated hydroxyanisole), and propyl gallate. It is done.

Examples of the at least one other component include vitamins such as natural vitamins and synthetic vitamins. Examples of the vitamin include water-soluble vitamins such as vitamin B group, for example, vitamin B ₁ , vitamin B ₂ , vitamin B ₃ , vitamin B ₅ , vitamin B ₆ , vitamin B ₇ , vitamin B ₉ , vitamin B ₁₂ And vitamin C.
Examples of the vitamin include fat-soluble vitamins such as vitamin A group, vitamin D group, vitamin E group, and vitamin K group.
The vitamins also include their derivatives.

  Examples of the at least one other component include amino acids such as alanine, arginine, lysine, histidine, proline, hydroxyproline, and peptides.

Examples of the at least one other component include zeolites such as natural zeolites such as fluorite, chabazite, pyroxenite, natrolite, zeolitite, and somosonite, and synthetic zeolite.
Examples of the at least one other component include cholesterol, hyaluronic acid, lecithin, and ceramide.

Examples of the at least one other component include drugs such as skin astringents, anti-acne agents, anti-wrinkle agents, anti-cellulite agents, whitening agents, antibacterial agents, and antifungal agents.
Examples of the skin astringent include oil-soluble skin astringents such as zinc oxide, aluminum sulfate, and tannic acid, such as oil-soluble polyphenols. Examples of the oil-soluble polyphenols include natural oil-soluble polyphenols such as, for example, buckwheat extract, hypericum extract, nettle extract, chamomile extract, burdock extract, salvia extract, linden extract, scallop extract, birch extract, cedar extract, sage extract, salvia extract. , Teuchigurumi extract, hibiscus extract, loquat leaf extract, bodaiju extract, hop extract, marronnier extract, yokuinin extract and the like.

Examples of the anti-acne agent include salicylic acid, benzoyl peroxide, resorcinol, sulfur, erythromycin, and zinc.
Examples of the anti-wrinkle agent include lactic acid, salicylic acid, salicylic acid derivatives, glycolic acid, phytic acid, lipoic acid, and lysophosphatide acid.

Examples of the anti-cellulite agent include xanthine compounds such as aminophylline, caffeine, theophylline, theobromine and the like.
Examples of the whitening agent include niacinamide, kojic acid, arbutin, glucosamine and derivatives, phytosterol derivatives, ascorbic acid and derivatives thereof, and mulberry extract and placenta extract.

Examples of the at least one other component include an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizer, a fragrance, a pigment, a dye, a pigment, and a plant extract. Examples of the anti-inflammatory component include naturally-occurring anti-inflammatory agents, such as buttons, ogon, hypericum, chamomile, licorice, momonoha, mugwort, perilla extract, etc., synthetic anti-inflammatory agents, such as allantoin, dipotassium glycyrrhizinate, etc. It is done.
Examples of the pH adjuster include those for keeping the skin weakly acidic, such as malic acid, succinic acid, citric acid, tartaric acid, and lactic acid.
Examples of the pigment include titanium oxide.

  The blood slipping agent-containing composition preferably contains about 50 to about 99% by weight and about 1 to about 50% by weight, more preferably about 1% to about 50% by weight of the blood slipping agent and at least one other component, respectively. 60 to about 99 wt% and about 1 to about 40 wt%, more preferably about 70 to about 99 wt% and about 1 to about 30 wt%, even more preferably about 80 to about 99 wt% and about 1 to about 20% by weight, even more preferably from about 90 to 99% by weight and from about 1 to about 10% by weight, and even more preferably from about 95 to 99% by weight and from about 1 to about 5% by weight. This is from the viewpoint of the effect of the present disclosure.

It is preferable that the said blood slipperiness | lubricity imparting agent containing composition contains surfactant in the quantity or less derived from the hydrophilic treatment of a top sheet or a second sheet. More specifically, the blood slipping agent-containing composition contains a surfactant, preferably about 0.0 to about 1.0 g / m ² , more preferably about 0.0 to about 0.8 g / m ² . m ² , more preferably from about 0.1 to about 0.5 g / m ² , and even more preferably from about 0.1 to about 0.3 g / m ^{2 in} the basis weight range.
This is because as the amount of the surfactant increases, menstrual blood tends to remain on the top sheet. The surfactant does not have a water retention value. This is because there is no layer of material to be measured because it is miscible with water.

The blood slipping agent-containing composition preferably contains water, preferably about 0.0 to about 1.0 g / m ² , more preferably about 0.0 to about 0.8 g / m ² , and even more preferably about 0. From about 0.1 to about 0.5 g / m ² , and even more preferably from about 0.1 to about 0.3 g / m ² basis weight.
Since water reduces the absorption performance of an absorbent article, it is preferable that water is small.

The blood slipping agent-containing composition, like the blood slipping agent, preferably has a kinematic viscosity at 40 ° C. of about 0 to about 80 mm ² / s, and about 1 to about 70 mm. More preferably, it has a kinematic viscosity of ² / s, more preferably it has a kinematic viscosity of about 3 to about 60 mm ² / s, even more preferably it has a kinematic viscosity of about 5 to about 50 mm ² / s, Even more preferably, it has a kinematic viscosity of from about 7 to about 45 mm ² / s.
When the kinematic viscosity of the blood slipping agent-containing composition exceeds about 80 mm ² / s, the viscosity is high, and the blood slipping agent composition absorbs along with menstrual blood that has reached the skin contact surface of the top sheet. This is because it tends to be difficult to slide down inside the article.

  When the blood slipping agent-containing composition includes a component miscible with the blood slipping agent as the at least one other component, the other component preferably has a weight of less than about 1,000. Having an average molecular weight, and more preferably having a weight average molecular weight of less than about 900; This is because when the weight average molecular weight is about 1,000 or more, the blood slipperiness-imparting agent-containing composition itself is tacky and tends to give the wearer an uncomfortable feeling. Moreover, since the viscosity of the composition containing a blood slipperiness-imparting agent tends to increase as the weight average molecular weight increases, the viscosity of the blood slipperiness-enhancing agent composition is lowered to a viscosity suitable for application by heating. As a result, the blood slipping agent may have to be diluted with a solvent.

The blood slipping agent-containing composition has a water content of about 0.01 to about 4.0% by mass and a water content of about 0.02 to about 3.5% by mass. Preferably about 0.03 to about 3.0% by weight, more preferably about 0.04 to about 2.5% by weight, and more preferably More preferably, it has a water retention of about 0.05 to about 2.0 weight percent.
When the water retention rate is low, the affinity between the blood slipperiness-imparting agent composition and menstrual blood is reduced, and menstrual blood that has reached the skin contact surface of the top sheet is less likely to slide into the absorbent article. Tend.
In addition, when the said blood slipperiness | lubricity imparting agent containing composition contains a solid substance, it is preferable to remove them by filtration in the measurement of kinematic viscosity and a water retention.

  The kind and application of the absorbent article of the present invention are not particularly limited. Examples of the absorbent article include sanitary products and sanitary products such as sanitary napkins and panty liners, and these may be used for humans and non-human animals such as pets. The liquid to be absorbed by the absorbent article is not particularly limited, but is mainly liquid excrement such as menstrual blood. In addition, the absorbent article of the present invention does not require components such as an emollient and a fixing agent, unlike absorbent articles containing known skin care compositions, lotion compositions and the like.

  Hereinafter, preferred embodiments of an absorbent article according to the present invention will be described with reference to the drawings. In addition, the absorbent article of this invention is not limited to preferable embodiment demonstrated below within the range which does not deviate from the objective and main point of this invention.

  FIG. 1 is a front view of an absorbent article 1 according to one embodiment of the present invention, and more specifically, a front view of a sanitary napkin. FIG. 1 is a view observed from the skin side of the top sheet 2. An absorbent article 1 shown in FIG. 1 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet (not shown), and an absorbent body 3 between the top sheet 2 and the back sheet. The absorbent article 1 shown in FIG. 1 includes a pair of side flaps 4 for fixing the absorbent article 1 to a wearer's clothes, for example, shorts, on both sides in the longitudinal direction of the absorbent article 1.

  In the absorbent article 1 shown in FIG. 1, the left side is the front side. Further, in the absorbent article 1 shown in FIG. 1, the excretion opening contact area is an area defined by the four embosses 6 ′ in the blood slipperiness imparting agent-containing area 7, and the excretion opening of the top sheet 2 All of the contact area has the blood slipperiness imparting agent-containing region 7.

  Moreover, although the absorbent article 1 shown by FIG. 1 has the side sheet | seat 5 and the some embossing 6, the absorbent article of another embodiment of this invention does not have a side sheet | seat and / or embossing. May be. In the absorbent article shown in FIG. 1, the top sheet 2 is formed from a nonwoven fabric. However, in the absorbent article according to another embodiment of the present invention, the top sheet is formed from a woven cloth or an apertured film. Also good.

In the absorbent article 1 shown in FIG. 1, at least the excretion opening contact area of the top sheet 2 has a kinematic viscosity of 0.01 to 80 mm ² / s at 40 ° C. and a holding of 0.01 to 4.0% by mass. It has a blood slipperiness imparting agent-containing region 7 containing a blood slipperiness imparting agent having a water percentage and a weight average molecular weight of less than 1,000.

  As the top sheet 2, what is usually used in this technical field can be adopted without particular limitation. Other than that, for example, a sheet-like material having a structure that allows liquid to pass through, for example, an apertured film, A woven fabric, a nonwoven fabric, etc. are mentioned. Examples of the fibers constituting the woven fabric and the nonwoven fabric include natural fibers and chemical fibers. Examples of natural fibers include cellulose such as pulverized pulp and cotton. Examples of chemical fibers include rayon and fibrillar rayon. And regenerated cellulose, semi-synthetic cellulose such as acetate and triacetate, thermoplastic hydrophobic chemical fibers, and thermoplastic hydrophobic chemical fibers subjected to hydrophilic treatment.

  Examples of the thermoplastic hydrophobic chemical fiber include a single fiber such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET), and a group consisting of polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET). Examples thereof include at least two kinds of selected composite fibers and fibers made of PE and PP graft polymers. Examples of the nonwoven fabric include air-through nonwoven fabric, spunbond nonwoven fabric, point bond nonwoven fabric, spunlace nonwoven fabric, needle punch nonwoven fabric, melt blown nonwoven fabric, and combinations thereof (for example, SMS).

  As a 1st example of the absorber 3, what has the absorption core covered with the core wrap is mentioned. Examples of constituents of the absorbent core include hydrophilic fibers such as cellulose such as pulverized pulp and cotton, regenerated cellulose such as rayon and fibril rayon, semi-synthetic cellulose such as acetate and triacetate, particulate polymer, fibrous polymer, Examples thereof include thermoplastic hydrophobic chemical fibers, hydrophobized thermoplastic hydrophobic chemical fibers, and combinations thereof. Moreover, as a constituent element of the absorbent core, a superabsorbent polymer, for example, a granular material such as sodium acrylate copolymer can be cited.

  The core wrap is not particularly limited as long as it is liquid permeable and has a barrier property that does not allow the polymer absorber to permeate, and examples thereof include woven fabric and nonwoven fabric. Examples of the woven fabric and non-woven fabric include natural fibers, chemical fibers, and tissues.

  As a 2nd example of the absorber 3, what was formed from the absorption sheet or the polymer sheet is mentioned, It is preferable that the thickness is about 0.3 to about 10 mm. The absorbent sheet and polymer sheet can be used without particular limitation as long as they are usually used in absorbent articles such as sanitary napkins.

Back sheets (not shown) include films containing PE, PP, etc., breathable resin films, spunbond or spunlace nonwoven fabrics joined with breathable resin films, multi-layer nonwoven fabrics such as SMS Etc. Considering the flexibility of the absorbent article, for example, a low density polyethylene (LDPE) film having a basis weight of about 15 to about 40 g / m ² is preferable.

  Examples of the side sheet 5 include the same example as the liquid-permeable top sheet. The side flap 4 can be formed from a side sheet 5 and a liquid-impermeable back sheet 8, and can optionally have a reinforcing sheet, eg, paper, between them.

  When the liquid-permeable top sheet 2 is formed of a nonwoven fabric or a woven fabric, the blood slipperiness imparting agent (not shown) or the blood slipperiness imparting agent-containing composition (not shown) It is preferable not to block the gaps between the fibers, and the blood slipperiness imparting agent or blood slipperiness imparting agent-containing composition adheres to the surface of the nonwoven fabric or woven fabric in the form of droplets or particles, for example. Or can cover the surface of the fiber.

  On the other hand, when the liquid-permeable top sheet is formed from an apertured film, the blood slipperiness imparting agent or blood slipperiness imparting agent-containing composition preferably does not block the aperture of the apertured film, The blood slipperiness-imparting agent or blood slipperiness-enhancing agent-containing composition is, for example, adhered to the surface of the apertured film in the form of droplets or particles, or the surface of the film is not blocked by the aperture. Can be covered. This is because when the blood slipperiness-imparting agent or blood slipperiness-providing agent-containing composition closes the aperture of the apertured film, the absorbed liquid may be inhibited from transferring to the absorber.

  Further, the blood slipperiness-imparting agent or blood slipperiness-providing agent-containing composition preferably has a large surface area in order to slip with absorbed menstrual blood, and is present in the form of droplets or particles. Alternatively, the blood slipping agent-containing composition preferably has a small particle size. In another embodiment of the absorbent article of the present invention, the absorbent article has an absorbent body comprising a blood slipperiness-imparting agent or a blood slipperiness-imparting agent-containing composition.

  When the blood slipperiness-imparting agent or the composition containing the blood slipperiness-imparting agent is applied, for example, when the top sheet is a non-woven fabric or woven fabric formed from a synthetic resin, an apertured film, etc., these are hydrophilic. It is preferable that it is processed. As the hydrophilization treatment, a hydrophilic agent is coated on the surface of the fiber of the nonwoven fabric or woven fabric, or the surface of the apertured film, and the hydrophilic agent is mixed with a synthetic resin that is a raw material of the nonwoven fabric, woven fabric, apertured film or the like. And so on.

  Derived from the lipophilic region derived from the blood slipperiness-imparting agent on the top sheet 2 and the hydrophilic agent, because the material before applying the blood slipperiness-imparting agent or blood slipperiness imparting agent-containing composition has hydrophilicity Since the hydrophilic region to coexist sparsely, the blood slipperiness imparting agent or the blood slipperiness imparting agent-containing composition exhibits sliding performance, and menstrual blood is easily transferred to the absorber. is there.

  The blood slipping agent or the blood slipping agent-containing composition can also act as a lubricant. Therefore, when the top sheet 2 is a nonwoven fabric or a woven fabric, the blood slipperiness imparting agent or the blood slipperiness imparting agent-containing composition can reduce the friction between the fibers and improve the flexibility. When the top sheet is a resin film, the blood slipperiness imparting agent or the blood slipperiness imparting agent-containing composition can reduce friction between the top sheet and the skin.

  The non-woven fabric used in the absorbent article of the present invention contains two components having different melting points as constituent fibers and is subjected to a stretching treatment, and the non-thermally stretchable heat fusion that does not substantially extend its length by heating. It is preferable that the heat-stretchable fiber is a heat-stretchable fiber using a heat-stretchable fiber that is a fiber that includes a heat-fusible conjugate fiber that is made from a wearable conjugate fiber and that is elongated by heating.

The nonwoven fabric used in the absorbent article of the present invention containing the heat-extensible fiber and / or the heat-fusible conjugate fiber is a fiber in the web containing the heat-extensible fiber and / or the heat-fusible conjugate fiber. It can be obtained by heat-sealing the intersection point by air-through method. This web is manufactured by the card method. When a web is manufactured by the card method, in general, fibers are easily oriented in the machine direction of the web, and the fibers are not easily oriented in the width direction of the web. Therefore, also in the nonwoven fabric manufactured from the web obtained by the card method, the constituent fibers are oriented in the machine direction rather than in the width direction. As a result, in a general nonwoven fabric, the degree of orientation of the fibers in the machine direction and H _MD, when the degree of orientation of the fiber in the width direction and _{H CD, H MD / H CD} ( hereinafter things H _MD / H _CD Is also a large value exceeding 1. On the other hand, in the nonwoven fabric used in the absorbent article of the present invention, although the value of H _MD / H _CD exceeds 1, although the card web is used as the raw material, the value is higher than that of a general nonwoven fabric. Is also a small value. Specifically nonwoven fabric used in the absorbent article of the present invention, the value of H _MD / H _CD is 1.0 to 7.0, in particular become small as 1.0 to 4.0. This also characterizes the nonwoven fabric used in the absorbent article of the present invention.

The nonwoven fabric used in the absorbent article of the present invention is bulky and thick because the value of H _MD / H _CD in the nonwoven fabric used in the absorbent article of the present invention using card web as a raw material is within the above range. The passing speed of the liquid in the direction becomes high. The reason for this is as follows. In the card web which is a raw material of the nonwoven fabric used in the absorbent article of the present invention, the ratio H _MD / H _CD of the degree of fiber orientation in the machine direction and the width direction is the nonwoven fabric used in the absorbent article of the present invention. It is almost the same. That is, it is within the above-mentioned range. In a web having such an orientation degree ratio, the entanglement of the heat-fusible conjugate fiber alone, the entanglement of the heat-extensible fiber alone, or the entanglement of the heat-extensible fiber and the heat-fusible conjugate fiber. The degree of is high. On the other hand, in the web in which the orientation ratio is out of the above range, the fibers are preferentially oriented in either the machine direction or the width direction, so that the heat fusible conjugate fiber alone is entangled. The degree of entanglement of the heat-extensible fiber alone or the entanglement between the heat-extensible fiber and the heat-fusible composite fiber is lower than in the present invention. For example, when heat-treating a web having a high degree of entanglement between the heat-extensible fiber and the heat-fusible composite fiber, the heat-extensible fiber is stretched when viewed in the cross-section in the thickness direction of the web. It is effectively transmitted to the heat-fusible composite fiber intertwined with the heat-extensible fiber. As a result, due to the elongation of the heat-extensible fiber, the heat-fusible conjugate fiber entangled with the heat-extensible fiber moves in a direction away from the heat-extensible fiber, and the inter-fiber distance increases. In addition, when the heat stretchable fiber is stretched, the heat fusible conjugate fiber is deformed so as to protrude upward, and the heat fusible conjugate fiber also moves away from the heat extensible fiber. In addition, the distance between the fibers increases. For these reasons, the non-woven fabric used in the absorbent article of the present invention has a large inter-fiber distance when viewed in the thickness direction, and at the same time, the fibers are more directed in the thickness direction of the non-woven fabric. As a result, the passage speed of the liquid in the thickness direction is increased. In particular, the passage speed of highly viscous liquids such as menstrual blood and loose stool is increased. Therefore, the nonwoven fabric used in the absorbent article of the present invention is a constituent material of absorbent articles such as sanitary napkins and disposable diapers, in particular, a surface sheet that comes into contact with the skin of the wearer, and between the surface sheet and the absorbent body. It is preferably used as an intermediate sheet. Conventionally, controlling the orientation ratio of nonwoven fabric fibers itself has been performed in the technical field, but such control has the same mechanical properties such as tensile strength and tensile elasticity in the machine direction and width direction. The purpose was to be. However, it has not been considered at all to make the nonwoven fabric bulky by controlling the orientation ratio of the fibers of the card web containing the heat-extensible fibers and non-heat-extensible fibers as in the present invention. Further, in the nonwoven fabric using the air-through method, the ratio of the fiber orientation degree along the machine direction of the nonwoven fabric and the fiber orientation degree along the width direction is as small as the present invention, as far as the present inventors know. It was.

  From the viewpoint of making the above-described bulky effect more remarkable, the mixing ratio (the former / the latter) of the heat-extensible fibers and the heat-fusible conjugate fibers in the nonwoven fabric used in the absorbent article of the present invention is the mass ratio. It is preferably 20/80 to 80/20, more preferably 50/50 to 70/30.

The degree of fiber orientation in the nonwoven fabric used in the absorbent article of the present invention can be measured using a high-precision molecular orientation meter MOA-6004 of Oji Scientific Instruments. The measurement is performed with GAIN = 1.0. The test piece is cut into a rectangle of 90 mm in the machine direction (MD) and 90 mm in the width direction (CD). Put it in a dedicated sample folder so that MD and CD face the specified direction, and attach it to the measuring instrument. At this time, a sample folder suitable for the thickness of the test piece is used. The value of H _MD / H _CD in the present invention is a MOR value obtained under these measurement conditions.

  As described above, the heat-extensible fiber is made from a heat-extensible fiber, and the heat-extensible fiber is composed of a fiber that is elongated by application of heat. Accordingly, the heat-extensible fibers contained in the card web and the heat-extensible fibers contained in the nonwoven fabric obtained by heat-treating the card web are different when viewed as fibers. The heat-fusible conjugate fiber contains two components with different melting points, is stretched, and is made from a non-heat-stretchable heat-fusible conjugate fiber whose length does not substantially extend by heating. It is. This heat-fusible conjugate fiber has no substantial change before and after application of heat. That is, the heat-fusible conjugate fiber contained in the card web and the heat-fusible conjugate fiber contained in the nonwoven fabric obtained by heat-treating the card web are substantially the same. .

The nonwoven fabric used in the absorbent article of the present invention, which is characterized by being bulky, has a thickness of 0.5 to 3 mm, particularly 0, when this is used as a top sheet of the absorbent article, for example. It is preferably 7 to 3 mm. Further, the condition that the thickness is within this range, the nonwoven fabric used in the absorbent article of the present invention preferably has a basis weight of 10 to 80 g / m ^2, in particular 15 to 60 g / m ^2. The apparent density of the nonwoven fabric that is an index of bulkiness can be obtained by dividing the basis weight by the thickness. The thickness of the nonwoven fabric is measured by observing the longitudinal section of the nonwoven fabric. First, the nonwoven fabric is cut into a size of 100 mm × 100 mm, and a measurement piece is collected. A plate of 12.5 g (diameter 56.4 mm) is placed on the measurement piece, and a load of 49 Pa is applied. Under this state, the longitudinal section of the nonwoven fabric is observed with a microscope (manufactured by Keyence Corporation, VHX-900), and the thickness is measured.

  In the nonwoven fabric used in the absorbent article of the present invention, the intersection of the heat-extensible fibers, the intersection of the heat-fusible conjugate fibers, and the intersection of the heat-extensible fibers and the heat-fusible conjugate fibers are air-through systems, respectively. It is heat-sealed. The three-dimensional network of constituent fibers is reliably maintained by this heat fusion, and the nonwoven fabric used in the absorbent article of the present invention is bulky, but it is difficult to reduce the thickness when a compressive force is applied in the thickness direction. Whether or not the intersection of the fibers is thermally fused by the air-through method can be determined by observing the nonwoven fabric with a scanning electron microscope.

  The nonwoven fabric used in the absorbent article of the present invention has one of the characteristics in the fiber diameter relationship between the heat-extensible fiber and the heat-fusible composite fiber. Specifically, the fiber diameter of the heat-extensible fiber is larger than the fiber diameter of the heat-fusible conjugate fiber. Thereby, the rough feeling of the surface of a nonwoven fabric reduces, and the touch of a nonwoven fabric becomes favorable. In general, the roughness of the surface of the nonwoven fabric depends on the thickness of the constituent fibers, and the roughness becomes more pronounced as the thickness increases. By the way, as a result of the study by the present inventors, when compared with the same thickness, a heat-extensible fiber made from a heat-extensible fiber is a heat-fusible conjugate fiber made from a heat-fusible conjugate fiber. It was found that it was difficult to perceive a rough feeling. In other words, when compared with the same thickness, the heat-fusible conjugate fiber is more susceptible to a rough feeling than the heat-extensible fiber. Therefore, in the present invention, the fiber diameter of the heat-extensible fiber is made larger than the fiber diameter of the heat-fusible composite fiber. The reason why it is difficult to perceive the feeling of roughness in heat-extensible fibers is that heat-extensible fibers made from heat-extensible fibers have a lower elastic modulus than heat-fusible composite fibers made from heat-fusible fibers. The present inventors speculate that this may be due to the above. In the non-woven fabric used in the absorbent article of the present invention, the heat-extensible fibers are composed of heat-extensible fibers after heat extension, and the fiber diameter of the heat-extensible fibers referred to here is: It refers to the fiber diameter of the heat-extensible fiber after being stretched by heating. In general, when the heat-extensible fiber is stretched by heating, the fiber diameter becomes small.

  The nonwoven fabric used in the absorbent article of the present invention may contain fibers other than the above-described heat-extensible fibers and heat-fusible composite fibers. Examples of such fibers include fibers that are not inherently heat-fusible (for example, natural fibers such as cotton and pulp, rayon and acetate fibers), acrylic fibers, and the like. For example, in the case of cotton, these fibers are contained in the nonwoven fabric for the purpose of imparting the nonwoven fabric with properties such as hygroscopicity.

  In the non-woven fabric used in the absorbent article of the present invention, the form of the non-woven fabric is maintained because the intersection of the constituent fibers is heat-sealed by the air-through method. May be further employed to maintain the form of the nonwoven fabric. Such means includes hot embossing. According to hot embossing, the constituent fibers of the nonwoven fabric are consolidated by consolidation with heat. The thickness of the embossed part formed in the nonwoven fabric by this consolidation is reduced compared to other parts of the nonwoven fabric. The embossed portion has, for example, a circular shape or a rectangular shape, and can be formed in a dotted shape over the entire area of the nonwoven fabric. Alternatively, a plurality of straight or curved embossed portions can be formed. A plurality of linear or curved embossed portions may be formed so as to cross each other.

  Next, the suitable manufacturing method of the nonwoven fabric used with the absorbent article of this invention is demonstrated, referring FIG. First, the card web 10 is produced using the card machine 9. The card web 10 includes a heat-extensible conjugate fiber and a heat-fusible conjugate fiber in a state before elongation.

  The web 10 is sent to a hot embossing device 11 where it is hot embossed. The hot embossing device 11 includes a pair of rolls 14 and 15. The roll 14 is a concavo-convex roll (engraved roll) having a concavo-convex processed peripheral surface. On the other hand, the roll 15 is a smooth roll (anvil roll) having a smooth peripheral surface. Each roll 14 and 15 is heated to a predetermined temperature.

  The hot embossing is preferably performed at a temperature that is equal to or higher than the melting point of the second resin component at −20 ° C. and lower than the melting point of the first resin component in the heat-extensible conjugate fiber in the web 10. Further, the heat embossing is preferably performed at a temperature of the melting point of the low-melting component in the heat-fusible conjugate fiber in the web 10 that is −20 ° C. or higher and lower than the melting point of the high-melting component. Furthermore, it is preferable that the heat embossing is performed at a temperature lower than the temperature at which the heat stretchable conjugate fiber exhibits heat stretch. When the melting points of the second component of the heat-extensible conjugate fiber and the heat-fusible conjugate fiber are different, the temperature range is set to the lower melting point. The heat-extensible conjugate fiber and the heat-fusible conjugate fiber in the web 10 are joined by hot embossing. As a result, a large number of embossed portions are formed on the web 10 to form the heat bond nonwoven fabric 14. In the embossed portion of the heat bond nonwoven fabric 14, the heat-extensible conjugate fiber and the heat-fusible conjugate fiber are consolidated and joined. In the part other than the embossed part, the heat-extensible conjugate fiber and the heat-fusible conjugate fiber are both in a non-bonded free state. Further, the elongation of the heat-extensible composite fiber has not yet occurred.

  Next, the heat bond nonwoven fabric 14 is conveyed to the air-through device 15. In the air-through device 15, an air-through process is performed on the heat bond nonwoven fabric 14. That is, the air through device 15 is configured such that hot air heated to a predetermined temperature penetrates the heat bond nonwoven fabric 14. The air-through process is performed at a temperature at which the heat-extensible conjugate fiber in the heat bond nonwoven fabric 14 is elongated by heating. And the intersection of the heat-extensible composite fibers in the free state existing in the portion other than the embossed portion in the heat bond nonwoven fabric 14, the intersection of the heat-fusible conjugate fibers, and the heat-extensible conjugate fiber and the heat-fusible conjugate fiber It is performed at a temperature at which the intersection with the heat seals. However, the temperature needs to be set to a temperature lower than the melting point of the first resin component of the heat-extensible conjugate fiber and the high melting point component of the heat-fusible conjugate fiber.

  By such an air-through process, the heat-extensible composite fiber existing in a portion other than the embossed portion is elongated. Since a part of the heat-extensible fiber is fixed by the embossed portion, the stretched portion is a portion between the embossed portions. And since the part of the thermally stretchable fiber is fixed by the embossed portion, the stretched portion of the stretched thermally stretchable composite fiber loses its place in the plane direction of the heat bond nonwoven fabric 14, and the nonwoven fabric 16 Move in the thickness direction. Along with this movement, the heat-fusible conjugate fiber entangled with the heat-extensible fiber also moves in the thickness direction. These actions increase the bulk. Further, by air-through processing, the intersections of the heat-extensible conjugate fibers, the intersections of the heat-fusible conjugate fibers, and the intersections of the heat-extensible conjugate fibers and the heat-fusible conjugate fibers are respectively heat-melted at the convex portion of the nonwoven fabric 16 Join by wearing. Thus, the target nonwoven fabric 8 is obtained.

  In the above manufacturing method, in order to set the blending ratio of the constituent fibers of the nonwoven fabric 8 within the above-described range, for example, the following operation may be performed in the manufacture of the card web 10 that is a raw material of the nonwoven fabric 8.

  FIG. 3 schematically shows the structure of the card machine 9 for manufacturing the card web 10. The carding machine 9 has a cylindrical member called a main cylinder 30 disposed at the center thereof. The main cylinder 30 is rotatable around its axis. In the figure, the main cylinder 30 rotates in the direction indicated by the arrow. A large number of comb teeth (not shown) are erected on the peripheral surface of the main cylinder 30. The direction in which the comb teeth extend coincides with the radial direction of the main cylinder 30. The main cylinder 30 is used for temporarily loosening (opening) and aligning the lump-like fiber mixture 12 ′ by the action of comb teeth provided on the peripheral surface thereof.

  A cylindrical member called a feed 31 and a breast 32 is arranged on the upstream side of the main cylinder 30. The feed 31 and breast 32 are rotating in the direction indicated by the arrow in FIG. The feed 31 and the breast 32 have a function of feeding the mixture 12 ′ of the heat-extensible fiber and the heat-fusible composite fiber to the main cylinder 30.

  The card machine 9 further includes a striper 33 and a worker 24. The striper 33 and the worker 24 are both cylindrical members, and are disposed at positions facing the peripheral surface of the main cylinder 30. Further, the stripper 33 and the worker 24 are arranged along the peripheral surface of the main cylinder 30 so that the worker 24 is located on the downstream side of the rotation with respect to the stripper 33. A plurality of sets of strippers 33 and workers 24 may be arranged.

  The stripper 33 and the worker 24 have a large number of comb teeth (not shown) erected on the peripheral surfaces thereof. The extending direction of the comb teeth coincides with the radial direction of the striper 33 and the worker 24. The fiber mixture 12 ′ supplied to the card machine 9 is uniformly arranged by the worker 24 and the stripper 23 on the main cylinder 30. The worker 24 functions to remove excess fibers located on the main cylinder 30 and return the stripper 23 to the main cylinder 30.

  The fiber mixture 12 ′ coming out of the main cylinder 30 is delivered to the doffer 35. The doffer 35 is a cylindrical member, and is disposed so that the peripheral surface thereof faces the peripheral surface of the main cylinder 30. The doffer 35 is used to deliver the fiber mixture 12 ′ coming out of the main cylinder 30 to the condensation 36 located downstream of the doffer 35.

  A condensation 36 made of a cylindrical member is disposed downstream of the doffer 35. The condensation 36 is arranged so that its peripheral surface faces the peripheral surface of the doffer 35. The condensation 36 is used to deliver the card web 10 to a subsequent process while adjusting the alignment of the fibers in the fiber mixture 12 ′ received from the doffer 35 and forming the card web 10.

  The method for producing an absorbent article of the present invention is characterized in that the peripheral speed of the doffer 35 with respect to the peripheral speed of the condensation 36 is made faster than the conventional operating conditions. By setting such conditions, the amount of the fiber mixture 12 ′ supplied from the doffer 35 to the condensation 36 becomes larger than before, and the fibers are packed in the condensation 36. As a result, the proportion of fibers oriented in the width direction is relatively high compared to fibers oriented in the machine direction. From the viewpoint of making this effect more prominent, the ratio of the peripheral speed of the condensation 36 to the peripheral speed of the doffer 35 (peripheral speed of the condensation 36 when the peripheral speed of the doffer 35 is 100) is 45% or less, particularly 20 It is preferable to set it to ˜45%.

  Furthermore, in the method for producing an absorbent article of the present invention, the ratio of the speed at which the card web 10 is fed into the air through device 15 to the speed at which the card web 10 is fed out from the heat embossing device 11 (the web 10 introduced into the air through device 15 It is also preferable that the speed of the web 10 delivered from the hot embossing device 11 when the speed is 100 is set to 90 to 100%, particularly 95 to 100%. This speed ratio is larger than the manufacturing conditions for the conventional air-through nonwoven fabric. By increasing the speed ratio, the tension applied to the card web 10 can be reduced. As a result, fibers can be prevented from being oriented in the machine direction in the card web 10. In the present invention, the card web may be made by a single card machine, or may be made by connecting a plurality of card machines. In the latter case, a part of the card web to be stacked may not be made by the method of the present invention.

  A heat embossing device 11 is installed between the card machine 9 and the air through device 15. In this heat embossing device 11, the heating temperature of the smooth roll 13 is set lower than the heating temperature of the uneven roll 12. It is preferable. Such a condition setting can also prevent the fibers from being oriented in the machine direction in the card web 10. The reason is as follows. The smooth roll 13 has a larger contact area with the card web 10 than the uneven roll 12. Therefore, if the smooth roll 13 and the uneven | corrugated roll 12 are set to the same heating temperature, it will become easy to stick the card web 10 of the smooth roll 13 which is a roll with a large contact area. Since the sticking of the card web 10 to the smooth roll 13 hinders the production of the nonwoven fabric 8, conventionally, the card web 10 is sent out from the hot embossing device 11 in order to prevent this sticking from occurring. The ratio of the introduction speed into the air-through device 15 with respect to the speed was increased, and the card web 10 was forcibly removed from the smooth roll 13. However, such an operation contributes to the orientation of the fibers in the card web 10 in the machine direction and should be avoided in the present invention. Therefore, in the method for producing the absorbent article of the present invention, the card web 10 is prevented from sticking to the smooth roll 13 by setting the heating temperature of the smooth roll 13 lower than the heating temperature of the uneven roll 12. doing. In addition, as described above, by reducing the ratio of the introduction speed to the air-through device 15 with respect to the speed at which the card web 10 is sent out from the card machine 9, it is possible to prevent excessive tension from being applied to the card web. The fibers in 10 are not oriented in the machine direction.

  From the above viewpoint, the heating temperature of the smooth roll 13 is preferably set to be 5 to 25 degrees lower than the heating temperature of the uneven roll 12, and more preferably set to be 10 to 20 degrees lower.

  The nonwoven fabric 8 obtained in this way can be applied to various fields that make use of its uneven shape, bulkiness and high strength. For example, surface sheets in the field of disposable hygiene articles such as disposable diapers and sanitary napkins, second sheets (sheets disposed between the surface sheet and the absorber), back sheets, leak-proof sheets, or personal wipes, It is suitably used as a skin care sheet, and further as an objective wiper.

  Next, the heat-extensible fiber and the heat-fusible conjugate fiber, which are raw materials for the heat-extensible fiber and the heat-fusible conjugate fiber, will be described. Examples of the heat-extensible fiber, which is a raw material for the heat-extensible fiber, include a fiber that expands by changing the crystal state of the resin by heating. Particularly preferably used heat-extensible fibers include a first resin component and a second resin component having a melting point or softening point lower than the melting point of the first resin component, and the second resin component forms at least a part of the fiber surface. It is a composite fiber that exists continuously in the length direction (hereinafter, this fiber is referred to as “heat-extensible composite fiber”). The 1st resin component in a heat | fever extensible composite fiber is a component which expresses the heat | fever extensibility of this fiber, and a 2nd resin component is a component which expresses heat-fusibility. The heat stretchable conjugate fiber is stretched by heating to a temperature lower than the melting point of the first resin component. In producing the nonwoven fabric used in the absorbent article of the present invention, the heat-extensible conjugate fiber is stretched by performing a heat treatment at a temperature equal to or higher than the melting point of the second resin component and lower than the melting point of the first resin component. A heat extensible fiber is produced.

  The first resin component and the second resin component in the heat-extensible composite fiber preferably have a specific value for their orientation index from the viewpoint of sufficient heat-extensible expression. The orientation index of the resin is naturally different depending on the resin to be used. For example, when a polypropylene resin is used as the first resin component, the orientation index is preferably 60% or less, particularly 40% or less, and more preferably 25% or less. When the first resin component is polyester, the orientation index is preferably 25% or less, particularly 20% or less, and more preferably 10% or less. On the other hand, the second resin component preferably has an orientation index of 5% or more, particularly 15% or more, and more preferably 30% or more. The orientation index is an index of the degree of orientation of the polymer chain of the resin constituting the fiber. And when the orientation index of a 1st resin component and a 2nd resin component is each said value, a heat | fever extensible composite fiber comes to expand | extend by heating.

The orientation index of the first resin component and the second resin component is expressed by the following formula (1), where A is the birefringence value of the resin in the heat-extensible conjugate fiber, and B is the intrinsic birefringence value of the resin. expressed.
Orientation index (%) = A / B × 100 (1)

  Intrinsic birefringence refers to birefringence in the state where the polymer polymer chains are perfectly oriented. The values are, for example, the first edition of “Plastic Materials in Molding”, and the typical plastic materials used in molding processes (plastics). Edited by the Japan Society for Molding and Processing, Sigma Publishing, published on February 10, 1998).

The birefringence in the heat-extensible composite fiber is measured under polarization in a direction parallel to and perpendicular to the fiber axis by attaching a polarizing plate to an interference microscope. As the immersion liquid, a standard refraction liquid manufactured by Cargille is used. The refractive index of the immersion liquid is measured with an Abbe refractometer. From the interference fringe image of the composite fiber obtained by the interference microscope, the refractive index in the direction parallel and perpendicular to the fiber axis is obtained by the calculation method described in the following document, and the birefringence that is the difference between the two is calculated.
“Fiber structure formation in high-speed spinning of core-sheath type composite fiber”, page 408 (Journal of the Fiber Society, Vol. 51, No. 9, 1995)

  The heat stretchable conjugate fiber can be stretched by heat at a temperature lower than the melting point of the first resin component. The heat-extensible conjugate fiber has a temperature of 10 to 20 ° C. higher than the melting point of the second resin component, and in the case of a resin having no melting point, the thermal elongation rate at a temperature 10 ° C. higher than the softening point is 0.5 to 20%, particularly It is preferably 3 to 20%, particularly 5.0 to 20%. When a nonwoven fabric is produced using fibers having such a thermal elongation rate as a raw material, the nonwoven fabric becomes bulky due to the elongation of the fibers.

  The melting points of the first resin component and the second resin component are measured using a differential scanning calorimeter (DSC6200 manufactured by Seiko Instruments Inc.). A finely cut fiber sample (sample weight 2 mg) is subjected to thermal analysis at a heating rate of 10 ° C./min, and the melting peak temperature of each resin is measured. The melting point is defined by its melting peak temperature. When the melting point of the second resin component cannot be clearly measured by this method, this resin is defined as “resin having no melting point”. In this case, the temperature at which the second resin component is fused to such an extent that the fusion point strength of the fiber can be measured is defined as the temperature at which the molecular flow of the second resin component begins.

The thermal elongation rate of the fiber is measured by the following method. A thermomechanical analyzer TMA / SS6000 manufactured by Seiko Instruments Inc. is used. As a sample, after preparing a plurality of fibers having a fiber length of 10 mm or more so that the total weight per 10 mm of the fiber length is 0.5 mg, and arranging the plurality of fibers in parallel, Mount on the device with 10mm distance between chucks. The measurement start temperature is 25 ° C., and the temperature is increased at a temperature increase rate of 5 ° C./min with a constant load of 0.73 mN / dtex applied. The elongation amount of the fiber at that time is measured, and in the case of a resin having no melting point at a temperature 10 ° C. higher than the melting point of the second resin component, the elongation amount at a temperature 10 ° C. higher than the softening point is read. When the amount of elongation is Xmm, the thermal elongation rate is expressed by the following equation.
(X / 10) x 100 (%)
The reason why the thermal elongation rate is measured at the above-mentioned temperature is, as will be described later, when the nonwoven fabric is produced by thermally fusing the intersections of the fibers, and is higher than the melting point or softening point of the second resin component. It is because it is normal to manufacture in the range up to about 10 degreeC high temperature.

  In order for the heat-extensible composite fiber to achieve the above-described heat elongation rate, for example, a first resin component and a second resin component having different melting points are used, and melt spinning is performed at a low speed of less than 2000 m / min. After obtaining the fiber, the composite fiber may be heat-treated and / or crimped. In addition to this, the stretching process may be avoided.

  As the crimping process, it is convenient to perform mechanical crimping. There are two-dimensional and three-dimensional forms of mechanical crimping. In addition, there are three-dimensional manifested crimps found in the eccentric type core-sheath type composite fiber and side-by-side type composite fiber. Any aspect of crimping may be performed in the present invention. The crimping process may be accompanied by heating. Moreover, you may heat-process after a crimping process. Furthermore, in addition to the heat treatment after the crimping treatment, a separate heat treatment may be performed before the crimping treatment. Or you may perform a heat processing separately, without performing a crimping process.

  In the crimping process, the fiber may be somewhat stretched, but such stretching is not included in the stretching process referred to in the present invention. The drawing treatment referred to in the present invention refers to a drawing operation with a draw ratio of 2 to 6 times that is usually performed on undrawn yarn.

  Appropriate conditions for the heat treatment are selected according to the types of the first and second resin components constituting the composite fiber. The heating temperature is lower than the melting point of the second resin component. For example, when the heat-extensible conjugate fiber is a core-sheath type, the core component is polypropylene or polyester, and the sheath component is high-density polyethylene, the heating temperature is preferably 50 to 120 ° C., particularly preferably 70 to 115 ° C. The time is preferably 10 to 1800 seconds, particularly 20 to 1200 seconds. Examples of the heating method include hot air blowing and infrared irradiation. As described above, this heat treatment can be performed after the crimping treatment.

  There is no restriction | limiting in particular in the kind of 1st resin component and 2nd resin component, What is necessary is just resin with fiber formation ability. In particular, when the difference between the melting points of the two resin components, or the difference between the melting point of the first resin component and the softening point of the second resin component is 20 ° C. or more, particularly 25 ° C. or more, the production of the nonwoven fabric 8 by thermal fusion is performed. It is preferable because it can be easily performed. When the heat-extensible conjugate fiber is a core-sheath type, a resin having a melting point of the core component higher than the melting point or softening point of the sheath component is used. In particular, it is preferable to use a core-sheath type thermally stretchable conjugate fiber having a polyester such as polypropylene (PP) or polyethylene terephthalate (PET) as a core and a resin having a lower melting point than these as a sheath. As a preferable combination of the first resin component and the second resin component, as the second resin component when the first resin component is PP, the high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear Examples thereof include polyethylene such as low density polyethylene (LLDPE), ethylene propylene copolymer, and polystyrene. In addition, when a polyester resin such as PET or polybutylene terephthalate (PBT) is used as the first resin component, in addition to the example of the second resin component described above, PP, copolymer polyester, etc. may be used as the second resin component. Can be mentioned. Furthermore, examples of the first resin component include polyamide-based polymers and two or more types of copolymers of the first resin component described above, and examples of the second resin component include two or more types of the second resin component described above. Copolymers are also included. These are appropriately combined.

  The ratio (mass ratio) of the first resin component and the second resin component in the heat-extensible composite fiber is 10:90 to 90: 10%, particularly 20:80 to 80: 20%, especially 50:50 to 70:30. % Is preferred. Within this range, the mechanical properties of the fiber are sufficient, and the fiber can withstand practical use. Further, the amount of the fusion component is sufficient, and the fibers are sufficiently fused. Moreover, it is preferable that the ratio of the 1st resin component used as a core is large from a viewpoint of making the card | curd permeability favorable when it uses as a raw material of the nonwoven fabric manufactured with a card machine, without impairing extensibility.

  As the heat-extensible fiber, in addition to the above-described heat-extensible composite fiber, Japanese Patent No. 4131852, Japanese Patent Laid-Open No. 2005-350836, Japanese Patent Laid-Open No. 2007-303035, Japanese Patent Laid-Open No. 2007-204899, Japanese Patent The fibers described in 2007-204901 and JP-A-2007-204902 can also be used.

  The non-heat-extensible heat-fusible composite fiber used as a raw material together with the heat-extensible fiber includes two components having different melting points and is subjected to a drawing treatment. The heat-fusible conjugate fiber does not substantially extend its length even when heat is applied. The heat-fusible conjugate fiber is a bicomponent conjugate fiber that includes a high-melting-point component and a low-melting-point component, and the low-melting-point component continuously exists in the length direction at least part of the fiber surface. There are various forms of the composite fiber such as a core-sheath type and a side-by-side type, and any form can be used. The heat-fusible conjugate fiber is stretched at the raw material stage (that is, before being used for the nonwoven fabric). The stretching treatment referred to here is a stretching operation at a stretching ratio of about 2 to 6 times as described above.

  The fusing temperature of the heat-fusible composite fiber is preferably close to the fusing temperature of the heat-extensible fiber. Thereby, the heat-extensible fibers, the heat-fusible conjugate fibers, and the heat-extensible fibers and the heat-fusible conjugate fibers can be successfully fused. From this viewpoint, when the fusion temperature of the heat-fusible conjugate fiber is T1, and the fusion temperature of the heat-extensible fiber is T2, the difference between T1 and T2 is preferably within 20 ° C. Since it is not easy to strictly measure the fiber fusion temperature, the melting temperature of the resin involved in the fusion (that is, the low melting point resin) is replaced with the fusion temperature. The method for measuring the melting point uses the method described above.

  From the viewpoint of successfully fusing the heat-extensible fiber and the heat-fusible composite fiber, the low melting point component in the heat-fusible fiber and the second resin component in the heat-extensible composite fiber are the same type of resin. In the case of being different or different, it is preferable to have compatibility.

  In the heat-fusible conjugate fiber, the mass ratio of the high melting point component / low melting point component is preferably 6/4 to 2/8, particularly preferably 5/5 to 3/7. That is, it is preferable to contain a large amount of low melting point components. As a result, heat fusion by the air-through method occurs surely. This mass ratio can be calculated from the cross-sectional area of each of the high melting point component and the low melting point component and the density of each of the high melting point component and the low melting point component measured by observing the cross section of the heat-fusible conjugate fiber. As another means for surely causing the thermal fusion by the air-through method, it is possible to use one having a melt index of the low melting point component in the heat-fusible conjugate fiber of 10 to 40 g / 10 min, particularly 10 to 25 g / 10 min. preferable. The melt index is measured according to JIS K7210 under conditions of 190 ° C. and a load of 2.16 kg.

  As the resin of the heat-fusible composite fiber suitably used in relation to the above-described heat-extensible composite fiber, polypropylene or polyethylene terephthalate is used as a high melting point component, high density polyethylene (HDPE) as a low melting point component, and low density Examples thereof include combinations using polyethylene such as polyethylene (LDPE) and linear low density polyethylene (LLDPE), ethylene propylene copolymer, polystyrene, polypropylene, and copolyester.

  Both of the heat-extensible fiber and the heat-fusible composite fiber preferably have a fiber length of about 30 to 70 mm from the viewpoint of improving the passability of the card machine.

  The present invention is not limited to the above-described preferred embodiments. For example, in the manufacturing method described above, the card web 10 is subjected to hot embossing to manufacture a heat bond nonwoven fabric 14, and the air bond processing is performed on the heat bond nonwoven fabric 14. However, instead of this, the card web 10 may be directly subjected to air-through processing without performing hot embossing.

  The nonwoven fabric used in the absorbent article of the present invention is not limited to a single-layer structure including a heat-extensible fiber and a heat-fusible conjugate fiber, and a fiber layer containing the heat-extensible fiber and the heat-fusible conjugate fiber. And the nonwoven fabric of the multilayer structure which consists of a laminated structure with 1 or 2 or more other fiber layers containing another fiber may be sufficient. Further, it may be a composite nonwoven fabric obtained by laminating and integrating other nonwoven fabrics with a single layer nonwoven fabric including heat-extensible fibers and heat-fusible composite fibers.

<Method for producing absorbent article>
Hereinafter, the manufacturing method of the absorbent article 1 will be described with reference to a sanitary napkin as an example of the manufacturing method of the absorbent article of the present invention. A manufacturing apparatus 100 shown in FIG. 4 is used.

  On the peripheral surface of the suction drum 120 rotating in the machine direction MD, recesses 124 are formed at a required pitch in the circumferential direction as a mold for filling the absorbent material 122. When the suction drum 120 rotates and the recess 124 enters the material supply unit 121, the suction unit 126 acts on the recess 124, and the absorbent material 122 supplied from the material supply unit 121 is vacuum sucked into the recess 124. The material supply unit 121 is formed so as to cover the suction drum 120, and the material supply unit 121 supplies the absorber material 122 to the recess 124 by air conveyance, and the absorber 3 is formed in the recess 124. The The absorber 3 formed in the recess 124 is transferred onto the carrier sheet 110 that proceeds in the machine direction MD.

  The top sheet 2 composed of the non-woven fabric produced as described above is supplied from the roll 210 and laminated on the absorbent body 3 to form a laminated body 262. The laminated body 262 is embossed to form an embossed portion 6 ′ on the top sheet 2 and the absorbent body 3. This embossing is performed, for example, by laminating between an uneven (not shown) roll in which an annular protrusion corresponding to the embossed portion 6 ′ is formed on the peripheral surface and a receiving roll made of an elastic body whose peripheral surface is smooth. This is done by inserting the body 262. Specifically, the embossed portion 6 ′ is formed in the laminate 262 by passing between the upper roll 131 and the lower roll 132 of the embossing apparatus 130.

  Next, an adhesive is applied from the adhesive applicator to the backsheet 141 unwound from the backsheet roll 140, and the backsheet 141 and the laminate 262 are laminated to form a laminate 263. Next, the laminate 263 is round-embossed into the shape of the absorbent article with an embossing roll 261 (not shown), and cut into the shape of the absorbent article 1 (sanitary napkin) using the cutter 150.

  The blood slipperiness | lubricity imparting agent 161 is apply | coated to the center area | region of the absorbent article 1 (sanitary napkin) using the application spray 160 of the blood slipperiness | lubricity imparting agent 161 or the blood slipperiness | lubricity imparting agent composition 161, and a top sheet A blood slipperiness-imparting agent layer is formed on the side surface of the skin. From the above, the absorbent article 1 (sanitary napkin) can be manufactured.

  It is preferable that the blood slipperiness imparting agent layer is formed at least in the excretion opening contact area in the excreta supply area of the top sheet 2.

  In the method for manufacturing an absorbent article according to the present invention, the blood slipperiness imparting agent is applied after cutting out the absorbent article 1 (sanitary napkin), but it may be applied at any stage before cutting out. You may apply | coat in the manufacturing process of the sheet | seat 2. FIG. In order to prevent the blood slipperiness-imparting agent applied during manufacture from flowing down, the blood slipperiness-imparting agent is applied immediately downstream of the manufacturing process, for example, immediately before the absorbent article 1 (sanitary napkin) is packaged. It is preferable.

  The method for applying the blood slipperiness imparting agent 161 or the blood slipperiness imparting agent composition 161 or the coating liquid containing the same is not particularly limited, and the blood slipperiness imparting agent 161 or the blood slipperiness is applied as necessary. The property-imparting agent composition 161 or a coating solution containing the same is heated and, for example, a non-contact type coater such as a spiral coater, curtain coater, spray coater, dip coater or the like is used. Then, the blood slipperiness imparting agent 161 or the blood slipperiness imparting agent composition 161 or a coating solution containing the same can be applied. As the coating device, a non-contact type coater is preferable from the viewpoint that the droplet-like or particulate modifier is uniformly dispersed throughout and the point of not damaging the material.

  In addition, the blood slipperiness-imparting agent 161 or the blood slipperiness-enhancing agent composition 161, or the coating liquid containing the same is heated as it is when it is liquid at room temperature or is lowered to lower the viscosity, and is solid at room temperature. In some cases, it can be heated to liquefy and applied from a control seam HMA (Hot Melt Adhesive) gun. By increasing the air pressure of the control seam HMA gun, the fine blood slipperiness-imparting agent 161 or the blood slipperiness-imparting agent composition 161 can be applied. In addition, the coating amount of the blood modification imparting agent or the blood slipperiness imparting agent-containing composition can be adjusted, for example, by increasing or decreasing the coating amount from the control seam HMA gun.

  The blood slipperiness | lubricity imparting agent 161 or the blood slipperiness | lubricity imparting agent composition 161 can be applied as desired as a coating liquid containing a volatile solvent, for example, an alcohol solvent, an ester solvent, and an aromatic solvent. When the coating liquid contains a volatile solvent, the viscosity of the coating liquid containing the blood slipperiness-imparting agent 161 or the blood slipperiness-imparting agent composition 161 is lowered, so that the coating is easy. Simplification of the coating process, such as eliminating the need for a coating.

  As mentioned above, although demonstrated based on one embodiment of the manufacturing method of the absorbent article of this invention, this invention is not restrict | limited to the embodiment.

Hereinafter, although an example is given and the present invention is explained, the present invention is not limited to these examples.
[Test Example 1]
[Evaluation of rewetting rate and absorber transfer speed]
A commercially available sanitary napkin having a shape as shown in FIG. 1 (no blood slipping agent was applied) was prepared. The sanitary napkin includes a top sheet formed from an air-through nonwoven fabric (composite fiber made of polyester and polyethylene terephthalate, basis weight: 35 g / m ² ) treated with a hydrophilic agent, and an air-through nonwoven fabric (composite made of polyester and polyethylene terephthalate). Second sheet formed from fiber, basis weight: 30 g / m ² ), pulp (basis weight: 150 to 450 g / m ² , more in the center), acrylic superabsorbent polymer (basis weight: 15 g / m ² ) And an absorbent body containing a tissue as a core wrap, a side sheet treated with a water repellent, and a back sheet made of a polyethylene film.

The blood lubricity imparting agents used in the experiment are listed below.
[Ester of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid]
Unistar H-408BRS, manufactured by NOF Corporation Tetra-2-ethylhexanoate pentaerythritol, weight average molecular weight: about 640
Unistar H-2408BRS-22, manufactured by NOF Corporation Mixture of tetra-2-ethylhexanoic acid pentaerythritol and di-2-ethylhexanoic acid neopentyl glycol (58:42, mass ratio), weight average molecular weight: about 520

[Ester of (a ₂ ) chain hydrocarbon triol and at least one fatty acid]
· Cetiol SB45DEO, the Cognis Corp. fatty acids, oleic acid or stearic acid, triesters · SOY42 of glycerin and fatty acids, fatty acid manufactured by NOF Corporation C _14: fatty acid C _16: fatty acid C _18: Triester of glycerin and fatty acid, weight average molecular weight, containing C ₂₀ fatty acids (including both saturated and unsaturated fatty acids) in a mass ratio of approximately 0.2: 11: 88: 0.8 880

Tri-C2L oil fatty acid glyceride, manufactured by NOF Corporation C ₈ fatty acid: C ₁₀ fatty acid: C ₁₂ fatty acid is contained in a mass ratio of approximately 37: 7: 56, triester of glycerin and fatty acid, Weight average molecular weight: about 570
Tri-CL oil fatty acid glyceride, manufactured by NOF Corporation C ₈ fatty acid: C ₁₂ fatty acid is contained in a mass ratio of approximately 44:56, triester of glycerin and fatty acid, weight average molecular weight: about 570

· PANACET 810s, fatty acids manufactured by NOF Corporation C _8: fatty to C ₁₀ are contained in approximately 85:15 weight ratio of triesters of glycerol with fatty acids, the weight average molecular weight: about 480
・ Panasate 800, manufactured by NOF Corporation All fatty acids are octanoic acid (C ₈ ), triester of glycerin and fatty acid, weight average molecular weight: about 470

Panaceate 800B, manufactured by NOF Corporation All fatty acids are 2-ethylhexanoic acid (C ₈ ), triester of glycerin and fatty acid, weight average molecular weight: about 470
· NA36, manufactured by NOF Corporation C ₁₆ fatty acid: fatty acid C _18: (including both saturated and unsaturated fatty acids) C ₂₀ fatty acid approximately 5: contained at a weight ratio of 3: 92 Triester of glycerin and fatty acid, weight average molecular weight: about 880

· Tri-coconut oil fatty acid glyceride, NOF fatty Ltd. C _8: fatty C _10: fatty acid C _12: fatty acid C _14: (including both saturated and unsaturated fatty acids) fatty acids C ₁₆ is approximately 4 : Triester of glycerin and fatty acid, contained in a mass ratio of 8: 60: 25: 3, weight average molecular weight: 670
-Caprylic acid diglyceride, manufactured by NOF Corporation Fatty acid is octanoic acid, diester of glycerin and fatty acid, weight average molecular weight: 340

[Ester of (a ₃ ) chain hydrocarbon diol and at least one fatty acid]
Unistar H-208BRS, NOF Corporation di-2-ethylhexanoic acid neopentyl glycol, weight average molecular weight: about 360
-Compol BL, manufactured by NOF Corporation Butylene glycol dodecanoic acid (C ₁₂ ) monoester, weight average molecular weight: about 270
Compole BS, manufactured by NOF Corporation Butylene glycol octadecanoic acid (C ₁₈ ) monoester, weight average molecular weight: about 350

[(C ₂ ) Ester of linear hydrocarbon tricarboxylic acid having 3 carboxyl groups, hydroxy acid, alkoxy acid or oxo acid and at least one aliphatic monohydric alcohol]
・ Tributyl O-acetylcitrate, manufactured by Tokyo Chemical Industry Co., Ltd. Weight average molecular weight: about 400
Tributyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd. Weight average molecular weight: about 360

[(C ₃ ) ester of a chain hydrocarbon dicarboxylic acid having two carboxyl groups, a hydroxy acid, an alkoxy acid or an oxo acid and at least one aliphatic monohydric alcohol]
・ Dioctyl adipate, manufactured by Wako Pure Chemical Industries, Ltd. Weight average molecular weight: about 380

[(D ₃ ) ester of fatty acid and aliphatic monohydric alcohol]
Electol WE20, an ester of dodecanoic acid (C ₁₂ ) and dodecyl alcohol (C ₁₂ ) manufactured by NOF Corporation, weight average molecular weight: about 360
Electol WE40, an ester of tetradecanoic acid (C ₁₄ ) and dodecyl alcohol (C ₁₂ ) manufactured by NOF Corporation, weight average molecular weight: about 390

[(E ₁ ) polyoxy C ₃ -C ₆ alkylene glycol]
・ Uniol PB500, polybutylene glycol manufactured by NOF Corporation, weight average molecular weight: about 500
-Uniol PB700, manufactured by NOF Corporation polyoxybutylene polyoxypropylene glycol, weight average molecular weight: about 700

[(F ₁ ) chain alkane]
・ Pearl Ream 6, manufactured by NOF Corporation Branched hydrocarbons produced by copolymerizing liquid isoparaffin, isobutene and n-butene and then adding hydrogen, degree of polymerization: about 5 to about 10, weight average molecular weight : About 330

[Other materials]
-NA50, manufactured by NOF Corporation Hydrogen added to NA36 to reduce the ratio of double bonds derived from the unsaturated fatty acid as a raw material Triester of glycerin and fatty acid, weight average molecular weight: about 880
-(Caprylic acid / capric acid) monoglyceride, NOF Corporation octanoic acid (C ₈ ) and decanoic acid (C ₁₀ ) in a mass ratio of approximately 85:15, monoester of glycerin and fatty acid, Weight average molecular weight: about 220
-Monomuls 90-L2 lauric acid monoglyceride, manufactured by Cognis Japan

・ Isopropyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd. Weight average molecular weight: about 230
・ Diisostearyl malate Weight average molecular weight: about 640
・ Uniol PB1000R, polybutylene glycol manufactured by NOF Corporation, weight average molecular weight: about 1,000
・ Uniol D-250, manufactured by NOF Corporation, polypropylene glycol, weight average molecular weight: about 250

-Uniol D-400, manufactured by NOF Corporation, polypropylene glycol, weight average molecular weight: about 400
-Uniol D-700, NOF Corporation polypropylene glycol, weight average molecular weight: about 700
・ Uniol D-1000, manufactured by NOF Corporation, polypropylene glycol, weight average molecular weight: about 1,000
・ Uniol D-1200, manufactured by NOF Corporation, polypropylene glycol, weight average molecular weight: about 1,160

-Uniol D-2000, NOF Corporation polypropylene glycol, weight average molecular weight: about 2,030
-Uniol D-3000, NOF Corporation polypropylene glycol, weight average molecular weight: about 3,000
・ Uniol D-4000, manufactured by NOF Corporation, polypropylene glycol, weight average molecular weight: about 4,000

PEG 1500, manufactured by NOF Corporation, polyethylene glycol, weight average molecular weight: about 1,500 to about 1,600
-Wilbright cp9, manufactured by NOF Co., Ltd. A compound in which the OH groups at both ends of polybutylene glycol are esterified with hexadecanoic acid (C ₁₆ ), weight average molecular weight: about 1,150
Unilube MS-70K, NOF Corporation Polypropylene glycol stearyl ether, about 15 repeating units, weight average molecular weight: about 1,140

Nonionic S-6, manufactured by NOF Corporation, polyoxyethylene monostearate, about 7 repeating units, weight average molecular weight: about 880
・ Unilube 5TP-300KB
Polyoxyethylene polyoxypropylene pentaerythritol ether produced by adding 5 mol of ethylene oxide and 65 mol of propylene oxide to 1 mol of pentaerythritol, weight average molecular weight: 4,130

-Wilbright s753, NOF Corporation polyoxyethylene polyoxypropylene polyoxybutylene glycerin, weight average molecular weight: about 960
・ Uniol TG-330, manufactured by NOF Corporation Polypropylene glycol glyceryl ether, about 6 repeating units, weight average molecular weight: about 330

-Uniol TG-1000, manufactured by NOF Corporation Polyglycol glycol glyceryl ether, about 16 repeating units, weight average molecular weight: about 1,000
-Uniol TG-3000, manufactured by NOF Corporation Polyglycol glycol glyceryl ether, about 16 repeating units, weight average molecular weight: about 3,000
-Uniol TG-4000, manufactured by NOF Corporation Polyglycol glycol glyceryl ether, about 16 repeating units, weight average molecular weight: about 4,000

Unilube DGP-700, manufactured by NOF Corporation Polyglycol glycol diglyceryl ether, about 9 repeating units, weight average molecular weight: about 700
・ Uniox HC60, polyoxyethylene hydrogenated castor oil manufactured by NOF Corporation, weight average molecular weight: about 3,570
-Petrolatum, manufactured by Cognis Japan Co., Ltd. Petroleum-derived hydrocarbon, semi-solid Kinematic viscosity, moisture content, weight average molecular weight, IOB and melting point of the above sample are shown in Table 2 below.
Regarding the melting point, “<45” means that the melting point is less than 45 ° C.

The above-mentioned blood slipperiness imparting agent was applied to almost the entire skin contact surface of the top sheet of the sanitary napkin. Each blood slipperiness agent is heated as it is when the blood slipperiness agent is liquid at room temperature, and when the blood slipperiness agent is solid at room temperature, it is heated to a temperature of melting point + 20 ° C., then Each blood slipperiness imparting agent was atomized using a control seam HMA gun and applied to the skin contact surface of the top sheet so that the basis weight was approximately 5 g / m ² .

FIG. 5 is an electron micrograph of the skin contact surface of the top sheet in a sanitary napkin (No. 1-5) in which the top sheet contains tri-C2L oil fatty acid glycerides. As is apparent from FIG. 5 , the tri-C2L oil fatty acid glyceride is in the form of fine particles and is present on the surface of the fiber.

[Test method]
An acrylic plate with a hole (200 mm × 100 mm, 125 g, with a hole of 40 mm × 10 mm in the center) is placed on the top sheet containing each blood slipperiness-imparting agent, and 37 ± 1 from the hole. 3 g of equine EDTA blood at 0 ° C. (Ethylene diamine tetraacetic acid (hereinafter referred to as “EDTA”) was added dropwise to the equine blood using a pipette for the first time) Thereafter, 3 g of equine EDTA blood at 37 ± 1 ° C. was again dropped with a pipette from the hole in the acrylic plate (second time).

Immediately after the second drop of blood, remove the acrylic plate immediately and place 10 pieces of filter paper (Qualitative Filter Paper No. 2, 50 mm x 35 mm) at the place where the blood was dropped. A weight was placed so as to be / cm ² . After 1 minute, the filter paper was taken out, and the “rewetting rate” was calculated according to the following formula.
Rewetting rate (%) = 100 × (filter paper mass after test−initial filter paper mass) / 6

In addition to the evaluation of the rewet rate, “absorber transfer rate”, which is the time for blood to transfer from the top sheet to the absorber, was measured after the second drop of blood. The above-mentioned absorption body transfer speed means the time from when blood is introduced into the top sheet until the redness of blood is not seen on the surface and inside of the top sheet.
The results of the rewet rate and the absorber transfer speed are shown in Table 2 below.

Moreover, the whiteness of the skin contact surface of the top sheet (TS) after the test of the absorber transition speed was visually evaluated according to the following criteria.
A: Almost no red blood remains, and it is not possible to distinguish between a place where blood is present and a place where blood does not exist. ○: Although a little red blood remains, Difficult to distinguish where it does not exist △: Some red blood remains, can be seen where blood existed ×: Red blood remains

Furthermore, the tackiness of the skin contact surface of the top sheet was measured at 35 ° C. according to the following criteria.
○: No tackiness Δ: Some tackiness is present ×: There is tackiness The results are shown in Table 2 below.

  When there was no blood slipperiness-imparting agent, the rewet rate was 22.7% and the absorber transfer rate was more than 60 seconds, but the triesters of glycerin and fatty acid were both rewet rates. Is 7.0% or less, and the absorber transfer speed is 8 seconds or less, which indicates that the absorption performance is greatly improved.

Similarly, blood having a kinematic viscosity at 40 ° C. of about 0.01 to 80 mm ² / s, a water retention of about 0.01 to about 4.0% by weight, and a weight average molecular weight of less than about 1,000. It was found that the lubricity imparting agent greatly improved the absorption performance.

Next, no. When the sanitary napkins 1-1 to 51-51 were worn by a plurality of volunteer subjects, no. In the sanitary napkin containing the blood slipping agent of 1-1 to 1-23, even after absorption of menstrual blood, the top sheet is not sticky and the answer is that the top sheet is smooth. It was.
No. In the sanitary napkin containing the blood slipperiness imparting agents 1-11, 13, 16, 18-20 and 23, the skin contact surface of the top sheet after absorbing menstrual blood is not stained red with blood, The answer that there was little pleasure was obtained.

[Test Example 2]
[Remaining ratio of menstrual blood surface on top sheet having groove structure]
The surface residual rate of menstrual blood in the top sheet having a ridge groove structure was evaluated.
A top sheet formed from an air-through nonwoven fabric (composite fiber comprising polyester and polyethylene terephthalate, basis weight: 35 g / m ² ) treated with a hydrophilic agent, and an air-through nonwoven fabric (composite fiber comprising polyester and polyethylene terephthalate, basis weight: 30 g) / M ² ), pulp (basis weight: 150 to 450 g / m ² , more in the center), acrylic superabsorbent polymer (basis weight: 15 g / m ² ), and tissue as a core wrap. An absorbent body, a side sheet treated with a water repellent, and a back sheet made of a polyethylene film were prepared.

  The top sheet is a top sheet having a ridge groove structure manufactured according to the method described in Japanese Patent Application Laid-Open No. 2008-2034. The ridge portion has a thickness of about 1.5 mm and the groove portion has a thickness of about 0. 4 mm, the pitch of the ridge groove structure (width of the ridge portion + width of the groove portion) was about 4 mm, and an opening portion having an opening ratio of about 15% was formed in the groove portion.

Unistar H-408BRS (manufactured by NOF Corporation, tetraester of pentaerythritol and fatty acid) is selected as a blood slipperiness-imparting agent, and the skin contact surface (畝) of the top sheet from a control seam HMA gun at room temperature. The groove surface was applied at a basis weight of 5.0 g / m ² . When confirmed with an electron microscope, H-408BRS was in the form of fine particles and adhered to the fiber surface.
Next, the back sheet, the absorbent body, the second sheet, and the top sheet were sequentially laminated with the groove surface facing up, whereby a sanitary napkin no. 2-1.

The blood slipperiness-imparting agent was changed from Unistar H-408BRS to that shown in Table 3 below. 2-2 to No. 2 2-40 was produced. When the blood slipperiness-imparting agent is liquid at room temperature, and when the blood slipperiness-imparting agent is solid at room temperature, it is heated to a temperature of melting point + 20 ° C., and then the control seam HMA gun The blood slipperiness-imparting agent was atomized and applied to the skin contact surface of the top sheet so that the basis weight was approximately 5 g / m ² .
Moreover, the blood slipperiness | lubricity imparting agent was apply | coated to the whole skin contact surface of the top sheet, and both the heel part and the groove part.

[Test method]
After measuring the mass of the top sheet: W ₂ (g) (the mass of the top sheet before the test), an acrylic plate having a hole in the center in the longitudinal direction and the width direction of the absorbent article and on the top sheet ( Place 200mm x 100mm, 125g, 40mm x 10mm hole in the center, and from the hole, 37 ± 1 ° C equine EDTA blood (ethylenediaminetetraacetic acid (hereinafter referred to as equine blood to prevent coagulation) 4.0 g) was added dropwise with a pipette.

Immediately after dropping the equine EDTA blood, the above acrylic plate is removed, the top sheet is taken out, its mass W ₃ (the mass of the top sheet after the test) is measured, and “surface residual ratio (mass%)” according to the following formula: Was calculated.
Surface residual rate (mass%)
= 100 × [W ₃ (g) −W ₂ (g)] / 4.0 (g),
The results are shown in Table 3 below.

  A sanitary napkin No. having no blood slipperiness imparting agent. In No. 2-40, the surface residual rate was 7.5% by mass, but the kinematic viscosity and water retention rate were within the predetermined ranges. 2-1. In 2-16, the surface residual rate was 2.5 mass% or less.

Sanitary napkin no. 2-1. In 2-16, it was observed that the equine EDTA blood dripped onto the buttocks of the top sheet slid down from the buttocks to the groove and quickly absorbed into the absorber from the groove. On the other hand, in the sanitary napkin No. 2-40 having no blood slipperiness imparting agent, the dropped equine EDTA blood does not slide down into the groove part, but slowly drops down into the groove part, most of which is the top sheet buttock Remained. Further, in an absorbent article having a high water retention rate, for example, No. 2-25, the equine EDTA blood dripped onto the buttocks of the top sheet does not slide down into the groove part but remains partially in the top sheet. Slowly dropped and some remained in the buttocks.
In order to confirm the action of the blood slipping agent, the following experiment was further conducted.

[Test Example 3]
[Viscosity of blood containing blood slipping agent]
The viscosity of blood containing a blood slipping agent was measured using Rheometric Expansion System ARES (Rheometric Scientific, Inc). 2% by mass of panacet 810s was added to equine defibrinated blood, lightly stirred to form a sample, the sample was placed on a parallel plate with a diameter of 50 mm, the gap was 100 μm, and the viscosity was measured at 37 ± 0.5 ° C. . Because of the parallel plate, the sample did not have a uniform shear rate, but the average shear rate displayed on the instrument was 10 s ⁻¹ .

  The viscosity of equine defibrinated blood containing 2% by mass of panacet 810s was 5.9 mPa · s, while the viscosity of equine defibrinated blood containing no blood slipperiness agent was 50.4 mPa · s. Therefore, it can be seen that equine defibrinated blood containing 2% by mass of panacet 810s decreases the viscosity by about 90% compared to the case where no blood slipperiness-imparting agent is contained.

  It is known that blood contains components such as blood cells and has thixotropic properties, but the blood slipperiness imparting agent of the present invention has an action of lowering the viscosity of blood such as menstrual blood in a low viscosity range. It is thought to have. By reducing the viscosity of blood, it is considered that absorbed menstrual blood is easily transferred from the top sheet to the absorber.

[Test Example 4]
[Micrograph of blood containing blood slipping agent]
A healthy volunteer's menstrual blood was collected on a food protective wrap film, and a portion of the panacet 810s dispersed in 10 times the mass of phosphate buffered saline was used, and the concentration of panacet 810s was 1% by mass. It added so that it might become. Menstrual blood was appropriately applied to a slide glass, covered with a cover glass, and the state of red blood cells was observed with an optical microscope. A micrograph of menstrual blood containing no blood slipping agent is shown in FIG. 6 (a), and a micrograph of menstrual blood containing panacet 810s is shown in FIG. 6 (b).

  From FIG. 6, in menstrual blood that does not contain a blood slipperiness-imparting agent, red blood cells form aggregates such as remuneration, but in menstrual blood that includes panacet 810s, red blood cells are each stably dispersed. I understand that. Therefore, it is suggested that the blood slipperiness imparting agent also has a function of stabilizing red blood cells in blood.

[Test Example 5]
[Surface tension of blood containing blood slipperiness agent]
The surface tension of blood containing a blood slipperiness imparting agent was measured by a pendant drop method using a contact angle meter Drop Master 500 manufactured by Kyowa Interface Science Co., Ltd. The surface tension was measured after adding a predetermined amount of blood slipperiness-imparting agent to sheep defibrinated blood and shaking sufficiently.
Although the measurement is automatically performed by the instrument, the surface tension γ is obtained by the following equation (see FIG. 7).

γ = g × ρ × (de) ² × 1 / H
g: Gravity constant 1 / H: Correction term obtained from ds / de ρ: Density de: Maximum diameter ds: Diameter at a position that is de higher than the dropping end

The density ρ is 5. in “Density Test Method and Density / Mass / Capacity Conversion Table” of JIS K 2249-1995. Based on the vibration density test method, the temperature was measured as shown in Table 4 below.
For the measurement, DA-505 of Kyoto Electronics Industry Co., Ltd. was used.
The results are shown in Table 4 below.

From Table 4, it can be seen that the blood slipperiness-imparting agent also has an action of lowering the surface tension of blood.
By reducing the surface tension of the blood, it is considered that the absorbed blood can be quickly transferred to the absorbent body without being held between the fibers of the top sheet.

[Test Example 6]
(1) Preparation of Samples 1-6 Nonwoven fabrics 1-6 were manufactured using the apparatus shown in FIGS. The fiber used was a PET / PE core-sheath composite fiber (2.2 dtex × 44 mm). The detailed manufacturing method is as described above. Nonwoven fabrics 1 to 6 were used as the top sheets of samples 1 to 6. Table 5 shows the orientation ratios of the nonwoven fabrics 1 to 6 (aspect ratio, length: machine direction (MD direction), width: width direction (CD direction)), basis weight (g / m ² ), and thickness. The degree of orientation ratio (aspect ratio) was calculated from the maximum tensile strength of the nonwoven fabric in the machine direction (MD direction) and the width direction (CD direction).

  The maximum tensile strength was calculated by the following evaluation method. A strip having a length of 100 mm and a width of 25 mm was cut out from the nonwoven fabrics 1 to 6 to be measured in the machine direction (MD direction) and the width direction (CD direction) and used as a test piece. The test piece was attached to a Tensilon tensile tester with a chuck spacing of 75 mm and a tensile test was performed at a tensile speed of 300 m / min. The maximum strength at that time was defined as the strength of the nonwoven fabric. Again, since the nonwoven fabric strength greatly depends on the basis weight, the value obtained by dividing the nonwoven fabric strength by the basis weight was used as an index representing the strength of the nonwoven fabric as the strength per unit basis weight.

A top sheet was laminated to the absorber. The absorber was used core wrap (basis weight 14 g / m ² tissue) coated with pulverized pulp (basis weight 250 g / m ^2). A hot-melt adhesive (basis weight 5 g / m ² ) was spirally applied to the interface between the top sheet and the absorber, and both were joined.

  Samples 1, 3 and 6 were prepared by applying a blood slipperiness-imparting agent (triglyceride) to the skin contact surface (skin side surface of the top sheet) of the laminate of the top sheet and the absorbent body. On the other hand, samples 2, 4 and 6 were laminated bodies of a top sheet and an absorbent body to which no blood slipperiness-imparting agent was applied.

(2) Measurement of rewetting rate, absorption rate, brush rate (absorber transfer time)
<Test method>
An acrylic plate with a hole (200 mm × 100 mm, 125 g, with a hole of 40 mm × 10 mm in the center) is placed on the skin contact surface of each sample, and from the hole, 37 ± 1 ° C. equine EDTA blood ( 3 ml of equine blood with ethylenediaminetetraacetic acid (EDTA) added to prevent coagulation (first time) using a pipette, and after 1 minute, add 3 ml of 37 ± 1 ° C equine EDTA blood Then, it was dropped again with a pipette from the hole of the acrylic plate (second time). The dropping speed was 90 mL / min. After each dripping, the time until the horse blood staying in the hole in the acrylic plate disappears is measured, and this is taken as the absorption rate (seconds). The time until the horse blood disappears from the surface and inside of the top sheet (blood The time until no red color was seen was measured, and this was taken as the brush speed (absorber transfer time) (seconds).

Immediately after the second drop of blood, the acrylic plate was removed and 10 sheets of filter paper (Advantech Toyo Co., Ltd., qualitative filter paper No. 2, 50 mm × 35 mm) were placed where the blood was dropped. A weight was placed to be cm ² . One minute later, the filter paper was taken out, and the rewet rate was calculated according to the following formula.
Rewetting rate (%) = 100 × (filter paper mass after test−initial filter paper mass) / 6

<Result>
The results of Samples 1-6 are shown in Table 6 . The sample having an orientation degree ratio (aspect ratio) close to 1: 1, and the sample 1 coated with the blood slipperiness agent had the second absorption speed, and the first and second brushing speeds were fast. In addition, since the liquid quickly migrates from the surface, the rewetting ratio is a sample whose orientation ratio (aspect ratio) is close to 1: 1, and the number of samples coated with the blood slipperiness-imparting agent was small. .

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Absorber 3a Dense part 3b Sparse part 4 Side flap 5 Side sheet 6 Embossed part 6 'Embossed part 7 Blood slipping agent containing region 8 Non-woven fabric 9 Card machine 10 Card web 11 Heat embossing device 12 Uneven roll 13 Smooth roll 14 Heat bond nonwoven fabric 15 Air through device 30 Main cylinder 31 Feed 32 Breast 33 Stripper 34 Worker 35 Doffer 36 Condensation

Claims (9)

A non-woven topsheet containing at least a heat-fusible conjugate fiber,
The absorbent article has a ratio (machine direction / width direction) of fiber orientation along the machine direction of the nonwoven fabric topsheet and fiber orientation along the width direction of 1.0 to 7.0. ,
The non-woven fabric topsheet has a kinematic viscosity of 0.01 to 80 mm ² / s at 40 ° C., a water retention of 0.01 to 4.0% by mass, and less than 1,000 in the excretory opening contact area. The absorbent article which has a blood slipperiness | lubricity imparting agent containing area | region containing the blood slipperiness | lubricity imparting agent which has a weight average molecular weight.   The absorbent article according to claim 1, wherein the ratio (machine direction / width direction) of the degree of orientation of fibers along the machine direction and the degree of orientation of fibers along the width direction is 1.0 to 4.0. .   The absorptive article according to claim 1 or 2 in which said nonwoven fabric top sheet further contains a heat extensibility fiber.   The absorbent article according to claim 3, wherein a mixing ratio (the former / the latter) of the heat-fusible conjugate fiber and the heat-extensible fiber is 20/80 to 80/20 by mass ratio.   The absorbent article according to any one of claims 1 to 4, wherein the blood slipperiness-imparting agent has an IOB of 0.00 to 0.60. The blood slipperiness imparting agent is the following (i) to (iii):
(I) hydrocarbons,
(Ii) from (ii-1) a hydrocarbon moiety and (ii-2) a carbonyl group (—CO—) and an oxy group (—O—) inserted between the C—C single bonds of the hydrocarbon moiety. A compound having one or more of the same or different groups selected from the group consisting of: (iii) (iii-1) a hydrocarbon moiety, and (iii-2) a CC single bond of said hydrocarbon moiety One or more of the same or different groups selected from the group consisting of a carbonyl group (—CO—) and an oxy group (—O—), inserted between them, and (iii-3) of the hydrocarbon moiety A compound having one or a plurality of the same or different groups selected from the group consisting of a carboxyl group (—COOH) and a hydroxyl group (—OH), which replaces a hydrogen atom;
As well as selected from the group consisting of any combination thereof,
Here, in the compound of (ii) or (iii), when two or more oxy groups are inserted, each oxy group is not adjacent,
The absorptive article according to any one of claims 1 to 5. The blood slipperiness imparting agent is the following (i ′) to (iii ′):
(I ′) hydrocarbon,
(Ii ′) (ii′-1) a hydrocarbon moiety and (ii′-2) a carbonyl bond (—CO—), an ester bond (—COO) inserted between the C—C single bonds of the hydrocarbon moiety. -), A carbonate bond (-OCOO-), and a compound selected from the group consisting of an ether bond (-O-) and having one or more same or different bonds, and (iii ') (iii'- 1) a hydrocarbon moiety and (iii′-2) a carbonyl bond (—CO—), an ester bond (—COO—), a carbonate bond (—OCOO) inserted between the C—C single bonds of the hydrocarbon moiety. -), And one or a plurality of the same or different bonds selected from the group consisting of an ether bond (-O-), and (iii'-3) a carboxyl group that replaces a hydrogen atom of the hydrocarbon moiety ( -COOH) and hydroxy A compound having one or a plurality of the same or different groups selected from the group consisting of a sil group (—OH);
As well as selected from the group consisting of any combination thereof,
Here, in the compound of (ii ′) or (iii ′), when two or more identical or different bonds are inserted, each bond is not adjacent,
The absorptive article according to any one of claims 1 to 6. The blood slipperiness imparting agent is the following (A) to (F):
(A) (A1) a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms in the chain hydrocarbon moiety, (A2) a chain hydrocarbon moiety, and the chain An ester with a compound having one carboxyl group for substituting a hydrogen atom in the hydrocarbon moiety,
(B) (B1) a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms in the chain hydrocarbon moiety, (B2) a chain hydrocarbon moiety, and the chain An ether with a compound having one hydroxyl group replacing a hydrogen atom of the hydrocarbon moiety,
(C) (C1) a carboxylic acid, a hydroxy acid, an alkoxy acid or an oxo acid containing a chain hydrocarbon moiety and 2 to 4 carboxyl groups replacing the hydrogen atom of the chain hydrocarbon moiety; C2) an ester of a chain hydrocarbon moiety and a compound having one hydroxyl group replacing a hydrogen atom of the chain hydrocarbon moiety,
(D) an ether bond (—O—), a carbonyl bond (—CO—), an ester bond (—COO—) inserted between the chain hydrocarbon moiety and the C—C single bond of the chain hydrocarbon moiety. And a compound having any one bond selected from the group consisting of a carbonate bond (—OCOO—),
(E) polyoxy C ₃ -C ₆ alkylene glycol or its alkyl ester or alkyl ether, and (F) a chain hydrocarbon,
The absorbent article according to any one of claims 1 to 7, wherein the absorbent article is selected from the group consisting of any combination thereof. The blood lubricity-imparting agent is (a ₁ ) an ester of a chain hydrocarbon tetraol and at least one fatty acid, (a ₂ ) an ester of a chain hydrocarbon triol and at least one fatty acid, (a ₃ ) chain Ester of linear hydrocarbon diol and at least one fatty acid, (b ₁ ) ether of chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol, (b ₂ ) chain hydrocarbon triol and at least one fat Ethers with aliphatic monohydric alcohols, (b ₃ ) ethers of chain hydrocarbon diols with at least one aliphatic monohydric alcohol, (c ₁ ) chain hydrocarbon tetracarboxylic acids having four carboxyl groups, hydroxy acid, alkoxy acid or an oxo acid, at least one ester of an aliphatic monohydric alcohol, (c ₂₎ a chain hydrocarbon bets with 3 carboxyl groups Carboxylic acid, hydroxy acid, alkoxy acid or an oxo acid, at least one ester of an aliphatic monohydric alcohol, (c ₃₎ a chain hydrocarbon dicarboxylic acids having two carboxyl groups, hydroxy acid, alkoxy acid or an oxo An ester of an acid and at least one aliphatic monohydric alcohol, (d ₁ ) an ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, (d ₂ ) a dialkyl ketone, (d ₃ ) a fatty acid and an aliphatic 1 Esters with dihydric alcohols, (d ₄ ) dialkyl carbonates, (e ₁ ) polyoxy C ₃ -C ₆ alkylene glycols, (e ₂ ) esters of polyoxy C ₃ -C ₆ alkylene glycols with at least one fatty acid, (e ₃ ) An ether of polyoxy C ₃ -C ₆ alkylene glycol and at least one aliphatic monohydric alcohol, and (f ₁ The absorbent article according to any one of claims 1 to 8, which is selected from the group consisting of :) chain alkanes, and any combination thereof.