JP6004878B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article.

  As a top sheet of an absorbent article, a non-woven fabric having an uneven surface and a method for producing the same are known (Patent Documents 1 to 4).

JP 2012-136790 A JP 2012-136791 A JP 2012-136792 A JP 2012-136785 A

However, menstrual blood has a high viscosity, so that it does not easily shift from the top sheet to the absorbent body and tends to remain 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 provides a liquid-permeable top sheet having a skin contact surface, a liquid-impermeable back sheet having a non-skin contact surface, the top sheet, and the back sheet. An absorbent article comprising an absorbent body provided therebetween, wherein the top sheet intersects the first direction and the first direction at least in the excretory opening contact region of the skin contact surface. Alternately disposed in the second direction, and has a plurality of convex portions protruding on the skin contact surface side and a plurality of concave portions recessed on the absorber side, wherein the plurality of convex portions are respectively A plurality of concave portions each having a bottom portion and a concave portion side wall portion extending from the bottom portion; It has fiber orientation along the extending direction, and the concave side wall portion extends in the extending direction. It has fiber orientation that Tsu, at least on the convex portion of the excretory opening contact region, kinematic viscosity at 40 ° C. is 0.01~80mm ² / s, water holding ratio 0.01 to 4.0 The absorbent article is provided with a blood slipperiness imparting agent having a mass% and a weight average molecular weight of less than 1,000.

  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 is provided.

FIG. 1 is a partially broken plan view of a sanitary napkin according to an embodiment of the absorbent article of the present invention. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a partial perspective view of a top sheet provided in the sanitary napkin shown in FIG. 1. 4A is a partially enlarged cross-sectional view of the top sheet shown in FIG. 3, and FIG. 4B is a diagram showing fiber orientations at the top of the convex portion and the bottom of the concave portion shown in FIG. 4A. FIG. 4C is a development view of the convex side wall and the concave side wall shown in FIG. FIG. 5 is a diagram illustrating a manufacturing process of the top sheet shown in FIG. FIG. 6 is a diagram for explaining a manufacturing process of the sanitary napkin shown in FIG. FIG. 7 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. 8 is a photomicrograph of menstrual blood with or without a blood slipping agent. FIG. 9 is a diagram for explaining a method of measuring the surface tension.

Hereinafter, the absorbent article of the present invention will be described.
An absorbent article according to aspect 1 is provided between a liquid-permeable top sheet having a skin contact surface, a liquid-impermeable back sheet having a non-skin contact surface, and the top sheet and the back sheet. An absorbent article comprising the absorbent body, wherein the top sheet has a first direction and a second direction intersecting the first direction at least in the excretory opening contact region of the skin contact surface. Alternately disposed in the direction of the skin, and has a plurality of protrusions protruding to the skin contact surface side, and a plurality of recesses recessed to the absorber side, the plurality of protrusions, respectively, A plurality of concave portions each having a bottom portion and a concave portion side wall portion extending from the bottom portion, and the convex side wall portion extending from the top portion. Having a fiber orientation along the direction, and the recess side wall portion is a fiber along its extending direction. It has a tropism, wherein at least the convex portion of the excretory opening contact region, kinematic viscosity at 40 ℃ is 0.01~80mm ² / s, water holding rate is 0.01 to 4.0 wt%, The absorbent article is coated with a blood slipperiness-imparting agent having a weight average molecular weight of less than 1,000.

  In the absorbent article according to aspect 1, when menstrual blood excreted from the wearer reaches the excretion opening contact region, it slides down together with the blood slipperiness imparting agent present in the convex portion, passes through the top sheet, and becomes an absorbent body. Transition. Therefore, the absorbent article according to aspect 1 has improved menstrual blood transfer from the top sheet to the absorbent body, and can reduce menstrual blood remaining on the top sheet. For this reason, the sticky feeling of the skin contact surface of the top sheet is prevented, and the smooth feeling is maintained. The effect of such a blood slipperiness-imparting agent is exerted irrespective of changes in menstrual blood discharge (that is, whether menstrual blood discharged at a time is large or small). .

  In the absorbent article according to aspect 1, the convex side wall portion extends from the top of the convex portion toward the bottom of the concave portion, and the concave portion side wall portion starts from the bottom of the concave portion at the top of the convex portion. It extends towards. Therefore, the convex side wall portion has a fiber orientation along the extending direction, that is, the direction from the top of the convex portion toward the bottom of the concave portion, and the concave side wall portion is in the extending direction, that is, the concave portion. It has fiber orientation along the direction from the bottom toward the top of the convex portion. For this reason, menstrual blood excreted from the wearer easily slides along the extending direction of the convex side wall portion and the concave side wall portion together with the blood slipperiness imparting agent. In other words, menstrual blood excreted from the wearer does not spread in the surface direction of the top sheet, but easily moves in the thickness direction of the top sheet (that is, to the absorber).

  In the absorbent article which concerns on aspect 1, since a convex part side wall part and a recessed part side wall part have fiber orientation along each extension direction, the fiber orientation of the thickness direction of a top sheet is large, and it originates in this. The top sheet has high compression deformation and compression recovery properties (cushioning properties). Therefore, even if the absorbent article is compressed, liquid return (rewetting back) from the absorbent body hardly occurs. Moreover, since the cushioning property of a top sheet is high, it gives a wearer good comfort.

  In the absorbent article according to aspect 1, since the skin contact surface of the top sheet has an uneven shape, the contact area between the wearer's skin and the top sheet is small, and the surface direction of the top sheet through the space in the recess is reduced. Good air permeability. Therefore, it is difficult to give the wearer stuffiness and itching.

  The absorbent article which concerns on aspect 1 WHEREIN: It is preferable that the fiber density of the top part of the said convex part is lower than the fiber density of the bottom part of the said recessed part (aspect 2). Since the liquid is likely to move from the one having the lower fiber density (the top of the convex part in aspect 2) to the one having the higher fiber density (the bottom part of the concave part in aspect 2), the absorbent article according to aspect 2 has the effect of the blood slipping agent. In combination with the above, it has improved menstrual transfer from the top sheet to the absorbent body.

  The absorbent article which concerns on aspect 1 WHEREIN: It is preferable that the fiber density of the top part of the said convex part is higher than the fiber density of the bottom part of the said recessed part (aspect 3). The liquid is less likely to move from the higher fiber density (the top of the convex part in aspect 3) to the lower (the bottom of the concave part in aspect 3), but the absorbent article according to aspect 3 has the effect of the blood slipperiness-imparting agent. Therefore, it has the improved menstrual blood transfer property from a top sheet to an absorber. Therefore, the effect of the blood slipperiness-imparting agent is remarkable in the absorbent article according to aspect 3. Moreover, in the absorbent article which concerns on aspect 3, since the followable | trackability of the uneven | corrugated shape of a top sheet with respect to a wearer's skin is favorable, a wearer's comfort at the time of changing a leg or walking is favorable.

  In the absorbent article according to Aspects 1 to 3, the convex side wall and / or the concave side wall can have portions having different fiber orientations (Aspect 4).

  In the absorbent article according to Aspects 1 to 4, it is preferable that the fiber orientation in the thickness direction at the bottom of the recess is smaller than the fiber orientation in the thickness direction at the side wall of the recess (Aspect 5). In the absorbent article which concerns on aspect 5, menstrual blood is easy to transfer to a thickness direction (namely, to an absorber), without accumulating in a recessed part side wall part. In addition, it is preferable that the fiber orientation in a recessed part changes to the direction perpendicular | vertical to a thickness direction as it approaches an absorber, and thereby, a gradient arises in fiber orientation and menstrual blood becomes easy to permeate | transmit and diffuse.

  In the absorbent article according to Aspects 1 to 5, it is preferable that the number of fiber fusion points at the top of the convex portion is smaller than the number of fiber fusion points at the bottom of the concave portion (Aspect 6). In the absorbent article which concerns on aspect 6, the touch of a top sheet is favorable.

  In the absorbent article according to Aspects 1 to 6, it is preferable that the constituent fibers of the top sheet are heat-sealed (Aspect 7). In the absorbent article which concerns on aspect 7, the uneven | corrugated shape of a top sheet is maintained by the heat sealing | fusion of the constituent fiber. Further, when the absorbent article is used, it is difficult for fibers to fall out and fluff from the top sheet.

  In the absorbent article according to Aspects 1 to 7, it is preferable that the top sheet contains a thermally extensible fiber (Aspect 8). Due to the thermal elongation of the heat-extensible fibers, effective uneven shaping is possible. Moreover, the heat | fever expansion | extension of a heat | fever extensible fiber prevents the fall of the fiber density and fiber amount (basis weight) of a convex part side wall part and a concave part side wall part which may arise at the time of uneven | corrugated shaping.

  In the absorbent article according to aspects 1 to 8, it is preferable that the IOB of the blood slipperiness imparting agent is an IOB of 0.00 to 0.60 (aspect 9).

In the absorbent article according to aspects 1 to 9, 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 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;
Selected from the group consisting of any combination thereof (in the compound (ii) or (iii), when two or more oxy groups are inserted, each oxy group is not adjacent) (Aspect 10).

In the absorbent article according to aspects 1 to 10, 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 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 any combination thereof (wherein (ii ′) or (iii ′) compounds wherein two or more identical or different bonds are inserted, each bond is adjacent) (Aspect 11).

In the absorbent article according to aspects 1 to 11, 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 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,
As well as being selected from the group consisting of any combination thereof (Aspect 12).

In the absorbent article according to embodiment 12, wherein the blood slipping agent, (a ₁₎ an ester of a chain hydrocarbon tetraol and at least one fatty acid, and (a ₂₎ a chain hydrocarbon triol least 1 (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₎ ) Ether of chain hydrocarbon triol and at least one aliphatic monohydric alcohol, (b ₃ ) ether of chain hydrocarbon diol and at least one aliphatic monohydric alcohol, (c ₁ ) 4 carboxyl groups chain hydrocarbon tetracarboxylic acid having a hydroxy acid, esters of alkoxy acids or oxoacids, and at least one aliphatic monohydric alcohol, (c ₂₎ 3 or Chain hydrocarbon tricarboxylic acid having a carboxyl group, hydroxy acid, alkoxy acid or oxo acid, at least one ester of an aliphatic monohydric alcohol, (c ₃₎ a chain hydrocarbon dicarboxylic acids having two carboxyl groups , An ester of a hydroxy 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 esters of fatty acids, (e ₃₎ polyoxy C ₃ -C ₆ alkylene glycol and at least one fat Ethers of monohydric alcohols, and (f ₁₎ a chain alkane, and is preferably selected from the group consisting of any combination thereof (embodiment 13).

  In the absorbent article according to Aspects 1 to 13, the blood slipperiness imparting agent preferably has a vapor pressure of 0.00 to 0.01 Pa at 1 atm and 40 ° C. (Aspect 14).

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.
Hereinafter, an embodiment of the absorbent article of the present invention will be described based on the drawings, taking a sanitary napkin as an example.

  As shown in FIGS. 1 and 2, a sanitary napkin 1 according to an embodiment of the absorbent article of the present invention includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a top sheet 2. And an absorbent body 4 provided between the back sheets 3.

  In FIG. 1, the X-axis direction corresponds to the width direction of the sanitary napkin 1, the Y-axis direction corresponds to the longitudinal direction of the sanitary napkin 1, and the plane direction extending in the X-axis Y-axis direction corresponds to the plane direction of the sanitary napkin 1. To do. The same applies to the other drawings.

  The sanitary napkin 1 is worn for the purpose of absorbing liquid excretion such as menstrual blood. At this time, the top sheet 2 is worn on the skin side of the wearer, and the back sheet 3 is worn on the clothes (underwear) side of the wearer. Liquid excreta such as menstrual blood passes through the top sheet 2 to reach the absorber 4 and is absorbed and held by the absorber 4. Leakage of liquid excretion absorbed and held by the absorber 4 is prevented by the back sheet 3.

  As shown in FIG. 1, the top sheet 2 and the back sheet 3 are joined at their longitudinal ends by seal portions 11 a and 11 b to form a main body portion 6, and end portions in the width direction are sealed portions 12 a. , 12b and substantially rectangular wings 7a, 7b extending in the width direction from the main body 6 are formed.

  The shape of the main body portion 6 can be adjusted as appropriate within a range suitable for the wearer's body, underwear, etc. Examples of the shape of the main body portion 6 include a substantially rectangular shape, a substantially oval shape, and a generally saddle shape. . The total length in the longitudinal direction of the main body 6 is usually 100 to 500 mm, preferably 150 to 350 mm, and the total length in the width direction of the main body 6 is usually 30 to 200 mm, preferably 40 to 180 mm.

  Examples of the bonding mode by the seal portions 11a, 11b, 12a, and 12b include embossing, ultrasonic waves, and a hot-melt adhesive. In order to increase the bonding strength, two or more bonding modes may be combined (for example, embossing is performed after bonding with a hot-melt adhesive).

  As the embossing, for example, a method of embossing by passing the top sheet 2 and the back sheet 3 together between an embossing roll having a patterned convex portion and a flat roll (a method called a so-called round seal), etc. Is mentioned. In this method, since each sheet is softened by heating the embossing roll and / or the flat roll, the seal portion tends to be clear. Examples of the emboss pattern include a lattice pattern, a staggered pattern, and a wavy pattern.

  As the hot melt adhesive, for example, styrene-ethylene-butadiene-styrene (SEBS), styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS) and the like, or linear Pressure-sensitive adhesives or heat-sensitive adhesives mainly composed of olefins such as low density polyethylene; water-soluble polymers (for example, polyvinyl alcohol, carboxymethyl cellulose, gelatin, etc.) or water-swellable polymers (for example, polyvinyl acetate, poly And water sensitive adhesives such as sodium acrylate). Examples of the method for applying the adhesive include spiral coating, coater coating, curtain coater coating, and summit gun coating.

  As shown in FIG. 2, adhesive portions 13 a and 13 b are provided on the clothing side of the backsheet 3 that forms the wing portions 7 a and 7 b, and on the clothing side of the backsheet 3 that forms the main body portion 6, An adhesive portion 13c is provided. The sanitary napkin 1 is obtained by attaching the adhesive part 13c to the crotch part of the underwear, bending the wing parts 7a and 7b to the outer surface side of the underwear, and attaching the adhesive parts 13a and 13b to the crotch part of the underwear. Stablely fixed to underwear.

Examples of the adhesive contained in the adhesive portions 13a, 13b, and 13c include, for example, styrene-ethylene-butylene-styrene block copolymer, styrene-butylene polymer, styrene-butylene-styrene block copolymer, styrene-isobutylene- Styrene polymers such as styrene copolymers; tackifiers such as C5 petroleum resins, C9 petroleum resins, dicyclopentadiene petroleum resins, rosin petroleum resins, polyterpene resins, terpene phenol resins; tricresyl phosphate, phthalic acid Examples include monomer plasticizers such as dibutyl and dioctyl phthalate; polymer plasticizers such as vinyl polymer and polyester.

  The top sheet 2 is a sheet through which liquid excretion such as menstrual blood can pass. One surface (upper surface in FIG. 2) of the top sheet 2 is a skin contact surface with which the wearer's skin comes into contact, and the other surface (lower surface in FIG. 2) is an absorption on which the absorber 4 is disposed. It is a body placement surface.

  Examples of the top sheet 2 include a nonwoven fabric, a synthetic resin film in which liquid permeation holes are formed, and a laminate of a synthetic resin film and a nonwoven fabric. The top sheet 2 is preferably a nonwoven fabric. As a nonwoven fabric, an air through nonwoven fabric, a heat bond nonwoven fabric, a spun bond nonwoven fabric, a melt blown nonwoven fabric, a spunlace nonwoven fabric, a needle punch nonwoven fabric, etc. are mentioned, for example.

The top sheet 2 contains a heat-fusible fiber as a constituent fiber. The constituent fibers of the top sheet 2 are heat-sealed by melting and solidifying the heat-fusible fibers, whereby the uneven shape of the top sheet 2 is maintained. Further, when the sanitary napkin 1 is used, it is difficult for fibers to fall out and fluff from the top sheet 2.

  Examples of the heat-fusible fiber include a heat-fusible fiber made of a thermoplastic resin such as polyolefin, polyester, or polyamide. Examples of the polyolefin include, for example, linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), polypropylene, polybutylene, and copolymers based on these (for example, , Ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA), ethylene-propylene random copolymer (EP)) and the like. . Polyethylene, particularly HDPE, is preferred because it has a relatively low softening point of around 100 ° C. and is excellent in heat workability, and has low rigidity and a supple feel. Examples of the polyester include linear or branched carbon atoms of up to 20 including polyethylene terephthalate (PET), polytrimethyl terephthalate (PTT), polybutylene terephthalate (PBT), polylactic acid, and polyglycolic acid. And polyesters such as polyhydroxyalkanoic acid, copolymers based on these, and copolymerized polyesters obtained by copolymerizing alkylene terephthalate as a main component with a small amount of other components. Since it has elastic resilience, it is possible to construct fibers and nonwoven fabrics having high cushioning properties, and PET is preferred from the economical point of being obtained industrially at a low cost. Examples of the polyamide include 6-nylon and 6,6-nylon.

  The fiber diameter of the heat-fusible fiber is usually 5 to 100 μm, preferably 10 to 40 μm, and the fineness of the heat-fusible fiber is usually 0.5 to 10 dtex, preferably 1 to 5 dtex. The content of the conductive fiber is usually 10 to 100% by mass, preferably 50 to 100% by mass, based on the entire constituent fibers of the top sheet 2.

  It is preferable that the top sheet 2 contains a thermally stretchable fiber as a constituent fiber. Due to the thermal elongation of the heat-extensible fibers, effective uneven shaping is possible. Moreover, the heat | fever elongation of a heat | fever extensible fiber prevents the fall of the fiber density and fiber amount (basis weight) of the convex part side wall part 82 and the concave part side wall part 92 which may arise at the time of uneven | corrugated shaping. The heat-extensible fiber may be a fiber whose actual fiber length is elongated by heat treatment (for example, a fiber whose actual fiber length is elongated due to a change in the crystalline state of the resin). Fibers that do not elongate but have an apparent fiber length (for example, crimped fibers that have an apparent fiber length that has been elongated by releasing the crimps such as zigzag, Ω, and spiral) It may be.

  Various heat-extensible fibers are known (for example, JP-A No. 2004-218183, JP-A No. 2005-350836, JP-A No. 2007-303035, JP-A No. 2007-204899, JP-A No. 2007-204901). No. 2007, No. 2007-204902, No. 2008-101285, etc.) can be appropriately selected and used.

  Examples of the heat-extensible fibers include two types of resins having different melting points or softening points (resins having a relatively high melting point or softening point are called “high melting point resins”, and resins having a relatively low melting point are “low melting point resins”. And a two-component heat-extensible composite fiber in which a low melting point resin is continuously present in the length direction on at least a part of the fiber surface. The high-melting point resin is a component that develops heat extensibility, the low melting point resin is a component that develops heat-fusibility, and the heat-extensible composite fiber is heated at a temperature lower than the melting point of the high-melting point resin component. It is extensible.

  The kind of the high melting point resin and the low melting point resin is not particularly limited as long as it has fiber forming ability. The melting point difference or softening point difference between the high melting point resin and the low melting point resin is usually 20 ° C. or higher, preferably 25 ° C. or higher.

  As the melting point of the high melting point resin and the low melting point resin, for example, the melting point measured by the following method is used. Using a differential scanning calorimeter (for example, DSC6200, manufactured by Seiko Instruments Inc.), a finely cut fiber sample (for example, 2 mg sample) was subjected to thermal analysis at a heating rate of 10 ° C./min to melt each resin. The peak temperature is measured and the measured melting peak temperature is defined as the melting point. When the melting point of the resin cannot be clearly measured by this method, the temperature at which the resin is fused to such an extent that the fiber fusing point strength can be measured as the temperature at which the molecular flow of the resin begins, is used as the softening point. Used for.

  The orientation index of the high melting point resin and the low melting point resin can be appropriately adjusted depending on the type of the resin. For example, when polypropylene is used as the high melting point resin, the orientation index is usually 60% or less, preferably 40% or less, and more preferably 25% or less. When polyester is used as the high melting point resin, the orientation index is usually 25% or less, preferably 20% or less, more preferably 10% or less. On the other hand, the orientation index of the low melting point resin is usually 5% or more, preferably 15% or more, and more preferably 30% or more. When the orientation indices of the high melting point resin and the low melting point resin are in the above ranges, the heat-extensible composite fiber can be efficiently stretched by heat treatment.

The orientation index of the high melting point resin and the low melting point resin is an index of the degree of orientation of the polymer chain of the resin constituting the fiber, and is calculated by the following formula.
Orientation index (%) = X / Y × 100
[Wherein, X is the value of birefringence of the resin in the heat-extensible conjugate fiber, and Y is the value of intrinsic birefringence of the resin. ]

  The birefringence (X in the above formula) of the resin in the thermally stretchable conjugate fiber is measured, for example, by attaching a polarizing plate to an interference microscope and polarized light in a direction parallel to and perpendicular to the fiber axis. As the immersion liquid, for example, a standard refraction liquid manufactured by Cargille is used. The refractive index of the immersion liquid is measured by, for example, an Abbe refractometer. From the interference fringe image of the composite fiber obtained by the interference microscope, a known method (for example, Journal of the Fiber Society, “Fiber structure formation in high-speed spinning of core-sheath type composite fiber”, Vol. 51, No. 9, No. 408). Page, 1995), the refractive index in the direction parallel and perpendicular to the fiber axis is obtained, and the birefringence which is the difference between the two is calculated.

  The intrinsic birefringence of the resin (Y in the above formula) is the birefringence in the state where the polymer polymer chains are perfectly oriented, and the value is, for example, the first edition of “Plastic Materials in Molding”, Appendix Table It is described in typical plastic materials used (edited by the Japan Society for Plastic Processing), Sigma Publishing, published on February 10, 1998.

  The thermal elongation rate of the heat-stretchable composite fiber at a temperature 10 ° C. higher than the melting point or softening point of the low-melting resin is preferably 0.5 to 20%, more preferably 3 to 20%, still more preferably 7.5 to 20%. Thereby, the 1st layer 21 becomes bulky by expansion | extension of a heat | fever extensible composite fiber, and the uneven structure of the skin contact surface of the 1st layer 21 becomes remarkable.

  As the thermal elongation rate, for example, the thermal elongation rate measured by the following method is used. A thermomechanical analyzer TMA-50 (manufactured by Shimadzu Corporation) is mounted with parallel fibers arranged at a distance of 10 mm between chucks and a constant load of 0.025 mN / tex is applied at a rate of temperature increase of 10 ° C./min. Raise the temperature. The change in the elongation rate of the fiber at that time was measured, and the elongation rate at the melting point or softening point of the low melting point resin and the elongation rate at a temperature 10 ° C. higher than the melting point or softening point of the low melting point resin were read. The thermal elongation rate. The reason why the thermal elongation rate is measured in the above temperature range is that, when the fiber intersection is heat-sealed, the temperature range is higher than the melting point or softening point of the low-melting resin and up to about 10 ° C. Is usually adopted.

  The heat-extensible conjugate fiber can take the form of a core-sheath type (concentric type, eccentric type), a side-by-side type, or the like. In the case of the core-sheath type composite fiber, the sheath component and the core component can be composed of a low melting point resin and a high melting point resin, respectively. Examples of the core component include polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and the like. Examples of the sheath component when the core component is PP include polyethylene (PE) such as high density polyethylene (HDPE), low density polyethylene (LDPE), and linear low density polyethylene (LLDPE), and an ethylene propylene copolymer. , Polystyrene and the like. Examples of the sheath component when the core component is PET, PBT, and the like include PP and copolymer polyester.

  The ratio (weight ratio) of the low-melting point resin to the high-melting point resin in the heat-stretchable composite fiber can be appropriately adjusted in consideration of the heat-stretchability, heat-fusibility, mechanical properties, etc. of the fiber. 90-90: 10, preferably 20: 80-80: 20, more preferably 50: 50-70: 30.

  The thickness of the heat-extensible composite fiber can be adjusted to, for example, 1.0 to 10 dtex (particularly 1.7 to 8.0 dtex), and the fiber length of the heat-extensible composite fiber is, for example, about 30 to 70 mm. Can be adjusted.

  A heat-extensible conjugate fiber having a desired thermal elongation rate can be produced, for example, by subjecting a spun conjugate fiber to a heat treatment or a crimping treatment without subjecting it to a drawing treatment.

  The conditions for the heat treatment applied to the composite fiber after spinning can be appropriately adjusted according to the types of the high-melting point resin and the low-melting point resin constituting the composite fiber. For example, in the case of a core-sheath type composite fiber in which the core component is polypropylene and the sheath component is high-density polyethylene, the heating temperature is usually 50 to 120 ° C., preferably 70 to 100 ° C., and the heating time is usually 10 -500 seconds, preferably 20-200 seconds. Examples of the heating medium include hot air and infrared rays.

  Examples of the crimping treatment applied to the composite fiber after spinning include mechanical crimping. The crimp may be in either a two-dimensional or three-dimensional manner, or a three-dimensional manifested crimp seen in an eccentric core-sheath composite fiber, side-by-side composite fiber, or the like. It may be. When the mechanical crimping involves heat, the heating process and the crimping process are performed simultaneously.

  Note that the fibers may be slightly stretched in the crimping process, but such stretching is not included in the stretching process. The drawing treatment usually means a drawing operation with a draw ratio of about 2 to 6 times performed on an undrawn yarn.

  The top sheet 2 may contain fibers other than heat-fusible fibers and heat-extensible fibers. Examples of fibers other than the heat-fusible fiber and the heat-extensible fiber include natural fibers (wool, cotton, etc.), regenerated fibers (rayon, acetate, etc.), inorganic fibers (glass fiber, carbon fiber, etc.), and the like. . When the top sheet 2 contains other fibers, the content of the other fibers can be appropriately adjusted, but is usually 95% by weight or less, preferably 80% by weight or less of the top sheet 2.

  As shown in FIGS. 2 and 3, the skin contact surface of the top sheet 2 has a large number of convex portions 8 and concave portions 9, and the skin contact surface of the top sheet 2 has an uneven shape. . Since the skin contact surface of the top sheet 2 is uneven, the contact area between the wearer's skin and the top sheet 2 is small, and the air permeability in the surface direction of the top sheet 2 through the space in the recess 9 is good. is there. Therefore, it is difficult to give the wearer stuffiness and itching.

  In the present embodiment, the convex portion 8 and the concave portion 9 are formed on substantially the entire absorber arrangement region including the excretory opening abutting region 20 in the skin contact surface of the top sheet 2. 9 should just be formed in the excretion opening | mouth contact | abutting area | region 20 at least among the skin contact surfaces of the top sheet 2. FIG. The absorber arrangement region is a region where the absorber 4 overlaps the top sheet 2 when the absorber 4 is projected onto the top sheet 2.

  The excretion opening contact area 20 is an area in which a wearer's excretion opening (for example, small labia, large labia, etc.) abuts when the sanitary napkin 1 is worn. The excretory opening contact region 20 is a region surrounded by a dotted line in FIG. 1, and is set at substantially the center of the absorber arrangement region. The position, area, and the like of the excretion opening contact region 20 can be adjusted as appropriate. The excretory opening contact area 20 may be set as an area substantially the same as the area where the excretion opening actually contacts, or may be set as a larger area, but liquid excrement such as menstrual blood From the viewpoint of preventing leakage to the outside, it is preferably set as a region larger than the region where the excretion port actually contacts. The excretion opening contact region 20 has a length of usually 50 to 200 mm, preferably 70 to 150 mm, and a width of usually 10 to 80 mm, preferably 20 to 50 mm.

  In the present embodiment, the excretion opening contact region 20 is set as a virtual region, but may be set as a visually recognizable region. Visual recognition includes, for example, coloring of the excretory opening contact region 20 and formation of a recess (for example, a recess formed by a heat embossing process) extending continuously or intermittently along the periphery of the excretion opening contact region 20. Etc. are possible.

Although not illustrated, substantially the entire excretory opening contact region 20 has a kinematic viscosity at 40 ° C. of 0.01 to 80 mm ² / s, a water retention of 0.01 to 4.0 mass%, and a weight average molecular weight. The blood slipperiness imparting agent which is less than 1,000 is applied. Refer to the separate item for details of the blood slipperiness-imparting agent.

  In the present embodiment, the blood slipperiness imparting agent is applied to substantially the entire excretory opening contact region 20, but the blood slipperiness imparting agent is at least the convex portion 8 (particularly convex in the excretion port contact region 20. It only has to be applied to the top 81) of the part 8. As long as the blood slipperiness imparting agent is applied to at least the convex portion 8 in the excretory opening contact region 20, it is applied to a portion other than the convex portion 8 (for example, the concave portion 9). Alternatively, it may be applied to a region other than the excretion opening contact area 20 (for example, a peripheral area of the excretion opening contact area 20) on the skin contact surface. For example, the blood slipperiness-imparting agent can be applied to substantially the entire skin contact surface or substantially the entire absorber arrangement region.

  By applying the blood slipperiness imparting agent to at least the convex portion 8 (particularly, the top portion 81 of the convex portion 8) in the excretory opening contact region 20, the following effects are exhibited. When menstrual blood excreted from the wearer reaches the excretory opening contact region 20, it slides down into the concave portion 9 together with the blood slipperiness imparting agent present in the convex portion 8, passes through the top sheet 2, and shifts to the absorber 4. . Therefore, the sanitary napkin 1 has improved menstrual blood transfer from the top sheet 2 to the absorbent body 4, and can reduce menstrual blood remaining on the top sheet 2. For this reason, the sticky feeling of the skin contact surface of the top sheet 2 is prevented, and a smooth feeling is maintained. The effect of such a blood slipperiness-imparting agent is exerted irrespective of changes in menstrual blood discharge (that is, whether menstrual blood discharged at a time is large or small). .

  In particular, as will be described later, the convex side wall 82 extends from the top 81 of the convex 8 toward the bottom 91 of the concave portion 9, and the concave side wall 92 starts from the bottom 91 of the concave 9. As shown in FIG. Therefore, the convex side wall 82 has a fiber orientation along the extending direction, that is, the direction from the top 81 of the convex 8 toward the bottom 91 of the concave 9, and the concave side 92 is extended. It has fiber orientation along the direction, that is, the direction from the bottom 91 of the concave portion 9 to the top 81 of the convex portion 8. For this reason, menstrual blood excreted from the wearer easily slides along the extending direction of the convex side wall portion 82 and the concave side wall portion 92 together with the blood slipperiness imparting agent. In other words, menstrual blood excreted from the wearer does not spread in the surface direction of the top sheet 2 and easily moves in the thickness direction of the top sheet 2 (that is, to the absorber 4).

  In this embodiment, since the convex part 8 and the recessed part 9 exist in the excretion opening | mouth contact | abutting area | region 20, and the excretion opening | mouth contact | abutting area | region 20 is uneven | corrugated shape, the effect of a blood slipperiness | lubricity imparting agent exhibits effectively. Is done. The effect of the blood slipperiness imparting agent can be enhanced by applying the blood slipperiness imparting agent to the concave portion 9 in addition to the convex portion 8.

  In addition, since a blood slipperiness | lubricity imparting agent acts also as a lubrication agent and reduces the friction between fibers, the suppleness of the top sheet 2 whole can be improved.

  The sanitary napkin 1 is different from known absorbent articles including skin care compositions, lotion compositions, etc., and does not require components such as emollients and immobilizing agents. It can be applied to the sheet 2.

The basis weight of the blood slipperiness imparting agent is usually about 1 to 30 g / m ² , preferably about ^{2 to 20} g / m ² , more preferably about 3 to 10 g / m ² . When the basis weight of the blood slipperiness-imparting agent is less than about 1 g / m ² , menstrual blood tends to remain in the top sheet 2, while when the basis weight of the blood slipperiness-imparting agent exceeds about 30 g / m ² , The sticky feeling during wearing tends to increase.

The basis weight of the blood slipperiness imparting agent can be measured, for example, by the following method.
(1) The range to be measured of the top sheet is cut out with a sharp blade, for example, a cutter blade, so as not to change its thickness as much as possible, and a sample is obtained.
(2) The area of the sample: SA (m ² ) and the mass: SM ₀ (g) are measured.
(3) The sample is stirred for at least 3 minutes in a solvent capable of dissolving the blood lubricity-imparting agent, such as ethanol, acetone, etc., and the blood lubricity-imparting agent is dissolved in the solvent.
(4) The sample is filtered on the filter paper whose mass has been measured, and the sample is thoroughly washed with a solvent on the filter paper. The sample on the filter paper is dried in an oven at 60 ° C.
(5) The mass of the filter paper and the sample is measured, and the mass of the filter paper is subtracted therefrom to calculate the mass of the sample after drying: SM ₁ (g).
(6) The basis weight BBS (g / m ² ) of the blood slipperiness-imparting agent is calculated based on the following formula.
BBS (g / m ² ) = [SM ₀ (g) −SM ₁ (g)] / SA (m ² )
In order to reduce the error, a plurality of samples are collected from a plurality of absorbent articles so that the total area of the samples exceeds 100 cm ² , the experiment is repeated a plurality of times, and an average value thereof is adopted.

  It is preferable that the blood slipperiness imparting agent is applied so as not to block the gaps between the fibers of the top sheet 2. For example, the blood slipperiness imparting agent adheres to the surface of the fiber of the top sheet 2 in the form of droplets or particles, or covers the surface of the fiber.

  The blood slipperiness-imparting agent is preferably applied so as to increase its surface area. Thereby, the contact area of a blood slipperiness | lubricity imparting agent and menstrual blood becomes large, and a blood slipperiness | lubricity imparting agent becomes easy to slide down with menstrual blood. When the blood slipperiness-imparting agent is present in the form of droplets or particles, the surface area can be increased by reducing the particle size.

  Examples of the method for applying the blood slipperiness-imparting agent include a method using a coating apparatus (for example, a non-contact type coater such as a spiral coater, curtain coater, spray coater, dip coater, contact type coater, etc.). . A preferred coating apparatus is a non-contact type coater. Thereby, while being able to disperse | distribute the liquid slipperiness | lubricity imparting agent of a droplet form or a particle form to the whole uniformly, the damage given to the top sheet 2 can be reduced.

  The blood slipperiness imparting agent can be applied as a coating liquid containing a volatile solvent, for example, an alcohol solvent, an ester solvent, an aromatic solvent, or the like, if desired. When the coating solution contains a volatile solvent, the viscosity of the coating solution containing the blood slipperiness-imparting agent is lowered, so that the coating process can be simplified, such as easy application and no need for heating during coating. I can plan.

  The blood slipperiness-imparting agent is, for example, a control seam HMA (Hot Melt Adhesive) as it is in the case of a liquid at room temperature or heated to lower the viscosity and heated to be liquefied in the case of a solid at room temperature. ) Can be applied by gun. By increasing the air pressure of the control seam HMA gun, it is possible to apply a particulate blood slipping agent. In addition, the application quantity of a blood slipperiness | lubricity imparting agent can be adjusted by increasing / decreasing the application quantity from a control seam HMA gun, for example.

  The blood slipperiness imparting agent may be applied when the top sheet 2 is produced, or may be applied on the production line of the sanitary napkin 1. From the viewpoint of suppressing capital investment, it is preferable to apply a blood slipperiness-imparting agent in the production line of the sanitary napkin 1, and further suppress the blood slipperiness-imparting agent from dropping and contaminating the line. Therefore, it is preferable to apply the blood slipperiness imparting agent immediately downstream of the production line, specifically, immediately before the product is enclosed in the individual package.

  As shown in FIG.2 and FIG.3, the convex part 8 has protruded to the skin contact surface side (upper side in FIG. 2) of the top sheet 2, and the recessed part 9 has the absorber arrangement | positioning surface side of the top sheet 2 ( It is depressed on the lower side in FIG.

  The convex portions 8 and the concave portions 9 are alternately arranged in the first direction and the second direction intersecting the first direction. The first direction is an arbitrary direction in the skin contact surface of the top sheet 2, and the second direction is a direction that intersects the first direction in the skin contact surface of the top sheet 2.

  As shown in FIG. 3, in the present embodiment, the first direction is the X direction, the second direction is the Y direction, and the angle at which the first direction and the second direction intersect is 90 °. . However, the first direction, the second direction, and the angle at which the first direction and the second direction intersect are not limited to the present embodiment, and can be changed as appropriate. The angle at which the first direction and the second direction intersect is preferably 30 to 90 °.

  As shown in FIG. 3, in the present embodiment, the convex portions 8 and the concave portions 9 are alternately arranged in the X direction and the Y direction to form a row, and adjacent convex portions in the rows in the X direction and the Y direction. The recesses 9 are positioned between the eight recesses 8 (that is, four recesses 9 are positioned around one protrusion 8). In the two adjacent rows, the convex portions 8 are arranged so as to be shifted by a half pitch, so that when the top sheet 2 is viewed in plan, the arrangement pattern of the convex portions 8 is a staggered pattern. Similarly, in the two adjacent rows, the concave portions 9 are arranged so as to be shifted by a half pitch, so that when the top sheet 2 is viewed in plan, the arrangement pattern of the concave portions 9 is a staggered pattern. The arrangement pattern of the convex part 8 and the recessed part 9 is not limited to this embodiment, It can change suitably. For example, the number of concave portions 9 positioned around one convex portion 8 and the number of convex portions 8 positioned around one concave portion 9 can be appropriately selected.

  The height of the convex portion 8 is usually 0.2 to 15 mm, preferably 0.5 to 5 mm, the width (X direction) is usually 1 to 20 mm, preferably 2 to 10 mm, and the length (Y direction). ) Is usually 1 to 20 mm, preferably 2 to 10 mm, and the interval between the convex portions 8 (width or length of the concave portion 9) is usually 1 to 20 mm, preferably 2 to 10 mm.

  As shown in FIG. 4, the convex part 8 has a top part 81 and a convex part side wall part 82 extending from the top part 81, and the concave part 9 is a bottom part 91 and a concave part side wall part 92 extending from the bottom part 91. And have.

  The external shape of the convex portion 8 and the concave portion 9 is hemispherical, the cross-sectional view shape is arched, and the planar view shape is circular. In addition, the external shape of the convex part 8 is a shape when the convex part 8 is seen from the skin contact surface of the top sheet 2, and the external shape of the concave part 9 is the concave part 9 from the absorber arrangement surface of the top sheet 2. It is the shape when seen. The shape of the convex part 8 and the recessed part 9 is not limited to this embodiment, It can change into another shape. Examples of other external shapes include cone shapes such as a cone, a truncated cone, a pyramid, a truncated pyramid, and an oblique cone. Examples of other planar shapes include an elliptical shape, a rectangular shape, and a polygonal shape. Can be mentioned.

  As shown in FIG. 2, the inside of the convex part 8 is a cavity. A ridge-shaped connecting portion may be formed between the adjacent convex portions 8 and between the adjacent concave portions 9. The internal spaces of the adjacent convex portions 8 may or may not communicate with each other through this connecting portion.

  When the skin contact surface side of the top sheet 2 is set to the upper side and the absorber arrangement surface side is set to the lower side, the convex portion side wall portion 82 has a tapered shape whose diameter gradually increases downward. Has a tapered shape with a diameter gradually increasing upward. The convex side wall portion 82 extends downward from the top portion 81, and the lower end portion thereof is continuous with the upper end portion of the concave side wall portion 92 extending upward from the bottom portion 91. That is, the convex side wall 82 extends in the direction from the top 81 to the bottom 91, and the concave side wall 92 extends in the direction from the bottom 91 to the top 81. Accordingly, the extending direction of the convex side wall 82 is a direction from the top 81 to the bottom 91, and the extending direction of the concave side wall 92 is a direction from the bottom 91 to the top 81.

  The shape of the convex side wall portion 82 and the concave side wall portion 92 is not limited to the shape of the present embodiment, and can be changed to other shapes. Examples of other shapes include a cylindrical shape and a rectangular tube shape.

The convex side wall portion 82 has fiber orientation along the extending direction (that is, the direction from the top portion 81 to the bottom portion 91), and the concave side wall portion 92 is extended in the extending direction (that is, from the bottom portion 91 to the top portion). Fiber orientation along the direction toward 81). Specifically, as shown in FIG. 4C, when the convex side wall portion 82 and the concave side wall portion 92 are developed, the convex side wall portion 82 has a fiber orientation OR along its extending direction D _{82. 82} , and the recess side wall portion 92 has a fiber orientation OR ₉₂ along the extending direction D ₉₂ thereof. Although not shown, in the plan view, the convex side wall 82 has a radial fiber orientation that converges toward the top 81, and the concave side wall 92 is a radial fiber that converges toward the bottom 91. Has orientation. The convex side wall portion 82 and the concave side wall portion 92 have fiber orientation along the respective extending directions, whereby the fiber orientation in the thickness direction of the top sheet 2 is increased. The compression deformation property and compression recovery property (cushion property) of No. 2 are improved. Therefore, even if the sanitary napkin 1 is compressed, liquid return (rewetting back) from the absorbent body 4 hardly occurs. Moreover, since the cushioning property of the top sheet 2 is high, the wearer is given good comfort.

  In the specific example shown in FIG. 4C, the convex side wall portion 82 and the concave side wall portion 92 have substantially the same fiber orientation throughout the circumferential direction, but have portions with different fiber orientations. It may be. For example, the convex part side wall part 82 and the concave part side wall part 92 may have a part in which the fiber orientation before uneven forming is maintained. For example, when the fibers are heat-sealed before the uneven shaping, the fiber orientation before the uneven shaping is maintained even after the uneven shaping. The portions having different fiber orientations have, for example, fiber orientations along a direction orthogonal to the extending direction of the convex side wall portions 82 or the concave side wall portions 92. When the nonwoven fabric is manufactured, since the fibers are usually heat-sealed in a state where the fibers are oriented in the MD direction, the fibers are formed on the convex side wall portions 82 and the concave side wall portions 92 in the MD direction cross section. Although oriented in the extending direction of the side wall 92, the fibers are oriented in the direction perpendicular to the extending directions of the convex side wall 82 and the concave side wall 92 in the cross section in the CD direction.

  The fiber orientation is a concept consisting of the orientation angle and orientation strength of the fiber, and can be measured, for example, by the following method. The sample is allowed to stand so that the skin contact surface of the top sheet is positioned on the upper side. Using a microscope (for example, a scanning electron microscope such as JCM-5100 manufactured by JEOL Ltd.), an enlarged image is taken from a direction perpendicular to the measurement surface of the sample, printed, and transparent PET property Trace the fiber on the sheet. The magnified image is an image magnified to a magnification that can measure 10 or more fibers, and the magnification is, for example, 50 to 300 times. The image is taken into a personal computer, and the image is binarized by using a NexusNewQube (stand-alone version) image processing software manufactured by Nexus Corporation. Using Fiber Orientation Analysis 8.13 Single, which is a fiber orientation analysis program, the orientation angle and orientation strength are obtained from the binarized image. The orientation angle is the angle at which the fibers are most oriented, and the orientation strength is the strength at that orientation angle. It shows that the fiber is orientating in the extending direction of a convex part side wall part or a recessed part side wall part, so that an orientation angle is near 90 degrees. Moreover, it shows that the direction of a fiber has gathered, so that orientation strength is large. The case where the orientation strength is 1.05 or more is assumed to be oriented. The measurement is repeated several times (for example, 3 to 5 times), and the average value is calculated.

As shown in FIG. 4B, the fiber orientation at the top 81 of the convex portion 8 is different from the fiber orientation at the bottom 91 of the concave portion 9. That is, the fiber orientation OR _{81 at} the top 81 of the convex portion 8 is along the thickness direction, but the fiber orientation OR _{91 at} the bottom 91 of the concave portion 9 is not along the thickness direction. Along the direction perpendicular to the thickness direction.

Regarding the fiber orientation OR ₈₁ of the top 81 of the convex portion 8, the orientation angle is preferably 50 ° to 130 °, and the orientation strength is preferably 1.05 or more. As a result, liquid excreta such as menstrual blood easily moves from the convex portion 8 to the concave portion 9.

With respect to the fiber orientation OR _{91 at} the bottom 91 of the recess 9, the orientation angle is preferably 0 ° to 50 ° or 130 ° to 180 °, and the orientation strength is preferably less than 1.05. Thereby, the balance of the tensile strength of MD direction and CD direction of the top sheet 2 is maintained, and the fracture | rupture of the top sheet 2 which may arise at the time of use of the sanitary napkin 1 is prevented.

  The fiber orientation in the thickness direction at the bottom 91 of the recess 9 is preferably smaller than the fiber orientation in the thickness direction at the recess side wall 92. Thereby, menstrual blood easily moves in the thickness direction (that is, to the absorbent body 4) without accumulating in the recess side wall portion 92. In addition, it is preferable that the fiber orientation in the recessed part 9 changes in a direction perpendicular to the thickness direction as the absorber 4 is approached, whereby a gradient occurs in the fiber orientation, and menstrual blood is easily transmitted and diffused. Become. From such a viewpoint, the orientation angle of the recess side wall portion 92 is preferably 50 ° to 130 °, and the orientation strength is preferably 1.05 or more. The orientation angle of the bottom 91 of the recess 9 is preferably 0 ° to less than 50 ° or 130 ° to 180 °, and the orientation strength is preferably less than 1.05.

The relationship between the fiber orientation OR _{81 at} the top 81 of the convex portion 8 and the fiber orientation OR _{91 at} the bottom 91 of the concave portion 9 is preferably OR ₈₁ > OR ₉₁ . Thereby, the top part 81 of the convex part 8 has the compressive deformation property and compression recovery property (flexibility) superior to the bottom part 91 of the concave part 9.

  Regarding the fiber orientation of the bottom 91 of the recess 9, it is preferable that the fiber orientation in the skin contact surface side portion and the fiber orientation in the absorbent body placement surface side portion are substantially equal. That is, it is preferable that radial fiber orientation toward the bottom portion 91 of the recess 9 exists in both the skin contact surface side portion and the absorber arrangement surface side portion. Thereby, the compression deformability and the compression recovery property (flexibility) of the bottom 91 of the recess 9 are improved, and the bottom 91 of the recess 9 is not easily crushed.

  The fiber density of the top part 81 of the convex part 8 may be smaller or larger than the fiber density of the bottom part 91 of the concave part 9. Since the liquid easily moves from the lower fiber density to the higher fiber density according to the density gradient, when the fiber density at the top 81 of the convex portion 8 is smaller than the fiber density at the bottom 91 of the concave portion 9, the sanitary napkin 1 is Combined with the action and effect of the blood slipperiness-imparting agent, it has improved menstrual blood transfer from the top sheet 2 to the absorber 4. On the other hand, since the liquid is less likely to move from the higher fiber density to the lower fiber density, when the fiber density at the top 81 of the convex portion 8 is smaller than the fiber density at the bottom 91 of the concave portion 9, menstrual blood migration is less than the fiber density. Although it is inhibited by the density gradient, the sanitary napkin 1 has an improved menstrual transfer property from the top sheet 2 to the absorbent body 4 due to the action effect of the blood slipperiness imparting agent. Therefore, the effect of the blood slipperiness imparting agent is remarkable when the fiber density of the top portion 81 of the convex portion 8 is larger than the fiber density of the bottom portion 91 of the concave portion 9. In addition, when the fiber density of the top portion 81 of the convex portion 8 is larger than the fiber density of the bottom portion 91 of the concave portion 9, the followability of the uneven shape of the top sheet 2 to the wearer's skin becomes good, so the wearer Good comfort when rearranging and walking.

The fiber density can be measured, for example, by the following method. The cut surface of the top sheet 2 is enlarged and observed using a microscope (for example, a scanning electron microscope such as JCM-5100 manufactured by JEOL Ltd.). The magnification is adjusted to a magnification (for example, 150 to 500 times) at which 30 to 60 fiber cross sections can be measured. The fiber density (lines / mm ² ) is calculated based on the number of fiber cross sections and the visual field area where the number of fiber cross sections is measured. The measurement is performed at several places (for example, 3 to 5 places), and an average value is calculated. Thus, the fiber density of the top part 81 of the convex part 8 measured is preferably 30 to 150 pieces / mm ² , more preferably 60 to 100 pieces / mm ² , and the fiber density of the bottom part 91 of the concave part 9 is The number is preferably 150 to 600 / mm ² , more preferably 300 to 550 / mm ² .

It is preferable that the fiber amount of the top part 81 of the convex part 8 and the fiber amount of the bottom part 91 of the recessed part 9 are substantially equal. Thereby, compression deformation property and compression recovery property improve. In addition, changes in feel and breakage due to fiber unevenness are less likely to occur. The fiber amount can be measured, for example, by the following method. A measurement site is magnified using a microscope (for example, a digital microscope VHX-1000 manufactured by Keyence). The magnification is, for example, 10 to 100 times. The thickness of the top of the convex part (T ₈₁ in FIG. 4A) and the thickness of the bottom of the concave part (T ₉₁ in FIG. 4A) were measured several times (for example, 3 to 5 times), and the average value thereof (Mm) is calculated. The fiber density (lines / mm ² ) is measured by the fiber density measurement method described above, and the fiber amount (lines / mm ³ ) is calculated based on the fiber amount = thickness (mm) × fiber density (lines / mm ² ). calculate.

It is preferable that the fiber density of the skin contact surface side portion of the top portion 81 of the convex portion 8 is smaller than the fiber density of the absorber arrangement surface side portion. Thereby, compression deformation property and compression recovery property improve. The fiber density of the skin contact surface side portion of the top portion 81 of the convex portion 8 is preferably 10 to 50 fibers / mm ² , more preferably 15 to 30 fibers / mm ² , and the fiber density in the absorber arrangement surface side portion. Is preferably 20 to 100 pieces / mm ² , more preferably 45 to 70 pieces / mm ² . The ratio of the fiber density of the absorber arrangement surface side portion to the fiber density of the skin contact surface side portion is preferably about 2 to 5 times. Thereby, compression deformation property and compression recovery property improve.

The number of fiber fusion points at the top portion 81 of the convex portion 8 is preferably smaller than the number of fiber fusion points at the bottom portion 91 of the concave portion 9. Thereby, the touch of the top sheet 2 becomes favorable. The number of fiber fusion points is calculated by counting the number of fiber fusion points per unit area (1 mm ² ). The number of fiber fusion points at the top portion 81 of the convex portion 8 is preferably 30 to 130 pieces / mm ² , more preferably 50 to 100 pieces / mm ² . The number of fiber fusion points at the bottom 91 of the recess 9 is preferably 250 to 500 / mm ² , more preferably 300 to 450 / mm ² .

The thickness T ₈₁ of the top 81 of the convex part 8 is usually 0.1 to 5 mm, preferably 0.3 to 2.5 mm, and the thickness T ₈₂ of the convex side wall part ₈₂ is usually 0.1 to 5 mm, preferably Is 0.3 to 2.5 mm, the thickness T ₉₁ of the bottom 91 of the recess 9 is usually 0.1 to 5 mm, preferably 0.3 to 2.5 mm, and the thickness T ₉₂ of the recess side wall ₉₂ is The thickness is usually 0.1 to 5 mm, preferably 0.3 to 2.5 mm. It is preferable that the relationship between the thicknesses of the respective parts is T ₈₁ > T ₈₂ and T ₉₂ > T ₉₁ .

The thickness of the top sheet 2 under a load of 3 gf / cm ² is usually 0.2 to 20 mm, preferably 0.5 to 10 mm. The basis weight of the top sheet 2 (average value of the entire sheet) is usually 10 to 100 g / m ² , preferably 20 to 50 g / m ² .

  Since the liquid tends to shift from a portion having a low fiber density to a portion having a high fiber density, the presence / absence and degree of the fiber density gradient of the top sheet 2 contains a colored liquid (for example, a pigment). (Liquid) is dropped, and the color density after dropping can be evaluated. That is, the dark part can be evaluated as a part with a large liquid migration amount, that is, a part with a relatively high fiber density, and the light color part has a small liquid migration amount, that is, a fiber density. It can be evaluated as a relatively small portion.

The basis weight of the top sheet 2 can be measured as follows.
(1) Mark the range to be measured and measure its area: SA _α (m ² ). In order to reduce the error, marking is performed so that the total area of the sample exceeds 5 cm ² .
(2) The marked range is cut out with a sharp blade, for example, a replacement blade of a cutter, and the total mass: TM (g) is measured.
(3) Basis weight BS _α (g / m ² ) of the range to be measured is calculated based on the following formula.
BS _α (g / m ² ) = TM (g) / SA _α (m ² )

  The top sheet 2 may be hydrophilized. Examples of the hydrophilic treatment include coating of the surface of the top sheet 2 with a hydrophilic agent, addition of a hydrophilic agent to a component, corona treatment, plasma treatment, and the like. When the top sheet 2 is hydrophilized, the lipophilic region derived from the blood slipping agent and the hydrophilic region derived from the hydrophilic agent coexist sparsely in the top sheet 2, and menstrual blood is in the top sheet 2. It slips down from the convex part 8 of this, and it becomes easy to transfer to an absorber.

  The back sheet 3 is a sheet through which liquid excretion such as menstrual blood cannot pass and can prevent leakage of liquid excretion absorbed by the absorbent body 4. One surface (upper surface in FIG. 2) of the back sheet is an absorber arrangement surface on which the absorber 4 is arranged, and the other surface (lower surface in FIG. 2) is a non-skin contact surface (this embodiment). Then, the wearer's clothes (underwear) are in contact with each other). The backsheet 3 preferably has moisture permeability in addition to liquid impermeability in order to reduce stuffiness when worn.

  Examples of the backsheet 3 include waterproof nonwoven fabric, synthetic resin (eg, polyethylene, polypropylene, polyethylene terephthalate, etc.) film, and composite sheet of nonwoven fabric and synthetic resin film (eg, nonwoven fabric such as spunbond and spunlace). And a composite film in which a breathable synthetic resin film is bonded), an SMS nonwoven fabric in which a melt-blown nonwoven fabric having high water resistance is sandwiched between strong spunbond nonwoven fabrics, and the like.

  The absorber 4 contains an absorbent material that absorbs liquid excreta such as menstrual blood. The absorbent material contained in the absorber 4 is not particularly limited as long as it can absorb and retain liquid excretion such as menstrual blood. Examples of the absorbent material include a water-absorbing fiber and a highly water-absorbing material (for example, a highly water-absorbing resin and a highly water-absorbing fiber). The absorber 4 includes additives such as an antioxidant, a light stabilizer, an ultraviolet absorber, a neutralizer, a nucleating agent, an epoxy stabilizer, a lubricant, an antibacterial agent, a flame retardant, an antistatic agent, a pigment, and a plasticizer. You may contain as needed.

  Examples of water-absorbing fibers include wood pulp obtained from softwood or hardwood (for example, mechanical pulp such as groundwood pulp, refiner ground pulp, thermomechanical pulp, chemithermomechanical pulp; kraft pulp, sulfide pulp, alkaline pulp, etc. Chemical pulp; semi-chemical pulp, etc.]; mercerized pulp or crosslinked pulp obtained by subjecting wood pulp to chemical treatment; non-wood pulp such as bagasse, kenaf, bamboo, hemp, cotton (for example, cotton linter); rayon, fibril Examples include regenerated cellulose such as rayon; semi-synthetic cellulose such as acetate and triacetate, but pulverized pulp is preferred because it is low in cost and easy to mold.

  Examples of the superabsorbent material include starch-based, cellulose-based, and synthetic polymer-based superabsorbent materials. Examples of starch-based or cellulose-based superabsorbent materials include starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and crosslinked products of sodium carboxymethyl cellulose, and synthetic polymers. Examples of high water-absorbing materials include polyacrylates, polysulfonates, maleic anhydrides, polyacrylamides, polyvinyl alcohols, polyethylene oxides, polyaspartates, polyglutamates , Polyalginate-based, starch-based, and cellulose-based superabsorbent polymers (SAP), and the like. Among these, polyacrylate-based (particularly, sodium polyacrylate-based) superabsorbent Resins are preferred. Examples of the shape of the superabsorbent material include a particulate shape, a fibrous shape, a scale shape, and the like. .

  When the absorber 4 contains a superabsorbent material (for example, a superabsorbent resin, a superabsorbent fiber, etc.), the content of the superabsorbent material is usually 5 to 80% by mass of the absorber 4, preferably 10 -60 mass%, More preferably, it is 20-40 mass%.

  The absorber 4 may contain silver, copper, zinc, silica, activated carbon, an aluminosilicate compound, zeolite, and the like. Thereby, functions, such as a deodorizing property, antibacterial property, and an endothermic effect, can be provided to an absorber.

The thickness, basis weight, etc. of the absorbent body 4 can be appropriately adjusted according to the characteristics (for example, absorbency, strength, lightness, etc.) that the sanitary napkin 1 should have. The thickness of the absorber 4 is usually 0.1 to 15 mm, preferably 1 to 10 mm, more preferably 2 to 5 mm, and the basis weight is usually 20 to 1000 g / m ² , preferably 50 to 800 g / m ² , and further Preferably it is 100-500 g / m < ² >. In addition, the thickness, basis weight, etc. of the absorber 4 may be constant throughout the absorber 4 or may be partially different.

  The absorbent body 4 is preferably in a form having a core containing an absorbent material and a core wrap covering the core. The core wrap is not particularly limited as long as it has liquid permeability and absorber retention. Examples of the core wrap include a nonwoven fabric, a woven fabric, a synthetic resin film in which liquid permeation holes are formed, and a net-like sheet having a mesh. However, from the viewpoint of low cost, a wet method using pulverized pulp as a main material A tissue molded with is preferred.

  The sanitary napkin 1 may include a second sheet disposed between the top sheet 2 and the absorbent body 4 in addition to the top sheet 2. In this case, the blood slipperiness imparting agent may be applied to the second sheet.

  The second sheet is not particularly limited as long as liquid excretion such as menstrual blood can permeate, and the thickness, basis weight, density, etc. of the second sheet are appropriately adjusted within a range where liquid excretion such as menstrual blood can permeate. can do.

  Examples of the second sheet include a nonwoven fabric, a woven fabric, a synthetic resin film in which liquid permeation holes are formed, and a net-like sheet having a mesh. Examples of the nonwoven fabric include air-through nonwoven fabric, spunbond nonwoven fabric, point bond nonwoven fabric, spunlace nonwoven fabric, needle punched nonwoven fabric, melt blown nonwoven fabric, and combinations thereof (for example, SMS). For example, natural fibers (wool, cotton, etc.), regenerated fibers (rayon, acetate, etc.), inorganic fibers (glass fibers, carbon fibers, etc.), synthetic resin fibers (polyethylene, polypropylene, polybutylene, ethylene-vinyl acetate copolymer, Polyolefins such as ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer resin; Polyesters such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polylactic acid; Polyamides such as nylon De), and the like. Nonwoven fabrics include core / sheath fibers, side-by-side fibers, island / sea fibers, etc .; hollow fibers; flat fibers, Y-shaped fibers, C-shaped fibers, etc .; latent crimps or manifestations Crimped three-dimensional crimped fibers; split fibers that are split by a physical load such as water flow, heat, and embossing may be mixed.

Hereinafter, an embodiment of a method for producing the sanitary napkin 1 will be described with reference to the drawings.
The manufacturing method which concerns on this embodiment cuts out the process (process 1) of laminating an absorber, the process of laminating a top sheet (process 2), the process of laminating a back sheet (process 3), and a sanitary napkin. A manufacturing apparatus 200 shown in FIG. 6 is used, including a step (step 4) and a step (step 5) of applying a blood slipperiness-imparting agent to a sanitary napkin.

[Step 1]
On the peripheral surface of the suction drum 220 that rotates in the transport direction MD, recesses 224 are formed at a required pitch in the circumferential direction as a mold for filling the absorbent material 222. When the suction drum 220 rotates and the recess 224 enters the material supply unit 221, the suction unit 226 acts on the recess 224, and the absorber material 222 supplied from the material supply unit 221 is sucked into the recess 224 by vacuum. The material supply unit 221 is formed so as to cover the suction drum 220, and the material supply unit 221 supplies the absorber material 222 to the recess 224 by air conveyance, and the absorber 4 is formed in the recess 224. The The absorber 4 formed in the recess 224 is transferred onto the carrier sheet 210 that proceeds in the transport direction MD.

[Step 2]
The top sheet 2 is laminated on the absorber 4 to form a laminate LB1. In addition, the manufacturing method of the top sheet 2 is mentioned later.
Then, a pressing groove is formed in the laminated body LB1 as necessary. The compressed groove is formed by the embossing device 230. The embossing device 230 includes an upper roll 231 having a convex portion (not shown) provided on the outer peripheral surface, and a lower roll 232 having a smooth outer peripheral surface. The convex portion of the upper roll 231 is formed so as to correspond to the shape of the compressed groove, the arrangement pattern, and the like. When the laminated body LB1 passes between the upper roll 231 and the lower roll 232 of the embossing device 230, the laminated body LB1 is compressed in the thickness direction, and a compressed groove is formed in the laminated body LB1. The compressed groove is formed, for example, in the periphery of the excretory opening contact area 20, the peripheral area of the peripheral area of the excretion opening contact area 20, or the like in the top sheet 2. The top sheet 2 is integrated with the absorbent body 4 by forming the compressed grooves. The pressing groove forming step by the embossing device 230 is omitted when it is not necessary.

[Step 3]
The back sheet 3 supplied from the back sheet roll 240 is laminated on the lower surface (opposite side of the top sheet 2) of the laminated body LB2 via an adhesive layer to form the laminated body LB3. In addition, when the formation process of the pressing groove by the embossing apparatus 230 is abbreviate | omitted, the laminated body LB2 and the laminated body LB3 are the same.

[Step 4]
The laminate LB3 is cut using the cutter 250, and a sanitary napkin is cut out.

[Step 5]
The blood slipperiness imparting agent 261 is applied to the top sheet 2 of the sanitary napkin using the spray 260 to form a blood slipperiness imparting agent layer on the surface of the top sheet 2. The blood slipperiness-imparting agent layer is formed at least in the excretion opening contact region 20 in the skin contact surface of the top sheet 2.

  In this embodiment, the blood slipperiness-imparting agent is applied after cutting out the sanitary napkin, but it may be applied at any stage before cutting out, or it may be applied in the top sheet manufacturing process. Good. In order to prevent the blood slipperiness-imparting agent applied during production from flowing down, it is preferable to apply the blood slipperiness-imparting agent immediately downstream of the manufacturing process, for example, immediately before packaging a sanitary napkin.

  The manufacturing method of the sanitary napkin 1 can include the steps of forming the seal portions 7a, 7b, 8a, and 8b, the steps of forming the adhesive portions 9a, 9b, and 9c, in addition to steps 1 to 5.

<Top sheet manufacturing method>
Hereinafter, an embodiment of a method for manufacturing the top sheet 2 will be described with reference to the drawings.
In the manufacturing method according to the present embodiment, a manufacturing apparatus 100 shown in FIG. 5 is used.

  As shown in FIG. 5, the conveyor belt 110 rotates in the conveyance direction MD while being supported by the upper rollers 111a and 111b and the lower rollers 111c and 111d. A plurality of protrusions 112 are formed on the web conveyance surface of the conveyor belt 110, and the web conveyance surface is uneven. Further, a plurality of vent holes (not shown) are formed on the web conveyance surface of the conveyor belt 110.

  The protrusion 112 has a tapered shape whose diameter gradually decreases toward the tip, and the tip has a roundness. The height of the protrusion 112 is, for example, 0.5 to 20 mm. If the height of the projection 112 is too low, the uneven shaping on the fiber web 50 may be insufficient, while if too high, the projection 112 may penetrate the fiber web 50 when hot air is blown. . From this viewpoint, the height of the protrusion 112 is preferably 1 to 10 mm. The pitch in the MD direction of the protrusions 112 is 1 to 20 mm, and the pitch in the direction perpendicular to the MD direction (CD direction) is 1 to 20 mm. The CD direction coincides with the width direction of the fiber web 50.

  The opening ratio (total area of the air holes / surface area of the conveyor belt 110) of the air holes (not shown) is preferably 20 to 45%, more preferably 25 to 40%. If the opening ratio is too low, the uneven shaping on the fiber web 50 may be insufficient, while if it is too high, the fiber web 50 will enter the vent hole when hot air is blown, and it will be difficult to peel off from the conveyor belt 110.

  The conveyor belt 110 that rotates while being supported by the rollers 111a to 111d supports the fiber web 50 by the protrusions 112 formed on the conveying surface thereof and conveys it in the MD direction.

  As shown in FIG. 5, a pair of drive rolls 151 and 152 are provided on the upstream side of the conveyor belt 110. The drive rolls 151 and 152 supply the fiber web 50 manufactured by the card machine to the conveyor belt 110. Between the driving rolls 151 and 152 and the first nozzle 120, a tension detector (not shown) and the peripheral speed V1 of the driving rolls 151 and 152 are controlled based on the magnitude of the tension detected by the tension detector. And a control unit (not shown). The control unit adjusts the peripheral speed V1 of the drive rolls 151 and 152 relative to the peripheral speed V2 of the conveyor belt 110 based on the detection output of the tension detector. Thereby, the tension of the fiber web 50 supplied to the first nozzle 120 is adjusted to a desired tension. When the tension detected by the tension detector is greater than the desired tension, the control unit increases the circumferential speed V1 of the drive rolls 151 and 152 to the first nozzle 120 than the circumferential speed V2 of the conveyor belt. The tension of the fiber web 50 is reduced. On the other hand, when the tension detected by the tension detector is smaller than the desired tension, the control unit makes the peripheral speed V1 of the drive rolls 151 and 152 smaller than the peripheral speed V2 of the conveyor belt 110, and causes the first nozzle 120 to The tension of the supplied fiber web 50 is increased. The peripheral speed V1 of the drive rolls 151 and 152, which is relatively adjusted, is the speed of the roll surface, and the peripheral speed V2 of the conveyor belt 110 is the speed of the web conveyance surface.

  As shown in FIG. 5, the manufacturing apparatus 100 sprays the 1st nozzle 120 which performs the 1st air through process by spraying the 1st heating fluid H1 in order toward MD direction, and the 2nd heating fluid H2. A second nozzle 130 that performs the second air-through process and a third nozzle 140 that sprays the third heating fluid H3 and performs the third air-through process are provided. In addition, the manufacturing apparatus 100 includes a cooling unit 160 that is disposed between the second nozzle 130 and the third nozzle 140 and that cools the fiber web 50. The first nozzle 120 and the second nozzle 130 perform an uneven shape forming process for the fiber web 50, and the third nozzle 140 performs a fuzz reduction process. If it is not necessary to reduce fuzz, the processing by the third nozzle 140 may be omitted.

[First air-through process]
The first air-through process is a process in which the first heating fluid H1 is sprayed by the first nozzle 120 onto the fiber web 50 that is supported and conveyed by the protrusion 112 of the conveyor belt 110. By spraying the first heating fluid H1, the fiber web 50 is shaped into a concavo-convex shape along the shape of the projection 112 of the conveyor belt 110, and the constituent fibers of the fiber web 50 are melted by heat-fusible fibers. The uneven shape is maintained by heat fusion by solidification.

  The first nozzle 120 ejects the first heated fluid H1 from its ejection holes (not shown) and sprays the first heated fluid H1 substantially perpendicularly to the fiber web 50 on the conveyor belt 110.

  As the first heating fluid H1, air, water vapor or the like heated to a predetermined temperature by a first heater (not shown) provided in the first nozzle 120 is used. The first heating fluid H1 is heated by the first heater up to a temperature at which the uneven shape of the fiber web 50 applied by spraying the first heating fluid H1 is maintained by thermal fusion of the constituent fibers of the fiber web 50. Heated. For example, when the fiber web 50 contains a core-sheath type composite fiber in which the sheath component (low melting point component) is polyethylene (PE) and the core component (high melting point component) is polyethylene terephthalate (PET), the first The temperature of the heating fluid H1 is preferably 80 to 155 ° C, more preferably 130 to 135 ° C. If the temperature of the first heating fluid H1 is too lower than the melting point of the low melting point component of the core-sheath composite fiber, the uneven shaping of the fiber web 50 becomes insufficient, while if it is too high than the melting point of the low melting point component, Since the constituent fibers of the fiber web 50 are rapidly fused and the degree of freedom of the fibers is reduced, the uneven shaping of the fiber web 50 becomes insufficient.

  The wind speed of the 1st heating fluid H1 becomes like this. Preferably it is 20-120 m / sec, More preferably, it is 40-80 m / sec. In addition, if the wind speed of the 1st heating fluid H1 is too slow, the fiber web 50 will not fully follow the projection part 112, and the uneven | corrugated shaping of the fiber web 50 will become inadequate, On the other hand, if the wind speed is too fast, the fiber web 50 constituent fibers are selected by the protrusion 112, and the uneven shaping of the fiber web 50 becomes insufficient.

  The spraying time of the first heating fluid H1 is preferably 0.01 to 0.5 seconds, more preferably 0.04 to 0.08 seconds. When the spraying time is too short, the unevenness shaping of the fiber web 50 becomes insufficient. On the other hand, when the spraying time is too long, the constituent fibers of the fiber web 50 are selected by the protrusions 112, and the unevenness shaping of the fiber web 50 is performed. It becomes insufficient.

  When the first heated fluid H1 is sprayed by the first nozzle 120 onto the fiber web 50 supported and conveyed by the protrusion 112 of the conveyor belt 110, the desired speed is adjusted by adjusting the peripheral speed V1 of the drive rolls 151 and 152. The convex part side wall part and concave part side wall part which have the fiber density and fiber amount (basis weight) are formed. For example, when the fiber web 50 is processed by the first nozzle 120 by setting the peripheral speed V1 of the drive rolls 151 and 152 to be higher than the peripheral speed V2 of the conveyor belt 110, the fiber web 50 is over-fed and uneven. A decrease in fiber density and fiber amount (basis weight) of the convex side wall and the concave side wall that may occur during shaping is prevented. The circumferential speed V1 of the drive rolls 151, 152 is preferably 1 to 2 times, more preferably 1 to 1.5 times the circumferential speed V2 of the conveyor belt 110.

  The first heated fluid H <b> 1 that has passed through the fiber web 50 is discharged from the duct 121 to the outside through the vent holes of the conveyor belt 110.

  The fiber web 50 that has undergone the first air-through process is conveyed to the position of the second nozzle 130 while being placed on the conveyor belt 110.

[Second air-through process]
A 2nd air through process is a process of spraying the 2nd heating fluid H2 with the 2nd nozzle 130 with respect to the fiber web 50 which passed the 1st air through process. By spraying the second heating fluid H2, the constituent fibers of the fiber web 50 are heat-sealed by melting and solidifying the heat-fusible fibers, and the uneven shape of the fiber web 50 applied in the first air-through process is fixed. The In this way, the fibrous web 50 is formed with unevenness through the first and second air-through processes.

  The second nozzle 130 ejects the second heated fluid H <b> 2 from its ejection hole (not shown) and sprays it almost perpendicularly to the fiber web 50 on the conveyor belt 110.

  As the second heating fluid H2, air, water vapor or the like heated to a predetermined temperature by a second heater (not shown) provided in the second nozzle 130 is used. The second heating fluid H <b> 2 is heated by the second heater to a temperature at which the constituent fibers of the fiber web 50 are heat-sealed while the uneven shape of the fiber web 50 is maintained. When the fiber web 50 is a composite fiber having a low-melting-point component and a high-melting-point component having a higher melting point than the low-melting-point component, the second heating fluid H2 has a temperature from the melting point of the low-melting-point component to the melting point of the high-melting-point component. Be controlled. For example, when the fiber web 50 contains a core-sheath type composite fiber in which the sheath component (low melting point component) is PE and the core component (high melting point component) is PET, the temperature of the second heating fluid H2 is: Preferably it is 130-155 degreeC, More preferably, it is 135-150 degreeC. If the temperature of the second heating fluid H2 is too low, the thermal fusion between the constituent fibers becomes insufficient, and the unevenness of the fiber web 50 is insufficiently fixed, while the temperature of the second heating fluid H2 is high. If it is too much, the texture of the nonwoven fabric becomes worse and it becomes difficult to produce bulk.

  The wind speed of the 2nd heating fluid H2 becomes like this. Preferably it is 1-10 m / sec, More preferably, it is 2-8 m / sec. If the wind speed of the second heating fluid H2 is too slow, the amount of heat is insufficient, so the strength of the nonwoven fabric becomes insufficient. On the other hand, if the wind speed is too fast, the constituent fibers are in a state where the thickness of the fiber web 50 is reduced by the wind pressure. The thickness is reduced due to heat fusion.

  The spraying time of the second heating fluid H2 is preferably 0.03 to 5 seconds, and more preferably 0.1 to 1 second. When the spraying time is too short, the constituent fibers of the fiber web 50 are not sufficiently fused to each other, and the unevenness of the fiber web 50 is insufficiently fixed. On the other hand, when the spraying time is too long, the constituent fibers of the fiber web 50 are formed. The heat fusion between the two proceeds excessively.

[Cooling process]
The cooling process is a process in which the cooling unit 160 cools the fiber web 50 that has been unevenly shaped through the first and second air-through processes. Cooling strengthens the thermal fusion point of the constituent fibers of the fiber web 50.
The cooling unit 160 is a space arranged between the second nozzle 130 and the third nozzle 140. This space naturally cools the fiber web 50 after the second air-through process. The cooling unit 160 may be provided with a cooling device that forcibly cools the fiber web 50. Examples of the forced cooling method include spraying of a cooling fluid from a cooling nozzle and contact with a cooling roller. The cooling temperature is preferably a temperature lower than the melting point of the heat-fusible fiber contained in the fiber web 50. When the thermoplastic fiber is a core-sheath type composite fiber, it is preferably lower than the melting point of the low-melting point component. Is also a low temperature. The cooling temperature is, for example, 100 ° C. or less.

[Third air-through process]
A 3rd air through process is a process of spraying the 3rd heating fluid H3 with the 3rd nozzle 140 with respect to the fiber web 50 which passed through the cooling process. By spraying the third heating fluid H3, the fluffed fibers and the non-fluffed fibers are thermally fused at a new fusion point, and a shaped nonwoven fabric without fluff is produced.

  The third nozzle 140 ejects the third heated fluid H3 from its ejection hole (not shown) and sprays it almost perpendicularly to the fiber web 50 on the conveyor belt 110.

  As the third heating fluid H3, air, water vapor or the like heated to a predetermined temperature by a third heater (not shown) provided in the third nozzle 140 is used. The third heating fluid H3 is heated by the third heater to a temperature at which the fuzzy fibers of the fiber web 50 and other constituent fibers are heat-sealed while the uneven shape of the fiber web 50 is maintained. When the fiber web 50 is a composite fiber having a low-melting-point component and a high-melting-point component having a higher melting point than the low-melting-point component, the third heating fluid H3 has a temperature from the melting point of the low-melting-point component to the melting point of the high-melting-point component. Be controlled. For example, when the fiber web 50 contains a core-sheath composite fiber whose sheath is PE and whose core component is PET, the temperature of the third heating fluid H3 is preferably 130 to 155 ° C., more preferably 130-145 ° C. If the temperature of the third heating fluid H3 is too low, the thermal fusion between the fibers becomes insufficient and the reduction of fuzz becomes insufficient. On the other hand, if the temperature of the third heating fluid H3 is too high, other than the fuzzy fibers These fibers are also fused, and the liquid permeability is lowered.

  The wind speed of the 3rd heating fluid H3 becomes like this. Preferably it is 0.5-5 m / sec, More preferably, it is 2-8 m / sec. If the wind speed of the third heating fluid H3 is too slow, the fluffy fibers cannot be laid down, and the reduction of the fluff becomes insufficient. On the other hand, if the wind speed is too fast, the thickness of the third heating fluid H3 is reduced with the wind pressure. Since heat fusion occurs between the fibers, the thickness is reduced, and the feel and liquid permeability are insufficient.

  The spraying time of the third heating fluid H3 is preferably 0.3 to 10 seconds, more preferably 2 to 6 seconds. If the spraying time is too short, the fuzzy fiber and other fibers cannot be sufficiently heat-sealed, and it becomes difficult to reduce the fuzz. On the other hand, if the spraying time is too long, fibers other than the fluffy fibers of the fiber web 50 are too fused together, the thickness becomes small, and it becomes difficult to obtain a texture and liquid permeability.

<Blood slipperiness agent>
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). 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 disclosure is used in contact with a human body, the vapor pressure is preferably about 0 to about 700 Pa at 40 ° C. (1 atm), and is about 0 to about 100 Pa. Is more preferably about 0 to about 10 Pa, still more preferably about 0 to about 1 Pa, and still more preferably about 0.0 to about 0.1 Pa. This is because if the vapor pressure of the blood slipperiness imparting agent is high, it may vaporize during storage, and problems such as reduction in the amount and odor during wearing may occur.

  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, 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.

The blood slipperiness-imparting agent may be applied alone to at least the convex portion 8 in the excretory opening contact region 20, or the blood slipperiness-imparting agent and at least one other component are contained. A blood slipping agent-containing composition may be applied.
Hereinafter, the blood slipping agent-containing composition will be described. In addition, since it is the same as that of the blood slipperiness | lubricity imparting agent about application of a blood slipperiness | lubricity imparting agent containing composition, description is abbreviate | omitted.

[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 other components are not particularly limited as long as they do not inhibit the effect of the blood slipperiness-imparting agent, and those conventionally used in absorbent articles, particularly top sheets, can be used in the industry. .

  Examples of other components include silicone oil, silicone, and silicone resin.

  Examples of other components include antioxidants such as BHT (2,6-di-t-butyl-p-cresol), BHA (butylated hydroxyanisole), and propyl gallate.

Examples of other components include vitamins such as natural vitamins and synthetic vitamins. Examples of vitamins include water-soluble vitamins such as vitamin B groups, such as vitamin B ₁ , vitamin B ₂ , vitamin B ₃ , vitamin B ₅ , vitamin B ₆ , vitamin B ₇ , vitamin B ₉ , vitamin B _12, etc. And vitamin C.

  Examples of vitamins include fat-soluble vitamins such as vitamin A group, vitamin D group, vitamin E group, and vitamin K group. Vitamins also include their derivatives.

  Examples of other components include amino acids such as alanine, arginine, lysine, histidine, proline, hydroxyproline, and peptides.

  Other components include, for example, zeolites such as natural zeolites such as fluorite, chabazite, pyroxenite, natrolite, zeolitic and somosonite, and synthetic zeolites.

  Examples of other components include cholesterol, hyaluronic acid, lecithin, ceramide and the like.

  Examples of other components include drugs such as skin astringents, anti-acne agents, anti-wrinkle agents, anti-cellulite agents, whitening agents, antibacterial agents, anti-fungal agents and the like.

  Examples of skin astringents include oil-soluble skin astringents such as zinc oxide, aluminum sulfate, and tannic acid, such as oil-soluble polyphenols. Examples of oil-soluble polyphenols include natural oil-soluble polyphenols, such as buckwheat extract, hypericum extract, nettle extract, chamomile extract, burdock extract, salvia extract, linden extract, scallop extract, birch extract, cedar extract, sage extract, salvia extract, Examples include teuchigurumi extract, hibiscus extract, loquat leaf extract, bodaiju extract, hop extract, marronnier extract, and yokuinin extract.

  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 other components include anti-inflammatory components, pH adjusters, antibacterial agents, moisturizers, fragrances, pigments, dyes, pigments, plant extracts and the like.

  Anti-inflammatory components include, for example, naturally-occurring anti-inflammatory agents such as buttons, ogon, hypericum, chamomile, licorice, momonoha, mugwort, perilla extract, synthetic anti-inflammatory agents such as allantoin, dipotassium glycyrrhizinate, etc. .

  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 60%, of the blood slipping agent and at least one other component, respectively. To about 99% and about 1 to about 40%, more preferably about 70 to about 99% and about 1 to about 30%, even more preferably about 80 to about 99% 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, 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 blood slipperiness-imparting agent and other components.

The blood slipping agent-containing composition preferably contains a surfactant in an amount equal to or less than the amount derived from the hydrophilic treatment of the top sheet or the second sheet. More specifically, the composition containing a blood slipperiness agent preferably 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. ² , more preferably about 0.1 to about 0.5 g / m ² , even more preferably 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 in an amount of 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 0.00. 1 to about 0.5 g / m ² , and even more preferably about 0.1 to about 0.3 g / m ^{2 in} the basis weight range. 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 ^2. More preferably, it has a kinematic viscosity of about 3 to about 60 mm < ² > / s, even more preferably about 5 to about 50 mm < ² > / s, Even more preferably, it has a kinematic viscosity of from 7 to about 45 mm ² / s.

When the kinematic viscosity of the composition containing a blood slipperiness agent exceeds about 80 mm ² / s, the viscosity is high, and the blood slipperiness imparting composition is an absorbent article together 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.

  If the composition containing a blood slipperiness agent contains at least one other component that is miscible with the blood slipperiness agent, the other component preferably has a weight average molecular weight of less than about 1,000. More preferably having 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-enhancing agent-containing composition itself has tackiness and tends to give the wearer discomfort. 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 composition containing a blood slipperiness imparting agent has a water retention of about 0.01 to about 4.0% by mass and a water retention of about 0.02 to about 3.5% by mass as the composition. Preferably about 0.03 to about 3.0 weight percent, more preferably about 0.04 to about 2.5 weight percent, and more preferably about 0.03 to about 3.0 weight percent More preferably, it has a water retention of 0.05 to about 2.0% by weight.

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. There is.
In addition, when a 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.

<Test Example 1>
The blood slipperiness imparting agents used in this test example 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 tetraerythritol tetra-2-ethylhexanoate and neopentyl glycol di-2-ethylhexanoate (58:42, weight 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 containing approximately 37: 7: 56 weight ratio, glycerol and fatty acid triester, Weight average molecular weight: about 570
Tri-CL oil fatty acid glyceride, manufactured by NOF Corporation C ₈ fatty acid: Triester of glycerin and fatty acid containing fatty acid of C ₁₂ in a weight ratio of about 44:56, 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) fatty acids to C ₂₀ is approximately 5: contained in 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 weight 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
A monoester of glycerin and a fatty acid, containing (caprylic acid / capric acid) monoglyceride, NOF Corporation octanoic acid (C ₈ ) and decanoic acid (C ₁₀ ) in a weight ratio of approximately 85:15, 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
・ Vaseline, manufactured by Cognis Japan Co., Ltd. Petroleum-derived hydrocarbon, semi-solid

<Test Example 2>
[A surface residual rate A of menstrual blood when a large amount of blood is absorbed]
An experiment was conducted to evaluate the absorbability when a sanitary napkin absorbed a large amount of blood at one time.
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 0.00 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 coated with 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. 1-1 was formed.

The blood slipperiness-imparting agent was changed from Unistar H-408BRS to that shown in Table 2, and sanitary napkin no. 1-2-No. 1-49 was produced. When the blood slipperiness-imparting agent is a liquid at room temperature, and when the blood slipperiness-imparting agent is a solid at room temperature, it is heated to the melting point + 20 ° C., and then a control seam HMA gun is used. Then, 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 applied to the substantially whole surface of the skin contact surface of a top sheet, and to both a collar part and a groove part.

[Test method]
Mass of top sheet: After measuring W ₂ (g) (mass of top sheet before test), an acrylic plate having a hole in the center of the absorbent article in the longitudinal direction and width direction 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, and its mass: W ₃ (g) (the mass of the top sheet after the test) is measured. (Mass%) "was calculated.
Surface residual rate A (mass%)
= 100 × [W ₃ (g) −W ₂ (g)] / 4.0 (g)

Further, the tackiness of the skin contact surface of the top sheet was measured at 35 ° C. according to the following criteria.
○: No tackiness △: Some tackiness is present ×: There is tackiness

  Table 2 below shows the surface residual ratio A, tackiness, and characteristics of each blood slipperiness imparting agent of each absorbent article. FIG. 7 shows an electron micrograph of the skin contact surface of the top sheet in a sanitary napkin where the top sheet contains tri-C2L oil fatty acid glycerides.

  A sanitary napkin No. having no blood slipperiness imparting agent. In No. 1-49, the surface residual ratio A was 7.5% by mass, but the sanitary napkin No. 1 having a kinematic viscosity and a water retention rate within the predetermined ranges was used. 1-1-No. In 1-21, the surface residual rate A was 2.5 mass% or less.

  Sanitary napkin no. 1-1-No. In 1-21, 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 sanitary napkin No. 1-49 having no blood slipperiness-imparting agent, the dropped equine EDTA blood does not slide down into the groove but slowly hangs down into the groove, and most of it is the buttocks of the top sheet Remained. Further, in an absorbent article having a high water retention rate, for example, No. 1-30, the equine EDTA blood dropped on the buttocks of the top sheet does not slide down to the groove, but partially remains in the top sheet. Slowly dropped and some remained in the buttocks.

  From the above, the sanitary napkin No. 1-1-No. 1-21 suggests that menstrual blood can be rapidly transferred from the top sheet to the absorber when a large amount of menstrual blood reaches the top sheet at one time.

  Next, no. When a plurality of volunteer subjects wore sanitary napkins 1-1 to 1-49, no. In the sanitary napkin containing the blood slipping agent of 1-1 to 1-21, the top sheet is not sticky even after menstrual blood is absorbed, and there are many responses that the top sheet is smooth. It was.

<Test Example 3>
[Surface remaining rate B of menstrual blood when a small amount of blood is absorbed]
An experiment was conducted to evaluate the absorbability when a sanitary napkin absorbed a small amount of blood.
An air-through nonwoven fabric treated with a hydrophilic agent (a composite fiber composed of polyester and polyethylene terephthalate, basis weight: 35 g / m ² ) and a top sheet (hereinafter sometimes referred to as “top sheet having a ridge”) , Second sheet formed from air-through nonwoven fabric (composite fiber made of polyester and polyethylene terephthalate, basis weight: 30 g / m ² ), pulp (basis weight: 150 to 450 g / m ² , more in the center), acrylic high An absorbent body including an absorbent polymer (basis weight: 15 g / m ² ) and a tissue as a core wrap, a water repellent-treated side sheet, 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 0.00 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 coated with 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 (i) was formed.

A top sheet made of a flat, air-through nonwoven fabric (composite fiber made of polyester and polyethylene terephthalate, basis weight: 35 g / m ² ) that has no groove structure and is treated with a hydrophilic agent (hereinafter referred to as “flat”) The sanitary napkin No. 4 was changed to “No. In the same manner as in 2-1 (i), the sanitary napkin No. 2-1 (ii) was formed.

The blood slipperiness-imparting agent was changed from Unistar H-408BRS to that shown in Table 3, and sanitary napkin no. 2-2 (i) -No. 2-11 (i) and No. 2-11. 2-2 (ii) -No. 2-11 (ii) was produced. When the blood slipperiness-imparting agent is a liquid at room temperature, and when the blood slipperiness-imparting agent is a solid at room temperature, it is heated to the melting point + 20 ° C., and then a control seam HMA gun is used. Then, 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 both the ridge part and a groove part in the substantially whole surface of the skin contact surface of a top sheet, and the top sheet which has a ridge groove structure.

[Test method]
Weight of top sheet: W ₄ (g) (mass of top sheet before test) was measured, and then the horse EDTA blood at 37 ± 1 ° C. was placed on the center top sheet in the longitudinal direction and width direction of the absorbent article. About 0.25 g (2 drops) was dropped from the pipette. In the top sheet having the groin, equine EDTA blood was dropped on the top of the buttock.

30 seconds after dropping, the top sheet was taken out, its mass: W ₅ (g) (the mass of the top sheet after the test) was measured, and “surface residual ratio B (mass%)” was calculated according to the following formula. .
Surface residual rate B (mass%)
= 100 × (W ₅ (g) −W ₄ (g)) / W ₆ (g)
W ₆ (g) is the mass of the equine EDTA blood that was dripped, calculated from the mass of the pipette before and after the dripping.
The results are shown in Table 3 below.

  From Table 3, when the blood slipperiness-imparting agent is H-408BRS, Panacet 810S, Capric acid diglyceride, Compol BL, O-acetyltributyl citrate, Dioctyl adipate, Electol WE40, Uniol PB500, and Pearl Ream 6 Shows that the surface residual ratio B is low in the top sheet having the ridges. This seems to suggest that the blood slipperiness-imparting agent having the predetermined characteristics quickly transferred a small amount of blood from the groin to the groove and the absorber.

<Test Example 4>
[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 disclosure has an action of lowering the viscosity of blood such as menstrual blood in a low viscosity region. 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 5>
[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 photomicrograph of menstrual blood containing no blood slipping agent is shown in FIG. 8 (a), and a photomicrograph of menstrual blood containing panacet 810s is shown in FIG. 8 (b).

  From FIG. 8, 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 6>
[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. 9).

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.

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 8 Convex part 9 Concave part

Claims (14)

Absorption comprising a liquid-permeable top sheet having a skin contact surface, a liquid-impermeable back sheet having a non-skin contact surface, and an absorber provided between the top sheet and the back sheet A sex product,
The skin contact surface side where the top sheet is alternately arranged in the first direction and the second direction intersecting the first direction at least in the excretory opening contact region of the skin contact surface. A plurality of protrusions protruding to the absorber, and a plurality of recesses recessed to the absorber side,
Each of the plurality of convex portions has a top portion and a convex portion side wall portion extending from the top portion,
Each of the plurality of recesses has a bottom part and a recess side wall part extending from the bottom part,
The convex side wall portion has a fiber orientation along the extending direction,
The concave side wall has fiber orientation along the extending direction,
At least the convex portion in the excretory opening contact region has a kinematic viscosity at 40 ° C. of 0.01 to 80 mm ² / s, a water retention of 0.01 to 4.0% by mass, a weight average molecular weight of 1, The said absorbent article with which the blood slipperiness | lubricity imparting agent which is less than 000 is coated.   The absorptive article according to claim 1 whose fiber density of the top part of said convex part is lower than the fiber density of the bottom part of said crevice.   The absorbent article of Claim 1 whose fiber density of the top part of the said convex part is higher than the fiber density of the bottom part of the said recessed part.   The absorptive article according to any one of claims 1 to 3 in which said convex part side wall part and / or said crevice side wall part have a portion from which fiber orientation differs.   The absorbent article according to any one of claims 1 to 4, wherein the fiber orientation in the thickness direction at the bottom of the recess is smaller than the fiber orientation in the thickness direction at the sidewall of the recess.   The absorbent article according to any one of claims 1 to 5, wherein the number of fiber fusion points at the top of the convex portion is smaller than the number of fiber fusion points at the bottom of the concave portion.   The absorbent article according to any one of claims 1 to 6, wherein the constituent fibers of the top sheet are heat-sealed.   The absorptive article according to any one of claims 1 to 7 in which said top sheet contains heat extensibility fiber which carried out heat extension.   The absorbent article of any one of Claims 1-8 whose IOB of the said blood slipperiness | lubricity imparting agent is IOB of 0.00-0.60. 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 9. 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 10. 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 11, which 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 12, which is selected from the group consisting of :) chain alkanes, and any combination thereof.   The absorbent article according to any one of claims 1 to 13, wherein the blood slipperiness-imparting agent has a vapor pressure of 0.00 to 0.01 Pa at 1 atm and 40 ° C.