JP5726123B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, disposable diapers, incontinence pads, and incontinence liners.

  A general absorbent article includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body provided between the top sheet and the back sheet. Is absorbed and held by the absorber. And the device which prevents that the absorber is compressed too much at the time of a deformation | transformation of an absorbent article, and the liquid absorbed and hold | maintained at the absorber reversely leaks out from a top sheet (rewetting) is calculated | required.

  As one of such contrivances, the top sheet has a plurality of slits that are substantially closed when the top sheet is in a non-tension state and that extend through the top sheet and open when the top sheet is under tension. It has been proposed to form (Patent Document 1).

  However, when the absorbent article described in Patent Document 1 absorbs the user's liquid excrement and receives tension while being worn by the user, the slit formed in the top sheet opens. The absorber is exposed, the exposed absorber contacts the user's skin, and the user feels sticky and uncomfortable.

JP-T-2002-528174

  An object of this invention is to provide the novel absorbent article which prevents the excessive compression of the absorber resulting from a deformation | transformation of an absorbent article, and the accompanying rewet.

  In order to solve the above problems, the present invention provides an absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body provided between the liquid-permeable sheet and the liquid-impermeable sheet. In the liquid permeable sheet, the liquid supply region that receives the supply of the liquid is formed with an extensible region having an expandable bellows portion and a flexible region surrounding the extensible region. An absorbent article is provided.

When the absorbent article of the present invention is bent in the liquid supply area of the liquid permeable sheet and deformed in a convex shape toward the liquid supply area, the extensible area of the liquid supply area expands, so that the absorbent body However, it becomes difficult to receive the pressure by the liquid supply area. Therefore, excessive compression of the absorbent body due to deformation of the absorbent article and accompanying rewet are prevented.
Further, when the absorbent article of the present invention is deformed while changing the angle at which the absorbent article is bent (for example, when the absorbent article wearer changes the posture, the angle at which the absorbent article is bent becomes an acute angle or an obtuse angle. The liquid permeable sheet easily follows the deformation of the absorbent article due to the elastic restoring force (repulsive force) of the flexible region, so that the liquid permeable sheet bends due to the extension of the extensible region. In addition, sticking of the bent sheet to the skin is prevented.

  ADVANTAGE OF THE INVENTION According to this invention, the novel absorbent article which prevents the excessive compression of the absorber resulting from a deformation | transformation of an absorbent article, and the accompanying rewet is provided.

FIG. 1 is a plan view of a sanitary napkin according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing a cross section taken along line AA of FIG. FIG. 3 is a partially broken perspective view showing, in an enlarged manner, the extensible region and the flexible region of the top sheet in the sanitary napkin according to the embodiment of the present invention. FIG. 4 is a perspective view when a sanitary napkin according to an embodiment of the present invention is deformed in a convex shape. Drawing 5 is a figure for explaining the manufacturing method of the sanitary napkin concerning one embodiment of the present invention. Drawing 6 is a figure for explaining a crevice formation roll used for manufacture of a sanitary napkin concerning one embodiment of the present invention. FIG. 7 is a view for explaining a region of the top sheet in which the concave portion is formed by the concave portion forming roll. Drawing 8 is a figure for explaining the upper stage roll of the extension gear roll used for manufacture of the sanitary napkin concerning one embodiment of the present invention. FIG. 9 is a view for explaining a lower roll of a stretched gear roll used for manufacturing a sanitary napkin according to an embodiment of the present invention. FIG. 10 is a view for explaining a top sheet stretched by a stretched gear roll. FIG. 11 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. 12 is a photomicrograph of menstrual blood with or without a blood modifying agent. FIG. 13 is a diagram for explaining a method of measuring surface tension.

Hereinafter, the absorbent article of the present invention will be described.
In the absorbent article of the present invention, the liquid supply area is an area appropriately set in the liquid permeable sheet according to the type and application of the absorbent article, and the liquid supply area set in the liquid permeable sheet. The position and area of the region are not particularly limited. The liquid supply area may be set as an area substantially the same as the area where the liquid is actually supplied, or may be set as a larger area, but prevents the liquid from leaking to the outside. In view of this, it is preferable to set the region larger than the region where the liquid is actually supplied.

  In the absorbent article of the present invention, the stretchable region is a region that can be stretched by stretching the bellows part. The bellows portion has a repeated structure of a mountain fold portion and a valley fold portion, and can be stretched in the surface direction of the stretchable region. The bellows portion may have contractility in addition to stretchability. However, even if the bellows portion is contractible, depending on the material of the bellows portion, the number of bellows, etc., the bellows portion is not completely contracted to the original state and is slightly expanded from the original state. May be maintained.

  In the absorbent article of the present invention, the flexible region is a region having an elastic restoring force (repulsive force) against deformation. The flexible region may be expanded by a force applied at the time of deformation, but it is preferable that the flexible region is not substantially expanded by a force applied at the time of deformation from the viewpoint of increasing an elastic restoring force against the deformation.

  In the absorbent article of the present invention, the flexible region surrounds the entire circumference or a part of the extensible region. It is possible from the point that when the absorbent article is deformed in a convex shape, the stretchable region that prevents excessive compression of the absorbent body and the elastic restoring force of the flexible region that prevents the liquid-permeable sheet from bending are effectively generated. The flexible region preferably surrounds 30 to 100% of the entire circumference of the stretchable region, more preferably 50 to 100%, and most preferably 100%.

  In the absorbent article of the present invention, it is preferable that a plurality of stretchable regions having stretchable bellows portions are formed in the liquid supply region, and the flexible region surrounds each stretchable region (aspect) 1). In the first aspect, when the absorbent article is convexly deformed, the elastic restoring force of the flexible region that prevents the stretch of the stretchable region that prevents excessive compression of the absorbent body and the deflection of the liquid-permeable sheet is effectively generated.

  In aspect 1, it is preferable that the flexible region is formed in a mesh shape, and an extensible region is formed inside each mesh (aspect 2). In aspect 2, at the time of the convex deformation of the absorbent article, the elastic restoring force of the flexible region that prevents the stretch of the stretchable region that prevents over-compression of the absorbent body and the deflection of the liquid-permeable sheet is effectively generated. In addition, a plurality of extensible areas and a flexible area surrounding each extensible area are arranged.

  In aspect 2, the flexible region extends in a direction intersecting with the longitudinal direction of the absorbent article, and a substantially linear first region arranged in parallel with each other, and a direction intersecting the first region It is preferable to have a substantially linear second region extending in parallel with each other and arranged substantially in parallel (mode 3). In aspect 3, at the time of the convex deformation of the absorbent article, an elastic restoring force of the flexible region that prevents the stretch of the stretchable region that prevents excessive compression of the absorbent body and the deflection of the liquid-permeable sheet is effectively generated. In addition, a mesh-like flexible region is arranged.

  In the absorbent article of the present invention, the bellows portion extends in the longitudinal direction of the absorbent article, is juxtaposed in the width direction of the absorbent article, and the mountain fold portion and the valley fold whose cross section along the width direction is wavy It is preferable to have a part (Aspect 4). In aspect 4, when the absorbent article is bent along the longitudinal direction and deformed in a convex shape toward the liquid supply region side, the bellows portion expands in the width direction of the absorbent article. The resulting excessive compression of the absorbent body and associated rewet are effectively prevented.

  In the absorbent article of the present invention, it is preferable that the liquid permeation hole is formed in the extensible region and the liquid permeation hole is not formed in the flexible region (Aspect 5). In the aspect 5, when the absorbent article is convexly deformed, the liquid permeable hole is formed in the extensible region where the tension is not directly applied, whereas the liquid permeable hole is not formed in the flexible region where the tension is directly applied. The liquid permeation hole is stretched by tension, and the absorber is prevented from being exposed.

  In the absorbent article of the present invention, it is preferable that a squeezing groove is formed in the peripheral portion of the liquid supply region (Aspect 6). A pressing groove is a recessed part formed by compressing and integrating the peripheral part of a liquid supply area | region and an absorber. In the aspect 6, since the absorbent article is easily and stably deformed in a convex shape starting from the compressed groove, the stretch of the stretchable region and the liquid permeability are prevented when the absorbent article is deformed in a convex shape. The elastic restoring force of the flexible region that prevents the sheet from bending is effectively generated.

  In the absorbent article of the present invention, the liquid permeable sheet has an IOB of 0.00 to 0.60, a melting point of 45 ° C. or less, and a water solubility of 0.00 to 0.05 g with respect to 100 g of water at 25 ° C. It is preferable that the blood modifying agent which has this is included (aspect 7). In the aspect 7, when the absorption target of the absorbent article is menstrual blood, the menstrual blood that has reached the liquid permeable sheet is reformed in contact with the blood modifying agent. Blood hardly remains, the sticky feeling of the liquid-permeable sheet is reduced, the smooth feeling is improved, and the wearer is less likely to visually feel discomfort.

In aspect 7, the blood modifying agent is, for example, the following (i) to (iii):
(I) hydrocarbons;
(Ii) from (ii-1) a hydrocarbon moiety and (ii-2) a carbonyl group (—CO—) and an oxy group (—O—) inserted between the C—C single bonds of the hydrocarbon moiety. A compound having one or more identical or different groups selected from the group consisting of: and (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 (Aspect 8).

In Aspect 7 or 8, the blood modifying agent is, for example, the following (i ′) to (iii ′):
(I ′) a 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-) selected from the group consisting of 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 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 more 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, the bonds are not adjacent (Aspect 9).

In Aspects 7 to 9, the blood modifying agent is, for example, 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 that replaces 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 _{2 ~ 6} alkylene glycol or its alkyl ester or alkyl ether; and (F) a chain hydrocarbons;
As well as selected from the group consisting of any combination thereof (Aspect 10).

In embodiments 7 to 10, the blood modifying agent is, for example, (a ₁ ) an ester of a chain hydrocarbon tetraol and at least one fatty acid, or (a ₂ ) an ester of a chain hydrocarbon triol and at least one fatty acid. , (A ₃ ) an ester of a chain hydrocarbon diol and at least one fatty acid, (b ₁ ) an ether of a chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol, (b ₂ ) a chain hydrocarbon Ether of triol and at least one aliphatic monohydric alcohol, (b ₃ ) ether of chain hydrocarbon diol and at least one aliphatic monohydric alcohol, (c ₁ ) chain carbonization having four carboxyl groups hydrogen tetracarboxylic acid, hydroxy acids, esters of alkoxy acids or oxoacids, and at least one aliphatic monohydric alcohol, (c ₂₎ 3 carboxyl groups Chain hydrocarbon tricarboxylic acid, hydroxy acids having, 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 An ester of an alkoxy acid or an oxo acid with 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 ) esters of fatty acids and aliphatic monohydric alcohols, (d ₄₎ dialkyl carbonate, (e ₁₎ polyoxy C _{2 ~ 6} alkylene glycol, (e ₂₎ an ester of a polyoxy C _{2 ~ 6} alkylene glycol and at least one fatty acid, (e ₃₎ polyoxy C _{2 ~ 6} alkylene glycol and at least one aliphatic monohydric ethers of alcohols, e ₄₎ polyoxy C _{2 ~ 6} alkylene glycol, an ester of a chain hydrocarbon tetracarboxylic acid, chain hydrocarbon tricarboxylic acid or chain hydrocarbon dicarboxylic acid, and (e ₅₎ polyoxy C _{2 ~ 6} alkylene glycol , A chain hydrocarbon tetraol, a chain hydrocarbon triol, or an ether with a chain hydrocarbon diol, and (f ₁ ) a chain alkane, and any combination thereof (Aspect 11) .

  In the absorbent article of the present invention, two or more aspects among the aspects 1 to 11 may be combined.

The type and application of the absorbent article of the present invention are not particularly limited. These may include humans, and may also target non-human animals such as pets. The liquid which an absorptive article makes absorption object is not specifically limited, For example, a user's liquid excrement, body fluid, etc. are mentioned.
Hereinafter, an embodiment of the absorbent article of the present invention will be described using a sanitary napkin as an example.

<First Embodiment>
As shown in FIGS. 1 and 2, the sanitary napkin 1 according to the first embodiment includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and between the top sheet 2 and the back sheet 3. And an absorber 4 provided on the surface.

  In FIG. 1, the X-axis direction is the width direction of the sanitary napkin 1, the Y-axis direction is the longitudinal direction of the sanitary napkin 1, and the plane direction extending along the X-axis Y-axis is the plane direction of the sanitary napkin 1. Equivalent to. The same applies to the other drawings. FIG. 2 is a schematic cross-sectional view, and the bellows portion 210 formed on the top sheet 2 is omitted.

  The sanitary napkin 1 is worn by the user for the purpose of absorbing liquid excretion (particularly menstrual blood). At this time, the user wears the top sheet 2 on the user's skin side and the back sheet 3 on the user's clothes (underwear) side. Liquid excreta penetrates into the absorbent body 4 through the top sheet 2 and is absorbed and held by the absorbent body 4. Leakage of liquid excreta absorbed by the absorber 4 is prevented by the back sheet 3.

  As shown in FIGS. 1 and 2, the top sheet 2 and the back sheet 3 have end portions in the longitudinal direction joined together by seal portions 7 a and 7 b to form a main body portion 11, and end portions in the width direction are aligned with each other. The substantially rectangular wing parts 12a and 12b which are joined by the seal parts 8a and 8b and extend from the main body part 11 in the width direction are formed. The peripheral portions of the top sheet 2 and the back sheet 3 are joined by the seal portions 7 a, 7 b, 8 a, 8 b, thereby preventing separation of both sheets when the sanitary napkin 1 is deformed.

  The shape of the main body 11 can be appropriately changed within a range suitable for a female body, underwear, and the like, and may be, for example, a substantially rectangular shape, a substantially oval shape, a substantially saddle shape, or the like. The total length in the longitudinal direction of the main body 11 is preferably 100 to 500 mm, more preferably 150 to 350 mm, and the total length in the width direction of the main body 11 is preferably 30 to 200 mm, more preferably 40 to 180 mm. is there.

  Examples of the bonding mode by the seal portions 7a, 7b, 8a, and 8b 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).

  Examples of the embossing include a method of embossing by passing the top sheet 2 and the back sheet 3 together between a patterned embossing roll and a flat roll (a method called a so-called round seal). . 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. The embossed pattern is preferably intermittently elongated so that the sanitary napkin 1 is not easily bent at the boundary of the seal portion.

  As the hot melt adhesive, for example, styrene-ethylene-butadiene-styrene (SEBS), styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS), or 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). Specific examples of the method for applying the adhesive include spiral coating, coater coating, curtain coater coating, summit gun coating, and the like.

  As shown in FIG. 2, adhesive portions 9 a and 9 b are provided on the clothing side of the backsheet 3 that forms the wing portions 12 a and 12 b, and on the clothing side of the backsheet 3 that forms the main body portion 11, An adhesive portion 9c is provided. The sanitary napkin 1 is obtained by attaching the adhesive portion 9c to the crotch portion of the underwear, bending the wing portions 12a and 12b to the outer surface side of the underwear, and attaching the adhesive portions 9a and 9b to the crotch portion of the underwear. Stablely fixed to underwear.

  Examples of the adhesive contained in the adhesive portions 9a, 9b, and 9c include 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; trifresyl 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 provided on the surface that comes into contact with the user's skin for the purpose of improving the touch when the user wears the sanitary napkin 1.

  As shown in FIGS. 1 and 2, the top sheet 2 is provided with a waste supply area 20 for receiving liquid waste from a user. The excrement supply area 20 includes an excretion opening contact area 20a in which a user's excretion opening (for example, a small labia, a large labia, etc.) comes into contact, and a surrounding area 20b positioned around the excretion opening contact area 20a. The length of the excreta supply area 20 is usually 50 to 200 mm, preferably 70 to 150 mm, and the width is usually 10 to 80 mm, preferably 20 to 50 mm. The excretion opening contact area 20a is wider than the area where the user's excretion opening actually contacts in order to improve the absorbability of the liquid excretion. The surrounding area 20b is arranged around the excretion opening contact area 20a in order to prevent leakage of liquid excretion that has not been absorbed from the excretion opening contact area 20a. The surrounding area 20b effectively prevents leakage of the liquid excrement that has not been absorbed from the excretory opening contact area 20a, particularly from the width direction of the sanitary napkin 1.

  The top sheet 2 is made of a flexible material. The flexible material is a material having an elastic restoring force (repulsive force) against deformation. The flexible material may be stretched by a force applied at the time of deformation, but it is preferable that the flexible material is not substantially stretched by a force applied at the time of deformation from the viewpoint of increasing an elastic restoring force against the deformation.

  Examples of the flexible material include a synthetic resin. Examples of the synthetic resin include a copolymer of an olefin and another monomer such as an acrylate ester and vinyl acetate; a low density polyethylene and a linear low density polyethylene. , Polyolefins such as high-density polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides; cellulose acetate and the like. Among these, copolymers of olefins and other monomers because of their high flexibility and low irritation to the skin. Polyolefin and the like are preferable. The flexible material is a mixed material of two or more kinds of synthetic resins, for example, a mixed material of 20-60% low density polyethylene, 30-60% linear low density polyethylene, and 5-20% high density polyethylene. Also good.

  As shown in FIG.1 and FIG.3, the flexible area | region 22 is formed in the mesh shape at substantially the whole including the excrement supply area | region 20 among the top sheets 2, and it is extensible inside each mesh | network. Region 21 is formed. The stretchable region 21 has stretchability due to the stretch of the bellows part 210, and the flexible region 22 is flexible (elastic restoring force against deformation) due to the flexible material constituting the topsheet 2. Have As shown in FIG. 3, the flexible region 22 is substantially flat and does not have extensibility due to the structure like the extensible region 21.

  As shown in FIG. 3, the stretchable region 21 is formed with a bellows portion 210 having a repeated structure of a mountain fold portion and a valley fold portion. The stretchable region 21 can be stretched in the surface direction of the stretchable region 21 by stretching the mountain fold portion and the valley fold portion of the bellows portion 210. In FIG. 3, when the top sheet 2 side is the upper side and the back sheet 3 side is the lower side, the convex portion on the upper side is the mountain fold portion, and the convex portion on the lower side is the valley fold portion. .

  As shown in FIGS. 1 and 3, the mountain fold portion and the valley fold portion of the bellows portion 210 extend in the longitudinal direction of the sanitary napkin 1 and are juxtaposed in the width direction of the sanitary napkin 1. . With such an arrangement, when the sanitary napkin 1 is bent along the longitudinal direction and is convexly deformed toward the top sheet 2 side, the bellows part 210 is prevented from being excessively compressed (the sanitary napkin). 1 in the width direction) effectively occurs.

  As shown in FIG. 3, the cross section of the bellows portion 210 along the width direction of the sanitary napkin 1 is substantially wave-shaped. The substantially wave shape includes a shape in which a U-shaped curve is changed to a straight line, a U-shape is changed to a U-shape, a U-shape is changed to a V-shape, and the like.

  The width of the top of the mountain fold and the width of the bottom of the valley fold are usually 0.1 to 2.0 mm, preferably 0.2 to 1.5 mm. The height of the mountain fold and the valley fold The depth is usually 0.3 to 3.0 mm, preferably 0.5 to 1.5 mm, and the width between the uppermost portions of the adjacent mountain fold portions and the width between the lowermost portions of the adjacent valley fold portions are The thickness is usually 0.3 to 3.0 mm, preferably 0.5 to 2.0 mm.

  The bellows part 210 may have contractility in addition to stretchability. However, even if the bellows part 210 has contractibility, the stretched bellows part 210 does not completely contract to the original state depending on the material of the bellows part 210, the number of bellows, etc. There is a case where the state slightly stretched than the state is maintained.

  When constriction is imparted to the bellows part 210, an elastomer material may be mixed with the flexible material constituting the top sheet 2. Examples of the elastomer include polyester-based, urethane-based, olefin-based, styrene-based, and polyamide-based thermoplastic elastomers, low-density polyethylene using a metallocene catalyst, ethylene-α-olefin copolymer, and combinations thereof.

  Examples of the polyester-based elastomer include those containing an aromatic polyester as a hard segment, amorphous polyether, aliphatic polyester, etc. as a soft segment, and examples of the urethane-based elastomer include, for example, a thermoplastic elastomer, Polyurethanes composed of polyester, low molecular glycol, methylene bisphenyl isocyanate, etc. are mentioned. Examples of olefin elastomers include random copolymers of ethylene and α-olefins, and random copolymers of ethylene, α-olefins and dienes. Examples of the styrene-based elastomer include block copolymers such as SEBS, SIS, SEPS, and SBS. Examples of the polyamide-based elastomer include a hard segment as a hard segment. The thing containing nylon and the polyester or polyol as a soft segment is mentioned.

As shown in FIGS. 1 and 3, the flexible region 22 extends in a direction crossing the longitudinal direction of the sanitary napkin 1, and is a substantially linear m number of regions (hereinafter referred to as “parallel”). "Region A1 _-m ") and n substantially linear regions (hereinafter referred to as "Region B1 _-n ") extending in a direction intersecting with the region A1 _-m and arranged substantially in parallel. ), And the region A _1-m and the region B _1-n intersect to form a mesh shape.

The angle α _{1 at which the} region A _1-m intersects the longitudinal direction of the sanitary napkin 1 is usually 1 ° ≦ α ₁ ≦ 90 °, preferably 10 ° ≦ α ₁ ≦ 80 °, more preferably 30 ° ≦ α _1. ≦ 60 °. Region B _1-n intersects the longitudinal direction of the sanitary napkin 1 the angle alpha ₂ (where the angle region B _1-n crosses the area A _1-m and alpha ₁ + alpha ₂₎ is usually 1 ° ≦ α ₂ ≦ 90 °, preferably 10 ° ≦ α ₂ ≦ 80 °, more preferably 30 ° ≦ α ₂ ≦ 60 °. However, α ₁ and α ₂ are selected so that α ₁ + α ₂ does not become 180 °. When α ₁ and α ₂ are within the above range, the region A _1-m and the region B _1-n are located on both sides of the longitudinal direction of the sanitary napkin 1, so that the sanitary napkin 1 is along the longitudinal direction. When it is bent and convexly deformed, the repulsive force (restoring force) of the flexible region 22 against the convex deformation is easily exhibited, and the dimensions of each mesh necessary for forming the bellows portion 210 of the extensible region 21 Is secured.

The number (m) of the regions A _{1-m and} the number (n) of the regions B _1-n are not limited to the numbers shown in FIG. m and n are the same or different numerical values, and the numerical range of m and n is usually 4 to 60, preferably 8 to 40, and more preferably 10 to 35.

The width of each region of the region A _1-m and the region B _1-n is usually 0.1 to 5 mm, preferably 0.3 to 3 mm, and more preferably 0.5 to 2 mm. When the widths of the region A _1-m and the region B _1-n are in the above range, the repulsive force (restoring force) of the flexible region 22 against the convex deformation is easily exhibited, and the bellows portion of the extensible region 21 The dimensions of each mesh necessary for forming 210 are secured.

As shown in FIGS. 1 and 3, the shape of each mesh formed by the intersection of the region A _1-m and the region B _1-n is a substantially rhombus shape. By changing the present embodiment, the shape of each mesh may be a substantially polygonal shape such as a substantially triangular shape, a substantially rectangular shape, or a substantially pentagonal shape. The substantially polygonal shape includes a shape to which a corner is rounded or a straight line constituting one side is curved. Further, the first embodiment and the second region may be curved, and the shape of each mesh may be a substantially circular shape, a substantially elliptical shape, or the like by modifying the present embodiment.

  The size of each mesh in the longitudinal direction and the width direction of the sanitary napkin 1 is usually 3 to 40 mm, preferably 5 to 30 mm, and more preferably 10 to 20 mm. When the size of each mesh is in the above range, the repulsive force (restoring force) of the flexible region 22 against the convex deformation is easily exhibited, and each mesh necessary for forming the bellows portion 210 of the extensible region 21 is provided. The dimensions are secured.

  The total number of mountain folds and valley folds formed in each mesh is usually 3 or more, preferably 5 to 19, and more preferably 7 to 15. However, the total number of mountain folds and valley folds is an odd number. When the total number of the mountain folds and the valley folds of the bellows part 210 is in the above range, when the sanitary napkin 1 is deformed in a convex shape, the bellows part 210 that prevents excessive compression of the absorbent body 4 is effectively stretched. Arise.

  As shown in FIGS. 1 and 3, the flexible region 22 surrounds the entire periphery of the stretchable region 21, and the connection between adjacent stretchable regions is blocked by the flexible region 22. By changing the present embodiment, a part of the periphery of the extensible region 21 may be surrounded by the flexible region 22. In this case, when the sanitary napkin 1 is convexly deformed, the elastic restoring force of the flexible region 22 that prevents the bellows portion 210 that prevents the absorber 4 from being excessively compressed and the top sheet 2 from bending is effectively generated. In view of this, the flexible region 22 preferably surrounds 30% or more of the entire circumference of the stretchable region, and more preferably surrounds 50% or more.

  As shown in FIGS. 1 and 3, the flexible region 22 is continuous with the peripheral portion of the extensible region 21. As shown in FIG. 3, the flexible region 22 is continuous with the uppermost portion of the mountain fold portion of the bellows portion 210. By changing the present embodiment, the flexible region 22 may be continuous with the lowermost portion of the valley fold portion of the bellows portion 210. However, since the touch of the top sheet 2 is smooth when the flexible region 22 is on the skin surface side, the flexible region 22 is the uppermost part of the mountain fold portion of the bellows portion 210 as shown in FIG. It is preferable that it is continuous.

  As shown in FIG. 3, the top sheet 2 is formed with a plurality of liquid permeation holes 26, and the liquid excretion can permeate the absorber 4 through the liquid permeation holes 26. As shown in FIG. 3, the liquid permeation hole 26 is an extensible region 21 in the excrement supply region 20 of the top sheet 2 where tension is not directly applied during convex deformation ( It is formed on the side surface 25) that connects the upper part and the lowermost part of the valley fold, but is not formed in the flexible region 22 to which tension is directly applied during convex deformation. Therefore, it is difficult for the liquid permeation hole 26 to be stretched due to the tension, and the absorber 4 that has absorbed the liquid excreta is exposed to come into contact with the user's skin, thereby preventing the user from feeling sticky and uncomfortable.

The opening area of one of the liquid passage holes 26 are preferably 0.001～1Mm ^2, more preferably 0.01 to 0.1 mm ^2. When the opening area of one liquid permeation hole 26 is smaller than 0.001 mm ² , the liquid excretion may be difficult to permeate, and when it exceeds 1 mm ² , the liquid excrement once absorbed by the absorber 4 In some cases, the liquid reverses through the liquid permeation hole 26, or the concealability of the top sheet 2 may be reduced.

  The ratio of the total opening area to the area of the top sheet 2, that is, the opening ratio of the top sheet 2 is preferably 5 to 20%. If the opening ratio of the top sheet 2 is less than 5%, the permeability of liquid excrement in the top sheet 2 may be deteriorated. If the opening ratio of the top sheet 2 exceeds 20%, the absorbent body 4 absorbs it once. In some cases, the body fluid that has flown back through the liquid permeation hole 26 or the liquid excretion absorbed by the absorber 4 through the liquid permeation hole 26 may be seen.

The thickness, basis weight, and the like of the top sheet 2 are adjusted as appropriate from the viewpoint of the formability of the bellows portion 210 of the stretchable region 21 and the flexibility of the flexible region 22. The basis weight of the top sheet 2 is usually 10 g / m ² or more (for example, 10 to 40 g / m ² ), preferably 20 to 30 g / m ² , and the thickness of the top sheet 2 is usually 0.01 to 3. 0 mm, preferably 0.1 to 1.5 mm.

  From the viewpoint of improving the concealability of the top sheet 2, the top sheet 2 may contain an inorganic filler such as titanium oxide, barium sulfate, or calcium carbonate.

The top sheet 2 may be a laminated film. As a laminated film, the laminated film of the synthetic resin film layer and the fiber assembly layer provided in the surface by the side of the clothing is mentioned, for example. The fiber assembly layer contains, for example, paper, nonwoven fabric or the like that is an assembly of hydrophilic fibers. The nonwoven fabric used as the fiber assembly layer is preferably a tissue. Here, the tissue refers to a thin paper having a basis weight of 10 g / m ² or more and 20 g / m ² or less having wet strength with kraft pulp, rayon or the like as a main component. The thickness of the fiber assembly layer is preferably 0.1 to 0.5 mm. The fiber assembly layer can impart hydrophilicity and flexibility to the top sheet 2. When a tissue is used for the fiber assembly layer, the tissue is cheaper than other papers and non-woven fabrics, and is easy to procure because it is widely available on the market. Although the strength of the tissue layer is low, the strength of the top sheet 2 is ensured by using it together with the synthetic resin film layer.

  As shown in FIG.1 and FIG.2, the pressing grooves 5a and 5b are each formed in the peripheral part of the excretion opening | mouth contact | abutting area | region 20a and the surrounding area 20b among the top sheets 2. FIG. Since the sanitary napkin 1 is stably convexly deformed starting from the compressed grooves 5a and 5b, the stretchable region 21 is prevented from being excessively compressed when the sanitary napkin 1 is convexly deformed. The elastic restoring force of the flexible region 22 that prevents the second bending is effectively generated.

  The compressed grooves 5a and 5b are formed by compressing and integrating the peripheral portions of the excretory opening contact region 20a and the surrounding region 20b and the absorber 4 by embossing using a heating roller, for example.

  As shown in FIG.1 and FIG.2, the pressing grooves 5a and 5b are respectively formed in the whole peripheral part of the excretion opening | mouth contact | abutting area | region 20a and the surrounding area 20b. By changing the present embodiment, the squeezing grooves 5a and 5b may be formed in part of the peripheral edge portions of the excretory opening contact region 20a and the surrounding region 20b, respectively.

  As shown in FIG. 2, an adhesive layer S is provided between the absorbent body 4 and the back sheet 3, and the absorbent body 4 is fixed to the back sheet 3 by the adhesive layer S. The adhesive layer S is formed on substantially the entire joining surface between the absorber 4 and the back sheet 3. However, the adhesive layer S is joined to the absorber 4 and the back sheet by modifying this embodiment. You may form in a part of surface.

  Examples of the adhesive contained in the adhesive layer S include a hot melt adhesive. Examples of the hot melt adhesive include styrene-ethylene-butadiene-styrene (SEBS) and styrene-butadiene-styrene (SBS). ), Pressure-sensitive adhesives or heat-sensitive adhesives mainly composed of rubbers such as styrene-isoprene-styrene (SIS) or olefins such as linear low density polyethylene; water-soluble polymers (for example, , Polyvinyl alcohol, carboxymethyl cellulose, gelatin, etc.) or a water-sensitive adhesive comprising a water-swellable polymer (eg, polyvinyl acetate, sodium polyacrylate, etc.). Specific examples of the method for applying the adhesive include spiral coating, coater coating, curtain coater coating, summit gun coating, and the like.

  The peripheral edge portions of the excretory opening contact region 20a and the surrounding region 20b are fixed to the absorbent body 4 through the compressed grooves 5a and 5b, and the absorbent body 4 is fixed to the back sheet 3 through the adhesive layer S. is there. That is, the peripheral part of the excretory opening contact region 20a is fixed to the back sheet 3 through the pressing groove 5a and the adhesive layer S, and the peripheral part of the peripheral region 20b is connected through the pressing groove 5b and the adhesive layer S. It is fixed to the backsheet 3. Therefore, when the sanitary napkin 1 is deformed in a convex shape, the excretory opening contact region 20a and the surrounding region 20b are prevented from being separated from the back sheet 3, and tension is effectively applied to the flexible region 22, so that the absorber 4 The elastic restoring force of the flexible region 22 that prevents the stretch of the stretchable region 21 that prevents over-compression and the deflection of the topsheet 2 is effectively generated.

  As shown in FIG. 2, the space between the top sheet 2 and the back sheet 3 is divided by the compressed grooves 5a and 5b, and the space between the top sheet 2 and the back sheet 3 is closed by the compressed grooves 5a. A space 6a and a space 6b closed by the pressing grooves 5a and 5b are formed. The absorber 4 is divided into the absorber 4a existing in the space 6a and the absorber 4b existing in the space 6b by the compressed grooves 5a and 5b. Since the thickness of the excretory opening contact region 20a comes out in advance by the absorbent body 4a, and the convex deformation of the stable excretion opening contact region 20a can be induced by the compressed grooves 5a and 5b, the excretion opening contact region 20a for the user. The fit is improved. Since the absorbent body 4b has a higher density than the absorbent body 4a and can easily maintain rigidity even after excrement absorption, the entire sanitary napkin 1 after excretion absorption is prevented.

  The back sheet 3 is provided on a surface that comes into contact with the user's clothes (underwear) for the purpose of preventing leakage of liquid excrement absorbed by the absorbent body 4. The backsheet 3 preferably has moisture permeability in addition to liquid impermeability in order to reduce stuffiness when worn.

  For example, the back sheet 3 is made of a waterproof nonwoven fabric, a synthetic resin (eg, polyethylene, polypropylene, polyethylene terephthalate, etc.) film, a composite sheet of a nonwoven fabric and a synthetic resin film (eg, spunbond, spunlace, etc.) 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 has an absorptive material layer. The absorptive material contained in the absorptive material layer is not particularly limited as long as it can absorb the user's liquid excreta. 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 absorbent material layer may contain an antiblocking agent, an ultraviolet absorber, a thickening branching agent, a matting agent, a colorant, and other various improving agents.

  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 chemically treating wood pulp; non-wood pulp such as bagasse, kenaf, bamboo, hemp, cotton (eg 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, and a scaly shape. In the case of the particulate shape, the particle size is preferably 50 to 1000 μm, more preferably 100 to 600 μm. .

  The amount of the superabsorbent material contained in the absorbent material layer can be appropriately changed according to the characteristics (for example, absorbency, lightness, etc.) that the sanitary napkin 1 should have, but is usually 0 for the absorbent material layer. -50 mass%, preferably 3-30 mass%, more preferably 5-15 mass%.

The thickness, basis weight, density, and the like of the absorbent material layer can be appropriately changed according to characteristics (for example, absorbency, light weight, etc.) that the sanitary napkin 1 should have. The thickness of the absorbent material layer is generally 1 to 20 mm, preferably 2 to 15 mm, more preferably from 2 to 10 mm, basis weight, usually 100 to 1000 g / m ^2, preferably 150~700g / m ^2, more preferably is 200-500 g / m ^2, the density is usually 0.005 to 0.5 / cm ^3, preferably 0.01~0.2g / cm ^3, more preferably 0.01 to 0.1 g / cm ³ . In addition, the thickness of the absorptive material layer, a fabric weight, a density, etc. may change before and after formation of the pressing grooves 5a and 5b.

  From the viewpoint of improving the cushioning property of the absorbent body 4, the absorbent body 4 preferably has a cushion layer. The cushion layer is formed, for example, on the surface of the absorbent material layer on the top sheet 2 side or the back sheet 3 side, preferably on the surface of the top sheet 2 side. In this case, the absorbent body 4 includes the absorbent material layer and the cushion layer. It takes the form of a laminate having

  The absorber 4 may be covered with a covering material. The covering material is not particularly limited as long as it has liquid permeability and absorber retention, but from the viewpoint of low cost and absorber retention, a tissue formed from a pulverized pulp as a main material by a wet method is preferable.

When the sanitary napkin 1 is sandwiched between the user's inner thighs, bent at the excrement supply area 20 of the top sheet 2 and is convexly deformed toward the excrement supply area 20 side, the following effects are obtained. Demonstrate.
As shown in FIG. 4, when the sanitary napkin 1 is deformed in a convex shape, the top sheet 2 and the back sheet 3 are deformed in a convex shape while the absorbent body 4 is held therebetween. At this time, the extensible region 21 of the liquid supply region 20 of the top sheet 2 can be expanded in the width direction of the sanitary napkin 1, so that the absorbent body 4 is not easily pressed by the liquid supply region 20. Therefore, excessive compression of the absorbent body 4 due to deformation of the sanitary napkin 1 and accompanying rewet are prevented.
When the sanitary napkin 1 is deformed while changing the angle at which the sanitary napkin 1 is bent (for example, when the wearer of the sanitary napkin 1 changes the posture, the angle at which the sanitary napkin 1 is bent becomes an acute angle or an obtuse angle. The top sheet 2 easily follows the deformation of the sanitary napkin 1 by the elastic restoring force (repulsive force) of the flexible region 22. Bending and sticking of the bent sheet to the skin are prevented.

Second Embodiment
In the second embodiment, a blood modifying agent is applied to the surface of the top sheet 2 of the sanitary napkin 1. Since the viscosity and surface tension of menstrual blood discharged to the top sheet 2 are lowered by the blood modifying agent, the menstrual blood quickly moves from the top sheet 2 to the absorber 4 and is absorbed by the absorber 4. By improving the menstrual blood absorption rate of the absorbent body 4, it becomes difficult for highly viscous menstrual blood to remain on the top sheet 2, so that the stickiness of the top sheet 2 is reduced and the surface dryness of the top sheet 2 is improved. The wearer is less likely to feel visually uncomfortable. Furthermore, leakage of menstrual blood discharged to the top sheet 2 from the width direction side of the sanitary napkin 1 is prevented.

  The region to which the blood modifying agent is applied may be the entire surface of the top sheet 2 or a part thereof, but it may include at least a region that contacts the excretion opening (vaginal opening) of the user. preferable. The blood modifying agent is preferably attached to the top sheet 2 in the form of droplets or particles so as not to block the liquid permeation holes of the top sheet 2.

Coating basis weight of the blood modifying agent to the top sheet 2 is preferably 1 to 30 g / m ^2, more preferably from 3 to 10 g / m ^2. If the coating weight of the blood modifying agent is less than 1 g / m ² , it may be difficult to stably apply the blood modifying agent to the top sheet 2, and the coating weight of the blood modifying agent is 30 g / m ^2. When it is larger than m ² , the top sheet 2 may be slimy.

  As a method for applying the blood modifying agent, for example, after heating to a desired temperature, a method using a contact coater such as a slot coater, a non-contact coater such as a spray coater, curtain coater or spiral coater is used. Can be mentioned. A coating method using a non-contact coater is preferable from the viewpoint that the blood modifying agent in the form of droplets can be uniformly dispersed in the top sheet 2 and the top sheet 2 is not damaged.

  The time point at which the blood modifying agent is applied to the top sheet 2 is not particularly limited, but it is preferable to apply the blood modifying agent to the top sheet 2 in the manufacturing process of the sanitary napkin 1 from the viewpoint of suppressing capital investment. When the blood modifying agent is applied to the top sheet 2 in the manufacturing process of the sanitary napkin 1, the blood modifying agent is applied to the top sheet 2 in a process close to the final process from the viewpoint of suppressing reduction of the blood modifying agent. It is preferable. For example, the blood modifying agent may be applied to the top sheet 2 immediately before the packaging process of the sanitary napkin 1.

A region of the top sheet 2 to which the blood modifying agent is applied may be coated with a hydrophilic agent, a water repellent, or the like, or hydrophilicity may be imparted by corona treatment, plasma treatment, or the like. As a result, when the blood modifying agent is lipophilic, hydrophilic portions and lipophilic portions coexist sparsely in the blood modifying agent application area, and the hydrophilic components of menstrual blood (mainly plasma) ) And lipophilic components (mainly blood cells) quickly migrate from the topsheet 2 to the absorbent body 4.
The details of the blood modifying agent will be described in another item.

<Method for producing absorbent article>
Hereinafter, an embodiment of a method for manufacturing an absorbent article will be described using a method for manufacturing a sanitary napkin as an example.
The manufacturing method which concerns on this embodiment is the process (process 1A) which forms the absorber 4, the process (process 2A) which laminates | stacks the top sheet 2 on the absorber 4, and the process (process) which forms a pressing groove in a laminated body. 3A), a step of laminating the backsheet 3 (step 4A), a step of cutting out the sanitary napkin 1 (step 5A), and a step of applying a blood modifying agent to the sanitary napkin 1 (step 6A). The manufacturing apparatus 100 shown in FIG. 5 is used.

[Step 1A]
On the peripheral surface of the suction drum 120 rotating in the machine direction MD, recesses 124 are formed at a required pitch in the circumferential direction as a mold for filling the absorbent material 122. When the suction drum 120 rotates and the recess 124 enters the material supply unit 121, the suction unit 126 acts on the recess 124, and the absorbent material 122 supplied from the material supply unit 121 is vacuum sucked into the recess 124. The material supply unit 121 is formed so as to cover the suction drum 120, and the material supply unit 121 supplies the absorber material 122 to the recess 124 by air conveyance, and the absorber 4 is formed in the recess 124. The The absorber 4 formed in the recess 124 is transferred onto the carrier sheet 110 that proceeds in the machine direction MD.

[Step 2A]
The top sheet 2 is laminated on the absorber 4 to form a laminate 262. In addition, the manufacturing method of the top sheet 2 is mentioned later.

[Step 3A]
When the laminated body 262 passes between the upper roll 131 and the lower roll 132 of the embossing apparatus 130, a compressed groove is formed in the laminated body 262. A convex portion (not shown) having a shape corresponding to the compressed groove is provided on the outer peripheral surface of the upper roll 131. The lower roll 132 is a plain roll having a smooth outer peripheral surface. When the laminated body 262 passes between the upper roll 131 and the lower roll 132 of the embossing apparatus 130, the laminated body 262 is compressed in the thickness direction, and the compressed grooves 5a and 5b are formed in the laminated body 262. The squeezing grooves 5a and 5b are formed in the peripheral portions of the excretion opening contact area 20a and the surrounding area 20b, respectively, in the top sheet 2, and the excretion opening contacting area 20a and the surrounding area are formed by the formation of the pressing grooves 5a and 5b. The peripheral portion of 20b is integrated with the absorber 4.

[Step 4A]
The back sheet 3 supplied from the back sheet roll 140 is laminated on the lower surface (opposite side of the top sheet) of the laminated body 134 where the compressed grooves are formed via the adhesive layer S, and the sanitary napkin 1 The continuum 144 is formed.

[Step 5A]
The continuous body 144 of the sanitary napkin 1 is cut using the cutter 150, and the sanitary napkin 1 is cut out.

[Step 6A]
The blood modifying agent 161 is applied to the central region of the sanitary napkin 1 using the blood modifying agent application spray 160 to form a blood modifying agent layer on the surface of the top sheet 2.

  The blood modifying agent layer is preferably formed at least in the excretion opening contact region 20a in the excreta supply region 20 of the top sheet 2.

  In the present embodiment, the blood modifying agent is applied after the sanitary napkin 1 is cut out, but may be applied at any stage before cutting out, or may be applied in the manufacturing process of the top sheet 2 described later. Good. In order to prevent the blood modifying agent applied during production from flowing down, it is preferable to apply the blood modifying agent downstream of the production process, for example, immediately before packaging the sanitary napkin 1.

  The manufacturing method of the sanitary napkin 1 includes, in addition to steps 1A to 6A, a step of forming seal portion seal portions 7a, 7b, 8a, 8b, a step of forming adhesive portions 9a, 9b, 9c, and the like.

<Method for producing liquid permeable sheet>
Hereinafter, the embodiment of the method for producing a liquid-permeable sheet of the present invention will be described by taking the method for producing the top sheet 2 of the sanitary napkin 1 as an example.
The manufacturing method which concerns on this embodiment includes the process (1B) which forms a recessed part in a synthetic resin film sheet, and the process (2B) which carries out gear extending | stretching of a synthetic resin film sheet.

[Step 1B]
As shown in FIG. 5, the synthetic resin film sheet 212 supplied from the roll 210 passes through the recess forming roll 220, and a recess 2141 is formed in the synthetic resin film sheet 212 (see FIG. 7). The recess forming roll 220 includes a knurled roll 221 and a preheating roll 222 having a smooth surface.

  6A and 6B are diagrams illustrating an example of the knurled roll 221. FIG. FIG. 6A is a diagram illustrating the entire knurled roll 221, and FIG. 6B is an enlarged view of a portion 223 having irregularities on the outer peripheral surface of the knurled roll 221. FIG.6 (c) is a figure which shows an example of the preheating roll 222 which has a smooth surface. On the surface 223 of the knurled roll 221, grid-like convex portions 224 are provided. Thereby, a diamond-shaped recess 225 is formed on the surface of the knurled roll 221. The shape of the recess 225 of the knurled roll 221 is not limited to a rhombus, and may be a square, a rectangle, a parallelogram, a trapezoid, a triangle, a hexagon, or the like.

  The center line interval between the protrusions 224 arranged in parallel in the lattice-like protrusions 224, that is, the pitch of the lattice-like protrusions 224 is preferably 0.2 to 10 mm, more preferably 0.4 to 2 mm. The width of the grid-like convex portion 224 is preferably 0.01 to 1 mm, more preferably 0.03 to 0.1 mm. The length of one side of the rhombic recess 225 is preferably 0.1 to 5 mm, and more preferably 0.2 to 1 mm. These ranges are preferable in terms of improving the formability of the recesses in the synthetic resin film sheet.

  The preheating roll 222 having a smooth surface is maintained at a temperature of 70 ° C. to 100 ° C., and heats the supplied synthetic resin film sheet 212. Thereby, the synthetic resin film sheet 212 becomes soft and easy to mold.

  When the synthetic resin film sheet 212 passes between the rolls 221 and 222, a portion of the synthetic resin film sheet 212 that is in contact with the grid-like convex portions 224 receives a strong pressure in the thickness direction. Thereby, as shown in FIG. 7, fine concave portions 2141 are formed in the synthetic resin film sheet 214. In addition, the recessed part 2141 actually formed in the synthetic resin film sheet 214 is smaller than that shown in FIG. 7, and the number of recessed parts 2141 per unit area is larger than that shown in FIG. The recess 2141 is formed in a region 2143 corresponding to the central region of the sanitary napkin 1 in the synthetic resin film sheet 214. In the synthetic resin film sheet 214, a region corresponding to the sanitary napkin 1 is a region indicated by a dotted line 2142.

[Step 2B]
By passing the synthetic resin film sheet 214 formed with the recesses through the stretched gear roll 230, a region corresponding to the extensible region 21 of the top sheet 2 is bent in the synthetic resin film sheet 214, and the bellows portion 210 is formed. A synthetic resin film sheet 216 is produced. In the synthetic resin film sheet 216, the bellows portion 210 extends in the machine direction (MD) and is arranged in parallel in the width direction, and the cross-sectional shape along the width direction is combined with a substantially U-shaped curve. Wavy. In the synthetic resin film sheet 216, the bellows portion 210 extending in the machine direction is interrupted at a plurality of locations. That is, in the synthetic resin film sheet 216, the bellows portion 210 is formed discontinuously, and the synthetic resin film sheet 214 is not bent at the discontinuous portion. This discontinuous portion corresponds to the flexible region 22 of the topsheet 2.

  The drawing gear roll 230 includes an upper roll 231 and a lower roll 232. 8A is a view for explaining the upper roll 231 of the stretched gear roll 230, and FIG. 8B is a view for explaining the gear teeth 233 arranged on the outer peripheral surface of the upper roll 231. FIG. FIG. 8C is a cross-sectional view taken along the line BB in FIG. The gear teeth 233 extend discontinuously in the circumferential direction of the upper roll 231. That is, the gear teeth 233 extending in the circumferential direction of the upper roll 231 are interrupted at a plurality of locations on the way. A discontinuous portion corresponding to the flexible region 22 of the top sheet 2 is formed by the portion 234 where the gear teeth 233 are interrupted. The portions 234 where the gear teeth 233 are interrupted are arranged so as to be aligned on a straight line in an oblique direction with respect to the direction in which the gear teeth 233 extend.

  The width of the gear teeth 233 is, for example, 0.3 to 0.5 mm, and the distance between the centers of the adjacent gear teeth 233 is, for example, 1.0 to 1.2 mm.

  FIG. 9A is a view for explaining the lower roll 232 of the stretched gear roll 230, and FIG. 9B is a view for explaining the gear teeth 235 arranged on the outer peripheral surface of the lower roll 232. FIG. 9C is a cross-sectional view taken along the line CC of FIG. 9B. The gear teeth 235 extend in the circumferential direction of the lower roll 232. The lower roll 232 is not interrupted at a plurality of locations on the way like the upper roll 231. The width of the gear teeth 235 is, for example, equal to the width of the gear teeth 233 of the upper roll 231, and the distance between the centers of the adjacent gear teeth 235 is, for example, equal to the distance between the centers of the gear teeth 233 of the upper roll 231.

  The length in the radial direction of the upper roll 231 at the portion where the gear teeth 233 of the upper roll 231 and the gear teeth 235 of the lower roll 232 mesh with each other, that is, the biting depth is, for example, 1.25 mm. The gap between the gear teeth 233 of the upper roll 231 and the gear teeth 235 of the lower roll 232 when the gear teeth 233 of the upper roll 231 and the gear teeth 235 of the lower roll 232 are engaged is, for example, 0.25 to 0.25 0.45 mm.

  When the synthetic resin film sheet 214 passes through the stretched gear roll 230, the region 2143 (see FIG. 7) where the concave portion 2141 of the synthetic resin film sheet 214 is formed is formed in the liquid transmission hole 26 (see FIG. 3) of the top sheet 2. A corresponding opening is formed.

  With reference to FIG. 10, the principle that an opening is formed in the synthetic resin film sheet 214 when the synthetic resin film sheet 214 is passed through the stretched gear roll 230 will be described. Note that this principle does not limit the present invention.

  The synthetic resin film sheet 214 is greatly stretched at a portion 236 where the gear teeth 233 of the upper roll 231 and the gear teeth 235 of the lower roll 232 are engaged. The portion where the concave portion 2141 (see FIG. 7) is formed in the above-described concave portion forming step is a portion where the synthetic resin film sheet 214 is thin and further scratched by the lattice-shaped convex portions 224 of the knurled roll 221. Therefore, the strength is weak, and the concave portion 2141 of the synthetic resin film sheet 214 is broken when it is stretched. Therefore, in the portion 236 that has been stretched by the synthetic resin film sheet 214, the concave portion 2141 of the synthetic resin film sheet 214 is torn, and the torn portion of the synthetic resin film sheet 214 is widened to form an opening.

  The synthetic resin film sheet 214 is not stretched so much at the portions 237 and 238 where the gear teeth 233 of the upper roll 231 and the gear teeth 235 of the lower roll 232 are not engaged with each other. For this reason, even if the synthetic resin film sheet 214 passes through the stretched gear roll 230 in the portions 237 and 238 where the gear teeth 233 of the upper roll 231 and the gear teeth 235 of the lower roll 232 in the synthetic resin film sheet 214 do not mesh with each other, The recess 2141 formed in the above-described recess forming step is not torn and does not become an opening.

  In the region where the concave portion 2141 of the synthetic resin film sheet 214 is not formed, even if the synthetic resin film sheet 214 is greatly stretched at the portion 236 where the gear teeth 233 of the upper roll 231 and the gear teeth 235 of the lower roll 232 are engaged with each other. Since the synthetic resin film sheet 214 is not torn, no opening is formed.

<Blood modifying agent>
The blood modifying agent of the present invention has an IOB of about 0.00 to about 0.60, a melting point of about 45 ° C. or less, and a water solubility of about 0.00 to about 0.05 g with respect to 100 g of water at 25 ° C. Is a blood modifying agent.

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. The inorganic value and the organic value are shown in the field of 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 modifying agent of the present invention, the IOB is about 0.00 to about 0.60, preferably about 0.00 to about 0.50, preferably about 0.00 to about 0.40. More preferably, it is about 0 to about 0.30. It is considered that the lower the IOB, the higher the organicity and the higher the affinity with blood cells.

  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 modifying agent of the present invention may be liquid at room temperature or a solid as long as it has a melting point of about 45 ° C. or lower, that is, a melting point of about 25 ° C. or higher, or about 25 ° C. And can have a melting point of, for example, about −5 ° C., about −20 ° C., and the like. The reason why the melting point of the blood modifying agent of the present invention is about 45 ° C. or less will be described later.

  The blood modifying agent of the present invention has a lower melting point, but preferably has a low vapor pressure. The vapor pressure of the blood modifying agent of the present invention is preferably about 0.00 to about 0.01 Pa, more preferably about 0.000 to about 0.001 Pa at 1 atmosphere and 25 ° C., Even more preferably, it is 0.0000 to about 0.0001 Pa. Considering that the absorbent article is used in contact with the human body, the vapor pressure is preferably about 0.00 to about 0.01 Pa at 1 atm and 40 ° C., and about 0.000 to about 0.001 Pa. More preferably, it is about 0.0000 to about 0.0001 Pa. If the vapor pressure is high, vaporization may occur during storage, and problems such as a decrease in the amount of blood modifying agent and odor when worn may occur.

  The melting point of the blood modifying agent of the present invention can be properly used 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, even when the menstrual blood is excreted and then cooled by the ambient temperature by adopting a blood modifying agent having a melting point of about 10 ° C. or less. It is considered that the blood modifying agent can stably modify blood.

  When the absorbent article is used for a long time, it is preferable that the melting point of the blood modifying agent of the present invention is higher in the range of 45 ° C. or lower. This is because the blood modifying agent is difficult to move even when it is worn for a long time, and is hardly affected by sweat, friction at the time of wearing, and the like.

  The water solubility of 0.00-0.05 g was obtained by adding 0.05 g of sample to 100 g of deionized water at 25 ° C., allowing to stand for 24 hours, and after 24 hours, stirring lightly as necessary. Then, it can be measured by visually evaluating whether or not the sample is dissolved.

  In the present specification, regarding dissolution in water, “dissolution” includes a case where the sample is completely dissolved in deionized water to form a uniform mixture and a case where the sample is completely emulsified. “Complete” means that there is no lump of sample in deionized water.

  In this technical field, the surface of a top sheet is coated with a surfactant for the purpose of changing the surface tension of blood and the like to absorb blood rapidly. However, since surfactants generally have high water solubility, top sheets coated with surfactants are well-suited to hydrophilic components (blood plasma, etc.) in blood, but rather leave blood on the top sheet. There is a tendency to work. Since the blood modifying agent of the present invention has low water solubility, unlike a conventionally known surfactant, it is considered that blood can be quickly transferred to an absorber without remaining in the top sheet.

  In the present specification, the solubility in 100 g of water at 25 ° C. may be simply referred to as “water solubility”.

In this specification, “weight average molecular weight” refers to a polydisperse compound (for example, a compound produced by sequential polymerization, an ester produced from a plurality of fatty acids and a plurality of aliphatic monohydric alcohols), It is a concept including one compound (for example, one fatty acid and one ester formed from one aliphatic monohydric alcohol), and N _i molecules having a 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 modifying agent of the present invention is preferably 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 a plurality 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 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) 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 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, a paraffinic hydrocarbon, an olefinic hydrocarbon, and two double bonds. More preferred are hydrocarbons (not including triple bonds), and more preferred are paraffinic hydrocarbons.
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 (iii) above, at least one hydrogen atom in the hydrocarbon moiety is substituted with a hydroxyl group (-) than in a compound in which at least one hydrogen atom in the hydrocarbon moiety is substituted with a carboxyl group (-COOH). Compounds substituted with OH) are preferred. As shown in Table 1, since the carboxyl group binds to menstrual metals and the like, and the inorganic value increases significantly from 150 to 400 or more, the blood modifying agent having a carboxyl group is used at the time of use. This is because the value of IOB exceeds about 0.60, and the affinity with blood cells may be reduced.

The blood modifying agent of the present invention 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 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 the 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.

  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.

  The blood modifying agent of the present invention more preferably has about 1.8 or less carbonyl bonds (—CO—) and two ester bonds (—COO—) per 10 carbon atoms in the hydrocarbon moiety. Hereinafter, about 1.5 or less carbonate bonds (—OCOO—), about 6 or less ether bonds (—O—), about 0.8 or less carboxyl groups (—COOH), and / or hydroxyl groups ( -OH) can be compounds having about 1.2 or less.

The blood modifying agent of the present invention 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 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 compound having a chain hydrocarbon moiety and a hydroxyl group that replaces 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 CC 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 _{2 ~ 6} alkylene glycol or its alkyl ester or alkyl ether, and (F) a chain hydrocarbon,
As well as any combination thereof.
Hereinafter, the blood modifying agent according to (A) to (F) will be described in detail.

[(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 Esters with compounds having one carboxyl group replacing a hydrogen atom of a chain 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, and the chain As long as the ester with a compound having one carboxyl group that replaces the hydrogen atom of the hydrocarbon moiety (hereinafter sometimes referred to as “compound (A)”) has the above-mentioned IOB, melting point and water solubility, , Not all hydroxyl groups may be esterified.

(A1) As a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms in the chain hydrocarbon moiety (hereinafter sometimes referred to as “compound (A1)”) A chain hydrocarbon tetraol, such as an alkanetetraol, such as pentaerythritol, a chain hydrocarbon triol, such as an alkanetriol, such as glycerin, and a chain hydrocarbon diol, such as an alkanediol, such as, for example, Glycol.
Examples of the compound (A2) having a chain hydrocarbon moiety and one carboxyl group that replaces the hydrogen atom of the chain hydrocarbon moiety (hereinafter sometimes referred to as “compound (A2)”) include: , A compound in which one hydrogen atom on a hydrocarbon is substituted with one carboxyl group (—COOH), for example, a fatty acid.
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 the 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 the fatty acid (R ¹ COOH, R ² COOH, R ³ COOH, and R ⁴ COOH) constituting the ester of pentaerythritol and fatty acid, the ester of pentaerythritol and fatty acid has the above-mentioned IOB, melting point and water solubility. as long as it satisfies the 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 ), Examples include triacontanoic acid (C ₃₀ ) and the like, and isomers thereof (excluding those mentioned above).

The fatty acid can also be an unsaturated fatty acid. Examples of the unsaturated fatty acid 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 ), Oleic acid (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 ), Triunsaturated fatty acids such as eicosadienoic acid (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, For example, α-eleostearic acid (C ₁₈ ) and β-eleostearic acid (C ₁₈ ), mead acid (C ₂₀ ), dihomo-γ-linolenic acid (C ₂₀ ), eicosatrienoic acid (C ₂₀ ) Tetraunsaturated fatty acids such as Aridon 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 fatty acid is 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. preferable.
The ester of pentaerythritol and fatty acid is preferably a diester, triester or tetraester, more preferably a triester or tetraester, in order to reduce IOB and make it more hydrophobic. And tetraesters are more preferred.

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, in the above formula (1), R ¹ C, R ² C, R ³ C and When the total number of carbon atoms in the R ⁴ C portion is 15, IOB is 0.60. Therefore, in the tetraester of pentaerythritol and fatty acid, the IOB satisfies the requirement of about 0.00 to about 0.60 when the total number of carbon atoms is about 15 or more.
In the tetraester of pentaerythritol and fatty acid, for example, pentaerythritol, hexanoic acid (C ₆ ), heptanoic acid (C ₇ ), octanoic acid (C ₈ ), for example, 2-ethylhexanoic acid (C ₈ ), And tetraesters with nonanoic acid (C ₉ ), decanoic acid (C ₁₀ ) and / or dodecanoic acid (C ₁₂ ).

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, in the above formula (2), R ¹ C, R ² C and R ³ C moieties When the total number of carbon atoms is 19, IOB is 0.58. Therefore, in the triester of pentaerythritol and fatty acid, the IOB satisfies the requirement of about 0.00 to about 0.60 when the total number of carbon atoms of the fatty acid is about 19 or more.

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 total number of carbon atoms of the R ¹ C and R ² C moieties in the above formula (3) is In the case of 22, the IOB is 0.59. Accordingly, in the diester of pentaerythritol and fatty acid, the IOB satisfies the requirement of about 0.00 to about 0.60 when the total number of carbon atoms of the fatty acid is about 22 or more.

In the monoester of pentaerythritol and fatty acid, the number of carbons of the fatty acid constituting the monoester of pentaerythritol and fatty acid, that is, in the above formula (4), the IOB is 25 when the carbon number of the R ¹ C portion is 25. 0.60. Therefore, in the monoester of pentaerythritol and fatty acid, when the fatty acid has about 25 or more carbon atoms, IOB satisfies the requirement of about 0.00 to about 0.60.
In the above calculation, the influence of double bond, triple bond, iso branch, and tert branch is not taken into consideration.

  As a commercial item of the ester of the said pentaerythritol and a fatty acid, Unistar H-408BRS, H-2408BRS-22 (mixture), etc. (above, NOF Corporation make) are mentioned.

[Ester of (a ₂ ) chain hydrocarbon triol and at least one fatty acid]
Examples of the ester of the 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 the fatty acid (R ⁵ COOH, R ⁶ COOH and R ⁷ COOH) constituting the ester of the glycerin and the fatty acid, as long as the ester of the glycerin and the fatty acid satisfies the requirements for the IOB, melting point and water solubility, In particular, the fatty acids listed in “Ester of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid”, that is, saturated fatty acids and unsaturated fatty acids, and the like are modified by oxidation or the like. In consideration of the possibility, it is preferable to use 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.

  The ester of glycerin and fatty acid is preferably a diester or triester and more preferably a triester in order to reduce IOB and make it more hydrophobic.

The triester of glycerin and a fatty acid is also referred to as a triglyceride. For example, triester of glycerin and octanoic acid (C ₈ ), triester 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 the 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 decane. 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 Examples thereof include triesters with (C ₁₆ ) and octadecanoic acid (C ₁₈ ).

As 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, R ⁵ C in formula (5) in order to make the melting point about 45 ° C. or less. , R ⁶ C and R ⁷ C moieties preferably have a total carbon number of about 40 or less.

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, in the formula (5), R ⁵ C, R ⁶ C and R ⁷ C moieties. When the total number of carbon atoms is 12, the IOB is 0.60. Therefore, in the triester of the glycerin and the fatty acid, the IOB satisfies the requirement of about 0.00 to about 0.60 when the total number of carbon atoms of the fatty acid is about 12 or more.
The 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 the above-mentioned triester 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 (above, manufactured by NOF Corporation). ) And the like.

The diester of glycerin and fatty acid is also called diglyceride. For example, diester of glycerin and decanoic acid (C ₁₀ ), diester of glycerin and dodecanoic acid (C ₁₂ ), glycerin and hexadecanoic acid (C ₁₆ ) Examples include diesters, diesters of glycerin and two fatty acids, and mixtures thereof.

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, the total number of carbon atoms of the R ⁵ C and R ⁶ C moieties in the formula (6) is 16. The IOB is 0.58. Therefore, in the diester of glycerin and fatty acid, the IOB satisfies the requirement of about 0.00 to about 0.60 when the total number of carbon atoms of the fatty acid is about 16 or more.

The monoester of the glycerin and the fatty acid is also referred to as a monoglyceride, and examples thereof include glycerin icosanoic acid (C ₂₀ ) monoester, glycerin docosanoic acid (C ₂₂ ) monoester, and the like.
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, when the carbon number of the R ⁵ C moiety in the formula (7) is 19, the IOB is 0.59. It becomes. Therefore, in the monoester of the glycerin and the fatty acid, when the carbon number of the fatty acid is about 19 or more, the IOB satisfies the requirement of about 0.00 to about 0.60.

[Ester of (a ₃ ) chain hydrocarbon diol and at least one fatty acid]
Examples of the ester of the 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. Examples thereof include monoesters or diesters of glycol, pentylene glycol or hexylene glycol and a fatty acid.

Specifically, as the ester of the 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 an ester of a fatty acid satisfying the above requirements of IOB, melting point and water solubility, for example, “(a ₁ ) ester of chain hydrocarbon tetraol and at least one fatty acid” The fatty acids listed in the above, 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.

In the diester of butylene glycol (k = 4) and a fatty acid represented by the formula (8), when the total number of carbon atoms in the R ⁸ C and R ⁹ C moieties is 6, IOB is 0.60. Therefore, in the diester of butylene glycol (k = 4) and the fatty acid represented by the formula (8), when the total number of carbon atoms is about 6 or more, the IOB has a requirement of about 0.00 to about 0.60. Fulfill. Moreover, in the monoester of ethylene glycol (k = 2) and a fatty acid represented by the formula (9), when the carbon number of the R ⁸ C portion is 12, the IOB is 0.57. Accordingly, in the monoester of ethylene glycol (k = 2) and a fatty acid represented by the formula (9), when the fatty acid has about 12 or more carbon atoms, the IOB is about 0.00 to about 0.60. Meet.

The ester of a 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 it is preferable -C ₆ glycol and an ester of saturated fatty acids.

As the ester of a C ₂ -C ₆ glycol and fatty acid, to reduce the IOB, in order to more hydrophobic, from large glycol carbon number, esters of glycols with fatty acids, for example, butylene glycol An ester of glycol and fatty acid derived from pentylene glycol or hexylene glycol is preferable.

Furthermore, the ester of the C ₂ -C ₆ glycol and the fatty acid is preferably a diester in order to reduce IOB and make it more hydrophobic.
Examples of commercial products of esters of the C ₂ -C ₆ glycols with fatty acids, for example, COMPOL BL, COMPOL BS (products of NOF Corporation) and the like.

[(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 above Ether with a compound having one hydroxyl group replacing a hydrogen atom of a chain 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 As long as it has the above-mentioned IOB, melting point and water solubility, an ether with a compound having one hydroxyl group that substitutes a hydrogen atom of the hydrocarbon moiety (hereinafter sometimes referred to as “compound (B)”) , All the hydroxyl groups may not be etherified.

(B1) Compounds having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms in the chain hydrocarbon moiety are listed as compounds (A1) in “Compound (A)”. For example, pentaerythritol, glycerin, and glycol.
Examples of the compound (B2) having a chain hydrocarbon moiety and one hydroxyl group replacing the hydrogen atom of the chain hydrocarbon moiety (hereinafter sometimes referred to as “compound (B2)”) include: , Compounds in which one hydrogen atom of a hydrocarbon is replaced by one hydroxyl group (—OH), such as aliphatic monohydric alcohols, for example, saturated aliphatic monohydric alcohols and unsaturated aliphatic monohydric alcohols Is 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, e.g., isopropyl alcohol (C _3), butyl alcohol (C ₄₎ and isomers thereof, for example, 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), Hexadecyl alcohol (C _16), to heptadecyl alcohol (C _17), octadecyl alcohol (C _18), and eicosyl alcohol (C _20), and isomers thereof that are not listed in these.

  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, such as oleyl alcohol. It is commercially available from Shin Nippon 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 the chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol include 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 the chain hydrocarbon triol 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.

Examples of the ether of the chain hydrocarbon diol and at least one aliphatic monohydric alcohol include 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.

In the tetraether of pentaerythritol and aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the tetraether of pentaerythritol and aliphatic monohydric alcohol, that is, in the above formula (10), When the total number of carbon atoms in the R ¹⁰ , R ¹¹ , R ¹² and R ¹³ parts is 4, the IOB is 0.44. Therefore, in the tetraether of pentaerythritol and aliphatic monohydric alcohol, when the total number of carbon atoms of the aliphatic monohydric alcohol is about 4 or more, the IOB is about 0.00 to about 0.60. Fulfill.

In the triether of pentaerythritol and aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the triether of pentaerythritol and aliphatic monohydric alcohol, that is, in the above formula (11), When the total number of carbon atoms in R ¹⁰ , R ¹¹ and R ¹² is 9, IOB is 0.57. Therefore, in the above-mentioned triether of pentaerythritol and aliphatic monohydric alcohol, when the total number of carbon atoms of the aliphatic monohydric alcohol is about 9 or more, the IOB has a requirement of about 0.00 to about 0.60. Fulfill.

In the diether of pentaerythritol and aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the diether of pentaerythritol and aliphatic monohydric alcohol, that is, in the formula (12), R ¹⁰ When the total number of carbon atoms in the R ¹¹ portion is 15, the IOB is 0.60. Therefore, in the diether of pentaerythritol and aliphatic monohydric alcohol, when the total number of carbon atoms of the aliphatic monohydric alcohol is about 15 or more, the IOB satisfies the requirement of about 0.00 to about 0.60. .

In the monoether of pentaerythritol and aliphatic monohydric alcohol, the carbon number of the aliphatic monohydric alcohol constituting the monoether of pentaerythritol and aliphatic monohydric alcohol, that is, in the above formula (13), R ¹⁰ When the number of carbon atoms in the portion is 22, the IOB is 0.59. Therefore, the monoether of pentaerythritol and aliphatic monohydric alcohol satisfies the requirement that IOB is about 0.00 to about 0.60 when the aliphatic monohydric alcohol has about 22 or more carbon atoms.

In the triether of glycerin and aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the triether of glycerin and aliphatic monohydric alcohol, that is, in the formula (14), R ^When the total number of carbon atoms in the ¹⁴ , R ¹⁵ and R ¹⁶ parts is 3, the IOB is 0.50. Therefore, in the above triether of glycerin and aliphatic monohydric alcohol, when the total number of carbon atoms of the aliphatic monohydric alcohol is about 3 or more, IOB satisfies the requirement of about 0.00 to about 0.60. .

In the diether of glycerin and aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the diether of glycerin and aliphatic monohydric alcohol, that is, in the formula (15), R ¹⁴ and R ¹⁵ When the total number of carbon atoms in the portion is 9, the IOB is 0.58. Therefore, in the diether of the glycerin and the aliphatic monohydric alcohol, when the total number of carbon atoms of the aliphatic monohydric alcohol is about 9 or more, the IOB satisfies the requirement of about 0.00 to about 0.60.

In the monoether of glycerin and aliphatic monohydric alcohol, the carbon number of the aliphatic monohydric alcohol constituting the monoether of glycerin and aliphatic monohydric alcohol, that is, the carbon of R ¹⁴ moiety in the formula (16). When the number is 16, the IOB is 0.58. Therefore, in the monoether of the glycerin and the aliphatic monohydric alcohol, the IOB satisfies the requirement of about 0.00 to about 0.60 when the aliphatic monohydric alcohol has about 16 or more carbon atoms.

In the diether of butylene glycol (n = 4) and aliphatic monohydric alcohol represented by the formula (17), when the total number of carbon atoms in the R ¹⁷ and R ¹⁸ parts is 2, the IOB is 0.33. . Therefore, in the diether of butylene glycol (n = 4) and the aliphatic monohydric alcohol represented by the formula (17), when the total number of carbon atoms of the aliphatic monohydric alcohol is 2 or more, the IOB is about 0.00 Meet the requirement of ~ 0.60. Further, in the monoether of ethylene glycol (n = 2) and aliphatic monohydric alcohol represented by the formula (18), when the number of carbon atoms in the R ¹⁷ portion is 8, the IOB is 0.60. Therefore, in the monoether of ethylene glycol (n = 2) and the aliphatic monohydric alcohol represented by the formula (18), when the aliphatic monohydric alcohol has about 8 or more carbon atoms, the IOB is about 0. Meet the requirements of 00 to about 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 that replace the hydrogen atoms of the chain hydrocarbon moiety; (C2) Ester of a compound having a chain hydrocarbon moiety and one hydroxyl group substituting 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 replacing the hydrogen atom of the chain hydrocarbon moiety; C2) An ester (hereinafter sometimes referred to as “compound (C)”) of a compound having a chain hydrocarbon moiety and one hydroxyl group that substitutes a hydrogen atom of the chain hydrocarbon moiety, As long as it has the above-mentioned IOB, melting point and water solubility, all carboxyl groups may not be esterified.

  (C1) Carboxylic acids, hydroxy acids, alkoxy acids or oxo acids (hereinafter referred to as “compounds”) containing a chain hydrocarbon moiety and 2 to 4 carboxyl groups that replace the hydrogen atoms of the chain hydrocarbon moiety. C1) "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 acids such as alkanetricarboxylic acid such as propane Acid, butanetriacid, pentanetriacid, hexanetriacid, heptanetriacid, octanetriacid, nonanetriacid and decanetriacid, and chain hydrocarbon tetracar Examples include boronic 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, An aliphatic monohydric alcohol is mentioned.

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

[(D ₁ ) Ether of aliphatic monohydric alcohol and aliphatic monohydric alcohol]
Examples of the ether of the aliphatic monohydric alcohol and the aliphatic monohydric alcohol include 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 requirements for the IOB, melting point and water solubility. The aliphatic monohydric alcohol listed in the section of “Compound (B)” is not particularly limited.

In the ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the ether, that is, the number of carbon atoms of R ¹⁹ and R ²⁰ in the above formula (19). Since the IOB is 0.50 when the sum of the two is 2, the IOB requirement is satisfied if the total number of carbon atoms is about 2 or more. However, when the total number of carbon atoms is about 6, the water solubility is as high as about 2 g, which is problematic from the viewpoint of vapor pressure. In order to satisfy the requirement of water solubility of about 0.00 to about 0.05 g, the total number of carbon atoms is preferably about 8 or more.

[(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 the dialkyl ketone, since the IOB is 0.54 when the total number of carbon atoms of R ²¹ and R ²² is 5, the IOB requirement is satisfied if the total number of carbon atoms is about 5 or more. However, when the total number of carbon atoms is about 5, the water solubility is as high as about 2 g. Therefore, in order to satisfy the requirement of water solubility of about 0.00 to about 0.05 g, the total number of carbon atoms is preferably about 8 or more. In consideration of the vapor pressure, the carbon number is preferably about 10 or more, and more preferably about 12 or more.
When the total number of carbon atoms is about 8, for example, 5-nonanone has a melting point of about −50 ° C. and a vapor pressure of about 230 Pa at 20 ° C.
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 the fatty acid and the 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)) are listed in “(a ₁ ) ester of chain hydrocarbon tetraol and at least one fatty acid”. Fatty acids, that is, saturated fatty acids or unsaturated fatty acids can be mentioned, and saturated fatty acids are preferable 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)”.

In the ester of the fatty acid and the aliphatic monohydric alcohol, the total number of carbon atoms of the fatty acid and the aliphatic monohydric alcohol, that is, the total number of carbon atoms in the R ²³ C and R ²⁴ portions in the formula (21) is 5 In this case, since the IOB is 0.60, the above IOB requirement is satisfied when the total number of carbon atoms in the R ²³ C and R ²⁴ portions is about 5 or more. However, for example, butyl acetate having a total of 6 carbon atoms has a high vapor pressure of over 2,000 Pa. Therefore, considering the vapor pressure, the total number of carbon atoms is preferably about 12 or more. When the total number of carbon atoms is about 11 or more, the water solubility can satisfy the requirement of about 0.00 to about 0.05 g.

Examples of the ester of the fatty acid and the aliphatic monohydric alcohol include, for example, an ester of dodecanoic acid (C ₁₂ ) and dodecyl alcohol (C ₁₂ ), tetradecanoic acid (C ₁₄ ), and dodecyl alcohol (C ₁₂ ). Examples of commercially available esters of the above fatty acids and aliphatic monohydric alcohols include Electol 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.

In the dialkyl carbonate, since the IOB is 0.57 when the total number of carbon atoms of R ²⁵ and R ²⁶ is 6, if the total number of carbon atoms of R ²⁵ and R ²⁶ is about 6 or more, Satisfy requirements.
In consideration of water solubility, the total number of carbon atoms of R ²⁵ and R ²⁶ is preferably about 7 or more, and more preferably about 9 or more.
In addition to being commercially available, the dialkyl carbonate can be synthesized by a reaction between phosgene and an alcohol, a reaction between a chlorinated formate and an alcohol or an alcoholate, and a reaction between silver carbonate and an alkyl iodide.

[(E) polyoxy C _{2 ~ 6} alkylene glycol, or an ester or ether]
Polyoxy C _{2 ~ 6} alkylene glycol, or an ester or ether (hereinafter, compound (sometimes referred to as E)) The, (e ₁₎ polyoxy C _{2 ~ 6} alkylene glycol, (e ₂₎ polyoxy C _{2 ~ 6} esters of alkylene glycol and at least one fatty acid, (e ₃₎ polyoxy C _{2 ~ 6} alkylene glycol and at least one aliphatic monohydric ethers of alcohols, and (e ₄₎ polyoxy C _{2 ~ 6} alkylene glycol chain Jo hydrocarbon tetracarboxylic acid, chain hydrocarbon tricarboxylic acid, or esters of chain hydrocarbon dicarboxylic acid, and (e ₅₎ polyoxy C _{2 ~ 6} alkylene glycol and a chain hydrocarbon tetraol, chain hydrocarbon Examples include triols and ethers with chain hydrocarbon diols. This will be described below.

[(E ₁₎ polyoxy C _{2 ~ 6} alkylene glycol]
Polyoxy C _{2 ~ 6} alkylene glycol, i) oxy C _{2 ~ 6} alkylene backbone, i.e., polyoxyethylene backbone, oxypropylene backbone, oxybutylene backbone, oxypentylene skeleton, and is selected from the group consisting of oxy hexylene backbone A homopolymer having any 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 ) Means a random copolymer having two or more skeletons selected from the above group and having hydroxy groups at both ends.

Said oxy C _{2 ~ 6} alkylene skeleton, from the viewpoint of lowering the IOB of polyoxy C _{2 ~ 6} alkylene glycol, polyoxypropylene skeleton, oxybutylene skeleton, it is oxypentylene skeleton, or an oxy hexylene skeleton Preferably, oxy A butylene skeleton, an oxypentylene skeleton, or an oxyhexylene skeleton is more preferable.

Polyoxy C _{2 ~ 6} alkylene glycol, the following equation (23):
_{HO- (C m H 2m O)} n -H (23)
(In the formula, m is an integer of 2 to 6)
Can be represented by:

The present inventors have confirmed that polyethylene glycol (corresponding to a homopolymer of m = 2 in the formula (23)) is about 0 when n ≧ 45 (weight average molecular weight is more than about 2,000). Although satisfying the IOB requirement of 0.00 to about 0.60, the water solubility requirement was not met even when the weight average molecular weight exceeded about 4,000. Therefore, the (e ₁₎ polyoxy C _{2 ~ 6} alkylene glycols, homopolymers of ethylene glycol is considered to not contain ethylene glycol as block or random copolymers with other glycols, (e ₁₎ polyoxy It should be included in the C 2 _{~ 6} alkylene glycol.

Accordingly, the homopolymer of formula (23) may include a homopolymer of propylene glycol, butylene glycol, pentylene glycol or hexylene glycol.
From the above, in formula (23), m is about 3 to about 6, more preferably about 4 to about 6, and n is 2 or more.

In the above formula (23), the value of n, poly C _{2 ~ 6} alkylene glycol, and from about 0.00 to about 0.60 of the IOB, and about 45 ° C. below the melting point, to water 100g of 25 ° C., about A value having a water solubility of 0.00 to about 0.05 g.
For example, when formula (23) is polypropylene glycol (m = 3 homopolymer), IOB is 0.58 when n = 12. Therefore, when Formula (23) is polypropylene glycol (m = 3 homopolymer), the above IOB requirement is satisfied when m ≧ about 12.
Further, when the formula (21) is polybutylene glycol (m = 4 homopolymer), when n = 7, the IOB is 0.57. Accordingly, when Formula (23) is polybutylene glycol (m = 4 homopolymer), the above IOB requirement is satisfied when n ≧ about 7.

From the viewpoint of IOB, melting point and water solubility, the weight average molecular weight of the polyoxy C _4-6 alkylene glycol is preferably about 200 to about 10,000, more preferably about 250 to about 8,000, and more preferably about It is in the range of 250 to about 5,000.
Further, from the viewpoint of IOB, melting point and water solubility, the weight average molecular weight of the polyoxy C ₃ alkylene glycol, ie, polypropylene glycol, is preferably about 1,000 to about 10,000, more preferably about 3,000 to about 8. , And more preferably in the range of about 4,000 to about 5,000. This is because, when the weight average molecular weight is less than about 1,000, the water solubility does not satisfy the requirement, and the higher the weight average molecular weight, the more the absorber transfer speed and the whiteness of the top sheet tend to improve.

Examples of commercial products of polyoxy C _{2 ~ 6} alkylene glycols, for example, UNIOL (TM) D-1000, D-1200 , D-2000, D-3000, D-4000, PB-500, PB-700, PB- 1000 and PB-2000 (above, manufactured by NOF Corporation).

[(E ₂₎ an ester of polyoxy C _{2 ~ 6} alkylene glycol and at least one fatty acid]
The esters of at least one fatty acid and the polyoxy C _{2 ~ 6} alkylene glycol, "(e ₁₎ polyoxy C _{2 ~ 6} alkylene glycol" one of polyoxy C _{2 ~ 6} OH terminus of alkylene glycol described in the section or Both are esterified with fatty acids, ie monoesters and diesters.

In esters of polyoxy C _{2 ~ 6} alkylene glycol and at least one fatty acid, the fatty acid to be esterified, for example, are listed in the "(a ₁₎ an ester of a 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 considering the possibility of modification by oxidation or the like.
Examples of commercial products of esters of polyoxy C _{2 ~ 6} alkylene glycols with fatty acids, for example, Will Bright cp9 (NOF Corporation) and the like.

[(E ₃₎ polyoxy C _{2 ~ 6} alkylene glycol and at least one aliphatic monohydric ether alcohols]
Polyoxy The ether C _{2 ~ 6} alkylene glycol and at least one aliphatic monohydric alcohol, "(e ₁₎ polyoxy C _{2 ~ 6} alkylene glycol" of polyoxy C _{2 ~ 6} alkylene glycol described in the section OH One or both of the terminals are etherified with an aliphatic monohydric alcohol, that is, monoether and diether.
In ether polyoxy C _{2 ~ 6} alkylene glycol and at least one aliphatic monohydric alcohol, the aliphatic monohydric alcohol to be etherified, for example, "compound (B)" aliphatic listed in section 1 And monohydric alcohols.

[(E ₄₎ polyoxy C _{2 ~ 6} alkylene glycol, an ester of a chain hydrocarbon tetracarboxylic acid, chain hydrocarbon tricarboxylic acid or chain hydrocarbon dicarboxylic acid]
And polyoxy C _{2 ~ 6} alkylene glycol and a chain hydrocarbon tetracarboxylic acid, in an ester of a chain hydrocarbon tricarboxylic acid or chain hydrocarbon dicarboxylic acids, as the polyoxy C _{2 ~ 6} alkylene glycol to be esterified, polyoxy C _{2 ~ 6} alkylene glycol described in "(e ₁₎ polyoxy C _{2 ~ 6} alkylene glycol" section and the like. Examples of the chain hydrocarbon tetracarboxylic acid, chain hydrocarbon tricarboxylic acid, and chain hydrocarbon dicarboxylic acid to be esterified include those described in the section of “Compound (C)”.

Esters of polyoxy C _{2 ~ 6} alkylene glycol and a chain hydrocarbon tetracarboxylic acid, and chain hydrocarbon tricarboxylic acid or chain hydrocarbon dicarboxylic acids, in addition to commercially available, chain hydrocarbon tetracarboxylic acid , chain hydrocarbon tricarboxylic acid or chain hydrocarbon dicarboxylic acids, oxy C _{2 ~ 6} alkylene glycol, can be prepared by polycondensation under known conditions.

[(E ₅₎ polyoxy C _{2 ~ 6} alkylene glycol and a chain hydrocarbon tetraol, chain hydrocarbon triol, or an ether of a chain hydrocarbon diol]
The polyoxy C _{2 ~ 6} alkylene glycol and a chain hydrocarbon tetraol, chain hydrocarbon triol, or in an ether of a chain hydrocarbon diol, as the polyoxy C _{2 ~ 6} alkylene glycol to be etherified, "(e ₁₎ polyoxy C _{2 ~ 6} polyoxy C _{2 ~ 6} alkylene glycol is described in the section of the alkylene glycol "it may be mentioned. The chain hydrocarbon tetraol, chain hydrocarbon triol, and chain hydrocarbon diol to be etherified include those described in the section of “Compound (A)”, such as pentaerythritol, glycerin, and glycol. Is mentioned.

The polyoxy C _{2 ~ 6} alkylene glycol and a chain hydrocarbon tetraol, chain hydrocarbon triol, or as ethers commercial products of the chain hydrocarbon diols, for example, UNILUBE (TM) 5TP-300KB, and Uniol (Trademark) TG-3000 and TG-4000 (made by NOF Corporation) are mentioned.
Unilube (trademark) 5TP-300KB is a compound obtained by polycondensation of 1 mol of pentaerythritol with 65 mol of propylene glycol and 5 mol of ethylene glycol. Its IOB is 0.39, and its melting point is less than 45 ° C. Yes, and the water solubility was less than 0.05 g.

Uniol ™ TG-3000 is a compound obtained by polycondensation of 1 mol of glycerin and 50 mol of propylene glycol, its IOB is 0.42, its melting point is less than 45 ° C, and its water solubility is 0.05 g. And the weight average molecular weight was about 3,000.
Uniol ™ TG-4000 is a compound obtained by polycondensation of 70 mol of propylene glycol with 1 mol of glycerin, its IOB is 0.40, its melting point is less than 45 ° C., and its water solubility is 0.05 g. And the weight average molecular weight was about 4,000.

The polyoxy C _{2 ~ 6} alkylene glycol, ether chain hydrocarbon tetraol, chain hydrocarbon triol, or a chain hydrocarbon diol also chain hydrocarbon tetraol, chain hydrocarbon triol or chain to Jo hydrocarbon diols, C 2 _{~ 6} alkylene oxide can be produced by the addition under known conditions.

[(F) chain hydrocarbon]
Since the chain hydrocarbon has an inorganic value of 0, the IOB is 0.00 and the water solubility is approximately 0 g. Therefore, if the melting point is about 45 ° C. or less, the blood It can be included in the modifier. Examples of the chain hydrocarbon include (f ₁ ) chain alkanes such as straight chain alkanes and branched chain alkanes. For example, in the case of straight chain alkanes, the melting point is about 45 ° C. or less. In general, those having 22 or less carbon atoms are included. Moreover, when the vapor pressure is taken into consideration, those having 13 or more carbon atoms are generally included. In the case of a branched chain alkane, the melting point may be lower at the same number of carbons than that of a straight chain alkane. Therefore, those having 22 or more carbon atoms may be included.
As a commercial item of the above-mentioned hydrocarbon, for example, Pearl Ream 6 (NOF Corporation) can be mentioned.

  The blood modifying agent of the present invention, which will be discussed in detail together with the examples, has been found to have at least an action of lowering blood viscosity and surface tension. Compared with normal blood, menstrual blood to be absorbed by the absorbent article contains proteins such as the endometrial wall. Cheap. Therefore, menstrual blood to be absorbed by the absorbent article tends to have a high viscosity, and when the top sheet is a nonwoven fabric or a woven fabric, the menstrual blood is easily clogged between the fibers, and the wearer feels sticky. Easily, and menstrual blood diffuses on the surface of the topsheet, making it easier to leak. On the other hand, by applying the blood modifying agent of the present invention to the top sheet, menstrual blood is not easily clogged between the fibers of the top sheet, and menstrual blood is quickly transferred from the top sheet to the absorber. Is possible.

  The blood modifying agent of the present invention having an IOB of about 0.00 to about 0.60 is highly organic and easily enters between blood cells, so that it is difficult to stabilize blood cells and form a monetary structure in the blood cells. I think it can be done. It is considered that the blood modifying agent of the present invention stabilizes blood cells and makes it difficult to form a monetary structure on the blood cells, so that the absorbent body can easily absorb menstrual blood. For example, in an absorbent article containing an acrylic superabsorbent polymer, so-called SAP, when menstrual blood is absorbed, it is known that the collected blood cells cover the SAP surface and the SAP does not easily exhibit the absorption performance. It is considered that SAP stabilizes blood cells and can easily exhibit absorption performance. In addition, it is considered that the blood modifying agent having a high affinity for red blood cells protects the red blood cell membrane, so that the red blood cells are hardly destroyed.

The blood modifying agent of the present invention preferably has a weight average molecular weight of about 2,000 or less, and more preferably has a weight average molecular weight of 1,000 or less. This is because when the weight average molecular weight increases, it becomes difficult to lower the viscosity of the blood modifying agent to a viscosity suitable for coating, and there is a case where the blood modifying agent should be diluted with a solvent. Moreover, when the weight average molecular weight is increased, the blood modifying agent is tacky, which may cause discomfort to the wearer.
The following examples confirmed that the blood modifying agent has a mechanism for lowering blood viscosity and surface tension.

Hereinafter, although an example is given and the present invention is explained, the present invention is not limited to these examples.
[Example 1]
[Blood modifier data]
A commercially available sanitary napkin was prepared. The sanitary napkin includes a top sheet formed from an air-through nonwoven fabric (composite fiber made of polyester and polyethylene terephthalate, basis weight: 35 g / m ² ) treated with a hydrophilic agent, and an air-through nonwoven fabric (composite made of polyester and polyethylene terephthalate). Second sheet formed from fiber, basis weight: 30 g / m ² ), pulp (basis weight: 150 to 450 g / m ² , more in the center), acrylic superabsorbent polymer (basis weight: 15 g / m ² ) And an absorbent body containing a tissue as a core wrap, a side sheet treated with a water repellent, and a back sheet made of a polyethylene film.

The blood modifying agents used in the experiment are listed below.
[Ester of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid]
Unistar H-408BRS, manufactured by NOF Corporation Tetra-2-ethylhexanoate pentaerythritol, weight average molecular weight: about 640
Unistar H-2408BRS-22, manufactured by NOF Corporation Mixture of 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 weight 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]
-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
Unistar H-208BRS, NOF Corporation di-2-ethylhexanoic acid neopentyl glycol, weight average molecular weight: about 360

[(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

[(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 _2-6 alkylene glycol]
・ 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 1,200
-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
・ 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

・ Uniol PB1000R, polybutylene glycol manufactured by NOF Corporation, weight average molecular weight: about 1000
[(E ₂ ) ester of polyoxy C _2-6 alkylene glycol and at least one fatty acid]
-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

[(E ₃ ) ether of polyoxy C _2-6 alkylene glycol and at least one fatty acid]
Unilube MS-70K, NOF Corporation Polypropylene glycol stearyl ether, about 15 repeating units, weight average molecular weight: about 1,140

[(E ₅ ) Ether of polyoxy C _2-6 alkylene glycol and chain hydrocarbon tetraol, chain hydrocarbon triol, or chain hydrocarbon diol]
・ 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

-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

[(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 D-400, manufactured by NOF Corporation, polypropylene glycol, weight average molecular weight: about 400

PEG 1500, manufactured by NOF Corporation, polyethylene glycol, weight average molecular weight: about 1,500 to about 1,600
Nonionic S-6, manufactured by NOF Corporation, polyoxyethylene monostearate, about 7 repeating units, weight average molecular weight: about 880
-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

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

The IOB, melting point and water solubility of the sample are shown in Table 2 below.
The water solubility was measured according to the method described above, but 20.0 g was added to 100 g of demineralized water, and the sample dissolved after 24 hours was evaluated as “20 g <”. Samples that dissolved 0.05 g but did not dissolve 1.00 g were evaluated as 0.05 to 1.00 g.
Regarding the melting point, “<45” means that the melting point is less than 45 ° C.

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

FIG. 12 is an electron micrograph of the skin contact surface of the top sheet in a sanitary napkin (No. 2-5) in which the top sheet contains tri-C2L oil fatty acid glycerides. As is apparent from FIG. 12, the tri-C2L oil fatty acid glyceride is in the form of fine particles and adheres to the fiber surface.
According to the above-mentioned procedure, the rewetting rate and the absorber transfer speed were measured. The results are shown in Table 2 below.

[Test method]
An acrylic plate with a hole (200 mm × 100 mm, 125 g, a hole of 40 mm × 10 mm is opened in the center) is placed on the top sheet containing each blood modifying agent, and 37 ± 1 ° C. from the hole. 3 g of equine EDTA blood (with equine blood added with ethylenediaminetetraacetic acid (hereinafter referred to as “EDTA”) to prevent coagulation) (1st time) using a pipette 3 g of equine EDTA blood at 37 ± 1 ° C. was dropped again with a pipette from the hole in the acrylic plate (second time).

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

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

Subsequently, the whiteness of the skin contact surface of the top sheet after the test of the absorber transfer speed was visually evaluated according to the following criteria.
A: Almost no red blood remains, and it is not possible to distinguish between a place where blood is present and a place where blood does not exist. ○: Although a little red blood remains, It is difficult to distinguish the place where it does not exist. △: Some blood red remains, and the place where the blood existed. X: The blood red remains as it is. Show.

  In the absence of a blood modifying agent, the rewetting rate was 22.7% and the absorber transfer rate was more than 60 seconds, but all triesters of glycerin and fatty acids had a rewetting rate. Since it is 7.0% or less and the absorber transfer speed is 8 seconds or less, it can be seen that the absorption performance is greatly improved. However, among the triesters of glycerin and fatty acid, NA50 having a melting point exceeding 45 ° C. did not significantly improve the absorption performance.

  Similarly, a blood modifying agent having an IOB of about 0.00 to about 0.60, a melting point of about 45 ° C. or less, and a water solubility of about 0.00 to about 0.05 g for 100 g of water at 25 ° C. It was found that the absorption performance was greatly improved.

[Example 2]
The rewetting rate was evaluated according to the procedure described above for various animal blood. The blood used in the experiment is as follows.
[Animal species]
(1) Human (2) Horse (3) Sheep

[Blood species]
・ Defibrinated blood: After collecting blood, stirred for about 5 minutes in an Erlenmeyer flask with glass beads ・ EDTA blood: 65 mL of venous blood plus 0.5 mL of 12% EDTA / 2K physiological saline

[Fractionation]
Serum or plasma: supernatant after centrifuging defibrinated blood or EDTA blood, respectively, at room temperature at about 1900 G for 10 minutes. Blood cell: serum is removed from the blood, and the residue is phosphate buffered saline (PBS ) Washed twice and then added with phosphate buffered saline for the removed serum

An absorbent article was produced in the same manner as in Example 2 except that the tri-C2L oil fatty acid glyceride was applied so that the basis weight was approximately 5 g / m ^2, and the rewetting rate was evaluated for the various blood types described above. . The measurement was performed 3 times for each blood, and the average value was adopted.
The results are shown in Table 3 below.

  Similar trends to equine EDTA blood obtained in Example 2 were obtained with human and sheep blood. Similar trends were also observed in defibrinated blood and EDTA blood.

[Example 3]
[Evaluation of blood retention]
The blood retention in the top sheet containing the blood modifying agent and the top sheet not containing the blood modifying agent was evaluated.

[Test method]
(1) Tri C2L oil fatty acid glyceride is applied to the skin contact surface of the top sheet formed from an air-through nonwoven fabric (a composite fiber composed of polyester and polyethylene terephthalate, basis weight: 35 g / m ² ) using a control seam HMA gun. It is atomized and applied so that the basis weight is approximately 5 g / m ² . Moreover, the thing which has not apply | coated the tri C2L oil fatty-acid glyceride is also prepared for a comparison. Next, both the top sheet coated with tri C2L oil fatty acid glyceride and the uncoated top sheet are cut to a size of 0.2 g, and the mass (a) of the cell strainer + top sheet is accurately determined. taking measurement.

(2) About 2 mL of horse EDTA blood is added from the skin contact surface side and allowed to stand for 1 minute.
(3) Place cell strainer in centrifuge tube and spin down to remove excess horse EDTA blood.
(4) The weight (b) of the top sheet containing the cell strainer + horse EDTA blood is measured.
(5) The initial absorption amount (g) per 1 g of the top sheet is calculated according to the following formula.
Initial absorption amount = [weight (b) −weight (a)] / 0.2
(6) The cell strainer is reset in the centrifuge tube and centrifuged at about 1200 G for 1 minute at room temperature.

(7) Measure weight (c) of top sheet containing cell strainer + horse EDTA blood.
(8) The post-test absorption amount (g) per 1 g of the top sheet is calculated according to the following formula.
Absorption after test = [weight (c) −weight (a)] / 0.2
(9) Blood retention (%) was calculated according to the following formula.
Blood retention rate (%) = 100 × absorption after test / initial absorption The measurement was performed three times and the average value was adopted.
The results are shown in Table 4 below.

  It is suggested that the top sheet containing the blood modifying agent has low blood retention and can be rapidly transferred to the absorber after absorbing the blood.

[Example 4]
[Viscosity of blood containing blood modifying agents]
The viscosity of blood containing a blood modifying 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 modifying 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 modifying agent is contained.
Although blood is known to contain components such as blood cells and have thixotropic properties, the blood modifying agent of the present disclosure is considered to be able to lower the viscosity of blood in a low viscosity range. It is considered that the absorbed menstrual blood can be quickly transferred from the top sheet to the absorber by lowering the viscosity of the blood.

[Example 5]
[Micrograph of blood containing blood modifying agent]
A healthy volunteer's menstrual blood is collected on Saran Wrap (trademark), and a portion of panacet 810s dispersed in 10 times the mass of phosphate buffered saline is used, so that the concentration of panacet 810s is 1% by mass. Added to. 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 modifying agent is shown in FIG. 13 (a), and a photomicrograph of menstrual blood containing panacet 810s is shown in FIG. 13 (b).

  From FIG. 13, in menstrual blood that does not contain a blood modifying agent, red blood cells form a collective mass such as a remuneration, but in menstrual blood that includes panacet 810s, red blood cells are each stably dispersed. I understand. Therefore, it is suggested that the blood modifying agent functions to stabilize red blood cells in the blood.

[Example 6]
[Surface tension of blood containing blood modifying agents]
The surface tension of blood containing a blood modifying 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 modifying 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. 14).

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 5 below.
For the measurement, DA-505 of Kyoto Electronics Industry Co., Ltd. was used.
The results are shown in Table 5.

From Table 5 it is clear that the blood modifying agent has a water solubility of about 0.00 to about 0.05 g in 100 g of water at 25 ° C. It can be seen that the surface tension of blood can be lowered.
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 (liquid permeable sheet)
3 Back sheet (liquid impervious sheet)
4 Absorber 20 Excrement supply area (liquid supply area)
21 Stretchable region 22 Flexible region 210 Bellows

Claims (11)

An absorbent article comprising a liquid permeable sheet, a liquid impermeable sheet, and an absorber provided between the liquid permeable sheet and the liquid impermeable sheet,
A stretchable region having an expandable bellows portion and a flexible region surrounding the stretchable region are formed in a liquid supply region that receives a supply of liquid in the liquid permeable sheet ,
The absorbent article, wherein a liquid permeable hole is formed in the extensible region and a liquid permeable hole is not formed in the flexible region .   The absorbent article according to claim 1, wherein a plurality of extensible areas having an expandable bellows portion are formed in the liquid supply area, and the flexible area surrounds each extensible area.   The absorbent article according to claim 2, wherein the flexible region is formed in a mesh shape, and the stretchable region is formed inside each mesh.   The flexible region extends in a direction intersecting with the longitudinal direction of the absorbent article, and is in a direction intersecting with the first region and a substantially linear first region arranged substantially parallel to each other. The absorbent article according to claim 3, wherein the absorbent article has a substantially linear second region that is extended and juxtaposed in parallel.   The bellows portion extends in the longitudinal direction of the absorbent article, is arranged side by side in the width direction of the absorbent article, and has a mountain fold portion and a valley fold portion whose cross section along the width direction is wavy. The absorbent article of any one of Claims 1-4. The absorbent article of any one of Claims 1-5 in which the pressing groove is formed in the peripheral part of the said liquid supply area | region. A blood modifying agent, wherein the liquid permeable sheet has an IOB of 0.00 to 0.60, a melting point of 45 ° C. or less, and a water solubility of 0.00 to 0.05 g with respect to 100 g of water at 25 ° C. The absorbent article of any one of Claims 1-6 containing. The blood modifying 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 identical or different groups selected from the group consisting of: and (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 absorbent article according to claim 7 . The blood modifying agent is the following (i ′) to (iii ′):
(I ′) a 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-) selected from the group consisting of 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 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 more 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 absorbent article according to claim 7 or 8 . The blood modifying 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 that replaces 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 _2-6 alkylene glycol, or an alkyl ester or alkyl ether thereof; and (F) a chain hydrocarbon;
And it is selected from the group consisting of any combination thereof, the absorbent article according to any one of claims 7-9. The blood modifying agent comprises (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 ) a chain An ester of a hydrocarbon diol and at least one fatty acid, (b ₁ ) an ether of a chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol, (b ₂ ) a chain hydrocarbon triol and at least one aliphatic Ethers with monohydric alcohols, (b ₃ ) ethers of chain hydrocarbon diols with at least one aliphatic monohydric alcohol, (c ₁ ) chain hydrocarbon tetracarboxylic acids having 4 carboxyl groups, hydroxy acids , alkoxy acid or an oxo acid, at least one ester of an aliphatic monohydric alcohol, (c ₂₎ a chain hydrocarbon tricaprate with 3 carboxyl groups Bon acid, hydroxy acids, esters of alkoxy acids or oxoacids, and at least one aliphatic monohydric alcohol, (c ₃₎ a chain hydrocarbon dicarboxylic acids having two carboxyl groups, hydroxy 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 _2-6 alkylene glycols, (e ₂ ) esters of polyoxy C _2-6 alkylene glycols with at least one fatty acid, (e ₃ ) polyoxy Ethers of C _2-6 alkylene glycol and at least one aliphatic monohydric alcohol, (e ₄ ) polyoxy C _2- Ester of ₆ alkylene glycol and chain hydrocarbon tetracarboxylic acid, chain hydrocarbon tricarboxylic acid, or chain hydrocarbon dicarboxylic acid, (e ₅ ) polyoxy C _2-6 alkylene glycol and chain hydrocarbon tetraol , an ether of a chain hydrocarbon triol or chain hydrocarbon diol, and (f ₁₎ a chain alkane, and is selected from the group consisting of any combination thereof, any one of claims 7-10 Absorbent article as described in 1.