WO2014050412A1 - Absorbent article - Google Patents

Abstract

The present invention addresses the problem of providing an absorbent article wherein it is possible to prevent the exposure of liquid absorbed by an absorbent body. In order to solve said problem, the present invention provides a sanitary napkin (1) provided with a top sheet (2), a back sheet (3), and an absorbent body (4) disposed between the top sheet (2) and the back sheet (3), wherein: the top sheet (2) has multiple cut opening parts (51), which penetrate the top sheet (2), at least on an excretory orifice contact region (20) of a skin contact surface; the absorbent body (4) has absorbent concave parts (52) which lead to each cut opening part (51); and top sheet fragments created when forming the cut opening parts (51) cover the bottom parts (522) of the absorbent concave parts (52).

Description

Absorbent articles

The present invention relates to an absorbent article.

As a conventional absorbent article, an absorbent article in which a plurality of recesses are formed from the surface layer to the absorbent layer is known (for example, Patent Document 1).

JP 2000-333992 A

However, in the absorbent article described in Patent Document 1, since there is no surface layer on the side and bottom of the recess, the body fluid absorbed by the absorber is exposed from the bottom of the recess, causing discomfort to the wearer.

Then, an object of this invention is to provide the absorbent article which can prevent the exposure of the liquid absorbed by the absorber.

In order to solve the above problems, the present invention provides a liquid-permeable top sheet having a skin contact surface, a liquid-impermeable back sheet having a non-skin contact surface, and the top sheet and the back sheet. An absorbent article comprising: an absorbent body provided between, wherein the top sheet is provided with a plurality of cutting openings penetrating the top sheet at least on an excretory opening contact region of the skin contact surface. Said absorber has an absorber recess leading to each of said plurality of cutting openings, and a top sheet fragment produced in forming said cutting openings covers the bottom of said absorber recess The absorbent article.

According to the present invention, an absorbent article is provided which can prevent the exposure of the liquid absorbed by the absorbent.

FIG. 1 is a partially broken plan view of a sanitary napkin according to an embodiment of the absorbent article of the present invention. 2 (a) is a cross section taken along line AA of FIG. 1, and FIG. 2 (b) is a partially enlarged view of FIG. FIG. 3: is a figure for demonstrating an example of the method of forming a cutting opening part in a top sheet, and forming a recessed part in an absorber. FIG. 4A and FIG. 4B are diagrams for explaining an example of embossing. FIG. 5 is an electron micrograph of the laminate (top sheet and absorber) after embossing. FIG. 6 is an electron micrograph of the skin contact surface of the top sheet in the sanitary napkin in which the top sheet contains avian C2L oil fatty acid glyceride. FIG. 7 is a photomicrograph of menstrual blood with or without a blood slipping agent. FIG. 8 is a diagram for explaining a method of measuring surface tension.

Hereinafter, the present invention will be described.
The absorbent article according to aspect 1A is provided between a liquid-permeable top sheet having a skin contact surface, a liquid-impermeable back sheet having a non-skin contact surface, and the top sheet and the back sheet. An absorbent article, wherein the top sheet has a plurality of cutting openings penetrating the top sheet, at least in an excretory opening contact region of the skin contact surface, The absorber has an absorber recess leading to each of the plurality of cutting openings, and a top sheet fragment produced in forming the cutting openings covers the bottom of the absorber recess. It is the said absorbent article.

In a preferred aspect (Aspect 2A) of the absorbent article according to Aspect 1A, the peripheral portion of the cutting opening in the top sheet is densified.

In a preferred embodiment (Aspect 3A) of the absorbent article according to Embodiment 1A or 2A, the top sheet is composed of a plurality of layers, and the plurality of layers are crimped to each other at peripheral portions of the cutting opening.

In a preferable aspect (Aspect 4A) of the absorbent article according to any one of the aspects 1A to 3A, the absorbent material contained in the absorber is exposed from the side portion of the absorber recess.

In a preferred embodiment (Aspect 5A) of the absorbent article according to any of Embodiments 1A to 4A, the top sheet fragment is crimped to the bottom of the absorber recess.

In a preferred embodiment (Aspect 6A) of the absorbent article according to any one of Embodiments 1A to 5A, the kinematic viscosity at 40 ° C. is 0.01 to 80 mm at least in the peripheral portion of the cutting opening contact region. ^A blood slipping agent having a water-retaining rate of 0.01 to 4.0% by mass and a weight average molecular weight of less than 1,000 is applied.

In a preferred embodiment (Aspect 7A) of the absorbent article according to Embodiment 6A, the IOB of the blood slipping agent is an IOB of 0.00 to 0.60.

In a preferred embodiment (Aspect 8A) of the absorbent article according to the embodiment 6A or 7A, the blood slipping agent is any one of the following (i) to (iii):
(I) Hydrocarbons,
(Ii) from a carbonyl group (-CO-) and an oxy group (-O-) inserted between (ii-1) a hydrocarbon moiety and (ii-2) a C-C single bond of the hydrocarbon moiety A compound having one or more same or different groups selected from the group consisting of: (iii) (iii-1) a hydrocarbon moiety, and (iii-2) a C—C single bond of the hydrocarbon moiety And one or more, same or different group (s) selected from the group consisting of carbonyl group (—CO—) and oxy group (—O—) inserted between (iii-3) A compound having one or more and the same or different groups selected from the group consisting of a carboxyl group (—COOH) and a hydroxyl group (—OH) which substitutes a hydrogen atom,
And any combination thereof (wherein in the compound of (ii) or (iii), when two or more oxy groups are inserted, each oxy group is not adjacent) ).

In a preferred embodiment (Aspect 9A) of the absorbent article according to any of the Embodiments 6A to 8A, the blood slipping agent is selected from the following (i ′) to (iii ′):
(I ') hydrocarbons,
(Ii ') (ii'-1) a hydrocarbon moiety, and (ii'-2) a carbonyl bond (-CO-), an ester bond (-COO) inserted between a C-C single bond of the hydrocarbon moiety -), A compound having one or more same or different bonds selected from the group consisting of carbonate bond (-OCOO-) and ether bond (-O-), and (iii ') (iii'-) 1) A carbonyl bond (-CO-), an ester bond (-COO-), a carbonate bond (-OCOO) inserted between a hydrocarbon moiety and (iii'-2) a C-C single bond of the hydrocarbon moiety -), And one or more same or different bonds selected from the group consisting of an ether bond (-O-) and (iii'-3) a carboxyl group replacing the hydrogen atom of the hydrocarbon moiety (iii'-3) -COOH) and hydroxyl A compound having one or more, same or different groups, selected from the group consisting of sil groups (—OH),
And any combination thereof (wherein in the compound (ii ') or (iii'), when two or more identical or different bonds are inserted, each bond is adjacent) Not).

In a preferred embodiment (Aspect 10A) of the absorbent article according to any one of the Embodiments 6A to 9A, the blood slipping agent is any one of the following (A) to (F):
(A) A compound having (A1) a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms of the chain hydrocarbon moiety, (A2) a chain hydrocarbon moiety, and the chain Ester with a compound having one carboxyl group replacing the hydrogen atom of the cyclic hydrocarbon moiety,
(B) a compound having (B1) a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms of the chain hydrocarbon moiety, (B2) a chain hydrocarbon moiety, and the chain Ether with a compound having one hydroxyl group replacing the hydrogen atom of the cyclic hydrocarbon moiety,
(C) a carboxylic acid, a hydroxy acid, an alkoxy acid or an oxo acid containing a (C1) linear hydrocarbon moiety and 2 to 4 carboxyl groups replacing the hydrogen atom of the linear hydrocarbon moiety; C2) an ester of a compound having a chain hydrocarbon moiety and 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 a chain hydrocarbon moiety and a C-C single bond of the chain hydrocarbon moiety ), And a compound having any one bond selected from the group consisting of carbonate bonds (—OCOO—),
(E) Polyoxy C ₃ -C ₆ alkylene glycol, or an alkyl ester or alkyl ether thereof, and (F) a chain hydrocarbon,
And any combination thereof.

In a preferable embodiment (embodiment 11A) of the absorbent article according to any one of the embodiments 6A to 10A, the blood slipping agent is an ester of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid, (a ₂ ) Ester of linear hydrocarbon triol and at least one fatty acid, ester of (a ₃ ) linear hydrocarbon diol and at least one fatty acid, (b ₁ ) linear hydrocarbon tetraol and at least one aliphatic Ether with monohydric alcohol, ether of (b ₂ ) chain hydrocarbon triol and at least one aliphatic monohydric alcohol, ether of (b ₃ ) chain hydrocarbon diol and at least one aliphatic monohydric alcohol , (c ₁₎ chain hydrocarbon tetracarboxylic acids having 4 carboxyl groups, hydroxy acid, alkoxy acid or oxo acid, at least one aliphatic Esters of an alcohol, (c ₂₎ a chain hydrocarbon tricarboxylic acids having 3 carboxyl groups, esters of hydroxy acids, alkoxy acid or oxoacid, and at least one aliphatic monohydric alcohol, (c ₃₎ 2 (C ₁ ) aliphatic monohydric alcohol and aliphatic monohydric alcohol, ester of linear hydrocarbon dicarboxylic acid having one carboxyl group, hydroxy acid, alkoxy acid or oxo acid with at least one aliphatic monohydric alcohol With ether, (d ₂ ) dialkyl ketone, (d ₃ ) ester of fatty acid and aliphatic monohydric alcohol, (d ₄ ) dialkyl carbonate, (e ₁ ) polyoxy C ₃ -C ₆ alkylene glycol, (e ₂ ) esters of polyoxy C ₃ ~ C ₆ alkylene glycol and at least one fatty acid, (e ₃₎ polyoxy C ₃ ~ C ₆ a Sharp glycol and at least one aliphatic monohydric ethers of alcohols, and (f ₁₎ a chain alkane, and is selected from the group consisting of any combination thereof.

In a preferred embodiment (Aspect 12A) of the absorbent article according to any of Embodiments 6A to 11A, the blood slipping agent has a vapor pressure of 0.00 to 0.01 Pa at 1 atmospheric pressure and 40 ° C.

The manufacturing method according to aspect 1B is a manufacturing method of an absorbent article, including a step of embossing a laminate of a top sheet and an absorbent to form a recess penetrating the top sheet to reach the absorbent. Said manufacturing method comprising the steps of: forming the cutting opening in the top sheet; and pressing the top sheet fragment generated in forming the cutting opening onto the bottom of the recess. It is.

In a preferred embodiment (embodiment 2B) of the manufacturing method according to embodiment 1B, a protrusion roll having an outer peripheral surface provided with a plurality of protrusions and a plain roll having a smooth outer peripheral surface are used for the embossing. When the sheet passes between the projecting roll and the plain roll, the shearing force of the projection forms the cutting opening in the top sheet, and the projection is pressed into the absorber by the bottom of the recess. The top sheet fragments are crimped onto the

In the absorbent article of the present invention, two or more types of embodiments can be combined.

The type and use of the absorbent article of the present invention are not particularly limited. Examples of the absorbent articles include sanitary products and sanitary products such as sanitary napkins and panty liners, which may be humans or non-human animals such as pets. The liquid to be absorbed by the absorbent article is not particularly limited, but is mainly liquid excrement such as menstrual blood.
Hereinafter, taking a sanitary napkin as an example, an embodiment of the absorbent article of the present invention will be described based on the drawings.

A sanitary napkin 1 according to one embodiment of the absorbent article of the present invention is, as shown in FIGS. 1 and 2, a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a top sheet 2. And an absorbent body 4 provided between the back sheet 3 and a recess 5 penetrating the top sheet 2 to reach the absorbent body 4.

In FIG. 1, the X axis direction corresponds to the width direction of the sanitary napkin 1, the Y axis direction corresponds to the longitudinal direction of the sanitary napkin 1, and the direction of the plane spreading in the X axis Y axis direction corresponds to the plane direction of the sanitary napkin 1. Do. The same applies to the other figures.

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

As shown in FIG. 1, the top sheet 2 and the back sheet 3 have their longitudinal ends joined by the sealing portions 11a and 11b to form the main body 6, and the widthwise ends have the sealing portions 12a. , 12b to form substantially rectangular wing portions 7a, 7b extending in the width direction from the main body portion 6.

The shape of the main body portion 6 can be appropriately adjusted within a range that suits the wearer's body, underwear and the like, and the shape of the main body portion 6 includes, for example, a substantially rectangular shape, a substantially elliptical shape, a substantially wedge shape or the like . The longitudinal dimension of the main body portion 6 is usually 100 to 500 mm, preferably 150 to 350 mm, and the transverse dimension of the main body portion 6 is usually 30 to 200 mm, preferably 40 to 180 mm.

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

As the embossing, for example, a method in which the top sheet 2 and the back sheet 3 are combined and passed between an embossing roll having a patterned convex portion and a flat roll (a method called a so-called round seal), etc. Can be mentioned. In this method, heating of the emboss roll and / or the flat roll softens the respective sheets, so that the seal portion tends to be clear. As an embossing pattern, a lattice-like pattern, a zigzag pattern, a wavelike pattern etc. are mentioned, for example.

As a hot melt adhesive, for example, a rubber-based material such as styrene-ethylene-butadiene-styrene (SEBS), styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS) or the like, or linear Pressure-sensitive adhesives or thermosensitive adhesives mainly composed of olefins such as low density polyethylene; water-soluble polymers (eg, polyvinyl alcohol, carboxyl methyl cellulose, gelatin etc.) or water-swellable polymers (eg, polyvinyl acetate, poly And water-sensitive adhesives made of sodium acrylate etc.). As a coating method of an adhesive agent, spiral coating, coater coating, curtain coater coating, summit gun coating etc. are mentioned, for example.

As shown in FIG. 2, adhesive parts 13 a and 13 b are provided on the clothes side of the back sheet 3 forming the wing parts 7 a and 7 b, and on the clothes side of the back sheet 3 forming the main body part 6 The adhesion part 13c is provided. The sanitary napkin 1 is made by sticking the adhesive portion 13c to the crotch portion of the undergarment, bending the wing portions 7a and 7b to the outer surface side of the undergarment, and sticking the adhesive portions 13a and 13b to the crotch portion of the undergarment. It is stably fixed to the underwear.

Examples of the adhesive contained in the adhesive portions 13a, 13b and 13c include styrene-ethylene-butylene-styrene block copolymer, styrene-butylene polymer, styrene-butylene-styrene block copolymer, styrene-isobutylene- Styrene polymers such as styrene copolymer; C5 petroleum resin, C9 petroleum resin, dicyclopentadiene petroleum resin, rosin petroleum resin, polyterpene resin, tackifier such as terpene phenol resin, etc .; Monomer plasticizers such as dibutyl and dioctyl phthalate; and polymer plasticizers such as vinyl polymers and polyesters.

As shown in FIG.1 and FIG.2, the top sheet 2 has the 1st layer 21 provided in the skin contacting surface side, and the 2nd layer 22 provided in the non-skin-contacting surface side. The first layer 21 and the second layer 22 each have liquid permeability. Thereby, the top sheet 2 has liquid permeability as a whole, and can permeate liquid excrement such as menstrual blood.

One surface of the first layer 21 is a skin contact surface. The second layer 22 is laminated on the other surface of the first layer 21, and the top sheet 2 has a two-layer structure. The top sheet 2 may have one or more third layers in addition to the first layer 21 and the second layer 22. As long as the second layer 22 is provided on the non-skin contact surface side of the first layer 21, the position at which the third layer is provided is not particularly limited. For example, one or more third layers may be provided between the first layer 21 and the second layer 22, or one or more on the surface of the second layer 22 opposite to the first layer 21 side. A third layer of

The first layer 21 and the second layer 22 are not particularly limited as long as liquid excrement such as menstrual blood can be permeated. Examples of the first layer 21 and the second layer 22 include nonwoven fabrics, synthetic resin films in which liquid permeation holes are formed, and laminates of synthetic resin films and nonwoven fabrics, and the like, with preference given to nonwoven fabrics. When the top sheet 2 includes one or more third layers in addition to the first layer 21 and the second layer 22, similar ones may be mentioned as specific examples of the third layer.

Examples of the non-woven fabric include an air through non-woven fabric, a heat-bonded non-woven fabric, a spun-bonded non-woven fabric, a melt-blown non-woven fabric, a spun lace non-woven fabric, and a needle punched non-woven fabric. Examples of fibers constituting the non-woven fabric include natural fibers (such as wool and cotton), regenerated fibers (such as rayon and acetate), inorganic fibers (such as glass fibers and carbon fibers), and synthetic resin fibers (such as polyethylene, polypropylene, polybutylene, and ethylene). -Polyolefins such as vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer resin, etc .; Polyester such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polylactic acid, etc. And polyamides such as nylon). The form of the fibers constituting the non-woven fabric is, for example, composite fibers such as core-sheath type fibers, side-by-side type fibers, island / sea type fibers; hollow type fibers; flat type, Y type, C type etc Atypical fibers; three-dimensional crimped fibers of latent crimp or manifest crimp; split fibers divided by physical load such as water flow, heat, embossing, etc. may be mentioned. The fineness of the fibers constituting the non-woven fabric is preferably 1 to 20 dtex, more preferably 1.5 to 4 dtex.

The thickness, basis weight and the like of the first layer 21 and the second layer 22 can be appropriately adjusted in consideration of the formability of the recess 5 and the like. The thickness is usually 0.1 to 5 mm, preferably 0.5 to 2 mm, and the basis weight is usually 10 to 50 g / m ² , preferably 20 to 40 g / m ² .

The density of the second layer 22 is preferably larger than the density of the first layer 21. Thereby, menstrual blood transferability from the first layer 21 to the second layer 22 can be improved.

The first layer 21 and / or the second layer 22 may contain an inorganic filler such as titanium oxide, barium sulfate, calcium carbonate or the like from the viewpoint of enhancing the hiding power of the top sheet 2.

It is preferable that the first layer 21 and / or the second layer 22 be subjected to a hydrophilization treatment. As the hydrophilization treatment, for example, the surface coating of the first layer 21 and / or the second layer 22 with a hydrophilic agent, the addition of the hydrophilic agent to the component of the first layer 21 and / or the second layer 22, corona treatment, Plasma processing etc. are mentioned. When the first layer 21 and / or the second layer 22 is hydrophilized, the lipophilic region derived from the blood slipping agent and the hydrophilic region derived from the hydrophilic agent coexist in the top sheet 2 sparsely. Menstrual blood slips from the opening of the recess 5 (the cutting opening 51 formed in the top sheet 2) to the inside of the recess 5 (the absorber recess 52 formed in the absorber 4), It becomes easy to shift to the absorber 4.

The back sheet 3 is liquid impermeable. Since liquid excrement such as menstrual blood can not permeate the back sheet 3, the back sheet 3 prevents leakage of the liquid excrement absorbed by the absorber 4. One surface of the back sheet is a non-skin contact surface (in the present embodiment, a surface on which a wearer's clothing (underwear) contacts). The back sheet 3 preferably has moisture permeability in addition to liquid impermeability in order to reduce stuffiness when worn.

The back sheet 3 may be, for example, a non-woven fabric waterproofed, a synthetic resin (for example, polyethylene, polypropylene, polyethylene terephthalate etc.) film, a composite sheet of non-woven fabric and a synthetic resin film (for example non-woven fabric such as spunbond or spunlace) And a composite film in which a breathable synthetic resin film is joined, an SMS non-woven fabric in which a highly water-resistant meltblown non-woven fabric is sandwiched by a strong spunbond non-woven fabric, and the like.

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

Examples of water-absorbent fibers include wood pulps obtained from softwood or hardwood as raw materials (for example, mechanical pulps such as ground pulp, refiner ground pulp, thermomechanical pulp, chemithermomechanical pulp, etc .; kraft pulp, sulfide pulp, alkaline pulp, etc. Semi-chemical pulp, etc.); mercerized pulp obtained by subjecting wood pulp to chemical treatment or crosslinked pulp; non-wood pulp such as bagasse, kenaf, bamboo, hemp, cotton (eg cotton linters); rayon, fibril Regenerated celluloses such as rayon; semi-synthetic celluloses such as acetate and triacetate may, for example, be mentioned, but ground pulp is preferred from the viewpoint of low cost and ease of molding.

Examples of the superabsorbent material include starch-based, cellulose-based, 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, crosslinked products of sodium carboxymethylcellulose, etc. Synthetic polymers Examples of superabsorbent materials of the type include polyacrylates, polysulfonates, anhydrides maleates, polyacrylamides, polyvinyl alcohols, polyethylene oxides, polyaspartates and polyglutamates. And polyalginate-based, starch-based, and cellulose-based superabsorbent polymers (Superabsorbent Polymers: SAP), among which, among these, polyacrylate-based (especially, sodium polyacrylate-based) superabsorbent Resins are preferred. Examples of the shape of the superabsorbent material include particles, fibers, scaly and the like, and in the case of particles, the particle size is preferably 50 to 1000 μm, more preferably 100 to 600 μm. .

When the absorbent body 4 contains a highly water-absorptive material (for example, highly water-absorptive resin, highly water-absorptive fiber, etc.), the content of the highly water-absorptive material is usually 5 to 80% by mass, preferably 10 of the absorbent body 4 It is at most 60% by mass, more preferably 20 to 40% by mass.

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

The thickness, fabric weight and the like of the absorber 4 can be appropriately adjusted in accordance with the characteristics (for example, absorbability, strength, lightness, and the like) that the sanitary napkin 1 should have. The thickness of the absorber 4 is usually 0.1 to 15 mm, preferably 1 to 10 mm, more preferably 2 to 5 mm, and the basis weight is usually 20 to 1000 g / m ² , preferably 50 to 800 g / m ² , Preferably it is 100 to 500 g / m ² . In addition, the thickness of a absorber 4, a fabric weight, etc. may be constant over the absorber 4 whole, and may differ partially.

Absorbent body 4 may have a core containing an absorptive material, and a core wrap which covers a core. The core wrap is not particularly limited as long as it has liquid permeability and absorber retention. Examples of core wraps include nonwoven fabrics, woven fabrics, synthetic resin films having liquid permeation holes, and net-like sheets having a mesh. However, from the viewpoint of low cost, etc., a wet method is mainly used with crushed pulp. Tissues molded with are preferred.

As shown in FIGS. 1 and 2, the sanitary napkin 1 is formed with a plurality of recesses 5.
As shown in FIG. 2, the recess 5 penetrates the top sheet 2, extends in the thickness direction of the sanitary napkin 1, and reaches the inside of the absorbent body 4.

As shown in FIG. 1, when the sanitary napkin 1 is viewed in plan from the top sheet 2 side, the concave portion 5 is formed in the excretory opening contact area 20 of the skin contact surface of the top sheet 2. The recess 5 may be formed on substantially the entire absorbent placement area including the discharge opening contact area 20 in the skin contact surface of the top sheet 2. In addition, when the absorber arrangement | positioning area | region projects the absorber 4 on the top sheet 2, it is an area | region which the absorber 4 overlaps with the top sheet 2 (refer FIG. 1).

The excretory opening contact area 20 is an area where the wearer's excretory opening (for example, the minor labia, the labia majora, etc.) abuts when the sanitary napkin 1 is worn. As shown in FIG. 1, the excretion opening contact area 20 is set at substantially the center of the absorber placement area. The position, area, and the like of the discharge port contact region 20 can be appropriately adjusted. The discharge opening contact region 20 may be set as a region substantially identical to the region to which the discharge opening actually contacts, or may be set to a region larger than that, but the liquid discharge such as menstrual blood In order to prevent the leakage to the outside, it is preferable to set as a region larger than the region where the discharge port actually abuts. The length of the discharge port contact 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.

In the present embodiment, the excretory opening contact area 20 is set as a virtual area, but may be set as a visually recognizable area. Visual recognition can be made, for example, by coloring the excretory opening contact area 20, forming a recess in the periphery of the excretory opening contact area 20 (for example, an embossed section formed by heat embossing), or the like.

As shown in FIG. 2, the recess 5 is a cutting opening 51 passing through the top sheet 2, and an absorber recess 52 that opens in the surface of the absorber 4 on the top sheet 2 side and extends in the thickness direction of the absorber 4. And.

The recess 5 is a flow path for guiding the liquid from the cutting opening 51 to the absorber recess 52, and menstrual blood excreted from the wearer is transferred to the absorber recess 52 through the cutting opening 51, and the absorber recess is Absorbed from the side 521 and bottom 522 of 52. The formation of the cutting opening 51 improves menstrual transferability from the top sheet 2 to the absorber 4, and the formation of the absorber recess 52 increases the surface area of the surface of the absorber 4 on the top sheet 2 side. Along with this, the menstrual blood absorbability of the absorber 4 is improved. In particular, in the present embodiment, as shown in FIG. 2, since the absorbent material contained in the absorber 4 is exposed from the side portion 521 of the absorber recess 52, menstrual blood excreted from the wearer is It is easy to shift to the absorber recess 52 through the cutting opening 51 and easily absorbed from the side portion 521 of the absorber recess 52. Further, when exposed from the side portion 521 of the absorbent concavity 52, the core wrap such as pulp is broken, so that the absorbent material is less susceptible to pressure in the peripheral portion of the absorbent concavity 52, and It is easy to put out the thickness.

In the present embodiment, the recess 5 is a perforated portion formed by the perforation of the top sheet 2 and the absorber 4, and the cutting opening 51 and the absorber recess 52 are integrally formed. Therefore, as shown in FIG. 2, the absorber recess 52 is provided at a position corresponding to the position of the cutting opening 51 and is in communication with the cutting opening 51. That is, in the recess 5, the opening end of the cutting opening 51 and the opening end of the absorber recess 52 are continuous, and the opening diameter of the cutting opening 51 substantially matches the opening diameter of the absorber recess 52. ing.

When the sanitary napkin 1 is viewed in plan from the top sheet 2 side (see FIG. 1), the number of recesses 5 per 1 cm ^{2 of} the discharge port contact area 20 is preferably 0.5 to 5, and more preferably Are one to three. If the number of concave portions 5 per 1 cm ^{2 of the} excretion opening contact area 20 is smaller than 0.5, there is a possibility that the improvement effect of menstrual blood transferability and menstrual blood absorbability by the formation of the concave portions 5 does not sufficiently appear. On the other hand, if the number of recesses 5 per 1 cm ^{2 of} the excretion opening contact area 20 is larger than five, the diffusion of menstrual blood absorbed by the absorber 4 in the planar direction is prevented, and thus the absorber 4 is specified The concentration of menstrual blood in the area of (4) may cause rewet (relapse of menstrual blood once absorbed).

The opening diameter of the recess 5 (the opening diameter of the cutting opening 51, the opening diameter of the absorber recess 52) is preferably 0.3 to 6 mm, more preferably 0.6 to 3 mm. In addition, when opening shape is not circular, let the diameter of a circumscribed circle be opening diameter. When the opening diameter of the recess 5 is smaller than 0.3 mm, there is a possibility that menstrual transferability from the cutting opening 51 to the absorber recess 52 may be reduced, while if the opening diameter of the recess 5 is larger than 6 mm, the recess 5 The decrease in rigidity of the portion provided with is significantly reduced, and there is a possibility that the deflection is likely to occur when the sanitary napkin 1 is attached.

The cutting opening 51 is formed by cutting a predetermined portion of the top sheet 2 (the first layer 21 and the second layer 22). By forming the cutting opening 51, the contact area between the top sheet 2 and the skin of the wearer can be reduced, and accordingly, the friction between the top sheet 2 and the skin of the wearer can be reduced. .

During the formation of the cutting openings 51, the top sheet fragments 9 separated from the top sheet 2 result. As shown in FIG. 2, the top sheet fragments 9 formed during the formation of the cutting openings 51 cover the bottom 522 of the absorber recess 52. As a result, when the sanitary napkin 1 is viewed from the top sheet 2 side, menstrual blood absorbed by the absorbent body 4 is masked and hardly visible. The top sheet fragment 9 may cover a part of the side surface 521 of the absorber recess 52 in addition to the bottom 522 of the absorber recess 52.

The top sheet fragment 9 is preferably crimped to the bottom 522 of the absorber recess 52. As a result, the top sheet fragment 9 is consolidated integrally with the bottom 522 of the absorber recess 52, and the rigidity of the bottom 522 of the absorber recess 52 is increased, so that the recess 5 may occur when the sanitary napkin 1 is attached. And the reduction in menstrual blood transferability from the top sheet 2 to the absorber 4 due to the blockage.

The first layer 21 and the second layer 22 are preferably crimped to each other at the peripheral portion of the cutting opening 51. As a result, the peripheral portion of the cutting opening 51 is densified, and the rigidity of the peripheral portion of the cutting opening 51 is increased, so that closing of the cutting opening 51 that may occur when the sanitary napkin 1 is attached, the first layer It is possible to suppress the separation of the first and second layers 22 and the decrease in menstrual transferability from the top sheet 2 to the absorber 4 due to these. Further, due to the densification of the peripheral portion of the cutting opening 51, menstrual blood excreted from the wearer is likely to be collected at the peripheral portion of the cutting opening 51, and the menstrual blood from the cutting opening 51 to the absorbent recess 52 Migration is improved.

When forming the cutting opening 51, the top sheet 2 is compressed along with the part to be cut (the part to be the top sheet fragment 9 after cutting) and its surrounding part. By this compression, crimping of the first layer 21 and the second layer 22 in the peripheral portion of the cutting opening 51 is possible. Further, by pressure bonding the first layer 21 and the second layer 22 in the peripheral portion of the cutting opening 51, the density of the peripheral portion of the cutting opening 51 can be increased. In particular, in the case where the first layer 21 and the second layer 22 are non-woven fabrics, the first layer 21 and the second layer 22 are easily crimped to each other at the peripheral portion of the cutting opening 51. It is easy to densify the

In the surface on the back sheet 3 side of the absorber 4, it is preferable that a portion 50 facing the bottom 522 of the absorber recess 52 be separated from the back sheet 3. As a result, the absorber 4 can expand in the vicinity of the bottom 522 of the absorber recess 52, and the absorber 4 can absorb and hold menstrual blood also in the vicinity of the bottom 522 of the absorber recess 52.

The kinematic viscosity at 40 ° C. is 0.01 to 80 mm ² / s, the water retention rate is 0.01 to 4.0 mass%, and the weight average molecular weight is less than 1,000 in the discharge opening contact area 20 of the top sheet 2 The blood slipping agent which is In addition, in FIG. 1, the hatched part in the excretion opening | mouth contact | abutting area | region 20 is a part by which the blood slipping agent is coated.

The blood slipping agent will be described in detail in a separate item.

In the present embodiment, the blood slipping agent is coated on substantially the whole of the excretory opening contact region 20, but the blood slipping agent is the peripheral portion of the cutting opening 51 in the excretory opening contact region 20. It should just be coated by. As long as the blood slipping agent is coated on the periphery of the cutting opening 51 in the drainage opening abutting region 20, the blood slip imparting agent is coated on other than the periphery of the cutting opening 51 on the drainage opening abutting region 20. It may be coated, and may be applied to a region of the skin contact surface other than the discharge opening contact region 20 (for example, a peripheral region of the discharge opening contact region 20). For example, the blood slipping agent can be applied to substantially the entire skin contact surface or substantially the entire absorbent placement area.

By coating the blood slipping agent on at least the peripheral portion of the cutting opening 51 in the excretory opening contact region 20, the following effects are exhibited. When the menstrual blood excreted from the wearer reaches the excretory opening contact area 20, it slides down into the recess 5 together with the blood slipping agent present in the peripheral portion of the cutting opening 51 (ie, the absorber through the cutting opening 51) Transition to the recess 52). Therefore, the sanitary napkin 1 has an improved menstrual blood transferability from the top sheet 2 to the absorbent body 4, and the menstrual blood remaining in the top sheet 2 can be reduced. For this reason, the sticky feeling of the skin contact surface of the top sheet 2 is prevented, and a smooth feeling is maintained. The action and effect of such a blood slipping agent is exhibited regardless of the change in menstrual blood discharge during menstruation (that is, whether the amount of menstrual blood discharged at one time is large or small) .

In the present embodiment, since the recess 5 exists in the excretion opening contact region 20 and the portion where the recess 5 does not exist is relatively a protrusion, the function and effect of the blood slipping agent are effectively exhibited. Ru. In addition to the periphery of the recess 5, the action and effect of the blood slipping agent is also applied to the inner surface of the recess 5 (for example, the inner peripheral surface of the cutting opening 51, the inner surface of the absorber recess 52). It can be enhanced by coating.

In addition, since the blood slipping agent also acts as a lubricant and reduces the friction between the fibers, the flexibility of the entire top sheet 2 can be improved.

Unlike the known absorbent articles including skin care compositions, lotion compositions and the like, the sanitary napkin 1 does not require components such as an emollient and a fixing agent, and the blood slipping agent alone is a top It can be applied to the sheet 2.

The basis weight of the blood slipping agent is usually about 1 to 30 g / m ² , preferably about 2 to 20 g / m ² , and more preferably about 3 to 10 g / m ² . When the basis weight of the blood slipping agent is less than about 1 g / m ² , menstrual blood tends to remain on the top sheet 2 while when the basis weight of the blood slipping agent exceeds about 30 g / m ² , Sticky feeling is likely to increase during wearing.

The basis weight of the blood slipping agent can be measured, for example, as follows.
(1) A sample is obtained by cutting out the range to be measured of the top sheet using a sharp blade, for example, a replaceable blade of a cutter so as not to change its thickness as much as possible.
(2) Measure the area of the sample: SA (m ² ) and the mass: SM ₀ (g).
(3) The sample is stirred in a solvent capable of dissolving the blood slipping agent such as ethanol, acetone or the like for at least 3 minutes to dissolve the blood slipping agent in the solvent.
(4) The sample is filtered on the weighed filter paper, and the sample is thoroughly washed with the solvent on the filter paper. The sample on filter paper is dried in an oven at 60 ° C.
(5) The mass of the filter paper and the sample is measured, and the mass of the filter paper is reduced therefrom to calculate the mass of the sample after drying: SM ₁ (g).
(6) The basis weight BBS (g / m ² ) of the blood slipping agent is represented by the following formula:
BBS (g / m ² ) = [SM ₀ (g) -SM ₁ (g)] / SA (m ² )
Calculated by
In addition, in order to reduce an error, a plurality of samples are collected from a plurality of absorbent articles so that the total area of the samples exceeds 100 cm ² , the experiment is repeated a plurality of times, and their average value is adopted.

It is preferable that the blood slipping agent be applied so as not to close the space between the fibers of the top sheet 2. For example, the blood slipping agent adheres to the surface of the fibers of the top sheet 2 in the form of droplets or particles, or covers the surface of the fibers.

The blood slipping agent is preferably applied so as to increase the surface area. As a result, the contact area between the blood slipping agent and the menstrual blood increases, and the blood slipping agent tends to slip off with the menstrual blood. When the blood slipping agent is present in the form of droplets or particles, the surface area can be increased by decreasing the particle size.

As a coating method of the blood slipping agent, for example, a method using a coating apparatus (for example, non-contact coater such as spiral coater, curtain coater, spray coater, dip coater, contact coater, etc.) may be mentioned. . The preferred coating apparatus is a noncontact coater. As a result, the droplet-like or particulate blood-slipper can be dispersed uniformly throughout, and damage to the top sheet 2 can be reduced.

The blood slipping agent can be optionally coated as a coating solution containing a volatile solvent such as an alcohol solvent, an ester solvent, an aromatic solvent and the like. When the coating solution contains a volatile solvent, the viscosity of the coating solution containing the blood slipping agent is lowered, which facilitates the coating process, simplifies the coating process such as not requiring heating during coating, etc. It can be done.

For example, the blood slipping agent is heated at room temperature as it is, or heated to lower its viscosity, and heated at room temperature so as to liquefy in the case of a solid, to control seam HMA (Hot Melt Adhesive ) Can be coated by gun. A particulate blood slipping agent can be applied by increasing the air pressure of the control seam HMA gun. The application amount of the blood slipping agent can be adjusted, for example, by increasing or decreasing the amount of application from the control seam HMA gun.

The blood slipping agent may be applied when producing the top sheet 2 or may be applied in the production line of the sanitary napkin 1. From the viewpoint of suppressing equipment investment, it is preferable to apply a blood slipping agent on the manufacturing line of the sanitary napkin 1, and furthermore, the blood slipping agent is prevented from dropping off and contaminating the line. For this purpose, it is preferable to apply a blood slipping agent immediately downstream of the production line, specifically, immediately before enclosing the product in an individual package.

The sanitary napkin 1 may include a second sheet disposed between the top sheet 2 and the absorbent body 4 in addition to the top sheet 2 as a liquid-permeable layer. In this case, the blood slipping agent may be applied to the second sheet.

The second sheet is not particularly limited as long as liquid excrement such as menstrual blood can be permeated, and the thickness, basis weight, density, etc. of the second sheet are appropriately adjusted in the range in which liquid excrement such as menstrual blood can permeate. be able to.

Examples of the second sheet include nonwoven fabrics, woven fabrics, synthetic resin films in which liquid permeation holes are formed, and net-like sheets having a mesh. Non-woven fabrics include, for example, air-through non-woven fabrics, spun-bonded non-woven fabrics, point-bonded non-woven fabrics, spun-laced non-woven fabrics, needle-punched non-woven fabrics, melt-blown non-woven fabrics, and combinations thereof (for example, SMS etc.) etc. For example, natural fibers (wool, cotton, etc.), regenerated fibers (rayon, acetate, etc.), inorganic fibers (glass fibers, carbon fibers, etc.), synthetic resin fibers (polyethylene, polypropylene, polybutylene, ethylene-vinyl acetate copolymer, Polyolefins such as ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer resin; polyesters such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polylactic acid; De), and the like. Non-woven fabrics include core / sheath fibers, side-by-side fibers, composite fibers such as island / sea fibers; hollow fibers; flat fibers, irregular fibers such as Y-type and C-type; latent crimp or overt presence A crimped three-dimensional crimped fiber; split fibers divided by physical load such as water flow, heat, embossing, etc. may be mixed.

Next, an embodiment of a method of forming the recess 5 will be described based on FIG.

The first layer 21 unwound from the roll 120 is supplied onto the carrier sheet 110 advancing in the transport direction MD. Then, the supplied second layer 22 unrolled from the roll 130 is laminated on the first layer 21.

Recesses 144 are formed on the circumferential surface of the suction drum 140 rotating in the transport direction MD at a required pitch in the circumferential direction as a mold for packing the absorber material 142. When the suction drum 140 rotates and the concave portion 144 enters the material supply portion 141, the suction portion 146 acts on the concave portion 144, and the absorber material 142 supplied from the material supply portion 141 is vacuum suctioned to the concave portion 144. The material supply unit 141 is formed to cover the suction drum 140, and the material supply unit 141 supplies the absorber material 142 to the recess 144 by air conveyance, and the absorber 4 is formed in the recess 144. Ru. The absorber 4 formed in the concave portion 144 is transferred onto the carrier sheet 110 advancing in the transport direction MD. Thus, a laminate 152 in which the absorber 4, the second layer 22 and the first layer 21 are laminated in order is formed.

Although not shown, the carrier sheet 110 supports the laminate 152 with two belts extending on both sides in the transport direction MD. That is, of the surface on the carrier sheet side (the lower surface in FIG. 3) of the laminate 152, both side portions extending on both sides in the conveying direction MD are supported by the carrier sheet 110, but a central portion extending in the conveying direction MD Are not supported by the carrier sheet 110 and are exposed from between the two belts of the carrier sheet 110. This exposed portion is processed in the embossing process 160 in the next step. Therefore, the layered product 152 is processed by the embossing treatment 160 in the next step while being placed on the carrier sheet 110. This embodiment may be modified to end the support of the laminate 152 by the carrier sheet 110 before processing by the embossing procedure 160. In this case, the laminate 152 is not processed on the carrier sheet 110 but processed by the embossing treatment 160 in a state supported by the tension of the first layer 21 and the second layer 22. The laminate 152 may be placed on the carrier sheet 110 and conveyed again after being processed by the embossing treatment 160.

Next, the recess 5 is formed in the laminate 152 by the embossing device 160. The recess 5 is formed to extend through the first layer 21 and the second layer 22 in the thickness direction of the absorber 4 and to reach the inside of the absorber 4. Embossing device 160 includes a projecting roll 161 having a plurality of projections 161a having a needle shape, a cylindrical shape, a conical shape, and the like on the outer peripheral surface, and a plain roll 162 having a smooth surface on the outer peripheral.

When passing through the laminated body 152 between the projecting roll 161 and the plain roll 162 rotating in the transport direction MD, the projection 161 a of the projecting roll 161 forms a predetermined portion of the first layer 21 and the second layer 22 in the thickness direction , And shear the pressed portion to form the cutting opening 51. Then, the top sheet fragment 9 divided from the cutting opening 51 is pressed into the absorber 4 to form the absorber recess 52, and the top sheet fragment 9 is crimped to the bottom 522 of the absorber recess 5. Furthermore, when the protrusion 161a of the protrusion roll 161 comes out of the laminated body 152, the bottom 522 of the absorber recess 52 is pulled, and the surface of the absorber 4 on the opposite side to the surface where the absorber recess 52 opens (see FIG. A recess (not shown) (portion 50 in FIG. 2) is formed on the upper surface of the upper surface 3 at a portion facing the bottom of the absorber recess 52.

The formation process of the recessed part 5 is demonstrated in detail based on FIG. FIGS. 4A and 4B are diagrams for explaining an example of embossing.

As shown in FIG. 4A, first, the tip end of the protrusion 161 a of the protrusion roll 161 abuts on the top sheet 2. Then, the shear force of the protrusion 161 a generated when the protrusion 161 a compresses the top sheet 2 cuts the end portion (the portion represented by reference numeral 10 b) of the contact area of the protrusion 161 a. The top sheet 2 is cut by the shear force of the projections 161 a to form the top sheet fragment 9.

In order to increase the shearing force by the protrusion 161a, the height of the protrusion 161a is preferably as high as possible. Further, it is preferable that the angle of the line connecting the tip of the protrusion 161a and the root of the protrusion 161a be closer to perpendicular. That is, the angle between the side surface of the protrusion 161 a and the outer peripheral surface of the protrusion roll 161 is preferably close to 90 °. The height of the protrusion 161 a is larger than one-third the thickness of the absorber 4 before the recess 5 is formed, and ten times the thickness of the absorber 4 before the recess 5 is formed. Is preferably smaller than half the thickness of the absorber 4 before the recess 5 is formed, and is five times the thickness of the absorber 4 before the recess 5 is formed. It is further preferred that it be smaller than When the height of the protrusion 161a is smaller than 1/3 of the thickness of the absorber 4 before the recess 5 is formed, the absorber 4 is compressed in the thickness direction even in the portion where the recess 5 is not formed. The whole of the absorber 4 may become rigid. When the height of the protrusion 161a is larger than 10 times the thickness of the absorber 4 before the recess 5 is formed, the protrusion 161a may be broken. When the protrusion 161a has a cylindrical shape, the tip angle of the protrusion 161a is preferably 20 to 45 °. If the tip angle of the protrusion 161 a is smaller than 20 °, the durability of the protrusion 161 a may be reduced. If the tip angle of the protrusion 161 a is larger than 45 °, the shearing force by the protrusion 161 a may be reduced.

When the rotational speed of the protrusion roll 161 is increased, the speed at which the protrusion 161 a is pressed into the absorber 4 is increased. Therefore, by increasing the rotational speed of the projecting roll 161, the shearing force of the projection 161a can be increased.

Next, as shown in FIG. 4 (b), the protrusions 161 a of the protrusion roll 161 are pressed into the absorber 4. As a result, the top sheet piece 9 is crimped to the bottom 522 of the absorber recess 52, and is consolidated and densified integrally. Since the top sheet fragments 9 are completely separated from the main body of the top sheet 2, even if the top sheet fragments 9 receive stress from the protrusions 161a, the stress to which the top sheet 2 is subjected is weak. That is, since the tensile stress of the top sheet 2 generated when the protrusion 161 a is press-fit into the absorber 4 is weak, the absorber 4 is suppressed from being compressed in the thickness direction in the peripheral portion of the absorber recess 52.

When the protrusion 161 a is press-fit into the absorber 4, stress in the thickness direction is generated in the peripheral portion of the cutting opening 51 of the top sheet 2. Thereby, the first layer 21 and the second layer 22 are pressure-bonded to each other in the peripheral portion of the cutting opening 51 of the top sheet, and the peripheral portion of the cutting opening 51 is densified.

The electron micrograph of the laminated body 152 after embossing is shown in FIG. As shown in FIG. 5, the top sheet 2 is provided with a cutting opening 51. Since the edge (cut portion) 10 b of the cutting opening 51 of the top sheet 2 does not extend to the side surface 521 of the absorber recess 52, the cutting opening 51 corresponds to the top sheet 2 (first layer 21 and second layer). It can be seen that it was formed by cutting the layer 22) at the cutting portion 10b. In addition, at the bottom 522 of the absorber recess 52, the compressed top sheet fragment 9 is present. In the surface opposite to the surface on which the absorber recess 52 is formed, the recess 50 is formed in a portion facing the bottom of the absorber recess 52.

The side sheet 8 shown in FIG. 1 prevents menstrual blood from leaking outward in the width direction of the sanitary napkin 1 through the top sheet 2. The side sheets 8 preferably have hydrophobicity or water repellency. For the side sheet 8, for example, a spunbond nonwoven fabric, an SMS nonwoven fabric, or the like is used. Moreover, in order to contact with a wearer's skin, it is preferable to use the air through nonwoven fabric which can reduce rubbing irritation to skin as the side sheet 8. In the sanitary napkin 1, the side sheet 8 may be omitted.

<Blood lubricity imparting agent>
The blood slipping agent has a kinematic viscosity of about 0.01 to about 80 mm ² / s at 40 ° C., a water retention of about 0.05 to about 4.0% by mass, and a weight average molecular weight of about 1 Less than 1,000.

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

The kinematic viscosity is a) as the molecular weight of the blood slipping agent is increased, b) polar groups such as carbonyl bond (-CO-), ether bond (-O-), carboxyl group (-COOH), hydroxyl group The higher the ratio, such as -OH), and c) the larger the IOB, the higher the tendency.

In order to have a kinematic viscosity of about 0 to about 80 mm ² / s at 40 ° C., the melting point of the blood slipping agent is preferably 45 ° C. or less. When the blood slipping agent contains crystals at 40 ° C., the kinematic viscosity tends to be high.

Although the significance of the kinematic viscosity in the blood slipping agent will be described later, when the kinematic viscosity exceeds about 80 mm ² / s, the viscosity of the blood slipping agent is high, and the menstrual blood reached the skin contact surface of the top sheet At the same time, it tends to be difficult to slide from the convex portion to the concave portion and then to move into the inside of the absorber.

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

The water retention rate of the blood slipping agent can be appropriately adjusted in the range of about 0.01 to about 4.0% by mass, preferably about 0.02 to about 3.5% by mass, and more preferably It is about 0.03 to about 3.0% by weight, still more preferably about 0.04 to about 2.5% by weight, and still more preferably about 0.05 to about 2.0% by weight.

As used herein, "water-retaining rate" means the proportion (mass) of water that a substance can hold, and can be measured as follows.
(1) In a temperature-controlled room at 40 ° C., leave a 20 mL test tube, rubber stopper, substance to be measured and deionized water overnight.
(2) In a temperature-controlled room, 5.0 g of a substance to be measured and 5.0 g of deionized water are put into a test tube.
(3) In a temperature-controlled room, put a rubber stopper on the mouth of the test tube, rotate the test tube once, and leave it for 5 minutes.
(4) In a temperature-controlled room, 3.0 g of a layer to be measured (usually, the upper layer) is collected in a glass petri dish having a diameter of 90 mm and a weight of W ₀ (g).
(5) Heat the petri dish in an oven at 105 ° C. for 3 hours to evaporate water, measure the mass of the petri dish, and weight: W ₁ (g).
(6) Calculate the water retention rate according to the following equation.
Water holding ratio (mass%) = 100 × [W ₀ (g) -W ₁ (g)] / 3.0 (g)
The measurement is carried out three times and the average value is adopted.

Although the significance of the water retention rate in the blood slipping agent will be described later, when the water retention rate decreases, the affinity between the blood slipping agent and menstrual blood decreases and reaches the skin contact surface of the top sheet. With menstrual blood, it tends to be difficult to shift to an absorber. On the other hand, when the water retention rate becomes high, affinity with menstrual blood becomes very high like surfactants, and absorbed blood remains on the skin contact surface of the top sheet, and the skin contact of the top sheet There is a tendency for the face to be red and to be easily colored.

The water retention rate is a) as the molecular weight of the blood slipping agent decreases, and b) polar groups such as carbonyl bond (-CO-), ether bond (-O-), carboxyl group (-COOH), hydroxyl The higher the ratio of the group (-OH) or the like, the larger the value tends to be. It is because a blood slipping agent has more hydrophilicity. Also, the water retention rate tends to increase as the IOB increases, that is, as the inorganic value increases and as the organic value decreases. It is because a blood slipping agent will have more hydrophilicity.

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

When menstrual blood excreted from the wearer reaches the excretory opening contact area, it contacts the blood slipping agent present in the convex part, slides along with it into the concave part, passes through the top sheet, and transfers to the absorber .

More specifically, a blood slipping agent having a kinematic viscosity of about 0.01 to about 80 mm ² / s at 40 ° C. has a very low viscosity near the wearer's body temperature and has constant affinity with menstrual blood It is thought that menstrual blood passes through the top sheet and can be rapidly transferred to the absorbent body by using the force of sliding when the menstrual blood slides down from the convex part to the concave part and has a sliding effect. . In addition, since the blood slipping agent present in the convex portion has a water retention rate of about 0.01 to about 4.0% by mass, it is mainly compatible with hydrophilic components (such as plasma) in the blood. It is thought that menstrual blood does not easily remain on the top sheet.

Even if there is a large amount of menstrual blood excreted from the wearer, the kinetic energy of the menstrual blood itself is large, and the value of the kinematic viscosity of the blood slipping agent is relatively high and it is difficult to slip off with menstrual blood Even if the water retention rate is relatively high and the affinity with the hydrophilic component of menses is high, the weight molecular weight is relatively high and it is difficult to slide off with menstrual blood, and the top sheet Even in the case where there is no uneven structure on the skin contact surface of the above, it is considered that menstrual blood is easily transferred to the absorber.

On the other hand, when the amount of menstrual blood discharged from the wearer is small, the kinetic energy of the menstrual blood is small, and menstrual blood that has reached the skin contact surface of the top sheet tends to be easily held there. Therefore, the blood slipping agent slips along with menstrual blood from the convex part to the concave part and draws menstrual blood into the interior of the top sheet and then withdraws into the absorbent body, thereby rapidly transferring the menstrual blood to the absorbent body be able to.

The blood slipping agent has a weight average molecular weight of less than about 1,000 and preferably has a weight average molecular weight of less than about 900. When the weight-average molecular weight is about 1,000 or more, the blood slipping agent itself is tacky, which tends to make the wearer uncomfortable. In addition, when the weight average molecular weight is high, the viscosity of the blood slipping agent tends to be high, so it is difficult to lower the viscosity of the blood slipping agent to a viscosity suitable for coating by heating. As a result, the blood slipping agent may occur if it has to be diluted with a solvent.

The blood slipping agent preferably has a weight average molecular weight of about 100 or more, and more preferably about 200 or more. If the weight-average molecular weight is decreased, the vapor pressure of the blood slipping agent may be increased to be vaporized during storage, which may cause problems such as a decrease in amount and an odor when worn.

In the present specification, “weight-average molecular weight” refers to a polydispersed 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) , A concept including a single compound (for example, one fatty acid and an ester formed from one aliphatic monohydric alcohol), and a molecule having N _i molecular weights M _i (i = 1, or i In a system consisting of = 1, 2 ..., the following equation:
M _w = ΣN _i M _i ² / ΣN _i M _i
Means M _w determined by

In the present specification, the weight average molecular weight means a value in terms of polystyrene, which is determined by gel permeation chromatography (GPC).
Examples of GPC measurement conditions include the following.
Model: High-performance liquid chromatogram Lachrom Elite manufactured by Hitachi High-Technologies Corporation
Column: Showa Denko KK SHODEX KF-801, KF-803 and KF-804
Eluent: THF
Flow rate: 1.0 mL / min Implanted volume: 100 μL
Detection: RI (differential refractometer)
In addition, the weight average molecular weight described in the Example of this specification is measured based on the said conditions.

The blood slipping agent can have an IOB of about 0.00 to about 0.60.
IOB (Inorganic Organic Balance) is an index showing the balance of hydrophilicity and lipophilicity, and in the present specification, the following equation by Oda et al .:
It means the value calculated by IOB = inorganic value / organic value.

The inorganicity value and the organicity value are described in Fujida, T. 11, No. 10 (1957) p. Based on the organic conceptual diagram described in 719-725).
The organic and inorganic values of the major groups according to Mr. Fujita are summarized in Table 1 below.

For example, in the case of an ester of C14 tetradecanoic acid and C12 dodecyl alcohol, the organic value is 520 (CH ₂ , 20 × 26), and the inorganic value is 60 (-COOR, 60 ×). Therefore, IOB = 0.12.

In the blood slipping agent, the IOB is preferably about 0.00 to about 0.60, more preferably about 0.00 to about 0.50, and about 0.00 to about 0.40. More preferably, it is about 0.00 to about 0.30. When the IOB is in the above-mentioned range, the hydrostatic capacity and the kinematic viscosity tend to satisfy the above-mentioned requirements.

The blood slipping agent preferably has a melting point of 45 ° C. or less, more preferably 40 ° C. or less. When the blood slipping agent has a melting point of 45 ° C. or less, the blood slipping agent tends to have a kinematic viscosity in the range described above.

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

The blood slipping agent may be liquid or solid at room temperature (about 25 ° C.) as long as it has a melting point of about 45 ° C. or less, ie, even if the melting point is about 25 ° C. or higher, or It may be less than about 25.degree. C. and may have a melting point such as, for example, about -5.degree. C., about -20.degree.

There is no lower limit to the melting point of the blood slipping agent, but its vapor pressure is preferably low. The vapor pressure of the blood slipping agent is preferably about 0 to about 200 Pa at 25 ° C. (1 atm), more preferably about 0 to about 100 Pa, and further preferably about 0 to about 10 Pa Preferably, it is still more preferably about 0 to about 1 Pa, and even more preferably about 0.0 to about 0.1 Pa.

Considering that the absorbent article of the present disclosure is used in contact with the human body, the vapor pressure is preferably about 0 to about 700 Pa and about 0 to about 100 Pa at 40 ° C. (1 atm). Is more preferably about 0 to about 10 Pa, still more preferably about 0 to about 1 Pa, and still more preferably about 0.0 to about 0.1 Pa. If the vapor pressure of the blood slipping agent is high, it may be vaporized during storage, which may cause problems such as reduction of the amount and odor when worn.

Further, the melting point of the blood slipping agent can be selected according to the weather, the length of wearing time, and the like. For example, in areas where the average temperature is about 10 ° C. or less, menstrual blood may be excreted and then cooled by the ambient temperature by employing a blood slipping agent having a melting point of about 10 ° C. or less. Also, it is considered that the blood slipping agent is easy to function.

When the absorbent article is used for a long time, the melting point of the blood slipping agent is preferably higher in the range of about 45 ° C. or less. It is because it is hard to be influenced by sweat, friction at the time of wearing, etc., and even when it is worn for a long time, the blood slipping agent is hardly biased.

In the art, the skin contact surface of the top sheet is coated with a surfactant for the purpose of changing the surface tension of menstrual blood and the like to rapidly absorb menstrual blood. However, the surfactant-coated top sheet has high affinity with hydrophilic components (blood plasma etc.) in the blood, and tends to attract them and rather keep menstrual blood remaining on the top sheet. Unlike conventionally known surfactants, the blood slipping agent has low affinity with menstrual blood, and can be rapidly transferred to the absorber without leaving menstrual blood on the top sheet.

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

In the present specification, "hydrocarbon" means a compound consisting of carbon and hydrogen, and is a chain hydrocarbon, for example, paraffinic hydrocarbon (also referred to as alkane not containing double bond and triple bond) Olefinic hydrocarbons (containing one double bond, also referred to as alkenes), acetylenic hydrocarbons (containing one triple bond, also called alkynes), and a group consisting of double bonds and triple bonds And hydrocarbons containing two or more bonds selected from the following, as well as 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, paraffin hydrocarbon, olefin hydrocarbon, and two or more double bonds. More preferably, they are hydrocarbons containing (without triple bonds), and more preferably paraffinic hydrocarbons.
The chain hydrocarbon includes straight chain hydrocarbon and branched chain hydrocarbon.

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

Further, in the compound of (iii) above, at least one hydrogen atom of the hydrocarbon moiety is more hydroxyl group (-OH than a compound in which at least one hydrogen atom of the hydrocarbon moiety is substituted with a carboxyl group (—COOH) Compounds substituted with) are preferred. This is because the carboxyl group is bonded to a metal or the like in blood, and the water retention rate of the blood slipping agent is increased to exceed the predetermined range in some cases. This is also true from the point of view of the IOB. As shown in Table 1, since the carboxyl group binds to metals and the like in the blood, and the inorganic value greatly increases from 150 to 400 or more, the blood slipping agent having the carboxyl group is used Occasionally, the value of IOB may exceed about 0.60.

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

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

More preferably, the blood slipping agent has about 1.8 or less carbonyl bond (-CO-) and 2 or less ester bond (-COO-) per 10 carbon atoms in the hydrocarbon moiety, carbonate About 1.5 or less bonds (-OCOO-), about 6 or less ether bonds (-O-), about 0.8 or less carboxyl groups (-COOH), and / or hydroxyl groups (-OH) Or less.

More preferably, the blood slipping agent is any one of the following (A) to (F),
(A) A compound having (A1) a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms of the chain hydrocarbon moiety, (A2) a chain hydrocarbon moiety, and a chain hydrocarbon An ester with a compound having one carboxyl group replacing the hydrogen atom of the hydrogen moiety,
(B) A compound having (B1) a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms of the chain hydrocarbon moiety, (B2) a chain hydrocarbon moiety, and a chain hydrocarbon An ether with a compound having one hydroxyl group replacing the hydrogen atom of the hydrogen moiety,
(C) a carboxylic acid, hydroxy acid, alkoxy acid or oxo acid containing (C1) a chain hydrocarbon moiety and 2 to 4 carboxyl groups replacing the hydrogen atom of the chain hydrocarbon moiety, (C2 And d) an ester of a compound having a chain hydrocarbon portion and one hydroxyl group replacing a hydrogen atom of the chain hydrocarbon portion,
(D) Ether bond (-O-), carbonyl bond (-CO-), ester bond (-COO-) inserted between chain hydrocarbon moiety and C-C single bond of chain hydrocarbon moiety And a compound having any one bond selected from the group consisting of carbonate bonds (—OCOO—),
(E) Polyoxy C ₃ -C ₆ alkylene glycol, or an alkyl ester or alkyl ether thereof, and (F) a chain hydrocarbon,
And any combination thereof.
Hereinafter, the blood slipping 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 of the chain hydrocarbon moiety, (A2) a chain hydrocarbon moiety, a chain Ester with a compound having one carboxyl group replacing the hydrogen atom of the hydrocarbon moiety]
(A) A compound having (A1) a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms of the chain hydrocarbon moiety, (A2) a chain hydrocarbon moiety, a chain hydrocarbon The ester with a compound having one carboxyl group replacing the hydrogen atom of the hydrogen portion (hereinafter sometimes referred to as “compound (A)”) has the above-mentioned kinematic viscosity, water retention rate and weight average molecular weight As long as it has, not all hydroxyl groups may be esterified.

Examples of the compound (A1) having a chain hydrocarbon portion and 2 to 4 hydroxyl groups replacing the hydrogen atom of the chain hydrocarbon portion (hereinafter sometimes referred to as “compound (A1)”) include For example, linear hydrocarbon tetraols such as alkanetetraols such as pentaerythritol, linear hydrocarbon triols such as alkanetriols such as glycerin, and linear hydrocarbon diols such as alkanediols such as glycol Can be mentioned.

(A2) As a compound having a chain hydrocarbon portion and one carboxyl group replacing a hydrogen atom of the chain hydrocarbon portion, for example, one hydrogen atom on a hydrocarbon is one carboxyl group ( And -COOH) substituted compounds such as fatty acids.
Examples of the compound (A) include an ester of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid, an ester of (a ₂ ) chain hydrocarbon triol and at least one fatty acid, and (a ₃ And esters of linear hydrocarbon diols and at least one fatty acid.

[Ester of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid]
As an ester of a chain hydrocarbon tetraol and at least one fatty acid, for example, the following formula (1):

Tetraester of pentaerythritol with fatty acid, the following formula (2):

Triester of pentaerythritol with fatty acid, the following formula (3):

A diester of pentaerythritol with fatty acid, the following formula (4):

And monoesters of fatty acid with pentaerythritol.
(Wherein, R ¹ to R ⁴ are each a chain hydrocarbon)

As fatty acids (R ¹ COOH, R ² COOH, R ³ COOH, and R ⁴ COOH) constituting esters of pentaerythritol and fatty acids, esters of pentaerythritol and fatty acids have kinematic viscosity, water retention and weight average For example, saturated fatty acids such as C ₂ -C ₃₀ saturated fatty acids such as acetic acid (C ₂ ) (C ₂ represents a carbon number, R ¹ is not particularly limited as long as it satisfies the molecular weight requirements. C, R ² C, R ³ C or R ⁴ C corresponding to the carbon number of the R ⁴ C, hereinafter the same), propanoic acid (C ₃ ), butanoic acid (C ₄ ) and isomers thereof, for example, 2-methylpropanoic acid ( C ₄ ), pentanoic acid (C ₅ ) and its isomers, 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 ), Triacontanic acid (C ₃₀ ) and the like, as well as their isomers not listed.

The fatty acids can also be unsaturated fatty acids. Examples of unsaturated fatty acids include C ₃ -C ₂₀ unsaturated fatty acids, such as monounsaturated fatty acids such as crotonic acid (C ₄ ), myristoleic acid (C ₁₄ ), palmitoleic acid (C ₁₆ ), olein Acid (C ₁₈ ), elaidic acid (C ₁₈ ), vacenic acid (C ₁₈ ), gadeuric acid (C ₂₀ ), eicosenic acid (C ₂₀ ), etc., diunsaturated fatty acids such as linoleic acid (C ₁₈ ), eicosadiene Acid (C ₂₀ ), etc., triunsaturated fatty acids such as linolenic acid, eg α-linolenic acid (C ₁₈ ) and γ-linolenic acid (C ₁₈ ), pinolenic acid (C ₁₈ ), eleostearic acid, eg , Α-eleostearic acid (C ₁₈ ) and β-eleostearic acid (C ₁₈ ), meade acid (C ₂₀ ), dihomo-γ-linolenic acid (C ₂₀ ), eicosatrienoic acid (C ₂₀ ), etc. Tetra-unsaturated fatty acids, eg, stear Don acid (C _20), arachidonic acid (C _20), eicosatetraenoic acid (C _20), etc., penta unsaturated fatty acids, for example, bosseopentaenoic acid (C _18), such as eicosapentaenoic acid (C _20), as well as their Partially hydrogenated adducts of

An ester of pentaerythritol and a fatty acid is preferably an ester of pentaerythritol and a fatty acid derived from a saturated fatty acid, that is, an ester of pentaerythritol and a saturated fatty acid, considering the possibility of modification by oxidation etc. .
Moreover, as ester of pentaerythritol and fatty acid, it is preferable that it is diester, triester or tetraester from the viewpoint of reducing the value of water retention rate, and it is more preferable that it is triester or tetraester, and tetraester More preferably, it is an ester.

Considering that IOB is about 0.00 to about 0.60, in the tetraester of pentaerythritol and fatty acid, the total carbon number of fatty acids constituting the tetraester of pentaerythritol and fatty acid, ie, the above formula In (1), the total carbon number of the R ¹ C, R ² C, R ³ C and R ⁴ C moieties is preferably about 15 (when the total carbon number is 15, the IOB is 0. It becomes 60).

Examples of tetra-esters of pentaerythritol and fatty acid include pentaerythritol, hexanoic acid (C ₆ ), heptanoic acid (C ₇ ), octanoic acid (C ₈ ), such as 2-ethylhexanoic acid (C ₈ ), nonane Acid (C ₉ ), decanoic acid (C ₁₀ ) and / or tetraester with dodecanoic acid (C ₁₂ ) are mentioned.

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

From the viewpoint of setting IOB to about 0.00 to about 0.60, in the diester of pentaerythritol and fatty acid, the total carbon number of fatty acids constituting the diester of pentaerythritol and fatty acid, ie, the above formula (3) Preferably, the total carbon number of the R ¹ C and R ² C moieties is about 22 or more (when the total carbon number is 22, the IOB is 0.59).

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

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

[Ester of (a ₂ ) chain hydrocarbon triol and at least one fatty acid]
As an ester of a linear hydrocarbon triol and at least one fatty acid, for example, the following formula (5):

Triester of glycerin and fatty acid, the following formula (6):

And a diester of fatty acid with glycerin and the following formula (7):

(Wherein, each of R ⁵ to R ⁷ is a chain hydrocarbon)
And monoesters of glycerin and fatty acids.

As fatty acids (R ⁵ COOH, R ⁶ COOH and R ⁷ COOH) constituting esters of glycerin and fatty acids, esters of glycerin and fatty acids satisfy the requirements of dynamic viscosity, water retention and weight average molecular weight There is no particular limitation, and examples thereof include 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, oxidation, etc. In consideration of the possibility of modification by the above, 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.

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

The triester of glycerin and fatty acid is also referred to as 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 and two or three fatty acids, and mixtures thereof.

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

When considered from the viewpoint of setting the melting point to about 45 ° C. or less, the triester of glycerin and a fatty acid is the total carbon number of fatty acids constituting the triester of glycerin and a fatty acid, that is, in the formula (5), R ⁵ C Preferably, the sum of the carbon numbers of the R ⁶ C and R ⁷ C moieties is about 40 or less.

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

Commercial products of triester of glycerin and fatty acid include tricotic oil fatty acid glyceride, NA36, panaseto 800, panaseto 800B and panaceto 810S, and tri C2L oil fatty acid glyceride and tri CL oil fatty acid glyceride (manufactured by NOF Corporation) Etc.

The diester of glycerin and fatty acid is also referred to as diglyceride, for example, a diester of glycerin and decanoic acid (C ₁₀ ), a diester of glycerin and dodecanoic acid (C ₁₂ ), a diester of glycerin and hexadecanoic acid (C ₁₆ ) And diesters of glycerin with two fatty acids, and mixtures thereof.

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

The monoester of glycerin and fatty acid is also referred to as monoglyceride, and examples thereof include octadecanoic acid (C ₁₈ ) monoester of glycerin, docosanoic acid (C ₂₂ ) monoester of glycerin and the like.

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

[Ester of (a ₃ ) chain hydrocarbon diol and at least one fatty acid]
As an ester of a linear hydrocarbon diol and at least one fatty acid, for example, a C ₂ to C ₆ linear hydrocarbon diol, for example, a C ₂ to C ₆ glycol, such as ethylene glycol, propylene glycol, butylene glycol And mono- or diesters of pentylene glycol or hexylene glycol with a fatty acid.

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

Examples of the fatty acid to be esterified in the ester of C ₂ -C ₆ glycol and fatty acid (corresponding to R ⁸ COOH and R ⁹ COOH in formulas (8) and (9)) include C ₂ -C ₆ glycol and The ester with fatty acid is not particularly limited as long as it satisfies the requirements of dynamic viscosity, water content and weight average molecular weight, for example, “(a ₁ ) chain hydrocarbon tetraol and at least one fatty acid The fatty acids listed in "Ester", that is, saturated fatty acids and unsaturated fatty acids are mentioned, and considering the possibility of modification by oxidation etc., saturated fatty acids are preferred.

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

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

The esters of C ₂ ~ C ₆ glycols and fatty acid, in view of the potential for degradation by oxidation and the like, derived from saturated fatty acids, esters of C ₂ ~ C ₆ glycols and fatty acid, Nachi Suwa, C ₂ ~ It is preferably an ester of C ₆ glycol and a saturated fatty acid.

As esters of C ₂ -C ₆ glycols and fatty acids, esters of glycols and fatty acids derived from glycols having a large number of carbon atoms, for example, butylene glycol, pentylene, from the viewpoint of reducing the water retention rate. It is preferable that it is ester of glycol and fatty acid derived from glycol or hexylene glycol.
Furthermore, as the ester of C ₂ -C ₆ glycol and fatty acid, a diester is preferable from the viewpoint of reducing the water retention rate.
Examples of commercially available esters of C ₂ -C ₆ glycol and fatty acid include Commol BL, Commol BS (all manufactured by NOF Corporation) and the like.

[(B) a compound having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms of the chain hydrocarbon moiety, (B2) a chain hydrocarbon moiety, a chain Ether with compound having one hydroxyl group replacing hydrogen atom of hydrocarbon moiety]
(B) A compound having (B1) a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms of the chain hydrocarbon moiety, (B2) a chain hydrocarbon moiety, and a chain hydrocarbon An ether with a compound having one hydroxyl group replacing a hydrogen atom of a hydrogen portion (hereinafter sometimes referred to as “compound (B)”) has the above-mentioned kinematic viscosity, water retention rate and weight average molecular weight As long as it has, not all hydroxyl groups may be etherified.

(B1) a compound having a chain hydrocarbon portion and 2 to 4 hydroxyl groups replacing the hydrogen atom of the chain hydrocarbon portion (hereinafter, may be referred to as “compound (B1)”), Those listed as the compound (A1) in the “compound (A)” include, for example, pentaerythritol, glycerin and glycol.

Examples of (B2) a compound having a chain hydrocarbon portion and one hydroxyl group replacing a hydrogen atom of the chain hydrocarbon portion (hereinafter may be referred to as “compound (B2)”) include, for example, Compounds in which one hydrogen atom of hydrocarbon is substituted with one hydroxyl group (—OH), for example, aliphatic monohydric alcohols such as saturated aliphatic monohydric alcohols and unsaturated aliphatic monohydric alcohols It can be mentioned.

As a saturated aliphatic monohydric alcohol, for example, a C ₁ to C ₂₀ saturated aliphatic monohydric alcohol, for example, methyl alcohol (C ₁ ) (C ₁ represents a carbon number, the same applies hereinafter), ethyl alcohol (C ₂ ), propyl alcohol (C ₃ ) and its isomers such as isopropyl alcohol (C ₃ ), butyl alcohol (C ₄ ) and its isomers such as sec-butyl alcohol (C ₄ ) and tert-butyl alcohol ( C ₄ ), pentyl alcohol (C ₅ ), hexyl alcohol (C ₆ ), heptyl alcohol (C ₇ ), octyl alcohol (C ₈ ) and isomers thereof, such as 2-ethylhexyl alcohol (C ₈ ), nonyl alcohol ( C _9), decyl alcohol (C _10), dodecyl alcohol (C _12), tetradecyl alcohol (C _14), hexyl Decyl alcohol (C _16), heptadecyl alcohol (C ₁₇₎ to, octadecyl alcohol (C _18), and eicosyl alcohol (C _20), and isomers thereof that are not listed.

Examples of unsaturated aliphatic monohydric alcohols include those in which one of C—C single bonds of saturated aliphatic monohydric alcohols is substituted with C = C double bond, such as oleyl alcohol, for example, Nippon Nippon It is commercially available from Rika Co., Ltd. under the names of Rikacoll series and Angecool series.

As the compound (B), for example, an ether of (b ₁ ) chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol, for example, monoether, diether, triether and tetraether, preferably diether, triether Ethers and tetraethers, more preferably triethers and tetraethers, and still more preferably tetraethers, ethers of (b ₂ ) chain hydrocarbon triol and at least one aliphatic monohydric alcohol, such as monoethers, diethers and the like Triethers, preferably diethers and triethers, and more preferably triethers, and ethers of (b ₃ ) chain hydrocarbon diol and at least one aliphatic monohydric alcohol, such as monoethers and diethers, and preferably Diether It is below.

As the ether of a chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol, for example, the following formulas (10) to (13):

(Wherein, each of R ¹⁰ to R ¹³ is a chain hydrocarbon).
And tetraethers of pentaerythritol and aliphatic monohydric alcohols, triethers, diethers and monoethers.

Examples of ethers of chain hydrocarbon triol and at least one aliphatic monohydric alcohol include the following formulas (14) to (16):

(Wherein, R ¹⁴ to R ¹⁶ are each a chain hydrocarbon).
And triethers of glycerin and aliphatic monohydric alcohols, diethers and monoethers.

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

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

Considering that IOB is about 0.00 to about 0.60, in the triether of pentaerythritol and aliphatic monohydric alcohol, an aliphatic 1 constituting the triether of pentaerythritol and aliphatic monohydric alcohol is used. The sum of carbon number of the polyhydric alcohol, that is, the sum of carbon numbers of R ¹⁰ , R ¹¹ and R ¹² in the above formula (11) is preferably about 9 or more (when the total carbon number is 9) , The IOB is 0.57).

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

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

Further, when considering from the viewpoint of setting IOB to about 0.00 to about 0.60, in the triether of glycerin and aliphatic monohydric alcohol, an aliphatic 1 constituting the triether of glycerin and aliphatic monohydric alcohol Preferably, the sum of carbon number of the polyhydric alcohol, that is, the sum of carbon numbers of R ¹⁴ , R ¹⁵ and R ¹⁶ in the formula (14) is about 3 or more (when the total carbon number is 3) , IOB is 0.50).

In consideration of setting IOB to about 0.00 to about 0.60, in the diether of glycerin and aliphatic monohydric alcohol, carbon of aliphatic monohydric alcohol constituting diether of glycerin and aliphatic monohydric alcohol is considered. The sum of the numbers, that is, the sum of carbon numbers of R ¹⁴ and R ¹⁵ in Formula (15) is preferably about 9 or more (when the total carbon number is 9, IOB is 0.58). Become).

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

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

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

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

(C1) a linear hydrocarbon moiety and a carboxylic acid, a hydroxy acid, an alkoxy acid or an oxo acid containing 2 to 4 carboxyl groups replacing the hydrogen atom of the linear hydrocarbon moiety (hereinafter referred to as “compound (C1 )) May be, for example, a linear hydrocarbon carboxylic acid having 2 to 4 carboxyl groups, such as a linear hydrocarbon dicarboxylic acid, such as an alkane dicarboxylic acid, such as ethanedioic acid, Propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, octanedioic acid, nonanedioic acid and decanedioic acid, linear hydrocarbon tricarboxylic acids such as alkanetricarboxylic acids such as propane triacid Butane triacid, pentane triacid, hexane triacid, heptane triacid, octane triacid, nonane triacid and decane triacid, and chain hydrocarbon tetracarbo Acids such as alkane tetracarboxylic acids such as butane tetra acid, pentane tetra acid, hexane tetra acid, heptane tetra acid, octane tetra acid, octane tetra acid, nonane tetra acid and decane tetra acid.

Further, in the compound (C1), a linear hydrocarbon hydroxy acid having 2 to 4 carboxyl groups, for example, a linear chain having 2 to 4 carboxyl groups, such as malic acid, tartaric acid, citric acid, isocitric acid, etc. Hydrocarbon alkoxy acids, such as O-acetylcitric acid, and linear hydrocarbon oxoacids with 2 to 4 carboxyl groups are included.
Examples of the compound having (C2) a chain hydrocarbon portion and one hydroxyl group replacing a hydrogen atom of the chain hydrocarbon portion include those listed in the “compound (B)”, for example, fat And monohydric monohydric alcohols.

As the compound (C), an ester of (c ₁ ) chain 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, Mono-, di-, tri- and tetra-esters, preferably diesters, tri- and tetra-esters, more preferably tri- and tetra-esters, and still more preferably tetra-esters, chained with 3 (c ₂ ) 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 Be
Examples of the compound (C) include dioctyl adipate, tributyl O-acetyl citrate and the like, and are commercially available.

[(D) a linear hydrocarbon moiety and an ether bond (-O-), a carbonyl bond (-CO-), an ester bond (-COO-) inserted between the C-C single bond of the linear hydrocarbon moiety And a compound having any one bond selected from the group consisting of carbonate bonds (—OCOO—)]
(D) Ether bond (-O-), carbonyl bond (-CO-), ester bond (-COO-) inserted between chain hydrocarbon moiety and C-C single bond of chain hydrocarbon moiety , and carbonate bond (-OCOO-) compound having a any one bond selected from the group consisting of (hereinafter also referred to as "compound (D)") include, (d ₁₎ aliphatic 1 Ethers of polyhydric alcohols and aliphatic monohydric alcohols, (d ₂ ) dialkyl ketones, esters of (d ₃ ) fatty acids and aliphatic monohydric alcohols, and (d ₄ ) dialkyl carbonates can be mentioned.

[(D ₁ ) ether of aliphatic monohydric alcohol and aliphatic monohydric alcohol]
As an ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, the following formula (19):
R ¹⁹ OR ²⁰ (19)
(Wherein, R ¹⁹ and R ²⁰ are each a chain hydrocarbon)
And compounds having the formula:

As an aliphatic monohydric alcohol constituting an ether (corresponding to R ¹⁹ OH and R ²⁰ OH in the formula (19)), an ether satisfying the above-mentioned requirements for the kinematic viscosity, water content and weight average molecular weight It is not particularly limited, and examples thereof include aliphatic monohydric alcohols listed in the section "Compound (B)".

[(D ₂ ) dialkyl ketone]
As the dialkyl ketone, the following formula (20):
R ²¹ COR ²² (20)
(Wherein, each of R ²¹ and R ²² is an alkyl group)
And compounds having the formula:
The dialkyl ketone is commercially available and 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]
As an ester of a fatty acid and an aliphatic monohydric alcohol, for example, the following formula (21):
R ²³ COOR ²⁴ (21)
(Wherein each of R ²³ and R ²⁴ is a chain hydrocarbon)
And compounds having the formula:

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

Examples of esters of fatty acids and aliphatic monohydric alcohols include, for example, esters of dodecanoic acid (C ₁₂ ), dodecyl alcohol (C ₁₂ ), tetradecanoic acid (C ₁₄ ), and dodecyl alcohol (C ₁₂ ) Examples of commercially available esters of fatty acid and aliphatic monohydric alcohol include Electol WE20 and Electol WE40 (all 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)
And compounds having the formula:
In addition to being commercially available, dialkyl carbonates can be synthesized by the reaction of phosgene with alcohol, the reaction of formic acid chloride with alcohol or alcoholate, and the reaction of silver carbonate with alkyl iodide.

From the viewpoint of water retention, vapor pressure, etc., (d ₁ ) ethers of aliphatic monohydric alcohols and aliphatic monohydric alcohols, (d ₂ ) dialkyl ketones, (d ₃ ) fatty acids and aliphatic monohydric alcohols And the (d ₄ ) dialkyl carbonate, the weight average molecular weight is preferably about 100 or more, and more preferably about 200 or more.
In the case of (d ₂ ) dialkyl ketone, when the total carbon number is about 8, for example, 5-nonanone, the melting point is about −50 ° C., and the vapor pressure is about 230 Pa at 20 ° C.

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

[(E ₁ ) polyoxy C ₃ -C ₆ alkylene glycol]
Polyoxy C ₃ ~ C ₆ alkylene glycol, i) oxy C ₃ ~ C ₆ alkylene backbone, i.e., oxypropylene backbone, oxybutylene backbone, any one selected from the group consisting of oxypentylene skeleton, and oxy hexylene backbone A homopolymer having one kind of skeleton and having a hydroxy group at both ends, ii) a block copolymer having two or more kinds of skeleton selected from the above group and having a hydroxy group at both ends, or iii) the above group It means a random copolymer having two or more types of backbones selected from and having a hydroxy group at both ends.

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

As confirmed by the present inventor, polypropylene glycol (corresponding to a homopolymer of m = 3 in the formula (23)) satisfies the requirements for water retention when the weight average molecular weight is less than about 1,000. It was found not to be. Therefore, in the range of blood slipping agents, homopolymers of polypropylene glycol are not included, and propylene glycol is included in (e ₁ ) polyoxy C ₃ -C ₆ alkylene glycol as a copolymer with another glycol or a random polymer It should.

According to the present inventor's confirmation, when the weight average molecular weight is less than 1,000, the requirements for the dynamic viscosity and the water retention rate are polyethylene glycol (corresponding to a homopolymer of m = 2 in the formula (23)). It was suggested that it could not be satisfied.

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

Commercially available poly C ₃ -C ₆ alkylene glycols include, for example, Uniol (trademark) PB-500 and PB-700 (manufactured by NOF Corporation).

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

In the ester of polyoxy C ₃ -C ₆ alkylene glycol and at least one fatty acid, the fatty acid to be esterified is, for example, listed in “ester of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid”. Fatty acids, that is, saturated fatty acids or unsaturated fatty acids, and in view of the possibility of modification by oxidation etc., saturated fatty acids are preferred.

[(E ₃ ) Ether of polyoxy C ₃ -C ₆ alkylene glycol and at least one aliphatic monohydric alcohol]
The ether of polyoxy C ₃ ~ C ₆ alkylene glycol and at least one aliphatic monohydric alcohol, "(e ₁₎ polyoxy C ₃ ~ C ₆ alkylene glycol" polyoxy C ₃ ~ C ₆ alkylene glycol is described in the section of Those obtained by etherifying one or both of the OH ends of (1) with an aliphatic monohydric alcohol, ie, monoethers and diethers.
In the ether of polyoxy C ₃ -C ₆ alkylene glycol and at least one aliphatic monohydric alcohol, as aliphatic monohydric alcohol to be etherified, for example, aliphatic listed in the “compound (B)” section Monohydric alcohol is mentioned.

[(F) chain hydrocarbon]
The chain hydrocarbon includes, for example, (f ₁ ) chain alkanes, such as straight chain alkanes and branched alkanes. Linear alkanes have a carbon number of about 22 or less when the melting point is about 45 ° C. or less, and a carbon number of about 13 when the vapor pressure is about 0.01 Pa or less at 1 atmosphere and 25 ° C. It becomes above. Branched alkanes tend to have lower melting points at the same carbon number than linear alkanes. Thus, branched alkanes can also contain those having 22 or more carbons, even when the melting point is about 45 ° C. or less.
As a commercial item of hydrocarbon, for example, Pearl Reem 6 (NOF Corporation) can be mentioned.
A blood slipping agent may be coated alone on at least the convex portion 8 in the discharge port abutting region 20, or contains the blood slipping agent and at least one other component. The blood slipping agent-containing composition may be coated.

Hereinafter, the blood slipping agent-containing composition will be described. In addition, about coating of a blood slipping agent containing composition, since it is the same as coating of a blood slipping agent, description is abbreviate | omitted.

[Blood lubricity agent-containing composition]
The blood slipping agent-containing composition contains the above-described blood slipping agent and at least one other component. The other components are not particularly limited as long as they do not inhibit the action and effect of the blood slipping agent, and materials conventionally applied to absorbent articles, particularly top sheets in the art can be used. .

As other components, silicone oil, silicone, silicone resin etc. are mentioned, for example.

Other components include, for example, antioxidants, such as BHT (2,6-di-t-butyl-p-cresol), BHA (butylated hydroxyanisole), propyl gallate and the like.

Other ingredients include, for example, vitamins, such as natural or synthetic vitamins. As vitamins, for example, water-soluble vitamins, such as vitamin B group, such as vitamin B _1, vitamin B _2, vitamin B _3, vitamin B _5, vitamin B _6, vitamin B _7, vitamin B _9, Vitamin B _12, etc. And vitamin C.

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

Other components include, for example, amino acids such as, for example, alanine, arginine, lysine, histidine, proline, hydroxyproline and the like, as well as peptides.

Other components include, for example, zeolites, such as natural zeolites, such as, for example, chabazite, chabazite, fluorite, natrolite, sodalite and somsonite, as well as synthetic zeolites.

Other components include, for example, cholesterol, hyaluronic acid, lecithin, ceramide and the like.

Other components include, for example, drugs such as skin astringent agents, anti-acne agents, anti-wrinkle agents, anti-cellulite agents, skin-whitening agents, antibacterial agents, antifungal agents and the like.

Examples of the skin astringent agent include oil-soluble skin astringent agents such as zinc oxide, aluminum sulfate, tannic acid and the like, for example, oil-soluble polyphenols. Examples of oil-soluble polyphenols include natural oil-soluble polyphenols, such as, for example, ginseng extract, hypericillium extract, prickly pear extract, kamomira extract, burdock extract, salvia extract, linden extract, bromeliad extract, birch extract, cedar extract, sage extract, salvia extract, Teuchichumimi extract, hibiscus extract, loquat leaf extract, bodaiji extract, hop extract, marronier extract, yokinin extract and the like.

Examples of the anti-acne agent include salicylic acid, benzoyl peroxide, resorcinol, sulfur, erythromycin, zinc and the like.

Examples of anti-wrinkle agents include lactic acid, salicylic acid, salicylic acid derivatives, glycolic acid, phytic acid, lipoic acid and lysophosphatidic acid.

Examples of anti-cellulite agents include xanthine compounds such as aminophylline, caffeine, theophylline, theobromine and the like.

Examples of the skin lightening agent include niacinamide, kojic acid, arbutin, glucosamine and derivatives, phytosterol derivatives, ascorbic acid and its derivatives, and mulberry extract and placenta extract.

Other components include, for example, anti-inflammatory ingredients, pH adjusters, antibacterial agents, moisturizers, perfumes, dyes, dyes, pigments, plant extracts and the like.

Examples of the anti-inflammatory component include naturally-occurring anti-inflammatory agents such as, for example, button, gogon, hyperglossia, chamomile, licorice, peach tree, sage extract, etc .

Examples of pH adjusters include those for keeping the skin weakly acidic, such as malic acid, succinic acid, citric acid, tartaric acid, lactic acid and the like.

As a pigment, a titanium oxide is mentioned, for example.

The blood slipping agent-containing composition preferably comprises about 50 to about 99% by weight and about 1 to about 50% by weight, more preferably about 60% by weight of the blood slipping agent and at least one other component, respectively. To about 99 wt% and about 1 to about 40 wt%, more preferably about 70 to about 99 wt% and about 1 to about 30 wt%, still more preferably about 80 to about 99 wt% and about 1 to about 20 % By weight, still more preferably about 90 to 99% by weight and about 1 to about 10% by weight, still more preferably about 95 to 99% by weight and about 1 to about 5% by weight. It is from the viewpoint of the effect of the blood slipping agent and other components.

The blood slipping agent-containing composition preferably contains a surfactant in an amount equal to or less than the amount derived from the hydrophilization treatment of the top sheet or the second sheet. More specifically, the blood slipping agent-containing composition preferably contains a surfactant, preferably about 0.0 to about 1.0 g / m ² , more preferably about 0.0 to about 0.8 g / m 2 ² , more preferably in the range of a basis weight of about 0.1 to about 0.5 g / m ² , still more preferably about 0.1 to about 0.3 g / m ² .

This is because menstrual blood tends to remain on the top sheet as the amount of surfactant increases. The surfactant does not have a water retention value. This is because there is no layer of the substance to be measured because it is miscible with water.

The blood slipping agent-containing composition preferably contains water, preferably about 0.0 to about 1.0 g / m ² , more preferably about 0.0 to about 0.8 g / m ² , still more preferably about 0. A basis weight ranging from 1 to about 0.5 g / m ² , even more preferably from about 0.1 to about 0.3 g / m ² is included. Water is preferably low to reduce the absorption performance of the absorbent article.

The blood slipping agent-containing composition, like the blood slipping agent, preferably has a kinematic viscosity of about 0 to about 80 mm ² / s at 40 ° C. as a composition, and about 1 to about 70 mm ^2. It is more preferred to have a kinematic viscosity of ¹ / s, even more preferred to have a kinematic viscosity of about 3 to about 60 mm ² / s, and even more preferred to have a kinematic viscosity of about 5 to about 50 mm ² / s, Even more preferably, they have a kinematic viscosity of 7 to about 45 mm ² / s.

When the kinematic viscosity of the blood slipping agent-containing composition exceeds about 80 mm ² / s, the viscosity is high and the blood slipping agent composition is an absorbent article together with menstrual blood reaching the skin contact surface of the top sheet. Because it tends to be difficult to slip inside.

Where the blood slipping agent containing composition includes a component that is miscible with the blood slipping agent as at least one other component, the other components preferably have a weight average molecular weight of less than about 1,000. Preferably, it has a weight average molecular weight of less than about 900. When the weight average molecular weight is about 1,000 or more, the blood slipping agent-containing composition itself is tacky and tends to cause discomfort to the wearer. In addition, when the weight average molecular weight is high, the viscosity of the blood slipping agent-containing composition tends to increase, so that the viscosity of the blood slipping agent composition is lowered to a viscosity suitable for application by heating. Can be difficult, and as a result, the blood slipping agent may occur if it has to be diluted with a solvent.

The blood slipping agent-containing composition has, as a composition, a water retention rate of about 0.01 to about 4.0% by weight, and a water retention rate of about 0.02 to about 3.5% by weight More preferably about 0.03 to about 3.0% by weight, more preferably about 0.04 to about 2.5% by weight, and more preferably about It is further preferred to have a water retention of 0.05 to about 2.0% by weight.

When the water retention rate decreases, the affinity between the blood slipping agent composition and menstrual blood decreases, and menstrual blood that has reached the skin contact surface of the top sheet tends not to slip off inside the absorbent article. There is.
When the blood slipping agent-containing composition contains a solid, it is preferable to remove them by filtration in the measurement of the kinematic viscosity and the water retention rate.

<Test Example 1>
The blood slipping agents used in this test example are listed below.
[Ester of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid]
-Unistar H-408 BRS, manufactured by NOF Corporation, pentaerythritol tetra 2-ethylhexanoate, weight average molecular weight: about 640
Unister H-2408 BRS-22, a mixture of NOF Corporation pentaerythritol 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 SB 45 DEO, manufactured by Cognis Japan Ltd. Triester of glycerin and fatty acid in which the fatty acid is oleic acid or stearyl acid · SOY 42 manufactured by NOF Corporation C ₁₄ fatty acid: C ₁₆ fatty acid: C ₁₈ fatty acid: C ₂₀ fatty acids (including both saturated and unsaturated fatty acids) is approximately 0.2: 11: 88: contains 0.8 weight ratio, triesters of glycerin and fatty acid, the weight average molecular weight: 880

Tri C2 L oil fatty acid glyceride, manufactured by NOF Corporation C ₈ fatty acid: C ₁₀ fatty acid: C ₁₂ fatty acid is contained in a weight ratio of approximately 37: 7: 56, triester of glycerin and fatty acid, Weight average molecular weight: about 570
Triethylene CL oil fatty acid glycerides, manufactured by NOF Corporation C ₈ fatty acid: fatty acid of C ₁₂ is approximately included in a weight ratio of 44:56, triesters of glycerin and fatty acid, the weight average molecular weight: about 570

Panaceto 810s, manufactured by NOF Corporation C ₈ fatty acid: Triester of glycerin and fatty acid containing C ₁₀ fatty acid at a weight ratio of approximately 85: 15, weight average molecular weight: about 480
-Panaceto 800, manufactured by NOF Corporation Triester of glycerin and fatty acid in which all fatty acids are octanoic acid (C ₈ ), weight average molecular weight: about 470

-Panaceto 800 B, manufactured by NOF Corporation Triester of glycerin and fatty acid in which all fatty acids are 2-ethylhexanoic acid (C ₈ ), weight average molecular weight: about 470
NA36, manufactured by NOF Corporation C ₁₆ fatty acids: C ₁₈ fatty acids: C ₂₀ fatty acids (including both saturated fatty acids and unsaturated fatty acids) in a weight ratio of approximately 5: 92: 3, Triester of glycerin and fatty acid, weight average molecular weight: about 880

· Tricot oil fatty acid glyceride, manufactured by NOF Corporation C ₈ fatty acid: C ₁₀ fatty acid: C ₁₂ fatty acid: C ₁₄ fatty acid: C ₁₆ fatty acid (including both saturated fatty acid and unsaturated fatty acid) 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 diglyceride, manufactured by NOF Corporation Diester of glycerin and fatty acid wherein fatty acid is octanoic acid, weight average molecular weight: 340

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

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

[(C ₃ ) An ester of a linear 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 oil-in-oil company ester of dodecanoic acid (C ₁₂ ) and dodecyl alcohol (C ₁₂ ), weight average molecular weight: about 360
Electol WE40, an ester of tetradecanoic acid (C ₁₄ ) manufactured by NOF Corporation, and dodecyl alcohol (C ₁₂ ), weight average molecular weight: about 390

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

[(F ₁ ) chain alkane]
Pearl Reem 6, manufactured by NOF Corporation, branched hydrocarbon produced by copolymerization of 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, a triester of glycerin and fatty acid in which hydrogen is added to NA36 manufactured by NOF Corporation and the ratio of double bonds derived from unsaturated fatty acid as a raw material is reduced, weight average molecular weight: about 880
(Caprylic acid / capric acid) monoglyceride, monoester of glycerin and fatty acid, which contains octanoic acid (C ₈ ) and decanoic acid (C ₁₀ ) manufactured by NOF Corporation at a weight ratio of about 85:15, Weight average molecular weight: about 220
Monomuls 90-L2 lauric acid monoglyceride, manufactured by Cognis Japan Ltd.

Isopropyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd. Weight average molecular weight: about 230
・ Diisostearyl malate Weight average molecular weight: about 640
Uniol PB 1000 R, polybutylene glycol manufactured by NOF Corporation, weight average molecular weight: about 1,000
Uniol D-250, a polypropylene glycol manufactured by NOF Corporation, weight average molecular weight: about 250

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

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

-PEG 1500, polyethylene glycol manufactured by NOF Corporation, weight average molecular weight: about 1,500 to about 1,600
· Wilbright cp 9, a compound in which OH groups at both ends of polybutylene glycol manufactured by NOF Corporation were esterified with hexadecanoic acid (C ₁₆ ), weight average molecular weight: about 1,150
・ Unileub MS-70K, stearyl ether of polypropylene glycol manufactured by NOF Corporation, about 15 repeating units, weight average molecular weight: about 1,140

Nonion S-6, manufactured by NOF Corporation, polyoxyethylene monostearate, repeating unit of about 7 weight average molecular weight: about 880
・ Unileve 5TP-300KB
Polyoxyethylene polyoxypropylene pentaerythritol ether, weight average molecular weight: 4,130, produced by adding 5 moles of ethylene oxide and 65 moles of propylene oxide to 1 mole of pentaerythritol.

Will Bright s 753, manufactured by NOF Corporation polyoxyethylene polyoxypropylene polyoxybutylene glycerin, weight average molecular weight: about 960
-Uniol TG-330, a glyceryl ether of polypropylene glycol manufactured by NOF Corporation, about 6 repeating units, weight average molecular weight: about 330

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

・ Unirube DGP-700, a diglyceryl ether of polypropylene glycol manufactured by NOF Corporation, about 9 repeating units, weight average molecular weight: about 700
-Uniox HC60, manufactured by NOF Co., Ltd. polyoxyethylene hydrogenated castor oil, weight average molecular weight: about 3,570
・ Vaseline, Cognis Japan Ltd. Petroleum derived hydrocarbon, semi-solid

Test Example 2
[Persistence rate of menstrual blood when absorbing a large amount of blood A]
An experiment was conducted to evaluate the absorbability when the sanitary napkin absorbs a large amount of blood at one time.
A top sheet formed of an air through non-woven fabric (composite fiber consisting of polyester and polyethylene terephthalate, basis weight: 35 g / m ² ) treated with a hydrophilic agent, and an air through non-woven fabric (composite fiber consisting of polyester and polyethylene terephthalate, basis weight: 30 g) / M ² ), pulp (basis weight: 150 to 450 g / m ² , more in the central part), acrylic superabsorbent polymer (basis weight: 15 g / m ² ) and tissue as core wrap An absorbent, a water repellent-treated side sheet, and a back sheet made of polyethylene film were prepared.

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

Select Unister H-408 BRS (manufactured by NOF Corporation, tetraester of pentaerythritol and fatty acid) as a blood slipping agent, and at the room temperature, from the control seam HMA gun, the skin contact surface of the top sheet (シ ー トThe groove surface was coated at a basis weight of 5.0 g / m ² . As confirmed by electron microscopy, H-408 BRS was in the form of fine particles and adhered to the surface of the fiber.
Next, the back sheet, the absorbent body, the second sheet, and the top sheet are sequentially stacked with the ridged surface up, sanitary napkin No. 1 It formed 1-1.

The blood slipping agent was changed from Unistar H-408 BRS to that shown in Table 2, and sanitary napkin No. 1-2 to No. 1-49 were manufactured. If the blood slipping agent is liquid at room temperature, heat as it is, and if the blood slipping agent is solid at room temperature, heat to a melting point + 20 ° C, and then use a control seam HMA gun. The blood slipping agent was atomized and applied to the skin contact surface of the top sheet so that the basis weight was approximately 5 g / m ² .
In addition, the blood slipping agent was applied to almost the entire surface of the skin contact surface of the top sheet, and to both the ridges and grooves.

[Test method]
Top sheet weight: After measuring W ₂ (g) (weight of top sheet before test), an acrylic plate with holes opened on the center of the absorbent article in the longitudinal direction and width direction and on the top sheet ( Place a 200 mm × 100 mm, 125 g, 40 mm × 10 mm hole in the center, and from the above hole, equine EDTA blood at 37 ± 1 ° C. (to the blood of the horse, for prevention of coagulation ethylenediaminetetraacetic acid (In which "EDTA" was added) (4.0 g) was dropped using a pipette.

Immediately after dropping the equine EDTA blood, remove the above-mentioned acrylic plate, take out the top sheet, and measure its weight: W ₃ (g) (the weight of the top sheet after the test). (Mass%) was calculated.
Surface residual rate A (mass%)
_{= 100 × [W 3 (g} ) -W 2 (g)] / 4.0 (g)

In addition, the tackiness of the skin contact surface of the top sheet was measured at 35 ° C. according to the following criteria.
○: no tackiness △: some tackiness ×: tackiness

The surface residual rate A of each absorbent article, and the tackiness, and the properties of each blood slipping agent are shown in Table 2 below. In addition, FIG. 6 shows an electron micrograph of the skin contact surface of the top sheet in the sanitary napkin in which the top sheet contains avian C2L oil fatty acid glyceride.

Sanitary napkin No. 1 having no blood slipping agent. In 1 to 49, although the surface residual rate A was 7.5% by mass, the sanitary napkin No. 1 in which the dynamic viscosity and the water retention rate fall within the predetermined ranges. 1-1 to No. In 1-21, the surface residual ratio A was 2.5 mass% or less.

Sanitary napkin No. 1-1 to No. In 1-21, it was observed that the horse EDTA blood dropped onto the hip of the top sheet slipped from the hip to the groove and was rapidly absorbed from the groove to the inside of the absorber. On the other hand, in the sanitary napkin No. 1-49 which does not have a blood slipping agent, the dripped equine EDTA blood does not slide down to the groove, but slowly drops down to the groove, many of which fall on the ridges of the top sheet Remained in In addition, in the absorbent article having a high water retention rate, for example, in No. 1-30, equine EDTA blood dropped on the buttocks of the top sheet does not slide down in the grooves but remains partially on the top sheet Gently dripped down and some remained in the buttocks.

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

Next, No. No. 1 to No. 1 to No. 1 to No. 1 to No. 1 to No. 1 to No. 1 to No. 1 to No. 1 to No. 1 to No. 1 to No. 1-1. In the sanitary napkin containing the blood slipping agent 1-1-1-21, there is no stickiness on the top sheet even after absorbing menstrual blood, and there are many responses that the top sheet is smooth. The

In this test example, a top sheet having a ridge and groove structure manufactured according to the method described in Japanese Patent Application Laid-Open No. 2008-2034 was used, but the blood slip property imparting agent is a ridge and groove structure manufactured by another method. Also in the case of using a top sheet having the same or when using a top sheet having a concavo-convex structure other than the groin structure, the blood slipping action is similarly exhibited, and menstrual blood can be rapidly transferred from the top sheet to the absorber. It is considered possible.

<Test Example 3>
[Persistence rate of menstrual blood when absorbing a small amount of blood B]
An experiment was conducted to evaluate the absorbability when the sanitary napkin absorbs a small amount of blood.
A top sheet (hereinafter sometimes referred to as "the top sheet having ridges") formed of an air through non-woven fabric (composite fiber made of polyester and polyethylene terephthalate, basis weight: 35 g / m ² ) treated with a hydrophilic agent A second sheet formed of an air through non-woven fabric (composite fiber made of polyester and polyethylene terephthalate, basis weight: 30 g / m ² ), pulp (basis weight: 150 to 450 g / m ² , more in the central part), acrylic type An absorbent containing an absorbent polymer (basis weight: 15 g / m ² ) and a tissue as a core wrap, a water repellent-treated side sheet, and a back sheet comprising a polyethylene film were prepared.

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

Select Unister H-408 BRS (manufactured by NOF Corporation, tetraester of pentaerythritol and fatty acid) as a blood slipping agent, and at the room temperature, from the control seam HMA gun, the skin contact surface of the top sheet (シ ー トThe groove surface was coated at a basis weight of 5.0 g / m ² . As confirmed by electron microscopy, H-408 BRS was in the form of fine particles and adhered to the surface of the fiber.
Next, the back sheet, the absorbent body, the second sheet, and the top sheet are sequentially stacked with the ridged surface up, sanitary napkin No. 1 Form 2-1 (i).

Top sheet (hereinafter referred to as "flat") formed of a flat, hydrophilic agent-treated non-woven air-through non-woven fabric (composite fiber made of polyester and polyethylene terephthalate, basis weight: 35 g / m ² ) having no ridge and groove structure (Sometimes referred to as “top sheet”) except for the sanitary napkin No. In the same manner as 2-1 (i), sanitary napkin No. Form 2-1 (ii).

The blood slipping agent was changed from Unistar H-408 BRS to that shown in Table 3, and sanitary napkin No. 2-2 (i) to no. 2-11 (i) and no. 2-2 (ii) to no. 2-11 (ii) were manufactured. If the blood slipping agent is liquid at room temperature, heat as it is, and if the blood slipping agent is solid at room temperature, heat to a melting point + 20 ° C, and then use a control seam HMA gun. The blood slipping agent was atomized and applied to the skin contact surface of the top sheet so that the basis weight was approximately 5 g / m ² .
In addition, the blood slipping agent was applied to almost the entire surface of the skin contact surface of the top sheet, and in the case of the top sheet having the furrow structure, on both the groin and the groove.

[Test method]
Top sheet weight: After measuring W ₄ (g) (the weight of the top sheet before testing), 37 ± 1 ° C. horse EDTA blood on the central top sheet in the longitudinal direction and width direction of the absorbent article About 0.25 g (2 drops) was dropped from the pipette. In the top sheet having a furrow, equine EDTA blood was dropped on the top of the buttocks.

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

From Table 3, when the blood slipping agent is H-408 BRS, Panaceto 810S, capric acid diglyceride, Commopol BL, O-acetyl tributyl citrate, dioctyl adipate, Electol WE40, Uniol PB500, and Pearl Ream 6 It can be seen that the surface retention rate B is low in the top sheet having ridges. This seems to indicate that the blood slipping agent having the predetermined characteristics rapidly transferred a small amount of blood from the buttocks to the groove and the absorber.

In this test example, a top sheet having a ridge and groove structure manufactured according to the method described in Japanese Patent Application Laid-Open No. 2008-2034 was used, but the blood slip property imparting agent is a ridge and groove structure manufactured by another method. Also in the case of using a top sheet having the same or when using a top sheet having a concavo-convex structure other than the groin structure, the blood slipping action is similarly exhibited, and menstrual blood can be rapidly transferred from the top sheet to the absorber. It is considered possible.

<Test Example 4>
[Viscosity of blood containing blood slipping agent]
The viscosity of the blood containing the blood slipping agent was measured using Rheometric Expansion System ARES (Rheometric Scientific, Inc). 2% by weight of Panaceto 810s was added to equine defibrinated blood, the mixture was lightly stirred to form a sample, the sample was loaded on a parallel plate of 50 mm in diameter, the gap was made 100 μm, and the viscosity was measured at 37 ± 0.5 ° C. . Because of the parallel plate, the sample was not subjected to 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 Panaceto 810s was 5.9 mPa · s, while the viscosity of equine defibrillated blood containing no blood slipping agent was 50.4 mPa · s. Accordingly, it can be seen that equine defibrinated blood containing 2% by mass of Panaceto 810s reduces the viscosity by about 90% as compared to the case without the blood slipping agent.

Blood contains components such as blood cells and is known to have thixotropy properties, but the blood slipping agent of the present disclosure also has the effect of lowering the viscosity of blood such as menstrual blood in a low viscosity region. It is considered to have. By reducing the viscosity of blood, it is considered that absorbed menstrual blood is likely to be rapidly transferred from the top sheet to the absorber.

<Test Example 5>
[Micrograph of blood containing blood slipping agent]
A healthy volunteer's menstrual blood is collected on a food protection wrap film, and a portion of it is Panaceto 810s dispersed in 10 times the mass of phosphate buffered saline, and the concentration of Panaceto 810s is 1% by mass. It added so that it might become. The menstrual blood was applied to a slide glass, covered with a cover glass, and the condition of red blood cells was observed with a light microscope. A photomicrograph of menstrual blood containing no blood slipping agent is shown in FIG. 7 (a), and a photomicrograph of menstrual blood containing PANACET 810s is shown in FIG. 7 (b).

From FIG. 7, in the menstrual blood which does not contain the blood slipping agent, red blood cells form a lump such as ritsusen, but in menstrual blood containing PANACET 810s, the red blood cells are dispersed stably. I understand that. Therefore, it is suggested that the blood slipping agent also has the function of stabilizing red blood cells in blood.

Test Example 6
[Surface tension of blood containing blood slipping agent]
The surface tension of blood containing a blood slipping agent was measured by a pendant drop method using a contact angle meter Drop Master 500 manufactured by Kyowa Interface Science. The surface tension was measured after adding a predetermined amount of a blood slipping agent to sheep defibrinated blood and shaking sufficiently.
The measurement is automatically performed by the device, but the surface tension γ is obtained by the following equation (see FIG. 8).

γ = g × ρ × (de) ² × 1 / H
g: Gravitational constant 1 / H: correction term obtained from ds / de ρ: density de: maximum diameter ds: diameter at a position de up from the dropping end

The density ρ is 5 of “density test method and density / mass / volume conversion table” of JIS K 2249-1995. It was measured at the temperature shown in Table 4 below according to the vibrational density test method.
For measurement, DA-505 of Kyoto Electronics Industries Ltd. was used.
The results are shown in Table 4 below.

It can be seen from Table 4 that the blood slipping agent also has the effect of lowering the surface tension of blood.
By lowering the surface tension of the blood, it is considered that the absorbed blood can be rapidly transferred to the absorber without being held between the fibers of the top sheet.

1 Sanitary napkin (absorbent article)
2 Top sheet (liquid permeable layer)
3 Back sheet (liquid impermeable layer)
4 Absorber 20 Discharge port contact area 51 Cutting opening 52 Absorber recess 522 Bottom of absorber recess

Claims (14)

1. A liquid-permeable top sheet having a skin-contacting surface, a liquid-impermeable back sheet having a non-skin-contacting surface, and an absorbent comprising an absorber provided between the top sheet and the back sheet Sexual goods,
   The top sheet has a plurality of cutting openings penetrating the top sheet at least in the excretory opening contact region of the skin contact surface,
   The absorber has an absorber recess leading to each of the plurality of cutting openings;
   The absorbent article, wherein the top sheet fragment generated in forming the cutting opening covers the bottom of the absorber recess.
2. The absorbent article according to claim 1, wherein a peripheral portion of the cutting opening in the top sheet is densified.
3. The absorbent article according to claim 1 or 2, wherein the top sheet is composed of a plurality of layers, and the plurality of layers are crimped to each other at a peripheral portion of the cutting opening.
4. The absorbent article according to any one of claims 1 to 3, wherein the absorbent material contained in the absorber is exposed from the side of the absorber recess.
5. The absorbent article according to any one of claims 1 to 4, wherein the top sheet fragment is crimped to the bottom of the absorber recess.
6. The kinematic viscosity at 40 ° C. is 0.01 to 80 mm ² / s, the water retention rate is 0.01 to 4.0 mass%, and the weight average molecular weight at least in the periphery of the cutting opening in the discharge port contact area The absorbent article according to any one of claims 1 to 5, wherein a blood slipping agent having a value of less than 1,000 is applied.
7. The absorbent article according to claim 6, wherein the blood slipping agent IOB is an IOB of 0.00 to 0.60.
8. The blood slipping agent may be any of the following (i) to (iii):
   (I) Hydrocarbons,
   (Ii) from a carbonyl group (-CO-) and an oxy group (-O-) inserted between (ii-1) a hydrocarbon moiety and (ii-2) a C-C single bond of the hydrocarbon moiety A compound having one or more same or different groups selected from the group consisting of: (iii) (iii-1) a hydrocarbon moiety, and (iii-2) a C—C single bond of the hydrocarbon moiety And one or more, same or different group (s) selected from the group consisting of carbonyl group (—CO—) and oxy group (—O—) inserted between (iii-3) A compound having one or more and the same or different groups selected from the group consisting of a carboxyl group (—COOH) and a hydroxyl group (—OH) which substitutes a hydrogen atom,
   And selected from the group consisting of any combination thereof,
   Here, in the compound (ii) or (iii), when two or more oxy groups are inserted, each oxy group is not adjacent,
   The absorbent article according to claim 6 or 7.
9. The blood slipping agent may be any of the following (i ') to (iii'):
   (I ') hydrocarbons,
   (Ii ') (ii'-1) a hydrocarbon moiety, and (ii'-2) a carbonyl bond (-CO-), an ester bond (-COO) inserted between a C-C single bond of the hydrocarbon moiety -), A compound having one or more same or different bonds selected from the group consisting of carbonate bond (-OCOO-) and ether bond (-O-), and (iii ') (iii'-) 1) A carbonyl bond (-CO-), an ester bond (-COO-), a carbonate bond (-OCOO) inserted between a hydrocarbon moiety and (iii'-2) a C-C single bond of the hydrocarbon moiety -), And one or more same or different bonds selected from the group consisting of an ether bond (-O-) and (iii'-3) a carboxyl group replacing the hydrogen atom of the hydrocarbon moiety (iii'-3) -COOH) and hydroxyl A compound having one or more, same or different groups, selected from the group consisting of sil groups (—OH),
   And selected from the group consisting of any combination thereof,
   Here, in the compound (ii ') or (iii'), when two or more identical or different bonds are inserted, each bond is not adjacent,
   The absorbent article according to any one of claims 6 to 8.
10. The blood slipping agent may be any of the following (A) to (F):
    (A) A compound having (A1) a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms of the chain hydrocarbon moiety, (A2) a chain hydrocarbon moiety, and the chain Ester with a compound having one carboxyl group replacing the hydrogen atom of the cyclic hydrocarbon moiety,
    (B) a compound having (B1) a chain hydrocarbon moiety and 2 to 4 hydroxyl groups replacing hydrogen atoms of the chain hydrocarbon moiety, (B2) a chain hydrocarbon moiety, and the chain Ether with a compound having one hydroxyl group replacing the hydrogen atom of the cyclic hydrocarbon moiety,
    (C) a carboxylic acid, a hydroxy acid, an alkoxy acid or an oxo acid containing a (C1) linear hydrocarbon moiety and 2 to 4 carboxyl groups replacing the hydrogen atom of the linear hydrocarbon moiety; C2) an ester of a compound having a chain hydrocarbon moiety and 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 a chain hydrocarbon moiety and a C-C single bond of the chain hydrocarbon moiety ), And a compound having any one bond selected from the group consisting of carbonate bonds (—OCOO—),
    (E) Polyoxy C ₃ -C ₆ alkylene glycol, or an alkyl ester or alkyl ether thereof, and (F) a chain hydrocarbon,
    The absorbent article according to any one of claims 6 to 9, selected from the group consisting of and any combination thereof.
11. The blood slipping agent is an ester of (a ₁ ) chain hydrocarbon tetraol and at least one fatty acid, an ester of (a ₂ ) chain hydrocarbon triol and at least one fatty acid, (a ₃ ) chain Of a cyclic hydrocarbon diol and at least one fatty acid, an ether of (b ₁ ) a linear hydrocarbon tetraol and at least one aliphatic monohydric alcohol, (b ₂ ) a linear hydrocarbon triol and at least one fatty Ether with a monohydric monohydric alcohol, ether of (b ₃ ) chain hydrocarbon diol and at least one aliphatic monohydric alcohol, chain hydrocarbon tetracarboxylic acid having (c ₁ ) 4 carboxyl groups, hydroxy acid, alkoxy acid or an oxo acid, at least one ester of an aliphatic monohydric alcohol, (c ₂₎ a chain hydrocarbon bets with 3 carboxyl groups Carboxylic acid, hydroxy acid, alkoxy acid or an oxo acid, at least one ester of an aliphatic monohydric alcohol, (c ₃₎ a chain hydrocarbon dicarboxylic acids having two carboxyl groups, hydroxy acid, alkoxy acid or an oxo An ester of an acid and at least one aliphatic monohydric alcohol, (d ₁ ) an ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, (d ₂ ) a dialkyl ketone, (d ₃ ) a fatty acid and an aliphatic 1 Esters with dihydric alcohols, (d ₄ ) dialkyl carbonates, (e ₁ ) polyoxy C ₃ -C ₆ alkylene glycols, (e ₂ ) esters of polyoxy C ₃ -C ₆ alkylene glycols with at least one fatty acid, (e ₃ ) Ethers of polyoxy C ₃ -C ₆ alkylene glycol and at least one aliphatic monohydric alcohol, and (f ₁ The absorbent article according to any one of claims 6 to 10, selected from the group consisting of chain alkanes, and any combination thereof.
12. The absorbent article according to any one of claims 6 to 11, wherein the blood slipping agent has a vapor pressure of 0.00 to 0.01 Pa at 1 atm and 40 属 C.
13. A method of manufacturing an absorbent article, comprising the steps of embossing a laminate of a top sheet and an absorbent to form a recess penetrating the top sheet to the absorbent.
    The manufacturing method, wherein the embossing includes forming a cutting opening in the top sheet, and pressing a top sheet fragment generated in forming the cutting opening onto a bottom of the recess.
14. In the embossing process, a projecting roll having an outer circumferential surface provided with a plurality of projections and a plain roll having a smooth outer circumferential surface are used, and the laminate passes between the projecting roll and the plain roll. The shear force of the protrusion forms the cutting opening in the top sheet, and the top sheet fragment is crimped to the bottom of the recess by press-fitting the protrusion into the absorber. Method of producing an absorbent article.

Images