WO2023068013A1

WO2023068013A1 - Absorbent article

Info

Publication number: WO2023068013A1
Application number: PCT/JP2022/036622
Authority: WO
Inventors: 雄太郎水越; 貴史白川
Original assignee: 花王株式会社
Priority date: 2021-10-21
Filing date: 2022-09-30
Publication date: 2023-04-27
Also published as: JP2023062611A; JP7431205B2

Abstract

An absorbent article (1) has leak-proof cuffs (3) each extending longitudinally on both side regions in a transverse direction Y. The leak-proof cuffs (3) are composed of a leak-proof cuff-forming sheet (30) comprising at least a non-woven fabric. Constituent fibers of the non-woven fabric includes a triglyceride. The triglyceride is: (a) a mixture of a triglyceride containing at least a group derived from a fatty acid having 16 carbon atoms in one molecule, and a triglyceride containing at least a group derived from a fatty acid having 18 carbon atoms in one molecule; or (b) a triglyceride containing at least a group derived from a fatty acid having 16 carbon atoms and a group derived from a fatty acid having 18 carbon atoms in one molecule.

Description

absorbent article

The present invention relates to various absorbent articles such as disposable diapers and sanitary napkins.

Various absorbent articles, including disposable diapers, are known to have leak-preventing members called leak-preventing cuffs or three-dimensional gathers. Such a member is provided on the skin-facing side of the absorbent article for the purpose of damming excrement such as stool to prevent leakage.

For example, when stool is blocked by the leak-proof cuff, the stool adheres to the leak-proof cuff, and the adhered stool may be seen through the leak-proof cuff. Such a situation may cause the wearer to feel uneasy about leakage around the leg, and may impose a mental burden on the wearer.
In particular, when the amount of excretion is large, stool may climb over the leak-proof cuff and leak out. It may seep outside the leakage cuff. In these situations, the feces become more visible from the outside, which not only makes the wearer more mentally uneasy about leakage, but also causes physical problems, such as the need to deal with clothing stains caused by the leakage of feces. burden will also increase.

Patent Document 1 describes an absorbent article in which glycerol tristearate is contained in barrier leg cuffs arranged around the wearer's legs. According to this absorbent article, it is described in the same document that the penetration of the barrier leg cuffs against low surface tension liquid is less likely to occur.

WO2014/150303A1

TECHNICAL FIELD The present invention relates to an absorbent article having leak-proof cuffs extending in the longitudinal direction on both side regions in the lateral direction.
The leak-preventing cuff is composed of a sheet for forming a leak-preventing cuff containing at least a non-woven fabric.
The constituent fibers of the nonwoven fabric contain triglycerides.
The triglyceride is
(a) a mixture of a triglyceride containing at least a group derived from a fatty acid having 16 carbon atoms in one molecule and a triglyceride containing at least a group derived from a fatty acid having 18 carbon atoms in one molecule, or (b) carbon It is a triglyceride containing at least a fatty acid-derived group having 16 atoms and a fatty acid-derived group having 18 carbon atoms in one molecule.

FIG. 1 is a cross-sectional view in the thickness direction along the lateral direction of the crotch part in an unfolded and stretched state of the absorbent article of the present invention. FIG. 2 is a cross-sectional view schematically showing a state in which the anti-leakage cuff is erected in FIG. FIG. 3 is a cross-sectional view (equivalent to FIG. 1) showing another embodiment of the absorbent article of the present invention.

Detailed description of the invention

As a result of examination by the present inventor, it was found that even when the barrier leg cuff described in Patent Document 1 is used, it is insufficient to prevent exudation of excrement.
Accordingly, the present invention relates to an absorbent article having a leak-proof cuff capable of preventing seepage of excrement.

The present invention will be described below based on its preferred embodiments. The absorbent article of the present invention generally has a vertically long shape having a longitudinal direction corresponding to a direction extending from the wearer's abdomen to the dorsal side through the crotch and a lateral direction orthogonal thereto. The absorbent article has a crotch portion arranged in the crotch portion of the wearer, and an abdominal portion and a dorsal portion extending in the front and rear of the crotch portion. The crotch part has an excretion-part facing part that is arranged to face the wearer's excretion part when the absorbent article is worn, and the excretion part-facing part is usually at or near the longitudinal center of the absorbent article. located in

An absorbent article generally comprises a topsheet positioned on the wearer's skin-facing side, a backsheet positioned on the non-skin-facing side, and an absorbent body interposed between the two sheets. As the surface sheet, a liquid-permeable sheet such as a nonwoven fabric or a perforated film can be used. The surface sheet may have an uneven surface on the side facing the skin. For example, a plurality of projections can be formed in a scattered pattern on the side of the surface facing the skin of the topsheet. Alternatively, ridges and grooves extending in one direction may be alternately formed on the surface of the topsheet facing the skin. For such purposes, two or more nonwoven fabrics may be used to form the topsheet.

On the other hand, as the back sheet, for example, a liquid-impermeable film or a spunbond-meltblown-spunbond laminated nonwoven fabric can be used. A plurality of micropores may be provided in the liquid-impermeable film to impart water vapor permeability to the film. For the purpose of further improving the feel of the absorbent article, a sheet having good texture such as a non-woven fabric may be laminated on the outer surface of the backsheet.

The absorber has an absorbent core. The absorbent core is, for example, a pile of hydrophilic fibers such as pulp and cellulose, a mixed pile of hydrophilic fibers and absorbent polymer, a pile of absorbent polymer, and between two absorbent sheets. It is composed of a laminated structure in which an absorbent polymer is carried in the body. At least the skin-facing surface of the absorbent core may be covered with a liquid-permeable core-wrap sheet, or the entire surface including the skin-facing surface and the non-skin-facing surface may be covered with the core-wrap sheet. . As the core wrap sheet, for example, a thin paper made of hydrophilic fibers, a liquid-permeable nonwoven fabric, or the like can be used.

In addition to the above-described topsheet, backsheet, and absorbent body, the absorbent article is provided with longitudinally extending leak-proof cuffs on both sides along the longitudinal direction on the side facing the skin. A leak-tight cuff generally has a proximal end and a free end. The leak-proof cuff has a base end on the skin-facing side of the absorbent article and stands up from the skin-facing side. As will be described later, the leak-proof cuff is made of a liquid-resistant sheet for forming a leak-proof cuff. Also, as will be described later, an elastic member may be arranged in a stretched state at or near the free end of the leak-proof cuff. When the absorbent article is worn, the contraction of the elastic member causes the leakage-preventing cuff to stand up toward the wearer's body, and the liquid excreted on the topsheet flows along the topsheet and becomes absorbent. Laterally outward leakage of the article is effectively prevented. Details of the leak-proof cuff will be described later.

In the present specification, the term "leakage" refers to excretion excreted on the surface sheet overcoming the leakage-preventing cuff and flowing outward in the lateral direction.

The absorbent article may have an adhesive layer on the non-skin facing surface depending on its specific use. The pressure-sensitive adhesive layer is used to fix the absorbent article to underwear or another absorbent article while the absorbent article is worn.

Absorbent articles having the above configuration include, but are not limited to, unfoldable disposable diapers, underpants-type disposable diapers, sanitary napkins, incontinence pads, panty liners, and the like.

As described above, the leak-proof cuff is composed of a sheet for forming a leak-proof cuff (hereinafter also simply referred to as "leak-proof cuff sheet"). The leak-proof cuff sheet contains at least a non-woven fabric. The leak-proof cuff sheet may be composed only of nonwoven fabric, or may be composed of a laminated sheet containing nonwoven fabric and other sheet materials. Laminated sheets include, for example, laminated sheets containing a nonwoven fabric and a resin film. From the viewpoint of imparting breathability to the leak-preventive cuff, the leak-preventive cuff sheet is preferably composed only of nonwoven fabric. In particular, it is preferable that the leak-proof cuff sheet is composed only of a water-repellent nonwoven fabric.

As the nonwoven fabric forming the leak-proof cuff sheet, those manufactured by various methods can be used. Various methods are known for producing nonwoven fabrics, such as the meltblown method, the spunbond method, the air-through method, the airlaid method, the spunlace method, the needle punch method, the electrospinning method, the chemical bond method, and the thermal bond method. The nonwoven fabrics of the present invention include those produced by these methods. However, the nonwoven fabrics are not limited to these, and nonwoven fabrics produced by methods other than these, and laminated nonwoven fabrics in which two or more of these nonwoven fabrics are combined can also be used. For example, spunbond-meltblown nonwoven fabric (hereinafter also referred to as “SM nonwoven fabric”), spunbond-meltblown-spunbond nonwoven fabric (hereinafter also referred to as “SMS nonwoven fabric”), spunbond-meltblown-meltblown-spunbond nonwoven fabric (hereinafter referred to as “SMMS”) Non-woven fabric") is suitable as a non-woven fabric constituting the leak-proof cuff sheet because of its high liquid resistance.

In particular, the nonwoven fabric constituting the leak-proof cuff sheet preferably contains a meltblown nonwoven fabric from the viewpoint of enhancing liquid resistance. For example, it is preferable that the leak-proof cuff sheet is composed only of a meltblown nonwoven fabric, or composed of a nonwoven fabric containing a meltblown nonwoven fabric, such as an SM nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric.
Meltblown nonwoven fabric exhibits high liquid resistance due to the small fiber diameter of its constituent fibers due to its manufacturing method. The fiber diameter of the constituent fibers of the meltblown nonwoven fabric is preferably 0.1 μm or more and 10 μm or less, more preferably 0.3 μm or more and 7 μm or less, and still more preferably 0.5 μm or more and 5 μm or less.
The fiber diameter of the constituent fibers of the meltblown nonwoven fabric is measured by the following method. A small piece sample is taken from the meltblown nonwoven fabric, gold vapor deposition is performed on the sample for 2 minutes, and then the fiber diameter is directly measured for 70 randomly selected fibers using a scanning electron microscope. The average value (two significant figures) of the measured values is taken as the fiber diameter of the constituent fibers of the meltblown nonwoven fabric. When the leak-proof cuff sheet is composed of nonwoven fabrics including meltblown nonwoven fabrics such as SM nonwoven fabrics, SMS nonwoven fabrics, and SMMS nonwoven fabrics, the small piece sample is collected at a stage in which meltblown nonwoven fabrics can be collected among the manufacturing stages of these nonwoven fabrics. Alternatively, if possible, the surface of the SMS nonwoven fabric or the like may be observed with a scanning electron microscope, and the fibers of the meltblown nonwoven fabric may be directly observed to measure the fiber diameter.

Melt-blown non-woven fabrics, regardless of whether the non-woven fabrics constituting the leak-proof cuff sheets are composed only of melt-blown non-woven fabrics or non-woven fabrics including melt-blown non-woven fabrics such as SM non-woven fabrics, SMS non-woven fabrics and SMMS non-woven fabrics. is preferably 1 g/m ² or more, more preferably 1.5 g/m ^{2 or more, and 2 g/m 2} ^or more, from the viewpoint of increasing the liquid resistance of the leak-proof cuff 3. is more preferable. In addition, the basis weight of the meltblown nonwoven fabric is preferably 10 g/m ² or less, more preferably 7 g/m ² or less, and more preferably 5 g/m 2 or less, from the viewpoint of improving the touch and softness of the leak-proof cuff 3 . It is more preferably m ² or less. Considering these viewpoints, the basis weight of the meltblown nonwoven fabric is preferably 1 g/m ² or more and 10 g/m ² or less, more preferably 1.5 g/m ² or more and 7 g/m ² or less, and 2 g /m ² or more and 5 g/m ² or less.
The grammage of the meltblown nonwoven fabric is calculated by dividing the average value of the mass measured for five pieces of at least 10 mm square measurement pieces taken from the nonwoven fabric by the area of the measurement pieces. When the leak-proof cuff sheet is composed of nonwoven fabrics including meltblown nonwoven fabrics such as SM nonwoven fabrics, SMS nonwoven fabrics and SMMS nonwoven fabrics, the measurement piece is collected at a stage in which meltblown nonwoven fabrics can be collected among the production stages of these nonwoven fabrics. Alternatively, the SMS nonwoven fabric may be separated into individual layers using means such as peeling, and the basis weight of the meltblown nonwoven fabric may be measured.

When the nonwoven fabric constituting the leak-proof cuff sheet is a laminated nonwoven fabric containing at least a spunbond nonwoven fabric and a meltblown nonwoven fabric, the mass ratio of the spunbond nonwoven fabric to the total mass of the nonwoven fabric is 50% by mass or more and 95% by mass or less. It is preferable from the viewpoint of improving the property of preventing exudation of excrement. From the viewpoint of making this advantage more remarkable, the mass ratio of the spunbond nonwoven fabric to the total mass of the nonwoven fabric is more preferably 50% by mass or more and 92.5% by mass or less, and more preferably 50% by mass or more and 90% by mass or less. More preferably.
On the other hand, the mass ratio of the meltblown nonwoven fabric to the total mass of the nonwoven fabric is preferably 5% by mass or more and 50% by mass or less from the viewpoint of improving the ooze prevention of excrement. From the viewpoint of making this advantage more remarkable, the mass ratio of the meltblown nonwoven fabric to the total mass of the nonwoven fabric is more preferably 7% by mass or more and 50% by mass or less, and more preferably 10% by mass or more and 50% by mass or less. More preferred.

No matter what method the non-woven fabric that constitutes the leak-proof cuff sheet is manufactured by, the fibers that constitute the non-woven fabric contain a thermoplastic resin having fiber-forming ability and triglyceride, which will be described later. Various thermoplastic resins having fiber-forming properties are known in the art, and in the present invention, the use of a polyolefin resin as the thermoplastic resin provides a nonwoven fabric highly resistant to exudation of excrement. It is preferable from the viewpoint of obtaining

As the polyolefin resin, for example, homopolymers and copolymers of lower olefins such as ethylene and propylene can be used. Specific examples include polyethylene, polypropylene and ethylene-α-olefin copolymers.
Examples of polyethylene include high density polyethylene, low density polyethylene and linear low density polyethylene.
Polypropylene includes isotactic polypropylene and syndiotactic polypropylene. Moreover, low stereoregularity homopolypropylene can also be used as polypropylene. Low stereoregular homopolypropylene is homopolypropylene having a mesopentad fraction (mmmm [%]) of 90% or less as measured by 13C-NMR, which is an index of stereoregularity.
Ethylene-α-olefin copolymers include copolymers of ethylene and α-olefins such as propylene, 1-butene, 1-pentene and 1-hexene. Examples of copolymers include random copolymers, block copolymers and graft copolymers. In particular, it is preferable to use a random copolymer of ethylene and propylene (hereinafter also referred to as "random propylene copolymer").
The proportion of ethylene in the random propylene copolymer is preferably 2% by mass or more and 70% by mass or less, more preferably 4% by mass or more and 60% by mass or less, from the viewpoint of increasing the liquid barrier properties of the nonwoven fabric. More preferably, it is 6% by mass or more and 50% by mass or less.
Among these polyolefin resins, it is preferable to use polypropylene and polyolefin containing propylene as a copolymer component from the viewpoint of high fiber-forming ability and high liquid barrier property of the resulting nonwoven fabric.
The polyolefin resin is also preferably a blend of homopolypropylene and random propylene copolymer or low stereoregularity homopolypropylene (hereinafter, unless otherwise specified, homopolypropylene other than low stereoregularity homopolypropylene simply referred to as "homopolypropylene"). In particular, the polyolefin resin is preferably a blend of random propylene copolymer and homopolypropylene from the viewpoint of high liquid barrier properties of the nonwoven fabric.
The proportion of the random propylene copolymer or homopolypropylene with low stereoregularity is 5% by mass or more with respect to the fibers that make up the nonwoven fabric (if the nonwoven fabric has a meltblown nonwoven fabric as described later, the fibers that make up the meltblown nonwoven fabric). It is preferable from the viewpoint of further increasing the liquid barrier property of the nonwoven fabric, and from the viewpoint of further increasing the barrier property, it is preferably 7% by mass or more, still more preferably 9% by mass or more, and even more preferably 15% by mass. That's it.
The ratio is preferably less than 60% by mass from the viewpoint of improving the spinnability of the fiber, more preferably 45% by mass or less, and even more preferably 30% by mass or less from the viewpoint of further increasing the spinnability.

As described above, the non-woven fabric forming part of the leak-proof cuff sheet preferably contains triglyceride in its constituent fibers. By forming a leak-proof cuff using a leak-proof cuff sheet composed of a non-woven fabric containing fibers containing triglycerides, the leak-proof cuff has a high ability to conceal excrement, especially feces, and prevents the excrement from seeping out. sex is also higher.

In this specification, the triglyceride contained in the fiber means both the case where the triglyceride is kneaded into the resin constituting the fiber and the case where the triglyceride is attached to the surface of the fiber.

The triglyceride may be contained in all types of fibers that make up the nonwoven fabric, or may be contained only in specific types of fibers among the fibers that make up the nonwoven fabric. For example, when the nonwoven fabric is composed of two types of fibers, fiber A and fiber B, only fiber A or fiber B may contain triglyceride, or both fiber A and fiber B may contain triglyceride. may

From the viewpoint of enhancing the ability of the leakage-preventing cuff 3 to conceal stool and enhancing the ability of the leakage-preventing cuff 3 to prevent excrement from oozing out, the amount of triglyceride blended in the nonwoven fabric is preferably 1% by mass or more in the nonwoven fabric. Preferably, it is 3% by mass or more, and even more preferably 5% by mass or more.
In addition, from the viewpoint of ensuring the strength of the nonwoven fabric, the triglyceride content in the nonwoven fabric is preferably 30% by mass or less, more preferably 25% by mass or less, and even more preferably 20% by mass or less. .
Summarizing the above, the triglyceride content in the nonwoven fabric is preferably 1% by mass or more and 30% by mass or less, more preferably 3% by mass or more and 25% by mass or less, and 5% by mass or more and 20% by mass. The following are more preferable.

The content of triglyceride in the nonwoven fabric referred to in this specification refers to the single layer nonwoven fabric when the nonwoven fabric is composed of a single layer nonwoven fabric.
When the nonwoven fabric has a laminated structure of two or more layers of nonwoven fabrics, and one of the layers is a nonwoven fabric composed of fibers containing triglycerides, the entire nonwoven fabric having a laminated structure can be targeted, but preferably. Only layers containing triglycerides are covered. For example, when the nonwoven fabric is composed of spunbond-meltblown-spunbond nonwoven fabric, and triglyceride is contained only in the fibers constituting the meltblown layer, the SMS nonwoven fabric is separated into layers by means such as peeling, The triglyceride content is calculated based on the weight of the meltblown layer.

The triglyceride used in the present invention is preferably represented by the following formula (1).

In the formula, R ¹ to R ³ represent the same or different hydrocarbon groups. At least one of R ¹ to R ³ is a fatty acid-derived group having 16 or more and 22 or less carbon atoms, and the group is a hydrocarbon group having no unsaturated bond and no substituent. The alkyl group of palmitic acid, which is a fatty acid having 16 carbon atoms, has 15 carbon atoms.
A "hydrocarbon group having no unsaturated bonds" is a hydrocarbon group having neither carbon-carbon double bonds nor triple bonds. In other words, it means an alkyl group. The term "hydrocarbon group having no substituent" means that the hydrogen atoms contained in the hydrocarbon group are not substituted by other atoms or atomic groups (eg, hydroxyl group). Therefore, the term "hydrocarbon group having no unsaturated bonds and substituents" is synonymous with an unsubstituted alkyl group.
In the following description, the triglyceride used in the present invention is also referred to as "the triglyceride of the present invention" for convenience.

In the triglyceride represented by the formula (1), from the viewpoint of increasing the concealability of the leak-proof cuff against excrement and from the viewpoint of increasing the preventive property of the leak-proof cuff against excrement from seeping out, R ¹ to R ³ At least one of them is a fatty acid-derived group having 16 or more and 22 or less carbon atoms, and the group is preferably a hydrocarbon group having no unsaturated bond or substituent, and has 16 carbon atoms. More preferably, it is a group derived from a fatty acid that is 18 or less, and the group is a hydrocarbon group having no unsaturated bond or substituent.
In the triglyceride represented by the formula (1), any one or two of R ¹ to R ³ are a group derived from a fatty acid having 16 or more and 22 or less carbon atoms (the group is an unsaturated bond and a hydrocarbon group having no substituents.), the type of the group is not particularly limited as long as it is a group derived from a fatty acid, but the leakage prevention cuff conceals excrement. and from the viewpoint of enhancing the ability of the leak-proof cuff to prevent excrement from seeping out, the group preferably does not have an unsaturated bond or a substituent.

The triglyceride of the present invention preferably has an adjusted number of carbon atoms in the fatty acid residue. By adjusting the number of carbon atoms in the fatty acid residue, the triglyceride crystals become finer and the anti-bleeding property of the leak-proof cuff is improved. Specifically, the following triglycerides (a) or (b) are preferred.
(a) a triglyceride containing at least a group derived from a fatty acid having 16 carbon atoms (that is, palmitic acid) (the group is a hydrocarbon group having no unsaturated bond or substituent) in one molecule, and carbon A triglyceride containing a mixture with a triglyceride containing at least a group (the group is a hydrocarbon group having no unsaturated bond and no substituent) derived from a fatty acid having 18 atoms (that is, stearic acid) in one molecule.
(b) Triglycerides including triglycerides containing at least a group derived from a fatty acid having 16 carbon atoms and a group derived from a fatty acid having 18 carbon atoms in one molecule.

When the triglyceride of the present invention contains multiple kinds of triglycerides as in the case of (a), at least one kind of triglyceride contains at least one group derived from a saturated fatty acid having 16 carbon atoms in one molecule. (This triglyceride is also referred to as “triglyceride 16”.). Triglyceride 16 may contain one group derived from a saturated fatty acid having 16 carbon atoms in one molecule (this triglyceride is also referred to as "triglyceride P"), or may contain two groups ( This triglyceride is also referred to as "triglyceride PP"), or may contain three (this triglyceride is also referred to as "triglyceride PPP").
There is no particular limitation on the type of the remaining fatty acid residue in triglyceride P and triglyceride PP, and it may be, for example, a saturated fatty acid residue having 12 or more and 24 or less carbon atoms.

The triglyceride 16 may be composed of only triglyceride P, may be composed only of triglyceride PP, or may be composed only of triglyceride PPP.
Triglyceride 16 may be a combination of two or more selected from triglyceride P, triglyceride PP and triglyceride PPP. For example, triglyceride 16 can be a combination of triglyceride P and triglyceride PP, triglyceride P and triglyceride PPP, triglyceride PP and triglyceride PPP, or triglyceride P, triglyceride PP and triglyceride PPP.

When the triglyceride of the present invention contains multiple kinds of triglycerides as in the case of (a), at least one kind of triglyceride contains at least one group derived from a saturated fatty acid having 18 carbon atoms in one molecule. (This triglyceride is also referred to as “triglyceride 18”). Triglyceride 18 may contain one group derived from a fatty acid having 18 carbon atoms in one molecule (this triglyceride is also referred to as "triglyceride S"), or may contain two groups (this The triglyceride is also called "triglyceride SS".), or may contain three (this triglyceride is also called "triglyceride SSS").
The remaining fatty acid residues in triglyceride S and triglyceride SS are not particularly limited, and may be, for example, saturated fatty acid residues having 12 or more and 24 or less carbon atoms.

The triglyceride 18 may consist of triglyceride S only, triglyceride SS only, or triglyceride SSS only.
The triglyceride 18 may be a combination of two or more selected from triglyceride S, triglyceride SS and triglyceride SSS. For example, triglyceride 18 can be a combination of triglyceride S and triglyceride SS, a combination of triglyceride S and triglyceride SSS, a combination of triglyceride SS and triglyceride SSS, or a combination of triglyceride S, triglyceride SS and triglyceride SSS.

In the case of (a), the triglyceride of the present invention may be composed only of triglyceride 16 and triglyceride 18, or may be composed of other triglycerides in addition to triglyceride 16 and triglyceride 18. Other triglycerides include triglycerides having no fatty acid-derived groups having 12 to 24 carbon atoms and triglycerides containing fatty acid-derived groups having 12 to 24 carbon atoms (provided that triglyceride 16 and triglyceride 18).

A group derived from a saturated fatty acid having 16 carbon atoms is designated as "P", a group derived from a saturated fatty acid having 18 carbon atoms is designated as "S", and a saturated fatty acid having 16 carbon atoms and other than a saturated fatty acid having 18 carbon atoms. When the fatty acid-derived groups are "X" and "Y", combinations of aliphatic groups constituting the triglyceride of the present invention include, for example, PPP, SSS, PPX, SSX, PXY, SXY, PPS, PSS and PSX is mentioned. The structures of triglycerides represented by PPX, SSX, PXY, SXY and PSX are (A) to (M) below. Although the structures of PPS and PSS are not shown, the structure of PPS conforms to the structure of PPX, and the structure of PSS conforms to the structure of SSX.

For the triglyceride of the present invention, the various triglycerides described above can be used alone. For example, in the case of (b), the triglycerides of the present invention can be the various triglycerides described above alone. For example, the triglyceride of the present invention contains, in one molecule, at least one group derived from a saturated fatty acid having 16 carbon atoms, at least one group derived from a saturated fatty acid having 18 carbon atoms, and other It may be composed of those containing no group derived from a fatty acid. Alternatively, the triglyceride of the present invention contains one group derived from a saturated fatty acid having 16 carbon atoms, one group derived from a saturated fatty acid having 18 carbon atoms, and one group derived from another fatty acid. triglycerides, including

The triglycerides of the present invention may be a combination of two or more of the various triglycerides mentioned above. For example, the triglyceride of the invention may be a combination of (a) and (b) above. Alternatively, a combination of two or more types of (b) may be used.
Furthermore, the triglyceride of the present invention may be a combination of one or more triglycerides described above and other triglycerides. Other triglycerides include, for example, triglycerides containing groups derived from fatty acids having 12 to 24 carbon atoms (excluding triglyceride 16 and triglyceride 18).
In the present invention, the use of the various triglycerides described above alone or the combination of two or more of the various triglycerides described above increases the ability of the leakage-preventing cuff 3 to conceal stool and protects against excrement. This is preferable from the viewpoint of enhancing the anti-bleeding property of the anti-leakage cuff 3 .

The triglyceride contained in the fibers of the non-woven fabric constituting the leak-proof cuff sheet is 5% by mass or more and less than 90% by mass, particularly 5% by mass or more and 75% by mass or less, based on the total amount of groups derived from fatty acids contained in all triglycerides. , especially 35% by mass or more and 70% by mass or less, particularly 50% by mass or more and 70% by mass or less, and further 55% by mass or more and 65% by mass or less is a group derived from a fatty acid having 18 carbon atoms (the group is an unsaturated bond and a hydrocarbon group having no substituent.) from the viewpoint of enhancing the concealability of the leakage-preventing cuff against excrement and enhancing the ability of the leakage-preventing cuff to prevent excrement from seeping out. preferable. From the same viewpoint as above, the triglyceride contained in the fibers of the nonwoven fabric constituting the leak-proof cuff sheet should be 1% by mass or more and less than 55% by mass, particularly 10% by mass or more, based on the total amount of groups derived from fatty acids contained in all triglycerides. % by mass or more and 50% by mass or less, especially 20% by mass or more and 50% by mass or less, particularly 25% by mass or more and 45% by mass or less, is a group derived from a fatty acid having 16 carbon atoms (the group is an unsaturated bond and a substituent ) is preferable from the viewpoint of enhancing the ability of the leak-preventing cuff to conceal excrement and enhancing the ability of the leak-preventing cuff to prevent excrement from seeping out. However, the sum of the ratio of groups derived from fatty acids having 18 carbon atoms and the ratio of groups derived from fatty acids having 16 carbon atoms must not exceed 100% by mass.

The proportions of fatty acid-derived groups having 16 carbon atoms and fatty acid-derived groups having 18 carbon atoms, based on the total amount of fatty acid-derived groups contained in all triglycerides, were measured by the following methods. be.
A good solvent for triglycerides, such as toluene, is used to extract triglycerides contained in the fibers.
The ester bond in the extracted triglyceride is hydrolyzed with alkali, and the methyl-esterified fatty acid is quantitatively analyzed by gas chromatography.

It should be noted that whether or not alkyl chains having different carbon numbers are present in one molecule of triglyceride can be determined by TOF-MS (time-of-flight mass spectrometry). Specifically, the molecular weight distribution of the triglyceride is measured by TOF-MS, and it is determined from the molecular weight of one molecule whether alkyl groups having different numbers of carbon atoms are contained in the molecule. A tandem mass spectrometer (MS/MS) can be used as a mass spectrometer to determine whether or not alkyl chains having different numbers of carbon atoms exist in one molecule of compounds having the same molecular weight. The first mass separator selects specific ions, and the second mass separator separates and detects fragment ions generated by colliding with an inert gas.

The fact that the triglyceride of the present invention does not contain a group derived from an unsaturated fatty acid further enhances the ability of the leakage-preventing cuff to conceal excrement and the ability of the leakage-preventing cuff to prevent excrement from seeping out. preferable from this point of view. The term “free of groups derived from unsaturated fatty acids” includes both cases in which no groups derived from unsaturated fatty acids are included and cases in which a small amount of unsaturated fatty acids is unavoidably included. The case where a small amount of unsaturated fatty acid is unavoidably contained is, for example, based on the total amount of fatty acid-derived groups contained in all triglycerides contained in the fibers constituting the nonwoven fabric. This is the case when the proportion of groups is 2% by mass or less.

As described above, the triglyceride of the present invention does not contain a group derived from a fatty acid having a hydroxyl group, which further enhances the ability of the leak-preventing cuff to conceal excrement and prevents the leak-preventing cuff from exuding excrement. It is preferable from the viewpoint of further increasing the preventive property. A fatty acid having a hydroxyl group is a fatty acid in which at least one hydrogen atom in the hydrocarbon group of the fatty acid is substituted with a hydroxyl group. The phrase "not containing a group derived from a fatty acid having a hydroxyl group" includes both cases in which no group derived from a fatty acid having a hydroxyl group is contained at all, and cases in which a small amount of a group derived from a fatty acid having a hydroxyl group is unavoidably contained. When a group derived from a fatty acid having a hydroxyl group is unavoidably contained in a small amount, for example, the total amount of groups derived from a fatty acid contained in all triglycerides contained in the fibers constituting the nonwoven fabric. This is the case where the proportion of groups derived from fatty acids is 2% by mass or less.

The fibers constituting the nonwoven fabric may contain only triglycerides as glycerides, or may contain monoglycerides and/or diglycerides in addition to triglycerides as long as the desired effects of the present invention are achieved. .

The triglyceride of the present invention is characterized by its fine crystals, and due to this, it has the advantage of not only improving the seepage prevention properties of the leak-proof cuff but also easily causing irregular reflection. As a result, the nonwoven fabric comprising the triglyceride-containing fibers of the present invention has high excrement hiding properties. The hiding property of a nonwoven fabric can be optically evaluated by, for example, color difference ΔE*ab and color difference coefficient.
Regarding the color difference ΔE*ab, it is preferable that this value is 38 or less from the viewpoint of enhancing the concealability of excrement, and from the viewpoint of making this advantage more remarkable, the value of ΔE*ab is 35 or less. is more preferable, and 33 or less is even more preferable. There is no particular lower limit to the color difference ΔE*ab, and the closer it is to zero, the better.
On the other hand, the color difference coefficient is preferably 490 or less, more preferably 450 or less, and even more preferably 400 or less. There is no particular lower limit to the color difference coefficient, and the closer to zero the better.
A method for measuring the color difference ΔE*ab and the color difference coefficient will be described in Examples described later.
As shown in FIG. 3, which will be described later, even when the leak-proof cuff sheet made of non-woven fabric is folded in two and the leak-proof cuff has a two-ply structure, the color difference ΔE*ab and the color difference coefficient are It is measured with the nonwoven fabric in the state before being folded in half.

Fig. 1 shows an example of an absorbent article having leak-proof cuffs provided with leak-proof cuff sheets composed of nonwoven fabric containing fibers containing triglycerides of the present invention. In addition, in the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

The absorbent article 1 shown in FIG. 1 has a vertical direction (a direction orthogonal to the paper surface in FIG. 1) corresponding to the front-back direction of the wearer, that is, the direction extending from the abdomen to the back through the crotch, and and transverse directions Y which are perpendicular to each other. The absorbent article 1 includes a crotch portion arranged in the wearer's crotch portion when worn, an abdominal portion arranged in front of the crotch portion in the longitudinal direction, that is, on the abdomen side of the wearer, and a longitudinal direction from the crotch portion. and a dorsal portion disposed behind the wearer, i.e., on the dorsal side of the wearer. FIG. 1 is a thickness direction cross-sectional view along the lateral direction Y in the crotch portion of the absorbent article 1 .

The absorbent article 1 comprises an absorbent main body 2 comprising an absorbent body 23 . The absorbent article 1 also has a pair of leak-preventing

cuffs

3, 3 arranged in the lateral direction Y at a distance from each other and extending in the longitudinal direction. The anti-leakage cuffs 3, 3 are arranged with a separation portion 39 provided on the skin facing surface of the absorbent main body 2. - 特許庁

The absorbent main body 2 comprises an absorbent body 23, a topsheet 21 disposed on the skin-facing side of the absorbent body 23, and a backsheet 22 disposed on the non-skin-facing side of the absorbent body 23. , and these are integrated by a known joining means such as an adhesive. The absorbent body 23 is interposed between the topsheet 21 and the backsheet 22, and comprises a liquid-retaining absorbent core 24 containing a water-absorbent material and an outer surface (skin-facing surface and non-skin-facing surface) of the absorbent core 24. and a core wrap sheet 25 covering the skin facing surface). The absorbent main body 2 of this embodiment has a rectangular shape in plan view, extends in the longitudinal direction X from the ventral side to the dorsal side, and the longitudinal direction thereof coincides with the longitudinal direction X. As shown in FIG.

The absorbent article 1 includes a pair of

side flap portions

4, 4 including members extending outward in the lateral direction Y from both side edges 23S, 23S along the longitudinal direction of the absorbent body 23. Specifically, the topsheet 21 covers the entire skin-facing surface of the absorbent body 23, the backsheet 22 covers the entire non-skin-facing surface of the absorbent body 23, and both

sheets

21 and 22 further cover the absorbent body 23. , extending outward in the lateral direction Y from both side edges 23S, 23S of the side flap portion 4 together with the leak-proof cuff sheet 30, which will be described later. As described above, the side flap portion 4 is positioned at a portion where the absorber 23 is not arranged, and includes the top sheet 21 , the back sheet 22 and the leakage prevention cuff sheet 30 . The plurality of members forming the side flap portion 4 are joined together by known joining means such as adhesive, heat sealing, ultrasonic sealing, or the like.

A leg cuff 41 is formed at each part of the

side flap parts

4, 4 corresponding to the wearer's leg circumference. The leg cuff 41 is a part of the side flap portion 4 and includes at least a leak-proof cuff sheet 30 and leg cuff-forming elastic members 42 fixed to the sheet 30 in a stretchable state. As shown in FIG. 1, leg cuff 41 also includes backsheet 22 .

As shown in FIG. 1, the leg cuffs 41, 41 have a plurality of thread-like leg cuff forming elastic members 42 extending in the longitudinal direction arranged side by side in the lateral direction. Each leg cuff forming elastic member 42 extends at least over the entire length of the crotch portion in a longitudinally stretchable state. With such a configuration, when the absorbent article 1 is worn, the leg cuffs 41 are contracted by the contractile force of the leg cuff forming elastic members 42 to fit around the wearer's legs.

A leak-proof cuff 3 is provided at a position inward of the leg cuff 41 in the lateral direction Y. The anti-leakage cuff 3 includes a base end portion 31 which includes a cuff sheet 30 and is fixed to another member. In the horizontal direction Y, there is an upright portion 32 that The tip of the standing portion 32 is a free end portion 32a.

A pair of the leak-preventing cuff sheets 30 are arranged on both sides of the skin-facing surface of the absorbent main body 2 along the longitudinal direction, and a separation portion 39 is provided between the pair of the leak-preventing

cuff forming sheets

30, 30. It is The spacing portion 39 is located in the central portion in the lateral direction Y of the absorbent body 2 . Each leakage-preventing cuff-forming sheet 30 is arranged so as to straddle the side edge 23S of the absorbent body 23 in the horizontal direction Y, and has a portion that overlaps with the absorbent body 23 in a plan view and an outer side of the absorbent body 23 in the horizontal direction Y. in the lateral direction Y and a portion located on the left side.

The base end portion 31 is a starting point for the standing portion 32 to stand toward the wearer's skin when the absorbent article 1 is worn. More specifically, the base end portion 31 is a portion adjacent to the upright portion 32 in the lateral direction Y in the fixing portion of the leak-proof cuff sheet 30 to "another member". This is the innermost portion in the horizontal direction Y. The "other member" is a member other than the leak-proof cuff sheet 30 among the constituent members of the absorbent article 1. Typically, the non-skin facing side of the sheet 30 is in contact with the sheet 30. It is a possibly arranged member, for example, a surface sheet 21 as shown in FIG.

As described above, the base end portion 31 is a fixing portion between the leak-proof cuff sheet 30 and other members, and is typically formed by a known joining means such as an adhesive such as hot-melt or heat-sealing. there is The base end portion 31 has a straight shape in a plan view of the absorbent article 1 and extends in the longitudinal direction over substantially the entire longitudinal length of the leak-proof cuff sheet 30 . In addition, the base end portion 31 is located outside the side edge 23S of the absorber 23 in the horizontal direction Y and in the vicinity of the side edge 23S. The shape of the base end portion 31 in plan view of the absorbent article 1 is not particularly limited. It may be a broken line in which fixed portions and non-fixed portions of the cuff-forming sheet 30 and other members are alternately arranged in the vertical direction.

The standing portion 32 is a portion of the leak-proof cuff sheet 30 that is not fixed to other members. The leakage-preventing cuff sheet 30 of the standing portion 32 is folded at a longitudinally extending folding portion 33 as shown in FIG. As a result, the upright portion 32 has a first upright portion 34 extending from the base end portion 31 to the bent portion 33 and a free end portion 32a of the upright portion 32 extending from the bent portion 33 to the wearer's skin more than the first upright portion 34. and a second upright portion 35 located on the near side. That is, in the standing state of the standing portion 32, the first standing portion 34 is located on the base end portion 31 side, and the second standing portion 35 is located on the free end portion 32a side. The second upright portion 35 extends outward in the lateral direction Y so that the surface thereof can come into contact with the wearer's skin when the diaper 1 is worn.

The first upright portion 34 extends inward in the lateral direction Y from the base end portion 31 toward the bent portion 33 , and the second upright portion 35 extends outward in the lateral direction Y from the bent portion 33 . The bent portion 33 is the portion closest to the center of the diaper 1 in the lateral direction Y in the upright portion 32, and forms a straight line extending in the longitudinal direction when the absorbent article 1 is unfolded and stretched. A spaced portion 39 between the pair of leak-preventing

cuffs

3 , 3 is a region sandwiched between the bent portion 33 of one leak-preventing cuff 3 and the bent portion 33 of the other leak-preventing cuff 3 .

In the present specification, the "unfolded and stretched state" of the absorbent article 1 means that the absorbent article 1 is in the unfolded state, and the elastic members of each part of the absorbent article 1 in the unfolded state are stretched to the design dimensions (elastic members It is the same as the dimension when expanded in a plane with the influence of all removed).

As shown in FIG. 1, the second upright portion 35 includes a portion in which one leak-proof cuff sheet 30 is folded in two in the lateral direction Y to form a two-ply stack. In other words, the leak-preventive cuff 3 has a portion where the leak-preventive cuff sheet 30 is double layered, and this portion forms a part of the second upright portion 35 . A free end portion 32 a of the standing portion 32 is positioned at the crease of the leak-proof cuff forming sheet 30 .
On the other hand, the first standing portion 34 is used without bending the single cuff sheet 30 .

At the part where the leak-proof cuff sheet 30 is folded in two in the horizontal direction Y to form a two-ply layer, a plurality of thread-like elastic members 36 are stretchable in the vertical direction between the

sheets

30, 30 and stretched in the horizontal direction. arranged side by side with Y. A second upright portion 35 is thus formed. The second upright portion 35 on which the elastic member 36 is arranged has stretchability in the vertical direction. The elastic member 36 is preferably thread-like, but may alternatively be strip-like.

The standing portion 32 is preferably present at least in the crotch portion of the absorbent article 1 . This is because the part of the absorbent article 1 where excrement concentrates and leakage is particularly problematic is the crotch part. The upright portion 32 preferably extends over the entire longitudinal length of the crotch portion and further extends to both the ventral portion and the dorsal portion.

When the absorbent article 1 is worn, the first upright portion 34 and the second upright portion 35 of the leakage-preventing cuff 3 move toward the proximal end as shown in FIG. Stand up using the portion 31 as the base end for standing up. As a result, a leak-proof wall consisting of the upright portions 32 is formed on both longitudinal side portions of the skin-facing surface of the absorbent body 2 at least in the crotch portion. The pair of leak-proof walls dam excrement such as urine and feces excreted on the skin-facing surface of the diaper 1 to prevent the excrement from leaking outward in the lateral direction Y of the diaper 1 . 1 and 2, the leak-proof cuff sheet 30 is folded so that the free end 32a of the second standing portion 35 is located outside the bent portion 33 in the horizontal direction Y. Therefore, when the absorbent article 1 is worn, the upper surface of the second standing portion 35 is likely to come into contact with the wearer's skin. more effectively prevented. Hereinafter, the folding mode of the leak-proof cuff sheet 30 shown in FIGS. 1 and 2 is also referred to as "outward folding".

In the absorbent article 1 having the second standing portions 35 formed by outward folding, the length 35L along the lateral direction Y of the second standing portions 35 at the crotch portion in the unfolded and stretched state of the absorbent article 1 (see FIG. 1) (i.e., 35L+35L) is preferably 20% or more and 50% or less of the distance 39L (see FIG. 1) between the leak-

proof cuffs

3, 3 along the lateral direction Y (hereinafter referred to as This value is also referred to as "second standing portion ratio"). A distance 39L between the leak-

proof cuffs

3, 3 along the lateral direction Y matches the length of the spacing portion 39 in the lateral direction Y.

By setting the ratio of the second upright portions within the above range, the leak-proof cuff 3 having the second upright portions 35 formed by the outward folding becomes more excellent in leakage prevention performance. Specifically, by setting the ratio of the second standing portion to 20% or more, the leakage prevention function of the second standing portion 35, that is, the function of blocking excrement such as urine and feces, is improved, and the excrement is kept in an upright state. It becomes difficult to get over the leak-proof cuff 3 and leak outward in the lateral direction Y. By setting the ratio of the second standing portions to 50% or less, the second standing portions 35 are less likely to protrude outward from the absorbent article 1 beyond the longitudinal side edges of the side flap portions 4. As a result, it is possible to suppress the deterioration of the leak-proof action of the leak-proof cuff 3 .
From the above point of view, the second upright portion ratio is more preferably 25% or more and 47.5% or less, and even more preferably 30% or more and 45% or less.
As is clear from the above description, in the absorbent article 1, it is preferable that at least the part where the ratio of the second standing portion satisfies the above-described range exists in the crotch portion. This is because the crotch part is the part where leakage is most likely to occur.

From the viewpoint of making the advantage of the ratio of the second standing portion within the above range even more remarkable, it is preferable to set the dimensions of each portion of the absorbent article 1 as follows.
The length 35L in the horizontal direction Y of the second standing portion 35 in the unfolded and stretched state of the absorbent article 1 in plan view is preferably 7.5 mm or more, more preferably 10 mm or more, and preferably 17.5 mm or less. , more preferably 15 mm or less. The length 35L of the second upright portion 35 of one of the pair of leak-

proof cuffs

3, 3 and that of the other are typically the same, but may be different.
The length 39L of the spaced portion 39 in the lateral direction Y in plan view in the unfolded and stretched state of the absorbent article 1 is preferably 60 mm or more, more preferably 70 mm or more, and preferably 90 mm or less, more preferably 80 mm or less. is.
The length 39L of the spacing portion 39 may be constant over the entire longitudinal length of the spacing portion 39, or may be variable in the longitudinal direction. In the latter case, length 39L preferably varies in the longitudinal direction within the preferred range noted above.

In the absorbent article 1, it is preferable that the portion where the ratio of the second standing portion satisfies the above-described range exists at least in the crotch portion. This is because the crotch part is the part where leakage is most likely to occur. The most preferable form is that when an arbitrary imaginary straight line VL is drawn across the pair of leakage-preventing cuffs 3, 3 (the pair of standing portions 32, 32) in the lateral direction Y, the second standing portion/spaced portion It is a mode in which the ratio is in the range of 20% or more and 50% or less. That is, it is most preferable that the entirety of the pair of leakage prevention cuffs 3, 3 (the pair of standing portions 32, 32) and the spaced portion 39 sandwiched between them is the specified portion.

Another embodiment of the anti-leakage cuff 3 is shown in FIG. In the embodiment shown in FIGS. 1 and 2 described above, the leak-preventive cuff 3 has a part where the leak-preventive cuff sheet 30 is layered in two, whereas the leak-proof cuff sheet 30 shown in FIG. The leakage-preventing cuff 3 is formed by folding the leakage-prevention cuff sheet 30 in two and forming the entire leakage-prevention cuff 3 from the two-layered leakage-prevention cuff sheet 30.例文帳に追加By configuring the leak-preventing cuff 3 in this way, the liquid resistance of the leak-preventing cuff 3 can be further enhanced.

As shown in FIG. 3, the leak-proof cuff 3 has a joint portion 37 formed by joining the two-layered leak-proof cuff sheets 30 at a position between the base end portion 31 and the free end portion 32a. there is The joint portion 37 is a portion where the two-ply leak-proof cuff sheets 30 are joined together by various joining means such as heat-sealing or bonding with an adhesive. The joint portion 37 extends along the longitudinal direction of the absorbent article 1 . For example, the joint portion 37 can be formed so as to extend linearly along the longitudinal direction of the absorbent article 1 in parallel with the base end portion 31 . By providing the joint portion 37 to the leak-preventive cuff 3, the erectability of the leak-preventive cuff 3 can be enhanced. From the viewpoint of making this advantage even more remarkable, it is preferable that the joint portion 37 is formed in the first standing portion 34 of the standing portion 32 of the leak-proof cuff 3 , particularly the first standing portion 34 . , is preferably formed at a position closer to the base end portion 31 .

As shown in FIG. 3, in the leak-proof cuff 3 which is entirely formed from the two-layered leak-proof cuff sheet 30, the two-layered leak-proof cuff sheet is provided between the joint portion 37 and the free end portion 32a. It is preferable to have a non-bonded portion 38 where the 30 are in a non-bonded state. Since the leak-preventive cuff 3 has the non-bonded portion 38, the liquid resistance of the leak-preventive cuff 3 is further improved, the concealability of the leak-preventive cuff 3 against excrement is further enhanced, and the leak-preventive cuff against excrement is further enhanced. 3 is preferable because the bleeding prevention property of 3 is further enhanced. From the viewpoint of making this advantage even more remarkable, it is preferable that the non-bonded portion 38 is formed in the first standing portion 34 of the standing portions 32 of the leak-proof cuff 3 . As for the second upright portion 35, the non-bonded portion may or may not be formed. From the viewpoint of securely fixing the elastic member 36 to the leak-proof cuff sheet 30, it is preferable that the second upright portion 35 does not have a non-bonded portion.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above embodiments. For example, in the embodiment shown in FIGS. 1 to 3 , the portion of the leak-proof cuff sheet located outside the base end portion 31 in the lateral direction Y is joined to the back sheet 22 to form the side flap portion 4 . However, instead of this, the portion of the leak-proof cuff sheet located outside the base end portion 31 in the lateral direction Y is folded inward in the lateral direction Y to form the back sheet 22. You may arrange|position between the absorber 23. FIG.

In the embodiment shown in FIG. 3, the leak-proof cuff sheet 30 is folded in two to form the two-layered leak-proof cuff 3. to form a leak-proof cuff.

Furthermore, in the embodiment shown in FIG. 3, the leak-proof cuff sheet 30 is folded in two, and the elastic member 36 is arranged between the two facing leak-proof cuff sheets 30 to form the second standing portion 35. Alternatively, the region near the free end portion 32a of the two-ply leak-proof cuff may be folded back to face each other, and the elastic member 36 may be arranged between the facing sheets to form the second standing portion. . Therefore, in this embodiment, the second standing portion is composed of a total of four anti-leakage cuff sheets.

The present invention further discloses the following absorbent articles regarding the above-described embodiments.
<1>
Equipped with a leak-proof cuff extending along the longitudinal direction in each of the lateral side regions,
The leak-preventing cuff is composed of a sheet for forming a leak-preventing cuff containing at least a non-woven fabric,
The constituent fibers of the nonwoven fabric contain triglycerides,
The triglyceride is
(a) a mixture of a triglyceride containing at least a group derived from a fatty acid having 16 carbon atoms in one molecule and a triglyceride containing at least a group derived from a fatty acid having 18 carbon atoms in one molecule, or (b) carbon An absorbent article which is a triglyceride containing at least a group derived from a fatty acid having 16 atoms and a group derived from a fatty acid having 18 carbon atoms in one molecule.

<2>

The triglyceride is represented by formula (1), and at least one of R ¹ to R ³ in formula (1) is a group derived from a fatty acid having 16 or more and 22 or less carbon atoms, preferably the group The absorbent article according to <1> above, wherein is a hydrocarbon group having no unsaturated bond or substituent.
<3>
The absorbent article according to <2> above, wherein R ¹ to R ³ in formula (1) do not have an unsaturated bond or a substituent.
<4>
The triglyceride is
(a) containing a triglyceride containing a mixture of a triglyceride containing at least a group derived from a fatty acid having 16 carbon atoms in one molecule and a triglyceride containing at least a group derived from a fatty acid having 18 carbon atoms in one molecule , the absorbent article according to any one of <1> to <3>.
<5>
The ratio of groups derived from fatty acids having 16 carbon atoms to the total amount of groups derived from fatty acids contained in all triglycerides is 1% by mass or more and less than 55% by mass,
<1> to <4>, wherein the ratio of groups derived from fatty acids having 18 carbon atoms is 5% by mass or more and less than 75% by mass with respect to the total amount of groups derived from fatty acids contained in all triglycerides. Absorbent article according to any one.
<6>
Based on the total amount of groups derived from fatty acids contained in all triglycerides, the ratio of groups derived from fatty acids having 16 carbon atoms is 20 mass% or more and 50 mass% or less, and derived from fatty acids having 18 carbon atoms The absorbent article according to <5> above, wherein the proportion of the group is 50% by mass or more and 70% by mass or less.
<7>
The content of the triglyceride in the nonwoven fabric is 1% by mass or more and 30% by mass or less, preferably 3% by mass or more and 25% by mass or less, and more preferably 5% by mass or more and 20% by mass or less. The absorbent article according to any one of 1> to <6>.

<8>
The triglyceride contained in the fibers of the nonwoven fabric is 1% by mass or more and less than 55% by mass, preferably 10% by mass or more and 50% by mass or less with respect to the total amount of groups derived from fatty acids contained in all triglycerides. more preferably 20% by mass or more and 50% by mass or less, more preferably 25% by mass or more and 45% by mass or less, is a group derived from a fatty acid having 16 carbon atoms, the above <1> to <7 The absorbent article according to any one of >.
<9>
The triglyceride contained in the fibers of the nonwoven fabric is 5% by mass or more and less than 90% by mass, preferably 5% by mass or more and 75% by mass or less, relative to the total amount of groups derived from fatty acids contained in all triglycerides. It is more preferably 35% by mass or more and 70% by mass or less, still more preferably 50% by mass or more and 70% by mass or less, and even more preferably 55% by mass or more and 65% by mass or less is fatty acid having 18 carbon atoms. The absorbent article according to any one of <1> to <8>, which is a derived group.
<10>
The absorbent article according to <1> to <9>, wherein the triglyceride does not contain a group derived from a fatty acid having a hydroxyl group.
<11>
The absorbent article according to any one of <1> to <10>, wherein the leak-preventive cuff has a portion in which the leak-preventive cuff-forming sheets are stacked in two layers.
<12>
The leak-preventing cuff has a base end and a free end, and the two sheets for forming the leak-preventing cuff are joined at a position between the base end and the free end. The absorbent article according to <11> above, which has a bonded portion.

<13>
The leak-proof cuff according to <12> above, wherein the leak-proof cuff has a portion between the free end portion and the joint portion, in which the two sheets for forming the leak-proof cuff are in a non-bonded state. absorbent article.
<14>
The leakage-preventing cuff has a first standing portion located on the base end portion side and a second standing portion located on the free end portion side and extending outward in the lateral direction. > or the absorbent article according to <13>.
<15>
The absorbent article according to <14>, wherein the joint portion is formed in the first standing portion.
<16>
The absorbent article according to <15> above, wherein the joint portion is formed at a position closer to the base end portion in the first standing portion.
<17>
The leak-proof cuff has a first standing portion located on the base end side and a second standing portion located on the free end side and extending outward in the lateral direction,
The absorbent article according to <13>, wherein the non-bonded portion is formed in the first standing portion.

<18>
The absorption according to any one of <12> to <17> above, wherein the second upright portion does not have a portion where the two sheets for forming the leak-proof cuff are not joined to each other. sexual goods.
<19>
In the unfolded and stretched state of the absorbent article, the sum of the lengths of the second standing portions along the lateral direction in the crotch portion is 20% of the distance between the leak-proof cuffs along the lateral direction. The absorbent article according to any one of the above <11> to <18>, which is 50% or less.
<20>
In the unfolded and stretched state of the absorbent article, the sum of the lengths of the second upright portions along the lateral direction in the crotch portion is 25% of the distance between the leak-proof cuffs along the lateral direction. The absorbent article according to <19> above, which is 47.5% or more, preferably 30% or more and 45% or less.
<21>
The absorbent article according to any one of <1> to <20>, wherein the leak-proof cuff forming sheet has a color difference ΔE*ab of 38 or less and a color difference coefficient of 490 or less.
<22>
The absorbent article according to any one of <1> to <21>, wherein the color difference ΔE*ab is 38 or less, preferably 35 or less, and more preferably 33 or less.

<23>
The absorbent article according to any one of <1> to <22>, wherein the color difference coefficient is 490 or less, preferably 450 or less, and more preferably 400 or less.
<24>
The absorbent article according to any one of <1> to <23>, wherein the nonwoven fabric comprises a meltblown nonwoven fabric.
<25>
The absorbent article according to <24> above, wherein the basis weight of the meltblown nonwoven fabric is 1 g/m ² or more.
<26>
The basis weight of the meltblown nonwoven fabric is 1 g/m ² or more and 10 g/m ² or less, preferably 1.5 g/m ² or more and 7 g/m ² or less, and more preferably 2 g/m 2 or ^more and 5 g/m ^{2 or} more. The absorbent article according to <25> above, which is the following.
<27>
The fiber diameter of the constituent fibers of the meltblown nonwoven fabric is 0.1 μm or more and 10 μm or less, preferably 0.3 μm or more and 7 μm or less, more preferably 0.5 μm or more and 5 μm or less, above <24> to <26 The absorbent article according to any one of >.
<28>
The absorbent article according to any one of <24> to <27>, wherein a mass ratio of the meltblown nonwoven fabric to the total mass of the nonwoven fabric is 5% by mass or more and 50% by mass or less.
<29>
The meltblown nonwoven fabric comprises polyolefin fibers,
The absorbent article according to any one of <24> to <28> above, wherein the polyolefin fibers comprise a random propylene copolymer or low stereoregular homopolypropylene and homopolypropylene.
<30>
The absorbent article according to <29> above, wherein the polyolefin fibers include a random propylene copolymer and homopolypropylene.

The present invention will be described in more detail below with reference to examples. However, the scope of the invention is not limited to such examples. "%" means "% by mass" unless otherwise specified.

[Example 1]
A spreadable disposable diaper having the same basic configuration as the absorbent article 1 shown in FIGS. 1 and 2 was produced. Specifically, as an expandable disposable diaper, a Merries tape type S size (registered trademark, manufactured in 2019) manufactured by Kao Corporation is prepared, and the dimensions of each part of the leak-proof cuff of the diaper are adjusted as appropriate. An unfolded disposable diaper of this example was produced. The leak-proof cuff of the diaper had a second standing portion 35 formed by outward folding.

As the leak-proof cuff sheet 30, an SMS nonwoven fabric composed of a polypropylene meltblown nonwoven fabric having the fiber diameter and basis weight shown in Table 1 below and a spunbond nonwoven fabric having the basis weight shown in the same table was used.

A meltblown nonwoven fabric was produced by the following method.
(1) Production of Masterbatch Propylene homopolymer (HP461Y manufactured by Lyondelbasel, hereinafter referred to as “homo PP”), random propylene copolymer (Vistamaxx8880 manufactured by Exxonmobil, hereinafter referred to as “random PP”), and triglyceride These were weighed so that the ratio would be 63/27/10, put into a twin-screw extruder (manufactured by Toyo Seiki) and kneaded to prepare a masterbatch. The proportion of ethylene in random PP was 8%.
Extremely hardened palm oil (manufactured by Ueda Oil Mills Co., Ltd.) was used as the triglyceride. In this triglyceride, the proportion of groups derived from C14 fatty acids is 1%, the proportion of groups derived from C16 fatty acids is 42%, and the proportion of groups derived from C18 fatty acids is 1%, relative to the total amount of groups derived from fatty acids contained in the triglyceride. was 57%. Also, the groups derived from fatty acids did not have unsaturated bonds and substituents.
(2) Production of Meltblown Nonwoven Fabric A meltblown nonwoven fabric was produced using the obtained masterbatch as a raw material.
Table 1 shows the basis weight and the fiber diameter of the constituent fibers of the obtained meltblown nonwoven fabric.
A spunbonded nonwoven fabric shown in Table 1 was overlaid on each surface of the obtained meltblown nonwoven fabric to obtain an SM nonwoven fabric or an SMS nonwoven fabric.
(3) Production of leak-proof cuff Using the obtained SM non-woven fabric or SMS non-woven fabric, a leak-proof cuff having a basis weight shown in Table 1 was produced.
The length 35L of the second upright portion 35, the distance 39L of the spaced portion 39, and the ratio of the second upright portion [(35L+35L)/39L×100] in the leak-proof cuff 3 were as shown in Table 1.

[Examples 2 and 3]
In Example 1, the basis weight of the meltblown nonwoven fabric in the SMS nonwoven fabric of the leakproof cuff sheet constituting the leakproof cuff 3 was changed to the value shown in Table 1. A spreadable disposable diaper was produced in the same manner as in Example 1 except for the above.

[Example 4]
In Example 1, the embodiment shown in FIG. 3 was used as the anti-leakage cuff 3 . The leak-proof cuff 3 has a joint portion 37 formed at a position near the base end portion 31 of the first standing portion 34, and the SMS nonwoven fabric is bonded between the joint portion 37 and the second standing portion 35. It was in a bonded state due to the agent. Further, the basis weights of the spunbond nonwoven fabric and the meltblown nonwoven fabric in the SMS nonwoven fabric were set as shown in Table 1. A spreadable disposable diaper was produced in the same manner as in Example 1 except for these.

[Example 5]
In Example 1, the embodiment shown in FIG. 3 was used as the anti-leakage cuff. The leakage-preventing cuff has a joint formed at a position closer to the proximal end of the first upright, and the SMS nonwoven fabric is in a non-bonded state between the joint and the second upright. . Further, the basis weights of the spunbond nonwoven fabric and the meltblown nonwoven fabric in the SMS nonwoven fabric were set as shown in Table 1. A spreadable disposable diaper was produced in the same manner as in Example 1 except for these.

[Example 6]
In Example 1, the kind of triglyceride used in the SMS nonwoven fabric of the leak-proof cuff sheet constituting the leak-proof cuff 3 was changed to extremely hydrogenated soybean oil. The fiber diameter of this SMS nonwoven fabric was as shown in Table 1.
In this triglyceride, the proportion of groups derived from C16 fatty acids is 11%, the proportion of groups derived from C18 fatty acids is 88%, and the proportion of groups derived from C20 fatty acids is 11%, relative to the total amount of groups derived from fatty acids contained in the triglyceride. was 1%. Also, the groups derived from fatty acids did not have unsaturated bonds and substituents.
A spreadable disposable diaper was produced in the same manner as in Example 1 except for the above points.

[Comparative Example 1]
In Example 5, no triglyceride was added to the meltblown nonwoven in the SMS nonwoven. The basis weight and fiber diameter of this SMS nonwoven fabric were as shown in Table 1. A spreadable disposable diaper was produced in the same manner as in Example 5 except for these.

[Comparative Example 2]
In this comparative example, in the diaper of Comparative Example 1, the leak-proof cuff was folded inward to form the second standing portion. The leak-proof cuff having a second standing portion formed by folding inward means that the leak-proof cuff sheet 30 is not formed with the bent portion 33, and the leak-proof cuff sheet 30 is folded inward in the lateral direction of the diaper with the base end portion 31 as the starting point. It is a leak-proof cuff formed by laying the cuff sheet 30 downward and joining the longitudinal front and rear end regions of the leak-proof cuff sheet 30 to the surface sheet.
A spreadable disposable diaper was produced in the same manner as in Comparative Example 1 except for the above points.

[Comparative Example 3]
In this comparative example, in the diaper of Comparative Example 1, the SMS nonwoven fabric between the joint portion 37 and the second standing portion 35 was joined with an adhesive. A spreadable disposable diaper was produced in the same manner as in Comparative Example 1 except for the above.

〔evaluation〕
With regard to the diapers obtained in Examples and Comparative Examples, the seepage time of simulated loose stool from the leak-proof cuff was measured by the following method. In addition, the degree of prevention of simulated soft stool from climbing over the leakage-preventing cuff was evaluated by the following method. The results are shown in Table 1 below.

[Exudation time of pseudo loose stool from leak-proof cuff]
The diaper was unfolded and placed on a flat surface with the top sheet facing upward. Next, the diaper was tilted so that the angle between the lateral direction and the horizontal direction of the diaper was 40°. In this state, 10 g of simulated loose stool was injected into the leak-proof cuff. After the injection, the time until the pseudo-loose stool seeped outside the leak-proof cuff was measured. The measurement time was up to 300 seconds.
Simulated loose stool was prepared by the following method.
Bile salt (manufactured by Oxoid) was dissolved in ion-exchanged water to obtain a bile acid solution adjusted to a concentration of 1 g of bile salt/100 mL of ion-exchanged water. This bile acid solution was used to prepare simulated loose stools. The composition of the simulated loose stool was as follows.
[Composition of pseudo-soft stool]
・Bentonite deer grade 1 (manufactured by Kanto Kagaku Co., Ltd.) 22.5%
・ Surfactant (Poise 530, solid content 40%, manufactured by Kao Corporation) 0.5%
・ Emulgen 130K (0.03% aqueous solution, manufactured by Kao Corporation) 1.5%
・75.5% bile acid solution

[Degree of prevention of pseudo loose stools from leak-proof cuff]
A diaper was attached to a doll with an excretion point. The doll was placed horizontally on its back, and then tilted 90° so that it was turned sideways. In this sideways position, 10 g of simulated loose stool was injected into the excretion point. Immediately after injection, a pressure of 3 kPa was applied to the leak-proof cuff for 5 seconds. It was visually observed whether or not the simulated soft stools climbed over the leakage-preventing cuff and leaked out laterally due to this pressurization. Two sets of the above evaluation were performed for each level, and the degree of prevention of climbing over was evaluated according to the following criteria.
A: I haven't gotten over 2 sets.
B: Climbing is observed only for one set.
C: Climbing is observed in both sets.

As is clear from the results shown in Table 1, in the diapers of each example, it is found that pseudo-loose stool is less likely to seep out from the leak-proof cuff. On the other hand, in the diapers of Comparative Examples 1 to 3, in which the leakage-preventing cuffs did not contain triglyceride, the fiber diameter was smaller and the basis weight was higher than those of the Examples, but pseudo loose stools from the leakage-preventing cuffs occurred. It can be seen that the exudation of is likely to occur.
In particular, as is clear from the comparison between Examples 4 and 5, when the nonwoven fabric to which triglyceride was added was folded in two and the opposite surfaces were unbonded, the opposite surfaces were bonded. It can be seen that the exudation of pseudo-soft stool is further suppressed compared to the time. On the other hand, from the results of Comparative Examples 1 and 3, when the triglyceride was not added, even when the nonwoven fabric was folded in two and the opposing surfaces were in a non-bonded state, there was only a slight change in the suppression of seepage of pseudo-loose stools. It turns out that The reason for this is that when no triglyceride is added, pseudo loose stool easily seeps into the leak-proof cuff, and the advantage of the non-bonded state is not fully exhibited.

[Reference Example 1]
In this reference example, a polypropylene spunbond-meltblown nonwoven fabric having a fiber diameter and basis weight shown in Table 2 below was used as the leak-proof cuff sheet.

Triglyceride was attached to the surface of the constituent fibers of the nonwoven fabric. The adhesion of the triglyceride was carried out by immersing the nonwoven fabric in a 1.25% triglyceride solution for 5 seconds, pulling the nonwoven fabric out of the solution, and then drying it naturally. The amount of triglyceride attached to the nonwoven fabric to which triglyceride was attached was 5.3%. The adhesion amount (%) of triglyceride was calculated from the formula: (mass of nonwoven fabric after adhesion of triglyceride−mass of nonwoven fabric before adhesion of triglyceride)/mass of nonwoven fabric after adhesion of triglyceride×100.
The nonwoven fabric thus obtained was measured for color difference ΔE*ab and color difference coefficient by the following methods. Those results are shown in Table 2.
A simplified spectral color difference meter NF333 manufactured by Nippon Denshoku Industries Co., Ltd. was used. The measurement sensor was brought into contact with the sample, and the measurement was performed without being affected by external light.
First, the L* value, a* value and b* value were measured with respect to a white standard plate attached to the color difference meter. Next, the nonwoven fabric was placed on a black mount, and the L* value, a* value and b* value were measured in the same manner as described above.
The color difference ΔE*ab between the white standard plate and the nonwoven fabric was calculated based on the following formula.
ΔE*ab=[(ΔL*) ² +(Δa*) ² +(Δb*) ² ] ^1/2
(In the formula, L* indicates lightness, and a* and b* indicate chromaticity.)
The smaller the value of the color difference ΔE*ab, the closer to white the object to be measured and the higher the hiding power.
Measurements were made five times in total for each sample at different sites, and the average value was taken as the color difference ΔE*ab for each nonwoven fabric.
Since the color difference ΔE*ab varies depending on the basis weight of the nonwoven fabric, a color difference coefficient calculated by the following formula was introduced as an index that takes into account the influence of the basis weight of the nonwoven fabric.
Color difference coefficient = ΔE * ab × basis weight (g/m ² )
The smaller the value of the color difference coefficient, the higher the hiding power.

[Reference example 2]
In Reference Example 1, a 1.0% solution of triglyceride was used. The nonwoven fabric used was a spunbond-meltblown-spunbond nonwoven fabric. A nonwoven fabric was obtained in the same manner as in Reference Example 1 except for the above.

[Comparative Reference Examples 1 and 2]
In this comparative reference example, triglyceride was not adhered to the nonwoven fabric used in reference examples 1 and 2. The color difference ΔE*ab and the color difference coefficient of this nonwoven fabric were measured. Those results are shown in Table 2.

[Comparative Reference Example 3]
In this Comparative Reference Example, instead of the triglyceride used in Reference Example 1, Asahiguard AG-E082 (manufactured by AGC Co., Ltd.), which is a fluorine-based water repellent, was attached to the nonwoven fabric. The adhesion amount is as shown in Table 2. A nonwoven fabric was obtained in the same manner as in Reference Example 1 except for the above. The color difference ΔE*ab and the color difference coefficient of this nonwoven fabric were measured. Those results are shown in Table 2.

[Comparative Reference Example 4]
In this comparative reference example, instead of the triglyceride used in reference example 1, triglyceride palmitate was adhered to the nonwoven fabric. The adhesion amount is as shown in Table 2. A nonwoven fabric was obtained in the same manner as in Reference Example 1 except for the above. The color difference ΔE*ab and the color difference coefficient of this nonwoven fabric were measured. Those results are shown in Table 2.

[Comparative Reference Example 5]
In this Comparative Reference Example, instead of the triglyceride used in Reference Example 1, triglyceride stearate was adhered to the nonwoven fabric. The adhesion amount is as shown in Table 2. A nonwoven fabric was obtained in the same manner as in Reference Example 1 except for the above. The color difference ΔE*ab and the color difference coefficient of this nonwoven fabric were measured. Those results are shown in Table 2.

As is clear from the results shown in Table 2, in Reference Example 1 using extremely hardened palm oil as the triglyceride, the ΔE * ab value is small due to the fact that the crystals of the extremely hardened palm oil are fine and diffusely reflect light, and the nonwoven fabric It can be seen that even with a low basis weight, it has high hiding power. In addition, nonwoven fabrics to which triglycerides are not attached tend to increase the color difference coefficient as the basis weight increases (Comparative Reference Examples 1 and 2), while Reference Examples 1 and 2 to which extremely hardened palm oil is attached have a basis weight of the nonwoven fabric. It can be seen that the color difference coefficient is low (that is, the hiding power per basis weight is high) even when the is high.
In addition, from the results of Comparative Reference Example 3, when a fluorine-based water repellent that does not cause irregular reflection is adhered, the ΔE*ab value is larger than in Reference Example 1 in which triglyceride is added, and the hiding property is inferior. I understand.
In addition, from the results of Reference Example 1 and Comparative Reference Examples 4 and 5, triglycerides in which the number of carbon atoms in the fatty acid residue is adjusted cause more irregular reflection, so the ΔE*ab value is small, and the nonwoven fabric has high hiding power. .

According to the absorbent article of the present invention, exudation of excrement from the leak-proof cuff can be suppressed.

Claims

Equipped with a leak-proof cuff extending along the longitudinal direction in each of the lateral side regions,
The leak-preventing cuff is composed of a sheet for forming a leak-preventing cuff containing at least a non-woven fabric,
The constituent fibers of the nonwoven fabric contain triglycerides,
The triglyceride is
(a) a mixture of a triglyceride containing at least a group derived from a fatty acid having 16 carbon atoms in one molecule and a triglyceride containing at least a group derived from a fatty acid having 18 carbon atoms in one molecule, or (b) carbon An absorbent article which is a triglyceride containing at least a group derived from a fatty acid having 16 atoms and a group derived from a fatty acid having 18 carbon atoms in one molecule.
2. According to claim 1, wherein the triglyceride is represented by formula ( 1 ), and at least one of R1 to R3 in formula (1) is a group derived from a fatty acid having 16 or more and 22 or less carbon atoms. The absorbent article described.
The absorbent article according to claim 2, wherein R1 to R3 in formula (1) do not have unsaturated bonds and substituents.
The triglyceride is
(a) containing a triglyceride containing a mixture of a triglyceride containing at least a group derived from a fatty acid having 16 carbon atoms in one molecule and a triglyceride containing at least a group derived from a fatty acid having 18 carbon atoms in one molecule 4. The absorbent article according to any one of claims 1 to 3.
The ratio of groups derived from fatty acids having 16 carbon atoms to the total amount of groups derived from fatty acids contained in all triglycerides is 1% by mass or more and less than 55% by mass,
5. Any one of claims 1 to 4, wherein the ratio of groups derived from fatty acids having 18 carbon atoms is 5% by mass or more and less than 75% by mass with respect to the total amount of groups derived from fatty acids contained in all triglycerides. The absorbent article according to claim 1.
Based on the total amount of groups derived from fatty acids contained in all triglycerides, the ratio of groups derived from fatty acids having 16 carbon atoms is 20 mass% or more and 50 mass% or less, and derived from fatty acids having 18 carbon atoms 6. The absorbent article according to claim 5, wherein the proportion of groups is 50% by mass or more and 70% by mass or less.
The absorbent article according to any one of claims 1 to 6, wherein the triglyceride content in the nonwoven fabric is 1% by mass or more and 30% by mass or less.
In the triglyceride contained in the fibers of the nonwoven fabric, 1% by mass or more and less than 55% by mass of the total amount of groups derived from fatty acids contained in all triglycerides is a group derived from a fatty acid having 16 carbon atoms. 8. The absorbent article according to any one of claims 1 to 7, wherein the absorbent article is an absorbent article.
In the triglyceride contained in the fibers of the nonwoven fabric, 5% by mass or more and less than 90% by mass of the total amount of groups derived from fatty acids contained in all triglycerides is a group derived from a fatty acid having 18 carbon atoms. 9. The absorbent article according to any one of claims 1-8.
The absorbent article according to any one of claims 1 to 9, wherein the triglyceride does not contain a group derived from a fatty acid having a hydroxyl group.
The absorbent article according to any one of claims 1 to 10, wherein the leak-preventive cuff has a part where the leak-preventive cuff-forming sheet is doubled.
The leak-preventing cuff has a base end and a free end, and the two sheets for forming the leak-preventing cuff are joined at a position between the base end and the free end. 12. The absorbent article according to claim 11, having joints formed by bonding.
13. The leak-preventing cuff according to claim 12, wherein the leak-preventing cuff has a portion between the free end portion and the joining portion, in which the two-layered sheets for forming the leak-preventing cuff are in a non-bonded state. absorbent article.
13. The leak-proof cuff has a first standing portion located on the base end side and a second standing portion located on the free end side and extending outward in the lateral direction. Or the absorbent article according to claim 13.
The absorbent article according to claim 14, wherein the joint portion is formed in the first standing portion.
The absorbent article according to claim 15, wherein the joint portion is formed at a position closer to the base end portion of the first standing portion.
The leak-proof cuff has a first standing portion located on the base end side and a second standing portion located on the free end side and extending outward in the lateral direction,
14. The absorbent article according to claim 13, wherein the non-bonded portion is formed in the first standing portion.
18. The absorbent according to any one of claims 12 to 17, wherein the second standing portion does not have a portion where the two sheets for forming the leak-proof cuff are not joined together. sexual goods.
In the unfolded and stretched state of the absorbent article, the sum of the lengths of the second standing portions along the lateral direction in the crotch portion is 20% of the distance between the leak-proof cuffs along the lateral direction. 19. The absorbent article according to any one of claims 11 to 18, wherein the ratio is 50% or more.
In the unfolded and stretched state of the absorbent article, the sum of the lengths of the second upright portions along the lateral direction in the crotch portion is 25% of the distance between the leak-proof cuffs along the lateral direction. 20. The absorbent article according to claim 19, which is not less than 47.5% and not more than 47.5%.
The absorbent article according to any one of claims 1 to 20, wherein the leak-proof cuff forming sheet has a color difference ΔE*ab of 38 or less and a color difference coefficient of 490 or less.
The absorbent article according to any one of claims 1 to 21, wherein the color difference ΔE*ab is 38 or less.
The absorbent article according to any one of claims 1 to 22, wherein the color difference coefficient is 490 or less.
The absorbent article according to any one of claims 1 to 23, wherein said nonwoven fabric comprises a meltblown nonwoven fabric.
25. The absorbent article of Claim 24, wherein the meltblown nonwoven fabric has a basis weight of 1 g/m <2> or greater.
26. The absorbent article according to claim 25, wherein the meltblown nonwoven fabric has a basis weight of 1 g/m <2> to 10 g/m <2> .
The absorbent article according to any one of claims 24 to 26, wherein the fiber diameter of the constituent fibers of the meltblown nonwoven fabric is 0.1 µm or more and 10 µm or less.
The absorbent article according to any one of claims 24 to 27, wherein the mass ratio of said meltblown nonwoven fabric to the total mass of said nonwoven fabric is 5% by mass or more and 50% by mass or less.
The meltblown nonwoven fabric comprises polyolefin fibers,
29. The absorbent article of any one of claims 24-28, wherein the polyolefin fibers comprise random propylene copolymers or low stereoregular homopolypropylene and homopolypropylene.
30. The absorbent article of claim 29, wherein said polyolefin fibers comprise random propylene copolymers and homopolypropylene.