KR102112385B1 - Absorbent article - Google Patents

Abstract

As an absorbent article (1) comprising a liquid-permeable layer (2), a liquid-impermeable layer, an absorbent layer (3), and a gel lotion (6), the gel lotion (6) is a styrene-based elastomer as a gelling agent and lotion In the at least a portion of the two gel regions 8 adjacent to each other among the plurality of gel regions 8 containing hydrocarbons as, and the two proximity points 13 of the two gel regions 8 adjacent to each other , Midpoint 14 in the middle, two proximity points 15, and midpoint points 16 are i) to iii), i) two proximity points 13 The water contact angles of both are 85° or more, ii) the water contact angle at the midpoint 14 is greater than the water contact angle at the two proximity points 15, and iii) the midpoint There is provided an absorbent article characterized in that the difference between the water contact angle of (14) and the water contact angle at the midpoint equivalent point 16 is greater than -3 (°).

Description

Absorbent article{ABSORBENT ARTICLE}

The present disclosure relates to absorbent articles.

In absorbent articles, for example, sanitary napkins, panty liners, etc., the basic performance is improved by the development of technology that has been repeated for a long time, and leakage is less likely to occur after absorbing feces such as acupuncture points as compared to the previous one. It has been lost, and now it is desired to have better high functionalization, for example, to have a close fit to underwear.

In addition, for example, Patent Document 1 discloses an absorbent article containing an effective amount of a lotion coating that is semi-solid or solid at 20° C. at least partially on the outer surface of the top sheet and is partially transferable to the skin of the wearer. In addition, the lotion coating, (i) 10 to 95%, has a plasticity or fluid consistency at 20 °C, selected from petroleum-based emollients, fatty acid ester emollients, alkyl ethoxylate emollients, and mixtures thereof An immobilizing agent containing one, substantially free of moisture, and (ii) an immobilizing material that allows 5 to 90% of the emollient to be immobilized on the outer surface of the top sheet, wherein the immobilizing material comprises: It has a melting point of at least 35°C, preferably at least 40°C, and is used for polyhydroxy fatty acid esters, polyhydroxy fatty acid amides, C ₁₄ -C ₂₂ fatty alcohols, C ₁₂ -C ₂₂ fatty acids, and C ₁₂ -C ₂₂ fatty alcohols. Toxylates, and mixtures thereof.

Patent Document 1: Japanese Patent Publication No. Hei 10-509896

In Patent Document 1, the immobilized material having a melting point of 35°C or higher is crystallized at room temperature (25°C) in the lotion coating, and has a function of immobilizing the lotion coating by increasing the viscosity of the lotion coating.

However, when the lotion coating is immobilized (highly viscous) using an immobilization material, there is a problem in that it is difficult to initially release the "active agent" as an active ingredient from the lotion coating. In addition, even if the lotion coating is immobilized (high viscosity), under high pressure such as body pressure, the lotion coating moves to the inside of the absorbent article (such as voids in the fibers of the top sheet), and the ``emollient agent'' continues to the wearer's skin. There is a problem that it is difficult to work.

Accordingly, the present disclosure aims to provide an absorbent article that continuously releases a lotion that protects the wearer's skin and also has excellent rewetability.

The present disclosure is an absorbent article having a liquid-permeable layer having a skin-contacting region and a skin-non-contacting region, a liquid-impermeable layer, an absorbent layer between the liquid-permeable layer and the liquid-impermeable layer, and a gel lotion, and having a thickness direction. , The gel lotion contains a styrene-based elastomer as a gelling agent, a hydrocarbon as a lotion, and the liquid-permeable layer has a plurality of gel regions having the gel lotion and a gel lotion in the skin contacting region. A non-gel region, and a plurality of gel region overlap regions and a non-gel region overlap region, which overlap each of the plurality of gel regions and the non-gel region and the thickness direction in the skin non-contact region, among the plurality of gel regions , In at least a portion of the two gel regions adjacent to each other, two proximity points of the two gel regions adjacent to each other, two proximity points which are closest to each other, and intermediate between the two proximity points and also present in the non-gel region. A point and two proximity points of the two proximity points overlapping in the thickness direction and also present in the gel region overlapping region, and the intermediate point overlapping in the thickness direction and overlapping the non-gel region The midpoint equivalent points present in the region, i) to iii) below, i) the water contact angles of the two proximity points are both 85° or more, and ii) the water contact angles at the midpoints are the two It is characterized by having a relationship greater than the water contact angle at the proximity point, and iii) the difference between the water contact angle at the midpoint and the water contact angle at the midpoint equivalent point is greater than -3 (°). Absorbent article to be found.

The absorbent article of the present disclosure continuously releases a lotion that protects the wearer's skin and is excellent in rewetability.

1 is a plan view showing an absorbent article 1 according to an embodiment of the present disclosure.
FIG. 2 is a cross-sectional view taken along the section II-II of region A in FIG. 1.
3 is a schematic view for explaining the effects of the present disclosure.
4 is a plan view showing the absorbent article 1 according to another embodiment of the present disclosure.
FIG. 5 is an enlarged view of area A in FIG. 4.
6 is a partial plan view for explaining the absorbent article 1 according to another embodiment of the present disclosure.

The absorbent article of the present disclosure will be described in detail below.

The absorbent article of the present disclosure includes a liquid-permeable layer having a skin-contacting region and a skin-non-contacting region, a liquid-impermeable layer, an absorbent layer between the liquid-permeable layer and the liquid-impermeable layer, and a gel lotion, and has a thickness direction.

[Gel lotion]

The gel lotion contains a styrene-based elastomer as a gelling agent and a hydrocarbon as a lotion.

The gelling agent contains styrene-based elastomer as a component for maintaining the lotion.

It is preferable to have a hard segment and a soft segment as the styrene-based elastomer, and a polystyrene block is preferable as the hard segment, and a polyolefin block is preferable as the soft segment.

The polystyrene block includes not only a block made of a styrene homopolymer (ie, a polystyrene block), but also a block made of a homopolymer of α-methylstyrene (ie, a polyα-methylstyrene block), and styrene and α-methylstyrene. Blocks made of copolymers are included.

The polyolefin block includes, for example, a block made of a homopolymer of polyolefin, such as a polyethylene block, a polypropylene block, a polybutylene block, and a polybutadiene block, and a block made of a copolymer of polyolefin, such as ethylene, propylene, And blocks made of copolymers such as butylene and butadiene.

Moreover, in this specification, butadiene is also handled as an olefin monomer for convenience.

The soft segment also includes hydrogen adducts of polybutadiene blocks and hydrogen adducts of blocks composed of butadiene and copolymers such as ethylene, propylene, butylene, and butadiene.

As the styrenic elastomer, it is preferable to have a hard segment at the sock end, and one or more types of soft segments between them.

As a specific example of the said styrene-type elastomer, the following are mentioned, for example.

(i) Polystyrene-block-poly(ethylene-co-propylene)

(Hereinafter, ``SEP'' may be omitted)

(ii) polystyrene-block-poly(ethylene-co-propylene)-block-polystyrene

(Hereafter, ``SEPS'' may be omitted)

(iii) polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene

(Hereafter, ``SEBS'' may be omitted)

(iv) polystyrene-block-polyethylene-block-poly(ethylene-co-propylene)-block-polystyrene

(Hereafter, ``SEEPS'' may be omitted)

The styrene-based elastomer preferably has a weight average molecular weight of 5,000 to 500,000, more preferably 10,000 to 400,000, and even more preferably 50,000 to 300,000. When the weight average molecular weight is less than 5,000, the styrenic elastomer tends to be difficult to maintain the gel structure, and when the weight average molecular weight exceeds 500,000, the wearing feeling tends to decrease.

In addition, the measuring method of a weight average molecular weight is mentioned later.

The styrene-based elastomer preferably contains 10 to 50 mass% polystyrene blocks and 50 to 90 mass% polyolefin blocks, more preferably 15 to 40 mass% polystyrene blocks, and 60 to 85 mass% It contains the polyolefin block of, and, More preferably, it contains the polystyrene block of 18-35 mass %, and the polyolefin block of 65-82 mass %.

When the amount of the polystyrene block is less than 10% by mass, it tends to be difficult for the polystyrene block to form a micro-layer separation structure described later. When the amount of the polystyrene block exceeds 50% by mass, the amount of the polyolefin block capable of holding the lotion tends to decrease, and furthermore, the amount of the lotion that can be maintained tends to decrease. In addition, the amount of the micro-layer separation structure of the polystyrene block increases, and the gel lotion to be formed becomes hard, and the fit tends to be inferior.

The reason why the styrene-based elastomer produces a gel lotion is as follows. The hard segments of the styrenic elastomers aggregate together to form domains and act as crosslinking points. On the other hand, the soft segment serves as a mesh connecting these bridge points. As a result, the styrenic elastomer functions as an elastic body.

When the styrenic elastomer is mixed with the lotion, especially hydrocarbon, the soft segment of the styrenic elastomer retains the lotion while the hard segment remains domain-formed. As a result, the mixture of styrene-based elastomer and the above lotion (gel lotion) functions as an elastic body having a lower compressive stress than the styrene-based elastomer alone.

In addition, the lotion is only held on the loose mesh of the soft segment of the styrenic elastomer, and can be moved to the surface of the gel lotion.

The lotion contains a hydrocarbon. In this specification, "hydrocarbon" means a compound composed of carbon and hydrogen. Examples of the hydrocarbons include chain hydrocarbons, such as paraffinic hydrocarbons (does not contain double bonds and triple bonds, also referred to as alkanes), olefinic hydrocarbons (including one double bond, also referred to as alkenes), acetylene hydrocarbons (Including a triple bond, also called alkyne), and a hydrocarbon containing two or more bonds selected from the group consisting of double bonds and triple bonds, and cyclic hydrocarbons such as aromatic hydrocarbons and alicyclic hydrocarbons. Can be.

The hydrocarbon is preferably a chain hydrocarbon and an alicyclic hydrocarbon, more preferably a chain hydrocarbon, and a hydrocarbon containing two or more paraffinic hydrocarbons, olefinic hydrocarbons, and double bonds (does not contain triple bonds) Not), and more preferably a paraffinic hydrocarbon.

The chain hydrocarbons include straight chain hydrocarbons and branched hydrocarbons.

The hydrocarbon preferably has a kinematic viscosity of 0.01 to 80 mm ² /s at 40° C., preferably has a catch rate of 0.01 to 4.0 mass%, and a weight average molecular weight of less than 1,000. It is preferred to have. This is because hydrocarbons can act as a humoral activity-imparting agent, which will be described later.

In the gel lotion of the present disclosure, a lot of a lotion (eg, hydrocarbon) is bleeded on the surface of the gel lotion. When the bleeding lotion on the surface moves to the wearer's skin or disappears by absorbing into the absorbent body together with body fluids such as acupuncture points and urine, the lotion is newly bleeded from the gel lotion. Therefore, the gel lotion can continuously release the lotion.

The said lotion contains the said hydrocarbon, Preferably it is 50-100 mass %, More preferably, it is 60-100 mass %, More preferably, it contains 70-100 mass %. It is in terms of gel formation.

The gel lotion, as the lotion, may further include a component known as a lotion in the art, in addition to the aforementioned hydrocarbons.

The gel lotion is, as the lotion, in addition to the above-mentioned hydrocarbon, IOB of more than 0.00 and 0.60 or less, kinematic viscosity of 0.01 to 80 mm ² /s at 40° C., catch rate of 0.01 to 4.0 mass%, and 1,000 It is preferable to further include a bodily fluid activity-imparting agent having a weight average molecular weight of less than.

The body fluid activity-imparting agent is the same component as the "blood modifier" described in the applicant's international publication 2012/133724 brochure, and the "blood activity-imparting agent" described in the international publication 2013/129236 brochure. It is the same ingredient.

When the gel lotion includes the above-described body fluid activity-imparting agent, the body-liquid activity-imparting agent is continuously released from the gel lotion, and over a long period of time, the body fluid or the like that has reached the liquid-permeable layer can be quickly lubricated into the absorber.

IOB (Inorganic Organic Balance) is an index indicating the balance of hydrophilicity and lipophilicity.

IOB = inorganic value/organic value

It means the value calculated by.

The said inorganic value and organic value are based on the organic conceptual diagram described in the area|region Vol.11, No.10(1957) p.719-725 of "A prediction of organic compounds and organic conceptual diagram" by Atsushi Fujita.

The organic and inorganic values of the main groups by Fujita are summarized in Table 1 below.

[Table 1]

The said kinematic viscosity is "5. Kinematic Viscosity Test Method”, it is measured at a test temperature of 40° C. using a Canon Penske countercurrent viscometer.

In the present specification, the "capture rate" means the proportion of water held by the substance, and is measured as follows.

(1) In a constant temperature room at 40°C, a test tube, a rubber stopper, a substance to be measured, and deionized water are left standing for 24 hours.

(2) In the constant temperature room, 5.0 g of a substance to be measured and 5.0 g of deionized water are added to a 20 mL test tube.

(3) In the constant temperature room, the test tube's mouth is covered with a rubber stopper, rotated once, and allowed to stand for 5 minutes.

(4) In the constant temperature room, 3.0 g of a layer (usually, an upper layer) of a material to be measured is collected in a glass chalet having a diameter of 90 mm and a mass: W ₀ (g).

(5) The chalet is heated in an oven at 105°C for 3 hours, water is evaporated, and the mass of the chalet is measured: W ₁ (g).

(6) The catch rate is calculated according to the following equation.

Catching rate (mass%) = 100×[W ₀ (g)-W ₁ (g)]/3.0(g)

The measurement is carried out three times, and the average value is adopted.

In the present specification, the "weight average molecular weight" refers to a polydispersed compound (eg, a compound prepared by sequential polymerization, a plurality of fatty acids, and esters produced from a plurality of aliphatic monohydric alcohols) and a single compound (eg , A concept comprising one fatty acid and an ester produced from one aliphatic monohydric alcohol, consisting of N _i molecular weight M _i molecules (i = 1, or i = 1, 2 ...) In the system, the following equation:

M _w = ΣN _i M _i ² /ΣN _i M _i

It means M _w obtained by.

In this specification, a weight average molecular weight means the value of polystyrene conversion calculated|required by gel permeation chromatography (GPC).

As a measurement condition of GPC, the following are mentioned, for example.

Model: High-speed liquid chromatogram manufactured by Hitachi High-Technologies Co., Ltd. Lachrom Elite

Column: SHODEX KF-801, KF-803 and KF-804 manufactured by Showa Denko Co., Ltd.

Eluent: THF

Flow rate: 1.0 mL/min

Injection volume: 100 μL

Detection: RI (differential refractometer)

The humoral activity-imparting agent, preferably, the following (i) and (ii),

(i) selected from the group consisting of a carbonyl group (-CO-) and an oxy group (-O-), interposed between the (i-1) hydrocarbon moiety and (i-2) the CC single bond of the hydrocarbon moiety, 1 or a plurality of compounds having the same or different groups, and

(ii) selected from the group consisting of a carbonyl group (-CO-) and an oxy group (-O-), inserted between the (ii-1) hydrocarbon moiety and (ii-2) the CC single bond of the hydrocarbon moiety, 1 or a plurality of groups selected from the group consisting of a carboxyl group (-COOH) and a hydroxyl group (-OH), which replaces the hydrogen atom of the hydrocarbon moiety with (ii-3) the same or different groups, Compounds having the same or different groups,

And any combination thereof.

Moreover, the said hydrocarbon part is synonymous with the above-mentioned hydrocarbon.

In the compounds of (i) and (ii), when two or more oxy groups (-O-) are inserted, each oxy group (-O-) is not adjacent. Therefore, the compound of the said (i) and (ii) does not contain the compound (so-called peroxide) in which an oxy group continues.

The body fluid activity-imparting agent, more preferably, the following (i') and (ii'),

(i') (i'-1) a carbonyl bond (-CO-), an ester bond (-COO-), carbonate inserted between the hydrocarbon moiety and the CC single bond of the (i'-2) hydrocarbon moiety A compound having one or more, identical or different bonds, selected from the group consisting of a bond (-OCOO-), and an ether bond (-O-), and

(ii') (ii'-1) a carbonyl bond (-CO-), an ester bond (-COO-), a carbonate inserted between the hydrocarbon moiety and (ii'-2) the CC single bond of the hydrocarbon moiety A carboxyl group, substituted with one or more, identical or different bonds selected from the group consisting of a bond (-OCOO-) and an ether bond (-O-), and (ii'-3) the hydrogen atom of the hydrocarbon moiety A compound having one or more, identical or different groups, selected from the group consisting of (-COOH) and hydroxyl groups (-OH),

And any combination thereof.

Moreover, the said hydrocarbon part is the same as the above-mentioned hydrocarbon.

In the compounds of (i') and (ii'), when two or more identical or different bonds are inserted, that is, carbonyl bond (-CO-), ester bond (-COO-), carbonate bond (- When two or more identical or different bonds selected from OCOO-) and ether bonds (-O-) are inserted, each bond is not contiguous, and at least one carbon atom is interposed between each bond.

Examples of the body fluid activity-imparting agent include (a ₁ ) an ester of a chain hydrocarbon tetraol with at least one fatty acid, (a ₂ ) an ester of a chain hydrocarbon triol with at least one fatty acid, and (a ₃ ) a chain hydrocarbon. An ester of a diol with at least one fatty acid, (b ₁ ) ether of a chain hydrocarbon tetraol with at least one aliphatic monohydric alcohol, (b ₂ ) a chain hydrocarbon triol with at least one aliphatic monohydric alcohol Ether, (b ₃ ) ether of a chain hydrocarbon diol and at least one aliphatic monohydric alcohol, (c ₁ ) chain hydrocarbon tetracarboxylic acid having 4 carboxyl groups, hydroxy acid, alkoxy acid or oxo acid, at least Ester with one aliphatic monohydric alcohol, (c ₂ ) Ester with chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having three carboxyl groups, and at least one aliphatic monohydric alcohol, (c ₃ ) an ester of a chain hydrocarbon dicarboxylic acid having two carboxyl groups, hydroxy acid, alkoxy acid or oxo acid and at least one aliphatic monohydric alcohol, (d ₁ ) aliphatic monohydric alcohol and aliphatic monohydric alcohol Ether of (d ₂ ) dialkyl ketone, (d ₃ ) ester of fatty acid and aliphatic monohydric alcohol, (d ₄ ) dialkyl carbonate, (e ₁ ) polyoxyC _{3 ~} C ₆ alkylene glycol, (e ₂ ) an ester of polyoxyC _{3 to} C ₆ alkylene glycol with at least one fatty acid, and (e ₃ ) an ether of polyoxyC _{3 to} C ₆ alkylene glycol with at least one aliphatic monohydric alcohol, and these And any combination thereof.

Hereinafter, these compounds will be described.

[(a ₁ ) Ester of chain hydrocarbon tetraol and at least one fatty acid]

Chained hydrocarbon tetraol means a compound in which the aforementioned hydrogen atom of the chained hydrocarbon (4 in total) is substituted with a hydroxyl group (-OH) (4 in total), and the chained hydrocarbon tetraol is at least As an ester with a fatty acid, for example, the following formula (1):

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

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

Diester of pentaerythritol and fatty acid, the following formula (4):

And monoesters of pentaerythritol and fatty acids.

(In the formula, each of R ¹ to R ⁴ is a chain hydrocarbon)

The fatty acids (R ¹ COOH, R ² COOH, R ³ COOH, and R ⁴ COOH) constituting the ester of the pentaerythritol and fatty acids include, for example, saturated fatty acids, such as saturated fatty acids of C _{2 to} C ₃₀ , such as , Acetic acid (C ₂ ) (C ₂ represents carbon number, corresponds to the number of carbon atoms of R ¹ C, R ² C, R ³ C or R ⁴ C, hereinafter the same), propanoic acid (C ₃ ), butanoic acid ( C ₄ ) and its isomers such as 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 ) and isomers thereof, such as 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 ), eiconic acid (C ₂₀ ), doco Acid acids (C ₂₂ ), tetracoic acid (C ₂₄ ), hexacoic acid (C ₂₆ ), octacoic acid (C ₂₈ ), triaconic acid (C ₃₀ ), and the like, and isomers thereof not listed. have.

The fatty acid may also be an unsaturated fatty acid. Examples of the unsaturated fatty acids include C _{3 to} C ₂₀ unsaturated fatty acids such as monounsaturated fatty acids such as crotonic acid (C ₄ ), myristoleic acid (C ₁₄ ), palmitoleic acid (C ₁₆ ), and oleic acid ( C _18), L. fluoride acid (C _18), night sensan (C _18), gadol resan (C _20), eicosyl sensan (C ₂₀₎ such as, di-unsaturated fatty acids, e.g., linoleic acid (C _18), eicosyl four diene acid (C ₂₀ ) etc., tri-unsaturated fatty acids, such as linolenic acid, such as α-linolenic acid (C ₁₈ ) and γ-linolenic acid (C ₁₈ ), pinolenic acid (C ₁₈ ), eleostearic acid, such as α-eleoste Tetra unsaturated fatty acids, such as aric acid (C ₁₈ ) and β-eleostearic acid (C ₁₈ ), mid acid (C ₂₀ ), dihomo-γ-linolenic acid (C ₂₀ ), eicosatrienoic acid (C ₂₀ ) Pentaunsaturated fatty acids such as stearidonic acid (C ₂₀ ), arachidonic acid (C ₂₀ ), eicosatetraenoic acid (C ₂₀ ), such as boseopentaenoic acid (C ₁₈ ), eicosapentaenoic acid (C ₂₀ ) and the like, and partial hydrogen adducts thereof.

[(a ₂ ) Ester of chain hydrocarbon triol and at least one fatty acid]

Chained hydrocarbon triol means a compound in which the hydrogen atom (three in series) of the aforementioned chained hydrocarbon is substituted with a hydroxyl group (-OH) (three in series), and at least with the chained hydrocarbon triol. As an ester with a fatty acid, for example, the following formula (5):

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

Diester of glycerin with fatty acids, and the following formula (7):

(In the formula, each of R ⁵ to R ⁷ is a chain hydrocarbon)

And monoesters of glycerin and fatty acids.

The fatty acids are as described above.

[(a ₃ ) Ester of chain hydrocarbon diol and at least one fatty acid]

The chain hydrocarbon diol means a compound in which the hydrogen atom (two systems) of the above-described chain hydrocarbon is substituted with a hydroxyl group (-OH) (two systems), and at least one of the chain hydrocarbon diols As an ester with a 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)

Diesters of C ₂ to C ₆ glycols with fatty acids, and the following formula (9):

R ⁸ COOC _k H _2k OH (9)

(Wherein, k is an integer from 2 to 6, and R ⁸ is a chain hydrocarbon)

And monoesters of C ₂ to C ₆ glycols and fatty acids.

The fatty acids are as described above.

[Ether of (b ₁ ) chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol]

(b ₁ ) As an ether of the chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol, for example, the following formulas (10) to (13):

(In the formula, each of R ¹⁰ to R ¹³ is a chain hydrocarbon)

The tetraether, triether, diether, and monoether of pentaerythritol and aliphatic monohydric alcohol are mentioned.

In addition, the chain hydrocarbon tetraol is as described above.

Examples of the aliphatic monohydric alcohols include saturated aliphatic monohydric alcohols and unsaturated aliphatic monohydric alcohols.

Examples of the saturated aliphatic monohydric alcohol include, for example, C _{1 to} C ₂₀ saturated aliphatic monohydric alcohols, such as methyl alcohol (C ₁ ) (C ₁ represents carbon number, hereinafter the same), ethyl alcohol (C ₂ ). , Propyl alcohol (C ₃ ) and isomers thereof, such as isopropyl alcohol (C ₃ ), butyl alcohol (C ₄ ) and isomers thereof, such as sec-butyl alcohol (C ₄ ) and tert-butyl alcohol (C ₄ ) , Pentyl alcohol (C ₅ ), hexyl alcohol (C ₆ ), heptyl alcohol (C ₇ ), octyl alcohol (C ₈ ) and isomers thereof, such as 2-ethylhexyl alcohol (C ₈ ), nonyl alcohol (C ₉ ) , Decyl alcohol (C ₁₀ ), dodecyl alcohol (C ₁₂ ), tetradecyl alcohol (C ₁₄ ), hexadecyl alcohol (C ₁₆ ), heptadecyl alcohol (C ₁₇ ), octadecyl alcohol (C ₁₈ ), and eico Real alcohols (C ₂₀ ), and isomers of those not listed.

As said unsaturated aliphatic monohydric alcohol, what substituted the C-C single bond of the said saturated aliphatic monohydric alcohol with the C=C double bond, for example, oleyl alcohol is mentioned.

[Ether of (b ₂ ) chain hydrocarbon triol and at least one aliphatic monohydric alcohol]

(b ₂ ) As an ether of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol, for example, the following formulas (14) to (16):

(In the formula, each of R ¹⁴ to R ¹⁶ is a chain hydrocarbon)

The triether, diether, and monoether of glycerin and aliphatic monohydric alcohol are mentioned.

In addition, the chain hydrocarbon triol and the aliphatic monohydric alcohol are as described above.

[Ether of (b ₃ ) chain hydrocarbon diol and at least one aliphatic monohydric alcohol]

(b ₃ ) As an ether of a chain hydrocarbon diol and at least one aliphatic monohydric alcohol, the following formula (17):

R ¹⁷ OC _n H _2n OR ¹⁸ (17)

(Wherein, n is an integer of 2 to 6, and R ¹⁷ and R ¹⁸ are each a chain hydrocarbon)

Diether of C ₂ to C ₆ glycol of aliphatic monohydric alcohol, and the following formula (18):

R ¹⁷ OC _n H _2n OH (18)

(Wherein, n is an integer from 2 to 6, and R ¹⁷ is a chain hydrocarbon)

And monoethers of C ₂ to C ₆ glycols and aliphatic monohydric alcohols.

In addition, the chain hydrocarbon diol and the aliphatic monohydric alcohol are as described above.

[(c ₁ ) Ester of chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having 4 carboxyl groups and at least one aliphatic monohydric alcohol]

(c ₁ ) As an ester of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol, for example, its monoester, diester, tri Esters and tetraesters.

[(c ₂ ) Ester of chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having three carboxyl groups and at least one aliphatic monohydric alcohol]

(c ₂ ) As the ester of a chain hydrocarbon tricarboxylic acid having 3 carboxyl groups, hydroxy acid, alkoxy acid or oxo acid and at least one aliphatic monohydric alcohol, for example, its monoester, diester and tri And esters.

[(c ₃ ) Ester of chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol]

(c ₃ ) As an ester of a chain hydrocarbon dicarboxylic acid having two carboxyl groups, hydroxy acid, alkoxy acid or oxo acid and at least one aliphatic monohydric alcohol, for example, its monoester and diester Can be.

[Ether of (d ₁ ) aliphatic monohydric alcohol and aliphatic monohydric alcohol]

The aliphatic monohydric alcohol is as described above, and as the ether of the aliphatic monohydric alcohol and the aliphatic monohydric alcohol, the following formula (19):

R ¹⁹ OR ²⁰ (19)

(Wherein, each of R ¹⁹ and R ²⁰ is a chain hydrocarbon)

And compounds having.

In addition, the chain hydrocarbon is as described above.

[(d ₂ ) dialkyl ketone]

As the dialkyl ketone, the following formula (20):

R ²¹ COR ²² (20)

(In the formula, each of R ²¹ and R ²² is an alkyl group.)

And compounds having.

[Ester of (d ₃ ) fatty acid and aliphatic monohydric alcohol]

The fatty acid and the aliphatic monohydric alcohol are as described above, and as the ester of the fatty acid and the 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.

In addition, the chain hydrocarbon is as described above.

[(d ₄ ) Dialkyl carbonate]

As the dialkyl carbonate, the following formula (22):

R ²⁵ OC(=O)OR ²⁶ (22)

(In the formula, each of R ²⁵ and R ²⁶ is an alkyl group.)

And compounds having.

[(e ₁ ) PolyoxyC _{3 to} C ₆ alkylene glycol]

The polyoxyC _{3 to} C ₆ alkylene glycol is from the group consisting of i) an oxyC _{3 to} C ₆ alkylene skeleton, that is, an oxypropylene skeleton, an oxybutylene skeleton, an oxypentylene skeleton, and an oxyhexylene skeleton. A homopolymer having any one skeleton selected and having a hydroxyl group at the sock end, ii) A block copolymer having two or more skeletons selected from the group and having a hydroxyl group at the sock end, or iii) selected from the group It means a random copolymer having two or more kinds of skeletons and having hydroxyl groups at the ends of the socks.

The polyoxyC _{3 ~} C ₆ alkylene glycol, the following formula (23):

HO-(C _m H _2m O) _n -H (23)

(Where m is an integer from 3 to 6)

Is indicated by.

[(e ₂ ) Ester of polyoxyC _{3 to} C ₆ alkylene glycol and at least one fatty acid]

The polyoxyethylene C ₃ ~C ₆ alkylene ester of the glycol and at least one fatty acid, polyoxyethylene C ₃ ~C ₆ alkyl described in the section of "(e ₁₎ Polyoxyethylene C ₃ ~C ₆ alkylene glycol" One or both of the OH ends of renglycol is esterified with a fatty acid, that is, monoester and diester.

The fatty acids are as described above.

[(e ₃ ) Ether of polyoxyC _{3 to} C ₆ alkylene glycol and at least one aliphatic monohydric alcohol]

As the ether of the polyoxyC _{3 to} C ₆ alkylene glycol and at least one aliphatic monohydric alcohol, polyoxy C ₃ to described in the section of “(e ₁ ) PolyoxyC _{3 to} C ₆ alkylene glycol” One or both of the OH ends of the C ₆ alkylene glycol is etherified with an aliphatic monohydric alcohol, that is, monoether and diether.

The aliphatic monohydric alcohol is as described above.

The action of the body fluid-activating agent is as described in the international publication 2012/133724 pamphlet, the international publication 2013/129236 pamphlet, etc., but when the gel lotion contains a body fluid-activating agent as a lotion, the following The action is further obtained.

Since the gel lotion continuously releases, for example, sustained, a bodily fluid-activating agent into the skin contact area of the absorbent article, even if the bodily-liquid activating agent is lubricated into the interior of the absorbent article, it is liquid-permeable from the gel lotion A new body fluid activating agent is supplied to the surface of the layer, and the body fluid continues to slid into the interior of the absorbent article. As a result, even when the absorbent article is continuously used for a long period of time, stickiness does not easily occur in the liquid-permeable layer, and the liquid-permeable layer is kept in a soft state.

The said lotion contains the said body fluid activity-imparting agent, Preferably it is 0-50 mass %, More preferably, it is 0-40 mass %, More preferably, it is 0-30 mass %. It is in terms of gel formation.

The gel lotion is based on 100 parts by mass of the gelling agent and lotion, respectively, preferably 1 to 30 parts by mass and 70 to 99 parts by mass, more preferably 2 to 20 parts by mass and 80 to 80 parts by mass. 98 parts by mass, and more preferably 3 to 15 parts by mass and 85 to 97 parts by mass. When the proportion of the gelling agent is less than 1 part by mass, the formed gel lotion may become difficult to act as an elastic body, or may deform beyond the elastic limit of the gel lotion when a body pressure is applied. When the proportion of the gelling agent exceeds 30 parts by mass, the elasticity of the formed gel lotion is high, and the wearing feeling may be poor.

The gel lotion preferably has a compressive stress at 50% strain of 1 to 100 kPa, more preferably a compressive stress at 50% strain of 1 to 80 kPa, and more preferably a 50% strain of 1.5 to 60 kPa. It has compressive stress.

If the compressive stress at 50% strain is less than 1 kPa, the gel lotion may deform and break beyond the elastic limit when body pressure is applied, and if the compressive stress at 50% strain exceeds 100 kPa, the gel The elasticity of the lotion is high, and the gel lotion is hardly deformed when body pressure is applied, and the wearer may feel discomfort.

In conventional lotion coatings, skin care agents, and the like, techniques for making these components highly viscous (viscousized) are employed in order to fix the active ingredients in a predetermined place. However, when these are highly viscous, active ingredients (such as emollients) are trapped inside lotion coatings and skin care agents, making it difficult to exert their functions. In addition, conventional lotion coatings, skin care agents, and the like are only viscous substances, and when a body pressure such as a pressure is applied, they are not fixed in a predetermined place and move into the absorbent article, and continue to act on the wearer's skin. There is a problem that it is difficult.

On the other hand, the gel lotion exhibits behavior as an elastic body in a range where body pressure or the like is applied. Therefore, even if a high body pressure is applied to the gel lotion, it is only elastically deformed, and elastically recovers when the body pressure is lowered and returns to the original position (skin contact area) without being pushed between fibers of the top sheet or the like. . Therefore, the lotion contained in the gel lotion can perform its action at a desired position.

In this specification, the compressive stress at 50% strain of the gel lotion is measured as follows.

In addition, the matter which is not specifically specified is in accordance with JIS K 7181:2011 "Plastic-compression characteristic method" "Compressive stress at 3.7 x% strain".

(1) A compression tester was prepared in a constant temperature and humidity chamber at 20°C and 65% RH.

Moreover, in this example, the compact tabletop tester EzTest (made by Shimadzu Corporation) was used as a compression tester.

(2) A compression jig is attached to the compression tester.

In addition, in this embodiment, a compression jig made of stainless steel having a diameter of 120 mm was used.

(3) A gel lotion is set in a compression jig.

In addition, in this example, a gel lotion having a cylindrical shape with a diameter of 40 mm and a height of 8 mm was prepared.

(4) At a compression rate of 5 mm/min, the gel lotion is compressed until the amount of compression is 4 mm, that is, the strain is 50%, and the compressive force (N) is read.

(5) The compressive force (N) is converted into compressive stress (Pa).

In addition, as the compressive stress, the average value of the three measured values performed with different samples is adopted.

[Gamma agent]

The gel lotion, in addition to the gelling agent and lotion, may further include a gamma agent. Examples of the gamma agent include silicone oils, silicone resins, alkyl acrylate copolymers, surfactants, and long-chain aliphatic esters. When the gel lotion contains a gamma agent, the friction between the gel lotion and the wearer's skin at the time of wearing is reduced, so that an effect that the wearer's skin is less prone to inflammation can be expected.

The gel lotion preferably has a static friction coefficient of 0.01 to 1.00, more preferably 0.02 to 0.50, and even more preferably 0.03 to 0.03. This is because the wearer's skin is less prone to inflammation.

In order to achieve the above coefficient of static friction, the gel lotion is preferably 0.01 to 20 parts by mass, more preferably 0.05 to 100 parts by mass of the gel lotion (100 parts by mass of the gelling agent and lotion). ∼10 parts by mass, and more preferably 0.1 to 7 parts by mass.

The said static friction coefficient is measured as follows. In addition, the measurement is performed in a constant temperature and humidity chamber of 20°C x 65% RH.

(1) A gel lotion having a cylinder having a diameter of 40 mm and a height of 8 mm is prepared.

(2) As a static friction tester, a HEIDON tribogia μs (muse) TYPE: 94i is prepared (hereinafter sometimes referred to as "muse").

(3) A slider is set on the body of the muse.

(4) Turn on the power of the muse, and check that the display is “0.00”.

(5) Place the muse slider on the gel lotion.

(6) Press the Muse measurement button to read the displayed value.

(7) The measurement is carried out five times in total in different gel lotions, and the average value of these is employed.

The gel lotion may contain other components within a range that does not impair the effects of the present disclosure.

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

Examples of the other components include vitamins such as natural vitamins and synthetic vitamins. Examples of the vitamins include 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 , and vitamin C. Can be mentioned.

Examples of the vitamins include fat-soluble vitamins, such as the vitamin A group, the vitamin D group, the vitamin E group, and the vitamin K group.

The vitamin also includes derivatives thereof.

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

Examples of the other components include zeolites, such as natural zeolites, such as zeolite, tungsten, cobite, natrolite, quicksand, and tomsonite, and synthetic zeolite.

Examples of the at least one other component include cholesterol, hyaluronic acid, lecithin, and ceramide.

Further, examples of the other components include pharmaceuticals such as skin astringents, anti-acne agents, anti-wrinkle agents, anti-cellulite agents, whitening agents, antibacterial agents, and antifungal agents.

Examples of the skin astringents include oil-soluble skin astringents such as zinc oxide, aluminum sulfate, and tannic acid, and oil-soluble polyphenols. Examples of the oil-soluble polyphenols include natural oil-soluble polyphenols such as yellow-white extract, red pepper extract, clown mustard extract, chamomile extract, burdock extract, sage extract, basswood extract, western barley extract, birch extract, horsetail extract. , Sage extract, sage extract, hand walnut extract, hibiscus extract, loquat leaf extract, barley tree extract, hop extract, maroni extract, righteous extract, and the like.

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

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

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

Examples of the whitening agent include niacinamide, nurukic acid, arbutin, glucosamine and derivatives, phytosterol derivatives, ascorbic acid and derivatives thereof, and mulberry extract and placenta extract.

In addition, examples of the other components include anti-inflammatory components, pH adjusting agents, antibacterial agents, moisturizing agents, fragrances, such as aromatic oils, pigments, dyes, pigments, and plant extracts. Examples of the anti-inflammatory component include, for example, natural-derived anti-inflammatory agents, such as peony, golden, red pepper, chamomile, licorice, peach leaves, mugwort, shiso extract, synthetic anti-inflammatory agents, such as allantoin, dipotassium glycyrrhizinate, etc. have.

Examples of the pH adjusting agent include those for keeping the skin weakly acidic, for example, malic acid, succinic acid, citric acid, tartaric acid, and lactic acid.

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

Moreover, as said other component, what has a skin care action, for example, jojoba oil, camellia oil, and squalane oil are mentioned.

Moreover, mineral oil is mentioned as said other component.

In the absorbent article of the present disclosure, the liquid-permeable layer has a plurality of gel regions having the gel lotion and a non-gel region having no gel lotion in the skin contact region, and the skin non-contact region, the plurality It has a plurality of gel region overlap region and the non-gel region overlap region, respectively overlapping the gel region and the non-gel region and the thickness direction.

1 is a plan view showing an absorbent article 1 according to an embodiment of the present disclosure. The absorbent article 1 shown in FIG. 1, more specifically, a sanitary napkin includes a top sheet 2 as a liquid-permeable layer, a back sheet (not shown) as a liquid-impermeable layer, a top sheet 2, and Between the back sheets (not shown), the absorber 3 as an absorbent layer is provided. The absorbent article 1 shown in FIG. 1 also has a side sheet 4 and an embossed portion 5. In the absorbent article 1 shown in FIG. 1, the top sheet 2 as a liquid-permeable layer has a plurality of gel regions 8 having a gel lotion 6 and a gel lotion in the skin contact region 7. It has a non-gel region (9).

In the absorbent article 1 shown in FIG. 1, a plurality of line-shaped gel lotions 6 are continuously coated along the longitudinal direction of the absorbent article 1. In other words, the top sheet 2 has a plurality of line-shaped gel regions 8 which are parallel to each other and extend continuously in the longitudinal direction of the absorbent article 1.

FIG. 2 is a cross-sectional view of the region A in FIG. 1 in the II-II section, and for illustration purposes, only the top sheet 2 is shown. In FIG. 2, the top sheet 2 has a plurality of gel regions 8 having a gel lotion 6 and a non-gel region 9 having no gel lotion in the skin contact region 7, and the skin In the non-contact region 10, a plurality of gel regions 8 and a plurality of gel region overlap regions 11 and a non-gel region overlap region 12 are respectively overlapped in the thickness direction T. .

In FIG. 2, in two gel regions 8'and 8'' adjacent to each other, two proximity points 13' which are the closest points to each other of the two gel regions 8'and 8'' adjacent to each other And 13''), the midpoint 14' which is in the middle of the two proximity points 13' and 13'' and which is also in the non-gel region 9', and the two proximity points 13' and 13''), two proximity points (15' and 15'') and midpoints, overlapping in the thickness direction (T) and also present in the gel region overlap regions 11' and 11'', respectively (14'), the midpoint equivalent point 16' overlapping in the thickness direction T and also present in the non-gel region overlap region 12' is as follows i) to iii)

i) The water contact angles of the two proximity points 13' and 13'' are both 85° or more,

ii) the water contact angle at the midpoint 14' is greater than the water contact angle at the two proximity points 15' and 15', and

iii) The difference between the water contact angle at the midpoint 14' and the water contact angle at the midpoint equivalent point 16' is greater than -3 (°).

Have a relationship of

When the water contact angles of the two proximity points 13 ′ and 13 ″ are both 85° or more, it is difficult for body fluid to remain in the top sheet 2.

In addition, the water contact angle at the midpoint 14 is greater than the water contact angle at the two proximity points 15' and 15'', and the midpoint equivalent to the water contact angle at the midpoint 14 When the difference from the water contact angle at the point 16 is greater than -3 (°), the water contact angle gradually increases from the skin non-contact area 10 to the skin contact area 7, that is, the hydrophobicity gradually increases. Therefore, it is difficult for the body fluid once absorbed by the absorber to exit the top sheet 2 and reach the skin contact area 7. That is, it has excellent reweatability.

In the absorbent article of the present disclosure, i) the water contact angles of the two proximity points are both 85° or more, preferably both 90° or more, and more preferably both 100° or more. The water contact angle of the two proximity points is preferably 150° or less, and more preferably 140° or less. This is from the viewpoint of increasing the wettability while maintaining the permeability of the liquid-permeable layer of body fluid.

In addition, in the absorbent article of the present disclosure, ii) the water contact angle at the midpoint is greater than the water contact angle at two proximity points, preferably 5° or more, and more preferably 10° or more Big. The water contact angle at the midpoint is larger than the water contact angle at the two proximity points, preferably in the range of 50° or less, and more preferably in the range of 30° or less. It is from the viewpoint of increasing the gradient of the hydrophobicity of the liquid-permeable layer and increasing the wettability while maintaining the permeability of the liquid-permeable layer of the body fluid.

Further, in the absorbent article of the present disclosure, iii) the difference between the water contact angle at the midpoint and the water contact angle at the midpoint equivalent is greater than -3°, preferably greater than -1°, and more preferably It is greater than 3°. The difference between the water contact angle at the midpoint and the water contact angle at the midpoint equivalent point is preferably 30° or less, and more preferably 10° or less. This is from the viewpoint of the absorption rate of body fluids and the difficulty in retaining body fluids in the liquid-permeable layer.

In the absorbent article of the present disclosure, among the plurality of gel regions, at least a portion of the two gel regions adjacent to each other has a relationship of i) to iii) described above, and preferably 20 combinations of two gel regions adjacent to each other. % Or more, more preferably 40% or more, and even more preferably 60% or more has the relationship of i) to iii) described above. It is from the viewpoint of the effect of this disclosure.

In the absorbent article of the present disclosure, it is preferable to have the relationship of i) to iii) described above in the excrement contact area. It is from the viewpoint of the effect of this disclosure.

3 is a schematic view for explaining the effects of the present disclosure. FIG. 3 corresponds to a cross-sectional view taken along the section II-II of region A in FIG. 1. As shown in Fig. 3, the lotion 17 bleeding from the gel lotion 6, with time, diffuses in the plane direction P and the thickness direction T from the gel lotion 6, and the gel lotion ( Depending on the basis weight and arrangement of 6), the water contact angles of the two proximity points 13, the intermediate point 14, the proximity point equivalent point 15 and the intermediate point correspondence point 16 satisfy the aforementioned requirements , Has the effect of the present disclosure.

In this specification, the water contact angle is measured as follows.

(1) A contact angle meter manufactured by Kyowa Interface Science is prepared in a constant temperature room at 20°C.

(2) The sample to be measured is allowed to stand in the constant temperature room for 24 hours.

(3) Drops (distilled water) of 5 divisions are added dropwise to the place to be measured of the sample to be measured.

(4) The water contact angle is measured 5 seconds after dropping.

(5) Different samples are measured 10 times in the same place, and the average value is adopted.

In the embodiment shown in Fig. 1, since a plurality of gel regions 8 (gel lotions 6) are parallel to each other and extend in the longitudinal direction of the absorbent article 1, two proximity points and their The straight line connecting the midpoints forms the waterline of the gel region 8. In addition, a straight line connecting the two proximity points and the midpoint correspondence also forms a water line of the gel region 8.

4 is a plan view showing the absorbent article 1 according to another embodiment of the present disclosure. In the absorbent article 1 shown in Fig. 4, and more specifically, in a sanitary napkin, the top sheet 2 contains a gel lotion 6 in its skin-contacting region 7, and a plurality of dot-shaped The gel lotion 6 is coated in a zigzag shape. In other words, the top sheet 2 includes a plurality of dot-shaped gel lotions 6 arranged in a zigzag shape.

FIG. 5 is an enlarged view of area A in FIG. 4. In FIG. 5, in two gel regions 8'and 8'' adjacent to each other, two proximity points 13' and 13'' which are closest to each other, and their midpoint 14', Two proximal points (15' and 15'') of the two proximal points (13' and 13'') overlapping in the thickness direction and also present in the gel region overlap region (not shown), and the middle The midpoint equivalence point 16', which overlaps in the thickness direction of the point 14' and is also present in the non-gel area overlap area (not shown), is shown.

6 is a plan view showing the absorbent article 1 according to another embodiment of the present disclosure, and is a plan view corresponding to the area A in FIG. 4. The absorbent article 1 shown in FIG. 6 includes a gel lotion 6 in the skin contact area 7 of the top sheet 2, and a plurality of line-shaped gel lotions 6 are absorbent articles ( It is intermittently coated along the longitudinal direction of 1). In other words, the top sheet 2 includes a plurality of line-shaped gel lotions 6 which are parallel to each other and which intermittently extend in the longitudinal direction of the absorbent article 1.

In Fig. 6 also, in the two gel regions 8'and 8'' adjacent to each other, the two closest points 13' and 13'' which are the closest points to each other, and their midpoint 14' , Two proximity points 13' and 13', which overlap in the thickness direction and are also present in the gel region overlap region (not shown), with two proximity points 15' and 15', The midpoint 14', which overlaps in the thickness direction of the midpoint 14' and is also present in the non-gel region overlap region (not shown), is shown.

In the absorbent article of the present disclosure, the arrangement of the gel region having a gel lotion is not particularly limited as long as the relations of i) to iii) described above are satisfied. For example, the gel region is in the skin contact region of the liquid-permeable layer, It is arranged in a line shape or a dot shape.

The gel region is preferably 1 to 50% of the area of the liquid-permeable layer, more preferably 3 to 40%, and even more preferably in the range where the liquid-permeable layer overlaps in the thickness direction of the absorbent layer and the absorbent article. It occupies an area of 5 to 30%.

When the gel region occupies less than 1% of the area of the liquid-permeable layer, the effect of the present disclosure tends to be difficult to exert. When the gel region occupies more than 50% of the area of the liquid-permeable layer, the gel region does not absorb body fluids, and as a result, the region for absorbing body fluids becomes narrow, and the absorbency of the absorbent article tends to decrease.

Further, in order to achieve the coating region, the liquid-permeable layer, in the range overlapping in the thickness direction of the absorbent layer and the absorbent article, preferably the gel lotion, preferably 1 to 30 g/m ² , more preferably 2 to 20 g/m ² , and more preferably 3 to 10 g/m ² .

In this specification, the basis weight of the gel lotion is measured as follows.

(1) The range to be measured of the top sheet is cut with a sharp knife, for example, a replacement blade of a cutter, to obtain a sample.

(2) The area of the sample: S(m ² ) and mass: M ₀ (g) are measured.

(3) The sample is stirred for at least 3 minutes in a solvent in which a gel lotion is soluble, such as an aromatic solvent such as xylene, and the gel lotion is dissolved in a solvent.

(4) The sample is filtered on a filter paper whose mass is measured, and the sample is sufficiently washed with a solvent on the filter paper. The sample on the filter paper is dried in an oven at 100°C.

(5) The mass of the filter paper and the sample is measured, and by subtracting the mass of the filter paper, the mass of the sample after drying: M ₁ (g) is calculated.

(6) The basis weight of the gel lotion G _BW (g / m ² ), the following formula:

G _BW (g/m ² ) = [M ₀ (g)-M ₁ (g)]/S(m ² )

Calculate by

Further, in order to reduce the error, a plurality of samples are taken from a plurality of absorbent articles so that the total area of the samples exceeds 100 cm ² , and the experiment is repeated a plurality of times, and their average values are employed.

In the absorbent article of the present disclosure, when the liquid-permeable layer is a nonwoven fabric or a woven fabric, it is preferable that the nonwoven fabric or woven fabric is hydrophilized. Examples of the hydrophilization treatment include coating a hydrophilic agent on the surface of a nonwoven fabric or a woven fabric, and mixing a hydrophilic agent with a synthetic resin that is a raw material for a nonwoven fabric or a woven fabric. On the liquid-permeable layer, a lipophilic region derived from a hydrocarbon, a body fluid-activating agent, and the like, and a hydrophilic region derived from a hydrophilic agent rarely coexist, thereby exhibiting more lubricating performance and making it easier to quickly transfer body fluids to the absorber. Because.

The gel lotion can be prepared without particular limitation.

For example, an absorbent article can be produced by adding a gelling agent to a heated lotion, mixing to prepare a coating liquid, and coating the coating liquid on the liquid-permeable layer of the absorbent article to which the gel lotion is to be coated.

The gel lotion can be coated as a coating liquid containing a volatile solvent, for example, an alcohol-based solvent, an ester-based solvent, or an aromatic-based solvent, if desired. When the coating liquid contains a volatile solvent, since the viscosity of the coating liquid decreases, application can be facilitated, and simplification of the coating process such as heating during coating is unnecessary.

The coating method of the coating liquid is not particularly limited, and the coating liquid may be heated as necessary, and applied, for example, with a non-contact coater or a contact coater.

Examples of the non-contact type coater include a spiral coater, a curtain coater, a spray coater and a dip coater, and examples of the contact type coater include a slot coater and a pattern coater.

The coating liquid may be applied when manufacturing a material of a liquid-permeable layer, such as a nonwoven fabric, or may be applied to an absorbent article to be coated with a gel lotion in a manufacturing line for manufacturing the absorbent article. From the viewpoint of suppressing equipment investment, it is preferable to apply the coating liquid in the production line of the absorbent article, and in order to suppress the gel lotion from falling off and contaminating the line, the downstream process of the production line, specifically It is preferable to apply the said coating liquid just before sealing a product in an individual package.

Absorbent articles of the present disclosure include, for example, disposable diapers, urine pads, sanitary napkins, and panty liners.

Example

Hereinafter, the present disclosure will be described, for example, but the present disclosure is not limited to these examples.

[Example 1]

SEPS (styrene content: 20 mass%, weight average molecular weight: about 260,000) (hereinafter sometimes referred to as "SEPS-1") 2 parts, SEBS (styrene content: 31 mass%, weight average molecular weight: about 16 Only) (hereinafter sometimes referred to as "SEBS-2") 5 parts, Parlim 6 heated to about 140°C (Nichiyu Co., Ltd., floating isoparaffin, isobutene and n-butene copolymerized) , Branched chain hydrocarbon produced by continuously adding hydrogen, degree of polymerization: about 5 to about 10, weight average molecular weight: about 330) 90 parts, silicone oil (manufactured by Toray Dow Corning Co., Ltd., SH200-100cs, dimethylpolysiloxane, 25 A kinematic viscosity at 100° C./100 mm ² /s) was added to the mixture of 3 parts, and these were mixed with stirring for 5 hours to produce a mixture, and as shown in FIG. 1, applied to the skin contact area of the top sheet of the absorbent article. Thereby, an absorbent article No.1-1 was obtained. In the absorbent article No.1-1, the width of the gel region was 2 mm, the pitch was 4 mm, and the basis weight of the gel lotion was 30 g/m ² . In addition, the top sheet of the absorbent article No.1-1 was an air-through nonwoven fabric having a basis weight: 25 g/m ² (hereinafter sometimes referred to as “nonwoven fabric A”).

Absorbent articles No. 1-2 and 1-3 were obtained in the same manner as in absorbent article No. 1-1, except that the basis weight of the gel lotion and the top sheet of the absorbent article were changed as shown in Table 2. In addition, the top sheets of the absorbent articles Nos. 1-2 and 1-3 were air-through nonwoven fabrics having a basis weight of 27 g/m ² (hereinafter sometimes referred to as “nonwoven fabric B”).

Absorbent article No. 1-4 was obtained in the same manner as absorbent article No. 1-1 except that the formulation and basis weight of the gel lotion were changed as shown in Table 2.

Except for changing the basis weight and coating pattern of the gel lotion as shown in Table 2, in the same manner as in the absorbent article No. 1-1, the absorbent article No. 1-5 (sample for comparison) and 1-6 (for comparison) Sample).

Samples not coated with gel lotion were used as absorbent articles No. 1-7 (comparative samples) and 1-8 (comparative samples).

[Water contact angle]

With respect to the absorbent articles No.1-1 to 1-8, the water contact angle was evaluated. Table 2 also shows the results.

[Absorber transition speed and rewetability]

With respect to the absorbent articles No.1-1 to 1-8, the absorber transfer rate and rewetability were measured as follows.

On the top sheet of the absorbent article, an acrylic cylinder (outer diameter 60 mmφ, inner diameter 55 mmφ, 55 g) was placed, and in the cylinder, using a dropping funnel, artificial urine (in 10 L of ion-exchanged water, 200 g of urea) , 80 g of sodium chloride, 8 g of magnesium sulfate, 3 g of calcium chloride and pigment: prepared by dissolving about 1 g of blue No. 1) 80 mL was added dropwise at a rate of 8 mL/sec (first drop).

After dropping the artificial urine into the cylinder, the time until the accumulated artificial urine disappears in the cylinder was measured, and it was set as the "absorber transfer rate." Subsequently, if the artificial urine in the cylinder disappears, the acrylic cylinder is immediately removed, and 5 minutes after the first dropping starts, the filter paper is added to the place where the artificial urine was dropped (Quality filter paper No. of Advantech Toyo Co., Ltd.). 2, 100 mm×100 mm) 50 g minutes were stacked, and from above, the weight was placed so that the pressure was 35 g/cm ² . After 3 minutes, the filter paper was taken out, and the "rewet amount" was calculated according to the following formula.

Rewet amount (g) = mass of filter paper after the test (g)-original filter paper mass (g)

10 minutes after the start of the first dropping, the same operation as the first was repeated, and the second dropping was performed.

Table 2 also shows the amount of rewet in the second drop and the speed of the absorber transfer in the second drop.

[Table 2]

It can be seen that the absorbent articles No.1-1 to 1-4 have a low rewet rate and excellent reweatability compared to the absorbent articles No.1-5 to 1-8.

[Example 2]

2 parts of SEEPS (manufactured by Kurare Co., Sefton 4055, styrene content: 30 mass%, weight average molecular weight: about 250,000) (hereinafter sometimes referred to as "SEEPS-2"), heated to about 140°C Parim EX (Nichiyu Co., Ltd., flow isoparaffins, isobutene and n-butene copolymer, branch chain hydrocarbons produced by continuously adding hydrogen, kinematic viscosity at 37.8° C. 10 mm ² /s) 98 parts To and mixing them with stirring for 5 hours to form a mixture, and pour the mixture into a cylindrical vessel of 40 mm in diameter, up to 8 mm in height, and continue to cool the mixture, thereby forming a cylindrical shape of 40 mm in diameter and 8 mm in height. Gel lotion No.2-1 was obtained.

3 parts of SEPS-1, added to a mixture of 92 parts of Parim EX and 5 parts of silicone oil, heated to about 140° C., are mixed with stirring for 5 hours to produce a mixture, and the mixture is a cylindrical container with a diameter of 40 mm Then, to a height of 8 mm, and the mixture was subsequently cooled, a cylindrical gel lotion No.2-6 with a diameter of 40 mm and a height of 8 mm was obtained.

Gel lotion No.2-2 to 2-5, and No.2- in the same manner as gel lotion No.2-1 or gel lotion No.2-6, except that the formulation was changed as shown in Table 3. 7 to 2-20 were obtained.

In addition, although the outline of the compound of Table 3 is as follows, what is demonstrated in another location is abbreviate|omitted.

In addition, compressive stress and coefficient of static friction were evaluated at 50% strain of gel lotions No. 2-1 to 2-20. In addition, it is shown in Table 3.

SEEPS-1:

Styrene content: 30 mass%, weight average molecular weight: about 110,000

SEBS-1:

Styrene content: 30 mass%, weight average molecular weight: about 110,000

SEBS-2:

Styrene content: 31 mass%, weight average molecular weight: about 160,000

SEBS-3:

Styrene content: 33 mass%, weight average molecular weight: about 290,000

[Table 3-1]

[Table 3-2]

[Example 3]

Except according to the formulations shown in Table 4 below, according to the procedure in which gel lotion No. 2-6 of Example 1 was prepared, cylindrical gel lotions No. 3-1 to 3-4 with a diameter of 40 mm and a height of 8 mm were used. Got.

In addition, the outline of the compound of Table 4 is as follows.

·Nonion OP-80R:

Nichiyu Corporation, monosorbate sorbitan

KP-561P

Manufactured by Shin-Etsu Chemical Co., Ltd., acrylate/stearyl acrylate/dimethic acid acrylate copolymer

The static friction coefficient of gel lotion Nos. 3-1 to 3-4 was measured. Table 4 shows the results.

[Table 4]

[Example 4]

Gel lotion according to the procedure described in Table 2 below and in the order of preparing the gel lotion No.2-1 or No.2-6 of Example 2, except that the amount of 3 g was poured into a glass chalet with an inner diameter of 47 mm. No. 4-1 to 4-4 were obtained.

According to Example 4A of Patent Document 1, a lotion composition containing 65 mass% of mineral oil and 35 mass% of cetearyl alcohol was prepared, and the amount of 3 g was poured into a glass chalet having an inner diameter of 47 mm, and gel lotion No. 4-5 (comparative example) was prepared.

The gel lotions No. 4-1 to 4-5 were left in a constant temperature room at 35°C or 20°C for 30 minutes, and then, on each gel lotion, a 3 cm x 3 cm filter paper with mass was measured, The weight of 200 g was put on it, the weight was removed after 1 minute, and the change in mass of the filter paper was measured. Table 5 shows the results.

[Table 5]

As is evident from Table 5, gel lotions No. 4-1 to 4-4 were confirmed to release a certain amount of lotion regardless of temperature, and in cold to warm regions, the lotions continued to be released equally. What can be suggested.

On the other hand, it can be seen that the gel lotion No.4-5 (comparative example) becomes difficult to release the lotion when the temperature is low.

The present disclosure relates to the following J1 to J11.

[J1] An absorbent article having a liquid-permeable layer having a skin-contacting region and a skin-non-contacting region, a liquid-impermeable layer, an absorbent layer between the liquid-permeable layer and the liquid-impermeable layer, and a gel lotion, having a thickness direction,

The gel lotion contains a styrene-based elastomer as a gelling agent and a hydrocarbon as a lotion, and

The liquid-permeable layer has a plurality of gel regions having the gel lotion and a non-gel region having no gel lotion in the skin contact region, and the plurality of gel regions and the non-gel region in the skin non-contact region. Each having a plurality of gel region overlap regions and non-gel region overlap regions, each overlapping in the thickness direction,

Among the plurality of gel regions, in at least a portion of two gel regions adjacent to each other, the two proximity points, which are the closest points to each other, of the two gel regions adjacent to each other, are in the middle of the two proximity points, and the The midpoint existing in the non-gel region and the two proximity points overlap in the thickness direction, and also exist in the gel region overlapping region, and the two proximity points correspond to the midpoint and the midpoint overlap in the thickness direction. In addition, the midpoint equivalent point present in the overlap region of the non-gel region, i) to iii) below

i) The water contact angles of the two proximity points are both 85° or more,

ii) the water contact angle at the midpoint is greater than the water contact angle at the two proximity points, and

iii) the difference between the water contact angle at the midpoint and the water contact angle at the midpoint equivalent is greater than -3 (°)

It characterized in that it has a relationship of, the absorbent article.

[J2] The absorbent article according to J1, wherein the gel lotion has a compressive stress at 50% strain of 1 to 100 kPa.

[J3] The absorbent article according to J1 or J2, wherein the gel lotion contains the gelling agent and the lotion in a ratio of 1 to 30 parts by mass and 70 to 99 parts by mass, respectively, based on 100 parts by mass of these systems. .

[J4] The absorbent article according to any one of J1 to J3, wherein the styrenic elastomer includes a polystyrene block at the end of a sock and a polyolefin block therebetween.

[J5] The absorbent article according to any one of J1 to J4, wherein the styrenic elastomer contains 10 to 50 mass% polystyrene blocks and 50 to 90 mass% polyolefin blocks.

[J6] The absorbent article according to any one of J1 to J5, wherein the styrenic elastomer has a weight average molecular weight of 5,000 to 500,000.

[J7] The absorbent article according to any one of J1 to J6, wherein the gel lotion further contains a gamma agent.

[J8] The absorbent article according to any one of J1 to J7, wherein the gel lotion has a static friction coefficient of 0.01 to 1.00.

[J9] The lotion having an IOB of more than 0.00 and 0.60 or less, a kinematic viscosity of 0.01 to 80 mm ² /s at 40°C, a catch rate of 0.01 to 4.0 mass%, and a weight average molecular weight of less than 1,000. The absorbent article according to any one of J1 to J8, further comprising a body fluid activity-imparting agent.

[J10] The absorbent article according to any one of J1 to J9, wherein the gel lotion is arranged in a line shape or a dot shape in the skin contact area of the liquid-permeable layer.

[J11] The absorbent article according to any one of J1 to J10, which is a disposable diaper, sanitary napkin, or panty liner.

1: absorbent article, 2: top sheet, 3: absorber, 4: side sheet, 5: embossed portion, 6: gel lotion, 7: skin contact area, 8: gel area, 9: non-gel area, 10: non-contact skin Region, 11: Gel region overlap region, 12: Non-gel region overlap region, 13: Proximity point, 14: Midpoint, 15: Proximity point equivalence, 16: Midpoint equivalence point, 17: Lotion

Claims (11)

An absorbent article having a liquid-permeable layer having a skin-contacting region and a skin-non-contacting region, a liquid-impermeable layer, an absorbent layer between the liquid-permeable layer and the liquid-impermeable layer, and a gel lotion, having a thickness direction,
The gel lotion contains a styrene-based elastomer as a gelling agent and a hydrocarbon as a lotion,
The gel lotion is disposed in a skin contact region of the liquid-permeable layer in a plurality of line shapes extending in a predetermined direction so that the liquid-permeable layer satisfies the following relationship,
The liquid-permeable layer has a plurality of gel regions having the gel lotion and a non-gel region having no gel lotion in the skin contact region, and the plurality of gel regions and the non-gel region in the skin non-contact region. Two gel regions adjacent to each other in some or all of the two gel regions adjacent to each other having a plurality of gel region overlap regions and a non-gel region overlap region, each overlapping in the thickness direction, Of the two proximity points which are the closest points to each other on the center line extending in the predetermined direction, the intermediate point which is in the middle of the two proximity points and exists in the vigel region, and the two proximity points , Overlapping in the thickness direction and present in the overlapping region of the gel region, two proximity points and midpoint equivalence points of the intermediate point overlapping in the thickness direction and present in the non-gel region overlapping region, I) to iii) below
i) The water contact angles of the two proximity points are both 85° or more,
ii) the water contact angle at the midpoint is greater than the water contact angle at the two proximity points, and
iii) the difference between the water contact angle at the midpoint and the water contact angle at the midpoint equivalent is greater than -3 (°)
Absorbent article characterized by satisfying the relationship of. The absorbent article according to claim 1, wherein the gel lotion has a compressive stress at 50% strain of 1 to 100 kPa. The absorbency according to claim 1 or 2, wherein the gel lotion contains the gelling agent and lotion in a ratio of 1 to 30 parts by mass and 70 to 99 parts by mass, respectively, based on 100 parts by mass of the system. article. The absorbent article according to claim 1 or 2, wherein the styrenic elastomer comprises a polystyrene block at the sock end and a polyolefin block therebetween. The absorbent article according to claim 1 or 2, wherein the styrene-based elastomer contains 10 to 50 mass% of polystyrene blocks and 50 to 90 mass% of polyolefin blocks. The absorbent article according to claim 1 or 2, wherein the styrenic elastomer has a weight average molecular weight of 5,000 to 500,000. The absorbent article according to claim 1 or 2, wherein the gel lotion further comprises a gamma agent. The absorbent article according to claim 1 or 2, wherein the gel lotion has a static friction coefficient of 0.01 to 1.00. The ILO (Inorganic Organic Balance) of more than 0.00 and not more than 0.60 and a kinematic viscosity of 0.01 to 80 mm ² /s at 40°C and 0.01 to 4.0% by mass according to claim 1 or 2, An absorbent article further comprising a body fluid activity-imparting agent having a catch rate and a weight average molecular weight of less than 1,000. The absorbent article according to claim 1 or 2, which is a disposable diaper, sanitary napkin or panty liner. A method of manufacturing a liquid-permeable layer for an absorbent article having a skin-contacting area and a skin-non-contacting area,
A plurality of line-types extending in a predetermined direction such that a styrene-based elastomer as a gelling agent and a gel lotion containing a hydrocarbon as a lotion are in the skin contact region of the liquid-permeable layer and the liquid-permeable layer satisfies the following relationship: It includes the steps of placing,
The liquid-permeable layer has a plurality of gel regions having the gel lotion and a non-gel region having no gel lotion in the skin contact region, and the plurality of gel regions and the non-gel region in the skin non-contact region. Each of the two gel regions adjacent to each other in some or all of the two gel regions adjacent to each other having a plurality of gel region overlap regions and a non-gel region overlap region, which overlap each other in the thickness direction. , Two proximity points which are closest to each other on the center line extending in the predetermined direction, and two intermediate points which are in the middle of the two proximity points and exist in the vigel region, and the two proximity points, Two points of proximity corresponding to the overlapping region in the thickness direction and present in the overlapping region of the gel region, and points corresponding to the intermediate point overlapping in the thickness direction of the intermediate point and present in the overlapping region of the non-gel region, i )∼iii)
i) The water contact angles of the two proximity points are both 85° or more,
ii) the water contact angle at the midpoint is greater than the water contact angle at the two proximity points, and
iii) the difference between the water contact angle at the midpoint and the water contact angle at the midpoint equivalent is greater than -3 (°)
Manufacturing method characterized by satisfying the relationship of.

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