JP2013078376A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article that prevents a top part of a protrusion of a top sheet from sticking onto the skin of a wearer.SOLUTION: The absorbent article includes a liquid-permeable top sheet 2A provided on the side facing the skin, a liquid-impermeable back sheet provided on the side facing clothing, and a liquid-retaining absorber provided between the top sheet and back sheet. At least a portion of the skin-side surface of the top sheet 2A is formed of a resin film having a lubricant layer 27A formed on the skin-side surface, and the lubricant layer 27A is water-repellent and/or oil-repellent.

Description

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

  An absorbent article using a polyolefin film having a plurality of openings for allowing the wearer's body fluid to pass therethrough as a top sheet is known (for example, Patent Document 1). The wearer's body fluid passes through this opening and is absorbed by the absorber.

JP 2006-515539 A

  In countries such as India, it is customary to use one sanitary napkin for a long time by adhering to the surface of the sanitary napkin and wiping menstrual blood with toilet paper or the like when in the toilet. However, in the conventional absorbent article as described in Patent Document 1, a large amount of menstrual blood remains on the surface of the top sheet even after the menstrual blood adheres to the surface of the sanitary napkin and is wiped off with toilet paper. May end up. In this case, because of the menstrual blood remaining on the surface of the top sheet, the sanitary napkin may be unclean every time the sanitary napkin is seen in the toilet.

  An object of the present invention is to provide an absorbent article that has little or no body fluid remaining after wiping off body fluid such as menstrual blood adhering to a top sheet with toilet paper or the like.

The present invention employs the following configuration in order to solve the above problems.
That is, the present invention is a liquid-permeable top sheet provided on the skin side, a liquid-impermeable back sheet provided on the clothing side, and a liquid retaining property provided between the top sheet and the back sheet. And at least part of the skin side surface of the top sheet is formed of a resin film in which a lubricant layer is formed on the skin side surface. , Water repellency and / or oil repellency.

  According to the present invention, the body fluid adhered to the top sheet is wiped off with toilet paper or the like, so that there is little or no body fluid remaining.

FIG. 1 is a partially broken plan view of an absorbent article according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing a cross section taken along line AA of FIG. Drawing 3 is a figure for explaining the top sheet of the absorptive article of a 1st embodiment of the present invention. Drawing 4 is a figure for explaining the manufacturing method of the top sheet of the absorptive article of a 1st embodiment of the present invention. Drawing 5 is a figure for explaining a crevice formation roll used for a manufacturing method of a top sheet of an absorptive article of a 1st embodiment of the present invention. Drawing 6 is a figure for explaining an extension gear roll used for a manufacturing method of a top sheet of an absorptive article of a 1st embodiment of the present invention. FIG. 7 is a view for explaining a resin film stretched by a stretched gear roll. Drawing 8 is a figure for explaining the form of the resin film which changes in each process of the manufacturing method of the top sheet of the absorptive article of a 1st embodiment of the present invention. FIG. 9 is a photomicrograph showing the top sheet of the absorbent article according to the first embodiment of the present invention. FIG. 10 is a view for explaining the top sheet of the absorbent article according to the second embodiment of the present invention. Drawing 11 is a figure for explaining the manufacturing method of the top sheet of the absorptive article of the 2nd embodiment of the present invention. FIG. 12 is a view for explaining a composite sheet stretched by a stretched gear roll. FIG. 13 is a micrograph of the skin side of the top sheet in which an opening is formed in the resin film layer. FIG. 14 is a photomicrograph of the clothing side of the top sheet in which an opening is formed in the resin film layer. FIG. 15 is a view for explaining a modification of the top sheet of the absorbent article of the present invention. FIG. 16 is a view for explaining a modification of the top sheet of the absorbent article of the present invention. FIG. 17 is a diagram for explaining a modification of the top sheet of the present invention. FIG. 18 is a photomicrograph of the surface of Example and Comparative Example. FIG. 19 is a photograph showing the surface states of Examples and Comparative Examples after dropping high-viscosity artificial menstrual blood into Examples and Comparative Examples and allowing them to stand for 1 minute. FIG. 20 is a photograph showing the state of the surface of toilet paper after wiping off high-viscosity artificial menstrual blood from Examples and Comparative Examples. FIG. 21 is a photograph showing the surface states of Examples and Comparative Examples after wiping off high-viscosity artificial menstrual blood using toilet paper. FIG. 22 is a diagram illustrating a range in which the top sheet includes a blood modifying agent in Example 1. FIG. 23 is a photomicrograph of menstrual blood with or without a blood modifying agent. FIG. 24 is a view for explaining a method of measuring the surface tension.

-First embodiment-
Hereinafter, although the absorbent article of the 1st Embodiment of this invention is demonstrated with reference to drawings, this invention is not limited to what was described in drawing.
FIG. 1 is a partially broken plan view of an absorbent article according to a first embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view showing a cross section taken along line AA of FIG. The absorbent article 1 is provided between a liquid-permeable top sheet 2A provided on the skin side, a liquid-impermeable back sheet 3 provided on the clothing side, and the top sheet 2A and the back sheet 3. And a liquid retaining absorbent 4. The back sheet 3 extends in the width direction to form a pair of wing portions 5. An adhesive portion 6 is provided on the clothing side of the wing portion 5. In FIG. 1, the width direction of the absorbent article 1 is the X-axis direction, and the longitudinal direction is the Y-axis direction. Moreover, the planar direction of the absorbent article 1 is the XY direction.

  The top sheet 2 </ b> A moves body fluids such as urine and menstrual blood discharged from the wearer to the absorber 4. At least a part of the top sheet 2A has liquid permeability and is made of a resin film in which a large number of openings are formed to allow body fluid to pass therethrough. The resin film used as the top sheet 2A is made from a copolymer of olefin and other monomers such as acrylic acid ester and vinyl acetate, polyolefin, polyester, polypropylene, polyethylene, polyethylene terephthalate, polyamide, and cellulose acetate. The resin film used as the top sheet 2 is particularly preferably a copolymer of an olefin and another monomer, or a polyolefin because it is highly flexible and less irritating to the skin.

The basis weight of the top sheet 2A is preferably 1 g / m ² or more and 40 g / m ² or less, more preferably 10 g / m ² or more and 35 g / m ² or less. The thickness of the top sheet 2A is preferably 0.01 mm or more and 0.4 mm or less, more preferably 0.1 mm or more and 0.35 mm or less. When the thickness of the top sheet 2A is less than 0.01 mm, the below-described concealment property of the top sheet 2A may become too small. When the thickness of the top sheet 2A exceeds 0.4 mm, The rigidity of the top sheet 2A is increased, and the stimulation of the top sheet 2A on the wearer's skin may become too strong.

  The top sheet 2A has a concealing property so that the body fluid absorbed by the absorbent body 4 is not visible from the outside. The concealability of the top sheet 2A is generated by mixing a filler such as titanium oxide into the resin. When the filler is titanium oxide, the content of titanium oxide is preferably 1% or more and 50% or less, more preferably 3% or more and 15% or less with respect to the weight of the resin film. When the content of titanium oxide is less than 1% with respect to the weight of the resin film, the effect of concealing the body fluid absorbed by the absorber 4 in the top sheet 2A may be too small. If the content of titanium oxide exceeds 50% with respect to the weight of the resin film, it may be difficult to form a sheet of the resin containing titanium oxide.

  The top sheet 2A is bent so that the cross section in the width direction is substantially wavy in order to reduce the contact area between the skin of the wearer and the top sheet 2A and improve the touch of the top sheet 2A. . Note that the top sheet 2A may be bent so that the cross section in the longitudinal direction is substantially wavy. The top sheet 2A is bent so that its cross section is substantially wave-shaped. Thereby, when the wearer wipes body fluid such as menstrual blood with toilet paper or the like, the substantially wavy shape of the top sheet 2A is deformed by the pressure applied to the surface of the top sheet 2A, and the top sheet 2A becomes flat. Body fluid attached to the surface of the top sheet 2A can be easily wiped off.

With reference to FIG. 3, the top sheet 2A will be described in more detail.
The top sheet 2A that is bent so that the cross section in the width direction is substantially wavy has a protrusion 21A that extends in the longitudinal direction and a bottom 22A that is disposed between the adjacent protrusions 21A. The direction in which the protruding portion 21A extends is not limited to the longitudinal direction. The ridge portion 21A has a top portion 23A that contacts the wearer's skin and a side wall portion 24A. The height in the thickness direction of the protrusion 21A, that is, the difference in height in the thickness direction between the top 23A and the bottom 22A is preferably 0.1 mm or more and 5 mm or less. When the difference in height in the thickness direction between the top 23A and the bottom 22A is less than 0.1 mm, the bodily fluid once absorbed by the absorber 4 returns back through an opening 25A described later of the top sheet 2. There is a case. When the difference in height in the thickness direction between the top 23A and the bottom 22A is larger than 5 mm, the ridge 21A may fall when the wearer wears the absorbent article 1.

  The wall portion 24A is preferably not inclined with respect to the bottom portion 22A but inclined. That is, the angle formed by the bottom 22A and the wall 24A is preferably greater than 90 °. However, the angle formed by the bottom 22A and the wall 24A is preferably 165 ° or less. In order to make the angle between the bottom portion 22A and the wall portion 24A 90 ° or less, the resin film must be largely plastically deformed. Therefore, when the angle between the bottom portion 22A and the wall portion 24A is 90 ° or less, the top sheet The intensity of 2A may be very weak. When the angle formed by the bottom portion 22A and the wall portion 24A is larger than 165 °, the bodily fluid once absorbed by the absorber 4 returns backward through the opening 25A described later of the top sheet 2A or is absorbed through the opening 25A described later. The body fluid absorbed by the body 4 can be seen, and the concealability of the top sheet 2A may be reduced.

The wall portion 24A of the top sheet 2A has a plurality of openings 25A arranged in the extending direction (longitudinal direction) of the protrusion 21A. The opening 25A is a hole that penetrates the top sheet 2A, and the body fluid of the wearer is absorbed by the absorber 4 through the opening 25A. The opening area of one opening 25A is preferably 0.001 mm ² or more and 1 mm ² or less, more preferably 0.01 mm ² or more and 0.1 mm ² or less. When the opening area of one opening 25A is smaller than 0.001 mm ² , the body fluid of the wearer may not pass through the opening 25A. When the opening area of one opening 25A is larger than 1 mm ² , The bodily fluid once absorbed by the absorbent body 4 goes back through the opening 25A of the top sheet 2A, or the bodily fluid absorbed by the absorbent body 4 through the opening 25A becomes visible, and the concealment of the top sheet 2A is small. It may become.

  The ratio of the total opening area to the area of the top sheet 2A, that is, the opening ratio of the top sheet 2A is preferably 5% or more and 20% or less. When the opening ratio of the top sheet 2A is smaller than 5%, the permeability of the body fluid in the top sheet 2A may be deteriorated. When the opening ratio of the top sheet 2A is larger than 20%, the absorbent body 4 is once absorbed. The body fluid may go back through the opening 25A of the top sheet 2A, or the body fluid absorbed by the absorbent body 4 through the opening 25A may be visible, and the concealing property of the top sheet 2A may be reduced.

  The opening 25A is formed from the vicinity of the top 23A to the vicinity of the bottom 22A. For this reason, even when a large amount of bodily fluid is discharged from the wearer once, the absorbent article 1 can absorb the bodily fluid, so that leakage of bodily fluid from the absorbent article 1 can be suppressed.

  The top portion 23A of the top sheet 2A has a plurality of concave portions 26A arranged in the extending direction (longitudinal direction) of the protruding portion 21A. The shape of the recess 26A in the planar direction is, for example, a rhombus, and the length of one side of the rhombus is, for example, 0.15 mm, and the distance between two adjacent recesses is, for example, 0.34 mm. The shape of the recess 26A in the planar direction is not limited to a rhombus, and may be a square, a rectangle, a triangle, a circle, a star, a line (a straight line), or the like. Further, the size of the recess 26A is not limited to 0.15 mm × 0.15 mm, and the distance between two adjacent recesses is not limited to 0.34 mm. The depth of the recess 26A is not particularly limited as long as the skin of the wearer does not contact the bottom of the recess 26A when the skin of the wearer contacts the top 23A of the top sheet 2A. The bottom portion 22A of the top sheet 2A also has a plurality of concave portions 26A arranged in the extending direction (longitudinal direction) of the protruding portion 21A, but may not be present.

  Since the contact area of the top portion 23A that is in direct contact with the wearer's skin is reduced by the recess 26A provided in the top portion 23A, sticking of the absorbent article 1 to the skin during wearing is suppressed, and the wearer feels uncomfortable or itchy. It is possible to prevent the wearer from feeling skin problems such as rashes and the like. Further, a lubricant described later is stored in the recess 26A. As a result, the lubricant remains in the recess 26A even after the body fluid such as menstrual blood adhering to the top sheet 2A is wiped off with the toilet paper, and the lubricant remaining in the recess 26A spreads on the surface of the top sheet 2A, and the lubricant layer 27A. The lubricant can be replenished.

  By applying a lubricant to the surface of the top sheet 2A, a lubricant layer 27A is formed on the skin side surface of the top sheet 2A. With this lubricant layer 27A, the body fluid such as menstrual blood adhering to the top sheet 2A is wiped off with toilet paper or the like, so that there is little or no body fluid remaining. The lubricant layer 27A may be formed on the entire surface of the top sheet 2A, or the lubricant layer 27A is formed on the top sheet 2A only in a region corresponding to a region where the body fluid of the wearer in the absorbent article 1 is discharged. It may be. That is, the lubricant layer 27A may be formed on at least a part of the surface of the top sheet 2A.

  The lubricant layer 27A has water repellency and / or oil repellency. The lubricant of the lubricant layer 27A is not particularly limited as long as it is a compound that can impart water repellency and / or oil repellency to the top sheet 2A, but is preferably a fluorine compound, a silicon compound, or a blood modifier. The lubricant of the lubricant layer 27A is more preferably a blood modifying agent. The blood modifying agent has an IOB of 0 to 0.60, a melting point of 45 ° C. or lower, and a water solubility of 0.05 g or lower at 25 ° C.

  Since the melting point of the blood modifying agent is 45 ° C. or lower, even when the blood modifying agent is solid, the blood modifying agent liquefies when it comes into contact with body fluid at 30 to 40 ° C. Since a liquid blood modifying agent exists between the body fluid and the top sheet 2A, the body fluid adhering to the top sheet 2A is wiped off with toilet paper or the like, so that there is little or no body fluid remaining. It is thought that it can be done.

  The blood modifying agent has a mechanism for lowering blood viscosity and surface tension. Thereby, when a high-viscosity bodily fluid adheres to the top sheet 2A, the viscosity and surface tension of the adhering bodily fluid are reduced, so that the adhering bodily fluid can be easily wiped off.

IOB (Inorganic Organic Balance) is an index indicating a balance between hydrophilicity and lipophilicity. In the present specification, the following formula by Oda et al.
IOB = value calculated by inorganic value / organic value.

The inorganic value and the organic value are represented by Fujita Minoru, “Prediction of organic compounds and conceptual diagram of organic compounds” in the field of chemistry Vol. 11, no. 10 (1957) p. 719-725).
Table 1 below summarizes the organic and inorganic values of the major groups by Fujita.

For example, in the case of an ester of tetradecanoic acid having 14 carbon atoms and dodecyl alcohol having 12 carbon atoms, the organic value is 520 (CH ₂ , 20 × 26), and the inorganic value is 60 (—COOR, 60 × 1), so that IOB = 0.12.

  In the blood modifying agent, the IOB is about 0 to about 0.60, preferably about 0 to about 0.50, more preferably about 0 to about 0.40, and about 0. More preferred is ~ 0.30. This is because the lower the IOB, the higher the organicity and the higher the affinity with blood cells.

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

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

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

Further, the melting point of the blood modifying agent can be properly used according to the climate, the length of wearing time, and the like. For example, in an area where the average temperature is 10 ° C. or less, even if the menstrual blood is excreted and then cooled by the ambient temperature by adopting a blood modifying agent having a melting point of about 10 ° C. or less, It is considered that the blood modifying agent can stably modify blood.
Further, when the absorbent article is used for a long time, the melting point of the blood modifying agent is preferably higher in the range of 45 ° C. or lower. This is because the blood modifying agent is difficult to move even when it is worn for a long time, and is hardly affected by sweat, friction at the time of wearing, and the like.

The above-mentioned water solubility was determined by adding 0.05 g of sample to 100 g of deionized water at 25 ° C. and allowing it to stand for 24 hours. After 24 hours, lightly stirred as necessary to determine whether the sample was dissolved. Thus, it can be determined whether or not the water solubility is 0.05 g or less.
In the present specification, regarding dissolution in water, “dissolution” includes a case where the sample is completely dissolved in deionized water to form a uniform mixture and a case where the sample is completely emulsified. “Complete” means that there is no lump of sample in deionized water.

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

In the present specification, the solubility in 100 g of water at 25 ° C. may be simply referred to as “water solubility”.
The blood modifying agent can have a water solubility of about 0 g. Therefore, in the blood modifying agent, the lower limit of the water solubility is about 0 g.

Examples of the blood modifying agent include compounds having the following structure.
(I) hydrocarbons,
(Ii) a compound in which at least one carbonyl bond (—CO—) and / or at least one ether bond (—O—) is inserted between C—C single bonds of hydrocarbon, or (iii) At least one carbonyl bond (—CO—) and / or at least one ether bond (—O—) is inserted between the C—C single bonds, and at least one hydrogen atom on the hydrocarbon is a carboxyl group ( -COOH) or a compound substituted with a hydroxyl group (-OH).

  In the present specification, “hydrocarbon” means a compound composed of carbon and hydrogen, and is a chain hydrocarbon, for example, a paraffinic hydrocarbon (also referred to as an alkane, which does not include a double bond and a triple bond). , Olefinic hydrocarbons (including one double bond, also referred to as alkene), acetylenic hydrocarbons (including one triple bond, also referred to as alkyne), and the group consisting of double and triple bonds And hydrocarbons containing two or more bonds selected from the above, and cyclic hydrocarbons such as aromatic hydrocarbons and alicyclic hydrocarbons.

The hydrocarbons are preferably chain hydrocarbons and alicyclic hydrocarbons, more preferably chain hydrocarbons, two paraffin hydrocarbons, olefin hydrocarbons, and two double bonds. More preferred are hydrocarbons (not including triple bonds), and most preferred are paraffinic hydrocarbons.
The chain hydrocarbon includes a straight chain hydrocarbon and a branched chain hydrocarbon.

  In the compounds (ii) and (iii) above, when two or more ether bonds (—O—) are inserted, the ether bonds (—O—) are not adjacent to each other. Accordingly, the compounds (ii) and (iii) do not include compounds having a continuous ether bond (so-called peroxide).

  Further, in the compound (iii), at least one hydrogen atom on the hydrocarbon is more preferably a hydroxyl group (-than a compound in which at least one hydrogen atom on the hydrocarbon is substituted with a carboxyl group (-COOH). Compounds substituted with OH) are preferred. As shown in Table 1, since the carboxyl group binds to menstrual metals and the like, and the inorganic value increases significantly from 150 to 400 or more, the blood modifying agent having a carboxyl group is used at the time of use. This is because the value of IOB exceeds about 0.6, and the affinity with blood cells may be reduced.

The blood modifying agent may preferably be a compound having the following structure.
(I ′) hydrocarbon,
(Ii ′) at least one carbonyl bond (—CO—), at least one ester bond (—COO—), at least one carbonate bond (—OCOO—) and / or between the C—C single bonds of the hydrocarbon; A compound in which at least one ether bond (—O—) is inserted, or (iii ′) at least one carbonyl bond (—CO—), at least one ester bond (— COO-), at least one carbonate bond (-OCOO-) and / or at least one ether bond (-O-), and at least one hydrogen atom on the hydrocarbon is a carboxyl group (-COOH) or A compound substituted with a hydroxyl group (—OH).

  In the compounds (ii ′) and (iii ′) above, when two or more bonds are inserted, that is, a carbonyl bond (—CO—), an ester bond (—COO—), a carbonate bond (—OCOO—) And two or more bonds selected from ether bonds (—O—) are inserted, the bonds are not adjacent to each other, and at least one carbon atom is interposed between the bonds. .

  More preferably, the blood modifying agent is more preferably about 1.8 or less carbonyl bonds (—CO—) and 2 or less ester bonds (—COO—) per 10 carbon atoms in a hydrocarbon. About 1.5 or less of bonds (—OCOO—), about 6 or less of ether bonds (—O—), about 0.8 or less of carboxyl groups (—COOH), and / or hydroxyl groups (—OH) Can be a compound having about 1.2 or less.

The blood modifying agent is more preferably
(A) an ester of a compound having 2 to 4 hydroxyl groups and a compound having 1 carboxyl group,
(B) an ether of a compound having 2 to 4 hydroxyl groups and a compound having 1 hydroxyl group,
(C) an ester of a compound having 2 to 4 carboxyl groups and a compound having 1 hydroxyl group,
(D) Any one selected from the group consisting of a carbonyl bond (—CO—), an ester bond (—COO—), a carbonate bond (—OCOO—) and an ether bond (—O—) is inserted into the hydrocarbon. Compound,
(E) poly C _{3 ~ 6} alkylene glycol or its alkyl ester or alkyl ether, or (F) a chain hydrocarbon,
Can be.
Hereinafter, (A) to (F) will be described in detail.

[(A) Esters of a compound having 2 to 4 hydroxyl groups and a compound having 1 carboxyl group]
(A) An ester of a compound having 2 to 4 hydroxyl groups and a compound having one carboxyl group (hereinafter sometimes referred to as “compound (A)”) has 4, 3, Or an ester of a compound having two hydroxyl groups and a compound having one carboxyl group, and all hydroxyl groups are esterified as long as they are in the range having the above-mentioned IOB, melting point and water solubility. Not necessary.

Examples of the compound having 2 to 4 hydroxyl groups include chain hydrocarbon tetraols such as alkane tetraols such as pentaerythritol, chain hydrocarbon triols such as alkane triols such as glycerin, and the like. Examples include chain hydrocarbon diols such as alkane diols such as glycols. Examples of the compound having one carboxyl group include a compound in which one hydrogen atom on a hydrocarbon is substituted with one carboxyl group (—COOH), for example, a fatty acid.
Examples of the compound (A) include (A ₁ ) an ester of a chain hydrocarbon tetraol and a fatty acid, (A ₂ ) an ester of a chain hydrocarbon triol and a fatty acid, and (A ₃ ) a chain hydrocarbon diol. And esters of fatty acids.

[Ester of (A ₁ ) chain hydrocarbon tetraol and fatty acid]
Examples of the ester of the chain hydrocarbon tetraol and the fatty acid include the following formula (1):

Tetraesters of pentaerythritol and fatty acids of the following formula (2):

Triesters of pentaerythritol and fatty acids of the following formula (3):

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

And monoesters of pentaerythritol and fatty acids.
(In the formula, R ^{1 to} R ⁴ are each a chain hydrocarbon)

As the fatty acid (R ¹ COOH, R ² COOH, R ³ COOH, and R ⁴ COOH) constituting the ester of pentaerythritol and fatty acid, the ester of pentaerythritol and fatty acid has the above-mentioned IOB, melting point and water solubility. as long as it satisfies the requirement is not particularly limited, for example, saturated fatty acids, for example, saturated fatty acids C ₂ -C _30, for example, acetic acid (C ₂₎ (C ₂ indicates the number of carbon atoms, R ¹ C, Corresponding to the carbon number of R ² C, R ³ C or R ⁴ C, the same shall apply hereinafter), propanoic acid (C ₃ ), butanoic acid (C ₄ ) and isomers thereof such as 2-methylpropanoic acid (C ₄ ), pentanoic acid (C ₅₎ and isomers thereof such as 2-methylbutanoic acid (C _5), 2,2-dimethyl propanoic acid (C _5), hexanoic acid (C _6), heptanoic acid (C ₇₎ Octanoic acid (C ₈₎ and isomers thereof, e.g., 2-ethylhexanoic acid (C _8), nonanoic acid (C _9), decanoic acid (C _10), dodecanoic acid (C _12), tetradecanoic acid (C ₁₄₎ Hexadecanoic acid (C ₁₆ ), heptadecanoic acid (C ₁₇ ), octadecanoic acid (C ₁₈ ), eicosanoic acid (C ₂₀ ), docosanoic acid (C ₂₂ ), tetracosanoic acid (C ₂₄ ), hexacosanoic acid (C ₂₆ ), Examples include octacosanoic acid (C ₂₈ ), triacontanoic acid (C ₃₀ ), and the like, and isomers thereof (except those described above).

The fatty acid can also be an unsaturated fatty acid. Examples of the unsaturated fatty acid include C _{3 to} C ₂₀ unsaturated fatty acids such as monounsaturated fatty acids such as crotonic acid (C ₄ ), myristoleic acid (C ₁₄ ), palmitoleic acid (C ₁₆ ), Oleic acid (C ₁₈ ), elaidic acid (C ₁₈ ), vaccenic acid (C ₁₈ ), gadoleic acid (C ₂₀ ), eicosenoic acid (C ₂₀ ), etc., diunsaturated fatty acids such as linoleic acid (C ₁₈ ), Triunsaturated fatty acids such as eicosadienoic acid (C ₂₀ ), such as linolenic acid such as α-linolenic acid (C ₁₈ ) and γ-linolenic acid (C ₁₈ ), pinolenic acid (C ₁₈ ), eleostearic acid, For example, α-eleostearic acid (C ₁₈ ) and β-eleostearic acid (C ₁₈ ), mead acid (C ₂₀ ), dihomo-γ-linolenic acid (C ₂₀ ), eicosatrienoic acid (C ₂₀ ) Etc., tetraunsaturated Fatty acid, e.g., stearidonic acid (C _20), arachidonic acid (C _20), eicosatetraenoic acid (C _20), etc., penta-unsaturated fatty acids, for example, bosseopentaenoic acid (C _18), eicosapentaenoic acid (C ₂₀ ) And the like, as well as these partial hydrogenated products.

The ester of pentaerythritol and fatty acid is an ester of pentaerythritol and a fatty acid derived from a saturated fatty acid, that is, an ester of pentaerythritol and a saturated fatty acid, considering the possibility of modification by oxidation or the like. preferable.
The ester of pentaerythritol and fatty acid is preferably a diester, triester or tetraester, more preferably a triester or tetraester, in order to reduce IOB and make it more hydrophobic. And most preferably tetraesters.

In the tetraester of pentaerythritol and fatty acid, the total number of carbon atoms of the fatty acid constituting the tetraester of pentaerythritol and fatty acid, that is, in the above formula (1), R ¹ C, R ² C, R ³ C and When the total number of carbon atoms in the R ⁴ C portion is 15, IOB is 0.60. Therefore, in the tetraester of pentaerythritol and fatty acid, the IOB satisfies the requirement of about 0 to about 0.6 when the total number of carbon atoms is about 15 or more.
In the tetraester of pentaerythritol and fatty acid, for example, pentaerythritol, hexanoic acid (C ₆ ), heptanoic acid (C ₇ ), octanoic acid (C ₈ ), for example, 2-ethylhexanoic acid (C ₈ ), Examples thereof include tetraesters with nonanoic acid (C ₉ ), decanoic acid (C ₁₀ ) and / or dodecanoic acid (C ₁₂ ).

In the triester of pentaerythritol and fatty acid, the total number of carbon atoms of the fatty acid constituting the triester of pentaerythritol and fatty acid, that is, in the above formula (2), R ¹ C, R ² C and R ³ C moieties When the total number of carbon atoms is 19, IOB is 0.58. Therefore, in the triester of pentaerythritol and fatty acid, the IOB satisfies the requirement of about 0 to about 0.6 when the total number of carbon atoms of the fatty acid is about 19 or more.

In the diester of pentaerythritol and fatty acid, the total number of carbon atoms of the fatty acid constituting the diester of pentaerythritol and fatty acid, that is, the total number of carbon atoms of the R ¹ C and R ² C moieties in the above formula (3) is In the case of 22, the IOB is 0.59. Therefore, in the diester of pentaerythritol and fatty acid, the IOB satisfies the requirement of about 0 to about 0.6 when the total number of carbon atoms of the fatty acid is about 22 or more.

In the monoester of pentaerythritol and fatty acid, the number of carbons of the fatty acid constituting the monoester of pentaerythritol and fatty acid, that is, in the above formula (4), the IOB is 25 when the carbon number of the R ¹ C portion is 25. 0.60. Therefore, in the monoester of pentaerythritol and fatty acid, when the fatty acid has about 25 or more carbon atoms, IOB satisfies the requirement of about 0 to about 0.6.
In the above calculation, the influence of double bonds, triple bonds, iso branches, and tert branches is not taken into consideration.

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

[(A ₂ ) Ester of Chain Hydrocarbon Triol and Fatty Acid]
Examples of the ester of the chain hydrocarbon triol and the fatty acid include the following formula (5):

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

A diester of glycerin and a fatty acid, and the following formula (7):

(Wherein R ^{5 to} R ⁷ are each a chain hydrocarbon)
And monoesters of glycerin and fatty acids.

As the fatty acid (R ⁵ COOH, R ⁶ COOH and R ⁷ COOH) constituting the ester of the glycerin and the fatty acid, as long as the ester of glycerin and the fatty acid satisfies the requirements for the IOB, melting point and water solubility, There is no particular limitation, and examples include fatty acids listed in “(A ₁ ) ester of chain hydrocarbon tetraol and fatty acid”, that is, saturated fatty acid and unsaturated fatty acid, and may be modified by oxidation or the like. In view of the above, an ester of glycerin and a fatty acid derived from a saturated fatty acid, that is, an ester of glycerin and a saturated fatty acid is preferable.
The ester of glycerin and fatty acid is preferably a diester or triester and more preferably a triester in order to reduce IOB and make it more hydrophobic.

The triester of glycerin and fatty acid is also referred to as triglyceride. For example, triester of glycerin and octanoic acid (C ₈ ), triester of glycerin and decanoic acid (C ₁₀ ), glycerin and dodecanoic acid (C ₁₂ ) And triesters of glycerin with 2 or 3 fatty acids, and mixtures thereof.

Examples of the triesters of glycerin and two or more fatty acids include triesters of glycerin and octanoic acid (C ₈ ) and decanoic acid (C ₁₀ ), glycerin, octanoic acid (C ₈ ), and decane. Acid (C ₁₀ ) and Dodecanoic acid (C ₁₂ ) Triester, Glycerin, Octanoic acid (C ₈ ), Decanoic acid (C ₁₀ ), Dodecanoic acid (C ₁₂ ), Tetradecanoic acid (C ₁₄ ), Hexadecanoic acid Examples thereof include triesters with (C ₁₆ ) and octadecanoic acid (C ₁₈ ).

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

In the triester of glycerin and fatty acid, the total number of carbon atoms of the fatty acid constituting the triester of glycerin and fatty acid, that is, in the formula (5), R ⁵ C, R ⁶ C and R ⁷ C moieties When the total number of carbon atoms is 12, the IOB is 0.60. Therefore, in the triester of the glycerin and the fatty acid, the IOB satisfies the requirement of about 0 to about 0.6 when the total number of carbon atoms of the fatty acid is about 12 or more.
The triester of glycerin and a fatty acid is a so-called fat and is a component that can constitute a human body, and thus is preferable from the viewpoint of safety.

  Commercial products of triesters of glycerin and fatty acid include tricoconut oil fatty acid glyceride, NA36, panacet 800, panacet 800B and panacet 810S, and tri-C2L oil fatty acid glyceride and tri-CL oil fatty acid glyceride (above, manufactured by NOF Corporation). ) And the like.

The diester of glycerin and fatty acid is also referred to as diglyceride. For example, diester of glycerin and decanoic acid (C ₁₀ ), diester of glycerin and dodecanoic acid (C ₁₂ ), glycerin and hexadecanoic acid (C ₁₆ ) Examples include diesters, diesters of glycerin and two fatty acids, and mixtures thereof.
In the diester of glycerin and fatty acid, the total number of carbon atoms of the fatty acid constituting the diester of glycerin and fatty acid, that is, the total number of carbon atoms of the R ⁵ C and R ⁶ C moieties in the formula (6) is 16. The IOB is 0.58. Therefore, in the diester of glycerin and fatty acid, the IOB satisfies the requirement of about 0 to about 0.6 when the total number of carbon atoms of the fatty acid is about 16 or more.

The monoester of the glycerin and the fatty acid is also referred to as monoglyceride, and examples thereof include glycerin octadecanoic acid (C ₁₈ ) monoester, glycerin docosanoic acid (C ₂₂ ) monoester, and the like.
In the monoester of glycerin and fatty acid, the number of carbon atoms of the fatty acid constituting the monoester of glycerin and fatty acid, that is, when the carbon number of the R ⁵ C moiety in the formula (7) is 19, the IOB is 0.59. It becomes. Therefore, in the monoester of the glycerin and the fatty acid, when the carbon number of the fatty acid is about 19 or more, the IOB satisfies the requirement of about 0 to about 0.6.

[Ester of (A ₃ ) chain hydrocarbon diol and fatty acid]
Examples of the ester of the chain hydrocarbon diol and the fatty acid include C _{2 to} C ₆ chain hydrocarbon diols such as C _{2 to} C ₆ glycols such as ethylene glycol, propylene glycol, butylene glycol, and pliers. Examples thereof include monoesters or diesters of lene glycol or hexylene glycol and fatty acids.

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

In the ester of C ₂ -C ₆ glycol and fatty acid, the fatty acid to be esterified (corresponding to R ⁸ COOH and R ⁹ COOH in formula (8) and formula (9)) is C ₂ -C ₆ glycol. And esters of fatty acids are not particularly limited as long as they satisfy the above requirements for IOB, melting point and water solubility, and are listed in, for example, “(A ₁ ) ester of chain hydrocarbon tetraol and fatty acid”. Fatty acids, that is, saturated fatty acids and unsaturated fatty acids, and saturated fatty acids are preferred in consideration of the possibility of modification by oxidation or the like.

In the diester of butylene glycol (k = 4) and a fatty acid represented by the formula (8), when the total number of carbon atoms in the R ⁸ C and R ⁹ C moieties is 6, IOB is 0.6. Therefore, in the diester of butylene glycol (k = 4) and fatty acid represented by formula (8), when the total number of carbon atoms is about 6 or more, IOB satisfies the requirement of about 0 to about 0.6. Moreover, in the monoester of ethylene glycol (k = 2) and a fatty acid represented by the formula (9), when the carbon number of the R ⁸ C portion is 12, the IOB is 0.57. Therefore, in the monoester of ethylene glycol (k = 2) and a fatty acid represented by formula (9), when the fatty acid has about 12 or more carbon atoms, the IOB satisfies the requirement of about 0 to about 0.6. .

The ester of a C ₂ -C ₆ glycol and fatty acids, in consideration of the potential for degradation by oxidation and the like, derived from saturated fatty acids, esters of C ₂ -C ₆ glycol and fatty acid, Nachi Suwa, C ₂ it is preferable -C ₆ glycol and an ester of saturated fatty acids.

As the ester of a C ₂ -C ₆ glycol and fatty acid, to reduce the IOB, in order to more hydrophobic, from large glycol carbon number, esters of glycols and fatty acids, for example, butylene glycol It is preferably an ester of glycol and fatty acid derived from pentylene glycol or hexylene glycol.
Furthermore, the ester of the C ₂ -C ₆ glycol and the fatty acid is preferably a diester in order to reduce IOB and make it more hydrophobic.
Examples of commercial products of esters of the C ₂ -C ₆ glycols with fatty acids, for example, COMPOL BL, COMPOL BS (products of NOF Corporation) and the like.

[(B) an ether of a compound having 2 to 4 hydroxyl groups and a compound having 1 hydroxyl group]
(B) The ether of a compound having 2 to 4 hydroxyl groups and a compound having one hydroxyl group (hereinafter sometimes referred to as “compound (B)”) has 4, 3, Or an ether of a compound having two hydroxyl groups and a compound having one hydroxyl group, so long as it is in the range having the above-mentioned IOB, melting point and water solubility, all hydroxyl groups are etherified. Not necessary.

Examples of the compound having 2 to 4 hydroxyl groups include those listed in “Compound (A)”, for example, pentaerythritol, glycerin, and glycol.
Examples of the compound having one hydroxyl group include a compound in which one hydrogen atom of a hydrocarbon is substituted with one hydroxyl group (—OH), for example, an aliphatic monohydric alcohol, for example, saturated Examples include aliphatic monohydric alcohols and unsaturated aliphatic monohydric alcohols.

Examples of the saturated aliphatic monohydric alcohol include C _{1 to} C ₂₀ saturated aliphatic monohydric alcohols such as methyl alcohol (C ₁ ) (C ₁ represents the number of carbon atoms, the same shall apply hereinafter), ethyl alcohol ( C _2), propyl alcohol (C ₃₎ and isomers thereof, for example, isopropyl alcohol (C _3), butyl alcohol (C ₄₎ and isomers thereof, for example, sec- butyl alcohol (C ₄₎ and tert- butyl alcohol (C ₄ ), pentyl alcohol (C ₅ ), hexyl alcohol (C ₆ ), heptyl alcohol (C ₇ ), octyl alcohol (C ₈ ) and isomers thereof such as 2-ethylhexyl alcohol (C ₈ ), nonyl alcohol (C ₉ ), decyl alcohol (C ₁₀ ), dodecyl alcohol (C ₁₂ ), tetradecyl al Cole (C ₁₄ ), Hexadecyl alcohol (C ₁₆ ), Hepradecyl alcohol (C ₁₇ ), Octadecyl alcohol (C ₁₈ ), and Eicosyl alcohol (C ₂₀ ), and their unlisted isomers It is done.
Examples of the unsaturated aliphatic monohydric alcohol include those obtained by substituting one of the C—C single bonds of the saturated aliphatic monohydric alcohol with a C═C double bond, such as oleyl alcohol. It is commercially available from Shin Nippon Rika Co., Ltd. under the names of the Rica Coal series and the Angelo All series.

Examples of the compound (B) include (B ₁ ) ethers of chain hydrocarbon tetraols and aliphatic monohydric alcohols, such as monoethers, diethers, triethers and tetraethers, preferably diethers, triethers and tetraethers. Ethers, more preferably triethers and tetraethers, and even more preferably tetraethers, ethers of (B ₂ ) chain hydrocarbon triols and aliphatic monohydric alcohols, such as monoethers, diethers and triethers, preferably diethers And triethers, and more preferably triethers, and ethers of (B ₃ ) chain hydrocarbon diols and aliphatic monohydric alcohols, such as monoethers and diethers, and preferably diethers.

Examples of the ether of the chain hydrocarbon tetraol and the aliphatic monohydric alcohol include, for example, the following formulas (10) to (13):

(In the formula, R ^{10 to} R ¹³ are each a chain hydrocarbon.)
And tetraethers, triethers, diethers and monoethers of pentaerythritol and aliphatic monohydric alcohols.

Examples of the ether of the chain hydrocarbon triol and the aliphatic monohydric alcohol include the following formulas (14) to (16):

(In the formula, R ^{14 to} R ¹⁶ are each a chain hydrocarbon.)
And triethers, diethers and monoethers of glycerin and aliphatic monohydric alcohols.

Examples of ethers of the chain hydrocarbon diol and the aliphatic monohydric alcohol include the following formula (17):
R ¹⁷ OC _n H _2n OR ¹⁸ (17)
(Wherein n is an integer from 2 to 6 and R ¹⁷ and R ¹⁸ are each a chain hydrocarbon)
A diether of a C ₂ -C ₆ glycol and an aliphatic monohydric alcohol, and the following formula (18):
R ¹⁷ OC _n H _2n OH (18)
(Wherein n is an integer from 2 to 6 and R ¹⁷ is a chain hydrocarbon)
And a monoether of a C ₂ -C ₆ glycol and an aliphatic monohydric alcohol.

In the tetraether of pentaerythritol and aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the tetraether of pentaerythritol and aliphatic monohydric alcohol, that is, in the above formula (10), When the total number of carbon atoms in R ¹⁰ , R ¹¹ , R ¹² and R ¹³ is 4, IOB is 0.44. Therefore, in the tetraether of pentaerythritol and aliphatic monohydric alcohol, the IOB satisfies the requirement of about 0 to about 0.6 when the total number of carbon atoms of the aliphatic monohydric alcohol is about 4 or more.

In the triether of pentaerythritol and aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the triether of pentaerythritol and aliphatic monohydric alcohol, that is, in the above formula (11), When the total number of carbon atoms in R ¹⁰ , R ¹¹ and R ¹² is 9, IOB is 0.57. Therefore, in the triether of pentaerythritol and aliphatic monohydric alcohol, when the total number of carbon atoms of the aliphatic monohydric alcohol is about 9 or more, IOB satisfies the requirement of about 0 to about 0.6.

In the diether of pentaerythritol and aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the diether of pentaerythritol and aliphatic monohydric alcohol, that is, in the formula (12), R ¹⁰ When the total number of carbon atoms in the R ¹¹ portion is 15, the IOB is 0.60. Therefore, in the diether of pentaerythritol and aliphatic monohydric alcohol, the IOB satisfies the requirement of about 0 to about 0.6 when the total number of carbon atoms of the aliphatic monohydric alcohol is about 15 or more.

In the monoether of pentaerythritol and aliphatic monohydric alcohol, the carbon number of the aliphatic monohydric alcohol constituting the monoether of pentaerythritol and aliphatic monohydric alcohol, that is, in the above formula (13), R ¹⁰ When the number of carbon atoms in the portion is 22, the IOB is 0.59. Therefore, in the monoether of pentaerythritol and aliphatic monohydric alcohol, when the aliphatic monohydric alcohol has about 22 or more carbon atoms, the IOB satisfies the requirement of about 0 to about 0.6.

In the triether of glycerin and aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the triether of glycerin and aliphatic monohydric alcohol, that is, in the formula (14), R ^When the total number of carbon atoms in the ¹⁴ , R ¹⁵ and R ¹⁶ parts is 3, the IOB is 0.50. Therefore, in the above triether of glycerin and aliphatic monohydric alcohol, when the total number of carbon atoms of the aliphatic monohydric alcohol is about 3 or more, IOB satisfies the requirement of about 0 to about 0.6.

In the diether of glycerin and aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the diether of glycerin and aliphatic monohydric alcohol, that is, in the formula (15), R ¹⁴ and R ¹⁵ When the total number of carbon atoms in the portion is 9, the IOB is 0.58. Therefore, in the diether of glycerin and aliphatic monohydric alcohol, when the total number of carbon atoms of the aliphatic monohydric alcohol is about 9 or more, IOB satisfies the requirement of about 0 to about 0.6.

In the monoether of glycerin and aliphatic monohydric alcohol, the carbon number of the aliphatic monohydric alcohol constituting the monoether of glycerin and aliphatic monohydric alcohol, that is, the carbon of R ¹⁴ moiety in the formula (16). When the number is 16, the IOB is 0.58. Therefore, in the monoether of the glycerin and the aliphatic monohydric alcohol, when the aliphatic monohydric alcohol has about 16 or more carbon atoms, the IOB satisfies the requirement of about 0 to about 0.6.

In the diether of butylene glycol (n = 4) and aliphatic monohydric alcohol represented by the formula (17), when the total number of carbon atoms in the R ¹⁷ and R ¹⁸ parts is 2, the IOB is 0.33. . Therefore, in the diether of butylene glycol (n = 4) and the aliphatic monohydric alcohol represented by the formula (17), when the total number of carbon atoms of the aliphatic monohydric alcohol is 2 or more, the IOB is about 0 to about Meet the requirement of 0.6. Further, in the monoether of ethylene glycol (n = 2) and aliphatic monohydric alcohol represented by the formula (18), when the number of carbon atoms in the R ¹⁷ portion is 8, the IOB is 0.60. Therefore, in the monoether of ethylene glycol (n = 2) and aliphatic monohydric alcohol represented by formula (18), when the aliphatic monohydric alcohol has about 8 or more carbon atoms, the IOB is about 0 to 0. Meet the requirement of about 0.6.

  Compound (B) is produced by dehydration condensation of a compound having 2 to 4 hydroxyl groups and a compound having 1 hydroxyl group such as an aliphatic monohydric alcohol in the presence of an acid catalyst. can do.

[(C) an ester of a compound having 2 to 4 carboxyl groups and a compound having 1 hydroxyl group]
(C) An ester of a compound having 2 to 4 carboxyl groups and a compound having one hydroxyl group (hereinafter sometimes referred to as “compound (C)”) is 4, 3 or As long as an ester of a compound having two carboxyl groups and a compound having one hydroxyl group is included and has the above-mentioned IOB, melting point and water solubility, all the carboxyl groups are not esterified. Also good.

  Examples of the compound having 2 to 4 carboxyl groups include chain hydrocarbons having 2 to 4 carboxyl groups, such as chain hydrocarbon dicarboxylic acids such as alkanedicarboxylic acids such as ethanedioic acid. , Propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, octanedioic acid, nonanedioic acid and decanedioic acid, chain hydrocarbon tricarboxylic acids such as alkanetricarboxylic acid such as propane Acids, butanetriacids, pentanetriacids, hexanetriacids, heptanetriacids, octanetriacids, nonanetriacids and decanetriacids, and chain hydrocarbon tetracarboxylic acids such as alkanetetracarboxylic acids such as butanetetra Acid, pentanetetraacid, hexanetetraacid, heptanetetraacid, octanetetraacid, nonanetetraacid and decanetetraacid And the like.

The compound having 2 to 4 carboxyl groups has 2 to 4 carboxyl groups such as hydroxy acid having 2 to 4 carboxyl groups, such as malic acid, tartaric acid, citric acid, and isocitric acid. Alkoxy acids having, for example, O-acetylcitric acid, and oxo acids having 2 to 4 carboxyl groups.
Examples of the compound having one hydroxyl group include those listed in the section of “Compound (B)”, for example, aliphatic monohydric alcohols.

As the compound (C), (C ₁ ) an ester of a chain hydrocarbon tetracarboxylic acid having 4 carboxyl groups, a hydroxy acid, an alkoxy acid or an oxo acid and an aliphatic monohydric alcohol, such as a monoester, Diesters, triesters and tetraesters, preferably diesters, triesters and tetraesters, more preferably triesters and tetraesters, and even more preferably tetraesters, (C ₂ ) chain hydrocarbon tricarboxylic acids having three carboxyl groups Esters of acids, hydroxy acids, alkoxy acids or oxo acids with aliphatic monohydric alcohols, such as monoesters, diesters and triesters, preferably diesters and triesters, and more preferably triesters, and (C ₃ ) 2 pieces Chain hydrocarbon dicarboxylic acids having a carboxyl group, hydroxy acids, esters of alkoxy acids or oxoacids, and aliphatic monohydric alcohols, for example, mono- and diesters, and the like, preferably a diester.
Examples of the compound (C) include dioctyl adipate, diisostearyl malate, tributyl citrate, tributyl O-acetylcitrate and the like, and are commercially available.

[(D) The hydrocarbon is selected from the group consisting of an ether bond (—O—), a carbonyl bond (—CO—), an ester bond (—COO—), and a carbonate bond (—OCOO—). Compound with one inserted]
(D) The hydrocarbon has any one selected from the group consisting of an ether bond (—O—), a carbonyl bond (—CO—), an ester bond (—COO—), and a carbonate bond (—OCOO—). The inserted compound (hereinafter sometimes referred to as “compound (D)”) includes (D ₁ ) an ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, (D ₂ ) a dialkyl ketone, (D ₃ ) Esters of fatty acids and aliphatic monohydric alcohols, and (D ₄ ) dialkyl carbonates.

[(D ₁ ) Ether of aliphatic monohydric alcohol and aliphatic monohydric alcohol]
Examples of the ether of the aliphatic monohydric alcohol and the aliphatic monohydric alcohol include the following formula (19):
R ¹⁹ OR ²⁰ (19)
(In the formula, R ¹⁹ and R ²⁰ are each a chain hydrocarbon)
The compound which has is mentioned.

As the aliphatic monohydric alcohol constituting the ether (corresponding to R ¹⁹ OH and R ²⁰ OH in the formula (19)), the ether satisfies the requirements of the IOB, melting point and water solubility. There is no particular limitation, and examples thereof include aliphatic monohydric alcohols listed in the section of “Compound (B)”.

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

[(D ₂ ) dialkylketone]
As the dialkyl ketone, the following formula (20):
R ²¹ COR ²² (20)
(Wherein R ²¹ and R ²² are each an alkyl group)
The compound which has is mentioned.

In the dialkyl ketone, since the IOB is 0.54 when the total number of carbon atoms of R ²¹ and R ²² is 5, the above IOB requirement is satisfied if the total number of carbon atoms is about 5 or more. However, when the total number of carbon atoms is about 5, the water solubility is as high as about 2 g. Therefore, in order to satisfy the requirement that the water solubility is about 0.05 g or less, the total number of carbon atoms is preferably about 8 or more. In consideration of the vapor pressure, the carbon number is preferably about 10 or more, and more preferably about 12 or more.
When the total number of carbon atoms is about 8, for example, 5-nonanone has a melting point of about −50 ° C. and a vapor pressure of about 230 Pa at 20 ° C.
In addition to being commercially available, the dialkyl ketone can be obtained by a known method, for example, by oxidizing a secondary alcohol with chromic acid or the like.

[(D ₃ ) ester of fatty acid and aliphatic monohydric alcohol]
Examples of the ester of the fatty acid and the aliphatic monohydric alcohol include the following formula (21):
R ²³ COOR ²⁴ (21)
(Wherein R ²³ and R ²⁴ are each a chain hydrocarbon)
The compound which has is mentioned.

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

In the ester of the fatty acid and the aliphatic monohydric alcohol, the total number of carbon atoms of the fatty acid and the aliphatic monohydric alcohol, that is, the total number of carbon atoms in the R ²³ C and R ²⁴ portions in the formula (21) is 5 In this case, the IOB is 0.60. Therefore, in the ester of the fatty acid and the aliphatic monohydric alcohol, when the total number of carbon atoms in the R ²³ C and R ²⁴ parts is about 5 or more, the IOB requirements Meet. However, for example, butyl acetate having a total of 6 carbon atoms has a high vapor pressure of over 2000 Pa. Therefore, considering the vapor pressure, the total number of carbon atoms is preferably about 12 or more. In addition, if the total number of carbon atoms is about 11 or more, the water solubility can satisfy the requirement of about 0.05 g or less.

Examples of the ester of the fatty acid and the aliphatic monohydric alcohol include, for example, an ester of dodecanoic acid (C ₁₂ ) and dodecyl alcohol (C ₁₂ ), tetradecanoic acid (C ₁₄ ), and dodecyl alcohol (C ₁₂ ). Examples of commercially available esters of fatty acids and aliphatic monohydric alcohols include Electol WE20 and Electol WE40 (manufactured by NOF Corporation).

[(D ₄ ) dialkyl carbonate]
As the dialkyl carbonate, the following formula (22):
R ²⁵ OC (= O) OR ²⁶ (22)
(Wherein R ²⁵ and R ²⁶ are each an alkyl group)
The compound which has is mentioned.

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

[(E) poly C _{2 ~ 6} alkylene glycol or an ester or ether,]
The poly C _{2 ~ 6} alkylene glycol or an ester or ether, (hereinafter sometimes referred to as compound (E)) The (E ₁₎ poly C _{2 ~ 6} alkylene glycol, (E ₂₎ poly C _{2 ~ 6} esters of alkylene glycols with fatty acids, (E ₃₎ poly C _{2 ~ 6} alkylene glycol and an aliphatic monohydric ether alcohols, (E ₄₎ poly C _{2 ~ 6} alkylene glycol and a chain hydrocarbon tetracarboxylic acid , esters of chain hydrocarbon tricarboxylic acid or chain hydrocarbon dicarboxylic acid, and (E _5), and poly C _{2 ~ 6} alkylene glycol and a chain hydrocarbon tetraol, chain hydrocarbon triol or chain hydrocarbon, And ether with hydrogen diol. This will be described below.

[(E ₁₎ poly C _{2 ~ 6} alkylene glycol]
(E ₁₎ to the poly C _{2 ~ 6} alkylene glycol, as well as homopolymers of a single glycol, 2 or more glycols copolymers and random polymers are also included. The glycol species, C 2 _{~ 6} alkylene glycol, i.e., ethylene glycol, propylene glycol, butylene glycol, pentylene glycol or hexylene glycol. As the glycol species, from the viewpoint of lowering the IOB poly C _{2 ~ 6} alkylene glycol, propylene glycol, butylene glycol, preferably a pentylene glycol or hexylene glycol, butylene glycol, pentylene glycol or hexylene glycol It is more preferable that

In this specification, "poly C _{2 ~ 6} alkylene glycol", C 2 _{~ 6} alkylene glycol, i.e., ethylene glycol, propylene glycol, butylene glycol, is selected from the group consisting of pentylene glycol and hexylene glycol It means any one kind of homopolymer, two or more kinds of copolymers selected from the above group, or two or more kinds of random polymers selected from the above group.

When the poly C _{2 ~ 6} alkylene glycol is a homopolymer, poly C _{2 ~ 6} alkylene glycol, the following equation (23):
_{HO- (C m H 2m O)} n -H (23)
Is represented by

The present inventors have confirmed that polyethylene glycol (corresponding to m = 2 in formula (23)) is about 0 to about when n ≧ 45 (approximately over 2,000 molecular weight). Although the IOB requirement of 0.60 was met, the water solubility requirement was not met even when the molecular weight exceeded 4,000. Therefore, (E ₁₎ to the poly-C _{2 ~ 6} alkylene glycols, homopolymers of ethylene glycol is considered to not contain ethylene glycol as a copolymer or random polymer with another glycol, (E ₁₎ poly C It should be included in the _{2 to 6} alkylene glycol.

Thus, the homopolymer of formula (23) may include a homopolymer of propylene glycol, butylene glycol, pentylene glycol or hexylene glycol.
From the above, in formula (23), m is about 3 to about 6, more preferably about 4 to about 6, and n is 1 or more.

In the above formula (23), the value of n, poly C _{2 ~ 6} alkylene glycol, and from about 0 to about 0.60 IOB, and a melting point below about 45 ° C., in water 100g of 25 ° C., about 0. It is such a value that it has a water solubility of not more than 05 g.
For example, when Formula (23) is polypropylene glycol (m = 3), when n = 12, the IOB is 0.58. Therefore, when Formula (23) is polypropylene glycol (m = 3), the above IOB requirement is satisfied when m ≧ about 12.
When the formula (21) is polybutylene glycol (m = 4), the IOB is 0.57 when n = 7. Therefore, when the formula (23) is polybutylene glycol (m = 4), the above IOB requirement is satisfied when n ≧ about 7.

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

Examples of commercial products of the poly C _{2 ~ 6} alkylene glycol, e.g., UNIOL (TM) D-1000, D-1200 , D-2000, D-3000, D-4000, PB-500, PB-700, PB- 1000 and PB-2000 (above, manufactured by NOF Corporation).

[(E ₂₎ an ester of a poly C _{2 ~ 6} alkylene glycol and fatty acid]
The ester of a poly-C _{2 ~ 6} alkylene glycol and a fatty acid, one or both of the OH-terminated poly C _{2 ~ 6} alkylene glycol described in the section "(E ₁₎ poly C _{2 ~ 6} alkylene glycol" is Those that are esterified with fatty acids, that is, monoesters and diesters are mentioned.

In esters of poly C _{2 ~ 6} alkylene glycol and fatty acid, the fatty acid to be esterified, for example, fatty acids listed in the "(A ₁₎ chain hydrocarbon tetraols and esters of fatty acids", i.e., saturated Fatty acids or unsaturated fatty acids can be mentioned, and saturated fatty acids are preferred in consideration of the possibility of modification by oxidation or the like.
Examples of commercial products of esters of the poly C _{3 ~ 6} alkylene glycols with fatty acids, for example, Will Bright cp9 (NOF Corporation) and the like.

[(E ₃₎ poly C _{2 ~ 6} alkylene glycol and ethers and aliphatic monohydric alcohol]
The ethers of the poly C _{2 ~ 6} alkylene glycol and an aliphatic monohydric alcohol, one OH-terminated poly C _{2 ~ 6} alkylene glycol described in the section "(E ₁₎ poly C _{2 ~ 6} alkylene glycol" Or both are etherified with aliphatic monohydric alcohols, ie monoethers and diethers.
In an ether of a poly C _{2 ~ 6} alkylene glycol and an aliphatic monohydric alcohol, the aliphatic monohydric alcohol to be etherified, for example, aliphatic monohydric alcohols listed for "compound (B)" Can be mentioned.

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

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

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

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

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

And the poly C _{2 ~ 6} alkylene glycol and a chain hydrocarbon tetraol, chain hydrocarbon triol or an ether of a chain hydrocarbon diol also chain hydrocarbon tetraol, chain hydrocarbon triol or chain, to Jo hydrocarbon diols, C 2 _{~ 6} alkylene glycol, can be prepared by polycondensation under known conditions.

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

  The blood modifying agent will be discussed in detail together with the examples, and is considered to have a mechanism for lowering the viscosity and surface tension of blood. Compared with normal blood, menstrual blood to be absorbed by the absorbent article contains proteins such as the endometrial wall. Cheap. Therefore, menstrual blood to be absorbed by the absorbent article tends to be highly viscous, and when the top sheet is a non-woven fabric, menstrual blood is likely to clog between the fibers, and the wearer is likely to feel a stickiness, and Menstrual blood diffuses on the surface of the top sheet, making it easier to leak.

In the absorbent article of the present disclosure, the top sheet contains a blood modifying agent that is considered to have a mechanism for lowering the viscosity and surface tension of blood. Blood can be quickly transferred from the top sheet to the absorber.
Further, in the absorbent article of the present disclosure, the blood modifying agent has a melting point of about 45 ° C. or less, so that it is about 30 to about 30 ° C. regardless of whether it is liquid or solid at room temperature (25 ° C.). It is considered that when it comes into contact with a body fluid at 40 ° C., it liquefies (or is a liquid) and is easily dissolved in the body fluid.

Furthermore, a blood modifying agent having an IOB of about 0 to about 0.60 is highly organic and easily enters between blood cells, which stabilizes the blood cells and makes it difficult to form a monetary structure on the blood cells. It is considered possible.
It is considered that the above-mentioned modifying agent stabilizes blood cells and makes it difficult to form a monetary structure on the blood cells, so that the absorbent body can easily absorb menstrual blood. For example, it is known that, in an absorbent article containing an acrylic superabsorbent polymer, so-called SAP, when menstrual blood is absorbed, the blood cells that have been collected cover the surface of the SAP, making it difficult for the SAP to exhibit absorption performance. It is considered that SAP stabilizes blood cells and can easily exhibit absorption performance. In addition, it is considered that the blood modifying agent having a high affinity for red blood cells protects the red blood cell membrane, so that the red blood cells are hardly destroyed.

In the absorbent article, the topsheet preferably contains about 1 to about 30 g / m ² , more preferably about 2 to about 20 g / m ² , and even more preferably about 3 to about 10 g / m ^{2 of} the blood modifying agent. Inclusive of m ² basis weight range. When the basis weight of the blood modifying agent is less than about 1 g / m ² , the blood modifying effect tends to be insufficient, and when the basis weight of the blood modifying agent is increased, the sticky feeling during wearing increases. Tend.

  The method for applying the blood modifying agent is not particularly limited, and is heated as necessary. For example, a non-contact type coater such as a spiral coater, a curtain coater, a spray coater, a dip coater, or the like. It can be applied by a coater or the like. A non-contact type coater is preferable from the viewpoint that the modifier in the form of droplets or particles is uniformly dispersed throughout and from the viewpoint of not damaging the material. The blood modifying agent is applied from the control seam HMA gun as it is when it is liquid at room temperature or heated to lower the viscosity and heated so as to be liquefied when it is solid at room temperature. be able to. By increasing the air pressure of the control seam HMA gun, the particulate blood modifying agent can be applied.

  The blood modifying agent can be applied at the time of producing the top sheet, or can be applied at a production line for producing an absorbent article. From the viewpoint of suppressing capital investment, it is preferable to apply a blood modifying agent in the production line for absorbent articles, and in order to prevent the blood modifying agent from dropping and contaminating the line, the production line It is preferable to apply the blood modifying agent immediately before the downstream process, specifically, immediately before the product is enclosed in the individual package.

  The top sheet is preferably subjected to a hydrophilic treatment by coating or mixing with a hydrophilic agent. If the original material is hydrophilic, then it has an IOB of about 0 to about 0.60 and is coated with a highly organic and lipophilic modifier, so that the lipophilic region, the hydrophilic region, Will coexist sparsely. Thereby, it is considered that a certain absorption performance can be exhibited for menstrual blood composed of a hydrophilic component (plasma and the like) and a lipophilic component (blood cell and the like).

  The blood modifying agent preferably has a weight average molecular weight of about 2,000 or less, and more preferably has a weight average molecular weight of 1,000 or less. This is because when the weight average molecular weight increases, it becomes difficult to lower the viscosity of the blood modifying agent to a viscosity suitable for coating, and there is a case where the blood modifying agent should be diluted with a solvent. Further, when the number average molecular weight is increased, the blood modifying agent is tacky, which may cause discomfort to the wearer.

  The back sheet 3 shown in FIGS. 1 and 2 prevents body fluid absorbed by the absorbent body 4 from leaking out. A material that does not transmit body fluid is used for the backsheet 3. For example, a hydrophobic nonwoven fabric, a water-impermeable plastic film such as polyethylene and polypropylene, or a laminate sheet of a nonwoven fabric and a water-impermeable plastic film is used as the back sheet 3. Further, an SMS nonwoven fabric in which a melt-blown nonwoven fabric having high water resistance is sandwiched between strong spunbond nonwoven fabrics may be used as the back sheet 3. The use of a breathable material that does not allow body fluid to pass through can be used to reduce stuffiness when worn.

  The absorber 4 absorbs and holds the body fluid. It is preferable that the absorber 4 is bulky, does not easily lose its shape, and has little chemical stimulation. For example, as the absorbent body 4, a composite absorbent body made of fluffy pulp or air laid nonwoven fabric and a super absorbent polymer (SAP) is used. This composite absorbent body may be covered with a liquid-permeable material such as a tissue.

Moreover, you may use artificial cellulose fibers, such as a chemical pulp, a cellulose fiber, rayon, and an acetate, for example instead of the fluffy pulp of the said composite absorber. The basis weight of absorbent fibers such as pulp in the composite absorbent is preferably 100 g / m ² or more and 800 g / m ² or less, and the mass ratio of the superabsorbent polymer in the composite absorbent is absorbent. The fiber content is preferably 10% or more and 65% or less with 100%. The basis weight of the liquid-permeable material such as a tissue covering the composite mixture is preferably 12 g / m ² or more and 30 g / m ² or less.

  As the airlaid nonwoven fabric of the composite mixture, for example, a nonwoven fabric obtained by thermally fusing pulp and synthetic fiber or a nonwoven fabric obtained by fixing pulp and synthetic fiber with a binder can be used.

  The superabsorbent polymer of the composite absorbent has a three-dimensional network structure in which water-soluble polymers are appropriately crosslinked. This absorbent polymer absorbs 30 to 60 times as much water as the volume of the absorbent polymer before absorbing water. However, this absorbent polymer is essentially water insoluble. Moreover, even if this absorptive polymer is applied some pressure, it does not water the water once absorbed. As the absorbent polymer, for example, a starch-based, acrylic acid-based or amino acid-based particulate or fibrous polymer is used.

  Although the shape and structure of the absorbent body can be changed as necessary, the total amount of absorption of the absorbent body 4 needs to correspond to the designed insertion amount and the desired application as the absorbent article 1. Further, the size and absorption capacity of the absorbent body 4 are changed according to the application.

  The wing part 5 is provided in the absorbent article 1 in order to stably fix the absorbent article 1 to the underwear. The absorbent article 1 can be stably fixed to the undergarment by bending the wing part 5 to the outer surface side of the undergarment and then sticking it to the crotch part of the undergarment via the adhesive part 6.

  The adhesive part 6 fixes the absorbent article 1 to the crotch part of the underwear. As the pressure-sensitive adhesive that forms the pressure-sensitive adhesive portion 6, for example, a styrene-based polymer, a tackifier, or a plasticizer that is a main component is preferably used. Examples of the styrenic polymer include styrene-ethylene-butylene-styrene block copolymers, styrene-butylene polymers, styrene-butylene-styrene block copolymers, and styrene-isobutylene-styrene copolymers. Only one of them may be used, or two or more polymer blends may be used. Among these, a styrene-ethylene-butylene-styrene block copolymer is preferable in terms of good thermal stability.

  As the tackifier and plasticizer, those that are solid at room temperature can be preferably used. Examples of the tackifier include C5 petroleum resins, C9 petroleum resins, dicyclopentadiene petroleum resins, and rosin petroleum resins. Polyterpene resin, terpene phenol resin, etc., and examples of the plasticizer include monomer plasticizers such as trifresil phosphate, dibutyl phthalate, dioctyl phthalate, and polymer plasticizers such as vinyl polymers and polyesters. It is done.

  By joining the top sheet 2 to the back sheet 3 by heat embossing, seal portions 7 are formed on both sides in the longitudinal direction of the absorbent article 1.

  Next, with reference to FIG. 4, the manufacturing method of 2 A of top sheets of the absorbent article 1 in the 1st Embodiment of this invention is demonstrated. FIG. 4 is a diagram for explaining a top sheet manufacturing apparatus 100A used in the method for manufacturing the top sheet 2A in the first embodiment of the present invention. The top sheet manufacturing apparatus 100 </ b> A includes a concave forming roll 120 </ b> A, a stretched gear roll 130, and a lubricant application spray 140. Moreover, the manufacturing method of 2 A of top sheets includes the process of preparing a resin film, a recessed part formation process, a gear extending process, and a lubricant application | coating process.

  In the step of preparing the resin film, the resin film 102A supplied from a roll of resin film (not shown) is supplied to the recess forming roll 120A.

  In the recess forming step, the heated resin film 102A (see FIG. 8A) is passed through the recess forming roll 120A to produce the resin film 103A in which the recess 104A is formed (see FIG. 8B). The recess forming roll 120A includes a knurled roll 121A and a preheating roll 122A having a smooth surface.

  FIGS. 5A and 5B are diagrams illustrating an example of a knurled roll 121A. FIG. 5A is a diagram showing the entire knurled roll 121A, and FIG. 5B is a diagram showing a resin when the resin film 102A passes between the knurled roll 121A and a roll 122A having a smooth surface. It is the figure which expanded the part 123A of the surface of the knurled roll 121A which touches the film 102A. FIG.5 (c) is a figure which shows an example of the preheating roll 122A which has a smooth surface. A grid-like convex portion 124A is provided on the surface 123A of the knurled roll 121A. As a result, a diamond-shaped recess 125A is formed on the surface of the knurled roll 121A.

  The interval between the center lines of the protrusions 124A arranged in parallel in the lattice-like protrusions 124A, that is, the pitch of the lattice-like protrusions 124A is preferably 0.2 mm or more and 10 mm or less, more preferably 0.4 mm or more, 2 mm or less. When the pitch of the grid-like convex portions 124A is less than 0.2 mm or larger than 10 mm, the concave portions may not be formed in the resin film. Further, the width of the grid-like convex portion 124A is preferably 0.01 mm or more and 1 mm or less, more preferably 0.03 mm or more and 0.1 mm or less. Further, the length of one side of the rhombic recess 125A is preferably 0.1 mm or more and 5 mm or less, and more preferably 0.2 mm or more and 1 mm or less. When the width of the grid-like convex portion 124A is less than 0.01 mm or larger than 1 mm, or when the length of one side of the rhombic concave portion 125A is less than 0.1 mm or larger than 5 mm, the concave portion may not be formed in the resin film. .

  The preheating roll 122A having a smooth surface is maintained at a temperature of 70 ° C. or higher and 100 ° C. or lower, and heats the supplied resin film 102A. Thereby, the resin film 102A becomes soft and easy to mold.

  When the resin film 102A passes between the knurled roll 121A and the roll 122A having a smooth surface, the resin film 102A receives pressure in the thickness direction at a portion in contact with the grid-like convex portion 124A, and FIG. A substantially rectangular recess 104A shown in b) is formed in the resin film 102A. The shape of the concave portion 125A of the knurled roll 121A is not limited to a rhombus, and may be a square, a rectangle, a parallelogram, a trapezoid, a triangle, a hexagon, or the like.

  In the gear stretching step, a resin film 105A having protrusions 21A and openings 25A is produced by passing the resin film 103A having recesses through the stretching gear roll 130 shown in FIG. 4 (FIG. 8C). reference). FIG. 6A is a view showing the upper gear roll 131 of the extension gear roll 130. FIG. 6B is a view for explaining the gear teeth 133 arranged on the outer peripheral surface of the upper gear roll 131. The gear teeth 133 extend in the circumferential direction of the upper gear roll 131. In order to prevent the resin film 103A from being cut by the corners of the gear teeth 133 when the resin film 103A (see FIG. 8B) passes through the stretched gear roll 130, the corners of the gear teeth 133 are chamfered in an R shape. ing.

  The width of the gear teeth 133 is, for example, 0.3 to 0.5 mm, and the distance between adjacent gear teeth 133 is, for example, 1.0 to 1.2 mm. Since the lower gear roll 132 of the gear roll 130 has the same shape as the upper gear roll 131, detailed description of the lower gear roll 132 is omitted. The length in the radial direction of the upper gear roll 131 at the portion where the gear teeth 133 of the upper gear roll 131 and the gear teeth of the lower gear roll 132 mesh, that is, the biting depth is, for example, 1.25 mm. The clearance between the gear teeth 133 of the upper gear roll 131 and the gear teeth of the lower gear roll 132 when the gear teeth 133 of the upper gear roll 131 and the gear teeth of the lower gear roll 132 are engaged with each other is, for example, 0.25-0. 45 mm.

  When the resin film 103A passes through the stretched gear roll 130, the resin film 103A is bent into a substantially wave shape, and a resin film 105A in which the protruding portion 21A is formed is produced (see FIG. 8C).

  Next, with reference to FIG. 7, the principle that the opening 25A is formed in the resin film 103A when the resin film 103A is passed through the stretched gear roll 130 will be described. Note that this principle does not limit the present invention.

  The resin film 103 </ b> A is greatly stretched at a portion 106 </ b> A where the gear teeth 133 of the upper gear roll 131 and the gear teeth 134 of the lower gear roll 132 are engaged with each other. Since the portion where the recess 104A is formed in the step of forming the recess described above is a portion where the basis weight of the resin film 103A is abruptly changed, the strength is weak, and the recess 104A of the resin film 103A is subjected to stretching. Torn. Therefore, in the portion 106A that has been stretched by the resin film 103A, the concave portion 104A of the resin film 103A is torn, and the torn portion of the resin film 103A is spread to form an opening 25A.

  The resin film 103A is not stretched so much at the portion 107A where the gear teeth 133 of the upper gear roll 131 and the gear teeth 134 of the lower gear roll 132 are not engaged with each other. Therefore, in the portion 107A where the gear teeth 133 of the upper gear roll 131 and the gear teeth 134 of the lower gear roll 132 in the resin film 103A do not mesh with each other, even if the resin film 103A passes through the stretched gear roll 130, The formed recess 104A is not torn and does not become an opening. Then, the recess 104A formed in the step of forming the recess is slightly stretched to become the recess 26A of the topsheet 2.

  The portion 107A where the gear teeth 133 of the upper gear roll 131 of the resin film 103A and the gear teeth 134 of the lower gear roll 132 are not meshed with each other corresponds to the top portion 23A and the bottom portion 22A of the protruding portion 21 of the top sheet 2A (see FIG. 3). . A portion 106A where the gear teeth 133 of the upper gear roll 131 of the resin film 103A and the gear teeth 134 of the lower gear roll 132 mesh with each other corresponds to the wall portion 24A of the ridge portion 21A of the top sheet 2A (see FIG. 3). Therefore, a recess 26A is provided in the top 23A and the bottom 22A of the ridge 21A of the top sheet 2A, and an opening 25A is provided in the wall 24A of the ridge 21A of the top sheet 2A.

  Since the resin film used for the top sheet 2A becomes thin when stretched, the concealability becomes weak. Therefore, when the absorbent article 1 is viewed from the upper side of the skin, the body fluid absorbed by the absorbent body 4 is hidden behind the bottom portion 22A of the top sheet 2A and the top portion 23A of the ridge portion 21A, but the absorbent article 1 is obliquely viewed. When viewed from the direction, the bodily fluid absorbed by the absorbent body 2 can be seen through the wall portion 24A of the ridge portion 21A of the top sheet 2A and through the opening portion 25A of the wall portion 24A. Therefore, when it is desired to determine the time of replacement of the absorbent article 1, the amount of body fluid absorbed by the absorbent body 4 can be confirmed by viewing the absorbent article 1 from an oblique direction. It is possible to determine the time of replacement.

In the lubricant application step, the above-described lubricant 141 is applied to the resin film 105A that has been gear-stretched using the lubricant application spray 140 to produce the resin film 108A having the lubricant layer 27A formed on the surface (FIG. 8D). reference). The coating amount of the lubricant, 0.1 g / m ² or more, preferably 30.0 g / m ² or less, 1.0 g / m ² or more, more preferably 10.0 g / m ² or less. When the coating amount of the lubricant is less than 0.1 g / m ² , the effect of wiping off the body fluid by the lubricant may not occur. When the application amount of the lubricant is larger than 30.0 g / m ^2, a feeling that the surface of the top sheet 2A is wet may be given to the wearer.

  The lubricant may be applied to the entire surface of the resin film 105A, or the lubricant may be applied to the resin film 105A only in the region corresponding to the region where the body fluid of the wearer in the absorbent article is discharged. In the step of applying the lubricant, the lubricant 141 is applied to the resin film 105A by spraying using the lubricant application spray 140. However, the lubricant 141 may be applied to the resin film 105A by a printing method, a dipping method, or the like.

Examples of top sheet manufacturing conditions are shown below.
Resin film material: Low density polyethylene (LDPE)
Basis weight of resin film: 23.5 g / m ² or 35.0 g / m ²
Resin film thickness: 20 μm or 30 μm
Content of titanium oxide in resin film: 2.9% or 5%
Preheating roll temperature: 80 ° C
Pitch of grid-like convex part of knurled roll: 0.4mm
Gear tooth width: 0.5mm
Distance between adjacent gear teeth: 1.0 mm
Gap between the gear teeth of the upper gear roll and the gear teeth of the lower gear roll: 0.25 mm
Biting depth of stretched gear roll: 1.25 mm

  FIG. 9A shows a grid-like convex portion 124A and a diamond-shaped concave portion 125A provided on the surface of the knurled roll.

  FIG. 9B shows a recess 104A formed in the resin film through the recess forming roll 120A. The length in the width direction (CD) of the recess 104A was 0.25 mm. The pitch in the width direction (CD) of the recesses 104A was 0.70 mm. Here, the pitch in the width direction of the recess 104A is a distance between the right ends in the width direction of the recess 104A adjacent in the horizontal direction in FIG.

  FIG. 9C shows the opening 25A formed on the wall 24A of the ridge and the recess 26 formed on the top 23A of the ridge through the extending gear roll 130A. Note that FIG. 9C was taken by extending a resin film bent in a substantially wave shape in order to focus the microscope on the entire resin film.

-Second Embodiment-
A second embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited to what is described in the drawings. In addition, the same code | symbol is attached | subjected to the part which is common in the 1st Embodiment of this invention, and a different part from the 1st Embodiment of this invention is mainly demonstrated.

  Since the configuration of the absorbent article of the second embodiment of the present invention is the same as that of the absorbent article 1 of the first embodiment except for the top sheet, the top sheet of the absorbent article of the second embodiment is mainly used. Explained.

  FIG. 10 is a schematic perspective view of the top sheet 2B of the absorbent article according to the second embodiment. The top sheet 2B that is bent so that the cross section in the width direction has a substantially wave shape has a protruding portion 21B extending in the longitudinal direction and a bottom portion 22B disposed between the adjacent protruding portions 21B. In addition, the direction where the protrusion 21B extends is not limited to the longitudinal direction. The ridge portion 21B has a top portion 23B which is a surface in contact with the wearer's skin and a side wall portion 24B. Since the top sheet 2B of the absorbent article of the second embodiment is also bent so that the cross-section is substantially wavy, when the wearer wipes body fluid such as menstrual blood with toilet paper or the like, it is applied to the surface of the top sheet 2B. Due to the applied pressure, the substantially wavy shape of the top sheet 2B is deformed to flatten the top sheet 2B, and body fluid attached to the surface of the top sheet 2B can be easily wiped off.

  The top sheet 2B has a resin film layer 31B provided with a large number of openings 34B for allowing body fluid to pass through, a lubricant layer 33B provided on the skin side of the resin film layer 31B, and a clothing side of the resin film layer 31B. And a provided fiber assembly layer 32B. The fiber aggregate layer 32B is broken in the base material at the wall portion 24B of the protruding portion 21B. Here, the base material breakage B is destruction of the fiber assembly layer 32B that occurs inside the fiber assembly layer, such as the fiber assembly layer 32B tearing.

  Since the resin used as the resin film layer 31B is the same as the top sheet of the absorbent article according to the first embodiment, description of the resin used as the resin film layer 31B is omitted.

The basis weight of the resin film layer 31B is preferably 1 g / m ² or more and 30 g / m ² or less, more preferably 3 g / m ² or more and 15 g / m ² or less. The thickness of the resin film layer 31B is preferably 0.01 mm or more and 0.3 mm or less, more preferably 0.03 mm or more and 0.15 mm or less. When the thickness of the resin film layer 31B is less than 0.01 mm, the hiding property described later of the top sheet 2B may be too small, and when the thickness of the resin film layer 31B exceeds 0.3 mm. May increase the rigidity of the topsheet 2B, and the stimulation of the topsheet 2B to the wearer's skin may become too strong. Moreover, when the thickness of the resin film layer 31B exceeds 0.3 mm, the strength of the resin film layer 31B becomes too high, and the opening 34B may not be formed in the resin film layer 31B.

  Similar to the top sheet 2 of the absorbent article according to the first embodiment, the top sheet 2B has a concealing property so that the body fluid absorbed by the absorbent body is not visible from the outside. The concealing property of the top sheet 2 is caused by the concealing property of the resin film layer 31. The concealability of the resin film layer 31 is caused by mixing an inorganic filler such as titanium oxide with the resin. When the filler is titanium oxide, the content of titanium oxide is preferably 1% or more and 50% or less, more preferably 3% or more and 15% or less, based on the weight of the resin. When the content of titanium oxide is less than 1% with respect to the weight of the resin, the effect of concealing the body fluid absorbed by the absorbent body in the top sheet 2B may be too small. When the content of titanium oxide exceeds 50% with respect to the weight of the resin film, it may be difficult to form a resin containing titanium oxide into a layer.

In the wall portion 24B of the top sheet 2B, the resin film layer 31B has a plurality of openings 34B arranged in the extending direction (longitudinal direction) of the protrusion 21B. The opening 34B is a hole penetrating the resin film layer 31B, and the body fluid of the wearer is absorbed by the fiber assembly layer 32B through the opening 34B and absorbed by the absorbent body. Area of the opening 34B is preferably 0.0005 mm ² or more and 1.5 mm ² or less, more preferably 0.01 mm ² or more and 0.5 mm ² or less. When the opening area of the opening 34B is smaller than 0.0005 mm ² , the wearer's body fluid may not pass through the opening 34B. When the opening area of the opening 34B is larger than 1.5 mm ² , the absorbent body Once the body fluid is absorbed, the body fluid goes back through the opening 34B of the resin film layer 31B, or the ratio of the area of the resin film layer 31B other than the opening 34B is reduced, so that the concealability of the top sheet 2B is reduced. Sometimes. Further, if the opening area of the opening 34B of the resin film layer 31B is larger than 1.5 mm ² , the strength of the top sheet 2B may be too small.

  The ratio of the total opening area to the area of the resin film layer 31B, that is, the opening ratio of the resin film layer 31B is preferably 1% or more and 10% or less. When the opening ratio of the resin film layer 31B is smaller than 1%, the permeability of the body fluid in the top sheet 2B may be deteriorated. When the opening ratio of the resin film layer 31B is larger than 10%, the absorber is once absorbed. When the body fluid is returned through the opening 34B of the resin film layer 31B, or the ratio of the area other than the opening 34B of the resin film layer 31B is reduced, and the concealing property of the top sheet 2B is reduced. There is. Moreover, if the opening ratio of the resin film layer 31B is larger than 10%, the strength of the top sheet 2B may be too small.

The fiber assembly layer 32B includes paper, nonwoven fabric, and the like that are aggregates of hydrophilic fibers. The nonwoven fabric used as the fiber assembly layer 32B is preferably a tissue. Here, the tissue refers to a thin paper having a basis weight of 10 g / m ² or more and 20 g / m ² or less having wet strength with kraft pulp or rayon as a main component. The thickness of the fiber assembly layer 32B is preferably 0.1 mm or more and 0.5 mm or less. Even if the resin film layer 31B does not have hydrophilicity, the fiber assembly layer 32 can impart hydrophilicity to the top sheet 2B. Further, the fiber assembly layer 32B can impart flexibility to the top sheet 2B. When a tissue is used for the fiber assembly layer 32B, the tissue is cheaper than other papers and non-woven fabrics, and is easy to procure because it is widely available in the market. Moreover, although the intensity | strength of a tissue is low, a tissue can be used as the fiber assembly layer 32B of the top sheet 2B by using it with the resin film layer 31B. Furthermore, since the tissue is easily destroyed by the base material, the opening 34 can be easily formed in the resin film layer 31B by a gear stretching process described later.

  Since the lubricant layer 33B is the same as the lubricant layer 27A formed on the surface of the top sheet 2A of the absorbent article of the first embodiment, the description of the lubricant layer 33B is omitted.

  Next, with reference to FIG. 11, the manufacturing method of the top sheet in the 2nd Embodiment of this invention is demonstrated. FIG. 11 is a view for explaining a top sheet manufacturing apparatus 100B used in the method for manufacturing the top sheet 2B in the second embodiment of the present invention. The top sheet manufacturing apparatus 100 </ b> B includes a stretched gear roll 130 and a lubricant application spray 140. Moreover, the manufacturing method of the top sheet 2B includes a step of preparing a composite sheet composed of a resin film layer and a fiber assembly layer, a gear stretching step, and a lubricant application step.

  In the step of preparing a composite sheet composed of a resin film layer and a fiber assembly layer, the composite sheet 103B supplied from a roll of composite sheet (not shown) is supplied to the stretched gear roll 130. The composite sheet 103B is manufactured by extruding and laminating a resin on a fiber sheet such as a tissue sheet (a sheet of tissue) to form a resin film layer on the fiber sheet.

  In the gear stretching step, the composite sheet 103 is passed through the stretched gear roll 130, thereby forming a protrusion on the composite sheet 103 and forming an opening in the resin film layer of the composite sheet. Since the extending | stretching gear roll used at a gear extending | stretching process is the same as the gear extending | stretching roll 130 used with the manufacturing method of the top sheet of the absorbent article of 1st Embodiment, description of a gear extending | stretching roll is abbreviate | omitted.

  When the composite sheet 103B passes through the stretched gear roll 130, the composite sheet 103B is bent in a substantially wave shape, extends in the machine direction, and a plurality of protrusions arranged in the width direction are formed on the composite sheet 103B.

  Next, with reference to FIG. 12, the principle that an opening is formed in the resin film layer of the composite sheet 103B when the composite sheet 103B is passed through the stretched gear roll 130 will be described. Note that this principle does not limit the present invention.

  The composite sheet 103B is stretched at a portion 105B where the gear teeth 133 of the upper gear roll 131 and the gear teeth 134 of the lower gear roll 132 are engaged with each other.

  The fiber assembly layer is easily destroyed by the base material, and the tensile strength of the fiber assembly layer is lower than the tensile strength of the resin film layer. When the composite sheet 103B is stretched until the fiber aggregate layer is broken, the resin film layer integrated with the broken portion of the tissue layer is also broken together, and an opening is formed in the resin film layer. .

  Specifically, the surface of the fiber assembly layer has low smoothness, and small irregularities are formed on the surface of the fiber assembly layer. For this reason, a part with strong adhesive force between fiber aggregate layers and a weak part arise in a resin film layer. The resin film layer of the portion having a strong adhesive force with the fiber assembly layer is integrated with the fiber assembly layer when the composite sheet 103B is stretched until the fiber assembly layer breaks the base material. It breaks together with the substrate destruction of the aggregate layer to form an opening. However, the resin film layer of the portion having weak adhesive strength with the fiber assembly layer is released from the adhesion with the fiber assembly layer when the composite sheet 103B is stretched until the fiber assembly layer breaks the base material. Being separated from the layer. As a result, the portion of the resin film layer having a weak adhesive strength with the fiber assembly layer is not broken together with the substrate destruction of the fiber assembly layer. For this reason, an opening part is not formed in the resin film layer of a part with weak adhesive force with a fiber assembly layer. Since irregularities are irregularly formed on the surface of the fiber assembly layer, irregularly sized openings are formed in the resin film layer.

  The composite sheet 103B is not stretched so much at the portion 106B where the gear teeth 133 of the upper gear roll 131 and the gear teeth 134 of the lower gear roll 132 are not engaged with each other. For this reason, even if the composite sheet 103B passes through the stretched gear roll 130 in the portion 106B where the gear teeth 133 of the upper gear roll 131 and the gear teeth 134 of the lower gear roll 132 are not engaged with each other in the composite sheet 103B, no opening is formed.

  The portion 106B where the gear teeth 133 of the upper gear roll 131 of the composite sheet 103B and the gear teeth 134 of the lower gear roll 132 are not meshed with each other corresponds to the top 23B and the bottom 22B of the protrusion 21B of the top sheet 2B (see FIG. 10). . A portion 105B where the gear teeth 133 of the upper gear roll 131 of the composite sheet 103B and the gear teeth 134 of the lower gear roll 132 mesh with each other corresponds to the wall portion 24B of the ridge portion 21B of the top sheet 2B (see FIG. 10). For this reason, there is no opening part 34B in the top part 23B and bottom part 22B of the protrusion part 21B of the top sheet 2B, and the opening part 34B is provided in the wall part 24B of the protrusion part 21B of the top sheet 2B.

  FIG. 13 shows a micrograph of the skin side of the top sheet in which an opening is formed in the resin film layer. FIG. 13A is a photomicrograph of the skin side of the top sheet showing a plurality of openings lined up in the extending direction of the ridges. FIG.13 (b) is a microscope picture of the skin side of the top sheet which shows the wall part of the protrusion part which has an opening part. FIG.13 (c) is a microscope picture of the skin side of the top sheet which shows the opening part of a film resin layer.

  FIG. 14 shows a photomicrograph on the clothing side of the top sheet in which an opening is formed in the resin film layer. FIG. 14A is a photomicrograph of the clothing side of the top sheet showing the fiber aggregate layer with the substrate destroyed and the resin film layer with the openings formed therein. FIG.14 (b) is a microscope picture of the clothing side of the top sheet which shows the fiber of the fiber assembly layer by which the base material was destroyed which covers the opening part of a resin film layer.

  In the lubricant application step, the above-mentioned lubricant 141 is applied to the resin film layer side surface of the composite sheet 104B gear-stretched using the lubricant application spray 140 to form a lubricant layer on the composite sheet 104B. The amount of lubricant applied is the same as the amount of lubricant applied in the method for manufacturing the top sheet of the absorbent article of the first embodiment.

  In addition, in the manufacturing method of the above-mentioned top sheet 2B, instead of the process of preparing the composite sheet which consists of a resin film layer and a fiber assembly layer, the process of preparing a fiber sheet, and laminating resin to a fiber sheet, fiber You may make it provide the process of producing a composite sheet by forming a resin film layer on a sheet | seat.

The absorbent article of the above first embodiment and the absorbent article of the second embodiment can be modified as follows.
(1) If at least a part of the skin side surface of the top sheet is formed of a resin film in which a lubricant layer is formed on the skin side surface, the top sheet is the same as the absorbent article of the first embodiment. The entire sheet is a resin film 2A in which a lubricant layer 27A is formed on the skin side surface, or the entire skin side surface of the top sheet 2B is on the skin side surface as in the absorbent article of the second embodiment. It may not be resin film 31B in which lubricant layer 33B was formed. For example, on the top sheet of the absorbent article, as in the top sheet 2C shown in FIG. 15, the lubricant layer 33C is formed on the skin side surface of the resin film layer 31C formed in a stripe shape on the skin side surface of the nonwoven fabric or tissue 32C. You may make it form. FIG. 15 is a schematic perspective view in which a part of the top sheet 2C is enlarged. Also in this case, since the lubricant layer 33C exists between the wearer's body fluid and the resin film layer 31C, the body fluid wiping property is improved. In addition, since the bodily fluid adhering to the nonwoven fabric or tissue 31C passes through the nonwoven fabric or tissue 31C and is absorbed by the absorbent body, it is not necessary to wipe off.

  The width of the stripe-shaped resin film layer 31C is, for example, 0.05 to 3 mm, and preferably 0.1 to 1 mm. The distance between adjacent resin film layers 31C is, for example, 0.05 to 3 mm, preferably 0.1 to 1 mm. The stripe-shaped resin film layer 31C is formed on a nonwoven fabric or the like by, for example, continuously applying a resin mainly composed of polyethylene to a substrate such as a nonwoven fabric in a stripe shape and then applying pressure in the thickness direction with a nip roll. Is done.

  A lubricant layer 27 </ b> D may be formed on the surface of the top sheet 2 </ b> D of the resin film described in Patent Document 1 shown in FIG. 16A as shown in FIG. 16B. 16A and 16B are schematic perspective views in which a part of the top sheet 2D is enlarged. Hair-like fibrils 21D are formed on the surface of the top sheet 2D described in Patent Document 1. Therefore, since the bodily fluid remains between the plurality of fibrils 21D, it is difficult to wipe off the bodily fluid from the top sheet 2D. In addition, the hair-like fibrils 21D may damage the toilet paper used when wiping body fluids. However, by forming the lubricant layer 27D on the surface of the top sheet 2D, it is possible to suppress body fluid from remaining between the plurality of fibrils 21D, and it is possible to easily wipe off the body fluid attached to the top sheet 2D. In addition, since the body fluid can be easily wiped off, it is not necessary to strongly rub the top sheet 2D with toilet paper or the like, so that it is possible to prevent the toilet paper or the like used when wiping off the body fluid from being damaged.

  The top sheet 2E (see FIG. 17) that does not form hair-like fibrils on the surface of the top sheet of the resin film described in Patent Document 1 above, that is, the top sheet 2E in which only the opening 25E is formed. The lubricant layer 27E may be formed on the surface. FIG. 17 is a schematic perspective view in which a part of the top sheet 2E is enlarged.

(2) At least in the region facing the body fluid discharge port of the wearer, the top sheet and the absorbent body may not be joined. In this case, at least the region of the top sheet facing the body fluid discharge port of the wearer is formed of a resin film having a lubricant layer formed on the skin side surface. Thereby, the top sheet is easily deformed, and body fluid such as menstrual blood remaining on the surface of the top sheet can be further easily wiped off. In particular, when the top sheet is bent so that the cross-section is substantially wave-shaped, the pressure applied to the surface of the top sheet when the wearer wipes the body fluid with toilet paper or the like, so that the substantially wavy shape of the top sheet is The top sheet tends to become flatter due to deformation. Thereby, it becomes easier to wipe off the body fluid adhering to the surface of the top sheet.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

(Wipeability)
In Examples and Comparative Examples, the wipeability of the top sheet was measured as follows.

(1) The sample was arrange | positioned on the filter paper (100 mm x 100 mm) piled up on three sheets. The filter paper stacked on three sheets corresponds to the absorber.
(2) Using a pipette having an inner diameter of 1.8 mm, 0.1 mg of high-viscosity artificial menstrual blood was dropped onto the sample from a height of 10 mm above the sample at a speed of 100 g / min. The composition of the high-viscosity artificial menstrual blood used at this time is shown below.
Composition of high-viscosity artificial menstrual blood 97% 0.9% physiological saline 3% tamarind gum (trade name: Griloid 6C, purchased from DSP Gokyo Food & Chemical Co., Ltd.)
After adding a small amount of food color Red No. 102 (3), it was left for 1 minute.
(4) After the toilet paper was folded in six to a size of 110 mm × 60 mm, the folded toilet paper was wound around the middle finger of the hand. Then, the toilet paper was moved 30 mm on the surface of the sample under a pressure of 100 to 150 g / cm ² , and the dropped highly viscous artificial menstrual blood was wiped off with the toilet paper.
(5) Measure the mass of the sample after wiping, subtract the mass of the sample before dropping high-viscosity artificial menstrual blood from the measured mass, and calculate the residual amount of high-viscosity artificial menstrual blood remaining in the sample. Calculated.

  Hereinafter, the production methods of Examples and Comparative Examples will be described.

Example 1
Holes were formed in a resin film composed of 97% by weight of polyethylene and 3% by weight of titanium oxide by perforation. The basis weight of the resin film in which the holes were formed was 22 g / m ² , the actual opening diameter was 0.5 to 0.8 mm, and the actual opening area ratio (opening ratio) was 18%. Then, triglyceride (trade name: Panaceto 810s (IOB: 0.32, melting point: −5 ° C., water solubility: <0.05 g, NOF Corporation) on the surface of the resin film at a coating amount of 5 g / m ^2. Purchased) was applied.

(Example 2)
The top sheet of Example 2 was produced by the top sheet manufacturing method in the first embodiment. The production conditions of Example 2 are shown below.
Composition of resin film: 97% by weight of polyethylene, 3% by weight of titanium oxide Pitch of grid-like convex portions of knurl roll: 0.4 mm
Gear tooth width: 0.5mm
Gear tooth height: 1.5mm
Distance between adjacent gear teeth: 1.0 mm
Gap between the gear teeth of the upper gear roll and the gear teeth of the lower gear roll: 0.25 mm
Biting depth of stretched gear roll: 1.1 mm
Lubricant: Triglyceride (trade name: Panacet 810s (IOB: 0.32, melting point: -5 ° C, water solubility: <0.05 g, purchased from NOF Corporation)
Application amount: 5 g / m ²

The form of Example 2 is shown below.
Height of ridge: 0.05mm
Distance between widthwise centers of adjacent ridges (pitch of ridges): 2.5 mm
Diameter of opening: 0.1-0.6mm
Real aperture ratio: 10%

(Comparative Example 1)
The production method of Comparative Example 1 was the same as the production method of Example 1 except that triglyceride was not applied.

(Comparative Example 2)
The production method of Comparative Example 2 was the same as the production method of Example 2 except that triglyceride was not applied.

  The micrograph which image | photographed the surface of Example 1 and 2 and Comparative Example 1 and 2 is shown in FIG. 18A is a photomicrograph of the surface of Example 1, FIG. 18B is a photomicrograph of the surface of Example 2, and FIG. 18C is the surface of Comparative Example 1. FIG. 18D is a photomicrograph taken of the surface of Comparative Example 2. FIG.

  The result of the wiping test of an Example and a comparative example is shown below.

  FIG. 19 shows the surface states of Examples and Comparative Examples after dropping high-viscosity artificial menstrual blood into Examples and Comparative Examples and leaving them for 1 minute. FIG. 19 (a) is a photograph showing the surface state of Example 1, FIG. 19 (b) is a photograph showing the surface state of Example 2, and FIG. 19 (c) is Comparative Example 1. FIG. 19D is a photograph showing the surface state of Comparative Example 2. FIG.

  The state of the surface of the toilet paper after wiping off high-viscosity artificial menstrual blood from Examples and Comparative Examples is shown in FIG. 20 (a) is a photograph showing the state of the surface of the toilet paper after wiping off high-viscosity artificial menstrual blood from Example 1, and FIG. 20 (b) shows high-viscosity artificial menstrual blood from Example 2. FIG. 20 (c) is a photograph showing the state of the surface of the toilet paper after wiping off high-viscosity artificial menstrual blood from Comparative Example 1, and FIG. 20 (d) is a photograph showing the state of the surface of the toilet paper after the high-viscosity artificial menstrual blood has been wiped from Comparative Example 2.

  The state of the surface of the Example and comparative example after wiping off highly viscous artificial menstrual blood using toilet paper is shown in FIG. FIG. 21A is a photograph showing the surface state of Example 1, FIG. 21B is a photograph showing the surface state of Example 2, and FIG. 21C is Comparative Example 1. FIG. 21D is a photograph showing the surface state of Comparative Example 2. FIG.

  From the photograph of FIG. 21, compared with the surface of Comparative Example 1, the surface of Example 1 has no high-viscosity artificial menstrual blood remaining, and compared to the surface of Comparative Example 2, the surface of Example 2 It was found that no high-viscosity artificial menstrual blood remained. From this, it was found that high-viscosity artificial menstrual blood adhering to the top sheet can be wiped clean by applying a lubricant to the top sheet.

  The residual amount of the high-viscosity artificial menstrual blood of Example 1 after wiping off the high-viscosity artificial menstrual blood using toilet paper is 0.01 g, and the residual amount of the high-viscosity artificial menstrual blood of Example 2 is 0.00 g. The residual amount of high-viscosity artificial menstrual blood of Comparative Example 1 was 0.03 g, and the residual amount of high-viscosity artificial menstrual blood of Comparative Example 2 was 0.02 g. From now on, it was found that high-viscosity artificial menstrual blood adhering to the top sheet can be wiped clean by applying the lubricant to the top sheet.

  Compared to Example 1, Example 2 has less high-viscosity artificial menstrual blood remaining after wiping. This is because when the high-viscosity artificial menstrual blood is wiped off with toilet paper, the protrusions of Example 2 are deformed by the pressure applied to the surface of Example 2, and the surface of Example 2 becomes flat. This is probably because the attached high-viscosity artificial menstrual blood has become easier to wipe off.

(Mechanism that blood modifying agent lowers blood viscosity and surface tension)
The following examples confirmed that the blood modifying agent has a mechanism for lowering the viscosity and surface tension of blood.

[Example 1]
[Evaluation of rewetting rate and absorber transfer speed]
A commercially available sanitary napkin was prepared. The sanitary napkin includes a top sheet formed from an air-through nonwoven fabric (composite fiber made of polyester and polyethylene terephthalate, basis weight: 35 g / m ² ) treated with a hydrophilic agent, and an air-through nonwoven fabric (composite made of polyester and polyethylene terephthalate). Second sheet formed from fiber, basis weight: 30 g / m ² ), pulp (basis weight: 150 to 450 g / m ² , more in the center), acrylic superabsorbent polymer (basis weight: 15 g / m ² ) And an absorbent body containing a tissue as a core wrap, a side sheet treated with a water repellent, and a back sheet made of a polyethylene film.

The blood modifying agents used in the experiment are listed below.
[Ester of (A ₁ ) chain hydrocarbon tetraol and fatty acid]
Unistar H-408BRS, manufactured by NOF Corporation Tetra-2-ethylhexanoic acid pentaerythritol UNISTAR H-2408BRS-22, manufactured by NOF Corporation Tetra-2-ethylhexanoic acid pentaerythritol and di-2-ethylhexanoic acid neopentyl Mixture with glycol (58:42, weight ratio)

[(A ₂ ) Ester of Chain Hydrocarbon Triol and Fatty Acid]
・ Cetiol SB45DEO, manufactured by Cognis Japan Co., Ltd. Fatty acid is oleic acid or stearyl acid, triester of glycerin and fatty acid ・ Tri-C2L oil fatty acid glyceride, manufactured by NOF Corporation C ₈ fatty acid: C ₁₀ fatty acid: C Triester / tri-CL oil fatty acid glycerides of glycerin and fatty acid containing ₁₂ fatty acids in a weight ratio of approximately 37: 7: 56, manufactured by NOF Corporation C ₈ fatty acids and C ₁₂ fatty acids approximately 44 : Triester of glycerin and fatty acid, contained in a weight ratio of 56

· PANACET 810s, NOF Corp. C ₈ fatty acids: fatty acids to C ₁₀ are contained in approximately 85:15 weight ratio of tri-ester PANACET 800 of glycerin and fatty acids, manufactured by NOF Corporation fatty Triester of glycerin and fatty acid, all octanoic acid (C ₈ )

・ Panasate 800B, manufactured by NOF Corporation All fatty acids are 2-ethylhexanoic acid (C ₈ ), triester of glycerin and fatty acid NA36, manufactured by NOF Corporation C ₁₆ fatty acids: C ₁₈ fatty acids: C Triester of glycerin and fatty acid containing ₂₀ fatty acids (including both saturated and unsaturated fatty acids) in a weight ratio of approximately 5: 92: 3

· Tri-coconut oil fatty acid glyceride, NOF fatty Ltd. C _8: fatty C _10: fatty acid C _12: fatty acid C _14: (including both saturated and unsaturated fatty acids) fatty acids C ₁₆ is approximately 4 : 8: 60: 25: are included in a weight ratio of 3, triesters · SOY42, manufactured by NOF Corporation C ₁₄ fatty acid of glycerin and fatty acids: fatty acids C _16: fatty acid C _18: to C ₂₀ Triester of glycerin and fatty acid containing fatty acids (including both saturated and unsaturated fatty acids) in a weight ratio of approximately 0.2: 11: 88: 0.8

- caprylic acid diglyceride, manufactured by NOF Corporation fatty acid is octanoic acid, diesters of glycerin and fatty acid [(A ₃₎ an ester of a chain hydrocarbon diol and fatty acid]
・ COMPOL BL, NOF Co., Ltd. Butylene glycol dodecanoic acid (C ₁₂ ) monoester ・ COMPOL BS, NOF Corporation Butylene glycol octadecanoic acid (C ₁₈ ) monoester ・ Unistar H-208BRS, NOF Di-2-ethylhexanoic acid neopentyl glycol

[(C ₃ ) Ester of linear hydrocarbon dicarboxylic acid having 2 carboxyl groups, hydroxy acid, alkoxy acid or oxo acid and aliphatic monohydric alcohol]
・ Dioctyl adipate, manufactured by Wako Pure Chemical Industries, Ltd. [Ester of (D ₃ ) fatty acid and aliphatic monohydric alcohol]
Electol WE20, ester of dodecanoic acid (C ₁₂ ) manufactured by NOF Corporation and dodecyl alcohol (C ₁₂ ), Electol WE40, tetradecanoic acid (C ₁₄ ) manufactured by NOF Corporation, and dodecyl alcohol (C ₁₂ ) Esters

[(E ₁₎ poly C _{2 ~ 6} alkylene glycol]
・ Uniol D-1000 (Uniol is all made by NOF Corporation)
Polypropylene glycol uniol D-1200 having a weight average molecular weight of about 1,000
Polypropylene glycol uniol D-3000 having a weight average molecular weight of about 1,200

Polypropylene glycol uniol D-4000 having a weight average molecular weight of about 3000
Polypropylene glycol uniol PB500 with a weight average molecular weight of about 4000
Polybutylene glycol uniol PB700 having a weight average molecular weight of about 500
Polyoxybutylene polyoxypropylene glycol uniol PB1000R having a weight average molecular weight of about 700
Polybutylene glycol with a weight average molecular weight of about 1000

[(E ₂₎ an ester of a poly C _{2 ~ 6} alkylene glycol and fatty acid]
Will Bright cp9, manufactured by NOF Corporation both terminal OH groups are esterified by hexadecanoic acid (C _16), polybutylene glycol having a weight average molecular weight of about 1,100 [(E ₃₎ poly C _{2 ~ 6} Ether of alkylene glycol and fatty acid]
・ Uniluve MS-70K, NOF Co., Ltd. polypropylene glycol stearyl ether, about 15 repeating units

[(F ₁ ) chain alkane]
Pearl Ream 6, manufactured by NOF Corporation Branched chain hydrocarbons produced by copolymerizing liquid isoparaffin, isobutene and n-butene and then adding hydrogen, degree of polymerization: about 5 to about 10

[Others]
・ NA50, made by NOF Corporation Hydrogen added to NA36 to reduce the ratio of double bond derived from unsaturated fatty acid as raw material Triester of glycerin and fatty acid ・ (Caprylic acid / Capric acid) monoglyceride, Japan Monoester of glycerin and fatty acid containing Octanoic acid (C ₈ ) and Decanoic acid (C ₁₀ ), approximately 85:15, manufactured by Oil Co., Ltd. Monomuls 90-L2 lauric acid monoglyceride, Cognis Japan Co., Ltd. Made by company

・ Uniox HC60, polyoxyethylene hydrogenated castor oil manufactured by NOF Corporation

・ Wilbright s753, NOF Corporation polyoxyethylene polyoxypropylene polyoxybutylene glycerin ・ Isopropyl citrate, manufactured by Tokyo Chemical Industry ・ Uniol D-400
Polypropylene glycol uniol TG-330 having a weight average molecular weight of about 400, manufactured by NOF Corporation Glyceryl ether of polypropylene glycol, about 6 repeating units, weight average molecular weight: about 330

-Uniol TG-1000, manufactured by NOF Corporation Polyglycol glycol glyceryl ether, about 16 repeating units, weight average molecular weight: about 1000
Unilube DGP-700, manufactured by NOF Corporation Polyglycol glycol diglyceryl ether, about 9 repeating units, weight average molecular weight: about 700
-PEG 1500, manufactured by NOF Corporation, polyethylene glycol having a weight average molecular weight of about 1,500 to about 1,600

Nonionic S-6, polyoxyethylene monostearate manufactured by NOF Corporation, about 7 repeating units, weight average molecular weight: about 600
・ Vaseline, manufactured by Cognis Japan Co., Ltd. Petroleum-derived hydrocarbon, semi-solid

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

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

  In Example 1, the range in which the top sheet contains a blood modifying agent is shown in FIG. As shown in FIG. 22, in Example 1, almost the entire surface of the top sheet 220 of the sanitary napkin 200 is a blood modifying agent-containing region 240 containing a blood modifying agent. In addition, in FIG. 22, the code | symbol 230 shows a pressing part.

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

Immediately after the second drop of blood, remove the acrylic plate immediately, place 10 pieces of filter paper (50 mm x 35 mm) at the place where the blood was dropped, and place a weight on top of it so that the pressure is 30 g / cm ^2. It was. After 1 minute, the filter paper was taken out, and the “rewetting rate” was calculated according to the following formula.
Rewetting rate (%) = 100 × (filter paper mass after test−initial filter paper mass) / 6

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

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

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

  Similarly, a blood modifying agent having an IOB of about 0 to about 0.60, a melting point of about 45 ° C. or less, and a water solubility of about 0.05 g or less with respect to 100 g of water at 25 ° C. greatly improves the absorption performance. I found out that

Next, no. No. 1-42 sanitary napkins were worn by a plurality of volunteer subjects. In the sanitary napkin containing 1 to 28 blood modifying agents, the top sheet was not sticky even after menstrual blood was absorbed, and the answer was that the top sheet was smooth. In particular, these are no. The answer that the difference with the sanitary napkin of 29, 32, 39, 41, and 42 was remarkable was obtained.
No. 1 to 28 sanitary napkins, and in particular No. In the sanitary napkin containing the blood modifying agents 1 to 11, 15 to 18 and 28, the skin contact surface of the top sheet after absorbing menstrual blood is not stained red with blood, and there is little discomfort Got an answer.

[Example 2]
The above rewet rate was evaluated for various blood samples of animals. The blood used in the experiment is as follows.
[Animal species]
(1) Human (2) Horse (3) Sheep

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

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

Absorbent articles were produced in the same manner as in Example 1 except that the tri-C2L oil fatty acid glyceride was applied so that the basis weight was approximately 5 g / m ^2, and the above-described rewetting rates of various blood were evaluated. The measurement was performed 3 times for each blood, and the average value was adopted.
The results are shown in Table 3 below.

  Similar trends to equine EDTA blood obtained in Example 1 were obtained with human and sheep blood. Similar trends were also observed in defibrinated blood and EDTA blood.

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

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

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

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

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

[Example 4]
[Viscosity of blood containing blood modifying agents]
The viscosity of blood containing a blood modifying agent was measured using Rheometric Expansion System ARES (Rheometric Scientific, Inc). 2% by mass of panacet 810s was added to equine defibrinated blood, lightly stirred to form a sample, the sample was placed on a parallel plate with a diameter of 50 mm, the gap was 100 μm, and the viscosity was measured at 37 ± 0.5 ° C. . Because of the parallel plate, the sample did not have a uniform shear rate, but the average shear rate displayed on the instrument was 10 s ⁻¹ .

The viscosity of equine defibrinated blood containing 2% by mass of panacet 810s was 5.9 mPa · s, while the viscosity of equine defibrinated blood containing no blood modifying agent was 50.4 mPa · s. Therefore, it can be seen that equine defibrinated blood containing 2% by mass of panacet 810s lowers the viscosity by about 90% compared to the case where no blood modifying agent is contained.
Although blood is known to contain components such as blood cells and have thixotropic properties, the blood modifying agent of the present disclosure is considered to be able to lower the viscosity of blood in a low viscosity range. It is considered that the absorbed menstrual blood can be quickly transferred from the top sheet to the absorber by lowering the viscosity of the blood.

The blood modifying agent is prepared by adding 2% by mass of the blood modifying agent to equine defibrinated blood to quickly transfer absorbed menstrual blood from the top sheet to the absorbent body, at 37 ° C. and a shear rate of 10 s. ^{When the} viscosity is measured under the condition of ^-1 , the viscosity of the equine defibrinated blood is preferably reduced by at least 50%, more preferably by at least 60%, and at least 70% lower than before addition. More preferably, and most preferably at least 80% lower.

[Example 5]
[Micrograph of blood containing blood modifying agent]
The menstrual blood of healthy volunteers was collected on saran wrap, and a portion of panacet 810s dispersed in 10 times the mass of phosphate buffered saline was added so that the concentration of panacet 810s was 1% by mass. . Menstrual blood was appropriately applied to a slide glass, covered with a cover glass, and the state of red blood cells was observed with an optical microscope. A photomicrograph of menstrual blood containing no blood modifying agent is shown in FIG. 23 (a), and a photomicrograph of menstrual blood containing panacet 810s is shown in FIG. 23 (b).

  From FIG. 23, in menstrual blood that does not contain a blood modifying agent, red blood cells form a collective lump such as remuneration, but in menstrual blood that includes panacet 810s, each red blood cell is stably dispersed. I understand. Therefore, it is suggested that the blood modifying agent functions to stabilize red blood cells in the blood.

[Example 6]
[Surface tension of blood containing blood modifying agents]
The surface tension of blood containing a blood modifying agent was measured by a pendant drop method using a contact angle meter Drop Master 500 manufactured by Kyowa Interface Science Co., Ltd. The surface tension was measured after adding a predetermined amount of blood modifying agent to sheep defibrinated blood and shaking sufficiently.
The measurement is automatically performed by the instrument, and the density γ is obtained by the following equation (see FIG. 24).

γ = g × ρ × (de) ² × 1 / H
g: Gravity constant 1 / H: Correction term obtained from ds / de ρ: Density de: Maximum diameter ds: Diameter at a position that is de higher than the dropping end

The density ρ is defined in 5. of “Density Test Method and Density / Mass / Capacity Conversion Table” of JIS K 2249-1995. Based on the vibration density test method, the temperature was measured as shown in Table 5.
For the measurement, DA-505 of Kyoto Electronics Industry Co., Ltd. was used.
The results are shown in Table 5 below.

From Table 5, it is clear from the fact that the blood modifying agent has a water solubility of 0.05 g or less with respect to 100 g of water at 25 ° C., but the solubility in water is very low. You can see that it can be lowered.
By reducing the surface tension of the blood, it is considered that the absorbed blood can be quickly transferred to the absorbent body without being held between the fibers of the top sheet.

  It is also possible to combine one or a plurality of embodiments and modifications. It is possible to combine the modified examples in any way.

  The above description is merely an example, and the present invention is not limited to the above embodiment.

DESCRIPTION OF SYMBOLS 1 Absorbent article 2A-2E Top sheet 3 Back sheet 4 Absorber 5 Wing part 6 Adhesive part 21A, 21B Projection part 22A, 22B Bottom part 23A, 23B Top part 24A, 24B Wall part 25A, 34B Opening part 26A Concave part 27A, 27D 27E, 33B, 33C Lubricant layer 100A, 100B Top sheet manufacturing apparatus 120A Concave forming roll 121A Knurled roll 122A Preheating roll having smooth surface 130 Stretched gear roll 131 Upper gear roll 132 Lower gear roll 133, 134 Gear teeth 140 Lubricant application spray 141 Lubricant

Claims (10)

A liquid-permeable top sheet provided on the skin side, a liquid-impermeable back sheet provided on the clothing side, and a liquid-retaining absorbent provided between the top sheet and the back sheet An absorbent article comprising:
At least a part of the skin side surface of the top sheet is formed of a resin film in which a lubricant layer is formed on the skin side surface,
The lubricant layer is an absorbent article having water repellency and / or oil repellency.   The lubricant of the lubricant layer is a blood modifying agent having an IOB of 0 to 0.60, a melting point of 45 ° C or lower, and a water solubility of 0.05g or lower with respect to 100g of water at 25 ° C. The absorbent article as described. The blood modifying agent is
(I) hydrocarbons,
(Ii) a compound in which at least one carbonyl bond (—CO—) and / or at least one ether bond (—O—) is inserted between C—C single bonds of hydrocarbon, or (iii) At least one carbonyl bond (—CO—) and / or at least one ether bond (—O—) is inserted between the C—C single bonds, and at least one hydrogen atom on the hydrocarbon is a carboxyl group ( -COOH) or a compound substituted with a hydroxyl group (-OH),
Here, in the compound of (ii) or (iii), when two or more ether bonds are inserted, the ether bonds are not adjacent to each other.
The absorbent article according to claim 2. The blood modifying agent is
(I ′) hydrocarbon,
(Ii ′) at least one carbonyl bond (—CO—), at least one ester bond (—COO—), at least one carbonate bond (—OCOO—) and / or between the C—C single bonds of the hydrocarbon; A compound in which at least one ether bond (—O—) is inserted, or (iii ′) at least one carbonyl bond (—CO—), at least one ester bond (— COO-), at least one carbonate bond (-OCOO-) and / or at least one ether bond (-O-), and at least one hydrogen atom on the hydrocarbon is a carboxyl group (-COOH) or A compound substituted with a hydroxyl group (—OH),
Where, in the compound of (ii ′) or (iii ′), when two or more bonds are inserted, each bond is not adjacent,
The absorbent article according to claim 2 or 3.   In the hydrocarbon, the blood modifying agent is not more than 1.8 carbonyl bonds (—CO—), not more than 2 ester bonds (—COO—), and not more than carbonate bonds (—OCOO—) per 10 carbon atoms. ) 1.5 or less, ether bond (—O—) 6 or less, carboxyl group (—COOH) 0.8 or less, and / or hydroxyl group (—OH) 1.2 or less The absorbent article according to any one of claims 2 to 4, wherein The blood modifying agent is
(A) an ester of a compound having 2 to 4 hydroxyl groups and a compound having 1 carboxyl group,
(B) an ether of a compound having 2 to 4 hydroxyl groups and a compound having 1 hydroxyl group,
(C) an ester of a compound having 2 to 4 carboxyl groups and a compound having 1 hydroxyl group,
(D) The hydrocarbon has any one selected from the group consisting of an ether bond (—O—), a carbonyl bond (—CO—), an ester bond (—COO—), and a carbonate bond (—OCOO—). Inserted compound,
(E) poly C _{2 ~ 6} alkylene glycol or an ester or ether, or (F) a chain hydrocarbon,
The absorbent article according to any one of claims 2 to 5, wherein The blood modifying agent comprises (A ₁ ) an ester of a chain hydrocarbon tetraol and a fatty acid, (A ₂ ) an ester of a chain hydrocarbon triol and a fatty acid, (A ₃ ) a chain hydrocarbon diol and a fatty acid. An ester of (B ₁ ) a chain hydrocarbon tetraol and an aliphatic monohydric alcohol, (B ₂ ) an ether of a chain hydrocarbon triol and an aliphatic monohydric alcohol, (B ₃ ) a chain hydrocarbon An ether of a diol and an aliphatic monohydric alcohol, (C ₁ ) an ester of a linear hydrocarbon tetracarboxylic acid having four carboxyl groups, a hydroxy acid, an alkoxy acid or an oxo acid and an aliphatic monohydric alcohol; C ₂₎ chain hydrocarbon tricarboxylic acids having 3 carboxyl groups, hydroxy acids, esters of alkoxy acids or oxoacids, and aliphatic monohydric alcohols, (C ₃₎ Chain hydrocarbon dicarboxylic acids having number of carboxyl groups, ether hydroxy acid, alkoxy acid or oxo acid, an ester of an aliphatic monohydric alcohol, and (D ₁₎ aliphatic monohydric alcohol and an aliphatic monohydric alcohol , (D ₂₎ dialkyl ketone, (D ₃₎ an ester of a fatty acid and an aliphatic monohydric alcohol, (D ₄₎ dialkyl carbonates, (E ₁₎ poly C _{2 ~ 6} alkylene glycol, (E ₂₎ poly C _{2 ~ 6} esters of alkylene glycols with fatty acids, (E ₃₎ poly C _{2 ~ 6} alkylene glycol and an aliphatic monohydric ether alcohols, (E ₄₎ poly C _{2 ~ 6} alkylene glycol and a chain hydrocarbon tetracarboxylic acid , chain hydrocarbon tricarboxylic acid or ester of a chain hydrocarbon dicarboxylic acid,, (E ₅₎ and poly C _{2 ~ 6} alkylene glycol, a chain hydrocarbon The absorption according to any one of claims 2 to 6, selected from the group consisting of silicon tetraols, chain hydrocarbon triols, ethers with chain hydrocarbon diols, and (F ₁ ) chain alkanes. Sex goods.   The absorbent article according to any one of claims 2 to 7, wherein the blood modifying agent has a weight average molecular weight of 2000 or less. The top sheet includes a plurality of protrusions arranged in parallel, and a bottom part arranged between adjacent protrusions, which are formed by being bent so that the cross-section is substantially wave-shaped.
The absorbent article according to any one of claims 1 to 8, wherein the protrusion includes a wall having a plurality of openings arranged in a direction in which the protrusion extends. The region facing the body fluid discharge port of at least the wearer of the top sheet is formed of the resin film in which the lubricant layer is formed on the skin side surface,
The absorbent article according to any one of claims 1 to 9, wherein the top sheet and the absorbent body are not joined at least in a region facing the body fluid discharge port of the wearer.