TWI577396B - Absorbent items - Google Patents

Description

Absorbent article

The present invention relates to an absorbent article such as a disposable diaper or a sanitary napkin.

An absorbent article in which a plurality of polyolefin films are formed as a surface sheet by the opening of the body fluid of the user is known (for example, Patent Document 1). The body fluid of the user passes through the opening and is absorbed by the absorber.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Publication No. 2006-515539

In countries such as India, in the toilet, the menstrual blood attached to the surface of the sanitary napkin is wiped with toilet paper or the like, so that there is a habit of using one piece of sanitary napkin for a long time. However, as described in Patent Document 1, in the past, in the absorbent article, the menstrual blood adhering to the surface of the sanitary napkin is wiped with toilet paper or the like, and a large amount of menstrual blood may remain on the surface of the surface sheet. At this time, since the menstrual blood remains on the surface of the surface sheet, the sanitary napkin is unclean when the sanitary napkin is seen in the toilet.

The present invention provides an absorbent article which is provided with a body fluid such as menstrual blood adhered to a surface sheet to be wiped with a toilet paper or the like, or which has no residual body fluid. purpose.

In order to solve the above problems, the present invention adopts the following configuration.

In other words, the present invention provides a liquid-permeable surface sheet provided on the skin side, a liquid-impermeable back sheet provided on the garment side, and a liquid-retaining absorber provided between the surface sheet and the back sheet. In the absorbent article, at least a portion of at least the skin side surface of the topsheet is formed by a resin film which forms a lubricant layer on the skin side, and the lubricant layer has water repellency and/or oil repellency.

In the present invention, when the body fluid adhering to the surface sheet is wiped with toilet paper or the like, the amount of the residual body fluid is small, or the body fluid does not remain.

[Formation of the Invention] - First embodiment -

Hereinafter, the absorbent article according to the first embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited to those described in the drawings.

Fig. 1 is a partially broken plan view of the absorbent article according to the first embodiment of the present invention, and Fig. 2 is a schematic cross-sectional view taken along line A-A of Fig. 1. The absorbent article 1 is provided with a liquid-permeable top sheet 2A provided on the skin side, a liquid-impermeable back sheet 3 provided on the garment side, and a liquid retaining layer provided between the top sheet 2A and the back sheet 3. Sexual absorber 4. The back sheet 3 is formed to extend in the width direction to form a pair of wing portions 5. An adhesive portion 6 is provided on the garment side of the wing portion 5. In addition, 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. Further, the plane direction of the absorbent article 1 is the XY direction.

The top sheet 2A is a body fluid that moves urine or menstrual blood discharged from the user to the absorber 4. At least a portion of the top sheet 2A is liquid permeable to form a resin film which is intended to penetrate a plurality of openings of the body fluid. As the resin film used for the surface sheet 2A, a copolymer of an olefin with another monomer such as acrylate or vinyl acetate, polyolefin, polyester, polypropylene, polyethylene, polyethylene terephthalate or polyamine can be used. , made of cellulose acetate, etc. From the viewpoint of less irritation to the skin when the flexibility is high, the resin film used as the surface sheet 2 is particularly preferably a copolymer of an olefin and another monomer or a polyolefin.

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. Further, the thickness of the surface 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 surface sheet 2A is less than 0.01 mm, the concealability of the surface sheet 2 may become too small, and if the thickness of the surface sheet 2A exceeds 0.4 mm, the rigidity of the surface sheet 2A becomes high, which is suitable for the user. The stimulation of the skin sheet 2A of the skin is not too strong.

The top sheet 2A is intended to make the body fluid absorbed in the absorbent body 4 invisible from the outside. The concealability of the surface sheet 2A is produced by mixing an inorganic filler such as titanium oxide with a resin. When the filler is titanium oxide, the content of titanium oxide is 1% or more based on the weight of the resin. 50% or less is preferable, preferably 3% or more and 15% or less. When the content of the titanium oxide is less than 1% by weight of the resin film, the concealing effect of the body fluid absorbed by the absorber 4 in the surface sheet 2A is too small. When the content of the titanium oxide exceeds 50% by weight of the resin film, the resin containing titanium oxide may be difficult to form into a sheet.

The top sheet 2A is intended to reduce the contact area between the skin of the user and the top sheet 2A, and to improve the skin contact of the top sheet 2A, and the cross section in the width direction is curved in a slightly wavy shape. Further, the surface sheet 2A may have a slightly wavy cross section in the direction in which the film is grown. The top sheet 2A is curved in a slightly wavy shape. When the user wipes the body fluid such as menstrual blood with a toilet paper or the like, the slightly wavy shape of the surface sheet 2A is deformed by the pressure applied to the surface of the surface sheet 2A, and the surface sheet 2A is flattened and adhered to the surface sheet. The body fluid on the 2A surface will become easy to wipe.

The surface sheet 2 will be further described in detail with reference to FIG.

The surface sheet 2A in which the cross section in the width direction is curved in a slightly corrugated shape is a bottom portion 22A disposed between the ridge portion 21A extending in the longitudinal direction and the adjacent rib portion 21A. Further, the direction in which the ridge portion 21A is to be extended is not limited to the long direction. The ridge portion 21A has a top portion 23A that contacts the skin of the user and a wall portion 24A on the side surface. The height in the thickness direction of the ridge portion 21A, that is, the height difference between the top portion 23A and the bottom portion 22A in the thickness direction is preferably 0.1 mm or more and 5 mm or less. When the height difference in the thickness direction between the top portion 23A and the bottom portion 22A is less than 0.1 mm, the body liquid that has been absorbed by the absorber 4 passes through the surface sheet 2, and the opening portion 25A may be reversed. Thickness difference in thickness direction between top 23A and bottom 22A When the user uses the absorbent article 1 at a height of 5 mm, the ridge portion 21A may collapse.

The wall portion 24A is not vertical with respect to the bottom portion 22A, and it is preferable to exhibit the inclination. That is, the angle formed by the bottom portion 22A and the wall portion 24A is preferably larger than 90 degrees. However, the angle formed by the bottom portion 22A and the wall portion 24A is preferably 165 or less. When the angle formed by the bottom portion 22A and the wall portion 24A is 90 or less, the resin film must exhibit greater plastic deformation, and when the angle between the bottom portion 22A and the wall portion 24A is 90 or less, the strength of the surface sheet 2A becomes variable. Very weak. When the angle between the bottom portion 22 and the wall portion 24 is larger than 165°, the body fluid absorbed by the absorber 4 passes through the opening portion 25A of the surface sheet 2A, and the backflow is reversed, or the absorber 4 of the opening portion 25A described later is passed. The absorbed body fluid is seen, and the concealability of the surface sheet 2A becomes small.

The wall portion 24A of the top sheet 2A has a plurality of openings 25A that are juxtaposed in the extending direction (long direction) of the ridge portion 21A. The opening 25A is a hole penetrating the surface sheet 2A, and the body fluid of the wearer is absorbed by the absorber 4 through the opening 25A. The opening area of the one opening portion 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 0.001 mm ² hours, the body fluid of the user does not pass through the opening 25A, and when the opening area of one opening 25A is larger than 1 mm ² , the absorption body 4 absorbs once. The body fluid passes back through the opening portion 25A of the surface sheet 2A, so that the body fluid absorbed by the absorber 4 through the opening portion 25A is seen, and the concealability of the surface sheet 2A becomes small.

The ratio of the total opening area of the area of the surface sheet 2A, that is, the opening ratio of the surface sheet 2A is preferably 5% or more and 20% or less. When the aperture ratio of the surface sheet 2A is less than 5%, the permeability of the body fluid in the surface sheet 2A is deteriorated. When the aperture ratio of the surface sheet 2A is larger than 20%, the body fluid absorbed in the absorber 4 passes through the surface layer. The opening portion 25A of the sheet 2A flows back, and the body fluid absorbed by the opening portion 25A in the absorber 4 is seen, so that the concealability of the surface sheet 2A is reduced.

The opening portion 25A is formed by the vicinity of the top portion 23A passing near the bottom portion 22A. Therefore, even when a large amount of body fluid is discharged by the user, the absorbent article 1 absorbs the body fluid, so that leakage of the body 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 which are juxtaposed in the extending direction (long direction) of the ridge portion 21A. The shape of the concave portion 26A in the planar direction is, for example, a rhombus shape, and the length of one side of the rhombic shape is, for example, 0.15 mm, and the distance between two adjacent concave portions is, for example, 0.34 mm. Further, the shape of the concave portion 26A in the planar direction is not limited to the rhombic shape, and may be a square shape, a rectangular shape, a triangular shape, a circular shape, a star shape, or a linear shape (linear shape). Further, the size of the concave portion 26A is not limited to 0.15 mm × 0.15 mm, and the distance between the adjacent two concave portions is not limited to 0.34 mm. The depth of the concave portion 26A is not particularly limited as long as the skin of the user contacts the top portion 23A of the surface sheet 2A, so that the skin of the user does not contact the bottom portion of the concave portion 26A. The bottom portion 22A of the top sheet 2A may also have a plurality of concave portions 26A which may or may not be juxtaposed in the extending direction (long direction) of the ridge portion 21A.

The concave portion 26A provided in the top portion 23A is intended to reduce the contact area of the top portion 23A which is in direct contact with the skin of the user, thereby suppressing the adhesion of the absorbent article 1 to the skin during use, thereby suppressing the user's use. Uncomfortable or itching, as well as skin problems such as rashes caused by the user. Further, the lubricant described later is housed in the recess 26A. As a result, after the body fluid such as menstrual blood adhered to the surface sheet 2A is wiped with toilet paper or the like, the lubricant remains in the concave portion 26A, and the lubricant remaining in the concave portion 26A is expanded on the surface of the surface sheet 2A to be applied to the slip layer. 27A supplements the slip agent.

The lubricant layer 27A is formed on the skin side surface of the surface sheet 2A by applying a lubricant to the surface of the surface sheet 2A. By the slip layer 27A, the body fluid such as menstrual blood adhering to the surface sheet 2A is wiped with toilet paper or the like, and the remaining body fluid is small or no body fluid remains. Further, the lubricant layer 27A may be formed entirely in the surface sheet 2A, or the absorbent article 1 may correspond to only the region where the user's body fluid is discharged, and the lubricant layer 27A may be formed on the surface sheet 2A. That is, the lubricant layer 27A can be formed on at least a portion of the surface of the surface 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 can impart water repellency and/or oil repellency to the surface sheet 2A, and is preferably a fluorine compound, a hydrazine compound, or a blood modifying agent. The slip agent of the slip 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 less, and a water solubility of 0.05 g or less for 25 ° C.

Since the melting point of the blood modifying agent is 45 ° C or less, even if the blood modifying agent is solid, the blood modifying agent will liquefy when it comes into contact with a body fluid of 30 to 40 ° C. to Since the liquid-like blood modifying agent is present between the body fluid and the surface sheet 2A, the body fluid adhered to the surface sheet 2A is wiped with toilet paper or the like, and the remaining body fluid is less or no body fluid remains.

Blood modifying agents are mechanisms that reduce the viscosity and surface tension of blood. Thereby, when the high-viscosity body fluid adheres to the surface sheet 2A, the viscosity and surface tension of the adhered body fluid become small, so that the attached body fluid can be easily wiped off.

IOB (Inorganic Organic Balance) indicates the balance index of hydrophilicity and lipophilicity. In this specification, it is the formula of Oda: IOB=inorganic value/organic value

The calculated value.

The inorganic value and the organic value are based on the organic concept map described in the field of "The prediction of organic compounds and organic concept map" by Fujita Mu, Vol. 11, No. 10 (1957) p. 719-725).

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

For example, an ester of a carbon number of 14 tetradecanoic acid and a carbon number 12 dodecyl alcohol has an organic value of 520 (CH ₂ , 20 × 26) and an inorganic value of 60 (-COOR, 60 × 1), so IOB = 0.12.

For the above blood modifying agent, IOB is preferably from about 0 to about 0.60, preferably from about 0 to about 0.50, more preferably from about 0 to about 0.40, most preferably from about 0 to about 0.30. Because the lower the IOB, the higher the organicity, the higher the affinity with the blood cells.

The "melting point" in the present specification is the peak temperature of the endothermic peak when changing from a solid state to a liquid state at a temperature increase rate of 10 ° C / min by a differential scanning calorimeter. The melting point is measured by, for example, a DSC-60 type DSC measuring apparatus manufactured by Shimadzu Corporation, at a temperature increase rate of 10 ° C / min.

The blood modifying agent may have a melting point of about 45 ° C or less, may be liquid at room temperature, or may be solid, that is, the melting point may be above about 25 ° C, or may be less than about 25 ° C, for example, may have about -5 °C, about -20 ° C and other melting points. The melting point of the above blood modifying agent may be about 45 ° C or less as shown below.

The blood modifying agent has no lower limit at the melting point, but the vapor pressure is preferably lower. The vapor pressure of the blood modifying agent is preferably about 0.01 Pa or less at 1 atm and 25 ° C, preferably about 0.001 Pa or less, more preferably about 0.0001 Pa or less. The absorbent article disclosed in the present invention is preferably used in contact with a human body, and the vapor pressure is preferably about 0.01 Pa or less at 1 atm and 40 ° C, preferably about 0.001 Pa or less, and about 0.0001 Pa or less. For better. Because if the vapor pressure is high, there will be problems such as gasification during storage, reduction of blood reforming dose, and odor during use.

Moreover, the melting point of the blood modifying agent can be classified according to the climate, the length of time of use, and the like. For example, when a blood modifying agent having a melting point of about 10 ° C or less is used in an area having an average temperature of 10 ° C or less, it can be cooled by ambient temperature after excretion by blood, and the blood modifying agent can stably reform the blood.

Further, when the absorbent article is used for a long period of time, the melting point of the blood modifying agent is preferably higher in the range of 45 ° C or lower. Because it is not susceptible to sweat, friction during use, etc., even if it is used for a long time, it is not easy to move blood. Liquid modifier.

When the water solubility is 25 ° C, 0.05 g of the sample is added to 100 g of the deionized water, and allowed to stand for 24 hours. After 24 hours, it is simply stirred as necessary, and it is judged whether or not the sample has a water solubility of 0.05 g or less or not.

Further, in the present specification, in the "dissolution" of the water solubility, the sample is completely dissolved in the deionized water, and the case where the homogeneous mixture is formed and the sample is completely emulsified is included. Further, the term "complete" means a block shape in which no sample is present in the deionized water.

In this technical field, the surface tension of blood is changed, and the blood is rapidly absorbed for the purpose, and the surface of the surface sheet is coated with a surfactant. However, since the surfactant has a high water solubility in general, the surface layer coated with the surfactant is easily mixed with a hydrophilic component (plasma, etc.) in the blood, in other words, has a function of retaining blood in the surface sheet. Propensity. Since the above-mentioned blood modifying agent has a low water solubility, it is different from the conventionally known surfactant, and the blood does not remain in the surface layer sheet, and can be quickly moved to the absorber.

In the present specification, the solubility in 100 g of water at 25 ° C is sometimes referred to only as "water solubility".

The above blood modifying agent may have a water solubility of about 0 g. Therefore, for the above 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 structures.

(i) hydrocarbons, (ii) intercalating at least one carbonyl bond (-CO-) and/or at least one ether bond (-O-) between the CC single bonds of the hydrocarbon, or (iii) between the CC single bonds of the hydrocarbon, a compound in which at least one carbonyl bond (-CO-) and/or at least one ether bond (-O-) is inserted, and at least one hydrogen atom on the hydrocarbon is substituted by a carboxyl group (-COOH) or a hydroxyl group (-OH) .

In the present specification, the term "hydrocarbon" means a compound composed of carbon and hydrogen, and examples of the chain hydrocarbon include a paraffin-based hydrocarbon (which does not contain a double bond and a ginseng bond, also referred to as an alkane), and an olefin-based hydrocarbon (containing one). a double bond, also known as an olefin), an acetylene hydrocarbon (containing one olefin, also known as an alkyne), and a hydrocarbon containing two or more bonds selected from the group consisting of a double bond and a bond, and a ring Examples of the hydrocarbons include aromatic hydrocarbons and alicyclic hydrocarbons.

As the hydrocarbon, a chain hydrocarbon or an alicyclic hydrocarbon is preferred, and a chain hydrocarbon is preferred, and a paraffinic hydrocarbon, an olefin hydrocarbon, and a hydrocarbon having two or more double bonds (having no reference) are used. More preferred, and paraffinic hydrocarbons are preferred.

The chain hydrocarbons contain a linear hydrocarbon and a branched hydrocarbon.

When two or more ether bonds (-O-) are inserted into the compounds of the above (ii) and (iii), the ether bonds (-O-) are not adjacent to each other. Therefore, the compounds of the above (ii) and (iii) do not contain a compound having a continuous ether bond (so-called peroxide).

Further, in the compound of the above (iii), a compound in which at least one hydrogen atom on a hydrocarbon is substituted by a carboxyl group (-COOH), and a compound in which at least one hydrogen atom on a hydrocarbon is substituted with a hydroxyl group (-OH) is preferred. . As shown in Table 1, the carboxyl group is combined with the metal in the menstrual blood, and the inorganic value 150 is greatly increased. Up to 400 or more, the blood modifying agent having a carboxyl group rises to an IOB value of about 0.6 at the time of use, and the affinity with the blood cell may be lowered.

The above blood modifying agent is preferably a compound having the following structure.

(i') a hydrocarbon, (ii') inserted between at least one carbonyl bond (-CO-), at least one ester bond (-COO-), and at least one carbonate bond (-OCOO) between hydrocarbon single bonds of hydrocarbons -) and / or at least one ether bond (-O-) compound, or (iii') between the hydrocarbon CC single bond, inserted 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 derived from a carboxyl group (-COOH) or a hydroxyl group (-OH) Substituted compound.

For the compounds of the above (ii') and (iii'), when two or more bonds are inserted, the insertion is selected from a carbonyl bond (-CO-), an ester bond (-COO-), and a carbonate bond (-OCOO). -) When two or more bonds of the ether bond (-O-) are bonded, the bonds are not adjacent to each other, and at least one carbon atom is interposed between the bonds.

More preferably, the above-mentioned blood modifying agent has a carbonyl bond (-CO-) of about 1.8 or less per 10 carbon atoms, an ester bond (-COO-) of 2 or less, and a carbonate bond (-OCOO-) of about 1.5. The following are compounds having an ether bond (-O-) of about 6 or less, a carboxyl group (-COOH) of about 0.8 or less, or a hydroxyl group (-OH) of about 1.2 or less.

More preferably, the blood modifying agent is (A) an ester of a compound having 2 to 4 hydroxyl groups and a compound having one carboxyl group, (B) an ether having a compound having 2 to 4 hydroxyl groups and an ether having a hydroxyl group, (C) an ester of a compound having 2 to 4 carboxyl groups and a compound having 1 hydroxyl group, and (D) a hydrocarbon insertion selected from a carbonyl bond (-CO-), an ester bond (-COO-), a carbonate bond (- a compound of one of OCOO-) and an ether bond (-O-), (E) a poly C ₃ -C ₆ alkanediol, or an alkyl ester or alkyl ether thereof, or (F) a chain hydrocarbon .

The following explains (A) to (F) in detail.

[(A) an ester of a compound having 2 to 4 hydroxyl groups and a compound having 1 carboxyl group]

(A) an ester having a compound having 2 to 4 hydroxyl groups and an ester having a compound having one carboxyl group (hereinafter sometimes referred to as "compound (A)"), and a compound having 4, 3 or 2 hydroxyl groups and An ester having a compound having one carboxyl group, the above IOB is only in a range having a melting point and a water solubility, and all of the hydroxyl groups need not be esterified.

As the compound having the above 2 to 4 hydroxyl groups, for example, a chain hydrocarbon tetraol, such as an alkanetetraol, such as pentaerythritol, a chain hydrocarbon triol, such as an alkane triol such as glycerin, and a chain hydrocarbon diol such as an alkane Alcohols such as glycols are exemplified. As the compound having the above one carboxyl group, for example, a compound in which one hydrogen atom on a hydrocarbon is substituted by one carboxyl group (-COOH), For example, fatty acids can be mentioned.

Examples of the compound (A) include an ester of (A ₁ ) chain hydrocarbon tetraol and a fatty acid, an ester of (A ₂ ) chain hydrocarbon triol and a fatty acid, and (A ₃ ) a chain hydrocarbon diol and a fatty acid. Ester.

[(A ₁ ) ester of chain hydrocarbon tetraol with fatty acid]

As the ester of the above chain hydrocarbon tetraol and a fatty acid, for example, the following formula (1): Pentaerythritol and a tetraester of a fatty acid, the following formula (2): a pentaerythritol and a fatty acid triester, the following formula (3): a diester of pentaerythritol and a fatty acid, the following formula (4): The monoester of pentaerythritol and a fatty acid can be mentioned. (wherein, 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 the pentaerythritol and the fatty acid, the ester of pentaerythritol and a fatty acid may be a component satisfying the above IOB, melting point, and water solubility, and There is no particular limitation, such as a saturated fatty acid such as a C ₂ - C ₃₀ saturated fatty acid such as acetic acid (C ₂ ) (C ₂ represents a carbon number, which is equivalent to a carbon of R ¹ C, R ² C, R ³ C or R ⁴ C Number, the same below), propane acid (C ₃ ), butanoic acid (C ₄ ) and isomers thereof, such as 2-methylpropanic acid (C ₄ ), pentanoic acid (C ₅ ) and isomers thereof For example, 2-methylbutanoic acid (C ₅ ), 2,2-dimethylpropane acid (C ₅ ), hexane acid (C ₆ ), heptanoic acid (C ₇ ), octanoic acid (C ₈ And its isomers, such as 2-ethylhexane acid (C ₈ ), decanoic acid (C ₉ ), decanoic acid (C ₁₀ ), dodecanoic acid (C ₁₂ ), tetradecanoic acid ( C ₁₄ ), palmitic acid (C ₁₆ ), heptadecanoic acid (C ₁₇ ), octadecanoic acid (C ₁₈ ), icosonic acid (C ₂₀ ), behenic acid (C ₂₂ ), twenty Tetraacid (C ₂₄ ), hexadecanoic acid (C ₂₆ ), octadecanoic acid (C ₂₈ ), tridecanoic acid (C ₃₀ ), and the like, and these isomers (excluding the above) may be mentioned.

The above fatty acid may be an unsaturated fatty acid. As the above unsaturated fatty acid, for example, a C ₃ - C ₂₀ unsaturated fatty acid such as a monounsaturated fatty acid such as crotonic acid (C ₄ ), myristic acid (C ₁₄ ), palmitoleic acid (C ₁₆ ), oleic acid ( C ₁₈ ), oleic acid (C ₁₈ ), octadecenoic acid (C ₁₈ ), oleic acid (C ₂₀ ), eicosaenoic acid (C ₂₀ ), etc., diunsaturated fatty acids, such as linoleic acid (C ₁₈ ), eicosadienoic acid (C ₂₀ ), etc., triunsaturated fatty acids, such as linolenic acid, such as α-linolenic acid (C ₁₈ ) and γ-linolenic acid (C ₁₈ ), pine acid (C) ₁₈ ), tung oil, such as α-tricoleic acid (C ₁₈ ) and β-tricoleic acid (C ₁₈ ), mead (C ₂₀ ), dihomo-γ-linolenic acid (C ₂₀ ), eicosatrienoic acid (C _20), etc., tetrakis unsaturated fatty acids such as stearidonic acid (C _20), arachidonic acid (C _20), arachidonic acid (C _20), etc., five unsaturated fatty acids, e.g. Examples of the eicosatetraenoic acid (C ₁₈ ), eicosapentaenoic acid (C ₂₀ ), and the like, and some of the hydrogen adducts thereof may be mentioned.

As the ester of the pentaerythritol and the fatty acid, it is preferable to use 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, in consideration of modification by oxidation or the like.

Further, as the ester of the pentaerythritol and the fatty acid, the IOB is required to be smaller and more hydrophobic, and a diester, a triester or a tetraester is preferred, a triester or a tetraester is preferred, and a tetraester is preferred.

In the tetraester of the pentaerythritol and the fatty acid, the total number of carbon atoms of the fatty acid constituting the tetraester of pentaerythritol and the fatty acid, that is, the carbon number of the R ¹ C, R ² C, R ³ C and R ⁴ C portions of the above formula (1) The total IOB is 0.60 at 15 o'clock. Therefore, in the tetraester of pentaerythritol and fatty acid, when the total number of carbon atoms is about 15 or more, the requirement of IOB of about 0 to about 0.6 is satisfied.

Among the above tetraesters of pentaerythritol and fatty acids, for example, pentaerythritol, hexane acid (C ₆ ), heptanoic acid (C ₇ ), octanoic acid (C ₈ ), such as 2-ethylhexane acid (C ₈ ), A tetraester of decanoic acid (C ₉ ), decanoic acid (C ₁₀ ) and/or dodecanoic acid (C ₁₂ ) may be mentioned.

In the above-mentioned pentaerythritol and fatty acid triester, the total number of carbon atoms of the fatty acid constituting the trimer of the pentaerythritol and the fatty acid is 19, when the carbon number of the R ¹ C, R ² C and R ³ C portions is 19 in total. The IOB became 0.58. Therefore, in the above-mentioned pentaerythritol and fatty acid triester, when the total carbon number of the fatty acid is about 19 or more, the requirement of IOB of about 0 to about 0.6 is satisfied.

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

The monoester of the pentaerythritol and the fatty acid constitutes the fatty acid carbon number of the pentaerythritol and the monoester of the fatty acid, that is, for the above formula (4), when the carbon number of the R ¹ C moiety is 25, the IOB is 0.60. Therefore, in the monoester of the pentaerythritol and the fatty acid, when the carbon number of the fatty acid is about 25 or more, the requirement of IOB of about 0 to about 0.6 is satisfied.

And for the above calculations, the effects of double bonds, reference keys, iso branches, and tert branches are not considered.

As a commercial product of the above-mentioned ester of pentaerythritol and a fatty acid, Unistar H-408BRS, H-2408BRS-22 (mixed product), etc. (above, manufactured by Nippon Oil Co., Ltd.) can be mentioned.

[(A ₂ ) chain hydrocarbon triol and ester of fatty acid]

As the ester of the above chain hydrocarbon triol and a fatty acid, for example, the following formula (5): Glycerol and fatty acid triester, the following formula (6): The diester of glycerol and fatty acid, and the following formula (7): (In the formula, R ⁵ to R ^{7 are} each a chain hydrocarbon), a monoester of glycerin and a fatty acid may be mentioned.

The fatty acid (R ⁵ COOH, R ⁶ COOH, and R ⁷ COOH) constituting the ester of the glycerin and the fatty acid, and the ester of the glycerin and the fatty acid are only required to satisfy the requirements of the above IOB, the melting point, and the water solubility, and are not particularly limited. For example, the fatty acids listed in "(A ₁ ) chain hydrocarbon tetraol and fatty acid esters", that is, saturated fatty acids and unsaturated fatty acids, may be exemplified by saturated fatty acids in consideration of the possibility of modification by oxidation or the like. The ester of glycerol and a fatty acid, that is, an ester of glycerin and a saturated fatty acid is preferred.

Further, as the ester of glycerin and a fatty acid, when it is desired to make IOB smaller and more hydrophobic, a diester or a triester is preferred, and a triester is preferred.

The above triglycerides of glycerol and fatty acid are also known as triglycerides, such as triesters of glycerol and octanoic acid (C ₈ ), triesters of glycerol and decanoic acid (C ₁₀ ), glycerol and dodecanoic acid (C ₁₂ ) Triesters, and glycerides and triesters of two or three kinds of fatty acids, and mixtures thereof may be mentioned.

As the triester of the above glycerin and two or more kinds of fatty acids, for example, a triester of glycerin and octanoic acid (C ₈ ) and decanoic acid (C ₁₀ ), glycerin and octanoic acid (C ₈ ), and decanoic acid (C) ₁₀ ) and tridecanoic acid (C ₁₂ ) triester, glycerol and octanoic acid (C ₈ ), decanoic acid (C ₁₀ ), dodecanoic acid (C ₁₂ ), tetradecanoic acid (C ₁₄ ) Examples of the triester of palmitic acid (C ₁₆ ) and octadecanoic acid (C ₁₈ ) include the following.

The triglyceride of the glycerin and the fatty acid is such that the melting point is about 45° C. or less, and the carbon number of the fatty acid constituting the triester of glycerin and the fatty acid is total, that is, R ⁵ C, R ⁶ C and R ⁷ C in the formula (5). A part of the total carbon number is preferably about 40 or less.

Further, in the triglyceride of the glycerin and the fatty acid, the carbon number of the fatty acid constituting the triester of glycerin and the fatty acid is total, that is, the total number of carbon atoms of the R ⁵ C, R ⁶ C and R ⁷ C portions in the formula (5) is 12 The IOB becomes 0.60. Therefore, in the above-mentioned triglyceride of glycerin and fatty acid, when the total carbon number of the fatty acid is about 12 or more, the requirement of IOB of about 0 to about 0.6 is satisfied.

The above-mentioned triglyceride of glycerin and fatty acid is a so-called fat, and since it is a component which constitutes a human body, it is preferable from a viewpoint of safety.

As a commercial product of the above-mentioned triglyceride of glycerin and fatty acid, there are three coconut oil fatty acid glycerides, NA36, Panaseate 800, Panasate 800B, and Panasate 810S, and three C2L oil fatty acid glycerides and tri-CL oil fatty acid glycerides (above by Nippon Oil Co., Ltd.) ) can be cited.

The above diglycerides of glycerol and fatty acid are also called diglycerides, such as diesters of glycerol and decanoic acid (C ₁₀ ), diesters of glycerol and dodecanoic acid (C ₁₂ ), glycerol and palmitic acid (C _The diester of ₁₆ ), the diester of glycerin and two kinds of fatty acids, and a mixture thereof may be mentioned.

In the diester of the glycerin and the fatty acid, the carbon number of the fatty acid constituting the diester of glycerin and the fatty acid is a total of, that is, for the formula (6), when the total carbon number of the R ⁵ C and R ⁶ C moieties is 16, the IOB is 0.58. Therefore, in the diester of the glycerin and the fatty acid, when the total carbon number of the fatty acid is about 16 or more, the requirement of IOB of about 0 to about 0.6 is satisfied.

The monoester of the above glycerin and a fatty acid is also called a monoglyceride, for example, a octadecanoic acid (C ₁₈ ) monoester of glycerin, a behenic acid (C ₂₂ ) monoester of glycerin, etc. are mentioned.

In the monoester of the glycerin and the fatty acid, the carbon number of the fatty acid constituting the monoester of glycerin and the fatty acid, that is, for the formula (7), when the carbon number of the R ⁵ C moiety is 19, the IOB is 0.59. Therefore, in the monoester of the above glycerin and fatty acid, when the carbon number of the fatty acid is about 19 or more, the requirement of IOB of about 0 to about 0.6 is satisfied.

[(A ₃ ) ester of chain hydrocarbon diol and fatty acid]

As the ester of the above chain hydrocarbon diol and a fatty acid, for example, a C ₂ -C ₆ chain hydrocarbon diol, such as a C ₂ -C ₆ glycol, such as ethylene glycol, propylene glycol, butylene glycol, pentanediol or Monoesters or diesters of hexanediol and fatty acids are exemplified.

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 of 2 to 6, and R ⁸ and R ^{9 is} each a chain hydrocarbon; a diester of a C ₂ -C ₆ glycol and a fatty acid, and the following formula (9): R ⁸ COOC _k H _2k OH (9) (wherein k is an integer of 2-6) A monoester of a C ₂ -C ₆ glycol and a fatty acid in which R ⁸ is a chain hydrocarbon) may be mentioned.

Among the above-mentioned esters of C ₂ -C ₆ glycol and fatty acid, as a fatty acid which must be esterified (corresponding to R ⁸ COOH and R ⁹ COOH for formula (8) and formula (9)), if C ₂ ~ C ₆ The ester of an alcohol and a fatty acid may satisfy the above requirements of the IOB, the melting point and the water solubility, and is not particularly limited. For example, the fatty acid listed in the "(A ₁ ) chain hydrocarbon tetraol and fatty acid ester", that is, a saturated fatty acid The unsaturated fatty acid is preferably a saturated fatty acid in consideration of the possibility of modification by oxidation or the like.

In the diester of the butanediol (k=4) and the fatty acid represented by the formula (8), when the total carbon number of the R ⁸ C and R ⁹ C moieties is 6, the IOB is 0.6. Therefore, in the diester of the butanediol (k=4) represented by the formula (8) and the diester of the fatty acid, when the total carbon number is about 6 or more, the requirement that the IOB is from about 0 to about 0.6 is satisfied. Further, in the monoester of ethylene glycol (k=2) and the fatty acid represented by the formula (9), when the carbon number of the R ⁸ C moiety is 12, the IOB is 0.57. Therefore, in the monoester of the ethylene glycol (k=2) and the fatty acid represented by the formula (9), when the carbon number of the fatty acid is about 12 or more, the requirement of IOB of from about 0 to about 0.6 is satisfied.

Examples of the C ₂ ~ C ₆ glycol esters of fatty acids and, considering the possibility of modification performed by oxidation and other saturated fatty acids from C ₂ ~ C ₆ glycol ester of a fatty acid, i.e., C ₂ ~ C ₆ Glycol and saturated fatty acid esters are preferred.

Further, as the ester of the C ₂ -C ₆ glycol and the fatty acid, when the IOB is to be made smaller and further hydrophobic, the ester of the glycol having a large carbon number and the fatty acid, for example, from butanediol, An ester of a glycol or a fatty acid of pentanediol or hexanediol is preferred.

Further, as the ester of the C ₂ -C ₆ glycol and the fatty acid, when the IOB is to be made smaller to make it more hydrophobic, it is preferred to use a diester.

Commercial products such as compole BL and combole BS (manufactured by Nippon Oil Co., Ltd.) and the like are exemplified as the commercial products of the above-mentioned esters of C ₂ to C ₆ glycols and fatty acids.

[(B) an ether having a compound having 2 to 4 hydroxyl groups and a compound having 1 hydroxyl group]

(B) a compound having 2 to 4 hydroxyl groups and an ether having a compound having one hydroxyl group (hereinafter sometimes referred to as "compound (B)") contains a compound having 4, 3 or 2 hydroxyl groups and having The ether of one hydroxy compound has only the above-mentioned range of IOB, melting point and water solubility, and all of the hydroxyl groups may not be etherified.

Examples of the compound having the above 2 to 4 hydroxyl groups include those of the "compound (A)", such as pentaerythritol, glycerin, and glycol.

As the above compound having one hydroxyl group, for example, a compound in which one hydrogen atom of a hydrocarbon may be substituted by one hydroxyl group (-OH), for example, an aliphatic monohydric alcohol, such as a saturated aliphatic monohydric alcohol and an unsaturated aliphatic monohydric alcohol Alcohol Out.

The saturated aliphatic monohydric alcohol, for example, a C ₁ to C ₂₀ saturated aliphatic monohydric alcohol, for example, methyl alcohol (C ₁ ) (C ₁ represents a carbon number, the same applies hereinafter), ethyl alcohol (C ₂ ), Propyl alcohol (C ₃ ) and isomers thereof, such as isopropyl alcohol (C ₃ ), butyl alcohol (C ₄ ) and isomers thereof, such as sec-butyl alcohol (C ₄ ) and tert-butyl Alcohol (C ₄ ), pentyl alcohol (C ₅ ), hexyl alcohol (C ₆ ), heptyl alcohol (C ₇ ), octyl alcohol (C ₈ ) and isomers thereof, such as 2-ethylhexyl alcohol (C _8), nonyl alcohol (C _9), decyl alcohol (C _10), dodecyl alcohol (C _12), tetradecyl alcohol (C _14), cetyl (C _16), Heptadecyl alcohol (C ₁₇ ), stearyl alcohol (C ₁₈ ), and eicosyl alcohol (C ₂₀ ), and the isomers not enumerated thereof may be mentioned.

In the unsaturated aliphatic monohydric alcohol, one of the CC single bonds of the saturated aliphatic monohydric alcohol is replaced by a C=C double bond, and examples of the oleyl alcohol include, for example, a new Japanese physicochemical company. The purchased Riker series and the An Jieke series.

As the compound (B), for example, an ether of a (B ₁ ) chain hydrocarbon tetraol and an aliphatic monohydric alcohol, for example, a monoether, a diether, a triether, and a tetraether, preferably a diether, a triether, and a tetraether, More preferably, it is a triether and a tetraether, and most preferably an ether of a tetraether, a (B ₂ ) chain hydrocarbon triol and an aliphatic monohydric alcohol, such as a monoether, a diether and a triether, preferably a diether and The triether, more preferably a triether, and an ether of a (B ₃ ) chain hydrocarbon diol and an aliphatic monohydric alcohol, such as a monoether and a diether, and preferably a diether may be mentioned.

As the ether of the chain hydrocarbon tetraol and the aliphatic monohydric alcohol, for example, the following formulas (10) to (13): (In the formula, R ¹⁰ to R ^{13 are} each a chain hydrocarbon), pentaerythritol of an aliphatic monohydric alcohol, a triether, a diether, and a monoether are mentioned.

As the ether of the above chain hydrocarbon triol and the aliphatic monohydric alcohol, for example, the following formulas (14) to (16): The glycerol of the formula (wherein R ¹⁴ to R ^{16 are} each a chain hydrocarbon) and the triether, diether and monoether of the aliphatic monohydric alcohol are exemplified.

The ether of the chain hydrocarbon diol and the aliphatic monohydric alcohol has the following formula (17): R ¹⁷ OC _n H _2n OR ¹⁸ (17) (wherein n is an integer of 2 to 6, and R ¹⁷ and R ^{18 is} each a chain hydrocarbon; a diether of a C ₁ -C ₆ glycol and an aliphatic monohydric alcohol; and the following formula (18): R ¹⁷ OC _n H _2n OH (18) (wherein n is 2 A monoether of C ₂ -C ₆ -glycol and an aliphatic monohydric alcohol of an integer of ~6 and R ¹⁷ is a chain hydrocarbon) may be mentioned.

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

In the triether of the pentaerythritol and the aliphatic monohydric alcohol, the carbon number of the aliphatic monohydric alcohol constituting the triether of the pentaerythritol and the aliphatic monohydric alcohol, that is, R ¹⁰ , R ¹¹ and R for the above formula (11) ^The total carbon number of the ¹² parts is 9 when the IOB becomes 0.57. Therefore, when the total number of carbon atoms of the aliphatic monohydric alcohol in the above-mentioned pentaerythritol and the aliphatic trihydric alcohol is about 9 or more, the requirement of IOB of about 0 to about 0.6 is satisfied.

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

In the monoether of the pentaerythritol and the aliphatic monohydric alcohol, the carbon number of the aliphatic monohydric alcohol constituting the monoether of the pentaerythritol and the aliphatic monohydric alcohol, that is, the carbon number of the R ¹⁰ moiety in the above formula (13) is 22 The IOB becomes 0.59. Therefore, in the monoether of the above pentaerythritol and the aliphatic monohydric alcohol, when the carbon number of the aliphatic monohydric alcohol is about 22 or more, the requirement of IOB of from about 0 to about 0.6 is satisfied.

Further, in the triether of the glycerin and the aliphatic monohydric alcohol, the carbon number of the aliphatic monohydric alcohol constituting the triether of the glycerin and the aliphatic monohydric alcohol is a total of the formula (14), R ¹⁴ and R ¹⁵ and When the total carbon number of the R ¹⁶ portion is 3, the IOB becomes 0.50. Therefore, when the total carbon number of the aliphatic monohydric alcohol in the triglyceride of the aliphatic glycerol and the aliphatic monohydric alcohol is about 3 or more, the requirement of IOB of about 0 to about 0.6 is satisfied.

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

In the monoether of the glycerin and the aliphatic monohydric alcohol, the carbon number of the aliphatic monohydric alcohol constituting the monoether of glycerin and the aliphatic monohydric alcohol, that is, when the carbon number of the R ¹⁴ moiety is 16 for the formula (16) The IOB became 0.58. Therefore, in the monoether of the above glycerin and the aliphatic monohydric alcohol, when the carbon number of the aliphatic monohydric alcohol is about 16 or more, the requirement of IOB of from about 0 to about 0.6 is satisfied.

In the diether of the butanediol (n=4) represented by the formula (17) and the diester of the aliphatic monohydric alcohol, when the total carbon number of the R ¹⁷ and R ¹⁸ moieties is 2, the IOB is 0.33. Therefore, in the diether of the butanediol (n=4) represented by the formula (17) and the diester of the aliphatic monohydric alcohol, when the total carbon number of the aliphatic monohydric alcohol is 2 or more, the requirement of the IOB of about 0 to about 0.6 is satisfied. . Further, in the monoether of ethylene glycol (n = 2) represented by the formula (18) and the aliphatic monohydric alcohol, when the carbon number of the R ¹⁷ moiety is 8, the IOB is 0.60. Therefore, in the monoether of ethylene glycol (n=2) represented by the formula (18) and the aliphatic monohydric alcohol, when the carbon number of the aliphatic monohydric alcohol is about 8 or more, the requirement of IOB of from about 0 to about 0.6 is satisfied.

The compound (B) can be produced by dehydrating and condensing a compound having 2 to 4 hydroxyl groups and a compound having one hydroxyl group such as an aliphatic monohydric alcohol in the presence of an acid catalyst.

[(C) an ester of a compound having 2 to 4 carboxyl groups and a compound having 1 hydroxyl group]

(C) an ester having a compound having 2 to 4 carboxyl groups and an ester having a compound having one hydroxyl group (hereinafter sometimes referred to as "compound (C)") and a compound having 4, 3 or 2 carboxyl groups; An ester of a compound having one hydroxyl group is only in the range of the above IOB, melting point and water solubility, and all of the carboxyl groups need not be esterified.

As the compound having the above 2 to 4 carboxyl groups, for example, a chain hydrocarbon having 2 to 4 carboxyl groups, for example, a chain hydrocarbon dicarboxylic acid such as an alkanedicarboxylic acid such as ethanedioic acid, propane diacid, butane 2 Acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, octanedioic acid, decanedioic acid and decanedioic acid, chain hydrocarbon tricarboxylic acid, such as an alkanetricarboxylic acid, such as propane tricarboxylic acid, Butane triacid, pentane tricarboxylic acid, hexane tricarboxylic acid, heptane triacid, octane tricarboxylic acid, decane tricarboxylic acid and decane tricarboxylic acid, and chain hydrocarbon tetracarboxylic acid, such as an alkane tetracarboxylic acid, for example Butane tetracarboxylic acid, pentanetetracarboxylic acid, hexanetetracarboxylic acid, heptanetetracarboxylic acid, octane tetracarboxylic acid, decanetetracarboxylic acid, and decanetetracarboxylic acid are exemplified.

Further, the compound having the above 2 to 4 carboxyl groups contains a hydroxy acid having 2 to 4 carboxyl groups, and examples thereof include malic acid, tartaric acid, citric acid, isocitric acid, and the like, and an alkoxy group having 2 to 4 carboxyl groups. Examples of the acid, for example, O-acetyl citric acid, and a carboxylic acid having 2 to 4 carboxyl groups.

As the compound having one hydroxyl group, those listed in the item of "compound (B)", for example, an aliphatic monohydric alcohol can be mentioned.

As the compound (C), (C ₁ ) is a chain hydrocarbon tetracarboxylic acid having four carboxyl groups, a hydroxy acid, an alkoxy acid or an ester of a carboxylic acid and an aliphatic monohydric alcohol, such as a monoester, a diester or a triester. a tetraester, preferably a diester, a triester and a tetraester, more preferably a triester and a tetraester, more preferably a tetraester, (C ₂ ) a chain hydrocarbon tricarboxylic acid having three carboxyl groups, a hydroxy acid, An alkoxy acid or an ester of a carboxylic acid with an aliphatic monohydric alcohol, such as a monoester, a diester or a triester, preferably a diester and a triester, more preferably a triester, and (C ₃ ) has two carboxyl groups. The ester of a chain hydrocarbon dicarboxylic acid, a hydroxy acid, an alkoxy acid or a carboxylic acid with an aliphatic monohydric alcohol, for example, a monoester or a diester, is preferably a diester.

Examples of the compound (C) include dioctyl adipate, diisostearyl malate, tributyl citrate, and tributyl butyl acetoate, which are commercially available.

[(D) in the hydrocarbon insertion of 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-) Compound]

(D) inserting into the hydrocarbon a group selected from the group consisting of an ether bond (-O-), a carbonyl bond (-CO-), an ester bond (-COO-), and a carbonate bond (-OCOO-) One compound (hereinafter sometimes referred to as "compound (D)"), (D ₁ ) an aliphatic monohydric alcohol and an aliphatic monohydric alcohol ether, (D ₂ ) dialkyl ketone, (D ₃ ) fatty acid The ester with an aliphatic monohydric alcohol and the (D ₄ ) dialkyl carbonate are mentioned.

[(D ₁ ) an ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol]

The ether of the aliphatic monohydric alcohol and the aliphatic monohydric alcohol has the following formula (19): R ¹⁹ OR ²⁰ (19) (wherein R ¹⁹ and R ^{20 are} each a chain hydrocarbon) The compound is exemplified.

The aliphatic monohydric alcohol constituting the ether (corresponding to R ¹⁹ OH and R ²⁰ OH in the formula (19)), the ether is not particularly limited as long as it satisfies the requirements of the above IOB, melting point and water solubility. For example, the aliphatic monohydric alcohols listed in the item of "compound (B)" can be mentioned.

In the ether of the aliphatic monohydric alcohol and the aliphatic monohydric alcohol, the total number of carbon atoms of the aliphatic monohydric alcohol constituting the ether is that when the total number of carbon atoms in the R ¹⁹ and R ²⁰ moieties is 2 in the above formula (19) Since the IOB becomes 0.50, the above IOB requirement can be satisfied if the total number of carbon atoms is about 2 or more. However, the total carbon number is about 6 and the water solubility is about 2 g, which is also problematic from the viewpoint of vapor pressure. When the water solubility is required to satisfy the requirements of about 0.05 g or less, it is preferred that the total carbon number is about 8 or more.

[(D ₂ ) dialkyl ketone]

The dialkyl ketone has the following formula (20): R ²¹ COR ²² (20) (wherein each of R ²¹ and R ²² is an alkyl group) is exemplified.

In the above dialkyl ketone, when the total number of carbon atoms of R ²¹ and R ²² is 5 and the IOB is 0.54, the total number of carbon atoms is about 5 or more, which satisfies the requirements of the above IOB. However, in the total of the above carbon numbers, the water solubility is a high value of about 2 g. Therefore, in order to satisfy the requirement of water solubility of about 0.05 g or less, it is preferred that the total carbon number is about 8 or more. Further, in consideration of the vapor pressure, the carbon number is preferably about 10 or more, and about 12 or more is preferable.

Further, when the total carbon number 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.

The above-mentioned dialkyl ketone can be obtained by, for example, a known method, for example, acidifying a second-stage alcohol with chromic acid or the like.

[(D ₃ ) ester of fatty acid with aliphatic monohydric alcohol]

The ester of the above-mentioned fatty acid and the aliphatic monohydric alcohol may, for example, be a compound of the following formula (21): R ²³ COOR ²⁴ (21) (wherein each of R ²³ and R ²⁴ is a chain hydrocarbon).

The fatty acid constituting the above-mentioned ester (corresponding to R ²³ COOH in the formula (21)), for example, the fatty acid listed in the "(A ₁ ) chain hydrocarbon tetraol and fatty acid ester", that is, a saturated fatty acid or an unsaturated fatty acid It is preferable to use a saturated fatty acid in consideration of the possibility of modification by oxidation or the like. The aliphatic monohydric alcohol constituting the above-mentioned ester (corresponding to R ²⁴ OH for the formula (21)), for example, the aliphatic monohydric alcohol listed in the item of the "compound (B)" can be mentioned.

Further, in the ester of the fatty acid and the aliphatic monohydric alcohol, the carbon number of the fatty acid and the aliphatic monohydric alcohol is the total, that is, for the formula (21), the total number of carbons of the R ²³ C and R ²⁴ portions is 5 when the IOB is In the ester of the above fatty acid and the aliphatic monohydric alcohol, the total number of carbon atoms in the R ²³ C and R ²⁴ moieties is about 5 or more, and the above-mentioned IOB requirement is satisfied. However, for example, in the above-mentioned butyl acetate having a total carbon number of 6, the vapor pressure exceeds a high value of 2000 Pa. Therefore, in consideration of the vapor pressure, it is preferred that the total carbon number is about 12 or more. Further, if the total carbon number is about 11 or more, the requirement of water solubility of about 0.05 g or less can be satisfied.

As an example of the ester of the above fatty acid and an aliphatic monohydric alcohol, for example, an ester of dodecanoic acid (C ₁₂ ) with lauryl alcohol (C ₁₂ ), tetradecanoic acid (C ₁₄ ) and dodecyl alcohol (C ₁₂₎ esters and the like may be mentioned of, as the selling products of esters of fatty acids with aliphatic monohydric alcohols of, for example, ErekutolWE20, and ErekutolWE40 (as above NOF Co., Ltd.) may be mentioned.

[(D ₄ ) dialkyl carbonate]

The dialkyl carbonate is exemplified by the following formula (22): R ²⁵ OC(=O)OR ²⁶ (22) (wherein each of R ²⁵ and R ²⁶ is an alkyl group).

In the above dialkyl carbonate, when the total carbon number of R ²⁵ and R ²⁶ is 6, the IOB is 0.57, and when the total carbon number of R ²⁵ and R ²⁶ is about 6 or more, the requirement of IOB is satisfied.

When the water solubility is considered, the total carbon number of R ²⁵ and R ²⁶ is preferably about 7 or more, and about 9 or more is preferable.

The above dialkyl carbonates can be synthesized by the reaction of phosgene with an alcohol, the reaction of a chlorinated acid ester with an alcohol or an alcoholate, and the reaction of silver carbonate with an alkyl iodide, in addition to being commercially available.

[(E) Poly C ₂ ~C ₆ alkanediol, or its ester or ether]

As the above-mentioned poly C ₂ -C ₆ alkanediol, or an ester or ether thereof (hereinafter sometimes referred to as compound (E)), (E ₁ ) poly C ₂ -C ₆ alkanediol, (E ₂ ) poly C ₂ ~C ₆ alkanediol and fatty acid ester, (E ₃ ) poly C ₂ ~ C ₆ alkanediol and aliphatic monohydric alcohol ether, (E ₄ ) poly C ₂ ~ C ₆ alkanediol and chain hydrocarbon An ester of a tetracarboxylic acid, a chain hydrocarbon tricarboxylic acid or a chain hydrocarbon dicarboxylic acid, and (E ₅ ) a poly C ₂ -C ₆ alkanediol with a chain hydrocarbon tetraol, a chain hydrocarbon triol, or a chain The ether of a hydrocarbon diol is mentioned. As explained below.

[(E ₁ )Poly C ₂ ~C ₆ alkanediol]

(E ₁ ) The poly C ₂ -C ₆ alkanediol contains not only a homopolymer of a single glycol but also a copolymer of two or more kinds of glycols and a random polymer. Examples of the glycolic acid include a C ₂ -C ₆ alkanediol, that is, ethylene glycol, propylene glycol, butanediol, pentanediol, or hexanediol. As the above-mentioned glycol species, from the viewpoint of reducing the IOB of the poly C ₂ -C ₆ alkanediol, it is preferred to use propylene glycol, butanediol, pentanediol or hexanediol, and butanediol and pentanediol. Or hexylene glycol is preferred.

In the present specification, the "poly C ₂ -C ₆ alkanediol" is a C ₂ -C ₆ alkanediol, which may be selected from the group consisting of ethylene glycol, propylene glycol, butanediol, pentanediol, and hexanediol. Any of a group of homopolymers, 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 -C ₆ alkanediol is a homopolymer, the poly C ₂ -C ₆ alkanediol is represented by the following formula (23): HO-(C _m H _2m O) _n -H (23) .

Further, as a result of the inventors' confirmation, when polyethylene glycol (when the formula (23) corresponds to m=2) is n≧45 (about 2,000 molecular weights), the requirements of the IOB satisfying about 0 to about 0.60 are satisfied. However, even if the molecular weight exceeds 4,000, the water solubility requirement cannot be met. Therefore, considering that (E ₁ ) a poly-C ₂ -C ₆ alkanediol does not contain a homopolymer of ethylene glycol, ethylene glycol as a copolymer with other glycols or a random polymer must be contained in (E) ₁ ) Poly C ₂ ~C ₆ alkanediol.

Therefore, the homopolymer of the formula (23) contains a homopolymer of propylene glycol, butylene glycol, pentanediol or hexanediol.

From the above, it is known that for the formula (23), m is from about 3 to about 6, and from about 4 to about 6 is preferred, and n is 1 or more.

For the above formula (23), the value of n is, for example, an IOB having a poly C ₂ -C ₆ alkanediol of from about 0 to about 0.60, a melting point of about 45 ° C or less, and about 0.05 g or less of 100 g of water for 25 ° C. The value of water solubility.

For example, when the formula (23) is polypropylene glycol (m=3), the IOB is 0.58 at n=12. Therefore, when the formula (23) is polypropylene glycol (m = 3), the requirement of the above IOB is satisfied when m≧ is about 12.

Further, when the formula (21) is polytetramethylene glycol (m = 4), the IOB is 0.57 at n = 7. Therefore, when the formula (23) is polytetramethylene glycol (m=4), the requirement of the above IOB is satisfied when n≧ is about 7.

From the viewpoints of OB, melting point and water solubility, the weight average molecular weight of the poly C _4-6 alkanediol is preferably from about 200 to about 10,000, more preferably from about 250 to about 8,000, and most preferably from about 250 to about A range of 5,000.

Further, from the viewpoints of OB, melting point and water solubility, the weight average molecular weight of the poly C ₃ alkanediol, i.e., polypropylene glycol, is preferably from about 1,000 to about 10,000, more preferably from about 3,000 to about 8,000, and most preferably A range of about 4,000 to about 5,000. When the weight average molecular weight is less than about 1,000, the water solubility is not satisfied, and the weight average molecular weight is larger, and particularly the absorption speed of the absorber and the whiteness of the surface sheet tend to increase.

As a commercial product of the above poly C ₂ -C ₆ alkanediol, for example, You You Lu (trademark) D-1000, D-1200, D-2000, D-3000, D-4000, PB-500, PB-700 PB-1000 and PB-2000 (above are manufactured by Nippon Oil Co., Ltd.) can be cited.

[(E ₂ ) Poly C ₂ ~ C ₆ alkanediol and ester of fatty acid]

As the ester of the poly C ₂ -C ₆ alkanediol and the fatty acid, there is an OH terminal of the poly C ₂ -C ₆ alkanediol described in the item "(E ₁ ) poly C ₂ -C ₆ alkanediol" One or both of the esterified fatty acids, that is, monoesters and diesters may be mentioned.

For the ester of a poly C ₂ -C ₆ alkanediol and a fatty acid, as a fatty acid which must be esterified, for example, a fatty acid listed as "(A ₁ ) chain hydrocarbon tetraol and a fatty acid ester", that is, a saturated fatty acid or not The saturated fatty acid is preferably a saturated fatty acid in consideration of the possibility of modification by oxidation or the like.

A commercially available product of the above-mentioned ester of a poly C ₃ -C ₆ alkanediol and a fatty acid, for example, WILBRIDE cp9 (manufactured by Nippon Oil Co., Ltd.) can be mentioned.

[(E ₃ ) poly C ₂ ~ C ₆ alkanediol and ether of aliphatic monohydric alcohol]

Examples of an ether poly C ₂ ~ C ₆ alkylene glycol and the aliphatic monohydric alcohol, with a "(E ₁₎ a poly C ₂ ~ C ₆ alkylene glycol" is the item described poly C ₂ ~ C ₆ alkanediol One or both of the OH ends may be etherified by an aliphatic monohydric alcohol, and monoethers and diethers may be mentioned.

For the ether of poly C ₂ -C ₆ alkanediol and aliphatic monohydric alcohol, as the aliphatic monohydric alcohol which must be etherified, for example, the aliphatic monohydric alcohol listed in the item "Compound (B)" may be used. Give it.

[(E ₄ ) an ester of a poly C ₂ -C ₆ alkanediol with a chain hydrocarbon tetracarboxylic acid, a chain hydrocarbon tricarboxylic acid or a chain hydrocarbon dicarboxylic acid]

An ester of the above poly C ₂ -C ₆ alkanediol with a chain hydrocarbon tetracarboxylic acid, a chain hydrocarbon tricarboxylic acid or a chain hydrocarbon dicarboxylic acid, as a poly C ₂ -C ₆ alkanediol which must be esterified, there "(E ₁₎ a poly C ₂ ~ C ₆ alkanediol" item of the described poly C ₂ ~ C ₆ alkanediol include. Further, as a chain hydrocarbon dcarboxylic acid, a chain hydrocarbon tricarboxylic acid, and a chain hydrocarbon dicarboxylic acid which are required to be esterified, there is a description of the item "compound (C)".

The ester of the above poly C ₂ -C ₆ alkanediol with a chain hydrocarbon tetracarboxylic acid, a chain hydrocarbon tricarboxylic acid or a chain hydrocarbon dicarboxylic acid may be obtained by a chain hydrocarbon tetracarboxylic acid or a chain, in addition to being commercially available. The hydrocarbon tricarboxylic acid or the chain hydrocarbon dicarboxylic acid is produced by polycondensing a C ₂ -C ₆ alkanediol under known conditions.

[(E ₅ ) poly C ₂ ~ C ₆ alkanediol and chain hydrocarbon tetraol, chain hydrocarbon triol, or ether of chain hydrocarbon diol]

The above-mentioned poly C ₂ -C ₆ alkanediol and a chain hydrocarbon tetraol, a chain hydrocarbon triol, or a chain hydrocarbon diol are contained as a poly C ₂ -C ₆ alkanediol which must be etherified. (E ₁₎ a poly C ₂ ~ C ₆ alkanediol item "of the described poly C ₂ ~ C ₆ alkanediol include. Further, as a chain hydrocarbon tetraol, a chain hydrocarbon triol, and a chain hydrocarbon diol which are required to be etherified, there are items described as "compound (A)", and examples thereof include pentaerythritol, glycerin, and glycol. .

As a commercial product of the above-mentioned poly C ₂ -C ₆ alkanediol and a chain hydrocarbon tetraol, a chain hydrocarbon triol, or a chain hydrocarbon diol, for example, You Lupu (trademark) 5TP-300KB, and excellent You can mention the European road (trademark) TG-3000 and TG-4000 (made by Nippon Oil Co., Ltd.).

Youlupu (trademark) 5TP-300KB is a compound of pentaerythritol 1 mole condensation polymerization propylene glycol 65 moles and ethylene glycol 5 moles, the IOB is 0.39, the melting point is less than 45 ° C, and the water solubility is less than 0.05. g.

Youyou Ou Lu (trademark) TG-3000 is a compound of 50 moles of condensed propylene glycol in glycerol 1 molar. The IOB is 0.42, the melting point is less than 45 ° C, the water solubility is less than 0.05g, and the weight average molecular weight is About 3,000.

Youyou Ou Lu (trademark) TG-4000 is a compound of glycerol 1 mole condensation propylene glycol 70 mole, the IOB is 0.40, the melting point is less than 45 ° C, the water solubility is less than 0.05g, and the weight average molecular weight is about 4,000.

An ether of the above poly C ₂ -C ₆ alkanediol and a chain hydrocarbon tetraol, a chain hydrocarbon triol, or a chain hydrocarbon diol. Further, it can be produced by subjecting a C ₂ -C ₆ alkanediol to polycondensation under a known condition by a chain hydrocarbon tetraol, a chain hydrocarbon triol or a chain hydrocarbon diol.

[(F) chain hydrocarbon]

The above-mentioned chain hydrocarbon has a minerality value of 0, an IOB of 0, and a water solubility of almost 0 g. Therefore, the above-mentioned blood modifying agent can be contained only in a melting point of about 45 ° C or lower. Examples of the chain hydrocarbons include, for example, a (F ₁ ) chain alkane, for example, a linear alkane or a branched alkane. For example, in the case of a linear alkane, when the melting point is about 45° C. or less, the carbon number is substantially 22 or less. By. Further, in consideration of the vapor pressure, it basically contains a carbon number of 13 or more. In the case of a branched alkane, the number of carbon atoms is 22 or more for the same carbon number because the melting point is lower than the case of the linear alkane. As a commercial product of the above-mentioned hydrocarbon, for example, PARLEAM6 (Nippon Oil Co., Ltd.) can be mentioned.

Although the blood modifying agent described above is discussed in detail at the same time as the examples, it is considered to have a mechanism for lowering blood viscosity and surface tension. The menstrual blood absorbed by the absorbent article is compared with the general blood, and contains proteins such as the endometrial wall, and these blood cells have a function as a link, and it is easy to become a state in which the blood cells are in a string. Therefore, the menstrual blood absorbed by the absorbent article tends to be highly viscous. If the surface layer is non-woven, the menstrual blood tends to block between the fibers, and the wearer tends to feel a sticky feeling, and the menstrual sheet surface diffuses on the surface of the surface sheet. Easy to leak.

In the absorbent article disclosed by the present invention, the surface layer sheet contains a blood modifying agent which has a mechanism for lowering blood viscosity and surface tension, and is not easily blocked by menstrual blood between the fibers of the surface layer sheet, and the menstrual blood can rapidly self-surface layer. The sheet moves to the absorber.

Further, in the absorbent article according to the present invention, since the melting point of the blood modifying agent is about 45 ° C or lower, it is liquid or solid at normal temperature (25 ° C), and is in contact with body fluid of about 30 to about 40 ° C. Liquefaction (or liquid), easy to dissolve in body fluids.

Moreover, the blood modifying agent with an IOB of about 0 to about 0.60 has high organicity and is easily buried between the blood cells, so that the blood cells can be stabilized, and the blood cells are not easy. Form a string structure.

The above-mentioned modifier is capable of stabilizing the blood cells and making the blood cells less likely to form a string structure, so that the absorber easily absorbs menstrual blood. For example, in an acrylic high-absorbent polymer, an absorbent article containing SAP, when the menstrual blood is absorbed, the blood cell of the string covers the surface of the SAP, so that the absorption performance of the SAP is not easily exhibited, but it is stabilized. Blood cells can make SAP's absorption performance easy to play. Moreover, the blood modifying agent having high affinity with red blood cells prevents the red blood cells from being damaged due to the protection of the red blood cell membrane.

In the above absorbent article, the surface layer sheet preferably contains the blood modifying agent in an amount of from about 1 to about 30 g/m ² , more preferably from about 2 to about 20 g/m ² , most preferably from about 3 to about 10 g/m ² . The basis weight range. When the basis weight of the blood modifying agent is lower than about 1 g/m ² , the blood reforming effect tends to be insufficient, and if the basis weight of the blood modifying agent is too large, the stickiness during use may increase. tendency.

The method for applying the blood modifying agent is not particularly limited, and may be heated if necessary, for example, by a non-contact coating machine such as a spiral coater, a curtain coater, a spray coater, or a dip coating. Coating by a machine or the like, a contact coater or the like. A non-contact coater is preferred because the droplet-shaped or particulate-shaped modifier can be uniformly dispersed throughout the entire material and does not cause damage to the material. Further, the blood modifying agent may be heated directly at a room temperature or heated to reduce the viscosity, and when it is solid at room temperature, it may be heated to a liquefaction and then coated using a controlled slit HMA gun. The microparticle-shaped blood modifying agent can be applied by increasing the air pressure of the controlled slit HMA gun.

The above blood modifying agent can be applied at the time of producing a surface sheet or coated on a production line for producing an absorbent article. Investment by suppression equipment From the point of view, it is preferable to apply a blood modifying agent to the production line of the absorbent article, and to inhibit the blood modifying agent from falling off and contaminating the production line, in the downstream step of the production line, specifically before sealing the product into each package, Cloth blood modifier is preferred.

The surface sheet may be coated with a hydrophilic agent or may be hydrophilized after mixing. When the original material has hydrophilicity and has an IOB of about 0 to about 0.60, the lipophilic region and the hydrophilic region become sparsely coherent when a highly organic and lipophilic modifier is applied. Thereby, the menstrual blood formed by the hydrophilic component (plasma or the like) and the lipophilic component (such as blood cells) can exhibit a certain absorption performance.

The above blood modifying agent preferably has a weight average molecular weight of about 2,000 or less, and preferably has a weight average molecular weight of 1,000 or less. If the weight average molecular weight becomes high, the viscosity of the blood modifying agent is difficult to fall to a viscosity suitable for coating, and it must be diluted with a solvent. Further, if the number average molecular weight is increased, the blood modifying agent is debonded and causes an uncomfortable feeling to the user.

The back sheet 3 shown in Figs. 1 and 2 is a leakage of body fluid which is prevented from being absorbed by the absorber 4. In the back sheet 3, a material that does not penetrate the body fluid is used. For example, as the back sheet 3, a water-repellent non-woven fabric, a water-impermeable plastic film such as polyethylene or polypropylene, a laminate sheet of a non-woven fabric and a water-impermeable plastic film, or the like is used. Further, it is preferable to use an SMS non-woven fabric in which a melt-resistant nonwoven fabric having a high water resistance is sandwiched by a spunbonded nonwoven fabric having high strength as the back sheet 3. When a material having a gas permeable property that does not pass through a body fluid is used as the back sheet 3, leakage at the time of use can be reduced.

The absorber 4 absorbs body fluid and holds it. The absorbent body 4 is high in volume, and the shape is not easily broken, and it is preferable that the chemical stimulation is less. For example, as the absorbent body 4, a composite absorbent body composed of a fluffy wood pulp or an air laid-laid fiber nonwoven fabric and a superabsorbent polymer (SAP) can be used. The composite absorbent body may be covered with a liquid permeable material such as toilet paper.

Further, in place of the fluffy wood pulp of the composite absorbent body, for example, artificial cellulose fibers such as chemical wood pulp, cellulose fibers, hydrazine, and acetate may be used. The basis weight of the absorbent fiber such as wood pulp in the composite absorbent body 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 body is such that the absorbent fiber is used. When it is 100%, it is preferably 10% or more and 65% or less. The basis weight of the liquid permeable material covering the toilet paper or the like of the composite mixture is preferably 12 g/m ² or more and 30 g/m ² or less.

As the air-laid fiber nonwoven fabric of the above composite composite, for example, a non-woven fabric in which a non-woven fabric or a wood pulp and a synthetic fiber are fixed by a binder is used after heat-melting the wood pulp and the synthetic fiber.

The superabsorbent polymer of the above composite absorbent is a three-dimensional mesh structure having a water-soluble polymer and moderately cross-linking. The absorbent polymer absorbs 30 to 60 times of water for the volume of the absorbent polymer before absorption of water. However, the absorbent polymer is water insoluble in nature. Further, even if the absorbent polymer is applied with a large amount of pressure, the absorbed water does not escape. As the absorbent polymer, for example, a starch-based, acrylic or amino acid-based particulate or fibrous polymer is used.

The shape and structure of the absorber may be changed as necessary, and the absorber 4 The total absorption amount must correspond to the design insertion amount and the intended use of the absorbent article 1. Further, the size, absorption capacity, and the like of the absorber 4 vary depending on the application.

The wing portion 5 is provided in the absorbent article 1 in order to securely fix the absorbent article 1 to the undergarment. After the wing portion 5 is folded on the outer side of the undergarment, the adhesive portion 6 is attached to the crotch portion of the underwear to securely fix the absorbent article 1 to the undergarment.

The adhesive portion 6 is for fixing the absorbent article 1 to the crotch portion of the undergarment. As the adhesive for forming the adhesive portion 6, for example, any one of a styrene-based polymer, an adhesion-imparting agent, and a plasticizer can be used as a main component. Examples of the styrene-based polymer include a styrene-ethylene-butylene-styrene block copolymer, a styrene-butene polymer, a styrene-butene-styrene block copolymer, and a styrene-isobutylene. - A styrene copolymer or the like may be used alone or in combination of two or more kinds of polymers. Among them, a styrene-ethylene-butylene-styrene block copolymer is preferred from the viewpoint of good heat stability.

Further, as the adhesion-imparting agent and the plasticizer, it is preferred to use a solid organic compound at normal temperature. Examples of the adhesion-imparting agent include a C5-based petroleum resin, a C9-based petroleum resin, a dicyclopentadiene-based petroleum resin, a rosin-based petroleum resin, a polydecene resin, a terpene phenol resin, and the like, and a plasticizer, for example, Examples of the monomer plasticizer such as tricresyl phosphate, dibutyl phthalate or dioctyl phthalate include an ethylene polymer or a polymer plasticizer such as polyester.

By bonding the surface sheet 2 by hot embossing to the back sheet 3. The sealing portion 7 is formed on both sides in the longitudinal direction of the absorbent article 1.

Next, a method of manufacturing the surface sheet 2A of the absorbent article 1 according to the first embodiment of the present invention will be described with reference to Fig. 4 . 4 is an explanatory view of a surface sheet manufacturing apparatus 100A used in the method of manufacturing the surface sheet 2A in the first embodiment of the present invention. The top sheet manufacturing apparatus 100A includes a concave forming roll 120A, an extending tooth roll 130, and a slip coating spray 140. Moreover, the manufacturing method of the surface sheet 2A is a process of preparing a resin film, a recess formation process, a gear extension process, and a slip coating process.

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

In the recess forming step, the heated resin film 102A (see FIG. 8(a)) is passed through the concave portion forming roller 120A to manufacture the resin film 103A forming the concave portion 104A (see FIG. 8(b)). The recess forming roller 120A is formed by a knurling roller 121A and a preheating roller 122A having a smooth surface.

5(a) and 5(b) are views showing an example of the knurling roller 121A. Fig. 5(a) shows a whole view of the knurling roll 121A, and Fig. 5(b) shows the knurling roll 121A which is engaged with the resin film 102A when the resin film 102A passes between the knurling roll 121A and the roll 122A having a smooth surface. An enlarged view of the portion 123A of the surface. Fig. 5(c) shows an example of a preheating roll 122A having a smooth surface. A lattice-like convex portion 124A is provided on the surface 123A of the knurling roller 121A. Thereby, a rhombic recess 125A is formed on the surface of the knurling roller 121A.

For the lattice-like convex portions 124A, among the parallel parallel convex portions 124A The pitch of the core line, that is, the pitch of the lattice-like convex portion 124A is preferably 0.2 mm or more and 10 mm or less, more preferably 0.4 mm or more and 2 mm or less. When the distance between the lattice-like convex portions 124A is less than 0.2 mm or larger than 10 mm, the concave portion is not formed in the resin film. Further, the width of the lattice-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, more preferably 0.2 mm or more and 1 mm or less. When the width of the lattice-like convex portion 124A is less than 0.01 mm, or is larger than 1 mm, or the length of one side of the rhombic concave portion 125A is less than 0.1 mm, or is larger than 5 mm, a concave portion is not formed in the resin film.

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

When the resin film 102A passes between the knurling roll 121A and the roll 122A having a smooth surface, the resin film 102A is pressed in the thickness direction at a portion in contact with the lattice-like convex portion 124A, and has a slightly rectangular shape as shown in Fig. 8(b). The recess 104A is formed in the resin film 102A. Further, the shape of the concave portion 125A of the knurling roll 121A is not limited to a rhombic shape, and may be a square, a rectangle, a parallelogram, a trapezoid, a triangle, a hexagon, or the like.

In the gear extending step, the resin film 105A forming the ridge portion 21A and the opening portion 25A is formed by the resin film 103A having the concave portion formed by extending the tooth roll 130 as shown in FIG. 4 (see FIG. 8(c)). Fig. 6(a) is a view showing the upper tooth roll 131 of the extending tooth roll 130. 6(b) is an illustration of the gear teeth 133 disposed on the outer peripheral surface of the upper tooth roll 131 Figure. The gear teeth 133 extend in the circumferential direction of the upper tooth roll 131. When the resin film 103A (see FIG. 8(b)) extends the tooth roll 130, the resin film 103A is prevented from being cut by the angle of the gear teeth 133, and the corners of the gear teeth 133 are chamfered into an R shape.

The width of the gear teeth 133 is, for example, 0.3 to 0.5 mm, and the distance between the adjacent gear teeth 133 is, for example, 1.0 to 1.2 mm. Further, since the lower stage tooth roll 132 of the tooth roll 130 has the same shape as the upper stage tooth roll 131, the detailed description of the lower stage tooth roll 132 will be omitted. The length in the radial direction of the upper-stage toothed roller 131 in the portion where the gear teeth 133 of the upper-stage toothed roller 131 and the gear teeth of the lower-stage toothed roller 132 are engaged, that is, the bite depth, is, for example, 1.25 mm. The gap between the gear teeth 133 of the upper tooth roll 131 and the gear teeth of the lower tooth roll 132 when the gear teeth 133 of the upper tooth roll 131 and the gear teeth of the lower tooth roll 132 are engaged is, for example, 0.25 to 0.45 mm.

When the resin film 103A is extended by the tooth roll 130, the resin film 103A is bent in a slight wave shape, and the resin film 105A which forms the ridge part 21A is manufactured (refer FIG. 8 (c).

Next, the principle in which the opening portion 25A is formed in the resin film 103A when the extending tooth roll 130 passes through the resin film 103A will be described with reference to FIG. Moreover, the principle does not limit the invention.

The resin film 103A is extended largely at the meshing portion 106A of the gear teeth 133 of the upper-stage toothed roller 131 and the gear teeth 134 of the lower-stage toothed roller 132. In the concave portion forming step, the portion where the concave portion 104A is formed is a portion where the weight of the resin film 103A changes rapidly, so that the strength is weak, and the concave portion 104A of the resin film 103A is broken if it is extended. Therefore, the resin film In the extended portion 106A of the 103A, the concave portion 104A of the resin film 103A is broken, and the broken portion of the resin film 103A is expanded to form the opening portion 25A.

The resin film 103A is such that the portion 107A where the gear teeth 133 of the upper-stage toothed roller 131 and the gear teeth 134 of the lower-stage toothed roller 132 are not engaged does not extend. Therefore, in the resin film 103A, the gear teeth 133 of the upper-stage toothed roller 131 and the gear teeth 134 of the lower-stage toothed roller 132 are unengaged portions 107A, and even if the resin film 103A passes through the extending tooth roll 130, the concave portion forming step is formed. The recess 104A is not broken and does not become an opening. Therefore, the concave portion 104A formed in the concave portion forming step becomes the concave portion 26A of the surface sheet 2 which is slightly extended.

The gear teeth 133 of the upper stage tooth roll 131 of the resin film 103A and the gear teeth 134 of the lower stage tooth roll 132 are the unengaged parts 107A, and correspond to the top 23A and the bottom part 22A of the ridge portion 21A of the surface sheet 2A (see FIG. 3). The meshing portion 106A of the gear teeth 133 of the upper roller 130 of the resin film 103A and the gear teeth 134 of the lower roller 132 corresponds to the wall portion 24A of the ridge portion 21A of the surface sheet 2A (refer to FIG. 3). Therefore, the top portion 23A and the bottom portion 22A of the ridge portion 21A of the surface sheet 2A are provided with the concave portion 26A, and the wall portion 24A of the ridge portion 21A of the surface sheet 2A is provided with the opening portion 25A.

When the resin film for the surface sheet 2A is extended, the concealing property is weakened due to thinning. Therefore, when the absorbent article 1 is viewed from above the skin side, the body fluid absorbed by the absorbent body 4 is hidden in the bottom portion 22A of the surface sheet 2A and the top portion 23A of the protruding portion 21A, and is not visible, but the absorbent material is not absorbed. When the product 1 is viewed from a slope, the wall portion 24A of the ridge portion 21A of the surface sheet 2A and the opening portion 25A of the wall portion 24A see the body fluid absorbed by the absorber 2. Therefore, when the exchange period of the absorbent article 1 is to be judged, the amount of body fluid absorbed by the absorbent body 4 can be confirmed when the absorbent article 1 is viewed from a slope, whereby the exchange period of the absorbent article 1 can be determined.

In the slip coating step, the above-mentioned slip agent 141 is applied to the gear-extending resin film 105A using the slip coating spray 140 to the resin film 108A which is formed on the surface to form the slip layer 27A (Fig. 8(d) Reference). The coating amount of the lubricant to 0.1g / m ² or more, 30.0g / m ² or less preferably to 1.0g / m ² or more, 10.0g / m ² or less is preferred. When the amount of the slip agent applied is less than 0.1 g/m ² , the wiping effect of the body fluid by the slip agent cannot be produced. When the coating amount of the slip agent is more than 30.0 g/m ² , the surface of the surface sheet 2A causes the user to have a moist touch.

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 of the absorbent article corresponding to the region where the user's body fluid is discharged. Further, in the step of applying the lubricant, when the spray is applied by using the slip coating spray 140, the lubricant 141 is applied to the resin film 105A, but the lubricant 141 may be applied by a printing method, a dipping method, or the like. The resin film 105A. The production conditions of the surface sheet are as follows, for example.

Resin film material: low density polyethylene (LDPE)

The basis weight of the resin film: 23.5 g/m ² or 35.0 g/m ²

Thickness of resin film: 20μm or 30μm

Titanium oxide content in the resin film: 2.9% or 5%

Preheating roller temperature: 80 ° C

The distance between the lattice-like convex parts of the knurling roller: 0.4mm

Gear tooth width: 0.5mm

Distance between adjacent gear teeth: 1.0mm

The gap between the gear teeth of the upper toothed roller and the gear teeth of the lower toothed roller: 0.25mm

The nip depth of the extended tooth roller: 1.25mm

The lattice-like convex portion 124A and the rhombic concave portion 125A provided on the surface of the knurling roller are as shown in Fig. 9(a).

The concave portion 104A formed by the concave portion forming roller 120A on the resin film is as shown in Fig. 9(b). The length of the width direction (CD) of the recess 104A is 0.25 mm. The pitch of the width direction (CD) of the concave portion 104A is 0.70 mm. Here, the distance between the width directions of the concave portions 104A is the distance between the right ends of the concave portions 104A adjacent to each other in the lateral direction of FIG. 9(b).

The opening portion 25A formed by the extending tooth roll 130A on the wall portion 24A of the ridge portion and the concave portion 26 formed on the top portion 23A of the ridge portion are as shown in Fig. 9(c). Further, Fig. 9(c) shows a resin film which is stretched and bent to a slightly corrugated shape when the entire resin film is to be focused on the microscope.

- Second embodiment -

The second embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited to those described in the drawings. In the case where there is a common portion in the first embodiment of the present invention, a common symbol is given, and a portion different from the first embodiment of the present invention will be described.

The absorbent article according to the second embodiment of the present invention is the same as the absorbent article 1 of the first embodiment except for the surface sheet. Therefore, the surface sheet of the absorbent article according to the second embodiment will be mainly described.

Fig. 10 is a schematic perspective view showing a surface sheet 2B of the absorbent article according to the second embodiment. The surface sheet 2B which is curved in a slightly wavy shape in the width direction is a bottom portion 22B which is disposed between the ridge portion 21B extending in the longitudinal direction and the adjacent ridge portion 21B. Further, the extension of the ridge portion 21B is not limited to the longitudinal direction. The ridge portion 21B has a top portion 23B that contacts the skin of the user and a wall portion 24B on the side surface. In the surface sheet 2B of the absorbent article of the second embodiment, the cross-section of the surface sheet 2B is also slightly undulated, so that when the user wipes the body fluid such as menstrual blood with a toilet paper or the like, the surface layer 2B is applied by the pressure on the surface of the surface sheet 2B. The slightly wavy shape is deformed, the surface sheet 2B becomes flat, and the body fluid adhering to the surface sheet 2B becomes easy to wipe.

The top sheet 2B is a resin layer 31B including a plurality of openings 34B to be permeated through the body fluid, a slip layer 33B provided on the skin side of the resin film layer 31B, and a fiber set provided on the garment side of the resin film layer 31B. Layer 32B. The fiber assembly layer 32B is broken by the substrate to the wall portion 24B of the ridge portion 21B. Here, the substrate breakage B is the destruction of the fiber assembly layer 32B generated inside the fiber assembly layer such as the fiber assembly layer 32B.

Since the resin used for the resin film layer 31B is the same as the surface sheet of the absorbent article of the first embodiment, the description of the resin used as the resin film layer 31B will be omitted.

The basis weight of the resin film layer 31B is preferably 1 g/m ² or more, more preferably 30 g/m ² or less, still more preferably 3 g/m ² or more and 15 g/m ² or less. Further, 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 concealability of the surface sheet 2B will be too small, and if the thickness of the resin film layer 31B exceeds 0.3 mm, the rigidity of the surface sheet 2B will become high, and the skin of the user will be high. The stimulation of the surface sheet 2B will be too strong. When the thickness of the resin film layer 31B exceeds 0.3 mm, the strength of the resin film layer 31B is too high, and the opening portion 34B cannot be formed in the resin film layer 31B.

The surface sheet 2B is the same as the surface layer sheet 2 of the absorbent article according to the first embodiment, and the body fluid absorbed by the absorbent body is not visible from the outside, and therefore has concealability. The concealability of the surface sheet 2 is caused by the concealability of the resin film layer 31. The concealability of the resin film layer 31 is produced by mixing an inorganic filler such as titanium oxide in the resin. When the filler is titanium oxide, the content of the 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 the titanium oxide is less than 1% by weight of the resin, the concealing effect of the body fluid absorbed by the absorber in the surface layer sheet 2B is too small. When the content of the titanium oxide exceeds 50% by weight of the resin film, the resin containing titanium oxide may be difficult to form into a layer.

In the wall portion 24B of the surface sheet 2B, the resin film layer 31B has a plurality of parallel openings 34B in the extending direction (long direction) of the ridge portion 21B. The opening portion 34B is a hole penetrating through the resin film layer 31B, and the body fluid of the user passes through the opening portion 34B, is absorbed in the fiber assembly layer 32B, and is absorbed in the absorber. The opening area of the opening portion 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. The opening area of the opening portion 34B when the ratio of 0.0005mm ² hours, and the wearer's body fluid may not pass through the opening portion 34B, 34B upon the opening area of the opening portion ² is large when the ratio of 1.5mm, the absorber absorbing body fluids by In the opening portion 34B of the resin film layer 31B, the area ratio of the portion other than the opening portion 34B of the resin film layer 31B is reduced, and the concealability of the surface sheet 2B is reduced. When the opening area of the opening 34B of the resin film layer 31B is larger than 1.5 mm ² , the strength of the surface sheet 2B becomes smaller.

The ratio of the total opening area of 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 aperture ratio of the resin film layer 31B is less than 1%, the permeability of the body fluid in the surface layer sheet 2B is deteriorated, and when the aperture ratio of the resin film layer 31B is larger than 10%, the body fluid absorbed by the absorber passes through the resin film. When the opening 34B of the layer 31B flows back, the area ratio of the portion other than the opening 34B of the resin film layer 31B is reduced, and the concealability of the surface sheet 2B is reduced. Moreover, when the aperture ratio of the resin film layer 31B is larger than 10%, the strength of the surface sheet 2B is too small.

The fiber assembly layer 32B is a paper containing a collection of hydrophilic fibers, a nonwoven fabric, or the like. The nonwoven fabric used as the fiber assembly layer 32B is preferably toilet paper. In addition, the toilet paper is a thin leaf paper which has a wet strength of 10 g/m ² or more and 20 g/m ² or less as a main component, such as kraft pulp or crepe. 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 32B can impart hydrophilicity to the surface layer sheet 2B. Further, the fiber assembly layer 32B imparts flexibility to the surface sheet 2B. When the toilet paper is used for the fiber assembly layer 32B, the toilet paper is relatively inexpensive compared with other papers and non-woven fabrics, and can be easily purchased in many cycles on the market. Moreover, although the strength of the toilet paper is low, when the resin film layer 31B is used at the same time, the toilet paper as the fiber assembly layer 32B of the top sheet 2B can be used. Further, since the toilet paper is easily broken by the base material, the opening portion 34B can be easily formed in the resin film layer 31B by the gear extending step described later.

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

Next, a method of manufacturing a surface sheet according to a second embodiment of the present invention will be described with reference to Fig. 11 . FIG. 11 is an explanatory view of the surface sheet manufacturing apparatus 100B used in the method of manufacturing the surface sheet 2B in the second embodiment of the present invention. The surface sheet manufacturing apparatus 100B includes an extension tooth roll 130 and a lubricant application spray 140. Further, the method for producing the surface sheet 2B is a step of including a composite sheet prepared by a resin film layer and a fiber assembly layer, a gear stretching step, and a slip coating step.

In the step of preparing the composite sheet formed of the resin film layer and the fiber assembly layer, the composite sheet 103B supplied from the roll of the composite sheet (not shown) is supplied to the extension tooth roll 130. The composite sheet 103B is produced by, for example, pressing a resin sheet such as a toilet paper sheet (a sheet of a toilet paper sheet) into a laminate, and forming a resin film layer on the fiber sheet.

In the gear extending step, the extension sheet 130 is passed through the composite sheet 103 to form a ridge portion on the composite sheet 103, and an opening portion is formed in the resin film layer of the composite sheet. The extension tooth roll used in the gear extension step is the same as the gear extension roll 130 used in the method of manufacturing the surface layer sheet of the absorbent article according to the first embodiment, and therefore the description of the gear extension roller will be omitted.

When the composite sheet 103B is extended by the tooth roll 130, the composite sheet 103B is bent in a slightly wavy shape and extends in the machine direction, and a plurality of ridge portions juxtaposed in the width direction are formed on the composite sheet 103B.

Next, a principle in which the resin film layer of the composite sheet 103B is formed into an opening portion when the extending tooth roll 130 passes through the resin film 103B will be described with reference to FIG. Moreover, the principle does not limit the invention.

The composite sheet 103B is extended by a portion 105B in which the gear teeth 133 of the upper-stage toothed rolls 131 are engaged with the gear teeth 134 of the lower-stage toothed rolls 132.

The fiber assembly layer is easily broken by the substrate, and the tensile strength of the fiber assembly layer is relatively low for the tensile strength of the resin film layer. When the composite sheet 103B is stretched until the fiber assembly layer is broken by the substrate, the resin film layer integrated in the portion where the tissue layer is broken by the substrate is also destroyed, and the opening is formed in the resin film layer.

In detail, the surface of the fiber assembly layer has low smoothness, and small irregularities are formed on the surface of the fiber assembly layer. Therefore, a stronger portion and a weaker portion of the adhesion force between the resin film layer and the fiber assembly layer are produced. The resin film layer having a strong adhesion to the fiber assembly layer is such that the resin film layer and the fiber assembly layer are integrated when the composite sheet 103B is stretched until the fiber assembly layer is broken by the substrate. Substrate destruction Together they are broken to form an opening. However, the resin film layer having a weaker adhesion to the fiber assembly layer is such that when the stretched composite sheet 103B is broken until the fiber assembly layer is broken by the substrate, the fiber assembly layer is released by the fiber assembly layer. The state of leaving. As a result, the portion of the resin film layer having a weak adhesion to the fiber assembly layer is not broken together with the substrate damage of the fiber assembly layer. Therefore, the opening of the resin film layer in the portion where the adhesion to the fiber assembly layer is weak is not formed. On the surface of the fiber assembly layer, an irregular large-sized opening portion is formed in the resin film layer due to irregularities formed as irregularities.

The composite sheet 103B is such that the portion 106B where the gear teeth 133 of the upper-stage toothed roller 131 and the gear teeth 134 of the lower-stage toothed roller 132 are not engaged does not extend. Therefore, in the composite sheet 103B, the gear teeth 133 of the upper-stage toothed roller 131 and the gear teeth 134 of the lower-stage toothed roller 132 are unengaged portions 106B, and even if the composite sheet 103B passes the extending toothed roller 130, the opening portion is not formed.

The gear teeth 133 of the upper tooth roll 131 of the composite sheet 103B and the gear teeth 134 of the lower stage tooth roll 132 are unengaged portions 106B corresponding to the top portion 23B and the bottom portion 22B of the ridge portion 21B of the surface sheet 2B (see FIG. 10). The gear teeth 133 of the upper tooth roll 131 of the composite sheet 103B and the meshing portion 105B of the gear teeth 134 of the lower stage tooth roll 132 correspond to the wall portion 24B of the ridge portion 21B of the surface layer sheet 2B (refer to FIG. 10). Therefore, the top portion 23B and the bottom portion 22B of the protruding portion 21B of the surface sheet 2B have no opening portion 34B, and the opening portion 34B is provided in the wall portion 24B of the protruding portion 21B of the surface sheet 2B.

A microscope photograph of the skin side of the surface sheet in which the opening portion is formed in the resin film layer is shown in Fig. 13 . Fig. 13 (a) shows a skin side micrograph of a surface sheet in which a plurality of openings are arranged in the extending direction of the ridge portion. Fig. 13 (b) shows a skin side micrograph of the surface sheet of the wall portion having the ridge portion of the opening. Fig. 13 (c) is a micrograph showing the skin side of the surface sheet of the opening of the film resin layer.

A microscope photograph of the garment side of the surface sheet in which the opening of the resin film layer is formed is shown in Fig. 14 . Fig. 14 (a) shows a coating side microscope photograph of a fiber assembly layer broken by a substrate and a surface layer sheet of a resin film layer forming an opening. Fig. 14 (b) shows a photograph on the garment side of the surface sheet of the fiber covering layer which is covered by the opening of the resin film layer.

In the slip coating step, the slip agent 141 is applied to the side surface of the resin film layer of the gear-extending composite sheet 104B by using the slip coating spray 140, and a slip layer is formed on the composite sheet 104B. The coating amount of the lubricant is the same as the coating amount of the lubricant in the method for producing a surface sheet of the absorbent article according to the first embodiment.

Further, in the method for producing the surface sheet 2B described above, instead of preparing the composite sheet formed of the resin film layer and the fiber assembly layer, a step of preparing the fiber sheet may be provided, and the resin may be used as a laminate for the fiber sheet. A step of forming a composite film by forming a resin film layer on the sheet.

The absorbent article according to the first embodiment and the absorbent article according to the second embodiment can be modified as follows.

(1) The resin film formed of the lubricant layer is formed on at least a part of the skin side surface of the surface sheet, and the surface layer of the absorbent article according to the first embodiment is on the skin side. The resin film 2A on which the lubricant layer 27A is formed, or the skin side of the surface sheet 2B of the absorbent article according to the second embodiment may or may not be a resin which forms the lubricant layer 33B on the skin side surface. The film 31B can be used. For example, in the surface sheet of the absorbent article, as the surface sheet 2C shown in Fig. 15, a slip layer 33C may be formed on the skin side surface of the strip-like resin film layer 31C on the skin side surface of the non-woven fabric or toilet paper 32C. Figure 15 is a partially enlarged perspective view of the top sheet 2C. At this time, since the lubricant layer 33C exists between the user's body fluid and the resin film layer 31C, the wiping property of the body fluid is good. Further, the body fluid adhering to the non-woven fabric or the toilet paper 31C passes through the non-woven fabric or the toilet paper 31C and is absorbed in the absorbent body, so that wiping is not required.

The width of the striped resin film layer 31C is, for example, 0.05 to 3 mm, preferably 0.1 to 1 mm. Further, the distance between the adjacent resin film layers 31C is, for example, 0.05 to 3 mm, preferably 0.1 to 1 mm. In the stripe-shaped resin film layer 31C, for example, a resin containing polyethylene as a main component and a base material such as a nonwoven fabric are continuously applied in a stripe shape, and then pressure is applied in a thickness direction by a pinch roll to form a nonwoven fabric or the like.

A lubricant layer 27D as shown in Fig. 16 (b) can be formed on the surface of the surface sheet 2D of the resin film described in Patent Document 1 shown in Fig. 16 (a). Fig. 16 (a) and (b) are perspective views showing a partially enlarged mode of the surface sheet 2D. The hair-like fibers 21D are formed on the surface of the surface sheet 2D described in Patent Document 1. Therefore, due to the multiple fibers 21D will Since the body fluid remains, it is difficult to wipe the body fluid from the surface sheet 2D. Moreover, the hair-like fibers 21D are used for the purpose of damage to toilet paper or the like for wiping body fluids. However, since the lubricant layer 27D is formed on the surface of the surface sheet 2D, it is possible to suppress the residual body fluid between the plurality of fibers 21D, and the body fluid adhering to the surface sheet 2D can be easily wiped off. Further, since it is easy to wipe the body fluid, it is necessary to make the surface sheet 2D strong by using toilet paper or the like, so that it is possible to suppress breakage of the toilet paper or the like used when the body fluid is wiped.

Further, the surface sheet 2E of the hair-like fiber is not formed on the surface of the surface sheet of the resin film described in Patent Document 1 (see FIG. 17), that is, the surface of the surface sheet 2E on which only the opening portion 25E is formed can form a lubricant layer. 27E. Figure 17 is a partially enlarged perspective view of the top sheet 2E.

(2) The surface sheet and the absorbent body may not be joined at least in the opposite region of the user's body fluid discharge port. At this time, the surface layer of the surface sheet at least in the opposing portion of the body fluid discharge port of the user is formed on the skin side surface by a resin film forming a lubricant layer. Thereby, the surface sheet is easily deformed, and the body fluid such as menstrual blood remaining on the surface of the surface sheet can be more easily wiped. In particular, when the surface sheet is bent into a slightly wavy shape, when the user wipes the body fluid with toilet paper or the like, the surface of the surface sheet is deformed by the pressure applied to the surface of the surface sheet, and the surface sheet is more likely to change. Flat. Thereby, the body fluid attached to the surface of the surface sheet can be wiped more easily.

[Examples]

The present invention will be described in detail below based on the embodiments, but the present invention does not. This embodiment is limited.

(wiping property)

For the examples and comparative examples, the wiping property of the surface sheet was measured as follows.

(1) A sample was placed on three sheets of overlapping filter paper (100 mm × 100 mm). Three overlapping filter papers correspond to the absorber.

(2) Using a micropipette having an inner diameter of 1.8 mm, a high-viscosity artificial menstrual blood of 0.1 mg was dropped into the sample at a vertical speed of 100 g/min from a height of 10 mm above the sample. The composition of the high-viscosity artificial menstrual blood used at this time is as follows.

Composition of high viscosity artificial menstrual blood

97% by weight of 0.9% physiological saline

3 wt% of tamarind gum (trade name: Glyloid6C, purchased by DSP Wuxie Food & Chemical Co., Ltd.)

Micro Food Color Red No. 102

(3) Place it for 1 minute after dropping.

(4) After the toilet paper was folded in half to make it a size of 110 mm × 60 mm, the folded toilet paper was taken up 6 times in the middle of the hand. The toilet paper was moved by 30 mm on the surface of the sample under the pressure of 100 to 150 g/cm ² , and the high-viscosity artificial menstrual blood dripped was wiped with a toilet paper.

(5) The mass of the sample after wiping was measured, and the mass of the sample before dropping the high-viscosity artificial menstrual blood was subtracted from the measured mass, and the residual amount of the high-viscosity artificial menstrual blood remaining in the sample was calculated.

The production methods of the examples and comparative examples will be described below.

(Example 1)

A resin film made of 97% by weight of polyethylene and 3% by weight of titanium oxide was formed into a hole by punching. The resin film forming the pores had a weight per unit area of 22 g/m ² , a substantial opening diameter of 0.5 to 0.8 mm, and a substantial opening area ratio (opening ratio) of 18%. ^On the surface of the resin film having a coating amount of 5 g/m ² , triglyceride was coated (trade name: Panaseate 810s (IOB: 0.32, melting point: -5 ° C, degree of hydrolysis: <0.05 g, by Nippon Oil Co., Ltd.) Purchased).

(Example 2)

The surface sheet of Example 2 was produced by the method for producing a surface sheet according to the first embodiment. The production conditions of Example 2 are as follows.

Composition of resin film: 97% by weight of polyethylene, 3% by weight of titanium oxide

The distance between the lattice-like convex parts of the knurling roller: 0.4mm

Gear tooth width: 0.5mm

Gear tooth height: 1.5mm

Distance between adjacent gear teeth: 1.0mm

The gap between the gear teeth of the upper toothed roller and the gear teeth of the lower toothed roller: 0.25mm

The nip depth of the extended tooth roll: 1.1mm

Slip agent: triglyceride (trade name: Panaseate 810s (IOB: 0.32, melting point: -5 ° C, degree of hydrolysis: <0.05 g, purchased by Nippon Oil Co., Ltd.)

Coating amount: 5g / m ² Form of Example 2 as follows.

Height of the ridge: 0.05mm

The distance between the centers of the widths of the adjacent ridges (the distance between the ridges): 2.5 mm

Diameter of the opening: 0.1~0.6mm

Physical 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 micrographs of the surfaces of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Fig. 18. Fig. 18 (a) is a micrograph photographed on the surface of Example 1, and Fig. 18 (b) is a micrograph photographed on the surface of Example 2, and Fig. 18 (c) shows the surface of Comparative Example 1. The microscope photograph, Fig. 18 (d), is a micrograph of the surface of Comparative Example 2.

The results of the wiping test of the examples and comparative examples are as follows.

The surface states of the examples and comparative examples after the high-viscosity artificial menstrual blood was dropped for 1 minute in the examples and comparative examples are shown in FIG. 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 a photograph showing the surface state of Comparative Example 1, and Fig. 19 (d) A photograph showing the surface state of Comparative Example 2.

The surface state of the toilet paper after the high-viscosity artificial menstrual blood was wiped by the examples and the comparative examples is shown in FIG. Fig. 20 (a) is a photograph showing the surface state of the toilet paper after the high-viscosity artificial menstrual blood is wiped by the embodiment 1, and Fig. 20 (b) is a photograph showing the surface state of the toilet paper after the high-viscosity artificial menstrual blood is wiped by the embodiment 2, and Fig. 20 (c) is A photograph of the surface state of the toilet paper after the high-viscosity artificial menstrual blood was wiped by Comparative Example 1, and FIG. 20(d) is a photograph of the surface state of the toilet paper after the high-viscosity artificial menstrual blood was wiped by Comparative Example 2.

The surface states of the examples and comparative examples after wiping high-viscosity artificial menstrual blood using toilet paper are as shown in FIG. Fig. 21 (a) is a photograph showing the surface state of Example 1, Fig. 21 (b) is a photograph showing the surface state of Example 2, Fig. 21 (c) is a photograph showing the surface state of Comparative Example 1, and Fig. 21 (d) is a photograph showing a comparative example. 2 surface status photos.

From the photograph of Fig. 21, compared with the surface of Comparative Example 1, no high-viscosity artificial menstrual blood remained on the surface of Example 1, and it was known on the surface of Example 2 as compared with the surface of Comparative Example 2. No high viscosity artificial menstrual blood remains. Thereby, when the slip agent is applied to the surface sheet, the high-viscosity artificial menstrual blood adhering to the surface sheet can be cleanly wiped.

High viscosity of Example 1 after wiping high viscosity artificial menstrual blood with toilet paper The residual amount of artificial menstrual blood was 0.01 g, and the residual amount of the high-viscosity artificial menstrual blood of Example 2 was 0.00 g, and the residual amount of the high-viscosity artificial menstrual blood of Comparative Example 1 was 0.03 g, and the residue of the high-viscosity artificial menstrual blood of Comparative Example 2 was retained. The amount is 0.02 g. From this, it was found that the slip agent was applied to the surface sheet, and the high-viscosity artificial menstrual blood attached to the surface sheet was cleanly wiped.

Compared with Example 1, Example 2 had less high-viscosity artificial menstrual blood remaining after wiping. When the high-viscosity artificial menstrual blood was wiped with a toilet paper, the surface of Example 2 was deformed by the pressure applied, and the surface of Example 2 was flattened, and the surface adhered to the high-viscosity artificially. It is easy to wipe through blood.

(The mechanism by which blood modifying agents can reduce blood viscosity and surface tension)

The mechanism by which the blood modifying agent has reduced blood viscosity and surface tension is confirmed by the following examples.

〔example 1〕 [Evaluation of the rate of rewet and the migration speed of the absorber]

Prepare physiological cotton for sale of goods. The sanitary tampon is a surface sheet formed of a hot air non-woven fabric (composite fiber made of polyester and polyethylene terephthalate, basis weight: 35 g/m ² ) treated with a hydrophilic agent, Hot air non-woven fabric (composite fiber made of polyester and polyethylene terephthalate, basis weight: 30g/m ² ), second sheet, wood pulp (basis weight: 150~450g/m ² , center A large number of acrylic acid superabsorbent polymers (basis weight: 15g/m ² ) and an absorbent body containing a toilet paper as a central protrusion, a side sheet treated with a water repellent agent, and a back sheet formed of a polyethylene film Formed by.

The blood modifying agents used in the experiments are listed below.

[(A ₁ ) ester of chain hydrocarbon tetraol with fatty acid]

. Yunisuta H-408BRS, manufactured by Nippon Oil Co., Ltd.

Tetrakilyl tetraethyl 4-ethylhexane

. Yunisuta H-2408BRS-22, manufactured by Nippon Oil Co., Ltd.

Mixture of pentaerythritol tetrakis-2-ethylhexane acid and neopentyl glycol di-2-ethylhexane acid (58:42, weight ratio)

[(A ₂ ) chain hydrocarbon triol and ester of fatty acid]

. Cetiol SB45DEO, manufactured by Cognis Japan Co., Ltd.

Fatty acid is glycerol and fatty acid triester of oleic acid or stearyl acid

. Three C2L oil fatty acid glycerides, manufactured by Nippon Oil Co., Ltd.

C ₈ fatty acid: C ₁₀ fatty acid: C ₁₂ fatty acid contains about glycerol and fatty acid triester in a weight ratio of 37:7:56

. Tri-CL oil fatty acid glyceride, manufactured by Nippon Oil Co., Ltd.

C ₈ fatty acid and C ₁₂ fatty acid containing glycerol and fatty acid triester in a weight ratio of 44:56

. Panasate 810s, manufactured by Nippon Oil Co., Ltd.

C ₈ fatty acid: C ₁₀ fatty acid contains about glycerol and fatty acid triester in a weight ratio of 85:15

. Panasate800, manufactured by Nippon Oil Co., Ltd.

Fatty acids are octane acid (C ₈ ) glycerol and fatty acid triester

. Panasate800B, manufactured by Nippon Oil Co., Ltd.

Fatty acids are 2-ethyl hexane acid (C ₈ ) glycerol and fatty acid triester

. NA36, made by Nippon Oil Co., Ltd.

C ₁₆ fatty acid: C ₁₈ fatty acid: C ₂₀ fatty acid (containing both saturated and unsaturated fatty acids) contains about glycerol and fatty acid triester in a weight ratio of 5:92:3.

. Three coconut oil fatty acid glyceride, manufactured by Nippon Oil Co., Ltd.

C ₈ fatty acid: C ₁₀ fatty acid: C ₁₂ fatty acid: C ₁₄ fatty acid: C ₁₆ fatty acid (containing both saturated and unsaturated fatty acids) is contained in a weight ratio of 4:8:60:25:3 Glycerol and fatty acid triester

. SOY42, made by Nippon Oil Co., Ltd.

C ₁₄ fatty acids: C ₁₆ fatty acids: C ₁₈ fatty acids: C ₂₀ fatty acids (containing both saturated and unsaturated fatty acids) containing glycerol and fatty acid triesters in a weight ratio of 0.2:11:88:0.8

. Octanoic acid diglyceride, manufactured by Nippon Oil Co., Ltd.

Fatty acid is a diester of glycerol and fatty acid of octanoic acid

[(A ₃ ) ester of chain hydrocarbon diol and fatty acid]

. compoleBL, made by Nippon Oil Co., Ltd.

Dodecanediol (C ₁₂ ) monoester of butanediol

. compoleBS, made by Nippon Oil Co., Ltd.

Butanediol octadecanoic acid (C ₁₈₎ monoesters

. Yunisuta H-208BRS, made by Nippon Oil Co., Ltd.

Diethyl 2-ethylhexane acid neopentyl glycol

[(C ₃ ) a chain hydrocarbon dicarboxylic acid having two carboxyl groups, a hydroxy acid, an alkoxy acid or an ester of a carboxylic acid and an aliphatic monohydric alcohol]

. Dioctyl adipate, manufactured by Wako Pure Chemical Industries

[(D ₃ ) ester of fatty acid with aliphatic monohydric alcohol]

. Erekutol WE20, manufactured by Nippon Oil Co., Ltd.

Ester of dodecanoic acid (C ₁₂ ) and dodecyl alcohol (C ₁₂ )

. Erekutol WE40, manufactured by Nippon Oil Co., Ltd.

Ester of tetradecanoic acid (C ₁₄ ) and dodecyl alcohol (C ₁₂ )

[(E ₁ )Poly C ₂ ~C ₆ alkanediol]

. Youyou Ou D-1000 (Your Ou Lu is made by Nippon Oil Co., Ltd.)

Polypropylene glycol having a weight average molecular weight of about 1,000

. Youyou Europe Road D-1200

Polypropylene glycol having a weight average molecular weight of about 1,200

. Youyou Europe Road D-3000

Polypropylene glycol having a weight average molecular weight of about 3,000

. Youyou Europe Road D-4000

Polypropylene glycol having a weight average molecular weight of about 4,000

. Youyou Europe Road PB500

Polytetramethylene glycol having a weight average molecular weight of about 500

. Youyou Europe Road PB700

Polyoxybutylene polyoxypropylene glycol having a weight average molecular weight of about 700

. Youyou Europe Road PB1000R

Polytetramethylene glycol having a weight average molecular weight of about 1000

[(E ₂ ) Poly C ₂ ~ C ₆ alkanediol and ester of fatty acid]

. WILBRIDEcp9, made by Nippon Oil Co., Ltd.

The OH groups at both ends are polybutanediol having a weight average molecular weight of about 1,100 by esterification with palmitic acid (C ₁₆ ).

[(E ₃ ) poly C ₂ ~ C ₆ alkanediol and ether of fatty acid]

. You Lupu MS-70K, made by Nippon Oil Co., Ltd.

a stearyl ether of polypropylene glycol, a repeating unit of about 15

[(F ₁ )chain alkane]

. PARLEAM6, manufactured by Nippon Oil Co., Ltd.

Copolymerization of isoparaffin, isobutylene and n-butene, followed by hydrogenation of branched hydrocarbons, degree of polymerization: about 5 to about 10

〔other〕

. NA50, manufactured by Nippon Oil Co., Ltd.

Adding hydrogen to NA36 to reduce the double bond ratio of glycerol and fatty acid from the unsaturated fatty acid of raw materials

. (octanoic acid/capric acid) monoglyceride, manufactured by Nippon Oil Co., Ltd.

Octanoic acid (C ₈ ) and decanoic acid (C ₁₀ ) contain a monoester of glycerol and fatty acid in a weight ratio of 85:15

. Monomuls 90-L2 lauric acid monoglyceride, manufactured by Cognis Japan Co., Ltd.

. Youyou Ux HC60, made by Nippon Oil Co., Ltd.

Polyoxyethylene hardened castor oil

. WILBRIDEs 753, manufactured by Nippon Oil Co., Ltd.

Polyoxyethylene polyoxypropylene polyoxybutylene glycerol

. Isopropyl citrate, Tokyo Chemical Industry Co., Ltd.

. Youyou Europe Road D-400

Polypropylene glycol having a weight average molecular weight of about 400

. Youyou Ou Road TG-330, made by Nippon Oil Co., Ltd.

Glycerol ether of polypropylene glycol, repeating unit of about 6, weight average molecular weight: about 330

. You Youou Road TG-1000, made by Nippon Oil Co., Ltd.

Glycerol ether of polypropylene glycol, repeating unit of about 16, weight average molecular weight: about 1000

. You Lupu DGP-700, made by Nippon Oil Co., Ltd.

Diglycerol ether of polypropylene glycol, repeating unit of about 9, weight average molecular weight: about 700

. PEG1500, made by Nippon Oil Co., Ltd.

Polyethylene glycol having a weight average molecular weight of from about 1,500 to about 1,600

. Non-ionic S-6, manufactured by Nippon Oil Co., Ltd.

Polyoxyethylene monostearate, repeat unit of about 7, weight average molecular weight: about 600

. Vaseline, made by CognisJapan Co., Ltd.

Hydrocarbons, semi-solids from petroleum

The IOB, melting point and water solubility of the above samples are shown in Table 2.

Further, the water solubility was measured by the above method, and 20.0 g of 100 g of desalted water was added, and the sample dissolved after 24 hours was evaluated as "20 g <", and 0.05 g of 100 g of demineralized water was dissolved, but 1.00 g was not dissolved. The sample was evaluated to be 0.05 to 1.00 g.

Further, regarding the melting point, "<45" means that the melting point is less than 45 °C.

The skin contact surface of the surface sheet of the above sanitary napkin is coated with the above blood modifying agent. When each blood modifying agent is liquid at room temperature, the following coating is directly performed. If the blood modifying agent is solid at room temperature, it is heated to a melting point of +20 ° C, and secondly, the control slit HMA is used. The gun was micronized with each blood modifying agent and applied to the skin contact surface of the topsheet to a basis weight of about 5 g/m ² .

For Example 1, the range of the surface layer containing the blood modifying agent is shown in FIG. As shown in Fig. 22, in the example 1, the surface sheet 220 of the sanitary napkin 200 contains almost all of the blood modifying agent, and is a region 240 containing the blood modifying agent. And for Fig. 22, reference numeral 230 denotes a press section.

〔experiment method〕

On the surface sheet containing each blood modifying agent, place an acrylic plate with holes (200mm × 100mm, 125g, open 40mm × 10mm in the center) The hole), from the above hole, will be 37 ± 1 ° C horse EDTA blood (in the horse's blood to prevent coagulation, add ethyldiaminetetraacetic acid (hereinafter referred to as "EDTA")) 3g, using a microdrop The tube was instilled (first time), and after 1 minute, 3 g of horse EDTA blood at 37 ± 1 ° C was dropped from the hole of the acrylic plate and dropped again with a micropipette (second time).

Immediately after the second blood dripping, the acrylic plate was taken out, and 10 pieces of filter paper (50 mm × 35 mm) were placed in the place where the blood was dropped, and a weight was placed thereon to a pressure of 30 g/cm ² . After 1 minute, the filter paper was taken out, and the "reverse bleed rate" was calculated by the following formula.

Infiltration rate (%) = 100 × (quality of filter paper after test - original filter paper quality) / 6 In addition to the evaluation of the rewet rate, the "absorbent migration speed" of the time when the blood moves from the surface sheet to the absorber after the second blood instillation is measured. The absorption speed of the absorbent body indicates the time from when the absorbent body is put into the blood, and the redness of blood is not observed on the surface and inside of the surface sheet.

The results of the rate of rewet and the rate of migration of the absorber are shown in Table 2 below.

Moreover, the whiteness of the skin contact surface of the surface sheet after the test of the migration speed of the absorber was visually evaluated based on the following criteria.

◎: The redness of the blood has almost no residue, and it is impossible to distinguish between the place where the blood exists and the place where it does not exist.

○: Although there are some red blood levels remaining, it is not easy to distinguish between where the blood exists and where it does not exist.

△: There is a redness of some blood remaining, and the place where the blood exists is known.

×: The redness of the blood directly remains

The combined results are shown in Table 2 below.

When there is no blood modifying agent, the re-infiltration rate is 22.7%, and the migration speed of the absorbent body exceeds 60 seconds, the osmosis rate of glycerol and fatty acid triester is 7.0% or less, and the migration speed of the absorbent body is 8 seconds or less. Therefore, it is known that the absorption performance can be greatly improved. However, in the triester of glycerin and fatty acid, the NA50 having a melting point exceeding 45 ° C did not show a significant improvement in the absorption performance.

Similarly, in 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 for 100 g of water at 25 ° C, a large absorption property is known. improve.

Next, after the physiological sanitary napkins of No. 1 to 42 are used by the subjects of the plural volunteers, the physiological sanitary napkins containing the blood modifying agents of No. 1 to 28 are obtained in the surface sheets even after absorption of menstrual blood. There is no sticky feeling, and the surface sheet is also refreshing. In particular, a significant difference was obtained between these and the sanitary napkins of No. 29, 32, 39, 41 and 42.

Further, in the sanitary napkin of No. 1 to 28, in particular, the physiological sanitary napkin containing the blood modifying agent of No. 1 to 11, 15 to 18 and 28 is subjected to skin contact for absorbing surface layer of menstrual blood. The face is not dyed red by the blood, and the answer is less uncomfortable.

[Example 2]

The above-mentioned rewet rate is evaluated for various blood types of animals. The blood used in the experiment is as follows.

[animal species]

(1) Human

(2) Horse

(3) sheep

[blood species]

. Defibration: After blood collection, stir the glass beads in a triangular beaker for about 5 minutes.

. EDTA blood: Add 12% EDTA to venous blood 65mL. 2K physiological saline solution 0.5mL

〔distinguish〕

Serum or plasma: clear liquid after centrifugation of each defibrinated blood or EDTA blood at room temperature for about 10 minutes at about 1900G

Blood cells: The serum was removed from the blood, and the residue was washed twice with phosphate buffered physiological saline solution (PBS), followed by the addition of the removed serum amount of phosphate buffered physiological saline solution.

An absorbent article was produced in the same manner as in Example 1 except that the tri-C2L oil fatty acid glyceride was applied to a basis weight of about 5 g/m ² , and the rewet ratio of each of the above blood was evaluated. The measurement of each blood was performed 3 times, and the average value was used.

The results are shown in Table 3 below.

The same tendency as the horse EDTA blood obtained in Example 1 was also obtained in the blood of humans and sheep. Moreover, the same tendency was observed for defibrinated blood and EDTA blood.

[Example 3] [evaluation of blood retention]

The blood retention of the surface layer containing the blood modifying agent and the surface layer containing no blood modifying agent was evaluated.

〔experiment method〕

(1) Three C2L oil fatty acids on the skin contact surface of a surface sheet formed of hot air non-woven fabric (composite fiber composed of polyester and polyethylene terephthalate, basis weight: 35 g/m ² ) The glyceride was micronized using a controlled slit HMA gun and applied to a basis weight of about 5 g/m ² . Further, for comparison, those who have not applied the tri-C2L oil fatty acid glyceride are prepared. Next, both the surface sheet coated with the tri-C2L oil fatty acid glyceride and the uncoated top sheet were cut into a size of 0.2 g, and the mass (a) of the cell filter + surface sheet was accurately measured.

(2) About 2 mL of horse EDTA blood was added from the skin contact surface side and left to stand for 1 minute.

(3) The cell filter is placed in a centrifuge tube and stopped to remove excess horse EDTA blood.

(4) The weight (b) of the surface layer containing the cell filter + horse EDTA blood was measured.

(5) The initial absorption amount (g) per 1 g of the surface sheet was calculated according to the following formula.

Initial absorption = [weight (b) - weight (a)] / 0.2

(6) The cell filter was again placed in a centrifuge tube, and centrifuged at about 1200 G for 1 minute at room temperature.

(7) The weight (c) of the surface layer containing the cell filter + horse EDTA blood was measured.

(8) The amount of absorbed (g) per 1 g of the surface sheet was calculated according to the following formula.

Absorption after test = [weight (c) - weight (a)] / 0.2

(9) The blood retention rate (%) was calculated according to the following formula.

Blood retention rate (%) = 100 × absorption after test / initial absorption

Further, the measurement was performed three times, and the average value was used.

The results are shown in Table 4 below.

It means that the surface layer containing the blood modifying agent has low blood retention property and can be quickly moved to the absorber after absorbing blood.

[Example 4] [viscosity of blood containing blood modifying agent]

The blood viscosity of the blood modifying agent was measured using a Rheometric Expansion System ARES (Rheometric Scientific, Inc). 2% by mass of Panasate 810s was added to the horse's fiber, and the sample was formed by gently stirring, and the sample was placed on a parallel plate having a diameter of 50 mm, and the interval was set to 100 μm, and the viscosity was measured at 37 ± 0.5 °C. On the parallel plate, the sample was not evenly sheared, but the average shear rate displayed by the machine was 10 s ^-1 .

The viscosity of the horse hair fiber containing 2% by mass of Panasate 810s is 5.9 mPa. s, on the other hand, the viscosity of the horse-defibrinated blood without the blood modifying agent is 50.4 mPa. s. Therefore, the horse defibrinated blood containing 2% by mass of Panasate 810s was found to have a viscosity of about 90% lower than that of the case where no blood modifying agent was contained.

The blood contains components such as blood cells and is known to have thixotropic properties. However, the blood modifying agent disclosed in the present invention can lower the viscosity of blood in a low viscosity region. By lowering the viscosity of the blood, the absorbed menstrual blood can be quickly moved from the surface sheet to the absorber.

Since the blood modifying agent can rapidly move the absorbed menstrual blood from the surface layer to the absorber, the blood modifying agent is added to the horse defibrin blood by 2% by mass, and the measurement is performed at 37 ° C and a shearing speed of 10 s ^-1 . At the viscosity, the viscosity of the above-mentioned horse-drawn fiber blood is preferably reduced to at least 50% compared with that before the addition, at least to 60% is preferred, at least to 70% is better, at least to 80% is the most good.

[Example 5] [Micrograph of blood containing blood modifying agent]

The menstrual blood of healthy volunteers was taken on the cling film, and in one part, the concentration of Panaseate 810s to Panaseate 810s dispersed in 10 times of phosphate buffered physiological saline was added at 1% by mass. The menstrual blood was dripped on the slide, covered with a cover glass, and the state of the red blood cells was observed under a microscope. A microscope photograph of menstrual blood containing no blood modifying agent is shown in Fig. 23(a), and a microscope photograph of menstrual blood containing Panasate 810s is shown in Fig. 23(b).

As seen from Fig. 23, in the menstrual blood containing no blood modifying agent, red blood cells form aggregates such as money strings, but red blood cells are stably dispersed in menstrual blood containing Panasate 810s. Therefore, the blood modifying agent exhibits the function of stabilizing red blood cells in the blood.

[Example 6] [surface tension of blood containing blood modifying agent]

The surface tension of the blood containing the blood modifying agent was measured by a pendant method using a contact angle meter Drop Master 500 manufactured by Kyowa Interface Science Co., Ltd. The surface tension is a blood modifying agent added to the defibrinated blood of the sheep, and is measured after being sufficiently vibrated.

The measurement was performed automatically by a machine, and the density γ was obtained by the following formula (refer to FIG. 24).

γ=g×ρ×(de) ² ×1/H

g: gravity constant

1/H: Correction obtained by ds/de

ρ: density

De: maximum diameter

Ds: the diameter of the position where only de is raised by the drop end

The density ρ is measured at the temperature shown in Table 5 in accordance with the 5. Vibration Density Test Method of "Density Test Method and Density, Mass, Capacity Conversion Table" of JIS K 2249-1995.

The measurement was performed using DA-505 of Kyoto Electronics Industry Co., Ltd.

The results are shown in Table 5 below.

As is apparent from Table 5, the blood modifying agent has a water solubility of 0.05 g or less per 100 g of water at 25 ° C, so the solubility in water is extremely low, but the surface tension of blood can be lowered.

By lowering the surface tension of the blood, the absorbed blood is not held between the fibers of the surface sheet, and can be quickly moved to the absorber.

One of the embodiments and the modifications may be combined with a plurality. The modifications can also be combined with each other in any form.

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

1‧‧‧Absorbables

2A~2E‧‧‧ surface sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

5‧‧‧ wings

6‧‧‧Adhesive

21A, 21B‧‧‧ spurs

22A, 22B‧‧‧ bottom

23A, 23B‧‧‧ top

24A, 24B‧‧‧ wall

25A, 34B‧‧‧ openings

26A‧‧‧ recess

27A, 27D, 27E, 33B, 33C‧‧ ‧ slip layer

100A, 100B‧‧‧ surface sheet manufacturing device

120A‧‧‧recess forming roll

121A‧‧‧Rolling Roll

122A‧‧‧Preheating roller with smooth surface

130‧‧‧Extended tooth roll

131‧‧‧Upper tooth roll

132‧‧‧lower tooth roller

133,134‧‧‧ gear teeth

140‧‧‧Slip coating spray

141‧‧‧Slip agent

Fig. 1 is a partially broken plan view showing 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 A-A of Fig. 1.

Fig. 3 is an explanatory view of a surface sheet of the absorbent article according to the first embodiment of the present invention.

Fig. 4 is a view showing an absorbent article according to a first embodiment of the present invention; An explanatory diagram of a method of producing a surface sheet.

[ Fig. 5] Fig. 5 is an explanatory view of a concave portion forming roller used in the method for producing a surface sheet of the absorbent article according to the first embodiment of the present invention.

[ Fig. 6] Fig. 6 is an explanatory view of an extension tooth roll used in a method of manufacturing a surface sheet of the absorbent article according to the first embodiment of the present invention.

Fig. 7 is an explanatory view of a resin film extended by an extending tooth roll.

[Fig. 8] Fig. 8 is an explanatory view showing a state in which a resin film is changed in each step of the method for producing a surface layer sheet of the absorbent article according to the first embodiment of the present invention.

Fig. 9 is a micrograph of a surface sheet of the absorbent article according to the first embodiment of the present invention.

Fig. 10 is an explanatory view of a surface sheet of the absorbent article according to the second embodiment of the present invention.

[Fig. 11] Fig. 11 is an explanatory view showing a method of manufacturing a surface sheet of an absorbent article according to a second embodiment of the present invention.

Fig. 12 is an explanatory view of a composite sheet extended by an extending tooth roll.

Fig. 13 is a photomicrograph of the skin side of a surface sheet in which an opening portion is formed in a resin film layer.

Fig. 14 is a photomicrograph of a garment side of a surface sheet in which an opening is formed in a resin film layer.

Fig. 15 is an explanatory view showing a modification of the surface layer sheet of the absorbent article of the present invention.

Fig. 16 is an explanatory view showing a modification of the surface layer sheet of the absorbent article of the present invention.

Fig. 17 is an explanatory view showing a modification of the surface sheet of the present invention.

Fig. 18 is a photomicrograph of the surface of the examples and comparative examples after being subjected to shadowing.

Fig. 19 is a photograph showing the surface state of the examples and comparative examples in which the high-viscosity artificial menstrual blood was dropped for 1 minute in the examples and the comparative examples.

Fig. 20 is a photograph showing the state of the surface of the toilet paper after the high-viscosity artificial menstrual blood was wiped by the examples and the comparative examples.

Fig. 21 is a photograph showing the surface state of the examples and comparative examples after the high-viscosity artificial menstrual blood was wiped with a toilet paper.

Fig. 22 is a view showing a range of a surface layer containing 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 an explanatory view showing a method of measuring surface tension.

1‧‧‧Absorbables

2A‧‧‧Skin sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

5‧‧‧ wings

7‧‧‧ Sealing Department

Claims (9)

An absorbent article comprising a liquid-permeable top sheet provided on the skin side, a liquid-impermeable back sheet provided on the garment side, and a liquid retention provided between the surface sheet and the back sheet The absorbent body is characterized in that at least a part of the skin side surface of the surface layer sheet is formed by a resin film having a lubricant layer formed on the skin side surface, and the lubricant layer has water repellency and/or dialing. The lubricating agent of the lubricant layer is a blood modifying agent having an IOB of 0 to 0.60, a melting point of 45 ° C or less, and a water solubility of 0.05 g or less for 100 g of water at 25 ° C. The absorbent article of claim 1, wherein the blood modifying agent is (i) a hydrocarbon, (ii) between the CC single bonds of the hydrocarbon, and at least one carbonyl bond (-CO-) is inserted and/or at least a compound having one ether bond (-O-), or (iii) intercalating at least one carbonyl bond (-CO-) and/or at least one ether bond (-O-) between the CC single bonds of the hydrocarbon, and a compound in which at least one hydrogen atom on a hydrocarbon is substituted by a carboxyl group (-COOH) or a hydroxyl group (-OH); wherein, for a compound of (ii) or (iii), when two or more ether linkages are inserted, the ether linkages do not Adjacent. For example, in the absorbent article of claim 1 or 2, wherein the blood modifying agent is (i') a hydrocarbon, (ii') inserted between at least one carbonyl bond (-CO-), at least one ester bond (-COO-), and at least one carbonate bond (-OCOO) between hydrocarbon single bonds of hydrocarbons -) and / or at least one ether bond (-O-) compound, or (iii') between the hydrocarbon CC single bond, inserted 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 derived from a carboxyl group (-COOH) or a hydroxyl group (-OH) A compound to be substituted; wherein, for a compound of (ii') or (iii'), when two or more bonds are inserted, each bond does not abut. The absorbent article according to claim 1 or 2, wherein the blood modifying agent has a carbonyl bond (-CO-) of 1.8 or less per one carbon atom in the hydrocarbon, and an ester bond (-COO-) Two or less compounds having a carbonate bond (-OCOO-) of 1.5 or less, an ether bond (-O-) of 6 or less, a carboxyl group (-COOH) of 0.8 or less, and/or a hydroxyl group (-OH) of 1.2 or less. The absorbent article according to claim 1 or 2, wherein the blood modifying agent is (A) an ester having a compound having 2 to 4 hydroxyl groups and a compound having one carboxyl group, and (B) having 2~ An ether of a compound having 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, and (D) a hydrocarbon insertion selected from an ether bond (-O- a compound of any one of the group consisting of a carbonyl bond (-CO-), an ester bond (-COO-), and a carbonate bond (-OCOO-), (E) a poly C ₂ -C ₆ alkanediol, Or its ester or ether or (F) chain hydrocarbon. The absorbent article according to claim 1 or 2, wherein the blood modifying agent is an ester selected from the group consisting of (A ₁ ) chain hydrocarbon tetraol and fatty acid, (A ₂ ) chain hydrocarbon triol and fatty acid Ester, (A ₃ ) chain hydrocarbon diol and fatty acid ester, (B ₁ ) chain hydrocarbon tetraol and aliphatic monohydric alcohol ether, (B ₂ ) chain hydrocarbon triol and aliphatic monohydric alcohol Ether, (B ₃ ) chain hydrocarbon diol and aliphatic monohydric alcohol ether, (C ₁ ) chain hydrocarbon tetracarboxylic acid having 4 carboxyl groups, hydroxy acid, alkoxy acid or carboxylic acid and aliphatic 1 An ester of a diol, (C ₂ ) a chain hydrocarbon tricarboxylic acid having three carboxyl groups, a hydroxy acid, an alkoxy acid or an ester of a carboxylic acid and an aliphatic monohydric alcohol, and (C ₃ ) having a chain of two carboxyl groups a hydrocarbon dicarboxylic acid, a hydroxy acid, an alkoxy acid or an ester of a carboxylic acid and an aliphatic monohydric alcohol, (D ₁ ) an aliphatic monohydric alcohol and an aliphatic monohydric alcohol ether, (D ₂ ) dialkyl ketone, ( D ₃ ) ester of fatty acid with aliphatic monohydric alcohol, (D ₄ ) dialkyl carbonate, (E ₁ ) poly C ₂ ~ C ₆ alkanediol, (E ₂ ) poly C ₂ ~ C ₆ alkanediol Ester with fatty acid, (E ₃ ) poly C ₂ ~ C ₆ alkanediol and aliphatic monohydric alcohol ether, (E ₄ ) poly C ₂ ~ C ₆ alkanediol and chain hydrocarbon tetracarboxylic acid, chain hydrocarbon Esters of carboxylic acid or dicarboxylic acid of chain hydrocarbon, (E ₅₎ poly C ₂ ~ C ₆ alkylene glycol and a chain hydrocarbon tetraol, chain hydrocarbon triol or chain hydrocarbon diol of ether, and (F ₁ ) Groups of chain alkanes. The absorbent article according to claim 1 or 2, wherein the blood modifying agent has a weight average molecular weight of 2,000 or less. The absorbent article according to claim 1 or 2, wherein the surface sheet is provided between a plurality of ridge portions having a side-by-side arrangement formed by bending a cross section and abutting the ridge portion The bottom portion is disposed; the ridge portion is a wall portion including a plurality of openings having side walls extending in the extending direction of the ridge portion. The absorbent article according to claim 1 or 2, wherein the surface layer of the surface sheet at least in the opposite direction of the user's body fluid discharge port is formed by the aforementioned resin layer on the skin side surface The film is formed such that the surface sheet and the absorber are not joined at least in a region opposite to the discharge port of the body fluid of the user.