JPH08120097A - Breathable sheet and absorbent article using the same - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a moisture-permeable sheet which is excellent in sheet strength, particularly fir-proof strength, has moisture permeability, water pressure resistance and the like, and further has high safety to human body and high stability against deterioration. To provide an absorbent article that vaporizes and releases absorbed body fluid without leaking and gives a comfortable wearing feeling without stuffiness. SOLUTION: A non-porous moisture-permeable sheet comprising a block-copolymerized polyester resin of a hard component and a soft component and a filler, and a liquid-permeable surface material 2.
And an absorbent article comprising a leak-proof backing material 4 and an absorber 3 arranged between these double-sided materials, wherein the backing material is formed of the moisture-permeable sheet. Absorbent article.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture-permeable and waterproof non-porous moisture-permeable sheet and an absorbent article using the same.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
As the moisture-permeable and waterproof sheet, a finely obtained sheet is obtained by melt-kneading 40 parts by weight or more of an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction. Porous sheets are known. Further, as the microporous sheet, in Japanese Patent Publication No. 5-38011, a specific crystalline polymer (such as polypropylene) and a specific compound (such as mineral oil) are melt-kneaded, and in a sheet forming (cooling) process. A microporous sheet obtained by stretching a phase-separated sheet has also been proposed. The above microporous sheet is excellent in air permeability and moisture permeability and does not cause a dew condensation phenomenon, and therefore it is suitably used as a wallpaper, a packaging sheet or the like. Further, the microporous sheet, by further imparting flexibility, for example,
It can be used as a backing material for absorbent articles such as disposable diapers and sanitary napkins.

In order to impart flexibility to the microporous sheet, it has been generally proposed to use linear low density polyethylene as the olefin resin. However, simply mixing a large amount of inorganic filler with the low density polyethylene,
After being formed into a sheet, a microporous sheet obtained by uniaxially or biaxially stretching has a problem in sheet strength, and particularly when used as a backing material for absorbent articles, the required tear strength, There was a problem that the fir-proof strength could not be satisfied.

In order to solve the above problems, a method of adhering a non-woven fabric to the above-mentioned microporous sheet with a hot melt adhesive or the like to improve the strength has been proposed, but in this method, the tear strength is Although it is improved, there is a problem that the fir-proof strength is insufficient, and the movement of the human body during wearing causes the micropores to act as starting points to propagate and expand cracks, resulting in loss of liquid leakage resistance.

Further, Japanese Laid-Open Patent Publication No. 6-134000 proposes a non-porous stretchable and moisture-permeable sheet obtained by laminating a specific polyurethane sheet and a stretchable nonwoven fabric.

However, the above-mentioned polyurethane sheet causes various problems as described below depending on the isocyanate used. That is, when an aromatic isocyanate is used as the above-mentioned isocyanate, since it has high reactivity with a polyol or the like which reacts with the isocyanate to form polyurethane,
Although the amount of unreacted isocyanate remaining in the polyurethane sheet is small, it has a problem that the value of the product is remarkably impaired when it is used for absorbent articles, etc., for example, because the polyurethane sheet violently turns yellow even when stored under natural conditions.

When a non-aromatic isocyanate is used as the above-mentioned isocyanate, the resulting polyurethane sheet is less likely to yellow, but the reactivity of the non-aromatic isocyanate is poor, so that unreacted isocyanate remains and, for example, absorbability. When used in articles and the like, there is a problem that the unreacted isocyanate severely irritates the skin.

When any of aromatic isocyanate and non-aromatic isocyanate is used, these isocyanates also react with water in the air to form a urea bond, but they react with water in the latter stage of the polymerization reaction. The reaction (1) does not reach urea bond and remains as an amine, so that there is a problem that the amine vigorously irritates the skin and causes fogging. Further, when the polyurethane sheet is decomposed, it produces an amine and becomes a base of skin irritation when used in absorbent articles and the like (especially, the above-mentioned polyurethane sheet exhibiting moisture permeability in the absence of pores is used in absorbent articles). It is more likely to be decomposed than ordinary polyurethane due to water absorption.). Further, the amine catalyst used in the urethanization reaction also becomes a skin irritation group. In short, the polyurethane sheet is not preferable for applications such as absorbent articles that come into direct contact with the human body.

As described above, in the conventional microporous sheet,
At present, the safety of the human body and the desired physical properties such as flexibility, strength, especially fir resistance, moisture permeability and water pressure resistance have not yet been satisfied.

Further, Japanese Patent Laid-Open No. 1-141669 discloses an absorbent article using a sheet made of a moisture-permeable copolyetherester. However, when the above-mentioned sheet is used as the backing material of an absorbent article, the performance required for the backing material cannot be satisfied to the extent required for practical use. That is, as the backing material of the absorbent article, for example, in a sanitary napkin, tear strength of the sheet is required when peeling from the shorts, and in a sanitary napkin having a side flap, rigidity, volume, Also, the softness and the like are required, but the sheet proposed in the above publication does not satisfy these requirements.

Therefore, an object of the present invention is to have excellent sheet strength, especially fir resistance, moisture permeability, water pressure resistance, etc.
Another object of the present invention is to provide a moisture-permeable sheet that is highly safe to the human body and highly stable against alteration and the like. Another object of the present invention is to provide an absorbent article that vaporizes and releases absorbed body fluid without leaking, giving a comfortable wearing feeling without stuffiness.

[0012]

Means for Solving the Problems The inventors of the present invention have made extensive studies in order to solve the above-mentioned problems, and as a result, a sheet comprising a specific block-copolymerized polyester resin and a filler achieved the above-mentioned object. I found that I would get it.

The present invention has been made on the basis of the above findings, and provides a non-porous moisture-permeable sheet comprising a block-copolymerized polyester resin of a hard component and a soft component and a filler. is there.

Further, the present invention provides an absorbent article comprising a liquid-permeable surface material, a leak-proof back surface material, and an absorber disposed between these double-sided materials, wherein the back surface material is the above-mentioned material. An absorbent article characterized by being formed of a moisture-permeable sheet.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The moisture-permeable sheet of the present invention and the absorbent article of the present invention using the same will now be described in detail. First, the moisture-permeable sheet of the present invention will be described in detail.

The moisture-permeable sheet of the present invention is a non-porous moisture-permeable sheet made of a specific block copolymerized polyester resin and a filler. The moisture permeable sheet preferably has a film thickness of 10 to 500 μm and a moisture permeability of preferably 0.5 g / 100 cm ² · Hr or more, more preferably 1.
0 to 2.5 g / 100 cm ² · Hr, water pressure resistance is preferably 2 m or more, and fir-proof strength is preferably 30 minutes or more, more preferably 60 minutes or more, and most preferably 12
0 minutes or more.

The specific block copolymerized polyester resin forming the moisture-permeable sheet is a block copolymer composed of a hard component and a soft component.

Preferred examples of the hard component include polyesters obtained by reacting a dicarboxylic acid component and a diol component. Examples of the dicarboxylic acid component include aromatic dicarboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, and naphthalene dicarboxylic acid; aliphatic dicarboxylic acids such as succinic acid, adipic acid, and sebacic acid. , Ethylene glycol, propylene glycol, butanediol, hexamethylene glycol, neopentyl glycol, and other aliphatic diols; cyclohexanedimethanol, paraxylylene glycol, aromatic diols such as bisphenol A adduct of ethylenedioxide with 2 moles, and the like. In each case, they can be used alone or as a mixture.

The dicarboxylic acid component and the diol component are preferably combined by using those having an aromatic ring in at least one of them, and the average molecular weight of the repeating unit is linked to the aromatic ring. It is preferable to select and combine the above dicarboxylic acid component and the above diol component so that the amount per ester group is 180 or less, preferably 160 or less.

As the soft component, polyether and / or aliphatic polyester is used. Polyethylene glycol, poly (ethylene / propylene) block polyglycol, polytetramethylene glycol, polyhexamethylene glycol, etc. are used as the polyether, and polyethylene adipate, polybutylene adipate, polycaprolactone, etc. are used as the aliphatic polyester. Is mentioned.

In the block copolymerized polyester resin, the hard component is a polyester of an aromatic dicarboxylic acid and an aliphatic diol or a polyester of an aliphatic dicarboxylic acid and an aromatic diol, and the soft component is a polyester. Ether and / or aliphatic polyesters are preferred. Specifically, the hard component is terephthalic acid, phthalic acid and / or naphthalenedicarboxylic acid,
Desirably, it is a polyester of phthalic acid and / or naphthalenedicarboxylic acid and one or more selected from the group consisting of ethylene glycol, propylene glycol and butanediol, preferably ethylene glycol, propylene glycol and tetramethylene glycol. The soft component is poly (ethylene /
Propylene) block polyglycol and / or polytetramethylene glycol are preferred.

The glass transition temperature (Tg) of the hard component is preferably 50 ° C. or higher, and the glass transition temperature (Tg) of the soft component is preferably 20 ° C. or lower. It is preferable in terms of non-blocking property, moisture permeability, and moldability. Tg of the above hard component is 50
When the temperature is lower than 0 ° C, when used as a backing material of an absorbent article, the shape retention property is poor at the use / storage temperature, and when the Tg of the soft component is higher than 20 ° C, the moisture permeability at the use temperature decreases. Therefore, the above range is preferable.
Here, the glass transition temperature (Tg) is a value obtained by measuring with DSC.

The molecular weight of the block copolymerized polyester resin and the composition ratio of the hard component and the soft component are the kinds and molecular weights of the dicarboxylic acid component and the diol component used as the hard component, and the polyether used as the soft component. And / or the type and molecular weight of the polyester, and further, the melt flow index (MF
I) is preferably 1 to 25, more preferably 5 to 1
8. Equilibrium moisture content is preferably 0.30 to 1.40%,
It is more preferable to adjust the molecular weight and the composition ratio so as to be 0.50 to 0.90% from the viewpoints of film strength, non-blocking property, moisture permeability and molding processability.

If the MFI is less than 1, melt molding, etc.
Molding processability is inferior, and if it exceeds 25, tackiness at room temperature
There is strong blocking and poor film shape retention.
Therefore, it is preferably within the above range. Also, the above equilibrium water
If the fraction is less than 0.30%, the water vapor permeability will be low,
If it exceeds 1.40%, the elastic modulus decreases and the shape retention becomes poor.
Since it is inferior and has strong adhesiveness and blocking occurs,
It is preferably within the range. Here, the MFI is A
At 200 ° C. measured according to STMD1238
It is a value. In addition, the block copolymerized polyester resin
Of the above, those having a crystal melting point of more than 180 ° C.
MFI was measured according to ASTM D1238 23
It is a value at 0 ° C, and it is preferable that the value is in the above range.
Good. The above equilibrium moisture content is 23 ° C / 0% RH.
Weight when stored for 48 hours is W ₀, 23 ° C / 65% RH
W for 48 hours₁Then, [(W₁
-W₀) × 100] / W₀Is the value indicated by.

In order to prepare the block copolymerized polyester resin, the hard component and the soft component can be easily obtained by a generally known transesterification reaction.

The above-mentioned block copolymerized polyester resin used in the present invention is not only itself but also the decomposition product of the block copolymerized polyester resin is a safe one which does not cause skin irritation, and is colored with time. It is a resin that does not exist at all and hardly deteriorates, and is an excellent material as a material for hygiene products such as absorbent articles.

The filler used in the present invention together with the block copolymerized polyester resin is a component used for improving the sheet forming property, blocking resistance and sheet rigidity of the moisture permeable sheet. That is, in order to obtain a non-porous sheet having moisture permeability from the block copolymerized polyester resin, it is preferable to increase the ratio of the soft component, but if the ratio of the soft component is increased,
The flow and deformation of the resin occur, causing a problem that the blocking property is strong and the film forming property is significantly lowered. As a result of various studies to solve this problem, the present inventors have mixed the block copolymerized polyester resin with a filler that is incompatible with the block copolymerized polyester resin, thereby reducing the moisture permeability. It was found that the sheet formability can be improved and blocking can be prevented. Further, the sheet rigidity can be improved by mixing the filler.

As described above, the above-mentioned filler is a component used for achieving both the moisture permeability of the moisture-permeable sheet of the present invention and the contradictory properties of sheet forming property and blocking resistance, and the block copolymerized polyester resin described above. Any filler that is incompatible with can be used without any particular limitation. Specifically, for example, “Development of Polymer Compound Business” [May 31, 1993, issued by CMC Co., Ltd.] Fillers described in the section "Higher functionality by fillers" on pages 169 to 179, and "Practical Handbook of Additives for Supplementary Plastics and Rubbers" [1989]
Issued by Chemical Industry Co., Ltd. on July 20, 2014] 489-787
Examples thereof include the fillers and reinforcing materials described in the "filler" and "reinforcing agent" sections on the page. When using the above-mentioned filler, it can be used according to the usage described in the above-mentioned literature.

Among the above-mentioned fillers, an inorganic substance or an organic substance which is not easily softened at the molding temperature of the above block copolymerized polyester resin is preferably used, and specific examples thereof include synthetic or natural pulp powder, silica, talc and the like. Further, the shape of the filler is preferably granular in terms of melt-kneading moldability, and preferably fibrous or flake in terms of reinforcement. Furthermore, the average size of the filler is
The thickness is preferably 0.5 to 1000 μm, and the aspect ratio is preferably 2 to 20.

The amount of the filler used is 0.1 to 8 parts by weight based on 100 parts by weight of the block copolymerized polyester resin.
The amount is preferably 0 parts by weight, more preferably 1 to 60 parts by weight.

The method for producing the moisture-permeable sheet of the present invention comprising the block copolymerized polyester and the filler is as follows. The block copolymerized polyester resin and the filler are melt-kneaded, discharged from a die and cooled by a roll. Melt kneading molding method for molding by molding, the block copolymerized polyester resin is dissolved in a soluble solvent (for example, a chlorine-based solvent such as tetrachloroethane) is mixed with the filler, and then coated on a release film and dried. Then, it can be easily manufactured by a method of removing the release film.

Since the block copolymerized polyester resin is a resin having good thermal stability, the melt extrusion method is preferably used economically as the method for producing the moisture-permeable sheet of the present invention.

The moisture-permeable sheet according to the present invention may contain a stabilizer, a colorant and the like, if necessary.

Further, since the block copolymerized polyester resin has good stretchability which is classified as a thermoplastic elastomer, the moisture-permeable sheet of the present invention has excellent stretchability and is suitable for use as a backing material for absorbent articles. Particularly suitable. Further, as described later, the moisture-permeable sheet of the present invention can be used as a backing material of the absorbent article of the present invention, and also as a material for lining of tents, lining of outdoor clothing such as rainwear, etc. be able to.

Next, the absorbent article of the present invention is shown in FIG.
Will be described in detail with reference to. As shown in FIG. 1, a sanitary napkin 1 as an absorbent article of the present invention is arranged between a liquid-permeable surface material 2, a leak-proof back material 4, and these double-sided materials 2 and 4. The absorbent body 3 and the back surface material 4 are formed of the moisture permeable sheet (the moisture permeable sheet of the present invention).

Since the above sanitary napkin uses the moisture-permeable sheet of the present invention as the backing material, the backing material does not get stuffy because it allows water vapor to pass through, has a flexible fit, and can be moved by the movement of the human body. It is excellent in leakproofness without cracks and gives a comfortable fit.

In the above description, the sanitary napkin has been exemplified, but the absorbent article of the present invention is not limited to this, and other absorbent articles such as disposable diapers and absorbent articles can be used. It is also applied to pads. Further, as the surface material 2 and the absorber 3, a normal surface material and an absorber formed of a generally known material can be used without particular limitation.

[0038]

The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited thereto.

[Example 1] Block copolymerized polyester resin [manufactured by Toyobo Co., Ltd., trade name "Perprene P-30"
B ”(a block copolymerized polyester resin having a Tg of 57 ° C. composed of terephthalic acid and butanediol as a hard component and a polyether diol having a Tg of 7 ° C. composed of polytetramethylene glycol as a soft component, and MFR = 14, equilibrium Moisture content = 0.58%)] 10
After preliminarily mixing 0 part by weight and 10 parts by weight of silica [Tokuyama Soda Co., Ltd., trade name "FINESEAL F-80", average particle size 1.5 µ) with a mixer, an ordinary φ50 mm extruder is used. , Melt-discharge from T-die, take-up speed 20
It was taken out at m / min to obtain a non-porous moisture-permeable sheet having a thickness of 25 μm.

With respect to the obtained moisture-permeable sheet, moisture permeability,
The water pressure resistance, tear strength and rigidity were evaluated. The results are shown in [Table 1] below. The water vapor transmission rate and water pressure resistance were measured by the following measuring methods.

(Measurement method) (1) Water vapor permeability; measured according to JIS Z0208 (2) Water pressure resistance; measured according to JIS L1092B method (3) Tear strength; measured according to JIS P8116 (4) Rigidity: A sanitary napkin having a side flap was prepared using the obtained leakproof sheet, and 10 people installed this on a monitor, and the rigidity was evaluated according to the following criteria.・ The operability of the side flaps is very good ◎ ・ The operability of the side flaps is good ・ ・ ・ ・ ○ ・ The operability of the side flaps is somewhat inferior ・ ・ ・ △ ・Poor operability of the side flaps ...

A sanitary napkin shown in FIG. 1 was prepared using the moisture permeable sheet. That is, by the moisture permeable sheet to form a rear material, polyethylene - with nonwoven polypropylene of composite fibers having a basis weight 20 g / m ² to form a surface material, using a linear pulp consisting of basis weight 260 g / m ² To form an absorbent body, and the members are adhered so that the nonwoven fabric layer of the moisture-permeable sheet is in contact with the absorbent body, and the length 170
A sanitary napkin having a structure shown in FIG. 1 and having a width of 70 mm and a width of 70 mm was obtained. The sanitary napkins thus obtained were evaluated for blocking property, fir resistance and stuffiness as follows. The results are shown in [Table 1] below.

(5) Blocking property: The two moisture-permeable sheets thus obtained were stacked and left at room temperature (20 ° C.) for 1 hour and then peeled off. The state at the time of peeling was observed and evaluated as follows. Peels without sticking at all, and is completely non-sticky ...
・ ・ ・ ・ ◎ It peels, but it is slightly sticky.
・ ・ ・ ・ ○ Peeled, but sticky, and films are reattached to each other ・
・ ・ ・ ・ △ Not integrated and peeled ・ ・ ・
・ ・ ・ ・ ×

(6) Fir-proof strength: 6 g of horse blood was injected into the obtained sanitary napkin to absorb it, and then an adult-sized human body model composed of rubber and iron suspected bones (the human body model was used for both legs and crotch). Wears the same movement as the human body) through shorts so as to be in a normal wearing state, and 120 steps / mi
When both legs were moved by n, the time when horse blood leaked through the backing material was measured and evaluated. At this time, when the two legs are moved, approximately the central part in the length direction of the napkin becomes convex with the surface material facing up (human body model side), and both ends in the width direction of the napkin follow the movement of the legs. So fir works for the whole napkin. The distance that both ends of the napkin move back and forth is about 20 mm.

(7) Moisture index: The obtained sanitary napkins were attached to 10 monitors, and the stuffiness index was evaluated according to the following criteria.・ There is no stuffiness and a refreshing feeling ・ ・ ・ ○ ・ Somewhat stuffiness ・ ・ ・ ・ ・ ・ ・ ・ △ ・ Very stuffy ・ ・ ・ ・ ・ ・ ×

Example 2 In place of the silica used in Example 1, calcium carbonate [manufactured by Bihoku Powder Co., Ltd., “Softon 2200”, average particle size 1 μ) was used, and the block copolymerized polyester resin 40 was used. Parts by weight and calcium carbonate 10
A thickness of 25 was obtained in the same manner as in Example 1 except that the amount was 0 weight part.
A moisture permeable sheet of μ was obtained. The obtained moisture-permeable sheet was evaluated in the same manner as in Example 1. The results are shown in [Table 1] below. Further, a sanitary napkin was obtained in the same manner as in Example 1 using the obtained moisture-permeable sheet. The obtained sanitary napkin was evaluated in the same manner as in Example 1.
The results are shown in [Table 1].

[Comparative Example 1] 100 parts by weight of linear low-density polyethylene ["Ultzex 2520F", trade name, manufactured by Mitsui Petrochemical Co., Ltd.], 150 parts by weight of surface-treated calcium carbonate (1.1 micron), And a mixture of 5 parts by weight of a polyester resin (trimethylolpropane / adipic acid / stearic acid = 2 mol / 1 mol / 4 mol, SV = 240, AV = 1, OHV = 8) were melt-kneaded. Was formed into a sheet having a film thickness of 50 μm by an inflation molding machine, stretched 2.3 times at 50 ° C. using an ordinary roll drawing machine, and annealed at 80 ° C. to obtain a 45 μm sheet which was whitened on the entire surface. . The obtained sheet was evaluated in the same manner as in Example 1.
The results are shown in [Table 1]. Further, a sanitary napkin having the constitution shown in FIG. 1 in which the backside material was formed by the above-mentioned sheet was obtained in the same manner as in Example 1 except that the backside material was formed by the obtained sheet. The obtained sanitary napkin was evaluated in the same manner as in Example 1. The results are shown in [Table 1].

[Comparative Example 2] Styrenic thermoplastic elastomer (manufactured by Shell Chemical Co., trade name "SEBS Kleinton G
1657 ″) was used to perform T-die molding to obtain a leak-proof sheet having a film thickness of 25 μm. The obtained sheet was evaluated in the same manner as in Example 1. The results are shown in [Table 1]. Further, Example 1 was repeated except that the backing material was formed from the obtained sheet.
In the same manner as described above, a sanitary napkin having the constitution shown in FIG. The obtained sanitary napkin was evaluated in the same manner as in Example 1. The results are shown in [Table 1].

[0049]

[Table 1]

[0050]

The moisture-permeable sheet of the present invention has a sheet strength,
In particular, it is excellent in fir-proof strength, has moisture permeability, water pressure resistance, etc., and is highly safe to humans and highly stable against deterioration. In addition, the absorbent article of the present invention vaporizes and releases the absorbed body fluid without leaking, giving a comfortable wearing feeling without stuffiness.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a sanitary napkin as an example of an absorbent article of the present invention using a moisture-permeable sheet of the present invention.

[Explanation of symbols]

 1 Sanitary napkin 2 Surface material 3 Absorber 4 Back material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area A61F 5/44 H 7108-4C B32B 27/12 9349-4F 27/36 9349-4F // C08L 67 : 00 A61F 13/18 320 (72) Inventor Takao Kasai, 2606, Akao, Kaiga-cho, Haga-gun, Tochigi Prefecture, Kao Corporation Stock Research Institute (72) Inventor, Fumiaki Kikuchi, 2606, Akao, Kai-cho, Haga-gun, Tochigi Research Institute, Kao Stock Company (72) Inventor Yasuhiro Torimae 1334 Minato Minato, Wakayama City, Wakayama Prefecture Kao Corporation Research Laboratory

Claims (6)

[Claims] 1. A non-porous moisture permeable sheet comprising a block-copolymerized polyester resin of a hard component and a soft component and a filler. 2. The block copolymerized polyester resin has a melt flow index of 1 to 25 and an equilibrium moisture content of 0.30% to 1.40%, and
The glass transition temperature (Tg) of the hard component is 50 ° C. or higher, and the glass transition temperature (Tg) of the soft component is 20.
The moisture permeable sheet according to claim 1, wherein the moisture permeable sheet has a temperature of ℃ or less. 3. The hard component is a polyester of phthalic acid and / or naphthalenedicarboxylic acid and one or more selected from the group consisting of ethylene glycol, propylene glycol and butanediol, and the soft component is poly (Ethylene / propylene) block polyglycol and / or polytetramethylene glycol. The moisture-permeable sheet according to claim 1 or 2, which is characterized in that it is a polytetramethylene glycol. 4. The moisture-permeable sheet according to claim 1, wherein the filler is a fibrous, granular or flake-shaped inorganic substance or organic substance. 5. The moisture-permeable sheet has a film thickness of 10 to 10.
500 μm, moisture permeability 0.5g / 100cm ² · H
The moisture-permeable sheet according to any one of claims 1 to 4, which has a water pressure resistance of 2 m or more and a fir-proof strength of 30 min or more. 6. An absorbent article comprising a liquid-permeable front surface material, a leakproof back surface material, and an absorber arranged between these double-sided materials, wherein the back surface material is any one of claims 1 to 5. An absorbent article, which is formed of the moisture-permeable sheet according to any one of 1.