JPH08117271A - Sanitary napkin - Google Patents

Abstract

PURPOSE: To provide a sanitary napkin using a moisture permeable sheet capable of absorbing a discharged body liquid without any lateral leakage, giving a good feeling of use without causing any stuffy condition, having high strength, particularly high strength against wrinkling, further having high moisture permeability and water pressure resistance, and ensuring freedom from deterioration with high safety and stability maintained for a human body. CONSTITUTION: A sanitary napkin 1 has a center absorbent body 10 made of a liquid permeable surface sheet 2, a liquid inpermeable back sheet 4 and an absorptive material 3 laid in between, as well as a side barrier 20 laid at both right and left sides of the body 10 for preventing a lateral leakage. Regarding the napkin 1 so manufactured, the barrier 20 and the sheet 4 are integrated with each other via a non-porous moisture permeable resin sheet made of a block copolymer polyester resin of hard and soft components.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sanitary napkin having liquid-resistant side barriers on both sides of a liquid absorbing surface.

[0002]

2. Description of the Related Art The biggest drawback of the sanitary napkins used in the past is that they cause side leakage. That is, menstrual blood is not excreted continuously in a constant amount, but is excreted intermittently, and when a large amount of menstrual blood is temporarily excreted, the menstrual blood cannot be absorbed by the absorption layer and is absorbed. 5 shows the phenomenon of leakage on a liquid-permeable topsheet covering the surface of a layer. Then, the overflowed menstrual blood leaks from both sides of the upper surface of the absorbent layer to cause lateral leakage and contaminate the clothes. For this reason, various proposals have been made to solve the above-mentioned drawbacks, for example, Japanese Utility Model Laid-Open No. 3-885.
No. 11 discloses a sanitary napkin having a side barrier formed by sticking a liquid-impermeable sheet other than the back sheet over the entire length of both sides of the absorbent product. However, in the sanitary napkin, when attaching the side barrier, a strip-shaped liquid-impermeable sheet prepared separately from the liquid-impermeable backsheet must be attached to the topsheet, so that the manufacturing process is There are drawbacks in that it becomes complicated, waste of materials increases, and cost increases. Further, since the liquid-impermeable sheet used for the back sheet or the side barrier does not have moisture permeability, there is a problem that stuffiness occurs during mounting and the usability is poor.

Conventionally, as a liquid-impermeable sheet having a moisture permeability, an olefin resin such as polyethylene or polypropylene is melt-kneaded with 40 parts by weight or more of an inorganic filler to form a sheet, which is then uniaxially or biaxially oriented. There is known a microporous sheet obtained by stretching into a sheet. Also,
As the above-mentioned microporous sheet, in JP-B-5-38011, a specific crystalline polymer (polypropylene or the like) and a specific compound (mineral oil or the like) are melt-kneaded, and phase separation is performed in a sheet forming (cooling) process. There is also proposed a microporous sheet obtained by stretching a sheet that has undergone stretching. The microporous sheet is excellent in breathability and moisture permeability and does not cause a dew condensation phenomenon, and thus is suitably used as a wallpaper or a packaging sheet, but a back sheet of an absorbent article such as a disposable diaper and a sanitary napkin. Further, it is necessary to add flexibility to use it as a side barrier.

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,
A microporous sheet obtained by uniaxially or biaxially stretching after being formed into a sheet has a problem in sheet strength, and is required particularly when used as a back sheet or side barrier of an absorbent article. There was a problem that the tear strength and 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. 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 Patent Application Laid-Open No. 6-134000 proposes a non-porous stretchable 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.

Further, when a non-aromatic isocyanate is used as the above-mentioned isocyanate, the obtained polyurethane sheet is hard 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 isocyanates and non-aromatic isocyanates 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 Application 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 a back sheet or a side barrier of an absorbent article, the required performance has not been practically satisfied. That is, as the back sheet or side barrier of the absorbent article, for example, in a sanitary napkin,
Sheet rigidity is required when peeling from shorts,
Further, a sanitary napkin having a side flap is required to have rigidity, volume, and good touch, but the above-mentioned sheet proposed in the above publication does not satisfy these requirements.

[0012] Therefore, an object of the present invention is to provide a sanitary napkin which can absorb excreted body fluid without leaking laterally and which provides a comfortable wearing feeling without stuffiness. Another object of the present invention is to use a moisture-permeable sheet which is excellent in sheet strength, particularly fir-proof strength, has moisture permeability and water pressure resistance, and has high safety and stability for human body and does not deteriorate. The purpose is to provide the sanitary napkin that was used.

[0013]

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, as a result of using a non-porous moisture-permeable resin sheet made of a specific block copolymerized polyester, a back sheet and It has been found that a sanitary napkin having a side barrier can achieve the above object.

The present invention has been made on the basis of the above findings, and has a central absorbent composed of a liquid-permeable top sheet 2, a liquid-impermeable back sheet 4, and an absorbent material 3 interposed between these sheets. In the sanitary napkin 1 including the body portion 10 and the side barriers 20 for preventing lateral leakage, which are arranged on both right and left sides of the central absorbent body portion 10, the side barrier 20 and the backsheet 4 are made of a hard material. The present invention provides a sanitary napkin, which is integrally formed of a non-porous moisture-permeable resin sheet formed of a block-copolymerized polyester resin of a soft component and a soft component.

In the sanitary napkin of the present invention, since the back sheet and the side barrier are integrally formed of a specific moisture-permeable resin sheet, side leakage is caused even when irregular menstrual blood is excreted. It also prevents water vapor from passing and prevents it from getting stuffy. It is flexible and has a good fit. It does not cause cracks due to the movement of the human body. It also has excellent leakproofness and gives a comfortable fit.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The sanitary napkin of the present invention will be described in detail below with reference to the drawings.

First, the sanitary napkin of the present invention will be described in detail with reference to FIG. Here, FIG. 1 is a perspective view showing a state in which the sanitary napkin of the present invention is cut at the central portion in the longitudinal direction.

The sanitary napkin 1 of the present invention shown in FIG.
A central absorbent body portion 10 composed of a liquid-permeable topsheet 2, a liquid-impermeable backsheet 4, and an absorbent material 3 interposed between these sheets, and arranged on both left and right sides of the central absorbent body portion 10. And a side barrier 20 for preventing side leakage.
The side barrier 20 and the backsheet 4 are integrally formed of a non-porous moisture permeable resin sheet formed of block copolymerized polyester resin of hard component and soft component.

More specifically, in the sanitary napkin 1, the central absorbent body portion 10 is made of the absorbent material 3.
The surface sheet 2 is adhered to both side surfaces and the surface of the absorbent material with an adhesive or the like, and the back surface sheet 4 made of the moisture permeable resin sheet is disposed on the back surface side of the absorbent material 3. The side barrier 20 is composed of a fixed portion 22 adhered to the side surface of the central absorbent body 10 and an unadhered free end 21, and the moisture permeable resin sheet is attached to the central absorbent body 1.
It is formed by bending from the back surface side to the front surface side along both left and right sides of 0 and then folding back inside. A string-like elastic member 5 is arranged on the free end 21 over the entire length thereof. The distance W ₁ between the side barriers 20 provided on both the left and right sides is 30 mm or more, and further 45
Preferably, the side barrier 20 is about 90 mm.
The width W ₂ of the above free end is 20 mm or less, and further 5 to 1
It is preferably 0 mm.

As described above, by incorporating the string-shaped elastic member 5 in the side barrier 20, the compatibility with the body can be increased and the side leakage prevention effect can be increased.

As the surface sheet 2, any of non-woven fabric, aperture film, mesh and the like can be used. For example, when a non-woven fabric is used, the non-woven fabric generally used in absorbent articles can be used without particular limitation. For example, it is formed from a single resin such as polyethylene, polypropylene, polyethylene terephthalate, and polyamide. It may be a composite filament such as a filament, a core / sheath structure, a half-moon conjugation structure, etc. As a manufacturing method, a filament obtained by normal melt spinning is stretched and crimped if necessary, and the cut short fiber is heated or glued. Nonwoven fabrics that are bonded or entangled with a stream of water or needles, that is, any of a wet method, a dry method, a spun lace method, a spun bond method, and the like can be used. The non-woven fabric has a basis weight of 5 to 200 g / cm ^{2 in} terms of flexibility, texture, and productivity,
The thickness is preferably 50 μm to 5 mm. Particularly preferable basis weight is 8 to 50 g / cm ² , and particularly preferable thickness is 100.
μm to 2 mm.

When an apertured film is used as the surface sheet, the apertured area of the apertured film is limited by the liquid permeability and the liquid return prevention property. Since the sheet formability deteriorates as it becomes inferior and increases on the other hand, it is necessary to set the range to satisfy both the liquid permeability and the liquid return preventing property. The number of openings per unit area is preferably 10 to 100 / cm ² , and more preferably 30 to 60 / cm ² . Also, from the viewpoint of flexibility and texture, the basis weight is 5 to 90 g / cm ² , and the thickness is 1
0 μm to 5 mm is preferable. Particularly preferred basis weight is 10-5
0 g / cm ² , a particularly preferred thickness is 100 μm to ² mm.

The absorbent body 3 is preferably composed mainly of defibrated pulp and a high-molecular-weight absorbent polymer. In addition to the absorbent body 3, a mixture of thermoplastic resin, cellulose fiber and superabsorbent polymer is heat-treated. Is preferred. The high molecular weight absorbing polymer is preferably in the form of particles having a property of absorbing and holding 20 times or more of its own weight of liquid and having a property of gelling. As such a high molecular weight absorbing polymer, a starch-acryl can be used. Acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer,
A crosslinked product of sodium carboxymethyl cellulose, an acrylic acid (salt) copolymer and the like are preferable.

The surface of the side barrier sheet may be embossed to form irregularities. By the embossing treatment, it is possible to form various patterns such as a matte treatment by microembossing, straight lines, turtle shells, weaves, and pinpoints. For example, the shape of the irregularities formed by the pinpoint pattern preferably has a height of 0.05 to 1 mm and a density of 10 to 100 pieces / cm ² , but there is no problem even if only matting treatment is performed. Alternatively, the unevenness can be formed by a method of adding various fillers that are commonly used in the art. For example, “Development of polymer compound business” 9
3.5.31. P169 issued by CMC Co., Ltd.
Fillers and their use described in the section "Higher functionality with fillers", "Practical Handbook of Additives for Supplemented Plastics and Rubbers" 89.7.20. The filler, the reinforcing material, and the usage thereof described in P489 to P787 "Filler" and "Reinforcing Agent", which are issued by Kagaku Kogyo Co., Ltd. are used. Among them, a granular inorganic material or an organic material which is difficult to soften at the molding temperature is preferable from the viewpoint of melt-kneading moldability. A fibrous material is preferable from the viewpoint of reinforcement. From the viewpoint of moldability and reinforcing property, the average size is preferably 0.5 μm to 1000 μm and the aspect ratio is preferably 2 to 20. Examples of preferable fillers include synthetic or natural pulp powder, silica, talc, titanium oxide, and ultra-high molecular weight polyethylene powder. The amount of the filler is preferably 0.1 to 80 parts by weight, more preferably 1 to 60 parts by weight, based on 100 parts by weight of the block copolymerized polyester resin.

In the sanitary napkin of the present invention, the moisture permeable resin sheet integrally forming the back sheet and the side barrier is a non-porous material formed of a specific block copolymerized polyester resin. It is a moisture-permeable resin sheet.

The moisture permeable resin sheet preferably has a film thickness of 5 to 100 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 120.
More than a minute.

The specific block copolymerized polyester resin forming the moisture-permeable resin 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, 1,2-bis (p-carboxyphenoxy) ethane, terephthalic acid and naphthalene dicarboxylic acid; fats such as succinic acid, adipic acid and sebacic acid. Group dicarboxylic acid, and the like, as the diol component, ethylene glycol,
Aliphatic diols such as propylene glycol, butanediol, hexamethylene glycol, neopentyl glycol; cyclohexanedimethanol, paraxylylene glycol, cyclohexanediol, bisphenol A
Examples thereof include aromatic diols such as 2 mol adduct of ethylenoxide, and the like, and each can be used alone or as a mixture.

The dicarboxylic acid component and the diol component are preferably combined using at least one having an aromatic ring. The molecular weight of the entire hard component is preferably 200 to 500.
0, more preferably 500 to 300, and the average molecular weight of the repeating unit is 1 linked to the aromatic ring.
It is preferable to select and combine the dicarboxylic acid component and the 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. The polyether preferably has a molecular weight of 500 to 5
000, more preferably 800 to 3000, polyethylene glycol, poly (ethylene / propylene) block polyglycol, polytetramethylene glycol, polyhexamethylene glycol, etc. are used. As the aliphatic polyester, for example, an aliphatic saturated or unsaturated dibasic acid such as glutaric acid, adipic acid, fumaric acid, maleic acid, sebacic acid, and ethylene glycol, propylene glycol, tetramethylene glycol, neopentyl. Examples thereof include polyesters composed of dihydric alcohols such as glycol and hexamethylene glycol, and polylactones such as polycaprolactone. The molecular weight thereof is preferably 500 to 5,000, more preferably 800 to 3,000. Further, as the soft component, it is also possible to use a polyester ether, specifically, for example, the polyether, a copolymer composed of an aliphatic dibasic acid and a dihydric alcohol, or an alkylenoxide to the aliphatic polyester. Examples thereof include added copolymers, and the molecular weight thereof is preferably 500 to 500.
0, and more preferably 800 to 3000.

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 a crystalline polyester obtained from terephthalic acid and ethylene glycol or butanediol, or terephthalic acid,
One or more selected from the group consisting of phthalic acid and / or naphthalenedicarboxylic acid, preferably phthalic acid and / or naphthalenedicarboxylic acid, and ethylene glycol, propylene glycol and butanediol, preferably ethylene glycol, propylene glycol and tetramethylene glycol. Polyesters of and are particularly preferably used. As the soft component, polyether, polylactone, polyester ether, specifically, poly (ethylene / propylene) block polyglycol and / or polytetramethylene glycol are particularly preferably used.

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 less than 0 ° C, the shape retention is poor at the use / storage temperature when used as a back sheet of an absorbent article, and when the Tg of the soft component exceeds 20 ° C, the moisture permeability at the use temperature decreases. Therefore, the above range is preferable. Here, the glass transition temperature (Tg) is DSC.
It is a value obtained by measuring with.

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 20, tackiness will be obtained even 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. Further, the above block copolymer polyester resin
For fats with a melting point above 180 ° C
MFI is 2 measured according to ASTM D1238.
It is a value at 30 ° C., and the value is in the above range.
preferable. The above equilibrium moisture content is 23 ° C / 0% RH.
W for 48 hours ₀, 23 ° C / 65% R
Weight when stored in H for 48 hours is W₁Then, [(W
₁-W₀) × 100] / W₀Is the value indicated by.

The above block copolymerized polyester resin is
It can be produced by a known method. For example, a hard component such as an oligopolyester composed of terephthalic acid and butanediol is prepared in advance, and a soft component such as polytetramethylene glycol is mixed with the hard component to carry out a melt reaction. And the like.

The above-mentioned block copolymerized polyester resin used in the present invention is, of course, not only the decomposition product of the block copolymerized polyester resin but also 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 above-mentioned block copolymerized polyester resin can be easily formed by a known method to form the moisture-permeable resin sheet.

Further, in the moisture-permeable sheet of the present invention, a stabilizer and a coloring agent which are usually used can be appropriately added if necessary.

The sanitary napkin of the present invention is not limited to the above-mentioned example, and for example, the elastic member 5 can be used.
Can also be provided on part of the side barrier.

[0040]

EXAMPLES The sanitary napkin of the present invention will be specifically described 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 of Tg 7 ° C. composed of polytetramethylene glycol as a soft component, MFR = 14, equilibrium Water content = 0.58%)] was discharged from a T-die at 220 ° C. by an ordinary melt laminator, and was collected at a collecting speed of 20 m / min to obtain a film thickness of 13
A moisture permeable resin sheet of μm was obtained.

The moisture-permeable resin sheet thus obtained was evaluated for moisture permeability and water pressure resistance. 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 transmission rate: measured according to JIS Z0208 (2) Water pressure resistance; measured according to JIS L1092B method

The obtained moisture-permeable resin sheet was used as a back sheet and a side barrier to manufacture the sanitary napkin shown in FIG. At this time, as the topsheet, a basis weight of polyethylene-polypropylene composite fibers of 20 g / m ²
Using non-woven fabric, the absorbent material has a basis weight of 260 g / m ²
Of linear pulp was used. The sanitary napkin obtained had a length of 170 mm and a width of 70 mm. With respect to the obtained sanitary napkin, the dynamic maximum absorption amount, fir-proof strength and stuffiness were evaluated according to the following evaluation criteria. The results are shown in [Table 1].
Shown in

(3) Dynamic maximum absorption amount: The obtained sanitary napkin 80 is mounted on the movable female waist model 90 shown in FIG. 2 as shown in FIG. 3, and after mounting, it corresponds to 50 m / min. Horse blood was injected through the dropping tube 91 while walking at a speed, and the amount of horse blood absorbed until lateral leakage was measured.

(4) Fir-proof strength: After absorbing 6 g of horse blood into a sample, shorts were made on a human body model (adult size and legs and crotch have the same function as the human body) consisting of adult-sized rubber and iron suspected bone. Put on, move both legs at 120 steps / min,
Measure the time when horse blood leaks from the back side. When both legs are moved, the lengthwise direction of the napkin has a convex shape with the surface material facing up (on the human body model side), and both ends in the width direction follow the movements of the legs to create a fir. The distance that both ends of the napkin move back and forth is about 10 mm.

(5) Moisture rating: The same sample as in Evaluation (3) was mounted on 10 monitors, and the stuffiness rating was evaluated according to the following criteria.・ There is no stuffiness and a refreshing feeling ・ ・ ・ ○ ・ Somewhat stuffiness ・ ・ ・ ・ ・ ・ ・ ・ △ ・ Very stuffy ・ ・ ・ ・ ・ ・ ×

(6) Impression after use After the evaluation of (5) above, the sample surface was viewed on the same monitor to evaluate the impression.・ It looks bad due to spread and bleeding ........
× ・ Slightly bad spread and bleeding make it look a little bad ...
△ ・ No bleeding and good appearance ...
○

[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 polyester (consisting of trimethylolpropane / adipic acid / stearic acid = 2 mol / 1 mol / 4 mol, SV = 240, A
(V = 1, OHV = 8) 5 parts by weight of a mixture is melt-kneaded, and the film thickness is 50 by an inflation molding machine.
The sheet was formed into a sheet having a thickness of .mu.m, stretched 2.3 times at 50.degree. C. by using an ordinary roll stretching machine, and annealed at 80.degree. The obtained sheet was evaluated in the same manner as in Example 1. The results are shown in [Table 1]. Further, a sanitary napkin was produced in the same manner as in Example 1 and Example 1 except that the above sheet was used instead of the moisture permeable resin sheet. The same evaluation as in Example 1 was performed on the obtained sanitary napkin. The results are shown in [Table 1].

[Comparative Example 2] The same as Example 1 except that low density polyethylene [“SHOLEX L137”, Showa Denko KK] was used in place of the block copolymerized polyester resin used in Example 1. And resin film thickness 13 μm
Got a sheet of. The same measurement as in Example 1 was performed on the obtained sheet. The results are shown in [Table 1]. Further, a sanitary napkin was produced in the same manner as in Example 1 and Example 1 except that the above sheet was used instead of the moisture permeable resin sheet. The same evaluation as in Example 1 was performed on the obtained sanitary napkin. The results are shown in [Table 1].

COMPARATIVE EXAMPLE 3 A non-woven fabric (2 denier, 55 mm long polypropylene / polyethylene core-sheath structure filament was crimped in place of the polyester resin of Example 2, and the basis weight was 20 g / m ² and the thickness was measured by the heat bonding method. 1
A napkin was prepared in the same manner as in Example 1 using (molded to 35 μm).

[0051]

[Table 1]

[0052]

Industrial Applicability The sanitary napkin of the present invention can absorb excreted body fluid without causing lateral leakage, and provides a comfortable wearing feeling without stuffiness. Further, the sanitary napkin of the present invention is a sheet having excellent moisture resistance and water pressure resistance, particularly excellent in fir resistance, and further uses a moisture permeable sheet that is safe and stable to human body and does not deteriorate. It was what I had.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a sanitary napkin of the present invention is cut at a central portion in a longitudinal direction thereof.

FIG. 2 is a schematic view showing a movable female waist model used for measuring a dynamic maximum absorption amount.

FIG. 3 is a schematic view showing a state in which a sanitary napkin is attached to the movable female waist model shown in FIG.

[Explanation of symbols]

 1 Sanitary Napkin 2 Surface Material 3 Absorber 4 Back Material 10 Central Absorber Part 20 Side Barrier

Front Page Continuation (72) Inventor Yoichi Suzuki 2606 Akabane, Kaimachi, Haga-gun, Tochigi Prefecture Kao Corporation Stock Research Institute

Claims (5)

[Claims] 1. A central absorbent body portion 10 comprising a liquid-permeable topsheet 2, a liquid-impermeable backsheet 4, and an absorbent material 3 interposed between these sheets, and left and right sides of the central absorbent body portion 10. Side barriers 20 on both sides to prevent side leakage
In the sanitary napkin 1 including, the side barrier 20 and the backsheet 4 are integrally formed of a non-porous moisture-permeable resin sheet formed of a block-copolymerized polyester resin of a hard component and a soft component. Sanitary napkin characterized by being used. 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 sanitary napkin according to claim 1, which has a temperature of not higher than ° C. 3. 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 polyether and / or an aliphatic polyester. The sanitary napkin according to claim 1 or 2, wherein 4. 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 a polyester. The sanitary napkin according to claim 3, which is (ethylene / propylene) block polyglycol and / or polytetramethylene glycol. 5. The moisture-permeable resin sheet has a film thickness of 5
~ 100μm, moisture permeability 0.5g / 100cm ² ·
It is Hr or more, the water pressure resistance is 2 m or more, and the fir-proof strength is 30 min or more.
The sanitary napkin according to any one of 1.