JP2002291805A - Absorbable article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbable article continuing a deodorizing effect for a long time and having immediateness. SOLUTION: The absorbable article 1 comprises members, any of which contains a fiber material having a deodorizing substance made of an organic polymer material being substantially insoluble in water and having a functional group exhibiting a positive charge and a negative charge by ionizing in water and fixed to its surface. The member is disposed to be contacted with the liquid at a liquid absorbing time of the article 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an absorbent article having a deodorizing performance.

[0002]

2. Description of the Related Art In an absorbent article such as a sanitary napkin or an incontinence pad, a deodorant is fixed inside the article so that the odor derived from the absorbed body fluid leaks out. Attempts have been made to prevent this from occurring and to use it comfortably and with peace of mind. For example, JP-A-2-243329
Japanese Patent Application Laid-Open Publication No. H10-15064 describes a top sheet of an absorbent article having a first thin polymer layer having an opening and a second active thin layer made of a deodorant disposed on one surface of the first thin polymer layer. Have been. The top sheet is arranged such that the first thin polymer layer faces the skin and the second active thin layer faces the absorber, so that the liquid permeates the absorber, and The bad odor generated from the liquid absorbed in the water is not released to the outside. However, in this absorbent article, since activated carbon is used as a deodorant, once it is wetted by the liquid, the deodorizing effect is greatly reduced even though the deodorizing ability remains.

As is clear from the prior art, the drawbacks of the conventional absorbent article having a deodorant are summarized as follows. ~ 4. It becomes like. 1. If the deodorant gets wet, the deodorizing effect decreases and it cannot be used for a long time. A common method is to use a water-insoluble porous material such as activated carbon, zeolite, silica gel, etc. to quickly physically adsorb the odor (absorb and remove the odorous substance into the myriad of pores). When wet, the pores are closed and the deodorizing ability is greatly reduced, and the deodorizing ability cannot be maintained for a long time. 2. The position where the deodorant is added may be limited.
1. For the reason described above, it has been proposed to dispose the deodorant inside the absorbent layer, particularly near the superabsorbent resin, in order to make the deodorant wet with the body fluid as much as possible in order to express the predetermined deodorant performance ( In this case, the body fluid is mainly solidified and held in a jelly state inside the superabsorbent resin, and the deodorant is hardly wetted.) However, from the viewpoint of the intended use, it is advantageous that the deodorant is spread as uniformly as possible over the entire absorbent article, and the deodorant effect is difficult to manifest unless the environment is in good contact with the body fluid which is a source of malodor. . 3. Deodorant is easy to fall off. 2. For this reason, when the deodorant is spread, the inconvenience of falling off and coming out tends to occur. As a countermeasure against this, when the deodorant is fixed with various adhesives, the above-mentioned 1. If the deodorant falls under
The adhesive covers the surface and the deodorizing effect is greatly reduced. 4. The target odors are diverse. The odors excreted with body fluids are extremely diverse, for example, they are too many to be chemically decomposed or deodorized, making them virtually impossible.
In particular, amines and ammonia, which cause a raw odor, and organic acids, which generate a sweat odor, are perceived as an unpleasant odor even in a very small amount. Therefore, a deodorant capable of simultaneously removing these is required.

Accordingly, an object of the present invention is to provide an absorbent article having a deodorizing effect that lasts for a long time and has an immediate property. Another object of the present invention is to provide an absorbent article that can deodorize various odors even when the deodorant gets wet with body fluid. It is another object of the present invention to provide an absorbent article in which a deodorant is fixed at a location where the deodorant ability is most advantageous, with a fixing means that does not reduce the deodorizing ability.

[0005]

According to the present invention, there is provided an absorbent article having a liquid-permeable surface layer, a liquid-impermeable leak-proof layer, and a liquid-retentive absorbing layer disposed between the two. Any of the members constituting the absorbent article is substantially water-insoluble and is fixed on the surface with an organic polymer material having a functional group showing a positive charge and a negative charge when ionized in water. Wherein the member comprises:
The object has been achieved by providing an absorbent article arranged to come in contact with a liquid when the absorbent article absorbs liquid.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. In FIG.
1 shows a partially cutaway perspective view of a sanitary napkin as one embodiment of the absorbent article of the present invention. The sanitary napkin 1 of the present embodiment has a vertically long shape, and includes a top sheet 2 as a liquid-permeable surface layer, a back sheet 3 as a liquid-impermeable leak-proof layer, and a space between the two sheets 2 and 3. And an absorber 4 as a liquid-retaining absorbing layer interposed between the two. The top sheet 2 and the back sheet 3 extend from both side edges and front and rear ends of the absorber 4, and are joined and fixed at the extending portions by joining means such as heat sealing or hot melt adhesive. A hydrophilic and liquid-permeable transmission layer 5 is interposed between the top sheet 2 and the absorber 4. The transmission layer 5 is disposed so as to cover the entire upper surface of the absorber 4.

[0007] The top sheet of the napkin 1 of this embodiment is formed of a nonwoven fabric made of a predetermined fiber material. As the nonwoven fabric, an air-through nonwoven fabric, a spunlace nonwoven fabric, a spunbonded nonwoven fabric, or the like is used. These nonwoven fabrics may be subjected to a hydrophilic treatment. The absorber 4 is configured such that a mixture of pulp fibers and particles of a superabsorbent polymer is wrapped in tissue paper made from pulp fibers. The back sheet 3 has a three-layer structure (hereinafter referred to as S) in which a melt-blown nonwoven fabric made of a predetermined fiber material is laminated on both sides with a spunbond nonwoven fabric made of the same or different predetermined fiber material.
MS nonwoven fabric). This SMS nonwoven fabric has moisture permeability. The transmission layer 5 is made of a nonwoven fabric having hydrophilicity. The transmission layer 5 is a topsheet 2
It is used for the purpose of smoothing the transfer of the bodily fluid from the to the absorber 4 and suppressing the backflow of the liquid from the absorber 4. in this way,
In the napkin 1 of the present embodiment, the top sheet 2
Each of the absorber 4, the back sheet 3 and the permeable layer 5 includes a fiber material. Each of these four members,
At least a part of the napkin 1 is a member disposed at a portion that comes into contact with body fluid when the napkin 1 absorbs liquid.

In the napkin 1 of this embodiment, the surface of the fiber material contained in any one of the top sheet 2, the absorber 4, the back sheet 3 and the permeable layer 5 is substantially applied to the surface. A deodorant composed of an organic polymer material having a functional group that is water-insoluble and ionizes in water and exhibits a positive charge and a negative charge is fixed. The organic polymer material may be a substance having both a functional group having a positive charge and a functional group having a negative charge in a molecule, or a polymer material having a functional group having the positive charge and the negative charge. Or a kneaded product with a polymer material having a functional group having the following formula: In any case, the organic polymer material is an ionic deodorant. Therefore, the deodorant does not lose its deodorant effect even if it is covered with body fluid, unlike the deodorant which exhibits the deodorant effect by physical adsorption of activated carbon or the like. In addition, because it has both positive and negative charge functional groups, it is possible to remove both amines and ammonia, which are substances that show a positive charge when ionized, and organic acids, which are substances that show a negative charge when ionized. It is. As a result, a stable deodorizing effect is exhibited even when the napkin 1 is worn continuously for a long time. Further, the deodorant has an advantage that the deodorant effect has an immediate effect. Further, since the deodorant substance is fixed to the surface of the fiber material, it can be prevented from falling off. Further, since the deodorant substance is substantially insoluble in water, even if the napkin 1 absorbs liquid, its removal is prevented.

Further, since the deodorant is fixed to the surface of the fiber material, the deodorant caused by burying the deodorant is compared with a case where the deodorant is kneaded in the fiber material. There is an advantage that there is no possibility that the effect is reduced, and there is an advantage that a large amount of deodorant can be fixed to a fiber having a large surface area as compared with a case where the film is fixed to the surface of a film.

When the deodorant is contained in the top sheet 2, the top sheet 2 is made of a nonwoven fabric made of a fiber material having the deodorant fixed on the surface. The nonwoven fabric is, for example, polyethylene, polypropylene, a fiber material made of a thermoplastic resin such as polyethylene terephthalate or a natural or semi-synthetic fiber material such as cotton or rayon, the surface of the deodorant is fixed by a predetermined means,
The fibrous material to which the deodorant is fixed can be obtained as a raw material according to a usual nonwoven fabric manufacturing method. The top sheet 2 can have a basis weight of usually 12 to 60 g / m ² , particularly 16 to 30 g / m ² .

Since the deodorant substance is contained in the top sheet 2, the deodorant substance can directly contact the bodily fluid, which is a source of malodor, and an immediate deodorant effect is exhibited.
In addition, the odor generated from the body fluid absorbed by the absorber 4 can be contained, the odor is prevented from being filled in the clothing, and the wearer is less likely to perceive the odor.

When the top sheet 2 contains the above-mentioned deodorant substance, by causing the top sheet 2 to contain an antibacterial agent, the generation of offensive odor can be further reduced and the deodorizing effect is further enhanced. . As the antibacterial agent, silver-based, copper-based or zinc-based substances or salts thereof, and extracts of natural products such as perilla and wasabi can be used.

When the above-mentioned deodorant is contained in the absorber 4, the absorber 4 is formed by wrapping a mixture of pulp fibers and superabsorbent polymer particles having the deodorant fixed on the surface thereof in tissue paper. Either a pulp fiber or a mixture of particles of superabsorbent polymer is wrapped in a tissue paper made of pulp fiber having the deodorant fixed on the surface thereof. Or absorber 4
The mixture of pulp fibers having the deodorant substance fixed on the surface thereof and particles of the superabsorbent polymer may be constituted by being wrapped in tissue paper made of pulp fibers having the deodorant substance fixed on the surface. Good. Further, a nonwoven fabric containing a deodorant similar to the nonwoven fabric used for the above-described top sheet 2 may be provided as a part of the absorber 4.

Since the absorber 4 contains the above-mentioned deodorant substance, absorption of body fluid and deodorization of malodor generated from the body fluid are simultaneously performed, thereby preventing the inside of the dress from being filled with malodor. You.

When the deodorant is contained in the backsheet 3, the backsheet 3 includes a spunbonded nonwoven fabric made of a fiber material having the deodorant fixed to the surface.
It is composed of S nonwoven fabric. In this case, the deodorant substance may be contained in each spunbonded nonwoven fabric arranged on both sides of the meltblown nonwoven fabric, or may be contained only in one spunbonded nonwoven fabric. When only one spunbonded nonwoven fabric contains the deodorant substance, it is advantageous that the backsheet 3 is disposed so that the spunbonded nonwoven fabric faces the absorber 4 from the viewpoint of enhancing the deodorant effect. It is.

Since the backsheet 3 contains the above-mentioned deodorant, the body fluid that has reached the absorber 4 and the nonwoven fabric surface containing the deodorant in the backsheet 3 come into contact with each other, thereby exhibiting a deodorant effect. In particular, when the back sheet 3 is permeable to moisture as in the present embodiment, the malodor generated from the body fluid absorbed by the absorber 4 is prevented from being released to the outside through the back sheet 3. In addition, since the back sheet 3 is permeable to water vapor, an increase in humidity in the clothes is prevented, and a comfortable wearing feeling is obtained.

When the odor eliminating substance is contained in the permeable layer 5, the permeable layer 5, like the top sheet 2, can be used.
The deodorant is fixed to the fiber surface of the nonwoven fabric constituting the above. Therefore, as for the details regarding the transmission layer 5, the description described in detail regarding the above-described top sheet 2 is applied. By including the deodorant in the permeable layer 5, the same effect as in the case where the deodorant is included in the top sheet 2 is achieved.

The napkin 1 of the present embodiment having the deodorizing substance composed of the above-mentioned organic polymer material has an acetic acid gas deodorizing ability measured by the following method which is a measure of the deodorizing ability.
After 0 minute, the content is 10 ppm or less, particularly 6 ppm or less,
It becomes extremely excellent after 10 hours, such as 10 ppm or less, particularly 6 ppm or less. [Measurement method of acetic acid gas deodorizing ability] A sealed glass container of 900 ml was used, and
Eight microliters of acetic acid is introduced with a microsyringe, and napkin 1 is immediately placed in the glass container and sealed. At this time, the concentration (initial concentration) of the acetic acid gas in the glass container is about 20 ppm. After 30 minutes with sealing, open the lid slightly so that the gas does not escape out of the container,
The gas concentration is measured using a detector manufactured by Gastech Co., Ltd. The gas concentration after 3 hours is measured for another glass container prepared similarly. That is, 30 in the same glass container
Do not measure the gas concentration after minutes and after 3 hours. As the glass container to be used, a glass container having a capacity of 900 ml and capable of being sealed and having no odor attached thereto can be appropriately used. A wide-mouthed bottle is desirable from the viewpoint of easy insertion of the napkin 1 and easy gas suction. In addition to laboratory equipment such as a UM sample bottle (900 ml), a mayonnaise bottle (9
A general-purpose bottle such as (00 ml) can also be suitably used. In the present invention, the latter is used.

The deodorant is composed of a substantially water-insoluble organic polymer material as described above. Since the deodorant is insoluble in water, the deodorant does not dissolve in the body fluid and does not fall off, and the movement of the body fluid due to the deodorant swelling in a gel form does not occur, The deodorant and the body fluid come into contact efficiently. In particular, when the deodorant substance is fixed to the constituent fibers of the top sheet 2, the feeling of the top sheet 2 is not impaired, and when the deodorant substance is contained in the absorber 4, its absorption is not hindered, When it is contained in the back sheet 3, there is an advantage that the air permeability is not impaired.

Specific examples of the deodorant include polygalactosamine and chitosan (polyglucosamine), which are organic polymer materials having a functional group exhibiting a positive charge when ionized in water (hereinafter referred to as organic polymer material A). , Chitin, polyethyleneimine, polyaniline and the like. These high-molecular organic materials have an amino group as a functional group.
Among these, chitosan is particularly preferred in view of the stability as a polymer and the low odor of itself. The organic polymer material A has a weight average molecular weight of 5,000 to 500,
000 is preferable from the viewpoint of maintaining that the deodorant substance is insoluble in water. In addition, when the organic polymer material A has a large molecular weight up to the molecular weight, it is easy to form bulky porous structure particles, so that the surface area in contact with the body fluid increases and physical adsorbability is also exhibited, which is preferable. By using the organic polymer material A, for example, fatty acids are chemically adsorbed thereto, and electrically neutral molecules such as mercaptan are also adsorbed.

On the other hand, organic polymer materials having a functional group exhibiting a negative charge (hereinafter referred to as organic polymer materials B) include:
For example, polycarboxylic acids such as polyacrylic acid, polymethacrylic acid, polycrotonic acid, polyitaconic acid, and polymaleic acid are exemplified. These polycarboxylic acids have a carboxyl group as a functional group. Of these, polyacrylic acid or polymethacrylic acid, particularly polymethacrylic acid, which has a low acidity and is easily salt-exchanged with an acidic odorant, is preferred. In the organic polymer material B, some or all of the acid groups may be in the form of a salt. Examples of the salt include alkali metal salts such as lithium, sodium, and potassium, and alkaline earth metal salts such as calcium, and the like, and alkali metal salts such as sodium and potassium are preferable because they are inexpensive and have low odor. Further, in the organic polymer material B,
Some of the acid groups may be esterified. The organic polymer material B has a weight average molecular weight of 5,000 to 50.
It is preferable to be 000 from the viewpoint of maintaining that the deodorant substance is insoluble in water and the workability. By using the organic polymer material B, for example, amines and ammonia are chemically adsorbed thereto.

The organic polymer material A and the organic polymer material B are composed of the organic polymer material A and the organic polymer material B in a single molecule.
May be present. That is, a single molecule may contain a functional group showing a positive charge and a functional group showing a negative charge. Such a polymer material includes, for example, (1) a polymer having a functional group exhibiting a positive charge or a functional group exhibiting a negative charge, and a functional group exhibiting a negative charge or a functional group convertible into a functional group exhibiting a negative charge. A method of graft-polymerizing a polymerizable monomer having a positive charge functional group or a polymerizable monomer having a functional group convertible to a positive charge functional group, (2) a positive charge functional group or a positive charge functional group Copolymerization of a polymerizable monomer having a functional group capable of being converted to a functional group having a charge and a polymerizable monomer having a functional group capable of being converted to a functional group having a negative charge or a functional group having a negative charge (3) subjecting a polymer having a predetermined functional group to a glow discharge treatment or an electron beam irradiation treatment to convert the functional group into a positive charge functional group and a negative charge functional group. Can be. Further, the organic polymer material A and the organic polymer material B may be used as a mixture of the respective materials, or may be a material obtained by kneading and integrating the two. The weight ratio of both (organic polymer material A / organic polymer material B) is 0.5 / 99.5 to 9
9.5 / 0.5, particularly preferably 20/80 to 75/25, is preferable in that an excellent deodorizing effect is exhibited.

Each of the above organic polymer materials may be hydrophilic or hydrophobic, but if hydrophilic,
Since the body fluid can be easily guided into the napkin 1, the deodorizing effect is further enhanced.

The above-mentioned deodorant composed of each organic polymer material is fixed continuously or discontinuously on the surface of the fiber material. When the particles are fixed discontinuously in the state of particles, the average particle diameter is preferably 20 μm or less, particularly preferably 0.01 to 10 μm. The average particle size can be measured by observation with an electron microscope. When fixed in a film state, the film may be continuous or discontinuous.

The deodorant comprising the organic polymer material is
There is no particular limitation on the method of fixing to the fiber material. For example,
(1) The organic polymer material may be used alone or together with a binder.
(2) dispersing the organic polymer material in a solution (aqueous solution or organic solvent solution) containing a binder, and then contacting the fiber material with the fiber material to fix it on the surface of the fiber material Fixing method, (3) on the fiber surface,
A method in which a monomer or oligomer of the organic polymer material is polymerized and fixed on the surface in the form of a film.

In the case of using the method (1), the binder is attached to the fiber material in advance, or is mixed with the organic polymer material before use. In this case, processing such as heating and compression may not be used. When the binder is not used, the organic polymer material is fixed on the fiber surface by means such as heat treatment. When the method (2) is used, the solution is sprayed on the fiber material or the fiber material is immersed in the solution, and then the fiber material is dried to fix the organic polymer material on the fiber surface. The binder used in the methods (1) and (2) is not particularly limited,
Examples include a silicone-based binder, an acrylic-based binder, a urethane-based binder, a vinyl acetate-based binder, and various hot melts. In addition, a hydrophilic material and a hydrophobic material are appropriately used depending on the properties of the fiber material.

It is preferable that the binder is in the form of fine particles and is used for fixing the deodorant in the form of an aqueous emulsion stably dispersed in water. The reason is that the binder is in contact with the deodorant in the form of fine particles, so that the surface of the deodorant is not covered in a film-like manner,
This is because the deodorizing ability is not reduced. The binder in the form of fine particles preferably has an average particle size of 10 μm or less, particularly preferably 0.001 to 2 μm. As this type of binder, a silicone-based binder is preferable because of easy formation of an emulsion. In addition, when the silicone-based binder is applied to fix the deodorant on the top sheet 2 made of a nonwoven fabric, the nonwoven fabric improves the smoothness and feel of the nonwoven fabric. It is particularly advantageous.

The amount of the deodorant in the fibrous material having the deodorant composed of the organic polymer material fixed on the surface thereof is determined by the weight of the fibrous material (ie, the total weight of the fibrous material, the deodorant and the binder). ) To 0.01 to 10% by weight, especially 0.1
The content of from 5 to 5% by weight is preferable because the deodorizing ability is exhibited, the tactile sensation on the fiber surface is not affected, and the deodorant substance is hardly dropped off.

The amount of the binder used for fixing the deodorant substance to the fiber material is determined by the weight of the fiber material having the deodorant substance fixed on its surface (namely, the fiber material, the deodorant substance and the binder). Is preferably 0.01 to 10% by weight, particularly 0.02 to 2% by weight, based on the total weight of the fibers, since the fiber material is sufficiently fixed and the deodorant performance of the deodorant substance is not hindered. In particular, when a silicone-based binder is used as the binder and a deodorant substance is fixed to the top sheet 2 made of a nonwoven fabric, in order to also exert the effect of improving the feeling of the nonwoven fabric, it is necessary to use the binder with respect to the fiber material. It is particularly preferred that the amount is between 0.1 and 2% by weight.

In the napkin of the present embodiment, in addition to the above-mentioned deodorant, a second deodorant which adsorbs the substance by physical adsorption may be contained in the absorber 4. As a result, in addition to the acidic malodorous substance and the basic malodorous substance, neutral malodorous substances such as ester-based substances are also deodorized. Since a neutral malodorous substance is generated at an early stage after the body fluid is absorbed, even if a deodorant substance which does not have a long-lasting deodorizing effect and adsorbs the substance by physical adsorption is used together, the deodorant substance is not deodorized. The deodorizing effect of the odorous substance is sufficiently exhibited.

Examples of the second deodorant include activated carbon, zeolite, silica gel, activated alumina, and acid clay.

The second deodorant substance is 50 to 500% by weight based on the weight of the deodorant substance made of the organic polymer material.
In particular, it is preferable to use 100 to 200% by weight because it is appropriate to share the odor and deodorize the odor.

Since the second deodorant substance is generally a granular material, it must be contained in the absorber 4 in a state of being mixed with the pulp fiber and the particles of the superabsorbent polymer in the absorber 4. Is preferable from the viewpoint of preventing the falling off.

The present invention is not limited to the above embodiment. For example, in the embodiment, any one of the top sheet 2, the absorber 4, the back sheet 3, and the permeable layer 5 is configured to include the fiber material to which the deodorant is fixed. Then, another member configured to include the fiber material to which the deodorant is fixed is disposed between the top sheet 2 and the absorber 4 or between the back sheet 3 and the absorber 4 in the napkin 1. You may. Further, two or more members of the top sheet 2, the absorber 4, the back sheet 3, and the permeable layer 5 may include the deodorant.

In the above embodiment, the back sheet 3 is formed of the SMS non-woven fabric. Alternatively, the back sheet 3 is formed by laminating a non-woven fabric made of a fiber material having a deodorant substance fixed on the surface thereof and a liquid impermeable film. A back sheet made of a body may be used such that the non-woven fabric faces the absorber 4. In this case, the liquid impermeable film may or may not have moisture permeability.

In the above embodiment, the back sheet 3 has moisture permeability. However, the back sheet 3 may not have moisture permeability depending on the specific use of the absorbent article.

The absorbent article of the present invention is not limited to sanitary napkins, but can be applied to other absorbent articles such as panty liners, incontinence pads, disposable diapers and the like.

[0038]

EXAMPLES In the following examples, "%" means "% by weight" unless otherwise specified. Prior to Examples and Comparative Examples, deodorizing substances, binders and nonwoven fabrics used in Examples and Comparative Examples will be described.

(1) Preparation of deodorant substance (1-1) Preparation of deodorant substance 1 Chitosan [SK-10, manufactured by Koyo Chemical Co., Ltd., degree of deacetylation 85-88%, weight average molecular weight 130,000]
Water was added to 40 g to make 900 g. To this, 120 g of methacrylic acid was added and dissolved with stirring at 60 ° C. to prepare an aqueous solution of chitosan and methacrylic acid. To this aqueous solution, a solution prepared by dissolving 3 g of potassium persulfate in 100 g of ion-exchanged water was added, followed by stirring at 25 ° C. for 5 minutes. Further, to this solution, a 1.0% solution of sorbitan monolaurate in cyclohexane was added in a weight ratio of 1/1, and the mixture was reacted at 70 ° C. for 5 hours. Then, 1 kg of isopropyl alcohol was added and stirred, followed by solid-liquid separation. did. Thereafter, an operation of adding 500 g of isopropyl alcohol and performing solid-liquid separation was performed twice to obtain 50 times.
Drying under reduced pressure at ℃ gave fine particle powder. This fine particle powder is composed of a polymer material in which methacrylic acid is graft-polymerized on the molecular chain of chitosan. This fine particle powder was used as a deodorant.

(1-2) Preparation of Deodorant Substance 2 Chitosan [SK-10, manufactured by Koyo Chemical Co., Ltd., Deacetylation degree 85-88%, weight average molecular weight 130,000]
Water was added to 40 g to make 900 g. To this, 120 g of methacrylic acid was added and dissolved with stirring at 60 ° C. to prepare an aqueous solution of chitosan and methacrylic acid. To this aqueous solution, a solution prepared by dissolving 3 g of potassium persulfate in 100 g of ion-exchanged water was added, followed by stirring at 25 ° C. for 5 minutes. This aqueous solution was used immediately according to “(3-3) Production of nonwoven fabric 3” described later.

(1-3) Preparation of Deodorant 3 Powdered activated carbon [SGP (particle size: 2 μm or less) manufactured by Nimura Chemical Co., Ltd.] was used as a deodorant.

(2) Binder Binder 1 [TF-3500 (silicone binder) manufactured by Kitahiro Chemical] and Binder 2 [water-soluble polyvinyl alcohol manufactured by Wako Pure Chemical (completely saponified, polymerization degree 500)] Was used in accordance with “(3) Production of nonwoven fabric” described later.

(3) Manufacture of Nonwoven Fabric (3-1) Manufacture of Nonwoven Fabric 1 112 g of the deodorant and 12.5 g of the liquid of the binder 1 (the active ingredient is 5 g) are mixed while adding water, and the total amount is reduced to 1 kg. A suspension was prepared. A raw fabric of an air-through nonwoven fabric having a basis weight of 30 g / m ² and made of a core-sheath type composite fiber having a core of polyester and a sheath of polyethylene was immersed in this suspension. The raw nonwoven fabric was pulled out of the suspension, and excess liquid was squeezed out so that the weight of the suspension attached to the raw nonwoven fabric was the same as the weight of the raw nonwoven fabric. Next, the raw fabric nonwoven fabric was dried with hot air at 80 ° C. to obtain a nonwoven fabric 1 in which the deodorant substance was fixed on the fiber surface.

(3-2) Production of Nonwoven Fabric 2 In the same manner as in the above (3-1) except that 5 g of the binder 2 is used instead of the binder 1, the nonwoven fabric 2 having the deodorant substance fixed on the fiber surface is used. I got

(3-3) Production of Nonwoven Fabric 3 The raw nonwoven fabric used in the above (3-1) is 25 cm × 25
Cut to cm and spread on polypropylene bat. 0.1 g of the deodorant 2 is dropped on the nonwoven fabric,
Immediately rub the entire non-woven fabric so that it spreads throughout. At this time, latex gloves were worn. The nonwoven fabric was immediately put into a hot-air dryer, and the reaction and hot-air drying were performed simultaneously at 80 ° C. to obtain a nonwoven fabric 3 in which the deodorant substance was fixed on the fiber surface.
In the nonwoven fabric 3, no binder is used for fixing the deodorant substance to the fiber surface.

(3-4) Production of Nonwoven Fabric 4 A suspension containing 6.5 g of the deodorant 3/1 kg of water was prepared, and thereafter, a nonwoven fabric 4 was obtained in the same manner as in the above (3-1). .

(3-5) Production of Nonwoven Fabric 5 The raw nonwoven fabric used in the above (3-1) was used as it was. This is designated as nonwoven fabric 5.

Example 1 Fluff pulp 200 g / m
² and the superabsorbent polymer 60 g / m ² were mixed and piled, and the obtained stack was cut into a width of 70 mm and a length of 170 mm, and wrapped with absorbent paper having a basis weight of 20 g / m ^{2 to form} an absorbent. did. Nonwoven fabric 1 was used as the top sheet, and a film made of polyethylene and having a basis weight of 40 g / m ² was used as the back sheet. The top sheet and the back sheet each had a width of 75 mm and a length of 200 mm. The absorber is sandwiched between the top sheet and the back sheet, and between the top sheet and the absorber, a width of 75 mm and a length of 200 mm
Nonwoven fabric 5 was interposed as a permeable layer. The top sheet, the permeable layer and the back sheet were heat-sealed over the entire circumference to produce the sanitary napkin shown in FIG. On the outer surface of the back sheet, a plurality of rectangular hot melt adhesives for fastening the napkin to the shorts were applied. The width (length in the napkin width direction) of the adhesive was 55 mm, and the length (length in the napkin longitudinal direction) was 2 mm. Each adhesive is
Thirty pieces were applied at intervals of 3 mm over the length of the napkin.

Example 2 and Example 3 Nonwoven fabric 2 (Example 2) and nonwoven fabric 3 (Example 3) as top sheets
A sanitary napkin was obtained in the same manner as in Example 1 except that each was used.

[Comparative Example 1] Nonwoven fabric 5 as a top sheet
Was used and a sanitary napkin was obtained in the same manner as in Example 1 except that nonwoven fabric 4 was used as the permeable layer.

Comparative Example 2 A sanitary napkin was obtained in the same manner as in Example 1 except that the nonwoven fabric 5 was used for both the top sheet and the permeable layer.

[Evaluation of Performance] The nonwoven fabrics obtained in Examples and Comparative Examples were evaluated for the ability to prevent deodorants from falling off, the ability to remove acetic acid gas, and the ability to remove odors from napkins by the following methods. The results are shown in Table 1 below.

[Deodorant-preventing property of deodorant] The top sheet in Examples 1 to 3 and the permeable layer in Comparative Example 1
The test piece is cut out to 5 mm x 200 mm. Length 48
A plastic bag [Unipack L-4 manufactured by Nihon Co., Ltd.] of 0 mm x 340 mm width is precisely weighed in advance (four digits after the decimal point,
Measure to the order of 0.1 mg), put 10 pieces of the above test pieces in this bag, inflate them appropriately with air, and shake them 100 times. After shaking, all the test pieces were taken out of the bag, the bag was weighed again and the original weight was subtracted, and this value was defined as the amount of the deodorant substance dropped off. At the same time, the contents of the bag after shaking were spread on white paper and black paper and visually inspected, and whether or not the particles were dropped was visually observed according to the following criteria. The number of test pieces was five. ○ ・ ・ No dropped items were found. ×: powdery fallout was observed.

[Deodorizing Ability of Acetic Acid Gas] The deodorizing ability of acetic acid gas was measured according to the above-described measuring method.

[Deodorizing performance of napkin] 5 ml of physiological saline
A solution containing 80 microliters of acetic acid therein was poured into a napkin, and the napkin was immediately attached to a movable human body model. Next, the movable human body model was set at 100 steps / minute (50
(m / min) for 30 minutes. After that, the walking action of the human body model was stopped, the napkin was removed from the human body model and spread, and the nose was brought closer to the distance of about 10 cm from the top sheet side of the napkin to 18 monitors selected at random, and the smell was smelled, The deodorizing performance was evaluated according to the following criteria. The results were represented by the average score of a total of 18 people. The smaller the score, the higher the deodorizing performance. 1 Does not smell at all. 2 Smell very slightly, but not bothersome. 3 Slightly smells. 4 Smell is strong and cannot be put up.

Further, 10 monitors of each napkin were used on each of the above 18 monitors for 2 hours or more at the time of menstruation, and the feeling of use, deodorant properties and impression after use were evaluated according to the following criteria.

[Feeling of use] An item having the feeling closest to one's own feeling was selected based on the following criteria, and the average value was obtained. The smaller the value, the better the feeling of use. 1 Good feeling of use. 2 The feeling of use is slightly good. 3 Slightly stuffy and sticky. 4 I feel very stuffy and sticky.

[Deodorizing property] The odor during use was selected based on the following criteria, and the average value was taken. The smaller the value, the less the odor and the more comfortable. 1 Does not smell at all. 2 Almost no smell (sometimes smell). 3 Slightly smells. 4 I smell.

[Impression after use] Regarding the impression after use,
Based on the following criteria, we chose the one closest to our feelings and took the average value. The smaller the value, the better the impression. 1 Good. 2 Somewhat good. 3 Neither can be said. 4 Somewhat bad. 5 Bad.

[0060]

[Table 1]

As is evident from the results shown in Table 1, the napkins of the examples show that the deodorant substances hardly fall off. In addition to this, the napkin of Example 1 has a feeling of use,
It turns out that it is excellent in both the deodorant property and the impression after use. On the other hand, in the napkin of Comparative Example 1, it was found that a large amount of the deodorant was removed, and that the deodorizing property was reduced by absorbing the liquid.

[0062]

According to the absorbent article of the present invention, the deodorizing effect is maintained for a long time, and the instantaneous deodorizing effect is excellent. Further, according to the absorbent article of the present invention, various odors can be deodorized even when the deodorant is wetted by a body fluid. In particular, by using a binder in a fine particle state as a binder for a deodorant, it becomes easy to fix the deodorant without deteriorating the deodorizing ability of the deodorant.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a sanitary napkin as one embodiment of an absorbent article according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sanitary napkin (absorbent article) 2 Top sheet (surface layer) 3 Back sheet (leak-proof layer) 4 Absorber (absorbent layer) 5 Permeable layer

Continuation of the front page F term (reference) 3B029 BA18 BD22 4C003 AA27 HA01 4C098 AA09 CC03 CC19 DD23 DD25 DD27

Claims (6)

[Claims] 1. An absorbent article having a liquid-permeable surface layer, a liquid-impermeable leak-proof layer, and a liquid-retentive absorbing layer disposed between the two. Is comprised of a fibrous material having an organic polymer material having a functional group exhibiting a positive charge and a negative charge which is substantially insoluble in water and ionized in water, and on which a deodorant substance is fixed on the surface. An absorbent article, wherein the member is arranged so as to come in contact with a liquid when the absorbent article absorbs liquid. 2. The absorbent article according to claim 1, wherein the deodorant substance is fixed to the fiber material via a binder made of a silicone polymer. 3. Acetic acid in a 900 ml glass container.
The absorbent according to claim 1 or 2, wherein the acetic acid gas concentration in the container after introducing 08 microliters and then immediately placing the absorbent article in the container, sealing the container, and storing at 25 ° C is as follows. Goods. 10 ppm or less after 30 minutes and 10 ppm or less after 3 hours. 4. The method according to claim 1, wherein the organic polymer material is contained in a single molecule.
The absorptive article according to any one of claims 1 to 3, comprising a functional group having the positive charge and a functional group having the negative charge. 5. The organic polymer material is a mixture of a polymer compound having an amino group as a functional group having a positive charge and a polymer compound having a carboxyl group as a functional group having a negative charge, or Claim 1 which consists of a kneaded material
4. The absorbent article according to any one of 3. 6. The polymer substance having an amino group is polygalactosane, chitosan, chitin, polyethyleneimine or polyaniline, and the polymer substance having a carboxyl group is polyacrylic acid, polymethacrylic acid, polycrotonic acid, polyitacon. The absorbent article according to claim 4, which is an acid, polymaleic acid, or a salt thereof.