JP2553351Y2 - Sanitary napkin - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sanitary napkin, and more particularly, to a sanitary napkin having a gel adhesive on the skin contact surface side, which has a reduced cooling sensation during wearing and a very little discomfort when worn. Things.

[0002]

2. Description of the Related Art A sanitary napkin is basically composed of a liquid-permeable surface material, a liquid-impermeable leakproof material, and a liquid-retentive absorber sandwiched between them. In recent years, with the development of technology, the absorption performance has been improved by introducing new materials such as absorbent polymers and film-type surface materials. On the other hand, to improve the performance of napkins made of these excellent materials, methods of stabilizing the mounting of napkins on shorts and preventing leakage have been studied.For example, the non-skin contact side of napkins By stabilizing the mounting by enlarging the area of the (back side) adhesive tape, and further extending flexible ear pieces from both ends in the width direction of the napkin and wrapping these ear pieces in shorts, it is even better. There has been proposed a method for stabilizing mounting and preventing leakage.

In order to further improve the leakage prevention effect, it has been proposed to provide an adhesive on the skin contact surface side of the napkin to prevent the napkin from shifting. For example, Japanese Utility Model Publication No. 55-37129 proposes a napkin characterized in that an adhesive material mainly composed of a silicone rubber-based substance is provided on a part of the napkin on the skin contact surface side. Japanese Utility Model Laid-Open Publication No. Sho 60-166323 proposes a napkin in which a double-sided tape is provided on the skin contact surface side.

However, the above-described method of stabilizing the mounting of the napkin and preventing leakage can effectively prevent leakage from the crotch, but has little effect on leakage due to displacement of the discharge point. In addition, the above-mentioned Japanese Utility Model Publication No. 55-371
Japanese Patent Publication No. 29 only describes that a specially processed silicone rubber-based substance is used as an adhesive, but does not disclose its adhesive properties. Not only silicone rubber-based materials, but rubber-based adhesive materials can be made from extremely strong to almost non-adhesive materials by blending. I don't think it will be. Especially,
Considering that the pressure-sensitive adhesive is used on the skin contact surface side of the napkin, the napkin described in the above-mentioned publication using the pressure-sensitive adhesive is not considered to be practical.

The above-mentioned Japanese Utility Model Publication No. Sho 60-166323 does not disclose the material and adhesive properties of the adhesive used for the double-sided tape. Assuming that a normal adhesive tape is used as the double-sided tape, the napkin having the adhesive tape on the skin contact surface side has good adhesion to the skin, but it is hardly considered that it can be easily detached, but it is considered to be practically usable. It cannot be provided.

As described above, various methods for preventing leakage have been proposed, but none of these methods is fully satisfactory, and the first complaint of the user regarding the sanitary napkin is that the user still suffers from the crotch or buttocks. It is a leak.

[0007]

Therefore, the present inventors have proposed a sanitary napkin which has solved the above-mentioned problems of the conventional products as 1 to 30% by weight of a water-soluble polymer substance and 0.1 to 0.1% of a crosslinking agent.
A sanitary napkin characterized by having a gel adhesive formed by gelling an adhesive composition containing 4% by weight and 30% by weight or more of water on the skin contact surface side has been proposed (Japanese Patent Application No. Hei.
No. 63857).

However, the sanitary napkin does not shift during wearing, has good adhesion to the body, can prevent leakage from the crotch and buttocks, can be easily attached and detached, and is sticky to the skin after attachment and detachment. Although the feeling does not remain, there is a problem that when the gel adhesive material comes into contact with the skin at the time of wearing, a cool feeling, a so-called cool feeling, is felt. Accordingly, an object of the present invention is to provide a sanitary napkin having a gel adhesive material on the skin contact surface side, in which the feeling of cooling at the time of wearing is reduced and the feeling of discomfort at the time of wearing is extremely small.

[0009]

The present invention is directed to a sanitary napkin having, on the skin contact surface side, a gel adhesive obtained by gelling an adhesive composition containing water, wherein the surface of the gel adhesive is provided. A sanitary napkin (hereinafter referred to as the first invention) refers to a sanitary napkin characterized in that a material containing no water is partially or entirely embedded with its surface exposed. Thereby, the above object has been achieved.

[0010] The present invention is also a sanitary napkin having a gel adhesive obtained by gelling a moisture-containing adhesive composition on the skin contact surface side, and a part or all of the surface of the gel adhesive. In addition, a sanitary napkin characterized by being embossed (hereinafter referred to as the second invention,
The above object has been achieved by providing the present invention).

[0011]

According to the sanitary napkin of the present invention, since the contact area between the gel adhesive and the skin is small, the cooling sensation during wearing is reduced, and the discomfort during wearing is extremely small.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The sanitary napkin of the present invention will be described below with reference to the drawings. 1 is a perspective view showing an embodiment of the sanitary napkin according to the first aspect of the present invention, FIG. 2 is a sectional view taken along the line II-II of the sanitary napkin shown in FIG. 1, and FIG. FIG. 4 is a perspective view showing another embodiment of the present invention, and FIG. 4 is a sectional view corresponding to FIG. 2 showing an embodiment of the sanitary napkin of the second invention.

First, an embodiment of the first sanitary napkin of the present invention will be described. The sanitary napkin 1 of the embodiment shown in FIGS. 1 and 2 has a liquid-permeable surface (skin-contacting surface) 6, a liquid-absorbent absorber 2, and a liquid-impermeable The leak-proof material 3 is laminated, and a sliding member 4 is disposed outside the liquid-impermeable leak-proof material 3, and the liquid-impermeable surface material 6 side (skin contact surface side) Has an adhesive base material 7
The gel adhesive material 5 is provided via the.

In the present embodiment, a particulate material 10 containing no water is embedded over the entire surface of the gel adhesive 5 with its surface exposed. Examples of the fine particle material 10 not containing water include inorganic and organic fine particles such as inorganic fillers such as titanium oxide, talc, and barium sulfate, polymer beads of polystyrene, and powder of polyethylene. These fine particles are scattered uniformly or partially concentrated on the surface of the gel adhesive material 5 by a feeder at the time of coating the gel adhesive material 5, and a separator sheet is superimposed thereon, and this is placed between rolls. By letting it pass, it can be embedded in the surface of the gel adhesive 5.

The sanitary napkin of the first invention is not limited to the embodiment shown in FIGS. 1 and 2 described above. For example, in the above-described embodiment, organic or inorganic fine particles are used as the material 10 containing no water. However, the present invention is not limited to this, and a net-like polymer material may be used. This net-like polymer material is laminated on the surface of the gel adhesive 5 when the gel adhesive 5 is applied, and further, a separator sheet is superimposed thereon, and this is passed between the rolls, so that the gel adhesive 5 5 can be embedded in the surface.

The arrangement of the gel adhesive 5 in which the water-free material 10 is embedded is not limited to the embodiment shown in FIGS. 1 and 2, and for example, as shown in FIG. The gel adhesive 5 may be arranged so that two vertical strips are formed on the surface material 6 side (skin contact surface side) of the sanitary napkin 1. Napkin 1
It is sufficient if it is disposed on the side of the skin contact surface.

Further, in the sanitary napkin according to the first aspect of the present invention, the occupied area of the above-mentioned water-free material 10 is set to be about 20 to 30% of the total surface area of the gel adhesive 5. Embedding is preferred. If the occupied area of the material 10 containing no water is too small, the effect of reducing the cooling sensation is insufficient, and if it is too large, the adhesive properties of the gel adhesive 5 are impaired.

Next, the sanitary napkin of the second invention will be described. The sanitary napkin 1 of the second embodiment of the present invention shown in FIG. 4 is different from the embodiment of the first embodiment of the present invention shown in FIGS. 1 and 2 in that instead of embedding a material 10 containing no water on the surface of the gel adhesive 5. , The surface of the gel adhesive 5 is embossed (1
1) Processed, and the rest is the same as the embodiment of the first invention shown in FIGS. 1 and 2.

The shape of the emboss 11 is a slit shape,
The shape may be an appropriate shape such as a lattice or a circle, and is not particularly limited. The embossing may be performed on a part of the surface of the gel adhesive 5 or on the entire surface thereof. However, when the sanitary napkin 1 is attached, the contact area between the gel adhesive 5 and the skin is reduced to the gel. It is preferable that the embossing is performed so as to be about 50 to 75% of the total surface area of the adhesive material 5. If the contact area is too small, the adhesiveness between the sanitary napkin 1 and the body will be impaired, and if it is too large, the effect of reducing the feeling of cooling will be insufficient.

The water-containing pressure-sensitive adhesive composition used as the material for forming the gel pressure-sensitive adhesive 5 in the above-described sanitary napkin of the present invention includes 1 to 30% by weight of a water-soluble polymer substance and 0.1 to 4 of a crosslinking agent. A pressure-sensitive adhesive composition containing 2% by weight or more and 30% by weight or more of water, particularly a pressure-sensitive adhesive composition containing 2 to 15% by weight of a water-soluble polymer substance, 0.2 to 2% by weight of a crosslinking agent and 40 to 70% by weight of water is preferable. . Hereinafter, this pressure-sensitive adhesive composition will be described.

In the above-mentioned pressure-sensitive adhesive composition, if the content of the water-soluble polymer substance is less than 1% by weight, the shape retention property as a gel cannot be maintained, and if it exceeds 30% by weight, the gel becomes hard and the tackiness becomes poor. Not granted. If the amount of the crosslinking agent is less than 0.1% by weight, crosslinking does not proceed, and if it exceeds 4% by weight,
Crosslinking is too strong, causing water separation. The water content is 30% by weight.
When the amount is less than the above range, the napkin cannot be easily attached or detached, and a sticky feeling remains on the skin after the napkin is attached or detached.

The above-mentioned pressure-sensitive adhesive composition will be further described.
As the water-soluble polymer substance, known substances can be used, for example, gelatin, polyacrylic acid, sodium polyacrylate, polyvinyl carboxy copolymer, polyvinyl alcohol, polyvinyl pyrrolidone / vinyl acetate copolymer, carboxymethyl cellulose, Examples include sodium alginate, methyl vinyl ether, and maleic anhydride copolymer.

The cross-linking agent for cross-linking the water-soluble polymer is not particularly limited.
Water-soluble polyvalent metal salts such as calcium chloride, magnesium chloride, aluminum chloride, ammonium alum, iron alum, aluminum-potassium sulfate, ferric sulfate, and magnesium sulfate are preferably used. Also, calcium hydroxide, ferric hydroxide, aluminum hydroxide, calcium carbonate, magnesium carbonate, calcium phosphate,
Poorly water-soluble or slightly water-soluble salts such as magnesium stearate, aluminum stearate, calcium citrate, barium sulfate, aluminum allantoinate, aluminum acetate, bismuth subnitrate and bismuth subgallate can also be used.

The water is preferably clean, preferably ion-exchanged water or distilled water. Further, in the pressure-sensitive adhesive composition, in consideration of processing stability, stability over time, water retention, flexibility, mold retention, etc., fillers, emulsifiers, water retention agents, oils, chelating agents, mold retention agents, and the like. It can be added as appropriate. As the filler, for example, kaolin, talc, titanium dioxide, bentonite, zinc white, light anhydrous silicic acid and the like can be used. Examples of the emulsifier include polyoxyethylene alkyl ethers, polyoxyethylene alkyl allyl ethers, polyoxyethylene derivatives, oxyethylene oxypropylene block polymers, sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, and glycerin fatty acid. Examples include nonionic surfactants such as esters, polyglycerin fatty acid esters, glycerin alkyl ethers, and polyglycerin alkyl ethers, and these can be used alone or in combination of two or more. Examples of the water retention agent include, for example, propylene glycol, glycerin, sorbitol, polyethylene glycol, sodium lactate, and the like, and these can be used alone or in combination of two or more. Examples of the oil component include liquid paraffin, silicone, vegetable oil, animal oil, alcohol fatty acid ester, and the like, and these can be used alone or in combination of two or more. Examples of the chelating agent include sodium edetate, ethylenediamine, and the like. Further, examples of the shape retaining agent include polymer substances such as polybutene, latex, acrylic resin emulsion, and vinyl acetate emulsion, and these can be used alone or in combination of two or more.

The gelation of the pressure-sensitive adhesive composition is performed by heating the pressure-sensitive adhesive composition at 40 to 45 ° C. for about 24 to 48 hours. By this heating, the water-soluble polymer substance in the adhesive composition is crosslinked, and the adhesive composition is gelled.

[0026]

[Effects of the Invention] The sanitary napkin of the present invention has a reduced cooling sensation at the time of wearing, has very little discomfort at the time of wearing, is in close contact with the body and does not shift during wearing, and leaks from the crotch and buttocks. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the first sanitary napkin of the present invention.

FIG. 2 is a cross-sectional view of the sanitary napkin shown in FIG. 1, taken along the line II-II.

FIG. 3 is a perspective view showing another embodiment of the first invention.

FIG. 4 is a sectional view corresponding to FIG. 2 showing an embodiment of the sanitary napkin of the second invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Absorber 3 Liquid-impermeable leakproof material 4 Sliding member 5 Gel adhesive material 6 Liquid-permeable surface material (skin contact surface) 10 Material not containing moisture 11 Emboss

Claims (4)

(57) [Scope of request for utility model registration] 1. A sanitary napkin having a gel pressure-sensitive adhesive obtained by gelling a water-containing pressure-sensitive adhesive composition on a skin contact surface side, wherein water is applied to part or all of the surface of the gel pressure-sensitive adhesive. A sanitary napkin characterized in that a material free of the sanitary napkin is embedded with its surface exposed. 2. The sanitary napkin according to claim 1, wherein the water-free material is organic or inorganic fine particles. 3. The sanitary napkin according to claim 1, wherein the material containing no water is a net-like polymer material. 4. A sanitary napkin having, on a skin contact surface side, a gel adhesive obtained by gelling an adhesive composition containing water, wherein part or all of the surface of the gel adhesive is embossed. A sanitary napkin characterized by being provided with.