JP3129760B2 - Absorbent articles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention is, sanitary napkins, paper diapers, incontinence Pas head, surgical pad, about the body fluids absorbent article of breast milk sheet, and the like.

[0002]

2. Description of the Related Art In general, absorbent articles such as sanitary napkins and disposable diapers include an absorbent for absorbing liquids such as blood and urine, and a surface material covering the surface of the absorbent and applied to the skin. It is composed of a back material that covers the surface of the absorber and prevents liquid leakage. The surface material of the absorbent article is required to have a liquid absorption / transmission function for promptly transferring a liquid such as blood or urine to the absorber and causing the absorber to absorb the liquid. On the other hand, the absorber is required to have a function of quickly receiving and absorbing and retaining the liquid absorbed by the topsheet.

[0003] Such movement of the liquid from the topsheet to the absorber is realized only when the two are in close contact with each other, and if they are spaced apart from each other, the topsheet may be separated. Liquid transfer from the sheet to the absorption sheet is extremely reduced, causing liquid diffusion and liquid flow on the topsheet, thereby causing a liquid leakage. Such poor absorption caused by the separation of the topsheet and the absorber is particularly serious in the case of a film-type topsheet that does not itself have absorptivity (such as a perforated film net). Separation is a fatal problem as to whether or not it is effective as an absorbent article.

[0004] From such a viewpoint, various techniques have been proposed for preventing separation of the absorber and the topsheet, particularly in an absorbent article using a film type topsheet. For example, as shown in JP-A-57-1339 and JP-A-60-259261, fibers for liquid suction are integrated with a topsheet via an adhesive, and a liquid from the topsheet to the absorber is formed. There are techniques for smooth movement and integration with the absorber.

[0005]

In the above-mentioned prior art, it is possible to eliminate disadvantages caused by the fact that the porous film itself does not have absorptivity.
Since the absorber is not a sheet-like material, but only attaches discrete fibers to the topsheet, only a part of the fibers integrated with the topsheet is easily peeled off from the absorber body,
In essence, not only can the surface sheet and the absorber not be integrated, but also partially adhered fibers promote undesired liquid retention and diffusion on the surface sheet. There was an inconvenience of causing

Accordingly, an object of the present invention is to provide an absorbent article which is excellent in liquid absorption and can prevent liquid leakage after liquid absorption.

[0007]

According to the present invention, there is provided an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber located between these sheets. The adhesive is partially adhered to the absorbent body with an adhesive, the adhesive occupies an area of 70% or less with respect to the top sheet, and has a 180 ° peeling adhesive strength (J
ISC2107 test method) is Ri der less than 4000g, above
The absorbent body has a central absorbent portion and at least a use surface of the absorbent portion.
An absorbent sheet covering the side, the central absorbent portion and the upper
Make sure that the absorbent sheet is at least
Or embossed, and the above absorbent sheet
Has a wet strength (JISP8135 test method) of 50 g or more
By providing an absorbent article characterized by der Rukoto it is obtained by achieving the above object.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. As shown in FIG. 1, an absorbent article 1 according to the present invention is an absorbent article having a permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorber 4 located between these sheets. The top sheet 2 is partially adhered to the absorber 4 with an adhesive 5. Further, the pressure-sensitive adhesive 5 has an occupied area of 70% or less with respect to the top sheet 2 and has a 180 ° peeling adhesive strength (JISC2107).
Test method) is Ri der less 4000 g, the absorbent member 4,
The central absorber (center absorber) 4B and less of the absorber 4B
And an absorbent sheet 4A that covers the use surface side.
At least the central absorbent 4B and the absorbent sheet 4A are used
On the surface side, adhesive or embossed
The wet strength of the absorbent sheet 4A (JISP81
35 test method) is characterized in der Rukoto than 50 g.

[0009] Here, the JISC2107 test method is as follows.
It is generally used as an evaluation means to express the adhesive strength of an adhesive. An adhesive is applied on a PET film with a width of 25 mm, and this is pressed with a stainless steel plate and a rubber roller, and then peeled 180 °. The adhesive strength is evaluated by measuring the strength. The reason why the pressure-sensitive adhesive 5 needs to be partially disposed in the present invention is that the higher the occupied area ratio of the pressure-sensitive adhesive 5, the lower the area that can absorb the liquid, leading to poor absorption. In order not to hinder the inherent absorption performance of the adhesive article, the area occupied by the adhesive must be 70%.
%, Preferably 5 to 50%. In addition, the JISP8135 test method refers to paper and
Strength of paper or paperboard when water is wetted on paperboard (tensile strength
Commonly used as a means of evaluating
And the measurement of the tensile strength of the test piece by this test method.
Specifies the test piece in accordance with the provisions of JISP8135.
After immersion in water for the specified time and moistening,
Excluding JISP8113 before water change
Perform according to the test method.

[0010] The adhesive strength is, specifically, JISC21
07 180 degree peeling adhesive strength by the test method is 400
0 g or less, preferably 1000 to 3000 g. This is because, when the adhesive strength is 4000 g or less, the adhesion between the topsheet 2 and the absorber 4 is released when wet in a mounted state (under conditions under which various deformations are applied), but when it is more than 4000 g, it is not released when wet.

The absorber 4 integrated with the topsheet 2
Preferably, at least the surface layer on the use surface side is an absorbent sheet 4A, and more desirably, the absorbent sheet 4A is integrated at least on the use surface side via an embossing treatment or an adhesive. If the surface of the absorber that adheres to the top sheet 2 is not the absorbent sheet 4A, the central absorbent 4B
This is because there is a possibility that separation of the body sheet from the surface sheet 2 may occur, and undesirable body fluid may be retained near the surface sheet 2. On the other hand, if the topsheet 2 adheres to the absorbent sheet 4A of the absorbent body 4 and has a strength higher than the adhesive strength when wet, the absorbent article 1 absorbs body fluid, Before the wet state, the topsheet 2 and the absorber 4 are sufficiently adhered to form a passage for guiding the bodily fluid to the absorber 4 smoothly. The adhesion between the sheet 2 and the absorber 4 is peeled off, and it is possible to obtain an extremely high salat feeling without holding unnecessary body fluid on the surface.

In this case, the absorbent sheet 4A involved in adhesion
It is essential to completely peel off the surface sheet 2 without destruction at the time of wetting in order to further develop the above-mentioned sarat feeling on the surface. Further, in order to further develop the above-mentioned salat feeling, the wet strength of the absorbent sheet 4A is 50 g or more,
As a result of various studies, it has been further clarified that preferably 60 to 200 g is required.

In the present invention, the liquid-permeable topsheet 2 is
Various types can be used including those conventionally used as a surface sheet of an absorbent article, such as a dry or wet nonwoven fabric, a perforated film, a net, and the like. It is a perforated film net having no liquid absorbing property. In addition, the absorber 4 (absorbing sheet 4
A and the central absorbent 4B) are preferably those conventionally used generally as absorbents made of absorbent paper, pulp, superabsorbent polymer, etc., but are not limited thereto. is not.

The pressure-sensitive adhesive 5 that is important in the manifestation of the effects of the present invention is preferably a pressure-sensitive adhesive that has an adhesive strength of 4,000 g or less in a test according to JIS C2107 and easily loses its adhesion when wet. Is an acrylate polymer, vinyl acetate, acrylate copolymer, ethylene, olefin copolymer,
Various adhesive materials such as petroleum-based adhesive resin and ethylene-butadiene copolymer can be used, and more specifically, Topco P-618B manufactured by Toyo Petrolite Co., Ltd., Kanebo NSL
MO-916 manufactured by Nitta Gelatin Co., Ltd., and Nittite HT400ZB manufactured by Nitta Gelatin are preferably used. Of course, the pressure-sensitive adhesive is not limited to these, and is not limited as long as it satisfies the above-mentioned pressure-sensitive adhesive properties.

The method of applying the pressure-sensitive adhesive is not limited at all, as long as it is various coating methods generally used for coating the pressure-sensitive adhesive, such as spray coating and gravure coating. The amount of the adhesive to be applied varies depending on the application method. For example, when the above-mentioned Topco P-618B (Toyo Petrolite Co., Ltd.) is used as the adhesive and applied in a spiral shape as shown in FIG. / M ^{2 to} 50 g / m ² is optimal.

[0016]

According to the present invention, the surface sheet 2 and the absorber 4 are completely integrated by the adhesive 5 before the body fluid is absorbed and becomes wet after the absorbent article 1 is mounted,
Also, after the body sheet is once absorbed and the topsheet 2 and the absorber 4 are in a wet state and a passage through which the body fluid smoothly flows from the topsheet 2 to the absorber 4 is formed,
Of the top sheet 2 and the absorber 4
Are separated, and no liquid diffusion occurs between the topsheet 2 and the absorber 4.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail. Example 1 Using a perforated film made of polyethylene and having a basis weight of 30 g / m 2 as the topsheet 2, the center absorber 4 </ ^b > B of the absorber 4 was used.
A 0.3 g superabsorbent polymer was sprayed on a pulp having a basis weight of 260 g / m ² , and this was further dispersed into an absorbent sheet 4A (basal weight 20 g / m ² composed of 100% pulp, wet strength 80 g).
Wrapped in an absorbent paper) and compressed and integrated by embossing. As the back sheet 3, a sheet made of polyethylene and having a basis weight of 23 g / m ² was used, and the length was 200 m.
m and a width of 70 mm as shown in FIG. As shown in FIG. 5, Topco P-618B (Toyo Petrolite Co., Ltd., adhesive strength: 3010 g) was used as the pressure-sensitive adhesive 5 for bonding the topsheet 2 and the absorbent sheet 4A to a basis weight of 10 g / m ² .
As described above, the product 1 of the present invention was obtained by applying the composition in a spiral form by spraying, followed by pressure bonding and bonding.

Example 2 In Example 1, instead of using a perforated film as the topsheet 2, a nonwoven fabric made of polyethylene-polyester conjugate fiber having a basis weight of 20 g was used.
Q-916 (manufactured by Kanebo NSL Co., Ltd., adhesive strength 2850)
g) was used and a product 2 of the present invention was obtained in the same manner as in Example 1 except that the structure shown in FIG. 3 was used.

Example 3 In Example 1, TCF703 was used as the absorbing sheet 4A.
Using (Futamura Chemical Co. wet strength strength 320 g), instead of the pulp of the absorbent body 4B, basis weight 25 g / m comprising a superabsorbent polymer 0.5g of rayon pulp (70/30)
Used after sandwiches ² rayon paper, 4
Surface sheet 2, absorbent sheet 4A, absorbent sheet 4A
The adhesive between the absorbent body 4B and Topco P
-618B (Toyo Petrolite Co., Ltd. adhesive strength 3010
g) at a coating amount of 5 g / m ² , respectively, as shown in FIG.
After coating in a lattice pattern, each layer was adhered by pressure bonding to obtain product 3 of the present invention.

Comparative product 1 Comparative product 1 was obtained in the same manner as in Example 1, except that the topsheet 2 and the absorbent sheet 4A were not bonded. Comparative Example 2 In Example 1, Comparative Product 2 was obtained by directly bonding the topsheet 2 and the absorber main body 4B without using the absorbent sheet 4A.

Comparative Example 3 In Example 1, instead of the absorbent sheet 4A, a wet strength was used.
Force using absorbent paper of 20g, and the adhesion between the surface sheet 2 and the absorbent sheet 4A, acrylic adhesive instead of the adhesive 5 have use the (Mowinyl 810, Hoechst Co.)
A comparative product 3 was obtained in the same manner as in Example 1 except that it was adhered .

[0022] attached to the comparative examples with the above-described embodiment goods the following experiments were carried out and evaluated. The results are shown in Table 1 below.

[0023]

[Table 1]

(1) Method of Measuring Dynamic Absorption As shown in FIG.
After attaching the sanitary shorts 9
You. In this state, the model walks at a speed of 50 m / min.
Exercise 2 g of simulated blood every 3 minutes in test tube 1
0 and the test short before the shorts 9 leak.
The amount of liquid absorbed by the sample 11 was measured. Measure each sun
Each pull was performed at 5 points, and the average value was taken as the absorption amount. (2) Method for judging spreadability of surface liquid Movable female main part model in the same manner as the measurement method in (1) above
8, the test sample 11 is attached, and in this state, the simulated blood 3
g on the top sheet after walking for 5 minutes
The state of spreading was visually checked and determined according to the following. ：: Spreading of the liquid on the top sheet is better than that of the absorber
Obviously small. Δ: Spreading of the liquid on the top sheet is almost the same as that of the absorber
About the same. ×: Spreading of the liquid on the topsheet is clearer than that of the absorber
It is obviously big. (3) Judgment method of surface salat feeling In the same way as the judgment method of (2) above, 3 g of simulated blood in a walking state
Absorb the liquid and change the surface condition of the test sample after walking for 5 minutes.
Observation was made as follows. ：: There is almost no liquid residue on the topsheet and there is a feeling of sarat. Δ: Remaining liquid on the topsheet is slightly observed. ×: A large amount of liquid remains on the topsheet, giving a sticky feel.

From the results shown in Table 1, it is clear that the absorbent article of the present example has a larger dynamic absorption amount than the comparative example, and also has good surface spreading properties and salat feeling. That is, according to the present embodiment, it is possible to obtain an absorbent article that is excellent in liquid absorbency, excellent in leak prevention after absorbing liquid, and excellent in surface salat feeling. The present invention is not limited to the embodiments described above, and can be variously modified without departing from the gist of the present invention.

For example, as shown in FIG.
Is not limited to surrounding the absorber 4, but may be arranged only on the back side of the absorber. The method of applying the pressure-sensitive adhesive is not limited to a spiral application as shown in FIG. 5, but may be a lattice as shown in FIG. 6, a line as shown in FIG. 7, and a dot as shown in FIG. A similar effect can be obtained even if the composition is applied to a substrate.

Furthermore, the absorbent body is not limited to having the absorbent sheet 4A, but may be one in which a surface material is directly adhered to the central absorbent body 4B with the adhesive material 5.

[0028]

According to the absorbent article of the present invention, liquid absorption is excellent and liquid leakage can be prevented after liquid absorption.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating an example of a coating pattern of an adhesive.

FIG. 6 is a cross-sectional view showing another example of a coating pattern of an adhesive.

FIG. 7 is a cross-sectional view showing another example of a coating pattern of an adhesive.

FIG. 8 is a cross-sectional view illustrating another example of a coating pattern of an adhesive.

FIG. 9 is a perspective view of a movable female waist model used for the test of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Absorbent article 2 Top sheet 3 Back sheet 4 Absorber 5 Adhesive

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masayuki Toda 2-20-1, Godai, Utsunomiya-shi, Tochigi Prefecture (72) Inventor Yuji Inoue 4594, Hanagawa-shi, Haga-gun, Tochigi Prefecture 4594 (56) References 213401 (JP, A) JP-A-63-28003 (JP, A) JP-A-60-259261 (JP, A) JP-A-57-1339 (JP, A) JP-A-54-163137 (JP, A) 63-151130 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61F 5/44 A61F 13/15 A61F 13/49 A61F 13/56

Claims (2)

(57) [Claims] 1. An absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber located between these two sheets, wherein the top sheet is partially composed of the absorber and an adhesive. The pressure-sensitive adhesive has an occupied area of 70% or less with respect to the top sheet.
80 ° peel adhesion (JISC2107 test method)
There Ri Der below 4000 g, the absorbent body includes a central absorbent portion
An absorbing sheet for covering at least the use surface side of the absorbing portion;
Wherein the central absorbent portion and the absorbent sheet are at least
Adhesion with adhesive or embossing on the side of use
The wet strength of the absorbent sheet (JISP81
Absorbent article 35 test method) is characterized in der Rukoto than 50 g. 2. The absorbent article of claim 1 wherein the adhesive strength when wet between the topsheet and the absorbent sheet is equal to or less than 100 g.