JP2002233551A - Disposable wearing article with gelled adhesive layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an adhesive layer mounted on the skin contact surface of a disposable wearing article air-permeable. SOLUTION: The adhesive layer 11 to be fastened to the skin is mounted on the skin contact surface of the disposable wearing article 1 such as a sanitary napkin. The adhesive layer 11 is made of a gelled material comprising a crosslinked silicone compound and an oil compound with the melting point of 30 deg.C or lower and the boiling point of at least 101 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable wearing article having a gel-like adhesive layer formed on a part of a skin contacting surface.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. Hei 12-505701 discloses that
A topical adhesive for attaching a disposable absorbent product to the skin is disclosed. The adhesive comprises 45-99.5% by weight of a plasticizer compound, 0.5-20% by weight of a polymer compound soluble or swellable in the plasticizer compound, and 0-50% by weight of the polymer compound. And an adhesive resin.

[0003] Japanese Patent No. 2979724 discloses a sanitary napkin having a gel adhesive containing 1 to 30% by weight of a water-soluble polymer substance and 30% by weight or more of water on a skin contact surface.

[0004]

SUMMARY OF THE INVENTION The above-mentioned Japanese translation of PCT application No. 12-50
In the sanitary napkin in which the adhesive disclosed in Japanese Patent No. 5701 is applied to the skin contact surface, the polymer compound in the adhesive may contain a polystyrene component, which may cause the menstrual blood to coagulate relatively quickly. You. Menstrual blood that has clotted in the vicinity of the adhesive may have body hairs in it, and the replacement of the sanitary napkin in such a case is accompanied by particularly strong discomfort. Also,
Since this adhesive is not particularly considered for air permeability and moisture permeability, it may cause stuffiness or rash when it comes into close contact with the skin.

When a water-soluble polymer substance is contained as in the pressure-sensitive adhesive disclosed in Japanese Patent No. 2979724, an aqueous excrement such as menstrual blood penetrates the pressure-sensitive adhesive and oozes out of the sanitary napkin. And excrement that has penetrated may cause itching and rash.

[0006] These known adhesives and gel adhesives generally have low tear strength, and may be torn when repeatedly fixed to the skin.

According to the present invention, there is provided a disposable wearing article using a gel-like substance having adhesiveness to the skin, wherein the gel-like substance does not cause various problems as seen in the prior art. That is, there is no problem that the skin does not get stuffy or rash, and it does not break even after repeated fastening, and furthermore, it is an object to provide a disposable wearing article that is not easily replaced if it is a sanitary napkin. I have.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a contact surface for skin and a contact surface for clothing, and a gel surface for the contact surface for the skin. Is a disposable wearing article having an adhesive layer.

One of the features of the present invention in such a wearing article is that the pressure-sensitive adhesive layer has (1) a crosslinked silicone compound and (2) a melting point of 30 ° C. or less and 101 ° C.
It is formed of a gel-like substance composed of an oil compound having the above boiling point. Another feature of the present invention resides in that the pressure-sensitive adhesive layer has a large number of through holes penetrating in the thickness direction. Still another feature of the present invention is that the pressure-sensitive adhesive layer contains any one of a reinforcing nonwoven fabric and a reinforcing woven fabric in the layer.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sanitary napkin will be described as an example of a disposable wearing article according to the present invention with reference to the accompanying drawings.

A sanitary napkin 1 shown in a partially cutaway perspective view in FIG. 1 is a liquid-permeable topsheet 2 which comes into contact with a wearer's skin.
And a liquid-impervious back sheet 3 that comes into contact with the clothes of the napkin wearer, and a liquid-absorbent core 4 interposed between the two sheets 2 and 3, and has a front end 5a and a rear end 5b. The front and back sheets 2 and 3 extend from the peripheral edge of the core 4 and overlap, and are joined to each other in a watertight manner to form a pair of side edge flaps 6.
7 and front and rear edge flaps 8, 9 are formed. A gel-like adhesive layer 11 extending in a U-shape is formed on the upper surface of the top sheet 2 at the pair of side edge flaps 6 and 7 and the rear edge flap 9. Such a napkin 1
When the adhesive layer 11 is brought into close contact with the skin such that the front end 5a is located on the front side of the body, the adhesive layer 11 acts as fastening means for fixing the napkin 1 to the skin,
It also functions as leakage prevention means for preventing menstrual leakage from the side edge flaps 6, 7 and the rear edge flap a. In addition, the napkin 1 fixed in this manner follows the movement of the body well and does not separate from the skin, and thus has a high leak-proof effect in that sense. At the front end 5a, the adhesive layer 11 is not formed so as not to act on the body hair, but if necessary, the adhesive layer 11 can be extended to here.

For example, 1 to 8 g of methyl vinyl silicone, 1 to 8 g of methyl hydrogen silicone, 10 to 30 g of ester oil, and 0.1 to 1 g of a platinum catalyst are mixed and stirred in the pressure-sensitive adhesive layer 11. Fineness 1-8 dt
x, after uniformly applying a thickness of 0.5 to 4 mm on the top surface of the topsheet 2 made of a spunbond nonwoven fabric having a basis weight of 10 to 30 g / m ² , heating in an oven at 100 ° C. for 10 minutes,
Thereafter, a gel adhesive composed of a crosslinked silicone compound and an oil compound, which is obtained by cooling to room temperature, is used. Crosslinked silicone compounds include:
In addition to a crosslinked product of a vinyl group-containing silicone represented by the formula 1 and a methyl hydrogen silicone represented by the formula 2, an epoxy-modified silicone represented by the formulas 3, 4, and 5 is used. As the oil compound, a fatty acid ester of glycerin having a melting point of 30 ° C. or lower and being liquid at room temperature and a boiling point of 101 ° C. or higher is preferably used. For example, monoglyceride, diglyceride and triglyceride of glycerin and a fatty acid having C = 2 to 35 are used, and more preferably coconut oil fatty acid triglyceride is used. The pressure-sensitive adhesive layer 11 can also be obtained by adding an antimony-based catalyst to a mixture of an epoxy-modified silicone and an ester oil.

(Equation 1)

(Equation 2)

(Equation 3)

(Equation 4)

(Equation 5)

The pressure-sensitive adhesive layer 11 thus obtained is
By including silicone rubber, it acts to delay blood clotting when compared to those using polymeric materials such as polystyrene, polyethylene, polypropylene, polyethylene terephthalate. The fact that silicone rubber has the effect of delaying blood coagulation is described in, for example, I. Leiminger et al; An
n. NY Acad. Sci. , 146 , 3 (196
8). In the vicinity of the pressure-sensitive adhesive layer 11, menstrual blood does not immediately solidify, but is in a state where it can be absorbed by the core 4 for a relatively long time. Further, since the silicone compound and the oil compound are water-repellent, the pressure-sensitive adhesive layer 11 is not wetted by menstrual blood. As a result, menstrual blood flows through the core 4 at the side edges 6 and 7 of the napkin 1.
The possibility that hair is contained in the coagulated menstrual blood is reduced.

The pressure-sensitive adhesive layer 11 using the crosslinked silicone compound is also moisture-permeable, so that when it is brought into close contact with the skin, compared with when a non-moisture-permeable adhesive layer is brought into close contact with the skin. The effect of preventing stuffiness and rash is obtained. When the preferred pressure-sensitive adhesive layer 11 is formed with a thickness of 3 mm on one surface of a spunbonded nonwoven fabric having a fineness of 2 dtx, a basis weight of 22 g / m ² , and a polyethylene / polypropylene core-in-sheath composite fiber, which is the surface sheet 2. , 20g / m
^It has a moisture permeability of ² / 24h or more.

The pressure-sensitive adhesive layer 11 is also formed uniformly over the entire required area of the topsheet 2 as shown in the drawing so as to have high air permeability and to be easily elastically deformable. Instead, it may be formed so as to draw many stripes, spirals, dots, or the like, or to form a lattice pattern, or may be formed so as to have many through holes. Adhesive layer 11 integrated with topsheet 2
According to JIS K6400, the air permeability when the water column of the inclined manometer is set to 1.27 cm with the Frazier tester is 10 cc / cm ² / sec or more, and the ratio of the voids to the apparent volume is 10 to 10. Preferably, it is formed to be 90%. The fact that the adhesive layer 11 has many voids provides a space for the polymer adhesive forming the adhesive layer 11 to be easily deformed, and the voids are provided by the through holes. Then, the air permeability of the topsheet 2 is also improved. Moreover, the easily deformable pressure-sensitive adhesive layer 11 is soft and comfortable.

If the strength of the pressure-sensitive adhesive layer 11, for example, the tearing strength, is insufficient, a nonwoven fabric or a woven fabric for reinforcement may be included in the layer. These nonwoven fabrics and woven fabrics have a large fiber gap so as not to hinder the air permeability of the adhesive layer 11, and the adhesive layer 11
It is preferable to have an air-permeable through-hole penetrating through.
Such an adhesive layer 11 can be repeatedly fixed to the skin.

FIG. 2 is a partially cutaway perspective view of a sanitary napkin 31 different from FIG. 1 showing an embodiment of the present invention. The napkin 31 has front and rear edge portions 5 on both side edge portions 32.
a, 5b, an elastically stretchable leak-proof levee 33;
And a wing portion 36 extending to the side. The breakwater 33 is formed by bending a liquid-impervious sheet into a substantially Z-shape, and when the napkin 1 is bent in the front-rear direction as shown in the figure, at least the central part in the front-rear direction is elastically deformed. Shrink,
The upper surface 34 of the breakwater 33 moves upward in the drawing so as to abut against the wearer's skin. The gel-like adhesive layer 11 is formed on the upper surface 34, and the napkin 1 can be fixed to the skin by pressing the adhesive layer 11 against the skin. The wing portion 36 has an adhesive material (not shown) applied to the lower surface thereof, and is bent along the opening edge around the leg of the worn shorts, and then attached to the crotch outer surface of the worn shorts by the adhesive material on the lower surface. Be worn. Also in such a napkin 31, the adhesive layer 11 can prevent menstrual blood from leaking between the napkin 31 and the skin.

FIG. 3 is a partially broken plan view of a disposable diaper 51 showing an example of an embodiment of the present invention different from a sanitary napkin. The diaper 51 is made of a liquid-permeable topsheet 52.
, A liquid-impervious back sheet 53, and both sheets 52,
And a liquid-absorbent core 54 interposed between them. Diaper 5
At front and rear end portions 56 and 57 extending to the waist direction, a waist elastic member 58 is attached to either of the inner surfaces of the front and back sheets 52 and 53 in an extended state. At a side edge 61 extending in the front-rear direction of the diaper 51, a leg-surrounding elastic member 62 is attached to either the inner surface of the front and back sheets 52, 53 in an extended state. A leak-proof levee 63 extending in the front-rear direction is formed at a portion inside the leg-surrounding elastic member 62. An elastic member 66 is attached to the inner edge 64 of the breakwater 63 so as to extend in the front-rear direction. Leakage 6
When the diaper 51 is worn and bent in a U-shape in the front-rear direction when the diaper 51 is worn, the elastic member 66 contracts and rises from the inner surface of the diaper 1, and opens inward of the diaper 51 in cooperation with the topsheet 52. A pocket 65 is formed. In such a diaper 51, the front and rear edge portions 5 which come into contact with the wearer's skin
The gel-like adhesive layer 71 similar to the adhesive layer 11 of FIG.
Are formed. Adhesive layer 7 at front and rear edge portions 56 and 57
1 can fix the diaper 1 to the body in close contact with the waist of the wearer of the diaper 51 and can prevent body fluid leakage from the waist. The pressure-sensitive adhesive layer 71 of the leak-proof embankment 63 is substantially fixed in a state in which the inner edge 64 is fixed to the wearer's diaper portion or the like so that the leak-proof embankment 63 stands up from the inner surface of the diaper 51. Lateral leakage can be effectively prevented.

The adhesive layer 11 and the adhesive layer 71 used in the illustrated example are not suitable for washing and reuse, and in this sense, the present invention secures a specific portion to the body. In addition to the sanitary napkins 1 and 31 and the disposable diapers 51 to be used, it is preferable to use a disposable medical gown or other wearing article intended for disposable use.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The pressure-sensitive adhesive layer 11 used in the present invention comprises:
(1) adhesion performance to the skin, (2) menstrual adhesion, (3)
The quality is judged by the stuffiness prevention performance. The adhesion performance to the skin is evaluated by the difficulty of the adhesive layer 11 slipping on the artificial skin, the menstrual blood adhesion is evaluated by the ease of artificial menstrual flow in the adhesive layer 11, and the anti-stuffing performance is Assessed by humidity and skin conductivity. The test piece having the adhesive layer 11 to be evaluated was methyl vinyl silicone 4 g, methyl hydrogen silicone 4
g, 20 g of ester oil and 0.5 g of a platinum-based catalyst are mixed and stirred, and the resulting mixture is used as a top sheet 2 with a fineness of 2 d.
tx, uniformly applied to one surface of a spunbonded nonwoven fabric made of a polyethylene / polypropylene core-sheath composite fiber having a basis weight of 22 g / m ^{2 so as} to have a thickness of 3 mm,
Obtained by heating in a 10 ° C. oven for 10 minutes.

A. (1) Fastening performance to skin and (2)
Evaluation of menstrual blood adhesion FIG. 4 and FIG. 5 show a tester 21 for evaluating the fastening performance of a test piece composed of the topsheet 2 and the adhesive layer 11, and a tester 26 for evaluating the menstrual blood adhesion. FIG. These testers 21 and 26 are manufactured by Y.S. S. S. Generally available as a tester. The tester 21 has a slope 23 capable of changing the inclination angle 22 at a constant speed.
On the slope 23, an artificial skin 20 made by attaching a silk powder to a urethane sheet is stuck.
A metal plate 24 having a width of 5 cm, a length of 10 cm, and a thickness of 1 cm and weighing 500 g is placed on the artificial skin 20. On the lower surface of the plate 24, a test piece 25 in which the topsheet 2 and the adhesive layer 11 are integrated is provided with an adhesive layer 11.
Is attached so as to contact the artificial skin 20.
The slope 23 starts at 0 ° C. and starts at 1 °.
/ Sec, and the magnitude of the angle 22 when the plate 24 starts to slide becomes the fastening performance of the test piece 25.

The tester 26 shown in FIG. 5 is the same as that shown in FIG. 4 except that the surface sheet 2 having a size of 3 cm × 10 cm and the adhesive layer 11 are provided on the slope 23 instead of attaching the artificial skin 20. An integrated test piece 27 is attached with the adhesive layer 11 facing upward. At the right end of the test piece 27, menstrual blood 28 having a viscosity of 7.8 cp and
Is dropped at 0.2 g, and the inclination angle 29 increases at a rate of 1 ° / sec.
9 is required. Further, the amount of menstrual blood adhered to the test piece 27 is determined from the weight of the test piece 27 after the menstrual blood has flowed down. The test piece 27 has a determined inclination angle 29.
It can be said that the smaller the is, the less menstrual blood adheres. If the pressure-sensitive adhesive layer 11 of the napkin 1 in FIG. 1 does not easily adhere to menstrual blood, the menstrual blood flowing toward the side edge flaps 6 and 7 of the napkin 1 is repelled by the pressure-sensitive adhesive layer 11 and napkin 1 As a result, there is no leakage of menstrual blood from the side edge flaps 6,7.

B. (3) Evaluation of humid prevention performance Moisture permeability, one of the humid prevention performances, is determined by ASTM E96.
It is measured according to -66. The cup containing pure water was covered with a test piece with the adhesive layer 11 facing down,
Let stand at 0 ° C. and 90% relative humidity for 24 hours. Reduction of pure water while it was allowed to stand is a moisture permeability, g ^/ m 2/24
It is determined in units of h.

The skin conductivity, which is one of the anti-humidity properties,
The adhesive layer 11 of the test piece is brought into contact with the skin and left for 1 hour at a temperature of 20 ° C. and a relative humidity of 60%, and then the skin keratin conductivity (conductance) is measured in μs. The magnitude of the measured value indicates a large amount of moisture on the skin surface, and a larger value indicates that the test piece has poorer ventilation and moisture permeability and is inferior in the function of preventing stuffiness.

Table 1 shows the evaluation results of the test piece having the adhesive layer 11 as an example, and the evaluation results of the spunbonded nonwoven fabric used in this example as a blank.

[0026]

Comparative Example (1) Polyacrylic acid-Na polyacrylate
4 g of the copolymer, 1.5 g of aluminum hydroxide, 0.5 g of tartaric acid, 60 g of ion-exchanged water (pH 5.8) and 30 g of glycerin were mixed and stirred, and this was mixed on one surface of the same spunbond nonwoven fabric as used in the examples. After applying so as to have a thickness of 3 mm, it was left in an oven at 50 ° C. for 24 hours to obtain a test piece having a gel-like adhesive layer as a comparative example.
Table 1 shows the results of evaluation of this test piece in the same manner as in the example as Comparative Example 1. (2) 15% by weight of a styrene-isoprene-styrene block copolymer, 70% by weight of paraffin oil, and 15% by weight of a tackifier are heated and melted, and a thickness of 3 mm is formed on one surface of the same spunbonded nonwoven fabric as used in Examples. After being coated as described above, it was cooled to obtain a test piece having a gel-like pressure-sensitive adhesive layer as a comparative example. The results of evaluating this test piece in the same manner as in the example are shown in Table 1 as Comparative Example 2.

As is clear from Table 1, there is no significant difference in the fastening performance between the test piece of the example and the test pieces of Comparative Examples 1 and 2, but those of Comparative Examples 1 and 2 are liable to adhere menstrual blood. It does not have moisture permeability. When this is used as a material for fixing to the skin, the skin tends to be stuffy. With the pressure-sensitive adhesive layer in the examples, menstrual blood does not easily adhere even if it is brought into contact with the skin, and the skin is not stuffy or rash because of high moisture permeability and air permeability.

[0028]

[Table 1]

[0029]

The disposable wearing article according to the present invention is:
Since the gel-like adhesive layer having moisture permeability is used when fixing it to the skin, it is possible to prevent stuffiness and rash on the skin. Also, since this adhesive layer has a water repellency and a function of delaying blood coagulation, when this adhesive layer is used as a fastening material for the skin of a sanitary napkin, in the vicinity of the adhesive layer, Menstrual blood is well absorbed by the core material without coagulation, which prevents leakage of menstrual blood, stuffiness and rash caused by menstrual blood, and reduces discomfort when replacing napkins. When the pressure-sensitive adhesive layer has a nonwoven fabric or woven fabric for reinforcement in the layer, the tear strength of the pressure-sensitive adhesive layer is improved, and the fastening of the worn article can be repeated.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a sanitary napkin.

FIG. 2 is a partially cutaway perspective view of a sanitary napkin different from FIG.

FIG. 3 is a partially broken plan view of the disposable diaper.

FIG. 4 is a perspective view of a tester.

FIG. 5 is a perspective view of a tester.

[Explanation of symbols]

 Reference Signs List 1 worn article (sanitary napkin) 11 adhesive layer 31 worn article (sanitary napkin) 51 worn article (disposable diaper) 71 adhesive layer

Claims (7)

[Claims] 1. A disposable wearing article comprising a contact surface for skin and a contact surface for clothing, wherein the contact surface for skin has a gel-like adhesive layer, wherein the adhesive layer is (1) a crosslinked silicone. The above-mentioned wearing article characterized by being formed of a compound and a gel-like substance consisting of an oil compound having a melting point of 30 ° C. or lower and a boiling point of 101 ° C. or higher. 2. A disposable wearing article having a contact surface against the skin and a contact surface against clothes, and having a gel-like adhesive layer on the contact surface against the skin, wherein the pressure-sensitive adhesive layer has a thickness direction. The above-mentioned wearing article characterized by having a large number of through holes penetrating therethrough. 3. A disposable wearing article having a contact surface against the skin and a contact surface against clothing, and having a gel-like adhesive layer on the contact surface against the skin, wherein the adhesive layer is reinforced in the layer. The wearing article according to any one of the preceding claims, comprising any one of a nonwoven fabric for reinforcement and a woven fabric for reinforcement. 4. A contact surface against the skin is formed of a non-woven fabric, any moisture permeability though the combination of the said adhesive material layer and the nonwoven fabric of claims 1 to 3 is 20g / m 2 / ^24h or more The wearing article according to the above. 5. The wearing article according to claim 1, wherein the combined air permeability of the nonwoven fabric and the adhesive layer is 10 cc / cm ² / sec or more. 6. The wearing article according to claim 1, wherein the pressure-sensitive adhesive layer has a porosity of 10 to 90%. 7. The wearing article according to claim 1, wherein the crosslinked silicone compound is one of a crosslinked product of a vinyl group-containing silicone and methyl hydrogen silicone, and an epoxy-modified silicone.