JP2001038851A - Sanitary pad release sheet - Google Patents

Abstract

(57) Abstract: The present invention provides a release sheet for a sanitary pad that does not impair the adhesive strength of the pressure-sensitive adhesive layer of the sanitary pad and is excellent in water dissolvability. SOLUTION: The release sheet 1 of the sanitary pad of the present invention comprises:
A release sheet 1 of a sanitary pad A which is releasably laminated on a sanitary pad A via an adhesive layer 6. The release sheet 1 is separated from a water-soluble base material 11 by a water-soluble resin layer 12. Agent layer
13 is laminated and integrated with the water-soluble resin layer 12 inside, so that it has excellent water decomposability, and no unexpected situation such as clogging of a drain pipe occurs even when this release sheet is flowed into a toilet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sanitary napkin,
A release sheet of a sanitary pad that is releasably laminated on an adhesive layer laminated on the outer surface of a back material of a sanitary pad such as a vaginal absorbent pad or a pad for incontinent persons, and in particular, can be dumped in a flush toilet or the like. The present invention relates to a release sheet for a sanitary pad which is excellent in usability.

[0002]

2. Description of the Related Art Conventionally, a sanitary pad is attached to underwear on the outer surface of a back surface of a sanitary pad such as a sanitary napkin, a vaginal absorbent pad, a pad for incontinent persons, etc. so that the mounting position is not shifted. An adhesive layer is layered.

Prior to use of the sanitary pad, a release sheet is laminated on the pressure-sensitive adhesive layer of the sanitary pad so that the release sheet can be peeled off immediately before use. The layer is exposed, and the sanitary pad is fixed to the underwear using this adhesive layer.

[0004] However, the release sheet laminated on the pressure-sensitive adhesive layer of the sanitary pad so as to be releasable often has no water dissolving property, and there is a problem that such a release sheet cannot be flown into a flush toilet. there were.

In order to solve the above-mentioned problems, Japanese Patent Application Laid-Open No. 7-303671 discloses a release sheet for the sanitary pad, wherein a silicone oil is added to hydrolyzed paper obtained by mixing fibrous carboxymethylcellulose with papermaking fibers. There is disclosed a method in which a release agent obtained by applying one or more of cyclic silicon and volatile silicone oil is applied.

However, since the release sheet is formed by applying the release agent to hydrolyzed paper obtained by mixing papermaking fibers with fibrous carboxymethylcellulose,
A large amount of the release agent is absorbed inside the disintegrated paper, and the disintegrated paper, in which a large amount of the release agent is absorbed inside, is laminated on the adhesive layer for a long period of time. The release agent in the paper migrates to the pressure-sensitive adhesive layer side of the sanitary pad, and the adhesive force of the pressure-sensitive adhesive layer of the sanitary pad decreases, or the release sheet is absorbed because a large amount of the release agent is absorbed. There was a problem that water disintegration was reduced.

[0007]

SUMMARY OF THE INVENTION The present invention provides a release sheet for a sanitary pad which does not impair the adhesive strength of the adhesive layer of the sanitary pad and which is excellent in water disintegration.

[0008]

A release sheet for a sanitary pad according to claim 1 is a release sheet for a sanitary pad which is releasably laminated on a sanitary pad via an adhesive layer. Is characterized in that a water-soluble resin layer and a release agent layer are laminated and integrated on a water-disintegrable substrate with the water-soluble resin layer inside.

The release sheet for a sanitary pad according to the second aspect is the release sheet for a sanitary pad according to the first aspect, wherein the release agent layer comprises a dimethylsiloxane / methylvinylsiloxane copolymer and a polymethylhydrogensiloxane. And silicone in the presence of a platinum catalyst.

[0010]

The release sheet of the present invention is excellent in water dissolvability since a water-soluble resin layer and a release agent layer are laminated and integrated on a water-disintegrable substrate with the water-soluble resin layer inside. To be processed.

In order to form the release agent layer on the water-soluble resin layer, a release agent constituting the release agent layer is applied on the water-soluble resin layer and cured. However, unlike the case where the release agent is applied on a water-disintegrable substrate, the release agent does not impregnate the water-soluble resin layer, so that the release agent is placed on the water-soluble resin layer. It is extremely thin and can be applied uniformly without unevenness.
The obtained release agent layer can be formed to be extremely thin and to have a uniform thickness.

Therefore, although the release agent layer has water repellency, its thickness is extremely thin, so that it hardly affects the water disintegration property, and the water release property of the release sheet is not reduced. Demonstrates excellent release properties to the pressure-sensitive adhesive layer. In addition, since the release agent layer has a small thickness and the amount of the release agent is extremely small, the release agent unexpectedly migrates to the pressure-sensitive adhesive layer side of the sanitary pad, and the pressure-sensitive adhesive There is no problem of losing power.

Further, since the water-soluble resin layer is covered on both sides by a water-decomposable base material and a release agent layer and is shielded from air, the water-soluble resin layer is protected from moisture in the air. There is no such an unexpected situation that the release sheet breaks unexpectedly when the release sheet is released from the pressure-sensitive adhesive layer of the sanitary pad due to the absorption of the adhesive sheet or the decrease in tensile strength.

Moreover, since the water-soluble resin layer is covered on both sides with a water-disintegrable base material and a release agent layer, even if the water-soluble resin layer is flushed into a toilet,
Most of them are sandwiched between the release agent layer and the water-disintegrable base material and surrounded, and do not come into direct contact with the surface of the toilet bowl. It does not stick to the surface of the toilet and unintentionally contaminate the toilet surface.

The water-decomposable base material contains a release agent inside the water-decomposable base material since a water-soluble resin layer is laminated on one surface thereof and the release agent layer is not directly laminated. And thus has excellent water dissolving properties.

As described above, the release sheet is formed by laminating and integrating the water-soluble resin layer and the release agent layer on the water-disintegrable base material with the water-soluble resin layer inside. In addition, the thickness of the release agent layer is reduced so that the water-disintegrability of the water-soluble base material and the water-soluble resin layer is maintained so that the water-disintegration property hardly deteriorates. Is coated with a water-decomposable base material and a release agent layer to prevent stickiness and decrease in mechanical strength by absorbing moisture by blocking from moisture in the air, and to have excellent usability. Therefore, even when the release sheet is in the water-disintegrated state, the water-soluble resin layer is surrounded by the water-disintegrable base material and the release agent layer in water, and the water-soluble resin constituting the water-soluble resin layer is unexpected. Accidentally contaminating the toilet by sticking to the toilet surface No.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a release sheet for a sanitary pad of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the release sheet 1 of the sanitary pad of the present invention allows liquids such as body fluids, blood, and urine to pass therethrough, and gradually becomes narrower toward the center. The formed surface material 2 having a substantially vertically elongated planar shape and a substantially vertically elongated surface material having the same shape and the same size as the surface material 2 which have been waterproofed so that liquids such as bodily fluids, blood, and urine do not pass therethrough. The absorbing material 5 is housed in the housing 4 formed by vertically overlapping the rectangular backing material 3 with the opposing peripheral portions of the front and backing materials 2 and 3 integrated by heat fusion or an adhesive. A release sheet of a sanitary pad which is releasably laminated on the surface of an adhesive layer 6 partially layered at predetermined intervals in the length direction on the outer surface of the back material of the sanitary pad A formed as described above, The release sheet 1 is separated from the water-soluble resin layer 12 on the water-decomposable base material 11. The mold agent layer 13 is laminated and integrated with the water-soluble resin layer 12 inside, and the shape is substantially the same plane shape and the same plane size as the sanitary pad A.

The water-decomposable substrate 11 constituting the release sheet 1
Is not particularly limited as long as it dissolves in water or entangles the fibers so that the fibers are separated from each other, for example, a non-woven fabric made of a water-soluble fiber or a water-decomposable fiber is used. Can be Examples of the water-soluble fibers or water-disintegrable fibers include, for example, pulp, rayon, cupra, cotton, hemp, wool, silk, polyvinyl alcohol, polyethylene, polypropylene, polyester, nylon, vinylon, and the like. Lumber 11
Because of its excellent water disintegration properties, short cellulosic fibers such as pulp and cotton are preferred.

The water-decomposable substrate 11 may have the water-soluble fibers or the water-decomposable fibers bound together by a water-soluble binder. Such a water-soluble binder is not particularly limited. , Polyvinyl alcohol;
Cellulose derivatives such as methylcellulose and hydroxyethylcellulose; starch; sodium alginate; sodium polyacrylate;

The water-decomposable substrate 11 preferably has a water-decomposability of 100 seconds or less. In addition, the water-disintegrable property of the water-disintegratable substrate 11 is one measured in accordance with JIS B0601.

Further, if the basis weight of the water-disintegrable base material 11 is large, the strength and stiffness are increased, and it may be difficult to peel off from the pressure-sensitive adhesive layer of the sanitary pad. 10 to 8
Preferably ^{0g / m 2, 12~35g / m} 2 is more preferable.

The appearance of the water-disintegrable substrate 11 may be improved by performing printing for decoration, embossing, or the like.

Next, the synthetic resin constituting the water-soluble resin layer 12 which is integrally laminated on one surface of the water-decomposable substrate 11 is not particularly limited as long as it is water-soluble.
Examples thereof include polyvinyl alcohol and modified products thereof, polyacrylamide, polyacrylic acid and derivatives thereof, polyethylene oxide, and vinyl ether polymers, and polyvinyl alcohol is preferable.

On the other hand, if the basis weight of the water-soluble resin layer 12 is large, the water-dissolvability of the obtained release sheet 1 may decrease. The resin layer 12 cannot be laminated, and a part where the water-soluble resin layer is not laminated occurs on a part of the water-disintegrable substrate 11, and the release agent permeates into the water-disintegratable substrate 11. Water release properties of the release sheet obtained by
Preferably ^{0g / m 2, 10~35g / m} 2 is more preferable.

The surface of the water-soluble resin layer 12 may be subjected to matting or embossing to improve surface slipperiness and decrease surface tackiness.

The method for integrally laminating the water-soluble resin layer 12 on the water-decomposable substrate 11 is not particularly limited. For example, the water-soluble resin layer is formed on the water-decomposable substrate 11. A method of extruding and laminating a synthetic resin film,
A method in which a synthetic resin film constituting a water-soluble resin layer manufactured in advance is thermally fused onto the water-disintegrable base material 11 with a hot roll or the like is used.

Further, a release agent layer 13 is formed on the water-soluble resin layer 12.
Are integrally laminated over the entire surface, but the release agent constituting such a release agent layer 13 is not particularly limited, and examples thereof include thermosetting silicone, ultraviolet ray or electron beam curing silicone, and the like. Silicone release agents, fluorine release agents, long-chain alkyl release agents, etc., but silicone release agents are preferred, and dimethylsiloxane / methylvinylsiloxane copolymer and polymethylhydrogensiloxane Is more preferably obtained by curing by reacting the compound in the presence of a platinum catalyst.

As a method of laminating the release agent layer 13 on the water-soluble resin layer 12, for example, the brush is impregnated with the release agent and applied onto the water-soluble resin layer 12 or the brush is released. The release agent is spray-coated on the water-soluble resin layer 12 to apply a release agent in a thin film on the water-soluble resin layer 12, and the release agent is heated or irradiated with ultraviolet rays or electron beams. And then cured to form the release agent layer 13.

On the other hand, if the basis weight of the release agent layer 13 is large, the water release property of the obtained release sheet may be reduced, or the curing of the release agent may be insufficient. In some cases, the release agent layer cannot be formed uniformly on the water-soluble resin layer 12, so that the thickness of the release agent layer is 0.05 to 2.0 g / m2.
² is preferable, and 0.1 to 0.5 g / m ² is more preferable.

Further, the outer surface of the release sheet 1 is
As shown in FIG. 2, a package sheet 7 having a vertically long rectangular shape and having a size slightly larger than the size of the sanitary pad A is integrally provided. This packaging sheet 7 is not particularly limited as long as it has water disintegration properties.
A sheet having the same configuration as the release sheet 1, a sheet made of the water-disintegrable base material 11 of the release sheet 1, and the like,
A sheet having the same configuration as the release sheet 1 is preferable.

The method for integrating the release sheet 1 and the packaging sheet 7 is not particularly limited. For example, an adhesive that can bond the release sheet 1 and the packaging sheet 7 is used. And a method of integrating the release sheet 1 and the packaging sheet 7 with each other.

As shown in FIG. 4, the sanitary pad A having the packaging sheet 7 integrally provided on the outer surface of the release sheet 1 is folded in three in the vertical direction as shown in FIG. Can be covered with the wrapping sheet 7 to prevent the sanitary pad A from being accidentally contaminated when being carried in a bag or the like.
Can be used hygienically.

However, in order to use the sanitary pad A, when the packaging sheet 7 is folded in three and the sanitary pad A is covered inside,
First, the packaging sheet 7 is expanded in the vertical direction so that the sanitary pad A covered in the packaging sheet 7 is exposed.

Thereafter, the packaging sheet 7 is pulled in the direction away from the sanitary pad A, and the adhesive sheet of the sanitary pad A is released together with the release sheet 1 integrating the packaging sheet 7 with the packaging sheet 7. 6 Peel and remove from the surface. Since the packaging sheet 7 and the release sheet 1 separated from the sanitary pad A both have water disintegration properties, they can be flushed to a toilet for processing.

In the above embodiment, the release sheet 1 is formed to have substantially the same shape and the same size as the sanitary ware A. However, as shown in FIG. May be formed in the shape of a plane vertically long rectangle slightly larger than the size of the sanitary pad A like the packaging sheet 7.

As described above, if the release sheet 1 is formed in a vertically long rectangular shape slightly larger than the size of the sanitary pad A, the packaging sheet 7 is integrally formed on the outer surface of the release sheet 1. Without providing, the sanitary pad A is folded in three in the longitudinal direction so that the sanitary pad A
Is covered with the release sheet 1 and is carried in a bag or the like in the same manner as described above when carrying the sanitary pad A.
Is reliably prevented from being accidentally contaminated, and the sanitary pad A can be used hygienically.

[0037]

EXAMPLES Example 1 A nonwoven fabric having a basis weight of 25 g / m ² was prepared using pulp as a water-decomposable fiber and polyvinyl alcohol as a water-soluble binder, and this nonwoven fabric was used as a water-decomposable substrate. Next, polyvinyl alcohol (degree of polymerization =
600, saponification degree = 98%, melting point = 190 ° C.) by extrusion lamination with a basis weight of 15 g / m ^{2 over the} entire surface of the water-disintegrable substrate, thereby forming a water-soluble resin layer integrally on the water-disintegratable substrate. Laminated.

Platinum-added silicone (trade name “KS-5508” manufactured by Shin-Etsu Chemical Co., Ltd.) is formed on the entire surface of the water-soluble resin layer.
A mold release agent obtained by stirring and mixing 100 parts by weight and 5 parts by weight of a platinum catalyst was applied at a coating amount of 0.8 g / m ² on a solid basis, and then irradiated with ultraviolet rays (high-pressure mercury lamp). By curing, a release agent layer was formed on the water-soluble resin layer to obtain a release sheet for a sanitary pad.

Example 2 A nonwoven fabric having a basis weight of 15 g / m ² was prepared using pulp as the water-decomposable fiber, and this nonwoven fabric was used as a water-decomposable substrate. Next, a polyvinyl alcohol (degree of polymerization = 600, degree of saponification = 98%, melting point = 190 ° C.) is extrusion-laminated on the entire surface of the water-disintegrable base material at a basis weight of 15 g / m ² , so that the above-mentioned water-disintegrable base material is exposed. Was integrally laminated with a water-soluble resin layer.

A platinum-added silicone (trade name “KS-3705” manufactured by Shin-Etsu Chemical Co., Ltd.) is formed on the entire surface of the water-soluble resin layer.
A release agent obtained by stirring and mixing 100 parts by weight and 5 parts by weight of a platinum catalyst was applied at a coating amount of 0.3 g / m ² on a solid basis, followed by irradiation with ultraviolet rays (a high-pressure mercury lamp). By curing, a release agent layer was formed on the water-soluble resin layer to obtain a release sheet for a sanitary pad.

Example 3 A nonwoven fabric having a basis weight of 15 g / m ² was prepared using pulp as the water-decomposable fiber, and this nonwoven fabric was used as a water-decomposable base material. Next, a polyvinyl alcohol (degree of polymerization = 600, degree of saponification = 98%, melting point = 190 ° C.) is extrusion-laminated on the entire surface of the water-disintegrable base material at a basis weight of 15 g / m ² , so that the above-mentioned water-disintegrable base material is exposed. Was integrally laminated with a water-soluble resin layer.

A platinum-added silicone (trade name “KS-5508” manufactured by Shin-Etsu Chemical Co., Ltd.) 1 is coated on the entire surface of the water-soluble resin layer.
A release agent obtained by stirring and mixing 00 parts by weight and 5 parts by weight of a platinum catalyst was applied at a coating amount of 0.2 g / m ² on a solid basis, followed by irradiation with ultraviolet rays (high-pressure mercury lamp). By curing, a release agent layer was formed on the water-soluble resin layer to obtain a release sheet for a sanitary pad.

Comparative Example 1 A nonwoven fabric having a basis weight of 20 g / m ² was prepared using pulp as the water-decomposable fiber, and this nonwoven fabric was used as a water-decomposable base material. Next, platinum-added silicone (Shin-Etsu Chemical Co., Ltd. product name “K
S-3705) A release agent obtained by stirring and mixing 100 parts by weight of a platinum catalyst and 5 parts by weight of a platinum catalyst is applied at a coating amount of 1.0 g / m ² on a solid basis, followed by ultraviolet rays (high pressure mercury lamp) Irradiation and curing to form a release agent layer to obtain a release sheet for a sanitary pad.

The release force and water disintegration of the release sheet obtained as described above were measured in accordance with the following methods.
It was shown to.

(Peeling force) An acrylic pressure-sensitive adhesive tape (trade name "31B" manufactured by Nitto Denko Corporation) was reciprocated once with a 2 kg rubber sticking roller, stuck to the release sheet, left for 30 minutes, and then adhered according to JISZ0237. The tape peeling force was measured and used as the peeling force.

(Water disintegration) A 300 ml beaker containing 300 ml of water at a water temperature of 20 ° C. was placed on a magnetic stirrer, and the rotation speed of the rotor placed in the beaker was adjusted to 600 rpm. I do.

Then, a release sheet having a flat square shape of 114 mm square was put into the beaker. At this time, the rotation speed of the rotor is reduced by the resistance of the release sheet, but the rotation speed is restored as the release sheet is hydrolyzed. At this time, the time from when the release sheet was put into the beaker to when the rotor in the beaker recovered to 540 rotations / minute was measured, and the time was regarded as water dissolvability.

[0048]

[Table 1]

[0049]

The release sheet of the sanitary pad of the present invention is a release sheet of a sanitary pad which is laminated on a sanitary pad via a pressure-sensitive adhesive layer so as to be releasable. Since the water-soluble resin layer and the release agent layer are laminated and integrated with the water-soluble resin layer on the inside, it has excellent water dissolvability, There is no unforeseen situation, such as clogging of drain pipes.

Moreover, since the release sheet has excellent mechanical strength and stiffness because the water-soluble resin layer is laminated on the water-disintegrable base material, it can be easily and easily removed with a fingertip when peeled from the adhesive layer of the sanitary pad. The release sheet can be reliably picked,
The peeled sheet can be smoothly and reliably peeled from the pressure-sensitive adhesive layer of the sanitary pad without breaking the picked release sheet.

Further, since the water-soluble resin layer of the release sheet is covered on both sides by the release agent layer and the water-disintegrable base material and is shielded from the air, moisture in the air is prevented. No unforeseen events such as unexpected absorption and stickiness or reduction in mechanical strength do not occur.Therefore, hands are contaminated when the release sheet is peeled from the adhesive layer of the sanitary pad, or the release sheet is There is no unexpected situation such as breakage on the way.

Further, since the release agent layer of the release sheet has a uniform thickness and is formed without unevenness, the release agent layer is excellent in not causing zipping to the pressure-sensitive adhesive layer of the sanitary pad. Demonstrates peelability.

Next, the release sheet for a sanitary pad according to the second aspect is the release sheet according to the first aspect, wherein the release agent layer comprises a dimethylsiloxane / methylvinylsiloxane copolymer and polymethylhydrogen. Since it is made of silicone obtained by curing by reacting gensiloxane with a platinum catalyst in the presence of a platinum catalyst, it has excellent releasability to the adhesive layer of the sanitary pad and almost no odor. It can be used extremely hygienically.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a sanitary pad with a release sheet of the sanitary pad of the present invention attached thereto.

FIG. 2 is a longitudinal sectional view of the sanitary pad of FIG.

FIG. 3 is a longitudinal sectional view showing a release sheet of the sanitary pad.

FIG. 4 is a perspective view showing a state in which the sanitary pad of FIG. 1 is folded.

FIG. 5 is a longitudinal sectional view of another sanitary pad in a state where a release sheet of the sanitary pad of the present invention is stuck.

[Description of Signs] 1 Release sheet for sanitary pad 11 Water-disintegrable base material 12 Water-soluble resin layer 13 Release agent layer A Sanitary pad

Claims (2)

[Claims] 1. A release sheet for a sanitary pad which is releasably laminated on a sanitary pad via an adhesive layer, wherein the release sheet comprises a water-soluble resin layer and a release agent layer on a water-decomposable base material. Are laminated and integrated with the water-soluble resin layer inside, and a release sheet for a sanitary pad. 2. The release agent layer comprises a silicone obtained by curing a dimethylsiloxane / methylvinylsiloxane copolymer and polymethylhydrogensiloxane by reacting them in the presence of a platinum catalyst. The release sheet for a sanitary pad according to claim 1.