JP2001145650A - Tacky adhesive sheet for body warmer, its housing bag and throw-away body warmer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a tacky adhesive sheet for body warmers which allows dealing with differences in material, knitting, or the like, with one kind of the body warmers, exhibits good adhesive force even in readhesion by resticking, does not therefore require the assortment of a wide variety and diversified kinds of the body warmers corresponding to the differences in material, knitting, or the like, and allows the formation of the throw-away body warmers not requiring the selective use by each of the body warmers. SOLUTION: This tacky adhesive sheet for body warmers is a tacky adhesive sheet used for formation of the throw-away body warmers and is formed by having >=2 layers of tacky adhesive layers (21, 22 and 23) laminated in a thickness direction on one surface of a sheet base material (1) and separating these tacky adhesive layer via separators (31 and 32). A housing bag is formed by adhering the tacky adhesive sheet for body warmers temporally covered with the tacky adhesive layers by the separators and the air permeable base material to a bag form. This throw-away body warmer is formed by housing an air permeable exothermic composition within such housing bag. Accordingly, many stages of the tacky adhesive layers may be made to share their roles by the selective use of the respective tacky adhesive layers and the selection of the tacky adhesive surfaces by a block calender system via the separators is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive sheet for a warmer having a variety of adhesives for forming a disposable warmer which can be adhered to clothes such as underwear and a bag for storing the same.

[0002]

2. Description of the Related Art A disposable body warmer in which a desired portion is heated by using a pressure-sensitive adhesive sheet in a bag for containing a ventilation heat-generating composition and adhering to underwear or the like via the pressure-sensitive adhesive layer has been widely used. Conventionally, a disposable body warmer provided with one adhesive layer has been known. However, when re-applying to change the warming point, the fibers are transferred to the adhesive layer and the adhesive strength is reduced and it is difficult to re-adhere, or the material or knitting such as cotton, nylon, plain weave or twill weave If they are different, the adhesive strength may be different and the desired attachment may not be achieved.It is inconvenient and impractical to use a warmer provided with an adhesive layer corresponding to the difference in material and knitting. There was a drawback that alignment was required.

[0003]

The present invention can cope with the difference in material and knitting with a single type of warmer, and shows good adhesive strength when re-adhering by re-attaching. It is an object of the present invention to develop a pressure-sensitive adhesive sheet for a warmer that can form a disposable warmer that does not require a wide variety of warmers to cope with the difference, and thus does not need to be used separately for each warmer.

[0004]

The present invention relates to a pressure-sensitive adhesive sheet used for forming a disposable body warmer, comprising two or more pressure-sensitive adhesive layers laminated on one side of a sheet substrate in the thickness direction, each of which is a separator. A pressure-sensitive adhesive sheet characterized by being separated through a, and that the pressure-sensitive adhesive sheet temporarily covered by a separator and the pressure-sensitive adhesive layer and the air-permeable base material are subjected to a bonding process in a bag shape. A disposable body warmer characterized by comprising a storage bag characterized by containing a ventilation heat-generating composition inside the storage bag.

[0005]

According to the present invention, the adhesive layers stacked in multiple stages share the role, and by using the adhesive surface properly, it is possible to exhibit the adhesive force corresponding to the difference in the material, knitting, etc. Also in the case of re-adhesion, it is possible to exert good adhesive strength through the new adhesive surface by exposing the new adhesive layer by peeling and removing the previous adhesive layer, and in that case through the separator The adhesive surface can be efficiently selected by an easy peeling operation using a day-turning method.

[0006] As a result of the above, a single type of warmer can cope with the difference in material and knitting, can cope with re-sticking, and can be adhered to clothes and the like from the start of use to the end of heat generation. Thus, it is possible to obtain a disposable body warmer that is unlikely to cause peeling and falling, and thus it is possible to avoid the necessity of a wide variety of warmers and the necessity of properly using each warmer.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The pressure-sensitive adhesive sheet for a warmer according to the present invention has two or more pressure-sensitive adhesive layers laminated on one side of a sheet substrate in the thickness direction, and the respective pressure-sensitive adhesive layers are separated via a separator, It is used to form a disposable body warmer. An example is shown in FIG. 1 is a sheet substrate, 21, 22, 2
3 is an adhesive layer, 31, 32, and 33 are separators.

[0008] As a sheet substrate, a polymer film,
An appropriate material such as a laminate such as a nonwoven fabric or a woven fabric can be used. The sheet substrate may have air permeability,
It is not necessary to have. As a sheet base that can be preferably used, for example, a sheet whose adhesive surface with a breathable base for forming a storage bag is made of a film having good heat sealability, and whose back surface is made of an adhesive layer and a film with good adhesion, etc. It is.

As a specific example of the above-mentioned sheet substrate that can be preferably used, as shown in FIG. 1, a heat seal layer 11 and a base layer 12 made of a polymer film or nonwoven fabric are laminated so as to form at least the front and back surfaces. And so on. The formation of a composite sheet by such a lamination method and the like, in addition to achieving the heat sealing property on the front and back surfaces and the adhesion with the adhesive layer, to impart desired performance such as heat resistance and mechanical strength of the entire sheet. Is also advantageous.

The material for forming the heat seal layer and the base layer is not particularly limited, and any suitable material can be used. Incidentally, as a material for forming the heat seal layer, for example, ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate copolymer, ethylene / methacrylate copolymer or low-density or ultra-low-density polyethylene, One type or a mixture of two or more types of high density polyethylene is exemplified. Those which can be particularly preferably used in terms of heat sealing properties, slip properties (smoothness of work), blocking properties, strength, etc. are metallocene polyethylenes obtained by polymerization using a metallocene catalyst, and especially linear low density Material or other low density material.

[0011] The purpose of the heat seal layer is to heat seal with a gas permeable base material such as a porous film through the layer. Therefore, as shown in the example of FIG.
1 is typically located on the outer surface of the sheet substrate. The thickness of the heat seal layer can be appropriately determined according to the adhesive strength and the like, but is generally 5 to 100 μm, preferably 10 to 80 μm, particularly 15 to 60 μm.

On the other hand, as a material for forming the base layer, for example, linear or other low-density polyethylene, medium-density polyethylene, high-density polyethylene, ultra-high-molecular-weight polyethylene, polyolefin such as polypropylene, ethylene-propylene copolymer, Olefin-based copolymers such as ethylene-propylene-diene copolymer, olefin- (meth) acrylate copolymers such as olefin-ethyl acrylate copolymer, and olefins such as olefin-methacrylic acid copolymer- (meth) acrylic An olefin-vinyl copolymer comprising an olefin such as ethylene or propylene and one or more other suitable vinyl monomers, such as an acid copolymer or an olefin-vinyl acetate copolymer; Olefins such as mixtures of more than one species Polymer can be preferably used. For example, a polymer other than a polyolefin such as polyester or a polymer other than an olefin / vinyl copolymer may be used.

An olefin-based polymer which can be preferably used from the viewpoint of preventing thermal deformation such as wrinkling in a preheating process during heat sealing or wrinkling due to elongation and curling due to shrinkage is a DSC (differential scanning calorimeter). Melting point of 13
It is at least 5 ° C, especially at least 140 ° C. The thickness of the base layer can be appropriately determined according to the strength and the like, but is generally 5 to 200 μm, preferably 10 to 100 μm, particularly 15 to 8 μm.
0 μm.

[0014] The sheet substrate may have one or more additional layers between the heat seal layer and the base layer. The additional layer may have an appropriate purpose such as reinforcement or improvement of heat resistance, and examples of the material for forming the additional layer include those exemplified for the base layer described above. The thickness of the additional layer can be appropriately determined according to the purpose of addition and the like, but is generally 5 to 200 μm, preferably 10 to 100 μm, particularly 15 to 80 μm.

The above-mentioned heat-sealing layer, base layer and optional additional layer forming the sheet base material can be formed into a suitable close-contact superposition system such as a casting system, a melt-forming system, a calender rolling system or a multi-coating system. Can be formed. From the viewpoint of production efficiency and the like, an extrusion molding method via a T die, an inflation die, or the like is preferable.
From the viewpoint of suppressing internal strain, an extrusion molding method via a T-die is particularly preferable.

The preferred thickness of the sheet substrate is 300 μm
Hereinafter, it is particularly 150 μm or less, particularly 10 to 100 μm. In this case, the thickness of the base layer is 30 to 95% of the total thickness of the sheet substrate, particularly 40 to 85%, in view of the strength of the substrate.
%, Particularly preferably 50 to 80%.

The sheet substrate, particularly its base layer and optional additional layer, may be irradiated with radiation such as electron beams or ultraviolet rays, if necessary, by blending a crosslinking agent with the forming material and heating or / and / or heating. The cross-linking treatment can be performed by an appropriate method such as a method of cross-linking treatment by irradiation with radiation. Crosslinking is effective in improving the strength and heat resistance of the sheet substrate. Further, for example, the above-mentioned layer is an inorganic filler or a pigment or an antioxidant,
Appropriate additives such as an antistatic agent, a flame retardant, a lubricant, a softener, and an antibacterial agent can be blended as required. In particular, since the ventilating heat-generating composition for forming a warmer is a colored substance such as black, it is desirable that the sheet base material having internal concealment be formed by an appropriate method such as mixing of a coloring agent.

The adhesive layer provided on one side of the sheet substrate, usually on its base layer, is used to adhere and hold the body warmer to clothing such as underwear. In the present invention, each adhesive layer is provided as shown in FIG. Layers 21, 22, and 23 are separated by separators 31, 3
It is formed as a multi-stage adhesive layer formed by laminating two or more layers in the thickness direction in a state where they are separated from each other through the two layers. This makes it possible to easily select an adhesive surface in a day-turning type via the separator, and to selectively use an adhesive layer sharing a role according to a difference in a material, knitting, or the like, and perform re-attachment via a new adhesive layer. .

The combination of the multi-layered adhesive layers is not particularly limited. For example, a combination of the same type of adhesive layers for re-attachment and a different type of adhesive layer for the purpose of coping with the difference of the material forming the adherend. Combinations of different types of fabrics, and combinations of adhesive layers with different thicknesses for the purpose of responding to differences in knitting of fabrics. And a combination of three or more pressure-sensitive adhesive layers.

Incidentally, in the above, as a countermeasure based on the difference in the material, for example, the adhesive property is different between a high-polarity fiber such as nylon or polyester and a low-polarity fiber such as cotton, and the same pressure-sensitive adhesive layer has the same adhesive property for both types of fibers. Since it is difficult to provide a satisfactory adhesive holding power, it is desired to use a combination of pressure-sensitive adhesive layers having different compositions according to the properties of the materials. Therefore, in general, it is preferable to have a multi-stage structure including a highly-polarized adherend and a highly adhesive pressure-sensitive adhesive layer. Also in the case of cloths of the same kind, the adhesive strength of the same adhesive layer differs due to the difference in knitting such as plain weave and twill weave. It is desired to do.

For forming the pressure-sensitive adhesive layer, one or two of appropriate pressure-sensitive adhesives such as acrylic, rubber, silicone, polyvinyl ether, hot melt, etc., depending on the intended combination of the pressure-sensitive adhesive layers, etc. The above can be used, and there is no particular limitation. A hot-melt pressure-sensitive adhesive can be preferably used from the viewpoint of environmental friendliness such as solvent-free coating properties and safety. There is no particular limitation on the hot melt adhesive,
Generally, a styrene-based polymer obtained by using one or more appropriate styrene-based block polymers can be preferably used.

Incidentally, examples of the styrene-based block polymer include styrene-ethylene-butylene copolymer-styrene, styrene-ethylene-propylene copolymer-styrene, styrene-butadiene-styrene and styrene-isoprene-styrene. -BA type block polymer or hydrogenated product thereof, styrene-ethylene / butylene copolymer or styrene-ethylene / propylene copolymer, AB type block polymer such as styrene-butadiene or styrene-isoprene or its water And the like.

In preparing the pressure-sensitive adhesive, for example, α-pinene, β-pinene polymer, diterpene polymer, α-pinene phenol, Terpene resins such as copolymers, hydrocarbon resins such as aliphatic and aromatic, aliphatic and aromatic copolymers, rosin resins, coumarone indene resins, and (alkyl) phenol resins And a suitable tackifier such as xylene-based resin or the like. Further, for example, appropriate additives such as a softening agent such as a liquid polymer and a paraffin-based oil, a filler, a pigment, an antioxidant, and a stabilizer can be blended as necessary.

The adhesive strength of the pressure-sensitive adhesive layer can be appropriately determined according to the size of the disposable body warmer, the adherend, and the like. Since it is not preferable to exhibit an adhesive strength enough to break clothes and the like when peeling off the adhesively fixed body warmer, it is generally 10 to 2000 gf / 20 mm, based on the adhesive strength to a stainless steel plate (180 degree peel). Medium 50-1500
gf / 20 mm, especially 100-1200 gf / 20 mm is preferably used. In addition, each of the adhesive layers forming the multi-stage adhesive layer can be easily used depending on the adherend by an appropriate method such as a color classification method using a coloring agent.

The pressure-sensitive adhesive layer can be provided on the entire surface or on one side of the sheet substrate. The formation is performed by an appropriate method such as a method of directly applying an adhesive liquid on a sheet base material or a method of transferring an adhesive layer applied and formed on a separator to the sheet base material according to the method. A hot-melt coating method such as a pressure-sensitive adhesive extrusion method can be used for the coating. The multi-layered pressure-sensitive adhesive layer can be formed by an appropriate method similar to the above, for example, by a multi-coating method using a separator or a method of laminating the pressure-sensitive adhesive layer formed on the separator together with the separator.

The pressure-sensitive adhesive layer, which is preferable from the viewpoint of the ease of the separator peeling operation, is preferably the pressure-sensitive adhesive layer 2 as illustrated in FIG.
The discontinuous portions 41, 42, 43 are provided between 1, 22, 23, and the separator portions corresponding to the discontinuous portions are provided with cuts 51, 52, 53 by spine splitting or perforations. More preferred. The width of the discontinuous portion is
Although it can be determined as appropriate, it is generally 60 mm or less, preferably 5 to 4 mm.
0 mm, especially 10 to 20 mm.

The formation of the pressure-sensitive adhesive layer having the discontinuous portion is as follows.
In the method of forming the adhesive layer described above, a method of intermittently applying or discharging the adhesive or a method of applying or discharging the adhesive at another predetermined interval from the substrate or the like, on a substrate provided with a pattern mask It can be performed by an appropriate method such as a method of applying or discharging the liquid.

The pressure-sensitive adhesive layer may be formed by applying a pattern in an appropriate state such as a stripe, a dot, or a grid. In this case, the pressure-sensitive adhesive layer forming the same surface is made of a pressure-sensitive adhesive of a different composition. A part and a part having a different adhesive strength may be mixed. By the way, with one kind of styrene-based hot-melt type adhesive, the adhesive force may differ greatly due to the temperature change from the start of use of the heating device to the end of heat generation, and it may not be possible to achieve the purpose of maintaining the adhesive. 2 different
Even if the pressure-sensitive adhesive layer obtained by mixing one or more styrene-based hot-melt type pressure-sensitive adhesives cannot sufficiently cope with the temperature change, the temperature characteristics of the above-mentioned adhesive force differ in such a case. It is preferable to form an adhesive layer obtained by pattern-coating two or three or more styrene-based hot-melt adhesives.

The thickness of the pressure-sensitive adhesive layer may be appropriately determined according to the adhesive force or the like, but may be determined as appropriate, but is generally 1 to 50.
0 μm or less, especially 5 to 200 μm, especially 10 to 100 μm
It is said. In addition, for the sheet substrate surface or the separator surface to which the adhesive layer is attached, an appropriate surface treatment such as a corona treatment, a plasma treatment, or an undercoating treatment may be performed as necessary for the purpose of improving the adhesion to the adhesive layer. Can be applied. Such an improvement in the adhesion between the sheet substrate and the separator and the pressure-sensitive adhesive layer is more preferable because, for example, the warmer is peeled off from the clothes and the like without leaving any adhesive.

In the case of a styrene-based hot-melt pressure-sensitive adhesive layer, the adhesion to the pressure-sensitive adhesive layer can be improved even when a styrene-based elastomer is contained in a sheet substrate, particularly, its base layer or separator. As the styrene-based elastomer, an appropriate one containing styrene as a component can be used, and particularly, a copolymer containing styrene and a component forming a base material of the sheet substrate, particularly a base layer thereof, adheres tightly to an adhesive layer. It can be preferably used from the viewpoint of force and the like. Incidentally, examples thereof include the styrene-based block polymers described above.

As shown in the drawing, the adhesive layers 21 and 22, 22 and 23
The separators 31 and 32 disposed between them are for the purpose of supporting and fixing the adhesive layer on the upper surface and easily peeling off the adhesive layer on the lower surface. Accordingly, as a separator, one surface of an appropriate thin leaf such as a plastic film or a laminate thereof with paper is subjected to a surface treatment with an appropriate release agent such as a silicone-based, long-chain alkyl acrylate-based, or fluorine-based material, if necessary. Is preferably used. The thickness of the separator is usually about 10 to 200 μm, especially about 20 to 100 μm.
If necessary, the separator may be subjected to printing or the like such as a method of properly using the multi-stage adhesive layer.

As shown in FIG. 1, if necessary, the adhesive surface of the outermost adhesive layer 23 of the multi-layer adhesive layer is contaminated until the disposable body warmer is used for bonding to clothing or the like. The separator 33 is temporarily adhered and coated as necessary for the purpose of preventing the adhesive strength from being lowered.

The disposable body warmer according to the present invention has a multi-stage adhesive layer, the outermost surface of which is temporarily covered with a separator, and a pressure-sensitive adhesive sheet for a body warmer and a gas-permeable base material, which are bonded into a bag-like shape. It can be formed by containing an exothermic composition. There is no particular limitation on the formation thereof except that the pressure-sensitive adhesive sheet according to the present invention is used, and a disposable body warmer can be formed by using such a pressure-sensitive adhesive sheet by an appropriate method according to the related art.

Incidentally, as an example of the above-mentioned method, first, a long pressure-sensitive adhesive sheet for a warmer according to the present invention having a continuous heating unit and a long air-permeable base material corresponding thereto are continuously supplied from its winding roll or the like. While being introduced between a pair of pressure-bonding rolls, the heat-sealing of the sheet substrate surface of the pressure-sensitive adhesive sheet and a predetermined portion of the gas-permeable substrate under rotation of the pressure-bonding roll, A predetermined amount of the ventilating heat-generating composition is supplied into the void, and the portion corresponding to the left and right sides and the upper and lower sides of the storage bag to be formed in a state where the composition is stored is sealed and sealed. And a method of sequentially forming an accommodating bag in which the ventilating heat-generating composition is sealed, and cutting the bag by a suitable method such as a punching method in units of a warmer.

In the above, the air-permeable base material may be, for example, a porous film made porous by an appropriate method such as a stretching treatment or a perforation treatment, a gas-permeable sheet such as a nonwoven fabric or a woven fabric, or a combination of the porous film and the gas-permeable sheet. Can be used according to the related art, such as those obtained by laminating through a suitable air-permeable adhesive layer such as a non-woven porous adhesive layer.

[0036] The ventilation heat-generating composition contained in the storage bag is also based on the air permeability of the storage bag made of, for example, metal powder such as iron, water, a water retention agent such as salts or activated carbon, and an oxidation promoter. Appropriate materials such as those that generate heat upon contact with the taken-in oxygen (air) can be used, and any of the ventilating heat-generating compositions in conventional disposable warmers can be used. The amount of the ventilation heat-generating composition to be filled is appropriately determined depending on the maximum heat generation temperature, the time for which the temperature is to be maintained, and the like.

The disposable body warmer thus formed is sealed in an outer bag and shut off from the outside air until it is put to practical use, and measures are taken to prevent the exothermic reaction from proceeding. The disposable body warmer can also contain a magnetic substance such as a magnet for the purpose of improving blood circulation and stiff shoulders by a magnetic effect.

[0038]

EXAMPLE 1 A two-layer extrusion method using a T-die having a 15 μm thick heat-sealing layer made of linear low-density polyethylene and a 50 μm thick base layer made of polypropylene.
A laminate film having a layer structure is obtained, and three kinds of adhesive sheets each having a rubber-based adhesive layer having a thickness of 30 μm formed on a separator on the outer surface of the base layer are adhered and laminated together with the separator to form a laminate having a length of 120 mm and a width of 100 mm. A pressure-sensitive adhesive sheet was obtained. The three pressure-sensitive adhesive layers had a configuration in which the adhesive force gradually became smaller than that of the base layer. Next, the pressure-sensitive adhesive sheet for a warmer and the nonwoven fabric laminated with a porous film were arranged to face each other, an air-flow-generating composition of iron powder was arranged between them, and the periphery thereof was heat-sealed to form a disposable warmer.

Example 2 A pressure-sensitive adhesive sheet for a warmer was obtained in the same manner as in Example 1 except that the three pressure-sensitive adhesive layers were configured such that the adhesive force gradually increased from the base layer side, and a disposable warmer was formed.

Example 3 An adhesive sheet for a warmer was obtained in the same manner as in Example 1 except that the adhesive layer on the base layer side of the adhesive layer having a three-layer structure was replaced with one having good adhesion to a highly polar adherend. Was formed.

Example 4 An adhesive sheet for a warmer was obtained in the same manner as in Example 1 except that the intermediate adhesive layer in the adhesive layer having a three-layer structure was replaced with one having good adhesion to a highly polar adherend, thereby forming a disposable warmer. did.

Example 5 The uppermost adhesive layer in the three-layered adhesive layer was omitted, and
A pressure-sensitive adhesive sheet for a warmer was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive layer had a layer structure, and a disposable warmer was formed.

Comparative Example 1 A pressure-sensitive adhesive sheet for a warmer was obtained in the same manner as in Example 1 except that the uppermost layer and the intermediate layer of the three-layer adhesive layer were omitted to provide a single-layer adhesive layer. Was formed.

Comparative Example 2 A pressure-sensitive adhesive sheet for a warmer was obtained according to Example 1, except that the uppermost and lowermost pressure-sensitive adhesive layers in the three-layer pressure-sensitive adhesive layer were omitted to obtain a single-layer pressure-sensitive adhesive layer. Was formed.

Comparative Example 3 A pressure-sensitive adhesive sheet was obtained according to Example 1, except that the intermediate layer and the lowermost pressure-sensitive adhesive layer in the three-layered pressure-sensitive adhesive layer were omitted to obtain a single-layered pressure-sensitive adhesive layer. Was formed.

Comparative Example 4 A pressure-sensitive adhesive sheet for a warmer was obtained in the same manner as in Example 3, except that the uppermost layer and the intermediate layer in the three-layer adhesive layer were omitted to obtain a single-layer adhesive layer. Was formed.

Evaluation Test The disposable warmers obtained in Examples and Comparative Examples were put to practical use by the following methods and evaluated. Example 1 After removing the separator on the outermost surface and adhering it to the cotton-based undergarment via the exposed adhesive layer and holding it for 1 hour, the detachment and reattachment were attempted. However, the adhesive layer was peeled off every time of movement due to insufficient adhesive force. Therefore, the next separator was peeled off together with the uppermost adhesive layer to expose an intermediate adhesive layer, and was re-attached via the adhesive surface. As a result, a satisfactory adhesion holding state could be formed, and no dropping occurred.

Example 2 The outermost separator was removed and the wool underwear was adhered and held through an exposed adhesive layer. After removal of heat, the high adhesion type was extremely depilated and the underwear was greatly damaged. Using a warmer, the intermediate separator was peeled off together with the uppermost adhesive layer to expose the intermediate adhesive layer, adhered to the wool underwear through the adhesive surface in the same manner as described above, and removed after the end of heat generation. Caused almost no damage.

Example 3 The intermediate separator was peeled off together with the uppermost adhesive layer to expose the intermediate adhesive layer and adhered to the nylon underwear via the adhesive surface. When the adhesive was insufficient, the intermediate separator peeled off every time it moved. Therefore, the remaining separator was peeled off together with the intermediate adhesive layer to expose the lowermost adhesive layer and adhered via the adhesive surface. As a result, a satisfactory adhesion holding state could be formed, and no dropping occurred.

Example 4 The outermost surface of the separator was peeled off to expose the uppermost pressure-sensitive adhesive layer and adhered to polyester underwear through the pressure-sensitive adhesive surface. Was peeled off together with the uppermost adhesive layer to expose an intermediate adhesive layer, and adhered to polyester underwear via the adhesive surface. As a result, a satisfactory adhesion holding state could be formed, and no dropping occurred.

Example 5 After removing the upper separator and adhering it to the cotton-based undergarment via the exposed adhesive layer and keeping it for 1 hour, the detachment was attempted and the adhering was attempted. However, it will peel off every time it moves due to insufficient adhesion,
The lower separator was peeled and removed together with the upper adhesive layer to expose the lower adhesive layer, and was re-attached via the adhesive surface. As a result, a satisfactory adhesion holding state could be formed, and no dropping occurred.

Comparative Example 1 The separator was removed and the wool underwear was adhered and held via the exposed adhesive layer. After removal of heat, the wool undergarment was removed. Due to the high adhesive strength, the hair was severely damaged and the underwear was greatly damaged, which was not suitable for practical use. Was.

Comparative Examples 2 and 3 After the separator was removed and adhered to the cotton undergarment via the exposed adhesive layer and held for 1 hour, removal and reattachment were attempted. However, in Comparative Example 2, the adhesive peeled off every time due to insufficient adhesive strength,
In Comparative Example 3, the adhesive strength was lower than that in Comparative Example 2, and it was difficult to re-attach.

Comparative Example 4 The separator was removed and the undergarment was adhered and held through the exposed adhesive layer, and was removed after the end of the heat generation. When the fabric was made of nylon or polyester, it did not fall off and there was almost no damage. The fabric was very damaged when detached due to very high adhesion.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of a pressure-sensitive adhesive sheet for a warmer.

[Explanation of symbols]

 1: sheet base material 11: heat seal layer 12: base layer 21, 22, 23: adhesive layer 31, 32, 33: separator

Continued on the front page F term (reference) 4C099 AA01 CA19 GA03 HA03 JA04 LA08 NA05 4J004 AA05 AA08 AA10 AA11 AB01 AB03 CA04 CB01 CC02 CC03 CE01 DB02 EA04 FA08

Claims (5)

[Claims] 1. A pressure-sensitive adhesive sheet used for forming a disposable body warmer, comprising two or more pressure-sensitive adhesive layers laminated on one side of a sheet substrate in a thickness direction, wherein each pressure-sensitive adhesive layer is separated via a separator. An adhesive sheet for a warmer, characterized in that: 2. The pressure-sensitive adhesive sheet for a warmer according to claim 1, wherein the two or more pressure-sensitive adhesive layers are a combination of layers of different pressure-sensitive adhesives or layers having different adhesive strengths. 3. The pressure-sensitive adhesive sheet according to claim 1, wherein the high-polarity adherend includes a good-adhesion pressure-sensitive adhesive layer. 4. The pressure-sensitive adhesive sheet for warming according to claim 1, wherein the outermost surface of the pressure-sensitive adhesive layer is temporarily covered with a separator, and the air-permeable base material is adhered in a bag shape. Storage bag. 5. A disposable body warmer wherein the ventilation heat-generating composition is housed inside the housing bag according to claim 4.