JPH0912983A - Heat-sensitive tacky sheet - Google Patents

Abstract

PURPOSE: To obtain a tacky sheet, excellent in antimicrobial persistence and useful for a label, etc., of a soft drink, etc., by forming a heat-sensitive tacky agent layer consisting essentially of a thermoplastic resin and a solid plasticizer on a substrate having antimicrobial activities. CONSTITUTION: This heat-sensitive tacky sheet is obtained by forming a heat- sensitive tacky agent layer containing a microcapsule, consisting essentially of a thermoplastic resin such as a styrene-isoprene copolymer and a solid plasticizer such as dihexyl phthalate and enclosing a phytontid component therein on a substrate containing one or more selected from zirconium phosphate supporting silver, silver carboxymethyl cellulose, a quaternary ammonium salt of carboxymethyl cellulose and the phytontid.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a heat-sensitive adhesive sheet, and more particularly to an antibacterial heat-sensitive adhesive sheet.

[0002]

2. Description of the Related Art Conventionally, labels such as soft drinks, alcoholic beverages, and glass bottles such as chemical bottles have been coated with a water-soluble adhesive such as casein or starch on the back side of a substrate by an automatic labeler or the like. A method of sticking or a method of sticking a label of a general pressure-sensitive adhesive sheet having a structure in which a surface base material, a pressure-sensitive adhesive layer, and a release sheet are sequentially laminated using an automatic labeler or the like is adopted. However, a label provided with a water-soluble adhesive, when the water-soluble adhesive is applied to the back of the base material, the label curls, and after sticking to a glass bottle, the label is wrinkled or floated, the label becomes defective and the appearance is impaired. There was a problem.
On the other hand, a label of a pressure-sensitive adhesive sheet having a general structure is usually used after peeling off the release sheet, but the peeled release sheet is difficult to reuse even if collected, and is almost always discarded. In recent years, attention has been paid to resource saving and environmental problems, and a heat-sensitive adhesive sheet that does not require a release sheet has been receiving attention.

Generally, a heat-sensitive adhesive sheet has a structure in which a heat-sensitive adhesive is applied to one side of a base material, and is usually used as a label by printing the other surface of the base material. The heat-sensitive adhesive is mainly composed of a thermoplastic resin and a solid plasticizer, and is non-adhesive at room temperature, but it is activated and develops adhesiveness when heated by a labeler or oven equipped with a heating device. . Usually the activation temperature is 50-150 ° C,
In this temperature range, the solid plasticizer in the heat-sensitive adhesive begins to melt and gives the thermoplastic resin adhesiveness. Since the molten solid plasticizer slowly crystallizes after being supercooled, the tackiness is maintained for a long time, so that it is used by sticking to a glass bottle or the like while having the tackiness.

[0004] Even if the heat-sensitive adhesive sheet is continuously adhered to a glass bottle by a labeler or the like provided with a heating device, a water-soluble adhesive is applied to the back surface of the label and the method is applied to the glass bottle. There is no problem of poor labeling. In addition, there is an advantage that the release sheet is not used unlike the general pressure-sensitive adhesive sheet described above, and thus it can be produced at a low cost.
It is also advantageous from the viewpoint of resource saving and environmental problems. Further, from the viewpoint of use as a label for soft drinks, alcoholic beverages, glass bottles such as chemical bottles, it is very advantageous that the label itself has antibacterial properties.

[0005]

The present invention relates to a heat-sensitive adhesive sheet having a novel antibacterial property, for example, when it is used as an antibacterial label for an article to be packaged such as foods and pharmaceuticals, or as an antibacterial wallpaper for building interiors. An object of the present invention is to provide a heat-sensitive adhesive sheet having a high antibacterial effect and an excellent antibacterial property in which the antibacterial effect does not disappear even after long-term use.

[0006]

A heat-sensitive adhesive sheet comprising a base material and a heat-sensitive adhesive layer comprising a thermoplastic resin and a solid plasticizer as a main component, wherein the base material and / or the heat-sensitive adhesive agent A layer is a heat-sensitive adhesive sheet having an antibacterial property. A heat-sensitive adhesive sheet whose base material is a sheet containing at least one selected from zirconium phosphate carrying silver, carboxymethylcellulose silver salt, carboxymethylcellulose quaternary ammonium salt, and phytoncide. The heat-sensitive adhesive layer is a heat-sensitive adhesive sheet in which phytoncide is contained in a heat-sensitive adhesive containing a thermoplastic resin and a solid plasticizer as a main component. The heat-sensitive pressure-sensitive adhesive layer is a heat-sensitive pressure-sensitive adhesive sheet in which microcapsules containing a phytoncide component are contained in a heat-sensitive adhesive having a thermoplastic resin or a solid plasticizer as a main component.

[0007]

The heat-sensitive adhesive sheet having antibacterial properties of the present invention is
A heat-sensitive adhesive layer containing a thermoplastic resin and a solid plasticizer as a main component is provided on a base material, and antibacterial properties are imparted to at least one of the base material and the heat-sensitive adhesive layer. Especially,
It is preferable that both have antibacterial properties.

The method for imparting antibacterial properties to the substrate of the present invention is selected from, for example, zirconium phosphate having silver supported on the surface substrate, carboxymethylcellulose silver salt, carboxymethylcellulose quaternary ammonium salt, and phytoncide. One containing at least one of The material is not particularly limited as long as it is a sheet-shaped substrate, such as one containing the material in the substrate or one coated on the surface of the substrate. For example, the average particle size is 0.1.
Thermoplastic resin in which zirconium phosphate having a range of ˜1.0 μm and silver supported thereon is kneaded so that the content ratio of the antibacterial agent to the thermoplastic resin is in the range of 0.1 to 3.0% by weight. A long-fiber non-woven sheet made of carboxymethylcellulose, which adsorbs silver by utilizing the ion-exchange ability of carboxymethylcellulose, and a paper sheet produced by mixing the carboxymethylcellulose silver salt with cellulose pulp by a known paper machine, and the paper sheet and a hydrophobic sheet. Composite non-woven sheet in which spunbonded non-woven fabrics made of continuous continuous fibers are laminated and integrated, fiber sheet containing at least one of carboxymethylcellulose quaternary ammonium salt or carboxymethylcellulose chlorhexidine salt, and microcapsules containing phytoncide And the like. In addition, as the surface base material that does not exhibit antibacterial properties,
Known substrates such as papers, synthetic papers, films, non-woven fabrics, woven fabrics and metal foils can be used.

On the other hand, as a method of imparting antibacterial properties to the heat-sensitive adhesive layer, a method in which a phytoncide component is added to the heat-sensitive adhesive is excellent in antibacterial property, and therefore, preferable.

The heat-sensitive adhesive is not particularly limited as long as it contains a thermoplastic resin or a solid plasticizer as a main component, and known ones can be used. As a thermoplastic resin,
Styrene-isoprene copolymer, vinyl acetate-ethylene-styrene copolymer, vinyl acetate-ethylene copolymer,
Vinyl acetate-ethylene-vinyl chloride copolymer, vinyl acetate-ethylene-acrylic acid ester copolymer, vinyl acetate-acrylic acid ester copolymer, ethylene-vinyl chloride copolymer, (meth) acrylic acid ester copolymer , Styrene- (meth) acrylic acid ester copolymer, acrylonitrile-butadiene copolymer, styrene-butadiene copolymer and the like.

The glass transition temperature of the thermoplastic resin is in the range of -10 to 60 ° C. By the way, if the glass transition temperature of the thermoplastic resin is less than -10 ° C, there is a problem that it has tackiness even at room temperature, and conversely, if it exceeds 60 ° C, there is a problem that tackiness is difficult to appear.

Examples of solid plasticizers used for heat-sensitive adhesives include dihexyl phthalate (melting point 65 ° C.), dicyclohexyl phthalate (melting point 63 to 65 ° C.), dihydroabietyl phthalate (melting point 65 ° C.), isophthalic acid. Dimethyl (melting point 66-67 ° C), sucrose benzoate (melting point 98
℃), ethylene glycol dibenzoate (melting point 70 ℃),
Trimethylolethane tribenzoate (melting point 73 ° C), pentaerythritol tetrabenzoate (melting point 95 ° C), sucrose octaacetate (melting point 89 ° C), tricyclohexyl citrate (melting point 57 ° C), N-cyclohexyl-p-toluene. Examples thereof include sulfonamide (melting point 86 ° C.).

The average particle size of the solid plasticizer is preferably 4 μm or less. Incidentally, if the average particle size exceeds 4 μm, heat transfer during heat activation is slow and the adhesive function may be deteriorated. As a method for pulverizing the solid plasticizer to a desired average particle diameter, it is preferable to use a pulverizer such as a ball mill or a sand mill.

The phytoncide used in the present invention is
Natural tree essential oils and vinegar oils obtained by steam distillation, pressing, or various extraction methods from natural trees, branches, leaves, rhizomes, bark, fruits, etc., for example, extracted from the leaves of tea trees, oysters, mountain tea flowers, etc. Examples include wood essential oil, hinoki, cedar, pine, hiba, and wood essential oil extracted from eucalyptus trees.

The main components thereof include terpene substances such as α-pinene, β-pinene, ditenpen, ε-limonene, terpinolene, linalool, terpineol, borneol, cineol and hinokitiol, pinetrins, isothiocyanates and the like. To be

The amount of phytoncide added is 0.1 to 50 parts by weight, preferably 1 to 30 parts by weight, based on 100 parts by weight of the heat-sensitive adhesive resin. By the way, if the addition amount is less than 0.1 parts by weight, the antibacterial effect is small, and if it exceeds 50 parts by weight, the adhesive strength of the pressure-sensitive adhesive sheet becomes too low, which is not preferable.

It is more preferable that at least one kind of the above-mentioned phytoncide component is encapsulated in microcapsules and added to the heat-sensitive adhesive resin to produce a heat-sensitive adhesive, since the antibacterial property lasts. Such microcapsules can be prepared by various known methods and are not particularly limited, and examples thereof include a coacervation method using gelatin and the like, an in-situ method using a synthetic polymer system, and an interfacial polymerization method. . In the coacervation method, oil drops are emulsified with hydrophilic nitrogen-containing compounds such as gelatin, gum arabic, casein, and albumin in water, and coacervation is caused by pH adjustment and concentration adjustment, followed by cooling and curing to produce. .

The in-situ polymerization method includes a method of using an aldehyde resin such as urea-formalin resin, melamine-formalin resin, and melamine-urea-formalin resin as a capsule wall film. Generally, urea, thiourea,
At least one amine such as alkylurea, ethyleneurea, acetoguanamine, melamine, guanidine, buret, and cyanamide, and at least one kind of formalin, acetaldehyde, paraformaldehyde, hexamethylenetetramine, glutaraldehyde, glyoxal, furfural, etc. Capsules are produced using the aldehydes of 1 above, or an initial condensate obtained by condensing them.

In the interfacial polymerization method, a method of producing a polyurethane resin, a polyurea resin, a polyamide resin or the like at the extraction interface is exemplified, and generally, polyvalent isocyanate and water, polyvalent isocyanate and polyol, isothiocyanate and polyol. Synthetic capsules are manufactured by an interfacial polymerization method using polyvalent isocyanate and polyamine, isothiocyanate and polyamine, and the like.

Further, the phytoncide components contained in the microcapsules may be used alone or in combination, and may be contained together with the non-volatile oil. The size of the microcapsules containing the phytoncide component is usually in the range of 1 to 100 μm, preferably 1 to 20 μm. Such a microcapsule effectively releases the phytoncide component by controlling the film thickness of the capsule. By the way, if the film thickness is too thick, the diffusion of the phytoncide component is hindered, and if it is too thin, the diffusion is too strong, which causes a problem in the sustainability of the effect. About 30% is desirable.

As a method for producing the heat-sensitive adhesive sheet having antibacterial properties of the present invention, a heat-sensitive adhesive is brushed, sprayed, screen-printed, coating applicator, gravure-printed on a substrate according to a conventional method. Offset printing, letterpress printing, Mayer bar, kiss roll coater, lip coater, direct roll coater, offset roll coater, gravure roll coater, reverse roll coater, rod coater, blade coater, air knife coater, etc. It is dried to provide a heat-sensitive adhesive layer.

The drying can be carried out by a conventional method combined with the above-mentioned apparatus for coating, but at the time of drying, it must be carried out at a temperature lower than the melting point of the solid plasticizer. By the way, if the solid plasticizer is dried at a temperature higher than the melting point of the solid plasticizer, the solid plasticizer is melted during the drying and the heat-sensitive adhesive layer becomes tacky. For the above reasons, it is generally preferable that the drying temperature is 50 ° C. or lower.

The coating amount of the heat-sensitive adhesive is 5 to 5 in dry weight.
50g / m^TwoRange, preferably 10-30 g / m
^TwoIs adjusted by. By the way, the coating amount is 5g / m^TwoLess than
Is a sufficient adhesive force when sticking to a glass bottle etc. as a label
Was not obtained, while 50 g / m ^TwoBeyond the bonding machine
Noh is saturated and the economy is poor.

[0024]

The present invention will be described in more detail with reference to the following examples, but of course the present invention is not limited thereto. Unless otherwise specified, all parts, weights, ratios, coating amounts and the like in the examples are shown by solid content weight.

Example 1 (Production of Substrate Having Antibacterial Property) Acid-type carboxymethyl cellulose having a substitution degree of 0.42 (trade name: Kikkolate H)
C, manufactured by Nichirin Chemical Co., Ltd.), with a solid concentration of 2%
The silver nitrate aqueous solution was added to obtain a slurry concentration of 2.5%, and the mixture was sufficiently stirred, placed at a temperature of 25 ° C., and allowed to stand for 60 minutes. After that, the contents were deliquored and washed thoroughly with water, and then dehydrated to a pulp concentration of 30% with a centrifugal dehydrator to obtain a solid concentration of 30%.
% Carboxymethylcellulose silver salt was obtained. The silver content based on the total dry weight of the carboxymethyl cellulose silver salt was 1.84%. This carboxymethylcellulose silver salt is stirred for 1 minute with a household mixer to open the fibers, and then mixed with unbeaten coniferous bleached kraft pulp to give a carboxymethylcellulose silver salt content of 0.54% based on the total dry weight. The mixed pulp was prepared as described above, and a paper sheet having a basis weight of 95 g / m ² was prepared using a laboratory handmade machine. The silver content in the obtained sheet was 0.01% based on the total dry weight. Next, the fineness is 2.5 denier,
A spunbonded nonwoven fabric made of polypropylene resin having a basis weight of 12 g / m ² was prepared. 0.3m area for non-woven fabric
m ² and the total area was 7 area% of the spot fusion zone. A handmade paper sheet is laminated on a non-woven fabric which is continuously drawn from the winding, and this laminated body is placed on a rotary type endless wire mesh (30 mesh stainless wire), and then the hole diameter is 0.15 mm. The antibacterial composite non-woven sheet is moved by moving it at a speed of 10 m / min under a high-pressure water flow device having nozzle holes arranged at intervals of 1 mm to eject a water column flow at a water pressure of 90 kg / m ² for water confounding. Manufactured.

(Production of Heat-Sensitive Adhesive Sheet Having Antibacterial Property) A commercially available heat-sensitive adhesive (trade name: Cybinol X-38) is formed on one surface of the above substrate using a reverse roll coater.
6-846E, manufactured by Saiden Chemical Co., Ltd.) 20 g / m
^It was applied so that it would be ^2, and dried at 40 ° C. to obtain an antibacterial heat-sensitive adhesive sheet of the present invention.

Example 2 (Production of Thermosensitive Adhesive) Styrene as a thermoplastic resin
100 parts by weight of butadiene copolymer (trade name: P4626, manufactured by Sumitomo Dow Co., Ltd., glass transition temperature 9 ° C.), 200 parts by weight of dicyclohexyl phthalate having an average particle diameter of 1 μm as a solid plasticizer, 28 parts by weight of hinokitiol as phytoncide, Antiblocking agent, dispersant, antifoaming agent,
A thickener and the like were added and uniformly mixed to obtain a heat-sensitive adhesive coating liquid having a solid content concentration of 50%.

(Production of Heat-Sensitive Adhesive Sheet Having Antibacterial Property) The same heat-sensitive adhesive as that of Example 1 was coated with 2 parts of the above-mentioned heat-sensitive adhesive.
The heat-sensitive adhesive sheet having antibacterial properties of the present invention was obtained by coating and drying so as to give 5 g / m ² .

Example 3 (Preparation of phytoncide-encapsulating microcapsules) 4.5 parts of acid-treated gelatin is sufficiently dissolved in 115 parts of water. To this, 10 parts by weight of α-pinene, 10 parts by weight of β-pinene, and 10 parts by weight of eucalyptus oil were added and emulsified at 40 ° C. Next, 4
After adding 60 parts by weight of a 10% aqueous solution of gum arabic at 0 ° C and further adding 30 parts by weight of warm water at 40 ° C, pH was adjusted with acetic acid.
It was adjusted to 4.0 and cooled to 5 ° C. Further, 8.4 parts by weight of a 10% formalin aqueous solution was added, and then the pH was adjusted to 10 with sodium hydroxide and cured. The obtained microcapsule liquid was spray-dried to obtain microcapsules having an average particle size of 11 μm and a wall film content of 15%.

(Production of heat-sensitive adhesive) In the production of the heat-sensitive adhesive of Example 2, instead of adding 28 parts of hinokitiol, 25 parts by weight of microcapsules containing phytoncide were added and stirred, and a thickener was further added. , Antifoam,
A dispersant and the like were added to complete a heat-sensitive adhesive coating solution having a concentration of 55%.

(Production of Heat-Sensitive Adhesive Sheet Having Antibacterial Property) The same heat-sensitive adhesive as described in Example 1 was coated on one surface with 2 parts of the above-mentioned heat-sensitive adhesive.
The heat-sensitive adhesive sheet having antibacterial properties of the present invention was obtained by coating and drying so as to give 5 g / m ² .

Example 4 (Production of heat-sensitive adhesive) In the production of the heat-sensitive adhesive of Example 3, Example 3 was repeated except that the addition amount of the microcapsules containing phytoncide was 25 parts by weight to 45 parts by weight.
In the same manner as above, a heat-sensitive adhesive coating solution was finished. (Production of Heat-Sensitive Adhesive Sheet Having Antibacterial Property) The same heat-sensitive adhesive as that of Example 1 was coated with the above heat-sensitive adhesive at 25 g / m ² and dried to obtain the heat-sensitive adhesive having the antibacterial property of the present invention. A pressure-sensitive adhesive sheet was obtained.

Example 5 (Production of Substrate Having Antibacterial Property) 15 parts by weight of pulp powder, microcapsule liquid containing phytoncide obtained in Example 3 and acrylic acid ester-acrylic acid copolymer (average degree of polymerization) 300 to 400) 10 parts by weight was added to obtain a capsule coating liquid. The above capsule coating liquid was applied to a wood free paper having a basis weight of 64 g / m ^{2 by} an air knife coater so that the dry weight was 4 g / m ^2, and dried to obtain a surface base material.

(Production of heat-sensitive adhesive sheet having antibacterial property) In the same manner as in Example 3 except that the above-mentioned substrate was used, a heat-sensitive adhesive sheet having antibacterial property of the present invention was obtained. .

Example 6 (Production of antibacterial base material) An antibacterial agent having silver supported on zirconium phosphate having an average particle size of 0.9 μm was kneaded at 25% with a polypropylene resin having a melt flow rate of 50, Antimicrobial masterbatch pellets were made. Further, the masterbatch pellets were diluted with polypropylene in which the antibacterial agent was not kneaded so that the antibacterial agent content was 0.5% by weight, and melt spinning was performed at 230 ° C. to obtain a long fiber non-woven fabric.

(Production of Thermosensitive Adhesive Sheet Having Antibacterial Property) In the same manner as in Example 3 except that the above-mentioned substrate was used, an antibacterial adhesive sheet of the present invention was obtained.

Example 7 (Production of base material having antibacterial properties) Softwood bleached kraft pulp
15 parts by weight, 75 parts by weight of hardwood bleached kraft pulp, cal
Voxymethyl cellulose quaternary ammonium salt (commodity
Name: CMC-BE, manufactured by Nichirin Chemical Co., Ltd.) Double
A paper machine consisting of 1 part by weight, 8 parts by weight of filler, and a sizing agent in a paper machine
Paper making and applying starch with size press coater
The amount is 1.0 g / m ^TwoCoated and dried to obtain the base material
Was. (Production of Thermosensitive Adhesive Sheet Having Antibacterial Property) In Example 3
In the same manner as in Example 3, except that the above base material was used.
Thus, an antibacterial heat-sensitive adhesive sheet of the present invention was obtained.

Comparative Example 1 (Production of heat-sensitive adhesive sheet) Commercial basis weight 84.9 g / m
² double-sided art paper (trade name: S Kinbo <73>, manufactured by Shin-Oji Paper Co., Ltd.) and the same heat-sensitive adhesive as in Example 1 (trade name: Cybinol X-386-846E, manufactured by Saiden Chemical Co., Ltd.) ) Was coated at 20 g / m ² and dried to obtain a heat-sensitive adhesive sheet.

The heat-sensitive adhesive sheet having antibacterial properties thus obtained was evaluated as follows, and the results are shown in Table 1.
It was shown to.

<Evaluation Items> [Adhesive Strength] The heat-sensitive adhesive sheet was activated by heating for 10 seconds in an oven heated to 100 ° C., and was adhered to a glass plate within 3 minutes after activation by heating. Two hours later, the adhesive strength to the glass plate was measured according to the method for measuring the normal adhesive strength of JISZ-0237 (unit: g / 25 mm).

[Test Method for Antibacterial Property] The strain to be tested is a bacterium species that is often used for testing textile products and exists under a general environment, and is a representative gram-negative bacterium, Klebsiella pneumoniae. (Klebsiella pneumoni
ae IF012732) and typical Gram-positive bacteria, Staphylococcus
aureus IF012732) was used.

As the medium, broth medium is usually used for pre-culture.
Normal agar medium was used for the main culture. The composition of each medium is as shown below. (Normal broth medium) Meat extract 5 g Peptone 10 g Sodium chloride 5 g Distilled water 1000 ml pH 7.0 (ordinary agar medium) Meat extract 5 g Peptone 10 g Sodium chloride 5 g Agar 15 g Distilled water 1000 ml pH 7.0

The test procedure is as follows. First, the test strain is cultivated in ordinary broth medium at 37 ° C. for 24 hours, and the culture solution is sterilized with high-pressure steam to give a bacterial concentration of 1
A test bacterial solution diluted to 0 ⁴ cells / ml was prepared.

Add 75 ml of this solution to an Erlenmeyer flask,
Next, the dry weight was sterilized by heating at 160 ° C for 2 hours.
0 g of heat-sensitive adhesive sheet (test piece) was put. afterwards,
The Erlenmeyer flask was placed on a shaker and 340 r. p.
m. The test pieces were sufficiently contacted with the bacteria in the bacterial solution by shaking at 28 ° C for 60 minutes.

Next, 10-fold dilution series from 10 times to 100,000 times of the bacterial solution was prepared, and 1 m of bacterial solution of each concentration was prepared.
1 and 15 ml of normal agar medium were used to make plates by the pour method. After culturing in a 37 ° C incubator for 48 hours,
The number of colonies was counted, and the sterilization rate against the number of bacteria before contact was calculated to evaluate the antibacterial property. Sterilization rate (%) = (Number of bacteria before contact-Number of bacteria after contact) / Number of bacteria before contact x 100 The higher the sterilization rate, the stronger the antibacterial property, but the sterilization rate is 65% or more. It can be said that it has antibacterial properties. Two types of test pieces (heat-sensitive adhesive sheet) were used to judge the persistence of antibacterial properties: one immediately after production (initial value) and one left for 3 months (after 3 months). .

[Comprehensive Evaluation] The performance of the heat-sensitive adhesive sheet having antibacterial properties of the present invention was evaluated by combining the above evaluations. ⊚: The adhesive performance and antibacterial property were very excellent. ◯: The adhesive performance and antibacterial property were excellent. Δ: Adhesive performance or antibacterial property was slightly inferior, but there was no problem in practical use. X: Poor practicality due to poor adhesion performance or antibacterial property.

[0047]

[Table 1]

[0048]

As is clear from the results of Table 1, the antibacterial heat-sensitive adhesive sheet of the present invention is excellent when used as a packaging for foods, pharmaceuticals, etc. or as a wallpaper for building interiors. It was a heat-sensitive adhesive sheet exhibiting antibacterial properties.

Claims (4)

[Claims] 1. A heat-sensitive adhesive sheet comprising a substrate and a heat-sensitive adhesive layer comprising a thermoplastic resin and a solid plasticizer as main components, wherein the substrate and / or the heat-sensitive adhesive layer is antibacterial. A heat-sensitive adhesive sheet comprising: 2. The sheet according to claim 1, wherein the base material is a sheet containing at least one selected from zirconium phosphate carrying silver, carboxymethylcellulose silver salt, carboxymethylcellulose quaternary ammonium salt and phytoncide. Thermosensitive adhesive sheet. 3. The heat-sensitive adhesive sheet according to claim 1, wherein the heat-sensitive adhesive layer contains a phytoncide component. 4. The heat-sensitive adhesive sheet according to claim 2, which contains microcapsules containing a phytoncide component.