Adhesion reducing agent for water-soluble adhesives, method for manufacturing the same, method for peeling off water-soluble adhesives, and method for removing water-soluble adhesives.

Abstract

The present invention provides an adhesive strength reducing agent for water-soluble adhesives that can weaken the adhesive strength of the adhesive and does not easily penetrate into the adhesive itself. [Solution] This is an adhesion reducer for water-soluble adhesives, comprising 94% to 98% by weight of water, 0.1% to 0.5% by weight of a surfactant, 0.5% to 1.0% by weight of a thickener, and 2.5% to 5.0% by weight of a water-soluble solvent. Such an adhesion reducer for water-soluble adhesives can weaken the adhesive strength of the adhesive and make it difficult for the agent to penetrate into the interior of the adhesive.

Description

Technical Field

[0001] The present invention relates to an adhesive force reducing agent for a water-soluble adhesive that reduces the adhesive force of the water-soluble adhesive, a method for producing the same, a method for peeling a water-soluble adhesive using the adhesive force reducing agent for the water-soluble adhesive, and a method for removing the water-soluble adhesive, particularly to an adhesive force reducing agent for a water-soluble adhesive that can reduce the adhesive force of the water-soluble adhesive used when adhering wallpaper used for interior decoration of houses and the like to a wall surface, a method for producing the same, a method for peeling a water-soluble adhesive using the adhesive force reducing agent for the water-soluble adhesive, and a method for removing the water-soluble adhesive.

Background Art

[0002] Wallpaper used for interior decoration of houses and the like is firmly adhered to a base material or a wall surface using a water-soluble adhesive. However, when repairing walls or replacing wallpaper in houses and the like, it is required that the wallpaper can be easily and quickly peeled off from the base material or the wall surface, and further peeled off so that the traces of the peeled wallpaper are clean.

[0003] In order to meet such requirements, a peeling agent for an adhesive is used. As such a peeling agent, for example, a wallpaper peeling composition comprising (A) 0.01 to 10% by weight of a silicone-based surfactant, (B) 0.1 to 30% by weight of a humectant, and (C) the balance of water has been proposed (see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, with conventional adhesive removers as described above, if the remover is applied (penetrated) to one side of the adhesive, the remover penetrates into the adhesive and reaches the other side. As a result, there is a problem that it may adversely affect the surface of the object to which the adhesive is bonded. In particular, when conventional adhesive removers are used with water-soluble adhesives that bond wallpaper to a wall surface, the remover penetrates to the wall surface (e.g., gypsum board), causing the wall surface to become rough (adversely affecting it).

[0006] Furthermore, when applying adhesive to wallpaper and installing it on the substrate, water-soluble adhesive can adhere to the surface of already installed wallpaper, or water-soluble adhesive on the installer's hands can adhere to the surface of the wallpaper being installed. In such cases, the adhering water-soluble adhesive becomes an obstacle, making it impossible to neatly apply the new wallpaper. Currently, water-soluble adhesive that has adhered to the wall surface cannot be removed by pouring hot water on it or by trying to remove it with masking tape, and there is no readily available remover that can easily remove it.

[0007] In view of the above circumstances, the present invention aims to provide an adhesive strength reducing agent for water-soluble adhesives that can reduce the adhesive strength of the adhesive and does not adversely affect the surface of the object to which the adhesive is bonded (it does not easily penetrate into the water-soluble adhesive), a method for manufacturing the same, a method for peeling off a water-soluble adhesive using the adhesive strength reducing agent for water-soluble adhesives, and a method for removing a water-soluble adhesive.

[0008] Furthermore, these problems (issues) do not preclude the existence of other problems. Also, the embodiments of the present invention described later do not need to solve all of these problems (issues). Moreover, it is possible to extract other problems (issues) from the description, drawings, or claims. [Means for solving the problem]

[0009] As a result of diligent research into the above-mentioned problems, the inventors of the present invention have discovered the following groundbreaking adhesive strength reducing agent for water-soluble adhesives, a method for manufacturing the same, and a method for peeling water-soluble adhesives and removing water-soluble adhesives using the adhesive strength reducing agent for water-soluble adhesives.

[0010] A first aspect of the present invention for solving the above problems is an adhesive strength reducing agent for water-soluble adhesives, characterized by comprising 94% to 98% by weight of water, 0.1% to 0.5% by weight of a surfactant, 0.5% to 1.0% by weight of a thickener, and 2.5% to 5.0% by weight of a water-soluble solvent.

[0011] According to this first embodiment, it is possible to provide an adhesive strength reducing agent for water-soluble adhesives that can reduce the adhesive strength of the adhesive and does not adversely affect the surface of the object to which the adhesive is bonded (it does not easily penetrate into the adhesive). Furthermore, this adhesive strength reducing agent for water-soluble adhesives can easily remove water-soluble adhesive that has adhered to the surface of an object.

[0012] Furthermore, the adhesive strength reducing agent for water-soluble adhesives according to the present invention can be used as both a release agent for water-soluble adhesives and a removal agent for water-soluble adhesives.

[0013] A second aspect of the present invention is that the surfactant is at least one selected from the group consisting of anionic surfactants, nonionic surfactants, cationic surfactants, fluorinated surfactants, and silicone surfactants, and the anionic surfactants are sodium uryl sulfate, sodium polyoxyethylene lauryl ether sulfate, methylbenzenesulfonic acid, ethylbenzenesulfonic acid, propylbenzenesulfonic acid, isopropylbenzenesulfonic acid, sodium dodecylbenzenesulfonate, sodium methylnaphthalenesulfonate, sodium ethylnaphthalenesulfonate, sodium propylnaphthalenesulfonate, sodium isopropylnaphthalenesulfonate, sodium dimethyl sulfosuccinate, sodium diethyl sulfosuccinate, sodium dipropyl sulfosuccinate, sodium diisopropyl sulfosuccinate, sodium methyl diphenyl ether disulfonate, sodium ethyl diphenyl ether disulfonate, sodium propyl diphenyl ether disulfonate, sodium isopropyl diphenyl ether disulfonate, sodium diisopropyl diphenyl ether disulfonate, and the nonionic surfactants are polyoxyethylene lauryl ether disulfonate. The first embodiment of the adhesive strength reducing agent for water-soluble adhesives is characterized in that the surfactants are ethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkylene alkyl ether, polyoxyethylene glyceryl ether, sorbitan monolaurate, sorbitan tristearate, sorbitan monostearate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan tetraoleate, polyoxyethylene glycol monolaurate, polyoxyethylene monostearate, and polyoxyethylene distearate; the cationic surfactants are lauryltrimethylammonium chloride, stearyltrimethylammonium chloride, and stearylamine acetate; the fluorine-based surfactants are perfluorooctanesulfonic acid, perfluorooctanoic acid, perfluorolauryl ether, and perfluorosulfonic acid; and the silicone-based surfactant is a polyoxyethylene methylpolysiloxane copolymer.

[0014] According to this second embodiment, it is possible to provide an adhesive strength reducing agent for water-soluble adhesives that can further reduce the adhesive strength of the adhesive.

[0015] A third aspect of the present invention is an adhesion reducer for water-soluble adhesives according to the second aspect, characterized in that the surfactant is at least two types selected from the group consisting of anionic surfactants, nonionic surfactants, cationic surfactants, fluorine-based surfactants, and silicone-based surfactants, and the two types of surfactants are surfactants that belong to different systems from among anionic surfactants, nonionic surfactants, cationic surfactants, fluorine-based surfactants, and silicone-based surfactants.

[0016] According to this third embodiment, even if at least one of two objects bonded together with a water-soluble adhesive is flame-retardant (for example, flame-retardant wallpaper or backing material), these objects can be easily and cleanly separated with virtually no water-soluble adhesive remaining on either one.

[0017] Here, "flame-retardant treated" refers to materials that have been given flame retardancy by applying or impregnating them with flame retardants. Flame-retardant treated non-combustible paper can be manufactured by impregnating or internally adding inorganic phosphorus-based or nitrogen-containing compounds, aluminum hydroxide, polyacrylamide, calcium carbonate, etc. Examples of flame retardants include guanidine sulfamate, guanidine phosphate, and ammonium sulfamate. For evaluation of flame retardancy, known evaluation methods can be used; for example, the flame retardancy of backing material can be evaluated by the method specified in JIS A1322.

[0018] A fourth aspect of the present invention is an adhesion-reducing agent for water-soluble adhesives according to the first aspect, further comprising a proteolytic enzyme.

[0019] According to such a fourth aspect, the activity of the surfactant contained in the adhesive force reducing agent for the water-soluble adhesive is improved, and the wettability is improved. As a result, the two objects adhered by the water-soluble adhesive can be more easily and neatly separated with almost no water-soluble adhesive remaining on either one of them.

[0020] A fifth aspect of the present invention is the adhesive force reducing agent for a water-soluble adhesive according to the fourth aspect, wherein the proteolytic enzyme is at least one of amylase, pepsin, lipase and peptidase.

[0021] According to such a fifth aspect, the activity of the surfactant is further improved, and the wettability is further improved. As a result, the two objects adhered by the water-soluble adhesive can be even more easily and neatly separated with almost no water-soluble adhesive remaining on either one of them.

[0022] A sixth aspect of the present invention is the adhesive force reducing agent for a water-soluble adhesive according to the first aspect, wherein the thickener is one or more selected from the group consisting of starch, agar, pectin, xanthan gum, carrageenan, guar gum, acrylic acid, acrylic acid ester, methacrylic acid ester polymer and acrylic polymer.

[0023] According to such a sixth aspect, it is possible to provide an adhesive force reducing agent for a water-soluble adhesive that is difficult to penetrate inside the adhesive.

[0024] A seventh aspect of the present invention is the adhesive force reducing agent for a water-soluble adhesive according to the first aspect, wherein the water-soluble solvent is alcohol.

[0025] According to such a seventh aspect, the adhesive force reducing agent for a water-soluble adhesive can be easily manufactured.

[0026] An eighth aspect of the present invention is the adhesive force reducing agent for a water-soluble adhesive according to the first aspect, wherein the viscosity is 0.1 Pa·s to 30000 Pa·s.

[0027] According to such an eighth aspect, it is possible to provide an adhesive strength reducing agent for a water-soluble adhesive, which is difficult to penetrate inside the adhesive.

[0028] A ninth aspect of the present invention resides in the adhesive strength reducing agent for a water-soluble adhesive according to the first aspect, wherein the pH is 3 to 10.

[0029] According to such a ninth aspect, it is possible to provide an adhesive strength reducing agent for a water-soluble adhesive, which does not adversely affect the surfaces of two objects adhered by the water-soluble adhesive.

[0030] A tenth aspect of the present invention resides in the adhesive strength reducing agent for a water-soluble adhesive according to the first aspect, which is disposed between a first object and a second object and peels off a water-soluble adhesive that adheres the first object and the second object from the first object or the second object.

[0031] According to such a tenth aspect, the first object and the second object can be easily and neatly separated in a state where almost no water-soluble adhesive remains on either one. Further, by using this adhesive strength reducing agent for a water-soluble adhesive, the water-soluble adhesive can be peeled off without adversely affecting an object adhered to a surface (the other surface) opposite to the surface (one surface) of the water-soluble adhesive to which this adhesive strength reducing agent for a water-soluble adhesive is applied.

[0032] An eleventh aspect of the present invention resides in the adhesive strength reducing agent for a water-soluble adhesive according to the tenth aspect, wherein the first object is wallpaper and the second object is a wall.

[0033] According to such an eleventh aspect, it is possible to provide an adhesive strength reducing agent for a water-soluble adhesive, which can neatly peel off the wallpaper from the wall surface (with almost no adhesive remaining on the wall surface) without adversely affecting the wall.

[0034] Here, the "wallpaper" is not particularly limited as long as the adhesive strength reducing agent for a water-soluble adhesive can penetrate from one surface to the other surface.

[0035] A twelfth aspect of the present invention is a method for producing an adhesion-reducing agent for a water-soluble adhesive according to the first aspect, characterized by comprising: a first step of mixing a thickener with a water-soluble solvent to prepare a mixed solution; and a second step of adding the mixed solution to a solution containing a surfactant and water.

[0036] According to this twelfth embodiment, an adhesive strength reducing agent for water-soluble adhesives can be easily manufactured that can weaken the adhesive strength of the adhesive and does not easily penetrate into the interior of the adhesive.

[0037] A thirteenth aspect of the present invention is a method for producing an adhesive strength reducing agent for water-soluble adhesives according to the eighth aspect, characterized in that the weight ratio of the thickener to the water-soluble solvent in the first step is 100:5 to 100:50.

[0038] According to this 13th embodiment, since the thickening agent is easily dispersed, the adhesive strength reducing agent for water-soluble adhesives can be manufactured more easily.

[0039] A fourteenth aspect of the present invention is a method for removing a water-soluble adhesive, characterized by comprising: a release agent application step of applying the adhesion reducing agent for water-soluble adhesives described in the eleventh aspect to the surface of a first object opposite to the second object; and a peeling step of peeling the first object from the second object after a predetermined time has elapsed.

[0040] According to this 14th embodiment, it is possible to provide an adhesive strength reducing agent for water-soluble adhesives that can remove wallpaper cleanly from the wall surface (leaving almost no adhesive residue on the wall surface) without adversely affecting the wall.

[0041] A fifteenth aspect of the present invention is a method for removing a water-soluble adhesive according to the fourteenth aspect, characterized in that a surface layer is provided on the surface of a first object, and after the surface layer is removed, the method comprises a step of applying a release agent and a step of peeling.

[0042] Here, the "surface layer" is not particularly limited and may be composed of, for example, polyvinyl chloride resin.

[0043] According to this 15th embodiment, even wallpaper with a surface layer can be peeled off cleanly from the wall surface (with almost no adhesive residue left on the wall surface) without adversely affecting the wall, and an adhesive reducing agent for water-soluble adhesives can be provided.

[0044] A sixteenth aspect of the present invention is a method for removing a water-soluble adhesive, characterized by comprising: an adhesion-reducing agent application step of applying an adhesion-reducing agent for water-soluble adhesives described in the first aspect to a water-soluble adhesive adhering to the surface of an object; and an adhesive removal step of removing the water-soluble adhesive after a second predetermined time has elapsed.

[0045] According to this 16th embodiment, water-soluble adhesive adhering to the surface of an object can be easily removed. [Brief explanation of the drawing]

[0046] [Figure 1] Figure 1 is a table showing the compositions of Examples 1 to 6. [Figure 2] Figure 2 is a table showing the results of the peel test for Examples 1 to 6. [Figure 3] Figure 3 is a table showing the compositions of Examples 7 to 11. [Figure 4] Figure 4 is a table showing the results of the peel test for Examples 7-11. [Figure 5] Figure 5 shows the state (1) when the adhesive strength reducing agent for water-soluble adhesives of Example 7 was applied to a portion of the surface of gum tape attached to the interior wall of a building, and a photograph of the state after a portion of the gum tape was peeled off. [Modes for carrying out the invention]

[0047] The following describes embodiments of the adhesive strength reducing agent for water-soluble adhesives according to the present invention, a method for producing the same, and a method for removing water-soluble adhesives using the adhesive strength reducing agent for water-soluble adhesives, with reference to the attached drawings. However, the present invention is not limited to the embodiments described below.

[0048] (Embodiment 1) The adhesion reducing agent for water-soluble adhesives according to this embodiment is placed between a first object and a second object and is used to detangle the water-soluble adhesive that bonds the first object and the second object from the first object or the second object. Here, the notations "first object" and "second object" are for convenience only, and it goes without saying that the second object may also be the first object.

[0049] The first and second objects are not particularly limited and may be the same or different. Examples of combinations of the first and second objects include wallpaper and a wall (wall surface), masking tape and cardboard, and an envelope and a stamp.

[0050] Furthermore, the adhesive strength reducing agent for water-soluble adhesives contains 94% to 98% by weight of water, 0.1% to 0.5% by weight of a surfactant, 0.5% to 1.0% by weight of a thickener, and 2.5% to 5.0% by weight of a water-soluble solvent. Preferably, it contains 90% to 99% by weight of water, 1.0% to 10.0% by weight of a surfactant, 2.0% to 8.0% by weight of a thickener, and 1.0% to 10.0% by weight of a water-soluble solvent. Particularly preferred is a mixture of 93% to 96% by weight of water, 1.0% to 4.0% by weight of a surfactant, 2.0% to 4.0% by weight of a thickener, and 2.0% to 5.0% by weight of a water-soluble solvent.

[0051] First, let's explain surfactants. While surfactants are not particularly limited, anionic surfactants, nonionic surfactants, cationic surfactants, fluorinated surfactants, and silicone surfactants are preferred. Note that the same surfactant may be included in different surfactant systems.

[0052] Examples of anionic surfactants include sodium uryl sulfate, sodium polyoxyethylene lauryl ether sulfate, methylbenzenesulfonic acid, ethylbenzenesulfonic acid, propylbenzenesulfonic acid, isopropylbenzenesulfonic acid, sodium dodecylbenzenesulfonate, sodium methylnaphthalenesulfonate, sodium ethylnaphthalenesulfonate, sodium propylnaphthalenesulfonate, sodium isopropylnaphthalenesulfonate, sodium dimethyl sulfosuccinate, sodium diethyl sulfosuccinate, sodium dipropyl sulfosuccinate, sodium diisopropyl sulfosuccinate, sodium methyl diphenyl ether disulfonate, sodium ethyl diphenyl ether disulfonate, sodium propyl diphenyl ether disulfonate, isopropyl diphenyl ether disulfonate, and sodium diphenyl ether disulfonate.

[0053] Examples of nonionic surfactants include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkylene alkyl ether, polyoxyethylene glyceryl ether, sorbitan monolaurate, sorbitan tristearate, sorbitan monostearate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan tetraoleate, polyoxyethylene glycol monolaurate, polyoxyethylene monostearate, and polyoxyethylene distearate.

[0054] Examples of cationic surfactants include lauryltrimethylammonium chloride, stearyltrimethylammonium chloride, and stearylamine acetate.

[0055] Examples of fluorine-based surfactants include perfluorooctanesulfonic acid, perfluorooctanoic acid, and perfluorolauryl ether.

[0056] Examples of silicone-based surfactants include polyoxyethylene methylpolysiloxane copolymers.

[0057] Furthermore, the surfactant only needs to contain at least one of the substances described above, but it is preferable to have at least two surfactants, each belonging to a different system. The combination of the two surfactants is not particularly limited, but a combination of a nonionic surfactant and an anionic surfactant is preferred. An example of a combination of a nonionic surfactant and an anionic surfactant is a combination of at least one of the nonionic surfactants, such as polyoxyethylene lauryl ether, polyoxyethylene alkyl ether, and polyoxyethylene alkylene alkyl ether, and at least one of the anionic surfactants, such as sodium lauryl sulfate, sodium alkylbenzenesulfonate, sodium dodecylbenzenesulfonate, and sodium dialkyl sulfosuccinate.

[0058] By using at least two surfactants, each belonging to a different system, it is possible to easily and cleanly separate the first and second objects, even if at least one of them has been flame-retardant treated, leaving virtually no adhesive residue on either object. Needless to say, it is also possible to use three or more surfactants.

[0059] Next, we will explain thickeners. Thickeners are not particularly limited, but examples include starch, agar, pectin, xanthan gum, carrageenan, guar gum, acrylic acid, acrylic acid esters, methacrylate polymers, and acrylic polymers.

[0060] Furthermore, water-soluble solvents will be explained. While water-soluble solvents are not particularly limited as long as they are water-soluble, alcohols are preferred. Examples of alcohols include methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, ethylene glycol, propylene glycol, and N-methyl-2-pyrrolidone (NMP).

[0061] Furthermore, the type of water used is not particularly limited; for example, distilled water, pure water, tap water, or purified water can be used.

[0062] Furthermore, substances other than those mentioned above may be included in the adhesion-reducing agent for water-soluble adhesives, for example, an antifungal agent may be included. Examples of antifungal agents include orthophenylphenol, imazalil, and thiabendazole, with thiabendazole being preferred.

[0063] The viscosity of the adhesion reducer for water-soluble adhesives containing the substances described above is not particularly limited, but it is preferably between 0.1 Pa·s and 30,000 Pa·s. If the viscosity of the adhesion reducer for water-soluble adhesives is less than 0.1 Pa·s, it will penetrate the water-soluble adhesive, causing the surface of the wall to become rough (adversely affecting it). On the other hand, if the viscosity of the adhesion reducer for water-soluble adhesives is greater than 30,000 Pa·s, the adhesion reducer will not penetrate the water-soluble adhesive, and will not be able to weaken the adhesive strength of the adhesive. The viscosity of the adhesion reducer for water-soluble adhesives can be measured, for example, by a B-type viscometer.

[0064] Furthermore, while the pH of the adhesion reducer for water-soluble adhesives is not particularly limited, it is preferably between 3 and 10, more preferably between 4 and 8, and especially preferably between 6 and 7. If the pH of the adhesion reducer for water-soluble adhesives is less than 3, the adhesion reducer will discolor. On the other hand, if the pH of the adhesion reducer for water-soluble adhesives is greater than 10, the peeling force of the adhesion reducer will be drastically reduced.

[0065] The aforementioned adhesive strength reducing agent for water-soluble adhesives does not penetrate when applied to one side of the adhesive, and therefore does not adversely affect the object bonded to the other side of the adhesive.

[0066] <Method for manufacturing an adhesive strength reducing agent for water-soluble adhesives> The adhesion reducer for water-soluble adhesives according to this embodiment can be prepared by mixing water, a surfactant, a thickener, and a water-soluble solvent in the weight ratio described above. The equipment used to mix these substances is not limited. The temperature, pressure, and humidity during mixing are also not particularly limited, but a temperature of 20°C to 40°C is preferred. Mixing becomes difficult if the temperature is lower than 20°C. On the other hand, if the temperature is higher than 40°C, drying occurs quickly, which reduces the peeling force (adhesion reducing effect) of the adhesion reducer for water-soluble adhesives.

[0067] Furthermore, the method for producing an adhesion reducer for water-soluble adhesives according to the present invention preferably comprises a first step of mixing a thickener with a water-soluble solvent to prepare a mixture, and a second step of adding the mixture to a solution containing a surfactant and water. Here, the solution containing a surfactant and water may be a solution containing only a surfactant and water, a solution containing water and components other than a surfactant, or a solution containing water, a surfactant and a water-soluble solvent. By using a method for producing an adhesion reducer for water-soluble adhesives that includes such steps, an adhesion reducer for water-soluble adhesives with a viscosity within the above range can be easily produced.

[0068] Furthermore, the weight ratio of the thickener to the water-soluble solvent in the first step is preferably 100:5 to 100:50, more preferably 100:10 to 100:30, and particularly preferably 100:20 to 100:30. If the weight ratio of the water-soluble solvent to the thickener is less than 5, the thickener will not disperse easily. On the other hand, if the weight ratio of the water-soluble solvent to the thickener is greater than 50, the thickener will precipitate.

[0069] <Method for removing water-soluble adhesives> The method for removing a water-soluble adhesive according to the present invention comprises a release agent application step of applying a water-soluble adhesive reducing agent according to the present invention to the surface of the wallpaper opposite to the wall, and a peeling step of peeling the wallpaper from the wall after a first predetermined time has elapsed.

[0070] Here, the first predetermined time is not particularly limited, but 20 to 30 minutes is preferred. The temperature during standing is preferably 5°C to 35°C, and more preferably 15°C to 25°C. If the temperature is lower than 5°C, the components of the adhesion reducer for water-soluble adhesives will separate. On the other hand, if the temperature exceeds 35°C, the components of the adhesion reducer for water-soluble adhesives may change.

[0071] <Method for removing water-soluble adhesives> The method for removing a water-soluble adhesive according to the present invention comprises an adhesion-reducing agent application step of applying an adhesion-reducing agent for water-soluble adhesives according to the present invention to the water-soluble adhesive adhering to the surface of an object, and an adhesive removal step of removing the water-soluble adhesive after a second predetermined time has elapsed.

[0072] Here, the second predetermined time is not particularly limited, but 20 to 30 minutes is preferred. The temperature during standing is preferably 5°C to 35°C, and more preferably 15°C to 25°C. If the temperature is lower than 5°C, the components of the adhesion reducer for water-soluble adhesives will separate. On the other hand, if the temperature exceeds 35°C, the components of the adhesion reducer for water-soluble adhesives may change.

[0073] <<Examples 1-6>> <Peel test> Using a water-soluble starch paste adhesive (24 g / mm), the first object, wallpaper [surface: vinyl chloride resin / backing: paper (100% pulp), size: 910 mm wide x 2400 mm high], was bonded (applied) to the second object, an interior wall surface of a building (5.4 m wide x 2400 mm high), and dried. After that, the vinyl chloride resin surface layer was peeled off from the wallpaper.

[0074] Next, adhesive strength reducing agents for water-soluble adhesives (Examples 1-6) shown in Figure 1 were prepared and applied to the opposite side of the wallpaper (backing) from the wall (the side where the surface layer was located) (release agent application step). After leaving it for 20 minutes, a peeling experiment was conducted (experimental temperature: 28°C) in which the wallpaper (backing) was peeled off from the wall (peeling step). The evaluation results are shown in Figure 2.

[0075] In Figure 2, ○ indicates that the wallpaper (backing) can be removed cleanly with little adhesive residue remaining on the interior wall surface of the building, and ◎ indicates that the wallpaper (backing) can be removed very cleanly with almost no adhesive residue remaining on the interior wall surface of the building.

[0076] As can be seen from these figures, it has been found that by using the adhesive strength reducing agent for water-soluble adhesives according to the present invention, wallpaper (backing) can be cleanly removed from the interior wall surface of a building with very little adhesive residue remaining.

[0077] <Removal Test> On the surface of the object, wallpaper [Surface: vinyl chloride resin / Backing: paper (100% pulp), Size: 910mm wide x 2400mm high], an area of ​​0.01m² 2 Several pieces of water-soluble adhesive that had solidified to a certain extent were attached.

[0078] Next, the adhesive reducing agents for water-soluble adhesives from Examples 1 to 6 were applied to the water-soluble adhesive and left for 20 minutes. After that, the water-soluble adhesive was removed using a sponge or cloth. As a result, it was found that the water-soluble adhesive could be completely removed from the wallpaper using any of the adhesive reducing agents for water-soluble adhesives from Examples 1 to 6.

[0079] Furthermore, when a similar test was conducted using wallpaper (EcoFleece F11 (manufactured by Nagai Co., Ltd.)), it was found that the water-soluble adhesive could be cleanly removed from the wallpaper using any of the water-soluble adhesive reducing agents from Examples 1 to 6.

[0080] (Embodiment 2) The adhesion reducer for water-soluble adhesives in Embodiment 1 consisted of water, a surfactant, a thickener, and a water-soluble solvent, but the present invention is not limited thereto. For example, a proteolytic enzyme may be added to further constitute the adhesion reducer for water-soluble adhesives.

[0081] The added proteolytic enzyme is not particularly limited, but examples include amylase, pepsin, lipase, and peptidase. The amount of added proteolytic enzyme is preferably 0.001% to 5.0% by weight, and more preferably 0.01% to 1.0% by weight. If the amount of proteolytic enzyme is less than 0.001% by weight, the surfactant contained in the adhesion-reducing agent for water-soluble adhesives cannot be sufficiently activated. On the other hand, the effect does not change even if the amount of proteolytic enzyme is greater than 5.0% by weight. Furthermore, the timing of adding the proteolytic enzyme is not particularly limited.

[0082] The adhesion reducer for water-soluble adhesives configured in this way enhances the activity of the surfactant contained in the adhesion reducer for water-soluble adhesives, thereby improving wettability. As a result, the first object and the second object can be separated more easily and cleanly, with almost no adhesive residue remaining on either one.

[0083] <<Examples 7-11>> <Peel test> Using a water-soluble starch paste adhesive (24 g / mm), the first object, wallpaper [surface: vinyl chloride resin / backing: paper (100% pulp), size: 910 mm wide x 2400 mm high], was bonded (applied) to the second object, an interior wall surface of a building (5.4 m wide x 2400 mm high), and dried. After that, the vinyl chloride resin surface layer was peeled off from the wallpaper.

[0084] Next, as shown in Figure 3, adhesive strength reducing agents for water-soluble adhesives containing enzymes (proteases) (Examples 7-11) were prepared and applied to the surface of wallpaper (backing) opposite to the wall (the surface where the surface layer was located), and peeling experiments were conducted to remove the wallpaper (backing) from the wall (experimental temperature: 28°C). The evaluation results are shown in Figure 4.

[0085] In Figure 4, ○ indicates that the wallpaper (backing) can be removed cleanly with little adhesive residue remaining on the interior wall surface of the building, and ◎ indicates that the wallpaper (backing) can be removed very cleanly with almost no adhesive residue remaining on the interior wall surface of the building. This evaluation shows that the wallpaper (backing) can be removed even more cleanly than the evaluation shown in Figure 2.

[0086] As can be seen from these figures, it has been found that by using the adhesive strength reducing agent for water-soluble adhesives according to the present invention, which further contains enzymes, it is possible to remove wallpaper (backing) more cleanly with minimal adhesive residue remaining on the interior wall surface of buildings.

[0087] Furthermore, the adhesive reducing agent for water-soluble adhesives according to Example 7 was applied to the upper right portion of the surface of a piece of gum tape (60YZ (manufactured by NichiRica Co., Ltd.)) attached to the interior wall surface of a building (see Figure 5(1)), and then the gum tape in that upper right portion was peeled off (see Figure 5(2)). As can be seen from these figures, it was found that even gum tape attached to the interior wall surface of a building can be cleanly removed without leaving much adhesive residue on the interior wall surface by using the adhesive reducing agent for water-soluble adhesives according to the present invention.

Claims

1. An adhesive strength reducing agent for water-soluble adhesives that reduces the adhesive strength of water-soluble adhesives, 94% to 98% by weight of water, A surfactant in an amount of 0.1% to 0.5% by weight, A thickening agent in an amount of 0.5% to 1.0% by weight, 2.5% to 5.0% by weight of a water-soluble solvent, An adhesive strength reducing agent for water-soluble adhesives, characterized by containing the following:

2. The surfactant is at least one selected from the group consisting of anionic surfactants, nonionic surfactants, cationic surfactants, fluorine-based surfactants, and silicone-based surfactants. The aforementioned anionic surfactants are sodium uryl sulfate, sodium polyoxyethylene lauryl ether sulfate, methylbenzenesulfonic acid, ethylbenzenesulfonic acid, propylbenzenesulfonic acid, isopropylbenzenesulfonic acid, sodium dodecylbenzenesulfonate, sodium methylnaphthalenesulfonate, sodium ethylnaphthalenesulfonate, sodium propylnaphthalenesulfonate, sodium isopropylnaphthalenesulfonate, sodium dimethyl sulfosuccinate, sodium diethyl sulfosuccinate, sodium dipropyl sulfosuccinate, sodium diisopropyl sulfosuccinate, sodium methyl diphenyl ether disulfonate, sodium ethyl diphenyl ether disulfonate, sodium propyl diphenyl ether disulfonate, isopropyl diphenyl ether disulfonate, sodium diphenyl ether disulfonate. The nonionic surfactants mentioned above are polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkylene alkyl ether, polyoxyethylene glyceryl ether, sorbitan monolaurate, sorbitan tristearate, sorbitan monostearate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan tetraoleate, polyoxyethylene glycol monolaurate, polyoxyethylene monostearate, and polyoxyethylene distearate. The cationic surfactants mentioned above are lauryltrimethylammonium chloride, stearyltrimethylammonium chloride, and stearylamine acetate. The aforementioned fluorine-based surfactants are perfluorooctanesulfonic acid, perfluorooctanoic acid, perfluorolauryl ether, and perfluorosulfonic acid. The aforementioned silicone-based surfactant is a polyoxyethylene methylpolysiloxane copolymer. The adhesive strength reducing agent for water-soluble adhesives according to feature 1.

3. The surfactant is at least two types selected from the group consisting of the anionic surfactant, the nonionic surfactant, the cationic surfactant, the fluorine-based surfactant, and the silicone-based surfactant. The two types of surfactants are surfactants that belong to different systems from among the anionic surfactant, the nonionic surfactant, the cationic surfactant, the fluorine surfactant, and the silicone surfactant. The adhesive strength reducing agent for water-soluble adhesives according to feature 2.

4. It also contains proteolytic enzymes, The adhesive strength reducing agent for water-soluble adhesives according to feature 1.

5. The aforementioned proteolytic enzyme is at least one of amylase, pepsin, lipase, and peptidase. The adhesive strength reducing agent for water-soluble adhesives according to feature 4.

6. The thickening agent is one or more selected from the group consisting of starch, agar, pectin, xanthan gum, carrageenan, guar gum, acrylic acid, acrylic acid esters, methacrylate polymers, and acrylic polymers. The adhesive strength reducing agent for water-soluble adhesives according to feature 1.

7. The adhesive strength reducing agent for water-soluble adhesives according to claim 1, characterized in that the water-soluble solvent is an alcohol.

8. The adhesive strength reducing agent for water-soluble adhesives according to claim 1, characterized in that its viscosity is 0.1 Pa·s to 30,000 Pa·s.

9. The adhesive strength reducing agent for water-soluble adhesives according to claim 1, characterized in that the pH is 3 to 10.

10. The adhesive strength reducing agent for a water-soluble adhesive according to claim 1, which is placed between a first object and a second object to bond the first object and the second object together, and which causes the water-soluble adhesive to peel off from the first object or the second object.

11. The first object is wallpaper, The aforementioned second object is a wall. The adhesive strength reducing agent for water-soluble adhesives according to the feature described in 10.

12. A method for producing an adhesive strength reducing agent for a water-soluble adhesive according to claim 1, A first step involves mixing the aforementioned thickening agent with the aforementioned water-soluble solvent to prepare a mixed solution, A second step involves adding the aforementioned mixture to a solution containing the surfactant and the water, A method for producing an adhesive strength reducing agent for water-soluble adhesives, characterized by having the following characteristics.

13. The first step is characterized in that the weight ratio of the thickening agent to the water-soluble solvent is 100:5 to 100:

50. A method for producing an adhesive strength reducing agent for water-soluble adhesives according to claim 12.

14. A release agent application step of applying the adhesive strength reducing agent for water-soluble adhesives according to claim 11 to the surface of the wallpaper opposite to the wall, A peeling step is performed to remove the wallpaper from the wall after a predetermined time has elapsed. A method for removing a water-soluble adhesive, characterized by having the following features.

15. A surface layer is provided on the surface of the aforementioned wallpaper. After removing the surface layer, the process of applying the release agent and the process of removing the layer are carried out. A method for peeling off a water-soluble adhesive according to claim 14, characterized by having the following:

16. A step of applying an adhesive strength reducing agent to the water-soluble adhesive adhering to the surface of an object, the adhesive strength reducing agent for water-soluble adhesives according to claim 1, A second adhesive removal step, after a predetermined time has elapsed, to remove the water-soluble adhesive, A method for removing a water-soluble adhesive, characterized by having the following:

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