Construction method using adhesive layer-equipped natural wood decorative board, and adhesive layer-equipped natural wood decorative board in which adhesive layer is protected by release sheet

Abstract

To provide a natural wood decorative panel with a self-adhesive layer capable of being simply executed without irregularity by putting a natural material to practical use, and an execution method.SOLUTION: A non-carrier double-sided adhesive sheet having an adhesive layer 6 protected by a release sheet 7 is adhered in advance to "a reinforced sliced veneer 2 having a sliced veneer 3 obtained by slicing natural wood, an adhesive layer 4, and a base material 5" outside a construction site to manufacture a natural wood decorative plate 1 with an adhesive layer protected by the release sheet 7, and the natural wood decorative plate 1 is attached to a target surface while peeling off the release sheet 7 at the construction site. The adhesive layer 6 contains a (meth) acrylic ester, a polymerizable monomer other than the (meth) acrylic ester, a polymerization initiator, an adhesiveness-imparting compound, and fine particles and has a thickness of 10 μm or more and 500 μm or less, and a primer is applied in advance to a target surface having a large area in which two or more rectangles having a short side of 30cm or more and 303cm or less are arranged, and the decorative plate 1 is bonded thereon.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a "natural wood veneer board with an adhesive layer having a specific composition and specific form" in which the adhesive layer is formed in advance by a specific method outside the construction site, and to an "construction method using the natural wood veneer board with an adhesive layer at the construction site." [Background technology]

[0002] BACKGROUND ART The application of resin decorative panels to target surfaces such as interior and exterior walls, floors, ceilings, doors, and the like of buildings, as well as partitions and furniture, is widely practiced in order to impart waterproofing, moisture resistance, flame retardancy, fire resistance, decorative properties, and the like, and the outermost surface of such decorative panels is mainly formed from a resin sheet made of a synthetic resin such as polyvinyl chloride resin or melamine resin.

[0003] That is, currently, the decorative boards that are mainly used have, from the top down, at least a resin sheet, an adhesive layer for adhering the sheet to a substrate, and the substrate. Resin decorative panels are also known that have, on or between the surfaces, a protective layer that protects the surface against impacts, a patterned or colored layer that adds design, a flame-retardant layer that provides flame retardancy and fire resistance, a moisture-resistant layer that resists humidity, etc.

[0004] Known methods for applying a resin decorative panel to a target surface at a construction site or the like include having a worker at the construction site use an adhesive to attach it to the target surface, or having a method in which an adhesive layer is first laid on the bottom layer, the adhesive layer is protected with a release sheet, and then a worker at the construction site peels off the release sheet and attaches it to the target surface.

[0005] On the other hand, instead of the above-mentioned resin decorative boards whose top surface is formed from a resin sheet, natural wood decorative boards whose top surface is formed from a "veneer made by slicing natural wood" are also known. For example, Patent Document 1 discloses a flame-retardant decorative sheet made of fine wood, which has, from top to bottom, veneer, "paper or nonwoven fabric," metal foil, and another "paper or nonwoven fabric," with an adhesive layer between them. Patent Document 2 discloses a flame-retardant fine wood decorative sheet having, from the top, a fine wood veneer, an adhesive layer, a fibrous sheet, a thermoplastic resin layer, and another fibrous sheet in this order.

[0006] Patent Document 3 also discloses a flame-resistant fine wood decorative sheet that is made by laminating, from the top, a fine wood veneer, an adhesive layer, "paper or nonwoven fabric," a flame retardant layer, glass fiber cloth, an adhesive resin layer mixed with a flame retardant, and "paper or nonwoven fabric," and pressing them together to form a single unit.

[0007] Patent Document 4 discloses a flame-retardant fine wood decorative sheet formed by laminating, from the top, a transparent resin layer, a natural wood veneer, a heat-conductive sheet, and a backside thermoplastic resin layer, and then press-molding the laminate.

[0008] Patent Document 5 describes a natural wood tissue paper in which a backing sheet is adhered to the back surface of an extremely thin natural wood veneer, the thickness of the extremely thin veneer is polished with sandpaper to a thickness of 0.05 to 0.1 mm, and the thickness of the backing sheet is 0.03 to 0.1 mm. The application method described in Patent Document 5 involves first preparing the surface, then applying a starch-based adhesive, and then adhering the natural wood tissue paper.

[0009] Furthermore, Patent Document 6 discloses a veneer-covered decorative board in which a veneer, a layer containing a chelating agent, a moisture-proof sheet, and a wood-based substrate are laminated together from the top.

[0010] However, natural wood decorative panels are more expensive than resin decorative panels made of vinyl chloride resin or the like, and are therefore not widely used. Furthermore, because natural wood veneer is expensive, in order to give it an even more luxurious feel; even if an attempt was made to mass-produce a veneer in which an adhesive layer was previously applied to the bottom layer and protected with a release sheet, costs would increase due to the small lot sizes required for the construction site; and because adhesives with suitable adhesive properties and methods for applying them have not yet been developed; for these reasons, the method of applying natural wood veneer to the target surface at the construction site has been limited to workers at the construction site applying an adhesive such as starch paste to each sheet and attaching it to the target surface.

[0011] In recent years, decorative panels have become more and more luxurious, but this trend has been toward the luxury of the outermost layer, "a resin sheet such as polyvinyl chloride resin," rather than the use of "veneer made from sliced ​​natural wood."

[0012] Furthermore, Patent Document 7 describes a construction method in which a "self-adhesive layer forming liquid containing a (meth)acrylic copolymer, a tackifier resin and an organic solvent" is applied to the substrate side of "a reinforced veneer having a veneer made of natural wood, an adhesive layer, and a substrate" using a roll coater or curtain coater, and the organic solvent is evaporated under heat to form a self-adhesive layer, thereby producing a natural wood veneer with a self-adhesive layer, which is then attached to the target surface at the construction site. It is described that the tackifying resin is a resin that is liquid at 50°C and is contained in an amount of 5% by mass or more and 30% by mass or less relative to the entire self-adhesive layer, and further that the content (solids concentration) of the components of the self-adhesive layer in the self-adhesive layer forming liquid is 30% by mass or more and 50% by mass or less relative to the entire self-adhesive layer forming liquid.

[0013] In recent years, the level of skill of workers has declined, and the method in which workers at the construction site use adhesive to attach decorative panels to the target surface has resulted in variations in the finished product, and there was a need to solve this problem. Furthermore, with the decline in skill levels, there is a demand for technology and natural wood veneers that can be applied semi-permanently to target surfaces without any problems at the construction site.

[0014] In Patent Document 7, a self-adhesive layer is formed in advance in a factory or the like, and a coating liquid (self-adhesive layer forming liquid) in which the adhesive layer components are dissolved in a solvent is applied using a roll coater or curtain coater, and then the coating solvent is evaporated to form the self-adhesive layer. However, this method did not allow the adhesive layer to be made thick, did not provide sufficient adhesion to the target surface at the application site, left organic solvent (coating solvent) behind, took time to completely evaporate the coating solvent, and required a complicated manufacturing process and high manufacturing costs. [Prior art documents] [Patent documents]

[0015] [Patent Document 1] Japanese Patent Application Publication No. 06-115008 [Patent Document 2] Japanese Patent Application Publication No. 09-295376 [Patent Document 3] Japanese Patent Application Publication No. 11-042737 [Patent Document 4] Japanese Patent Application Laid-Open No. 2004-216722 [Patent Document 5] Japanese Patent Application Laid-Open No. 2010-089506 [Patent Document 6] Japanese Patent Application Laid-Open No. 2013-022953 [Patent Document 7] Japanese Patent Application Publication No. 2018-089788 Summary of the Invention [Problem to be solved by the invention]

[0016] The present invention has been made in view of the above-mentioned background art, and its object is to provide a natural wood decorative board with an adhesive layer that makes use of natural materials and can be easily and uniformly installed even by unskilled workers, and an installation method using the same. [Means for solving the problem]

[0017] The inventors have conducted extensive research to resolve the above-mentioned problems and solve the above-mentioned issues, and as a result have discovered that by previously applying an adhesive layer of a specific composition to the base material side of the reinforced veneer using a specific method, the variation in the applied surface between decorative panels can be significantly improved, there is no increase in costs when including the application costs at the application site, and furthermore, even an unskilled worker can easily apply the natural wood decorative panel uniformly because the adhesive layer has extremely high adhesion, which has led to the completion of the present invention.

[0018] That is, the present invention is an installation method in which a "non-carrier double-sided adhesive sheet having an adhesive layer protected by a release sheet" is adhered in advance outside the installation site to the substrate side of a "reinforced veneer having, in order, a veneer made by slicing natural wood, an adhesive layer for adhering the veneer to a substrate, and a substrate," to produce a "natural wood veneer with an adhesive layer having the reinforced veneer and the adhesive layer" protected by a release sheet, and the release sheet is peeled off at the installation site, and the natural wood veneer with an adhesive layer from which the release sheet has been peeled is sequentially attached to a target surface, the adhesive layer contains a (meth)acrylic acid ester group A and a (meth)acrylic acid ester copolymer and has a thickness of 10 μm or more and 500 μm or less; The present invention provides a construction method using a natural wood veneer with an adhesive layer, characterized in that a primer is applied in advance to a target surface having a large area equivalent to two or more rectangles arranged side by side, each having a short side length of 1 shaku (30 cm) to 10 shaku (303 cm), and then a natural wood veneer with an adhesive layer is attached on top of the primer.

[0019] The present invention also provides a construction method using the natural wood decorative board with an adhesive layer, wherein the (meth)acrylic acid ester group A and / or "the (meth)acrylic acid ester group B constituting the (meth)acrylic acid ester copolymer" contain a non-polar group-containing (meth)acrylic acid ester and a "polar group-containing (meth)acrylic acid ester and / or a polyfunctional (meth)acrylic acid ester."

[0020] Furthermore, the present invention is directed to a (meth)acrylic acid ester copolymer in which the (meth)acrylic acid ester group A and the (meth)acrylic acid ester group B are substantially the same, and the (meth)acrylic acid ester copolymer is obtained by photopolymerizing a part of the (meth)acrylic acid ester group, The adhesive layer is formed by sandwiching "an adhesive layer-forming composition containing at least the (meth)acrylic acid ester group A and a photopolymerization initiator" between the release sheet and the support sheet, and irradiating the composition with light to photopolymerize a portion of the (meth)acrylic acid ester group.

[0021] The present invention also provides an installation method using the natural wood veneer with an adhesive layer, wherein the total gel fraction of the "(meth)acrylic acid ester group A and (meth)acrylic acid ester copolymer" contained in the adhesive layer is 30% by mass or more and 80% by mass or less.

[0022] The present invention also provides a construction method using the natural wood decorative board with an adhesive layer, wherein the natural wood decorative board with an adhesive layer has an overall thickness of 150 μm or more and 2000 μm or less.

[0023] The present invention also provides a construction method using the natural wood decorative board with an adhesive layer, wherein the natural wood decorative board with an adhesive layer does not use either phenol resin or vinyl chloride resin.

[0024] The present invention also provides a method for installing the natural wood veneer with an adhesive layer, wherein the target surface is an interior wall, an exterior wall, a ceiling, a door, built-in furniture, a screen, or furniture.

[0025] The present invention also provides a construction method using the natural wood veneer with an adhesive layer, in which the "natural wood veneer with an adhesive layer" is attached to a "vertically positioned target surface or a downwardly positioned target surface" without applying adhesive to either the target surface or the substrate at the construction site.

[0026] The present invention also provides a natural wood decorative board with an adhesive layer protected by a release sheet for use in the construction method using the natural wood decorative board with an adhesive layer, comprising: The present invention provides a natural wood veneer with an adhesive layer, in which the adhesive layer is protected by a release sheet, characterized in that the natural wood veneer is made up of "a veneer made by slicing natural wood, an adhesive layer for adhering the veneer to a substrate, and a reinforced veneer having a substrate," to which "a non-carrier double-sided adhesive sheet having an adhesive layer and a release sheet" is adhered to the substrate side of the reinforced veneer.

[0027] The present invention also provides a natural wood decorative board with an adhesive layer protected by a release sheet, The present invention provides a natural wood veneer with an adhesive layer, in which the adhesive layer is protected by a release sheet, characterized in that the natural wood veneer is made up of "a veneer made by slicing natural wood, an adhesive layer for adhering the veneer to a substrate, and a reinforced veneer having a substrate," to which "a non-carrier double-sided adhesive sheet having an adhesive layer and a release sheet" is adhered to the substrate side of the reinforced veneer. [Effects of the Invention]

[0028] By using the natural wood veneer with adhesive layer of the present invention, the above problems and issues can be solved, and the veneer has a "veneer having an actual natural pattern (wood grain, etc.)" made by slicing natural wood, and the luxurious veneer that takes advantage of the good performance of natural materials and the excellent appearance and feel can be easily installed by anyone, even without skilled workers, at the installation site without placing any burden on the workers. Compared to "printed resin sheets such as vinyl chloride resin," the natural wood decorative board with adhesive layer of the present invention has an excellent appearance and feel that utilizes the real grain of natural wood, and therefore has a luxurious feel that makes use of natural materials.

[0029] In the field of "resin sheets such as vinyl chloride resin" and "conventional natural wood decorative boards," decorative boards to which an adhesive layer has been previously applied are known. However, when applying veneer or veneer-coated decorative boards made from sliced ​​natural wood to a target surface, the veneer is expensive, so adhesive is applied by hand on-site to maintain a luxurious feel; because demand for veneer-coated decorative boards is significantly lower than for decorative boards made from "resin sheets such as polyvinyl chloride resin," and because the number of lots used per pattern (wood grain, etc.) is small, mass-producing "decorative boards with a pre-applied adhesive layer on the bottom layer" in a factory or the like would increase the cost of the decorative board; adhesives with suitable adhesive properties, film thicknesses, and application methods have not yet been developed; in particular, a suitable application method for flat (reinforced) veneer has not yet been developed; it is more profitable for veneer-coated decorative boards to be handled in small lots by a few companies, rather than being widely popularized; "veneer" and "reinforced veneer made by attaching veneer to a base material" are more rigid than resin sheets and therefore have poorer adhesion to the target surface; and for these reasons, workers at the construction site manually apply adhesive to each sheet and attach it to the target surface.

[0030] Typically, decorative panels that use veneer with a high flexural modulus cannot be supplied in rolls, and are supplied in sheets for ease of work, and are often rectangular in shape with one side longer than the other. Therefore, when applying adhesive such as starch paste to attach a decorative panel to a target surface at a construction site, in order to achieve sufficient adhesion, the adhesive must be applied to both the back surface and the target surface of each decorative panel, which places a burden on the worker and significantly increases the work time.

[0031] Furthermore, whether the adhesive (pressure-sensitive adhesive) is a solvent-based or organic-based adhesive, such as a so-called "quick-drying bond," or a water-based adhesive, such as a so-called "water-based bond," in which the medium is water and the solute is emulsion-polymerized microparticles, the adhesive must be applied to each decorative panel and then to the target surface, and then left for a certain period of time (for example, about 15 to 20 minutes) before the decorative panel is applied to the target surface (it must be applied), so the leaving time can vary in length. As a result, the adhesive strength of the applied adhesive layer varies, and after several years of application, some rectangular decorative panels have experienced problems such as curling of the edges and falling off.

[0032] For example, if the adhesive described above is applied to multiple decorative panels and a large surface area at once to ensure sufficient time and improve workability, and then the decorative panels are attached one by one to the surface, the adhesive strength of some of the decorative panels will decrease depending on the length of time they are left on.As a result, problems such as the edges of some of the decorative panels curling up or peeling off over time after completion have occurred. Furthermore, in adhesives, organic solvents remain in quick-drying glues, and water remains in water-based glues and starch pastes even after the product is completed. Over time, these organic solvents and water can penetrate the veneer and seep out onto the surface, damaging its appearance.

[0033] According to the present invention, the adhesive layer is applied to the decorative sheet in advance, and is applied to the target surface while the release sheet is being peeled off, so there is no need to worry about the length of time the adhesive layer (adhesive layer) is left standing. In the present invention, the specific adhesive layer is applied by a specific method, so that the adhesiveness (adhesion) of the surface of the adhesive layer does not decrease even if the time is long, and therefore, it is impossible for some decorative sheets to curl up or fall off.

[0034] Currently, starch paste is widely used as an adhesive for application to target surfaces in order to prevent allergic reactions caused by formaldehyde, etc. However, with this starch paste, the adhesive is usually applied in a batch manner in order to prioritize workability on site and to save construction time.

[0035] However, this results in a difference in adhesive strength between the material to which the adhesive is applied initially and the material to which the adhesive is applied later, resulting in a problem due to the adhesive strength of the material that was applied earlier decreasing. Specific examples of such problems include variations in the "degree of adhesion to the target surface" between the decorative panels after installation; and peeling of some of the decorative panels from the target surface over the course of many years.

[0036] However, in the present invention, adhesive is not applied to the natural wood veneer at the work site; instead, an adhesive layer is formed in advance at a manufacturing factory, etc., and at the construction site, each sheet can be immediately attached to the target surface by simply peeling off the release sheet. Therefore, finished products such as wall surfaces to which the natural wood decorative board of the present invention is applied are less likely to peel off even after many years (even over time), and there is no variation between the natural wood decorative boards.

[0037] Furthermore, according to the present invention, an adhesive of a specific composition is applied using a specific method (non-carrier double-sided adhesive sheet method), so that a thick "adhesive layer whose adhesiveness does not decrease during installation" is applied to the natural wood veneer, and the above-mentioned problems cannot occur. Specifically, if the product is exposed to oxygen in the air after the release sheet is peeled off, the polymerization reaction of the radical polymerization monomer will not proceed, and the remaining (meth)acrylic acid ester monomer will not easily evaporate (volatilize). Furthermore, unlike the application solvents "organic solvents and water," it will not easily penetrate the veneer over time and will not seep onto the surface of the veneer, damaging its appearance.

[0038] As mentioned above, the adhesiveness of starch paste decreases with the evaporation of water, and the adhesiveness of solvent-based adhesives other than starch paste and emulsion-based adhesives also decreases with the evaporation of the coating solvent, etc., and the adhesiveness of curing-type adhesives also decreases with curing.

[0039] According to the present invention, the adhesive layer is applied to the decorative sheet in advance without a solvent, and is applied to the target surface while the release sheet is being peeled off, so there is no need to worry about the length of time the adhesive layer (adhesive layer) is left standing. Moreover, according to the present invention, the adhesiveness remains constant regardless of the pros and cons. That is, as described above, by applying an adhesive layer made of a specific material (raw material) in a specific manner, the adhesiveness (adhesion) of the surface of the adhesive layer does not decrease no matter how long it is left standing. Therefore, it is impossible for some decorative panels to experience edge curling or peeling.

[0040] Specifically, even if time passes between peeling off the release sheet and applying it to the target surface under sunlight containing visible light and ultraviolet light, the adhesive layer does not lose its adhesiveness because the radicals generated from the photopolymerization initiator and present at the end of the (meth)acrylic ester are captured (quenched) by oxygen in the air, preventing radical polymerization of the (meth)acrylic group in the adhesive layer.

[0041] According to the specific adhesive layer application method of the present invention, the thickness of the adhesive layer can be increased, so as long as the thickness is within a suitable range, the adhesive layer does not have poor adhesion. Rather, since there is no unevenness in the adhesion of each decorative sheet, there is no problem with peeling of (some) decorative sheets over time. When installing decorative boards, if even a portion (one board) peels off, curls up, or seeps out of the coating solvent (such as water) over time, the entire installation becomes a liability issue. When the natural wood decorative board with an adhesive layer of the present invention is attached to a target surface, there is absolutely no variation in the adhesiveness of each individual board to the target surface, so when all of these factors are considered together, it is extremely excellent in terms of both stability over time and cost-effectiveness.

[0042] The following specific figures are only an outline and an example, and the scope of the present invention is not limited thereto. Specifically, for example, the cost of the decorative board is about 1.5 to 2 times more expensive in the case of "using a veneer with a pre-applied adhesive layer" than in the case of "a case in which the veneer is supplied simply attached to a base material, and the decorative board is attached by workers on-site by applying adhesive," but the area of ​​the target surface that can be worked on in a day is about 2.5 to 3.5 times larger, so the construction cost (labor cost) for workers is about 1.5 to 2 times more expensive in the case of "a case in which the veneer is supplied simply attached to a base material, and the workers apply adhesive on-site to attach the decorative board." 2The cost will be about 0.7 to 0.8 times higher per unit, and the total cost will actually decrease.

[0043] In the present invention, the adhesive layer is applied in a factory or the like using a "non-carrier double-sided adhesive sheet having an adhesive layer protected by a release sheet." This allows for a stronger and thicker adhesive layer to be applied than when "adhesive layer application" is performed using other coaters such as a curtain coater, roll coater, or screen printer, and therefore makes it possible (even by inexperienced workers) to firmly attach a specific rectangular natural wood decorative panel to the target surface without variation at the construction site. Therefore, even after many years of use, peeling of the decorative board is even less likely to occur, there is no variation between natural wood decorative boards, and because it is solvent-free, there is no seepage or staining of the veneer surface.

[0044] Furthermore, the adhesive layer-attached natural wood decorative board of the present invention does not have the odor peculiar to synthetic resins, and does not use phenolic resin containing formaldehyde, vinyl chloride resin, or aromatic ring-containing solvents such as toluene, so there is no risk of volatile gases or concern about various allergies. Furthermore, since the decorative panels do not use general-purpose vinyl chloride resin, no harmful substances are produced when they are incinerated for disposal.

[0045] Furthermore, since there is no need to use adhesives at the construction site, there are no problems with workers or the surrounding environment caused by organic solvents contained in the adhesives. Furthermore, since no coating solvent is used to apply the adhesive layer even outside the construction site, such as a manufacturing factory for the adhesive-layered natural wood decorative board, there is no room for the adhesive-layered natural wood decorative board of the present invention to contain a coating solvent.

[0046] Even when natural wood veneer boards with adhesive layers are manufactured outside of a construction site such as a factory, conventionally, a coating liquid (adhesive layer forming liquid) containing dissolved adhesive layer components is applied using a roll coater or curtain coater, and then the organic solvent (coating solvent) is distilled off to form a self-adhesive layer. However, this method had the following drawbacks: the adhesive layer could not be made thick, it did not adhere well to the target surface at the application site, it was not stable over time, organic solvents (coating solvents) remained, they could bleed onto the veneer surface, and the manufacturing process was complicated and expensive.

[0047] That is, in the present invention, the adhesive layer is applied using a non-carrier double-sided adhesive sheet, so that it is not necessary to use an organic coating solvent not only at the application site but also outside the application site (such as a decorative panel manufacturing factory). Therefore, no problems arise for workers or the surrounding environment due to the solvent, and the above-mentioned problems do not occur.

[0048] According to the present invention, even non-experts can carry out the work, there is no need to worry about the time it takes to attach the film (the time it is left standing after the adhesive is applied), and the cost of installation at the construction site can be significantly reduced compared to conventional methods. Furthermore, even after many years have passed since application, the "traditional problems" of "one or several layers that were not properly attached peeling off from the target surface" do not occur, and the entire target surface remains uniform, providing excellent stability over time. [Brief explanation of the drawings]

[0049] [Figure 1] 1 is a schematic cross-sectional view showing the configuration of layers essential to the "natural wood decorative board with an adhesive layer protected by a release sheet" used in the installation method of the present invention. [Figure 2] 1 is a schematic flow diagram showing the steps of producing a "natural wood decorative board with an adhesive layer protected by a release sheet" of the present invention using a non-carrier double-sided adhesive sheet, i.e., a schematic flow diagram showing the steps of applying the adhesive layer of the natural wood decorative board with an adhesive layer of the present invention using a non-carrier double-sided adhesive sheet. [Figure 3] 1 is a schematic cross-sectional view of a natural wood decorative board with an adhesive layer after it has been attached to an object by the "construction method using a natural wood decorative board with an adhesive layer" of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0050] The present invention will be described below, but the present invention is not limited to the following specific embodiments and can be modified as desired within the scope of the technical concept.

[0051] [Natural wood decorative board with adhesive layer used in the construction method of the present invention (decorative board of the present invention)] The natural wood veneer board 1 with an adhesive layer used in the "construction method using a natural wood veneer board with an adhesive layer" of the present invention comprises "a veneer board 3 made by slicing natural wood, an adhesive layer 4 for adhering the veneer board 3 to a base material 5, and a reinforcing veneer board 2 having the base material 5," and further comprises an adhesive layer 6 formed on the base material 5 side of the reinforcing veneer board 2 outside the construction site using "a non-carrier double-sided adhesive sheet 9 having an adhesive layer 6 protected by a release sheet 7" (see Figure 1). The adhesive layer 6 that adheres to the target surface is obtained by applying a non-carrier double-sided adhesive sheet 9 in advance outside the construction site, such as a manufacturing factory, and the natural wood veneer board 1 with the adhesive layer is protected by a release sheet 7 (see Figure 1).

[0052] In other words, the natural wood decorative board 1 with an adhesive layer used in the application method of the present invention comprises a veneer 3 made by slicing natural wood, an adhesive layer 4 that adheres the veneer 3 to a base material 5, the base material 5, and an "adhesive layer 6 containing (meth)acrylic acid ester group A and a (meth)acrylic acid ester copolymer," all laminated in this order, as shown in the schematic cross-sectional view of Figure 1. The veneer 3 adhered to the base material 5 with the adhesive layer 4 constitutes the reinforced veneer 2.

[0053] The adhesive layer 6 of the adhesive-layered natural wood veneer board 1 is protected by a release sheet 7 that was present when the non-carrier double-sided adhesive sheet 9 was applied to the substrate side of the reinforcing veneer 2 (see Figures 1 and 2). Hereinafter, the "natural wood decorative board with an adhesive layer used in the installation method of the present invention" may be abbreviated simply as the "decorative board of the present invention." Since the adhesive layer 6 of the "decorative board 1 of the present invention" is protected by a release sheet 7, the "decorative board 1 of the present invention" is protected by the release sheet 7 (see Figure 1).

[0054] <Reinforced veneer> The decorative board 1 of the present invention has a reinforced veneer 2 and an adhesive layer 6, and the reinforced veneer 2 has a veneer 3, an adhesive layer 4 that adheres the veneer 3 to a substrate 5, and the substrate 5, in this order.

[0055] <<Veneer>> The term "veneer" refers to a board material made by thinly slicing natural wood. Those having beautiful wood grains are preferred as the decorative board 1 of the present invention. The veneer 3 can be produced by a known method, and is obtained by heating it in the presence of water or steam, if necessary, and then cutting it with a slicer or the like. Furthermore, the surface of the sliced ​​veneer 3 can be thinned or polished by using a file or the like to reveal the fine irregularities and woody texture of natural wood. The surface can also be protected with a resin or the like.

[0056] The raw wood for the veneer 3 is not particularly limited, but examples include zelkova, oak, ash, cherry, paulownia, cypress, cedar, pine, mahogany, walnut, oak, teak, bamboo, maple, eucalyptus, pine, rosewood, horse chestnut, beech, Japanese oak, Japanese elm, birch, sapele, wenge, zebrawood, rosewood, and ebony.

[0057] The thickness of the veneer 3 is preferably 0.08 mm to 2 mm, more preferably 0.1 mm to 1 mm, and particularly preferably 0.12 mm to 0.5 mm. If it is too thick, the adhesive layer 4 between the veneer 3 and the substrate 5, or the pressure-sensitive adhesive layer 6 between the substrate 5 and the target surface, may peel easily, resulting in the expensive veneer 3 being wasted. If it is too thin, the veneer 3 may crack, be difficult to slice, or lose its luxurious feel.

[0058] <<adhesive layer>> The adhesive layer 4 that bonds the sliced ​​veneer 3 to the substrate 5 is not particularly limited, but is preferably made from a polyurethane adhesive, an epoxy resin adhesive, a polyvinyl acetate adhesive, a vinyl acetate-(meth)acrylic acid ester copolymer adhesive, etc. The adhesive may be in the form of a latex adhesive, an aqueous vinyl urethane adhesive, a thermosetting adhesive, or a two-component adhesive.

[0059] The method of bonding the veneer 3 to the base material 5 to obtain the reinforced veneer 2 is preferably carried out by applying pressure with an adhesive interposed between the veneer 3 and the base material 5. Heat and pressure bonding is particularly preferred. In the decorative board 1 of the present invention, the veneer 3, adhesive layer 4, base material 5, and pressure-sensitive adhesive layer 6 are essential, but the presence of other "other layers" is not excluded. If such "other layers" are present, it is also preferable to interpose an adhesive between them and simultaneously (thermally and press) bond all of the plate-like objects, including the veneer 3 and base material 5.

[0060] <<Base material>> Examples of the substrate 5 include paper, nonwoven fabric, woven fabric, metal foil, wooden board, resin-impregnated paper, resin film, laminate film, etc. These may contain functional agents such as fillers, dyes and pigments, flame retardants, flame retardants, preservatives, and chelating agents to enhance their functionality. In particular, paper or nonwoven fabric is preferred as the substrate 5 from the viewpoints of high strength, flexibility, ease of processing, low cost, ease of impregnation or incorporation of the above-mentioned functionality-imparting agent, high conformability, high breathability, etc., and paper is particularly preferred from the same viewpoints as above.

[0061] The thickness of the base material 5 is not particularly limited, but is preferably 1 / 20 to 1 / 2 of the thickness of the veneer 3 to be adhered thereto, more preferably 1 / 10 to 1 / 3, and particularly preferably 1 / 7 to 1 / 3.5. Specifically, the thickness is preferably 15 μm or more and 1000 μm or less, more preferably 20 μm or more and 300 μm or less, and particularly preferably 25 μm or more and 100 μm or less. When the substrate 5 is paper or nonwoven fabric, the basis weight is 10 to 100 g / m 2 is preferred, and 20 to 50 g / m 2is particularly preferred.

[0062] If the thickness or basis weight of the base material 5 is too small, the strength of the reinforcing veneer 2 or decorative board 1 may be insufficient, it may be difficult to apply (laminate) the adhesive layer 6, the veneer 3 may be affected by substances and volatile matter generated from the adhesive layer 6, and it may be difficult to manufacture or handle. On the other hand, if the thickness or basis weight of the base material 5 is too large, the adhesive layer 4 between the veneer 3 and the base material 5, or the adhesive layer 6 between the base material 5 and the target surface, may peel off, or the thickness may be wasted.

[0063] <Adhesive layer> The adhesive layer 6 is an adhesive layer provided for attaching the reinforcing veneer 2 to the object T. It is preferable that the adhesiveness does not substantially decrease over time from the time the decorative board 1 is manufactured in a factory or the like to the time it is installed (used) on site, and this is possible according to the adhesive layer composition and adhesive layer formation method described below.

[0064] As mentioned above, in the past, to improve workability and shorten work time, workers would typically first apply adhesive to multiple "decorative boards with veneer 3" and the corresponding "(large-area) target surface," then leave them to rest for a certain period of time before attaching the multiple decorative boards 1. However, this meant that the length of time that each decorative board 1 was left to rest varied, and the adhesive strength of the adhesive varied from one decorative board 1 to another (and from one location on the target surface to another), so after several years of installation, some decorative boards 1 (mostly decorative boards 1 that had adhesive applied first and were left to rest for a long time) began to experience problems such as edge curling and falling off.

[0065] In the decorative board 1 of the present invention, a specific adhesive layer 6, which will be described later, is used, and by adhering the adhesive layer 6 to the base material side of the reinforcing veneer 2 in a factory or the like using a specific method, which will be described later, workers at the construction site do not have to apply or apply the adhesive (adhesive), but can apply it to the target surface by peeling off the release sheet 7, and there is no need to worry about the length of time the adhesive layer 6 is left on. Furthermore, by using an adhesive layer 6 of a specific composition as described below, the adhesiveness (bonding properties) of the surface of the adhesive layer 6 does not decrease no matter how long it is left at the construction site, so the adhesiveness of the entire decorative sheet is uniform, and there is no risk of edge curling or falling off of some of the decorative panels 1.

[0066] <<How to apply an adhesive layer>> In the installation method of the present invention, a "non-carrier double-sided adhesive sheet 9 having an adhesive layer 6 protected by a release sheet 7" is adhered to the base material 5 side of the reinforcing veneer 2 outside the installation site prior to installation at the installation site, thereby producing a natural wood veneer board 1 with an adhesive layer protected by a release sheet 7 (see Figure 2).

[0067] The present invention also relates to a natural wood veneer board 1 with an adhesive layer 6 protected by a release sheet 7, in which a "non-carrier double-sided adhesive sheet 9 having an adhesive layer 6 and a release sheet 7" is adhered to the side of the substrate 5 of "a veneer 3 made by slicing natural wood, an adhesive layer 4 that adheres the veneer 3 to a substrate 5, and a reinforced veneer board 2 having the substrate 5, in that order" (see Figures 1 and 2). The present invention also relates to a natural wood decorative board 1 with an adhesive layer in which the adhesive layer 6 is protected by a release sheet 7, and this "decorative board protected by a release sheet 7" can be the subject of sale or transfer.

[0068] The structure and manufacturing method of the "non-carrier double-sided adhesive sheet 9 having an adhesive layer 6 protected by a release sheet 7" are as follows (see FIG. 2).

[0069] In the manufacturing process of the decorative board of the present invention (more specifically, in the preparation process of the non-carrier double-sided adhesive sheet 9 in the manufacturing process of the decorative board of the present invention), the above-mentioned adhesive layer 6 is obtained as a layer sandwiched between a support sheet 8 and a release sheet 7 (see Figures 2(a)(b)). The adhesive layer 6 contains at least a (meth)acrylic acid ester group A and a (meth)acrylic acid ester copolymer.

[0070] Of the (meth)acrylic acid ester group contained in the raw materials for forming the adhesive layer, those polymerized by photopolymerization or thermal polymerization, as described below, are "(meth)acrylic acid ester copolymers," and those that do not polymerize and remain as monomers are "(meth)acrylic acid ester group A." Therefore, if the copolymerization unit constituting the (meth)acrylic acid ester copolymer is referred to as "(meth)acrylic acid ester group B," then "the (meth)acrylic acid ester group B constituting the copolymer" and "the unpolymerized (meth)acrylic acid ester group A" have the same "adhesive layer-forming composition" before polymerization (at the starting point) (they are one set), and therefore, although it depends on the copolymerizability (Q value, e value) of each monomer in the copolymerization, the component names are approximately the same and the component ratios are similar.

[0071] The unpolymerized "(meth)acrylic acid ester group A" provides the adhesive layer 6 with suitable adhesiveness together with the tackifier compound and the like.

[0072] The adhesive layer 6 contains at least (meth)acrylic acid ester group A and a (meth)acrylic acid ester copolymer, and therefore may contain other polymerizable monomers (copolymerization components) such as styrene, (meth)acrylic acid amide, vinyl acetate, etc.; copolymers thereof; and non-polymerizable "other components," as described below.

[0073] When the adhesive layer 6 is one of the above, or more specifically, one described below, the following advantages are achieved: stable performance from production in the factory to application at the construction site; the decorative board 1 of the present invention can be easily adhered to the surface of the object T; stability over time after application is good; the storage modulus, peel adhesive strength, etc. can be easily adjusted to the desired range; the gel fraction can be easily adjusted; the glass transition temperature (Tg) can be easily adjusted; solvent-free production is possible; there are no allergy issues; and the unpolymerized (meth)acrylic acid ester group A does not bleed into the veneer and cause stains, etc.

[0074] In the construction method of the present invention, it is preferable that the adhesive layer-attached natural wood veneer board 1 is as described below and does not use phenolic resin or vinyl chloride resin, from the standpoint of safety for workers and consumers, environmental characteristics, etc.

[0075] <<Non-carrier double-sided adhesive sheet protected by a release sheet>> The adhesive layer 6 in the present invention is obtained as the adhesive layer 6 of the non-carrier double-sided adhesive sheet 9, as a layer sandwiched between a support sheet 8 and a release sheet 7 (see FIGS. 2(a) and (b)). The adhesive layer 6 is formed by partial polymerization while protected by a release sheet, and is applied (adhered) to the substrate 5 side of the reinforcing veneer 2 (see FIGS. 2(c) and 2(d)).

[0076] As shown in FIG. 2(b), the adhesive layer 6 can be obtained by irradiating an "adhesive layer-forming composition" containing a (meth)acrylic acid ester, which will be described later, with light to polymerize it. In addition to the (meth)acrylic acid ester described below, the "adhesive layer-forming composition" may, if necessary, contain at least one of the following: a "polymerizable monomer other than a (meth)acrylic acid ester" described below, a polymerization initiator such as a photoradical polymerization initiator, a tackifying compound, fine particles, and / or "other components."

[0077] The "adhesive layer-forming composition" is usually obtained by putting the above-mentioned components into a mixing vessel and mixing them. Preferably, in order to remove dissolved oxygen in the "adhesive layer-forming composition", an inert gas such as nitrogen gas is bubbled through the composition.

[0078] Thereafter, the "adhesive layer-forming composition" is applied onto a support sheet 8 or a release sheet 7, and then the other release sheet 7 or support sheet 8 (the sheet names are in the same order) is applied to the coated surface (to cover the coated surface) mainly to prevent oxygen in the air from penetrating and diffusing into the coating film (see Figure 2(a)). Next, the layer is partially polymerized by irradiating it with light or by heating it from the side of the release sheet 7 and / or the support sheet 8, to obtain an adhesive layer 6 containing at least the (meth)acrylic acid ester copolymer and unpolymerized (meth)acrylic acid ester group A (see FIG. 2(b)). FIG. 2(b) shows an example in which light is irradiated from the support sheet 8 side to photopolymerize part of the (meth)acrylic acid ester group, but light may also be irradiated from the release sheet 7 side.

[0079] Examples of light sources that can be used for light irradiation include low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, chemical lamps, xenon lamps, black light lamps, microwave-excited mercury lamps, metal halide lamps, and LEDs. The light irradiation energy varies depending on the presence or absence and type of photopolymerization initiator, the coating film thickness, the light intensity (energy irradiated per unit time), etc., but is generally in the range of 0.1 to 100 mW / cm 2 is preferred.

[0080] Next, the support sheet 8 is peeled off to expose the adhesive layer 6, thereby obtaining a "non-carrier double-sided adhesive sheet 9 protected by a release sheet 7" (see FIG. 2(c)). The release sheet 7 remains until the time of application, in other words, the part that remains until the time of application is defined as the peel-off sheet, and the part that is peeled off at this stage is the "support sheet 8".

[0081] As described above, the adhesive layer 6 of the adhesive-layered natural wood decorative board 1 of the present invention is preferably formed by sandwiching "an adhesive layer-forming composition containing at least a (meth)acrylic acid ester group and a photopolymerization initiator" between the release sheet 7 and the support sheet 8, and irradiating it with light to photopolymerize a portion of the (meth)acrylic acid ester group. When a part of the (meth)acrylic acid ester group is photopolymerized, a (meth)acrylic acid ester copolymer and unreacted (unpolymerized) (meth)acrylic acid ester group A are obtained in the adhesive layer 6.

[0082] The weight-average molecular weight of the (meth)acrylic acid ester copolymer obtained by polymerization, as determined by gel permeation chromatography (GPC), is preferably from 50,000 to 5,000,000, more preferably from 100,000 to 2,000,000, and particularly preferably from 150,000 to 1,000,000. Within this range, the adhesive strength when attaching the decorative sheet 1 to a target surface and the stability over time after adhesion (such as the absence of edge curling or peeling) can be increased and maintained.

[0083] The overall gel fraction of the "(meth)acrylic acid ester group A and (meth)acrylic acid ester copolymer" contained in the adhesive layer 6 is preferably 20% by mass or more and 90% by mass or less, more preferably 30% by mass or more and 80% by mass or less, particularly preferably 40% by mass or more and 70% by mass or less, and most preferably 45% by mass or more and 65% by mass or less.

[0084] By setting the gel fraction within the above range, it is easy to set the cohesive strength and storage modulus of the adhesive layer 6 within suitable ranges, and it is easy to increase the peel adhesive strength of the adhesive layer 6. Furthermore, by setting the gel fraction within the above range, the unpolymerized (meth)acrylic acid ester group A suitably increases the adhesiveness. The gel fraction can be adjusted to fall within the above range by, for example, adjusting the blending amount of "(1-3) polyfunctional (meth)acrylic acid ester" described below.

[0085] The "gel fraction" can be calculated by the following formula (1). Gel fraction (mass%) = (B / A) × 100 (1) A: Mass of adhesive layer B: The adhesive layer was immersed in tetrahydrofuran (THF) at 40°C for 48 hours, and the dry mass of the insoluble portion of the adhesive layer was measured after immersion.

[0086] The glass transition temperature (Tg) of the pressure-sensitive adhesive layer is preferably -40°C to 10°C, more preferably -35°C to 0°C, and particularly preferably -30°C to -10°C. When the Tg of the pressure-sensitive adhesive layer is within this temperature range, the adhesion of the double-sided pressure-sensitive adhesive tape at low temperatures is likely to be improved. The glass transition temperature is measured using a general-purpose dynamic viscoelasticity device.

[0087] <<Adhesive layer forming composition>> The adhesive layer-forming composition, which is sandwiched between the release sheet 7 and the support sheet 8 and serves as a raw material for a polymerization reaction by irradiation with light or the like, contains (1) a (meth)acrylic acid ester as an essential component, but also contains (2) Polymerizable monomers other than (meth)acrylic acid esters, (3) a polymerization initiator such as a photoradical polymerization initiator; (4) a tackifying compound; (5) fine particles; and / or (6) Other ingredients It is desirable that the compound contains preferably one kind, more preferably two kinds, even more preferably three kinds, and particularly preferably four kinds of the above.

[0088] <<<(1) (Meth)acrylic acid ester group>>> The (meth)acrylic acid ester group A and the "(meth)acrylic acid ester group B constituting the (meth)acrylic acid ester copolymer" (before polymerization, A and B together constitute the "(meth)acrylic acid ester group") are not particularly limited as long as they are polymerizable, but those that are liquid at room temperature but have low volatility are preferred. The "polymerization" is preferably radical polymerization, in which the degree of polymerization (gel fraction) does not increase over time in principle, rather than ionic polymerization, in which the degree of polymerization (gel fraction) increases over time through successive reactions. The term "(meth)acrylic acid ester group" means either acrylic acid ester or methacrylic acid ester (both).

[0089] The (meth)acrylic acid ester group preferably includes "(1-1) polar group-free (meth)acrylic acid ester" and "(1-2) polar group-containing (meth)acrylic acid ester, and / or (1-3) polyfunctional (meth)acrylic acid ester." In other words, the "(1) (meth)acrylic acid ester" is preferably "(1-1) and (1-2) and / or (1-3)."

[0090] <<<<(1-1) Non-polar group-containing (meth)acrylic acid esters>>>> (1-1) The ester of the polar group-free (meth)acrylic acid ester is not particularly limited, but alkyl esters, aryl esters, aralkyl esters, etc. having 1 to 22 carbon atoms are preferred. The number of carbon atoms in each of the three types of esters is more preferably 18 or less, even more preferably 16 or less, particularly preferably 2 to 12, and most preferably 4 to 8. It is desirable that the "(1-1) polar group-free (meth)acrylic acid ester" contains one having a group with a carbon number within the above range.

[0091] By containing those in the above range, it becomes easy to adjust the glass transition temperature of the (meth)acrylic acid ester copolymer in the adhesive layer 6 to a desired range. That is, it is preferable as the (meth)acrylic acid ester group B. Unreacted (unpolymerized) "(meth)acrylic acid ester group A" is also preferred.

[0092] Specific examples of alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, cyclohexyl (meth)acrylate, heptyl (meth)acrylate, norbornyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, stearyl (meth)acrylate, and behenyl (meth)acrylate. These may be used alone or in combination of two or more.

[0093] Among these, those having a carbon number within the above range are preferred, and specifically, for example, n-butyl(meth)acrylate, hexyl(meth)acrylate, heptyl(meth)acrylate, 2-ethylhexyl(meth)acrylate, and n-octyl(meth)acrylate are more preferred; n-butyl(meth)acrylate and 2-ethylhexyl(meth)acrylate are particularly preferred; and 2-ethylhexyl(meth)acrylate is most preferred. These may be used alone, or in combination of two or more kinds, or in combination of two or more kinds with those described above.

[0094] Specific examples of aryl esters include phenyl(meth)acrylate, tolyl(meth)acrylate, and xylyl(meth)acrylate.

[0095] Specific examples of aralkyl esters include benzyl (meth)acrylate.

[0096] (1-1) The total content of the polar group-free (meth)acrylic acid esters is preferably 20% by mass or more and 95% by mass or less, more preferably 30% by mass or more and 90% by mass or less, and particularly preferably 40% by mass or more and 85% by mass or less, based on the entire adhesive layer 6. When the content is above this range, it is possible to impart a desired adhesive strength to the adhesive layer 6.

[0097] <<<<(1-2) Polar group-containing (meth)acrylic acid esters>>>> (1-2) The polar group-containing (meth)acrylic acid ester is not particularly limited, and examples of the polar group include a dialkylamino group, an alkylarylamino group, a diarylamino group, a hydroxyl group, an alkyloyl group, a carboxyl group, an ethylene glycol residue (—CHCHO—), a propylene glycol residue, a diethylene glycol residue, a dipropylene glycol residue, a triethylene glycol residue, a tripropylene glycol residue, a furfuryl group, and a glycidyl group.

[0098] Further examples include groups in which an alkylene group is bonded to the above polar groups, such as a 2-carboxyethyl group, a hydroxyethyl group, a dialkylaminoethyl group, an alkylarylaminoethyl group, and a diarylaminoethyl group. Further examples include substances having a (meth)acryloyl group at one end, which are prepared by reacting a substance having an epoxy group at one end with (meth)acrylic acid.

[0099] Specific examples include dimethylaminoethyl (meth)acrylate, 2-carboxyethyl (meth)acrylate (β-carboxyethyl (meth)acrylate), 2-hydroxyethyl (meth)acrylate (HE(M)A)), and hydroxyethoxyethyl (meth)acrylate.

[0100] (1-2) The content of the polar group-containing (meth)acrylic acid ester, in total, is preferably 2% by mass or more and 25% by mass or less, more preferably 4% by mass or more and 20% by mass or less, and particularly preferably 6% by mass or more and 15% by mass or less, based on the entire adhesive layer 6. By including the components in the above range, it becomes easier to obtain an adhesive layer 6 that has both low-temperature adhesiveness and high-temperature adhesiveness (retention power). For example, even if the decorative board 1 is applied in winter and then summer arrives, displacement or falling off can be prevented.

[0101] <<<<(1-3) Polyfunctional (meth)acrylic acid esters>>>> (1-3) The polyfunctional (meth)acrylic acid ester is not particularly limited as long as it has two or more (meth)acrylic groups in one molecule and is capable of crosslinking. Specific examples include hexanediol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, ethoxylated bisphenol A di(meth)acrylate, tris(2-hydroxyethyl)isocyanurate tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propane diol, and the like. Examples of the acrylate copolymer include propyloxylated trimethylolpropane tri(meth)acrylate, proxilated glyceryl tri(meth)acrylate, neopentyl glycol adipate di(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolpropane di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, polybutadiene having (meth)acryloyl groups at both ends, and hydrogenated products thereof.

[0102] (1-3) The content of the polyfunctional (meth)acrylic acid ester, in total, is preferably 0.01% by mass or more and 16% by mass or less, more preferably 0.10% by mass or more and 13% by mass or less, and particularly preferably 0.2% by mass or more and 10% by mass or less, based on the entire adhesive layer 6. By including the components in the above range, it becomes easier to obtain an adhesive layer 6 that has both low-temperature adhesiveness and high-temperature adhesiveness (retention power). For example, even if the decorative board 1 is applied in winter and then summer arrives, displacement or falling off can be prevented.

[0103] The above effects can be achieved by including "(1-2) a polar group-containing (meth)acrylic acid ester and / or (1-3) a polyfunctional (meth)acrylic acid ester."

[0104] <<<(2) Polymerizable monomers other than (meth)acrylic acid esters>>> (2) Examples of polymerizable monomers other than (meth)acrylic acid esters include (meth)acrylic acid, (meth)acrylic acid amide, (meth)acrylic acid alkylamide, styrene, divinylbenzene, α-methylstyrene, o-methylstyrene, p-methylstyrene, maleic acid (anhydride), vinyl alkyl ether, vinyl acetate, allyl compounds, esters of (meth)acrylic acid and "alcohols having an amide group", esters of (meth)acrylic acid and hydroxyethylethylene urea ((meth)acrylic acid ester ethylethylene urea), (poly)butadiene, (poly)ethylene, or (poly)ethylene, or partially hydrogenated products thereof, which may or may not have a (meth)acryloyl group at one end, and the like.

[0105] (2) The total content of polymerizable monomers other than (meth)acrylic acid esters is preferably 6% by mass or less, more preferably 0.1% by mass or more and 5% by mass or less, and particularly preferably 0.2% by mass or more and 3% by mass or less, based on the total amount of the adhesive layer 6.

[0106] <<<(3) Polymerization initiators such as photoradical polymerization initiators>>> (3) The polymerization initiator, such as a photoradical polymerization initiator, is not particularly limited as long as it generates radicals (initiation) using energy such as visible light, ultraviolet light, an electron beam, or heat, and radically polymerizes the double bond of the (meth)acrylic acid ester (propagation). A photoradical polymerization initiator is preferred, and a visible light or ultraviolet light radical polymerization initiator is more preferred, since it allows the polymerization initiation time to be clearly determined. Further, the polymerization may be initiated in the presence of a spectral sensitizer.

[0107] Specific examples include benzoin compounds, benzil ketal compounds, α-hydroxyacetophenone compounds, α-aminoacetophenone compounds, acylphosphine oxide compounds, benzophenone, Michler's ketone, thioxanthone, trichloromethyl-s-triazine, tribromomethyl-s-triazine, chlorobutane, bromobutane, biimidazole compounds, peroxides, and AIBN.

[0108] <<<(4) Tackifying compound>>> There are no particular limitations on the tackifying compound, as long as it is a compound that imparts tackiness when contained in the adhesive layer 6. There are no particular limitations on the molecular weight of the tackifying compound, but it is preferable that the tackifying compound be a tackifying resin rather than a tackifying monomer.

[0109] In the case of a tackifying resin, although there are no limitations, the weight average molecular weight is preferably 500 or more and 40,000 or less, more preferably 1,000 or more and 20,000 or less, and particularly preferably 1,500 or more and 10,000 or less. The softening point of the tackifier resin is preferably 90° C. or higher, more preferably 95° C. or higher and 150° C. or lower, and particularly preferably 100° C. or higher and 140° C. or lower, from the viewpoint of improving adhesive strength. It is also preferable to use resins with different softening points in combination. The softening point is measured by the ring and ball method specified in JIS K2207 and is defined as the value measured in this manner.

[0110] Specific examples include polyurethanes including urethane oligomers; epoxy resins including epoxy oligomers; polyesters including low-molecular-weight polyesters; rosin-based resins such as hydrogenated rosin, rosin ester, and disproportionated rosin; terpene-based resins such as hydrogenated terpenes and terpenes; petroleum-based resins such as hydrogenated petroleum resins and petroleum resins; and xylene-based resins such as hydrogenated xylene resins and xylene resins.

[0111] The tackifying compound is preferably one having a small chain transfer coefficient so as not to inhibit radical polymerization, and is more preferably a hydrogenated compound.

[0112] When a tackifying compound is contained, the content of the tackifying compound per 100 parts by mass of the adhesive layer is preferably 2 to 40 parts by mass, more preferably 4 to 35 parts by mass, particularly preferably 6 to 30 parts by mass, and most preferably 7 to 25 parts by mass.

[0113] <<<(5) Fine particles>>> The adhesive layer 6 may contain fine particles. By including the fine particles, the adhesiveness and cohesive force of the adhesive layer 6 can be improved.

[0114] Specific examples of the fine particles include inorganic hollow particles such as glass balloons, shirasu balloons, and fly ash balloons; organic hollow particles such as poly(meth)acrylic acid alkyl esters, acrylonitrile-vinylidene chloride copolymers, polystyrene, and phenolic resins; inorganic fine particles such as glass, silica, alumina, mica, talc, silicates, barium sulfate, and calcium carbonate; and organic fine particles such as poly(meth)acrylic acid alkyl esters, polyurethane, polyethylene, and polypropylene.

[0115] When the fine particles are contained, the content of the fine particles relative to 100 parts by mass of the adhesive layer is preferably 0.1 to 15 parts by mass, more preferably 0.2 to 10 parts by mass, and particularly preferably 0.5 to 5 parts by mass.

[0116] <<<(6) "Other Ingredients">>> The adhesive layer 6 may contain (6) "other components." Examples of the "other components" include plasticizers, lubricants, flame retardants, flame retardants, softeners, color pigments, dyes, and preservatives.

[0117] <<Adhesive layer thickness>> The thickness of the adhesive layer 6 is not particularly limited, but is preferably 10 μm or more and 500 μm or less, more preferably 15 μm or more and 400 μm or less, even more preferably 20 μm or more and 300 μm or less, particularly preferably 25 μm or more and 200 μm or less, and most preferably 30 μm or more and 100 μm or less.

[0118] If the thickness of the adhesive layer 6 is too thin, it may be difficult to manufacture the decorative panel 1, peeling may occur easily between the substrate 5 and the target surface, peeling may occur easily over time, or initial adhesion may be poor. On the other hand, if the adhesive layer 6 is too thick, separation (dissociation) may occur easily within the adhesive layer 6, causing the decorative sheet 1 to peel off between the substrate 5 and the target surface, or the adhesive layer 6 may deteriorate or become wasted.

[0119] The "method for forming a release layer" of the present invention, i.e., a method in which a "non-carrier double-sided adhesive sheet 9 having an adhesive layer 6 protected by a release sheet 7" is pre-adhered outside the construction site and an adhesive layer 6 is formed on a decorative board 1 protected by a release sheet 7, can achieve the effects described above and below, but in particular can stably form the above-mentioned thick adhesive layer 6 that is suitable (matched) for the construction method of the present invention. A thick adhesive layer 6 cannot be stably prepared using a curtain coater, roll coater, screen printer, spray coater, or the like.

[0120] <Release sheet, support sheet> The above-mentioned "adhesive layer raw material" is applied onto a support sheet 8 or a release sheet 7, and then the other release sheet 7 or support sheet 8 is applied to the applied surface. The "adhesive layer raw material" is preferably exposed to light (irradiated with light) over its entire surface, thereby partially polymerizing the material and completing the adhesive layer 6 (Figures 2(a)(b)). The support sheet 8 is then peeled off to obtain a "non-carrier double-sided adhesive sheet 9 having an adhesive layer 6 protected by a release sheet 7" (Figure 2(c)), which is then adhered to the substrate side of the reinforcing veneer 2 to produce a natural wood veneer board 1 with an adhesive layer (Figure 2(d)). The "non-carrier double-sided adhesive sheet 9" in the present invention is also called a "non-support tape" or a "double-sided adhesive tape."

[0121] The materials for the release sheet 7 and the support sheet 8 are not particularly limited and may be any of resin (polymer), woven fabric, nonwoven fabric, paper, metal, etc. However, when the adhesive layer 6 is produced by exposure (light irradiation), it is preferable that the material of the sheet on the side where light is irradiated is colorless and transparent to prevent light absorption. Furthermore, when radical polymerization is carried out, a material with gas barrier properties is preferred to prevent oxygen in the air from penetrating and diffusing into the "adhesive layer raw material."

[0122] In particular, in the case of resins (polymers), specific examples include polyester, polyolefin, polyvinyl chloride, polyvinyl acetate, and the like.

[0123] It is preferable that the sides of the release sheet 7 and the support sheet 8 that come into contact with the "adhesive layer raw material" (the coated surface, the surface that comes into contact with the adhesive layer 6) are subjected to a release treatment to improve peelability from the adhesive layer 6.

[0124] [Installation method using the adhesive-coated natural wood decorative panel of the present invention] <Size, shape, etc. of the natural wood decorative board with adhesive layer (decorative board of the present invention)> The shape and size of the decorative board 1 in the present invention is preferably in the form of a sheet rather than a roll, and is preferably a rectangle with at least one side measuring 1 shaku (30 cm) to 10 shaku (303 cm). In the construction method of the present invention, the decorative panel 1 is attached to a target surface having a large area equivalent to two or more rectangles with short sides each having a length of between 1 shaku (30 cm) and 10 shaku (303 cm).To achieve this, it is preferable that the decorative panel 1 has a size within the above-mentioned range, and it is particularly preferable that both sides are between 1 shaku (30 cm) and 10 shaku (303 cm). Within this range, it can be suitably applied to (attached to) a target surface having a large area, cracks are less likely to occur in the sliced ​​veneer 3, and workability on site is improved.

[0125] The decorative board 1 of the present invention has an overall thickness, excluding the release sheet 7, of preferably 150 μm or more and 2000 μm or less, more preferably 200 μm or more and 1500 μm or less, even more preferably 300 μm or more and 1000 μm or less, and particularly preferably 400 μm or more and 700 μm or less.

[0126] If the thickness of the decorative board 1 is too thin, the same problems as those that occur when the thickness of the veneer 3 or each layer is too thin can easily occur, and in particular, the adhesiveness to the target surface and the adhesive stability over time can be reduced. According to the "method for adhering (applying) the adhesive layer 6 to the reinforcing veneer 2" of the present invention, the thick adhesive layer 6 as described above can be suitably formed. On the other hand, if it is too thick, the same problems as those that occur when the sliced ​​veneer 3 or each layer is too thick may occur.

[0127] <Construction method, construction location, target surface, etc.> In the installation method of the present invention, a non-carrier double-sided adhesive sheet 9 is adhered to a reinforcing veneer 2 outside the installation site in advance to produce a "decorative board 1 protected by a release sheet 7." At the installation site, the release sheet 7 is peeled off, and the decorative boards 1 from which the release sheet 7 has been peeled off are then sequentially attached to the target surface of the object T. Unlike conventional methods, there is no need to apply adhesive to the decorative board 1 or the target surface at the construction site, and there is no need to worry about the time from applying the adhesive to pasting. A large decorative panel 1 may be cut on-site to fit the size of the target surface. Also, a primer is applied in advance to the target surface of the target object T. Any known primer can be used.

[0128] There are no particular limitations on the object T (building, etc.) to which the tape is to be attached, but examples include interior walls, exterior walls, ceilings, doors, built-in furniture, screens (partitions), or furniture in halls, elevators, rooms, corridors, spaces, etc. of public halls, art museums, music / lecture / sports venues, community centers, commercial buildings, residential buildings, etc. It is particularly preferable to attach it to these approximately vertical surfaces, as this allows the grain of the natural wood to be clearly visible and causes less impact than a floor.

[0129] In particular, it is preferable to apply it to large target surfaces such as interior walls, exterior walls, and ceilings, as this makes it easier to achieve the effects of the present invention, such as the aforementioned "there is no need to apply adhesive to either the decorative panel 1 or the target surface at the construction site" and "there is no need to worry about the time between applying the adhesive at the construction site and pasting it on." Specifically, it is preferable to provide a large area with two or more, preferably three or more, more preferably five or more, even more preferably ten or more, and particularly preferably fifteen or more rectangles, each with a side length between 3 shaku (91 cm) and 10 shaku (303 cm), lined up vertically or horizontally, as this makes it particularly easy to achieve the effects of the invention.

[0130] The present invention is also a construction method using a decorative board in which the "natural wood decorative board 1 with adhesive layer" is attached to a "vertically located target surface (see Figure 3) or a target surface that is located downward" without applying adhesive to either the target surface or the base material 5 at the construction site. According to the installation method of the present invention using the decorative board described above, the adhesive has strong adhesion, stability over time, and there is no difference (or can be no difference) in adhesiveness between each decorative board 1, so it is effective even on "target surfaces that face downward," such as ceilings.

[0131] <Natural wood veneer with adhesive layer protected by release sheet> The present invention relates to the natural wood decorative board 1 with an adhesive layer described above, and more preferably to the natural wood decorative board 1 with an adhesive layer used in the installation method of the present invention. That is, the present invention provides a natural wood decorative board 1 with an adhesive layer protected by a release sheet 7 for use in the above-mentioned "construction method using a natural wood decorative board with an adhesive layer," It is also a natural wood veneer board 1 with an adhesive layer, in which the adhesive layer 6 is protected by a release sheet 7, characterized in that it is composed of "a veneer 3 made by slicing natural wood, an adhesive layer 4 that adheres the veneer 3 to a base material 5, and a reinforced veneer board 2 having the base material 5," to which "a non-carrier double-sided adhesive sheet 9 having an adhesive layer 6 and a release sheet 7" is adhered to the side of the base material 5. [Example]

[0132] The present invention will be explained in more detail below by way of examples and comparative examples, but the present invention is not limited to these examples as long as it does not depart from the gist of the invention.

[0133] Manufacturing Example 1 <Manufacturing reinforced veneer> A "30 μm thick, brown-colored backing paper" was used as the substrate 5, and a veneer 3 made of natural zelkova wood sliced ​​to a thickness of 350 μm (0.35 mm) was glued to its surface to obtain a reinforced veneer 2 (see Figure 1). Its size was a rectangle measuring 1 shaku (30 cm) by 3 shaku (91 cm).

[0134] Manufacturing Example 2 <Production of "non-carrier double-sided PSA sheet with adhesive layer" protected by a release sheet - 1> The adhesive layer raw material composition was prepared not at the construction site but in the manufacturing plant by compounding and mixing the adhesive layer raw materials described below.

[0135] Classification Raw material name Mixing ratio 1-1 2-Ethylhexyl acrylate 65 parts by mass 1-1 n-Butyl acrylate 10.0 parts by mass 1-3 Trimethylolpropane triacrylate 1.00 parts by mass 2. Acrylic acid 5.0 parts by mass 2. Hydrogenated polybutadiene having a methacryloyl group at one end 5.0 parts by mass 4. Hydrogenated petroleum resin (softening point 100℃ and 140℃) 12.0 parts by mass 5. Glass powder 0.50 parts by mass 3. Michler's ketone 0.50 parts by mass

[0136] A spacer having a thickness of 0.3 mm (300 μm) was placed on the release-treated surface of the support sheet 8, and the adhesive layer raw material composition was applied to a thickness of 300 μm. Next, a release sheet 7 was placed on the coating film so that the release-treated surface was in contact with the coating film (FIG. 2(a)). The support sheet 8 and the release sheet 7 were made of a silicone release-treated PET film (thickness: 50 μm).

[0137] In this state, the irradiation intensity from the release sheet 7 side was 5 mW / cm 2 Then, ultraviolet and visible light were irradiated from a chemical lamp for 15 minutes (see Figure 2(b) (except that the irradiated side was reversed)), and an "adhesive layer 6 (i.e., non-carrier double-sided adhesive sheet 9)" sandwiched between a support sheet 8 and a release sheet 7 was obtained (Figure 2(b)).

[0138] The resulting adhesive layer 6 had a gel fraction of 45 mass % and a glass transition temperature (Tg) of -20°C.

[0139] Manufacturing Example 3 <Manufacturing natural wood veneer with adhesive layer protected by release sheet - 1> Next, the support sheet 8 was peeled off from the product obtained in the above-mentioned Manufacturing Example 2, and adhered (bonded) to the base material 5 side of the reinforced veneer 2 obtained in Manufacturing Example 1, thereby obtaining a natural wood veneer board 1 with an adhesive layer protected by a release sheet 7 (Figure 1, Figure 2(d)). The product thus obtained is designated "Decorative Panel A."

[0140] Production Example 4 <Production of "non-carrier double-sided PSA sheet with adhesive layer" protected by a release sheet - 2> An adhesive layer raw material composition was prepared in the same manner as in Production Example 2, except that the adhesive layer raw material was changed to the composition shown below.

[0141] Classification Raw material name Mixing ratio 1-1 2-Ethylhexyl acrylate 100 parts by mass 1-2 β-carboxyethyl acrylate 7.0 parts by mass 1-3 Pentaerythritol triacrylate 2.00 parts by mass 2. Hydrogenated polybutadiene having an acryloyl group at one end 10.0 parts by mass 2. Acrylamide 1.00 parts by mass 4. Hydrogenated petroleum resin (softening point 100°C and 140°C) 10.0 parts by mass 5. Glass powder 1.00 parts by mass 3. 2,2-Dimethoxy-2-phenylacetophenone 0.50 parts by mass

[0142] In this state, the coating film surface was covered with a release sheet 7 applied in the same manner as in Production Example 2 (FIG. 2). Irradiation intensity 2mW / cm 2 The laminate was irradiated with ultraviolet and visible light for 5 minutes using a chemical lamp (see Figure 2(b)), to obtain an "adhesive layer 6 (i.e., non-carrier double-sided adhesive sheet 9)" sandwiched between a support sheet 8 and a release sheet 7 (Figure 2(b)).

[0143] The resulting adhesive layer 6 had a gel fraction of 55% by mass and a glass transition temperature (Tg) of -30°C.

[0144] Production Example 5 <Manufacturing natural wood veneer with adhesive layer protected by release sheet - 2> The support sheet 8 was peeled off from the product obtained in the above-mentioned Manufacturing Example 4, and the reinforced veneer 2 obtained in Manufacturing Example 1 was adhered to the base material 5 side to obtain a natural wood veneer board 1 with an adhesive layer protected by a release sheet 7 (Figure 1, Figure 2(d)). The product thus obtained is designated as "Decorative Panel B."

[0145] Example 1 <On-site application and evaluation of adhesion to the target surface and stability over time> The rectangular decorative panels A and B, each measuring 1 shaku (30 cm) x 3 shaku (91 cm), obtained as described above, were cut appropriately near the edges to form a strip of approximately 10 m. 2 The target surface was previously coated with a general-purpose primer. An operator peeled off the release sheets 7 one by one in front of the object T, and attached the release sheets 7 to the object surface immediately after peeling them off.

[0146] Approximately 10m 2 The time required to apply the adhesive to the entire surface of the target surface was approximately one hour for both decorative panel A and decorative panel B. All of the decorative panels 1 could be attached neatly, with no peeling at the edges, etc. Furthermore, for both decorative panels A and B, no peeling occurred over time for any of the decorative panels 1. Furthermore, no solvent or water seepage stains occurred on the decorative panels over time.

[0147] Comparative Example 1 <On-site application using quick-drying adhesive and evaluation of adhesion to the target surface and stability over time> Using the same reinforced veneer 2 obtained in Manufacturing Example 1 as the decorative board, we observed that 10 years ago, workers at a site had applied adhesive to both the reinforced veneer (decorative board) and the target surface, and then pasted 10 vertical and 20 horizontal pieces onto the same target surface. The object T is the inner wall of a public hall, and its material is the same as that of Example 1 except that its surface area is larger.

[0148] Using an organic solvent-based adhesive known as "quick-drying bond," the target surfaces were divided into groups, and the adhesive was applied to the entire surface of the reinforced veneer (decorative board) and the target surface corresponding to the reinforced veneer (decorative board). For each group, there was a difference of 0.5 hours between the first and last applications. Furthermore, the reinforced veneer (decorative board) with adhesive applied and the target surface were left for 15 minutes after all the adhesive had been applied, and then each reinforced veneer (decorative board) was attached to the target surface from left to right.

[0149] In Comparative Example 1, the area of ​​the target surface to which the decorative panel was attached was much larger than the area of ​​the target surface in Example 1, but when converted based on experience when the same area was installed, Comparative Example 1 only completed about 1 / 3 of the installation in one day (i.e., per unit time) compared to Example 1.

[0150] When observing the surface that had been installed 10 years ago, peeling was found on the reinforcing veneer (decorative panel) on the right half. The ideal "time from applying the adhesive to attaching it" is 15 to 20 minutes, but it took time to apply the adhesive all at once, and on top of that, after leaving it for the specified time after applying the adhesive, when each reinforcing veneer (decorative board) was attached to the target surface from left to right, the right side was left for a longer time after applying the adhesive than the left side, which is why the adhesive strength was reduced and only that part peeled off after 10 years. Furthermore, if even one board peeled off, it would mean that the entire construction was defective.

[0151] Comparative Example 2 <On-site application using water-based adhesive and evaluation of adhesion to the target surface and stability over time> In place of the organic solvent-dissolved (solvent-based / organic) adhesive known as "quick-drying bond" used in Comparative Example 1, a water-based adhesive (latex-based adhesive) in which the medium is water and the solute is emulsion polymerized microparticles, known as "water-based bond," was used, and the work was carried out in the same manner as in Comparative Example 1. The results were the same as in Comparative Example 1. In other words, while the ideal "time from application of adhesive to attachment" is 15 to 20 minutes, the time was longer than this and varied, and the adhesiveness of all adhesives similarly decreased over time, so the results after 10 years were similar to those of Comparative Example 1.

[0152] Comparative Example 3 <Summary> Comparative evaluation of work time with on-site construction without adhesive application Instead of the method adopted in Comparative Examples 1 and 2, in which adhesive was applied to multiple reinforcing veneers (decorative panels) in groups and then attached together after a certain period of time had passed, it was expected that the process would take even longer if adhesive were applied to each panel one by one and then attached to the target surface one by one after a certain period of time had passed (usually 15 to 20 minutes). In Comparative Examples 1 and 2, only about 1 / 3 of the work could be done in one day (i.e., per unit time) compared to Example 1 converted to the same area, but the method of Comparative Example 3 was even less efficient, processing less than 1 / 10 of that of Example 1, which was unrealistic.

[0153] Comparative Manufacturing Example 1 Comparative Example 4 <Forming the adhesive layer using a separate coater without using a non-carrier double-sided adhesive sheet> The same adhesive layer raw materials as in Manufacturing Example 2 were compounded and mixed to prepare an adhesive layer raw material composition, which was then applied to a reinforcing veneer 2 as in Manufacturing Example 1 using a curtain coater and a roll coater. The entire surface of the coating film was covered with a release sheet 7, and the entire surface was exposed to light in the same manner as in Production Example 2.

[0154] However, neither the curtain coater nor the roll coater was able to stably and uniformly apply (form) a thick adhesive layer 6 as in Production Example 2. Both the unexposed adhesive layer 6 and the exposed adhesive layer 6 had extremely poor adhesive strength, so there was no need to evaluate on-site application, adhesion to the target surface, and stability over time.

[0155] Comparative Manufacturing Example 2 Comparative Example 5 <Forming an adhesive layer using a different coater without using a non-carrier double-sided adhesive sheet (preparing and using an adhesive layer raw material (adhesive layer forming liquid) suitable for that coater)> 40 parts by weight of methyl methacrylate-butyl acrylate copolymer (weight average molecular weight 300,000), 5 parts by weight of adhesive resin (weight average molecular weight 3,000), 5 parts by weight of vinyl acetate, and 55 parts by weight of ethyl acetate as a coating solvent were mixed, stirred, and dissolved to obtain a transparent adhesive layer forming liquid.

[0156] The reinforced veneer 2 obtained in Production Example 1 was placed with the substrate 5 side facing up, and the adhesive layer-forming liquid obtained above was applied to the surface using a curtain coater. The adhesive layer forming liquid was heated and applied using a curtain coater, and then the coating solvent (ethyl acetate) was evaporated off during transportation for 30 seconds to form an adhesive layer 6 having a thickness of 15 μm. Thereafter, a release sheet 7 was attached onto the adhesive layer 6, and a comparative decorative board P was obtained.

[0157] The comparative decorative panels P, each rectangular and measuring 1 shaku (30 cm) x 3 shaku (91 cm), obtained as described above were peeled off the release sheets 7 one by one by an operator in front of the target T, and the panels were then attached to the target surface immediately after peeling the release sheets 7, in the same manner as in Example 1. A general-purpose primer had been applied to the target surface.

[0158] The time required to apply the comparative decorative panel P to the entire surface of the target surface was approximately 1 hour, which was as short as that of Example 1. However, the adhesive strength to the target surface was poor, partly due to the inability to increase the thickness of the adhesive layer 6. Some peeling was observed around the edges of the decorative panel, and peeling also occurred on some decorative panels over time.

[0159] As in Manufacturing Examples 2 and 4, when an adhesive layer 6 is applied and formed on a reinforced veneer 2 using a non-carrier double-sided adhesive sheet 9, an adhesive layer composition (raw material) suitable for adhesiveness can be used, and the adhesive layer 6 can be made thick.Therefore, compared to other methods such as Comparative Manufacturing Example 5, which use an adhesive layer composition for other coaters (suitable for those other coaters) and can only stably form a thin adhesive layer 6, the resulting natural wood veneer board 1 with an adhesive layer has extremely excellent adhesion to the object T and adhesion stability over time. [Industrial Applicability]

[0160] The adhesive layered natural wood veneer 1 of the present invention improves workability at the construction site, reduces defective construction that is discovered after a period of time due to peeling of some of the veneer 1, and reduces the total construction cost even for natural wood veneer 1, so it can be widely used for construction of the surfaces of buildings such as interior walls, exterior walls, and ceilings, as well as for construction of interior furnishings such as furniture and shelves. [Explanation of symbols]

[0161] 1. Natural wood veneer with adhesive layer 2 Reinforced veneer 3 Veneer 4 Adhesive layer 5 Base material 6 Adhesive layer 7 Release sheet 8 Support Sheet 9 Non-carrier double-sided adhesive sheet T Object (its surface is the object surface)

Claims

1. A "non-carrier double-sided adhesive sheet having an adhesive layer protected by a release sheet" is adhered in advance outside the construction site to the substrate side of a "reinforced veneer having, in order, a veneer made by slicing natural wood, an adhesive layer for adhering the veneer to a substrate, and a substrate," to produce a "natural wood veneer board with an adhesive layer having the reinforced veneer and the adhesive layer" protected by a release sheet, The release sheet is peeled off at the construction site, and the adhesive-layered natural wood decorative board from which the release sheet has been peeled is sequentially attached to a target surface, the adhesive layer contains a (meth)acrylic acid ester, a polymerizable monomer other than a (meth)acrylic acid ester, a polymerization initiator, a tackifying compound, and fine particles, and has a thickness of 10 μm or more and 500 μm or less; This construction method using a natural wood veneer with an adhesive layer is characterized in that a primer is applied in advance to a target surface having a large area equivalent to two or more rectangles arranged side by side, each having a short side length of 1 shaku (30 cm) to 10 shaku (303 cm), and then the natural wood veneer with an adhesive layer is pasted on top of the primer.

2. 2. The method for applying the adhesive-layered natural wood decorative board according to claim 1, wherein the (meth)acrylic ester comprises a (meth)acrylic ester having no polar group and a polyfunctional (meth)acrylic ester.

3. 2. The method for applying a natural wood decorative board with an adhesive layer according to claim 1, wherein the tackifier compound contains a hydrogenated compound.

4. 2. The method for installing a natural wood decorative board with an adhesive layer according to claim 1, wherein the natural wood decorative board with an adhesive layer has an overall thickness of 150 μm or more and 2000 μm or less.

5. 2. The method for installing a natural wood decorative board with an adhesive layer according to claim 1, wherein the natural wood decorative board with an adhesive layer does not contain any phenolic resin or vinyl chloride resin.

6. 2. A construction method using a natural wood veneer with an adhesive layer according to claim 1, wherein the natural wood veneer with an adhesive layer has a rectangular shape with at least one side measuring between 1 shaku (30 cm) and 10 shaku (303 cm).

7. 7. A method for applying the adhesive layer-attached natural wood veneer according to claim 1, wherein the target surface is an interior wall, an exterior wall, a ceiling, a door, built-in furniture, a partition, or furniture.

8. A construction method using a natural wood veneer with an adhesive layer according to any one of claims 1 to 6, in which the "natural wood veneer with an adhesive layer" is attached to a "vertically or downwardly disposed target surface" without applying adhesive to either the target surface or the substrate at the construction site.

9. A method for producing a natural wood decorative board with an adhesive layer protected by a release sheet for use in an application method using the natural wood decorative board with an adhesive layer according to any one of claims 1 to 6, comprising: A method for producing a natural wood veneer with an adhesive layer, the adhesive layer of which is protected by a release sheet, characterized by adhering a "non-carrier double-sided adhesive sheet having an adhesive layer and a release sheet" to the substrate side of "a veneer made by slicing natural wood, an adhesive layer for adhering the veneer to the substrate, and a reinforced veneer having the substrate, in that order."

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