Construction method using natural wood decorative plate with adhesive layer, and natural wood decorative plate with adhesive layer whose adhesive layer is protected by release sheet

Abstract

To provide a natural wood decorative plate 1 with an adhesive layer that makes use of natural materials and can be constructed easily and evenly, and a construction method thereof.SOLUTION: In a construction method, a non-carrier double-sided adhesive sheet 9 having an adhesive layer 6 protected by a release sheet 7 is preliminarily adhered outside of a construction site to "a reinforced veneer 2 having a veneer made by slicing natural wood, an adhesive layer, and a base material", to produce a natural wood decorative plate 1 with an adhesive layer protected by a release sheet 7, and the natural wood decorative plate 1 is attached to a target surface at the construction site while peeling off the release sheet 7. The adhesive layer 6 contains a (meth)acrylic acid ester group and a (meth)acrylic acid ester copolymer, and has a thickness of 10 μm to 500 μm. A primer is applied in advance to the target surface having a large area in which two or more rectangles with short sides of 30 cm to 303 cm can be arranged, and the decorative plate 1 is attached on top of that. Also provided is the natural wood decorative plate 1 with an adhesive layer protected by a release sheet 7 for the construction method.SELECTED DRAWING: Figure 2

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 has been formed in advance by a specific method outside the construction site, and to a "construction method using the natural wood veneer board with an adhesive layer at the construction site". [Background technology]

[0002] TECHNICAL FIELD The work of attaching resin decorative panels to target surfaces such as interior and exterior walls, floors, ceilings, doors, etc. of buildings, as well as partitions, furniture, etc., in order to impart waterproofing, moisture resistance, flame retardancy, fire resistance, design properties, etc. is widely carried out, and the outermost surface of the decorative panel is mainly formed of a resin sheet made of a synthetic resin such as polyvinyl chloride resin, melamine resin, etc.

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

[0004] Known methods for applying a resin decorative panel to a target surface at a construction site, etc. include a method in which a worker at the construction site uses an adhesive to attach it to the target surface, or a method in which an adhesive layer is first laid as the bottom layer and 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 outermost surface is formed from a resin sheet, natural wood decorative boards whose outermost surface is formed from a "veneer made by slicing natural wood" are also known. For example, Patent Document 1 discloses a flame-retardant fine wood decorative sheet that has, from the top, veneer, "paper or nonwoven fabric," metal foil, and another "paper or nonwoven fabric," in that order, 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 that order.

[0006] Furthermore, Patent Document 3 discloses a flame-retardant fine wood decorative sheet that is made by laminating and pressing together 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 containing a flame retardant, and "paper or nonwoven fabric."

[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 thermally conductive sheet, and a backside thermoplastic resin layer, and then pressure-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 describes that the surface is primed, a starch-based adhesive is applied, and then the natural wood tissue paper is attached.

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

[0010] However, natural wood decorative panels are expensive compared to resin decorative panels made of polyvinyl chloride resin or the like, and therefore are not widely used. Furthermore, because natural wood veneer is expensive, and in order to give it an even more luxurious feel; even if an attempt was made to mass-produce this by applying an adhesive layer in advance to the bottom layer and protecting it with a release sheet, small lots would be required due to the construction site, increasing costs; and adhesives with suitable adhesive properties and application methods 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 luxurious, but this trend has been toward making the outermost layer, "resin sheets such as polyvinyl chloride resin," more luxurious, rather than using "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, the organic solvent is evaporated under heating to form a self-adhesive layer, and a natural wood veneer with a self-adhesive layer is produced, and at the construction site, this is sequentially attached to the target surface. 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 skill level 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 variation 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 techniques and natural wood veneer that can be applied semi-permanently to target surfaces at the construction site without any problems.

[0014] In Patent Document 7, the 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 distilled off to form the self-adhesive layer. However, this approach resulted in problems such as the adhesive layer not being thick enough, insufficient adhesion to the target surface at the application site, residual organic solvent (coating solvent), time required to completely evaporate the coating solvent, and a complicated manufacturing process that increased production 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] JP 2004-216722 A [Patent Document 5] JP 2010-089506 A [Patent Document 6] JP 2013-022953 A [Patent Document 7] JP 2018-089788 A Summary of the Invention [Problem to be solved by the invention]

[0016] The present invention has been made in consideration of the above-mentioned background technology, and its object is to provide a natural wood veneer 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] As a result of extensive research into overcoming the above problems and resolving the above-mentioned issues, the inventors have discovered that by previously providing an adhesive layer of a specific composition on the base material side of the reinforced veneer using a specific method, the variation in the application surface from one decorative board to another is significantly improved, there is no increase in costs when including application costs at the application site, and furthermore, even an unskilled worker can easily apply the natural wood veneer uniformly because the adhesive layer has extremely high adhesion, thereby completing the present invention.

[0018] That is, the present invention is a construction method in which a "non-carrier double-sided adhesive sheet having an adhesive layer protected by a release sheet" is adhered in advance outside of the construction site to the substrate side of a "reinforced veneer having, in order, a veneer formed 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 construction site, and the natural wood veneer with an adhesive layer from which the release sheet has been peeled off 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 veneer 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] Further, the present invention relates 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 a support sheet, and irradiating the sheet with light to photopolymerize a portion of the (meth)acrylic acid ester group. The present invention provides a construction method using the natural wood veneer board with an adhesive layer.

[0021] The present invention also provides a construction method using the natural wood veneer board 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 mass% or more and 80 mass% or less.

[0022] The present invention also provides a construction method using the natural wood decorative board with an adhesive layer, the natural wood decorative board having 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 veneer board with an adhesive layer, wherein the natural wood veneer board with an adhesive layer does not use either phenol resin or polyvinyl chloride resin.

[0024] The present invention also provides a method for installing the natural wood veneer with an adhesive layer, the target surface of which 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 disposed target surface or a target surface that faces downward" without applying an adhesive to either the target surface or the base material at the construction site.

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

[0027] The present invention also provides a natural wood veneer 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 veneer is made of "a veneer formed by slicing natural wood, an adhesive layer for adhering the veneer to a base material, and a reinforced veneer having a base material," and a "non-carrier double-sided adhesive sheet having an adhesive layer and a release sheet" is adhered to the base material side of the veneer. Effect of the Invention

[0028] By using the natural wood veneer with an 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 excellent appearance and feel can be easily installed by anyone, even without expertise, at the construction site without placing a burden on the worker. Compared to "printed polyvinyl chloride resin or other resin sheets," the adhesive-layered natural wood veneer 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 polyvinyl chloride resin" and "conventional natural wood decorative boards," decorative boards to which an adhesive layer has been applied in advance are known. However, when applying veneer or veneer-coated veneer made by slicing natural wood to a target surface, the veneer is expensive, so adhesive is applied manually on-site to maintain a luxurious feel; compared to veneer using "resin sheets such as polyvinyl chloride resin," there is significantly less demand for veneer-coated veneer, and the number of lots used per pattern (wood grain, etc.) is small, so mass-producing "veneer with an adhesive layer already applied to the bottom layer" in a factory or the like would increase the cost of the veneer; adhesives with suitable adhesive properties, film thicknesses, and application methods have not yet been developed; in particular, suitable application methods for (reinforcing) veneer, which is a flat plate, have not yet been developed; it is more profitable for veneer-coated veneer to be handled in small lots by a small number of companies, rather than being widely used; "veneer" and "reinforcing veneer made by attaching veneer to a base material" are more rigid than resin sheets, so they adhere less well to the target surface; and for these reasons, workers at the construction site manually applied adhesive to each sheet and attached it to the target surface.

[0030] Typically, decorative panels that use veneer with a high bending modulus cannot be supplied in rolls and are supplied in sheets for ease of work, and are often rectangular in shape and size with one side being the longest. Therefore, when applying an adhesive such as starch paste to attach a decorative board 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 board, which places a burden on the worker and significantly increases the time required for the work.

[0031] Furthermore, whether the adhesive (pressure-sensitive adhesive) is a solvent-based or organic-based adhesive, known as a "quick-drying bond," or a water-based adhesive, known as a "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 has to be applied), which means that the leaving time can vary from long to short. This results in inconsistent levels of adhesion in the applied adhesive layer, and after several years of application, some rectangular decorative panels have problems such as curling of the edges and falling off.

[0032] For example, if the adhesive described above is applied to multiple decorative boards and a large target surface at once in order to ensure the time to leave them and improve workability, and then the decorative boards are attached to the target surface one by one, the adhesiveness of some of the decorative boards will decrease depending on the length of time they are left there.As a result, problems such as the edges of some of the decorative boards curling up or some of the decorative boards peeling off over time after completion have occurred. In addition, in the adhesives, organic solvents remain in quick-drying glues, and water remains in water-based glues and starch pastes even after completion, and over time, the organic solvents and water can penetrate the veneer and seep out onto the surface of the veneer, 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 time the adhesive layer (adhesive layer) is left standing. In the present invention, since a specific adhesive layer is applied by a specific method, the adhesiveness (bonding) of the surface of the adhesive layer does not decrease even if the time is long. Therefore, it is not possible for the edges of some decorative panels to curl up or fall off.

[0034] Currently, starch paste is widely used as an adhesive for target surfaces in order to prevent the occurrence of allergic symptoms caused by formaldehyde and the like. However, when using this starch paste, the adhesive is usually applied in a batch in order to prioritize ease of work, particularly 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 variation in the "degree of adhesion to the target surface" between the decorative panels after construction; and peeling of some of the decorative panels from the target surface over many years.

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

[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 application" is applied to the natural wood veneer, and the above-mentioned problems cannot occur. In more detail, if the material 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 is not likely to evaporate (volatilize). Furthermore, unlike the application solvents "organic solvents and water," it is not likely to penetrate the veneer over time and will not seep out onto the surface of the veneer and mar the appearance.

[0038] As mentioned above, the adhesiveness of starch paste decreases as water evaporates, and the adhesiveness of solvent-type adhesives other than starch paste and emulsion-type adhesives also decrease as the coating solvent evaporates, and the adhesiveness of curing-type adhesives also decreases as the adhesive hardens.

[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 does not change regardless of the pros and cons. That is, as described above, by applying an adhesive layer of a specific material (raw material) in a specific manner, the adhesiveness (bonding) of the surface of the adhesive layer does not decrease no matter how long it is left standing. Therefore, it is impossible to say that some decorative panels will have their edges curled up or fall off.

[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 terminals 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 method of providing the adhesive layer in the present invention, the thickness of the adhesive layer can be increased, so that if the thickness is within a suitable range, the adhesive layer does not have poor adhesion (adhesion). Rather, since there is no unevenness in the adhesion of each individual decorative board, there is no problem of peeling off of (some) decorative boards over time. In the construction of decorative boards, even if only a part of it (one sheet) peels off, the edges turn up, or water or other coating solvent seeps out, etc. over time, and this can result in liability issues for the entire construction. When the natural wood decorative board with adhesive layer of the present invention is attached to a target surface, there is absolutely no variation in the adhesiveness of each individual decorative board to the target surface, so when all of these factors are considered together, it is extremely excellent in terms of stability over time and cost-effectiveness.

[0042] The following specific figures are merely 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 an adhesive layer already applied" of the present invention than in the case of "a case in which a veneer is supplied simply pasted on a base material, and the decorative board is applied on-site by a worker 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, so the construction cost (labor cost) of the worker is about 1.5 to 2 times more expensive in the case of "a case in which a veneer is used with an adhesive layer already applied" of the present invention. 2This is about 0.7 to 0.8 times the cost 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 makes it possible to apply a stronger and thicker adhesive layer than when an adhesive layer is applied using other coaters such as a curtain coater, roll coater, or screen printer, and therefore makes it possible (even by an inexperienced worker) to firmly attach a specific rectangular natural wood veneer to the target surface at the construction site without variation between panels. Therefore, even over many years, peeling of the veneer is less likely to occur, there is no variation between natural wood veneer boards, and because it is solvent-free, there is no seepage or staining of the veneer surface.

[0044] In addition, the adhesive-layered natural wood veneer of the present invention does not have the odor peculiar to synthetic resins, and does not use phenolic resins containing formaldehyde, polyvinyl chloride resins, 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 polyvinyl chloride resin, no harmful substances are produced when incinerated for disposal.

[0045] Furthermore, since there is no need to use adhesives at the construction site, there are no problems for workers or the surrounding environment due to organic solvents contained in the adhesives. Moreover, 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 veneer board, there is no room for the adhesive-layered natural wood veneer board of the present invention to contain a coating solvent.

[0046] Even when natural wood veneer boards with an adhesive layer are manufactured outside a construction site such as a factory, conventionally, a coating liquid (adhesive layer forming liquid) in which the adhesive layer components are dissolved 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 approach resulted in problems such as the adhesive layer not being able to be made thick, insufficient adhesion to the target surface at the application site, lack of stability over time, residual organic solvents (coating solvents) remaining, seepage onto the veneer surface, and a complicated manufacturing process that was costly.

[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 occur with the solvent that may affect workers or the surrounding environment, 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 material (the time it is left on the material after the adhesive is applied), and the cost of application at the construction site can be significantly reduced compared to conventional methods. Furthermore, even many years after application, the "conventional problems" of "one or several layers that were not properly attached peeling off from the target surface" do not occur, and the film remains uniform over the entire target surface, demonstrating excellent stability over time. [Brief description of the drawings]

[0049] [Figure 1] FIG. 1 is a schematic cross-sectional view showing the configuration of layers essential to the "natural wood veneer board with an adhesive layer protected by a release sheet" used in the application method of the present invention. [Diagram 2] 1 is a schematic flow diagram showing a process for producing a "natural wood veneer board with an adhesive layer protected by a release sheet" in the present invention using a non-carrier double-sided adhesive sheet. That is, it is a schematic flow diagram showing a process for providing an adhesive layer of a natural wood veneer board with an adhesive layer in the present invention using a non-carrier double-sided adhesive sheet. [Diagram 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. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0051] [Natural wood veneer with adhesive layer used in the construction method of the present invention (veneer 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 3 formed by slicing natural wood, an adhesive layer 4 for adhering the veneer 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 is adhered 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 veneer 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 for adhering 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", which are 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 board 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 base material side of the reinforcing veneer 2 (see Figures 1 and 2). Hereinafter, the "natural wood veneer board with an adhesive layer used in the application method of the present invention" may be abbreviated simply as the "veneer board of the present invention." Since the adhesive layer 6 of the "veneer board 1 of the present invention" is protected by a release sheet 7, the "veneer board 1 of the present invention" is protected by the release sheet 7 (see FIG. 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 grains are preferred as the decorative board 1 of the present invention. The veneer 3 can be produced by a known method, and is produced by heating it, if necessary, in the presence of water or water vapor, and then cutting it with a slicer or the like. In addition, the surface of the veneer 3 obtained by cutting can be filed with a file or the like to make it thinner or smoother, or to bring out the fine irregularities and wood 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 adhesive layer 6 between the substrate 5 and the target surface, may peel off easily, resulting in the expensive veneer 3 being wasted, whereas 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 veneer 3 to the substrate 5 is not particularly limited, but is preferably made of a polyurethane adhesive, an epoxy resin adhesive, a polyvinyl acetate adhesive, a vinyl acetate-(meth)acrylic acid ester copolymer adhesive, etc. Examples of the adhesive formulation include latex adhesives, aqueous vinyl urethane adhesives, thermosetting adhesives, and two-liquid adhesives.

[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 simultaneously (heat-press) bond all of the plate-like objects, including the veneer 3 and base material 5, with an adhesive interposed between them.

[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, as the substrate 5, paper or nonwoven fabric is preferred from the viewpoints of high strength, flexibility, ease of processing, low cost, ease of impregnation / containing 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 from 1 / 20 to 1 / 2 of the thickness of the veneer 3 to be adhered thereto, more preferably from 1 / 10 to 1 / 3, and particularly preferably from 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 base material 5 is paper or nonwoven fabric, the basis weight is 10 to 100 g / m 2 Preferably, it is 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 required for 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 manufacturing and handling may be difficult. 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 pressure-sensitive 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 refers to a layer that has adhesive properties and is provided for attaching the reinforcing veneer 2 to an object T. It is preferable that the adhesive properties do not decrease substantially over time from the manufacture of the decorative board 1 in a factory or the like to the construction (use) at the site, and this is possible according to the adhesive layer composition and adhesive layer formation method described below.

[0064] As mentioned above, conventionally, in order to improve workability and shorten work time, workers would usually first apply adhesive to both multiple "decorative boards having veneer 3" and the corresponding "(large area) target surface," then leave them for a certain period of time before attaching the multiple decorative boards 1. However, this meant that the leaving time varied from one decorative board 1 to another, and the adhesive strength of the adhesive varied from one decorative board 1 (and from one location on the target surface to another), so that after several years of construction, some decorative boards 1 (most of which were decorative boards 1 that had adhesive applied first and were left for a long time) had problems such as curling of edges and falling off.

[0065] In the decorative board 1 of the present invention, a specific adhesive layer 6 described below is used, and the adhesive layer 6 is adhered to the base material side of the reinforcing veneer 2 in a factory or the like using a specific method described below. This means that at the construction site, workers do not have to spread or apply the adhesive (glue) but can apply it to the target surface while 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. In addition, by using an adhesive layer 6 of a specific composition as described below, the adhesiveness (bonding) 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 the edges 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 in which an adhesive layer 6 is protected by a release sheet 7, and which is composed of "a veneer 3 formed by slicing natural wood, an adhesive layer 4 for adhering the veneer 3 to a base material 5, and a reinforcing veneer board 2 having the base material 5," with "a non-carrier double-sided adhesive sheet 9 having an adhesive layer 6 and a release sheet 7" adhered to the side of the base material 5 (see Figures 1 and 2). The present invention also relates to a natural wood veneer board 1 with an adhesive layer in which the adhesive layer 6 is protected by a release sheet 7, and this "veneer board protected by a release sheet 7" can be the subject of sale or transfer.

[0068] The configuration 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 for the decorative board of the present invention (more specifically, in the preparation process for the non-carrier double-sided adhesive sheet 9 in the manufacturing process for 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) and (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 that are 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 units constituting the (meth)acrylic acid ester copolymer are 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, depending 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-mentioned types, or (specifically) one described below, the following effects are obtained: performance is stable 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 adhesion 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; it can be made solvent-free; there are no allergy problems; 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, the adhesive-layered natural wood veneer board 1 is as described below, and it is preferable that it does not use either phenol resin or polyvinyl chloride resin from the viewpoints of safety for workers and consumers, environmental characteristics, etc.

[0075] <<Non-carrier double-sided adhesive sheet protected with 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 being protected by a release sheet, and is applied (adhered) to the side of the base material 5 of the reinforcing veneer 2 (see Figs. 2(c) and (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 described below with light to polymerize it. The "adhesive layer-forming composition" may contain, in addition to the (meth)acrylic acid ester described below, at least one of the following, if necessary: ​​a "polymerizable monomer other than a (meth)acrylic acid ester", a polymerization initiator such as a photoradical polymerization initiator, a tackifier 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 (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, a portion of the film is polymerized by irradiating light or heating 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 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 of a photopolymerization initiator, its type, 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 obtain a "non-carrier double-sided adhesive sheet 9 protected by a release sheet 7" with the adhesive layer 6 exposed (see FIG. 2(c)). In addition, the release sheet 7 remains until the time of construction; in other words, the one that remains until the time of construction is defined as the peel-off sheet, and the one 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 veneer 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 board 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 the (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 a suitable range, 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 within the above range, for example, by adjusting the blending amount of the "(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 is immersed in tetrahydrofuran (THF) at 40°C for 48 hours, and the dry mass of the insoluble portion of the adhesive layer thereafter

[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 easily 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, and in addition thereto, (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 to include preferably one type, more preferably two types, further preferably three types, and particularly preferably four types 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 are 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 acrylic acid ester or methacrylic acid ester (or both).

[0089] The (meth)acrylic acid ester group preferably includes "(1-1) a polar group-free (meth)acrylic acid ester" and "(1-2) a polar group-containing (meth)acrylic acid ester, and / or (1-3) a 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) (Meth)acrylic acid esters not containing polar groups>>>> (1-1) The ester of the polar group-free (meth)acrylic acid ester is not particularly limited, but is preferably an alkyl ester, an aryl ester, an aralkyl ester, or the like having 1 to 22 carbon atoms. The number of carbon atoms in each of the three types of esters is more preferably 18 or less, further preferably 16 or less, particularly preferably 2 to 12, and most preferably 4 to 8. It is desirable to include, as the "(1-1) polar group-free (meth)acrylic acid ester", 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. Also, unreacted (unpolymerized) "(meth)acrylic acid ester group A" is 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 the most preferred. These may be used alone, or in combination of two or more kinds, or in combination with the above-mentioned ones.

[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] The content of the (1-1) polar group-free (meth)acrylic acid ester, in total, is preferably from 20% to 95% by mass, more preferably from 30% to 90% by mass, and particularly preferably from 40% to 85% by mass, based on the entire adhesive layer 6. When the content is more than the above amount, 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, but 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 (-CH 2 CH 2 O-), propylene glycol residue, diethylene glycol residue, dipropylene glycol residue, triethylene glycol residue, tripropylene glycol residue, furfuryl group, glycidyl group, and the like.

[0098] Further examples include groups in which an alkylene group is bonded to the above-mentioned 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, relative to the entire adhesive layer 6 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. By including the content in the above range, it becomes easy to obtain an adhesive layer 6 that has both low temperature adhesion and high temperature adhesion (retention). For example, even if the decorative board 1 is applied in winter and time passes and it becomes summer, it is possible to prevent the decorative board 1 from shifting or falling off.

[0101] <<<<(1-3) Polyfunctional (meth)acrylic acid esters>>>> (1-3) The polyfunctional (meth)acrylic 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 of the polyfunctional (meth)acrylic ester 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, and poly(meth)acrylate. Examples of the acrylate copolymer include acrylate-coated poly(meth)acrylate, ...

[0102] (1-3) The content of the polyfunctional (meth)acrylic acid ester, in total, relative to the entire adhesive layer 6 is preferably 0.01 mass% or more and 16 mass% or less, more preferably 0.10 mass% or more and 13 mass% or less, and particularly preferably 0.2 mass% or more and 10 mass% or less. By including the content in the above range, it becomes easy to obtain an adhesive layer 6 that has both low temperature adhesion and high temperature adhesion (retention). For example, even if the decorative board 1 is applied in winter and time passes and it becomes summer, it is possible to prevent the decorative board 1 from shifting or falling off.

[0103] By containing "(1-2) a polar group-containing (meth)acrylic acid ester and / or (1-3) a polyfunctional (meth)acrylic acid ester", the above-mentioned effects can be obtained.

[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 amides, (meth)acrylic acid alkyl amides, styrene, divinylbenzene, α-methylstyrene, o-methylstyrene, p-methylstyrene, maleic acid (anhydride), vinyl alkyl ethers, 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, which may or may not have a (meth)acryloyl group at one end, or partially hydrogenated products thereof, and the like.

[0105] (2) The total content of polymerizable monomers other than (meth)acrylic acid esters is preferably 6 mass% or less, more preferably 0.1 mass% or more and 5 mass% or less, and particularly preferably 0.2 mass% or more and 3 mass% or less, based on the entire 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). Since the polymerization initiation time point can be clearly determined, a photoradical polymerization initiator is preferable, and a radical polymerization initiator using visible light or ultraviolet light is more preferable. 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 tackifier compound, so 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 tackifier compound, but it is preferable that the tackifier compound is a tackifier resin rather than a tackifier monomer.

[0109] In the case of a tackifier resin, although there are no limitations, the weight average molecular weight is preferably from 500 to 40,000, more preferably from 1,000 to 20,000, and particularly preferably from 1,500 to 10,000. 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 having 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 softening point thus measured.

[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 terpene and terpene; 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 tackifier compound is contained, the content of the tackifier 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 containing 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 per 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, preservatives, and the like.

[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 board 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 plate 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 of 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 adhered in advance outside the construction site and an adhesive layer 6 is formed on a decorative board 1 protected by a release sheet 7, can obtain the effects described above or 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, a roll coater, a screen printer, a 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, whereby a portion of it is polymerized, and the adhesive layer 6 is completed (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., but when producing the adhesive layer 6 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 eliminate light absorption. In addition, when radical polymerization is carried out, a material having gas barrier properties is preferred in order 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 polyesters, polyolefins, 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 coating surfaces, the surfaces that come 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 veneer of the present invention] <Size, shape, etc. of the natural wood veneer with adhesive layer (the veneer of the present invention)> The shape and size of the decorative board 1 of 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) inclusive." To achieve this, it is preferable for the decorative panel 1 to have a size within the range mentioned above, and it is particularly preferable for both sides to be between 1 shaku (30 cm) and 10 shaku (303 cm) inclusive. Within this range, it is possible to suitably apply (attach) to a target surface having a large area, the veneer 3 is less likely to crack, workability on site is improved, and so on.

[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 occurring when the thickness of the veneer 3 or each layer is too thin may occur, and in particular the adhesion to the target surface and the adhesive stability over time may decrease. According to the "method of 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 occurring when the veneer 3 or each layer is too thick may easily occur.

[0127] <Construction method, construction location, target surface, etc.> In the construction method of the present invention, a non-carrier double-sided adhesive sheet 9 is adhered to a reinforcing veneer 2 outside the construction site in advance to produce a "decorative board 1 protected by a release sheet 7". At the construction site, the release sheet 7 is peeled off and the decorative board 1 from which the release sheet 7 has been peeled off is then sequentially attached to the target surface of the object T. Unlike the conventional method, it is no longer necessary 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 between applying the adhesive and attaching it. A large decorative board 1 may be cut on-site to fit the size of the target surface. 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 attached, but examples include interior walls, exterior walls, ceilings, doors, built-in furniture, screens (partitions), or furniture in halls, elevators, rooms, corridors, and spaces 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 generally vertical surfaces, because the grain of the natural wood is clearly visible and it is subject to less impact than a floor.

[0129] In particular, application to large target surfaces such as interior walls, exterior walls, and ceilings is preferred because this makes it easier to achieve the effects of the present invention described above, namely, "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 and pasting it at the construction site." 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 arranged vertically or horizontally, each having a side measuring between 3 shaku (91 cm) and 10 shaku (303 cm), as this makes it particularly easy to achieve the effects of the invention.

[0130] The present invention is also a construction method using a veneer in which the "natural wood veneer with adhesive layer 1" is attached to a "vertically-present target surface (see Figure 3) or a target surface that faces downward" without applying an 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, is stable over time, and there is no (cannot be) any difference in adhesiveness between individual decorative boards 1, so that the method 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 above-mentioned natural wood decorative board 1 with an adhesive layer, and more preferably, to the natural wood decorative board 1 with an adhesive layer used in the construction method of the present invention. That is, the present invention provides a natural wood veneer board 1 with an adhesive layer protected by a release sheet 7 for use in the above-mentioned "construction method using a natural wood veneer 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 "in order, a veneer 3 made by slicing natural wood, an adhesive layer 4 for adhering the veneer 3 to a base material 5, and a reinforcing veneer 2 having the base material 5" have "a non-carrier double-sided adhesive sheet 9 having an adhesive layer 6 and a release sheet 7" adhered to the side of the base material 5. EXAMPLES

[0132] The present invention will be described in more detail below with reference to examples and comparative examples. However, the present invention is not limited to these examples as long as it does not depart from the gist of the present invention.

[0133] Manufacturing Example 1 <Manufacturing of 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 adhesive 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 a manufacturing plant by blending and mixing the adhesive layer raw materials described below.

[0135] Classification Raw material name Mixture ratio 1-1 2-Ethylhexyl acrylate 65 parts by weight 1-1 n-Butyl acrylate 10.0 parts by weight 1-3 Trimethylolpropane triacrylate 1.00 parts by mass 2. Acrylic acid 5.0 parts by weight 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 weight 5. Glass powder 0.50 parts by weight 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 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 PET film (thickness: 50 μm) that had been subjected to a silicone release treatment.

[0137] In this state, the irradiation intensity from the release sheet 7 side was 5 mW / cm 2 Then, ultraviolet light and visible light were irradiated from a chemical lamp for 15 minutes (see Figure 2(b) (except that the irradiated side was reversed)), 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)).

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

[0139] Production Example 3 <Production of 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 the product was 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 (Figures 1 and 2(d)). The product thus obtained is designated "decorative panel A."

[0140] Production Example 4 <Production of "non-carrier double-sided adhesive 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 Mixture ratio 1-1 2-Ethylhexyl acrylate 100 parts by weight 1-2 β-Carboxyethyl acrylate 7.0 parts by weight 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℃ and 140℃) 10.0 parts by weight 5. Glass powder 1.00 parts by weight 3. 2,2-Dimethoxy-2-phenylacetophenone 0.50 parts by mass

[0142] In this state, the coating surface was covered with a release sheet 7 in the same manner as in Production Example 2 (FIG. 2). Irradiation intensity 2mW / cm 2 The laminate was irradiated with ultraviolet light 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 mass % and a glass transition temperature (Tg) of -30°C.

[0144] Production Example 5 <Production of 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 (bonded) to the base material 5 side to obtain a natural wood veneer board 1 with an adhesive layer protected by a release sheet 7 (Figures 1 and 2(d)). The product thus obtained is designated as "decorative panel B."

[0145] Example 1 <On-site application and evaluation of adhesion to 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 make a length of about 10 m. 2 The target surface was coated with a general-purpose primer in advance. 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.

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

[0147] Comparative Example 1 <On-site application using quick-drying adhesive and evaluation of adhesion to target surface and stability over time> Using the same reinforcing veneer 2 obtained in Manufacturing Example 1 as the decorative board, we observed that 10 years ago, a worker at the site had applied adhesive to both the reinforcing veneer (decorative board) and the target surface, and had pasted 10 pieces vertically and 20 pieces horizontally 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 area is larger.

[0148] Using an organic solvent-soluble adhesive known as "quick-drying glue," the target surfaces were divided into groups, and the adhesive was applied to the entire surface of the reinforcing veneer (decorative board) and the target surface corresponding to the reinforcing veneer (decorative board). For each group, there was a difference of 0.5 hours between the first application and the last application. Furthermore, the reinforcing veneer (decorative board) with adhesive applied and the target surface were left to stand for 15 minutes after all of the adhesive had been applied, and then each reinforcing 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 far larger than the area of ​​the target surface in Example 1. However, based on experience, if the same area were to be worked on, it would turn out that in Comparative Example 1, only about 1 / 3 of the work could be done 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 in 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, so the adhesiveness decreased and it is thought that only that part peeled off after 10 years. Furthermore, if even one board peels 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 target surface and stability over time> When a so-called "water-based bond" adhesive (latex-based adhesive) was used instead of the so-called "quick-drying bond" organic solvent-dissolved adhesive (solvent-based / organic-based) used in Comparative Example 1, which is a "water-based adhesive in which the medium is water and the solute is emulsion polymerized microparticles," (a latex-based adhesive) known as a so-called "water-based bond," and the work was carried out in the same manner as in Comparative Example 1, the results were similar to those of Comparative Example 1. In other words, while the ideal "leave time from application of the adhesive to attachment" is 15 to 20 minutes, the leave time was longer than that 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 method of applying adhesive to each panel one by one and then attaching each panel one by one to the target surface after a certain period of time had passed (usually left for 15 to 20 minutes) would require even more work time. 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, treating only 1 / 10 or less 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 Production Example 2 were blended and mixed to prepare an adhesive layer raw material composition, which was then applied onto a reinforcing veneer 2 as in Production 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 <Form the adhesive layer using another 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 thereof 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 boards P, rectangular and measuring 1 shaku (30 cm) x 3 shaku (91 cm), obtained as described above, were peeled off one by one by an operator in front of a target object T in the same manner as in Example 1, and the release sheets 7 were attached to the target surface immediately after peeling. A general-purpose primer was applied to the target surface.

[0158] The time required for application to the entire surface of the target surface was about 1 hour for the comparative decorative board P, which was as short as that of Example 1, but the adhesion 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 board, and peeling also occurred over time for some decorative boards.

[0159] As in Production 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 adhesion can be used and the adhesive layer 6 can be made thick. Therefore, compared to other methods such as Comparative Production 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 target 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 costs even for natural wood veneer 1, and is therefore widely used for construction of the surfaces of buildings such as interior walls, exterior walls, and ceilings, as well as for interior construction of furniture, shelves, etc. [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 (whose surface is the target 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 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 layer-attached natural wood decorative board from which the release sheet has been peeled off 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, 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 attached on top of the primer.

2. The method for applying the adhesive layer-attached natural wood veneer board according to claim 1, 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, a polar group-containing (meth)acrylic acid ester, and / or a polyfunctional (meth)acrylic acid ester.

3. 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.

4. The method for applying the adhesive-layered natural wood decorative board according to claim 1, wherein the adhesive layer further contains a tackifier compound.

5. The method for applying the adhesive layer-attached natural wood veneer board according to claim 4, wherein the adhesive-imparting compound contains hydrogenated rosin, rosin ester, disproportionated rosin, hydrogenated terpene, terpene, hydrogenated petroleum resin, petroleum resin, hydrogenated xylene resin, or xylene resin.

6. 2. A construction method using a natural wood veneer board with an adhesive layer according to claim 1, 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.

7. 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.

8. 2. The method of claim 1, wherein the adhesive-layered natural wood decorative board is one that does not use a phenolic resin or a polyvinyl chloride resin.

9. 2. The method of claim 1, wherein the adhesive-layered natural wood veneer has a rectangular shape with at least one side measuring 1 shaku (30 cm) to 10 shaku (303 cm).

10. 10. A method for installing a natural wood veneer board with an adhesive layer according to claim 1, wherein the target surface is an interior wall, an exterior wall, a ceiling, a door, a built-in piece of furniture, a partition, or furniture.

11. A construction method using a natural wood veneer with an adhesive layer according to any one of claims 1 to 9, in which the "natural wood veneer with an adhesive layer" is attached to a "vertically disposed target surface or a downwardly disposed target surface" without applying an adhesive to either the target surface or the base material at the construction site.

12. A natural wood veneer board with an adhesive layer protected by a release sheet for use in a construction method using the natural wood veneer board with an adhesive layer according to any one of claims 1 to 9, A natural wood veneer with an adhesive layer, in which the adhesive layer is protected by a release sheet, is characterized in that the veneer is made of "a veneer formed by slicing natural wood, an adhesive layer for adhering the veneer to a base material, and a reinforced veneer having a base material," and a "non-carrier double-sided adhesive sheet having an adhesive layer and a release sheet" is adhered to the base material side of the reinforced veneer having a base material.

13. A natural wood veneer board with an adhesive layer, the adhesive layer being protected by a release sheet, A natural wood veneer with an adhesive layer, in which the adhesive layer is protected by a release sheet, is characterized in that the veneer is made of "a veneer formed by slicing natural wood, an adhesive layer for adhering the veneer to a base material, and a reinforced veneer having a base material," and a "non-carrier double-sided adhesive sheet having an adhesive layer and a release sheet" is adhered to the base material side of the reinforced veneer having a base material.

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