Installation method using natural wood veneer with an adhesive layer, and natural wood veneer with an adhesive layer protected by a release sheet.

Abstract

To provide a natural wood decorative board with an adhesive layer that makes the most of natural materials and can be easily and uniformly installed, and an installation method thereof. [Solution] A non-carrier double-sided adhesive sheet having an adhesive layer 6 protected by a release sheet 7 is adhered to a "reinforced veneer 2 having a veneer 3 made by slicing natural wood, an adhesive layer 4, and a substrate 5" outside the construction site to produce a natural wood veneer 1 with an adhesive layer protected by a release sheet 7, which is then attached to the target surface at the construction site while peeling off the release sheet 7. The adhesive layer 6 contains a (meth)acrylic acid ester, a polymerizable monomer other than a (meth)acrylic acid ester, a polymerization initiator, a tackifying compound, and fine particles, and has a thickness of 10 μm to 500 μm. A primer is applied in advance to a target surface large enough to accommodate two or more rectangles with short sides of 30 cm to 303 cm, and the decorative board 1 is then attached onto the surface.

Description

Technical Field

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

Background Art

[0002] The operation of attaching a resin decorative board to the inner wall, outer wall, floor, ceiling, door, etc. of a building, and the target surfaces of partitions, furniture, etc. to impart waterproofness, moisture resistance, flame retardancy, fireproofness, designability, etc. is widely carried out. The outermost surface of the decorative board is mainly formed of a resin sheet made of a synthetic resin such as vinyl chloride resin, melamine resin, etc.

[0003] That is, currently, the mainly used decorative board has at least a resin sheet, an adhesive layer for adhering the sheet to a base material, and a base material from the top. And resin decorative boards having a protective layer for protecting the surface against impact, etc., a pattern layer / coloring layer for imparting designability, a flame retardant layer for imparting flame retardancy / fireproofness, a moisture resistant layer for resisting humidity, etc. on their surfaces or between them are also known.

[0004] As a method of applying a resin decorative board to a target surface at a construction site or the like, there are known a method in which an operator uses an adhesive to attach it to the target surface at the construction site, and a method in which an adhesive layer is provided in the lowermost layer in advance, the adhesive layer is protected with a release sheet, and an operator peels off the release sheet at the construction site and attaches it to the target surface.

[0005] On the other hand, instead of the resin decorative board having a resin sheet as the outermost surface as described above, a natural wood veneer having a "butt plate formed by slicing natural wood" as the outermost surface is also known. For example, Patent Document 1 discloses a flame-retardant nameplate decorative sheet having a butt plate, "paper or non-woven fabric", a metal foil, and another "paper or non-woven fabric" in this order from the top, and adhered between them with an adhesive layer. Furthermore, Patent Document 2 discloses a flame-retardant decorative wood sheet having, from top to bottom, a veneer of fine wood, an adhesive layer, a fibrous sheet, a thermoplastic resin layer, and another fibrous sheet.

[0006] Furthermore, Patent Document 3 discloses a flame-retardant decorative wood sheet in which a veneer of fine wood, an adhesive layer, "paper or nonwoven fabric", a flame retardant layer, a glass fiber cloth, an adhesive resin layer mixed with a flame retardant, and "paper or nonwoven fabric" are laminated and integrally pressed together.

[0007] Furthermore, Patent Document 4 discloses a flame-retardant decorative wood sheet in which a transparent resin layer, a natural wood veneer, a thermally conductive sheet, and a thermoplastic resin layer on the back are laminated and compressed from top to bottom.

[0008] Furthermore, Patent Document 5 describes a natural wood thin paper in which a backing sheet is adhered to the back of an ultra-thin natural wood veneer, the thickness of the ultra-thin veneer is reduced to 0.05 to 0.1 mm by sanding with sandpaper, and the thickness of the backing sheet is 0.03 to 0.1 mm. The construction method described in Patent Document 5 involves preparing the surface, applying a starch-based adhesive, and then attaching the natural wood thin paper.

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

[0010] However, natural wood veneer is not widely used because it is more expensive than resin veneer made of polyvinyl chloride resin, etc. Furthermore, because natural wood veneer is expensive, and in order to further enhance the sense of luxury, even if an attempt were made to mass-produce veneer with a pre-applied adhesive layer at the bottom and protected with a release sheet, the production lot would be small due to the constraints of the construction site, increasing costs; and because suitable adhesives and methods for applying them have not yet been developed, the method of applying natural wood veneer to the target surface at the construction site has been limited to the method in which workers at the construction site apply an adhesive such as starch paste to each sheet and attach it to the target surface.

[0011] In recent years, there has been a trend towards higher-quality decorative panels, but this trend has focused on upgrading the outermost layer, which is made of resin sheets such as polyvinyl chloride, rather than utilizing veneers made from sliced ​​natural wood.

[0012] Furthermore, Patent Document 7 describes a construction method in which a self-adhesive layer-attached natural wood decorative panel is manufactured by applying a self-adhesive layer-forming liquid containing a (meth)acrylic copolymer, an adhesive layer, and an organic solvent to the base material side of a reinforcing veneer having a veneer made of natural wood, an adhesive layer, and a base material, using a roll coater or curtain coater, and then forming a self-adhesive layer by distilling off the organic solvent under heating, and then sequentially attaching these to the target surface at the construction site. Furthermore, it is stated 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 of the entire self-adhesive layer, and it is also stated that the content (solid content 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 of the entire self-adhesive layer forming liquid.

[0013] In recent years, the skill level of workers has declined, and the method of attaching decorative panels to surfaces using adhesive at construction sites has resulted in inconsistent finished products, and solutions to these problems have been desired. Furthermore, with the decline in skill levels, there is a growing demand for natural wood veneer that can be attached to the target surface semi-permanently and without problems at the construction site.

[0014] In Patent Document 7, although a self-adhesive layer is formed in advance at a factory or the like, a coating solution (self-adhesive layer forming solution) in which the adhesive layer component is dissolved in a solvent is applied using a roll coater or curtain coater, and then the coating solvent is removed by distillation to form the self-adhesive layer. However, this method had several drawbacks: it was not possible to make the adhesive layer thick enough, the adhesion to the target surface at the construction site was insufficient, organic solvents (coating solvents) remained, it took a long time to completely remove the coating solvents, and the manufacturing process was complicated and costly. [Prior art documents]

Patent Document

[0015]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

Summary of the Invention

Problems to be Solved by the Invention

[0016] The present invention has been made in view of the above background art, and the problem thereof is to provide an adhesive layer-attached natural wood veneer that makes use of natural materials and can be easily and uniformly applied by an unskilled worker without variation, and a construction method using the same.

Means for Solving the Problems

[0017] As a result of intensive studies to solve the above problems, the present inventor has found that by preliminarily providing an adhesive layer having a specific composition on the side of the base material of the reinforcing battens by a specific method, the variation of each veneer on the construction surface is remarkably improved, and the cost is not increased including the construction cost at the construction site. Moreover, even an unskilled worker can easily attach the natural wood veneer uniformly because the adhesiveness of the adhesive layer is extremely high, etc., and the present invention has been completed.

[0018] That is, the present invention is a construction method in which, on the side of the base material of "a veneer obtained by slicing natural wood in order, an adhesive layer for adhering the veneer to the base material, and a reinforced veneer having the base material", a "non-carrier double-sided adhesive sheet having an adhesive layer protected by a release sheet" is adhesively bonded in advance outside the construction site to produce a "natural wood decorative board with an adhesive layer having the reinforced veneer and the adhesive layer protected by a release sheet", and at the construction site, the release sheet is peeled off, and the natural wood decorative board with an adhesive layer from which the release sheet has been peeled off is sequentially pasted onto the target surface. The adhesive layer contains a (meth)acrylate ester group A and a (meth)acrylate ester copolymer, and has a thickness of 10 μm or more and 500 μm or less. A primer is applied in advance to a target surface having a large area where two or more rectangles with a short side having a length between 1 foot (30 cm) and 10 feet (303 cm) are arranged side by side, and the natural wood decorative board with an adhesive layer is pasted thereon. The present invention provides a construction method using the natural wood decorative board with an adhesive layer.

[0019] Further, the present invention provides a construction method using the above-mentioned natural wood decorative board with an adhesive layer, in which the (meth)acrylate ester group A and / or the "(meth)acrylate ester group B constituting the (meth)acrylate ester copolymer" contains a non-polar group-containing (meth)acrylate ester and a "polar group-containing (meth)acrylate ester and / or a polyfunctional (meth)acrylate ester".

[0020] Further, the present invention provides a construction method using the above-mentioned natural wood decorative board with an adhesive layer, in which the (meth)acrylate ester group A and the (meth)acrylate ester group B are substantially the same, and the (meth)acrylate ester copolymer is obtained by photopolymerizing a part of the (meth)acrylate ester group. The present invention provides a construction method using the above-mentioned natural wood decorative board with an adhesive layer, in which the adhesive layer is formed by sandwiching an "adhesive layer-forming composition containing at least the (meth)acrylate ester group A and a photoinitiator" between the release sheet and a support sheet and irradiating with light to photopolymerize a part of the (meth)acrylate ester group.

[0021] Furthermore, the present invention provides a method for constructing a natural wood decorative 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% by mass or more and 80% by mass or less.

[0022] Furthermore, the present invention provides a method for installing a natural wood veneer with an adhesive layer, wherein the natural wood veneer has an overall thickness of 150 μm or more and 2000 μm or less.

[0023] Furthermore, the present invention provides a method for using the aforementioned adhesive-coated natural wood veneer, wherein the adhesive-coated natural wood veneer does not use phenolic resin or polyvinyl chloride resin.

[0024] Furthermore, the present invention provides a construction method using the aforementioned adhesive-coated natural wood decorative panel, where the target surface is an interior wall, exterior wall, ceiling, door, built-in furniture, partition, or furniture.

[0025] Furthermore, the present invention provides a construction method using the aforementioned adhesive-coated natural wood decorative board, which is attached to a vertically oriented or downward-facing surface without applying adhesive to either the target surface or the substrate at the construction site.

[0026] Furthermore, the present invention relates to a natural wood veneer with an adhesive layer protected by a release sheet, for use in the construction method using the aforementioned natural wood veneer with an adhesive layer, The present invention provides a natural wood decorative laminate with an adhesive layer, characterized in that an adhesive layer is attached to the side of the base material of a reinforcing veneer having a base material, which comprises, in order, a veneer made by slicing natural wood, an adhesive layer for bonding the veneer to a base material, and a reinforcing veneer having a base material, and the adhesive layer is protected by a release sheet.

[0027] Furthermore, the present invention relates to a natural wood veneer with an adhesive layer protected by a release sheet, The present invention provides a natural wood decorative laminate with an adhesive layer, characterized in that an adhesive layer is attached to the side of the base material of a reinforcing veneer having a base material, which comprises, in order, a veneer made by slicing natural wood, an adhesive layer for bonding the veneer to a base material, and a reinforcing veneer having a base material, and the adhesive layer is protected by a release sheet. [Effects of the Invention]

[0028] The adhesive-coated natural wood veneer of the present invention solves the aforementioned problems and challenges, and has a veneer that has the actual pattern (wood grain, etc.) of a natural material, made by slicing natural wood. It is a high-quality veneer that takes advantage of the excellent performance, appearance and feel of natural materials, and can be easily installed at the construction site by anyone, not just skilled workers, without burdening the workers. Compared to "printed vinyl chloride resin or other resin sheets," the adhesive-coated natural wood veneer of the present invention has a superior appearance and feel that utilizes the natural, genuine wood grain, thus possessing a high-class quality that makes the most of natural materials.

[0029] While decorative panels with a pre-applied adhesive layer are known to exist for "resin sheets such as polyvinyl chloride" and "conventional natural wood veneer," However, when applying veneer made from sliced ​​natural wood or decorative panels with veneer to a surface, the veneer is expensive, so the adhesive is applied manually on-site to maintain a high-quality appearance; the demand for decorative panels using veneer is significantly lower than that for decorative panels using "resin sheets such as polyvinyl chloride resin," and the number of units used per pattern (wood grain, etc.) is small, so mass production of "decorative panels with a pre-applied adhesive layer at the bottom" in a factory would increase the cost of the decorative panel; suitable adhesives, their film thickness, and application methods have not yet been developed; in particular, suitable application methods for flat (reinforced) veneers have not yet been developed; it is more profitable for a few companies to handle decorative panels using veneer in small lots rather than to widely distribute them; "Veneer" and "reinforced veneers made by attaching veneer to a base material" are more rigid than resin sheets, so their adhesion to the surface is inferior; for these reasons, workers at the construction site applied adhesive to each panel by hand and attached them to the surface.

[0030] Typically, decorative panels using veneers with a high bending modulus cannot be supplied in rolls and are supplied in sheets for ease of handling, etc., and their shape and size are often rectangular with one long side. Therefore, when applying adhesives such as starch paste to a surface at the construction site to attach decorative panels, it is necessary to apply the adhesive to both the back surface and the surface of each individual decorative panel in order to achieve sufficient adhesion. This places a burden on the workers and makes the work extremely time-consuming.

[0031] Moreover, whether the adhesive (sealant) is a solvent-based or organic type, such as a so-called "quick-drying bond," or a water-based type, such as a so-called "water-based bond," where the medium is water and the solute is emulsion polymerization fine particles, the adhesive must be applied to each individual decorative panel, and then the adhesive must be applied to the target surface. After this, a certain period of time (for example, about 15 to 20 minutes) must be left before the decorative panel is applied to the target surface (it must be left for this period), resulting in variations in the length of this waiting time. As a result, the degree of adhesion of the applied adhesive layer varied, and after several years from the time of installation, some rectangular decorative panels experienced problems such as edge peeling and detachment.

[0032] For example, if the adhesive described above is applied to multiple decorative panels and a large surface area at once to ensure sufficient curing time and improve work efficiency, and then the individual decorative panels are attached to the surface one by one, the adhesive strength will decrease in some panels depending on the curing time. As a result, problems such as the edges of some decorative panels peeling or some panels detaching after aging occurred after completion. Furthermore, in quick-drying adhesives, organic solvents remain even after completion, and in water-based adhesives and starch pastes, water remains. These organic solvents and water can penetrate the veneer over time and seep out onto the surface, impairing its appearance.

[0033] According to the present invention, an adhesive layer is applied to the decorative panel in advance, and since it is applied to the target surface while peeling off the release sheet, there can be no variation in the length of time the adhesive layer (adhesive layer) is left to stand. In this invention, a specific adhesive layer is applied in a specific manner, so that the tackiness (adhesion) of the surface of the adhesive layer does not decrease no matter how long it is left unattended. Therefore, it is impossible for the edges of some decorative panels to peel off or fall off.

[0034] Currently, starch paste is widely used as an adhesive for target surfaces to avoid causing allergic symptoms due to formaldehyde, etc. However, with this starch paste, in order to prioritize workability on site and save construction time, the adhesive is usually applied in a "bulk application" manner.

[0035] However, this would result in a difference in adhesive strength between the material that was coated with adhesive early and the material that was coated with adhesive later. In other words, problems would arise due to the reduced adhesiveness of the material that was coated earlier. Specifically, these defects include, for example, variations in the degree of adhesion between the decorative panels to the target surface after installation; and the peeling of some decorative panels from the target surface over many years.

[0036] However, in this invention, instead of applying adhesive to the natural wood veneer at the work site, the adhesive layer is formed in advance at the manufacturing plant, etc., and at the construction site, each sheet can be immediately attached to the target surface simply by peeling off the release sheet. Therefore, the finished product such as a wall surface to which the natural wood veneer is applied according to the present invention is less prone to peeling and other issues even after many years (over time), and there is no variation between the natural wood veneers.

[0037] Furthermore, according to the present invention, since an adhesive of a specific composition is applied by a specific method (non-carrier double-sided adhesive sheet method), a thick adhesive layer that does not lose its tackiness during construction is applied to the natural wood veneer, thus preventing the above-mentioned problems from occurring. In more detail, if the mold release sheet is removed and the material is exposed to oxygen in the air, the polymerization reaction of the radical polymerization monomer will not proceed. The remaining (meth)acrylic acid ester monomer is less likely to evaporate (volatilize), and unlike the coating solvents "organic solvents and water," it is less likely to penetrate the veneer over time and will not seep out onto the surface of the veneer and impair its appearance.

[0038] As mentioned above, in the case of starch paste, the tackiness decreases due to the evaporation of water. Similarly, in solvent-based adhesives and emulsion-type adhesives other than starch paste, the tackiness decreases due to the evaporation of the coating solvent, etc. Furthermore, in the case of curing-type adhesives, the tackiness decreases due to curing.

[0039] According to the present invention, the adhesive layer is applied to the decorative panel in advance without a solvent, and since it is applied to the target surface while peeling off the release sheet, there can be no variation in the length of time the adhesive layer (adhesive layer) is left to stand. Moreover, according to the present invention, the adhesiveness does not change regardless of the length of the material. In other words, as described above, by applying an adhesive layer of a specific material (raw material) in a specific way, the adhesiveness (adhesion) of the surface of the adhesive layer does not decrease no matter how long the waiting time is. Therefore, it is impossible for the edges of some decorative panels to peel off or fall off.

[0040] More specifically, even if time passes between peeling off the release sheet and applying the adhesive to the target surface under sunlight including visible light and ultraviolet light, the tackiness of the adhesive layer does not decrease. This is because radicals generated from the photopolymerization initiator and present at the ends of the (meth)acrylic ester are captured (quenched) by oxygen in the air, preventing radical polymerization of the (meth)acrylic groups in the adhesive layer from proceeding.

[0041] According to the method for applying a specific adhesive layer in the present invention, the thickness of the adhesive layer can be increased, and if the thickness is within a suitable range, the adhesiveness (adhesion) of the adhesive layer will not be inferior. Rather, because there is no unevenness in the adhesion of each individual decorative laminate sheet, problems such as peeling will not occur in (some) of the decorative laminate sheets over time. In the installation of decorative panels, if peeling, edge curling, or seepage of coating solvents such as water occurs over time, even in a small portion (one panel), it can become a liability issue for the entire installation. When the adhesive-coated natural wood decorative panel of the present invention is applied to a surface, there is absolutely no variation in the adhesiveness of each individual panel to the surface. Considering all these factors, it is extremely superior in terms of both long-term stability and cost-effectiveness.

[0042] The following specific figures are approximate and examples only, and the scope of the present invention is not limited thereto. Specifically, for example, even if the cost of decorative panels is about 1.5 to 2 times higher when using the present invention's method of "using veneer with a pre-applied adhesive layer" compared to "a case where veneer is supplied simply attached to a base material and workers apply adhesive to the decorative panels on-site," the area of ​​the target surface that can be worked on in a day is about 2.5 to 3.5 times larger, so the labor cost for workers is 1m 2The cost per unit becomes approximately 0.7 to 0.8 times lower, and the total cost actually decreases.

[0043] In this invention, since the adhesive layer is applied using a "non-carrier double-sided adhesive sheet having an adhesive layer protected by a release sheet" at a factory or the like, a thicker and more tackier adhesive layer can be applied compared to "applying the adhesive layer" using other coaters such as curtain coaters, roll coaters, and screen printing machines. Therefore, even at the construction site (even by inexperienced workers), it is possible to firmly adhere the sheets to the target surface without causing variations in each specific rectangular natural wood veneer. Therefore, even after many years, peeling of the veneer is less likely to occur, variations between natural wood veneers do not occur, and because no solvents are used, stains do not seep onto the veneer surface.

[0044] Furthermore, the adhesive-coated natural wood veneer in this invention does not have the characteristic odor of synthetic resins, and does not use phenolic resin containing formaldehyde, vinyl chloride resin, or aromatic ring-containing solvents such as toluene, so there is no risk of hazards from volatile gases or concerns about various allergies. Furthermore, since the decorative panels do not use general-purpose polyvinyl chloride resin, no harmful substances are generated when they are incinerated for disposal.

[0045] Furthermore, since there is no need to use adhesives at the construction site, there are no problems with workers or the surrounding environment caused by the organic solvents contained in the adhesive. Furthermore, since no coating solvent is used to impart the adhesive layer, even outside the construction site, such as at the manufacturing plant of the adhesive-coated natural wood veneer, there is no possibility of coating solvent being contained in the adhesive-coated natural wood veneer according to the present invention.

[0046] Even when natural wood veneer panels with an adhesive layer are manufactured outside of construction sites such as factories, conventionally, a coating solution containing dissolved adhesive layer components (adhesive layer forming solution) is applied using a roll coater or curtain coater, and then the organic solvent (coating solvent) is removed by distillation to form a self-adhesive layer. However, this method had several drawbacks: it was not possible to make the adhesive layer thick enough, the adhesion to the target surface at the construction site was insufficient, it lacked stability over time, organic solvents (coating solvents) remained, and there was seepage onto the veneer surface. Furthermore, the manufacturing process was complicated and costly.

[0047] In other words, in this invention, the adhesive layer is applied using a non-carrier double-sided adhesive sheet, so it is not necessary to use an organic solvent, such as a coating solvent, not only at the construction site but also outside the construction site (e.g., at a decorative panel manufacturing plant). Therefore, problems caused by solvents to workers or the surrounding environment cannot occur, and the aforementioned problems cannot arise.

[0048] According to the present invention, installation can be performed even by inexperienced workers, there is no need to worry about the waiting time (after adhesive application) during application, and the construction costs at the construction site can be significantly reduced compared to conventional methods. Furthermore, even after many years have passed since installation, the "conventional problems" such as "one or a few sheets peeling off the surface due to poor adhesion" do not occur, and the entire surface becomes uniform, exhibiting extremely excellent long-term stability. [Brief explanation of the drawing]

[0049] [Figure 1] This is a schematic cross-sectional view showing the essential layer configuration for the "natural wood veneer with adhesive layer protected by a release sheet" used in the construction method of the present invention. [Figure 2] This is a schematic flowchart illustrating the process of manufacturing the "natural wood veneer with adhesive layer protected by a release sheet" according to the present invention using a non-carrier double-sided adhesive sheet. In other words, this is a schematic flowchart illustrating the process of applying the adhesive layer to the natural wood veneer with adhesive layer according to the present invention using a non-carrier double-sided adhesive sheet. [Figure 3] This is a schematic cross-sectional view after an adhesive-coated natural wood veneer has been attached to an object using the "construction method using an adhesive-coated natural wood veneer" of the present invention. [Modes for carrying out the invention]

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

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

[0052] In other words, the adhesive-layered natural wood decorative board 1 used in the construction method of the present invention, for example, as shown in the schematic cross-sectional view in Figure 1, comprises a veneer 3 made by slicing natural wood, an adhesive layer 4 for bonding the veneer 3 to a base material 5, a base material 5, and an adhesive layer 6 containing (meth)acrylic acid ester group A and (meth)acrylic acid ester copolymer, which are laminated in this order. The reinforcing veneer 2 is made by bonding the veneer 3 to the base material 5 with the adhesive layer 4.

[0053] The adhesive layer 6 of the natural wood veneer 1 with adhesive layer is protected by the 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, "natural wood decorative panel with adhesive layer used in the construction method of the present invention" may be simply abbreviated as "decorative panel of the present invention." Since the adhesive layer 6 of "decorative panel 1 of the present invention" is protected by a release sheet 7, "decorative panel 1 of the present invention" is protected by the release sheet 7 (see Figure 1).

[0054] <Reinforcement veneer> The decorative panel 1 of the present invention has a reinforcing veneer 2 and an adhesive layer 6, and the reinforcing veneer 2 comprises a veneer 3, an adhesive layer 4 for bonding the veneer 3 to a base material 5, and the base material 5 in this order.

[0055] <<Veneer>> "Veneer" refers to a board made by thinly slicing natural wood. A veneer with a beautiful wood grain is preferred as the decorative board 1 of this invention. A known method can be used for manufacturing the veneer 3, and if necessary, it is heated in the presence of water or steam and then cut with a slicer or the like. Furthermore, the veneer 3 obtained by cutting can be thinned or smoothed by sanding or other means, or by bringing out the fine irregularities and woody texture of natural wood. The surface can also be protected with resin or the like.

[0056] There are no particular restrictions on the raw wood used for veneer 3, but examples include zelkova, oak, Manchurian ash, Japanese ash, cherry, paulownia, cypress, cedar, pine, mahogany, walnut, oak, teak, bamboo, maple, eucalyptus, pine, rosewood, horse chestnut, beech, black oak, Japanese ash, 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, it may easily peel off at the adhesive layer 4 between the veneer 3 and the base material 5, or at the adhesive layer 6 between the base material 5 and the target surface, resulting in the waste of expensive veneer 3. If it is too thin, the veneer 3 may crack, become difficult to slice, or lose its high-quality appearance.

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

[0059] The method for obtaining a reinforcing veneer 2 by bonding the veneer 3 to the base material 5 is preferably carried out by interposing an adhesive between the veneer 3 and the base material 5 and applying pressure. Hot-press bonding is particularly preferred. In the decorative panel 1 of the present invention, the veneer 3, adhesive layer 4, base material 5, and adhesive layer 6 are essential, but this does not exclude the existence of other "other layers". If such "other layers" exist, it is also preferable to interpose an adhesive between them and simultaneously (heat and pressure) bond all the plate-like materials, including the veneer 3 and base material 5.

[0060] <<Base material>> Examples of base material 5 include paper, nonwoven fabric, woven fabric, metal foil, wood board, resin-impregnated paper, resin film, laminate film, etc. Functionality may be enhanced by adding functional agents such as fillers, dyes and pigments, flame retardants, fire retardants, preservatives, and chelating agents to these materials. In particular, paper or nonwoven fabric is preferred as the base material 5 because it has high strength, flexibility, is easy to process, is inexpensive, is easy to impregnate and incorporate the above-mentioned functional additives, has high conformability, and has high breathability, and paper is especially preferred for the same reasons as above.

[0061] The thickness of the base material 5 is not particularly limited, but it is preferably 1 / 20 to 1 / 2 of the thickness of the veneer 3 to be bonded thereto, more preferably 1 / 10 to 1 / 3, and particularly preferably 1 / 7 to 1 / 3.5. Specifically, a thickness of 15 μm to 1000 μm is preferred, 20 μm to 300 μm is more preferred, and 25 μm to 100 μm is particularly preferred. Furthermore, if the base material 5 is paper or nonwoven fabric, its basis weight is 10 to 100 g / m². 2 Preferably, it is 20-50 g / m 2Those are particularly preferable.

[0062] If the thickness or basis weight of the base material 5 is too small, it may result in insufficient strength as a reinforcing veneer 2 or decorative panel 1, difficulty in applying (laminating) the adhesive layer 6, the effects of substances and volatile materials from the adhesive layer 6 on the veneer 3, and difficulties in manufacturing and handling. On the other hand, if the thickness or basis weight of the base material 5 is too large, the adhesive layer 4 between the veneer 3 and the base material 5, or the adhesive layer 6 between the base material 5 and the target surface, may peel off, resulting in wasted thickness.

[0063] <Adhesive layer> The adhesive layer 6 is a layer that has adhesive properties and is provided for attaching the reinforcing veneer 2 to the object T. It is preferable that the adhesive properties do not substantially decrease over time, from the manufacturing of the decorative panel 1 in a factory to its installation (use) on site, but this can be achieved by the adhesive layer composition and adhesive layer formation method described later.

[0064] As mentioned above, conventionally, workers typically apply adhesive to both multiple decorative panels with veneers 3 and the corresponding large surface area of ​​the surface, then allow sufficient drying time before attaching the multiple decorative panels 1. However, this results in varying drying times for each decorative panel 1, and the degree of adhesive strength differs for each decorative panel 1 (and for each location on the surface). As a result, after several years, some decorative panels 1 (mostly those to which adhesive was applied first and left for a longer time) experience problems such as edge peeling and detachment.

[0065] In the decorative panel 1 of the present invention, by using a specific adhesive layer 6 described later and adhering the adhesive layer 6 to the base material side of the reinforcing veneer 2 in a specific manner described later at a factory or the like, workers do not need to apply or attach adhesive at the construction site. Instead, the adhesive can be applied to the target surface by peeling off the release sheet 7, and there can be no variation in the length of time the adhesive layer 6 is left to stand. Furthermore, by using an adhesive layer 6 with a specific composition described later, the tackiness (adhesion) of the surface of the adhesive layer 6 does not decrease no matter how long it is left unattended at the construction site. As a result, the tackiness of all decorative sheets becomes uniform, and peeling or detachment of some decorative panels 1 does not occur.

[0066] <<Method for applying an adhesive layer>> In the construction 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 attached to the base material 5 side of the reinforcing veneer 2 in advance outside the construction site, thereby manufacturing a natural wood decorative board 1 with an adhesive layer protected by a release sheet 7 (see Figure 2).

[0067] The present invention is also an adhesive-coated natural wood veneer 1 in which the adhesive layer 6 is protected by a release sheet 7, and in which, "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", the "non-carrier double-sided adhesive sheet 9 having the adhesive layer 6 and a release sheet 7" is adhered to the side of the base material 5 (see Figures 1 and 2). The present invention also relates to a natural wood veneer 1 with an adhesive layer, in which the adhesive layer 6 is protected by a release sheet 7, and this "veneer protected by a release sheet 7" may be the subject of sale or transfer.

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

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

[0070] Among the (meth)acrylic acid ester group contained in the raw materials for forming the adhesive layer, those polymerized by photopolymerization or thermal polymerization as described below are called "(meth)acrylic acid ester copolymers," while those that remain as monomers without polymerization are called "(meth)acrylic acid ester group A." Therefore, if we define the copolymer units constituting the (meth)acrylic acid ester copolymer as "(meth)acrylic acid ester group B," then "(meth)acrylic acid ester group B constituting the copolymer" and "(meth)acrylic acid ester group A in its unpolymerized state" are the same (one set) "adhesive layer forming composition" before polymerization (at the starting point). Thus, although it depends on the copolymerizability (Q value, e value) of each monomer in copolymerization, the component names are almost identical and the component ratios are similar.

[0071] The unpolymerized "(meth)acrylic acid ester group A," together with tackifying compounds, provides suitable tackiness to the adhesive layer 6.

[0072] Since the adhesive layer 6 contains at least (meth)acrylic acid ester group A and (meth)acrylic acid ester copolymers, it may contain other polymerizable monomers (copolymer components) such as styrene, (meth)acrylamide, and vinyl acetate; copolymers thereof; and non-polymerizable "other components," as described later.

[0073] If the adhesive layer 6 is one of the above, (specifically) one described below, it has the following effects: stable performance from factory manufacturing to application at the construction site, easy adhesion of the decorative panel 1 of the present invention to the surface of the object T, good stability over time after application, easy adjustment of storage modulus and peel adhesive strength to a desired range, easy adjustment of gel fraction, easy adjustment of glass transition temperature (Tg), can be made solvent-free, no allergy problems, and unpolymerized (meth)acrylic acid ester group A does not cause staining by seeping into the veneer.

[0074] In the construction method of the present invention, it is preferable from the viewpoint of worker and consumer safety, environmental characteristics, etc., that the adhesive-coated natural wood veneer 1 is one of those described later and does not use phenolic resin or polyvinyl chloride resin.

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

[0076] As shown in Figure 2(b), the adhesive layer 6 can be obtained by irradiating a "sticky layer forming composition" containing (meth)acrylic acid ester, as described later, with light to polymerize it. The "adhesive layer forming composition" may, in addition to the (meth)acrylic acid ester described below, optionally contain at least one of the following: "polymerizable monomers other than (meth)acrylic acid esters," polymerization initiators such as photoradical polymerization initiators, tackifying compounds, fine particles, and / or "other components."

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

[0078] Subsequently, the "adhesive layer forming composition" is applied onto the support sheet 8 or the release sheet 7, and then the other release sheet 7 or support sheet 8 (the sheet names are in the same order) is applied to the coated surface (covering the coated surface) mainly to prevent oxygen from the air from entering and diffusing into the coating film (see Figure 2(a)). Next, light is irradiated or heat is applied from the side of the release sheet 7 and / or support sheet 8 to polymerize a portion of it, thereby obtaining an adhesive layer 6 containing at least a (meth)acrylic acid ester copolymer and unpolymerized (meth)acrylic acid ester group A (see Figure 2(b)). Figure 2(b) shows an example where light is irradiated from the side of the support sheet 8 to photopolymerize a portion of the (meth)acrylic acid ester group, but light may also be irradiated from the side of the release sheet 7.

[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 factors such as the presence and type of photopolymerization initiator, the coating film thickness, and the light intensity (energy irradiated per unit time), but is generally between 0.1 and 100 mW / cm². 2 It is preferable.

[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 Figure 2(c)). Furthermore, since the release sheet 7 remains in place until the time of installation, in other words, the part that remains until the time of installation is defined as the release sheet, and the part that peels off at this stage is the "support sheet 8".

[0081] As described above, the adhesive layer 6 of the adhesive-coated natural wood veneer 1 in the present invention is preferably formed by sandwiching an adhesive layer-forming composition containing at least a group of (meth)acrylic acid esters 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 group of (meth)acrylic acid esters. When a portion 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 polymerized (meth)acrylic acid ester copolymer, as determined by gel permeation glometry (GPC), is preferably between 50,000 and 5,000,000, more preferably between 100,000 and 2,000,000, and particularly preferably between 150,000 and 1,000,000. Within this range, the adhesive strength when attaching the decorative panel 1 to the target surface and the long-term stability after adhesion (such as the absence of edge curling and peeling) can be increased and maintained.

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

[0084] By setting the gel fraction within the above range, it becomes easier to set the cohesive force and storage modulus of the adhesive layer 6 to a suitable range, and 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 preferably enhances the adhesiveness. The gel fraction can also be adjusted within the above-mentioned range by adjusting the amount of the following "(1-3) polyfunctional (meth)acrylic acid ester" etc.

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

[0086] The glass transition temperature (Tg) of the adhesive layer is preferably -40°C to 10°C, more preferably -35°C to 0°C, and particularly preferably -30°C to -10°C. Having the Tg of the adhesive layer within this temperature range improves the low-temperature adhesion properties of the double-sided adhesive tape. The glass transition temperature is measured using a general-purpose dynamic viscoelastic 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 polymerization reactions induced by light irradiation, contains (1) (meth)acrylic acid ester as an essential component, but also contains other components. (2) Polymerizable monomers other than (meth)acrylic acid esters, (3) Polymerization initiators such as photoradical polymerization initiators, (4) a tackifying compound; (5) fine particles; and / or, (6) Other ingredients It is desirable that the mixture contains preferably one, more preferably two, even more preferably three, and particularly preferably four types.

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

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

[0090] <<<<(1-1) Polar group-free (meth)acrylic acid ester>>>> (1-1) There are no particular limitations on the polar group-free (meth)acrylic acid esters, but alkyl esters, aryl esters, aralkyl (aralkyl) esters, etc., with 1 to 22 carbon atoms are preferred. For all three types of esters, the number of carbon atoms is more preferably 18 or less, even more preferably 16 or less, particularly preferably 2 to 12, and most preferably 4 to 8. It is desirable that the "(1-1) polar group-free (meth)acrylic acid ester" contains a group having a number of carbon atoms within the above range.

[0091] By including materials within the above range, it becomes easier to adjust the glass transition temperature of the (meth)acrylic acid ester copolymer in the adhesive layer 6 to a desired range. In other words, it becomes a preferred material for (meth)acrylic acid ester group B. Unreacted (unpolymerized) "(meth)acrylic acid ester group A" is also preferable.

[0092] 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, behenyl (meth)acrylate, and the like. These can be used individually or in combination of two or more types.

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

[0094] Examples of aryl esters include phenyl (meth)acrylate, tolyl (meth)acrylate, and xyl (meth)acrylate.

[0095] Examples of aralkyl esters include, for instance, benzyl (meth)acrylate.

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

[0097] <<<<(1-2) Polar group-containing (meth)acrylic acid esters>>>> (1-2) There are no particular limitations on the polar group-containing (meth)acrylic acid ester, but examples of such polar groups include dialkylamino groups, alkylarylamino groups, diarylamino groups, hydroxyl groups, alkylylyl groups, carboxyl groups, ethylene glycol residues (-CH2CH2O-), propylene glycol residues, diethylene glycol residues, dipropylene glycol residues, triethylene glycol residues, tripropylene glycol residues, furfuryl groups, glycidyl groups, etc.

[0098] Furthermore, other examples include groups in which an alkylene group is bonded to the polar groups mentioned above, such as 2-carboxyethyl group, hydroxyethyl group, dialkylaminoethyl group, alkylarylaminoethyl group, and diarylaminoethyl group. Other 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] Specifically, examples include dimethylaminoethyl (meth)acrylate, 2-carboxyethyl (β-carboxyethyl (meth)acrylate), 2-hydroxyethyl (HE(M)A) (meth)acrylate, and hydroxyethoxyethyl (meth)acrylate.

[0100] (1-2) The content of polar group-containing (meth)acrylic acid esters is preferably 2% by mass or more and 25% by mass or less, more preferably 4% by mass or more and 20% by mass or less, and particularly preferably 6% by mass or more and 15% by mass or less, based on the total amount of the adhesive layer 6. By including the above range, it becomes easier to obtain an adhesive layer 6 that achieves both low-temperature adhesion and high-temperature adhesion (holding power). For example, even if the decorative panel 1 is attached in winter and time passes until summer, displacement and falling can be prevented.

[0101] <<<<(1-3) Polyfunctional (meth)acrylic acid esters>>>> (1-3) Polyfunctional (meth)acrylic acid esters are not particularly limited as long as they have two or more (meth)acrylic groups in one molecule and can be crosslinked, but specifically, for example, 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, Examples include roxylated trimethylolpropane tri(meth)acrylate, pro-substituted glyceryl tri(meth)acrylate, neopentyl glycol adipate di(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolpropane di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, polybutadiene having (meth)acryloyl groups at both ends or its hydrogenated products.

[0102] (1-3) The total amount of polyfunctional (meth)acrylic acid esters is preferably 0.01% to 16% by mass, more preferably 0.10% to 13% by mass, and particularly preferably 0.2% to 10% by mass, relative to the entire adhesive layer 6. By including the above range, it becomes easier to obtain an adhesive layer 6 that achieves both low-temperature adhesion and high-temperature adhesion (holding power). For example, even if the decorative panel 1 is attached in winter and time passes until summer, displacement and falling can be prevented.

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

[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)acrylamide, (meth)acrylamide, styrene, divinylbenzene, α-methylstyrene, o-methylstyrene, p-methylstyrene, (anhydride) maleic acid, vinyl alkyl ether, vinyl acetate, allyl compounds, esters of (meth)acrylic acid with an "alcohol having an amide group", esters of (meth)acrylic acid with hydroxyethylethyleneurea ((meth)acrylic acid ester ethylethyleneurea), (poly)butadiene, (poly)ethylene, or (poly)ethylene, or a partially hydrogenated version thereof, which may or may not have a (meth)acryloyl group at one end.

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

[0106] <<<(3) Polymerization initiators such as photoradical polymerization initiators>>> (3) Polymerization initiators such as photoradical polymerization initiators are not particularly limited as long as they generate radicals (initiation) using energy such as visible light, ultraviolet light, electron beams, or heat, and radically polymerize (propagate) the double bonds of (meth)acrylic acid esters. Preferably, the photoradical polymerization initiator is used, and more preferably, a visible light or ultraviolet light radical polymerization initiator, as it allows for a clear determination of the polymerization initiation point. Another method involves initiating the polymerization process in the presence of a spectral sensitizer.

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

[0108] <<<(4) Tackifying compound>>> The tackifying compound is not particularly limited as long as it is a compound that is contained in the adhesive layer 6 and imparts tackiness. The molecular weight of the tackifying compound is not particularly limited, but it is preferable that it be a tackifying resin rather than a tackifying monomer.

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

[0110] Specifically, examples include polyurethanes containing urethane oligomers; epoxy resins containing epoxy oligomers; polyesters containing low molecular weight polyesters; rosin-based resins such as hydrogenated rosin, rosin esters, and disproportionated rosin; terpene-based resins such as hydrogenated terpenes and terpenes; petroleum-based resins such as hydrogenated petroleum resins and petroleum resins; xylene-based resins such as hydrogenated xylene resins and xylene resins; and so on.

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

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

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

[0114] Examples of such fine particles include inorganic hollow particles such as glass balloons, shirasu balloons, and fly ash balloons; organic hollow particles such as alkyl poly(meth)acrylates, 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 alkyl poly(meth)acrylates, polyurethane, polyethylene, and polypropylene.

[0115] When the fine particles are included, 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 "other components" include plasticizers, lubricants, flame retardants, fire retardants, softeners, coloring pigments, dyes, and preservatives.

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

[0118] If the adhesive layer 6 is too thin, it may become difficult to manufacture the decorative panel 1, it may peel off easily between the base material 5 and the target surface, it may peel off easily over time, and the initial adhesion may be poor. On the other hand, if the adhesive layer is too thick, it becomes easier for the decorative panel 1 to separate (dissociate) within the adhesive layer 6, which can lead to the decorative panel 1 peeling off between the base material 5 and the target surface, deterioration of the adhesive layer 6, or wasting the adhesive layer 6.

[0119] In the present invention's "method for forming a release layer," that is, the method of pre-attaching a "non-carrier double-sided adhesive sheet 9 having an adhesive layer 6 protected by a release sheet 7" outside the construction site to form an adhesive layer 6 on the decorative panel 1 protected by the release sheet 7, the effects described above or below can be obtained. In particular, a thick adhesive layer 6 suitable (matched) to the construction method of the present invention can be stably formed. Curtain coaters, roll coaters, screen printing machines, spray coating machines, etc., cannot reliably prepare a thick adhesive layer 6.

[0120] <Release sheet, support sheet> The aforementioned "material for the adhesive layer" is applied onto the support sheet 8 or the release sheet 7, and then the other release sheet 7 or support sheet 8 is applied to its applied surface. The "material for the adhesive layer" is preferably exposed to light (irradiated with light) over its entire surface, causing a portion of it to polymerize and the adhesive layer 6 to be completed (Figure 2(a)(b)). Subsequently, the support sheet 8 is 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)), and this is adhered to the base material side of the reinforcing veneer 2 to manufacture the adhesive-coated natural wood veneer 1 (Figure 2(d)). The "non-carrier double-sided adhesive sheet 9" in this invention is sometimes also called "non-support tape" or "double-sided adhesive tape."

[0121] The materials of the release sheet 7 and the support sheet 8 are not particularly limited and may be resin (polymer), woven fabric, nonwoven fabric, paper, metal, etc. However, when the adhesive layer 6 is manufactured by exposure (light irradiation), the material of the sheet on the side that is irradiated with light is preferably colorless and transparent in order to eliminate light absorption. Furthermore, when radical polymerization is carried out, a gas barrier material is preferable in order to suppress the intrusion and diffusion of oxygen from the air into the "material for the adhesive layer".

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

[0123] It is preferable that the release sheet 7 and the support sheet 8 have a release treatment applied to the side that comes into contact with the "raw material for the adhesive layer" (the coated surface, the surface that comes into contact with the adhesive layer 6) in order to improve the peelability from the adhesive layer 6.

[0124] [Installation method using the adhesive-coated natural wood veneer of the present invention] <Size, shape, etc. of natural wood veneer with adhesive layer (the veneer of the present invention)> In the present invention, the shape and size of the decorative panel 1 are preferably in the form of a sheet rather than a roll, and it is preferable that at least one side of the panel is rectangular in shape with dimensions of 1 shaku (30 cm) or more and 10 shaku (303 cm) or less. In the construction method of the present invention, the decorative panels 1 are attached to a large surface area consisting of two or more rectangles, each with a shorter side length of "between 1 shaku (30 cm) and 10 shaku (303 cm)." For this purpose, it is preferable that the decorative panels 1 have the size within the above range, and it is particularly preferable that both sides are between 1 shaku (30 cm) and 10 shaku (303 cm). Within this range, it can be suitably applied to (attached to) large surface areas, and has effects such as being less prone to cracking in the veneer 3 and improving on-site workability.

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

[0126] If the thickness of the decorative panel 1 is too thin, the same problems as when the thickness of the veneer 3 or each layer is too thin may occur, and in particular, the adhesiveness to the target surface and the long-term stability of the adhesive may decrease. According to the "method for applying adhesive to the reinforcing veneer 2" in the present invention, a thick adhesive layer 6 like the one described above can be suitably formed. On the other hand, if it is too thick, the same problems as when the veneer 3 or each layer is too thick are likely to occur.

[0127] <Construction method, construction location, target surface, etc.> The construction method of the present invention involves first attaching a non-carrier double-sided adhesive sheet 9 to a reinforcing veneer 2 outside the construction site to produce a "decorative panel 1 protected by a release sheet 7," and then, at the construction site, peeling off the release sheet 7 and sequentially attaching the decorative panels 1 from which the release sheet 7 has been peeled to the target surface of the target object T. Unlike conventional methods, there is no need to apply adhesive to both the decorative panel 1 and the target surface at the construction site, nor is there any need to be concerned about the time between applying the adhesive and attaching the panel. A larger decorative panel 1 may be cut on-site to match the size of the target surface. Alternatively, a primer may be applied to the target surface of the object T beforehand. A known primer can be used.

[0128] There are no particular limitations on the object T (building, etc.) to which the stickers can be applied, but examples include halls, elevators, rooms, corridors, ceilings, doors, built-in furniture, partitions, or furniture in halls, elevators, rooms, corridors, and other spaces in public halls, art museums, music / lecture / sports venues, community centers, commercial buildings, residential buildings, etc. Attaching them to these nearly vertical surfaces is particularly preferable because it allows the natural wood grain to be clearly visible and the impact is less than that of the floor.

[0129] In particular, applying the adhesive to large surface areas such as interior walls, exterior walls, and ceilings is preferable because it more easily achieves the effects of the present invention, such as "there is no need to apply adhesive to both the decorative panel 1 and the surface at the construction site" and "there is no need to be concerned about the time between adhesive application and attachment at the construction site." Specifically, it is preferable to apply the invention to a large area where two or more rectangles, preferably three or more, more preferably five or more, even more preferably ten or more, and especially preferably fifteen or more, are arranged vertically or horizontally, as this makes it easier to achieve the aforementioned effects of the invention.

[0130] The present invention also relates to a construction method using decorative panels, in which the "natural wood decorative panel with adhesive layer 1" is attached to a "vertically located target surface (see Figure 3) or a target surface that is facing downwards" without applying adhesive to either the target surface or the base material 5 at the construction site. According to the construction method of the present invention using the decorative panels described above, the adhesiveness is strong, the stability of the adhesiveness over time is good, and there is no difference (cannot occur) in the adhesiveness of each decorative panel. Therefore, it is suitable for use on "target surfaces that face downwards," such as ceilings.

[0131] <Natural wood veneer with adhesive layer protected by release sheet> The present invention is the adhesive-coated natural wood veneer 1 described above, and more preferably, the adhesive-coated natural wood veneer 1 used in the construction method of the present invention. In other words, the present invention is a natural wood veneer 1 with an adhesive layer protected by a release sheet 7, for use in the "construction method using natural wood veneer with an adhesive layer" described above, It is also a natural wood decorative panel 1 with an adhesive layer, characterized in that an adhesive layer 6 and a release sheet 7 are attached to the side of the base material 5 of a reinforcing veneer 2 having the base material 5, in the order of "a veneer 3 made by slicing natural wood, an adhesive layer 4 for bonding the veneer 3 to a base material 5, and an adhesive sheet 9 having an adhesive layer 6 and a release sheet 7", the adhesive layer 6 being protected by the release sheet 7. [Examples]

[0132] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples unless it exceeds the essence of the invention.

[0133] Manufacturing Example 1 <Manufacturing of reinforcing veneers> A brown-colored backing paper with a thickness of 30 μm was used as the base material 5, and a veneer 3 made from zelkova wood, sliced ​​to a thickness of 350 μm (0.35 mm), was bonded to its surface to obtain a reinforcing veneer 2 (see Figure 1). Its dimensions were a rectangle measuring 1 shaku (30 cm) by 3 shaku (91 cm).

[0134] Manufacturing Example 2 <Manufacturing of "Non-carrier double-sided adhesive sheet with adhesive layer" protected by a release sheet - 1> The adhesive layer raw material composition was prepared by blending and mixing the following adhesive layer raw materials at the manufacturing plant, rather than at the construction site.

[0135] Classification, Name of raw material substance, Mixing ratio 1-1 2-Ethylhexylacrylate 65 parts by mass 1-1 n-butyl acrylate 10.0 parts by mass 1-3 Trimethylolpropane triacrylate 1.00 parts by mass 2. Acrylic acid 5.0 parts by mass 2 Hydrogenated polybutadiene having a methacryloyl group at one end: 5.0 parts by mass 4. Hydrogenated petroleum resin (softening point 100°C and 140°C) 12.0 parts by mass 5. Glass powder 0.50 parts by mass 3. Michler ketone 0.50 parts by mass

[0136] A spacer with a thickness of 0.3 mm (300 μm) was placed on the release surface of the support sheet 8, and the above-mentioned adhesive layer raw material composition was applied to a thickness of 300 μm. Next, a release sheet 7 was placed over the above-mentioned coating so that the release surface was in contact with the coating (Figure 2(a)). For the support sheet 8 and the release sheet 7, a PET film (50 μm thick) treated with silicone release agent was used.

[0137] In this state, the irradiation intensity is 5 mW / cm² from the release sheet 7 side. 2 Then, ultraviolet and visible light were irradiated from a chemical lamp for 15 minutes (see Figure 2(b) (however, the irradiated side is reversed)) to obtain an "adhesive layer 6 (i.e., a non-carrier double-sided adhesive sheet 9)" sandwiched between the support sheet 8 and the release sheet 7 (Figure 2(b)).

[0138] The gel fraction of the obtained adhesive layer 6 was 45% by mass, and the glass transition temperature (Tg) of the adhesive layer 6 was -20°C.

[0139] Manufacturing Example 3 <Manufacturing of natural wood veneer with adhesive layer protected by release sheet - 1> Next, the support sheet 8 was peeled off from the material obtained in Manufacturing Example 2 and adhered (bonded) to the base material 5 of the reinforcing veneer 2 obtained in Manufacturing Example 1 to obtain a natural wood veneer 1 with an adhesive layer protected by a release sheet 7 (Figures 1 and 2(d)). The resulting product will be called "Decorative Panel A".

[0140] Manufacturing Example 4 <Manufacturing of "Non-carrier double-sided adhesive sheets with an adhesive layer" protected by a release sheet - 2> In Production Example 2, the adhesive layer raw material composition was prepared in the same manner as in Production Example 2, except that the composition of the adhesive layer raw material was changed as follows.

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

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

[0143] The gel fraction of the obtained adhesive layer 6 was 55% by mass, and the glass transition temperature (Tg) of the adhesive layer 6 was -30°C.

[0144] Manufacturing Example 5 <Manufacturing of natural wood veneer with adhesive layer protected by release sheet - 2> From the material obtained in Manufacturing Example 4, the support sheet 8 was peeled off and adhered (bonded) to the base material 5 side of the reinforcing veneer 2 obtained in Manufacturing Example 1, thereby obtaining a natural wood decorative board 1 with an adhesive layer protected by a release sheet 7 (Figures 1 and 2(d)). The resulting product is referred to as "Decorative Panel B".

[0145] Example 1 <On-site construction and evaluation of adhesion to the target surface and stability over time> The rectangular decorative panels A and B, measuring 1 shaku (30 cm) x 3 shaku (91 cm) as described above, were cut as needed near the edges to form approximately 10m lengths. 2 They were each attached to the entire surface of the target surface, which is the vertical plane. A general-purpose primer was applied to the target surface beforehand. The worker peeled off each release sheet 7 in front of the object T, and immediately after peeling off the release sheet 7, applied it to the object surface.

[0146] Approximately 10m 2 The time required to apply the material to the entire surface of the target area was approximately 1 hour for both decorative panel A and decorative panel B. All decorative panels 1 were successfully applied, and there was no peeling at the edges. Furthermore, no peeling occurred on any of the decorative panels 1, neither with decorative panel A nor decorative panel B, even over time. In addition, no solvent or water stains appeared on the decorative panels over time.

[0147] Comparative Example 1 <On-site application using quick-drying adhesive, and evaluation of adhesion to the target surface and long-term stability> We observed a reinforcing veneer 2, similar to the one obtained in Manufacturing Example 1, used as a decorative panel. Ten years ago, workers on-site applied adhesive to both the reinforcing veneer (decorative panel) and the target surface, and then attached 10 panels vertically and 20 panels horizontally to the same target surface. The object T is the interior wall of the public hall, and its material is the same as that of Example 1, except for its larger surface area.

[0148] An organic solvent-based adhesive, commonly known as a "quick-drying bond," was used to group the target surfaces. The adhesive was then applied to the entire surface of the reinforcing veneer (decorative panel) and the corresponding target surface. For each group, there was a 0.5-hour difference in the setting time between the first and last application. Furthermore, after allowing 15 minutes to set after the adhesive had been applied to all the reinforcing veneers (decorative panels) and the target surface, each reinforcing veneer (decorative panel) was attached to the target surface from left to right.

[0149] In Comparative Example 1, the area of ​​the surface to which the decorative panel was attached was much larger than the area of ​​the surface in Example 1. However, based on experience, when the same area is to be covered, Comparative Example 1 can only be covered in about 1 / 3 of the area per day (i.e., per unit of time) compared to Example 1.

[0150] Upon examining the surface that was constructed 10 years ago, as described above, delamination was observed in the reinforcing veneer (decorative panel) on the right half. The ideal waiting time between adhesive application and bonding is 15 to 20 minutes. However, applying the adhesive all at once took longer, and after the adhesive had been left to set for the specified time, the reinforcing veneers (decorative panels) were attached to the surface from left to right. As a result, the waiting time after adhesive application was longer on the right side compared to the left side, which likely led to reduced adhesion and subsequent peeling of that section after 10 years. It should be noted that even if only one panel peels off, the entire construction is considered defective.

[0151] Comparative Example 2 <On-site application using water-based adhesive, and evaluation of adhesion to the target surface and long-term stability> When a so-called "water-based adhesive" (latex-based adhesive) whose medium is water and whose solute is emulsion polymerization fine particles was used instead of the organic solvent-soluble adhesive (solvent-based / organic) known as "quick-drying bond" used in Comparative Example 1, and the application was carried out in the same manner as in Comparative Example 1, the results were the same as in Comparative Example 1. In other words, while the ideal "standing time from adhesive application to bonding" is 15 to 20 minutes, the standing time was longer than that, and the standing times varied. As a result, the adhesive properties of all adhesives decreased similarly over time, and the results after 10 years were the same as in Comparative Example 1.

[0152] Comparative Example 3 <Summary: Comparison and evaluation of construction and work time at sites without adhesive application> In Comparative Examples 1 and 2, instead of the method used, which involved applying adhesive to multiple reinforcing veneers (decorative panels) in groups and then attaching them all together after a certain period of time, it was anticipated that applying adhesive to each panel individually and then attaching them to the surface one by one after a predetermined period of time (usually 15 to 20 minutes) would require even more working time. In Comparative Examples 1 and 2, only about 1 / 3 of the work could be completed per day (i.e., per unit time) compared to Example 1, which was converted to the same area. However, the method in Comparative Example 3 was even less efficient, processing less than 1 / 10 of the work done in Example 1, making it impractical.

[0153] Comparative Manufacturing Example 1 Comparative Example 4 <Instead of using a non-carrier double-sided adhesive sheet, the adhesive layer is formed using a different coater.> A combination of adhesive layer raw materials similar to those used in Manufacturing Example 2 was prepared by blending and mixing the same materials, and this was applied to a reinforcing veneer 2 similar to that used in Manufacturing Example 1 using a curtain coater and a roll coater. The release sheet 7 was placed over the entire surface of the coating, and the entire surface was exposed to light in the same manner as in manufacturing example 2.

[0154] However, with either a curtain coater or a roll coater, it was not possible to stably and consistently apply (form) a thick adhesive layer 6 as in manufacturing example 2. Both the unexposed adhesive layer 6 and the exposed adhesive layer 6 exhibited extremely poor adhesive strength, making it unnecessary to evaluate on-site application, adhesion to the target surface, and long-term stability.

[0155] Comparative Manufacturing Example 2 Comparative Example 5 <Instead of using a non-carrier double-sided adhesive sheet, an adhesive layer is formed using another coater (a preferred adhesive layer raw material (adhesive layer forming liquid) is prepared and used for the said coater).> 40 parts by mass of methyl methacrylate-butyl acrylate copolymer (weight-average molecular weight 300,000), 5 parts by mass of tackifying resin (weight-average molecular weight 3,000), 5 parts by mass of vinyl acetate, and 55 parts by mass of ethyl acetate as a coating solvent were mixed and stirred to dissolve and obtain a transparent adhesive layer forming liquid.

[0156] With the base material 5 side of the reinforcing veneer 2 obtained in Manufacturing Example 1 facing upwards, the adhesive layer-forming liquid obtained above was applied to its surface using a curtain coater. After heating the adhesive layer forming solution and applying it using a curtain coater, the coating solvent (ethyl acetate) was allowed to evaporate during transport over 30 seconds, forming an adhesive layer 6 with a thickness of 15 μm. Subsequently, a release sheet 7 was attached to the adhesive layer 6 to obtain a comparative decorative panel P.

[0157] As described above, the rectangular comparative decorative panels P measuring 1 shaku (30 cm) x 3 shaku (91 cm) were peeled off one by one by an operator in front of the object T, in the same manner as in Example 1, and the panels were immediately attached to the object surface. A general-purpose primer was applied to the object surface beforehand.

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

[0159] As shown in manufacturing examples 2 and 4, by applying and forming an adhesive layer 6 on the reinforcing veneer 2 using a non-carrier double-sided adhesive sheet 9, a suitable adhesive layer composition (raw material) can be used, and the adhesive layer 6 can be made thicker. Therefore, compared to other methods, such as comparative manufacturing example 5, which use an adhesive layer composition suitable for other coaters and can only stably form a thin adhesive layer 6, the resulting natural wood veneer 1 with an adhesive layer has extremely superior adhesion to the object T and excellent adhesive stability over time. [Industrial applicability]

[0160] The adhesive-coated natural wood decorative panel 1 of the present invention improves workability at construction sites, reduces defective construction that may be discovered later due to peeling of some decorative panels 1, and even when using natural wood decorative panels 1, reduces the total construction cost. Therefore, it is widely used for the construction of surfaces of buildings such as interior walls, exterior walls, and ceilings, as well as for the construction of interior furnishings such as furniture and shelves. [Explanation of symbols]

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

Claims

1. In order, a veneer made by slicing natural wood, an adhesive layer for bonding the veneer to a base material, and a reinforcing veneer having a base material are attached in order to the base material side of the reinforcing veneer having a base material. A non-carrier double-sided adhesive sheet having an adhesive layer protected by a release sheet is attached in advance outside the construction site to this adhesive layer, thereby manufacturing a natural wood decorative panel with an adhesive layer having the reinforcing veneer and the adhesive layer, which is protected by a release sheet. A construction method in which the release sheet is peeled off at the construction site, and the natural wood veneer with the adhesive layer from which the release sheet has been peeled off is sequentially applied to the target surface, The adhesive layer contains (meth)acrylic acid ester, polymerizable monomers other than (meth)acrylic acid ester, polymerization initiator, tackifying compound, and fine particles, and has a thickness of 30 μm to 500 μm. This construction method involves applying a primer to a large surface area consisting of two or more rectangles, each with a shorter side between 1 shaku (30 cm) and 10 shaku (303 cm), and then attaching adhesive-backed natural wood veneer panels on top of it. A method for using a natural wood veneer with an adhesive layer, characterized by placing a spacer on a support sheet, applying an adhesive layer raw material composition to the support sheet to obtain a coating film, covering the coating film with a release sheet, and then irradiating with light or heating to obtain an adhesive layer sandwiched between the support sheet and the release sheet, and then peeling off the support sheet and adhering it to the base material side of the reinforcing veneer to obtain the natural wood veneer with the adhesive layer.

2. A method of construction using a natural wood veneer with an adhesive layer according to claim 1, wherein the (meth)acrylic acid ester contains a polar group-free (meth)acrylic acid ester and a polyfunctional (meth)acrylic acid ester.

3. A method of construction using a natural wood veneer with an adhesive layer according to claim 1, wherein the tackifying compound contains a hydrogenated compound.

4. A method of construction using a natural wood decorative board with an adhesive layer according to Claim 1, wherein the thickness of the adhesive layer is 300 μm or more and 500 μm or less.

5. A method of construction using the adhesive-coated natural wood veneer according to claim 1, wherein the adhesive-coated natural wood veneer does not use phenolic resin or polyvinyl chloride resin.

6. The method of construction using the adhesive-coated natural wood veneer according to claim 1, wherein the adhesive-coated natural wood veneer has a rectangular shape with at least one side measuring 1 shaku (30 cm) or more and 10 shaku (303 cm) or less.

7. A method of construction using a natural wood decorative panel with an adhesive layer according to any one of claims 1 to 6, wherein the target surface is an interior wall, exterior wall, ceiling, door, built-in furniture, screen, or furniture.

8. A method of construction using a natural wood veneer with an adhesive layer according to any one of claims 1 to 6, wherein the "natural wood veneer with adhesive layer" is attached to a "vertically positioned surface or a downward-facing surface" at the construction site without applying adhesive to the target surface or the substrate.

9. A method for manufacturing an adhesive-coated natural wood veneer protected by a release sheet, for use in a construction method using an adhesive-coated natural wood veneer according to any one of claims 1 to 6, A method for manufacturing a natural wood decorative panel with an adhesive layer, comprising: adhering a non-carrier double-sided adhesive sheet having an adhesive layer and a release sheet to the side of the base material of a reinforcing veneer having, in order, a veneer made by slicing natural wood, an adhesive layer for adhering the veneer to a base material, and a base material. A method for manufacturing a natural wood veneer with an adhesive layer, characterized by placing a spacer on a support sheet, applying an adhesive layer raw material composition to the support sheet to obtain a coating film, covering the coating film with a release sheet, irradiating with light or heating to obtain an adhesive layer sandwiched between the support sheet and the release sheet, then peeling off the support sheet and adhering it to the base material side of the reinforcing veneer to obtain the natural wood veneer with an adhesive layer, wherein the adhesive layer is protected by a release sheet.

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