Stainable decorative sheet and method for coloring decorative sheet

Abstract

To provide a stainable decorative sheet which has good touch feeling of the surface and stainability while having good adhesion between a paper base material and non-woven fabric, and is excellent in transparency, and a coloring method for a decorative sheet using the stainable decorative sheet.SOLUTION: A stainable decorative sheet has a paper base material, an adhesive layer provided on at least one surface side of the paper base material, a non-woven fabric layer provided on the other surface side on a surface provided with the paper base material of the adhesive layer, and a transparency improving layer provided on the other surface side on a surface provided with the adhesive layer of the non-woven fabric layer. The non-woven fabric layer partially has a filling part A obtained by filling a partial gap of fibers constituting the non-woven fabric layer with a resin forming the adhesive layer on a surface side provided with the adhesive layer in a thickness direction in the layer, and a filling part B obtained by filling a partial gap of fibers constituting the non-woven fabric layer with a resin for forming the transparency improving layer on a surface side provided with the transparency improving layer in the thickness direction in the layer.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a stainable decorative sheet and a method for coloring a decorative sheet. [Background technology]

[0002] It is common, mainly in Europe and the US, for ordinary consumers to use stain paint to paint the surfaces of wooden building interior materials, furniture surfaces, etc., and to paint the surfaces of wooden furniture, etc. (DIY: Do It Yourself). Such stain paint penetrates into the wood to color it, and has the characteristic of being able to make use of the wood's inherent design and appearance, such as the grain and luster (pearl-like gloss), because it does not conceal the wood grain itself or form a film on the surface.

[0003] In recent years, decorative sheets made by printing wood grain patterns on the surface of sheet-like substrates, instead of natural wood, have come to be used as interior materials for buildings and surface materials for furniture, and decorative sheets that can be stained using the above-mentioned stain paint (hereinafter also referred to as "stainable decorative sheets") have been manufactured. Specifically, the stainable decorative sheets are surface-treated to ensure the adhesion of stain paint, assuming that the purchaser will achieve the desired texture by coating the stain paint themselves.

[0004] As such a decorative sheet, a recoatable decorative sheet has been proposed in which a pattern layer is printed on a polyvinyl chloride (PVC) resin substrate and then heat-sealed with a nonwoven fabric (see, for example, Patent Document 1). This recoatable decorative sheet can be repainted (recoated), i.e., stained, and is popular with consumers because the nonwoven fabric gives the surface a fine unevenness that closely resembles the feel of wood. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 9-262934 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when a PVC substrate is used as the substrate, the cost of the decorative sheet becomes high, and when a PVC substrate is used as the substrate, it may cause an environmental problem when it is incinerated for disposal, since it generates gases containing chlorine atoms such as hydrogen chloride (HCl).

[0007] In order to solve the above problems, it has been considered to change the substrate to a paper substrate, but such a change is expected to cause various problems. For example, when laminating a nonwoven fabric on a paper substrate, the paper substrate and the nonwoven fabric do not adhere to each other, so the method of adhering the paper substrate and the nonwoven fabric becomes an issue. If an adhesive layer is provided between the paper substrate and the nonwoven fabric to adhere them, the unevenness of the nonwoven fabric may be lost, and a problem may occur in which the texture similar to that of wood is lost. On the other hand, if the unevenness of the nonwoven fabric is used too much, the texture may be lost due to the fluffing of the nonwoven fabric, and the transparency of the decorative sheet may decrease due to the difference in refractive index caused by the voids in the fibers that make up the nonwoven fabric, and the design may be deteriorated.

[0008] In decorative sheets that have been changed to a paper substrate, it is difficult to achieve both water resistance and solvent resistance, and the solvent of the stain paint (solvent, alcohol, etc.) may penetrate into the paper substrate, resulting in a decrease in the physical properties of the decorative sheet. Therefore, it is difficult to achieve both the strength, mass, flexibility, and other physical properties of the decorative sheet while ensuring the application suitability (called "stainability" in English, but the term "stainableness" is used in this specification even when used as a noun) that ensures the permeability and ink-receiving ability of colorants such as water-based stain paints and oil-based stain paints.

[0009] In view of the above problems, the present invention aims to provide a stainable decorative sheet that has good adhesion between a paper base material and a nonwoven fabric, has a good surface feel and stainability, and is also excellent in transparency, and a method for coloring a decorative sheet using said stainable decorative sheet. [Means for solving the problem]

[0010] In order to solve the above problems, the present inventors conducted intensive research and discovered that the above problems can be solved by a stainable decorative sheet having the following configuration.

[0011] 1. A stainable decorative sheet comprising a paper base material, an adhesive layer provided on at least one side of the paper base material, a nonwoven fabric layer provided on the other side of the adhesive layer on the side on which the paper base material is provided, and a transparency improving layer provided on the other side of the nonwoven fabric layer on the side on which the adhesive layer is provided, wherein the nonwoven fabric layer partially has a filled portion A on the side on which the adhesive layer is provided in the thickness direction of the layer, where a resin that forms the adhesive layer has filled some of the voids in the fibers that constitute the nonwoven fabric layer, and a filled portion B on the side on which the transparency improving layer is provided in the thickness direction of the layer, where a resin that forms the transparency improving layer has filled some of the voids in the fibers that constitute the nonwoven fabric layer. 2. The stainable decorative sheet according to the above item 1, wherein the nonwoven fabric layer is made of at least one type of fiber selected from thermoplastic resin fibers and recycled fibers. 3. The stainable decorative sheet according to the above 1 or 2, wherein the resin forming the adhesive layer is at least one type of resin selected from the group consisting of urethane resins and polyolefin resins. 4. The stainable decorative sheet according to any one of the above 1 to 3, wherein the resin forming the transparency improving layer is at least one resin selected from the group consisting of acrylic resins, acrylic polyol resins and urethane resins. 5. The stainable decorative sheet according to any one of the above 1 to 4, further comprising a decorative layer between the paper substrate and the adhesive layer. 6. The stainable decorative sheet according to the above item 5, wherein the decorative layer exhibits a wood grain pattern. 7. A method for coloring a decorative sheet, comprising applying a colorant to said transparency improving layer side of the stainable decorative sheet according to any one of 1 to 6 above, thereby coloring said nonwoven fabric layer. Effect of the Invention

[0012] According to the present invention, it is possible to provide a stainable decorative sheet which has good adhesion between a paper base material and a nonwoven fabric, has a good surface feel and stainability, and is also excellent in transparency, and a method for coloring a decorative sheet using said stainable decorative sheet. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic cross-sectional view showing one embodiment of the stainable decorative sheet of the present embodiment. [Diagram 2] FIG. 1 is a schematic cross-sectional view showing one embodiment of the stainable decorative sheet of the present embodiment. [Diagram 3] FIG. 1 is a schematic cross-sectional view showing one embodiment of the stainable decorative sheet of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention (hereinafter, sometimes referred to as "the present embodiment") will be described. In this specification, the numerical values ​​related to "greater than or equal to," "less than or equal to," and "to" in relation to the description of a numerical range are numerical values ​​that can be arbitrarily combined, and the numerical values ​​in the examples are numerical values ​​that can be used as the upper and lower limits of the numerical range.

[0015] [Stainable decorative sheet] The stainable decorative sheet of this embodiment comprises a paper base material, an adhesive layer provided on at least one side of the paper base material, a nonwoven fabric layer provided on the other side of the adhesive layer on the side on which the paper base material is provided, and a transparency improving layer provided on the other side of the nonwoven fabric layer on the side on which the adhesive layer is provided, and is characterized in that the nonwoven fabric layer partially has a filled portion A on the side on which the adhesive layer is provided in the thickness direction of the layer, in which a resin that forms the adhesive layer fills some of the voids in the fibers that constitute the nonwoven fabric layer, and a filled portion B on the side on which the transparency improving layer is provided in the thickness direction of the layer, in which a resin that forms the transparency improving layer fills some of the voids in the fibers that constitute the nonwoven fabric layer.

[0016] The stainable decorative sheet of this embodiment, having the above-mentioned configuration, exhibits the effects of providing good adhesion between the paper base material and the nonwoven fabric, while also providing good surface feel and stainability, as well as excellent transparency; in achieving these effects, filling section A formed from the adhesive layer and the nonwoven fabric layer, and filling section B formed from the transparent resin layer and the nonwoven fabric layer, in particular, play an important role. In relation to the adhesive layer and the transparent resin layer, the nonwoven fabric layer can be said to be a layer having two filling parts, filling parts A and B. Filling part A is formed by at least a part of the resin forming the adhesive layer penetrating into the nonwoven fabric layer, so that excellent adhesion between the paper base material and the nonwoven fabric layer is obtained. On the other hand, filling part B is formed by at least a part of the resin forming the transparency improving layer penetrating into the nonwoven fabric layer, so that, together with the transparent protective layer, the nonwoven fabric layer is kept in a good state of fluff, giving it a good feel and stainability, while suppressing the fluffing (surface unevenness) of the nonwoven fabric layer and the decrease in transparency due to the refractive index caused by voids, and obtaining excellent design properties.

[0017] The stainable decorative sheet of this embodiment will be described below with reference to the drawings. In the following description of the drawings, the same or similar parts are represented by the same or similar symbols. However, the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc. differ from the actual ones. Therefore, the specific thickness and dimensions should be judged in light of the following description. In addition, it goes without saying that the drawings include parts with different dimensional relationships and ratios.

[0018] 1 shows that the stainable decorative sheet 1 comprises a paper substrate 10, an adhesive layer 20 provided on at least one surface 11 of the paper substrate 10, a nonwoven fabric layer 30 provided on the other surface of the adhesive layer 20 on the surface on which the paper substrate 10 is provided, and a transparency improving layer 40 provided on the other surface of the nonwoven fabric layer 30 on the surface on which the adhesive layer 20 is provided. The nonwoven fabric layer 30 of the stainable decorative sheet 1 of this embodiment is shown to partially have a filled portion A31 on the surface 30a on which the adhesive layer 20 is provided in the thickness direction of the layer, in which a resin forming the adhesive layer 20 is filled into a part of the voids of the fibers constituting the nonwoven fabric layer 30, and a filled portion B33 on the surface 30b on which the transparency improving layer 40 is provided in the thickness direction of the layer, in which a resin forming the transparency improving layer 40 is filled into a part of the voids of the fibers constituting the nonwoven fabric layer 30. Figure 2 shows that the stainable decorative sheet 1 shown in Figure 1 further has a decorative layer 50 composed of an overall colored layer 51 and a pattern layer 52. Figure 3 shows a stainable decorative sheet 1 having the same layer structure as Figure 2, and illustrates the state of the nonwoven fabric layer 30 and the states of the filled portions A31 and B33 present between the nonwoven fabric layer 30 and the adhesive layer 20 and the transparency improving layer 40 in a manner that more closely resembles an actual nonwoven fabric.

[0019] (Paper base material 10) From the viewpoints of cost reduction and environmental issues, a paper substrate is used for the stainable decorative sheet 1 of this embodiment. The paper substrate 10 functions as a support for providing other layers in the stainable decorative sheet 1 of this embodiment. Examples of the substrate that can be used for the paper substrate 10 include fine paper, tissue paper, linter paper, kraft paper, reinforced inter-paper paper, resin-impregnated paper, wallpaper backing paper, and flame-retardant paper obtained by mixing or impregnating these papers with a flame retardant. These materials may be used alone, or may be laminated in any combination, such as a laminate of papers. The paper base material 10 may contain additives such as flame retardants, inorganic agents, dry strength agents, wet strength agents, colorants, sizing agents, and fixing agents as required.

[0020] The thickness of the paper substrate 10 is evaluated and indicated by basis weight (mass per unit area). There is no particular limit to the thickness (i.e., basis weight), but taking into consideration the durability and ease of handling of the decorative sheet, a basis weight of 20 g / m 2 More than 150g / m 2 The range is preferably 25 g / m 2 More than 120g / m 2 More preferably, the range is 35 g / m 2 More than 100g / m 2 More preferably, the range is 40 g / m 2 More than 60g / m 2 The following ranges are even more preferred:

[0021] (adhesive layer 20) The adhesive layer 20 is a layer provided on at least one surface 11 of the paper base material 10 , and is a layer provided for bonding the paper base material 10 and the nonwoven fabric layer 30 together. The adhesive used in the adhesive layer 20 can be any adhesive made of various resins without any particular limitations. Examples of resins forming the adhesive include urethane resin, polyolefin resin, acrylic resin, epoxy resin, etc., and these resins can be used alone or in combination. Among them, urethane resin and polyolefin resin are preferred, and it is more preferred to adopt urethane resin. By using these resins, excellent adhesion can be obtained while suppressing the penetration of the solvent (solvent, alcohol) of the stain paint applied to the nonwoven fabric layer 30 into the paper substrate 10, making it easier to maintain the physical properties of the stainable decorative sheet 1, such as strength, mass, and flexibility.

[0022] As the urethane resin, either a thermoplastic urethane resin or a curable urethane resin may be used, but it is preferable to use a curable urethane resin from the viewpoint of improving the adhesive strength between the paper base material and the nonwoven fabric layer. On the other hand, when focusing on the material, the time required to complete adhesion, and further the cost of production while ensuring the adhesive strength between the paper base material and the nonwoven fabric layer, it is preferable to use a thermoplastic urethane resin that is relatively inexpensive and requires a relatively short time to complete adhesion. The curable urethane resin may be either a two-component curing type or a one-component curing type, and from the viewpoint of adhesiveness, a two-component curing type urethane resin is preferred. The two-component curing urethane resin is a urethane resin containing polyol as a main component and polyisocyanate as a crosslinking agent (curing agent), and examples of the polyol include compounds having two or more hydroxyl groups in the molecule, such as polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, polyether polyol, polycarbonate polyol, polycaprolactone polyol, urethane polyol, etc. Examples of the polyisocyanate include compounds having two or more isocyanate groups in the molecule, such as aromatic isocyanates such as 2,4-tolylene diisocyanate, xylylene diisocyanate, naphthalene diisocyanate, and 4,4'-diphenylmethane diisocyanate, and aliphatic (or alicyclic) isocyanates such as 1,6-hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, and hydrogenated diphenylmethane diisocyanate. Further, examples of the polyisocyanate include adducts or oligomers of the above-mentioned various polyisocyanates, such as an adduct of tolylene diisocyanate and a tolylene diisocyanate trimer.

[0023] Thermoplastic urethane resin is a copolymer in which monomers are copolymerized with urethane bonds formed by condensation of an isocyanate group and a compound having a hydroxyl group such as an alcohol group. As described above, by using a thermoplastic urethane resin to form an adhesive layer, the stainability is particularly improved. Thermoplastic urethane resin has a high wetting tension, specifically, tends to be 70 mN / m or more, that is, it is easy to increase the wetting tension of the adhesive layer, and therefore it is considered that the improved ink adhesion leads to improved stainability. Therefore, when focusing on the improvement of stainability, it is preferable that the wetting tension of the adhesive layer (the wetting tension of the resin forming the adhesive layer) is 70 mN / m or more. In this specification, the wetting tension is measured by the method described in the examples described later. From the viewpoint of increasing the wet tension of the adhesive layer and improving the stainability, it is preferable that the properties of the thermoplastic urethane resin are adjusted to a desired wet tension by adjusting the properties that are likely to affect the wet tension, such as the number of functional groups and the proportion of urethane bonds in the molecule, and by selecting a polyol that constitutes the urethane resin in consideration of the hydroxyl value (for example, the hydroxyl value described as that possessed by a resin containing many hydroxyl groups, which will be described later). From the same viewpoint, the glass transition point of the thermoplastic urethane resin is preferably -60°C or more and 50°C or less, more preferably -55°C or more and 20°C or less, and even more preferably -50°C or more and 0°C or less.

[0024] Examples of polyolefin resins include those containing one or more monoolefins such as ethylene, propylene, butene, pentene, hexene, heptene, octene, and 4-methyl-1-pentene as monomer units, as well as those containing monomer units other than monoolefins, such as alicyclic olefins such as cyclopentene and cyclohexene, linear or cyclic polyenes such as 1,4-hexadiene, 1,5-hexadiene, divinylbenzene, 1,3-cyclopentadiene, 1,3-cyclohexadiene, and 5-vinyl-2-norbornene, and aromatic vinyl compounds such as styrene and substituted styrene. From the viewpoint of adhesion to the paper substrate 10 and the nonwoven fabric layer 30, the polyolefin resin is preferably a polyethylene resin containing ethylene as a monomer unit.

[0025] When a urethane resin or a polyolefin resin is used, the ratio of the urethane resin or the polyolefin resin to the total resin forming the adhesive layer 20 is preferably 50% or more, more preferably 70% or more, even more preferably 90% or more, and most preferably 100%.

[0026] The above-mentioned resin that forms the adhesive layer 20 in this embodiment can be used as a resin composition in which additives such as weathering agents such as ultraviolet absorbers and light stabilizers, body pigments, solvents, stabilizers, plasticizers, etc. are appropriately mixed. That is, the adhesive layer 20 can be formed from a resin composition that contains additives in addition to the above-mentioned resin.

[0027] The thickness of the adhesive layer 20 cannot be specified as a specific value because it can vary depending on the materials of the paper base material 10 and the nonwoven fabric layer 30, the thickness of the nonwoven fabric layer 30, etc.; however, from the viewpoint of, for example, the adhesion between the paper base material 10 and the nonwoven fabric layer 30, forming the filling portion A31, the filling portion B33 and the fiber portion 32 in a balanced manner, improving the stainability and transparency in a balanced manner, and further imparting water resistance and solvent resistance, the total thickness of the adhesive layer 20 and the filling portion A31 is preferably 3 μm or more, more preferably 5 μm or more, even more preferably 8 μm or more, and even more preferably 10 μm or more, with the upper limit being less than the thickness of the nonwoven fabric layer 30, and preferably 30 μm or less, more preferably 27 μm or less, even more preferably 23 μm or less, and even more preferably 20 μm or less. The total thickness of the adhesive layer 20 and the filling portion A31 is calculated by measuring the thickness at any 30 points on a cross-sectional image taken using various electron microscopes such as a transmission electron microscope (TEM), a scanning electron microscope (SEM), or a scanning transmission electron microscope (STEM), and is the average value of the thicknesses at the 30 points.

[0028] (Non-woven fabric layer 30) The nonwoven fabric layer 30 is a layer that ensures the ink-receiving ability of colorants such as water-based stain paint and oil-based stain paint to penetrate into the gaps in the fibers that form the nonwoven fabric layer 30, i.e., the fiber portion 32, and exhibits stainability.The nonwoven fabric layer 30 partially has a filled portion A31 on the side 30a in the thickness direction of the layer where the adhesive layer 20 is provided, where a portion of the gaps in the fibers that form the nonwoven fabric layer 30 is filled with the resin that forms the adhesive layer 20, and a filled portion B33 on the side 30b in the thickness direction of the layer where the transparency improving layer 40 is provided, where a portion of the gaps in the fibers that form the nonwoven fabric layer 30 is filled with the resin that forms the transparency improving layer 40.

[0029] Examples of fibers constituting the nonwoven fabric layer 30 include thermoplastic resin fibers, natural fibers, regenerated fibers, and semi-synthetic fibers, and from the viewpoint of stainability, thermoplastic resin fibers and regenerated fibers are preferred. In this embodiment, the fibers can be used alone or in combination of multiple types.

[0030] Preferred examples of thermoplastic resin fibers include thermoplastic resin fibers made of (meth)acrylic resins such as poly(meth)acrylic acid ester; polyvinyl acetal (butyral resins) such as polyvinyl butyral; polyester resins such as polyethylene terephthalate and polybutylene terephthalate; polyolefin resins such as polyethylene and polypropylene; styrene resins such as polystyrene and α-methylstyrene; acetal resins such as polyoxymethylene; thermoplastic elastomers such as polyolefin thermoplastic elastomers, polystyrene thermoplastic elastomers, polydiene thermoplastic elastomers, urethane thermoplastic elastomers, polyester thermoplastic elastomers, and fluororesin thermoplastic elastomers; fluororesins such as vinyl chloride resins, urethane resins, and ethylene-4-fluoroethylene copolymers, polyamide resins, polyimide resins, polylactic acid resins, polycarbonate resins, polyvinyl acetal resins, and liquid crystalline polyester resins. Among these thermoplastic resin fibers, in consideration of dimensional stability, thermoplastic resin fibers made of resins such as polyester resin, polyolefin resin, and urethane resin are preferred, and thermoplastic resin fibers made of polyester resin and polyolefin resin are more preferred.

[0031] In this embodiment, the thermoplastic resin constituting the thermoplastic resin fiber may be a single type or a combination of multiple types, and may be, for example, a composite fiber such as a double-structure fiber in which the core is a polyester resin and the sheath is a polyolefin resin.

[0032] Examples of natural fibers include fibers made from natural materials such as cotton, wool, and silk. Examples of regenerated fibers include rayon (also called artificial silk), cupra (also called cuprammonium rayon), and lyocell. Examples of semi-synthetic fibers include triacetate and promix. Among the above fibers, fibers with many hydroxyl groups are preferred, for example, regenerated fibers, especially rayon fibers. Fibers with many hydroxyl groups have high wet tension (specifically, 70 mN / m or more), and it is easy to increase the wet tension of the nonwoven fabric layer, which improves the adhesion of the stain paint and thereby improves the stainability. Therefore, from the viewpoint of improving the stainability, it is preferable that the wet tension of the nonwoven fabric layer (the wet tension of the resin forming the adhesive layer) is 70 mN / m or more.

[0033] Although there is no particular restriction on the fiber diameter of the fibers constituting the nonwoven fabric layer 30, taking into consideration the feel, the average fiber diameter is preferably 0.5 μm or more, more preferably 1 μm or more, and the upper limit is preferably 50 μm or less, more preferably 30 μm or less, and even more preferably 20 μm or less. A nonwoven fabric made of fibers having an average fiber diameter in this range tends to have a feel very similar to that of wood. The average fiber diameter of the fibers that make up a nonwoven fabric can be measured by using an electron microscope (300x) to measure the fiber widths (diameters) of 30 fibers present at any given location in the nonwoven fabric and averaging the values ​​obtained for each measurement.

[0034] The fibers constituting the nonwoven fabric layer 30 can be formed, for example, by forming fleece by a spunbond method and bonding the formed fleece by a thermal bond method, a spunlace method (a hydroentanglement method), etc. Furthermore, the nonwoven fabric layer 30 formed by these methods tends to have a texture very similar to that of wood.

[0035] The basis weight of the fibers constituting the nonwoven fabric layer 30 is not particularly limited, but from the viewpoint of obtaining the strength of the nonwoven fabric layer 30, it is preferably 10 g / m 2More preferably, 15 g / m 2 The upper limit is preferably 40 g / m 2 Less than or equal to 30 g / m 2 More preferably, 20 g / m 2 The following is the result.

[0036] The thickness of the nonwoven fabric layer 30 is not particularly limited, but taking into consideration the physical properties such as strength, mass, and flexibility of the stainable decorative sheet 1, it is preferably 30 μm or more, more preferably 50 μm or more, even more preferably 60 μm or more, and even more preferably 70 μm or more, with the upper limit being preferably 250 μm or less, more preferably 200 μm or less, even more preferably 150 μm or less, and even more preferably 100 μm or less.

[0037] (Filling section A31 and filling section B33) The nonwoven fabric layer 30 has a surface 30a on which the adhesive layer 20 is provided in the thickness direction, which is provided with a filled portion A31 in which some of the voids in the fibers are filled with the resin that forms the adhesive layer 20. By having the filled portion A31, the stainable decorative sheet 10 of this embodiment can improve the adhesion between the paper base material 10 and the nonwoven fabric layer 30, and can also contribute to improving transparency.

[0038] The filled portion A31 is a portion in which the resin forming the adhesive layer 20 has filled the voids in the fibers forming the nonwoven fabric layer 30, leaving no voids, and therefore does not have the ink-retentive properties to allow colorants such as water-based stain paint and oil-based stain paint to penetrate.

[0039] Furthermore, the surface 30b side of the nonwoven fabric layer 30 in the thickness direction on which the transparency improving layer 40 is provided is provided with a filled portion B33 in which some of the voids in the fibers are filled with a resin that forms the transparency improving layer 40. By providing the filled portion B33, it is possible to suppress a decrease in transparency caused by the refractive index due to the voids in the fibers, and to obtain an excellent design.

[0040] Filled portion B33, like filled portion A31, is in a state in which the resin forming the transparency improving layer 40 fills the voids in the fibers that form the nonwoven fabric layer 30, leaving no voids, and is therefore a portion that does not have the ink-retentive properties to allow colorants such as water-based stain paint and oil-based stain paint to penetrate.

[0041] In the stainable decorative sheet of this embodiment, the nonwoven fabric layer 30 partially has the above-mentioned filled portion A31 and filled portion B33. That is, the nonwoven fabric layer 30 needs to have the fibrous portion 32 described below, which is the portion other than the filled portion A31 and filled portion B33. Without the fibrous portion 32, which is the portion other than the filled portions, these filled portions will have no voids remaining, and will not have the ink-retentiveness to allow the penetration of colorants such as water-based stain paints and oil-based stain paints, and therefore will not be able to obtain stainability. 1 and 2, which are schematic cross-sectional views (conceptual diagrams), are shown as if the filled parts A31 and B33 exist in a continuous layer covering the entire surface for the sake of simplicity of illustration and convenience of explanation of the layer structure concept, but in reality, it is considered that they do not present a uniform layer as shown in the figures. Considering that coloring agents such as water-based stain paint and oil-based stain paint penetrate and color the nonwoven fabric layer 30, for example, in a certain range in the thickness direction of the layer of the nonwoven fabric layer 30 shown as the filled parts A31 and B33 in the figures, the voids of the fibers forming the nonwoven fabric layer 30 are filled with the resin forming the adhesive layer 20 and the resin forming the transparency improving layer 40, and a large number of minute areas of the filled parts A31 and B33, which are composed of minute areas of the structure, are discontinuously present or scattered with a small amount of unfilled fiber parts 32 interposed therebetween. In addition, in both filling section A and filling section B, the resin gradually penetrates from the outer surface of the nonwoven fabric layer 30 into the interior of the nonwoven fabric layer 30. Depending on how the processing conditions are adjusted, the nonwoven fabric layer 30 may have a three-layer structure, as shown in Figure 3, of filling section A31 (consisting of multiple small areas of filling section A with fiber sections 32 interspersed between them) located on the side closer to the paper base material 20, filling section B33 (consisting of multiple small areas of filling section B with fiber sections 32 interspersed between them) located on the opposite side to the paper base material 20, and fiber sections 32 (the gaps between the fibers are unfilled) sandwiched between filling section A31 and filling section B33.

[0042] (Textile section 32) As described above, the stainable decorative sheet of this embodiment is a layer that partially has the filling portion A31 and the filling portion B33, and therefore naturally has a portion other than these filling portions, i.e., the fiber portion 32. The fiber portion 32 is easy to understand by looking at the fiber portion 32 illustrated in Figures 1 to 3, particularly Figure 3, and is a portion of the nonwoven fabric layer 30 that is not filled with the resin that forms the adhesive layer 20 and the transparency improving layer 40, and where the fibers of the nonwoven fabric that form the fiber portion 32 remain in a state of leaving voids. By having the fiber portion 32, the stainable decorative sheet of this embodiment ensures the ink-receiving property that allows colorants such as water-based stain paint and oil-based stain paint to enter the voids in the fibers, and exhibits stainability.

[0043] The form of the fiber portion 32 is not particularly limited as long as it is not filled with the resin forming the adhesive layer 20 and the transparency improving layer 40 and voids remain, but examples include a form in which the resin forming the adhesive layer 20 and the transparency improving layer 40 does not penetrate at all into the voids of the fibers forming the nonwoven fabric layer 30, and the fibers remain as they are, and have voids in the fibers, as shown in Figure 3, and a form in which the resin forming the adhesive layer 20 and the transparency improving layer 40 penetrates to some extent, but the fibers are merely coated with these resins, and have voids in the coated resin, etc. In the stainable decorative sheet of this embodiment, the form of the fiber portion 32 may be any one of these.

[0044] As described above, the fiber portion 32 is a portion that is not filled with the resin that forms the adhesive layer 20 and the transparency improving layer 40, that is, a portion other than the filling portion A31 and the filling portion B33. In Figs. 1 and 2, the fiber portion 32 is shown as being in a layered form, but the filling portion A31 and the filling portion B33 are considered to be continuously present or scattered within a certain range in the thickness direction of the nonwoven fabric layer 30 in the tank as shown in Fig. 3, as described above, and therefore are not strictly present in a layered form. Therefore, the fiber portion 32 is considered to be continuously present or scattered within a certain range in the thickness direction of the nonwoven fabric layer 30 in the tank, as shown as the fiber portion 32 in Figs. 1 to 3.

[0045] As a method for making the nonwoven fabric layer 30 partially have the filling portion A31 and the filling portion B33, for example, a method by adjusting the coating amount of the resin composition used when forming the adhesive layer 20 and the coating amount of the resin composition used when forming the transparency improving layer 40 can be mentioned. For example, when the coating amount of the resin composition used when forming the adhesive layer 20 is increased, the ratio of the filling portion A31 in the nonwoven fabric layer 30 increases, and on the other hand, when the coating amount of the resin composition used when forming the transparency improving layer 40 is increased, the ratio of the filling portion B33 in the nonwoven fabric layer 30 increases. In addition, when the coating amount of the resin composition used when forming the adhesive layer 20 and the transparency improving layer 40 is increased, the ratio of the fiber portion 32 in the nonwoven fabric layer 30 decreases, and when the coating amount is decreased, the ratio of the fiber portion 32 in the nonwoven fabric layer 30 increases. In this embodiment, for example, by adjusting the application amount, etc., it is possible to obtain a desired state of the nonwoven fabric layer 30.

[0046] (Transparency improvement layer 40) The transparency improving layer 40 is a layer provided on the other surface 30b side of the surface 30a of the nonwoven fabric layer 30 on which the adhesive layer 20 is provided (i.e., the surface side of the decorative sheet 1), and by adjusting the fuzz of the nonwoven fabric layer 30, the fuzz (surface irregularities) can be reduced while ensuring the stainability of the decorative sheet, thereby suppressing the deterioration of the touch due to the fuzz. In addition, the transparency improving layer 40 can reduce the difference in refractive index between the voids and the constituent fibers of the nonwoven fabric layer 30, thereby improving the transparency of the nonwoven fabric layer 30 when the nonwoven fabric layer 30 is observed from the other surface 30b side, and reducing the haze. As a result, it is a layer that can not only improve the transparency of the stainable decorative sheet of this embodiment, but also impart touch and stainability.

[0047] As the resin forming the transparency improving layer 40, either a thermoplastic resin or a curable resin can be adopted, and for example, acrylic resin, styrene resin, polyester resin, urethane resin, epoxy resin, cellulose-based resin, etc. are preferably mentioned. Among them, from the viewpoint of improving design by improving transparency, acrylic resin, acrylic polyol resin, and urethane resin are preferable, and acrylic resin and acrylic polyol resin are more preferable. In addition, in the case of a curable resin, it may be a one-component curing type or a two-component curing type, but from the viewpoint of improving stainability, the amount of the curing agent added is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, relative to 100 parts by mass of the main agent. In addition, these resins may be used alone or in combination of multiple types. In addition, vinyl chloride resin is not preferable in consideration of the load on the environment when burned.

[0048] The resin forming the transparency improving layer 40 may be appropriately selected from the resins exemplified above, but it is preferable to select one that has a high wet tension (specifically, 70 mN / m or more) and is easy to increase the wet tension of the transparency improving layer, in that the adhesion of the stain paint is improved, thereby improving the stainability. Therefore, in terms of improving the stainability, it is preferable that the wet tension of the transparency improving layer (the wet tension of the resin forming the transparency improving layer) is 70 mN / m or more. Resins containing many hydroxyl groups tend to have a wet tension of 70 mN / m or more, and from this perspective, for example, a hydroxyl value of 5 mgKOH / g or more, more preferably 10 mgKOH / g or more, even more preferably 15 mgKOH / g or more, even more preferably 20 mgKOH / g or more, and preferably 60 mgKOH / g or less, more preferably 55 mgKOH / g or less, even more preferably 50 mgKOH / g or less, and even more preferably 45 mgKOH / g or less is suitable. In this specification, the hydroxyl value is measured based on JIS K1557-1:2007 (Plastics - Test method for polyurethane raw material polyols - Part 1: Determination of hydroxyl value). This hydroxyl value can also be applied to the above-mentioned thermoplastic urethane resin. As for the type of resin, among the above resins, an acrylic polyol resin is preferable, and it is preferable to use an acrylic polyol resin in combination with an isocyanate curing agent.

[0049] In this embodiment, it is preferable in terms of improving stainability that the adhesive layer 20 is made of a thermoplastic urethane resin having a wet tension of 70 mN / m or more, that the constituent fibers of the nonwoven fabric layer 30 are rayon fibers having a wet tension of 70 mN / m or more, and that the resin forming the transparency improving layer 40 is also a resin having a wet tension of 70 mN / m or more.

[0050] Furthermore, the above-mentioned resin forming the transparency improving layer 40 in this embodiment can be used as a resin composition in which additives such as colorants such as pigments and dyes, ultraviolet absorbers, weather resistance agents such as light stabilizers, extender pigments, solvents, stabilizers, plasticizers, catalysts, curing agents, etc. are appropriately mixed. That is, the transparency improving layer 40 can be formed from a resin composition containing additives in addition to the above-mentioned resin.

[0051] 1 to 3, the transparency improving layer 40 may be present in the form of a layer with a certain thickness on the surface 30b, or may be present so as to cover the outermost fibers along the surface 30b of the nonwoven fabric layer 30. Either embodiment is acceptable, but from the viewpoint of improving transparency, touch, and stainability, it is sufficient that the transparency improving layer 40 is present on at least a portion of the surface on the front side of the decorative sheet, and it may be present so as to cover at least a portion of the outermost fibers, or may be present so as to cover the entire surface.

[0052] When the transparency improving layer 40 is present in a layered form, it is preferable that it is present on a part of the surface of the stainable decorative sheet of this embodiment, from the viewpoint of ensuring the ink-receptive property of colorants such as water-based stain paints and oil-based stain paints and obtaining excellent stainability. Also, when it is present so as to cover the fibers of the outermost surface, it is preferable that there are at least partial voids formed by the fibers of the outermost surface and its vicinity (near the nonwoven fabric layer 30 in the thickness direction) from the viewpoint of ensuring the ink-receptive property and obtaining excellent stainability. Thus, regardless of the form in which the transparency improving layer 40 is present, in order to ensure the inking ability of colorants such as water-based stain paints and oil-based stain paints and to obtain excellent stainability, it is preferable that there are voids formed between fibers, at least in part of whose surfaces may be coated with resin, at the outermost surface and its vicinity (nearby in the thickness direction within the layer of the nonwoven fabric layer 30).

[0053] The thickness of the transparency improving layer 40 may be determined mainly by considering the balance of the filling portion B33, the fiber portion 32, and the filling portion A31 in the nonwoven fabric layer 30 in addition to the thickness of the transparency improving layer 40. From the viewpoint of forming the filling portion A31, the filling portion B33, and the fiber portion 32 in a well-balanced manner and improving the surface texture, stainability, and transparency in a well-balanced manner, the total thickness of the transparency improving layer 40 and the filling portion B33 is preferably 0.5 μm or more, more preferably 1 μm or more, and even more preferably 2 μm or more, and the upper limit is preferably 10 μm or less, more preferably 8 μm or less, and even more preferably 6 μm or less. The total thickness of the transparency improving layer 40 and the filling portion B33 is the average value of the measured values ​​measured by the same method as the total thickness of the adhesive layer 20 and the filling portion A31.

[0054] (Decorative layer 50) From the viewpoint of improving design, the stainable decorative sheet of the present embodiment preferably has a decorative layer 50. The decorative layer 50 may be provided between the paper base material 10 and the nonwoven fabric layer 30, and is preferably provided between the paper base material 10 and the adhesive layer 20. The decorative layer 50 may be a layer consisting of only the full-colored layer 51 provided to cover the front surface, a layer consisting of only the pattern layer 52 provided to cover a portion of the front surface and form a pattern, or a layer consisting of a combination of the full-colored layer 51 and the pattern layer 52. These layer configurations may be determined according to the desired pattern.

[0055] The pattern imparted by the decorative layer 50 is not particularly limited and may be selected as desired, and examples thereof include wood grain patterns, marble patterns (e.g., travertine marble patterns), stone grain patterns imitating the surface of rocks such as the cleavage plane of a granite slab, fabric patterns imitating fabric grain or cloth-like patterns, leather (leather grain) patterns expressing leather grain, tile patterns, brick masonry patterns, hairlines, linear grooves, pear-skin, sand grain, letters, symbols, geometric patterns, and patterns combining these, such as marquetry and patchwork. In addition, examples of patterns combining these include artificial stone patterns made by mixing crushed stone such as marble with white cement, hardening it, and polishing it to look like marble, i.e., so-called artificial marble. Although the design demands of consumers change with fashion and the like, wood grain patterns remain popular, and therefore wood grain patterns are preferred for the pattern of the stainable decorative sheet of this embodiment. Wood grain patterns include straight grain patterns, cross grain patterns, figured grain patterns, end grain patterns, etc., and any of these may be used.

[0056] The decorative layer 50 is preferably formed using a resin composition containing at least a binder resin and a colorant such as a pigment and a dye, and can be formed by appropriately mixing other components used as desired, such as a matting agent, an extender pigment, a stabilizer, a solvent, and weathering agents such as an ultraviolet absorber and a light stabilizer. In other words, the decorative layer is a layer that contains at least a binder resin and a colorant such as a pigment and a dye, and can contain other components used as desired as described above.

[0057] The binder resin is not particularly limited, and examples thereof include urethane resin, acrylic polyol resin, acrylic resin, polyester resin, alkyd resin, amide resin, butyral resin, styrene resin, urethane-acrylic copolymer, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate-acrylic copolymer resin, nitrocellulose resin (nitrocellulose), cellulose acetate resin, and other resins. In addition, curable resins such as two-component curable resins that use various polyols such as acrylic polyols as the main component and various isocyanates as the curing agent may be used. These may be used alone or in combination.

[0058] The colorant can be appropriately selected from known pigments, such as inorganic pigments such as titanium white, lead white, carbon black, iron black, yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine blue, and cobalt blue; organic pigments or dyes such as quinacridone red, isoindolinone yellow, nickel azo complex, and phthalocyanine blue; metal pigments consisting of scaly foil flakes of aluminum, brass, and the like; and pearlescent pigments consisting of scaly foil flakes of titanium dioxide-coated mica, basic lead carbonate, and the like.

[0059] From the viewpoint of further improving the design, the decorative layer 50 preferably contains a matting agent among the other components that are used as desired. Examples of the matting agent include inorganic fillers such as silica, clay, heavy calcium carbonate, light calcium carbonate, precipitated barium sulfate, calcium silicate, synthetic silicate, and silicic acid fine powder; and organic fillers such as acrylic resin, urethane resin, nylon resin, polypropylene resin, and urea resin.

[0060] By including a matte agent in the decorative layer 50, the decorative layer has a lower gloss, making it possible to achieve a design expression having a visual uneven feel due to differences in gloss. For example, the wood grain pattern exemplified as a preferred pattern has a lower gloss (matte or low gloss) vascular part, a higher gloss (glossy or high gloss) spring wood part, and an even higher gloss autumn wood part (shiny part). In the decorative layer 50, a highly designed pattern can be formed by combining multiple pattern layers 52, such as a pattern layer forming a lower gloss vascular part, a pattern layer forming a higher gloss spring wood part, and a pattern layer forming an even higher gloss autumn wood part. In this case, for example, by not including a matting agent in the full colored layer 51 or by including a smaller amount of matting agent in the full colored layer 51 than in the pattern layer 52, the difference in gloss from the pattern layer 52 can be increased, thereby improving the design.

[0061] The thickness of the decorative layer 50 is not particularly limited, but from the viewpoint of improving the design, it is preferably 0.1 μm or more, more preferably 0.5 μm or more, and even more preferably 1 μm or more, and the upper limit is preferably 10 μm or less, more preferably 9 μm or less, and even more preferably 7.5 μm or less. When the decorative layer 50 is formed of two or more layers, it is preferable that the total thickness of the layers is within the above range.

[0062] (Method of manufacturing stainable decorative sheet) The manufacturing method of the stainable decorative sheet 1 of this embodiment will be explained by taking as an example the stainable decorative sheet 1 shown in FIG. 2 (and FIG. 3), which is one of the preferred embodiments of the stainable decorative sheet 1 of this embodiment. The stainable decorative sheet 1 of this embodiment shown in Figure 2 (and Figure 3) can be manufactured through step 1 of providing a decorative layer 50 on a paper base material 10, step 2 of providing an adhesive layer 20 on the decorative layer 50, step 3 of providing a nonwoven fabric layer 30 and a filling portion A31 on the adhesive layer 20, and step 4 of applying a resin composition that forms a transparency improving layer 40 to the surface of the nonwoven fabric layer 30, and forming the filling portion B33 together with the transparency improving layer 40.

[0063] Step 1 is to provide a decorative layer 50 on a paper substrate 10 . The decorative layer 50 is preferably formed by printing the resin composition used to form the decorative layer 50 using gravure printing, silk screen printing, gravure offset printing, flexographic printing, ink jet printing, or the like, and it is more preferable to use gravure printing in the case of large lots and ink jet printing in the case of small lots.

[0064] Step 2 is a step of providing an adhesive layer 20 on the decorative layer 50 . For example, a resin composition, preferably containing a urethane resin, is appropriately selected from the resins exemplified as resins capable of forming the adhesive layer 20 and applied onto the decorative layer 50 to form the adhesive layer 20. In this case, the method for applying the resin composition may be selected from any of the known methods exemplified as the method for applying the resin composition in the decorative layer 50.

[0065] In this case, the coating amount (dry base) of the resin composition forming the adhesive layer 20 is preferably 2 g / m from the viewpoint of obtaining excellent adhesiveness, forming the filler A 31, the filler B 33, and the fiber portion 32 in a balanced manner, and improving the stainability and transparency in a balanced manner. 2 More preferably, 5 g / m 2 More preferably, 8 g / m 2 More preferably, 10 g / m2 The upper limit is preferably 50 g / m 2 Less than 45g / m 2 More preferably, 40 g / m 2 More preferably, 30 g / m or less 2 The following is the result.

[0066] Step 3 is a step of providing the nonwoven fabric layer 30 and the filling portion A31 on the adhesive layer 20. The nonwoven fabric layer 30 and the filling portion A31 are formed, for example, by forming an adhesive layer 20 by applying a resin composition, placing a nonwoven fabric on top of the adhesive layer, and then dry laminating and thermocompressing the layers to form the nonwoven fabric layer 30. The resin composition used to form the adhesive layer is then filled into some of the voids in the nonwoven fabric to form the filling portion A31.

[0067] The nonwoven fabric layer 30 and the filling portion A31 can also be formed together with the adhesive layer 20. For example, the adhesive layer 20 can be appropriately selected from the resins exemplified as those capable of forming the adhesive layer 20, and preferably a polyolefin resin can be melt-extruded to place the adhesive layer-forming resin, place a nonwoven fabric on top of it, and then extrusion laminate (sand laminate) to form the adhesive layer 20 together with the filled portion A31 in which the adhesive layer-forming resin has filled some of the voids in the nonwoven fabric, and the nonwoven fabric layer 30.

[0068] In this case, the thickness of the adhesive layer-forming resin is preferably 10% or more, more preferably 12% or more, and even more preferably 14% or more of the thickness of the nonwoven fabric layer 30, from the viewpoint of obtaining excellent adhesion between the paper base material 10 and the nonwoven fabric layer 30, and from the viewpoint of forming the filling portion A31, the filling portion B33, and the fiber portion 32 in a balanced manner and improving the stainability and transparency in a balanced manner, and the upper limit is preferably 25% or less, more preferably 23% or less, and even more preferably 20% or less.

[0069] Step 4 is a step of applying a resin composition for forming the transparency improving layer 40 onto the surface of the nonwoven fabric layer 30, thereby forming the transparency improving layer 40 and the filling portion B33. The resin composition that forms the transparency improving layer 40 may be applied by selecting any of the known methods exemplified as the method for applying the resin composition in the decorative layer 50. In forming the transparency improving layer 40, the amount of resin composition to be applied may be determined mainly in consideration of the thickness of the transparency improving layer 40 as well as the balance between the filling portion B33, the fiber portion 32, and the filling portion A31 in the nonwoven fabric layer 30, and the like. From the viewpoint of forming the filling portion A31, the filling portion B33, and the fiber portion 32 in a balanced manner and improving the tactile feel, stainability, and transparency of the surface in a balanced manner, the amount of resin composition to be applied is usually 1 g / m 2 More than 2g / m 2 More preferably, 4 g / m 2 The upper limit is preferably 15 g / m 2 Less than 12 g / m, more preferably 2 More preferably, 10 g / m 2 The following is the result.

[0070] By the above steps, a stainable decorative sheet 1 having a preferred embodiment shown in Figure 2 can be produced, which has, in order, a paper base material 10, a decorative layer 50, an adhesive layer 20, a nonwoven fabric layer 30 (filling portion A31, fiber portion 32, filling portion B33), and a transparency improving layer 40.

[0071] [Method of coloring stainable decorative sheet] The method for coloring the stainable decorative sheet of this embodiment is characterized in that a colorant is applied to the transparency improving layer side of the stainable decorative sheet of this embodiment described above, thereby coloring the nonwoven fabric layer. The stainable decorative sheet 1 of this embodiment has a nonwoven fabric layer 30, which ensures ink-receptive properties that allow colorants such as water-based stain paint and oil-based stain paint to penetrate into the voids in the fibers. In addition, the stainable decorative sheet 1 has an adhesive layer 20 between the paper base material 10 and the nonwoven fabric layer 30, and the adhesive layer 20 imparts water resistance and solvent resistance, so that even when applied to the nonwoven fabric layer 30, the physical properties of the paper base material 10 can be prevented from being affected. EXAMPLES

[0072] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples in any way.

[0073] (Evaluation method) The decorative sheets obtained in the respective Examples and Comparative Examples were evaluated as follows. <Evaluation of Adhesion> The decorative sheets obtained in each of the Examples and Comparative Examples were cut to a size of 300 mm x 300 mm to prepare test pieces for adhesive strength tests. A 25 mm wide cellophane adhesive tape (manufactured by Nichiban Co., Ltd., product name "Cellotape (registered trademark)") was applied to the nonwoven fabric layer side of the test piece and then peeled off to evaluate adhesiveness. In this evaluation, a rating of A is a pass. In this and other evaluations, when "+" or "-" is added in addition to the A to D ratings, for example, "B" is used. + " indicates that the product is better than the B grade but not as good as the A grade. For example, "B - " indicates that the rating is inferior to a B rating but better than a C rating. A: No peeling occurred within the nonwoven fabric layer or between the nonwoven fabric layer and the adhesive layer. C: Peeling occurred within the nonwoven fabric layer or between the nonwoven fabric layer and the adhesive layer.

[0074] <Evaluation of appearance transparency> The decorative sheets obtained in each of the Examples and Comparative Examples were evaluated for their appearance according to the following criteria. In this evaluation, a rating of B or higher is acceptable. A: There was absolutely no deterioration in transparency of the appearance, and the design was excellent. B: Almost no deterioration in transparency was observed in appearance, and no practical problems were observed. C: Deterioration in transparency of appearance was confirmed, and design property was deteriorated.

[0075] <Evaluation of Staynability> The decorative sheets obtained in each of the Examples and Comparative Examples were coated on the transparency improving layer side with an oil-based stain paint, and stainability was evaluated. In this evaluation, an A rating is a pass. A: Excellent coloring with oil-based stain paint, with little or no deterioration in the physical properties of the decorative sheet. C: The coloring of the oil-based stain paint is good, but the fuzziness of the nonwoven fabric fibers is noticeable and the design is not excellent. D: Oil-based stain paint could not be applied and / or the physical properties of the decorative sheet were deteriorated.

[0076] (Measurement method) <Wetting tension measurement> In an atmosphere of 23°C (relative humidity: 50%), the resin composition used to form the layer was applied to a support (thickness: 25 μm, material: PET resin) for measuring wet tension at a coating amount of 8 g / m 2 After forming a layer by applying a coating of 1000g / cm2, a wetting tension measuring pen ("Tension Checker TC-B-70 (dyne number: 70)" manufactured by Pacific Chemical Co., Ltd.) was applied onto the layer, and the state of the liquid film after 3 seconds was visually observed to confirm whether the liquid film had broken or shrunk. If no break or shrinkage occurred, this indicates that the wetting tension was 70 mN / m or more. Further, for the nonwoven fabric forming the nonwoven fabric layer, the wet tension was measured in the same manner as above, except that the wet tension measuring pen was applied to the surface of the nonwoven fabric.

[0077] Example 1 Printing paper ("HPT30 (product number)" manufactured by Hokuetsu Kishu Paper Co., Ltd., thickness: 60 μm, basis weight: 45 g / m) was used as the paper base material. 2 ) was prepared, and a decorative layer exhibiting a wood grain pattern was formed on the printing paper by gravure printing using an ink containing an acrylic resin as a binder resin and a pigment (an ink containing a 1:1 mass ratio mixture of vinyl chloride-vinyl acetate copolymer resin and acrylic resin as a binder, and carbon black as a pigment) (thickness: 2 to 6 μm). Next, a resin composition for forming an adhesive layer (urethane resin, base agent: polyester polyol ("Seikabond E-295NTL-D50 (product name)", Dainichiseika Color & Chemicals Mfg. Co., Ltd.), isocyanate-based hardener ("Seikabond C-55 (product name)", Dainichiseika Color & Chemicals Mfg. Co., Ltd.) was gravure printed at 12 g / m on the decorative layer. 2 (dry base) to provide an adhesive layer (thickness: 12 μm). Separately, a nonwoven fabric made of rayon fiber ("3016 (product number)" manufactured by Kinsei Paper Co., Ltd., thickness: 80 μm, basis weight: 17 g / m) was used. 2 ) was prepared, and the paper base material on which the decorative layer and adhesive layer were formed was dry laminated with a nonwoven fabric to obtain a laminate having a paper base material, a decorative layer, an adhesive layer, and a nonwoven fabric layer consisting of a filling portion A and a fiber portion. Next, a resin composition containing a one-component curing type acrylic polyol resin as a resin for forming a transparency improving layer was applied to the fiber part side of the laminate in an amount of 8 g / m 2 (dry base) to form the filling portion B and the transparency improving layer, thereby obtaining a stainable decorative sheet having a paper base material, a decorative layer, an adhesive layer, the filling portion A, a nonwoven fabric layer consisting of the fiber portion and the filling portion B, and the transparency improving layer. The stainable decorative sheet thus obtained was evaluated by the above-mentioned methods, and the results are shown in Table 1.

[0078] Example 2 In Example 1, the coating amount for forming the adhesive layer was 16 g / m 2 (dry base), and the coating amount when forming the transparency improving layer was 5 g / m 2 A stainable decorative sheet was obtained in the same manner as in Example 1, except that the composition was changed to (dry base). The stainable decorative sheet thus obtained was evaluated by the above-mentioned methods, and the results are shown in Table 1.

[0079] Example 3 Printing paper ("HPT30 (product number)" manufactured by Hokuetsu Kishu Paper Co., Ltd., thickness: 60 μm, basis weight: 45 g / m) was used as the paper base material. 2 ) was prepared, and a decorative layer with a wood grain pattern was formed on the printing paper by gravure printing using an ink containing an acrylic resin as a binder resin and a pigment (an ink containing a 1:1 mass ratio mixture of vinyl chloride-vinyl acetate copolymer resin and acrylic resin as a binder, and carbon black as a pigment) (thickness: 2 to 6 μm). Next, a resin composition for forming an adhesive layer (thermoplastic urethane resin, adjusted so that the wetting tension is 70 mN / m or more, glass transition temperature: -45°C) was used to gravure print 5 g / m2 (dry base) to provide an adhesive layer (thickness: 5 μm). Separately, a nonwoven fabric made of rayon fiber ("3016 (product number)" manufactured by Kinsei Paper Co., Ltd., thickness: 80 μm, basis weight: 17 g / m) was used. 2 ) was prepared, and the paper base material on which the decorative layer and adhesive layer were formed was laminated by thermocompression with a nonwoven fabric to obtain a laminate having a paper base material, a decorative layer, an adhesive layer, and a nonwoven fabric layer consisting of a filling portion A and a fiber portion. Next, a composition containing 100 parts by mass of an acrylic polyol resin (hydroxyl value: 41 mgKOH / g) and 5 parts by mass of an isocyanate-based curing agent (hexamethylene diisocyanate, isocyanate group content: 19% by mass) was applied in an amount of 12 g / m on the fiber side of the laminate as a resin composition for forming a transparency improving layer. 2 (dry base) to form the filling portion B and the transparency improving layer, thereby obtaining a stainable decorative sheet having a paper base material, a decorative layer, an adhesive layer, the filling portion A, a nonwoven fabric layer consisting of the fiber portion and the filling portion B, and the transparency improving layer. The stainable decorative sheet thus obtained was evaluated by the above-mentioned methods, and the results are shown in Table 1. Furthermore, when the wet tension of the resin composition forming the adhesive layer, the resin composition forming the transparency improving layer, and the nonwoven fabric was measured by the above-mentioned method, all were 70 mN / m or more.

[0080] Comparative Example 1 In Example 2, the coating amount for forming the adhesive layer was 24 g / m 2 A decorative sheet was obtained in the same manner as in Example 2, except that the composition was changed to (dry base). The decorative sheet thus obtained was evaluated by the above-mentioned methods, and the results are shown in Table 1.

[0081] [Table 1]

[0082] From the results of the examples, it was confirmed that the stainable decorative sheet of this embodiment is excellent in all respects, including adhesion, transparency, and stainability. In addition, in Example 3, by using a thermoplastic urethane resin in the adhesive layer, adhesion was slightly decreased compared to Examples 1 and 2, but stainability was improved. On the other hand, in the decorative sheet of Comparative Example 1, the nonwoven fabric layer was entirely filled with the resin forming the adhesive layer, and the sheet was unable to exhibit stainability. [Industrial Applicability]

[0083] The stainable decorative sheet of this embodiment has good adhesion between the paper base material and the nonwoven fabric, good surface feel and stainability, and excellent transparency, so it is suitable for use as interior or exterior components of buildings such as walls, ceilings, and floors, building fixtures and fittings such as window frames, doors, handrails, baseboards, moldings, and other building materials, as well as surface decorative panels for kitchen equipment, furniture, or cabinets for low-voltage and office equipment, and as a layer constituting the interior or exterior components of vehicles. [Explanation of symbols]

[0084] 1: Stainable decorative sheet 10:Paper base material 20: Adhesive layer 30: Non-woven fabric layer 31, 33: Filling section 32: Fiber section 40: Transparency improvement layer 50: Picture layer

Claims

1. A paper substrate; An adhesive layer provided on at least one surface side of the paper base material; A nonwoven fabric layer provided on the other side of the adhesive layer on the side opposite to the side on which the paper base material is provided; a transparency improving layer provided on the other side of the nonwoven fabric layer opposite to the side on which the adhesive layer is provided; Equipped with The resin composition forming the transparency improving layer has a wetting tension of 70 mN / m or more, the resin forming the transparency improving layer is at least one resin selected from an acrylic resin, an acrylic polyol resin, and a urethane resin, The nonwoven fabric layer partially has a filled portion A on the side of the layer in the thickness direction where the adhesive layer is provided, in which a resin forming the adhesive layer is filled into a part of the voids of the fibers constituting the nonwoven fabric layer, and a filled portion B on the side of the layer in the thickness direction where the transparency improving layer is provided, in which a resin forming the transparency improving layer is filled into a part of the voids of the fibers constituting the nonwoven fabric layer. Stainable decorative sheet.

2. 2. The stainable decorative sheet according to claim 1, wherein said nonwoven fabric layer is made of at least one type of fiber selected from thermoplastic resin fibers and recycled fibers.

3. 3. The stainable decorative sheet according to claim 1, wherein the resin forming the adhesive layer is at least one resin selected from the group consisting of urethane resins and polyolefin resins.

4. The stainable decorative sheet according to any one of claims 1 to 3, further comprising a decorative layer between said paper substrate and said adhesive layer.

5. 5. The stainable decorative sheet according to claim 4, wherein said decorative layer exhibits a wood grain pattern.

6. A method for coloring a decorative sheet, comprising applying a colorant to said transparency improving layer side of the stainable decorative sheet according to any one of claims 1 to 5, thereby coloring said nonwoven fabric layer.

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