Decorative sheet, decorative material, and method for producing decorative sheet

Abstract

To provide a decorative sheet, a decorative material, and a method for producing a decorative sheet, which are capable of suppressing fading even in use for building materials.SOLUTION: A decorative sheet 10 comprises: a film-shaped substrate 11; a pattern layer 12 disposed on one side of the substrate 11; and a film-shaped transparent layer 13 disposed on one side of the pattern layer 12 so as to sandwich the pattern layer 12 between the substrate 11 and the transparent layer 13, where the pattern layer 12 is composed of an aggregate of dots containing a diketopyrrolopyrrole skeleton pigment.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a decorative sheet and decorative material for use in building decoration materials and the like, and a method for producing a decorative sheet. [Background technology]

[0002] In decorative sheets used for building materials, etc., a picture layer such as a pattern is printed on a substrate, and a transparent layer is provided on the surface. Conventionally, the picture layer on such decorative sheets has been provided by gravure printing, but in recent years, in order to enable the production of a wide variety of products in small lots, the picture layer has come to be provided by inkjet printing without a printing plate (for example, see Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-071447 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the inkjet printing described above, for example, Pigment Red 150 (CI 12290) shown in the following chemical formula (1) is used as an ink pigment with good color development.

[0005] [ka]

[0006] However, Pigment Red 150 has a problem in that it has poor weather resistance and gradually fades when applied to decorative sheets for building materials.

[0007] In view of the above, an object of the present invention is to provide a decorative sheet and decorative material that can suppress discoloration even when used as a building decoration material, as well as a method for producing a decorative sheet. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the decorative sheet of the present invention is a decorative sheet comprising a film-shaped substrate, a pattern layer provided on one side of the substrate, and a film-shaped transparent layer provided on one side of the pattern layer so as to sandwich the pattern layer between the substrate and the pattern layer, wherein the pattern layer is composed of an aggregate of dots containing a diketopyrrolopyrrole skeleton pigment.

[0009] In addition, in the decorative sheet of the present invention, in the above-mentioned decorative sheet, it is preferable that the diketopyrrolopyrrole skeleton pigment is at least one of unsubstituted diketopyrrolopyrrole red, dichlorodiketopyrrolopyrrole red, dimethyldiketopyrrolopyrrole red, diphenyldiketopyrrolopyrrole red, dicyanodiketopyrrolopyrrole orange, and dibutyldiketopyrrolopyrrole orange.

[0010] In the decorative sheet according to the present invention, the median diameter of the diketopyrrolopyrrole skeleton pigment is preferably 40 nm or more and 300 nm or less.

[0011] In the decorative sheet according to the present invention, it is preferable that the base material in the decorative sheet described above is made of at least one material selected from the group consisting of resin, paper, wood, metal, and glass.

[0012] In the decorative sheet according to the present invention, it is preferable that the transparent layer in the decorative sheet described above is made of a transparent resin.

[0013] In addition, the decorative sheet according to the present invention is preferably the decorative sheet described above, further comprising an ink-receiving layer containing a urethane resin between the substrate and the design layer.

[0014] In addition, the decorative sheet according to the present invention is preferably the decorative sheet described above, further comprising an adhesive layer provided between the design layer and the transparent layer.

[0015] On the other hand, in order to solve the above-mentioned problems, the decorative material of the present invention is characterized in that it comprises the above-mentioned decorative sheet and a substrate having one side attached to the other side of the base material of the decorative sheet.

[0016] Furthermore, in order to solve the above-mentioned problems, the manufacturing method for decorative sheet according to the present invention is a method for manufacturing the above-mentioned decorative sheet, characterized in that it includes a pattern layer forming process in which an ink for inkjet printing containing the diketopyrrolopyrrole skeleton pigment is sprayed onto one side of the substrate by an inkjet printing method to provide the pattern layer in which a pattern is formed by the aggregate of dots, and a transparent layer bonding process in which the transparent layer in a film form is disposed on one side of the substrate to sandwich the pattern layer and bonded between the substrate and the transparent layer.

[0017] Furthermore, the method for producing a decorative sheet according to the present invention is the method for producing a decorative sheet described above, and it is preferable that the viscosity of the ink at 30°C is 2 mPa·s or more and 10 mPa·s or less, and the surface tension is more than 0 mN / m and less than 70 mN / m.

[0018] In addition, the method for manufacturing a decorative sheet according to the present invention is the method for manufacturing a decorative sheet described above, and it is preferable that an ink-receiving layer forming process for providing an ink-receiving layer that receives the ink on one side of the base material is carried out prior to the pattern layer forming process.

[0019] In addition, the manufacturing method of the decorative sheet of the present invention is a manufacturing method of the decorative sheet described above, and it is preferable that an adhesive layer formation process for providing an adhesive layer on one side of the base material on which the pattern layer is provided is performed between the pattern layer formation process and the transparent layer bonding process. Effect of the Invention

[0020] According to the present invention, since the pattern layer is composed of an aggregate of dots containing a pigment having a diketopyrrolopyrrole skeleton, the pigment has high weather resistance, and a pattern layer capable of significantly suppressing fading can be provided by inkjet printing. Therefore, even when used in building decoration materials, fading can be significantly suppressed. [Brief description of the drawings]

[0021] [Figure 1] 1 is a cross-sectional view showing a schematic structure of a main embodiment of a decorative sheet according to the present invention. [Diagram 2] 1 is a cross-sectional view showing a schematic structure of a main embodiment of a decorative material according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] The following describes embodiments of the decorative sheet, decorative material, and method for manufacturing the decorative sheet according to the present invention with reference to the drawings. Note that the present invention is not limited to the following embodiments described with reference to the drawings, and various technical matters described in each embodiment can be appropriately combined or replaced as necessary.

[0023] [Decorative sheet / Main embodiment] A main embodiment of the decorative sheet and its manufacturing method according to the present invention will be described with reference to FIG.

[0024] <Overall structure of decorative sheet> As shown in Fig. 1, a pattern layer 12 having a pattern such as wood grain is provided on one side (the upper side in Fig. 1) of a film-shaped substrate 11 made of a thermoplastic resin. A film-shaped transparent layer 13 made of a transparent resin material is provided on one side (the upper side in Fig. 1) of the pattern layer 12 so as to sandwich the pattern layer 12 between the substrate 11 and the transparent layer 13. The decorative sheet 10 according to this embodiment will now be described in more detail.

[0025] <Base material 11> A film in which various additives are mixed into a thermoplastic resin is applied as the substrate 11. There are no particular limitations on the thermoplastic resin constituting the substrate 11, and materials similar to the thermoplastic resins used as substrates in conventional decorative sheets can be used.

[0026] Specific examples of thermoplastic resins include polyolefin resins such as polyethylene, polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, ethylene-α-olefin copolymer, and propylene-α-olefin copolymer; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytetramethylene terephthalate, polyethylene naphthalate, polyethylene terephthalate-isophthalate copolymer, 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate, polyarylate, and polycarbonate; olefins such as ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-(meth)acrylic acid (ester) copolymer, and ethylene-unsaturated carboxylic acid copolymer metal neutralized product (ionomer); Examples of the resin include polyolefin-based resins such as poly(meth)acrylonitrile, polymethyl(meth)acrylate, polyethyl(meth)acrylate, polybutyl(meth)acrylate, polyacrylamide, and other acrylic resins, polyamide-based resins such as 6-nylon, 6,6-nylon, and 6,10-nylon, styrene-based resins such as polystyrene, AS resin, and ABS resin, vinyl-based resins such as polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, and polyvinyl butyral, fluorine-based resins such as polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, and ethylene-perfluoroalkyl vinyl ether copolymer, and mixtures, copolymers, composites, and laminates of two or more of these resins.

[0027] In order to improve various properties as required, various additives such as heat stabilizers, light stabilizers, light absorbers, lubricants, plasticizers, inorganic fillers, colorants, pigments, etc. are appropriately mixed into the base material 11. In particular, when shielding properties are required, it is preferable to mix an inorganic pigment such as titanium oxide.

[0028] <Pattern layer 12> The pattern layer 12 is formed as a collection of circular dots by spraying ink for inkjet printing, in which a pigment is dispersed in a solvent, onto one side of the substrate 11 by inkjet printing. The ink preferably has a viscosity of 2 mPa·s or more and 10 mPa·s or less at 30°C and a surface tension of more than 0 mN / m and less than 70 mN / m. The ink contains, as the pigment, a diketopyrrolopyrrole (DPP) skeleton pigment having a diketopyrrolopyrrole (DPP) structure shown in the following chemical formula (2) as the basic skeleton.

[0029] [ka]

[0030] Examples of the DPP skeleton pigment include unsubstituted DPP Red (Pigment Red 255 / CI561050) shown in the following chemical formula (3), dichloro DPP Red (Pigment Red 254 / CI56110) shown in the following chemical formula (4), dimethyl DPP Red (Pigment Red 272 / CI561150) shown in the following chemical formula (5), diphenyl DPP Red (Pigment Red 264 / CI561300) shown in the following chemical formula (6), dicyano DPP Orange (Pigment Orange 71 / CI561200) shown in the following chemical formula (7), and dibutyl DPP Orange (Pigment Orange 73 / CI561170) shown in the following chemical formula (8). The inkjet ink contains at least one of these.

[0031] [ka]

[0032] [ka]

[0033] [ka]

[0034] [ka]

[0035] [ka]

[0036] [ka]

[0037] The DPP skeleton pigment preferably has a median diameter of 40 nm or more and 300 nm or less.

[0038] <Transparent layer 13> A film in which various additives are mixed into a transparent resin is applied as the transparent layer 13. There are no particular limitations on the resin constituting the transparent layer 13, and the same material as that used for the transparent resin layer provided on the picture layer of a conventional decorative sheet can be used.

[0039] Specific examples of the resin include polyolefin resins such as polyethylene, polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, ethylene-α-olefin copolymer, and propylene-α-olefin copolymer; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytetramethylene terephthalate, polyethylene naphthalate, polyethylene terephthalate-isophthalate copolymer, 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate, polyarylate, and polycarbonate; and olefin copolymers such as ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-(meth)acrylic acid (ester) copolymer, and ethylene-unsaturated carboxylic acid copolymer metal neutralized product (ionomer). Examples of the thermoplastic resin include polyolefin resins such as resins, acrylic resins such as poly(meth)acrylonitrile, polymethyl(meth)acrylate, polyethyl(meth)acrylate, polybutyl(meth)acrylate, and polyacrylamide, polyamide resins such as 6-nylon, 6,6-nylon, and 6,10-nylon, styrene resins such as polystyrene, AS resin, and ABS resin, vinyl resins such as polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, and polyvinyl butyral, fluorine-based resins such as polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, and ethylene-perfluoroalkyl vinyl ether copolymer, and mixtures, copolymers, composites, and laminates of two or more of these.

[0040] In order to improve various properties as required, various additives such as ultraviolet absorbers, antioxidants, heat stabilizers, flame retardants, antiblocking agents, catalyst accelerators, colorants, light scattering agents, gloss adjusters, etc. are appropriately mixed into the transparent layer 13. In particular, in order to improve weather resistance, it is preferable to mix an ultraviolet absorber.

[0041] The decorative sheet 10 according to this embodiment can be manufactured as follows. First, a film-shaped substrate 11 is prepared, and ink for inkjet printing is sprayed onto one side of the substrate 11 by inkjet printing to print a pattern layer 12 having a pattern formed of a collection of circular dots (pattern layer forming step). Next, a film-shaped transparent layer 13 is disposed on one side of the pattern layer 12, which is one side of the substrate 11, and the substrate 11 and the transparent layer 13 are bonded and joined by thermocompression or the like so as to sandwich the pattern layer 12 (transparent layer joining step). This allows the decorative sheet 10 to be obtained.

[0042] The decorative sheet 10 according to this embodiment produced in this manner has a pattern layer 12 consisting of an aggregate of dots containing a DPP skeleton pigment. Therefore, even when used in building decoration materials, the pigment has high weather resistance, and the pattern layer 12 can be provided by inkjet printing, which can significantly suppress fading.

[0043] Therefore, according to the decorative sheet 10 and the manufacturing method thereof according to this embodiment, discoloration can be significantly suppressed even when used as a building decoration material.

[0044] [Cosmetic material / Main embodiment] A main embodiment of the decorative material according to the present invention will be described with reference to Fig. 2. However, for parts similar to those in the previously described embodiment, the same reference numerals as those used in the description of the previously described embodiment will be used, and descriptions that overlap with those in the previously described embodiment will be omitted.

[0045] <Overall composition of decorative material> As shown in Fig. 2, the decorative material 100 comprises a decorative sheet 10 and a substrate 101 having one side (upper side in Fig. 2) attached to the other side (lower side in Fig. 2) of a base material 11 of the decorative sheet 10. In the decorative material 100, the substrate 101 is attached to the base material 11 of the decorative sheet 10 via an adhesive layer 102. In other words, the decorative material 100 according to this embodiment is obtained by attaching the decorative sheet 10 according to the first embodiment to the substrate 101.

[0046] <Substrate 101> The substrate 101 is made of a wood-based material such as wood plywood. Examples of wood-based materials that can be used include tropical wood plywood, particle board, medium density fiberboard (MDF), and ordinary plywood as specified by the Japanese Agricultural Standards (JAS).

[0047] <Adhesive layer 102> The adhesive layer 102 is provided on the other side of the substrate 101 in order to attach the decorative sheet 10 to the substrate 101. When the substrate 101 is made of a wood-based material, an emulsion-type vinyl acetate-based adhesive, a two-component curing urethane-based adhesive, or the like is generally applied as the adhesive layer 102.

[0048] Therefore, in the decorative material 100 according to this embodiment, similar to the decorative sheet 10 according to the embodiment described above, discoloration can be significantly suppressed even when used as a building decoration material.

[0049] [Decorative sheet / other embodiments] In the above-mentioned embodiment, the decorative sheet 10 is applied with the substrate 11 made of thermoplastic resin, but the present invention is not limited thereto. As another embodiment, for example, it is possible to apply other resins such as thermosetting resins, as well as paper, wood, metal, glass, etc. to the substrate. In this case, for example, when titanium paper, which is paper with titanium dioxide embedded therein, is applied to the substrate, it is preferable to form a transparent layer by applying a transparent thermosetting resin such as melamine resin to the substrate provided with a pattern layer and heating and curing it.

[0050] In the above embodiment, the decorative sheet 10 is composed of three layers, the substrate 11, the pattern layer 12, and the transparent layer 13, but the present invention is not limited thereto. As another embodiment, for example, an ink-receiving layer containing a urethane resin containing calcium carbonate or the like and having excellent ink adhesion for the pattern layer is provided on one side of the substrate (ink-receiving layer forming step), and then a pattern layer is provided on the ink-receiving layer, that is, the ink-receiving layer forming step can be performed prior to the pattern layer forming step, as necessary. Also, for example, a transparent adhesive layer having excellent adhesion to the ink of the pattern layer is provided on one side of the substrate on which the pattern layer is provided (adhesive layer forming step), and then a transparent layer is provided on the adhesive layer, that is, the adhesive forming step can be performed between the pattern layer forming step and the transparent layer bonding step, as necessary. EXAMPLES

[0051] Examples conducted to confirm the effects of the decorative sheet and decorative material, and the manufacturing method for the decorative sheet, according to the present invention, will be described in detail below, but the present invention is not limited to the following examples.

[0052] [Preparation of test specimens and comparison specimens] Test specimen 1 On one side of a film-shaped (50μm thick) substrate made of polyvinyl chloride resin, ink (viscosity 2mPa·s at 30℃, surface tension 50mN / m) prepared for inkjet printing using unsubstituted DPP red (pigment red 255 / CI561050) (median diameter 40nm) as a pigment was sprayed by inkjet printing to print a wood grain pattern layer with a collection of circular dots. Next, a film-shaped (50μm thick) transparent layer made of polyvinyl chloride resin was placed on one side of the pattern layer, which was one side of the substrate, and the substrate and transparent layer were bonded by thermocompression. This produced decorative sheet specimen 1.

[0053] Test specimen 2 Decorative sheet specimen 2 was prepared in the same manner as specimen 1, except that dichloro DPP red (pigment red 254 / CI56110) (median diameter 100 nm) was used as the pigment to prepare ink for inkjet printing (viscosity 3 mPa s at 30°C, surface tension 70 mN / m).

[0054] Test specimen 3 Decorative sheet specimen 3 was produced in the same manner as specimen 1, except that dimethyl DPP red (pigment red 272 / CI561150) (median diameter 200 nm) was used as the pigment to prepare ink for inkjet printing (viscosity 10 mPa s at 30°C, surface tension 40 mN / m).

[0055] Test specimen 4 Decorative sheet specimen 4 was produced in the same manner as specimen 1, except that diphenyl DPP red (pigment red 264 / CI561300) (median diameter 300 nm) was used as the pigment to prepare ink for inkjet printing (viscosity 7 mPa s at 30°C, surface tension 30 mN / m).

[0056] Test specimen 5 Decorative sheet specimen 5 was prepared in the same manner as specimen 1, except that dicyano DPP orange (pigment orange 71 / CI561200) (median diameter 150 nm) was used as the pigment to prepare ink for inkjet printing (viscosity 5 mPa s at 30°C, surface tension 20 mN / m).

[0057] Test specimen 6 Decorative sheet specimen 6 was prepared in the same manner as specimen 1, except that dibutyl DPP orange (pigment orange 73 / CI561170) (median diameter 250 nm) was used as the pigment to prepare ink for inkjet printing (viscosity 6 mPa s at 30°C, surface tension 10 mN / m).

[0058] Test specimen 7 A primer containing urethane resin is applied to one side of the substrate and dried to create an ink-receiving layer (mass when dry: 6 g / m 2 ) and then a design layer was provided on the ink-receiving layer, and other than that, specimen 7 of the decorative sheet was prepared in the same manner as specimen 1.

[0059] Test specimen 8 A primer containing urethane resin is applied to one side of the substrate and dried to create an ink-receiving layer (mass when dry: 6 g / m 2 ) and then a design layer was provided on the ink receiving layer, and the rest of the process was the same as for specimen 2, to prepare decorative sheet specimen 8.

[0060] Test specimen 9 A primer containing urethane resin is applied to one side of the substrate and dried to create an ink-receiving layer (mass when dry: 6 g / m 2 ) and then a design layer was provided on the ink-receiving layer, and the rest of the process was the same as for specimen 3, to prepare decorative sheet specimen 9.

[0061] Test piece 10 A primer containing urethane resin is applied to one side of the substrate and dried to create an ink-receiving layer (mass when dry: 6 g / m 2 ) and then a design layer was provided on the ink-receiving layer, and the rest of the process was the same as for specimen 4, to prepare decorative sheet specimen 10.

[0062] Test specimen 11 A primer containing urethane resin is applied to one side of the substrate and dried to create an ink-receiving layer (mass when dry: 6 g / m 2 ) and then a design layer was provided on the ink-receiving layer, and the rest of the process was the same as for specimen 5, to prepare decorative sheet specimen 11.

[0063] Test specimen 12 A primer containing urethane resin is applied to one side of the substrate and dried to create an ink-receiving layer (mass when dry: 6 g / m 2) and then a design layer was provided on the ink-receiving layer, and the rest of the process was the same as for specimen 6, to prepare decorative sheet specimen 12.

[0064] Comparison body 1 Comparative decorative sheet specimen 1 was produced in the same manner as test specimen 1, except that Pigment Red 150 (CI12290) (median diameter 30 nm) was used as the pigment to prepare ink for inkjet printing (viscosity 1 mPa s at 30°C, surface tension 80 mN / m).

[0065] Comparison body 2 A primer containing urethane resin is applied to one side of the substrate and dried to create an ink-receiving layer (mass when dry: 6 g / m 2 ) and then a design layer was provided on the ink-receiving layer, and the rest of the process was the same as for Comparative Example 1, to prepare Comparative Decorative Sheet Example 2.

[0066] [Evaluation method] <Fading property> Weather resistance tests were conducted under the following conditions for test specimens 1 to 12 and comparative specimens 1 and 2, and the degree of fading of the design layer was visually confirmed. The results are shown in Table 1 below. In Table 1, cases in which the design layer was in an excellent state with no fading at all were indicated with "◎", cases in which the design layer was in a good state with almost no fading were indicated with "○", cases in which the design layer was in a state where fading was observed but did not pose a problem for practical use were indicated with "△", and cases in which fading of the design layer was observed to the extent that it was not practically usable were indicated with "×".

[0067] Testing machine: Ultraviolet fade meter "U48 (model number)" manufactured by Suga Testing Machine Co., Ltd. ·Irradiation light: Ultraviolet (UV) ·Illuminance: 500W / m 2 Black Panel Temperature (BPT): 63℃ ·Humidity: 50%RH Irradiation time: 200 hours

[0068] [Evaluation Results] The evaluation results are shown in Table 1 below.

[0069] [Table 1]

[0070] As can be seen from Table 1, the color fading of comparative specimens 1 and 2 was rated as "x". In contrast, the color fading of specimens 1 to 6 was rated as "○", and in particular, specimens 7 to 12, which were provided with an ink-receiving layer, showed improved pigment fixation and rated as "◎" in color fading. Thus, the effects of the decorative sheet and decorative material, and the method for manufacturing the decorative sheet, according to the present invention, were confirmed. [Industrial Applicability]

[0071] According to the present invention, discoloration can be significantly suppressed even when used in building materials, and therefore the present invention can be used extremely beneficially in various industries including the construction industry. [Explanation of symbols]

[0072] 10 Decorative Sheet 11 Base material 12 Picture layer 13 Transparent layer 100 Cosmetic materials 101 Substrate 102 Adhesive layer

Claims

1. A film-shaped substrate; A pattern layer provided on one side of the substrate; a film-shaped transparent layer provided on one side of the picture layer so as to sandwich the picture layer between the substrate and the transparent layer; In the decorative sheet, The pattern layer is composed of a collection of dots containing a pigment with a diketopyrrolopyrrole skeleton. A decorative sheet characterized by:

2. The diketopyrrolopyrrole skeleton pigment is at least one of unsubstituted diketopyrrolopyrrole red, dichlorodiketopyrrolopyrrole red, dimethyldiketopyrrolopyrrole red, diphenyldiketopyrrolopyrrole red, dicyanodiketopyrrolopyrrole orange, and dibutyldiketopyrrolopyrrole orange.

2. The decorative sheet according to claim 1.

3. The diketopyrrolopyrrole skeleton pigment has a median diameter of 40 nm or more and 300 nm or less.

2. The decorative sheet according to claim 1.

4. The substrate is made of at least one of resin, paper, wood, metal, and glass.

2. The decorative sheet according to claim 1.

5. The transparent layer is made of a transparent resin.

2. The decorative sheet according to claim 1.

6. An ink-receiving layer containing a urethane resin is provided between the substrate and the pattern layer.

2. The decorative sheet according to claim 1.

7. An adhesive layer is provided between the design layer and the transparent layer.

2. The decorative sheet according to claim 1.

8. The decorative sheet according to any one of claims 1 to 7, a substrate having one side attached to the other side of the base material of the decorative sheet; A decorative material comprising:

9. A method for producing the decorative sheet according to claim 1, comprising: a pattern layer forming step of forming a pattern layer by spraying an ink for inkjet printing containing the diketopyrrolopyrrole skeleton pigment onto one side of the substrate by an inkjet printing method, the pattern layer being formed by the aggregate of the dots; a transparent layer bonding process in which the transparent layer in a film form is disposed on one side of the base material and the base material and the transparent layer are bonded together so as to sandwich the pattern layer; A method for producing a decorative sheet, comprising carrying out the steps of:

10. The ink has a viscosity at 30° C. of 2 mPa·s or more and 10 mPa·s or less, and a surface tension of more than 0 mN / m and less than 70 mN / m. The method for producing a decorative sheet according to claim 9 .

11. An ink receiving layer forming step of providing an ink receiving layer that receives the ink on one side of the base material is carried out prior to the design layer forming step. The method for producing a decorative sheet according to claim 9 .

12. An adhesive layer forming step of providing an adhesive layer on one side of the base material on which the design layer is provided is performed between the design layer forming step and the transparent layer bonding step. The method for producing a decorative sheet according to claim 9 .

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