JP2011047152A - Building board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building board which achieves suitable discoloration. <P>SOLUTION: This building board 500 is patterned with a yellow dot 540Y which is formed from ink containing a yellow pigment, a magenta dot 540M which is formed from ink containing a magenta pigment, and a cyan dot 540C which is formed from ink containing a cyan pigment. Yellow, magenta and cyan components are approximately identical in color difference before and after the discoloration of the patterned building board 500. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a building board.

  Conventionally, many techniques have been proposed in connection with patterning on building boards. For example, regarding a painted building board in which the surface of a building board having a concavo-convex pattern is painted by an ink jet coating machine, in the convex part and the concave part adjacent to the concavo-convex pattern of the building board, A technology has been proposed in which an ink-jet coating machine is used to color and paint the rising surface between the convex surface and the concave bottom surface with an intermediate color between the convex coating color and the concave bottom coating color. (For example, refer to Patent Document 1).

  Further, it is intended to provide a coating method capable of efficiently and accurately drawing a pattern, particularly an appearance pattern imitating natural stone, on the surface of a substrate having a lower colored coating film, and obtaining a substrate having excellent durability. As a purpose, in addition to using a combination of a piezoelectric vibration type inkjet printer and a control signal of a computer, a technique using a pigment having an average particle diameter of 60 to 1000 nm as an ink coloring pigment has been proposed (for example, patents). Reference 2).

  Furthermore, for the purpose of providing a decorative building board capable of obtaining high fading resistance, an undercoat layer, an ink receiving layer, an ink jet layer, a clear layer, an inorganic paint layer, and a photocatalyst paint layer are provided on the surface of the substrate. A decorative building board formed by laminating in order has been proposed. The inkjet layer includes yellow ink containing a pigment selected from yellow iron oxide, Ti-Ni-Ba yellow, Ti-Sb-Ni yellow, Ti-Nb-Ni yellow, and Ti-Sb-Cr yellow. Cyan ink containing a pigment selected from Co-Al blue, Co-Al-Cr blue, red iron oxide, Fe-Zn brown, Fe-Zn-Cr brown, Fe-Ni-Al It is formed of three colors of ink that do not contain an organic pigment, and are formed of a magenta ink containing a pigment selected from brown (see, for example, Patent Document 3). The applicant has also proposed a technique related to an outdoor coloring plate (outdoor colored product) (see, for example, Patent Document 4 and Patent Document 5).

JP 2007-177573 A Japanese Patent Laid-Open No. 10-128231 JP 2008-63831 A JP 2008-80629 A JP 2009-52030 A

  By the way, since a building board is installed (constructed) outdoors, for example, a long term period, specifically, weather resistance of about 5 to 10 years is required. For example, even if it is exposed to heat, light (sunlight), and water (rain) for about 10 years, it is required that the building board hardly deteriorates and maintain its appearance. However, satisfying such a requirement is not always easy, and discoloration may occur. The applicant decided to develop a new building board after allowing such discoloration that is difficult to suppress.

  An object of this invention is to provide the building board which can implement | achieve suitable discoloration.

  The present invention has been made in view of the above-mentioned problems, in which the color difference of the yellow component, the color difference of the magenta component, and the color difference of the cyan component are substantially the same for the color difference before and after the color change of the patterned building board.

  A first problem-solving means that reflects the present invention is a construction in which yellow dots are formed with ink containing a yellow pigment, magenta dots are formed with ink containing a magenta pigment, and cyan dots are formed with ink containing a cyan pigment. The color difference before and after the color change of the patterned building board is a building board characterized in that the color difference of the yellow component, the color difference of the magenta component, and the color difference of the cyan component are substantially the same. .

  According to this, it is possible to prevent a specific color component from changing or fading among the yellow component, the magenta component, and the cyan component. Specifically, it is possible to prevent a state in which the color of a specific color component, for example, the color of a yellow component disappears from a predetermined pattern formed on the building board.

  The second problem solving means is a building board of the first problem solving means and is used as an exterior material of a building. According to this, it can be set as the building board as an exterior material of the building which can exhibit the outstanding function (action) by the 1st subject solution means mentioned above.

  A third problem solving means is the building board of the first or second problem solving means, wherein the building board is further patterned with an ink containing a black pigment, and the yellow pigment, the magenta pigment, and the The cyan pigment and the black pigment are inorganic pigments. According to this, furthermore, yellow, magenta, cyan, and black are all made of inorganic pigments, and inks containing these can be used to form a patterned building board.

  The fourth problem solving means is a building board according to any one of the first to third problem solving means, wherein the ink containing the yellow pigment, the ink containing the magenta pigment, and the ink containing the cyan pigment. Is an ultraviolet curable ink. According to this, it can be set as the building board patterned with suitable image quality.

  ADVANTAGE OF THE INVENTION According to this invention, the building board which can implement | achieve suitable discoloration can be obtained.

It is a figure explaining a building board and an inkjet layer.

  Embodiments for implementing the above problem solving means reflecting the present invention will be described below in detail with reference to the drawings. The above-mentioned problem solving means is not limited to the configuration described below, and various configurations can be adopted in the same technical idea. For example, in each configuration described below, a predetermined configuration can be omitted.

(Architecture board)
The building board of this embodiment is used as a building exterior material, more specifically, for example, as an outer wall or a roofing material. The building board 500 has, for example, the configuration shown in FIG. 1A, and includes a base material 510 and coating layers 520 to 560 formed by being applied to the surface of the base material 510. The base material 510 is made of, for example, a ceramic siding material. The base material 510 is formed into a plate shape using a high-temperature, high-pressure kettle or the like using cement and fibers as main raw materials. For example, a sealer 520 and a base coat 530 are formed (applied) on the surface of the substrate 510.

  An ink jet layer 540 is formed (recorded) on the surface of the base coat 530. In other words, the inkjet layer 540 is recorded using the base coat 530 as a base. The inkjet layer 540 is a layer patterned according to data representing a predetermined pattern (image) input from an external device connected to be communicable to the inkjet recording apparatus (see FIG. 1B). For patterning, for example, ultraviolet curable ink is used, and ultraviolet curable ink droplets are ejected from the recording head of the ink jet recording apparatus and land on the surface of the base coat 530 in accordance with data representing a predetermined pattern (image). Done. The pattern imparted to the inkjet layer 540 is formed by dots formed by discharged ultraviolet curable ink droplets. For example, when the ink color used in the inkjet recording apparatus for patterning is yellow, yellow, magenta, cyan, and black (blackK), the applied pattern is a yellow dot. 540Y, magenta dots 540M, cyan dots 540C, and black dots 540K.

  The ultraviolet curable ink includes a reactive oligomer, a reactive monomer, a photopolymerization initiator, and a pigment as a coloring material. In the case of yellow, magenta and cyan, the pigment can be either an inorganic pigment or an organic pigment. In addition, an inorganic pigment is used for black. As yellow inorganic pigments, C.I. Pigment Yellow 42 and C.I. Pigment Yellow 184 are suitable. As the magenta inorganic pigment, C.I. Pigment Red 101 and C.I. Pigment Red 102 are suitable. As the cyan inorganic pigment, C.I. Pigment Blue 28 and C.I. Pigment Blue 36 are suitable. As the black inorganic pigment, C.I. Pigment Black 7 is suitable.

  As the yellow organic pigment, C.I. Pigment Yellow 120 and C.I. Pigment Yellow 150 are suitable. Magenta organic pigments include C.I. Pigment Red 122, C.I. Pigment Red 178, C.I. Pigment Red 179, C.I. Pigment Red 202, C.I. Pigment Red 254, and C.I. -Pigment violet 19 is suitable. Examples of cyan organic pigments include C-I Pigment Blue 15, C-I Pigment Blue 15: 1, C-I Pigment Blue 15: 2, C-I Pigment Blue 15: 3, and C-I Pigment. Blue 15: 4, C.I. Pigment Blue 15: 6, and C.I. Pigment Blue 16 are preferred. The ultraviolet curable ink is cured by being irradiated with ultraviolet rays after patterning is finished (after a predetermined pattern is recorded).

  A top coat 550 is formed on the surface of the inkjet layer 540 that has been cured by being irradiated with ultraviolet rays for the purpose of improving weather resistance. Further, on the surface of the top coat 550, for example, a coating for imparting an antifouling function (hereinafter, also referred to as “value added coat layer”) 560 is formed. The top coat 550 and the value-added coat layer 560 are transparent (colorless and transparent) coating layers, and the pattern imparted to the inkjet layer 540 is visually recognized through the top coat 550 and the value-added coat layer 560. Is done.

  Here, the base material 510 has a plate thickness of about 15 mm. Moreover, each coating layer 520-560 formed in the surface of the base material 510 is each formed in predetermined thickness (film thickness). In addition, about the component of each coating layer 520-560 and its thickness, since it can be set as the component similar to the test building board used for the accelerated weathering test which concerns on an Example as described next, and comparable thickness, The description is omitted.

(Example)
In order to confirm the color fading characteristics of the building board 500 of this embodiment, an accelerated weather resistance test was performed. Hereinafter, the result of this accelerated weathering test will be described.

(Test building board)
In this accelerated weathering test, a total of seven types of test building boards including Examples 1 to 3 related to the building board 500 of the present embodiment and Comparative Examples 1 to 4 for comparison were used. The test building board was configured as shown in FIG. 1 for all types. That is, each said coating layer 520-560 was formed in the surface of the base material 510 by a ceramic siding material. The pattern imparted to the inkjet layer 540 was a monochromatic pattern of each of yellow, magenta, cyan, and black (excluding Example 3) and a brick tone pattern in each of Examples 1 to 3 and Comparative Examples 1 to 4.

Here, the components and thicknesses of the respective coating layers 520, 530, 550, and 560 excluding the ink jet layer 540 are as follows, and are the same for each test building board.
<Components and thickness of each coating layer>
Sealer: Water-based paint (acrylic styrene) / 50μm
Base coat: Water-based paint (acrylic) / 100μm
Topcoat: Water-based paint (acrylic silicon) / 30μm
Value-added coat layer: Antifouling function (hydrophilic treatment) / 5μm

In addition, with respect to Examples 1 to 3 and Comparative Examples 1 to 4, pigments contained in the ultraviolet curable ink for forming the ink jet layer 540 are as shown in Table 1. Here, Example 1 and Example 2 are combinations of inorganic pigments for yellow, magenta, and cyan. Similarly, Example 3 is a combination of organic pigments. In contrast, in Comparative Example 1, yellow is an organic pigment, and magenta and cyan are a combination of inorganic pigments. In Comparative Example 2, yellow and cyan are inorganic pigments, and magenta is an organic pigment combination. In Comparative Example 3, yellow and magenta are inorganic pigments and cyan is a combination of organic pigments. Comparative Example 4 is a combination of inorganic pigments for yellow, magenta, and cyan. In addition, about Examples 1-3 and Comparative Examples 1-4, black is an inorganic pigment. Moreover, about each building board for a test, the thickness of the inkjet layer 540 was all 10 micrometers.

(Conditions for patterning by inkjet recording device)
Patterning of the ink jet layer 540, in other words, ink jet recording for forming the ink jet layer 540 and ultraviolet irradiation after the patterning was completed were performed under the following conditions.
<Conditions with pattern>
Nozzle diameter: 70 μm
Applied voltage: 50V
Pulse width: 20 μs
Drive frequency: 3 kHz
Resolution: 180 dpi x 180 dpi
Heating temperature: 60 ° C
<Ultraviolet irradiation conditions>
Lamp type: Metal halide lamp Voltage: 200W / cm
Irradiation time: 1 second Irradiation distance: 10 cm

(Accelerated weathering test method)
The accelerated weathering test was performed using a super accelerated weathering tester (Isuperki UV Tester, model: SUV-W151 manufactured by Iwasaki Electric Co., Ltd.). The test time was 600 hours (equivalent to 10 years outdoors), and the discoloration in Examples 1 to 3 and Comparative Examples 1 to 4 was measured every 120 hours. The accelerated weathering test was in accordance with Japan Testing Machine Industry Association JTM G 01: 2000. The details of the test conditions are as follows. For the measurement of fading color, a color difference meter (spectral colorimeter manufactured by Konica Minolta Sensing Co., Ltd., model: CM-3600d) was used, and L ^* a ^* b ^* color difference (ΔE ^* ab) (CIE1976 / below, L ^* a ^* b ^* color difference (ΔE ^* ab) is referred to as “color difference (ΔE)”).
<Super accelerated weathering test conditions>
Light source: Water-cooled metal halide lamp Illuminance: 90 mW / cm ²
Wavelength: 295-450 nm
Temperature: 60 ° C (irradiation), 30 ° C (condensation)
Humidity: 50% (irradiation), 90% (condensation)
Cycle: Irradiation 5 hours, condensation 5 hours Shower: 10 seconds before and after condensation

(Accelerated weathering test results)
The accelerated weathering test results, specifically, the accelerated weathering test results based on the test building board having the inkjet layer 540 with a monochromatic pattern will be described with reference to Tables 2-7. Table 2 shows Comparative Example 1, Table 3 shows Comparative Example 2, Table 4 shows Comparative Example 3, and Table 5 shows changes in color difference (ΔE) with respect to Comparative Example 4. Table 6 shows changes in color difference (ΔE) in Example 1, Table 7 in Example 2, and Table 8 in Example 3.

  First, Comparative Examples 1 to 4 will be described. In Comparative Example 1, as shown in Table 2, for example, the color difference (ΔE) of each color 120 hours after the start of the test is 1.89 for yellow, 1.20 for magenta, and 0.39 for cyan. The color difference (ΔE) of black is 0.58. Accordingly, the difference between the colors in terms of the color difference (ΔE) is 1.60 (between yellow and cyan) at the maximum, and the color difference of each color component is substantially within the same range (the applicant has empirically within about 5 or less. Found to be suitable).

  On the other hand, the color difference (ΔE) of each color after the elapse of 600 hours corresponding to the state exposed to the outdoors for 10 years is 15.33 for yellow, 1.27 for magenta, and 1.13 for cyan. The color difference (ΔE) of black is 0.68. Therefore, the difference between the colors with respect to the color difference (ΔE) is 14.65 (between yellow and black) at the maximum, and a significant difference is recognized in the color difference of each color component. Even when the other three colors excluding black are targeted, the maximum difference is 14.2 (between yellow and cyan), which is a significant difference. In Comparative Example 1, the maximum difference between the colors exceeds 5 (between yellow and black) when 360 hours have elapsed from the start of the test (corresponding to the state exposed to the outdoors for 5 or 6 years). The same result is obtained when the other three colors other than black are used (between yellow and cyan).

As is clear from the above results, in Comparative Example 1, the yellow component (only) is severely faded with respect to the color difference before and after discoloration of the patterned test building board (predetermined pattern formed on the inkjet layer 540). To do. Such a state was confirmed also in the test building board with a brick-like pattern. That is, it was confirmed that the yellow building color (yellowishness) disappeared on the test building board with the brick-like pattern.

  In Comparative Example 2, as shown in Table 3, for example, the color difference (ΔE) after 120 hours from the start of the test is 0.77 for yellow, 2.33 for magenta, and 0.39 for cyan. The color difference (ΔE) of black is 0.58. Therefore, the difference between the colors with respect to the color difference (ΔE) is 1.94 at the maximum (between magenta and cyan), and the color difference of each color component is recognized to be in the substantially same range.

  In contrast, after 600 hours from the start of the test, the color difference (ΔE) of each color is 1.99 for yellow, 16.66 for magenta, and 1.13 for cyan. The color difference (ΔE) of black is 0.68. Therefore, the difference between the colors with respect to the color difference (ΔE) is 15.98 (between magenta and black) at the maximum, and a significant difference is recognized in the color difference of each color component. Even when the other three colors excluding black are targeted, the maximum difference is 15.53 (between magenta and cyan), which is a significant difference. In Comparative Example 2, the maximum difference between the colors exceeds 5 (between magenta and black) when 360 hours have elapsed from the start of the test. The same result is obtained for the other three colors except black (between magenta and cyan).

As is clear from the above results, in Comparative Example 2, the magenta component (only) was severely faded with respect to the color difference before and after discoloration of the patterned test building board (predetermined pattern formed on the inkjet layer 540). To do. Such a state was confirmed also in the test building board with a brick-like pattern. That is, it was confirmed that the magenta component color (red) disappeared on the test building board with the brick-like pattern.

  In Comparative Example 3, as shown in Table 4, for example, the color difference (ΔE) of each color 120 hours after the start of the test is 0.77 for yellow, 1.20 for magenta, and 3.80 for cyan. The color difference (ΔE) of black is 0.58. Therefore, the difference between each color difference (ΔE) is 3.22 at maximum (between cyan and black), and the color difference of each color component is recognized to be in the substantially same range. Even when the other three colors excluding black are targeted, the maximum difference is 3.03 (between yellow and cyan), which is recognized to be within the same range.

  On the other hand, the color difference (ΔE) of each color after 600 hours from the start of the test is 1.99 for yellow, 1.27 for magenta, and 19.87 for cyan. The color difference (ΔE) of black is 0.68. Therefore, the difference between the colors in terms of the color difference (ΔE) is 19.19 (between cyan and black) at the maximum, and a significant difference is recognized in the color difference of each color component. Even when the other three colors excluding black are targeted, the maximum difference is 18.6 (between magenta and cyan), which is a significant difference. In Comparative Example 3, the maximum difference between the colors exceeds 5 (between cyan and black) when 240 hours have elapsed from the start of the test (corresponding to a state exposed to the outdoors for 3 or 4 years). When the other three colors excluding black are targeted, the maximum difference between each color exceeds 5 (between magenta and cyan) when 360 hours have passed.

As is clear from the above results, in Comparative Example 3, the cyan component (only) is severely faded with respect to the color difference before and after discoloration of the patterned test building board (predetermined pattern formed on the inkjet layer 540). To do. Such a state was confirmed also in the test building board with a brick-like pattern. That is, it was confirmed that the cyan building color (blue tint) disappeared on the test building board with a brick-like pattern.

  In Comparative Example 4, as shown in Table 5, for example, the color difference (ΔE) of each color 120 hours after the start of the test is 0.77 for yellow, 1.20 for magenta, and 3.45 for cyan. The color difference (ΔE) of black is 0.58. Therefore, the difference between the colors with respect to the color difference (ΔE) is 2.87 (between cyan and black) at the maximum, and the color difference of each color component is recognized to be in the substantially same range. Note that the maximum difference is 2.68 (between yellow and cyan) even in the other three colors except for black, and it is recognized that they are within the same range.

  In contrast, after 600 hours from the start of the test, the color difference (ΔE) of each color is 1.99 for yellow, 1.27 for magenta, and 15.44 for cyan. The color difference (ΔE) of black is 0.68. Therefore, the difference between the colors with respect to the color difference (ΔE) is 14.76 at the maximum (between cyan and black), and a significant difference is recognized in the color difference of each color component. Even when the other three colors excluding black are targeted, the maximum difference is 14.17 (between magenta and cyan), which is a significant difference. In Comparative Example 4, the maximum difference between the colors exceeds 5 (between cyan and black) when 240 hours have elapsed from the start of the test (corresponding to the state exposed to the outdoors for 3 or 4 years). The same result is obtained for the other three colors except black (between magenta and cyan).

As is clear from the above results, in Comparative Example 4, the cyan component (only) is severely faded with respect to the color difference before and after discoloration of the patterned test building board (predetermined pattern formed on the inkjet layer 540). To do. Such a state was confirmed also in the test building board with a brick-like pattern. That is, it was confirmed that the cyan building color (blue tint) disappeared on the test building board with the brick-like pattern.

  Next, Examples 1 to 3 will be described. In Example 1, as shown in Table 6, for example, the color difference (ΔE) after 120 hours from the start of the test is 0.77 for yellow, 1.20 for magenta, and 0.39 for cyan. The color difference (ΔE) of black is 0.58. Therefore, the difference between the colors with respect to the color difference (ΔE) is 0.81 at the maximum (between magenta and cyan), and the color difference of each color component is recognized to be in the substantially same range.

  Further, the color difference (ΔE) of each color after elapse of 600 hours corresponding to the state exposed to the outdoors for 10 years is 1.99 for yellow, 1.27 for magenta, and 1.13 for cyan. The color difference (ΔE) of black is 0.68. Accordingly, the difference between the colors with respect to the color difference (ΔE) is 1.31 at the maximum (between yellow and black). Also in this case, the color difference of each color component is recognized to be in the substantially same range. When the other three colors excluding black are targeted, the maximum difference is 0.86 (between yellow and cyan), and the difference is further reduced.

As is clear from the above results, in Example 1, the color difference before and after the color change of the patterned test building board (the predetermined pattern formed on the inkjet layer 540) is substantially the same regardless of the passage of time. Can be maintained in the range. Such a state was confirmed also in the test building board with a brick-like pattern. That is, in the test building board with a brick-like pattern, it was not confirmed that the color of the specific color component disappeared.

  In Example 2, as shown in Table 7, for example, the color difference (ΔE) after 120 hours from the start of the test is 0.17 for yellow, 1.20 for magenta, and 0.39 for cyan. The color difference (ΔE) of black is 0.58. Therefore, the difference between the colors with respect to the color difference (ΔE) is 1.03 at the maximum (between yellow and magenta), and the color difference of each color component is recognized to be in the substantially same range.

  Further, after 600 hours from the start of the test, the color difference (ΔE) of each color is 2.12 for yellow, 1.27 for magenta, and 1.13 for cyan. The color difference (ΔE) of black is 0.68. Therefore, the difference between the colors in terms of the color difference (ΔE) is 1.44 at the maximum (between yellow and black). In this case as well, the color difference of each color component is recognized to be in the substantially same range. When the other three colors excluding black are targeted, the maximum difference is 0.99 (between yellow and cyan), and the difference is further reduced.

As is clear from the above results, in Example 2, the color difference before and after the color change of the patterned test building board (predetermined pattern formed on the inkjet layer 540) is substantially the same regardless of the passage of time. Can be maintained in the range. Such a state was confirmed also in the test building board with a brick-like pattern. That is, in the test building board with a brick-like pattern, it was not confirmed that the color of the specific color component disappeared.

  In Example 3, as shown in Table 8, for example, the color difference (ΔE) after 120 hours from the start of the test is 1.89 for yellow, 2.33 for magenta, and 3.80 for cyan. Therefore, the difference between the colors in terms of the color difference (ΔE) is 1.91 (between yellow and cyan) at the maximum, and the color difference of each color component is recognized to be in the substantially same range.

  Further, the color difference (ΔE) of each color after elapse of 600 hours from the start of the test is 15.33 for yellow, 16.66 for magenta, and 19.87 for cyan. Therefore, the maximum difference between the colors in terms of the color difference (ΔE) is 4.54 (between yellow and cyan), and in this case as well, the color difference of each color component is recognized to be in the substantially same range.

As is clear from the above results, in Example 3, the color difference before and after the color change of the patterned test building board (predetermined pattern formed on the inkjet layer 540) is substantially the same regardless of the passage of time. Can be maintained in the range. Such a state was confirmed also in the test building board with a brick-like pattern. That is, in the test building board with a brick-like pattern, although it faded violently as a whole, it was not discolored, and the state in which the color of a specific color component disappeared was not confirmed. In addition, a brick-like pattern was confirmed after a lapse of 600 hours corresponding to the state exposed to the outdoors for 10 years.

(Advantageous effects based on the configuration of the present embodiment)
The building board 500 has the same color difference between the yellow component, the magenta component, and the cyan component as the color difference before and after the color change of the patterned building board 500, or in addition to these, the color difference of the black component. This is to prevent the fading of a particular color component from being severely faded even after 600 hours have elapsed since the start of the accelerated weathering test, which corresponds to a state in which it is exposed to the outdoors for 10 years. According to this, the discoloration progressed in the color image of the building board 500 patterned with the yellow dots 540Y, the magenta dots 540M, and the cyan dots 540C, or in addition to these, with the black dots 540K by the ink jet recording apparatus. In some cases, it can be maintained.

  In other words, the building board 500 of the present embodiment, in other words, regarding the color difference before and after the faded color of the patterned building board 500, the color difference of the yellow dot 540Y, the color difference of the magenta dot 540M, and the color difference of the cyan dot 540C, It can be said that they are substantially the same (the same applies to the black dot 540K).

(Modification)
The architectural board 500 of this embodiment can also be set as the following structures.

  (1) In the above, the structure which used the base material 510 of the building board 500 as the ceramic siding material was demonstrated to the example. However, other configurations are possible. For example, the base material 510 can be a metal plate. In this case, the sealer 520 is omitted. The sealer 520, the base coat 530, the top coat 550, and the value added coat layer 560 can be omitted in consideration of various points. Moreover, layers other than these can also be formed.

  (2) In the above description, UV curable ink is used as an example. However, other inks can be used. For example, water-based ink or solvent ink can be used to form an ink-jet layer (corresponding to the ink-jet layer 540) using these inks.

(3) In the above description, the color difference (ΔE) according to CIE 1976 has been described as an example. However, for example, a color difference (ΔE ₀₀ ) by CIE 2000 can also be used.

  (4) In the above, the case where the building board 500 is an exterior material of a building such as an outer wall or a roof material has been described as an example. However, the technical idea adopted by the present embodiment can also be applied to a building board used as an interior material.

500 Building board 540 Inkjet layer 540Y Yellow dot 540M Magenta dot 540C Cyan dot

Claims (4)

A building board patterned with yellow dots with ink containing a yellow pigment, magenta dots with ink containing a magenta pigment, and cyan dots with ink containing a cyan pigment,
Regarding the color difference before and after the color change of the patterned building board, the building board is characterized in that the color difference of the yellow component, the color difference of the magenta component, and the color difference of the cyan component are substantially the same.   The building board according to claim 1, wherein the building board is used as an exterior material of a building. The building board is further patterned with an ink containing a black pigment,
The building board according to claim 1, wherein the yellow pigment, the magenta pigment, the cyan pigment, and the black pigment are inorganic pigments.   4. The ink according to claim 1, wherein the ink containing the yellow pigment, the ink containing the magenta pigment, and the ink containing the cyan pigment are ultraviolet curable inks. 5. Building board.

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