Decorative sheet

Abstract

To provide a decorative sheet capable of performing a design expression in which color tones vary by directions of a light source and directions of an observer, and a design expression inherent to an interference pigment such that a pattern observed when not irradiating is extinguished by irradiation with light from a rear face of a face an observer looks.SOLUTION: A decorative sheet includes a design-forming layer 10 including an interference pigment obtained by coating mica with titanium oxide, and a reflection control layer 9 from a surface on a decorative sheet substrate 1 to a decorative sheet substrate 1 side, where the reflection control layer 9 includes a resin, and a scaly magnetic substance powder, and is formed by aligning a magnetic substance powder having a metallic sheen by application of a magnetic field.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a decorative sheet, which is used when decorating the surfaces of interior materials such as wall materials, ceiling materials, floor materials, and trim materials in buildings such as houses, furniture, household utensils, exterior parts of residential equipment and household appliances, exterior parts of electronic devices such as mobile phones and personal computers, and interior and exterior surfaces of vehicles such as automobiles and trains. More specifically, the present invention relates to a decorative sheet that exhibits a design directionality in which the appearance changes depending on the incident side of incident light, the back side thereof, the angle of the incident light, and the angle at which the observer views it.

Background Art

[0002] Generally, an interference pigment forms an interference color due to the refractive index difference between titanium oxide and mica by coating flaky mica with titanium oxide, and it is possible to control white, blue, green, red, yellow, etc. depending on the thickness of the titanium oxide. Further, by orienting the layers, light is multiply reflected, and a gloss similar to that of a pearl can be obtained. Furthermore, since the passing distance of titanium oxide in the light path changes depending on the angle of the light source and the observer with respect to the orientation direction of the interference pigment, a change in color tone depending on the angle is observed, and this is frequently used for expressing a three-dimensional effect and a deep printing expression.

[0003] Furthermore, different from general process color inks, since an interference pigment has little light absorption ability in the pigment itself, the complementary color of the reflected light is transmitted with respect to the transmitted light, and a usage method has been proposed in which a pattern observed when not irradiated disappears by irradiating light from the opposite side of the observer by devising the layer structure (see Patent Document 1 and Patent Document 2).

[0004] On the one hand, the inventors of the present application have invented a decorative sheet that can achieve a high-level design expression by applying a magnetic field to the magnetic powder with a flaky metallic luster contained in the reflection control layer provided on the lower surface of the design formation layer and orienting it, and the reflectance changes depending on the observation direction. They have already filed an application on November 7, 2022. The technology of this application has the characteristic that since the incident light is reflected at an angle controlled by the magnetic body with a metallic luster, the performance is exhibited by taking a special reflection angle in which the incident light is not specularly reflected on the printing surface and the reflected light is weakened or strengthened depending on the angle.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the design expression using interference pigments whose appearance changes depending on the angle between the incident light and the observer, there are many problems such as the color tone change due to the angle being gentle and lacking impact, or the design expression such as the color tone change not being well exhibited in the positional relationship between the light source and the observer.

[0007] In addition, a decorative sheet having a reflection control layer formed by including magnetic powder with a flaky metallic luster and orienting the magnetic powder with the metallic luster by applying a magnetic field has a large design change due to the change in the amount of light between the direction of the light source and the direction of the observer, and is characterized in that it is suitable for expressing a three-dimensional effect, etc. However, it does not have a design expression such as a change in color tone between the direction of the light source and the direction of the observer, or a design expression peculiar to interference pigments such as the pattern observed when not irradiated disappearing when light is irradiated from the back surface of the surface being viewed by the observer.

[0008] In view of the above, the present invention aims to provide a decorative sheet that enables design expressions in which the color tone changes depending on the direction of the light source and the direction of the observer, and design expressions peculiar to interference pigments such as the pattern observed when not irradiated disappearing by irradiating light from the back surface of the surface being visually observed by the observer.

Means for Solving the Problems

[0009] In order to solve the above-described problems, the decorative sheet according to claim 1 has a design-forming layer containing an interference pigment formed by coating mica with titanium oxide from the surface toward the decorative sheet base material side on the decorative sheet base material, and a reflection control layer. The reflection control layer contains a resin and magnetic powder having a scaly metallic luster, and is formed by orienting the magnetic powder having the metallic luster by applying a magnetic field.

[0010] And by having such a configuration, the design of the decorative sheet can be changed complexly depending on the light incident from the observer side, the transmitted light incident from the opposite side of the observer, and the observation angle of the decorative sheet viewed by the observer. This is because the characteristics of the interference pigment that reflects light of a specific wavelength according to the thickness of the coated titanium oxide and transmits the remaining wavelengths of light and the characteristics of the reflection control layer that imparts light directionality to the incident light act with a synergistic effect, and the characteristic of the interference pigment that the color changes depending on the observation direction is forcibly expressed by imparting light directionality by the reflection control layer, resulting in a strong design change by the reflected light that has never been seen before. Also, when the transmitted light from the back surface is sufficiently strong compared to the incident light from the observer side, it is also a characteristic of the decorative sheet to maintain the characteristics of the design-forming layer containing the interference pigment so that the design by the reflected light seems to disappear.

[0011] The decorative sheet according to claim 2 is the decorative sheet according to claim 1, further having a concealment layer between the reflection control layer and the decorative sheet base material, the concealment layer having a total light reflectance of 50% or less and a total light transmittance of 10% or less.

[0012] And by further providing such a shielding layer with a total light reflectance of 50% or less and a total light transmittance of 10% or less between the reflection control layer and the decorative sheet base material, there is a characteristic that the design change due to the reflected light is manifested regardless of the presence or absence of incident light from the back surface due to the shielding property of the shielding layer. As a coloring characteristic of the interference pigment, if the total light reflectance of the inner layer from the design forming layer containing the interference pigment is high, light that becomes the complementary color of the light reflected by the interference pigment in the design forming layer is reflected in the inner layer and the color is canceled, preventing good coloring. For this reason, it is necessary that the total light reflectance of the inner layer from the design forming layer containing the interference pigment is 50% or less, desirably 30% or less, and more desirably 15% or less. At this time, the total light reflectance includes the reflection by the reflection control layer, but the reflection by the reflection control layer is affected by different reflection angles and has a slight influence on the cancellation of color with respect to the reflection outside the reflection control layer. Also, it is important that the total light transmittance is 10% or less, and more desirably 5% or less. If the total light transmittance exceeds 10%, the design by the reflected light may be canceled due to the influence of the base material to be laminated on the decorative sheet, or the incident light from the back surface may not be sufficiently blocked, so the design may deteriorate depending on the material of the laminated base material of the decorative sheet.

[0013] The decorative sheet according to claim 3 is the decorative sheet according to claim 1, characterized in that a transmission part having a total light transmittance of 30% or more is provided on the decorative sheet base material.

[0014] And by having such a configuration, in the invention according to claim 1, it is particularly intended to change the design of the decorative sheet mainly by the transmitted light from the back surface.

[0015] The decorative sheet according to claim 4 is the decorative sheet according to claim 1, characterized in that a shielding layer having a total light reflectance of 50% or less and a total light transmittance of 10% or less is further provided between the reflection control layer and the decorative sheet base material, and a transmission part having a total light transmittance of 30% or more is provided on the decorative sheet base material.

[0016] And by having such a configuration, it becomes a decorative sheet assumed to be used by being adhered to a substrate that can mainly be irradiated with light. This substrate has a low total light reflectance when the light source is off, and when the light source is turned on, it is characterized in that light can be irradiated from the back surface of the decorative sheet. It is usually used by being incorporated into a part of the substrate to which the decorative sheet is adhered. At this time, in a state where the light source of the substrate is off, this decorative sheet exhibits a design with no difference between the concealed part and the transmissive part. However, when the light source of the substrate is turned on, it is observed that the design of the transmissive part seems to disappear and the light of the light source passes through as it is. This feature, for example, by arranging the transmissive part symbolically in the concealed part and turning the incident light from the substrate on and off, when it is off, it has the same design as the concealed layer, but when it is on, it seems that the design disappears and the light rises. It can play the role of doing so.

Advantages of the Invention

[0017] According to the present invention, for example, a decorative sheet suitable for wood-grained building materials and a decorative sheet excellent in the expressiveness of the glossiness of the wood grain can be achieved. Moreover, by providing a design-forming layer containing an interference pigment in the prior application invention by the present inventor described above, the glossiness of the wood grain can be further emphasized.

[0018] Furthermore, by turning the incident light from the decorative sheet substrate on and off, it is possible to impart an effect such that when it is off, it has the same design as the concealed layer, but when it is on, it seems that the design disappears and the light rises.

Brief Description of the Drawings

[0019]

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Embodiments for Carrying Out the Invention

[0020] FIG. 1 is a cross-sectional view showing an embodiment of a cosmetic sheet according to the present invention. On a sheet-like base material 1, a concealment layer 2 is laminated. This concealment layer 2 is rectangular in plan view, and a rectangular image display portion 3 capable of transmitting light is formed so as to pass through an opening 4 formed in the base material 1 on the inner peripheral side, and other portions are made into a shielding portion 5 that does not transmit light. The shielding portion 5 has a total light reflectance of 50% or less and a total light transmittance of 10% or less. Further, as shown in FIG. 2, arbitrary images 6, 6... capable of transmitting light are formed on the shielding portion 5 of the concealment layer 2, and light sources 7 are respectively formed so as to pass through other openings 8 (FIG. 1) formed in the base material 1 so as to face the respective images 6.

[0021] A reflection control layer 9 is laminated on the hidden layer 2, and a design forming layer 10 containing an interference pigment is further laminated on the reflection control layer 9. The interference pigment constituting the design forming layer 10 is obtained by coating mica with titanium oxide, and exhibits an interference color due to the difference in refractive index between mica and titanium oxide. Further, as described above, the interference pigment has little light absorption ability in the pigment itself unlike general process color inks. Therefore, the complementary color of the reflected light is transmitted through the transmitted light, and there is also a usage method in which the pattern observed when not irradiated disappears by irradiating light from the opposite side of the observer by devising the layer structure. When both the image display unit 3 and each light source 7 are turned off, as shown in FIG. 3, the entire surface becomes non-displayed.

[0022] Since the design forming layer 10 contains an interference pigment as described above, as shown in FIG. 4, when the design forming layer 10 is laminated on the reflection control layer 9, the incident angle on the interference pigment in the design forming layer 10 changes, so that the length of the titanium oxide layer in the light path changes, and another color will be developed. As a result, the reflected light becomes a complementary color, the effect of canceling the color is lost, and color is developed.

[0023] Next, examples and comparative examples of the present invention will be described. The materials used in these examples and comparative examples are as follows.

[0024] First, as the ink for the reflection control layer 9, Seiko Advance's VIC ink was used. As the magnetic powder with metallic luster in the medium, 5 wt% of 3D·MG·EL silver (iron oxide vapor-deposited flaky silica) from Scenebow Co., Ltd. (China) with an aspect ratio of 20 and a particle size (D50) of 30 μm was dispersed and used. As the ink for the organic pigment pattern layer, color-tuned products of Seiko Advance's VIC ink in cyan, magenta, yellow, and black were used. As the ink for the concealment layer, Seiko Advance's VIC ink's concealment ink was used. As the comparative concealment layer ink, an ink obtained by diluting Seiko Advance's VIC ink's concealment ink 5 times with VIC medium was used. As the ink for the design formation layer containing interference pigments, in Seiko Advance's VIC ink's medium, as interference pigments, various colors of Merck Iriodin (registered trademark) 205, 215, 225, and 235 were appropriately blended and color-tuned before use. As the ink for the adhesive layer, Seiko Advance's HIM medium was used.

[0025] As the base sheet 1A for Example 1 shown in FIG. 5, a polypropylene sheet 80 μm colored with iron oxide pigment Pigment Brown 43 was used. The total light reflectance of this base sheet 1A was 15%, and the total light transmittance was 3%. Also, as the base sheet 1B for Comparative Example 1 shown in FIG. 6, a polypropylene sheet 80 μm colored with iron oxide pigment Pigment Yellow 42 was used. The total light reflectance of this base sheet 1B was 50%, and the total light transmittance was 6%. Furthermore, as the base sheet 1C for Example 2 shown in FIG. 7, Comparative Example 2 shown in FIG. 8, and Example 3 shown in FIG. 9, a biaxially stretched PET film (Toray Lumirror T60) 50 μm was used. The total light reflectance of this base sheet 1C was 5%, and the total light transmittance was 85%. As the base sheet 1D for Example 4 shown in FIG. 10, a biaxially stretched PET film (with a release coat) 50 μm was used. The total light reflectance of this base sheet 1D was 4%, and the total light transmittance was 85%.

[0026] The following printing plates were used to create the examples and comparative examples. As the silk printing plates for the concealment layer 2 and the reflection control layer 9, a 150-mesh plate (solid plate for the entire surface) was used. Also, as the silk printing plate for pattern printing, a 280-mesh plate (wood grain pattern plate) was used.

[0027] Example 1 (Fig. 5) After printing the ink for the reflection control layer on the base sheet 1A, immediately bring close a neodymium magnet that had been placed on a plate in advance to the surface on the side of the base sheet 1A to apply a magnetic field, and orient the magnetic powder having a metallic luster to form the reflection control layer 9. After drying the reflection control layer 9, the organic pigment pattern layer 11 and the design forming layer 10 containing an interference pigment were printed in order to produce the decorative sheet of Example 1. The total light reflectance of the decorative sheet of Example 1 was 20% and the total light transmittance was 1%.

[0028] Comparative Example 1 (Fig. 6) After printing the ink for the reflection control layer on the base sheet 1B, immediately bring close a neodymium magnet that had been placed on a plate in advance to the surface on the side of the base sheet 1B to apply a magnetic field, and orient the magnetic powder having a metallic luster to form the reflection control layer 9. After drying the reflection control layer 9, the organic pigment pattern layer was printed to produce the decorative sheet of Comparative Example 1. The design was adjusted with the organic pigment pattern layer so as to be as close as possible to the decorative sheet of Example 1A. The total light reflectance of the decorative sheet of Comparative Example 1 was 20% and the total light transmittance was 6%.

[0029] Comparative Evaluation After pasting each sample of Example 1 and Comparative Example 1 on a medium density fiberboard substrate (MDF), the difference in the design change depending on the observation position was observed. As a result of the evaluation, in the decorative sheet according to Comparative Example 1, the three-dimensional effect due to the intensity of the reflected light was emphasized depending on the observation position, but no color tone change was observed. On the other hand, in the decorative sheet according to Example 1, in addition to the three-dimensional effect due to the intensity of the reflected light depending on the observation position, a color tone change was observed, and a more realistic design expression was observed.

[0030] Example 2 (Fig. 7) After printing the ink for the concealment layer on the base material sheet 1C and then immediately printing the ink for the reflection control layer, a neodymium magnet that had been previously placed on a plate was brought close to the surface on the side of the base material sheet 1C to apply a magnetic field, causing the magnetic powder with metallic luster to be oriented to form the reflection control layer 9. After drying the reflection control layer 9, a design formation layer 10 containing an interference pigment was printed to create the decorative sheet of Example 2. The total light reflectance of the decorative sheet of Example 2 was 20%, and the total light transmittance was 1%.

[0031] Comparative Example 2 (Figure 8) After printing the comparative concealment layer ink on the base material sheet 1B and then immediately printing the ink for the reflection control layer, a neodymium magnet that had been previously placed on a plate was brought close to the base material sheet 1B to apply a magnetic field, causing the magnetic powder with metallic luster to be oriented to form the reflection control layer 9. After drying the reflection control layer 9, an organic pigment pattern layer 11 and a design formation layer 10 containing an interference pigment were printed in sequence to create the decorative sheet of Example 3. The total light transmittance of the decorative sheet of Example 3 was 20%.

[0032] Comparative evaluation After attaching each sample of Example 2 and Comparative Example 2 to a white polycarbonate plate base material, the difference in design change depending on the observation position was observed. As a result of the evaluation, the decorative sheet according to Comparative Example 2 had a low color saturation of the pattern and a blurred design expression. In contrast, the decorative sheet according to Example 2 had a high contrast and a realistic design expression with sufficient color saturation.

[0033] Example 3 (Figure 9) After printing the ink for the reflection control layer on the base material sheet 1C, a neodymium magnet that had been previously placed on a plate was brought close to the surface on the side of the base material sheet 1C to apply a magnetic field, causing the magnetic powder with metallic luster to be oriented to form the reflection control layer 9. After drying the reflection control layer 9, a design formation layer 10 containing an interference pigment was printed to create the decorative sheet of Example 3. The total light transmittance of the decorative sheet of Example 3 was 70%.

[0034] Evaluation The cosmetic sheet of Example 3 was attached to a liquid crystal display as an image display device, and the display of the liquid crystal display was turned on and off to observe the surface of the cosmetic sheet. When the display of the liquid crystal display was turned off, the contrast was high as in Example 2, and a realistic design expression with sufficient chroma was observed. Also, when the liquid crystal display was turned on and an image was projected, the design of the cosmetic sheet seemed to disappear and the image displayed on the liquid crystal display was shown.

[0035] Example 4 (Fig. 10) An adhesive layer ink was printed on the base sheet 1D, and then a concealing layer ink was printed in a design excluding the symbol patterns of the image display section and the light source section. Further, after printing a reflective control layer ink, a neodymium magnet that had been previously placed on a plate was immediately brought close to the surface on the side of the base sheet 1D to apply a magnetic field, and magnetic powder having a metallic luster was oriented to form a reflective control layer 9. After drying the reflective control layer 9, a design forming layer 10 containing an interference pigment was printed, and then an adhesive layer ink was printed to produce the cosmetic sheet of Example 4. Among the respective layers of Example 4, as the design forming layer 10 containing an interference pigment, there were used a wood grain pattern with an inverted color of a target color as shown in Fig. 11, a concealing layer 2 having a design excluding the symbol patterns of the image display section 3 and each light source 7 as shown in Fig. 12, and a reflective control layer 9 as shown in Fig. 13. The total light transmittance of the portion excluding the image display section 3 of the concealing layer 2 was 70%, the total light reflectance of the portion on which the concealing layer 2 was placed was 20%, and the total light transmittance was 1%.

[0036] Evaluation After peeling off the base sheet 1D of the cosmetic sheet of Example 4, it was thermally laminated onto a 2 mm thick white carbonate plate shown in Fig. 14 with a liquid crystal monitor and an LED light source incorporated in the image display section and the light source section respectively, and further, the surface side was thermocompression-bonded via an adhesive layer 13 to a surface material 12 such as glass shown in Fig. 15. When the image display section 3 and each light source 8 were turned off, as shown in Fig. 16, it was confirmed that a wood grain pattern was observed over the entire surface. Also, when an image was displayed on the image display section 3, it was confirmed that the wood grain pattern seemed to disappear and the displayed image was visible. Further, when the light sources at the sites where each symbol was missing were turned on, as shown in Fig. 17, it was confirmed that each symbol was observed.

[0037] As described above, according to the cosmetic sheets of the embodiments and each example of the present invention, the design can be changed complicatedly depending on the light incident from the observer side and the transmitted light incident from the opposite side of the observer, and the observation angle of the cosmetic sheet as seen by the observer.

[0038] Note that the present invention is not limited to the above-described embodiments, and various modifications are possible.

Explanation of Signs

[0039] 1 Sheet-like base material 2 Concealing layer 3 Image display section 4 Opening 5 Shielding section 6 Image 7 Light source 8 Opening 9 Reflection control layer 10 Design formation layer 11 Organic pigment pattern layer 12 Surface layer 13 Adhesive layer

Claims

1. It has a design-forming layer and a reflection control layer containing an interference pigment formed by coating mica with titanium oxide from the surface toward the side of the cosmetic sheet base material, and the reflection control layer contains a resin and magnetic powder having a scaly metallic luster, and is formed by orienting the magnetic powder having the metallic luster by applying a magnetic field. A cosmetic sheet characterized by the above.

2. The cosmetic sheet according to claim 1, further comprising a concealment layer between the reflection control layer and the cosmetic sheet base material, the total light reflectance of which is 50% or less and the total light transmittance of which is 10% or less.

3. The cosmetic sheet according to claim 1, wherein the cosmetic sheet base material is provided with a transmission portion having a total light transmittance of 30% or more.

4. The cosmetic sheet according to claim 1, further comprising a concealment layer between the reflection control layer and the cosmetic sheet base material, the total light reflectance of which is 50% or less and the total light transmittance of which is 10% or less, and the cosmetic sheet base material is provided with a transmission portion having a total light transmittance of 30% or more.

Images