Gold decorative film

Abstract

We provide a gold decorative film that can exhibit a vivid gold color. [Solution] A gold decorative film comprising a substrate, a first layer, and a second layer in this order, wherein the first layer is either a color adjustment layer or a metal layer, the second layer is the other of the color adjustment layer or metal layer that is different from the layer selected as the first layer, the color adjustment layer contains Si, the metal layer contains at least one of Ag, Ag alloy, or Al, and the average film thickness of the color adjustment layer is 3.9 to 8.8 nm.

Description

[Technical Field]

[0001] This invention relates to a gold-colored decorative film. More specifically, this invention relates to a gold-colored decorative film capable of exhibiting a vivid gold color. [Background technology]

[0002] Conventionally, decorative members have been developed to achieve specific hues (for example, Patent Document 1). Patent Document 1 discloses a decorative member comprising a light-reflecting layer and a light-absorbing layer provided on the light-reflecting layer and containing Si. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Special Publication No. 2020-522006 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, the decorative member described in Patent Document 1 cannot be made to produce a vivid gold color.

[0005] This invention has been made in view of the above-mentioned conventional inventions, and aims to provide a gold decorative film that can exhibit a vivid gold color. [Means for solving the problem]

[0006] As a result of diligent research, the inventors of the present invention have discovered that a gold decorative film capable of exhibiting a vivid gold color can be obtained by providing a color-adjusting layer of a specific thickness containing Si on a substrate, and by providing a metal layer containing Ag, Ag alloy, or Al, and have completed the present invention. In other words, the gold decorative film of the present invention that solves the above problems mainly includes the following configuration.

[0007] (1) A gold decorative film comprising a substrate, a first layer, and a second layer in this order, wherein the first layer is either a color adjustment layer or a metal layer, the second layer is the other of the color adjustment layer or a metal layer that is different from the layer selected as the first layer, the color adjustment layer contains Si, the metal layer contains at least one of Ag, Ag alloy, or Al, and the average film thickness of the color adjustment layer is 3.9 to 8.8 nm.

[0008] With this configuration, the gold-colored decorative film can exhibit a vivid gold color.

[0009] (2) The gold decorative film according to (1), wherein the average thickness of the color adjustment layer is 4.3 to 5.7 nm.

[0010] With this configuration, the gold decorative film can exhibit a more vibrant gold color.

[0011] (3) The gold decorative film according to (1) or (2), wherein the a* and b* values ​​in the L*a*b* color space of the reflected light of the color adjustment layer on the side opposite to the metal layer satisfy the following formula (1). (a* 2 +b* 2 ) 1 / 2 ≧ 39 Formula (1)

[0012] With this configuration, the gold decorative film can exhibit a more vibrant gold color.

[0013] (4) A gold decorative film according to any of (1) to (3), wherein when the reflectance of the color adjustment layer on the side opposite to the metal layer is R1 at a wavelength of 650 nm and R2 at a wavelength of 500 nm, the following formula (2) is satisfied. (R1-R2) / 150 ≧ 0.22 Equation (2)

[0014] With this configuration, the gold decorative film can exhibit a more vibrant gold color. [Effects of the Invention]

[0015] According to the present invention, a gold decorative film capable of showing a vivid gold color can be provided.

Embodiments for Carrying out the Invention

[0016] <Gold Decorative Film> The gold decorative film of one embodiment of the present invention is a film in which a base material, a first layer, and a second layer are provided in this order. The first layer is either a color tone adjustment layer or a metal layer, and the second layer is the other layer different from the layer selected as the first layer among the color tone adjustment layer or the metal layer. The color tone adjustment layer contains Si. The metal layer contains at least one of Ag, an Ag alloy, or Al. The average film thickness of the color tone adjustment layer is 3.9 to 8.8 nm. Each will be described below.

[0017] (Base Material) The base material is not particularly limited. For example, the base material is made of poly(meth)acrylate such as polymethyl methacrylate (PMMA), polycarbonate, polyethylene terephthalate (PET), polyethylene, polypropylene, polyvinyl chloride, polyimide, polystyrene, polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyethylene naphthalate (PEN), cycloolefin polymer (COP), or the like.

[0018] The thickness of the base material is not particularly limited. For example, the thickness of the base material is preferably 2 μm or more, more preferably 4 μm or more, and even more preferably 12 μm or more. Also, the thickness of the base material is preferably 200 μm or less, more preferably 150 μm or less, and even more preferably 125 μm or less. When the thickness of the base material is within the above range, the film can be lightweight and has excellent flexibility.

[0019] As the substrate, one with desired surface treatment may be used. The surface treatment is not particularly limited. Also, the surface treatment may be performed on each of the surface of the substrate where the first layer is formed and the surface on the opposite side of the surface where the first layer is formed. The surface treatment performed on the surface where the first layer is formed includes matte treatment, satin treatment, embossing treatment, hairline treatment, various coatings (fluorine treatment for imparting antifouling property, hard coat treatment for imparting scratch resistance, antistatic treatment for imparting antistatic property, transfer treatment for imparting transferability, lift-off treatment for expressing partial design property, etc.), and the like. On the other hand, the surface treatment performed on the surface opposite to the surface where the first layer is formed includes matte treatment, satin treatment, embossing treatment, hairline treatment, various coatings (fluorine treatment for imparting antifouling property, hard coat treatment for imparting scratch resistance, antistatic treatment for imparting antistatic property, adhesion treatment for imparting adhesiveness, etc.), and the like. These surface treatments may be performed with one type of treatment, or may be performed in combination of two or more types of treatments.

[0020] Also, various surface treatments may be performed on the substrate. The surface treatment is not particularly limited. For example, the surface treatment includes corona treatment, plasma treatment, ion bombardment treatment, ion implantation treatment, and the like. Thereby, the adhesion between the substrate and the layer formed thereon can be improved.

[0021] The substrate may be a substrate on which an anchor layer is formed in order to improve the adhesion with the first layer described later. In this case, the substrate is composed of a base sheet made of the above material and an anchor layer formed on the base sheet.

[0022] The anchor layer is not particularly limited. For example, the anchor layer may be a raw material having good adhesion with the base sheet and good adhesion with the first layer, such as acrylic resin, nitrocellulose resin, polyurethane resin, polyester resin, styrene-maleic acid resin, chlorinated PP resin, melamine resin, urea resin, vinyl chloride resin, vinyl acetate resin, siloxane resin, epoxy resin, and the like.

[0023] The anchor layer may be given aesthetic appeal by being treated with colorants or metallic pigments. For example, by incorporating a yellow pigment as a colorant, the laminated film can more easily achieve a vivid golden appearance. The type and amount of colorant can be appropriately adjusted according to the desired metallic appearance. Furthermore, the anchor layer may be given functionality such as antistatic effect by being treated with antistatic agents or the like.

[0024] The method for forming the anchor layer is not particularly limited. For example, the anchor layer may be formed by an anchor layer formation process on a substrate sheet, and can be formed by methods such as blade coating, bar coating, gravure coating, reverse roll coating, die coating, or screen printing.

[0025] (Layer 1 and Layer 2) The first layer is either a color adjustment layer or a metal layer, and the second layer is the other layer among the color adjustment layer and metal layer that is different from the layer selected as the first layer. That is, if the first layer is a color adjustment layer, the second layer is a metal layer. In this case, each layer is laminated in the order of substrate, color adjustment layer, and metal layer (first configuration). An observer can observe from the substrate side and see that the hue of the metal layer has been adjusted by the color adjustment layer. On the other hand, if the first layer is a metal layer, the second layer is a color adjustment layer. In this case, each layer is laminated in the order of substrate, metal layer, and color adjustment layer (second configuration). An observer can observe from the color adjustment layer side and see that the hue of the metal layer has been adjusted by the color adjustment layer.

[0026] Among these, the gold decorative film of this embodiment preferably adopts the first configuration. This results in a gold decorative film with superior durability.

[0027] • Color adjustment layer The color adjustment layer contains Si. The color adjustment layer consists substantially of Si only. The purity of Si in the color adjustment layer is preferably 90% by mass or more, more preferably 95% by mass or more, and may be substantially 100% by mass. When the purity of Si is within the above range, the gold decorative film tends to exhibit a vivid gold color. In this embodiment, the color adjustment layer may contain impurities that are unavoidably present, and it may also contain other components as long as they do not hinder the effects of this embodiment.

[0028] The average film thickness of the color adjustment layer should be 3.9 nm or more, preferably 4.3 nm or more. Furthermore, the average film thickness of the color adjustment layer should be 8.8 nm or less, preferably 6.9 nm or less, and more preferably 5.7 nm or less. If the average film thickness of the color adjustment layer is less than 3.9 nm, the gold decorative film is prone to developing a color other than gold (e.g., silver). On the other hand, if the average film thickness of the color adjustment layer exceeds 8.8 nm, the gold decorative film is prone to developing a color other than gold (e.g., silver, purple metallic, reddish-purple metallic, blue metallic, etc.). In this embodiment, the average film thickness of the color adjustment layer can be measured by quantitative analysis using a calibration curve method with an X-ray fluorescence analyzer (e.g., an XRF manufactured by Rigaku Corporation).

[0029] The method for forming the color adjustment layer is not particularly limited. For example, the color adjustment layer can be formed by appropriately using conventionally known techniques such as physical deposition methods like vacuum deposition, sputtering, and ion plating, or chemical deposition methods. Among these, the color adjustment layer in this embodiment is preferably formed by sputtering.

[0030] In the first configuration described above, the color adjustment layer is provided on the substrate. On the other hand, in the second configuration described above, the color adjustment layer is provided on the metal layer, which will be described later.

[0031] ·Metal layer The metal layer contains at least one of Ag, Ag alloy, or Al. The gold decorative film of this embodiment exhibits a gold hue by adjusting the color of Ag, Ag alloy, or Al with a color adjustment layer.

[0032] When the metal layer contains Ag, the purity of Ag is preferably 90% by mass or higher, more preferably 95% by mass or higher, and may be substantially 100% by mass. When the purity of Ag is within the above range, the gold-colored decorative film tends to exhibit a vivid gold color. In this embodiment, the metal layer may contain impurities that are unavoidably present, and other components may be included as long as they do not hinder the effects of this embodiment.

[0033] When the metal layer contains an Ag alloy, the purity of the Ag alloy is preferably 90% by mass or higher, more preferably 95% by mass or higher, and may be substantially 100% by mass. A purity of Ag alloy within the above range makes it easier for the gold-colored decorative film to exhibit a vivid gold color. In this embodiment, the metal layer may contain impurities that are unavoidably present, and other components may be included as long as they do not hinder the effects of this embodiment.

[0034] The other metals that make up the Ag alloy are not particularly limited. For example, other metals include palladium, copper, bismuth, gold, platinum, zinc, tin, titanium, nickel, magnesium, lead, indium, etc. The proportion of other metals contained in the Ag alloy is preferably 0.1% by mass or more, and preferably 10% by mass or less.

[0035] If the metal layer contains Al, the purity of Al is preferably 90% by mass or higher, more preferably 95% by mass or higher, and may be substantially 100% by mass. When the purity of Al is within the above range, the gold decorative film tends to exhibit a vivid gold color. In this embodiment, the metal layer may contain impurities that are unavoidably present, and other components may be included as long as they do not hinder the effects of this embodiment.

[0036] The average thickness of the metal layer is preferably 20 nm or more, more preferably 40 nm or more, and even more preferably 70 nm or more. Furthermore, the average thickness of the metal layer is preferably 150 nm or less, and more preferably 100 nm or less. When the average thickness of the metal layer is within the above range, the gold decorative film tends to exhibit a vivid gold color. In this embodiment, the average thickness of the metal layer can be measured by quantitative analysis using a calibration curve method with an X-ray fluorescence analyzer (for example, an XRF manufactured by Rigaku Corporation).

[0037] The method for forming the metal layer is not particularly limited. For example, the metal layer can be formed by appropriately using conventionally known techniques such as physical deposition methods like vacuum deposition, sputtering, and ion plating, or chemical deposition methods. Among these, in the case of the gold decorative film of this embodiment, if the metal layer is an Ag alloy, it is preferable to form it by sputtering.

[0038] In the first configuration described above, the metal layer is provided on the color adjustment layer. On the other hand, in the second configuration described above, the metal layer is provided on the substrate, and the color adjustment layer is provided on the metal layer.

[0039] The gold decorative film of this embodiment may have other layers in addition to the base material, color adjustment layer, and metal layer, as appropriate. These other layers may include, for example, a rust-preventive layer, a scratch-resistant layer, an adhesive layer, and so on.

[0040] • Rust-preventive layer The rust-preventive layer is preferably provided to prevent corrosion of the metal layer and the color adjustment layer. In the gold decorative film of this embodiment, in the first configuration described above, the rust-preventive layer is preferably provided on the metal layer. On the other hand, in the second configuration described above, the rust-preventive layer is preferably provided on the color adjustment layer.

[0041] The rust-preventive layer is not particularly limited. For example, the rust-preventive layer may consist of elements, oxides, nitrides, or alloys of Ti, Cr, Ni, Si, or Al. In this case, the rust-preventive layer is preferably formed by vapor deposition or sputtering.

[0042] The average thickness of the anti-corrosion layer formed by vapor deposition or sputtering is not particularly limited. For example, the average thickness of the anti-corrosion layer is preferably 0.1 nm or more, and more preferably 1 nm or more. Furthermore, the average thickness of the anti-corrosion layer is preferably 100 nm or less, and more preferably 30 nm or less. When the average thickness of the anti-corrosion layer is within the above range, the gold decorative film is less susceptible to corrosion and more likely to exhibit a vivid gold color. In this embodiment, the average thickness of the anti-corrosion layer can be measured by quantitative analysis using a calibration curve method with an X-ray fluorescence analyzer (for example, an XRF manufactured by Rigaku Corporation).

[0043] On the other hand, the rust-preventive layer may be composed of acrylic resin, nitrocellulose resin, polyurethane resin, polyester resin, styrene-maleic acid resin, chlorinated PP resin, melamine resin, urea resin, vinyl chloride resin, vinyl acetate resin, siloxane resin, or epoxy resin. In this case, the rust-preventive layer is preferably formed by a wet coating method.

[0044] The average thickness of the anti-corrosion layer formed by the wet coating method is not particularly limited. For example, the average thickness of the anti-corrosion layer is preferably 20 nm or more, and more preferably 30 nm or more. Furthermore, the average thickness of the anti-corrosion layer is preferably 5 μm or less, and more preferably 2 μm or less. When the average thickness of the anti-corrosion layer is within the above range, the gold decorative film is less susceptible to corrosion while exhibiting a vivid gold color. In this embodiment, the average thickness of the anti-corrosion layer can be measured by calculating the optical thickness equivalent value using an ultraviolet-visible-near-infrared spectrophotometer (for example, UV3600, manufactured by Shimadzu Corporation).

[0045] According to this embodiment, the gold decorative film can exhibit a vivid gold color. In this embodiment, "gold" can be distinguished from other colors (such as silver, purple metallic, red-violet metallic, blue metallic, etc.) by satisfying the following conditions in the optical reflection characteristic values (a* value, b* value, L* value) in the L*a*b* color space.

[0046] <Criterion for determining whether the color development is gold> A decorative film that satisfies the following (1) to (3). (1) a* value < b* value (2) Reflective b* value: 25.08 or more (3) Reflective L* value: 56.41 to 87.16

[0047] In the gold decorative film of this embodiment, the a* value of the reflected light of the color tone adjustment layer on the side opposite to the metal layer side in the L*a*b* color space is preferably -1.10 or more, more preferably 2.82 or more, and even more preferably 3.80 or more. Also, the a* value is preferably 31.44 or less, more preferably 19.30 or less, and even more preferably 11.36 or less. By the a* value being within the above range, the gold decorative film can exhibit a vivid gold color.

[0048] Also, in the gold decorative film of this embodiment, the b* value of the reflected light of the color tone adjustment layer on the side opposite to the metal layer side in the L*a*b* color space is preferably 25.08 or more, more preferably 38.88 or more, and even more preferably 46.03 or more. Note that the larger the b* value, the more yellowish it becomes. Therefore, the upper limit of the b* value is not particularly limited. For example, the b* value is preferably 59.26 or less, more preferably 58.82 or less, and even more preferably 57.10 or less. By the b* value being within the above range, the gold decorative film can exhibit a vivid gold color.

[0049] Furthermore, in the gold decorative film of this embodiment, the L* value of the reflected light from the color adjustment layer on the side opposite to the metal layer, in the L*a*b* color space, is preferably 56.41 or higher, more preferably 68.39 or higher, and even more preferably 75.39 or higher. In addition, the L* value is preferably 87.16 or lower, more preferably 85.01 or lower, and even more preferably 82.98 or lower. By having the L* value within the above range, the gold decorative film can exhibit a vivid gold color.

[0050] Furthermore, in the gold decorative film of this embodiment, the Y value, which is the total light reflectance of the color adjustment layer on the side opposite to the metal layer, is preferably 24.32 or higher, more preferably 38.50 or higher, and even more preferably 48.89 or higher. In addition, the Y value is preferably 70.34 or lower, more preferably 66.02 or lower, and even more preferably 62.12 or lower. By having the Y value within the above range, the gold decorative film can exhibit a vivid gold color.

[0051] Furthermore, in this embodiment, it is preferable that the a* and b* values ​​in the L*a*b* color space of the reflected light from the color adjustment layer on the side opposite to the metal layer of the gold decorative film satisfy the following formula (1). (a* 2 +b* 2 ) 1 / 2 ≧ 39 Formula (1)

[0052] The optical reflectance characteristics (a*, b*, and L* values) and total light reflectance (Y value) in the L*a*b* color space can be measured using a UV-Vis-Near-Infrared spectrophotometer (UV3600, manufactured by Shimadzu Corporation). In the wavelength range of 300 nm to 800 nm, a baseline is measured using a standard white plate made of barium sulfate, and then the total light reflectance spectrum of each decorative film is measured. In the first configuration, light is incident from the substrate side and the reflected light is measured. In the second configuration, light is incident from the color adjustment layer side and the reflected light is measured.

[0053] In Formula (1), the value of (a * 2 + b * 2 ) 1 / 2 is preferably 39 or more, more preferably 42 or more, and even more preferably 46 or more. Further, in Formula (1), the value of (a * 2 + b * 2 ) 1 / 2 is preferably 62 or less, and more preferably 58 or less. Thereby, the gold decorative film can exhibit a more vivid gold color.

[0054] Further, for the gold decorative film of the present embodiment, when the reflectance of the color tone adjustment layer on the side opposite to the metal layer side at a wavelength of 650 nm is R1 and the reflectance at a wavelength of 500 nm is R2, it preferably satisfies the following formula (2). (R1 - R2) / 150 ≥ 0.22 Formula (2)

[0055] R1 and R2 can be obtained by measuring the total light reflection spectrum of each decorative film after measuring the baseline using a standard white plate formed of barium sulfate in the wavelength range of 300 nm to 800 nm using an ultraviolet-visible near-infrared spectrophotometer (UV3600, manufactured by Shimadzu Corporation). At this time, in the first configuration, light is incident from the substrate side and the reflected light is measured. On the other hand, in the second configuration, light is incident from the color tone adjustment layer side and the reflected light is measured.

[0056] In Formula (2), the value of (R1 - R2) / 150 is preferably 0.22 or more, more preferably 0.26 or more, and even more preferably 0.29 or more. Further, in Formula (2), the value of (R1 - R2) / 150 is preferably 0.40 or less, and more preferably 0.36 or less. Thereby, the gold decorative film can exhibit a more vivid gold color.

Examples

[0057] Hereinafter, the present invention will be described more specifically by way of examples. The present invention is not limited to these examples in any way.

[0058] <Example 1> A substrate (PET film, 50 μm thick) was prepared, and a color adjustment layer made of Si was formed on the substrate by sputtering. The sputtering conditions were as follows: A Si target material was used as the target, and the deposition pressure with Ar gas introduced was 0.2 Pa. The average thickness of the resulting color adjustment layer was 3.9 nm. Next, a metal layer made of Ag alloy (Ag:Pd = 99.9 mass%:0.1 mass%) was formed on the color adjustment layer by sputtering to create a decorative film. The sputtering conditions were as follows: An Ag alloy target material (Ag:Pd = 99.9 mass%:0.1 mass%) was used as the target, and the deposition pressure with Ar gas introduced was 0.3 Pa. The average thickness of the resulting metal layer was 70 nm.

[0059] <Examples 2-17, Comparative Examples 1-9> A decorative film was obtained using the same method as in Example 1, except that the average film thickness of the color adjustment layer was changed as shown in Table 1.

[0060] <Example 18> As shown in Table 2, a decorative film was obtained in the same manner as in Example 1, except that the average film thickness of the color adjustment layer was 5.7 nm and the metal layer was formed as described below. A metal layer made of Ag was formed on the color adjustment layer by vacuum deposition to produce a decorative film. The conditions for the vacuum deposition method were as follows: Ag (purity 99.9% by mass) was used as the deposition material, and the film was deposited by resistance heating deposition. The pressure during film deposition was 0.03 Pa. The average film thickness of the obtained metal layer was 70 nm.

[0061] <Example 19> As shown in Table 2, a decorative film was obtained in the same manner as in Example 18, except that Al (99.9% by mass purity) was used as the vapor deposition material for forming the metal layer, and the average thickness of the metal layer was set to 40 nm.

[0062] <Comparative Examples 10-13> A decorative film was obtained using the same method as in Example 18, except that the average film thickness of the color adjustment layer was changed as shown in Table 2.

[0063] <Comparative Examples 14-17> A decorative film was obtained using the same method as in Example 19, except that the average film thickness of the color adjustment layer was changed as shown in Table 2.

[0064] <Comparative Examples 18-30> A decorative film was obtained in the same manner as in Example 1, except that the average film thickness of the color adjustment layer was changed to that described in Table 3, and the color adjustment layer was formed as described below. A color adjustment layer made of Ti was formed on the substrate by sputtering. The conditions for the sputtering method were as follows: A Ti target material was used as the target, and the pressure during film formation with introduced Ar gas was 0.2 Pa.

[0065] [Table 1]

[0066] [Table 2]

[0067] [Table 3]

[0068] <Example 20> A substrate (PET film, 50 μm thick) was prepared, and a metal layer made of Ag alloy (Ag:Pd = 99.9 mass%:0.1 mass%) was formed on the substrate by sputtering. The sputtering conditions were as follows: An Ag alloy target material (Ag:Pd = 99.9 mass%:0.1 mass%) was used as the target, and the deposition pressure with Ar gas introduced was 0.3 Pa. The average thickness of the resulting metal layer was 70 nm. Next, a color adjustment layer made of Si was formed on the metal layer by sputtering. The sputtering conditions were as follows: A Si target material was used as the target, and the deposition pressure with Ar gas introduced was 0.2 Pa. The average thickness of the resulting color adjustment layer was 5.1 nm.

[0069] <Examples 21-23, Comparative Examples 31-44> A decorative film was obtained using the same method as in Example 20, except that the average film thickness of the color adjustment layer was changed as shown in Table 4.

[0070] [Table 4]

[0071] The decorative films obtained in Examples 1-23 and Comparative Examples 1-44 were evaluated for their optical properties and visual color using the following evaluation methods. The results are shown in Tables 1-4.

[0072] <Optical Properties Evaluation> The optical properties (a*, b*, and L* values) and total reflectance (Y value) of the reflected light from the color adjustment layer on the side opposite to the metal layer in the L*a*b* color space, as well as the reflectance R1 at 650 nm and R2 at 500 nm of the reflected light from the color adjustment layer on the side opposite to the metal layer, were determined using a UV-Vis-Near-Infrared spectrophotometer (UV3600, Shimadzu Corporation) in the wavelength range of 300 nm to 800 nm. After measuring the baseline using a standard white plate made of barium sulfate, the total reflectance spectrum of each decorative film was measured. In this case, for decorative films employing the first configuration (Examples 1-19, Comparative Examples 1-30), the reflected light was measured with light incident from the substrate side. On the other hand, for decorative films employing the second configuration (Examples 20-23, Comparative Examples 31-44), the reflected light was measured with light incident from the color adjustment layer side.

[0073] <Visual color evaluation> The color of the decorative film was evaluated visually. In this case, the decorative film employing the first configuration (Examples 1-19, Comparative Examples 1-30) was observed from the substrate side. On the other hand, the decorative film employing the second configuration (Examples 20-23, Comparative Examples 31-44) was observed from the color adjustment layer side.

[0074] As shown in Tables 1 to 4, the gold-colored decorative films of Examples 1 to 23 of the present invention exhibited a vivid gold coloration.

Claims

1. The base material, the first layer, and the second layer are provided in this order. The first layer is either a color adjustment layer or a metal layer. The second layer is a color adjustment layer or a metal layer, which is different from the layer selected as the first layer. The aforementioned color adjustment layer contains Si, The aforementioned metal layer comprises at least one of Ag, Ag alloy, or Al. A gold decorative film having an average film thickness of 3.9 to 8.8 nm for the color adjustment layer.

2. The gold decorative film according to claim 1, wherein the average film thickness of the color adjustment layer is 4.3 to 5.7 nm.

3. The gold decorative film according to claim 1 or 2, wherein the a* and b* values ​​in the L*a*b* color space of the reflected light of the color adjustment layer on the side opposite to the metal layer satisfy the following formula (1). (a*) 2 +b* 2 ) 1 / 2 ≧ 39 (1)

4. The gold decorative film according to claim 1 or 2, wherein when the reflectance of the color adjustment layer on the side opposite to the metal layer is R1 at a wavelength of 650 nm and R2 at a wavelength of 500 nm, the following formula (2) is satisfied. (R1-R2) / 150 ≧ 0.22 Formula (2)

Images