Gold decorative film

Abstract

To provide a gold decorative film capable of exhibiting a vivid gold color. [Solution] A gold decorative film comprising a substrate, a first layer, and a second layer arranged in this order, the first layer being either a color-adjusting layer or a metal layer, the second layer being the other of the color-adjusting layer and the metal layer that is different from the layer selected as the first layer, the color-adjusting layer containing Si, the metal layer containing at least one of Ag, an Ag alloy, and Al, and the average film thickness of the color-adjusting layer being 3.9 to 8.8 nm.

Description

[Technical Field]

[0001] The present invention relates to a gold decorative film, and more particularly to a gold decorative film that can exhibit a vivid gold color. [Background technology]

[0002] Decorative members for achieving specific hues have been developed (for example, Patent Document 1). Patent Document 1 discloses a decorative member including a light-reflecting layer and a light-absorbing layer that is provided on the light-reflecting layer and contains Si. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2020-522006 Summary of the Invention [Problem to be solved by the invention]

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

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

[0006] After extensive research, the inventors discovered that a gold decorative film capable of exhibiting a vivid gold color can be obtained by providing a substrate with a color-adjusting layer containing Si and having a specific thickness, and also providing a metal layer containing Ag, an Ag alloy, or Al, and thus completed the present invention. That is, the gold decorative film of the present invention, which solves the above-mentioned problems, mainly includes the following components.

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

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

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

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

[0013] (4) A gold decorative film according to any one of (1) to (3), which satisfies the following formula (2), where R1 is the reflectance at a wavelength of 650 nm of light reflected by the color-adjusting layer on the side opposite to the metal layer side, and R2 is the reflectance at a wavelength of 500 nm. (R1-R2) / 150 ≧ 0.22 Equation (2)

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

[0015] According to the present invention, it is possible to provide a gold decorative film that can exhibit a vivid gold color. DETAILED DESCRIPTION OF THE INVENTION

[0016] <Golden decorative film> The gold decorative film of one embodiment of the present invention is a film having a substrate, a first layer, and a second layer provided in this order. The first layer is either a color-adjusting layer or a metal layer, and the second layer is the other of the color-adjusting layer and the metal layer, which is different from the layer selected as the first layer. The color-adjusting layer contains Si. The metal layer contains at least one of Ag, an Ag alloy, and Al. The average film thickness of the color-adjusting layer is 3.9 to 8.8 nm. Each of these layers will be described below.

[0017] (base material) The substrate is not particularly limited. For example, the substrate may be made of a poly(meth)acrylic acid ester 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 substrate is not particularly limited. For example, the thickness of the substrate is preferably 2 μm or more, more preferably 4 μm or more, and even more preferably 12 μm or more. The thickness of the substrate 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 substrate is within the above range, the film can be made lighter and has excellent flexibility.

[0019] The substrate may be subjected to a desired surface treatment. The type of surface treatment is not particularly limited. The surface treatment may be performed on both the surface of the substrate on which the first layer is formed and the surface opposite the surface on which the first layer is formed. Surface treatments performed on the surface on which the first layer is formed include matte finish, satin finish, embossing, hairline finish, various coatings (fluorine finish for imparting antifouling properties, hard coat finish for imparting scratch resistance, antistatic finish for imparting antistatic properties, transfer processing for imparting transferability, lift-off processing for expressing partial design, etc.). On the other hand, surface treatments performed on the surface opposite the surface on which the first layer is formed include matte finish, satin finish, embossing, hairline finish, various coatings (fluorine finish for imparting antifouling properties, hard coat finish for imparting scratch resistance, antistatic finish for imparting antistatic properties, adhesive finish for imparting adhesiveness, etc.). One type of these surface treatments may be performed, or two or more types of treatments may be combined.

[0020] The substrate may be subjected to various surface treatments. The surface treatment is not particularly limited. Examples of the surface treatment include corona treatment, plasma treatment, ion bombardment treatment, and ion implantation treatment. This can improve the adhesion of the substrate to a layer formed thereon.

[0021] The substrate may be a substrate on which an anchor layer is formed to improve adhesion with the first layer described below. 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 made of a material that has good adhesion to the base sheet and also to the first layer, such as an acrylic resin, a nitrocellulose resin, a polyurethane resin, a polyester resin, a styrene-maleic acid resin, a chlorinated PP resin, a melamine resin, a urea resin, a vinyl chloride resin, a vinyl acetate resin, a siloxane resin, or an epoxy resin.

[0023] The anchor layer may be provided with a design feature by adding a colorant or a metallic pigment. For example, by adding a yellow pigment as a colorant, the laminate film can easily express a more vivid golden appearance. The type and content of the colorant can be appropriately adjusted depending on the desired metallic appearance. Furthermore, the anchor layer may be provided with functionality such as an antistatic effect by adding an antistatic agent or the like.

[0024] The method for forming the anchor layer is not particularly limited. For example, the anchor layer can be formed by an anchor layer forming step of forming an anchor layer on a base sheet, and can be formed by a blade coating method, a bar coating method, a gravure coating method, a reverse roll coating method, a die coating method, screen printing, or the like.

[0025] (1st and 2nd layers) The first layer is either a color adjusting layer or a metal layer, and the second layer is the other of the color adjusting layer and the metal layer, different from the layer selected as the first layer. That is, when the first layer is a color adjusting layer, the second layer is a metal layer. In this case, the layers are stacked in the order of base material, color adjusting layer, and metal layer (first configuration). An observer can observe from the base material side and see the hue of the metal layer adjusted by the color adjusting layer. On the other hand, when the first layer is a metal layer, the second layer is a color adjusting layer. In this case, the layers are stacked in the order of base material, metal layer, and color adjusting layer (second configuration). An observer can observe from the color adjusting layer side and see the hue of the metal layer adjusted by the color adjusting layer.

[0026] Among these, it is preferable that the gold decorative film of this embodiment adopts the first configuration, which provides the gold decorative film with better durability.

[0027] Color adjustment layer The color-adjusting layer contains Si. The color-adjusting layer consists essentially of Si. The purity of Si in the color-adjusting 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-adjusting layer may contain unavoidable impurities, and may also contain other components as long as they do not impair the effects of this embodiment.

[0028] The average thickness of the color-adjusting layer may be 3.9 nm or more, and preferably 4.3 nm or more. The average thickness of the color-adjusting layer may be 8.8 nm or less, and preferably 6.9 nm or less, and more preferably 5.7 nm or less. When the average thickness of the color-adjusting layer is less than 3.9 nm, the gold decorative film tends to develop a color other than gold (e.g., silver). On the other hand, when the average thickness of the color-adjusting layer exceeds 8.8 nm, the gold decorative film tends to develop a color other than gold (e.g., silver, metallic purple, metallic reddish purple, metallic blue, etc.). In this embodiment, the average thickness of the color-adjusting layer can be measured by quantitative analysis using a calibration curve method using a fluorescent X-ray measuring device (e.g., XRF manufactured by Rigaku Corporation).

[0029] The method for forming the color-adjusting layer is not particularly limited. For example, the color-adjusting layer can be formed by appropriately using a conventionally known technique, such as a physical vapor deposition method such as a vacuum deposition method, a sputtering method, or an ion plating method, or a chemical vapor deposition method. Among these, the color-adjusting layer of the present embodiment is preferably formed by a sputtering method.

[0030] In the first configuration, the color-adjusting layer is provided on a substrate, whereas in the second configuration, the color-adjusting layer is provided on a metal layer, which will be described later.

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

[0032] When the metal layer contains Ag, the purity of Ag 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 Ag is within the above range, the gold decorative film tends to exhibit a vivid gold color. In this embodiment, the metal layer may contain unavoidable impurities, and may also contain other components as long as the effects of this embodiment are not impaired.

[0033] When the metal layer contains an Ag alloy, the purity of the Ag alloy 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 the Ag alloy is within the above range, the gold decorative film is likely to exhibit a vivid gold color. In this embodiment, the metal layer may contain unavoidable impurities, and may also contain other components as long as they do not impair the effects of this embodiment.

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

[0035] When the metal layer contains Al, the purity of Al 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 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 unavoidable impurities, and may also contain other components as long as they do not impair 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. 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 using a fluorescent X-ray measuring device (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 a conventionally known technique, such as a physical vapor deposition method such as a vacuum deposition method, a sputtering method, or an ion plating method, or a chemical vapor deposition method. Among these, when the gold decorative film of this embodiment has a metal layer made of an Ag alloy, it is preferably formed by a sputtering method.

[0038] In the first configuration, the metal layer is provided on the color-adjusting layer, whereas in the second configuration, the metal layer is provided on a substrate, and the color-adjusting layer is provided on the metal layer.

[0039] The gold decorative film of this embodiment may be provided with other layers as appropriate in addition to the substrate, color-adjusting layer, and metal layer, such as an anti-corrosion layer, a scratch-resistant layer, and an adhesive layer.

[0040] Anti-rust layer The anticorrosion layer is preferably provided to prevent corrosion of the metal layer and the color-adjusting layer. In the gold decorative film of this embodiment, in the first configuration, the anticorrosion layer is preferably provided on the metal layer. On the other hand, in the second configuration, the anticorrosion layer is preferably provided on the color-adjusting layer.

[0041] The anticorrosion layer is not particularly limited. For example, the anticorrosion layer may be made of an element, oxide, nitride, or alloy of Ti, Cr, Ni, Si, or Al. In this case, the anticorrosion layer is preferably formed by vapor deposition or sputtering.

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

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

[0044] The average thickness of the anticorrosion layer formed by the wet coating method is not particularly limited. For example, the average thickness of the anticorrosion layer is preferably 20 nm or more, more preferably 30 nm or more. Furthermore, the average thickness of the anticorrosion layer is preferably 5 μm or less, more preferably 2 μm or less. When the average thickness of the anticorrosion layer is within the above range, the gold decorative film is likely to exhibit a vivid gold color while being protected from corrosion. In this embodiment, the average thickness of the anticorrosion layer can be measured by calculating the optical film thickness equivalent value using an ultraviolet-visible-near-infrared spectrophotometer (e.g., 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] <Criteria 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. When the a* value is 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. When the b* value is 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 in the L*a*b* color space of the light reflected by the color-adjusting layer on the side opposite the metal layer is preferably 56.41 or more, more preferably 68.39 or more, and even more preferably 75.39 or more. Furthermore, the L* value is preferably 87.16 or less, more preferably 85.01 or less, and even more preferably 82.98 or less. 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-adjusting layer on the side opposite to the metal layer, is preferably 24.32 or more, more preferably 38.50 or more, and even more preferably 48.89 or more. Furthermore, the Y value is preferably 70.34 or less, more preferably 66.02 or less, and even more preferably 62.12 or less. By having the Y value within the above range, the gold decorative film can exhibit a vivid gold color.

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

[0052] The optical reflectance characteristics (a*, b*, L*) and total light reflectance (Y) in the L*a*b* color space can be measured using an ultraviolet-visible-near-infrared spectrophotometer (UV3600, manufactured by Shimadzu Corporation) in the wavelength range of 300 nm to 800 nm. After measuring a baseline using a standard white plate made of barium sulfate, the total light reflectance spectrum of each decorative film can be measured. In this case, in the first configuration, light is incident from the substrate side and reflected light is measured. Meanwhile, in the second configuration, light is incident from the color-adjusting layer side and reflected light is measured.

[0053] In equation (1), (a* 2 +b* 2 ) 1 / 2 The value of is preferably 39 or more, more preferably 42 or more, and even more preferably 46 or more. 2 +b* 2 ) 1 / 2 The value of is preferably equal to or less than 62, and more preferably equal to or less than 58. This allows the gold decorative film to exhibit a more vivid gold color.

[0054] Furthermore, it is preferable that the gold decorative film of this embodiment satisfies the following formula (2), where R1 is the reflectance at a wavelength of 650 nm of the reflected light from the color adjustment layer on the side opposite to the metal layer, and R2 is the reflectance at a wavelength of 500 nm. (R1-R2) / 150 ≧ 0.22 Equation (2)

[0055] R1 and R2 can be determined by measuring the total light reflectance spectrum of each decorative film using an ultraviolet-visible-near-infrared spectrophotometer (UV3600, manufactured by Shimadzu Corporation) in the wavelength range of 300 nm to 800 nm, after measuring a baseline using a standard white plate made of barium sulfate. In this case, in the first configuration, light is incident from the substrate side and reflected light is measured. On the other hand, in the second configuration, light is incident from the color-adjusting layer side and 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. In formula (2), the value of (R1-R2) / 150 is preferably 0.40 or less, and more preferably 0.36 or less. This allows the gold decorative film to exhibit a more vivid gold color. [Example]

[0057] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples in any way.

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

[0059] <Examples 2 to 17 and Comparative Examples 1 to 9> A decorative film was obtained in the same manner as in Example 1, except that the average film thickness of the color-adjusting layer was changed to that 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 thickness of the color-adjusting 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-adjusting layer by vacuum deposition, to produce a decorative film. The conditions for the vacuum deposition were as follows: Ag (purity 99.9% by mass) was used as the deposition material, and the film was formed by resistance heating deposition. The pressure during film formation was 0.03 Pa. The average 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 (purity 99.9% by mass) was used as the vapor deposition material for forming the metal layer and the average film thickness of the metal layer was 40 nm.

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

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

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

[0065] [Table 1]

[0066] [Table 2]

[0067] [Table 3]

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

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

[0070] [Table 4]

[0071] The decorative films obtained in Examples 1 to 23 and Comparative Examples 1 to 44 were evaluated for optical properties and visual color tone by the following evaluation methods. The results are shown in Tables 1 to 4, respectively.

[0072] <Optical property evaluation> The optical characteristic values ​​(a*, b*, L*) and total light reflectance (Y) in the L*a*b* color space of the light reflected from the color-adjusting layer on the side opposite the metal layer, as well as the reflectance R1 at a wavelength of 650 nm and the reflectance R2 at a wavelength of 500 nm of the light reflected from the color-adjusting layer on the side opposite the metal layer, were measured using an ultraviolet-visible-near-infrared spectrophotometer (UV3600, manufactured by Shimadzu Corporation) in the wavelength range of 300 nm to 800 nm. After measuring a baseline using a standard white plate made of barium sulfate, the total light reflectance spectrum of each decorative film was then measured. For decorative films employing the first configuration (Examples 1 to 19, Comparative Examples 1 to 30), light was incident from the substrate side to measure the reflected light. For decorative films employing the second configuration (Examples 20 to 23, Comparative Examples 31 to 44), light was incident from the color-adjusting layer side to measure the reflected light.

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

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

Claims

1. a substrate, a first layer, and a second layer are provided in this order; the first layer is either a color adjusting layer or a metal layer, the second layer is a color-adjusting layer or a metal layer, which is the other layer different from the layer selected as the first layer, the color-adjusting layer contains Si, the metal layer contains at least one of Ag and an Ag alloy; the color-adjusting layer has an average film thickness of 3.9 to 8.8 nm; When viewed from the color adjusting layer along the lamination direction of the metal layer, the color is gold, A gold decorative film, wherein the a* value and b* value in the L*a*b* color space of the reflected light of the color adjusting layer on the side opposite to the metal layer side satisfy the following formula (1): (a* 2 + b* 2 ) 1 / 2 ≧ 39 Formula (1)

2. 2. The gold decorative film according to claim 1, wherein the color-adjusting layer has an average film thickness of 4.3 to 5.7 nm.

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

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