Laminated films, metallic products, metallic signs

Abstract

The present invention relates to a laminated film, comprising: a substrate, an adhesion-promoting layer, a metal vapor-deposited layer and an adhesive layer, wherein the metal vapor-deposited layer contains indium, has an OD value of less than or equal to 1.2, and the OD value and the a* value and b* value of the transmitted light in the L*a*b* color space satisfy the following formula (1); OD value×(a* 2 +b* 2 ) 1 / 2 ≤6.7(1).

Description

Technical Field

[0001] The present invention relates to a laminated film, a metallic product, and a metallic signboard. More specifically, the present invention relates to a laminated film, a metallic product, and a metallic signboard having excellent molding processability, which can present a metallic appearance during the day after being processed into a molded product and can well transmit light from a back light source at night. Background Art

[0002] So far, metal texture products using metal decorative materials have been developed for indoor and outdoor signs, etc., which can present a metallic appearance during the day and transmit light from a back light source at night. Metal texture products using a laminated film as such a metal decorative material are known, and the laminated film uses an aluminum thin film. In addition, in general, in addition to a laminated film of aluminum, a laminated film of chromium or indium is sometimes used to give a metallic appearance (Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent document 1: Japanese Patent Application Publication No. 2006-26946.

[0006] However, the laminated film with aluminum vapor deposition has poor followability when it is molded into various three-dimensional shapes, and is prone to appearance defects such as whitening after molding. Therefore, in the case of aluminum vapor deposition, a method of providing a vapor deposition layer by batch vapor deposition is adopted. However, the durability of the obtained aluminum film is poor, so an outer coating is required. In addition, the cost of manufacturing a laminated film by batch vapor deposition is also high. Summary of the invention

[0007] In addition, other metals such as indium can be used to replace aluminum by vapor deposition. However, for example, a laminated film with a vapor deposition layer composed of indium has poor light transmittance compared to the case of using aluminum. Therefore, if it is to be used for the above-mentioned metal texture products such as signboards, it is considered that the laminated film using indium is not suitable.

[0008] The present invention is completed in view of such existing inventions, and its purpose is to provide a laminated film, a metallic product, and a metallic signboard that have excellent molding processing performance, can present a metallic appearance during the day after being processed into a molded product, and can well transmit light from a back light source at night.

[0009] After conducting in-depth research, the inventors of the present invention finally found that by using indium as the metal vapor-deposited layer, adjusting the OD (optical density) value to below a specified range, and adjusting the OD value and the a* value and b* value of the transmitted light in the L*a*b* color space to satisfy a specified relationship, the molding processing performance is excellent, and after being processed into a molded product, it can present a metallic appearance during the day and can well transmit light from the back light source at night, thereby completing the present invention.

[0010] The laminated film of the present invention that solves the above-mentioned technical problems comprises: a substrate, an adhesion-promoting layer, a metal vapor-deposited layer and an adhesive layer, wherein the metal vapor-deposited layer contains indium, has an OD value of less than or equal to 1.2, and the OD value and the a* value and b* value of the transmitted light in the L*a*b* color space satisfy the following formula (1);

[0011] OD value × (a * 2 +b* 2 ) 1 / 2 ≤6.7 (1).

[0012] The metallic product of the present invention that solves the above-mentioned technical problems is a metallic product using the above-mentioned laminated film.

[0013] The metallic signboard of the present invention that solves the above-mentioned technical problems is a metallic signboard using the above-mentioned laminated film. DETAILED DESCRIPTION

[0014] <Laminated Film>

[0015] A laminated film according to one embodiment of the present invention comprises a substrate, an adhesion layer, a metal vapor-deposited layer and an adhesive layer. The metal vapor-deposited layer contains indium. The OD value is less than or equal to 1.2. The OD value and the a* value and b* value of the transmitted light in the L*a*b* color space satisfy the following formula (1). Each of them is described below.

[0016] OD value × (a * 2 +b* 2 ) 1 / 2 ≤6.7 (1).

[0017] (Base material)

[0018] The substrate is not particularly limited. For example, the substrate is composed of poly (meth) acrylates such as polymethyl methacrylate (PMMA), polycarbonate, polyethylene terephthalate, polyethylene 2,6-naphthalate, polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), ethylene-tetrafluoroethylene copolymer (ETFE), ethylene-chlorotrifluoroethylene copolymer (ECTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), etc.

[0019] The thickness of the substrate is not particularly limited. For example, the thickness of the substrate is preferably 1.0 to 300 μm. When the thickness of the substrate is within the above range, the laminate film has excellent scratch resistance and abrasion resistance.

[0020] The substrate may be a substrate that has been subjected to a desired surface treatment. The surface treatment is not particularly limited. For example, the surface treatment may be matte treatment, satin treatment, embossing treatment, hairline treatment, etc. In addition, the surface of the substrate (the surface opposite to the surface on which the adhesion-promoting layer is formed) may be subjected to surface treatments such as various coatings (fluorine treatment, hard coating treatment, etc.), transfer, etc. Thus, various designs and functionalities can be imparted to the surface of the substrate.

[0021] (Adhesion-promoting layer)

[0022] The adhesion promoting layer is provided to improve the adhesion between the substrate and the metal vapor deposited layer.

[0023] There is no particular limitation on the adhesion-promoting layer. For example, the adhesion-promoting layer can be made of a material that has good adhesion to the substrate and good receptivity to indium constituting the metal vapor-deposited layer, such as acrylic resin, nitrocellulose resin, polyurethane resin, polyester resin, styrene-maleic acid resin, chlorinated PP resin, etc.

[0024] The thickness of the anchor layer is not particularly limited. For example, the thickness of the anchor layer is preferably 0.1 to 3 μm. When the thickness of the anchor layer is within the above range, the laminate film has excellent adhesion to the substrate and the metal vapor-deposited layer.

[0025] The adhesion layer can be given design by adding a colorant or a metallic pigment. For example, by adding a yellow pigment as a colorant, the laminated film can present a golden appearance. The type and content of the colorant can be appropriately adjusted according to the desired metallic appearance. In addition, the adhesion layer can also be given an antistatic effect and other functions by adding an antistatic agent.

[0026] (Metal deposition layer)

[0027] The metal vapor-deposited layer contains indium. Indium can be contained in the form of oxide or nitride. By making the metal vapor-deposited layer contain indium, the obtained laminated film is not prone to appearance defects such as whitening during molding and has excellent molding performance. As a result, the laminated film can be easily processed into various three-dimensional shapes.

[0028] In addition, the metal vapor deposition layer may contain various non-metals, metals, metal oxides and metal nitrides in addition to indium. There is no particular limitation on non-metals, metals, etc. For example, non-metals are amorphous carbon (DLC) and its complexes, and metals are metals such as gold, silver, platinum, tin, chromium, silicon, titanium, zinc, aluminum and magnesium, as well as their oxides and nitrides.

[0029] The content of indium in the metal vapor-deposited layer is not particularly limited. For example, the content of indium in the metal vapor-deposited layer is preferably greater than or equal to 95% by mass, more preferably greater than or equal to 98% by mass. The content of indium may be 100% by mass.

[0030] There is no particular limitation on the thickness of the metal vapor-deposited layer. For example, the thickness of the metal vapor-deposited layer is preferably greater than or equal to 10 nm, more preferably greater than or equal to 15 nm. In addition, the thickness of the metal vapor-deposited layer is preferably less than or equal to 35 nm, more preferably less than or equal to 30 nm. By making the thickness of the metal vapor-deposited layer within the above range, the metal vapor-deposited layer easily has both metallic luster and formability. In addition, the obtained laminated film not only increases the transmittance, but also reduces the transmission haze. As a result, the blurriness of the obtained transmitted light is reduced, and a good color tone can be presented.

[0031] (Adhesive layer)

[0032] The adhesive layer is provided to bond the laminate film to an adherend.

[0033] There is no particular limitation on the adhesive layer. For example, the adhesive layer is composed of various adhesives, tackifiers, pressure-sensitive adhesives (PSA: Pressure Sensitive Adhesive), etc. There is no particular limitation on the adhesive. For example, the adhesive is composed of acrylic resins, polyurethane resins, polyurethane-modified polyester resins, polyester resins, epoxy resins, ethylene-vinyl acetate copolymer resins (EVA), vinyl resins (vinyl chloride, vinyl acetate, vinyl chloride-vinyl acetate copolymer resins), styrene-ethylene-butylene copolymer resins, polyvinyl alcohol resins, polyacrylamide resins, polyacrylamide resins, isobutylene rubber, isoprene rubber, natural rubber, SBR, NBR, silicone rubber and other resins. These resins can be appropriately dissolved in a solvent for use, or they can be used in a solvent-free manner.

[0034] The above-mentioned adhesive layer preferably contains a colorant. Generally, when a laminated film provided with a metal vapor-deposited layer composed of indium transmits light from a light source from its back side, the light becomes brown in color, and the color is easily deteriorated. On the other hand, by adding a colorant to the adhesive layer, the hue of the transmitted light from the light source can be adjusted. As a result, the laminated film can be adjusted to transmit the transmitted light of the desired hue (e.g., a blue hue, etc.).

[0035] There is no particular limitation on the colorant. The colorant can be appropriately selected in consideration of the desired hue of the transmitted light. For example, when a blue hue is desired, the colorant preferably contains at least one of a blue pigment or a magenta pigment. Thus, the transmitted light from the light source can be adjusted to a blue hue using the colorant.

[0036] The types of the blue pigment and the magenta pigment are not particularly limited and may be appropriately selected according to the desired color tone of the transmitted light.

[0037] There is no particular limitation on the content of the blue pigment and the magenta pigment. The content of the blue pigment and the magenta pigment can be appropriately selected according to the desired hue of the transmitted light. For example, the content of the blue pigment and the magenta pigment in the resin solution constituting the adhesive layer is preferably greater than 0% by mass and less than or equal to 8% by mass. Thus, the hue of the transmitted light can be appropriately given a blue hue.

[0038] There is no particular limitation on the method for forming the adhesive layer. For example, the adhesive layer can be formed by applying a resin solution for forming the adhesive layer dissolved in a suitable solvent to a diaphragm described later using a roll coater, and then laminating the diaphragm formed with the adhesive layer to the metal vapor-deposited layer. It can also be formed by directly applying the resin solution on the metal vapor-deposited layer. In addition, the adhesive layer can also be formed using a ready-made product having an adhesive layer already provided on the diaphragm. The method for forming the adhesive layer can be appropriately selected according to the characteristics of the adhesive or adhesive used.

[0039] There is no particular limitation on the thickness of the adhesive layer. For example, the thickness of the adhesive layer is preferably greater than or equal to 10 μm, more preferably greater than or equal to 15 μm. In addition, the thickness of the adhesive layer is preferably less than or equal to 60 μm, more preferably less than or equal to 55 μm. By making the thickness of the adhesive layer within the above range, the appearance and adhesion of the obtained laminated film during bonding will be more excellent.

[0040] In addition to the above-mentioned colorants, the adhesive layer can also be given design properties by adding metal pigments. In addition, the adhesive layer can also be given antistatic effects and other functions by adding antistatic agents, etc. Thus, the lamination adaptability of the adhesive layer is improved.

[0041] Returning to the description of the laminated film as a whole, the OD (Optical Density) value of the laminated film can be less than or equal to 1.2, preferably less than or equal to 1.1. The OD value is a parameter indicating light transmittance, and can be measured, for example, using a transmission densitometer (DM-500, manufactured by Dainippon Screen Manufacturing Co., Ltd.). If the OD value of the laminated film of the present embodiment is greater than 1.2, it is difficult for light from the light source to be transmitted when it is processed into a molded product. In contrast, by making the OD value of the laminated film within the above range, it is easy for light from the light source to be transmitted appropriately when it is processed into a molded product.

[0042] The OD value of the laminated film of the present embodiment and the a* value and b* value of the transmitted light in the L*a*b* color space may satisfy the following formula (1), and preferably satisfy the following formula (2).

[0043] OD value × (a * 2 +b* 2 ) 1 / 2 ≤6.7 (1).

[0044] OD value × (a * 2 +b* 2 ) 1 / 2 ≤6.0 (2).

[0045] The laminated film of this embodiment satisfies the formula (1) in terms of OD value and a* and b* values ​​of transmitted light in the L*a*b* color space. When processed into a molded product, it can easily present a metallic appearance during the day and can well transmit light from a light source at night.

[0046] As defined in equations (1) and (2), when the OD value of the laminated film of this embodiment is slightly smaller than 1.2 (for example, when the OD value is about 1.0), light from the light source is less likely to be transmitted than when the OD value is smaller. As a result, "(a* 2 +b* 2 ) 1 / 2 " value (i.e., the color tone of the transmitted light) becomes more affected. Therefore, in order to satisfy "OD value × (a * 2 +b* 2 ) 1 / 2 ≤6.7","(a* 2 +b* 2 ) 1 / 2 " a* and b* in it are preferably within ±4.0, more preferably within ±3.5. Therefore, the laminated film of this embodiment can easily satisfy formula (1) even when the OD value is relatively large, and can easily take into account both daytime reflectivity and nighttime transmittance.

[0047] On the other hand, when the OD value is smaller than 1.2 (for example, when the OD value is about 0.8), the light from the light source is more likely to be transmitted than when the OD value is slightly larger (for example, about 1.0). 2 +b* 2 ) 1 / 2 "The value (i.e., the color tone of the transmitted light) becomes smaller. Therefore, in order to satisfy "OD value × (a * 2 +b* 2 ) 1 / 2 ≤6.7","(a* 2 +b* 2 ) 1 / 2 " a* and b* in " are preferably both within ±5.5, more preferably within ±5.0. Therefore, the laminated film of this embodiment can easily satisfy formula (1) even when the OD value is relatively small, and can easily take into account both daytime reflectivity and nighttime transmittance.

[0048] In addition, the brightness L* value of the reflected light in the L*a*b* color space of the laminated film of this embodiment is preferably greater than or equal to 60, and more preferably greater than or equal to 70. By making the brightness L* value of the reflected light within the above range, the laminated film not only has excellent light transmittance, but also improves the reflected brightness (reflectivity). As a result, the laminated film is more likely to present a metallic appearance during the day.

[0049] In the present embodiment, both the "transmitted light and reflected light in the L*a*b* color space" can be measured using, for example, an ultraviolet-visible-near-infrared spectrophotometer (UV-3600, manufactured by Shimadzu Corporation) based on the standards of JIS K 8722 and CIE1976, under the conditions that the light source is a halogen lamp, the reflected light is an integrating sphere light including regular reflection (geometric condition d (8°: di)), and the transmitted light is an integrating sphere light including regular transmission (geometric condition f (0°: di)).

[0050] As described above, the metal vapor-deposited layer of the laminated film of the present embodiment contains indium. Therefore, compared with the metal vapor-deposited layer composed of aluminum, etc., the laminated film has excellent followability to the three-dimensional shape during the molding process. As a result, whitening is not easy to occur, and it is easy to obtain a molded product with excellent appearance. In addition, the OD value of the laminated film is included in the prescribed numerical range and satisfies the above formula (1) composed of the OD value and the a* value and b* value of the transmitted light in the L*a*b* color space. As a result, the laminated film can obtain a metallic appearance during the day and can transmit light from the light source well at night.

[0051] Furthermore, since the laminated film of the present embodiment can obtain a metallic appearance during the day and can well transmit light from a light source at night, it can be very suitably used in applications such as metallic products having various three-dimensional shapes.

[0052] The metallic product according to one embodiment of the present invention is a metallic product using the laminate film. The metallic product is produced by attaching the laminate film to an adherend.

[0053] There is no particular limitation on the adherend. For example, the adherend is polypropylene resin, acrylic resin, polystyrene resin, polyacrylonitrile-styrene resin, polyacrylonitrile-butadiene-styrene resin, etc. The adherend is preferably light-transmissive so that after being processed into a molded product, it can transmit light irradiated from the back by a light source.

[0054] The obtained metallic product has a metallic appearance during the day due to the effect of the metal vapor deposition layer containing indium. On the other hand, at night, light can be transmitted to the outside by irradiating light from the back with a light source.

[0055] There is no particular limitation on the metallic product. For example, the metallic product is a metallic signboard, metallic interior and exterior automotive decorative materials, metallic home appliances, metallic entertainment products, metallic building materials, etc. Among them, when the metallic product is a metallic signboard using the laminated film, it can show an excellent metallic appearance during the day and excellent light transmittance at night.

[0056] <Method for producing laminated film and metallic product>

[0057] There is no particular limitation on the manufacturing method of the laminated film and the metallic product. For example, the laminated film mainly includes: a step of forming an adhesion layer on the substrate (adhesion layer forming step), a step of forming a metal vapor-deposited layer on the adhesion layer (vapor deposition step), and a step of forming an adhesive layer on the metal vapor-deposited layer (adhesive layer forming step). The obtained laminated film is processed into a molded product (metallic product) by molding.

[0058] Adhesion layer formation process

[0059] First, an adhesion layer is formed on a prepared substrate. The method for forming the adhesion layer is not particularly limited. For example, the adhesion layer can be formed by applying a resin solution constituting the adhesion layer dissolved in an appropriate solvent to the substrate using a roll coater or the like.

[0060] ·Evaporation process

[0061] Next, a metal vapor deposition layer is formed on the adhesion layer (evaporation process). There is no particular limitation on the method for forming the metal vapor deposition layer. For example, the vapor deposition method can appropriately adopt the existing known physical vapor deposition method or chemical vapor deposition method such as vacuum vapor deposition method, sputtering method, ion plating method, etc. Among them, it is preferred to set the metal vapor deposition layer by vacuum vapor deposition method for the reason of higher productivity. The vapor deposition conditions can appropriately adopt the existing known conditions according to the desired thickness of the metal vapor deposition layer. It should be noted that the metal material preferably has fewer impurities and a purity greater than or equal to 99% by weight, more preferably greater than or equal to 99.5% by weight. In addition, the metal material is preferably granular, rod-shaped, sheet-shaped, linear or processed into the shape of the crucible used. The heating method for evaporating the metal material can use a known method, such as using a method of placing the metal material in a crucible and performing resistance heating or high-frequency heating, a method of performing electron beam heating, a method of placing the metal material on a plate made of ceramics such as boron nitride and directly performing resistance heating, etc. The crucible used for vacuum evaporation is preferably made of carbon, but may also be made of alumina, magnesia, titania, or beryllium oxide.

[0062] Adhesive layer forming process

[0063] Next, an adhesive layer is formed on the metal vapor-deposited layer (adhesive layer forming step). The adhesive layer is provided in order to apply the laminated film of the present embodiment to an adherend to produce a molded product (metallic product).

[0064] There is no particular limitation on the method for forming the adhesive layer. As described above, the adhesive layer can be formed by applying a resin solution constituting the adhesive layer to the separator and laminating the separator having the adhesive layer formed thereon to the metal vapor-deposited layer, or the adhesive layer can be formed on the metal vapor-deposited layer. In addition, the adhesive layer can also be a ready-made product in which the adhesive layer is already provided on the separator.

[0065] The laminated film provided with an adhesive layer may also be provided with a lining. When a film insert process is used to manufacture a metallic texture product, a lining is preferably provided. There is no particular limitation on the lining. For example, the lining can be any polymer sheet that can be thermoformed, preferably an ABS sheet, a polyacrylic sheet, a polypropylene sheet, a polyethylene sheet, a polycarbonate sheet, an A-PET sheet, a PET-G sheet, a vinyl chloride sheet, a polyamide sheet, and the like.

[0066] The thickness of the lining sheet is not particularly limited. For example, from the viewpoint of molding performance such as compression molding, the thickness of the lining sheet is preferably 0.05 to 5 mm, and more preferably 0.3 to 3 mm.

[0067] The lining sheet may be a lining sheet with a desired surface treatment. The surface treatment is not particularly limited. For example, the surface treatment may be matte treatment, satin treatment, embossing treatment, hairline treatment, or various pattern texture treatments.

[0068] The obtained laminated film is provided with a separator. As described above, the laminated film may use a separator provided with an adhesive layer in advance, or may form an adhesive layer on the separator and bond the adhesive layer to the metal vapor-deposited layer in such a manner that the adhesive layer is in contact with the metal vapor-deposited layer.

[0069] The separator is not particularly limited and is, for example, polyethylene terephthalate (PET), polyethylene, polypropylene, or a plastic film or paper coated with a release agent such as a fluorine-based release agent or a long-chain alkyl acrylate-based release agent.

[0070] When the separator is peeled off, the adhesive layer is exposed and is attached to the adherend before molding.

[0071] Then, the adherend to which the laminated film of the present embodiment is attached is appropriately processed into a three-dimensional shape to manufacture a molded product (metallic texture product). There is no particular limitation on the molding method of the metallic texture product. For example, the molding method is to form by vacuum molding, TOM (Three dimension Overlay Method, three-dimensional surface decoration) molding, etc. In TOM molding, the laminated film is attached to a pre-prepared adherend and softened by heat, thereby adhering to the adherend and forming it as a whole. On the other hand, in vacuum molding, the laminated film is heated and softened by a heater. Then, the heated laminated film is vacuum-sucked and pressed against a mold having a desired three-dimensional shape, thereby deforming in a manner that fits the shape of the three-dimensional molded product.

[0072] The obtained metallic product has a metallic appearance during the day due to the effect of the metal vapor deposition layer containing indium. On the other hand, at night, light can be transmitted to the outside by irradiating light from the back with a light source.

[0073] An embodiment of the present invention has been described above. The present invention is not particularly limited to the above embodiment. It should be noted that the above embodiment is mainly described based on the invention having the following structure.

[0074] (1) A laminate film comprising: a substrate, an adhesion promoting layer, a metal vapor-deposited layer and an adhesive layer, wherein the metal vapor-deposited layer contains indium and has an OD value of 1.2 or less, and the OD value and the a* value and b* value of transmitted light in the L*a*b* color space satisfy the following formula (1);

[0075] OD value × (a * 2 +b* 2 ) 1 / 2≤6.7 (1).

[0076] According to such a structure, the laminated film has excellent molding processing performance and can be easily processed into various three-dimensional shapes. In addition, the OD value of the laminated film is included in the specified numerical range and satisfies the above formula (1), as a result, it can present a metallic appearance during the day and can well transmit light from the light source at night. As a result, the laminated film can be very suitable for use in metallic products such as metallic signs with various three-dimensional shapes.

[0077] (2) The laminated film according to (1), wherein the OD value and the a* value and b* value of the transmitted light in the L*a*b* color space satisfy the following formula (2);

[0078] OD value × (a * 2 +b* 2 ) 1 / 2 ≤6.0 (2).

[0079] With such a structure, the OD value of the laminated film is within a predetermined numerical range and satisfies the above formula (2), so that a metallic appearance can be easily presented during the day and light from a light source can be well transmitted at night.

[0080] (3) The laminated film according to (1) or (2), wherein the adhesive layer contains a colorant.

[0081] When a laminated film having a metal vapor-deposited layer composed of indium is allowed to transmit light from a light source through the back side, the transmitted light becomes brownish brown and the color is easily deteriorated. According to such a structure, the color tone of the transmitted light from the light source can be adjusted by the colorant.

[0082] (4) The laminated film according to (3), wherein the colorant contains at least one of a blue pigment and a magenta pigment.

[0083] According to such a configuration, the colorant can be used to adjust the color tone of the transmitted light from the light source to a blue color tone.

[0084] (5) The laminated film according to any one of (1) to (4), wherein a brightness L* value of reflected light in an L*a*b* color space is 60 or more.

[0085] According to such a structure, not only is the light transmittance excellent, but also the reflected brightness (reflectivity) is improved. As a result, the laminated film is more likely to present a metallic appearance in the daytime.

[0086] (6) The laminated film according to any one of (1) to (5), wherein the adhesive layer has a thickness of 10 to 60 μm.

[0087] According to such a structure, the laminated film has more excellent appearance and bonding performance during bonding.

[0088] (7) A metallic product using the laminated film according to any one of (1) to (6).

[0089] According to such a structure, the metal product can be easily manufactured by molding, and can obtain a metallic appearance during the day and can well transmit light from a light source at night. As a result, the metal product can be very suitable for applications such as metal signs with various three-dimensional shapes.

[0090] (8) A metallic signboard using the laminated film according to any one of (1) to (6).

[0091] According to such a structure, the metallic signboard can be easily manufactured by molding, and can obtain a metallic appearance during the day and can well transmit light from a light source at night.

[0092] [Example]

[0093] The present invention is described in more detail below by way of examples. The present invention is not limited to these examples. It should be noted that, unless otherwise specified, "%" means "mass %" and "parts" means "parts by mass".

[0094] <Example 1>

[0095] A substrate (thickness 75 μm) composed of PMMA is prepared. A gravure coater is used to apply a thickening coating solution mixed with acrylic polyol and isocyanate coating materials to the substrate in a manner of 1.3 μm after drying, and then it is dried at 100 ° C for 1 minute to form a thickening layer. Then, for the thickening layer, a metal vapor deposition layer is formed by vacuum evaporation so that the thickness of the metal vapor deposition layer composed of indium is 20 nm. In addition, a diaphragm (PET film) is prepared separately, which has an adhesive layer (thickness 25 μm), and the adhesive layer contains a blue pigment (CI pigment blue 15:3) of 2% by mass relative to the acrylic adhesive as a colorant. The metal vapor deposition layer is bonded in a manner that the adhesive layer (adhesive layer) is in contact with the adhesive layer (adhesive layer), and after the adhesive layer (adhesive layer) is transferred to the metal vapor deposition layer, the diaphragm is peeled off, thereby manufacturing the laminated film of Example 1.

[0096] <Examples 2 to 10, Comparative Examples 1 to 32>

[0097] A laminated film was produced in the same manner as in Example 1 except that the type of the deposited metal of the metal deposited layer, the OD value, etc. were adjusted according to the formulation shown in Table 1. When a magenta pigment was used, a magenta pigment (CI Pigment Red 122) was used.

[0098] [Table 1]

[0099] Table 1

[0100]

[0101] For the laminated films obtained in Examples 1 to 10 and Comparative Examples 1 to 32, the total light transmittance (TT), OD value, values of transmitted light and reflected light in the L*a*b* color space (L* value, a* value, b* value of transmitted light, L* value of reflected light), appearance evaluation (hue, translucency), and molding properties were evaluated according to the following methods. The results are shown in Table 1.

[0102] <Total light transmittance (TT)>

[0103] Regarding the total light transmittance, it was measured based on the standard of JIS K 7361 by using a haze meter (NDH2000, manufactured by Nippon Denshoku Industries Co., Ltd.) for each laminated film.

[0104] <OD value>

[0105] Regarding the OD value, it was measured by using a transmission densitometer (DM-500, manufactured by Dainippon Screen Mfg. Co., Ltd.) for each laminated film.

[0106] <Transmitted light and reflected light in the L*a*b* color space>

[0107] Regarding the transmitted light and reflected light in the L*a*b* color space, for each laminated film, a UV-visible near-infrared spectrophotometer (UV-3600, manufactured by Shimadzu Corporation) was used, and based on the standards of JIS K 8722 and CIE1976, the measurement was carried out under the conditions that the light source was a halogen lamp, the reflected light was received by an integrating sphere including regular reflection (geometric condition d(8°:di)), and the transmitted light was received by an integrating sphere including regular transmission (geometric condition f(0°:di)).

[0108] <Appearance evaluation (hue, translucency)>

[0109] Each laminated film was attached to an adherend (acrylic plate (semi-transparent milky white) manufactured by Mitsubishi Chemical Corporation, ACRYLITE EX432, thickness 3 mm). A rectangular frame made of an opaque black plate with an upper opening was prepared, and an LED light source was placed inside. The opening of the frame was closed with the adherend attached with the laminated film. The LED light source ((manufactured by JW-System Co., Ltd., MJ60LED module (6000K)) was lit, and the light was transmitted from the back. The hue and translucency were visually confirmed and evaluated based on the following evaluation criteria.

[0110] (Evaluation criteria (color tone))

[0111] ○: The color is not noticeable.

[0112] △: Slightly colored but within the allowable range.

[0113] ×: The color is obvious.

[0114] (Evaluation criteria (light transmittance))

[0115] ○: Sufficient brightness.

[0116] ×: Brightness is insufficient.

[0117] <Molding performance>

[0118] Each laminated film was attached to a transparent ABS sheet (thickness 300 μm) as an adherend. After heating to a sheet temperature of 140° C. using a tabletop vacuum tester (V.former, manufactured by Rayama Pack Co., Ltd.), the sheet was molded at a stretching ratio of 120%. The processing performance during molding was evaluated according to the following evaluation criteria.

[0119] (Evaluation Criteria)

[0120] ○: The metallic luster can be sufficiently maintained.

[0121] △: The metallic luster is slightly reduced.

[0122] ×: The metallic luster is significantly reduced.

[0123] As shown in Table 1, the laminated films of Examples 1 to 10 all have a metallic appearance and are excellent in light transmittance and formability.

Claims

1. A laminated film comprising: Substrate, adhesion layer, metal deposition layer and adhesive layer, The metal vapor deposition layer contains indium, The thickness of the metal vapor deposition layer is not less than 10 nm and not more than 30 nm. The adhesive layer contains a colorant, The colorant contains a blue pigment and a magenta pigment, The content of the blue pigment and the magenta pigment in the resin solution constituting the bonding layer is greater than 0 mass % and less than or equal to 8 mass %, The metal vapor-deposited layer is in contact with the adhesive layer, The thickness of the adhesive layer is 10 to 60 μm. OD value is less than or equal to 1.2, The OD value and the a* and b* values ​​of the transmitted light in the L*a*b* color space satisfy the following formula (1): OD value × (a * 2 + b * 2 ) 1 / 2 ≤ 6.7 (1).

2. The laminated film according to claim 1, wherein The OD value and the a* and b* values ​​of the transmitted light in the L*a*b* color space satisfy the following formula (2): OD value × (a * 2 + b * 2 ) 1 / 2 ≤ 6.0 (2).

3. The laminated film according to claim 1 or 2, wherein: The brightness L* value of the reflected light in the L*a*b* color space is 60 or greater. 4 . A metallic product using the laminated film according to claim 1 .

5. A metallic signboard using the laminated film according to any one of claims 1 to 3.

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