JP5949128B2 - Decorative film structure and decorative molded member - Google Patents

Description

  The present invention belongs to the technical field of decorative film structures and decorative molded members that can be used for automobile interior parts and the like.

  For example, there is a case where a metal design for producing a high-class feeling is required for automobile interior parts such as a door handle. For this reason, chrome plating having excellent luster, silver-satin-like satin plating, and the like are known. However, chrome plating has too high specularity and may not match the atmosphere in the automobile interior. On the other hand, satin plating has a calm texture, but the process is complicated.

  Accordingly, there is a need for a technique that easily realizes a polished metal surface design that is not too strong and shines dull. As one measure for that purpose, a decorative film structure is proposed in which the optical characteristics are close to those of a metal polished surface and the appearance exhibits a metal polished surface design. Such a decorative film structure can be easily obtained by, for example, printing or painting each layer on the base material of the transfer film. Alternatively, it can be easily obtained by printing or painting each layer on the clear film which is the surface layer of the decorative film structure. And a base material can be easily decorated to a metal grinding | polishing surface tone by transcribe | transferring or adhere | attaching the obtained decorating film structure to a base-material surface. Alternatively, each layer of the decorative film structure may be printed or painted directly on the substrate surface.

  Patent Document 1 discloses that an optical thin film layer including a light absorption layer composed of a high refractive index thin film layer, a low refractive index thin film layer, and / or a pure metal thin film layer is provided on a base material, whereby reflected brightness and reflected chroma are obtained. It is disclosed to obtain an optical thin film laminate including a light absorbing layer having a sufficiently large metallic luster. However, this technique is a technique for adding a metallic luster having a high reflection brightness to a substrate, and does not add a polished metal surface design with a suppressed gloss to the substrate.

JP 2009-83183 A (summary, FIGS. 1 to 5)

  An object of the present invention is to provide a decorative film structure and a decorative molded member whose appearance is a polished metal surface design, and easily realize a polished metal surface design that is not too glossy and shines dull. It is to be.

The decorative film structure according to one aspect of the present invention for solving the above problems is a surface layer composed of a transparent or translucent resin layer, a metallic luster layer formed on the back side of the surface layer, CIE 1976 brightness (L ^* ) defined by JIS-Z-8729 is composed of a plurality of fine dots formed on the surface side of the metallic luster layer or on the surface side of the surface layer. The fine dots are formed from a plurality of layers at least partially overlapping each other, and each layer forming the fine dots has a lower layer area adjacent to the upper layer area. And the lower layer is formed to be located inside the outer peripheral edge of the upper layer, and the surface layer is formed by the surface roughness of the surface layer of the surface layer and the peripheral edge of the dots of the light absorption layer. Light incident from the side A part of the light incident from the surface layer side is absorbed by the light absorption layer dod on the back side of the surface layer or on the surface side of the surface layer, and a metallic luster on the back side of the surface layer is diffused and reflected. decorative film structure characterized Rukoto is forwardly reflecting part of light incident from the surface layer side by a layer.

  According to this configuration, a part of the light incident on the decorative film structure from the surface layer side is diffusely reflected by the surface roughness on the surface side of the surface layer, and the light is incident on the back surface side of the surface layer or the surface side of the surface layer. Part of the light absorption layer is absorbed by the dod, and part of the light absorption layer is specularly reflected (specularly reflected) by the metallic luster layer on the back surface side. Also, part of the light is diffusely reflected by the peripheral edge of the dots of the light absorption layer. A combination of such diffuse reflection, absorption, and regular reflection of light realizes a polished metal surface design that is not too glossy and shines dull, with optical properties close to the polished metal surface, and the appearance is polished metal surface. A decorative film structure exhibiting a design is obtained. In particular, each fine dot of the light-absorbing layer is formed of a plurality of layers at least partially overlapping, so that diffuse reflection occurs at the peripheral edge of each layer. Therefore, it is possible to increase the ratio of diffuse reflection without reducing the ratio of the polished metal surface, that is, without reducing the specular reflection (specular reflection) brightness. Sufficient diffuse reflection that achieves a texture is achieved.

In the decorative film structure, the light absorption layer has a CIE 1976 color coordinate (a ^* , b ^* ) defined by JIS-Z-8729 of 0 <(a ^* ) ² + (b ^* ) ² <6400. It is preferable that the following relational expression is satisfied.

According to this configuration, the CIE 1976 color coordinates (a ^* , b ^* ) of the light absorption layer satisfy the relational expression of 0 <(a ^* ) ² + (b ^* ) ² <6400. A significant color difference due to the angle is suppressed, and sufficient light absorption is achieved to realize a dull and lustrous metal polished surface design having a unique color tone on the polished metal surface.

In addition, the CIE1976 lightness (L ^* ) and CIE1976 color coordinates (a ^* , b ^* ) of the light absorbing layer defined by the above JIS-Z-8729 are defined in JIS-Z-8722 according to JIS-Z-8729. Measured under the geometric condition a (illumination optical axis angle with respect to the normal direction of the sample surface: −45 ± 2 °, received light reflection optical axis angle: 0 ± 2 °).

  According to this configuration, while ensuring the light absorption function of the light absorption layer, diffuse reflection for realizing a polished metal polished surface design that achieves a dull shine is satisfactorily achieved.

In the decorative film structure, the surface roughness of the surface layer on the surface side is Ra ² μm or less, Rmax 4 μm or less, or Sm 50 μm or more, and the area of the fine dots in plan view is 10 ⁻³ to 10 ⁵ μm ^2. The area ratio of the fine dots per unit area in plan view is 1 to 80%, and the stimulation value in the XYZ color system defined by JIS-Z-8701 of the metallic luster layer (Y45 °) Is preferably 10,000 or more.

  Here, the stimulus value (Y45 °) of the metallic luster layer in the XYZ color system defined by JIS-Z-8701 is that the illumination optical axis angle with respect to the normal direction of the sample surface is −45 ± 2 °, and the light receiving reflection The Y value is calculated according to the definition of the tristimulus value of the object color by reflection in the XYZ color system defined by JIS-Z-8701, with the optical axis angle being 45 ± 2 °.

Thus, by setting Ra (arithmetic mean roughness) to 2 μm or less as the surface roughness on the surface side of the surface layer, sufficient diffuse reflection for realizing the metal polished surface design can be reliably obtained. Even when Rmax (maximum height) is set to 4 μm or less or Sm (average unevenness interval) is set to 50 μm or more, sufficient diffuse reflection for realizing a metal polished surface design can be reliably obtained. Moreover, by setting the area of the dot in plan view to 10 ⁻³ μm ² or more, the dot does not become too small, and light absorption by the light absorption layer is reliably performed. Further, by setting the dot area in plan view to 10 ⁵ μm ² or less, the dot area ratio is increased when the area ratio of dots per unit area in plan view is constant. , The diffuse reflection by the peripheral edge of the dot is reliably performed, and further, the dot does not become too large, and the deterioration of the appearance of the decorative film structure is suppressed. In addition, by setting the area ratio of dots per unit area in plan view to 1% or more, sufficient light absorption is reliably achieved to achieve a polished metal surface design that is not too glossy and dull. Is done. Further, by setting the area ratio of dots per unit area in plan view to 80% or less, the light absorption does not become excessive, and the excessive brightness and / or stimulation value of the decorative film structure is suppressed. The Further, by setting the stimulation value (Y45 °) of the metallic gloss layer to 10000 or more, sufficient regular reflection or metallic gloss for realizing a polished metal surface design can be obtained more reliably.

  In each of the above decorative film structures, the surface roughness of the surface layer is more preferably Ra 1 μm or less, Rmax 2 μm or less, or Sm 100 μm or more.

  According to this configuration, more sufficient diffuse reflection can be obtained more reliably to realize a polished metal surface design.

  In the above-described decorative film structure, the stimulation value (Y45 °) in the XYZ color system defined by JIS-Z-8701 of the metallic gloss layer is preferably 20000 or more.

  According to this configuration, sufficient regular reflection or metallic luster to realize a polished metal surface design can be obtained more reliably.

In each of the above decorative film structures, it is more preferable that the CIE1976 lightness (L ^* ) defined by JIS-Z-8729 of the light absorption layer is 0-50.

  According to this configuration, light absorption for realizing a polished metal surface design having a texture that is not too strong and shines dull is achieved more reliably.

  In said decorative film structure, it is preferable that the area ratio of the dot of a light absorption layer is 1 to 60%.

  According to this structure, light absorption does not become excessive too much and the fall of the excessive brightness and / or irritation | stimulation value of a decorative film structure is suppressed further.

  On the other hand, the decorative molded member according to one aspect of the present invention is such that the decorative film structure as described above is formed on the surface side of the substrate.

  According to this configuration, it is possible to obtain a decorative molded member whose optical characteristics are close to a metal polished surface and whose appearance exhibits a metal polished surface design.

  In the decorative molded member, the base material is preferably a resin molded member.

  According to this configuration, it is possible to increase the degree of freedom of the shape of the decorative molded member whose optical characteristics are close to those of a metal polished surface and whose appearance exhibits a metal polished surface design.

  As described above, according to the present invention, since a decorative film structure and a decorative molded member having an appearance that exhibits a polished metal surface design are provided, the polished metal surface is not too strong and shines dull. The design can be easily realized.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the layer structure of the decorative film structure which concerns on one Embodiment of this invention, and a decorative molding member, Comprising: (A) is what the light absorption layer was formed in the back surface side of the surface layer, ( In B), the light absorption layer is formed on the surface side of the surface layer. It is a longitudinal cross-sectional view which shows the other example (modified example of FIG. 1 (A)) of the layer structure of a decoration film structure and a decoration shaping | molding member.

  The inventors of the present invention have repeatedly studied with the goal of realizing a polished metal surface design with a glossy texture that is not too strong and that shines with a decorative film structure having a structure in which a plurality of layers are laminated. As a result, attention was paid to the fact that diffuse reflection, light absorption, and regular reflection (specular reflection) of light incident on the decorative film structure are important elements for realizing a polished metal surface design. The diffuse reflection can be reproduced by the surface roughness of the surface layer of the decorative film structure, the light absorption can be reproduced by the light absorption layer having a relatively low brightness, and the regular reflection has a relatively high stimulation value. It is found that reproduction is possible with a high metallic luster layer, and after forming each layer in an appropriate arrangement, the amount of light incident on the light absorption layer and metallic luster layer is balanced by their area etc. It was found that it is possible to obtain the appearance of a polished metal surface design in which diffuse reflection, light absorption and regular reflection of each other are combined.

  However, it is not easy to realize a highly polished metal surface design that has a unique texture that shines dull depending on the surface roughness of the polished metal surface. If it is simply provided, the specular reflection (specular reflection) luminance is lost, and the whole becomes like a painted surface.

  Therefore, the present inventor has repeatedly performed various tests based on such knowledge and ingenuity, so that the metal polished surface condition has a unique texture that is not too strong and shines dull depending on the surface roughness of the metal polished surface. The decorative film structure 10 which can provide a design was completed.

That is, the decorative film structure 10 according to the present embodiment includes a plurality of surface layers 1 formed of a transparent or translucent resin layer and a back surface side of the surface layer 1 as shown in FIG. And a metallic luster layer 3 formed on the back side of the surface layer 1 so as to fill the space between the dots of the light absorption layer 2. The light absorption layer 2 has a CIE1976 lightness (L ^* ) defined by JIS-Z-8729 of 0 to 80, and the fine dots constituting the light absorption layer 2 have a two-layer structure ( 2a and 2b). Specifically, the lower layer 2b is formed such that the area of the lower layer 2b is smaller than the area of the upper layer 2a adjacent thereto, and the lower layer 2b is located inside the outer peripheral edge of the upper layer 2a.

  Here, the surface layer 1 has a diffuse reflection function, the light absorption layer 2 has an absorption function and a diffuse reflection function, and the metallic luster layer 3 has a regular reflection function.

  In the decorative film structure 10, the metallic gloss layer 3 is observed from the gap between the dots by disposing a part of the metallic gloss layer 3 in the gap between the dots of the light absorption layer 2. Therefore, when the decorative film structure 10 is viewed from the surface layer 1 side having the diffuse reflection function, the light absorption layer 2 having the light absorption function is finely scattered in the metallic luster layer 3 having the regular reflection function. doing.

  According to such a configuration, a part of the light incident on the decorative film structure 10 from the surface layer 1 side is diffusely reflected by the surface roughness on the surface side of the surface layer 1. A part of the light is absorbed by the dots of the light absorption layer 2, and a part thereof is diffusely reflected by the peripheral part of the dot, more specifically, the peripheral part of each layer 2 a, 2 b forming the dot, and the metallic luster on the back side of the surface layer 1 Part of the layer 3 is specularly reflected (specularly reflected). This kind of diffuse reflection, light absorption, and regular reflection of light is not too strong, and a unique polished metal surface design that shines dull depending on the surface roughness of the polished metal surface has been realized. A decorative film structure 10 is obtained that is close to the metal polishing surface and has an appearance that exhibits a metal polishing surface design.

  FIG. 1A shows a configuration in which the metallic gloss layer 3 is also present on the back side of the dots of the light absorption layer 2 and a part of the metal gloss layer 3 is disposed in the gap between the dots of the light absorption layer 2. However, the present invention is not limited to this, and the metallic gloss layer 3 does not exist on the back side of the dots of the light absorption layer 2, and the entire metal gloss layer 3 is arranged in the gap between the dots of the light absorption layer 2. It may be configured.

As shown in FIG. 1B, another decorative film structure 10 according to this embodiment is formed on the surface layer 1 made of a transparent or translucent resin layer and on the surface side of the surface layer 1. In addition, a light absorption layer 2 composed of a plurality of fine dots and a metallic gloss layer 3 formed on the back side of the surface layer 1 are provided. The light absorption layer 2 has a CIE1976 lightness (L ^* ) defined by JIS-Z-8729 of 0 to 80, and the fine dots constituting the light absorption layer 2 have a two-layer structure ( 2a and 2b). Here, the surface layer 1 has a diffuse reflection function, the light absorption layer 2 has an absorption function and a diffuse reflection function, and the metallic luster layer 3 has a regular reflection function.

  In the decorative film structure 10, the metallic gloss layer 3 is observed from the gap between the dots by disposing the metallic gloss layer 3 under the light absorption layer 2. Therefore, when the decorative film structure 10 is viewed from the surface layer 1 side having the diffuse reflection function, the light absorption layer 2 having the light absorption function is finely scattered in the metallic luster layer 3 having the regular reflection function. doing.

  According to such a configuration, a part of the light incident on the decorative film structure 10 from the surface layer 1 side is diffusely reflected by the surface roughness of the surface layer 1, and the light on the surface side of the surface layer 1 is reflected. Part of the light absorbing layer 2 is absorbed by the dots, and part of the dots are diffusely reflected by the peripheral part of the dots, specifically the peripheral parts of the respective layers 2a and 2b forming the dots. 3 is specularly reflected (specular reflection). This kind of diffuse reflection, light absorption, and regular reflection of light is not too strong, and a unique polished metal surface design that shines dull depending on the surface roughness of the polished metal surface has been realized. A decorative film structure 10 is obtained that is close to the metal polishing surface and has an appearance that exhibits a metal polishing surface design.

  In the present embodiment, the diffuse reflection function refers to 20% of the reflected light intensity when reflecting visible light (wavelength: 420 to 670 nm, spread angle: substantially zero degree) incident from the outside at an incident angle of 45 degrees. This refers to the function of reflecting in a direction other than the direction within the regular reflection angle of ± 3 degrees. Alternatively, when visible light (wavelength: 380 to 780 nm, spread angle: substantially zero degree) incident from the outside at an incident angle of 90 degrees is transmitted, a direction within 5% of the transmitted light intensity is within a normal transmission direction angle of ± 3 degrees A function that changes the angle in a direction other than. The light absorption function refers to a function of absorbing or transmitting 20% or more of the intensity of visible light (wavelength: 420 to 670 nm, spread angle: substantially zero degree) incident from the outside at an incident angle of 90 degrees. Preferably, when the incident visible light is reflected, the difference in reflectance for each wavelength (420 to 670 nm) is within ± 10%. The regular reflection function means that when visible light (wavelength: 420 to 670 nm, spread angle: substantially zero degree) incident from the outside at an incident angle of 45 degrees is reflected, 90% or more of the reflected light intensity is a regular reflection angle ± The function of reflecting in a direction within 3 degrees.

In the present embodiment, the surface roughness (Ra, Rmax, Sm) on the surface side of the surface layer 1, the lightness (L ^* ) of the light absorption layer 2, the area of the dots of the light absorption layer 2, the dots of the light absorption layer 2 By adjusting the area ratio and the stimulation value (Y45 °) of the metallic gloss layer 3, the degree of diffuse reflection of light, the degree of specular reflection of light, and the absorption of light in the metal polished surface design of the decorative film structure 10 Can be independently adjusted to a desired value.

  In the present embodiment, the surface roughness of the surface side of the surface layer 1 is Ra 2 μm or less, Rmax 4 μm or less, or Sm 50 μm or more. By setting Ra (arithmetic mean roughness) to 2 μm or less, sufficient diffuse reflection can be reliably obtained to realize a polished metal surface design. Even when Rmax (maximum height) is set to 4 μm or less or Sm (average unevenness interval) is set to 50 μm or more, sufficient diffuse reflection can be surely obtained in order to realize a metal polished surface design.

  The surface roughness on the surface side of the surface layer 1 is more preferably Ra 1 μm or less, Rmax 2 μm or less, or Sm 100 μm or more. Thereby, sufficient diffuse reflection for realizing a polished metal surface design can be obtained more reliably.

In the present embodiment, the CIE 1976 brightness (L ^* ) defined by JIS-Z-8729 of the light absorption layer 2 is 0 to 80 as described above. By setting the lightness (L ^* ) of the light absorption layer 2 to 80 or less, sufficient light absorption is achieved to realize a polished metal surface design that is not too strong and shines dull.

The lightness (L ^* ) of the light absorption layer 2 is more preferably 0-50. Thus, light absorption is more reliably achieved to realize a metal polished surface design having a texture that is not too strong and shines dull.

  As described above, each fine dot forming the light absorption layer 2 has the area of the lower layer 2b smaller than the area of the upper layer 2a adjacent thereto, and the lower layer 2b is smaller than the outer periphery of the upper layer 2a. It has a two-layer structure (2a, 2b) formed so as to be located inside. Thereby, while the light absorption function of the light absorption layer 2 is satisfactorily exhibited, sufficient diffuse reflection is achieved so as to produce a unique texture that shines dull due to the surface roughness of the polished metal surface. In other words, it is effective to increase the ratio of diffuse reflection of light incident on the decorative film structure in order to realize a unique texture that shines dull depending on the surface roughness of the metal polished surface. At this time, for example, it is conceivable to provide minute unevenness on the surface of the metallic luster layer. In this case, the surface of the metallic luster layer is rough and the regular reflection (specular reflection) luminance of the metallic luster layer is lost. On the contrary, the whole looks like a painted surface. On the other hand, according to the configuration of the decorative film structure 10 in which each fine dot constituting the light absorption layer 2 has a two-layer structure (2a, 2b), regular reflection (specular reflection) of the metallic gloss layer 3 is achieved. It is possible to increase the ratio of diffuse reflection without reducing the luminance, and as a result, sufficient diffuse reflection is achieved so as to produce a unique texture that shines dull depending on the surface roughness of the polished metal surface.

Further, the CIE 1976 color coordinates (a ^* , b ^* ) of the light absorption layer 2 satisfy the relational expression of 0 <(a ^* ) ² + (b ^* ) ² <6400. When the color coordinates (a ^* , b ^* ) satisfy such a relational expression, a dull shining textured metal-polished surface design that is less affected by the viewing angle and has a unique color tone to the metal-polished surface is realized. Sufficient absorption is achieved. That is, in the above-described decorative film structure 10 composed of a plurality of layers, the color tone is the light receiving angle (the angle at which the decorative film structure 10 is viewed; the normal direction of the decorative film structure 10 and the light receiving reflection optical axis). Is small, the color tone of the light absorption layer 2 tends to be reflected, and the light reception angle tends to be easily affected by light interference due to the difference in the reflection surface. This is one of the causes of the difference in color tone of the decorative film structure 10 depending on the viewing angle (light receiving angle). The color coordinates (a *, b *) of the light absorption layer 2 satisfy the above relational expression. As a result, it is possible to suppress a significant change in color tone due to a difference in the light receiving angle, and to achieve a light absorption sufficient to realize a dull shining textured metal polished surface design having a unique color tone on the polished metal surface. .

In the present embodiment, the area of the dots in plan view is 10 ⁻³ to 10 ⁵ μm ² . By setting the area of the dots to 10 ⁻³ μm ² or more, the dots do not become too small, and light absorption by the dots is reliably performed. By setting the dot area to 10 ⁵ μm ² or less, when the area ratio of dots per unit area in a plan view is constant, the number of dots increases. Diffuse reflection by the peripheral edge portion is reliably performed. Moreover, a dot does not become large too much and the fall of the appearance of the decoration film structure 10 is suppressed.

  In the present embodiment, the area ratio of dots per unit area in plan view is 1 to 80%. By setting the dot area ratio to 1% or more, sufficient light absorption can be reliably achieved to realize a metal polished surface design having a texture that is not too strong and shines dull. By setting the area ratio of the dots to 80% or less, the light absorption does not become excessive, and the excessive brightness and / or stimulation value of the decorative film structure 10 is suppressed.

  The area ratio of dots of the light absorption layer 2 is more preferably 1 to 60%. Thereby, light absorption does not become excessive too much and the fall of the excessive brightness and / or irritation | stimulation value of the decorative film structure 10 is suppressed further.

  In the present embodiment, the stimulation value (Y45 °) in the XYZ color system defined by JIS-Z-8701 of the metallic luster layer 3 is 10,000 or more. By setting the stimulation value (Y45 °) of the metallic luster layer 3 to 10,000 or more, sufficient regular reflection or metallic luster can be surely obtained to realize a polished metal surface design.

  The stimulation value (Y45 °) of the metallic luster layer 3 is more preferably 20000 or more. Thereby, sufficient regular reflection thru | or metallic luster in order to implement | achieve a metal grinding | polishing surface design can be obtained more reliably.

  In the embodiment, the thicknesses of the surface layer 1, the light absorption layer 2, and the metallic luster layer 3 are not particularly limited. Depending on the situation, the thickness may be in the range of 1 μm to 1 mm, for example.

  The surface layer 1 may be colorless or colored as long as it is transparent or translucent. By adjusting the color of the surface layer 1, the kind of metal (for example, aluminum etc.) in the metal polishing surface design of the decorative film structure 10 can be adjusted to a desired one.

  The material of the light absorption layer 2 is not particularly limited. Resins and metals are preferred, but depending on the situation, for example, paper, minerals, other fibrous materials, and other inorganic materials may be used.

  The material of the metallic luster layer 3 is not particularly limited. For example, resin and metal are preferable. By adjusting the color of the metallic luster layer 3, the type of metal (for example, aluminum) in the metal polished surface design of the decorative film structure 10 can be adjusted to a desired one.

  Moreover, the structure of each fine dot which comprises the light absorption layer 2 is not restricted to a two-layer structure as shown in FIG. 1, A structure of three or more layers may be sufficient. As shown in FIG. 1, the structure of each fine dot is such that the area of the lower layer 2b is smaller than the area of the upper layer 2a adjacent thereto, and the lower layer 2b is located inside the outer peripheral edge of the upper layer 2a. However, as shown in FIG. 2, as long as at least a part is overlapped, a structure in which adjacent layers are shifted may be used. In the case of the structure as shown in FIG. 2, light is diffusely reflected by the peripheral portions of the layers 2a and 2b forming the fine dots, so that the surface roughness of the metal polished surface is the same as in the structure shown in FIG. By this, diffuse reflection that produces a unique texture that shines dull is achieved.

  The decorative film structure 10 can be easily obtained, for example, by printing or painting the layers 1 to 3 on a base material (not shown) of a transfer film. Alternatively, it can be easily obtained by printing or painting the layers 2 and 3 on the clear film to be the surface layer 1 of the decorative film structure 10. In addition, each fine dot of the light absorption layer 2 can be made into a two-layer structure by, for example, applying dots repeatedly by screen printing or the like. And the base material 5 can be easily decorated to a metal grinding | polishing surface tone by transferring or adhere | attaching the obtained decorating film structure 10 to the surface of the base material 5. FIG. Alternatively, the layers 1 to 3 of the decorative film structure 10 may be printed or painted directly on the surface of the substrate 5.

  In this way, a decorative molded member 20 in which the decorative film structure 10 is formed on the surface side of the substrate 5 is obtained. The decorative molded member 20 has an optical characteristic close to a metal polished surface and an external appearance having a metal polished surface design. Therefore, it is suitable for automobile interior parts such as door handles, home appliance parts, personal computer parts, mobile phone parts, office parts, sports equipment parts, measuring equipment parts, miscellaneous goods parts, and the like.

  The substrate 5 is preferably a resin molded member. This is because the degree of freedom of the shape of the decorative molded member 20 whose optical characteristics are close to the metal polished surface and whose appearance exhibits the metal polished surface design can be increased.

  In FIG. 1, reference numeral 4 is an adhesive layer for adhering the backing layer and / or the decorative film structure 10 for pressing the metallic gloss layer 3 to the surface layer 1. Further, a protective layer (not shown) for preventing the metallic gloss layer 3 from being eroded or corroded by the backing layer (adhesive layer) 4 is provided between the metallic gloss layer 3 and the backing layer (adhesive layer) 4. May be.

  In addition, a transparent or translucent, colorless or colored protective layer is provided on the outer surface of the decorative film structure 10 or the outer surface of the decorative molded member 20 as long as the effects of the present invention are not impaired. May be. This protective layer is provided directly on the surface layer 1, for example. This protective layer is provided for protecting the surface of the decorative film structure 10 or the decorative molded member 20. The protective layer may be provided to adjust the surface roughness (Ra, Rmax, Sm) on the surface side of the surface layer 1. Therefore, the surface roughness (Ra, Rmax, Sm) on the surface side of the surface layer 1 referred to in the present invention includes the surface roughness (Ra, Rmax, Sm) adjusted by this protective layer.

  Hereinafter, the present invention will be described in more detail through examples (Tables 1 and 2), but the present invention is not limited to the following examples.

[Production of decorative film structure]
(Test Nos. 1 to 14 and 19 (Test No. 19 is a comparative example))
A decorative film structure 10 having the configuration shown in FIG. 1A was produced according to the specifications shown in Table 1. As the surface layer 1, a polycarbonate sheet “PC1151” (plate thickness: 0.5 mm) manufactured by Teijin Chemicals Ltd. was used, and a light absorption layer 2 (thickness: 3 μm) was formed on one side by screen printing. For the formation of the light absorption layer 2, UV ink “HUG” manufactured by Seiko Advance Co., Ltd. was used. Next, a metallic luster layer 3 (thickness 2 μm: as a thickness above the light absorption layer 2) was formed on the light absorption layer 2 by screen printing. For the formation of the metallic luster layer 3, ink “MIR-51000 Mirror Silver” manufactured by Teikoku Ink Manufacturing Co., Ltd. was used. Next, a backing layer 4 (thickness 10 μm) was formed on the metallic gloss layer 3 by screen printing. For forming the backing layer 4, ink “MIB-611 White” manufactured by Teikoku Ink Manufacturing Co., Ltd. was used. As described above, the decorative film structure 10 having an aluminum polished surface appearance when observed from the surface layer 1 side was obtained.

(Test numbers 17, 18 (comparative examples))
A decorative film structure was prepared in the same manner as in Test Nos. 1 to 14 and 19, except that the fine dots of the light absorption layer 2 had a single layer structure.

(Test numbers 15 and 16 (comparative examples))
A decorative film structure was prepared in the same manner as in test numbers 1 to 14 and 17 to 19 except that the light absorption layer 2 was not formed.

[Appearance evaluation of decorative film structure]
The appearance of the produced decorative film structure 10 was optically evaluated. That is, visible light (wavelength: 420 to 670 nm, spread angle: substantially zero degree) is irradiated from the surface layer 1 side to the decorative film structure 10 at an incident angle of 45 degrees, and the stimulation value Y of the regular reflection angle, that is, regular reflection ( Using a variable angle spectrophotometer made by Murakami Color Research Laboratory, the specular reflection (Y45 °) stimulus value Y with a regular reflection angle of −5 degrees, that is, the diffuse reflection stimulus value (Y40 °). It was measured. The results are shown in Tables 1 and 2.

  Here, the specular reflection stimulus value (Y45 °) is JIS-Z-8701 where the illumination optical axis angle with respect to the normal direction of the sample surface is −45 ± 2 ° and the light reception / reflection optical axis angle is 45 ± 2 °. The Y value is calculated in accordance with the definition of the tristimulus value of the object color due to reflection in the XYZ color system defined in (1). Further, the diffuse reflection stimulation value (Y40 °) is JIS-Z-8701 with the illumination optical axis angle with respect to the normal direction of the sample surface set to −45 ± 2 ° and the received light reflection optical axis angle set to 40 ± 2 °. The Y value is calculated according to the definition of the tristimulus value of the object color due to reflection in the prescribed XYZ color system.

  In addition, when the stimulation value of specular reflection (Y45 °) and the diffuse reflection stimulation value (Y40 °) of the real polished surface of aluminum and low-gloss satin plating were measured in the same manner, the specular reflection stimulus of the polished surface of aluminum was measured. The value (Y45 °) is in the range of 35000 to 55000 (eg, 38306), the diffuse reflection stimulus value (Y40 °) is in the range of 900 to 1300 (eg, 925), and the specular reflection stimulus value of satin plating (Y45 °) Was in the range of 10,000 to 75000 (for example, 31977), and the diffuse reflection stimulation value (Y40 °) was in the range of 900 to 2600 (for example, 1784).

  As is clear from Tables 1 and 2, the decorative film structures of Test Nos. 1 to 14 and 17 to 19 have regular reflection stimulation values as compared to Test Nos. 15 and 16 in which the light absorption layer 2 was not formed. (Y45 °), diffuse reflection stimulus value (Y40 °), and / or ratio of diffuse reflection stimulus value (Y40 °) to specular reflection stimulus value (Y45 °) (diffuse reflection stimulus value (Y40 °) / regular reflection) The stimulus value (Y45 °; hereinafter referred to as stimulus value ratio) was a value relatively close to that of a real aluminum polished surface or the like.

  Among the decorative film structures of Test Nos. 1 to 14 and 17 to 19 that form the light absorption layer 2, the fine dots that form the light absorption layer 2 are decorated with the test numbers 1 to 14 of the two-layer structure. Compared to the decorative film structure of test numbers 17 and 18 with a single-layer structure, the film structure is relatively close to a real aluminum polished surface, etc., and has regular reflection (specular reflection). It can be considered that the balance with the diffuse reflection is good for realizing a unique texture that shines dull due to the surface roughness of the polished metal surface. Even if the fine dots forming the light absorption layer 2 have a two-layer structure, the test value 19 having the same size (area) of the upper and lower layers has a lower stimulation value ratio than that of a real aluminum polishing surface. However, this is because the size of the upper layer and the lower layer of the fine dots is the same, so that the peripheral portions overlap, and the area ratio of the light absorption layer 2 itself is low, compared with those of test numbers 1-14. This is thought to be due to the fact that the diffuse reflection at the light absorption layer 2 is small.

  INDUSTRIAL APPLICABILITY The present invention has wide industrial applicability in the technical field of decorative film structures and decorative molded members that can be used for automobile interior parts and the like.

DESCRIPTION OF SYMBOLS 1 Surface layer 2 Light absorption layer 3 Metal luster layer 4 Backing layer (adhesion layer)
5 Base Material 10 Decorated Film Structure 20 Decorated Molding Member

Claims (9)

A surface layer composed of a transparent or translucent resin layer;
A metallic luster layer formed on the back side of the surface layer;
CIE 1976 brightness (L ^* ) defined by JIS-Z-8729 is composed of a plurality of fine dots formed on the surface side of the metallic luster layer or on the surface side of the surface layer. A light absorption layer,
The fine dots are formed from a plurality of layers at least partially overlapping ,
Each layer forming the fine dots is formed such that the area of the lower layer is smaller than the area of the upper layer adjacent thereto and the lower layer is located inside the outer peripheral edge of the upper layer,
A part of the light incident from the surface layer side is diffusely reflected by the surface roughness of the surface layer of the surface layer and the peripheral edge of the dot of the light absorption layer, and the light on the back side of the surface layer or the surface side of the surface layer and absorption of part of the light incident from the surface layer side by Dodd absorption layer, characterized Rukoto by the back surface side of the metallic luster layer of the surface layer is specularly reflected part of the light entering from the surface layer side A decorative film structure. In the light absorption layer, the CIE 1976 color coordinates (a ^* , b ^* ) defined by JIS-Z-8729 satisfy the relational expression of 0 <(a ^* ) ² + (b ^* ) ² <6400. The decorative film structure according to claim 1, wherein the decorative film structure is provided. The surface roughness of the surface side of the surface layer is Ra 2 μm or less, Rmax 4 μm or less, or Sm 50 μm or more,
The area of the fine dots in plan view is 10 ⁻³ to 10 ⁵ μm ² ,
The area ratio of the fine dots per unit area in plan view is 1 to 80%,
The decorative film structure according to claim 1 or 2 , wherein a stimulation value (Y45 °) in an XYZ color system defined by JIS-Z-8701 of the metallic gloss layer is 10,000 or more. The decorative film structure according to any one of claims 1 to 3, wherein the surface roughness of the surface layer of the surface layer is Ra 1 µm or less, Rmax 2 µm or less, or Sm 100 µm or more. The decorative film structure according to claim 3 or 4 , wherein a stimulation value (Y45 °) in an XYZ color system defined by JIS-Z-8701 of the metallic gloss layer is 20000 or more. The decorative film structure according to any one of claims 1 to 5 , wherein the light absorption layer has a CIE1976 lightness (L ^* ) defined by JIS-Z-8729 of 0 to 50. The decorative film structure according to any one of claims 1 to 6 , wherein an area ratio of dots of the light absorption layer is 1 to 60%. A decorative molded member, wherein the decorative film structure according to any one of claims 1 to 7 is formed on a surface side of a substrate. The decorative molded member according to claim 8 , wherein the base material is a resin molded member.

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