JP2005212339A - Iridescent transfer film and iridescent molded article obtained by using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an iridescent molded article, in which the adhesions between respective layers of an iris layer are favorable and the high temperature and highly humid durability are excellent and further the dispersion in iridescent tone between manufacturing lots is small, even under the condition that the colors of the light reflected by the iris layer and the colors of transmitted light passing through the iris layer and a transparent base material show respectively iridescent and the tone of the iridescence of the reflected light is different from that of the transmitted light and, in addition, the iridescence of the reflected light shows the iridescences at the front and the rear surfaces of an iridescent molded article having color tones different from each other and the iridescence of the reflected light shows a red based one. <P>SOLUTION: In the iridescent transfer film, in which a release layer, a protective layer, the iris layer and a bonding layer are formed in the order named on one side of a plastic film, the iris layer is prepared by forming a thin metallic film layer, a resin layer and a thin highly refractive film layer in the order named under the condition that its total light ray transmittance is set to be 30-60%. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a molded article exhibiting a so-called iris color whose color changes depending on a viewing angle, and an iris color transfer film used for obtaining the molded article, and more particularly, imparts an iris color to at least one surface of a transparent substrate. A molded product with an iris layer, and the color of reflected light reflected by the iris layer and the color of transmitted light that passes through the iris layer and the transparent substrate exhibit an iris color, respectively. The iris color of the light is an iris color with a different tone, the iris color of the reflected light is an iris color with a different tone on the front and back of the iris color molded product, the iris color of the reflected light is vivid and excellent in design, and The adhesion between the layers of the iris layer is good, there is no decrease in the adhesion or change in appearance even in high temperature and high humidity environments, and there is little variation in the color of the iris color between production lots. Windows, sunglasses, goggles, TV, etc. Particularly advantageous if used in a housing or the like of appliances, iris color molded article, and a rainbow-colored transfer film used to obtain it.

2. Description of the Related Art Conventionally, an iris color molded product used for audio product windows, sunglasses and the like, and an iris color transfer film used for obtaining the same are known.
In Patent Document 1, an iris color transfer in which a release layer, a protective layer, an iris layer in which a high refractive index thin film layer is formed on both sides of a low refractive index thin film layer, and an adhesive layer are sequentially formed on one side of a plastic film. In the film, an iris color transfer film in which a high refractive index thin film layer on at least one side is formed on a low refractive index thin film layer via a metal thin film layer and an iris color molded product obtained using the same are described. .
The specific configuration of the iris layer is as follows: ZnS thin film layer (high refractive index thin film layer), metal thin film layer, SiO ₂ thin film layer (low refractive index thin film layer), metal thin film layer, ZnS thin film layer (high refractive index thin film) Layer) or from the protective layer side, an SiO thin film layer (high refractive index thin film layer), an SiO ₂ thin film layer (low refractive index thin film layer), a metal thin film layer, and a ZnS thin film layer (high refractive index thin film layer) are formed in order. It is a thing.
There is also a description that the metal thin film layer is a Cr thin film layer.
JP 2003-326895 A

However, the iris color molded product obtained by using the conventional iris color transfer film has the following drawbacks.
1. The color of the reflected light reflected on the iris layer side and the color of the transmitted light that passes through the iris layer and the transparent base material exhibit an iris color, and the iris color of the reflected light and the transmitted light have different tones. However, the iris color of the reflected light was the same color tone on the front and back of the iris color molded product, and it was not possible to make the iris color with a different color tone on the front and back of the molded product.
In addition, there was no problem when the iris color of the reflected light was blue, but when the iris color of the reflected light was red (red, orange, pink, etc.) In
2. It is necessary to increase the thickness of each layer constituting the iris layer, which causes a problem in that the adhesion between the layers of the iris layer is reduced and cracks occur in the iris layer.
3. After conducting a high-temperature, high-humidity endurance test (a test that is allowed to stand for 24 hours in an atmosphere at a temperature of 65 ° C and a humidity of 95%), which is a necessary test for audio products, etc. In addition, there is a defect that the adhesion between the layers of the iris layer is lower than the adhesion before the test, and there are cases where appearance changes such as changes in the color tone of the iris color, occurrence of cracks, and occurrence of corrosion may occur.
4). There was a variation in iris color tone among production lots, and there was a problem that production stability was slightly lacking.
Here, the variation in the color tone of the iris color specifically means that, for example, the pink color of light (vertically reflected light) reflected almost perpendicularly to the surface of the iris color molded product is slightly yellowish. It is a variation that changes to pink or pink with a slight blue color, and this variation is usually not a problem, but it is a problem when used for applications that are severe in terms of variations in iris color. The thing which becomes.

  The present invention eliminates all of the above-mentioned drawbacks. The color of reflected light reflected by the iris layer and the color of transmitted light passing through the iris layer and the transparent substrate exhibit an iris color, respectively. The iris color of the transmitted light is different from the iris color of the transmitted light, and the iris color of the reflected light is an iris color with different colors on the front and back of the iris color molded product, and the reflected light iris color is vivid, making it an attractive design In addition to being extremely excellent, even when the iris color of the reflected light is a red-type iris color, the adhesion between the layers of the iris layer is good, and the adhesion after the high temperature and high humidity durability test Iris color molded product that has excellent durability at high temperature and high humidity without causing deterioration in appearance and appearance change, and with little variation in iris color tone between production lots, and iris color transfer film used therefor Is to provide.

[1] The present invention provides an iris color transfer film in which a release layer, a protective layer, an iris layer, and an adhesive layer are sequentially formed on one side of a plastic film. The iris layer has a total light transmittance of 30 to 60%. An iris color transfer film, in which a metal thin film layer, a resin layer, and a high refractive index thin film layer are sequentially formed.
[2] The present invention is the iris color transfer film according to the above [1], wherein a release anchor layer is formed between the plastic film and the release layer.
[3] The present invention provides an iris color molded product obtained by transferring the iris color transfer film according to the above [1] or [2] to a transparent substrate, the adhesive layer on at least one surface of the transparent substrate, A metal thin film layer having a total light transmittance of 30 to 60%, a resin layer, an iris layer in which a high refractive index thin film layer is sequentially formed, a protective layer, and a release layer are sequentially formed. It is an iris color molding.
[4] The iris transfer film according to [1] or [2], wherein the metal thin film layer is a Cr thin film layer and the high refractive index thin film layer is a ZnS thin film layer.
[5] The present invention is an iris color molded product obtained by transferring the iris color transfer film according to the above [4] to a transparent substrate, and has an adhesive layer and a total light transmittance on at least one side of the transparent substrate. An iris color molded product characterized in that an iris layer, a protective layer, and a release layer are sequentially formed of a Cr thin film layer, a resin layer, and a ZnS thin film layer of 30 to 60%.

The iris color transfer film of the present invention is an iris color transfer film in which a release layer, a protective layer, an iris layer, and an adhesive layer are sequentially formed on one side of a plastic film. The iris layer has a total light transmittance of 30 to 30. Since the metal thin film layer, the resin layer, and the high refractive index thin film layer which are 60% are sequentially formed, the iris color molded product obtained by transferring the transfer film is
(1) The color of the reflected light reflected on the iris layer side and the color of the transmitted light passing through the iris layer and the transparent base material each exhibit an iris color, and the iris color of the reflected light and the iris color of the transmitted light have different tones. Of course, the iris color of the reflected light is vivid, and the iris color of the reflected light becomes an iris color with a different tone on the front and back of the iris color molded product.
In addition, the iris color molded product obtained by transferring the iris color transfer film of the present invention is not limited to the case where the reflected iris color is a blue iris color. Even if it is colored,
(2) Even if the thickness of each layer constituting the iris layer is not increased, the iris color of the reflected light can be changed to a red iris color by mainly increasing the thickness of the resin layer. The adhesion between the layers of the iris layer is sufficiently strong, and there is no occurrence of cracks in the iris layer.
(3) After conducting a high-temperature, high-humidity endurance test (a test that is allowed to stand for 24 hours in an atmosphere at a temperature of 65 ° C. and a humidity of 95%) to evaluate the durability in a high-temperature and high-humidity environment, Adhesiveness does not deteriorate from that before the test, and appearance changes such as iris color change, cracking, and corrosion do not occur.
(4) Variation in iris color tone among production lots is reduced, and production stability is improved.
(5) The iris color molded product obtained by transferring the iris color transfer film of the present invention having a Cr thin film layer as a metal thin film layer and a ZnS thin film layer as a high refractive index reflective layer to a transparent substrate has a brighter iris color. In addition, as a result of better adhesion between the respective layers of the iris layer, the high temperature and high humidity durability is further improved.

The iris molded product of the present invention comprises, as necessary, a release anchor layer, a release layer, a protective layer, a metal thin film layer having a total light transmittance of 30 to 60%, a resin layer, a high refractive index on one side of a plastic film. The film can be easily obtained by transferring it to a transparent substrate using the iris color transfer film of the present invention in which the thin film layer is sequentially formed and the adhesive layer is sequentially formed.
And the obtained iris color molded article was formed with an adhesive layer, a metal thin film layer having a total light transmittance of 30 to 60%, a resin layer, and a high refractive index thin film layer on at least one surface of the transparent substrate. An iris layer, a protective layer, and a release layer are sequentially formed.

In the iris color molded product of the present invention, the color of reflected light reflected by the iris layer and the color of transmitted light passing through the iris layer and the transparent base material exhibit an iris color, respectively. The iris colors have different chromatic colors, and the iris color of the reflected light is different from the front and back of the iris color molded product.
Therefore, the iris color of the transmitted light is transparent when the iris color molded product is viewed from the front side or the back side, that is, when viewed from the side where the iris layer of the iris color molded product is formed. Even when viewed from the material side, there is no change in the color tone, so the iris color of the transmitted light will show the same color tone regardless of whether the iris color molded product is viewed from the front or back, but the iris color of the reflected light is the iris color. Since different colors are exhibited on the front and back of the molded product, the iris colored molded product of the present invention has a very characteristic design.
The iris colors of the reflected light and the transmitted light are the same as the iris color molded product described in Patent Document 1, and the reflected light reflected by the iris layer and the transmitted light transmitted through the iris layer are transmitted through the iris layer. It appears by changing the distance (optical path length) through which it passes by the viewing angle.
By doing so, the hue of the iris color of the reflected light and transmitted light is changed by the difference in the viewing angle of the iris color molded product, but when the iris color molded product is viewed from a certain angle, the iris color is changed. The whole of the iris color molded product is uniform and exhibits a single color tone.
In other words, the iris layer is flat (smooth) and has no unevenness. Therefore, when the iris color molded product is viewed from a certain angle, the optical path lengths of the reflected light and the transmitted light each have one unique value depending on the angle. Therefore, the iris color of the reflected light and the transmitted light is uniform throughout the iris color molded product and exhibits a single color tone, and the color tone changes uniformly throughout the iris color molded product according to the viewing angle. is there.
Therefore, since the conventional iris color pattern makes each layer constituting the iris layer uneven and utilizes the difference in thickness of the unevenness, when the iris color molded product is viewed from a certain angle, reflected light and As a result of each of the transmitted light having a plurality of optical path lengths, the rainbow of the colored molded product is multicolored (partly blue, part yellow, part red) along the uneven shape. A color pattern (for example, a polka-dot rainbow pattern, a grain-like rainbow pattern, etc.) appears, and the rainbow-color pattern appears no matter what angle the iris-colored molded product is viewed from. This is completely different from the iris color exhibited by the colored molded product.

  The plastic film used in the iris color transfer film of the present invention has a release anchor layer, a release layer, a protective layer, an iris layer, and an adhesive layer, which are described later, on one side as necessary. After the coloring transfer film is transferred to the transparent substrate, it is peeled off from the transparent substrate.

  The plastic film of the iris color transfer film of the present invention is not particularly limited as long as it is a plastic film conventionally used for a transfer film, and is a polyethylene terephthalate film, a polypropylene film, a polycarbonate film, a polyethylene film, a polystyrene film, a polyamide film, a poly A butyl acrylate film or the like can be used, and among them, a polyethylene terephthalate film is preferable in terms of heat resistance and strength.

The thickness of the plastic film is preferably 6 to 100 μm, more preferably 12 to 75 μm.
Further, when the iris color transfer film is used for in-mold molding transfer, the thickness is preferably 25 to 50 μm in order to enable transfer to a molded product having a complicated shape.
If the thickness is less than 6 μm, it is not preferable because wrinkles, curls, tears, etc. occur in the transfer film during the production or transfer of the iris color transfer film.
If the thickness is greater than 100 μm, the heat conduction during transfer is deteriorated, which deteriorates transfer suitability and workability and is uneconomical.
Accordingly, the thickness of the plastic film is preferably 6 to 100 μm, more preferably 12 to 75 μm, from the viewpoint of wrinkles, curling, transferability, etc. Especially when used for in-mold molding transfer, the thickness is 25 to 50 μm. It's perfect.

When the release anchor layer described later is not formed on the plastic film, the release layer formed on the iris color transfer film of the present invention is located between the plastic film and the protective film, and When the release anchor layer is formed on the plastic film, it peels at the interface with the release anchor layer.
The release layer, after transferring the iris color transfer film to the transparent substrate, is peeled off from the plastic film and formed on the outermost layer of the iris color molded product, and serves to protect the protective layer from scratches and the like. is there.
Therefore, the release layer has a protection property for protecting the iris layer from scratches, corrosion, etc., adhesion to the protection layer, release property with a plastic film or a release anchor layer, and an iris described later. It is necessary not to affect the optical properties of the layer.

  The resin used for the release layer is not particularly limited as long as it has a release property that peels at the interface with the plastic film or the release anchor layer, and an acrylic resin, a silicone resin, a wax, or the like can be used. .

The thickness of the release layer is preferably from 0.01 to 5 μm, more preferably from 0.1 to 3 μm.
If the thickness is less than 0.01 μm, the releasability is lowered, which is not preferable.
If the thickness is greater than 5 μm, coating unevenness occurs in the release layer, which is not preferable.
Moreover, it is uneconomical and expensive, and in some cases, the releasability is too good and so-called foil scattering occurs, which is not preferable.
Accordingly, the thickness of the release layer is preferably 0.01 to 5 μm from the viewpoint of releasability and the like, and is more complete if it is 0.1 to 3 μm.

  As a method for forming the release layer, a conventionally known method such as a gravure coating method, a reverse coating method, or a die coating method can be used.

  In addition, in order to improve the releasability between the plastic film and the release layer, a release anchor layer made of a resin is previously formed between the plastic film and the release layer prior to the formation of the release layer. It doesn't matter.

The release anchor layer is peeled off at the interface with the release layer after transfer and remains on the plastic film side, improving the release property between the plastic film and the release layer, and poor peeling of the plastic film during transfer It is provided for the purpose of preventing the occurrence of tears.
In particular, when the iris color transfer film of the present invention is used for in-mold molding transfer to a transparent substrate, it is preferable to form a release anchor layer.
In order to prevent the occurrence of defective peeling and tearing of the plastic film, the T-type peel strength between the release anchor layer and the release layer is preferably in the range of 1 to 100 g / 15 mm, preferably 5 to 30 g / 15 mm. If it is a range, it is still more preferable.
If the T-type peel strength exceeds 100 g / 15 mm, it is not preferable because it is impossible to prevent the peeling failure and tearing of the plastic film during in-mold transfer.
If the T-type peel strength is less than 1 g / 15 mm, the releasability is too good and so-called foil scattering occurs, which is not preferable.
Therefore, if the T-type peel strength is in the range of 1 to 100 g / 15 mm, it is possible to prevent the occurrence of defective peeling and tearing of the plastic film, especially during in-mold transfer, so the iris color transfer film of the present invention is used. The appearance of the iris molded product obtained in this way is good, and the yield is improved.

  The resin used for the release anchor layer has a peel strength that can prevent the occurrence of defective peeling and tearing of the plastic film during in-mold molding transfer, that is, the T-type peel strength between the release anchor layer and the release layer is 1. There is no particular limitation as long as the resin satisfies the range of 100 g / 15 mm, thermosetting resins such as melamine resins, amino alkyd resins, epoxy resins, acrylic resins, silicone resins, waxes, etc. Can be used, but melamine resins are particularly preferred.

The thickness of the release anchor layer is preferably 0.01 to 2 μm, particularly preferably 0.1 to 0.5 μm.
If the thickness of the release anchor layer is less than 0.01 μm, the releasability is lowered, and it is not preferable because it is impossible to prevent the peeling failure or tearing of the plastic film during in-mold transfer. At this time, the T-type peel strength also exceeds 100 g / 15 mm.
If the thickness of the release anchor layer is larger than 2 μm, the release property is too good, so-called foil scattering occurs, and it is not preferable from the viewpoint of economy.
Therefore, the thickness of the release anchor layer is preferably 0.01 to 2 μm from the viewpoint of releasability and economical efficiency, and is 0.1 to 0.5 μm.

The protective layer of the iris color transfer film of the present invention is between the release layer and the iris layer described later, and protects the iris layer together with the release layer from scratches, corrosion and the like after transfer.
Therefore, the protective layer has a protective property that protects the iris layer from scratches, corrosion, etc., adhesion to the iris layer, heat resistance that does not cause distortion, cracks, etc. due to heat during vapor deposition that forms the iris layer. At the same time, it is necessary not to affect the optical characteristics of the iris layer.

  The resin used for the protective layer is not particularly limited as long as it satisfies the above conditions, and acrylic resins, epoxy resins, melamine resins, polyester resins, and the like can be used.

As for the thickness of a protective layer, 0.1-5 micrometers is preferable, More preferably, it is 0.5-3 micrometers.
If the thickness is less than 0.1 μm, the protective property is lowered, which is not preferable.
If the thickness is greater than 5 μm, uneven coating occurs, which is not preferable.
Further, it is not preferable because it is uneconomical and costly, and in some cases affects the optical characteristics of the iris layer.
Therefore, the thickness of the protective layer is preferably from 0.1 to 5 μm from the viewpoint of the protective property, etc., and 0.5 to 3 μm is more complete.

  As a method for forming the protective layer, conventionally known methods such as a gravure coating method, a reverse coating method, and a die coating method can be used.

The iris layer of the iris color transfer film of the present invention has a structure in which a metal thin film layer, a resin layer, and a high refractive index thin film layer having a total light transmittance of 30 to 60% are sequentially formed.
The iris layer may have a structure in which a metal thin film layer having a total light transmittance of 30 to 60%, a resin layer, and a high refractive index thin film layer are sequentially formed from the protective layer side. It is good also as a metal thin film layer whose layer, resin layer, and total light transmittance are 30 to 60%.
The iris color molded product of the present invention obtained by transferring the iris color transfer film of the present invention has the above-described configuration of the iris layer, so that the iris color molded product obtained by transferring the transfer film is
(1) The color of the reflected light reflected on the iris layer side and the color of the transmitted light passing through the iris layer and the transparent base material each exhibit an iris color, and the iris color of the reflected light and the iris color of the transmitted light have different tones. Of course, the iris color of the reflected light is vivid, and the iris color of the reflected light becomes an iris color with a different tone on the front and back of the iris color molded product.
In addition, the iris color molded product obtained by transferring the iris color transfer film of the present invention is not limited to the case where the iris color of the reflected light is a blue-type iris color, and the iris color of the reflected light is changed to the red-type iris. Even if it is colored,
(2) Even if the thickness of each layer constituting the iris layer is not increased, the iris color of the reflected light can be changed to a red iris color by mainly increasing the thickness of the resin layer. The adhesion between the layers of the iris layer is sufficiently strong, and there is no occurrence of cracks in the iris layer.
(3) After performing a high-temperature, high-humidity endurance test, the adhesion between the layers of the iris layer is lower than the adhesion before the test, and the appearance changes such as changes in the color of the iris, cracks, and corrosion. Will not occur.
(4) Variation in iris color tone among production lots is reduced, and production stability is improved.
(5) The iris color molded product obtained by transferring the iris color transfer film of the present invention having a Cr thin film layer as a metal thin film layer and a ZnS thin film layer as a high refractive index reflective layer to a transparent substrate has a brighter iris color. In addition, as a result of better adhesion between the respective layers of the iris layer, the high temperature and high humidity durability is further improved.
It is possible to demonstrate such an excellent effect.

  The iris layer of the iris color transfer film of the present invention comprises the iris color molded product of the present invention obtained by transferring the iris color transfer film, the color of the reflected light reflected by the iris layer, the iris layer and the transparent substrate. The colors of the transmitted light that pass through each exhibit an iris color, the iris color of the reflected light and the iris color of the transmitted light are different tones, and the iris color of the reflected light has a different tone on the front and back of the iris color molded product. It becomes an iris color and plays a role in making the iris color of reflected light vivid.

Since the iris layer of the iris color transfer film of the present invention has a three-layer structure, the iris color of the reflected light becomes vivid and the design is very excellent.
In addition, the metal thin film layer and the high refractive index thin film layer in the iris layer can be formed by a vacuum deposition method such as an induction heating method or a resistance heating method.
Therefore, the film forming speed is very high compared with the sputtering vapor deposition method, and the productivity is improved.

As described above, the iris layer of the iris color transfer film of the present invention includes the color of the reflected light reflected by the iris layer formed by transferring the iris color transfer film onto the transparent substrate. The colors of the transmitted light passing through the iris layer and the transparent substrate are each an iris color, and the iris color of the reflected light is different from the iris color of the transmitted light, and the iris color of the reflected light is the iris color. The front and back of the molded product will have different colors, and the reflected light will have a bright iris color.
Then, the iris colors of the reflected light and the transmitted light appear by changing the optical path lengths of the reflected light and the transmitted light passing through the iris layer according to the viewing angle, like the iris color molded product described in Patent Document 1. Is.
By doing so, the iris color of the reflected light and transmitted light changes in color tone depending on the angle at which the iris color molded product is viewed, but when the iris color molded product is viewed from a certain angle, the iris color molding is performed. The entire product is uniform and exhibits a single color tone.
To describe this in more detail, when sunlight or fluorescent light enters from the side where the iris layer of the iris color molded product is formed, the color of the reflected light that is reflected by the iris layer is the viewing angle. For example, the reflected light (horizontal reflected light) reflected from the pink color of the light reflected from the iris molded article surface (vertically reflected light) almost horizontally to the iris molded article surface The color of the reflected light that is reflected by the iris layer when the light is incident from the transparent base material side of the iris color molded product depends on the viewing angle. For example, it exhibits an iris color whose color continuously changes from yellow of vertical reflected light to yellow-green of horizontal reflected light, and the color of light seen through the iris layer and the transparent substrate also depends on the viewing angle. , In a position almost perpendicular to the surface of the iris color molding Iridescent color that changes continuously from blue-purple of transmitted light (vertical transmitted light) to pink of transmitted light (horizontal transmitted light) that can be seen almost horizontally with respect to the surface of the iris molding Presents.
Therefore, when viewed as a whole, the color of the reflected light is pink or yellow when viewed from the iris layer side, yellow or yellowish green when viewed from the transparent substrate side, In addition, since the color of the transmitted light is blue-purple or pink, the reflected iris color looks different on the front and back of the iris color molded product. The color looks different from the iris color.
This is because the wavelength of the maximum value of the reflectance of the reflected light and the wavelength of the maximum value of the transmittance of the transmitted light change within the visible light region (wavelength: 370 to 780 nm) depending on the viewing angle. By controlling the above-mentioned changing wavelength range of light and transmitted light, the color tone of the iris color of the reflected light and transmitted light can be controlled.
The iris color tone of reflected light and transmitted light can be freely adjusted by adjusting the thickness of the metal thin film layer and the refractive index and thickness of the resin layer and the high refractive index thin film layer, which will be described in detail later. In addition, it can be a variety.

In addition, as described above, the iris color of the reflected light becomes an iris color having a different tone on the front and back of the iris color molded product.
This is because the iris layer has a configuration in which a metal thin film layer having a total light transmittance of 30 to 60% on one side of the resin layer is formed with a high refractive index thin film layer on the other side, By configuring the iris layer in this way, the color of the iris that appears when light incident from the metal thin film layer is reflected by the entire iris layer, and the light incident from the high refractive index thin film layer side The color tone of the iris color that appears by reflection on the entire layer is different, and as a result, the iris color of the reflected light has a different color tone on the front and back of the iris color molded product.
Therefore, since the iris color of the reflected light differs depending on whether the iris color molded product is viewed from the metal thin film layer side or the high refractive index thin film layer side, suppose that (A) the iris layer is the protective layer side. Iridescent molding obtained by transferring an iris color transfer film having a structure in which a metal thin film layer, a resin layer, and a high refractive index thin film layer having a total light transmittance of 30 to 60% are sequentially formed to a transparent substrate And (B) an iris color transfer film in which an iris layer is formed by sequentially forming a high refractive index thin film layer, a resin layer, and a metal thin film layer having a total light transmittance of 30 to 60% from the protective layer side. When an iris color molded product obtained by transferring the material to a transparent substrate is produced, the iris color of reflected light viewed from the iris layer side of (A) and the rainbow of reflected light viewed from the transparent substrate side of (B) The same coloring is applied, and the iris color of the reflected light viewed from the transparent substrate side of (A) and the reflected light viewed from the iris layer side of (B) Colored the same, and the iris color of both of the reflected light is to completely reverse the front and back.

The iris layer of the iris color transfer film of the present invention has a three-layer structure in which a metal thin film layer having a total light transmittance of 30 to 60%, a resin layer, and a high refractive index thin film layer are sequentially formed. The iris color molded article of the present invention obtained by transferring the transfer film onto a transparent substrate has a bright iris color of reflected light.
This is because the iris layer has a three-layer configuration as described above, so that the reflectance value of the reflected light of the iris color molded product is higher than that when the iris layer is one layer, and the reflected light This is because the spectrum is sharp (spectrum width is narrow).
This will be described in more detail. For example, a transparent acrylic plate having a thickness of 2 mm as a transparent substrate and a total light transmittance of 93% is black on the back surface (non-measurement surface) of the transparent acrylic plate. The book obtained by transferring the iris color transfer film of the present invention to a transparent acrylic plate having a reflectance value of 4% when measured according to JIS-R-3106 after coating. The iris molded article of the invention has a maximum reflectance of 5 ° regular reflection (hereinafter simply referred to as reflectance) when measured according to JIS-R-3106 in the visible light region (wavelength: 370 to 780 nm). The value is 20% or more, the minimum value is less than 10%, and the spectrum of the reflected light becomes sharp. As a result, the iris color of the reflected light becomes bright.
If the iris layer of the iris color transfer film is an iris layer having a maximum reflectance of 20% or more and a minimum value of less than 10%, the reflectance value of the reflected light of the iris color molded product. And the reflected light spectrum becomes sharper, resulting in a brighter iris color of the reflected light.
However, due to the configuration of the iris layer of the iris color transfer film of the present invention, the maximum value of the reflectance does not exceed 90%, and the minimum value of the reflectance does not become 0%.

  The iris color molded product of the present invention has an iris color in which the reflected light color and the transmitted light color are each an iris color, and the reflected light iris color and the transmitted light iris color are different from each other. In order for the iris color to become vivid, it is sufficient to make the iris layer such that the maximum value of reflectance is 20% or more and the minimum value is less than 10%. To do so, the iris color transfer film of the present invention is used. This can be achieved by adjusting the thickness of the metal thin film layer of the iris layer and the refractive index and thickness of each of the resin layer and the high refractive index thin film layer.

The metal thin film layer is formed on one surface of a resin layer described later by vacuum deposition.
The metal thin film layer needs to have a total light transmittance of 30 to 60%.
When the total light transmittance is less than 30%, the reflected light reflected on the metal thin film layer side exhibits a so-called half-tone metallic luster, and the refractive index and thickness of the resin layer and the high refractive index thin film layer are adjusted. Is not preferable because the purpose of the iris layer cannot be achieved.
When the total light transmittance exceeds 60%, the reflectance of the reflected light reflected on the metal thin film layer side becomes too low to make it difficult to exhibit an iris color. Again, the refractive index and thickness of the resin layer and the high refractive index thin film layer Even if the thickness is adjusted, the purpose as the iris layer cannot be achieved.

  The types of metal thin film layers are: Al thin film layer, Cr thin film layer, Sn thin film layer, Ni thin film layer, In thin film layer, Ag thin film layer, Zn thin film layer, Ti thin film layer, Si thin film layer, Ge thin film layer, Cu thin film layer Among them, a Cr thin film layer is preferable from the viewpoint of high temperature and high humidity durability.

  The thickness of the metal thin film layer is such that the total light transmittance can satisfy the range of 30 to 60%, and the thickness range is somewhat different depending on the type of the metal thin film layer, but is preferably about 6 to 30 nm. Preferably it is 8-20 nm.

The resin layer is a layer formed between the metal thin film layer and the high refractive index thin film layer described later and having a refractive index lower than that of the high refractive index thin film layer.
And the said refractive index has the preferable value of 1.3-1.6 from the point of balance with a metal thin film layer and a high refractive index thin film layer.

The resin used for the resin layer is not particularly limited as long as it has a refractive index in the range of 1.3 to 1.6 and can serve as an iris layer, and is an acrylic resin or a polyester resin. Resin such as epoxy resin, urethane resin, polyamide resin, etc. can be used, but from the viewpoint of high temperature and high humidity durability and heat resistance during vapor deposition when a ZnS thin film layer is formed on the resin layer, A curable resin is preferable, and a thermosetting resin mixed with a curing agent such as isocyanate is more preferable.
The type of the isocyanate is not particularly limited, and various isocyanates conventionally used such as TDI (tolylene diisocyanate), XDI (xylene diisocyanate), MDI (methylene diisocyanate), and HMDI (hexamethylene diisocyanate) can be used. Although usable, XDI, MDI, and HMDI isocyanates are preferably used from the viewpoint of high temperature and high humidity durability.

As described above, when the iris color of the reflected light of the iris color molded product obtained by transferring the iris color transfer film of the present invention is a red iris color, the thickness of all the layers constituting the iris layer is increased. Even if not, it is possible to easily obtain a red iris color by mainly increasing the thickness of the resin layer.
And even if the thickness of the resin layer is increased, the adhesion between each layer of the iris layer is sufficiently strong, and cracks do not occur in the iris layer, and furthermore, after performing a high temperature and high humidity durability test, The adhesion between the respective layers of the iris layer does not deteriorate from the adhesion before the test, and there is no change in appearance such as a change in iris color, cracks, and corrosion.
The thickness of the resin layer is preferably 50 to 800 nm, more preferably 100 to 600 nm.
Even if the thickness is less than 50 nm or more than 800 nm, it is preferable because the purpose as the iris layer cannot be achieved even if the thickness of the metal thin film layer and the refractive index and thickness of the high refractive index thin film layer are adjusted. Absent.
The thickness of the resin layer is preferably 50 to 800 nm in order to achieve the purpose of the iris layer, and 100 to 600 nm is perfect.

  As a method for forming the resin layer, conventionally known methods such as a gravure coating method, a reverse coating method, and a die coating method can be used.

The high refractive index thin film layer is a layer having a refractive index higher than the refractive index of the transparent base material to be transferred, which is formed on the opposite side of the resin layer from the side on which the metal thin film layer is formed by vacuum deposition. It is.
The refractive index is higher than the refractive index of the transparent substrate, and the value is preferably 1.8 to 2.5 from the viewpoint of balance with the resin layer.

The high refractive index thin film layer is not particularly limited as long as it satisfies the above refractive index, and a ZnS thin film layer, a SiO thin film layer, a TiO ₂ thin film layer, a ZrO ₂ thin film layer, a CeO ₂ thin film layer, or the like can be used.

The thickness of the high refractive index thin film layer is preferably 20 to 200 nm, more preferably 30 to 150 nm.
A thickness of less than 20 nm is not preferable because the purpose of the iris layer cannot be achieved even if the thickness of the metal thin film layer and the refractive index and thickness of the resin layer are adjusted.
If the thickness is greater than 200 nm, not only the purpose of the iris layer cannot be achieved, but also a crack occurs in the high refractive index thin film layer, and vapor deposition unevenness occurs due to deformation of the plastic film due to heat during vapor deposition. Therefore, it is not preferable.
The thickness of the high-refractive-index thin film layer is preferably 20 to 200 nm in terms of achieving the purpose of the iris layer, cracks, and the like, and is more complete if it is 30 to 150 nm.

As described above, the iris layer of the iris color transfer film of the present invention is flat and has no irregularities, so that when the iris color molded product is viewed from a certain angle, the reflected light and transmitted light are not reflected. Since the optical path length has one unique value depending on the angle, the iris color of the reflected light and the transmitted light has a uniform and single color tone throughout the iris color molded product, and the color tone depends on the viewing angle. As a result, the entire iris color molded product changes uniformly.
Therefore, an iris pattern does not appear by making each layer constituting the iris layer uneven and using the difference in thickness of the unevenness.
Therefore, in order to prevent the appearance of the iris pattern, each layer constituting the iris layer needs to be formed flat so as to eliminate the difference in thickness due to unevenness as much as possible.
When the iris color molded product of the present invention is used for the window of an audio product, which is the main application of the present invention, the housing of an electrical appliance such as a television, etc., the portion of the molded product where the iris layer is formed Thus, if the difference between the maximum value and the minimum value of the thickness of each layer constituting the iris layer is such that the iris pattern appears, it cannot be used practically.
Therefore, in order to prevent the appearance of the iris pattern, the difference between the maximum value and the minimum value of the thickness may be set to 10 nm or less, and it is perfect if the difference is set to 5 nm or less.
Further, if the difference between the maximum value and the minimum value of the thickness is set to 10 nm or less, preferably 5 nm or less, variation in iris color tone between production lots is reduced, which is also preferable from this point.
Above all, the resin layer is relatively easy to form in thickness compared to other layers (metal thin film layer, high refractive index thin film layer), preventing the appearance of iris patterns and color tone variations. For this purpose, in particular, a resin layer in which the difference between the maximum value and the minimum value of the thickness of the resin layer is 10 nm or less, and preferably 5 nm or less is perfect.

The adhesive layer of the iris color transfer film of the present invention is formed on the iris layer, and plays a role of adhering the molded product and the iris layer after the transfer.
Since the adhesive layer is formed on the iris color transfer film of the present invention, the iris color molded product of the present invention obtained by transferring the iris color transfer film to a transparent substrate is provided between the iris layer and the transparent substrate. Thus, an adhesive layer is formed, and the adhesion between the iris layer and the transparent substrate is improved.

  The resin used for the adhesive layer is not particularly limited as long as it does not affect the iris color of the iris color molded product of the present invention and adheres the molded product and the iris layer. Resin can be used.

The thickness of the adhesive layer is preferably 0.1 to 10 μm.
If the thickness is less than 0.1 μm, it is difficult to obtain adhesion, which is not preferable.
Even if the thickness is greater than 10 μm, the adhesion is not improved, it is uneconomical, and an appearance defect due to uneven coating occurs, which is not preferable.
Accordingly, the thickness of the adhesive layer is preferably from 0.1 to 10 μm from the viewpoint of adhesion and coating appearance.

  As a method for forming the adhesive layer, a conventionally known method such as a gravure coating method, a reverse coating method, or a die coating method can be used.

The iris color molded product of the present invention uses the iris color transfer film of the present invention in which a release anchor layer, a release layer, a protective layer, an iris layer, and an adhesive layer are sequentially formed on one side of a plastic film as necessary. Thus, it can be easily obtained by transferring to a transparent substrate.
The obtained iris color molded product has a configuration in which an adhesive layer, an iris layer, a protective layer, and a release layer are sequentially formed on at least one surface of the transparent substrate.
In the above-mentioned iris layer, a metal thin film layer having a total light transmittance of 30 to 60%, a resin layer, and a high refractive index thin film layer are sequentially formed.
Therefore, in the iris color molded article of the present invention, as described above, the color of the reflected light reflected and the color of the transmitted light passing through the iris layer and the transparent substrate exhibit an iris color, respectively. The iris color of the light is an iris color with a different tone, and the iris color of the reflected light is an iris color with a different tone on the front and back of the iris color molded product, and the iris color of the reflected light is vivid, and the design is very good In addition, the adhesion between the layers of the iris layer is good, and the durability at high temperature and high humidity is also excellent.
Furthermore, since the adhesive layer is formed between the iris layer and the transparent substrate, the adhesion between the iris layer and the transparent substrate is also good.
Further, the variation in the color tone of the iris color of the iris color molded product is reduced among the production lots.

  Furthermore, the iris color molded product obtained by transferring the iris color transfer film of the present invention having a metal thin film layer as a Cr thin film layer and a high refractive index reflective layer as a ZnS thin film layer to a transparent substrate has an iris color of reflected light. As a result of vividness and better adhesion between the layers of the iris layer, the high-temperature and high-humidity durability is further improved, which is also perfect in terms of the iris color and the high-temperature and high-humidity durability.

There is no restriction | limiting in particular in the transparent base material used in order to obtain the iris color molding of this invention, Resin plates, such as an acryl and a polycarbonate, a glass plate etc. can be used.
Furthermore, the transparent base material may be colored. In this case, the color of the base material and the iris color are combined to form an iris color molded product having exceptional design properties.
In addition, the iris color transfer film of the present invention can be transferred to an opaque base material, and in that case, an iris color molded product in which only reflected light exhibits an iris color.

Here, the iris color transfer film according to the present invention and the iris color molded product according to the present invention will be described with reference to the drawings.
FIG. 1 is a partially enlarged cross-sectional view showing an example of an iris color transfer film according to the present invention. On one side of a plastic film 1, a release anchor layer 2, a release layer 3, a protective layer 4 are entirely formed. A metal thin film layer 5a having a light transmittance of 30 to 60%, a resin layer 5b, an iris layer 5 including a high refractive index thin film layer 5c, and an adhesive layer 6 are sequentially formed.
FIG. 2 is a partially enlarged sectional view showing an example of an iris color molded product of the present invention obtained by transferring the iris color transfer film according to the present invention shown in FIG. 1 to one side of a transparent substrate. On one side of the base material 7, an adhesive layer 6, an high refractive index thin film layer 5c, a resin layer 5b, an iris layer 5 comprising a metal thin film layer 5a having a total light transmittance of 30 to 60%, a protective layer 4, The release layer 3 is formed sequentially.

A melamine resin is coated on one side of a long, 25 μm thick polyethylene terephthalate film by a gravure coating method to form a 0.3 μm thick release anchor layer, and an acrylic resin is applied on the release anchor layer. A release layer having a thickness of 1 μm is formed by coating by a gravure coating method, and a protective layer having a thickness of 1 μm is formed by coating an acrylic resin on the release layer by a gravure coating method. , A vacuum thin film layer having a total light transmittance of 40% and a thickness of 13 nm by a vacuum deposition method, a resin layer having a thickness of 220 nm by a gravure coating method using an acrylic resin, and a thickness of 50 nm by a vacuum deposition method. Of the ZnS thin film layer is sequentially formed, and an acrylic resin is further coated thereon by a gravure coating method to form an adhesive layer having a thickness of 1 μm. I got an iris color transfer film.
Next, a transparent acrylic plate having a thickness of 2 mm as a transparent substrate and a total light transmittance of 93%, and after applying black coating on the back surface (non-measurement surface) of the transparent acrylic plate, JIS-R The thickness of the iris color transfer film of the present invention is transferred to a transparent acrylic plate having a reflectivity value of 4% when measured in accordance with -3106. A 1 μm adhesive layer, a 50 nm thick ZnS thin film layer, a 220 nm thick resin layer, a 13 nm thick Cr thin film layer, a 1 μm thick protective layer, and a 1 μm thick release layer are sequentially formed. Iris color molding was obtained.
In the obtained iris color molding, the color of the reflected light that is reflected by the iris layer when light enters from the side where the iris layer is formed varies from the pink color of the vertical reflected light to the horizontal reflection depending on the viewing angle. The color of the reflected light that is reflected in the iris layer when light enters from the transparent base material side of the iris color molded product, showing an iris color that continuously changes in color up to the green color of light, depends on the viewing angle, It exhibits an iris color that continuously changes in color from the blue color of the vertical reflected light to the pink color of the horizontal reflected light, and the color of the light that passes through the iris layer and the transparent substrate also depends on the viewing angle. It exhibited an iris color whose color continuously changed from the orange color of the transmitted light to the yellowish green color of the horizontally transmitted light.
Further, the maximum spectral transmittance of the obtained iris color molded product is 57%, and the maximum reflectance measured from the side where the iris layer is formed is 23% (the wavelength indicating the maximum reflectance). (The peak wavelength was 650 nm), the minimum value was 4% (the wavelength (bottom wavelength) indicating the minimum value of the reflectance was 480 nm), and the maximum value of the reflectance measured from the transparent substrate side Was 40% (peak wavelength was 450 nm), the minimum value was 5% (bottom wavelength was 610 nm), and the reflection spectrum was sharp.

Comparative example

Instead of the iris layer of the embodiment, a 100 nm thick SiO thin film layer, a 130 nm thick SiO ₂ thin film layer, a 2 nm thick Cr thin film layer, A conventional iris color transfer film was obtained in the same manner as in Example except that an iris layer having a structure in which a ZnS thin film layer having a thickness of 80 nm was sequentially formed was formed.
Next, the above conventional iris color transfer film is transferred to the transparent acrylic plate used in the examples, and the adhesive layer having a thickness of 1 μm, the ZnS thin film layer having a thickness of 80 nm, and the Cr layer having a thickness of 2 nm are formed on the transparent acrylic plate. A conventional iris molded product was obtained in which a thin film layer, a 130 nm thick SiO ₂ thin film layer, a 100 nm thick SiO thin film layer, a 1 μm thick protective layer, and a 1 μm thick release layer were sequentially formed.
In the obtained iris color molded product, the color of the reflected light that is reflected by the iris layer continuously changes from pink color of vertical reflected light to yellow of horizontal reflected light, for example, depending on the viewing angle. The color of the light that appears through the iris layer and the transparent substrate varies from blue-green in the vertical transmitted light to purple in the horizontally transmitted light, depending on the viewing angle. It had a changing iris color.
In addition, the maximum reflectance of the iris molded product is 32% (peak wavelength: 750 nm), the minimum value is 4% (bottom wavelength: 510 nm), the maximum value of spectral transmittance is 90%, and the reflection spectrum. And the transmission spectrum was sharp.
Note that the obtained iris color molded product exhibited the same iris color as seen from the front and back of the molded product.
Therefore, the maximum value, the minimum value, and the maximum value of the spectral transmittance described above were the same regardless of whether they were measured from the front or back of the molded product.

  The performance shown below was compared for the iris color molded products of the present invention obtained in the examples and the iris color molded products obtained in the comparative examples.

1. Adhesion test (evaluation sample) One iris color molded product of the present invention of the example and one iris color molded product of the comparative example were each prepared as a sample.
(Evaluation method) Adhesive tape is applied to the surface of the release layer side of the iris color molded product, and then peeled off, and the release state (release area, release interface) of the release layer, protective layer, iris layer, and adhesive layer is visually observed. And observed.
(Evaluation results) Table 1
The release layer, protective layer, iris layer, or adhesive layer that was not peeled at all was marked with ◎, the partly peeled with ○, the partly peeled with Δ, and the almost peeled off with ×.

2. High-temperature and high-humidity durability test (evaluation sample) One iris color molded product of the present invention of an example and one iris color molded product of a comparative example were prepared and used as samples.
(Evaluation method) After being left in an atmosphere of a temperature of 65 ° C. and a humidity of 95% for 24 hours, an adhesion test similar to the above was performed and the presence or absence of cracks after the test was observed.
(Evaluation results) Table 1
[Adhesion] Evaluation was performed in the same manner as in the adhesion test.
[Crack] The case where no crack was generated after the test was evaluated as ◯, and the case where the crack was generated was evaluated as x.

3. Iris color stability test (evaluation sample) For the iris color transfer film of the present invention of the example and the iris color transfer film of the comparative example, 10 lots were produced in the same manner, and each of the iris color transfer films was produced. Three points are collected in the length direction for each production lot (three points of 10 cm in length × 10 cm in width are collected), transferred to the transparent base material used in the examples, and the iris color molded article of the present invention of the examples, And 30 iris color molded articles of comparative examples were produced.
Incidentally, for the iris color transfer film of the present invention of the example, the peak wavelength of the reflectance measured from the side on which the iris layer of the iris color molded product obtained by transferring the iris color transfer film is 650 nm, The bottom wavelength is 480 nm, the peak wavelength of the reflectance measured from the transparent substrate side is 450 nm, and the bottom wavelength is 610 nm. The iris color transfer film of the comparative example is manufactured using the iris color. The iris molded product obtained by transferring the transfer film was manufactured with the aim of the peak wavelength of reflectance being 750 nm and the bottom wavelength being 510 to 520 nm.
(Evaluation method) Using a spectrophotometer (U-4000 manufactured by Hitachi, Ltd.), for the iris color molded product according to the example, the peak wavelength and the wavelength from the side where the iris layer is formed and the transparent substrate side, respectively. The bottom wavelength is measured, and each of the peak wavelength and the bottom wavelength is the above-mentioned target wavelength, and the sample is an acceptable sample, and the iris color molded product according to the comparative example is from the side where the iris layer is formed. Measure the peak wavelength and bottom wavelength, and use the sample whose peak wavelength and bottom wavelength are the above target wavelengths as the acceptable sample, and calculate the ratio (acceptance rate) that each acceptable sample occupies in all 30 samples (For example, 100% if all 30 points are acceptable samples).
(Evaluation results) Table 1

It is a partially expanded sectional view which shows an example of the iris color transfer film which concerns on this invention. It is a partially expanded sectional view which shows an example of the iris color molded product of this invention obtained by transferring the iris color transfer film which concerns on this invention shown in FIG. 1 to the single side | surface of a transparent base material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plastic film 2 Release anchor layer 3 Release layer 4 Protective layer 5 Iris layer 5a Metal thin film layer 5b Resin layer 5c High refractive index thin film layer 6 Adhesive layer 7 Transparent base material

Claims (5)

  In an iris color transfer film in which a release layer, a protective layer, an iris layer, and an adhesive layer are sequentially formed on one side of a plastic film, the iris layer is a metal thin film layer having a total light transmittance of 30 to 60%, a resin An iris color transfer film in which a layer and a high refractive index thin film layer are sequentially formed.   2. The iris color transfer film according to claim 1, wherein a release anchor layer is formed between the plastic film and the release layer.   An iris color molded product obtained by transferring the iris color transfer film according to claim 1 or 2 to a transparent substrate, wherein at least one surface of the transparent substrate has an adhesive layer and a total light transmittance of 30 to 60%. An iris color molded article comprising an iris layer, a protective layer, and a release layer formed in order of a metal thin film layer, a resin layer, and a high refractive index thin film layer.   3. The iris color transfer film according to claim 1, wherein the metal thin film layer is a Cr thin film layer and the high refractive index thin film layer is a ZnS thin film layer.   A Cr thin film obtained by transferring the iris color transfer film according to claim 4 to a transparent base material, wherein the Cr thin film has an adhesive layer and a total light transmittance of 30 to 60% on at least one side of the transparent base material. An iris color molded article comprising an iris layer, a protective layer, and a release layer sequentially formed of a layer, a resin layer, and a ZnS thin film layer.

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