JP3877720B2 - Iris color transfer film and iris color molded product obtained using the same - Google Patents

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 product, and more particularly, imparts an iris color to one or both sides of a transparent substrate. A molded product having an iris layer formed thereon, and the iris layer is formed not partially on the entire surface of the transfer film and the molded product, so the visibility is excellent, and the color of reflected light reflected on the iris layer side The colors of the transmitted light that pass through the iris layer and the transparent base material are iris colors. Excellent design, and good adhesion between the layers of the iris layer, there is no decrease in adhesion or change in appearance even in high temperature and high humidity environments, and the color tone of the iris colors between production lots Small variation, audio product windows, sun Las, goggles, using the appliance housing such well phone window, such as a television that particularly beneficial, 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. Films and iris color moldings obtained using them are described.
In addition, an iris color transfer film in which the high refractive index thin film layer of the iris layer is a ZnS thin film layer and the low refractive index thin film layer is a SiO ₂ thin film layer, and an iris color molded product obtained using the same are also described. ing.
JP 2003-1997

However, the iris color transfer film described in Patent Document 1 and the iris color molded product obtained by using the film have the following drawbacks.
1. Compared to conventional iris color molded products, the adhesion between the transparent substrate and the iris layer was good, but the adhesion between each layer of the iris layer, that is, the low refractive index thin film layer and the high refraction formed on both sides There was a drawback that the adhesion with the thin film layer was slightly poor.
2. After performing 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, the adhesion between the layers of the iris layer is There are drawbacks that are lower than the adhesion before the test, and there are cases where appearance changes such as changes in the color of the iris, cracks, and corrosion occur.
3. There was a variation in iris color tone among production lots, and there was a problem that production stability was slightly lacking.

  Therefore, the applicant removed all the above-mentioned defects, and the reflected light color reflected on the iris layer side and the transmitted light color passing through the iris layer and the transparent base material each exhibited an iris color. The iris color of the transmitted light is different from the iris color of the transmitted light, and the iris color is very vivid, the design is very good, and the adhesion between the layers of the iris layer is good. In addition, it has excellent high-temperature and high-humidity durability that does not cause a decrease in adhesion or change in appearance even after a high-temperature and high-humidity durability test, and furthermore, the iris color has little variation in the color tone of the iris colors between production lots. A patent application has already been filed for the invention of the molded product and the iris color transfer film used therein (Japanese Patent Application No. 2002-142351).

Specific configurations of the iris color transfer film and the iris color molded product of the above invention are as follows:
(A) An iris color transfer film 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 the plastic film In the above, the high-refractive-index thin film layer on at least one side is formed on the low-refractive-index thin film layer via the metal thin film layer.
(B) The iris layer is a ZnS thin film layer that is a high refractive index thin film layer, a metal thin film layer, a SiO ₂ thin film layer that is a low refractive index thin film layer, a metal thin film layer, and a ZnS thin film layer that is a high refractive index thin film layer sequentially. The iris color transfer film according to (A), which is formed.
(C) From the protective layer side, the iris layer is composed of an SiO thin film layer that is a high refractive index thin film layer, an SiO ₂ thin film layer that is a low refractive index thin film layer, a metal thin film layer, and a ZnS thin film layer that is a high refractive index thin film layer. The iris color transfer film according to (A), which is formed.
(D) The iris color transfer film according to any one of (A) to (C), wherein the metal thin film layer is a Cr thin film layer.
(E) An iris color molded product obtained by transferring the iris color transfer film described in the above (A) to a transparent base material, which is formed on one side of the transparent base material on both sides of the adhesive layer and the low refractive index thin film layer. An iris layer in which a refractive index thin film layer is formed, and a protective layer are sequentially formed, and at least one side of the high refractive index thin film layer is formed on the low refractive index thin film layer via the metal thin film layer. Molding.
(F) An iris color molded product obtained by transferring the iris color transfer film described in the above (B) to a transparent base material, on one side of the transparent base material, an adhesive layer, a ZnS thin film layer / metal thin film layer / SiO ₂ An iris color molded product in which an iris layer comprising a thin film layer / metal thin film layer / ZnS thin film layer and a protective layer are sequentially formed.
(G) An iris color molded product obtained by transferring the iris color transfer film described in the above (C) to a transparent base material, on one side of the transparent base material, an adhesive layer, a ZnS thin film layer, a metal thin film layer, SiO ₂ An iris molded product in which a thin film layer, a SiO thin film layer, and a protective layer are sequentially formed.
(H) An iris color molded product obtained by transferring the iris color transfer film described in (D) above to a transparent substrate, wherein the metal thin film layer is a Cr thin film layer. Iridescent molded product as described.
It is.

However, the above-mentioned iris color molded products (E) to (H) obtained by using the iris color transfer films (A) to (D) have a design property, adhesion between the layers of the iris layer, high temperature and high temperature. Although it is excellent in moisture durability and the variation in iris color tone between production lots is small, it has the following drawbacks.
(1) Since the iris transfer film of the above (A) to (D) has an iris layer formed on the entire surface, the iris color molding of the above (E) and (H) obtained by transferring the transfer film. The product also has an iris layer formed on the entire surface, so if it is used for an inconvenient purpose if the iris layer is on the entire surface of the molded product, for example, a mobile phone window (a part that displays characters, figures, etc. on a liquid crystal display device) ) And the like, it is difficult to see the characters and graphics displayed on the window, and the visibility is poor.
(2) Since the iris color transfer film of (A) to (D) is not formed with a printing layer, the iris color molded product of (E) and (H) obtained by transferring the transfer film. In addition, a printed layer could not be formed simultaneously with the transfer.
If a print layer is to be formed on an iris color molded product, a separate process for forming only the print layer is required, resulting in poor productivity.
The present invention eliminates all the above-mentioned drawbacks, and the color of reflected light reflected on the iris layer side and the color of transmitted light passing through the iris layer and the transparent substrate each exhibit an iris color. The iris color is different from the iris color of the transmitted light, and the iris color is very vivid and has excellent design, and the adhesion between the layers of the iris layer is good. Iris color molding that is excellent in high temperature and high humidity durability that does not cause deterioration of adhesion and appearance change even after high temperature and high humidity durability test, and also has little variation in iris color tone between production lots Product and the iris color transfer film used therefor, of course, the iris layer is partially formed rather than the entire surface, so visibility can be secured, and furthermore, the printed layer is formed, so the design is Further improved iris color molded product, and There is provided an iris color transfer film to be used.

[1] In the present invention, the release layer, the protective layer, and the iris layer in which the high refractive index thin film layer is formed on both sides of the low refractive index thin film layer and the adhesive layer are sequentially formed on one surface of the plastic film. In the iris color transfer film, the iris layer is partially formed rather than the entire surface of the transfer film, and the high refractive index thin film layer on at least one side is formed on the low refractive index thin film layer via the metal thin film layer. An iris color transfer film characterized by being formed.
[2] In the present invention, the iris layer is a ZnS thin film layer that is a high refractive index thin film layer, a metal thin film layer, a SiO ₂ thin film layer that is a low refractive index thin film layer, a metal thin film layer, or a ZnS that is a high refractive index thin film layer. The iris color transfer film according to the above [1], wherein the thin film layers are sequentially formed.
[3] In the present invention, the iris layer is an SiO thin film layer that is a high refractive index thin film layer, a SiO ₂ thin film layer that is a low refractive index thin film layer, a metal thin film layer, and a ZnS that is a high refractive index thin film layer from the protective layer side. The iris color transfer film according to the above [1], wherein the thin film layers are sequentially formed.
[4] The iris color transfer film according to any one of [1] to [3], wherein the metal thin film layer is a Cr thin film layer.
[5] In the present invention, a printing layer is partially formed between the release layer and the protective layer, and the printing layer is formed so as not to cover at least the part where the iris layer is not formed. The iris color transfer film according to any one of the above [1] to [4].
[6] The present invention is an iris color molded product obtained by transferring the iris color transfer film according to the above [1] to a transparent base material, the adhesive layer and the low refractive index thin film on one side or both sides of the transparent base material The high-refractive-index thin film layer is formed on both sides of the layer, the iris layer and the protective layer are sequentially formed, and the iris layer is partially formed instead of the entire surface, and at least one side of the high refractive index The refractive index thin film layer is an iris molded product characterized in that it is formed on the low refractive index thin film layer via the metal thin film layer.
[7] The present invention provides an iris color molded product obtained by transferring the iris color transfer film according to the above [2] to a transparent substrate, the adhesive layer, the ZnS thin film layer / An iris layer composed of a metal thin film layer / SiO ₂ thin film layer / metal thin film layer / ZnS thin film layer, a protective layer are sequentially formed, and an iris layer is formed partially rather than entirely. It is an iris color molding.
[8] The present invention relates to an iris color molded product obtained by transferring the iris color transfer film according to the above [3] to a transparent substrate, wherein an adhesive layer, a ZnS thin film layer / An iris color molded article characterized in that an iris layer composed of a metal thin film layer / SiO ₂ thin film layer / SiO thin film layer, a protective layer are sequentially formed, and an iris layer is partially formed instead of the entire surface. It is.
[9] The present invention provides an iris color molded product obtained by transferring the iris color transfer film according to the above [4] to a transparent substrate, wherein the metal thin film layer is a Cr thin film layer. ] An iris color molded article according to any one of the above.
[10] The present invention is an iris color molded product obtained by transferring the iris color transfer film according to the above [5] to a transparent substrate, wherein a printing layer is partially formed between a release layer and a protective layer. In addition, in the iris color molded article according to any one of the above [6] to [9], the printed layer is formed so as not to cover at least the entire portion where the iris layer is not formed.

In the iris color transfer film of the present invention, a high refractive index thin film layer is formed on one side of a plastic film, if necessary, a release anchor layer, a release layer, and if necessary, a printing layer, a protective layer, and a low refractive index thin film layer on both sides. In the iris color transfer film in which the iris layer and the adhesive layer are sequentially formed, the iris layer is partially formed instead of the entire surface of the transfer film. When the transfer film is used for an inconvenient use when the iris layer is on the entire surface of the molded product, for example, when it is used for a window of a mobile phone (a part for displaying characters, figures, etc. by a liquid crystal display device). Makes it easy to see the characters and graphics displayed on the window, and can ensure excellent visibility.
In addition, the position where the iris layer of the iris color transfer film is formed can be easily and freely changed in accordance with the use and design of the molded product, so that it is easy to deal with a variety of small-quantity production.

  In the iris color transfer film of the present invention, the iris layer has a structure in which at least one side of the high refractive index thin film layer is formed on the low refractive index thin film layer via the metal thin film layer. The iris color molded product of the present invention obtained by transferring the iris color transfer film of No. 1 to the transparent substrate has 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 substrate. Each of them has an iris color, and the reflected light and the transmitted light have different tone colors. Excellent adhesion between each layer, no deterioration of the adhesion even after the high temperature and high humidity durability test, no change in appearance such as change in iris color, occurrence of cracks, occurrence of corrosion, etc. It has high temperature and high humidity durability.

  If the printing layer is formed on the iris color transfer film of the present invention, the printing layer can be formed simultaneously with the transfer on the iris color molded product, so that a separate printing layer forming step is unnecessary, and the productivity is increased. Will improve.

In the iris molded product of the present invention, a high refractive index thin film layer is formed on one side of a plastic film, if necessary, a release anchor layer, a release layer, and if necessary, a printing layer, a protective layer, and a low refractive index thin film layer on both sides. In the iris color transfer film in which the iris layer and the adhesive layer are sequentially formed, the iris layer is partially formed instead of the entire surface of the transfer film, and the high refractive index thin film layer on at least one side is a metal thin film Using the iris color transfer film of the present invention formed on the low refractive index thin film layer through the layer, it can be easily obtained by transferring it to one or both sides of the transparent substrate.
And the obtained iris color molded product is an adhesive layer on one or both sides of the transparent substrate, an iris layer in which a high refractive index thin film layer is formed on both sides of the low refractive index thin film layer, a protective layer, and if necessary A print layer and a release layer are sequentially formed, the iris layer is formed partially rather than on the entire surface, and at least one high refractive index thin film layer is disposed on the low refractive index thin film layer via the metal thin film layer. This is a formed configuration.

  The plastic film used for the iris color transfer film of the present invention is formed on one side thereof, as described later, in order, if necessary, a release anchor layer, a release layer, if necessary, a printing layer, a protective layer, an iris layer, and an adhesive layer. After the iris color transfer film thus formed 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 in transfer films, and is a polyethylene terephthalate film, a polypropylene film, a polycarbonate film, a polyethylene film, a polystyrene film, a polyamide film, a poly film. 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.

The release layer formed in the iris color transfer film of the present invention is usually between a plastic film and a protective layer described later, and is in close contact with the protective layer and peeled off at the interface with the plastic film.
Then, after transferring the iris color transfer film to the transparent substrate, the release layer is peeled off from the plastic film and formed on the outermost layer of the iris color molded product after the transfer, and plays a role of protecting the protective layer from scratches and the like. Is.
Therefore, the release layer has a protection property to protect the iris layer from scratches, corrosion, etc., adhesion to the print layer and the protection layer, release property to the plastic film or release anchor layer, and It is necessary not to affect the optical characteristics of the iris layer described in (1).

  The resin used for the release layer is not particularly limited as long as it has releasability that peels off at the interface with the plastic film, and acrylic resin, silicone resin, wax and 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 peels off at the interface with the release layer after transfer and remains on the plastic film side, improving the peelability between the plastic film and the release layer, and preventing the release 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.
When the T-type peel strength is 100 g / 15 mm or more, it is not preferable because it is impossible to prevent the peeling failure and tearing of the plastic film during in-mold molding transfer.
When the T-type peel strength is 1 g / 15 mm or less, the peelability 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 0.01 μm or less, 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 is also 100 g / 15 mm or more.
If the thickness of the release anchor layer is 2 μm or more, the peelability 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 peelability and economy, and is perfectly satisfactory if it 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 protects the iris layer from scratches, corrosion, etc., adhesion to the release layer, printing layer, iris layer, heat resistance that does not cause distortion or cracking due to heat during vapor deposition to form the iris layer It is necessary that the optical properties of the iris layer are not affected.

  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 is the iris color molded product of the present invention obtained by transferring the iris color transfer film, and the reflected light color and the transmitted light color each exhibit an iris color, and The iris color of the reflected light and the iris color of the transmitted light are different from each other, and it has a role of making the iris color very vivid.
The iris layer of the iris color transfer film of the present invention has a high refractive index thin film layer formed on both sides of the low refractive index thin film layer, and at least the high refractive index thin film layer on one side passes through the metal thin film layer. Thus, the structure is formed on the low refractive index thin film layer.
Among the layers constituting the iris layer, the metal thin film layer is formed for the purpose of improving the adhesion between the low refractive index thin film layer and the high refractive index thin film layer, and is used for the iris color of transmitted light and reflected light. Has little effect.
Therefore, hereinafter, when describing the relationship between the iris layer and the iris color, the metal thin film layer is omitted.

When the metal thin film layer is omitted, the iris layer of the iris color transfer film of the present invention has a structure in which the low refractive index thin film layer is sandwiched between the high refractive index thin film layer, the high refractive index thin film layer, and the low refractive index thin film. 3 layers of high refractive index thin film layer, high refractive index thin film layer, low refractive index thin film layer, high refractive index thin film layer, low refractive index thin film layer, high refractive index thin film layer The multi-layer configuration described above may be used.
Here, the high refractive index thin film layer refers to a thin film layer having a refractive index higher than the refractive index of the transparent substrate that is the transfer object, and the low refractive index thin film layer refers to the high refractive index thin film layer. A thin film layer having a refractive index lower than the refractive index.
Since the iris layer of the iris color transfer film of the present invention has three or more layers, the iris color of the reflected light and the iris color of the transmitted light are very vivid, and the design is very excellent.
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 is the color of the reflected light reflected by the iris color molded product of the present invention obtained by transferring the iris color transfer film onto the transparent substrate. The colors of transmitted light that pass through the iris layer and the transparent base material 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 is very vivid. It will be.
To describe this in more detail, when sunlight or fluorescent light enters from the iris layer side, the color of the reflected light that is reflected on the iris layer side of the iris color molded product depends on the viewing angle, for example, the rainbow From pink color of light reflected almost perpendicular to the surface of the colored molded product (vertically reflected light) to yellow of reflected light (horizontal reflected light) reflected almost horizontally to the surface of the colored molded product The color of the light that passes through the iris layer and the transparent substrate is visible at a position that is almost perpendicular to the surface of the iris color molded product, depending on the viewing angle. Presents an iris color whose color continuously changes from the blue-green color of the transmitted light (vertical transmitted light) to the purple color of the transmitted light (horizontal transmitted light) seen at a substantially horizontal position with respect to the surface of the iris color molded product. It is.
Therefore, as a whole, the reflected light has a pink or yellow iris color, and the transmitted light has a blue-green or purple iris color. The coloring looks different.
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 the reflected light and transmitted light can be freely varied by adjusting the refractive index and thickness of the high refractive index thin film layer and the low refractive index thin film layer, which will be described in detail later. It can be rich.

Since the iris layer of the iris color transfer film of the present invention has a high refractive index thin film layer formed on both sides of the low refractive index thin film layer, the rainbow of the present invention obtained by transferring the iris color transfer film to a transparent substrate. In the colored molded product, the iris color of reflected light and the iris color of transmitted light become very vivid.
This is because when the iris layer is composed of three or more layers as described above, 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 reflection is reflected. This is because the spectrum of light and the spectrum of transmitted light become 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 color molded product of the invention has a maximum spectral transmittance (hereinafter simply referred to as spectral transmittance) in the visible light region (wavelength: 370 to 780 nm) of 70% or more, and JIS- in the visible light region. The maximum value of 5 ° regular reflection when measured according to R-3106 (hereinafter simply referred to as reflectance) is 30% or more, the minimum value is less than 10%, and the spectrum of reflected light, and Since the spectrum of transmitted light is sharp, The iris color of the reflected light and the iris color of the transmitted light become very vivid.
If the iris layer of the iris color transfer film is an iris layer having a maximum reflectance of 30% or more, a minimum value of less than 10%, and a maximum spectral transmittance of 70% or more, the rainbow Since the reflectance of the reflected light and the transmittance of the transmitted light are also increased, and the spectrum of the reflected light and the spectrum of the transmitted light are sharpened. As a result, the iris color of the reflected light and the transmitted light The iris color becomes very vivid.
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%, the minimum value of the reflectance does not become 0%, and the maximum spectral transmittance is obtained. The value is not 100%.

The molded article exhibiting the iris color of the present invention has an iris color in which the reflected light color and the transmitted light color each exhibit an iris color, and the reflected light iris color and the transmitted light iris color are different from each other. In order for the coloring to become very vivid, it is sufficient to make the iris layer such that the maximum value of reflectance is 30% or more, the minimum value is less than 10%, and the maximum value of spectral transmittance is 70% or more. This can be achieved by adjusting the refractive index and thickness of the high refractive index thin film layer and the low refractive index thin film layer of the iris layer of the iris color transfer film of the present invention.
Next, the high refractive index thin film layer and the low refractive index thin film layer will be described in detail.

The high refractive index thin film layer is formed on both sides of the low refractive index thin film layer. The high refractive index thin film layer closest to the protective layer is in close contact with the protective layer, and the high refractive index thin film layer closest to the adhesive layer is in close contact with the adhesive layer. Is.
And the refractive index of a high refractive index thin film layer is higher than the refractive index of the transparent base material which is a to-be-transferred object, and the value is 1.8-2. 5 is preferred.

As a thin film layer that can be used for the high refractive index thin film layer, the thin film layer can be formed by vacuum deposition, and the refractive index of the high refractive index thin film layer is in the range of 1.8 to 2.5, And the object that can achieve the purpose as an iris layer, i.e., the color of the reflected light of the iris color molded product and the color of the transmitted light are each an iris color, the iris color is very vivid, and the iris color of the reflected light There is no particular limitation as long as the iris color of the transmitted light satisfies an iris color with a different color tone. For example, metal sulfides such as ZnS, SiO, MoO ₃ , WO ₃ , SnO ₂ , ZnO, CeO ₂ A thin film layer of a metal oxide such as can be used.
Among these, a ZnS thin film layer is preferable from the viewpoint of easy formation of the thin film layer.
The metal oxide thin film layer actually has a degree of oxidation corresponding to the refractive index. Of course, the metal oxide thin film layer having a different degree of oxidation can be used as long as it is within the range of the refractive index. It is contained in the high refractive index thin film layer of the present invention.
For example, the SiO thin film layer can be expressed as a SiOx thin film layer in consideration of the degree of oxidation, and all the SiOx thin film layers having different degrees of oxidation in which x is changed within the range of the refractive index. It is contained in the high refractive index thin film layer.

Generally, if the high refractive index thin film layer and the low refractive index thin film layer are made of the same kind of metal, the adhesion between the high refractive index thin film layer and the low refractive index thin film layer is improved. In consideration of only the property, it is not necessary to form a metal thin film layer between the high refractive index thin film layer and the low refractive index thin film layer.
However, if the low refractive index thin film layer and the high refractive index thin film layer formed on both sides thereof are all the same kind of thin film layer as described above, the high refractive index thin film layer and the low refractive index thin film layer The difference in refractive index is reduced, and the transmitted light and reflected light of the iris color molded product are less likely to become an iris color.
Therefore, the configuration of the iris layer in which the high refractive index thin film layer and the low refractive index thin film layer are made of the same kind of metal layer is the high refractive index thin film layer on one side of the low refractive index thin film layer. It is necessary that the refractive index thin film layer is a thin film layer of the same kind of metal as the low refractive index thin film layer, and the other high refractive index thin film layer is a thin film layer of a different kind of metal from the low refractive index thin film layer.
Then, by configuring the iris layer as described above, the adhesion between the high refractive index thin film layer and the low refractive index thin film layer, which are thin film layers of the same kind of metal, is improved, and the refractive index of both layers is further improved. As a result, the iris color molded product of the present invention obtained by transferring the iris color transfer film of the present invention on which the iris layer is formed is less likely to vary in the color tone of the iris color between production lots. .
Examples of the iris layer include a SiO thin film layer that is a high refractive index thin film layer / a SiO ₂ thin film layer that is a low refractive index thin film layer / a metal thin film layer / a ZnS thin film layer that is a high refractive index thin film layer.
In the case of the above-described iris layer, it is preferable that the SiO thin film layer is formed on the protective layer side and the ZnS thin film layer is formed on the adhesive layer side, since the adhesion between the iris layer and the adhesive layer is improved.

The thickness of the high refractive index thin film layer is preferably 20 to 200 nm.
If the thickness is less than 20 nm, the purpose as an iris layer cannot be achieved even if the refractive index and thickness of the low refractive index thin film 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 achievement of the purpose of the iris layer and cracks.

The low refractive index thin film layer has a high refractive index thin film layer formed on both sides thereof.
And the refractive index of a low refractive index thin film layer is lower than the refractive index of a high refractive index thin film layer, and the value is 1.3-1.6 from the point of balance with a high refractive index thin film layer. .

As the thin film layer that can be used for the low refractive index thin film layer, the thin film layer can be formed by vacuum deposition, and the refractive index of the low refractive index thin film layer is in the range of 1.3 to 1.6. and particularly limited as long as it can play a role as the iris layer is not, for example, a metal fluoride such as AlF _3, a thin film layer of _{SiO 2, Si 2 O 3,} Al 2 O 3 or the like of the metal oxide can be used .
Among these, a SiO ₂ thin film layer is preferable because of easy formation of the thin film layer.
The low refractive index thin film layer may be a thin film layer formed by coating an acrylic resin or the like.
The metal oxide thin film layer actually has a degree of oxidation corresponding to the refractive index. Of course, the metal oxide thin film layer having a different degree of oxidation can be used as long as it is within the range of the refractive index. It is contained in the low refractive index thin film layer of the present invention.
For example, the SiO ₂ thin film layer can be expressed as a SiOy thin film layer in consideration of the degree of oxidation, and all of the SiOy thin film layers with different degrees of oxidation in which y is changed within the range of the refractive index. It is included in the low refractive index thin film layer of the invention.

The thickness of the low refractive index thin film layer is preferably 30 to 300 nm.
If the thickness is less than 30 nm, the purpose as the iris layer cannot be achieved even if the refractive index and thickness of the high refractive index thin film layer are adjusted.
If the thickness is greater than 300 nm, not only the purpose of the iris layer cannot be achieved, but also a crack occurs in the low refractive index thin film layer, or deposition unevenness occurs due to deformation of the plastic film due to heat during deposition. Therefore, it is not preferable.
The thickness of the low refractive index thin film layer is preferably 30 to 300 nm in terms of achieving the purpose of the iris layer, cracks, and the like.

By appropriately selecting the type, refractive index, and thickness of the high refractive index thin film layer and the type, refractive index, and thickness of the low refractive index thin film layer to be formed in the iris color transfer film of the present invention, the iris color transfer The iris color molded product of the present invention obtained by transferring the film can have a desired color tone and a vibrant iris color for the reflected light iris color and the transmitted light iris color.
The high refractive index thin film layer formed on both sides of the low refractive index thin film layer may have the same type, refractive index, and thickness of the thin film layer on one side and the other side, and are completely different from each other. Another high refractive index thin film layer may be used.

The metal thin film layer is formed between the low refractive index thin film layer and the high refractive index thin film layer on at least one side, and provides adhesion between the low refractive index thin film layer and the high refractive index thin film layer and high temperature and high humidity durability. It is to improve.
The metal thin film layer should hardly affect the iris color of transmitted light and reflected light.
Accordingly, the thickness of the metal thin film layer needs to be extremely thin, and is preferably in the range of 0.1 to 10 nm, particularly preferably in the range of 0.5 to 5 nm.
If the thickness is less than 0.1 nm, adhesion and high-temperature and high-humidity durability will not be improved. If the thickness is more than 10 nm, the iris color of the iris color molded product lacks vividness, and in some cases the desired iris color can be obtained. Since it disappears, it is not preferable.
In addition, the metal thin film layer usually needs to be formed between the low refractive index thin film layer and the high refractive index thin film layer on at least one side. As described above, the iris layer has a low refractive index configuration. Of the high refractive index thin film layers on both sides of the refractive index thin film layer, one high refractive index thin film layer is a thin film layer of the same kind of metal as the low refractive index thin film layer, and the other high refractive index thin film layer is a low refractive index thin film. In the case of a thin film layer of a metal species different from the layer, the adhesion between the high refractive index thin film layer and the low refractive index thin film layer, which is a thin film layer of the same metal species, is improved, so a metal thin film layer is formed in particular. You don't have to.

In addition, as a thin film layer that can be used as a metal thin film layer, a thin film layer can be formed by a vacuum deposition method, the adhesion between a low refractive index thin film layer and a high refractive index thin film layer can be improved, and an iris color can be obtained. There is no particular limitation as long as it does not affect the film, and for example, a thin film layer such as Cr, Ni, Cu or the like can be used.
Among these, a Cr thin film layer is preferable in terms of adhesion and durability at high temperature and high humidity.
Since the metal thin film layer is extremely thin as described above, it is considered that a part of the metal thin film layer is in an oxidized state. Included in the thin film layer.

The iris layer of the iris color transfer film of the present invention is partially formed rather than the entire surface of the transfer film.
Accordingly, the portion of the transfer film where the iris layer does not exist has good visibility. For example, when the transfer film is used in a window of a mobile phone, the iris layer does not exist in the window portion. It is easy to see the characters and figures displayed by the above, and the visibility can be ensured.
A conventional iris color transfer film having an iris layer formed on the entire surface can be used for a window of an audio product. This is a display using an LED (Light Emitting Diode) as a display device usually viewed through the window of the audio product. Since this is a device and the displayed information is also simple text information such as numbers, it was not required to have excellent visibility, so an iris layer was formed on the window using a conventional transfer film. But it didn't matter.
However, the display device viewed through the window of a mobile phone is a liquid crystal display device, and the displayed information covers not only characters such as numbers but also complex figures and patterns, still images such as photographs, moving images, etc. Although excellent visibility for clearly recognizing information is required, there is a problem that visibility is deteriorated when an iris layer is formed in the window.
If the iris color transfer film of the present invention is used, it is not necessary to form an iris layer on any part of the molded product. The transfer film can be used.
In addition, the position where the iris layer of the iris color transfer film is formed can be easily and freely changed in accordance with the use and design of the molded product, so that it is easy to cope with a small variety of products.

  As a method for forming the iris layer of the iris color transfer film of the present invention partially rather than the entire surface of the transfer film, for example, a release anchor layer, a release layer, and a protective layer are sequentially formed on one surface of the plastic film. Then, a water-soluble paint is printed on the protective layer on a desired portion to partially form a water-soluble paint layer, and further, an iris layer is formed on the entire surface, followed by washing with water and partially If the formed water-soluble paint layer and the iris layer on the water-soluble paint layer are removed, the iris layer where no water-soluble paint layer exists is left, and an adhesive layer is formed on the entire surface, the rainbow of the present invention is obtained. A colored transfer film is obtained.

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 printing layer formed as necessary in the iris color transfer film of the present invention is between the release layer and the protective layer, and improves the design of the iris color molded product obtained by transferring the transfer film.
Moreover, the iris color of the transmitted light does not appear in the part where the printing layer is formed, but the iris color of the reflected light is compared with the part where the printing layer is not formed due to the concealment effect of the printing layer. There is also an effect of becoming more vivid.
Of course, the printed layer may be a pattern printed with a combination of two or more colors, not just one color.
The printing layer must be formed partially rather than on the entire surface of the transfer film.
If the printed layer covers all the part where the iris layer does not exist, it is meaningless to form the part where the iris layer does not exist to ensure visibility, so at least a part of the part where the iris layer does not exist is left. It is necessary to form the printing layer, that is, to form the printing layer so as not to cover at least the entire portion where the iris layer is not formed.
What is necessary is just to determine suitably the color of a printing layer, a pattern, a printing position, etc. according to a desired iris color molded product.

As the resin used for the printing layer, various printing inks conventionally used for the printing layer such as acrylic resin, vinyl chloride resin, acrylic / vinyl resin, and the like can be used.
Moreover, conventionally well-known methods, such as a gravure coat method and a screen printing method, can be used for the formation method of a printing layer.

The iris color molded article of the present invention has a release anchor layer, a release layer, if necessary, a printing layer, a protective layer, an iris layer, and an adhesive layer sequentially formed on one side of a plastic film. It can be easily obtained by transferring to a transparent substrate using a transfer film.
The resulting iris color molded article has a configuration in which an adhesive layer, an iris layer, a protective layer, and optionally a printing layer and a release layer are sequentially formed on one or both sides of the transparent substrate.
The iris layer has a high refractive index thin film layer formed on both sides of the low refractive index thin film layer, and at least one high refractive index thin film layer on the low refractive index thin film layer via the metal thin film layer. Is 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 different, the iris color is very vivid, the design is very good, the adhesion between the layers of the iris layer is good, and high temperature and high humidity durability Also excellent in properties.
The iris layer of the iris color molded product of the present invention is partially formed rather than the entire surface of the molded product.
Therefore, since the visibility is good in the portion where the iris layer of the molded product does not exist, for example, when the transfer film is used for a window portion of a cellular phone, characters and figures displayed on the window portion are easy to see, Visibility can be ensured, and the transfer film can be used for an inconvenient use when the iris layer is on the entire surface of the molded product.
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.

From the viewpoint of easy formation of the thin film layer, the iris color transfer film of the present invention in which the high refractive index thin film layer is a ZnS thin film layer and the low refractive index thin film layer is a SiO ₂ thin film layer is transferred to a transparent substrate. The iris-colored molded product of the present invention thus obtained has an adhesive layer, an iris layer composed of a ZnS thin film layer / metal thin film layer / SiO ₂ thin film layer / metal thin film layer / ZnS thin film layer, and a protective layer on one side of a transparent substrate. It becomes the structure formed sequentially, and is more suitable from points, such as productivity.

Also, the iris layer is formed from the protective layer side in the order of the SiO thin film layer, which is a high refractive index thin film layer, the SiO ₂ thin film layer, which is a low refractive index thin film layer, the metal thin film layer, and the ZnS thin film layer, which is a high refractive index thin film layer. An iris color molded product obtained by transferring the iris color transfer film to a transparent substrate is formed on one side of the transparent substrate with an adhesive layer, ZnS thin film layer / metal thin film layer / SiO ₂ thin film layer / SiO thin film layer. The iris layer and the protective layer are sequentially formed, and the iris color tone of the iris color molded product has less variation among production lots.

  Furthermore, the iris color molded product obtained by transferring the iris color transfer film of the present invention having a Cr thin film layer to a transparent substrate has better adhesion between the layers of the iris layer and is resistant to high temperatures and high humidity. It is more thorough in terms of sex.

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 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 printing layer 4, a protective layer 5, A high refractive index thin film layer 6a, a low refractive index thin film layer 6b, a metal thin film layer 6c, an iris layer 6 comprising a high refractive index thin film layer 6a, and an adhesive layer 7 are sequentially formed thereon, and the iris layer is partially formed. The printed layer is formed while leaving at least a part of the portion where the iris layer does not exist.
FIG. 2 is a partially enlarged cross-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 a transparent substrate. 8 is an adhesive layer 7, on which a high refractive index thin film layer 6a, a metal thin film layer 6c, a low refractive index thin film layer 6b, an iris layer 6 comprising a high refractive index thin film layer 6a, a protective layer 5 and a printing layer 4 are formed. The release layer 3 is sequentially formed, the iris layer is partially formed, and at least a part of the portion where the iris layer does not exist is formed as a printing layer.

[Example 1]
A melamine resin is coated on one side of a 38 μm thick polyethylene terephthalate film by a gravure coating method to form a 0.5 μm thick release anchor layer, and then an acrylic resin is coated by a gravure coating method. Thus, a release layer having a thickness of 0.7 μm was formed.
Furthermore, a printing layer having a desired pattern is formed using acrylic ink, and then a protective layer having a thickness of 1 μm is formed on the entire surface using acrylic resin, and a water-soluble paint is used on the protective layer. Thus, a water-soluble paint layer was formed only on the portion where the iris layer was not formed (the shape of the window portion of the mobile phone).
In addition, the printing layer, the protective layer, and the water-soluble paint layer were formed by printing in one step with a multicolor printer.
Furthermore, on the water-soluble paint layer and on the protective layer on which the water-soluble paint layer is not formed, a 50 nm thick SiO thin film layer and a low refractive index thin film layer are formed as a high refractive index thin film layer by vacuum deposition. A 65 nm thick SiO ₂ thin film layer, a 2 nm thick Cr thin film layer as a metal thin film layer, and a 41 nm thick ZnS thin film layer as a high refractive index thin film layer were sequentially formed on the entire surface to obtain a laminated film. .
The water-soluble paint layer was formed on at least a part of the portion where no print layer was present.
Next, the laminated film is washed with water to remove the partially formed water-soluble paint layer and the iris layer on the water-soluble paint layer, while leaving the iris layer in a portion where the water-soluble paint layer does not exist, Furthermore, an acrylic resin was coated by a gravure coating method to form an adhesive layer having a thickness of 1 μm on the entire surface, thereby obtaining an iris color transfer film of the present invention in which an iris layer was partially formed.
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. 1 μm adhesive layer, 41 nm thick ZnS high refractive index thin film layer, 2 nm thick Cr thin film layer, 65 nm thick SiO ₂ low refractive index thin film layer, 50 nm thick SiO high refractive index thin film layer in this order Thus, an iris color molded article of the present invention was obtained in which an iris layer, a protective layer having a thickness of 1 μm, a printing layer, and a release layer having a thickness of 0.7 μm were sequentially formed.
In the obtained iris color molded article of the present invention, the portion where the iris layer is present and the print layer is not present is that the color of the reflected light that is reflected on the iris layer side depends on the viewing angle and the blue color of the vertical reflected light. From the yellow of the vertically transmitted light, depending on the viewing angle, the color of the light that passes through the iris layer and the transparent acrylic plate also exhibits an iris color that continuously changes from purple to the horizontally reflected light purple. As a result, the color of the reflected light gradually changed to the yellowish green color of the horizontally transmitted light, so that the reflected light iris color and the transmitted light iris color looked different.
In the obtained iris color molded product, the maximum reflectance of the portion where the iris layer is present and the printed layer is not present is 35% (the wavelength (peak wavelength) indicating the maximum reflectance is 380 nm). The minimum value was 5%, the maximum value of spectral transmittance was 90%, and the reflection spectrum and transmission spectrum were sharp.

[Example 2]
Using the iris color transfer film of Example 1, in-mold molding transfer was performed on one side (back side) of a transparent resin molded product, and a mobile phone casing in which a window portion was formed was produced.
Since the window portion of the cellular phone casing and the portion of the transfer film where the iris layer does not exist (the shape of the window portion of the cellular phone) are transferred in alignment, an iris layer is formed on the window portion. Not.

Comparative example

[Comparative Example 1]
An iris color having an iris layer formed on the entire surface in the same manner as in Example 1 except that the water-soluble paint layer and the Cr thin film layer of Example 1 were not formed and the laminated film was not washed with water. A transfer film was obtained.
Next, the above-mentioned iris color transfer film was transferred to the transparent acrylic plate used in Example 1, and a 1 μm thick adhesive layer, a 41 nm thick ZnS high refractive index thin film layer, 65 nm thick SiO ₂ low refractive index thin film layer, 50 nm thick SiO high refractive index thin film layer partially formed in this order, an iris layer, a 1 μm thick protective layer, a printed layer, a 0.7 μm thick separation layer An iris-shaped molded product in which mold layers were sequentially formed was obtained.
The obtained iris color molded article exhibited the same iris color as that of the portion of the iris color molded article according to the present invention of Example 1 where the iris layer was present and the print layer was not present.
The maximum reflectance of the molded product is 35% (the wavelength (peak wavelength) indicating the maximum reflectance was 380 nm), the minimum value is 5%, and the maximum spectral transmittance is 90%. %, And the reflection spectrum and the transmission spectrum were sharp.

[Comparative Example 2]
Using the iris color transfer film of Comparative Example 1, in-mold molding transfer was performed on one side (back side) of a transparent resin molded product, and a mobile phone casing in which a window portion was formed was produced.
Since the iris film was formed on the entire surface of the transfer film, the iris layer was formed on the window portion of the casing.

  About the iris color molded article of the present invention obtained in Example 1 and the iris color molded article obtained in Comparative Example 1, and the mobile phone casing which is the iris color molded article of the present invention obtained in Example 2 and About the mobile telephone housing | casing obtained by the comparative example 2, evaluation shown below was performed and the performance was compared.

1. Visibility test (evaluation sample) One mobile phone case which is the iris molded product of the present invention of Example 2 and one mobile phone case of Comparative Example 2 were prepared and used as samples.
(Evaluation Method) A liquid crystal display device was installed on the back side of the window portion, and characters, graphics, etc. were displayed on the display device, and the characters, graphics, etc. displayed from the front side of the window portion were visually observed.
(Evaluation results) When the characters, graphics, etc. displayed from the front side of the window portion were viewed, the characters and graphics that were clearly recognized were marked with ◯, and those that were not clearly recognized were marked with ×.

2. Adhesion Test (Evaluation Sample) One iris color molded product of the present invention of Example 1 and one iris color molded product of Comparative Example 1 were prepared and used as samples.
(Evaluation method) Adhesive tape is applied to the protective layer side surface of the iris color molded product, and then peeled off, and the release state (peeling area, peeling interface) of the release layer, printing layer, protective layer, iris layer, and adhesive layer is checked. It was observed visually.
(Evaluation results) Table 1
The case where the protective layer, the iris layer or the adhesive layer was not peeled at all was marked with 一部, the partly peeled off with ○, the partly peeled off with Δ, and the almost peeled off with ×.

3. High-temperature and high-humidity durability test (evaluation sample) One iris color molded product of the present invention of Example 1 and one iris color molded product of Comparative Example 1 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.

4). Scratch resistance test (evaluation sample) One iris color molded product of the present invention of Example 1 and one iris color molded product of Comparative Example 1 were prepared and used as samples.
(Evaluation method) The surface of the release layer was scratched with a nail, and the presence or absence of scratches was visually observed.
(Evaluation results) Table 1
The case where no scratch was generated was marked with ◯, and the case where scratch was generated was marked with ×.

As is clear from Table 1, the iris molded product of the present invention of Example 1 has good adhesion, and there is no decrease in adhesion or occurrence of cracks even after the high temperature and high humidity durability test. It can be seen that even in the scratch resistance test, no scratch is generated, and the adhesiveness, high temperature and high humidity durability, and scratch resistance are excellent.
Although the iris color molded article of Comparative Example 1 is excellent in scratch resistance because a release layer and a protective layer are formed on the iris layer, as in the iris color molded article of the present invention of Example 1, It can be seen that in the adhesion test, only partial peeling occurred and the adhesion was slightly inferior, and in the high-temperature and high-humidity endurance test, it almost peeled off, and cracks occurred in the iris layer, resulting in lack of high-temperature and high-humidity durability.
The peeling interface in the adhesion test and the high-temperature and high-humidity durability test are both between the ZnS thin film layer and the SiO ₂ thin-film layer. This seems to be the cause of this.
Moreover, although the window part of the mobile phone of Example 2 had excellent visibility, the window part of the mobile phone of Comparative Example 2 was inferior in visibility.

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 which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plastic film 2 Release anchor layer 3 Release layer 4 Print layer 5 Protective layer 6 Iris layer 6a High refractive index thin film layer 6b Low refractive index thin film layer 6c Metal thin film layer 7 Adhesive layer 8 Transparent base material

Claims (10)

  In an iris color transfer film in which a release layer, a protective layer, an iris layer having a high refractive index thin film layer formed on both sides of a low refractive index thin film layer, and an adhesive layer are sequentially formed on one side of the plastic film, the iris The layer is formed not on the entire surface of the transfer film but partially, and the high refractive index thin film layer on at least one side is formed on the low refractive index thin film layer via the metal thin film layer. Iris color transfer film. The ZnS thin film layer, which is the high refractive index thin film layer, the metal thin film layer, the SiO ₂ thin film layer, which is the low refractive index thin film layer, the metal thin film layer, and the ZnS thin film layer, which is the high refractive index thin film layer, are sequentially formed. The iris color transfer film according to claim 1, wherein As for the iris layer, a SiO thin film layer that is a high refractive index thin film layer, a SiO ₂ thin film layer that is a low refractive index thin film layer, a metal thin film layer, and a ZnS thin film layer that is a high refractive index thin film layer were sequentially formed from the protective layer side. The iris color transfer film according to claim 1, wherein   4. The iris color transfer film according to claim 1, wherein the metal thin film layer is a Cr thin film layer.   A printing layer is partially formed between the release layer and the protective layer, and the printing layer is formed so as not to cover at least the entire portion where the iris layer is not formed. 4. The iris color transfer film according to any one of 4 above.   An iris color molded product obtained by transferring the iris color transfer film according to claim 1 to a transparent substrate, wherein the transparent substrate has a high refractive index on one side or both sides of the adhesive layer and the low refractive index thin film layer on both sides. The iris layer on which the thin film layer is formed, and the protective layer are sequentially formed. The iris layer is formed partially rather than on the entire surface, and the high refractive index thin film layer on at least one side is a metal thin film layer. An iris color molded product characterized by being formed on a low refractive index thin film layer. An iris color molded product obtained by transferring the iris color transfer film according to claim 2 to a transparent substrate, wherein an adhesive layer, a ZnS thin film layer / metal thin film layer / SiO ₂ thin film layer is formed on one or both surfaces of the transparent substrate. An iris color molded article characterized in that an iris layer comprising a / metal thin film layer / ZnS thin film layer, a protective layer are sequentially formed, and the iris layer is partially formed rather than the entire surface. An iris color molded product obtained by transferring the iris color transfer film according to claim 3 to a transparent substrate, wherein an adhesive layer, ZnS thin film layer / metal thin film layer / SiO ₂ thin film layer is formed on one or both surfaces of the transparent substrate. An iris color molded article characterized in that an iris layer composed of a / SiO thin film layer, a protective layer are sequentially formed, and the iris layer is partially formed rather than the entire surface.   The iris color molded product according to any one of claims 6 to 8, wherein the iris color molded product obtained by transferring the iris color transfer film according to claim 4 to a transparent substrate, wherein the metal thin film layer is a Cr thin film layer.   An iris color molded product obtained by transferring the iris color transfer film according to claim 5 to a transparent substrate, wherein a print layer is partially formed between the release layer and the protective layer, and the print layer is The iris color molded article according to any one of claims 6 to 9, which is formed so as not to cover at least a portion where no iris layer is formed.

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