JP2006117786A - Discoloring coating composition or ink composition and discoloring coating composition or ink - Google Patents

Abstract

Kind Code: A1 Provided are paints and inks that emit three colors of different colors according to visible light, visible light, ultraviolet light, and infrared light, and emit light with high brightness (color development), and a method of using the same. To do.
At least one rare earth element selected from the group consisting of Nd, Eu, Er, and Y, represented by the chemical formula R _x Gd _1-x VO ₄ , wherein 0.01 ≦ x ≦ 0.5. The discolored body composed of a single crystal or powder is put into a transparent solvent-based paint, water-based paint, or powder-based paint, and is dispersed and uniformed in the paint, for irradiation with visible light, ultraviolet light, or infrared light. Accordingly, each color can be changed.
[Selection] Figure 1

Description

  The present invention belongs to a paint composition or ink composition that changes color and a method of using the paint or ink that changes color, and more specifically, according to three types of light having different wavelengths, visible light, ultraviolet light, and infrared light, respectively. The present invention relates to a technical field of coating compositions and ink compositions that can change color and emit light freely (three changes) and how to use them in products.

  Conventionally, when three types of light with different wavelengths, visible light (fluorescent lamp), ultraviolet light (black light), and infrared light (sunlight) are irradiated, the paint changes to three different colors and emits light. So far there are no inks. Examples of the color changing to one color or two colors are as follows.

  As a paint that changes color in the ultraviolet system, a mixed paint (hereinafter referred to as A type) of a fluorescent paint and a phosphorescent paint is known. As a method of painting using the paint, a primer is usually applied to an object to be painted (hereinafter referred to as an object to be coated), a white primer is applied, and then the A type paint is applied. After that, by finishing coating, the color changes only under black light (ultraviolet light).

Japanese Patent Application Laid-Open No. 2001-31235 discloses a transparent base sheet, a fluorescent layer that emits light in a certain color by irradiation light from a black light, and a phosphor layer that accumulates irradiation light from the black light to store the fluorescence. A phosphorescent layer that emits light in a color different from the layer, and a phosphor sheet and a phosphorescent layer provided in a state where the phosphor layer and the phosphorescent layer are laminated in the same plane region of the base sheet are disclosed. According to the light-emitting sheet, even if the black light is turned off, the light-emitting sheet emits light in a different color (hereinafter referred to as B type).
JP 2001-31235 A

  Since the A type paint develops color under black light, there is a restriction that the undercoat must be limited to white. In addition, after coating, it is necessary to perform finish coating (top coating) by clearing in order to protect the A-type paint, which is troublesome because of many work steps.

  The B-type light-emitting sheet body requires a fluorescent layer and a phosphorescent layer to be formed in a predetermined region, and the work process is complicated. Further, the B-type light-emitting sheet body has only two types of light emission when the black light is turned off under the black light. It does not change color under visible light or infrared light, and does not change three times.

  Accordingly, an object of the present invention is to provide a composition of paint / ink that emits light (colors) with three different colors depending on three types of light having different wavelengths, visible light, ultraviolet light, and infrared light. The object is to provide a usage method that can easily and reliably produce products and their paints and inks, and realizes coating and printing on economical and high-quality products.

The coating composition that changes color according to the first aspect of the invention is a coating composition that changes color containing a color change body made of an oxide containing a rare earth element,
The discolored body is represented by the chemical formula R _x Gd _1-x VO ₄ , and 0.01 ≦ x ≦ 0.5, and the R is composed of at least one rare earth element selected from Nd, Eu, Er, and Y. Single crystal or powder,
Or represented by the chemical formula R ₂ O ₃ , wherein R is a single crystal or powder composed of at least one rare earth element selected from Y, Eu, Nd, Gd, Ho, Er,
Or represented by the chemical formula RAlO _3, where R is a single crystal or powder comprising at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er,
Or represented by the chemical formula R ₂ SiO ₅ , wherein R is a single crystal or powder composed of at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er,
It is characterized by changing color in response to irradiation with visible light, ultraviolet light, or infrared light.

The color-changing coating composition of the second invention absorbs ultraviolet rays and emits visible light to the color-changing body that emits or develops a color different from that under visible light by excitation of infrared rays or ultraviolet rays. The hue of the light emission or color development is changed by mixing a fluorescent material.

The paint composition that changes color of the third invention is characterized in that the discolored body is contained in a transparent paint.

The ink composition for color change of the fourth invention is an ink composition containing a color change body comprising an oxide containing a rare earth element,
The discolored body is represented by the chemical formula R _x Gd _1-x VO ₄ , and 0.01 ≦ x ≦ 0.5, and the R is composed of at least one rare earth element selected from Nd, Eu, Er, and Y. Single crystal or powder,
Or represented by the chemical formula R ₂ O ₃ , wherein R is a single crystal or powder composed of at least one rare earth element selected from Y, Eu, Nd, Gd, Ho, Er,
Or represented by the chemical formula RAlO _3, where R is a single crystal or powder comprising at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er,
Or represented by the chemical formula R ₂ SiO ₅ , wherein R is a single crystal or powder composed of at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er,
It is characterized by changing color in response to irradiation with visible light, ultraviolet light, or infrared light.

According to the fifth aspect of the present invention, the discolorable ink composition emits visible light by absorbing ultraviolet light into the discolored body that emits or develops a color different from that under visible light by excitation of infrared light or ultraviolet light. It is characterized in that the hue of light emission or color development is changed by mixing fluorescent materials.

The ink composition which changes color of the sixth invention is characterized in that the discolored body is contained in a transparent ink.

  According to a seventh aspect of the present invention, there is provided a coating composition that changes color, wherein the resin constituting the transparent coating is a compound such as a resin capable of forming a coating film or a monomer that can be converted into a resin, and the main skeleton is an acrylic resin or It is a polyester resin and has a molecular weight of 200 to 120,000 having a polar functional group such as a hydroxyl group, a carboxyl group, or an amino group in the side chain functional group, and the crosslinking agent is a glycidyl ether epoxy compound, a silyl group-containing epoxy compound, a polyisocyanate resin, or an amino acid. It is made of resin, and the single-crystal body or powder of the discolored body that is uniform in a particle size range of 5 to 100 μm is contained in the paint in a weight ratio of 10 to 70%. Features.

  In the ink composition for color change of the eighth invention, a curing agent and a reflective bead are added to the transparent ink, and the single crystal body of the color change material having a uniform particle shape within a range of a particle size of 5 to 100 μm. Alternatively, the powder is contained in the ink, the curing agent, and the reflective beads in a weight ratio of 10 to 70%.

The method of using the paint for discoloration of the ninth invention is as follows:
A) It is represented by the chemical formula R _x Gd _1-x VO ₄ , and 0.01 ≦ x ≦ 0.5, and the R is discolored from at least one rare earth element selected from Nd, Eu, Er, and Y. A single crystal or powder, or a single crystal having a chemical formula R ₂ O _3, where R is a main component of at least one rare earth element selected from Y, Eu, Nd, Gd, Ho, and Er A powder, or a chemical formula RAlO _3, where R is a single crystal or powder that changes color mainly containing at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er, or a chemical formula R ₂ SiO _5, where R is a discolorable colorant comprising a discolored single crystal or powder composed mainly of at least one rare earth element selected from Y, Eu, Gd, Nd, Ho and Er. Range of particle size of ~ 100μm Forming a uniform particle shape in an inner,
B) A compound such as a resin capable of forming a coating film or a monomer capable of being resinized, the main skeleton is an acrylic resin or a polyester resin, and the side chain functional group has a polarity such as a hydroxyl group, a carboxyl group, an amino group, etc. Preventing the discoloration of the discolored body in a transparent paint containing a functional group having a molecular weight of 200 to 120,000 and a crosslinking agent comprising a glycidyl ether epoxy compound, a silyl group-containing epoxy compound, a polyisocyanate resin or an amino resin. Mixing the anti-settling agent and adding the discolored material in a weight ratio of 10 to 70% with respect to the paint, and performing a dispersion / homogenization treatment with a wet disperser to produce a paint that changes color;
C) Degreasing the objects to be coated, arranging a predetermined number of the degreased objects to be coated, undercoating, and then applying baking coating with the above-mentioned discoloring paint to a film thickness of 5 μm or more and drying. By the step of finishing the object to be coated that changes color in response to irradiation with visible light, ultraviolet light or infrared light,
It is characterized by comprising.

The method of using the discoloring ink of the tenth invention is as follows:
A) It is represented by the chemical formula R _x Gd _1-x VO ₄ , and 0.01 ≦ x ≦ 0.5, and the R is discolored from at least one rare earth element selected from Nd, Eu, Er, and Y. A single crystal or powder, or a single crystal having a chemical formula R ₂ O _3, where R is a main component of at least one rare earth element selected from Y, Eu, Nd, Gd, Ho, and Er A powder, or a chemical formula RAlO _3, where R is a single crystal or powder that changes color mainly containing at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er, or a chemical formula R ₂ SiO ₅ , wherein R is a discolorable colorant comprising a discolored single crystal or powder mainly composed of at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er, 100μm particle size range Forming a uniform particle shape in,
B) Curing agent and reflective beads for enhancing color development were added to transparent ink, and the discolored material was added at a weight ratio of 10 to 70% with respect to the ink, curing agent and reflective beads, and kneaded with stirring. Later, a process of producing a discolored ink by applying a dispersion / homogenization process;
C) applying the color-changing ink to a desired portion of the printed material, drying, and finishing the coated material that changes color in response to irradiation with visible light, ultraviolet light, or infrared light; and
It is characterized by comprising.

  In the coating compositions that change color according to the first to third and seventh inventions, the color-changing bodies that change color according to visible light, ultraviolet rays, or infrared rays having different wavelengths are introduced into a transparent paint, and are dispersed and homogenized. Depending on the place / scene, the light is emitted in three beautifully high-quality changes. Therefore, this discoloring paint is applied to, for example, a watch, a mobile phone to be carried, an acoustic machine, an imaging machine, etc., cosmetics such as compact, jewelry, car accessories such as car audio, character goods, stationery, pachinko machines, etc. By painting on various products such as amusement machines and using it indoors in karaoke boxes, discos, etc., we will increase demand in response to various needs, greatly increase added value and promote sales of products To contribute. In addition, this paint that changes color is highly bright and beautifully discolored into three types and emits light spontaneously. This increases the demand for customers that attract attention and attract attention, as well as product demand due to decorativeness and aesthetics. Contribute.

In the fourth to sixth and eighth aspects of the invention, the discolored ink composition is obtained by dispersing and uniformizing a discolored body that changes color in response to visible light, ultraviolet light, or infrared light having different wavelengths. Similar to the paint that changes color, it can be printed on watches, mobile phones, acoustic machines, imaging machines, etc., cosmetics such as compacts, jewelry, car accessories such as car audio, character goods, stationery, pachinko machines, etc. By printing on various products such as gaming machines, etc., it will increase demand in response to various needs, increase added value, and contribute greatly to the promotion of products.

In addition, according to this discoloring ink composition, it is possible to perform partial printing such as a company name logo on a desired product on various products, which is also useful for product promotion and forgery prevention, and used on lipstick. Increase new demand, increase added value, and contribute greatly to product sales promotion. In addition, this discoloring ink adds a curing agent and reflective beads, diffuses the color, and enhances the three types of high-brightness and beautiful coloration. And aesthetics, and contributes to an increase in purchasing motivation.

According to the method of using the paint for discoloring according to the ninth aspect of the invention, it is possible to perform the painting by simply putting a discolored body of a prescribed particle size into a transparent prescribed paint at a predetermined ratio and baking and coating the object to be coated. Compared to simple, excellent workability and economical. Further, since the discolored body has three colors and emits light spontaneously, the undercoat is excellent in convenience that any color can be used, and any product can be changed to three types and can be shined.

According to the method of using the color-changing ink of the tenth invention, it is only necessary to put a discolored body having a predetermined particle size into the transparent ink at a predetermined ratio and print it on the substrate. It is excellent in workability and economical efficiency that can change the desired part of the printed material in three colors, and can be applied to decorations that are partially shining on all products.

  The color changing paint of the present invention will be described.

  This color-changing coating material is a color-changing body 2 made of an oxide containing a rare earth element that has a property of changing color (coloring) depending on irradiation of three types of light beams having different wavelengths from visible light, ultraviolet light, and infrared light. Is put into a predetermined paint and dispersed and uniformed in it.

One embodiment of the color change body 2 is represented by the chemical formula R _x Gd _1-x VO ₄ , 0.01 ≦ x ≦ 0.5, and R is at least 1 selected from Nd, Eu, Er, and Y Consists of seed rare earth elements. Hereinafter, preparation of powder of the discolored body 2 and preparation of a single crystal will be described.

  The preparation procedure of the powder is as follows.

An example in which V ₂ O ₅ , europium oxide (Eu ₂ O ₃ ), neodymium oxide (Nd ₂ O ₃ ), and gadolinium oxide (Gd ₂ O ₃ ) is used as a raw material for the color change body 2 will be described. _First, V 2 _{O 5} is 45.0 to 55.0 mol%, _Eu 2 _{O 3} is 0.1 to 8.0 mol%, _Nd 2 _{O 3} is 0.1 to 10.0 mol%, _Gd 2 O _The raw materials were weighed so that ₃ was 27.0 to 54.8 mol%.

  Using this raw material, a powder was prepared by the following method. This powder exhibited a blue color under visible light, but reddish luminescence was observed under ultraviolet light (black light). Under infrared rays, it changed depending on the powder particle size, and a change from purple color to whitening was observed as the particle size became smaller. The same material exhibits different colors under visible light, ultraviolet light, and infrared light.

  The powder of the color changing body 2 is obtained by a general powder production method. That is, a powder obtained by sufficiently mixing each of the raw material powders in a wet or dry manner is temporarily fired and finally sintered after pulverization. Thereafter, the unreacted vanadium oxide is washed with an alkali, filtered and dried and then sintered again, and screened to the required particle size as described later to obtain the final powder. In addition, an atmospheric atmosphere is used for the thermal synthesis of the powder used for the discoloration body of the present invention.

  Next, the preparation procedure of the single crystal of the discolored body 2 is as follows.

An example in which V ₂ O ₅ , europium oxide (Eu ₂ O ₃ ), neodymium oxide (Nd ₂ O ₃ ), and gadolinium oxide (Gd ₂ O ₃ ) is used as a raw material for this discoloration body is shown. _First, V 2 _{O 5} is 45.0 to 55.0 mol%, _Eu 2 _{O 3} is 0.1 to 8.0 mol%, _Nd 2 _{O 3} is 0.1 to 10.0 mol%, _Gd 2 O ₃ Each raw material was weighed so as to be 27.0 to 54.8 mol%.

  Using this raw material, a single crystal was grown by the following method. This single crystal exhibited a blue color under visible light, but showed a red-peach light emission under ultraviolet light (black light) and a purple color under infrared light. The same material exhibits different colors under visible light, ultraviolet light, and infrared light.

  The single crystal of the color change body 2 is obtained by a general single crystal growing method. That is, each of the raw material powders is obtained by mixing and firing, melting, and further solidifying.

  Here, an air atmosphere, an oxygen atmosphere, or a mixed atmosphere of an inert gas and oxygen is used for growing a single crystal used in the color changing body 2 of the present embodiment. And although the characteristics of the color changing body of the present invention mainly depend on the composition of the single crystal, the hue at the time of light emission or color development varies depending on the growth atmosphere, so it is necessary to appropriately control the growth atmosphere depending on the type of material. There is.

  Further, different embodiments of the color changing body 2 are as follows (1) to (4).

(1) First, it is represented by the chemical formula R ₂ O _3, where R is a single crystal or powder composed of at least one rare earth element selected from Y, Eu, Nd, Ho, and Er. An example in which neodymium oxide (Nd ₂ O ₃ ) or europium oxide (Eu ₂ O ₃ ) is used as a raw material of the color change body 2 will be described. First, the raw materials were weighed so that Nd ₂ O ₃ was 20.0-30.0 mol% and Eu ₂ O ₃ was 70.0-80.0 mol%.

  Using this raw material, a single crystal or powder material was produced by the method described above. Both show similar color changes as described below. Under visible light, blue to dark blue was exhibited, but it changed to reddish purple under sunlight (infrared rays), and red to pink light emission was observed under black light (ultraviolet rays).

(2) It is represented by a different chemical formula RAlO ₃ , and the R consists of a single crystal or powder composed of at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er. An example is shown in which europium oxide (Eu ₂ O ₃ ), gadolinium oxide (Gd ₂ O ₃ ), holmium oxide (Ho ₂ O ₃ ), and aluminum oxide (Al ₂ O ₃ ) are used as raw materials for the color change body 2. First, _Al 2 _{O 3} is from 40.0 to 60.0 mol%, _Eu 2 _{O 3} is 0.1 to 20.0 mol%, _Gd 2 _{O 3} is 0.3 to 20.0 mol%, _Ho 2 O _The raw materials were weighed so that ₃ was 35.0-60 mol%.

  Using this raw material, a single crystal or powder material was produced by the method described above. Both show similar color changes as described below. Under visible light, it had a flesh to pink color, yellow under sunlight and reddish purple under black light.

(3) It is represented by a different chemical formula R ₂ SiO ₅ , and R is composed of a single crystal or powder composed of at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er. An example in which silicon oxide (SiO ₂ ), europium oxide (Eu ₂ O ₃ ), neodymium oxide (Nd ₂ O ₃ ), and gadolinium oxide (Gd ₂ O ₃ ) is used as the raw material of the color change body 2 will be described. First, SiO ₂ is from 45.0 to 55.0 mol%, _Eu 2 _{O 3} is 0.1 to 20.0 mol%, _Nd 2 _{O 3} is 0.1 to 20.0 mol%, _Gd 2 _{O 3} Each raw material was weighed so that it might become 0.5-20.0 mol%.

  Using this raw material, a single crystal or powder material was produced by the method described above. Both show similar color changes as described below. Under visible light, it was blue, but under black light, red light emission was seen and under infrared light, purple color was seen.

(4) A fluorescent material that absorbs ultraviolet light and fluoresces visible light is mixed with the color changing material according to any one of the above embodiments (1) to (3) as a raw material of the different color changing material 2. Both of them were weighed and mixed at a ratio of 10 to 50%: 90 to 50%, and a discolored body having additive characteristics was obtained without impairing the characteristics of both.

Specifically, an example is shown in which the same raw material as in the example of (1) is used and a phosphor material containing erbium oxide (Er ₂ O ₃ ) as a main component is added. First, a powder-like discolored body similar to the example of (1) was prepared, and commercialized phosphors of Er ₂ O ₃ were mixed at a weight ratio of 50:50.

In normal cases, the color changes from blue to reddish purple when irradiated with visible light and infrared rays, but when ultraviolet light is applied, the color change becomes small when the amount of Nd ₂ O ₃ is 10 mol% or more. However, when the above phosphor was added and dispersed uniformly, even when the amount of Nd ₂ O ₃ was 10 mol% or more, the mixed powder was strongly changed in color to red by irradiation with ultraviolet rays.

Next, as the above-mentioned paint, a powder-based paint can be used in addition to a solvent-based paint and a water-based paint. In this embodiment, a case where a resin-based solvent-based paint is used will be described. This paint is transparent, and the resin constituting the transparent paint contains a compound such as a resin capable of forming a coating film or a monomer capable of being converted into a resin. However, the performance required as a transparent paint must be strong against external factors such as chemical resistance, light resistance, and solvent resistance. Therefore, the main skeleton is an acrylic resin or a polyester resin, the molecular weight is 200 to 120,000 having a polar functional group such as a hydroxyl group, a carboxyl group, and an amino group in the side chain functional group, and the crosslinking agent contains a glycidyl ether epoxy compound or a silyl group. This paint is composed of an epoxy compound, a polyisocyanate resin or an amino resin.

Then, the single crystal or powder of the color changing body 2 made of an oxide containing a rare earth element that changes color is screened with a mesh of 5 to 100 μm, and thus the particle size is uniformly unified within a range of 5 to 100 μm. It is good to use. The particle size of the single crystal or powder of the discolored body 2 can be appropriately changed according to the required roughness, color development and performance of the finished coating surface. When used as a paint as in this embodiment, it is preferably carried out with a particle size of about 5 μm. The single crystal or powder of the particulate discoloration body 2 having the predetermined particle size is charged into the paint at a weight ratio of 10 to 70%. At the same time, an anti-settling agent such as polyethylene amide for preventing settling of the discolored body 2 is also added.

Therefore, the discoloration body 2 is dispersed and homogenized in the paint, and is dispersed by a wet disperser so that the storage stability of the paint, the workability of coating, and the stability of color development can be realized (however, in this wet disperser) You may distribute it manually. Thus, the discolored body 2 is produced as a uniform product without settling in the paint, and it becomes smooth during coating without unevenness, and may be stored.

However, a mode in which a solvent such as thinner, an additive such as a curing agent, and an ultraviolet absorber is added to the colorless and transparent paint as necessary, and the mixture is stirred and mixed is also suitably implemented.

  Below, the coating method using the coating material which changes the above-mentioned color is demonstrated.

First, thinner degreasing is performed on an object to be painted. Then, the predetermined number of the degreased objects to be coated are aligned at a predetermined position so that the coating is easy.

On the other hand, the color-changing paint containing the discolored body 2 is manufactured in advance, but an embodiment in which the viscosity is adapted to the paint used for the object to be coated is suitable.

Thus, the primer is primed on the object to be coated. If this undercoat is made of a white paint such as white or high whiteness metallic, the color developability is increased, and the color changer 2 can be developed more vividly. Thereafter, the paint that changes color is sprayed on the object to be coated with an air gun to form a film thickness of 5 μm or more. Finally, the object to be coated with the paint to be discolored is put in a drying furnace and dried to complete the object to be discolored by baking. By performing the spraying and baking of the paint a plurality of times, the color of the discolored body 2 can be further enhanced. In addition, a method of coating the object to be coated with the paint that changes color by other coating methods such as electrostatic coating is also preferably performed.

Therefore, it is possible to simply and reliably finish an object to be colored that changes in color according to irradiation with visible light, ultraviolet light, or infrared light having different wavelengths.

  Next, the color-changing ink of the present invention will be described.

In the same way as the above-mentioned paint that changes color, this color-changing ink also has the property of changing its color (coloring) differently depending on the irradiation of three types of light beams having different wavelengths from visible light, ultraviolet light, and infrared light. A discolored body 2 made of an oxide is put into the following colorless and transparent ink 3. As the particle size of the single crystal or powder of the color changing body 2 used in the ink 3, a uniform particle size of 7 μm is preferable. In the case of printing (described later) with the ink 3 using the uniform discolored body 2, the surface roughness printed on the desired portion 4 can be suppressed and the performance such as wear resistance can be enhanced. Next, a curing agent (in the case of the two-component ink 3) is added. In addition, reflective beads are added to diffuse the color and enhance the color developability. And the said discoloration body 2 is thrown in in the weight ratio of 10 to 70% with respect to the said ink 3, a hardening | curing agent, and a reflective bead. Among them, the crystals of the color changing body 2 are dispersed and stirred and kneaded so as to be uniform.

As the ink 3, colorless (medium) and transparent ink is preferable, but in order to change the color variation of 3, the embodiment in which an additive such as aluminum, titanium, or a solvent is added as necessary is also preferably performed. . FIG. 2 shows variations in hue when various additives are added. Different colors depending on the type, combination, amount, etc. of the additive, as indicated by symbols A to H in the figure, the color that changes according to the irradiation of fluorescence (visible light), sunlight (infrared), or BLACK light (ultraviolet). Various combinations can be changed.

  The screen printing process using the ink 3 that changes color according to the present embodiment will be described below with reference to FIG.

First, a desired character to be printed such as a company name logo 5 or a star pattern 6 is drawn on a silk plate in a mesh shape to create a gap, and the silk plate is set on a printing machine.

On the other hand, the color changing ink 3 containing the color changing body 2 is manufactured in advance.

Thus, from below the silk plate, the metal plate 1 (printed material) is brought into contact with the silk plate, and the ink 3 that changes color from the upper surface of the silk plate is applied onto the desired portion 4 of the plate 1, and a predetermined temperature is applied. Dry and finish for a time (eg, 10 minutes at 100 ° C.).

Therefore, the company name logo 5 and the star-shaped pattern 6 can be printed on the desired portion 4 of the metal plate 1 (printed material) as illustrated in FIG. The pattern 6 can be changed into three different colors according to irradiation with three types of light rays / visible rays, ultraviolet rays or infrared rays having different wavelengths.

It is a general view of the to-be-printed material which printed the ink which changes color.

It is the table | surface which showed the variation of the ink which changes color.

Explanation of symbols

1 Substrate 2 Color change 3 Ink 4 Desired location 5 Company logo 6 Star pattern

Claims (10)

A coating composition that changes color, comprising a discolored body comprising an oxide containing a rare earth element,
The discolored body is represented by the chemical formula R _x Gd _1-x VO ₄ , and 0.01 ≦ x ≦ 0.5, and the R is composed of at least one rare earth element selected from Nd, Eu, Er, and Y. Single crystal or powder,
Or represented by the chemical formula R ₂ O ₃ , wherein R is a single crystal or powder composed of at least one rare earth element selected from Y, Eu, Nd, Gd, Ho, Er,
Or represented by the chemical formula RAlO _3, where R is a single crystal or powder comprising at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er,
Or represented by the chemical formula R ₂ SiO ₅ , wherein R is a single crystal or powder composed of at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er,
A paint composition that changes color in response to irradiation with visible light, ultraviolet light, or infrared light. Luminescence or coloring by mixing fluorescent material that absorbs ultraviolet rays and emits visible light into the discolored body that emits or develops colors in a color different from that under visible light by excitation of infrared rays or ultraviolet rays. The color-changing coating composition according to claim 1, wherein the hue is changed. 3. The paint composition which changes color according to claim 1, wherein the discolored body is contained in a transparent paint. An ink composition containing a discolored body comprising an oxide containing a rare earth element,
The discolored body is represented by the chemical formula R _x Gd _1-x VO ₄ , and 0.01 ≦ x ≦ 0.5, and the R is composed of at least one rare earth element selected from Nd, Eu, Er, and Y. Single crystal or powder,
Or represented by the chemical formula R ₂ O ₃ , wherein R is a single crystal or powder composed of at least one rare earth element selected from Y, Eu, Nd, Gd, Ho, Er,
Or represented by the chemical formula RAlO _3, where R is a single crystal or powder comprising at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er,
Or represented by the chemical formula R ₂ SiO ₅ , wherein R is a single crystal or powder composed of at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er,
An ink composition that changes color according to irradiation with visible light, ultraviolet light, or infrared light.   By mixing a fluorescent material that absorbs ultraviolet light and emits visible light into the discolored body that emits or develops a color different from that under visible light by excitation of infrared or ultraviolet light, the light emission or 5. The color-changing ink composition according to claim 4, wherein the color hue is changed. 6. The color-changing ink composition according to claim 4, wherein the discolored body is contained in a transparent ink.   The resin constituting the transparent paint is a compound such as a resin that can form a coating film or a monomer that can be converted into a resin, and the main skeleton is an acrylic resin or a polyester resin. Having a molecular weight of 200 to 120,000 having a polar functional group such as a group or an amino group, the crosslinking agent is composed of a glycidyl ether epoxy compound, a silyl group-containing epoxy compound, a polyisocyanate resin or an amino resin, and having a particle size of 5 to 100 μm. The color-changing coating material according to claim 3, wherein a single crystal or a powder of the color-changing material that is uniform within a range is contained in the coating material in a weight ratio of 10 to 70%. Composition.   A curing agent and reflective beads are added to the transparent ink, and the single-crystal or powder of the discolored body having a uniform particle size within a range of 5 to 100 μm is formed into the ink, the curing agent, and the reflective beads. The ink composition according to claim 6, wherein the ink composition is contained in a weight ratio of 10 to 70%. A) It is represented by the chemical formula R _x Gd _1-x VO ₄ , and 0.01 ≦ x ≦ 0.5, and the R is discolored from at least one rare earth element selected from Nd, Eu, Er, and Y. A single crystal or powder, or a single crystal having a chemical formula R ₂ O _3, where R is a main component of at least one rare earth element selected from Y, Eu, Nd, Gd, Ho, and Er A powder, or a chemical formula RAlO _3, where R is a single crystal or powder that changes color mainly containing at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er, or a chemical formula R ₂ SiO _5, where R is a discolorable colorant comprising a discolored single crystal or powder composed mainly of at least one rare earth element selected from Y, Eu, Gd, Nd, Ho and Er. Range of particle size of ~ 100μm Forming a uniform particle shape in an inner,
B) A compound such as a resin capable of forming a coating film or a monomer capable of being resinized, the main skeleton is an acrylic resin or a polyester resin, and the side chain functional group has a polarity such as a hydroxyl group, a carboxyl group, an amino group, etc. Preventing the discoloration of the discolored body in a transparent paint containing a functional group having a molecular weight of 200 to 120,000 and a crosslinking agent comprising a glycidyl ether epoxy compound, a silyl group-containing epoxy compound, a polyisocyanate resin or an amino resin. Mixing the anti-settling agent and adding the discolored material in a weight ratio of 10 to 70% with respect to the paint, and performing a dispersion / homogenization treatment with a wet disperser to produce a paint that changes color;
C) Degreasing the objects to be coated, arranging a predetermined number of the degreased objects to be coated, undercoating, and then applying baking coating with the above-mentioned discoloring paint to a film thickness of 5 μm or more and drying. By the step of finishing the object to be coated that changes color in response to irradiation with visible light, ultraviolet light or infrared light,
A method of using a paint that changes color, characterized by comprising: A) It is represented by the chemical formula R _x Gd _1-x VO ₄ , and 0.01 ≦ x ≦ 0.5, and the R is discolored from at least one rare earth element selected from Nd, Eu, Er, and Y. A single crystal or powder, or a single crystal having a chemical formula R ₂ O _3, where R is a main component of at least one rare earth element selected from Y, Eu, Nd, Gd, Ho, and Er A powder, or a chemical formula RAlO _3, where R is a single crystal or powder that changes color mainly containing at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er, or a chemical formula R ₂ SiO ₅ , wherein R is a discolorable colorant comprising a discolored single crystal or powder mainly composed of at least one rare earth element selected from Y, Eu, Gd, Nd, Ho, Er, 100μm particle size range Forming a uniform particle shape in,
B) Curing agent and reflective beads for enhancing color development were added to transparent ink, and the discolored material was added at a weight ratio of 10 to 70% with respect to the ink, curing agent and reflective beads, and kneaded with stirring. Later, a process of producing a discolored ink by applying a dispersion / homogenization process;
C) applying the color-changing ink to a desired portion of the printed material, drying, and finishing the coated material that changes color in response to irradiation with visible light, ultraviolet light, or infrared light; and
A method of using a color-changing ink characterized by comprising: