Paint

Abstract

To provide a paint that enables expression of a distinctive three-dimensional appearance.SOLUTION: A paint contains a magnetic pigment having luster and polarization properties.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to paints. [Background technology]

[0002] It is generally believed that creating a three-dimensional effect using commonly available paints requires advanced techniques and a lot of time. For example, when creating a three-dimensional pattern in a drawing, thick paint films are formed by applying multiple coats of paint, but since each coat requires the formation of a new paint film and drying, a large amount of paint is used and it requires a lot of work and time.

[0003] On the other hand, methods have been proposed that can more easily create a three-dimensional effect. For example, Patent Document 1 proposes forming a magnetic coating film using paint containing magnetic powder particles, and orienting the magnetic powder particles by the action of a magnetic field. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5334649 Summary of the Invention [Problem to be solved by the invention]

[0005] In the field of art, being able to create a unique impression can be an important factor in attracting people's attention. In addition, in the education of children, being able to provide new interest through unique expressions can be an important factor.

[0006] In view of the above circumstances, an object of the present invention is to provide a paint that can express a unique three-dimensional effect. [Means for solving the problem]

[0007] The present inventors came up with the idea of ​​imparting magnetism to polarizing pigments such as pearlescent pigments, which have traditionally been thought to be important when applied in a way that forms overlapping thin films in order to produce interference colors. They then formed a coating film using a paint containing such a pigment and applied a magnetic field to the coating film, finding that it was possible to express a unique three-dimensional effect that could not be obtained with pigments that are only magnetic, or pigments that are only glittery and polarizing, and thus completed the present invention.

[0008] That is, the paint according to the present invention contains a magnetic pigment that has glitter and polarizing properties.

[0009] One embodiment of the paint according to the present invention is The magnetic pigment has glittering particles as a core and magnetic particles forming an outer layer of the glittering particles, and exhibits polarizing properties due to thin film interference between the core and the outer layer.

[0010] One embodiment of the paint according to the present invention is The glittering particles are flaky aluminum particles.

[0011] One embodiment of the paint according to the present invention is The magnetic particles are iron oxide particles.

[0012] One embodiment of the paint according to the present invention is The magnetic pigment is used to draw an oriented pattern by magnetic force. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a paint that can express a unique three-dimensional effect. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a schematic diagram for explaining the effect obtained by the mass ratio of the magnetic pigment to the vehicle. [Figure 2] 1 is a photograph of a paper surface on which a pattern has been drawn using the paint of the example. DETAILED DESCRIPTION OF THE INVENTION

[0015] A paint as a first embodiment of the present invention will be described below.

[0016] The paint of the first embodiment is a liquid ink. The paint of this embodiment contains a magnetic pigment, a vehicle, and water. The paint of this embodiment is applied to the surface of paper as is, or diluted with water as necessary and applied to the surface of paper, and the magnetic pigment contained in the coating film formed on the paper surface is magnetically oriented when used.

[0017] The magnetic pigment is composed of composite particles having a glittering particle as a core and magnetic particles forming the outer layer of the glittering particle, and exhibits polarization due to thin-film interference between the core and the outer layer. That is, in a coating film containing the magnetic pigment, a first reflected light is generated by the magnetic particle and a second reflected light is generated by the glittering particle, and thin-film interference occurs due to a phase shift between these reflected lights. In addition to the thin-film interference of the composite particles that make up the magnetic pigment, it is thought that the unique three-dimensional effect is achieved by the shadows created by the alignment of these composite particles by a magnet.

[0018] The magnetic pigment preferably has a silica layer as an interference layer formed between the glittering particles and the magnetic particles, and the thickness of the silica layer can be changed to cause the magnetic pigment to strongly develop a specific color.

[0019] Examples of the glittering particles include metal particles, metal-coated particles in which a glass or resin substrate is coated with a metal, and mica. Among these, the metal particles and the metal-coated particles are preferred for enhancing the glittering properties of the paint because they have excellent light reflectivity (do not transmit light).

[0020] The glittering particles are preferably aluminum particles as the metal particles or aluminum-coated particles as the metal-coated particles. The aluminum particles are preferably silver dollar (high brightness) type particles having a scaly shape with rounded edges in a plan view, but may also be corn flake type particles having jagged edges.

[0021] The aluminum particles and the aluminum-coated particles are usually covered with a protective layer, such as a silica layer, to prevent deterioration of the aluminum. The protective layer is formed, for example, on the outside of the magnetic particles.

[0022] The magnetic particles preferably orient the magnetic pigment in the coating film by a magnetic field generated by a magnet. Examples of the magnetic particles include various ferrites such as iron oxide and γ-iron sesquioxide.

[0023] The magnetic particles preferably form a magnetic particle layer on the glittering particles via the interference layer. That is, the magnetic particles preferably form a magnetic particle layer so as to cover the interference layer. This makes it easier to generate a phase difference between the first reflected light and the second reflected light, thereby improving polarization. The magnetic particle layer can be formed on the interference layer by, for example, ferrite plating.

[0024] The content of the magnetic pigment is preferably 5% to 30% by mass, and more preferably 10% to 20% by mass, relative to the mass of the paint, which allows the magnetic pigment in the coating film before drying to flow easily due to the action of magnetic force and allows the coating film to express a unique three-dimensional effect after drying.

[0025] The vehicle may be a water-soluble polymer or a resin emulsion. Examples of water-soluble polymers include gum arabic, gum tragacanth, dextrin, glue, gelatin, polyvinyl alcohol, and polyvinylpyrrolidone. Examples of resin emulsions include alkyl acrylate copolymer emulsions, alkyl acrylate-styrene copolymer emulsions, and alkyl acrylate-vinyl acetate copolymer emulsions. These copolymers may also form salts, such as ammonium salts. The alkyl acrylate copolymer is a copolymer of two or more monomers selected from the group consisting of alkyl acrylate, alkyl methacrylate, acrylic acid, and methacrylic acid. The alkyl acrylate-styrene copolymer is a copolymer of styrene and two or more monomers selected from the group consisting of alkyl acrylate, alkyl methacrylate, acrylic acid, and methacrylic acid. The alkyl acrylate-vinyl acetate copolymer is a copolymer of vinyl acetate and two or more monomers selected from the group consisting of alkyl acrylate, alkyl methacrylate, acrylic acid, and methacrylic acid.

[0026] The mass ratio of the magnetic pigment to the vehicle (mass of the magnetic pigment / mass of the resin emulsion as solids content) is preferably 0.5 or greater, more preferably 0.8 or greater, even more preferably 1 or greater, and even more preferably 1.5 or greater. This mass ratio is preferably 5 or less, more preferably 4 or less, and even more preferably 3.5 or less. With such a paint, in addition to the glittering properties of the glittering particles, the polarization properties of the glittering particles and the magnetic particles and the three-dimensionality of the magnetic force are fully achieved, which combine to impart a unique three-dimensional effect to the paint film. Specifically, since the vehicle contributes to the thickness of the paint film, the mass ratio here can be considered to define the relative quantitative relationship between the thickness of the paint film and the magnetic pigment. Therefore, the lower limit of the mass ratio here can be considered to define the minimum amount of magnetic pigment relative to the thickness of the paint film. It is believed that this regulation can increase the number of composite particles P1 that stand up relative to the paper surface S in the coating film F due to the magnet M, as shown in Figure 1(a), thereby enhancing the three-dimensionality, and also increase the amount of composite particles P2 that lie along the paper surface S, thereby enhancing the polarization. The upper limit of the mass ratio here can be thought of as defining the maximum amount of magnetic pigment relative to the thickness of the coating film F. It is believed that this regulation can prevent the composite particles P2 that lie along the paper surface S from accumulating on the composite particles P1 that stand up relative to the paper surface S in the coating film F, as shown in Figure 1(b), thereby suppressing a decrease in three-dimensionality.

[0027] In other words, to obtain a unique three-dimensional effect due to the polarization of the composite particles and the three-dimensional effect due to magnetic force, it is preferable to specify upper and lower limits for the content of the vehicle. For example, the mass ratio of the vehicle to the magnetic pigment (mass of the solid content of the resin emulsion / mass of the magnetic pigment) is preferably 0.2 or more, more preferably 0.3 or more. Furthermore, this mass ratio is preferably 1.5 or less, more preferably 1 or less, and even more preferably 0.8 or less.

[0028] The content (solid content) of the vehicle is preferably 1% by mass or more and 10% by mass or less, more preferably 3% by mass or more and 10% by mass or less, and even more preferably 3% by mass or more and 8% by mass or less, relative to the mass of the paint.

[0029] The paint preferably further contains a humectant. Examples of humectants include glycerin, ethylene glycol, propylene glycol, dipropylene glycol, sorbitol, and urea. These humectants can delay the drying of the coating film, allowing the magnetic pigment contained in the coating film to be magnetically oriented well before it adheres to the paper or the like. This can be particularly important when forming a thin coating film that dries easily.

[0030] The content of the wetting agent is preferably 1% by mass or more and 10% by mass or less, and more preferably 5% by mass or more and 10% by mass or less, relative to the mass of the paint.

[0031] The paint preferably further contains a thickener. A clay mineral-based thickener is preferred as the thickener. A smectite containing montmorillonite as a main component is preferred as the clay mineral-based thickener. Such a thickener can impart thixotropy to the paint, making it suitable for forming thin coating films. Furthermore, the thickener is preferred in inks because it can prevent the magnetic pigment from settling over time.

[0032] The content of the clay mineral thickener is preferably 0.1% by mass or more and 1% by mass or less, and more preferably 0.4% by mass or more and 0.8% by mass or less, relative to the mass of the paint.

[0033] The water is preferably purified water such as distilled water or deionized water. The water content is preferably 40% by mass or more, more preferably 50% by mass or more, based on the mass of the paint. The water content is preferably 70% by mass or less, more preferably 65% ​​by mass or less. The paint containing the magnetic pigment can express a unique three-dimensional effect even when a thin coating film is formed due to the high water content.

[0034] The paint of the present embodiment may contain optional additives such as preservatives and antifoaming agents.

[0035] A specific method of using the paint of this embodiment is to place or arrange one or more magnets close to the surface of the paper opposite the surface on which the paint is to be formed, and apply the paint to the surface on which the paint is to be formed while applying magnetic force. Alternatively, a magnetic force may be applied to the coating film after the coating film has been formed on the surface on which the paint is to be formed and before the coating film dries.

[0036] Next, a paint according to a second embodiment of the present invention will be described. Note that the same components as those in the first embodiment will be indicated as such and detailed descriptions of those components will be omitted.

[0037] The paint of the second embodiment is a solid pigment. The paint of this embodiment contains a magnetic pigment with glitter and polarization properties and a vehicle. The paint of this embodiment is used by dissolving it in water, such as by soaking a brush in water. The paint of this embodiment is then applied to paper, and the magnetic pigment contained in the coating film formed on the paper is oriented by magnetic force. The coating film formed by the pigment can be thin because the pigment is used while being dissolved in water as described above. In contrast, paint containing the magnetic pigment can express a unique three-dimensional effect even in a thin coating film.

[0038] As the magnetic pigment of this embodiment, one having the same composition as that of the first embodiment can be used.

[0039] The content of the magnetic pigment is preferably 25% by mass to 50% by mass, and more preferably 30% by mass to 45% by mass, relative to the mass of the paint, which allows the magnetic pigment in the coating film before drying to flow easily due to the action of magnetic force and allows the coating film to express a unique three-dimensional effect after drying.

[0040] Examples of the vehicle include gum arabic, gum tragacanth, dextrin, glue, polyvinyl alcohol, and gelatin.

[0041] The mass ratio of the magnetic pigment to the vehicle (mass of the magnetic pigment / mass of the vehicle) is preferably 0.3 or more, more preferably 0.4 or more, and even more preferably 0.5 or more. Furthermore, this mass ratio is preferably 1.0 or less, and more preferably 0.9 or less. For the same reasons as in the first embodiment, such a paint can impart a unique three-dimensional effect to the coating film.

[0042] In other words, in order to obtain a unique three-dimensional effect due to the polarization of the composite particles and the three-dimensional effect due to the magnetic force, it is preferable to specify upper and lower limits for the content of the vehicle. For example, the mass ratio of the vehicle to the magnetic pigment (mass of the vehicle / mass of the magnetic pigment) is preferably 2.5 or less. Furthermore, it is preferable that this mass ratio be 1 or more.

[0043] The content of the vehicle is preferably 45% by mass or more and 70% by mass or less, and more preferably 50% by mass or more and 65% by mass or less, based on the mass of the paint.

[0044] The paint preferably further contains a wetting agent. As the wetting agent of this embodiment, the same wetting agent as in the first embodiment can be used.

[0045] The content of the wetting agent is preferably 1% by mass or more and 5% by mass or less relative to the mass of the paint.

[0046] The paint preferably further contains a thickener. Examples of the thickener include cellulose-based thickeners such as carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose. Among these, alkali metal salts of carboxymethyl cellulose (e.g., sodium salts) are preferred. These thickeners are highly hydrophilic and are therefore preferred for pigments that are dissolved in water.

[0047] The content of the cellulose-based thickener is preferably 0.1% by mass or more and 1% by mass or less, and more preferably 0.1% by mass or more and 0.5% by mass or less, relative to the mass of the paint.

[0048] The paint of this embodiment may contain water to the extent that it can maintain its solid form. The water is preferably purified water such as distilled water or deionized water.

[0049] The paint of this embodiment may also contain optional additives such as preservatives and antifoaming agents.

[0050] Although the embodiments have been shown as examples, the paint of the present invention is not limited to the configuration of the above-mentioned embodiments. Furthermore, the paint of the present invention is not limited by the above-mentioned effects. The paint of the present invention can be modified in various ways without departing from the gist of the present invention. [Example]

[0051] The present invention will be further explained below with reference to examples, but the present invention is not limited to these examples.

[0052] [Ink raw materials] Magnetic pigment 1: Contains scaly aluminum particles as cores, a silica layer that coats the aluminum particles and functions as an interference layer, and magnetic iron oxide particles that form the outer layer of the aluminum particles via the silica layer (PGD-20 manufactured by Toyo Aluminum Co., Ltd.). Veneering agent: alkyl acrylate copolymer resin emulsion (Toa Gosei Co., Ltd. alkyl acrylate copolymer, Jurimer AT-510, solids concentration 30% by mass) Humectant: Glycerin Thickener: Smectite (Kunipia, manufactured by Kunimine Industries Co., Ltd.)

[0053] The components shown in Table 1 were mixed to prepare a paint for use as an ink.

[0054] [Ink evaluation method] A paint film was formed using the prepared paint on drawing paper placed on a group of magnets formed by arranging magnets of a specified shape, and a pattern was created. After drying, the pattern was visually evaluated based on the following evaluation criteria. The results are shown in Table 1. (Evaluation criteria) 1. Three-dimensionality of the coating ○: Feels three-dimensional. △: There is a sense of three-dimensionality, but it is lacking. 2. Polarization of coating film ◎: Polarization is clearly noticeable. ○: Polarization is felt. △: Polarization is noticeable but not very noticeable.

[0055] Figure 2(a) is a photograph taken from directly above of a pattern drawn using the paint of the example and a group of magnets formed by arranging circular magnets in a circular pattern. Figure 2(b) is a photograph taken from directly above of a pattern drawn using the paint of the example and a group of magnets formed by arranging circular magnets vertically and horizontally in a grid pattern. When observed from the direction of the photograph in Figure 1, areas where the magnetic pigment concentration was relatively high and low due to the magnets were visible. Furthermore, in particular, in the areas where the magnetic pigment concentration was low, the brilliance of the aluminum particles was visually enhanced. Furthermore, when the pattern was observed from a direction different from the direction of the photograph in Figure 1, it was visually observed that due to the polarization of the magnetic pigment, both the areas with high and low magnetic pigment concentrations exhibited different colors than when observed from the same direction. Furthermore, a coating film with these properties, despite its thin thickness, exuded a unique three-dimensional feel.

[0056] [Table 1]

[0057] [Ingredients used for face paint] Magnetic Pigment 2: Contains scaly aluminum particles as a core, a silica layer that coats the aluminum particles and functions as an interference layer, and magnetic iron oxide particles that form the outer layer of the aluminum particles via the silica layer (SGD-20 manufactured by Toyo Aluminum Co., Ltd., different color from Magnetic Pigment 1). Binder: Gum Arabic (Sanei Pharmaceutical Trading Co., Ltd. Arabic Coal SS) Vehicle: Enzyme dextrin 1 (Amycol No. 3-L manufactured by Nippon Starch Chemical Co., Ltd.) Vehicle: Enzyme dextrin 2 (Amycol No. 6-L, manufactured by Nippon Starch Chemical Co., Ltd.) Humectant: Glycerin Thickener: Carboxymethyl cellulose (Sunrose F350HC-4, manufactured by Nippon Paper Industries Co., Ltd.)

[0058] [Example of Gansai production] (1) Water was poured into the container. (2) In a separate container, the wetting agent and thickener were mixed and stirred. (3) (2) was added to (1) while stirring, and the mixture was stirred for at least 10 minutes. (4) While stirring (3), the spreading agent and preservative were added and stirred until dissolved. (5) The magnetic pigment and antifoaming agent were added to (4) and stirred until no sediment remained at the bottom. (6)(5) was filled into a container for face paint, and most of the water was removed by drying to obtain face paint.

[0059] [How to evaluate facial color] The pigment was diluted at the dilution ratio shown in Table 2 below to prepare a liquid for evaluation. A coating film was formed on drawing paper placed on a magnetic sheet using a bar coater. The pattern after drying was visually evaluated based on the ink evaluation criteria described above. The results are shown in Table 2.

[0060] Table 2

Claims

1. A paint containing a magnetic pigment that has glitter and polarizing properties.

2. 2. The paint according to claim 1, wherein the magnetic pigment has glittering particles as a core and magnetic particles forming an outer layer of the glittering particles, and exhibits polarization due to thin film interference between the core and the outer layer.

3. 3. The paint according to claim 2, wherein the glittering particles are flaky aluminum particles.

4. The paint of claim 2 wherein said magnetic particles are iron oxide particles.

5. 5. The paint according to claim 1, wherein the magnetic pigment is used to create a pattern oriented by magnetic force.

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