JPH10292129A - Light-transmissible powder coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a powdered coating material deep in color feeling, clear in coloring, and highly light-transmissible enough to cause no reduction in color reproducibility when toned. SOLUTION: This powder coating material of the three primary colors is obtained by dispersing 1 to 20 pts.wt. of each of phthalocyanine-based pigment, quinacridone-based pigment and acetoacetic allylide-based azo pigment in 100 pts.wt. of a transparent resin in such a way that there is fallen into the following ranges the number of agglomerates of each pigment contained in a coating film formed from each pigment and having a thickness of 1 μm and area of 1,000,000 μm<2> : (1) the number of agglomerates each having a surface area of 10 to 12.5 μm<2> : cyanogen; <=120, magenta; <=60, and yellow; <=35 (2) the number of agglomerates each having a surface area of 12.5 to 15 μm<2> : cyanogen; <=70, magenta; <=30, and yellow; <=15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a translucent powder coating having good color reproducibility.

[0002]

2. Description of the Related Art Paints contribute not only to cosmetic effects such as imparting color and gloss, but also to protection of objects to be coated, in terms of moisture resistance, chemical resistance, sterilization, and the like. As the above-mentioned paint, a liquid paint or an emulsion paint using an organic solvent or water is generally used. However, with the recent increase in concern for environmental protection and safety, a powder paint which does not require a solvent is used. Is attracting attention.

[0003] The coating method using a powder coating includes (i) a fluid immersion method in which the powder coating is brought into contact with a heated object to be melted and adhered, and (ii) the powder coating is charged. After electrostatically adhering to an object to be coated, an electrostatic coating method in which a continuous coating film is formed by heating and melting, and (iii) an electrostatic flow in which the fluid immersion method and the electrostatic coating method are combined. There is an immersion method and the like.

[0004] However, powder coatings have been considered to be insufficiently practical because, unlike conventional liquid coatings, they cannot be easily toned at coating sites. That is, conventionally, the toning of the powder coating is performed only during the production of the powder coating through many steps of mixing, melting, kneading, cooling, pulverizing, and classifying components such as a binder resin and a colorant. Since it is difficult to make color adjustments afterwards, it is necessary to prepare a large number of powder paints with slightly different colors in order to obtain the same effect as the delicate toning at the painting site with liquid paints. Such a method requires a great deal of time and labor, and is not practical especially in terms of production efficiency and production cost.

[0005] For example, in the case of producing a powder paint having a different color using one production facility, a so-called empty space is provided at the end of the production so that the color of the powder paint produced earlier is not affected. In other words, after manufacturing non-products with colorless resin, temporarily shut down the manufacturing equipment, clean every corner of the equipment, and then use a new color powder coating to stabilize the color. It is not practical because it wastes time and labor, and wastes the material until the color production becomes stable until the production is started. Further, it is more wasteful to prepare manufacturing facilities for the number of colors, and it is not practical.

Therefore, recently, two or more colored powders having a very small particle diameter of 10 μm or less in average particle diameter are dry-mixed and color-matched, and then granulated to a particle diameter suitable for use as a powder coating. (Japanese Patent Laid-Open No. 7-18)
No. 8586). According to this method, it is possible to easily produce a powder coating having a color other than the color of the colored powder produced at the factory.

However, the colored powder used in the above-mentioned method has a high concealing property as evident from the composition of the production example, so that the range in which two or more colors can be toned, that is, the so-called color reproduction width is limited. In order to freely perform toning, there is a problem that a large number of colored powders having different colors still need to be prepared, though not so much as in the past.

[0008]

Problems to be Solved by the Invention
No. 6 proposes to use a powder coating having high translucency mainly to make use of the gloss of the surface of the metal. It has been found that the use of an optical powder coating increases the color reproduction range, and there is a possibility that color mixing can be freely performed by mixing powder coatings of very few kinds of colors.

That is, a translucent powder paint of three primary colors, cyan, magenta and yellow, or a translucent powder paint of four colors of cyan, magenta and yellow with black added. One color alone or two or more colors
By mixing or laminating, for example, by coating on a white substrate and baking, it is possible to form a coating film of any color tone. In addition, if a translucent powder paint of each of the above colors or other colors is applied and baked on a pre-colored object to be coated, depending on the color and film thickness, etc., the delicate color tone of the preceding color tone can be obtained. Toning is possible.

However, the light-transmitting powder coating disclosed in the above prior art places too much emphasis on maintaining the texture of the metal as the base and improving the light-transmitting property therefor, so that 100 parts by weight of the resin is used. Because the colorant is 0.001 to 0.5 parts by weight and about 1/100 of the content ratio of the colorant in the ordinary powder coating, the color is thin and the problem that a vivid color cannot be obtained is caused. there were.

Further, if the content of the colorant is simply increased in order to make up for the above-mentioned drawbacks, the translucency is reduced, and the color reproducibility at the time of toning is reduced. Turns out to be problematic. An object of the present invention is to provide a light-transmitting powder coating material having a sufficient light-transmitting property capable of forming a deep color and vivid coloration, and not reducing color reproducibility when toning is performed. That is.

[0012]

In order to impart sufficient translucency to the above-mentioned translucent powder coatings of cyan, magenta and yellow, the inventors first disperse them in a resin. A good colorant is selected, and the amount of the colorant is adjusted so that the color is in a range in which the color is dark and vivid.
Various studies were made.

However, in a subsequent study, it was found that even if the type and the amount of the colorant were the same, the dispersibility was insufficient and a large amount of large aggregates of the colorant were present in the binder resin. It became clear that the color of the paint became darker, but the translucency was lowered, and the color reproducibility when toning was performed as described above was lowered. Therefore, the present inventors have found that the above three color translucent powder coatings can produce deep and vivid color development for each of the three color translucent powder coatings, and have sufficient transmissivity so that the color reproducibility does not decrease when toning is performed. As a result of studying the type and amount of the colorant capable of maintaining a light-emitting state, and the range of the dispersion state of the colorant, specifically, the size and the number of aggregates of the colorant, the present invention was examined. Was completed.

That is, the cyan translucent powder coating of the present invention is a translucent powder coating in which a phthalocyanine pigment as a coloring agent is dispersed in a transparent binder resin. The amount of the pigment is 1 to 20 parts by weight with respect to the weight part, and the thickness 1
[mu] m, the area 1,000,000μm present in the ^second coating film, 10 [mu] m ² or more, in the number of aggregates of a pigment having an area of less than 12.5 .mu.m ² is 120 or less, and 12.5
The pigment is dispersed in the binder resin such that the number of the pigment aggregates having an area of not less than μm ^{2 and not} more than 15 μm ² is 70 or less.

The magenta translucent powder coating of the present invention is a translucent powder coating in which a quinacridone pigment is dispersed as a coloring agent in a transparent binder resin. The amount of the pigment is 1 to 20 parts by weight with respect to the parts by weight, and a thickness of 1 μm formed from the powder coating material.
m, is present in the coating area 1,000,000μm ^2, 10μm ² or more, the number of aggregates of a pigment having an area of less than 12.5 .mu.m ² of 60 or less, and 12.5μ
The pigment is dispersed in the binder resin such that the number of pigment aggregates having an area of m ² or more and 15 μm ² or less is 30 or less.

Further, the yellow translucent powder paint of the present invention is a translucent powder paint obtained by dispersing an acetoacetic acid arylide azo pigment as a colorant in a transparent binder resin, When the amount of the pigment is 1 with respect to 100 parts by weight of the binder resin.
With a 20 parts by weight, was formed from the powder coating, thickness 1 [mu] m, is present in the coating area 1,000,000μm ^2, 10μm ² or more, the coagulation of the pigment having an area of less than 12.5 .mu.m ² The pigment was dispersed in the binder resin such that the number of aggregates was 35 or less, and the number of pigment aggregates having an area of 12.5 μm ² or more and 15 μm ² or less was 15 or less. It is a feature.

In order to regulate the size and the number of the colorant aggregates in the specific range as described above in the translucent powder coating of each color, the specific colorant is mixed with the specific compound as described above. The mixing may be performed within the range of the amount, and the mixing, melting, and kneading conditions in the production process may be adjusted. In addition, the lower limit of the number of aggregates in each translucent powder coating is the most preferable state in which the aggregates are not present and the colorant is dispersed in the binder resin at the molecular level. No 0
It is.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below. (Binder Resin) As the binder resin, among the various known resins used in powder coatings, it has excellent translucency and is melted by heating at the time of coating or after coating. Any of various resins capable of forming a continuous coating film can be used.

Examples of the binder resin include, but are not limited to, polystyrene, chloropolystyrene,
Poly-α-methylstyrene, styrene-chlorostyrene copolymer, styrene-propylene copolymer, styrene-
Butadiene copolymer, styrene-vinyl chloride copolymer,
Styrene-vinyl acetate copolymer, styrene-maleic acid copolymer, styrene-acrylate copolymer (styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer Copolymer, styrene-octyl acrylate copolymer, styrene-phenyl acrylate copolymer, etc.), styrene-methacrylate copolymer (styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene -Butyl methacrylate copolymer, styrene-phenyl methacrylate copolymer, etc.), styrene-α-
Styrene resins (homopolymers or copolymers containing styrene or styrene substituents) such as methyl chloroacrylate copolymer, styrene-acrylonitrile-acrylate copolymer, acrylic acid, methyl acrylate, ethyl acrylate Acrylic resins such as butyl acrylate, octyl acrylate, phenyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, butyl methacrylate, phenyl methacrylate, methyl α-chloroacrylate [(meth) acrylic acid and Homopolymer or copolymer based on the ester), polyvinyl chloride, low molecular weight polyethylene, low molecular weight polypropylene, ethylene-ethyl acrylate copolymer, polyvinyl butyral, ethylene-vinyl acetate copolymer, polyester resin, Epoki Resins, silicone resins, etc. These are used alone or in two or more.

Among the above, particularly preferred binder resins include styrene resins, acrylic resins and polyester resins. Among them, (i)
(1):

[0021]

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[Wherein R ¹ and R ² represent the same or different lower alkylene groups. x and y are the same or different and each represent 0 or an integer of 1 or more;
7 A diol component represented by: (ii) a dicarboxylic acid, an acid anhydride or a lower alkyl ester thereof,
(iii) Trihydric or higher polycarboxylic acid, its anhydride or lower alkyl ester, or copolycondensation with trihydric or higher polyhydric alcohol, and has a hydroxyl value (OHV) based on its acid value (AV). ) Ratio OHV / AV value is 1.
Two or more polyester resins are preferred binder resins.

In the above polyester resin, lower alkylene groups corresponding to R ¹ and R ² in the general formula (1) include, for example, methylene, ethylene, trimethylene, propylene, tetramethylene, ethylethylene, pentamethylene, hexamethylene. Examples thereof include an alkylene group having 1 to 6 carbon atoms such as methylene. X + y in the general formula (1) is 1 to 7 as described above, and preferably 3 to 5. x +
When y exceeds 7, the molecular weight of the diol component becomes too large, which causes a problem that the light transmittance of the coating film is reduced.

As the diol component represented by the general formula (1), for example, polyoxypropylene (2.2) -2,2
-Bis (4-hydroxyphenyl) propane, polyoxypropylene (3.3) -2,2-bis (4-hydroxyphenyl) propane, polyoxyethylene (2.0)
-2,2-bis (4-hydroxyphenyl) propane,
Polyoxypropylene (2) -polyoxyethylene (2) -2,2-bis (4-hydroxyphenyl) propane, polyoxypropylene (6.0) -2,2-bis (4-hydroxyphenyl) propane, etc. can give.

The dicarboxylic acids include, for example, oxalic acid, malonic acid, succinic acid, itaconic acid, glutaconic acid,
Examples include adipic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid, azelaic acid, sebacic acid, cyclohexanedicarboxylic acid, phthalic acid, isophthalic acid, terephthalic acid and the like. These dicarboxylic acids may be esters with acid anhydrides or lower alkyls. As lower alkyl, for example, methyl, ethyl, n-propyl,
Examples thereof include an alkyl group having 1 to 6 carbon atoms such as isopropyl, n-butyl, iso-butyl, s-butyl, t-butyl, n-pentyl and n-hexyl.

The polyhydric carboxylic acid having a valency of 3 or more, its anhydride or lower alkyl ester, and the polyhydric alcohol having a valency of 3 or more are used to adjust the acid value and the hydroxyl value of the polyester resin, It is blended for the purpose of. Examples of the trivalent or higher polycarboxylic acid, its acid anhydride or lower alkyl ester include trimellitic acid, 2,5,7-naphthalene tricarboxylic acid, 1,2,4-naphthalene tricarboxylic acid, 1,2,4- Butanetricarboxylic acid, 1,3-dicarboxyl-2-methyl-2-methoxycarbonylpropane, tetra (methoxycarbonyl) methane, 1,2,2
7,8-octanetetracarboxylic acid and the like.

Examples of the trihydric or higher polyhydric alcohol include glycerin, 2-methyl-1,2,3-propanetriol, 1,2,4-butanetriol and 2-methyl-1,2,4-butanetriol. , 1,2,5-pentatriol, pentaerythritol, dipentaerythritol, tripentaerythritol, hexitol, sorbitol, 1,4-sorbitan, 1,2,4-benzenetriol and the like.

The polyester resin is synthesized by copolycondensation of the above components at a temperature of 180 to 250 ° C., for example, in an inert gas atmosphere. Acid value of polyester resin (A
The ratio of the hydroxyl value (OHV) to V) OHV / AV is 1.2 or more, preferably 1.2 to 50, more preferably 2 to 40. OHV / AV value is 1.2
If it is less than 1, the translucency of the resin decreases, the minimum melting temperature of the resin increases, and it becomes difficult to form a continuous coating film by heating and melting, or the fluidity of the powder coating decreases. Problem.

The acid value (AV) is calculated, for example, by dissolving a polyester resin in a mixed solvent of benzene and ethanol, titrating with potassium hydroxide, and calculating the neutralization amount. The hydroxyl value (OHV) is determined by, for example, acetylating a free acid in a polyester resin using a mixed solvent of pyridine and acetic anhydride (3.1: 1), and then titrating acetic acid bound to the resin with potassium hydroxide. It is calculated from the amount of neutralization by titration.

The polyester resin described above can be used alone, or may be blended with the various resins known in the prior art. When other resins are blended, the amount is preferably about 1 to 30% by weight based on the polyester resin. (Colorant) As the cyan colorant, a phthalocyanine pigment is used as described above. Specific examples of such phthalocyanine pigments include, for example, those represented by the general formula (2):

[0031]

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Wherein X ¹ , X ² , X ³ and X ⁴ are the same or different and are each a hydrogen atom, a group (2a) or a group (2b):

[0033]

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Is shown. R ³ and R ⁴ are an alkylene group having 1 to 5 carbon atoms. A copper phthalocyanine pigment represented by, for example, C.I. I. Pigment Blue 15 (15: 1 to 15:
4), C.I. I. Pigment Blue 15 partially chlorinated product,
C. I. Pigment Blue 17, etc., or Formula (3):

[0035]

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And a metal-free phthalocyanine pigment (CI Pigment Blue 16). The blending amount of the phthalocyanine pigment is 1 to 20 parts by weight based on 100 parts by weight of the binder resin. When the amount of the phthalocyanine-based pigment is less than the above range, the color becomes thin and a clear color cannot be obtained. On the contrary, when the amount exceeds the above range, the light transmittance of the powder coating material is reduced. The amount of the phthalocyanine-based pigment to be added is within the above range.
It is preferably from 1 to 10 parts by weight, more preferably from 2 to 8 parts by weight, per 100 parts by weight.

In the present invention, a small amount of another cyan-based coloring agent may be used in combination with the above-mentioned phthalocyanine-based pigment within a range that does not affect the color development and light transmittance of the coating film. Examples of the other cyan colorants include inorganic pigments such as navy blue (Prussian blue) and cobalt blue; I. Pigment Blue 18, C.I. I. Organic pigments such as C.I. Pigment Blue 16, C.I. I. Bat Blue 6, C.I. I. And dyes such as Solvent Blue 70.

As the magenta coloring agent, a quinacridone pigment is used. Specific examples of such quinacridone pigments include, for example, those represented by the general formula (4):

[0039]

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Wherein Q ¹ and Q ² are the same or different and each represent a hydrogen atom, an alkyl group or an alkoxy group.
However, Q ¹ and Q ² are not simultaneously hydrogen atoms. Quinacridone pigments such as C.I. I. Pigment Red 122 and the like. The compounding amount of the quinacridone pigment is 1 to 20 parts by weight based on 100 parts by weight of the binder resin. When the amount of the quinacridone pigment is less than the above range, the color becomes light and a clear color cannot be obtained. On the contrary, when the amount exceeds the above range, the light transmittance of the powder coating material decreases. The amount of the quinacridone pigment is preferably in the above range, particularly preferably 1 to 10 parts by weight, more preferably 2 to 8 parts by weight, per 100 parts by weight of the binder resin.

In the present invention, a very small amount of another magenta colorant can be used in combination with the above-mentioned quinacridone pigment within a range that does not affect the color development and light transmittance of the coating film. As the other magenta-based coloring agents,
For example, inorganic pigments such as Bengala, cadmium red, lead red, cadmium mercury sulfide, manganese purple, red-mouthed graphite, and molybdenum orange; I. Pigment Red 3, C.I.
I. Pigment Red 38, C.I. I. Pigment Red 48: 2, C.I. I. Pigment Red 49: 1, C.I.
I. Pigment Red 49: 2, C.I. I. Pigment Red 50, C.I. I. Pigment Red 57, C.I. I. Pigment Red 60, C.I. I. Pigment Red 81,
C. I. Pigment Red 90, Permanent Red F
NG, C.I. I. Pigment Violet 3, C.I. I. Pigment Violet 25, C.I. I. Pigment Orange 5, C.I. I. Pigment Orange 13, C.I. I. Organic pigments such as CI Pigment Orange 16, dyes such as Spiron Red, Indanthrene Brilliant Orange RK, and Indanthrene Brilliant Orange GK.

As a yellow colorant, an acetoacetic arylide azo pigment is used. Specific examples of such acetoacetic acid arylide azo pigments include, for example, those represented by the general formula
(Five) :

[0043]

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[In the formula, R ⁵ represents an alkyl group, an alkoxy group or a nitro group, and R ⁶ represents a halogen atom, an alkyl group, an alkoxy group, a carboxy group, a nitro group, a sulfamoyl group substituted with an aromatic group, or a Ca group. , Ba, M
It represents a sulfo group substituted with a metal such as n or Sr. R ⁷ ,
R ⁸ , R ⁹ and R ¹⁰ are the same or different and each represent a hydrogen atom,
It represents a halogen atom, an alkyl group or an alkoxy group. An acetoacetic acid arylide-based monoazo pigment represented by
For example, C.I. I. Pigment Yellow 1, C.I. I. Pigment Yellow 3, C.I. I. Pigment Yellow 65,
C. I. Pigment yellow 73, C.I. I. Pigment yellow 74, C.I. I. Pigment Yellow 97, C.I.
I. Pigment Yellow 98, C.I. I. Pigment Yellow 130, C.I. I. Pigment yellow 133, C.I.
I. Pigment Yellow 169, etc., or a general formula
(6):

[0045]

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[Wherein, R ¹¹ represents a hydrogen atom, an alkyl group or an alkoxy group, R ¹² represents a hydrogen atom, a halogen atom or an alkyl group, and R ¹³ represents a hydrogen atom or an alkoxy group. Acetoacetic acid arylide disazo pigments represented by the following formulas: I. Pigment Yellow 12,
C. I. Pigment Yellow 13, C.I. I. Pigment Yellow 17, C.I. I. Pigment yellow 55, C.I.
I. Pigment Yellow 83 and the like.

The compounding amount of the acetoacetic arylide azo pigment is 1 to 20 parts by weight based on 100 parts by weight of the binder resin. If the amount of the acetoacetate arylide-based azo pigment is less than the above range, the color may become light and a clear color may not be obtained. Conversely, if the amount exceeds the above range, the transparency of the powder coating may be reduced. Light properties may be reduced. The compounding amount of the acetoacetate arylide-based azo pigment is preferably in the above range, particularly preferably 1 to 10 parts by weight, more preferably 1.5 to 8 parts by weight based on 100 parts by weight of the binder resin. preferable.

In the present invention, a small amount of another yellow-based coloring agent may be used in combination with the above-mentioned acetoacetic acid arylide-based azo pigment in a range that does not affect the coloration and light transmittance of the coating film. it can. Examples of the other yellow-based coloring agents include inorganic pigments such as yellow iron oxide, loess, graphite, zinc yellow, cadmium yellow, and antimony yellow; I. Pigment Yellow 16, C.I. I. Pigment yellow 138, C.I. I. Pigment Yellow 1
Organic pigments such as C.15; I. Solvent Yellow 16,
C. I. Solvent Yellow 33, C.I. I. Solvent Yellow 56, C.I. I. Solvent Yellow 60, C.I.
I. Solvent Yellow 61, C.I. I. Solvent Yellow 162, C.I. I. Acid Yellow 1, C.I. I. Dyes such as Acid Yellow 23;

(Other Additives) In addition to the above components, the three-color translucent powder coating material of the present invention further comprises a charge control agent, a curing agent, a smoothing agent (flowing agent) and the like. Various conventionally known additives may be blended. Among the above, the charge control agent, when using the translucent powder coating, for example, the electrostatic coating method or the electrostatic flow immersion method described above, to improve the charge amount,
In addition, it is for stabilizing regardless of changes in environmental conditions such as temperature and humidity, and one of a positive charge control agent and a negative charge control agent is used in accordance with the charging polarity of the powder coating material.

Examples of the positive charge control agent include a nigrosine electron donating dye, a metal salt of naphthenic acid or a higher fatty acid, an alkoxylated amine, a quaternary ammonium salt, an alkyl amide, a chelate, a pigment, and a fluorine treatment. Activators and the like. Examples of charge control agents for controlling negative charges include electron-accepting organic complexes, chlorinated paraffins, chlorinated polyesters, polyesters having an excess of acid groups, sulfonylamine of copper phthalocyanine, aromatic oxycarboxylic acids, and aromatic dicarboxylic acids. Acids and the like.

However, in the case of a translucent powder coating, in order to have as little influence as possible on its color, (a) it is colorless or pale in itself, and (b) it is bound so that the powder coating does not become cloudy. A charge controlling agent which is excellent in compatibility with the resin or incompatible with the binder resin but excellent in dispersibility is preferably used.

The positive charge controlling agent satisfying the above conditions includes a quaternary ammonium salt among the above, and the negative charge controlling agent includes an aromatic oxycarboxylic acid, an aromatic dicarboxylic acid and the like. Among the above, the quaternary ammonium salt which is a positive charge control agent includes various compounds, and in particular, the compound represented by the general formula (7):

[0053]

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Wherein R ^a , R ^b , R ^c and R ^d are
Same or different lower alkyl group, long chain alkyl group,
A represents an alkenyl group or a benzyl group, and A ^- represents an anion. However, at least one of R ^{a to} R ^d is a long-chain alkyl group or a long-chain alkenyl group, and two are a lower alkyl group or a benzyl group. ] Are preferably used.

In the general formula (7), examples of the long-chain alkyl group corresponding to R ^{a to} R ^d include an octyl group,
Decyl group, dodecyl group, tetradecyl group, hexadecyl group, octadecyl group, eicosyl group, docosyl group, oleyl group, linolyl group, hexadecyl group, etc. Examples of the long-chain alkenyl group include, for example, a group having one or more double bonds introduced into the molecule of the long-chain alkyl group.

[0056] A ^- as the anion represented by, for example, molybdate, phosphomolybdic acid, silicomolybdic acid, chromium molybdate, bromine, molybdate, tungstate, phosphotungstic acid, silicotungstic acid, chromium, tungsten Anions, chloride ions, bromine ions, iodine ions, nitrate ions, sulfate ions derived from molybdenum atoms and inorganic acids containing tungsten atoms such as acids, bromotungstic acid, phosphotungsten / molybdic acid, and silicotungsten / molybdic acid , Perchlorate ion, benzoate ion, tetraphenylboron ion, hexafluorophosphate ion, naphtholsulfonate ion and the like.

Specific examples of the quaternary ammonium salt represented by the general formula (7) include, for example, (C ₁₆ H ₃₃ ) ₂ N ⁺
(CH ₃ ) ₂ 1/4 Mo ₈ O ₂₆ ^4- , (C ₁₆ H ₃₃ ) ₂
N ⁺ (CH ₃ ) ₂ 1/6 Mo ₇ O ₂₄ ^6- , (C
^{_{16 H 33) 2 N + (}} CH 3) 2 · 1 / 2WO 4 2- and the like, may be used by mixing one or more of them.

The charge control agent is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the binder resin.
More preferably, it is 5 parts by weight. If the amount of the charge control agent is less than the above range, the effect of the addition may be insufficient.If the amount exceeds the above range, the light transmittance may decrease or the color may change. There is a possibility that. The curing agent is for curing the coating film by crosslinking the binder resin in the coating film when the light-transmitting powder coating material is heated and melted to form a coating film. Examples of the agent include a blocked isocyanate, an epoxy resin, an amino resin, an aziridine compound, and a polycarboxylic acid.

A suitable range of the curing agent is set according to the equivalent of the functional group contributing to the curing reaction. If the amount of the curing agent is less than the preferred range, the effect of the addition may be insufficient.If the amount exceeds the preferred range, on the other hand, the light transmittance is reduced or the color is changed. Or The leveling agent is used to improve the fluidity of the translucent powder coating when heated and melted to make the coating film smoother. As such a leveling agent, for example, trade name “BASF” Acronal 4F ", a product name" YF-3919 "manufactured by Toshiba Silicone Co., Ltd., and a product name" Modaflow 2000 "manufactured by Monsanto Co., Ltd.

The blending amount of the leveling agent is preferably 0.1 to 2 parts by weight based on 100 parts by weight of the binder resin.
More preferably, the amount is from 1 to 1 part by weight. If the blending amount of the leveling agent is less than the above range, the effect of the addition may be insufficient, and if it exceeds the above range, the translucency is reduced or the color is changed. There is a risk. As described above, the three-color translucent powder coating of the present invention is
When used for toning with a black translucent powder coating, the charging characteristics of a black translucent powder coating using conductive carbon black and the above three color translucent powder coatings In order to match, the transparent conductive fine powder may be contained in each of the three color translucent powder coatings. Such a transparent conductive fine powder has an aspect ratio (major axis length /
Thickness) is preferably 30 or more and the thickness is about 0.1 μm or less.

The blending amount of the transparent conductive fine powder may be appropriately set in accordance with the charging characteristics of the light transmitting powder coating. The carbon black to be contained in the black light-transmitting powder coating material is selected from the group consisting of a black light-transmitting powder coating material and a three-color light-transmitting powder coating material of the present invention. , As carbon black, volatile matter 4% or more,
Structure index of 100 or more and average particle size of 20 to
It is preferable to use one having a thickness of 35 nm.

(Method for Producing Translucent Powder Coating) Each of the three color translucent powder coatings of the present invention is a mixture obtained by premixing the above components using a dry blender, Henschel mixer, ball mill or the like. For example, after melt-kneading using a jet mill, a Banbury mixer, a roll, a single-screw or twin-screw extrusion kneader, the obtained kneaded material is cooled, pulverized, and, if necessary, classified. Is done.

In addition, it can also be produced by a polymerization method, a microcapsule polymerization method, a spray drying method, or the like. In this case, by adjusting the mixing, melting, and kneading conditions in the manufacturing process as described above, the size and the number of the colorant aggregates in the transparent powder coating material of each color are in the specific range described above. Is defined within.

[0064] Specifically, in the translucent powder coating of cyan has a thickness 1 [mu] m, is present in the coating area 1,000,000μm ^2, 10μm ² or more, a colorant having an area of less than 12.5 .mu.m ² The number of aggregates is 120 or less, and 12.5 μm ² or more, the number of colorant aggregates having an area of 15 μm ² or less is defined as 70 or less,
In a magenta-based translucent powder coating, 10 μm ² or more and 12.5 μm are present in a coating film of the same size as above.
The number of colorant aggregates having an area of less than m ² is 60 or less, and the number of colorant aggregates having an area of 12.5 μm ² or more and 15 μm ² or less is defined as 30 or less, and yellow In translucent powder coatings of the type, 10 μm ² or more, which is present in a coating film of the same size as described above.
The number of colorant aggregates having an area of less than 5 μm ² is 3
The number of colorant aggregates having an area of 5 or less and having an area of 12.5 μm ² or more and 15 μm ² or less is defined as 15 or less.

When the number of aggregates of each size exceeds the above-mentioned range, the translucency of any of the translucent powder coating materials is reduced, and the color when the toning is performed is reduced. Color reproducibility decreases. Note the translucent powder coating of cyan, 10 [mu] m ² or more, the number of the aggregate of the colorant having an area of less than 12.5 .mu.m ^2, especially also in the range described above, is preferably 100 or less, More preferably, the number is 80 or less. In addition, 12.5 μm ² or more, 15
The number of colorant aggregates having an area of μm ² or less is preferably within the above-mentioned range, particularly preferably 50 or less, and more preferably 40 or less.

[0066] Also in the light-transmitting powder coating of magenta, 10 [mu] m ² or more, the number of the aggregate of the colorant having an area of less than 12.5 .mu.m ^2, especially also in the range described above, it's 50 or less Is preferable, and it is more preferable that the number is 40 or less. 12.5 μm ² or more, 15 μm
The number of colorant aggregates having an area of m ² or less is preferably within the above-mentioned range, particularly preferably 25 or less, and more preferably 20 or less.

Further, in a yellow translucent powder coating,
10 μm^Two12.5 μm ^TwoHas an area of less than
The number of the colorant aggregates within the range described above is particularly preferable.
Is preferably 30 or less, and 25 or less
Is more preferred. 12.5 μm^TwoAbove, 15μ
m^TwoThe number of colorant aggregates having the following areas
In particular, it is preferable that the number is 12 or less.
More preferably, the number is 10 or less.

In the present invention, it is basically preferable that no larger aggregates of the coloring agent having an area exceeding 15 μm ² be contained at all. In the case of a magenta-based translucent powder coating, the number of the aggregates may be 10 or less, and in the case of a yellow-based translucent powder coating, the number of the aggregates may be 5 or less.

The particle size of the light-transmitting powder coating may be the same as that of the conventional one, but the smaller the particle size is, the more preferable it is in view of the uniformity of the color when two or more colors are mixed. Is preferably 30 μm or less. In consideration of the chargeability, the ease of forming a coating film, the difficulty of aggregation, and the like, the average particle size of the light-transmitting powder coating material is particularly 1 μm within the above range.
It is preferable that this is the case.

In consideration of the balance between the above properties, the average particle size of the translucent powder coating is particularly preferably 5 to 20 μm within the above range. In order to improve the fluidity and charging characteristics of the translucent powder coating,
Various external additives may be added. As the above external additives,
Various conventionally known external additives having a particle size of about 1.0 μm or less, for example, fine powders of metal oxides such as aluminum oxide, silicon oxide, titanium oxide, and zinc oxide, or fine particles of fluororesin can be used. Particularly, silica-based surface treatment agents containing hydrophobic or hydrophilic silica fine particles, for example, ultrafine anhydrous silica and colloidal silica are preferably used.

The amount of the external additive to be added is not particularly limited, and may be about the same as the conventional one. Specifically, it is preferable to add an external additive in a total amount of about 0.1 to 3.0 parts by weight based on 100 parts by weight of the light-transmitting powder coating material. May be out of this range.

[0072]

The present invention will be described below based on examples and comparative examples. (Preparation of Polyester Resin) Reference Example Polyoxypropylene (2.2) -2,2-bis (4-
Hydroxyphenyl) propane [a diol component in which R ¹ and R ² in the general formula (1) are both trimethylene and both X and Y are 2] 840 g, polyoxyethylene- (2.0) -2,2- Bis (4-hydroxyphenyl) propane [a diol component in which both R ¹ and R ² in the general formula (1) are ethylene, X is 2 and Y is 0]
195 g, terephthalic acid 29 g, di-n-butyltin oxide (stabilizer) 2 g and hydroquinone 1.5 g
The mixture was placed in a liter flask and subjected to copolycondensation at 200 ° C. with stirring. The reaction is performed according to ASTM E 28-51T.
When the softening point reached 122 ° C., the process was terminated.

The obtained polyester resin was a pale yellow solid, had a glass transition temperature of 66 ° C. by DSC (differential calorimetry), an acid value (AV) of 14 KOH mg / g, and a hydroxyl value (OHV) of 36 KOH mg / g. , And OHV / AV
= 2.57. (Production of Translucent Cyan Powder Coating) Example 1 The following components were mixed for 5 minutes using a Henschel mixer.
Pre-mixed, then extruded kneader (Ikegai Co., Ltd. "PC
M-30 ”), the kneading temperature is 110 ° C., and the number of shaft rotation is 20.
After melt-kneading under kneading conditions of 0 rpm, the obtained kneaded material was cooled and pulverized.

(Component) (parts by weight) Binder resin Polyester resin obtained in the above reference example 100 Colorant Non-metallic phthalocyanine pigment C.I. I. Pigment Blue 16 5 ・ Curing agent Isocyanate 18 ・ Smoothing agent Acronal 4F 1 described above. Then, the above pulverized material is classified using a 150-mesh sieve to obtain a cyan-based translucent powder coating material having an average particle size of 12 μm. Manufactured.

Example 2 The following components were mixed for 5 minutes using a Henschel mixer.
The mixture was preliminarily mixed and then melt-kneaded at the kneading temperature of 110 ° C. and the shaft rotation speed of 200 rpm using the same extrusion kneader as described above, and the obtained kneaded material was cooled and pulverized. (Components) (parts by weight) Binder resin Acrylic resin 100 [trade name “Almatex PD7210” manufactured by Mitsui Toatsu Chemicals, Inc.] Colorant Non-metallic phthalocyanine pigment C.I. I. Pigment Blue 16 4 ・ Curing agent Dodecane diacid 20 ・ Smoothing agent Acronal 4F 1 described above Then, the above pulverized material is classified using a 150-mesh sieve, and cyan-based translucent powder having an average particle diameter of 12 μm. A paint was manufactured.

Example 3 I. Pigment Blue 16 was added in an amount of 15 parts by weight, and the kneading conditions were a kneading temperature of 95 ° C and a shaft rotation speed of 2 parts.
A cyan translucent powder coating material having an average particle size of 12 μm was produced in the same manner as in Example 1 except that the rotation speed was changed to 00 rpm. Comparative Example 1 Melt kneading conditions were as follows: kneading temperature 130 ° C., shaft rotation speed 280 rpm
m in the same manner as in Example 1 except that
A 2 μm cyan translucent powder coating material was produced.

Comparative Example 2 A cyan translucent powder having an average particle size of 12 μm was prepared in the same manner as in Example 1 except that the same amount of a sulene pigment (CI Pigment Blue 60) was used as the colorant. A paint was manufactured. Comparative Example 3 C.I. I. Pigment Blue 16 in the same manner as in Example 1 except that the blending amount was 0.1 part by weight.
A μm cyan translucent powder coating material was produced.

The following tests were performed on the cyan translucent powder coating materials of the above Examples and Comparative Examples to evaluate the characteristics. Evaluation of Dispersibility of Pigment The cyan-based translucent powder coating material of each of Examples and Comparative Examples was sandwiched between two glass plates, heated at 110 ° C. for 1 minute while being compressed, and melted to obtain a 1.0 μm thick film. A sample of the coating was formed. And the area 1,000,000μ near the center
A micrograph of the area of m ² was taken and 1
The number of colorant aggregates having an area of 0 μm ² or more and less than 12.5 μm ² , and 12.5 μm ² or more and 15 μm
The number of colorant aggregates having an area of m ² or less was counted.

Transmittance Measurement I The wavelengths of 490 nm and 600 nm of the samples of the coating films of the examples and comparative examples produced by the above-mentioned evaluation of the dispersibility of the pigment.
Was measured using a spectrophotometer. Light transmission evaluation I The spectrum of the sample of the coating film was measured using a spectrophotometer, and 400 to 500 n when the maximum transmittance of light in the wavelength region of 550 to 700 nm was set to 2%.
When the maximum transmittance in the wavelength region of m is 40% or more,
(Good translucency) and those not satisfying the above conditions were evaluated as x (poor translucency).

Evaluation I of Color Reproducibility I The cyan-based translucent powder coating material of each of the examples and comparative examples was prepared by using the same binder resin as used in each of the examples and comparative examples. When the film is mixed with the translucent powder paint of the above at an arbitrary ratio to form a coating film, the coating film with a wide reproduction range of hue, saturation, and lightness is marked with ○ (good color reproducibility). A sample having a small degree of reproduction of brightness and lightness was evaluated as x (poor color reproducibility).

Evaluation of Appearance of Coating Film The appearance of the coating film formed of the cyan-based translucent powder coating material of each of Examples and Comparative Examples was visually evaluated. Tables 1 and 2 show the above results.

[0082]

[Table 1]

[0083]

[Table 2]

As is clear from the above table, all of the cyan-based translucent powder coating compositions of the respective examples had different kneading conditions so that the number of aggregates of the phthalocyanine-based pigment exceeded a specific range. 1 or a pigment other than a phthalocyanine-based pigment is used, so that the number of agglomerates of the pigment exceeds a specific range, and the transparency, color reproducibility, and appearance of the coating film are superior to Comparative Example 2. I understand.

Further, all of the cyan-based translucent powder coatings of the above-described examples are superior in color reproducibility and appearance of the coating film as compared with Comparative Example 3 in which the amount of the phthalocyanine-based pigment is too small. I also understood. Further comparing the respective examples, the cyan-based translucent powder coating material of Example 3 is excellent in translucency, color reproducibility and appearance of a coating film, but has a low kneading temperature, so that an extruder is used. It was found that the load applied to the device was so large that it was not suitable for continuous operation, that is, it was somewhat difficult to use in terms of mass productivity.

On the other hand, the cyan-based translucent powder coatings of Examples 1 and 2 have excellent translucency, color reproducibility and appearance of the coating film, and are also extruded and kneaded because of the high kneading temperature. It was found that the load on the machine was small, suitable for continuous operation, and excellent in mass productivity. (Production of Translucent Magenta Powder Coating) Example 4 The following components were mixed for 5 minutes using a Henschel mixer.
The mixture was preliminarily mixed and then melt-kneaded at the kneading temperature of 110 ° C. and the shaft rotation speed of 200 rpm using the same extrusion kneader as described above, and the obtained kneaded material was cooled and pulverized.

(Component) (parts by weight) Binder resin Polyester resin 100 obtained in the above reference example 100 Colorant A quinacridone-based pigment I. Pigment Red 122 5 ・ Curing agent Isocyanate 18 ・ Smoothing agent Acronal 4F 1 described above. Then, the above-mentioned pulverized material is classified using a 150-mesh sieve to obtain a magenta translucent powder coating material having an average particle size of 12 μm. Manufactured.

Example 5 The following components were mixed for 5 minutes using a Henschel mixer.
The mixture was preliminarily mixed, and then melt-kneaded using the same extrusion kneader at a kneading temperature of 110 ° C. and a shaft rotation speed of 200 rpm, and the obtained kneaded material was cooled and pulverized. (Components) (parts by weight) Binder resin Acrylic resin 100 [trade name “Almatex PD7210” manufactured by Mitsui Toatsu Chemicals, Inc.] Colorant A quinacridone pigment C.I. I. Pigment Red 122 4 ・ Curing agent Dodecane diacid 20 ・ Smoothing agent Acronal 4F 1 as described above. A paint was manufactured.

Example 6 C.I. I. Pigment Red 122 was 15 parts by weight, and the kneading conditions were the same as in Example 4, except that the kneading temperature was 95 ° C. and the shaft rotation speed was 200 rpm.
A magenta translucent powder coating material having an average particle size of 12 μm was produced. Comparative Example 4 Melt kneading conditions were as follows: kneading temperature: 130 ° C., shaft rotation speed: 280 rpm
m in the same manner as in Example 4, except that
A 2 μm magenta translucent powder coating was produced.

Comparative Example 5 A magenta translucent powder having an average particle diameter of 12 μm was prepared in the same manner as in Example 4 except that the same amount of an azo lake pigment (CI Pigment Red 57) was used as a coloring agent. A paint was manufactured. Comparative Example 6 C.I. I. Pigment Red 122 in the same manner as in Example 4 except that the blending amount was 0.1 part by weight.
A 2 μm magenta translucent powder coating was produced.

The magenta-based translucent powder coatings of the above Examples and Comparative Examples were subjected to the above-described evaluation of the dispersibility of the pigment, the evaluation of the appearance of the coating film, and the following tests. evaluated. Transmittance measurement II Wavelengths of 440 nm and 550 nm in the samples of the coating films of Examples and Comparative Examples produced in the evaluation of the dispersibility of the pigment.
And the spectral transmittance of light at 700 nm was measured using a spectrophotometer.

Light transmission evaluation II The spectral spectrum of the sample of the coating film was measured using a spectrophotometer, and the transmittance of light having a wavelength of 550 nm was 2%.
When the maximum transmittance in the wavelength region of 400 to 500 nm is 25% or more and the maximum transmittance in the wavelength region of 600 to 700 nm is 50% or more, Those that did not satisfy either one of the above conditions were evaluated as x (poor light transmission).

Evaluation of Color Reproducibility II Each of the magenta translucent powder coatings of Examples and Comparative Examples was prepared by using the same binder resin as used in each Example and Comparative Example. When the film is mixed with the translucent powder paint of the above at an arbitrary ratio to form a coating film, the coating film with a wide reproduction range of hue, saturation, and lightness is marked with ○ (good color reproducibility). A sample having a small degree of reproduction of brightness and lightness was evaluated as x (poor color reproducibility). Tables 3 and 4 show the above results.

[0094]

[Table 3]

[0095]

[Table 4]

As is clear from the above table, all the magenta-based translucent powder coating compositions of the respective examples have different kneading conditions so that the number of aggregates of quinacridone-based pigments exceeds a specific range. 4 or the use of pigments other than quinacridone-based pigments provides superior light transmission, color reproducibility, and appearance of the coating film as compared with Comparative Example 5 in which the number of the pigment aggregates exceeds a specific range. I understand.

Further, all of the magenta-based translucent powder coatings of each of the above Examples are superior in color reproducibility and appearance of the coating film as compared with Comparative Example 6 in which the amount of the quinacridone-based pigment is too small. I also understood. Further comparing the examples, the magenta-based translucent powder coating material of the example 6 shows the translucent,
Although excellent in color reproducibility and appearance of the coating film, the temperature at the time of kneading was low, so that the load on the extrusion kneader was large and unsuitable for continuous operation. In other words, it was found that it was somewhat difficult to use in terms of mass productivity.

On the other hand, the magenta translucent powder coatings of Examples 4 and 5 have excellent translucency, color reproducibility and appearance of the coating film, and are extruded and kneaded because of the high kneading temperature. It was found that the load on the machine was small, suitable for continuous operation, and excellent in mass productivity. (Production of translucent yellow powder coating material) Example 7 The following components were mixed for 5 minutes using a Henschel mixer.
The mixture was preliminarily mixed and then melt-kneaded at the kneading temperature of 110 ° C. and the shaft rotation speed of 200 rpm using the same extrusion kneader as described above, and the obtained kneaded material was cooled and pulverized.

(Component) (parts by weight) Binder resin Polyester resin 100 obtained in the above reference example 100 Colorant An acetoacetic arylide monoazo pigment. I. Pigment Yellow 74 2 ・ Curing agent Isocyanate 18 ・ Smoothing agent Acronal 4F 1 as described above. Then, the above-mentioned pulverized material is classified using a 150-mesh sieve, and a yellow-based translucent powder coating material having an average particle diameter of 12 μm. Was manufactured.

Example 8 The following components were mixed for 5 minutes using a Henschel mixer.
The mixture was preliminarily mixed and then melt-kneaded at the kneading temperature of 110 ° C. and the shaft rotation speed of 200 rpm using the same extrusion kneader as described above, and the obtained kneaded material was cooled and pulverized. (Components) (parts by weight) Binder resin Acrylic resin 100 (trade name “Almatex PD7210” manufactured by Mitsui Toatsu Chemicals, Inc.) Colorant C.I. I. Pigment Yellow 74 1.5 ・ Curing agent Dodecane diacid 20 ・ Smoothing agent Acronal 4F 1 described above Then, the above pulverized material was classified using a 150-mesh sieve to give a yellow translucent material having an average particle size of 12 μm. A powder coating was produced.

Embodiment 9 C.I. I. Pigment Yellow 74 was 12 parts by weight, and the kneading conditions were the same as in Example 7, except that the kneading temperature was 95 ° C. and the shaft rotation speed was 200 rpm.
A yellow translucent powder coating material having an average particle size of 12 μm was produced. Comparative Example 7 Melt-kneading conditions were as follows: kneading temperature: 130 ° C., shaft rotation speed: 280 rpm
m in the same manner as in Example 7 except that
A 2 μm yellow translucent powder paint was produced.

Comparative Example 8 A yellow translucent powder having an average particle diameter of 12 μm was prepared in the same manner as in Example 7, except that the same amount of a quinophthalone pigment (CI Pigment Yellow 138) was used as the colorant. A paint was manufactured. Comparative Example 9 C.I. I. Pigment Yellow 74 in the same manner as in Example 7 except that the blending amount was 0.1 part by weight.
A 2 μm yellow translucent powder paint was produced.

With respect to the yellow translucent powder coating materials of the above Examples and Comparative Examples, the evaluation of the dispersibility of the pigment, the evaluation of the appearance of the coating film, and the following tests were performed, and the characteristics were evaluated. evaluated. Transmittance measurement III Wavelengths of 400 nm and 550 nm in the coating film samples of the examples and the comparative examples prepared in the above-described pigment dispersibility evaluation.
Was measured using a spectrophotometer.

Light transmission evaluation III The spectral spectrum of the sample of the coating film was measured using a spectrophotometer, and when the maximum transmittance of light in the wavelength region of 400 to 500 nm was set to 2%, 550 was measured. ~ 700n
When the maximum transmittance in the wavelength region of m is 50% or more,
(Good translucency) and those not satisfying the above conditions were evaluated as x (poor translucency).

Evaluation of Color Reproducibility III Each of the yellowish translucent powder coatings of the examples and comparative examples was prepared by using the same binder resin as used in the examples and comparative examples. When the film is mixed with the translucent powder paint of the above at an arbitrary ratio to form a coating film, the coating film with a wide reproduction range of hue, saturation, and lightness is marked with ○ (good color reproducibility). A sample having a small degree of reproduction of brightness and lightness was evaluated as x (poor color reproducibility).

Tables 5 and 6 show the above results.

[0107]

[Table 5]

[0108]

[Table 6]

As is clear from the above table, in all of the yellow translucent powder coatings of the examples, the number of aggregates of the acetoacetic arylide azo pigment exceeded the specified range because the kneading conditions were different. Since Comparative Example 7 or a pigment other than the acetoacetic arylide-based azo pigment was used, compared to Comparative Example 8 in which the number of aggregates of the pigment exceeded a specific range, light transmission, color reproducibility and It was found that the appearance of the coating film was excellent.

Further, all of the yellow translucent powder coatings of each of the above Examples had better color reproducibility and appearance of the coating film than Comparative Example 9 in which the blending amount of the acetoacetic arylide azo pigment was too small. I also found it to be excellent. Further comparing the examples, the yellow translucent powder coating of Example 9 is
Although excellent in translucency, color reproducibility and appearance of coating film,
It was found that since the temperature at the time of kneading was low, the load on the extrusion kneader was large and was not suitable for continuous operation, that is, it was somewhat difficult to use in terms of mass productivity.

On the other hand, the yellow translucent powder coatings of Examples 7 and 8 are excellent in translucency, color reproducibility and appearance of the coating film, and are extruded and kneaded because of the high kneading temperature. It was found that the load on the machine was small, suitable for continuous operation, and excellent in mass productivity.

[0112]

As described above in detail, according to the present invention, it is possible to form a vivid color with a strong color tone, and to have a sufficient translucency that does not lower the color reproducibility when toning is performed. It is possible to provide a light-transmitting powder coating material having excellent properties.

Claims (3)

[Claims] 1. A translucent powder coating in which a phthalocyanine pigment is dispersed as a colorant in a transparent binder resin,
The amount of the pigment is 1 to 20 based on 100 parts by weight of the binder resin.
With parts by weight, was formed from the powder coating, thickness 1 [mu] m, is present in the coating area 1,000,000μm ^2, 10μm ² or more, of the aggregate of the pigment having an area of less than 12.5 .mu.m ² The number is 120 or less and 1
A translucent powder coating material comprising a pigment dispersed in a binder resin such that the number of pigment aggregates having an area of 2.5 μm ² or more and 15 μm ² or less is 70 or less. 2. A quinac as a colorant in a transparent binder resin.
A translucent powder coating in which a lidone pigment is dispersed.
The compounding amount of the pigment is from 1 to 20 parts by weight based on 100 parts by weight of the resin
Parts and the thickness formed from the powder coating.
1 μm, area 1,000,000 μm^TwoPresent in the paint film
10 μm^Two12.5 μm^TwoLess than
The number of aggregates of the pigment to be produced is 60 or less, and 12.5
μm^TwoAbove, 15 μm ^TwoAggregation of pigments with the following areas
Pigment in the binder resin so that the number of bodies is 30 or less
A light-transmitting powder coating material characterized by having dispersed therein. 3. A light-transmitting powder coating material in which an azo acetoacetate azo pigment is dispersed as a colorant in a transparent binder resin, wherein the amount of the pigment is 1 to 100 parts by weight of the binder resin. with a 20 parts by weight, was formed from the powder coating, thickness 1 [mu] m, is present in the coating area 1,000,000μm ^2, 10μm ² or more, the coagulation of the pigment having an area of less than 12.5 .mu.m ² If the number of aggregates is 35 or less,
And a pigment dispersed in the binder resin such that the number of pigment aggregates having an area of 12.5 μm ² or more and 15 μm ² or less is 15 or less. .