JPH06220370A - Coating composition - Google Patents

Abstract

PURPOSE:To obtain a coating composition, capable of imparting diversification of films such as color coating or decorativeness, especially a change in texture of the films and forming the films with suppressed clouding of hue and excellent in masking properties. CONSTITUTION:This coating composition is obtained by mixing iron oxide particles having 4-25mum plate surface diameter, 0.16-5mum thickness and 5-25 flakiness ratio with one or two or more pigments selected from a color pigment, a mica pigment and a metallic powder pigment in an organic solvent containing a film-forming polymer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition which is useful for protection and decoration of automobiles, motorcycles and the like.

[0002]

2. Description of the Related Art Coatings for automobiles and motorcycles can be roughly classified into solid paints and metallic paints. Solid paints include inorganic pigments such as titanium oxide pigments and iron oxide pigments, copper phthalocyanine pigments, quinacridone pigments, The coating color is designed by mixing a coloring pigment such as an organic pigment having excellent weather resistance such as a perylene pigment. In addition, metallic powders such as aluminum and mica pigments are usually used in combination with the above-mentioned coloring pigments for the purpose of giving a bright feeling to the paint for metallic coating.

A coating film formed by using the above solid paint or metallic paint is required to have sufficient durability and decorativeness (aesthetics) for protecting the base. In particular, reflecting the needs for individuality in recent years, there is a strong demand for diversification of coating film such as coating color of top coat and decorativeness (aesthetics). In particular, a coating composition that forms a coating film that changes texture There is a strong demand for things.

Iron oxide particle powder, which is a typical color pigment, has been widely used in various forms such as granular, spindle-shaped, and plate-shaped particles. Particularly, plate-shaped iron oxide has a luster and is used for coating compositions. Various attempts have been made to use it as a material.
(Japanese Patent Publication No. 63-41853, Japanese Patent Publication No. 60-897)
No. 7, Japanese Patent Publication No. 3-52413, Japanese Patent Laid-Open No. 61-
174120).

[0005]

The coating composition which diversifies the coating film such as coating color and decorativeness, and in particular changes the texture of the coating film, is the most demanded at present, but the above-mentioned known ones. The coating composition obtained by using iron oxide particles does not sufficiently meet these requirements. For this reason, transparent pigments such as transparent iron oxide pigments, copper phthalocyanine pigments, quinacridone pigments, and perylene pigments having high transparency (low hiding power) are used regardless of whether they are solid paints or metallic paints. On the other hand, in this case, there arises a problem that the hiding property of the coating film is lowered. Therefore, in order to improve the hiding property, as a current countermeasure, the concentration of the pigment in the coating film is increased, the film thickness of the coating film is increased, and a high concealing pigment is used in combination.
However, these measures cannot be said to be preferable from the viewpoint of the physical properties of the coating film, and in particular, a new problem of turbidity of hue due to the combined use of a high hiding pigment has been pointed out.

Therefore, according to the present invention, it is possible to diversify the coating film such as coating color and decorativeness, and in particular, to change the texture of the coating film, and further, it is excellent in the concealing property and the haze of the hue is suppressed. A technical object is to obtain a coating composition that forms a coating film.

[0007]

The above technical problems can be achieved by the present invention as follows. That is, the present invention is
A plate-shaped iron oxide particle having a plate surface diameter of 4 to 25 μm, a thickness of 0.16 to 5 μm and a plate ratio of 5 to 25, and one or two selected from a coloring pigment, a mica pigment and a metal powder pigment. A coating composition prepared by mixing one or more pigments with an organic solvent solution containing a film-forming polymer.

Next, various conditions for carrying out the present invention will be described. The plate-shaped iron oxide particles in the present invention,
Any of plate-like hematite particles, plate-like magnetite particles or plate-like maghemite particles can be used, and the size and form thereof are a plate surface diameter of 4 to 25 μm and a thickness of 0.16.
˜5 μm, and plate ratio (plate surface diameter / thickness) (hereinafter referred to as plate ratio) 5 to 25.

If the size and morphology of the plate-like iron oxide particles are outside the above range, the coating composition aimed at by the present invention cannot be obtained.

The plate surface diameter is 4 to 25 μm, and the thickness is 0.16 to
Plate-like hematite particles having a plate-like ratio of 5 to 25 and a plate-like ratio of 5 to 25 can be obtained by the following production method. That is,
An alkaline suspension having a pH of 13 or more containing polycrystalline needle-shaped hematite particles obtained by heating and dehydrating acicular hydrous ferric oxide particles at 260 to 750 ° C. and pH 13 or more is used.
The method includes hydrothermal treatment in the temperature range of 00 to 300 ° C., hydrothermal treatment in the temperature range of 200 to 300 ° C. in the alkaline suspension having pH 13 or more containing ferric oxide hydroxide particles.

The alkaline suspension in the method of 2 is 2
~ 15 wt% ferric oxide hydroxide particles and 0.0004 ~
It contains 0.2% by weight of polycrystalline hematite particles. Also,
The alkaline suspension in the above method contains 2 to 15% by weight of ferric hydroxide.

The hydrothermal treatment in the present invention is usually 200 to
2-6 at a temperature of 300 ° C, preferably 240-300 ° C
Performed using a time autoclave. Generally, the higher the alkali concentration, the more plate-like hematite particles are formed at the lower reaction temperature. If the temperature is lower than 200 ° C., the ferric oxide hydroxide particles remain in the suspension, and the plate-like hematite particles cannot be produced. Plate-like hematite particles can be generated even when the temperature exceeds 300 ° C, but the upper limit is 30 when considering the safety of the autoclave device.
It is 0 ° C.

The plate-like magnetite particles are obtained by heating and reducing the plate-like hematite particles in a temperature range of 300 to 450 ° C. in a reducing atmosphere.
It is obtained by further oxidizing the plate-shaped magnetite particles in the temperature range of 200 to 400 ° C. The obtained plate-like magnetite particles and plate-like maghemite particles are particles that retain and inherit the size and morphology of the plate-like hematite particles, and have a plate surface diameter of 4 to 25 μm and a thickness of 0.16 to 5 μm, and a plate ratio. 5 to 25.

In the case of the above method, the plate surface diameter is 4
~ 8 μm, thickness 0.16 to 0.5 μm, plate ratio 7 to 25
It is easy to obtain plate-like hematite particles to some extent. The larger the mixing ratio of the polycrystalline needle-like hematite particles to the ferric oxide hydroxide particles, the smaller the plate surface diameter of the plate-like hematite particles produced. Then, according to this method, the plate-shaped ratio of the plate-shaped hematite particles produced is increased, the particle orientation is excellent, and the plate-shaped hematite particles having a sharp particle size distribution are easily obtained. It also has a feature that plate-like hematite particles can be produced in a short time.

The acicular hydrous ferric oxide particles used to obtain the polycrystalline acicular hematite particles in the above method are α-FeOOH, β-FeOOH, and γ-FeOOH.
Etc. can be used, and the size of the long axis is from 0.05 to
It is preferable to use particles having a diameter of 3 μm and an axial ratio of 3 to 30.
The acicular hydrous iron oxide particles of this size are heated and dehydrated to have a major axis of 0.05 to 3 μm, an axial ratio of 3 to 30, and a BET specific surface area of 1.
It is preferable to obtain polycrystalline needle-like hematite particles having a crystal size of 0 to 150 m ² / g and a crystal size of 50Å to 500Å. The NaOH in the alkaline suspension is 0.1 to 10 N, preferably 0.3 to 6 N, and the Fe concentration is 0.05 to 1.5.
mol / l, preferably about 0.2 to 1.2 mol / l.

In the case of the above method, the plate surface diameter is 8 to
Plate-like hematite particles having a thickness of 25 μm, a thickness of 0.5 to 5 μm, and a plate ratio of about 5 to 10 are easily obtained. The plate surface diameter of the plate-like hematite particles produced tends to increase as the alkali concentration increases.

The ferric oxide hydroxide particles in the above and the above methods may be in the form of needles or spindles obtained by a usual method. Any of a reaction mother liquor containing ferric oxide hydroxide particles, a wet cake obtained by washing the reaction mother liquor with water, and a dry cake thereof can be used.

The concentration of NaOH in the alkaline suspension is 1 to 1
0N, preferably 3 to 6N. The Fe concentration in the alkaline suspension is 0.05 to 1.5 mol / l, preferably 0.2 to 1.2 mol / l. The thicker the concentration of NaOH in the alkaline suspension, the larger the plate surface diameter of the generated plate-like hematite particles.

As the coloring pigment in the present invention, a colored pigment used in ordinary paints can be used,
Specifically, for example, the above-mentioned copper phthalocyanine pigment, quinacridone pigment, perylene pigment, anthraquinone pigment,
Metal complex pigments, transparent iron oxide pigments, carbon black and the like can be used.

As the metal powder pigment used in the present invention, aluminum powder, copper powder, stainless powder and the like can be used, but among these, aluminum powder is most commonly used. As the mica pigment, conventionally known ones can be widely used, and examples thereof include transparent pearl mica, colored mica and interference mica. In the present invention, a coating film having a more decorative (aesthetic) hue can be formed by using several kinds of colored mica having different color tones in combination.

Examples of the film-forming polymer used in the present invention include acrylic resin, acrylic melamine resin, vinyl chloride-vinyl acetate copolymer resin, alkyd resin, polyester resin, polyurethane resin and amino resin. Polymers that have been conventionally used in the field of paints are mentioned. The polymer used in the present invention is not limited to the above resins.

As the organic solvent that dissolves or disperses the above film-forming polymer, those widely known for conventional paints are used. Specifically, for example, toluene, xylene, butyl acetate, ethyl acetate,
Methyl acetate, acetone, thymel ethyl ketone, methyl isobutyl ketone, methanol, ethanol, butanol, cyclohexanone and the like can be mentioned. The total amount of organic solvent used is 5 to 100 parts by weight of the coating composition.
It is 60% by weight, preferably 10 to 50% by weight.

In the coating composition of the present invention, the above-mentioned plate-shaped iron oxide particles are contained in an amount of 0.1% by weight based on 100 parts by weight of the coating composition.
It is used in a proportion of 005 to 50 parts by weight, preferably 1
~ 30 parts by weight. If it is less than 0.005 part by weight, the coating composition aimed at by the present invention cannot be obtained. Also,
If it exceeds 50 parts by weight, the coating composition aimed at by the present invention can be obtained, but the physical properties of the coating film deteriorate, which is not preferable.

The coloring pigment, mica pigment and metal powder pigment in the present invention can be used alone or in combination,
1.0 to 30 per 100 parts by weight of the coating composition
Parts by weight. The total amount of one or more pigments selected from coloring pigments, mica pigments and metal powder pigments is 0.01 to 1000 with respect to 100 parts by weight of plate-shaped iron oxide.
The amount is 0 parts by weight, preferably 0.1 to 5000 parts by weight, and 0.005 to 50 parts by weight, preferably 0.1 to 30 parts by weight, based on 100 parts by weight of the coating composition.

When the amount is less than 0.01 parts by weight with respect to 100 parts by weight of the plate-shaped iron oxide and less than 0.005 parts by weight with respect to 100 parts by weight of the coating composition, the aesthetic effect is not sufficiently exhibited, and 1000 to 100 parts by weight of plate-shaped iron oxide particles
If the amount exceeds 0 parts by weight, or if the amount exceeds 50 parts by weight with respect to 100 parts by weight of the coating composition, the texture of the coating film is impaired. In any case, therefore, the coating composition intended by the present invention can be obtained. Can not.

The coating composition of the present invention includes other fillers,
Antistatic agents, stabilizers, antioxidants, ultraviolet absorbers and the like can be added as necessary.

Next, to form a coating film using the coating composition of the present invention, the plate surface diameter is 4 to 25 μm and the thickness is 0.16 to 5
μm, plate-like iron oxide particles having a plate-like ratio of 5 to 25, and a color pigment,
One or two selected from mica pigment and metal powder pigment
One or more pigments are mixed with an organic solvent solution containing a film-forming polymer, and a coating composition is prepared with a sand mill, a high-speed stirrer or the like. The coating composition thus obtained is applied by spray coating, flow coating, roll coating or the like on a substrate such as a metal plate, glass, ceramics or a plastic plate which has been subjected to an undercoat treatment if necessary, followed by drying and curing. A colored coat layer is formed. Further, the colored coat layer is used as a base coat layer, and a clear coat agent prepared by dissolving or dispersing the same resin as the above-mentioned film-forming polymer in an organic solvent is applied on the base coat layer, followed by heat treatment after drying. A coating film can also be formed.

When preparing the coating composition of the present invention, a base coating prepared by mixing each of plate-like iron oxide particles, a coloring pigment, a mica pigment and a metal powder pigment with an organic solvent solution containing a film-forming polymer is used. It is preferable to make an adjustment in advance and mix a predetermined amount of this base paint to make an adjustment.

[0029]

First, the most important point in the present invention is that the plate surface diameter is 4 to 25 μm and the thickness is 0.16 to
Plate-like iron oxide particles having a plate-like ratio of 5 to 25 and having a plate-like ratio of 5 μm;
When blended with one or more selected from color pigments, mica pigments and metal powder pigments, diversification of coating film such as coating color and decorativeness, especially change in coating texture may be caused. It is a fact that it is possible to obtain a coating composition which is capable of designing a coating film with high saturation by virtue of its excellent hiding property and suppression of turbidity of hue.

The coating film formed by coating the substrate with the coating composition according to the present invention is excellent in decorativeness (aesthetics) because the coating color can be subtly changed. In other words, the highlight (the amount of reflected light is high) emphasizes the color tone of the color pigments, and the shade (the amount of reflected light is low) emphasizes the color tone of the plate-shaped iron oxide particles. These changes in the amount of reflected light result in a difference in brightness and a difference in saturation depending on the viewing direction, and can give a unique texture of the paint color (hereinafter, this decorative property (aesthetic) is referred to as geometric metamerism).

In the present invention, the coating composition obtained by using the plate-like iron oxide particles and the coloring pigment in combination is most preferable because it can form the coating having the most excellent geometric metamerism most effectively. is there.

Regarding the reason why the coating composition according to the present invention can form the above-mentioned characteristic coating film, the present inventor, as shown in Examples and Comparative Examples described later, has a plate-like shape having a size and a shape other than a specific range. When iron oxide particles are used in combination with one or more selected from coloring pigments, mica pigments and metal powder pigments, only plate-like iron oxide particles having a size and morphology in a specific range are used, and coloring pigments and mica are used. When one or more selected from pigments and metal powder pigments are not used in combination, plate-shaped iron oxide particles having a size or morphology in a specific range are not used, and selected from color pigments, mica pigments and metal powder pigments. In any of the cases where only one type or two or more types are used, the coating film aimed at by the present invention cannot be obtained, and therefore, a plate-like iron oxide particle having a size or morphology in a specific range is used. Color pigment, mica It is thought to be due to the synergistic effect of charge and in combination with the selected one or more of a metal powder pigment.

In the present invention, when plate-like hematite particles having a specific range of size and morphology are used, a coating film having a reddish brown hue and plate-like magnetite particles having a specific range of size and morphology are used. In some cases, a black-hued coating film,
When plate-like maghemite particles having a size or morphology in a specific range are used, a coating film having a dark brownish hue can be obtained, so that it is possible to meet the demand for more diversification.

[0034]

EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples. In Examples and Comparative Examples, parts or% are based on weight.

The geometrical metamerism of a coating film is represented by the colorimetric values of changes in hue and saturation when the incident light angle is fixed and the light receiving angle is variously changed, and the hue is H = tan ^−1.
b ^* / a ^*, chroma C - ^{[(a *) 2 + (b} *) 2 ]
The calculated value is ^1/2 . That is, the geometrical metamerism of the coating film is fixed at an incident light angle of -70 ° and a light receiving angle of -45 °.
The change rates of hue and saturation when changed at two angles of + 45 ° and + 45 ° were calculated, respectively, and shown as ΔH value and ΔC value. ΔH
The larger the value and ΔC value, the better the geometrical metamerism, and it can be widely applied to the diversification of coating films such as paint color and decorativeness.
The hiding property was measured by placing black-and-white black and white art paper on the same surface and simultaneously coating the film. It is recognized that the smaller the film thickness, the better the concealing property.

<Production of Plate-shaped Iron Oxide Particles> Production Examples 1 to 8; Production Example 1 Needle-shaped α-FeOOH particles (long axis 1 μm, axial ratio 20: 1,
Polycrystalline needle-like hematite particles obtained by heating and dehydrating BET specific surface area 60 m ² / g) at a temperature of 400 ° C. for 1 hour (long axis 1 μm, axial ratio 20: 1, BET specific surface area 80 m ² /
g, crystallite size 80Å) as seed particles, and 0.0044 mol of the seed particles (corresponding to 0.5% by weight with respect to α-FeOOH) and α-FeOOH (long axis 3 μm, axial ratio 10, BET specific surface area). 20 m ^{2 /} g) 0.8 mol and NaOH 0.3 mol and obtained pH 13.
The alkaline suspension of 2 was heated to 245 ° C. in an autoclave and kept at this temperature for 2 hours with mechanical stirring to form a dark purple precipitate. After cooling to room temperature, the dark purple precipitate was filtered off, washed thoroughly with water and dried. The obtained dry particle powder was a hematite particle as a result of X-ray diffraction, and as a result of electron microscope observation, a plate surface diameter of 6 μm and a thickness of 0.3.
It was 1 μm and the plate ratio was 19.

Production Example 2 The amount of seed particles used was 0.0019 mol (α-FeOO
This corresponds to 0.025% by weight with respect to H. ), Α-FeO
The amount of OH used was 0.7 mol, and the amount of NaOH used was 0.
Dark purple particle powder was obtained in the same manner as in Production Example 1 except that the amount was 4 mol and the hydrothermal treatment was performed at a temperature of 240 ° C. for 3 hours.
The obtained dry particle powder was a hematite particle as a result of X-ray diffraction, and as a result of electron microscope observation, a plate surface diameter was 8 μm, a thickness was 0.35 μm, and a plate ratio was 23.

Production Example 3 Same as Production Example 1 except that the seed particles were not used, the amount of α-FeOOH used was 0.8 mol, the amount of NaOH used was 3 mol, and the hydrothermal treatment was carried out at a temperature of 255 ° C. for 3 hours. To obtain dark purple particle powder. The obtained dry particle powder was a hematite particle as a result of X-ray diffraction, and as a result of electron microscope observation, a plate surface diameter was 10 μm, a thickness was 1.3 μm, and a plate ratio was 8.

Production Example 4 Needle-shaped α-FeOOH particles (long axis 1.5 μm, axial ratio 15,
Polycrystalline acicular hematite particles obtained by heating and dehydrating BET specific surface area 35 m ² / g) at a temperature of 400 ° C. for 1 hour (long axis 1.5 μm, axial ratio 15, BET specific surface area 45 m ² /
g, a crystallite size of 110Å) as seed particles, and the seed particles of 0.00018 mol (0.0 to α-FeOOH).
This corresponds to 2% by weight. ) And α-FeOOH (long axis 2.
5 μm, axial ratio 12, BET specific surface area 22 m ² / g)
An alkaline suspension having a pH of 13.0 obtained by mixing 8 mol and 0.2 mol of NaOH was heated to 255 ° C. in an autoclave, and mechanically stirred to reach this temperature.
Hold for a time to produce a dark purple precipitate. After cooling to room temperature, the dried precipitate was filtered off, washed thoroughly with water and dried. The dry powder was aerated with H ₂ gas at a rate of 1.0 l / min and reduced by heating at a reducing temperature of 400 ° C. for 2 hours. The obtained black particle powder was magnetite particles as a result of X-ray diffraction, and as a result of electron microscope observation, a plate surface diameter was 7 μm and a thickness was 0.39 μm.
And the plate ratio was 18.

Production Example 5 Same as Production Example 1 except that the seed particles were not used, the amount of α-FeOOH used was 1.0 mol, the amount of NaOH used was 5 mol, and the hydrothermal treatment was carried out at a temperature of 245 ° C. for 2 hours. To obtain a dry powder. The dried powder was heat-reduced for 1.5 hours at 380 ° C. in a H ₂ stream in the same manner as in Production Example 4.
The obtained black particle powder was magnetite particles as a result of X-ray diffraction, and the plate surface diameter was 11 μm as a result of electron microscope observation.
m, the thickness was 1.4 μm, and the plate ratio was 8.

Production Example 6 Same as Production Example 1 except that the seed particles were not used, the amount of α-FeOOH used was 1.3 mol, the amount of NaOH used was 8 mol, and the hydrothermal treatment was carried out at a temperature of 240 ° C. for 4 hours. To obtain a dry powder. The dried powder was heat-reduced in the same manner as in Production Example 4 in an H ₂ stream at 400 ° C. for 1.0 hour.
The obtained black particle powder was magnetite particles as a result of X-ray diffraction, and the plate surface diameter was 15 μm as a result of electron microscope observation.
m, the thickness was 2.2 μm, and the plate ratio was 7.

Production Example 7 The magnetite particles obtained in Production Example 4 were mixed at 280 ° C.
Was heat-treated with to obtain maghemite particles. The obtained maghemite particles had a plate surface diameter of 7 μm as a result of electron microscope observation.
m, the thickness was 0.39 μm, and the plate ratio was 18.

Production Example 8 (corresponding to Example 7 in JP-B-63-41853) α-FeOOH and 0.89% by weight of SiO _{2 based} on the α-FeOOH content are suspended in water. , Then
To the suspension was added 45% concentrated sodium hydroxide and mixed well to obtain a FeOOH content of 130 g / l and 320 g / l.
A suspension containing 1 l of NaOH was obtained. The suspension was heated to 240 ° C. in an autoclave and kept at this temperature for 4 hours, forming a dark purple precipitate. After cooling to room temperature, the dark purple precipitate was filtered off, washed thoroughly with water, and dried. The dry powder was found to be hematite particles by X-ray diffraction, and as a result of electron microscope observation, the plate surface diameter was 5.3 μm, the thickness was 0.14 μm, and the plate ratio was 38.

<Production of Coating Composition> Examples 1 to 13 Comparative Examples 1 to 7; Examples 1 to 3 (Formulation A) Plate-like hematite particles obtained in Production Example 1 (plate surface diameter 6 μm, thickness 0. 31 μm, plate ratio 19) 30 parts Acrylic varnish (solid content 60%) 82 parts Melamine varnish (solid content 60%) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7/3 mixed solution) 30 parts (Compound B) Plate-like hematite particles obtained in Production Example 2 (plate surface diameter 8 μm, thickness 0.35 μm, plate ratio 23) 30 parts Acrylic varnish (solid content 60%) 82 parts Melamine varnish (solid content 60% ) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7/3 mixed solution) 30 parts (Combination C) Plate-like hematite particles obtained in Production Example 3 (plate surface diameter 10 μm, thickness 1.3 μm, Plate ratio 8 30 parts Acrylic varnish (solid content 60%) 82 parts Melamine varnish (solid content 60%) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7/3 mixed solution) 30 parts (Compound D) Quinacridone pigment ( Product name: Chromo Fine Red 6820) (manufactured by Dainichiseika Co., Ltd.) 10 parts Acrylic varnish (solid content 60%) 82 parts Melamine varnish (solid content 60%) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate ( 7/3 mixed solution) 30 parts Dispersion treatment of each of the above formulations A to D using a sand mill, and further 50 parts of each of formulations A to C and formulation D5.
0 parts were uniformly mixed to obtain coating compositions I to III (each 100 parts by weight of the coating composition, various plate-like hematite particles 8.5.
5 parts by weight and 3.2 parts by weight of quinacridone pigment were obtained). (These are referred to as Example Paints I to III.)

Comparative Example 1 (Compound E) Granular hematite particles Product name: 120ED (manufactured by Toda Kogyo Co., Ltd.) (average diameter 0.3 μm) 30 parts Acrylic varnish (solid content 60%) 82 parts Melamine varnish (solid content 60%) 34 Part Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7/3 mixed solution) 30 parts Dispersion treatment of the above-mentioned formulation E in a sand mill, and 50 parts of formulation D and 50 parts of formulation E are evenly mixed to obtain a coating material. A composition (including 8.55 parts of granular hematite pigment and 3.2 parts by weight of quinacridone pigment per 100 parts by weight of the coating composition) was obtained. (This is referred to as Comparative Example Paint I.)

Examples 4 to 6 (Formulation F) Plate-like magnetite particles obtained in Production Example 4 (plate surface diameter 7 μm, thickness 0.39 μm, plate ratio 18) 30 parts Acrylic varnish (solid content 60%) 82 Part Melamine varnish (solid content 60%) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7/3 mixed solution) 30 parts (Compound G) Plate-like magnetite particles obtained in Production Example 5 (plate surface Diameter 11 μm, thickness 1.4 μm, plate ratio 8) 30 parts Acrylic varnish (solid content 60%) 82 parts Melamine varnish (solid content 60%) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7 / 3 mixed solution) 30 parts (formulation H) Plate-like magnetite particles obtained in Production Example 6 (plate surface diameter 15 μm, thickness 2.2 μm, plate ratio 7) 30 parts Acrylic varnish (solid content 60%) 82 parts Melamine varnish (solid content 60%) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7/3 mixed solution) 30 parts Dispersion treatment of each of the above formulations F to H was performed using a sand mill, and further blended. Formulation D5 with 50 parts of each of F to H
0 parts were evenly mixed to obtain coating compositions IV to VI (various plate-shaped magnetite particles 8. to 100 parts by weight of coating composition).
55 parts, including 3.2 parts of quinacridone pigment) were obtained.
(These are referred to as Example Paints IV to VI.)

Examples 7 to 9 (Formulation I) Carbon black Product name: FW-200 (manufactured by Degussa) 3 parts Acrylic varnish (solid content 60%) 60 parts Melamine varnish (solid content 60%) 20 parts Solvesso 100 (Exxon) Chemical Co., Ltd./Butyl acetate (7/3 mixed solution) 30 parts (Compound J) Pearl White (manufactured by Marl) 30 parts Acrylic varnish (60% solid content) 82 parts Melamine varnish (60% solid content) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7/3 mixed solution) 30 parts Dispersion treatment of the above compound I in a sand mill to create a carbon black paint base, and compound J in a high-speed stirrer. And dispersed to prepare a pearl paint base. And using the plate-shaped magnetite paint base of the above-mentioned compound G,
The paint bases were mixed uniformly with a stirrer in the following mixing ratios to prepare paint compositions VII to IX. (These are referred to as Example Paints VII to IX.)

Example Paint VII Formulation D (quinacridone paint base) 70 parts Formulation G (plate magnetite paint base) 30 parts The coating composition thus obtained is the coating composition 10
It contained 5.13 parts by weight of the plate-like magnetite particle powder and 4.48 parts by weight of the quinacridone pigment with respect to 0 part by weight.

Example Paint VIII Formulation D (quinacridone paint base) 60 parts Formulation G (plate magnetite paint base) 30 parts Formulation I (carbon black paint base) 2 parts Formulation J (pearl pigment base) 8 parts In this way The obtained coating composition is a coating composition 10
It contained 5.13 parts by weight of plate-like magnetite particle powder, 3.84 parts by weight of quinacridone pigment, 0.06 parts by weight of carbon black pigment, and 1.37 parts by weight of pearl pigment with respect to 0 parts by weight.

Example Paint IX Formulation D (quinacridone paint base) 50 parts Formulation G (plate magnetite paint base) 25 parts Formulation I (carbon black paint base) 5 parts Formulation J (pearl pigment base) 30 parts In this way The obtained coating composition is a coating composition 10
It contained 4.275 parts by weight of plate-like magnetite particle powder, 3.2 parts by weight of quinacridone pigment, 0.15 parts by weight of carbon black pigment and 3.42 parts by weight of pearl pigment, based on 0 part by weight.

Comparative Examples 2 to 3 A coating composition was obtained by uniformly mixing a coating base with a stirrer in the following mixing ratio. (These are comparative paint I
I to III. ) Comparative Example Paint II Formulation D (quinacridone paint base) 80 parts Formulation I (carbon black paint base) 10 parts Formulation J (pearl pigment base) 10 parts The coating composition thus obtained is the coating composition 10
Quinacridone pigment 5.12 parts by weight, carbon black pigment 0.3 parts by weight and pearl pigment 1.71 per 0 parts by weight
Included parts by weight.

Comparative Example Paint III Formulation D (quinacridone paint base) 70 parts Formulation I (carbon black paint base) 20 parts Formulation J (pearl pigment base) 10 parts The coating composition thus obtained is a coating composition 10
Quinacridone pigment 4.48 parts by weight, carbon black pigment 0.6 parts by weight and pearl pigment 1.71 per 0 parts by weight
Included parts by weight.

Comparative Example 4 (Compound K) Granular magnetite particles Product name: KN-320 (manufactured by Toda Kogyo) (average diameter 0.3 μm) 30 parts Acrylic varnish (solid content 60%) 82 parts Melamine varnish (solid content 60%) ) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7/3 mixed solution) 30 parts The above compound K was dispersed in a sand mill to obtain a magnetite coating base. Using this magnetite base, a paint base having the following composition was uniformly mixed with a stirrer to prepare a paint composition. The obtained coating composition was granular magnetite powder 8.5 per 100 parts by weight of the coating composition.
It contained 5 parts by weight and 3.2 parts by weight of quinacridone pigment. (This will be referred to as Comparative Example Paint IV.) Comparative Example Paint IV Formulation D (quinacridone paint base) 70 parts Formulation K (magnetite paint base) 30 parts

Comparative Example 5 (Compound L) 30 parts of plate-like hematite particles (plate surface diameter 5.3 μm, thickness 0.14 μm, plate-like ratio 38) obtained in Production Example 8 acrylic varnish (solid content 60%) 82 Part Melamine varnish (solid content 60%) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7/3 mixed solution) 30 parts Dispersion treatment of the above formulation L with a sand mill, and 50 parts by weight of the formulation L And 50 parts by weight of Formulation D were uniformly mixed with a stirrer to prepare a coating composition. The obtained coating composition had a plate-like hematite particle content of 8.5 based on 100 parts by weight of the coating composition.
It contained 5 parts by weight and 3.2 parts by weight of quinacridone pigment. (This is referred to as Comparative Example Paint V.) Comparative Example Paint V 50 parts of Formulation L (plate-like hematite paint base) Formulation D (quinacridone paint base) 50 parts

Comparative Example 6 (Compound M) Transparent iron oxide (trade name: TOR (manufactured by Dainichiseika Kogyo Co., Ltd.)) (average diameter 0.02 μm) 30 parts Acrylic varnish (solid content 60%) 82 parts Melamine varnish (solid content) 60%) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7/3 mixed solution) 30 parts Dispersion treatment of the above formulation M with a sand mill, and further 50 parts by weight of formulation M and 50 parts by weight of formulation D. The mixture was uniformly mixed to prepare a coating composition. The obtained coating composition is coating composition 1
It contained 8.55 parts by weight of a transparent iron oxide pigment and 3.2 parts by weight of a quinacridone pigment with respect to 00 parts by weight. (This is referred to as Comparative Example Paint VI.) Comparative Example Paint VI Formulation M (transparent iron oxide paint base) 50 parts Formulation D (quinacridone paint base) 50 parts

Comparative Example 7 The compound B was dispersed in a sand mill to obtain a coating composition (100 parts of the coating composition and 1 part of the plate-like hematite particles).
(Including 7.1 parts by weight). This is a comparative example paint VII
And

Example 10 Formulation J was subjected to dispersion treatment using a high-speed mixer to obtain Formulation J.
50 parts and 50 parts of Formulation A are uniformly mixed to obtain a coating composition X
(Comprising 8.55 parts by weight of plate-like hematite particles and 8.55 parts by weight of quinacridone pigment per 100 parts by weight of the coating composition) was obtained.

Example 11 (Formulation N) Aluminum pigment (trade name: 7130N (manufactured by Toyo Aluminum Co., Ltd.) 30 parts Acrylic varnish (solid content 60%) 82 parts Melamine varnish (solid content 60%) 34 parts Solvesso 100 ( Exxon Chemical Co., Ltd./Butyl acetate (7/3 mixed solution) 30 parts Each of the above formulations A, D and N is uniformly mixed, and the coating composition XI (based on 100 parts by weight of the coating composition) is mixed in the following mixing ratio. (Comprising 8.55 parts by weight of plate-like hematite particles, 0.64 parts by weight of quinacridone pigment and 4.44 parts by weight of aluminum pigment) Example Paint XI Formulation A 50 parts Formulation D 10 parts Formulation N 40 parts

Example 12 Each of the above-mentioned formulations F, D and N was uniformly mixed, and coating composition XII (8.55 parts by weight of plate-like magnetite particles to 100 parts by weight of the coating composition, quinacridone pigment) was added in the following mixing ratio. (Including 0.64 parts by weight and 4.44 parts by weight of aluminum pigment). Example Paint XII Formulation F 50 parts Formulation D 10 parts Formulation N 40 parts

Example 13 (Compounding O) 30 parts of plate-like maghemite particle powder (plate surface diameter: 7 μm, thickness 0.39 μm, plate-like ratio 18) obtained in Production Example 7 acrylic varnish (solid content 60%) 82 Part Melamine varnish (solid content 60%) 34 parts Solvesso 100 (Exxon Chemical Co., Ltd.) / Butyl acetate (7/3 mixed solution) 30 parts Dispersion treatment of the above formulation O using a sand mill, and uniform distribution at the following formulation ratio The coating composition XIII (plate-shaped maghemite particles 8.55 with respect to 100 parts by weight of the coating composition)
Parts by weight and 3.2 parts by weight of quinacridone pigment) were obtained. Example Paint XIII Formulation O 50 parts Formulation D 50 parts

Each of the example paints I to XIII obtained in the above examples 1 to 13 and the comparative paints I to VII obtained in the comparative examples 1 to 7 was spray-viscosified (14 in Ford viscosity cup No. 4). (Seconds) thinner dilution, and spray painting was performed on the steel panel that had been subjected to the base treatment with an air spray gun. After drying for 10 minutes, clear (acrylic melamine) coating was similarly performed with an air spray gun. After drying for 15 minutes at room temperature, it was baked and cured at 140 ° C. for 30 minutes to prepare a steel panel.

The geometrical metamerism of these panels,
The results of measuring the hiding property are shown in Table 1, and the composition ratio of the coating composition is shown in Table 2.

[0063]

[Table 1]

[0064]

[Table 2]

[0065]

EFFECTS OF THE INVENTION The coating composition according to the present invention can diversify a coating film such as coating color and decorative property, and in particular, can change the texture of the coating film. Since it is possible to design a coating film with high saturation because it can be suppressed, it is most suitable for protection and decoration of automobiles, motorcycles and the like.

Continuation of the front page (72) Inventor Nansei Horiishi 4-1-2 Funairinami Naka-ku, Hiroshima City, Hiroshima Prefecture Toda Industry Co., Ltd. Creative Center

Claims (1)

[Claims] 1. A plate surface diameter of 4 to 25 μm and a thickness of 0.16
An organic compound containing a film-forming polymer having a plate-like iron oxide particle having a plate-like ratio of 5 to 25 μm and one or more pigments selected from color pigments, mica pigments and metal powder pigments. A coating composition obtained by mixing with a solvent solution.