JPH08259841A - Pearly luster pigment and coating material composition, cosmetic, ink and plastics blended with the same - Google Patents

Abstract

PURPOSE: To obtain a pigment for a coating material, etc., by coating a synthetic mica having a smooth particle surface and an iron content equal to or lower than a specific value with a metal oxide, showing no yellow at a mass tone angle and a shade part, causing no faded color of an interference color. CONSTITUTION: A synthetic mica (e.g. tetrasilicon fluoride mica, etc.) containing Ti, Zn, Na, B, Li, Ca, Ge, Sr, Zr, etc., having <=1.58 average refractive index and <=1.0% iron content is mixed with water while stirring, blended with a solution of titanyl sulfate, rapidly heated to 100 deg.C, reacted at the temperature for 3 hours, filtered, washed with water and dried at 110 deg.C to give powder,, which is baked at 800 deg.C for 1 hour to give the objective pigment for a coating material, etc., by coating a synthetic mica which comprises the synthetic mica coated with a metal oxide (e.g. titanium dioxide, etc.), shows no yellow at a mass tone angle and a shade part, has solved the problem of a faded color of an interference color and is useful as a coating composition, cosmetic, ink, plastics etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pearl luster pigment using synthetic mica as a substrate, and a paint, cosmetics, ink and plastic containing the pearl luster pigment.

[0002]

2. Description of the Related Art A pearl luster pigment which gives a pearly feel by coating a natural mica with a metal oxide such as iron oxide or titanium oxide has been known. Then, this kind of conventional par
The luster pigment has a drawback that a mica-specific yellowish color appears in the mast angle and shade portions and that the interference effect is weak, and therefore the interference color is blurred. On the other hand, synthetic mica gives a product with extremely high transparency, and in that respect
It can be said that it is an excellent substrate for luster pigments. However, the pearl luster pigment using the conventionally known synthetic mica has a problem that the mast angle and the shade portion have a yellowish tint and the interference color is blurred as in the case of using natural mica. there were.

[0003]

SUMMARY OF THE INVENTION The present invention is intended to solve such a problem, and solves the problems that the mast angle and the shade portion have a yellowish tint and the interference color is blurred. It is an object of the present invention to provide a pearl luster pigment using the synthetic mica as a substrate.

[0004]

Means for Solving the Problems As a result of intensive research to solve the above-mentioned problems, the inventors of the present invention have confirmed that the raw material and the manufacturing process do not mix iron in the synthetic mica with an iron content of 1.0%. The following synthetic mica was synthesized, and the pearl luster pigment using this as a substrate showed the unexpected fact that there was no problem that the interference color was blurred due to the yellowish appearance at the mast angle and shade part. Found and arrived at the present invention.
That is, in the present invention, in a pearl luster pigment obtained by coating a synthetic mica with a metal oxide, the particle surface of the synthetic mica is made smooth and the iron content in the synthetic mica is 1.0% or less. Is characterized by.

The synthetic mica used in the present invention is represented by the following formula (1). X _0.5-1 Y _2-3 Z ₄ O ₁₀ (F, OH) ₂ (1) In the formula, X is an interlayer ion occupying the position of coordination number 12, and
K ⁺ , Na ⁺ , Li ⁺ , Rb ⁺ , Cs ⁺ , Tl ⁺ , Ca ²⁺ , S
Representing r ²⁺ and Ba ²⁺ , Y is an octahedral ion occupying the position of coordination number 6, and is Mg ²⁺ , Fe ²⁺ , Co ²⁺ , Ni ²⁺ , Mn.
²⁺ , Li ⁺ , Ti2 ⁺ , Zn2 ⁺ , Cu2 ⁺ , Al3 ⁺ , T
i ³⁺ , Cr ³⁺ , Fe ³⁺ , Mn ³⁺ , and Z is a coordination number 4
Of tetrahedral ions occupying the positions of Si ⁴⁺ , Al ³⁺ , B ³⁺ ,
It represents Fe ³⁺ , Mn ³⁺ , Be ²⁺ , Zn ²⁺ , Ge ⁴⁺ .

Among the above synthetic mica, Ti, Zn, N
It is preferable to use a synthetic mica containing 0.01 to 5% of at least one selected from the group consisting of a, B, Li, Ca, Ge, Sr and Zr. The iron content in the synthetic mica used in the present invention needs to be 1.0% or less, and preferably 0.1% or less. If the content is larger than this, problems such as yellowing at the mast angle and shade portions and blurring of the interference color occur. In particular, when the iron content is set to 0.1% or less, there is no problem of yellowing at the mast angle and shade portions and blurring of interference colors.

According to the description in the literature, the conventionally known synthetic mica contains 0.01 mol (0.13% in terms of Fe) of iron. The synthetic mica of the present invention having a total iron content of 1.0% or less can be manufactured as follows. Synthetic mica raw material SiO ₂ , MgO, Al
₂ O ₃ , K ₂ iF ₆ , KF, talc, feldspar, etc. are selected or purified so that the total iron content of impurities contained in the raw material is 1.0% or less in total. Further, in order to prevent Fe from being mixed in from a mixer or the like when mixing the raw materials, a mixer or the like coated with ceramics or the like is used. Further, the iron content mixed in the mixing and crushing steps may be used in a deironing machine after crushing, if necessary, in an inorganic acid, an organic acid, or a crusher.
It is advisable to remove it by using an agent.

The surface of the synthetic mica powder used in the present invention must be smooth. Synthetic mica has hard crystals,
Since it is difficult to cleave, it cannot be made into a flaky shape having a smooth surface by a usual method, and an irregularly shaped powder having a jagged cross section and a surface is obtained. In order to obtain a synthetic mica powder having a smooth surface, finely pulverizing a synthetic mica crystal mass that is easy to peel off.
In order to obtain a synthetic mica crystal mass that can be easily peeled off, for example, when the synthetic mica is melt-synthesized, at least 1% or more of the synthetic mica fine powder is added to the synthetic mica melt to coagulate and crystallize. Such synthetic mica crystal lumps are easily peeled off, and even if they are made into pieces by an ordinary crushing machine such as a Jaw crusher, it is possible to prevent the mica surface from being roughened and damaged.

[0009] The above synthetic mica strip can be treated, for example, with a hammer.
When finely pulverized to a size of about 100 microns or less using a mill, roll mill, ball mill, etc., the mica pieces are subjected to excessive crushing force as they are, resulting in an irregularly shaped powder having a jagged cross section and surface. . Therefore, for example, by adding a high-viscosity medium liquid such as glycerin, liquid paraffin, or ethylene glycol, the mica can be pulverized without roughening the surface. In the present invention, 60
It is also possible to use a mica surface that has been smoothed by heat treatment at 0 to 1350 ° C. The refractive index of the synthetic mica used in the present invention is preferably 1.58 or less. By using such synthetic mica, the lustrous feeling of the pearl luster pigment is improved, the color becomes vivid, and the residual color does not become turbid. This is probably because the difference in refractive index with the oxide to be coated is large, and the difference in refractive index with the organic resin (refractive index 1.4 to 1.6) to which the pearl luster pigment of the present invention is applied is small. This is probably because the reason has not been fully understood theoretically.

As the synthetic mica used in the present invention, it is preferable to use scaly particles having a diameter in the plane direction of 3 to 100 μm and a thickness of 0.05 to 1 μm. By using such synthetic mica, the lustrous feeling of the pearl luster pigment is improved, the color becomes vivid, and the residual color does not become turbid. The aspect ratio of the synthetic mica is preferably 60 or more, and if it is smaller than this, the interference effect becomes insufficient and the gloss becomes difficult. As the synthetic mica used in the present invention, for example, fluorophlogopite such as fluorophlogopite, fluorotetrasilicon phlogopite, fluoro teniolite, and isomorphs thereof can be preferably used, but especially fluorophlogopite is used. preferable. The synthetic mica itself may be produced by any of melt synthesis, hydrothermal synthesis, solid-state reaction, etc., but the melt synthesis method is particularly preferable because of its good crystallinity.

The synthetic mica powder may be coated with a metal oxide by a known method. For example, the method of coating with titanium oxide is to suspend the synthetic mica powder in a dilute aqueous solution of titanic acid, heat it to 70 to 100 ° C., hydrolyze the titanium salt, and hydrate it on the synthetic mica powder. It can be manufactured by precipitating titanium oxide particles and then firing at a high temperature of 700 to 1000 ° C. The metal oxide used is
Examples thereof include oxides of titanium, zirconium, iron, chromium or vanadium. These can be used alone or in combination. The metal oxide, preferably titanium dioxide, is preferably rutiled with a rutile agent such as tin chloride. Such rutile conversion improves the weather resistance of the pearlescent pigment. The pearly luster pigment of the present invention is a plastic which is mixed with various paints to form a paint composition or kneaded with various plastics in the same manner as in the conventional pearly luster pigment to express a unique pearly feeling. Or as a colorant for cosmetics or as a colorant for inks.

[0012]

The use of the synthetic mica of the present invention having an iron content of 1.0% or less and a smooth surface as a base material causes a yellowish tint at the mast angle and shade portions, and the interference color is blurred. It is possible to obtain a pearl luster pigment that does not substantially occur, however, the reason therefor is not fully understood theoretically.

[0013]

EXAMPLES Next, the present invention will be further described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. Example 1 20 g of synthetic fluorophlogopite powder having an average particle size of 10 to 60 μm (average refractive index 1.56, iron content 0.04%) and 400 ml of water were placed in a 1 liter glass container and stirred. did. Then, in this, a titanyl sulfate solution (TiO 2
₂ 80 g / liter) 200 ml,
The temperature was rapidly raised to 100 ° C., and the reaction was carried out at this temperature for 3 hours. After the reaction was completed, it was filtered, washed with water, and dried at a temperature of 110 ° C. The obtained powder was calcined at 800 ° C. for 1 hour to obtain a pearl luster pigment of the present invention. This pearl luster pigment, when dispersed in a clear lacquer, exhibited a golden color with a satisfactory and sufficiently lustrous shine. The mast angle and shade of the shade portion of this pearl luster pigment and the blurring of interference color were measured. The results are shown in Table I below.

(Test method) The tone of the mast angle and shade portion was determined by applying a paint containing a pearl luster pigment to a white background panel and drying it, and then the resulting coating film surface was examined from the angle at which no interference color was visible. It was observed and the presence or absence of yellowing was evaluated according to the following three-stage criteria. ∘: No yellowish color was observed. O: A very slight yellowish tint was observed. X: A considerable yellowish color was observed. Interference color blurring is a white background or a black background panel, a coating containing a pearl luster pigment is applied and dried, the interference color of the obtained coating film surface is observed, and the interference color itself is blurred. The evaluation was made according to the following three-stage criteria. ◎ ... There was no color blur at all. O: A very slight color blur was observed. × ・ ・ ・ ・ ・ ・ A considerable amount of color blur was observed.

Example 2 25 g of boron-containing synthetic fluorophlogopite powder having an average particle size of 10 to 60 μm (average refractive index 1.52, iron content 0.05%) and 400 ml of water were placed in a 1-liter glass container. It was put in and stirred. Then, 200 ml of a titanyl sulfate solution (TiO ₂ 80 g / liter) was added thereto, and the mixture was rapidly heated to 100 ° C. and reacted at this temperature for 3 hours. After the reaction was completed, it was filtered, washed with water, and dried at a temperature of 110 ° C. The whole amount of this dried product was transferred into a glass container, 570 ml of water was added, and the mixture was stirred. To this, 30 ml of a zirconium sulfate solution (ZrO ₂ = 100 g / liter) was added, and urea was gradually added to adjust the pH to 2.0. The solution is rapidly heated to 100 ° C.
The reaction was continued for 1 hour. After completion of the reaction, the mixture was filtered, washed with water, dried at 110 ° C., and then calcined at 800 ° C. for 1 hour to obtain a pearl luster pigment of the present invention. When this pearl luster pigment was dispersed in a clear lacquer, a bright golden color was exhibited. In the same manner as in Example 1, the mast angle of this pearl luster pigment, the shade of the shade portion and the blurring of the interference color were measured. The results are shown in Table I below.

Example 3 The same synthetic fluorophlogopite powder 30 used in Example 1
g and 400 ml of water were placed in a 1 liter glass container and stirred. Next, 200 ml of a zirconium sulfate solution (ZrO ₂ = 100 g / liter) was added thereto, and urea was gradually added to adjust the pH to 2.0. The solution is rapidly heated to 100 ° C,
The reaction was continued for 3 hours. After completion of the reaction, filtration, washing with water, 1
After drying at 10 ° C., it was baked at 800 ° C. for 1 hour to obtain a pearlescent pigment of the present invention. The pearl luster pigment, when dispersed in a clear lacquer, exhibited a yellowish silver-white appearance and a satisfactorily lustrous glow. In the same manner as in Example 1, the mast angle of this pearl luster pigment, the shade of the shade portion and the blurring of the interference color were measured. The results are shown in Table I below.

Example 4 Sodium-containing synthetic fluorophlogopite powder having a particle size of 10 to 60 μm (average refractive index 1.53, iron content 0.10%) 25
g and 370 ml of water were placed in a 1 liter glass container and stirred. Then, 30 ml of a chromic sulfate solution (Cr ₂ O ₃ = 100 g / liter) was added thereto and heated to 90 ° C. Further, 200 ml of a titanyl sulfate solution (TiO ₂ 80 g / liter) was added and heated to 100 ° C., and the reaction was continued for 3 hours. After completion of the reaction, the mixture was filtered, washed with water, dried at about 110 ° C., and calcined at 800 ° C. for 1 hour to obtain a pearlescent pigment of the present invention. This pearl luster pigment showed a vivid golden reflection color. In the same manner as in Example 1, the mast angle of this pearl luster pigment, the shade of the shade portion and the blurring of the interference color were measured. The results are shown in Table I below.

Example 5 45 g of titanium dioxide-coated synthetic mica was prepared in the same manner as in Example 1, except that 30 g of the synthetic fluorophlogopite powder used in Example 1 was used. Transfer all of this to a glass container,
570 ml of water was added and stirred. To this, 30 ml of ferric sulfate solution (Fe ₂ O ₃ = 100 g / liter) was added, and urea was gradually added to adjust the pH to 2.0. The solution is rapidly heated to 100 ° C,
The reaction was continued for 1 hour. After completion of the reaction, filtration, washing with water, 1
After drying at 10 ° C., it was baked at 800 ° C. for 1 hour to obtain a pearlescent pigment of the present invention. This pearl luster pigment, when dispersed in a clear lacquer, exhibited an excellent interfering pearl luster with a deep golden reflection color. In the same manner as in Example 1, the mast angle of this pearl luster pigment, the shade of the shade portion and the blurring of the interference color were measured. The results are shown in Table I below.

Example 6 Titanium dioxide was prepared in the same manner as in Example 1 except that synthetic fluorophlogopite powder having an average particle diameter of 10 to 60 μm (average refractive index 1.56, iron content 1.0%) was used. A coated mica was produced. When this was dispersed in a clear lacquer, it exhibited a golden color and exhibited a satisfactory and sufficiently lustrous glow. In the same manner as in Example 1, the mast angle of this pearl luster pigment, the shade of the shade portion and the blurring of the interference color were measured. The results are shown in Table I below.

Example 7 20 g of synthetic fluorophlogopite powder containing 1% of Ti (average refractive index 1.56, iron content 0.04%) and 400 ml of water were placed in a 1 liter glass container. And stirred. Then, a titanyl sulfate solution (TiO ₂
(80 g / liter) 200 ml was added, and the mixture was rapidly heated to 100 ° C. and reacted at this temperature for 3 hours. After the reaction was completed, it was filtered, washed with water, and dried at a temperature of 110 ° C. The obtained powder was calcined at 800 ° C. for 1 hour to obtain a pearl luster pigment of the present invention. This pearl luster pigment, when dispersed in a clear lacquer, exhibited a golden color with a satisfactory and sufficiently lustrous shine. The mast angle and shade of the shade portion of this pearl luster pigment and the blurring of interference color were measured. The results are shown in Table I below.

Examples 8 to 16 The pearlescent pigments of the present invention were obtained in the same manner as in Example 1 except that the following synthetic fluorophlogopite powder was used. Example 8 Synthetic fluorophlogopite containing 1% Zn (Fe content 0.06%) Example 9 Synthetic fluorophlogopite containing 1% Ba (Fe content 0.04%) Example 10 Containing 1% Na Synthetic Fluoro phlogopite (Fe content 0.05%) Example 11 Synthetic fluorophlogopite containing B 1% (Fe content 0.04%) Example 12 Synthetic fluorophlogopite containing Li 1% (Fe content) Amount 0.04%) Example 13 Synthetic Fluoro phlogopite containing 1% Ca (Fe content 0.07%) Example 14 Synthetic fluorophlogopite containing 1% Ge (Fe content 0.04%) Example 15 Synthetic Fluoro phlogopite containing 1% Sr (Fe content 0.84%) Example 16 Synthetic fluorophlogopite containing 1% Zr (Fe content 0.04%) All of these are in clear lacquer. Disperse in And showed a golden color and a sufficiently glossy glow that was satisfactory. The mast angle and shade of the shade portion of this pearl luster pigment and the blurring of interference color were measured. The results are shown in Table I below.

Example 17 25 g of synthetic fluorophlogopite powder containing 1% Zn (iron content: 0.05%) and 370 ml of water were placed in a 1-liter glass container and stirred. Then, 30 ml of a chromic sulfate solution (Cr ₂ O ₃ = 100 g / liter) was added thereto and heated to 90 ° C. Further, 200 ml of a titanyl sulfate solution (TiO ₂ 80 g / liter) was added and heated to 100 ° C., and the reaction was continued for 3 hours. After completion of the reaction, the mixture was filtered, washed with water, dried at 110 ° C., and then calcined at 800 ° C. for 1 hour to obtain a pearl luster pigment of the present invention. This pearl luster pigment showed a vivid golden reflection color. In the same manner as in Example 1, the mast angle of this pearl luster pigment, the shade of the shade portion and the blurring of the interference color were measured. The results are shown in Table I below.

Example 18 Average particle size in plane direction 20 μm, average aspect ratio 80
Synthetic Fluor phlogopite powder (iron content 0.04%) 20g
And 400 ml of water were placed in a 1 liter glass container and stirred. To this, 5 ml of tin chloride solution (5 wt% solution in terms of tin oxide) was added,
The reaction was carried out at 30 ° C. for 30 minutes. Then, 200 ml of a titanyl sulfate solution (TiO ₂ 80 g / l) was added thereto, and the mixture was rapidly heated to 100 ° C. and reacted at this temperature for 3 hours. After completion of the reaction, filtration and washing with water
It was dried at a temperature of ° C. The obtained powder was calcined at 800 ° C. for 1 hour to obtain a pearl luster pigment of the present invention. When the crystal form of the coated titanium dioxide layer was identified by the powder X-ray diffraction method, the diffraction peak based on the anatase type crystal was not seen, but the diffraction peak based on the rutile type crystal was observed. This pearl luster pigment, when dispersed in a clear lacquer, exhibited a golden color with a satisfactory and sufficiently lustrous shine. The mast angle and shade of the shade portion of this pearl luster pigment and the blurring of interference color were measured. The results are shown in Table I below.

Example 19 Average particle size in plane direction: 20 μm, average aspect ratio: 80
Synthetic Fluor phlogopite powder (iron content 0.05%) 30g
And 400 ml of water were placed in a 1 liter glass container and stirred. Next, 200 ml of a zirconium sulfate solution (ZrO ₂ = 100 g / liter) was added thereto, and urea was gradually added to adjust the pH to 2.0. The solution is rapidly heated to 100 ° C,
The reaction was continued for 3 hours. After completion of the reaction, filtration, washing with water, 1
After drying at 10 ° C., it was baked at 900 ° C. for 1 hour to obtain a pearlescent pigment of the present invention. The pearl luster pigment, when dispersed in a clear lacquer, exhibited a yellowish silver-white appearance and a satisfactorily lustrous glow. In the same manner as in Example 1, the mast angle of this pearl luster pigment, the shade of the shade portion and the blurring of the interference color were measured. The results are shown in Table I below.

Example 20 Surface-direction average particle diameter 30 μm, average aspect ratio 10
0 Synthetic Fluor phlogopite powder (iron content 0.05%) 25
g and 370 ml of water were placed in a 1 liter glass container and stirred. Then, 30 ml of a chromic sulfate solution (Cr ₂ O ₃ = 100 g / liter) was added thereto and heated to 90 ° C. Further, 200 ml of a titanyl sulfate solution (TiO ₂ 80 g / liter) was added and heated to 100 ° C., and the reaction was continued for 3 hours. After completion of the reaction, the mixture was filtered, washed with water, dried at about 110 ° C., and calcined at 700 ° C. for 1 hour to obtain a pearl luster pigment of the present invention. This pearl luster pigment showed a vivid golden reflection color. In the same manner as in Example 1, the mast angle of this pearl luster pigment, the shade of the shade portion and the blurring of the interference color were measured. The results are shown in Table I below.

Comparative Example 1 Natural muscovite powder (Fe content 1.2%, average refractive index 1.
A titanium dioxide-coated mica was produced in the same manner as in Example 1 except that 60) was used. When this product was dispersed in a clear lacquer, it showed a golden pearl luster, but compared with the pigment of the present invention of Example 1, the color width of the interference band was narrower,
Moreover, the residual color was turbid, and the clarity of color development was lacking. In the same manner as in Example 1, the mast angle of this pearl luster pigment, the shade of the shade portion and the blurring of the interference color were measured. The results are shown in Table I below.

Comparative Example 2 Natural muscovite powder (Fe content 1.1%, average refractive index 1.
A zirconium dioxide-coated mica was produced in the same manner as in Example 3 except that 60) was used. When this product was dispersed in a clear lacquer, it exhibited a silver-white pearlescent luster, but compared to the pigment of the present invention of Example 1, the interference band had a narrower color range, and the residual color was turbid, resulting in color development. It lacked in clarity. In the same manner as in Example 1, the mast angle and shade of the shade portion of this pearlescent pigment and the blurring of interference color were measured. The results are shown in Table I below.

[0028]

[Table 1]

Example 21: Coating material The pearl luster pigment of the present invention obtained in Example 1 was converted into a thermosetting acrylic melamine resin (manufactured by Dainippon Ink and manufactured by Acridic 47-712 and Super Beckamine G821-60). 10% by weight in a weight ratio of 7: 3), and sprayed on a steel plate coated with black enamel (Super Paint F-47, manufactured by Nippon Paint Co., Ltd.) and wet-on-wet for thermosetting acrylic. Melamine resin (manufactured by Dainippon Ink Co., Ltd., Acridic 44-179 and Super Beckamine L117-60
(7: 3 weight ratio mixture) was sprayed on top clear and baked at 140 ° C. for 18 minutes. The coating exhibited a golden iris pearl luster with high saturation, brightness and interference.

Example 22: Plastic 4 parts of the inventive pearl luster pigment obtained in Example 1 are mixed with about 100 parts of vinyl chloride resin, 40 parts of dioctyl phthalate and 3 parts of zinc stearate. Then, it was treated with two kneading rolls heated to 165 ° C. for 3 minutes, and this was molded into a sheet having a thickness of 0.5 mm. A beautiful vinyl chloride sheet with semi-transparent reflected light and a golden iris pearl luster was obtained.

Example 23: Cosmetic (lipstick) A lipstick was produced from the following composition. Pigment obtained in Example 1 15 parts Red No. 226 1 part Perfume 0.5 part Lipstick base material 83.5 parts However, the following lipstick base materials were blended and used. Beeswax 15 parts Cetyl alcohol 3 parts Lanolin 15 parts Castor oil 62 parts Fluid paraffin 5 parts The lipstick thus produced showed a golden bright pearlescent luster.

Example 24: Cosmetic (foundation cream) The pigment obtained in Example 3 20 parts Liquid paraffin 25 parts Vaseline 5 parts Isopropyl myristate 5 parts Stearic acid 2 parts POE (25) monostearate 2 parts Yellow iron oxide 2 parts Bengal 1 part Talc 5 parts Propylene glycol 5 parts Glycerin 5 parts Perfume 0.5 parts Purified water 22.5 parts After uniformly dissolving and mixing the above formulation at 75 to 80 ° C The product was cooled to 30 ° C. This product had a high degree of sharpness and was excellent in spreadability, so that it was very easy to apply makeup, and the makeup was not damaged.

Example 25: Ink 15 parts of the pigment obtained in Example 1 was added to 100 parts of gravure ink medium and mixed well to prepare a gravure pal ink. Printing paper printed with this ink is
It had a flowing iris pearl luster and a golden interference color full of luxury.

[0034]

[Effect] As described above, according to the present invention, by setting the iron content of the raw material synthetic mica to 1.0% or less,
As the mica's unique color in the mast angle and shade part disappears, the interference effect becomes stronger, and the problem of the underlying color becoming white when applied is solved, so the bright feeling of the pearl luster pigment And the sharpness of color are remarkably improved, and a remarkable brilliance that is not seen at all in conventional pearl luster pigments of this kind is exhibited, so that it is extremely useful as a new brilliant material for paints, plastics, inks and cosmetics. is there.

Claims (12)

[Claims] 1. A metal mica coated synthetic oxide mica.
In the luster pigment, the particle surface of the synthetic mica is made smooth, and the iron content in the synthetic mica is 1.0% or less. 2. The average refractive index of the synthetic mica is 1.58.
The pearlescent pigment according to claim 1, which is as follows. 3. The synthetic mica is Ti, Zn, Na,
The pearlescent pigment according to claim 1, which comprises 0.01 to 5% of at least one selected from the group consisting of B, Li, Ca, Ge, Sr, and Zr. 4. The pearl luster pigment according to claim 1, wherein the iron content in the synthetic mica is 0.1% or less. 5. The synthetic mica has a diameter of 3 to 1 in the plane direction.
The pearl luster pigment according to any one of claims 1 to 4, which is a scaly particle having a size of 00 microns and a thickness of 0.05 to 1 micron. 6. The average aspect ratio of the synthetic mica is 6
The pearl luster pigment according to any one of claims 1 to 5, which is 0 or more. 7. The pearlescent pigment according to claim 1, which is formed by rutileizing the metal oxide. 8. The pearlescent pigment according to claim 7, wherein the metal oxide is titanium dioxide, and the titanium dioxide is rutile-ized with tin chloride. 9. A perforated sheet of synthetic mica coated with a metal oxide.
A coating composition comprising a pearl luster pigment having a particle surface of the synthetic mica smoothed and having an iron content in the synthetic mica of 1.0% or less. 10. A pearl luster pigment comprising a synthetic mica coated with a metal oxide, wherein the surface of the particles of the synthetic mica is made smooth, and the iron content in the synthetic mica is 1.0% or less. -A cosmetic material characterized by containing a luster pigment. 11. A pearl luster pigment comprising a synthetic mica coated with a metal oxide, wherein the particle surface of the synthetic mica is made smooth, and the iron content in the synthetic mica is 1.0% or less. -An ink characterized by containing a luster pigment. 12. A pearl luster pigment comprising a synthetic mica coated with a metal oxide, wherein the surface of the particles of the synthetic mica is made smooth, and the iron content in the synthetic mica is 1.0% or less. -A plastic characterized by containing a luster pigment.