JPH0693205A - Pigment for decoration - Google Patents

Abstract

PURPOSE:To obtain a pigment, capable of manifesting high whiteness and producing bright feeling even when viewed from any angle without carrying out the orientation thereof and useful as coatings, cosmetics, etc., by coating the surface of specific mica with a prescribed amount of metallic oxide fine particles. CONSTITUTION:The pigment is obtained by coating the surface of mica such as synthetic mica having 0.1-5mm grain diameter with one or more metallic oxide fine particles such as TiO2, Fe2O3 SnO2, ZrO2, Cr2O3 or V2O5 in an amount of 0.1-15wt.% based on the mica.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative pigment used in applications such as paints, plastics, ceramics, and cosmetics. The present invention relates to a novel decorative pigment that expresses the luster of the above.

[0002]

2. Description of the Related Art A pearl luster pigment (pearl mica) in which natural mica is coated with a metal oxide such as titanium dioxide is conventionally known. However, the conventional pearl mica of this kind has a problem that it does not have a brilliance feeling unless it is oriented, and only the oriented surface has a brilliance. Not only that, but also in terms of brilliance, there was no feeling like a shining star, and it was not yet fully satisfactory in practical use.

[0003]

The present invention has been made paying attention to such a point, and a novel decoration which gives a glittering feeling like a shining star even when viewed from any angle without orientation. An object is to provide a pigment for use.

[0004]

In order to achieve the above object, the inventors of the present invention have conducted earnest studies and, as a result, have made the size of mica a certain size larger than the conventional size and the amount of metal oxide coating to a certain amount. The effect of reducing the amount of the pearlescent pigment is surprisingly high even if it is not oriented, and a decorative pigment having the properties not found in conventional pearl mica at all angles is exhibited. The present invention has been achieved, and the present invention has been achieved.

That is, according to the present invention, the surface of a mica having a particle diameter of 0.1 to 5 mm is coated with one or more kinds of metal oxide fine particles in an amount of 0.1 to 15% by weight based on the mica, and the orientation is improved. The feature is that it is a decorative pigment that has a brilliant feeling even when viewed from any angle.

The mica used in the present invention may be either synthetic mica or natural mica, but since natural mica contains impurities, it has dullness and the mica itself loses vividness. Therefore, it is particularly preferable to use synthetic mica. When synthetic mica is used, a high whiteness decorative pigment which is not found in conventional decorative pigments of this kind is obtained. Examples of the metal oxide used in the present invention include TiO ₂ , Fe ₂ O ₃ , SnO ₂ , ZrO ₂ , and Cr _2.
O ₃ or V ₂ O _{5 are} preferably used.

[0007] Pigments in which the particle size of the raw material mica and the coating amount of the metal oxide were changed were synthesized, and the properties of the obtained pigment were confirmed.
The results are shown in Table 1 below. Fluorine phlogopite was used as the raw material mica, and titanium dioxide was coated as the metal oxide.

[0008]

[Table-1]

As is clear from the above results, in the present invention, it is necessary that the particle size of mica is 0.1 to 5 mm and the coating amount of the metal oxide fine particles is 0.1 to 15% by weight. However, outside this range, the novel decorative pigment of the present invention cannot be obtained. Further, if the particle size is less than 0.1 mm, the interference force when dispersed in plastic or the like becomes weak, and if the particle size exceeds 5 mm, there is a problem that the strength is weak when used in paints, plastics and the like. The method itself for coating the mica with the metal oxide is known and can be carried out by a known method. The coating amount of the metal oxide can be obtained by analyzing the obtained metal oxide-coated mica by analyzing the amount of metal oxide and the amount of mica, and dividing the amount of metal oxide by the amount of mica.

[0010]

The so-called pearl mica in which mica is coated with a metal oxide is known. However, conventional pearl mica does not have a brilliance feeling unless it is oriented, and only the oriented surface has a brilliance feeling, and the brilliance feeling does not feel like a killer star at all. The novel decorative pigment of the present invention has a specific size in which the particle size of mica is larger than that of conventional pearl mica, and the metal oxide coating amount is within a specific range much smaller than that of the conventional one, and thus oriented. Even if it does not exist, it has a brilliant feeling, and it has a remarkably excellent property which is not seen at all in conventional pearl mica which expresses a brilliant feeling like a shining star when viewed from any angle.

[0011]

EXAMPLES Next, the present invention will be further described with reference to examples, but the present invention is not limited to these examples. Example 1 30 g of fluorine phlogopite (synthetic mica) and water 5 pulverized and classified into a particle size of 0.1 to 1 mm in a 1 liter glass container.
40 ml was added and stirred. Then, in this, a titanyl sulfate solution (TiO ₂ = 80 g / liter) 60
Add milliliter and heat rapidly to 100 ° C.
The reaction was continued at 100 ° C. for 1 hour. After completion of the reaction, filtration,
It was washed with water and dried at 110 ° C. The obtained powder is 800
Firing at 1 ° C. for 1 hour gave a titanium dioxide-coated synthetic mica of the present invention. The obtained synthetic mica exhibited a vivid green color with a glittering star-like sensation when viewed from any angle without orientation. The titanium dioxide coating amount of this synthetic mica was 9.6%. The whiteness of this titanium dioxide-coated synthetic mica was 93. The whiteness was measured by placing the sample in a powder cell, measuring L * a * b * with CR200 (Minolta Camera Co., Ltd.), and calculating the whiteness from this value.

Examples 2 to 5 The titanyl sulfate solution was added in amounts of 50, 40 and 2, respectively.
Titanium dioxide-coated synthetic mica showing blue, magenta, gold and silver, respectively, was obtained in the same manner as in Example 1 except that the amount was 0 or 10 ml. The obtained synthetic mica had a bright color like a shining star, even if it was not oriented and viewed from any angle. The titanium dioxide coverages of this synthetic mica are 8.2, 6.6, 3.4 and 1.7, respectively.
%Met. Example 6 A titanium dioxide-coated synthetic mica was obtained in the same manner as in Example 1 except that fluorine phlogopite having a particle size of 1 to 5 μm was used and 30 ml of a titanyl sulfate solution was used. The obtained synthetic mica exhibited a vivid green color with a glittering star-like sensation when viewed from any angle without orientation. The titanium dioxide coating amount of this synthetic mica was 3.1%.

Example 7 A natural muscovite coated with titanium dioxide was obtained in the same manner as in Example 1 except that natural muscovite having a particle size of 0.2 to 2 μm was used and 30 ml of a titanyl sulfate solution was used. The obtained muscovite exhibited a golden interference color with a glittering star-like sensation when viewed from any angle without orientation.
The titanium dioxide coating amount of this natural muscovite was 3.5%. Example 8 A titanium dioxide-coated natural muscovite was obtained in the same manner as in Example 7 except that the titanyl sulfate solution was changed to 15 ml. The muscovite thus obtained had a silver color with a glittering feeling like a shining star when viewed from any angle without orientation.
The amount of titanium dioxide coated on this muscovite was 1.8%.

Example 9 45 g of the titanium dioxide-coated synthetic mica obtained in Example 6 and 540 ml of water were placed in a 1-liter glass container and stirred. Then, 40 ml of a zirconium dioxide solution (ZrO ₂ = 150 g / liter) was put into this and heated rapidly to 100 ° C. 100 ° C for reaction
It continued for 1 hour. After completion of the reaction, filtration and washing with water
It was dried at ° C. The obtained powder was calcined at 800 ° C. for 1 hour to obtain the zirconium dioxide-coated synthetic mica of the present invention. The obtained synthetic mica exhibited a bright golden color with a glittering star-like sensation when viewed from any angle without orientation. The zirconium dioxide coating amount of this synthetic mica was 8.8%.

Example 10 45 g of the titanium dioxide-coated synthetic mica obtained in Example 6 and 540 ml of water were placed in a 1-liter glass container and stirred. Then, in this, iron sulfate (Fe ₂ O ₃ = 1
40 ml (50 g / l) was added and the mixture was rapidly heated to 100 ° C. The reaction was continued at 100 ° C. for 1 hour. After completion of the reaction, the mixture was filtered, washed with water, and dried at 110 ° C.
The obtained powder was fired at 800 ° C. for 1 hour to obtain the iron oxide-coated synthetic mica of the present invention. The obtained synthetic mica exhibited a vivid bronze color with a glittering star-like sensation when viewed from any angle without orientation. The iron oxide coating amount of this synthetic mica was 9.5%.

Comparative Example 1 In a 1 liter glass container, the particle size was 0.01 to 0.0.
45 g of fluorophlogopite mica crushed and classified to 5 mm and water 540
Add milliliter and stir. Then, 60 ml of a titanyl sulfate solution (TiO ₂ = 80 g / liter) was put into this, and heated rapidly to 100 ° C. The reaction was continued at 100 ° C. for 1 hour. After completion of the reaction, the mixture was filtered, washed with water, and dried at 110 ° C. The obtained powder was calcined at 800 ° C. for 1 hour to obtain a titanium dioxide-coated synthetic mica. The obtained synthetic mica had a titanium dioxide coating amount of 10.0%, but it did not exhibit an interference color, and did not give a glitter feeling unless it was oriented, and only the oriented surface had a glitter feeling. .

Comparative Example 2 A titanium dioxide-coated synthetic mica was obtained in the same manner as in Comparative Example 1 except that the amount of titanyl sulfate solution added was 5 ml. The obtained synthetic mica has a titanium dioxide coating amount of 0.0.
Although it was 5%, no interference color was exhibited, and no glittering feeling was obtained unless it was oriented, and only the oriented surface had a glittering feeling. Comparative Example 3 A titanium dioxide-coated synthetic mica was obtained in the same manner as in Comparative Example 2 except that synthetic mica pulverized and classified to have a particle diameter of 0.1 to 1 mm was used. The titanium dioxide coverage of the obtained synthetic mica was 0.05%, but no interference color was exhibited, and no glittering sensation was obtained without orientation, and only the oriented surface had a glittering sensation.

[0018]

[Effect] As described above, the novel decorative pigment of the present invention has no glittering effect from the conventional decorative pigments of this kind, which shows a glittering feeling like a shining star when viewed from any angle without orientation. It has remarkably remarkable properties. Further, when synthetic mica is used as the mica, it exhibits a high whiteness which is not seen at all in the conventional decorative pigments of this kind.

Claims (3)

[Claims] 1. A surface of a mica having a particle diameter of 0.1 to 5 mm and one or more kinds of metal oxide fine particles in the amount of 0.1 to 15 with respect to the mica.
A decorative pigment, which is characterized by being coated in an amount of% by weight, and which exhibits a brilliant feeling from any angle without orientation. 2. The decorative pigment according to claim 1, wherein the mica is a synthetic mica. 3. The metal oxide is TiO ₂ , Fe
₂ O ₃ , SnO ₂ , ZrO ₂ Cr ₂ O ₃ or V ₂ O ₅
The decorative pigment according to claim 1, which is