JPH06248221A - Indigo pigment composition - Google Patents

Abstract

(57) [Summary] [Structure] A coloring material comprising 3 to 30% by weight of a blue pigment such as copper phthalocyanine blue and cobalt phthalocyanine blue and 0.1 to 2% by weight of a purple pigment such as dioxazine violet, and a single particle diameter of 30 μm. It contains 1 to 10% by weight of the following amorphous silica, 5 to 20% by weight of a water-soluble polymer such as glue and gum arabic, a wetting agent such as ethylene glycol and glycerin, and water. [Effect] It has the same hue as dark blue and high saturation, and does not change color when mixed with other colors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indigo pigment composition which is used for paints, poster colors and the like and which requires high saturation and can be mixed with other colors.

[0002]

2. Description of the Related Art Hitherto, indigo pigment compositions have used navy blue as a coloring material, a water-soluble polymer, an extender pigment and a wetting agent. The navy blue used in this indigo pigment composition contains ferric ferrocyanide as a main component and is stable on the acidic side, but has the property of discoloring on the alkaline side. Therefore, it is necessary to set the pH of the indigo pigment composition using navy blue as a coloring material to less than 7.

[0003]

This is a change in color when mixed with other colors such as paints and poster colors. Generally, a pigment composition used for a paint poster color or the like uses calcium carbonate as an extender pigment and has a pH of neutral to alkaline. When such a pigment composition is mixed with a pigment composition using dark blue as the coloring material,
Since the pH of the whole after mixing changes, dark blue and calcium carbonate change, and the color changes easily immediately after mixing and after aging. However, when a mixture of other colored pigments is simply used as a navy blue substitute pigment, the saturation is too low to be used for paints, poster colors, etc., and there is a problem that it cannot be practically used. An object of the present invention is to provide an indigo pigment composition that does not cause discoloration due to color mixing, and to provide an indigo pigment composition that does not use navy blue and has a saturation equal to or higher than navy blue. .

[0004]

Means for Solving the Problems The present invention is directed to a coloring material comprising a blue pigment and a violet pigment having a neutral or alkaline pH and stability, amorphous silica having an average single particle diameter of 30 μm or less, and a water-soluble polymer. And a blue pigment composition comprising at least a wetting agent.

The present invention will be described in detail below. As the coloring material, a blue pigment and a purple pigment are used together. It is necessary that the pH of the blue pigment and the violet pigment be neutral to alkaline and stable. Blue pigments include copper phthalocyanine blue (CI74160), cobalt phthalocyanine blue (CI74140), metal-free phthalocyanine blue (CI74100), and indanthrene blue RS.
(C.I.69800), Indanthren Blue BC
(C.I. 69825) and the like. The amount used is preferably 3 to 30% by weight based on the total amount of the cyan pigment composition.
The purple pigment is dioxazine violet (C.I. 513
19), Isoviolanthrone Violet (C.I. 60
010), methyl violet lake (C.I.
5), Indanthrene Brilliant Violet 3B
(C.I.60005) and the like, and the amount thereof is preferably 0.1 to 2% by weight based on the cyan pigment composition.

Amorphous silica is used as an extender pigment, but it is necessary to use one having an average single particle diameter of 30 μm or less. When the average single particle diameter exceeds 30 μm, the lightness decreases and the saturation decreases, and the coloring of the coloring material is impaired, so that the chromaticity of the pigment composition does not become the same as that of navy blue. The composition cannot be used as a paint or a poster color that requires high saturation. If the average single particle size is too small, the lightness tends to increase and the saturation tends to decrease. Therefore, the average single particle system is preferably 1 μm or more. Amorphous silica is used in an amount of 0.1 to 20% by weight, particularly 0.5 to
10% by weight is preferred.

The water-soluble polymer is used as a fixing agent and a color-developing agent, and is a natural water-soluble polymer such as glue, gum arabic or dextrin, or a semi-synthetic water-soluble polymer such as carboxymethyl cellulose or hydroxyethyl cellulose. , A synthetic water-soluble polymer such as polyvinyl alcohol can be used, and the amount thereof is 5 to 2 with respect to the total amount of the cyan pigment composition.
0% by weight is preferred.

The wetting agent is used as an antifreezing agent, a re-solubility improving agent and the like, and examples thereof include glycerin, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, sorbitol and sorbitan.

In addition to the above components, if necessary, additives such as antiseptic / antifungal agents, rust preventives, and defoaming agents may be appropriately used.

The indigo pigment composition of the present invention can be easily obtained by mixing and dispersing the above components with a disperser such as a three-roll mill or a horizontal ball mill.

[0011]

In the indigo pigment composition according to the present invention, by using a blue pigment and a purple pigment as a coloring material, not only can the hue of dark blue be approximated, but also as an extender pigment used for adjusting the hiding power and state, By using amorphous silica having an average single particle diameter of 30 μm or less, it is possible to obtain a coating mark with high saturation. Moreover, the blue pigment and the purple pigment are
Since the pigment having a neutral to alkaline and stable pH is used, the pH of the pigment composition can be set to be neutral to alkaline, so that discoloration does not occur even when the pigment composition is mixed with other pigment compositions.

[0012]

EXAMPLES Examples will be described below. Although all the examples are shown in watercolors, the present invention is not limited to this.

Example 1 Copper phthalocyanine blue (CI.74160) 16 parts by weight Dioxazine violet (CI.51319) 0.3 parts by weight Amorphous silica (CI.77811, average single particle diameter 15 μm) 5 parts by weight Gum arabic 15 parts by weight Dextrin 7 parts by weight Glycerin 11 parts by weight Water 45 parts by weight Preservative 0.5 parts by weight After putting the above ingredients in a lab mixer and stirring for 15 minutes,
Three-roll milling was repeated three times to obtain indigo watercolor paint.

Example 2 16 parts by weight of cobalt phthalocyanine blue (CI.74140) 0.3 part by weight of indanthrene brilliant violet 3B (CI.60005) amorphous silica (CI.77811, average single particle) Diameter 20 μm) 5 parts by weight Gum arabic 15 parts by weight Dextrin 7 parts by weight Glycerin 11 parts by weight Water 45 parts by weight Preservative 0.5 parts by weight After adding the above ingredients to a lab mixer and stirring for 15 minutes,
Three-roll milling was repeated three times to obtain indigo watercolor paint.

Example 3 Indanthrene blue RS (CI.69800) 6 parts by weight Methyl violet lake (CI. 42535) 0.5 parts by weight Amorphous silica (CI.77811, average single particle diameter) 3 μm) 5 parts by weight Gum arabic 15 parts by weight Dextrin 7 parts by weight Glycerin 6 parts by weight Ethylene glycol 5 parts by weight Water 45 parts by weight Preservative 0.5 parts by weight After adding the above ingredients to a lab mixer and stirring for 15 minutes,
Three-roll milling was repeated three times to obtain indigo watercolor paint.

Comparative Example 1 (Standard color) Dark blue (CI.77510) 30 parts by weight Clay (CI.77005) 20 parts by weight Arabic gum 6 parts by weight Dextrin 10 parts by weight Glycerin 4 parts by weight Water 18 parts by weight Preservative Agent 0.5 parts by weight The above ingredients are put in a lab mixer and stirred for 15 minutes.
Three-roll milling was repeated three times to obtain indigo watercolor paint.

Comparative Example 2 Calcium carbonate (C.I. 77220, average particle size 1.5 μm) except for 5 parts of amorphous silica (C.I. 77811, average single particle size 15 μm) and 18 parts of water of Example 1 was used. ) 30
An indigo watercolor paint was obtained in the same manner as in Example 1 except that parts were added.

Comparative Example 3 The procedure of Example 1 was repeated except that the amorphous silica of Example 1 (C.I. 77811, single particle diameter 15 μm) was replaced with amorphous silica having an average single particle diameter of 40 μm. Got the watercolor paint.

The indigo watercolor paints obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were tested. The results are shown in Table 1.
Shown in.

[0020]

* 1 Hue, Saturation The watercolor paints obtained in the above-mentioned Examples and Comparative Examples and water were mixed at a weight ratio of 1: 1 and the surface of the drawing paper was painted with a writing brush. Hue (ΔH) and saturation (ΔC) by computer (SM-4; manufactured by Suga Test Instruments Co., Ltd.)
Was measured and compared with that using dark blue to evaluate. Hue: No hue difference (ΔH = 6.81PB ± 0.1 or less) Δ: Almost no hue difference (ΔH = 6.81PB ± 0.1 to 0.5) ×: Hue difference (ΔH = 6.81PB ± 0.5 or more) Saturation ○: High saturation (ΔC = 7.77 + 0.1 or more) Δ: Almost no difference in saturation (ΔC = 7.77 ± 0.1) ×: Saturation Low (△ C = 7.77-0.1 or less)

* 2 Discoloration test A mixture of the watercolor paints obtained in the above Examples and Comparative Examples and water in a weight ratio of 1: 1 was mixed with a pigment composition for mixing (10 parts by weight of Hansa Yellow 10G, calcium carbonate). 30 parts by weight, 15 parts by weight of gum arabic, 6 parts by weight of glycerin, 38.5 parts by weight of water, and 0.5 parts by weight of preservative were added to a lab mixer and stirred for 15 minutes. Lemon-yellow watercolor paint obtained by passing three times through this roll mill and water mixed at a weight ratio of 1: 1 are mixed, and the surface of the drawing paper is painted with a drawing brush at 50 ° C, 1 ° C.
After leaving for a month, the presence or absence of discoloration was visually determined. ○: No discoloration ×: Discoloration

[0023]

As described above in detail, the indigo pigment composition according to the present invention has the same hue as that using dark blue, and has an excellent coloring with a higher saturation than dark blue. In addition, it does not cause discoloration when mixed with a pigment composition of another color. When used as a watercolor paint or a poster color and applied or drawn, it is also excellent in other characteristics related to the quality of the watercolor paint or the poster color such as hiding power and spread.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C09D 5/06 PPW 6904-4J

Claims (1)

[Claims] Blue-colored pigment composition comprising at least a neutral or alkaline pH stable blue pigment and a purple pigment, amorphous silica having an average single particle diameter of 30 μm or less, a water-soluble polymer, and a wetting agent .