JP3104454B2 - Blue pigment composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blue pigment composition for use in paints, poster colors and the like. In particular, it relates to a blue pigment composition that can be mixed with other colors.

[0002]

2. Description of the Related Art Hitherto, a blue pigment composition has a blue-blue colorant and further contains an extender, a water-soluble polymer and a wetting agent. In the blue pigment composition, the navy blue used is stable on the acidic side, but has a property of discoloring on the alkaline side, and therefore, it is necessary to set the pH to less than 7.

[0003]

The problem is that color mixing with other colors cannot be performed. Generally, a pigment composition used for a color poster color uses calcium carbonate as an extender pigment, and its pH is neutral or alkaline. When a pigment composition using the above navy blue as a pigment in such a pigment composition is mixed for toning, calcium carbonate is decomposed, a change in chromaticity is generated, and a desired color is obtained. There was no problem. To prevent this,
It is necessary to adjust the pH of the composition to 7 or more, and it is conceivable to mix a stable pigment at a pH of 7 or more into a blue pigment composition. However, even if a conventionally known pigment is combined, a composition having a chromaticity equivalent to dark blue cannot be obtained. An object of the present invention is to obtain a blue pigment composition which is a composition having a chromaticity equivalent to that of dark blue and does not cause discoloration even when mixed with a pigment composition of another color.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a copper phthalocyanine.
Ninblue (C.I. 74160), cobalt phthalocyanine
Ninblue (CI. 74140), metal-free phthalocyanine
Blue (CI. 74100), Indanthrene Blue
RS (CI. 69800), Indanthrene Blue BC
A blue pigment selected from (CI. 69825);
Sagin Violet (CI. 51319), Isoviola
Cthlon Violet (CI. 60010), Methylba
Iolet lake (CI. 42535), indance lake
Brilliant Violet 3B (CI. 60005)
A blue pigment composition containing at least a purple pigment selected from the group consisting of calcium carbonate having an average particle diameter of 1 to 3 μm, a water-soluble polymer, a wetting agent and water.

Hereinafter, the present invention will be described in detail. Blue pigments include copper phthalocyanine blue (CI 74160), cobalt phthalocyanine blue (CI 74140), metal-free phthalocyanine blue (CI 74100), and indanthrene blue RS (CI 69800). , Selected from Indanthrene Blue BC (CI. 69825)
Is used. The amount used is preferably 3 to 20% by weight, particularly preferably 3 to 10% by weight, based on the total amount of the blue pigment composition. The purple pigment is dioxazine violet (CI.5).
1319), isobiolanthrone violet (C.I.
60010), methyl violet lake (CI.42)
535), indanthrene brilliant violet 3
B (C.I. 60005) . The amount is preferably 0.1 to 1% by weight based on the indigo pigment composition.

Calcium carbonate is used as an extender, but it is necessary to use calcium carbonate having an average particle size of 1 to 3 μm. If the average particle size is small, the lightness increases and the color sharpness decreases, and if the average particle size is large, the lightness decreases and the color sharpness decreases, which impairs the color development of the coloring material. Is not equivalent to The use amount is preferably from 10 to 40% by weight, particularly preferably from 20 to 30% by weight, based on the cyan pigment composition.

The water-soluble polymer is used as a fixing agent and a vehicle. Glue, gum arabic, natural water-soluble polymers such as dextrin and carboxymethylcellulose,
Semi-synthetic water-soluble polymers such as hydroxyethyl cellulose,
Synthetic water-soluble polymers such as polyvinyl alcohol can be used, and the amount used is 5 to 20 with respect to the total amount of the indigo pigment composition.
% By weight is preferred.

[0008] The wetting agent is used as a deicing agent, a re-dissolving property improving agent and the like, and examples thereof include glycerin, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, sorbitol and sorbitan.

Water is used as the main solvent.

[0010] In addition to the above components, if necessary, a preservative,
Additives such as a fungicide, a rust preventive and an antifoaming agent may be used as appropriate.

The blue 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.

[0012]

The blue pigment composition according to the present invention not only approximates the navy blue color but also has an average particle diameter of 1 by using the above specific blue pigment and purple pigment as coloring materials. By using 炭 酸 3 μm of calcium carbonate, the hue and saturation are both close to dark blue, and the chromaticity is equivalent to dark blue. In addition, since the above specific blue pigment and violet pigment are stable ones having a neutral or alkaline pH and no discoloration, the pH of the pigment composition can be set to a neutral to alkaline, so that the other colors can be used. No discoloration occurs even when mixed with the pigment composition.

[0013]

Embodiments will be described below. Although all the embodiments are shown with watercolors, the present invention is not limited to this. Example 1 Copper phthalocyanine blue (C.I. 74160) 7 parts by weight Dioxazine violet (C.I. 51319) 0.3 parts by weight Calcium carbonate (average particle diameter 1.5 μm) (C.I. 77220) 30 parts by weight Part Arabic gum 15 parts by weight Dextrin 7 parts by weight Glycerin 6 parts by weight Water 27 parts by weight Preservative 0.5 part by weight After putting the above components in a lab mixer and stirring for 15 minutes,
The mixture was passed through a three-roll mill three times to obtain a blue watercolor.

Example 2 Cobalt phthalocyanine blue (C.I. 74140) 7 parts by weight Indanthrene brilliant violet 3B (C.I. 60005) 0.3 part by weight Calcium carbonate (average particle diameter 2.2 μm) (C.I. I. 77220) 30 parts by weight Gum arabic 15 parts by weight Dextrin 7 parts by weight Glycerin 6 parts by weight Water 27 parts by weight Preservative 0.5 parts by weight
The mixture was passed through a three-roll mill three times to obtain a blue watercolor.

Example 3 Indanthrene Blue RS (CI. 69800) 6 parts by weight Methyl Violet Lake (CI. 42535) 0.5 part by weight Calcium carbonate (average particle size 1.5 μm) (CI) .77220) 30 parts by weight Gum arabic 15 parts by weight Dextrin 7 parts by weight Glycerin 3 parts by weight Ethylene glycol 3 parts by weight Water 27 parts by weight Preservatives 0.5 part by weight
The mixture was passed through a three-roll mill three times to obtain a blue watercolor.

Example 4 Copper phthalocyanine blue (C.I. 74160) 7 parts by weight Dioxazine violet (C.I. 51319) 0.5 parts by weight Calcium carbonate (average particle diameter 1.1 μm) (C.I. 77220) 30 parts by weight Gum arabic 15 parts by weight Dextrin 7 parts by weight Glycerin 6 parts by weight Water 27 parts by weight Preservative 0.5 parts by weight
The mixture was passed through a three-roll mill three times to obtain a blue watercolor.

Comparative Example 1 (target color) Navy blue (CI. 77510) 30 parts by weight Clay (CI. 77004) 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 Part preservative 0.5 parts by weight Put the above ingredients in a lab mixer, stir for 15 minutes,
The mixture was passed through a three-roll mill three times to obtain a blue watercolor.

Comparative Example 2 Example 1 was repeated except that the average particle size of calcium carbonate (CI. 77220) of Example 1 was changed from 1.5 μm to 0.3 μm.
In the same way as above, indigo paint was obtained.

Comparative Example 3 Example 1 was repeated except that the average particle size of calcium carbonate (CI. 77220) was changed from 1.5 μm to 5.0 μm.
In the same manner as above, indigo paint was obtained.

Tests were performed on the blue watercolors obtained in Examples 1 to 4 and Comparative Examples 1 to 3. Table 1 shows the results. In addition, the watercolor paint obtained in Comparative Example 3 was inferior in touch as compared with Examples 1 to 4 and Comparative Examples 1 and 2 when the surface of the drawing paper was painted with a paintbrush in the following test.

[0021]

[Table 1]

* 1 Hue, Saturation The watercolor paint obtained in the above Examples and Comparative Examples was mixed with water at a weight ratio of 1: 1 and painted on a drawing paper with a paintbrush. Hue (ΔH) and chroma (ΔC) were measured with a computer (SM-4; manufactured by Suga Test Instruments Co., Ltd.), and compared with those using dark blue, and determined. Hue ◎: No hue difference (ΔH = 6.81PB ± 0.1
○: almost no hue difference (ΔH = 6.81PB ± 0.1)
Δ: slightly different hue difference (ΔH = 6.81 PB ± 0.5)
×: There is a hue difference (ΔH = 6.81 PB ± 1.0)
Saturation ◎: No saturation difference (△ C = 7.77 ± 0.5) ○: Almost no saturation difference (差 C = 7.77 ± 0.5 or more)
1.0) Δ: Slight difference in saturation (ΔC = 7.77 ± 1.0 ~
1.5) ×: Saturation difference (ΔC = 7.77 ± 1.5 or more)

* 2 Discoloration test A mixture of the watercolor paints obtained in the above Examples and Comparative Examples and water at a weight ratio of 1: 1, and a mixing pigment composition (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 part by weight of a preservative were put into a lab mixer, and stirred for 15 minutes. A mixture of a yellow-colored watercolor paint obtained by passing through the roll mill three times and a mixture of water at a weight ratio of 1: 1 is mixed, and the drawing paper is coated on the drawing paper with a paintbrush.
After standing for a month, the presence or absence of discoloration was visually determined. ○: no discoloration ×: discoloration

[0024]

As described above in detail, the indigo pigment composition according to the present invention has the same chromaticity as that using blue blue and is mixed with the pigment composition of another color. No discoloration occurs. Further, when used as a watercolor paint or the like and applied or drawn, it is also excellent in other characteristics relating to the quality of the watercolor paint, such as coloring properties, concealing properties, and spreading.

Continued on the front page (51) Int.Cl. ⁷ Identification code FI C09D 5/06 C09D 5/06 17/00 17/00

Claims (1)

(57) [Claims] (1) Copper phthalocyanine blue (CI. 741)
60), cobalt phthalocyanine blue (CI. 741)
40), metal-free phthalocyanine blue (CI. 7410)
0), Indanthrene Blue RS (CI. 6980)
0), Indanthrene Blue BC (CI 69825)
Blue pigment selected from dioxazine violet
(CI. 51319), Isobiolanthrone Violet
(CI. 60010), methyl violet lake
(C.I. 42535), Indreshren Brilliantova
Purple selected from iolet 3B (CI. 60005)
Pigment, calcium carbonate having an average particle size of 1 to 3 μm,
An indigo pigment composition comprising at least a water-soluble polymer, a wetting agent, and water.