JP2005048133A - Pigment composition, colorant, and record - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide such a pigment composition for use in colorants as having a high hiding property, a high color developing ability and a high gloss and also as having that color tone of its record which is hardly influenced by a material to be recorded. <P>SOLUTION: The pigment composition is such a pigment composition that contains a coloring pigment and a component showing interference colors and preferably that contains the above coloring pigment with a content larger than a content of the above component showing interference colors. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pigment composition for a colorant having high concealability, high color developability, and high gloss, a colorant using the same, and a recorded matter.

  Features of color pigments contained in colorants such as paints, inks, toners, cosmetics, etc. include high color development, high concealment, high fastness, and low cost. Widely used in agents. However, there are problems such as low gloss and scattering of reflected light.

  As a method for improving the gloss while maintaining the original concealability of the color pigment, there is a method for adding the resin component to the colorant and improving the gloss by the resin component when it is fixed on the recording material. However, in this method, a change in color tone or the like may occur. In this case, it is necessary to select and improve the color pigment according to the change in the color tone. Further, the color tone may change as the resin changes over time.

  Further, as a method of reducing scattering, there is a method of finely dispersing a pigment. Generally, pigment dispersion is performed by applying shearing force with a machine such as a sand mill or a ball mill, but it is not easy to make the average particle size of the pigment large enough not to cause light scattering. Although there is a possibility of improvement by introducing a dispersion machine, the cost is greatly increased in production. In addition, depending on the particle size of the colored pigment, the recorded matter may exhibit other colors in addition to the original color development of the colored pigment. For example, in the case of a cyan ink containing a cyan color pigment, when the particle diameter of the color pigment has a size of about 100 nm or more, a printed matter that exhibits a cyan color is obtained when printed on white paper, When printed on paper, the recorded material may have a reddish cyan color. Obtaining a recorded matter exhibiting a color tone different from a desired color is not preferable in obtaining a high-quality image, for example, a photographic image using a color pigment, and is a technical problem to be solved. The present inventor has come to realize that there is.

In addition, as a component exhibiting an interference color, for example, a pearl pigment that is a pigment in which a surface of a scale-like base material having a high aspect ratio is coated with a substance having a higher refractive index than the base material (for example, Patent Documents 1 and 2). 3 and 4), and fine particles that are extremely small in average particle size and scatter or interfere with light in the visible light wavelength range are known (for example, see Non-Patent Document 1). These exhibit high glossiness and high saturation, and high color stability, but have low concealment properties or do not produce color unless reflected.
JP 2002-256174 A JP-A-8-209024 Japanese Patent Application Laid-Open No. 7-11116 JP-A-6-240172 Proceedings of the 11th Polymer Materials Forum, 2002, p. 269-270

  As described above, the inventors of the present invention have made extensive studies in order to solve the technical problem that the color tone of the recorded matter containing the color pigment may be affected by the color tone of the recording material. The present inventors have found that the above technical problem can be solved by applying a pigment composition, which is a mixture of a colored pigment and a component exhibiting an interference color, to the colorant.

  Accordingly, an object of the present invention is to provide a pigment composition that has a high hiding property, a high color development property, a high glossiness, and gives a colorant having a small influence of the recording material on the color tone of the recorded material, and a coloring agent using the same Another object of the present invention is to provide a recorded material in which the influence of the recorded material is effectively reduced with respect to the color tone.

  The pigment composition which concerns on one aspect | mode of this invention has the characteristics in the point containing the component which exhibits a colored pigment and interference color. By adopting such a constitution of the present invention, it becomes a pigment composition which gives a colorant having high concealing property, high color developability and high gloss and having little influence of the recording material on the color tone of the recording material.

  It is preferable that the content of the color pigment is larger than the content of the component exhibiting the interference color.

  The component exhibiting the interference color is preferably a pearl pigment or fine particles. Further, when the component exhibiting the interference color is a pearl pigment, it is preferably a pigment obtained by coating the surface of the base material with a substance having a higher refractive index than the base material. The base material is preferably at least one selected from mica, silica, and alumina, and preferably has an average particle diameter of 0.01 μm to 100 μm and an aspect ratio of 10 to 300. . The substance having a refractive index higher than that of the base material includes an oxide of one or more substances selected from titanium, iron, cobalt, aluminum, zirconium, zinc, copper, nickel, chromium, tantalum, silicon, and tin. preferable. On the other hand, when the component exhibiting the interference color is a fine particle, the average particle size is preferably a fine particle having an average particle size of 50 nm or more and 300 nm or less, and preferably has at least one of silica, alumina, polystyrene, and polymethyl methacrylate. .

  In addition, the present invention is a colorant containing the above-described pigment composition, and is a recorded matter having a recording portion containing a color pigment and a component exhibiting an interference color.

  Applying the present invention, pigments for colorants such as inks, toners, paints, and cosmetics that have high hiding properties, high color development properties, and high gloss and that have a small effect on the color tone of the recorded materials. It becomes possible to provide a composition.

  The present invention will be described in more detail.

  The pigment composition according to the present invention is characterized by containing a colored pigment and a component exhibiting an interference color.

  As the coloring pigment in the present invention, a general coloring pigment can be used. Specifically, black pigments such as carbon black, acetylene black, lamp black, bone black, graphite, aniline black, zinc yellow, barium chromate, chrome lead, cadmium yellow, ocher, titanium yellow, Hansa yellow, pigment yellow, Yellow pigments such as permanent yellow, red pigments such as bengara, antimony vermillion, permanent red, lake red, rhodamine, alizarin, blue pigments such as ultramarine, bitumen, cobalt blue, phthalocyanine blue, indigo, indanthrene blue, etc. It is done.

  On the other hand, examples of the component exhibiting an interference color include pearl pigments or fine particles.

  The pearl-like pigment is a pigment obtained by coating the surface of a scale-like base material having a high aspect ratio with a substance having a higher refractive index than the base material. The substrate is preferably one or more selected from mica (mica), silica, and alumina. From the viewpoint of transparency and gloss, the average particle diameter of the substrate is preferably 0.01 μm or more and 100 μm or less, more preferably 0.05 μm or more and 30 μm or less. The average particle diameter can be determined using, for example, a laser scattering particle size measuring device (Microtrac). In addition, from the viewpoint of transparency, color tone, and physical strength, the aspect ratio of the substrate is preferably 10 or more and 300 or less, and more preferably 20 or more and 100 or less. The aspect ratio can be obtained from, for example, the ratio of the thickness and the major axis of the substrate observation image by performing observation with a scanning electron microscope. Further, the substance coated on the surface of the base material and having a higher refractive index than the base material is selected from titanium, iron, cobalt, aluminum, zirconium, zinc, copper, nickel, chromium, tantalum, silicon, and tin 1 It is preferable that the oxide of the substance more than a seed | species is included. More preferably, it contains an oxide of one or more substances selected from titanium, iron, zinc, zirconium, and aluminum.

  The fine particles may be organic, inorganic, or composites thereof. From the viewpoint of light diffraction, the average particle size is preferably 50 nm or more and 300 nm or less, and more preferably 100 nm or more and 280 nm or less. Specifically, in view of the refractive index and transparency, from the viewpoint of producing particles having a narrow particle size distribution by a simple method, those having at least one of silica, alumina, polystyrene, and polymethyl methacrylate are preferable. Take as an example. More preferably, it has either silica or polymethyl methacrylate. As the interference color to be exhibited, for example, in fine particles obtained by emulsion polymerization of methyl methacrylate, a bluish color is obtained when the average particle size is around 200 nm, and a yellowish color when the average particle size is around 250 nm. (For example, refer nonpatent literature 1).

  The pigment composition according to the present invention contains a component exhibiting an interference color with the above-described color pigment, and as a combination thereof, the color of the color pigment and the color of the component exhibiting an interference color are similar. Is preferable from the viewpoint of color tone. For example, a pigment composition is formed by combining a cyan color pigment with a blue interference color pigment and a magenta color pigment with a red interference color pigment. The blending ratio is not particularly limited, but it is preferable that the content of the color pigment is larger than the content of the component exhibiting an interference color from the viewpoint of color tone, gloss, and concealment. In this case, high gloss can be imparted while maintaining high concealability and high color developability. More preferably, the content of the color pigment is preferably 2 to 4 times the content of the component exhibiting the interference color. The “content” in the present invention means the mass of the component contained in the pigment composition.

  Such a pigment composition according to the present invention is suitable as a raw material for a colorant having high concealability, high color developability, and high gloss, and having a small influence of the recording material on the color tone of the recorded material, Industrial value is very high.

  The colorant according to the present invention is a liquid or solid containing the above-described pigment composition, and becomes a paint, a coating film, an ink, a toner, or a cosmetic. Examples of the liquid colorant include a solution in which the above pigment composition is dissolved in a solvent, a slurry in which the solvent is dispersed, and the like. The solid colorant may be a powdered pigment composition, or a powdered pigment composition together with a binder [Example: solidified with a binder resin (styrene-acrylate copolymer)] Is mentioned.

  As a solvent used when preparing a liquid colorant, a general aqueous or organic solvent can be used. Furthermore, when an aqueous solvent such as ion-exchanged water is used, it is preferable to use a surfactant so that the pigment composition is stably present in the pigment. Specific examples of the surfactant include a surfactant having an ionic functional group such as sodium dodecylbenzenesulfonate, a nonionic surfactant having polyoxyethylene as a basic skeleton, and the like.

  The color pigments described in Table 1 were prepared as the color pigments, and the components described in Table 2 were prepared as components exhibiting interference colors.

(Example 1)
The following contents were prepared in a sample bottle and stirred and mixed with a magnetic stirrer. The obtained mixed liquid was used as an ink.

・ Coloring pigment A 4g
・ Component 1 exhibiting interference color 1g
・ Nonionic polymer surfactant 5g
(Daiichi Kogyo Seiyaku Co., Ltd., trade name: Epan 785)
-Ion exchange water 90g.

  The obtained ink was applied to a coated paper (manufactured by Canon Inc., trade name: HR-101) using a bar coater (wire bar No. 3) to produce a recorded matter.

  A black solid is printed on the entire surface of the above coated paper using an inkjet printer (manufactured by Canon Inc., trade name: PIXUS 850i) and sufficiently dried (hereinafter referred to as “black solid coated paper”). The above ink was applied using a bar coater (wire bar No. 3) to prepare a recorded matter.

(1) Evaluation of color density and change in color tone As the color density of an image in the obtained recorded matter, the color density of the color pigment used in the desired color tone, that is, the color density as cyan in the colored portion is reflected (X -Rite Inc. 310).

Further, as a change in color tone in the obtained recorded matter, an undesired color tone of the used color pigment, that is, a color density as magenta was measured by the above method, and a colored portion on the coated paper, a colored portion on the black solid coated paper, The difference in color density (ΔOD) was determined and evaluated according to the following criteria.
○: ΔOD is less than 0.05 Δ: ΔOD is 0.05 or more and less than 0.2 x: ΔOD is 0.2 or more.

(2) Glossiness As the glossiness of the image in the recorded matter, the reflectance at 60 ° was measured using a gloss meter (trade name: VG2000, manufactured by Nippon Denshoku Industries Co., Ltd.).

(3) Concealing property As a concealing property in the obtained recorded matter, it was visually evaluated as follows.
○: The base is not visible at all Δ: The base is slightly transparent X: The base is transparent

  The evaluation results are summarized in Table 3.

(Examples 2 to 15)
The coloring pigments used and the components exhibiting interference colors were changed as shown in Table 3, and preparation and evaluation were performed in the same manner as in Example 1. The evaluation results are summarized in Table 3.

(Comparative Example 1)
An ink was obtained by mixing and stirring in the same manner as in Example 1 except that no component exhibiting an interference color was used.

  The obtained ink was applied to coated paper in the same manner as in Example 1 to produce a recorded matter. Also, a recorded matter coated on black solid coated paper was prepared.

  The obtained recorded material was evaluated in the same manner as in Example 1, and the results are summarized in Table 3.

(Comparative Examples 2 to 4)
The color pigments used were changed as shown in Table 3 and were prepared and evaluated in the same manner as in Comparative Example 1. The evaluation results are summarized in Table 3.

(Comparative Example 5)
Except not using a color pigment, it was prepared and stirred in the same manner as in Example 1 to obtain an ink, and this ink was applied to a coated paper in the same manner as in Example 1 to produce a recorded matter. Similarly, a recorded matter coated on black solid coated paper was prepared.

  The obtained recorded material was evaluated in the same manner as in Example 1, and the results are summarized in Table 3.

(Comparative Examples 6-7)
The components exhibiting the interference color to be used were changed as shown in Table 3, and were prepared and evaluated in the same manner as in Comparative Example 5. The evaluation results are summarized in Table 3.

In Examples 1 to 15 and Comparative Examples 1 to 7, the color density and color tone change were evaluated by measuring the color density of the following color tone, respectively.
Examples 1-3, Examples 13-15, Comparative Examples 1, 4-7;
Desired color tone: Cyan Undesired color tone: Magenta Examples 4-9, Comparative Example 2;
Desired color tone: Yellow Undesired color tone: Magenta Examples 10-12, Comparative Example 3;
Desired color tone: Magenta Undesired color tone: Yellow As shown in Table 3 above, in the colorant (ink) containing only the color pigment (Comparative Examples 1 to 4), a change was observed in the color tone of the obtained recorded matter. However, the inks (Examples 1 to 15) in which a component exhibiting an interference color is added to the colorant (Examples 1 to 15) have a very low concealing property, because the ink containing only the component exhibiting the interference color (Comparative Examples 5 to 7) itself is very low. In addition, an excellent result was observed that no difference in color tone of the obtained recorded matter was observed and that the concealability was high.

Claims (12)

  A pigment composition comprising a colored pigment and a component exhibiting an interference color.   The pigment composition according to claim 1, wherein the content of the colored pigment is greater than the content of the component exhibiting the interference color.   The pigment composition according to claim 1 or 2, wherein the component exhibiting the interference color is a pearl pigment.   4. The pigment composition according to claim 3, wherein the pearl pigment is a pigment obtained by coating the surface of a base material with a substance having a higher refractive index than the base material.   The pigment composition according to claim 4, wherein the substrate is one or more selected from mica, silica, and alumina.   The pigment composition according to claim 4 or 5, wherein the average particle diameter of the substrate is 0.01 µm or more and 100 µm or less, and the aspect ratio of the substrate is 10 or more and 300 or less.   The oxide having at least one substance selected from titanium, iron, cobalt, aluminum, zirconium, zinc, copper, nickel, chromium, tantalum, silicon, and tin as the substance having a higher refractive index than the base material. The pigment composition in any one of 4-6.   The pigment composition according to claim 1 or 2, wherein the component exhibiting the interference color is fine particles.   The pigment composition according to claim 8, wherein the fine particles have an average particle diameter of 50 nm or more and 300 nm or less.   The pigment composition according to claim 8 or 9, wherein the fine particles have at least one selected from silica, alumina, polystyrene, and polymethyl methacrylate.   A colorant comprising the pigment composition according to claim 1. A recorded matter comprising a recording portion containing a coloring pigment and a component exhibiting an interference color.