JP2008056836A - Solid drawing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid drawing material having a preferable dispersion property and a higher strength, providing the external appearance and the drawing line of a pigment color, without stimulative odor as in the conventional configuration. <P>SOLUTION: The solid drawing material is made of at least a forming material including wax, gellant and clay, and a coloring material. Sepiolite is added as a dispersing agent in addition to the materials, and as needed, a body material, an organic solvent, and the like may also be added. The addition amount of the sepiolite is preferably in a range of 0.005 to 3% by weight, and particularly preferably in a range of 0.1 to 2% by weight with respect to the solid drawing material total amount. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a solid drawing material having high strength, a uniform appearance and a clear color tone, and excellent as an image material.

Ingredients used in solid drawing materials such as crayons include pigments and other colorants, and waxes and other forming materials are used as basic main materials. In addition to these, constitutional materials, water as a solvent, and organic solvents Further, dispersants, preservatives, antifungal agents, viscosity modifiers and the like are used as additive components. However, in the conventional configuration, there are subtle problems as an art material, for example, there is a problem in strength because it is only hardened with wax, etc. It seems to be a little dull when viewed from the color. In this regard, various constituent materials have been examined, and it has been found that the use of a dispersant is part of this problem. That is, in order to improve the dispersibility of each component, the use of a dispersant is indispensable, and surfactants such as nonions and cations have been mainly used as the material. By this surfactant, pigments and the like are uniformly dispersed in a forming material such as wax, and a preferable solid drawing material having a stable image color can be obtained (see Patent Document 1).
JP 2005-206774 A

  However, the following problems occur when a surfactant is used. (1) Since the surfactant itself has a color, the appearance of the image line and the solid drawing material tends to become duller than the original color tone of the coloring material as described above. (2) In order to bring about a sufficient dispersion effect, for example, as described in Patent Document 1, it is necessary to add, for example, around 5 to 10% by weight of the whole. Inevitable. Conversely, if the addition amount is reduced, the dispersion effect will be inferior and the degree of dispersion will be uneven. (3) In addition to the above problems, the surfactant has a peculiar irritating odor, and particularly when the addition amount is large, it remains in the product itself. Although this disappears with time, the pungent odor initially causes discomfort to the user for a while.

  The present invention relates to a solid drawing material having high strength and a uniform appearance and a clear color tone. The first gist is to add sepiolite in addition to at least a coloring material and a forming material.

  Moreover, let the 2nd summary that the addition amount of a sepiolite exists in the range of 0.005 to 3 weight% with respect to the solid drawing material whole quantity.

  The solid drawing material of the present invention has a high degree of dispersion while exhibiting a degree of dispersion comparable to that of the conventional one, and the solid drawing material has a clear color appearance that is close to the coloring material itself in appearance and color tone, and has a unique irritating odor. And has excellent characteristics as an art material.

  The solid drawing material of the present invention achieves the object of ensuring good color development and appearance as well as dispersion effect by adding sepiolite at least in addition to the forming material and the colorant.

  Next, the solid drawing material of the present invention will be specifically described. The forming material is for maintaining the shape as a solid drawing material, and examples thereof include wax, gelling agent, and clay. As the wax, any conventionally known wax may be used, and specifically, carnauba wax, wood wax, beeswax, microcrystalline wax, montan wax, candelilla wax, low molecular weight polyethylene, paraffin wax and the like. Can be mentioned. As the gelling agent, conventionally known ones such as aqueous gelling agents and oily gelling agents can be used. For example, fatty acids such as 12 hydroxystearic acid, dibenzylidene sorbitols, tribenzylidene sorbitols, amino acid oils, Examples include alkali metal salts of fatty acids. Examples of clay minerals include bentonite and montmorillonite. The above materials are used alone or in combination. As a compounding quantity of a forming material, the range of 10 to 50 weight% is preferable with respect to the solid drawing material whole quantity. If it is less than 10% by weight, the strength is lowered, and if it is 50% by weight or more, it is hard and the drawing property is poor.

  As the coloring material, any conventionally known pigment or dye can be used. Examples of the pigment include inorganic pigments, organic pigments, white pigments, pearl pigments, metal pigments, and fluorescent pigments, which can be used alone or in combination. Use. Specific examples of the inorganic pigment include carbon black, iron black, ultramarine blue, and petal, and examples of the organic pigment include azo pigments, indigo pigments, phthalocyanine pigments, quinacridone pigments, and thioindigo pigments. Examples of white pigments include titanium oxide and zinc oxide, and examples of fluorescent pigments include daylight fluorescent pigments and phosphorescent pigments. As the dye, an oil-soluble dye can be particularly preferably used, and examples thereof include known dyes such as phthalocyanine dyes, pyrazolone dyes, nigrosine dyes, anthraquinone dyes, and azo dyes. The blending amount of the coloring material is preferably 1 to 50% by weight with respect to the total amount of the solid drawing material. In addition, you may add bright pigments, such as a metal foil pigment and a glass flake pigment, as a pigment.

Sepiolite used in the present invention is a porous clay mineral, and its composition is hydrous magnesium silicate. The chemical structural formula is represented as Mg ₈ (OH) ₄ Si ₁₂ O ₃₀ (H ₂ O) ₁₂ . As a major feature of sepiolite, porous and needle-like particles are formed, so that it has excellent adsorptivity and rheology, and has an excellent anti-settling effect and thus an excellent dispersion effect. In particular, the use of sepiolite has a feature that an excellent dispersion effect can be obtained even with a small amount of addition over a conventional surfactant. Therefore, it is possible to study a solid drawing material having a higher strength than the conventional one, and although it is light yellow, it is effective even if the amount is small, so it hardly affects the color of the coloring material itself, and the interface An excellent solid drawing material having no irritating odor as compared with the activator becomes possible.

  By using this material, the dispersibility is excellent even in a small amount, and as a result, a good solid drawing material can be obtained. The preferred feature is the above-mentioned glitter pigment, that is, a metal foil pigment, a glass flake pigment, or a pearl pigment. When a pigment having a high specific gravity such as a metal pigment is used, it is particularly noticeable in terms of performance, such as being uniformly dispersed in the solid drawing material. The amount of sepiolite added is preferably 0.005 to 3% by weight, particularly 0.1 to 2% by weight, based on the total amount of the solid drawing material. If it is less than 0.005% by weight, it is difficult to obtain a dispersion effect, and if it is 3% by weight or more, the viscosity at the time of mixing the materials increases and the fluidity decreases, so that the production of the solid drawing material itself tends to be difficult.

  In addition to the above components, an extender may be added. Specific examples include talc, clay, silica, calcium carbonate, alumina, mica, potassium titanate, glass flake, corn starch, starch, boron nitride and the like, and talc and calcium carbonate are particularly preferable. Further, a resin as an adhesive may be added. Specifically, synthetic resins and natural resins are used. For example, polyvinyl chloride, polyvinyl acetate, rosin ester, terpene, nitrocellulose, polyvinyl alcohol, polyethylene, Examples include acrylic amide. Moreover, water, an organic solvent, etc. can be used as a solvent. In addition, a viscosity adjuster, a fungicide, an antiseptic, an antibacterial agent, a fragrance and the like may be added as necessary.

  As a method for producing a solid drawing material of the present invention, a forming material and a solvent are mixed and heated to dissolve, followed by further adding a coloring material, sepiolite and an extender as necessary, and filling into a predetermined mold. Then, it is cooled and solidified, and taken out from the mold to obtain a cylindrical solid drawing material. Next, examples of the present invention will be described. “Parts” is “parts by weight”.

Carnauba wax 8 parts 12-hydroxystearic acid 28 parts Polypropylene glycol (molecular weight 1000) 48 parts Colorant (azo pigment ... yellow) 15 parts Sepiolite 1 part
(PANGEL B-20: manufactured by Enomoto Kasei Co., Ltd.)
Using the above materials, the mixture was heated and mixed at 95 ° C., and the resulting liquid was poured into a mold having an inner diameter of 8 mm, cooled and solidified to obtain a yellow solid drawing material having a diameter of 8 mm and a length of 60 mm. This solid drawing material is high in strength, and the appearance and color tone of the image line are almost the same as that of the pigment itself, and there is no irritating odor.

  The material of Example 1 was further mixed with 10 parts of a metallic foil pigment, which was a glitter pigment, and a solid drawing material was obtained in the same process as in Example 1. In this solid drawing material, in addition to the characteristics of Example 1, the metal foil pigment was uniformly dispersed without unevenness.

(Comparative Example 1)
Instead of 1 part of sepiolite of Example 1, 10 parts of a surfactant (polyoxyethylene alkyl ether) was used to obtain a yellow solid drawing material. This solid drawing material has a slightly low strength, and the appearance and color tone of the image line are dull compared to the color of the pigment itself.

(Comparative Example 2)
In Example 2, 10 parts of a surfactant (polyoxyethylene alkyl ether) was used instead of 1 part of sepiolite to obtain a yellow solid drawing material. In this solid drawing material, in addition to the problem in Comparative Example 1, the metal foil pigment was unevenly biased to the lower portion of the solid drawing material during production.

(Comparative Example 3)
In Example 1, a yellow solid drawing material was obtained using 1 part of a surfactant (polyoxyethylene alkyl ether) instead of sepiolite. This solid drawing material has good strength, but the dispersion is not sufficient, the pigment is non-uniform and slightly biased, and there is a slight irritating odor.

  The above Examples 1 and 2 and Comparative Examples 1, 2 and 3 were compared in terms of dispersibility, bending strength, appearance, image line, and presence or absence of an irritating odor. The dispersibility, the appearance of the solid drawing material and the image line were visually observed, and the bending strength was measured according to JIS-S-6026. The unit is g. The results are shown in Table 1.

  As is apparent from Table 1, the solid drawing material of the present invention has excellent characteristics such as excellent dispersibility, high strength, appearance and streak color, and no irritating odor. I understand.

  As a color material, the appearance and the image line have a pigment color and stable use such as no irritating odor is possible.

Claims (2)

  A solid drawing material comprising at least a forming material and a coloring material, and sepiolite added to the material.   The solid drawing material according to claim 1, wherein the amount of sepiolite added is in the range of 0.005 to 3% by weight with respect to the total amount of the solid drawing material.