JPH0741715A - Oil-base ink - Google Patents

Abstract

PURPOSE:To obtain an oil-base dye ink which is used for an ink pad and a marking pen, does not discolor for a long term, and causes neither blurring nor strike-through by compounding an ether of a mono- and/or a disaccharide. CONSTITUTION:An oil-base ink comprises at least one solvent selected from the group consisting of an alcohol solvent, a glycol solvent, and an arom. solvent, a dye, and an ether of a mono- and/or a disaccharide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is excellent in light resistance and
The present invention relates to an oil-based ink for stamping pads and marking pens that does not cause blurring.

[0002]

2. Description of the Related Art Conventional oil-based inks can be roughly classified into those using a pigment as a coloring material and those using a dye. The former is excellent in light resistance due to the nature of the pigment, but generally has a drawback in that the color development is poor and it is difficult to produce an ink of a desired color. On the other hand, the latter has good color developability and can produce inks of various colors, but generally has poor light resistance, and the fading of the ink is remarkable. This is because the dye causes an oxidation reaction, a chemical reaction, or the like by irradiation with light. Therefore, a dye-based oil-based ink containing an ultraviolet absorber has been proposed, but it has a drawback that it is effective for 1 to 2 days, but after that, it discolors like an ink not containing an ultraviolet absorber. there were. In addition, there is an oil-based ink using a metal complex salt type dye, for example, a chromium complex dye, in order to improve light resistance, but this results in narrowing the range of selection of the dye. In addition, since the ink having alcohol-based solvent, glycol-based solvent, or aromatic solvent as the main solvent has low surface tension, so-called bleeding occurs when imprinted and written on paper, but to prevent this, resin Was an essential requirement. However, depending on the properties of the paper (for example, the state of entanglement of fibers such as cellulose), it may not be possible to prevent bleeding simply by mixing the resin.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a stamp base and a dye-based oil-based ink for a marking pen that does not fade over a long period of time and does not cause bleeding.

[0004]

[Means for Solving the Problems] Alcohol-based solvent, glycol-based solvent, solvent containing aromatic solvent alone or mixed, dye, and monosaccharide ether and / or disaccharide ether are blended. Oil-based ink.

[0005]

The ink of the present invention essentially comprises an organic solvent, a dye, an ether of a monosaccharide and / or an ether of a disaccharide. The solvent used in the ink of the present invention is appropriately selected from alcohol-based, glycol-based and aromatic-based solvents. Examples of alcohol solvents include aliphatic lower alcohols such as ethanol, isopropanol, normal propanol, isobutanol, and normal butanol, and aromatic alcohols such as benzyl alcohol. As the glycol solvent, glycols such as ethylene glycol, propylene glycol, butylene glycol, and triethylene glycol, ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, ethylene glycol monoethyl ether, 3-methoxy-1-
Butanol, ethylene glycol monobutyl ether,
3-methyl-3-methoxy-1-butanol, ethylene glycol monophenyl ether, propylene glycol monomethyl ether, diethylene glycol monomethyl ether, diethylene glycol monobutyl ether, dipropylene glycol monobutyl ether, triethylene glycol monomethyl ether, tripropylene glycol monomethyl ether, etc. Examples include glycol ethers. Examples of the aromatic solvent include aromatic hydrocarbons such as xylene. When used in the ink of the present invention, the above solvents can be used alone or in combination of two or more so that the obtained ink has an appropriate viscosity,
The compounding ratio is 40 to 99% by weight, preferably 50 to 95% by weight in the ink composition.

The dyes used in the ink of the present invention include:
Known direct dyes, acid dyes, basic dyes, disperse dyes, oil-soluble dyes and the like which are soluble in the above-mentioned solvents can be used. When used in the ink of the present invention, these dyes can be used alone or in combination of two or more, and the compounding ratio thereof is 0.5 to 20% by weight, preferably 1 to 1 in the ink composition.
It is preferable to be 5% by weight. When the metal complex salt type dye is used, the light resistance is further improved. Further, even if a pigment is mixed with the ink of the present invention, the effect of the present invention is not impaired, and it can be arbitrarily mixed.

The ether used for imparting light resistance to the ink of the present invention is obtained by dehydrating a monosaccharide or disaccharide and an alcohol. These ethers can be used alone or in combination. Here, the monosaccharides refer to glucose, fructose and the like, and sorbit obtained by reducing these, and the disaccharides refer to maltose type disaccharides such as maltose and lactose, and trehalose type disaccharides such as trehalose and sucrose. Also, alcohol is
Lower alcohols such as propyl alcohol, allyl alcohol and amyl alcohol, higher alcohols such as hexyl alcohol, octyl alcohol and stearyl alcohol, polyhydric alcohols such as hexylene glycol, hexamethylene glycol and dipropylene glycol, butylene glycol monoethyl ether, Glycol ethers such as diethylene glycol monobutyl ether, and cyclic alcohols such as benzyl alcohol, methylphenylcarbinol and cyclohexanol can be used. Further, since the monosaccharide has 5 to 6 hydroxyl groups,
Mono- and hexa-ethers can be obtained, and any of them can be used in the ink of the present invention.
If many hydroxyl groups remain, the affinity with the solvent will decrease, so
Tetra and hexa ethers are preferably used. In addition, since disaccharides have 8 hydroxyl groups, mono- and octaethers can be obtained, and any of them can be used in the ink of the present invention, but if many hydroxyl groups remain, the affinity with the solvent decreases. Therefore, hexa and octa ether are preferably used. When used in the ink of the present invention, the compounding ratio with respect to the total amount of the ink varies depending on the viscosity of each, but 1 to 20% by weight in the composition,
It is preferably 2 to 15% by weight.

It is not clear why the above ether imparts light resistance and prevents bleeding, but it is presumed as follows. (1) When imprinting or writing, a thin film is formed on the surface of the ink to absorb or reflect high-energy light such as ultraviolet rays to suppress the chemical change of the dye, and at the same time, the dyed part is in direct contact with air. To prevent dye oxidation. (2) Since the ester has an appropriate viscosity and an excellent affinity with the solvent, the thin film formed on the ink surface prevents the solvent from diffusing.

The present invention is intended for an imprinted object / written object (coated paper, art paper, high-quality paper, etc.) that absorbs and dries ink, and is made of metal, glass, vinyl, or vinyl-coated paper that does not absorb ink. Since it is out of the scope, it does not require a resin, but it does not hinder the effects of the present invention even if an oil-soluble resin such as a phenol resin, a ketone resin, an acrylic resin, a rosin resin, a nylon resin, or a cellulosic compound is appropriately blended. Absent. Also, dye dissolution aids such as oleic acid, alkyl ether phosphates, and alkyl phosphates, surfactants such as polyoxypropylene glycol, glycerin polyoxypropylene triol, poly (oxyethylene propylene) glycol monoalkyl ether, and glycerides. , PH adjusting agents, antiseptic and antifungal agents, and anticorrosive agents can be appropriately added.

[0010]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The term "part" simply means "part by weight".

Example 1 Ethylene glycol monobutyl ether 30 parts Diethylene glycol monobutyl ether 30 parts C.I. I. Solvent Blue 2 8 parts Sucrose benzyl octaether 4 parts Polyoxyethylene glycol monobutyl ether 8 parts Ricinoleic acid monoglyceride 18 parts Phosphoric acid ester of polyoxyethylene alkyl ether 2 parts Stir the above components at room temperature to obtain a viscosity of 40 cps (25 ° C). )
Of blue ink was obtained.

(Example 2) Ethylene glycol monobutyl ether 30 parts Dipropylene glycol monomethyl ether 30 parts C.I. I. Solvent Blue 2 6 parts C.I. I. Solvent Yellow 34 6 parts Sucrose benzyl octaether 6 parts Glucose cyclohexylpentaether 6 parts Ricinoleic acid monoglyceride 10 parts Oleic acid 6 parts The above components are stirred at room temperature and the viscosity is 50 cps (25 ° C).
Was obtained.

(Example 3) Ethylene glycol monobutyl ether 30 parts Dipropylene glycol monomethyl ether 20 parts Benzyl alcohol 12 parts C.I. I. Solvent Red 1 5 parts Sucrose benzyl octaether 3 parts Solbit benzyl hexaether 3 parts Poly (oxyethyleneoxypropylene) glycol monobutyl ether 8 parts Linoleic acid monoglyceride 16 parts Ketone resin 3 parts The above components are stirred at room temperature to a viscosity of 41 cps. (25 ° C)
Of red ink was obtained.

Example 4 Xylene 65 parts n-Butanol 25 parts C.I. I. Solvent Violet 8 2 parts Sucrose benzyl octaether 6 parts Ethylcellulose 1 part Oleic acid 1 part The above components were stirred at room temperature to obtain a purple ink having a viscosity of 5 cps (25 ° C.).

Example 5 Xylene 65 parts n-Butanol 25 parts C.I. I. Solvent Blue 2 2 parts Sucrose stearyl octaether 6 parts Ethyl cellulose 1 part Oleic acid 1 part The above components were stirred at room temperature to obtain a blue ink having a viscosity of 4 cps (25 ° C.).

(Comparative Example 1) A sucrose benzyl octaether was removed from the components of Example 1 to obtain a blue ink having the same viscosity as that of Example 1.

(Comparative Example 2) A green ink having substantially the same viscosity as that of Example 2 was obtained by removing sucrose benzyl octaether and glucose cyclohexyl pentaester from the components of Example 2.

(Comparative Example 3) A sucrose benzyl octaether and sorbit benzyl hexaether were removed from the components of Example 3 to obtain a red ink prepared to have substantially the same viscosity as that of Example 3.

(Comparative Example 4) A purple ink was prepared in which the sucrose benzyl octaether was removed from the components of Example 4 and the viscosity was substantially the same as that of Example 4.

(Comparative Example 5) A sucrose stearyl octaether was removed from the components of Example 5 to obtain a blue ink having substantially the same viscosity as that of Example 5.

The stamp bases were impregnated with the inks of Examples 1, 2 and 3, and Comparative Examples 1, 2 and 3, and commercially available rubber stamps were applied to coated paper, art paper, and fine paper. Imprinted The marking pens were filled with the inks of Examples 4 and 5 and Comparative Examples 4 and 5 and written on coated paper, art paper, and fine paper. Next, the state of these imprints and writing lines, and the fade meter to 10
The state after irradiation for a period of time was observed. The results are shown below.

[0022]

[Table 1]

From the results shown in (Table 1), the ink of the present invention showed high light resistance even after irradiation with a fade meter. In addition, according to the present invention, an ink capable of imprinting and writing without bleeding could be obtained, but the ink of the comparative example had bleeding.
Furthermore, the ink of the present invention did not cause strike-through, but the inks of Comparative Examples did. The cause of this is not clear, but it seems that it is due to the same reason that the blurring can be prevented.

[0024]

[Effect] As described above, the ink of the present invention contains a monosaccharide ether and / or a disaccharide ether, so that the dye does not fade over a long period of time and does not cause bleeding or strikethrough. Stamp stand,
An oil-based ink for marking pens can be obtained.

Claims (1)

[Claims] 1. An oil-based ink prepared by mixing an alcohol solvent, a glycol solvent, an aromatic solvent alone or a mixture thereof, a dye, and a monosaccharide ether and / or a disaccharide ether.