JPH0741713A - Oil-base ink for ink pad - Google Patents

Abstract

PURPOSE:To obtain an oil-base ink for an ink pad which neither blurs nor penetrates through an absorbent paper and has an improved light resistance by compounding an alcohol or glycol solvent, a dye, and a specific additive. CONSTITUTION:The ink is prepd. by compounding 40-90wt.% alcohol and/or glycol solvent, 1-20wt.% dye (e.g. a direct dye, an acidic dye, a basic dye, or a disperse dye), and 20-40wt.% additive prepd. by mixing 10-20wt.% benzoic ester of trehalose-type biose, 25-40wt.% polyethylene polypropylene glycol alkyl ether, and 50-75wt.% monoglyceride.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dye-based oil base ink for stamp bases, which is intended for imprinting coated paper, art paper, fine paper, etc. (hereinafter collectively referred to as "absorbent paper") that absorbs ink. Regarding

[0002]

2. Description of the Related Art Conventional inks for stamp boards 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 a chemical reaction such as oxidation, reduction, and polymerization when irradiated 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 ink using a metal complex salt type dye, for example, a chromium complex dye in order to improve the light resistance, but this results in narrowing the selection range of the dye. In addition, as another ink classification method,
Solvents can be broadly classified into water-based ones and oil-based ones. The water-based ones are mainly targeted for imprinting on high-quality paper, and are colored by absorbing and drying the ink. Also, from the characteristics of the solvent,
It has the excellent property that the board surface of the stamp stand does not dry. However, for coated paper or the like whose surface is coated with titanium oxide or the like, the absorption of ink is extremely slow and not only stains the fingers but also stains other documents, making it practically unusable. On the other hand, oily substances can be further classified into those of volatile organic solvents and those of non-volatile organic solvents. The oil-based ink made of a volatile organic solvent is one in which the solvent volatilizes immediately after imprinting and the colorant is fixed by the resin, so it seems that the object to be imprinted does not seem to be selected. But,
The penetrating power is excessive for coated paper, high-quality paper, etc.
There were noticeable bleeding and strikethrough, and it was very unusable. In addition, if you leave the stamp stand with the lid open or if the stamp stand is not completely sealed,
The board surface dried in a short time, and it was often impossible to imprint. In such a case, the user had to drop the solvent and redissolve the dye or resin before use, which was inconvenient. The oil-based ink consisting of a non-volatile organic solvent has high viscosity, so there is almost no bleeding or strike-through, and it has the excellent property that the surface of the board does not dry, but with coated paper whose surface is coated with titanium oxide, etc. Was absorbed very slowly and not only soiled fingers and other documents, but was virtually unusable.

[0003]

Therefore, it is possible to freely select dyes without worrying about light resistance, and to quickly absorb various kinds of absorbent paper without causing bleeding or strikethrough.
There has been a demand for an oil-based ink that does not dry the board surface in a short time even if the lid of the stamp stand is left open. As a result of diligent research, the inventor of the present application succeeded in finding a dye-based oil-based ink for a stamp table that overcomes the above-mentioned drawbacks by using a specific additive.

[0004]

Means for Solving the Problems An oil-based ink for a stamp stand, which comprises an alcohol solvent, a solvent in which a glycol solvent is used alone or a mixture thereof, and a dye, and a benzoate of trehalose type disaccharide, and polyethylene polypropylene An oil ink for a stamp stand, which is prepared by mixing an additive consisting of glycol alkyl ether and monoglyceride.

[0005]

The ink of the present invention contains volatile solvents, dyes and specific additives as essential constituent elements. The solvent used in the ink of the present invention is appropriately selected from alcohols and glycols. 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. 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, and the compounding ratio thereof is 40 to 90% by weight in the ink composition. Preferably 45-80
% By weight.

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 1 to 20% by weight, preferably 2 to 15% by weight in the ink composition. Good. 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 specific additive used in the ink of the present invention is an additive consisting of benzoic acid ester of trehalose type disaccharide, polyethylene polypropylene glycol alkyl ether, and monoglyceride. Hereinafter, each component will be described in detail. Benzoic acid ester of trehalose type disaccharide The benzoic acid ester of trehalose type disaccharide refers to an ester of trehalose type disaccharide such as trehalose and sucrose and a benzoic acid ester. Here, since the disaccharide has 8 hydroxyl groups, it is possible to obtain mono- and octa-esters,
Any of these can be used in the ink of the present invention, but if a large amount of hydroxyl groups remain, the affinity with other components decreases, so hexa- and octa-esters are preferably used. Polyethylene polypropylene glycol alkyl ether Polyethylene polypropylene glycol alkyl ether refers to a product obtained by addition-polymerizing propylene oxide and ethylene oxide to a linear or side chain lower alcohol such as ethanol, butanol, isobutanol, propanol, and isopropanol. In the present invention, the average molecular weight is 1
A water-soluble liquid substance of 000 to 5000 is used. Regarding monoglyceride The monoglyceride used in the present invention is a liquid one, and is a higher saturated fatty acid monoglyceride such as behenic acid, stearic acid, myristic acid, a higher unsaturated fatty acid monoglyceride such as oleic acid, a higher saturated hydroxy acid such as hydroxystearic acid. Fatty acid monoglyceride, higher unsaturated hydroxy fatty acid monoglyceride such as ricinoleic acid, and fat and oil fatty acid monoglyceride such as castor oil and linseed oil are used.

The specific additive used in the present invention is a mixture of the above substances, and is used in an amount of 20 to 40% by weight, preferably 25 to 35% by weight, based on the total amount of the ink. The compounding ratio of each substance of the additive is 10 to 20% of benzoic acid ester of trehalose type disaccharide, and 2% of polyethylene polypropylene glycol alkyl ether.
5-40% and monoglyceride 50-75%.

It is not clear why the additive obtained by mixing the above substances in a predetermined amount imparts light resistance, prevents bleeding and strike-through, absorbs ink promptly, and does not dry the board surface. Is estimated as. (1) When imprinted, the additive forms a thin film on the ink surface and suppresses chemical change of the dye by absorbing or reflecting high-energy light such as ultraviolet rays, and at the same time,
By preventing the dyed part from coming into direct contact with the air, oxidation of the dye is prevented, so the ink does not fade. (2) Since the additive has an appropriate viscosity and an excellent affinity with the solvent, the thin film formed on the ink surface prevents the solvent from diffusing and prevents bleeding or strikethrough. (3) Since the additive does not hinder the volatilization of the solvent and promotes the absorption of the ink on the paper surface, the ink is absorbed and dried on the paper surface in a short time. (4) Usually, since a thin film is formed on the surface of the board, ink volatilization is prevented.

The present invention is intended for absorbent paper, and is not intended for metals, glass, vinyl, and vinyl-coated paper that do not absorb ink. Therefore, no resin is required, but a phenol resin, a ketone resin, or an acrylic resin is used. , Rosin resin,
Appropriate blending of an oil-soluble resin such as a nylon resin or a cellulosic compound does not hinder the effects of the present invention. Further, oleic acid, alkyl ether phosphates, dye dissolution aids such as alkyl phosphates, polyoxypropylene glycol, surfactants such as glycerin polyoxypropylene triol, pH adjusters, antiseptic and fungicide,
A rust preventive agent can be appropriately mixed.

[0011]

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".

(Formulation Example 1 of Additive) Benzoic acid octaester of sucrose 15 parts Polyethylene polypropylene glycol butyl ether 30 parts Castor oil fatty acid monoglyceride 55 parts

(Example 2 of additive formulation) Benzoic acid octaester of sucrose 10 parts Polyethylene polypropylene glycol ethyl ether 35 parts Hydroxystearic acid monoglyceride 55 parts

(Formulation Example 3 of Additive) 10 parts of benzoic acid octaester of trehalose 10 parts of polyethylene polypropylene glycol butyl ether 30 parts of stearic acid monoglyceride

Example 1 Ethylene glycol monobutyl ether 30 parts Diethylene glycol monobutyl ether 30 parts C.I. I. Solvent Blue 2 8 parts Additive of Formulation Example 1 30 parts Polyoxyethylene alkyl ether phosphate ester 2 parts Stir the above components at room temperature to obtain a viscosity of 42 cps (25 ° C).
Of blue ink was obtained.

Example 2 Ethylene glycol monobutyl ether 20 parts Diethylene glycol monobutyl ether 20 parts Benzyl alcohol 10 parts C.I. I. Solvent Blue 2 6 parts C.I. I. Solvent Yellow 34 6 parts Additive of Formulation Example 1 35 parts Oleic acid 3 parts Stir the above components at room temperature to give a viscosity of 53 cps (25 ° C.).
Was obtained.

Example 3 Ethylene glycol monobutyl ether 32 parts Dipropylene glycol monomethyl ether 30 parts C.I. I. Solvent Red 18 5 parts Additive of Formulation Example 2 30 parts Ketone resin 3 parts Stir the above components at room temperature to give a viscosity of 43 cps (25 ° C.).
Of red ink was obtained.

Example 4 Ethylene glycol monobutyl ether 30 parts Dipropylene glycol monomethyl ether 20 parts Benzyl alcohol 12 parts C.I. I. Solvent Violet 8 5 parts Additive of formulation example 3 30 parts Ketone resin 2 parts Oleic acid 1 part Stir the above components at room temperature to obtain a viscosity of 42 cps (25 ° C).
To obtain a purple ink.

(Comparative Example 1) An additive (Comparative Compounding Example 1-) prepared to have substantially the same viscosity as that of Compounding Example 1 except that benzoic acid octaester of sucrose was removed from Compounding Example 1 was used.
In place of the above, 30 parts were added to Example 1 to obtain a blue ink.

(Comparative Example 1) Except for polyethylene polypropylene glycol butyl ether from Formulation Example 1, an additive (Comparative Formulation Example 1-) prepared to have substantially the same viscosity as that of Formulation Example 1 was used instead of Formulation Example 1. 30 parts by weight were blended with 1 to obtain a blue ink.

(Comparative Example 1) An additive (Comparative Compounding Example 1-) prepared by removing castor oil fatty acid monoglyceride from Compounding Example 1 and having a viscosity substantially the same as that of Compounding Example 1 was used in place of Compounding Example 1. To 30 parts to give a blue ink.

Comparative Example 2-35 parts of Comparative Blend Example 1 was blended with Example 2 instead of Blend Example 1 to obtain a green ink.

(Comparative Example 2-) 35 parts of Comparative Blend Example 1 was blended with Example 2 instead of Blend Example 1 to obtain a green ink.

Comparative Example 2-35 parts of Comparative Blend Example 1 was blended with Example 2 instead of Blend Example 1 to obtain a green ink.

Comparative Example 3 An additive (Comparative Formulation Example 2-) prepared to have substantially the same viscosity as that of Formulation Example 2 except that benzoic acid octaester of sucrose was excluded from Formulation Example 2 was used.
In place of the above, 30 parts were added to Example 3 to obtain a red ink.

(Comparative Example 3) An additive (Comparative Compounding Example 2-) prepared in substantially the same viscosity as that of Compounding Example 2 except that polyethylene polypropylene glycol ethyl ether was removed from Compounding Example 2 was used instead of Compounding Example 2. 30 parts were mixed with Example 3 to obtain a red ink.

(Comparative Example 3) An additive (Comparative Compounding Example 2-) prepared by removing hydroxystearic acid monoglyceride from Compounding Example 2 and having a viscosity substantially the same as that of Compounding Example 2 was used in place of Compounding Example 2. 30 parts were mixed with 3 to obtain a red ink.

(Comparative Example 4-) Except for the benzoic acid octaester of trehalose from Formulation Example 3, an additive (Comparative Formulation Example 3-) prepared to have substantially the same viscosity as Formulation Example 3 was used instead of Formulation Example 3. 30 parts were mixed with Example 4 to obtain a purple ink.

(Comparative Example 4) Except for polyethylene polypropylene glycol butyl ether from Compounding Example 3, an additive (Comparative Compounding Example 3-) prepared to have substantially the same viscosity as that of Compounding Example 3 was used in place of Compounding Example 3. 4 was mixed with 30 parts to obtain a purple ink.

(Comparative Example 4-) The additive (Comparative Compounding Example 3-) prepared by removing stearic acid monoglyceride from Compounding Example 3 and having substantially the same viscosity as that of Compounding Example 3 was used instead of Compounding Example 3. To 30 parts to give a purple ink.

The ink of each Example and each Comparative Example was impregnated into a stamp base, and a commercially available rubber stamp was applied to each of coated paper, art paper, and fine paper. Next, the state of these imprints and the state after irradiation with a fade meter for 10 hours were observed. Also, with the lid of the stamp stand left open, the time until the stamping of the board surface was impossible was measured. The results are shown below.

[0032]

[Table 1]

[0033]

[Table 2]

(Test Method and Evaluation Criteria) Object to be Imprinted ... Coated Paper, Art Paper, Fine Paper Nijimi Test ... Imprint was visually observed. ∘: Almost none △: Slightly present ×: Fairly present Strike-through test: Imprints were visually observed. ◎… Almost none △… Somewhat ×… Excessively set time… After imprinting, stacking high-quality paper 1kg / cm2
Was applied to measure the time until transfer was stopped. Light resistance test ... fade. After irradiating with a meter for 10 hours, it was observed using a gray scale for color change and fading (JIS L 0804). Comparison was made between No. 5 (small discoloration and fading) to No. 1 (large discoloration and fading). Drying time of board surface: With the lid of the stamp stand left open, the time until the board surface became imprintable was measured.

From the results of (Table 1 and Table 2), the ink of the present invention showed high light resistance even after irradiation with a fade meter. In addition, the imprint after imprinting and strike through, and the set time, the present invention does not have a blur and strike through, a stable value was obtained for the set time, but the comparative example causes blur and strike through, The set time was slow. Further, the ink of the present invention showed excellent characteristics in the time until the imprinting of the board surface with the lid of the stamping table left open was impossible, but the comparative example is usually inconvenient for consumer use. It has dried in the time it has occurred. Now, instead of the additive of the present invention, when an ink in which a large amount of only one of the substances is added is produced, one of the effects of the present invention may be satisfied. , It seems that other effects may not be satisfied.
For example, an ink with a large amount of monoglyceride added,
Although the surface of the board is not dried, the ink setting time is significantly delayed and the light resistance is significantly poor. Therefore, in order to satisfy all the objects of the present invention at the same time, it is essential to use a specific additive compounded with the above-mentioned substances.

[0036]

[Effect] As described above, according to the present invention, by adding a specific additive, a dye can be freely selected without worrying about light resistance.
Moreover, it is used for dye-based stamp bases such as coated paper, art paper, and high-quality paper that are quickly absorbed without bleeding or strike-through, and the surface does not dry even if the stamp base lid is left open. Oily ink can be obtained

Claims (1)

[Claims] 1. An oil-based ink for a stamp stand, which comprises an alcohol solvent, a solvent comprising a glycol solvent alone or a mixture thereof, and a dye, wherein a trehalose-type disaccharide benzoate ester and polyethylene polypropylene glycol alkyl ether, Also, an oil-based ink for a stamp stand, which is prepared by mixing an additive composed of monoglyceride.