JP2000086962A - Manufacture of ink for painting tools and manufacture of painting tools - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for painting ink having sufficient depressor effect on generation and growth of foams and free from change in composition by degassing the raw material ink containing an additive solvent having lower boiling point than the main solvent. SOLUTION: This ink is obtained by preparing the raw material ink comprising (A) pigments and/or (B) dyes and (C) main solvent and (D) 0.2 to 10 wt.%, based on the total weight, of the additive solvent having boiling point lower than the main solvent or a high vapor pressure and degassing the raw material ink after preparation. The solvent having boiling point <=80 deg.C or vapor pressure >=30 mmHg at 20 deg.C is preferred as the component (D), and methanol, acetone or the like are concretely cited as the preferable examples. The whole of the component (C) is preferably vaporized in the degassing process. The degassing process is carried out for example, placing the raw material ink in an atmosphere of reduced pressure. In the case, the process is carried out by watching the pressure change under the atmosphere of the reduced pressure, and the degassing process is preferably stopped when the pressure changed rapidly or when the pressure change per hour become insignificance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an ink for an applicator. The ink produced by the present invention is suitable for use in an applicator having a structure in which the ink in the ink tank flows out without being replaced with air. The present invention also relates to a method for manufacturing an applicator such as a felt-tip pen, a fountain pen, a ball-point pen, a line marker, etc., which has a structure in which ink having fluidity is contained.

[0002]

2. Description of the Related Art An ink using water or alcohol as a solvent is often used for an applicator such as a line marker.
These inks for applicators are obtained by dissolving a dye as a colorant in a solvent or dispersing a pigment as a colorant in a solvent. Examples of the dye used in the ink for the applicator include water-soluble dyes such as acid dyes, basic dyes, and direct dyes, spirit dyes, alcohol-soluble dyes, oil-soluble dyes, and the like. ) Dispersed pigments, styrene acrylic resin dispersed pigments, styrene maleic resin dispersed pigments, and the like are used. In addition, a resin is added to the ink for the applicator to develop handwriting properties such as adhesiveness and water resistance, or to improve the solubility of the dye or the dispersibility of the pigment to improve the stability of the ink. Sometimes. Emulsions such as vinyl acetate resin, ethylene acetate resin and acrylic resin, PVP (polyvinylpyrrolidone),
Water-soluble or water-dispersible resins such as HPC (hydroxypropylcellulose), styrene-maleic acid half-ester resin, styrene-acrylic acid resin, PVB (polyvinyl butyral), carbonate resin, ketone resin, xylene resin,
Rosin resin, petroleum resin, terpene resin and the like are used. Furthermore, various auxiliaries are added to the ink for coating tools for the purpose of preventing drying, improving solubility / dispersibility, preserving, rustproofing, imparting releasability, improving cap-off properties, and the like.

[0003] As one of applicators such as line markers, there has been known a configuration called a free ink type in which ink is directly incorporated in a fluid state. The free ink type applicator is roughly classified into a type in which consumed ink is replaced with air, and a type in which the volume itself of the ink storage unit is reduced with consumption of ink. The latter type of applicator, in which the volume of the ink storage unit itself is reduced, is superior to the former in that ink dripping is small and the number of parts is small. Typical examples of the type of applicator that reduces the volume of the ink storage section itself include applicators with slide stoppers, high-viscosity fluids, gelled fluids that do not mix with ink, or combinations of fluids and floats. (Japanese Patent Application Laid-Open (JP-A) No. 64-5897, JP-B-7-131010).
No. 1 etc.).

FIG. 1 is a sectional view of a typical applicator with a slide stopper. Applicator with slide stopper 1 shown in FIG.
Is composed of a main body 2, a tail plug 3, a tip plug 5, a bellows-type valve 6, and a slide plug 7. To explain sequentially, the main body 2 functions as an ink tank in this example, and is a cylindrical body made of a transparent or translucent material so that the remaining amount of ink can be visually checked. A tip plug 5 is attached to the tip of the main body 2. A tip tip 8 made of felt or resin is attached to the tip plug 5.

The inside of the main body 2 is a hollow having a substantially uniform circular cross section, but a constricted portion 10 is provided near a portion near the front end, that is, near a portion where the rear end of the tip plug 5 is located.
The bellows type valve 6 is arranged in the constricted portion 10. Further, a slide stopper 7 is arranged inside the main body 2.
The slide stopper 7 is a stopper made of rubber, resin, or the like, which is in liquid-tight contact with the inside of the main body 2 and is movable in the axial direction in the main body 2 while maintaining the liquid tightness. It is.
In the applicator 1 with a slide stopper, the space surrounded by the slide stopper 7 and the bellows-type valve 6 in the main body (ink cylinder) 2 functions as an ink tank 11. The ink tank 11 is filled with the ink 12 in a state of having fluidity and not containing a gas.

In the applicator 1, when the pen tip 8 is pressed against paper or the like, the bellows type valve 6 is deformed and the ink tank 1 is deformed.
1, the ink 12 is caused to flow out of the ink tank 11 and the ink 12 is applied from the pen tip 8 to the paper surface. Therefore, in this type of applicator 1, the ink tank 1
It is important that the inside 1 is always filled only with the ink 12, and it is necessary to strictly prevent gas from entering the ink tank 11. That is, if gas is mixed into the ink tank 11, pressurization of the ink tank 11 is hindered by the compressibility of the gas, and the ink 12 does not flow out.

For this reason, the coating tool 1 is devised in terms of structure so that gas does not enter the ink tank 1. In addition, the ink to be filled is strictly defoamed, and the gas dissolved in the ink or mixed as fine bubbles is removed in advance. That is, if a gas such as air is dissolved or mixed in the ink, bubbles are generated in the ink tank 12 with time, and a phenomenon that the bubbles grow is recognized. Done. For the defoaming treatment, a method of vaporizing dissolved gas by placing the ink in a reduced-pressure atmosphere or heating the ink is widely adopted.

[0008] The defoaming treatment of the ink is often performed immediately before filling the ink into the applicator. However, after the ink is filled into the applicator, the defoaming may be performed by placing the ink tank together with the ink tank in a reduced-pressure atmosphere. is there.

In addition, as a measure for removing gas mixed in the ink and preventing generation of bubbles, it is known to add a compound such as L-ascorbic acid to the ink (Japanese Patent Publication No. Hei 7-113101). No.). The reason why the generation of bubbles is suppressed by adding L-ascorbic acid is not necessarily clear, but it is considered that oxygen in the air is consumed by the reducing action of ascorbic acid.

[0010]

Among the above-mentioned measures for removing the gas mixed in the ink and preventing the generation of bubbles,
In the latter method of adding L-ascorbic acid or the like, there is a possibility that side effects may be caused on other compounds in the ink, and there is a limit to the amount that can be added. Further, L-ascorbic acid does not react with nitrogen in the air but does not react with nitrogen, so that its bubble suppressing effect is insufficient.

On the other hand, the former defoaming treatment is a practical method, but has a problem that the solvent evaporates during the treatment and the ink composition changes. That is, it is difficult to measure whether or not the defoaming treatment is sufficient during or immediately after the treatment. The ink subjected to the defoaming treatment is stored for several weeks, and the amount of bubbles generated during the storage is measured. The fact is that it is possible to determine for the first time whether or not the defoaming treatment has been sufficient.
As described above, it is not directly known whether or not the defoaming treatment is sufficient. Therefore, in order to suppress the generation of bubbles, the defoaming treatment time needs to be extended with a margin. Here, the defoaming treatment is roughly divided into defoaming defoaming in which the ink is placed in a depressurized atmosphere and heating defoaming in which the temperature of the ink is raised. In any case, the temperature and pressure conditions are such that the solvent boils. Otherwise, the defoaming process often does not proceed sufficiently. Therefore, if the defoaming treatment time is too long, the composition of the ink changes due to evaporation of the solvent, the viscosity of the ink increases, and writing becomes difficult, and the composition tends to precipitate. Therefore,
The processing time for defoaming cannot be lengthened unnecessarily.

As described above, the requirement to completely remove the gas in the ink and the requirement to keep the ink composition constant are conflicting requirements. For this reason, the merits of defoaming and the demerit of changing the composition are weighed, and the optimal conditions such as defoaming time, maximum temperature, minimum pressure, heating rate, and maximum pressure drop rate for depressurization are determined empirically. And that decision was difficult.

[0013] Even if the standard optimum conditions are determined, in the actual defoaming processing, the optimum processing time differs in each case due to deviations from the actual set values of temperature and pressure. However, since it is difficult to measure the defoaming effect and ink composition during or immediately after the process, there is no way to perform the process uniformly under predetermined standard defoaming conditions. To control the defoaming time.

The present invention has been made in view of the above-mentioned problems of the prior art,
An object of the present invention is to provide a method for producing an ink for an applicator, which has a sufficient effect on suppressing the generation and growth of bubbles in the ink, and which does not have the drawback of causing a change in the ink composition. In addition, an object of the present invention is to provide a method for producing an ink for an applicator, in which the optimum time of the defoaming treatment is easily determined. Another object of the present invention is to develop a method of manufacturing an applicator that can generate stable air for a long period with less generation of air bubbles.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a pigment and / or a dye, a main solvent, and an additive solvent having a lower boiling point or a higher vapor pressure than the main solvent. A method for producing an ink for an applicator, comprising preparing a raw material ink containing 0.2% or more and 10% or less, and subjecting the raw material ink to a defoaming treatment.

As the defoaming treatment, any of vacuum defoaming, in which the raw material ink is placed in a reduced-pressure atmosphere, and heat defoaming, which raises the temperature of the raw material ink, can be employed.

The above-mentioned main solvent refers to the largest amount of the solvents to be mixed in the ink. The solvent having a boiling point lower than that of the main solvent refers to a solvent whose boiling point under atmospheric pressure is lower than that of the main solvent. The solvent having a higher vapor pressure than the main solvent refers to a solvent having a higher saturated vapor pressure at room temperature than the main solvent, and is a solvent that boils before the main solvent during the decompression treatment. However, except in special cases, both are synonymous, and there is little need to distinguish them.

When the ink containing the additive solvent having a higher vapor pressure than the main solvent is confined in a closed space and the pressure in the closed space is gradually reduced, the high vapor pressure solvent is used when the system pressure decreases to a certain value. Begins to boil. The boiling gas bubbles of the high vapor pressure solvent expel gas mixed in the ink together from the liquid, so that the gas mixed in the ink rapidly decreases. In addition, at this time, what is reduced by evaporation is almost the added high vapor pressure solvent, and the reduction of the main solvent can be suppressed to a small extent. When the additive solvent having a higher vapor pressure than the main solvent evaporates, the pressure drop curve of the system becomes gentle.

The same applies when the ink is heated.
When the temperature rises to a certain value, boiling of the low-boiling solvent begins, where the temperature rise is slow. Since the gas bubbles mixed in the ink expel the gas mixed in the ink from the liquid, the gas mixed in the ink rapidly decreases. In addition, at this time, what is reduced by evaporation is almost the low-boiling solvent added, and the reduction of the main solvent can be suppressed to a small extent.

It is desirable that substantially all of the additive solvent be vaporized by a defoaming treatment.

That is, the amount of the additive solvent having a low boiling point (high vapor pressure) is reduced, substantially the entire amount is vaporized, the boiling is completed, and the main solvent starts to evaporate. Occurs. Therefore, the pressure change of the decompressed atmosphere during the defoaming process and the temperature change of the raw material ink are monitored, and the time when the pressure or temperature changes rapidly, or the time when the pressure change or temperature change per hour becomes small, is a guideline. After finishing the defoaming treatment, the defoaming treatment can be performed without substantially changing the original composition of the ink. In the conventional defoaming treatment, it was difficult to determine and manage the defoaming conditions. However, according to the present invention, the solvent having a low boiling point (high vapor pressure) is used for the original composition of the ink,
It will serve as an indicator for maintaining function.

A raw material ink having a pigment and / or a dye, a main solvent, and containing an additive solvent having a lower boiling point or a higher vapor pressure than the main solvent in an amount of 0.2% to 10% based on the total weight. By preparing and applying a defoaming treatment to the raw material ink, and then filling the coating material with the coating material, it is possible to produce a coating material capable of suppressing the generation of bubbles and performing coating over a long period of time.

Prior to filling the applicator, it is desirable to vaporize substantially all of the additive solvent.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The method for producing an ink for an applicator of the present invention comprises a step of preparing a raw material ink and a step of performing a defoaming treatment on the raw material ink. The raw material ink prepared prior to defoaming contains at least one of a pigment and a dye, a resin, a main solvent, and an additive solvent.
In addition, known auxiliaries for preventing drying, improving solubility, preserving, rust preventing, imparting releasability, improving cap-off properties, and the like are added according to the purpose.

The dyes used for preparing the raw material inks include water-soluble dyes such as acid dyes, basic dyes and direct dyes;
Spirit dyes, alcohol-soluble dyes, oil-soluble dyes and the like are used. Pigments used for preparing the raw material ink include PVB-dispersed pigments, styrene-acrylic acid resin-dispersed pigments, and styrene-maleic acid resin-dispersed pigments.

As the resin to be mixed in the raw material ink,
Water-soluble or water-dispersible resins such as emulsion, PVP (polyvinylpyrrolidone), HPC (hydroxypropylcellulose), styrene-maleic acid half-ester resin, styrene acrylate resin, etc.
B (polyvinyl butyral), carbonate resin, ketone resin, xylene resin, rosin resin, petroleum resin, terpene resin, and the like can be used.

As the main solvent, a liquid that dissolves dyes and resins, decomposes pigments, and gives fluidity as ink is used. Specifically, water, ethanol, methanol, isopropyl alcohol, n-propyl alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, ethylene glycol monomethyl ether Isopropyl ether, ethylcyclohexane, methylcyclohexane, dimethylcyclohexane, xylene, toluene, MIBK (methyl isobutyl ketone) and the like can be employed.

The additive solvent may be one having a lower boiling point or a higher vapor pressure than the main solvent, and even the substances mentioned as the above main solvent can be used as the additive solvent. For example, when ethylcyclohexane (boiling point 132 ° C.) or propylene glycol monomethyl ether (boiling point 119 ° C.) is used as the main solvent, n-propyl alcohol (boiling point 9
7.2 ° C.) and ethanol (boiling point 78.2 ° C.) can be used as entrainers.

The substance which can be used as an additive solvent as described above is relatively determined depending on the relationship with the main solvent. As a rough guide, the boiling point is 80 ° C. or less, or 20 ° C.
A solvent having a vapor pressure at 30 ° C. of 30 mmHg or more is suitable as the additive solvent. Specifically, methanol, ethanol, isopropyl alcohol, acetone, methyl ethyl ketone, ethyl ether, isopropyl ether,
Methyl formate, ethyl formate, methyl acetate, ethyl acetate, n
-Pentane, isopentane, n-hexane, isohexane, n-heptane, carbon tetrachloride, ethylidene dichloride, dioxolane and the like are suitable as the additive solvent.

The difference in boiling point between the main solvent and the additive solvent is 4%.
Desirably, the temperature is 0 ° C. or more, and the more desirable difference is 60 ° C. or more. Similarly, the difference in vapor pressure between the main solvent and the additive solvent is desirably 20 ° mmHg or more, and more desirably, the difference between the two is 60 ° mmHg or more.

The raw material ink may optionally contain an auxiliary solvent in addition to the main solvent and the additive solvent for improving the storage stability of the ink. In this case, the auxiliary solvent can be used at a lower boiling point (higher vapor pressure) or a higher boiling point (lower vapor pressure) than the main solvent, but the additive solvent needs to have a lower boiling point (higher vapor pressure) than the auxiliary solvent. . In other words, among the solvents contained in the raw material ink, the one having the lowest boiling point or the highest vapor pressure functions as an additive solvent.

As described above, a substance which can be a main solvent,
Substances that can be additive solvents are relative, but generally, substances that should be the main solvent, substances that should be the additive solvent, and substances that are suitable for both the main solvent and the additive solvent. Therefore, these are listed in the table below, and the boiling point and the vapor pressure at 20 ° C. are added.

[0033]

[Table 1]

[0034]

[Table 2]

[0035]

[Table 3]

It is essential that the compounding amount of the additive solvent in the raw material ink is 0.2% or more and 10% or less of the total weight of the raw material ink. Also, the amount of the coloring agent should be 1% or more,
5% or less is a practicable range. The amount of the resin is desirably less than 20% of the total weight of the raw material ink.

That is, when the amount of the additive solvent is less than 0.2% of the weight of the raw material ink, degassing cannot be said to be sufficient even if the entire amount of the additive solvent is vaporized, and gas remains in the ink. In other words, when the additive solvent is less than 0.2% of the weight of the raw material ink, in order to completely remove the gas in the ink, it is necessary to perform defoaming treatment until the main solvent evaporates. The composition of the ink after foaming may deviate from the desired composition.

Conversely, the additive solvent is 10% of the weight of the raw material ink.
%, The ink may deteriorate due to precipitation of the ink composition.

If the amount of the coloring agent is less than 1%, the color is poor. Conversely, when the colorant exceeds 15% of the weight of the raw material ink, after the defoaming treatment is performed, the ratio of the colorant further increases due to the vaporization of the additive solvent, the viscosity of the ink increases, and the storage of the applicator is performed. There is a problem that the ink composition precipitates in the ink and the ink composition is fuzzy during coating.

If the amount of the resin added is too small, poor adhesion on the non-absorbing surface, poor water resistance, etc. may occur. However, a marker dedicated to paper may be practical without adding the resin to the ink. However, resin is not an essential component. However, if the added amount of the resin exceeds 20% of the raw material ink, as in the case where the colorant is too large, after the defoaming treatment is performed, the ratio of the resin further increases due to the vaporization of the added solvent, and the viscosity of the ink is reduced. The ink composition will increase during storage of the applicator, and will cause blemishes during application.

In practice, it is particularly preferable that the amount of the additive solvent be 1% or more and 5% or less of the weight of the raw material ink, and the amount of the colorant is also 3% or more and 12% or less. A preferred range for the amount of resin is also 15% or less.

The amount of the main solvent depends on the amount of the additive solvent, the colorant, the resin,
And the sum of the amounts of other auxiliary agents and the like is defined as a value obtained by subtracting 100% from the total amount, which is approximately 40 to 85%. A preferred range for the amount of main solvent is 45-70%.

Further, conventionally known drying prevention, improvement of solubility,
Auxiliaries for preservation, rust prevention, imparting releasability, improving cap-off properties, etc. may be added according to the purpose. That is, since the additive solvent is hardly contained in the final product ink, the components other than the additive solvent in the raw material ink, that is, the ratio of the main solvent, the auxiliary solvent, the coloring agent, the resin, and the other auxiliary agents are It is prepared almost equal to the ratio of the components of the ink as the final product. In other words, the ratio of each component of the raw material ink other than the additive solvent is almost the same as the conventional one, and the additive solvent may be contained in the raw material ink. In addition, as a method of incorporating the additive solvent into the raw material ink, a main solvent, an auxiliary solvent, a coloring agent, a resin, and other auxiliaries are first mixed to produce a raw material ink containing no additive solvent, and then the additive solvent is added. Can be used, and a method of producing a raw material ink by blending an additive solvent from the beginning can be used. Generally, the latter method is advantageous because the production process can be simplified. In addition,
The total amount of the additive solvent may be blended before the start of the defoaming treatment, or a part thereof may be blended before the start of the defoaming treatment, and the remaining amount may be blended during the defoaming treatment.

In the method for producing an ink for an applicator of the present invention,
A defoaming treatment is applied to the raw material ink having the above-mentioned composition. As the means for the defoaming treatment, any of vacuum defoaming in which the ink is placed in a reduced pressure atmosphere and heat defoaming in which the temperature of the ink is raised can be adopted. The defoaming treatment of the raw material ink may be performed, for example, by leaving the ink under a pressure of 30 mmHg for 20 minutes, but it is more preferable to perform the defoaming treatment until substantially all of the additive solvent is vaporized. Whether or not substantially all of the additive solvent has been vaporized can be known by monitoring the vacuum pressure during the defoaming treatment and the temperature rise curve of the ink.

For example, when defoaming is performed by vacuum defoaming, and defoaming is performed while depressurizing a predetermined vacuum vessel with a vacuum pump, that is, placing the raw material ink in an atmosphere in which the pressure gradually decreases. In the case of performing defoaming, the pressure gradually decreases during the evaporation of the additive solvent, and the pressure rapidly decreases when all the additive solvent evaporates. Therefore, the pressure in the vacuum vessel during the defoaming process is monitored, and if the defoaming process is stopped when the pressure drops sharply, the defoaming process can be stopped when substantially all of the additive solvent has been vaporized. .

If a method is adopted in which the vacuum vessel is shut off at the time when the vacuum pressure is set to a certain level and the vacuum vessel is left as it is, the pressure in the vacuum vessel rises with the passage of time, and all the added solvent evaporates. At this point, the pressure rise curve becomes gentle. Therefore, the pressure in the vacuum vessel during the defoaming process is monitored, and the defoaming process is stopped when the pressure gradually rises.

On the other hand, when the defoaming treatment is performed while heating the raw material ink, the temperature rise of the raw material ink is gradual while the additive solvent is evaporating because the additive solvent removes heat of vaporization. Yes, the temperature rises abruptly when all the solvent has evaporated. Therefore, if the temperature of the raw material ink during the defoaming process is monitored and the defoaming process is stopped when the temperature rises sharply, the defoaming process can be stopped when substantially all of the additive solvent has vaporized.

The ink thus defoamed does not contain gas inside, and the compounding ratio of each compound is stable. The ink is filled in an ink tank 11 of the applicator 1 as shown in FIG.

[0049]

Next, examples of the present invention and comparative examples will be described. In order to confirm the effects of the present invention, raw material inks having the formulations of the following examples were prepared. The manufacturers and components of the dyes and pigments used in Examples and Comparative Examples are shown in Table 4 below.
5

[0050]

[Table 4]

[0051]

[Table 5]

The compositions of the raw material inks used in Examples 1 to 6 are shown in Tables 6 to 11 below. The compositions listed in the tables are by weight. For the raw material inks used in Examples 1 to 5, inks containing no additive solvent were prepared, and then the additive solvent was added. In the raw material inks used in Examples 1 to 5, the total amount of components other than the additive solvent is 100 parts by weight. On the other hand, the raw material ink used in Example 6 was prepared by blending an additive solvent from the beginning, and the total amount of components including the additive solvent was 100 parts by weight.

[0053]

[Table 6]

[0054]

[Table 7]

[0055]

[Table 8]

[0056]

[Table 9]

[0057]

[Table 10]

[0058]

[Table 11]

In addition, corresponding to the raw material inks of Examples 1 to 5, the raw material inks of Comparative Examples 1 to 5 were prepared from the raw material inks except that only the additive solvent was removed. Then, the raw material inks of Examples 1 to 6 and Comparative Examples 1 to 5 were subjected to defoaming treatment under the same conditions, and after storing for a certain period of time, the dissolved oxygen concentration and viscosity of the ink were measured. Specifically, the sample 30
0 g was placed in a 3 liter glass bell and a vacuum pump (MINI-VAC MODERU- manufactured by Yamato Scientific Co., Ltd.) was used.
PS-20) for 20 minutes under reduced pressure.
After storage at 0 ° C. for one month, the dissolved oxygen concentration and viscosity of the ink were measured. For the measurement of the dissolved oxygen concentration, a dissolved oxygen concentration meter MO128 manufactured by Metra Toledo Co., Ltd. was used. Visconic EL manufactured by Toki Sangyo Co., Ltd.
Type D was used. Further, the inks having the same composition as the raw material inks used in Comparative Examples 1 to 5 and Example 6 were similarly stored at 50 ° C. for one month without performing any defoaming treatment, and then dissolved by the same measuring method. The oxygen concentration and viscosity were measured. These are referred to as Comparative Examples 1 ′ to 5 ′ and Comparative Example 6, respectively. Tables 12 and 13 show the measured values of the dissolved oxygen concentration and the viscosity of the ink in each of Examples and Comparative Examples.

[0060]

[Table 12]

[0061]

[Table 13]

As shown in Table 12 above, Examples 1 to
The dissolved oxygen concentration after storage of the ink of No. 6 is much smaller than the numerical values of the inks of Examples 1 to 5 as well as the numerical values of the inks of Comparative Examples 1 ′ to 5 ′ and Comparative Example 6 without performing the defoaming treatment. Even when the values of the inks of Comparative Examples 1 to 5 subjected to the defoaming treatment were compared with each other, the former was 1 / l of the latter.
It is reduced to about 2 and the defoaming effect in the example is large. On the other hand, as shown in the column of ink viscosity in Table 12, conventional inks subjected to defoaming treatment (Comparative Examples 1 to 5)
5) is a conventional ink without defoaming treatment (Comparative Example 1 ')
~ 5 '), the ink viscosity is increased (2% to 8% increase),
This is one of the problems of the prior art as described above. In contrast, the viscosities of the inks of Examples 1 to 5 were
5 is lower than the viscosity of the conventional ink (Comparative Examples 1 'to 5') (2% decrease to 3% increase). ). Also, the viscosity of the ink of Example 6 was about the same as the viscosity of the ink of Comparative Example 16 (3% increase) in which the defoaming treatment was not performed on the raw material ink of the same component. Does not cause the problem of viscosity increase as in the case of the above ink. By filling the applicator with the applicator ink of the present invention, bubbles are generated.
It is easily guessed from the above examples that the adverse effects due to growth are smaller than those of the conventional applicator, and that it is difficult for writing or the like to be difficult due to a change in ink composition (increase in viscosity).

[0063]

According to the method for producing an ink for an applicator of the present invention, an ink for an applicator in which generation and growth of bubbles are sufficiently suppressed by the defoaming treatment is produced, and the ink during the defoaming treatment is produced. The change in the composition does not matter, and the determination of the defoaming time is facilitated.

Further, according to the method for manufacturing an applicator of the present invention, an applicator filled with the ink for an applicator in which generation and growth of bubbles are sufficiently suppressed by the defoaming process is manufactured, and the defoaming process is performed. A rise in the viscosity of the ink due to a change in the ink composition during the printing is not a problem, and the defoaming time can be easily determined. In this applicator, the ink becomes faint and becomes difficult to apply, or the gas expands due to an increase in outside temperature,
Since the ink is extruded from the ink storage unit, the problem of the ink dropping hardly occurs, and the ink can be used up to the end with good writing taste.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a typical free ink type applicator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Applicator 2 Main body 5 Tip stopper 6 Bellows-type valve 8 Pen tip 11 Ink tank 12 Ink

Continued on front page F-term (reference) 4J039 AB02 AB08 AD03 AD07 AD18 AD23 AE01 AE02 BC01 BC02 BC03 BC05 BC07 BC08 BC12 BC13 BC16 BC18 BC20 BC31 BE01 BE02 BE12 CA02 DA07 EA44 GA26 GA27 GA28

Claims (6)

[Claims] 1. A raw material ink comprising a pigment and / or a dye, a main solvent, and an additive solvent having a lower boiling point or a higher vapor pressure than the main solvent in an amount of 0.2% to 10% based on the total weight. And subjecting the raw material ink to a defoaming treatment. 2. The method for producing an ink for an applicator according to claim 1, wherein substantially all of the additive solvent is vaporized by a defoaming treatment. 3. The defoaming treatment of the raw material ink is performed by placing the raw material ink in a reduced pressure atmosphere, and the pressure change of the reduced pressure atmosphere during the defoaming process is monitored. The method for producing an ink for an applicator according to claim 1 or 2, wherein the de-treating process is finished at a time when the pressure change in the pressure is small. 4. The defoaming treatment of the raw material ink is performed by heating the raw material ink, and the temperature change of the raw material ink during the defoaming process is monitored. 2. The method according to claim 1, wherein the debinding process is completed when the temperature change per hit is small.
Or the manufacturing method of the ink for applicators of Claim 2. 5. A raw material ink comprising a pigment and / or a dye, a main solvent, and an additive solvent having a lower boiling point or a higher vapor pressure than the main solvent in an amount of 0.2% to 10% based on the total weight. A method for producing an applicator, comprising: preparing a raw material ink, performing a defoaming treatment on the raw material ink, and then filling the applicator. 6. The method for manufacturing an applicator according to claim 5, wherein substantially all of the additive solvent is vaporized by a defoaming treatment.