JPH071885A - Decoloring ink stabilizing occulusion body and decoloring ink marking pen with built-in occulusion body - Google Patents

Abstract

PURPOSE:To provide a decoloring ink stabilizing occlusion body which can keep the hand-writing in the practical density for a given time in the case of wiring on a sheet such as a map and a decoloring ink marking pen with built-in occlusion body. CONSTITUTION:A decoloring ink stabilizing occlusion body 5 is built in a decoloring ink marking pen 1 and absorbs acidic gas generated from another decoloring ink occlusion body 4 built in the pen separately to prevent the oxidization of atmosphere in the marking pen. Mixed liquid of second or third gade lower alkanolamine or water solution containing the said alkanolamine of 5% or more or water solution of low alkanolamine and amine of 5%, to each of which ammonia water of 5% or less is added, is immersed in the occlusion body 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a practical density for a certain period of time even when an erasable ink that develops color in an alkaline state and disappears as the pH decreases is written on paper or cloth. The present invention relates to an erasable ink stabilizing occluding body capable of leaving the handwriting and a marking pen for the erasable ink incorporating the occluding body.

[0002]

2. Description of the Related Art An ink for marking is prepared by coloring a certain dye or indicator with an aqueous alkali solution such as sodium carbonate and adding an organic amine such as triethanolamine and a humectant such as glycols. It has been used as a decolorizable ink because the basic volatile component is volatilized and lost over time, or the degree of alkalinity is reduced to change the chemical structure of the dye and eventually decolorize.

In this case, triethanolamine (hereinafter abbreviated as TEA) is used as the organic amine, but not only TEA but also lower alkanolamines such as dipropanolamine or tripropanolamine are acidic gases. It has absorption ability and has been widely used as an acidic gas absorbent since ancient times. In the case of alkaline coloring type ink, the pen is kept airtight by closing the cap to prevent loss of color due to acidification due to the effect of acid gas such as carbon dioxide gas contained in the air inside the pen body. In a place where there is only a limited amount of air, such as the inside of the body, the amount of carbon dioxide gas (acidic gas) in it is naturally limited, so if this is absorbed by the alkanolamines. Further acidification does not proceed, and the ink pH
Since it is stably maintained, it is possible to maintain the colored state for a long time.

However, when the ink is written on paper, cloth, etc., unlike the limited space inside the pen body, the ink is exposed to a large amount of air and comes into contact with it, so that the pH decreases with time, The colored state can no longer be maintained and the colors are lost. In this case, the presence of alkanolamines having a property of absorbing acidic gas in the ink accelerates the acidification further, and TEA or the like is not added under the condition that the content of the alkali salt in the ink is constant. The phenomenon that the coloring time becomes shorter than the case occurs. That is, although the addition of alkanolamines is extremely effective in maintaining the stability of the ink in the pen body, those written once with this ink and exposed to the outside air do not have the amines added. The inventor discovered through experimentation that the color disappears faster than the color.

In other words, in this case, the alkanolamines act symmetrically in the ink, and act as a pen for stabilization, but in the state of handwriting after writing, the acid gas is attracted and the decoloring is rather accelerated. It was found to work in the direction of promoting the change of ink. Moreover, this phenomenon is more prominent when writing on a paper such as a map book than when using cloth. This is because in the case of cloth, the ink penetrates deeply into the micelle gaps of the fibers and it becomes difficult to touch the outside air, so the erasing progresses relatively slowly and the holding property is maintained for a long time, but in the case of paper It is thought that the reason is that since the surface of the ink is simpler and smoother than the cloth, the ink does not easily pass through it and is easily exposed to the outside air, and the components are easily volatilized.

As described above, even with inks having the same composition, the behavior is different between the case of cloth and the case of paper in terms of the erasing time,
There is a problem that the practical retention of ink concentration is too short to use for paper, and there is a problem that it is too short.If you increase the amount of indicator or alkali to extend this, the ink will not disappear and the handwriting will remain. There was a problem that it was difficult to control such that it ended up.

[0007]

Therefore, the present invention solves the above-mentioned conventional problems, and even when writing on a paper such as a map book, the handwriting can be left at a practical density for a certain period of time. It is an object of the present invention to provide an occlusive body for stabilizing color ink and a marking pen for decolorable ink having the occluder therein.

[0008]

In order to achieve the above-mentioned object, the invention according to claim 1 is an acid generated from a decolorable ink occlusion body built in a marking pen for decolorable ink and separately built in the pen. It absorbs gas to prevent acidification of the atmosphere in the marking pen, and is a secondary or tertiary lower alkanolamine or an aqueous solution containing 5% or more thereof, or the lower alkanolamine and the amine 5%. Each of the above aqueous solutions is impregnated with a mixed solution containing 5% or less of ammonia water. According to a second aspect of the present invention, in the first aspect, the secondary or tertiary lower alkanolamine is an alkanol group having 2 to 4 carbon atoms.

According to a third aspect of the present invention, the erasable ink stabilizing storage material according to the first or second aspect is built in the pen body or the cap.

[0010]

As described above, alkanolamines such as TEA are not added to the decolorizable ink itself, but a lower alkanol such as dipropanolamine and / or tripropanolamine is provided separately from the decolorizable ink occlusion body. By providing a dedicated amine ink absorber, the acid gas absorption capacity in the marking pen is dramatically increased while avoiding a direct effect on the ink erasing time, suppressing the ink density decrease and changing over time. It has improved stability against.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional front view showing an embodiment of the present invention, FIG. 2 is a vertical sectional front view of the same pen body, and FIG. 3 is a decolorable ink stabilizing occlusion body incorporated in the same pen body. It is a perspective view. In the figure, reference numeral 1 is a marking pen for decolorizable ink, which comprises a pen body 2 and a cap 3. In the pen body 2, there are respectively a fiber bundle-shaped decolorable ink storage body 4 and a decolorable ink stabilizing storage body 5 for bringing the storage body 4 into contact with the pen tip 6 and for facing the storage body 5 to the tail plug 7. So that it is built in. As described above, the occlusion body 4 has a decolorizing ink for marking in which a certain dye or indicator is colored by an aqueous solution of an alkali such as sodium carbonate, and an organic amine such as TEA and a moisturizer such as glycol are added thereto. It is impregnated. On the other hand, the lower alkanolamine itself (A) such as dipropanolamine and / or tripropanolamine or the concentrated liquid thereof is used alone in the occlusion body 5.
(B) or each of the mixed liquids (C) and (D) obtained by adding ammonia water to (A) and (B), respectively, is emitted from the decoloring ink impregnated in the occlusion body 4. The acid gas is sucked to prevent acidification of the atmosphere in the pen body 2. In this example, the occlusion body 5 is formed of a fiber bundle, but may be formed of a plastic foam.

FIG. 4 shows another embodiment. In this embodiment, the occlusion body 5 is built in the pen body 2 in the previous embodiment, whereas it is built in the cap 3. Therefore, in this case, although not shown, only the occlusion body 4 is built in the pen body 2.

An experimental example based on the above embodiment will be shown below. Experimental Example 1 Sodium carbonate (anhydrous) (3.0 g) was dissolved in water (63.3 g), and glycerin (33.0 g) was added to the solution.
Orthocresolphthalein 0.6 after adding 0.1 g of C
g was added and stirred to make 100 g of a mixed solution. Although the color of this solution was vivid and slightly reddish purple, the occlusion body 4 was impregnated with this solution as a decolorizing ink for marking. The occlusion body 4 was built in the pen body 2. On the other hand, TE
A 90% aqueous solution of A was similarly impregnated in the occlusion body 5, the occlusion body was built in the pen body 2, and the pen body 2 of the marking pen 1 was assembled. At this time, the same material was used for the occlusion body 4 and the occlusion body 5, and the size was cut to a length of 5: 1. In addition, TEA impregnated in the occlusion body 5 is 90
The filling amount of the aqueous solution of 4% was 4: 1 by weight with respect to the amount of the decoloring ink impregnated in the occlusion body 4. When writing on the surface of a map book printed using this marking pen 1, it is stable as compared with the one without the occlusion body 5 after a decrease in density was observed after about 1 month, and 12 months or more passed. However, no change was observed in the ink density.

Experimental Example 2 2.6 g of anhydrous sodium carbonate and 0.2 g of anhydrous potassium carbonate were dissolved in 66.5 g of warm water, 30.0 g of ethylene glycol was added thereto, 0.1 g of monopole oil was added, and then orthocresolphthalein 0.6 was added. g was added and stirred to make 100 g of a mixed solution. Although the color of this solution was vivid and slightly reddish purple, the occlusion body 4 was impregnated with this solution as a decolorizing ink for marking. The occlusion body 4 was built in the pen body 2. On the other hand, a solution prepared by mixing 85% aqueous solution of TEA and 0.1% aqueous ammonia was prepared as an acidic gas absorbent,
Similarly, the absorbent 5 is impregnated, and the absorbent 3 is capped.
The pen body 2 of the marking pen 1 was assembled. At this time, as in Experimental Example 1, the same material was used for the occlusion body 4 and the occlusion body 5, and the size was cut to a length of 5: 1. In addition, the TEA impregnated in the occlusion body 5
The filling amount of the 90% aqueous solution was 4: 1 by weight with respect to the amount of the decoloring ink impregnated in the occlusion body 4. When writing on the surface of a map book printed using this marking pen 1, it is stable as compared with the one without the occlusion body 5 after a decrease in density was observed after about 1 month, and 12 months or more passed. However, no change was observed in the ink density.

Experimental Example 3 The decolorizable ink prepared in Experimental Example 1 was used to impregnate the occlusion body 4. And this occlusion body 4 is the pen body
Built in. On the other hand, a 60% aqueous solution of diisopropanolamine was similarly impregnated into the occluding body 5, the occluding body was built in the pen body 2, and the pen body 2 of the marking pen 1 was assembled. As a result of carrying out a storage stability test of the decolorizable ink under the same conditions as in Experimental Example 1, the color density of the ink was extremely stable, and the density was reduced for 12 months or more as compared with a pen in which the occlusion body 5 was not enclosed. I was able to prevent it.

From the above experimental results, in the case of the marking pen 1 having the occlusion body 5 built-in, the handwriting remains at a practical density for a certain period of time and the ink holding property is extended as compared with the case where the occlusion body 5 is not built-in. I was confirmed. Further, as a result of experiments other than the above, as the absorbent of the acidic gas, the secondary to tertiary alkanolamine having a lower alkanol group and ammonia water were particularly effective. Organic amines are generally known as acidic gas absorbents, but the experimental results of the inventor indicate that not all organic amines are effective as gas absorbers. It was confirmed that the secondary and tertiary alkanolamines of No. 4 could be used, and that the concentrated solution was effective. The addition of ammonia water is also effective because it has the effect of volatilizing the alkaline gas and neutralizing the acidic gas in the pen body 2.

[0017]

According to the inventions of claims 1 and 2, it is possible to suppress a decrease in the density as compared with the case where the erasable ink stabilizing occlusion body is not built in as described above. Stabilization can be increased. Therefore, even when writing on paper or cloth, the handwriting can be left at a practical density for a certain period of time. The invention of claim 3 has an excellent effect that a marking pen having the occlusion body of claim 1 or 2 built in a pen body or a cap can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional front view of the above pen body.

FIG. 3 is a perspective view of an erasable ink stabilizing occlusion body incorporated in the pen body of the same.

FIG. 4 is a vertical sectional front view of a cap showing another embodiment.

[Explanation of symbols]

 1 Marking pen 2 Pen body 3 Cap 4 Decolorable ink storage 5 Decolorable ink storage 6 Pen tip 7 Tail plug

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B43K 23/08 C09D 11/16 PSW B43K 9/00 Z

Claims (3)

[Claims] 1. A marking pen for a decolorizable ink, which is built in and absorbs an acidic gas emitted from a decolorable ink occlusion body separately built in the pen to prevent acidification of an atmosphere in the marking pen. A secondary or lower tertiary alkanolamine or an aqueous solution containing 5% or more thereof, or a mixed solution obtained by adding 5% or less ammonia water to each of the lower alkanolamine and the amine 5% or more aqueous solution. A storage material for stabilizing a decolorizable ink, which is impregnated. 2. The erasable ink stabilizing occlusion body according to claim 1, wherein the secondary or tertiary lower alkanolamine is an alkanol group having 2 to 4 carbon atoms. 3. A marking pen for decolorizable ink, wherein the decolorable ink stabilizing storage material according to claim 1 or 2 is incorporated in a pen body or a cap.