JPS5832670A - Writing utensil - Google Patents

Abstract

PURPOSE:A writing utensil, prepared by the combination of a anhydrous ink containing a water-soluble coloring component and a vehicle without water as a writing part and an erasing solution obtained by dissolving an acid which is a decoloring component in a mixed solvent of water with a polar solvent other than the water as an erasing part, and easily erasable with certainty. CONSTITUTION:A writing utensil obtained by the combination of a writing part containing an ink consisting of a vehicle containing a resin, e.g. a ketonic resin, soluble in a polar solvent, e.g. methanol or ethylene glycol monomethyl ether, and a coloring component consisting of a dye, e.g. triphenylmethane dye, or acid-base indicator, e.g. phthalein, compatible with the vehicle and water, and capable of being colorless under acidic conditions and an erasing solution prepared by dissolving an acid, preferably citric acid, as a decoloring component in a mixed solvent consisting of water and a polar solvent other than the water. EFFECT:Capable of being written even on a nonabsorbing surface, and repeatedly written just after the erasing. No substance toxic to the human body is used therein.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a writing instrument comprising a combination of a writing part containing ink and an erasing part containing an ink erasing liquid capable of erasing the ink colorless.

This kind of writing implement has a pair of ink and ink erasing liquid, and can completely and surely erase the traces of the basket.
In general, although there are differences in each component, there is a combination of a water-based ink eraser for water-based ink and an oil-based ink eraser for oil-based ink. The former type of water-based ink is made by dissolving water-soluble coloring components in a water-based solvent, and is used exclusively for writing on absorbent surfaces such as paper, but it is also used for writing on non-absorbent surfaces such as plasti and kufilm. was difficult.

Also, water-based ink erasers generally use water as the main solvent because the coloring components of the water-based ink are water-soluble, and the parts must be wiped off with a pipe cloth after erasing. In most cases, the erased part may deteriorate or be damaged, which is extremely troublesome.

Also, depending on the type Ill#/C of the decolorizing component of the water-based ink eraser, it may be difficult to write repeatedly. I had to add Japanese ingredients.

On the other hand, the latter oil-based ink Fi = absorbing surface or non-absorbing surface [48] is possible, but the soap marks caused by the oil-based ink are water-resistant, and the coloring components such as dyes are It was water-insoluble. Therefore, the paired oil-based ink eraser is also composed of a single or mixed solvent K such as acetone, benzene, methyl ethyl ketone, etc. capable of dissolving and dispersing the coloring component, and a decolorizing component. However, decolorizing ingredients for the water-insoluble coloring ingredients that can stably exist in the solvent and have a decolorizing effect are said to be substances that are harmful to the human body. There were drawbacks.

The present invention was made in view of the above circumstances, and although the coloring component is water-soluble, the color vehicle is water-soluble. An anhydrous ink that does not contain water is composed, and a paired ink erasing liquid is composed by dissolving an acid, which is a decolorizing component, in a mixed solvent of water and a polar solvent other than water.
If these inks, ink, and erasing liquid are contained in the writing part and the erasing part of the writing instrument, it is possible to write on not only the absorbing surface but also the non-absorbing surface, and erasing of the handwriting is also possible. ! A writing utensil that can be used simply and reliably, and that can be used repeatedly after erasing? The purpose is to provide children.

The gauntlet of the present invention will be explained in detail below.

The ink contained in the writing @ contains a color vehicle made by dissolving a resin soluble in a polar solvent other than water, and the color vehicle and a dye or acid-base indicator that is soluble in water and becomes colorless when acidic. It consists of a coloring component. That is, it is an ink in which a coloring component such as the dye, which is water-soluble and also soluble in a polar solvent other than water, and which becomes colorless when acidified, is dissolved in a polar solvent other than water.

Therefore, the ink is an anhydrous ink in which the coloring component is water-soluble but the coloring agent does not contain water, so unlike general water-based inks, it is possible to write on not only absorbent surfaces but also non-absorbent surfaces. . A surfactant may be added to the ink in order to improve the solubility of coloring components, resins, etc., improve the stability of the ink over time, and further improve the wettability on non-absorbing surfaces. This anhydrous ink is paired with an ink erasing liquid made by dissolving an acid, which is a decoloring component for the coloring component of the ink, in a mixed solvent consisting of water and a polar solvent other than water. It is erased colorlessly. The ink erasing liquid is contained in the erasing part of the Hina marking tool. As mentioned above, since the coloring components of the ink are water-soluble and also soluble in polar solvents other than water, the pair of ink erasing liquids is capable of dissolving both water and polar solvents other than water. Can be used as main solvent for dispersion. Therefore, according to the present invention, after erasing the ink handwriting,
The ink erasing liquid evaporates immediately, so there is no need to wipe it off like with regular water-based ink erasers, and you can immediately write over and over again. E. The water that forms part of the main solvent has the role of controlling the entire volatilization rate of the erasing solution.
The hawking properties of water also serve to facilitate the contact of the erasing solution with handwriting on non-absorbing surfaces.8 In other words, if the color components are difficult to dissolve, the erasing solution is applied before they are completely dissolved and dispersed. The eraser does not volatilize], and by applying the eraser once on the eraser, the wettability of water ensures sufficient contact between the handwriting and the eraser. , no need for repeated coating operations! It is done in harmony. This prevents the colored components of the ink from migrating to the erasing section, and prevents the ability of the erasing liquid from decreasing with frequency of use. In addition, the decolorizing component does not decolorize water-insoluble coloring components like oil-based ink erasers, but it only needs to be able to decolorize water-soluble coloring components, and as mentioned above, substances harmful to the human body are used. You don't have to.

It should be noted that the specific structure of the writing part and the erasing part of the writing instrument is not limited to a specific one. Both the eraser and the eraser may have a combined structure with the pen core and the ink storage body, with one containing ink and the other containing ink erasing liquid, or other structures may be used.

Examples of polar solvents for the ink used in the present invention include methanol, monotanol, n-propanol, impropanol, n-butanol, isobutanol, sec-butanol, tertiary-butanol, etc. Alcohol, acetone, MEK
, ketones such as methyl isobutyl ketone, polyhydric amines such as ethylene glycol, monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, etc. , volatile polar solvents such as alcohol-based ethers. These solvents are used alone or as a mixed solvent. Since it is removed from water, the handwriting dries quickly and its adhesion to the writing surface is also improved. As the resin to be dissolved in the polar solvent, rosin, ester gum, ketone resin, and phenol resin may be used alone or in combination. The addition of this resin further improves the adhesion of handwriting, making it especially reliable for writing on non-absorbing surfaces.

Next, the dyes that are the coloring components of the ink include triphenylmethane dyes such as Ashi, Dopaiolet, ) 6B, and Brilliant Blue FCF, and xanthine dyes such as eosin, phloxine, Ashi, Dread, Erythrosine, Rose Bengal, and Quinoline Yellow. -ru. Other acid-base indicators that are coloring components include phthalein, benzene, sulfonephthalein, azo, triphenylmethane,
There are tro-type indicators for h, specifically Kena y Ginret, direct-jetrophenol, β-dinitrophenol,
T-jetrophenol, p-nitrophenol, m-
Nitrophenol, hinachrome, quinoline blue (cyanine), ethylbisacetic acid, o-cresol phthalein,
p-cresol phthalein, phenolphthalein, thymol phthalein, bromophenol purple, nidroaquine, trinitrobenzoic acid, 1,3,5-trinitro'benzene cape.

The polar solvent, which is one of the main solvents of the ink erasing liquid, is 1. This is similar to the polar solvent used as the vehicle for the ink. Examples of acids include inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, formic acid, acetic acid, benzoic acid, lactic acid, propionic acid, Schella acid,
Organic acids include cono-phosphoric acid, malic acid, tartaric acid, and citric acid. From a safety standpoint, carboxylic acids such as citric acid
It is desirable to use it. A mixed solvent consisting of water and the polar solvent other than water dissolves and disperses the water-soluble coloring component of the handwriting and is also soluble in polar solvents other than water in the mixed solvent, and at the same time The coloring component [decolorizes by converting into leuco form, etc., and immediately evaporates. With this K, you can immediately write repeatedly.

As mentioned above, the present invention provides a writing instrument comprising a combination of a writing part containing ink and an erasing part containing an ink erasing liquid capable of erasing the ink colorlessly (wherein the ink is removed by a polar solvent other than water). The ink erasing liquid is composed of a color vehicle formed by dissolving a soluble resin, and a color component such as a dye or an acid-base indicator that is soluble in water and becomes colorless in acidity. and a polar solvent other than water. Therefore, according to the writing instrument of the present invention, it is a water-soluble coloring component, which is different from general water-based inks.] , it is possible to write on not only absorbent surfaces but also non-absorbent surfaces.

Furthermore, since the resin is dissolved in the ink vehicle, the adhesion of writing to writing surfaces, especially non-absorbing surfaces, is improved. In addition, since the ink erasing liquid contained in the erasing part has the above-mentioned composition, the ink handwriting can be easily and reliably erased, and since the erasing liquid evaporates immediately after erasing, repeated writing can be avoided. It is possible. Unlike the erasing fluid for oil-based inks, the decolorizing component also needs to be one that can decolorize the water-soluble coloring component, so it is safe to use acids such as enoic acid. There is no need to use harmful substances in the ink erasing liquid.

Examples of the ink to be applied to the writing part of the writing instrument according to the present invention and examples of the ink erasing liquid are shown below.

Example 1 (purple ink) Acid Leadro B 3-Brilliant Blue FCF 191 Ketone Resin
5s ethylene glycol monomethyl ether 80-methanol 11
Example 2 (red ink) Eosin 3-Phloxin
13% quinoline yellow
α7Is rosin modified phenolic resin
3% ethylene glycol monomethyl ether 41
1G ethylene glycol monoethyl ether 411
G Example 3 (black ink) Ashi, Dubai au lait, ) 6 B 1.4 Brilliant Blue FCF 2.2-New Coccin 1.8 Brilliant Yellow
171 ketone resin
10-ethylene glycol monophthyl ether 8λ9
Example 4 (peach ink) 70 Xin 10 Tyrosine-modified phenolic resin 10-ethylene glycol monomethyl ether 80 Example of ink erasing liquid Citric acid 5-n-gropanol 40 Purified water
515% To explain the mechanism for erasing the traces of pink ink in Example 4, the coloring component phloxine
- Dissolved in a mixed solvent of propyl alcohol and purified water,
It is dispersed, forms an inner salt with citric acid, becomes leuco, becomes colorless, and evaporates.

Claims (1)

[Claims] A writing instrument comprising a combination of a writing part containing ink and an erasing part containing an ink erasing liquid capable of erasing the ink colorlessly, wherein the ink is formed by dissolving a resin soluble in a polar solvent other than water. The ink erasing liquid is composed of a color vehicle and a coloring component such as a dye or an acid-base indicator that is soluble in water and becomes colorless when acidified, and the ink erasing liquid is composed of water and a polar solvent outside the water plate. A writing instrument characterized by being composed of a mixed solvent <at-dissolved and having the following composition.