JPS6130917B2 - - Google Patents

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 type of writing instrument consists of a pair of ink and ink erasing liquid, and is capable of reliably erasing handwriting, but in general, although there are differences in each component,
The combination was a water-based ink eraser for water-based inks and an oil-based ink eraser for oil-based inks. 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 difficult to write on non-absorbent surfaces such as plastic film. It was hot.
The water-based ink eraser, which forms a pair with it, generally uses water as its main solvent because the coloring components of the water-based ink are water-soluble, and there are cases where the area must be wiped off with a cloth after erasing. In most cases, there is a risk of deterioration or damage to the erased portion, and it is also troublesome. Also, depending on the type of decolorizing component of the water-based ink eraser, it may be difficult to write repeatedly, and in such cases, it is necessary to add a neutralizing component to the ink component in advance to enable the above-mentioned repeated writing. It was impossible.

On the other hand, the latter oil-based ink can be written on both absorbing and non-absorbing surfaces, but since the handwriting made with this oil-based ink is water-resistant, coloring components such as dyes are non-water soluble. It was sexual. Therefore, the paired oil-based ink eraser also uses acetone, which can dissolve and disperse the coloring components.
It is composed by adding a decolorizing component to a single solvent or a mixed solvent such as benzene or methyl ethyl ketone. However, most of the decolorizing components for the water-insoluble coloring components that can stably exist in the solvent and perform the decolorizing action have the disadvantage that they are substances that are harmful to the human body.

The present invention has been made in view of the above circumstances, and the coloring component is water-soluble, but the coloring agent composes an anhydrous ink that does not contain water, and the paired ink erasing liquid is composed of water and a polar solvent other than water. By dissolving an organic acid, which is a decolorizing component, in a mixed solvent, and including these inks and ink erasing liquid in the writing part and erasing part of the writing instrument, it can be used on both the absorbing surface and the non-absorbing surface. Our purpose is to provide a writing instrument that is harmless to the human body, hygienic, and highly safe. be.

The writing implement of the present invention will be explained in detail below.
The ink contained in the writing part contains a color vehicle made by dissolving a soluble resin in a polar solvent excluding water, and a dye or an acid-base indicator that is soluble in water and becomes colorless in acidity. 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 soluble in polar solvents other than water and becomes colorless in acidic conditions, is dissolved in a polar solvent other than water. Therefore, this 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 not only on absorbing surfaces but also on non-absorbing 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 formed by dissolving an organic 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 by This ink erasing liquid is contained in the erasing section of the writing instrument. As mentioned above, since the coloring component of the ink is water-soluble and also soluble in polar solvents other than water, the paired ink erasing liquid dissolves and disperses handwriting in both water and polar solvents other than water. It can be the main solvent for
Therefore, according to the present invention, the ink erasing liquid evaporates immediately after erasing the ink handwriting, and there is no need to wipe it off unlike a general water-based ink eraser, and moreover, writing can be repeated immediately. Furthermore, the water, which forms part of the main solvent, also serves to control the volatilization rate of the erasing liquid and to facilitate the contact of the erasing liquid with handwriting on the non-absorbing surface due to the wettability of water. In other words, if the colored component is difficult to dissolve, the eraser is prevented from volatilizing before it is completely dissolved and dispersed, and by applying the eraser only once on the eraser, the water will wet the area. This ensures sufficient contact between the handwriting and the erasing liquid, thereby eliminating the need for repeated application operations. This prevents the colored components of the ink from moving toward the erasing section, and also prevents the ability of the erasing liquid from decreasing with frequency of use. Furthermore, the decoloring 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, so as mentioned above, substances harmful to the human body are not used. That's enough.

Note that the specific configurations of the writing section and erasing section of the writing instrument are not limited to specific ones. Both the writing part and the erasing part have a structure that combines a pen core and an ink absorber,
One may contain ink and the other may contain ink erasing liquid, or other structures may be used.

Examples of the polar solvent for the ink in the present invention include alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, and tertiary-butanol, acetone, MEK, ketones such as methyl isobutyl ketone, and ethylene. Volatile polar solvents include polyhydric alcohol ethers such as glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, and diethylene glycol monoethyl ether. These solvents are used alone or as a mixed solvent. Since water is removed, the handwriting dries quickly and its adhesion to the writing surface is 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 possible to write on non-absorbent surfaces.

Next, the dyes that are the coloring components of the ink are Ashitsu Violet 6B and Brilliant Blue.
Use triphenylmethane dyes such as FCF, and xanthene dyes such as eosin, phloxine, acid red, erythrosin, rose bengal, and quinoline yellow. Other acid-base indicators that are coloring components include phthalein-based, benzene-based, sulfonophthalein-based, azo-based, triphenylmethane-based, and nitro-based indicators, including quinaldine, α-dinitrophenol, and β-based indicators. -dinitrophenol, γ-dienylphenol, p-
Nitrophenol, m-nitrophenol, pinachrome, quinoline blue (cyanine), ethylbisacetic acid, o-cresol phthalein, p-quecresol phthalein, phenolphthalein, thymol phthalein, bromophenol purple, nitroamine, trinitrobenzoic acid, 1・3・5-
Examples include trinitrobenzene.

The polar solvent, which is one of the main solvents of the paired ink erasing liquid, is the same as the polar solvent used in the color vehicle of the ink. Organic acids include formic acid, acetic acid, benzoic acid, lactic acid, propionic acid, oxalic acid,
Examples include succinic acid, malic acid, tartaric acid, and citric acid. Among these organic acids, carboxylic acids such as citric acid are preferably used to enhance safety effects. A mixed solvent consisting of water and the polar solvent other than water dissolves and disperses the coloring component of the handwriting that is water-soluble and soluble in polar solvents other than water, and at the same time, the organic acid colors the handwriting. The components are decolorized by leuco form, etc., and immediately volatilized. This allows immediate and repeated writing.

As described above, the present invention includes a writing section containing ink and an ink erasing liquid capable of erasing the ink colorlessly.

In a writing instrument that is combined with an erasing part, the ink includes a color vehicle formed by dissolving a soluble resin in a polar solvent excluding water, and a dye or a dye that is soluble in water and becomes colorless under acidic conditions. The ink erasing liquid is composed of an organic acid dissolved in a mixed solvent consisting of water and a polar solvent other than water. Therefore, according to the writing instrument according to the present invention, unlike general water-based inks, it is possible to write on a non-absorbing surface as well as absorbing the ink using a water-soluble coloring component. Furthermore, since the resin is dissolved in the ink vehicle, the adhesion of writing to writing surfaces, especially non-absorbing surfaces, is improved. Furthermore, since the ink erasing liquid contained in the erasing part has the above composition, the ink handwriting can be easily and reliably erased, and the erasing liquid evaporates immediately after erasing.
Repeated writing is also possible. Unlike the erasing liquid for oil-based inks, the decolorizing component also only needs to be able to decolorize water-soluble coloring components, so safe organic acids such as citric acid can be used. The ink erasing liquid contained in the product does not contain any harmful substances that can have a negative effect on the human body, improving hygiene and safety.

Examples of ink and ink erasing liquid included in the writing portion of the writing instrument according to the present invention will be shown below.

Example 1 (Purple ink) Ash Dred 6B 3% Brilliant Blue FCF 1% Ketone resin 5% Ethylene glycol monomethyl ether 80% Methanol 11% Example 2 (Red ink) Eosin 3% Phloxin 1.3% Quinoline Yellow 0.7% Rosin modified phenolic resin 3% Ethylene glycol monomethyl ether 41% Ethylene glycol monoethyl ether 41% Example 3 (black ink) Ashizu Violet 6B 1.4% Brilliant Blue FCF 2.2% Newcoccin 1.8% Quinoline Yellow 1.7% Ketone resin 10% Ethylene glycol monobutyl ether 82.9 % Example 4 (pink ink) Phloxin 10% Rosin-modified phenolic resin 10% Ethylene glycol monomethyl ether 80% Example of ink erasing liquid Citric acid 5% n-propanol 40% Purified water 55% Pink ink of Example 4 above To explain the handwriting erasing mechanism, the blue component phloxine is dissolved in a mixed solvent of n-propyl alcohol and purified water.
It is dispersed, forms an inner salt with citric acid, becomes leuco, becomes colorless, and evaporates.

Claims (1)

[Claims] 1. A writing instrument consisting of a combination of a writing part containing ink and an erasing part containing an ink erasing liquid capable of erasing the ink colorless, in which the ink is an exfoliant made by dissolving a resin soluble in a polar solvent other than water. It is composed of a coloring agent, the coloring agent, and a coloring component such as a dye or an acid-base indicator that dissolves in water and becomes colorless when acidified, and the ink erasing liquid is a mixed solvent consisting of water and a polar solvent other than water. A writing utensil characterized by being composed of an organic acid dissolved in.