JPH0126385B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a water-based ink for ball-point pens, and more particularly to a water-based ink for ball-point pens that has excellent lubricity and has a smooth writing feel. Conventional water-based inks for ballpoint pens are made by adding direct dyes, acid dyes, basic dyes, etc. to an aqueous solution of water-soluble organic solvents such as glycol solvents, glycol ether solvents, glycol ether ester solvents, and amine solvents as evaporation inhibitors. This is a low-viscosity water-based ink made by dissolving a water-soluble dye and adding preservatives, anionic or nonionic surfactants as appropriate, but these water-based inks lack lubricity and cause problems between the ball and the chip. There is a lot of friction between the ball and the tip, causing abrasion noise when writing.
The problem is that the writing is not smooth, or the synthetic resin or metal ball receiving part is worn, and the clearance between the ball and the tip for ink to be drawn out is blocked, and the ink is drawn out to the tip of the ball. There was a problem in that the handwriting was insufficient, resulting in blurred handwriting and difficulty in writing smoothly. recent years,
Attempts have been made to add water-soluble cutting oil to water-based ink in order to solve these problems, but satisfactory effects have not been obtained, and new problems have arisen, such as blurring of handwriting. Therefore, the present inventors have completed the present invention as a result of intensive research to solve the above-mentioned problems. The gist of the present invention is a water-based ink for a ballpoint pen, which comprises at least 10% by weight of an ethylene oxide-added cationic activator, a water-soluble organic solvent, and water. What is particularly important in the present invention is the use of an ethylene oxide-added cationic activator for acid dyes and/or direct dyes, and the water-based ink of the present invention using an ethylene oxide-added cationic activator is It is not clear why it has excellent lubricity, prevents friction between the ball and the chip, and has the effect of preventing wear on the ball receiving part of the chip, but it is speculated as follows. Ethylene oxide addition type cationic activator is
Since it has a cationic group, it forms salts with acidic dyes and/or direct dyes to produce salt-forming dyes. This salt-forming dye has an appropriate balance of lipophilicity and hydrophilicity possessed by ethylene oxide, making it moderately oily, and by improving the lubricity between the tip and the ball, it prevents friction between the ball and the tip. ,
This seems to have the effect of preventing wear on the ball receiving part of the chip. The hydrophilicity of ethylene oxide is also thought to be due to the improved solubility of salt-forming dyes in water and water-soluble organic solvents. Next, each component used in the present invention will be explained in detail. Eiseneosin GH (C.
I.45380), Water Black #21 (CI15985,
42090, 42745 mixed dye), Nigrosine NB Conc (CI50420), Phloxin (CI45410), Eosin FA (CI45380), Soluble Blue-OBB (C.
I.42780), Soluble Blue-OBC (CI42755), and Brilliant Blue-FCF (CI42090).
EX (CI30235), Kayarasbruck G Conch (C.
I.355225), Direct Deep Black XA (C.
I.30235 analogs), Direct First Black B (CI35435), Diacotton First Orange WS (CI29156), Phthalocyanine Blue G
Conch (CI22311), Direct Sky Blue 5B
(CI24400), Direct Blue-2B (CI22610),
There are Nitsupon Orange GG Conc (CI23375), etc., which can be used alone or in combination, and the amount used is 0.1% of the total amount of ink.
-40% by weight, more preferably 0.5-30% by weight. Next, as ethylene oxide addition type cation activators, Esocard C/12, Esocard O/
12, Eso Card 18/12, Eso Card C/25, Eso Card O/25, Eso Card 18/25 (manufactured by Lion Armor Co., Ltd.), Anstex C-200 (manufactured by Toho Chemical Industry Co., Ltd.), etc. , or can be used in combination.The reason why the amount used is 10% by weight or less based on the total amount of ink is that if it is more than 10% by weight, the viscosity will increase and the flow of the ink will be poor. The lower the amount, the lower the lubricating effect, so preferably 0.5 to 10% by weight. Next, water-soluble organic solvents are those that are compatible with water and are used as auxiliaries, such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-butylene glycol, thiodiglycol, and ethylene glycol monomethyl. There are ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, sulfolane, formamide, sorbit, sorbitan, acetin, glycerin, etc., and these are selected and used as appropriate. can,
The amount used is preferably 1 to 40% by weight based on the total amount of ink. Further, the amount of water used as the main solvent is preferably 50 to 85% by weight based on the total amount of the ink. In addition to the above-mentioned components, penetrants such as various nonionic surfactants may be added in an amount of 5% by weight or less based on the total amount of ink, and in order to prevent ink flow inhibition due to mold growth. Preservatives such as sodium pentachlorophenol, phenol, and formalin; anticorrosive agents such as benzotriazole and ethylenediaminetetraacetate to prevent metal corrosion when metal is used in areas that come into contact with ink; and anticorrosive agents such as ethylenediaminetetraacetate. A water-soluble polymer substance or the like may be added as appropriate to improve fixing properties. Next, the method for manufacturing the ink of the present invention will be briefly described. The ink of the present invention can be produced by a simple operation of mixing and dissolving the above-mentioned components, but the ink can be obtained more easily by heating and stirring at an appropriate level. Hereinafter, the present invention will be explained in more detail with reference to Examples. In the Examples, "parts" simply represent "parts by weight." Example 1 Eisen Eosin GH (CI45380, Eisen Co., Ltd.)
5.0 parts Anstex C-200 (ethylene oxide addition type cation activator, manufactured by Toho Chemical Industry Co., Ltd.)
5.0 parts Propylene glycol 20.0 parts Water 69.0 parts Benzotriazole (corrosion inhibitor) 1.0 parts The above components were mixed and stirred for about 2 hours while heating to 40 to 60°C to obtain a red ink. Comparative Example 1 A red ink was obtained in the same manner as in Example 1, except that water was added in place of Anstex C-200 in Example 1. Example 2 Kayara Black G Conc (CI35255, manufactured by Nippon Kayaku Co., Ltd.) 6.0 parts Esocard C/12 (ethylene oxide-added cation activator, manufactured by Lion Armor Co., Ltd.)
1.0 parts Ethylene glycol 10.0 parts Thiodiglycol 10.0 parts Water 72.9 parts Score Roll 900 (nonionic surfactant, manufactured by Kao Atlas Co., Ltd.) 0.2 parts A black ink was obtained using the above components in the same manner as in Example 1. Comparative Example 2 A black ink was obtained in the same manner as in Example 2, except that Sunol NES (anionic surfactant, manufactured by Lion Armor Co., Ltd.) was added in place of Esocard C/12 in Example 2. Example 3 Nigrosine NB Conc (CI50420, manufactured by Sumitomo Chemical Co., Ltd.) 3.0 parts Direct Deep Black EX (CI30235,
Nippon Kayaku Co., Ltd.) 2.0 parts Esocard C/25 (ethylene oxide addition type cation activator, manufactured by Lion Armor Co., Ltd.)
2.0 parts Glycerin 15.0 parts Water 77.8 parts Sodium pentachlorophenol (preservative)
0.2 parts A black ink was obtained using the above components in the same manner as in Example 1. Comparative Example 3 The same procedure as in Example 3 was repeated except that Alucard 12-50 (cationic surfactant, manufactured by Lion Armor Co., Ltd.) was added in place of Esocard C/25 in Example 3, but ink could not be obtained. Nakatsuta. Example 4 Soluble Blue-OBB (CI42780, manufactured by Orient Chemical Industry Co., Ltd.) 4.0 parts Esocard O/12 (ethylene oxide addition type cation activator, manufactured by Lion Armor Co., Ltd.)
4.0 parts Esocard 18/25 (ethylene oxide addition type cation activator, manufactured by Lion Armor Co., Ltd.)
3.0 parts diethylene glycol 10.0 parts sulfolane 10.0 parts water 69.0 A blue ink was obtained using the same ingredients as in Example 1. Comparative Example 4 A blue ink was obtained in the same manner as in Example 4, except that Esocard O/12 of Example 4 was removed, Esocard 18/25 was reduced to 0.3 parts, and water was added accordingly. Comparative Example 5 Blue was prepared in the same manner as in Example 4, except that the amount of Esocard O/12 in Example 4 was increased from 4.0 parts to 6.0 parts, and the amount of Esocard 18/25 was increased from 3.0 parts to 5.0 parts, and water was removed by that amount. Got the ink. Comparative Example 6 Eso Card O/12 of Example 4, Eso Card 18/
New Paul 75H-900 instead of 25
A blue ink was obtained in the same manner as in Example 4 except that (water-soluble cutting oil, manufactured by Sanyo Chemical Industries, Ltd.) was added. The inks obtained in Examples 1 to 4 and Comparative Examples 1 to 6 were filled into a commercially available metal tip ballpoint pen (tip material: brass, ball material: tungsten carbide-containing steel, ball diameter: 0.6 mm), and the writing distance was Table 1 shows the results of testing for the amount of ball sinking after writing, and the presence or absence of unpleasant sounds during writing.

【table】

【table】

[Table] As described above, when the ink of the present invention is used in a water-based ballpoint pen, it has excellent abrasion prevention effect and lubricity between the metal ball and the tip, and even when the tip is made of synthetic resin such as polycarbonate other than metal. This is a water-based ink for ballpoint pens that has excellent abrasion resistance, greatly extending the writing distance for smooth writing, and has the same properties as conventional inks in terms of blurring and set-off of handwriting. .

Claims (1)

[Claims] 1. A water-based ink for a ballpoint pen, comprising at least an acid dye and/or a direct dye, an ethylene oxide-added cation activator of 10% by weight or less based on the total amount of the ink, a water-soluble organic solvent, and water.