JPH0637603B2 - Water-based ink for ballpoint pens - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water-based ink for ballpoint pens, which has excellent lubricity, has a good writing quality, and is free from blurring of writing lines.

(Prior Art) Conventional water-based inks for ballpoint pens include water, water-soluble dyes,
A water-soluble organic solvent such as a polyhydric alcohol or its derivative is contained as a main component. In addition, there are those to which a lubricant such as a fatty acid or a salt thereof is further added for the purpose of enhancing lubricity and improving writing taste.

(Problems to be solved by the invention) In general, when the lubricity of a water-based ink for ballpoint pens is increased, there is a tendency that a writing line easily bleeds. Therefore, it is necessary to improve lubricity and prevent bleeding of the writing line. There was a difficult task. Therefore, an object of the present invention is to provide a water-based ink for a ballpoint pen, which has excellent lubricity and does not cause bleeding of writing lines.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the water-based ink for a ballpoint pen of the present invention is characterized by containing at least a water-soluble dye, a mukurodi peel extract, and a fatty acid or a salt thereof. It is composed.

Here, the water-soluble dye may be one that is used in general water-soluble inks, and it is possible to arbitrarily select from acid dyes, direct dyes, basic dyes and the like, and to use alone or in combination of several kinds. . The sucrose peel extract can be added to the ink composition in an amount of 0.1 to 5.0% by weight, preferably 0.3 to 2.0% by weight. The fatty acid or its salt can be added to the ink composition in an amount of 0.1 to 2.0% by weight, preferably 0.5 to 1.0% by weight. As the fatty acid, those generally used in water-soluble soaps and the like may be used, and those having a carbon number of about 16 to 20 are preferable. Particularly, those having about 18 carbon atoms are preferable and may be saturated or unsaturated. As the salt, those such as sodium and potassium are used.

In addition to the ink of the present invention, other known non-drying water-soluble organic solvents for the purpose of preventing drying and imparting anti-freezing property, for example, polyhydric alcohols such as ethylene glycol, diethylene glycol and glycerin, and glycols such as methyl cellosolve and butyl cellosolve. Ethers and glycol esters such as ethylene glycol monomethyl ether acetate may be appropriately selected and contained alone or in combination of two or more kinds. These water-soluble organic solvents can be added to the ink composition in an amount of 5 to 40% by weight, preferably 15 to 30% by weight. Further, if necessary, auxiliary agents commonly used in water-based inks such as antiseptics, antifungal agents, and pH adjusters may be added.

(Action) The sucrose pulp (also known as Enmei skin) contains saponin, which is a triterpene-based glycoside that exhibits surface activity, and the principle is not clear because it contains both sucrose pulp extract and fatty acid or its salts. Has the effect of improving the lubricity and preventing the drawn lines from bleeding.

(Example) Example 1 Water 61.6 (% by weight) Ethylene glycol 30.0 Polyoxyethylene alkylallyl ether 0.1 Phenol 0.1 Potassium oleate 0.2 Mukuroji peel extract 2.0 (Muroji extract powder made by Maruzen Kasei) Edible Red No. 102 6.0 The above composition The product was stirred at 40 to 60 ° C for 1 hour, cooled, and then filtered to obtain a water-based red ink.

Example 2 Water 57.7 (wt%) Ethylene glycol 30.0 Polyoxyethylene alkylallyl ether 0.2 Phenol 0.1 Sodium ricinoleate 0.5 Mukuroji pericarp extract 1.5 (Murozen Kasei Mukuroji extract powder) CI Direct Black # 19 10.0 The above composition was carried out. The same procedure as in Example 1 was carried out to obtain a water-based black ink.

Example 3 Water 61.9 (% by weight) Ethylene glycol 30.0 Polyoxyethylene alkylallyl ether 0.2 Sodium oleate 0.8 Phenols 0.1 Mukurodi peel extract 1.0 (Makurosi extract powder manufactured by Maruzen Kasei) Food Blue No. 6.0 The above-mentioned composition was prepared as an example. A water-based blue ink was obtained by treating in the same manner as in 1.

The ink of each of the above-described examples and the ink of the comparative example described below were filled in a ballpoint pen, and after writing with a writing tester for 500 m, the sinking amount of the ball and the width of the drawn line were measured and a writing test was performed. The results are shown in the table below. The ink of Comparative Example 1 was the same as in Example 1 except that the extract of syrup and the sodium oleate in the composition of Example 1 were removed, and the water content was replaced by 63.8% by weight. It is an aqueous red ink obtained by the treatment, and the ink of Comparative Example 2 has a water content of 59.7 instead of the mukurodi peel extract and sodium ricinoleate in the composition of Example 2.
It is an aqueous black ink obtained by treating the blended composition in a weight percentage of 1 in the same manner as in Example 2, and the ink of Comparative Example 3 contains the mukurodi peel extract and sodium oleate in the blended composition of Example 3. Except for this, a water-based blue ink obtained by treating the compounded composition having a water content of 63.7% by weight in the same manner as in Example 3 was obtained.

From the above table, it is clear that the inks of the respective examples have less ball sinking amount than the inks of the comparative examples, and therefore have excellent lubricity, smooth writing feeling, and narrow drawing line width, and accordingly are less likely to bleed.

(Advantages of the Invention) The present invention is as described above, in which a difficult problem of improving lubricity and preventing bleeding of a writing line is solved, and the writing feeling is improved, and in a ball holder that holds a ball. There is an effect that wear of the ball seat is reduced and a clear writing line is obtained.

Claims (1)

[Claims] 1. A water-based ink for ballpoint pens, which contains at least a water-soluble dye, a sucrose pulp extract, and a fatty acid or a salt thereof.