JPH0420577A - Water-base ball point ink composition - Google Patents

Abstract

PURPOSE:To improve the lubricity and smoothness in writing and to prevent a written or drawn line from blotting by using a water-soluble dye and a soapwort extract as constituents. CONSTITUTION:A water-soluble dye selected from acid, direct, basic dyes, etc., is mixed with 0.1-5wt.% (solids) soapwort extract comprising an aqueous colloidal solution containing saponin, the principal component of the root of soapwort, and if necessary, a water-soluble organic solvent in an amount of 5-50wt.%, an antiseptic, a mildewproofing agent, a rust preventive, a pH adjustor, etc., and the balance of water.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a water-based ink for ballpoint pens that has excellent lubricity, provides good writing quality, and does not smudge written lines.

[Conventional technology]

Conventional water-based inks for ballpoint pens include water, water-soluble dyes,
A water-soluble organic solvent such as polyhydric alcohol or its derivative is contained as a main component. There are also types to which lubricants such as fatty acids or salts thereof are added for the purpose of increasing lubricity and improving writing taste.

[Problem to be solved by the invention]

However, generally speaking, increasing the lubricity of water-based ink for ballpoint pens tends to have the disadvantage that written lines tend to smear, so it has been a difficult problem to simultaneously improve lubricity and prevent smearing of written lines. Therefore, an object of the present invention is to provide an aqueous in-8 composition for ballpoint pens that has excellent lubricity and does not cause blurring of written lines.

[Means to solve the problem]

The present inventors conducted extensive research to solve the above-mentioned problems, and as a result, they discovered that the problems could be solved by blending a specific extract into a water-based ink, and completed the present invention.

That is, the present invention is a water-based ink composition for a ballpoint pen containing at least a water-soluble dye and a soapwort extract.

The water-soluble dye used here may be one used in general water-soluble inks, and can be selected from acid dyes, direct dyes, basic dyes, etc., and used singly or in combination. Soapwort extract is extracted from the soapwort (Sapronweed), which is grown in central and southern Europe or temperate Asia.
onaria 0rficinaIts L.), and soapwort root contains about 5% saponin and is used as an expectorant, and in folklore, it is also used as a diuretic and laxative.

This savonaria root contains 5aponaroside CL.
27] and 5aponaside D (129).Saponin, the main component of Saponaria root, creates a colloidal aqueous solution that is extremely foamy like soap.Saponaria extract is this colloidal aqueous solution, and the amount added is It is expressed as the weight percent of the solid content contained in the aqueous solution.The soapwort extract is added in an amount of 0.1 to 5.0% by weight, preferably 0.3 to 2.0% by weight, in the ink composition.

In addition, the ink of the present invention may contain known non-drying water-soluble organic solvents for the purpose of preventing drying and imparting antifreeze properties, such as polyhydric alcohols such as ethylene glycol, diethylene glycol, and glycerin, and glycosylation agents such as methyl cellosolve and butyl cellosolve. ethers, glycol esters such as ethylene glycol monomethyl ether acetate, etc. may be appropriately selected and contained alone or in combination of two or more. These water-soluble organic solvents can be added in an amount of 5 to 50% by weight in the ink composition, preferably 10 to 35% by weight. Furthermore, if necessary, auxiliary agents commonly used in aqueous inks such as preservatives, anti-mold agents, anti-rust agents, and pH adjusters may be included.

[For production]

Soapwort extract contains saponin, a triterpene-based glycoside that exhibits surface activity, and although the principle behind this extract is not clear, it improves lubricity and makes written lines less likely to smear. It has an effect.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples.

(Example 1) water Propylene glycol Poliocow Ethylenalyl Allyl Ether Phenol soapwort extract C11, Direct Blafuku #I9 40% of the above blended composition After that, it is cooled and further filtered. 62.7 (parts by weight) 24,0 0, 2 0.1 3.0 10, 0 Stir at ~60°C for 1 hour. A water-based black ink was obtained.

(Example 2) water glycerin Jv Beef Diethylene Full Hand Allyl Ether Phenol soapwort extract Edible No. 1 Example 1 The above blended composition I got a blue ink.

72.8 (parts by weight) 20,0 0,2 0.1 1,5 5,4 Water treated in the same manner as in Example 3 (Example 3) Water 63.5 (parts by weight) Ethylene glycol 28.0 Phenol 0. 1 Soapwort extract 2.0 Triethanolamine
0.1 Edible Red No. 102
6.3 The above blended composition was treated in the same manner as in Example 1 to obtain a water-based red ink.

After filling a ballpoint pen with the inks of each of the above examples and the comparative inks described below and writing for 500 meters using a writing tester, the amount of sinking of the ballpoint pen and the width of the writing line were measured, and a writing feel test was conducted.The results are as follows. As shown in the table. Furthermore, comparative example 1
The ink is an aqueous black ink obtained by processing the blended composition of Example 1 in the same manner as in Example 1, except that the soapwort extract was removed and the water content was 65.7 parts by weight. The ink of Comparative Example 2 was prepared by removing the soapwort extract from the formulation composition of Example 2 and instead reducing the water content to 7.
This is an aqueous blue ink obtained by treating the blended composition containing 4.3 parts by weight in the same manner as in Example 2. The ink of Comparative Example 3 is the same as that of the blended composition of Example 3 except for the soapwort extract. This is a water-based black ink obtained by treating a blended composition with a water content of 65.5 parts by weight in the same manner as in Example 3 instead.

Table 1 From the above table, each Example ink has a smaller amount of ball sinking than each Comparative Example ink, and therefore has excellent lubricity and a smooth writing feel. Furthermore, it is clear that the drawn line width is narrow and therefore it is difficult to bleed.

(Effects of the Invention) The water-based ink composition for ballpoint pens of the present invention solves the problems of improving lubricity and preventing blurring of written lines, which are difficult to achieve at the same time. This has the effect of reducing wear on the ball seat and providing clear writing lines without blur.

Claims (1)

[Claims] A water-based ink composition for a ballpoint pen, comprising at least a water-soluble dye and a soapwort extract.