JPH02311576A - Water-based ink for ballpoint pen - Google Patents

Abstract

PURPOSE:To improve lubricating properties and to decrease blotting of writings by incorporating a water-soluble dye and a specified stevia extract. CONSTITUTION:A water-soluble dye (e.g. C.I. Direct Black-19), 0.1 to 10.0wt.% stevia extract of the formula (wherein R1 is one or two glucoses or H; R2 is two or three glucoses or two glucoses and one rhamnose), 5 to 40wt.% non- drying water-soluble org. solvent (e.g. ethylene glycol) and, if necessary, an antiseptic, a mildewproofing agent, a pH adjusting agent, a lubricant, etc., are dissolved in water.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to prevention of bleeding of drawn lines of water-based ink for ballpoint pens.

(Prior Art) Conventional water-based inks for ballpoint pens are composed of an aqueous solution of a water-soluble dye and a water-soluble organic solvent such as a polyhydric alcohol or its derivative.

Furthermore, there are also products to which various fatty acid soaps and their salts are added for the purpose of improving lubricity. .

However, improving the lubricity has the disadvantage that written lines become more likely to smudge.

(Problems to be Solved by the Invention) An object of the present invention is to provide a water-based ink for ballpoint pens that has excellent lubricity and prevents written lines from blurring.

(Means for Solving the Problems) In order to achieve the above object, the water-based ink for ballpoint pens of the present invention is characterized in that it contains at least a water-soluble dye and a stevia extract represented by the following general formula as ingredients. It is constructed as follows.

(RI represents 10 or 2 glucose, or hydrogen, and R2 represents 2 or 3 glucose, or 2 haglucose and 1 rhamnose.) Stevia extraction represented by the above general formula Specifically, 6D is a plant of the Stevia genus of the Asteraceae family that is native to South America (Paraguay, etc.), and in particular, it is a sweet ingredient extracted from the species name Levacdiana Bertoni, which is one of the more than 154 species of the Stevia genus. In the above general formula, glucose is G.

If rhamnose is represented by R1 and their number is represented by the number in the square, and hydrogen is represented by H-, & is G (1) and the crow is G.
(2) combination of stevioside, R1 is G(1) and R
Rebaudioside A (monoglycosyl stevioside) where 2 is G(3), R1 is G(1) and R2 is G(2)
and R(1) Rebaudioside C (Darcoside B
), Darcoside A where R8 is H and R2 is G(2) and R(1), Rebaudioside D where R1 is G(2) and R2 is G(3)% R1 is G(2) and the horse is Examples include G(2) rebaudioside E. This stevia extract is contained in the ink composition at o, 16 to 10. ○% by weight, preferably 0
．． The content is 3 to 5.0% by weight.

Next, the water-soluble dyes to be contained in the present invention may be those used in ordinary water-soluble inks, and may be arbitrarily selected from acid dyes, direct dyes, basic dyes, etc., singly or in combination of several types. can be used.

Furthermore, since the present invention is a water-based ink, for the purpose of preventing drying and imparting antifreeze properties, it is necessary to use known non-drying water-soluble organic solvents, such as polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, and glycerin. , methyl cellosolve, putirce, losolp, etc., and glycol esters such as ethylene glycol monomethyl ether acetate, etc., and can be added singly or in combination. These water-soluble organic solvents may be added in an amount of 5 to 40% by weight, preferably 15 to 30% by weight, in the ink composition.

The ink composition of the present invention may further contain auxiliary agents commonly used in aqueous ink compositions such as preservatives, antifungal agents, and pH regulators, as required.Also, as lubricants, fatty acids and It is also possible to contain substances arbitrarily selected from salts, either singly or in combination.

(Function) When a stevia extract is contained in an ink composition as in the present invention, an ink is created in which drawn lines are less likely to smear and the lubricity is slightly improved, although the reason is not clear. Furthermore, even if a lubricant is used in combination to enhance the lubricity, the bleed prevention effect will not deteriorate.

(Example) Example 1゜Water 61.8 (
Weight%) Ethylene glycol 30.0
Phenol (preservative) 0.1 Edible Red No. 102 6.0 The above blended composition was stirred at 40 to 60'C for 1 hour, cooled, and filtered to obtain a water-based red ink. In addition, as Comparative Example 1, a compounded composition in which stevioside among the compounded components of Example 1 was not used, but instead water was used at 63.8% by weight, was treated in the same manner as in Example 1, and the same water-based red ink was produced. I got it.

Example 2゜Water 57.7
(!i%) Ethylene glycol 30.
0 Phenol [preservative] 0.1 Sodium linoleate 0.50.1. Direct black ÷ 19 10.0 The above blended composition was treated in the same manner as in Example 1 to obtain a water-based black ink. In addition, as Comparative Example 2, a blended composition in which stevioside and sodium linoleate in the blended components of Example 2 were not used, but instead water was used at 597% by weight, was treated in the same manner as in Example 2, and the same water-based composition was prepared. I got black ink.

Example 3 Water 61.9 (wt%) Ethylene glycol 30.0 Polyoxyethylene alkyl allyl ether 0.
2 (Score Roll + 900 manufactured by Kao ■) Phenol (preservative) o, 1 Sodium oleate 0.8 Stevioside 1.0 (Marmiron 50 manufactured by Maruzen Kasei ■) Pre-edible No. 1 6.0 The above compounded composition was used as an example A water-based blue ink was obtained by processing in the same manner as in 1. In addition, as Comparative Example 3, a blended composition in which stevioside and sodium oleate were not used in the blended components of Example 3, but water was added at 63.7% by weight was treated in the same manner as in Example 3, and the same aqueous composition was prepared. I got blue ink.

Using the inks of each of the above Examples and Comparative Examples, the amount of sinking of the ball and the width of the drawn line in the ballpoint pen were measured after 9500 m1 of writing was done using a writing tester, and a sensory test of the writing feel was also conducted. Got the results.

(Effects of the Invention) The present invention is a method of constriction, and as is clear from the measurement and test results of the above-mentioned examples, it has an effect of preventing drawn lines from blurring while having excellent lubricity. You can get a smooth brush feel and clear lines.

Claims (1)

[Scope of Claims] A water-based ink for a ballpoint pen, comprising at least a water-soluble dye and a stevia extract represented by the following general formula as ingredients. General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (R_1 indicates 1 or 2 glucose, or hydrogen, R_2 indicates 2 or 3 glucose, or 2 glucose and 1 rhamnose.)