JPH064806B2 - Water-based ink for ballpoint pens - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to prevention of bleeding of drawn lines of water-based ink for ballpoint pens.

(Prior Art) A conventional water-based ink for ballpoint pens is formed by mixing a water-soluble dye aqueous solution with a water-soluble organic solvent such as a polyhydric alcohol or a derivative thereof. There are also various fatty acid soaps and salts thereof added for the purpose of further improving lubricity. However, the improvement of lubricity causes the adverse effect that the written lines are more likely to bleed.

(Problems to be Solved by the Invention) An object of the present invention is to provide a water-based ink for ball-point pens that has excellent lubricity and is less likely to cause writing lines to bleed.

(Means for Solving the Problems) In order to achieve the above object, the water-based ink for a ballpoint pen of the present invention is characterized by containing a water-soluble dye and a stevia extract represented by the following general formula as at least a blending component. Is configured as.

General formula (R ₁ represents 1. or 2 glucose, or hydrogen, and R ₂ represents 2 or 3 glucose, or 2 glucose and 1 rhamnose.) Here, it is represented by the above general formula. Stevia extract is a plant of the genus Stevia of the Asteraceae family originating from South America (Paraguay, etc.) in terms of odor, and is particularly extracted from the species name Rebaudiana Bertoni among 154 or more species of the genus Stevia. A sweet component, which is G in the above general formula, G is rhamnose, R is the number in parentheses,
Further, when hydrogen is represented by H, R ₁ is G (1) and R ₂ is G (2).
Combinations of stevioside, lever Ude Io Side A (monoglycosides seal stevioside side) of R ₁ is in G (1) R ₂ is G (3), R ₂ R ₁ is in G (1) is G (2) and R Rebaudioside C (Dalcoside B) of ( ₁ ), R ₁ is H and R ₂ is G (2) and R
_{1 is} a rebaudioside D with R ₁ is G (2) and R ₂ is G (3), and R ₁ is a rebaudioside E with R ₁ is G (2) and R ₂ is G (2). is there. The Stevia extract is contained in the ink composition in an amount of 0.1 to 10.0% by weight, preferably 0.3 to 5.0% by weight.

Next, the water-soluble dye to be contained in the present invention may be one that is used in ordinary water-soluble inks, and may be selected from acid dyes, direct dyes, basic dyes, etc. independently or in combination of several types. Can be used.

Since the present invention is a water-based ink, known non-drying water-soluble organic solvents, for example, polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, and glycerin, and methyl cellosolve, for the purpose of preventing drying and imparting antifreeze. It is possible to appropriately select from glycol ethers such as butyl cellosolve and glycol esters such as ethylene glycol monomethyl ether acetate, etc., and add them alone or in combination of several kinds. These water-soluble organic solvents may be added to the ink composition in an amount of 5 to 40% by weight, preferably 15 to 30% by weight.

The ink composition of the present invention may further contain, if necessary, auxiliaries commonly used in aqueous ink compositions such as preservatives, mildew-proofing agents and pH regulators, and fatty acids and their additives as lubricants. It is also possible to include substances selected arbitrarily from salts alone or in combination of several kinds.

(Function) When the Stevia extract is contained in the ink composition as in the present invention, the reason is not clear, but an ink in which the drawn line is less likely to bleed and the lubricity is slightly improved is born. Further, even if a lubricant is used together to improve lubricity, the bleeding prevention effect does not deteriorate.

(Example) Example 1. Water 61.8 (wt%) Ethylene glycol 30.0 Polyoxyethylene alkylallyl ether 0.1 (Scoreroll # 900 Kao Corporation) Phenols [preservative] 0.1 Stevioside 2.0 (Pure Marmiron Y Maruzen Kasei Co., Ltd.) Edible Aka No. 102 6.0 The above-mentioned compounded composition was stirred at 40 to 60 ° C. for 1 hour, cooled, and then filtered to obtain an aqueous red ink. In Comparative Example 1, a composition containing no stevioside in the composition components of Example 1 but containing 63.8% by weight of water was treated in the same manner as in Example 1 to obtain an aqueous red ink. .

Example 2. Water 57.7 (wt%) Ethylene glycol 30.0 Polyoxyethylene alkylallyl ether 0.2 (Scoreroll # 900 manufactured by Kao Corporation) Phenols [preservatives] 0.1 Sodium linoleate 0.5 Stevioside 1.5 (SK Suito Sanyo Kokusaku Pulp) CI Direct Black # 19 10.0 The above composition was treated in the same manner as in Example 1 to obtain an aqueous black ink. As Comparative Example 2, without using stevioside and sodium linoleate in the compounding ingredients of Example 2,
Instead, the compounded composition containing 59.7% by weight of water was treated in the same manner as in Example 2 to obtain the same aqueous black ink.

Example 3. Water 61.9 (wt%) Ethylene glycol 30.0 Polyoxyethylene alkylallyl ether 0.2 (Scoreroll # 900 manufactured by Kao Corporation) Phenols [preservatives] 0.1 Sodium oleate 0.8 Stevioside 1.0 (Marmiron 50 Maruzen Kasei Co., Ltd.) Food Blue No. 1 6.0 The above composition was treated in the same manner as in Example 1 to obtain an aqueous blue ink. As Comparative Example 3, a compounding composition of Example 3 was prepared without using stevioside and sodium oleate in the compounding ingredients of Example 3, but using 63.7% by weight of water.
A water-based blue ink was obtained in the same manner as above.

Using the inks of each of the above-mentioned Examples and Comparative Examples, a pen tester was used to perform a sensory test on the writing feeling by measuring the sinking amount of the ball and the line width of the ballpoint pen after writing 500 m with a writing tester. Got

(Effect of the invention) The present invention is as described above, and as is clear from the measurement and test results of the above-mentioned examples, it has an effect of preventing bleeding of drawn lines at the same time while having excellent lubricity, You can get a smooth brush stroke and a clear stroke.

Claims (1)

[Claims] 1. A water-based ink for ballpoint pens, which contains a water-soluble dye and a stevia extract represented by the following general formula as at least a compounding component. General formula (R ₁ represents 1 or 2 glucose, or hydrogen, and R ₂ represents 2 or 3 glucose, or 2 glucose and 1 rhamnose.)