JPH09169942A - Water-based ink composition for ball point pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a water-based ink composition for ball point pen, comprising a specific mercaptotriazole, a colorant and water, showing high lubricity to reduce the abrasion of the ball holder at the tip, give smooth pen touch and drawn lines of reduced bleeding. SOLUTION: This ink composition comprises (A) 3-amino-5-mercapto-1,2,4- triazole, (B) a colorant such as inorganic pigment, organic pigment or water-soluble dye and (C) water, preferably in amounts of 0.01-10wt.%, 0.05-30wt.% and 40-90wt.% based on the total amount of the composition, respectively. When necessary, this composition contains, in addition, (D) 5-40wt.% of a water-soluble organic solvent and (E) 0.1-10wt.% of a dispersant such an nonionic surfactant, anionic surfactant, water-soluble high polymer or the like.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an aqueous ink composition for ballpoint pens.

[0002]

2. Description of the Related Art In aqueous ink compositions for ballpoint pens, water-soluble, high-boiling organic solvents such as polyhydric alcohols such as glycol and glycerin are used as a drying inhibitor in addition to water. However, in such an aqueous ink, the frictional resistance between the ball of the chip and the ball holder increases when the ball rotates during writing,
There are drawbacks such that the ball seat is significantly worn and the writing feeling is deteriorated, or the ink is outflowed unevenly due to the deterioration of the tip. It has been attempted to add a lubricity improver for the purpose of improving such defects.
Japanese Patent Publication No. 62-58394 discloses an ink containing an unsaturated fatty acid or a water-soluble cutting agent as a lubricant. However, in such a conventional method, even if these additives are added to the ink, the lubricity is not sufficient, and the phenomenon that the writing is impossible due to the abrasion of the ball seat occurs, or even the sufficient lubricity is obtained. However, on the other hand, there is a practical problem that the surface tension of the ink is remarkably reduced, and the handwriting is likely to bleed.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve the above-mentioned problems, and it is excellent in lubricity and smooth ball rotation reduces wear of the tip holder seat, It is an object of the present invention to provide a water-based ballpoint pen ink having a smooth writing feel and excellent non-drying property.

[0004]

The inventors of the present invention have conducted various studies to solve the above-mentioned problems, and as a result, 3
It was found that the above object can be achieved by incorporating -amino-5-mercapto-1,2,4-triazole, and the present invention has been completed based on this finding. That is, the aqueous ink composition for a ball-point pen of the present invention is characterized by containing 3-amino-5-mercapto-1,2,4-triazole, a colorant and water. Where 3-amino-5-mercapto-1,
The content of 2,4-triazole is preferably 0.01 to 10% by weight, more preferably 0.1 to 10% by weight based on the total amount of the composition.
~ 5% by weight. Further, the colorant is preferably 0.05 to 30% by weight and the water is preferably 40 to 90% by weight with respect to the total amount of the composition.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION 3 used in the ink composition of the present invention
-Amino-5-mercapto-1,2,4-triazole has the formula

Embedded image The content in the ink composition is 0.01 to 10% by weight, preferably 0.1 to 5% by weight. If it is less than 0.01% by weight, sufficient lubricity cannot be obtained and improvement in writing performance cannot be expected.
If the temperature exceeds the limit, the phenomenon of ink composition precipitation due to aging will occur, and the ink used in the ballpoint pen of the batting method that uses an ink occlusion body or induction core, or the ballpoint pen of the direct storage method that uses an ink storage tube that directly stores the ink. Is not preferable because the viscosity rises and the ink outflow from the pen tip during writing deteriorates.

A water-soluble organic solvent may be used in the ink composition of the present invention. As the solvent, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 2,3-butanediol, 1,3-butanediol, 1,4-butanediol,
1,2-Pentanediol, 1,5-Pentanediol, 2,5-Hexanediol, 3-Methyl-1,3-butanediol, 2-Methylpentane-2,4-diol, 3-Methylpentane-1,5 -Diol, 1,2,
3-butanetriol, 1,2,4-butanetriol, 3-methylpentane-1,2,5-triol,
Alkylene glycols such as 1,2,3-hexanetriol, polyalkylene glycols such as polyethylene glycol and polypropylene glycol, glycerols such as glycerol, diglycerol and triglycerol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol Lower alkyl ethers of glycols such as monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono-n-butyl ether,
Thiodiethanol, N-methyl-2-pyrrolidone, 1,
Examples thereof include 3-dimethyl-2-imidazolidinone and sulfolane. The content of the water-soluble organic solvent is usually 40% by weight or less, preferably 5 to 40% by weight, based on the total composition. If the amount exceeds 40% by weight, the ink may strike through when writing on paper or it may be difficult to dry, which is not preferable. These solvents also improve the non-dryness of the ink.

The colorants used in the ink composition of the present invention are pigments and water-soluble dyes. The type of pigment is not particularly limited, and any of inorganic and organic pigments conventionally used for water-based inks can be used, and inorganic fluorescent pigments and organic fluorescent pigments can also be used. Examples of the inorganic pigments include titanium oxide, carbon black, red iron oxide, chromium oxide, iron black, cobalt blue, alumina white, iron oxide yellow, viridian, zinc oxide, lithopone, cadmium yellow, vermilion, cadmium red, white carbon, clay. , Talc, ultramarine, sedimentary barium, barite powder, calcium carbonate, white lead, dark blue,
Manganese violet, aluminum powder, nickel powder,
Examples include copper powder and zinc powder. Examples of organic pigments include azo lakes, insoluble azo pigments, chelate azo pigments, phthalocyanine pigments, perylene and perinone pigments, anthraquinone pigments, quinacridone pigments, dye lakes, nitro pigments and nitroso pigments. Specifically, phthalocyanine blue (C.I.
0), phthalocyanine green (C.I. 7426)
0), Hansa Yellow 3G (C.I. 11670), Bisazo Yellow GR (C.I. 21100), Permanent Red 4R (C.I. 12335), Brilliant Carmine 6B (C.I. 15850), Quinacridone Red (C). .I.46500) and the like can be used.

As the inorganic fluorescent pigment, a heavy metal salt such as zinc sulfide or a sulfide of an alkaline earth metal is used as a raw material, and a trace amount of an activator such as copper, silver or manganese is added to these high purity ones. It is made by firing at high temperature. The organic fluorescent pigment is a solid solution in which a fluorescent dye is dissolved in a vehicle of synthetic resin. Examples of the synthetic resin include vinyl chloride resin, alkyd resin, and alkali resin, and examples of the fluorescent dye include C.I. I. Azide Yellow 7, C.I.
I. Basic Red 1 etc. These pigments may be used alone or in combination of two or more. The content is usually selected in the range of 2 to 30% by weight, preferably 5 to 15% by weight, based on the total weight of the entire composition. When stored over 30% for a long period of time, the pigment aggregates and the pen tip becomes clogged, resulting in poor writing.

As the water-soluble dye, any of direct dye, acid dye, food dye and basic dye can be used. In addition, a fluorescent dye that can obtain a clear hue can be used. Examples of the direct dye include C.I. I. Direct Black 17, Same 19, Same 22, Same 32, Same 38, Same 5
1, 71, C.I. I. Direct Yellow 4, the same 26, the same 44, the same 50, C.I. I. Direct Red 1, 4, 3, 23, 31, 37, 39, 75, 80, 8
1, the same 83, the same 225, the same 226, the same 227, C.I. I.
Direct Blue 1, 1, 15, 71, 86, 10
6 and 119.

Examples of acid dyes include C.I. I. Acid Black 1, 2, 24, 26, 31, 31, 5
2, 107, 109, 110, 119, 15
4, C.I. I. Acid Yellow 7, 17, 19, 2
3, 25, 29, 38, 42, 49, 6
1, the same 72, the same 78, the same 110, the same 141, the same 127,
135, 142, C.I. I. Acid Red 8, 9, 14, 18, 18, 26, 27, 35, 3
7, 51, 52, 57, 82, 87, 9
2, 94, 111, 129, 131, 13
8, ibid 186, ibid 249, ibid 254, ibid 265, ibid 27
6, C.I. I. Acid Violet 15, 17, 17, C.I.
I. Acid Blue 1, 7, 7, 9, 15, 22,
23, 25, 40, 41, 43, 62, 78, 83, 90, 93, 103, 112,
113, 158, C.I. I. Acid Green 3, 9, 16, 25, and 27.

Most of the food dyes are contained in the direct dyes or the acid dyes.
C. I. Food Yellow 3 is an example. Examples of the basic dye include C.I. I. Basic Yellow 1, 2, 2, 21, C.I. I. Basic Orange 2, 14 and 3
2, C.I. I. Basic Red 1, Same 2, Same 9, Same 1
4, C.I. I. Basic Violet 1, same 3, same 7,
C. I. Basic Brown 12, C.I. I. Basic Black 2, 8 and the like. These dyes may be used alone or in combination of two or more, and the content in the entire composition is usually 0.5 to
It is in the range of 30% by weight, preferably 1 to 15% by weight.
When it is stored for more than 30% by weight for a long period of time, the dye may be deposited and the pen tip may be clogged, resulting in writing failure. If it is less than 0.5, the coloring becomes weak and the hue when written on paper cannot be seen, which is not preferable.

When a pigment is used as a colorant, the dispersant is necessary for dispersing the pigment. The dispersant is adsorbed on the surface of the pigment particles to disperse the pigment in water. Usually, nonionic, anionic surfactants and water-soluble polymers are used. Preferably, a water-soluble polymer is used.

As the nonionic surfactant, there are polyoxyalkylene higher fatty acid ester, higher fatty acid partial ester of polyhydric alcohol, higher fatty acid ester of sugar, and the like. Specifically, fatty acid ester of glycerin, polyglycerin fatty acid ester, Propylene glycol fatty acid ester, pentaerythritol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, pentaerythritol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyethylene glycol fatty acid ester, poly Oxyethylene alkyl ether, polyoxyethylene phytosterol, polyoxyethylene polyoxypropylene alkyl Ether, polyoxyethylene alkylphenyl ether, polyoxyethylene castor oil, polyoxyethylene lanolin alcohol, polyoxyethylene lanolin alcohol, polyoxyethylene alkylamine, polyoxyethylene fatty acid amide, polyoxyethylene alkylphenyl formaldehyde condensate, etc. .

Examples of the anionic surfactant include alkylated sulfonates of higher fatty acid amides, alkylallyl sulfonates, and the like. Specifically, alkyl sulfates, polyoxyethylene alkyl ether sulfates, N-
Acyl amino acid salts, N-acyl methyl taurine salts, polyoxyethylene alkyl ether acetates, alkyl phosphates, polyoxyethylene alkyl ether phosphates and the like can be mentioned.

As the water-soluble polymer, polyacrylic acid,
There are acrylic acid copolymers, maleic acid resins, and the like. Specifically, a resin such as an acrylic resin, a styrene-acrylic resin, or a styrene-maleic acid resin made in a salt form to be water-soluble is used. As the alkali metal forming a salt,
Sodium and potassium are typical, and as amines, aliphatic primary compounds such as mono-, di- or tri-methylamine
Typical examples are tertiary amines, alcohol amines such as tertiary amines, mono-di- or tri-propanolamines, methylethanolamine, methylpropanolamine and dimethylethanolamine, and ammonia, morpholine and N-methylpholine. The content of the dispersant is 0.1 in the total composition.
10 to 10% by weight.

The water used in the composition of the present invention is not particularly limited, but is preferably 40 to 90% by weight. If it is less than 40%, it is difficult to volatilize because the amount of the compatibilizing solvent and the colorant is large, and the ink is hard to dry when writing on paper, and if it exceeds 90%, the ink is easily volatilized and the pen tip is dried. It is not preferable because it causes poor writing.

In addition to the above, the ink composition of the present invention may optionally contain a lubricant, emulsion, preservative, rust preventive, and pH.
A regulator, an anti-drying agent, and a thickener can be contained.

Examples of the lubricant include fatty acid salts such as potassium linoleate, sodium ricinoleate, potassium oleate and sodium oleate.

By adding an emulsion, handwriting without bleeding can be obtained, and a comfortable writing feeling can be given. Emulsion content is 1 in the total composition
-15% by weight is preferred. Specific examples include polystyrene, polymethylmethacrylate, polyvinyl chloride, polyvinyl acetate, benzoguanamine resin, and epoxy resin. Furthermore, α, β-ethylenically unsaturated acids (for example,
Acrylic acid, methacrylic acid, maleic acid, etc.), acrylic acid esters and methacrylic acid esters (eg, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate) , And those obtained by copolymerizing vinyl aromatic compounds (eg, styrene and vinyltoluene).

As rust inhibitors, tolyltriazole, benzotriazole and its derivatives, fatty acid phosphorus derivatives such as octyl phosphate, dioctyl thiophosphate, imidazole, benzimidazole and its derivatives, benzimidazole, 2-mercaptobenzothiazole, octyloxymethanephosphone. Examples thereof include acids, dicyclohexylammonium nitrite, diisopropylammonium nitrite, propargyl alcohol, and dialkylthiourea.

As the pH adjusting agent, examples of the inorganic alkali include sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate, sodium hydrogen carbonate,
There are ammonia and the like. Examples of organic amines include methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, propylamine, dipropyl, tripropylamine, butylamine, dibutylamine, tributylamine, isobutylamine, diisobutylamine, 2- Butanamine, N
-(1-methylpropyl) -1-propanamine, N,
N-dimethylbutylamine, 1,2-dimethylpropylamine, N-ethyl-1,2-dimethylpropylamine, allylamine, diallylamine, triallylamine, N, N-dimethylallylamine, N-methyldiallylamine, 3-pentylamine, N , N-diisopropylethylamine, 2- (hydroxymethylamino) ethanol, 2-aminopropanol, 3-aminopropanol, triethanolamine, monoethanolamine,
Diethanolamine, 2-amino-2-methyl-1-propanol, N-isobutyldiethanolamine, 3-
Methoxypropylamine, 3-propyloxypropylamine, 3-isopropyloxypropylamine, 3-
Examples include butoxypropylamine.

Examples of the anti-drying agent include urea, thiourea, ethylene urea and their derivatives.

As the thickener, gum arabic, tragacanth gum, locust bean gum, guar gum and its derivatives, alginic acid, alginate, pectin, carrageenan, gelatin, casein, sodium caseinate,
Xanthan gum, rhamzan gum, welan gum, gellan gum, dextran, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, sodium starch glycolate, lanolin derivative, chitosan derivative, lactalbumin, polyethylene oxide,
Examples thereof include polyethylene glycol, polyvinyl alcohol, polyvinyl methyl ether, polyvinylpyrrolidone and derivatives thereof, polyacrylic acid resins, polyurethane resins, and alkali metal salts of acrylic resins.

The ballpoint pen using the ink of the present invention can obtain a relatively fine handwriting, and unlike a writing instrument having a fiber nib or a resin nib, the nib may be worn out even after a long period of use. Little change in handwriting width. The water-based ink composition of the present invention having an ink viscosity of 1 to several mPa · s is used for a batting type ballpoint pen or a direct storage type ballpoint pen having an ink tank for directly storing ink. The one having 50 to 2000 mPa · s is mainly used as an ink reservoir having a structure using a tube for directly storing ink. The batting type ball-point pen is composed of a barrel containing the batting in which the ink of the present invention is absorbed, a relay core made of a fiber bundle connected to the batting, a pen tip made of a ball and a tip holder, and the like. There are two types of direct-storing type ball-point pens. The ink tank of the present invention directly stores the ink, and the ink pushed out from the ink tank when the air in the ink tank expands due to a temperature rise or the like. A pen composed of an ink reservoir, a ball, a pen tip composed of a tip holder, etc., which temporarily retains the ink in order to prevent it from falling off, and a pen composed of a tube, a ball and a tip holder for directly accumulating the ink of the present invention. Some are made up of destinations and the like. Further, the tip holder used for the water-based ballpoint pen is equipped with a pen tip having at least one material selected from stainless steel, brass and nickel silver and a ball made of cemented carbide, zirconia, silicon carbide or the like.

The aqueous ink composition for a ballpoint pen of the present invention has excellent lubricity when used in a ballpoint pen and improves writing performance. Although its detailed mechanism of action is not clear, 3-amino-5-mercapto-1, which is used in the present invention, is used.
2,4-triazole forms an adsorptive lubricating film on the surface of the ball and the ball seat, which improves the lubricity of the ink and reduces the wear of the ball holder of the tip, resulting in excellent writing feel and smoothness. It has excellent characteristics such as writing quality and drawing lines with less blurring.

[0026]

Next, the present invention will be described in more detail by way of examples, which should not be construed as limiting the present invention. The ink compositions obtained in the respective examples and comparative examples were subjected to the following writing test. The ball sinking measurement method, the writing feeling, and the bleeding state of the handwriting in the written test are as follows. Ball sinking: With a spiral writing tester at a writing angle of 60 degrees, a writing speed of 4.0 m / min and a load of 100 g, the worn depth of the seat of the ball after 500 m, that is, the protruding length of the ball protruding from the holder. The reduced length of was measured. Writing feeling: ○ Smooth and stable writing feel △ Rugged and hard writing taste × Rugged and hard writing taste, and line breaks and directionality. Blurring of handwriting: ○ Clear handwriting without bleeding △ Blurred and unclear writing × Extremely unclear writing with marked bleeding

In each of Examples 1 to 4 and Comparative Examples 1 to 3, a writing test was conducted with an aqueous ballpoint pen of a batting system in which ink is occluded in the batting, and Examples 5 and 4 have an ink tank for storing directly. A direct reservoir type water-based ballpoint pen was used.
In Examples 6 to 7 and Comparative Examples 5 to 6, water-based ballpoint pens filled in polypropylene tubes that directly store ink were used. The ball diameter of the ballpoint pen is 0.5 mm. Examples 1-5, Example 7, Comparative Examples 1-4, Comparative Example 6
The tip used in was a stainless steel tip and the ball was super hard. On the other hand, the chips used in Example 6 and Comparative Example 5 are nickel silver chips, and the balls are superhard balls.

Example 1 The following components were mixed with a stirrer 3 times.
After stirring and mixing for a time, the mixture was dispersed in a sand mill for 5 hours, and coarse particles were removed by a centrifuge to prepare a black aqueous ballpoint pen pigment ink. Carbon Black ["Carbon Black MA-100" manufactured by Mitsubishi Kasei Co., Ltd.] 8.0% by weight Glycerin 20.0 Ammonium salt of styrene acrylic acid resin 3.0 Triethanolamine 0.5 3-Amino-5-mercapto-1,2,4-triazole 0.5 Benzotriazole 0.1 Phenol 0.1 Purified water 67.8 Total 100.0

Example 2 In the same manner as in Example 1, a blue water-based ballpoint pen pigment ink having the following component composition was prepared. Phthalocyanine blue (manufactured by Dainichiseika Co., Ltd.) 7.0% by weight glycerin 25.0 Ammonium salt of styrene maleic acid resin 3.0 Triethanolamine 0.3 Potassium oleate 0.3 3-Amino-5-mercapto-1,2,4-triazole 0.1 Trilyltriazole 0.1 Phenol 0.1 Purified water 64.1 Total 100.0

Example 3 In the same manner as in Example 1, a black aqueous ballpoint pen pigment ink having the following composition was prepared. Carbon black ["Carbon black MA-100" manufactured by Mitsubishi Kasei Co., Ltd.] 8.0% by weight Glycerin 20.0 Ammonium salt of styrene acrylic acid resin 3.0 Triethanolamine 0.5 3-Amino-5-mercapto-1,2,4-triazole 1.0 Benzotriazole 0.1 Phenol 0.1 Styrene-acrylic acid copolymer emulsion 3.0 Purified water 64.3 Total 100.0

Example 4 A black aqueous ballpoint pen pigment ink having the following composition was prepared in the same manner as in Example 1. Carbon black ["Carbon black MA-100" manufactured by Mitsubishi Kasei Co., Ltd.] 8.0% by weight Glycerin 10.0 Ammonium salt of styrene acrylic acid resin 3.0 Aminomethyl propanol 0.3 3-Amino-5-mercapto-1,2,4-triazole 0.3 1,2-Benzisothiazolin-3-one 0.1 Purified water 78.3 Total 100.0

Example 5 The following components were added at 40 to 60 ° C.
After stirring for 1 hour at room temperature, the mixture was cooled and further filtered to prepare a black aqueous ballpoint pen dye ink. C. I. Direct Black # 19 5.0 wt% Ethylene glycol 15.0 3-Amino-5-mercapto-1,2,4-triazole 2.0 Triethanolamine 0.8 2-Pyridinethiol-1-oxide sodium salt 0.1 Benzotriazole 0.2 Purified water
76.9 Total 100.0

Example 6 A red aqueous ballpoint pen dye ink was prepared in the same manner as in Example 5 except that the following components were used at room temperature. C. I. Azed Red 87 5.0 wt% Ethylene glycol 15.0 Triethanolamine 0.3 3-Amino-5-mercapto-1,2,4-triazole 0.3 1,2-Benzisothiazolin-3-one 0.1 Xanthan gum 0.3 Purified water 79.0 Total 100.0

(Example 7) Of the following components, each component except Na polyacrylate was stirred and mixed with a stirrer for 3 hours and dispersed with a sand mill for 5 hours, and coarse particles were removed with a centrifuge. After that, polyacrylic acid was slowly added with stirring at room temperature, and the mixture was further stirred for 3 to 4 hours and then filtered to prepare a black aqueous ballpoint pen pigment ink. Carbon black ["Carbon black MA-100" manufactured by Mitsubishi Kasei Co., Ltd.] 8.0% by weight Glycerin 10.0 Ammonium salt of styrene acrylic acid resin 3.0 3-Amino-5-mercapto-1,2,4-triazole 0.3 Aminomethyl propanol 0.3 1,2-Benzisothiazolin-3-one 0.1 Polyacrylic acid 0.5 Purified water 77.8 Total 100.0

Comparative Example 1 Purified water was added to 6 parts without using 3-amino-5-mercapto-1,2,4-triazole.
Prepared in the same manner as in Example 1 except that the content was changed to 8.3%,
A black aqueous pigment ink was obtained.

Comparative Example 2 Purified water was added to 6 parts without using 3-amino-5-mercapto-1,2,4-triazole.
Prepared in the same manner as in Example 2 except that the content was 4.0%,
A blue aqueous pigment ink was obtained.

(Comparative Example 3) 3-amino-5-mercapto-1,2,4-triazole was not used, but instead the amount of potassium oleate added was 1% and the purified water was 67.3%.
A black aqueous pigment ink was obtained in the same manner as in Example 1 except that the above was used.

Comparative Example 4 Purified water was added to 7% without using 3-amino-5-mercapto-1,2,4-triazole.
Prepared in the same manner as in Example 5 except that the content was changed to 9.2%,
A black aqueous pigment ink was obtained.

(Comparative Example 5) Purified water was added to 7% without using 3-amino-5-mercapto-1,2,4-triazole.
Prepared in the same manner as in Example 6 except that 9.1% was used,
A red aqueous pigment ink was obtained.

(Comparative Example 6) Purified water was added to 7% without using 3-amino-5-mercapto-1,2,4-triazole.
Prepared in the same manner as in Example 7 except that the concentration was changed to 7.9%,
A black aqueous pigment ink was obtained.

Table 1 shows the results of examining the ball sinking, the writing feeling, and the bleeding state of the handwriting in the writing test with the ballpoint pens using the inks obtained in Examples 1 to 7 and Comparative Examples 1 to 6.

[0042]

[Table 1] As described above, the water-based ink composition of the present invention has less ball sinking, has a smooth writing feel, and is less likely to cause handwriting bleeding.

[0043]

INDUSTRIAL APPLICABILITY When used in a ball-point pen, the water-based ink composition for a ball-point pen of the present invention has good lubricity, prevents the wear of the ball holder of the chip, gives a smooth writing feeling, and has a bleeding line with less bleeding. It has excellent properties such as

Claims (3)

[Claims] 1. 3-amino-5-mercapto-1,2,
An aqueous ink composition for a ballpoint pen, which comprises 4-triazole, a colorant and water. 2. 3-amino-5-mercapto-1,2,4-triazole is added in an amount of 0.01 to 10 based on the total amount of the composition.
The water-based ink composition for a ball-point pen according to claim 1, which is contained in a weight percentage. 3. 3-Amino-5-based on the total composition
The aqueous solution according to claim 1, which comprises 0.01 to 10% by weight of the total composition of mercapto-1,2,4-triazole, 0.05 to 30% by weight of a colorant, and 40 to 90% by weight of water. Composition for ballpoint pen.