JPH08302267A - Aqueous ink composition for ball-point pen - Google Patents

Abstract

PURPOSE: To obtain an ink composition slightly blurring, having excellent lubricating properties, slightly wearing a ball seat caused by rotation of a ball, maintaining a proper ink outflow, giving a smooth writing feeling, hardly making a ball-point pen scratchy because of suppression of drying of ink at a pen point when used for a ball-point pen. CONSTITUTION: This aqueous ink composition for a ball-point pen contains at least one alkylene oxide adduct to a polyhydric alcohol selected from the group consisting of an alkylene oxide adduct to a polyglycerol, an alkylene oxide adduct to glycerol obtained by adding 1-150mols of the alkylene oxide and an alkylene oxide adduct to trimethylolpropane, a colorant, a thickening agent and water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based ballpoint pen ink. More specifically, the present invention relates to an ink having excellent lubricity, an effect of reducing wear of a ball seat, excellent durability, and excellent writing feeling.

[0002]

2. Description of the Related Art Conventional water-based ballpoint pens have been used in which ink having a viscosity of 1 to several centipoises is impregnated in an ink occluding body composed of a fiber bundle. The above-described ink occlusion body impregnated with ink has a drawback in that it is difficult to see the remaining amount of ink in appearance. In order to make it possible to know the amount of ink remaining in the water-based ballpoint pen, a method is employed in which the viscosity of the ink is increased and the ink is stored in a transparent container, and the ink itself is held in the ink storage tube of the ballpoint pen. This ink uses a dye or pigment ink as a colorant, and in addition to water, a water-soluble solvent such as glycol or glycerin is used as a main component solvent in order to suppress ink drying at the pen tip (non-drying property). There is. However, if it is left as it is, the lubricity is poor, and the friction resistance between the ball and the ball seat increases when the ball rotates during writing. That is, the writability of the ball is remarkably deteriorated, for example, the ball seat is worn and the ball is sunk, the ball is rattled, or the ink flows out unevenly. For the purpose of remedying such drawbacks, attempts have been made to add lubricity improvers such as unsaturated fatty acids and potassium oleate.

[0003]

As described above, according to the above-mentioned conventional method, sufficient lubricity cannot be obtained, and the unreadable phenomenon occurs due to abrasion of the ball seat, and even if sufficient lubricity is not obtained. Even if it is obtained, on the other hand, there is a problem that the surface tension of the ink is remarkably lowered and the handwriting is liable to bleed.
It is an object of the present invention that the surface tension is not extremely lowered, and therefore the handwriting is less likely to bleed and has sufficient lubricity, so that smooth ball rotation reduces wear of the ball seat and remarkably improves writing performance. At the same time, it is intended to provide an ink for water-based ballpoint pens that gives a comfortable writing feel and is excellent in non-drying property.

[0004]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventor has achieved the above-mentioned object by including an alkylene oxide adduct of a specific polyhydric alcohol in an ink composition. The inventors have found what can be achieved and have completed the present invention based on this finding.

The aqueous ink composition for a ballpoint pen of the present invention comprises an alkylene oxide adduct of polyglycerin, an alkylene oxide adduct of glycerin in which 1 to 150 mol of alkylene oxide is added to glycerin, and an alkylene oxide adduct of trimethylolpropane. It is characterized by containing an alkylene oxide adduct of at least one polyhydric alcohol selected from the group, a colorant, a thickener and water.

The first aqueous ink composition for a ball-point pen of the present invention is characterized by containing a colorant, a thickener, water and an alkylene oxide adduct of polyglycerin.
Preferably, an alkylene oxide adduct of polyglycerin having 1 to 60 mol of polyglycerin alkylene oxide having a degree of polymerization of 2 to 4 is added in an amount of 0.5 to 40% by weight of the total composition, and a coloring agent is added in an amount of 0.5 to 40% of the composition. 30% by weight, thickener 0.1 to 5% by weight of the composition and water 40 to 9% of the composition.
It is an aqueous ink composition for a ballpoint pen containing 0% by weight.

The second aqueous ink composition for a ball-point pen of the present invention is characterized by containing a colorant, a thickener, water, and an alkylene oxide adduct of glycerin in which 1 to 150 mol of alkylene oxide is added to glycerin. To do. Preferably, the alkylene oxide adduct of glycerin is 0.5 to 40% by weight of the total composition, the colorant is 0.5 to 30% by weight of the composition, and the thickener is 0.1 to 5% by weight of the composition. And an aqueous ink composition for a ballpoint pen containing 40 to 90% by weight of water.

The third aqueous ink composition for a ball-point pen of the present invention is characterized by containing a colorant, a thickener, water and an alkylene oxide adduct of trimethylolpropane. Preferably, the alkylene oxide adduct of trimethylolpropane in which 1 to 60 mol of alkylene oxide is added to trimethylolpropane is 0.5 to 40% by weight of the total composition, and the colorant is 0.5 to 30% by weight of the composition. , 0.1 to 5% by weight of the composition of thickener and 4% of water
An aqueous ink composition for a ballpoint pen, which contains 0 to 90% by weight.

The alkylene oxide adduct of polyglycerin used in the composition of the present invention is obtained by adding 1 to 60 mol of alkylene oxide to polyglycerin having a polymerization degree of 2 to 4, and examples thereof include diglycerin and triglycerin. Glycerin is a kind of one obtained by adding 1 to 60 mol of ethylene oxide or propylene oxide or a mixture thereof to a polymer of 2 to 4 mol of glycerin. The content of the alkylene oxide adduct of polyglycerin is preferably 0.5 to 40% by weight, and more preferably 1 to 30% by weight of the total composition. If it is less than 0.5% by weight, sufficient lubricity cannot be obtained and improvement in writing performance cannot be expected, and if it exceeds 40% by weight, the viscosity of the ink becomes high and the ink flows out from the pen tip. It becomes worse and unsuitable.

The alkylene oxide adduct of glycerin used in the composition of the present invention is 1 to 150 mol of alkylene oxide added to glycerin, preferably 11 to 60 mol. For example, it is one of those obtained by adding 1 to 150 mol of ethylene oxide, propylene oxide, or a mixture thereof to glycerin. The content of the alkylene oxide adduct of glycerin is preferably 0.
It is 5 to 40% by weight, and more preferably 1 to 30% by weight. If it is less than 0.5% by weight, sufficient lubricity cannot be obtained and improvement in writing performance cannot be expected, and if it exceeds 40% by weight, the viscosity of the ink becomes high and the outflow from the pen tip deteriorates. Not suitable. The alkylene oxide adduct of trimethylolpropane used in the composition of the present invention is trimethylolpropane having 1 to 60 alkylene oxides.
For example, it is one of those obtained by adding 1 to 60 mol of ethylene oxide or propylene oxide, or a mixture thereof to trimethylolpropane. The content of the alkylene oxide adduct of trimethylolpropane is preferably 0.5 to 40% by weight of the total composition, more preferably 1 to 30% by weight.
Is. If it is less than 0.5% by weight, sufficient lubricity cannot be obtained, and improvement in writability cannot be expected.
If it exceeds the range, the viscosity of the ink becomes high and the outflow of the ink from the pen tip deteriorates, which is not suitable.

A water-soluble organic solvent may be used in the ink composition of the present invention. Examples of the solvent include water-soluble polyhydric alcohols such as ethylene glycol, propylene glycol, and glycerin, cellosolves such as ethylene glycol monomethyl ether (methyl cellsolve), ethylene glycol monoethyl ether (ethyl cellosolve), and diethylene glycol monomethyl ether ( Carbitols such as methyl carbitol) and diethylene glycol monoethyl ether (ethyl carbitol),
Examples thereof include glycol ether esters such as ethylene glycol monoethyl ether acetate.
These have the effect of improving the non-dry property. Also,
The content is usually 40% by weight or less, preferably 5 to 40% by weight, based on the entire composition. If it exceeds 40% by weight, the ink may strike through when it is written on paper and it may be difficult to dry, which is not preferable.

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 one of inorganic and organic pigments conventionally used in water-based ink compositions can be used. Examples of the inorganic pigment include titanium oxide, carbon black, metal powder, and the like, and examples of the organic pigment include:
For example, azo lake, insoluble azo pigment, chelate azo pigment, phthalocyanine pigment, perylene and perinone pigment,
Canthraquinone pigment, quinacridone pigment, dye lake,
Examples include nitro pigments and nitroso pigments. Specifically, phthalocyanine blue (C.I.74160), phthalocyanine green (C.I.74260), Hansa yellow 3G (C.I. 11670), disazo yellow GR (C.I. 21100), permanent red 4R.
(C.I. 12335), Brilliant Carmine 6B
(C.I. 15850), quinacridone red (C.I.
I. 46500) and the like can be used.

As the water-soluble dye, any of direct dye, acid dye, food dye and basic dye can be used. An example of a direct dye is described below. C. I. Direct Black 17, the same 19, the same 22, the same 32, the same 38, the same 51,
71, C.I. I. Direct Yellow 4, the same 26, the same 4
4, 50, C.I. I. Direct Red 1, same 4, same 2
3, ibid 31, ibid 37, ibid 39, ibid 75, ibid 80, ibid 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, 119, and the like. An example of the acid dye will be described below. C. I. Acid black 1, same 2, same 2
4, the same 26, the same 31, the same 52, the same 107, the same 109, the same 110, the same 119, the same 154, C.I. I. Acid Yellow 7, Same 17, Same 19, Same 23, Same 25, Same 29, Same 3
8, ibid 42, ibid 49, ibid 61, ibid 72, ibid 78, ibid 11
0, 141, 127, 135, 142, C.I.
I. Acid Red 8, the same 9, the same 14, the same 18, the same 2
6, 27, 35, 37, 51, 52, 5
7, ibid 82, ibid 87, ibid 92, ibid 94, ibid 115, ibid 1
29, 131, 138, 186, 249, 2
54, 265, 276, C.I. I. Acid Violet 15, 17, 17, C.I. I. Acid Blue 1, 7
Ibid 9, ibid 15, ibid 22, ibid 23, ibid 25, ibid 40, ibid 4
1, the same 43, the same 62, the same 78, the same 83, the same 90, the same 9
3, 103, 112, 113, 158, C.I.
I. Acid Green 3, 9th, 16th, 25th, 2nd
7 and the like. Most of the food dyes are contained in the direct dyes or the acid dyes. I. Food Yellow 3 can be mentioned. An example of the basic dye will be described below. C. I. Basic Yellow 1, 2, 2, 21, C.I. I. Basic Orange 2, the same 14, the same 32, C.I. I. Basic Red 1, the same 2, the same 9, the same 14, C.I. I. Basic Violet 1, Same 3, Same 7, C.I. I. Basic Green 4, C.I. I. Basic Brown 12, C.I. I. Basic Black 2, 8 and the like.

These colorants may be used alone or in combination of two or more, and their content in the entire composition is usually 0.5 to 30% by weight, preferably 1 to 15%. It is in the range of% by weight. If it is stored for more than 30% by weight for a long period of time, the pigments may agglomerate or the dyes may deposit, causing clogging on the pen tip, causing writing failure. 0.5
If it is less than the above range, the coloring is weakened and the hue when written on paper is not known, which is not preferable. When a pigment is used as the colorant, it is necessary to use a dispersant. This dispersant has a function of adsorbing to the surface of the pigment particles to disperse the pigment in water, and nonionic, anionic surfactant or water-soluble polymer is used. A water-soluble polymer is preferably used.

Examples of nonionic surfactants include polyoxyalkylene higher fatty acid esters, higher fatty acid partial esters of polyhydric alcohols, higher fatty acid esters of sugars, and the like. Specifically, glycerin fatty acid esters, polyglycerin fatty acid esters, Propylene glycol fatty acid ester, pentaerythritol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbit fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyethylene glycol fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene phytosterol, polyoxyethylene Polyoxypropylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene castor oil, Polyoxyethylene lanolin, polyoxyethylene lanolin alcohols, polyoxyethylene alkyl amines, polyoxyethylene fatty acid amides,
Examples include polyoxyethylene alkylphenyl formaldehyde condensates.

Examples of the anionic surfactants include alkyl sulfonates of higher fatty acid amides and alkylallyl sulfonates, and specifically, alkyl sulfates, polyoxyethylene alkyl ether sulfates, N-
Examples include acyl amino acid salts, N-acyl methyl taurine salts, polyoxyethylene alkyl ether acetates, alkyl phosphates, polyoxyethylene alkyl ether phosphates, and the like.

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 acid resin, or a styrene maleic acid resin made into a salt form to be water-soluble is used. The alkali metal forming a salt is typically sodium or potassium, and the amine is an aliphatic primary to tertiary amine such as mono-, di- or tri-methylamine, mono-, di- or tri-amine. Typical examples are alcohol amines such as -propanolamine, methylethanolamine, methylpropanolamine and dimethylethanolamine, as well as ammonia, morpholine and N-methylpholine. The content of the dispersant is 0.1 to 10% by weight in the composition.

As the thickener, natural gum arabic, tragacanth gum, guar gum, locust bean gum,
Alginic acid, carrageenan, gelatin, casein, xanthan gum, dextran, semi-synthetic methyl cellulose, ethyl cellulose, hydroxyethyl cellulose,
Carboxymethyl cellulose, sodium starch glycolate, propylene glycol alginate,
Synthetic polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl methyl ether, sodium polyacrylate, carboxyvinyl polymer, polyethylene oxide, copolymer of vinyl acetate and polyvinylpyrrolidone,
Water-soluble polymers such as alkali metal salts of acrylic resins can be mentioned. The content of the thickener is 0.1 in the composition.
~ 5% 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 the amount is less than 40% by weight, the amount of the relative solvent and the colorant increases, so that it is hard to volatilize, and the ink becomes hard to be dried when writing on paper, and if it exceeds 90% by weight, 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 composition of the present invention may contain a lubricant, a preservative, and a pH adjusting agent, if necessary. Examples of the lubricant include fatty acid salts such as potassium linoleate, sodium ricinoleate, potassium oleate, and sodium oleate, and the surfactants mentioned as the dispersant. As a preservative, phenol, isopropylmethylphenol, sodium pentachlorophenol, benzoic acid, sodium benzoate, dehydroacetic acid, sodium dehydroacetate, sorbic acid, potassium sorbate, 2-pyridine, 5-chloro-2-methyl-4-isothiazoline Amines or bases as pH adjusters such as 3-one, 2,4-thiazolylbenzimidazole, paraoxybenzoate, etc., various organic amines such as triethanolamine, monoethanolamine, diethanolamine, sodium hydroxide, water Examples thereof include inorganic alkali agents of hydroxides of alkali metals such as lithium oxide and potassium hydroxide, and ammonia.

The water-based ink composition of the present invention has excellent lubricity and improves writing performance. Although its detailed mechanism of action is not clear, oxygen of the hydroxyl group and ether bond in the structure of the alkylene oxide adduct of the specific polyhydric alcohol used in the present invention shows an adsorption action on the metal surface, and A carbon hydrogen chain is lined up on the opposite side of. Therefore, it is assumed that the viscosity of the alkylene oxide adduct itself of the specific polyhydric alcohol itself imparts lubricity by forming a lubricating film between the ball and the seat of the ball.

The ballpoint pen of the present invention is of a direct liquid type.
This ballpoint pen is composed of a tube for directly storing the ink of the present invention, a pen tip including a ball and a tip holder, and the like.

[0024]

EXAMPLES The present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto. The inks obtained in the respective examples and comparative examples were evaluated by the following writing test. The results are shown in Table 1.
The ball sinking measurement method, the writing feeling, and the bleeding state of the handwriting in the written test are as follows. Ball sinking: 500 m under the conditions of a writing angle of 60 degrees, a writing speed of 5.5 m / min, and a load of 100 g using a spiral writing tester.
The worn depth of the seat of the ball after writing, that is, the reduced length of the protruding length of the ball protruding from the holder, was measured. Writing feel: ◯: Smooth and stable writing quality Δ: Rugged and hard writing taste ×: Rugged and hard writing feeling, line breaks, and directionality. Bleeding of handwriting: ◯: Handwriting that is clear and has no bleeding Δ: Handwriting that is bleeding and is unclear ×: Handwriting that is extremely unclear and has bleeding

Example 1 A red water-based ballpoint pen dye ink was prepared with the following composition. Each component was obtained by stirring at room temperature for 3 to 4 hours and then filtering. Weight% Dye: Eosin (CI Acid Red 87) 4.0 Solvent: Ethylene glycol 10.0 Diglycerin ethylene oxide 30 mol adduct 5.0 Thickener: Guar gum 4.0 Lubricant: Potassium oleate 0.3 Preservative: sodium benzoate 0.1 Rust inhibitor: benzotriazole 0.1 Purified water: 76.5 Total 100.0

Example 2 A black water-based ballpoint pen pigment ink was prepared with the following composition. Stir each component except sodium polyacrylate for 3 hours with a stirrer.
After mixing, disperse in sand mill for 5 hours, further remove coarse particles by centrifuge, then slowly add sodium polyacrylate while stirring at room temperature, then stir for another 3-4 hours, then filter. I got it. % By weight Pigment: Carbon black ("Carbon black MA100" manufactured by Mitsubishi Kasei Co., Ltd.) 7.0 Solvent: Glycerin 5.0 10% propylene oxide adduct of triglycerin 10.0 Dispersant: Styrene acrylic acid fatty ammonium salt 2 .0 Thickener: sodium polyacrylate 2.0 Lubricant: potassium linoleate 0.2 pH adjuster: triethanolamine 0.5 Preservative: 1,2-benzisothiatholin-3-one (Zeneca Corporation) "Proxel BDN") 0.1 Rust inhibitor: benzotriazole 0.2 Purified water 73.0 Total 100.0

A pink aqueous ballpoint pen ink was prepared with the following formulation. Each component was obtained by stirring at room temperature for 3 to 4 hours and then filtering. Weight% Colorant: NKW-2317 (manufactured by Nippon Fluorescence Co., Ltd.) 50.0 (Synthetic resin latex dyed with fluorescent dye) Solvent: Propylene glycol 10.0 Ethyl oxide of glycerin 10 moles, Fluorene oxide 10 moles Additive 10.0 Thickener: Xanthan gum 4.0 Lubricant: Potassium oleate 0.2 Preservative: Phenol 0.1 Antirust agent: Benzotriazole 0.1 Purified water: 25.6 Total 100.0

Example 4 A black aqueous ballpoint pen dye ink was prepared with the following composition. Each component was obtained by stirring at room temperature for 3 to 4 hours and then filtering. Wt% Dye: C.I. I Direct Black # 19 5.0 Solvent: Ethylene glycol 15.0 Addition of 20 mol of ethylene oxide to glycerin 5.0 Thickener: Guar gum 4.0 Lubricant: Potassium oleate 0.3 Preservative: Sodium benzoate 0 .1 Anticorrosion agent: Benzotriazole 0.1 Purified water: 70.5 Total 100.0

Example 5 A blue water-based ballpoint pen pigment ink was prepared with the following composition. Stir each component except sodium polyacrylate for 3 hours with a stirrer.
After mixing, disperse in sand mill for 5 hours, further remove coarse particles by centrifuge, then slowly add sodium polyacrylate while stirring at room temperature, then stir for another 3-4 hours, then filter. I got it. % By weight Pigment: Phthalocyanine blue ("Chromofine Blue 4965" manufactured by Dainichiseika Co., Ltd.) 8.0 Solvent: Glycerin 5.0 Adduct of glycerin with 10 mol of propylene oxide 10.0 Dispersant: Styrene acrylic acid fatty ammonium salt 2 .0 Thickener: sodium polyacrylate 2.0 Lubricant: potassium linoleate 0.2 pH adjuster: triethanolamine 0.5 Preservative: 1,2-benzisothiatholin-3-one (Zeneca Corporation) "Proxel BDN") 0.1 Rust inhibitor: benzotriazole 0.2 Purified water 72.0 Total 100.0

Example 6 An orange aqueous ballpoint pen ink was prepared with the following composition. Each component was obtained by stirring at room temperature for 3 to 4 hours and then filtering. % By weight Colorant: NKW-2304 (manufactured by Nippon Fluorescent Co., Ltd.) 50.0 (Synthetic resin latex dyed with fluorescent dye) Solvent: Propylene glycol 10.0 Glycerine ethylene oxide 10 moles, propylene oxide 5 moles added Product 10.0 Thickener: Xanthan gum 4.0 Lubricant: Potassium oleate 0.2 Preservative: Phenol 0.1 Antirust agent: Benzotriazole 0.1 Purified water: 25.6 Total 100.0

Example 7 A red aqueous ballpoint pen dye ink was prepared with the following composition. Each component was obtained by stirring at room temperature for 3 to 4 hours and then filtering. % By weight Dye: Eosin (CI Acid Red 87) 4.0 Solvent: Glycerin 10.0 Ethylene oxide 5 mole adduct of trimethylolpropane 15.0 Thickener: Guar gum 4.0 Lubricant: Potassium oleate 0 .3 Preservative: sodium benzoate 0.1 Rust inhibitor: benzotriazole 0.1 Purified water: 66.5 Total 100.0

Example 8 A black aqueous ballpoint pen pigment ink was prepared with the following composition. Stir each component except sodium polyacrylate for 3 hours with a stirrer.
After mixing, disperse in sand mill for 5 hours, further remove coarse particles by centrifuge, then slowly add sodium polyacrylate while stirring at room temperature, then stir for another 3-4 hours, then filter. I got it. % By weight Pigment: Carbon black ("Carbon black MA100" manufactured by Mitsubishi Kasei Co., Ltd.) 7.0 Solvent: Glycerin 5.0 10 mol adduct of trimethylolpropane with propylene glycol oxide 10.0 Dispersant: Styrene acrylic acid fatty ammonium salt 2.0 Thickener: sodium polyacrylate 2.0 Lubricant: potassium linoleate 0.2 pH adjuster: triethanolamine 0.5 Preservative: 1,2-benzisothiatholin-3-one (Zeneca ) "Proxel BDN") 0.1 Antirust agent: Benzotriazole 0.2 Purified water 73.0 Total 100.0

Example 9 A pink aqueous ballpoint pen ink was prepared with the following composition. Each component was obtained by stirring at room temperature for 3 to 4 hours and then filtering. Weight% Colorant: NKW-2317 (Nippon Fluorescent Co., Ltd.) 50.0 (Synthetic resin latex dyed with a fluorescent dye) Solvent: Ethylene glycol 10.0 Trimethylolpropane ethylene oxide 5 mol Propylene oxide 10 mol Additive 10.0 Thickener: Xanthan gum 4.0 Lubricant: Potassium oleate 0.2 Preservative: Phenol 0.1 Antirust agent: Benzotriazole 0.1 Purified water: 25.6 Total 100.0

Comparative Example 1 A red water-based ballpoint pen dye ink was obtained in the same manner as in Example 1 except that 30 mol of an ethylene oxide adduct of diglycerin was not used and ethylene glycol was changed to 15%. (Comparative Example 2) Propylene oxide 1 of triglycerin
A black aqueous ballpoint pen pigment ink was prepared in the same manner as in Example 2 except that 0 mol adduct was not used, glycerin was 15%, potassium linoleate was 0.5%, and water was 72.7%. .

Comparative Example 3 A pink aqueous ballpoint pen ink was prepared in the same manner as in Example 3 except that 10 mol of ethylene oxide and 10 mol of propylene oxide of diglycerin were not used and propylene glycol was changed to 20%. Obtained. (Comparative Example 4) A black aqueous ballpoint pen dye ink was obtained in the same manner as in Example 1 except that 20% of ethylene oxide was not added to glycerin and ethylene glycol was changed to 20%.

(Comparative Example 5) Prepared in the same manner as in Example 2 except that 10 mol of propylene oxide of glycerin was not used, glycerin was 15%, potassium linoleate was 0.5%, and water was 71.7%. Then, a blue water-based ballpoint pen pigment ink was obtained. (Comparative Example 6) An orange water-based ballpoint pen ink was prepared in the same manner as in Example 3 except that 10 mol of ethylene oxide and 5 mol of propylene oxide of glycerin were not used and propylene glycol was changed to 20%.

Comparative Example 7 A red water-based ballpoint pen dye ink was prepared in the same manner as in Example 1 except that 5 mol of ethylene oxide of trimethylolpropane was not used and glycerin was changed to 25%. (Comparative Example 8) Without using a 10 mol adduct of trimethylolpropane with propylene oxide, potassium linoleate containing 15% glycerin was added to 0.5% and water was added to 72.7%.
A black aqueous ball-point pen pigment ink was prepared in the same manner as in Example 2 except that the above was used.

(Comparative Example 9) A pink aqueous ballpoint pen ink was prepared in the same manner as in Example 3 except that 5 mol of ethylene oxide and 10 mol of propylene oxide of trimethylolpropane were not used and ethylene glycol was changed to 20%. Got A polypropylene tube was filled with the inks obtained in Examples 1 to 9 and Comparative Examples 1 to 9 described above, and a water-based ballpoint pen with a pen tip assembled using a ball and a tip holder attached to one end of the tube was assembled. The ball sinks in the test,
Table 1 shows the results of examining the writing feeling and the blurring state of the handwriting.

[0039]

[Table 1]

[0040]

INDUSTRIAL APPLICABILITY The water-based ball-point pen ink composition of the present invention, when used in a ball-point pen, provides good lubricity with less bleeding of handwriting, less wear of the ball seat due to rotation of the ball, and proper ink outflow. Gives a smooth brush feeling. In addition, since the ink is suppressed from being dried by the pen tip, there is an effect that it is difficult to blur.

Claims (3)

[Claims] 1. An alkylene oxide adduct of polyglycerin, wherein glycerin contains 1 to 15 alkylene oxides.
It contains an alkylene oxide adduct of at least one polyhydric alcohol selected from the group consisting of an alkylene oxide adduct of glycerin and an alkylene oxide adduct of trimethylolpropane added with 0 mol, a colorant, a thickener, and water. A water-based ballpoint pen ink composition comprising: 2. The ink composition for a water-based ballpoint pen according to claim 1, wherein the alkylene oxide adduct of the polyhydric alcohol is contained in an amount of 0.5 to 40% by weight of the total composition. 3. The content in the composition is 0.5 to 40% by weight of alkylene oxide adduct of polyhydric alcohol, 0.5 to 30% by weight of colorant, and 0.1 to 5% by weight of thickener. The water-based ink composition for a ballpoint pen according to claim 1, which comprises 40 to 90% by weight of water.