JPH09268270A - Aqueous ink composition for ball point pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition containing a specific coloring agent, a water-soluble resin, a water-soluble organic solvent and water as main components, having a desired beautiful pearl-like or metallic luster without using a metal powder pigment, and excellent in time stability. SOLUTION: This aqueous ink composition contains (A) a coloring agent containing 0.001-2.0wt.% of a dyestuff (e. g. a direct dyestuff, a basic dyestuff of an acidic dyestuff) of carbon black and 3-30wt.% of a pearl-lustrous pigment, (B) a water-soluble resin such as a water-soluble acrylic resin, a crosslinked acrylic acid resin or a carboxymethylcellulose, (C) a water-soluble organic solvent such as ethylene glycol, propylene glycol or glycerol, and (D) water as main components.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an aqueous ballpoint pen ink composition having a beautiful pearly or metallic luster.

[0002]

2. Description of the Related Art Water-based ballpoint pens are lighter in writing feel than oil-based ballpoint pens, have a high writing line density, and have no fluffing. As
Consumer demand has diversified, and there are demands for not only conventionally used colors such as black, red, and blue, but also for multiple colors such as yellow, pink, and orange, as well as bright fluorescent colors and metallic colors. It was The metallic color water-based ink contains a metallic aluminum pigment, a water-soluble organic solvent, and water containing a perfluoroalkyl phosphate ester (Japanese Patent Laid-Open No. 6-1.
92610) is known.

However, when a powdered metal pigment such as a metallic aluminum pigment is used as a colorant, it is easily corroded and its stability with time is inferior and satisfactory performance cannot be obtained, and the desired color is extremely limited. Therefore, it cannot meet the demands of consumers.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides an aqueous ball-point pen ink having a beautiful pearl-like or metallic luster, without using a pigment in which a powder of metal is used, or a beautiful pearl-like ink having a desired taste. It has a metallic luster,
An object of the present invention is to provide an ink having excellent stability over time.

[0005]

In order to obtain a water-based ballpoint pen ink having a beautiful pearly or metallic luster, the present invention has been variously studied, and as a result, 3 to 30% by weight of a pearlescent pigment and 0 as a colorant have been obtained. By including 0.001 to 2.0% by weight of dye and / or carbon black,
The inventors have found that the object can be achieved and completed the present invention.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION That is, the present invention relates to an aqueous ball-point pen ink composition containing a colorant, a water-soluble resin, a water-soluble organic solvent, and water as main components, and the colorant is 3 to 30.
By containing 1% by weight of pearlescent pigment and 0.001 to 2.0% by weight of dye and / or carbon black, it has a desired pearly or metallic luster color and is stable over time. The water-based ink composition has excellent properties.

The pearlescent pigment used in the present invention is
Mineral mica is made into a fine powder, and its surface is stabilized by coating it with a high-refractive-index metal oxide such as titanium oxide and iron oxide. Light reflected at the low-rate mica and the boundary with the surrounding medium produces a pearly or metallic luster. The dye and / or carbon black are used to obtain a desired color tone. By using a pearlescent pigment as a colorant in combination with a dye and / or carbon black that has a desired color tone, it is possible to freely select a wide variety of color tones that cannot be obtained with inks that use metal powders. Further, the aqueous ink composition is excellent in stability over time, because it gradually reacts with acid or alkali to generate a gas, and is not affected by oxygen dissolved in water as a main component. The use ratio of the pearlescent pigment is preferably in the range of 3 to 30% by weight, and when it is 3% by weight or less, a pearly or metallic luster is obtained, but when writing lines are used, only a slight gloss is obtained. If it is 30% by weight or more, it becomes difficult to disperse it uniformly although it depends on the water-soluble resin, water-soluble organic solvent and dispersant used. The most preferred range of pearlescent pigment is 5 to
It was 20% by weight. Specific examples of pearlescent pigments include Iriodin 100, 103, 111, 1
20, 123, 151, 153, 163, 1
73, same 201, same 211, same 221, same 223, same 2
31, 205, 215, 217, 219, 2
25, 235, 249, 259, 289, 2
99, Timiron MP-115, the same MP-100
1, the same MP-47, the same MP-1005, the same MP-10,
Same MP-45SP, Extender W (all above,
MERCK) and the like.

The dye and / or carbon black is used to give a desired color tone, but the ratio of its use is 0.
It may be 001 to 2.0% by weight. If it is 0.001% by weight or less, the color tone density is insufficient in the case of a writing line. If it is 2.0% by weight or more, the color tone density becomes excessive, and it becomes difficult to obtain a pearly or metallic luster depending on the usage ratio of the pearlescent pigment. Specific examples of dyes include C.I. I.
Direct Yellow 44, C.I. I. Direc
t Yellow50, C.I. I. Direct Red
84, C.I. I. Direct Red 225, C.I. I.
Direct Violet 9, C.I. I. Direct
Blue2, C.I. I. Direct Green30
Direct dyes such as C.I. I. Basic Yellow2
5, C.I. I. Basic Orange2, C.I. I. Ba
sic Red 9, C.I. I. Basic Violet
3, C.I. I. Basic Blue1, C.I. I. Bas
basic dyes such as ic Blue9, C.I. I. Acid
Yellow1, C.I. I. Acid Yellow
7, C.I. I. Acid Orange 7, C.I. I. Ac
id Red1, C.I. I. Acid Red 13, C.I.
I. Acid Red 94, C.I. I. Acid Vio
let7, C.I. I. Acid Blue 7, C.I. I. A
cidBlue9, C.I. I. Acid Blue 74,
C. I. Acid Blue 90, C.I. I. Acid
Green7, C.I. I. Acid Green16,
C. I. Acid dyes such as Acid Brown 39 are mentioned. Carbon black has a silver color when used in combination with a pearlescent pigment, and a desired beautiful pearl-like or metallic state when used in combination with a pearlescent pigment in combination with each of the above dyes alone or in a mixture. It is possible to obtain a glossy color tone.

The water-soluble resin usable in the present invention includes:
Water-soluble acrylic resin, which is generally used as an aqueous ball-point pen ink but is used as a viscosity modifier, cross-linking type acrylic acid resin, carboxymethyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone, methyl cellulose, glyoxal-added methyl cellulose, carboxy cellulose, hydroxymethyl cellulose, ethyl cellulose. , Hydroxyethyl cellulose, hydroxypropyl cellulose, sodium alginate, copolymers of vinyl acetate and polyvinylpyrrolidone, synthetic products such as poly N-vinylacetamide, tragacanth gum, guar gum,
Examples include natural gums such as xanthan gum and carrageenan. These water-soluble resins may be used alone or in combination of two or more.

The water-soluble organic solvent is used for the purpose of preventing ink drying at the metal tip portion of the ballpoint pen tip, preventing ink freezing at low temperature, and lubricating effect for smoothing ball rotation.
It is possible to use one kind or a mixture of two or more kinds of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, polyethylene glycol, glycerin and the like which are generally used as an aqueous ball-point pen ink.

Needless to say, in addition to the above main components, generally used surfactants, dispersants, rust preventives, additives for improving writing feel, etc. can be used. As the surfactant, sorbitan fatty acid ester, glycerin fatty acid ester, polyoxyethylene fatty acid ester,
Nonionic surfactants such as polyethylene glycol fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, anions such as alkyl sulfates, polyoxyethylene alkyl ether sulfates, alkyl phosphates and alkyl sulfocarboxylates. Examples include system surfactants. Examples of the dispersant include acrylic / styrene copolymers, maleic acid / styrene copolymers, and neutralized salts thereof. Examples of the rust preventive agent include benzotriazole, tolyltriazole, dicyclohexylammonium nitrate and the like. Examples of the additive that improves the writing feel include alkali metal soaps of fatty acids, such as potassium oleate, sodium oleate, calcium stearate, and lithium stearate.

[0012]

The present invention will be described in detail with reference to examples.

[0013]

[Table 1]

In each of Examples 1 to 5, after weighing each compositional component, dissolution and dispersion were carried out at room temperature while stirring, and at a measurement temperature of 25 ° C., Tokimec EHD viscometer, rp
An aqueous ink composition for a ballpoint pen having a viscosity of 200 to 2500 at m20.0 was obtained.

Next, a comparative example will be shown.

[0016]

[Table 2]

Comparative Example 1 is a composition in which the pearlescent pigment of the composition of Example 1 is changed from 7% by weight to 2% by weight, and the amount of weight loss is increased by water. Comparative Example 2 is a composition in which the proportion of dye in the composition of Example 2 is reduced to an extremely small amount and the amount of water is increased accordingly.
Comparative Example 3 is a composition in which the amount of carbon black used in the composition of Example 3 is increased and the amount of water is reduced accordingly. Comparative Example 4
From 15% by weight of the pearlescent pigment of the composition of Example 4 to 4
The composition was increased to 0% by weight and the amount of water was reduced accordingly.

Comparative Examples 1 to 4 were measured under the same conditions using the same viscometer as in Examples to obtain aqueous ink compositions for a ballpoint pen having a viscosity range of 200 to 2500 cp.

Next, Table 3 shows the test results of pearl / metal luster, stability over time, and writing line density of the inks of Examples and Comparative Examples.

[0020]

[Table 3]

[0021]

As described in detail above, in a water-based ballpoint pen ink composition containing a colorant, a water-soluble resin, a water-soluble organic solvent, and water as main components, 3 to 3 parts are added as the colorant.
30% by weight of pearlescent pigment and 0.001-2.0% by weight
The ink composition for water-based ballpoint pens, which contains the dye and / or carbon black described above, has a beautiful pearly or metallic luster and is an ink excellent in stability over time.

Claims (1)

[Claims] 1. A colorant, a water-soluble resin, a water-soluble organic solvent,
And an aqueous ball-point pen ink composition containing water as a main component, containing 3 to 30% by weight of a pearlescent pigment and 0.001 to 2.0% by weight of a dye and / or carbon black as the colorant. A characteristic aqueous ink composition for a ballpoint pen.