JPH07216284A - Water-based ball point pen ink composition - Google Patents

Abstract

PURPOSE:To obtain a water-based ball point pen ink composition free from blotting of written line even in the case of an ink having low viscosity, exhibiting excellent lubrication effect and ensuring stable delivery of ink. CONSTITUTION:This water-based ball point pen ink is composed mainly of a cross-linked acrylic acid polymer, a styrene-maleic acid copolymer resin, a pigment, water and a water-soluble organic solvent and further contains 0.2-30wt.% of reducing maltose syrup containing maltitol as a main component.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an aqueous ballpoint pen ink composition using a pigment as a coloring material.

[0002]

2. Description of the Related Art Conventionally, water-based ballpoint inks have used water-soluble dyes as colorants.
Pigments have been used to improve light resistance. However, a water-based ballpoint pen ink using a pigment has a drawback that it has poor lubricity. In order to solve this, for example, a water-based pigment ink using a wax emulsion (JP-A-63-8465), a water-based ink using a water-soluble amine salt or sodium salt of a carboxylic acid (JP-A-64-606).
72) etc., various lubricants are used, but since problems such as large blurring of writing lines and aggregation of pigments occur, add only an amount sufficient to obtain a sufficient lubricating effect. It is not possible to do so, the seat wear is large, and the writing distance is short.

[0003]

Since the water-based ballpoint pen ink has a low viscosity, the ball bearing inside the metal tip of the pen tip wears little by little with writing, so that continuous writing or strong writing pressure is applied. If you write with, you will eventually start to get scratched, and at the end you will be unable to write even though there is ink in the ink filling pipe.
In addition, even if scratches and writing are not possible, the ink outflow at the beginning of writing and the ink outflow at the middle part and even the last part of the ink are significantly different, resulting in uneven density of the writing line. It has the drawback of becoming

Water-based inks using pigments, which have been used in recent years, also have the drawback of poor lubricity, and attempts have been made to improve them by using various lubricants, but bleeding of writing lines becomes large, Since the problem of pigment agglomeration occurs, it is not possible to add an amount sufficient to obtain a sufficient lubricating effect, the wear of the ball seat is large, and the short writing distance cannot be solved. It has reached today.

[0005]

As a result of various studies to solve the above-mentioned problems, the present invention provides a cross-linked acrylic acid polymer,
An aqueous ball-point pen ink containing styrene-maleic acid copolymer resin, pigment, water, and a water-soluble organic solvent as main components, and containing reduced maltose starch syrup containing maltitol as the main component in an amount of 0.2 to 30% by weight. Is characterized by.

[0006]

That is, the present invention relates to an aqueous ball-point pen ink using a pigment as a colorant, and as other main components, a cross-linking acrylic acid polymer, a styrene-maleic acid copolymer resin,
It is characterized in that water and a water-soluble organic solvent are used, and reduced maltose syrup containing maltitol as a main component is used as a lubricant. By using a reduced maltose starch syrup containing maltitol as a main component, there is no bleeding of writing lines despite the low viscosity ink, the lubricating effect is excellent, and a stable ink outflow amount is obtained. Become.

The reduced maltose syrup containing maltitol (the structural formula is shown below) as a main component used in the present invention is
It is acid-stable and has the effect of keeping water in the ink more stable, so it has an excellent effect on decapping property.

[0008]

[Chemical 1]

Although it is not theoretically known why reduced maltose syrup is effective as a lubricant, the preferred range of use in which the lubricating effect is obtained is 0.2 to 30 in all ink components.
% By weight. When it was 0.2% by weight or less, the lubricating effect was not recognized so much, the writing line was bleeding, and the writing distance remained short. When it is 30% by weight or more, the viscosity of the ink increases and the ball rotation of the pen tip tends to be hindered. As the reduced maltose syrup, there is a trade name Mabit (produced by Hayashibara Co., Ltd.).

The components other than the reduced maltose starch syrup containing maltitol as the main component of the present invention are well known and generally used as an aqueous ballpoint pen ink composition. That is, a cross-linked acrylic acid polymer is known to make an aqueous solution having an extremely large yield value, and the trade name is Junron PW.
110 and 111 (all manufactured by Nippon Pure Chemical Co., Ltd.) and trade names Hibiswako 103, 104 and 105 (all manufactured by Wako Pure Chemical Industries, Ltd.). The styrene-maleic acid copolymer resin is used as a dispersion stabilizer for pigments and is often used together with styrene acrylic resin and acrylic methacrylic acid resin. As the pigment, carbon black, titanium oxide, ultramarine blue, dark blue, inorganic pigments such as Benji,
Carmine 6B, C.I. I. Pigment Red 112, C.I.
I. Pigment Blue 15, C.I. I. Pigment Green 7 and other organic pigments, and fluorescent pigments obtained by emulsion-polymerizing an acrylic styrene copolymer resin with a dye, an emulsifier, an activator and the like can also be used. Examples of the water-soluble organic solvent include glycerin, ethylene glycol, diethylene glycol, propylene glycol and polyethylene glycol.

In addition to the above main components, surfactants, rust preventives, preservatives, which are generally used as water-based ballpoint pen inks,
Examples of surfactants that can be used by adding a pH adjusting agent, a viscosity adjusting agent, a wetting agent and the like include polyethylene glycol alkyl ether, polyethylene glycol alkyl phenyl ether, polyethylene glycol polypropylene glycol ether, perfluoroalkyl carboxylate, and perfluoroalkyl carboxylate. Nonionic surfactants such as fluoroalkyl phosphate ester and polyether modified silicone oil can be exemplified. Examples of the rust preventive agent include benzotriazole, tolyltriazole, dicyclohexylammonium nitrate and the like. Examples of antiseptics include sodium benzoate, potassium sorbate, sodium pentachlorophenol, and the like. Examples of the pH adjusting agent include sodium hydroxide, sodium carbonate, triethanolamine, N-methyldiethanolamine, diisopropanolamine, monoethanolamine, triethylamine and the like. Examples of the viscosity modifier include carboxymethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, polyvinylpyrrolidone, dextrin and the like. Urea or the like can be used as the wetting agent.

[0012]

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

[0013]

[Table 1]

In each of Examples 1 to 3 and Comparative Examples 1 and 2, water, ethylene glycol and glycerin were weighed, and then Hibiswako was weighed and added with vigorous stirring to completely dissolve them. Next, while continuing vigorous stirring, the styrene-maleic acid copolymer resin, carbon black, and reduced maltose starch syrup mavit are added, and further urea, benzotriazole, and potassium sorbate are added. Finally, triethanolamine was added until the PH value reached 7 to 8 with a PH meter, and then vigorous stirring was continued until a uniform aqueous ballpoint pen ink was obtained. In Example 1, 1.0% of reduced maltose syrup was added. In Example 2, 5.0% of reduced maltose syrup was added. In Example 3, 10.0% of reduced maltose syrup was added. In Comparative Example 1, 0.1% reduced maltose syrup was added. In Comparative Example 2, no reduced maltose syrup was added.

The ink viscosity and PH value of Examples 1 to 3 and Comparative Examples 1 and 2 are shown below. After filling the transparent pipes made of polyethylene having a diameter of 3.0 mm with the inks of Examples 1 to 3 and Comparative Examples 1 to 2 with a height of about 10 cm and an ink weight of about 0.75 g, and mounting a metal tip for a water-based ballpoint pen, A streak test was carried out at room temperature based on JIS S-6053.

The results of the ink outflow amount and the writing distance per 100 meters in the streak test are shown in the table. The value of * () is the outflow amount until the last ink consumption of the writing, for example, the ink outflow amount from 700 to 704 m is 5.4 mg in Example 1, and the ink outflow amount from 600 to 680 m is in Example 2. It shows that it is 95.0 mg. -Result of State of Writing Line- The writing lines of Examples 1 to 3 were drawn with uniform density without bleeding. In the writing lines of Comparative Examples 1 and 2, bleeding became visible after 100 m and the lines became thick.

[0017]

The aqueous ball-point pen ink composition of the present invention comprises a cross-linking acrylic acid polymer, a styrene / maleic acid copolymer resin, a pigment, water, and a water-soluble organic solvent as main components,
Reduced maltose syrup containing maltitol as the main ingredient is 0.2 ~
By containing 30% by weight, the metal tip for water-based ballpoint pens has an excellent lubricating effect, wear of the ball seat inside the metal tip is reduced, a stable ink outflow is obtained, and the ink density becomes uniform. It is an excellent thing that the distance becomes long.

Claims (1)

[Claims] 1. A reduced maltose starch syrup containing maltitol as a main component in an aqueous ball-point pen ink containing a cross-linking acrylic acid polymer, a styrene-maleic acid copolymer resin, a pigment, water, and a water-soluble organic solvent as main components. Water-based ballpoint pen ink composition, characterized by containing 0.2 to 30% by weight.