JPH0565447A - Oil-based ink composition for ball-point pen - Google Patents

Abstract

PURPOSE:To provide the subject composition containing a colorant, an organic solvent, a resin and a carboxylated polyoxyethylene alkyl ether, smoothly deliverable at the start of writing, giving comfortable write-starting feeling and smooth stroke in writing and having excellent writing performance. CONSTITUTION:The objective composition contains at least (A) preferably 20-70wt.% of a colorant, (B) preferably 20-70wt.% of an organic solvent (e.g. benzyl alcohol and Cellosolve), (C) a resin soluble in the organic solvent (e.g. ketone resin and sulfonamide resin) and (D) a carboxylated polyoxyethylene alkyl ether of formula [(n) is 1-20; R is 1-30C alkyl; M is H, metal (e.g. Na or K), ammonium or alkanolamine].

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an ink composition for oil-based ballpoint pens.

[0002]

As a conventional ink composition for oil-based ballpoint pens, in order to increase the dissolution stability of a basic dye used as a coloring material, to smoothly start the writing of ink for writing, and to obtain a smooth writing feeling, There is an ink composition containing oleic acid. However, since this oleic acid has a property of being adsorbed on the metal surface, it may be adsorbed on the surface of the ball to significantly reduce the frictional resistance between the ball and the writing surface. Therefore, a phenomenon occurs in which the ball slips on the writing surface, the ball does not rotate, and the ink is not transferred to the writing surface. Most of this phenomenon occurs at a distance of about 0.1 mm to 3 mm in a drawn line, and is generally referred to as “white spot”, “line break”, “dot roller”, etc. The phenomenon is referred to as "white spot".) In rare cases, the symptoms are so severe that writing becomes impossible. In addition, oleic acid has a drawback that it is highly corrosive to metals and that the various performances of the ballpoint pen are greatly deteriorated with time.

[0003]

SUMMARY OF THE INVENTION Therefore, according to the present invention, the writing out of ink is smooth and the feeling of first writing is good, and the feeling of smooth writing is obtained, and the writing feeling is good, and the ball and the writing surface are good. It is an object of the present invention to provide an oil-based ink composition for a ballpoint pen, which has a moderate friction with and can prevent the occurrence of white spots, and can also prevent the deterioration of the ballpoint pen over time.

[0004]

In order to achieve the above object, the ink composition for an oil-based ballpoint pen of the present invention comprises a colorant, an organic solvent, a resin soluble in the organic solvent, and
Of at least a carboxylated polyoxyethylene alkyl ether represented by the general formula:

[Chemical 2] (In the formula, n represents an integer of 1 to 20, R represents an alkyl group having 1 to 30 carbon atoms, M represents a hydrogen atom, a metal atom such as Na or K, ammonium or an alkanolamine.)

The amount of the carboxylated polyoxyethylene alkyl ether used in the present invention is preferably 0.1 to 20.0 parts by weight based on the total amount of the composition. This amount is 0.
If it is less than 1 part by weight, the effect of the present invention cannot be obtained, and if it exceeds 20 parts by weight, other qualities such as hue density as an ink composition for oil-based ballpoint pens and sticking property of ink to paper may be impaired. .

Although the carboxylated polyoxyethylene alkyl ether can obtain a sufficient effect even when it is used as a substitute for oleic acid, its effect is not impaired even when it is used in combination with a fatty acid such as oleic acid, and further, the corrosive action of these fatty acids. Is significantly effective in improving the storage stability of the ballpoint pen.

As the colorant used in the present invention, all known dyes and / or pigments used in conventional inks for ballpoint pens can be used. When these colorants are used, they can be used alone or in combination as needed. The blending amount thereof is preferably in the range of 20 to 70 parts by weight based on the total weight of the ink.

As the organic solvent used in the present invention, a solvent which is used in a usual ink composition for oil-based ballpoint pens, that is, a solvent which dissolves or disperses the above-mentioned coloring material and has a relatively high boiling point can be used. Examples of such substances include benzyl alcohol, phenoxyethanol, carbitols and cellosolves. These may be used alone or in combination of two or more, and the blending amount thereof is preferably in the range of 20 to 70 parts by weight based on the total amount of the composition.

The resin used in the present invention is for preparing an ink composition with high viscosity, and is a resin which is commonly used in ordinary ink compositions for oil-based ballpoint pens, such as ketone resin, sulfamide resin, malein resin, Ester gum, xylene resin, alkyd resin, phenol resin, rosin resin, polyvinylpyrrolidone, etc. are used. You may use these resins individually or in mixture of 2 or more types. Further, the blending amount thereof is preferably in the range of 5 to 30 parts by weight based on the total amount of the ink composition.

[0010]

[Function] Keeps the ball of the oil-based ballpoint pen rotating smoothly,
In order to obtain a stable writing line that does not cause "white spots", it is necessary to appropriately maintain the frictional resistance between the ball and the writing surface and to prevent the ink from solidifying at the ball peripheral portion of the chip. The oil-based ballpoint pen ink to which the carboxylated polyoxyethylene alkyl ether of the present invention is added, the carboxylated polyoxyethylene alkyl ether does not adhere to the ball surface closely like oleic acid or a similar fatty acid, so that the ball and the writing surface are The friction resistance with and is kept moderate, the ball does not slip on the writing surface, and smooth rotation is obtained. Furthermore, since the ink of the present invention reduces the coefficient of friction with the ball seat, the ballpoint pen using the ink to which these are added can obtain a smooth writing feel. The carboxylated polyoxyethylene alkyl ether is an acid weaker than oleic acid or a similar fatty acid, has a small metal corrosiveness, and is excellent in storage stability as an ink for a ballpoint pen.

[0011]

EXAMPLES The inks of the examples of the present invention and the inks of the comparative examples were prepared with the compositions shown below. In addition, the compound A, the compound B, and the compound C in the examples are one of the carboxylated polyoxyethylene alkyl ethers used in the present invention, and have the structures represented by the following chemical formulas 3, 4, and 5, respectively. Is to have.

[0012]

[Chemical 3]

[Chemical 4]

[Chemical 5]

In the examples and comparative examples, the coloring material A is Nigrosine EX (registered trademark of Orient Chemical Co., Ltd.), and the coloring material B is Varifast Yellow # 1105.
(Manufactured by Orient Chemical Co., Ltd., registered trademark name), Colorant C is Spiron Violet CRH (registered trademark by Hodogaya Chemical Co., Ltd.), Colorant D is Varifast Black # 1805
(Orient Chemical, registered trademark name), Colorant E is methyl violet base (Hodogaya Chemical, registered trademark name),
Ketone resin is Hirac # 111 (Hitachi Chemical Co., Ltd. registered trademark), polyvinylpyrrolidone is PVP K-90 (G
AF) was used.

Example 1 Colorant A 20 (parts by weight) Colorant B 5 Colorant C 15 Benzyl alcohol 5 Phenoxyethanol 40 Compound A 10 Ketone resin 15 Polyvinylpyrrolidone 0.1

Example 2 Colorant D 20 (parts by weight) Colorant B 5 Colorant E 15 Benzyl alcohol 10 Phenoxyethanol 40 Compound B 5 Ketone resin 15 Polyvinylpyrrolidone 0.1 Oleic acid 3

Example 3 Colorant D 20 (parts by weight) Colorant B 5 Colorant C 15 Benzene alcohol 10 Phenoxyethanol 40 Compound C 0.1 Ketone resin 15 Polyvinylpyrrolidone 0.4

Comparative Example 1 Colorant A 20 (parts by weight) Colorant B 5 Colorant C 15 Benzyl alcohol 5 Phenoxyethanol 40 Oleic acid 10 Ketone resin 15 Polyvinylpyrrolidone 0.1

Comparative Example 2 Colorant D 20 (parts by weight) Colorant B 5 Colorant E 15 Benzyl alcohol 10 Phenoxyethanol 40 Ketone resin 15 Polyvinylpyrrolidone 0.1 Oleic acid 8

Comparative Example 3 Colorant D 20 (parts by weight) Colorant B 5 Colorant C 15 Benzyl alcohol 10 Phenoxyethanol 40 Oleic acid 0.1 Ketone resin 15 Polyvinylpyrrolidone 0.4

For each of the above-mentioned Examples and Comparative Examples, "blurring test at the time of writing" and "forced deterioration test" were carried out,
Moreover, the occurrence of "white spots" was observed on the line drawn in the "blurring test when writing". The ball-point pen used had a polypropylene tube and a phosphor bronze tip (the ball was cemented carbide tungsten carbide, diameter 0.7 mm), and the contents of each test are as follows.

"Discoloration test at the time of writing" After discarding,
After standing at room temperature for 24 hours, a straight line was drawn at a load of 100 g and a writing speed of 4.5 m / min, and the length of the blur was measured. "Forced deterioration test" The sample was left in a constant temperature and humidity tank at 50 ° C and 80% RH for a predetermined time, allowed to cool to room temperature, and spirally written by hand to check the writability.

As a result of the above-mentioned test, the ink of the example of the present invention had an extremely short and good blur length of 2 mm or less at the time of writing, and no "white spot" phenomenon was observed. The forced deterioration test could be written even after 90 days. Next, with the ink of the comparative example, the blur length at the time of writing was about 4 mm, which was about twice that of the example, and "white spots" of 0.1 mm to 3 mm were confirmed in most of the drawn lines. Further, in the forced deterioration test, the writing became impossible after 40 days, and the deterioration with time was much larger than that of the example.

Further, regarding the ball-point pens using the inks of the above-mentioned Examples and Comparative Examples, a blind test of 20 people was conducted and asked about the superiority of writing quality, and 18 people found that the inks of Examples were excellent.

[0024]

The present invention is as described above, and a ballpoint pen using the ink composition for an oil-based ballpoint pen of the present invention is
Stable writing lines without white spots are obtained, the ink is smoothly ejected at the time of writing, a good first impression is obtained, and a smooth writing feeling gives a good writing quality.
Further, there is an effect that deterioration with time is small.

Claims (1)

[Claims] 1. An ink composition for an oil-based ballpoint pen, which contains at least a coloring material, an organic solvent, a resin soluble in the organic solvent, and a carboxylated polyoxyethylene alkyl ether represented by the following general formula. [Chemical 1] (In the formula, n represents an integer of 1 to 20, R represents an alkyl group having 1 to 30 carbon atoms, M represents a hydrogen atom, a metal atom such as Na or K, ammonium or an alkanolamine.)