JPH05331403A - Oil-based ball point ink - Google Patents

Abstract

PURPOSE:To provide an oil-based ball point ink improved in writing touch, excellent in wear resistance and lubricity, comprising a dye, resin, organic solvent and alkyl beta-D-glycoside. CONSTITUTION:The ink comprising (A) pref. 10-40 pts.wt. of a dye such as oil-soluble one, (B) pref. 5-40 pts.wt. of a resin such as butyral resin, (C) pref. 20-90 pts.wt. of an organic solvent such as glycol ether, and (D) pref. 0.01-5 pts.wt. of an alkyl beta-glycoside such as 10-15C, n-decyl beta-glycoside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-based ballpoint pen ink, and more particularly to an ink for providing an oil-based ballpoint pen having a good writing quality.

[0002]

2. Description of the Related Art Writing characteristics are extremely important for the usability of oil-based ballpoint pens. Conventionally, the socket portion of the pen tip of an oil-based ballpoint pen has been made of brass or nickel silver. The nib tip made of these materials was able to obtain a smooth writing feel because the smoothness of the material itself was also helped. Therefore, in the case of oil-based ballpoint pens using these nibs, no special device was required for the ink in order to improve the writing quality.

Recently, there is an increasing tendency to use stainless steel as a pen tip material for oil-based ballpoint pens, and this tendency is a reflection of user preferences. In other words, in addition to its beautiful appearance, it is made of stainless steel, so there is no risk of rust and it has a long life as a product. Generally, it has a bullet-shaped pen tip shape, so there is a sense of security that it will not be deformed by external force.
In addition, the reliability of the performance of the stainless steel chip, such as low wear and no risk of balls falling, is backed up. On the other hand, in manufacturing, due to the difficult cutting property of stainless steel, the cutting surface was likely to be uneven, the rotation of the ball was lacking in smoothness, and it was easy to become an oil-based ballpoint pen with poor writing quality.

[0004]

In order to produce an oil-based ballpoint pen using a stainless steel tip, a device for improving the writing quality is particularly required. In terms of tip cutting, a smooth finish of the inner surface of the ball rotation (ball house) is achieved. It has become a problem to be solved especially to improve the lubricity of the ink.

As a result of intensive studies to improve the writing quality of such a stainless nib tip, the present invention is made of stainless steel having a hard writing quality by suitably adding alkyl β-D-glucoside to the ink. The inventors have found that the oil-based ballpoint pen with a tip can be smoothly written and improved in taste.

[0006]

The gist of the present invention is to provide a dye,
It is an oil-based ink for a ballpoint pen, which comprises a fat, an organic solvent, and an alkyl β-D-glucoside. That is, in the present invention, an oily ballpoint pen ink having a smooth writing taste is obtained by suitably adding an alkyl β-D-glucoside to a conventionally known oily ballpoint pen ink consisting of a dye, a resin and an organic solvent. , The usability of oil-based ballpoint pens with stainless steel nibs can be greatly improved, and the purpose can be achieved.

As the dye, resin and solvent used in the oil-based ballpoint pen ink of the present invention, conventionally known materials may be preferably used. If these are shown as examples, the dye may be either an alcohol-soluble dye or an oil-soluble dye. As the resin, a polymer or oligomer such as butyral resin, polyvinylpyrrolidone resin, ketone resin, amino resin, celluloses, rosin, hydrogenated rosin, and abietic acid resin can be used. As a solvent,
In addition to benzylalcol and glycol ether, select a sparingly soluble resin such as N-methyl-2-pyrrolidone, dioxane, and isophorone, and a relatively less toxic one that can suitably dissolve alkyl β-D-glucoside. Can be used.

Many alkyl β-D-glucosides are known, but those having 10 to 15 carbon atoms are particularly suitable for the purpose of the present invention, and examples thereof include the following. n-decyl β-D-glucoside (C ₁₀ ), n-undecyl-D-glucoside (C ₁₁ ), n-dodecyl β-D-glucoside (C ₁₂ ), n-tridecyl β-D-glycoside (C
₁₃ ) n-pentadecyl β-D-glucoside (C ₁₅ ).
And so on. These have a softening point of 70-80 ° C,
It has a pour point of 100 to 130 ° C. Also, since these can be easily chemically bonded to the surface of polysaccharides such as starch, paper, cotton, rayon, and wood, paper sizing agents,
It is said to be used as a modifier for cotton. In order to obtain an oil-based ballpoint pen ink having a good writing quality, one or two or more of these alkyl β-D-glucosides are selected and blended.

The amounts of various materials used in the present invention are shown below. That is, the amount of dye is 10 to 10% of the total amount of ink.
40 parts by weight, resin is 5 to 40 parts by weight, solvent is 20 to 9
0 parts by weight, alkyl β-D-glucoside is 0.01-
It is preferably blended in the range of 5 parts by weight. Furthermore, the present invention may be used in combination with other additives, rust preventives, surfactants, etc., if necessary.

In producing the oil-based ballpoint pen ink of the present invention, 5 equipped with a reflux condenser, a stirrer, and a thermometer was used.
In a three-necked flask having a capacity of 00 ml, a predetermined amount of a solvent and a resin were mixed, and the mixture was sufficiently dissolved at 60 to 70 ° C. for about 1 hour,
After confirming that the resin is uniformly melted, a predetermined amount of the post-dye is added and further dissolved by stirring at 60 ° C. or lower. It takes 3-4 hours to dissolve the dye. After confirming that they are sufficiently dissolved, an appropriate amount of alkyl β-D-glucoside is added, and the mixture is sufficiently stirred to achieve uniform dissolution, and this is filtered to obtain an oil-based ballpoint pen ink of the present invention. I can.

[0011]

EXAMPLES The present invention will now be specifically described with reference to examples. Example 1 Benzyl alcohol 30 parts by weight N-methyl-2-pyrrolidone 5 Isophorone 5 Butyl carbitol 20 Ketone resin 10 Nigrosine dye (oil-soluble dye) 25 n-Decyl β-D-glucoside (C ₁₀ ) 5 These are preferably used. By mixing, a black oil-based ballpoint pen ink was obtained. This was used as the core of an oil-based ballpoint pen with a stainless steel nib tip.

Comparative Example 1 benzyl alcohol 30 parts by weight N-methyl-2-pyrrolidone 5 isophorone 5 butyl carbitol 25 ketone resin 10 nigrosine dye (oil-soluble dye) 25 n-decyl β-D-glucoside (C)
₁₀ ) was not added, and 5 parts of this was replaced with the solvent butyl carbitol to prepare a black ink to prepare an oil-based ballpoint pen core with a stainless steel nib tip.

Example 2 Phenyl glycol 53 parts by weight Butyral resin 5 Rosin 15 Alcohol-soluble dye Astroble base 25 n-Undecyl β-D-glucoside (C ₁₁ ) 1.5 n-Undecyl β-D-glucoside (C ₁₃ ) 0.5 These were appropriately mixed to obtain a blue oil-based ballpoint pen ink. Using this, an oil-based ballpoint pen core with a stainless steel nib tip was obtained.

Example 3 Benzyl alcohol 20 parts by weight Phenyl glycol 38.98 Ketone resin 14 Alcohol-dissolving dye Varifast Red 25 n-Pentadecyl β-D-glucoside (C ₁₅ ) 0.02 Amine surfactant 2 These are suitable. To give a red oil-based ballpoint pen ink. Using this, an oil-based ballpoint pen core with a stainless steel nib tip was obtained.

Writing test of oil-based ballpoint pen with stainless steel nib tip There are subtle problems in writing test of oil-based ballpoint pen.
Since there is no uniform test method, samples were distributed to the monitors and the usability was totaled. The monitor consisted of 10 people who received special training, and the prototype core was tested with the number hidden and evaluated by the 5-point method.

[0016]

[Table 1]

Thus, the ink examples 1 and 2 of the present invention
It was determined that each of Nos. 3 and 4 had a score of 4 or more, and that the writing feeling was good with a human sense. Since the writing quality is said to have an influence on the viscosity, the viscosity is also described in each Example for reference.

[0018]

As described above, by appropriately blending the alkyl .beta.-D-glucoside with the oil-based ballpoint pen ink, it is possible to obtain a good writing feel even with an oil-based ballpoint pen having a stainless steel nib tip. As a result, it is possible to manufacture an oil-based ballpoint pen that maximizes the original characteristics of the stainless steel nib tip, which is less worn and can maintain the feeling of writing at the beginning until the end.

Claims (2)

[Claims] 1. A dye, resin, organic solvent and alkyl β
-An oil-based ball-point pen ink comprising D-glucoside. 2. The oil-based ballpoint pen ink according to claim 1, wherein the alkyl β-D-glucoside has an alkyl group having 10 to 15 carbon atoms.