JPH11310743A - Oil-base ball-point pen ink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an ink which difficultly adheres to the inside wall of a (translucent) transparent ink holder and is capable of the recognition of the volume of the remaining ink by incorporating a colorant, a solvent, a fatty acid amide wax, and an oil incompatible with the fatty acid amide wax in a specified ratio. SOLUTION: This ink comprises, desirably, 5-50 wt.%, based on the total amount of the ink, colorant (e.g. dye and/or pigment); desirably, 10-90 wt.%, based thereon, solvent (e.g. ethylene glycol monophenyl ether or benzyl alcohol); desirably, 0.1-5 wt.%, thereon, fatty acid amide wax; and, desirably 0.5-10 wt.%, based thereon, oil incompatible with the fatty acid amide wax, desirably, a silicone oil with side chains modified with an aliphatic hydrocarbon, more desirably, alkyl-modified silicone oil represented by the formula (wherein R1 to R3 are each Cx H2x+1 ; and x, m, and n are each an integer of 1 or greater).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent or translucent ball-point pen having an ink-receiving portion or a ball-point pen which has an ink-conveying state which is visible from the outside. The present invention relates to an oil-based ballpoint pen ink containing a coloring agent, a solvent, and a fatty acid amide wax, which is improved.

[0002]

2. Description of the Related Art Conventionally, handwriting density is high, writing quality is good,
A coloring agent that can minimize ink leakage and blurring of handwriting,
Regarding inks containing a solvent and a fatty acid amide wax, see JP-A-7-196972, "Oil-based ink composition for ballpoint pens", or JP-A-7-26826.
No. 8, "ink composition for oil-based ballpoint pen" is disclosed and known.

By the way, when an oil-based ink for a ballpoint pen containing a colorant, a solvent and a fatty acid amide wax is stored in a transparent or translucent ballpoint pen refill ink storage portion or a ballpoint pen barrel, writing is performed. It can be seen that the ink adheres to the ink storage portion and the inner wall surface of the barrel, and the visible property (hereinafter, simply referred to as “visible property”), which is the see-through property of the ink consumption state from the outside, is impaired. ing.

As means for solving the above-mentioned problem, means for providing a lubricant layer on the ink storage portion of the ballpoint pen refill or the inner wall surface of the barrel of the ballpoint pen has been well known. However, the above solution requires a step of providing a lubricant layer on the ink container of the ball-point pen refill or the inner wall surface of the barrel of the ball-point pen. There is a problem that it leads to improvement and it is difficult to adopt it for low-priced products.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an oil-based ink for a ballpoint pen containing a colorant, a solvent, and a fatty acid amide wax, wherein the ink is a transparent or translucent ballpoint pen refill, or a ballpoint pen. An object of the present invention is to obtain an oil-based ink for a ball-point pen in which the ink does not easily adhere to the ink storage portion or the inner wall surface of the shaft cylinder so that the remaining amount of the ink can be reliably read even when the ink is stored in the shaft cylinder.

[0006]

According to the present invention, there is provided an oil-based ink for a ballpoint pen containing a colorant, a solvent and a fatty acid amide wax. 0.5 to 10%.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The oil, which is not compatible with the fatty acid amide wax, is added to the composition of other oil-based ballpoint pen inks such as a coloring agent, a solvent, a fatty acid amide wax and a resin in an amount of 0.5 to 10% based on the total amount of the ink. After addition and mixing, the mixture is heated and stirred. For example, when a dye is used as a colorant, the dye and resin are dissolved to obtain an oil-based ink for a ballpoint pen.

As the colorant, an oil-soluble dye or pigment used in a conventional oil-based ink composition for a ballpoint pen can be used. Dyes and pigments may be used in combination. The mixing ratio is preferably 5 to 50% by weight based on the total amount of the ink.

As the solvent, a general solvent can be used and is not particularly specified. The mixing ratio is
It is preferably from 10 to 90% by weight based on the total amount of the ink.

As fatty acid amide wax, fatty acid monoamide, fatty acid bisamide and derivatives thereof can be used, and these may be used in combination. The mixing ratio is preferably 0.1 to 5% by weight based on the total amount of the ink.

Examples of oils incompatible with the fatty acid amide wax include silicone oils whose side chains are modified with aliphatic hydrocarbons and fluorine-modified silicone oils. Specific examples of the former silicone oil include trade names: XF3905, TSF483, and XF4 manufactured by Toshiba Silicon Corporation.
0.A0153, XF40.A1987, etc., and in particular, an alkyl-modified silicone oil represented by the following formula is preferred from the viewpoint of the visibility of the ink container or the barrel.
Specific examples of the alkyl-modified silicone oil include TSF4420 manufactured by Toshiba Silicon Co., Ltd., and KF413 and KF968 manufactured by Shin-Etsu Chemical Co., Ltd.
A specific example of the latter fluorine-modified silicone oil is FL100 or the like manufactured by Shin-Etsu Chemical Co., Ltd.

[0012]

(Equation 2)

(R1, R2 and R3 are alkyl groups represented by the following formulas, where R1 = CxH2x + 1, R2 = CyH2y
+1, R3 = CzH2z + 1, x, y, z, m, n ≧
It is an integer of 1. )

The present invention provides an oil-based ballpoint pen ink containing a colorant, a solvent and a fatty acid amide wax.
In order to make it difficult for the ink to adhere to the inner wall surface of the ink container or the shaft cylinder so that the remaining amount of the ink can be reliably read even when the ink is stored in the ink container of the ballpoint pen feel or the barrel of the ballpoint pen. Add an oil that is not compatible with the fatty acid amide wax. The reason is that the oil is not compatible with the fatty acid amide wax, so the separation due to the difference in specific gravity between the ink and the oil during long-term storage is prevented by adding the fatty acid amide wax to prevent the ink physical properties having a yield value from becoming uniform. Sweating effects occur.
Therefore, oil is deposited on the surface of the ink, and the oil that has perspired there exists between the ink and the ink container of the ballpoint pen refill or the inner wall surface of the barrel of the ballpoint pen. It plays a role and provides visibility. If the oil is compatible with the fatty acid amide wax, the above-mentioned sweating action cannot be obtained, and the oil does not exist between the ink container of the ballpoint pen refill or the inner wall surface of the barrel of the ballpoint pen.

The mixing ratio of the fatty acid amide wax is as follows:
The amount is preferably 0.1 to 5% by weight with respect to the total amount of the ink. The reason is that when the oil is added in an amount of 10% or more, the sweating action becomes too strong, and the ink is stored in the ink container of the ballpoint pen refill or the barrel of the ballpoint pen. If the ball-point pen tip is accommodated in the ball-point pen and turned upward or downward, the oil will remain in the ball-point pen tip, causing problems such as poor writing. If the amount is less than 0.5%, even if a sweating action occurs, the amount of the sweated oil is too small to be present between the ink and the ink container of the ballpoint pen refill or a part of the inner wall surface of the barrel of the ballpoint pen. This is because the ink adheres to the other inner wall surface only by doing so, and the overall visibility is not improved.

[0016]

An embodiment of the present invention will be described. Example 1 A dye as a coloring agent, a solvent, a fatty acid amide wax and a resin, and an alkyl-modified silicone oil as an oil incompatible with the fatty acid amide wax were mixed at the ratio shown below, and then heated and stirred at 50 ° C. The dye and resin were dissolved to obtain a black oil-based ballpoint pen ink. Spiron Black GMH-Special (Dye, Hodogaya Chemical Industry Co., Ltd.) 15% by weight Bali Fast Red V1701 (Dye, Orient Chemical Industry Co., Ltd.) 15% by weight Ketone resin (Hitachi Chemical Co., Ltd., Hirac 111) 14% by weight Polyvinylpyrrolidone resin (PVP K-120, manufactured by ISP Corporation) 0.5% by weight Ethylene glycol monophenyl ether 31.1% by weight Benzyl alcohol 20.6% by weight Oleic acid 2.0% by weight Fatty acid amide wax ( Kyoeisha Chemical Co., Ltd., Flownon SH-290) 1.0% by weight Alkyl-modified silicone oil (Shin-Etsu Chemical Co., Ltd., KF968) 0.8% by weight

Examples 2 to 4 Example 1 was repeated except that the formulation of the ink was as shown in Table 1.
In the same manner as in the above, a black oil-based ballpoint pen ink was obtained. Note) In Example 2, alkyl-modified silicone oil, trade name: TSF4420, manufactured by Toshiba Silicon Co., Ltd., was used as the oil incompatible with the fatty acid amide wax. In Example 3, FL100, a fluorine-modified silicone oil, manufactured by Shin-Etsu Chemical Co., Ltd., was used as the oil incompatible with the fatty acid amide wax. In Example 4, a pigment of carbon black MA-100 manufactured by Mitsubishi Kasei Kogyo Co., Ltd. was used as a coloring agent.

Comparative Examples 1 to 3 Example 1 was repeated except that the composition of the ink was as shown in Table 1.
In the same manner as in the above, a black oil-based ballpoint pen ink was obtained. Note) In Comparative Example 1, KF354 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) that is compatible with fatty acid amide wax instead of oil that is not compatible with fatty acid amide wax.
Was used. In Comparative Example 2, an oil incompatible with the fatty acid amide wax was not added. In Comparative Example 3, 15% by weight of an oil incompatible with the fatty acid amide wax was added.

[0019]

[Table 1]

Test and Evaluation Each of the above inks was accommodated in a transparent ink accommodating portion of a ballpoint pen refill having a ballpoint pen tip into which a ball having a diameter of 0.7 mm was inserted, and the ballpoint pen refill was inserted into a transparent shaft cylinder. The ballpoint pen was formed by wearing the ballpoint pen, and the following performance tests were performed and evaluated.

Writing performance: room temperature 20 ° C. and relative humidity 6
Under an environment of 5%, the ball-point pen was allowed to stand upside down for 30 days so that the ball-point pen tip was directed upward, and the running test machine (manufactured in-house) set the pen pressure to 200 g and the running speed. Under a condition of 1 m / min, a circular writing test was performed for 100 m or more, and the handwriting state was visually observed. In the handwriting state from the beginning to the end of writing, there is no streaking or line fading. What was there ...

Visibility: After the writing performance test, the visibility of the ink remaining amount from outside the barrel of the ballpoint pen was visually observed. Ink remaining in the ink storage area of the ballpoint pen refill was confirmed without ink adhesion. ○ Ink remained in the ink storage area of the ballpoint pen refill and ink remaining was not confirmed.・ ・ ×

The evaluation results of the respective examples and comparative examples are as shown in Table 1.

In Comparative Example 1, the oil that was compatible with the fatty acid amide wax was used instead of the oil that was not compatible with the fatty acid amide wax. Has adhered to the inner wall surface.

In Comparative Example 2, an oil incompatible with the fatty acid amide wax was not added, and the ink adhered to the inner wall surface of the ink container of the ballpoint pen refill.

In Comparative Example 3, the amount of the oil incompatible with the fatty acid amide wax was too large, the sweating action was too strong, and the oil remained in the ballpoint pen tip of the ballpoint pen refill, resulting in poor writing performance. It has happened.

[0027]

According to the present invention, an oil which is incompatible with a fatty acid amide wax is added to an oil-based ink for a ballpoint pen containing a colorant, a solvent and a fatty acid amide wax. Even when the ink is stored in the shaft cylinder, the ink hardly adheres to the ink storage portion or the inner wall surface of the shaft cylinder, and the remaining ink amount can be reliably read.

Claims (4)

[Claims] 1. An oil-based ink for a ballpoint pen containing a coloring agent, a solvent and a fatty acid amide wax, wherein 0.5 to 10% by weight of an oil incompatible with the fatty acid amide wax is added to the total amount of the ink. Oil-based ink for ballpoint pens. 2. The oil-based ballpoint pen ink according to claim 1, wherein the oil incompatible with the fatty acid amide wax is a silicone oil whose side chain is modified with an aliphatic hydrocarbon. 3. The oil-based ballpoint pen ink according to claim 2, wherein the silicone oil whose side chain is modified with an aliphatic hydrocarbon is an alkyl-modified silicone oil represented by the following formula. (Equation 1) (R1, R2 and R3 are alkyl groups represented by the following formula:
R1 = CxH2x + 1, R2 = CyH2y + 1, R3 =
CzH2z + 1, where x, y, z, m, and n ≧ 1. ) 4. The oil-based ballpoint pen ink according to claim 1, wherein the oil incompatible with the fatty acid amide wax is a silicone oil modified with a fluorine compound.