JPS59131678A - Ball-point pen using erasable ink - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ballpoint pen using erasable ink, and more specifically, a rubber component, a low boiling point solvent,
This invention relates to a ballpoint pen in which an ink containing tube is filled with erasable ink made of a pigment and a high boiling point solvent, and this erasable ink is pressurized by special means so that it can be supplied to a ball portion.

Conventionally, ballpoint pens are known that use ink that allows handwriting written on paper to be easily erased with an eraser within a certain period of time.

However, the ink contained in these types of ballpoint pens usually consists of a rubber component, a low-boiling point solvent, a pigment, and a high-boiling point solvent, and generally has relatively good performance in terms of erasability. However, there are problems with paper marks on the box or after writing, and the flow of ink in the ink storage tube.Also, there are problems with the paper surface of the ink due to the high viscosity, which is a characteristic of ink with such a composition, and the pigment used. In many cases, the pressurizing action of the ink supply reservoir to the ball part cannot be effective due to a decrease in the adhesion force to the ball.
It was difficult to ensure stable writing performance during writing.

The inventors of the present invention have conducted various researches in order to obtain a ballpoint pen that uses erasable ink and has sufficient writing stability during writing, and have completely improved the performance of the ink itself and improved the flow of ink supply to the ball part of the ballpoint pen. The present invention was completed by improving the pressurizing effect so that it exerts a sufficient effect.

Therefore, according to the present invention, the properties of the ink itself contained in a ballpoint pen are improved by specifying the usage amount of each component of erasable ink and the ratio of each component to each other, and the ink is removed from the ink storage part. An effective pressurizing effect is obtained by providing special vertical grooves in the capillary pores that guide the ball, and in this way, the appropriate amount of erasable ink can always stay in the i-ru part, providing excellent writing stability. A ballpoint pen having the following properties is obtained.

The present invention will be described in more detail below with reference to the drawings. I will clarify. As shown in FIG. 1, a ballpoint pen 1 that uses erasable ink 1 is comprised of an ink storage tube 2, a barrel tube and a sheath tube 4 into which the tube is fitted. The ink storage tube 2 has an ink storage part 5 and a ball part 6 where ink should always stay,
An ink guide hole 7 and a capillary hole 8 for guiding the ink 1 to the ball portion 6 are provided between the ink storage portion 5 and the ball portion 6. 9 is a vertical hole bored in the inner wall surface of the capillary hole 8,
The vertical grooves 9 are connected to the ink grooves 10a formed radially on the ball seat 10 of the ball portion 6 (514!). are doing.

The vertical groove 9 may be formed along the entire length of the inner wall of the capillary hole 8 (see FIGS. 6 and 4) or may be provided in a portion thereof (see FIGS. 5 and 6), but in short, It was installed on the catch seat 10. Any material may be used as long as it communicates with the ink groove 10a.

In addition, if the related structure between the vertical groove 9 and the ink groove 10a is properly determined and well maintained, the vertical groove 9 will communicate with all of the ink 6410a in the examples shown in FIGS. 6 and 4. are doing. In addition, in [ㅅ] shown in Fig. 5 and Fig. 6, the vertical groove 9
It has a structure that communicates with a part of the ink+'41#10a. As mentioned above, the related structure between the vertical groove 9 of the capillary hole 8 and the ink groove 10a may be any structure as long as the two communicate with each other, but the ink 1 by the pressurizing means described later From the viewpoint of expecting a more effective pressurizing action, it is preferable to have a structure in which the vertical groove 9 extending over the entire length of the capillary hole 8 communicates with the entire ink groove 10a (Fig. 6,
(See Figure 4).

In the figure, reference numeral 11 denotes a ball, which is positioned above the ball seat 10 and rotatably held within the ball holding section 12. P is a pressurized air chamber in which pressurized nitrogen a is sealed by appropriate means. Reference numeral 16 is a tail plug for preventing leakage of the air gust a, and is tightly fitted from the rear end of the ink storage tube 2. Further, reference numeral 5 denotes a follower stopper, which moves while contacting the surface of the ink 10 as the amount of ink decreases, thereby preventing direct contact between the sudden air a and the ink 1.

Next, the ink used in the ballpoint pen of the present invention will be explained.

Ink 1 has the property of being able to temporarily erase lead marks left behind by vinegar, and contains a rubber component, a rubber solvent, and a pigment as main components. The rubber component may be natural rubber or synthetic F・y rubber, and the amount used is 1% relative to the other components.
It is specified in the 6-22 weight class. In the present invention, the amount of rubber component is slightly lower than that of the conventional one, but this is because, on the one hand, it ensures the erasability of the pattern, and on the other hand, the ink itself has a lower adhesion force than the ink's adhesion to the paper. The self-cohesiveness of the ink increases and the ink on the paper surface adheres to the ink on the ball instead of being transferred to the paper during writing, resulting in the inability to change continuous handwriting. This is to avoid it. Next, as the rubber solvent, we use a low boiling point rubber solvent and a high boiling point rubber solvent, but the low boiling point rubber solvent evaporates from the paper surface before the rubber component penetrates into the paper surface, increasing the viscosity of the ink. It has the effect of rapidly increasing the ink to prevent the ink from penetrating into the S fibers on the paper surface and making it possible to erase it with an eraser for a while. A solvent is used.

This low boiling point rubber solvent is an important entity in relation to rubber, and as its ratio (weight ratio, the same applies hereinafter) to the rubber component increases, the fluidity of the ink will remain on the paper for a long time after writing, so the ink However, if the ratio to the rubber component decreases, the rubber component will not be sufficiently dissolved and the uniformity of the ink composition in the ink storage tube will be lost. It turns out. Therefore, the ratio of the low boiling point rubber solvent to the rubber component is preferably 1.6 to 1.8.

High boiling point rubber solvents include mineral oil with a boiling point of approximately 600°C or higher, DOP
, DOA, etc., and the ratio to the pigment is important.

In other words, as the ratio to pigment increased, erasability worsened. When the ratio is decreased, the pigment paste (mixture of pigment, high-boiling rubber solvent, and lubricant) is mixed with the rubber solution (rubber component is masticated and dissolved in a low-boiling rubber solvent). The ink composition becomes unsatisfactory and the uniformity of the ink composition is lost. Therefore, the ratio of high boiling point solvent to pigment is preferably 1.5 to 1.8.

The pigment is an inorganic pigment such as carin black or graphite, or an organic pigment such as an azo pigment or a phthalocyanine pigment, and its ratio to the rubber component is important. If the ratio to the rubber component is increased, erasability will be adversely affected, and if the ratio is decreased, the ink composition containing an excess of the rubber component will scatter in the form of strings from the ball portion. Therefore, the optimum ratio of pigment to rubber component is 0.8 to 1.1.

The ink used in the ballpoint pen of the present invention has the above-mentioned components as its main components, but in addition to these, a lubricant such as a fatty acid or metal soap may be used to improve the adhesion of the ink to the lubricant. ing.

However, in producing the erasable ink of the present invention, the rubber component is first masticated with a masticating roll, swelled in a low boiling point rubber solvent, and then heated and dissolved at about 70°C. A homogeneous rubber melt is obtained. Separately, the pigment, high-boiling rubber solvent, and lubricant are kneaded using three rolls to form a pigment paste. The homogeneous rubber solution and pigment paste are placed in a closed kneader and kneaded at 70-80°C to homogenize, and then cooled to form the desired ink composition.

Next, the composition ratio of the ink composition and the mutual ratio of the 11N components will be illustrated.

Example 1 Pigment (Carzen Black) 16 High boiling point rubber bath agent (DOP) 27.2//Lubricant (
oleic acid) 4.07/ direction 2 Synthetic rubber of 98 cis-14-polyinprene 1e
,,q Egg charge by weight (Carzen black) 1
5.0 //〃 (Victoria Blue Lake)
2.0 1/Low boiling point rubber bath agent (in-paraffinic saturated hydrocarbon) 29
．． 5 1/High boiling point rubber solvent (DOA) 3
0,6p lubricant (oleic acid)4. Ott According to the present invention, as described above, not only the blending ratio of each component of the ink composition but also the mutual ratio of each component is specified to a predetermined ratio to improve the performance of the ink itself.
Since the capillary hole that guides the ink in the zeal part where the ink should always stay has a vertical groove that communicates with the ink groove in the pole seat, it improves the ink performance and significantly improves the followability of the ink. He succeeded in improving Kokichi. In other words, as mentioned above, this type of ink has a high viscosity and poor adhesion to paper, so the effect of capillary action cannot be expected much, and it is made to flow to the ball part by pressure action by various means. In Although,
According to the present invention, under such conditions, the existence of the vertical groove of the capillary hole communicating with the ink groove of the pole catch improves the capillary force of the ink guiding reservoir and makes it possible to expect good pressurizing action of the moving vehicle. As a result, a ballpoint pen using erasable ink with a high 11 performance can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted side sectional view for explaining the ball pen according to the present invention, Fig. 2 is an explanatory view showing the relationship between the ball part and the ink storage part, and Figs. Fig. 4 is an explanatory diagram of the communication structure between the vertical groove of the capillary hole and the ink groove of the pole receiver, and the third factor is an explanatory diagram when the capillary hole communicates with the entire ink groove over the entire length. FIG. 6 is a plan view of FIG. 6, and FIG. 5 is an explanatory diagram of a case where a vertical groove bored over a part of the capillary hole communicates with a part of the ink groove; FIG. 6 is a plan view of FIG. It is a diagram. DESCRIPTION OF SYMBOLS 1... Zeel pen, 2... Ink storage tube, 5... Ink storage section, 6... Seel portion, 7... Ink guide Hole, 8... Capillary hole, 9... Longitudinal groove, 10... Ze (6 others)

Claims (1)

[Claims] A ballpoint pen in which an ink storage tube is filled with erasable ink consisting of a rubber component, a low-boiling point rubber solvent, a pigment, and a high-boiling point rubber solvent, and the ink is supplied to the ball part under pressure. Total amount of ink 16~
22% by weight, the weight ratio of the low boiling point rubber solvent to the rubber component is 1.6 to 1.8, and the weight ratio of the pigment to the rubber component is 0.
．． 8 to 1.1, the weight ratio of the high boiling point rubber solvent to the pigment is 1.5 to 1.8, and a vertical groove is bored on the inner wall surface of the capillary hole provided between the Zeal receiver and the ink storage part. and make the vertical groove N
- A ballpoint pen using erasable ink, which is characterized by communicating with an ink groove provided in the ball catch.