JPH04479B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a liquid writing instrument that uses a relatively high viscosity ink with pigments etc. dispersed in a medium, and more specifically, the present invention relates to a liquid writing instrument that uses relatively high viscosity ink in which pigments and the like are dispersed in a medium. This invention relates to a liquid writing instrument that prevents ink from dripping as much as possible and allows smooth penetration of ink into the pen tip. Conventionally, there are pen nibs for writing instruments that use pigment ink that use fiber cores, sintered cores, plastic cores, etc., but all of them have thick handwriting.
One drawback was that it was not possible to obtain fine handwriting. On the other hand, in recent years, a liquid liquid has been developed in which, by pressing the writing tip, a valve body urged forward by an elastic body is opened, and the ink in the ink storage chamber is led out to the tip through an ink relay core and a sliding tube. With the advent of writing instruments, it has become possible to obtain fine handwriting. However, there was still room for improvement as ink sometimes dripped when the writing tip was pressed and ink did not penetrate smoothly into the pen tip. As a result of extensive research, the inventors of the present invention found that the wetting of the inner surface of the sliding tube with ink was caused by ink dripping and ink penetration into the pen tip. The present invention was completed by discovering that ester treatment improves wetting with ink, prevents ink dripping as much as possible, and smoothes ink penetration into the pen tip. That is, in the present invention, by pressing the writing tip, the valve body, which is biased forward by the elastic body, is opened and the ink in the ink storage chamber is transferred to the ink relay core.
In a liquid writing instrument that is led out to the tip through a sliding tube, one of the contact surfaces of the sliding tube with the ink
The gist of the invention is a liquid writing instrument characterized in that part or all of the writing instrument is treated with a solution containing rosin ester. It is not clear why the liquid writing instrument of the present invention prevents ink from dripping as much as possible when the writing tip is pressed, and why the ink penetrates smoothly into the pen tip, but it is speculated as follows. . In the liquid writing instrument of the present invention, the sliding tube is treated with a rosin ester solution, so the ink is well wetted, and as a result, there is no ink dripping due to air accumulation in the sliding tube, and air passages in the sliding tube. This seems to be possible to prevent as much as possible the inhibition of ink penetration into the pen tip due to ink clogging. Next, the method of treating the sliding tube of the present invention is as simple as immersing the sliding tube in a rosin ester solution for 1 to 3 minutes and then drying it, and the concentration of the rosin ester solution is 0.5 to 5.5. Weight% is preferable, and if it is lower than 0.5% by weight, the effect is weak, and 5.5% by weight
If it is higher, the pen tip may become clogged, resulting in the inability to write. Furthermore, as a solvent, any solvent can be used as long as it dissolves the rosin ester; specific examples thereof include aromatic solvents such as xylene and toluene, and cellosolves such as methyl cellosolve and ethyl cellosolve. . The present invention will be explained in more detail with reference to Examples below. In addition, "parts" in the examples indicate "parts by weight." Embodiment 1 FIG. 1 shows one embodiment of the structure of the present invention, and reference numeral 1 integrally has a curved portion 1a on the rear portion to apply a sliding force that easily bends due to writing pressure. Polyfluorinated ethylene, polypropylene,
An ink guiding core made of resin such as nylon or metal such as stainless steel or carbon steel. Reference numeral 2 is a sliding tube in which a small tube nib 2b made of metal, resin, ceramics, etc. with high wear resistance and corrosion resistance is protruded integrally or separately from the tip of a nib holder 2a made of metal, resin, etc.; The ink guiding core 1 is slidably inserted into the inside of the sliding tube 2 with its tip slightly protruding from the small tube nib 2b. It is particularly preferable from the viewpoint of wear resistance of the pen tip to form the ink guiding core 1 and the small tube nib 2b from metal or the like. The ink guiding core 1 has an ink relay core 3 made of a fiber bundle of nylon, polyester, acrylic, etc. whose rear end, that is, the end of the curved portion 1a, is fixed to the rear inner peripheral surface of the sliding tube 2. The rear end of the ink relay core 3 is connected to a valve rod 4b having a valve body 4a.
The valve body 4a is brought into pressure contact with the valve seat 4e by an elastic body 4d which is connected to the spring receiver 4c and the valve body 4a and has a resilient force stronger than the sliding force. At the same time, the ink relay core 3 and the sliding tube 2 are disposed in the sliding hole 5a of the front shaft 5 so as to be slidable and resiliently pushed forward. Incidentally, reference numeral 6 denotes an ink storage section made of urethane or the like, and is arranged around the ink relay core 3. In the above configuration, when a pressing operation is performed with the writing tip facing downward, the ink guiding core 1 first slides and sinks into the small tube nib 2b, and then the spring body 4
When the pressure is continued against the elastic force of d, the sliding tube 2 and the ink relay core 3 slide backward, and the valve rod 4b also moves backward, causing the valve body 4a and the valve seat 4e to move backward.
A gap is created between the two. At this time, the highly viscous ink stored in the ink storage chamber 8 in the rear shaft 7 passes through the gap, passes through the ink relay core 3, and passes through the small tube nib 2.
b. Here, when the pressure on the small tube nib 2b is released, the valve body 4a comes into pressure contact with the valve seat 4e again, and from then on, due to the slight sliding movement back and forth by the curved portion 1a of the ink guiding core 1, the small tube pen Ahead 2
Ink is ejected from the tip of b, allowing writing. A liquid writing instrument was obtained by immersing the sliding tube described above in the following treatment solution for 1 minute and air drying. (Treatment solution) A treatment solution obtained by stirring 97.0 parts of xylene and 3.0 parts of Hariestar (rosin ester, manufactured by Harima Kasei Kogyo Co., Ltd.) using a stirrer for 30 minutes. Comparative Example 1 A liquid writing instrument was obtained by treating a sliding tube in the same manner as in Example 1, except that the following treatment solution was used instead of the treatment solution in Example 1. (Treatment solution) A treatment solution obtained by stirring 97.0 parts of xylene and 3.0 parts of betsukasite (maleic acid resin: manufactured by Dainippon Ink and Chemicals Co., Ltd.) using a stirrer for 30 minutes. Example 2 A sliding tube similar to Example 1 was soaked in the following treatment solution.
A liquid writing instrument was obtained by soaking for a minute and air drying. (Treatment solution) A treatment solution obtained by stirring 99.0 parts of toluene and 1.0 part of Ester Gum H (rosin ester: manufactured by Arakawa Chemical Industries, Ltd.) using a stirrer for 30 minutes. Comparative Example 2 A liquid writing instrument was obtained in the same manner as in Example 2, except that toluene alone was used instead of the treatment solution in Example 2. Example 3 A sliding tube similar to Example 1 was soaked in the following treatment solution.
A liquid writing instrument was obtained by soaking for a minute and air drying. (Treatment solution) 95.0 parts of methyl cellosolve, ester gum AAL
A treatment solution obtained by stirring 5.0 parts of rosin ester (manufactured by Arakawa Chemical Industries, Ltd.) with a stirrer for 30 minutes. Comparative Example 3 Tamanol 100S (phenol resin: Arakawa Chemical Co., Ltd.) was used instead of the ester gum AAL solution in Example 3.
A liquid writing instrument was obtained in the same manner as in Example 3, except that the solution (manufactured by Alumni Co., Ltd.) was used. As described above, the liquid writing instruments obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were filled with white pigment ink (the ink used in Pentel Paint Marker Fine Point MSP5), and the pen tip ink penetration test and ink smearing test were performed. The results are shown in Table 1.

【table】

[Table] As shown above, in the liquid writing instrument of the present invention, since the sliding tube is treated with a rosin ester solution,
This is an excellent product that prevents as much ink as possible from dripping when the writing tip is pressed, and also allows the ink to penetrate smoothly into the pen tip. Note that the present invention is not limited to a small tube type liquid writing instrument that uses a sliding tube in which a small tube nib is attached to a nib holder as shown in the embodiment; Similar effects can be achieved in various liquid writing instruments in which sliding tubes with various types of pen nibs, such as tips and sintered nib nibs, are processed and used.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment showing the structure of the present invention. 1... Core for ink guidance, 2... Sliding tube, 2a
...Pen nib holder, 2b...Small tube nib, 3...
...Ink relay core, 4a...Valve body, 4b...Valve seat,
4d...Elastic body, 5...Front shaft, 5a...Sliding hole,
8...Ink storage chamber.

Claims (1)

[Claims] 1. A liquid writing instrument in which, by pressing the writing tip, a valve body urged forward by an elastic body opens and ink in the ink storage chamber is led out to the tip via an ink relay core and a sliding tube, A liquid writing instrument characterized in that part or all of the surface of the sliding tube that comes into contact with ink is treated with a solution containing rosin ester.