JPS58112798A - Note using low-viscosity aqueous ink with composition for adjusting quantity of ink flowing out - 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 has an ink tank ζ; one end of the filled ink is separated from the ink backflow prevention composition; = Attached pen tip C made of rolling ball or thin rod etc.: Improvement of writing instrument C2.

The oil-based ink that has traditionally been used in ballpoint pens and other oil-based inks has a high viscosity of about 7θ00°C on average, so the composition for preventing ink backflow is
It is not necessary to provide the ink, and even if it is provided, the viscosity does not need to be so high that it will not adhere to the inner surface of the ink tank.

The reason for this is that since the oil-based ink has a high viscosity, the backflow stopper has a low viscosity, and even if the inner surface C2 of the ink tank is attached, the ink backflow phenomenon will hardly occur. (A ballpoint pen that uses oil-based ink and is equipped with a backflow prevention composition is widely known, for example, from Japanese Patent Publication No. 31-4319.) This well-known oil-based ink backflow prevention composition is When equipped with two writing instruments C using water-based ink, the ink tank will adhere to the inner surface of the ink tank (the second layer will be coated with the next layer of the composition).
C decreases, and then 6: disappears, causing the water-based ink to flow backwards due to vibrations, shocks, and other external forces, and leak from the end of the ink tank.

In addition, writing instruments using the above-mentioned high viscosity oil-based ink have a high viscosity, so it is difficult to push out the ink by using atmospheric pressure or by using the ink's own weight. However, if a writing instrument using low-viscosity water-based ink is exposed to direct atmospheric pressure or uses its own weight, the ink will be pushed out endlessly and flow out. Therefore, it is necessary to secure an appropriate amount of outflow by appropriate means.

Grease is used in the oil-based ink backflow prevention composition described above, and this grease is used for oil-based ink C
2. Since it is almost insoluble, there is no need to limit the composition, but the composition to be used must not contain water-soluble components, that is, water resistance and hydrophobicity. There is a restriction that compositions with poor quality cannot be used.

It has been discovered that viscous water-based inks have the ability to pull grease with greater surface tension than known greases.

In addition to the above findings, the inventor used two well-known ballpoint pens C that use high-viscosity oil-based ink to investigate the amount of ink flowing out. Therefore, it was found that there were C: variations depending on the product.

As a result of repeated research and experiments based on the above-mentioned knowledge C, the inventor has found that by utilizing the above-mentioned function of low-viscosity water-based ink to pull grease, an appropriate amount of outflow of the water-based ink can be achieved. I tried to secure it and was successful.

The present invention has been made based on the above findings, and the inner diameter of the ink tank is within the range of 2 to 10 mm, preferably 3.5 mm.
The low viscosity water-based ink has a viscosity of less than 100 cm, preferably less than 100 centiboise, preferably less than 100 centiboise, at 25°C. The product is prepared by adding additives such as lubricating oil, dispersant, antioxidant, and rust preventive agent to a soap-based or (and) non-soap-based hydrophobic thickener as the main ingredient. From the above, it is preferable to adjust the consistency to 200°C or higher, and further adjust the consistency (penetration at 25°C) to 385 to 175, which is correlated with the inner diameter of the ink tank.
A ballpoint pen with a moderate amount of water-based ink flowing out! - When used, even if the holding structure of the ball is uneven and varies from product to product, or even if the ball holding force of the synthetic resin holder is weak, an appropriate flow rate of the water-based ink can be secured. It is.

To explain the low viscosity water-based ink and composition used in the present invention, the composition of this water-based ink is the same as that of the well-known water-based ink, but the viscosity is 100 centipoise or less, preferably 40 centipoise or less. Compared to the well-known high viscosity oil-based ink ζ:, the amount of preparation and consumption is very small, and the length of the ink tank is limited. - place)
Ink tank (= Filling (2). Typical ink consumption is 80 to 2001 hours for low viscosity water-based ink.
9 / 100 m, and 17 ~ with high viscosity oil-based ink
It is 18■/l00rn.

In the composition, base ingredient C: As a soap-based hydrophobic thickener, it is possible to use an alkali metal salt of a hydrophobic aliphatic carboxylic acid such as calcium, aluminum, zinc, lead, barium, lithium, or strontium. Among the above-mentioned components, calcium alone, aluminum alone, hydrophilic ones such as sodium salts of fatty acids and potassium salts of fatty acids, and (2) can be used alone or in combination with the exception of sodium soap and the like.

As the non-soap hydrophobic thickener used as the main ingredient, inorganic ones such as bentonite (e.g. bentonite organic cation activator, quaternary one having two long-chain alkyl groups with 16 to 18 carbon atoms), There are some ammonium salts (surface-treated ones), and organic ones.
Allyl ureas, indanthrene 1. These include phthalocyanine, terephthalamate, carbon black, etc., and each of these components can be used alone or in combination. It is also possible to use a mixture of soap-based thickeners and non-soap-based thickeners, and even if the sodium salts and potassium salts are hydrophilic, as long as they are used in small amounts, Hydrophobic thickeners (can be used in combination.Also, it is also possible to use thickeners with improved water resistance by adding alkali salts of aliphatic carboxylic acids (or metal salts of simple carboxylic acids). A complex soap obtained by mixing a high molecular weight aliphatic carboxylic acid (:, a low molecular weight carboxylic acid such as acetic acid) and reacting it with an alkali can also be used as a thickener.

The main ingredient of the composition! In addition to well-known mineral oils, the lubricating oils to be added include synthetic diester oils (e.g., 2-ethylhexyl separate, etc.), silicone oils (e.g., polymethyl, phenyl, silochitin, etc.), and liquid oil (e.g., poly, alkylene glycol, etc.), herocarbon oil (e.g. OnF, n, etc.) can be used alone,
Additionally, mineral oils, synthetic oils, etc. can be mixed and used.

Additives for the composition include glycerin, higher alcohols, etc. as dispersants to promote the dispersion of the thickener, and aromatic amine compounds (for example,
phenyl alpha naphthylamine, alkyl phenols), sulfur acid selenium compounds (selenium compounds are
For example, thiodiphenylamine, ethyl phosphate, etc.), amines, petroleum sulfonan salts, etc. are used as rust preventive agents to prevent metal ink tanks and balls from rusting, and these dispersants and antioxidants. ,
The rust preventive agent is added as appropriate. In this way, a composition with excellent hydrophobicity, water resistance, etc. is obtained.

The composition has a dropping point of 80° C. or higher, preferably 200° C. or higher (2), but this is only possible during high-temperature periods such as summer when the inside of the shaft is housed in a sealed state. If the temperature inside the ink tank rises to 75°C or higher, and if the dropping point is below aOC, the composition will become fluid and the low viscosity water-based ink will flow back and leak from the end of the ink tank. This is because they are used to it.

The composition has a consistency (penetration at 25°C) of 385 (J
IS consistency number θ) to l75 (same number 4),
This range of consistency is based on the inner diameter of the ink tank from 2 to 10 cm.
When two compositions are used, the consistency is ≦2.

As a result of experiments, it was found that the consistency of the composition had a correlation with the inner diameter of the ink tank, so the above range was determined based on this result. If the consistency is over 385, it will be too soft and will be easily affected by shock and temperature changes, and will easily adhere to the inner surface of the ink tank.If it is under 175, it will be too hard and have low viscosity. There are drawbacks such as over-suppressing the outflow of water-based ink and making it difficult to fill the ink tank. In the above consistency range C2, the thinner the inner diameter of the ink tank, the softer the composition is used,
The thicker the inner diameter, the harder the consistency is used.

In a writing experiment using a composition having the above consistency range, it was confirmed that there was no adhesion at all to the inner surface 1 of the ink tank.

The blending ratio of the composition can be varied depending on the consistency, but the main ingredient should be 5 to 30% and the lubricant should be 85 to 60%.
% and an additive at a ratio of 10% was prepared and a written experiment was conducted, and good results were obtained.

There are many ways to consider the amount of the composition to be filled in an ink tank, but the results of experiments have shown that 0.49 is 4% compared to 0.79 ink filling amount.

When constructing a writing instrument, an adjustment member that allows ink to flow can be provided between the ink and the pen tip to adjust the balance and/or pressure of the ink.

Next C: Shows the results of the written experiment.

Notes Experiment 1 Inner diameter of ink tank used for writing instrument components 5.2 Ball holder Diameter of polyacetal ball
0.8 ■ Filling amount of ink in the ink tank 0.7 Filling amount of N composition (soap type) 0.49 Speed
71 / Paper load
20ON angle 60
0 In the experiments conducted using the above-mentioned materials, filling amount, conditions, etc., an appropriate amount of ink flowed from the beginning of writing to the end of writing, no overflowing phenomenon or underflowing phenomenon was observed, and the composition (
Adjustment of ink flow rate by two methods was conveniently carried out to obtain favorable ink consumption.

Even within the range of 385 to 175, the consistency of the composition is only 2: the lower and harder the inner surface of the ink tank C: it does not adhere at all and moves with the ink (- it has excellent ink flow control function) At the same time as these results, as the consistency of the composition becomes higher and the composition becomes thicker, the ink outflow adjustment function weakens, and a large amount of ink (g2, so that it flows out, It was also confirmed that the ink was consumed quickly and the consistency became low and hard (=therefore, the adjustment function was strengthened and the ink flowed out little by little).

Experiment 2 Inner diameter of the ink tank used for the writing instrument components 3.4■ Ink filling amount of the filling in the ink tank 0.359 Filling amount of composition (soap-based) 0.11 I writing conditions In this experiment, the ink and I tried testing by changing the inner diameter of the tank and the amount of filler.

The consistency of the composition in this experiment ranged from 385 to 175, and a softer one with slightly higher C2 gave better results. When a composition with the same consistency as in Experiment 1 was filled, due to the difference in the inner diameter of the ink tank, the ink consumption was the same as in Experiment 1.
．． Irrigation also decreased.

And if the consistency of the composition is high and soft,
Experiment 1. Similar results were obtained.

Experiment 3 Inner diameter of the ink tank for the components of the writing instrument used 2.0 Amount of ink filled in the ink tank 0.259 Amount of composition (soap-based) filling 0.03 fl Writing conditions In this experiment, the inner diameter of the ink tank was A test was conducted by changing the filling amount of the filler from the two experiments described above.

The consistency of the composition in this experiment was in the range of 385 to 175, and the consistency of the composition was slightly C: higher and softer showed better results, but Experiment 1. When a composition with the same consistency as in Experiment 1 was filled, the ink consumption was the same as in Experiment 1 due to the difference in ink inner diameter i; i=decreased even more than that. The same findings as in Experiment 1 were obtained when the consistency of the composition was made extremely soft and when it was made low and hard.

Experiment 4 Inner diameter of scribe component ink tank used 8.0 Filling in ink tank Ink filling 1 1.51) Filling amount of composition (soap-based) o, a g Writing conditions In this experiment, A test was conducted by changing the inner diameter of the ζ ink tank and the amount of filling material compared to the three experiments described above.

The consistency of the composition in this experiment ranged from 385 to 175, with the lower and harder the better the results.

This is a general extinguisher for low viscosity water-based ink (the range of All in = is 0.08 to 0.18 C9/100rn).
The appropriate amount of ink consumption in Experiment 3. and 2. is when the consistency of the composition is 283. In this case, the consistency was 340 and 283, and Experiment 4. It can be seen that the consistency is 5.

Patent applicant: Ogawa Kako Co., Ltd.

Claims (1)

[Claims] Ink tank (2) One end of the filled ink has a composition for preventing ink backflow, and the other end of the ink tank is the tip C of the ink tank. The inner diameter of the tank is 2~IOwm
r: The above ink has a viscosity of 100 at 25°C.
A low viscosity water-based ink of centipoise or less is used, and the above composition is prepared by using a soap-based or (and) non-soap hydrophobic thickener as the main ingredient, adding lubricating oil and additives to this main ingredient, and A writing utensil using a low viscosity water-based ink, comprising an ink flow rate regulating composition, which is used with a point v of 80° C. or higher and a consistency (penetration at 25c) of 385 to 1751:lie.