JP4841925B2 - Ink follower for oil-based applicators - Google Patents

Description

The present invention relates to an ink follower used for a tail end portion of an oil-based ink applicator that directly stores ink in an ink storage tube.

Conventionally, as having an ink storage part that stores ink in a raw ink state, for example, a ballpoint pen with a writing part such as a ballpoint pen tip connected to one end and an open end or a tail plug having an air hole arranged on the other end Are known. Such an ink container is provided with an ink follower between the outside air and the ink interface that follows the ink consumption and moves forward to prevent ink scattering and solvent volatilization. .

As such liquid ink followers, those based on non-volatile oils such as mineral oil, silicone oil, ester oil, polybutene and the like are often used. For example, Patent Document 1 discloses an ink backflow preventive composition for a writing instrument, which uses silicone oil as a hardly volatile liquid or a non-volatile liquid, and contains a gelling agent and N-alkylpyrrolidone. However, since silicone oil has a high gas permeability, an ink containing a low-polarity volatile liquid such as xylene, cyclohexane, or methylcyclohexane has a problem that these highly volatile solvents pass through and are volatilized. Furthermore, Patent Document 2 discloses an ink follower using a hardly volatile organic liquid or a non-volatile organic liquid as a base material, and using a gelling agent and alkylated naphthalene and / or alkylated phenol. However, these adjust the hardness of the ink follower only with a gelling agent, so if stored for a long period of time or stored in a poor environment, it is easy to change over time, chemically thickening and following performance There were problems such as lowering.

Patent Document 3 discloses a non-aqueous ballpoint pen comprising at least one solvent composed of a hardly volatile and / or nonvolatile liquid hydrocarbon, a substance that forms a suspension with the solvent, and a styrene-based thermoplastic elastomer. A follower is disclosed. However, styrenic thermoplastic elastomers are low-polar organic solvents, such as water-based inks that are less likely to bleed. Since they are similar, they are compatible and cannot be used.
Japanese Patent Laid-Open No. 2003-226811 JP 2001-096973 A Japanese Patent Laid-Open No. 2003-237279

In addition, in the conventional fluid applicator, a solid ink follower using silicone rubber or the like that is resistant to impact and does not change with time is also known, but as described above, a low-polarity volatile liquid was blended. In the fluid, there is a problem that the volatilization preventing effect is insufficient and the rubber swells and cannot move.

In view of the above situation, the present invention is compatible with a non-aqueous applicator using a low-polar solvent, so that the solvent and the ink are not compatible, prevent the solvent from volatilizing, and have high followability and impact resistance. An ink follower having both of the above is provided. Another object of the present invention is to provide a liquid ink follower that is stable without changing the initial quality even under high temperature and long-term storage, and that can exhibit its performance until the end of writing.

That is, the present invention is, (A) at least sparingly volatile liquid material, and this containing (B) fibrous body (excluding no visible sheet, powder, filamentous materials, sticks, a three-dimensional object), furthermore, the fiber The blending amount of the body is 2% by weight or more and 40% by weight or less, the fiber body is a fiber of 1 dtex to 150 dtex, and contains inorganic powder such as fine powder silica. .

According to the present invention, there is a stable followability regardless of the writing flow rate and the refill diameter, and the impact applied to the pen body does not cause blurring of the drawn lines due to the ink follower not following during writing. Therefore, the ink follower for an oil-based applicator is provided in which the ink follower does not scatter and the ink does not flow out from the ink storage tube even when the pen body is stored at a high temperature.

The hardly volatile liquid that can be used in the present invention is selected from those having three basic performances: incompatible with oil-based ink, prevention of volatilization of oil-based ink, and difficulty in self-volatilization. Examples thereof include one or a mixture of two or more of glycerin, polyglycerin, polyethylene glycol, polypropylene glycol, glycerin fatty acid ester, polyglycerin fatty acid ester, and polyglycerin alkylene oxide adduct. Among these, diglycerin propylene oxide is most excellent in terms of preventing sagging.

In order to improve the backflow prevention performance, inorganic powder such as calcium carbonate, talc, mica, clay, iron oxide, alumina, magnesium oxide, silica, titanium oxide and the like can be appropriately used as a structural viscosity imparting agent. . In addition, organic structural viscosity-imparting agents such as organic bentonite, 12-hydroxystearic acid and its derivatives, dibenzylidene sorbitol, and xanthan gum can also be used as appropriate. As a compounding quantity of these structural viscosity imparting agents, 5 to 10 weight% is preferable.

Examples of the fibrous body that is the main point of the present invention include animal hair fibers, vegetable fibers such as cotton, silk, artificial polymer fibers, etc., but polymers that can easily control the fiber diameter, length, twist, etc. A fiber consisting of is particularly preferred. Preferred polymer fibers for use include polyethylene, polypropylene, nylon, vinylon and the like. The blending amount of the polymer fiber is 2% or more and 40% or less, preferably 5% to 20% by weight. If it is 2% or less, the followability cannot be prevented, and if it is 40% or more, the apparent viscosity becomes too high and the followability is deteriorated. Further, it is preferable that the fibrous body is a fiber of 1 dtex to 150 dtex. If the fibrous body is 1 decix or less, the surface energy of the fiber is large, so that it is easy to cause a chemical change.If the fibrous body is 150 decitex or more, the liquid ink follower does not artificially thicken and is resistant to resistance. Impact and other effects will be weakened.

Hereinafter, actual examples of the ink follower of the present invention will be described. The ink follower of the present invention is prepared by adding a predetermined amount of powdered silica to a hardly volatile or non-volatile liquid used as a base material, adjusting with three rolls, adding nylon fiber thereto, and stirring. .

EXAMPLES Next, although an Example, a comparative example, etc. are given and this invention is demonstrated in detail, this invention is not limited at all by the following Example.

Examples 1-6, Comparative Examples 1-7
The ink follower was adjusted by the composition shown in Table 1 and Table 2 below and the above method. In addition, the compounding% of each component in Table 1 and Table 2 is based on weight%.

The ink followers of Examples 1 to 6 and Comparative Examples 1 to 7 were filled in the ink containing tube as an ink follower composition of CLN-250 manufactured by Mitsubishi Pencil Co., Ltd. Carried out. These results are shown in Tables 1 and 2.

[Test 1] Drop impact resistance test method
A test based on JIS S 6037 was performed.
With the pen tip of each pen body facing upward, the pen body is dropped once from a height of 1.0 m onto a 3 cm thick cedar board, and the pen body after the fall is visually observed, and the ink follower is scattered outside the ink storage tube. The degree of was evaluated according to the following evaluation criteria.
Evaluation criteria:
A: Visually no change from before dropping. The interface between the ink and the ink follower is also very clear.
A: There is no scattering of the ink follower, and the interface between the ink and the ink follower is clear.
Δ: No scattering of the ink follower is observed, but the interface between the ink and the ink follower is slightly disturbed compared to before the pen body is dropped.
X: Scattering of the ink follower is clearly recognized, and the ink flows backward out of the ink storage tube.

[Test 2] Followability Each pen body was left for one month with the pen tip (cap side) facing upward at 50 ° C. and humidity of 65%, and after taking out, printed on plain paper for copying and having a width of 7 mm. The state of the ink follower when the line was painted 10 cm was visually observed.
Evaluation criteria:
(Double-circle): There was no change visually at the beginning of use, and the ink follower followed the ink with almost no adhesion to the ink containing tube.
○: No tearing was confirmed, and the ink follower followed the ink with almost the same volume.
Δ: A slight lump was broken during writing, but most ink followers followed the ink.
X: The ink did not follow and stopped in the middle of writing. Or more than one third of the lump broke off during writing.

[Test 3] Each sacrificial pen body was left for one month with the pen tip (cap side) facing upward at 50 ° C. and humidity of 65%, and after taking out, the state of the ink follower was evaluated according to the following evaluation criteria. .
Evaluation criteria:
A: The ink follower did not change at all as compared to before.
○: The ink follower hardly deformed.
Δ: The ink follower was deformed but did not flow out of the ink storage tube.
X: The ink follower flowed out of the ink containing tube.

As is clear from the results of Tables 1 and 2, Examples 1 to 6 that are within the scope of the present invention are more satisfactory for all performance than Comparative Examples 1 to 7 that are outside the scope of the present invention. It turned out to be an excellent one that can. That is, the ink follower of Example 1 has (a) good impact resistance, (b) good follow-up after time, (c) the ink follower itself, or oil sagging due to oil separation. No cross-flow phenomenon occurs, so that it has excellent performance.

Claims (8)

An ink follower for an oil-based applicator comprising at least a hardly volatile liquid material and a fibrous body (excluding thin plates, powders, threads, rods, and three-dimensional objects that are visible) . The ink follower for an oil-based applicator according to claim 1, wherein the fiber body is a polymer fiber. The ink follower for an oil-based applicator according to claim 1 or 2, wherein the amount of the fibrous body is 2 wt% or more and 40 wt% or less. The ink follower for an oil-based applicator according to any one of claims 1 to 3 , wherein the fibrous body is a fiber of 1 decitex to 150 decitex. The ink follower for an oil-based applicator according to any one of claims 1 to 4 , wherein the hardly volatile liquid material is propylene oxide of diglycerin. The ink follower for an oil-based applicator according to any one of claims 1 to 5 , which has a structural viscosity by a structural viscosity imparting agent. The ink follower for an oil-based applicator according to claim 6 , wherein the structural viscosity imparting agent is contained in an amount of 5 to 10% by weight. The ink follower for an oil-based applicator according to claim 7 , wherein the structural viscosity imparting agent is an inorganic powder.