JPH1161025A - Marking-pen ink for writing board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a marking-pen ink for writing boards wherein a film is formed to allow a long-term prevention of solvent volatilization and a long- term storage of the pen. SOLUTION: This marking-pen ink comprises from 50 to 99 wt.% 1-4C aliphatic alcohol, from 1 to 20 wt.% pigment, from 1 to 20 wt.% pigment dispersing agent, from 0.01 to 0.09 wt.% fatty acid ester of disaccharides wherein the number of substitutions is from 1 to 3 and the HLB is 10 or larger and from 5 to 30 wt.% 6-12C saturated fatty acid triglyceride, based on the total amount of the ink. Since a film is formed at the surface of the pen point, the solvent does not volatilize and therefore the writing performance of the pen does not deteriorate, even when the pen point is exposed to air for a long time. Moreover, the film is thin and fragile enough to be destroyed as soon as pressure is applied to the pen point, so even in the case of intermittent use of the pen, the ink is smoothly discharged immediately after the writing is resumed, preventing the written lines from being blurred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink used for a marking pen for writing on a writing board made of a synthetic resin plate, a painted plate, or the like.

[0002]

2. Description of the Related Art In a conventional marking pen using a volatile solvent as a main solvent, when a pen tip is exposed to the outside for a long time with a cap removed, a solvent volatilizes and a coloring agent, a resin, etc. are dried and solidified. It was impossible to write. Also, especially when using a highly volatile solvent, even if the pen tip is exposed to the outside for a short time, the solvent on the pen tip surface volatilizes and ink does not come out immediately after writing starts, Problems such as blurring occurred. Therefore, when used in a lecture or the like, it is necessary to cap each time, which is troublesome. Furthermore, even when the marking pen was capped, the inside of the cap was not in a completely vacuum / sealed state, so the solvent could not be prevented from gradually evaporating from a slight gap in the cap. . Therefore, even after a long period of time even with the cap on, the solvent has already been volatilized and writing was impossible.
Under these circumstances, JP-A-57-28177 and JP-A-61-34080 have been proposed in the past in order to prevent dry-up. However, none of them could satisfy all of the above-mentioned problems.

[0003]

Accordingly, there is provided a marking pen ink for a writing board which prevents dry-up from a pen tip for a long time and a short time and which can be easily written on a writing board and then wiped off with a cloth or the like. The present inventor has succeeded in finding out after careful research.

[0004]

According to the present invention, the amount of ink is 50%.
-99% by weight of an aliphatic alcohol having 1 to 4 carbon atoms, 1 to 20% by weight of a pigment based on the total amount of the ink, 1 to 20% by weight of a pigment dispersant based on the total amount of the ink, and 0.1 to 0.2% by weight of the total amount of the ink. HL having a substitution number of 1 to 0.09% by weight
B10 or more disaccharide fatty acid ester, a marking pen ink for a writing board comprising 5 to 30% by weight of saturated fatty acid triglyceride having 6 to 12 carbon atoms with respect to the total amount of the ink.

[0005]

According to the present invention, the number of substitutions is 1 to 3 and HLB1
Since the disaccharide fatty acid ester of 0 or more and the saturated fatty acid triglyceride having 6 to 12 carbon atoms form a coating on the pen tip surface and suppress the volatilization of the solvent, it is considered that dry-up can be prevented. Since this coating is thin and brittle, it is destroyed at the moment when pressure is applied to the pen tip, and discharges ink immediately after the start of writing.

Hereinafter, the present invention will be described in detail. The solvent used in the present invention is an aliphatic alcohol having 1 to 4 carbon atoms. That is, one or more aliphatic alcohols selected from methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, isobutanol and tert-butanol are used. Since these solvents have relatively high safety, they are preferably used in the present invention, and about 55 to 95% by weight based on the total amount of the ink can be used.

The colorant used in the present invention is a pigment, and any conventionally known organic and inorganic pigments can be used without any particular limitation. Examples thereof include azo-based, phthalocyanine-based, anthraquinone-based, dioxazine-based and pigments. indigo·
Organic pigments such as thioindigo, verinone / berylene, isoindolenone, azomethyleneazo, carbon black, mica, titanium white, pearl pigment, iron oxide
An inorganic pigment such as a metal pigment such as aluminum powder and brass can be used. If these pigments are kneaded into a styrene-acrylic acid copolymer, a polyacrylic acid resin, polyvinyl alcohol, polyvinyl butyral, or the like to form a processed pigment, they are easily dispersed when mixed with a solvent, which is convenient. Alternatively, a commercially available processed pigment in which a pigment has already been kneaded in a dispersant may be used. Since the pigment does not stain the object to be written, it is preferably used for a marking pen for a writing board, and 1 to 20% by weight based on the total amount of the ink.
Can be used.

As the pigment dispersant used in the present invention, polyvinyl alcohol and polyvinyl butyral are preferably used because of their excellent solubility in the above-mentioned solvents, and can be used in an amount of 1 to 20% by weight based on the total amount of the ink.

In addition, in the present invention, a disaccharide fatty acid ester having 1 to 3 substituents and an HLB of 10 or more and a saturated fatty acid triglyceride having 6 to 12 carbon atoms are essential as a dry-up inhibitor. HLB1 having 1 to 3 substitutions
Zero or more disaccharide fatty acid esters are maltose-type disaccharides such as maltose and lactose or trehalose-type disaccharides such as trehalose and sucrose, one to eight of the eight hydroxyl groups, and acetic acid, propionic acid and butyric acid. Diesters of disaccharide fatty acid monoesters, disaccharide fatty acid diesters, and disaccharide fatty acid triesters are substituted by esterification with fatty acids such as caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid. Say. In the present invention, any disaccharide fatty acid ester among the above-mentioned disaccharide fatty acid monoester, disaccharide fatty acid diester, and disaccharide fatty acid triester can be used as long as it has an HLB of 10 or more. They can be used in combination. Although the disaccharide fatty acid ester exhibits an excellent effect as a dry-up inhibitor, it must be avoided to mix it in a large amount. If a large amount is blended, the writing line after writing on the writing board does not dry, and wiping becomes difficult. Therefore, the disaccharide fatty acid ester is not preferable because it has an adverse effect on the drying property of the writing line at 0.1% by weight or more based on the total amount of the ink.
0.1% by weight or less based on the total amount of the ink, especially 0.01 to
It is preferable to add 0.09% by weight. However, with such an amount, dry-up cannot be sufficiently prevented. Therefore, it has been found that the performance of dry-up prevention can be improved by adding a saturated fatty acid triglyceride having 6 to 12 carbon atoms without adversely affecting writing line drying. C6-C12 used in the present invention
The saturated fatty acid triglyceride is substituted by esterifying three hydroxyl groups of glycerin with a saturated fatty acid having 6 to 12 carbon atoms such as caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid and lauric acid. In the present invention, any saturated fatty acid triglyceride can be used, and arbitrarily selected ones can be used as a mixture. The saturated fatty acid triglyceride used in the present invention must be increased or decreased in inverse proportion to the increase or decrease in the amount of the disaccharide fatty acid ester, but 5 to 30% by weight can be used. The disaccharide fatty acid ester used in the present invention has 1 to 1 substitution.
3, and those having an HLB of 10 or more are used. However, those having a substitution number of 4 or more do not completely dissolve due to low solubility in the solvent of the present invention, and have the disadvantage that the ink is unstable over time and the substance is deposited. In addition, those having an HLB of less than 10 are not preferred because they have a drawback in that the film-forming ability on the pen tip surface is weak and a dry-up preventing effect cannot be obtained.

In the present invention, good results can be obtained by blending petroleum hydrocarbons, higher fatty acids, higher fatty acid esters, etc. in order to supplement the releasability of the writing lines.

Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

(Example 1) Ethanol 80.50% by weight Carbon black 5.00% by weight Polyvinyl butyral 4.00% by weight Sucrose monopalmitate 0.08% by weight Capric triglyceride 10.42% by weight Carbon black described above And polyvinyl butyral were put into a three-roll mill and mixed, and then mixed with the remaining substance using a propeller stirrer to give a viscosity of 7.0 mPa · s (25
C).

(Example 2) n-propanol 40.00% by weight isopropanol 35.00% by weight C.I. I. Pigment Red 166 4.00% by weight Polyvinyl butyral 4.00% by weight Sucrose monomyristate 0.05% by weight Caprylic acid triglyceride 16.95% by weight The above C.I. I. Pigment Red 166 and polyvinyl butyral in three rolls and mixed.
This was mixed with the remaining substance using a propeller stirrer to obtain a red ink having a viscosity of 7.5 mPa · s (25 ° C.).

Example 3 Ethanol 50.00% by weight n-butanol 28.00% by weight C.I. I. Pigment Blue 15: 3 5.00% by weight Polyvinyl butyral 4.00% by weight Sucrose monopalmitate 0.15% by weight Sucrose dipalmitate 0.05% by weight Capric triglyceride 12.80% by weight The above C.I. I. Pigment Blue 15: 3
And polyvinyl butyral were put into a three-roll mill and mixed, and then mixed with the remaining substance using a propeller stirrer to obtain a blue ink having a viscosity of 8.2 mPa · s (25 ° C.).

[0015]

Comparative Example 1 Ethanol 80.60% by weight Carbon black 5.00% by weight Polyvinyl butyral 4.00% by weight Capric triglyceride 10.40% by weight Excluding sucrose monopalmitate from Example 1, ethanol was 0.08% A black ink was prepared by increasing the weight%.

[0016]

Comparative Example 2 90.90% by weight of ethanol 5.00% by weight of carbon black 4.00% by weight of polyvinyl butyral 0.10% by weight of sucrose monopalmitate 0.10% by weight From Example 1, except for capric triglyceride, and adding ethanol to 10.42 A black ink was prepared by increasing the weight%.

Examples 1 to 3 and Comparative Examples 1 and 2
Table 1 shows the test results.

[Table 1] * Writability test after cap off (5h)… The cap of the batting-type marking pen impregnated with the ink was removed, the pen tip was exposed to the outside, and after 5 hours, writing was performed on the white board. * Blurring test after cap-off (5 m) ... The batting-type marking pen impregnated with the ink was removed by removing the cap, the pen tip was exposed to the outside, and after 5 minutes passed, it was written on a white board to check the writing line.

[0018]

The ink of the present invention forms a coating on the surface of the pen tip, so that even when the pen tip is exposed to the outside for a long time, the solvent does not volatilize and writing becomes impossible. In addition, since the coating is thin and brittle and is destroyed at the moment when pressure is applied to the pen tip, even when writing intermittently, ink is discharged smoothly immediately after re-starting the writing, and the writing line is not blurred. Furthermore,
Since the coating is formed, the solvent does not dry up for a long time, and the marking pen can be stored for a long time.

Claims (1)

[Claims] 1. An aliphatic alcohol having 1 to 4 carbon atoms in an amount of 50 to 99% by weight based on the total weight of the ink, 1 to 20% by weight of a pigment based on the total amount of the ink, and 1 to 20% by weight based on the total amount of the ink. Pigment dispersant, 0.01 to 0.
A marking pen ink for a writing board comprising 09% by weight of a substituted number of 1 to 3 disaccharide fatty acid esters having an HLB of 10 or more and 5 to 30% by weight of a saturated fatty acid triglyceride having 6 to 12 carbon atoms based on the total amount of the ink.