JP3909951B2 - Oil-based ink for marking pens - Google Patents

Description

【００１３】
【効果】
特定の飽和脂肪酸エステルを配合したため、キャップを外したまま放置しておいてもペン先にて弱い皮膜を形成し、インキのドライアップを防止できる。再度筆記する際は、皮膜が容易に壊れて筆記可能となる。また、本発明はセット時間が影響されないので、すぐに乾燥する筆記線を得られる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil-based ink used for a so-called quick-drying oil-based marking pen on which a writing object can be written regardless of whether it is absorbent or non-absorbable.
[0002]
[Prior art]
Quick-drying oil-based marking pens can be written not only on paper, but also on glass, ceramics, cloth, etc., and the writing line dries quickly after writing, but on the other hand, leave the cap removed. However, the pen tip dries and the resin and the like are cured, which makes it impossible to write. This is so-called dry-up.
In order to solve this drawback, oil-based inks containing various dry-up preventing agents are disclosed in JP-A 51-120826, JP-B 52-44244, JP-A 57-28177, JP-A 61-34080, JP-A 61-61. -261380, Japanese Patent Laid-Open No. 62-135578, etc. are disclosed.
However, in order to effectively prevent dry-up, it is necessary to add a large amount of the dry-up inhibitor, and then the writing line drying time (hereinafter referred to as the maximum characteristic of oil-based ink) The new set-up time has been delayed.
[0003]
[Problems to be solved by the invention]
Therefore, as a result of research, the present applicant has succeeded in finding an oil-based ink having contradictory performance such as dry-up resistance and a short setting time.
[0004]
[Means for Solving the Problems]
An oily ink for a marking pen containing at least a dye, an organic solvent, a resin soluble in the organic solvent, and a saturated fatty acid ester, wherein the saturated fatty acid ester is selected from tetradecanoic acid, pentadecanoic acid, or hexadecanoic acid The above problem can be solved by an ink that is a saturated fatty acid ester with a higher aliphatic alcohol selected from decanol, pentadecanol, hexadecanol, heptadecanol, or octadecanol.
Further, the dye is a salt-forming oil-soluble dye, and the organic solvent is selected from methanol, ethanol, propanol, butanol, or a lower aliphatic alcohol obtained by mixing two or more, or the lower aliphatic More preferred is an ink which is a mixed solvent of alcohol and lactic acid ester and the resin is a ketone formaldehyde resin, an alkylphenol resin, or a rosin-modified resin.
Further, an ink in which the saturated fatty acid ester is 0.01% by weight to 1.00% by weight, particularly 0.55% by weight to 0.95% by weight with respect to the total amount of the ink is more preferable.
[0005]
Hereinafter, the present invention will be described in detail.
In the present invention, an oil-soluble dye is used as a colorant, and oil-soluble dyes such as monoazo, disazo, metal complex type monoazo, anthraquinone, phthalocyanine, triallylmethane, etc. that are generally available as oil-based marking pen dyes can be used. Of these, salt-forming oil-soluble dyes show the most preferable results. The salt-forming oil-soluble dye is a dye in which a hydrophilic group such as an acid dye, a direct dye, or a basic dye is substituted with a hydrophobic group. In the present invention, the hydrophilic group of the acid dye is replaced with a cationic activator, a resin base, or an amine.・ Substitutes substituted with hydrophobic groups such as basic dyes, direct dye hydrophilic groups substituted with hydrophobic groups such as cationic bases, resin bases, amines, basic dyes, etc., hydrophilic groups of basic dyes anionic activators・ Replaced with hydrophobic groups such as resin acids, acid dyes, and direct dyes.
[0006]
The organic solvent must be a lower aliphatic alcohol and is selected from methanol, ethanol, propanol, and butanol. Propanol and butanol have isomers, respectively, but all structures such as normal, iso, and tertiary can be used. The lower aliphatic alcohols may be used alone or in combination of two or more. Also, good results can be obtained by using a mixture of these lower aliphatic alcohols and lactic acid esters. The lactate ester is selected from methyl lactate, ethyl lactate, propyl lactate and butyl lactate. Propyl lactate and butyl lactate each have isomers, but those having all structures such as normal, iso, and tertiary can be used.
[0007]
As the resin, an oil-soluble resin can be used, and a rosin resin, an ester resin, a cellulose resin, a phenol resin, or the like can be used. In particular, a ketone formaldehyde resin or an alkylphenol resin is preferably used.
[0008]
The saturated fatty acid ester is a saturated fatty acid of a higher fatty acid selected from tetradecanoic acid, pentadecanoic acid, and hexadecanoic acid, and a higher fatty alcohol selected from tetradecanol, pentadecanol, hexadecanol, heptadecanol, and octadecanol. Esters are used. The higher fatty acid and the higher aliphatic alcohol each have a number of isomers, but if the melting point of the esterified saturated fatty acid ester is not 20 ° C. or lower, a straight chain or a branched chain is formed. Any of them can be used. In the present invention, tetradecyl tetradecanoate, tetradecyl hexadecanoate, hexadecyl tetradecanoate, hexadecyl hexadecanoate, octadecyl tetradecanoate, and octadecyl hexadecanoate are particularly preferably used, and the linear one provides the best results.
The said saturated fatty acid ester can be used individually or in mixture of 2 or more. The blending amount exhibits the effect of the present application in the range of 0.01% by weight to 1.00% by weight with respect to the total amount of the ink, but the range of 0.55% by weight to 0.95% by weight shows particularly preferable results. .
[0009]
In the present invention, additives usually used in inks such as preservatives, fungicides, dye solubilizing agents such as amines, penetrants such as benzyl alcohol can be added.
[0010]
【Example】
Hereinafter, the present invention will be described with reference to examples.
Example 1
Tartrazine and Rhodamine 6G salt-forming dye 6.0% by weight
Ethanol 66.0% by weight
Ethyl lactate 16.0% by weight
Alkylphenol resin 11.4% by weight
Tetradecyl tetradecanoate 0.3% by weight
Hexadecyl hexadecanoate 0.3% by weight
The above substances were mixed to obtain a red ink.
(Comparative Example 1)
A red ink was prepared from Example 1 by removing tetradecyl tetradecanoate and hexadecyl hexadecanoate.
(Example 2)
Victoria Pure Blue and Acid Phthalocyanine Blue salt-forming dye 6.0% by weight
Ethanol 61.0% by weight
n-propanol 18.0% by weight
Ketone formaldehyde resin 14.2% by weight
Tetradecyl hexadecanoate 0.5% by weight
Octadecyl tetradecanoate 0.3% by weight
The above substances were mixed to obtain a blue ink.
(Comparative Example 2)
A blue ink was prepared from Example 2 by removing tetradecyl hexadecanoate and octadecyl tetradecanoate.
(Example 3)
Tartrazine and Rhodamine 6G salt-forming dye 6.0% by weight
n-propanol 73.0% by weight
n-Butanol 10.3% by weight
Ketone formaldehyde resin 10.0% by weight
Tetradecyl tetradecanoate 0.2% by weight
0.4% by weight of hexadecyl tetradecanoate
Octadecyl hexadecanoate 0.1% by weight
The above substances were mixed to obtain a red ink.
(Comparative Example 3)
A red ink was prepared from Example 3 except for tetradecyl tetradecanoate, hexadecyl tetradecanoate and octadecyl hexadecanoate.
Example 4
Tartrazine and Rhodamine 6G salt-forming dye 6.0% by weight
Ethanol 66.0% by weight
Ethyl lactate 16.0% by weight
Alkylphenol resin 11.4% by weight
Tetradecyl tetradecanoate 0.1% by weight
Hexadecyl hexadecanoate 0.1% by weight
The above substances were mixed to obtain a red ink.
(Comparative Example 4)
A red ink was prepared by removing tetradecyl tetradecanoate and hexadecyl hexadecanoate from Example 4.
[0011]
The marking pen consisting of a fiber pen core, a main body provided with an ink absorber, and a cap was filled with the inks of the examples and comparative examples and tested.
In a room with a temperature of 20 ° C. and a humidity of 65%, the marking pen was removed and left for 8 hours, and then written on paper to examine the writing property immediately after writing.
○: A clear writing line was obtained.
X: Only a faint writing line was obtained.
The marking pen was used to write on a polypropylene OHP film, and the set time was examined.
The test results are tabulated below.
[0012]
[Table 1]

[0013]
【effect】
Since a specific saturated fatty acid ester is blended, a weak film is formed at the pen tip even when the cap is left with the cap removed, and ink can be prevented from drying up. When writing again, the film is easily broken and can be written. Moreover, since the setting time is not affected in the present invention, a writing line that dries quickly can be obtained.

Claims (4)

Salt-forming oil-soluble dye , organic solvent, resin soluble in organic solvent, oil-based ink for marking pen containing at least saturated fatty acid ester, wherein the saturated fatty acid ester is selected from tetradecanoic acid, pentadecanoic acid or hexadecanoic acid An oil-based ink for marking pens, which is a saturated fatty acid ester of a higher fatty acid selected from tetradecanol, pentadecanol, hexadecanol, heptadecanol, or octadecanol.   The organic solvent is a lower aliphatic alcohol formed by mixing one or more selected from methanol, ethanol, propanol, and butanol, or a mixed solvent of the lower aliphatic alcohol and a lactic acid ester. Oil-based ink for marking pens.   The ink for a markin pen according to claim 1 or 2, wherein the resin is a ketone formaldehyde resin, an alkylphenol resin, or a rosin-modified resin.  4. The oil-based ink for marking pens according to claim 1, wherein the saturated fatty acid ester is 0.01 wt% to 1.00 wt% with respect to the total amount of the ink.