JPH0768484B2 - Marking ink composition - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a marking ink composition having excellent resistance to drying at a nib, and more particularly, to a nib that is left uncapped for a long time. Relates to a marking ink composition which is difficult to dry.

(Prior Art) Conventionally, a marking ink composition, that is, an oil-based ink has been widely used because it has few limitations on the writing material and has a quick-drying property, and a general oil-based ink having a fixing property and a so-called white plate having a peeling property. Erasing ink for use.

(Problems to be solved by the invention) However, because the oil-based ink is quick-drying, the solvent evaporates and the coloring material or resin is deposited on the surface of the pen tip if left uncapped. However, there is a problem that a film such as a resin is formed on the surface to cause scratches, or the writing becomes impossible.

(Means for Solving Problems) Therefore, the inventors of the present invention have finally completed the present invention as a result of intensive studies to solve the above problems. That is, the gist of the present invention is a marking ink composition comprising at least a coloring material, an organic solvent, and a compound represented by the following general formula.

(X: Acyl Group, Acid Residue, or Hydrogen) Each component of the present invention will be described in detail below.

The coloring material may be a dye or a pigment. As the dye, an oil-soluble dye or an alcohol-soluble dye that is soluble in an organic solvent can be used, and the pigment is not limited as long as it can be stably dispersed in the ink composition, but the surface is particularly coated with a resin. So-called processed pigments are preferable in terms of dispersibility, stability over time, and workability. The amount of these colorants used varies depending on the type of colorant and other ink components, but is 1 to 20% by weight, preferably 2 to 17% by weight, based on the total amount of the ink.

Examples of the organic solvent include alcohols such as ethanol, propanol, isopropanol and butanol, ketones such as methyl ethyl ketone and methyl isobutyl ketone, esters such as ethyl acetate and butyl acetate, aromatics such as benzene, toluene and xylene, and ethylene glycol. Cellosolves such as monoethyl ether, carbitols such as diethylene glycol monobutyl ether, and the like,
These can be used alone or in combination of two or more.

The amount of these organic solvents used is 55 to 90% by weight, preferably 65 to 85% by weight, based on the total amount of the ink.

The compound represented by the above general formula, which is the skeleton of the present invention, is used for preventing handwriting blur when the cap is removed and left, and specifically, ascorbic acid, ascorbic acid dipalmitate, phosphorus ascorbate. Acid ester magnesium salt and ascorbic acid sulfuric acid ester disodium salt are used, and the amount used is preferably 0.5 to 3% by weight with respect to the total amount of the ink.

In addition to the above components, general oil-based inks that have fixing properties include natural resins and synthetic resins that have been conventionally used in order to impart film-forming ability, adhesion to the writing surface, and viscosity adjustment of ink. -For example, rosin resin, cellulose resin, petroleum resin, ketone resin, polyvinyl butyral,
It is preferable to mix one or more vinyl chloride-vinyl acetate copolymers and use them in an amount of 1 to 30% by weight based on the total amount of the ink. As a so-called white plate erasing ink having a peeling property, in addition to the above-mentioned components, a releasing agent soluble in the organic solvent such as higher fatty acid ester, higher aliphatic hydrocarbon, polyoxyethylene alkether type It is necessary to mix one or more of ionic surfactants and their derivatives and polyoxyethylene alkylphenol ether type nonionic surfactants, and to use 1 to 10% by weight based on the total amount of the ink.

In addition to the above components, various additives such as antiseptic / antifungal agents and defoaming agents can be appropriately used, if necessary.

The marking ink composition of the present invention can be easily obtained by mixing and stirring or dispersing the above components using a known mixing stirrer or disperser.

(Function) It is not clear why the marking ink composition of the present invention prevents blurring of handwriting, but it is presumed as follows.

The compound represented by the general formula used in the present invention is simultaneously deposited when the solvent evaporates from the pen tip and the coloring material or resin is deposited, and forms a fragile film instead of a film due to a strong bond between the resins. . It is considered that the fragile film containing the compound represented by the general formula is broken by the pressure during writing, and thus scratches of handwriting are prevented.

(Examples) Hereinafter, the present invention will be described in more detail with reference to Examples. In the Examples, "part" means "part by weight".

Example 1 (ink having fixability) Varifast Red # 1808 (CI Acid Red mixture, manufactured by Orient Chemical Industry Co., Ltd.) 7 parts Tamanol 100S (oil-soluble phenol resin, manufactured by Arakawa Chemical Industry Co., Ltd. 4 parts Rosin WW ( Rosin resin, manufactured by Tokushima Essential Oil Co., Ltd. 1 part Ethanol 64 parts Ethyl cellosolve 20 parts Ethyl acetate 3 parts L-Ascorbic acid 1 part A red ink was obtained by stirring the above components for 2 hours with a homomixer.

Example 2 (ink having fixability) Neo Zabone Black RE (CI Solvent Black 27, BAS
(Manufactured by Company F) 16 parts Rosin WW 10 parts n-Propanol 12 parts Methylcellosolve 60.5 parts Ascorbic acid dipalmitate 1.5 parts A black ink was obtained in the same manner as in Example 1.

Example 3 (ink having releasability) Fuji AS black (processed pigment, manufactured by Fuji Dye Co., Ltd.) 8 parts Ethanol 45 parts Isopropanol 35.4 parts L-Ascorbic acid 1 part Hexadecyl 2-ethylhexanoate 6.8 parts Emulgen 408 (Poly) Oxyethylene oleyl ether, manufactured by Kao Soap Co., Ltd. 3.8 parts A black ink was obtained in the same manner as in Example 1.

Example 4 (ink having releasability) Fuji IK Blue (processed pigment, manufactured by Fuji Dye Co., Ltd.) 7 parts Butyl acetate 30 parts Methyl ethyl ketone 43.5 parts Methyl isobutyl ketone 7 parts Ascorbic acid dipalmitate 1.5 parts n-Butyl stearate 8 parts Liquid paraffin 3 parts A blue ink was obtained in the same manner as in Example 1 except that the above components were used.

Comparative Example 1 A red ink was obtained in the same manner as in Example 1 except that L-ascorbic acid was removed from Example 1 and ethyl cellosolve was added.

Comparative Example 2 A black ink was obtained in the same manner as in Example 1 except that ascorbic acid dipalmitate was removed from Example 2 and n-propanol was added accordingly.

Comparative Example 3 A black ink was obtained in the same manner as in Example 1 except that L-ascorbic acid was removed from Example 3 and isopropanol was added.

Comparative Example 4 A black ink was obtained in the same manner as in Example 1 except that ascorbic acid dipalmitate was removed from Example 4 and butyl acetate was added accordingly.

The results of the pen tip drying resistance test using the marking ink compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 are shown in the table.

(Effects) As described above, the marking ink composition of the present invention is excellent in practicality because it takes a long time until blurring of handwriting occurs when the cap is removed and left to stand.

Claims (1)

[Claims] 1. A marking ink composition comprising at least a coloring material, an organic solvent, and a compound represented by the following general formula. (X: represents an acyl group, an acid residue, or hydrogen)