JPH02232277A - Ink for marking pen - Google Patents

Abstract

PURPOSE:To obtain an ink improving drying resistance of a pen point without spoiling marking characteristics of the writing face by compounding a colorant, a resin, an org. solvent having affinity with water and hexaglyceryl tristearate. CONSTITUTION:An ink wherein a colorant, a resin, an org. solvent having affinity with water and hexaglyceryl tristearate of the formula (wherein m+n=5; m=0-5; n=0-5) are at least incorporated. The coloring agent to be used includes, oil-soluble dyes, alcohol-soluble dyes, solvent dyes, org. pigments, carbon black, and titanium white and the loading in the ink compsn. is 1-20wt.%. The loading of the resin in the ink compsn. is pref. 1-30wt.%. The loading of the solvent in the ink compsn. is 20-98wt.%. Hexaglyceryl tristearate incorporated exhibits especially its effect to only such org. solvents that have affinity with water and the loading thereof is 0.01-10wt.% in the ink compsn.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to improving the drying resistance of the nib of a marking ben ink.

(Prior art) Conventional general marking inks contain low-grade fat so that the handwriting marked on the writing surface dries almost instantly, making it possible to mark all surfaces including ink-impermeable surfaces. Volatile organic solvents such as group alcohols, esters, glycol ethers, and ketones are used. Therefore, if conventional marking pens are left with the cap removed, these organic solvents will evaporate and colorants and resins will precipitate on the pen tip, forming a film on the surface of the pen tip, which can cause blurred handwriting and In severe cases, this had the disadvantage of causing an inability to write.

(Problem to be Solved by the Invention) Therefore, the present invention provides a method that allows the handwriting marked on the writing surface to dry almost instantly, allowing marking to be performed on any surface including non-ink penetrating surfaces, and without impairing the performance of the marking pen. The purpose of the present invention is to provide a marking ink that improves the drying resistance of the tip.

(Means for Solving Problems) In order to achieve the above object, the marking ink of the present invention contains a colorant, a resin, an organic solvent having an affinity for water, and the following general formula n-0 to It contains at least hexaglyceryl tristearate represented by 5. Ru.

The coloring agents contained in the present invention include oil-soluble dyes generally used in oil-based marking inks, solvent dyes such as alcohol-soluble dyes and spirit-soluble dyes, azo, anthraquinone, indigo, lid cyanine, etc. Triphenylmethane or chitansan-based organic pigments, carbon black, titanium white, etc. can be used, and the content thereof is 1 to 20% by weight in the ink composition.

The resins contained in the present invention include rosin, ester gum, rosin derivatives such as rosin-modified maleic acid resin, ketone resin, soluble phenol resin, methyl or ethyl cellulose, hydroxyalkyl cellulose derivative, styrene-maleic acid copolymer, vinyl butyral. ，
Resins commonly used in oil-based marking inks, such as vinyl polymers such as vinyl acetate, vinyl acetate-vinyl chloride polymers, and vinyl pyrrolidone, can be used, and the content thereof is 1 to 30% by weight in the ink composition.

The solvent contained in the present invention needs to have good affinity with water, such as lower aliphatic alcohols such as methanol and ethanol, esters such as methyl acetate and ethyl acetate, etc.
Glycol ethers such as methyl cellosolve, ethyl cellosolve, and brobylene glycol monomethyl ether,
Organic solvents such as ketones such as acetone and MEK can be used, and the content thereof is 20 to 98% by weight in the ink composition.

The hexaglyceryl tristearate contained in the present invention is particularly effective only against the above-mentioned organic solvents that have an affinity for water, and its content is 0.01 to 10.00 in the ink composition. It is expressed as weight percent, but preferably 0.1 to 2.0 weight percent.

In the present invention, other necessary additives can be included depending on the purpose. For example, for writing boards such as whiteboards, it contains a handwriting remover.

(Function) By using an organic solvent that has an affinity for water and containing hexaglyceryl tristearate,
A brittle thin film is formed on the surface of the pen tip to prevent solvent evaporation.
When marking, the thin film is easily destroyed and acts to prevent blurring of handwriting.

(Example) A formulation example of an example of the present invention is shown below. In addition, the unit of the number is weight %.

Example 1 Coloring agent (Varifast Red 1308) Natural mouth zinc ethyl cellosolve methyl cellosolve hexaglyceryl tristearate 7.0 5.0 74.5 1 3.2 0.3 Example 2 Coloring agent (nigrosine base) Phenol Resin ethanol ethyl cellosolve oleate hexaglyceryl tristearate Example 3 Coloring agent (carbon black) Vinyl chloride vinyl acetate copolymer MI BK Ethyl acetate hexaglyceryl tristearate Example 4 Coloring agent (phthalocyanine blue) Polyvinyl butyral ethanol isobrobanol Polyoxyethylene alkyl ether sebacate dioctyl hexaglyceryl tristearate 1 0.0 2.0 60.0 2 2.7 5.0 0.3 3.0 4.0 7 8.0 1 4.8 0.2 3.5 4.0 6 6.4 1 6.6 4.0 5.0 0.5 The ink of each example prepared from the above formulation and the ink of each comparative example to be described later were mixed in separate marking pens. Fill the batting and remove the cap of each marking pen to expose the fiber core nib at a temperature of 25 degrees Celsius and a humidity of 6 degrees.
The handwriting was left in a room with 5% humidity, and the time it took for the handwriting to fade was measured. The results are shown in Table-1. In addition, Comparative Example 1-1 contained the same amount of hexaglyceryl distearate instead of hexaglyceryl tristearate in Example 1, and Comparative Example 1-2 contained the hexaglyceryl distearate of Comparative Example 1-1. Instead of the rate, the amount (0
．． 3% by weight) with increased ethyl cellosolve,
Comparative Example 2, Comparative Example 3, and Comparative Example 4 used the same amount of glycerin divalmitate and hexaglyceryl dibalmitate in place of -hexaglyceryl tristearate in Example 2, Example 3, and Example 4, respectively. and lauric acid amide. Table 1 (Effects of the Invention) The present invention is as described above, and achieves the above-mentioned characteristics without impairing the performance that handwriting marked on a writing surface dries almost instantly and can be marked on any surface including ink-impermeable surfaces. As is clear from the test results of Examples and Comparative Examples, this method greatly improves the ability to prevent ink from drying at the tip of a marking pen, and is therefore effective in preventing blurring of handwriting.

Patent applicant: Mitsubishi Pencil Co., Ltd.

Claims (1)

[Claims] Colorant, resin, organic solvent with affinity for water, and the following general formula ▲ Numerical formula, chemical formula, table, etc. ▼ Represented by m + n = 5 m = 0 to 5 n = 0 to 5 An ink for marking pens containing at least hexaglyceryl tristearate.