JP2992841B2 - Alcohol-based marking ink composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-based ink composition for use in marking, and more particularly to an alcohol-based oil-based marking ink composition having excellent decapping properties with reduced evaporation.

[0002]

2. Description of the Related Art One of the properties which have been conventionally demanded for a marking ink is decapping. In other words, an ink that has the property of being able to write smoothly without penalty even when exposed to the air for a long time during storage or with the cap removed from the writing implement with a pen point is usually referred to as ink with excellent decapping properties. Have been done. Such characteristics are achieved by suppressing the volatilization rate (evaporation rate) of the ink.

A water-based ink containing an ethanolamine and / or an ethanolamine derivative obtained by adding ethylene oxide to a hydroxyl group has been conventionally used as an ink composition having a reduced evaporation rate (for example, Japanese Patent Publication No. 57-38628). An aqueous ink containing a glucose derivative to which ethylene oxide and / or propylene oxide has been added (for example, JP-A-59-59755), or a gluconic acid derivative having ethylene oxide added to a hydroxyl group. There are water-based inks and the like.

[0004] In each of these methods, the evaporation rate is suppressed by adding an ethylene oxide adduct, but all of them relate to aqueous inks and cannot always be applied to oil-based inks.

The present inventor has studied the use of an alcohol-based ink having excellent decapping properties by suppressing the evaporation rate of the marking oil-based ink, and as a result, completed the present invention. It is to provide an alcohol-based oil-based marking ink having a dissolving power and having a decapping property.

[0006]

Means for Solving the Problems The gist of the present invention is that of general formula (1) C
_{H 3 O (CH 2 CH 2} O) nH (n: 1 or more integer) represented by methanol - comprising a Le ethylene oxide adduct alcohol - le type oily Ma - a King ink composition.

That is, in the present invention, decapping properties can be obtained by using an ethylene oxide adduct of metal represented by the above general formula (1), and the number of moles added is in the range of 1 to 20. preferable.

The present invention will be described in detail. The dyes used in the present invention are oily dyes usually used in marking inks, and the metal-containing dyes are Vali Fast Black.
3806, Orazol Black RL, Vali Fast R as salt-forming dye
ed 1308, Blue1603, Yellow 1101, basic dyes such as Victoria Blue F4G and Methyl Visolet FN. Nigrosine-based products such as Nigrosylbase EX. May be.

The resin used is a resin normally used in ink compositions such as a natural rosin resin, a ketone resin and a phenol resin. The solvent is an alcohol-based organic solvent such as ethanol, n -Propanol, iso-propanol, butanol, benzyl alcohol, propylene glycol monomethyl ether (PGM), n-methyl-2-pyrrolidone and the like. Further, a fluorine-based activator may be added thereto.

Next, the present invention will be described more specifically with reference to examples. In addition, the compounding ratio in an Example shows a weight%.

[0011]

[Example 1] Ethanol 50.0% n-propanol 15.0% Rosin W 7.0% Vali Fast Red 1308 7.0% Fluorinated activator (FC-430) 0.3% 5 mol ethylene oxide added methanol 20.0% Each component was mixed and stirred at room temperature to obtain a red marking ink.

[0012]

[Comparative Example 1] Ethanol 70.7% n-propanol 15.0% Rosin W 7.0% Vali Fast Red 1308 7.0% Fluorinated activator (FC-430) 0.3% A method similar to that of Example 1 using the above components. And stirred to obtain a red marking ink.

When these inks were filled into a commercially available marking pen, the cap was removed and the ink was allowed to stand in the air. When the marking ink of the comparative example was blurred in about 2 hours, it could not be written smoothly. On the other hand, in the case of the example in which ethylene oxide-added methanol was added, blurring occurred in 6 hours, and satisfactory writing characteristics were obtained within 6 hours.

As described above, the present invention has the effect of suppressing the volatility of the ink and improving the decapping property by adding ethylene oxide-added methanol to the marking ink. ( that's all )

Claims (1)

(57) [Claims] 1. An alcohol-based oil-based polymer containing an ethylene oxide adduct of methanol represented by CH ₃ O (CH ₂ CH ₂ O) nH (n: an integer of 1 or more) (1). -King ink composition