JPS6028471A - Aqueous ink composition - Google Patents

Abstract

PURPOSE:To obtain titled composition with high storage stability, non-volatility and wettability, suitable as ink for ball point pen, by incorporating an aqueous solution of water-soluble dye with pyrazole or imidazole each having pyrazolone ring. CONSTITUTION:The objective composition can be obtained by incorporating (A) an aqueous solution of water-soluble dye with (B) pyrazole or imidazole each having pyrazolone ring, which is expressed by formula I or II, respectively, in an amount, preferably, of 1-20wt%. Said aqueous solution can be prepared, for example, by incorporating an aqueous medium with (1) 5-20wt% of water-soluble polyhydric alcohol such as propylene glycol, (2) water-soluble dye, and, if required, (3) anti-fungus agent, surfactant, water-soluble resin, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aqueous ink composition, and more particularly to an aqueous ink composition having improved properties such as improved storage stability, non-evaporation properties, and high wettability.

The water-based ink used in ballpoint pens has a long shelf life that maintains stable performance even after a long period of time, and a non-evaporation property that prevents the ink around the pen body from evaporating when left on a desk. It is highly praised for its multifaceted performance, including its high brittleness and ability to prevent handwriting from coming off. A number of water-based inks have been proposed in the past that have improved their individual properties, but if you look at them comprehensively, all of them can be said to be worth ten points.

Therefore, the present invention provides a water-based ink with comprehensive performance such as preservability, non-evaporation, and high ah property by adding a pyrazole-straddling imitazole having a pyrazolone ring to an aqueous solution of a water-soluble dye. It is something to do.

The structure of the water-based ink of the present invention will be explained below.

The water-based ink of the present invention is made by adding and containing pyrazole or imidazole in an appropriate amount to the water-based ink components conventionally used as ballpoint pen inks, and generally contains ethylene glycol, propylene, etc. Water-based solvents such as glycol solvents such as Dalicol and diethylene dalycol, selonlube solvents such as ethylselonlube and methylselonlube, ethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate 7, and other glycol ether ester solvents. Water-soluble dyes such as direct dyes, basic dyes, and acid dyes are added to an aqueous medium in which about 5 to 20% by weight of polyhydric alcohols alone or in a mixture are added, and if necessary, a water-soluble dye is added. The above-mentioned pyrazole or imidazole is added and contained in an aqueous ink composition containing a fungicide, an anionic or nonionic surfactant, a water-soluble resin, etc. in an amount of 1 to 20 parts by weight. This pyrazole and each, Z,...
1), but if the amount added is less than 1@t%, sufficient effects on storage stability and non-evaporation, which are the objectives of the present invention, cannot be obtained; on the other hand, even if the amount exceeds 20%, Performance is not improved any further and it is useless.

Let's explain based on an example.

Example I Water 13'lue 9 30g (Orient Kagaku-1t dye) Water 1ol 4120g Ethylene glycol I-lue x5omi Ftergent +250 17' (Activator manufactured by Ones) Pyrazole 100mJ Add water to the above composition The mixture was heated at 60° C. for 1 hour, cooled once, and then leaked to obtain a water-based ink.

Example 2 Water Blaok Su187 300MWat,
or BlaQk +z1100 gglobylene glycol 15ON phthalate 2501 pupyrazole 75g Water was added to the above composition to make 1t, and a water-based ink was obtained in the same manner.

Example 3 Water Red 42 40g Water pink 4H20g Water Yellow 4110g Ethylene glycol 150d Phthaldient +2501wLl Imidazole 100d Water was added to the above composition to make 1 t, and a water-based ink was obtained in the same manner.

Example 4 Water Blak 1B7 300mWater
13Lak 21. 100g Globylene Glycol 150d Ftardient ÷250 1m Imidazole 75m1! Water was added to the above composition and a water-based ink was obtained in the same manner as 1t and L1.

Comparative Example The composition of Example 1 except that pyrazole was removed was used as the aqueous ink of Comparative Example.

The following tests were conducted on the water-based inks of Examples 1 to 4 and Comparative Examples.

(1) In the preservability acceleration test, it was filled in a bowl and written down, but the comparative example was 1.5
Although the handwriting became blurred after t months, perfect handwriting could be obtained in all Examples even after passing through the mountain pass for 3 t months.

(2) 18IiE test on oil-based paper When writing was done on a slightly oily paper surface with a surface tension of about 10 to 2 ocp, Comparative Example i repelled and could not be written sufficiently. does not occur,
I was able to obtain complete handwriting.

(3) Writing test on non-elastic paper When I placed a thin piece of paper on the glass surface and wrote on it, ■
In example T, the west mark was interrupted, but in the example, a complete mark was obtained without any interruption in the iswa.

(4) Evaporation test A hole pen was left on a desk without a cap, and the Ifr was written for a certain period of time. ; Although it became non-RFij,
In the example, it was also possible to record the results with 6 left bamboos.

As explained above, the present invention contains pyrazole and imidazole in an aqueous solution of a water-soluble dye, thereby providing a water-based ink with excellent storage properties and non-IA properties. I can do it.

Applicant: Sailor Manjushin Co., Ltd. Agent Patent Attorney 1) Toranosuke Hara

Claims (1)

[Claims] A water-based ink composition characterized in that a pyrazole or imidazole having a pyrazolone ring is added to an aqueous solution of a water-soluble dye.