JPH02218772A - Water-based ink for ball point pen - Google Patents

Abstract

PURPOSE:To obtain the title ink excellent in rust-proof effect for ball holder by incorporating an ink composition containing a colorant, organic solvent and a rust preventive such as benzotriazole with, as a second rust preventive, an organic acid salt of fatty acid amine (derivative). CONSTITUTION:The objective ink can be obtained by incorporating (A) an ink composition containing a colorant, organic solvent and a conventional rust preventive such as benzotriazole or methyltriazole with (B) as a second rust preventive, pref. 0.1-5.0wt.% of an organic acid salt of fatty acid amine (e.g. methylamine) (or its derivative).

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water-based ink for use in ballpoint pens, and particularly to enhance the rust-preventing effect of a ball holder holding a ball.

(Prior Art) Conventionally, copper-based metals such as brass and nickel silver have been used as ball holders for water-based ballpoint pens. In addition, benzotriazole, methyltriazole, ethylenecyalonetetraacetic acid, or triethanolamine is added as a rust preventive agent to the aqueous alkali ink composition using such copper-based metal ball holders. Ta.

(Problems to be Solved by the Invention) Recently, iron-based metals such as stainless steel have been increasingly used as ball holders for water-based ballpoint pens in consideration of workability and wear resistance. If a water-based ink containing the above-mentioned rust preventive agent is used on a ballpoint pen with a ball holder made of iron-based metal, the rust prevention effect on the ball holder will only last for a short period of time, and will last for a long time. When used, the ball holder corroded, impairing the rotation of the ball, causing problems such as blurring of the drawn line when writing began and poor writing quality.

Therefore, the present invention prevents corrosion of the ball holder even when used for a long period of time in a ballpoint pen equipped with a hole holder made of iron-based metal, and eliminates the disadvantages such as blurring of the drawn line and deterioration of the writing feel at the beginning of writing. The purpose is to provide a water-based ink for ballpoint pens that can be used.

(Means for Solving the Problems) In order to achieve the above object, the water-based ink in the present invention has the following features:
It is made by adding organic salts of fatty acid amines or derivatives thereof as a rust preventive agent to an ink composition containing a suitable colorant, an organic solvent, and a general rust preventive agent such as benzotriazole or methyltriazole. I'm here now.

The organic salts of fatty acid amines added as rust preventives include methylamine, ethylamine, methylamine,
Aliphatic primary amines such as hexylamine, cyclohexylamine, and ethanolamine; aliphatic secondary amines such as dimethylamine, diethylamine, dicyclohexylamine, and piperidine; and aliphatic amines such as trimethylamine, triethylamine, triamylamine, and triethanolamine. Organic acid salts such as nitrites, carbonates, and carboxylates such as tertiary amines can be used, and their derivatives include N-nitrone compounds such as Biclar) and N-thrombicrate. , N-benzoyl compounds, etc. can be used. The amount of these added in the ink composition is 0.01 to 5.0.
A range of 0% by weight is preferred. If the content is less than 1% by weight, the rust preventive effect will be poor, whereas if it exceeds the content by weight, the solubility of the rust preventive agent itself may become a problem or metal ions may be dissolved.

In addition, as a general anti-rust agent to be added together with the above-mentioned anti-rust agent, any known agent may be used, such as benzotriazole or methyltriazole. A range of 2.0% by weight is preferred.

The total amount of the above rust preventive added to the ink composition is 0.
A range of 0.05 to 5.0% by weight is effective.

In addition, the colorant to be included in the ink composition of the present invention includes:
It can be arbitrarily selected from water-soluble dyes such as acid dyes, direct dyes, and basic dyes.

Furthermore, since the ink composition of the present invention is a water-based ink, known non-drying water-soluble organic solvents such as ethylene glycol, diethylene glycol, propylene glycol, etc. are used for the purpose of preventing drying and imparting antifreeze properties.
Polyhydric alcohols such as glycerin, glycol ethers such as methyl cellosolve, butyl cellosolve,
Glycol esters such as ethylene glycol monomethyl ether acetate can be used, and these can be appropriately selected and used singly or in combination of two or more.The amount of organic solvent to be added is The amount may range from 5 to 40% by weight in the ink composition, but preferably from 15 to 301 L.

The ink composition of the present invention may further contain auxiliary agents commonly used in aqueous ink compositions, such as preservatives, antifungal agents, and pH adjusters, as required.

(Function) When a rust preventive agent such as an organic salt of a fatty acid amine or a derivative thereof is added together with a general rust preventive agent as in the present invention, these rust preventive agents form a film that is strong even on ferrous metals. This will enhance the rust prevention effect.

(Example) Next, the present invention will be explained in more detail using examples.

Example I C, L Ac1d Black 2
10.0 (wt%) ethylene glycol 2
5.0 Neugen pg - surfactant manufactured by Yakuhin Kogyo Mutual Co., Ltd.) 0.
2 Phenol 0.1 Methyltriazole 0.5N-nitrosobicrate
0.3 water
63.9 The above compositions were mixed, heated and stirred at 40 to 60°C for 3 hours, and then filtered to obtain a black ink.

Example 2 C,L Ac1d Red 52
8.0 (wt%) propylene glycol
2o, 0 Proxel GXL (antifungal agent) 0.1 Monoethanolamine benzoic acid 0.5 Methyltriazole 0.2 Water
71.2 The above composition was used to obtain the red ink of the above example.

Example C, 1, Ac1d B] n, e 90 Glycerin dodecahydrodiphenylamine benzotriazole sulfolane Phenol Water 8.0 (wt%) 20.0 0.5 0.8 5.0 0. 2 66.0 The above composition was treated in the same manner as in Example 1 to obtain a blue ink.

The inks of each of the above examples and the following comparative examples were put into a bottle with a lid, an iron rod (SK; JIS-G-4401, 1) was immersed therein, and the rust was left at 70°C for 5 days. In addition, a ballpoint pen using a stainless steel ball holder was filled with the inks of the above percentage examples and each comparative example and left at 50°C for 3 months, and then the rust occurrence on the ball holder was investigated. In addition to observation, a writing feel test was conducted using a 7-lead hand, and a writing test was also conducted using a rotating writing tester.The results are shown in Table 1.

Comparative Example 1: A black ink obtained by removing methyltriazole and N-nitrone bicrate from the composition of Example 1, adding water in the same amount, and treating in the same manner as in Example 1.

Comparative Example 2 Red ink obtained by removing monoethanolamine benzoic acid and methyl triazole from the composition of Example 2, adding water in the same amount, and treating in the same manner as in Example 2.

Table 1 Comparative example 3: From the composition of Example 3, dodecahydro and Diphenylamine and benzotria.

Remove the sol and add that amount of water. Blue color obtained by processing in the same manner as in Example 3 Nki.

(Effects of the Invention) The ink of the present invention has the above-mentioned properties, and it is also applicable to ball holders made of copper-based metals, as well as iron-based metals, as is clear from the test results in the above examples. As such, it has the effect of preventing rust from forming and maintaining a smooth writing feel and good writing performance even after long-term use.

permission Out wish Man Mitsubishi Pencil Co., Ltd.

Claims (1)

[Claims] A water-based ballpoint pen ink composition containing an appropriate colorant, an organic solvent, and a general rust preventive agent such as benzotriazole or methyltriazole, and further added with organic salts of fatty acid amines or derivatives thereof as a rust preventive agent. ink.