JPH0841406A - Ink composition for oily ball point pent - Google Patents

Abstract

PURPOSE:To provide an ink composition for oily ball point pen, composed of an organic solvent, a colorant, a resin and a specified lubricant, making it possible to write smoothly and excellent in beginning of writing and shelf life. CONSTITUTION:This ink composition for oily ball point pen is composed of (A) one or plural organic solvents such as a glycol and a cellosolve, (B) a colorant such as a gold-containing dye and a basic dye, (C) a resin such as a ketone resin or a rosin-modified resin and (D) preferably 0.1 to 10.0wt.% (based on the whole composition) carboxyl-modified silicone oil represented by formula I or II [(m) is number of added dimethylsiloxane; (n) is number of added carboxymethylsiloxane] as a lubricant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-based ballpoint pen ink composition which is excellent in initial writing properties, has a smooth writing feel even during writing, and is also excellent in storability.

[0002]

2. Description of the Related Art Conventional oil-based ballpoint pen ink compositions are
It contains a colorant, an organic solvent, a resin, etc., and oleic acid is often blended as a lubricant and a cosolvent in order to obtain a smoother writing feel.

[0003]

However, by blending oleic acid, copper and copper alloys used in some ballpoint pen tips are corroded, and the handwriting at the time of the first writing is blurred, and at the same time, It deteriorates storage stability.

[0004]

The oil-based ballpoint pen ink composition according to the present invention was studied variously in order to solve the above-mentioned problems, and as a result, instead of oleic acid conventionally used as a lubricant, for example, the following chemical formula was used. 1 and a carboxyl-modified silicone oil represented by Chemical Formula 2 [Chemical Formula 1: X-22-162A (trade name), Chemical Formula 2: X
It was found that the above-mentioned problems can be solved by using [22-3710E (trade name)] and completed the present invention.

[0005]

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[0006]

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(M and n are positive integers, m is the number of moles of dimethylsiloxane added, and n is the number of moles of carboxylmethylsiloxane added.)

The amount of the carboxyl-modified silicone oil used in the oil-based ballpoint pen ink composition of the present invention is preferably 0.1 to 10.0% by weight based on the total amount of the composition. If less than 0.1%, the expected effect cannot be obtained, and 10
If it exceeds%, the performance as an oil-based ballpoint pen ink may be impaired. As the colorant used in the present invention, all dyes and / or pigments such as metal-containing dyes, basic dyes and nigrosine dyes used in conventional ballpoint pen inks can be used. Examples of the organic solvent used in the present invention include solvents conventionally used in ballpoint pen inks, such as benzyl alcohol, glycols and cellosolves. Examples of the resin used in the present invention include resins conventionally used in ballpoint pen inks, such as ketone resins, rosin-modified resins, sulfamide resins, malein resins, ester gums, xylene resins, alkyd resins, phenol resins, polyvinylpyrrolidone resins and the like. Can be used.

[0009]

The writing quality of the ballpoint pen is determined by the magnitude of the friction between the ball and the ball seat, and it is considered that the blurring during writing is caused by the drying of the contact surface between the ball and the ball seat. Therefore, the carboxyl-modified silicone oil used in the present invention is added to the oil-based ballpoint pen ink to prevent the solvent component in the ink from volatilizing due to the intermolecular attractive force, allowing the ink to exist on the contact surface between the ball and the ball seat, and writing At the same time, the ink can be discharged smoothly, and at the same time, a smooth writing feeling can be obtained by the lubricating action of the carboxyl-modified silicone oil itself. Further, the ink composition of the present invention does not corrode the copper or copper alloy used in the ballpoint pen tip.

[0010]

EXAMPLES Hereinafter, the oil-based ballpoint pen ink composition according to the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto. Example-1 Varifast Black # 1805 (manufactured by Orient Chemical Industry Co., Ltd.) 15% by weight Varifast Yellow # 1105 (manufactured by Orient Chemical Industry Co., Ltd.) 5% by weight Spinon Violet CRH (manufactured by Hodogaya Chemical Co., Ltd.) 10% by weight 2-phenoxyethanol 40 wt% benzyl alcohol 5 wt% Hirac # 111 (manufactured by Hitachi Chemical Co., Ltd.) 18 wt% PVP K-90 (manufactured by BASF) 5 wt% Carboxyl-modified silicone oil (X-22-162A manufactured by Shin-Etsu Chemical Co., Ltd.) 2 % By weight Example-2 Varifast Black # 1802 (manufactured by Orient Chemical Industry Co., Ltd.) 15% by weight Spiron Yellow CGH (manufactured by Hodogaya Chemical Co., Ltd.) 5% by weight Varifast Violet # 1701 (manufactured by Orient Chemical Industry Co., Ltd.) 10% by weight 2 -Phenoxyethanol 40 Amount% Benzyl alcohol 5% by weight Hirac # 111 (manufactured by Hitachi Chemical Co., Ltd.) 18% by weight PVP K-90 (manufactured by BASF) 5% by weight Carboxyl-modified silicone oil (X-22-3710E manufactured by Shin-Etsu Chemical Co., Ltd.) 2% by weight %

Next, instead of the carboxyl-modified silicone oil of each Example, those containing oleic acid were subjected to the following tests as Comparative Examples 1 and 2 together with the Examples.

The above-mentioned oil-based ballpoint pen ink composition was prepared and polypropylene pipe and nickel-white tip (diameter 0.7
(mm cemented carbide ball) was filled, and the length of the scraping at the time of writing was measured by the following method, and the storage stability was confirmed, and the results are shown in Table 1. Length of scraping when writing; 10m writing, room temperature 2
After standing for 4 hours, writing was performed using a writing tester manufactured by Seiki Kogyo Co., Ltd. under the conditions of a load of 200 gf and a writing speed of 4 m / s, and the length of a scrape until a normal writing line was measured. Storability: First writing performance after storage at 50 ° C for 3 months

[0013]

As shown in Table 1, the oil-based ballpoint pen ink composition according to the present invention contains carboxyl-modified silicone oil so that the ink can be ejected smoothly at the time of writing and exhibits a smooth writing feeling. The storage performance was also extremely excellent.

Claims (1)

[Claims] 1. An oil-based ballpoint pen ink composition comprising one or more organic solvents, a colorant, a resin and a lubricant, wherein a carboxyl-modified silicone oil is used as the lubricant.