JPH0649405A - Water based fluorescent ink for ball point pens - Google Patents

Abstract

PURPOSE:To obtain a water-based ink which contains a fluorescent dye, a polyethylene glycol, a viscosity regulator and water with the dry solid content and viscosity adjusted, thus enabling easy confirmation of the residual amount of the ink, showing excellent writing function with no exudation from the pen top. CONSTITUTION:The ink contains (A) a fluorescent dye such as Basic red 1, (B) a polyethylene glycol as a coloring agent for component A (preferably in the solid state at room temperature, that is to say, 100 or more average molecular weigh), (C) a viscosity regulator such as PVA and (D) water as a major solvent where the solid content is 15 to 60wt.% on the dry basis and the viscosity is 50 to 2,000 centipoise. It is preferred that the amount of component A is 0.01 to 30wt.%, component B is 5 to 50wt.% based on the total amount of the ink.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent water-based ink for ballpoint pens. More specifically, the present invention relates to a fluorescent water-based ink for a ballpoint pen that does not bleed out from the pen tip with time when left standing.

[0002]

2. Description of the Related Art The applicant has proposed many inks for ballpoint pens having a viscosity of 50 to 2000 centipoise (hereinafter abbreviated as cps). For example, JP-A-62-12
7373, JP-A-62-127372, JP-A-62.
-27479 etc. This ink is an ink that combines the advantages of conventional oil-based ballpoint pen inks and water-based ballpoint pen inks. Therefore, this ink for ball-point pens makes it easy to check the remaining amount of ink, allows smooth writing without bleeding, and has a very excellent writing function, with its handwriting having no line cracks or vote and high saturation. And implements handwriting performance.

By the way, in recent years, the demands of consumers have become very diversified, and colors that have been generally used conventionally such as black, red and blue are also used for a writing instrument such as a ballpoint pen which mainly writes characters. Not only that, but the demand for vivid colors such as yellow and pink, and fluorescent colors is also very high.

As a writing instrument which can obtain a handwriting of fluorescent color,
There is known a type in which an aqueous ink using a fluorescent dye or a fluorescent pigment is filled in a writing instrument using a fiber bundle as a pen tip and the letters under the handwriting are not hidden even when applied.

[0005]

The ink oozes from the pen tip. When a fluorescent pigment is used as a coloring material to prepare an ink having a viscosity of 50 to 2000 cps,
Due to the influence of the thickener, the fluorescent pigment is likely to be poorly dispersed, and it is very difficult to obtain an ink that can be put to practical use. Therefore, a fluorescent dye will be used. However, when a fluorescent dye is used, even if the viscosity of the ink is adjusted to 50 to 2000 cps, the ink oozes out from the pen tip when left standing in a non-contact state, and remarkably, There is a problem that ink drops may drop from the ink.

In order to solve this problem, a method of suppressing the ink oozing by narrowing the clearance between the ball and the tip of the ballpoint pen tip can be considered. However, with this method, there are problems such as a decrease in the writing function such as fading when the writing angle is reduced, and a decrease in the ink ejection amount and the performance of the handwriting. was difficult.

An object of the present invention is that the remaining amount of ink can be easily confirmed, the ink can be written smoothly without bleeding, and the handwriting has no line cracks or vomit and is highly saturated. It is an object of the present invention to provide a fluorescent water-based ink for ball-point pens that does not cause ink bleeding from the pen tip while maintaining its function and handwriting performance.

[0008]

The present invention comprises a fluorescent dye,
A fluorescent aqueous ink for a ballpoint pen, which contains at least polyethylene glycol, a viscosity modifier, and water, has a dry solid content of 15 to 60% by weight and a viscosity of 50 to 2000 cps.

The details will be described below. The fluorescent dye is used as a coloring material. Color Index (abbreviated below) Basic Red 1, Same 2, Basic Orange 1
No. 4, No. 15 and Basic Violet 10, etc., and these can be used alone or in combination of two or more. The amount of these used is preferably 0.01 to 30% by weight based on the total amount of the fluorescent water-based ink for a ballpoint pen.

Polyethylene glycol is used as a color former for the above fluorescent dye. Although any molecular weight can be used, it is solid at room temperature (average molecular weight is 10
00 or more) is preferable. These may be used alone or in combination of two or more. The amount of these used is preferably 5 to 50% by weight based on the total amount of the fluorescent water-based ink for ballpoint pens.

The viscosity modifier is used to increase the viscosity of the ink to 50 to 20.
Used to adjust to 00 cps. Polymeric substances such as polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone, methyl vinyl ether-maleic anhydride copolymer, carboxymethyl cellulose, hydroxypropyl cellulose, hydrogenated castor oil, polycarboxylic acid amide, guar gum, gum arabic, gelatin, shellac and the like can be mentioned. . These may be used alone or in combination of two or more. The amount of these used varies greatly depending on the type of substance used, but it is used so that the viscosity of the ink is 50 to 2000 cps.

Water is used as the main solvent.

In the fluorescent water-based ink for this ballpoint pen,
The solid content at the time of drying means that about 10 g of the fluorescent water-based ink for this ballpoint pen is put in a petri dish having a diameter of 10 cm, and the temperature is 80 ° C.
It is left in a 30% dryer for 24 hours without a lid, left in a desiccator at room temperature for 40 minutes and cooled, then weighed within 2 minutes, and this weight is divided by the initial ink weight. . In order to prevent the ink from bleeding from the pen tip, it is necessary that the solid content of the ink when dried is 15 to 60% by weight. In the case of an ink having a solid content of less than 15% by weight when dried, ink bleeding from the pen tip cannot be eliminated. Further, when the solid content at the time of drying exceeds 60% by weight, scratches are likely to occur on the handwriting, and when it is remarkable,
Writing is disabled.

In the fluorescent water-based ink for this ballpoint pen,
For the viscosity, an E-type rotational viscometer (manufactured by TOKIMEC Co., Ltd.) is used, the measurement rotor is appropriately selected according to the viscosity of the target ink, and the rotation speed is 50 rpm at 25 ° C., and 5 minutes after the rotation is started. It is a value measured later. It is easy to check the remaining amount of ink, you can write smoothly without bleeding, and
Since the handwriting is a fluorescent water-based ink for ballpoint pens that has no line breaks or fluff and has high saturation, the viscosity of the ink is 50-
It must be 2000 cps. Viscosity is 50c
If it is lower than ps, bleeding of the ink from the pen tip occurs, and if it is higher than 2000 cps, smearing or bloating of the handwriting tends to occur, and the saturation of the handwriting decreases.

In addition to the above essential components, if necessary, antifungal agents such as sodium benzoate, sodium dehydroacetate, and 1,2-benzisothiazolin-3-one, rust inhibitors such as benzotriazole and ethylenediaminetetraacetic acid, and anionic agents. Additives such as water-soluble dyes can be used as various cationic, nonionic surfactants, silicone surfactants, fluorine surfactants and other complementary colorants.

The method for producing the water-based ink for the present ballpoint pen is as follows:
Each of the above components can be easily obtained by a conventionally known method using a known stirrer, such as heat-dissolving and mixing and stirring if necessary.

[0017]

When the ballpoint pen is left as it is, the solvent component of the ink evaporates from the tip of the ballpoint pen. As a result, the solid content of the ink pouring deposits in the gap between the ball and the tip to form a solid layer. This solid layer prevents ink bleeding from the pen tip. This fluorescent water-based ink for ballpoint pens uses a fluorescent dye as a coloring material and has a solid content of 15 to 6 when dried.
Since the amount is 0% by weight, it is presumed that the phenomenon that the ink oozes out from the pen tip can be prevented.

[0018]

【Example】

 Example 1 (Orange ink) Basic orange 14 1.4 parts by weight Basic red 1 0.4 parts by weight Polyethylene glycol (average molecular weight 1000) 20.0 parts by weight Jaguar HP60 (Gurgam, Sansho Co., Ltd.) 3 parts by weight Water 72.3 parts by weight Benzotriazole 0.1 parts by weight Proxel GXL (mold inhibitor, manufactured by ICI Japan Co., Ltd.) 0.5 parts by weight

Example 2 (purple ink) Basic Violet 10 1.0 parts by weight Polyethylene glycol (average molecular weight 1000) 20.0 parts by weight Polyethylene glycol (average molecular weight 400) 10.0 parts by weight Jaguar HP60 (previously described) 0.4 Parts by weight water 68.0 parts by weight benzotriazole 0.1 part by weight Proxel GXL (described above) 0.5 part by weight

Example 3 (red ink) Basic Red 2 2.0 parts by weight Polyethylene glycol (average molecular weight 3000) 17.0 parts by weight Jaguar HP60 (previously described) 0.3 parts by weight water 80.1 parts by weight benzotriazole 0.1. 1 part by weight Proxel GXL (described above) 0.5 parts by weight

Example 4 (purple ink) Basic Violet 10 0.5 parts by weight Polyethylene glycol (average molecular weight 400) 45.0 parts by weight Serogen 3H 0.3 parts by weight (Carboxymethyl cellulose sodium, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) ) Water 53.6 parts by weight Benzotriazole 0.1 parts by weight Proxel GXL (described above) 0.5 parts by weight

Example 5 (yellow ink) Basic Orange 14 1.0 part by weight Polyethylene glycol (average molecular weight 1000) 20.0 parts by weight Serogen 3H (previously described) 0.3 parts by weight water 78.1 parts by weight benzotriazole 0.1. 1 part by weight Proxel GXL (described above) 0.5 parts by weight

Example 6 (Pink Ink) Basic Red 1 0.5 parts by weight Polyethylene glycol (average molecular weight 1000) 25.0 parts by weight Jaguar HP60 (previously described) 0.5 parts by weight water 73.4 parts by weight benzotriazole 0 .1 part by weight Proxel GXL (described above) 0.5 part by weight

Example 7 (Orange Ink) Basic Orange 15 0.3 parts by weight Polyethylene glycol (average molecular weight 3000) 5.0 parts by weight Serogen 3H (previously described) 0.3 parts by weight Himmage H1000P 10.0 parts by weight ( Collagen protein hydrolyzate, Okamoto Dye Store Co., Ltd. Water 83.8 parts by weight Benzotriazole 0.1 parts by weight Proxel GXL (previously described) 0.5 parts by weight

Comparative Example 1 (Pink Ink) Basic Red 1 0.3 parts by weight Polyethylene glycol (average molecular weight 3000) 5.0 parts by weight Jaguar HP60 (previously described) 0.3 parts by weight water 93.8 parts by weight benzotriazole 0 .1 part by weight Proxel GXL (described above) 0.5 part by weight

Comparative Example 2 (yellow ink) Basic Orange 14 0.2 parts by weight Polyethylene glycol (average molecular weight 1000) 10.0 parts by weight Jaguar HP60 (previously described) 0.2 parts by weight water 89.0 parts by weight benzotriazole 0.1. 1 part by weight Proxel GXL (described above) 0.5 parts by weight

Comparative Example 3 (purple ink) Basic Violet 10 0.5 parts by weight Polyethylene glycol (average molecular weight 400) 12.0 parts by weight Serogen 3H (previously described) 0.5 parts by weight Water 86.8 parts by weight Benzotriazole 0. 1 part by weight Proxel GXL (described above) 0.5 parts by weight

Comparative Example 4 (Orange Ink) Basic Orange 15 0.4 parts by weight Polyethylene glycol (average molecular weight 1000) 12.0 parts by weight Serogen 3H (described above) 0.4 parts by weight Water 76.6 parts by weight Ethylene glycol 10 0.0 parts by weight Benzotriazole 0.1 parts by weight Proxel GXL (described above) 0.5 parts by weight

Comparative Example 5 (pink ink) Basic Red 1 0.4 parts by weight Polyethylene glycol (average molecular weight 800) 45.0 parts by weight Serogen 5A 15.0 parts by weight (sodium carboxymethyl cellulose, Dai-ichi Kogyo Seiyaku Co., Ltd.) Water) 38.9 parts by weight Benzotriazole 0.1 parts by weight Proxel GXL (previously described) 0.5 parts by weight

As described above, with respect to Examples 1 to 7 and Comparative Examples 1 to 5, the components were stirred and mixed to obtain fluorescent aqueous inks for ballpoint pens.

The viscosities of the fluorescent aqueous inks for ball-point pens obtained in Examples 1 to 7 and Comparative Examples 1 to 5 and the solid content when dried were measured. Further, 0.8 g of these inks were filled in a ball-point pen (Hybrid K105, manufactured by Pentel Co., Ltd.) and used as a test sample, and an ink blot test and a writing test were conducted. The results are shown in Table 1.

[0032]

[Table 1]

Ink dripping test: The above test sample was left for 1 hour at 25 ° C. and 65% humidity without cap, with the pen tip facing downward (non-contact), and the condition was observed. Evaluation: ◎: Ink hardly oozes out to the pen tip ○: Ink oozes out slightly to the pen tip △: Ink oozes out to the pen tip considerably ×: Ink droplets drop from the pen tip

Writing test: After the above ink drop test, each sample was spirally written. I observed the handwriting. The ink bleeding on the pen tip was wiped off before writing. Evaluation: ○: less than 1 circle of brush strokes x: 1 circle or more of brush strokes

[0035]

As described above in detail, the fluorescent water-based ink for ballpoint pens of the present invention makes it easy to check the amount of ink remaining, can be written smoothly without bleeding, and its handwriting is line cracking. In addition to exhibiting excellent writing function and handwriting performance, which is free from blemishes and high saturation, it is an excellent one that does not cause ink bleeding from the pen tip when used in a ballpoint pen.

Claims (1)

[Claims] 1. A fluorescent dye, polyethylene glycol, a viscosity modifier, and water are contained at least, and the solid content when dried is 15 to 60% by weight, and the viscosity is 50 to 2000 centipoise. Fluorescent water-based ink for ballpoint pens.