JPH11129674A - Ink back current preventing body for water-based ballpoint point pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink back current preventing body compsn. which can move while it clearly scrapes off an ink sticked on the inner wall of the ink storing pipe when it is used for a water-based ball point pen wherein the amt. of consumption of the ink is large. SOLUTION: An ink back current preventing body compsn. is an ink back current preventing body compsn. provided on the top part of an ink filled in an ink storing pipe for a water-based ballpoint pen and the ink back current preventing body compsn. is prepd. by using a hardly volatile org. liq. or a non- volatile org. liq. selected from hydrocarbons as a base material and incorporating a gelling agent and an amino-modified silicone oil therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink backflow preventive composition provided above an ink in an ink storage tube, and more particularly to an aqueous ballpoint pen using a pen tip which discharges a large amount of ink during writing. The present invention relates to an ink backflow preventive composition for an aqueous ballpoint pen, which has minimized the adhesion of ink to the inner wall of a tube.

[0002]

2. Description of the Related Art Oil-based inks conventionally used for ballpoint pens have very high viscosities of several thousand to 10,000 mPa · s. Therefore, when a ballpoint pen having a simple structure in which a ballpoint pen tip is attached to one end of a shaft cylinder, which is an ink storage tube, is filled with oily ink, if the inner diameter of the ink storage tube is 2.8 (mm) or less, ink leakage may occur. Although there is no fear, when the inner diameter exceeds 2.8 (mm),
There is a concern that ink leaks when a ball pen is subjected to impact or when placed in a high-temperature environment with the pen tip turned upward. Therefore, in order to prevent ink leakage, it is necessary to provide an ink backflow preventive composition composed of petrolatum, silicone grease, silicone oil, a mixture of liquid paraffin and petrolatum, etc. in the upper portion of the ink container.

[0003] In addition, even if the ink container tube has an inner diameter of 2.8 (mm) or less, when an aqueous ink is filled, an ink backflow preventive composition is required for the purpose of preventing evaporation and drying of the ink. . Vaseline, silicone grease, silicone oil, vaseline, silicone oil,
Polybutene, α-olefin oligomer, ethylene-α
-A gelling of a non-volatile organic liquid such as an olefin oligomer is known.

[0004]

A water-based ball-point pen with a large amount of ink discharged has ink attached to the inner wall of the ink storage tube,
The point is that the used up state of the ink becomes unclear. Since the tip of the oil-based ball-point pen has little clearance between the ball and the forehead, the ink ejection amount is small even when the ball diameter becomes large. On the other hand, the tip of the water-based ballpoint pen has a large clearance to give the handwriting a freshness, and the ink ejection amount at the time of writing 100 m is 0.25 g.
In some cases, the ink ejection amount is about 10 times as large as that of the oil-based ballpoint pen. In addition, among the aqueous inks, those having a large particle diameter, for example, when using an aqueous ink containing aluminum powder for producing metallic luster, it is necessary to further increase the clearance, and therefore the ink ejection amount is very large. More. As described above, when the ink discharge amount is large, the speed at which the ink backflow preventive composition moves following the ink naturally increases. By the way, the ink backflow preventive composition is required to have a function of promptly responding to the consumption of ink and to reliably scrape off the ink attached to the inner wall of the ink storage tube. If it is fast, it is difficult to mix with water-based ink and oil-based ink backflow prevention composition,
The effect of scraping the ink is not in time. As a result, there is a problem that the ink adheres to the inner wall of the ink storage tube, and the used-up state of the ink becomes unclear.

An object of the present invention is to provide an ink backflow preventive composition which can be used in an aqueous ballpoint pen which consumes a large amount of ink and which can move while neatly scraping off the ink adhering to the inner wall of the ink storage tube.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an ink backflow preventing composition provided on top of ink filled in an ink container for an aqueous ballpoint pen, wherein the ink backflow preventing composition is carbonized. An ink backflow preventive composition for an aqueous ball-point pen, comprising a base material made of a hardly volatile organic liquid or a non-volatile organic liquid selected from hydrogens, and a gelling agent and an amino-modified silicone oil added thereto. The thing is the gist

Hereinafter, the present invention will be described in detail. The non-volatile organic liquid or non-volatile liquid selected from hydrocarbons as the base material used in the present invention includes liquid polybutene, liquid paraffin, spindle oil, petrolatum, α-olefin oligomer, ethylene-α-olefin Oligomer, silicon grease and the like can be mentioned, and these can be used alone or in combination of two or more.

The gelling agent used in the present invention includes fine particle silica such as Aerosil (manufactured by Nippon Aeosil Co., Ltd.) and hydrogenated castor oil such as Dispalon 305 (hydrogenated castor oil, Kusumoto Kasei Co., Ltd.). , Cellulose-based substances such as solooid (quaternary ammonium salt of cellulose sulfate ester, manufactured by Sanseki Co., Ltd.), dextrin-based substances such as leopard (dextrin, manufactured by Chiba Flour Milling Co., Ltd.), and metal soaps , Bentonite and the like. In particular, as the gelling agent, for example, if a fine particle silica powder having a primary particle diameter of several μm to 50 μm is used, the ink backflow preventing composition can be rendered transparent and the ink container itself can be transparent. Good appearance can be obtained. The mixing ratio of these gelling agents is preferably 1 to 10% by weight based on the total amount of the ink backflow preventing composition. When the content is 1% by weight or less, the gelling strength of the ink backflow preventing composition becomes weak, and the ink easily flows back. When the content is 10% by weight or more, the gelling strength is too strong, and Followability tends to be poor.

The amino-modified silicone oil is used to effectively scrape the ink adhering to the inner wall of the ink storage tube even when a continuous writing or a pen tip with a large ink discharge amount is used, and to clarify the used-up state of the ink. The compounds having the structures of Chemical Formulas 1 and 2 can be given as an example. Specific commercial products include TSF470
0, 4701, 4702, 4703, 470
4, 4705 and 4706 (all manufactured by Toshiba Silicon Co., Ltd.), and these amino-modified silicone oils can be used alone or in combination of two or more. This amino-modified silicone oil is used in an amount of 0.05 to 0.05 with respect to the total amount of the ink backflow preventive composition for aqueous ballpoint pens.
It is used in a range of 5.0% by weight, preferably 0.1 to 2.0% by weight. If the amount is less than 0.05% by weight, the effect may be insufficient. If the content is more than 5.0% by weight, if the pen tip is left facing upward for a long period of time, it may separate from the base material and rise upward.

[0010]

Embedded image (R and R 'represent an alkyl group.)

[0011]

Embedded image (A is CH_ThreeOr OR ′, wherein R and R ′ are
Represents a kill group. )

In preparing the ink backflow preventive composition for aqueous ballpoint pens of the present invention, various methods known in the art can be employed. For example, when a dextrin-based gelling agent is used, it is heated and stirred and mixed (140 ° C.) with other components by a stirrer. When Aerosil is used as a gelling agent, a kneader or a roll mill is used. It can be easily obtained by mixing and grinding with other components using a dispersing machine such as

[0013]

The effect of using the ink backflow preventive composition for an aqueous ballpoint pen according to the present invention is that the ink is prevented from adhering to the inner wall of the ink storage tube even during continuous writing or at the time of writing with a pen tip having a large amount of discharged ink. Is inferred as follows. Generally, a polar ink such as a water-based ink is repelled and hardly adheres to an ink storage tube formed of a non-polar material such as a non-polar polypropylene. However, the ink of the type that is directly filled in the ink storage tube is hard to be repelled because of its high viscosity, and thus easily adheres to the inner wall of the ink storage tube. When the ink discharge amount increases, the speed at which the ink storage tube repels ink cannot keep up, and the tendency of the ink to adhere to the ink storage tube becomes more remarkable. In addition, since the base material of the ink backflow preventive is basically non-polar and easily repels the aqueous ink, the effect of scraping the attached ink is small. In the amino-modified silicone oil used for the ink backflow preventive for water-based ballpoint pens of the present invention, the amino groups in the side chains are easily compatible with water, so the ink attached to the ink storage tube is scraped off by the ink backflow preventive for water-based ballpoint pens. In addition, the ink backflow preventive for water-based ballpoint pens is hardly adhered to the ink storage tube due to the amino-modified silicone oil skeleton silicone used, and therefore has a small amount of loss. Perform the function more than enough.

[0014]

The present invention will be described below in more detail with reference to examples. Example 1 Mobil SHF1003 (base material, α-olefin oligomer, manufactured by Mobil Sekiyu KK) 50.0 parts by weight Lucant HC-100 (base material, ethylene-α-olefin oligomer, manufactured by Mitsui Petrochemical Co., Ltd.) 44 0.8 parts by weight Aerosil R972 (gelling agent, silica, manufactured by Nippon Aerosil Co., Ltd.) 3.0 parts by weight Leopard KL (gelling agent, dextrin palmitic acid ester, manufactured by Chiba Flour Milling Co., Ltd.) 1.2 parts by weight TSF4702 (Amino-modified silicone oil, manufactured by Toshiba Silicon Co., Ltd.) 1.0 part by weight Each of the above components was placed in a kneader, and stirred for 2 to 3 hours.
An aqueous ballpoint pen ink reflux composition was obtained.

Example 2 Polybutene HV-15 (base material, polybutene, manufactured by Nippon Oil Co., Ltd.) 50.0 parts by weight Lucant HC-40 (base material, ethylene-α-olefin oligomer, Mitsui Oil Chemical Co., Ltd.) 43.3 parts by weight Aerosil R972 (described above) 4.0 parts by weight Leopard KE (gelling agent, dextrin palmitate, Chiba Milling Co., Ltd.) 1.5 parts by weight TSF4704 (amino-modified silicone oil, Toshiba Silicon) 1.2 parts by weight The above components were placed in a kneader and stirred for 2 to 3 hours.
An aqueous ballpoint pen ink reflux composition was obtained.

Example 3 Mobil SHF1003 (described above) 25.0 parts by weight Polybutene HV-15 (described above) 25.0 parts by weight Lucant HC-40 (described above) 44.7 parts by weight Aerosil R972 (described above) 3.0 parts by weight Leopard KL (described above) 1.3 parts by weight TSF4705 (described above) 1.0 part by weight The above-mentioned components were put into a kneader, and the mixture was stirred for 2 to 3 hours.
An aqueous ballpoint pen ink reflux composition was obtained.

Example 4 Mobil SHF1001 (described above) 44.0 parts by weight Lucant HC-100 (described above) 50.0 parts by weight Dispalon 305 (gelling agent, hydrogenated castor oil, manufactured by Kusumoto Kasei Co., Ltd.) 5.0 parts by weight Part TSF4700 (described above) 1.0 part by weight Each of the above components was placed in a kneader, and stirred for 2 to 3 hours.
An ink inverse composition for aqueous ballpoint pens was obtained.

Example 5 An ink backflow preventive composition for a ballpoint pen was obtained in the same manner as in Example 1, except that TSF4702 was increased to 6.0 parts by weight and SHF1003 was reduced accordingly.

Comparative Example 1 An ink backflow preventive composition for a ballpoint pen was obtained in the same manner as in Example 1 except that TSF4702 was omitted and that the amount of Mobil SHF1003 was increased accordingly.

A composition described later is placed in an ink container (material: polypropylene, inner diameter 3.2 mm) having a ballpoint pen tip made up of a ball (material: tungsten carbide) having a diameter of 0.8 mm and a stainless steel holder at one end. And 0.8 g of an aqueous metallic glossy ink having a viscosity of 2300 cps, and the upper part of the ink (the side opposite to the ballpoint pen tip) is an ink backflow preventive composition for aqueous ballpoint pens obtained in Examples 1 to 5 and Comparative Example 1. Each was filled with 0.1 g, centrifuged and defoamed to prepare a test ballpoint pen replacement core. Using this test ballpoint pen refill, a writing load of 10
A spiral writing test was performed under the conditions of 0 g, a writing angle of 70 °, and a writing speed of 7 cm / sec, and the ink used-up state was visually checked. The appearance was confirmed after one month in a 50 ° C. constant temperature bath. The results are shown in Tables 1 and 2.

[0021]

[Table 1]

[0022]

[Table 2]

[Composition of water-based ink] Aluminum paste (WXM0630, manufactured by Toyo Aluminum Co., Ltd., aluminum powder content: 60% by weight) 5.0 parts by weight Water-dispersed pigment (EM YELLOW FX3024, manufactured by Toyo Ink Co., Ltd., pigment) Solid content 28% by weight) 20.0 parts by weight Styrene-acrylic copolymer emulsion (fixing agent, Joncryl J-775, manufactured by Johnson Polymer Co., Ltd.) 0.5 part by weight Thickener (Xanthan gum) 1.0 Parts by weight ethylene glycol 10.0 parts by weight glycerin 10.0 parts by weight preservative (Proxel GXL, 1,2-benzisothiazolin-3-one manufactured by ICI Japan) 0.2 parts by weight water 53.3 parts by weight

[0024]

As described above in detail, the backflow preventive composition for an aqueous ballpoint pen according to the present invention can be used for an aqueous ink ballpoint pen which discharges a large amount of ink. Is very useful because it has the property that it can be effectively written down.

Claims (1)

[Claims] 1. An ink backflow preventive composition provided on top of an ink filled in an ink storage tube for an aqueous ballpoint pen, wherein the ink backflow preventive composition is hardly volatile selected from hydrocarbons. A water-based ink composition for ballpoint pens, comprising a base material made of a volatile organic liquid or a non-volatile organic liquid, and a gelling agent and an amino-modified silicone oil added thereto.