JP2859023B2 - Aqueous ballpoint pen ink volatilization preventing composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink volatilization preventing composition for an aqueous ballpoint pen. More specifically, the present invention relates to an ink volatilization preventing composition for preventing the volatilization of an ink in an aqueous ballpoint pen that directly stores the ink in an ink storage tube and stabilizing the storage of the ink.

[0002]

2. Description of the Related Art Conventionally, in a ballpoint pen having an ink storage tube for directly storing ink, a backflow inhibitor is filled in an upper portion of the ink in the ink storage tube in order to prevent the backflow of the ink. For example, JP-A-57-153070 discloses a composition comprising dibenzylidene sorbitol and ethylene glycol, and JP-A-57-200472 dissolves an amino acid derivative in a nonvolatile organic liquid such as petrolatum. A gelled composition is disclosed.

Further, Japanese Patent Application Laid-Open No. 61-57673, 61-1
45269, 61-151289, 61-20018
7, 61-268786, 62-50379, 62-1
No. 48581, polybutene and silica, polyoxyethylene sorbitan monolaurate, glycerin dioleate, sorbitan monooleate, pentaerythritol stearate, polyethylene glycol diisostearate, N-oxyethylamine, polyoxyethylene hydrogenated castor oil And the like.

Generally, an ink backflow preventive in an ink storage tube needs to have a property of following the movement of ink. However, in the case of a water-based ballpoint pen, the ink consumption is about 0.1 g to 0.2 g per 100 m of writing, and the oil consumption of a similar oil-based ballpoint pen is 0.01 g to 0.04 g per 100 m. On the other hand, very much, and ink consumption is fast. When the ink consumption is high as described above, the ink backflow preventive member may appear to be not attached to the ink container at first glance, but actually, it adheres to the inner wall of the ink container in a film form and the ink of the water-based ballpoint pen is used. As consumption progresses, the amount of the ink backflow preventer remaining at the upper end of the ink decreases steadily. Due to such a problem, the conventional ink backflow preventer has a drawback that the ink must be filled in an amount as large as about 5 to 20% of the ink storage tube.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide an ink volatilization preventing composition for an aqueous ballpoint pen which does not have the drawbacks of the conventional ink backflow preventer. . That is, it is an object of the present invention to provide an aqueous ballpoint pen ink volatilization preventing composition which moves at the same speed as ink and adheres to the inner wall surface of an ink container in an extremely small amount, and which prevents volatilization of water or an organic solvent of the ink.

[0006]

The aqueous ballpoint pen ink volatilization preventive composition of the present invention is a composition to be filled on top of an aqueous ink having a viscosity of 10 ^{-3 to 2} Pasec (25 ° C.) in the ink container of the aqueous ballpoint pen. Wherein a gelling agent and a surfactant having a fluorine alkyl group are blended with the hardly volatile organic liquid or the non-volatile organic liquid.

[0007] The volatile organic liquid or the non-volatile organic liquid used in the composition of the present invention includes mineral oil, animal and vegetable oils, esters, high-boiling hydrocarbons, higher fatty acids, higher alcohols, low-molecular-weight polyolefins, and silicone oils. And so on. Specific examples include petrolatum, spindle oil, castor oil, olive oil, liquid paraffin, polybutene having an average molecular weight of 300 to 3,000, dimethyl silicone oil, methylphenyl silicone oil, amino-modified silicone oil, polyether-modified silicone oil, fatty acid-modified And silicone oil.

[0008] as a gelling agent of the present invention, particulate silica, magnesium stearate, calcium stearate, aluminum stearate, metal soap such as zinc stearate, bentonite, inorganic pigments such as carbon black, such as phthalocyanine blue Organic pigments and the like. Preferable examples include silica whose surface is hydrophobized, such as Aerosil R974, R972, and R976 manufactured by Nippon Aerosil Co., Ltd.

The surfactant having a fluorinated alkyl group in the composition of the present invention refers to a partially or wholly fluorinated alkyl group and a sulfonate, a carboxylate, a phosphate, a hydrophilic group, or a hydrophilic group. Compounds containing an oily group or esters thereof. Specifically, fluoroalkyl (C ₂ -C ₁₀ ) carboxylate, disodium N-perfluorooctanesulfonylglutamate, 3
- [fluoroalkyl ₍₆ -C ₁₁₎ oxy] -1-alkyl (C ₃ ~C ₄₎ sulfonate, sodium 3- [ω-
Fluoroalkanoyl (C ₆ ~C ₈₎ -N- ethylamino] -1-sodium sulfonate, N- [3-
(Perfluorooctanesulfonamido) propyl]
N, N-dimethyl -N- carboxymethylene ammonium betaine, fluoroalkyl (C ₁₁ ~C ₂₀₎ carboxylates, perfluoroalkyl carboxylates (C ₇ ~
C _13), perfluorooctane sulfonic acid diethanolamide, perfluoroalkyl (C ₄ -C ₁₂₎ sulfonate (Li, K, Na), N-propyl-N-(2-hydroxyethyl) perfluorooctane sulfonamide Perfluoroalkyl (C ₆ -C ₁₀ ) sulfonamidopropyl trimethyl ammonium salt, perfluoroalkyl (C ₆ -C ₁₀ ) -N-ethylsulfonylglycine salt (K), bis (N-perfluorooctylsulfonyl phosphate) Fluorinated surfactants such as N-ethylaminoethyl) and monoperfluoroalkyl (C ₆ -C ₁₀ ) ethyl phosphate can be mentioned. Also, Florad FC-431 (manufactured by Sumitomo 3M Limited), Unidyne DS-101 (manufactured by Daikin Industries, Ltd.), EFTO
Trade names such as PEF-801 (manufactured by Mitsubishi Materials Corporation). The amount of the surfactant having a fluorine alkyl group is 0.01 to 5% by weight, preferably 0.01 to 2%, based on the composition.

The composition of the present invention is prepared by adding a surfactant having a fluorine alkyl group and a gelling agent to one or a plurality of nonvolatile or hardly volatile solvents, and kneading the mixture with a kneader or a three-roll mill. , By gelation.

The ink to which the composition of the present invention can be applied is generally used for an aqueous ballpoint pen ink to be filled in an ink container, and has an ink viscosity of 10 ^{-3 to 2} Pasec (25 ° C.).

When the composition of the present invention is filled on top of the ink in the ink container of a ballpoint pen, a film much thinner than the conventional ink backflow preventer is formed at the interface between the ink container and the composition. As the ink flows with the ink, the composition remaining on the ink follows the ink in an amount that is almost the same as the initial amount. For this reason, the upper end of the ink in the ink container is cut off with the same thickness as that between the outside air and the ink, and has an effect of preventing the ink from volatilizing. In addition, the composition of the present invention can be used as an ink backflow preventer by adjusting pseudoplastic or plastic strength by the amount of a gelling agent and the like, and selecting a nonvolatile or hardly volatile solvent having an appropriate viscosity. Also, performance comparable to the conventional one can be obtained.

[0013]

Next, the present invention will be described in more detail by way of examples. The evaluation of the volatilization preventing compositions of Examples and Comparative Examples was performed as follows. A ball-point pen ink having the following composition was filled into an ink storage tube (transparent polypropylene tube having an inner diameter of 3 mm) for a length of about 100 mm. Water black 187L (trade name of Orient Chemical Co., Ltd.) 8 parts by weight Polyvinylpyrrolidone K-90 3 カ リ ウ ム Potassium oleate 1 に Ethylene glycol 30 〃Water 58 に The following examples and comparative examples are shown above the ink in this container tube. Fill the composition obtained in the above to a length of 5 mm, and add a phosphor bronze tip (the ball is cemented carbide tungsten carbide,
Using a pen with a diameter of 0.7 mm, spiral writing was performed 400 m at a speed of 5.5 m / min (writing load was 1 mm).
00gf). After writing, the length of the composition remaining above the ink from the outside of the ink storage tube was measured. In addition, the weights of the housing tube, the tip, the ink to be filled, the composition, and the pen are measured in advance, and the remaining amount of the ink is calculated based on the weight difference of the pen before and after writing. After being left in a constant humidity bath for 60 days, it was allowed to cool to room temperature, and the remaining amount of ink was calculated in the same manner to calculate the weight change rate. Further, the above-mentioned pen was assembled and left standing upright in a constant-humidity bath at 50 ° C. and 80% RH for one week, and then the presence or absence of backflow was observed. Table 1 shows the results of Examples and Comparative Examples.

Example 1 95 parts by weight of Nissan Polybutene 015N (trade name of Nippon Oil & Fats Co., Ltd.) Aerosil R972 (trade name of Nippon Aerosil Co., Ltd.) Was kneaded with a three-roll mill to obtain an ink volatilization preventing composition.

Example 2 97 parts by weight of Nissan Polybutene 5N (trade name of Nippon Yushi Co., Ltd.) Aerosil R972 (trade name of Nippon Aerosil Co., Ltd.) 3 ユ ニ Unidyne DS-101 (trade name of Daikin Industries, Ltd.) 0.1 〃 The above composition was kneaded with a three-roll mill to obtain an ink volatilization preventing composition.

Example 3 Polybutene HV-15 (trade name of Nippon Oil Co., Ltd.) 96 parts by weight Aerosil R974 (trade name of Nippon Aerosil Co., Ltd.) 4 {EFTOP EF-801 (trade name of Mitsubishi Materials Corporation) 1} The above composition was kneaded with a three-roll mill to obtain an ink volatilization preventing composition.

Comparative Example 1 95 parts by weight of Nissan Polybutene 015N Aerosil R972 5 {polyoxyethylene lauryl ether 1} The above compound was kneaded with a three-roll mill to obtain a comparative example of Example 1.

Comparative Example 2 97 parts by weight of Nissan polybutene 5N Aerosil 380 3 {glyceryldiolate 1} The above compound was kneaded with a three-roll mill to obtain a comparative example of Example 2.

Comparative Example 3 Polybutene HV-15 (trade name of Nippon Oil Co., Ltd.) 95 parts by weight Aerosil R974 (trade name of Nippon Aerosil Co., Ltd.) 4 {Sorbitan triolate 1} The above compound was kneaded with a three-roll mill. Then, a comparative example of Example 3 was obtained.

[0020]

[Table 1]

The composition of the comparative example, which corresponds to a conventional ink backflow preventer, adheres to the side of the ink storage tube at this filling amount, and does not remain at the upper end of the ink by writing 400 m. Was not at all. Therefore, the used ink was about half of the filled amount.
From the above results, the filling length of the composition of the comparative example needs to be 15 mm or more compared to 5 mm of the composition of the present invention.

[0022]

The composition for preventing volatilization of the ink of the ballpoint pen of the present invention moves together with the ink in the ink container of the ballpoint pen and adheres to the wall surface of the ink container as an extremely thin film. Since the ink volatilization preventing composition at the upper end of the storage tube can be maintained at substantially the same amount as the initial amount, the amount of the composition to be filled in the initial stage is significantly smaller than that of the conventional ink backflow preventer, and the volatilization prevention until the ink is exhausted. The effect can be kept. For this reason, it has become possible to fill a large amount of ink by about 5 to 15% as compared with a conventional water-based ball-point pen that directly stores ink in an ink storage tube. In addition, because of the property of being able to move together with the ink in the ink storage tube, the ink backflow prevention member has performance comparable to that of the conventional ink backflow prevention member.

Claims (1)

(57) [Claims] 1. A composition to be filled on top of an aqueous ink having a viscosity of 10 ^{-3 to 2} Pasec (25 ° C.) in an ink storage tube of an aqueous ball-point pen, comprising a gelling agent for a hardly volatile organic liquid or a nonvolatile organic liquid. An aqueous ballpoint pen ink volatilization-preventing composition, which comprises a surfactant and a surfactant having a fluorine alkyl group.