JPH0741721A - Ink composition for ball-point pen - Google Patents

Abstract

PURPOSE:To obtain an ink compsn. for a ball-point pen which hardly causes blurs at the first writing even after a long storage by compounding a polyoxyethylene alkyl ether actetic acid and/or its salt into the compsn. CONSTITUTION:The ink compsn. contains a colorant, a solvent, and a polyoxyethylene alkyl ether acetic acid and/or its salt pref. in amts. of 5-40wt.%, 35-75wt.%, and 0.5-10wt.% based on the compsn. respectively.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an ink composition used for a ballpoint pen. Specifically, the present invention relates to an ink composition for a ballpoint pen, which has less blur at the beginning of writing even after long-term storage, that is, so-called first-stroke blur.

[0002]

2. Description of the Related Art Heretofore, it has been known that an ink composition for a ballpoint pen contains a coloring material, a solvent such as glycols and fatty acids, and a resin. In the case of using fatty acid as a solvent, the handwriting has a poor drying property, so that there is a problem that the handwriting is liable to stain, strike through on the paper surface, and bleeding. Therefore, many solvents use glycols and the like. However, since solvents such as glycols have hygroscopicity, the dye or resin in the ink composition is deposited and the ink discharge amount from the pen tip is reduced to cause fading or an ionized dye. And oxygen in the air corrode the inside of the metal ball or the socket of the metal ball-point pen tip, reducing the ink discharge rate from the pen tip and causing blurring, or when writing is not possible, it becomes impossible to write. It was easy to cause the problem that Many proposals for solving this problem are known. For example, addition of ethylene oxide adduct of aliphatic amine (Japanese Patent Publication No.
9-27676), combined use of glycol solvent and fatty acid ester (Japanese Patent Publication No. 40-3378), addition of oleyl ether or ester of polyethylene glycols (Japanese Patent Laid-Open No. 55-54370), antioxidant and corrosion inhibitor. (Japanese Patent Publication No. 58-10436) and the like.

[0003]

However, despite the various proposals mentioned above, the quality of the ink composition for ballpoint pens has not been sufficiently satisfied. In particular, it is not satisfactory with regard to the fading of the writing due to the drying of the pen tip, that is, the fading of the first stroke.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a colorant, a solvent, polyoxyethylene alkyl ether acetic acid and / or
Alternatively, the gist of the invention is an ink composition for a ballpoint pen containing at least a salt thereof.

The details will be described below. As the coloring material, a dye or pigment conventionally used in ballpoint pen ink compositions can be used.

The dyes are C.I. I. Solvent Black 3, the same 7, the same 20, the same 24, the same 123, C.I.
I. Solvent Red 8, 49, C.I. I. Solvent Blue 2, 5, 25, 38, 55, 64, 70, C.I. I. Solvent Green 3, C.I. I. Solvent Yellow 21, the same 34, the same 47, the same 61, the same 82,
C. I. Solvent Orange 25, 37, C.I. I. Solvent Violet 8, the same 9, 21 and the like.

Further, CI Basic Blue 1, 1, 7
Ibid. 8, C.I. I. Basic Violet 3, C.I. I. A salt-forming dye of a basic dye such as Basic Red 1 and an acid dye selected from CI Acid Yellow 23 and CI Acid Yellow 23 can also be used.

The pigments are azo pigments, condensed polyazo pigments,
Phthalocyanine pigments, quinacridone pigments, indigo pigments, thioindigo pigments, nitroso pigments, nitro pigments, basic dye pigments, acid dye pigments, vat dye pigments, mordant dye pigments and natural dye pigments. And organic pigments such as ocher, barium yellow, navy blue, cadmium red, barium sulfate, titanium oxide, red iron oxide, iron black, carbon black, and other inorganic pigments.

These colorants can be used alone or in combination. The amount used is preferably 5 to 40% by weight based on the total amount of the ink composition for ballpoint pens.

Solvents include glycol solvents such as ethylene glycol, diethylene glycol, propylene glycol and hexylene glycol, fatty acids such as oleic acid,
Ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monohexyl ether, ethylene glycol monophenyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monohexyl ether, diethylene glycol monophenyl ether , Propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mononormal butyl ether, propylene glycol monophenyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol Cellosolve solvent such as coal mononormal butyl ether, dipropylene glycol monophenyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monoethyl ether, tripropylene glycol mononormal butyl ether, tripropylene glycol monophenyl ether, benzyl alcohol, α- Alcoholic solvents such as methylbenzyl alcohol, propylene glycol methyl ether acetate, propylene glycol diacetate and the like can be used.

These solvents can be used alone or as a mixture. The amount used is preferably 35 to 75% by weight with respect to the total amount of the ink composition for a ballpoint pen.

The polyoxyethylene alkyl ether acetic acid and / or its salt is used for preventing the blurring of writing on a ballpoint pen, that is, the blurring of so-called first stroke.
It is represented by the following general formula 1, wherein R is an alkyl group, n is the number of moles of oxyethylene, and X is hydrogen, ammonium or a metal such as sodium or potassium. Examples of the alkyl group include octyl, nonyl, decyl,
8 to 20 carbon atoms such as undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl
Those of are preferably used. Oxyethylene having a molar number of 1 to 20 is preferably used. As commercially available products, Nikkor ECT-3, ECT-7, ECT-3NEX, ECTD-3NEX, ECTD
-6NEX (above, Nikko Chemicals Co., Ltd. product) can be illustrated. The amount used is preferably 0.5 to 10% by weight with respect to the total amount of the ink composition for a ballpoint pen.

[0013]

Embedded image R—O— (CH ₂ CH ₂ O) n—CH ₂ COOX

In addition to the above-mentioned essential components, ketone-aldehyde resin, maleic acid resin, polyvinylpyrrolidone, polyvinyl alcohol, polyvinyl acetal, polyoxyethylene, epoxy for adjusting viscosity, accelerating dissolution, preventing strike-through and improving fixability. A resin, a resin such as polyamide, a lubricant such as molybdenum disulfide, an antiseptic agent, a fungicide, a rust preventive, a dispersant and the like may be appropriately selected and used.

For the preparation of the ink composition for the present ballpoint pen, a conventionally known method for producing an ink can be applied. That is, when a dye is used as a coloring material, an ink composition for a ballpoint pen can be obtained by dissolving each component with a stirring mixer, and when a pigment is used, the pigment is mixed with other components by a dispersion mixer. An ink composition for a ballpoint pen can be obtained by dispersing it together with the ink composition. During production, heating to dissolve solid matter such as dyestuff and use of a filter to remove coarse particles such as pigment are particularly preferable methods.

[0016]

The polyoxyethylene alkyl ether acetic acid and / or its salt contained in the ink composition for a ball-point pen according to the present invention has a polyoxyethylene alkyl ether portion which exhibits a lubricating effect to smooth the rotation of the ball, and
Acetic acid and / or its salt portion becomes a parent metal portion and exhibits a leveling effect. It is speculated that such peculiarity of the molecular shape reduces the blurring of the first stroke.

[0017]

EXAMPLES Examples and comparative examples will be shown below. Example 1 CI Solvent Black 7 30.0 parts by weight Ethylene glycol monophenyl ether 30.0 parts by weight Benzyl alcohol 10.0 parts by weight Polyoxyethylene (3; moles of oxyethylene added, the same applies hereinafter) tridecyl ether Sodium acetate 6.5 parts by weight Gum rosin 20.0 parts by weight Polyvinylpyrrolidone 2.0 parts by weight The above components were heated and stirred with a stirrer (80 ° C., 4 hours), and filtered under warm and pressure conditions to give a black ink composition for ballpoint pens. Obtained.

Example 2 CI Solvent Red 49 22.0 parts by weight CI Solvent Yellow 21 6.0 parts by weight Benzyl alcohol 30.0 parts by weight Propylene glycol 10.0 parts by weight Ethylene glycol monophenyl ether 10 0.0 parts by weight Polyoxyethylene (6) octyl ether sodium acetate 4.0 parts by weight Halon 110H (ketone resin, manufactured by Honshu Kagaku Co., Ltd.) 18.0 parts by weight The same components as in Example 1 were used for a ballpoint pen. A red ink composition was obtained.

Example 3 Carbon black 22.0 parts by weight Ethylene glycol monophenyl ether 44.0 parts by weight Benzyl alcohol 8.0 parts by weight Polyoxyethylene (12) dodecyl ether sodium acetate 2.0 parts by weight Polyvinyl alcohol 10.0 Parts by weight Halon 110H 14.0 parts by weight The above components were heated and stirred with a stirrer (100 ° C., 3 hours) and then kneaded with a three-roll mill to obtain a black ink composition for a ballpoint pen.

Example 4 CI Solvent Black 7 30.0 parts by weight C.I. I. Solvent Yellow 21 1.0 parts by weight Ethylene glycol monophenyl ether 30.0 parts by weight Benzyl alcohol 10.0 parts by weight Polyoxyethylene (3) octadecyl ether potassium acetate 6.5 parts by weight Gum rosin 20.0 parts by weight Polyvinylpyrrolidone 2. 0 parts by weight The above components were treated in the same manner as in Example 1 to obtain a black ink composition for a ballpoint pen.

Example 5 CI Solvent Blue 55 28.0 parts by weight Benzyl alcohol 30.0 parts by weight Propylene glycol 10.0 parts by weight Ethylene glycol monophenyl ether 10.0 parts by weight Polyoxyethylene (1) octyl ether Acetic acid 4.0 parts by weight Halon 110H 18.0 parts by weight The above components were treated in the same manner as in Example 1 to obtain a red ink composition for a ballpoint pen.

Example 6 Phthalocyanine blue 22.0 parts by weight Ethylene glycol monophenyl ether 44.0 parts by weight Benzyl alcohol 8.0 parts by weight Polyoxyethylene (6) dodecyl ether lithium acetate 2.0 parts by weight Halon 110H 14.0 Parts by weight Polyvinyl alcohol 10.0 parts by weight The above components were treated in the same manner as in Example 3 to obtain a black ink composition for a ballpoint pen.

Example 7 C. I. Basic Violet 3 and C.I. I. Salt forming dye with Acid Yellow 23 25.0 parts by weight C.I. I. Solvent Yellow 21 7.0 parts by weight Ethylene glycol monophenyl ether 39.0 parts by weight Benzyl alcohol 10.0 parts by weight Polyoxyethylene (20) octadecyl ether acetic acid 1.0 part by weight Halon 110H 13.0 parts by weight Polyvinylpyrrolidone 5. 0 parts by weight The above components were treated in the same manner as in Example 1 to obtain a black ink composition for a ballpoint pen.

Comparative Example 1 A black ink composition for a ballpoint pen was prepared in the same manner as in Example 1 except that polyoxyethylene (3) tridecyl ether sodium acetate was replaced by polyoxyethylene (4) dodecylamine. I got a thing.

Comparative Example 2 A red ink composition for a ballpoint pen was prepared in the same manner as in Example 2 except that polyoxyethylene (6) octyl ether sodium acetate was replaced with polyoxyethylene (6) dodecylamine. Got

Comparative Example 3 A black ink composition for a ballpoint pen was obtained in the same manner as in Example 3 except that castor oil was used in place of sodium polyoxyethylene (12) dodecyl ether acetate.

The ink composition obtained in each of Examples 1 to 7 and Comparative Examples 1 to 3 was subjected to the first stroke fading test. The results are shown in Table 1.

[0028]

[Table 1]

Preparation of Test Samples: Each of the ballpoint pen ink compositions obtained in Examples 1 to 7 and Comparative Examples 1 to 3 was a commercially available oil-based ballpoint pen (BK70, manufactured by Pentel Co., Ltd., and the pen tip was a stainless steel tip and A writing tool similar to that of hard alloy balls) was filled with 0.3 g to prepare a test sample.

First stroke blur test 1: Each test sample is left sideways in a constant temperature bath at a temperature of 50 ° C. and a humidity of 50%, one week later, handwriting is performed, and the blur length is measured with a ruler (unit: mm). .

First stroke blur test 2: Each test sample is left sideways in a constant temperature bath at a temperature of 50 ° C. and a humidity of 50%, and handwritten writing is performed after 3 months, and the blur length is measured with a ruler (unit: mm). .

[0032]

As described above in detail, the ink composition for a ball-point pen according to the present invention is excellent in that it has a smooth writing feeling and, even when it is stored for a long period of time, it hardly causes scratches on the first writing. Have the effect.

Claims (1)

[Claims] 1. An ink composition for a ballpoint pen, which contains at least a coloring material, a solvent, and polyoxyethylene alkyl ether acetic acid and / or a salt thereof.