JPH1036745A - Oil-based ink composition for ballpoint pens - Google Patents

Abstract

(57) [Problem] To obtain an oil-based ink composition for ballpoint pens with little blurring even after long-term storage. SOLUTION: 10 to 45% by weight of a coloring material such as a dye or a pigment, and 35 to 80% by weight of a solvent such as a glycol solvent, a glycol ether solvent or an alcohol solvent.
N-Alkyloylmethyltaurine sodium 0.5-3
An oil-based ink composition for a ball-point pen comprising at least% by weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an oil-based ink composition used for a ball-point pen. More specifically, the present invention relates to an oil-based ink composition for a ballpoint pen, which is less likely to be blurred at the start of writing even after storage for a long period of time, that is, so-called first brush.

[0002]

2. Description of the Related Art Conventionally, an oil-based ink composition for a ballpoint pen has been prepared by adding a colorant such as a dye or a pigment, a solvent such as a glycol or a high-boiling alcohol, a ketone resin, a xylene resin, or the like.
It is composed of a resin mainly for fixing on paper, such as a rosin-derived resin, and a resin mainly for adjusting viscosity and flow characteristics, such as polyvinylpyrrolidone and polyvinyl butyral, if necessary. In the case where glycols are used as a solvent, dyes and resins in the ink composition are precipitated because the glycols have a hygroscopic property. In addition, the ionized dye and oxygen in the air corrode the inside of the socket of the ball or ball-point pen tip, reducing the amount of ink discharged from the pen tip, resulting in writing faintness. Or the problem of becoming apt to occur. Many proposals for solving this problem are known. For example, the addition of an ethylene oxide adduct of an aliphatic amine (JP-B-39-27676) and the combined use of a glycol solvent and a fatty acid ester (JP-B-40-337)
No. 8), addition of oleyl ether or ester of polyethylene glycols (JP-A-55-54370), and combination use of an antioxidant and a corrosion inhibitor (JP-B-58-10436).
No.).

[0003]

However, in spite of the various proposals mentioned above, the quality of the ink composition for ballpoint pens has not been sufficiently satisfied. In particular, the first brush after storage for a long time was extremely insufficient.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is to provide an oil-based ink composition for a ball-point pen containing at least a coloring material, a solvent, a resin, and sodium N-alkyloylmethyltaurine.

The details will be described below. As the coloring material, oil-soluble dyes conventionally used in oil-based ink compositions for ballpoint pens are mainly used, but pigments for toning and improving handwriting characteristics can also be used in combination.

Examples of oil-soluble dyes include Rhodamine B base (CI. 45170B, manufactured by Taoka Dyestuff Manufacturing Co., Ltd.), Soldan Red 3R (CI. 21260, manufactured by Chugai Kasei Co., Ltd.), and methyl violet 2B base ( C.I.
42535B, National Anilin, USA
e Div. Manufactured by Victoria Blue F4R (CI.
42563B), nigrosine-based LK (CI.50)
415) (above, manufactured by BASF, Germany), Balifast Yellow # 3104 (CI. 13900A), Balifast Yellow # 3105 (CI. 18690),
Orient Spirit Black AB (CI.5041)
5), Bali Fast Black # 3804 (CI.1)
2195), Balifast Yellow # 1109, Balifast Orange # 2210, Balifast Red # 1320, Balifast Blue # 1605, Balifast Violet # 1701 (all manufactured by Orient Chemical Co., Ltd.), Spiron Black GMH Special, Spiron Yellow C-2GH, Spiron Yellow C
-GNH, Spiron Red C-GH, Spiron Red C
-BH, Spiron Blue BPNH, Spiron Blue C-
RH, Spiron Violet C-RH, S.R. P. T. Orange 6, S.I. P. T. Blue 111 (above, manufactured by Hodogaya Chemical Industry Co., Ltd.) and the like.

As the pigments, PRINTEX 95, 7
5, 45, P, XE2, (manufactured by Degussa Japan KK), # 2400B, # 1000, # MCF8
8, MA100, MA7, MA11, # 50, # 40,
# 30, CF9, # 20B (Mitsubishi Kasei Kogyo Co., Ltd.), RAVEN7000, 2000, 12
Carbon blacks such as 00, 1000, 500, 410, and 14 (all manufactured by Columbia Carbon Japan Co., Ltd.), titanium oxides such as P25 (manufactured by Nippon Aerosil Co., Ltd.), black iron oxide, and yellow iron oxide , Red iron oxide, ultramarine,
Inorganic pigments such as cobalt blue, chrome green, and chromium oxide, Hansa Yellow 10G, 5G, 3G, and 4,
GR, A, Benzidine Yellow, Permanent Yellow NCG, Tartrazine Lake, Quinoline Yellow,
Sudern 1, Permanent Orange, Indus Ren Brilliant Orange GN, Permanent Brown FG, Para Brown, Permanent Red 4R, Fire Red, Brilliant Carmine 6B, Bordeaux 5B, Thioindigo Red, Fast Violet B, Dioxazine Violet, Alkaline Blue Lake, Phthalocyanine Organic pigments such as blue, indigo, acid green lake, and phthalocyanine green are exemplified.

These coloring materials can be used alone or in combination. The amount used is preferably from 10 to 45% by weight based on the total amount of the oil-based ink composition for ball-point pens.

Solvents include glycol solvents such as ethylene glycol, diethylene glycol, propylene glycol and hexylene glycol, 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 mononormal butyl ether, dipropylene glycol monophenyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monoethyl ether, tripropylene glycol mononormal Glycol ether solvents such as butyl ether and tripropylene glycol monophenyl ether; alcohol solvents such as benzyl alcohol and α-methylbenzyl alcohol; propylene glycol methyl ether acetate; propylene glycol diacetate; N-methyl-2-pyrrolidone Etc. can be used.

These solvents can be used alone or as a mixture. The use amount thereof is preferably 35 to 80% by weight based on the total amount of the oil-based ink composition for a ballpoint pen.

Resins are added to improve fixability and prevent hand-through of handwriting, adjust viscosity, and promote dissolution of dyes. Condensed resins of ketones such as cyclohexanone, acetophenone and urea with formaldehyde, and cyclohexanone Condensed resins and their hydrogenated resins, maleic acid resins, copolymers of styrene and maleic ester,
A copolymer of styrene and acrylic acid or an ester thereof,
Polyvinyl pyrrolidone, polyvinyl butyral, polyvinyl acetal, polyamide which is a condensate of polymerized fatty acid and polyamines, epoxy resin, polyvinyl alkyl ether, coumarone-indene resin, polyterpene, xylene resin, rosin-based resin and hydrogenated product thereof, rosin-modified Maleic acid resin, vinyl pyrrolidone-vinyl acetate copolymer, polymethacrylic acid ester, polyacrylic acid polymethacrylic acid copolymer, polyoxyethylene and phenol resin.

These resins can be used alone or as a mixture. The amount used is preferably from 5 to 50% based on the total amount of the oil-based ink composition for a ballpoint pen.

[0013] N-Alkyloylmethyltaurine sodium is used to prevent the first brush of the oil-based ink composition for ball-point pens. Specific examples include sodium N-lauroylmethyltaurine, sodium N-tridecanoylmethyltaurine, sodium N-myristoylmethyltaurine, sodium N-pentadecanoylmethyltaurine, sodium N-palmitoylmethyltaurine, and N-heptadecanoylmethyl. Examples include sodium taurine, sodium N-stearoylmethyltaurine, and particularly, sodium N-lauroylmethyltaurine, sodium N-myristoylmethyltaurine,
-Sodium palmitoylmethyltaurine and sodium N-stearoylmethyltaurine are preferred.

N-Alkyloylmethyltaurine sodium can be used alone or as a mixture. The amount used is preferably 0.5 to 3% by weight based on the total amount of the oil-based ink composition for ballpoint pens. When the amount is less than 0.5% by weight or more than 3% by weight, the effect of preventing the first brush from being blurred is insufficient.

In addition to the above essential components, a lubricant such as castor oil, a polyoxyethylene adduct of castor oil, polyoxyethylene alkylamine, molybdenum disulfide, a preservative, a fungicide, a rust inhibitor, a dispersant, etc. It may be appropriately selected and used.

For preparing the oil-based ink composition for a ballpoint pen, a conventionally known method for producing an ink composition can be applied. That is, when a dye is used as a colorant, an oil-based ink composition for a ballpoint pen can be obtained by dissolving each component with a stirring and mixing machine, and when a pigment is used, another pigment is used with a dispersion and mixing machine. By dispersing together with the components, an oil-based ink composition for a ballpoint pen can be obtained. During the production, heating to dissolve solids such as dyes and using a filter to remove coarse particles such as pigments are particularly preferable methods.

[0017]

The oil-based ink composition for ball-point pens of the present invention is excellent in the prevention of initial brush rubbing because of its compatibility with the dye of sodium N-alkyloylmethyltaurine and its affinity with the metal surface due to its compatibility with the metal surface. Because the ink keeps fluidity without showing film forming action when the ink dries in the part,
It is presumed that this is because the ink is smoothly transferred to the ball and discharged when the ball rotates.

[0018]

EXAMPLES Examples and comparative examples will be described below. Example 1 Ethylene glycol monophenyl ether 22 parts by weight Benzyl alcohol 20 parts by weight Hilac 222 (ketone resin, manufactured by Honshu Chemical Industry Co., Ltd.) 16 parts by weight Polyvinylpyrrolidone 5 parts by weight Oxyethylene dodecylamine 10 parts by weight Spiron Violet C -RH (dye, manufactured by Hodogaya Chemical Industry Co., Ltd.) 15 parts by weight Balifast Black # 3802 (dye, manufactured by Orient Chemical Industry Co., Ltd.) 10 parts by weight N-lauroylmethyltaurine sodium 2 parts by weight After heating and stirring (80 ° C., 4 hours), the mixture was filtered under warm pressure to obtain a black oil-based ink composition for a ballpoint pen.

Example 2 Benzyl alcohol 30 parts by weight Propylene glycol 10 parts by weight Ethylene glycol monophenyl ether 10 parts by weight Halon 110H (ketone resin, manufactured by Honshu Chemical Industry Co., Ltd.) 15 parts by weight Polyoxyethylene (10) hydrogenated castor oil 8 Parts by weight Spiron Black GMH Special (dye, manufactured by Hodogaya Chemical Industry Co., Ltd.) 15 parts by weight Balifast Violet # 1701 (dye, manufactured by Orient Chemical Industry Co., Ltd.) 11 parts by weight 1 part by weight of N-myristoylmethyltaurine sodium The components were heated and stirred with a stirrer (80 ° C., 4 hours), and then filtered under warm pressure to obtain a black oil-based ink composition for a ballpoint pen.

Example 3 Ethylene glycol monophenyl ether 30 parts by weight Benzyl alcohol 15 parts by weight Halon 110H (described above) 12 parts by weight Polyoxyethylene (5) dodecylamine 10 parts by weight Balifast Blue # 1607 (Dye, Orient Chemical Co., Ltd. Co., Ltd.) 30 parts by weight N-palmitoylmethyltaurine sodium 3 parts by weight After heating and stirring the above components with a stirrer (80 ° C., 3 hours), the mixture was filtered under warm pressure to obtain a blue oil-based ink composition for a ballpoint pen. .

Example 4 Hexylene glycol 20 parts by weight Benzyl alcohol 20 parts by weight Propylene glycol monomethyl ether 10 parts by weight Hilac 222 (described above) 10 parts by weight Polyvinyl acetal 4 parts by weight Polyoxyethylene (20) octadecylamine 2.5 parts by weight Section S. P. T. Orange 6 (dye, manufactured by Hodogaya Chemical Industry Co., Ltd.) 15 parts by weight Spiron Red C-GH (dye, manufactured by Hodogaya Chemical Industry Co., Ltd.) 15 parts by weight Spiron Yellow C-2GH (dye, manufactured by Hodogaya Chemical Industry Co., Ltd.) 3 parts by weight N-stearoylmethyltaurine sodium 0.5 part by weight After heating and stirring the above components with a stirrer (70 ° C., 6 hours), the mixture was filtered under warm pressure to obtain a red oil-based ink composition for a ballpoint pen.

Example 5 Ethylene glycol monophenyl ether 30 parts by weight Benzyl alcohol 17.7 parts by weight Halon 110H (described above) 12 parts by weight Polyoxyethylene (5) dodecylamine 10 parts by weight Balifast Blue # 1607 (Dye, Orient Chemical 30 parts by weight N-palmitoylmethyltaurine sodium 0.3 parts by weight After heating and stirring the above components with a stirrer (80 ° C., 3 hours), filtration under warm pressure is performed, and a blue oil-based ink composition for a ballpoint pen is used. I got something.

Example 6 Ethylene glycol monophenyl ether 22 parts by weight Benzyl alcohol 17 parts by weight Hilac 222 (ketone resin, manufactured by Honshu Chemical Industry Co., Ltd.) 16 parts by weight Polyvinylpyrrolidone 5 parts by weight Oxyethylene dodecylamine 10 parts by weight Ron Violet C-RH (Dye, manufactured by Hodogaya Chemical Industry Co., Ltd.) 15 parts by weight Balifast Black # 3802 (Dye, manufactured by Orient Chemical Industry Co., Ltd.) 10 parts by weight N-lauroylmethyltaurine sodium 5 parts by weight After heating and stirring (80 ° C., 4 hours) with a stirrer, the mixture was filtered under warm pressure to obtain a black oil-based ink composition for a ballpoint pen.

Comparative Example 1 A black oil-based ink composition for a ballpoint pen was obtained in the same manner as in Example 1 except that oleic acid was used instead of sodium N-lauroylmethyltaurine.

Comparative Example 2 A black oil-based ink composition for a ballpoint pen was prepared in the same manner as in Example 2 except that polyoxyethylene (10) hydrogenated castor oil was used in place of sodium N-myristoylmethyltaurine. Obtained.

Comparative Example 3 A red oil-based 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 N-palmitoylmethyltaurine.

A first brush rub test was performed on the oil-based ink compositions for ball-point pens obtained in Examples 1 to 4 and Comparative Examples 1 to 3. Table 1 shows the results.

Preparation of Test Samples: Each of the oil-based ink compositions for ball-point pens obtained in Examples 1 to 4 and Comparative Examples 1 to 3 was commercially available using an oil-based ball-point pen (BK100, Pentel Co., Ltd.).
And the pen tip is made of a stainless steel tip and a cemented carbide ball), and 0.3 g was filled in the same writing implement as a test sample.

First brush rub test 1: After writing each test sample by hand, the cap was taken off and the temperature was 50
It is left for 24 hours under the condition of 30 ° C. and 30% humidity. After taking it out, it is left for 2 hours in a room at a temperature of 22 ° C. and a humidity of 60%, and is returned to room temperature. The length from the start of the writing to the position of the handwriting that can be written normally is measured with a ruler (unit: mm).

First brush rub test 2: After writing each test sample by hand, the cap was taken off and the temperature was 40
It is left for 3 months under the condition of 50 ° C. and 50% humidity. After taking it out, it is left for 2 hours in a room at a temperature of 22 ° C. and a humidity of 60%, and is returned to room temperature. The length from the start of the writing to the position of the handwriting that can be written normally is measured with a ruler (unit: mm).

[0031]

[Table 1]

[0032]

As described above in detail, the oil-based ink composition for a ball-point pen according to the present invention has an excellent effect that almost no initial brush blur occurs even when stored for a long period of time.

Claims (1)

[Claims] 1. An oil-based ink composition for a ballpoint pen, comprising at least a coloring material, a solvent, a resin, and sodium N-alkyloylmethyltaurine.