JP2003165941A - Water base ink composition for ball point pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a water base ink composition for a ball point pen which has such quality that the ink is consumed without causing blurring of handwriting in writing, in the water base ink composition capable of being used in a writing implement having an ink housing tube with a nib set at its one end in which an ink and an ink non-preventing body are directly filled. <P>SOLUTION: The water base ink composition for the ball point pen comprises at least a pigment such as an inorganic pigment and an organic pigment, water, a water soluble organic solvent such as glycols and alcohols, a viscosity modifier such as a water soluble polymer, and zinc stearate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based ink composition for a ballpoint pen which can be used for a writing instrument in which an ink containing tube having a pen tip attached at one end is directly filled with ink and an ink backflow preventive. The present invention relates to a water-based ink composition for a ballpoint pen, which has a quality that allows ink to be consumed without causing scratches on a writing handwriting.

[0002]

2. Description of the Related Art Conventionally, ball-point pens using water-based ink have a lack of lubricity in the ink itself, causing friction at the contact points between the ball and the ball holder and causing wear to the ball holder during writing. Was there.

Generally, the ball holder uses a material softer than the ball, and since there are fine irregularities on the surface of the ball, friction between the ball and the ball holder causes contact between the ball and the ball. The seat of the holder will be worn. Due to this seat wear, the balls enter the ball holder and gradually close the ink through holes. As a result, the amount of ink discharged is reduced, which may cause blurring of handwriting, or even make writing impossible. Note that the seat wear occurs remarkably when a pigment is used as the colorant.

In order to solve the above problems, an attempt is made to improve the ink lubricity by adding water-soluble cutting oil or lubricating oil to the ink. For example, JP-A-60-63265
Japanese Patent Laid-Open No. 5-271603 discloses an aqueous ink composition for ballpoint pens containing an n-vinyl-2-pyrrolidone oligomer, and Japanese Patent Laid-Open No. 5-271603 discloses an aqueous pigment ink for ballpoint pens containing a dialkylthiourea.

[0005]

These prior arts provide the function of a lubricating oil by addition, but their effect was insufficient to suppress the bearing wear that is markedly caused by the use of pigments.

An object of the present invention is to ensure good ink dischargeability by suppressing wear of the seat due to rotation of the ball.
Another object of the present invention is to provide a water-based ink composition for a ballpoint pen, which has a quality that allows ink to be consumed without causing handwriting smearing by writing.

[0007]

DISCLOSURE OF THE INVENTION The gist of the present invention is a water-based ink composition for a ballpoint pen containing at least a pigment, water, a water-soluble organic solvent, a viscosity modifier and zinc stearate. .

The details will be described below. The zinc stearate used in the present invention is used for the purpose of suppressing seat wear in writing. The particle size is preferably in the range of 0.1 to 5.0 μm. If the particle size is less than 0.1 μm, the effect of suppressing seat wear is insufficient, and if it exceeds 5.0 μm, pen nib may be clogged with zinc stearate particles, resulting in poor writing. The amount used in the water-based ink composition for ballpoint pens is 0.01 to 3.0% by weight.
Is preferred. If the amount used is less than 0.01% by weight, the effect of suppressing seat wear cannot be obtained, and if it exceeds 3.0% by weight, the ink viscosity increases and the fluidity becomes poor, and the ink composition becomes It may be difficult to eject the ink from the pen tip, which may cause blurring of handwriting.

The pigment is used as a colorant in the aqueous ink composition for a ballpoint pen of the present invention. Specific examples of the pigment include Special Black 6 and S
170, S610, S5, S4, S4A, S550,
Same 35, Same 250, Same 100, Printex 150
T, same U, same V, same 140U, same 140V, same 95, same 90, same 85, same 80, same 75, same 55, same 45, same P, same XE2, same L6, same L, same 300, The same 30, the same 3, the same 35, the same 25, the same 200, the same A, the same G (above, manufactured by Degussa Japan KK), # 2400B, # 235.
0, # 2300, # 2200B, # 1000, # 95
0, # 900, # 850, # MCF88, MA600,
MA100, MA7, MA11, # 50, # 52, # 4
5, # 44, # 40, # 33, # 32, # 30, CF
9, # 20B, # 4000B (manufactured by Mitsubishi Kasei Co., Ltd.), MONARCH 1300, 100, 1000, 900, 880, 800, 700,
MOGUL L, REGAL 400R, 660R,
Same 500R, Same 330R, Same 300R, Same 99R, EL
FTEX 8, 12 and BLACK PEARLS 2
000 (above, manufactured by Cabot Corp., USA), Ra
ven7000, 5750, 5250, 500
0, 3500, 2000, 1500, 125
5, same 1250, same 1200, same 1170, same 106
0, 1040, 1035, 1020, 100
0, 890H, 890, 850, 790, 7
80, 760, 500, 450, 430, 4
20, the same 410, the same 22, the same 16, the same 14, the same 825o
il Beads, H20, C, Conducte
x975, 900, SC (above, Colombian
Carbon black such as Carbon Japan Co., Ltd., KA
-10, the same 10P, the same 15, the same 20, the same 30, the same 35,
60, 80, 90, KR-310, 380, 460, 480 (Titanium Industry Co., Ltd.), TYPURE R-900, 902, 960 (Dupon Co., Ltd.) ), Typepaque CR-50, 58, 6
0, 67, 80, 90, R-580, 670,
680, 780, 820, 930 (all manufactured by Ishihara Sangyo Co., Ltd.), JR-300, 403, 600.
A, 800, 805 (above, manufactured by Teika Co., Ltd.), P
Titanium oxide such as 25 (manufactured by Nippon Aerosil Co., Ltd.), B
S-605, 607 (above, manufactured by Toyo Aluminum Co., Ltd.),
Bronze powder P-555, P-777 (Nakajima Metal Foil Industry Co., Ltd.), bronze powder 3L5, 3L7 (Fukuda Metal Foil Industry Co., Ltd.) and other metal powder pigments, or black Inorganic pigments such as iron oxide, yellow iron oxide, red iron oxide, ultramarine blue, navy blue, cobalt blue, chrome green, and chromium oxide, Hansa Yellow-10G, 5G, 3G, 4, GR, A, benzidine yellow, Permanent Yellow NCG, Tartrazine Lake, Quinoline Yellow, Sudan 1, Permanent Orange, Induslen Brilliant Orange GN, Permanent Brown F
G, Para Brown, Permanent Red 4R, Fire Red, Brilliant Carmine BS, Pyrazolone Red, Lake Red C, Quinacridone Red, Brilliant Carmine 6B, Bordeaux 5B, Thioindigo Red,
Fast violet B, dioxazine violet,
Organic pigments such as alkali blue lake, phthalocyanine blue, indigo, acid green lake, phthalocyanine green and the like can be mentioned. In addition to these, inorganic fluorescent pigments such as zinc sulfide, zinc silicate, zinc cadmium sulfate, calcium sulfide, strontium sulfide, and calcium tungstate can be cited. It is also possible to use an aqueous ink base of a dispersed pigment in which the pigment is dispersed in an aqueous medium. Specifically, Fuji SP Black 8
031, 8119, 8167, 8276, 83
81, same 8406, Fuji SP Red 509
6, 5111, 5193, 5220, 554
3, 5544, Fuji SP Bordeaux
5500, Fuji SP Blue 6062, 6
133, 6134, 6401, Fuji SP G
reen 7051, Fuji SP Yellow
4060, 4178, 4218, Fuji SP
Violet 9011, Fuji SP Pink
9524, 9527, Fuji SP Orange
534, Fuji SP Brown 3074 (above, manufactured by Fuji Pigment Co., Ltd.), Emacol Black
CN, Emacol Blue FBB, FB, K
R, Emacol Green LXB, Emacol
Violet BL, Emacol Brown31
01, Emacol Carmine FB, Emac
ol Red BS, Emacol Orange
R, Emacol Yellow FD, same IRN, same 3601, same FGN, same GN, same GG, same F5G, same F
7G, 10GN, 10GN, Sandy Sup
er Black K, C, Sandye Supe
r Gray B, Sandy Super Bro
wnSB, FRL, RR, Sandy Supe
r Navy Blue HRL, the same GLL, the same HB,
Same FBL-H, same FBL-160, same FBB, Sand
ye Super Violet BL H / C, same B
L, same BLN, Sandye Super Borde
aux FR, Sandye Super Pink
FBL, F5B, and Sandy Super Rub
ine FR, Sandy Super Carmi
ne FB, Sandye SuperRed FF
G, same RR, same BS, same 1315, Sandye Su
perYellow D215, Sandye Sup
er Orange FL, same R, same BO, Sandy
e Gold Yellow 5GR, same R, same 3R,
Sandye Yellow GG, F3R, IR
C, the same FGN, the same GN, the same GRS, the same GSR-130,
Same GSN-130, same GSN, same 10GN (above, Sanyo Pigment Co., Ltd. product), Rio Fast Black Fx
8012, 8313, 8169, Rio Fas
t Red Fx 8209, 8172, Rio F
ast Red S Fx 8315, 8316, R
io Fast Blue Fx 8170, Rio
Fast Blue S Fx 8312, Rio F
ast Green S Fx 8314, EM Gr
een G, EM Royal Blue FX-04
72, EM Black K-16 (all manufactured by Toyo Ink Co., Ltd.), NKW-2101, 2102, 210.
3, 2104, 2105, 2106, 210
7, ibid 2108, ibid 2117, ibid 2127, ibid 213
7, 2167, 2101P, 2102P, 21
03P, 2104P, 2105P, 2106P,
2107P, 2108P, 2117P, 212
7P, 2137P, 2167P, 3002, 3
003, 3004, 3005, 3007, 30
77, same 3008, same 3402, same 3404, same 340
5, 3407, 3408, 3477, 360
2, 3603, 3604, 3605, 360
7, ibid 3677, ibid 3608, ibid 3702, ibid 370
3, 3704, 3705, 3777, 370
8, the same 6013, the same 6038, the same 6559 (all manufactured by Nippon Fluorescent Co., Ltd.), Victoria Yellow G-11, the same G-.
20, Victoria Orange G-16, Same G-21, Victoria Red G-19, Same G-22, Victoria Pink G-17, Same G-23, Victoria Green G
-18, G-24, Victoria Blue G-15, G-25 (above, manufactured by Mikuni Dye Co., Ltd.), Pollux Blue PC5T-1020, Pollux Black PC8.
Examples include Pollux series such as T-135 and POLOK SEED IT-1030 (above, manufactured by Sumika Color Co., Ltd.) and the like, and these can be used alone or in combination of two or more.

Water is used as a main solvent in the present water-based ink composition for ballpoint pens.

The water-soluble organic solvent is used for the purpose of preventing the water-based ink composition for the present ballpoint pen from drying, preventing freezing at low temperatures, and a pigment dispersion medium. As specific examples, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-butylene glycol, dipropylene glycol, tripropylene glycol, polyethylene glycol, thiodiethylene glycol, hexylene glycol, tetralin, glycols such as glycerin, and the like. Ethylene glycol monomethyl ether, propylene glycol monomethyl ether, diethylene glycol monomethyl ether, dipropylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monoethyl ether, diethylene glycol monoethyl ether, dipropylene glycol monoethyl ether,
Ethylene glycol monobutyl ether, propylene glycol monobutyl ether, diethylene glycol monobutyl ether, dipropylene glycol monobutyl ether, triethylene glycol monomethyl ether, tripropylene glycol monomethyl ether, triethylene glycol monoethyl ether, tripropylene glycol monoethyl ether, triethylene glycol monobutyl ether Ethers such as butyl ether, tripropylene glycol monobutyl ether, ethylene glycol monomethyl ether acetate, dipropylene glycol monomethyl ether acetate, ethylene glycol monophenyl ether, propylene glycol monophenyl ether, benzyl alcohol, methanol, ethanol, propano Le, isopropanol, alcohols such as butanol, N- methyl-2-pyrrolidone, 2
-Pyrrolidone or the like can be used, and these are one kind or two kinds.
One or more species can be selected and used in combination.

The viscosity modifier is used to adjust the viscosity of the present water-based ink composition for ballpoint pens. Specific examples thereof include polyvinyl alcohol, sodium polyacrylate, polyacrylamide, polyethylene oxide, water-soluble synthetic polymers such as polyvinylpyrrolidone, guar gum, seed polysaccharides such as locust bean gum and its derivatives, xanthan gum, microbial-based polysaccharides such as welan gum. Seaweed polysaccharides such as saccharides, carrageenan, alginic acid and its derivatives, resin polysaccharides such as taragant gum, and cellulosic resins can be used. Further, these may be used alone or in combination of two or more.

In addition to the above components, various components used in conventional water-based ink compositions for ballpoint pens can also be used.

For example, a resin may be added to improve the fixability of the handwriting on the writing surface. Specific examples of the resin include, for example, styrene-acrylic type, acrylic type, styrene-butadiene type resin emulsion,
Examples include alkali-soluble resins and betaine-type acrylic resins.

Further, wetting agents such as urea, ethylene urea and thiourea, preservatives such as benzothiazoline and omadine, rust preventives such as benzotriazole, resins and surfactants as pigment dispersion stabilizers, Various additives such as an antifoaming agent can be added as necessary.

Further, a dye can be added as a complementary colorant. As a specific example, C.I. I. Direct Black 17, the same 19, the same 22, the same 32, the same 38, the same 51,
71, C.I. I. Direct Yellow 4, same 26, same 4
4, 50, C.I. I. Direct Red 1, same 4, same 2
3, ibid 31, ibid 37, ibid 39, ibid 75, ibid 80, ibid 8
1, the same 83, the same 225, the same 226, the same 227, C.I. I.
Direct Blue 1, 1, 15, 41, 71, 8
6, the same 87, the same 106, the same 108, the same 199, direct dyes such as C.I. I. Acid Black 1, Same 2, Same 24, Same 26, Same 31, Same 52, Same 107, Same 109, Same 11
0, 119, 154, C.I. I. Acid Yellow 1, 7, 7, 17, 19, 23, 25, 29,
Same 38, Same 42, Same 49, Same 61, Same 72, Same 78, Same 110, Same 127, Same 135, Same 141, Same 142,
C. I. Acid Red 8, same 9, same 14, same 18, same 26, same 27, same 35, same 37, same 51, same 52, same 5
7, ibid 82, ibid 83, ibid 87, ibid 92, ibid 94, ibid 11
1, the same 129, the same 131, the same 138, the same 186, the same 24
9, 254, 265, 276, C.I. I. Acid Violet 15, the same 17, the same 49, C.I. I. Acid Blue 1, the same 7, the same 9, the same 15, the same 22, the same 23, the same 2
5, Same 40, Same 41, Same 43, Same 62, Same 78, Same 8
3, 90, 93, 100, 103, 104,
112, 113, 158, C.I. I. Acid Green 3, the same 9, the same 16, the same 25, the same 27, C.I. I. Acid dyes such as Acid Orange 56, C.I. I. Food dyes such as Food Yellow 3, Malachite Green (C.I. 42
000), Victoria Blue FB (C.I. 4404)
5), methyl violet FN (C.I.
5), Rhodamine F4G (CI.45160), Rhodamine 6GCP (CI.45160), and the like.

In producing the water-based ink composition for a ballpoint pen of the present invention, various conventionally known methods can be adopted. For example, by previously dispersing the pigment with a disperser such as a ball mill, a bead mill, or a three-roll mill to form a dispersed pigment, and mixing the above components, and mixing and stirring with a stirrer such as a propeller stirrer or a Henschel mixer. Easily obtained. You may perform filtration etc. as needed. When a water-based ink base of a dispersed pigment is used as the pigment, the dispersing step with a disperser is unnecessary.

[0018]

In the aqueous ink composition for a ballpoint pen of the present invention, zinc stearate penetrates between the ball and the ball holder and acts like a bearing. Therefore, the friction between the ball and the ball holder will be reduced,
As a result, it is thought that it is possible to prevent the bearing wear in writing and prevent the ball from sinking into the ball holder, thereby preventing the flow of ink from being obstructed and making it possible to prevent scraping of the handwriting and the inability to write. To be

[0019]

Embodiments will be described in detail with reference to embodiments. Among the above components, Kelzan AR and ion-exchanged water were stirred with a homomixer for 10 minutes to obtain an aqueous solution of Kerzan AR, and the remaining components were added, and the mixture was further stirred for 30 minutes to obtain a red ink.

[0020] Of the above components, the total amount of ethylene glycol and the total amount of zinc stearate were mixed to form a slurry. Kerzan AR
Each component other than the aqueous solution and a slurry of zinc stearate were dispersed and mixed in a ball mill for 1 hour. The above Kerzan aqueous solution was added to the collected dispersion and stirred to obtain a white ink.

[0021] Of the above components, the entire amount of Jaguar 8060 and 30.0 parts of ion-exchanged water were mixed and dissolved to obtain an aqueous solution. The total amount of propylene glycol and the total amount of zinc stearate were mixed to form a slurry. A slurry of zinc stearate and each component other than the Jaguar aqueous solution were stirred and mixed with a propeller stirrer for 30 minutes. Further, the above Jaguar aqueous solution was added and stirred to obtain a black ink.

Example 4 A white ink was obtained in the same manner as in Example 2 except that zinc stearate was changed to zinc stearate (average particle size 8 μm, Wako Pure Chemical Industries, Ltd.).

Comparative Example 1 A red ink was obtained in the same manner as in Example 1 except that the zinc stearate of Example 1 was changed to ion-exchanged water.

[0024] Among the above components, the total amount of Kerzan T and 30 parts of ion-exchanged water were stirred for 10 minutes with a homomixer to obtain a Kerzan T aqueous solution. Further, the remaining total amount of ion-exchanged water and the total amount of dibutylthiourea were dissolved with heating and stirring at 60 ° C. for 10 minutes to obtain an aqueous solution of dibutylthiourea. A Kerzan aqueous solution, a dibutyl thiourea aqueous solution, and the rest of the above components were added, and the mixture was further stirred for 30 minutes to obtain a red ink.

[0025] The above components were mixed and stirred to obtain an ink backflow preventer.

0.8 g of a hybrid (product code K108) manufactured by Pentel Co., Ltd. was filled with the water-based ink composition for ball-point pens obtained from Examples 1 to 4 and Comparative Examples 1 and 2, and the above ink backflow prevention was performed on the hybrid ink. After filling 0.1 g of the body, air bubbles in the ink were removed using a centrifuge to prepare a test ballpoint pen. Using this test ballpoint pen, tests were carried out for writing distance and seat wear.

Writing distance: Using a rotation type continuous writing tester (manufactured by Seiki Kogyo Kenkyusho), writing speed 7 cm / sec, load 981
Continuous writing was performed at mN and an angle of 70 °, and the writing distance until the occurrence of blurring was measured.

Seat wear: Examples 1 to 1 in continuous writing
4. Using a test ballpoint pen prepared by filling the water-based ink composition for ballpoint pens obtained from Comparative Examples 1 and 2, the ball protrusion length before writing and the ball protrusion length after writing when the pen tip was facing up. The wear amount of the seat (longitudinal direction distance) was measured from the difference between The ball protrusion length was measured from the tip of the ball holder to the tip of the ball. In Examples 1 to 4, the ink was consumed without blurring, so the measurement was performed at the end of writing. In addition, Comparative Examples 1 and 2 were cut off at 400 m writing and measured at this point.

[0029]

[Table 1]

[0030]

As described above in detail, the water-based ink composition for a ball-point pen according to the present invention has little seat wear due to writing, and therefore has a quality that allows ink to be consumed without causing blur in handwriting. is there.

Claims (2)

[Claims] 1. A water-based ink composition for a ball-point pen, which contains at least a pigment, water, a water-soluble organic solvent, a viscosity modifier, and zinc stearate. 2. Zinc stearate having a particle size of 0.1 to 0.1.
The water-based ink composition for a ballpoint pen according to claim 1, which has a thickness of 5.0 μm.