JP2003103982A - Ball-point pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit an ink leakage caused by an impact when a pen point faces upward and a disorder of handwriting width due to the transfer of a large amount of ink to a face to be written on during handwriting, even when ink using a pigment whose particle diameter is comparatively larger is used. SOLUTION: In the ball-point pen with radial grooves formed on a seat face for retaining a ball inside a ball-point pen tip, the width of the radial groove is set to be 0.10 to 0.149 mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballpoint pen in which a ballpoint pen tip having radial grooves formed in a ball holder of a ball container is connected to an ink tank for directly containing a water-based ink in a free state.

[0002]

2. Description of the Related Art Conventionally, a ball-point pen is one in which a writing ball in a ball-point pen tip is rotatably held, and the ink in an ink container is transferred to the writing surface in accordance with the rotation of the writing ball. Focusing on the ball-point pen tip, the structure inside the ball-point pen tip has a seat surface for holding a ball, and this seat surface is provided with radial grooves called arrow grooves. The radial groove width has a width conforming to various inks in order to smoothly pass the ink from the ink containing portion. Particularly in recent years, when glass flake pigments or metal pigments are used in order to obtain handwriting with glitter, the groove width is increased because the pigment particle diameter is relatively large. For example, Japanese Unexamined Patent Publication No. 2001-158194 discloses that the groove width is set to 0.15 mm or more so that clogging of the pigment is less likely to occur.

Further, as an example of the ink for obtaining the above-mentioned glittering handwriting, Japanese Patent Laid-Open No. 2001-214114 discloses that an iris color tone is obtained by using a pigment which is chromaticized by subjecting glass powder to a coloring treatment. To obtain the handwriting of
The publication of 001-192597 discloses that handwriting with high glitter is obtained by using metal foil powder.

Further, it is known to use a viscosity modifier for adjusting the viscosity of the above-mentioned ink, which is used for stabilizing dispersion of various pigments and obtaining smooth handwriting. Is there. Particularly in recent years, as a viscosity modifier that solves various drawbacks of high-viscosity oil-based ballpoint pens and low-viscosity type water-based ballpoint pens, pigment migration is limited by limiting the movement of ink due to its relatively high viscosity when not writing. Controls sedimentation, ink leakage and air bubble mixing,
At the time of writing, the shearing force of the rotating ball lowers the viscosity to impart a shear thinning property that smoothly ejects ink, and various polysaccharides are used as substances whose physical properties are relatively stable when stored for a long period of time. Proposed to be used.

For example, as an example thereof, Japanese Examined Patent Publication No. 64-8
Xanthan gum is disclosed in JP-A-4-214.
Japanese Patent No. 782 discloses welan gum, and Japanese Patent Application Laid-Open No. H6-6
No. 88050 discloses succinoglucan.

[0006]

However, by providing a large groove width, there is an impact from the outside when the pen tip is in the upward state, and the ink of the ink container passes through the radial groove from the ball of the pen tip. When air enters, the ink in the ink storage moves in the direction opposite to the pen tip and leaks, and a large amount of ink is supplied into the ball tip, so a large amount of ink is transferred to the writing surface during writing. As a result, there was a problem that the handwriting width was disturbed. It is an object of the present invention to use ink containing a pigment having a relatively large pigment particle size, ink leakage due to impact when the pen tip is facing upward, and handwriting due to transfer of a large amount of ink to the writing surface during writing. It is to suppress the width irregularity.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a radial groove width provided on a seat surface in a ballpoint pen tip is 0.100 m.
The gist of the present invention is a ball-point pen characterized in that it is not less than m and not more than 0.149 mm.

The present invention will be described in detail below. The ball-point pen tip of the ball-point pen used in the present invention is composed of a ball-point pen tip body and a writing ball, and the writing body is provided at the tip of the tip body. The chip body is made by cutting a metal material such as free-cutting steel. As the material of the chip body, for example, free-cutting stainless steel, brass, or nickel silver can be used. The outer shape of the chip body is a conical shape at the front end and a cylindrical shape at the rear end. Regarding the shape of the inside of the tip, a portion for accommodating a writing ball and an ink conduction hole communicating from the ball accommodating portion to the rear end side are provided at the tip portion. The ball storage portion has a concave shape with an open end, and the open end is slightly caulked. A seating surface is provided on a portion of the ball housing portion facing the open side. The seat surface is a taper surface having an inclination of about 30 ° and converges with the central hole to communicate with the ink conducting hole. Grooves are radially provided on the seat surface. The ballpoint pen used in the present invention has a groove width of 0.100.
mm or more and 0.149 mm or less is suitable. This is because the ballpoint pen of the present invention uses a water-based ink containing a pigment having a relatively large particle size, as will be described later.
If it is smaller than 00 mm, it will be difficult to supply the ink from the ink conduction hole, and line skipping and blurring will occur.
If it is larger than the above range, ink may leak due to an impact when the pen tip is facing upward, and the handwriting width may be disturbed due to a large amount of ink supplied into the ball tip.

For the writing ball, when an ink containing a pigment having a relatively large particle size such as a glitter ink is used, the diameter of the ball is preferably 0.8 to 1.0 mm.

The pigment having an average diameter (hereinafter referred to as a particle diameter) of 5 to 45 μm, which is the maximum length of the particle diameter used in the present invention, is used for the purpose of producing a glittering feeling different from the color of the handwriting. , Glass flake pigments, aluminum powder pigments, pearl pigments, metal evaporated inorganic pigments and the like. Commercially available glass flake pigments include those in which flaky glass is coated with a metal by electroless plating or sputtering. Crystal Star GF11
45 (particle size, 40 μm), GF1345 (particle size, 4
0 μm), the same GF1445 (particle size, 40 μm), the same
1545 (particle size, 40 μm), Metashine REFSX
-2015PS (particle size, 15 μm), same REFSX-2
025PS (particle size, 25 μm), the same RESFX-20
25PS (particle size, 25 μm), same as RCFSX-503
0NS (particle size, 30 μm), the same RCFSX-1020
NB (particle size, 20 μm), the same RCFSX-1020R
S (particle size, 20 μm), same as RCFSX-1020RC
(Particle size, 20 μm) (above, Toyo Aluminum Co., Ltd.)
Manufactured) and the like.

As the metal-deposited inorganic pigment, Iriodi
n 111 (main particle size, 15 μm or less), 120
(Main particle size, 5 to 20 μm), the same 121 (main particle size,
5-20 μm), 201 (main particle size, 5-25 μm)
m), the same 211 (main particle size, 5 to 25 μm), the same 2
31 (main particle size, 5 to 25 μm), the same 302 (main particle size, 5 to 20 μm), the same 323 (main particle size, 5 to 20)
μm), the same 520 (main particle size, 5 to 20 μm), the same
522 (main particle size, 5 to 20 μm), 524 (main particle size, 5 to 20 μm), GP (above, manufactured by Merck Japan Ltd.), ULTIMICA SA-100 (main particle size, 10 μm or less) ), The same SB-100 (main particle size,
5 to 30 μm), YB-100 (main particle size, 5 to 3)
0 μm), the same RB-100 (main particle size, 5 to 30 μm
m), the same RBB-100 (main particle size, 5 to 30 μm)
m), the same VB-100 (main particle size, 5 to 30 μm),
BB-100 (main particle size, 5 to 30 μm), G
B-100 (main particle size, 5 to 30 μm), same RYB-
100 (main particle size, 5 to 30 μm), PEARL-GL
AZEMM-100R (main particle size, 15 μm or less), MF-100 (main particle size, 50 to 30 μm), M
F-100R (main particle size, 5-30 μm), MC-
302 (main particle size, 5 to 30 μm), MC-323R
(Main particle size, 5 to 30 μm), MC-520 (main particle size, 5 to 30 μm), MC-522 (main particle size,
5-30 μm), MC-524 (main particle size, 5-3
0 μm), MB-100RF (main particle size, 5 to 30 μm)
m), the same MG-100RF (main particle size, 5 to 30 μm)
m), the same MRB-100RF (main particle size, 5 to 30 μm)
m), the same MY-100RF (main particle size, 5 to 30 μm)
m), the same MV-100RF (main particle size, 5 to 30 μm)
m) (above, manufactured by Nippon Koken Kogyo Co., Ltd.), TAYCAP
EARL SP-100 (main particle size: 2 to 10 μm),
SP-350 (main particle size, 3 to 20 μm), S
P-650 (main particle size, 5-40 μm), TP-1
00 (main particle size: 2 to 10 μm), TP-350
(Main particle size, 3 to 20 μm), TP-650 (main particle size, 5 to 40 μm), TPX-720 (main particle size, 7 to 45 μm) (these are manufactured by Teika Co., Ltd.), etc. Is mentioned. These can be used alone or in combination of two or more.

If the amount used is too small, a sufficient brilliance cannot be obtained in the handwriting, and if the amount is too large, the handwriting has a brilliant color tone only, and contrast is lost. It is preferably used in the range of 2.0 to 15.0% by weight.

Further, the size of the luster pigment has a particle size of 5
It is preferably from μm to 45 μm. The luster pigment has a range of particle diameters in which a normal distribution is centered around the particle diameter. Therefore, if the particle size is larger than 45 μm, 1
There are many coarse particles having a size of more than 00 μm, and the coarse particles may be clogged with the pen tip to make writing impossible. On the other hand, if the particle size is smaller than 5 μm, it is not possible to obtain a sufficient glossy feeling on the handwriting.

At least the polysaccharide used in the present invention can impart a strong effect of imparting a shear thinning property to the ink and an effect of stabilizing the physical properties during long-term storage. Specific examples thereof include seed-based guar gum, Locust bingham, galactomannan, pectin and its derivatives, psyllium pseudogum, tamarin dough gum, microbial-based alka gum, xanthan gum, leosan gum, ramzan gum, welan gum, duran gum, seaweed carrageenan,
Examples thereof include alginic acid and its derivatives, resin-based taragant gum, cellulose such as ethyl cellulose, methyl cellulose, hydroxymethyl cellulose, carboxymethyl cellulose and its derivatives. These are one or two
A mixture of two or more species can be used.

The amount used is 0.0 with respect to the total amount of ink.
5 to 2.00% by weight, preferably 0.10 to 1.
It is 00% by weight. If it is less than 0.05% by weight, the viscosity of the ink is too low, and the effect of preventing sedimentation may be reduced with respect to the pigment that imparts glitter and other pigments that are used in combination. On the other hand, when the amount exceeds 2.00% by weight, the viscosity becomes too high, and the ejection of the ink from the pen tip portion tends to become poor.

Other colorants may be used in combination with the pigment which imparts glitter. From the ink obtained by the combined use, it is possible to obtain handwriting having a contrast due to the color tone originally possessed by the glittering pigment and the color tone of the other colorant used in combination. When using a pigment as a colorant,
Conventionally known pigments can be used, and as a specific example,
Carbon black, such as furnest black, contact black, thermal black, acetylene black,
Inorganic pigments such as black iron oxide, yellow iron oxide, red iron oxide, ultramarine blue, navy blue, cobalt blue, titanium yellow, turquoise, molybdate orange, and titanium oxide, C.I. I. PI
GMENT RED2, Same3, Same5, Same17, Same22,
Ibid 38, ibid 41, ibid 48: 2, ibid 48: 3, ibid 49, ibid 50: 1, ibid 53: 1, ibid 57: 1, ibid 58: 2, ibid 6
0, 63: 1, 63: 2, 64: 1, 88, 112, 122, 123, 144, 146, 149, 166, 168, 170, 176, 177, 178, 179, 180, 185, 190, 194, 206, 207, 209, 2
16, ibid. 245, C.I. I. PIGMENT ORANGE
E 5, ibid 10, ibid 13, ibid 16, ibid 36, ibid 40, ibid 43, C.I. I. PIGMENTVIOLET 19, ibid 23, ibid 31, ibid 33, ibid 36, ibid 38, ibid 50, C.I.
I. PIGMENT BLUE 2, 15 and 15:
1, 15: 2, 15: 3, 15: 4, 15:
5, the same 16, the same 17, the same 22, the same 25, the same 60, the same 6
6, C.I. I. PIGMENT BROWN 25, 2
6, C.I. I. PIGMENT YELLOW 1, the same 3, the same 12, the same 13, the same 24, the same 93, the same 94, the same 9
5, ibid 97, ibid 99, ibid 108, ibid 109, ibid 110,
117, 120, 139, 153, 166,
167, 173C. I. PIGMENT GREEN
Organic pigments such as 7, 10, and 36 are listed. These can be used alone or in combination of two or more.

Further, since it is advantageous in the production of pigment ink,
It is also possible to use an aqueous ink composition base of a dispersed pigment in which the pigment is dispersed in an aqueous medium. Specifically, Fuji. SP series, Sanyo dye's Emacol series, Sandye series, Orient Chemical Industry's MicroPigmo series, MicroJet series, Toyo Ink's Rio, Fast series, EM Color series (above, inorganic, Organic pigment dispersion), Nippon Fluorescent Chemical Co., Ltd. NKW series, Toyo Soda Co., Ltd. Cosmocolor series, Shin Loihi Co., Ltd.
Color base series (above, dispersion of fluorescent pigment) and the like can be mentioned. These can be used alone or in combination of two or more.

When a dye is used as the colorant, a conventionally known dye can be used. Specific examples include C.I.
I. Direct Black 17, Same 19, Same 22 and Same 3
2, the same 38, the same 51, the same 71, C.I. I. Direct Yellow 4, the same 26, the same 44, the same 50, C.I. I. Direct Red 1, the same 4, the same 23, the same 31, the same 37, the same 39, the same 75, the same 80, the same 81, the same 83, the same 225, the same 226,
227, C.I. I. Direct Blue 1, 15 and 4
1, the same 71, the same 86, the same 87, the same 106, the same 108, the same dye 199 and the like, and C.I. I. Acid Black 1,
Ibid 2, ibid 24, ibid 26, ibid 31, ibid 52, ibid 107, ibid 109, ibid 110, ibid 119, ibid 154, C.I. I. Acid Yellow 1, Same 7, Same 17, Same 19, Same 23, Same 2
5, ibid 29, ibid 38, ibid 42, ibid 49, ibid 61, ibid 7
2, ibid 78, ibid 110, ibid 127, ibid 135, ibid 14
1, ibid. 142, C.I. I. Acid Red 8、9、1
4, ibid 18, ibid 26, ibid 27, ibid 35, ibid 37, ibid 5
1, 52, 57, 82, 83, 87, 9
2, ibid 94, ibid 111, ibid 129, ibid 131, ibid 13
8, ibid 186, ibid 249, ibid 254, ibid 265, ibid 27
6, C.I. I. Acid Violet 15, Same 17 and Same 4
9, C.I. I. Acid Blue 1, the same 7, the same 9, the same 15,
22, 23, 25, 40, 41, 43, 62, 78, 83, 90, 93, 100, 103, 104, 112, 113, 158 ,
C. I. Acid Green 3, 9th, 16th, 25th,
27, C.I. I. Acid dyes such as Acid Orange 56,
C. I. Food dyes such as Food Yellow 3, Malachite Green (C.I. 42000), Victoria Blue FB
(C.I.44045), methyl violet FN
(C.I. 42535), Rhodamine F4G (C.I.
45160), Rhodamine 6GCP (C.I. 4516)
And basic dyes such as 0). The pigments, disperse pigments, and dyes may be mixed and used.

Further, various qualities of the ink, for example, the purpose of preventing ink from freezing at low temperature, preventing ink from drying with a pen tip, dispersing medium of pigment, dissolving agent of dye, dissolving / dispersing of viscosity adjusting agent, etc. It is possible to use water and conventionally known water-soluble organic solvents. Specific examples of the water-soluble organic solvent include ethylene glycol, diethylene glycol,
Triethylene glycol, propylene glycol, polyethylene glycol, hexylene glycol, 1,3-
Butylene glycol, thiodiethylene glycol, glycols such as glycerin, 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, Glycol ethers such as dipropylene glycol monoethyl ether, 2-pyrrolidone, N-methyl-
Examples include 2-pyrrolidone and triethanolamine. These water-soluble organic solvents can be used alone or in combination. The amount used is preferably 10 to 60% by weight based on the total amount of the ink composition.

Further, wetting agents such as urea, ethylene urea and thiourea, preservatives such as benzothiazoline and omadine, anticorrosives such as benzotriazole, natural polymers and synthetic high-performance pigment dispersion stabilizers. In order to fix resin such as molecules, anionic or nonionic surfactants, various pigments, etc. on the writing surface, styrene-acrylic copolymer or its alkali salt, emulsion such as vinyl acetate resin, sodium hydroxide or 2,2-aminomethyl-1,3
-Various additives such as propanediol, pH adjusting agents such as organic amines, antifoaming agents such as silicone emulsions, etc. can be used as required.

In producing the ink composition of the present invention, various conventionally known methods can be adopted. For example, when a dye or a disperse pigment is used as a colorant, water and alka gum are put into a stirrer such as a Henschel mixer, and the mixture is stirred, then the remaining components are put therein, and the mixture is further stirred to obtain the mixture. You may perform filtration etc. as needed. When a pigment is used as a colorant, it can be easily obtained by previously dispersing the pigment with a dispersing machine such as a ball mill, a bead mill, a roll mill or the like to form a dispersed pigment, and then performing the same as above.

[0022]

The pigment used for obtaining the glittering handwriting has a larger particle size than general pigments, and the larger the particle size, the stronger the glittering property. However, if it is too large to be used for a ballpoint pen, it becomes difficult to eject the pigment, that is, the ink from the pen tip.
There are several factors to control the discharge,
As one of them, there is a method of controlling a radial groove provided on the seat surface in the ball chip. The larger the groove width, the larger the ejection amount. However, if the groove width is too large, air will enter from the pen tip due to the impact on the ballpoint pen when the pen tip is pointing up without the cap,
It will push the ink to the rear edge. Therefore,
It is indispensable to control the grain size and the groove width in a well-balanced manner. In the case of a glittering pigment such as a glass flake pigment or a metal vapor-deposited inorganic pigment, the particle size is 5 to 45 μm as the minimum required size for sufficiently imparting the glittering property. Width 0.1
It is a well-balanced state that the design is made to be not less than 00 mm and not more than 0.149 mm, so that ink leakage does not occur and necessary and sufficient ejection can be obtained.

[0023]

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples. The basic shape will be described with reference to the drawings. FIG. 1 is a vertical sectional view of an example of the ballpoint pen of the present invention. Generally, it is a so-called refill, which is housed in an exterior body (not shown) in a replaceable manner. The ball-point pen tip 1 is a hollow pipe obtained by cutting a polypropylene resin extruded product into an appropriate length as an ink tank 2, and is connected to one end of the hollow pipe through a tip holder 3. The inner hole 3a of the tip holder 3 is connected to the ink 4 in the ink tank 2, and is also connected to the ink 4 in the ballpoint pen tip 1 described later. The rear end of the ink tank 2 is an open system, and air is replaced in the tank according to the consumption amount of the ink 4 to maintain the internal pressure, but leakage from the rear end of the ink 4 is suppressed. for,
A backflow preventer composition 5 which is a viscous fluid is arranged. The backflow preventer composition 5 moves following the ink interface accompanying ink consumption.

As shown in FIG. 2, which is a longitudinal sectional view of the main part of the ball-point pen tip 1, the ball-point pen tip 1 has a ball holder 7 made of stainless steel which holds a ball 6 made of carbide as a writing member. The balls 6 may be made of ceramic or the like, and the ball holder 7 may be made of an alloy such as brass or nickel silver, and the surface thereof is metal-plated or coated in consideration of ink repellency and slipperiness with respect to the paper surface. Is also good.
The ball holder 7 has an inner hole 8 as an ink passage, and a tip opening 8a thereof is provided after the ball 6 is installed.
The diameter of the ball 6 is reduced to less than the diameter of the ball 6 to prevent the ball 6 from coming off.

As shown in FIG. 3 which is a sectional view taken along the line AA 'of FIG. 2 (balls 6 are omitted), the inner hole 8 has a plurality of inward projections 9 (five shown). Are formed in a radial pattern and serve as a rearward movement restricting portion of the ball 6. Radial grooves 10 are formed between the inner protrusions 9,
It communicates with the substantially circular center hole 11. In FIG. 4, the radial groove 10 communicates with the rear hole 12, but the radial groove 10
Can also be set up in the middle of the center hole 11. Further, a ball seat 13 having substantially the same curvature as that of the ball 6 is provided on the tip end surface of the inward projecting portion 9 to smoothen the rotation of the ball 6, but it is arranged as necessary and is not provided. May be. Also, although not shown, as a ballpoint pen tip,
In order to prevent ink from leaking from the gap between the ball holder 7 and the tip opening 8a of the ball holder 7, an elastic repellent agent such as a coil spring is arranged in the ball holder 7 to move the ball 6 into the ball holder 7. It is also possible to make circumferential contact with the inner edge portion of the tip opening.

As an example of the present invention, a ball-point pen tip (chip 1) having a radial groove width (dimension H in FIG. 3) provided on the seat surface in the ball tip of 0.10 mm.
Then, a ballpoint pen tip (chip 2) having a groove width of 0.12 mm and a ballpoint pen tip (chip 3) having a groove width of 0.14 mm were produced, and each was designated as chips 1 to 3.

As a comparative example, a ball-point pen tip having a radial groove width of 0.08 mm formed on the seat surface is a chip 4, a groove width 0.15 mm is a chip 5, and a groove width is 0.15 mm. Was manufactured to be 0.20 mm as a chip 6. In each of the Examples and Comparative Examples, the writing ball was made of a cemented carbide with a diameter of 1.0 mm, and a stainless steel ball holder was used.

An example of the ink used in the present invention was prepared as follows. In addition, in each of the production examples, simply "part" means "part by weight".

Ink 1 Crystal Star GF1145 (silver glass flake pigment, manufactured by Toyo Aluminum Co., Ltd., particle size: 40 μm) 3.00 parts Sandye Super Blue 1808 (blue pigment dispersion, manufactured by Sanyo Dye Co., Ltd., particle size: 0. 2 μm) 2.10 parts Alkam gum (manufactured by Hakuto Co., Ltd.) 0.18 parts ethylene glycol 8.00 parts Johncryl 450 (styrene acrylic copolymer emulsion, manufactured by Johnson Polymer Co., Ltd.) 6.00 parts TL-10 (Nonionic surfactant, manufactured by Nikko Chemicals Co., Ltd.) 1.00 part Water 79.52 parts Proxel GXL (1,2-benzisoisothiazolin-3-one, manufactured by ICI Japan Co., Ltd.) 0.20 parts Among the ingredients, 10 with alka gum and water with a homomixer
The rest of the above components were added to the aqueous solution of the alka gum obtained by stirring for 1 minute, and the mixture was further mixed and stirred for 30 minutes to obtain an ink having a handwriting appearance in which a silver-based brilliance was scattered on a blue background.

Ink 2 ULTIMICA SB-100 (silver-colored pearl pigment (metal-deposited inorganic pigment), manufactured by Nikko Kogyo Co., Ltd., particle size 5 to 30 μm) 4.00 parts FUJI SP BLACK 8948 (black pigment dispersion, Fuji) Pigment Co., Ltd., particle size 0.2 μm 2.00 parts Alkam gum 0.20 parts Ethylene glycol 10.00 parts Glycerin 10.00 parts Jonkuryl 1535 (styrene acrylic copolymer emulsion, manufactured by Johnson Polymer Co., Ltd.) ) 5.00 parts TSA739 (silicone emulsion, manufactured by GE Toshiba Silicone Co., Ltd.) 0.20 parts water 68.40 parts Proxel GXL 0.20 parts The same components as in Ink 1 are used to prepare a silver-based black material. An ink composition having a handwriting appearance with scattered brilliance was obtained.

Ink 3 Iriodin 121 (silver white pearl pigment, manufactured by Merck Japan Ltd., particle size 5 to 20 μm) 8.00 parts Water RED # 2 (red dye, manufactured by Orient Chemical Industry Co., Ltd.) 7.50 parts Kelzan AR (xanthan gum, Sansan Co., Ltd.) 0.80 part Glycerin 7.00 parts Water 71.40 parts TSA732 (silicone emulsion, GE Toshiba Silicones Co., Ltd.) 0.10 parts Movinyl DM872 (acrylic co-weight) Combined emulsion, manufactured by Hoechst Synthetic Co., Ltd. 5.00 parts Proxel GXL 0.20 parts 1 part of the above components with Kerzan AR and water with a homomixer
The remaining components described above were added to the Kelzan AR aqueous solution obtained by stirring for 0 minutes, and the mixture was further stirred for 30 minutes to obtain an ink having a silvery white glossy handwriting appearance on a red background.

Ink 4 Metashine REFSX-2025PS (silver glass flake pigment, manufactured by Toyo Aluminum Co., Ltd., particle diameter 25 μm) 10.00 parts Sandye Super Green 1713 (green pigment dispersion, manufactured by Sanyo Dye Co., Ltd., particle diameter) 0.2 μm) 1.70 parts Kerzan AR 0.75 parts water 81.15 parts NP-15 (nonionic surfactant, manufactured by Nikko Chemicals Co., Ltd.) 1.20 parts Movinyl DM 875 (styrene-acrylic copolymer) Emulsion, Hoechst Synthetic Co., Ltd. 5.00 parts Proxel GXL 0.20 parts The above components were used as ink 3 to obtain an ink having a silvery glossy handwriting appearance on a green background.

Ink 5 Ink 1 was prepared in the same manner as Ink 1 except that Crystal Star GF1145 was changed to Crystal Star GF150 (silver glass flake pigment having a particle size of 150 μm).

Ink 6 Ink 2 was obtained in the same manner as Ink 2 except that ULTIMICA SB-100 was replaced with ULTIMICA SE-100 (silver pearl pigment having an average particle size of 60 μm).

[0035]

The chips 1 to 6 and the inks 1 to 6 described above were tested as ballpoint pens of Examples and Comparative Examples according to the combinations shown in Table 1. The results are shown in Table 1.

[0036]

[Table 1]

(Preparation of test ballpoint pen) As a test ballpoint pen, a refill of hybrid (product code K105) manufactured by Pentel Co., Ltd. was used, but only the ballpoint pen tip was obtained from the above chips 1 to 6 made of stainless steel. I replaced it with a chip. About 0.8 g of each of the prepared inks 1 to 6 was filled into the refill, and centrifugal force was applied to remove air bubbles in the ink to obtain a test ballpoint pen.

(Evaluation of Distortion of Handwriting Width) Immediately after the above-mentioned test ballpoint pen was formed, a 10 cm straight line was drawn on a writing paper. The handwriting width was measured at 4 points every 2 cm from the beginning of writing. In addition, if a discontinuous portion or a thin portion appeared on the writing line, the length of that portion was measured. As the writing paper, high quality paper (JIS P3201 Writing paper A) was used.

(Evaluation of Ink Leakage) The above-mentioned ballpoint pen for testing was placed with the pen tip facing upward without capping, repeatedly dropped 5 times from 10 cm above the high-quality paper, and then left with the pen tip facing upward. Then, it was visually observed whether ink leaked from the rear end of the ink containing portion.

As described above in detail, the ball-point pen according to the present invention uses ink containing a pigment having a relatively large pigment particle size, causes ink leakage due to an impact when the tip of the pen is pointing upwards, and causes damage when writing. It is possible to suppress the disturbance of the handwriting width due to the transfer of a large amount of ink to the writing surface.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 12, 2001 (2001.11.
12)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example.

FIG. 2 is an enlarged vertical sectional view of a main part.

FIG. 3 is a sectional view taken along the line A-A ′ of FIG.

[Explanation of symbols] 1 ballpoint pen tip 2 ink tank 3 chip holder 3a inner hole 4 ink 5 Backflow prevention composition 6 balls 7 ball holder 8 inner hole 8a Tip opening 9 Inward protrusion 10 radial grooves 11 center hole 12 rear hole 13 ball seat

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C350 GA03 HA10 KA10 NA10 NA11                 4J039 AB01 BA06 BA25 BD03 BE01                       CA03 CA06 GA27

Claims (4)

[Claims] 1. A ball-point pen in which a ball-point pen tip provided with a radial groove provided in a ball holder of a ball-holding portion is connected to an ink tank for directly containing a water-based ink in a free state, wherein the radial groove of the ball-point pen tip is connected. A ballpoint pen having a groove width of 0.100 mm or more and 0.149 mm or less. 2. The ballpoint pen according to claim 1, wherein the water-based ink contains at least a pigment having an average diameter of 5 to 45 μm in a length of a maximum particle diameter. 3. The ballpoint pen according to claim 1, wherein the water-based ink contains at least one of a glass flake pigment and a metal-coated inorganic pigment. 4. The ballpoint pen according to claim 1, wherein the water-based ink contains a polysaccharide and / or a derivative thereof.