JP2023029040A - Writing refill group and writing instrument group - Google Patents

Abstract

To provide a writing refill group with which differences in ink consumption per unit writing distance can be easily recognized among multiple writing refills containing ink of the same color tone, and a writing instrument group which contains the writing refill group in barrels.SOLUTION: There is provided a writing refill 1 in which a writing part 3 is attached to one end of a transparent or translucent ink containing tube 2, and ink 6 is contained in the tube of the ink containing tube 2. In a writing refill group in which the constituent parts of the writing refill 1 are the same, and the outer diameter of the ink containing tube 2 of the writing refill 1 and the overall length of the writing refill 1 are the same, ink of the same color tone is contained in the ink containing tube 2, and the color difference (brightness) of the ink containing tube 2 varies depending on the amount of ink consumed per unit writing distance of the writing refill 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a group of writing refills and a group of writing utensils that make it possible to easily identify differences in ink consumption among a plurality of writing refills containing ink of the same hue.

For example, a writing refill (ball-point pen refill) used for a ball-point pen writing instrument is generally attached by press-fitting a ball-point pen tip as a writing part or a joint member supporting the ball-point pen tip to one end (front end) of an ink containing tube.
A transparent or translucent resin material such as polypropylene is used for the ink storage tube in order to ensure ease of molding and visibility of the amount of ink.

As a general ink storage tube molded from a resin material such as polypropylene, for example, as described in paragraph [0021] of Patent Document 1, the outer diameter is about 3 mm and the inner diameter is about 1.8 mm. I often use things.
Since the ink storage tube shown in this example is of a relatively thick type, there is a limit to the amount of ink that can be stored in the ink storage tube. As a result, there is a practical problem that a sufficient writing distance cannot be obtained.

Therefore, the present applicant has proposed a thin writing refill in which the outer diameter of the ink containing tube is approximately the same as that of the above-described conventional one and the inner diameter of the ink containing portion is enlarged. References 2 and 3 disclose.

JP-A-2000-198291 International publication WO2017/061570 International publication WO2018/180679

By the way, in this type of writing refill using the above-described ink storage tube, there are prepared ones having different ball diameters held in the writing part, and each writing refill is constant due to the difference in ball diameter. The amount of ink consumed with respect to the writing distance is different.
However, these writing refills are formed to have substantially the same size except for the tip of the writing portion.

Therefore, in order to select a desired writing refill from a group of writing refills having a plurality of writing refills with different ink consumption per unit writing distance, it is necessary to visually identify the fine writing tip, or use an ink storage tube or the like. By deciphering the character information written in small letters on the surface of the card, we have no choice but to select means such as identification.
However, it is almost difficult for a general user to determine whether or not the refill is a desired writing refill by visually recognizing the fine tip of writing (for example, the diameter of the ball). In addition, even if the character information written on the ink storage tube is deciphered, misreading is likely to occur because the character information is small, and it is practically impossible to accurately select the desired writing refill. is.

Accordingly, the present invention provides a group of writing refills which makes it possible to easily identify the difference in ink consumption per unit writing distance among a plurality of writing refills containing ink of the same hue, and a group of writing refills which are housed in a barrel. The object is to provide a group of stored writing instruments.

A writing refill group according to the present invention, which has been made to solve the above-described problems, has a writing part or a joint member for supporting the writing part attached to one end of a transparent or translucent ink containing tube, and the ink containing tube In a writing refill group in which ink is stored in a tube of the writing refill, the constituent parts of the writing refill are the same, and the outer diameter of the ink storage tube of the writing refill and the total length of the writing refill are the same, Ink of the same hue is stored in the ink storage tubes, and the color difference of each ink storage tube is different according to the ink consumption amount per unit writing distance of the writing refill.

In this case, in one preferred embodiment, the ink containing tube contains the same kind of black ink such as oily or water-based ink, and according to the ink consumption per unit writing distance of the writing refill, It is set so that the difference in lightness (L*) from the outer surface of each ink storage tube satisfies [ink thickness difference (mm)×10] or more.

In a further preferred embodiment, a backflow preventive is housed in the rear end of the ink on the other end side of the ink containing tube, and the viscosity of the backflow preventive is selected so as to vary with the inner diameter of the ink containing tube. .

A group of writing instruments according to the present invention comprises a plurality of writing instruments in which the above-described writing refills are accommodated in barrels. Combined so that the thickness of the cylinder is different.

According to the writing refill group according to the present invention described above, the ink containing tubes contain ink of the same type and the same hue, and each ink containing tube is adjusted according to the amount of ink consumed per unit writing distance of the writing refill. , the desired writing refill can be easily selected.

Further, the writing instrument group according to the present invention comprises a plurality of writing instruments in which each of the writing refills constituting the writing refill group is accommodated in a barrel, and the ink consumption per unit writing distance of the writing refill is adjusted according to the ink consumption of the writing refill. Combined so that the thickness of the cylinder is different.
Therefore, for example, the transmittance of the barrel changes, and the color difference (brightness) of each ink containing tube accommodated in the barrel also differs, so that a desired writing instrument can be easily selected.
By forming the ink storage tube to be thin, the amount of resin can be reduced, which contributes to reducing the environmental load.

1 shows an external configuration of a group of writing refills according to the present invention, and (A) to (C) show ballpoint pen refills with different ink consumption per unit writing distance. (A) to (C) are sectional views along the axial direction of each ballpoint pen refill shown in (A) to (C) of FIG. 1, (A) is a perspective view seen from the front end side, (B) is a perspective view seen from the tail end side, (C ) is a front view, and (D) is a plan view. FIG. 2 is a perspective view showing a writing instrument in which one of the ballpoint pen refills shown in FIG. 1 is accommodated in a barrel; In the writing instrument shown in FIG. 4, (A) is a plan view, (B) is a front view, and (C) is a cross-sectional view along the axial direction.

A writing refill group and a writing utensil group according to the present invention will be described based on an embodiment shown in the drawings.

<Ballpoint pen refill (writing refill group)>
First, FIGS. 1 (A) to (C) and FIGS. 2 (A) to (C) show examples of ballpoint pen refills that constitute a writing refill group, and are indicated by the same alphabetic symbols in FIGS. 1 and 2. 1 shows the same ballpoint pen refill in an external view and a sectional view.
The ball-point pen refill 1 has an ink storage tube 2 and a joint member 4 supporting a ball-point pen tip 3 serving as a writing section. A tail plug 5 is fitted and attached to the other end (rear end) of the ink containing tube 2 .

Ink 6 is stored in the ink storage tube 2 from immediately behind the joint member 4 toward the rear end side. is accommodated toward the tail plug 5 side.
A joint member 4 having a ballpoint pen tip 3 attached in advance is press-fitted to one end of the ink containing tube 2 in this embodiment. A ballpoint pen refill 1 having a ballpoint pen tip 3 attached directly to the front end of the ballpoint pen refill 1 can also be suitably employed.

In the following, for convenience of explanation, the ballpoint pen refills 1 indicated by (A), (B), and (C) in FIGS. do.
In the first to third refills, the writing balls 3a, 3b, 3c provided at the tip of each ballpoint pen tip 3 have diameters of 1.0 mm, 0.7 mm, and 0.5 mm. The ball-point pen tip 3 set to a different ink flow rate is used.
Each of the writing balls 3a, 3b and 3c is pressed toward the tip by a coil spring 3d housed in each ballpoint pen tip 3. As shown in FIG. As a result, the writing balls 3a, 3b, and 3c act to close the tip of the ball-point pen tip 3 when writing is not performed.

Also, the inner diameters of the central portion of the ink containing tube 2 in the first to third refills are different from each other, and as shown in FIG. As a result, the first to third refills 1 are set so that the amount of ink 6 reduced in the longitudinal direction of the ink containing tube 2 at the same writing distance is substantially the same.
The back portion of the ink 6 in the ink containing tube 2 is filled with an ink backflow preventing body, and the viscosity of this ink backflow preventing body depends on the inner diameter (d1, d2, d3) of the ink containing tube 2. have different viscosities. Specific examples thereof are shown in Examples 1 and 2, which will be described later. It is preferable that the viscosity of the ink backflow preventer is decreased in proportion to the inner diameter of the central portion of the ink containing tube.

The ink storage tubes 2 of the first to third refills are linearly molded from transparent or translucent polypropylene resin, and have the same outer diameter for any of the first to third refills 1. The entire lengths of the first to third refills 1 are also formed to have the same dimensions. By having the same shape, the first to third refills can be accommodated in the same common barrel of the writing instrument.

As shown in FIG. 2, since the inner diameter d1 of the ink storage tube 2 of the first refill is large, connecting portions 2a and 2b are formed at both ends thereof so as to be thicker toward the center of the shaft. It is
The inner diameter of the ink containing tube 2 for the second refill is d2, which is slightly smaller than the inner diameter of the ink containing tube 2 for the first refill. are formed.
Further, in the ink containing tube 2 of the third refill, the inner diameters of the connecting portions 2a and 2b at both ends thereof are set to d3, which is the same as the inner diameter of the central portion, and are formed in a straight shape.
With this configuration, the inner diameters of the connecting portions 2a and 2b formed at the respective ends of the ink containing tubes 2 of the first to third refills are made the same. As a result, the ink containing tubes 2 can be made to have no longitudinal directionality, and the joint member 4 and the tail plug 5 can be fitted in common.

As shown in FIG. 2, the joint member 4 has a tapered cylindrical body whose outer diameter is slightly reduced in the front half, and the ballpoint pen tip 3 extends forward. is formed with an insertion hole 4a. Further, an annular groove 4b is formed toward the rear, and an ink introduction hole 4c to the ball-point pen tip 3 is opened in the central shaft portion.
By inserting one end (front end) of the ink containing tube 2 into the annular groove 4b, the connection portion 2a of the ink containing tube 2 has an inner diameter side and an outer diameter side of the joint member 4 that are annular. It is press-fitted between the inner and outer surfaces of the groove 4b facing each other. Thereby, the mounting strength can be increased.

FIG. 3 shows a single structure of the tail plug 5 attached to the other end (rear end) of the first to third refills 1. As shown in FIG. The front half of the tail plug 5 forms a cylindrical portion 5a, the axial hole of which forms a ventilation hole 5b, and the central portion is formed with a stepped portion 5c for enlarging the diameter. In the rear half portion whose diameter is enlarged by the stepped portion 5c, three leg portions 5d divided along the circumference are formed with equal lengths along the axial direction. Arc-shaped slanted surfaces 5e slanted toward the outside of the circumference are formed at the ends, respectively. It is desirable that the tail plug 5 be made of a resin material.

The tail plug 5 is attached to the ink storage tube 2 by inserting the cylindrical portion 5a into the connection portion 2b on the rear end side of the ink storage tube 2. As shown in FIG. In this case, the tail plug 5 is positioned with respect to the ink containing tube 2 by the stepped portion 5 c coming into contact with the rear end portion of the ink containing tube 2 . In this state, the vent hole 5b provided in the tail plug 5 functions to exchange air as the amount of ink in the ink containing tube 2 decreases.
It should be noted that the leg portion 5d of the tail plug 5 and the inclined surface 5e formed at the tail end thereof may be subjected to a strong writing load or a drop impact when the ballpoint pen refill 1 is accommodated in the shaft tube described later. has a flexibility that acts to bend inward.

In the first to third refills 1 described above, when achromatic ink such as black is used as described later, the larger the ink consumption, the different the hue from the ink containing tube 2 (brightness is low).
By changing the gradation of the hue in this way, it is possible to check the cross section of the ink storage tube from the rear end by removing the tip and the tail plug of the fine ballpoint pen tip in the group of ballpoint pen refills arranged in the barrel of the same type. It is possible to intuitively judge the difference in ball diameter and pick up (select) instantly.

Assuming that the first to third refills 1 described above are used by users who are visually impaired and have difficulty in distinguishing between hues, the refills 1 are arranged between the backflow prevention member 7 and the tail plug 5 as shown in FIG. By applying a stamp 2c inside the ink storage tube 2, it is possible to further distinguish between the first to third refills.
That is, in this embodiment, the first refill has two markings 2c perpendicular to the axis, and the second refill has one marking 2c perpendicular to the axis. The third refill is not marked.

<Brightness (hue) of refill group>
Next, each refill constituting the ball-point pen refill group was divided according to the ink consumption per unit writing distance, and various characteristics including lightness (hue) were measured.

Brightness was measured by pasting five refills each having the same ball diameter on white fine paper conforming to JIS P3201, and using a device such as a color meter (SC-P, manufactured by Suga Test Instruments Co., Ltd.) to store ink. A lightness value L* was measured from the surface of a member such as a pipe.
The measurement conditions when using a color meter (SC-P, manufactured by Suga Test Instruments Co., Ltd.) in the above embodiment are as follows.
[Optical conditions] Reflection measurement; Diffuse light illumination 8° reception (based on JIS Z 8722 condition c) Trap: de: 8° (regular reflection component not included) Measurement hole: φ15 mm
[Light source field of view] D65/2
[Color system] L*a*b*c*
[Stability] ΔE*ab <0.01
[Light source] VI-LED (high color rendering white LED)

[Example 1]
Table 1 shows the results of five measurements each using two types of writing refills (ballpoint pen refills) with different ink consumption per unit writing distance. The ink consumption, the viscosity of the backflow preventive, and the measured values of brightness are average values.

[Example 2]
Five measurements were made for each of three types of writing refills (ballpoint pen refills) with different ink consumption per unit writing distance. Table 2 shows the results. The ink consumption, the viscosity of the backflow preventive, and the measured values of brightness are average values.
Each ballpoint pen refill shown in this embodiment corresponds to the first to third refills described with reference to FIGS. 1 and 2. FIG.

In both Examples 1 and 2, inks of the same type and the same hue (black) having the following composition were used.
Carbon black #25 (Mitsubishi Kasei): 10% by weight
Polyvinyl butyral (BL-S, manufactured by Sekisui Chemical): 5% by weight
Terpene phenol resin (YP90L, manufactured by Yasuhara Chemical): 8% by weight
Polypropylene glycol (average molecular weight: 4000): 5% by weight
Phosphate ester (Plysurf A208B): 1.47% by weight
Amine compound (polyoxyethylene alkylamine: AMIET105): 1.03% by weight
3-methoxybutanol: 5% by weight
3-methoxy-3-methyl-1-butanol: 64.5% by weight
The viscosity of the backflow preventive is a value measured at a shear rate of 3.8/s under an environment of 25°C.

From Tables 1 and 2, it can be seen that the lightness (L*) changes according to the ink consumption per unit writing distance of each writing refill, that is, the thickness of the ink containing tube 2 in this embodiment. Is recognized.
In each example, the difference in brightness falls within a range that satisfies the thickness difference (mm) of the ink containing tube 2×10 or more. Confirmed to be identifiable.

The above measurement results show the results of using inks having the same ink composition and having a black (achromatic) hue. In the range of inks of the same type and same hue, it is recognized that the color difference similarly changes according to the wall thickness of the ink containing tube. As a result, it was confirmed that a desired writing refill can be easily selected from the difference in color difference.

<Ink composition>
Preferred ink compositions for use in each ballpoint pen refill of the writing refill group according to the present invention include the following.

In the ink used for each ballpoint pen refill, as the main solvent (50% by weight or more of the total solvent), a solvent selected from alcohols, polyhydric alcohols, and glycol ethers having a vapor pressure of 0.001 mmHg or more at 25 ° C. was used. It is black ink. By using a specific solvent with a high vapor pressure in this way, it is possible to provide an oil-based ball-point pen with an excellent feeling of smooth handwriting. The ink composition has been developed with the aim of solving the problems peculiar to the use of such a specific solvent with a high vapor pressure. The main solvent means that it is contained in 50% by weight or more of the total solvent.

Specifically, the alcohols are aliphatic alcohols having 2 or more carbon atoms, such as ethanol, n-propanol, isopropanol, n-butanol, isobutanol, tert-butyl alcohol, 1-pentanol, isoamyl alcohol, sec- amyl alcohol, 3-pentanol, tert-amyl alcohol, n-hexanol, methyl amyl alcohol, 2-ethylbutanol, n-heptanol, 2-heptanol, 3-heptanol, n-octanol, 2-octanol, 2-ethylhexanol , 3,5,5-trimethylhexanol, nonanol, n-decanol, undecanol, n-decanol, trimethylnonyl alcohol, tetradecanol, heptadecanol, cyclohexanol, 2-methylcyclohexanol, benzyl alcohol and many other higher Alcohol etc. are mentioned.

Polyhydric alcohols include ethylene glycol, diethylene glycol, 3-methyl-1,3-butanediol, triethylene glycol, dipropylene glycol, 1,3-propanediol, 1,3-butanediol, and 1,5-pentane. Polyhydric alcohols having two or more carbon atoms and two or more hydroxyl groups in the molecule, such as diols, hexylene glycol and octylene glycol.

Glycol ethers include methyl isopropyl ether, ethyl ether, ethyl propyl ether, ethyl butyl ether, isopropyl ether, butyl ether, hexyl ether, 2-ethylhexyl ether, ethylene glycol monohexyl ether, ethylene glycol monophenyl ether, ethylene glycol mono-2- Ethyl butyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monobutyl ether, 3-methyl-3- Methoxy-1-butanol, 3-methoxy-1-butanol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, propylene glycol phenyl ether, propylene glycol tertiary butyl ether dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monobutyl ether, tetrapropylene glycol monobutyl ether and the like.

Among the solvents listed above, glycol ethers having 2 to 7 carbon atoms are particularly preferable, and the effect is particularly easy to understand. From the viewpoint of safety and oral toxicity, it is preferable to use organic solvents other than ethylene glycol derivatives and the like.
In addition to the solvents listed above, it is also possible to add the solvents listed below as long as they do not interfere with the solubility and performance of the mixture of the phosphoric acid ester and the amine compound.
Examples thereof include polyhydric alcohol derivatives, and derivatives such as sorbitan fatty acid-based, polyglycerin higher fatty acid-based, sucrose fatty acid-based, and propylene glycol fatty acid-based derivatives.

Ester solvents include, for example, propylene glycol methyl ether acetate, propylene glycol diacetate, 3-methyl-3-methoxybutyl acetate, propylene glycol ethyl ether acetate, ethylene glycol ethyl ether acetate, butyl formate, isobutyl formate, isoamyl formate, Propyl acetate, butyl acetate, isopropyl acetate, isobutyl acetate, isoamyl acetate, methyl propionate, ethyl propionate, propyl propionate, isobutyl propionate, isoamyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, methyl isobutyrate, isobutyric acid Ethyl, propyl isobutyrate, methyl valerate, ethyl valerate, propyl valerate, methyl isovalerate, ethyl isovalerate, propyl isovalerate, methyl trimethylacetate, ethyl trimethylacetate, propyl trimethylacetate, methyl caproate, capron Ethyl Acetate, Propyl Caproate, Methyl Caprylate, Ethyl Caprylate, Propyl Caprylate, Methyl Laurate, Ethyl Laurate, Methyl Oleate, Ethyl Oleate, Caprylic Triglyceride, Tributyl Acetate Citrate, Octyl Oxystearate, Propylene Various esters such as glycol monoricinolate, methyl 2-hydroxyisobutyrate, and 3-methoxybutyl acetate are included.

Specific examples of solvent diethers and diesters having no hydroxyl group in the molecule include ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, diethylene glycol dimethyl ether, and dipropylene glycol dimethyl ether.

Although the colorant (coloring material) is not limited, it is preferably used in the form of a pigment or a combination of a pigment and a dye. The use of a pigment has the effect of improving fastness. Examples of pigments include carbon black, phthalocyanine, insoluble azo such as monoazo, disazo, condensed azo, and chelate azo; Organic pigments such as dioxazine-based and isoindolinone-based pigments can be used.

In particular, carbon black should have a specific surface area as small as possible, and preferably has a specific surface area of 100 m ² /g or less as measured by the BET method. Specifically, there are #33, #32, #30, #25, CF9, etc. as Mitsubishi Kasei carbon black, and REGAL (400R, 500R, 330R, 300R), ELFTEX (8, 12) as carbon black manufactured by Cabot Corporation. ), STERLING R, etc., and Printex (45, 40, 300, 30, 3, 35, 25, 200, A, G) and SB (250, 200) manufactured by Degussa. RAVEN (1040, 1035, 1020, 1000, 890, 890H, 850, 500, 450, 420, 410, H20, 22, 16, 14) and the like.

As the pigment, it is preferable to use a pigment that is difficult to dissolve in the organic solvent to be used and has an average particle diameter of 30 nm to 700 nm after dispersion. The pigment may be added in an amount of 0.5 to 25% by weight, preferably 0.5 to 20% by weight, based on the total amount of the ink composition.

Usable pigments may be used alone or in combination of two or more. In addition, if necessary, a dispersion containing an inorganic pigment, a dye, or the like can be added to such an extent that the dispersion stability is not adversely affected. The use of dyes has the effect of providing excellent color development. Furthermore, resin emulsions obtained by polymerizing styrene, acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters, acrylonitrile, and olefin-based monomers, hollow resin emulsions that swell and become amorphous in ink, Alternatively, organic multicolor pigments composed of dyed resin particles obtained by dyeing these emulsions themselves with a colorant may be used.

When the coloring material used in the present embodiment is a pigment, conventionally known various methods can be employed to produce the pigment-dispersed ink composition. For example, by blending the above components and mixing and stirring with a stirrer such as a dissolver, or after mixing and pulverizing with a ball mill, roll mill, bead mill, sand mill, pin mill, etc., centrifugal separation or filtration to coarse particles of the pigment, and It can be easily obtained by removing undissolved matter and contaminant solid matter.

Dyes used in combination with these pigments are not particularly limited as long as they do not destroy the dispersion system. These dyes include direct dyes, acid dyes, basic dyes, mordant/acid mordant dyes, alcohol-soluble dyes, azoic dyes, sulfur/sulfide vat dyes, vat dyes, and disperse dyes, which are used in ordinary dye ink compositions. Any of dyes, oil-soluble dyes, food dyes, metal complex dyes, and inorganic and organic pigments used in conventional pigment ink compositions can be used. The blending amount is selected in the range of 1 to 50% by weight based on the total amount of the composition.

A resin is used when an oil-based ink composition is used. Resins used in oil-based ink compositions are added for purposes such as adjusting viscosity and improving wear at the nib, and when pigments are included, they are also used as dispersants. Examples of such resins include ketone resins, styrene resins, styrene-acrylic resins, terpene phenolic resins, rosin-modified maleic acid resins, rosin phenolic resins, alkylphenolic resins, phenolic resins, styrene-maleic acid resins, rosin-based resins, and acrylic resins. There are resins represented by resins, ureaaldehyde-based resins, maleic acid-based resins, cyclohexanone-based resins, polyvinyl butyral, polyvinylpyrrolidone, and the like.

The blending amount of these resins is preferably 1 to 30% by weight, more preferably 1 to 20% by weight. If the amount is less than 1% by weight, it becomes difficult to adjust the viscosity and wear the pen tip.

As a preferred embodiment, when a pigment is used as the colorant of the ink composition, the dispersant to be used can be selected from among the above-mentioned resins that can disperse the pigment. Any type of oligomer can be used as long as it meets the purpose. Specific dispersants include synthetic resins such as polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl butyral, polyvinyl ether, styrene-maleic acid copolymer, ketone resin, hydroxyethyl cellulose and its derivatives, styrene-acrylic acid copolymer, and PO. - Examples include EO adducts and polyester amine-based oligomers.

When the ink is an oil-based ink composition, it contains a neutralized phosphate ester. The neutralized phosphate ester has the effect of making it easier to remove ink deposits on the surface of the ball, thereby providing the effect of suppressing blurring in writing at the time of writing. It provides the effect of suppressing blurry writing when writing for a long time, and lubricating the ink transferability when writing at a low speed.

Phosphate esters used generally consist of monoesters of phosphates, diesters and a small amount of triesters, and are mainly surfactants that have two types of ester structures: aromatic and aliphatic. As for alkyl groups capable of forming a phosphate ester structure, alkyl groups obtained from natural and synthetic higher alcohols are introduced. Phosphate esters having alkyl groups of 10 to 20 carbon atoms and 0 to 50 polyoxyethylene chains are used. Phosphate esters having an alkyl group of 15 to 20 carbon atoms and 0 to 4 polyoxyethylene chains are particularly preferred. As the amine-based substance for neutralization, it is desirable to neutralize with an amine-based compound such as alkanolamine, polyoxyethylene alkylamine, amphoteric surfactant, or fatty amine-based substance.

With respect to the amount of these additives, it is preferable to add 0.01% to 15% by weight, more preferably 0.1% to 10% by weight, of the mixture obtained by neutralization with respect to the total amount of the ink composition. . Moreover, it is particularly preferably 0.1 to 8% by weight. If these are less than 0.01% by weight, the effect of facilitating removal of ink deposits on the surface of the ball is inferior. It may become easy to cause trouble.

When the ink is an oil-based ink composition, it is desirable to add polypropylene glycol. The addition has the effect of making it difficult for blurring to occur at the time of writing. This phenomenon makes it possible to suppress fading caused by repelling of the ink on the metal ball, and also to suppress fading in a short time of 1 to 20 minutes by making it difficult to form an ink film.

Polypropylene glycol having a molecular weight as large as possible is preferable because the added amount can be reduced and the drawing line drying property can be enhanced. The molecular weight (calculated molecular weight) is preferably 1,000 or more, more preferably 2,000 or more, and even more preferably 4,000 or more.

The amount of polypropylene glycol to be added is preferably 0.01 to 10% by weight, particularly preferably 0.1 to 10% by weight. Within this range, an ink that uses a pigment and dries easily is less likely to form a film of the ink on the metal ball, so that it is highly effective in preventing blurring during writing.

If the addition amount is outside this range of less than 0.1% by weight, the effect is poor and the ball may not rotate. If the number of particles increases, the dryness of drawn lines may be lowered, or strike-through may become more likely to occur.

Furthermore, in this embodiment, if necessary, a rust inhibitor, an antifungal agent, a surfactant, a lubricant, a wetting agent, or the like, which can be compatible with the ink without adversely affecting the ink, can be blended. In particular, fatty acids and the like can be suitably used as lubricants. In addition, as an additive for suppressing dryness, a non-volatile solvent or the like compatible with the main solvent can be blended as long as it does not adversely affect the characteristics of the product.

<Writing instrument group (ballpoint pen writing instrument)>
Next, FIGS. 4 and 5 show an example in which a writing instrument (ballpoint pen writing instrument) is configured by housing one writing refill (ballpoint pen refill) 1 out of the ballpoint refill group described above in the barrel. In this example, the first refill 1 shown in FIG. 1(A) is used.
The barrel 12 constituting the writing instrument 11 shown in FIGS. 4 and 5 is formed by molding a synthetic resin sheet material such as polycarbonate, polypropylene, polyethylene terephthalate, or the like. That is, a repeating pattern of a plurality of concave portions and convex portions is applied to both surfaces of the sheet material, and the shaft tube 12 is formed by welding both ends of the sheet material so that the entire sheet material has a cylindrical shape. A front joint 13 and a rear joint 14 which are cylindrically molded from a resin material are attached to both ends of the barrel 12 .

The shaft cylinder 12 is formed of two pieces of sheet material formed in a cylindrical shape as another manufacturing means, which are arranged inside and outside the cylinder with an axis parallel to the cylinder, and which have predetermined unevenness. It is formed by creases while being strongly sandwiched between rollers. Furthermore, the barrel 12 may be formed by blow molding.
The thickness of the formed shaft cylinder 12 is preferably less than 1 mm, and a thickness of 0.35 mm, for example, is also practical. Further, since the barrel 12 is manufactured from a sheet material, the thickness of the barrel 2 as a whole is substantially uniform.
The connection between the barrel 12 and the front joint 13 and the rear joint 14 is performed by adhesion or welding, for example.

According to the shaft tube 12 described above, compared to a cylindrical shaft tube having the same thickness and having no irregularities, it is hard to deform and rigid against the force applied in the direction of the central axis when held by the user. is high. In addition, the shaft cylinder 12 is thinner and lighter than a cylindrical shaft cylinder without irregularities so as to have the same rigidity against the force applied in the direction of the central axis when gripped. be. Furthermore, since the shaft cylinder 12 has a regular uneven outer peripheral surface formed by a combination of three-dimensional polygonal unit patterns, it also has a decorative effect.

Using the front joint 13 attached to the barrel 12, a conical tip 15 is detachably attached by screw connection. An opening 15a is provided at the tip of the tip 15, and the writing part (ballpoint pen tip) 3 of the ballpoint pen refill 1 appears and disappears through the tip opening 15a by a knocking operation, which will be described later.
A tubular member 16 is attached using a rear joint 14 attached to the barrel 12, and a clip 16a is formed integrally with the tubular member 16. As shown in FIG. A knock operation portion 17 is arranged at the rear end portion of the tubular member 16 in a protruding state.

FIG. 5(C) shows a cross-sectional view of the writing instrument 11 along the axial direction, and a coiled return spring 18 is mounted in the tip portion 15 described above. Therefore, by removing the tip portion 15 from the front joint 13 , housing the ballpoint pen refill 1 in the barrel 12 , and screwing the tip portion 15 to the front joint 13 , the return spring 18 can be adjusted to the joint member 4 of the ballpoint pen refill 1 . abut.
As a result, the return spring 18 applies a biasing force to the ballpoint pen refill 1 in the direction toward the rear end of the barrel 12 .

A rotor 19 is mounted in the cylindrical member 16, and a truncated conical concave portion 19a having a slope whose inner diameter decreases toward the bottom is formed at the front end of the rotor 19. The tail plug 5 of the ballpoint pen refill 1 is inserted into the recess 19a.
On the other hand, the knock operation part 17 is arranged so as to cover the shaft extending to the rear part of the rotor 19. It is arranged in a retracted position due to the biasing force.
Therefore, by knocking the knock operation portion 17, the rotor 19 and the ballpoint pen refill 1 move forward in the axial direction against the biasing force of the return spring 18. As shown in FIG.

A cam member made up of a plurality of ribs extending along the axial direction is formed in the cylindrical member 16, and together with the rotor 19 that abuts on the cam member, a rotation feeding mechanism called a well-known khan knock mechanism is provided. formed.
As a result, each time the knock operation portion 17 is knocked, the ballpoint pen refill 1 advances together with the rotor 19, and the ballpoint pen tip 3 as the writing portion protrudes from the tip opening 15a and enters a writable state together with the rotor 19. The state in which the ball-point pen refill 1 is retracted and the ball-point pen tip 3 is housed in the tip opening 15a is repeated.

When the ball-point pen tip 3 protrudes from the tip opening 15 a of the tip portion 15 and is ready for writing, the tail plug 5 is inserted into the truncated cone-shaped concave portion 19 a of the rotor 19 . When a writing load is applied in this state, the inclined surfaces 5e formed on the leg portions 5d of the tail plug 5 come into contact with the inclined surfaces of the truncated conical recesses 19a formed on the rotor 19, and the respective leg portions 5d are moved. It acts to bend in the axial direction. Thereby, the ball-point pen refill 1 is provided with a cushioning action in the axial direction.
Therefore, it has a function of preventing deformation (buckling or bending) to the thin ink storage tube 2 by making it easier to absorb the vertical load applied during writing.

According to the above-described writing instrument, the thickness of the barrel 12 can be made thinner than before, so that the writing refill 1 can be seen through the barrel 12 to some extent.
Therefore, by forming a writing utensil group (set) that adopts a combination in which the thickness of the barrel 12 is varied according to the ink consumption per unit writing distance of the writing refill 1 housed in the barrel 12, writing can be performed more efficiently. It is possible to emphasize the difference in appearance visibility between the refill groups.

1 Writing refill (ballpoint pen refill)
2 Ink storage tube 3 Writing part (ballpoint pen tip)
3a to 3c Writing ball 4 Joint member 5 Tail plug 6 Ink 7 Ink backflow prevention member 11 Writing instrument 12 Axle 13 Front joint 14 Rear joint 15 Tip 16 Cylindrical member 17 Knock member 18 Return spring 19 Rotor

Claims (4)

A writing refill in which a writing part or a joint member for supporting the writing part is attached to one end of a transparent or translucent ink containing tube, and ink is contained in the ink containing tube, wherein the composition of the writing refill is In the writing refill group in which the parts are the same and the outer diameter of the writing refill and the total length of the writing refill are the same,
A writing refill group, wherein the ink containing tubes contain ink of the same hue, and the ink containing tubes differ in color according to the amount of ink consumed per unit writing distance of the writing refill. The ink containing tubes contain black ink of the same hue, and the difference in lightness (L*) from the outer surface of each ink containing tube varies according to the amount of ink consumed per unit writing distance of the writing refill. 2. The writing refill group according to claim 1, which satisfies [ink thickness difference (mm)×10] or more. 3. A writing refill group according to claim 1 or 2, wherein a backflow preventive body is housed in the rear end portion of the ink on the other end side of the ink containing tube, and the viscosity of the backflow preventive body differs depending on the inner diameter of the ink containing tube. . A writing instrument containing the writing refill according to any one of claims 1 to 3 in a barrel, wherein the ink consumption per unit writing distance of the writing refill housed in the barrel A group of writing instruments characterized by different wall thicknesses of the cylinders.

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