JP6905342B2 - Stationery - Google Patents

Description

The present invention relates to a type of writing instrument called an underline marker or the like that supplies ink in the writing instrument body to the writing portion of the pen tip, and more particularly, to a writing instrument capable of visually recognizing the writing direction with a visual portion of the pen tip.

Generally, a writing instrument called an underline marker or the like is widely used because it is provided with a wide writing portion to enable wide drawing and is excellent in marking visibility and workability. ..

In this type of writing instrument, a writing instrument having each structure is known as a writing instrument capable of visually recognizing the writing direction with the visual recognition portion of the pen tip.
For example, the applicant has 1) a writing instrument having a pen tip provided with a visual recognition portion (window) capable of visually recognizing the writing direction, and a writing instrument having an improved area ratio of the visual recognition portion (see, for example, Patent Document 1), 2). Disclosed is a writing instrument (see, for example, Patent Document 2) that improves the area ratio of the visible portion and is less likely to cause ink shortage or blurring even if there is a strong impact due to dropping or the like.

With these writing instruments, you can see the written characters from the visual part of the pen tip, so you can draw a line only where you want to check, without sticking out.
Among the above patent documents, Patent Document 2 is an excellent writing instrument that improves the area ratio of the visible portion and is less likely to cause ink shortage or blurring even if there is a strong impact due to dropping or the like. In order to secure a sufficient amount of outflow, it is necessary to make the ink guide core thicker.

However, if the ink guide core is made thicker, the visible portion becomes smaller, which causes problems such as deterioration of the visibility of the visible portion. Further, in paragraphs [0031] and FIG. 6 of Patent Document 2, the outer shape of the ink guiding portion of the holder is made smooth convex or concave to improve visibility and design. A clarification is one in which the technical idea (configuration and its action and effect) is different.

Japanese Unexamined Patent Publication No. 2012-20575 (Claims, FIG. 1, etc.) Japanese Unexamined Patent Publication No. 2014-50970 (Claims, paragraph [0031], FIG. 6, etc.)

The present invention has been made to solve this problem in view of the above-mentioned conventional problems, and even if the ink guide core is made thicker in order to secure a sufficient amount of ink flowing out to the writing portion, the ink guide core is provided. It is an object of the present invention to provide a writing instrument having an effect of making it look thin and improving visibility at the time of writing.

As a result of diligent studies to solve the above-mentioned conventional problems, the present inventors have made a porous body in which the pen tip serves as a writing portion and an ink guiding portion for holding the porous body and supplying ink to the writing portion. The present invention has been completed by finding that a writing instrument of the above object can be obtained by providing a holder having a specific structure for making the ink guide core look thin.

That is, the writing instrument of the present invention is provided with a porous body in which the pen tip serves as a writing portion, an ink guide core for holding the porous body and supplying ink to the writing portion, and an ink guide core inside the holding body. In addition, the holding body is a writing instrument that serves as a visual viewing portion for visually recognizing the writing direction, and is characterized in that at least one groove portion for making the ink guide core appear thin is formed on the outer surface of the holding body.
It is preferable that the width of the groove portion of the holding body is the same as or wider than the outer diameter of the ink guide core in the holding body.
It is preferable that the depth of the groove portion of the holding body is formed to be 1/4 or less of the thickness.
It is preferable that the cross-sectional shape of the ink guide core is a rectangular shape or an elliptical shape.
It is preferable that the shape of the ink guide core is the same as or smaller than the side surface on the side of the visible portion where the writing direction can be visually recognized.

According to the present invention, even if the ink guide core is thickened in order to secure the amount of ink flowing out to the writing portion, the ink guide core can be made to appear thin in the groove portion, and the writing instrument has an effect of improving visibility during writing. Is provided.

(A) and (b) show an example of a state in which the cap of the writing instrument of the present invention is removed, (a) is a perspective view seen from the front side, and (b) is a 180 ° expansion of (a). It is a perspective view. (A) is a plan view central vertical sectional view of the writing instrument of FIG. 1, and (b) is a front view central vertical sectional view of (a). (A) to (f) are drawings showing an example of a holding body that holds a porous body serving as a writing portion in the writing tool of FIG. 1, and (a) is a perspective view seen from the front side, (b). Is a plan view, (c) is a perspective view seen from the rear side, (d) is a front view, (e) is a central vertical sectional view, (f) is a bottom view, (g) is a left side view, and (h). Is a right side view, (i) is a sectional view taken along line EE of (d), and (j) is a sectional view taken along line FF of (d). (A) to (g) show an example of a state in which the cap of the writing instrument of the present invention is attached, (a) is a front view, (b) is a plan view, (c) is a rear view, and (d). ) Left side view, ((e) is a perspective view seen from the front side, (f) is a right side view, and (g) is a perspective view seen from the central portion side. (A) to (h) show an example of a state in which the cap is removed from the writing tool of FIG. 4, (a) is a front view, (b) is a plan view, (c) is a rear view, and (d). ) Is a bottom view, (e) is a right side view, (f) is a perspective view seen from the front side, (g) is a right side view, and (h) is a perspective view seen from the central portion side.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 5 are drawings showing an example of an embodiment of the writing instrument of the present invention.
The writing tool A of the present embodiment is a marking pen type writing tool, and as shown in FIGS. 1, 2, 4 and 5, a shaft cylinder 10 serving as a writing tool main body (shaft portion), an ink occlusion body 20, and ink It includes an induction core 30, a pen tip 40, and a cap 60.
The shaft cylinder 10 is made of, for example, a thermoplastic resin, a thermosetting resin, glass, or the like, and has a bottomed tubular rear shaft 11 for accommodating an ink occlusion body 20 impregnated with ink for writing tools, and a pen. It has a tip shaft 15 for fixing the tip 40.

The rear shaft 11 is formed into a long bottomed elliptical cylinder (elliptical shaft) using, for example, a synthetic resin made of polypropylene or the like, and functions as a writing tool main body. The rear shaft 11 is provided with a holding member 12 formed of a holding piece for holding the rear end portion of the ink storage body 20 inside the rear end side, and the entire rear shaft and the front shaft described later are opaque or transparent (and semi-transparent). Although it is molded to be transparent), any of them may be adopted from the viewpoint of appearance and practical use. Further, the front shaft 15 is fixed to the opening 13 of the rear shaft 11 by fitting or the like.

The front shaft 15 has an annular fitting portion 16 that fits into the opening 13 of the rear shaft 11 on the rear side, and a tubular fitting portion 18 that fixes the shoulder portion 17 and the main body portion 42 of the pen tip 40 on the front side. In addition to having the above, a holding member 19 made of a holding piece for holding the front end portion of the ink storage body 20 is provided in the fitting portion 16. A fitting portion 18a is provided on the rear end side of the fitting portion 18 on the inner peripheral surface. The leading shaft 15 having this structure is formed of, for example, a synthetic resin made of polypropylene or the like.

The ink storage body 20 is impregnated with ink for writing tools such as water-based ink, oil-based ink, and heat-discoloring ink. For example, natural fiber, animal hair fiber, polyacetal resin, acrylic resin, polyester resin, and polyamide A fiber bundle composed of one or a combination of two or more kinds such as a based resin, a polyurethane resin, a polyolefin resin, a polyvinyl resin, a polycarbonate resin, a polyether resin, and a polyphenylene resin, and a fiber bundle such as felt are processed. It also contains porous materials such as sponges, resin particles, and sintered bodies. The ink storage body 20 is housed in the rear shaft 11 of the shaft cylinder 10.

The ink composition impregnated in the ink storage body 20 is not particularly limited. For example, in the case of water-based ink, the drawing line is excellent in drying property and low temperature stability of the ink while suppressing the drying of the pen tip, and the drawing line is blurred. As a water-based ink composition for writing tools without strike-through, at least a colorant, 0.5 to 50% by mass of trimethylglycine, 0.5 to 8% by mass of pentaerythritol, and 10% by mass or less of water-soluble organic substances. Examples thereof include an ink composition containing a solvent and water.
Furthermore, with a heat-discolorable ink composition that can erase the writing lines by frictional heat using an eraser or the like, the number of times of rubbing can be reduced and the color can be reliably erased without imposing an excessive burden on the hands. A thermochromic microcapsule pigment containing at least a leuco dye, a color developer and a discoloration temperature adjuster, and at least one particle selected from titanium dioxide, silica particles and silicone resin particles having an average particle diameter in the range of 50 to 1000 nm. The content of the heat-discoloring microcapsule pigment is 5 to 30% by mass based on the total amount of the ink composition, and the content of the particles is 0. Examples thereof include an ink composition having 1 to 2 and having a total content of the heat-discoloring microcapsule pigment and the particles of 60% by mass or less with respect to the total amount of the ink composition. The average particle size can be determined with a particle size analyzer [Nycrotrack HRA9320-X100 (manufactured by Nikkiso Co., Ltd.)].

The ink guide core 30 serves as a relay core that directly supplies ink to the porous body 45 that serves as a writing portion in which the ink of the ink storage body 20 is fixed to the holding body 55 of the pen tip 40, which will be described later. The structure is such that it fits into the insertion portion 21 on the front side of the 20. The ink guide core 30 is a fiber bundle core obtained by processing a fiber bundle such as a fiber bundle or felt as in the ink storage body 20, a resin particle porous body made of a hard sponge, a resin particle sintered body, or the like, a sliver core, or the like. It has continuous pores (channels) of. As long as the ink impregnated in the ink storage body 20 can be supplied to the porous body 45 as the writing portion fixed to the holding body 55 described later via the ink guide core 30, its shape, structure, etc. are particularly limited. It is not something that is done. Examples of the cross-sectional shape of the ink guide core 30 include a circular shape, an elliptical shape, a square shape, a rectangular shape, a trapezoidal shape, a parallelogram shape, a diamond shape, other square shapes, a kamaboko shape, and a crescent shape, and are preferable. It is preferable that the shape of the ink guide core 30 is the same as or smaller than the side surface on the side where the writing direction can be visually recognized, and more preferably, the shape of the ink guide core 30 is synergistic with a groove portion for making the ink guide core 30 look thinner. By forming a rectangular shape or an elliptical shape and setting the grooved side to the short axis side, the ink flow rate can be secured without hindering the visibility of the ink guiding portion 50.

As shown in FIGS. 1 to 3, the pen tip 40 includes a porous body 45 that serves as a writing portion (pen core), holds the porous body 45, and supplies ink to the writing portion. A holding body 55 having a tubular ink guiding portion 50 on which the core 30 is arranged is provided, and the holding body 55 is connected to a main body portion 42 having a tubular portion 41 into which the ink guiding core 30 is inserted on the rear side. It is set up.
A flange portion 43 is provided on the outer peripheral surface of the main body portion 42, and three fitting holding portions 41a for fitting and holding the ink guiding core 30 are predetermined at a portion where the tubular portion 41 and the ink guiding portion 50 are connected. It is provided at every interval. The three fitting holding portions 41a have a retaining structure for further preventing the ink guide core 30 from being displaced or falling off due to dropping or the like.
Further, a fitting protrusion 42a for fitting into the fitting portion 18a provided in the fitting portion 18 of the tip shaft 15 is provided on the outer peripheral surface of the main body portion 42 of the pen tip 40.

The porous body 45 serving as the writing portion is fixed to the tip end portion of the holding body 55, and is, for example, a natural fiber, an animal hair fiber, a polyacetal resin, a polyethylene resin, an acrylic resin, a polyester resin, or a polyamide resin. Process or process parallel fiber bundles consisting of one or more combinations of resins, polyurethane resins, polyolefin resins, polyvinyl resins, polycarbonate resins, polyether resins, polyphenylene resins, etc., and fiber bundles such as felt. It is made of a fiber core obtained by processing these fiber bundles with a resin, or a porous body (sintered core) obtained by sintering various plastic powders or the like.

Examples of the shape of the porous body 45 serving as the writing portion include shapes such as a chisel shape, a bullet shape, a cylinder, an elliptical pillar, a cube, and a rectangular parallelepiped, and the cross-sectional shape thereof is a trapezoid or a parallelogram. , A diamond shape, a cuboid shape, a crescent shape, and the like, and in the present embodiment, it is a chisel shape. The chisel shape is a shape in which the tip forms an inclined surface with respect to the center line of the pen shaft and the inclined surface is flat.
Further, the porous body 45 to be the writing portion is preferably tilted at an angle of 40 to 90 ° with respect to the major axis direction of the main body axis so as to be tilted so as to be easy to write. Then, the inclination is 75 °.
The shape, inclination, and the like of the porous body 45 serving as the writing portion are appropriately set according to the usability of writing and the like. The porous body 45 to be the writing portion has a thick drawing line width, preferably a drawing line width of 2 mm or more, and more preferably a drawing line width of 3 mm or more.

The holding body 55 has at least one ink guiding portion 50 for supplying ink to the writing portion, and in the present embodiment, the area ratio of the viewing portion can be maximized. From the point of efficiently supplying ink to the porous body, one ink guiding portion 50 is arranged so as to penetrate substantially the central portion in the longitudinal direction.
The shape, size, number, etc. of the ink guide portion 50 are such that the ink impregnated in the ink occlusion body 20 included in the writing instrument main body is the ink guide core 30 arranged in the tubular portion 41 and the ink guide portion 50. The shape, structure, size, number, and the like can be appropriately selected as long as the structure is such that ink can be efficiently supplied to the porous body 45 serving as the writing portion by capillary action.

In particular, it is desirable that the length of the ink guiding portion 50 in the axial direction is 3 mm or more from the viewpoint of ensuring a sufficient writing flow rate for the ink guiding core 30 and visibility through the ink guiding portion 50. Further, it is desirable that the total cross-sectional area of the ink guiding portion 50 inside the holding body 55 is 3 mm ^{2 or more.} In the present invention, even if the ink guide core 30 is made thicker (the length in the width direction, the cross-sectional area, etc. are increased), the ink guide core can be made to appear thinner in the groove portion as described later, and the visibility at the time of writing is improved. It will have the effect of causing.
The shape of the ink guiding portion 50 is preferably a straight line toward the writing portion 45 side, which is the long axis direction, but a taper may be formed, and 0 to 30 ° with respect to the long axis direction of the main body axis. In the direction of, two or more may be provided, but it is desirable that only one is provided.

In the present embodiment, there is a gap 51 between the ink guide core 30 and the ink guide portion 50, and the gap 51 is formed and connected to the porous body 45 to be the writing portion. As a result, the gap 51 is filled with ink, and the ink supply by the ink guide core 30 and the ink supply by the ink by the capillary action (direct liquid action) of the gap 51 are combined to visually recognize the remaining amount of ink. In addition, writing can be continued for a while even if the ink runs out, so the appearance can be made to look beautiful, the quality can be stabilized, and the air escape route can be secured. ing.
The ink guide core 30 may be in close contact (sealed) inside the ink guide portion 50 without forming a gap between the ink guide core 30 and the ink guide portion 50, and even in this case, the appearance is beautiful. It can be shown, and the ink of the ink storage body 20 can be efficiently supplied to the porous body 45, which is a writing portion, which is fixed to the holding body 55 of the pen tip 40, and a suitable amount of ink can be efficiently supplied.

The entire structure other than the ink guiding portion 50 on which the ink guiding core 30 of the holding body 55 is arranged forms a viewing portion, and the outer surface thereof has four surfaces in order to effectively visually recognize the writing direction. (Front, back, and each side surface) are substantially parallel surfaces except for the groove portion described later.
In the present invention, the outer shape portions 56, 56, which are the front and back surfaces of the holding body 55 except for the side surface of the ink guide portion 50, have groove portions 57, 57 for making the ink guide core 30 look thinner along the ink guide core 30. Is formed. The groove portion 57 is not particularly limited as long as it has a shape for forming an inflection point in the inner surface direction on the ink guiding portion side with respect to the outer surface to make the ink guiding core 30 look thinner, and is, for example, a V shape (V-shaped). V-grooves), R-grooves (round grooves) in which a plurality of R-planes are continuously connected, and the like, but preferably have a V-shape (V-groove) as shown in the present embodiment.

The width T1 of the groove portion 57 of the holding body 55 is the same as or wider than the outer diameter T2 of the ink guiding core 30 arranged in the ink guiding portion 50 of the holding body 55 from the viewpoint of making the ink guiding core 30 look thinner (T1). ≧ T2) is preferable, and more preferably 1.2 × T2 ≧ T1 ≧ T2.
Further, the depth D1 of the groove portion 57 formed in the holding body 55 is formed to be 1/4 or less of the thickness D2 of the holding body 55 from the viewpoint of making the ink guide core 30 look thinner and also in terms of strength and durability. It is preferable to do so.

As a method for forming the ink guiding portion 50 and the groove portion 57 having the above structure, for example, each resin such as injection molding and blow molding by pouring a resin into a rod-shaped body for forming the ink guiding portion and a mold provided with the groove portion. A method of forming an ink guiding portion 50 and a groove portion 57 in a holding body 55 after molding by a molding method, and a method of forming an ink guiding portion 50 and a groove portion 57 by drilling, laser processing, or the like after molding the holding body 55. , The holding body 55 is made into two members, and after forming a groove for forming an ink guiding portion in each member, these are integrated by adhesion, welding, etc. to form an ink guiding portion 50 in the holding body 55, and then drilling and laser processing are performed. Examples thereof include a method of forming the groove portion 57.

Further, rib bodies 58 and 58 for holding the porous body 45 to be a writing portion are provided on both side surfaces on the upper side of the holding body 55, and bottom surface portions that come into contact with the bottom surface of the porous body 45 are provided between the rib bodies. 59 is provided. An outlet of the ink guiding portion 50 is formed in the central portion of the bottom surface portion. Further, one end surface of the rib body is provided with a contact portion 59a in which the front end surface of the porous body 45 abuts, and the other end surface serves as an entrance for inserting the porous body 45.

The holding body 55 including the main body portion 42 is made of a material having visibility, for example, polypropylene, polyethylene, PET, PEN, nylon (including amorphous nylon and the like in addition to general nylon such as 6 nylon and 12 nylon). , Acrylic, Polymethylpentene, Polystyrene, ABS and the like, and preferably made of a material having a visible light transmittance of 50% or more.
When this material having a visible light transmittance of less than 50% is used, the characters written in the writing direction may not be effectively visible, which is not preferable. A material that transmits 50% or more is preferable, and if the visible light transmittance is 80% or more, the material can be visually recognized even better. The visible light transmittance can be obtained by measuring the reflectance using a multi-light source colorimeter.

The holding body 55 can be configured by using one type of each of the above materials, or two or more types of materials from the viewpoint of further improving durability and visibility, and is composed of two or more types of materials. In this case, it is preferable that at least one of them is made of a material having a visible light transmittance of 50% or more, and can be molded by various molding methods such as injection molding and blow molding.

FIG. 4 is a drawing showing an example of a state in which the cap 60 is attached in the writing tool of the present invention, and FIG. 5 is a drawing showing an example of a state in which the cap 60 is removed.
The cap 60 is detachably attached to the front shaft 15 by fitting or the like, and is composed of an inner cap portion 61 that protects the porous body 45 that serves as a writing portion and a tubular outer cap portion 62. The outer cap portion 62 has a structure in which a concave surface portion 63 having improved design is formed on the surface portion thereof. Further, the opening surface on the front side of the outer cap portion 62 has a wide opening surface so that the writing tool can be inverted on a flat surface such as a desk, and in the present embodiment, the length in the width direction is 1.5 cm and the length is long. It has an elliptical opening surface with a directional length of 2.8 cm and a wall thickness of 1 mm.
In the writing instrument A of this form, the pen tip 40 holds the ink occlusion body 20 and the ink guide core 30 in which the ink is stored in the rear shaft 11 constituting the shaft cylinder 10 of the writing instrument, and the porous body 45 serving as the writing portion is attached. , The writing instrument A can be easily manufactured by sequentially attaching the tip shaft 15 by fitting or the like.

In the writing tool A of the present embodiment configured as described above, the ink guiding portion 50 is arranged at a substantially central portion of the holding body 55, and an ink guiding core 30 impregnated with ink is arranged in the ink guiding portion 50. Therefore, the ink impregnated in the ink storage body 20 can be efficiently supplied to the porous body 45 serving as the writing portion via the ink guide core 30 by the capillary action, and the ink guide core 30 is supplied to the ink guide portion 50. By arranging the ink guide core 30, the ink guide core 30 can be easily assembled, and even if there is a particularly strong impact due to a drop impact of the writing tool or the like, the fitting holding portion 41a having the above-mentioned three-point retaining structure prevents the ink from coming off. It is possible to prevent slippage, dropout, etc., and prevent ink blurring.
According to the present invention, even if the ink guide core 30 is thickened in order to secure the amount of ink flowing out to the writing portion, the ink guide core 30 is formed by the groove portions 57, 57 formed in the outer shape portions 56, 56 of the holding body 55. A writing instrument that can be made to look thin and has an effect of improving visibility at the time of writing is provided.

In particular, by forming the ink guiding portion 50 in the substantially central portion of the holding body 55 in the longitudinal direction, ink can be efficiently supplied to the porous body 45 serving as the writing portion, so that the ink can be used until the end of writing. Possible writing tools will be provided. Further, by forming the ink guiding portion 50 at a substantially central portion in the longitudinal direction of the holding body 55, it is easy to determine the writing direction and the shape is very easy to write. Further, by providing the rib bodies 58 and 58 on the upper part of the holding body 55, it is possible to draw a straight line or the like without soiling the ruler when writing with a ruler.

The writing tool of the present invention is not limited to the above-described embodiment, and can be changed to various forms without changing the gist of the present invention.
In the writing tool A of the above embodiment, the barrel of the writing tool body is formed on an elliptical axis, but it may be a triangular shape, a deformed shape such as a quadrangular shape or more, or a perfect circular shape.
Further, in the above embodiment, the ink guide core 30 is used to supply ink from the ink storage body 20 to the porous body 45 serving as the writing portion in one component, but two components, for example, the ink storage body 20 to the tubular portion. Up to 41 may be a relay porous body, and the ink guiding portion 50 may be supplied with ink from the ink occlusion body 20 to the porous body 45 serving as a writing portion by two parts having the same ink feeding core as the ink guiding core. It is a thing.

In the above embodiment, the groove portion 57 for making the ink guide core look thin is formed on two surfaces (front surface and back surface) in the writing direction, but one surface (front surface or back surface) may be used, and the visibility is further impaired. Within the range not specified, two ink guiding portions 50 may be formed in the holding body 55, and two groove portions along the same may be formed on one surface (four on two surfaces).
Further, a groove may be formed on the side surface of the outer shape 56 which is not related to the writing direction to make the ink guide core 30 look thinner.
It may be.
Further, in each of the above embodiments, the inks for writing tools (water-based inks, oil-based inks, heat-discoloring inks) have been described, but liquid cosmetics, liquid chemicals, coating liquids, correction liquids, and the like are used, and the pen tip is used. In addition to the liquid material, for example, a porous body for a suitable coating member may be used.

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples.

[Example 1]
(Structure of writing instrument: conforming to Fig. 1 to Fig. 5)
(Composition of pen tip)
Writing part (porous body 45): PE sintered core, porosity 60%, upper side length 5 mm, lower side length 6 mm, height 3 mm, chamfered on both sides of front end face Holder 55 (including main body): ABS Made of resin, thickness: D2 = 4mm
Ink guide 50: Cylindrical shape, inner diameter: φ1.7 mm
Groove: V-shaped, width: T1 = 1.8 mm, depth D1 = 1 mm, length: 8 mm
(Structure of writing tool members other than the pen tip)
Ink guide core 30: PET fiber bundle, porosity 65%, φ1.5 (T2) mm × 35 mm
Ink storage body 20: PET fiber bundle, porosity 85%, φ15 × 55 mm
The porous body 45 and the holding body 55 were adhered by impregnating the holding body 55 with the porous body 45 from the chamfered portion side, impregnating it with an organic solvent (ethyl acetate), and drying it.

(Ink composition)
As the ink, an aqueous ink composition having the following composition (total 100% by mass) was used.
Moisturizer: Trimethylglycine (glycine betaine) 7.5% by mass
Pentaerythritol 4.5% by mass
Colorant: NKW-4805 Yellow (manufactured by Nippon Fluorescent Co., Ltd.) 40.0% by mass
Preservative: Bio Ace (manufactured by Keiai Kasei Co., Ltd.) 0.3% by mass
pH regulator: triethanolamine 1.0% by mass
Fluorine-based surfactant: Surflon 8111N (manufactured by AGC Seimi Chemical Co., Ltd.) 0.2% by mass
Water-soluble organic solvent: ethylene glycol 3.0% by mass
Water (solvent): Ion-exchanged water 43.5% by mass

Using each member of the writing instrument, the writing instrument of Example 1 according to FIGS. 1 to 5 was produced.
According to the writing instrument of the first embodiment, the ink guide portion 50 is arranged at a substantially central portion of the holding body 55, and the ink guide core 30 impregnated with ink is arranged in the ink guide portion 50. The ink impregnated in the ink storage body 20 can be efficiently supplied to the porous body 45 serving as the writing portion via the ink guide core 30 by the capillary action, and when writing is performed on the characters, When visually confirming the appearance of the other side through the visual recognition part at the time of writing, the ink guide core 30 can be seen thinly in the grooves 57 and 57, the character visibility is sufficient, it is easy to see, and the writing direction is written. I was able to write while reading certain letters.
Further, as the ink composition, a water-based ink composition containing each content of a colorant (fluorescent colorant), trimethylglycine, pentaerythritol, a water-soluble organic solvent, and water was used. While suppressing drying, it was excellent in the drying property of the drawn lines and the low temperature stability of the ink, and there was no bleeding or strike-through in the drawn lines.

Furthermore, this writing instrument is set in the automatic writing device, and according to JIS S6037, the writing angle is 65 °, the writing load is 1N, the speed is 7 cm / s, and the distance is 100 m. As a result of confirmation, it was found that there was no breakage or breakage of the porous body serving as the writing part, the writing property was good, there was no blurring of drawn lines, and the ink flow rate (2 g / 100 m) was also good.
Further, when a drop impact test was conducted in which the writing tool of Example 1 was naturally dropped on the floor from a height of 1.5 m with the writing tools parallel to each other, it was confirmed that writing was possible without ink blurring.

[Example 2]
A writing tool was produced in the same manner as in Example 1 above, except that a thermochromic ink having the following composition was used as the ink.
(Ink composition: thermochromic ink)
<Preparation of thermochromic microcapsule pigment>
1 part by mass of CVL (manufactured by Yamada Chemical Industry Co., Ltd.) as a leuco dye, 2 parts of bisphenol A as a color developer, and 24 parts of myristyl myristate as a discoloration temperature adjuster at 100 ° C. The mixture was heated and melted to obtain 27 parts of a homogeneous composition.
As a capsule membrane agent, 10 parts of isocyanate and 10 parts of polyol were added to a uniform thermal solution of 27 parts of the composition obtained above, and the mixture was stirred and mixed. Next, 60 parts of a 12% polyvinyl alcohol aqueous solution was used as a protective colloid and emulsified at 25 ° C. to prepare a dispersion. Then, using 5 parts of 5% polyvalent amine, it was treated at 80 ° C. for 60 minutes to obtain microcapsules.
The microencapsulated aqueous dispersion obtained by the above procedure was spray-dried to form a powder to produce a blue thermochromic microcapsule pigment.
This thermochromic microcapsule pigment had an average particle size of 1.6 μm, a hue (colored state, 25 ° C.) of blue, and was decolorized at 50 ° C. or higher.

As the ink, a thermochromic ink having the following composition (total 100% by mass) was used.
Adjusted thermochromic microcapsule pigment prepared above 18% by mass
Titanium oxide: TTO-55 (A) [Average particle size 153.6 nm, manufactured by Ishihara Sangyo Co., Ltd., 35% by mass dispersion] 34.3% by mass
Thickener: Xanthan gum (KELSAN S, manufactured by Sansho Co., Ltd.) 0.18% by mass
Preservative: Bioden 421 (manufactured by Nippon Soda) 0.2% by mass
pH regulator: Aminomethyl propanol 0.1% by mass
Water-soluble organic solvent: Propylene glycol 15% by mass
Water: Ion-exchanged water 32.22% by mass

When the writing instrument of Example 2 was prepared in the same manner as in Example 1 and then written, even if an ink composition having a different ink composition was used, the ink reservoir 20 was impregnated with thermal discoloration as in Example 1. The sex ink can be efficiently supplied to the porous body 45, which is the writing portion, via the ink guide core 30 by the capillary action, and when writing is performed on the characters, the ink is written on the characters, and the ink is written on the characters. When the appearance on the other side was visually confirmed, the ink guide core 30 could be seen finely at the grooves 57 and 57, the characters were sufficiently visible, and the characters were easy to see. We were able to.
Further, as the ink composition, a thermochromic microcapsule pigment containing at least a leuco dye, a color developer and a color change temperature adjusting agent, and particles such as titanium dioxide having an average particle diameter in the range of 50 to 1000 nm are included. It was confirmed that since the heat-discoloring ink containing the above-mentioned ink was used, the number of times the eraser was rubbed was small and the color could be reliably erased without imposing an excessive burden on the hands.
Further, under the same conditions as in Example 1, after writing in a straight line at a distance of 100 m with an automatic writing device, the state of the drawn line was visually confirmed. It was found that the ink flow rate (1.8 g / 100 m) was also good. Further, when a drop impact test was conducted in the same manner as in Example 1, it was confirmed that writing was possible without ink blurring.

[Example 3]
The writing tool of Example 1 was changed to the one having the following configuration, and the same ink composition as that of Example 1 was used.
(Structure of writing instrument: conforming to Fig. 1 to Fig. 5)
(Composition of pen tip)
Writing part (porous body 45): PE sintered core, porosity 50%, upper side length 5 mm, lower side length 6 mm, height 3 mm, chamfered on both sides of front end face Holder 55 (including main body): ABS Made of resin, thickness: D2 = 5mm
Ink guide 50: Cylindrical shape, diameter: φ2 mm
Groove: V-shaped, width: T1 = 2 mm, depth D1 = 1 mm, length: 8 mm
(Structure of writing tool members other than the pen tip)
Ink guide core 30: PET fiber bundle, porosity 70%, φ2 (T2) × 35 mm
Ink storage body 20: PET fiber bundle, porosity 90%, φ15 × 55 mm
The porous body was adhered by impregnating the holding body with the porous body from the chamfered portion side, impregnating it with an organic solvent (ethyl acetate), and drying it.

Using each member of the writing instrument, the writing instrument of Example 3 according to FIGS. 1 to 5 was produced.
According to the writing instrument of Example 3, similarly to Example 1, the water-based composition ink impregnated in the ink storage body 20 is efficient due to the capillary action on the porous body 45 serving as the writing portion via the ink guide core 30. Ink can be supplied well, and when writing on the characters, the appearance of the other side is visually confirmed through the visual recognition part at the time of writing, and the ink guide core is thicker than in Example 1. Even so, the ink guide cores 30 could be seen finely in the grooves 57 and 57, the character visibility was sufficient, the ink was easy to see, and the characters written in the writing direction could be read and written. Further, since the ink composition was the same as that of Example 1, the drawing line was excellent in drying property and low temperature stability of the ink while suppressing the drying of the pen tip, and the drawing line was not bleeding or strike-through.
Further, under the same conditions as in Example 1, after writing in a straight line at a distance of 100 m with an automatic writing device, the state of the drawn line was visually confirmed. It was found that the ink flow rate (2.1 g / 100 m) was also good. Further, when a drop impact test was conducted in the same manner as in Example 1, it was confirmed that writing was possible without ink blurring.

The writing instrument of the present invention can be suitably used for a type of writing instrument called an underline pen, a paint marker, an oil-based marker, and a water-based marker.

A Writing instrument 10 Writing instrument body 11 Rear shaft 15 Tip shaft 20 Ink occlusion body 30 Ink guide core 40 Pen tip 45 Writing part (porous body)
50 Ink guide 55 Holder 57 Groove

Claims (3)

A porous body whose pen tip serves as a writing portion, an ink guide core for holding the porous body and supplying ink to the writing portion, and an ink guide core inside the holding body, and the holding body is used for writing. A writing instrument that serves as a visible portion for visually recognizing the direction, in which at least one V-shaped groove portion for making the ink guide core appear thin is formed on the outer surface of the holding body, and the width of the groove portion is set on the holding body. A writing instrument characterized in that it has the same or wider outer diameter as the ink guide core. The writing instrument according to claim 1, wherein the ink of the writing instrument contains at least a colorant, trimethylglycine, pentaerythritol, a water-soluble organic solvent, and water . The ink for the writing instrument is selected from at least a heat-discoloring microcapsule pigment containing at least a leuco dye, a color developer and a discoloration temperature adjuster, and titanium dioxide, silica particles, and silicone resin particles having an average particle diameter in the range of 50 to 1000 nm. It contains one kind of particles, and the thermochromic microcapsule pigment is 5 to 30% by mass based on the total amount of the ink composition, and the content of the particles is mass with respect to the thermochromic microcapsule pigment. a 0.1 to 2 ratio, and, according to claim 1, wherein the total content of the thermochromic microencapsulated pigment and the particles is not more than 60 wt% total amount of the ink composition Writing utensils.

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