JP2021121500A - Writing instrument - Google Patents

Abstract

To provide a writing instrument that is easy to use because the thickness of a writing line can be easily changed.SOLUTION: There is provided a writing instrument having a barrel 10 housing writing ink, and a writing portion 14 attached to one end of the barrel 10. The writing portion 14 guides the writing ink from the barrel 10, and a writing body 16 capable of writing is composed of a flat surface portion, a corner portion, and a curved surface portion.SELECTED DRAWING: Figure 1

Description

The present invention relates to a writing instrument that enables writing from a container containing liquid writing ink through a writing unit. More specifically, the present invention generally relates to a type of liquid writing tool called an oil-based marking pen, a water-based marking pen, an underline pen, and the like.

Conventionally, a writing instrument that is easy for a user to use has been disclosed in which a writing portion is provided at the tip of a holding body having visibility as shown in Patent Document 1 so that the writing direction can be visually recognized through the holding body at the time of writing. ..

Japanese Unexamined Patent Publication No. 2000-52682

However, in the invention disclosed in Patent Document 1, the writing core, which is the writing part, has a flat surface in contact with the paper surface, and when writing differently, the thickness of the writing line at the time of writing may be changed. It is necessary and may impair usability.

Therefore, it is an object of the present invention to provide a writing instrument that is easy to use and that it is easy to write different writing lines even in a writing instrument that writes by a writing unit via a visual recognition unit.

The present invention relates to a writing instrument having a barrel containing writing ink and a writing portion attached to one end of the barrel.
The writing unit has a cursive that can be written by guiding writing ink from the barrel and a holding body that holds the writing body, and the holding body is formed of a material having visibility, and the writing body is said to be. Is a writing instrument characterized by having a plurality of flat surfaces.
Further, it is preferable that the plurality of flat surfaces are formed with a flat surface portion, a corner portion and a curved surface portion.

In the present invention, it is preferable that the holding body is arranged on the outer periphery of the writing portion, rib bodies on uneven surfaces are formed on the outer peripheral surface of the holding body, and the writing body is provided between the rib bodies.
Further, the holder has a wall thickness of 1 mm or more in a cross section perpendicular to the axial direction, or the ratio of the outer diameter of the cursive to the outer diameter of the holder is 1: 3 or more. Is preferable.

The cursive is preferably made of a nylon resin having a porosity of 60% or more. The porosity can be measured with a mercury press-fitting type pore distribution measuring device (POREMASTER series manufactured by Kantachrome Instruments Japan Co., Ltd.).

The writing ink preferably contains trimethylglycine and pentaerythritol.

According to the writing instrument of the present invention, the writing portion is composed of a writing body capable of guiding writing ink from a barrel and a holding body holding the writing body, and the holding body is formed of a material having visibility. It is possible to provide an easy-to-use writing tool that can achieve an excellent effect that when writing with the writing tool, it is easy to write the writing lines separately without changing the writing tool because the writing part has a plurality of planes. can. Further, since the cursive is formed of a nylon resin having a porosity of 60% or more and the writing ink contains trimethylglycine and pentaerythritol, the drying property of the writing line is improved, so that a more convenient writing instrument is provided. be able to.

It is explanatory drawing of the cosmetic tool which concerns on 1st Embodiment of this invention, (a) is a front view, (b) is a front view rotated 90 ° from (a), (c) is C- It is a vertical sectional view along the C line. It is an enlarged view of the writing part in the makeup tool of FIG. 1, (a) is a view from the other side, and (b) is a perspective view of the tip part. It is a parts view of the cosmetic occlusion body in the writing part of the cosmetic tool of FIG. 1, (a) is a perspective view, (b) is a perspective view from the front side, (c) is a view from above, and (d) is a side view. Front view from the side, (e) is a cross-sectional view along the line EE of (c), (f) is a view from below, (g) is a view from the rear, and (h) is an enlarged tip. It is a perspective view. It is explanatory drawing of each part of the cosmetic occlusion body in the writing part of the cosmetic tool of FIG. Is an enlarged perspective view, and (d) is a front view from the plane portion side. It is a component drawing of the support member (holding body) of the cosmetic tool which concerns on 1st Embodiment, (a) is a view seen from the other side, (b) is a perspective view from the other side, (c) is a front view, ( d) is a plan view, (e) is a back view, (f) is a vertical sectional view along the FF line of (d), (g) is a rear view, and (h) is a perspective view from the rear. Is. It is explanatory drawing of the writing instrument which concerns on 2nd Embodiment of this invention. It is a component drawing of the ink storage body for writing in the writing part of the writing instrument of FIG. 6, (a) is a perspective view, (b) is a view from the front, (c) is a view from above, (d) is a side. Front view from the side, (e) is a cross-sectional view along the line EE of (c), (f) is a view from below, (g) is a view from the rear, and (h) is an enlarged tip. It is a perspective view. It is explanatory drawing of the cosmetic tool which concerns on 3rd Embodiment of this invention, (a) is a front view, (b) is a front view rotated 90 ° from (a), (c) is C- It is a vertical sectional view along the C line.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In any of the embodiments, a cap (not shown) for protecting the writing portion is detachably attached to the tip of the shaft cylinder.

[Cosmetics of the first embodiment]
1 to 5 are explanatory views of a cosmetic tool according to the first embodiment of the present invention.

FIG. 1 is an overall view of the cosmetic tool according to the first embodiment of the present invention.
As shown in FIG. 1 (c), the writing instrument is a type in which a writing ink occlusion body 12 is housed in a shaft cylinder 10 which is a writing instrument main body, and liquid writing ink is stored in the writing ink occlusion body 12. belongs to. The shaft cylinder 10 has a tubular shape with a closed rear end. Inside the rear portion of the barrel 10, ribs 10a for supporting the writing ink storage body 12 are formed so as to project inward.
The reference numeral LD in FIG. 1B indicates the longitudinal direction (axial direction) of the barrel 10.

The writing tool has a structure in which a writing ink occlusion body 12 is connected to the rear end of the writing unit 14 to supply the liquid writing ink of the writing ink occlusion body 12 to the writing unit 14.

2 (a)-(b) show an enlarged view of the periphery of the writing portion 14 at the tip of the writing instrument. Further, FIGS. 3 (a)-(h) and 4 (a)-(d) show a writing ink guiding unit (corresponding to a "cursive" and also referred to as a "writing core") 16. 5 (a)-(h) is a component diagram of a support member (corresponding to a "holding body") 18 to which the writing ink guiding portion 16 is mounted.

In the writing unit 14 of the first embodiment, as shown in FIGS. 2A-(b), the writing ink guiding unit 16 which is a cursive is arranged on the outer circumference of the supporting member 18, and the supporting member 18 is formed. It has a structure that holds the writing ink guiding portion 16. The writing portion 14 in a state where the writing ink guiding portion 16 is held by the support member 18 is attached to the tip end portion of the shaft cylinder 10 by a tubular tip shaft 20.

In the mounted state, the writing portion 14 is arranged in a state in which about half of the writing ink guiding portion 16 and the support member 18 are projected from the tip end portion of the tip shaft 20 and exposed. The tip shaft 20 has a tubular shape, and the tip portion of the writing ink storage body 12 is internally provided therein, and is attached to the tip portion of the shaft cylinder 10. The space between the tip opening of the front shaft 20 and the writing portion 14 is closed by the flange portion 18b (the air flow grooves 18h and 18j are exposed) of the support member 18, and the main body portion 18a is the front shaft. 20 The writing portion 14 is prevented from coming off by fitting into the tip opening. The portion (visible portion 18c) in which the writing ink guiding portion 16 is installed is transparent or translucent around the main body portion 18a of the support member 18, so that the writing target portion can be visually recognized.

The writing ink storage body 12 is impregnated with a fluid writing ink such as a water-based writing ink, and is, for example, a natural fiber, an animal hair fiber, a polyacetal resin, an acrylic resin, a polyester resin, or a polyamide resin. , Polyurethane-based resin, polyolefin-based resin, polyvinyl-based resin, polycarbonate-based resin, polyether-based resin, polyphenylene-based resin, and other fiber bundles consisting of one or more combinations, processed fiber bundles such as felt, etc. Further, it contains a porous body such as a sponge, resin particles, and a sintered body. The writing ink occlusion body 12 is housed in the main body of the barrel 10. The rear end side of the barrel 10 is closed to prevent the ink from volatilizing from the writing ink occlusion body 12, but if the rear end side is open, it may be sealed with a tail plug or the like. ..

Further, as shown in FIGS. 1 (c) and 2 (b), the writing ink guiding portion 16 which is a cursive has a substantially U-shape so as to surround a substantially rectangular support member 18. ..

Further, in the first embodiment, as shown in FIG. 3A, the writing ink guiding portion 16 has a shape in which a strip-shaped body having a substantially circular cross section is bent, and a flat surface portion is formed on the surface of the writing side top portion. It has 16b, a corner portion 16a, and a curved surface portion 16c.

The writing ink guiding portion 16 has two corner portions 16a and curved surface portions 16c that are bent by approximately 90 ° at two locations on the tip side. Further, four cut-off flat surface portions 16b are formed at the corner portions 16a. The periphery of the flat surface portion 16b and the joint portion are chamfered with an R of about 0.2 mm. Further, the writing ink guiding portion 16 is formed with a curved surface portion 16c bent in the radial direction. Further, the cross section of the tip (the region between the corners 16a and 16c) of the writing ink guiding portion 16 is irregular, and the cross section is circular from the central portion to the rear portion.

Specifically, as shown in FIGS. 4A and 4C, the writing ink guiding portion 16 is formed with four flat surfaces 16b. Since the four flat surfaces 16b are gathered at the corners 16a, the writing ink guiding portion 16 is located from the curved surface 16c to the flat surface 16b as shown in FIGS. 4A and 4C. A wide portion of the width W1 that can be written or drawn with the thickness of the above is formed, a medium width portion of the width W2 sandwiched between two flat surface portions 16b, and a narrow portion of the width W3 are formed. It is preferable that the width W1 is 1 to 3 mm (mm), the width W3 is 0.5 to 1.5 mm (mm), and the width W1: width W3 = 2: 1.

By forming the four flat surfaces in this way, the writing ink guiding portion 16 has the flat surface portion 16b, the corner portion 16a, and the curved surface portion 16c, so that the writing ink guiding portion 16 gradually becomes thinner from the thick portion. As described above, the pen core width is formed so as to be gradually narrowed along the ridgeline (contour) of the flat surface portion 16b in the vicinity of the corner portion 16a.

The specific writing ink guiding portion 16 preferably has a thickness of 1.0 to 3.0 mm (mm).

The support member 18 according to the first embodiment will be described in detail with reference to the parts drawings of FIGS. 5A to 5H.
As shown in FIG. 1B, the support member 18 fixes the writing ink guiding portion 16 to the periphery and is fixed to the tip opening of the front shaft 20 of the barrel 10.
As shown in FIGS. 5A to 5H, the support member 18 includes a substantially bulging main body portion 18a, a flange portion 18b having an annular diameter expanded on the front side of the main body portion 18a, and a flange portion. It has a transparent and visible portion 18c having a structure extending from 18b to a substantially plate-like tip so that the writing direction can be visually recognized. Further, the support member 18 is provided with a rear holding portion 18e having a holding piece 18d connected to the main body portion 18a on the rear side of the main body portion 18a. Further, a holding groove 18f for fitting and holding the U-shaped writing ink guiding portion 16 is formed on the entire outer peripheral surface of the support member 18 composed of each of these portions in the longitudinal direction.

Further, a concave or convex fitting portion 18g for fitting on the inner circumference of the front shaft 20 is formed on the outer peripheral surface in the width direction of the main body portion 18a, and a flange portion 18b is formed on the outer peripheral surface in the longitudinal direction. Air flow grooves 18h and 18j for air replacement having a concave cross section are formed on the outer peripheral surface extending from the holding piece 18d. The structure is such that air flows with the outside air in the barrel 10 via the air flow grooves 18h and 18j. Due to the structure, when the writing unit 14 is used for writing, the writing ink stored in the writing ink occlusion body 12 can be replaced with air.

The support member 18 according to the embodiment is a member such as a transparent resin or glass whose writing direction can be visually recognized, specifically, a parallel light transmittance of 30% or more, preferably a parallel light transmittance of 50% or more, more preferably. It is a member such as transparent resin or glass having a parallel light transmittance of 70% or more, and a visible portion 18c which is a wide smooth surface is formed in the front and a main body portion 18a is formed in the rear. A member such as resin or glass having a parallel light transmittance of less than 30% is not preferable because the writing direction cannot be clearly seen. Examples of the resin and the like satisfying this physical property include styrene-isoprene resin, ionomer resin, SBR-PP blend resin, acrylic resin, nylon resin, polymethylpentene, PC (polycarbonate), transparent ABS resin and the like.

The writing ink guiding portion 16 is made of a polymer foam such as a sponge, a porous rubber body used for a penetrating mark, a non-woven cloth, a felt, a fiber bundle hardened with a resin, or a metal or ceramic. It is composed of a porous member such as a polymer sintered body. In particular, by forming it with a nylon resin having a porosity of 60% or more, it is possible to improve the dryness of the drawn lines written on the paper surface or the like, and it is possible to improve usability. These porous members (also in the following cases) are covered on the outer periphery of the support member 18 by fitting, bonding with an adhesive, welding, or the like. A fitting groove or the like may be provided on the outer peripheral surface of the support member 18 in order to further secure the coating of the writing ink guiding portion 16.

Further, in the writing portion 14, the writing ink guiding portion 16 at the front portion wraps around the support member 18 integrally with the same material and is covered by the front shaft 20 in the above-described manner, and the rear portion is inside the front shaft 20. It is possible to sneak into the tip of the writing ink occlusion body 12 and supply the writing ink to the writing ink guiding portion 16 from there.

As shown in FIG. 1 (b), the tip of the writing portion 14 (the tip of the writing ink guiding portion 16) is at an angle of 40 to 90 ° with respect to the longitudinal LD of the barrel 10 (main body axis). It is desirable that it is tilted, and in this embodiment, it is tilted at 75 °. These shapes are appropriately set according to the usability of writing and the like.

The writing section 14 has a thick drawing line width, preferably a drawing line width of 1 mm or more, and more preferably a drawing line width of 3 mm or more.

The writing ink guiding portion 16 is formed so that the tip portion of the support member 18 is exposed from the tip shaft 20.

Further, in the support member 18, if the visible portion 18c is composed of a lens member having a lens effect (the same applies in the following cases), the see-through field of view can be enlarged and viewed.

Needless to say, in the writing instrument having the writing unit 14 of the first embodiment, the writing unit 14 can be suitably applied to the writing unit for fine writing and the bold writing type writing instrument.

In the writing instrument having the writing unit 14 of the first embodiment, when writing from left to right with the right hand on the writing instrument having the writing unit 14 having a wide drawing line width, the support member 18 is made of a member such as transparent resin or glass. Since the visible portion 18c is provided, the visible portion 18c located directly above the longitudinal LD of the barrel 10 of the writing portion 14 makes it easier to see the right side of the writing destination, and the position of the target portion can be easily specified.

As a result, it is possible to significantly improve usability when painting the target surface with the above-mentioned writing tool or when using it in a relatively narrow place.

[Writing tool of the second embodiment]
Next, the writing tool according to the second embodiment of the present invention will be described.

The writing instrument according to the second embodiment of the present invention has the structures shown in FIGS. 6 to 7, and the writing instrument of the first embodiment shown in FIGS. The form of the part (corresponding to "cursive", also called pen core) is significantly different. Others are the same as the writing tool according to the first embodiment, and the same reference numerals are given to the same parts.

In the writing instrument according to the second embodiment, the writing ink guiding portion 16 has a larger curvature of the curved surface portion 16c than that of the first embodiment or the like.
The writing ink guiding portion 16 shown in FIG. 7 draws a large arc as compared with the curved surface portion 16c of FIG. Further, the cross section of the tip (the region between the corners 16a and 16c) of the writing ink guiding portion 16 is irregular, and the cross section is circular from the central portion to the rear portion.
Therefore, when writing, the difference between the writing width of the curved portion 16c and the writing width of the corner portion 16a is emphasized, and sharp writing becomes possible. Other actions / effects are the same as those in the first embodiment.

In the above-described embodiment, various shape structures of the writing ink guiding portion 16 have been illustrated, but this is an example, and it goes without saying that various other shapes and structures can be taken. In the second embodiment, the support member has a pentagonal cross section, but a polygonal cross section shape other than the hexagonal cross section can be used. Further, the structure may be a support member having a different cross-sectional shape in the length direction.
Further, in the writing instrument of the second embodiment, the writing ink guiding portion 16 supported so as to surround the support member 18 is linear and its cross section is substantially circular, but the cross section may be substantially polygonal. ..

[Writing tool of the third embodiment]
Next, the writing tool according to the third embodiment of the present invention will be described.

8 (a)-(c) are drawings showing a writing tool according to a third embodiment, (a) is a front view, (b) is a rotated front view, and (c) is (a). It is a cross-sectional view taken along the line CC.

The writing instrument of the present embodiment is a pen type, and as shown in FIG. 8C, includes a shaft cylinder 10 as a writing instrument main body, an ink occlusion body 12 for writing, a relay porous body 30, and a writing unit 14A. ing.

The shaft cylinder 10 is made of, for example, a synthetic resin, rubber, or elastomer, and houses a writing ink occlusion body 12 impregnated with writing ink for writing instruments, and a tip to which the writing portion 14A is fixed is attached to the tip portion. A shaft 20 is provided. The shaft cylinder 10 and the toe shaft 20 have the same other configurations as those in the first embodiment.

The writing ink occlusion body 12 is impregnated with a fluid writing ink such as a water-based writing ink, and the same material as the writing ink occlusion body 12 of the first embodiment can be used. The writing ink occlusion body 12 is housed in the main body of the barrel 10. Although the rear end side of the barrel 10 is closed, it may be sealed with a breech plug formed of the same material as the barrel 10 or a different synthetic resin material.

The relay porous body 30 serves as a relay core for supplying the writing ink of the writing ink storage body 12 to the writing ink guiding portion 16A provided on the support member 18A (corresponding to the “holding body”) described later. Similar to the writing ink storage body 12, a fiber bundle core obtained by processing a fiber bundle such as a fiber bundle or felt, or a continuous pore (flow) such as a resin particle porous body made of a hard sponge or a resin particle sintered body, or a sliver core If the writing ink impregnated in the writing ink storage body 12 can be supplied to the writing ink guiding portion 16A of the support member 18A via the relay porous body 30, the writing ink having the path) is provided. The shape, structure, etc. are not limited. Examples of the cross-sectional shape of the relay porous body 30 include a circle, an ellipse, a square, a rectangle, a trapezoid, a parallelogram, a rhombus, a kamaboko shape, and a crescent shape. In the present embodiment, the cross-sectional shape is a circular shape. It has become. As shown in FIG. 8, the relay porous body 30 of the present embodiment has a structure of being held by the support member 18A fitted in the leading shaft 20.

The writing unit 14A includes a writing porous body 22 that serves as a writing body, and a support member 18A that holds the writing porous body 22 and has a writing ink guiding portion 16A for supplying writing ink to the writing unit. There is.

The writing porous body 22 which is the writing body of the present embodiment is fixed to the tip of the support member 18A, and is, for example, natural fiber, animal hair fiber, polyacetal resin, polyethylene resin, acrylic resin, polyester. Parallel fiber bundles, felts, etc. made of one or more combinations of one or more kinds of based resin, polyamide resin, polyurethane resin, polyolefin resin, polyvinyl resin, polycarbonate resin, polyether resin, polyphenylene resin, etc. It is composed of a fiber core obtained by processing a fiber bundle or processing these fiber bundles with a resin, or a porous body (sintered core) obtained by sintering various plastic powders or the like. In particular, by forming it with a nylon resin having a porosity of 60% or more, it is possible to improve the dryness of the drawn lines written on the paper surface or the like, and it is possible to improve usability.

Examples of the shape of the writing porous body 22 serving as the writing portion include a chisel shape, a bullet shape, a cylinder, an elliptical column, a cube, a rectangular parallelepiped, and the like, and the cross-sectional shape thereof is a trapezoid, a parallelogram, and the like. Shapes such as a shape, a rhombus, a cuboid shape, and a crescent shape can be mentioned, and in the present embodiment, the shape 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 writing porous body 22 to be a cursive is preferably 40 to 90 with respect to the longitudinal LD (FIG. 8 (b)) of the barrel 10 (main body axis) so as to have an inclination that facilitates writing. It is desirable that it is tilted at an angle of °, and in this embodiment, it is tilted at 75 °.

The shape, inclination, and the like of the writing porous body 22 serving as these cursive bodies are appropriately set according to the usability of writing and the like. The writing perforated body 22 to be a cursive has a thick drawing line width, and is preferably a writing portion having a drawing line width of 2 mm or more, and more preferably a drawing line width of 3 mm or more.

The support member 18A of the present embodiment is made of a material having visibility, for example, PP, PE, PET, PEN, nylon (including amorphous nylon in addition to general nylon such as 6 nylon and 12 nylon), and 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 target portion 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 determined by measuring the reflectance using a multi-light source colorimeter [multi-light source spectrophotometer (MSC-5N) manufactured by Suga Test Instruments Co., Ltd.].

The support member 18A 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.

Inside the support member 18A, at least one writing ink guiding portion 16A such as a communication hole for supplying writing ink to the writing portion is provided, and in the present embodiment, the area ratio of the visible portion is maximized. As shown in FIG. 8C, writing is performed along the longitudinal LD in the center of the writing section 14A from the point of being able to exert the limit and efficiently supplying the writing ink to the writing porous body 22 which is the writing body. One ink guiding portion 16A is provided so as to penetrate through the ink guiding portion 16A.

Regarding the shape, size, etc. of the writing ink guiding portion 16A, the writing ink impregnated in the writing ink occlusion body 12 included in the writing instrument main body is directly supplied to the writing ink guiding portion via the relay porous body 30. As long as it has a structure that can be formed, its shape, structure, size, number, and the like can be appropriately selected. Preferably, from the viewpoint of maximizing the effect of the present invention, the length W (FIG. 8 (c)) of the writing ink guiding portion 16A in the cross-sectional width direction is the length X of the major axis of the writing destination (FIG. 8). It is desirable that it is less than 40%, more preferably 1 to 30% of (c)), and the cross-sectional area of the writing ink guiding portion 16A is the cross-sectional area of the holding body 18A of the writing portion 14A on the narrow side. It is desirable that it is less than or less than the cross-sectional area of the relay porous body 30.

In particular, from the viewpoint of ensuring a sufficient writing flow rate without impairing the visibility of the holder, the length W in the width direction of the cross section of the writing ink guiding portion 16A is 3 mm or less, preferably 0.1 to 2 It is preferably a tube with a diameter of 0.1 to 3.0 mm, preferably 0.2 to 2.5 mm in diameter, and more preferably 0.2 to 2.0 mm in diameter. .. Further, the total cross-sectional area of the writing ink guiding portion 16A inside the support member 18A is 0.01 to 7 mm ² , preferably 0.03 to 5 mm 2, and more preferably 0.03 to ⁴ mm ^2. Is desirable.

Further, the writing ink guiding portion 16A preferably has a taper formed toward the writing porous body 22 side of the writing body, and is 0 to 0 with respect to the major axis direction LD of the barrel 10 (main body axis). A plurality of two or more may be provided in an orientation of 30 °, but it is desirable that only one is provided. Further, the shape of the writing ink guiding portion 16A is preferably a straight line with respect to the LD in the long axis direction, but it should be V-shaped, X-shaped, Y-shaped, spiral-shaped, inverted V-shaped, or inverted Y-shaped. It can also be made into a shape that is easy to see.

As a method for forming the writing ink guiding portion 16A having the above structure, for example, a resin is poured into a mold provided with a rod-shaped body for forming the writing ink guiding portion, and the resin is molded by various molding methods such as injection molding. A method of forming the writing ink guiding portion 16A on the support member 18A by die cutting, a method of forming the writing ink guiding portion 16A by drilling, laser processing, etc. after forming the supporting member 18A, and using the supporting member 18A as two members. , A method of forming a groove for forming the writing ink guiding portion 16A in each of the two, and then integrating these by adhesion, welding, or the like to form the writing ink guiding portion 16A on the support member 18A, and the like. It can be formed in the same manner as described in.

Preferably, the writing ink guiding portion 16A provided inside the support member 18A has a visible light transmittance of less than 50% in a state where the writing ink described later is contained, does not function as a visible portion, and does not function as a visual viewing portion, and is in the writing direction. It is desirable that is not effectively visible. In some cases, if the writing ink guide unit 16A is visible with the writing ink in it, the use of the coloring component of the writing ink is restricted, and the writing ink color corresponding to the needs is restricted. Is not obtained, which is not preferable. In such a case, a pipe colored with substantially the same color as the writing ink for the writing instrument may be inserted into the writing ink guiding portion 16A so that the writing ink color can be easily discriminated. Further, the writing ink guiding portion 16A may be a space portion in the support member 18A instead of the above-mentioned parts.

Further, the portion of the support member 18A other than the writing ink guiding portion 16A serves as a surface forming the visual recognition portion, and it is desirable that the support member 18A has a substantially parallel surface in order to effectively visually recognize the writing direction. It is also possible to magnify the visual recognition portion as a lens surface for visual recognition.

In the present invention, the adhesion between the writing porous body 22 as the writing body and the support member 18A having the writing ink guiding portion 16A firmly fixes the writing porous body 22 in a state where the sealing performance is imparted. Therefore, the resin forming the retainer from the support member 18A enters the unevenness of the pores of the writing porous body 22 in the portion where the writing porous body 22 and the support member 18A are in contact with each other to form the retainer resin layer. It is desirable that the writing porous body 22 and the support member 18A are fixed.

The material forming the writing porous body 22 and the support member 18A is preferably selected from resins having different solubilities in solvents. For example, the writing porous body 22 is made of a polyethylene sintered core, and the holding body is made of acrylic. If this is the case, the difference in solubility parameter (SP value) between the porous resin and the retainer resin can be 0.5 or more as the solvent, so alcohol, ester (butyl acetate), ether, ketone (acetone), A writing porous body that becomes the above-mentioned writing body by using an organic solvent such as glycol ether, alicyclic hydrocarbon, aliphatic hydrocarbon, chloride aliphatic hydrocarbon (dioxide), aromatic hydrocarbon, chloride aromatic hydrocarbon, etc. 22 and the support member 18A having the writing ink guiding portion 16A can be fixed.

Preferably, the end surface of the writing ink guiding portion 16A on the writing porous body 22 side is formed on the interface between the writing porous body 22 and the support member 18A by a retainer resin layer (“the retainer resin layer on the interface is adhered”. It is desirable that the adhesive surface has a length of 0.5 mm or more, more preferably 0.8 to 3 mm in all directions of the end surface.

This adhesive surface can be formed on any of a flat surface, a curved surface, and a bent portion, and the adhesive surface of the writing ink guiding portion 16A on the writing porous body 22 side has an adhesive surface of 0.5 mm over the entire circumference of the end surface. As described above, more preferably, it is preferably formed in an amount of 0.8 to 3 mm.

Further, it is desirable that the holding resin layer on the adhesive surface is formed in an amount of 1 to 1000 μm, more preferably 10 to 800 μm toward the inside of the writing porous body 22, and a support member in contact with the writing porous body 22. It is desirable that the surface of the local peak of the contact portion of 18A is satin finished by embossing or the like.

In the writing portion 14A, the rib body 18A1 (FIG. 8 (a)) is placed on the upper portion of the supporting member 18A from the viewpoint of firmly fixing the writing porous body 22 serving as the writing body and the support member 18A having the writing ink guiding portion 16A. ) Are provided on two or more of the side surfaces of the writing porous body 22, and two are provided in the present embodiment.

Further, the adhesive surface between the writing porous body 22 and the support member 18A having the writing ink guiding portion 16A has two surfaces inside the side surface of the rib body 18A1 and a bottom surface portion excluding the opening of the writing ink guiding portion 16A. It is a flat surface that serves as an adhesive surface. Further, the surface of the local peak of the contact portion of the support member 18A that comes into contact with the written porous body 22 is in a satin finish due to embossing or the like. In the writing portion 14A, the writing porous body 22 and the support member 18A can be fixed by two-color molding or the like.

In the present embodiment configured as described above, the writing porous body 22 and the supporting member 18A are brought into contact with each other to adhere the writing porous body 22 serving as the writing portion and the support member 18A having the writing ink guiding portion 16A. The resin that forms the retainer from the support member 18A enters the unevenness of the pores of the writing porous body 22 in the portion where the writing portion is located, and the retainer resin layer is formed on the bottom surface thereof to form the writing porous body 22 that serves as the writing portion. A writing tool having excellent durability can be obtained, which can be reliably fixed to the support member 18A having the writing ink guiding portion 16A and can secure a sufficient writing flow rate until the end of writing.

Further, in the present embodiment, the relay porous body 30 and the support member 18A can be bonded by forming a holding body resin layer or the like in the same manner as described above.

Specifically, the adhesive surface on the relay porous body 30 side is formed on any of a flat surface, a curved surface, and a bent portion, and the relay porous body 30 side end surface of the writing ink guiding portion 16A has a hollow rear portion of the support member 18A. A retainer resin layer (also referred to as "adhesive surface on the relay porous body side") is formed on the boundary surface of the relay porous body 30 inserted between the openings so as to have a thickness of 0.5 mm or more over the entire circumference of the relay porous body 30. The peripheral resin layer on the side adhesive surface is 1 to 1000 μm toward the inside of the porous body, and the surface of the local peak of the contact portion at the rear of the support member 18A that contacts the relay porous body 30 is textured or the like. It is in a satin state.

In the present embodiment configured as described above, the relay porous body 30 and the support member 18A having the writing ink guiding portion 16A are adhered to each other, and the relay porous body 30 and the support member 18A are in contact with each other. The resin forming the retainer from the support member 18A enters the unevenness of the pores of the body 30, and the retainer resin layer is formed to form the relay porous body 30 and the support member 18A having the writing ink guiding portion 16A. Can be reliably fixed, and a sufficient flow rate can be supplied to the writing ink guiding unit 16A, resulting in excellent durability. Further, the holder resin layer may be formed on the entire portion where the relay porous body 30 is press-fitted and the support member 18A and the relay porous body 30 are in contact with each other.

In the writing tool of the present embodiment, as described above, the writing unit 14A holds the writing porous body 22 to be the writing body and the writing porous body 22, and the writing ink for supplying the writing ink to the writing unit 14A. It is provided with a support member 18A having at least one guide portion 16A, and is a relay perforation for supplying the writing ink contained in the shaft cylinder 10 of the writing tool to the writing ink guide portion 16A provided on the support member 18A. Since the support member 18A has the body 30 and is made of a material having visibility, the entire surface (whole) other than the writing ink guiding portion 16A of the support member 18A can visually recognize the writing direction. With this structure, for the first time, the area ratio of the visible portion can be set to 40% or more of the writing portion 14A protruding from the tip of the main body of the barrel 10, preferably the writing portion 14A. The visible portion on the side surface of the support member 18A is also 40% or more, and the writing ink guiding portion 16A is formed in the central portion in the longitudinal direction of the supporting member 18A, and the length and diameter of the writing ink guiding portion 16A in the width direction. By appropriately setting the cross-sectional area and the like within the above-mentioned preferable range, the area ratio of the visible portion can be further increased to 50% or more, and a writing instrument that can be used until the end of painting is provided. In particular, by forming the writing ink guiding portion 16A in the central portion of the support member 18A along the longitudinal direction, the writing ink can be efficiently supplied to the writing porous body 22 serving as the writing portion. Further, a writing instrument that can be used until the end of painting will be provided.

Further, by forming the writing ink guiding portion 16A in the central portion of the support member 18A along the longitudinal direction, the writing direction can be easily determined and the shape becomes very easy to write.

Furthermore, by providing a mechanism in which the liquid is directly supplied to the writing ink guiding portion 16A, the writing ink can be efficiently supplied to the writing porous body 22 which is the writing portion. When a porous body is used as the writing ink guiding portion 16A, a suitable writing ink flow rate may not be obtained.

The writing tool of the present invention is not limited to the above, and various modifications can be made without changing the gist of the present invention. The shape of the writing ink guiding portion 16A may be a character shape such as a V-shape, an X-shape, a Y-shape, a spiral shape, an inverted V-shape, or an inverted X-shape.

[Explanation of writing ink]
Next, the writing ink used for the writing instrument according to the embodiment will be described.
The writing ink composition of the present invention comprises a reversible heat consisting of (a) an electron-donating color-developing organic compound, (b) an electron-accepting compound, and (c) a reaction medium that determines the occurrence temperature of both of the color reactions. The microcapsules are composed of a reversible thermochromic microcapsule pigment containing a discoloring composition, microcapsule particles having a different specific gravity from the reversible thermochromic microcapsule pigment, and a vehicle containing water and a polymer flocculant. The component contained in the capsule particles is contained in the reversible thermochromic microcapsule pigment (b) an electron-accepting compound and (c) a reaction medium that determines the occurrence temperature of the color reaction of both, and has a surface tension of 30. A thermochromic ink in the range of ~ 40 mN / m and containing trimethylglycine and pentaerythritol.

A thermochromic ink maintains a predetermined color (first color) at room temperature (for example, 25 ° C.), changes to another color (second color) when the temperature is raised to a high temperature discoloration temperature, and then a low temperature. An ink having the property of returning to the original color (first color) when cooled to the recoloring temperature. Generally, the second color may be colorless, and the drawn line drawn with the first color (for example, red) may be heated to make it colorless. Therefore, the drawn line is rubbed against the written paper surface or the like by the shaft cylinder 10 or a cap (not shown), which is a friction body, to generate frictional heat, thereby changing the drawn line to colorless. As a matter of course, the second color may be a color other than colorless. By setting the high-temperature discoloration temperature in the range of 60 to 80 ° C and the low-temperature recoloring temperature in the range of -20 to 0 ° C, and specifying the difference between the high-temperature discoloration temperature and the low-temperature recoloring temperature in the range of 60 to 100 ° C, it is normal (daily). It can be effectively used to maintain the color exhibited in the living temperature range). Further, since the shaft cylinder 10 and the cap can be easily functioned as a friction body by forming the shaft cylinder 10 and the cap with a viscoelastic material, for example, an olefin elastomer, it is possible to provide a writing tool that is easy to use.

Specific examples of compounds will be given for each of the components (a), (b), and (c). The component (a) of the present invention, that is, the electron-donating color-forming organic compound, includes diphenylmethanephthalides, phenylindrillphthalides, indolylphthalides, diphenylmethaneazaphthalides, and phenylindrillazaphthalide. , Fluorans, stirinoquinolins, diazarhodamine lactones and the like, and these compounds are exemplified below. 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide, 3- (4-diethylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) phthalide, 3,3 -Bis (1-n-butyl-2-methylindol-3-yl) phthalide, 3,3-bis (2-ethoxy-4-diethylaminophenyl) -4-azaphthalide, 3- [2-ethoxy-4- ( N-Ethylanilino) phenyl] -3- (1-ethyl-2-methylindol-3-yl) -4-azaphthalide, 3,6-diphenylaminofluorane, 3,6-dimethoxyfluorane, 3,6-di -N-Butoxyfluorane, 2-methyl-6- (N-ethyl-N-p-tolylamino) fluorane, 3-chloro-6-cyclohexylaminofluorane, 2-methyl-6-cyclohexylaminofluorane, 2- (2-Chloroanilino) -6-di-n-butylaminofluorane, 2- (3-trifluoromethylanilino) -6-diethylaminofluorane, 2- (N-methylanilino) -6- (N-ethyl-) N-p-tolylamino) fluorane, 1,3-dimethyl-6-diethylaminofluorane, 2-chloro-3-methyl-6-diethylaminofluorane, 2-anilino-3-methyl-6-diethylaminofluorane, 2- Anilino-3-methyl-6-di-n-butylaminofluorane, 2-xylidino-3-methyl-6-diethylaminofluorane, 1,2-benz-6-diethylaminofluorane, 1,2-benz-6 -(N-Ethyl-N-isobutylamino) fluorane, 1,2-benz-6- (N-ethyl-N-isoamylamino) fluorane, 2- (3-methoxy-4-dodecoxystyryl) quinoline, spiro [5H- (1) benzopyrano (2,3-d) pyrimidin-5,1'(3'H) isobenzofuran] -3'-on, 2- (diethylamino) -8- (diethylamino) -4-methyl- , Spiro [5H- (1) benzopyrano (2,3-d) pyrimidin-5,1'(3'H) isobenzofuran] -3'-on, 2- (di-n-butylamino) -8-( Di-n-butylamino) -4-methyl-, spiro [5H- (1) benzopyrano (2,3-d) pyrimidin-5,1'(3'H) isobenzofuran] -3'-on, 2- (Di-n-butylamino) -8- (diethylamino) -4-methyl-, Spiro [5H- (1) benzopyrano (2, 3-d) Pyrimidine-5,1'(3'H) isobenzofuran] -3'-one, 2- (di-n-butylamino) -8- (N-ethyl-N-i-amylamino) -4 -Methyl-, spiro [5H- (1) benzopyrano (2,3-d) pyrimidin-5,1'(3'H) isobenzofuran] -3'-on, 2- (di-n-butylamino)- 8- (Di-n-butylamino) -4-phenyl, 3- (2-methoxy-4-dimethylaminophenyl) -3- (1-butyl-2-methylindol-3-yl) -4,5 6,7-Tetrachlorophthalide, 3- (2-ethoxy-4-diethylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) -4,5,6,7-tetrachlorophthalide Do, 3- (2-ethoxy-4-diethylaminophenyl) -3- (1-pentyl-2-methylindol-3-yl) -4,5,6,7-tetrachlorophthalide and the like can be mentioned. .. Further, pyridine-based, quinazoline-based, bisquinazoline-based compounds and the like, which are effective for expressing fluorescent yellow to red color development, can be mentioned.

The electron-accepting compound of the component (b) includes a group of compounds having an active proton, a group of pseudo-acidic compounds (a group of compounds that are not acids but act as acids in the composition to develop the color of component (a)), and electrons. There are a group of compounds having pores and the like. Examples of compounds having an active proton include monophenols to polyphenols as compounds having a phenolic hydroxyl group, and alkyl groups, aryl groups, acyl groups, alkoxycarbonyl groups, carboxy groups and esters thereof as their substituents. Alternatively, those having an amide group, a halogen group and the like, bis-type and tris-type phenols and the like, phenol-aldehyde condensed resins and the like can be mentioned. Further, it may be a metal salt of the compound having a phenolic hydroxyl group.

Specific examples are given below. Phenol, o-cresol, tertiary butylcatechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, n-butyl p-hydroxybenzoate , P-Hydroxybenzoate n-octyl, resorcin, dodecyl carbate, 2,2-bis (4-hydroxyphenyl) propane, 4,4-dihydroxydiphenylsulfone, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-Bis (4-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfide, 1-phenyl-1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4) -Hydroxyphenyl) -3-methylbutane, 1,1-bis (4-hydroxyphenyl) -2-methylpropane, 1,1-bis (4-hydroxyphenyl) n-hexane, 1,1-bis (4-hydroxy) Phenyl) n-heptane, 1,1-bis (4-hydroxyphenyl) n-octane, 1,1-bis (4-hydroxyphenyl) n-nonane, 1,1-bis (4-hydroxyphenyl) n-decane , 1,1-bis (4-hydroxyphenyl) n-dodecane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) ethyl propionate, 2,2-bis (4-Hydroxyphenyl) -4-methylpentane, 2,2-bis (4-hydroxyphenyl) hexafluoropropane, 2,2-bis (4-hydroxyphenyl) n-heptane, 2,2-bis (4-hydroxyphenyl) Hydroxyphenyl) n-nonan and the like. The compound having a phenolic hydroxyl group can exhibit the most effective thermal discoloration property, but is an aromatic carboxylic acid and an aliphatic carboxylic acid having 2 to 5 carbon atoms, a carboxylic acid metal salt, an acidic phosphoric acid ester and theirs. It may be a compound selected from a metal salt, 1,2,3-triazole and a derivative thereof.

The component (c) of the reaction medium that reversibly causes the electron transfer reaction by the components (a) and (b) in a specific temperature range will be described. Examples of the component (c) include alcohols, esters, ketones, ethers, and acid amides. As the component (c), preferably, with respect to the color density-temperature curve, a large hysteresis characteristic (a curve plotting a change in coloring density due to a temperature change changes the temperature from a low temperature side to a high temperature side, and a case where the temperature is changed from a high temperature side to a low temperature side. A carboxylic acid ester compound having a ΔT value (melting point-cloud point) of 5 ° C. or higher and lower than 50 ° C., which can form a reversible thermochromic composition showing color memory, which changes color depending on the case of changing to the side). For example, a carboxylic acid ester containing a substituted aromatic ring in the molecule, an ester of a carboxylic acid containing an unsubstituted aromatic ring and an aliphatic alcohol having 10 or more carbon atoms, a carboxylic acid ester containing a cyclohexyl group in the molecule, and 6 carbon atoms. Esters of the above fatty acids and unsubstituted aromatic alcohols or phenols, esters of fatty acids having 8 or more carbon atoms and branched aliphatic alcohols or esters, esters of dicarboxylic acids and aromatic alcohols or branched aliphatic alcohols, dibenzyl silicate, heptyl stearate , Didecyl adipate, dilauryl adipate, dimyristyl adipate, disetyl adipate, distearyl adipate, trilaurin, trimyristin, tristearate, dimyristin, distearate and the like are used.

Further, a fatty acid ester compound obtained from an odd aliphatic monohydric alcohol having 9 or more carbon atoms and an aliphatic carboxylic acid having an even number of carbon atoms, n-pentyl alcohol or n-heptyl alcohol, and an even fat having 10 to 16 carbon atoms. A fatty acid ester compound having a total carbon number of 17 to 23 obtained from a group carboxylic acid is also effective. Specifically, n-pentadecyl acetate, n-tridecyl butyrate, n-pentadecyl butyrate, n-undecyl caproate, n-tridecyl caproate, n-pentadecyl caproate, n-nonyl caprylate, n-undecyl capricate, N-tridecyl caprylate, n-pentadecyl caprylate, n-heptyl caprate, n-nonyl caprate, n-undecyl caprate, n-tridecyl caprate, n-pentadecyl caprate, n-pentyl laurate, laurate n-heptyl, n-nonyl laurate, n-undecyl laurate, n-tridecyl laurate, n-pentadecyl laurate, n-pentyl myristate, n-heptyl myristate, n-nonyl myristate, n-myristate Undecyl, n-tridecyl myristate, n-pentadecyl myristate, n-pentyl palmitate, n-heptyl palmitate, n-nonyl palmitate, n-undecyl palmitate, n-tridecyl palmitate, n-pentadecyl palmitate, N-nonyl stearate, n-undecyl stearate, n-tridecyl stearate, n-pentadecyl stearate, n-nonyl eikosanate, n-undecyl eikosanate, n-tridecyl eikosanate, n-pentadecyl eikosanate, behenic acid Examples thereof include n-nonyl, n-undecyl behenate, n-tridecyl behenate, n-pentadecyl behenate and the like.

As the ketones, aliphatic ketones having a total carbon number of 10 or more are effective, and 2-decanone, 3-decanone, 4-decanone, 2-undecanone, 3-undecanone, 4-undecanone, and 5-undecanone are effective. , 2-Dodecanone, 3-Dodecanone, 4-Dodecanone, 5-Dodecanone, 2-Tridecanone, 3-Tridecanone, 2-Tetradecanone, 2-Pentadecanone, 8-Pentadecanone, 2-Hexadecanone, 3-Hexadecanone, 9-Heptadecanone, 2 -Pentadecanone, 2-octadecanone, 2-nonadecanone, 10-nonadacanone, 2-eicosanone, 11-eicosanone, 2-heneicosanone, 2-docosanone, lauron, stearone and the like can be mentioned. Also, arylalkylketones having a total carbon number of 12 to 24, for example, n-octadecanophenone, n-heptadecanophenone, n-hexadecanophenone, n-pentadecanophenone, n-tetradecano. Phenone, 4-n-dodecaacetophenone, n-tridecanophenone, 4-n-undecanoacetophenone, n-laurofenone, 4-n-decanoacetophenone, n-undecanophenone, 4-n-nonylacetophenone, n -Decanofenone, 4-n-octylacetophenone, n-nonanophenone, 4-n-heptylacetophenone, n-octanophenone, 4-n-hexylacetophenone, 4-n-cyclohexylacetophenone, 4-tert-butylpropiophenone, n-Heptaphenone, 4-n-pentylacetophenone, cyclohexylphenylketone, benzyl-n-butylketone, 4-n-butylacetophenone, n-hexanophenone, 4-isobutylacetophenone, 1-acetonaphthone, 2-acetonafton, cyclopentylphenylketone And so on.

As the ethers, aliphatic ethers having a total carbon number of 10 or more are effective, and dipentyl ether, dihexyl ether, diheptyl ether, dioctyl ether, dinonyl ether, didecyl ether, diundecyl ether, and didodecyl ether. , Ditridecyl ether, Ditetradecyl ether, Dipentadecyl ether, Dihexadecyl ether, Dioctadecyl ether, Decanediol dimethyl ether, Undecanediol dimethyl ether, Dodecanediol dimethyl ether, Tridecanediol dimethyl ether, Decanediol diethyl ether, Undecanediol diethyl ether And so on. If the average value of the maximum outer diameter of the microcapsule pigments (including those having a circular cross-sectional shape) exceeds 5.0 μm, the outflow from the capillaries tends to decrease, and the average value of the maximum outer diameter is less than 0.5 μm. Then, it becomes difficult to show high-concentration color development. When the ratio of the reversible thermochromic composition to the wall film is larger than the above range, the thickness of the wall film becomes too thin and the resistance to pressure and heat tends to decrease, and the ratio of the wall film to the reversible thermochromic composition. When is larger than the above range, the color density and sharpness at the time of color development are likely to decrease.
The average particle size was measured using a particle size measuring device N4Plus (manufactured by COOLTER). At the time of measurement, the sample was diluted with water until the recommended concentration of N4Plus was reached, and the measurement was performed under a temperature condition of 25 ° C.

The reversible thermochromic microcapsule pigment can be blended in an amount of 5 to 40% by mass, preferably 10 to 40% by mass, more preferably 10 to 30% by mass, based on the total amount of the ink composition. If it is less than 5% by mass, the color development density is insufficient, and if it exceeds 40% by mass, the ink outflow property is lowered and the writing performance is impaired.

As the medium used for the ink, water and, if necessary, a water-soluble organic solvent are used. Examples of the water-soluble organic solvent include ethanol, propanol, butanol, glycerin, sorbitol, triethanolamine, diethanolamine, monoethanolamine, ethylene glycol, diethylene glycol, thiodiethylene glycol, polyethylene glycol, propylene glycol, butylene glycol, and ethylene glycol monomethyl. Ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monobutyl ether, ethylene glycol monomethyl ether acetate, sulfolane, 2-pyrrolidone, N-methyl-2-pyrrolidone. Etc. are used. Since the specific gravity of the microcapsule pigment containing the reversible thermochromic composition having a large hysteresis width exceeds approximately 1, it is preferable that the water-soluble organic solvent to be applied exceeds 1.1.

By adding a water-soluble polymer flocculant to the ink, the flocculant causes a loose bridging action between the microcapsule pigment particles, and exhibits a loose flocculation state. Inks that exhibit such a loosely aggregated state can suppress the separation of microcapsule pigments. As the polymer flocculant, a water-soluble polymer is used, and examples thereof include polyvinylpyrrolidone, polyethylene oxide, and water-soluble polysaccharides. Examples of the water-soluble polysaccharide include traganth gum, guar gum, pullulan, cyclodextrin, and water-soluble cellulose derivative, and specific examples of the water-soluble cellulose derivative include methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, and hydroxypropyl methyl cellulose. And so on. In the reversible thermochromic water-based ink composition of the present invention, any water-soluble polymer exhibiting a loose bridging action between microcapsule pigment particles can be applied, and among them, a water-soluble cellulose derivative is effective. Function. It should be noted that two or more kinds of the polymer flocculants can be used in combination.

The ink composition has a surface tension adjusted in the range of 30 to 40 mN / m. By adjusting the surface tension within the above range, blurring when writing is less likely to occur, and even if the ink is left in a temperature range below 0 ° C where the ink freezes, or in a high temperature range, for example, an environment of 60 ° C, the ink The handwriting density and writing width are less likely to vary depending on the storage environment and usage environment without impairing the outflow property. If the surface tension is less than 30 mN / m, the ink outflow property tends to be unstable and the handwriting density becomes non-uniform. Further, when the surface tension exceeds 40 mN / m, line cracking is likely to occur, and the ink outflow amount is reduced depending on the storage environment and usage environment described above, the handwriting density is lowered, and the writing width is likely to vary. .. Further, the pH of the ink composition is preferably adjusted to 2 to 7, preferably 3 to 6, and the low temperature range of the reversible thermochromic microcapsule pigment contained by adjusting the ink composition to an acidic range. Aggregation and sedimentation can be suppressed. When the pH exceeds 7, the ink outflow property when left in a low temperature range, that is, in the temperature range where the ink freezes is likely to be impaired, and when the pH is less than 2, the reversible thermochromic composition contained in the capsule is likely to be impaired. The color development property becomes stronger, and it becomes easy to cause a problem that color residue occurs at the time of decoloring.

There is a difference in specific gravity between the reversible thermochromic microcapsule pigment and the vehicle consisting of at least water and a polymer flocculant, and the specific gravity (at the time of color development) of the reversible thermochromic microcapsule pigment is larger than the specific gravity of the vehicle. Then, the microcapsule pigment tends to settle with time, and the settling becomes a hard cake and the redispersibility becomes poor. On the contrary, when the specific gravity (at the time of color development) of the reversible thermochromic microcapsule pigment is smaller than the specific gravity of the vehicle, the microcapsule pigment tends to float with time, and the suspended matter becomes a hard cake and the redispersibility becomes poor. In order to solve the above problem, microcapsule particles having a specific gravity different from that of the reversible thermochromic microcapsule pigment are added, and when the specific gravity of the reversible thermochromic microcapsule pigment is larger than the specific gravity of the vehicle, the specific gravity is higher than that of the vehicle. Use microcapsule particles with a small specific density. When the specific gravity of the reversible thermochromic microcapsule pigment is smaller than the specific density of the vehicle, the microcapsule particles having a larger specific density than the vehicle are used. In other words, the specific density of the vehicle is present between the specific gravity of the reversible thermochromic microcapsule pigment at the time of color development and the specific density of the microcapsule particles. By adding such microcapsule particles, the mixed aggregates (reversible thermochromic microcapsule pigment and aggregates of microcapsule particles) are adjusted to the vicinity of the specific gravity of the vehicle, and the difference in specific gravity is reduced. As a result, it becomes difficult to separate the particles in the ink, and even if they are separated, they can be easily redispersed.

The microcapsule particles have the same capsule form as the reversible thermochromic microcapsule pigment, and the specific gravity can be changed depending on the type of inclusions. As the inclusions of the microcapsule particles, (b) an electron-accepting compound contained in the reversible thermochromic microcapsule pigment and (c) a reaction medium for determining the temperature at which the color reaction of both of them occur are used. The microcapsule particles can be blended in an amount of 2 to 20% by mass, preferably 5 to 20% by mass, more preferably 5 to 15% by mass, based on the total amount of the ink composition. If it is less than 2% by mass, the effect of adjusting the specific gravity is insufficient, and if it exceeds 20% by mass, the balance of the specific gravity may be impaired.

The viscosity of the ink is 1.5 to 20 mPa · s (20 ° C.), preferably 1.5 to 10 mPa · s, and if it exceeds 20 mPa · s, the ink outflow property is lowered and the handwriting is faint or interrupted. It may happen.

Further, in the writing ink, trimethylglycine [also known as glycine betaine, (CH ₃ ) ₂ N ⁺ (CH ₃ ) CH ₂ COO ⁻ ] is used to act as a moisturizing agent, etc., and the writing ink composition. Even if it is blended in the ink, the ink performance is not deteriorated, and the pen tip exhibits the drying resistance, the drawing line drying property, and the low temperature stability of the ink.

The content of this trimethylglycine is preferably 0.5 to 50%, preferably 1 to 15%, and more preferably 2 to 10% with respect to the total amount of the ink composition.
If this content is less than 0.5%, the effect of suppressing the drying of the pen tip is not sufficient, while if it exceeds 50%, the effect does not change so much, but rather the writing performance and storage stability due to the increase in viscosity. It will bring about a decline.

Furthermore, in writing ink, pentaerythritol [C (CH ₂ OH) ₄ ] is used to act as a moisturizer, etc., and when used in combination with the above-mentioned trimethylglycine, it is synergistically compared to the use of each alone. By acting, while suppressing the drying of the pen tip, it is excellent in the drying property of the drawn line and the low temperature stability of the ink, and it is possible to exhibit excellent performance without bleeding or strike-through in the drawn line.

The content of this pentaerythritol is preferably 0.5 to 8%, preferably 2 to 5%, based on the total amount of the ink composition.
If the content of this content is less than 0.5%, the effect of suppressing the drying of the pen tip is not sufficient, and the synergistic action with trimethylglycine cannot be exhibited, while it exceeds 8%. The effect of the synergistic action with trimethylglycine does not change so much, resulting in precipitation at low temperature and deterioration of storage stability.

The structure of the writing instrument used for the writing ink of the present invention is not particularly limited. Examples thereof include a direct liquid type or batting type marking pen that occludes ink for use.

A conventionally known method can be adopted for producing this writing ink, which is obtained by blending a predetermined amount of each component and the like and stirring and mixing with a stirrer such as a homomixer or a disper. Further, if necessary, coarse particles in the ink composition may be removed by filtration or centrifugation, or the ink may be produced while defoaming, heating, and cooling.

The writing ink of the present invention configured in this way is excellent in the drying property of the drawn line and the low temperature stability of the ink while suppressing the drying of the pen tip, and exhibits the function of the drawn line without bleeding or strike-through. Can be inferred as follows.
That is, in the writing ink of the present invention, both trimethylglycine and pentaerythritol are components that suppress the drying resistance of the pen tip, and they are used together in the writing ink composition rather than being used alone. By doing so, it is clear that they act synergistically. The reason is not always clear, but it is said that the synergistic effect suppresses the drying of the pen tip, while excellent in the drying property of the drawn line and the low temperature stability of the ink, and it demonstrates excellent performance without bleeding or strike-through in the drawn line. Guessed.
The writing ink of the present invention has an extremely excellent lasting effect for exerting the effect of the present invention, and the onset period and duration of the effect are long. Further, since trimethylglycine and pentaerythritol are water-soluble, aging It also has excellent stability.

The writing instrument of the present invention can be used for writing with writing ink in the writing section.

10 Shaft cylinder 10a Rib 12 Writing ink occlusion 14 Writing part (first embodiment, second embodiment)
14A Writing section (third embodiment)
16 Writing ink guide unit (cursive according to the first embodiment and the second embodiment)
16A Writing ink guide (cursive according to the third embodiment)
18 Support member (holding body according to the first embodiment and the second embodiment)
18A support member (holding body according to the third embodiment)
20 Toe shaft 22 Writing porous body

Claims (1)

The invention described in the specification.

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