JP2018030288A - Writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing instrument capable of easily changing thickness or the like of a writing drawing line and being user-friendly.SOLUTION: A writing instrument includes: a barrel 10 storing ink for writing; and a writing part 14 mounted on one end of the barrel 10. In the writing instrument, the writing part 14 guides the ink for writing from the barrel 10, and the writing body 16 capable of writing is configured by a flat surface part, a corner part 16a, and a curved face part 16c.SELECTED DRAWING: Figure 2

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 liquid writing instrument of a type called an oil-based marking pen, a water-based marking pen, or an underline pen.

  2. Description of the Related Art Conventionally, there has been disclosed a writing instrument that is easy to use for a user by providing a writing portion 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 during writing. .

JP 2000-52682 A

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

  Accordingly, an object of the present invention is to provide a writing tool that is easy to write on a writing line and that is easy to use even in a writing tool that is written by a writing unit via a visual recognition unit.

The present invention, in a writing instrument having a shaft tube containing writing ink, and a writing unit attached to one end of the shaft tube,
The writing unit has a writing body that guides the ink for writing from the shaft tube and can write 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 a writing instrument characterized by having a plurality of plane portions.
Further, it is preferable that the plurality of plane portions are formed with plane portions, corner portions, and curved surface portions.

In the present invention, it is preferable that the holding body is disposed on the outer periphery of the writing portion, an uneven rib body is formed on the outer peripheral surface of the holding body, and the writing body is provided between the rib bodies.
Further, the thickness of the holder in the cross section perpendicular to the axial direction is such that the thickest part is 1 mm or more, or the ratio of the outer diameter of the writing body to the outer diameter of the holder is 1 to 3 or more. Is preferred.

  The cursive body is preferably formed of a nylon resin having a porosity of 60% or more. The porosity can be measured with a mercury intrusion type pore distribution measuring device (POREMASTER series manufactured by Cantachrome Instruments Japan).

  The ink for writing is preferably one containing trimethylglycine and pentaerythritol.

  According to the writing instrument of the present invention, the writing unit is composed of a writing body capable of writing writing ink from the shaft tube and capable of writing, and a holding body for holding the writing body, and the holding body is formed of a material having visibility. To provide an easy-to-use writing instrument that has an excellent effect that when writing with the writing instrument, the writing part has a plurality of planes, and it is easy to separate the writing lines without changing the writing instrument. it can. In addition, the writing body is formed of nylon resin having a porosity of 60% or more, and the writing ink contains trimethylglycine and pentaerythritol, so that the drying property of the writing line is improved. be able to.

It is explanatory drawing of the cosmetics which concern on 1st Embodiment of this invention, (a) is a front view, (b) is the front view rotated 90 degrees from (a), (c) is C- of (a). It is a longitudinal cross-sectional view which follows a C line. It is an enlarged view of the writing part in the cosmetics of FIG. 1, (a) is a perspective view from the front, (b) is a perspective view of a front-end | tip part. It is a component figure of the cosmetics occlusion body in the writing part of the cosmetics of FIG. 1, (a) is a perspective view, (b) is a view from the front, (c) is a view from above, (d) is a side view (E) is a cross-sectional view taken along line EE in (c), (f) is a view from below, (g) is a view from the rear, and (h) is an enlarged view of the tip. FIG. It is explanatory drawing of each part of the cosmetics occlusion body in the writing part of the cosmetics of FIG. 1, (a) is a perspective view from the front, (b) is an enlarged view from the side, (c) is a plane part side vicinity. (D) is the front view from the plane part side. It is a component figure of the support member (holding body) of the cosmetics concerning a 1st embodiment, (a) is a figure seen from the tip, (b) is a perspective view from the tip, (c) is a front view, d) is a plan view, (e) is a back view, (f) is a longitudinal sectional view taken along line FF in (d), (g) is a view seen from the rear, and (h) is a perspective view from the rear. It is. It is explanatory drawing of the writing instrument which concerns on 2nd Embodiment of this invention. It is a component figure of the ink occlusion 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, and (d) is a side view. (E) is a cross-sectional view taken along line EE in (c), (f) is a view from below, (g) is a view from the rear, and (h) is an enlarged view of the tip. FIG. It is explanatory drawing of the cosmetics which concern on 3rd Embodiment of this invention, (a) is a front view, (b) is the front view rotated 90 degrees from (a), (c) is C- of (a). It is a longitudinal cross-sectional view which follows a 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 unit is detachably attached to the tip of the shaft tube.

[Cosmetics of First Embodiment]
1-5 is explanatory drawing of the cosmetics which concern on 1st Embodiment of this invention.

FIG. 1 is an overall view of a cosmetic device according to a first embodiment of the present invention.
As shown in FIG.1 (c), the said writing instrument is the type by which the ink storage body 12 for writing is accommodated in the shaft cylinder 10 used as a writing instrument main body, and the ink for liquid writing is stored in the ink storage body 12 for writing. belongs to. The shaft cylinder 10 has a cylindrical shape with a closed rear end. A rib 10a for supporting the writing ink occluding member 12 is formed in the rear portion of the shaft tube 10 so as to protrude inward.
In addition, the code | symbol LD of FIG.1 (b) has shown the longitudinal direction (axial direction) of the axial cylinder 10. FIG.

  The writing instrument is configured to connect the writing ink storage body 12 to the rear end of the writing section 14 and supply the liquid writing ink of the writing ink storage body 12 to the writing section 14.

  FIGS. 2A and 2B show an enlarged view of the vicinity of the writing unit 14 at the tip of the writing instrument. 3 (a)-(h) and FIGS. 4 (a)-(d) show a writing ink guiding portion (corresponding to “writing body”, also referred to as “writing core”) 16. FIG. FIGS. 5A to 5H are component diagrams of a support member (corresponding to a “holding body”) 18 on which the writing ink guiding portion 16 is mounted.

  As shown in FIGS. 2A to 2B, the writing unit 14 according to the first embodiment includes a writing ink guiding unit 16 that is a writing body on the outer periphery of the support member 18, and the support member 18 has the support member 18. In this structure, the writing ink guiding portion 16 is held. 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 distal end portion of the shaft tube 10 by a cylindrical tip shaft 20.

  In the mounted state, the writing part 14 is disposed in a state in which about half of the writing ink guiding part 16 and the support member 18 protrude from the tip part of the tip shaft 20 and are exposed. The tip shaft 20 has a cylindrical shape, and a tip portion of a writing ink occluding body 12 is housed inside and is attached to the tip portion of the shaft tube 10. In addition, a space between the tip opening of the front shaft 20 and the writing portion 14 is blocked by a flange portion 18b (air flow grooves 18h and 18j are exposed), which will be described later, of the support member 18, and the main body portion 18a is The writing part 14 is prevented from coming off by fitting into the opening of the 20 tip. The portion (visible portion 18c) where the writing ink guiding portion 16 is installed around the main body portion 18a of the support member 18 is transparent or translucent, and the writing target portion is visible.

  The writing ink occlusion body 12 is impregnated with fluid writing ink such as water-based writing ink. For example, natural fiber, animal hair fiber, polyacetal resin, acrylic resin, polyester resin, polyamide resin. , A polyurethane resin, a polyolefin resin, a polyvinyl resin, a polycarbonate resin, a polyether resin, a fiber bundle composed of a combination of two or more of a polyphenylene resin, or a fiber bundle such as felt, Moreover, porous bodies, such as sponge, a resin particle, a sintered compact, are included. The writing ink occlusion body 12 is accommodated in the main body of the shaft tube 10. The rear end side of the shaft tube 10 is closed to prevent volatilization of ink from the writing ink occlusion body 12, but when the rear end side is open, it may be sealed with a tail plug or the like. .

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

  Moreover, in 1st Embodiment, as shown to Fig.3 (a), the said ink guide part 16 for writing is the shape which bent the strip | belt-shaped body with a substantially circular cross section, and the surface of a writing side top part has a plane part. 16b, a corner portion 16a, and a curved surface portion 16c.

  The writing ink guiding portion 16 has a corner portion 16a and a curved surface portion 16c which are bent at approximately 90 ° at two points on the tip side. In addition, four corner portions 16b are formed on the corner portion 16a. The periphery of the flat part 16b and the joint part are chamfered to about R0.2 mm. The writing ink guiding portion 16 has a curved surface portion 16c that is bent in the radial direction. Moreover, the cross section of the front-end | tip (area | region between the corner | angular parts 16a to 16c) of the said ink guide part 16 for writing is atypical, and a cross section is circular from a center part to a rear part.

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

  By forming the four plane portions in this way, the writing ink guiding portion 16 has the flat 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. In this way, the pen core width is gradually reduced in the vicinity of the corner portion 16a along the ridgeline (contour) of the flat portion 16b.

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

The support member 18 according to the first embodiment will be described in detail with reference to the component diagrams of FIGS.
As shown in FIG. 1B, the support member 18 is fixed to the tip opening portion of the front shaft 20 of the shaft tube 10 by fixing the writing ink guide portion 16 to the periphery.
As shown in FIGS. 5A to 5H, the support member 18 includes a substantially bulging body portion 18a, a flange portion 18b having an annularly enlarged diameter on the front side of the body portion 18a, and a flange portion. It has a visible portion 18c that is transparent and can visually recognize the writing direction, and has a structure extending from 18b to a substantially plate-like direction. The support member 18 includes 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 circumferential surface in the longitudinal direction of the support member 18 composed of these portions.

  Further, a concave or convex fitting portion 18g for fitting to the inner periphery 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. The air circulation grooves 18h and 18j for air replacement having a concave cross section are formed on the outer peripheral surface extending from the first to the holding piece 18d. The structure is such that air is circulated with the outside air in the shaft tube 10 through the air circulation grooves 18h and 18j. Due to this structure, the writing ink occlusion body 12 can be replaced with air in the writing ink storage body 12 when the writing unit 14 is used.

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

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

  In addition, the writing portion 14 has the writing ink guide portion 16 at the front portion integrally wrapped around the support member 18 with the same material and covered with the front shaft 20 in the above-described manner, and the rear portion is within the front shaft 20. Then, the ink is inserted into the tip of the writing ink occlusion body 12 so that the writing ink can be supplied to the writing ink guiding portion 16 from there.

  As shown in FIG.1 (b), the front-end | tip of the writing part 14 (front-end | tip of the ink guide part 16 for writing) is an angle of 40-90 degrees with respect to the major axis direction LD of the axial cylinder 10 (main body axis | shaft). It is desirable to incline, and in this embodiment, the inclination is 75 °. These shapes are appropriately set according to the convenience of writing and the like.

  Moreover, the writing part 14 is a writing part with a thick drawn line width, preferably a drawn line width of 1 mm or more, and more preferably a drawn line width of 3 mm or more.

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

  Furthermore, if the visible portion 18c of the support member 18 is configured by a lens member having a lens effect (the same applies to the following), it is possible to enlarge the field of view to be seen.

  In the writing instrument having the writing unit 14 of the first embodiment, it is needless to say that the writing unit 14 can be suitably applied to a writing unit for bold writing and writing type writing tools.

  When the writing instrument having the writing part 14 of the first embodiment is written from the left to the right using the right hand with respect to the writing instrument having the writing part 14 having a large stroke width, the supporting member 18 is made of a transparent resin or glass. Since the visible portion 18c is provided, the right side of the writing tip is easy to see by the visible portion 18c located immediately above the longitudinal direction LD of the shaft tube 10 of the writing portion 14, and the position of the target portion can be easily specified.

  Thereby, when the target surface is painted with the above-mentioned writing instrument, or when used in a relatively narrow place, the remarkable usability can be improved.

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

  The writing instrument according to the second embodiment of the present invention has the structure shown in FIGS. 6 to 7, and the writing instrument of the first embodiment shown in FIGS. 1 to 3 is an ink guide for writing in the writing unit 14. The part (corresponding to “cursive”, also referred to as a pen core) is greatly different. Others are the same as the writing instrument which concerns on 1st Embodiment, and attaches | subjects the same code | symbol to the same part.

In the writing instrument according to the second embodiment, the curvature of the curved surface portion 16c is larger in the writing ink guiding portion 16 than in the first embodiment or the like.
The writing ink guiding portion 16 shown in FIG. 7 has a larger arc than the curved surface portion 16c of FIG. Moreover, the cross section of the front-end | tip (area | region between the corner | angular parts 16a to 16c) of the said ink guide part 16 for writing is atypical, and a cross section is circular from a center part to a rear part.
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 is possible. Other operations and effects are the same as those of the first embodiment.

In the said embodiment, although the shape structure of various ink guide parts 16 for writing was illustrated, it is an example and it cannot be overemphasized that other various shapes and structures can be taken. In the second embodiment, the support member has a pentagonal cross section, but may be a polygonal cross section other than a hexagonal cross section. Moreover, the structure of the supporting member from which a cross-sectional shape differs in the length direction may be sufficient.
In the writing instrument of the second embodiment, the writing ink guiding portion 16 supported so as to be surrounded by the support member 18 is linear and has a substantially circular cross section, but the cross section may be substantially polygonal. .

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

  (A)-(c) of FIG. 8 is drawing which shows the writing instrument which concerns on 3rd Embodiment, (a) is a front view, (b) is the rotated front view, (c) is (a). It is CC sectional view taken on the line.

  The writing instrument of this embodiment is of a pen type, and as shown in FIG. 8 (c), includes a shaft cylinder 10 serving as a writing instrument body, a writing ink storage body 12, a relay porous body 30, and a writing unit 14A. ing.

  The shaft tube 10 is formed of, for example, a synthetic resin, rubber, or elastomer, and stores a writing ink occlusion body 12 impregnated with writing ink for writing instruments, and a tip to which the writing portion 14A is fixed at the tip. A shaft 20 is provided. The shaft cylinder 10 and the tip shaft 20 are the same as the first embodiment in other configurations.

  The writing ink occlusion body 12 is impregnated with a fluid writing ink such as an aqueous 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 accommodated in the main body of the shaft tube 10. Although the rear end side of the shaft tube 10 is closed, it may be sealed with a tail plug formed of the same material as the shaft tube 10 or another synthetic resin material.

  The relay porous body 30 serves as a relay core that supplies the writing ink of the writing ink occlusion 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 ink occlusion body 12 for writing, 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, a resin particle sintered body, or a sliver core. And the writing ink impregnated in the writing ink occlusion body 12 can be supplied to the writing ink guiding portion 16A of the supporting member 18A via the relay porous body 30. 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 half-moon shape. In this embodiment, the cross-sectional shape is a circular shape. It has become. In addition, the relay porous body 30 of the present embodiment has a structure that is held by a support member 18A that is fitted in the front shaft 20, as shown in FIG.

  The writing unit 14A includes a writing porous body 22 serving as a writing body, and a support member 18A that holds the writing porous body 22 and includes a writing ink guiding unit 16A for supplying writing ink to the writing unit. Yes.

  The writing porous body 22 serving as the writing body of the present embodiment is fixed to the tip of the support member 18A. For example, natural fiber, animal hair fiber, polyacetal resin, polyethylene resin, acrylic resin, polyester Resin, polyamide resin, polyurethane resin, polyolefin resin, polyvinyl resin, polycarbonate resin, polyether resin, parallel fiber bundle made of a combination of two or more of polyphenylene resin, felt, etc. It consists of a fiber core obtained by processing fiber bundles or resin processing these fiber bundles, or a porous body (sintered core) obtained by sintering various plastic powders. In particular, by forming with a nylon resin having a porosity of 60% or more, it is possible to improve the drying of the drawn lines written on the paper surface and the like, and the usability can be improved.

  Examples of the shape of the writing porous body 22 serving as the writing portion include a chisel shape, a shell shape, a cylinder, an elliptical column, a cube, a rectangular parallelepiped, and the like, and its cross-sectional shape is a trapezoid, a parallelogram, etc. Shapes such as a shape, a rhombus, a kamaboko shape, a half moon shape, and the like can be cited. In this 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.

  The writing porous body 22 serving as a writing body is preferably 40 to 90 with respect to the long axis direction LD (FIG. 8B) of the shaft tube 10 (main body axis) so that the writing porous body 22 can be easily written. It is desirable to incline at an angle of °, and in this embodiment, the inclination is 75 °.

  The shape, inclination and the like of the writing porous body 22 serving as these writing bodies are appropriately set according to the usability of writing and the like. Moreover, the writing porous body 22 used as a writing body has a thick drawn line width, preferably a writing part having a drawn line width of 2 mm or more, more preferably a drawn line width of 3 mm or more.

  The support member 18A of the present embodiment is made of a material having visibility, such as PP, PE, PET, PEN, nylon (including amorphous nylon in addition to general nylon such as 6 nylon and 12 nylon), acrylic, and the like. It is preferably composed of a material such as polymethylpentene, polystyrene, ABS, etc., and a material having a visible light transmittance of 50% or more.

  If a material having a visible light transmittance of less than 50% is used, the target portion in the writing direction may not be effectively visually recognized, which is not preferable. In order to be able to exhibit a further good visual recognition function, a material that transmits 50% or more is preferable, and when the visible light transmittance is 80% or more, the material can be further visually recognized. The visible light transmittance can be determined by measuring the reflectance using a multi-light source colorimeter [manufactured by Suga Test Instruments Co., Ltd., multi-light source spectrocolorimeter (MSC-5N)].

  The support member 18A can be configured by using two or more types of materials from the viewpoint of further improving the durability and visibility of one type of each of the above materials, or by using two or more types of materials. In this case, it is preferable that at least one is made of a material having a visible light transmittance of 50% or more, and it can be molded by various molding methods such as injection molding.

  The support member 18A has at least one writing ink guiding portion 16A such as a communication hole for supplying writing ink to the writing portion. In this embodiment, the area ratio of the visual recognition portion is maximized. As shown in FIG. 8 (c), writing along the longitudinal direction LD is performed at the center of the writing portion 14A, as shown in FIG. 8C. One ink guiding portion 16A is provided so as to penetrate therethrough.

  The shape, size, etc. of the writing ink guiding portion 16A are such that the writing ink impregnated in the writing ink occlusion body 12 included in the writing instrument body is supplied directly to the writing ink guiding portion via the relay porous body 30. The shape, structure, size, number, etc. of the structure can be selected as appropriate. Preferably, from the point of maximizing the effect of the present invention, the length W (FIG. 8C) of the writing ink guiding portion 16A in the cross-sectional width direction is the long axis length X of the writing tip (FIG. 8). (C)) is less than 40%, more preferably 1 to 30%, and the cross-sectional area of the writing ink guiding portion 16A is the cross-sectional area on the narrow side of the holding body 18A of the writing portion 14A. Or less than the cross-sectional area of the relay porous body 30.

In particular, the length W in the width direction of the cross section of the writing ink guiding portion 16A is 3 mm or less, preferably from 0.1 to 2 in terms of ensuring a sufficient writing flow rate without impairing the visibility of the holding body. It is desirable that the diameter is 0.1 mm to 3.0 mm, preferably 0.2 mm to 2.5 mm, and more preferably 0.2 mm to 2.0 mm. . 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.

  Furthermore, it is preferable that the writing ink guiding portion 16A is tapered toward the writing porous body 22 side of the writing body, and 0 to 0 in the major axis direction LD of the shaft tube 10 (main body shaft). Although it may be two or more in the direction of 30 °, it is desirable that only one is provided. In addition, the shape of the writing ink guiding portion 16A is preferably a straight line with respect to the long axis direction LD, but it may be V-shaped, X-shaped, Y-shaped, spiral-shaped, inverted V-shaped, or inverted Y-shaped. The shape can be easily seen.

  As a method for forming the writing ink guiding portion 16A having the above structure, for example, after pouring resin into a mold provided with a rod-like body for forming a writing ink guiding portion, etc., and molding by various molding methods such as injection molding, A method of forming a writing ink guiding portion 16A on the support member 18A by performing die cutting, a method of forming the writing ink guiding portion 16A by drilling, laser processing, etc. after forming the supporting member 18A, and the supporting member 18A as two members And a method of forming the writing ink guiding portion 16A on the support member 18A by forming a groove for forming the writing ink guiding portion 16A on each of them and then integrating them by adhesion, welding, etc. It can be formed by the same method described in 1.

  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 writing ink described later is contained, does not function as a visual recognition portion, and is in a writing direction. It is desirable to make it invisible. In some cases, when the writing ink guiding portion 16A is visible when the writing ink is contained, the use of coloring components of the writing ink is restricted, and the writing ink color corresponding to the needs Is not preferable. In such a case, a pipe colored with 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 identified. Further, the writing ink guiding portion 16A is not a component as described above, but may be a space in the support member 18A.

  Further, the portion other than the writing ink guiding portion 16A of the supporting member 18A is a surface that forms a visual recognition portion, and it is desirable that the portion is a substantially parallel surface in order to effectively visually recognize the writing direction. In addition, it can also visually recognize by enlarging a visual recognition part as a lens surface.

  In the present invention, the adhesion between the writing porous body 22 serving as the writing body and the supporting member 18A having the writing ink guiding portion 16A firmly fixes the writing porous body 22 in a state where sealing performance is imparted. From the support member 18A, the resin for forming the holding body enters the unevenness of the pores of the writing porous body 22 where the writing porous body 22 and the supporting member 18A are in contact, thereby forming the holding body resin layer. It is desirable that the writing porous body 22 and the supporting member 18A are fixed.

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

  Preferably, on the end surface of the writing ink guiding portion 16A on the side of the writing porous body 22, a holding body resin layer (“the holding body resin layer on the boundary surface is bonded to the boundary surface) between the writing porous body 22 and the supporting member 18A” It is desirable that the bonding surface is formed with a length of 0.5 mm or more, more preferably 0.8 to 3 mm, in all directions of the end surface.

  The adhesive surface can be formed by any one of a flat surface, a curved surface, and a bent portion. The adhesive surface is 0.5 mm over the entire circumference of the end surface of the writing ink guiding portion 16A on the writing porous body 22 side. As described above, it is more preferable that the thickness is 0.8 to 3 mm.

  Further, it is desirable that the holding body resin layer on the adhesive surface is formed in the inside of the writing porous body 22 in an amount of 1 to 1000 μm, more preferably 10 to 800 μm, and the supporting member that contacts the writing porous body 22 It is desirable that the surface of the local summit of the contact portion of 18A is in a satin state due to a texture processing or the like.

  In the writing portion 14A, the rib body 18A1 (see FIG. 8A) is formed on the upper portion of the supporting member 18A in order to firmly fix the writing porous body 22 serving as a writing body and the supporting member 18A having the writing ink guiding portion 16A. )) Is provided on two or more of the side surfaces of the writing porous body 22, and in this embodiment, two are provided.

  Also, the adhesive surface between the writing porous body 22 and the supporting member 18A having the writing ink guiding portion 16A has two bottom surfaces inside the side surface of the rib body 18A1 and the bottom surface portion excluding the opening portion of the writing ink guiding portion 16A. It is a flat surface that serves as an adhesive surface. Furthermore, the surface of the local peak of the contact portion of the support member 18A that is in contact with the writing porous body 22 is in a satin-finished state due to graining 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 this embodiment configured as described above, the writing porous body 22 and the supporting member 18A are brought into contact with each other by bonding the writing porous body 22 serving as the writing section and the supporting member 18A having the writing ink guiding section 16A. The writing porous body 22 serving as a writing portion is formed by, for example, forming a holding body resin layer on the bottom surface portion of a resin forming the holding body from the support member 18A into the unevenness of the pores of the writing porous body 22 in the portion This makes it possible to reliably fix the supporting member 18A having the writing ink guiding portion 16A, and to obtain a writing instrument with excellent durability capable of securing a sufficient writing flow rate until the final writing.

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

  Specifically, the relay porous body 30 side adhesive surface is formed on any one of a flat surface, a curved surface, and a bent portion, and a hollow at the rear of the support member 18A is formed on the end surface of the writing ink guiding portion 16A on the relay porous body 30 side. A holding body resin layer (also referred to as “relay porous body side adhesive surface”) is formed on the boundary surface of the relay porous body 30 inserted between the openings over the entire circumference of the relay porous body 30 to have a thickness of 0.5 mm or more. The circumferential retainer 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 summit at the contact portion of the rear portion of the support member 18A that contacts the relay porous body 30 is subjected to a texture processing or the like. It is in a satin state.

  In this embodiment configured as described above, the relay porous body 30 and the support member 18A having the writing ink guiding portion 16A are bonded to each other at the portion where the relay porous body 30 and the support member 18A are in contact with each other. The support member 18A having the relay porous body 30 and the writing ink guiding portion 16A is formed by the resin forming the holding body from the support member 18A entering the irregularities of the pores of the body 30 to form the holding body resin layer. Can be reliably fixed, and a sufficient flow rate can be supplied to the writing ink guiding portion 16A, resulting in excellent durability. Further, the holding body 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 instrument of the present embodiment, the writing unit 14A, as described above, holds the writing porous body 22 serving as a writing body, and the writing ink for holding the writing porous body 22 and supplying the writing ink to the writing unit 14A. A support member 18A having at least one guiding portion 16A is provided, and a relay hole for supplying the writing ink contained in the shaft tube 10 of the writing instrument to the writing ink guiding portion 16A provided on the supporting member 18A. Since the supporting member 18A has a body 30 and is made of a material having visibility, the entire surface (the whole) other than the writing ink guiding portion 16A in the supporting member 18A can visually recognize the writing direction; With this structure, for the first time, the area ratio of the visual recognition part can be 40% or more of the writing part 14A protruding from the front end part of the main body of the shaft tube 10. Preferably, the visual recognition part of the side surface of the supporting member 18A of the writing part 14A is also 40% or more, and the writing ink guiding part 16A is formed at the center in the longitudinal direction of the supporting member 18A, and the width of the writing ink guiding part 16A. By suitably setting the length, diameter, cross-sectional area, etc. in the above-mentioned preferable range, the area ratio of the visual recognition part can be further increased to 50% or more, and a writing instrument that can be used until the end of coating is provided. Is done. 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. Furthermore, a writing instrument that can be used until the end of painting is provided.

  In addition, 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 can be very easily written.

  Furthermore, by using 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 serving as 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 instrument of the present invention is not limited to the above, and can be variously modified within a range not changing the gist of the present invention. The shape of the writing ink guiding portion 16A may be a letter shape such as a V shape, an X shape, a Y shape, a spiral shape, an inverted V shape, or an inverted X shape.

[Description of ink for writing]
Next, writing ink used for the writing instrument according to the embodiment will be described.
The ink composition for writing of the present invention comprises (a) an electron-donating color-forming organic compound, (b) an electron-accepting compound, and (c) a reversible heat comprising a reaction medium that determines the temperature at which the color reaction occurs. A reversible thermochromic microcapsule pigment encapsulating a color-changing composition; microcapsule particles having a specific gravity different from that of the reversible thermochromic microcapsule pigment; and a vehicle containing water and a polymer flocculant. The component encapsulated in the capsule particles is a reaction medium that determines the temperature at which the color reaction of (b) the electron-accepting compound and (c) both of which are encapsulated in the reversible thermochromic microcapsule pigment, and the surface tension is 30 A thermochromic ink having a 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.) and changes to another color (second color) when the temperature is raised to a high temperature discoloration temperature. The ink has the property of returning to the original color (first color) again when cooled to the recovery temperature. In general, the second color may be colorless, and the stroke drawn with the first color (for example, red) may be heated to be colorless. Therefore, the shaft tube 10 or the cap (not shown), which is a friction body, rubs against the paper surface on which the drawn line is written to generate frictional heat, thereby changing the drawn line to colorless. Of course, the second color may be a color other than colorless. By specifying the difference between the high temperature discoloration temperature and the low temperature recoloration temperature as 60 to 100 ° C. by setting the high temperature discoloration temperature in the range of 60 to 80 ° C. and the low temperature recoloration temperature in the range of −20 to 0 ° C. It is possible to effectively function to maintain the color exhibited in the living temperature range. In addition, since the shaft tube 10 and the cap are formed of a viscoelastic material, for example, an olefin-based elastomer, the shaft cylinder 10 and the cap can be easily functioned as a friction body, so that a writing tool that is easy to use can be provided.

  Specific examples of the components (a), (b) and (c) are given below. As the component (a) of the present invention, that is, the electron-donating color-forming organic compound, diphenylmethane phthalides, phenyl indolyl phthalides, indolyl phthalides, diphenyl methane azaphthalides, phenyl indolyl azaphthalide , Fluorans, stylinoquinolines, diazarhodamine lactones, etc., 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-Np-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-Np-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-diethylamino Fluorane, 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) pyrimidine-5,1 ′ (3 'H) isobenzofuran] -3'-one, 2- (diethylamino) -8- (diethylamino) -4-methyl-, spiro [5H- (1) benzopyrano (2,3-d) pyrimidine-5,1' (3′H) isobenzofuran] -3′-one, 2- (di-n-butylamino) -8- (di-n-butylamino) -4-methyl-, spiro [5H- (1) benzopyrano ( 2,3-d) pyrimidine-5,1 '(3'H) isobenzofuran] -3'-one, 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-Ni-amylamino) -4 -Methyl-, spiro [5H- (1) benzopyrano (2,3-d) pyrimidine-5,1 '(3'H) isobenzofuran] -3'-one, 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 3- (2-ethoxy-4-diethylaminophenyl) 3- (1-pentyl-2-methylindole-3-yl) -4,5,6,7 can be given tetrachloro phthalide like. Furthermore, there can be mentioned pyridine-based, quinazoline-based, bisquinazoline-based compounds and the like that are effective in developing fluorescent yellow to red color development.

As the electron-accepting compound of component (b), a group of compounds having active protons, a group of pseudo-acidic compounds (a group of compounds that are not acids but act as an acid in the composition and cause component (a) to develop color), electrons There is a group of compounds having pores. Examples of compounds having active protons include monophenols to polyphenols as compounds having phenolic hydroxyl groups, and alkyl groups, aryl groups, acyl groups, alkoxycarbonyl groups, carboxy groups and esters thereof as substituents. Alternatively, those having an amide group, a halogen group, etc., and bis-type and tris-type phenols, phenol-aldehyde condensation resins and the like can be mentioned. Moreover, the metal salt of the compound which has the said phenolic hydroxyl group may be sufficient.

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 N-octyl p-hydroxybenzoate, resorcin, dodecyl gallate, 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-methylbu 1,1-bis (4-hydroxyphenyl) -2-methylpropane, 1,1-bis (4-hydroxyphenyl) n-hexane, 1,1-bis (4-hydroxyphenyl) n-heptane, , 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) ethylpropionate, 2,2-bis (4-hydroxyphenyl)- 4-methylpentane, 2,2-bis (4-hydroxyphenyl) hexafluoropropane, 2,2-bis (4-hydroxyphenyl) n-heptane, 2,2-bis It is 4-hydroxyphenyl) n- nonane. The compound having a phenolic hydroxyl group can develop the most effective thermochromic property, but aromatic carboxylic acids and aliphatic carboxylic acids having 2 to 5 carbon atoms, carboxylic acid metal salts, acidic phosphate esters and their It may be a compound selected from metal salts, 1,2,3-triazole and derivatives thereof.

The component (c) of the reaction medium that causes the electron transfer reaction by the components (a) and (b) to occur reversibly in a specific temperature range will be described. Examples of the component (c) include alcohols, esters, ketones, ethers, and acid amides. The component (c) is preferably a large hysteresis characteristic regarding the color density-temperature curve (a curve plotting a change in color density due to a temperature change changes the temperature from the low temperature side to the high temperature side and the high temperature side to the low temperature side). A carboxylic acid ester compound that exhibits a ΔT value (melting point-cloud point) of 5 ° C. or higher and lower than 50 ° C., which can form a reversible thermochromic composition that exhibits color memory, and changes color when changing to the side) For example, a carboxylic acid ester having a substituted aromatic ring in the molecule, an ester of a carboxylic acid having an unsubstituted aromatic ring and an aliphatic alcohol having 10 or more carbon atoms, a carboxylic acid ester having a cyclohexyl group in the molecule, 6 carbon atoms Fatty acid and unsubstituted aromatic alcohol or phenol ester, fatty acid having 8 or more carbon atoms and branched aliphatic alcohol or ester, dicarboxylic acid And esters of aromatic alcohol or branched aliphatic alcohol, dibenzyl cinnamate, heptyl stearate, didecyl adipate, dilauryl adipate, dimyristyl adipate, dicetyl adipate, distearyl adipate, trilaurin, trimyristin, tristearin, Dimyristin, distearin and the like are used.

Also, fatty acid ester compounds 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 caprylate, N-tridecyl caprylate, n-pentadecyl caprylate, n-heptyl caprate, n-nonyl caprate, n-undecyl caprate, n-tridecyl caprate, n-pentadecyl caprate, n-pentyl laurate, lauric acid 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 ristinate, n-pentyl palmitate, n-heptyl palmitate, n-nonyl palmitate, n-undecyl palmitate, n-tridecyl palmitate, n-pentadecyl palmitate, n-nonyl stearate, stearic acid n-undecyl, n-tridecyl stearate, n-pentadecyl stearate, n-nonyl eicosanoate, n-undecyl eicosanoate, n-tridecyl eicosanoate, n-pentadecyl eicosanoate, n-nonyl behenate, n-behenate Examples include undecyl, n-tridecyl behenate, and n-pentadecyl behenate.

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. 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, laurone, stearone and the like. Further, arylalkyl ketones having 12 to 24 carbon atoms in total, such as n-octadecanophenone, n-heptadecanophenone, n-hexadecanophenone, n-pentadecanophenone, n-tetradecano Phenone, 4-n-dodecanacetophenone, n-tridecanophenone, 4-n-undecanoacetophenone, n-laurophenone, 4-n-decanoacetophenone, n-undecanophenone, 4-n-nonylacetophenone, n -Decanophenone, 4-n-octylacetophenone, n-nonanophenone, 4-n-heptylacetophenone, n-octanophenone, 4-n-hexylacetophenone, 4-n-cyclohexylacetophenone, 4-tert-butylpropiophenone, n-heptaphenone, 4-n-pentylacetophene Emissions, cyclohexyl phenyl ketone, benzyl -n- butyl ketone, 4-n-butyl acetophenone, n- hexanophenone, 4-isobutyl acetophenone, 1-acetonaphthone, 2-acetonaphthone, may be mentioned cyclopentyl phenyl ketone.

As 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, didodecyl ether. , Ditridecyl ether, ditetradecyl ether, dipentadecyl ether, dihexadecyl ether, dioctadecyl ether, decanediol dimethyl ether, undecane diol dimethyl ether, dodecane diol dimethyl ether, tridecane diol dimethyl ether, decane diol diethyl ether, undecane diol diethyl ether Etc. If the average value of the maximum outer diameter of the microcapsule pigment (including those having a circular cross-sectional shape) exceeds 5.0 μm, the outflow from the capillary gap tends to be reduced, and the average value of the maximum outer diameter is less than 0.5 μm. In this case, it becomes difficult to show high color density. 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 the value is larger than the above range, color density and sharpness during color development tend to be reduced.
The average particle size was measured using a particle size measuring device N4Plus (manufactured by COULTER). At the time of measurement, the sample was diluted with water until the recommended concentration of N4Plus was reached, and the measurement was performed at 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, and more preferably 10 to 30% by mass with respect to the total amount of the ink composition. If it is less than 5% by mass, the color density is insufficient, and if it exceeds 40% by mass, the ink outflow is reduced and writing performance is impaired.

As a 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, or the like is used. Note that the microcapsule pigment encapsulating the reversible thermochromic composition having a large hysteresis width has a specific gravity of more than 1, so that the water-soluble organic solvent to be applied is preferably more than 1.1.

By adding a water-soluble polymer flocculant into the ink, the flocculant causes a loose bridging action between the microcapsule pigment particles, and exhibits a loose aggregation state. Such an ink exhibiting a loose aggregation state can suppress the separation of the microcapsule pigment. A water-soluble polymer is used as the polymer flocculant, and examples thereof include polyvinyl pyrrolidone, polyethylene oxide, and water-soluble polysaccharides. Examples of the water-soluble polysaccharides include tragacanth gum, guar gum, pullulan, cyclodextrin, water-soluble cellulose derivatives and the like. Specific examples of water-soluble cellulose derivatives include methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose. Etc. 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 water-soluble cellulose derivatives are particularly effective. Function. Two or more kinds of the polymer flocculants can be used in combination.

The ink composition is prepared by adjusting the surface tension to a range of 30 to 40 mN / m. By adjusting the surface tension within the above range, it is difficult to cause blurring when written, and the ink can be left in a temperature range below 0 ° C. where the ink freezes, or left in a high temperature range such as 60 ° C. It is difficult to cause variations in handwriting density and writing width depending on the storage environment and use environment without impairing the flowability. When the surface tension is less than 30 mN / m, the outflow property of the ink tends to be unstable, and the handwriting density becomes non-uniform. Further, when the surface tension exceeds 40 mN / m, line breakage is likely to occur, and the ink outflow amount decreases due to the storage environment and use environment described above, and the handwriting density decreases, and the writing width tends to vary. . The ink composition is preferably adjusted to a pH of 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. If the pH exceeds 7, it tends to impair ink outflow when left in a low temperature range, that is, a temperature range where the ink freezes. If the pH is less than 2, the reversible thermochromic composition encapsulated in the capsule The color developability becomes strong, and it becomes easy to cause a problem that a color residue occurs at the time of decoloring.

There is a specific gravity difference between the reversible thermochromic microcapsule pigment and a vehicle comprising at least water and a polymer flocculant, and the specific gravity (during color development) of the reversible thermochromic microcapsule pigment is greater than the specific gravity of the vehicle. Then, the microcapsule pigment easily settles with time, and the precipitate becomes a hard cake, resulting in poor redispersibility. On the contrary, if 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 over time, and the suspended matter becomes a hard cake and poor in redispersibility. In order to solve the above problem, by adding microcapsule particles having a specific gravity different from that of the reversible thermochromic microcapsule pigment, when the specific gravity of the reversible thermochromic microcapsule pigment is larger than the specific gravity of the vehicle, Microcapsule particles having a low specific gravity are used. Further, when the specific gravity of the reversible thermochromic microcapsule pigment is smaller than the specific gravity of the vehicle, microcapsule particles having a larger specific gravity than the vehicle are used. In other words, the specific gravity of the vehicle exists between the specific gravity of the reversible thermochromic microcapsule pigment during color development and the specific gravity of the microcapsule particles. By adding such microcapsule particles, the mixed aggregates (reversible thermochromic microcapsule pigment and microcapsule particle aggregates) are adjusted in the vicinity of the specific gravity of the vehicle to reduce the specific gravity difference, As a result, it becomes difficult to separate in ink, and it can be easily redispersed even if separated.

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 inclusion. As the inclusion of the microcapsule particles, (b) an electron-accepting compound encapsulated in the reversible thermochromic microcapsule pigment and (c) a reaction medium for determining the temperature at which the color reaction of the both occurs 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 specific gravity may be impaired.

Further, the viscosity of the ink is 1.5 to 20 mPa · s (20 ° C.), preferably 1.5 to 10 mPa · s. If the ink viscosity exceeds 20 mPa · s, the ink outflow is reduced and the handwriting is fainted or interrupted. Sometimes.

Furthermore, trimethylglycine [also known as: glycine betaine, (CH ₃ ) ₂ N ⁺ (CH ₃ ) CH ₂ COO ⁻ ] is used for writing ink to act as a humectant and the like. Even if it is blended in the ink, the ink performance is not deteriorated, and the drying resistance of the nib, the drying of the drawn line, and the low temperature stability of the ink are exhibited.

The content of trimethylglycine is 0.5 to 50%, preferably 1 to 15%, 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 inhibiting the drying of the pen tip is not sufficient. On the other hand, if it exceeds 50%, the effect does not change so much, but rather the writing performance and storage stability due to increased viscosity. Will result in a decline.

Further, in writing ink, pentaerythritol [C (CH ₂ OH) ₄ ] is used to act as a moisturizing agent and the like, and synergistically with each of the above trimethylglycines rather than each single use. By acting, while suppressing the drying of the pen tip, it is excellent in the dryness of the drawn line and the low temperature stability of the ink, and exhibits excellent performance without blurring and back-through in the drawn line.

The content of pentaerythritol is 0.5 to 8%, preferably 2 to 5%, based on the total amount of the ink composition.
When the content of this content is less than 0.5%, the effect of inhibiting the drying of the nib is not sufficient, and a synergistic effect with trimethylglycine cannot be exhibited, whereas it exceeds 8%. And the effect of synergism with trimethylglycine does not change so much, leading to precipitation at low temperatures and a decrease in storage stability.

  The structure of the writing instrument used for the writing ink of the present invention is not particularly limited. For example, the shaft cylinder itself is used as an ink container to directly fill the shaft cylinder or to the occlusion body accommodated in the shaft cylinder. For example, a direct liquid type or batting type marking pen that occludes the ink for use.

  In order to produce the ink for writing, a conventionally known method can be employed, and it is obtained by mixing predetermined amounts 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, and may be prepared while defoaming, heating and cooling.

The ink for writing according to the present invention configured as described above is excellent in dryness of drawn lines and low-temperature stability of ink while suppressing drying of the nib, and expresses a function that does not cause bleeding or show-through in drawn lines. It can be estimated 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 nib, and these are used in combination in the writing ink composition rather than using each of these alone. By doing so, it is clear that they are acting synergistically. The reason for this is not necessarily clear, but it has excellent dryness of the drawn lines and low-temperature stability of the ink while suppressing the drying of the pen tip due to a synergistic effect, and demonstrates excellent performance without bleeding and back-through in the drawn lines. Guessed.
The ink for writing of the present invention has an extremely long-lasting effect that exerts the effects of the present invention, has a long onset period and duration, and trimethylglycine and pentaerythritol are water-soluble. The stability is also excellent.

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

DESCRIPTION OF SYMBOLS 10 Shaft cylinder 10a Rib 12 Writing ink occlusion body 14 Writing part (1st Embodiment, 2nd Embodiment)
14A Writing part (3rd Embodiment)
16 Writing ink guiding part (writing body according to the first embodiment and the second embodiment)
16A Writing ink guiding part (writing body 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 Axis 22 Written porous body

Claims (4)

In a writing instrument having a shaft cylinder containing writing ink, and a writing unit attached to one end of the shaft cylinder,
The writing unit includes a writing body capable of guiding the writing ink from the shaft tube and writing the writing ink, and a holding body for holding the writing body, and the holding body is visible. A writing instrument, wherein the writing body is formed with a plurality of plane portions. The writing instrument according to claim 1, wherein the plurality of flat portions are formed with flat portions, corner portions, and curved surface portions. The writing instrument according to claim 1 or 2, wherein the writing instrument is formed of a nylon resin having a porosity of 60% or more. 4. The writing instrument according to any one of claims 1 to 3, wherein the writing ink contains trimethylglycine and pentaerythritol.