JP4502607B2 - Fluid applicator - Google Patents

Description

  INDUSTRIAL APPLICABILITY The present invention is used for a fluid applicator filled with a fluid coating liquid such as oil-based ink having shear thinning viscosity and a correction liquid, particularly a correction tool including a ballpoint pen, a writing tool, an adhesive applicator, and a cosmetic tool. The present invention relates to a fluid applicator.

2. Description of the Related Art Conventionally, in a gel ink correction ballpoint pen that is a fluid applicator, a so-called refillable is desired for a fluid containing tube filled with a correction liquid (fluid) due to environmental problems. In that case, it is necessary to protect the tip of the ball during transportation and storage of the refill alone and to suppress volatilization of the solvent from the tip.
In order to prevent such volatilization, measures have been taken such as making parts constituting the fluid housing tube main body made of metal or resin and sealing the tip of the chip with a resin film.

  A number of techniques have been devised for the fluid housing tube formed by sealing the tip of the chip with this resin coating. For example, a resin coating with a synthetic resin emulsion (see, for example, Patent Document 1), heat melt thermoplasticity, and the like. Resin coating with resin (for example, see Patent Document 2), coating with polymer latex (for example, see Patent Document 3), resin film with hot melt resin (for example, see Patent Document 4), colored resin coating (for example, Patent Document 5) is known.

  However, the sealing with the resin coating described in the above Patent Documents 1 to 3 and 5 is a solvent or water that is not highly volatile, such as a water-based ink from the tip end portion (writing tip portion) or a water-based gel ink having shear thinning viscosity. In the case of fluids containing highly volatile solvents such as n-hexane, cyclohexane, and methylcyclohexane, there are resin resin coatings such as synthetic resin emulsions and polymer latex. However, it is still insufficient to suppress the evaporation, and when it takes a long time from manufacture to use, the fluid tends to solidify due to dry-up at the seal part, and the fluid cannot flow out of the chip. It has a problem to do.

In addition, the sealing with the resin coating described in Patent Document 4 is a comprehensive resin name for the tip of an applicator chip that is filled with a coating liquid having a high viscosity such as a correction liquid, a cosmetic liquid, an adhesive, or a paint. This is based on a hot melt resin such as an ethylene-vinyl acetate resin, a polyester resin, a polyamide resin, a polyolefin resin, and a rubber resin, and shows the proximity technique of the present invention. However, when this Patent Document 4 is examined closely, there is no description of Examples, and there is no description of specific solvent types and specific names of hot melt resins.
In particular, in the case of filling a fluid containing a solvent such as highly volatile n-hexane, cyclohexane or methylcyclohexane, even if it is a resin film made of ethylene-vinyl acetate resin or polyamide resin, its evaporation As with the above-mentioned water-based ink fluid applicator, it is easy to solidify the fluid for dry-up at the seal part when it takes a long time from manufacture to use. There is a problem that the fluid cannot flow out of the chip.
JP 58-96597 A (claims, etc.) JP 61-35294 A (Claims, Examples, etc.) JP-A-57-98396 (Claims, Examples, etc.) JP-A-7-222950 (Claims, Examples, etc.) Utility Model Registration No. 3076019 (Claims, Examples, etc.)

  The present invention has been made in view of the above-mentioned problems of the prior art and the present situation, and is intended to solve this problem. The refill type fluid coating liquid container is filled with a fluid coating liquid containing a highly volatile solvent. An object of the present invention is to provide a fluid applicator provided with a tube that reliably prevents volatilization from the tip of the tip and achieves simple refillable and capless.

  In light of the above-described conventional problems, the present inventors intend to solve this problem, and apply fluids such as oil-based inks having shear thinning and correction fluids containing at least an organic solvent, a colorant, and a resin. In a fluid applicator formed by filling a liquid and sealing the tip of the chip with a resin film with a hot melt adhesive, a resin film with specific physical properties is used as the resin film, and the pulling strength at the time of peeling is within a specific range. As a result, it was found that the above-described fluid applicator was obtained, and the present invention was completed.

（２） ボールペンチップ先端部の樹脂被膜によるシール部の厚みにおいて、ボール部への被膜シールの前記チップ先端開口部からの厚みをＤ１とし、前記チップ側面の厚みをＤ２とした場合に、Ｄ１＜Ｄ２となるように形成することを特徴としてなる上記（１）記載の流動体塗布具。
（３） 樹脂被膜によるシール形状が滴状、逆釣鐘状、円錐状の何れか一つであることを特徴としてなる上記（１）又は（２）に記載の流動体塗布具。
（４） ペン先となるボールペンチップ先端部を軸本体の後端側に設けたノック機構の押し出し操作及び押し出し解除操作に連動させて出没可能とするノック式のキャップレスとなることを特徴としてなる上記（１）〜（３）の何れか一つに記載の流動体塗布具。
（５） 流動体収容管は加圧機構を有する軸本体に収納自在となることを特徴としてなる上記（１）〜（４）の何れか一つに記載の流動体塗布具。 That is, the present invention resides in the following (1) to (5).
(1) A fluid coating solution having shear thinning viscosity, which includes a coating solution storage tube loaded in the shaft main body, and contains at least an organic solvent selected from the following group A and a colorant. Is a fluid applicator comprising a ballpoint pen tip having an outflow control mechanism at the tip and sealing the tip end with a resin coating with a hot melt adhesive, the resin coating comprising: It is a film made of a polymerized fatty acid-modified polyamide represented by the following general formula (I), and the pulling force under the conditions of 25 ° C. and 60 RH% using a push-pull tester is 1 to 10 N. A fluid applicator.
Group A: n-hexane, n-heptane, n-octane, isooctane, cyclohexane, methylcyclohexane, ethylcyclohexane, toluene, xylene

(2) In the thickness of the seal portion by the resin coating at the tip of the ballpoint pen tip, when the thickness from the tip tip opening of the coating seal to the ball portion is D1 and the thickness of the side surface of the tip is D2, D1 < The fluid applicator according to (1) above, wherein the fluid applicator is formed so as to be D2.
(3) The fluid applicator according to (1) or (2) above, wherein the seal shape of the resin film is any one of a drop shape, a reverse bell shape, and a cone shape.
(4) The tip of the ball-point pen tip serving as the pen tip is a knock-type capless that can be moved in and out in conjunction with the push-out operation and push-out release operation of the knock mechanism provided on the rear end side of the shaft body. The fluid applicator according to any one of (1) to (3) above.
(5) The fluid applicator according to any one of the above (1) to (4), wherein the fluid accommodating tube can be accommodated in a shaft body having a pressurizing mechanism.

  According to the present invention, there is provided a fluid applicator that reliably prevents volatilization of a highly volatile solvent from the tip of the chip and ensures protection of the tip of the chip, and also provides a simple refillable and cap. A fluid applicator that achieves less is provided.

Hereinafter, embodiments of the present invention will be described in detail.
The fluid applicator of the present invention includes a coating liquid storage tube that is loaded in the shaft body, and the coating liquid storage tube contains at least an organic solvent selected from the following group A and a coloring agent. A fluid applicator comprising a ballpoint pen tip having an outflow control mechanism at the tip thereof, and having the tip end portion sealed with a resin film of a hot melt adhesive. The resin film is a film made of a polymerized fatty acid-modified polyamide represented by the following general formula (I), and the film has a pulling force of 1 to 25 at 25 ° C. and 60 RH% using a push-pull tester. It is characterized by being 10N.
Group A: n-hexane, n-heptane, n-octane, isooctane, cyclohexane, methylcyclohexane, ethylcyclohexane, toluene, xylene

1 and 2 are drawings showing an example of an embodiment of a fluid applicator of the present invention, FIG. 1 is a partial longitudinal sectional view of the fluid applicator, and FIG. 2 is a fluid applicator of the present invention. It is an expanded partial sectional view which shows the principal part.
As shown in FIGS. 1 and 2, the fluid container A includes a coating liquid storage tube 10 loaded in the shaft body 18, and the coating liquid storage tube 10 is selected from at least the group A. A fluid coating liquid 30 having shear thinning viscosity containing an organic solvent and a colorant is filled, and a ballpoint pen tip 12 serving as a pen tip having an outflow control mechanism is provided at the tip, and the tip tip portion 12 is provided. Is sealed with a resin film H made of hot melt adhesive. Inside the tip end portion 12 serving as the pen tip, a metal (or ceramic) transfer ball 12a such as carbide is loaded.
As shown in FIG. 2, the tip 12 which is a ballpoint pen tip has a substantially cylindrical outer shape, and its tip is formed in a spire shape. An opening having a circular shape in plan view is formed at the tip, and the opening is opened with a size smaller than the outer diameter of the transfer ball 12a incorporated therein. Further, a ball holding portion 12b for holding the transfer ball 12a is formed inside the tip portion, and the ball holding portion 12b communicates the tip side with the opening and the rear end side communicates with the coating liquid passage. Has been.
Behind the transfer ball 12a disposed in the ball holding portion 12b, a ball push rod member 11b that is urged toward the tip from the back surface of the transfer ball 12a and an elastic material 11c including a coil spring are disposed.

In the present invention, the resin film H formed by sealing the tip portion of the chip 12 is mainly composed of polymerized fatty acid (dimer acid) and diamine (ethylenediamine, hexamethylenediamine, metaxylylenediamine, polyoxypropylenediamine, etc.). It becomes a solid at room temperature and is composed of a polymerized fatty acid-modified polyamide represented by the above general formula (I).
The polymerized fatty acid-modified polyamide represented by the above general formula (I) varies slightly depending on the type of diamine used (ethylenediamine, hexamethylenediamine, metaxylylenediamine, polyoxypropylenediamine), and is softened. The point (ring and ball method) is 100 ± 5 ± 210 ± 5 ° C., the melt viscosity (single cylinder rotational viscometer, 200 ° C.) is 200 to 20000 mPa · s, and the specific gravity (20/20 ° C.) is 0.97. ~ 1.01.
A film made of polymerized fatty acid-modified polyamide having these characteristics can be formed using a hot melt adhesive such as tomide 394, 535, 558, 1350, and 1360 (manufactured by Fuji Kasei Kogyo Co., Ltd.). .
As a method for forming (sealing) this polymerized fatty acid-modified polyamide at the tip of the chip 3, after the chip of the chip is immersed in a place where the polymerized fatty acid-modified polyamide is heated and melted at a temperature equal to or higher than the softening point, the chip is A method of forming a resin film on the tip end 3 of the chip by solidifying the heat-melt polymerized fatty acid-modified polyamide by pulling up the tip and cooling (natural drying or the like) can be used.

This resin film H needs to have a pulling force of 1 to 10 N under the conditions of 25 ° C. and 60 RH% using a push-pull tester of the film from the point of achieving the effects of the present invention. Preferably, it is 2-8N.
If the pulling force is less than 1 N, it becomes easy to remove by rubbing, contact, impact, etc., and the effect of the present invention cannot be exerted. If the pulling force exceeds 10 N, it takes a long time from manufacture to use. Even when a period of time is required, the sealing performance can be sufficiently achieved, but it is not preferable because the resin film H becomes difficult to peel off and the chip may be pulled out.
The tip 12 is fixed to the front shaft portion of the coating liquid storage tube 12. The pulling force for detaching the tip 12 from the coating solution storage tube 12 is the maximum pulling force of the resin coating H. Since it is twice or more than 10N, there is no possibility that the chip 12 comes off when the resin film H is peeled off.

Further, from the viewpoint of further reliably preventing the volatilization of the highly volatile solvent from the tip of the chip and further ensuring the protection of the tip of the chip, preferably, as shown in FIG. The thickness of the seal portion by H is desirably D1 <D2, where D1 is the thickness from the tip end opening of the coating seal to the ball portion and D2 is the thickness of the side surface of the chip .
In addition, the shape of the seal H by the resin film is not particularly limited as long as it is a resin film having the above physical properties that can surely prevent the volatilization of a highly volatile solvent from the tip of the chip and can protect the tip of the chip. For example, the reverse bell shape shown in FIG. 3A, the conical shape shown in FIG. 3B, the drop shape shown in FIG.
Furthermore, as shown in FIG. 2, the position of the seal H by the resin coating is simplified by removing the resin coating H by a finger or the like by providing a tip joint tip and a portion (E) that is not applied to the tip portion 12 as shown in FIG. May be.
The pulling force, the shape of the resin film H, the coating amount (thickness), and the like can be adjusted by the melting temperature, the immersion depth, and the pulling speed.

The resin film H made of this polymerized fatty acid-modified polyamide is filled with a fluid containing a highly volatile solvent of the above group A, that is, a solvent such as n-hexane, cyclohexane, methylcyclohexane or the like. However, excellent sealing performance is exhibited at the tip end of the chip, and even when it takes a long time from manufacture to use, there is no evaporation of the solvent or the like from the sealing portion. The resin film H made of this polymerized fatty acid-modified polyamide can exhibit an unprecedented excellent sealing performance as demonstrated in Examples and the like described later.
Further, the resin film H made of this polymerized fatty acid-modified polyamide is not affected by the fluid coating solution used, and has a moderate strength among many having a low adhesive strength to the stainless steel chip.

Examples of the fluid coating liquid 30 filled in the fluid coating liquid storage tube 10 include inorganic pigments such as carbon black and titanium dioxide, pigments such as organic pigments, resin pigments, and hollow resin pigments, oil-soluble dyes, and the like. Colorants such as the above dyes, at least one organic solvent selected from the above group A, thickeners soluble in the organic solvent, resins as binders, surfactants, fragrances, writing instruments, corrections A product obtained by appropriately dissolving or dispersing other optional components according to the use of a fluid such as a tool, an adhesive applicator, and a cosmetic is used.
About these compounding amounts, for example, 20 to 85% by weight of an organic solvent, 10 to 60% by weight of a colorant such as a pigment, 5 to 5% of resins and other components with respect to the total amount (100% by weight) of the fluid coating solution. It is desirable to make the composition about 30% by weight.
The fluid coating solution may be used as it is, but the fluid is finely divided silica, alumina, dibenzylsorbitol, organically treated bentonite, 12-hydroxystearic acid and derivatives thereof, hardened castor oil and derivatives thereof, N -Lauroyl-L-glutamic acid-.alpha.,. Gamma.-di-n-butyramide, paraffin wax, polyethylene wax and the like may be used as a gel ink (viscous material). By using this gel-like ink, it is easy to suppress sedimentation even when a colorant such as a heavy pigment (titanium oxide, etc.) is added to the fluid, and the ink or correction liquid can be applied to the coated object such as paper. When the fluid is applied, the “smudge” on the coated body can be suppressed by having the structural viscosity.

  The follower (follower) 32 filled in the fluid coating liquid storage tube 10 is a hardly volatile liquid material that is incompatible with the fluid coating liquid 32, and the rear end portion of the fluid coating liquid 30 described above. It is accommodated in a state of contact with the fluid and moves following the fluid as the fluid is consumed, thereby acting as a movable plug.

  In the present invention, the material of the coating liquid storage tube 10 that stores the fluid coating liquid is a problem of solvent volatilization from the side surface of the above-mentioned organic solvent storage tube using a volatile nonpolar solvent as the main solvent, and the storage tube itself. The material is not particularly limited as long as it is a material that has the visibility of the problem of erosion due to the solvent, and the strength required in the distribution stage, and that makes it easy to check the remaining amount of the contents at the time of use. Molded articles made of aliphatic polyamides, polymetaxylylene adipamide resins obtained from monomers having an aromatic ring or naphthene ring, molded articles of a copolymer of terephthalic acid, isophthalic acid and hexamethylenediamine, or these What is comprised from the molded object which blended these resin is mentioned.

  The fluid applicator configured in this way, like the conventional ballpoint pen type, screwed the joint (front shaft) member into the main body (shaft body) with or without a cap for fluid outflow. A fluid applicator that can be accommodated by a configuration such as the above, or a knock-less ballpoint pen type fluid applicator provided with a pressure pumping mechanism described in Japanese Patent Application Laid-Open No. 2000-335173 by the applicant of the present application, FIG. And used as a capless type pressurizing type knock type fluid applicator that can be stored in a main body having a pressurizing mechanism.

The configuration and the like of the pressure type knock type fluid applicator of the form shown in FIG. 1 will be briefly described. A refill unit 14 having a bow pen tip (an example of an applicator) 12 at the tip and a fluid containing tube 10 at the rear. Is loaded into the shaft main body 18 in a state of being repelled rearward by the first spring 16, and the ballpoint pen tip 12 of the refill unit 14 is provided at the rear end side of the shaft main body 18. 20 is a fluid applicator that can be projected and retracted from the front end opening 18a in conjunction with the push-out operation and the push-out operation, and the rear portion 10r in the fluid housing tube 10 of the refill unit 14 is opened, and the shaft main body 18 Is provided with a pressurizing mechanism 22 for increasing the internal pressure of the fluid accommodating tube 10 between the rear portion 10r and the knock mechanism 20, and the pressurizing mechanism 22 is formed of a seal portion 24 and a cylinder with an open front end. 26 and a second spring 28 that repels the seal portion 24 and the cylindrical portion 26 in a direction to separate them, and after the pushing operation of the knock mechanism 20 is finished, the tip of the ball-point pen tip 12 protruding from the shaft body 18 is provided. When the refill unit 14 is retreated by pressing, the sealing portion 24 is retreated in the pressurizing mechanism 22 and the cylinder portion 26 is relatively advanced to compress the internal air in the internal pressurizing chamber 40, and the compression. The check valve 46 is opened by the internal air thus formed, and the inside of the fluid containing tube 10 is pressurized through the seal portion 24.
Further, the pressurizing mechanism 22 releases the pressurized state in the fluid housing tube 10 in a state where the pen tip of the ballpoint pen tip 12 of the refill unit 14 is immersed in the shaft body 18 when the knock mechanism 20 is pushed out. Is.
The refill unit 14 includes a fluid containing liquid 10 filled with a fluid coating liquid 30 and a follower 32 that follows the fluid coating liquid 30 at its rear end, and a ballpoint pen press-fitted in front of the fluid containing pipe 10. A ball that is configured to include a tip 12 and is loosely fitted in the tip of the ball-point pen tip 12 is urged toward the tip by a spring via a push rod and is given back pressure. At the time of application, the tip end portion of the ballpoint pen tip 12 is closed. A follower 32 is filled in the rear portion of the fluid coating solution 30 in the refill 10 for the purpose of preventing volatilization of the solvent component of the fluid coating solution 30.

According to the fluid applicator A, even when the seal H is formed by the chip resin film, the outer diameter of the shaft 18 is set smaller than that of the opening 18a of the shaft 18 when not in use. It is structured to be housed inside. At the time of use, the tip of the tip 12 is taken out from the shaft main body 18 by knocking (see FIG. 1), and the resin coating H adhered to the tip of the tip 12 is detached with a finger or the like, and is used.
In this fluid applicator A, when the flow rate of the fluid application liquid is required, the tip of the tip 12 protruding from the shaft body 18 is pressed against the application surface, thereby further pressing the fluid containing tube 10 into the pressurizing mechanism. Thus, a larger applied pressure can be applied to the fluid housing tube 10. Thus, since pressurization can be performed only during use, it is possible to prevent leakage of correction fluid when not in use. Further, even when left knocked, the pressurized air gradually leaks, so there is no risk of correction fluid leaking. In addition, since it is possible to use a predetermined correction liquid or the like in which precipitation of titanium oxide pigment or the like is eliminated, the trouble of stirring the correction liquid or removing the cap is eliminated. Moreover, since it can pressurize simultaneously in conjunction with the operation by knocking, the user can use it without being aware of pressurization, and the operation feeling is excellent.
Furthermore, the fluid housing tube itself is excellent in transparency and visibility, and since the parts for pressurization are not particularly necessary, the refill cost can be kept low, and the running cost due to refill replacement can be reduced.
Furthermore, by releasing the knock, the pressurizing chamber of the cylinder part is ventilated with the atmosphere, so that it is not continuously pressurized even if the knocking operation is repeated. Further, there is no problem that the fluid coating liquid is excessively discharged on the paper surface.

  In the present invention configured as described above, the resin film that seals the tip of the ball-point pen tip is a film made of the polymerized fatty acid-modified polyamide represented by the general formula (I), and the pulling force is 1 to 10 N. Makes it possible to reliably prevent evaporation of the solvent from the tip of the chip and ensure protection of the tip of the chip even if it is filled with a fluid coating solution containing a highly volatile solvent. In addition, a fluid applicator that achieves caplessness can be obtained.

  The gist of the present invention is that, as described above, the tip of the ballpoint pen tip having the outflow control mechanism is sealed with a specific resin film, so that the structure of the coating liquid storage tube and the applicator for storing the storage tube are provided. The structure of the main body is not particularly limited, and it is needless to say that various modifications can be made to the structure of the coating liquid storage tube, the structure of the applicator main body, and the like without departing from the gist of the present invention.

  EXAMPLES Next, although an Example and a comparative example demonstrate this invention further more concretely, this invention is not limited at all by the following Example. “Parts” described below means parts by weight.

[Examples 1 to 5 and Comparative Examples 1 to 3]
The tip end of the chip was sealed with a resin coating or the like by each method using a resin coating material having the following composition in a coating liquid containing tube having the following configuration.
About the fluid applicator which sealed the obtained chip | tip tip part, it evaluated about the measurement of each drawing force, and evaluation of writability by the following method.
These results are shown in Table 1 below.

[Configuration of fluid applicator]
As shown in FIG. 1, a ballpoint pen type stainless steel nib (ball material: carbide, ball diameter: 1.0 mm) is provided at the tip as an outflow suppression mechanism, and the inner diameter is 6 mm, the outer diameter is 8 mm, the thickness is 1 mm, and the length is long. About 1.5 g of a correction liquid to be a fluid having the following composition and viscosity was injected into a storage tube made of nylon 12 having a thickness of 80 mm. Then, each fluid applicator was obtained by containing 0.5 g of the following composition and viscosity follower so as to be placed in contact with the end of the fluid.
Further, in the shape of the resin coating H and the thickness of the seal portion by the resin coating H at the tip of the ballpoint pen tip, the thickness (D1) of the coating seal from the tip of the tip to the ball portion, and the thickness D2 of the side surface of the tip are: As shown in Table 1 below.
(Formulation composition of fluid)
・ Methylcyclohexane 40 parts ・ Acrylic resin 10 parts ・ Titanium dioxide 49 parts ・ Powder silica 1 part (composition composition of follower)
-Diglycerin ethylene oxide 13 mol adduct 95 parts-Fine powder silica 5 parts Viscosity (25 ° C) of this correction liquid was measured with a viscometer (manufactured by Toki Sangyo Co., Ltd.), and it was 5000 mP · s at 1 rpm. The viscosity (25 ° C.) of the follower was 10,000 mP · s at 1 rpm.

Example 1
Tomide 394 (softening point 110 ° C.) was heated and melted at a temperature exceeding the softening point, and a resin film was applied to the tip of the chip.

(Example 2)
Tormide 535 (softening point 135 ° C.) was heated and melted at a temperature exceeding the softening point, and a resin film was attached to the tip of the chip.

(Example 3)
Tormide 558 (softening point 160 ° C.) was heated and melted at a temperature exceeding the softening point, and a resin film was applied to the tip of the chip.

Example 4
A tomide 1350 (softening point 152 ° C.) was heated and melted at a temperature exceeding the softening point, and a resin film was attached to the tip of the chip.

(Example 5)
Tormide 1360 (softening point 170 ° C.) was heated and melted at a temperature exceeding the softening point, and a resin film was applied to the tip of the chip.

(Comparative Example 1)
A fluid applicator without using a resin coating was used as it was.

(Comparative Example 2)
Polyamide Q9692 (manufactured by Henkel Japan) was heated and melted to attach a resin film to the tip of the chip.

(Comparative Example 3)
Polyolefin Q9301 (manufactured by Henkel Japan) was heated and melted, and a resin film was attached to the tip of the chip.

(Measurement method of pulling force)
Using a push-pull tester (push-pull scale (10N), manufactured by Imada Co., Ltd.), the pulling force under conditions of 25 ° C. and 60 RH% was measured.

(Writing evaluation method)
After leaving the fluid applicator obtained in Examples 1 to 5 and Comparative Examples 1 to 3 in a thermostatic bath at 50 ° C. for 2 weeks, each resin film was peeled off with a finger, and the writing state was evaluated according to the following evaluation criteria. (Number of samples: 10 each)
Evaluation criteria:
A: All can be written from the beginning.
◯: It can be immediately written that the writing is slightly dull.
Δ: Scratch may occur.
X: Something cannot be written.

  As is clear from the results of Table 1 above, Examples 1 to 5, which are the scope of the present invention, can easily remove the resin coating as compared with Comparative Examples 1 to 3, which are outside the scope of the present invention. It turned out that it is excellent also in property.

It is a fragmentary longitudinal cross-section which shows an example of embodiment of the fluid accommodation pipe | tube of this invention. It is an enlarged partial longitudinal cross-sectional view which shows the principal part of FIG. (A)-(c) is a partial longitudinal cross-sectional view which shows each shape of the resin film H. FIG.

Explanation of symbols

A Fluid applicator H Resin coating 10 Coating liquid storage tube 12 Ballpoint pen tip 30 Fluid coating liquid 32 Follower

Claims (5)

A coating solution storage tube loaded in the shaft body is provided, and the coating solution storage tube is filled with a fluid coating solution having shear thinning viscosity containing at least an organic solvent selected from the following group A and a colorant. And a fluid applicator comprising a ballpoint pen tip having an outflow control mechanism at the tip, and sealing the tip end with a resin coating with a hot melt adhesive, wherein the resin coating has the following general formula A flow characterized by being a coating of polymerized fatty acid-modified polyamide represented by (I) and having a pulling force of 1 to 10 N under conditions of 25 ° C. and 60 RH% using a push-pull tester of the coating. Body applicator.
Group A: n-hexane, n-heptane, n-octane, isooctane, cyclohexane, methylcyclohexane, ethylcyclohexane, toluene, xylene

In the thickness of the seal portion by the resin coating at the tip of the ball-point pen tip, D1 <D2 when the thickness from the tip tip opening of the coating seal to the ball portion is D1 and the thickness of the side surface of the tip is D2. The fluid applicator according to claim 1, wherein the fluid applicator is formed as described above.   The fluid applicator according to claim 1 or 2, wherein the seal shape of the resin film is any one of a drop shape, an inverted bell shape, and a conical shape.   2. A knock-type capless device, wherein a tip of a ball-point pen tip serving as a pen tip can be moved in and out in conjunction with a push-out operation and a push-out release operation of a knock mechanism provided on the rear end side of the shaft body. The fluid applicator according to any one of?   The fluid applicator according to any one of claims 1 to 4, wherein the fluid accommodating tube can be accommodated in a shaft body having a pressurizing mechanism.

Images