CN100548718C - Refills and refill units for correction pens - Google Patents

Abstract

A refill for a correction pen which is excellent in solvent resistance and moldability and enables its contents, i.e., a correction fluid having methylcyclohexane as a main solvent and its remaining amount to be easily visible during use or with the lapse of time, to be composed of the following molded article: a molded article of a polyamide resin obtained from a monomer having an aromatic ring or a cycloalkane ring; a molded article of a mixture of two or more polyamide resins; or a molded article having a multilayer structure of two or more layers, the innermost layer of which in contact with the correction fluid is composed of a polyamide resin. The application portion of the refill unit mounted on the ball-point pen type applicator having the pressurizing mechanism in conjunction with the pressing action is formed by press-fitting the rear end of the nib of the ball-point pen having the rotatable ball to the connecting portion at the front end of the ink reservoir, and the metal tube is pressed to cover the outer peripheral surface of the connecting portion at the front end of the ink reservoir on which the nib is press-fitted.

Description

Refills and refill units for correction pens

technical field

The present invention relates to a refill for a correction pen excellent in transparency and visibility (clear drainability), and also relates to a refill unit made of synthetic resin which is attached to a correction pen such as a ballpoint pen type On the applicator, the tip of the ballpoint pen can be protruded and retracted from the front of the barrel by means of a clicking mechanism and has a pressurizing mechanism linked to the clicking action.

Background technique

Recently, in consideration of environmental issues, there has been a need for a correction fluid container that stores correction fluid in a so-called refillable form. In order to develop the correction fluid container into a refillable form, it is necessary to select a solvent-resistant material because methylcyclohexane, the main solvent of the correction fluid, is highly volatile. It is also necessary to select a material that has a transparency that allows monitoring of the remaining amount of correction fluid.

Conventionally, a correction fluid container for a correction pen is known by extrusion molding of nylon resin (see Japanese Patent Application Laid-Open No. 2002-65351), blow molding, injection molding or by nylon 12 (see Japanese Patent Application Laid-Open No. 2002- 67585) to obtain enhanced solvent resistance compared to polyethylene and polypropylene and to suppress swelling due to the solvent used and solvent reduction due to penetration.

Polyamide resin molded articles made of aliphatic monomers such as nylon 12 and the like described in these documents have solvent resistance but do not have sufficiently high transparency. In addition, the correction fluid tends to adhere to the inner wall surface of the container and does not flow down as the correction fluid is consumed in use, so there are still problems that the remaining amount of the correction fluid cannot be properly monitored and it is difficult to Completely use up the filled correction fluid.

On the other hand, for conventional ballpoint pen-type writing implements and applicators such as correction pens, some have a free-fluid type structure in which ink or correction fluid is directly filled into the cartridge, and others have a structure in which ink or correction fluid is filled into the cartridge. The ink reservoir (refill) of the refill unit is accommodated in the cartridge. Either of these are configured so that the ballpoint pen tip is press fit directly to the front end of the cartridge or ink reservoir, or have a tip holder behind which the ballpoint pen tip is attached to its front The end is press fit to the front of an ink-filled cartridge or ink reservoir.

The front end of the cartridge made of synthetic resin on which the tip holder is press-fitted or the front end of the ink reservoir made of synthetic resin on which the tip is directly press-fitted is always in a state of being pressurized inwardly. This pressure, along with the additional pressure that may occur in the ballpoint pen tip during writing or application, causes the tip grip or press-fit force on the tip to decrease over time, resulting in problems such as tip gripping. The problem that the part or tip is easy to drop and the ink may leak from the press fit part.

In order to prevent ink leakage and drop of the tip holder of a free-fluid type ballpoint pen in which the ink is directly stored in a cartridge made of synthetic resin, a technique is known in which a rear end of the tip holder is press-fitted thereon. The front portion of the cartridge is covered with a metal pipe on its outer peripheral surface (see Japanese Patent Application Laid-Open No. 2002-113985).

However, the above-mentioned structure in itself, in which the front portion of the barrel to which the rear end of the tip gripping portion is connected, is covered with a metal pipe on its outer peripheral surface, cannot be expected to produce sufficient effects, and therefore, in the above-mentioned application The metal tube for the middle cover is adapted to be fixed between the flange of the tip grip and the front end of the barrel to achieve the desired effect.

In addition, due to the use of the tip holder, the number of parts increases, causing some problems in machining accuracy and assembly accuracy.

In addition, the refill unit has a tip that is press-fit directly onto an ink reservoir made of synthetic resin and is mounted to a ballpoint pen-type applicator whose tip can protrude from the front of the cartridge by means of a pressing mechanism. or retracted and the applicator has a pressurizing mechanism linked to the pressing action, in refill units additional pressure is applied from the rear end of the ink reservoir, with the ink reservoir press-fitted with the tip The internal pressure at the front, together with the pressure on the ballpoint pen tip during application, leads to the problem that there is a greater chance of the tip falling off and correction fluid leaking than usual.

In view of the above-mentioned problems in the prior art, it is an object of the present invention to solve them. The first object of the present invention is to provide a refill for a correction pen, which stores a correction fluid with highly volatile methylcyclohexane as the main solvent, wherein the refill for a correction pen has a solvent resistance and Transparency and visibility are so good that the stored correction fluid and its remaining amount can be easily monitored during use and over time. A second object of the present invention is to provide a refill unit that has a tip that is press-fit directly to an ink reservoir (refill) made of synthetic resin fitted to an applicator such as a ballpoint pen type correction pen. The nib can protrude and retract from the front of the barrel by means of a pressing mechanism, and the applicator has a pressurizing mechanism linked to the pressing action, wherein the refill unit is simple in structure and reduces the number of parts, It also prevents the tip from falling out of the ink reservoir and prevents leakage of ink, correction fluid, and the like.

Contents of the invention

In considering conventional refills for correction pens and refill units, the present inventors have found that the refills for correction pens of the above-mentioned first invention can be achieved by constituting a storage device having at least one methylcyclohexane A refill for a correction pen of a correction fluid with alkanes as the main solvent is obtained, which is composed of a molding of a resin having specific physical properties, and thus the refill for a correction pen of the present invention has been accomplished Taste. The present inventors have also completed the refill unit of the present invention, which has a tip that is directly press-fitted to an ink reservoir (refill) made of synthetic resin, and is mounted to an applicator such as a ballpoint pen type correction pen, which The tip of the applicator can be protruded and retracted from the front of the barrel by means of a pressing mechanism, and the applicator has an increasing mechanism linked to the pressing action, wherein the tip is connected by a press fit and covers the front end of the ink reservoir The end face of the part is fixed.

Specifically, the present invention is characterized by the following (1) to (18).

(1). A refill for a correction pen that stores a correction fluid having at least methylcyclohexane as a main solvent, characterized in that the refill for a correction pen is made of polyamide resin The molded article is composed of a polyamide resin obtained from a monomer having an aromatic ring or a naphthenic ring.

(2). A refill for a correction pen, which stores a correction fluid having at least methylcyclohexane as a main solvent, characterized in that the refill for a correction pen is composed of at least two poly A molded product made of a mixture of amide resins.

(3). The refill product for a correction pen according to the above item (2), wherein the polyamide resin is a polyamide resin having an aromatic ring and/or a naphthenic ring in the main chain.

(4). The repacking product for a correction pen as described in the above item (2) or (3), wherein the aliphatic-based polyamide resin has an aromatic ring and/or a naphthenic ring in the main chain A mixture of polyamide resins is used.

(5). The refilling article for a correction pen as described in any one of the above items (2) to (4), wherein the polyamide having an aromatic ring and/or a naphthenic ring in the main chain The resin is mixed in an amount of 5%-100% by weight.

(6). A refill product for a correction pen, which stores a correction fluid having at least methylcyclohexane as the main solvent, characterized in that, the refill product for a correction pen consists of two layers or A multilayer structure of more layers is constructed, and the innermost layer in contact with the correction fluid is composed of polyamide resin.

(7). The repacking product for a correction pen as described in the above item (6), wherein the polyamide resin layer of the innermost layer is made of a polyamide resin having an aromatic ring and/or a naphthenic ring in the main chain. Amide resin composition.

(8). The refill for a correction pen according to the above item (6) or (7), wherein the structure includes at least one layer of ethylene-vinyl alcohol copolymer.

(9). The refill product for a correction pen according to the above item (8), wherein the molar ratio of the vinyl group in the ethylene-vinyl alcohol copolymer is 10% to 60 mol%.

(10). The refilling product for a correction pen as described in any one of the above items (6) to (9), wherein the outermost layer has a water vapor permeability of 5g/m ² ·day/ 25 µm (40°C, 90% RH) or less polymer layer constitution.

(11). The refill product for a correction pen according to the above item (10), wherein the outermost layer is made of polypropylene or polycycloolefin.

(12). The refill product for a correction pen according to any one of the items (6) to (11) above, wherein the innermost polyamide resin layer has a thickness of 0.01 mm to 2 mm.

(13). The refill for a correction pen as described in any one of the above items (6) to (7), wherein the multi-layer refill for a correction pen is produced by co-extrusion, Manufactured by injection molding or blow molding.

(14). A refill unit comprising an applicator at a front end and an ink reservoir at a rear end, wherein the refill unit is installed in the cartridge so as to be pushed backward by a first spring;

The applicator of the refill unit is adapted to be able to protrude and retract with the protruding and protruding canceling action of the pressing mechanism provided at the rear end of the cartridge;

The ink reservoir of the refill unit is open at the rear end, and the barrel is provided with a pressurizing mechanism for increasing the internal pressure of the ink reservoir, the boosting mechanism being provided between the rear end of the ink reservoir and the pressing mechanism; and

The pressurizing mechanism includes a sealing part, a front-end open sleeve and a second spring for repellently pushing the sealing part and the sleeve in a direction of separating from each other; when the protruding action of the pressing mechanism is performed, the reloading unit When pushed back by squeezing the top of the applicator protruding from the barrel, the sleeve of the booster mechanism advances relative to the seal, thereby compressing the air within the ink reservoir, and wherein:

The refill unit is characterized in that: the applicator is formed by press-fitting the rear end of the ballpoint pen tip portion having a rotatable ball to the connection portion at the front end of the ink reservoir; and the metal tube is extruded to cover the The outer peripheral surface of the connecting part at the front end of the ink reservoir of the pointed part.

(15). A refill unit, characterized in that the ink reservoir of the refill unit is a refill for a correction pen as described in any one of the above items (1) to (13). kind of.

(16). The refill unit according to the above item (14) or (15), wherein the tip of the ballpoint pen has a metal ball at the front end and a metal clamping portion, and is configured such that the The ball is pressed from the rear side of the ball by pressing means comprising a spring element so as to bring the ball into close contact with the inner edge of the ball gripping portion at the front end of the tip.

(17). The refill unit as described in any one of the above items (14) to (16), characterized in that a metal tube with a narrowed end surface is extruded and fixed at the front end of the ink reservoir. on the outer peripheral surface of the connection portion so as to cover the end surface of the connection portion at the front end of the ink reservoir.

(18). The refill unit according to any one of the above items (14) to (17), wherein the metal tube is extruded and fixed to a press-fitted tip formed thereon. A protrusion or cutout on the outer peripheral surface of the connection portion at the front end of the ink reservoir.

Description of drawings

FIG. 1 shows an example of an embodiment of a refill for a correction pen in the present invention (first or second invention), and is a structure showing a tip portion of a ballpoint pen connected to a refill for a correction pen (refill). Vertical sectional view of loading unit);

Fig. 2 has shown another example of the embodiment that is used for the refilling product of correcting pen in the present invention (first or second invention), wherein (a) is a partial vertical sectional view, (b) is a sectional view along line A-A, ( c) is an enlarged vertical sectional view of part B;

FIG. 3 shows an example of an embodiment of a refill for a correction pen in the present invention (the third invention), showing a structure in which the tip of a ballpoint pen is connected to a multi-layer refill for a correction pen (refill). Vertical sectional view of loading unit);

Fig. 4 shows another example of the multi-layered repacking product for the correction pen in the present invention (third invention), wherein (a) is a partial vertical sectional view, (b) is a sectional view along the line A-A, and (c) is An enlarged vertical sectional view of Part B;

Figures 5 and 6 are vertical half-sectional views of the applicator in which the refill unit of the invention is accommodated in the cartridge, Figure 5 is a schematic view showing the operating state (during writing), Figure 6 is different from Figure 5 Show the schematic diagram under the non-operating state (non-writing period);

Fig. 7 is a vertical sectional view showing an example of the refill unit of the present invention;

Figure 8 is a sectional view along line C-C;

9 is a sectional view of a main part of a refill unit according to a first embodiment of the present invention;

10 is a sectional view of a main part of a refill unit according to a second embodiment of the present invention;

11 is a sectional view of a main part of a refill unit according to a third embodiment of the present invention; and

Fig. 12 is a sectional view of a main part of a refill unit according to a fourth embodiment of the present invention.

Detailed ways

Embodiments of the refill for the correction pen and the refill unit of the present invention will be described step by step in detail with reference to the accompanying drawings.

The refill for a correction pen of the present invention is a refill comprising any one of the following (1) to (3):

(1) A refill for a correction pen storing a correction fluid having at least methylcyclohexane as a main solvent, characterized in that the refill for a correction pen is composed of a polyamide resin molding, the polyamide The amide resin is obtained from a monomer having an aromatic ring or a naphthenic ring (this will be referred to as "the refill for a correction pen of the first invention").

(2) A refill for a correction pen stores a correction fluid having at least methylcyclohexane as a main solvent, characterized in that the refill for a correction pen consists of a mixture of at least two polyamide resins The molded article constitutes (this will be referred to as "the refill article for a correction pen of the second invention").

(3) A refill for a correction pen stores a correction fluid having at least methylcyclohexane as a main solvent, characterized in that the refill for a correction pen is composed of a poly The layer structure is constituted, and the innermost layer which is in contact with the correction fluid is constituted by polyamide resin (this will be referred to as "refill for correction pen of the third invention").

Fig. 1 shows an example of an embodiment of a refill for a correction pen of the first or second invention. The refill 10 for a correction pen stores therein a correction fluid 30 having at least methylcyclohexane as a main solvent, and a correction fluid follower 32 is provided in contact with the rear end of the correction fluid 30 . In addition, a tip portion 12 of a ballpoint pen as a smearing (writing) portion is connected to the front end of the refill 10 for a correction pen with a joint 11 located between the front end of the refill 10 and the tip 12 to form a refill unit. between.

Fig. 2 has shown another example of the embodiment that is used for the refill product of correcting pen among the present invention, and wherein (a) is partial vertical sectional view, (b) is the sectional view along line A-A, (c) is the enlarged vertical of B part cutaway view.

The refill 15 for a correction pen is a refill having an integrally molded joint (member), as shown in FIG. 2 . Although not shown, the refill 15 for a correction pen, as described above, stores therein a correction fluid having at least methylcyclohexane as a main solvent, and the correction fluid follower is arranged to follow the correction fluid. end contact.

The refill 10 or 15 for a correction pen is composed of a polyamide resin molded article or a molded article of a mixture of two or more polyamide resins composed of a monomer having an aromatic ring or a naphthenic ring get.

A polyamide resin obtained from a monomer having an aromatic ring as a raw material is a resin which has an aromatic ring in the main chain and includes, for example, polymetaxylylene adipamide resin, terephthalene Copolymers of formic acid or isophthalic acid and hexamethylenediamine, etc. Specifically, commercially available products such as NOVAMID X21 (manufactured by Mitsubishi Engineering Plastics Co., Ltd.), nylon MXD6 (manufactured by Mitsubishi Gas Chemical Co., Ltd.), SELAR PA (manufactured by DuPont), TROGAMID T5000 (manufactured by Daicel-Huels Ltd.).

A polyamide resin obtained from a monomer having a cycloalkane ring as a raw material is a resin having a naphthene ring in the main chain. Specifically, TROGAMID CX-7323 (manufactured by Daicel-Huels Co., Ltd.) can be used as a commercial resin having a naphthenic ring and high transparency.

Two or more polyamide resins having different physical properties may be mixed as the resin comprising a mixture of two or more polyamide resins in the second invention, considering that the single polyamide resin in the first invention above For better moldability and visibility of amide resins, one of the polyamide resins is preferably a polyamide resin having an aromatic ring or a naphthenic ring in the main chain. It is more preferable to use a mixture of an aliphatic polyamide resin and a polyamide resin having an aromatic ring or a naphthenic ring in the main chain.

The polyamide resin having an aromatic ring in the main chain in the second invention has a better, long-lasting smooth correction fluid compared to a single polyamide resin obtained from a monomer having an aromatic ring or a naphthenic ring in the first invention Drain ability (persistent clear drain ability against acorrection fluid), the correction fluid has at least methylcyclohexane as a main solvent, however, it is slightly inferior in terms of moldability and mechanical strength at low temperature. On the other hand, aliphatic polyamide resin is relatively cheap and excellent in moldability, but it appears a little milky white due to its smooth discharge ability and its own crystallization, so that it is somewhat inferior in visibility.

Taking this into consideration, in a particularly preferred mode of the second invention using a mixture of two or more polyamide resins, it is preferable to use a polyamide resin having an aromatic ring and/or a naphthenic ring in the main chain and Blend of aliphatic polyamide resins. When such a resin mixture is used, the polyamide resin having an aromatic ring and/or a naphthenic ring in the main chain is preferably in an amount of 5% to 100% by weight relative to the total amount of the resin mixture, more preferably 30% to 100%. 100% amount mixed.

If the amount of the polyamide resin having aromatic rings and/or naphthenic rings in the main chain is less than 5% by weight, it is impossible to expect improvement in long-lasting unimpeded discharge ability. The resin used in an amount of 100% by weight means a mixed resin of a polyamide resin having an aromatic ring in the main chain and a polyamide resin having a naphthene ring in the main chain.

All the polyamide resins mentioned above in the first invention can be used as usable polyamide resins having aromatic rings and/or naphthenic rings in the main chain.

In addition, inexpensive aliphatic polyamide resins such as nylon 6, nylon 66, nylon 11, nylon 12, etc. can also be used as the aliphatic polyamide resin.

The refill 10 or 15 for the correction pen of the first or second invention can be easily obtained by extrusion molding, injection molding, blow molding or other methods. Monomer-obtained polyamide resins, or mixtures of two or more polyamide resins, preferably polyamide resins having aromatic and/or naphthenic rings in the main chain, more preferably in the main chain A mixture of polyamide resins having aromatic and/or naphthenic rings and aliphatic polyamide resins.

Although the wall thickness of the refill 10 or 15 for a correction pen of the present invention may vary depending on the structure of the correction pen, the type of correction fluid, and other factors, it is preferably designated as 0.1-3 mm, more preferably 0.2-1.5 mm. mm.

A wall thickness of less than 0.1 mm results in poor mechanical strength, while a wall thickness of more than 3 mm is not preferred because it is too thick and results in a thick pen body, and at higher cost.

Fig. 3 shows an example of an embodiment of a refill for a correction pen according to the third invention. The refill 10 for a correction pen stores therein a correction fluid 30 having at least methylcyclohexane as a main solvent, and a correction fluid follower 32 is provided in contact with the rear end of the correction fluid 30 . In addition, a tip portion 12 of a ballpoint pen as a smearing (writing) portion is connected to the front end of the refill 10 for a correction pen with a joint 11 located between the front end of the refill 10 and the tip 12 to form a refill unit. between.

Fig. 4 has shown another example of the embodiment that is used for the refill product of correcting pen in the 3rd invention, wherein (a) is partial vertical sectional view, (b) is the sectional view along line A-A, (c) is the enlarged vertical of B part cutaway view.

The refill 15 for a correction pen is a refill having an integrally molded joint (member) as shown in FIG. 4 . Although not shown, the refill 15 for a correction pen, as described above, stores therein a correction fluid having at least methylcyclohexane as a main solvent, and the correction fluid follower is arranged to follow the correction fluid. end contact.

The refill 10 or 15 for a correction pen has a multilayer structure of two or more layers, and its innermost layer 10a or 15a in contact with the correction fluid 20 is composed of polyamide resin. The example shown in Figures 3 and 4 for refills 10 or 15 for correction pens has two layers (not including the adhesive layer), and the outer layer 10b or 15b can be composed of any number of layers as long as the innermost layer 10a or 15a It is made of polyamide resin.

The polyamide resin constituting the innermost layer 10a or 15a is not particularly limited as long as it belongs to the category of polyamide-based resins. However, using a polyamide resin having an aromatic ring and/or a naphthenic ring in the main chain is preferably using an aliphatic polyamide resin such as nylon 12 because of excellent solvent resistance and visibility. In addition, mixtures of these resins and the aforementioned aliphatic polyamide resins may be used in view of moldability.

Examples of the aliphatic polyamide resin usable in the third invention include nylon 6, nylon 66, nylon 11 and nylon 12, which are all inexpensive.

In addition, usable polyamide resins having aromatic rings and/or naphthenic rings in the main chain are particularly preferably suitable for correction pen refurbishment in view of their better solvent resistance and visibility than nylon 12 and the like. , but they are slightly inferior in terms of moldability and mechanical strength at low temperatures, so using them alone can cause some problems. In view of this, it is preferable to use a polyamide tree having an aromatic ring and/or a naphthenic ring in the main chain (which has the above-mentioned excellent properties) as the innermost layer formed as a thin layer to solve the above-mentioned problem of use, while another polymerized The material layer is formed as the outer layer to constitute a multi-layer structure, so that the enhanced effect of the present invention can be achieved.

Usable polyamide resins having an aromatic ring in the main chain include those polyamide resins having an aromatic ring in the main chain, such as polymetaxylylene adipamide resin, terephthalic acid, or isophthalic acid Copolymer of acid and hexamethylenediamine. Specifically, materials such as NOVAMID X21 (manufactured by Mitsubishi Engineering Plastics Co., Ltd.), nylon MXD6 (manufactured by Mitsubishi Gas Chemical Co., Ltd.), SELAR PA (manufactured by DuPont), TROGAMIDT5000 (manufactured by Daicel-Huels Co., Ltd.) can be used. commercial product.

A polyamide resin obtained from a monomer having a cycloalkane ring is a resin having a naphthene ring in the main chain. Specifically, TROGAMID CX-7323 (manufactured by Daicel-Huels Co., Ltd.) can be used as a commercial resin having a naphthenic ring and high transparency.

Two or more kinds of polyamide resins having different physical properties may be mixed as the resin comprising the mixture of two or more kinds of polyamide resins in the third invention, in view of improving long-lasting smooth discharge ability and moldability, It is preferable to use a mixture of a polyamide resin having an aromatic ring in the main chain and a polyamide resin having a naphthenic ring in the main chain or these polyamide resins and aliphatic polyamides having an aromatic ring and/or a naphthenic ring in the main chain A mixture of resins. When such a resin mixture is used, the polyamide resin having an aromatic ring and/or a naphthenic ring in the main chain is preferably in an amount of 5% to 100% by weight relative to the total amount of the resin mixture, more preferably 30% to 100%. 100% amount mixed.

The thickness of the innermost layer, that is, the polyamide resin layer 10a is specified to be 0.01-2 mm, preferably 0.05-1 mm, more preferably 0.1-0.8 mm.

A wall thickness of less than 0.1 mm results in poor solvent resistance, while a wall thickness of more than 2 mm is not preferred as it is too thick and results in a thick pen body and is more costly.

In the third invention, when a polyamide resin having an aromatic ring and/or a naphthenic ring in the main chain or a polyamide mixture including those resins is used as the innermost layer 10a, in consideration of the affinity with the polyamide of the inner layer, A layer including an aliphatic polyamide resin such as nylon 6, nylon 66, nylon 11, or nylon 12 may be used as the outer layer 10b or 15b on the outer side of the aforementioned polyamide resin innermost layer 10a or 15a, and these aliphatic polyamide resins are Less expensive polyamide based resin. Alternatively, polyester-based polymers such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), such as polypropylene (PP), polyethylene (PP) or poly Cycloolefinic polyolefins can be used to construct multilayer structures using polyolefin adhesives as bonding layers.

In the third invention, it is also preferable to include at least one layer of ethylene-vinyl alcohol copolymer (EVOH) which has excellent solvent resistance to solvents such as methylcyclohexane and has excellent resistance to oxygen and nitrogen gases. Good gas resistance. It is particularly preferred that at least one layer (out of a total of three layers) of the copolymer is formed as an intermediate layer between the innermost layer and the outermost layer.

From the viewpoint of improving solvent resistance and gas barrier capability, the ethylene-vinyl alcohol copolymer to be used is preferably a copolymer in which the copolymerization ratio of ethylene in the ethylene-vinyl alcohol copolymer falls within 10 -60mol% range.

Examples of EVOH whose copolymerization ratio of ethylene falls within the range of 20 to 60 mol% include: EP-F101 (copolymerization ratio of ethylene: 32 mol%, manufactured by Kuraray Co., Ltd.), EP-H101 (copolymerization ratio of ethylene: 38 mol%) %, manufactured by Kuraray Co., Ltd.), EP-E105 (copolymerization ratio of ethylene: 44 mol%, manufactured by Kuraray Co., Ltd.), EP-G156 (copolymerization ratio of ethylene: 47 mol%, manufactured by Kuraray Co., Ltd.), EP-G110 (copolymerization ratio of ethylene: 47mol%, manufactured by Kuraray Co., Ltd.), SOARNOL D2908 (copolymerization ratio of ethylene: 29mol%, manufactured by Gosei Nippon Chemical Industry Co., Ltd.), SOARNOL D3203 (copolymerization ratio of ethylene: 32mol%) %, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), SOARNOL D2903 (copolymerization ratio of ethylene: 29mol%, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), SOARNOL D3808 (copolymerization ratio of ethylene: 38mol%, manufactured by Nippon Synthetic Chemical Industry Co., Ltd. Co., Ltd.), SOARNOLET3803 (copolymerization ratio of ethylene: 38 mol%, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), SOARNOL A4412 (copolymerization ratio of ethylene: 44 mol%, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), and SOARNOL AT4403 (ethylene Copolymerization ratio: 44 mol%, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.).

When an EVOH layer is used, the thickness is preferably specified to be 0.01-1 mm, more preferably 0.1-0.5 mm.

In order for refills for correction pens to have excellent moisture absorption resistance, the outermost layer is desirably composed of a polymer layer having a thickness of 5 g/m ² ·day/25 μm (40° C., 90% RH) or less, preferably having a water vapor permeability of 3 g/m ² ·day/25 μm (40° C., 90% RH) or less.

Polypropylene, polyethylene, polycycloolefin, or a mixed resin of two or more of these resins can be used as the material for the outermost layer having the properties.

Polycyclic olefins include cycloolefin copolymers with combined properties of polyolefin resins and amorphous resins. The amorphous resins specifically include: APEL series (APL6509T, APL6013T, APL6011T, APL6015T, APL8008F, APL8009T, APL5014DP, produced by Mitsui Chemicals Co., Ltd. ) or ZEONOR1020R (manufactured by TOHCELLO Co., Ltd.) and cycloolefin resin, which is an amorphous resin and made from dicyclopentadiene in the C5 fraction as a main raw material, specifically ZEONEX and ZEONOR (manufactured by Zeon Co., Ltd. company manufacturing).

In connection with the above, when provided with the above-mentioned EVOH layer, the EVOH layer has slightly inferior moisture absorption resistance compared with other polymers, so that it is preferably a polymer layer having a water vapor permeability equal to or lower than the above-mentioned water vapor permeability Formed as EVOH outer layer.

The aforementioned EVOH layer and polymer layer having a water vapor permeability equal to or less than 5 g/m ² ·day/25 μm (40° C., 90% RH) can be used to constitute a multilayer structure by using appropriate adhesive layers, respectively, to produces good results.

As described above, the refill for a correction pen of the third invention is configured to have a multilayer structure of two or more layers, and can be formed by co-extrusion molding, co-blow molding, co-injection molding some of the following Resins for the innermost and outermost layers bonded together in a suitable manner are readily produced, wherein the innermost layer in contact with the correction fluid is composed of a polyamide resin, preferably having an aromatic ring in the main chain and/or Composed of naphthenic polyamide resins or a mixture of these resins and aliphatic polyamide resins, the outermost layer (including the middle layer) is composed of aliphatic polyamide resins, such as nylon 12, polyester-based polymers, polyolefin-based polymers material, EVOH, or a polymer whose water vapor permeability is lower than the aforementioned characteristic value, and an adhesive resin constituting the adhesive layer may also be used if necessary. In particular, coextrusion molding is preferable because it can form a multilayer structure at the time of molding.

Although the wall thickness of the refill 10 or 15 for a correction pen of the third invention may vary depending on the structure of the correction pen, the type of correction fluid, the thickness of the polyamide resin of the aforementioned innermost layer, and other factors, it is preferably Specify 0.5-3mm, more preferably 1-2mm.

In the first to third inventions, the correction fluid 30 stored in the refill 10 or 15 for a correction pen is not particularly limited as long as it has a commonly used correction fluid composition, for example, using a correction fluid prepared by Properly dissolving or dispersing a masking agent such as titanium dioxide, an organic solvent comprising at least methylcyclohexane as a main solvent (equal to or greater than 50% by weight of the solvent), a thickener soluble in an organic solvent, used as Binder resins, surfactants and other optional ingredients.

n-hexane, n-heptane, n-octane, isooctane, cyclohexane, ethylcyclohexane, toluene, xylene, etc. can be used as usable solvents other than methylcyclohexane.

For each component contained in the correction fluid, preferred components may include 20%-85% by weight of an organic solvent, 10%-60% by weight of a masking agent based on the total amount of the correction fluid (100% by weight) , 5%-30% by weight of resin and other components.

The above-mentioned correction fluid can be used in its original state, or it can also be prepared by adding materials such as finely powdered silica, aluminum oxide, dibenzyl sorbitol, organically processed bentonite, 12-hydroxystearic acid and its derivatives, hardened castor oil and its Derivatives, N-dodecanoyl-L-glutamic acid-alpha, gamma-two-n-butyramide, paraffin and polyethylene wax viscosity-providing agents are added to the above-mentioned amendments in an amount of 0.1%-10% by weight Liquid to use as a gel-type correction fluid. Prepare a gel-type correction fluid to prevent precipitation of titanium dioxide so that it can be handled without agitation. In addition, when the correction fluid is to be applied to an object to be applied such as paper, it can prevent stains from being generated on the object due to its structural viscosity.

In the refills for correction pens of the first to third inventions, the correction fluid follower 32 provided to be in contact with the rear end of the correction fluid 30 includes a The slightly volatile fluid that the rear end of the fluid contacts and acts as a movable plug as it moves as the correction fluid is consumed.

This slightly volatile fluid constituting the correction fluid follower 32 is not particularly limited as long as it has two basic properties: namely, prevents evaporation of the correction fluid and is not compatible with the correction fluid and is difficult to evaporate itself. For example, include a fluid (single or a mixture of two substances) selected from the group consisting of: glycerin, diglycerin, polyglycerol, polyethylene glycol, polypropylene glycol, alkylene glycol, alkyl ether, emulsifier, glycerol ring Alkane oxide adducts, diglycerol alkylene oxide adducts, and polyglycerol alkylene oxide adducts.

Furthermore, in order to enhance the performance of the correction fluid follower 32, a viscosity providing agent such as finely powdered silica, alumina, mixtures thereof, dibenzylsorbitol, etc. may be added to the aforementioned fluid to form a gel-type fluid.

The smearing (writing) portion is not particularly limited as long as it has a structure in which an appropriate amount of correction fluid can be discharged. For example, as shown in FIG. 1 or FIG. 3, it may be composed of a ballpoint pen tip 12 having a metal (stainless steel or ceramic) ball and a metal (stainless steel or ceramic) clamping portion at the front end. The ball is pushed by pressing means made of spring elements so that the ball remains in tight contact with the inner edge of the ball grip at the top of the tip. If the tip has a squeezing device, the ball sinks back during application to create a gap between the ball and the ball grip so that the correct amount of correction fluid can be expelled from the refill 10 or 15 through the gap to the outside for application . When the smearing work is finished (in a normal state), the ball is returned to the state of tight contact with the inner edge of the ball gripping portion at the top of the tip by the squeezing device, so that the correction fluid does not flow out.

As with conventional ballpoint pens, the refills for correction pens of the first to third inventions are incorporated into or used in correction pens in which the refills are screw-fitted with a joint (front barrel), etc. Detachably fixed to the main body (barrel); or used in a correction pen of the push-type ballpoint pen type with a pressurized pumping mechanism, as disclosed in Japanese Patent Application Laid-Open No. 2000-335173 filed by the present applicant; or used in In the applicator as shown in Figures 5 and 6 below.

According to the refill for a correction pen of the first invention constituted and used, the refill for a correction pen storing a correction liquid having at least methylcyclohexane as a main solvent is composed of a polyamide resin molding, This polyamide resin is obtained from monomers having an aromatic ring or a naphthenic ring, so that it can achieve excellent resistance to dissolution and make the contained correction fluid and its remaining amount easily visible during use and with the passage of time .

In the refill for a correction pen of the second invention, the refill for a correction pen storing a correction liquid having at least methylcyclohexane as a main solvent is composed of a mixture of at least two polyamide resins, preferably A mixture comprising, as one component, a polyamide resin having an aromatic ring and/or a naphthenic ring in the main chain, more preferably a mixture of a polyamide resin having an aromatic ring and/or a naphthenic ring in the main chain and an aliphatic polyamide resin The composition of the molded article can achieve good solvent resistance, allow better visibility (so that the correction fluid contained and its remaining amount can be easily seen during use and with the passage of time) and provide moldability.

Furthermore, in the refill for a correction pen of the third invention, the refill for a correction pen storing a correction liquid having at least methylcyclohexane as a main solvent is composed of a multi-layered product having two or more layers. layer structure, and the innermost layer in contact with the correction fluid is composed of polyamide resin, so that excellent solvent resistance can be achieved, and the correction fluid contained and its remaining amount can be preserved during use and with the passage of time. easy to see.

The refills for correction pens of the present invention (first to third inventions) are constructed as described above, and are characterized by their structure. Therefore, other constituent elements other than the refill, such as correction fluid, correction fluid follower, correction pen structure, etc., are not particularly limited, and therefore various modifications can be added without departing from the characteristics of the refill for a correction pen of the present invention. range. Preferred refill units for refills for correction pens using the first to third inventions will be described below in preferred forms.

Next, FIGS. 5 to 12 show embodiments of the refill unit of the present invention. 5 and 6 are vertical half-sectional views of the applicator, respectively showing states after and before pressing, wherein the refill unit according to the present invention is housed in the cartridge. Fig. 7 is a sectional view showing the refill unit. 8 to 12 show cross-sectional views of main parts of various embodiments of refills of the present invention.

The refill unit of the present invention is a refill unit made of synthetic resin, which is attached to an applicator such as a ballpoint pen type correction pen, the tip of which can be protruded from the front of the barrel by a pressing mechanism to shrink and retract. Go in, and it has a pressurization mechanism linked to the pressing action.

Schematically, the applicator for accommodating the refill unit of the present invention is constructed in the manner shown in FIGS. The refill unit 14 is installed inside the barrel 18, and it is pushed backward by the first spring 16; The protruding action and canceling action of the mechanism 20 protrude and retract from the front end opening 18a; the ink reservoir 10 of the aforementioned refill product 14 is opened at its rear end; the pressurizing mechanism 22 for increasing the internal pressure of the ink reservoir 10 is provided Between the ink reservoir rear end 10r and the pressing mechanism 20; the pressurizing mechanism 22 includes a sealing portion 24, a front opening sleeve 26 and a second spring 28, which is used to separate the sealing portion 24 and the sleeve 26 from each other. When the top of the ballpoint pen tip portion 12 of the applicator portion protruding from the barrel 18 is squeezed to retract the refill 14 after the protruding action of the pressing mechanism 20 is performed, the aforementioned sealing portion 24 returns and The sleeve 26 is relatively advanced in the pressurization mechanism 22 to compress the air in the pressurization chamber 40 so that the pressurized air opens the check valve 29 to pressurize the interior of the ink reservoir 10 through the seal 24 .

And, along with the protruding action of the pressing mechanism 20, the sealing portion 24 of the pressurizing mechanism 22 in the cartridge 18 comes into close contact with the ink reservoir rear end 10r of the refill 14, and then the bushing 26 moves forward further and compresses the pressurizing chamber 40, thereby pressurizing the air through the seal 24 to compress the interior of the ink reservoir 10 in a manner similar to that described above. Here, reference numeral 30 denotes a correction fluid (or ink, application fluid), and 32 denotes a follower following the correction fluid or the like. In addition, the pressurizing mechanism 22 is configured so that the ballpoint pen tip portion 12 of the refill 14 is retracted into the barrel 18 when the protruding action of the pressing mechanism 20 is canceled, and the booster in the refill 10 is in this state. The pressure state is released.

The ink reservoir 10 of the refill 14 is made of a molding of typical resin such as polypropylene, polyamide, etc. If the applicator is a correction pen, it is made of any one of the first to third inventions for the correction pen. 7 to 9, the front end portion 51 is narrowed to form a sleeve 52 whose diameter is smaller than the diameter of the rear end portion of the ink reservoir 10 to form a press fit for the tip portion 12. A plurality of ribs 54 of the receptacle 53 are formed in the middle of the sleeve 52 . A plurality of ribs 56 for receiving and fixing a metal pipe 55 fixed for covering by press-fitting to the front end of the sleeve 52 is additionally formed at an appropriate position outside the sleeve 52 .

The ball 57 at the top of the tip 12 is repulsively pushed by the spring 59 through the pressing rod 58 so that the ball 57 is in close contact with the caulk inner surface 66 at the front end to create an airtight state. One end face 60 of the spring 59 is directly received by a receiving portion 61 which is cut into the rib 54 halfway inside the sleeve 52 of the ink reservoir 10 .

The metal pipe 55 fixed by press-fitting to cover the outer peripheral surface 62 of the sleeve 52 may include typical metals such as aluminum, stainless steel, etc., and may have a simple annular shape or be formed into a shape whose one end surface 67 is narrower than The end surface 64 of the tip connection portion 63 at the front end of the sleeve 52 covering the ink reservoir 10 is covered, as shown in FIG. 10 .

Alternatively, as shown in FIG. 11 , an annular protrusion or cutout 65 may be formed on the outer peripheral surface 62 of the sleeve 52 of the ink reservoir 10 at a position where the metal tube 55 is press-fitted such that the metal cap is mainly pressed against the protrusion or cutout 65 . In addition, in the structure with the protruding portion or the cutout portion 65, one end face 67 is narrower as shown in FIG. 12 shown.

The refill unit of the present invention thus constituted can completely prevent the tip from falling off and from leaking ink, correction fluid, application fluid, etc. Squeeze forces on the tip of the ballpoint pen during the period and prevent forces that could cause the tip to slip out of the ink reservoir, such as pressurized pressure from the rear end of the ink reservoir, and prevent forces that squeeze the tip over time decrease.

In addition, since the refill unit of the present invention is constructed such that the tip is directly press-fitted to the ink reservoir without using any tip holder, the number of parts can be reduced, and there are also advantages in machining accuracy and assembly accuracy. .

Furthermore, since the tip is designed to be press-fit directly to the ink reservoir, this configuration also has the advantage of allowing ink or correction fluid stored in the ink reservoir to be visible before its level reaches the tip connection. monitoring effect.

And, since the metal tube is extruded and fixed to cover the outer peripheral surface of the tip connection part of the ink reservoir, it can also ensure a tight seal at the tip fitting surface of the ink reservoir, thereby keeping the ink or correction fluid stable .

In addition, the ink reservoir constituted by any one of the refills for correction pens of the above-mentioned first to third inventions can not only produce the above-mentioned effects but also provide a correction pen unit with excellent solvent resistance. Refillability, excellent visibility (so that the correction fluid contained and its remaining quantity can be easily seen during use and over time) and moldable refills.

example

The present invention is further described in detail below in conjunction with specific examples, however, the present invention is not limited to the following examples.

[Example 1-17 and Comparative Example 1-2]

Various refills for correction pens are produced by different methods using the resins specified below.

(example 1)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was extruded from nylon MXD6 (manufactured by Mitsubishi Gas Chemical Co., Ltd., the same hereinafter) to form a 70 mm long refill for a correction pen.

(Example 2)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm and a wall thickness of 1 mm was extruded from a TROGAMID T5000 (manufactured by Daicel-Huels Ltd.) to form a 70 mm long refill for the correction pen.

(Example 3)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was extruded from TROGAMID CX-7323 (manufactured by Daicel-Huels Co., Ltd.) to form a 70 mm long refill for a correction pen.

(Example 4)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was injection molded from NOVAMID X21 (manufactured by Mitsubishi Engineering Plastics Corporation) to form a 70 mm long refill for the correction pen.

(Example 5)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was injection molded from a mixture of Nylon 6 and NOVAMID X21 at a ratio of 30%:70% by weight to form a 70 mm long refill for a correction pen. decorations.

(Example 6)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was extruded from a mixture of nylon 12 and nylon MXD6 in a ratio of 30%:70% by weight to form a 70 mm long tube for a correction pen. Refill.

(Example 7)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was injection molded from a mixture of nylon 6, NOVAMID X21, and nylon MXD6 at a ratio of 20%:40%:40% by weight to form a 70 mm long tube. Refills for correction pens.

(Example 8)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was injection molded from a mixture of Nylon 6 and NOVAMID X21 at a ratio of 20%:80% by weight to form a 70 mm long refill for a correction pen. decorations.

(Example 9)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was injection molded from a mixture of nylon 12, NOVAMID X21, and nylon MXD6 at a ratio of 10%:40%:50% by weight to form a 70 mm long tube. Refills for correction pens.

(Example 10)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was co-injected to form a 70 mm long refill for a correction pen, and the tube was composed of two layers composed of two resins [outer layer: Nylon 6 / inner layer: NOVAMID X21 = 0.9mm/0.1mm]. The water vapor permeability of nylon 6 was 47 g/m ² ·day/25 µm (40°C, 90% RH) (the same is true for Examples 11 and 12).

(Example 11)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was co-extruded to form a 70 mm long refill for a correction pen, and the tube was composed of two layers composed of two resins [outer layer: nylon 6/Inner layer: Nylon MXD6＝0.9mm/0.1mm].

(Example 12)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was co-extruded to form a 70 mm long refill for a correction pen, and the tube was composed of two layers composed of two resins [outer layer: nylon 6/Inner layer: TROGAMID T5000＝0.9mm/0.1mm].

(Example 13)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was co-injection molded to form a 70 mm long refill for a correction pen, the tube consisting of four layers composed of four resins [outermost layer: poly Acrylic/adhesive layer: modified PP resin/nylon 6/innermost layer: NOVAMID X21＝0.2mm/0.01mm/0.69mm/0.1mm].

MODIC 502 manufactured by Mitsubishi Chemical Corporation (hereinafter also the same) can be used as the above-mentioned adhesive layer. The water vapor permeability of polypropylene was 1.6 g/m ² ·day/25 µm (40°C, 90% RH) (the same as in Examples 14 and 16).

(Example 14)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was co-extruded to form a 70 mm long refill for a correction pen, the tube consisting of four layers consisting of four resins [outermost layer: Polypropylene/adhesive layer: modified PP resin/intermediate layer: EVOH: EP-H101 (manufactured by Kuraray Co., Ltd., vinyl molar ratio is 38mol%)/innermost layer: NOVAMID X21=0.2mm/0.01mm /0.69mm/0.1mm].

(Example 15)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was co-injected to form a 70 mm long refill for a correction pen, and the tube was composed of three layers composed of three resins [Outermost layer: EVOH EP-E105 (manufactured by Kuraray Co., Ltd., vinyl molar ratio: 44%)/adhesive layer: modified PP resin/innermost layer: NOVAMID X21=0.89mm/0.01mm/0.1mm]. The water vapor permeability of EVOH is 38 g/m ² ·day/25 μm (40° C., 90% RH).

(Example 16)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was formed by coextrusion to form a 70 mm long refill for a correction pen, the tube consisting of five layers consisting of four resins [outermost layer: Polypropylene/adhesive layer: modified PP resin/EVOH; EP-E105 (manufactured by Kuraray Co., Ltd., vinyl molar ratio: 44%)/adhesive layer: modified PP resin/innermost layer: TROGAMID T1500=0.68mm/0.01mm/0.2mm/0.01mm/0.1mm].

(Example 17)

A tube with an outer diameter of 8 mm, an inner diameter of 6 mm, and a wall thickness of 1 mm was co-injection molded to form a 70 mm long refill for a correction pen, the tube consisting of five layers composed of four resins [outermost layer: poly Cycloolefin; ZEONOR1020R (manufactured by TOHCELL Co., Ltd.)/adhesive layer: modified PP resin/EVOH; EP-E105 (manufactured by Kuraray Co., Ltd., vinyl molar ratio: 44%)/adhesive: modified PP resin/innermost layer: NOVAMID X21＝0.68mm/0.01mm/0.2mm/0.01mm/0.1mm].

The water vapor permeability of the polycycloolefin is 0.5 g/m ² ·day/25 μm (40° C., 90% RH).

(comparison example 1)

A tube of 8 mm outer diameter, 6 mm inner diameter and 1 mm wall thickness was extruded from Nylon 12 to form a 70 mm long refill for the correction pen.

(comparative example 2)

A tube of 8 mm outer diameter, 6 mm inner diameter and 1 mm wall thickness was extruded from nylon 66 to form a 70 mm long refill for the correction pen.

Each refill for a correction pen obtained in the manner described above was filled with about 1.5 g of a correction fluid having a mixing composition and viscosity as listed below. Then, a 0.4 g follower was filled so as to be placed in contact with the rear end of the correction fluid to produce each correction pen consistent with Figure 1, the composition and viscosity of the follower being also listed below.

(Correction Fluid Mixing Ingredients)

Methylcyclohexane 40 parts

Acrylic resin 10 parts

Titanium dioxide 49 parts

Fine powdered silica 1 part

(Correction Fluid Follower Mixing Components)

Ethylene oxide and diglycerin 13mol adduct 95 parts

Fine powdered silica 5 parts

The viscosity (25° C.) of the correction fluid was measured by a viscometer (manufactured by Toki Sangyo Co., Ltd.) to be determined to be 5000 mP·s at 1 rpm. The viscosity (25°C) of the correction fluid following part is 10,000 mP·s at 1 rpm.

The solvent resistance and unimpeded discharge ability of the obtained correction fluids were evaluated by the following evaluation methods.

The results are shown in Table 1 below.

(Evaluation method of solvent resistance)

The correction pens obtained as above were left to stand in an environmental test room at 25° C., 65% RH for one month, and then the solvent resistance of each pen was visually evaluated based on the following evaluation criteria.

evaluation standard:

○ No changes were observed in refills

△Slight changes observed in refills

×Observed changes in refills

(Evaluation method of smooth discharge ability)

The correction pens obtained as above were left to stand in an environmental test room at 50° C., 65% RH for one month, and then the smooth discharge ability of each pen was visually evaluated based on the following evaluation criteria.

evaluation standard:

○Refills are transparent without any change, and the remaining amount can be easily monitored

△ Slight changes with slight turbidity were observed in refills, making it barely possible to monitor the remaining amount

×Change with turbidity observed in refills, making it impossible to monitor the remaining amount

Table 1

From the results shown in Table 1 above, it is apparent that Examples 1-17 falling within the scope of the present invention are superior to Comparative Examples 1-2 falling outside the scope of the present invention in solvent resistance and unimpeded discharge ability.

Industrial Applicability

The refill for a correction pen of the present invention is excellent in solvent resistance, visibility (so that the contained correction fluid and its remaining amount can be easily seen during use and with the passage of time) and moldability .

Furthermore, in the refill unit of the present invention, it is possible to completely prevent the drop of the tip and prevent the leakage of ink, correction fluid, application fluid, etc., and prevent the internal pressure of the front portion of the ink reservoir on which the tip is directly press-fitted. or squeezing force on the tip of a ballpoint pen during application, and prevents forces that could cause the tip to slip out of the ink reservoir, such as from the rear end of the ink reservoir, and prevents squeezing over time Reduction of force at the tip.

Claims (6)

1. product that refill that are used for correction pen, its storage comprises the opaquing fluid of hexahydrotoluene as solvent, it is characterized in that the described product that refill that are used for correction pen are made of the mechanograph of polyamide, this polyamide is obtained by the monomer with aromatic rings or naphthenic ring.

2. product that refill that are used for correction pen, its storage comprises the opaquing fluid of hexahydrotoluene as solvent, it is characterized in that, and the described product that refill that are used for correction pen are made of the mechanograph of the mixture of two kinds of polyamides at least.

3. the product that refill that are used for correction pen as claimed in claim 2 is characterized in that a kind of polyamide in described at least two kinds of polyamides is the polyamide that has aromatic rings and/or naphthenic ring in main chain.

4. the product that refill that are used for correction pen as claimed in claim 2 is characterized in that, the mixture of polyamide comprises the fatty group polyamide and have the polyamide of aromatic rings and/or naphthenic ring in main chain.

5. the product that refill that are used for correction pen as claimed in claim 3 is characterized in that the polyamide that has aromatic rings and/or naphthenic ring in main chain is mixed with the amount of percentage by weight 5%-100%.

6. one kind refills article unit, it is characterized in that, the ink housing tube that refills article unit is the product that refill that are used for correction pen as claimed in claim 1 or 2.

Images