JPH0781290A - Ink receiving chamber for writing tool - Google Patents

Abstract

PURPOSE:To permit the securing of prominent ink remaining amount confirming property even after preservation for a long period of time by a method wherein an ink repelling layer, consisting of an epoxy resin and a (metha) acrylic acid thermosetting resin, is formed on the inner surface of an ink receiving chamber constituted of a thermoplastic resin. CONSTITUTION:The main body of writing instrument is formed of a fibrous pen point 2, retained at the tip end of a tube 1, and an ink receiving chamber 3, formed in the tube 1. The tube 1 is formed of a transparent or semi,-transparent polyolefin thermoplastic resin such as polyethylene, polypropylene, polyamide, polyethylene terephthalate and the like whereby the ink in the ink receiving chamber 3 can be seen from the outside of the writing tool. In this case, an ink repelling layer 10, consisting of a (metha) acrylic acid thermosetting resin, having a epoxy resin and a perfluoroalkyl group, is formed on the inner surface of the ink receiving chamber 3. According to this method, ink is repelled nicely for a long period of time whereby the remaining amount of ink can be seen surely and easily from the outside of the writing tool.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink storage chamber for writing instruments.

[0002]

2. Description of the Related Art Conventionally, there is known a writing instrument in which an ink storage chamber is formed of a transparent or translucent thermoplastic resin so that the consumption state of ink by writing (that is, the remaining amount of ink) can be confirmed from the outside. ing. With respect to such a writing instrument, many proposals have been made to prevent the ink from adhering to the inner surface of the ink containing chamber and making it difficult to check the remaining amount of the ink. For example, in Japanese Patent Publication No. 38-20913, an ink repellent treatment liquid such as a silicon varnish solution is applied to the inner wall of an ink containing tube and dried to form an ink repellent film on the inner wall of the ink containing tube. An improved ink containing tube for a ballpoint pen is disclosed. Also, Japanese Examined Japanese Patent Sho 61-40
No. 196 discloses that a transparent or translucent thermoplastic resin tube contains 0.08 to 0.23 mg / c of silicone oil.
An ink containing tube for a ball-point pen which is coated with m2 is disclosed.

[0003]

The ink-repelling film formed with the above-mentioned silicone varnish or the ink-accommodating tube coated with silicone oil has a low ink-repelling property on the inner wall of the ink-accommodating tube after being stored for a long period of time. However, there is a problem that it is difficult to check the remaining amount of ink. This problem appears particularly in the case of using a low-viscosity ink, and in the case of an ink using an alcohol-based solvent as a solvent, the alcohol-based solvent has a remarkable surface tension as compared with other solvents and is remarkable. . Further, the mechanical strength of the applied layer is weak, and the layer formed by the impact of stirring or the like is easily peeled off. Furthermore, by storing for a long period of time, static electricity is generated on minute particles in the ink (for example, pigments that are colorants or particles of insolubilized dye), and the static electricity is adsorbed on the inner wall of the ink storage tube and the remaining amount of ink remains. There was a problem that it was difficult to confirm.

[0004]

According to the present invention, a (meth) acrylic acid type thermosetting resin having an epoxy type resin and a perfluoroalkyl group on the inner surface of an ink containing chamber formed of a transparent or translucent thermoplastic resin is used. The gist is an ink storage chamber for a writing instrument, which is characterized in that an ink repulsion layer made of a resin is formed.

The details will be described below. FIG. 1 is an embodiment of the present invention. Reference numeral 1 is a barrel of the writing instrument main body. A fiber nib 2 is fixed to the tip of the barrel 1, and an ink storage chamber 3 is formed inside the barrel 1. Further, a valve seat member 5 having a seat portion 4 formed between the fiber nib 2 and the ink storage chamber 3, and a valve body having a valve portion 6 which abuts on the seat portion 4 and constitutes a valve mechanism. 7 and 7 are arranged. Reference numeral 8 denotes a valve rod arranged in the ink containing chamber 3, and the rear end of the valve rod 8 is fixed to a bellows portion 9 provided at the rear end of the barrel 1 and having elasticity. The valve rod 8 moves forward by pressing the rear end of the bellows portion 9, presses the valve body 7 to open the valve mechanism, and the ink in the ink containing chamber 3 is made to move to the fiber nib
It is possible to write on by discharging to.

The shaft cylinder 1 is made of polyethylene, polypropylene, polyamide, polyethylene terephthalate,
Since it is formed of a transparent or translucent polyolefin-based thermoplastic resin such as polybutylene terephthalate, the ink in the ink storage chamber 3 can be visually recognized from the outside of the writing instrument. Further, on the inner surface of the ink containing chamber 3, an ink repulsion layer 10 made of an epoxy resin and a (meth) acrylic acid thermosetting resin having a perfluoroalkyl group is formed. Although the ink containing chamber is formed inside the barrel in the above description, the ink containing chamber may be formed as an ink tank separate from the barrel.

The ink repellent layer 10 prevents ink from adhering and makes it easy to check the amount of ink remaining, but it also has excellent mechanical strength and maintains good ink repellent properties for a long period of time. Therefore, it is composed of an epoxy resin and a (meth) acrylic acid thermosetting resin having a perfluoroalkyl group. In its formation, an epoxy resin, a (meth) acrylate having a perfluoroalkyl group, a cross-linking agent such as N, N'methylenebisacrylamide, azobisisobutyronitrile or benzophenone, benzyl (dibenzyl), etc. A method in which a polymerization initiator such as a carbonyl compound is dissolved in an organic solvent such as trichloroethane is applied to the inner surface of the ink containing chamber 3 and radical polymerization is performed by light or heat, an epoxy resin and a perfluoroalkyl group are used. Have (meta)
A method in which a solution in which an acrylate and a copolymer of alkylene oxide such as ethylene oxide or propylene oxide are dissolved in an organic solvent is applied to the inner surface of the ink containing chamber 3 and is thermally polymerized can be adopted. The proportion of the epoxy resin in the ink repellent layer 10 is preferably 30 to 50% by weight.

Examples of the epoxy resin include bisphenol A type epoxy resin, novolac type epoxy resin, aliphatic epoxy resin and aliphatic cyclic epoxy resin.

Having a perfluoroalkyl group (meth)
Acrylic acid can be obtained by a conventional method such as an esterification reaction of (meth) acrylic acid with a perfluoroalkyl alcohol. Examples of the perfluoroalkyl group include polytetrafluorethylene and tetrafluoroethylene-
Perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-ethylene copolymer, polychlorotrifluoroethylene, Chlorotrifluoroethylene-
Examples thereof include ethylene copolymers, polyvinylidene fluoride, and polyvinyl fluoride.

[0010]

The ink storage chamber for a writing instrument of the present invention is formed of a transparent or translucent thermoplastic resin, and has an epoxy resin and a (meth) acrylic acid thermosetting resin having a perfluoroalkyl group on its inner surface. To form an ink repellent layer. In this ink repellent layer, since the ink is repelled well by the perfluoroalkyl group of the (meth) acrylic acid-based thermosetting resin, the remaining amount of the ink can be easily and visually confirmed from the outside of the writing instrument. In addition, when the ink repulsion layer is formed only with a (meth) acrylic acid-based thermosetting resin having a perfluoroalkyl group, fluorine is liable to be oriented on the surface and friction on the inside of the shaft causes static electricity on the negative side to occur. However, by using an epoxy resin together, it is difficult to generate negative static electricity in the ink repulsion layer, and it is effective in suppressing the adsorption of minute particles in the ink. . Moreover, since the epoxy resin is included, the hardness of the coating layer can be increased, and the coating layer is strong against impacts such as stirring, so that good ink resilience can be maintained even after long-term storage.

[0011]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. It should be noted that the ink storage chamber has an inner diameter of 12
A polypropylene cylindrical container having a size of 110 mm and a depth of 110 mm was used.

Example 1 Bisphenol A type epoxy resin 5 parts Polyacrylic acid polytetrafluoroethylene ester 5 parts N, N'methylene bisacrylamide (crosslinking agent) 3 parts Azobisisobutyronitrile (polymerization initiator) 2 parts 1, 85 parts of 1,1-trichloroethane The above components are mixed and stirred to form a uniform solution. This solution was applied to the inner surface of the ink containing chamber, and was irradiated with ultraviolet rays by a high-pressure germicidal lamp to radically polymerize to obtain an ink containing chamber having an ink repellent layer.

Example 2 Novolak type epoxy resin 5 parts Acrylic acid polychlorofluoroethylene ester 10 parts N, N'methylene bisacrylamide 8 parts Benzophenone 2 parts 1,1,1-Trichloroethane 75 parts An ink storage chamber was obtained in the same manner.

Example 3 Aliphatic epoxy resin 5 parts Acrylic acid tetrafluoroethylene-ethylene copolymer ester 5 parts N, N'methylenebisacrylamide 3 parts Azobisisobutyronitrile 2 parts 1,1,1-trichloroethane 85 parts The above components were used in the same manner as in Example 1 to obtain an ink containing chamber.

Example 4 Bisphenol A type epoxy resin 5 parts Acrylic tetrafluoroethylene-hexafluoropropylene copolymer ester 5 parts N, N'methylenebisacrylamide 3 parts Azobisisobutyronitrile 2 parts 1,1,1- Trichloroethane 85 parts The same ingredients were used as in Example 1 to obtain an ink containing chamber.

Examples 5 to 8 Ink containing chambers were obtained in the same manner as in Examples 1 to 4 except that acrylic acid in Examples 1 to 4 was replaced with methacrylic acid.

Example 9 Bisphenol A type epoxy resin 5 parts Polytetrafluoroethylene-ethylene oxide copolymer acrylate 10 parts 1,1,1-Trichloroethane 85 parts The above components are stirred and mixed to form a uniform solution. This solution was applied to the inner surface of the ink containing chamber and thermally polymerized under the conditions of 85 ° C. for 3 hours to obtain an ink containing chamber having an ink repellent layer.

Example 10 Novolak type epoxy resin 5 parts Acrylic acid (tetrafluoroethylene-hexafluoropropylene copolymer) -ethylene oxide copolymer 10 parts 1,1,1-trichloroethane 85 parts The same components as in Example 9 were used. After that, an ink storage chamber was obtained.

Example 11 Bisphenol A type epoxy resin 5 parts Polytetrafluoroethylene-propylene oxide copolymer acrylate 10 parts 1,1,1-Trichloroethane 85 parts Ink containing the above components in the same manner as in Example 9 Got a room.

Comparative Example 1 SR2406 (silicon varnish, manufactured by Toray Dow Corning Silicone Co., Ltd.) 80 parts Toluene 10 parts Ligroin 10 parts The above components are stirred and mixed to form a uniform solution. This solution was applied to the inner surface of the ink containing chamber and dried at 85 ° C. for 3 hours to obtain an ink containing chamber having an ink repellent layer formed by a silicon varnish coating.

Comparative Example 2 Polyacrylic acid (polytetrafluoroethylene) (thermoplastic resin) 10 parts 1,1,1-trichloroethane 90 parts The above components are stirred and mixed to form a uniform solution. This solution was applied to the inner surface of the ink storage chamber and thermally polymerized under the conditions of 85 ° C. for 3 hours to obtain an ink storage chamber in which an ink repellent layer of a thermoplastic resin was formed.

In the ink containing chambers obtained in Examples 1 to 11 and Comparative Examples 1 and 2, inks containing a pigment as a coloring material and ethyl alcohol and isopropyl alcohol as a solvent are used in the ink containing chambers. About half
After filling, an ink amount confirmation test was performed. The results are shown in Table 1.

[0023]

[Table 1]

Confirmation test of the remaining amount of ink: The ink containing chamber filled with the ink is tightly closed, and allowed to stand at room temperature for a predetermined time.
The ink containing chamber was shaken 10 times and allowed to stand still, and it was observed whether the ink remaining amount could be confirmed. Evaluation: ◯: There is no ink adhesion on the inner surface and the remaining ink amount can be easily confirmed. △: Ink adheres to the inner surface, but the remaining ink amount can be confirmed sufficiently. X: Ink adheres to the inner surface, making it difficult to check the remaining ink amount.

Coating strength test: JIS K5400 "pencil scratch test" was conducted.

[0026]

The ink storage chamber according to the present invention has the effect that the ink repellency does not deteriorate even after long-term storage, and the remaining ink amount can be easily and reliably confirmed. or,
The mechanical strength of the ink repellent layer is also high and good.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Shaft cylinder 2 Pen tip 3 Ink storage chamber 4 Seat portion 5 Valve seat member 6 Valve portion 7 Valve body 8 Valve rod 9 Bellows portion 10 Ink repulsion layer

Claims (1)

[Claims] 1. An ink repellent layer comprising an epoxy resin and a (meth) acrylic acid thermosetting resin having a perfluoroalkyl group, formed on the inner surface of an ink chamber formed of a transparent or translucent thermoplastic resin. An ink containing chamber for a writing instrument characterized by being formed.