JPH11245578A - Writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm an ink residue without adhering the ink to a coated inner wall of an ink containing tube at the time of writing by coating the inner wall of the tube with a substance of the same type as that of a base material of an ink back-flow preventing unit, and then directly filling the ink and the unit. SOLUTION: An ink and an ink back-flow preventing unit are directly filled in an ink containing tube having a nib mounted at one end to form the writing instrument, and an inner wall of the tube is coated with a substance of the same type as that of the unit. The tube for mounting the nib is made of a transparent or translucent polyethylene, a polypropylene or the like so as to confirm an ink residue. The unit is used to prevent leakage or dry of ink and made of a nonvolatile liquid and/or volatile retardant liquid as a base material and accompanied with a thicknener or a gelling agent as needed. As an embodiment of the nonvolatile liquid or volatile retardant liquid, fluidized paraffin, polybutene or the like is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing implement in which ink and an ink backflow preventer are directly filled in an ink storage tube having a pen tip attached to one end.

[0002]

2. Description of the Related Art A writing implement in which an ink and an ink backflow preventer are directly filled in an ink storage tube having a pen tip attached to one end is well known. The ink comprises a colorant composed of a dye or a pigment and a solvent. When a pigment is used as the colorant, a binder is used. As the solvent, there are a solvent using water and a water-soluble organic solvent, and a solvent using an organic solvent. In particular, in recent years, many articles using pigment as a coloring agent and water as a solvent have been proposed as having good handwriting smoothness and good handwriting robustness. For example,
JP-A-63-145380 discloses an ink using 1 to 6% by weight of titanium oxide as a colorant, and further using a colored pigment and resin particles. The ink backflow preventer is used to prevent leakage and drying of the ink from the ink storage tube, and uses a non-volatile liquid such as liquid paraffin or polybutene as a base material, and the base material is made of fine particle silica or the like. Gelled ones have been proposed. For example, JP-A-5-270193 discloses an ink backflow preventer using polybutene as a base material and fine-particle silica (Aerosil R972, manufactured by Nippon Aerosil Co., Ltd.) as a gelling agent.

[0003]

By the way, the ink storage tube is provided with an ink described in JP-A-63-145380 and an ink backflow preventer described in JP-A-5-270193. When writing is performed continuously with a writing implement that is directly filled with the ink, a problem arises in that the ink adheres to the ink container and the remaining amount of the ink cannot be confirmed.

SUMMARY OF THE INVENTION [0004] In view of the above problems, it is an object of the present invention to provide a writing implement which does not cause ink to adhere to the inner surface of an ink storage tube even when writing continuously, and which allows the remaining ink amount to be checked in any use condition. I do.

[0005]

According to the present invention, there is provided a writing instrument in which ink and an ink backflow preventer are directly filled in an ink storage tube having a pen tip attached to one end thereof, wherein the ink storage tube has an inner wall. In addition, the gist of the present invention is characterized by being coated with the same kind of substance as the base material of the ink backflow preventer.

The details will be described below. The pen tip of a writing instrument has been conventionally used for a ball-point pen, a felt-tip pen, and a marker, and can be used without any problem as long as the condition that the discharge amount of the ink to be used can be ensured is satisfied. The tip of a ballpoint pen is a ball made of ruby or tungsten carbide attached to a ballpoint pen tip made of a metal such as stainless steel or brass or a synthetic resin such as polyacetal.The viscosity of the ink used and the particle size of the pigment The dimensions are adjusted appropriately according to the requirements. In addition, the pens of marker pens and markers are made of fibers such as nylon and polyester hardened with a thermosetting adhesive, and the thickness and porosity of the fibers are adjusted according to the viscosity of the ink used and the particle size of the pigment. And use it. Moreover, you may use, after processing with a surfactant etc. as needed.

[0007] The ink storage tube to which the above-mentioned pen tip is attached is
A transparent or translucent material is often used so that the remaining amount of the ink can be confirmed, and for example, a material of polyethylene or polypropylene is well known. Usually, the inner diameter of the ink storage tube is about 2 to 4 mm, and its length is 10 to 15 mm.
cm.

[0008] The ink serves as a handwriting and includes at least a colorant and a solvent. When a pigment is used as the colorant, a binder is used.

As the coloring agent, dyes such as water blue and methyl violet and pigments such as phthalocyanine blue, carbon black and titanium oxide are used.

In the case of an aqueous ink, water is used as the solvent.
In the case of an oil-based ink, an aromatic hydrocarbon or an aliphatic hydrocarbon is used. In addition, as solvents for recent oil-based inks, alcohol solvents and cellosolve solvents are often used.

[0011] The binder is used for fixing the ink coating film to the paper surface. In the case of a water-based ink, specifically, styrene-acrylic acid copolymer alkali metal salt, amine salt, ammonium salt, α-methylstyrene-acrylic acid copolymer alkali metal salt, amine salt, A water-soluble resin such as an ammonium salt can be used. Further, a water-insoluble resin such as an acrylic resin, a vinyl acetate resin, and a styrene-butadiene copolymer can also be used. The water-insoluble resin is used in the form of an aqueous emulsion. In the case of an oil-based ink, specifically, a phenol resin, a ketone resin, a butyral resin, a polyamide resin, or the like can be used.

In addition to the above components, various additives conventionally used in water-based inks and oil-based inks for writing instruments can be used as needed. In the case of a water-based ink, for example, a water-soluble organic solvent such as ethylene glycol and glycerin and a sugar alcohol such as sorbitol and xylitol are used to prevent evaporation of the ink, and a thickening water-soluble material such as guar gum and xanthan gum is used to adjust the viscosity. A resin or a lubricant such as polyethylene glycol, polyoxyethylene glycol or polyoxypropylene glycol can be used to improve the writing feeling. In the case of oil-based inks, for example, plasticizers such as phthalate esters and sebacate esters to impart flexibility to the ink coating film, and solubilizers such as benzyl alcohol and ester solvents to use the dye in a high concentration Can also be used. Further, a preservative, a fungicide, a rust inhibitor and the like can be used irrespective of a water-based ink or an oil-based ink.

The ink backflow preventive is used to prevent ink leakage and drying, and uses a non-volatile liquid and / or a hardly volatile liquid as a base material. A thickener or a gelling agent is used in combination as necessary, for example, for adjustment. The viscosity of the ink backflow preventer varies depending on the ink used together and the type of pen tip, but is preferably 10,000 to 70,000 mPa · s (E-type viscometer, st rotor, 1 rpm, 25 ° C.).
Non-volatile liquid or non-volatile liquid used as a base material,
Examples thereof include liquid paraffin, polybutene, chlorinated paraffin, silicone oil, and α-olefin, and these can be used alone or in combination.

Examples of the above thickener and gelling agent include silica fine particles such as Aerosil (manufactured by Nippon Aerosil Co., Ltd.), hydrogenated castor oil-based materials such as Disparon 305 (manufactured by Kusumoto Kasei Co., Ltd.), and Soloid (3 Cellulose-based materials such as Akira Co., Ltd.), metal soaps, bentonite and the like.

In the present invention, it is necessary to apply the same kind of substance as that of the base material of the ink backflow preventive to the inner wall of the ink storage tube before directly filling the ink and the ink backflow preventive. This can prevent the ink from adhering to the ink storage tube during writing.
The substance of the same kind as the base material of the ink backflow preventive applied to the inner wall of the ink storage tube means a substance having the same structure as the base material. That is, for example, when polybutene is used as the base material, the substance applied to the inner wall of the ink storage tube is polybutene, but the polybutene used as the base material and the polybutene used as the coating substance have different average molecular weights and molecular weight distributions. May be. Of course, the same substance can be used.

[0016]

In the writing implement according to the present invention, the ink and the ink backflow preventive are directly filled after the same kind of substance as the base material of the ink backflow preventive is applied to the inner wall of the ink storage tube. Does not come into contact with the inner wall of the ink storage tube. Further, the adhesive force between the coating layer on the inner wall of the ink storage tube and the ink backflow preventer is larger than the adhesive force between the coating layer and the ink. This is because the substance of the coating layer and the base material of the ink backflow preventer are of the same kind. Therefore,
Even at the time of writing, since the ink does not adhere to the inner wall of the applied ink storage tube, the remaining ink amount can be confirmed.

[0017]

Example Production Example (Ink backflow preventive body 1) Polybutene HV15 (manufactured by Nippon Petrochemical Co., Ltd.) 96 parts by weight Leopard KE (manufactured by Chiba Flour Milling Co., Ltd.) 1 part by weight Aerosil R972 (manufactured by Nippon Aerosil Co., Ltd.) 3 parts by weight The above components were mixed and stirred with a hot stirrer at 150 ° C. for 30 minutes to obtain an ink backflow preventer 1.

Production Example (Ink Backflow Prevention Body 2) Lucant HC40 (ethylene-α-olefin oligomer manufactured by Mitsui Petrochemical Industries, Ltd.) 95 parts by weight Leopard KE (described above) 1 part by weight Aerosil R972 (described above) 4 parts by weight The components were mixed and stirred with a hot stirrer at 150 ° C. for 30 minutes to obtain an ink backflow preventer 2.

Production Example (Ink backflow preventive 3) Empara K47 (chlorinated paraffin, manufactured by Ajinomoto Co., Inc.) 92 parts by weight Leopard KE (described above) 5 parts by weight Aerosil R972 (described above) 3 parts by weight The above components were mixed. The mixture was stirred with a hot stirrer at 150 ° C. for 30 minutes to obtain an ink backflow preventer 3.

Production Example (Ink 1) I. Acid Black 2 (acid dye) 10.0 parts by weight Propylene glycol monoethyl ether 10.0 parts by weight Water 60.0 parts by weight 10.0% by weight of a 3% aqueous solution of Jaguar HP60 (Gar gum, manufactured by Sansei Co., Ltd.) Ingredients other than the 3% aqueous solution of Jaguar HP60 were mixed and stirred for 1 hour. Then, a 3% aqueous solution of Jaguar HP60 was added, and the mixture was further stirred for 1 hour to obtain Ink 1.

Production Example (Ink 2) Kronos KR380 (titanium oxide, manufactured by Titanium Industry Co., Ltd.) 30.0 parts by weight Joncryl J61J (ammonium salt of styrene-acrylate copolymer, manufactured by Johnson Polymer Co., Ltd.) 17.0 parts by weight Water 62.4 parts by weight Ethylene glycol 5.0 parts by weight Glycerin 5.0 parts by weight Kerzan AR (xanthan gum, manufactured by Sansei Co., Ltd.) 0.6 parts by weight Among the above components, other than Kerzan AR Are mixed and subjected to a dispersion treatment with a ball mill for 24 hours.
Was added and stirred for 1 hour to obtain Ink 2.

Manufacturing Example (Ink Storage Tube 1) A polypropylene cylinder having an inner diameter of 3 mm was replaced with polybutene (
After immersing in a 10% by weight methylcyclohexane solution of polybutene LV7 (manufactured by Nippon Petrochemical Co., Ltd.),
After drying for 4 hours, an ink storage tube 1 which was internally treated with polybutene was obtained.

Production Example (Ink Storage Tube 2) A polypropylene cylinder having an inner diameter of 3 mm was immersed in a 10% by weight methylcyclohexane solution of ethylene-α-olefin oligomer (Lucant HC10, manufactured by Mitsui Petrochemical Industries, Ltd.). The ink was dried at 80 ° C. for 24 hours to obtain an ink container 2 which was internally treated with an ethylene-α-olefin oligomer.

Production Example (Ink Storage Tube 3) A polypropylene cylinder having an inner diameter of 3 mm is immersed in a 10% by weight methylcyclohexane solution of chlorinated paraffin (Empara K43, manufactured by Ajinomoto Co., Inc.), and then is heated at 80 ° C. for 24 hours. The ink receiving tube 3 which was dried and internally treated with chlorinated paraffin was obtained.

Examples 1 to 3 and Comparative Examples 1 to 3 A ballpoint pen tip consisting of a ball (material: carbide) having a diameter of 0.8 mm and a stainless steel ballpoint pen tip is attached to an ink container to prevent ink and ink backflow. I filled my body and made a ballpoint pen. Examples 1-3 and Comparative Examples 1
Table 1 shows the relationship among the ink, the ink backflow preventer, and the ink storage tube in No. 3.

[0026]

[Table 1]

Notes in Table 1 (1) The numbers in the columns of ink, backflow preventive, and polypropylene ink storage tube are the serial numbers of the ink, backflow preventive, and polypropylene ink storage tube. (2) Comparative Example 1 is an example in which a non-volatile solvent and a non-volatile solvent were not treated in a polypropylene ink container.

As described above, the ballpoint pens obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were subjected to a continuous writing test, and the percentage of the area of the ink adhered to the polypropylene pipe after writing was visually measured. We checked whether the quantity could be confirmed. Table 2 shows the results.

[0029]

[Table 2]

Continuous Writing Conditions Using the ballpoint pens obtained in Examples 1 to 3 and Comparative Examples 1 to 3, writing was performed by a spiral writing type writing tester until the writing was completed. Writing conditions Writing speed: 5 cm / sec Writing load: 100 g

[0031]

As described in detail above, the writing implement according to the present invention is an extremely good writing implement that allows the amount of ink to adhere to the ink storage tube during continuous writing and allows the remaining amount of ink to be confirmed. .

Claims (1)

[Claims] 1. A writing instrument in which ink and an ink backflow prevention body are directly filled in an ink storage tube having a pen tip attached to one end, wherein the ink storage tube has an inner wall provided with the ink backflow prevention body. A writing implement characterized by being coated with the same kind of substance as the base material.