JPH11277973A - Writing implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing implement which can obtain a good ink discharge almost at the normal temperature without lowering the ink followability of the ink backflow preventing body even at a low temperature. SOLUTION: In a writing instrument in which an ink storage tube having a pen tip attached to one end thereof is directly filled with ink and an ink backflow preventing body, the ink backflow preventing body contains a cleaving substance. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument in which an ink container having a pen tip attached to one end is directly filled with ink and an ink backflow preventer. Regarding excellent writing instruments.

[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. As the pen tip, a ball point pen tip, a fiber pen tip and the like are known. The ballpoint pen tip is obtained by attaching a ball made of ruby or tungsten carbide to a ballpoint pen tip made of a metal such as stainless steel or brass or a synthetic resin such as polyacetal. The fiber nib is a nib used for a felt-tip pen, a marker and the like, and is made by hardening a fiber such as nylon or polyester with a thermosetting adhesive.
The ink contains a coloring agent composed of a dye or a pigment and a solvent, and when a pigment is used as the coloring agent, 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 that titanium oxide is used as a coloring agent in an amount of 1 to 6% by weight.
Further, an ink using a colored pigment and resin particles is disclosed. 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-5-2701
No. 93 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 a writing instrument is created by directly filling the ink with a ball-point pen and then writing at a low temperature, the viscosity of the ink backflow preventer increases and the ink follow-up property decreases. Occurs.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a writing implement which can obtain a good ink discharge as well as writing at normal temperature without lowering the ink followability of the ink backflow preventer even at a low temperature. I do.

[0005]

SUMMARY OF THE INVENTION The present invention relates to 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 backflow preventer has a cleavage property. A writing instrument characterized by containing a substance.

The details will be described below. The pen tip used for the writing instrument of the present invention is conventionally used for a ballpoint 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 ballpoint pen tip used for the ballpoint pen is a ballpoint pen tip made of a ball made of ruby, tungsten carbide or the like attached to a ballpoint pen made of a metal such as stainless steel or brass or a synthetic resin such as polyacetal. The diameter of the ball, the dimensions of each part of the ballpoint pen tip, and the like are appropriately adjusted and used depending on the viscosity of the ink to be used and the particle size when a pigment is used as a coloring agent. The fiber nibs used for the felt-tip pens and markers are made of fibers such as nylon or polyester solidified with a thermosetting adhesive. The thickness of the fiber used and the porosity of the pen tip are appropriately adjusted and used depending on the viscosity of the ink used and the particle size when a pigment is used as a coloring agent. Further, if necessary, the fibers may be treated with a surfactant or the like before use.

[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. The shape may be a rectangular cross section other than a cylindrical shape. Usually, the inner diameter of the ink storage tube is about 2 to 6 mm, and its length is about 10 to 15 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 material, dyes and pigments can be used. When the dye is an aqueous ink, C.I. I. Acid. Black 2,
C. I. direct. Black 19 or the like can be used. In the case of oil-based ink, C.I. I. Solvent. Black 29,
C. I. Solvent. Black 34 or the like can be used. As the pigment, phthalocyanine blue, carbon black, titanium oxide or the like can be used.

As a solvent, water is used in the case of a water-based ink, and an aromatic hydrocarbon or an aliphatic hydrocarbon is used in the case of an oil-based ink. 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. In addition, acrylic resin, vinyl acetate resin,
A water-insoluble resin such as 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 inner diameter of the ink container used together, but is preferably 10,000 to 120,000 mPa · s (E-type viscometer, st rotor, 1 rpm, 25 ° C.). Non-volatile liquids or non-volatile liquids used as the base material include polybutene HV15 (specific gravity 0.870), LV
50 (specific gravity 0.856) (The above are Nippon Petrochemical Co., Ltd.
Empha K47 (specific gravity 1.19 to 1.22) and K50 (specific gravity 1.23 to 1.
26), KF410 made of silicone oil (specific gravity 1.
02) KF412 (specific gravity 0.89), Mobil SHF401 (specific gravity 0.853) composed of α-olefin, same as S
HF1001 (specific gravity 0.850) (above, manufactured by Mobile Chemical Products International, Inc., USA) and the like, 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.

By adding the cleavage substance, which is a feature of the present invention, to the ink backflow preventer, it is possible to ensure good ink dischargeability even when the viscosity of the ink backflow preventer increases during writing at a low temperature. Is what you use for Cleavage herein refers to a phenomenon in which, when a force is applied, the material breaks or peels in a specific direction or parallel to a specific surface, and the cleaving substance refers to a substance that functions as a solid lubricant. Specifically, molybdenum disulfide (specific gravity 4.8),
Boron nitride (specific gravity 2.3), talc (specific gravity 2.8),
Nε-lauroyl-L-lysine (specific gravity 1.2), graphite (specific gravity 2.2) and the like. It is preferable to use a cleaving substance having a specific gravity close to the specific gravity of the substrate in consideration of sedimentation over time. The amount of the cleaving substance used is preferably 1 to 20% by weight based on the total amount of the ink backflow preventer. Further, the amount of the ink backflow preventive used is 10 to 20 times the ink amount.
% By weight is preferred.

[0016]

The cleaving substance used in the ink backflow preventive of the writing instrument according to the present invention has a very small coefficient of friction and high lubricity. Therefore, even if the viscosity of the ink backflow prevention body increases at low temperatures, the friction resistance between the ink storage tube and the ink backflow prevention body is kept small, so that the ink followability does not decrease and good writing performance is considered to be secured. Can be

[0017]

EXAMPLES Ink Production Example 1 C.I. I. Direct Black 19 (direct dye) 3.0 parts by weight Ethylene glycol 10.0 parts by weight Glycerin 10.0 parts by weight Water 77.0 parts by weight The above components were stirred for 1 hour to obtain Ink 1.

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

Ink Production Example 3 Kronos KR 380 (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 0.0 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 Of the above components, each other than Kerzan AR After mixing the components and performing a dispersion treatment with a ball mill for 24 hours, Kerzan AR
And stirred for 1 hour to obtain Ink 3.

Ink backflow preventive body production example 1 Polybutene HV15 (manufactured by Nippon Petrochemical Co., Ltd.) 91 parts by weight Leopard KE (manufactured by Chiba Flour Milling Co., Ltd.) 3 parts by weight Aerosil R972 (manufactured by Nippon Aerosil Co., Ltd.) 4 parts by weight 5 parts by weight of molybdenum disulfide The above components were mixed and stirred with a hot stirrer at 150 ° C. for 30 minutes to obtain an ink backflow preventer.

Ink backflow preventive body production example 2 KF410 (silicone oil, manufactured by Shin-Etsu Chemical Co., Ltd.) 88 parts by weight Aerosil R972 (described above) 7 parts by weight Amihope LL (Nε-lauroyl-L-lysine, manufactured by Ajinomoto Co., Ltd.) 5 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.

Ink backflow preventive body production example 3 Empara K47 (chlorinated paraffin, manufactured by Ajinomoto Co., Inc.) 91 parts by weight Leopard KE (described above) 1 part by weight Aerosil R972 (described above) 3 parts by weight Boron nitride 5 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.

Ink backflow preventive body production example 4 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.

Example 1 A nib obtained by hardening a polyester fiber with a thermosetting adhesive was attached to a polypropylene ink storage tube, and the ink obtained in the above-described production example and the ink backflow preventer were placed in the ink storage tube. Filling was performed to obtain a writing instrument (marker).

Examples 2 to 4 and Comparative Example 1 A ball-point pen tip consisting of a 0.8 mm-diameter ball (material: carbide) and a stainless steel ball-point pen tip was attached to a polypropylene ink storage tube. Was filled with the ink and the ink backflow preventer obtained in the above-mentioned Production Example to obtain a writing implement (ballpoint pen).

The relationship between the inks and the ink backflow preventers in Examples 1 to 4 and Comparative Example 1 is as shown in Table 1.

[0027]

[Table 1]

The writing implements obtained in Examples 1 to 4 and Comparative Example 1 were subjected to a continuous writing test at 20 ° C. and 5 ° C.
A discharge amount of 0 to 100 m was measured. In addition, the writing implement was allowed to stand at 50 ° C. for one month with the pen tip upward, and the sedimentation state of the cleaving substance in the ink backflow preventing body at this time was observed. Table 3 shows the results.

[0029]

[Table 3]

Continuous Writing Conditions Using the marker obtained in Example 1, continuous writing was performed for 100 m using a linear writing type testing machine. Writing conditions Writing speed: 5 cm / sec Writing load: 100 g

Writing Conditions Using the ballpoint pens obtained in Examples 2 to 4 and Comparative Example 1,
100 m continuous writing was performed with a spiral writing type testing machine. Writing conditions Writing speed: 5 cm / sec Writing load: 100 g

Sedimentation of the cleaving powder ○: no sedimentation △: slight sedimentation ×: significant sedimentation

[0033]

As described in detail above, the writing implement according to the present invention is a good writing implement with a small decrease in the ink discharge amount even when writing at a low temperature. In particular, those using Nε-lauroyl-L-lysine as the cleaving substance are excellent in that the rate of decrease in the ink discharge amount is small and the settling of the cleaving substance in the ink backflow preventer is small.

Claims (2)

[Claims] 1. A writing instrument in which an ink storage tube having a pen tip attached to one end is directly filled with ink and an ink backflow preventer, wherein the ink backflow preventer contains a cleaving substance. Writing implement. 2. The method according to claim 1, wherein the cleaving substance is Nε-lauroyl-L-.
The writing instrument according to claim 1, wherein the writing instrument is lysine.