JP2004330456A - Oil-based writing instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an oil-based writing instrument which enables good writing by preventing the occurrence of a thin spot and an unwritable state, even if writing is done after the oil-based writing instrument is let alone in a cap-removed state for a long time. <P>SOLUTION: In this oil-based writing instrument, a fiber pen body of a type, wherein a fiber bundle is bound by a resin, is used for a pen tip; a lower alcohol is used as a prime solvent; oil-based ink, wherein a coloring agent, a resin and a pen-tip drying inhibitor are mixed, is incorporated; and a porosity of the fiber pen body is set to be in a specific range. When a fiber is an acrylic synthetic fiber, the porosity is set to be in a range of 58-62%. When the fiber is a polyester synthetic fiber, the porosity is set to be in a range of 50-68%. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００１９】
ここで表中の原料について注番号に従って説明する。
（１）黒色染料：ニグロシンベースＥＸ〔商品名、オリエント化学工業（株）製：Ｃ．Ｉ．ソルベントブラック７〕
（２）青色染料：バリファーストブルー１６０３〔商品名、オリエント化学工業（株）製：Ｃ．Ｉ．ダイレクトブルー８６とＣ．Ｉ．ベイシックブルー７の造塩染料〕
（３）樹脂：マルキードＮｏ．３３〔商品名、荒川化学工業（株）製：ロジン変性マレイン酸樹脂〕
（４）キャップオフ添加剤１：ＳＹグリスターＴＳ−３Ｓ〔商品名、坂本薬品工業（株）製：ポリグリセリン脂肪酸エステル〕
（５）キャップオフ添加剤２：ニッコールＳＳ−１０〔商品名、日光ケミカルズ（株）製：モノステアリン酸ソルビタン〕
（６）リン酸エステル系界面活性剤：フォスファノールＲＡ−６００〔商品名、東邦化学工業（株〕製：ポリオキシエチレンアルキルエーテルリン酸〕
【００２０】
繊維をポリエステルフィルムで被覆したインキ吸蔵体に試験用インキを所定量充填し、気孔率を段階的に変化させたポリエステル繊維からなるペン体とアクリル繊維からなるペン体を備えたマーキングペンに組み立て、キャップオフテストを行った。キャップオフテストはそれぞれのマーキングペンが正常に筆記できることを確認した後、キャップをはずした状態で温度２０℃、相対湿度６０％の環境下に水平状態で７日間放置した後、レポート用紙に１５ｃｍの直線を１０本筆記し、書き出しから正常に筆記できるまでの距離を測定した。前記キャップオフテストの結果を以下の表に示した。
【００２１】
【表２】

【００２２】
【表３】

【００２３】
キャップオフテストの評価基準は以下のとおり。
◎：書き出しから掠れなく正常に筆記できる。
○：書き出しからわずかな掠れが認められるが３０ｃｍ以内に回復した。
×書き出しから３０ｃｍ以上掠れる、或いは筆記できない。
【００２４】
【発明の効果】
本発明の油性筆記具は上述したように、キャップを外した状態で長期間放置しても筆跡が掠れることなく良好に筆記できる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a writing instrument containing an oil-based ink. In detail, it is a writing implement that has a fiber pen body that binds fiber bundles with resin and incorporates a quick-drying oil-based ink. The present invention relates to an oil-based writing instrument capable of effectively suppressing the occurrence of writing failure.
[0002]
[Prior art]
Oil-based inks, especially quick-drying oil-based inks whose main solvent is a low-boiling solvent, are used not only on ink-permeable surfaces such as cloth and paper, but also on ink-impermeable surfaces such as glass, metal, and plastic. Can be written, and the handwriting dries quickly. Further, in the case of the erasable ink for a writing board, a handwriting written on a writing board made of an enamel board, a coated metal plate or the like is quickly dried, and the dried handwriting can be erased by rubbing with an erasing tool. Having. However, the short drying time of the handwriting means that the drying speed of the ink on the surface of the pen body is also fast.If the cap is left unattended, the organic solvent in the ink evaporates in a short time and the dye In addition, since solids such as pigments and resins are deposited on the chip surface, the outflow of ink is hindered, and handwriting is blurred, or writing becomes impossible.
[0003]
In order to solve the above-mentioned problems, an attempt is made to prevent dry-up of the pen body by adding lecithin to the oil-based ink composition (for example, see Patent Document 1), or a pen tip is added by adding toluic acid. An attempt to suppress drying (for example, see Patent Document 2) is disclosed.
[0004]
[Patent Document 1]
Japanese Patent No. 2594457 [0005]
[Patent Document 2]
JP 2000-17216 A
However, although these conventional oil-based ink compositions have a certain improvement in cap-off property, the effect is about 5 to 8 hours, and if left in the cap-off state for one day or more, writing becomes completely impossible. Would.
[0007]
[Problems to be solved by the invention]
The present inventor has studied diligently on the improvement of the cap-off property of an oil-based writing instrument, and has found that a writing instrument having a fiber pen body filled with an oil-based ink composition containing a pen tip drying inhibitor and a fiber bundle bound with a resin. The inventors have found that by setting the porosity of the pen body to a specific range, cap-off performance can be drastically improved, and the present invention has been completed.
[0008]
[Means for Solving the Problems]
That is, the present invention relates to a writing implement having a fiber pen body in which a colorant, an organic solvent, a resin soluble in the organic solvent, and an oil-based ink comprising a pen tip drying inhibitor are incorporated, and a fiber bundle is bound with a resin. The gist is an oil-based writing instrument, wherein the fiber bundle is a bundle of acrylic synthetic fibers, and the porosity of the fiber pen body is 58 to 62%.
In addition, a coloring implement, an organic solvent, a resin soluble in the organic solvent, an oil-based ink comprising a pen tip drying inhibitor, and a writing implement including a fiber pen body in which a fiber bundle is bound with a resin, The bundle is a bundle of polyester synthetic fibers, wherein the fiber pen body has a porosity of 50 to 68%, an oil-based writing instrument, and the organic solvent is one or two kinds of aliphatic monohydric alcohols having 1 to 4 carbon atoms. The oil-based writing implement and the nib drying inhibitor which are the above mixed solvents are polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbite fatty acid ester, polyethylene glycol fatty acid ester, polyglycerin fatty acid ester, sorbitan fatty acid ester, fatty acid ester, paraffin wax. The gist of the present invention is an oil-based writing instrument characterized by being selected from the group consisting of:
[0009]
Next, the ink raw material used in the present invention will be described.
As the colorant, oil-soluble dyes and pigments conventionally used widely in oil-based inks for writing instruments can be used. Examples of the oil-soluble dye include a monoazo dye, a disazo dye, a metal complex salt type monoazo dye, an anthraquinone dye, a phthalocyanine dye, and a triallylmethane dye.
[0010]
In addition, conventionally known pigments can be used, and organic pigments such as azo pigments, phthalocyanine pigments, quinacridone pigments, anthraquinone pigments, dioxazine pigments, thioindigo pigments, and perinone perylene pigments can be used. And inorganic pigments such as carbon black, titanium oxide, and cadmium red.
Further, metallic luster pigments such as aluminum powder and brass powder, fluorescent pigments, pearl pigments and the like can also be used.
These colorants are added in an amount of 0.1 to 30% by weight, preferably 0.5 to 20% by weight, based on the total amount of the ink composition.
[0011]
As the organic solvent, a monohydric alcohol having 1 to 4 carbon atoms is used as a main solvent because of its excellent safety and dryness of handwriting, but glycol ether solvents such as ethylene glycol monomethyl ether and propylene glycol monomethyl ether, methyl cyclohexane, Alicyclic hydrocarbon solvents such as ethylcyclohexane, aromatic hydrocarbon solvents such as benzene, toluene, and xylene; ketone solvents such as methyl ethyl ketone and dimethyl ketone; methyl acetate, ethyl acetate, ethyl propionate, and methyl lactate. An appropriate amount of an ester solvent or the like can be added.
[0012]
Further, a resin soluble in the organic solvent can be added as a fixing agent for the handwriting on the paper surface and a dispersion stabilizer for the pigment. As the resin, those which are easily soluble in a monohydric alcohol as a main solvent are used.Specifically, a rosin resin, a hydrogenated rosin resin, a polyester resin, an acrylate resin, a cellulose resin, a ketone resin, Examples thereof include a hydrocarbon resin, a phenol resin, a terpene resin, an alkyd resin, polyvinyl butyral, and polyvinyl pyrrolidone. The resin is used in the range of 0.1 to 30% by weight, preferably 0.5 to 20% by weight based on the total amount of the ink.
[0013]
A pen tip drying inhibitor is added to the writing implement ink used in the present invention. The pen tip drying inhibitor is also referred to as a cap-off additive, but when left for a long time with the writing instrument cap removed, the dye, pigment or resin solidifies with the evaporation of the solvent on the surface of the pen body. This is intended to prevent a decrease in the fluidity of the ink due to precipitation, and to have an effect of delaying evaporation of the solvent by forming a thin and brittle film on the surface of the pen body.
Specific examples of the nib drying inhibitor include polyoxyethylene, sorbitan fatty acid ester, polyoxyethylene sorbite fatty acid ester, polyethylene glycol fatty acid ester, polyglycerin fatty acid ester, sorbitan fatty acid ester, fatty acid ester, paraffin wax and the like. The above-mentioned pen tip drying inhibitor is incorporated in an amount of 0.1 to 2.0% by weight based on the total amount of the ink.
[0014]
In addition to the above-described materials, additives such as fatty acids, amines, phosphate esters, rust preventives, defoamers, surfactants, and the like may be added as appropriate as dissolution aids for the components. Further, in the erasable marking pen ink for writing boards described above, erasability can be imparted by adding a non-volatile or non-volatile release agent. Examples of the release agent include higher fatty acid esters, higher aliphatic hydrocarbons, polyoxyethylene alkyl ethers, and polyoxyethylene alkyl phenol ethers.
[0015]
The present invention relates to a marking pen to which a fiber pen body in which a fiber bundle is bound with a resin is attached, and the cap-off performance is significantly improved by setting the porosity of the fiber pen body to a specific range. And Here, the porosity of the pen body will be described.
The porosity of the pen body is the ratio of the pore volume to the total volume (apparent volume) of the pen body, and can be measured by the following method.
The weight (m) of the pen body is measured.
The apparent volume (V) of the pen body is measured.
The pen body is impregnated with a liquid having a known density (ρ), and the weight (M) of the pen body impregnated with the liquid is measured.
The porosity is determined by the following equation.
[(M−m) ÷ ρ] ÷ V × 100 = porosity (%)
[0016]
In the fiber pen body used in the present invention, cap-off performance is remarkable by setting the porosity in the range of 58 to 62% for acrylic synthetic fibers and 50 to 68% for polyester synthetic fibers. To improve.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
The effects of the present invention will be described in the following examples.
As test inks of Examples and Comparative Examples, inks were prepared according to the formulations shown in the following table.
[0018]
[Table 1]

[0019]
Here, the raw materials in the table will be described according to the note numbers.
(1) Black dye: Nigrosine base EX [trade name, manufactured by Orient Chemical Industries, Ltd .: C.I. I. Solvent Black 7]
(2) Blue dye: Balifast Blue 1603 [trade name, manufactured by Orient Chemical Industries, Ltd .: C.I. I. Direct Blue 86 and C.I. I. Basic Blue 7 salt-forming dye]
(3) Resin: Marquid No. 33 [trade name, manufactured by Arakawa Chemical Industries, Ltd .: rosin-modified maleic resin]
(4) Cap-off additive 1: SY Glister TS-3S (trade name, manufactured by Sakamoto Pharmaceutical Co., Ltd .: polyglycerin fatty acid ester)
(5) Cap-off additive 2: Nikkor SS-10 [trade name, manufactured by Nikko Chemicals Co., Ltd .: sorbitan monostearate]
(6) Phosphate ester surfactant: Phosphanol RA-600 [trade name, manufactured by Toho Chemical Industry Co., Ltd .: polyoxyethylene alkyl ether phosphoric acid]
[0020]
A test ink is filled in a predetermined amount into an ink occlusion body coated with a polyester film, and a marking pen having a pen body made of a polyester fiber and a pen body made of an acrylic fiber having a porosity changed step by step is assembled. A cap-off test was performed. In the cap-off test, after confirming that each marking pen can be written normally, the cap was removed and left in a horizontal state for 7 days in an environment of a temperature of 20 ° C. and a relative humidity of 60%. Ten straight lines were written, and the distance from writing to normal writing was measured. The results of the cap-off test are shown in the following table.
[0021]
[Table 2]

[0022]
[Table 3]

[0023]
The evaluation criteria for the cap-off test are as follows.
：: Normal writing is possible without blurring from the start of writing.
：: Slight blurring was observed from the start, but recovered within 30 cm.
× The brush is rubbed by 30 cm or more after writing, or cannot be written.
[0024]
【The invention's effect】
As described above, the oil-based writing instrument of the present invention can write well without leaving the cap even if left for a long time with the cap removed.

Claims (4)

Coloring agent, an organic solvent, a resin soluble in the organic solvent, an oil-based ink containing a pen tip drying inhibitor, and a writing implement having a fiber pen body in which a fiber bundle is bound with a resin, wherein the fiber bundle is An oil-based writing instrument, comprising a bundle of acrylic synthetic fibers, wherein the porosity of the fiber pen body is 58 to 62%. Coloring agent, an organic solvent, a resin soluble in the organic solvent, an oil-based ink containing a pen tip drying inhibitor, and a writing implement having a fiber pen body in which a fiber bundle is bound with a resin, wherein the fiber bundle is An oil-based writing instrument, comprising a bundle of polyester-based synthetic fibers, wherein the porosity of the fiber pen body is 50 to 68%. 3. The oil-based writing instrument according to claim 1, wherein the organic solvent is one or a mixture of two or more aliphatic monohydric alcohols having 1 to 4 carbon atoms. The said nib drying inhibitor is selected from polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbite fatty acid ester, polyethylene glycol fatty acid ester, polyglycerin fatty acid ester, sorbitan fatty acid ester, fatty acid ester, paraffin wax. Item 3. The oil-based writing implement according to item 1 or 2.