JP2010065172A - Dot printing ink - Google Patents

Dot printing ink Download PDF

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Publication number
JP2010065172A
JP2010065172A JP2008234128A JP2008234128A JP2010065172A JP 2010065172 A JP2010065172 A JP 2010065172A JP 2008234128 A JP2008234128 A JP 2008234128A JP 2008234128 A JP2008234128 A JP 2008234128A JP 2010065172 A JP2010065172 A JP 2010065172A
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ink
silicone
fatty acid
acid
dot printing
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Makoto Furuya
眞 古谷
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Shachihata Inc
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Shachihata Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide dot printing ink without using fluorine-based surfactants which causes neither cissing nor bleeding even to lenses hard-coated with coatings based on silicone and fluorine, etc., and which allows dot printing to be completely and readily removed only by wiping with a cloth, etc., when becoming unnecessary, because ink using fluorine-based surfactants providing a load on health and environment has been hardly used in recent years. <P>SOLUTION: The dot printing ink includes one or more solvents, a colorant, and 0.1-0.9 wt.% of a silicone-based surfactant based on the total amount of the ink. The one or more solvents are selected from esters of a 14-20C saturated fatty acid or unsaturated fatty acid or a hydroxyfatty acid derived therefrom with a 1-4C aliphatic alcohol and ethers of a hydroxyfatty acid derived from a 14-20C saturated fatty acid or unsaturated fatty acid with a 1-4C aliphatic alcohol. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、ハードコートされた眼鏡レンズに用いる印点インキに関する。   The present invention relates to a marking ink used for a hard-coated spectacle lens.

従来より、眼鏡レンズには視点を明確にするために、メーカーの出荷時において、あらかじめ印点を施すことが行なわれている。印点の際は、インキを充填させた筆記具のようなマーカーや、多孔性ゴムにインキを含浸させた浸透印を用いるとインキをたびたび補充することなく連続して印点できるので有用であり、実開昭52−167306号などが知られている。しかし、近年シリコン系やフッ素系などの被膜でハードコートされたレンズが開発され、このようなレンズに対して従来の印点インキはハジキやニジミを生じるようになり、正確な印点業務に支障を生じるようになった。また、印点は販売時に跡が残らないよう完全に除去できることが求められるが、従来のインキは完全に除去することが困難であった。
そこで、本出願人はかかる欠点を克服した印点インキを発明し、特開平10−338828号として提案した。
しかし、当該発明は健康や環境に負荷を与えるとされるフッ素系界面活性剤が用いられているので、近年になって実施が難しくなっている。
Conventionally, in order to clarify the viewpoint of a spectacle lens, a mark is given in advance at the time of shipment from a manufacturer. When marking, it is useful to use a marker such as a writing instrument filled with ink or a penetrating mark impregnated with porous rubber, so that it can be continuously marked without replenishing the ink. Japanese Utility Model Publication No. 52-167306 is known. However, in recent years, lenses that have been hard-coated with silicon-based or fluorine-based coatings have been developed, and conventional marking inks for these lenses cause repelling and blurring, which hinders accurate marking operations. Came to occur. In addition, it is required that the mark can be completely removed so that no mark remains at the time of sale, but it has been difficult to completely remove the conventional ink.
Accordingly, the present applicant has invented a printing ink that overcomes such drawbacks and has proposed it as JP-A-10-338828.
However, since the present invention uses a fluorosurfactant that is considered to be a burden on health and the environment, it has become difficult to implement in recent years.

実開昭52−167306号公報Japanese Utility Model Publication No. 52-167306 特開平10−338828号公報JP-A-10-338828

そこで、本発明者は、シリコーン系やフッ素系などの被膜でハードコートされたレンズに対してもハジキやニジミを生じず、不要となった時は布等で拭き取るだけで完全かつ容易に印点が除去できる印点インキであって、フッ素系界面活性剤を用いない印点インキを発明した。   Therefore, the present inventor does not cause cissing or blurring even on a lens hard-coated with a silicone-based or fluorine-based coating, and when it is no longer needed, it can be completely and easily marked by simply wiping with a cloth. Ink ink that can be removed is a mark ink that does not use a fluorosurfactant.

炭素数14〜20の飽和脂肪酸もしくは不飽和脂肪酸又はこれらから誘導されるヒドロキシ脂肪酸と炭素数1〜4の脂肪族アルコールとのエステル、及び、炭素数14〜20の飽和脂肪酸又は不飽和脂肪酸から誘導されるヒドロキシ脂肪酸と炭素数1〜4の脂肪族アルコールとのエーテルから選ばれる1又は2以上の溶剤と、着色剤と、インキ全量に対して0.1〜0.9重量%のシリコーン系界面活性剤とからなる印点インキ。   Derived from saturated or unsaturated fatty acids having 14 to 20 carbon atoms or esters of hydroxy fatty acids derived therefrom and aliphatic alcohols having 1 to 4 carbon atoms, and saturated or unsaturated fatty acids having 14 to 20 carbon atoms One or two or more solvents selected from ethers of hydroxy fatty acids and aliphatic alcohols having 1 to 4 carbon atoms, a colorant, and a silicone-based interface of 0.1 to 0.9% by weight based on the total amount of ink Marking ink consisting of an activator.

本発明の印点インキは、ハードコート被膜を施した眼鏡レンズに印点したとき、ハジキもニジミも生じず、かつ、完全にインキを拭き取り除去できる効果を有するものである。   The marking ink of the present invention has the effect that when ink is marked on a spectacle lens provided with a hard coat film, neither cissing nor blurring occurs, and the ink can be completely wiped off.

以下、本発明を詳細に説明する。本発明では、炭素数14〜20の飽和脂肪酸もしくは不飽和脂肪酸又はこれらから誘導されるヒドロキシ脂肪酸と炭素数1〜4の脂肪族アルコールとのエステル、及び、炭素数14〜20の飽和脂肪酸又は不飽和脂肪酸から誘導されるヒドロキシ脂肪酸と炭素数1〜4の脂肪族アルコールとのエーテルから選ばれる1又は2以上の溶剤を用いることができる。前記の炭素数14〜20の飽和脂肪酸もしくは不飽和脂肪酸又はこれらから誘導されるヒドロキシ脂肪酸と炭素数1〜4の脂肪族アルコールとのエステルとは、具体的には、パルミチン酸、ステアリン酸等の飽和脂肪酸、もしくは、エレオステアリン酸、オレイン酸、リノール酸、リノレン酸等の不飽和脂肪酸、又は、前記飽和脂肪酸又は前記不飽和脂肪酸から誘導されるヒドロキシステアリン酸、リシノール酸等のヒドロキシ脂肪酸から任意に選定される脂肪酸と、メタノール、エタノール、n−プロパノール、イソプロパノール、n−ブタノール、イソブタノール、sec−ブタノール、tert−ブタノールから任意に選定される脂肪族アルコールとのエステルをいい、例えば、ステアリン酸メチル、オレイン酸エチル、リノール酸n−プロピル、リシノール酸n−ブチル等をあげることができる。前記の炭素数14〜20の飽和脂肪酸又は不飽和脂肪酸から誘導されるヒドロキシ脂肪酸と炭素数1〜4の脂肪族アルコールとのエーテルとは、具体的には、ヒドロキシステアリン酸、リシノール酸等から任意に選定されるヒドロキシ脂肪酸と、メタノール、エタノール、n−プロパノール、イソプロパノール、n−ブタノール、イソブタノール、sec−ブタノール、tert−ブタノールから任意に選定される脂肪族アルコールとのエーテルをいい、例えば、ヒドロキシステアリン酸メチルエーテル、リシノール酸エチルエーテル、ヒドロキシステアリン酸n−プロピルエーテル、リシノール酸n−ブチルエーテル等をあげることができる。本発明では、前記エステル及び前記エーテルからなる溶剤群から任意に選ばれる1又は2以上の溶剤を用いることができる。これらの溶剤は、不乾性溶剤なので、インキのドライアップを防止し、インキが眼鏡レンズに固着することを防止する。また、インキを乾燥固化させないので、眼鏡レンズからのインキの拭き取りを容易にする。本発明において、前記溶剤はインキ全量に対して40〜99重量%使用することができが、好ましい範囲は、60〜95重量%である。   Hereinafter, the present invention will be described in detail. In the present invention, an ester of a saturated or unsaturated fatty acid having 14 to 20 carbon atoms or a hydroxy fatty acid derived therefrom and an aliphatic alcohol having 1 to 4 carbon atoms, and a saturated or unsaturated fatty acid having 14 to 20 carbon atoms. One or two or more solvents selected from ethers of hydroxy fatty acids derived from saturated fatty acids and aliphatic alcohols having 1 to 4 carbon atoms can be used. The saturated fatty acid having 14 to 20 carbon atoms or unsaturated fatty acid or the ester of hydroxy fatty acid derived therefrom and aliphatic alcohol having 1 to 4 carbon atoms specifically includes palmitic acid, stearic acid and the like. Arbitrary fatty acids such as saturated fatty acids, unsaturated fatty acids such as eleostearic acid, oleic acid, linoleic acid, linolenic acid, or hydroxy fatty acids such as hydroxystearic acid and ricinoleic acid derived from the saturated fatty acids or unsaturated fatty acids And an aliphatic alcohol arbitrarily selected from methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, and tert-butanol. For example, stearic acid Methyl, ethyl oleate, linoleic acid n Propyl may be mentioned ricinoleic acid n- butyl. The ether of hydroxy fatty acid derived from saturated fatty acid having 14 to 20 carbon atoms or unsaturated fatty acid and aliphatic alcohol having 1 to 4 carbon atoms is specifically selected from hydroxystearic acid, ricinoleic acid and the like. And an aliphatic alcohol selected arbitrarily from methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, and tert-butanol. For example, hydroxy Examples include stearic acid methyl ether, ricinoleic acid ethyl ether, hydroxystearic acid n-propyl ether, and ricinoleic acid n-butyl ether. In this invention, the 1 or 2 or more solvent arbitrarily chosen from the solvent group which consists of the said ester and the said ether can be used. Since these solvents are non-drying solvents, they prevent the ink from drying up and prevent the ink from adhering to the spectacle lens. Further, since the ink is not dried and solidified, the ink can be easily wiped off from the spectacle lens. In the present invention, the solvent can be used in an amount of 40 to 99% by weight based on the total amount of the ink, but a preferred range is 60 to 95% by weight.

着色剤としては、公知の顔料及び油溶性染料の中から任意の1又は2以上を選択して使用することができる。顔料としては、特に制限されることなく従来公知の有機顔料及び無機顔料を使用することができ、例えば、アゾ系、フタロシアニン系、キナクリドン系、アントラキノン系、ジオキサジン系、インジゴ・チオインジゴ系、ベリノン・ベリレン系、イソインドレノン系、アゾメチレンアゾ系などの有機顔料や、カーボンブラック、マイカ、チタン白、パール顔料、酸化鉄・アルミニウム粉・真鍮等金属顔料などの無機顔料を用いることができる。これらの顔料は、ロジン、ロジンエステル、ロジン誘導体、フェノール樹脂、エチルセルロース、ニトロセルロース、ケトン樹脂、塩化ビニル、酢酸ビニル、塩化ビニル−酢酸ビニル共重合体、ポリアクリル酸、ポリメタクリル酸、スチレン−アクリル酸共重合体、ポリビニルブチラールなどの顔料分散剤や、他の公知の顔料分散剤などに練り込んで加工顔料としておくと溶剤と混合する際に容易に分散するので便利である。また、既に分散剤中に顔料を練り込んである市販の加工顔料を用いても良好な結果が得られる。染料としては、特に制限されることなく従来公知の油溶性染料を使用することができ、例えば、モノアゾ系、ジスアゾ系、金属錯塩型モノアゾ系、アントラキノン系、フタロシアニン系、トリアリルメタン系などを用いることができる。本発明ではいわゆるインキ分かれが生じにくいので、色合いを勘案しながら前記顔料及び前記油溶性染料の着色剤群から選ばれる1又は2以上の着色剤を任意に選定して使用することができる。本発明において、前記着色剤はインキ全量に対して0.5〜20重量%使用することができる。   As a coloring agent, arbitrary 1 or 2 or more can be selected and used from a well-known pigment and oil-soluble dye. As the pigment, any conventionally known organic pigments and inorganic pigments can be used without any particular limitations. Organic pigments such as carbon black, isoindolenone, and azomethylene azo, and inorganic pigments such as carbon black, mica, titanium white, pearl pigments, metal pigments such as iron oxide, aluminum powder, and brass. These pigments are rosin, rosin ester, rosin derivative, phenol resin, ethyl cellulose, nitrocellulose, ketone resin, vinyl chloride, vinyl acetate, vinyl chloride-vinyl acetate copolymer, polyacrylic acid, polymethacrylic acid, styrene-acrylic. If it is kneaded in a pigment dispersant such as an acid copolymer or polyvinyl butyral or other known pigment dispersants to prepare a processed pigment, it is easy to disperse when mixed with a solvent. Good results can also be obtained by using commercially available processed pigments that have already been kneaded into the dispersant. As the dye, any conventionally known oil-soluble dye can be used without any particular limitation, and for example, monoazo, disazo, metal complex monoazo, anthraquinone, phthalocyanine, triallylmethane, etc. are used. be able to. In the present invention, so-called ink separation is unlikely to occur, and therefore one or two or more colorants selected from the colorant group of the pigment and the oil-soluble dye can be arbitrarily selected and used in consideration of the hue. In the present invention, the colorant can be used in an amount of 0.5 to 20% by weight based on the total amount of ink.

他に本発明では、シリコーン系界面活性剤が必須構成要素であり、例えば、ジメチルシリコーン、環状シリコーン、トリメチルシロキケイ酸、メチルフェニルシリコーン、ポリエーテル変性シリコーン、アルコール変性シリコーン、メチルスチリル変性シリコーン、アルキル変性シリコーン、高級脂肪酸エステル変性シリコーン、高級アルコキシ変性シリコーンなどが好ましく用いられる。
市販のものとしては、KF−351A、KF−352A、KF−353、KF−354L、KF−355A、KF−615A、KF−945、KF−640、KF−642、KF−643、KF−6020、KF−6011、KF−6012、KF−6015、KF−6017、KF−410、KF−412、KF−413、KF−414、KF−415、KF−4003、KF−4701、KF−4917、KF−7235B、KF−910、KF−3935、KF−53、KF−54、KF−6004、KF−889(以上、信越化学工業(株)製)、SILWET L−720、同L−7001、同L−7002、同Y−7006、同FZ−2101、同FZ−2120、同FZ−2123、同FZ−2130、同FZ−2154、同FZ−2164、同FZ−3711、同FZ−3722(以上、日本ユニカー(株)製)、TSF4440、同4445、同4446、YF3842(以上、ジーイー東芝シリコーン(株)製)、SH3746、SH3749、SH3771、SH8400、SF8410、SF8700、SF8427、SF8428(以上、東レ・ダウコーニング・シリコーン(株)製)、BYK−300、同301、同302、同306、同307、同331、同332、同333、同335、同337、同341、同DYNWET800(以上、ビックケミー(株)製)などが好ましく用いられる。
当該シリコーン系界面活性剤は、インキ全量に対して0.1〜1.0重量%使用させることができる。ハードコートが施された眼鏡レンズにおいて、前記シリコーン系界面活性剤が0.1重量%より少ない場合はインキのハジキが生じてしまい、0.9重量%より多い場合はインキのニジミが生じてしまうので好ましくない。インキのバランスを考慮すると特に好ましい範囲は、0.3〜0.7重量%である。
In addition, in the present invention, a silicone-based surfactant is an essential component, such as dimethyl silicone, cyclic silicone, trimethylsiloxysilicate, methylphenyl silicone, polyether-modified silicone, alcohol-modified silicone, methylstyryl-modified silicone, alkyl Modified silicone, higher fatty acid ester-modified silicone, higher alkoxy-modified silicone and the like are preferably used.
Commercially available products include KF-351A, KF-352A, KF-353, KF-354L, KF-355A, KF-615A, KF-945, KF-640, KF-642, KF-643, KF-6020, KF-6011, KF-6012, KF-6015, KF-6017, KF-410, KF-412, KF-413, KF-414, KF-415, KF-4003, KF-4701, KF-4917, KF- 7235B, KF-910, KF-3935, KF-53, KF-54, KF-6004, KF-889 (manufactured by Shin-Etsu Chemical Co., Ltd.), SILWET L-720, L-7001, L- 7002, Y-7006, FZ-2101, FZ-2120, FZ-2123, FZ-2130, FZ-2154, FZ Z-2164, FZ-3711, FZ-3722 (manufactured by Nihon Unicar), TSF4440, 4445, 4446, YF3842 (manufactured by GE Toshiba Silicone), SH3746, SH3749, SH3771 SH8400, SF8410, SF8700, SF8427, SF8428 (manufactured by Toray Dow Corning Silicone Co., Ltd.), BYK-300, 301, 302, 306, 307, 331, 332, 333, 335, 337, 341, DYNWET800 (manufactured by Big Chemie Co., Ltd.) and the like are preferably used.
The silicone-based surfactant can be used in an amount of 0.1 to 1.0% by weight based on the total amount of ink. In a spectacle lens to which a hard coat is applied, ink repelling occurs when the silicone-based surfactant is less than 0.1% by weight, and ink smearing occurs when it is greater than 0.9% by weight. Therefore, it is not preferable. Considering the ink balance, a particularly preferable range is 0.3 to 0.7% by weight.

本発明には他に、ジブチルヒドロキシトルエン等の酸化防止剤や、チアベンダゾール等の防腐・防かび剤、ロジン、ロジンエステル、ロジン誘導体、フェノール樹脂、エチルセルロース、ニトロセルロース、ケトン樹脂、塩化ビニル、酢酸ビニル、塩化ビニル−酢酸ビニル共重合体、ポリアクリル酸、ポリメタクリル酸、スチレン−アクリル酸共重合体、ポリビニルブチラール等の顔料分散剤などを任意に配合することができる。   In addition to the present invention, other antioxidants such as dibutylhydroxytoluene, antiseptic and fungicides such as thiabendazole, rosin, rosin ester, rosin derivative, phenol resin, ethyl cellulose, nitrocellulose, ketone resin, vinyl chloride, vinyl acetate A pigment dispersant such as vinyl chloride-vinyl acetate copolymer, polyacrylic acid, polymethacrylic acid, styrene-acrylic acid copolymer, polyvinyl butyral, and the like can be optionally blended.

以下、本発明を実施例をもって説明するが、もちろん実施例に拘泥されるものでない。   Hereinafter, although this invention is demonstrated with an Example, of course, it is not restricted to an Example.

リシノール酸メチル 90.0重量%
カーボンブラック 6.0重量%
KF−945(信越化学工業製シリコーン系界面活性剤) 0.4重量%
ロジンエステル 3.0重量%
ジブチルヒドロキシトルエン 0.6重量%
上記のカーボンブラックとロジンエステルを三本ロールに投入し混合した後、これをプロペラ攪拌機にて残りの物質と混合して黒色インキを得た。
Methyl ricinoleate 90.0% by weight
Carbon black 6.0% by weight
KF-945 (Shin-Etsu Chemical silicone surfactant) 0.4% by weight
Rosin ester 3.0% by weight
Dibutylhydroxytoluene 0.6% by weight
The above carbon black and rosin ester were put into a three-roll roll and mixed, and then mixed with the remaining substances with a propeller stirrer to obtain a black ink.

リノール酸n−ブチル 95.0重量%
ニグロシン 4.0重量%
SH3749(東レ・ダウコーニング・シリコーン製) 0.5重量%
ジブチルヒドロキシトルエン 0.5重量%
上記の物質をプロペラ攪拌機にて混合して黒色インキを得た。
N-Butyl linoleate 95.0% by weight
Nigrosine 4.0% by weight
SH3749 (made by Toray Dow Corning Silicone) 0.5% by weight
Dibutylhydroxytoluene 0.5% by weight
The above substances were mixed with a propeller stirrer to obtain a black ink.

ステアリン酸エチル 40.0重量%
リシノール酸イソプロピルエーテル 40.0重量%
カーボンブラック 10.0重量%
BYK−331(ビックケミー製シリコーン系界面活性剤) 0.6重量%
ニトロセルロース 9.0重量%
ジブチルヒドロキシトルエン 0.4重量%
上記のカーボンブラックとニトロセルロースを三本ロールに投入し混合した後、これをプロペラ攪拌機にて残りの物質と混合して黒色インキを得た。
Ethyl stearate 40.0% by weight
Ricinoleic acid isopropyl ether 40.0% by weight
Carbon black 10.0% by weight
BYK-331 (Silicon-based surfactant manufactured by Big Chemie) 0.6% by weight
Nitrocellulose 9.0% by weight
Dibutylhydroxytoluene 0.4% by weight
The above carbon black and nitrocellulose were put into a three roll and mixed, and then mixed with the remaining substances with a propeller stirrer to obtain a black ink.

(比較例1)
実施例1からKF355(信越化学工業製シリコーン系界面活性剤)を除いて同様の黒色インキを作成した。
(Comparative Example 1)
A black ink was prepared in the same manner as in Example 1 except for KF355 (a silicone surfactant manufactured by Shin-Etsu Chemical Co., Ltd.).

(比較例2)
実施例1のKF355(信越化学工業製シリコーン系界面活性剤)を1.0重量%に増量して同様の黒色インキを作成した。
(Comparative Example 2)
A similar black ink was prepared by increasing the amount of KF355 of Example 1 (silicone surfactant manufactured by Shin-Etsu Chemical Co., Ltd.) to 1.0% by weight.

以下、実施例1〜3、及び、比較例1〜2の試験結果を表1に示す。試験は、連続気泡を有する多孔性ゴムに上記各インキを含浸させたものを用いて印点した。対象物は、シリコン系ハードコート被膜を施した眼鏡レンズを使用した。   The test results of Examples 1 to 3 and Comparative Examples 1 and 2 are shown in Table 1 below. The test was marked using a porous rubber having open cells impregnated with the above inks. The object used was a spectacle lens provided with a silicon hard coat film.

(表1)

Figure 2010065172
(Table 1)
Figure 2010065172

Claims (1)

炭素数14〜20の飽和脂肪酸もしくは不飽和脂肪酸又はこれらから誘導されるヒドロキシ脂肪酸と炭素数1〜4の脂肪族アルコールとのエステル、及び、炭素数14〜20の飽和脂肪酸又は不飽和脂肪酸から誘導されるヒドロキシ脂肪酸と炭素数1〜4の脂肪族アルコールとのエーテルから選ばれる1又は2以上の溶剤と、着色剤と、インキ全量に対して0.1〜0.9重量%のシリコーン系界面活性剤とからなる印点インキ。   Derived from saturated or unsaturated fatty acids having 14 to 20 carbon atoms or esters of hydroxy fatty acids derived therefrom and aliphatic alcohols having 1 to 4 carbon atoms, and saturated or unsaturated fatty acids having 14 to 20 carbon atoms One or two or more solvents selected from ethers of hydroxy fatty acids and aliphatic alcohols having 1 to 4 carbon atoms, a colorant, and a silicone-based interface of 0.1 to 0.9% by weight based on the total amount of ink Marking ink consisting of an activator.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6134080A (en) * 1984-07-25 1986-02-18 Orient Kagaku Kogyo Kk Marking ink for writing board
JPH10338828A (en) * 1997-06-09 1998-12-22 Shachihata Inc Dot printing ink
JPH11335612A (en) * 1998-05-25 1999-12-07 Shachihata Inc Oil ink for marking pen
JP2001240788A (en) * 2000-02-29 2001-09-04 Shachihata Inc Oil based fluorescent ink for marking pen
JP2008001832A (en) * 2006-06-23 2008-01-10 Pilot Ink Co Ltd Aqueous ink composition for writing implement and writing implement building it in
JP2008208290A (en) * 2007-02-28 2008-09-11 Pilot Ink Co Ltd Oil-based ink composition for writing implement and marking pen containing the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6134080A (en) * 1984-07-25 1986-02-18 Orient Kagaku Kogyo Kk Marking ink for writing board
JPH10338828A (en) * 1997-06-09 1998-12-22 Shachihata Inc Dot printing ink
JPH11335612A (en) * 1998-05-25 1999-12-07 Shachihata Inc Oil ink for marking pen
JP2001240788A (en) * 2000-02-29 2001-09-04 Shachihata Inc Oil based fluorescent ink for marking pen
JP2008001832A (en) * 2006-06-23 2008-01-10 Pilot Ink Co Ltd Aqueous ink composition for writing implement and writing implement building it in
JP2008208290A (en) * 2007-02-28 2008-09-11 Pilot Ink Co Ltd Oil-based ink composition for writing implement and marking pen containing the same

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