JPH0425498A - Writing instrument - Google Patents
Writing instrumentInfo
- Publication number
- JPH0425498A JPH0425498A JP2130500A JP13050090A JPH0425498A JP H0425498 A JPH0425498 A JP H0425498A JP 2130500 A JP2130500 A JP 2130500A JP 13050090 A JP13050090 A JP 13050090A JP H0425498 A JPH0425498 A JP H0425498A
- Authority
- JP
- Japan
- Prior art keywords
- color
- container
- producing
- coloring
- alkaline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 33
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 12
- 239000007793 ph indicator Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011780 sodium chloride Substances 0.000 claims abstract description 6
- 238000004040 coloring Methods 0.000 claims description 29
- 239000003086 colorant Substances 0.000 claims description 13
- 239000003463 adsorbent Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 description 9
- 230000002378 acidificating effect Effects 0.000 description 7
- 238000001035 drying Methods 0.000 description 5
- 239000000976 ink Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 210000004400 mucous membrane Anatomy 0.000 description 4
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000007794 irritation Effects 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000004383 yellowing Methods 0.000 description 2
- VADKRMSMGWJZCF-UHFFFAOYSA-N 2-bromophenol Chemical compound OC1=CC=CC=C1Br VADKRMSMGWJZCF-UHFFFAOYSA-N 0.000 description 1
- CPBJMKMKNCRKQB-UHFFFAOYSA-N 3,3-bis(4-hydroxy-3-methylphenyl)-2-benzofuran-1-one Chemical compound C1=C(O)C(C)=CC(C2(C3=CC=CC=C3C(=O)O2)C=2C=C(C)C(O)=CC=2)=C1 CPBJMKMKNCRKQB-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- LDKDGDIWEUUXSH-UHFFFAOYSA-N Thymophthalein Chemical compound C1=C(O)C(C(C)C)=CC(C2(C3=CC=CC=C3C(=O)O2)C=2C(=CC(O)=C(C(C)C)C=2)C)=C1C LDKDGDIWEUUXSH-UHFFFAOYSA-N 0.000 description 1
- SLINHMUFWFWBMU-UHFFFAOYSA-N Triisopropanolamine Chemical compound CC(O)CN(CC(C)O)CC(C)O SLINHMUFWFWBMU-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004042 decolorization Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- LVTYICIALWPMFW-UHFFFAOYSA-N diisopropanolamine Chemical compound CC(O)CNCC(C)O LVTYICIALWPMFW-UHFFFAOYSA-N 0.000 description 1
- 229940043276 diisopropanolamine Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- -1 jetanolamine Chemical compound 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- RBXVOQPAMPBADW-UHFFFAOYSA-N nitrous acid;phenol Chemical class ON=O.OC1=CC=CC=C1 RBXVOQPAMPBADW-UHFFFAOYSA-N 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 1
Landscapes
- Toys (AREA)
- Pens And Brushes (AREA)
- Color Printing (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、使用に際しての安全性を高める一方、アルカ
リＰＨ指示薬を主成分とする発色剤を用いた例えば文字
等を繰り返して発色できかつ発色した前記文字等が自然
消色するまでの消色時間を短縮化しつる筆記具に関する
。[Detailed Description of the Invention] [Industrial Application Field] The present invention improves the safety in use, and at the same time, it is possible to develop color by repeating letters, etc. using a coloring agent containing an alkaline pH indicator as a main component. The present invention relates to a writing instrument which shortens the erasing time until the characters and the like are naturally erased.
例えばフェノールフタレイン等のアルカリＰＨ指示薬を
主成分としたインキ等の発色剤を用いて文字、絵などを
無色に印刷し、これに該発色剤と反応するアルカリ性の
発色助剤を塗布することにより無色から可視に変色させ
るいわゆるｒＩｌシ文字ｊ、「隠し絵ｊ等が広く知られ
ている。For example, by printing letters, pictures, etc. colorlessly using a coloring agent such as ink whose main component is an alkaline pH indicator such as phenolphthalein, and then coating this with an alkaline coloring aid that reacts with the coloring agent. The so-called ``rIl character j'' and ``hidden picture j'' that change color from colorless to visible are widely known.
他方、近年、このような隠し文字等を例えば学習用書物
等に用い、勉学への興味を高めるとともに、記憶力、判
断力を養成することが提案されている。On the other hand, in recent years, it has been proposed to use such hidden characters, for example, in books for learning, to increase interest in studying and to develop memory and judgment skills.
しかしながら、このようなものにあっては、特に発色助
剤には隠し文字等を発色させるに加え、発色した該隠し
文字を黄ばみ等変色さセることなく実質的に不可視の無
色状に短時間のうちに自然消色させる機能が要求され、
しかもこのような発色、消色は多数回繰返しうろことが
必要である。However, in such products, in addition to coloring the hidden characters, the coloring aid is used to transform the colored hidden characters into a virtually invisible colorless state for a short period of time without yellowing or other discoloration. A function that naturally fades color is required,
Furthermore, it is necessary to repeat this process of coloring and decoloring many times.
又発色助剤は、液状をなしかつ使用者によって塗布され
るため、誤操作による体等への付着も考えられ、従って
、特に刺激に弱い目、腔内等の粘膜を含む人体への高い
安全性が望まれるなど、実使用のためには解決すべき多
くの問題点がある。In addition, since the coloring aid is in liquid form and is applied by the user, there is a possibility that it may adhere to the body due to incorrect operation.Therefore, it is highly safe for the human body, including the eyes and mucous membranes in cavities, which are particularly susceptible to irritation. There are many problems that need to be solved for practical use, such as the desire to
本発明は、発色剤を多数回に亘り繰返して発色、消色さ
せることができかつ発色状態からの短時間での消色を可
能とするとともにその使用に際しての安全性を向上した
筆記具の提供を目的としている。The present invention aims to provide a writing instrument that can be repeatedly colored and decolored with a coloring agent many times, can be decolored in a short time from a coloring state, and has improved safety when using the writing instrument. The purpose is
前記目的を達成するために本発明の筆記具は、アルカリ
ＰＨ指示薬を含む発色剤と反応することにより該発色剤
を実施的に不可視の無色から可視の有色に発色させうる
発色助剤を取出し自在に収容した容器内に、活性炭から
なる吸着剤を添加するとともに、前記発色助剤は水中に
２−ジメチルアミノエタールを４以上かつ２０重量％以
下、クエン酸を０．０５以上かつ３重量％以下、及び塩
化ナトリウムを０．０５以上かつ３重量％以下含んでい
る。In order to achieve the above object, the writing instrument of the present invention is provided with a color-forming aid that is capable of reacting with a color-forming agent containing an alkaline pH indicator to actually color the color-forming agent from an invisible colorless color to a visible colored color. In the container, an adsorbent made of activated carbon is added, and the coloring aids include 4 or more and 20% by weight of 2-dimethylaminoethal in water, 0.05 or more and 3% by weight or less of citric acid, and sodium chloride in an amount of 0.05 or more and 3% by weight or less.
このように構成する筆記具に用いる発色助剤は、水中に
、アルカリ性物質である２−ジメチルアミノエタノール
と酸性＄５Ｗであるクエン酸とを所定量含有することに
より、その含有比に起因してアルカリ性を呈する。従っ
て発色助剤は、発色剤に含まれるアルカリＰＨ指示薬と
反応して該発色剤を鮮明に発色させる。又２−ジメチル
アミノエタノールは、水分の乾燥が進みその濃度がある
値をこえて上昇した際、イオン解離能力を失する性質、
邪ち塗布された発色助剤の乾燥途中においてアルカリ性
を示さなくなる性質があり、従うて発色した発色剤を短
時間のうちに自然消色しうる。The coloring aid used in the writing instrument constructed in this way contains a predetermined amount of 2-dimethylaminoethanol, which is an alkaline substance, and citric acid, which is acidic, in water, so that it becomes alkaline due to the content ratio. exhibits. Therefore, the coloring aid reacts with the alkaline pH indicator contained in the coloring agent to cause the coloring agent to develop a vivid color. In addition, 2-dimethylaminoethanol has the property of losing its ion dissociation ability when its concentration increases beyond a certain value as water dries.
The applied coloring aid has a property of not exhibiting alkalinity during drying, and therefore the coloring agent can be naturally discolored within a short period of time.
又クエン酸は、不揮発性であるため、略乾燥後において
発色助剤を酸性側に移行させ、消色時間の短縮化をより
促進させるとともに消色した発色剤を不可視の無色状に
安定して維持しろる。In addition, since citric acid is non-volatile, it moves the coloring aid to the acidic side after drying, further promoting the shortening of the erasing time, and stabilizing the erased coloring agent in an invisible colorless state. I'll maintain it.
しかも前記２−ジメチルアミノエタノールはアルカリ性
物質の中でも刺激性が小であり、又発色助剤は塩化ナト
リウムを含むため、特に目、腔内等の粘膜に炎症を発生
させることがなく安全性を大巾に向上しうる。Moreover, the 2-dimethylaminoethanol is less irritating among alkaline substances, and since the coloring aid contains sodium chloride, it does not cause irritation to the eyes or mucous membranes, making it extremely safe. It can be greatly improved.
以下本発明の一実施例を図面に基づき説明する。 An embodiment of the present invention will be described below based on the drawings.
図において筆記具１は、発色助剤と吸着剤とを容器２内
に収容したペン状をなし、本例では容器２先端に設ける
例えばフェルト状のペン先部３が有する毛細管現象を用
いて内部の発色助剤を取り出すとともに、該取出された
発色助剤を、例えばシート体に印刷した隠し文字等に塗
布することによって該隠し文字等を発色させる。In the figure, a writing instrument 1 has a pen shape in which a color development aid and an adsorbent are housed in a container 2. In this example, the writing instrument 1 uses the capillary phenomenon of a felt-like pen point 3 provided at the tip of the container 2 to The coloring aid is taken out, and the removed coloring aid is applied to, for example, hidden characters printed on a sheet body, thereby coloring the hidden characters.
ここで前記隠し文字等を印刷する発色剤としては、アル
カリ性のあるＰＨ５Ｉ域において発色しかつそれより低
いＰＨ領領域おいて無色をなすアルカリＰＨ指示薬、例
えば第１表に示すρ−ニトロフェノール、ｍ−ニトロフ
ェノール、シアニン、α−ナットールフタレイン、エチ
ルビス酢酸、フェノールフタレイン、クレゾールフタレ
イン、チモールフタレイン、ブロムフェノールパープル
等の一種もしくは複数種を主成分として含む、又発色剤
は、彩色変化を鮮明としかつ退色を防止する第
表
ために、多価アルコール、例えばエチレングリコール、
プロピレングリコール、ポリエチレングリコール、グリ
セリン等を前記アルカリＰＨ指示薬とともに約５〜５０
重量％の濃度で含む溶液として使用することが好ましく
、さらに界面活性炭、各欄の樹脂類等を添加することに
より発色インクとして使用する。Here, the color former for printing the hidden characters etc. is an alkaline pH indicator that develops color in the alkaline pH5I range and is colorless in the lower pH range, such as ρ-nitrophenol shown in Table 1, m - Contains one or more of nitrophthalein, cyanine, α-natholphthalein, ethylbisacetic acid, phenolphthalein, cresolphthalein, thymolphthalein, bromophenol purple, etc. as a main component, and the coloring agent changes color To brighten the color and prevent fading, polyhydric alcohols such as ethylene glycol,
Propylene glycol, polyethylene glycol, glycerin, etc. together with the alkaline pH indicator at a pH of about 5 to 50%.
It is preferable to use it as a solution containing it at a concentration of % by weight, and by further adding surface activated carbon, resins listed in each column, etc., it is used as a coloring ink.
なお例えばニトロフェノール類のように、発色するＰＨ
９域が中性に近いものについては、予め希硫酸、酒石酸
、クエン酸等の不揮発性の酸性物質によって発色インク
のＰＨを低く調整し、印刷後の変色を防止する。For example, nitrophenols, which develop color at pH
For inks that are close to neutral in the 9 region, the pH of the coloring ink is adjusted low in advance using a nonvolatile acidic substance such as dilute sulfuric acid, tartaric acid, or citric acid to prevent discoloration after printing.
そして例えばこのような発色インクを用いて実質的に無
色に印刷した隠し文字等を繰返して発色、消色させるた
めに本発明の筆記具１が用いられる。For example, the writing instrument 1 of the present invention is used to repeatedly color and decolor hidden characters printed substantially colorless using such coloring ink.
前記筆記具１に収容される発色助剤は、アルカリ性の水
溶液であって、自然消色のために、時間の経過とともに
アルカリ性を失する経時的失効性を有するものが用いら
れる。The coloring aid contained in the writing instrument 1 is an alkaline aqueous solution, which has the ability to lose its alkalinity over time for natural decolorization.
又経時的な失効には、揮発によるもの或いは水分の蒸発
による乾燥によるものがあるが、本発明では、取扱い性
、安定性等の観点から乾燥によるものを使用する。In addition, expiration over time can be caused by volatilization or by drying due to evaporation of water, but in the present invention, from the viewpoint of ease of handling, stability, etc., the expiry caused by drying is used.
なお水分の乾燥による失効は、イオン解離能力を失うこ
とを利用する。このような性質を有するアルカリ物質は
数多く存在するが、短時間で完全に水分を乾燥させるこ
とは困難であり、従って本発明者は、濃度がある値を超
えることによってイオン解離能力を失うもの、例えばジ
イソプロパツールアミン、トリイソプロパツールアミン
、ジェタノールアミン、水酸化ナトリウム、水酸化カリ
ウム等に着目して研究をおし進めた。Note that the loss of ion dissociation ability due to drying of water is utilized. Although there are many alkaline substances that have such properties, it is difficult to completely dry the water in a short period of time. For example, research focused on diisopropanolamine, triisopropanolamine, jetanolamine, sodium hydroxide, potassium hydroxide, etc.
その結果、２−ジメチルアミノエタノールが比較的刺激
性が弱く、誤操作等により例えば目、腔内等の粘膜に付
着した際にもその炎症を防止でき、実使用が可能である
ことを見出し得た。As a result, we found that 2-dimethylaminoethanol is relatively less irritating and can be used in practice, as it can prevent inflammation even when it comes into contact with the mucous membranes of the eyes, cavities, etc. due to incorrect operation, etc. .
従って前記発色助剤は、水中に前記２−ジメチルアミノ
エタノールを４以上かつ２０重量％以下含むものであり
、本発明では消色時間をさらに短縮化しかつ人体への安
全性を高めるために０．０５以上かつ３重量％以下のク
エン酸と、０．０５以上かつ３重量％以下の塩化ナトリ
ウムとを含有している。このクエン酸は、前記のごとく
不揮発性の酸性物質であり、長時間に亘り酸性効果を持
続させる。Therefore, the coloring aid contains 4 or more and 20% by weight or less of the 2-dimethylaminoethanol in water, and in the present invention, the color development aid contains 4 or more and 20% by weight or less of the 2-dimethylaminoethanol. It contains citric acid of 0.05 or more and 3% by weight or less, and sodium chloride of 0.05 or more and 3% by weight or less. As mentioned above, this citric acid is a non-volatile acidic substance and maintains its acidic effect for a long time.
即ちクエン酸は、乾燥量中における２−ジメチルアミノ
エタノールのアルカリ効力の失効の際、発色助剤をアル
カリ性側から酸性側に移行させ、このことにより完全な
消色と消色時間の短縮とを可能とする。又消色後におい
ては、発色剤の不可視状態を長時間に亘り確実に維持す
る。又塩化ナトリウムは発色助剤の人体、特に粘膜等へ
の刺激性をさらに緩和し、前記２−ジメチルアミノエタ
ノールの採用及びクエン酸によるアルカリ性側から酸性
側への移行効果とともに、安全性をより向上させ発色助
剤の実使用を可能とする。That is, when the alkaline effect of 2-dimethylaminoethanol in the dry amount expires, citric acid causes the coloring aid to shift from the alkaline side to the acidic side, thereby achieving complete color erasure and shortening of the color erasing time. possible. Moreover, after decoloring, the invisible state of the coloring agent is reliably maintained for a long time. In addition, sodium chloride further reduces the irritation of the coloring aid to the human body, especially mucous membranes, etc., and together with the use of 2-dimethylaminoethanol and the effect of citric acid to shift from the alkaline side to the acidic side, safety is further improved. This makes it possible to actually use color development aids.
又該発色助剤とともに容器２内に収容される適量の活性
炭は、２−ジメチルアミノエタノールとクエン酸との間
の化学反応によって発色助剤中に現れる沈澱物等の不純
物を吸着し、発色助剤及びペン先部３が時間の経過とと
もに黄変し劣化するのを防止しうる。In addition, an appropriate amount of activated carbon contained in the container 2 together with the coloring aid adsorbs impurities such as precipitates that appear in the coloring aid due to the chemical reaction between 2-dimethylaminoethanol and citric acid, thereby creating a coloring aid. It is possible to prevent the agent and the pen tip portion 3 from yellowing and deteriorating over time.
なおこのｃＡうな発色助剤の容器２からの取出し；よ第
２図に示すごとく、フェルト状のペン先部３の他、７・
ズル状のペン先部３Ａを設けることにより行ってもよく
、又第３図に示すようにペン先部３Ｂを筆先状に形成し
うるなと種々の取出し手段で採用しうる。When taking out the cA coloring aid from the container 2, as shown in FIG. 2, in addition to the felt-like pen tip 3,
This may be done by providing a pen tip portion 3A with a curved shape, or by forming the pen tip portion 3B in the shape of a brush tip, as shown in FIG.
軟土のごと（本発明の筆記具は、特に容器に取出し自在
に収容した発色助剤の成分及び成分量を特定しているた
め、アルカリＰＨ指示薬を含む発色剤を多数回に亘り繰
返して発色、消色させることができ、かつ消色時間を大
巾に短縮しうるとともにその使用に際しての安全性を向
上しうる。Like soft clay (the writing instrument of the present invention specifies the components and amount of the coloring aid that is removably stored in the container, so the coloring agent containing the alkaline PH indicator is repeatedly applied many times to develop the color, The color can be erased, the time for color erasure can be greatly shortened, and the safety in use can be improved.
第１図は本発明の一実施例を示す断面図、第２〜３図は
本発明の他の実施例を示す断面図である。
２・−容器、 ３．３Ａ、３Ｂ−ペン先部。FIG. 1 is a sectional view showing one embodiment of the invention, and FIGS. 2 and 3 are sectional views showing other embodiments of the invention. 2.-Container, 3.3A, 3B-Nib portion.
Claims (1)
より該発色剤を実施的に不可視の無色から可視の有色に
発色させうる発色助剤を取出し自在に収容した容器内に
、活性炭からなる吸着剤を添加するとともに、前記発色
助剤は水中に２−ジメチルアミノエタールを４以上かつ
２０重量％以下、クエン酸を０．０５以上かつ３重量％
以下、及び塩化ナトリウムを０．０５以上かつ３重量％
以下含むことを特徴とした筆記具。1. An adsorbent made of activated carbon is placed in a container that removably contains a coloring aid that can change the coloring agent from an invisible colorless color to a visible colored color by reacting with a coloring agent containing an alkaline pH indicator. In addition, the coloring aids include 4 or more and 20% by weight of 2-dimethylaminoethal and 0.05 or more and 3% by weight of citric acid in water.
and 0.05 or more and 3% by weight of sodium chloride
A writing instrument characterized by including the following:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2130500A JPH0425498A (en) | 1990-05-21 | 1990-05-21 | Writing instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2130500A JPH0425498A (en) | 1990-05-21 | 1990-05-21 | Writing instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0425498A true JPH0425498A (en) | 1992-01-29 |
Family
ID=15035758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2130500A Pending JPH0425498A (en) | 1990-05-21 | 1990-05-21 | Writing instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0425498A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003072278A (en) * | 2001-09-05 | 2003-03-12 | Mitsubishi Pencil Co Ltd | Writing utensil |
| JP2005344003A (en) * | 2004-06-03 | 2005-12-15 | Satoshi Akaha | Drawing material developing color by coating color former |
-
1990
- 1990-05-21 JP JP2130500A patent/JPH0425498A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003072278A (en) * | 2001-09-05 | 2003-03-12 | Mitsubishi Pencil Co Ltd | Writing utensil |
| JP2005344003A (en) * | 2004-06-03 | 2005-12-15 | Satoshi Akaha | Drawing material developing color by coating color former |
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