JP4518629B2 - Writing instrument with excellent cap-off performance - Google Patents

Description

【００３７】
〔実施例１〜６及び比較例１〜４〕
（実施例１）
製造例１で得たコーティングインキ吸蔵体（中綿）を使用した図３に示す筆記具に上記表１の▲１▼のインキ（５ｇ）を充填し０℃で１日放置し、室温下に戻しキャップオフ後のノンドライ性を評価した。
（実施例２）
製造例２で得たコーティング中継芯を使用した図１に示す筆記具に上記表１の▲２▼のインキ（２ｇ）を充填し０℃で１日放置し、室温下に戻しキャップオフ後のノンドライ性を評価した。
（実施例３）
上記実施例１の筆記具において製造例３で得たペン先を使用して上記実施例１と同様にキャップオフ後のノンドライ性を評価した。
（実施例４）
上記実施例２の筆記具において製造例３で得たペン先を使用して上記実施例１と同様にキャップオフ後のノンドライ性を評価した。
（実施例５）
図２に示す筆記具２０のインキ内壁面部２２ａの全面にコーティング物質▲２▼を製造例１と同様の方法で処理した（処理率０．５％）。インキは、▲１▼のインキ（７ｇ）を充填し、０℃で１日放置し、室温下に戻しキャップオフ後のノンドライ性を評価した。
（実施例６）
上記実施例５の筆記具において、製造例３で得たペン先を使用して、上記実施例１と同様にキャップオフ後のノンドライ性を評価した。
【００３８】
（比較例１）
コーティング処理しないインキ吸蔵体（中綿）、ペン先を使用した図３に示す筆記具に上記表１の▲１▼のインキ（５ｇ）を充填し０℃で１日放置し、室温下に戻しキャップオフ後のノンドライ性を評価した。
（比較例２）
コーティング処理しない中継芯、ペン先を使用した図１に示す筆記具に上記表１の▲２▼のインキ（２ｇ）を充填し０℃で１日放置し、室温下に戻しキャップオフ後のノンドライ性を評価した。
（比較例３）
コーティング処理しないインキ吸蔵体（中綿）、ペン先を使用した図４に示す筆記具に上記表１の▲３▼のインキ（５．５ｇ）を充填し０℃で１日放置し、室温下に戻しキャップオフ後のノンドライ性を評価した。
（比較例４）
コーティング処理しないインキ吸蔵体（中綿）、ペン先を使用した図３に示す筆記具に上記表１の▲３▼のインキ（５ｇ）を充填し０℃で１日放置し、室温下に戻しキャップオフ後のノンドライ性を評価した。
上記実施例１〜６及び比較例１〜４で得られた筆記具のキャップオフ後のノンドライ性（キャップオフ後に掠れずに筆記できる日数）の結果を下記表２に示す。
【００３９】
【表２】

【００４０】
上記表２の結果から明らかなように、本発明となる実施例１のインキ吸蔵体に蒸発抑制作用を有する物質を夫々３種コーティングしてなる筆記具、実施例２の中継芯に蒸発抑制作用を有する物質を夫々３種コーティングしてなる筆記具、実施例３のインキ吸蔵体及びペン先に蒸発抑制作用を有する物質を夫々３種コーティングしてなる筆記具、実施例４の中継芯及びペン先に蒸発抑制作用を有する物質を夫々３種コーティングしてなる筆記具、実施例５のインキ内壁面部にコーティング物質を夫々３種コーティングしてなる筆記具、実施例６のインキ内壁面部及びペン先にコーティング物質を夫々３種コーティングしてなる筆記具は、蒸発抑制作用を有する物質をコーティングしていない比較例１〜４の筆記具に対して、キャップオフ後のノンドライ性にきわめて優れていることが判った。
殊に、比較例３及び４は、蒸発抑制作用を有する物質をインキ中に含有せしめたものであるが、蒸発抑制作用を有する物質の溶解性が悪く、キャップオフ性能が経時的に劣化してしまうことなどにより、キャップオフ後のノンドライ性も、実施例１〜６のコーティング物質をコーティングしてなる筆記具に較べ、劣ることが判った。
【００４１】
【発明の効果】
本発明によれば、長時間ペン先を大気中に放置しても良好な筆記性能及び優れたキャップオフ性能を発揮すると共に、経時的にも安定な品質を有する筆記具が提供される。
更に、ペン先に蒸発抑制作用を有する物質をコーティングする筆記具では、上記効果に更に長時間、良好なキャップオフ性能を実現する筆記具が提供される。
【図面の簡単な説明】
【図１】本発明の筆記具を直液式筆記具に適用した一例を断面態様で示す説明図である。
【図２】本発明の筆記具をバルブ機構を備えた筆記具に適用した一例を断面態様で示す説明図である。
【図３】本発明の筆記具をインキを中綿等のインキ吸蔵体に吸蔵させたタイプの一例を断面態様で示す説明図である。
【図４】本発明の筆記具をインキを中綿等のインキ吸蔵体に吸蔵させたタイプの他例を断面態様で示す説明図である。
【図５】本発明の筆記具をインキを中綿等のインキ吸蔵体に吸蔵させたタイプの他例を断面態様で示す説明図である。
【図６】（ａ）及び（ｂ）は、本発明の筆記具をノック式の筆記具に適用した使用状態の一例を断面態様で示す説明図である。
【図７】（ａ）〜（ｎ）は、本発明の筆記具に用いる繊維芯からなるペン先の構成を説明する説明図である。
【図８】（ａ）〜（ｊ）は、本発明の筆記具に用いるプラスチック芯からなるペン先の構成を説明する説明図である。
【図９】（ａ）及び（ｂ）は、実施例及び比較例で用いたインキ吸蔵体（中綿）の正面図及び横断面図である。
【図１０】実施例及び比較例で用いた中継芯の正面図である。
【符号の説明】
１０ 筆記具
１３ ペン先
１４ 中継芯[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a writing instrument excellent in cap-off performance that has good writing performance even when the nib is left in the atmosphere for a long period of time.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, writing instruments such as a marking pen, a sign pen, a brush pen, and the like that are written by penetrating ink into a pen tip made of a fiber core or a plastic core are widely used.
However, when the cap is removed and the nib portion is left in the atmosphere for a long time, there is a problem that the nib portion dries and writing failure occurs.
[0003]
Conventionally, as a writing instrument such as a marking pen, a ballpoint pen, a sign pen, and a brush pen that has excellent cap-off performance that suppresses drying at the nib, for example, a higher fatty acid ester of polyglycerin or the like is added to the ink (Japanese Patent Publication No. 62). No. 34345), paraffin wax that can be deposited on the pen tip surface to form a thin film is added to the ink (Japanese Patent Publication No. 1-35028), or hexaglyceryl tristearate is added to the ink. (Japanese Patent Laid-Open No. 2-232277), adding lecithin into the ink (Japanese Patent No. 2594457) is performed.
[0004]
However, many additives having a high evaporation inhibitory effect have low solubility in ink solvents (less than 10% by weight), and there is a problem in that the solubility is low. In particular, the solubility at 0 ° C. is even lower (5% by weight). % Or less), stored at low temperatures, or by precipitation at low and high temperatures, causing precipitation of the above additives in the ink, causing clogging in the ink flow path and reducing writability, and cap-off performance. However, it does not have an effective evaporation suppression effect yet.
[0005]
On the other hand, in Japanese Patent Application Laid-Open No. 7-242094, after the writing instrument is manufactured, the evaporation of the ink solvent from the writing part during the period until the first writing is effectively suppressed, and writing defects in the unused state occur. In order to prevent this from happening for a long time, one end of the writing core made of the porous core material was inserted into an ink occlusion body storing ink prepared by dissolving a dye in a solvent, and the other end was formed in the writing section. In the writing instrument, a method for preventing drying of the writing instrument is disclosed, wherein a high boiling point solvent such as benzyl alcohol having a low volatilization rate is previously applied or impregnated in the writing part of the writing core.
However, the method for preventing drying of a writing instrument disclosed in this publication is intended to prevent drying in the period from the manufacture of the writing instrument to the first writing, and is a benzyl alcohol having a slow volatilization rate among ink solvents. Therefore, it does not serve to prevent drying of the writing part after writing, and is different from the present invention in its purpose, action, and configuration (technical idea). In addition, benzyl alcohol used in the method for preventing drying of the writing instrument is a liquid at room temperature and is arbitrarily mixed with a solvent, and if left for a long period of time, it is taken into the ink occlusion body by the diffusion of the solution and has an effect. There is a problem in that it is almost lost, and benzyl alcohol and the like will flow out with a single writing, so the effect is not shown until the ink runs out.
[0006]
As described above, in writing instruments such as marking pens, sign pens, brush pens, etc. having a nib made of a conventional fiber core or plastic core, sufficient drying suppression at the nib has not yet been applied. Even now, no writing instrument with excellent cap-off performance has been provided.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned problems of the prior art, and is intended to solve this problem. In a writing instrument having a nib made of a fiber core or a plastic core, the cap-off is excellent in suppressing evaporation of the ink solvent from the nib. The object is to provide a writing instrument with excellent performance.
[0008]
[Means for Solving the Problems]
As a result of intensive studies on the above-mentioned problems of the prior art, the present inventor has realized a writing instrument with excellent cap-off performance in a writing pen such as a marking pen, a sign pen, and a writing pen having a nib made of a fiber core or a plastic core. In order to do this, by coating a substance having an evaporation suppressing action on the ink occlusion body, the relay core, the inner wall surface of the ink tank, the collector member, etc., which are used in these writing instruments, the parts that come into contact with ink, It was found that a writing instrument was obtained, and the present invention was completed.
That is, the writing instrument excellent in cap-off performance of the present invention exists in the following (1) to (6).
(1) It has an ink tank part that serves as a shaft for directly storing ink, and a collector member that temporarily stores ink, so that the ink can be drawn directly from the ink tank part to the pen tip or connected to the relay core. A writing instrument, wherein a substance having an evaporation inhibiting action is coated on at least one of the inner wall surface of the ink tank, the collector member, and the relay core.
(2) In a writing instrument having an ink tank part that serves as a shaft body for directly storing ink, and in which the ink is led out from the ink tank part to the pen tip directly or via a relay core, A writing instrument characterized in that the inner wall surface of the ink tank part and / or the relay core is coated with a substance having an evaporation inhibiting action.
(3) In a writing instrument having an ink occlusion body in which ink is occluded in a shaft body, and ink is led out from the ink occlusion body to a pen tip directly or via a relay core, the ink occlusion body and / or the relay core A writing instrument, wherein a substance having an evaporation inhibiting action is coated on the writing instrument.
(4) The pen tip according to any one of the above (1) to (3) is composed of a fiber core or a plastic core, and the pen tip is coated with a substance having an evaporation inhibiting action. Writing instrument to do.
(5) A substance having an evaporation inhibiting action is a glycerin derivative, an alkyl phosphate ester, a polyoxyethylene sorbitan fatty acid ester, a polyoxyethylene sorbit fatty acid ester, p-toluic acid, a pentaerythritol derivative, lecithin, paraffin wax, or microstalin wax. The writing instrument according to any one of the above (1) to (4), which is at least one selected from polyolefin waxes, and these substances have a solubility (25 ° C.) in an ink solvent of 5% or less. .
(6) The writing instrument according to any one of (1) to (5) above, wherein the coating amount of the substance having an evaporation inhibiting action is 0.01 to 20% by weight with respect to each coating material. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The writing instrument according to the first aspect of the present invention has an ink tank portion that serves as a shaft body that directly stores ink, and a collector member that temporarily stores ink, and ink from the ink tank portion to the pen tip. In a direct liquid writing instrument in which the derivation is performed directly or via a relay core, at least one of the inner wall surface of the ink tank part, the collector member, and the relay core is coated with a substance having an evaporation suppressing action. The writing instrument according to the second aspect of the invention has an ink tank portion that serves as a shaft body for directly storing ink, and the ink is led directly from the ink tank portion to the pen tip via the valve mechanism portion. Or, in a writing instrument performed through a relay core, the inner wall surface of the ink tank part and / or the relay core is coated with a substance having an evaporation inhibiting action. Further, the writing instrument according to the third aspect of the present invention has an ink occlusion body in which ink is occluded in the shaft body, and the ink lead-out from the ink occlusion body to the pen tip is directly or via a relay core. In the writing instrument to be performed, the ink occlusion body and / or the relay core is coated with a substance having an evaporation inhibiting action.
[0010]
As a specific structure of the writing instrument of the present invention, for example, the structure of a writing instrument having a writing instrument cap shown in FIGS. 1 to 5 and the structure of a knock-type writing instrument that eliminates the writing instrument cap shown in FIG. Is mentioned.
FIG. 1 is an example of an embodiment of a writing instrument according to the first invention, and the direct liquid writing instrument 10 has an ink tank portion 11 that serves as a shaft body that directly stores ink without being occluded by filling or the like. In the front part of the ink tank part 11, when the air in the ink tank part 11 expands due to a temperature rise or the like, the ink pushed out from the ink tank is temporarily stored so as not to drop from the pen tip or the air hole. The ink reservoir (collector member) 12 is built in, and the tip of the collector member 12 is provided with a pen tip 13 made of a fiber core.
Ink derivation from the ink tank unit 11 to the pen point 13 is performed by deriving ink from the ink tank unit 11 to the pen point 13 via the relay core 14 provided with the ink flow path 12 a attached to the central hole of the collector member 12. Is done.
In FIG. 1, 15 is a holder member, 16 is a rear shaft fixed to the rear portion of the ink tank portion 11, and 17 is a cap. Further, the ink may be led out by arranging the rear portion of the pen tip 13 directly in the ink tank portion 11 without the intermediary core 14 interposed.
In this writing instrument 10, at least one of the ink tank inner wall surface 11a, the collector member 12 and the relay core 14, that is, any one of them, or a combination of these two types, and all (total of 7 or more). Any one of the seeds) can be coated with a substance having an evaporation suppressing action described later, and in this embodiment, the relay core 14 made of fiber is coated with a substance having an evaporation suppressing action described later. .
[0011]
The writing instrument 20 of FIG. 2 is an example of an embodiment of the writing instrument according to the second invention, and is a valve-type writing instrument having a valve mechanism portion in which a hard ball 21 serving as a stirring ball is built.
The writing instrument 20 has an ink tank portion 22 that is a shaft body that directly stores ink without being occluded by a filling or the like, and the ink is supplied to a pen tip 24 that is made of a fiber core via a valve mechanism portion 23. It has become. 2 is a holder member, 26 is a holding member that is interposed between the valve mechanism portion 23 and the holder member 25 and holds the rear portion of the pen tip 24, and 27 is a cap.
In the writing instrument 20, a substance having an evaporation suppressing action described later is coated on the inner wall surface 22 a of the ink tank.
In this embodiment, ink is supplied to the pen tip without using a relay core. However, a relay core is provided, and is composed of a fiber core from the ink tank section 22 through the valve mechanism section 23 and the relay core. A configuration may be adopted in which ink is supplied to the nib 24. In this case, the ink tank portion inner wall surface 22a and / or the relay core can be coated with a substance having an evaporation suppressing action.
[0012]
3-6 is illustration of embodiment of the writing instrument used as 3rd invention, respectively.
3 and 4 are each a writing instrument in which ink is occluded in an ink occlusion body such as batting. Each of the writing tools 30a and 30b has ink occlusion bodies 32a and 32b in which ink is occluded in a fiber body such as batting in shaft main bodies 31a and 31b which are shaft bodies, and at the front part of the ink occlusion bodies 32a and 32b. Is configured such that the ink of the ink occlusion bodies 32a and 32b is supplied to the pen nibs 34a and 34b by contacting the rear ends 34a and 34b of the nibs 33a and 33b made of fiber cores. 35a and 35b are tail plugs fixed to the rear ends of the shaft bodies 31a and 31b, and 36a and 36b are caps. The difference between FIGS. 3 and 4 is that the shapes of the shaft bodies 31a and 31b and the pen nibs 33a and 33b and the structures of the tail plugs 35a and 35b are slightly different.
[0013]
FIG. 5 shows a sign pen type writing instrument in which ink is occluded in an ink occlusion body such as batting as in FIG. The writing instrument 40 has an ink occlusion body 42 in which ink is occluded in a fiber body such as batting in a shaft main body 41 serving as a shaft body, and a front end of the ink occlusion body 42 is behind a pen tip 43 made of a plastic core. The ink of the ink occlusion body 42 is supplied to the pen tip 43 by contacting the end 43a. 44 is a tail plug fixed to the rear end of the shaft body 41, 45 is a holder member, and 46 is a cap.
[0014]
FIG. 6 shows a knock-type writing instrument in which an ink occlusion body such as batting is occluded and a sign pen type cap is not required. The writing instrument 50 includes a refill-type inner shaft (core) 53 having an ink occlusion body 52 in which ink is occluded in a fiber body such as batting in a shaft body 51, and a fiber core is disposed at the front of the ink occlusion body 52. By contacting the rear end portion 54 a of the pen tip 54 made of the ink, the ink of the ink occlusion body 52 is supplied to the pen tip 54. Reference numeral 55 denotes a knock portion attached to the rear end portion of the shaft main body 51. By pushing the knock portion 55 forward, the pen tip 54 comes out of the shaft body 51 and enters a writing state, and the release button 55a is operated. Accordingly, the pen tip 54 is accommodated in the shaft body 51. Reference numeral 51a denotes a screwing portion for dividing the shaft main body 51. The inner shaft 53 can be easily replaced by unscrewing the screwing portion.
[0015]
In each of the writing tools 30a, 30b, 40, and 50 shown in FIGS. 3 to 6, the ink occlusion bodies 32a, 32b, 42, and 52 are coated with a substance having an evaporation suppressing action described later. In these embodiments, the ink is supplied to the pen tip without using a relay core, but each relay consisting of a fiber core or a plastic core is provided with a relay core provided from each ink occlusion body. The ink may be supplied to the pen tip, and in this case, the ink storage body and / or the relay core can be coated with a substance having an evaporation suppressing action.
[0016]
The nib, the relay core, the material, the structure, the manufacturing method, and the like of the nib made of the fiber core or the plastic core used in the writing instrument of the first to third inventions are not particularly limited. One or two animal hair fibers, polyacetal resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin, polyolefin resin, polyvinyl resin, polycarbonate resin, polyether resin, polyphenylene resin, etc. Ink grooves are formed in the axial direction of the fiber cores, relay cores or ink occlusion bodies obtained by processing fiber bundles such as parallel fiber bundles made of a combination of more than one kind, felt, or the like, or resin processing of these fiber bundles. There is a pen nib consisting of a plastic core, a porous body fused with the various plastic powders, etc. Is, its form is also plate-like member, the fiber collecting body, the sintered body is any such foam.
[0017]
Specific examples of the nib made of a fiber core to be used include those shown in FIGS. 7 (a) to (n). Moreover, as an aspect of the ink groove of the nib which consists of the plastic core of Fig.8 (a) which formed the ink groove in the axial direction of the said various plastic materials, it shows by FIG.8 (b)-(j), for example. The thing of a structure etc. are mentioned.
Preferably, when a fiber core is used as the nib or the relay core is preferably 30 to 75% in porosity and approximately 1 to 20 μm in slit diameter, and when a plastic core is used as the nib, The average slit diameter is preferably 20 to 40 μm.
The porosity and the slit diameter can vary depending on the writing instrument of each method, and are not limited to the above numerical range.
Furthermore, the slit diameter is calculated by the following formula.
Slit diameter = porosity x thread radius / (1-porosity)
[0018]
The substance having an evaporation inhibiting action used in the present invention is a substance capable of exhibiting drying inhibition of a nib composed of a fiber core or a plastic core, is solid at room temperature (25 ° C., the same applies hereinafter), and ink The solubility in a solvent is 5% or less at room temperature, preferably 1% or less. The lower limit of the solubility is preferably 0.01% or more, more preferably 0.1% or more.
Among the substances that exhibit drying inhibition of the nib, those that are liquid at room temperature or those that have a solubility in the ink solvent of more than 5% at room temperature will elute into the ink solvent due to dissolution and diffusion, resulting in a long period of time. The effect of the present invention cannot be achieved because the effect is reduced by the storage of the ink or the effect is lost as the ink is reduced by using a pen.
The solubility in the ink solvent is 5% or less at room temperature, and the solubility of the substance having an evaporation inhibiting action with respect to the ink solvent used in the present invention (a solvent composed of an organic solvent serving as an ink component described later). It means 5% or less at room temperature.
[0019]
Further, a substance having a preferable evaporation inhibitory action has the above-mentioned characteristics, and a melting point (mp) is 40 to 95 ° C., preferably 50 to 85 ° C. among substances imparting evaporation suppression of the nib. More preferably, the temperature is 60 to 75 ° C.
By using a substance having a melting point of 40 to 95 ° C. that has an evaporation inhibiting action, the storage at low temperature is further improved, and there is no clogging of ink occlusions such as filling and relay cores in the ink flow path. In addition, it is possible to demonstrate better writing performance, and since a substance having an inhibitory action of evaporation more than necessary does not dissolve in the ink, the drying time of the writing line when writing on a non-absorbing surface such as glass is accelerated. It will be.
[0020]
The substance having an evaporation inhibiting action used in the present invention is required to have the above characteristics, that is, a property that is solid at room temperature, and a property that the solubility in an ink solvent is 5% or less at room temperature, and more preferably. Those having a characteristic that the melting point is 40 to 95 ° C. are desirable, for example, diglycerin monostearate, triglyceryl monostearate, pentaglyceryl tristearate, hexaglyceryl tristearate, decaglycerin distearate having the above characteristics Such as glycerin derivatives, alkyl phosphate esters such as polyoxyethylene stearyl phosphate, polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan tristearate, polyoxyethylene Polyoxyethylene sorbite fatty acid esters such as sorbit hexastearate, pentaerythritol derivatives such as pentaerythritol monostearate, pentaerythritol distearate, paraffin waxes such as lecithin, normal paraffin wax, isoparaffin wax, microcrystalline wax, polyolefin wax, etc. 1 type, or 2 or more types of mixtures selected from these are mentioned.
Particularly preferably, it is solid at normal temperature, has a melting point of 40 to 95 ° C., has a solubility in ink solvent of 5% or less at normal temperature, and further imparts drying suppression performance due to physical friction or ink outflow to the pen tip by writing. From the aspect of making it difficult for the substances to be released, the harder properties and lower solubility improve the durability and effect, so hexaglyceryl tristearate, polyoxyethylene sorbitan tristearate, paraffin wax, micro Crystalline wax and polyolefin wax are preferred.
Specific examples of the substances having the above-mentioned properties having various evaporation inhibiting effects are exemplified as described above (from diglycerin monostearate to polyolefin wax), but in these various substances, the melting point is more preferably selected from these. Those whose (mp) falls within the range of 40 to 95 ° C. are selected.
[0021]
In the present invention, each writing instrument shown in FIGS. 1 to 6 is made of a substance having the above-described characteristics that imparts a pen tip drying inhibiting action to at least one of the ink tank inner wall surface, the collector member, the relay core, and the ink occlusion body. As a coating method, for example, a substance having the above characteristics is dissolved in a solvent, and the ink tank part inner wall surface, the surface part of the collector member, the relay core, and the ink occlusion body are dipped or sprayed, and then heated. Or it can carry out by making it dry at room temperature. When the solubility is extremely low, it can be dipped in a warm solution and coated by cooling.
These coating methods are excellent as simple and inexpensive methods.
Examples of the solvent that dissolves the substance having the above characteristics include alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, and isopropyl alcohol (i-propyl alcohol), ethylene glycol monomethyl ether, and ethylene glycol monoethyl ether. , Glycols such as propylene glycol monomethyl ether, ketones such as acetone and methyl ethyl ketone, esters such as methyl acetate, ethyl acetate, butyl acetate, ethylene glycol monomethyl ether acetate and propylene glycol monoethyl ether acetate, dimethyl ether and diethyl ether Ethers, hexane, isohexane, heptane, methylcyclohexane and other hydrocarbons, chloroform, methylenechlora Such as chlorine compounds such as de the like.
[0022]
The coating amount of the material having the above characteristics on the coating material (any one of the inner wall surface of the ink tank, the surface portion of the collector member, the relay core and the ink occlusion body) is 0 by weight with respect to each coating material. 0.01 to 20% by weight, preferably 0.1 to 10% by weight, and more preferably 0.3 to 5% by weight.
When the coating amount is less than 0.01% by weight, the effect of the present invention cannot be achieved. When the coating amount exceeds 20% by weight, a substance having an evaporation inhibiting action is excessively attached to each coating material. The functions that each coating material should originally perform are impaired, for example, ink becomes difficult to come out, and the ink tip becomes broken as the writing progresses. It is not preferable, such as disappearing.
[0023]
In the present invention, examples of the ink component filled in the core include a colorant, a solvent, a resin soluble in the solvent, and other additives for writing instruments.
Examples of the colorant include oil-soluble dyes and pigments. As the oil-soluble dye, almost any oil-soluble dye that is soluble in an organic solvent can be used.
For example, as dyes, Orazo Yellow 2GLN, Orazo Red 3GL, Orazo Blue 2GLN, Neon Zapon Blue FLE, Spirit Black SP, Paris Fast Red 1308, Oil Blue BA, Oil Yellow 185, Oil Red TR71, Oil Black S, Victoria Blue, Rhodamine 6JHSA, Flex Yellow 105 and the like, and the pigment is not particularly limited. For example, azo pigment, condensed polyazo pigment, phthalocyanine pigment, metal complex pigment, thioindigo pigment, dye lake Examples include pigments, organic pigments such as fluorescent pigments, and inorganic pigments such as carbon black and titanium oxide. Further, processed pigments whose surfaces are processed with a resin coating, such as various types of microlith A type, AS black, AS blue, and IK red. Etc. can also be used. These dyes and / or pigments can be used alone or in admixture of two or more, and the amount used varies depending on the type of colorant and other ink components, but is 1-30 wt. %, Preferably 2 to 15% by weight.
[0024]
Examples of the solvent that can be used include lower alcohols such as ethyl alcohol, propyl alcohol, isopropyl alcohol, aromatic hydrocarbons such as toluene and xylene, and lower aliphatics such as methyl ethyl ketone and methyl isobutyl ketone. Lower alcohol esters of lower fatty acids such as ketones, ethyl acetate and butyl acetate, fatty acid hydrocarbons such as hexane and heptane, alicyclic hydrocarbons such as cyclohexane and ethylcyclohexane, alkyl alcohols of glycol, propylene glycol monomethyl ether, etc. Glycol ethers of
Solvents having these characteristics can be used alone or in admixture of two or more, and the amount used is 50 to 90% by weight, preferably 70 to 85% by weight based on the total amount of ink. % Is desirable.
[0025]
The resin is used as a film-forming agent, an adhesive to the coated surface, an ink viscosity modifier, and a colorant dispersant. Various conventional and synthetic resins are used. For example, rosin resins such as rosin, ester gum, maleic acid modified rosin and phenol modified rosin, cellulose resins such as ethyl cellulose and nitrocellulose, vinyl resins such as polyvinyl butyral and vinyl chloride-vinyl acetate copolymer resin , Petroleum resin, ketone resin, acrylic resin, aldehyde and urea condensate, maleic acid resin, etc., and these can be used alone or in combination of two or more, and the amount used is , 0.1 to 30% by weight, preferably 1 to 20% by weight, based on the total amount of ink.
Examples of other writing instrument additives include anionic, nonionic and cationic surfactants, preservatives, antifungal agents, rust preventives, lubricants, pH adjusters, and the like.
[0026]
In the writing instrument according to each invention configured as described above, the substance having the above-described evaporation suppressing action that exerts the drying-inhibiting action of the nib on at least one of the ink tank portion inner wall surface, the collector member, the relay core, and the ink occlusion body, That is, each coating material (ink tank inner wall surface, collector member, relay core and ink) is coated by coating the above-described substance having an evaporation inhibiting action that is solid at room temperature and has a solubility in an ink solvent of 5% or less at room temperature. At least one of the occlusion material) gradually dissolves in the ink, and when the substance having an evaporation inhibiting action that has dissolved in the ink goes to the surface of the pen tip, a very brittle film is formed on the surface of the pen tip. This film prevents evaporation of the solvent that becomes a volatile component contained in the ink component, and the film is applied by the writing pressure at the time of writing. In addition, although the formation of the coating film is slightly different depending on the coating amount, each coating material (ink tank inner wall surface, collector member, relay core, and ink occlusion body) ) When the substance having the evaporation inhibiting action is dissolved again in the ink by the required amount again, and then the pen tip is exposed to the air, a new film is formed on the pen tip surface by interaction with the ink solvent, This film formation → writing → film formation → writing …… shows the effect repeatedly. This effect is repeated until the ink components filled in the ink tank portion or stored in the ink storage body are used up.
In addition, since it is completely different from the conventional ink composition in which a substance having a low solubility in the ink and having an evaporation inhibitory action is directly contained in the ink, the substance having an evaporation inhibitory action is added to the ink from each coating material. Since it gradually dissolves, it will have good storage stability at low temperatures, will not clog in the ink flow path, and will provide a writing instrument that has stable quality over time. .
[0027]
In this invention, even if it is a writing instrument of each form of FIGS. 1-6, the writing instrument which is excellent in the evaporation suppression of the ink solvent from a nib, ie, the writing instrument which is excellent in cap-off performance, will be provided.
In particular, in the knock-type writing instrument shown in FIG. 6 that has no cap body, even if it has a structure that does not seal the nib, it achieves good writing performance, and has an evaporation inhibiting action with low solubility in ink. Since the substance that does not contain the substance directly is coated on each coating material (at least one of the ink tank inner wall surface, collector member, relay core, and ink occlusion body), the coating material is thereby coated. Therefore, the ink is gradually dissolved in the ink, so that the storage stability at a low temperature is good, and clogging does not occur in the ink flow path.
Further, in a writing instrument in which each coating material is coated with each of the above-mentioned substances having an evaporation inhibiting action, which is solid at normal temperature, has a melting point of 40 to 95 ° C., and has a solubility in an ink solvent of 5% or less at normal temperature. Furthermore, since a substance that imparts an unnecessary evaporation inhibiting action does not dissolve in the ink, the drying time of the writing line when writing on a non-absorbing surface such as glass is shortened.
[0028]
In the present invention, more preferably, the above-mentioned substance having an evaporation inhibiting action is coated on each coating material (at least one of the ink tank portion inner wall surface, the collector member, the relay core, and the ink occlusion body) as described above. It is desirable to coat the material having the above-described characteristics and having an evaporation inhibiting action on each pen tip of each writing instrument shown in FIGS. 1 to 6 by a coating method such as the above-described dipping treatment or spraying treatment.
In addition, the substance which has an evaporation inhibitory effect can use the thing of the fundamentally same characteristic as the above-mentioned coating substance.
[0029]
The coating amount on the pen tip of the substance having the above-mentioned properties having an evaporation inhibiting action is 0.01 to 20% by weight, preferably 0.1 to 10% by weight, more preferably, with respect to the pen tip. 0.3 to 5% by weight.
If the coating amount is less than 0.01% by weight, the effects of the present invention cannot be achieved. If the coating amount exceeds 20% by weight, the ink flow path of the pen tip and the strength (durability) of the pen tip This is not preferable because the balance becomes unbalanced, ink becomes difficult to come out, and blurring occurs, or the pen tip collapses as writing progresses.
[0030]
In the writing instrument of this form, the pen tip is coated with a substance having an evaporation inhibiting action, and further, each coating material is coated with a substance having an evaporation inhibiting action, so that the effects of the present invention can be further improved. Will be able to.
Particularly preferably, the coating amount of the substance having the evaporation inhibiting action on the pen tip is 0.3 to 5% by weight with respect to the pen tip, and the coating material of the substance having the evaporation inhibiting action is applied to each coating material. When the coating amount is 0.02 to 10% by weight with respect to each coating material, the effect of the present invention can be further improved.
[0031]
Needless to say, the writing instrument of the present invention is not limited to the above embodiment, and can be changed to various forms without departing from the scope of the present invention. For example, the present invention can be applied to applicators such as cosmetics.
In particular, in the present invention, as shown in FIG. 6, a writing instrument that achieves good writing performance can be achieved even when the pen tip is accommodated in the writing instrument main body without the cap body. It can be suitably used for a writing instrument having a structure such as a knock type refill marking pen, a sign pen, a brush pen and the like that does not require a cap.
[0032]
【Example】
EXAMPLES Next, although this invention is demonstrated in detail based on an Example and a comparative example, this invention is not limited to the following Example.
[0033]
[Production Example 1, production of coating ink occlusion body (batting)]
As the ink occlusion body, the ink occlusion bodies shown in FIGS. 9A and 9B were used.
The ink occlusion body was made of polypropylene fiber sliver, and used was 2.0 g in weight, 70 mm in length, and 13 mm in diameter (porosity 80%).
(1) Hexaglyceryl tristearate (melting point 57 ° C), (2) Paraffin wax (melting point 61 ° C, “Paraffin wax 140” manufactured by Nippon Seiwa Co., Ltd.), (3) Polyoxyethylene sorbitan mono Three kinds of stearates (melting point 53 ° C.) were used.
The solubility of the above (1) to (3) in the ink solvent [solvent consisting of n-propyl alcohol and propylene glycol monomethyl ether] is room temperature, (1) is 2%, (2) is 0.1%, and (3). ▼ was 0.6%.
In the coating method, the above-mentioned predetermined amount of the coating substance is dissolved in isohexane as a solvent, the ink occluding material is immersed in the prepared liquid, immersed at 50 ° C. for 2 hours, and then pulled up to a mesh-like container. Was dried at 50 ° C. for a whole day and night (24 hours).
The amount of the coating substance (agent) attached to the ink occlusion body (filling) was taken as the weight difference between the ink occlusion bodies before and after the treatment, and was expressed in weight% with respect to the weight of the ink occlusion body before the treatment. In Production Example 1, 5% was used for all three treatment rates.
[0034]
The relay core shown in FIG. 10 was used as the relay core.
The relay core is made of an acrylic fiber sliver, and has a weight of 0.05 g, a length of 22 mm, and a diameter of 1.5 mm (porosity of 50%).
As the coating substance (agent), (1) to (3) of Production Example 1 were used, and the coating method was also produced in the same manner as in Production Example 1.
In addition, the coating amount used the relay core of 1% of all 3 types with the said processing rate similarly to manufacture example 1.
[0035]
[Production Example 3, preparation of coating pen tip]
The pen tip shown in FIG. 7A was used as the pen tip.
The nib was made of an acrylic fiber sliver, and had a weight of 0.17 g, a length of 33 mm, and a diameter of 4.0 mm (porosity 55%).
As the coating substance (agent), (1) to (3) of Production Example 1 were used, and the coating method was also produced in the same manner as in Production Example 1.
As in the case of Production Example 1, the coating amount used was a pen tip (pen nib) of 1% for all three types.
In addition, inks (1) to (3) having the compositions shown in Table 1 below were used.
[0036]
[Table 1]

[0037]
[Examples 1 to 6 and Comparative Examples 1 to 4]
Example 1
The writing instrument shown in FIG. 3 using the coating ink occlusion body (filling) obtained in Production Example 1 is filled with the ink (5 g) of (1) in Table 1 above, left at 0 ° C. for 1 day, returned to room temperature and returned to the cap. The non-dry property after turning off was evaluated.
(Example 2)
The writing instrument shown in FIG. 1 using the coated relay core obtained in Production Example 2 is filled with the ink (2 g) of (2) in Table 1 above, left at 0 ° C. for 1 day, returned to room temperature, and non-dried after cap-off. Sex was evaluated.
(Example 3)
In the writing instrument of Example 1 above, the non-dry property after cap-off was evaluated in the same manner as in Example 1 above using the nib obtained in Production Example 3.
Example 4
Using the nib obtained in Production Example 3 in the writing instrument of Example 2, the non-dry property after cap-off was evaluated in the same manner as in Example 1.
(Example 5)
The coating material (2) was treated on the entire surface of the ink inner wall surface portion 22a of the writing instrument 20 shown in FIG. 2 in the same manner as in Production Example 1 (treatment rate 0.5%). The ink was filled with the ink (1) (7 g), left at 0 ° C. for 1 day, returned to room temperature, and evaluated for non-dry property after cap-off.
(Example 6)
In the writing instrument of Example 5, the non-dry property after cap-off was evaluated in the same manner as in Example 1 above, using the nib obtained in Production Example 3.
[0038]
(Comparative Example 1)
Fill the writing instrument shown in Fig. 3 using an ink occlusion body (filling) and a nib without coating treatment with the ink (5g) of (1) in Table 1 above, leave it at 0 ° C for 1 day, return it to room temperature and cap off. The later non-dry property was evaluated.
(Comparative Example 2)
Fill the writing instrument shown in Fig. 1 using relay core and nib without coating with ink (2g) of (2) in Table 1 above, let stand at 0 ° C for 1 day, return to room temperature for 1 day, non-drying after cap-off Evaluated.
(Comparative Example 3)
The writing instrument shown in FIG. 4 using an ink occlusion body (batting) that is not coated and a nib is filled with the ink (5.5 g) in Table 1 above and left at 0 ° C. for 1 day, and then returned to room temperature. The non-dry property after cap-off was evaluated.
(Comparative Example 4)
Fill the writing instrument shown in Fig. 3 using an ink occlusion body (filling) and a nib without coating treatment with the ink (5g) in Table 3 above, leave it at 0 ° C for 1 day, return to room temperature and cap off. The later non-dry property was evaluated.
Table 2 below shows the results of the non-dry property (number of days that can be written without squeezing after cap-off) of the writing instruments obtained in Examples 1 to 6 and Comparative Examples 1 to 4 after cap-off.
[0039]
[Table 2]

[0040]
As is apparent from the results of Table 2 above, the writing occluder obtained by coating the ink occluding body of Example 1 according to the present invention with three substances each having an evaporation inhibiting action, and the relay core of Example 2 having an evaporation inhibiting action. A writing instrument formed by coating three kinds of substances each having the above, a writing instrument formed by coating three kinds of substances each having an evaporation inhibiting action on the ink occlusion body and the pen tip of Example 3, and the relay core and the pen point of Example 4 evaporating. A writing instrument formed by coating three types of substances each having an inhibitory action, a writing instrument formed by coating three types of coating substances on the ink inner wall surface of Example 5, and a coating substance on the inner wall surface of ink and the pen tip of Example 6, respectively. The writing instrument with three types of coating is different from the writing instrument of Comparative Examples 1 to 4 that is not coated with a substance having an evaporation inhibiting action, after the cap-off. It was found to be excellent in dry properties.
In particular, Comparative Examples 3 and 4 contain a substance having an evaporation inhibiting action in the ink, but the solubility of the substance having the evaporation inhibiting action is poor and the cap-off performance deteriorates with time. As a result, it was found that the non-dry property after cap-off was inferior to that of the writing instrument obtained by coating the coating materials of Examples 1 to 6.
[0041]
【The invention's effect】
According to the present invention, there is provided a writing instrument that exhibits good writing performance and excellent cap-off performance even when the nib is left in the atmosphere for a long time, and has stable quality over time.
Furthermore, a writing instrument that coats a substance having an evaporation inhibiting action on the pen tip provides a writing instrument that realizes a good cap-off performance for a longer time than the above effect.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing, in a cross-sectional form, an example in which the writing instrument of the present invention is applied to a direct liquid writing instrument.
FIG. 2 is an explanatory view showing an example in which the writing instrument of the present invention is applied to a writing instrument having a valve mechanism in a cross-sectional form.
FIG. 3 is an explanatory view showing, in cross-sectional form, an example of the type in which the writing instrument of the present invention is occluded in an ink occlusion body such as batting.
FIG. 4 is an explanatory view showing, in cross-sectional form, another example of the type in which the writing instrument of the present invention is occluded in an ink occlusion body such as batting.
FIG. 5 is an explanatory view showing, in cross-sectional form, another example of the type in which the writing instrument of the present invention is occluded in an ink occlusion body such as batting.
FIGS. 6A and 6B are explanatory views showing an example of a usage state in which the writing instrument of the present invention is applied to a knock-type writing instrument in a cross-sectional form.
FIGS. 7A to 7N are explanatory views for explaining a configuration of a nib made of a fiber core used in the writing instrument of the present invention. FIGS.
FIGS. 8A to 8J are explanatory views illustrating the configuration of a pen tip made of a plastic core used in the writing instrument of the present invention.
FIGS. 9A and 9B are a front view and a cross-sectional view of an ink storage body (filling) used in Examples and Comparative Examples.
FIG. 10 is a front view of a relay core used in Examples and Comparative Examples.
[Explanation of symbols]
10 Writing instruments
13 nib
14 Relay core

Claims (6)

In addition to having an ink tank part that serves as a shaft body that directly stores ink, it also has a collector member that temporarily stores ink, and the ink is led from the ink tank part to the pen tip directly or via a relay core. In the writing instrument, at least one of the inner wall surface of the ink tank, the collector member, and the relay core is coated with a substance having an evaporation inhibiting action with a solubility (25 ° C.) in an ink solvent selected from the following group A of 5% or less. Writing instrument characterized by having.
Group A: ethyl alcohol, propyl alcohol, isopropyl alcohol, toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, butyl acetate, hexane, heptane, cyclohexane, ethylcyclohexane, propylene glycol monomethyl ether In a writing instrument having an ink tank part that serves as a shaft body for directly storing ink and in which the ink is led out from the ink tank part to the pen tip directly or via a relay core, A writing instrument, wherein a wall surface and / or a relay core is coated with a substance having an evaporation inhibiting action having a solubility (25 ° C.) in an ink solvent selected from the following group A of 5% or less .
Group A: ethyl alcohol, propyl alcohol, isopropyl alcohol, toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, butyl acetate, hexane, heptane, cyclohexane, ethyl cyclohexane, propylene glycol monomethyl ether In a writing instrument having an ink occlusion body in which ink is occluded in the shaft body, and the ink derivation from the ink occlusion body to the pen tip is performed directly or via a relay core, the ink occlusion body and / or the relay core includes the following : A writing instrument, which is coated with a substance having an evaporation-inhibiting action and having a solubility (25 ° C.) in an ink solvent selected from Group A of 5% or less .
Group A: ethyl alcohol, propyl alcohol, isopropyl alcohol, toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, butyl acetate, hexane, heptane, cyclohexane, ethyl cyclohexane, propylene glycol monomethyl ether Writing instrument nib according to any one of claims 1 to 3 is a fiber core or plastic core, to the pen tip, the material having the evaporation inhibiting action is characterized in that it is coated. The substance having an evaporation inhibiting action is a glycerin derivative, an alkyl phosphate ester, a polyoxyethylene sorbitan fatty acid ester, a polyoxyethylene sorbit fatty acid ester, p-toluic acid, a pentaerythritol derivative, lecithin, paraffin wax, microstalline wax, polyolefin At least Tanedea Ru writing instrument according to any one of claims 1 to 4 which is selected from waxes. To the coating weight of the each of the coating material of the substance having the evaporation inhibiting effect, by weight, writing instrument according to any one of claims 1 to 5, 0.01 to 20 wt%.

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