JPH11116872A - Recording liquid - Google Patents
Recording liquidInfo
- Publication number
- JPH11116872A JPH11116872A JP28674097A JP28674097A JPH11116872A JP H11116872 A JPH11116872 A JP H11116872A JP 28674097 A JP28674097 A JP 28674097A JP 28674097 A JP28674097 A JP 28674097A JP H11116872 A JPH11116872 A JP H11116872A
- Authority
- JP
- Japan
- Prior art keywords
- recording liquid
- water
- pigment
- liquid
- recording
- 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
Landscapes
- Ink Jet (AREA)
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、インクジェット記
録に使用される記録液に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording liquid used for ink jet recording.
【０００２】[0002]
【従来の技術】インクジェット記録は、低騒音で高速印
字が可能な記録方法であり、最近急速に普及しつつある
記録方法である。このようなインクジェット記録は、記
録液を加熱あるいは加圧といった方法により小液滴とし
て吐出させ、それを紙等の被記録材に付着させて記録を
行うものである。2. Description of the Related Art Ink jet recording is a recording method capable of high-speed printing with low noise, and is a recording method that has been rapidly spreading recently. In such ink jet recording, recording is performed by discharging a recording liquid as small droplets by a method such as heating or pressurization and attaching the recording liquid to a recording material such as paper.
【０００３】記録液の色材としては、これまで、染料が
使用されていた。しかし記録物の耐水・耐候性の面から
考えると、染料よりも顔料を用いる方が有利である。ま
た、液媒体としては、普通紙上への滲みの面から考える
と、非水性液媒体よりも水性液媒体を用いる方が有利で
ある。[0003] Dyes have been used as coloring materials for recording liquids. However, from the viewpoint of water resistance and weather resistance of the recorded matter, it is more advantageous to use a pigment than a dye. As the liquid medium, an aqueous liquid medium is more advantageous than a non-aqueous liquid medium from the viewpoint of bleeding on plain paper.
【０００４】そこで、記録液の色材に顔料を用い、この
顔料を水性液媒体に分散した水性顔料系記録液の開発が
行われている。Therefore, an aqueous pigment-based recording liquid in which a pigment is used as a coloring material of the recording liquid and the pigment is dispersed in an aqueous liquid medium has been developed.
【０００５】[0005]
【発明が解決しようとする課題】インクジェット記録に
用いられる記録液は低湿度環境下での印字、並びに非常
時、すなわちヘッドが長時間大気下に曝された場合、ノ
ズル穴から記録液中の水分、揮発性添加物が蒸発する。The recording liquid used for ink-jet recording is used for printing under a low humidity environment, and in the case of an emergency, that is, when the head is exposed to the atmosphere for a long period of time, the water in the recording liquid passes through the nozzle hole. , The volatile additives evaporate.
【０００６】それに伴う記録液の粘度上昇は水性顔料系
記録液と水性染料系記録液ともに生じるが、水性顔料系
記録液は水性染料系記録液に比べ顔料の凝集に起因する
目詰まり等の問題が生じ易い事があげられる。[0006] The viscosity increase of the recording liquid accompanying this occurs in both the aqueous pigment-based recording liquid and the aqueous dye-based recording liquid, but the aqueous pigment-based recording liquid is more problematic than the aqueous dye-based recording liquid in terms of clogging and the like due to aggregation of the pigment. Is easy to occur.
【０００７】ノズル穴からの水分の蒸発は印字中におい
ては不使用ノズルで生じる。この際は空吐出などの回復
動作で不使用ノズル、すなわちある一定時間大気放置さ
れたノズルのメニスカスを形成する表層部の増粘記録液
を除去する。更に長期間ノズルが大気にさらされた場合
は、記録液から更に水分、揮発性添加物が蒸発する事か
ら吸引やワイピング等により増粘記録液を除去する回復
動作が行われる。[0007] Evaporation of water from the nozzle holes occurs at unused nozzles during printing. At this time, the thickened recording liquid on the surface layer forming the meniscus of the unused nozzles, that is, the nozzles that have been left in the air for a certain period of time is removed by a recovery operation such as idle discharge. If the nozzle is exposed to the atmosphere for a longer period of time, a recovery operation for removing the thickened recording liquid by suction, wiping, or the like is performed because the water and volatile additives further evaporate from the recording liquid.
【０００８】回復動作が行われる場合は記録液中の水
分、揮発性添加物が蒸発した増粘記録液が短期的には空
吐出、長期的には吸引動作により容易に除去できる程度
の粘度と流動性を有することが必要となる。更に上記増
粘記録液が記録液と容易に混合されることも必要条件と
なる。それらを満たす記録液としては増粘記録液の顔料
凝集が無く、また記録液から水分、揮発性添加物が蒸発
した後も記録液への再分散性に優れていることが求めら
れる。When a recovery operation is performed, the viscosity of the thickened recording liquid obtained by evaporating the water and volatile additives in the recording liquid has a viscosity such that it can be easily removed by an empty discharge in the short term and a suction operation in the long term. It is necessary to have fluidity. Further, it is a necessary condition that the above-mentioned thickened recording liquid is easily mixed with the recording liquid. It is required that the recording liquid that satisfies these conditions has no pigment aggregation of the thickened recording liquid, and has excellent re-dispersibility in the recording liquid even after moisture and volatile additives evaporate from the recording liquid.
【０００９】そこで、本発明の目的は耐目詰まり性に優
れた水性顔料系記録液を提供することである。Accordingly, an object of the present invention is to provide an aqueous pigment-based recording liquid having excellent clogging resistance.
【００１０】[0010]
【課題を解決するための手段】本発明の記録液は少なく
とも分散剤、水溶性液媒体、保湿剤、顔料、水から構成
される水性顔料系記録液であって、かかる記録液がノズ
ル穴表面でメニスカスを形成し、大気暴露された際、記
録液中の水分が蒸発する事で相分離を生じ、かかる相分
離後のメニスカスを形成する表層が保湿剤濃度の高い透
明相であって耐目詰まり性に優れている事を特徴とする
ものである。The recording liquid of the present invention is an aqueous pigment-based recording liquid comprising at least a dispersant, a water-soluble liquid medium, a humectant, a pigment, and water. When exposed to air, the water in the recording liquid evaporates to cause phase separation, and the surface layer forming the meniscus after such phase separation is a transparent phase with a high humectant concentration and It is characterized by being excellent in clogging.
【００１１】なお、本発明の記録液の相分離現象はイン
クジェットプリンタのノズル穴、あるいは直径が数ｍｍ
未満の毛細管等の微小な径からの水分蒸発により生じる
現象である事を我々は見いだした。Incidentally, the phase separation phenomenon of the recording liquid of the present invention is caused by a nozzle hole or a diameter of several mm of an ink jet printer.
We have found that this phenomenon is caused by the evaporation of water from a small diameter such as a capillary tube.
【００１２】記録液の分散剤は顔料を５０ｎｍから２０
０ｎｍの範囲で安定に分散する水溶性樹脂、界面活性剤
であり親水部としてカルボン酸塩基、スルホン酸塩基、
リン酸塩基等の陰イオン性基やポリオキシアルキレン基
等のノニオン性置換基を有するものがあげられる。更
に、かかる分散剤の分子量は分散させる顔料の種類にも
よるが、分子量が数百から数万のものを用いることが出
来る。The dispersant of the recording liquid is such that the pigment is 50 nm to 20 nm.
A water-soluble resin stably dispersed in the range of 0 nm, a carboxylic acid group as a surfactant and a hydrophilic group, a sulfonic acid group,
Those having an anionic group such as a phosphate group or a nonionic substituent such as a polyoxyalkylene group are exemplified. Further, the molecular weight of such a dispersant depends on the kind of the pigment to be dispersed, but one having a molecular weight of hundreds to tens of thousands can be used.
【００１３】記録液の水溶性液媒体としては陰イオン性
分散剤の対イオン種のひとつとしてジエタノールアミ
ン、トリエタノールアミン等の各種アルカロールアミン
等が用いられる。そのほかの水溶性液媒体として記録液
の紙面への浸透性付与剤、ｐＨ調整剤、表面張力調整
剤、粘度調整剤等を必要に応じて添加する。As a water-soluble liquid medium of the recording liquid, various alkalolamines such as diethanolamine and triethanolamine are used as one of counterion species of the anionic dispersant. As other water-soluble liquid media, a recording liquid penetrating agent to the paper surface, a pH adjuster, a surface tension adjuster, a viscosity adjuster, and the like are added as necessary.
【００１４】なお、分散剤の対イオン種としてはアルカ
ロールアミンのほかにナトリウム、カリウム等のアルカ
リ金属類、アンモニアなどを用いることができる。As the counter ion species of the dispersant, alkali metals such as sodium and potassium, ammonia and the like can be used in addition to alkalolamine.
【００１５】記録液の保湿剤としてはグリセリンのほか
に、エチレングリコール、ポリエチレングリコール等の
エチレングリコール類、プロピレングリコール、ポリプ
ロピレングリコール等のポリプロピレングリコール類や
１，３−ブタンジオール、１，３−プロパンジオール等
のジオール類、あるいはピロリドン等を用いることがで
きる。As a humectant for the recording liquid, in addition to glycerin, ethylene glycols such as ethylene glycol and polyethylene glycol, polypropylene glycols such as propylene glycol and polypropylene glycol, 1,3-butanediol and 1,3-propanediol And the like, or pyrrolidone and the like.
【００１６】その際、保湿剤組成は分散系の安定性、水
分蒸発後の乾燥インクの粘度を考慮に入れ、単一種では
なく複数種の保湿剤を混合した混合保湿剤系とすること
が好ましい。At this time, the composition of the humectant is preferably a mixture of a plurality of humectants instead of a single humectant, taking into account the stability of the dispersion system and the viscosity of the dried ink after water evaporation. .
【００１７】記録液に用いる顔料は要求される色調、分
散剤との適合性など調べた上で種々の顔料を用いること
ができる。黒顔料の代表的なものはカーボンブラック、
青系顔料としてはフタロシアニン顔料、赤系顔料として
はキナクリドン顔料、黄系顔料としてはアゾ顔料などを
用いることができる。As the pigment used in the recording liquid, various pigments can be used after examining the required color tone, compatibility with a dispersant, and the like. Typical black pigments are carbon black,
A phthalocyanine pigment can be used as a blue pigment, a quinacridone pigment can be used as a red pigment, and an azo pigment can be used as a yellow pigment.
【００１８】[0018]
【発明の実施の形態】分散剤、水溶性液媒体、保湿剤、
水を混合溶解し分散媒とする。かかる分散媒と顔料を混
合分散し記録液を調整する。BEST MODE FOR CARRYING OUT THE INVENTION A dispersant, a water-soluble liquid medium, a humectant,
Water is mixed and dissolved to form a dispersion medium. The dispersion liquid and the pigment are mixed and dispersed to prepare a recording liquid.
【００１９】その際、水溶性液媒体の一部、保湿剤の一
部、水の一部を混合溶解した分散媒を用いた場合は記録
液原液が得られ、分散後残りの水溶性媒体、保湿剤、水
を記録液原液に添加し記録液とする。In this case, when a dispersion medium obtained by mixing and dissolving a part of a water-soluble liquid medium, a part of a humectant, and a part of water is used, a stock solution of a recording liquid is obtained. A humectant and water are added to the undiluted recording solution to make a recording solution.
【００２０】かかる分散媒と顔料の混合分散にはサンド
ミル、ボールミル、超音波ホモジナイザー、高圧ホモジ
ナイザー、ジェットミル等の粉砕分散機が用いられる。For mixing and dispersing the dispersion medium and the pigment, a pulverizer / disperser such as a sand mill, a ball mill, an ultrasonic homogenizer, a high-pressure homogenizer and a jet mill is used.
【００２１】次に上記操作により調製した記録液内の粗
大粒子、並びに非記録液成分を遠心分離、濾過処理によ
り除き記録液を精製する。Next, the recording liquid is purified by removing the coarse particles and the non-recording liquid components in the recording liquid prepared by the above operation by centrifugation and filtration.
【００２２】得られた記録液について以下の試験を行
う。The following test is performed on the obtained recording liquid.
【００２３】相分離確認試験；蓋に毛細管差込口と空気
孔をもうけたサンプル瓶に、ある一定量の記録液を満た
し、毛細管の高さを調整して毛細管表面にメニスカスを
形 成する。用いる毛細管は直径１ｍｍ以下のものが好
ましい。作製したサンプルを気温２５℃、湿度４０〜６
０％下の環境で一日放置する。放置後、目視にてインク
の相分離の有無を確認する。図１に本試験の形態の例を
示すが、本発明の範囲内であればこれに限定されるもの
ではない。Phase separation confirmation test: A sample bottle having a capillary inlet and an air hole in the lid is filled with a certain amount of recording solution, and the height of the capillary is adjusted to form a meniscus on the surface of the capillary. The capillary used is preferably one having a diameter of 1 mm or less. The prepared sample was subjected to a temperature of 25 ° C. and a humidity of 40 to 6
Leave for one day under 0% environment. After standing, the presence or absence of phase separation of the ink is visually confirmed. FIG. 1 shows an example of the form of the present test, but the present invention is not limited thereto as long as it is within the scope of the present invention.
【００２４】次にカートリッジヘッド別体型のオンデマ
ント型圧電系インクジェットプリンタに搭載し以下の試
験を行う。Next, the printer is mounted on an on-demand type piezoelectric ink jet printer of a separate type with a cartridge head, and the following tests are performed.
【００２５】放置試験；ヘッドをプリンタに装着し正
常吐出確認後、カートリッジに接続したヘッドをノーキ
ャップ状態で常温−常湿下で３０日放置する。放置後、
ヘッドのノズル部を観察するとともに再度プリンタに装
着し吸引−ワイピングによる復帰操作を行い吐出状態を
確認する。Leaving test: After the head is mounted on the printer and normal ejection is confirmed, the head connected to the cartridge is left in a no-cap state at normal temperature and normal humidity for 30 days. After leaving
Observe the nozzle portion of the head and mount it on the printer again to perform a return operation by suction-wiping to check the discharge state.
【００２６】放置試験；ヘッドをプリンタに装着し正
常吐出確認後、カートリッジに接続したヘッドをノーキ
ャップ状態で４０℃−低湿下（湿度２０％以下）で１４
日放置する。放置後、ヘッドのノズル部を観察するとと
も再度プリンタに装着し吸引−ワイピングによる復帰操
作を行い吐出状態を確認する。Leaving test: After the head is mounted on the printer and normal ejection is confirmed, the head connected to the cartridge is kept in a no-cap state at 40 ° C.-low humidity (20% or less humidity).
Leave for a day. After the standing, the nozzle portion of the head is observed, and the head is attached to the printer again, and a return operation by suction-wiping is performed to check a discharge state.
【００２７】[0027]
（実施例１）記録液の配合比を下記に示す。 (Example 1) The mixing ratio of the recording liquid is shown below.
【００２８】 水 ６８重量％ グリセリン ７重量％ ポリエチレングリコール(分子量約２００） ８重量％ トリプロピレングリコール １０重量％ スチレン−アクリル酸−エトキシジエチレン グリコールアクリレート共重合体 １．５重量％ 分子量約４千 ジエタノールアミン ０．５重量％ カーボンブラック ５重量％Water 68% by weight Glycerin 7% by weight Polyethylene glycol (molecular weight: about 200) 8% by weight Tripropylene glycol 10% by weight Styrene-acrylic acid-ethoxydiethylene glycol acrylate copolymer 1.5% by weight Molecular weight: about 4,000 Diethanolamine 0 5% by weight Carbon black 5% by weight
【００２９】上記記録液についての試験結果を以下に示
す。 ・相分離試験結果；１日放置後毛細管上部に透明相が確
認された。 ・放置試験；放置後のノズル板のノズル穴にファイバ
ー状の針金を接触させたところ透明な液体が針金の先端
に付着したことよりノズル穴表面に透明な液体が存在す
ることを確認した。その後、ヘッドをプリンタに装着し
吸引−ワイピングによる復帰操作を行ったところ、１回
の復帰動作で全ノズルからインクが正常吐出した。 放置試験；放置後のノズル板のノズル穴にファイバー
状の針金を接触させたところ透明な液体が針金の先端に
付着したことよりノズル穴表面に透明な液体が存在する
ことを確認した。その後、ヘッドをプリンタに装着し吸
引−ワイピングによる復帰操作を行ったところ、１回の
復帰動作で全ノズルからインクが正常吐出した。The test results for the above recording liquid are shown below. -Phase separation test result: After standing for one day, a transparent phase was confirmed at the upper part of the capillary. -Leaving test: When a fiber-shaped wire was brought into contact with the nozzle hole of the nozzle plate after leaving, the transparent liquid was attached to the tip of the wire, and it was confirmed that the transparent liquid was present on the nozzle hole surface. Thereafter, the head was mounted on the printer and a return operation was performed by suction-wiping. As a result, ink was normally ejected from all nozzles in one return operation. Leaving test: When a fibrous wire was brought into contact with the nozzle hole of the nozzle plate after standing, it was confirmed that the transparent liquid was present on the nozzle hole surface because the transparent liquid adhered to the tip of the wire. Thereafter, the head was mounted on the printer and a return operation was performed by suction-wiping. As a result, ink was normally ejected from all nozzles in one return operation.
【００３０】（実施例２）記録液の配合比を下記の組成
にしたほかは実施例１と同じ試験を行った。(Example 2) The same test as in Example 1 was conducted except that the mixing ratio of the recording liquid was changed to the following composition.
【００３１】 水 ６３．５重量％ グリセリン １０重量％ １，３−プロパンジオール １５重量％ ジエチレングリコール ５重量％ ポリオキシエチレンノニルフェニルエーテル １．５重量％ 硫酸ジエタノールアミン塩 カーボンブラック ５重量％Water 63.5% by weight Glycerin 10% by weight 1,3-propanediol 15% by weight Diethylene glycol 5% by weight Polyoxyethylene nonylphenyl ether 1.5% by weight Diethanolamine sulfate carbon black 5% by weight
【００３２】上記記録液について実施例１と同様に相分
離試験、放置試験を行ったところ実施例１と同様の結果
を示した。A phase separation test and a standing test were performed on the recording liquid in the same manner as in Example 1, and the same results as in Example 1 were obtained.
【００３３】（比較例１）記録液の配合比を下記の組成
にしたほかは実施例１と同じ試験を行った。(Comparative Example 1) The same test as in Example 1 was conducted except that the mixing ratio of the recording liquid was changed to the following composition.
【００３４】 水 ６８重量％ グリセリン ２５重量％ スチレン−アクリル酸−エトキシジエチレン グリコールアクリレート共重合体 １．５重量％ ジエタノールアミン ０．５重量％ カーボンブラック ５重量％Water 68% by weight Glycerin 25% by weight Styrene-acrylic acid-ethoxydiethylene glycol acrylate copolymer 1.5% by weight Diethanolamine 0.5% by weight Carbon black 5% by weight
【００３５】上記記録液についての試験結果を以下に示
す。 相分離試験結果；１日放置後透明相は確認されなかっ
た。 放置試験；放置後のノズル板のノズル穴にファイバー
状の針金を接触させたところ黒色の増粘インクが針金の
先端に付着したことよりノズル穴表面で相分離が生じて
いないことがわかった。その後、ヘッドをプリンタに装
着し吸引−ワイピングによる復帰操作を行ったところ、
１回の復帰動作では完全に全ノズルを復帰することはで
きなかった。 放置試験；放置後のノズル板のノズル穴にファイバー
状の針金を接触させたところ黒色の増粘インクが針金の
先端に付着したことよりノズル穴表面で相分離が生じて
いないことがわかった。その後、ヘッドをプリンタに装
着し吸引−ワイピングによる復帰操作を行ったところ、
１回の復帰動作では完全に全ノズルを復帰することはで
きなかった。The test results for the above recording liquid are shown below. Phase separation test result: No clear phase was observed after standing for 1 day. Leaving test: When a fibrous wire was brought into contact with the nozzle hole of the nozzle plate after standing, black thickening ink adhered to the tip of the wire, indicating that no phase separation occurred on the nozzle hole surface. After that, when the head was attached to the printer and a return operation was performed by suction-wiping,
It was not possible to completely return all nozzles by one return operation. Leaving test: When a fibrous wire was brought into contact with the nozzle hole of the nozzle plate after standing, black thickening ink adhered to the tip of the wire, indicating that no phase separation occurred on the nozzle hole surface. After that, when the head was attached to the printer and a return operation was performed by suction-wiping,
It was not possible to completely return all nozzles by one return operation.
【００３６】（比較例２）記録液として市販の染料系イ
ンクを用い実施例１と同じ試験を行った。Comparative Example 2 The same test as in Example 1 was performed using a commercially available dye-based ink as a recording liquid.
【００３７】相分離試験結果；１日放置後透明相は確認
されなかった。 放置試験；放置後のノズル板のノズル穴を観察したと
ころ約半分のノズル穴より染料の結晶と思われる析出物
が確認された。析出物を除きファイバー状の針金をノズ
ル穴接触させたところ黒色の増粘インクが針金の先端に
付着した。ノズル穴表面で相分離が生じていないことが
わかった。その後、ヘッドをプリンタに装着し吸引−ワ
イピングによる復帰操作を行ったところ、１回の復帰動
作では完全に全ノズルを復帰することはできなかった。
更に１０回の復帰動作を行ったところ、不吐出ノズルが
数カ所あり、更に吐出ノズルも着弾精度が低下している
ことが確認された。 放置試験；放置後のノズル板のノズル穴を観察したと
ころ全ノズル穴より染料の結晶と思われる析出物が確認
された。析出物を除きファイバー状の針金をノズル穴接
触させたところ黒色の増粘インクが針金の先端に付着し
た。ノズル穴表面で相分離が生じていないことがわかっ
た。その後、ヘッドをプリンタに装着し吸引−ワイピン
グによる復帰操作を行ったところ、１回の復帰動作では
完全に全ノズルを復帰することはできなかった。更に１
０回の復帰動作を行ったところ、全ノズルから吐出はす
るものの着弾精度が低下していることが確認された。Phase separation test result: No clear phase was observed after one day of standing. Leaving test: When the nozzle hole of the nozzle plate after standing was observed, a precipitate considered to be a crystal of a dye was confirmed from about a half of the nozzle hole. When the fibrous wire was brought into contact with the nozzle hole except for the precipitate, the black thickening ink adhered to the tip of the wire. It was found that no phase separation occurred on the nozzle hole surface. Thereafter, the head was mounted on the printer and a return operation by suction-wiping was performed. As a result, it was not possible to completely return all the nozzles by one return operation.
When the return operation was further performed 10 times, it was confirmed that there were several non-discharge nozzles, and that the discharge accuracy of the discharge nozzles was also reduced. Leaving test: When the nozzle holes of the nozzle plate after standing were observed, precipitates considered to be dye crystals were confirmed from all the nozzle holes. When the fibrous wire was brought into contact with the nozzle hole except for the precipitate, the black thickening ink adhered to the tip of the wire. It was found that no phase separation occurred on the nozzle hole surface. Thereafter, the head was mounted on the printer and a return operation by suction-wiping was performed. As a result, it was not possible to completely return all the nozzles by one return operation. One more
When the return operation was performed 0 times, it was confirmed that the ejection accuracy was reduced although the ejection was performed from all the nozzles.
【００３８】[0038]
【発明の効果】以上述べたように、本発明の記録液は耐
目詰まり性に優れることがわかる。As described above, it can be seen that the recording liquid of the present invention has excellent clogging resistance.
【００３９】更に本発明による記録液はノズル面が大気
に暴露された際、相分離し、保湿剤濃度の高い透明液相
がメニスカス表面に形成されることから記録液の水分の
さらなる蒸発が妨げられ、相分離を生じない記録液に比
べ、透明相下の記録液の粘度上昇を軽減化することが可
能となる。この事より放置後の吸引による復帰動作、及
びワイピングによるふき取り動作条件を簡便なものとす
る事が可能となる。Furthermore, when the nozzle surface is exposed to the atmosphere, the recording liquid of the present invention undergoes phase separation, and a transparent liquid phase having a high humectant concentration is formed on the meniscus surface, so that further evaporation of the water of the recording liquid is prevented. As a result, it is possible to reduce an increase in viscosity of the recording liquid under the transparent phase as compared with a recording liquid that does not cause phase separation. This makes it possible to simplify the return operation by suction after leaving and the wiping operation condition by wiping.
【００４０】更に本発明による記録液はノズル面が大気
に暴露された際、結晶析出などの固形物の付着が生じな
いことより、放置後の復帰動作時も記録液の水分、揮発
性添加物が蒸発した増粘インクの除去が容易で、復帰動
作後のドット抜け、着弾位置のずれ等の吐出不良等をな
くすことが可能となる。Further, when the nozzle surface is exposed to the air, the recording liquid according to the present invention does not cause solid matter such as crystal precipitation to adhere to the nozzle surface. It is easy to remove the thickened ink from which the ink has evaporated, and it is possible to eliminate ejection failures such as missing dots after the return operation and displacement of the landing position.
【図１】本発明の記録液の実施例における相分離確認試
験の形態の１例である。FIG. 1 is an example of a form of a phase separation confirmation test in an example of a recording liquid of the present invention.
Claims (1)
少なくとも分散剤、水溶性液媒体、保湿剤、顔料、水か
ら構成される水性顔料系記録液であって、かかる記録液
がノズル穴表面でメニスカスを形成し、大気暴露された
際、記録液中の水分が蒸発する事で相分離を生じ、かか
る相分離後のメニスカスを形成する表層が保湿剤濃度の
高い透明相であって耐目詰まり性に優れている事を特徴
とする記録液。1. A recording liquid used for ink-jet recording is an aqueous pigment-based recording liquid comprising at least a dispersant, a water-soluble liquid medium, a humectant, a pigment, and water. When exposed to the atmosphere, the water in the recording liquid evaporates to cause phase separation, and the surface layer that forms the meniscus after such phase separation is a transparent phase with a high humectant concentration and is resistant to clogging. A recording liquid characterized by having excellent characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28674097A JPH11116872A (en) | 1997-10-20 | 1997-10-20 | Recording liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28674097A JPH11116872A (en) | 1997-10-20 | 1997-10-20 | Recording liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11116872A true JPH11116872A (en) | 1999-04-27 |
Family
ID=17708421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28674097A Pending JPH11116872A (en) | 1997-10-20 | 1997-10-20 | Recording liquid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11116872A (en) |
-
1997
- 1997-10-20 JP JP28674097A patent/JPH11116872A/en active Pending
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