JP2007092065A - Device for recording - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording liquid excellent in color development on regular paper, high in image storing such as photo stability, etc., with improved reliability, and to provide an ink for inkjet and to provide a device for ink cartridge inkjet. <P>SOLUTION: The invention relates to the device for recording using the recording liquid comprising a color material, an organic solvent dispersing or dissolving the same, water, a compound producing a multivalent metal ion and a cyclic compound represented by formula (1), (in the formula x is 4-8), or its salt, wherein the cyclic compound and the compound producing a multivalent metal ion form a phenolate type complex in an alkaline condition. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a composition of an aqueous recording liquid suitable for inkjet recording, in particular, a recording liquid exhibiting excellent characteristics with respect to so-called plain paper, and also relates to a recording method and a recording apparatus suitable for this recording liquid. , Water-based writing instruments, recorders, and water-based ink compositions for pen plotters.

In recent years, various investigations have been made for the purpose of improving the appropriateness of printing on plain paper and improving the robustness of inkjet printers. In particular, improvement of plain paper color images has been promoted by reducing character bleeding and bleed between colors.
In addition, various studies have been made for the purpose of improving the fastness of water resistance and light resistance. In particular, ink jet printers and plotters that use inks that use pigments as colorants have been put on the market, but there are problems with reliability such as the occurrence of clogging compared to dye inks. Further, for the purpose of preventing bleeding, ink using fine particles colored with a dye or pigment has been studied, but there is a problem of clogging due to adhesion to the nozzle portion.

  In addition, for the purpose of replacing silver salt photography, high density is achieved by using density gradation by using dark ink and light ink together with area gradation, and the image quality equivalent to silver salt is almost glossy for inkjet. Reproduced on paper. However, the light resistance is still insufficient, and the density and saturation of the plain paper image quality are inferior to those of the electrophotographic method.

Therefore, in order to improve the light resistance, studies have been made on the addition of an ultraviolet absorber and an antioxidant. For example, in Patent Document 1 (Japanese Patent Laid-Open No. 4-227773), the addition of an ultraviolet absorber having a hydrophilic group introduced therein is studied. However, in water-based inks, clogging or the like occurs due to the fact that they are easily crystallized. There was a problem that it was easy to happen.
In addition, for the purpose of preventing ozone fading, Patent Document 2 (Japanese Patent Laid-Open No. 2-228378) encapsulates a photofading inhibitor such as an antioxidant in a liposome, but sufficient reliability can be obtained. It wasn't.

  For the purpose of preventing fading, an attempt has been made to add a compound that includes a dye. For example, β-cyclodextrin is added to light-colored magenta ink to prevent fading, but β-cyclodextrin has a large increase in viscosity due to its addition, so an amount sufficient for inclusion in the case of high concentration ink. When added, there is a problem that the viscosity is high and the discharge becomes difficult.

Attempts have also been made to improve the reliability by including an insoluble highly water-resistant colorant with cyclodextrin. Patent Document 3 (Japanese Patent No. 2612661) discloses an ink in which an alcohol-soluble or oil-soluble dye is included in a cyclodextrin or polycyclodextrin solubilized in the ink. However, depending on the dye, there are cases where sufficient reliability cannot be obtained to obtain a high density image.
An attempt to ensure reliability and improve light resistance by binding an ultraviolet absorber to cyclodextrin is disclosed in Patent Document 4 (Japanese Patent Publication No. 11-506800). Depending on the type, sufficient effects could not be obtained.

  On the other hand, for the purpose of suppressing bleeding at the color boundary, it has been studied to add a compound that precipitates the color material of the ink of another color into the ink. For example, Patent Document 5 (patent document 5) discloses an ink set which is used for a color ink to which a water-soluble calcium salt or magnesium salt is added together with a relatively high water-soluble dye as a coloring material and which suppresses blurring at the boundary with a slowly penetrating black ink. (Kaihei 10-219160). Further, an ink set is disclosed in Japanese Patent Application Laid-Open No. 11-323225 which uses an ink to which a quaternary ammonium salt and / or a water-soluble polyvalent metal salt is added to suppress blurring at the boundary with a slowly penetrating self-dispersing carbon ink. No.). However, since there is a combination of dyes to which salts can be added, there is a problem that the water resistance of the color ink is not sufficient.

  By the way, in order to improve the suitability of plain paper, various attempts have been made to improve the reliability of ink using pigments, colored fine particles and the like as color materials. For example, Japanese Patent Application Laid-Open No. 10-330665 discloses an ink obtained by adding urea or a urea derivative to a pigment ink using self-dispersing carbon. Also disclosed is an ink whose reliability is improved by adding urea or the like to resin fine particles colored with a dye or pigment.

  Both inks are particularly suitable when using a recording head with high discharge pressure using thermal energy, but in the case of an actuator using a piezo method or electrostatic force, ammonia and carbon dioxide due to the decomposition of urea are used for the discharge characteristics. There was a case to have an influence. Even in the method using thermal energy, there was a decrease in reliability due to ink contact depending on the head member.

  This is particularly noticeable with certain dyes and self-dispersing carbon inks, but in addition to the effects of carbon dioxide in the air, the pH may drop due to the remarkable dissolution of acidic substances into the ink when stored at high temperatures. There is a problem that this causes deterioration of the liquid contact member.

JP-A-4-227773 JP-A-2-228378 Japanese Patent No. 2612661 Japanese National Patent Publication No. 11-506800 JP-A-10-219160 JP-A-11-323225 Japanese Patent Laid-Open No. 10-330665

A first object of the present invention is to provide a recording liquid and an ink jet ink that satisfy various characteristics, have excellent color developability on plain paper, have high image storage stability such as light stability, and improved reliability. There is.
The second object of the present invention is to present a more preferable embodiment of the compound salt added for the purpose of improving the above-mentioned properties.
The third object of the present invention is to present a more preferred limited embodiment of the compound salt.
The fourth and fifth objects of the present invention are to present a more preferable limited embodiment in which the safety of the compound salt is excellent.
A sixth object of the present invention is to provide a recording liquid and ink jet ink that can suppress bleeding at the color boundary and improve the light stability and water resistance.
A seventh object of the present invention is to show an additive that can be suitably used without affecting the color tone of an image.
An eighth object of the present invention is to provide a recording liquid and ink jet ink having improved light stability, which is particularly preferable for color reproducibility in plain paper.
A ninth object of the present invention is to provide a recording liquid and ink-jet ink having improved light stability, which is a balance between color tone and water resistance in plain paper.
A tenth object of the present invention is to provide a highly reliable ink-jet pigment ink which has high water resistance and light resistance on plain paper and improved color boundary bleeding compared to conventional paper.
An eleventh object of the present invention is to provide a recording liquid having excellent reliability in a printing system and an inkjet pigment ink.
A twelfth object of the present invention is to provide a recording liquid and ink jet pigment ink which have good fixability and high reliability.
A thirteenth object of the present invention is to provide a recording liquid and ink jet pigment ink that have high ejection stability even after a long pause.
A fourteenth object of the present invention is to provide a recording liquid and an ink jet pigment ink which are particularly excellent in water resistance and color boundary bleeding and have high ejection stability.
A fifteenth object of the present invention is to provide a recording liquid and an ink jet ink which can improve color reproducibility and glossiness on plain paper and can obtain an image having high light stability.
A sixteenth object of the present invention is to provide a colored fine particle recording liquid and ink jet ink which are excellent in reliability in a printing system and have little image deterioration.
A seventeenth object of the present invention is to disclose a water-soluble organic solvent which is added to impart moisture retention to an ink and to obtain a discharge stable physical property range.
The eighteenth and nineteenth objects of the present invention are to disclose an embodiment in which wettability to a recording medium is improved.
A twentieth object of the present invention is to disclose a range of physical properties that have good compatibility with members in a printing system and good storage stability.
A twenty-first object of the present invention is to disclose a recording method capable of forming a good image using the ink.
A twenty-second object of the present invention is to provide an ink cartridge capable of forming a good image using the ink.
A twenty-third object of the present invention is to provide an inkjet device capable of forming a good image using the ink.

  The above-described problem is provided with the “recording liquid container or recording liquid cartridge for storing the recording liquid, a head unit for recording and discharging the recording liquid by the action of thermal energy or mechanical energy, or a recording unit”. In the ink jet recording apparatus, as the recording liquid, a coloring material, an organic solvent in which the coloring material is dispersed or dissolved, water, a polyvalent metal ion source compound, and a cyclic compound represented by the following formula (1) or a salt thereof: A recording apparatus comprising: a recording liquid that contains a cyclic complex and a polyvalent metal ion to form a phenolate complex in an alkali;

（式中、ｘは４〜８を表わす。）」によって達成される。

(Wherein x represents 4 to 8) ".

According to the present invention, a recording liquid that satisfies various characteristics by adding a water-soluble calixarene, has excellent color developability on plain paper, has high image storage stability such as light stability, and improved reliability, Ink jet ink can be provided, and by presenting a more preferable embodiment of the compound salt represented by the formula (1) added for the purpose of improving the above characteristics, it is possible to provide storage stability and contact within a recording apparatus or recording apparatus. It is possible to provide a recording liquid having improved liquidity and an inkjet ink. In addition, by presenting a preferable limited embodiment of the compound of the formula (1), it is possible to provide a highly reliable recording liquid and ink-jet ink. Further, the compound of the formula (1) is more safe. By presenting an excellent and more preferable limited aspect, it is possible to provide a recording liquid and ink jet ink that satisfy various characteristics relating to recording and have high safety. Also provided are a recording liquid and an ink jet ink that contain a polyvalent metal ion that becomes a phenolate complex of the formula (1), thereby suppressing bleeding at the color boundary and improving light stability and water resistance. Recording liquids and ink jets that can suppress color boundary bleeding and improve light stability and water resistance without affecting the color tone of the image by limiting to compounds that can be polyvalent metal ion sources Ink can be provided. Further, by using a dye together with the compound of the formula (1), it is possible to provide a recording liquid and an ink jet ink having improved light stability, which is particularly preferable for color reproducibility on plain paper, and the compound of the formula (1) In addition, by using a dye having a sulfonic acid or carboxylic acid group introduced therein, it is possible to provide a recording liquid and ink-jet ink with improved light stability that balances color tone and water resistance on plain paper. In addition, by using the compound of formula (1) and a pigment, it is possible to provide a highly reliable ink-jet pigment ink that has high water resistance and light resistance in plain paper, and improved color boundary bleeding compared to the prior art. By using the compound of the formula (1) and a pigment having a particle diameter in a specific range, it is possible to provide a recording liquid having excellent reliability in a printing system and an ink-jet pigment ink, together with the compound of the formula (1). By using a pigment dispersed with a carboxyl group-introduced dispersant, it is possible to provide a highly reliable and reliable recording liquid and inkjet pigment ink, which is surface-modified with the compound of formula (1). By using the pigment, it is possible to provide a recording liquid having high ejection stability even after a long pause and an inkjet pigment ink, and the pigment surface is hydrophilic together with the compound of the formula (1). By using a pigment having a carboxyl group introduced as the above, it is possible to provide a recording liquid having excellent water resistance, excellent color boundary bleeding and high ejection stability, and a pigment ink for ink jet. Alternatively, by using fine particles colored with a pigment, it is possible to provide a recording liquid and an ink jet ink which can improve color reproducibility and glossiness on plain paper and can obtain an image with high light stability. Further, by using colored fine particles having a particle diameter in a specific range used together with the compound of the formula (1), it is possible to provide a colored fine particle recording liquid and ink jet ink having excellent reliability in a printing system and little image deterioration. Disclosed is a water-soluble organic solvent that is added to provide moisture retention together with the compound of formula (1) and to obtain a discharge-stable physical property range. Liquids and ink-jet inks can be provided. Further, by adding a specific surfactant together with the compound of the formula (1), it is possible to provide a highly reliable recording liquid with improved wettability to a recording medium and an inkjet ink. By adding a specific solvent-based penetrant together with the above compound, it is possible to provide a highly reliable recording liquid and ink jet ink with improved wettability to a recording medium. Further, by containing the compound of the formula (1) and setting the pH within a certain specific range, it is possible to obtain a physical property range having good compatibility with members in the printing system and good storage stability.
In addition, it is possible to provide a recording method in which a good image can be formed on plain paper by forming an image under specific conditions using the ink. An ink jet device capable of forming a good image by forming an ink cartridge capable of forming a good image by using the ink in a recording device that forms an image as droplets by thermal energy or mechanical energy is provided. There is an extremely excellent effect that it can be provided.

  The calix [n] arene-p-sulfonic acid represented by the following formula (1) used in the present invention has a phenolic hydroxyl group and functions as an antioxidant as disclosed in JP-A-4-100890. ing. Further, like other inclusion compounds, other compounds having a hydrophobic group in the ring are included. It is also known that an OH group and a metal ion are complexed (Nikka, 583, N09, 1999). Moreover, since it has a sulfonic acid group, its solubility in water is high, and depending on the number of x, it has a feature that it is dissolved in water at 25 ° C. by 8 to 20%.

The present inventor has paid attention to this feature and conducted comparative studies together with the inclusion compound and the light stabilizer that have been studied in the conventional recording liquid. As a result, it has been found that the problems of various conventional methods are improved.
In particular, the dissociation state of sulfonic acid groups and phenolic OH groups changes due to changes in pH, and the ability to form complexions of metal ions and organic cations changes. It has become clear that a function of suppressing color boundary bleeding can also be imparted.

  Examples of the case where the pH is high and the case where it is low in the compound represented by the formula (1) and the formula (1) of the present invention are shown below.

（式中、フェノラート錯体としては、金属イオンまたは有機カチオンが示され、Ｍが配位、Ｎ⁺は一価カチオンを示す。）
前記、ｐＨが高い状態では、インク中で色材の凝集を抑えることが可能であり、ｐＨが低い状態では、色材により不溶化させたり、水溶性を下げ耐水性を付与することができることが明らかとなった。

(In the formula, as the phenolate complex, a metal ion or an organic cation is shown, M is a coordination, and N ⁺ is a monovalent cation.)
When the pH is high, it is possible to suppress aggregation of the coloring material in the ink, and when the pH is low, it is clear that the coloring material can be insolubilized, water solubility can be reduced, and water resistance can be imparted. It became.

  Also, when pigments, colored fine particles, or dispersible dyes are used as water-dispersible color materials, polyvalent metal ions due to contamination during ink production or in the system are supplemented, or the hydrophobic groups of the color materials themselves are included. Therefore, it was revealed that the storage characteristics can be improved.

  In the conventional formulation, the compound of the formula (1) of the present invention is an alkali metal ion, a quaternary ammonium, a phosphonium, etc., for a colorant having a large pH drop due to the influence of carbon dioxide gas or the like during high temperature storage. It has been clarified that inclusion of an organic cation improves pH buffering properties and improves ink storage and liquid contact properties. Further, the corrosion preventing effect was found by suppressing the deterioration of the wetted member due to its function as an antioxidant.

  The ink of the present invention is not only an ink using PZT pressure, an ink ejected by a diaphragm deflected by electrostatic force, or a bubble jet (registered trademark) type drop-on-demand ink jet printer using film boiling. Can be favorably used in any printer of a so-called charge control system that charges the battery and vibrates with PZT. In particular, even a nozzle with a small nozzle diameter of 20 μm or less can be stably ejected due to its high reliability.

  The calix [n] arene-p-sulfonic acid which is the compound represented by the formula (1) is calix [4] arene, calix [5] arene, calix [6] arene, calix [ 7] The corresponding sulfonate represented by the formula (1) can be obtained by sulfonating the arene with concentrated sulfuric acid at about 80 ° C. Sodium salts are commercially available from Sugai Chemical Industry as CALX-S4, CALX-S6, and CALX-S8.

  These can remove impurities by recrystallization in a water-methanol mixed solvent. Further, inorganic salts such as sodium chloride can be removed by treating the aqueous solution with a reverse osmosis membrane, an ion exchange resin, an ultrafiltration membrane or the like. In particular, in order to increase the reliability, the stability of the recording liquid is improved by using a lithium salt as an alkali salt, or by using a quaternary ammonium salt, phosphonium salt, or alkanolamine salt.

  Examples of quaternary ammonium and phosphonium hydroxides that can be used together with the formula (1) to give preferred salts include compounds of the following formula (I), and specific examples thereof include those shown in Table 1.

（式中、Ｘは窒素又はリン、Ｒ¹〜Ｒ⁴は水素、炭素数１〜４のアルキル基、ヒドロキシアルキル基、ハロゲン化アルキル基を表わす。）

(In the formula, X represents nitrogen or phosphorus, R ^{1 to} R ⁴ represent hydrogen, an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group, or a halogenated alkyl group.)

  In the table, it is preferable to use a hydroxide salt of (I-2), (I-4), or (I-7) having a hydroxyl group as a compound having particularly excellent storage stability. These are preferably neutralized with a sulfonic acid group and 0.3 mole or more. Moreover, you may neutralize a part of phenolic hydroxyl group.

In the present invention, examples of water-soluble salts added for the purpose of suppressing color boundary bleeding and improving the light resistance and water resistance of dyes include quaternary ammonium salts and polyvalent metal salts. Preferably, a salt of a polyvalent metal ion in which the compound of the formula (1) is complexed with a phenolate type is exemplified. The ions include alkaline earth metals Be ²⁺ , Mg ²⁺ , Ca ²⁺ , Sr ²⁺ , Ba ^2+, etc., Group 3B Al ³⁺ , Ga ³⁺ , In ³⁺ , Sn ^4+, etc. Metals Ti ⁴⁺ , Fe ³⁺ , Co ²⁺ , Cu ²⁺ etc., lanthanoid metals La ³⁺ , Ce ³⁺ , Pr ³⁺ , Nd ³⁺ , Sm ³⁺ , Eu ³⁺ , Gd ³⁺ etc. Is mentioned.

  In particular, when a water-soluble alkaline earth metal salt, lanthanoid metal salt, or zinc salt having a solubility in water of 1 g / 100 g or more is dissolved in water, the compound of formula (1) and the phenolate complex or salt are added. It is preferable because it is easy to form.

  More specifically, magnesium nitrate (42.1 g), magnesium sulfate (26.7 g), magnesium chloride (35.5 g), lanthanum chloride (49.27 g), lanthanum nitrate (56.1 g), lanthanum sulfate (2 .25 g), calcium chloride (45.3 g), calcium nitrate (57.98 g), zinc nitrate (56.1 g), and the like.

The addition amount of these salts is appropriately selected depending on the characteristics of the color material used in the ink set for forming a color image, but is added at 0.1 to 10% by weight. When the addition amount is 0.1% by weight or less, the improvement effect is small, and when it is 10% by weight or more, precipitation due to temperature change or ejection failure due to water evaporation near the nozzle tends to occur.
The amount of the coloring material in the ink of the present invention is 0.1 to 20% by weight, preferably 0.2 to 8% by weight, although it depends on the purpose of use. If it is 0.1% by weight or less, there is no coloring power even when used in light color ink, and if it is 20% by weight or more, the viscosity is high and it is difficult to eject.

  As the water-soluble dye used in the present invention, it can be used by mixing with other colorants as required. As the water-soluble dyes used, those having excellent water resistance and light resistance among dyes classified in the color index as acid dyes, direct dyes, basic dyes, reactive dyes, and food dyes are used.

  Specific examples of these dyes include C.I. and acid dyes. I. Acid Yellow 17, 23, 42, 44, 79, 142, C.I. I. Acid Red 1, 8, 13, 14, 18, 26, 27, 35, 37, 42, 52, 82, 87, 89, 92, 97, 106, 111, 114, 115, 134, 186, 249, 254 289, C.I. I. Acid Blue 9, 29, 45, 92, 249, C.I. I. Acid Black 1, 2, 7, 24, 26, 94, C.I. I. Food Yellow 3, 4, C.I. I. Food Red 7, 9, 14, C.I. I. Food Black 1 and 2 can be mentioned, and as a direct dye, C.I. I. Direct yellow 1, 12, 24, 26, 33, 44, 50, 86, 120, 132, 142, 144, C.I. I. Direct Red 1, 4, 9, 13, 17, 20, 28, 31, 39, 80, 81, 83, 89, 225, 227, C.I. I. Direct Orange 26, 29, 62, 102, C.I. I. Direct Blue 1, 2, 6, 15, 22, 25, 71, 76, 79, 86, 87, 90, 98, 163, 165, 199, 202, C.I. I. Direct black 19, 22, 32, 38, 51, 56, 71, 74, 75, 77, 154, 168, 171 can be mentioned. I. Basic yellow 1, 2, 11, 13, 14, 15, 19, 21, 23, 24, 25, 28, 29, 32, 36, 40, 41, 45, 49, 51, 53, 63, 64, 65, 67, 70, 73, 77, 87, 91, C.I. I. Basic Red 2, 12, 13, 14, 15, 18, 22, 23, 24, 27, 29, 35, 36, 38, 39, 46, 49, 51, 52, 54, 59, 68, 69, 70, 73, 78, 82, 102, 104, 109, 112, C.I. I. Basic blue 1, 3, 5, 7, 9, 21, 22, 26, 35, 41, 45, 47, 54, 62, 65, 66, 67, 69, 75, 77, 78, 89, 92, 93, 105, 117, 120, 122, 124, 129, 137, 141, 147, 155, C.I. I. Basic Black 2 and 8 are listed, and reactive dyes include C.I. I. Reactive Black 3, 4, 7, 11, 12, 17, C.I. I. Reactive Yellow 1, 5, 11, 13, 14, 20, 21, 22, 25, 40, 47, 51, 55, 65, 67, C.I. I. Reactive Red 1, 14, 17, 25, 26, 32, 37, 44, 46, 55, 60, 66, 74, 79, 96, 97, 180, C.I. I. Reactive blue 1, 2, 7, 14, 15, 23, 32, 35, 38, 41, 63, 80, 95 and the like can be used. In particular, acid dyes and direct dyes can be preferably used.

  In addition, Projet (trade name) series dyes such as Projet Cyan 2, Projet Magenta 2 and Projet Yellow 2 manufactured by Avisia, which have been developed as ink jet dyes, are also preferable.

  Particularly preferred dyes in the present invention are those into which sulfonic acid or carboxylic acid is introduced in view of the balance between water resistance and reliability. Specific examples include those shown in Table 2 below when described in free acid form, but are not limited thereto.

  As pigments used in the present invention, organic pigments such as azo, phthalocyanine, anthraquinone, dioxazine, indigo, thioindigo, perylene, isoindolenone, aniline black, azomethine, rhodamine B lake pigment, carbon Examples of the inorganic pigment include iron oxide, titanium oxide, calcium carbonate barium sulfate, aluminum hydroxide, barium yellow, bitumen, cadmium red, chrome yellow, and metal powder.

  More specifically, as black pigments, carbon blacks (CI Pigment Black 7) such as furnace black, lamp black, acetylene black, channel black, or copper oxides, iron oxides (C.I. Pigment black 11), metals such as titanium oxide, and organic pigments such as aniline black (CI pigment black 1).

  As a pigment for color ink, C.I. I. Pigment Yellow 1 (Fast Yellow G), 3, 12 (Disazo Yellow AAA), 13, 14, 17, 23, 24, 34, 35, 37, 42 (Yellow Iron Oxide), 53, 55, 74, 81, 83 (Disazo Yellow HR), 95, 97, 98, 100, 101, 104, 108, 109, 110, 117, 120, 128, 138, 150, 153, C.I. I. Pigment Red 1, 2, 3, 5, 17, 22 (Brilliant First Scarlet), 23, 31, 38, 48: 2 (Permanent Red 2B (Ba)), 48: 2 (Permanent Red 2B (Ca)), 48 : 3 (Permanent Red 2B (Sr)), 48: 4 (Permanent Red 2B (Mn)), 49: 1, 52: 2, 53: 1, 57: 1 (Brilliant Carmine 6B), 60: 1, 63: 1, 63: 2, 64: 1, 81 (Rhodamine 6G Lake), 83, 88, 92, 101 (Bengara), 104, 105, 106, 108 (Cadmium Red), 112, 114, 122 (Dimethylquinacridone), 123, 146, 149, 166, 168, 170, 172, 177, 178, 179, 185, 190, 193, 209, 2 9, C. as for cyan I. Pigment Blue 1, 2, 15 (copper phthalocyanine blue R), 15: 1, 15: 2, 15: 3 (phthalocyanine blue G), 15: 4, 15: 6 (phthalocyanine blue E), 16, 17: 1, 56, 60, 63, etc. can be used.

Further, the following pigments can be used alone or in combination for red, green, and blue as intermediate colors.
C. I. Pigment red 177, 194, 224, C.I. I. Pigment orange 43, C.I. I. Pigment violet 3, 19, 23, 37, C.I. I. Pigment Green 7, 36 etc.

The black is carbon black produced by the furnace method and the channel method as carbon black, the primary particles are 15 nm to 40 nm, the specific surface area by the BET adsorption method is 50 to 300 m ² / g, and the DBP oil absorption is 40 to 150 ml. / 100 g, those having a volatile content of 0.5 to 10% and a pH of 2 to 9 are used, and acidic carbon black having a pH of 6 or less is particularly preferred at a high concentration. Further, carbon black treated with hypochlorous acid, carbon black treated with a sulfonating agent, and carbon black treated with a diazonium compound and introduced with an anionic dissociating group such as sulfonic acid or carboxylic acid are more preferable. As a yellow pigment, C.I. I. Pigment Yellow 74, 128, and 138 are preferable. As magenta pigments, quinacridone C.I. I. Pigment Red 122 and 209 are preferable. Cyan is a phthalocyanine compound C.I. I. Pigment Blue 15: 3, aluminum coordination phthalocyanine, and metal-free phthalocyanine are preferable. Among these color organic pigments, pigments into which a sulfonic acid group or a carboxylic acid group has been introduced by surface treatment are further excellent in dispersion stability, and those capable of obtaining dispersion stability without a dispersant can be suitably used as self-dispersing pigments. . In addition, pigments encapsulated on the surface, pigments grafted with a polymer, and the like can also be made highly reliable inks with excellent dispersion stability.

Reference example 1
Carbon black dispersion treated with hypochlorous acid <1>
After mixing 300 g of commercially available acidic carbon black having a pH of 2.5 (trade name Monarch 1300, manufactured by Cabot Corporation) with 1000 ml of water, 450 g of sodium hypochlorite (effective chlorine concentration: 12%) was added dropwise, Stir at 105 ° C. for 8 hours. To this solution, 100 g of sodium hypochlorite (effective chlorine concentration 12%) was further added and dispersed for 3 hours with a horizontal disperser. The resulting slurry was diluted 10 times with water, pH was adjusted with lithium hydroxide, desalted and concentrated with an ultrafiltration membrane to an electric conductivity of 0.2 mS / cm, and a carbon black dispersion having a pigment concentration of 15% Liquid. Coarse particles were removed by centrifugation, and further filtered through a 1 micron nylon filter to obtain a carbon black dispersion <1>. The total content of Fe, Ca and Si was 100 ppm or less as measured by ICP. The chlorine ion concentration was also set to 10 ppm or less. The average particle size (D50%) measured by Microtrac UPA was 95 nm.

Reference example 2
Carbon black dispersion treated with sulfonating agent <2>
150 g of commercially available carbon black pigment (Degussa, Printex # 85) was mixed well into 400 ml of sulfolane, finely dispersed with a bead mill, 15 g of amidosulfuric acid was added, and the mixture was stirred at 140 to 150 ° C. for 10 hours. The obtained slurry is put into 1000 ml of ion-exchanged water, and a surface-treated carbon black wet cake is obtained by a centrifuge at 12000 rpm. This carbon black wet cake was redispersed in 2000 ml of ion exchange water, pH was adjusted with lithium hydroxide, and desalted and concentrated with an ultrafiltration membrane to obtain a carbon black dispersion having a pigment concentration of 10% by weight. This was filtered through a 1 micron nylon filter to obtain a carbon black dispersion <2>. The total content of Fe, Ca and Si was 100 ppm or less as measured by ICP. The sulfate ion concentration was also 100 ppm or less. The average particle size was 80 nm.

Reference example 3
Carbon black dispersion treated with diazo compound <3>
100 g of carbon black having a surface area of 230 m ² / g and a DBP oil absorption of 70 ml / 100 g and 34 g of p-amino-N-benzoic acid are mixed and dispersed in 750 g of water, and 16 g of nitric acid is added dropwise thereto and stirred at 70 ° C. did. After 5 minutes, a solution of 11 g of sodium nitrite dissolved in 50 g of water was added, and the mixture was further stirred for 1 hour. The resulting slurry was diluted 10 times and centrifuged to remove coarse particles, the pH was adjusted with diethanolamine to pH 8-9, desalted and concentrated with an ultrafiltration membrane, and a carbon black dispersion having a pigment concentration of 15% did. This was made into a carbon black dispersion <3> using a polypropylene 0.5 μm filter. The total content of Fe, Ca and Si was 100 ppm or less as measured by ICP. The nitrate ion concentration was 10 ppm or less. The average particle size was 99 nm.

Reference example 4
Carbon black dispersion treated with diazo compound <4>
Example 1: Preparation of a carbon black product A solution of about 75 ° C. containing 2 liters of water and 43 g of sulfanilic acid was stirred into 202 g of carbon black having a surface area of 230 m ² / g and 70 ml / 100 g of DBPA. Added. The mixture was cooled to room temperature with stirring and 26.2 g of concentrated nitric acid was added. A 20.5 g solution of sodium nitrite in water was added. 4-Sulfobenzenediazonium hydroxide inner salt was prepared and reacted with carbon black. The dispersion was stirred until the generated foaming stopped. The resulting slurry was diluted, adjusted to pH with lithium hydroxide to remove coarse particles by centrifugation, and subsequently desalted and concentrated with an ultrafiltration membrane to obtain a carbon black having a pigment concentration of 15%. A dispersion was obtained. This was filtered through a polypropylene 1 μm filter to obtain a carbon black dispersion <4>. The total content of Fe, Ca and Si was 100 ppm or less as measured by ICP. The nitrate ion concentration was 50 ppm or less. The average particle size was 95 nm.

Reference Example 5
Surface-treated color pigment dispersion (yellow dispersion <1>, magenta dispersion <1>, cyan dispersion <1>)
As a yellow pigment, C.I. I. Pigment Yellow 128 was subjected to low-temperature plasma treatment to prepare a pigment having a carboxylic acid group introduced. A dispersion of this in ion-exchanged water was desalted and concentrated with an ultrafiltration membrane to obtain a yellow pigment dispersion <1> having a pigment concentration of 15%. The average particle diameter was 70 nm, and the total content of Fe, Ca, and Si was 100 ppm or less.
Similarly, C.I. I. Using pigment magenta 122, a magenta dispersion <1> having a pigment concentration of 15% was prepared. The total content of average particles 60 nm, Fe, Ca, Si was 100 ppm or less.
Similarly, C.I. I. A cyan dispersion <1> having a pigment concentration of 15% was prepared using Pigment Cyan 15: 3. The average particle diameter was 80 nm, and the total content of Fe, Ca, and Si was 100 ppm or less.

In the present invention, a pigment dispersion using a pigment dispersant can also be used.
As a pigment dispersant, as a hydrophilic polymer, in a natural system, vegetable polymers such as gum arabic, tragan gum, guar gum, karaya gum, locust bean gum, arabinogalactone, pectin, quince seed starch, alginic acid, carrageenan, agar, etc. Seaweed polymers, animal polymers such as gelatin, casein, albumin and collagen, microbial polymers such as xanthene gum and dextran, and semisynthetic systems such as methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, etc. Fibrin polymers, starch polymers such as sodium starch glycolate and starch phosphate sodium, seaweed polymers such as sodium alginate and propylene glycol alginate, Synthetic systems include vinyl polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, and polyvinyl methyl ether, non-crosslinked polyacrylamide, polyacrylic acid and its alkali metal salts, acrylic resins such as water-soluble styrene acrylic resins, and water-soluble styrene maleic resins. Water-soluble vinyl naphthalene acrylic resin, water-soluble vinyl naphthalene maleic acid resin, polyvinyl pyrrolidone, polyvinyl alcohol, alkali metal salt of β-naphthalene sulfonic acid formalin condensate, cationic functional groups such as quaternary ammonium and amino groups Examples thereof include a polymer compound having a salt in the side chain and a natural polymer compound such as shellac.

In particular, those in which a carboxylic acid group such as a homopolymer of acrylic acid, methacrylic acid or styrene acrylic acid or a copolymer of a monomer having another hydrophilic group is introduced is preferable as the polymer dispersant.
In addition, when a surfactant is used, anionic surfactants such as polyoxyethylene alkyl ether phosphate and polyoxyethylene alkyl ether acetate, and nonionic surfactants such as nonylphenyl ether can also be used.

<Reference Example 6>
Dispersant pigment dispersion (surfactant dispersion: yellow dispersion <2>, magenta dispersion <2>, cyan dispersion <2>, polymer dispersion: yellow dispersion <3>, magenta dispersion <3>, Cyan dispersion <3>)
Yellow pigment: C.I. I. Pigment Yellow 128
Magenta pigment: C.I. I. Pigment Red 122
Cyan pigment: C.I. I. Pigment Blue 15: 3
Dispersant A: Nonionic surfactant manufactured by Kao Corporation, Emulgen 913), HLB 15.5
Dispersant B: Acrylic resin aqueous solution manufactured by Johnson Polymer Co., Ltd., Joncryl 611 (ammonia neutralized, solid content 20%), acid value 57

(1) Salt milling refinement process In a stainless steel 1 gallon kneader (manufactured by Inoue Seisakusho), 250 parts of the pigment, 2500 parts of sodium chloride and 200 parts of diethylene glycol were charged and kneaded for 3 hours. Next, the mixture was poured into 2.5 liters of warm water, stirred at a high speed mixer for about 1 hour while being heated to about 80 ° C. to form a slurry, and then filtered and washed 5 times to repeat sodium chloride and The solvent was removed and a dried pigment was obtained.

(2) Surface treatment step 20 parts of the pigment, 5 parts of the dispersants A and B (in terms of solid content) and water were added to the paint conditioner, and the total amount was 100 parts and dispersed for 3 hours. The obtained aqueous pigment dispersion was centrifuged at 15000 rpm for 6 hours.
To 20 parts of the surface-treated pigment according to Reference Example 5, 0.1 part of 30% ammonia water and 79.9 parts of purified water were added and redispersed with a paint conditioner to prepare a pigment concentrate. For the pigments that were not surface-treated, add 5 parts (solid content) of dispersant A (prescription 1) or dispersant B (formulation 2) and purified water to 20 parts of pigment, and paint in a total amount of 100 parts. The ink was dispersed with a conditioner and purified with a reverse osmosis membrane to prepare a concentrated recording liquid for inkjet. The concentrated solution was filtered through a 1 μm nylon filter, and then filtered through a 0.5 μm polypyropylene filter to obtain a working dispersion. Each content of Fe, Ca, and Si was 100 ppm or less.

The average particle size of the dispersion here is
Yellow dispersion <2>: 93 nm
Yellow dispersion <3>: 80 nm
Magenta dispersion <2>: 60 nm
Magenta dispersion <2>: 56 nm
Cyan dispersion <2>: 90 nm
Cyan dispersion <3>: 87 nm

  In the present invention, fine particles colored with a dye or a pigment are used as a coloring material to improve the fixing property on plain paper and the color developability. By containing the water-soluble calixarene of the above formula (1), aggregation is achieved. It is possible to obtain a colored fine particle recording liquid that is less likely to occur. As the colored fine particles, any of fine particles made of a polymer and those made of inorganic fine particles such as silica and alumina can be used. For the purpose of imparting gloss, it is preferable to use polymer fine particles.

  In particular, it is preferable to use those obtained by impregnating dye or pigment into acrylic or polyester fine particles, that is, colored polymer fine particles in which the dye or pigment is present in the surface layer, inside or entirely. More specifically, colored fine particles produced by the method disclosed in JP-A No. 2000-53898 can be mentioned. One example according to this is shown below.

Reference Example 7
In a sealable reaction vessel equipped with a stirring blade, a cooling pipe, and a nitrogen gas introduction pipe, 20 parts by weight of methyl ethyl ketone as a polymerization solvent and an initial charge monomer and a polymerization chain transfer agent having the following composition as a polymerizable unsaturated monomer were charged, Gas replacement was performed sufficiently.

Methyl methacrylate, monomer 12.8 parts by weight 2-hydroxyethyl methacrylate, monomer 1.2 parts by weight Methacrylic acid, monomer 2.9 parts by weight Silicone macromer (manufactured by Chisso Corporation, FM-0711) 2 parts by weight Styrene acrylic Nitrile macromer (Toa Gosei Co., Ltd., AN-6) 1 part by weight Mercaptoethanol (polymerization chain transfer agent) 0.3 part by weight

  Under a nitrogen atmosphere, the mixture in the reaction vessel was heated to 65 ° C. while stirring. Separately, the following dropping monomer and polymerization chain transfer agent, 60 parts of methyl ethyl ketone, and 0.2 part of 2,2′-azobis (2,4-dimethylvaleronitrile) are mixed and sufficiently substituted with nitrogen. The obtained mixed solution was gradually dropped into the reaction vessel over 3 hours.

Methyl methacrylate, monomer 51 parts by weight 2-hydroxyethyl methacrylate, monomer 4.2 parts by weight Methacrylic acid, monomer 11 parts by weight Silicone macromer (manufactured by Chisso Corporation, FM-0711) 8 parts by weight Styrene acrylonitrile macromer (Toa Synthesizer Co., Ltd., AN-6) 4 parts by weight Mercaptoethanol (polymerization chain transfer agent) 1.2 parts by weight

  Two hours after the completion of the dropping, a solution prepared by dissolving 0.1 part by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) in 5 parts by weight of methyl ethyl ketone was added, and further at 65 ° C. for 2 hours, 70 ° C. For 2 hours to obtain a vinyl polymer solution.

  A part of the obtained vinyl polymer solution was isolated by drying at 105 ° C. for 2 hours under reduced pressure to completely remove the solvent. The weight average molecular weight was about 10,000 and Tg was 180 ° C.

  To 5 g of the vinyl polymer obtained by drying the vinyl polymer solution obtained above under reduced pressure, 25 g of toluene and 5 g of an anthraquinone dye having the following composition are added and completely dissolved, and 2 g of an aqueous sodium hydroxide solution is added to the vinyl polymer. A part of the acidic group of the polymer was neutralized. Subsequently, after adding 300 g of ion-exchange water and stirring, it emulsified for 30 minutes using Nanomaker TM (made by Nanomizer) which is an emulsifier. The obtained emulsion was completely removed by removing toluene at 60 ° C. under reduced pressure, further concentrating by removing a part of water, and removing impurities such as monomers with an ultrafiltration membrane, and purified disperse dye A magenta dispersion <4> of vinyl-based polymer fine particles impregnated with (average particle size: 98 nm, solid content concentration: 10%) was obtained.

  In the same manner, the dye was added to I. Disperse Yellow 118 as Yellow Dispersion 4 (average particle size: 98 nm, solid content concentration: 10%). I. A blue dispersion <4> (average particle size: 98 nm, solid content concentration: 10%) was obtained as Disperse Blue 36.

  In the present invention, wettability to recording paper can be improved by using a surfactant. Preferred surfactants include interfacial polyoxyethylene alkyl ether acetates, dialkyl sulfosuccinates, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene polyoxypropylene block copolymers, and acetylene glycol-based interfaces. An activator is mentioned. More specifically, examples of the anionic surfactant include polyoxyethylene alkyl ether acetate (II) shown below and / or dialkylsulfosuccinic acid (III) having a branched alkyl chain having 5 to 7 carbon chains. ) Improves the properties of plain paper, and further provides colorant dissolution / dispersion stability.

（式中、Ｒは炭素数６〜１４の分岐してもよいアルキル基、Ｍはアルカリ金属イオン、第４級アンモニウム、第４級ホスホニウム、アルカノールアミン、ｍは３〜１２を表わす。）

(In the formula, R represents an alkyl group having 6 to 14 carbon atoms which may be branched, M represents an alkali metal ion, quaternary ammonium, quaternary phosphonium, alkanolamine, and m represents 3 to 12).

（式中、Ｒ₅、Ｒ₆は炭素数５〜７の分岐したアルキル基、Ｍはアルカリ金属イオン、第４級アンモニウム、第４級ホスホニウム、アルカノールアミンを表わす。）

(Wherein R ₅ and R ₆ are branched alkyl groups having 5 to 7 carbon atoms, and M is an alkali metal ion, quaternary ammonium, quaternary phosphonium, or alkanolamine.)

  Further, by using lithium ions, quaternary ammonium and quaternary phosphonium represented by the following general formula as counter ions of the surfactant of the present invention, the surfactant exhibits excellent dissolution stability.

  Preferred nonionic surfactants include those represented by general formula (IV), which is polyoxyethylene alkylphenyl ether, and those represented by general formula (V), which are acetylene glycol surfactants. By using these together, the penetrability is further increased as a synergistic effect, thereby reducing the color boundary bleeding and obtaining an ink with less character bleeding.

（式中、Ｒは分岐しても良い６〜１４の炭素鎖を表わし、ｋは５〜１２を表わす。）

(In the formula, R represents a 6 to 14 carbon chain which may be branched, and k represents 5 to 12).

（式中、ｐ、ｑは０〜４０を表わす。）

(Wherein p and q represent 0 to 40)

By setting the ink pH to 6 or more, the storage stability of the ink can be obtained, and many copy papers and sticky notes used in the office have a pH of 5 to 6, and these recordings are possible. The ink is ejected from a fine ejection opening of 9 to 60 μm on paper, and is ejected as a droplet having a weight of 2 ng to 50 ng at a rate of 5 to 20 m / s, and the adhesion amount in a single color is 1.5 g / m ^{2 to} 30 g / m ^2. As described above, it is possible to provide a recording method for forming a high-quality, high-resolution recording image by recording on a so-called plain paper having a Steecht sizing degree of 3 seconds or more according to the JIS P-8122 test method. However, when the pH is 9 or more, the activator of the formula (III) is likely to change its physical properties due to decomposition during storage. Therefore, when the activator of the formula (III) is used, the pH is preferably 6-9.

  The amount of the activator of formula (II), formula (III), formula (IV), or (V) that can be used in the present invention is required by the printer system between 0.05 to 10% by weight. It is possible to give the desired penetrability to the ink properties. If it is 0.05% or less, bleeding occurs at the boundary between the two-color overlapping portions in any case, and if it is added in an amount of 10% by weight or more, the compound itself may easily precipitate at a low temperature, resulting in poor reliability.

  Next, the surfactants (II) and (III) used in the present invention are specifically shown as free acid types in Table 3 below.

  The ink of the present invention uses water as a liquid medium. In order to make the ink have desired physical properties, to prevent drying of the ink, and to improve the dissolution stability of the compound of the present invention, etc. For the purpose, the following water-soluble organic solvents can be used. For example, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5 pentanediol, 1,6 hexanediol, Polyhydric alcohols such as glycerol, 1,2,6-hexanetriol, 1,2,4-butanetriol, 1,2,3-butanetriol, petriol, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol Monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, propylene glycol monoethyl ether, etc. Polyhydric alcohol aryl ethers such as polyhydric alcohol alkyl ethers, ethylene glycol monophenyl ether, ethylene glycol monobenzyl ether; N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 2-pyrrolidone, 1, Nitrogen-containing heterocyclic compounds such as 3-dimethylimidazolidinone and ε-caprolactam; Amides such as formamide, N-methylformamide, formamide and N, N-dimethylformamide; monoethanolamine, diethanolamine, triethanolamine, monoethylamine Amines such as diethylamine and triethylamine, sulfur-containing compounds such as dimethyl sulfoxide, sulfolane and thiodiethanol, propylene carbonate, ethylene carbonate, and γ-butyrolactone. These solvents are used alone or in combination with water.

Among these, particularly preferred are diethylene glycol, thiodiethanol, polyethylene glycol 200 to 600, triethylene glycol, glycerol, 1,2,6-hexanetriol, 1,2,4-butanetriol, petriol, 1,3. -Butanediol, 2,3-butanediol, 1,4-butanediol, 1,5-pentanediol, N-methyl-2-pyrrolidone, N-hydroxyethylpyrrolidone, 2-pyrrolidone, 1,3-dimethylimidazolide By using these, it is possible to obtain an excellent effect on the high solubility of the compound of the present invention and the prevention of jetting characteristics defects due to water evaporation.
In particular, pyrrolidone derivatives such as N-hydroxyethyl-2-pyrrolidone may be mentioned as a preferable solvent for obtaining the dispersion stability of the colorant in the present invention.

  In addition to the surfactants (II) to (V) of the present invention, penetrants added for the purpose of adjusting the surface tension include diethylene glycol monophenyl ether, ethylene glycol monophenyl ether, ethylene glycol monoallyl ether, diethylene glycol. Alkyl and aryl ethers of polyhydric alcohols such as monophenyl ether, diethylene glycol monobutyl ether, propylene glycol monobutyl ether, triethylene glycol monobutyl ether, tetraethylene glycol chlorophenyl ether, 2-ethyl-1,3-hexanediol, 2,2 Diols such as 1,4-trimethyl-1,3-pentanediol and 2,2-dimethyl-1,3-propanediol, polyoxyethylene polyoxypropylene block Copolymers, fluorine-based surfactants, lower alcohols such as ethanol and 2-propanol can be mentioned, and particularly preferred are diethylene glycol monobutyl ether as polyhydric alcohol alkyl ether and 2-ethyl- as diol having 6 or more carbon atoms. 1,3-hexanediol and 2,2,4-trimethyl-1,3-pentanediol. Diols are preferred because they are less likely to cause aggregation of water-insoluble colorants. The addition amount depends on the kind and desired physical properties, but is 0.1 to 20% by weight, preferably 0.5 to 10% by weight. If it is less than the lower limit, the permeability is insufficient, and if it is more than the upper limit, the particle formation characteristics are adversely affected. Further, the addition of these improves the wettability to the ink jet head member and the recording device, improves the filling property, and makes it difficult to cause recording defects due to bubbles.

  The ink physical properties in the present invention can be appropriately adjusted by the system. Here, the surface tension of the ink is an index indicating the permeability to paper, and the measurement of the dynamic surface tension in a short time of 1 second or less after the surface is formed corresponds to the permeability of the ink. Different from static surface tension measured at saturation time. As a measuring method, any method can be used as long as it can measure a dynamic surface tension of 1 second or less by a conventionally known method described in JP-A-63-131237. The value of the surface tension is preferably 50 mN / m or less, more preferably 40 mN / m or less, whereby excellent drying properties can be obtained. On the other hand, from the viewpoint of ink ejection stability, if the dynamic surface tension is too low, the particle formation tends to be unstable. The dynamic surface tension that can be stably discharged is preferably 40 mN / m or more in 1 msec.

  The viscosity range is appropriately selected from 1 mPa · s to 10 mPa · s depending on the discharge method.

  The pigment particle diameter range in the ink is preferably 10 nm to 300 nm, and the average particle diameter is preferably 60 nm to 120 nm. The solid content in the ink is 1 to 25% by weight, and the water content is in the range of 25 to 93% by weight, more preferably in the range of 50 to 80% by weight.

  In the present invention, when the electric conductivity range does not impair dispersion stability due to the relationship between the pigment ink in the ink and the ζ potential of the particle surface of the colored fine particle ink, the aggregation of the pigment and the like is within the range of 1 mS / cm to 6 mS / cm. Therefore, it is possible to obtain a highly reliable ink with little change in particle diameter over a long period of time. In order to make this range, a conductivity adjusting agent or the like is usually added, but the compound of the formula (1) also has a dissociation group, and the content is adjusted to adjust to a desired range. It is possible. Further, a conductivity adjusting agent that does not inhibit dispersion can be added for fine adjustment. Preferred conductivity adjusting agents include quaternary ammonium salts such as tetramethylammonium chloride, alkanolamine salts and the like.

  In addition to the colorant and solvent, conventionally known additives can be added to the ink of the present invention. For example, as a preservative and antifungal agent, sodium dehydroacetate, sodium sorbate, sodium 2-pyridinethiol-1-oxide, sodium benzoate, sodium pentachlorophenol, isothiazoline and the like can be used in the present invention.

As the pH adjuster, any substance can be used as long as the pH can be adjusted to 7 or more without adversely affecting the ink to be prepared.
Specific examples include amines such as diethanolamine and triethanolamine, hydroxides of alkali metal elements such as lithium hydroxide, sodium hydroxide, and potassium hydroxide, ammonium hydroxide, quaternary ammonium hydroxide, and quaternary. Examples thereof include alkali metal carbonates such as phosphonium hydroxide, lithium carbonate, sodium carbonate, and potassium carbonate.

  Examples of the chelating reagent include sodium ethylenediaminetetraacetate, sodium nitrilotriacetate, sodium hydroxyethylethylenediaminetriacetate, sodium diethylenetriaminepentaacetate, sodium uramil diacetate, and the like.

  Examples of the rust inhibitor include acidic sulfite, sodium thiosulfate, ammonium thiodiglycolate, diisopropyl ammonium nitrite, pentaerythritol tetranitrate, dicyclohexyl ammonium nitrite and the like.

  In addition, a water-soluble ultraviolet absorber and a water-soluble infrared absorber can be added depending on the purpose.

Next, an example of the ink jet recording apparatus of the present invention suitable for recording using the above-described aqueous pigment ink of the present invention will be described below.
First, an example of a head configuration which is a main part of an ink jet recording apparatus using thermal energy is shown in FIG. FIG. 1 is a cross-sectional view of a head (13) along an ink flow path. The head (13) is a glass, ceramic, silicon or plastic plate having a flow path (nozzle) (14) through which ink passes and a heating element. It is obtained by bonding the substrate (15). The heating element substrate (15) includes a protective layer (16) formed of silicon oxide, silicon nitride, silicon carbide or the like, electrodes (17-1) and (17-2) formed of aluminum, gold, aluminum-copper alloy, or the like. ), A heating resistor layer (18) formed from a high melting point material such as HfB ₂ , TaN, TaAl, a heat storage layer (19) formed from thermal silicon oxide, aluminum oxide, etc., silicon, aluminum, aluminum nitride, etc. It consists of the board | substrate (20) formed with a material with good heat dissipation.

  When pulsed electrical signals are applied to the electrodes (17-1) and (17-2) of the head (13), the region indicated by n of the heating element substrate (15) rapidly generates heat, and this surface Bubbles are generated in the ink (21) in contact with the ink, the meniscus (23) protrudes by the pressure, the ink (21) is ejected through the nozzle (14) of the head, and the ink droplet (24) is ejected from the ejection orifice (22). ) And fly toward the recording material (25).

  FIG. 2 shows an example of an ink jet recording apparatus incorporating this head. In FIG. 2, reference numeral 61 denotes a blade as a wiping member, one end of which is held and fixed by a blade holding member, and forms a cantilever. The blade (61) is disposed at a position adjacent to the recording area by the recording head (65), and in this example, is held in a form protruding in the moving path of the recording head (65).

  Reference numeral (62) denotes a cap on the protruding port surface of the recording head (65), which is disposed at a home position adjacent to the blade (61) and moves in a direction perpendicular to the moving direction of the recording head (65) to discharge ink. It has a configuration that abuts the exit surface and performs capping. Further, (63) is an ink absorber provided adjacent to the blade (61), and is held in a form protruding in the moving path of the recording head (65), like the blade (61). The blade (61), the cap (62) and the ink absorber (63) constitute a discharge recovery portion (64), and the blade (61) and the ink absorber (63) remove moisture, dust, and the like from the discharge port surface. Is done.

  (65) has a discharge energy generating means, and a recording head for recording by discharging ink onto a recording material facing the discharge port surface provided with the discharge ports; (66) has a recording head (65) mounted thereon; And a carriage for moving the recording head (65). The carriage (66) is slidably engaged with the guide shaft (67), and a part of the carriage (66) is connected to a belt (69) driven by a motor (68) (not shown). . Accordingly, the carriage (66) can be moved along the guide shaft (67), and the recording area and its adjacent area can be moved by the recording head (65).

  (51) is a paper feeding section for inserting a recording material, and (52) is a paper feed roller driven by a motor (not shown). With these configurations, a recording material is fed to a position facing the (65) discharge port surface of the recording head, and is discharged to a paper discharge portion provided with a paper discharge roller (53) as recording progresses. In the above configuration, when the recording head (65) finishes recording and returns to the home position, the cap (62) of the ejection recovery section (64) is retracted from the moving path of the recording head (65), but the blade (61 ) Protrudes in the movement path. As a result, the ejection port of the recording head (65) is wiped.

  When the cap (62) is in contact with the ejection surface of the recording head (65) for capping, the cap (62) moves so as to protrude into the moving path of the recording head. When the recording head (65) moves from the home position to the recording start position, the cap (62) and the blade (61) are in the same position as the above-described wiping position. As a result, the ejection port surface of the recording head (65) is wiped even during this movement. The above-mentioned movement of the recording head to the home position is not only at the end of recording or at the time of ejection recovery, but also to the home position adjacent to the recording area at a predetermined interval while the recording head moves the recording area for recording. Then, the wiping is performed with this movement.

  FIG. 3 is a diagram illustrating an example of an ink cartridge that contains ink supplied to the recording head via an ink supply member, for example, a tube. Here, reference numeral (40) denotes an ink storage portion, for example, an ink bag, in which supply ink is stored, and a rubber stopper (42) is provided at the tip thereof. By inserting a needle (not shown) into the stopper (42), the ink in the ink bag (40) can be supplied to the head. (44) is an ink absorber for receiving waste ink. The ink container preferably has a liquid contact surface made of polyolefin, particularly polyethylene.

  The ink jet recording apparatus used in the present invention is not limited to the one in which the head and the ink cartridge are separated as described above, but is also suitably used in an apparatus in which they are integrated as shown in FIG. It is done. In FIG. 4, reference numeral (70) denotes a recording unit, in which an ink storage portion storing ink, for example, an ink absorber is stored, and a head portion in which the ink in the ink absorber has a plurality of orifices. (71) is ejected as droplets. As the material of the ink absorber, it is preferable for the present invention to use polyurethane, cellulose, polyvinyl acetate, or polyolefin resin. Alternatively, a structure in which the ink container is an ink bag with a spring or the like inside without using an ink absorber may be used. (72) is an atmosphere communication port for communicating the inside of the cartridge with the atmosphere. The recording unit (70) is used in place of the recording head (65) shown in FIG. 2, and is detachable from the carriage (66).

  Next, as a preferable example of an ink jet recording apparatus using mechanical energy, a nozzle forming substrate having a plurality of nozzles, a pressure generating element made of a piezoelectric material and a conductive material disposed opposite to the nozzles, and the pressure An on-demand ink jet recording apparatus that includes ink that fills the periphery of the generating element, displaces the pressure generating element by an applied voltage, and discharges a small droplet of ink from a nozzle can be exemplified. An example of the configuration of a recording head, which is the main part of the recording apparatus, is shown in FIG.

  The head includes an ink flow path (80) communicating with an ink chamber (not shown), an orifice plate (81) for ejecting ink droplets of a desired volume, and a vibration plate (82) for directly applying pressure to ink. And a piezoelectric element (83) joined to the diaphragm (82) and displaced by an electric signal, and a substrate (84) for supporting and fixing the orifice plate (81), the diaphragm (82), and the like. ing.

  In FIG. 5, the ink flow path (80) is formed of a photosensitive resin or the like, and the orifice plate (81) has a discharge port (85) formed by drilling a metal such as stainless steel or nickel by electroforming or pressing. In addition, an ink repellent layer such as eutectoid plating of PTFE nickel is provided on the surface. The diaphragm (82) is formed of a metal film such as stainless steel, nickel, or titanium and a highly elastic resin film, and the piezoelectric element (83) is formed of a dielectric material such as barium titanate or PZT. The recording head configured as described above applies a pulse-like voltage to the piezoelectric element (83), generates a strain stress, and deforms the vibration plate bonded to the piezoelectric element (83), whereby the ink flow path. The ink in (80) is vertically pressurized and ink droplets (not shown) are ejected from the ejection port (85) of the orifice plate (81) to perform recording. Such a recording head is used by being incorporated in an ink jet recording apparatus similar to that shown in FIG. The detailed operation of the ink jet recording apparatus can be performed in the same manner as described above.

  Next, ink jet using an electrostatic actuator is shown as a preferred example of an ink jet recording apparatus using other mechanical energy. FIG. 6 is a cross-sectional view of an ink jet head to which the present invention is applied. As shown in FIG. 6, the ink jet head (1) has a silicon substrate (2) sandwiched between the nozzle plate (3) made of silicon, It has a three-layer structure in which a borosilicate glass substrate (4) having a thermal expansion coefficient close to that of silicon is laminated on the lower side. The central silicon substrate (2) includes a plurality of independent ink chambers (5), a common ink chamber (6) provided in common to the plurality of ink chambers (5), and the common ink chamber (6). Grooves that respectively function as ink supply paths (7) connected to the surface are formed by etching from the surface (upper surface in the figure). These grooves are closed by the nozzle plate (3), and the portions (5), (6), and (7) are partitioned.

  In the nozzle plate (3), ink nozzles (11) are formed at positions corresponding to the tip side portions of the respective ink chambers (5), and these communicate with the respective ink chambers (5). The nozzle plate (3) has an ink supply port communicating with the common ink chamber (6). Ink is supplied from an external ink tank (not shown) to the common ink chamber (6) through the ink supply port. The ink supplied to the common ink chamber (6) is supplied to the ink chambers (5) independent from each other through the ink supply path (7).

  The ink chamber (5) is formed thin so that its bottom wall (8) functions as a diaphragm that can be elastically displaced in the vertical direction of FIG. Therefore, the portion of the bottom wall (8) is sometimes referred to as a diaphragm (8) for the convenience of the following description.

  Next, in the glass substrate (4) in contact with the lower surface of the silicon substrate (2), each ink chamber (5) of the silicon substrate (2) is provided on the upper surface, that is, the bonding surface with the silicon substrate (2). A shallowly etched recess (9) is formed at a position corresponding to. Accordingly, the bottom wall (8) of each ink chamber (5) faces the surface (92) of the recess (9) of the glass substrate (4) with a very small gap. Since the concave portion (9) of the glass substrate (4) faces the bottom wall (8) of the ink chamber (5), it is referred to as a diaphragm facing wall or simply a facing wall (91).

  Here, the bottom wall (8) of each ink chamber (5) functions as an electrode for storing electric charges. A segment electrode (10) is formed on the concave surface (92) of the glass substrate (4) so as to face the bottom wall (8) of each ink chamber (5). The surface of each segment electrode (10) is covered with an insulating layer (G0) made of inorganic glass. Thus, the segment electrode (10) and each ink chamber bottom wall (8) form a counter electrode (distance between electrodes is G) with the insulating layer (15) interposed therebetween.

Examples of the present invention and comparative examples are shown below.
Reference example 1
The following composition was mixed and allowed to stand for 1 day, then the pH of the compound of Example (I-1) was adjusted to 9 and filtered through a 0.5 μm polypropylene filter to obtain black ink [1].
Carbon dispersion <1> 5% by weight as solid content concentration in ink
In the formula (1), n = 4 compound 1.5% by weight
0.1% by weight of compound of specific example (I-1)
Glycerol 15% by weight
5% by weight of N-hydroxyethylpyrrolidone
2-ethyl-1,3-hexanediol 1% by weight
Activator of specific example (II-2) 1% by weight
Sodium dehydroacetate 0.2% by weight
High purity water (10 MΩ) The concentration of the dispersion and the dye below the remaining amount is the concentration of the color material solids in the ink.

Reference example 2
A black ink [2] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and adjusted to pH 8.8 with lithium hydroxide.
Carbon dispersion <2> 4% by weight
In the formula (1), n = 6 compound 1.2% by weight
1,2,6-hexanetriol 8% by weight
1,5-pentanediol 8% by weight
2-pyrrolidone 8% by weight
Activator of specific example (II-3) 1.0% by weight
Active agent of specific example (III-1) 1.2% by weight
Specific example (I-3) 25% aqueous solution 0.8% by weight
Urea 5% by weight
2-pyridinethiol-1-oxide sodium 0.2% by weight
High purity water (10MΩ)

Reference example 3
A black ink [3] was prepared by adjusting the pH to 8.5 with lithium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Carbon dispersion <3> 4.5% by weight
In formula (1), n = 8 compound 1% by weight
Diethylene glycol 5% by weight
Glycerol 5% by weight
2-pyrrolidone 2% by weight
Styrene acrylic acid polymer 0.5% by weight
Activator of specific example (II-2) 1% by weight
Activator of specific example (IV) (R: C ₉ H ₁₉ , k: 12) 1% by weight
Specific Example (I-3) 25% aqueous solution 0.2% by weight
Sodium dehydroacetate 0.2% by weight
Ion exchange water

Reference example 4
A yellow ink [1] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and the pH was adjusted to 9.5 with lithium hydroxide.
Yellow dispersion <1> 1.0% by weight
In the formula (1), n = 6 compound 1.2% by weight
Ethylene glycol 5% by weight
Glycerol 2% by weight
1,5-pentanediol 8% by weight
2-pyrrolidone 2% by weight
1% by weight of polyoxyethylene polyoxyethylene block copolymer
Activator of specific example (II-4) 1% by weight
Activator of specific example (V) (p, q = 20) 0.8% by weight
Specific example (I-4) 25% aqueous solution 2% by weight
Urea 5% by weight
Sodium benzoate 0.2% by weight
Ion exchange water

Magenta ink [1] was prepared by adjusting the pH to 9.1 with lithium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Magenta dispersion <1> 1.0% by weight
In the formula (1), n = 6 compound 1.2% by weight
Ethylene glycol 5% by weight
Glycerol 15% by weight
2-pyrrolidone 2% by weight
1% by weight of polyoxyethylene polyoxyethylene block copolymer
Activator of specific example (II-4) 1% by weight
Activator of specific example (V) (p, q = 20) 0.8% by weight
Specific example (I-4) 25% aqueous solution 2% by weight
Urea 5% by weight
Sodium benzoate 0.2% by weight
Ion exchange water

A cyan ink [1] was prepared by adjusting the pH to 9.1 with lithium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Cyan dispersion <1> 5% by weight
In formula (1), n = 6 compound 1.5% by weight
0.1% by weight of compound of specific example (I-1)
Glycerol 15% by weight
5% by weight of N-hydroxyethylpyrrolidone
2-ethyl-1,3-hexanediol 1% by weight
Activator of specific example (II-2) 1% by weight
Sodium dehydroacetate 0.2% by weight
High purity water (10MΩ)

Reference Example 5
A yellow ink [2] was prepared by adjusting the pH to 7.8 with sodium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Yellow dispersion <2> 3% by weight
In formula (1), n = 8 compound 1% by weight
Triethylene glycol 5% by weight
Petriol 10% by weight
N-methyl-2-pyrrolidone 5% by weight
Diethylene glycol monobutyl ether 2% by weight
Compound of specific example (I-5) 0.4% by weight
Specific example (IV) activator (R: C ₁₀ H ₂₁ , K: 7) 1% by weight
Specific example (I-2) 25% aqueous solution 1.5% by weight
Hydroxyethylurea 5% by weight
2-pyridinethiol-1-oxide sodium 0.2% by weight
Ion exchange water

Magenta ink [2] was prepared by adjusting the pH to 7.8 with sodium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Magenta dispersion <2> 3% by weight
In formula (1), n = 8 compound 1% by weight
Triethylene glycol 5% by weight
Petriol 10% by weight
N-methyl-2-pyrrolidone 5% by weight
Diethylene glycol monobutyl ether 2% by weight
Compound of specific example (I-5) 0.4% by weight
Activator of specific example (IV) (R: C ₁₀ H ₂₁ , K: 7) 1% by weight
Specific example (I-2) 25% aqueous solution 1.5% by weight
Hydroxyethylurea 5% by weight
2-pyridinethiol-1-oxide sodium 0.2% by weight
Ion exchange water

A cyan ink [2] was prepared by adjusting the pH to 7.8 with sodium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Cyan dispersion <2> 4% by weight
In formula (1), n = 8 compound 1% by weight
Triethylene glycol 5% by weight
Petriol 10% by weight
N-methyl-2-pyrrolidone 5% by weight
Diethylene glycol monobutyl ether 2% by weight
1% by weight of compound of specific example (I-5)
Activator of specific example (V) (R: C ₁₀ H ₂₁ , K: 7) 1% by weight
Specific example (I-2) 25% aqueous solution 1.5% by weight
Hydroxyethylurea 5% by weight
2-pyridinethiol-1-oxide sodium 0.2% by weight
Ion exchange water

Reference Example 6
A yellow ink [3] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and the pH was adjusted to 8 with lithium hydroxide.
Yellow dispersion <3> 4% by weight
In formula (1), n = 6 compound 1% by weight
2-pyrrolidone 8% by weight
Glycerol 7% by weight
1,3-butanediol 3% by weight
Activator of specific example (II-1) 0.3% by weight
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (IV) (p + q = 0) 0.5% by weight
Specific example (I-7) 25% aqueous solution 2% by weight
Hydroxyethylurea 5% by weight
Sodium dehydroacetate 0.2% by weight
Ion exchange water

Magenta ink [3] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and the pH was adjusted to 8 with lithium hydroxide.
Magenta dispersion <3> 4% by weight
In formula (1), n = 6 compound 3% by weight
2-pyrrolidone 8% by weight
Glycerol 7% by weight
1,3-butanediol 3% by weight
Active agent of specific example (I-1) 0.3% by weight
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (IV) (p + q = 0) 0.5% by weight
Specific example (I-7) 25% aqueous solution 2% by weight
Hydroxyethylurea 5% by weight
Sodium dehydroacetate 0.2% by weight
Ion exchange water

A cyan ink [3] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and the pH was adjusted to 8 with lithium hydroxide.
Cyan dispersion <3> 4% by weight
In formula (1), n = 6 compound 2% by weight
2-pyrrolidone 8% by weight
Glycerol 7% by weight
1,3-butanediol 3% by weight
Activator of specific example (II-1) 0.3% by weight
Tetramethylammonium nitrate (conductivity adjusting agent) 0.4% by weight
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (IV) (p + q = 0) 0.5% by weight
Specific example (I-7) 25% aqueous solution 2% by weight
Hydroxyethylurea 5% by weight
Sodium dehydroacetate 0.2% by weight
Ion exchange water

Reference Example 7
A yellow ink [4] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and the pH was adjusted to 9.5 with lithium hydroxide.
Yellow dispersion <4> 1.0% by weight
In the formula (1), n = 8 compound 1.2% by weight
Ethylene glycol 5% by weight
Glycerol 2% by weight
1,3-propanediol 8% by weight
2-pyrrolidone 2% by weight
1% by weight of polyoxyethylene polyoxyethylene block copolymer
Activator of specific example (II-4) 0.5% by weight
Specific example (I-4) 25% aqueous solution 2% by weight
Urea 5% by weight
Sodium benzoate 0.2% by weight
Ion exchange water

Magenta ink [4] was prepared by adjusting the pH to 9.1 with lithium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Magenta dispersion <4> 1.0% by weight
In the formula (1), n = 6 compound 1.2% by weight
Ethylene glycol 5% by weight
Glycerol 15% by weight
2-pyrrolidone 2% by weight
1% by weight of polyoxyethylene polyoxyethylene block copolymer
Active agent of specific example (II-4) 0.3% by weight
Activator of specific example (V) (p, q = 20) 0.2% by weight
Specific example (I-4) 25% aqueous solution 2% by weight
Urea 5% by weight
Sodium benzoate 0.2% by weight
Ion exchange water

A cyan ink [4] was prepared by adjusting the pH to 8.4 with lithium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Cyan dispersion <4> 5% by weight
In formula (1), n = 6 compound 1.5% by weight
0.1% by weight of compound of specific example (I-1)
Glycerol 15% by weight
5% by weight of N-hydroxyethylpyrrolidone
2-ethyl-1,3-hexanediol 1% by weight
Activator of specific example (II-2) 1% by weight
Sodium dehydroacetate 0.2% by weight
High purity water (10MΩ)

Example 1
A yellow ink [5] was prepared by adjusting the pH to 7.8 with sodium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Dye of specific example (Y1) 1% by weight
Dye of specific example (Y2) 1% by weight
In formula (1), n = 8 compound 1% by weight
Magnesium nitrate 6% by weight
1,5-pentanediol 5% by weight
7% by weight of trimethylolpropane
2-pyrrolidone 5% by weight
Diethylene glycol monobutyl ether 2% by weight
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Specific example (IV) activator (R: C ₁₀ H ₂₁ , K: 7) 1% by weight
Specific example (I-2) 25% aqueous solution 1.5% by weight
Hydroxyethylurea 2% by weight
2-pyridinethiol-1-oxide sodium 0.2% by weight
Ion exchange water

Magenta ink [5] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and the pH was adjusted to 7.8 with lithium hydroxide.
Dye of specific example (M5) 1.5% by weight
C. I. Acid Red 52 0.5% by weight
In formula (1), n = 8 compound 1% by weight
Calcium nitrate 6% by weight
1,5-pentanediol 5% by weight
7% by weight of trimethylolpropane
2-pyrrolidone 5% by weight
Diethylene glycol monobutyl ether 2% by weight
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (V) (R: C ₁₀ H ₂₁ , K: 7) 1% by weight
Specific example (I-2) 25% aqueous solution 1.5% by weight
Hydroxyethylurea 5% by weight
2-pyridinethiol-1-oxide sodium 0.2% by weight
Ion exchange water

A cyan ink [5] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and the pH was adjusted to 8 with lithium hydroxide.
Dye of specific example (C1) 1% by weight
Dye of specific example (C2) 2% by weight
Acid Blue 9 0.5% by weight
In formula (1), n = 8 compound 1% by weight
Calcium nitrate 6% by weight
Triethylene glycol 5% by weight
7% by weight of trimethylolpropane
2-pyrrolidone 5% by weight
Diethylene glycol monobutyl ether 2% by weight
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (IV) (R: C ₁₀ H ₂₁ , K: 7) 1% by weight
Specific example (I-2) 25% aqueous solution 1.5% by weight
1% by weight of hydroxyethylurea
2-pyridinethiol-1-oxide sodium 0.2% by weight
Ion exchange water

A black ink [4] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and the pH was adjusted to 8 with lithium hydroxide.
Dye of specific example (BK1) 4% by weight
Dye of specific example (Y4) 2% by weight
In formula (1), n = 8 compound 1% by weight
Calcium nitrate 6% by weight
Triethylene glycol 5% by weight
7% by weight of trimethylolpropane
2-pyrrolidone 5% by weight
Diethylene glycol monobutyl ether 2% by weight
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (V) (R: C ₁₀ H ₂₁ , K: 7) 1% by weight
Specific example (I-2) 25% aqueous solution 1.5% by weight
1% by weight of hydroxyethylurea
2-pyridinethiol-1-oxide sodium 0.2% by weight
Ion exchange water

Example 2
A yellow ink [6] was prepared by adjusting the pH to 9.5 with lithium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Dye of specific example (Y4) 1% by weight
Dye of specific example (Y5) 1% by weight
In formula (1), n = 6 compound 1% by weight
Magnesium nitrate 2% by weight
2-pyrrolidone 8% by weight
Glycerol 7% by weight
10% by weight of triethylene glycol monobutyl ether
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (IV) (p + q = 0) 0.5% by weight
Specific example (I-7) 25% aqueous solution 2% by weight
Urea 2% by weight
Sodium dehydroacetate 0.2% by weight
Ion exchange water

Magenta ink [6] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and the pH was adjusted to 9.5 with lithium hydroxide.
Dye of specific example (M1) 2% by weight
Dye of specific example (M2) 1% by weight
In formula (1), n = 6 compound 3% by weight
Lanthanum nitrate 2% by weight
2-pyrrolidone 8% by weight
Glycerol 7% by weight
3% by weight of triethylene glycol monobutyl ether
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (IV) (p + q = 0) 0.5% by weight
Specific example (I-7) 25% aqueous solution 2% by weight
Hydroxyethylurea 5% by weight
Sodium dehydroacetate 0.2% by weight
Ion exchange water

A cyan ink [6] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and the pH was adjusted to 9.5 with lithium hydroxide.
Dye of specific example (C2) 2% by weight
Dye of specific example (C3) 1% by weight
In formula (1), n = 6 compound 3% by weight
Lanthanum nitrate 2% by weight
2-pyrrolidone 8% by weight
Glycerol 7% by weight
3% by weight of triethylene glycol monobutyl ether
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (IV) (p + q = 0) 0.5% by weight
Specific example (I-7) 25% aqueous solution 2% by weight
Hydroxyethylurea 5% by weight
Sodium dehydroacetate 0.2% by weight
Ion exchange water

Example 3
A yellow ink [7] was prepared in the same manner as in Reference Example 1 except that the following composition was used, and the pH was adjusted to 9.5 with lithium hydroxide.
Dye of specific example (Y7) 1% by weight
Dye of specific example (Y6) 0.5% by weight
C. I. Acid Yellow 17 1% by weight
In formula (1), n = 6 compound 1% by weight
Magnesium nitrate 2% by weight
2-pyrrolidone 8% by weight
Glycerol 7% by weight
10% by weight of triethylene glycol monobutyl ether
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (IV) (p + q = 0) 0.5% by weight
Specific example (I-7) 25% aqueous solution 2% by weight
Urea 2% by weight
Sodium dehydroacetate 0.2% by weight
Ion exchange water

Magenta ink [7] was prepared by adjusting the pH to 9.5 with lithium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Dye of specific example (M1) 2% by weight
Dye of specific example (M2) 1% by weight
In formula (1), n = 6 compound 3% by weight
Lanthanum nitrate 2% by weight
2-pyrrolidone 8% by weight
Glycerol 7% by weight
3% by weight of triethylene glycol monobutyl ether
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (IV) (p + q = 0) 0.5% by weight
Specific example (I-7) 25% aqueous solution 2% by weight
Hydroxyethylurea 5% by weight
Sodium dehydroacetate 0.2% by weight
Ion exchange water

A cyan ink [7] was prepared by adjusting the pH to 9.5 with lithium hydroxide in the same manner as in Reference Example 1 except that the following composition was used.
Dye of specific example (C3) 3% by weight
Dye of specific example (C2) 1% by weight
In formula (1), n = 6 compound 2% by weight
1% calcium nitrate
2-pyrrolidone 8% by weight
Glycerol 7% by weight
1,3-butanediol 3% by weight
1% by weight of active agent of specific example (I-1)
Activator of specific example (IV) (p + q = 15) 0.5% by weight
Activator of specific example (IV) (p + q = 0) 0.5% by weight
Specific example (I-7) 25% aqueous solution 2% by weight
Hydroxyethylurea 5% by weight
Sodium dehydroacetate 0.2% by weight
Ion exchange water

Comparative Example 1
A black ink [5] was prepared in the same manner as in Reference Example 1 except that the compound of n = 4 in formula (1) was omitted.

Comparative Example 2
A black ink [6] was prepared in the same manner as in Reference Example 2 except that the compound of formula (1) was omitted.

Comparative Example 3
A black ink [7] was prepared in the same manner as in Reference Example 3 except that the compound of formula (1) was changed to p-toluenesulfonamide.

Comparative Example 4
In Reference Example 4, a yellow ink [8] was prepared in the same manner except that the compound of formula (1) in the yellow ink [1] was removed. A magenta ink [8] was prepared in the same manner except that the compound of the formula (1) in the magenta ink [1] was removed. Similarly, cyan ink [8] was similarly obtained except that the formula (1) in cyan ink [1] was omitted.

Comparative Example 5
A yellow ink [9] was prepared in the same manner except that the compound of formula (1) in the yellow ink [2] of Reference Example 5 was omitted. Similarly, a magenta ink [9] was prepared in the same manner except that the compound of the formula (1) in the magenta ink [2] was removed. Similarly, cyan ink [9] was obtained in the same manner except that the compound of formula (1) in cyan ink [2] was removed.

Comparative Example 6
A yellow ink [10] was prepared in the same manner except that the compound of formula (1) in the yellow ink [3] of Reference Example 6 was omitted. Similarly, a magenta ink [10] was prepared in the same manner except that the compound of the formula (1) in the magenta ink [3] was removed. Similarly, cyan ink [10] was obtained in the same manner except that the compound of formula (1) in cyan ink [3] was removed.

Comparative Example 7
A yellow ink [11] was prepared in the same manner except that the compound of formula (1) in the yellow ink [4] of Reference Example 7 was omitted. Similarly, magenta ink [11] was obtained in the same manner except that the compound of formula (1) in magenta ink [4] was removed. Similarly, cyan ink [11] was similarly obtained except that the compound of formula (1) in cyan ink [4] was removed.

Comparative Example 8
A yellow ink [12] was prepared in the same manner except that the compound of formula (1) in the yellow ink [5] of Example 1 was omitted. Similarly, magenta ink [12] was obtained in the same manner except that the compound of formula (1) in magenta ink [5] was removed. Similarly, cyan ink [12] was obtained in the same manner except that the compound of formula (1) in cyan ink [5] was removed. Similarly, a black ink [8] was obtained in the same manner except that the compound of formula (1) and diethylene glycol monobutyl ether in the black ink [4] were removed.

Comparative Example 9
Yellow ink [13] was obtained in the same manner except that the compound of formula (1) in yellow ink [6] of Example 2 was replaced with β-cyclodextrin. Similarly, magenta ink [13] was similarly used except that the compound of formula (1) in magenta ink [6] was replaced with 2-hydroxy-4-methoxybenzophenone. Similarly, cyan ink [13] was obtained in the same manner except that the compound of formula (1) in cyan ink [6] was replaced with a cyclodextrin polymer.

Comparative Example 10
A yellow ink [14] was obtained in the same manner except that the compound of formula (1) was omitted from the yellow ink [7] of Example 3. Similarly, magenta ink [14] was obtained in the same manner except that the compound of formula (1) in magenta ink [7] was removed. Similarly, cyan ink [14] was obtained in the same manner except that the compound of formula (1) in cyan ink [7] was removed.

Next, the following tests were conducted as a four-color ink set using the inks of Examples 1 to 3, Reference Examples 1 to 7, and Comparative Examples 1 to 10.
(1) Sharpness of image Thermal inkjet type nozzle diameter of 18 μm, inkjet printer having 300 nozzles with 600 dpi pitch, and 300 nozzles with each nozzle diameter of 28 μm and 200 dpi pitch using laminated PZT for pressurization of liquid chamber flow path Printing is performed with an inkjet printer having 300 nozzles for each color using an electrostatic actuator for pressurizing the liquid chamber flow path, and the blur of the boundary between the two-color overlap, image blur, color tone, and density are integrated by visual observation. Judgment. In addition, color development during OHP projection was also evaluated.
The evaluation criteria are printed paper, commercially available recycled paper, high-quality paper and bond paper, glossy film with an absorption layer of water-soluble resin layer, OHP sheet paper bleed at the border of two color overlap, sharpness, color reproduction The case where the property is high is indicated by ◯, the case where the color boundary blur is small but the secondary color unevenness is observed depending on the paper type is indicated by Δ, and the case where the color boundary blur occurs depending on the paper type is indicated by X.

(2) Water resistance of the image The image sample was immersed in water at 30 ° C. for 1 minute, the change in the image density before and after the treatment was measured with X-Rite 938, and the water resistance (color resistance%) was determined by the following formula. Asked.

いずれの紙でも２０％以下となったものを○、３０％未満を△、３０％以上×とした。

In all the papers, those that were 20% or less were rated as “◯”, those that were less than 30% as “Δ”, and 30% or more as “X”.

(3) Light resistance of the image The image sample was exposed with a xenon weatherometer Ci35W (manufactured by Atlas Co., Ltd.) using a borosiri / borosiri filter at a black panel temperature of 63 ° C., a relative humidity of 50%, and 0.35 W / m ² . The test was conducted, and the fading state after 28 hours was determined by color difference using X-Rite 938. A case where ΔE is less than 6 for each color is indicated as “◯”, a case where each color is less than 15 is indicated as “Δ”, and a case where the ΔE is higher than this is indicated as “X”.

(4) Dryability of image The filter paper was pressed against the image after printing under certain conditions, and the time until the ink was not transferred to the filter paper was measured.
When any paper was dried within 10 seconds, it was judged as “good”. More than that was marked with x.

(5) Storage stability Each ink is put in a polyethylene container and stored at −20 ° C., 5 ° C., 20 ° C., and 70 ° C. for 3 months, and after storage, surface tension, viscosity, and precipitate precipitation, The presence or absence of a change in particle diameter was examined. Even if it preserve | saved on what conditions, the thing which does not change a physical property etc. was set as (circle).

(6) Reliability when printing is stopped Using a printer with a head driven by PZT having a nozzle diameter of 30 μm and 128 nozzles, it is possible to recover from printing or pausing without performing caps, cleaning, etc. The table shows the results of evaluating the reliability according to how long the ejection direction shifts or the weight of the ejected droplet changes. In particular, “O” indicates no problem, “small change in drop weight”, “small squirt” indicates Δ, and “x” indicates significant clogging.

It is sectional drawing of the inkjet head to which this invention is applied. It is the figure which showed an example of the inkjet recording device incorporating the head of FIG. It is a figure which shows an example of the ink cartridge which accommodated the ink supplied via a tube. 1 is a diagram showing an ink jet recording apparatus in which a head and an ink cartridge used in the present invention are integrated. FIG. FIG. 2 is a diagram illustrating an example of a configuration of a recording head in the present invention. It is sectional drawing of the inkjet head to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet head 2 Silicon substrate 3 Nozzle plate 4 Glass substrate 5 Ink chamber 6 Common ink chamber 7 Ink supply path 8 Tire clam 8a Thin portion 8b Bottom wall 9 Recess 10 Segment electrode 11 Ink nozzle 12 Insulating layer 13 Head 14 Channel (nozzle )
15 Heating element substrate 16 Protective layer 17-1 Electrode 17-2 Electrode 18 Heating resistor layer 19 Heat storage layer 20 Substrate 21 Ink 22 Discharge orifice 23 Meniscus 24 Ink droplet 25 Recording material 40 Ink container (ink bag)
42 Plug 44 Ink absorber 45 Cartridge case 51 Paper supply unit 52 Paper feed roller 53 Paper discharge roller 61 Blade 62 Cap 63 Ink absorber 64 Discharge recovery unit 65 Recording head 66 Carriage 67 Guide shaft 68 Motor 69 Belt 70 Recording unit 71 Head Part 72 communication port 80 ink flow path 81 orifice plate 82 diaphragm 83 piezoelectric element 84 substrate 85 discharge port 91 opposing wall 92 surface of recess

Claims (1)

An ink jet recording apparatus comprising a recording liquid storage unit for storing a recording liquid, or a recording liquid cartridge, a head unit for dropping and discharging the recording liquid by the action of thermal energy or mechanical energy, or a recording unit, The recording liquid contains a coloring material, an organic solvent in which the coloring material is dispersed or dissolved, water, a polyvalent metal ion source compound, and a cyclic compound represented by the following formula (1) or a salt thereof, and the cyclic structure under an alkali. A recording apparatus using a recording liquid in which a compound and the polyvalent metal ion form a phenolate complex.

(In the formula, x represents 4 to 8.)

Images