JP2019172959A - Aqueous ink jet composition - Google Patents

Abstract

To provide an aqueous ink jet composition that contains C.I. Disperse Red 60 and hardly causes remarkable generation of foreign matter or clogging in a head filter or nozzle during discharge by an ink jet method even after long-term storage.SOLUTION: An aqueous ink jet composition comprises: C.I. Disperse Red 60; a compound of the specified formula (1); a compound of the specified formula (2); at least one compound selected from the group consisting of an ethylene oxide adduct of tristyrylphenol and derivatives of the ethylene oxide adduct of tristyrylphenol; and an anionic dispersing agent.SELECTED DRAWING: None

Description

  The present invention relates to an aqueous inkjet composition.

In recent years, the use of inkjet printing has been expanded, and it has been applied to commercial printing, textile printing, and the like as well as office and home printing machines.
Ink-jet inks containing disperse dyes are also used.

  As such an ink-jet ink, after applying (printing) the ink to a recording medium to be dyed (usually composed of fibers), a direct printing method in which the dye is dyed by heat treatment such as steaming, There is a thermal transfer printing method in which dye ink is applied (printed) to an intermediate transfer medium (dedicated transfer paper), and then the dye is sublimated and transferred from the intermediate transfer medium side to a recording medium to be dyed by heat.

  Ink-jet inks containing disperse dyes generally have a problem that the storage stability of the ink is low and the ejection stability by the ink-jet method is inferior due to the problem of long-term dispersion stability of disperse dyes.

  In order to solve such problems, an ink composition described in Patent Document 1 has been proposed.

International Publication WO2005 / 121263

  However, in such an ink composition, when a specific disperse dye is included, the storage stability of the ink composition cannot be made sufficiently excellent, and a remarkable generation of foreign matters or ink jetting due to long-term storage There is a problem that clogging occurs in the head filter and the nozzle when discharging by the method. In particular, as a disperse dye, C.I. which is a disperse dye excellent in red color development. I. The present inventor has found that such a problem becomes remarkable when Disperse Red 60 is used. In particular, C.I. I. The ink composition containing Disperse Red 60 is liable to generate foreign matters (particularly crystalline foreign matters) at the gas-liquid interface, and this is particularly likely to cause clogging in the head filter and nozzles during ejection by the ink jet method. I was heading.

  The present invention has been made to solve the above-described problems, and can be realized as the following application examples.

（式（１）中、Ｒ^１は、炭素数が６以下の炭化水素基、または−（ＣＨ_２）_ｍ−ＮＲ^８Ｒ^９（ただし、ｍは６以下の整数、Ｒ^８、Ｒ^９は、それぞれ独立に、水素原子または炭素数が６以下の炭化水素基）であり、ｎは１以上の整数である。）

（式（２）中、Ｒ^２、Ｒ^３のうちの一方は−ＯＨであり、他方は−ＮＲ^４Ｒ^５（だだし、Ｒ^４、Ｒ^５は、それぞれ独立に、水素原子または炭素数が６以下の炭化水素基である。）であり、ｎは１以上の整数である。） [1] C.I. I. Disperse Red 60,
At least one selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol and an ethylene oxide adduct of tristyrylphenol. A substance A which is a compound;
An aqueous inkjet composition comprising an anionic dispersant.

(In formula (1), R ¹ is a hydrocarbon group having 6 or less carbon atoms, or — (CH ₂ ) _m —NR ⁸ R ⁹ (where m is an integer of 6 or less, R ⁸ and R ⁹ are And each independently represents a hydrogen atom or a hydrocarbon group having 6 or less carbon atoms, and n is an integer of 1 or more.)

(In the formula (2), one of R ² and R ³ is —OH, and the other is —NR ⁴ R ⁵ (where R ⁴ and R ⁵ are each independently a hydrogen atom or a carbon number) And a hydrocarbon group of 6 or less, and n is an integer of 1 or more.)

（式（３）中、Ｒ^６は、炭素数が４以下の炭化水素基であり、ｎは１以上の整数である。） [2] The aqueous inkjet according to [1], wherein the anionic dispersant is at least one of a compound represented by the following formula (3), a sodium salt of a naphthalenesulfonic acid formalin condensate, and ligninsulfonic acid. Composition.

(In Formula (3), R ⁶ is a hydrocarbon group having 4 or less carbon atoms, and n is an integer of 1 or more.)

  [3] The C.I. I. [1] or [1] satisfying the relationship of 0.002 ≦ XA / XD ≦ 1.5, where the content of Disperse Red 60 is XD [mass%] and the content of the substance A is XA [mass%] The aqueous inkjet composition according to [2].

  [4] The C.I. I. When the content of Disperse Red 60 is XD [mass%] and the content of the anionic dispersant is XB [mass%], the above relationship satisfying the relationship of 0.4 ≦ XB / XD ≦ 2.0 is satisfied [1 ] The composition for water-based inkjets in any one of [3].

  [5] When the content of the substance A is XA [mass%] and the content of the anionic dispersant is XB [mass%], the relationship of 0.002 ≦ XA / XB ≦ 1.5 is satisfied. The aqueous inkjet composition according to any one of [1] to [4].

  [6] C.I. I. The aqueous inkjet composition according to any one of [1] to [5], wherein the content of Disperse Red 60 is 0.1% by mass or more and 30% by mass or less.

  [7] The aqueous inkjet composition according to any one of [1] to [6], wherein the content of the substance A is 0.05% by mass or more and 8.0% by mass or less.

  [8] The aqueous inkjet composition according to any one of [1] to [7], wherein the content of the anionic dispersant is 0.1% by mass or more and 30% by mass or less.

  [9] The aqueous inkjet composition according to any one of [1] to [8], wherein the anionic dispersant has a weight average molecular weight of 1000 or more and 20000 or less.

  [10] The aqueous inkjet composition according to any one of [1] to [9], which is used in an open air recording apparatus.

Hereinafter, preferred embodiments of the present invention will be described in detail.
<Water-based inkjet composition>
By the way, among various disperse dyes, C.I. I. Disperse Red 60 has the following problems, while having such features as excellent color developability. That is, C.I. I. When Disperse Red 60 is used as a constituent of an aqueous inkjet composition, the storage stability of the aqueous inkjet composition cannot be sufficiently improved. There has been a significant problem that the head filter and the nozzle are clogged when the ink is discharged by the ink jet method.

Therefore, the present inventor I. Research has been conducted with the aim of providing an aqueous inkjet composition that can effectively prevent the occurrence of the above-mentioned problems while taking advantage of Disperse Red 60.
As a result, the present invention has been achieved.

  That is, the aqueous inkjet composition of the present invention is a C.I. I. Selected from the group consisting of Disperse Red 60, a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol and an ethylene oxide adduct of tristyrylphenol. And a substance A, which is at least one kind of compound, and an anionic dispersant.

（式（１）中、Ｒ^１は、炭素数が６以下の炭化水素基、または−（ＣＨ_２）_ｍ−ＮＲ^８Ｒ^９（ただし、ｍは６以下の整数、Ｒ^８、Ｒ^９は、それぞれ独立に、水素原子または炭素数が６以下の炭化水素基）であり、ｎは１以上の整数である。）

(In formula (1), R ¹ is a hydrocarbon group having 6 or less carbon atoms, or — (CH ₂ ) _m —NR ⁸ R ⁹ (where m is an integer of 6 or less, R ⁸ and R ⁹ are And each independently represents a hydrogen atom or a hydrocarbon group having 6 or less carbon atoms, and n is an integer of 1 or more.)

（式（２）中、Ｒ^２、Ｒ^３のうちの一方は−ＯＨであり、他方は−ＮＲ^４Ｒ^５（だだし、Ｒ^４、Ｒ^５は、それぞれ独立に、水素原子または炭素数が６以下の炭化水素基である。）であり、ｎは１以上の整数である。）

(In the formula (2), one of R ² and R ³ is —OH, and the other is —NR ⁴ R ⁵ (where R ⁴ and R ⁵ are each independently a hydrogen atom or a carbon number) And a hydrocarbon group of 6 or less, and n is an integer of 1 or more.)

  With such a configuration, C.I. is a disperse dye having characteristics such as excellent color development in a low-temperature process due to a relatively low molecular weight. I. While obtaining the effect of including Disperse Red 60, the generation of foreign matter (especially crystalline foreign matter at the gas-liquid interface) due to long-term storage, and clogging of the head filter and nozzle during ejection by the ink jet method It is possible to provide a difficult aqueous inkjet composition.

On the other hand, when the above conditions are not satisfied, satisfactory results cannot be obtained.
For example, when the above substance A is not used, C.I. I. The dispersion stability of Disperse Red 60 cannot be ensured, and foreign matters are likely to be generated during long-term storage of the aqueous inkjet composition.

  Further, when an anionic dispersant is not used, or when another dispersant (for example, a nonionic dispersant, a cationic dispersant, etc.) is used instead of the anionic dispersant, the aqueous inkjet composition C. in I. The dispersion stability of Disperse Red 60 cannot be ensured, and foreign matters are likely to be generated during long-term storage of the aqueous inkjet composition.

  In addition, in this specification, the composition for water-based inkjet is the concept containing the stock solution used for preparation of the said ink other than the ink itself discharged by the inkjet method. In other words, the aqueous inkjet composition of the present invention may be used as it is for ejection by an inkjet method, or may be used for ejection by an inkjet method after a treatment such as dilution. Good.

[Substance A]
The aqueous inkjet composition of the present invention comprises a compound represented by the above formula (1), a compound represented by the above formula (2), an ethylene oxide adduct of tristyrylphenol, and a derivative of an ethylene oxide adduct of tristyrylphenol. A substance A which is at least one compound selected from the group consisting of:

  The substance A is C.I. I. By using in combination with Disperse Red 60 and an anionic dispersant, C.I. I. Disperse Red 60 can have excellent dispersion stability in aqueous ink jet compositions and storage stability of aqueous ink jet compositions. It is possible to effectively prevent clogging of the head filter and nozzle. As a result, the aqueous inkjet composition can be stably discharged over a long period of time, and the quality of the recorded matter by the inkjet method can be stably improved. Further, the substance A is a component that hardly causes an adverse effect on the quality of recorded matter and an adverse effect in sublimation printing.

  The aqueous inkjet composition of the present invention may contain one type of compound as the substance A or may contain a plurality of types of compounds. More specifically, the substance A may be, for example, a mixture of a compound represented by the formula (1) and a compound represented by the formula (2).

  The content of the substance A in the aqueous inkjet composition is preferably 0.05% by mass or more and 8.0% by mass or less, and more preferably 0.07% by mass or more and 6.0% by mass or less. 0.08% by mass or more and 5.0% by mass or less is more preferable.

  Thereby, the storage stability of the aqueous inkjet composition is further improved, and the generation of foreign matters during long-term storage or the like is more effectively prevented.

  In particular, when the aqueous inkjet composition is an ink itself ejected by an inkjet method, the content of the substance A in the ink is preferably 0.05% by mass or more and 4.5% by mass or less. It is more preferably 0.07% by mass or more and 3.0% by mass or less, and further preferably 0.08% by mass or more and 2.0% by mass or less.

  Moreover, when the aqueous inkjet composition is a stock solution used for the preparation of ink ejected by the inkjet method, the content of the substance A in the stock solution is 0.5% by mass or more and 8.0% by mass or less. Of 0.75% by mass to 6.0% by mass, and more preferably 1.0% by mass to 5.0% by mass.

  In addition, when the substance A which comprises the composition for water-based inkjet contains multiple types of compound, as the said content rate, the sum total of the content rate of these multiple types of compounds shall be employ | adopted.

[Anionic dispersant]
The aqueous inkjet composition of the present invention contains an anionic dispersant.

  The anionic dispersant is not particularly limited as long as it is ionized to become an anion, but at least one of a compound represented by the following formula (3), a sodium salt of a naphthalenesulfonic acid formalin condensate, and ligninsulfonic acid. Is preferred.

（式（３）中、Ｒ^６は、炭素数が４以下の炭化水素基であり、ｎは１以上の整数である。）

(In Formula (3), R ⁶ is a hydrocarbon group having 4 or less carbon atoms, and n is an integer of 1 or more.)

  As a result, the hydrophobicity of the dispersant is improved. I. Adsorption of the dispersant to Disperse Red 60 is promoted, and the long-term stability of the aqueous inkjet composition is further improved.

R ⁶ in formula (3) may be a hydrocarbon group having 4 or less carbon atoms, and among them, a hydrocarbon group (methyl group or ethyl group) having 2 or less carbon atoms is preferable.

  As a result, the balance between hydrophobicity and hydrophilicity of the anionic dispersant can be made more suitable, and C.I. I. The dispersion stability of Disperse Red 60 can be further improved.

  The weight average molecular weight Mw of the anionic dispersant is preferably 1000 or more and 20000 or less, more preferably 2000 or more and 10,000 or less, and further preferably 3000 or more and 5000 or less.

  Thereby, the storage stability of the aqueous inkjet composition is further improved, and the generation of foreign matters during long-term storage or the like is more effectively prevented.

  The aqueous inkjet composition may contain two or more compounds as an anionic dispersant.

  The content of the anionic dispersant in the aqueous inkjet composition is preferably 0.1% by mass or more and 30% by mass or less, more preferably 0.2% by mass or more and 25% by mass or less. More preferably, the content is 3% by mass or more and 20% by mass or less.

  Thereby, the storage stability of the aqueous inkjet composition is further improved, and the generation of foreign matters during long-term storage or the like is more effectively prevented.

  In particular, when the aqueous inkjet composition is an ink itself ejected by an inkjet method, the content of the anionic dispersant in the ink is preferably 0.1% by mass or more and 20% by mass or less. It is more preferably 2% by mass or more and 15% by mass or less, and further preferably 0.3% by mass or more and 10% by mass or less.

  Moreover, when the aqueous inkjet composition is a stock solution used for the preparation of ink ejected by the inkjet method, the content of the anionic dispersant in the stock solution is 5.0% by mass or more and 30% by mass or less. It is preferable that it is 8.0 mass% or more and 25 mass% or less, and it is more preferable that it is 12 mass% or more and 20 mass% or less.

  In addition, when the anionic dispersing agent which comprises the composition for aqueous | water-based inkjet contains multiple types of compound, the sum total of the content rate of these multiple types of compounds shall be employ | adopted as said content rate.

[C. I. Disperse Red 60]
The aqueous inkjet composition is a C.I. I. Includes Disperse Red 60.

  C. in an aqueous inkjet composition. I. The average particle diameter of Disperse Red 60 is preferably 50 nm or more and 300 nm or less, more preferably 75 nm or more and 250 nm or less, and further preferably 100 nm or more and 200 nm or less.

  Thereby, the storage stability of the aqueous inkjet composition is further improved, and the generation of foreign matters during long-term storage or the like is more effectively prevented. Moreover, the recording part formed using the composition for water-based inkjets can be sublimated more effectively, and can be applied suitably by sublimation printing.

  In the present specification, the average particle diameter means a volume-based average particle diameter unless otherwise specified. The average particle diameter can be determined, for example, by measurement using Microtrac UPA (manufactured by Nikkiso Co., Ltd.).

  C. I. Examples of commercially available Disperse Red 60 include Plastread 8375 (manufactured by Arimoto Chemical Industry Co., Ltd.).

  C. in an aqueous inkjet composition. I. The content of Disperse Red 60 is preferably 0.1% by mass to 30% by mass, more preferably 2.0% by mass to 25% by mass, and more preferably 5.0% by mass to 20% by mass. More preferably, it is as follows.

  As a result, a higher color density can be obtained in the recording portion formed using the aqueous inkjet composition, and the storage stability of the aqueous inkjet composition is further improved, and foreign matter is generated during long-term storage. Is more effectively prevented.

  C. in an aqueous inkjet composition. I. When the content of Disperse Red 60 is XD [mass%] and the content of substance A is XA [mass%], it is preferable that the relationship of 0.002 ≦ XA / XD ≦ 1.5 is satisfied. It is more preferable to satisfy the relationship of 03 ≦ XA / XD ≦ 0.8, and it is even more preferable to satisfy the relationship of 0.05 ≦ XA / XD ≦ 0.5.

  Thereby, the storage stability of the aqueous inkjet composition is further improved, and the generation of foreign matters during long-term storage or the like is more effectively prevented.

  C. in an aqueous inkjet composition. I. When the content of Disperse Red 60 is XD [mass%] and the content of the anionic dispersant is XB [mass%], it is preferable that the relationship of 0.4 ≦ XB / XD ≦ 2.0 is satisfied. It is more preferable to satisfy the relationship of 0.5 ≦ XB / XD ≦ 1.5, and it is even more preferable to satisfy the relationship of 0.6 ≦ XB / XD ≦ 1.2.

  Thereby, the storage stability of the aqueous inkjet composition is further improved, and the generation of foreign matters during long-term storage or the like is more effectively prevented.

  When the content of the substance A in the aqueous inkjet composition is XA [mass%] and the content of the anionic dispersant is XB [mass%], a relationship of 0.002 ≦ XA / XB ≦ 1.5 Is preferable, 0.03 ≦ XA / XB ≦ 0.8 is more preferable, and 0.05 ≦ XA / XB ≦ 0.5 is more preferable.

  Thereby, the storage stability of the aqueous inkjet composition is further improved, and the generation of foreign matters during long-term storage or the like is more effectively prevented.

[water]
The aqueous inkjet composition contains water.

  The content of water in the aqueous inkjet composition is not particularly limited, but is preferably 30% by mass or more and 85% by mass or less, more preferably 35% by mass or more and 80% by mass or less, and 40% by mass. More preferably, it is 75 mass% or less.

  Thereby, the viscosity of the composition for water-based inkjets can be more reliably adjusted to a suitable value, and the discharge stability by an inkjet method can be improved more.

[Solvents other than water]
The aqueous inkjet composition may contain a solvent other than water.

  Thereby, the viscosity of the composition for water-based inkjets can be adjusted suitably, or the moisture retention of the composition for water-based inkjets can be improved. As a result, droplet discharge by the ink jet method can be performed more stably.

  Examples of the solvent other than water contained in the aqueous inkjet composition include glycerin, propylene glycol, and 2-pyrrolidone.

  By containing these solvents, the evaporation rate can be moderated by excellent moisture retention ability, and more stable droplet discharge can be performed.

The content of the solvent other than water contained in the aqueous inkjet composition is preferably 0% by mass to 45% by mass, more preferably 10% by mass to 43% by mass, and more preferably 15% by mass. More preferably, it is 40 mass% or less.
Thereby, the effect by including solvents other than the water mentioned above is exhibited more notably.

[Surfactant]
The aqueous inkjet composition may contain a surfactant.

  As a result, the wettability of the aqueous inkjet composition with respect to the recording medium (base material) can be made more suitable, which is advantageous in obtaining better image quality.

  As the surfactant contained in the aqueous inkjet composition, for example, various surfactants such as an anionic surfactant, a cationic surfactant, and a nonionic surfactant can be used.

  More specifically, examples of the surfactant contained in the aqueous inkjet composition include acetylene surfactants, silicone surfactants, and fluorine surfactants.

  When the aqueous inkjet composition contains a silicone-based surfactant, the wettability of the aqueous inkjet composition with respect to the recording medium (base material) can be further improved, and an image with better gradation. (Recording part) can be formed.

  When the aqueous inkjet composition contains a silicone surfactant, the content of the silicone surfactant in the aqueous inkjet composition is C.I. I. Disperse Red 60: It is preferably 5.0 parts by mass or more and 150 parts by mass or less, more preferably 7.0 parts by mass or more and 140 parts by mass or less, and more preferably 10 parts by mass or more and 70 parts by mass with respect to 100 parts by mass. More preferably, it is less than or equal to parts.

  Thereby, the effect by including the silicone type surfactant mentioned above is exhibited more notably.

  Examples of commercially available silicone surfactants include BYK-306, BYK-307, BYK-333, BYK-337, BYK-341, BYK-345, BYK-346, BYK-347, BYK-348, and BYK-. 349, BYK-378 (trade name, manufactured by Big Chemie Japan), KF-351A, KF-352A, KF-353, KF-354L, KF-355A, KF-615A, KF-945, KF-640, KF -642, KF-643, KF-6020, X-22-4515, KF-6011, KF-6012, KF-6015, KF-6017 (above trade names, manufactured by Shin-Etsu Chemical Co., Ltd.) and the like.

[Other ingredients]
The aqueous inkjet composition may contain components (other components) other than the components described above.

  Examples of other components include C.I. I. Colorants other than Disperse Red 60, dispersants other than those described above, triethylene glycol monomethyl ether, triethylene glycol monobutyl ether, diethylene glycol monomethyl ether, 1,2-hexanediol, 1,2-pentanediol, 1,2-butanediol , A penetrant such as 3-methyl 1,5-pentanediol, a pH adjuster, a chelating agent such as ethylenediaminetetraacetate (EDTA), an antiseptic / antifungal agent, and a rust inhibitor. As the antiseptic and fungicide, for example, a compound having an isothiazoline ring structure in the molecule can be preferably used.

  The content of other components (in the case where plural types of components are included as other components) is preferably 6% by mass or less, and more preferably 5% by mass or less.

  In particular, when the aqueous inkjet composition of the present invention contains a dispersant (other dispersant) other than the above, the content of the dispersant (other dispersant) is preferably 5% by mass or less. More preferably, it is 3 mass% or less.

  The surface tension of the aqueous inkjet composition at 25 ° C. is preferably 20 mN / m or more and 50 mN / m or less, more preferably 21 mN / m or more and 40 mN / m or less, and 23 mN / m or more and 30 mN / m or less. More preferably.

  Thereby, the clogging of the nozzle of the discharge apparatus by an inkjet system becomes difficult to occur, and the discharge stability of the aqueous inkjet composition is further improved. Further, even when the nozzle is clogged, the recoverability by capping the nozzle (capping) can be further improved.

  As the surface tension, a value measured by the Wilhelmy method can be adopted. A surface tension meter (for example, CBVP-7 manufactured by Kyowa Interface Science Co., Ltd.) can be used for measuring the surface tension.

The viscosity at 25 ° C. of the aqueous inkjet composition is preferably 2 mPa · s or more and 30 mPa · s or less, more preferably 3 mPa · s or more and 20 mPa · s or less, and 4 mPa · s or more and 10 mPa · s or less. More preferably.
Thereby, the ejection stability of the aqueous inkjet composition is further improved.

The viscosity is increased from 10 [s ⁻¹ ] to 1000 [s ⁻¹ ] at 25 ° C. using a viscoelasticity tester (for example, MCR-300 manufactured by Pysica), It can be measured by reading the viscosity at Shear Rate 200.

  The aqueous inkjet composition of the present invention is usually applied to a recording apparatus using an inkjet method in a state of being stored in a container such as a cartridge, a bag, or a tank. In other words, the recording apparatus according to the present invention includes a container (such as an ink cartridge) that stores the aqueous inkjet composition of the present invention.

  The aqueous inkjet composition of the present invention may be an ink ejected by the inkjet method or a stock solution used for preparing the ink, and the specific configuration of the apparatus for ejecting droplets is not limited. An ink jet composition includes an air-opening recording apparatus (more specifically, an ink jet container including an ink container having an ink injection port capable of replenishing ink and a recording head having a nozzle hole for discharging the ink. It is preferable that the recording apparatus be applied to a recording apparatus (including a stock solution).

  In such a recording apparatus, C.I. I. When ink containing Disperse Red 60 is applied, there is a problem that foreign matter (particularly crystalline foreign matter) is particularly likely to occur at the gas-liquid interface due to the ink coming into contact with the atmosphere. Therefore, even when the present invention is applied to such a recording apparatus, it is possible to effectively prevent the occurrence of the above problems. That is, the effects of the present invention are more prominent when applied to an open air recording apparatus.

<Recording method>
The aqueous inkjet composition of the present invention can be applied to, for example, a direct printing method, a thermal transfer printing method (for example, sublimation printing), and the like. I. Since Disperse Red 60 has sublimation properties, it can be suitably applied to a thermal transfer printing method.

  Hereinafter, an example of a thermal transfer printing method (sublimation printing) will be described as a recording method using the aqueous inkjet composition of the present invention.

  The recording method according to the present embodiment includes an ink adhering step for adhering an aqueous ink jet composition to an intermediate transfer medium by an ink jet method, and heating the intermediate transfer medium to which the aqueous ink jet composition is adhered to form an aqueous ink jet composition. C. as a sublimable dye contained in the product I. A transfer step of transferring Disperse Red 60 to a recording medium.

[Ink adhesion process]
In the ink adhesion step, the aqueous inkjet composition is adhered to the intermediate transfer medium by an inkjet method. The aqueous inkjet composition can be discharged by an inkjet method using a known inkjet recording apparatus. As a discharging method, a piezo method, a method of discharging ink by bubbles generated by heating the ink, or the like can be used. Among these, the piezo method is preferable from the viewpoint of difficulty in altering the composition for aqueous inkjet.

  In the ink adhesion step, an ink other than the aqueous inkjet composition according to the present invention may be used in combination.

[Intermediate transfer medium]
As the intermediate transfer medium, for example, paper such as plain paper, a recording medium provided with an ink receiving layer (referred to as ink jet dedicated paper, coated paper, or the like) can be used. Among these, paper having an ink receiving layer made of inorganic fine particles such as silica is preferable. As a result, an intermediate transfer medium in which bleeding or the like is suppressed in the process of drying the aqueous inkjet composition attached to the intermediate transfer medium can be obtained. I. Disperse Red 60 sublimation tends to proceed more smoothly.

[Transfer process]
Thereafter, the intermediate transfer medium to which the aqueous inkjet composition is adhered is heated to form C.I. as a constituent of the aqueous inkjet composition. I. Disperse Red 60 is transferred to a recording medium. Thereby, a recorded matter is obtained.

  The heating temperature in this step is preferably 160 ° C. or higher and 220 ° C. or lower, and more preferably 170 ° C. or higher and 200 ° C. or lower.

  Thereby, the energy required for transfer can be reduced, and the productivity of recorded matter can be further improved. Further, the color developability of the obtained recorded matter can be further improved.

  Although the heating time in this step depends on the heating temperature, it is preferably 30 seconds or longer and 90 seconds or shorter, and more preferably 45 seconds or longer and 80 seconds or shorter.

  Thereby, the energy required for transfer can be reduced, and the productivity of recorded matter can be further improved. Further, the color developability of the obtained recorded matter can be further improved.

  In addition, this step may be performed by heating the surface of the intermediate transfer medium, to which the aqueous inkjet composition is adhered, facing the recording medium at a predetermined interval and facing the surface of the recording medium. Although it may be performed by heating in a close contact state, it is preferably performed by heating in a state where the surface of the intermediate transfer medium to which the aqueous inkjet composition is adhered is in close contact with the surface of the recording medium.

  Thereby, the energy required for transfer can be reduced, and the productivity of recorded matter can be further improved. Further, the color developability of the obtained recorded matter can be further improved.

[recoding media]
Although it does not specifically limit as a recording medium, For example, a cloth (hydrophobic fiber cloth etc.), a resin (plastic) film, paper, glass, a metal, ceramics etc. are mentioned. As the recording medium, a recording medium having a three-dimensional shape such as a sheet shape, a spherical shape, or a rectangular parallelepiped shape may be used.

  When the recording medium is a fabric, examples of fibers constituting the fabric include polyester fibers, nylon fibers, triacetate fibers, diacetate fibers, polyamide fibers, and blended products using two or more of these fibers. . Moreover, you may use the blended products of these with regenerated fibers, such as rayon, or natural fibers, such as cotton, silk, and wool.

  When the recording medium is a resin (plastic) film, examples of the resin (plastic) film include a polyester film, a polyurethane film, a polycarbonate film, a polyphenylene sulfide film, a polyimide film, and a polyamideimide film.

  The resin (plastic) film may be a laminated body in which a plurality of layers are laminated, or may be composed of an inclined material in which the composition of the material changes in an inclined manner.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to these.

  For example, the aqueous inkjet composition of the present invention may be any composition that can be used for ejection in an inkjet system, and may not be applied to the recording method as described above.

  For example, in addition to the steps as described above, the method may be applied to a method having other steps (a pretreatment step, an intermediate treatment step, a post treatment step).

  In this case, examples of the pretreatment step include a step of applying a coat layer to the recording medium.

Examples of the intermediate processing step include a step of preheating the recording medium.
Moreover, as a post-processing process, the process etc. which wash | clean a recording medium are mentioned, for example.

  The aqueous inkjet composition of the present invention can also be suitably applied to sublimation transfer without using an intermediate transfer medium. As sublimation transfer without using an intermediate transfer medium, for example, a step of attaching an aqueous inkjet composition to an ink receiving layer of a recording medium (film product or the like) provided with a peelable ink receiving layer by an inkjet method; A step of heating a recording medium provided with an ink receiving layer to which an aqueous inkjet composition is adhered as it is, sublimation diffusion dyeing from the ink receiving layer to a recording medium on the lower layer side, and peeling the ink receiving layer from the recording medium And a method of obtaining a recorded matter.

Next, specific examples of the present invention will be described.
[1] Preparation of stock solution for ink jet ink production (aqueous ink jet composition) (Example A1)
First, C.I. I. Disperse Red 60, an ethylene oxide adduct of tristyrylphenol as substance A (a substance in which R ⁷ in formula (4) is H), and methylnaphthalenesulfonic acid formalin condensate Na (formula as an anionic dispersant) (A substance in which R ^{6 in} (3) is —CH ₃ ) and pure water were mixed at a ratio shown in Table 3, and stirred with a high shear mixer (manufactured by Silverson) at 3000 rpm to form a slurry. . Thereafter, the produced slurry and 0.5 mm diameter glass beads were stirred and dispersed in a bead mill (LMZ015 Ashizawa Finetech) under water cooling to produce a stock solution for producing an inkjet ink as an aqueous inkjet composition.

  C. in a stock solution for producing an inkjet ink. I. The average particle size of Disperse Red 60 was 150 nm.

(Examples A2 to A21)
Aqueous inkjet composition as in Example A1, except that the types of substance A and anionic dispersant, and the blending ratio of each component are as shown in Table 1, Table 2, Table 3, and Table 4. A stock solution for producing an inkjet ink was produced.

(Comparative Examples A1 to A6)
Aqueous inkjet composition as in Example A1, except that the types of disperse dye, substance A and anionic dispersant, and the blending ratio of each component are shown in Table 1, Table 2, and Table 4. A stock solution for producing an inkjet ink was produced.

Table 1 shows the relationship between the abbreviations and conditions of the substance A used in the preparation of the aqueous inkjet compositions (stock solutions for producing inkjet inks) of the respective Examples and Comparative Examples, and the relationship between the abbreviations of the dispersant and the conditions. Are shown in Table 2, and the compositions of the water-based inkjet compositions (stock solutions for producing inkjet inks) of the respective Examples and Comparative Examples are shown in Tables 3 and 4. In the table, C.I. I. Disperse Red 60 is changed to “DR60”, C.I. I. Disperse Red 153 is changed to “DR153”, C.I. I. Disperse Red 167 is "DR167", polycarboxylic acid-based activator (Sanyo Kasei Kogyo Co., Ltd., Carribbon L-400) is "A1 '", polyoxy as a dispersant (nonionic dispersant) other than anionic dispersant Ethylene sorbitan fatty acid ester (manufactured by Toho Chemical Co., Ltd., sorbon T-40) was indicated as “B1 ′”. In addition, A3 as the substance A used in Example A3 or the like is represented by the following formula (5). In addition, each of the inkjet ink manufacturing stock solutions of Examples A1 to A21 has a viscosity within a range of 2.0 mPa · s to 30 mPa · s, and a surface tension of 25 mN / m to 60 mN / m. The value was within the range. The viscosity was increased from 10 [s ⁻¹ ] to 1000 [s ⁻¹ ] at 25 ° C. using a viscoelasticity tester MCR-300 (manufactured by Pysica). It was measured by reading the viscosity at the time. The surface tension was measured by a Wilhelmy method at 25 ° C. using a surface tension meter (CBVP-7, manufactured by Kyowa Interface Science Co., Ltd.).

[2] Evaluation of stock solution for producing inkjet ink [2-1] Storage stability (change in particle size)
About the aqueous inkjet composition (stock solution for inkjet ink production) of each of the above Examples and Comparative Examples, respectively, the average particle diameter of the disperse dye immediately after production and the container was allowed to stand in an environment of 60 ° C. for 1 week. The average particle size of the disperse dye was determined, and from these values, the variation rate of the average particle size of the disperse dye when left in an environment of 60 ° C. for one week with respect to the average particle size of the disperse dye immediately after production was determined. The evaluation was made according to the following criteria. In addition, Microtrac UPA (made by Nikkiso Co., Ltd.) was used for the measurement of average particle diameter.

A: The variation rate of the average particle diameter is less than 3%.
B: The variation rate of the average particle diameter is 3% or more and less than 5%.
C: The variation rate of the average particle diameter is 5% or more and less than 7%.
D: The variation rate of the average particle diameter is 7% or more and less than 10%.
E: The variation rate of the average particle diameter is 10% or more.

[2-2] Occurrence of foreign matter 10 mL each of the aqueous inkjet composition (stock solution for inkjet ink production) of each of the above examples and comparative examples is placed in a predetermined glass bottle, and a gas-liquid interface exists. Then, it was left in an environment of 60 ° C. for 5 days. Thereafter, the aqueous inkjet composition (stock solution for inkjet ink production) is filtered through a metal mesh filter (caliber: 10 μm), and the number of solids remaining on the metal mesh filter is counted per 1 mm square, according to the following criteria: evaluated.

A: The number of solids per 1 mm square was less than 5.
B: The number of solids per 1 mm square was 5 or more and less than 20.
C: The number of solids per 1 mm square was 20 or more and less than 30.
D: The number of solids per 1 mm square was 30 or more and less than 50.
E: The number of solids per 1 mm square was 50 or more.
These results are summarized in Table 5.

  As is apparent from Table 5, excellent results were obtained in the present invention. On the other hand, in the comparative example, a satisfactory result was not obtained.

[3] Preparation of inkjet ink (aqueous inkjet composition) (Example B1)
Table 6 shows the stock solution for ink-jet ink production prepared in Example A1, glycerin, 2-pyrrolidone, propylene glycol, BYK348 (made by Big Chemie Japan) as a silicone surfactant, and pure water. By mixing at the indicated ratio and stirring at 3000 rpm with a high shear mixer (manufactured by Silverson), an inkjet ink as an aqueous inkjet composition was produced.

  C. in inkjet ink I. The average particle size of Disperse Red 60 was 150 nm.

(Examples B2 to B19)
The types of stock solutions for producing inkjet inks are shown in Tables 6 and 7, and the water-based inkjets are used in the same manner as in Example B1 except that the mixing ratio of each component is shown in Tables 6 and 7. An inkjet ink as a composition was produced.

(Comparative Examples B1 to B6)
Inkjet ink as an aqueous inkjet composition in the same manner as in Example B1 except that the types of stock solutions for producing inkjet inks are as shown in Table 7 and the blending ratio of each component is as shown in Table 7. Manufactured.

Tables 6 and 7 collectively show the conditions of the aqueous inkjet compositions (inkjet inks) of the Examples and Comparative Examples. In the table, glycerin is “Gly”, 2-pyrrolidone is “2-Py”, propylene glycol is “PG”, silicone surfactant BYK348 (manufactured by BYK Japan) is “BYK348”, acetylene-based Orphine EXP4300 (manufactured by Nissin Chemical Industry Co., Ltd.) as a surfactant was indicated as “EXP4300”. In addition, the inkjet inks of Examples B1 to B19 all have a viscosity within a range of 2.0 mPa · s to 10 mPa · s, and a surface tension within a range of 25 mN / m to 35 mN / m. Value. The viscosity was increased from 10 [s ⁻¹ ] to 1000 [s ⁻¹ ] at 25 ° C. using a viscoelasticity tester MCR-300 (manufactured by Pysica). It was measured by reading the viscosity at the time. The surface tension was measured by a Wilhelmy method at 25 ° C. using a surface tension meter (CBVP-7, manufactured by Kyowa Interface Science Co., Ltd.).

[4] Evaluation of inkjet ink [4-1] Storage stability (change in particle size)
The aqueous inkjet compositions (inkjet inks) of the above Examples and Comparative Examples were each average particle size of the disperse dye immediately after production and when left in a predetermined ink storage container for 1 week in an environment of 60 ° C. The average particle size of the disperse dye was determined, and from these values, the variation rate of the average particle size of the disperse dye when left for 1 week in an environment of 60 ° C. with respect to the average particle size of the disperse dye immediately after production was determined, Evaluation was made according to the following criteria. In addition, Microtrac UPA (made by Nikkiso Co., Ltd.) was used for the measurement of average particle diameter.

A: The variation rate of the average particle diameter is less than 3%.
B: The variation rate of the average particle diameter is 3% or more and less than 5%.
C: The variation rate of the average particle diameter is 5% or more and less than 7%.
D: The variation rate of the average particle diameter is 7% or more and less than 10%.
E: The variation rate of the average particle diameter is 10% or more.

[4-2] Occurrence of foreign matter Each 10 mL of the aqueous inkjet composition (inkjet ink) of each of the above Examples and Comparative Examples was placed in a predetermined glass bottle, and a gas-liquid interface was present. It was left for 5 days in an environment of ° C. Thereafter, the aqueous inkjet composition (inkjet ink) was filtered with a metal mesh filter (caliber 10 μm), and the number of solids remaining on the metal mesh filter per 1 mm square was counted and evaluated according to the following criteria.

A: The number of solids per 1 mm square was less than 5.
B: The number of solids per 1 mm square was 5 or more and less than 20.
C: The number of solids per 1 mm square was 20 or more and less than 30.
D: The number of solids per 1 mm square was 30 or more and less than 50.
E: The number of solids per 1 mm square was 50 or more.

[4-3] Ejection stability by ink jet method Each of the aqueous ink jet compositions (ink jet inks) of each of the examples and comparative examples is filled in a predetermined ink container and left in an environment of 60 ° C. for 5 days. did.

  After that, the container is mounted on a recording device PX-H6000 (manufactured by Seiko Epson), ejects ink jet ink, and is solid on a TRANSJET Classic (manufactured by Cham Paper), which is an intermediate transfer medium, at a recording resolution of 1440 × 720 dpi. A pattern was applied. The operating environment of the recording apparatus (printer) was 40 ° C. and 20 RH%.

  The number of missing nozzles when 30 solid patterns were recorded on the intermediate transfer medium was examined and evaluated according to the following criteria.

A: The number of missing nozzles was zero.
B: The number of missing nozzles was 1 or more and 9 or less.
C: The number of missing nozzles was 10 or more and 19 or less.
D: The number of missing nozzles was 20 or more and 29 or less.
E: The number of missing nozzles was 30 or more.

  Note that the PX-H6000 ink storage container (the ink storage container described above) manufactured by Seiko Epson Co., Ltd. has an ink injection port that can be replenished with the aqueous inkjet composition. It is open to the atmosphere.

[4-4] Clogging recovery property Each of the aqueous inkjet compositions (inkjet inks) of each of the examples and the comparative examples is filled into a predetermined ink storage container, and the storage container is used as a recording apparatus PX-H6000. (Seiko Epson) was installed.

  After confirming that all the nozzles discharged normally, the recording apparatus was turned off in a normal state and left for 2 months in an environment of 40 ° C.

  Thereafter, the number of times required to reach normal discharge in the recovery operation by suction was determined and evaluated according to the following criteria.

A: Clean discharge was performed immediately after the power was turned on.
B: Normalized in one or two recovery operations.
C: Normalized after 3 to 4 recovery operations.
D: Normalized after 5 to 6 recovery operations.
E: It did not recover after 6 recovery operations.

[4-5] Color development (OD value)
The adhesion side of the aqueous inkjet composition of the 30th intermediate transfer medium to which the inkjet ink was adhered in [4-3] was adhered to a fabric (100% polyester, Amina, manufactured by Toray Industries, Inc.) that is a white recording medium. In this state, using a heat press machine (TP-608M, manufactured by Taiyo Seiki Co., Ltd.), heating was performed at 180 ° C. for 60 seconds to perform sublimation transfer to obtain each recorded matter.

  Each recorded matter was evaluated for color developability. Specifically, the OD value was measured for each recorded matter using a colorimeter (Gretag Macbeth Spectrolino, manufactured by X-Rite) and evaluated according to the following criteria.

A: The OD value is 1.50 or more.
B: The OD value is 1.45 or more and less than 1.50.
C: The OD value is 1.40 or more and less than 1.45.
D: The OD value is 1.35 or more and less than 1.40.
E: The OD value is less than 1.35.
These results are summarized in Table 8.

  As is apparent from Table 8, excellent results were obtained in the present invention. On the other hand, in the comparative example, a satisfactory result was not obtained.

Claims (10)

C. I. Disperse Red 60,
At least one selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol and an ethylene oxide adduct of tristyrylphenol. A substance A which is a compound;
An aqueous inkjet composition comprising an anionic dispersant.

(In formula (1), R ¹ is a hydrocarbon group having 6 or less carbon atoms, or — (CH ₂ ) _m —NR ⁸ R ⁹ (where m is an integer of 6 or less, R ⁸ and R ⁹ are And each independently represents a hydrogen atom or a hydrocarbon group having 6 or less carbon atoms, and n is an integer of 1 or more.)

(In the formula (2), one of R ² and R ³ is —OH, and the other is —NR ⁴ R ⁵ (where R ⁴ and R ⁵ are each independently a hydrogen atom or a carbon number) And a hydrocarbon group of 6 or less, and n is an integer of 1 or more.) 2. The aqueous inkjet composition according to claim 1, wherein the anionic dispersant is at least one of a compound represented by the following formula (3), a sodium salt of naphthalenesulfonic acid formalin condensate, and ligninsulfonic acid.

(In Formula (3), R ⁶ is a hydrocarbon group having 4 or less carbon atoms, and n is an integer of 1 or more.)   C. above. I. 3. The relationship of 0.002 ≦ XA / XD ≦ 1.5 is satisfied, where the content of Disperse Red 60 is XD [mass%] and the content of the substance A is XA [mass%]. The composition for water-based inkjet as described in any one of.   C. above. I. 2. The relationship of 0.4 ≦ XB / XD ≦ 2.0 is satisfied, where the content of Disperse Red 60 is XD [mass%] and the content of the anionic dispersant is XB [mass%]. 4. The aqueous inkjet composition according to any one of items 3 to 3.   2. The relationship of 0.002 ≦ XA / XB ≦ 1.5 is satisfied, where XA [mass%] is the content of the substance A and XB [mass%] is the content of the anionic dispersant. The composition for water-based inkjets of any one of thru | or 4.   C. above. I. The aqueous inkjet composition according to any one of claims 1 to 5, wherein the content of Disperse Red 60 is 0.1 mass% or more and 30 mass% or less.   The aqueous inkjet composition according to claim 1, wherein the content of the substance A is 0.05% by mass or more and 8.0% by mass or less.   The aqueous inkjet composition according to any one of claims 1 to 7, wherein a content of the anionic dispersant is 0.1% by mass or more and 30% by mass or less.   The water-based inkjet composition according to any one of claims 1 to 8, wherein the anionic dispersant has a weight average molecular weight of 1,000 or more and 20,000 or less.   The aqueous inkjet composition according to any one of claims 1 to 9, which is used in an open air recording apparatus.