JPH0641481A - Ink and method for ink jet recording - Google Patents

Abstract

PURPOSE:To obtain the ink which exhibits good delivery characteristics during delivery from a recording head, requires a low transfer pressure, and forms a high-quality ink image stably regardless of the place where it is used by using a combination of a drying solvent with a nondrying solvent as the vehicle of the ink. CONSTITUTION:An ink which is used in ink jet recording by forming an ink image using the ink on a transfer medium and transferring the image to a recording medium comprises a vehicle consisting of an easily drying solvent and a nondrying solvent and a solid color component consisting of a pigment dispersed in or a dye dissolved in the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a transfer type ink jet recording method and an ink jet recording method for forming an ink image on a transfer medium and then transferring it to the recording medium to obtain an ink image on the recording medium. Inkjet ink.

[0002]

2. Description of the Related Art In contrast to a direct type ink jet printer which directly ejects ink droplets onto a recording paper to form an ink image, a transfer type ink jet printer is an ink jet printer which is caused by unintended contact between the recording paper or paper dust and a recording head. It has features that it does not cause jams, high reliability is obtained, and high image quality is obtained without depending on paper quality (smoothness of paper surface). As a conventional transfer type ink jet printer, the configurations described in JP-A-59-22595 and US Pat. No. 4,538,156 are known. In these, a recording head having a plurality of nozzles is provided for a drum-shaped or belt-shaped transfer medium with a gap therebetween. After an ink image is formed on the transfer medium by the recording head, the recording medium, which is the recording medium, is brought into contact with and pressed against the transfer medium, whereby the ink image is transferred to the recording sheet.

[0003]

The above-mentioned conventional ink jet printer has a problem that the ink image on the transfer medium must be transferred with a large pressure in order to faithfully transfer it to the recording paper. It was

That is, the ink must be a sufficiently low-viscosity liquid having a viscosity below a certain value in order to be ejected from the ink jet head. Normally, the required ejection characteristics cannot be obtained unless the viscosity is at least lower than 50 mPa · s for ejection. The ink image formed on the transfer medium by ejecting the ink is composed of droplets of a low-viscosity liquid and easily penetrates the recording paper. Further, when the image is transferred by being brought into contact with the recording paper, it passes through a narrow gap, so that it is spread and distorted. Therefore, in the next transfer step to the recording paper, when the recording paper is brought into contact with and pressed, the shape is distorted and the recording paper is soaked and the edges are unclear, and the image quality is deteriorated.

On the other hand, in the method disclosed in Japanese Patent Laid-Open No. 62-92849, the ink image on the transfer medium is dried and then transferred onto the recording paper. According to this method, the ink image on the transfer medium is not easily deformed and does not soak into the recording paper. Therefore, due to the pressure transfer, the ink image on the transfer medium is faithfully transferred to the recording paper without deterioration of the image quality, and a high quality image is obtained.

However, in this case, the ink image on the transfer medium is in a semi-solid state in which drying has progressed, and unless a large pressure is applied, the adhesive force between the ink and the recording paper cannot be obtained, and good transfer characteristics are obtained. It had to be configured to apply a large amount of pressure to. Since the pressure required for transfer is large, there are drawbacks such as an increase in size and cost of the device due to the structure of the device.

On the other hand, the present inventors have transferred the ink image on the transfer medium in a state where the ink image is kept in an appropriate viscous state in a state where the drying has not progressed to a certain degree or more. By doing so, it was found that there is a condition that a high transfer quality can be achieved with a small transfer pressure and without soaking or distortion of the shape.

This characteristic is shown by the experimental results in FIG.

The transfer medium used for the experiment is a urethane rubber having a thickness of 1 mm and a fluororesin coating layer having a thickness of 3 μm formed on the surface thereof. The ink is formed by using a non-polar insulating solvent as an ink solvent, specifically Isopar G manufactured by Exxon Chemical Co., and dispersing a pigment and a resin therein. The pigment and the resin constitute the color material solid component, and the weight compositions of the color material solid component and the ink solvent are 25% and 75%, respectively.
When the solid content concentration is defined below, the solid content concentration of this ink is 25%.

Solid content concentration = coloring material solid component weight / (coloring material solid component weight + ink solvent weight) In the graph of FIG. 4, the horizontal axis represents the solid content concentration of the ink image on the transfer medium. The vertical axis represents the pressure applied during transfer.

A shaded area U is an area where a high-quality transfer image can be obtained. Similarly, an area S is a blur on the recording paper at the time of transfer,
An area in which image quality is deteriorated due to spread deformation, and V is an area in which image quality is deteriorated due to transfer residue.

In the region of U, there is a certain range of proper solid content concentration at which transfer is possible for a specific pressure.

The characteristics of the ink used in this experiment are represented by typical numerical values. When a transfer pressure of 3 Kg / cm ² is applied as the transfer pressure, the proper solid content concentration for obtaining a high quality transferred image is 35 to 45%. Met. In order to perform low-pressure transfer, it is necessary to maintain the above solid content and transfer an ink image in an appropriate viscous state.

However, the solid content concentration of the ink image on the transfer medium changes with time. This will be described using the result of another experiment in FIG. The ink image on the transfer medium is composed of the ink solvent and the solid content of the coloring material. When the ink solvent easily evaporates, the ink solvent remaining on the transfer medium changes with time, and the solid content concentration changes accordingly. In this experiment, the amount of ink ejected from the inkjet recording head was 0.06 μg per dot, which formed dots having a diameter of 84 μm on the transfer medium. Since the weight ratio of the ink solvent in the ink is 75%, the amount of the ink solvent is 0.045 μg in the ink image portion. The remaining amount of the ink solvent corresponding to the appropriate solid content concentration of 35 to 45% is 0.018 to 0.027 μg, and the amount of the ink solvent removed from the transfer medium is 0.018 to 0.027 μg.
Is. As the drying progressed, the concentration became higher than the proper solid content concentration, and the transfer could not be performed at the above transfer pressure.

As described above, in the case of the relationship between the transfer pressure and the solid content concentration, the time from the formation of the ink image on the transfer medium to the transfer step varies depending on the location, and the allowable time interval varies depending on the location. The short length made it difficult to implement. That is, since the portions having different solid content concentrations coexist, the transfer characteristics differ depending on the location, and transfer unevenness occurs, and a high-quality transfer image cannot be obtained.

It is necessary to realize the low pressure transfer in the above-mentioned moderately viscous state so that it can be easily made into a device, and the ink image on the transfer medium is kept in the proper viscous state regardless of the position. The task was to make sure that

The present invention focuses on this characteristic and solves the problems of the prior art. The object is to realize good ejection characteristics when ejecting from an ink jet recording head onto a transfer medium. Another object of the present invention is to provide an inkjet ink and an inkjet recording method that can perform transfer from a transfer medium to a recording medium with a small transfer pressure, and can stably obtain a high-quality ink image regardless of location.

[0018]

The ink for ink jet recording of the present invention is used in an ink jet recording method for transferring an ink jet ink image formed on a surface of a transfer medium to a recording medium to obtain an ink image on the recording medium. In the inkjet ink described above, the inkjet ink is composed of a vehicle and a solid component of a formula material comprising a pigment dispersed in the vehicle or a dissolved dye, and the vehicle is (1) an ink solvent-drying component which is easily dried. And (2) an ink solvent non-drying component that is difficult to dry.

Further, the ink jet recording method of the present invention is
Using the above recording ink, (1) With the above ink drops,
Forming an ink image on the transfer medium, (2) removing the ink solvent drying component from the ink image on the transfer medium, and (3) removing the ink solvent drying component, And a step of transferring an ink image composed of a color material solid component and an ink solvent drying component from the transfer medium to a recording medium.

[0020]

According to the above method, the ink-jet ink has a low viscosity when ejected from the recording head, and good ejection characteristics are obtained. The ink image formed by this ink is dispersed in the solvent on the transfer medium. The drying component is removed, and an ink image in a proper viscous state composed of the non-drying component and the coloring material solid component is formed on the transfer medium. Since the non-drying component remains in the ink image stably for a long time, the ink image on the transfer medium is kept in a constant viscous state. By transferring while the viscous state is maintained, the ink image transfer on the transfer medium can be transferred to the recording medium at a low pressure without causing transfer unevenness depending on the location.

Since the ink solvent non-drying component is difficult to dry, it remains stably on the transfer medium. As a result, the ink image on the transfer medium remains moderately viscous for a long time,
High-quality transfer can be performed at low pressure regardless of the difference in concentration time depending on the location.

[0022]

EXAMPLES Examples of the present invention will be described.

The ink-jet ink of the present invention is composed of a mixed dispersion medium of a drying component having a drying property and a non-drying component having a non-drying property, in which the dispersion medium as a vehicle is a nonpolar insulating solvent. Has been done.

Such an ink, as an ink composition in which a pigment is dispersed in the mixed dispersion medium, has a granulation step of adjusting the dispersed particle diameter of the pigment as a first step, and then a second step.
In the process, the non-polar mixed dispersion medium is used as a drying component or a non-drying component as the first ink solvent in the dispersion pigment,
It can be manufactured in two steps including a step of imparting dispersion stability to the first ink solvent.

Step 1 is a step of adjusting the particle size of the dispersed pigment, and comprises the following.

A solution A is prepared by previously copolymerizing a resin in the first ink solvent.

Add a pigment to the solution A and disperse to primary particles.

Since the pigment particle size is greatly affected by the selected copolymer resin and the dispersion share, the dispersion share of the solution A is changed to adjust the dispersed pigment to a desired dispersion particle size (specific resin Dispersion B is obtained by reaggregating the primary particles of the pigment by the action.

Step 2 is a step of stabilizing the dispersion, which comprises:

Solution C is obtained by dissolving a resin or a dispersion stabilizer effective in stabilizing the dispersion of pigment particles in the first ink solvent.

Solution C is added to solution B to obtain solution D.

The second ink solvent (or the first ink) in solution D
A mixed solvent of the ink solvent and the second ink solvent) is added in an appropriate amount to adjust the composition ratio and viscosity of the non-drying component of the ink solvent and the solid content of the coloring material to obtain an inkjet ink.

The following may be considered as the composition in the ink of the present invention.

The pigments are as follows. For example, furnace black, lamp black, acetylene black,
Examples thereof include carbon blacks such as channel black, metals such as copper, iron and titanium oxide or metal oxides, and organic pigments such as ortho-nitroaniline black.

Further, a resin and / or a dispersion stabilizer are added for the purpose of adjusting the particle size of the dispersed pigment, adjusting the viscosity of the ink, or improving the scratch resistance of the recorded matter after printing.

The resin can be obtained by copolymerizing monomers. As an example, it is possible to use a resin having a polar group that has a portion that solvates a non-polar insulating solvent and a portion that does not solvate, and that has a polar group that binds both portions.

Examples of such a monomer which is solvated after polymerization in a nonpolar insulating solvent include lauryl matacrylate, stearyl methacrylate and 2-ethyl.

Examples of the monomer that is difficult to be solvated after polymerization in a nonpolar insulating solvent include methyl methacrylate, ethyl methacrylate and isopropyl.

As the monomer having a polar group used as a reaction active point for copolymerizing the easily solvable portion and the poorly solvable portion, acrylic acid, methacrylic acid, itaconic acid, fumaric acid, maleic acid, styrene can be used. Examples thereof include sulfonic acid, dimethylaminomethyl methacrylate, diethylaminoethyl methacrylate, vinylpyrrolidone, vinylpiperidine, vinyllactam and the like.

Second step of the ink jet ink manufacturing process
As the dispersion stabilizer to be added in the step, an ionic (anionic or cationic), amphoteric or nonionic surfactant, or a fluorine-based, silicon-based or polymer-based surfactant or a polymer compound is added. be able to.

For example, as the anionic surfactant, higher fatty acid salt, higher alkyl dicarboxylate, higher alcohol sulfate, higher alkyl sulfonate, higher fatty acid and amino acid condensate, sulfosuccinate ester salt,
Examples include naphthenate.

Examples of the cationic surfactant include an aliphatic amine salt, a quaternary ammonium salt, a sulfonium salt and a phosphonium salt. Specific examples thereof include octadecylamine acetate, alkyltrimethylammonium chloride and polyoxyethylene octadecylamine. , Polyoxyethylene alkylamines, polymeric amines, and the like. The surfactant is a betaine type such as dimethylalkyl betaine.

As the nonionic surfactant, a fatty acid ester type of polyoxyethylene compound, a polyethylenoxide condensation type or the like can be used.

The non-polar insulating solvent used as the ink solvent drying component is a branched aliphatic hydrocarbon solvent, preferably having a molecular weight of 190 or less, specifically, Isopar manufactured by Exxon Co., Soltor manufactured by Philippe Petroleum Co., Idemitsu. For Petrochemical's IP solvent, Petroleum Naphtha, S.P. B. R. , Shelsol, Vegasol of Mobil Oil Co., and the like.

As the non-polar insulating solvent used as the ink solvent non-drying component, aromatic solvents such as terpene phenol, glycols such as aliphatic hydrocarbon ethylene glycol having 9 or more carbon atoms, glycerin, rapeseed oil, Fats and oils such as castor oil, higher alcohols, plasticizers and the like can be mentioned.

In the apparatus of the present invention, recording is performed at a speed of about 1 to 50 (pages / minute). The ink solvent drying component that constitutes the ink is an ink medium that is largely dried and removed from the surface of the transfer medium within the time of the recording process at such speed. The ink solvent non-drying component is a solvent that has a lower drying property than the ink solvent drying component, and most of it does not dry and remains on the transfer medium surface within the time of the recording process.

The properties required for the non-polar insulating solvent used as the ink solvent drying component and the ink solvent non-drying component are low toxicity, low flammability, and low odor. is there.

An example of an inkjet ink constituted by using the above-mentioned ink composition will be described together with a manufacturing method.

Inkjet Ink Example 1 The manufacturing process of the inkjet ink is as follows.

Step 1 100 parts by weight of Isopar G, 10 parts by weight of commercially available stearyl methacrylate, 6 parts by weight of acrylic acid and 6 parts by weight of vinylpeviridine were put into a polymerization tube, heated to 60 ° C. and stirred for 24 hours to obtain an average molecular weight (weight: (Reference) 16000 of a copolymer resin solution of stearyl methacrylate and acrylic acid is obtained, and this is referred to as solution A.

Next, 20 parts by weight of MA-100 manufactured by Mitsubishi Kasei Co., Ltd. was added to the solution A obtained in the above step, and the solution A was thoroughly dried to carbon black, and then an ultrasonic disperser (manufactured by Nippon Seiki Co., Ltd.) was used. , Form RUS-300) to disperse carbon black to the primary particle size. Further, the above-mentioned dispersion liquid is circulated in a horizontal type mill (EIGER ENGINEERING LIM
ITED beads mill) 0.9 mm beads, 5000
The dispersion was carried out at rpm for 1 hour to obtain a dispersion B having an average particle diameter of pigment of 2 μm.

Step 2 To 76 parts by weight of Isopar G, 2.5 parts by weight of stearyl methacrylate, 1.5 parts by weight of acrylic acid and 1.5 parts by weight of vinyl pepyridine were added, and the mixture was stirred at a temperature of 60 ° C. for a whole day and night, and averaged. A copolymer resin solution of stearyl methacrylate and acrylic acid having a molecular weight (weight basis) of 16000 was obtained. Then, 2 parts by weight of sorbitan trioleate was added and dissolved to obtain a solution C.

Next, the dispersion B obtained in the step 1 is stirred with a stirrer H.
Solution C was gradually added while stirring with I-15 Tokyo Rikiki Co., Ltd., and the copolymer resin of stearyl methacrylate and acrylic acid in the solution C was completely adsorbed on the dispersion pigment to obtain a solution D. .

Next, 74 parts by weight of terpene phenol, which is a non-drying component of the ink solvent, is added to obtain the desired ink jet ink.

An ink having a viscosity of 20 mPaS was obtained with the above composition.

Example 2 of Inkjet Ink The ink composition is as follows.

Composition of Solution A: The dissolved resin is a lauryl methacrylate-styrene copolymer resin and is composed of the following:

[0058] An ink having a viscosity of 20 mPaS was obtained with the above composition.

The ink manufacturing method was prepared in the same steps 1 and 2 as those in Ink Example 1. In the inkjet ink of Ink Example 2, no dispersion stabilizer was added in step 2.

The average molecular weight (weight average) of the lauryl methacrylate-styrene copolymer resin of solution A was 2300.
0, the average molecular weight (weight average) of the solution of stearyl methacrylate-methacrylic acid copolymer resin was 14,000.

Desirably, the inkjet ink having the above composition has a ratio of (coloring material solid component weight) / ((ink solvent non-drying component weight) + (coloring material solid component weight)) of 0.3.
It is in the range of 5 to 0.45. At this time, the ink image on the transfer medium obtained after the ink solvent drying component in the ink is dried on the transfer medium is composed of the ink solvent non-drying component and the coloring material solid component, and the solid content concentration is 35 to 45%. Is. With this solid content concentration, high-quality transfer can be performed at low pressure.

Next, a recording apparatus using the inkjet ink of the present invention will be described.

FIG. 1 and FIG. 2 show an ink jet printer of one embodiment. FIG. 1 is a perspective view.

This ink jet printer is constructed such that an ink image is formed on the outer periphery of the transfer drum 1 which is a transfer medium without contacting the pressure roller 9, and thereafter, is transferred onto the recording paper 8 which is a recording medium.

Further, a cleaner device 3 is provided around the transfer drum 1, and a drying device 4 is arranged on the transfer drum 1 to accelerate evaporation of the ink solvent drying component from the ink image. The pressure roller 9, the cleaner blade 5 of the cleaner device 3, and the drying device 4 can control contact and release with respect to the transfer drum 1.

In the ink image forming process on the transfer drum 1, these are separated from each other.

In the transfer process from the transfer drum 1 to the recording paper 8, the pressure roller 9 is brought into contact and the recording paper 8 is pressed from behind. Further, the drying device 4 and the cleaner blade 5 are brought into contact with the portion of the transfer drum 1 where the transfer is completed. In FIG. 1, the solid line shows the position of the pressure roller 9 in the ink image transfer process, and the broken line shows the position 9-b of the pressure roller in the ink image forming process.

The transfer drum 1 is constructed by providing an elastic layer 17 around the metal tube 16.

The recording head 2 selectively ejects ink as ink droplets from a plurality of nozzles according to a recording signal.

This apparatus is an apparatus for recording at a pitch of 1/300 inch. The recording head 2 has a plurality of nozzles aligned in the axial direction of the transfer drum 1 and arranged at a pitch of 8 × 1/300 inches. During recording, the recording head oscillating means 25 oscillates the recording head 2 in the axial direction of the transfer drum 1 (indicated by the arrow H in FIG. 1) in synchronization with the rotation of the transfer drum 1.

The transfer drum 1 which is a transfer medium is a metal tube 1.
An elastic layer 17 is provided around the circumference of the wire 6. Elastic layer 17 has a layer thickness of 1 m
m urethane rubber layer is coated with a fluororesin coat having a thickness of 3 μm. Since the elastic layer 17 has elasticity, the ink image can be transferred onto the recording paper by following the irregularities of the recording paper, and the ink image has good releasability and is suitable as a transfer medium for the transfer drum 1. There is.

The drying device 4 has a heater lamp 6 having a rod-shaped halogen lamp inside, and heats an ink image by reflecting and condensing light energy by a reflecting plate 10, and the ink image is transferred from the ink image on the transfer drum 1 to an ink solvent. The dry ingredients are volatilized and removed.

The scanning operation during recording will be described with reference to FIG. FIG. 2 is a view seen from the direction of arrow G in FIG. For simplification of description, the case where the recording head 2 has three nozzles is illustrated. By rotating the transfer drum 1 in the direction of arrow A at a constant speed and moving the recording head 2 in the direction of arrow H, recording is performed in the belt-shaped area using each nozzle. At this time, the speed is set so that the transfer drum 1 makes one rotation when the recording head 2 moves 1/300 inch in the H direction. Figure 2
Shows the state when the swing amount of the head reaches M. A state is shown in which recording is performed in the area indicated by 62 on the transfer drum 1 by the first nozzle 61 of the recording head 13 (the second nozzle and the subsequent nozzles are the same, so description thereof is omitted).

By swinging the distance M until it matches the distance K, the required printing scan is completed, and printing is performed over the entire printing area. After the image recording is performed on the transfer drum 1 in this manner, the transfer drum 1 and the pressure roller 9 are brought into contact with each other, pressure is applied, and the recording paper 8 is passed through this contact portion.
The ink image on the transfer drum 1 is transferred onto the recording paper 8 by the applied pressure.

After the transfer step, the transfer drum 1 removes the ink solvent drying component by the drying roller 4 located on the downstream side of the pressure roller 9, and further cleans the transfer residual ink image by the cleaner device 3 and then forms an image. Prepare for the process.

The above-mentioned image forming process is performed in 6.8 seconds for one page, and is performed in the following sequence.

(1) Preparation sequence Required time t1 = 1.8 seconds Transfer drum 1 is accelerated and rotated at a constant speed (2) Ink image formation sequence Required time t2 = 3.7
The second recording head 2 forms an ink image on the transfer drum 1 in a predetermined recording area. The transfer drum 1 requires 0.46 seconds for one rotation, and the entire recording area is scanned by rotating the transfer drum 1 eight times. Therefore, this step requires 3.7 seconds. (3) Transfer sequence Required time t3 = 1.3 seconds The ink image is concentrated on the transfer drum 1, and then the recording paper 8 is brought into contact with the transfer drum 1, Transfer the ink image above. In this step, the time required for moving from the position facing the recording head 2 to the transfer position is added to 0.46 * (1+
3/4), and the time required for transporting the recording paper that has been transferred to a predetermined recording paper storage location outside the apparatus including 0.5 seconds. As apparent from the above, the ink formed last on the transfer drum 1 Since the image immediately enters the transfer step, the concentration time required for transfer is approximately 0.5 seconds. The concentration time required for transfer of the ink image formed first on the transfer drum 1 corresponds to about t2 + 0.5 seconds, which is about 4.2 seconds.

In this apparatus, ink is ejected from the recording head 2 in a low viscosity state. Transfer drum 1
Above the desiccant component of the ink solvent dries and is removed from the ink image. On the transfer drum 1, the ink image is composed of the solid content of the colorant and the non-drying component, and this viscous state is kept stable for a long time. Therefore, the transfer is performed in an appropriately low-viscosity state, and high-quality transfer can be stably performed at a low pressure without causing a difference in transfer characteristics depending on a place.

Ink composition of ink jet ink example 1
The case will be described. Ink ejection is similar to the above description.
The amount of ink is 0.06 μg per dot. From the ink composition described above, the ink solvent drying component is 0.035 μg per dot. By the drying device 4, the ink solvent drying component is quickly dried on the transfer drum 1 and removed from the ink image. Non-drying component of ink solvent 0.0
14 μg and 0.009 μg of the solid material of the coloring material remain on the surface of the transfer drum. As a result, the solid content concentration becomes 39%. Since the non-drying component in the ink image does not dry on the transfer drum 1, it remains on the transfer drum 1 and the solid content concentration is stably maintained until the transfer step. This characteristic is shown in FIG.
The total amount of the ink solvent drying component, 0.035 μg, is quickly evaporated and removed, and the drying does not proceed beyond this state, and the proper solid content concentration is maintained. Therefore, a high-quality image can be obtained at a low pressure without causing transfer unevenness.

Although the above-mentioned embodiment shows an example of an ink-jet ink using an insulating solvent, the ink-jet recording method of the present invention can also be applied to a water-based ink containing water as a main solvent. . As such an inkjet ink, an ink having the following composition can be used.

[0081]

[0082]

According to the ink-jet ink of the present invention, the ink is in a low viscosity state when ejected from the recording head, and good ejection characteristics are obtained. The ink image formed by this ink is transferred onto the transfer medium. The dry component in the solvent is promptly removed, and an appropriately viscous ink image composed of the non-dry component and the solid component of the coloring material is formed on the transfer medium. Since the non-drying component remains in the ink image stably for a long time, the ink image on the transfer medium is kept in a constant viscous state. By transferring while the viscous state is maintained, the ink image transfer on the transfer medium can be transferred to the recording medium at a low pressure without causing transfer unevenness depending on the location.

Therefore, when ejected onto the transfer medium, good ejection characteristics are realized, and further, the transfer from the transfer medium to the recording medium can be carried out with a small transfer pressure, and further, stable regardless of the place. Thus, it is possible to obtain a high quality ink image.

[Brief description of drawings]

FIG. 1 is a perspective view of an inkjet printer using an inkjet recording method of the present invention.

FIG. 2 is a diagram illustrating an operation of a scanning mechanism of an inkjet printer using the inkjet recording method of the present invention.

FIG. 3 is a diagram showing a relationship between a reduction amount of an ink solvent dry component on a transfer medium due to drying and a solid content concentration in an inkjet printer using the inkjet recording method of the present invention.

FIG. 4 is a diagram illustrating transfer characteristics from a transfer medium to a recording medium according to a conventional technique.

FIG. 5 is a diagram showing a relationship between a reduction amount of a dry component of an ink solvent on a transfer medium due to drying and a solid content concentration in a conventional technique.

[Explanation of symbols]

 1 Transfer Drum (Transfer Medium) 2 Recording Head 4 Drying Device 6 Heater Lamp 8 Recording Paper (Recording Medium) 9 Pressure Roller

Claims (2)

[Claims] 1. An inkjet ink used in an inkjet recording method for transferring an inkjet ink image formed on a surface of a transfer medium to a recording medium to obtain an ink image on the recording medium, wherein the inkjet ink is a vehicle. The vehicle is composed of a formula material solid component consisting of a pigment or a dissolved dye dispersed in a vehicle. An ink for inkjet recording, comprising: 2. Using the recording ink according to claim 1,
In an inkjet recording method of transferring an inkjet ink image formed on a surface of a transfer medium to a recording medium to obtain an ink image on the recording medium, (1) forming an ink image on the transfer medium with the ink droplets. And (2) a step of removing the ink solvent drying component from the ink image on the transfer medium, and (3) a removal of the ink solvent drying component to give a solid coloring material component and an ink solvent drying component. And a step of transferring an ink image comprising the above from the transfer medium to a recording medium, and the inkjet recording method.