JP2003096348A - Ink jet ink composition, ink jet recording method, and ink- on record print - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an ink jet ink composition which has high density and chroma, can well transfer an ink jet image alone to a wide variety of substrates without causing the problem of cockling, or the like, and gives a transferred ink jet image with an adequate strength; and an ink jet recording method and an ink-on record print using the same. SOLUTION: The ink jet ink composition at least contains water and dispersed particles and forms a primary image on a layer having micropores smaller than the diameters of the dispersed particles. The primary image is transferred to a recording medium to give a secondary image. The maximum C* value of the primary image at a hue angle of 225 deg. is larger by at least 2 than that of the primary image.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an inkjet ink composition (hereinafter, also simply referred to as an inkjet ink, an ink composition or an ink), an inkjet recording method and an ink-on recording printed matter, and more specifically, a specific inkjet recording intermediate transfer. By using a medium, an inkjet ink composition having a high density and high saturation, capable of satisfactorily transferring only an inkjet image to a wide range of substrates without problems such as cockling, and having a sufficient strength of the inkjet image after transfer, inkjet recording The present invention relates to a method and an ink-on recording printed matter.

[0002]

2. Description of the Related Art The ink jet recording method is non-contact recording, can be used for small recording equipment to large equipment, and can be easily colorized. Therefore, it is widely used for personal use to industrial use. .

Ink jet recording is roughly classified into a continuous jet type and an on-demand type. The former has been used for industrial printers, and the latter has been mainly used for personal use and OA use. In recent years, on-demand type liquid droplets have been made smaller and high-speed printing performance has been improved, and the on-demand type has been used for industrial purposes.

As the ink as a recording liquid, solvent type and water type inks have been proposed, but water type inks are widely used except for some industrial uses.

A system using such a water-based ink is being studied for application to a photograph application, a color proof application, and the like with the recent improvement in image quality. In addition, the accuracy of related technologies such as color matching has improved, and it has been used as an out-school for proofing applications that require a strict color reproduction range.As a result, high-density and high-saturation output quality that closely resembles printing is required. Is coming.

For printing proofreading purposes, various methods such as a laser melting heat transfer method, a laser sublimation heat transfer method, a laser ablation transfer method, and a silver salt method have been studied and commercialized, but all of them are very expensive in system price. It has not reached the point of sweeping the market.

[0007] A comparison of existing premium systems with current inkjet products allows the use of printing paper. Halftone dots can be output. The current situation is that the output speed is fast.

On the other hand, the ink jet system has the advantages that the apparatus is simple, the system price can be greatly reduced, and the running cost can be made very low, and there is a possibility that it will greatly increase as the quality is improved.

In order to fill the above difference, each company is examining it, and in particular, the inkjet paper which is similar to the printing paper is being developed one after another by each paper manufacturer, and matte paper, coated paper, etc. The situation is getting closer to quality.

However, lightweight coats and lightweight matte papers,
No inkjet recording paper targeting newspaper has been proposed.

This kind of inexpensive system is a field expected to be applied to printing papers used for leaflets and magazines such as lightweight coats, lightweight matte papers, newspapers, etc. Inkjet recording uses liquid as recording papers. Since the ink is ejected, there is a problem that when it is output on thin paper, essentially sufficient image quality cannot be obtained due to problems such as cockling (so-called “wrinkle”) and overflow.

As an effective technique for such a problem,
Conventionally, a method using an intermediate transfer medium has been proposed,
JP-A-62-92849 and JP-A-1-22633.
No. 6 discloses a method of suppressing the permeation into paper by adhering the ink to an intermediate transfer medium, evaporating the water content of the ink by heating and concentrating it, and then contacting the intermediate transfer medium with a recording medium by pressing and transferring it. Has been done. According to this, it is possible to improve the blurring of the image and the strike-through on the paper. However, in the process from the discharge of the ink to the intermediate transfer to the transfer to the recording medium, the ink droplets gather and become a spherical shape, which increases the dot diameter and lowers the resolution, or the image is not held at the correct position. There was a problem. Further, when inks of different colors are ejected adjacent to each other, not only color mixing occurs, but also the presence of the ink ejected earlier causes spattering of repelling the next ink, resulting in deterioration of image clarity. There was a problem.

With respect to the above problems, Japanese Patent Laid-Open No. 5-2009
Japanese Patent Publication No. 99 discloses an apparatus having an intermediate transfer medium having a filter layer that absorbs only an ink solvent. According to this, resolution reduction, color mixing, and spatter can be improved. However, these methods of separating the coloring material and the solvent of the water-based ink image droplets on the intermediate transfer medium have two major problems. That is, “1) Most of the composition of the water-based ink is a solvent and a coloring material, and when the solvent is evaporated / concentrated, volume contraction occurs and the transferability to a transfer target is deteriorated. There is a problem that high quality images cannot be obtained due to aggregation / precipitation of material components. ”It is difficult to provide high density, high saturation inkjet recording to a wide range of base materials of each species. It was

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is high density, high saturation, good ink jet images on a wide range of substrates without problems such as cockling. It is an object of the present invention to provide an inkjet ink composition, an inkjet recording method, and an ink-on recording printed matter, which can be transferred to an inkjet recording medium and have sufficient strength of an inkjet image after the transfer.

[0015]

The above object of the present invention can be achieved by the following constitutions.

1. An inkjet ink composition containing at least water and dispersed particles, wherein a primary image formed on a layer having pores smaller than the diameter of the dispersed particles and a secondary image obtained by retransferring the primary image to a recording medium An inkjet ink composition, wherein a maximum C ^* value at a hue angle of 225 ° of an image is larger by 2 or more in a secondary image than in a primary image.

2. 2. The inkjet ink composition as described in 1 above, wherein a heat treatment is performed at the time of the retransfer.

3. 3. The inkjet ink composition according to 1 or 2 above, wherein the dispersed particles are colored particles having thermoplasticity.

4. Inkjet recording on an intermediate transfer medium using an inkjet ink composition containing at least water and colored particles having thermoplasticity, removing volatile components of the ink sprayed on the intermediate transfer medium, and intermediate transfer An ink jet recording method, wherein an image is formed by a step of retransferring the components remaining on the medium to the medium to be transferred.

5. 5. The inkjet recording method as described in 4 above, wherein the step of removing the volatile component is performed simultaneously with the step of inkjet recording.

6. Inkjet recording on an intermediate transfer medium having pores having an average particle size of the colored particles or less using an inkjet ink containing at least water and colored particles having thermoplasticity, and a component remaining on the intermediate transfer medium An image is formed by a step of retransferring the image to a transfer medium.

7. 7. The ink jet recording method according to the above 6, wherein the liquid transfer amount of the 25% aqueous solution of ethylene glycol defined by the Bristow method of the intermediate transfer medium after 1 second is 5 to 200 ml / m ² .

8. 8. The ink jet recording method according to 6 or 7, wherein the surface roughness Ra value of the intermediate transfer medium is 0.01 to 1 μm.

9. 9. The inkjet recording method according to any one of 6 to 8 above, wherein the outermost layer of the intermediate transfer medium is a metal vapor deposition layer.

10. 10. The inkjet recording method according to any one of 4 to 9 above, wherein the colored particles having thermoplasticity are microcapsules having a core-shell structure.

11. 11. The inkjet recording method described in 10 above, wherein at least a dye and a thermoplastic resin are contained in a core portion of the microcapsule having the core-shell structure.

12. 11. The inkjet recording method described in 10 above, wherein the core portion of the microcapsule having the core-shell structure contains at least a pigment and a thermoplastic resin.

13. 11. The inkjet recording method described in 10 above, wherein the core portion of the microcapsule having the core-shell structure contains at least a dye-pendant thermoplastic resin.

14. 10. The thermal deformation start temperature of the microcapsules is 50 to 150 ° C.
14. The inkjet recording method according to any one of claims 1 to 13.

15. The maximum C at the hue angle of 225 ° of the ink-on recording printed matter on Tokubishi Art [Mitsubishi Paper Mills: 127.9 g / m ² ] produced by the inkjet recording method described in any one of ^{4 to} 14 above. ^* Value is 50 or more 10
An ink-on-recorded printed matter, which is less than 0 and has a 60 ° gloss of 37 ± 10% in the image portion defined by JIS-K7105.

The present invention will be described in detail below. (Inkjet Ink Composition) The inkjet ink composition of the present invention contains at least water and dispersed particles.

The dispersed particles referred to in the present invention refer to pigments, disperse dyes, and colored particles, and colored particles are preferable among them.

Japanese Patent Application No. 2001-115, wherein a thermoplastic resin emulsion is added to a conventionally known pigment disperse dye.
Polymer coated particles of the pigment particles described in 194 can also be preferably used.

The thermoplastic resin particles preferably used for the polymer coat preferably have a melting point of 30 ° C. or higher, more preferably 40 ° C. or higher in order to stabilize the liquid properties at room temperature. Examples of the thermoplastic resin include poly (meth) acrylic acid, polyethylene glycol, polyethylene, polypropylene, polyvinyl acetate, polyvinyl acetal, polymethacrylic acid ester, polyacrylic acid ester, polyether, polyester, polycarbonate,
Cellulosic resin, polyacrylonitrile, nylon,
Examples thereof include polyimide, polyamide, polyvinyl chloride, polyvinylidene chloride, polystyrene, thiochol, polysulfone, polyurethane, and copolymers of these resins. Among them, poly (meth) acrylic acid, polyethylene glycol, polyethylene, polypropylene, polyvinyl acetate, polyvinyl chloride, nylon and polyurethane are more preferably used. Two or more kinds of these materials may be mixed and used to form polymer coated particles of pigment particles, or two or more kinds of polymer coated particles of pigment particles may be mixed and used.

Among them, the preferable colored particles are a system in which the water-dispersible resin is colored with an oil-soluble dye or a hydrophobic dye, and a preferable example is, for example, Japanese Patent Application No. 2001-11.
The polymer core containing the coloring material according to 5194 such that the coloring material content of the polymer shell is 0.8 or less of the coloring material content of the polymer core, and the volume average particle diameter is 5 nm or more and 500 nm or less; Examples thereof include a colorant-containing fine particle composed of a polymer shell, and particularly preferably, for example, a polymer core containing the colorant described in Japanese Patent Application No. 2001-146067 and a polymer shell having a colorant content smaller than that of the core. , The volume average particle diameter is 5 nm or more, 5
Examples include fine particles containing a coloring material having a particle size of 00 nm or less.

In addition to the ink composition of the present invention,
It may contain an aqueous solvent, a dispersant, an antifoaming agent, an antifungal agent, an oxygen absorbent and the like.

The ink jet ink composition of the present invention comprises
An inkjet ink composition containing at least water and dispersed particles, wherein a primary image formed on a layer having pores smaller than the diameter of the dispersed particles and a secondary image obtained by retransferring the primary image to a recording medium The maximum C ^* value at the hue angle of 225 ° of the image is 2 in the secondary image value than in the primary image value.
One of the features is that it is large.

The inkjet ink composition of the present invention comprises
Maximum C at a hue angle of 225 °^*Value is the primary image and the primary image
The secondary image retransferred to the recording medium is 2 more than the primary image.
Ink jet that is larger (that is, recovers 2 or more)
Any ink composition may be used. Greater than 3
Are preferred, and those that are 5 or more are particularly preferred.
Good If it is less than 2, the recovery range of saturation is small and
It is insufficient as the desired high-quality image. Maximum C
^*The upper limit of the value is not particularly limited, but the printing color L^*a ^*b^*space
It is less than 100 from the reproduction range of.

The dispersed particles of the present invention have a particle size of preferably 0.01 to 1 μm, more preferably 0.03 to 0.5 μm.
m, particularly preferably 0.05 to 0.3 μm. 1μ
If it exceeds m, the dispersion stability of the liquid is poor, and if it is less than 0.01 μm, the light resistance of the image tends to be poor, which is not preferable.

The dispersed particles of the present invention preferably have thermoplasticity. In the present invention, the dispersed particles having thermoplasticity are not limited to the case where the entire particles are thermoplastic, and the particles are thermoplastic. It means that it is constituted by containing components, and the content of the dispersed particles is preferably 10% by mass or more, more preferably 20% by mass or more, and particularly preferably 50% by mass or more. If the particles are formed in such a ratio, the coloring material and the thermoplastic component may be compatible or separated, and if separated, it is preferable that they are integrated with the coloring material, It is preferable that the coloring material is coated with a thermoplastic component.

The term "having thermoplasticity" as used in the present invention means that
It means that it has a heat softening property within a practical range, and particularly that it shows a softening property at the heating temperature when heat treatment is performed during retransfer.

The dispersed particles of the present invention preferably have thermoplasticity and heat softening property, and have a TMA softening point of 50 to 15.
It is preferably 0 ° C., more preferably 60 to 13
The temperature is 0 ° C, particularly preferably 70 to 110 ° C. If the temperature is lower than 50 ° C, the liquid storability may be deteriorated. Also, 150 ℃
If it exceeds the range, a high temperature is required when the primary image is retransferred to the recording medium to form a secondary image, and the transferability may be deteriorated.

The TMA softening point is TMA (Thermo
It is measured by mechanical analysis). The TMA softening point is obtained by observing the phase of the measurement target object while raising the temperature of the measurement target object at a constant heating rate while applying a constant load. In the present invention, the temperature at which the phase of the measurement object begins to change is defined as the TMA softening point. The softening point is measured by TMA using Thermo
It can be performed using a device such as flex (manufactured by Rigaku Denki Co., Ltd.). For example, Thermoflex is used, the measurement temperature range is 25 to 200 ° C., and the temperature rising rate is 5 ° C./min.
Then, when a load of 10 g is applied to a quartz glass pin (needle) having a diameter of 1 mm, the temperature begins to change with the TM
A softening point.

The dye-pendant thermoplastic resin preferably used in the present invention is a resin in which a chromophore having an absorption at 400 to 700 nm is bound to a polymer compound having a molecular weight of 1000 or more by a covalent bond or an ionic bond. As the polymer compound, conventionally known compounds are preferably used, and among them, a thermoplastic polymer compound is preferable. (Intermediate Transfer Medium) The intermediate transfer medium of the present invention has at least an ink absorbing layer and a layer having pores smaller than the diameter of dispersed particles on a support in this order. (Support) As the support used for the intermediate transfer medium,
Conventionally known supports can be used without particular limitation. The thickness is preferably 6 to 200 μm, more preferably 25 to 125 μm.

As the support, for example, paper, coated paper,
Various papers such as synthetic paper (polypropylene, polystyrene, or composite materials obtained by laminating them with paper), vinyl chloride resin sheet, ABS resin sheet, polyethylene terephthalate film, polybutylene terephthalate film, polyethylene naphthalate film, polyarylate Films, polycarbonate films, polyetherketone films, polysulfone films, polyethersulfone films, polyetherimide films, polyimide films, polyethylene films, polypropylene films, polystyrene films, stretched nylon films, polyacetate films, etc., single layers or them Various plastic films or sheets in which two or more layers are laminated, films or sheets formed of various metals, and various ceramics I made a film or sheet, further, aluminum, stainless steel, chromium, metal plate such as nickel, followed by a metal thin film to the paper was resin coated and laminated or deposited. Of these, paper is preferable from the viewpoint of preventing bleeding due to absorption of the ink solvent overflowing from the ink absorbing layer.

These supports may be subjected to various processes such as dimensional stabilization and antistatic treatment. As the antistatic agent, in addition to cationic surfactants, anionic surfactants, nonionic surfactants, polymeric antistatic agents, conductive fine particles, “11290 chemical products”, Chemical Industry Daily, 87
The compounds described on pages 5 to 876 can be widely used.

Conventionally known surface modification techniques can also be preferably used. Examples of the adhesion treatment for improving the adhesion include flame radiation treatment, sulfuric acid treatment, corona discharge treatment and plasma treatment. It is also preferable to use a support in which the adhesive layer has been applied in advance.

Of these, corona discharge treatment and introduction of an adhesive layer are particularly preferable. The output power of the support membrane surface during corona discharge treatment is preferably ²⁰ to 80 W / m ² , and particularly preferably 30 to 70 W / m ² .

As the adhesive layer, a conventionally known adhesive layer can be used without particular limitation. Examples of the method for providing the adhesive layer include water-based resin coating, solvent-based resin coating, water-based latex coating, hot melt coating and the like.

As the design of the adhesive layer, 1) one having physical properties intermediate between the solubility parameters of the support and the upper layer is selected.
2) Select a support and an upper layer containing a reactive group. 3) It can be set as appropriate, for example, by selecting substances having different tackiness / sliding properties.

Generally, it is advantageous to provide an adhesive layer at the time of preparing the support from the viewpoint of cost and stability. From this point, for example, acrylic resin, polystyrene resin, polyester resin, urethane resin, polyethylene / A method of coating a latex such as vinyl acetate resin is preferable, but not limited thereto.

Film bases with such an adhesive layer are available from various companies, and these can be preferably used. For example, W-900E, W-900J, W-400
J, T-100E, T-600E, S410E, S11
0G, T600G, H100C, H500, H160L
(Made by Mitsubishi Polyester Corporation), P60, Q80, Q8
1, Q82, Q83, Q27, P51, P52, P52
5, P025, S90, S91, S92, S94, S9
5, T90, T91, T94, T95, T98, T9
9, U94, U98, U99, X94 (all manufactured by Toray), UL9, U51L74, U51LY (all manufactured by Teijin), 535, 705, 505, 339, 330, 53
4 (above made by DuPont) and the like.

In the intermediate transfer medium, the surface roughness Ra value of the support is preferably 10 nm to 5 μm, more preferably 15 n.
The thickness is preferably m to 3 μm, and particularly preferably 20 nm to 1 μm from the viewpoint of improving the adhesiveness between the thermal deformation layer and the lower layer or the support due to the anchor effect. Further, the above Ra
Setting the value to a value is preferable from the viewpoint of image defects when the fluidity of the heat deformable layer is increased and the unevenness followability of the final image bearing member is improved.

In the present invention, the surface roughness Ra of the support is specified by a surface roughness meter (manufactured by RST / PLUS WYCO).

From this point of view, as the support, those in which the amount of the matting agent is positively added for the purpose of improving the slipperiness, those obtained by sandblasting, and those obtained by embossing can be preferably used.

A white support in which a white pigment or the like is kneaded is very preferable in that the target surface roughness can be stably obtained due to the presence of uniform fine particles.

On the other hand, since the intermediate transfer medium thermally transfers the image to the final image carrier, it is important in handling that the front side and the back side can be easily discriminated when the image is formed on the ink absorbing layer. From this point, among the white supports, CIE
When defined by the lightness index L ^* in the color space and the perceptual chromaticity indices a ^* and b ^* , the L ^* of the support is preferably 60 or more, and more preferably 80 or more. Also, a ^* , b ^*
For a ^* : -10 to +10, b ^* : -10 to +1
0 is preferable, and a white support having a ^* : -5 to +5 and b ^* : -5 to +5 is a more preferable embodiment.

The L ^* a ^* b ^* values specified in the present invention can be measured using a Gretag SPM-100 and a standard black backing for color measurement. (Ink Absorption Layer) The ink absorption layer is below the layer having pores, absorbs the ink solvent component of the inkjet ink recorded on the intermediate transfer medium (layer having pores), and is dispersed particles (coloring). The feature is that the (particle) component is left on the layer having pores (intermediate transfer medium).

In order to obtain good recording quality, the ink absorbing layer has a liquid transfer amount of 5 to 200 ml / m ² after a contact time of 1 second with a 25% aqueous solution of ethylene glycol in the liquid absorbing test by the Bristow method. Is preferred,
The liquid transfer amount after 0.5 seconds is more preferably 5 to 200 ml / m ² , and the liquid transfer amount after 0.3 seconds is 5 to 20 ml / m ^2.
Particularly preferred is 0 ml / m ² . In addition to the above liquids, it is preferable that they have a high absorbability with respect to a wide range of aqueous solvents.

The liquid absorption test by the Bristow method in the present invention (see J. TAPPI paper pulp test method No. 51 for details) was determined by adding 15 μl of 25% ethylene glycol aqueous solution to the head box. It indicates the amount of transfer in 1 second, and a liquid dynamic absorption tester manufactured by Kumagai Riki Kogyo Co., Ltd. is used as a Bristow tester.

No transparency is required for the ink absorbing layer.
For this reason, it is possible to use a conventionally known paper as the ink absorbing layer, which also serves as the support. For such paper,
JIS P-, except that the ashing treatment was performed at 500 ° C for 4 hours
Ash measured according to 8126 (hereinafter abbreviated as ash)
Is 10% or more, and the 10 second sizing degree (hereinafter abbreviated as sizing degree) according to the Cobb method defined in JIS P-8140 is preferably 7 to 50 g / m. here,
When the ash content is less than 10% or the sizing degree is less than 7 g / m, the ink absorptivity is lowered, and the ink flows out and bleeds at the portion where the print dots overlap. If the size is larger than 50g / m,
The binder in the ink receiving layer penetrates into the inside of the base paper, and a satisfactory coating layer strength cannot be obtained.

The support used for the ink absorbing layer is mainly composed of wood pulp and pigment. As wood pulp, chemical pulp such as LBKP and NBKP, GP, P
Examples include mechanical pulp such as GW, RMP, TMP, CTMP, CMP and CGP, and waste paper pulp such as DIP. Furthermore, non-wood pulp such as kenaf, bacas, bamboo, cotton, etc. can be used. Fillers and binders, and sizing agents, fixing agents, retention aids, cationizing agents, paper-strengthening agents, and various other additives are mixed together and used to produce fourdrinier paper machines, cylinder paper machines, and twin-wire paper machines. Machines, on-top paper machines, hybrid paper machines, and other devices can be used to produce base paper, and can be made acidic, neutral, or alkaline. Further, the ink absorbing layer may be directly provided on the base paper, or the ink receiving layer may be provided after a size press of starch, polyvinyl alcohol or the like or an anchor coat layer is provided.

In addition, since the ink absorbing layer is not required to have thermoplasticity, it is more preferable to use a binder having high hydrophilicity. For example, a conventionally known hydrophilic resin can be used as a binder. Examples thereof include starch and other derivatives, alginic acid and its derivatives, dextrin and its derivatives,
Gum arabic, methyl cellulose and its derivatives, CM
Natural or semi-synthetic polymers such as C and other derivatives, hydroxyethyl cellulose and other derivatives, casein. Examples thereof include synthetic polymers such as polyvinylpyrrolidone-based resins and melamine resins.

From the viewpoint of improving the water absorption of the ink, it is preferable to add a filler in addition to the above binder for use. Examples of the filler that can be preferably used in the present invention include pigments, for example, aluminum hydroxide, alumina, amorphous silica, magnesium oxide, colloidal silica, colloidal alumina, calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, Inorganic pigments such as titanium dioxide, zinc oxide, zinc carbonate, satin white, aluminum silicate, calcium silicate, magnesium silicate, white carbon, styrene type, acrylic type,
Urea resin-based, melamine resin-based, and benzoguanamine resin-based organic pigments can be used.

As the filler, thermoplastic resin particles can be used, and examples thereof include polyethylene, polypropylene, polyvinyl acetate, polyvinyl acetal, polymethacrylic acid ester, polyacrylic acid ester, polyether, polyester, polycarbonate, cellulose resin, poly Examples thereof include acrylonitrile, nylon, polyimide, polyamide, polyvinyl chloride, polyvinylidene chloride, polystyrene, thiochol, polysulfone, polyurethane, and copolymers of these resins. Among them, fine particles made of polyethylene, polypropylene, polyvinyl acetate, polyvinyl chloride, nylon, acrylic, polyurethane and the like are more preferably used. Particularly preferred are polyvinyl chloride, acrylic and polyurethane. Further, fine particles formed by mixing two or more kinds of these materials, or two or more kinds of fine particles may be mixed and used. Among these, the use of particles having a softening point of 40 to 120 ° C. is preferable, and the use of particles having a softening point of 50 to 100 ° C. is particularly preferable.

Specific examples of such an absorption layer include a conventionally known void type ink absorption layer.

The void-type ink absorbing layer has voids in the ink absorbing layer, and is preferably a porous film having voids containing inorganic fine particles and a small amount of hydrophilic polymer. Examples of such inorganic fine particles include, for example, light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, clay, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc hydroxide, zinc sulfide,
White color of zinc carbonate, hydrotalcite, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic amorphous silica, colloidal silica, alumina, colloidal alumina, pseudo-boehmite, aluminum hydroxide, lithopone, zeolite, magnesium hydroxide, etc. Inorganic pigments and the like can be mentioned. Such inorganic fine particles can be used as the primary particles as they are, or can be used in the state of forming secondary aggregated particles.

In the present invention, synthetic amorphous silica, colloidal silica or pseudo-boehmite is preferable from the viewpoint that particularly fine voids can be formed, and the average particle size (meaning the average particle size of primary particles) is 100 nm or less. The silica, colloidal silica and pseudo-boehmite synthesized by the gas phase method are preferable. Furthermore, silica synthesized by a vapor phase method having an average particle diameter of 100 nm or less is particularly preferable in that the effect of the present invention is further exhibited.

The average particle size of the inorganic fine particles is 100 when the particles themselves or the cross section or surface of the void layer is observed by an electron microscope.
The particle size of each arbitrary particle is calculated, and the simple average value (number average) is calculated. Here, each grain size is represented by a diameter assuming a circle equal to the projected area.

The hydrophilic polymer used in the void layer may be the same as the hydrophilic polymer used in the swelling ink absorbing layer, but the preferred hydrophilic polymer is polyvinyl alcohol. The polyvinyl alcohol preferably used includes, in addition to ordinary polyvinyl alcohol obtained by hydrolyzing polyvinyl acetate, modified polyvinyl alcohol such as cation-modified polyvinyl alcohol having terminals and anion-modified polyvinyl alcohol having an anionic group. Be done.

The polyvinyl alcohol obtained by hydrolyzing vinyl acetate preferably has an average degree of polymerization of 300 or more, and particularly preferably has an average degree of polymerization of 1,000 to 5,000. Saponification degree is 70-100%
Those having 80 to 99.5% are particularly preferable.

The ratio of the inorganic fine particles used in the ink absorbing layer to the hydrophilic binder is usually 2: 1 to 1 in terms of mass ratio.
0: 1 is preferable, and 3: 1 to 8: 1 is particularly preferable. By setting the ratio of the inorganic fine particles to the hydrophilic binder to a large value as described above, the ink absorbing layer can achieve a high porosity. The preferable porosity is 40 to 80%, and particularly preferably 50 to 70%. The porosity is a value obtained according to the following formula.

Porosity = 100 × [(total dry film thickness-solid coating film thickness) / total dry film thickness] When the above-mentioned void layer contains polyvinyl alcohol as a hydrophilic polymer, the film forming property of the film is obtained. It is preferable to add a hardening agent in order to improve the strength and strength of the film, and examples thereof include an epoxy compound, boric acid or a salt thereof, and among them, boric acid or a salt thereof is preferable. The boric acid or a salt thereof means an oxygen acid having a boron atom as a central atom and a salt thereof, and specifically includes orthoboric acid, metaboric acid, hypoboric acid, tetraboric acid, pentaboric acid and salts thereof.

The amount of boric acid or its salt to be used can vary widely depending on the amount of the inorganic fine particles and hydrophilic polymer in the coating liquid, but is usually 1 to 60% by mass, preferably 5 to 40% by mass relative to the hydrophilic polymer. %.

In the present invention, the ink absorption rate is high and the unevenness of the image is small, and the curl is relatively small because the amount of the hydrophilic polymer used is relatively small. It is preferably a thick film.

[0076] The amount with the ink absorbing layer, when serving as a support is preferably from 40 to 100 g / m ² is preferably other cases 5 to 30 g / m ^2, particularly preferably 8 to It is 25 g / m ² . (Layer having pores) The intermediate transfer medium of the present invention has the ink absorption layer on the support and the average particle diameter of the dispersed particles (colored particles) that is smaller than the average particle diameter of the dispersed particles (colored particles). It is characterized by having a layer having pores that allow only the following substances to pass through.

When an ink having dispersed particles larger than the diameter of the pores of the layer having the pores is used for this intermediate transfer medium, only the dispersed particles of the ink are left on the layer having the pores, and the ink solvent is used. It can penetrate the lower layer. Therefore, the coloring material of dispersed particles does not enter the layer below the layer having pores, and the coloring material of dispersed particles can remain on the surface of the intermediate transfer medium.

The preferable pore diameter of the layer having the above pores is
Although it may be appropriately set depending on the dispersed particle diameter of the ink, it is preferably set to 1/10 to 9/10 of the dispersed particle diameter of the ink, and more preferably set to 1/5 to 4/5. . If the pore size is smaller than 1/10, the ink absorbency tends to deteriorate, and if it is larger than 9/10, the retransfer property tends to deteriorate, which is not preferable.

The layer having pores is preferably a layer which is substantially insoluble in the ink solvent and has permeability to the ink solvent, and an ink containing dispersed particles in the intermediate transfer medium having the above structure. At the time of recording, it is possible to allow only the ink solvent to penetrate into the lower layer and keep the dispersed particles above the layer having pores.

As the layer having pores, a metal vapor deposition layer can be preferably employed, and in particular, a thin film metal vapor deposition layer can have the above-mentioned preferable pore diameter and is very preferable from the viewpoint of being insoluble in a solvent. The pore diameter of the layer having pores as described above can be controlled by the film thickness of the metal vapor deposition layer. As another method, optimal control can be performed by controlling the degree of vacuum, selecting the purity, and the vapor deposition compound / metal species.

As such a metal vapor deposition layer, metals, metal alloys, metal compounds, metal oxides and the like are preferable, and such substances may be provided by a conventionally known vapor deposition method, and these particles may be obtained by an electrolytic dispersion method. It is also highly preferred to use self-dispersed coated / dried membranes. For example, as the metal of the metal vapor deposition layer, metals such as gold, silver, copper, aluminum, chromium, nickel, titanium and tin, metal alloys, metal compounds,
Examples thereof include metal oxides. In particular, aluminum, nickel, and chromium are preferable because they are easy to deposit and are economical. As a metal vapor deposition method, a PVD method such as a vacuum vapor deposition method, a sputtering method or an ion plating method is preferably used.

[0082] The intermediate transfer medium of the present invention preferably has a liquid transfer amount after 1 second of ethylene glycol 25% aqueous solution defined by Bristow method is ^{5ml / m 2 ~200ml / m 2} , more preferably, The liquid transfer amount after 0.5 seconds is 5 ml / m ^{2 to} 200 ml / m ² , and particularly preferably the liquid transfer amount after 0.3 seconds is 5 ml / m ^{2 to} 200 m.
1 / m ² . If it is less than 5 ml / m ² , the absorption may be poor and the image quality may deteriorate due to bleeding. Further, if it exceeds 200 ml / m ² , the film may become brittle. In addition to the above liquids, it is preferable that they have a high absorbability with respect to a wide range of aqueous solvents.

The surface roughness Ra value of the intermediate transfer medium is preferably 0.01 to 1 μm, more preferably 0.05 to 0.8 μm, and particularly preferably 0.
It is 10 to 0.6 μm. If the Ra value exceeds 1 μm, the transferability of the coloring material tends to deteriorate. When the Ra value is as close as possible to 0, the shape of the formed dots becomes unstable,
0.05 or more is more preferable. The surface roughness Ra value in the present invention is a surface roughness meter (RST / PLUS WYK).
The value is measured by the company O) and the objective lens is x1.
0x, intermediate lens is x1.0x, 624x464μm
It is calculated as an average value obtained by measuring the field of view 5 times. Since each layer is light-transmissive, the sample surface is measured after being coated with an Al coating having a thickness of 50 nm by vapor deposition. (Transfer Medium) In the present invention, since the intermediate transfer medium of the present invention has removed the ink solvent before recording (retransfer) to the transfer medium, it has been conventionally used for inkjet recording. In addition to the transfer medium, of course, the ink absorption amount that could not be conventionally obtained by ink-jet recording using a water-based dye ink or a water-based pigment ink, that is, a liquid transfer amount after 1 second by the Bristow method of 5 ml / m ² or less is used. Ink jet recording is possible even on a transfer medium. Also, the liquid transfer amount after 1 second by the Bristow method is 5 to 10 ml / m.
It is possible to provide stable and good inkjet recording without causing problems such as overflow and bleeding even with respect to a transfer medium having a conventional ink absorption of about ² which is not sufficient.

The liquid transfer amount after 1 second by the Bristow method was 5
Specific examples of the transfer medium of ml / m ² or less include, for example, conventionally known metal plates such as Al, Cu and SUS, metals such as metal foil, PET, PES, PE, PP, PS and TA.
Film base materials / cards such as C and polycarbonate,
Rubber base materials such as urethane, SBS, SIS, SEBS,
Art paper, coated paper, matte coated paper, lightweight coated paper,
Printing paper such as lightly coated paper, newspaper base paper, etc., and composite substrates combining these substrates, all substrates having a liquid transfer amount after 1 second in the Bristow method of 5 ml / m ² or less Materials and the like can be mentioned. Among these, printing paper, film, metal foil, or a combination of these substrates can be mentioned as a preferable one.

In the present invention, the printing paper may be a conventionally known printing medium. For example, various papers /
Synthetic paper and the like can be used without particular limitation and can be used.

[0086] on paper, coated paper, there is a non-coated paper, as the coated paper, the coating amount per 1m ² is one side 20g / m ² before and after of art paper, coating amount per 1m ² is one side 10g / m ² before and after the coated paper, the coating amount per 1m ² is one-sided 5g / m ² before and after the light-weight coated paper, Binurikoshi, mat coated paper matte finish, Darukoto paper of dull finish, newspaper Examples include paper.

As the non-coated paper, printing paper A containing 100% of chemical pulp, printing paper B containing 70% or more of chemical pulp, printing paper C containing 40% to 70% of chemical pulp, or less than 40% of chemical pulp. Examples thereof include printing paper D used and gravure paper containing mechanical pulp and subjected to calender treatment.

Further details are described in "Latest Paper Processing Handbook", Paper Processing Handbook Editing Committee, edited by Tech Times, "Printing Engineering Handbook", Japan Printing Society, etc. (Image formation) Next, image formation by inkjet recording will be described.

In the present invention, the above ink composition and intermediate transfer medium are used to form a primary image on the intermediate transfer medium,
Then, an image is obtained by retransferring to a desired recording medium to form a secondary image. A maximum C ^* value of the hue angle 225 ° of the maximum C ^* value and retransfer the secondary image of the hue angle 225 ° of the primary image produced in this way is that the direction of the secondary image becomes large more It is a feature.

The maximum C ^* value for a hue angle of 225 ° can be found by
The standard chart [IT8.
7/3] standard chart is output, and after the output is completed, color gamut mapping is performed in a three-dimensional color space from the L ^* a ^* b ^* data of 928 points measured 10 minutes later, and the three-dimensional color gamut is obtained. From L ^*, the maximum C ^* value formed in the cross section cut along the plane with a hue angle of 225 ° is obtained.

The colorimetry is carried out by a colorimeter [Gretag Macbeth;
specolino, key wizard] was used under the following conditions.

Light source: D50 visual field; 2 ° visual field density; ANSI T white reference; abs filter; No-filter The above measurement was performed on the primary image and the secondary image, and the difference was evaluated.

In the present invention, it is preferable that the maximum C ^* value at the hue angle of 225 ° in the secondary image is 2 or more (recovers) larger than that in the primary image, and 3 or more is preferable. Is more preferable, and one having a larger value of 5 or more is particularly preferable. In the present invention, it is preferable to heat at the time of retransfer, and it is more preferable to perform heat and pressure treatment.

The ink-on recording printed matter according to the invention of claim 15 of the present invention is the Tokubishi Art manufactured by the ink jet recording method according to any one of claims 4 to 14 (manufactured by Mitsubishi Paper Mills: 127.9 g). / M ² ], the maximum C ^* value at a hue angle of 225 ° is 50 or more and 100 or more.
And less than 60% gloss of the image portion defined by JIS-K7105 is 37 ± 10%.

If the maximum C ^* value at a hue angle of 225 ° is less than 50, the saturation may be low and the quality may be poor as a printed matter of art paper. Also, the upper limit is less than 100 from the reproduction area of the L ^* a ^* b ^* space of the printing color.

If the 60 ° gloss of the image area is less than 27%, the gloss may be inferior to that of the art paper and may be different.
Further, if it exceeds 47%, the gloss may be superior to the quality of art paper and may be different.

As an example of an inkjet recording apparatus capable of automatically performing the process of the inkjet recording method of the present invention, a sectional view showing an example of the inkjet recording apparatus used in the inkjet recording method of the invention of claim 4 of the present invention is shown. Shown in 1.

This apparatus has an ink jet recording head 1 and a drum 2 which also serves as a platen. The drum 2 has a heating means 3 inside and can effectively transfer heat to the surface.

On the surface of the drum 2, the intermediate transfer medium 4 is unwound from an unillustrated intermediate transfer medium holding means and is wound around the drum 2 via the transport roller 5.

The drum 2 has a rotating means (not shown), and conveys the intermediate transfer medium at high speed until it is detected by an intermediate transfer medium sensing sensor (not shown) provided in the ink jet recording head. After that, during inkjet recording, the inkjet recording head 1 is intermittently conveyed in the direction shown in the drawing to perform sub-scanning of the inkjet recording. Main scanning is performed by the inkjet recording head 1 shown in the plan view of the inkjet recording head and the drum in FIG. 2 at high speed. Recording is performed while moving in parallel with the second drum head. Inkjet recording head 1
Has a plurality of heads, as shown in FIG. In FIG. 2, a KCMY four-color head is taken as an example. In the present invention, a piezo method capable of high-speed driving is adopted, and main scanning is performed at 30,000 Hz at 720 dpi (dot number /
2.45 cm) output and 90-dpi 128-nozzle eight-stage recording realizes 720 × 720 dpi.

Further, the head can change the amount of droplets ejected per dot by the applied voltage, applied pulse, etc., and the flight speed of the ejected droplets is changed by the nozzle diameter, applied pulse, applied voltage, etc. It is possible to

Inkjet image recording is performed using the head as described above. Since image recording is performed on a heated intermediate transfer medium, it is dried before the conventional problems of resolution reduction, color mixing, and bleeding occur. However, rapid volatilization of the solvent causes aggregation of the coloring material, forming an image with low density / saturation.

The image thus obtained on the intermediate transfer medium and the transferred medium 6 are nipped by the pressure between the pressure roller 7 and the drum 2 to be integrated. The pressure roller is preferably pressure-bonded to the drum by a conventionally known method, and is preferably heated at a pressure of 0.2 to 10 kg / cm, like the drum. The rubber hardness of the pressure roller is preferably 50-80, and the rubber thickness is 1-15.
mm is preferred.

By separating the integrated transfer medium and intermediate transfer medium in this manner, only the ink jet image can be transferred onto the transfer medium, and this transfer step reduces the density / saturation of the image. It is possible to improve and obtain a good printed matter.

The intermediate transfer medium to which the image has been transferred is peeled from the surface of the drum 2 by the peeling member 8 and is collected by the winding roller (not shown) via the transport roller 9.

Although not illustrated in the drawing, the above-mentioned intermediate transfer medium can be repeatedly used.

Further, in the ink jet recording method according to the sixth aspect of the present invention, the heating means for the drum 2 is not always necessary, and the apparatus can be simplified.

[0108]

EXAMPLES The present invention will be specifically described below with reference to examples, but the embodiments of the present invention are not limited thereto.

Example 1 [Inkjet Ink] An ink composition having the following constitution was prepared. [Preparation of Pigment Ink-1] The following compositions were prepared for each of the Y ink, M ink, C ink, and K ink.

[0110]   Color material (listed in Table 1) 10% by mass   Formalin condensate of creosote oil sodium sulfonate     (Kamo Demol C) 2.5% by mass   2- (2-Ethylhexyl) sodium sulfosuccinate 0.01% by mass   Glycerin 10% by mass   Ethylene glycol 13 mass%   Residual adjustment so that the total mass of water collected from airborne bacteria is 100g

[0111]

[Table 1]

[Preparation of Pigment Ink-2] As a polymer, polyvinyl butyral (BL-made by Sekisui Chemical Co., Ltd.) was used.
S, average degree of polymerization 350) 15 g, John Cryl 67 (manufactured by Johnson Polymer Co., Ltd.) 5 g, coloring material (pigment ink-
The same as the case of 1) and 10 g of each and 150 g of ethyl acetate were put into a separable flask, and after the inside of the flask was replaced with N ₂ ,
The above polymer and dye were completely dissolved by stirring. Subsequently, 150 g of an aqueous solution containing sodium hydroxide and 3 g of sodium lauryl sulfate in an amount necessary to neutralize Johncryl 67 was further added dropwise and stirred, and then an ultrasonic disperser (UH-150 type, manufactured by SMT Corporation). ) Was used to emulsify at 70 ° C. for 300 seconds. After that, ethyl acetate is removed under reduced pressure, and a polymer emulsion impregnated with a dye (each Y ink of Pigment ink-2, M ink, C ink,
K ink) was obtained (shell polymer: John Kryl, 2
5%).

The polymer BL-S has Tg = 54 degrees, T
The MA softening point was 80 ° C. [Preparation of Pigment Ink-3] Polymer polyvinyl butyral (BL-S manufactured by Sekisui Chemical Co., Ltd., average degree of polymerization: 350) 15 g Colorant (same as in the case of Pigment Ink-1) 10 g each Ethyl acetate 150 g was placed in a separable flask and placed in a flask. After replacing the inside with nitrogen gas, the mixture was stirred to completely dissolve the polymer and dye. Subsequently, 150 g of an aqueous solution containing 3 g of sodium laurate was further added dropwise and stirred, and then emulsified at 70 ° C. for 300 seconds using an ultrasonic disperser (UH-150 type, manufactured by SMT Co., Ltd.). Then, ethyl acetate was removed under reduced pressure to obtain a dye-impregnated polymer emulsion.

Then, after adding 0.1 g of sodium persulfate, 2.5 g of styrene was added at 80 ° C. under a nitrogen stream to 2.
A mixture of 5 g of 2-hydroxyethyl methacrylate was added dropwise over 2 hours and polymerized to obtain core-shell type pigment ink-3 (each Y ink, M ink, C ink, K ink) (shell polymer: styrene). -2-hydroxyethyl methacrylate copolymer, 25%).

The core polymer BL-S had Tg = 54.
The TMA softening point was 80 ° C. The shell polymer had a Tg of 85 degrees and a TMA softening point of 128 ° C. [Preparation of Intermediate Transfer Medium-1] Preparation of Support-1 Support Void PET film [Toray Industries Co., Ltd .: QE02 specific gravity: 0.7] was coated with the following ink-absorbing layer coating liquid-1 at a dry coating weight of 20 g / m < ² >. Then, coating / drying was performed so that an ink absorbing layer was provided to obtain a support-1. Ink absorption layer coating liquid
1 was adjusted with ion-exchanged water so that the solid content was 20%. [Ink Absorbing Layer Coating Liquid-1] Synthetic amorphous silica (Aerosil A300, manufactured by Nippon Aerosil Co., Ltd.) 70 parts PVA (PVA-117, manufactured by Kuraray Co., Ltd.) 15 parts Polydiallyldimethylammonium chloride cation resin (PAS-H-5L) , Nitto Boseki Co., Ltd.) 15 parts Preparation of "pore layer (nickel metal vapor deposition layer) on temporary support, adhesive layer-1" Meanwhile, OPP film [Alphan S: SS of temporary support
-121 # 20 manufactured by Oji Paper Co., Ltd.], a nickel metal vapor deposition layer was formed to a thickness of 20 nm to form a pore layer-1. After that, an adhesive paderacol IJ-70 [urethane latex: manufactured by Dainippon Ink and Chemicals, Inc.] was further applied and dried on the temporary support / pore layer-1 to form a dry film thickness of 1 μm to form an adhesive layer, A "pore layer (nickel metal vapor deposition layer) on the temporary support, adhesive layer-1" was obtained.

The ink absorbing layer surface of the above-mentioned support-1 and "a pore layer (a nickel metal vapor deposition layer) on the temporary support, an adhesive layer-
1 "adhesive layer-1 surface is bonded so as to face each other, and thermal transfer is performed under the standard conditions of EV-Laminator II manufactured by Konica Corporation, after which the temporary support (OPP film) is peeled off, and the support / ink absorption layer is formed. An intermediate transfer medium-1 having a constitution of -1 / adhesive layer-1 / pore layer-1 was obtained.

The liquid transfer amount of the obtained intermediate transfer medium-1 after 1 second of an aqueous 25% ethylene glycol solution defined by the Bristow method was 30 g / m ² . [Image formation] An image was output using an inkjet printer (Machjet MJ-810C; manufactured by Seiko Epson Corp.) using the above pigment ink-1, pigment ink-2, pigment ink-3 and intermediate transfer medium-1. After that, the printing surface of the intermediate transfer medium-1 and Tokubishi Art [127.9 g / m < ² > manufactured by Mitsubishi Paper Mills] as the recording medium-1 are joined and EV-Laminator II manufactured by Konica Corporation is used. , Transfer temperature: lower roll 120 ℃, upper roll 100 ℃,
Recording speed: 5 mm / sec, and then the intermediate transfer medium-1 is peeled off by hand to obtain a recording medium-1 (Tokuryo Art [Mitsubishi Paper Mills 127.9 g / m ² ]). An image was formed on. Evaluation item Image output condition setting Image output is adjusted so that each color of ink on inkjet paper [QP-PRO Photosilky: manufactured by Konica Corporation] has the following target densities. Do it as a basis.

Y; 1.04 M; 1.53 C; 1.48 K; 1.83 Colorimeter is a colorimeter [manufactured by Gretag Macbeth; spectr
[Olino, key wizard] was performed under the following conditions.

Light source; D50 visual field; 2 ° visual field density; ANSI T white standard; abs filter; No-filter [Surface roughness: Ra value] Surface roughness: Ra value indicates that each layer is light transmissive, A with a thickness of 50 nm by vapor deposition
After applying l coating, surface roughness meter (RST / P
LUS WYKO) and objective lens is x10
The field of view of 624.times.464 .mu.m was measured as an average value of 5 times when the magnification was 1.0.times. [Liquid transfer amount (Bristow method)] The liquid absorption test was carried out according to the liquid absorption test (for details, see J. TAPPI paper pulp test method No. 51). That is, 15 μl of an ethylene glycol 25% aqueous solution was added to the head box, and the amount of transfer at a contact time of 1 second was measured using a Bristow tester (Liquid dynamic absorption tester manufactured by Kumagai Riki Kogyo Co., Ltd.). . [Transferability] A solid image having a target density for each color was prepared, transferred to a recording medium, and the peeled image was visually evaluated.

O ... All the image on the intermediate transfer medium is transferred onto the recording medium. Δ ... Image is formed on the recording medium, but color material remains on the intermediate transfer medium. ×: The image on the intermediate transfer medium does not move well on the recording medium. [Fixability] A solid of the target density for each color is made, and the [coverup tape 652: manufactured by Sumitomo 3M Co., Ltd.] was attached, and the peeled state was visually evaluated for transfer based on the following criteria.

○: No peeling Δ: Partial transfer part is peeled off ×: All transfer part is peeled off [Density] A solid of the target density of each color is prepared, and the density of the secondary image is measured by the above-mentioned color measurement. It was measured under the conditions of a machine and color measurement. [Saturation] The maximum value of the C ^* value at a hue angle of 225 ° is calculated by the standard chart [IT
8.7 / 3] standard chart is output, and after the output is completed, 1
3 from 928 L ^* a ^* b ^* data measured from 0 minutes later
Performs gamut mapping in the three-dimensional color space and sets the three-dimensional gamut to L
The maximum C ^* value at the hue angle of 225 ° (that is, the maximum value of the C ^* value) formed in the cross section cut along the plane of the hue angle of 225 ° from ^* was determined as the saturation.

Color measurement is carried out by a color measuring device [manufactured by Gretag Macbeth;
specolino, key wizard] was used under the following conditions.

Light source; D50 visual field; 2 ° visual field density; ANSI T white standard; abs filter; No-filter The above measurement was performed on the primary image and secondary image, and the hue angle was 2
The maximum C ^* value (saturation) at 25 ° was determined. Also, the difference was obtained. [Glossiness] Tokubishi Art [Mitsubishi Paper Mills: 127.9 g /
m ² ], and the difference in gloss between the paper and the image area was confirmed.
The gloss was measured at 60 ° gloss. The measuring method is JIS-K
7105.

[0124] ◎ ... Less than 5 difference in gloss between image area and paper ○: The difference in gloss between the image area and the paper is 5 or more and less than 10 ×: The difference in gloss between the image area and the paper is 10 or more The results are shown in Table 2.

[0125]

[Table 2]

From Table 2, it can be seen that in the case of the present invention, an ink-on recording printed matter having good transferability and fixability, high density and high saturation can be obtained.

Example 2 The same procedure as in Example 1 was carried out except that the following intermediate transfer medium-2 was used as the intermediate transfer medium-1, and the same evaluation was performed. Intermediate transfer medium -2] [Support -2 support void PET film [made by Toray: QE02 specific gravity: 0.7] comprising an ink absorbing layer coating solution-2 following a dry coating weight 20 g / m ² to Thus coated / dried to provide an ink absorbing layer. Ink absorption layer coating liquid
The coating liquid of 2 was adjusted with ion-exchanged water so that the solid content was 20%.

After that, on top of that, Paderacol IJ-70
[Urethane latex: manufactured by Dainippon Ink and Chemicals, Inc.] was applied so as to have a dry coating amount of 1 g / m ^2, and dried to form a resin layer. [Ink Absorbing Layer Coating Liquid-2] Synthetic amorphous silica (Aerosil A300 manufactured by Nippon Aerosil Co., Ltd.) 70 parts PVA (PVA-117, manufactured by Kuraray Co., Ltd.) 15 parts Polydiallyldimethylammonium chloride cation resin (PAS-H-5L) , Nitto Boseki Co., Ltd.) After 15 parts, a coating solution for pore layer-2 (tin sol dispersion liquid (Ceramaces S-8, manufactured by Taki Chemical Co., Ltd.)) was dried to a weight of 0.1 g
/ M ² and made like coating, the pore layer-2 provided by drying,
The intermediate transfer medium-2 of the present invention was obtained.

The liquid transfer amount of the obtained intermediate transfer medium-2 after 25 seconds of 25% ethylene glycol aqueous solution specified by the Bristow method was 25 g / m ² .

Intermediate transfer medium-2 prepared as described above
Even in the case of using, the improvement of the density and the saturation was confirmed in the case of the present invention as in the case of the present invention of Example 1, and a clear image was obtained.

[0131]

INDUSTRIAL APPLICABILITY According to the present invention, an ink jet ink composition having a high density and a high saturation, capable of satisfactorily transferring only an ink jet image to a wide range of substrates without problems such as cockling, and having a sufficient strength of the ink jet image after transfer. And an inkjet recording method and an ink-on recording printed matter.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of an inkjet recording device used in the present invention.

FIG. 2 is a schematic plan view showing an inkjet recording head and a drum of the inkjet recording apparatus shown in FIG.

[Explanation of symbols]

A inkjet recording device 1 Inkjet recording head 2 drums 3 heating means 4 Intermediate transfer medium 5 transport rollers 6 Transfer medium 7 Pressure roller 8 Peeling member 9 Conveyor roller

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B41J 3/04 101Z F term (reference) 2C056 FC02 FD13 HA46 2H086 BA13 BA15 BA26 BA41 BA55 BA59 BA60 4J039 AD01 AD03 AD04 AD07 AD08 AD09 AD11 AD12 AE04 AE06 AE07 AE08 AE10 BC10 BD02 BD03 BE02 BE12 BE17 BE22 CA06 EA03 EA21 EA43 EA46 GA24

Claims (15)

[Claims] 1. An inkjet ink composition containing at least water and dispersed particles, the primary image formed on a layer having pores smaller than the diameter of the dispersed particles, and the primary image on a recording medium. An inkjet ink composition, wherein the maximum C ^* value of the retransferred secondary image at a hue angle of 225 ° is larger by 2 or more in the secondary image than in the primary image. 2. The inkjet ink composition according to claim 1, wherein a heat treatment is performed at least when the retransfer is performed. 3. The inkjet ink composition according to claim 1, wherein the dispersed particles are colored particles having thermoplasticity. 4. A step of inkjet recording on an intermediate transfer medium using an inkjet ink composition containing at least water and colored particles having thermoplasticity, and removing volatile components of the ink sprayed on the intermediate transfer medium. An inkjet recording method comprising forming an image by a step and a step of retransferring a component remaining on an intermediate transfer medium to a medium to be transferred. 5. The ink jet recording method according to claim 4, wherein the step of removing the volatile component is performed simultaneously with the step of performing the ink jet recording. 6. A step of inkjet recording on an intermediate transfer medium having pores having an average particle diameter of the colored particles or less using an inkjet ink containing at least water and colored particles having thermoplasticity, and the intermediate transfer medium. An ink jet recording method, wherein an image is formed by a step of retransferring the components remaining on the transfer medium to a transfer medium. 7. The inkjet according to claim 6, wherein a liquid transfer amount of the 25% aqueous solution of ethylene glycol defined by the Bristow method of the intermediate transfer medium after 1 second is 5 to 200 ml / m ^2. Recording method. 8. The surface roughness Ra value of the intermediate transfer medium is
The ink jet recording method according to claim 6 or 7, wherein the thickness is 0.01 to 1 µm. 9. The ink jet recording method according to claim 6, wherein the outermost surface layer of the intermediate transfer medium is a metal vapor deposition layer. 10. The ink jet recording method according to claim 4, wherein the colored particles having thermoplasticity are microcapsules having a core-shell structure. 11. The ink jet recording method according to claim 10, wherein at least a dye and a thermoplastic resin are contained in a core portion of the core-shell structured microcapsule. 12. The ink jet recording method according to claim 10, wherein at least a pigment and a thermoplastic resin are contained in a core portion of the core-shell structured microcapsule. 13. The ink jet recording method according to claim 10, wherein at least a dye-pendant thermoplastic resin is contained in a core portion of the microcapsule having the core-shell structure. 14. The thermal deformation starting temperature of the microcapsules is 50 to 150 ° C. 10.
14. The inkjet recording method according to any one of claims 1 to 13. 15. A hue angle of an ink-on recording printed matter on Tokubishi Art [Mitsubishi Paper Mills: 127.9 g / m ² ] produced by the ink jet recording method according to any one of claims 4 to 14. Maximum C ^* value at 225 ° is 50 or more 10
An ink-on-recorded printed matter, which is less than 0 and has a 60 ° gloss of 37 ± 10% in the image portion defined by JIS-K7105.