JPS62283173A - Recording method - Google Patents

Abstract

PURPOSE:To carry out recording by an ink jet method with high surface gloss and image density as well as improved resolving power, water resistance and preservation quality of the recorded images, by carrying out recording using a recording solution having a specific viscosity on a material, having an ink transporting layer and ink holding layer and used for recording. CONSTITUTION:For example, (A) an ink holding layer, preferably a nonporous layer, consisting of polyvinylpyrrolidone, etc., and having 3-20mum thickness and (B) an ink transporting layer, preferably a porous layer, consisting of nondyeing particles, e.g. polyethylene resin, etc., and binding material, e.g. PVA, etc., and having light diffusion property and 3-50Xm thickness, are successively formed on a substrate, e.g. polyethylene terephthalate film, etc., by a bar coater method, etc., and a recording solution having <=50cP, preferably <=12cP viscosity at 25 deg.C (preferably obtained by dissolving a water-soluble dye in a mixed solvent of water and a polyhydric alcohol, e.g. diethylene glycol, etc.) is used for recording on the resultant material to be recorded to carry out the aimed recording.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a recording method, and more specifically, the present invention relates to a recording method that has high surface gloss and image density, and has excellent resolution, water resistance, and storage stability. The present invention relates to a recording method that provides a recorded image, particularly an inkjet recording method.

[Conventional technology]

The inkjet recording method uses various ink ejection methods, such as an electrostatic suction method, a method that applies mechanical vibration or displacement to the ink using a piezoelectric element, a method that heats the ink to foam it, and uses the resulting pressure. Recording is performed by generating and flying small droplets of ink, and making some or all of them adhere to a recording material such as paper, which generates little noise and allows high-speed printing and multi-color printing. This method is attracting attention.

For inkjet recording, patented inks that mainly contain water are used for safety and recording characteristics, and polyhydric alcohols are added to prevent nozzle clogging and improve ejection stability. There are many cases.

The recording material used in this inkjet recording method has conventionally been a recording material consisting of a base material called ordinary paper or inkjet recording paper on which a porous ink receiving layer is provided. However, as the performance of inkjet recording apparatuses increases and becomes more widespread, such as faster recording speeds and multicolor recording, more advanced and wide-ranging properties are being required of recording materials. In other words, the recording material for inkjet recording to obtain high-resolution, high-quality recorded images must (1) be able to receive ink as quickly as possible on the recording material, and (2) have overlapping ink dots. (3) Ink droplets do not spread on the recording material and the diameter of the ink dot does not become larger than necessary, (4) ) The shape of the ink dot should be close to a perfect circle and its circumference should be smooth; (5) The OD (optical density) of the ink dot should be high and the periphery of the dot should not be blurred. There is.

Furthermore, in order to obtain high-resolution recorded image quality comparable to color photography using a multicolor inkjet recording method, in addition to the above-mentioned required performance, (6) the coloring components of the ink must have excellent color development; 7) The ink fixation properties are particularly excellent, as the same number of droplets as the number of ink colors may adhere to the same spot, (8) The surface must be glossy, (9) Whiteness A high level of performance, etc., is required.

[Problems to be Solved by the Invention] In order to meet the above requirements, recording materials (for example, coated paper) having a porous ink absorbing layer provided on a base material have conventionally been used. However, since the ink absorbing layer of this recording material is porous, there is a problem that the ink receiving layer, that is, the recording surface has no gloss and the OD (optical density) of the formed ink dots is low.

As methods for imparting surface gloss, methods such as applying a transparent overcoat to the recording surface after recording or laminating a transparent film are known, but these methods require post-processing steps, etc. The process is complicated and difficult to implement in general homes or offices, even if it is not suitable for mass production. Even if such a complicated process is adopted, if the image density of the recorded image itself is low, it is still impossible to obtain a recorded image with a high image density.

In addition, glossy paper with surface gloss has a glossy appearance, but has poor ink absorbency, and cannot cope with an increase in the amount of ink associated with high-speed recording and high image density.

Accordingly, an object of the present invention is to provide a recording method that provides a recorded image that has particularly high surface gloss and is excellent in ink absorption, image density, resolution, and sharpness.

[Means for solving problems]

The above objects of the present invention are achieved by the following present invention.

That is, the present invention is a method of recording using a recording liquid on a recording material having an ink transport layer and an ink holding layer, characterized in that the viscosity of the recording liquid at 25° C. is 50 cp or less. This is a recording method that

[Effect]

To explain the present invention in detail, the first feature of the present invention resides in a recording material having a specific configuration, and the second feature resides in the use of a recording liquid that appropriately matches the recording material. The object of the invention has been achieved by the combination of the first and second features.

The recording material that first characterizes the present invention will be described in detail. 1. The recording material used in the present invention is primarily characterized by having an ink transport layer and an ink retention layer.

That is, the ink transport layer has liquid permeability and has the function of quickly absorbing and transmitting the recording liquid attached to its surface, while the ink retaining layer has the ability to absorb or transmit the recording liquid that has migrated from the ink transport layer. It has the function of absorbing and retaining recording material.

At this time, the ink transport layer must have high affinity for the liquid medium in the recording liquid, and at the same time, the recording agent (dye,
For colorants such as pigments and materials with color-forming properties,
On the contrary, affinity must be low.

Therefore, the ink transport layer wets and wets the recording liquid medium.
It must be constructed by selecting a material that has properties such as penetration and diffusion, but does not have properties such as adsorption, penetration, and reaction with respect to the recording material.

On the other hand, the ink retaining layer is temporarily absent from the ink transport layer. Therefore, the ink retaining layer is similar to the recording liquid medium.
It must also have high affinity for recording agents.

The recording material used in the present invention includes a base material as a support, an ink retention layer formed on the support that substantially absorbs and captures the recording liquid or recording agent, and an ink retention layer formed on the ink retention layer. In addition, it is composed of an ink transport layer that directly receives recording liquid, has liquid permeability, and leaves substantially no recording agent.

However, if the ink transport layer or the ink retention layer also functions as a base material, the base material is not necessarily required.

As the base material used in the present invention, conventionally known materials can be used, and specifically, polyester resin, diacetate resin, triacetate resin, polystyrene resin, polyethylene resin, polycarbonate resin, polymethacrylate resin, cellophane, celluloid, polyester resin, etc. Examples include plastic films, plates, and glass plates made of vinyl chloride resin, polyimide resin, and the like.

In the present invention, when observing a recorded image from the side opposite to the recording side, the base material needs to have light-transmitting properties.

The ink transport layer constituting the recording material used in the present invention needs to have liquid permeability.

In the present invention, liquid permeability means that the recording liquid can pass through quickly,
A property that substantially prevents the recording agent in the recording liquid from remaining in the ink transport layer.

A preferred embodiment for improving liquid permeability is one in which the ink transport layer has a porous structure with cracks and communicating holes inside.

Furthermore, as described above, in the present invention, when a reflective recorded image is observed from the side opposite to the ink-applied surface, it is preferable that the ink transport layer has light diffusing properties.

The ink transport layer that satisfies the above characteristics is mainly composed of particles that do not stain the recording material and a binder.

The particles used in the present invention include organic pigments such as thermoplastic resins and thermosetting resins that are dyeable to the recording agent, such as polyethylene, polymethacrylate, elastomers, etc.
Ethylene-vinyl acetate polymer, styrene-acrylic copolymer, polyester, polyacrylic, polyvinyl ether, polyamide, guanamine, polyolefin, SBR
If desired, at least one of resin powders and emulsions such as the above, and non-porous inorganic pigment powders may be used.

Incidentally, the particles used in the present invention are not limited to the above-mentioned particles, and any known material may be used as long as it is non-stainable to the recording material.

Furthermore, the binder used has the function of binding the resin particles and/or the ink retaining layer, and, like the particles, must be non-staining to the recording material. It is.

Any conventionally known material can be used as a preferable binding material as long as it has the above-mentioned functions, such as:
Polyvinyl alcohol, acrylic resin, styrene-acrylic copolymer, ethylene-vinyl acetate copolymer, starch, polyvinyl butyral, gelatin, casein, ionomer, gum arabic, carboxymethylcellulose, polyvinylpyrrolidone, polyacrylamide, phenol, melamine, epoxy, One or more resins such as styrene-butadiene rubber, urea, α-olefin, vinyl urethane, vinyl acetate, chlorobrene, and nitrile rubber can be used as desired.

Furthermore, in order to improve the function as an ink transport layer, various additives such as surfactants, penetrants, etc. may be added to the ink transport layer as necessary.

The mixing ratio (weight ratio) of the particles and the binder is preferably in the range of particles/binder = l/3 to 50/l, more preferably in the range of 3/1 to 20/1. .

When this mixing ratio is 1/3 or less, cracks and communication pores in the ink transport layer become small, and the recording liquid absorption effect decreases. Furthermore, if the mixing ratio is 50/1 or more, adhesion between the particles or between the particles and the ink retaining layer becomes insufficient, making it impossible to form an ink transport layer.

The thickness of the ink transport layer depends on the amount of recording liquid, but is preferably 1 to 200 μm, more preferably 3 to 50 μm.
It is m.

Next, the non-porous ink holding layer that substantially captures the recording liquid or recording agent absorbs and captures the recording liquid that has passed through the ink transport layer, and substantially permanently retains the recording liquid.

Therefore, the ink retaining layer needs to have a stronger ability to absorb recording liquid than the ink transport layer.

This is because if the absorption power of the ink retention layer is weaker than the absorption power of the ink transport layer, the recording liquid applied to the surface of the ink transport layer will pass through the ink transport layer, and the leading edge of the recording liquid will pass through the ink transport layer. When the recording liquid reaches the holding layer, the recording liquid stays in the ink transport layer, and at the interface between the ink transport layer and the ink holding layer, the recording liquid permeates and diffuses laterally within the ink transport layer. become. As a result, the resolution of the recorded image decreases, making it impossible to form a high-quality image.

Furthermore, as described above, when observing a recorded image from the side opposite to the recording surface, the ink retaining layer needs to be light-transmissive.

The ink retaining layer that satisfies the above requirements is preferably made of a light-transparent resin that adsorbs the recording agent and/or a light-transparent resin that is soluble and swellable in the recording liquid.

For example, when an aqueous recording system containing an acid dye or a direct dye is used as the recording agent, the ink retaining layer may be a cationic resin that has adsorption to the dye and/or a cationic resin that is swellable to the aqueous recording liquid. It is composed of a hydrophilic polymer having the following properties.

For example, any of the resins listed below can be suitably used.

(1) Block copolymers or graft copolymers having a hydrophilic segment and a hydrophobic segment in the molecule These block copolymers or graft copolymers are generally water-insoluble but hydrophilic. Hydrophilic segments of such polymers include, for example, carboxy groups, sulfonic acid groups, hydroxyl groups, ether groups, acid amide groups, methylolated groups thereof, primary to tertiary amino groups, quaternary ammonium groups, etc. It is a segment in which two or more vinyl monomers having hydrophilic groups are polymerized. Examples of such wood-philic monomers include (meth)acrylic acid,
Mono(meth)acrylates or monomalates of polyols such as maleic anhydride, vinyl sulfonic acid, sulfonated styrene, vinyl acetate, and ethylene glycol;
(meth)acrylic acid amide and their methylolated products,
Examples include monoalkylaminoethyl (meth)acrylate, quaternized products thereof, vinylpyrrolidone, and vinylpyridine.

Hydrophobic polymer segments include olefins such as ethylene, propylene, and butylene; aromatic vinyl compounds such as styrene, methylstyrene, and vinylnaphthalene; halogenated olefins such as vinyl chloride, vinylidene chloride, and vinylidene fluoride; It is a polymer of two or more monomers such as acrylic acid, crotonic acid, and various alcohol esters of underground saturated carboxylic acids.

In addition, water-soluble polymers other than those mentioned above, such as albumin,
Gelatin, casein, starch, cationic starch, gum arabic, natural resins such as sodium alginate, polyvinyl alcohol, polyamide, polyacrylamide, polyvinylpyrrolidone, polyethyleneimine, polyvinylpyridium halide, melamine resin, polyurethane, polyester, sodium polyacrylate, etc. It goes without saying that hydrophilic natural or synthetic polymers, such as hydrophilic natural or synthetic polymers, or hydrophobic natural or synthetic polymers modified to be water-insoluble can also be used as the hydrophilic polymer segment or the hydrophobic polymer segment.

(2) Crosslinked water-soluble polymers Various water-soluble polymers as described above and below are crosslinked with a suitable crosslinking agent or radiation to the extent that they become water-insoluble without losing their hydrophilicity.

(3) Polymer complex A polymer complex is made up of two or more water-soluble to hydrophilic polymers that are different from each other and that act on each other, and it produces a mixture with properties different from any of the original polymers. For example, two or more types of polymers form some kind of strong bond due to interionic electrostatic force, hydrogen bonding, van der Waals force, partial transfer of charge, etc.

Although various kinds of polymer complexes can be used, a particularly preferred one in the present invention is a polymer complex consisting of a basic polymer and an acidic polymer.

Note that the material constituting the ink retaining layer is not particularly limited as long as it has the function of absorbing and trapping the recording liquid and can form a non-porous layer.

The thickness of the ink holding layer may be sufficient as long as it is sufficient to absorb and capture the recording liquid, and although it varies depending on the amount of recording droplets, it is preferably 1 to 50 μm, and more preferably the thickness described above. A coating solution is prepared by dissolving or dispersing the above-mentioned materials in an appropriate solvent, and the coating solution is coated by a known method such as a roll coating method, a rod bar coating method, a spray coating method, an air knife coating method, etc. A method in which the material is coated on a substrate and dried quickly is preferred, such as a hot-melt coating method or a method in which a single sheet is formed from the material and then the sheet is laminated onto the substrate. Any method is fine.

In the present invention, the object of the present invention is achieved by using a recording material having a specific configuration as described above and using a specific ink as described below.

The ink used in the method of the present invention and which secondly characterizes the present invention is basically a recording liquid consisting of a water-soluble dye as a recording agent and a liquid medium component. Generally, when recording using ink, it is important to match the liquid physical properties (viscosity, surface tension, etc.) of the recording material and the ink. For example, the absorption speed of ink decreases in almost inverse proportion to the viscosity of the ink, and the diameter of printed dots tends to decrease. The degree of change in printing characteristics varies depending on the structure and material of the recording material, and it is therefore important to match the liquid physical properties of the recording material and ink.

As the recording agent which is an essential component of the ink used in the recording method of the present invention, water-soluble dyes such as direct dyes, acid dyes, and food colorants are preferably used.

For example, direct dyes include c, r, direct black 2, 4, 9, 11, 14,
17,19°22.27,32,36,38,41.4
8,49,51.56,62,71.

74.75, 77.78, 80.105.106.10
7,108.112゜113.117,132,146
,154,194 ;C,1, Direct Yellow 1,
2,4,8,11,12,24,26°27.28,3
3, 34, 39, 41. 42, 44, 48, 50, 51
．． 58°72.85,86,87,88,98,100
, 110.

c, r, direct orange 6.8, 10, 26, 29
,39,41°49.51,102; C,! , Direct Red 1, 2, 4, 8, 9, 11,
13,17°20.23,24,28,31,33,3
7,39,44,46,47,48゜51.59,62
,63,73,75,77.80,81.83,84,
85°90.94,99,101,108,110,1
45,189,197,220°224.225,22
6.227,230.

C, 1, Direct Violet 1, 7, 9, 12,
35,48°51.90,94; C,1, Direct Blue 1.2,6,8,15,22
,25,34゜69.71,72,75,76.78,
80, 81, 82, 83, 86.90°98.106,
108, 11, 120, 123, 158, 163, 16
5,192°193.194,195,196,199
,200,201,202,203゜207.218,
236,237,239,246,258:C,1
, Direct Green 1.6, 8, 28, 33, 37,
63°64: c4. Direct Brown IA, 2, 6, 25, 27,
44,58°95.100. lot, 106,112,
173,194,195,209゜210.211
.

Acidic dyes include C, T, acid black 1, 2,
7゜16.17, 24, 26, 28, 31.41.48
,52,58,60,63゜94.107,109,1
12,118,119,121,122,131゜15
5.156; C, I acid yellow 1.3, 4, 7, 11, 1
2,13,14゜17.18,19,23,25,29
,34,36,38,40,41.42°44.49,
53, 55, 59, 61, 71.72, 76.78, 9
9.111.

114.116,122,135,161,172.

C, I Associated orange 7, 8, 10, 33, 56,
64; C, 1, acid red 1, 4, 6, 8, 13
,14,15,18,19゜21.26,27,30,
32, 34, 35, 37, 40, 42, 51, 52゜5
4.57, 80, 82, 83, 85, 87, 88, 89
,92,94,97°106.108,110,119
, 129, 131. ．． 133,134,135°154
．． 155, 172, 176. 180, 184, 186,
187,243°249.254,256,260,2
89,317,318.

C, 1, Assisted Eyelet 7, 11, 15, 34
, 41° 43.4, 9, 75; C, 1, acid blue 1.7, 9, 22, 23, 25
,27,29°40.41.43,45,49,51.
53,55,56,59,62,78゜81.83,9
0,92,102,104,111,113,117,
120°124.126,145,167.171,1
75, 183, 229, 234° 236: C, 1, acid green 3, 9, 12, 16, 19,
20,25°27.41; C,1, Acid Brown 4,14; Furthermore, food colorants include: C,1, Food Black 2; C,1, Food Yellow 3,4,5.

C, 1, Food Red 2, 3, 7, 9, 14, 52, 8
7,92,94゜102.104,105,106
;C, 1, food violet 2; C,! , Food Blue I, 2; C, 1, Food Green 2.3, etc., but are not limited to these, of course.

The liquid medium components of the ink used in the method of the present invention include not only the water wheel but also the viscosity of the ink at 25°C of 5.
0 cp, more preferably 25 cp, particularly preferably 1
Preferably, a mixture of water and various water-soluble organic solvents is used within a range not exceeding 2 cp. If the viscosity of the ink at 25° C. exceeds 50 cp, even if a specific recording material such as the one described above is used, the ink absorbency will decrease and the time required to fix the ink will become longer, limiting the recording speed. In addition, when there is overlap between inks, mixing of inks of different colors may occur, and unnecessary enlargement or disturbance of ink dots may occur, which is not appropriate.

Examples of the water-soluble organic solvent used in preparing the above ink include methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol,
n-butyl alcohol, 5ec-butyl alcohol, t
Alkyl alcohols having 1 to 4 carbon atoms such as ert-butyl alcohol and isobutyl alcohol; amides such as dimethylformamide and dimethylacetamide; ketones or ketone alcohols such as acetone and diacetone alcohol; ether necks such as tetrahydrofuran and dioxane; N-methyl-2-pyrrolidone, 1,3-dimethyl-
Nitrogen-containing heterocyclic ketones such as 2-imidaridinone; polyalkylene glycols such as polyethylene glycol and polypropylene glycol; ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, 1,2.6-hexandriol, thiodi Alkylene glycols in which the alkylene group has 2 to 6 carbon atoms, such as glycol, hexylene glycol, diethylene glycol; glycerin; ethylene glycol methyl ether, diethylene glycol methyl (or ethyl) ether, triethylene glycol monomethyl (or ethyl) ether and lower alkyl ethers of polyhydric alcohols.

Among these many water-soluble organic solvents, particularly preferred are diethylene glycol, which is a polyhydric alcohol, and triethylene glycol monomethyl (or ethyl) ether, which is a lower alkyl ether of polyhydric alcohol. With polyhydric alcohols, the water in the ink evaporates,
Based on the precipitation of the recording agent (it is highly effective as a wetting agent for preventing nozzle clogging), it is particularly preferred.

Solubilizing agents can also be added to the ink. Typical solubilizing agents are nitrogen-containing heterocyclic ketones, and their intended action is to dramatically improve the solubility of recording agents in liquid media. For example, N-methyl-2-pyrrolidone and 1,3-dimethyl-2-imidazolidinone are preferably used.

Ink prepared from such components has its own recording properties (signal response, droplet formation stability, ejection stability,
It has excellent long-term continuous recording performance, ejection stability after a long recording pause) and storage stability, and also has excellent dot density, dot shape, degree of blurring, color sharpness, and
Although it has excellent ink absorption and ink fixing properties,
In order to further improve these properties, various additives may be further included. For example, viscosity modifiers such as polyvinyl alcohol, cellulose, and water-soluble resins; various cationic, anionic, or nonionic surfactants; surface tension modifiers such as jetanolamine and triethanolamine; and pH adjustment using buffering agents. Agents, etc. can be mentioned.

Further, in order to prepare ink used in a type of recording method that charges the ink, a resistivity adjuster such as inorganic salts such as lithium chloride, ammonium chloride, and sodium chloride is used. Further, urea and thiourea are preferably used as water retention improvers at the tip of the discharge orifice. Note that in the case of a tin plate that discharges ink by the action of thermal energy, thermal physical property values (eg, specific heat, coefficient of thermal expansion, thermal conductivity, etc.) may be adjusted.

The inkjet recording method of the present invention using the above-mentioned specific ink and the above-mentioned specific recording material effectively releases the above-mentioned ink from the nozzle, and If it is a method that can be given to
Any method may be used, and a typical method is, for example, IEEE Transactions In
Industry Applications Vol.
, IA-13゜No.l (February/March 1977 issue),
Nikkei Electronics April 19, 1976 issue, 19
Some of the methods described in detail in the January 29, 1973 issue and the May 6, 1974 issue are, briefly, an electrostatic attraction method. In this method, a strong electric field is applied between the nozzle and an accelerating electrode placed several millimeters in front of the nozzle, and the ink particles are drawn out one after another from the nozzle, and the drawn out ink particles fly between the deflection electrodes. There are two methods: one is to apply an information signal to a deflection electrode for recording, and the other is to eject ink droplets in response to the information signal without deflecting the ink droplets.

The second type is an ultrasonic vibration method, in which a small pump applies high pressure to the ink and the nozzle is mechanically vibrated with a crystal oscillator or the like, thereby forcibly ejecting minute ink particles. At the same time as the ejected ink particles are ejected, they are charged in accordance with the information signal. When the charged ink particles pass between the deflection electrode plates, they are deflected according to the amount of charge.

Another method that uses this method is the microdot inkjet method, which maintains the ink pressure and excitation conditions within a certain range of appropriate values.
Two types of ink droplets, large and small, are generated from the nozzle tip, and only the small and medium-sized droplets are used for recording. A feature of this method is that it is possible to obtain a group of minute droplets even with a conventionally large nozzle diameter.

Thirdly, there is a piezo element method. This method uses a piezo element as a pressure means to apply pressure to the ink, rather than a mechanical means such as a pump like other methods. This is a method in which pressure is applied to the ink and it is ejected from a nozzle.

In addition, an inkjet method is disclosed in Japanese Patent Application Laid-Open No. 54-59936, in which ink subjected to the action of thermal energy causes a sudden change in volume, and this state change causes the acting force to eject the ink from a nozzle. can also be used effectively.

(Example) Hereinafter, the present invention will be specifically explained based on Examples.

A polyethylene terephthalate film (thickness: 100 μm, manufactured by Toshi ■) was used as a translucent base material. Composition A below was coated onto this base material using a bar coater method to a dry film thickness of 5 μm, and the film was heated at 120°C. , 5 minutes in a drying oven.

Composition A was further coated with Composition B shown below to a dry film thickness of 20 μm using a barcoder method, and dried in a drying oven at 80° C. for 10 minutes.

Composition B The recording material thus obtained was white and opaque. The following seven types of ink are used on this recording material using a recording device that has an on-demand inkjet recording head that generates bubbles with a heating resistor and uses the resulting pressure to eject recording liquid. Inkjet recording was performed.

The compositions of the seven types of recording liquids used are shown below. The recorded matter thus obtained was tested and evaluated in accordance with the following method to determine whether it was sufficiently suitable for the purpose of the present invention. The results are shown in Table 2.

(1) Ink absorption was measured by leaving the recorded matter at room temperature after inkjet recording, and measuring the time until the ink sufficiently dried and fixed without adhering to the finger even if the recorded area was touched with the finger.

(2) Image optical density (0, D) is Macbeth densitometer TR.

524, the black ink recording area was measured from the substrate side (A) and the ink application side (B).

(3) Color clarity was determined by visually comparing the color clarity of the inkjet recorded images, and ranking the best one as ◎, the worst as ×, and ranked ◎, ○, △, and X.

Ink included: Viscosity 5.1 cps (25°C) Ink B; Viscosity 11. ocps (25℃) Ink D; Viscosity 36.2
cps (25℃) Ink F; Viscosity 54.6cps (
(25℃) Ink G: Viscosity 74.0cps (25℃) Ink H: Viscosity 90.0cps (25℃) Ink
ABCDEFGH ink absorption 1 second 3
seconds 16 seconds 30 seconds 1 minute 5 minutes 15 minutes 30 minutes Image optical density A
1.971.801.72 1.651.501.2
30.88 0.60B O,560,590,60
0,630,690,771,011,12 Color vividness ◎ ◎ ○ O○ △ × × (Effect) According to the present invention as described above, the ink transport layer of the recording material used in the present invention is a porous layer. It has ink absorption and liquid permeability, and the viscosity of the recording liquid is suitable for ink absorption, so the ink applied to the surface of the ink transport layer quickly connects to the transparent layer (base material) and the ink. The ink reaches the ink retaining layer between the transport layer and is strongly retained. Therefore, the amount of ink present in the ink transport layer is small, and the concentration of ink on the inner surface of the transparent layer is high (and no bleeding occurs), so the image seen from the transparent layer side has a glossy surface and a low optical density and resolution. The result is a highly sharp image.In addition, as a transparent layer, for example, polyester film (water resistance, light resistance,
By using a transparent film with excellent abrasion resistance, anti-blocking properties, optical properties, etc., images having these excellent properties can be formed. Further, by imparting a desired pattern to the transparent film in advance, an even more excellent image can be obtained.

Therefore, according to the present invention, by printing characters or the like with a mirror surface in the case of characters, etc., it exhibits excellent ink absorption, and has excellent image density, surface gloss, clarity, and water resistance. , images having light resistance and excellent storage stability can be easily provided all at once.

Claims (7)

[Claims] (1) A method of recording using a recording liquid on a recording material having an ink transport layer and an ink holding layer, characterized in that the viscosity of the recording liquid at 25° C. is 50 cp or less. Method. (2) Claim 1 in which the recording liquid contains a water-soluble dye
Recording method described in section. (3) The recording method according to claim 1, wherein the recording material is formed by laminating the ink retaining layer and the ink transport layer on a base material. (4) The recording method according to claim 1, wherein the ink transport layer of the recording material has light diffusing properties. (5) The recording method according to claim 1, wherein the ink transport layer of the recording material is mainly composed of particles that do not stain the recording agent and a binder. (6) The recording method according to claim 1, wherein the ink transport layer of the recording material is porous. (7) The recording method according to claim 1, wherein the ink retaining layer of the recording material is non-porous.