JPS62152779A - Recording material - Google Patents

Abstract

PURPOSE:To obtain an ink jet recording material excellent in ink receptivity, clearness of recorded images and surface luster and particularly suitable for obtaining high-resolution images, by setting the ink absorption rate of the upper one of adjacent coating layers to be higher than that of the lower one. CONSTITUTION:When providing at least two coating layers on a base by using water-soluble or hydrophilic polymers to provide an ink-receiving layer, the ink absorption rate of the upper one of the adjacent coating layers is set to be higher than that of the lower one. A water-soluble or hydrophilic polymer has an intrinsic ink absorption rate, which can be easily found by providing a coating layer of the polymer in a specified thickness, applying a specified quantity of a water base ink to the surface of the coating layer, and measuring the period of time necessary for the ink to be absorbed. On the basis of the ink absorption rates thus measured, two or more coating layers are so provided on the base that the ink absorption rate of the upper one of the adjacent coating layers is higher than that of the lower one.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a recording material suitably used in a recording method using aqueous ink, and particularly to a recording material suitably used in an inkjet recording method. , relates to a recording material that is excellent in the clarity of recorded images, storage stability, surface gloss, etc.

(Prior art) Recording methods using water-based ink include direct recording with water-based felt-tip pens, line markers (highlighters), fountain pens, etc., pen plotters using these, and new recording methods. Inkjet recording methods and the like are known.

The inkjet recording method uses various ink (recording liquid) ejection methods, such as an electrostatic suction method, a method that applies mechanical vibration or displacement to the ink using a piezoelectric element, and 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 attaching some or all of them to a recording material such as paper, but it generates little noise, prints at high speed, and prints in multiple colors. It is attracting attention as a recording method that allows printing.

Ink for inkjet recording is mainly composed of water for safety and recording characteristics, and polyhydric alcohols are added to prevent nozzle clogging and improve ejection stability. In 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.

That is, ink absorption is as quick as possible;
It is necessary that the ink bleeds appropriately. Furthermore,
In order to perform color inkjet recording using color ink, the dye used as the recording agent must have excellent color development and clarity.
A recording material that provides high color properties is required.

Furthermore, recorded images recorded by inkjet recording are required to have excellent storage stability and durability.

In addition, images recorded by the inkjet recording method have traditionally been used exclusively for surface image observation, but as the performance of inkjet recording devices has improved and become more widespread, recording materials suitable for purposes other than surface image observation have become available. is becoming required.

Other uses for recording materials other than surface image observation include those used to project recorded images onto a screen, etc., and observe those images using an optical device such as a slide or OHP (auto/black head projector). 1. Used for color separation plates when creating positive plates for color printing, color displays such as liquid crystals, etc. Examples include N6CMF (color mosaic filter).

When the recording material is used for surface image observation, the diffused light of the recorded image is mainly observed. The transmitted light becomes a problem. Therefore, it is required to have excellent light transmittance, especially linear light transmittance, in addition to the above-mentioned performance requirements of the general recording material for inkjet recording.

(The problem that the invention is trying to solve) However,
The reality is that there is still no known recording material that satisfies all of these required performances.

In addition, many conventional recording materials for surface image observation have a porous ink-receiving layer on one surface, and the ink is received in the porous voids to fix the recording material. The surface of the recording material was not glossy due to the nature of the recording material.

On the other hand, when the surface of the ink-receiving layer is non-porous, non-volatile components such as polyhydric alcohols in the ink remain on the surface of the recording material for a long time after recording, and the drying and fixing time of the ink is long. There are disadvantages in that clothing may get dirty or the recorded image may be damaged if it comes into contact with the recorded image.

However, as mentioned above, there is a strong demand for a recording material that is translucent or has a glossy surface, and in the case of these types of recording materials, the surface of the recording material is non-porous. This is a necessary condition. In response to such demands, recording materials using water-soluble polymers have conventionally been used to form non-porous ink-receiving layers in order to improve ink affinity and ink receptivity.

In a recording material in which an ink-receiving layer is formed using such a water-soluble polyester, when the base material used is a hydrophobic base material such as a polyester film, an ink made of a water-soluble polymer may be used. Since the receptor layer and the base material have contradictory properties, a problem arises in that the adhesion between the two is insufficient. In particular, when recording is performed using water-based ink, the ink-receiving layer made of a water-soluble polymer is moistened by the water-based ink, reducing film strength.
In addition, the water-based ink spreads at the interface with the substrate, further reducing its adhesion to the substrate, and if a finger or other object comes into contact with the recording section, the printed section will peel off along with the ink-receiving layer. Problems such as these are occurring.

This problem is even more pronounced with water-soluble polymers that have a high ink absorption speed, because the film strength of the ink-receiving layer decreases when water-based ink is absorbed. In order to achieve this, significant restrictions are placed on the selection of water-soluble polymers.

Accordingly, an object of the present invention is to provide an inkjet recording material that has excellent ink receptivity, sharpness of recorded images, and surface gloss, and is particularly suitable for obtaining high-definition images.

Another object of the present invention is to use an optical device such as a slide or an OHP to project a recorded image onto a screen for observation, a color separation plate for creating a positive plate for a color stamp, or a color separation plate for a liquid crystal display. C used for display
An object of the present invention is to provide a recording material for inkjet recording that can be used for observation of transmitted light such as MF.

The above and other objects of the invention are achieved by the invention as follows.

(Disclosure of the Invention) That is, in a recording material having a coating layer of 2M or more on a base material, the ink absorption speed of the upper layer of each adjacent coating layer is higher than the ink absorption speed of the lower coating layer. This recording material is characterized by its large size.

To explain the present invention in more detail, one of the inventors of the present invention will explain the present invention in more detail.

In general, there are problems such as those mentioned above in recording materials in which an ink-receiving layer made of a water-soluble polymer is formed on a highly hydrophobic base material, especially a decrease in the film strength of the ink-receiving layer in the printed area due to water-based ink, and As a result of extensive research into problems such as reduced adhesion, we found that even on hydrophobic substrates, when forming a coating layer (ink-receiving layer) with a specific structure on top of the hydrophobic substrate,
It has now been found that various drawbacks of the prior art, such as those mentioned above and discussed above, are overcome.

The recording material of the present invention generally consists of a base material as a support and a coating layer provided on the surface thereof, that is, an ink-receiving layer.For example, as a particularly preferred embodiment, (1) the base material and the ink-receiving layer. Examples include (2) an embodiment in which all of the recording materials are translucent and the recording material as a whole is translucent, and (2) an embodiment in which the surface of the ink-receiving layer is smooth and glossy.

Further, each ink receiving layer may also function as a support at the same time.

The present invention will be explained in more detail using the above preferred embodiments as representative examples.

As the base material used as the support for the ink-receiving layer in the present invention, any conventionally known base material such as transparent or opaque base material can be used. Examples suitable for the transparent base material include, for example, polyester resin, diluted resin, etc. Examples include films or plates of acetate resins, triacetate resins, acrylic resins, polycarbonate resins, polyvinyl chloride resins, polyimide resins, cellophane, celluloid, and glass plates. Preferred examples of the opaque substrate include ordinary paper, cloth, wood, metal plates, synthetic paper, and the like, as well as the above-mentioned transparent substrates treated to make them opaque by known means.

Such a base material preferably has a thickness of about 1 to 200 gm.

In the present invention, the ink-receiving layer provided on the base material as described above is formed from two or more coating layers, and is mainly made of a water-soluble to hydrophilic polymer that quickly absorbs and receives water-based ink. form from. Preferred examples of such polymers include albumin, gelatin, casein, starch, cationic starch, gum arabic, natural resins such as sodium alginate, polyamide, polyacrylamide, polyvinylpyrrolidone, polyvinyl alcohol, ion-modified polyvinyl alcohol, and polyether. Polyol, phenolic resin, alkyd resin, melamine resin, polyurethane resin, cellulose derivative, poly(meth)
Wood-loving monomers such as acrylic acid (salts and esters thereof), (meth)acrylic acid, (meth)acrylamide, crotonic acid, itaconic acid, maleic anhydride, vinyl sulfonic acid, vinyl acetate, vinyl chloride, olefin, Any conventionally known water-soluble to hydrophilic polymers such as copolymers with (meth)acrylic esters and other hydrophobic monomers can be used.

An important point in the present invention is that when forming an ink-receiving layer on a base material using two or more coating layers using water-soluble to hydrophilic polymers as described above, the upper layer of each adjacent coating layer is different from the lower layer. The point is to increase the ink absorption speed. Each of the above water-soluble to hydrophilic polymers has a unique ink absorption speed, and the magnitude of the ink absorption speed is determined by, for example, forming a coating layer of a specific thickness on a specific polymer, and This can be easily determined by depositing a predetermined amount of water-based ink on the surface and measuring the time it takes for the ink to absorb water.

Here, the aqueous ink referred to in the present invention is an ink in which the water content of the liquid medium is 20 to 100%, and the ink absorption speed measured for the above-mentioned ink is applied to the present invention.

The most desirable form of the present invention is to achieve the object of the present invention with any water-based ink, but if used for a specific purpose, only with a specific ink.
Any recording material that achieves the object of the present invention may be used.

Therefore, in the present invention, it is desirable that the upper layer has a high ink absorption speed for any water-based ink, but it is essential that the upper layer has a high ink absorption speed for at least any of the water-based inks in the above range. It is.

The method for measuring the ink absorption speed in the present invention is as follows:
One method is to determine the ink absorption speed by depositing a certain amount of ink using a specific inkjet recording device and measuring the time until the ink stops being transferred to a sheet of paper stacked on the ink deposited area. Of course, such a method is just an example, and the ink absorption rate of any water-soluble to hydrophilic polymer can be easily determined by any method, such as 1° or more. Based on these ink absorption speeds, two or more coating layers may be formed on the base material such that the ink absorption speed of the upper layer is higher than the ink absorption speed of the lower layer.

As a method for forming such an ink-receiving layer, a coating solution is prepared by dissolving or dispersing the above-mentioned water-soluble to hydrophilic polymer in an appropriate solvent, and the coating solution is coated by, for example, a roll coating method, A method in which the polymer is coated on a substrate by a known method such as a rod bar coating method, a spray coating method, an air knife coating method, and then dried immediately, a method in which the above polymer is hot-melt coated, or a method in which the above polymer is once coated alone Other methods may also be used, such as forming a film for the ink-receiving layer in advance and laminating the film to the above-mentioned base material.

In the present invention, by any of these methods,
The ink-receiving layer is formed by forming two or more coating layers and selecting a polymer material such that the ink absorption speed of the upper layer is higher than the ink absorption speed of the lower layer.

In the present invention as described above, the total thickness of two or more layers (ink receiving layer) formed on the base material is usually 0.1
There is no particular restriction as long as the layer is m or more, and practically, 0.5 to
It is about 30 ILm.

In addition, there is no particular limit to the thickness of each layer, and the thicknesses can be changed depending on the balance of ink absorption speed, adhesion, anti-blocking properties, and various other performance requirements required for the ink-receiving layer. good.

The recording material of the present invention is obtained as described above, but the coating layer in such a recording material may have a structure of two or more layers, for example, it may have a multilayer structure of three layers, four layers, or more. Of course it's good.0 For example, in the case of a three-layer structure, each layer has an ink absorption speed of the top layer>middle layer>
The same applies to a structure of four or more layers, which may be the lower layer (layer in contact with the base material).

By having the coating layer (ink-receiving layer) having the above-described structure, the recording material of the present invention exhibits excellent ink absorption speed and has good adhesion between the base material and the ink-receiving layer. In particular, during recording when water-based ink is applied, the adhesion between the base material and the coating layer does not deteriorate even in the printed area where water-based ink is applied, and has excellent printed area durability. It is.

Although there are many unknown points regarding the reason why a recording material having the above-mentioned characteristics can be obtained by the present invention, according to the imagination of the present inventors, both the upper layer and the lower layer are made of water-soluble to hydrophilic polymers. Because of this structure, even after the upper layer receives water-based ink and becomes brittle, both layers have sufficient adhesion, and as the water-based ink permeates from the upper layer to the lower layer, the interface between them Since the polymers constituting both layers are in a compatible state, the bond between the upper layer and the lower layer is strengthened, especially in the printed area.

On the other hand, since the lower layer provided below the upper layer has a lower ink absorption speed than the upper layer, the water-based ink absorbed by the upper layer is absorbed faster than it is absorbed by the lower layer through the interface between them. Since it will diffuse in a direction parallel to
Most of the water-based ink received on the recording material is retained within the upper layer.

As a result, the amount of ink retained in the lower layer is minute, so the film strength of the lower layer is not reduced and the adhesion to the substrate is improved. Therefore, when the recording material of the present invention has a three-layer structure, the same effect can be obtained between the intermediate layer and the lower layer. Effective.

Therefore, in the present invention, a water-soluble to hydrophilic material that has conventionally had an excellent ink absorption speed but could not be used in practice for forming an ink-receiving layer due to insufficient adhesion with the base material. Since the ink-receiving layer can be formed using a high-quality polymer, it is possible to provide a recording material having an ink absorption speed superior to that of recording materials of the prior art.

The recording material of the present invention is formed as described above, and a preferred embodiment of the above (1) is that both the base material and the ink-receiving layer are translucent, and the in-line transmittance is 105 or more,
This is an embodiment in which the recording material as a whole is translucent.

The recording material of this embodiment is particularly excellent in translucency, and is used in OHP applications in which recorded images are projected onto a screen or the like using an optical device.
It is mainly used in cases such as the following, and is useful as a recording material for transmitted light observation.

Such a translucent recording material can be prepared by forming a translucent ink-receiving layer from a mixture of the water-insoluble polymer and cationic resin on the translucent substrate as described above. I can do it.

In the present invention, sufficient light transmittance means that the recording material preferably exhibits a linear transmittance of at least 2%, preferably 10% or more.

If the in-line transmittance is 2% or more, it is possible to project the recorded image onto a screen and observe it using an OHP, and furthermore, in order to clearly observe the details of the recorded image,
It is desirable that the in-line transmittance is 10% or more.

The linear transmittance T (%) here refers to the incident perpendicular to the sample, transmitted through the sample, and at least 8
The spectral transmittance of the straight light that passes through the light-receiving side slit on the extension line of the incident optical path separated by more than cm and is received by the detector is 1. The Y value of the tristimulus value of the color is determined from the measured spectral transmittance, and is determined by the following equation.

”r=y/y, X 100 (1)T;
Linear transmittance Y: Y value of sample Y; Y value of blank Therefore, the linear transmittance referred to in the present invention is for straight light, and the diffuse transmittance (an integrating sphere is installed behind the sample to capture diffused light) ) and opacity (
The white and black backings are placed on the back of the sample and the ratio is calculated. ), which evaluates translucency using diffused light.

Since the behavior of straight-line light is a problem with devices that use optical technology, it is important to evaluate the straight-line transmittance of the recording material when evaluating the translucency of the recording material to be used in these devices. Asking is especially important.

For example, when observing a projected image on an OHP, in order to obtain a clear and easy-to-see image with high contrast between recorded and non-recorded areas, the non-recorded areas in the projected image must be bright;
That is, the in-line transmittance of the recording material is required to be at a certain level or higher. In the test using the OHP test chart.

In order to obtain an image suitable for the above purpose, the in-line transmittance of the recording material needs to be 2% or more, and in order to obtain a clearer image, it is preferably 105 or more. Therefore, a recording material suitable for this purpose needs to have a linear transmittance of 105 or more.

The preferred embodiment of (2) above is also one of the embodiments of (1) above, in which the surface of the ink receiving layer is smooth and JISZ
It is characterized by a 45 degree specular gloss based on 8741 of 30% or more.

This type of recording material has particularly excellent surface gloss, and is particularly useful as a recording material for observing surface images in full color and excellent clarity. The recording material in this embodiment may be transparent or opaque, and either the above-mentioned transparent or opaque base materials can be used. The ink receiving layer formed on these base materials may also be transparent or opaque.
The materials and methods used to form the ink-receiving layer are the same as those in embodiment (1) above, but the filler, etc., can be used to make the ink-receiving layer opaque as long as the surface of the ink-receiving layer can maintain smoothness. You may use it to the extent that it suits you.

If necessary, a cast coating method may be used in addition to the above-mentioned coating method, or glossing may be performed using a gloss roll.

Further, in the present invention, fine organic or inorganic powder is applied to the recording surface of the recording materials of various embodiments as described above at a rate of about 0.01 to about 1.0 g/rn'. By doing so, it is possible to further improve the transportability in the printer, the blocking resistance during stacking, the fingerprint resistance, etc. of the obtained recording material.

The present invention has been explained above by illustrating typical aspects of the recording material of the present invention, but of course the recording material of the present invention is not limited to these aspects. Also, the ink-receiving layer contains 1 dispersant, fluorescent dye, p
Various known additives such as H regulators, antifoaming agents, lubricants, preservatives, and surfactants can be included.

Note that the recording material of the present invention does not necessarily have to be colorless, and may be a colored recording material.

The recording material of the present invention as described above is a recording material having an ink receiving layer consisting of two or more coating layers, and has excellent ink receptivity, adhesion of the printed area, durability, clarity, and gloss. This method solves the problems of conventional technology, such as the printed part peeling off from the base material even if a finger or an object comes into contact with it during or after printing. be.

In the present invention, it is possible to provide an excellent surface gloss that has not been seen in conventional inkjet recording materials, and also by projecting the recorded image onto a screen or the like using an optical device such as a slide or OHP. It can be applied to applications other than conventional surface image observation, such as those used for observation, color separation plates when creating a positive plate for color printing, or CMF used for color displays such as liquid crystals.

Hereinafter, the present invention will be explained in more detail by giving Examples, Comparative Examples, and Usage Examples. Note that parts and percentages in the text are based on weight.

Example 1 A polyethylene terephthalate film (manufactured by Toshi) with a thickness of 100 ILm was used as a translucent base material, and coating solution A having the following composition was applied on this film to a film thickness of 21 parts m after drying.
Apply by bar coater method and heat at 100℃ so that
After drying for 10 minutes at 80°C to form a coating layer (lower layer), the following coating solution B was applied onto the coating layer (lower layer) to a dry film thickness of 6 gm. A coating layer (upper layer) was formed by drying for a minute to obtain a translucent recording material of the present invention.

1 process 5 plate comb type polymer (LHM-108, manufactured by Soken Chemical) <25%
Methyl cellosolve solution> (The above comb-shaped polymer was obtained by graft polymerizing 20 parts of methyl methacrylate macromonomer to a copolymer backbone chain consisting of 64 parts of 2-hydroxyethyl methacrylate and 16 parts of N,N-dimethylacrylamide. (It is a graft polymer.) Coating material: Cation-modified polyvinyl alcohol (PVA-C-318-2A, manufactured by Kuraray) 1
0 parts water
90 parts Example 2 The same polyester film as in Example 1 was used as the base material, and the following coating solution C was applied onto this film using a bar coater method so that the film thickness after drying was 14 m.
It was dried at 130° C. for 30 seconds to form a coating layer (lower layer).

Next, a coating layer (intermediate layer) is formed on the coating layer (lower layer) using coating liquid A similar to that in Example 1, and a coating liquid similar to that in Example 1 is further applied on the coating layer (intermediate layer). By B, the coating layer (
The upper layer) was formed in the same manner as in Example 1 to obtain a translucent recording material of the present invention.

Polyester resin (Byron 20S, manufactured by Toyobo), (1
0% toluene/MEK solution> 10 parts Polyisocyanate resin (Coronate Nippon Polyurethane) (l O% toluene/MEK solution> 1 part Example 3 The same polyester film as in Example 1 was used as the base material, and this Coating liquid A shown below was applied onto the film so that the film thickness after drying was 4 μm, and dried at 100° C. for 10 minutes to form a coating layer (lower layer).

Next, coating liquid B below was applied onto the coating layer (lower layer) so that the dry film thickness was 1 m, and dried at 80°C for 10 minutes to form a coating layer (upper layer). A transparent recording material of the present invention was obtained.

1. All polyvinylpyrrolidone (PVP K-90, manufactured by GAF,
) (10% [1MF solution) 70 parts isobutylene/maleic anhydride copolymer (isopan 10, manufactured by Clarei Soprene) (10% DMF solution> 30
Part 1 Hydroxyethyl cellulose (HECAM-15, manufactured by Fuji Chemical) 2 parts Water 98 parts Example 4 The same polyester film as in Example 1 was used as the base material, and the following coating was applied on this film. Liquid A was applied so that the film thickness after drying was 21 parts m, and dried at 140° C. for 15 minutes to form a coating layer (lower layer).

Next, coating liquid B below was applied onto the coating layer (lower layer) so that the dry film thickness was 6 μm, and dried at 80° C. for 10 minutes to form a coating layer (upper layer). A transparent recording material of the present invention was obtained.

Next two-part AI photocation-modified polyvinyl alcohol (PVA-C-318-2A, manufactured by Kuraray) <10% aqueous solution> 50 parts Water-soluble polyester polyisocyanate resin (Elastron E-37, Dai-Kogyo Seiyaku type) (25% Aqueous solution> 2.5 parts crosslinking agent (
Catalyst) (Elastron Catalyst 32, Kogyo Seiyaku type) 0.2 parts Water-soluble epoxy resin (Denacol EX-E114B manufactured by Nagase Chemical Industries) <90% aqueous solution> 0.2 parts Polyvinyl alcohol (with a risk of plagiarism) PVA-217, manufactured by Kuraray)
5 parts polyvinylpyrrolidone (
PVP K-90, made by GAF)
5 parts water
90 parts Comparative Example 1 A comparative recording material having a single coating layer was obtained in the same manner as in Example 1 except that coating liquid A was not used.

Comparative Example 2 The same polyester film as in Example 1 was used as the base material, and coating liquid B used in Example 3 was applied onto this film.
A coating layer (lower layer) was formed in the same manner as in Example 2 using
Next, a coating layer (upper layer) was formed using coating liquid A in the same manner as in Example 2 to obtain a recording material for comparison.

Both the recording material of the present invention and the comparative recording material obtained as described above were colorless and transparent.

Usage Example For the recording materials of the above Examples and Comparative Examples, the following 4
On-demand inkjet recording head that uses seed ink to eject ink using a piezoelectric vibrator (discharge orifice diameter 60 m, piezoelectric vibrator drive voltage 70V)
, frequency 2 KHz).

Direct ink (composition) C1■, Direct Yellow 86 2 parts diethylene glycol 20 parts polyethylene glycol #200 10 parts water
7 o part line zl (composition) C, 1, acid red 35 2 parts diethylene glycol 20 parts polyethylene glycol #200 10 parts water
70 parts Li21 (composition) C, 1, Direct Blue 86 2 parts diethylene glycol 20 parts polyethylene glycol #200 10 parts water
70 parts (composition) C, 1, food black 2 2 parts diethylene glycol 20 parts polyethylene glycol #200 10 parts water
70 copies The evaluation results of the recording materials of the Examples and Comparative Examples are shown in Table 1.

Each evaluation item in Table 1 was measured according to the following method.

(1) Ink fixation time is determined by leaving the recording material after recording at room temperature (20°C, 65% RH) and touching the recorded image with your finger, the ink will dry and will no longer stick to your finger. The time was measured.

(2) OHP suitability was measured as a representative example of optical equipment, and the recorded image was projected onto a screen using OHP.
Judgment is made by visual observation. 0 indicates that the non-recorded area is bright, the OD (optical density) of the recorded image is high, and a clear and easy-to-see projected image with high contrast is obtained, while the non-recorded area is slightly dark and the recorded image is 0. If the OD of the image is slightly low and the line of pitch width 0.51 set thickness 0.25 multilayer cannot be clearly distinguished, Δ, the non-recorded area is quite dark, the OD of the recorded image is quite low, pitch width 1+u+, Sa0.3
A sample in which the mm line could not be clearly distinguished or a non-recorded area and a recorded image could not be distinguished was rated as "×".

(3) Straight line transmittance was determined by measuring the spectral transmittance using a 323-type Hitachi self-recording spectrophotometer (manufactured by Hitachi, Ltd.), keeping the distance from the sample to the light-receiving side at approximately 9 cm. ) was calculated using the formula.

(4) The adhesion test of the printed part was determined by adding cuts at 5ffi11 intervals to the printed part of the recording material with a cutter knife 30 minutes after printing, and then adhering cellophane tape to the printed part and then peeling it off. 0 for non-peeling, X for peeling
And so.

(Left below) -Proof Gl: 622 Maru JJL U-! LUL (Evaluation item) 1234 12
[Sex 1 minute 1 minute Within 1 minute 3 minutes 1 minute 1 minute m sex oooo o.

Claims (2)

[Claims] (1) A recording material having two or more coating layers on a base material, characterized in that the ink absorption speed of the upper layer of each adjacent coating layer is higher than the ink absorption speed of the lower coating layer. recording material. (2) The recording material according to claim (1), wherein the two or more coating layers are both made of a water-soluble to hydrophilic polymer.