JPS62264986A - Recording material and recording method employing the same - Google Patents

Abstract

PURPOSE:To provide proper luster onto a recording screen and to improve the optical density, the light resistance, the hue, etc. by laminating an ink layer having light diffusion performance and an ink holding layer having light transmission performance onto a substrate thus forming a recording material. CONSTITUTION:An ink holding layer having light transmission performance is provided on a plastic or a glass board substrate then an ink transportation layer having light diffusion performance is laminated thereon thus forming a recording material. Preferably, the transmittance of light of the recording material is lower than 85% and the basic material has light transmission performance. Preferably, the ink transportation layer is porous and mainly composed of particles which do not dye the recording agent and a binding agent. Preferably, the ink holding layer is not porous and composed of a water soluble or hydrophilic polymer as a main constituent.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording material suitable for a recording method using ink, such as a felt pen, a fountain pen, a pen plotter, an inkjet recording device, etc. The present invention relates to a recording material with excellent light resistance, storage stability, etc., and a recording method for obtaining such high-quality recorded images.

(Prior Art) Conventionally, recording methods using ink, such as writing with a fountain pen, felt pen, ballpoint pen, etc., pen plotter,
Examples of the recording material used for recording with an inkjet recording apparatus include general paper such as high-quality paper, bond paper, and writing paper, and coated paper such as art paper and cast coated paper.

However, in recent years, with the development of recording devices such as inkjet recording devices and pen plotters, sufficient recording characteristics have not been obtained with the above-mentioned conventional recording materials.

In other words, in recent recording methods such as those described above, high-speed recording and multi-color recording are performed that are incomparable to conventional methods.
Conventional recording materials have not reached satisfactory levels in ink absorption, color development when a plurality of inks are deposited on the same location, chromaticity, and the like.

In order to solve these problems, coated paper, such as inkjet paper, has been devised which has a porous ink absorbing layer on the surface of the base material. For example, JP-A-60
Japanese Patent No. 214989 describes a sheet having a porous ink-absorbing resin layer provided on a base material.

This ink absorption layer is porous and contains pores and cracks inside, which improves the ink absorption speed.

In this way, by providing a porous ink absorption layer,
Although it is possible to increase ink absorption to some extent,
Since the absorption layer is porous, the recording material has light diffusing properties, making it impossible to obtain clear recorded images with high optical density and glossy recorded images.

In addition, since the recorded image is observed from the ink recording surface, the recording agent is configured to remain as much as possible on the surface of the absorbing layer, which has the disadvantage that the durability and storage stability of the image, such as water resistance and abrasion resistance, are inferior. There is.

As one method for solving such problems, a recording medium disclosed in, for example, Japanese Unexamined Patent Publication No. 136480/1980 is known. This recording medium has at least one ink-receiving layer provided on a support, and the formed image is observed from the support. This method satisfactorily solves various performance problems such as water resistance on the viewing surface, but a large amount of pigment is used to increase the whiteness of the ink-receiving layer, and as a result, although the whiteness is high, there is no adhesion. The ink absorbed by the pigment is absorbed by the pigment, and the amount of ink that reaches the interface between the ink-receiving layer and the support is reduced, making it impossible to achieve a sufficiently high image density on the viewing surface, and also resulting in poor color quality and resolution. There is a drawback.

Furthermore, since the ink-receiving layer containing pigment as a main component is directly adjacent to the support, the ink and recording agent are retained within the pores of the ink-receiving layer, and the ink can be removed by immersion in water. Also, there is a drawback that the recording agent is eluted and the water resistance is extremely poor.

In addition, recently, as the speed and quality of recording using inkjet recording devices, pen plotters, etc. has increased, there has been a demand for recording materials with dramatic recording performance.

In other words, it is a recording material that is significantly superior to conventional recording materials in all aspects of recording performance, including ink absorption, recording agent color development, recorded image light resistance, resolution, color, recorded image density, storage stability, and gloss. has become necessary.

As a result of research in order to provide a recording material as described above, the present inventor has developed a recording material having a specific configuration, which has an ink transport layer and an ink retention layer, and in which the recording surface and the image viewing surface are in a front-back relationship. I suggested it before.

However, in the recording materials of these prior inventions,
Problems arose, including the ink absorbency of the formed ink transport layer, its strength, its relationship with the ink retaining layer, and the quality of the images formed, but that when one type of performance was attempted to be improved, other performances deteriorated.

For example, if the thickness of the ink transport layer is increased to improve ink absorption, the image density will decrease, if it is too thin, the resolution will decrease, and if too many resin particles are added, the ink transport layer will crack. In addition, if the resin particles were too small, various problems such as insufficient ink absorption, insufficient color properties, and insufficient resolution occurred.

Therefore, the above-mentioned recording materials exhibit excellent ink absorption, water resistance, anti-blocking properties, etc. during recording, and after recording, they exhibit excellent color properties, high image density, resolution, etc.
There is a demand for a recording material that can provide images with image quality such as light resistance and storage stability.

(Problems to be Solved by the Invention) However, at present, a recording material that simultaneously satisfies all of these recording characteristics has not yet been obtained.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a recording material that has a moderate gloss on the surface and allows recording images with excellent optical density, light fastness, color properties, etc. to be obtained.

A further object of the present invention is to provide a recording material from which recorded images can be obtained that are excellent in water resistance, abrasion resistance, resolution, storage stability, visibility, etc.

The above object is achieved by the present invention as follows.

(Means for Solving the Problems) That is, the first aspect of the present invention is a recording material having an ink transport layer and an ink retention layer, wherein the ink transport layer is light diffusive and the ink retention layer is This is a recording material characterized in that it is translucent.

Furthermore, a second aspect of the present invention is a recording method for recording with ink on the recording surface of a recording material having an ink transport layer and an ink holding layer, the ink transport layer of the recording material having a light diffusing layer. This recording method is characterized in that the ink retaining layer is transparent and the ink retaining layer is transparent.

(Function) Unlike conventional recording materials in which the recording surface and the observation surface are the same, the recording material of the present invention has the recording surface and the observation surface facing each other, and the ink transport layer has a light-diffusing layer. The main characteristics are that the ink retaining layer is transparent and the ink retaining layer is transparent.

That is, in the recording material of the present invention, recording is basically performed using ink on the ink transport layer, which is the recording side, and the recorded image is observed from the ink retaining layer side, which is the observation side.

The ink transport layer, which is the first feature of the present invention, has liquid permeability and has the function of quickly absorbing and transmitting ink attached to its surface, while the ink retaining layer transfers the ink from the ink transport layer. It has the function of absorbing and retaining ink or recording material.

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

Therefore, the ink transport layer is constructed by selecting a material that has properties such as digging, penetration, and diffusion for the ink medium, but does not have properties such as adsorption, penetration, and reaction for the recording material. There must be.

The ink retaining layer, which is the second feature of the present invention, must have a stronger ability to absorb ink than the ink transport layer in order to stably absorb and capture the ink temporarily absorbed by the ink transport layer.

Therefore, the ink retaining layer must have high affinity for the recording agent as well as for the ink medium.

The third feature of the present invention is that the ink transport layer of the recording material having the above-mentioned structure is light-diffusing, and the ink-retaining layer is light-transmitting.

That is, in the recording material of the present invention having the above-mentioned basic structure, after an image is formed, the ink retaining layer side or the transparent base material side becomes the observation surface, and the ink transport layer is exposed to light. By making the ink retaining layer diffusive, the image formed on the ink retaining layer has a bright background with light diffusivity and appropriate whiteness, so the image on the ink retaining layer has even higher contrast. Both image qualities such as image density, color, and sharpness are improved. By making the ink holding layer containing the image translucent, most of the light incident from the observation surface reaches the light diffusive ink transport layer and is diffused there, further improving the image quality. there were.

Furthermore, with the above configuration, even when light is incident from the ink transport layer, that is, the recording surface, the incident light is diffused by the ink transport layer, so the background of the image seen from the viewing surface is very low. The image becomes brighter and the color, sharpness, brightness, chroma, etc. of the image formed on the ink retaining layer are improved.

Therefore, the overall light transmittance of the recording material of the present invention is also important, and if the overall light transmittance is too large, the above effects will be lost, so the overall light transmittance is 85.
% or less. Also, as mentioned above, in order to make the background of the image brighter from the recording surface, it is better to have a certain level of light transmittance.For this purpose, it is most preferable that the light transmittance of the entire recording material be 65 to 10%. The best image quality is achieved when .

Incidentally, the light transmittance as used in the present invention is a value expressed by the following formula.

Light transmittance (Tt) = T+ /T2 x 100 (%
) T1: Total incident light amount T2: Total transmitted light amount Specifically, the light that has passed through the recording material is
Light is collected and detected using an integrating sphere treated with magnesium oxide (nearly ideal white) and a standard plate treated with the same MgO, and indicates the percentage of light transmitted.

Hereinafter, the present invention will be explained in more detail based on preferred embodiments.

The recording material of the present invention includes a base material as a support, a translucent ink retention layer formed on the base material that absorbs and captures the ink or recording agent, and a light-transmitting ink retention layer formed on the ink retention layer. It is formed of a light-diffusing ink transport layer that directly receives ink, has liquid permeability, and leaves virtually no recording material behind.

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, any conventionally known base material can be used, and specifically, polyester resin, diacetate resin, triacetate resin, polystyrene resin, polyethylene resin, polycarbonate resin, polymethacrylate resin, cellophane, celluloid. Examples include plastic films, plates, and glass plates made of polyvinyl chloride resin, polyvinyl chloride resin, polyethylene resin, polyimide resin, and the like. The thickness of these base materials may be any thickness, but is generally about 1 μm to 5.000 μm.

Note that, as described above, in the present invention, since a recorded image is observed from the side opposite to the recording side, the base material needs to have light-transmitting properties.

In addition, as long as the base material used finally has translucency, any processing can be applied to the base material. It is possible to apply Furthermore, by selecting a base material having water resistance, abrasion resistance, etc., it is also possible to impart water resistance, abrasion resistance, etc. to the image observation surface of the recording material.

The ink transport layer constituting the recording material of the present invention needs to have at least light diffusivity and liquid permeability. The term "liquid permeability" used in the present invention refers to a property that allows ink to pass through the layer quickly and does not allow the recording agent in the ink to substantially remain in the ink transport layer. A preferred embodiment for improving the liquid permeability of the ink transport layer is one in which the ink transport layer has a porous structure with cracks and communication holes inside.

Furthermore, as described above, in the present invention, in order to observe a reflective recorded image from the opposite side of the recording surface, the ink transport layer needs to have light diffusing properties.

The ink transport layer that satisfies the above characteristics is preferably mainly composed of particles that are non-stainable to the recording material and a binder.

Such particles include the recording agent in the ink, that is,
Any particles may be used as long as they do not substantially adsorb dyes, etc., and particularly suitable particles in the present invention include highly hydrophobic thermoplastic resins, thermoplastic resins, etc., since dyes in inks are generally water-soluble. Organic particles such as curable resins, such as polystyrene, polymethacrylate, elastomer, ethylene-vinyl acetate polymer, styrene-acrylic copolymer, polyester, polyacrylic, polyvinyl ether,
Resin powder such as polyamide, polyolefin, guanamine, SBR, polytetrafluoroethylene, chlorobrene, etc.
At least one of these emulsions and suspensions may be used as desired.

In addition, in order to increase the whiteness of the ink transport layer or adjust the light transmittance, inorganic pigments as white as not to impede the ink permeability of the ink transport layer, such as talc, calcium carbonate, calcium sulfate, magnesium hydroxide, etc. , basic magnesium carbonate, alumina, synthetic silica, calcium silicate, diatomaceous earth, aluminum hydroxide, clay, barylum sulfate, titanium oxide, zinc oxide, zinc sulfide, satin white, silicon oxide, lithopone, etc., light diffusing agents, fluorescence Dyes, colored dyes, etc. may be added.

Further, the binder used has a function of binding the particles to each other and/or to the ink retaining layer, and is preferably non-staining to the recording material like the particles.

Preferred materials for the binder include any conventionally known materials as long as they have the above-mentioned functions, such as polyvinyl alcohol, acrylic resin, styrene-acrylic copolymer, polyvinyl acetate, and ethylene-acetic acid. Vinyl copolymer, starch, polyvinyl butyral, gelatin, casein, ionomer, gum arabic, carboxymethylcellulose, polyvinylpyrrolidone, polyacrylamide, polyurethane resin, phenol, melamine, epoxy, styrene-butadiene rubber, urea resin,
Phenol resin, α-olefin resin, chlorobrene,
One or more resins such as 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 should be determined in order to obtain preferable ink transport properties, light diffusivity, and light transmittance.
The particle/binder ratio is preferably in the range of 1/3 to 50/1,
More preferably, it is in the range of 3/1 to 20/1. If there is too much binder in this mixing ratio, the ink transport layer will have fewer cracks and communicating pores, and the ink absorption effect and light diffusivity will decrease. On the other hand, if there are too many particles in the mixing ratio, although the light diffusivity is improved, the adhesion between the particles or between the ink retaining layer and the particles becomes insufficient, making it impossible to form an ink transport layer.

The thickness of the ink transport layer depends on the amount of ink droplets, but is preferably 1 to 200 μm, more preferably 3 to 80 μm.

Next, a non-porous ink retaining layer that substantially captures the ink or recording agent is transparent and absorbs and captures the recording agent in the ink that has passed through the ink transport layer, thereby substantially permanently retaining the ink or recording agent. It is something to keep.

The ink retaining layer needs to have a stronger ink absorption ability than the ink transport layer. This is because when the absorption power of the ink retention layer is weaker than the absorption strength of the ink transportation layer, the ink applied to the surface of the ink transportation layer passes through the ink transportation layer, and the tip of the ink reaches the ink retention layer. When the ink reaches the ink, the ink stays in the ink transport layer, causing the ink to permeate and diffuse laterally within the ink transport layer more than necessary at the interface between the ink transport layer and the ink retention layer. As a result, the resolution of the recorded image decreases, making it impossible to form a high-quality recorded image.

Furthermore, as described above, since the recorded image is viewed from the side opposite to the recording surface, the ink retaining layer needs to be translucent.

An ink retaining layer line that satisfies the above requirements, a light-transmitting resin that adsorbs the recording agent, and/or an ink that satisfies the above requirements.
12 companies W shelf stick right eggplant base: It is preferable to be composed of Bansu Koujohi Hashiri.

For example, when a water-based ink containing an acid dye or a direct dye is used as the recording material, the ink-retaining layer is made of a resin that has adsorption properties for the dye, such as a water-soluble resin that has swelling properties for the water-based ink. Preferably, the material is made of a wood-philic polymer. The material constituting the ink retaining layer is not particularly limited as long as it has the function of absorbing and trapping ink, forms a non-porous layer, and has translucency.

The thickness of the ink retaining layer is sufficient as long as it absorbs and captures ink, and although it varies depending on the amount of ink droplets, it is preferably 1 to 50 μm, more preferably 3 to 20 μm.
It is μm.

The material constituting the ink retaining layer may be any material as long as it can absorb water-based ink and retain the recording agent in the ink, but since the ink is mainly water-based, water-soluble or parent material may be used. Preferably, it is formed from a polymer with a polyamide. Examples of such water-soluble or hydrophilic polymers include albumin, gelatin, casein, starch, cationic starch, gum arabic, natural resins such as sodium alginate, carboxymethylcellulose, hydroxyethylcellulose, polyamide, polyacrylamide, polyethyleneimine, Synthetic resins such as polyvinylpyrrolidone, quaternized polyvinylpyrrolidone, polyvinylpyricillium halide, melamine resin, phenolic resin, alkyd resin, polyurethane, polyvinyl alcohol, ion-modified polyvinyl alcohol, polyester, and sodium polyacrylate, preferably these polymers Examples include hydrophilic polymers made water-insoluble by crosslinking, wood-philic and water-insoluble polymer complexes consisting of two or more types of polymers, and hydrophilic and water-insoluble polymers having hydrophilic segments.

As a method for forming an ink retaining layer and an ink transport layer on a base material, a coating solution is prepared by dissolving or dispersing the materials preferably mentioned above in a suitable solvent, and the coating solution is coated with, for example,
Preferably, the material is coated on a substrate 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., and then quickly dried. A method may also be used in which a single sheet is first formed from the material and then the sheet is laminated onto a base material.

However, when providing the ink retaining layer on the base material, it is preferable to strengthen the adhesion between the base material and the ink retaining layer by, for example, forming an anchor coat layer, and to eliminate spaces.

If a space exists between the base material and the ink retaining layer, the surface of the recorded image will reflect diffusely, which will substantially lower the optical density of the image, which is not preferable.

Means for recording images using the recording material of the present invention include fountain pens, ballpoint pens, felt pens, pen plotters, etc.
, ink mist, inkjet, various types of printing, and other recording devices and recording devices using ink containing a recording agent.

From the viewpoint of high-speed image recording, inkjet recording devices and pen plotters are suitable.

The ink used in the recording method of the present invention can be a conventionally known water-based and/or oil-based ink, but in order to quickly penetrate the ink transport layer and be quickly absorbed and captured by the ink retention layer, , the viscosity of the ink is 500 c
ps or less. Preferably, the viscosity is 100 cps or less, preferably 50 cps or less.

In addition, water-based inks are preferable in consideration of safety against fire and stain resistance against the environment.

As the recording agent contained in the ink, conventionally known coloring agents such as dyes and pigments and/or materials having color-developing properties can be used. For example, as the recording agent used in inkjet recording, water-soluble dyes such as direct dyes, basic dyes, reactive dyes, and food colorings are preferred.

In the recording method of the present invention, since the recording surface and the viewing surface are front and back, when printing characters, it is necessary to use a device that can print mirror characters, unlike conventional methods.
However, in the uninvented recording material, the ink transport layer can be made transparent by heating after recording, and in such a case, the recording surface can also be used as an observation surface. Therefore, in such a case, characters etc. may be recorded in a normal state.

(Examples) Hereinafter, the present invention will be specifically described based on Examples. Note that % or parts in the text are based on weight unless otherwise specified.

Example 1 A polyethylene terephthalate film (thickness 100 μm% Q-80D, manufactured by Toshi) was used as a translucent base material,
Composition A below was coated on this base material by a bar coater method so that the dry film thickness was 8 μm, and dried in a drying oven at 140° C. for 8 minutes.

Kokamono A Cation-modified polyvinyl alcohol (PVA-C-318-2A, manufactured by Kuraray, 10% DMF
solution) 100 parts water-soluble melamine resin (Sumimart 100, Sumimaru Kagaku Kogyo Co., Ltd., 10% aqueous solution) 4 parts styrene-acrylic acid copolymer Oxirac 5H-2100 Nippon Shokubai Kagaku, 10% aqueous solution) 2 parts The following Composition B was coated using a bar coater method to give a dry film thickness of 20 μm and dried in a drying oven at 90° C. for 7 minutes.

Kokamono 1 Low-density polyethylene resin (Chemipearl M-200, manufactured by Mitsui Petrochemical Industries, solid content 40%, 10
0 parts Polyvinyl acetate emulsion (Polysol 2N-5, manufactured by Showa Kobunshi, solid content 51%) 10 parts Polyoxyethylene octylphenyl ether (Emulgen 810, manufactured by Kao) 0.2 parts In this way, the overall light transmittance A milky-white recording material of the present invention in which the color was 50% was obtained.

Example 2 A polyethylene terephthalate film (thickness 100 μm, Q-77, manufactured by Toshi) was used as a translucent base material, and the following composition C was applied to the surface of this base material using a bar coater so that the dry film thickness was 5 μm. The coating was applied by the method and dried in a drying oven at 110°C for 10 minutes.

Red polyvinylpyrrolidone (PVP-90, made by GAF, 1
0% DMF solution) 84 parts styrene/acrylic acid copolymer (Oxirac 5H-2100
, Nippon Shokubai Chemical Co., Ltd., 1O% MF solution)
The following composition was coated on the 166 parts coating using a bar coater method to give a dry film thickness of 20 μm, and dried in a drying oven at 130° C. for 4 minutes.

Red synthetic resin and polymethacrylate resin (Microsphere M, manufactured by Matsumoto Aburashi Pharmaceutical Co., Ltd.) 100 parts Ionomer resin (Chemipearl 5A-100, manufactured by Mitsui Petrochemical Industries, Ltd., solid content 35
%) 30 parts Sodium dioctyl sulfosuccinate (Perex 0T-P, manufactured by Kao, solid content 70%) 0.
15 parts Water 35 parts The thus obtained recording material of the present invention was milky white with an overall light transmittance of 28%.

Example 3 The polyethylene terephthalate film used in Example 1 was used as a translucent base material, and the following composition A was applied on this base material.
was coated using a bar coater method to give a dry film thickness of 10 μm, and dried in a drying oven at 140° C. for 10 minutes.

Kouibutama cation-modified polyvinyl alcohol (PVA-C-31
8-2^, manufactured by Kuraray, 10% aqueous solution) 100 parts isocyanate compound (Elastron C-9, manufactured by Dai-Kogyo Seiyaku, 10% aqueous solution) 7 parts water-soluble melamine resin (Sumimar 150w1 manufactured by Sumitomo Chemical, 10% aqueous solution)
On top of 400 parts, the following composition F was coated using a bar coater method so that the dry film thickness was 10 μm.
It was dried in a drying oven at 0°C for 10 minutes.

Composition Agricultural and engineering thermoplastic elastomer resin (Chemipearl A-100, manufactured by Mitsui Petrochemical Industries, solid content 40%) 100 parts Polyurethane resin (Izerax 5-404ON manufactured by Hodogaya Chemical Industries, solid content 45%) 9 parts Polyoxyethylene ( Emulgen^-500, manufactured by Kao)
0.2 parts In this manner, a milky white recording material of the present invention having an overall light transmittance of 60% was obtained.

Comparative Example 1 A recording material having an overall light transmittance of 87% was prepared in the same manner as in Example 1, except that Composition B was coated by the bar coater method so that the dry film thickness was 5 μm. I got it.

Comparative Example 2 The overall light transmittance was 86% in the same manner as in Example 1 except that composition B in Example 1 was changed to composition G below.
A recording material of 100% was obtained.

1 productμ Polyvinyl alcohol (PVP-117 Riichi 7L/manufactured, 10% aqueous solution) 15
part colloidal silica (Snowtex OL, manufactured by Nissan Chemical Industries, Ltd.) loo part Example 4 and Comparative Example 3 The following four types of ink were used for each of the recording materials of the above Examples and Comparative Examples, and a heating resistor was used. Each inkjet recording was performed using a recording apparatus having an on-demand type inkjet recording head that generates bubbles and discharges ink using the pressure of the bubbles. The compositions of the four types of inks 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 evaluation results are shown in Table 1 below.

Goi no Yu (Composition) C, 1, Acid Yellow 23 2 parts diethylene glycol 15 parts water
85 parts Red L (composition) c, i, acid red 92 2 parts diethylene glycol 15 parts water
85 parts 5 Ink (composition) C, 1, Direct Blue 86 2 parts diethylene glycol 15 parts water
85 parts Taniko (composition) C, 1, Direct Black 19 2 parts diethylene glycol 15 parts water
85 parts (1) Ink absorption was measured by leaving the recorded matter at room temperature after inkjet recording and measuring the time it took for a sufficient amount of ink to dry and fix 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 on the image observation surface side (A
) and the recording surface (B).

(3) The color sharpness of an image largely depends on the contrast with the background, so visually check the one with the best quality.
Hereinafter, evaluation was made in four stages: O1Δ, x.

(4) The light transmittance of the recording material was measured using a direct reading haze meter manufactured by Toyo Seiki Seisakusho.

A comprehensive evaluation was made based on the above results. The results will be described in Part 1 below.
Shown in the table.

(Effects) With the recording material of the present invention configured as described above, it is not impossible to observe the recorded image from the side recorded with ink, like ordinary paper, but it is possible to observe the recorded image from the side recorded with ink. By observing both recorded images from the opposite side, that is, from the ink retaining layer or base material side, excellent effects not previously available can be obtained.

That is, since the ink retaining layer has translucency,
This could not be achieved when recording with ink on a porous sheet such as paper because there is less diffuse reflection on the image observation surface and the ink transport layer that forms the background is moderately light-diffusing. High image optical density can be obtained.7 In addition, the ink transport layer, which serves as the recording surface, is light-diffusing and liquid-permeable, and contains cracks and communicating pores, which improves ink absorption and the resolution of recorded images. This improves the image quality and provides clearer images.

Furthermore, when a translucent substrate is used as the substrate, in addition to the above-mentioned effects based on the substrate's optical transparency, the recorded image has gloss, water resistance, weather resistance, and abrasion resistance. Granted.

The recording material of the present invention is significantly superior in terms of the optical density of both recorded images and the operability when creating recorded images, compared to the conventional method of laminating a transparent film on the surface of the recorded image. be.

(Left below) Two photos! ;1 -1(A) 1.35 1.38
1.32(B) 0.65
0.63 0.67 Souji 1j1-1-00
0 ``O'' book L 1 Su (A) 1.10 1.08 (B
) 0.88 1.12 Fish shadow j bar old% x x Sosumi” 1-m-
× × Patent Applicant: Canon Co., Ltd. Procedural Official Report (Spontaneous) October q, 1986

Claims (12)

[Claims] (1) A recording material having an ink transport layer and an ink retention layer, wherein the ink transport layer is light-diffusing and the ink retention layer is light-transmitting. (2) The recording material according to claim (1), which has an overall light transmittance of 85% or less. (3) The recording material according to claim (1), wherein the ink transport layer and the ink retention layer are laminated on a base material. (4) The recording material according to claim (3), wherein the base material is translucent. (5) Claim No. 2, wherein the ink transport layer is porous (
The recording material described in item 1). (6) The ink transport layer is mainly composed of particles that do not stain the recording material and a binder.
) The recording material described in section 2.). (7) The recording material according to claim (1), wherein the ink retaining layer is non-porous. (8) The recording material according to claim (1), wherein the ink retaining layer is mainly composed of a water-soluble or hydrophilic polymer. (9) The recording material according to claim (1), wherein the ink retaining layer has a stronger ink absorption ability than the ink transport layer. (10) The recording material according to claim (1), wherein the ink transport layer has communication holes. (11) The recording material according to claim (1), wherein the ink transport layer includes cracks. (12) A recording method for recording with ink on the recording surface of a recording material having an ink transport layer and an ink retention layer, the ink transport layer of the recording material being light diffusive, and A recording method characterized in that the ink retaining layer is translucent.