JPS62271783A - Material to be recorded and recording method using the same - Google Patents

Abstract

PURPOSE:To provide a material to be recorded which has an ink transportation layer and an ink holding layer, and the material producing a recording image with a proper surface gloss, high optical density, light-fastness, rich coloring property, high water- proofness, abrasion resistance, resolution, preservability and visibility, by specifying the haze value and whiteness of the material to be recorded. CONSTITUTION:A material to be recorded consists of an ink transportation layer and an ink holding layer, and has 60-99% of haze value and 60-100% of whiteness. The ink transportation layer has a liquid permeability, so that it is capable of quickly absorbing and passing ink without being substantially dyed by the ink which has adhered thereto. On the other hand, the ink holding layer is capable of absorbing and holding ink or dye which has transferred from the ink transportation layer. The material to be recorded presents a viewing surface mainly on the ink holding layer or transparent substrate sides. However, a formed image is not limited to be viewed in a reflected light but also it is viewed with a light source such as fluorescent lamp provided behind the image as in the case of various advertising displays, in dark environment where the external light is not enough as in night or in a subway.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention provides a recording material suitable for a recording method using ink, such as a felt ben, a fountain pen, a pen plotter, an inkjet recording device, etc. The present invention relates to a recording material having excellent ink absorption properties, color properties of recorded images, light fastness, storage stability, etc., and a recording method for obtaining such high-quality recorded images.

(Conventional technique!?) Conventional recording methods using ink 1 For example, writing with a fountain pen, felt-tip 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, pound 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,
It is possible to increase ink absorption to some extent, but because the absorption layer is porous, the recording material develops light diffusing properties, resulting in clear recorded images with high optical density and glossy recorded images. is not obtained.

In addition, since the recorded image is observed from the ink-applied surface, the recording agent (dye or pigment, hereinafter simply referred to as dye) is configured to remain as much as possible on the surface of the absorbing layer, which improves the water resistance and abrasion resistance of the image. The disadvantage is that it has poor durability and storage stability.

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, which is mainly composed of pigments, is directly adjacent to the support, the ink and dye are only retained within the pores of the ink-receiving layer, and water droplets do not form on the recording medium after recording. The disadvantage is that the ink and dye are eluted by adhesion or immersion in water, resulting in extremely poor water resistance.

In recent years, as the speed and quality of recording using inkjet recording devices, pen plotters, etc. has increased, images comparable to color photographs have been obtained, and attempts have been made to use them for display purposes. There is. Depending on these display methods, there are two known display methods: one in which the reflected light of the image is observed, and the other in which the transmitted light is observed.

However, conventionally, when an image is observed using a reflection method or a transmission method, it is extremely difficult to obtain a clear image with desirable colors. In order to solve this problem, an inkjet recording sheet having a layer structure of two or more layers and having an opacity of 55.0 to 97.5% has been proposed in Japanese Patent Application Laid-Open No. 55-11829.

This inkjet recording sheet made it possible to reduce to some extent the difference in visual color density between an image produced by reflected light and an image produced by transmitted light. Because the absorbing layers are laminated, the applied ink is absorbed and retained by the porous ink absorbing layer (further inside the pigment) or by the paper (porous) support, resulting in a high concentration. A glossy recorded image cannot be obtained.

In other words, it is a recording material that is significantly superior to conventional recording materials in all aspects of recording performance, such as ink absorption, dye coloring, light fastness of recorded images, resolution, color, recorded image density, storage stability, and gloss. Materials are now needed.

As a result of research to provide a recording material as described above, the present inventor has discovered a recording material with a specific configuration, which has an ink transport layer and an ink retention layer, and in which the ink application surface and the image observation surface are in a front and back relationship. was proposed earlier.

However, in the recording materials of these prior inventions,
The correlation between various required performances, such as the ink absorbency of the formed ink transport layer, its strength, its relationship with the ink retaining layer, and its relationship with the quality of the formed image, is not clear, and it is difficult to improve certain types of performance. Problems such as a decline in other performance arose. For example, if the thickness of the ink transport layer is increased to improve ink absorption, the image density will decrease, if it is thinned, the resolution will decrease, and if too many resin particles are added, the ink transport layer will crack. In addition, if there were too few resin particles, the ink absorbency would be insufficient, and the color and resolution would be insufficient, among other problems.

Therefore, the above-mentioned recording material exhibits excellent ink absorbency, blocking resistance, etc. during recording, and after recording, it exhibits restored color, high image density, resolution, water resistance, 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 its 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, congratulations, and the like.

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

(Means for Solving the Problems) That is, the present invention provides a recording material having an ink transport layer and an ink retention layer, the recording material having a haze value of 60 to 99%. Yes, and whiteness is 60 to 100%
This is a recording material characterized by the following.

Furthermore, a second aspect of the present invention is a recording method for recording with ink on a recording material having an ink transport layer and an ink retention layer, the recording material having a haze value of 60 to 99%. In addition, this recording method is characterized in that the degree of whiteness is 60 to 100%.

(Function) The main characteristics of the recording material of the present invention are that the recording material has a haze value of 60 to 99% and a whiteness of 60 to 100%.

That is, the recording material of the present invention basically has an ink transport layer on the ink side and an ink retention layer adjacent thereto.

The ink transport layer, which is the first characteristic of the present invention, has liquid permeability and has the function of rapidly absorbing and permeating the adhered ink without being substantially dyed, while the ink retaining layer is It has the function of absorbing and retaining ink or dye transferred from the ink transport layer.

At this time, the ink transport layer has a high affinity for the liquid medium in the ink, but has a low affinity for the dye.

Therefore, the ink transport layer has properties such as wetting, penetration, and diffusion for the liquid medium in the ink, and has properties such as wetting, penetration, and diffusion for the liquid medium in the ink.
It must be constructed by selecting a material that does not have properties such as adsorption, penetration, or reaction.

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 a high affinity for the dye as well as for the liquid medium in the ink.

The third feature of the present invention is that the recording material configured as described above has a haze value of 60 to 99% and a whiteness of 6.
This is a point from 0 to 100%.

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 viewing surface.
The image formed is not limited to the case where all images are observed using reflected light. For example, a light source such as a fluorescent lamp is attached to the back of various advertising displays, etc., and for example, the image is observed in a dark place with little outside light such as at night or on a subway. It is also often used in the environment. In this type of usage, there are two types of images: an image observed during the day (in bright light) (i.e., a reflected light image), and an image observed at night or in the dark using a backlight source (i.e., a transmitted image).
It is desired that the two exhibit similar color properties.

The image obtained by the recording material of the present invention fully satisfies the above requirements by having the above structure, and there is no color shift between the image due to reflected light and the image due to transmitted light, and both are equally i! ! It has the characteristic that it can be detected. On the other hand, when the haze value and whiteness are less than or exceed the above ranges, the reflected light image and the transmitted light image show markedly different color properties, and the congratulations are different in the daytime (bright place) and at night (dark place), which is preferable. do not have.

Incidentally, in the present invention, the haze value is a value expressed by the following formula.

Haze value ()I) = T1 /T2 X100 (%)T
I = Diffuse transmitted light rate T2: Total transmitted light rate Specifically, it shows the ratio of diffused light to the transmitted light, and it shows the degree of haziness of the image when viewed through the sample. .

Furthermore, the whiteness referred to in the present invention is measured according to the method of JISP 8123.

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 retaining layer formed on the base material that substantially absorbs and captures ink or dye; and a translucent ink retaining layer formed on the ink retaining layer that directly receives ink, has liquid permeability, It is composed of a light-diffusing ink transport layer that leaves no residual dye.

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. , polyvinyl chloride resin, polyvinyldene chloride resin, polysulfone resin, polyimide resin, and other plastic films, plates, and glass plates. The thickness of these base materials may be any thickness, but is generally about 1 μm to s, ooo μm.

As mentioned above, since the image obtained by the recording material of the present invention is mainly formed in the ink retaining layer, when the ink transport layer is non-transparent, the base material is transparent. As such, images can be observed from the substrate side.

Moreover, any processing may be applied to the base material used. For example, it is possible to give the base material a desired pattern, an appropriate gloss, or a textured pattern. 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 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 substantially cause the dye in the ink to remain in the ink transport layer. A preferred embodiment for improving the liquid permeability of the ink transport layer is to form a porous structure having cracks and communicating holes inside the ink transport layer.

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

Such particles may be any particles that do not substantially adsorb dyes, etc. in ink, and particularly suitable particles in the present invention are particles because dyes in ink are generally water-soluble. Organic particles such as highly hydrophobic thermoplastic resins and thermosetting resins, such as polystyrene, polymethacrylate, elastomers, ethylene-vinyl acetate polymers, styrene-acrylic copolymers, polyesters,
At least one resin powder such as polyacrylic, polyvinyl ether, polyamide, polyolefin, guanamine resin, SBR, polytetrafluoroethylene, chloroprene, or an emulsion or suspension thereof may be used as desired.

By using the above particles, the ink transport layer generally becomes milky white, and the haze value and whiteness of the recording material can be changed freely depending on the amount used, but the ink transport layer becomes a background for image observation. In order to increase the whiteness of the ink transport layer, white inorganic pigments such as talc, calcium carbonate,
Calcium fflate, magnesium hydroxide, basic magnesium carbonate, alumina, synthetic silica, calcium silicate, diatomaceous earth, aluminum hydroxide, clay, barium sulfate, titanium oxide, zinc oxide, zinc sulfide, satin white, silicon oxide, lithopone etc., light diffusing agents, fluorescent dyes, etc.
Coloring dyes and the like may also 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-stainable to dyes 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, melamine resin, epoxy resin, styrene-butadiene rubber, urea resin, phenol
One or more of resins such as olefin resin, α-olefin resin, 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 should be determined in order to obtain preferable ink transport properties, light diffusivity, and haze value.
The particle/binder ratio is preferably in the range of 1/3 to 50/1,
More preferably, it is in the range of 315 to 20/l. 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 retention layer that substantially captures the ink or dye is transparent and absorbs, captures, and substantially permanently retains the dye in the ink that has passed through the ink transport layer. It is something.

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.

Further, as described above, when observing a recorded image from the side opposite to the ink application surface, the ink retaining layer needs to be translucent.

The ink retaining layer that satisfies the above requirements is preferably composed of a light-transparent resin that adsorbs dye and/or a light-transparent resin that is soluble and swellable for the ink.

For example, when a water-based ink containing an acid dye or a direct dye is used as the dye, the ink-retaining layer may be made of a resin that has adsorption properties for the dye, such as a water-soluble resin or a resin that has swelling properties for the water-based ink. Preferably, it is made of a hydrophilic 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 only needs to be sufficient to absorb and trap the ink. l! It is preferably 1 to 50 μm, more preferably 3 to 20 μm, although it varies depending on 1ffi.

The material constituting the ink retaining layer may be any material as long as it can absorb water-based ink and retain the dye in the ink, but since the ink is mainly water-based, water-soluble or hydrophilic polymers may be used. Preferably, it is formed from. 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, Polyvinylpyrrolidone, quaternized polyvinylpyrrolidone, polyvinylpyricillium halide, melamine resin, phenolic resin, alkyd resin,
Synthetic resins such as polyurethane, polyvinyl alcohol, ion-modified polyvinyl alcohol, polyester, and sodium polyacrylate, preferably hydrophilic polymers made by crosslinking these polymers to make them water-insoluble, hydrophilic and water-insoluble polymers of 2M1 or more Polymer complexes, hydrophilic and water-insoluble polymers having hydrophilic segments, and the like.

As a method for forming an ink retaining layer and an ink transport layer on a substrate, a coating solution is prepared by dissolving or dispersing the materials preferably listed above in an appropriate solvent, and a coating solution is prepared by, for example, It is preferable to apply the coating onto the base material by a known method such as roll coating method, rot bar coating method, spray coating method, air knife coating method, etc., and then dry it at a rate-limiting rate. Alternatively, a method may be used in which a single sheet is first formed from the above-mentioned materials 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 observation surface of the recorded image will be subject to diffuse reflection, which will substantially lower the optical density of the image, which is undesirable.

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 devices that use ink containing dyes.

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 partial-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 dye T4 to be included in the ink, conventionally known coloring agents such as dyes and pigments and/or materials having color-developing properties can be used. For example, dyes used in inkjet recording include direct dyes, basic dyes, reactive dyes,
Water-soluble dyes such as food colorings are preferred.

In the recording method of the present invention, when the ink-applied surface and the observation surface are in a front-back relationship, when printing characters, it is necessary to use a device that can print mirror characters, unlike conventional printing methods. However, in the recording material of the present invention, the ink transport layer can be made transparent by heating after recording, so that the image can be observed in a transmission manner. Therefore, in such a case, characters etc. may be recorded in a normal state.

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

Example 1 A polyethylene terephthalate film (thickness lOOμm% Q-800, manufactured by Toshi) was used as a translucent base material, and the following composition A was coated on this base material using a bar coater so that the dry film thickness was 8 μm. and dried in a drying oven at 140°C for 8 minutes.

Cosmetic composition A: Cation-modified polyvinyl alcohol (PV 8- (Nie 318-2A, manufactured by Kuraray) 10% DM
F solution 100 parts Water-soluble melamine resin (Sumimar M-100, manufactured by Sumitomo Chemical Industries) 1
0% aqueous solution 4 parts Styrene-acrylic acid copolymer (Oxilac 5fl-2100 Nippon Shokubai type) 10
% aqueous solution was further coated thereon with a bar coater to give a dry film thickness of 30 μm, and dried in a drying oven at 90° C. for 7 minutes.

1 Low-density polyethylene resin (Chemivar 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, Deci 1) 0.2 parts The present invention thus obtained The haze value of the recording material was 93.4%, the whiteness was 74.0%, and it was white as a whole.

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 film was coated using the following method and dried in a drying oven at 110°C for 10 minutes.

Polyvinylpyrrolidone (PVP-90, manufactured by GAF)
O% DMF solution 84 parts Styrene/acrylic acid copolymer (Oxilac 5H-210
0, Nippon Shokubai type) 10% DMF solution
On top of the 166 parts, the following composition was coated using a bar coater so that the dry film thickness was 30 μm.
It was dried in a drying oven at 30°C for 4 minutes.

100 parts of Yudan polymethacrylate resin (Microsphere M, manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd.) Ionomer resin (Chemivar 5A-100, manufactured by Mitsui Petrochemical Industries, Ltd., solid content: 35
%) 30 parts Sodium dioctyl sulfosuccinate (Perex 0T-P, manufactured by Deci, solid content 70%) 0.
15 parts water 40
The thus obtained recording material of the present invention had a haze value of 94.8%, a whiteness of 78.0%, and was white as a whole.

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

Cation-modified polyvinyl alcohol (Pv8-C-31)
8-2A, manufactured by Kuraray, 10% water soluble @) 100 parts isocyanate compound (Elastron C-9, manufactured by Dai-Kogyo Seiyaku, 10% aqueous solution) 7 parts water-soluble melamine resin (Sumimart 50W, manufactured by Sumitomo Chemical, 10% aqueous solution)
Further, 40 parts of the following composition F was applied thereon using a bar coater so that the dry film thickness was 20 μm.
It was dried in a drying oven at 30°C for 7 minutes.

Cross-linked polystyrene resin (Nipol 30005P manufactured by Sumitomo Chemical) 100 parts Styrene-butadiene copolymer resin (Nipol LX432^, Nippon Zeon Group, solid content 41%) 25 parts Polyoxyethylene (
Emulgen A-500, manufactured by Deci)
0.5 part water
100 copies The thus obtained recording material of the present invention had a haze value of 94.2%, a whiteness of 80.2%, and was white as a whole.

Comparative Example 1 A haze value of 54% and a whiteness of 72 were obtained in the same manner as in Example 1 except that Composition B was applied using a bar coater so that the dry film thickness was 5 μm.
．． A comparative recording material having a concentration of 0% was obtained.

Comparative Example 2 In Example 1, Composition A was not applied and Composition B was changed to Composition G below, and the haze value was 62 in the same manner as in Example 1.
%, and a comparative recording material with a whiteness of 76.1% was obtained.

Koui Muttama polyvinyl alcohol (PVP-117 manufactured by Kuraray, 10% aqueous solution) 15 parts Colloidal silica (Snowtex OL, Nissan Chemical Industries 5
J) too part Example 4 and Comparative Example 3 Using the following four types of ink on each of the recording materials of the above Examples and Comparative Examples, bubbles were generated with a heating resistor, and the pressure was applied to the recording materials. Each inkjet recording was performed using a recording apparatus having an on-demand type inkjet recording head that ejects ink. 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.

Matatsuli (composition) C, T, Acid Yellow 23 2 parts diethylene glycol 15 parts water
85 parts Red Evening (composition) C, 1, Acid Red 92 2 parts diethylene glycol 15 parts water
85 parts Higeen no l (composition) C, 1, Direct Blue 86 2 parts diethylene glycol 15 parts water
85 parts Ink (composition) C, 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 black ink recording area, viewing side (A)
was measured from the recording surface side (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: O1△, ×.

(4) The haze value of the recording material was measured as the haze value ratio of the entire recording material using a direct reading haze meter manufactured by Toyo Seiki Seisakusho.

(5) The whiteness of the recording material was measured using a new digital hunter reflectance meter manufactured by Toyo Seiki.

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 the recorded image from the opposite side, that is, from the ink retaining layer or the base material side, a blurring effect that could not be obtained in the past can be obtained.

That is, since the ink retaining layer has translucency, 1
Diffuse reflection on the image observation surface is reduced, and the ink transport layer, which forms the background, has an appropriate degree of whiteness, so it is possible to achieve a high level of whiteness that could not be achieved when recording with ink on a porous sheet such as paper. Image optical density is obtained.

In addition, as a result of the recording material having an appropriate degree of whiteness and an appropriate haze value, there is almost no difference between a reflected light image in the daytime and a transmitted light image by a back light source at night or in a dark place.
He is very familiar with the creation of images for various displays, which is done day and night.

Furthermore, when a translucent substrate is used as the substrate, in addition to the above-mentioned effects based on the translucency of the substrate, 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 recorded images and the operability when creating recorded images, compared to the conventional method of laminating a transparent film on the surface of recorded images. .

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Claims (11)

[Claims] (1) A recording material having an ink transport layer and an ink retention layer, characterized in that the recording material has a haze value of 60 to 99% and a whiteness of 60 to 100%. Recording material. (2) The recording material according to claim (1), wherein the ink transport layer and the ink retention layer are laminated on a base material. (3) The recording material according to claim (2), wherein the base material is translucent. (4) Claim No. 2, wherein the ink transport layer is porous (
The recording material described in item 1). (5) Claim No. 1, wherein the ink transport layer is mainly composed of particles that are non-stainable to dyes and a binder.
Recording material described in section. (6) The recording material according to claim (1), wherein the ink retaining layer is non-porous. (7) The recording material according to claim (1), wherein the ink retaining layer is mainly composed of a water-soluble or hydrophilic polymer. (8) The recording material according to claim (1), wherein the ink retaining layer has a stronger ink absorption ability than the ink transport layer. (9) The recording material according to claim (1), wherein the ink transport layer has communication holes. (10) The recording material according to claim (1), wherein the ink transport layer includes cracks. (11) A recording method in which recording is performed using ink on a recording material having an ink transport layer and an ink retention layer, the recording material having a haze value of 60 to 99% and a whiteness of 60%. A recording method characterized in that the recording rate is between 100% and 100%.