JPS6141590A - Recording material - Google Patents

Abstract

PURPOSE:To form a light pervious recording material for ink jet recording excellent in sharpness and storage stability to a recorded image, in a recording material having an ink holding layer and an ink pervious layer, by further providing a dye fixing layer. CONSTITUTION:An ink holding layer is mainly formed of a hydrophilic material capable of receiving aqueous ink and obtained by applying a coating solution, which is prepared by dissolving or dispersing a polymer alone or a polymer mixture in a proper solvent, to a substrate and drying the formed coating layer. An ink pervious layer is the thin layer made of a natural or synthetic resin provided on the ink holding layer and it is necessary that said thin layer has hydrophilicity the same or inferior to that of the polymer constituting the ink holding layer. This recording material has a dye fixing layer other than the above mentioned two layers. That is, the dye fixing layer mentioned herein is one having a property for catching the dye contained in the received ink within the layer.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a recording material suitably used in an inkjet recording method, and in particular has excellent ink receptivity, sharpness of recorded images, stability of images over time, etc. , and when the recording material is a translucent recording material, it relates to a recording material that has excellent translucency as well as the above performance.

(Prior Art) 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 recording liquid using a piezoelectric element, and a method that applies mechanical vibration or displacement to the recording liquid using a piezoelectric element. In this method, small droplets of ink are generated and made to fly by foaming and using the pressure of the foam, and some or all of these droplets adhere to a recording material such as paper to perform recording, but this method generates noise. It is attracting attention as a recording method that allows for high-speed printing and multicolor printing.

Inks for inkjet recording are mainly water-based in terms of safety and recording properties.
Polyhydric alcohol or the like is often added to prevent nozzle clogging 1F and to improve discharge characteristics.

The recording material used in this inkjet recording method has conventionally been a recording material made of a base material called ordinary paper or inkjet recording paper provided with a porous ink absorbing layer. However, as the performance of inkjet recording improves and becomes more widespread, such as faster recording and multi-color printing, recording materials are increasingly required to have more sophisticated and wide-ranging properties. In other words, the recording medium for inkjet recording to obtain high-resolution, high-quality recorded images requires (1) the ink to be fixed on the recording material as quickly as possible, and (2) ink dots to overlap. (3) Even if the ink droplets deposited later do not flow into the dots deposited earlier, (3) Although the ink droplets will spread to some extent on the recording material,
(4) The shape of the ink dot should be close to a perfect circle and its circumference should be smooth. (5) The OD of the ink dot should be the same. It is necessary to satisfy basic requirements such as high optical density (optical density) and no blurring around the dots.

Furthermore, in order to obtain high-resolution recorded image quality comparable to color photography using multicolor inkjet recording, in addition to the above-mentioned performance requirements, (6) the coloring components of the ink must have excellent color development; (7) The ink fixation properties are particularly excellent since the same number of droplets as the number of ink colors may adhere to the same spot, (8) The surface must be glossy, (9) White Furthermore, in addition to the recording performance mentioned above, it is also important that the resulting high-resolution, high-quality images can be stored stably for a long period of time without changing over time. is necessary.

In addition, images recorded by inkjet recording 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. It is becoming demanded. The recording material is used for purposes other than surface image observation, such as projecting recorded images onto a screen or the like using a slide or an optical device such as an 0HP (overhead/ ) projector, and observing those images. Examples include color separation plates for creating positive plates for color printing, and CMFs (color mosaic filters) used in color displays such as liquid crystals.

When a recording material is used for surface image observation, the diffused light of the recorded image is mainly observed, whereas for recording materials used in these applications, the problem is mainly the transmitted light of the recorded image. Become. 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.

Furthermore, most conventional recording materials for surface image observation use a method in which a porous ink absorbing layer is provided on the surface, and a recording liquid is absorbed into the porous voids to fix the recording agent.

On the other hand, when the surface of the ink absorption 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. However, 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.

An object of the present invention is to provide a recording material for inkjet recording which is particularly excellent in ink receptivity and sharpness of recorded images, and also excellent in stability of recorded images over time.

Still 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 when creating a positive plate for color printing, or a liquid crystal display. An object of the present invention is to provide a translucent recording material for inkjet recording that can be used for observation of transmitted light such as CMF used in color displays.

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

(Disclosure of the Invention) That is, the present invention is a recording material having an ink retaining layer and an ink permeable layer, further comprising a dye fixing layer.

To explain the present invention in detail, the first feature of the recording material of the present invention is that an ink permeable layer with specific properties is provided on the ink retaining layer, and the above structure provides excellent ink receptivity. A second feature of the recording material of the present invention is that a dye fixing layer is provided in addition to the ink permeable layer and the ink retaining layer. Another objective of the present invention, stability of recorded images over time, could be achieved.

The recording material of the present invention generally comprises a base material as a support, an ink retaining layer provided on the surface thereof, an ink permeable layer provided on the ink retaining layer, and a dye fixing property in addition to these layers. For example, particularly preferred main embodiments include (1) an embodiment in which all of the base material, ink retaining layer, ink permeable layer, and dye fixing layer are translucent, and the recording material as a whole is translucent; (2) Examples include an embodiment in which at least one of the base material, ink retaining layer, ink permeable layer, and dye fixing layer is opaque, and the recording material as a whole is opaque.

In any of the above cases, the ink retaining layer may also have the function of a support.

The invention will be explained in more detail using the above two preferred embodiments as representative examples. 1. As the base material that can be used as a support in the present invention, any conventionally known base material such as transparent or opaque can be used. Examples of suitable transparent substrates include polyester resins, diacetate resins, triacetate resins, acrylic resins, polycarbonate resins, polyvinyl chloride resins, polyimide resins, cellophane, and celluloid. Examples include films or plates, and glass plates. Preferred opaque substrates include, for example, general paper, cloth, wood,
In addition to metal plates, synthetic papers, etc., the above-mentioned transparent substrates may be treated to make them opaque by known means. Preferably, such a substrate has a thickness of about 10 to 200 ILm.

In the present invention, the ink retaining layer provided on the base material is
It is mainly formed from a hydrophilic material that can accept water-based ink, and preferred examples of such materials include albumin, gelatin, casein, starch,
Cationic starch, gum arabic, natural resins such as sodium alginate, polyamide, polyacrylamide, polyvinylpyrrolidone, quaternized polyvinylpyrrolidone, polyethyleneimine, polyvinylpyricillium halide, melamine resin, polyurethane, carboxymethylcellulose, polyvinyl alcohol, cationically modified polyvinyl Examples include synthetic resins such as alcohol, polyester, and sodium polyacrylate, and one or more of these materials may be used as desired.

Furthermore, if necessary, to reinforce the strength of the ink retaining layer and/or improve the adhesion to the base material.

Resins such as SBR latex, NBR latex, polyvinyl formal, polymethyl methacrylate, polyvinyl butyral, polyacrylonitrile, polyvinyl chloride, polyvinyl acetate, phenol resin, and alkyd resin may be used in combination.

As a method for forming such an ink retaining layer, a coating solution is prepared by dissolving or dispersing the above-mentioned polymers alone or in a mixture in an appropriate solvent, and the coating solution is coated by, for example, a roll coating method, It is preferable to apply the coating onto the substrate by a known method such as a rod bar coating method, an air knife coating method, or a spray coating method, and then dry it immediately. Either a single ink retaining layer is formed by a known method such as a die method and used so that the ink retaining layer also has the function of a support, or
By a method of laminating the sheet on the base material, a method of hot melt coating the polymer material, etc.
An ink retaining layer may be formed on the base material.

The thickness of the ink retaining layer formed in this manner may be within a range capable of retaining ink, and may be as long as 0.14 m, although it depends on the amount of ink to be recorded.

Not particularly limited, practically 0.5 to 3
0 well is suitable.

The ink permeable layer used in the present invention and which primarily characterizes the present invention is a thin layer made of natural or synthetic resin provided on the ink retaining layer formed as described above. When a droplet of ink is deposited on the ink retaining layer, the droplet rapidly (e.g., within a few seconds) expands its contact area to the extent that it does not overlap excessively with other adjacent droplets, and It has the function of promoting penetration and reception of ink by the ink retaining layer.

The inventor of the present invention conducted extensive research in order to impart the above-mentioned functions to the ink retaining layer, and unexpectedly found that the ink retaining layer had a hydrophilicity of the same level or the same level as the polymer constituting the ink retaining layer. It has been discovered that the above functions can be easily achieved by forming a thin layer made of a polymer with inferior properties. It was truly surprising that such a function could be achieved even with thin films of polymers that, for example, have no or little solubility in water.

The ink-permeable layer having the above-mentioned functions is made of a polymer with hydrophilicity comparable to or relatively inferior to that of the polymer material forming the ink-retaining layer, and has a thickness of about 10 gm or less, preferably about 0.1 to 5 pm. This was achieved by forming a thin film of Polymeric materials useful in forming such thin layers include homopolymers or copolymers of vinyl acetate, acrylic esters, ethylene, vinyl chloride, and other vinyl monomers, as well as vinyl monomers such as those listed above and various hydrophilic vinyl monomers. In addition, polymers such as vinylon, polyurethane, cellulose derivatives, polyester, polyamide, etc., and the above-mentioned wood-philic polymers for forming an ink-retaining layer, singly or in combination, can be used to form an ink-retaining layer. It is preferable to select one with similar or inferior hydrophilicity.

Further, the selected polymer may be a solution in an organic solvent, but it is preferably used in the form of an emulsion in an aqueous medium, an organic solvent, or a fine dispersion in an aqueous medium.

When used as an organic solvent solution, it is preferable to use a relatively dilute solution or a concentration such that the formed layer falls within the above range.

The method for forming the ink permeable layer using the above materials may be the same as that for forming the ink retaining layer.

A second feature of the present invention is that the recording material of the present invention has a dye fixing layer in addition to the above two layers.

The dye fixing layer referred to herein is a layer that has the property of trapping the dye in the received ink within the layer.

The combination of materials constituting the ink permeable layer and ink retaining layer of the recording material of the present invention requires that the polymer forming the ink permeable layer has hydrophilicity comparable to or inferior to that of the polymer forming the ink retaining layer. Although there are no particular limitations other than the above, if neither of the above two layers has dye fixing properties, or if the dye fixing properties of the two layers are low, the following disadvantages occur.

In other words, if either of the above two layers has no or low dye fixing ability, the dye in the ink received by the ink retaining layer and the ink permeable layer will not be captured within the layer, so the time lag after printing will be delayed. Over time, the dye contained in the received ink diffuses within the layer, causing the areas around the dots of the recorded image to become blurred, the edges of the image to be unclear, or in areas where different inks are printed adjacent to each other. This causes problems such as mixing of both colors at the contact area, which reduces the resolution and clarity of the image.

In order to solve this problem, the recording material of the present invention is provided with a layer for capturing dye.

The specific factors that cause the dye in the ink to be captured by the above dye fixing layer include chemical capture such as ionic bonds and hydrogen bonds between polymers and additives and dye molecules, and dye adsorption by the porous inorganic pigment. Possible methods include physical trapping such as dye molecules being trapped between polymer molecular chains due to swelling of the polymer by ink, or a combination of these. I can't help it.

As a preferable material for forming the dye fixing layer, any resin that can form the ink permeable layer and the ink retaining layer can be used, and in order to strengthen the dye fixing property, porous inorganic particles can be used. may be dispersed in the dye fixing layer.

Examples of particles to be dispersed include silicic acid, aluminum silicate, calcium silicate, clay, talc, diatomite, calcium carbonate, calcium sulfate, barium sulfate,
Examples include titanium oxide, synthetic zeolite, alumina, zinc oxide, lithopone, satin white, magnesium carbonate, and the like.

The dye fixing layer of the recording material of the present invention is provided directly on the base material and an ink retaining layer and an ink permeable layer are provided on the surface thereof, or when it is provided on the ink retaining layer and an ink permeable layer is provided on the surface thereof. The material forming the dye fixing layer may be provided on the ink permeable layer, but the material forming the dye fixing layer may be the one provided in the first aspect of the present invention.
It is necessary to make a selection that does not impair the basic structure that characterizes the

In other words, when the dye fixing layer is provided directly on the base material L, the dye fixing layer has excellent ink retention properties, and when it is provided on the ink retention layer H, the dye fixing layer has excellent ink permeability or When provided on a layer, it is desirable to have excellent ink permeability.

Further, the method for forming the dye fixing layer of the present invention can be the same as the method for forming the ink retaining layer described above, and when dispersing inorganic particles in the layer, the required amount of inorganic particles can be added to the resin solution. can be formed in a similar manner by suspending and dispersing them. Further, by selecting the material for the dye fixing layer, it is also possible to provide the dye fixing layer with other functions. In other words, it is provided on the base material to improve the adhesion between the base material and the ink retaining layer, it is provided on the retaining layer to enhance the adhesion with the transmitting layer, or it is a protective layer for the ink retaining layer when forming the ink transmitting layer. Another advantage of the present invention is that it can also be used as a device.

Although the hydrophilicity of the ink-permeable layer of the recording material of the present invention having the above-mentioned basic structure is comparable to or inferior to the hydrophilicity of the ink-retaining layer, the recording material of the present invention has the following features:
It is surprising that the ink receptivity and ink fixing properties are significantly improved compared to conventional recording materials that do not have such an ink permeable layer. Although the theoretical basis for this is currently unknown, according to the inventor's mere imagination (the present invention is not limited by such mere imagination), the above-mentioned ink permeable layer is not necessarily continuous. There are countless microscopic gaps in the ink-permeable layer that allow water-based ink to penetrate into the ink-retaining layer, rather than a film, and the surface is irregular on a microscopic scale, resulting in small ink droplets adhering to the layer. It is considered that the ink absorption and fixing properties of the ink retaining layer are significantly promoted by rapidly diffusing on the surface and expanding their contact area. Further, in the recording material of the present invention, the ink permeable layer is formed from a polymer having hydrophilicity of the same level or lower than that of the ink retaining layer, and at least one of the ink retaining layer and the ink transmitting layer is made of a dye. Because it is fixative,
For example, even in a high-temperature, high-humidity atmosphere, the ink that has been received will not leak out onto the surface and contaminate equipment, operators, or the surroundings, and the surface will not become sticky under high-temperature, high-humidity conditions.

Furthermore, since it has a dye fixing layer in addition to the ink retaining layer and the ink permeable layer, high resolution and high quality images can be stored for a long time.

The above is the basic configuration of the present invention. However, in an embodiment in which the recording material of the present invention is translucent, a translucent material is used as the base material, and when forming the ink retaining layer and the ink transmitting layer, , it is necessary to ensure that these layers do not impair translucency. However, filling with silica, clay, talc, diatomite, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, synthetic zeolite, alumina, zinc oxide, lithopone, satin white, etc., to the extent that the translucency is not impaired. Agents can also be dispersed in the ink-retaining layer.

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

If the linear light transmittance is 2% or more, it is possible to project the recorded image onto a screen and observe it using OHP, for example, and in order to clearly observe the details of the recorded image, it is necessary to It is desirable that the light rate is 10% or more.

The linear transmittance T (%) here refers to the amount of light incident perpendicularly 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 c+a and is received by the detector is measured using, for example, a 323-type Hitachi self-recording spectrophotometer (newly manufactured by Hitachi). Then, from the measured spectral transmittance, the Y value of the tristimulus value of the color is determined, and the value is determined by the following formula.

T=Y/Y, Light rate (install an integrating sphere behind the sample to determine the light transmittance including diffused light), 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.

The problem with devices that use optical technology is the behavior of straight-line light, so when evaluating the light transmittance of the recording material to be used in those devices, it is important to check the straight-line transmittance of the recording material. It is particularly important to seek

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, it is necessary that the non-recorded areas of the projected image be bright, that is, the straight line transparency of the recording material. It is required that the light rate be at a certain level or higher. In an OHP test chart test, in order to obtain an image suitable for the above purpose, the linear transmittance of the recording material is 2% or more, and in order to obtain a clearer image, it is preferably 105 or more. More preferably, it is 50% or more. Therefore, a recording material suitable for this purpose needs to have an in-line transmittance of 2% or more.

In addition, in an embodiment in which the recording material of the present invention is opaque, at least one layer among the base material, ink retaining layer, and ink permeable layer may be made of an opaque material.

The method of forming each layer used in this embodiment is the same as in the transparency embodiment described above.

In this opaque embodiment, when forming the ink retaining layer and the ink permeable layer, it is possible to use a large amount of the filler to the extent that film forming properties are not impaired, thereby further improving excellent ink receptivity and fixing properties. can.

The present invention has been described above by exemplifying 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. In addition, in any embodiment, the ink retaining layer contains a dispersant, a fluorescent dye, and p.
Various known additives such as n 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.

As explained above and as demonstrated in the Examples below, the recording material of the present invention as described above has significantly improved ink reception and fixation, and for example, in the case of monochrome as well as full color. When recording, even if different colors of recording liquid adhere to the same spot repeatedly within a short period of time, there is no flow or seepage phenomenon of the recording liquid, and images with high resolution, clarity, and excellent color development can be obtained. Furthermore, even if recorded images are stored for a long period of time, the image quality will not deteriorate.
In addition, when using an optical device such as a slide or OHP to project a recorded image onto a screen or the like for observation, the adhered ink droplets are less
Since the area is enlarged and fixed to the extent that it does not overlap excessively with other adjacent areas, the transmitted light becomes even more uniform.
This provides a projected image with excellent uniform density. Furthermore, it can be suitably applied to uses other than conventional surface image observation, such as a color separation plate when creating a positive plate for color printing, or a CMF used in a color display such as a liquid crystal.

Hereinafter, the method of the present invention will be explained in more detail according to Examples. Note that parts in the text are based on weight.

Example 1 A polyethylene terephthalate film (manufactured by Toshi) with a thickness of 100 cm was used as a translucent base material, and coating solution A having the following composition was applied onto this film to a film thickness of 20 cm after drying. Coated by bar coater method so that
It was dried for 0 minutes to form an ink retaining layer. Next, the following coating solution B was applied onto the ink retaining layer until the dry film thickness was 31.
Lm, and dried at 60° C. for 15 minutes to form an ink-transmissive layer, thereby obtaining a translucent recording material of the present invention.

Coating liquid A composition; polyvinyl alcohol (Go-Shinanol KLO5, manufactured by Nippon Gosei Kagaku) 10 parts water
9
0 parts Coating liquid B composition: Carboxymethyl cellulose (Shichirogen 3H1 manufactured by Dai-Kogyo Seiyaku) 4 parts water
96 parts The thus obtained recording material of the present invention was colorless and transparent.

Example 2 A recording material of the present invention was obtained in the same manner as in Example 1 except that art paper was used as the base material. This recording material was white and opaque.

Example 3 A polyethylene terephthalate film (manufactured by Music University) with a thickness of 100 IL was used, and coating liquid A having the following composition was coated on this film using a bar coater method so that the film thickness after drying was 100 IL. Coating solution B was applied and dried at 80°C for 1 hour to form an ink retaining layer.
was coated on the ink retaining layer so that the dry film thickness was 5 p.m, and after being left in the apparatus for one day, an ink permeable layer was formed, and then an ink retaining layer and an ink permeable layer were combined from a polyethylene terephthalate film. The film was peeled off to obtain a translucent recording material of the present invention.

Coating liquid A composition: Polyvinylpyrrolidone (manufactured by K-60GAF) 15 parts water
85 parts Coating liquid B Composition: Hexamethylene diisocyanate urethane (Coronate HL, manufactured by Nippon Polyurethane) 5 parts Ethyl acetate 95 parts Example 4 This was prepared in the same manner as in Example 3 except that art paper was used as the base material. A recording material of the invention was obtained.

Example 5 A polyethylene terephthalate film (manufactured by Toshi) with a thickness of 1007 parts m was used as a translucent base material, and coating solution A having the following composition was applied onto this film so that the film thickness after drying was 20 g.
It was coated by a bar coater method so that the thickness of the ink retaining layer was 3.
JLm and dried at 60° C. for 15 minutes to form an ink-transmissive layer □ to obtain a translucent recording material of the present invention.

Coating liquid A composition: Water-soluble acrylic resin (Korgum HW-7, Showa Kobunshi) 10 parts water
90 parts Coating liquid B composition: Polyvinyl acetate (Movinyl 303, manufactured by Hoechst) 5 parts water
95 copies Comparative Examples 1 and 2 Comparative recording materials were prepared in the same manner as in Examples 1 and 2, except that no ink permeable layer was formed.

Comparative Example 3 A comparative recording material was prepared in the same manner as in Example 1, except that X Coat P-130 (manufactured by Seiko Kagaku) was used as coating liquid A.

Comparative Example 4 A comparative recording material was prepared in the same manner as in Example 3, except that the following composition was used as coating liquid A.

Coating liquid A composition: Carboxymethyl cellulose (Celogen B, S, manufactured by Dai-Kogyo Seiyaku) 6 parts polyvinylpyrrolidone -90, manufactured by GAF) 2 parts water
92
Section: An on-demand inkjet recording head (on-demand type inkjet recording head that ejects ink using a piezo vibrator using the following four types of ink on the recording materials of the above examples and comparative examples)
Discharge orifice diameter 65pL, piezo vibrator drive voltage 7
Recordings were performed at 0V and frequency 3.

Yellow ink (composition) C, 1, Direct Yellow 86 2 parts N-methyl-
2-pyrrolidone 10 parts diethylene glycol
20 parts polyethylene glycol $200 15 parts water 55
Part magenta ink (composition) C, 1, acid red 35 2 parts N-methyl-2-pyrrolidone 10 parts diethylene glycol
20 parts polyethylene glycol #200 15 parts water 55
Part cyan ink (composition) c, r, Direct Blue 86 2 parts N-methyl-
2-pyrrolidone 10 parts diethylene glycol
20 parts Polyethylene glycol #200 15 parts Water 55 parts Black ink (composition) C, 1, Food Black 2 2 parts N-methyl-2-pyrrolidone 10 parts Diethylene glycol
20 parts polyethylene glycol #200 ts
s water 5
Part 5 - Evaluation results of the recording materials of the above examples and comparative examples are shown in Table 1. Each evaluation item in Table 1 was measured according to the following method.

(1) The ink fixation time was 1. After recording, the recording material was left at room temperature, and when the recorded image was touched with a finger, the time required for the ink to dry and stop adhering to the finger was measured.

(2) The dot density was calculated using Sakura Microdensidometer PD by applying JISK7505 to the printed microdots.
The black dots were measured using M-5 (manufactured by Konishiroku Photo Industry).

(3) O) IP suitability was measured as a representative example of optical equipment, and was determined by projecting the recorded image onto a screen using 0) IF and visually observing it. The OD (optical density) is high and a clear and easy-to-see projected image with high contrast is obtained. Δ indicates that the 25 mm line cannot be clearly distinguished, the non-recorded area is quite dark, the OD of the recorded image is quite low, the pitch width is 1 mm, and the thickness is 0.
3. Cases in which the lines of the 3-dimensional line could not be clearly distinguished, or cases in which the non-recorded area and the recorded image could not be distinguished were marked as ×.

(4) 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, and measuring the spectral transmittance as described above (
1) It was calculated using the formula.

(5) Stability over time: When the image was stored under an environmental condition of 35°C and 80% RH after printing and observed after 200 hours, the edges of the recorded image were unclear due to migration of the received dye. In the case where the printed parts of two different colors of ink are in contact with each other and the colors are mixed, it is marked as "×", and when the above phenomenon is not observed, it is marked as "0".

(Left below) Example 2 20°C 65 stations H 30 seconds 30 seconds 2 minutes 2 minutes
1.5 minutes 20℃ 85 translation H1.5 minutes 1.5 minutes 3
Minutes 3 minutes 10 seconds Blood color line - 1 Koichi rate 78
% -76% -75% lower knee upper level 1.0 1.1 0.9 1.
2 0.139 once-! -Suitability 0-0
0 Temporary stability constant consistency o
ooooo.

20℃ 85 stations H2 minutes 30 minutes or more 30 seconds 3
0 seconds solid 9ki 30 minutes 1.5 minutes 1.5
Minutes 20℃ 85XRH unrecordable

Claims (1)

[Claims] A recording material comprising an ink retaining layer and an ink permeable layer, further comprising a dye fixing layer.