JPS6135986A - Material to be recorded - Google Patents

Abstract

PURPOSE:To obtain a material to be recorded for ink jet recording excellent in ink receptivity and imparting a sharp image, by providing an ink pervious layer comprising a fine particle layer on the ink holding layer on a substrate and further applying a powder thereto. CONSTITUTION:An ink holding layer comprising a hydrophilic material copable of absorbing aqueous ink is provided on a substrate with a thickness of about 10-200mum such as paper, cloth, a metal plate or a resin film. As the hydrophilic material, albumin, starch or polyamide are used and, if necessary, latex is used together. The thickness of the ink protective layer is pref. about 0.5-30mum. A thin layer comprising fine particles made of a polymer of which the hydrophilicity is equal or inferior to the ink layer, for example, a vinyl polymer or synthetic rubber is formed to the ink layer in a thickness of about 10mum or less. A fine powder with a particle size of 20mum or like such as a silica or clay is applied to the ink pervious layer in a ratio of about 0.01-1.0g/m<2>.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a recording material suitably used in an inkjet recording method, and in particular, to improve ink receptivity, clarity of recorded images,
The present invention relates to a recording material that has excellent conveyance properties in a printer, anti-blocking properties, etc., and when the recording material is a translucent recording material, it also has excellent translucency in addition to the above-mentioned 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, and some or all of them adhere to a recording material such as paper to perform recording. It is attracting attention as a recording method that causes fewer occurrences and allows for high-speed printing and multicolor printing.

Inks for inkjet recording are mainly water-based in terms of safety and recording properties.
Polyhydric alcohols and the like are often added to prevent nozzle clogging and improve ejection characteristics.

The recording material used in this inkjet recording method is 2
Conventionally, recording materials have been used that are formed by providing a porous ink absorbing layer on a base material called ordinary paper or inkjet recording paper. However, as the performance of inkjet recording apparatuses improves and becomes more widespread, such as faster recording speeds and multicolor recording, more advanced and wide-ranging properties are being required of recording materials. In other words, in order to obtain high-resolution, high-quality recorded images, the recording material for inkjet recording must (1) be able to fix the ink to the recording material as quickly as possible, and (2) have overlapping ink dots. (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 (optical density) of the ink dot should be ) is high and the area around the dots is not blurred, etc., and other basic requirements must be met.

Furthermore, in order to obtain high-resolution recorded image quality comparable to color photography using multicolor inkjet recording, in addition to the above-mentioned required performance, (6) the coloring components of the ink must have excellent color development; 7) The ink fixation properties are particularly excellent, as the same number of droplets as the number of ink colors may adhere to the same spot, (8) The surface must be glossy, (9) Whiteness (10) Smooth conveyance when applied to a printer.

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. As for the use of the recording material other than the 0 surface image observation that is becoming increasingly required, the recorded image is projected onto a screen etc. using an optical device such as a slide or 0HP (overhead projector), and one image of the recorded image is observed. Examples include those used for color printing, color separation plates for creating positive plates for color printing, and CMFs (color mosaic filters) used for 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 that is particularly excellent in ink receptivity, sharpness of recorded images, transportability within a printer, blocking resistance, etc.

A further object of the present invention is to use an optical device such as a slide or an OHP to project a recorded image onto a screen for observation, a color separation plate for creating a positive plate for 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 transmitted light observation such as CMF used in color displays.

Furthermore, the commonly required qualities of the recording material are that it should be able to feed the recording material smoothly without clogging when handled and put through the printer, that is, it should have good transportability; During storage, it is necessary to improve the product value by not causing blocking due to adhesion by coating agents, and by not allowing fingerprints to adhere when touched by the human hand.The present invention also provides such necessary performance. The present invention also provides a recording material for inkjet recording, which is equipped with the following.

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

(Disclosure of the Invention) That is, the present invention has an ink retaining layer and an ink permeable layer, the ink permeable layer is a layer of fine particles, and powder is provided on the ink permeable layer. This is a recording material characterized by:

To explain the present invention in detail, the recording material of the present invention is provided with an ink permeable layer consisting of a fine particle layer on the ink retaining layer, and powder is applied to the ink permeable layer. The object of the present invention has been mainly achieved thereby.

The recording material of the present invention generally includes a base material as a support, an ink retaining layer provided on the surface thereof, an ink permeable layer which is a fine particle layer provided on the ink retaining layer, and an ink permeable layer provided on the ink retaining layer. For example, as a particularly preferred main aspect, (1) all of the base material, ink retaining layer, ink permeable layer, and powder layer are translucent, and the recording material as a whole is translucent; A mode of being sexual.

(2) Examples include an embodiment in which at least one of the base material, ink retaining layer, ink permeable layer, and powder 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.

To explain the invention in more detail using the above two preferred embodiments as representative examples, 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 substrates have a thickness on the order 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, in order to reinforce the strength of the ink retaining layer and/or improve the adhesion with the base material, SBR latex, NBR latex, polyvinyl formal, polymethyl methacrylate, polyvinyl butyral, polyacrylonitrile, polyvinyl chloride may be added as necessary. , polyvinyl acetate, phenol resin, alfkyd resin, etc. 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 one method, such as a roll coating method, It is preferable to apply the coating onto the substrate by a known method such as the Rottbar coat ink method, the air knife coating method, or the spray coating method, and then dry it immediately. Either a single ink retaining layer is formed by a known method such as the T-die method, and the ink retaining layer is used to have the function of a support.
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 thus formed may be within a range capable of retaining ink, and is not particularly limited as long as it is 0.1 JLm or more, although it depends on the amount of ink to be recorded. Practically speaking, a range of 0.5 to 30 ILm is suitable.

The ink permeable layer used in the present invention and which is the first characteristic of the present invention is a thin layer made of fine particles of natural or synthetic resin provided on the ink retaining layer formed as described above. When a small drop of ink adheres to the surface,
The droplet quickly expands the contact area (for example, within a few seconds) to the extent that the droplets do not overlap excessively with other droplets adjacent to each other, and promotes penetration into the ink-retaining layer and reception of the ink by the ink-retaining layer. It has the function of

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. The inventors have discovered that the above functions can be easily achieved by forming a thin layer of fine particles of a polymer with inferior properties. It was truly surprising that such a function could also be achieved with a thin layer of fine particles of a polymer which, for example, has no or little solubility in water.

The ink permeable layer having the above-mentioned functions is made of fine particles of a polymer having a hydrophilicity comparable to or relatively inferior to that of the polymer material forming the ink retaining layer.
This was achieved by forming a thin layer with a thickness of less than 0.01 Lm, preferably in the range of about 0.1-5 ILm. Polymeric materials useful in forming such thin layers include homopolymers or copolymers of vinyl acetate, acrylic esters, ethylene, vinyl chloride, and other vinyl monomers; Polymers consisting of monomers such as vinylon, polyurethane, cellulose derivatives, polyesters, polyamides, alkyd resins, synthetic rubbers represented by styrene-butylene rubber, and the above-mentioned hydrophilic polymers for forming an ink retaining layer alone, or It is preferable to select a hydrophilic material from the mixture that has a hydrophilicity comparable to or inferior to that of the ink-retaining layer.

The selected polymers are also preferably used in the form of an emulsion in an organic solvent or an aqueous medium, or as a fine dispersion in an organic solvent or an aqueous medium. In any case, these polymers are preferably used as relatively dilute emulsions or dispersions at a concentration such that the layer formed is within the above range.

The method of forming a permeable layer consisting of fine particles using the above-mentioned materials is to apply the above-mentioned resin liquid to a certain thickness on the ink-retaining layer, and then dry the polymer by paying attention to the drying temperature. It can be easily prepared by removing the medium by drying at a temperature at which the fine particles do not fuse or do not fuse excessively to each other.

The thickness of the ink permeable layer formed in this way and made of fine polymer particles is not particularly limited as long as it is 10 #Lm or less, although it depends on the amount of ink required for recording. is preferably in the range of 1 to 5 ILm.

Additionally, the permeable layer may be formed using a material that causes the permeable membrane to swell or dissolve and collapse the fine particle structure after the aqueous ink permeates.
In general, it can be used even under harsh conditions such as high temperature and high humidity, and it forms a layer that is difficult to swell and dissolve with water-based ink so that the ink retaining layer can be protected under such conditions. It is preferable to select a transparent layer-forming material that is capable of forming a transparent layer.

The fine particles constituting the permeable layer produced as described above may have a particle size in the range of a typical polymer emulsion or dispersion, for example, about 0.
Preferably, the particles have a size in the range of . By using such particles, numerous gaps are formed between the particles through which the aqueous ink can sufficiently permeate through capillary action, and the remarkable effects of the present invention are achieved.

Although the ink-permeable layer of the recording material having the above-mentioned basic structure has the same or inferior wood-philicity to that of the ink-retaining layer, this recording material does not support such ink. It is surprising that ink receptivity and ink fixing properties are significantly improved compared to conventional recording materials without a transparent layer.

This surprising effect is due to the fact that the ink-permeable layer is porous because there are countless microscopic gaps in the ink-retaining layer that allow water-based ink to penetrate into the ink-retaining layer. As a result, the adhered ink droplets quickly spread on its surface, expanding their contact area, and the capillary action of countless micropores increases the ink absorption and The fixing properties are significantly improved.

In addition, in the above-mentioned recording material, the ink permeable layer can be formed from a polymer with hydrophilicity of the same level or lower than that of the ink retaining layer, so even in a high temperature and high humidity atmosphere, for example, once the ink is received, The ink leached onto the surface,
It does not contaminate equipment, operators, or the surrounding area, and the surface does not become sticky under high temperature and high humidity conditions.

Further, the powder used in the present invention and which is the second characteristic of the present invention is a powder applied on the ink permeable layer on the ink retaining layer, and when the recording material is applied to a printer, it has excellent properties. It has the function of exhibiting ink fixability, smooth transportability, and excellent blocking resistance even when a large number of recording materials are stacked.

The inventors of the present invention have conducted intensive research to realize the above-mentioned functions, and have discovered that the above-mentioned functions can be achieved by applying a certain type of powder onto the ink-permeable layer.

The powder having the above-mentioned functions is preferably a fine powder with a particle size of 20 pm or less, such as silica, clay, talc, carbon dioxide, calcium charcoal, calcium sulfate, barium sulfate, aluminum silicate, synthetic zeolite, alumina. Examples of organic powders include higher fatty acids or their salts, such as aluminum stearate, calcium stearate, and anionic, cationic, nonionic, and amphoteric powders. Surfactants that are solid at room temperature, e.g.
Examples include sodium dodecylbenzenesulfonate, sodium laurylsulfonate, potassium laurylsulfonate, sodium stearylsulfonate, and polyethylene glycol nonyl phenyl ether with a relatively high ILB.

Such powder is deposited on the ink permeable layer at a rate of about 0.01 g-1.
,0 g/rn''.

In order to apply the above-mentioned materials onto the ink permeable layer, powder particles may be applied directly, or they may be applied by dispersing or suspending them in a suitable liquid (for example, water). Methods for applying the above-mentioned materials to the ink-permeable layer include dipping, coating, spraying, roller coating, electrostatic adsorption, and the like.

The recording material of the present invention having the basic structure as described below has significantly improved ink receptivity, ink fixing performance, and transportability compared to a recording material that does not have powder on the ink permeable layer. It's amazing what's happening.

The powder applied on the permeable layer has a large number of capillary voids in both the amount of powder and the powder itself, and due to the capillary action, the ink diffuses through the powder at a high speed and spreads over a wide area. and reaches the permeable layer. Therefore, it is thought that the synergistic effect with the powder applied to the permeable layer significantly improves ink receptivity, ink fixability, and transportability.

Furthermore, since the powder is applied to the top layer, it also has functions that are important from a practical standpoint, such as smooth transport in the printer, no fingerprints, and no blocking when stacking. The value of the product is significantly improved.

The above is the basic configuration of the present invention, but in an embodiment in which the recording material of the present invention is translucent, a translucent material is used as the base material, and an ink retaining layer, an ink permeable layer and a powder layer are used. When forming these layers, it is necessary to ensure that their translucency is not impaired. However, to the extent that the translucency is not impaired, for example, silica, clay, talc, diatomite, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, synthetic zeolite, alumina, zinc oxide, etc.
Fillers such as Litopone, Satin White, etc. can also be dispersed in the ink retaining layer and/or the ink permeable layer.

In the present invention, sufficient light transmittance means that the recording material exhibits a linear light transmittance of at least 2% or more, and preferably a linear light transmittance of 105 or more.

If the linear light transmittance is 2% or more, it is possible to project and observe the recorded image onto a screen using OHP, for example, and in order to clearly observe the details of the recorded image,
It is desirable that the linear transmittance is 105 or more.

The linear transmittance T (%) here refers to the incident perpendicular to the sample, transmitted through the sample, and at least B
Measure the spectral transmittance of the straight light that passes through the light-receiving side (3/ ) on the extension of the incident optical path that is further away than css and is received by the detector using, for example, the 323-type Hitachi self-recording spectrophotometer (Hitachi, Ltd. division). The Y value of the tristimulus value of one color is determined from the measured spectral transmittance, 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 the recorded and non-recorded areas, it is necessary to make sure that the non-recorded areas in the projected image are bright, that is, the straight line of the recording material. It is required that the light transmittance 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 should be 2% or more, and in order to obtain a clearer image, preferably 10% or more. More preferably, it is 50% or more. Therefore, a recording material suitable for this purpose must have an in-line transmittance of 2% or more.

Further, in an embodiment in which the recording material of the present invention is opaque, an opaque material may be used for at least one layer among the base material, ink retaining layer, ink permeable layer, and powder layer.

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 explained above by illustrating typical aspects of the recording material of the present invention, but of course the recording material of the present invention is not limited to these aspects. Also, the ink retaining layer can contain various known additives such as dispersants, fluorescent dyes, pH regulators, antifoaming agents, lubricants, preservatives, and surfactants.

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 colored recording liquids adhere to the same cylinder in a short period of time, there is no flow out or oozing of the recording liquid, and images with high resolution, clarity, and excellent coloring are produced. can get. Furthermore, when using an optical device such as a slide or OHP to project a recorded image onto a screen, etc. for observation, attached ink droplets are more likely to interfere with other adjacent areas than with conventional recording materials. Since the images are enlarged and fixed to such an extent that they do not overlap excessively, the transmitted light becomes even more uniform, providing 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 IL was used as a translucent base material, and coating liquid A having the following composition was applied onto this film so that the film thickness after drying was 201 L.
It was coated using a bar coater method so that the ink retention layer was formed by drying at 60°C for 20 minutes.
#Lm, dried at 60°C for 15 minutes to form an ink permeable layer made of fine particles, and then
Clay (kaolin clay, made by Ueya Kaolin, particle size distribution 0
．． 1 to 5 gm) was applied at a rate of 1.0 g/nf by electrostatic adsorption to obtain a translucent recording material of the present invention.

Coating liquid A composition: Polyvinylpyrrolidone (K-90, manufactured by GAF) 15 parts water
8
5 parts Coating liquid B composition; polyvinyl acetate (Movinyl 303, manufactured by Hoechst) 10 parts water
90 parts The thus obtained recording material of the present invention was colorless and transparent.

Example 2 In place of the powder in Example 1, sepiolite (Need Plus, manufactured by Takeda Pharmaceutical Co., Ltd., particle size distribution 0.5 to 52 m) was used and applied at a rate of 0.8 g/rf, and the transparent material of the present invention was A recording material was obtained.

Example 3 In place of the powder in Example 1, anhydrous silica (Aerosil MOX-80, manufactured by Nippon Aerosil, average particle size 0.0
3 parts m) were applied at a rate of 0.1 g/g to obtain a translucent recording material of the present invention.

Examples 4-6 Examples 1-3 except that art paper was used as the base material
A recording material of the present invention was obtained in the same manner as described above. This recording material is white and opaque.

Example 7 A polyethylene terephthalate film (manufactured by Ondai) with a thickness of 100 p, ta was used, and coating solution A having the following composition was applied onto this film using a bar coater so that the film thickness after drying was 1001 L. Coated according to the method.

After drying at 80°C for 1 hour and 20 minutes to form an ink retaining layer, the following coating solution B was applied onto the ink retaining layer so that the dry film thickness was 5 pm.
Example 1 The ink retaining layer, the ink transmitting layer and the powder layer were applied in the same manner as above, and the ink retaining layer, ink transmitting layer and powder layer were combined and peeled off from the base material to obtain a translucent recording material of the present invention.

Coating liquid A composition: Polyvinyl alcohol (PVA 420, manufactured by Kuraray) 10 parts water
9
0 parts Coating liquid Bm composition: Acrylic acid ester (Sevian A45125, manufactured by Daicel) 10 parts water
90
Part Example 8 Instead of the powder in Example 7, diatom ± (Super FLO8S, manufactured by Ueya Kaolin, particle size distribution 0.05-5
#Lm) and applied at a rate of 0.4 g/m'',
A transparent recording material of the present invention was obtained.

Comparative Examples 1 to 3 Comparative recording materials were prepared in the same manner as Examples 1.4 and 7, except that no powder was applied on the ink permeable layer.

The following four types of ink were used on the recording materials obtained in Examples 1 to 8 and Comparative Examples 1 to 3, using an on-demand inkjet recording head (discharge orifice) that discharges ink using a piezo vibrator. Inkjet recording was carried out using a recording apparatus having a diameter of 65 pm, a piezo vibrator drive voltage of 70 cm, and a frequency of 3 KHz.

Yellow ink (composition) (,1, Direct Yellow 86 2 parts N-methyl-2-pyrrolidone 10 parts diethylene glycol
20 parts Polyethylene glycol #200 15%
, water
55 parts.

Magenta ink (composition) C, ■, Acid Red 35 2 parts N-methyl-2-pyrrolidone 10 parts diethylene glycol
20 parts polyethylene glycol #200 15 parts water 5
5 parts cyan ink (composition) C, 1, 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 15 parts water 55
The evaluation results of the recording materials of Examples and Comparative Examples are shown in Table 1. Each evaluation item in Table 1 was measured according to the method described in F.

(1) Ink fixation time was measured by leaving the recording material at room temperature after recording and measuring the time taken for the ink to dry and stop adhering to the finger when touching the recorded image with the finger.

(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) OHP suitability was measured as a representative example of optical equipment, and the recorded image was projected onto a screen using OHP.
Judgment was made by visual observation, and a 0. The non-recorded area is rather dark, the OD of the recorded image is slightly low, the pitch width is 0.5cm, the thickness is 0.25mm, and the line of the intestine cannot be clearly distinguished. A sample having a considerably low OD and a line with a pitch width of 14 m and a thickness of 0.3 cm cannot be clearly distinguished, or a sample in which a non-recorded area and a recorded image cannot be distinguished is rated as "X".

(4) Straight line transmittance is determined by measuring the spectral transmittance using a 323-type Hitachi self-recording spectrophotometer (newly manufactured by Hitachi), keeping the distance from the sample to the light-receiving side at approximately 90 square meters, and measuring the spectral transmittance as described above. (
1) It was calculated using the formula.

(5) Conveyance performance was determined by cutting the recording material into the size of an A4 plate,
An inkjet printer (Canon A1210) was used to evaluate the number of times the recording material stopped moving until the A4 size printing was completed, and a score of 0 was given if it never stopped.

(6) Fingerprint resistance is measured by touching the recording surface of the recording material with the fingers of both hands.
A book was pressed against the surface and evaluated based on the number of fingerprints left on the surface, and those with no fingerprints left were scored as 0.

(7) Blocking resistance was measured by cutting the recording material into A4 size pieces, stacking 50 sheets and placing a board on top of the 10 kg
After applying a load of 1 month and leaving it in a room for 1 month, remove the load.
The blocking state of the film was observed. Those with no blocking were represented as O, and those with blocking were represented as ×.

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Claims (1)

[Claims] A recording material comprising an ink retaining layer and an ink permeable layer, the ink permeable layer being a layer of fine particles, and powder being applied on the ink permeable layer.