JPS63286393A - Material to be recorded and recording method using said material - Google Patents

Abstract

PURPOSE:To obtain a material to be recorded superior in ink absorption and ink fixing properties and to obtain a recording image with high optical density superior in color developing properties, color forming properties, and resolving power, by a method wherein, the material to be recorded is provided with an ink transfer layer and an ink holding layer, and a protective layer is also formed on a substrate supporting these layers, and the protective layer is peeled-off after a recording is completed. CONSTITUTION:A material to be recorded is composed of a substrate as a base material having a releasable protective layer on one surface thereof, an ink holding layer which is formed on the other surface of the substrate to absorb and hold an ink or a recording agent, and an ink transfer layer accepting the ink on the ink holding layer and having liquid-transmitting properties, without possibility that the recording agent remains. As the transparent substrate, a plastic film or sheet of polyester resin, polyimide resin, etc., or a glass sheet is used. In addition, the protective layer is formed on the transparent substrate on the opposite surface to the ink holding layer. The protective layer is peeled-off after an image is formed on the material to be recorded. In this manner, abrasion resistance is imparted on the surface, and carrying properties in a recorder is also enhanced.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applicable to felt pens, fountain pens, pen plotters, inkjet recording devices, etc.
A recording material suitable for a recording method using a recording method, especially a material that has excellent ink absorption properties and can produce high-quality images with excellent color properties, optical density, scratch resistance, transportability, secrecy, texture, etc. The present invention relates to a recording material and a recording method using the recording material.

(Prior Art) Conventionally, recording methods using ink, such as writing with a fountain pen, felt pen, ballpoint pen, etc., pen plotter,
Examples of the recording material used for recording with an inkjet recording apparatus include general paper such as high-quality paper, bond paper, and writing paper, and coated paper such as art paper and cast coat 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 a satisfactory level in terms of ink absorption, chromaticity when a plurality of inks are deposited on the same area, chromaticity, etc.

In order to solve these problems, coated paper having a porous ink absorbing layer on the surface of the base material, as typified by inkjet paper, has been devised.
-136480, the refractive index is 1.5 on the support.
An inkjet recording medium provided with an ink-receiving layer mainly composed of a pigment of 8 or less is described.

Unlike conventional recording media, this recording medium allows the recorded image to be observed from the support side, and the ink-receiving layer adjacent to the support is made mainly of pigments with a refractive index of 1.58 or less. By configuring it as such, it is possible to obtain a recorded image with good color reproducibility and color density.

However, although this recording reef body has relatively good ink absorption, since the pigment layer is used as an ink absorption/retention layer, it has the drawbacks of poor ink fixability and poor resolution, color, and optical density of recorded images. be.

In addition, recently, as the speed and quality of recording using inkjet recording devices, pen plotters, etc. has increased,
Recording materials are also required to have dramatic recording performance.

In other words, there is a need for recording materials that are significantly superior to conventional recording materials in all aspects of recording performance, including ink absorption, recording material color development, recorded image quality, resolution, color, recorded image density, and gloss. It's here.

Furthermore, there has been a need for recording materials that are excellent in preventing scratches during storage, light resistance during storage, and confidentiality during storage after recording. Furthermore, there has been a need for recording materials that are superior in cost, transportability during recording, and texture.

(Problems that the invention is trying to solve) However, at present, a recording material and a recording method that simultaneously satisfy all of these recording characteristics have not yet been obtained.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a recording material and a recording method having excellent ink absorption and ink fixing properties. It is an object of the present invention to provide a recording material and a recording method that allow excellent recorded images to be obtained.

Another object of the present invention is to provide a recording material and a recording method that are excellent in cost, transportability during recording, and texture.

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

(Means for solving the problem) That is, the present invention consists of two inventions, the first of which is a recording material having an ink transport layer and an ink retention layer, which supports these layers. This recording material is characterized in that a protective layer is provided on the surface of the base material.

Furthermore, a second invention is a recording method in which recording is performed using ink on a recording surface of a recording material, wherein the recording material has an ink transport layer and an ink holding layer, and supports these layers. This recording method is characterized in that a protective layer is provided on the surface of the base material, and the protective layer is peeled off at a necessary time after recording is performed.

(Function) By providing a removable protective layer on the image observation surface of the recording material, a good surface protection effect is achieved before, during and after recording, and scratch resistance is imparted to the surface. or,
Deterioration of an image after recording due to light is mainly due to light incident from the image observation surface, but by providing an opaque barrier layer on that surface, light resistance during storage is improved. Furthermore, confidentiality of the recorded information is imparted, and furthermore, by providing the protective layer, so-called "stiffness" is imparted to the recording material, and transportability within the recording apparatus during recording is also improved.

(Preferred Embodiments) Next, the present invention will be described in more detail by citing preferred embodiments of the present invention.

The recording material of the present invention is different from conventional recording materials in which the recording surface and the observation surface are the same, and the recording surface and the observation surface are in a front-back relationship.

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

The ink transport layer of the recording material of the present invention has liquid permeability and has the function of quickly absorbing and transmitting the ink attached to its surface, while the ink retaining layer has the ability to absorb and transmit ink adhering to its surface. It has the function of absorbing and retaining ink or recording material.

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

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

If the ink transport layer does not have properties such as wetting, permeation, and diffusion with respect to ink, when ink is applied to the surface of the ink transport layer, it may not quickly penetrate into the ink transport layer. This results in a decrease in ink absorption.

Furthermore, the ink remains retained within the ink transport layer and does not reach the ink retaining layer, making it impossible to obtain a recorded image with excellent image optical density, color development, and water resistance.

Furthermore, if the ink transport layer has properties such as adsorption, penetration, and reaction with respect to the recording agent, the recording agent will remain on the surface or inside the ink transport layer and will not reach the ink holding layer. Therefore, it becomes impossible to obtain a recorded image with high optical density and sufficient color properties.

The ink retaining layer of the recording material of the present invention must have a stronger ability to absorb ink than the ink transport layer in order to stably absorb and capture the ink temporarily absorbed by the ink transport layer.

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

The ink transport layer and ink holding layer as described above are generally provided on a transparent substrate, and when recording is performed by applying ink to the ink transport layer, which is the surface layer, the ink passes through the ink transport layer and is adsorbed and retained by the ink holding layer. As a result, an image with excellent optical density can be observed from the substrate side.

The main feature of the present invention is that a removable protective layer is provided on the surface of the base material of the recording material as described above, and with this structure, scratch resistance is imparted to the recording material before recording, and after recording. The present invention was also based on the discovery that scratch resistance, light resistance, secrecy, texture, etc. can be imparted, as well as excellent conveyance properties during recording.

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 having a removable protective layer on one surface, and substantially absorbs and captures ink or recording agent formed on the other surface of the base material. It consists of an ink retaining layer and an ink transport layer formed on the ink retaining layer, which directly receives ink, has liquid permeability, and leaves virtually no recording material behind.

However, if the ink transport layer or ink retention layer also functions as a support, the base material may also serve as a removable protective layer.

As the transparent base material used in the present invention, any conventionally known transparent base material can be used, and specifically, polyester resin, diacetate resin, triacetate resin, polystyrene resin, polyethylene resin, polycarbonate resin, polymethacrylate resin, cellophane resin, etc. Examples include plastic films, plates, and glass plates such as celluloid, polyvinyl chloride resin, polyvinylidene chloride resin, and polyimide resin. These base materials may have any thickness, but are generally about 1 μm to 5,000 μm. Note that, as described above, in the present invention, since a recorded image is observed from the side opposite to the recording side, the base material needs to have light-transmitting properties.

In addition, if the base material used finally has translucency,
Any processing may be performed on the base material, for example, it is possible to provide the base material with a desired pattern, a moderate gloss or a textured pattern. Furthermore, by selecting a base material that has water resistance, abrasion resistance, blocking resistance, etc., it is also possible to impart water resistance, abrasion resistance, blocking resistance, etc. to the image observation surface of the recording material. .

A protective layer is provided on the surface of the transparent substrate opposite to the ink retaining layer. This protective layer may be transparent like the base material described above for the purpose of imparting scratch resistance to the image, but in order to impart scratch resistance, light resistance, confidentiality, etc. to the image, It is preferable to use a base material colored white or colored, or an opaque material such as paper or cloth.

The above-mentioned protective layer is desirably removable, and the method for providing this protective layer is to treat the surface of the base material with a release agent if necessary, and then coat the surface with a solution or melt of the resin. A method of heat-pressing a plastic film or paper, or a method of bonding using an adhesive or a pressure-sensitive adhesive is used.

Further, in order to prevent bubbles from being mixed in when forming the protective layer, the protective layer can be easily formed using a commercially available laminator. The thickness of such a protective layer is preferably about 1 to 500 μm. These protective layers can be formed before or after forming the ink transport layer and the ink retention layer on the base material.

The ink transport layer constituting the recording material of the present invention as described above needs to have liquid permeability.

In the present invention, liquid permeability means that ink can pass through quickly;
This refers to the property of not substantially leaving the recording agent in the ink within the ink transport layer.

In the present invention, liquid permeability refers to the property of an ink transport layer that allows ink to pass through in accordance with the ink absorbency of the ink holding layer and does not substantially leave the recording agent in the ink within the ink transport layer. A preferred embodiment for adjusting liquid permeability is to form a porous structure having appropriate cracks and communicating pores (including micro-sized ones) inside the ink transport layer.

For example, when recording using water-based ink, the following aspects may be mentioned.

(1) An embodiment consisting of non-porous particles and a binder and having internal cracks.

(2) A mode in which the inside of the layer is made porous by dispersing other materials in the coating and treating it with a solvent.

(3) A mode in which the resin is dispersed in a mixed solvent, and the high boiling point solvent fills the inside of the layer as a poor solvent for the resin.

(4) A mode in which a foamable material is contained during film formation to make the inside of the layer porous.

The materials used at this time are selected to be non-swellable to water and the solvent in the ink, and non-stainable to the dye in the ink.

An ink transport layer that satisfies the above-mentioned characteristics is preferably composed mainly of the particles (1) that are non-stainable to the recording agent and a binder.

Such particles include the recording agent in the ink, that is,
Any particles may be used as long as they do not substantially adsorb dyes, etc., and particularly suitable particles in the present invention include highly hydrophobic thermoplastic resins, thermoplastic resins, etc., since dyes in inks are generally water-soluble. Organic pigments such as curable resins, such as polystyrene, polymethacrylate, elastomers, ethylene-vinyl acetate polymers, styrene-acrylic copolymers, polyesters, polyvinyl ethers, polyamides, polyolefins, guanamine resins, resin powders such as SBR,
At least one of these emulsions, suspensions, and powders of inorganic pigments may be used as desired.

Such particles have a particle size of 0.1 to 100 μm.
It is preferable that it is in the range of .

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

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, and ethylene-vinyl acetate copolymer. combination, starch, polyvinyl butyral, gelatin, casein,
Ionomer, gum arabic, carboxymethylcellulose, polyvinylpyrrolidone, polyacrylamide, phenolic resin, melamine resin, epoxy resin, styrene-butadiene rubber, area resin, α-olefin resin,
One or more resins such as chloroprene, nitrile rubber, vinyl urethane, polyurethane, and polyester can be used as desired.

Furthermore, in order to improve the function as an ink transport layer, various additives such as plasticizers, ultraviolet absorbers, antioxidants, anti-piping agents, anti-aging agents, and optical brighteners may be added as necessary. , colorants, surfactants, penetrants, etc. may be added to the ink transport layer.

The ratio of binder/binder ratio is preferably in the range of 115 to 50/1, and more preferably in the range of 1/3 to 20/1. If there is too much binder in this mixing ratio, the number of cracks and communicating pores in the ink transport layer will decrease, reducing the ink absorption effect. Furthermore, if there are too many particles in the mixing ratio, the porosity will increase, but the image quality will deteriorate, and furthermore, the adhesion between the particles or between the ink holding layer and the particles will not be sufficient, making it impossible to form an ink transport layer. .

In the present invention, the thickness of the ink transport layer is 1 to 2
00 μm is preferred. More preferably, it is 5 to 100 μm. If the thickness of the ink transport layer is less than 1 .mu.m, the ink absorbency will be extremely poor, the bleeding of dots will be large, and the resolution will be significantly reduced. Therefore, the sharpness of the image is also significantly reduced.

On the other hand, if the thickness of the ink transport layer exceeds 200 μm, although the ink absorbency improves, the ink permeability decreases significantly, and the ink remains in the ink transport layer, making it difficult for the ink to reach the ink holding layer. , the concentration from the substrate side will drop significantly.

Next, the non-porous ink retention layer that substantially captures the ink or recording agent absorbs and captures the recording agent in the ink that has passed through the ink transport layer, and retains it substantially permanently. Therefore, 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, so that the ink permeates and diffuses laterally within the ink transport layer 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, since the recorded image is observed from the side opposite to the recording surface, the ink retaining layer is preferably light-transmissive.

The ink retaining layer that satisfies the above requirements is preferably composed of a light-transparent resin that adsorbs the recording agent and/or a light-transparent resin that is soluble and swellable with respect to the ink.

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

The thickness of the ink retaining layer only needs to be sufficient to absorb and trap ink, and although it varies depending on the amount of ink droplets, it is preferably 1 to 100 μm, more preferably 3 to 50 μm.

The material constituting the ink retaining layer may be any material as long as it can absorb water-based ink and retain the coloring material in the ink, but since the ink is mainly water-based, water-soluble or hydrophilic materials may be used. Preferably, it is formed from a polymer. 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, polyvinylbilicylium pallide, melamine resin, phenolic resin, alkyd resin,
Examples include synthetic resins such as polyurethane, polyvinyl alcohol, ion-modified polyvinyl alcohol, polyester, and sodium polyacrylate.

In addition, preferable hydrophilic polymers other than those mentioned above include the following polymers.

(1) A block copolymer or graft copolymer having a hydrophilic segment and a hydrophobic segment in the molecule. Such a block copolymer or graft copolymer is water-insoluble as a whole, but is hydrophilic. Hydrophilic segments of such polymers include, for example, hydrophilic groups such as carboxyl groups, sulfonic acid groups, hydroxyl groups, ether groups, acid amide groups, methylolated groups thereof, 41- to tertiary amino groups, and quaternary ammonium groups. It is a segment in which two or more vinyl monomers having a functional group are polymerized, and examples of such hydrophilic monomers include (meth)acrylic acid, maleic anhydride, vinyl sulfonic acid, sulfonated styrene, vinyl acetate, Mono(meth)acrylates or monomalates of polyols such as ethylene glycol,
(meth)acrylic acid amide and their methylolated products,
Examples include mono- or dialkylaminoethyl (meth)acrylate, quaternized products thereof, vinylpyrrolidone, vinylpyridine, and the like.

Hydrophobic polymer segments include olefins such as ethylene, propylene and butylene, aromatic vinyl compounds such as styrene, methylstyrene and vinylnaphthalene, halogenated olefins such as vinyl chloride, vinylidene chloride and vinylidene fluoride, (meth) It is a polymer of two or more of acrylic acid, crotonic acid, and various alcohol esters of saturated carboxylic acid.

Naturally, hydrophobic natural or synthetic polymers obtained by modifying water-soluble polymers other than those mentioned above to be water-insoluble can also be used as the hydrophilic polymer segment or the hydrophobic polymer segment.

(2) Crosslinked products of water-soluble polymers The various water-soluble polymers described above are crosslinked using a suitable crosslinking agent or radiation to the extent that they become water-insoluble without losing their hydrophilicity.

(3) Polymer complex, a polymer complex is composed of two or more water-soluble or hydrophilic polymers that are different from each other and exert an action on each other; For example, two or more types of polymers form some kind of strong bond due to interionic electrostatic force, hydrogen bonding, van der Waals force, partial transfer of charge, etc.

Although various kinds of polymer complexes can be used, a particularly preferred one in the present invention is a polymer complex consisting of a basic polymer and an acidic polymer.

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 the coating solution is coated with, for example, Preferably, the material is coated onto a substrate to a predetermined thickness by a known method such as a roll coating method, a rod bar coating method, a spray coating method, an air knife coating method, etc., and then quickly dried. A coating method or a method in which a single sheet of a predetermined thickness is formed from the above-mentioned material and then laminated onto a base material may be used.

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

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

In the recording method of the present invention, the ink itself applied to the ink-retaining layer of the above-mentioned specific recording material for image formation may be a known ink, such as a direct dye, an acid dye, or a basic ink. Water-soluble dyes represented by dyes, reactive dyes, food colorings, etc., are particularly suitable as inkjet inks, and when combined with the recording materials mentioned above, improve fixing performance, color development, clarity, and stability. , preferable ones that give an image that satisfies light fastness and other required performances are:
For example, C,1, Direct Black 17.19.32.51.
71.108.146, C,1, Direct Blue 6.22.25.71.86
．． 90.106.199, c,i, Direct Red 1.4.17.28.83, C,1, Direct Yellow 12.24.26.86.9
8.142, [;, 1. Direct Orange 34.39.44.46
．． 60, C, 1, Direct Violet 47.48, C, 1,
Direct dyes such as Direct Brown 109, C,1, Direct Green 59, C,1
, Acid Black 2.7.24.26.31.52.
63% 112.118, C, r, 7side blue 9.
22.40, 59.93.102.104.113.1
17.120.167.229.234, C, 1, Acid Red 1, 6.32.37.51.5
2.80.85.87.92.94.115.180.
256.317.315, C, 1, Acid Yellow 11.17, 23.25.29
．． 42.61.71, (:, 1. Acid orange 7% 19 and c, i, acid violet 49 and other acid dyes are preferred; others: C, 1, Basic Black 2; C, 1, Basic Blue 1.3 .5.7.9.24.
25.26.28.29, c, r, 'Basic Red! , 2.9.12.13.
14, 37, c, r, basic violet 7.14.27, c,
1. Food black 1.2 etc. can also be used.

The above examples of dyes are particularly preferable for inks applicable to the recording method of the present invention, but dyes for inks used in the present invention are not limited to these dyes. Such water-soluble dyes are generally used in a proportion of about 0.1 to 20% by weight in conventional inks, and this proportion may be the same in the present invention.

A suitable solvent for use in the ink used in the present invention is water or a mixed solvent of water and a water-soluble organic solvent, and particularly preferred is a mixed solvent of water and a water-soluble organic solvent, which is a water-soluble solvent. It contains polyhydric alcohol, which has the effect of preventing ink from drying, as an organic solvent. Further, as water, it is preferable to use deionized water rather than ordinary water containing various ions.

Examples of water-soluble organic solvents used in combination with water include methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, 5ec-butyl alcohol, terL-butyl alcohol, and isobutyl alcohol. Alkyl alcohols having 1 to 4 carbon atoms; amides such as dimethylformamide and dimethylacetamide; ketone or keto alcohols such as acetone and diacetone alcohol; ethers such as tetrahydrofuran and dioxane; polyalkylenes such as polyethylene glycol and polypropylene glycol Glycols: ethylene glycol, propylene glycol, butylene gelcol, triethylene glycol, 1,2,6-hexandriol, thiodiglycol, hexylene glycol, diethylene glycol, etc. where the alkylene group contains 2 to 6 carbon atoms Alkylene glycols: Glycerin: Lower alkyl ethers of polyhydric alcohols such as ethylene glycol methyl (or ethyl) ether, diethylene glycol methyl (or ethyl) ether, triethylene glycol monomethyl (or ethyl) ether; N-methyl-2-pyrrolidone , 1,3-dimethyl-2-imidazolidinone, and the like. Among these many water-soluble organic solvents, polyhydric alcohols such as diethylene glycol and lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl (or ethyl) ether are preferred.

The content of the water-soluble organic solvent in the ink is generally 0 to 95% by weight, preferably 10 to 80% by weight, more preferably 20 to 5% by weight based on the total weight of the ink.
It is in the range of 0% by weight.

In addition to the above-mentioned components, the ink used in the present invention may optionally contain a surfactant, a viscosity modifier, a surface tension modifier, and a pH modifier.
Modifiers and the like may be included.

In the present invention, the method for forming an image on the ink retaining layer of the recording material is not particularly limited, and may be any recording method such as a felt pen, ballpoint pen, fountain pen, pen plotter, etc., but from the viewpoint of high speed recording. Preferably, a pen plotter type or an inkjet type is used.

Any type of inkjet method may be used, and representative examples of these methods include, for example.

EEE Transactions On Industry Applications
actions on IndustryApp
lications) Vol.

J^-13, No. 1 (February/March 1977 issue), Nikkei Electronics April 19, 1976 issue, 197
It is described in the January 29, 1974 issue and the May 6, 1974 issue. The methods described above are suitable for the method of the present invention.

In addition, there is an inkjet method in which ink subjected to the action of thermal energy undergoes a rapid volume change, and the acting force due to this state change is used to eject the ink from a nozzle. can also be used effectively.

In the method of the present invention, after an image is formed on the recording material using the above-described ink and recording method, the protective layer is peeled off. The protective layer may be peeled off immediately after image formation, or it may be kept as is and peeled off when necessary, and the timing of peeling off is not particularly limited.

In the recording method of the present invention, since the recording 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 the conventional method.

However, in the recording material of the present invention, the ink transport layer can be made transparent by heating after recording, and in such a case, the recording surface can also be used as an observation surface.

Therefore, in such a case, characters etc. may be recorded in a normal state.

(Effect) By providing a removable protective layer on the image observation surface of the recording material, a good surface protection effect was achieved before and during recording, and the surface was provided with scratch resistance. Furthermore, the deterioration of the image after recording due to light is mainly due to the incidence of light from the image observation surface, but by providing an opaque protective layer on that surface, the light resistance during storage was improved. Furthermore, confidentiality of the recorded information is imparted, and furthermore, the so-called "firmness" of the recording material is imparted by providing the protective layer, and transportability within the recording apparatus during recording is also improved.

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

Example 1 A polyethylene terephthalate film (thickness 75 μm, manufactured by Toshi) was used as a translucent base material, and a white opaque white polyethylene terephthalate film (thickness 25 μm, manufactured by ICI) was used as a protective layer on one side of this film. was heat laminated. Next, the following composition A was coated on the base material surface of the composite film by a bar coater method so that the dry film thickness was 8 μm, and dried in a drying oven at 120° C. for 5 minutes.

Kouihara Δ Polyviny-Ak'o Ridone (PVPM-90, manufactured by GAF, 10% DMF solution) 90
styrene/acrylic acid copolymer (oxilac 5H-
2100, manufactured by Nippon Shokuryo Chemical Co., Ltd., 10% DMF solution) 10 parts of the composition B shown below was further applied using a bar coater method to a dry film thickness of 50 μm, and dried in a drying oven at 80° C. for 10 minutes. A recording material of the present invention was obtained.

Red-colored elastomer dispersion (Chemivar A-100, solid content 4
0%, manufactured by Mitsui Petrochemical Industries) 100 parts ethylene
Vinyl acetate copolymer dispersion (Chemipar V-100, solid content 40%, manufactured by Mitsui Petrochemical Industries)
110 parts Sodium dioctyl sulfosuccinate (Perex 0T-P, solid content 70%, manufactured by Kao) 0
．． Part 1: Using the four types of ink shown in Table 1 below on the above recording material, generate bubbles with a heating resistor,
Solid inkjet recording was performed using a recording apparatus having an on-demand type inkjet recording head that ejects ink at that pressure.

The ink droplet diameter at this time was 50 μm.

The compositions of the four inks used are shown in Table 1 below.

71 Gosakadama Danjienori C, 1, Direct Yellow 86 2 parts N-methyl-2-pyrrolidone 10 parts diethylene glycol 20 parts polyethylene glycol #2
00 15 parts water
55 parts Part L color name 5 Otori C, 1, Acid Red 35 2 parts N-methyl-2-pyrrolidone 10 parts diethylene glycol 20 parts polyethylene glycol #2
00 15 parts water
55 parts 2l] Shijin 2 Gen C, 1, Direct Blue 86 2 parts N-methyl-2-pyrrolidone 10 parts diethylene glycol 20 parts polyethylene glycol $20
0 15 parts water
55 parts Gura' 3 Shijin 2 Gen C, 1, Food Black 2 2 parts N-methyl-2-pyrrolidone 10 parts diethylene glycol 20 parts polyethylene glycol@Z
oo 15 parts water
55 copies The recorded matter thus obtained has a low image density when viewed from the ink transport layer side, and almost no image is observed from the protective layer side, but when the protective layer is peeled off, the image becomes clear from the substrate side. images are observed.

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.

(1) Ink absorption was measured by leaving the recorded matter at room temperature after inkjet recording, and measuring the time until the ink was sufficiently dried and fixed without adhering to the recorded area even when touched with a finger.

(2) The image optical density (0,0,) is the Macbeth densitometer T
After peeling off the protective layer using R-524, measurements were taken from the image viewing surface (substrate side) of the black ink recorded area.

(3) Scratch resistance during logistics storage was determined by laminating 100 sheets of A4 size recording material without peeling off the protective layer, and vibration (601 (
z・3G) was added for 24 hours, and then the protective layer was peeled off and scratches on the translucent base material were visually observed. Those that were not scratched by vibration were rated O1, those that were slightly scratched were rated Δ, and those that were significantly scratched were rated ×.

(4) Confidentiality of the recorded image is evaluated by visually observing the actual image recorded on the recording material with the inkjet recording device through the protective layer, and evaluating whether or not the actual image can be recognized.If the image cannot be recognized, it is recognized as O1. Those that are possible are marked as ×.

(5) Conveyance during recording was evaluated using a color BJ printer (manufactured by Canon, BJC430) based on whether or not there was a problem with conveyance, and those with no problem and those with Ol were graded as ×.

For reference, the optical density from the protective layer side and the optical density from the ink transport layer side are also shown in Table 1.

Example 2 The entire procedure was the same as in Example 1 except that instead of the white polyethylene terephthalate film as a protective layer, kraft paper (basis weight 3 Gg) with polyvinyl alcohol as an adhesive layer was laminated in a humidified atmosphere.

゛ Example 3 A translucent base material (with a polyethylene film (thickness: 50 μm) laminated with an embossed pattern as a protective layer)
Polyethylene terephthalate, manufactured by Toshi, thickness 25μm)
The procedure was the same as in Example 1 except that .

Comparative example 1 The entire procedure was the same as in Example 1 except that no protective layer was used.

Comparative example 2 The entire procedure was the same as in Example 3 except that no protective layer was used.

Ink absorption 1 second 1 second 1 second 1 second 1 second Image optical density 1.97 1.98 1.98 1.97
1.97 Scratch resistance ooo xx Confidentiality ooo xx Transportability ooo ox

Claims (5)

[Claims] (1) A recording material having an ink transport layer and an ink holding layer, characterized in that a protective layer is provided on the surface of a base material that supports these layers. (2) The recording material according to claim (1), wherein the protective layer is removable. (3) The recording material according to claim (1) or (2), wherein the protective layer is opaque. (4) In a recording method in which recording is performed using ink on the recording surface of a recording material, the recording material has an ink transport layer and an ink retention layer, and the surface of the base material that supports these layers. A recording method comprising: a protective layer; and the protective layer is peeled off at a necessary time after recording. (5) The method according to claim (4), wherein the protective layer is opaque.