JPH10157280A - Recording material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a recording material capable of being printed repeatedly by ink jet printing without deteriorating its recording performance even in the case of using many times by incorporating mat or porous surface and a solvent receiving layer becoming opaque when no solvent exists and transparent when solvent is received. SOLUTION: The recording material comprises a mat or porous surface and a solvent receiving layer becoming opaque when no solvent exists and transparent when solvent is received. Thus, it is normally opaque but when transparent solvent is printed as ink by ink jet printing, a printed part of the layer holds the solvent in a recess of the matte surface or porous pores to become opaque so that the transparent printed part can be recognized with respect to the opaque non-printed part. That is, the surface receiving layer of the printed part is brought into contact with the solvent so that its refractive index is changed to be transparent. When it is left to stand after recording, the solvent is evaporated, the printed part becomes opaque, and hence can be again printed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording material, and more particularly to a recording material for ink jet printing which can be reused many times.

[0002]

2. Description of the Related Art With the spread of computers in recent years, various documents have been digitized, and with the spread of electronic mail and the like, documents are often exchanged only on a CRT.

However, electronic documents are still often used by being printed on a medium such as paper by various printers. When printing with a printer, printing is often performed without the purpose of preservation from the beginning for the purpose of trial printing or the like, and in fact, a large amount of waste of recording material such as paper is generated.

[0004] In order to use the recording material many times, it is conceivable to use ink that loses its color due to the chemical treatment. However, in such a chemical treatment, components such as ink remain on the recording material and the recording performance is reduced. Gradually deteriorates, which is not preferable.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention can be applied to printing from the beginning without the purpose of preservation, especially when printing is performed many times by ink jet printing, and the recording performance is deteriorated even if used many times. It is an object of the present invention to provide a recording material that does not need to be recorded.

[0006]

The above object is achieved by the present invention.
This is achieved by a recording material having a solvent-receiving layer which has a mat-like or porous surface and is opaque when no solvent is present, but becomes transparent when the solvent is received.

[0007] The solvent receiving layer of the recording material of the present invention is usually opaque because its surface is matted or porous, but when it is printed by inkjet printing using a transparent solvent as ink. The printed portion of the solvent receiving layer becomes transparent by holding the solvent in the concave portion or the porous hole of the mat-like surface, and the transparent printed portion can be recognized with respect to the opaque non-printed portion. That is, the surface receptive layer of the portion printed with the solvent comes into contact with the solvent, the refractive index changes and becomes transparent, for example, by the same mechanism that the ground glass becomes transparent when wet with water. It is. When the recording material of the present invention after recording is left to stand, the solvent evaporates, the printed portion becomes opaque again, there is no residue from the previous printing, and it is possible to print by ink jet printing under the same conditions as before. Become.

In one embodiment of the recording material of the present invention, the surface of the solvent receiving layer has a center line average roughness of 0.1 to 3.0.
It has a mat shape of 0 μm.

In another embodiment of the recording material of the present invention,
The surface of the solvent receiving layer has a porous structure having continuous pores having a diameter of 0.01 to 5.0 μm.

In another preferred embodiment of the recording material of the present invention, a coloring layer is provided below the solvent receiving layer.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the recording material of the present invention will be described in detail.

The recording material of the present invention has a mat-like or porous surface, and has a solvent receiving layer that is opaque when no solvent is present, but becomes transparent when the solvent is received.
Such a solvent receiving layer may be provided on a support, and the solvent receiving layer itself having the above-mentioned surface characteristics has properties such as thickness, mechanical strength and the like suitable for inkjet printing. If so, the solvent receiving layer itself can be used as the recording material of the present invention without using a support.

In order to make the surface of the solvent-receiving layer of the recording material of the present invention mat-like, for example, the solvent-receiving layer may be made of a polymer binder and a pigment dispersed therein.

As the polymer binder constituting the solvent-accepting layer, a hydrophobic resin can be used for the purpose of the present invention depending on the amount and type of the pigment to be added, but a hydrophilic resin which is hardly soluble in water is preferably used. Is preferred. Examples of such a resin include polyamide, polyacrylamide, polyvinylpyrrolidone, polyethyleneimine, polyvinylpyridylium halide, melamine resin, polyurethane, cellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxymethylcellulose, polyvinyl alcohol, polyvinyl acetal, polyester, and acrylic. Resins, hydrophilic synthetic polymers such as sodium polyacrylate, and gelatin, starch, cellulose, casein, chitin, chitosan, and other natural hydrophilic polymers, and highly absorbent resins such as polyethylene oxide and copolymers thereof. Such a polymer binder needs to be transparent.

The pigment dispersed in the polymer binder is preferably a hydrophilic pigment, and may be a porous pigment. Examples of such pigments include silica (amorphous silica), clay, talc, diatomaceous earth, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, titanium oxide, zinc oxide, synthetic zeolite,
Known inorganic pigments such as alumina and smectite, as well as polyamide, polyacrylamide, polyvinylpyrrolidone, polyethyleneimine, polyvinylpyridylium halide, melamine resin, polyurethane, carboxymethylcellulose, hydroxyethylcellulose, hydroxymethylcellulose, polyvinyl alcohol, polyester, acrylic resin, etc. Organic resin fine particles comprising these pigments, and these pigments can be used alone or in combination of two or more.

These pigments themselves do not prevent a difference in appearance (ie, transparency and opacity) between when the solvent ink is applied to the solvent receiving layer and when the solvent ink is not applied, as described above.

The amount of the pigment is usually about 5 to 200 parts by weight based on 100 parts by weight of the polymer binder. If the amount exceeds 200 parts by weight, the binding ability of the resin becomes insufficient, which is not preferable. If the amount is less than 5 parts by weight, a sufficient matting effect cannot be obtained.

The average particle size of the pigment is not particularly limited as long as the above-mentioned effects can be obtained.
It should be in the range of about 3.0 μm, more preferably about 1.0 to 2.0 μm.

The thickness of the solvent-receiving layer composed of the polymer binder and the pigment dispersed therein is not particularly limited either, but is usually about 1 to 30 μm, preferably about 1 to 20 μm. If it exceeds 30 μm, it becomes difficult for the solvent receiving layer to become transparent even if it receives a transparent solvent, and it becomes difficult for the printed portion to be visually recognized. On the other hand, if it is less than 1 μm, the acceptance of the solvent in the printed portion becomes insufficient, the solvent bleeds around the printed portion, and the printed portion is easily crushed.

The solvent-receiving layer formed from the above-mentioned polymer binder and pigment may contain additives such as a leveling agent, an ultraviolet absorber and an antioxidant, in addition to the pigment.

The above-mentioned solvent-accepting layer is prepared by dissolving or dispersing the above-mentioned resin alone or in a mixture with a necessary additive in an appropriate solvent to prepare a coating solution. It can be manufactured by applying the composition on a support by a known method such as a coating method, an air knife coating method, a spray coating method, and drying.
As a solvent, an organic solvent such as propylene glycol monomethyl ether, methylene glycol monomethyl ether, ethyl alcohol, methyl alcohol, or isopropyl alcohol or water is used.

The mat-like solvent-receiving layer on the surface of the recording material of the present invention is not formed by applying a coating solution containing a binder and a pigment as described above, but is formed by sandblasting the surface of a plastic sheet. It may be formed in a mat shape by a known matting method such as a chemical matting method.

Alternatively, the plastic sheet is immersed in a first solvent that is a good solvent for the resin (a solvent that dissolves the resin well), and then the plastic sheet is poorly solvented for the plastic sheet resin that is compatible with the good solvent. Solvent that hardly or substantially dissolves the resin)
By immersing in a second solvent, a fine joint (crack) may be formed on the surface of the plastic sheet to form a mat. Such joints are formed when the surface of the plastic sheet expands due to the good solvent and rapidly contracts due to the poor solvent. A method of forming such fine joints on the surface of a plastic sheet is disclosed in, for example,
No. 113835 and the like.

As the poor solvent for the solvent-soluble resin,
Examples thereof include hydrocarbon solvents such as aliphatic hydrocarbons, aromatic hydrocarbons, and terpene hydrocarbons, halogenated hydrocarbons, and alcohols. Examples of the good solvent for the solvent-soluble resin include acetone, methyl ethyl ketone, ketones such as cyclohexane, ethyl acetate, butyl acetate, esters such as ethylene glycol monomethyl ether acetate, and the like, or depending on the resin, aromatic hydrocarbon,
Alcohols are applicable. When a water-soluble resin is used, a poor solvent for a solvent-soluble resin becomes a good solvent, and a good solvent becomes a poor solvent.

The mat-like solvent receiving layer formed as described above preferably has a center line average roughness (JIS-B) of 0.1 to 3.0 μm, more preferably 0.2 to 2.0 μm.
0601, Ra). If the average roughness is too small, the solvent-receiving layer becomes nearly transparent, making it difficult to distinguish between the printed area and the non-printed area. On the other hand, if it is too large, it will be difficult to become transparent even when the solvent is received, the durability will be reduced, and the transportability in the printer will be poor.

Further, the solvent receiving layer of the recording material of the present invention may have a porous structure surface, receive the solvent through pores, and become transparent. In order to maintain such solvent receptivity, the pores of the solvent receptive layer must be open to the surface of the solvent receptive layer and be continuous in the thickness direction of the layer. In order for such pores to receive the solvent,
Depending on the degree of hydrophilicity of the resin forming the layer and the type of the solvent used, the pores usually have a pore diameter of about 0.01 to 5.0 μm, preferably about 1.0 to 5.0 μm.

Such continuous micropores are formed, for example, by dissolving the resin constituting the solvent receiving layer in a solvent and applying the resin in a solvent mixture of a good solvent and a poor solvent. By drying, it can be formed utilizing the difference in drying speed. In this case, drying temperature, drying air volume,
The diameter of the pores can be adjusted by changing the drying time, the mixing ratio of the good solvent and the poor solvent, and the like.

When a mixture of a good solvent and a poor solvent is used as a resin solvent as described above, a good solvent having a relatively low boiling point evaporates first. As the evaporation of the good solvent progresses, the resin phase in the coating liquid and the remaining poor solvent phase undergo phase separation, and the resin gels, while the poor solvent takes the form of particles dispersed in the resin. Become. When drying proceeds further, evaporation of the high boiling point poor solvent in the form of particles proceeds, and fine pores are formed.

Drying for forming such fine pores may be performed in one step, or first, low-temperature drying is performed to substantially complete evaporation of only a low-boiling point good solvent, and then remaining by high-temperature drying. Two-stage drying for evaporating the poor solvent may be performed. The drying conditions vary depending on the resin used, the type of good solvent and poor solvent, the desired pore size, etc., but generally in the case of one-stage drying, at 50 to 120 ° C. for 1 to 10 minutes, in the case of two-stage drying, First, dry at low temperature at 50-90 ° C.
The high-temperature drying is preferably performed at 90 to 120 ° C. for 1 to 3 minutes for 10 to 10 minutes. Further, the low-temperature drying in the two-stage drying is preferably performed under a windless condition.

As the resin for forming the solvent receiving layer when forming the fine pores as described above, nitrocellulose resin, acrylic resin, polyester resin, vinyl chloride /
A vinyl acetate copolymer resin, an acetal resin, a urethane resin, a styrene / acrylic acid copolymer resin, or the like is used.

The poor solvent and good solvent for the above resin can be selected from those mentioned above.

The solvent mixture is 1 to 1 part by weight based on 1 part by weight of the resin.
It is used in an amount of about 00 parts by weight. In the solvent mixture, the poor solvent is generally used in an amount of about 10 to 90% by weight, preferably about 20 to 80% by weight. As the above-mentioned good solvent and poor solvent, it is preferable to use a combination of a mutually soluble good solvent and poor solvent from the viewpoint of stable dispersion of the coating liquid.

The porous layer has a diameter of about 5 μm to 10 μm.
A coating film having coarse open pores of 0 μm, a so-called brushing film may be used. The brushing film can be formed by applying the resin solution and then drying in a humidity atmosphere of about 60 to 80%. Usually, the brushing film is a continuous cell in which about five bubbles continue from the surface layer.

The resin constituting the porous solvent-receiving layer having such open cells is also preferably hydrophilic like the polymer binder of the solvent-receiving layer containing the pigment. The resins mentioned as examples of the polymer binder of the solvent receiving layer containing

Further, by using a known method, a resin coating solution containing a foaming agent used for forming a plastic foam is applied and foamed to form micropores.

The above-mentioned porous solvent-receiving layer is formed by using the same coating method as that for the solvent-receiving layer composed of the above-mentioned polymer binder and pigment, except for the above specific conditions. be able to.

The solvent-receiving layer having a porous surface as described above may also contain additives such as a leveling agent, an ultraviolet absorber and an antioxidant.

When the solvent-receiving layer composed of a polymer binder and a pigment is formed as described above, the surface is mat-like and porous by adjusting the particle size of the pigment and the amount added to the polymer binder. It is also possible to form a solvent-receiving layer which is a material. Such a solvent receiving layer becomes transparent when the solvent is held in the concave portions and the pores of the mat-like surface. By using a porous pigment itself, it is possible to form a solvent receiving layer that is opaque when no solvent is present due to the presence of the mat-like surface and the porosity of the pigment. Such a solvent receiving layer becomes transparent by holding the solvent in the concave portions of the mat-like surface and in the pores of the pigment.

When a support is used to support the solvent-receiving layer of the recording material of the present invention, any material can be used without any particular limitation as long as it can achieve this object. Can be used.

For example, polyester, polyether sulfone, polycarbonate, polyethylene, polypropylene, poly (meth) acrylate, polyamide, polyvinyl chloride, acetylcellulose, and copolymers of monomers constituting these polymers with copolymerizable monomers, etc. And a plastic film or sheet made of the above material, paper, a glass plate, a metal sheet, or a sheet obtained by laminating a sheet of the above material. A polyester film or sheet is preferred in terms of heat resistance, mechanical strength, dimensional stability, cost, and the like.

The thickness of the support is not particularly limited as long as the recording material has a sufficient mechanical strength and thickness necessary for ink-jet printing, and varies depending on the material. When such a material is used, it is usually 20 μm to 100 μm, preferably 20 μm to 50 μm.
It is about μm.

Further, in the recording material of the present invention, a coloring layer may be provided below the solvent receiving layer. That is, when the solvent receiving layer is provided on the support, a colored layer can be provided on the surface of the support opposite to the surface on which the solvent receiving layer is provided or between the solvent receiving layer and the support. When a support is not used, a coloring layer can be provided on the side opposite to the printing surface of the solvent receiving layer. By providing such a colored layer, when the solvent receiving layer becomes transparent by receiving the solvent, the colored layer can be visually recognized through the solvent receiving layer and the support, and the opaque (usually cloudy) non-printed portion The printed portion can be more clearly recognized by the color contrast between the solvent receiving layer and the colored layer.

Such a colored layer is formed by using the above-mentioned materials suitable for the support and blending them with pigments and dyes, or a paint containing pigments and dyes thereon. And the like. Such a colored layer can be laminated on a support or the like by a known method such as using an adhesive or thermocompression bonding.

The thickness of the colored layer is not particularly limited either. When a support having the above-mentioned thickness is used,
The thickness can be about 30 μm, more preferably about 5 to 20 μm.

Further, the above-mentioned support can also serve as a colored layer. In this case, the support may be composed of a support in which pigments and dyes are blended so as to obtain a desired color, or a support coated with a paint containing pigments, dyes and the like.

The recording material of the present invention obtained as described above can be printed with a solvent-receiving layer as a printing surface by an ordinary inkjet printer. However, printing is performed using ink substantially consisting only of a volatile solvent so that the recording material can be used many times. Examples of such volatile solvents include, but are not limited to, water, alcohols such as methyl alcohol, ethyl alcohol, and glycerin, and glycols such as ethylene glycol. Additives such as preservatives and antifungal agents may be added to the solvent used as the ink. However, additives that remain in the solvent receiving layer even when the solvent evaporates are gradually recorded according to the present invention. Since the recording performance of the material is deteriorated, it is not preferable to add a very large amount.

By performing ink-jet printing using such a solvent as ink, the printed portion of the solvent-receiving layer of the recording material of the present invention becomes transparent and can be distinguished from the surrounding opaque non-printed portions, and the printing state can be confirmed. Can be. After printing, the recording material of the present invention returns to the same opaque state as before printing by quickly drying the solvent at a speed dependent on conditions such as the type of solvent used and the ambient temperature, and the same inkjet printing again It can be performed.

Incidentally, by adding a small amount of a solvent having a low volatilization rate such as cellosolve or anone to the above-mentioned solvent, the storage time of the printing portion can be adjusted as appropriate.

[0049]

The present invention will be further described with reference to the following examples.

Example 1 A transparent polyester film having a thickness of 100 μm was coated on one surface with a coating solution for a solvent-receiving layer having the following formulation using a Meyer bar, and then dried in a dryer at 60 ° C. for 5 minutes. Was 6 μm, and a porous layer having open pores having an average diameter of 2 μm was formed to obtain a recording material of the present invention. The surface of the solvent receiving layer had a cloudy appearance. Coating liquid for solvent receiving layer 10 parts by weight of nitrocellulose (HIG1 / 2, manufactured by Asahi Kasei Corporation) Acetone 67.5 parts by weight Xylene 22.5 parts by weight An ink jet printer (Seiko) was used for the solvent receiving layer of the obtained recording material. Epson Machjet 500C)
And printing was performed using water as an ink to obtain a printed material. The printed portion became transparent, the solvent did not bleed into the non-printed portion, the printed portion was clearly distinguishable from the clouded non-printed portion, and the printing state was confirmed. The printed portion did not spread even when rubbed with a fingertip.

When the above-described recording material after printing was left at room temperature for about 30 minutes, substantially all of the water on the recording material had evaporated, and the recording material was ready to be used for printing again.

Example 2 One side of a transparent polyester film having a thickness of 75 μm was coated with a solvent receiving layer coating solution having the following formulation using a Mayer bar.
It was dried at 0 ° C. for 10 minutes, and had a thickness of 8 μm and an average diameter of 0.1 μm.
A recording layer of the present invention was obtained by forming a solvent receiving layer on a porous surface having 8 μm open pores. The surface of the solvent receiving layer had a cloudy appearance. Coating liquid for solvent receiving layer Vinyl chloride / vinyl acetate resin 10 parts by weight (manufactured by Nippon Zeon Co., Ltd., 400 × 150S) Methyl ethyl ketone 65 parts by weight n-butanol 35 parts by weight The obtained recording material was treated in the same manner as in Example 1. Printing was performed. The printed portion became transparent, the solvent did not bleed into the non-printed portion, the printed portion was clearly distinguishable from the clouded non-printed portion, and the printing state was confirmed. The printed portion did not spread even when rubbed with a fingertip.

When the recording material after printing was left at room temperature for about 30 minutes, substantially all of the water on the recording material had evaporated, and the recording material was ready to be used for printing again.

Example 3 A coating liquid for a solvent receiving layer having the following formulation was applied to one surface of a 75 μm-thick polyester film using a Meyer bar, and dried at 60 ° C. for 10 minutes in a drier keeping the humidity at 80%. A recording material of the present invention having a brushing solvent receiving layer having a thickness of 50 μm and a bubble diameter of about 30 μm was obtained. The surface of the solvent receiving layer had a cloudy appearance. Coating solution for solvent receiving layer Styrene / acrylic resin 5 parts by weight (manufactured by BASF, EMU powder) Ethanol 50 parts by weight Acetone 45 parts by weight Printing was carried out on the obtained recording material in the same manner as in Example 1. The printed portion became transparent, the solvent did not bleed into the non-printed portion, the printed portion was clearly distinguishable from the clouded non-printed portion, and the printing state was confirmed. The printed portion did not spread even when rubbed with a fingertip.

When the recording material after printing was left at room temperature for about 30 minutes, substantially all of the water on the recording material had evaporated, and the recording material was ready to be used for printing again.

Example 4 One side of a transparent polyester film having a thickness of 75 μm was coated with a solvent receiving layer coating solution having the following formulation using a Mayer bar.
After drying at 00 ° C. for 3 minutes, the film thickness is 10 μm and Ra is 1.
A recording material of the present invention was obtained by forming a solvent receiving layer having a mat-like surface of 5 μm. The surface of the solvent receiving layer had a cloudy appearance. Coating liquid for solvent receiving layer 10 parts by weight of polyvinylpyrrolidone (K-90, manufactured by ISP) 5 parts by weight of porous silica (Mizukasil P78F, manufactured by Mizusawa Chemical Co., Ltd.) 135 parts by weight of methanol Recorded Printing was performed on the material in the same manner as in Example 1. The printed portion became transparent, the solvent did not bleed into the non-printed portion, the printed portion was clearly distinguishable from the clouded non-printed portion, and the printing state was confirmed. The printed portion did not spread even when rubbed with a fingertip.

When the recording material after printing was left at room temperature for about 30 minutes, substantially all of the water on the recording material had evaporated, and the recording material was ready to be used for printing again.

Example 5 A coating solution for a colored layer of the following formulation was applied to the surface of the polyester film opposite to the solvent receiving layer side of the recording material produced in Example 1 with a Mayer bar, and dried at 90 ° C. for 3 minutes. Thus, a recording material of the present invention having a solvent receiving layer on the porous surface and a colored layer having a thickness of 5 μm on the rear surface was obtained. The surface of the solvent receiving layer had a cloudy appearance. Coating solution for colored layer 10 parts by weight of polyester resin (byron # 200, manufactured by Toyobo Co., Ltd.) 5 parts by weight of colorant (ANP-C-903 black) 50 parts by weight of methyl ethyl ketone 50 parts by weight of toluene Printing was performed in the same manner as in Example 1. The printed portion became transparent, and the black color of the colored layer became recognizable, and could be clearly distinguished from the cloudy non-printed portion. The printed portion did not spread even when rubbed with a fingertip.

When the above-mentioned recording material after printing was left at room temperature for about 30 minutes, substantially all of the water on the recording material had evaporated, and the recording material was ready to be used for printing again.

Example 6 One side of a transparent polyester film having a thickness of 100 μm was
The same colored layer as in Example 5 was provided. Further, a porous solvent-receiving layer similar to that of Example 1 was formed on the colored layer, and a recording material of the present invention having a colored layer and a solvent-receiving layer in this order on one upper surface of a polyester film was obtained. The surface of the solvent receiving layer had a cloudy appearance.

When printing was performed on this recording material in the same manner as in Example 1, the printed portion became transparent, the black color of the colored layer became recognizable, and it was clearly distinguishable from the cloudy non-printed portion. The printed portion did not spread even when rubbed with a fingertip.

When the recording material after printing was left at room temperature for about 30 minutes, substantially all of the water on the recording material had evaporated, and the recording material was ready to be used for printing again.

Example 7 A porous solvent-accepting layer similar to that of Example 1 was formed on one surface of a commercially available black pigment-kneaded polyester film (Melinex 427 manufactured by ICI) to obtain a recording material of the present invention. The surface of the solvent receiving layer had a cloudy appearance.

When printing was performed on this recording material in the same manner as in Example 1, the printed portion became transparent, the black color of the polyester film became recognizable, and it could be clearly distinguished from the cloudy non-printed portion. The printed portion did not spread even when rubbed with a fingertip.

When the recording material after printing was left at room temperature for about 30 minutes, substantially all of the water on the recording material had evaporated, and the recording material was ready to be used for printing again.

Example 8 Using a 100 μm-thick transparent polyester film, a coating solution for a solvent-receiving layer having the following formulation was applied to one surface thereof with a Meyer bar, and then dried at 60 ° C. for 5 minutes in a drier. A recording material of the present invention was obtained by forming a solvent receiving layer on a porous surface having a thickness of 5 μm and an average diameter of 0.8 μm and having open pores. The surface of the solvent receiving layer had a cloudy appearance. Coating solution for solvent receiving layer 10 parts by weight of acetoacetyl group-modified polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., Gosefimer LL02) 30 parts by weight of methanol 70 parts by weight of butyl acetate Printer (Seiko Epson, MachJet 500C)
Was performed using methanol as an ink to obtain a printed matter. The printed portion became transparent, the solvent did not bleed into the non-printed portion, the printed portion was clearly distinguishable from the clouded non-printed portion, and the printing state was confirmed. The printed portion did not spread even when rubbed with a fingertip.

When the recording material after printing was left at room temperature for about 15 minutes, substantially all of the methanol on the recording material was volatilized, and the recording material was ready to be used for printing again.

[0068]

As can be seen from the above results, the recording material of the present invention can be repeatedly printed by ink jet printing, and the printing state can be confirmed. Therefore, the use of disposable recording materials such as paper can be greatly reduced.

Claims (4)

[Claims] 1. A recording material having a mat-like or porous surface and having a solvent receiving layer that is opaque when no solvent is present, but becomes transparent when the solvent is received. 2. The recording material according to claim 1, wherein the surface of the solvent receiving layer has a mat shape having a center line average roughness of 0.1 to 3.0 μm. 3. The surface of the solvent receiving layer has a diameter of 0.01 to 5.
The recording material according to claim 1, which has a porous structure having continuous pores of 0 µm. 4. The recording material according to claim 1, further comprising a coloring layer below the solvent receiving layer.