JPS62160276A - Material to be recorded - Google Patents

Abstract

PURPOSE:To enhance the close adhesiveness of an ink receiving layer and a base material, in a material to be recorded prepared by providing the ink receiving layer on the hydrophobic base material, by using the hydrophobic base material having specific surface roughness. CONSTITUTION:In a material to be recorded for ink jet recording prepared by providing an ink layer comprising a water-soluble hydrophilic polymer on a hydrophobic base material, especially, a transparent plastic film, if the surface roughness represented by Ra of the above-mentioned hydrophilic base material is set to 0.02mum or less in cut-off of 0.25mm, the close adhesiveness of the base material and the ink receiving layer can be enhanced. The surface roughness represented by Ra in this invention is center line average roughness defined in JIS B0601 and a value usually measured using a contact probe type roughness meter.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a recording material, particularly a recording material for inkjet recording, and more specifically to a recording material in which an ink-receiving layer is provided on a hydrophobic substrate such as a plastic film. The present invention relates to a recording material for inkjet recording that has improved adhesion between the base material and an ink-receiving layer.

(Prior Art) Inks used in inkjet recording methods are generally those in which water-soluble dyes are dissolved in a liquid medium mainly composed of water, polyhydric alcohol, etc. As the recording material, a water-absorbing or hydrophilic recording material such as paper is usually used.

On the other hand, in recent years, there has been an increasing demand for performing inkjet recording on a transparent plastic film and using the resulting recorded material as a document for an overhead projector. However, such transparent plastic films, such as polyester films, are generally hydrophobic and do not absorb water-based ink for inkjet recording, so when inkjet recording is performed, the ink dries extremely slowly, causing ink to run out and stains due to transfer. As a countermeasure against this problem, an ink-receiving layer is provided on a hydrophobic plastic film using a water-soluble to hydrophilic polyester.

(Problem to be solved by the invention) However, not only water-soluble to hydrophilic polymers but even organic solvent-soluble polymers have sufficient adhesion to hydrophobic plastic films, especially polyester films. In many cases, an ink-receiving layer cannot be obtained, resulting in problems such as the ink-receiving layer being easily peeled off from the substrate.

Therefore, the object of the present invention is to provide a recording material for inkjet recording in which an ink-receiving layer made of a water-soluble to hydrophilic polymer is provided on such a hydrophobic base material, particularly a transparent plastic film, and to improve the relationship between the ink-receiving layer and the base material. An object of the present invention is to provide a recording material with improved adhesion.

The present inventor has conducted intensive research to solve the problems of the prior art described above and to achieve the object of the present invention.

The adhesion between the hydrophobic base material and the ink-receiving layer made of water-soluble to hydrophilic polyester depends on the surface condition of the base material used.
The present invention was completed based on the knowledge that this would be greatly affected.

(Disclosure of the Invention) That is, the present invention provides a recording material in which an ink receiving layer is provided on a hydrophobic substrate, and the surface roughness expressed by Ra of the hydrophobic substrate has a cutoff of 0.25a+m. This is a recording material characterized by having a particle diameter of 0.02 μm or less.

In addition, the surface roughness expressed by Ra in the present invention is defined by JIS
This is the center line average roughness specified in BO601, and is a value usually measured using a stylus type roughness meter.

Next, to explain the present invention in more detail, as mentioned above, when forming an ink-receiving layer from a water-soluble to hydrophilic polymer on a hydrophobic base material, in many cases, the present inventor has found that the hydrophobicity of the base material Due to the wood-philicity of the polymer, the adhesion between the base material and the ink-receiving layer was insufficient, causing the problem of peeling. As a result of extensive research, we have found that such adhesion is greatly affected by the surface roughness of the hydrophobic base material used, and if the surface roughness value is below a certain value, the base material is hydrophobic. The present invention was completed based on the finding that a recording material having sufficient adhesion can be obtained even if the ink receiving layer is formed from a water-soluble to hydrophilic polymer.

The hydrophobic substrate used in the present invention and which mainly characterizes the present invention is generally preferably a transparent plastic film formed from a thermoplastic polymer,
Typical examples include polyester resins, diacetate resins, triacetate resins, acrylic resins, polycarbonate resins, and polyvinyl chloride resins.

Examples include films or plates made of polyimide resin, cellophane, celluloid, etc. It is also possible to use transparent substrates such as those described above that have been treated to become opaque by known means.

Such hydrophobic substrates generally have a thickness of 1 to 20
Such a hydrophobic base material itself, which is preferably one of 0 JLm, is conventionally known and easily available on the market, but in the present invention, the surface of at least one of these base materials It is necessary that the roughness is 0.027 tm or less at the value defined above.

According to the inventor's detailed research, the Ra value of the hydrophobic base material has a large effect on the adhesion with the ink receiving layer made of a water-soluble to hydrophilic polymer, and the smaller the Ra value, the better the adhesion. Furthermore, as the value of Ra increases, the adhesion of the ink-receiving layer decreases, and in the case of recording materials for inkjet recording, when the value of Ra is 0.02 μm or less, a sufficient base of the ink-receiving layer is obtained. Adhesion to the material is achieved.

It has been found that even more satisfactory adhesion can be achieved when the value of Ra is further reduced to 0,01)Lm or less.

As mentioned above, although the theoretical relationship between the adhesion of the ink-receiving layer to the hydrophobic substrate and the Ra value is not necessarily fully clarified, according to the inventor's speculation, it is usually the case that the ink-receiving layer has high transparency and low Ra value. Plastic films with rough surfaces are prone to scratches on the surface during film production, so as a countermeasure, additives are sometimes added to the raw materials to prevent scratches on the film surface, and as a result, It is also believed that this leads to improvement in the adhesion of the ink-receiving layer made of a water-soluble to hydrophilic polymer to the base material.

Since the recording material of the present invention as described above has significantly improved adhesion between the base material and the ink receiving layer, many of the problems of the prior art have been solved. In addition, when a transparent base material is used as the base material and the ink-receiving layer is also formed transparent, the surface roughness is small, so transparency is high, and haze is low and an excellent transparent cover is formed. Recording material is obtained.

The recording material of the present invention is obtained by forming an ink-receiving layer from a water-soluble to hydrophilic polymer on a large material having a specific surface roughness such as Kitaki. Preferred polymers include albumin, gelatin, casein, starch, cationic starch, gum arabic,
Natural resins such as sodium alginate, polyvinyl alcohol, ion-modified polyvinyl alcohol, polyvinylpyrrolidone, polyamide, polyacrylamide, quaternized polyvinylpyrrolidone, polyethyleneimine, polyvinylpyricillium halide, melamine resin, polyurethane, polyester, sodium polyacrylate, etc. Synthetic resins include, and one or more of these materials may be used in combination if desired.

In the present invention, an ink-receiving layer is formed on the above-mentioned specific large material from a water-soluble to hydrophilic polymer as described above, and while maintaining the excellent ink-absorbing property of the ink-receiving layer, further excellent water resistance and In order to improve blocking resistance and the like, it is preferable to form the ink-receiving layer from a wood-philic and water-insoluble polymer.

Examples of such hydrophilic and water-insoluble polymers include crosslinked products of water-soluble to hydrophilic polymers as described above, but particularly preferred are basic water-soluble to hydrophilic polymers and acidic water-soluble polymers. - Polymer complexes obtained from hydrophilic polymers.

In the present invention, preferred basic polymers include, for example, the following.

N-vinylpyrrolidone, N-vinyl-3-methylpyrrolidone, N-vinyl-5-methylpyrrolidone, N-vinyl-3,3,5-trimethylpyrrolidone, N-vinyl-3
-Benzylpyrrolidone, N-vinylpiperidone, N-vinyl-4-methylpiperidone, N-vinyl-caprolactam, N-vinylcapryllactam, N-vinyl-3-
Morpholine, N-vinylthiopyrrolidone, N-vinyl-
Homopolymers such as 2-pyridone or random copolymers, block copolymers, graft copolymers, etc. with other common monomers; N-vinyl-2-oxazolidone, N-vinyl-5-methyl-2 -Oxazolidone, N-vinyl-5-ethyl-
2-oxacylidone, N-vinyl-4-methyl-2-oxazolidone, N-vinyl-2-thioxazolidone,
Homopolymers such as N-vinyl-2-mercaptobenzothiazole or random copolymers with other common monomers, block copolymers, graft copolymers, etc.; N-vinylimidazole, N-vinyl-2- Homopolymers of methylimidazole, N-vinyl-4-methylimidazole, etc., or random copolymers, block copolymers, graft copolymers, etc. with other common 7-mers; 2- or 4-vinylpyridine Other copolymerizable polymers that may be used in the above include homopolymers such as, random copolymers, block copolymers, graft copolymers, etc. with other common monomers. Methacrylate, acrylate, acrylamide, acrylonitrile, vinyl ether, vinyl acetate, vinyl imidazole,
Such as ethylene, styrene and other common hexamers.

Particularly useful in the present invention are N-vinylpyrrolidone, N-vinylpiperidone, N-vinylcaprolactam, N-vinylmorpholine, N-vinyl-2-oxacylidone, and N-vinyl-5-methyl-2-oxacylidone. These include combinations, copolymers, etc. In the case of copolymers,
It is preferable that 50 mol% or more of the nitrogen-containing monomers mentioned above are included.

In addition, an acidic polymer that can form a polymer complex with the above basic polymer (in the present invention, the term "acidic polymer" refers to a sulfonic acid group, a carboxylic acid group, a sulfuric acid ester group, a phosphoric acid ester group, or a phenolic acid group in its molecule). In addition to those having a hydroxyl group, the examples also include those having an alcoholic hydroxyl group.) include, for example, the following.

1. Polymer with carboxylic acid group Terminal carboxyl obtained by reacting a polyhydric carboxylic acid such as citric acid, tartaric acid, phthalic acid, etc. with a polyhydric alcohol such as ethylene glycol, 1,4 butanediol, diethylene glycol in excess of acid. Base polyester: Acidic cellulose derivative modified with various polyhydric carboxylic acids (
Homopolymers such as vinyl ether ester monomers of polyvalent carboxylic acids, random copolymers, block copolymers, graft copolymers, etc. with other common monomers (see Japanese Patent Publication No. 35-5093); 35-8495
(Refer to the publication No. 2002-12-13); A heptamer homopolymer such as acrylic acid or methacrylic acid or a random copolymer with other common monomers,
Block copolymers, graft copolymers, etc. Homopolymers of α,β-unsaturated vinyl monomers such as maleic anhydride and itaconic acid, or random copolymers and block copolymers with other common monomers , graft copolymers, etc. (Citrus, Bengami, Tani eds., Synthetic polymer (III) P,
250-257 and P, 374-380, Breakfast Bookstore (
1971); 2. Polymers with sulfonic acid groups 0-Ethylcellulose hydrogen phosphate hydrogen sulfate phthalate, cellulose hydrogen acetate hydrogen sulfate phthalate, ethylcellulose hydrogen-〇-sulfobenzoate ester, 0-P-sulfonebenzyl cellulose Acetate ester, 0-ethyl-
〇-Cellulose derivatives such as P-sulfoethyl cellulose acetate (see Japanese Patent Publication No. 35-5093)
: Sulfonic acid compound of polyvinyl alcohol or vinyl alcohol copolymer (e.g. O-sulfobenzoic acid,
Sulfonic acid-modified polymers with sulfopropionic acid, sulfovaleric acid, sulfobenzaldehyde, sulfophthalic acid, etc.): 3. Polymers with hydroxyl groups, ethyl cellulose, benzyl cellulose, hydroxyethyl cellulose, hydroxyethyl/ethyl cellulose, hydroxyethyl/benzyl cellulose, etc.; Others Homopolymers of monomers containing sulfonic acid or phenol groups, or random copolymers, block copolymers, graft copolymers, etc. with other common monomers; Other compounds containing carboxyl groups, sulfonic acid groups, or phenol groups Acidic modified products of various polymers; All of the above acidic polymers can be used, but particularly preferred in the present invention are homopolymers, random copolymers, and block copolymers of α,β-unsaturated acids. These include copolymers and graft copolymers, and particularly preferred are copolymers of alkyl vinyl ether and maleic anhydride.

The present inventor has been conducting various research on mixtures of basic polymers and acidic polymers as described above, and found that
By mixing these polymers in a solution, both polymers interact in some way to form a polymer complex that is different from either polymer,
If both polymers are mixed in a relatively good solvent, a polymer complex will precipitate, and if mixed in a relatively good solvent, a significant increase in viscosity will occur, resulting in properties different from those of a simple mixture of both polymers used. I found something that was soothing.

Therefore, the polymer complex used in the present invention means a polymer complex made of the above-mentioned polymers (details of basic polymers, acidic polymers, and polymer complexes made of these polymers can be found in Japanese Patent Publication No. 51-37017). (Please refer to Japanese Patent Publication No. 55-42744).

The present inventor further conducted various studies on the uses of these polymer complexes, and found that although these polymer complexes are extremely hydrophilic, they do not have water resistance,
It is moisture resistant, and when used to form the ink-receptive layer of inkjet recording materials, it showed ink-receptivity equivalent to that of conventional water-soluble polymers, giving clear images, and its surface remained stable even under high humidity conditions. It was discovered that this did not cause any stickiness.

As mentioned above, polymer complexes generally contain water,
Since it does not dissolve in relatively poor solvents such as alcohols, esters, hydrocarbons, etc., the polymer complex used in the present invention can be prepared by dissolving both polymers in these poor solvents and mixing both solutions. Can be isolated. Alternatively, a solution of the polymer complex can be obtained by mixing in a relatively good solvent such as dimethylformamide, dimethylacetamide, dimethylsulfoxide, or the like.

Preferred basic polymers and acidic polymers for forming the above polymer complexes each have a molecular weight of 500 or more, preferably 1,000 or more, and by using both polymers with these molecular weights, It is possible to form an ink-receiving layer that has high strength, excellent clarity of ink-receptive single images, and excellent water resistance.

Furthermore, the ratio of both polymers used is in a range such that the weight ratio of basic polymer/acidic polymer is 20/l to 1/10, and preferably the ratio is such that the basicity and acidity of each polymer are approximately equal. It is. If the weight ratio deviates from the above range, the bond between both polymers will be insufficient and the object of the present invention will not be fully achieved. That is, if the basic polymer is too large, the water resistance will be reduced, and if the acidic polymer is too large, the ink receptivity will be reduced.

The ink-receiving layer of the recording material of the present invention is formed using one or more water-soluble to hydrophilic polymers, preferably the above polymer complex, but these polymers can also be used as a mixture of two or more. Of course.

Furthermore, in order to reinforce the strength of the ink-receiving 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,
Hydrophobic resins such as phenol resins and alkyd resins may be used in combination.

In addition, in order to improve the ink absorbency of the ink receiving layer, various fillers such as silica, clay, etc. are added to the ink receiving layer.
Fillers such as talc, diatomaceous earth, calcium carbonate, sulfur-resistant calcium, barium sulfate, aluminum silicate, synthetic zeolite, alumina, zinc oxide, lithopone, satin white, and the like can also be dispersed in the ink-receiving layer. However, if a highly transparent recording material is desired, the above-mentioned filler should be used to the extent that it does not impair the transparency of the recording material.

As a method for forming such an ink-receiving layer, a coating liquid is prepared by dissolving or dispersing the above-mentioned polymer alone or a mixture in a suitable solvent, and the coating liquid is applied, for example, by a roll coating method or a lot bar coating method. It is preferable to use a known method such as a coating method, a spray coating method, an air knife coating method, etc. (a method in which the material is coated on the material and then quickly dried. When using a polymer complex, a basic polymer or an acidic polymer is used. It is also possible to apply one of the above solutions and then apply the other solution to form a polymer complex on the lumber, or hot melt coating the above polymer or polymer complex or the above materials. Other methods may also be used, such as forming a single film for the ink-receiving layer and then laminating the film to the above-mentioned base material.

Due to the characteristics of the polymer complex, it is necessary to use a solvent with a stronger dissolving power than to dissolve each of the polymer complexes, which allows the polymer complex to penetrate more strongly into the hydrophobic substrate used in the present invention and to be dissolved due to the synergistic effect of the polymer complexes. , exhibits particularly strong adhesion.

The thickness of the ink receiving layer obtained as described above is usually 0.
．． It is about 5 to 1100 JL, preferably about 1 to 50 μm, more preferably about 3 to 30 μm.

A preferred embodiment of the recording material of the present invention formed as described above is a translucent recording material having sufficient translucency.

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

If the in-line transmittance is 2% or more, it is possible to project the recorded image onto a screen and observe it using an OHP, and furthermore, in order to clearly observe the details of the recorded image,
It is desirable that the in-line transmittance is 10% or more.

The linear transmittance T (%) here refers to the incident perpendicular to the sample, transmitted through the sample, and at least 8
The spectral transmittance of the straight light that passes through the light-receiving side slit on the extension line of the incident optical path separated by c+s or more and is received by the detector is 1. The Y value of the tristimulus value of the color is determined from the measured spectral transmittance, and is determined by the following equation.

T value Y/Y, An integrating sphere is placed behind the sample to determine transmittance including diffused light.) and 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.

Since the behavior of straight-line light is a problem with devices that use optical technology, it is important to evaluate the straight-line transmittance of the recording material when evaluating the translucency of the recording material to be used in these devices. Asking is especially important.

For example, when observing a projected image on an OHP, in order to obtain an image that is easy to see with 1g brightness and high contrast between recorded and non-recorded areas, the non-recorded areas in the projected image must be bright;
That is, the in-line transmittance of the recording material is required to be at a certain level or higher. In an OHP test chart test, in order to obtain an image suitable for the above purpose, the linear transmittance of the recording material is 2% or more, and in order to obtain a clearer image, it is preferably 105 or more. That is required. Therefore, a recording material suitable for this purpose must have an in-line transmittance of 2% or more.

Further, when the recording material of the present invention is in an opaque embodiment, an opaque material may be used as the base material, or an opaque ink receiving layer may be formed.

Further, in the present invention, fine organic or inorganic powder is applied to the recording surface of the recording materials of various embodiments as described above at a rate of about 0.01 to about 1.0 g/rn'. By doing so, it is possible to further improve the transportability in the printer, the blocking resistance during stacking, the fingerprint resistance, etc. of the obtained recording material.

The present invention has been described above by exemplifying typical aspects of the recording material of the present invention, but of course the recording material of the present invention is not limited to these aspects. In addition, in any embodiment, the ink receiving layer contains a dispersant, fluorescent dye, p
H:A Various known additives such as a moderator, an antifoaming agent, a lubricant, a preservative, a surfactant, etc. can be included.

Note that the recording material of the present invention does not necessarily have to be colorless, and may be a colored recording material.

The recording material of the present invention as described above has excellent adhesion between the base material and the ink-receiving layer, and various problems caused by poor adhesion in the prior art have been solved.

In particular, embodiments in which the ink-receiving layer is formed of a wood-philic and water-insoluble polymer such as a polymer complex exhibit excellent ink receptivity and excellent sharpness similar to those in which the ink-receiving layer is formed of a conventional water-soluble polymer. It provides a clear recorded image, and its surface does not become sticky or sticky even under high humidity conditions.

Therefore, when recording not only monochrome images but also full-color images, even if ink of different colors repeatedly adheres to the same location within a short period of time, there is no ink flow or seepage phenomenon, and high-resolution, clear recorded images can be obtained. is obtained.

The excellent effect under such high humidity conditions is due to the fact that the two types of polymers used to form the ink-receiving layer have strong bonds between their molecules, such as interionic electrostatic force, hydrogen bonding, van der's bond, etc.
It is thought that some kind of weak bond occurs due to Waalska, partial movement of electric charges, etc., forming a polymer complex, which shows excellent water resistance even under high humidity conditions while maintaining high ink receptivity.

Therefore, the recording material of the present invention can be used not only as a recording material for surface image observation, but also as a recording material used for observation by projecting a recorded image onto a screen etc. using an optical device such as a slide or OHP, and a positive plate for color printing. It can be applied to uses other than conventional surface image observation, such as color separation plates during production or CMF used in color displays such as liquid crystals.

Hereinafter, the present invention will be explained in more detail according to Examples. In addition, parts in the text are based on weight unless otherwise specified.

Example 1 10% aqueous solution of polyvinylpyrrolidone (PVPK-90
, manufactured by CMF) and 66 parts of methyl vinyl ether/maleic anhydride copolymer (GANTREZ AN-189, CM
34 parts of a 10% aqueous solution (manufactured by F. Co., Ltd.) were mixed. The mixed solution gels to form a polymer complex, and 100 parts of N,N-dimethylformamide is added to this mixed solution to form a polymer complex.
When heated to 0°C, it becomes a solution, which is used as a coating liquid.

As a transparent base material, a polyethylene terephthalate film (Toshi Lumirror 077, Ra=0.
A coating solution with the above composition was applied onto this film using a bar coater method so that the film thickness after drying was 81 parts m, and then coated at 80'0 for 10 minutes. The material was dried under the following conditions to obtain a translucent recording material of the present invention.

The thus obtained recording material of the present invention was colorless and transparent.

Examples 2 to 5 A coating solution was prepared in the same manner as in Example 1 using the following composition, and an ink receiving layer was provided on the same polyethylene terephthalate film as in Example 1 in the same manner as in Example 1. , four types of translucent recording materials of the present invention and three types of recording materials for comparison were obtained.

L upper body” Polyvinylpyrrolid y (PVPK-90, made by CMF)
(10% aqueous solution) 66 parts methyl vinyl ether/maleic anhydride monoethyl ester copolymer (GANTREZ ES425, manufactured by CMF)
<Diluted in 10% ethanol solution> 34 parts backing 1" Polyvinyl vinyl = I IJ ton (PVPK-1110,
Made by CMF) (10% aqueous solution) 75
Part inbutylene/maleic anhydride copolymer (isopane
O, manufactured by Kuraray Soprene) (10% DMF solution> 25 parts direct weight)
Polyvinylpyrrolidone/vinyl acetate copolymer (Rubisco/l
/ 73E, Yuka Huff'ish) (diluted to 5% ethanol solution) 50 parts hydroxyethyl cellulose (HECAG-15, Fuji Chemical) (5)
% ethanol solution) 50 parts Comparative Examples 1 to 5 A polyethylene terephthalate film (East Lumirror T type, thickness loo μm, made from scratch) with an Ra of 0.025 JLm was used as the transparent substrate, and the other examples were Examples 1 to 5. A recording material for comparison was obtained in the same manner as described above.

Usage Example For the recording materials of the above Examples and Comparative Examples, the following 4
On-demand inkjet recording head that uses seed ink to eject ink using a piezoelectric vibrator (discharge orifice diameter 60 lm, piezoelectric vibrator drive voltage 70V)
, frequency 2 KHz).

2 parts (composition) C, 1, Direct Yellow 86 2 parts diethylene glycol 20 parts polyethylene glycol #200 1 (> part water
More than 70 copies! (Composition) C, 1, Acid Red 35 2 parts diethylene glycol 20 parts polyethylene glycol #200 10 parts water
70 parts Li21 (composition) C, 1, Direct Blue 86 2 parts diethylene glycol 20 parts polyethylene glycol #200 10 parts water
70 parts Ri ink (composition) C, 1, food black 2 2 parts diethylene glycol 20 parts polyethylene glycol #200 10 parts water
70 copies The evaluation results of the recording materials of Examples and Comparative Examples are shown in Tables 1 and 2.

Each evaluation item in Tables 1 and 2 was measured according to the following method.

(1) Ink fixation time is determined by leaving the recording material after recording at room temperature (20°C, 65% RH) and touching the recorded image with your finger, the ink will dry and will no longer stick to your finger. The time was measured.

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

(3) OHP suitability was measured as a representative example of optical equipment, and the recorded image was projected onto a screen using OHP.
Judging by visual observation, the non-recorded area is bright, the OD (optical density) of the recorded image is high, and a clear and easy-to-see projection image with high contrast is obtained. O1 The non-recorded area is slightly dark and the recorded image If the OD of the image is rather low and the line with a pitch width of 0.5ff1m and a thickness of 0.25a+m cannot be clearly distinguished, Δ, the non-recorded area is quite dark, the OD of the recorded image is quite low, the pitch width is 1mm, and the thickness is 0. .Those in which the 3 mm line could not be clearly distinguished or in which the non-recorded area and the recorded image were indistinguishable were marked as x.

(4) Linear transmittance was measured using a 323-type Hitachi self-recording spectrophotometer (manufactured by Hitachi, Ltd.), keeping the distance from the sample to the light-receiving side at approximately 9 cm, and measuring the spectral transmittance as described in (1) above. ) was calculated using the formula.

(5) Machine runability is measured under the conditions of 35°C and 85% RH, when the recording material is loaded into the printer, the printer's feed roller cannot run due to the stickiness of the surface of the ink-receiving layer. Items that could not be evaluated were marked with an x, and items that were not were marked with an O.

(6) Regarding the formation of a polymer complex, when the respective solutions of basic polymer and acidic polymer were mixed, those in which there was a sudden increase in viscosity or the formation of gel were marked as O, and those in which no gel was formed were marked as ×.

(7) Adhesion of the ink-receiving layer was determined by making a cross-shaped scratch on the ink-receiving layer-coated surface of the recording material to a depth that reached the base material, and then performing a peeling test on the scratched portion with cellophane tape. At this time,
Those in which the ink-receiving layer and the base material did not peel off were rated O1, and those in which the ink-receiving layer and the base material were peeled off were rated as ×.

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Claims (5)

[Claims] (1) In a recording material formed by providing an ink-receiving layer on a hydrophobic base material, the surface roughness expressed by Ra of the hydrophobic base material is 0.02 μm or less at a cutoff of 0.25 mm. A recording material characterized by: (2) The surface roughness expressed by Ra of the hydrophobic base material is 0.0
The recording material according to claim (1), which has a diameter of 1 μm or less. (3) The recording material according to claim (1), wherein the hydrophobic substrate is a plastic film, and the ink receiving layer is formed from a solution of a water-soluble to hydrophilic polymer. (4) The recording material according to claim (1), wherein the ink receiving layer is formed from a polymer complex. (5) The recording material according to claim (1), wherein the hydrophobic substrate is a transparent plastic film.