JPH0669753B2 - Recording material for inkjet - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording material suitably used in an inkjet recording method, and particularly to a recording material excellent in ink acceptability, recorded image sharpness and water resistance. Regarding

(Prior Art) Ink jet recording methods include various ink (recording liquid) ejection methods, such as an electrostatic suction method, a method in which a piezoelectric element is used to mechanically vibrate or displace ink, and ink is heated to foam. By the method of utilizing the pressure, etc., small droplets of ink are generated and ejected, and some or all of them are attached to a recording material such as paper for recording, but there is little noise generation. It has attracted attention as a recording method that enables high-speed printing and multicolor printing.

As the ink for inkjet recording, those mainly containing water are used in terms of safety and recording characteristics, and polyhydric alcohol or the like is added to prevent nozzle clogging and improve ejection stability. There are many cases.

As a recording material used in this ink jet recording method, conventionally, a recording material obtained by providing a porous ink receiving layer on a base material called ordinary paper or ink jet recording paper has been used.

However, with the improvement and spread of the performance of ink jet recording apparatuses such as high-speed recording or multi-color recording, more advanced and wide-ranging characteristics are required for recording materials.

That is, as a recording material for inkjet recording for obtaining a high-resolution and high-quality recorded image, (1) the ink can be received by the recording material as quickly as possible, and (2) the ink dots are Even if they overlap, the ink deposited later does not flow into the dots deposited before, (3) The ink droplets do not spread on the recording material, and the diameter of the ink dot does not become larger than necessary. (4) Basically, the shape of the ink dot is close to a perfect circle and the circumference is smooth, (5) The OD (optical density) of the ink dot is high and the area around the dot is not blurred, etc. Needs to be met.

Further, in order to obtain a high-resolution recording image quality comparable to that of a color photograph by the multicolor inkjet recording method, in addition to the above required performance, (6) the coloring component of the ink coloring component is excellent, 7) The ink fixability is particularly excellent because the same number of ink droplets as the number of ink colors may adhere to the same place, and (8) the surface is glossy. (9) Whiteness It is required to be weighted with high performance.

Further, a recorded image by the inkjet recording method has been conventionally used exclusively for observing a surface image, but with the improvement and spread of the performance of an inkjet recording apparatus, a recording material suitable for a purpose other than observing a surface image. Is being demanded.

Other than the surface image observation, the recording material is used to project recorded images on a screen or the like with an optical device such as a slide or an OHP (overhead projector) and observe those images. Examples include a color separation plate for making a positive plate and a CMF (color mosaic filter) used for a color display such as liquid crystal.

When the recording material is used for surface image observation, diffused light of the recorded image is mainly observed, whereas in the recorded material for these applications, transmitted light of the recorded image is a problem. Become. Therefore, it is required that the light-transmitting property, particularly the linear light-transmitting property, is excellent in consideration of the required performance of the above-mentioned general recording material for inkjet recording.

(Problems to be Solved by the Invention) However, the fact is that a recording material satisfying all of these required performances is not yet known.

Further, many conventional recording materials for surface image observation use a method in which a porous ink-receiving layer is provided on the surface and ink is received in the porous voids to fix the recording agent. The surface of the recording material was not glossy because of its good properties.

On the other hand, when the surface of the ink receiving layer is non-porous, non-volatile components such as polyhydric alcohol in the ink after recording remains on the surface of the recording material for a long time, and the drying and fixing time of the ink is long. When the recorded image is brought into contact with the clothes, there is a defect that the clothes are stained or the recorded image is damaged.

In addition, in the case of a recording material that uses a water-soluble polymer for forming the ink receiving layer in order to enhance the affinity with the ink and the ink receiving property, the surface of the ink receiving layer is tacky under high humidity conditions. Therefore, there is a problem that the recording material cannot be conveyed when attached to a printer feed roller or the like when mounted on the printer, and the recording material is blocked when stacked.

Therefore, an object of the present invention is to provide a recording material for ink jet recording which is particularly excellent in ink receptivity, water resistance and sharpness of recorded images. Another object of the present invention is to
It is an object of the present invention to provide a recording material for full-color inkjet recording which is excellent in ink receptivity, sharpness of a recorded image, surface gloss and does not cause surface stickiness or blocking even under high humidity conditions.

Another object of the present invention is to use a recorded image for observation by projecting it on a screen or the like with an optical device such as a slide or OHP, a color separation plate when creating a positive plate for color printing, or a color such as liquid crystal. CMF used for display
Another object of the present invention is to provide a recording material for inkjet recording, which can be used for observation of transmitted light.

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

DISCLOSURE OF THE INVENTION That is, according to the present invention, in an ink jet recording material in which an ink receiving layer is provided on a substrate, the ink receiving layer is mainly composed of a polymer complex of a basic polymer and an acidic polymer. The weight ratio of the both polymers forming the polymer complex is
(Basic polymer / acidic polymer) = 0.1 to 20, and the entire recording material is translucent, which is an inkjet recording material.

Explaining the present invention in detail, the recording material of the present invention is mainly characterized in that the ink receiving layer is composed of a polymer complex of a basic polymer and an acidic polymer, and mainly the purpose of the present invention is achieved thereby. It is something.

The recording material of the present invention generally comprises a base material as a support and a recording surface provided on the surface thereof, that is, an ink receiving layer. For example, (1) the base material and the ink receiving layer are particularly preferable embodiments. All of these are translucent and the entire recording material is translucent, and (2) the surface of the ink receiving layer is smooth and glossy.

Further, each of the ink receiving layers may have a function as a support at the same time.

The present invention will be described in more detail by taking some of the preferred embodiments described above as representative examples.

The polymer complex mainly characterizing the present invention is composed of a basic polymer and an acidic polymer. For example, JP-B-51-37017 and JP-B-55-4.
It is already known per se in the 2744 publication.

In the present invention, preferable basic polymers include, for example, the followings.

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-2
-Homopolymers such as pyridone or random copolymers with other common monomers, block copolymers, graft copolymers, etc .; N-vinyl-2-oxazolidone, N-vinyl-5-methyl-2- Oxazolidone, N-vinyl-5-ethyl-
2-oxazolidone, N-vinyl-4-methyl-2-oxazolidone, N-vinyl-2-thiooxazolidone,
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 such as methylimidazole and N-vinyl-4-methylimidazole, or random copolymers with other common monomers, block copolymers, graft copolymers, etc .; 2- or 4-vinylpyridine, etc. Random copolymers with homopolymers or other general monomers, block copolymers, graft copolymers and the like. Other copolymer monomers that may be used in the above are methacrylate, acrylate, Acrylamide, acrylonitrile, vinyl ether, vinyl acetate, vinyl imidazole, ethylene, styrene and its A common monomers such, particularly useful in the present invention, N- vinylpyrrolidone, N- vinyl piperidone, N- vinyl caprolactam, N- vinyl morpholine, N- vinyl-2-
-Oxazolidone and N-vinyl-5-methyl-2-oxazolidone homopolymers and copolymers. In the case of a copolymer, it is preferable that the above-mentioned nitrogen-containing monomer is contained in an amount of 50 mol% or more.

In addition, an acidic polymer capable of forming a polymer complex with the above-mentioned basic polymer (the “acidic polymer” in the present invention means a sulfonic acid group, a carboxylic acid group, a sulfuric acid ester group, a phosphoric acid ester group, a phenolic acid group in the molecule). Examples of those having a hydroxyl group include the following.

1. Polymers having carboxylic acid groups Terminal carboxyls obtained by reacting polyvalent carboxylic acids such as citric acid, tartaric acid and phthalic acid with polyhydric alcohols such as ethylene glycol, 1,4-butanediol and diethylene glycol in excess of acid -Based polyesters; acidic cellulose derivatives modified with various polyvalent carboxylic acids (see Japanese Patent Publication No. 35-5093); homopolymers such as vinyl ether ester monomers of polyvalent carboxylic acids or random copolymerization with other general monomers Polymers, block copolymers, graft copolymers, etc. (see Japanese Patent Publication No. 35-8495); homopolymers of monomers such as acrylic acid or methacrylic acid, or random copolymers with other general monomers,
Block copolymers, graft copolymers, etc .; Homopolymers such as maleic anhydride, itaconic acid, etc. α, β-unsaturated vinyl monomers, etc. or random copolymers with other common monomers, block copolymers , Graft copolymers (Murahashi, Inoue, Tani, Synthetic Polymer (III) P.250〜
257 and P.374 to 380, Asakura Shoten (1971)); 2. Polymers having sulfonic acid group O-ethyl cellulose hydrogen hydrogen sulfate phthalate ester, cellulose hydrogen hydrogen sulfate hydrogen phthalate, ethyl cellulose hydrogen hydrogen O-sulfobenzoate Acid ester, O-P-sulfone benzyl cellulose acetate, O-ethyl,
Cellulose derivatives such as OP-sulfoethyl cellulose acetate (see JP-B-355093); polyvinyl alcohol or vinyl alcohol copolymer sulfonic acid compounds (for example, O-sulfobenzoic acid, sulfopropionic acid, sulfo) Sulfonic acid-modified polymers with valeric acid, sulfobenzaldehyde, sulfophthalic acid, etc .; Homopolymers of other sulfonic acid or phenol group-containing monomers, or random copolymers and block copolymers with other general monomers , Graft copolymers, etc .; acidic modified products of various polymers with other carboxyl group-, sulfonic acid group-, or phenol group-containing compounds; any of the above-mentioned acidic polymers can be used. Polymerization of α, β-unsaturated acids A random copolymer, a block copolymer, a graft copolymer, particularly preferred are copolymers of alkyl vinyl ethers and maleic anhydride.

The present inventor has been variously researching a mixture of a basic polymer and an acidic polymer as described above,
By mixing these polymers in solution, both polymers interact with each other to form a polymer complex different from either polymer,
If both polymers are mixed in a relatively poor solvent, a polymer complex will be precipitated, and if mixed in a relatively good solvent, a remarkable increase in viscosity will occur, resulting in properties different from the simple mixture of both polymers used. I found that I had it.

Therefore, the polymer complex used in the present invention means a polymer complex composed of the above-mentioned polymers (details of the basic polymer, the acidic polymer and the polymer complex composed of these polymers are described in JP-B-51-37017). See Japanese Patent Publication No. 55-42744.

The present inventor further conducted various studies on the use of these polymer complexes, and although these polymer complexes were extremely hydrophilic, water resistance,
Moisture resistance, when used to form the ink receiving layer of a recording material for inkjet, it shows the same ink receiving property as a conventional water-soluble polymer and gives a clear image.
The inventors have found that the surface thereof does not become tacky even under high humidity conditions.

As described above, the polymer complex generally contains water,
Since it is insoluble in relatively poor solvents such as alcohols, esters, hydrocarbons, etc., both polymers are dissolved in these poor solvents, respectively, and both solutions are mixed to prepare a polymer complex used in the present invention. It can be isolated. Further, a solution of the polymer complex can be obtained by mixing in a relatively good solvent such as dimethylformamide, dimethylacetamide, dimethylsulfoxide and the like.

The basic polymer and acidic polymer preferable for forming the polymer complex as described above have a molecular weight of 500 or more, preferably 1,000 or more, and by using both polymers having these molecular weights, the strength is increased. It is possible to form an ink receiving layer which is large and has excellent ink receiving properties, image clarity, and water resistance.

The ratio of both polymers to be used is such that the weight ratio of basic polymer / acidic polymer is 20/1 to 1/10, and preferably the basicity and acidity of each polymer are approximately equal. Is. When the weight ratio is out of the above range, the bond between the two polymers becomes insufficient, and the object of the present invention cannot be achieved sufficiently. That is, if the amount of the basic polymer is too large, the water resistance will decrease, and if the amount of the acidic polymer is too large, the ink receiving property will decrease.

The ink receiving layer of the recording material of the present invention is formed by using the polymer complex as described above. In the present invention, in addition to the polymer complex as described above, for example, another translucent polymer is used as described above. You may use it together with a polymer complex.

Preferred as such other polymers are albumin, gelatin, casein, starch, cationic starch, gum arabic, natural resins such as sodium alginate, polyvinyl alcohol, polyamide, polyacrylamide, quaternized polyvinylpyrrolidone, polyethyleneimine, polyvinyl. Examples include synthetic resins such as pyridium halides, melamine resins, polyurethanes, polyesters, and sodium polyacrylate, and one or more of these materials may be used in combination if desired.

Further, in order to reinforce the strength of the ink receiving layer and / or improve the adhesion to the substrate, SBR latex, NBR latex, polyvinyl formal, polymethyl methacrylate, polyvinyl butyral, polyacrylonitrile, polyvinyl chloride are added as necessary. , Polyvinyl acetate, phenol resin, alkyd resin and the like may be used in combination.

Further, in order to enhance the ink absorbency of the ink receiving layer, various fillers in the ink receiving layer, such as silica, clay,
Fillers such as talc, diatomaceous earth, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, synthetic zeolite, alumina, zinc oxide, lithopone and satin white can also be dispersed in the ink receiving layer.

Further, as the base material used as the support of the ink receiving layer in the present invention, any conventionally known base materials such as transparency and opacity can be used. Suitable examples of the transparent base material include polyester resins. Examples thereof include diacetate-based resin, triacetate-based resin, acrylic-based resin, polycarbonate-based resin, polyvinyl chloride-based resin, polyimide-based resin, cellophane, film or plate such as celluloid, and glass plate. Preferable examples of the opaque base material include general paper, cloth, wood, metal plate, synthetic paper and the like, as well as the above-mentioned transparent base material subjected to opacity treatment by a known means.

The recording material of the present invention is formed by using the main materials as described above, but the preferable mode of the above (1) is that both the base material and the ink receiving layer are translucent, and the linear transmittance is 10%.
The above is the mode in which the entire recording material is translucent.

The recording material of this aspect is particularly excellent in translucency and is mainly used in the case of OHP or the like for projecting a recorded image on a screen or the like by an optical device, and is useful as a recorded material for transmitted light observation. .

In such a translucent recording material, a translucent ink-receiving layer is formed on the translucent substrate as described above from the polymer complex as described above or a mixture with another translucent polymer. Can be prepared by

As a method for forming such an ink receiving layer, a coating solution is prepared by dissolving or dispersing the above-mentioned polymer complex alone or a mixture with other suitable polymer in a suitable solvent, For example, a roll coating method, a rod bar coating method, a spray coating method, an air knife coating method, or the like is used to coat the transparent substrate with a known method, followed by a method of rapidly drying or a solution of a basic polymer or an acidic polymer. A method of applying one of the above and then applying the other solution to form a polymer complex on the substrate is preferable,
In addition, a method of hot-melt coating the above-mentioned polymer complex alone or a mixture with another polymer, or a single ink-receiving layer film is once formed from the above-mentioned material, and the film is laminated on the substrate. Other methods may be used.

The recording material of the aspect (1) formed as described above is a translucent recording material having sufficient translucency.

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

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

The linear transmittance T (%) referred to here means that the light is incident vertically on the sample, passes through the sample, and is at least 8c from the sample.
The spectral transmittance of the linear light that is received by the detector after passing through the slit on the light receiving side on the extension line of the incident optical path that is distant from m or more is, for example, 323 Hitachi self-recording spectrophotometer (manufactured by Hitachi Ltd.)
, Etc., and from the measured spectral transmittance,
It is a value obtained by obtaining the Y value of the tristimulus values of color and using the following equation.

T = Y / Y _o × 100 (1) T; linear transmittance Y; sample Y value Y _o ; blank Y value Therefore, the linear transmittance referred to in the present invention is for linear light, and is diffuse transmittance. (An integrating sphere is provided behind the sample to determine the transmittance including diffused light), opacity (the back of the sample is backed with white and black, and the ratio is calculated). This is different from the method of evaluating translucency using diffused light.

Since the behavior of linear light is a problem in devices that use optical technology, in evaluating the translucency of the recording material to be used in those devices, the linear transmittance of the recording material is Seeking is especially important.

For example, when observing a projected image with OHP, the contrast between the recorded part and the non-recorded part is high, and in order to obtain a clear and easy-to-see image, the non-recorded part in the projected image must be bright, that is, the linear transmittance of the recording material. Is required to be above a certain level. In the test using the OHP test chart, 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, preferably 10% or more. Needed to be. Therefore, a recording material suitable for this purpose needs to have a linear transmittance of 2% or more.

The preferred embodiment of (2) above is also one embodiment of (1) above, in which the surface of the ink receiving layer is smooth, and JIS Z8741
45 degree specular gloss based on 30% or more.

The recording material of this type is particularly useful as a recording material for surface image observation, which has excellent surface gloss and full color and sharpness. The recording material in this embodiment may be transparent or opaque, and any of the above-mentioned transparent and opaque substrates can be used. Further, the ink receiving layer formed on these substrates may be transparent or opaque.
The materials and methods used for forming the ink receiving layer are the same as those in the above aspect (1), but the above-mentioned fillers and the like make the ink receiving layer opaque as long as the surface of the ink receiving layer can maintain smoothness. You can use as much as you like.

In addition to the above-mentioned coating method, a cast coating method may be used, or a gloss roll may be used for glossing, if necessary.

In the present invention as described above, the thickness of the ink receiving layer formed on the substrate is usually about 1 to 200 μm, preferably about 3 to 100 μm, and more preferably about 5 to 30 μm.

Further, in the present invention, in the recording material of the various aspects as described above, by applying an organic or inorganic fine powder to the recording surface at a rate of about 0.01 to about 1.0 g / m ² . It is possible to further improve the transportability of the obtained recording material in the printer, the blocking resistance during stacking, the fingerprint resistance, and the like.

Although the present invention has been described above by exemplifying typical aspects of the recording material of the present invention, the recording material of the present invention is of course not limited to these aspects. In any case, the ink receiving layer contains a dispersant, a fluorescent dye, and a pH.
Various known additives such as regulators, defoamers, lubricants, preservatives and surfactants can be included.

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 exhibits excellent ink receptivity as in the case where the ink receptive layer is formed of a conventional water-soluble polymer, gives a recorded image with excellent sharpness, and under high humidity conditions. However, the surface does not become sticky or sticky.

Therefore, in recording a full-color image as well as a mono-color image, even when different color inks are overlapped and adhered to the same place within a short period of time, there is no ink bleeding or bleeding phenomenon, and a high-resolution clear recording image is obtained. Is obtained.

Moreover, the recording material of the present invention is different from the recording material using the conventional water-soluble polymer, even when the recording as described above is performed under extremely high humidity conditions, the surface of the ink receiving layer becomes tacky or sticky. Since it does not occur at all, problems do not occur in the printer, and blocking and color transfer do not occur even when stacked.

The excellent action and effect under such high humidity condition is that the two polymers used for forming the ink receiving layer have, for example, interionic electrostatic force, hydrogen bond, van der
It is considered that some weak bonds are generated due to the Walls force, partial transfer of electric charges, etc. to form a polymer complex, and excellent water resistance is exhibited even under high humidity conditions while maintaining high ink receptivity.

It was totally unexpected that the above excellent effects were achieved by the water-insoluble polymer complex,
This is because the ink is a water-polyhydric alcohol mixed system, and thus the applied ink temporarily dissolves or swells the ink receiving layer of the recording material to promote the reception of the ink, and after receiving the water, It is considered that this is because the ink receiving layer returns to the original water-insoluble polymer complex by absorption and evaporation. Incidentally, such a theory is just an imagination,
The present invention is not limited in any way.

In the present invention, it is also possible to provide a material having an excellent surface gloss that has not been seen in the conventional recording material for inkjet, and by recording the recorded image on a screen or the like by an optical device such as a slide or OHP. Things used for observation,
It can be applied to applications other than conventional surface image observation, such as a color separation plate when creating a positive plate for color printing, or CMF used for a color display such as liquid crystal.

Hereinafter, the present invention will be described in more detail with reference to Examples. In the text, parts are based on weight.

Example 1 Polyvinylpyrrolidone 10% aqueous solution (PVPK-90, manufactured by GAF) 6
6 parts and 34 parts of a 10% aqueous solution of a methyl vinyl ether / maleic anhydride copolymer (GANTREZ AN-169, manufactured by GAF) were mixed. The mixed solution gels to form a polymer complex, and 100 parts of N, N-dimethylformamide is added to this mixed solution and heated to 90 ° C. to form a solution, which is used as a coating solution.

A 100 μm thick polyethylene terephthalate film (manufactured by Toray) is used as a light-transmitting substrate, and the coating solution having the above composition is applied onto the film by a bar coater method so that the film thickness after drying is 8 μm. Then, it was dried at 80 ° C. for 10 minutes to obtain the translucent recording material of the present invention.

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

Examples 2 to 5 and Comparative Examples 1 to 3 A coating solution was prepared in the same manner as in Example 1 with the following compositions, and the same as in Example 1 was applied on the same polyethylene terephthalate film as that used in Example 1. An ink-receiving layer was provided on each of the four recording materials to obtain four kinds of translucent recording materials of the present invention and three kinds of recording materials for comparison.

Example 2 Polyvinylpyrrolidone (manufactured by PVPK-90GAF) <10% aqueous solution> 66 parts Methyl vinyl ether / maleic anhydride monoethyl ester copolymer (GANTREZ ES425, manufactured by GAF) <Diluted in 10% ethanol solution> 34 parts Example 3 Polyvinylpyrrolidone (PVPK-90GAF) <10% aqueous solution> 75 parts isobutylene / maleic anhydride copolymer (isoban 10,
Kuraray Isoprene) <10% DMF solution> 25 parts Example 4 Polyvinylpyrrolidone (PVPK-90GAF) <10% aqueous solution> 66 parts Tannic acid <10% aqueous solution> 34 parts Example 5 Poly-N-vinylimidazole <10 % Ethanol solution>
66 parts Methyl vinyl ether / maleic acid monoethyl ester <10% ethanol solution> 34 parts Example 6 Polyvinylpyrrolidone <10% aqueous solution> 56 parts Methyl vinyl ether / maleic acid monoethyl ester <10% ethanol solution> 19 parts D-sorbitol / Benzaldehyde condensate <Gelol D, manufactured by Shin Nippon Rika, 10% DMF solution> 25 parts Comparative Example 1 polyvinyl alcohol (PVA-217, manufactured by Kuraray) 10 parts water 90 parts Comparative Example 2 polyvinylpyrrolidone (PVPK-90, manufactured by GAF) 10 parts Water 90 parts Comparative Example 3 Polyvinylpyrrolidone (manufactured by PVPK-90GAF) <10% aqueous solution> 50 parts Polyvinyl alcohol (PVA-220, manufactured by Kuraray) 50 parts For the recording materials of the above Examples and Comparative Examples, Of 4
Inkjet recording was carried out using a recording device having an on-demand type inkjet recording head (ejection orifice diameter 60 μm, piezoelectric oscillator driving voltage 70 V, frequency 2 KHz) that ejects ink using a piezo oscillator, using one kind of ink. .

Yellow ink (composition) CI Direct Yellow 86 2 parts Diethylene glycol 20 parts Polyethylene glycol # 200 10 parts Water 70 parts Red ink (composition) CI Acid Red 35 2 parts Diethylene glycol 20 parts Polyethylene glycol # 200 10 parts Water 70 parts Blue ink (composition) ) CI Direct Blue 86 2 parts Diethylene glycol 20 parts Polyethylene glycol # 200 10 parts Water 70 parts Black ink (composition) CI Food Black 2 2 parts Diethylene glycol 20 parts Polyethylene glycol # 200 10 parts Water 70 parts Recording of Examples and Comparative Examples The evaluation results of the materials are shown in Table 1.

The measurement of each evaluation item in Table 1 was performed according to the following method.

(1) The ink fixing time depends on the recording material after recording.
When left at room temperature (20 ° C. 65% RH) and touching the recorded image with a finger, the time when the ink dries and does not adhere to the finger was measured.

(2) Dot density is based on JIS K7505 applied to printing micro dots. Sakura Micro Densidometer PDM-5
(Konishi Roku Photo Industry Co., Ltd.) was used to measure the black dots.

(3) OHP suitability was measured as a typical example of optical equipment, and it was judged by projecting a recorded image on a screen with OHP and visually observing it.
The recorded image has a high OD (optical density), a high-contrast, clear, and easy-to-see projection image can be obtained. 〇, the non-recorded area is slightly dark, the OD of the recorded image is slightly low, pitch width 0.5 mm, thickness 0.25 mm The line of which the line cannot be clearly discriminated is Δ, the non-recorded part is considerably dark, the OD of the recorded image is considerably low, and the line of 1 mm pitch width and 0.3 mm thickness cannot be clearly discriminated or the non-recorded part and the recorded image Those that were indistinguishable were marked with x.

(4) For the linear transmittance, a 323 type Hitachi self-recording spectrophotometer (manufactured by Hitachi, Ltd.) was used, the distance from the sample to the light receiving side mud was kept at about 9 cm, and the spectral transmittance was measured. It was determined by the equation (1).

(5) Transportability cannot be recorded due to stickiness on the surface of the ink receiving layer when the recording material was attached to the printer under the conditions of 35 ° C and 85% RH, and could not be transported by the printer's feed roller. The ones were evaluated as x, and the other ones were evaluated as ◯.

(6) In the blocking, 12 hours after the printing, a fine paper was brought into close contact with the printed surface and stored for 12 hours. After storage, those that did not cause adhesion between the recording material and the high-quality paper were rated as ◯, and those that did not stick were rated as x.

(7) The formation of the polymer complex was evaluated as ◯ when a solution of the basic polymer and the acidic polymer was rapidly increased or gel was formed, and as x when the solution was not formed.

Examples 7 and 8 and Comparative Examples 4 and 5 The ratio of the two polymers used in Example 2 (PVPK-90 = X, Gantrez ES-425 = Y) was changed to the second.
Translucent recording materials of the present invention and comparative examples were obtained in the same manner as in Example 2 except that the ratios shown in the table were used.

However, the evaluation items and evaluation methods were as follows.

(1) Ink fixability; same as the above method.

(2) Projection image suitability: The sharpness of the projected image was evaluated. When the color development of the dye was good and the image did not become turbid and could provide a clear image, it was rated as ◯, when the projected image was not sharp, as x, and the medium level was rated as Δ.

(3) Transportability: Same as the above method.

(4) Blocking; same as the above method.

(5) Water resistance; When immersed in still water for 1 minute, the ink receiving layer was dissolved and disappeared or peeled off from the base material x, when the surface of the immersed ink receiving layer was rubbed with a finger The damage was evaluated as Δ, and the good ones were evaluated as ◯.

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Claims (1)

[Claims] 1. An ink jet recording material comprising an ink receiving layer provided on a substrate, wherein the ink receiving layer is formed mainly of a polymer complex of a basic polymer and an acidic polymer to form the polymer complex. The weight ratio of the above two polymers is in the range of (basic polymer / acidic polymer) = 0.1 to 20, and the recording material as a whole is translucent. .