JPS6213378A - Recording material - Google Patents

Abstract

PURPOSE:To obtain a recording material for ink ink jet recording which has excellent ink receptivity, water resistance and clearness of recorded images and capable of being used for observation of transmitted light, by incorporating a specified polymer complex into an ink-receiving layer. CONSTITUTION:The ink-receiving layer comprises a polymer complex of a basic polymer and a phenolic acidic polymer. Particularly useful examples of preferred basic polymer include homopolymers and copolymers of N- vinylpyrrolidone, N-vinylpiperidone, N-vinylcaprolactam, N-vinylforpholine, N-vinyl-2-oxazolidone and N-vinyl-5-methyl-2-oxazolidone. The phenolic acidic polymer may be a phenolic resin or an initial condensate thereof which is obtained, for example, from a phenol having a hydroxyl group in an aromatic ring, such as phenol and m-cresol, or a derivative thereof by an addition or condensation reaction with an aldehyde such as formaldehyde.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a recording material suitably used in an inkjet recording method, and in particular to a recording material that has excellent ink receptivity, sharpness of recorded images, and water resistance. Regarding.

(Prior Art) Inkjet recording methods include various ink (recording liquid) ejection methods, such as an electrostatic suction method, a method that applies mechanical vibration or displacement to the ink using a piezoelectric element, and a method that heats the ink to foam it. This method utilizes the pressure to generate and fly ink droplets, and some or all of them adhere to a recording material such as paper to perform recording, but it generates little noise and It is attracting attention as a recording method that can perform high-speed printing and multicolor printing.

Ink for inkjet recording is mainly composed of water for safety and recording characteristics, and polyhydric alcohols are added to prevent nozzle clogging and improve ejection stability. In many cases.

The recording material used in this inkjet recording method has conventionally been a recording material consisting of a base material called ordinary paper or inkjet recording paper on which a porous ink receiving layer is provided.

However, as the performance of inkjet recording apparatuses increases and becomes more widespread, such as faster recording speeds and multicolor recording, more advanced and wide-ranging properties are being required of recording materials.

In other words, as a recording material for inkjet recording to obtain high-resolution, high-quality recorded images, (1) the ink can be accepted into the recording material as quickly as possible, and (2) Inrad-2. (3) Even if the dots overlap, the ink deposited later will not flow into the dots deposited earlier;
・The diameter of the ink dot should not be larger than necessary; (4) the shape of the ink dot should be close to a perfect circle, and the circumference should be smooth; (5) the OD (optical density) of the ink dot should be high; The surrounding area should not be blurred.

It is necessary to satisfy basic requirements such as:

Furthermore, in order to obtain high-resolution recorded image quality comparable to color photography using a multicolor inkjet recording method, in addition to the above-mentioned performance requirements, (6) the coloring components of the ink must have excellent coloring properties.

(7) The ink fixation properties are particularly excellent since the same number of droplets as the number of ink colors may adhere to the same spot, (8) The surface must be glossy, (9) White High degree.

etc. are required in a weighted manner.

In addition, images recorded by the inkjet recording method have traditionally been used exclusively for observing surface images, but as the performance of inkjet recording devices improves and becomes more widespread, surface images such as i
There is an increasing demand for recording materials suitable for uses other than recording.

Applications of recording materials other than surface image observation include those used to project recorded images onto a screen or the like using an optical device such as a slide or OHP (overhead projector) and observe those images, and color printing. Examples include color separation plates used to create positive plates, and CMF (color mosaic filters) used in color displays such as liquid crystals.

When a recording material is used for surface image observation, the diffused light of the recorded image is mainly observed, whereas for recording materials used in these applications, the problem is mainly the transmitted light of the recorded image. Become. Therefore, it is required to have excellent light transmittance, especially linear light transmittance, in addition to the above-mentioned performance requirements of the general recording material for inkjet recording.

(The problem that the invention is trying to solve) However,
The reality is that there is still no known recording material that satisfies all of these required performances.

In addition, many conventional recording materials for surface image observation use a method in which a porous ink-receiving layer is provided on the surface, and the ink is received in the porous voids to fix the recording material. The surface of the recording material was not glossy due to the nature of the recording material.

On the other hand, when the surface of the ink-receiving layer is non-porous, non-volatile components such as polyhydric alcohols in the ink remain on the surface of the recording material for a long time after recording, and the drying and fixing time of the ink is long. There are disadvantages in that clothing may get dirty or the recorded image may be damaged if it comes into contact with the recorded image.

In addition, in the case of recording materials that use water-soluble polymers to form the ink-receiving layer in order to improve affinity with ink and ink receptivity, the surface of this ink-receiving layer becomes sticky under high humidity conditions. Therefore, when it is installed in a printer, it adheres to the printer's feed roller, etc., making it impossible to convey the recording material, and also causing blocking of the recording materials when stacked.

Therefore, an object of the present invention is to provide a recording material for inkjet recording that is particularly excellent in ink receptivity, water resistance, and clarity of recorded images.Other objects of the present invention are
An object of the present invention is to provide a recording material for full-color inkjet recording that has excellent ink receptivity, sharpness of recorded images, and surface gloss, and does not cause stickiness or blocking on one surface even under high humidity conditions.

Another object of the present invention is to use an optical device such as a slide or OHP to project a recorded image onto a screen for observation, a color separation plate for creating a positive plate for color printing, or a color separation plate for liquid crystal display. C used for display
An object of the present invention is to provide a recording material for inkjet recording that can be used for observation of transmitted light such as MF.

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

(Disclosure of the Invention) That is, the present invention provides an inkjet recording material in which an ink-receiving layer is provided on a base material, wherein the ink-receiving layer contains a polymer complex of a basic polymer and a phenolic acidic polymer. This is an inkjet recording material characterized by:

To explain the present invention in detail, the main feature of the recording material of the present invention is that its ink-receiving layer is composed of a polymer complex of an FA-based polymer and a phenolic acidic polymer. The purpose is to be achieved.

The recording material of the invention generally consists of a base material as a support and a recording surface provided on the surface of the base material, that is, an ink-receiving layer. Examples include an embodiment in which all of the layers are translucent and the recording material as a whole is translucent, and (2) an embodiment in which the surface of the ink-receiving layer is smooth and glossy.

Further, each ink receiving layer may also function as a support at the same time.

The present invention will be explained in more detail using the above preferred embodiments as representative examples.

The polymer complex that primarily characterizes the present invention is composed of a basic polymer and a phenolic acidic polymer.

Conventional polymer complexes consisting of a basic polyamide and an acidic polymer are known, for example, in Japanese Patent Publication No. 37017/1982 and Japanese Patent Publication No. 42744/1989.

The present inventor has discovered that the above polymer complex is soluble in good solvents such as dimethylformamide and dimethyl sulfoxide, is useful for forming an ink receiving layer of recording materials, and has various properties such as ink fixability and water resistance. It was discovered that an excellent recording material could be obtained (Patent Application No. 60-2633)
(See specification No. 3).

However, the ink-receiving layer obtained in this way has low durability against the polyhydric alcohol contained in the ink, and the film strength of the part of the ink-receiving layer that has received high-density ink dots is weakened, resulting in a surface that is difficult to contact with. When it comes into contact with an item or something, the printed part may peel off or peel off from the base film.
A new problem has arisen in that the ink receiving layer of the recording material may be damaged.

As a result of further research in order to solve the above-mentioned problems while retaining various advantages of the prior invention, the present inventors found that a certain specific polymer, namely phenol acidic polymer, was used as the acidic polymer forming the polymer complex. The present invention was based on the finding that when a polymer having the above-mentioned properties is selected, the film of the ink receiving area is strong and resistant to peeling or damage, especially in areas where ink dots are concentrated.

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-)limethylpyrrolidone, N-vinyl-3
-Benzylpyrrolidone, N-vinylpiperidone, N-vinyl-4-methylpiperidone, N-vinyl-caprolactam, N-vinylcapryllactamphorin, N-vinylthiopyrrolidone, N-vinyl-2-
Homopolymers such as pyridone or random copolymers, blow copolymers, graft copolymers, etc. with other common polymers; 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, block copolymers, graft copolymers, etc. with other common monomers - 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.: Examples include homopolymers such as 2- or 4-vinylpyridine, random copolymers with other common monomers, block copolymers, graft copolymers, etc. Other copolymerizable monomers that may be used in the above include methacrylate, acrylate, acrylamide, acrylonitrile, vinyl ether, vinyl acetate, vinylimidazole,
Ethylene, styrene and other common heptamers, among others, are particularly useful in the present invention, such as N-vinylpyrrolidone, N-vinylpiperidone, N-vinylprolactam, N-vinylmorpholine, N-vinyl-2 -Oxacylidone, a homopolymer of N-vinyl-5-methyl-2-oxacylidone.

Copolymers, etc. In the case of a copolymer, it is preferable that the above-mentioned nitrogen-containing polymer is included in an amount of 50 mol % or more.

Furthermore, the phenolic acidic polymer that can form a polymer complex with the above-mentioned basic polymer has a phenolic hydroxyl group in its main chain and/or side chain.

Examples of such phenolic acidic polymers include those having a phenol acidic group in the main chain, such as phenol, m-cresol, 3゜5-xylenol, P-alkylphenol, resorcinol, and hydroxyl groups such as α- or β-naphthol. Examples include so-called phenol resins or initial condensates thereof, which are obtained by addition/condensation reaction with aldehydes such as formalin, using phenols or their derivatives having the following in their aromatic rings as monomers. These polymers may be homopolymers, copolymers, or random, block, or graft copolymers.

These phenolic acidic polymers range from those with relatively low molecular weights that are soluble in water and organic solvents to those with high molecular weights that are insoluble and infusible. Particularly useful are those that are soluble, such as precondensates of phenolic resins.

Although these phenolic acidic polymers are generally hydrophilic, they can only form a hard and brittle film and cannot be used at all as an ink-receiving layer of a recording material. By forming a complex with a synthetic polymer, an ink-receiving layer having various excellent properties can be formed.

In addition, examples of polymers having phenolic hydroxyl groups in the side chains include polymers of vinyl heptads having phenolic hydroxyl groups such as vinylphenol and vinylnaphthol, or copolymers with other common monomers; A modified polymer obtained by modifying a general polymer having a functional group such as a group or an amine group with a compound having a phenolic hydroxyl group can also be used in the same manner as the above-mentioned phenolic resin.

The present inventor has been conducting various research on mixtures of basic polymers and phenolic acidic polymers such as those shown in L, and found that by mixing these polymers in a solution, both polymers have some kind of interaction. If both polymers are mixed in a relatively good solvent, the polymer complex will precipitate, and if they are mixed in a relatively good solvent, a significant increase in viscosity will occur. It has been found that the resulting polymer has properties that differ from the mere mixture of both polymers used.

Therefore, the polymer complex used in the present invention means a polymer complex made of the above-mentioned polymers.
It can be prepared by a method similar to that described in 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. The ink-receiving layer does not become sticky at all, and the strength of the ink-receiving part of the ink-receiving layer is stronger than when other general acidic polymers are used, and the film does not peel off even when touched by fingers or objects. It was discovered that it is difficult to break.

Polymer complexes such as those described above generally do not dissolve in relatively strong solvents such as water, alcohols, esters, hydrocarbons, etc., so both polymers are dissolved in these poor solvents and the two warm liquids are mixed. By,
Polymer complexes for use in the present invention 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 phenolic 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, an ink-receiving layer with high strength and excellent ink-receptivity, image clarity, water resistance, and ink resistance can be formed. I can do it.

In addition, the ratio of both polymers used is 1 weight ratio of basic polymer/phenolic acidic polymer of 20/1 to 1.
/10, and preferably the ratio is such that the basicity and acidity of each polymer are approximately equal. 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. In other words, if there is too much basic polymer, water resistance will decrease,
Furthermore, if the amount of the phenolic acidic polymer is too large, the ink receptivity will decrease.

In addition, as stated in Japanese Patent Publication No. 59-174382, D
- Condensation products of sorbitol and benzaldehyde may be added in proportions of 0.1 to 50% by weight of the polymer complex.

The ink-receiving layer of the recording material of the present invention is formed using the above-mentioned polymer complex, but in the present invention, in addition to the above-mentioned polymer complex, other light-transmitting polymers, such as It may also be used in combination with polymer complexes.

Preferred examples of such other polymers include albumin, gelatin, casein, starch, cationic starch, gum arabic, natural resins such as sodium alginate, and polyvinyl alcohol.

Examples include synthetic resins such as polyamide, polyacrylamide, quaternized polyvinylpyrrolidone, polyethyleneimine, polyvinylbilicylium halide, melamine resin, polyurethane, polyester, and sodium polyacrylate, and one or more of these materials may be used in combination as desired. be done.

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, phenol resin, Alyad resin, etc. 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, calcium sulfate, barium sulfate, aluminum silicate, synthetic zeolites, alumina, zinc oxide, lithopone, satin white, and the like can also be dispersed in the ink-receiving layer.

In addition, as the base material used as the support for the ink receiving layer in the present invention, any conventionally known base material such as transparent or opaque can be used, and suitable examples of the transparent base material include, for example, polyester resin. , diacetate resins, triacetate resins, acrylic resins, polycarbonate resins, polyvinyl chloride resins, polyimide resins, films or plates of cellophane, celluloid, and glass plates. Preferred examples of the opaque substrate include, for example, general paper, cloth, wood, metal plates, synthetic paper, and the like, as well as the above-mentioned transparent substrates treated to make them opaque by known means.

The recording material of the present invention is formed using the above-mentioned main materials, and in the preferred embodiment (1) above, both the base material and the ink receiving layer are translucent, and the in-line transmittance is 10.
% or more, and the recording material as a whole is translucent.

The recording material of this embodiment is particularly excellent in translucency, and is used in OHP applications in which recorded images are projected onto a screen or the like using an optical device.
It is mainly used in cases such as the following, and is useful as a recording material for transmitted light observation.

Such a translucent recording material is produced by forming a translucent ink-receiving layer on the translucent base layer from the above-mentioned polymer complex alone or a mixture with other translucent polymers. It can be prepared.

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 polymers in a suitable solvent, and the coating solution is prepared by: For example, a method in which a light-transmitting base is coated on the Murakami using a known method such as Everol coating method, rod bar coating method, spray coating method, air knife coating method, etc., and then quickly dried, or a basic polypropylene or phenolic acidic polymer. A preferred method is to apply either one of the above solutions and then apply the other solution to form a polymer complex on the substrate.Alternatively, the above polymer complex alone or in a mixture with other polymers can be hot-melt coated. Alternatively, other methods may be used, such as forming a single ink-receiving layer film from the above-mentioned materials and then laminating the film to the above-mentioned substrate.

The recording material of the embodiment (1) formed as described above is a light-transmitting recording material having sufficient light-transmitting properties.

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 more than cm and is received by the detector is measured using, for example, the 323-type Hitachi self-recording spectrophotometer (manufactured by Hitachi, Ltd.). The Y value of the tristimulus value of one color is determined from the measured spectral transmittance, and is determined by the following formula.

T=Y/Y, XI 00 (1) T ; Linear transmittance Y ; Y value of sample Y, Y value of 1 blank Therefore, the linear transmittance referred to in the present invention is for straight light, and is the diffuse transmittance. (An integrating sphere is placed behind the sample to determine the transmittance including diffused light.)
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 a clear and easy-to-see image with 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. O)! In the test using the test chart at P, in order to obtain an image suitable for the above purpose,
The in-line transmittance of the recording material is required to be 2% or more, and preferably 10% or more in order to obtain a clearer image. Therefore, recording materials suitable for this purpose are:
It is necessary that its in-line transmittance is 2% or more.

The preferred embodiment of (2) above is also one of the embodiments of (1) above, in which the surface of the ink receiving layer is smooth and JISZ
It is characterized by a 45 degree specular gloss based on 8741 of 30% or more.

This type of recording material has particularly excellent surface gloss, and is particularly useful as a recording material for observing surface images in full color and excellent clarity. The recording material in this embodiment may be transparent or opaque, and either the above-mentioned transparent or opaque base materials can be used. The ink receiving layer formed on these base materials may also be transparent or opaque.
The materials and methods used to form the ink-receiving layer are the same as those in embodiment (1) above, but the filler, etc., can be used to make the ink-receiving layer opaque as long as the surface of the ink-receiving layer can maintain smoothness. You may use it to the extent that it suits you.

If necessary, a cast coating method may be used in addition to the above-mentioned coating method, or glossing may be performed using a gloss roll.

In the present invention as described above, the thickness of the ink receiving layer formed on the base material is usually about 1 to 200 JLm, preferably about 3 to 100 μm, and more preferably 5 to 30 JLm.
That's about it.

Furthermore, 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/rrf. 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 explained above by illustrating typical aspects of the recording material of the present invention, but of course the recording material of the present invention is not limited to these aspects. Also, the ink-receiving layer contains a dispersant, fluorescent dye, P
Various known additives such as H regulators, antifoaming agents, lubricants, preservatives, and surfactants 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 exhibits excellent ink receptivity similar to those in which the ink receptive layer is formed from a conventional water-soluble polymer, provides recorded images with excellent clarity, and can withstand high humidity. The surface will not become sticky or sticky even under certain conditions.

Therefore, when recording full-color images as well as monochrome images, even if different colored ink adheres to the same spot repeatedly within a short period of time, there will be no ink flowing out or seeping, and the Sky Ink e-folding High-resolution, clear recorded images can be obtained without a drop in heat temperature.

Moreover, unlike recording materials using conventional water-soluble polymers, the recording material of the present invention does not cause the surface of the ink-receiving layer to become sticky or sticky even when the above-mentioned recording is performed under extremely high humidity conditions. Since this does not occur at all, there is no problem in the printer, and there is no blocking or color bleed even when stacked.

The excellent effect under such high humidity conditions is due to the fact that the two types of polys 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 weak bonds occur due to Waalska, partial transfer of charges, etc., forming a polymer complex, which exhibits excellent water resistance even under high humidity conditions while maintaining high ink receptivity.

It was completely unexpected that such excellent effects as described above could be achieved by a water-insoluble polymer complex.
This is because the ink is a mixture of water and polyhydric alcohol, so the applied ink temporarily dissolves or swells the ink-receiving layer of the recording material without reducing its film strength, allowing it to accept the ink. This is believed to be because the ink-receiving layer returns to its original water-insoluble polymer complex by absorption and evaporation of water after receiving the water. It should be noted that such a theory is just imagination and does not limit the present invention in any way.

With the present invention, it is possible to provide an excellent surface gloss that has not been seen with conventional inkjet recording materials, and it is also possible to provide recorded images by projecting them onto a screen or the like using an optical device such as a slide or OHP. It can be applied to applications other than conventional surface image observation, such as those used for observation, color separation plates when creating a positive plate for color printing, or CMF used for color displays such as liquid crystals.

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

Example 1 Polyvinyl vinyl = 71J door (PVPK -90, G
88 parts of a 10% dimethylformamide (hereinafter referred to as DMF) solution (manufactured by AF) and 12 parts of a 10% DMF solution of a novolac type phenol resin (Regitop PSK-2320, manufactured by Gunei Kagaku) were mixed. The mixed solution gels to form a polymer complex, and when heated to 90° C. while stirring, the mixed solution becomes a solution, which is used as a coating solution.

A polyethylene terephthalate film (manufactured by Toshi) with a thickness of 1100p was used as a translucent base material, and the coating solution with the above composition was applied onto this film using a bar coater so that the film thickness after drying was 8μ. The recording material was coated according to the method and dried at 100° C. for 10 minutes 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 4, Comparative Examples 1 to 2, and Reference Side Using the following compositions, coating solutions were prepared in the same manner as in Example 1, and coated on the same polyethylene terephthalate film as used in Example 1. , an ink-receiving layer was provided in the same manner as in Example 1, and 3
A seed transparent recording material of the present invention, two kinds of comparative recording materials, and a reference recording material were obtained.

"Shiranno" Vinylpyrrolidone/dimethylaminoethyl methacrylate copolymer CCOPOLYMER1145, G A F
) (10% ethanol/DMF solution) 70 parts novolac type phenolic resin (Resitop PSF'-4
261) (10% DMF solution) 30 parts Polyvinylpyrrolid 7 (PVPK-90, manufactured by GAF)
(10% DMF solution) 87 parts resol type phenolic resin (Regitop PS-2211) (10% ethanol/DMF solution) 13 parts
10% DMF solution) 85 parts Novolac type phenolic resin (Regitop PSK-2320) (10%
DMF solution) 10 parts D-'/rubitol/benzaldehyde condensate (Gelol D, manufactured by Shin Nihon Rika) (10 parts
%DMF solution) 5 parts DMF polyvinyl pyro IJ door (PVPK-90, manufactured by GAF) 10 parts DMF
90 parts Saimonno' Polyvinyl pyro IJ door (PVPK-90, made by GAF) (10% aqueous solution) 50 parts polyvinyl alcohol (PVA-217, made by Kuraray) (10% aqueous solution) 50 parts 1 consideration 1 Polyvinylpyrrolidone (PVPK- 90, made by GAF) (
10% DMF solution) 70 parts methyl vinyl ether/maleic anhydride monoethyl ester copolymer (
GAN, TREZ ES-425, made by GAF) (10%
Ethanol/DMF solution) 30 parts For the recording materials of the above examples, comparative examples, and reference examples,
Using the following four types of ink, a recording device having an on-demand inkjet recording head (discharge orifice diameter 60 pm, piezo oscillator drive voltage 70 V, frequency 2 KHz) that discharges ink using a piezo oscillator was used. Inkjet recording was performed.

L engineering! (Composition) C, 1, Direct Yellow 86 2 parts diethylene glycol 25 parts polyethylene glycol #200 15 parts water
60 parts C, R, Acid Red 35 2 parts diethylene glycol 25 parts polyethylene glycol #200 15 parts water
60 copies completed! (Composition) C, 1, Direct Blue 86 2 parts diethylene glycol 25 parts polyethylene glycol #200 15 parts water
60 parts Pan clay Z (composition) C, 1, Food black 2 2 parts diethylene glycol 25 parts polyethylene glycol #200 15 parts water
Table 1 shows the evaluation results of the recording materials of 60 copies Examples, Comparative Examples, and Reference Examples.

Each evaluation item in Table 1 was measured according to the following method.

(1) Ink fixation time is the time required for the ink to dry and stop adhering to your finger when you leave the recording material at room temperature (20°C, 65% RH) after recording and touch the recorded image with your finger. was measured.

(2) The dot'eji degree was measured for black dots using Sakura Microdensidometer PDM-5 (manufactured by Konishiroku Photo Industry Co., Ltd.) by applying JIS K7505 to printed microdots.

(3) OHP suitability was measured as a representative example of optical equipment, and the recorded image was projected onto a screen using OHP.
Judgment is made by visual observation. 0 indicates that the non-recorded area is bright, the recorded image has a high 00 (optical density), and a clear and easy-to-see projected image with high contrast is obtained, and 0 indicates that the non-recorded area is slightly dark and the recorded image is high. The OD of the image is slightly low.

If a line with a pitch width of 0.511 m1 and a thickness of 0.25 m square cannot be clearly distinguished, it is Δ, the non-recorded area is quite dark, the OD of the recorded image is quite low, the pitch width is 1+n+, and the thickness is 0.
A case where the 3 mm line could not be clearly distinguished or a case where the non-recorded area and the recorded image could not be distinguished was rated as "x".

(4) Straight line transmittance was determined by measuring the spectral transmittance 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 90 square meters, and measuring the spectral transmittance as described above ( 1) It was calculated using the formula.

(5) Transportability: When the recording material is installed in the printer under the conditions of 35°C and 85% RH, the ink receiving layer surface is sticky, so it cannot be transported by the printer's feed roller and recording cannot be performed. Those that did were marked as ×, and those that did not were marked as O.

(6) For blocking, after 1 hour of printing, high-quality paper was brought into close contact with the printed surface and stored for 12 hours. After storage, those in which no adhesion occurred between the recording material and the high-quality paper were rated as O, and those in which no adhesion occurred were rated as ×. Further, when a similar test was conducted 10 minutes after printing, those in which no adhesion occurred were rated O.

(7) Film strength is measured when the surface of the solid printed area of the ink-receiving layer is rubbed with a finger after 5 minutes of printing, and the film has no strength and peels off from the base film or the image is damaged. ×, otherwise it was set as 0.

(8) Regarding the formation of a polymer complex, when the respective solutions of the basic polymer and the phenolic acidic polymer were mixed, a case where there was a sudden increase in viscosity or formation of a gel was rated as 0, and a case where no gel was formed was rated as 0.

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L Sanko Dogami OOO@ ILJLJf Oo O.

Polymer kelp v-j7 y 0 0 0
0-Comparative Example--Dust Example 1 Eji and Kuchi J■Kun 10 minutes 1 minute 5 minutes-L-
Ichikami JJ! 1.2 +, 1 1.1
1-”L-1×××

Claims (2)

[Claims] (1) An inkjet recording material having an ink-receiving layer provided on a base material, wherein the ink-receiving layer contains a polymer complex of a basic polymer and a phenolic acidic polymer. Material. (2) The inkjet recording material according to claim (1), wherein the phenolic acidic polymer is an initial condensate of a phenolic resin.