JPS62140876A - Recording material - Google Patents

Abstract

PURPOSE:To provide an ink jet recording material excellent in ink receptivity, water resistance and clearness of recorded images, by incorporating a polymer complex of a basic polymer with a rosin-modified maleic acid in an ink-receiving layer provided on a base. CONSTITUTION:A recording material comprises a base and an ink-receiving layer, both thereof being light-transmitting and the ink-receiving layer having a smooth and glossy surface. A polymer complex incorporated in the ink- receiving layer is constituted of a basic polymer and a rosin-modified maleic acid, is soluble in good solvents such as dimethylformamide and dimethyl sulfoxide, and is useful for forming the ink-receiving layer. With the polymer complex used, a recording material excellent in various performances such as ink fixing properties and water resistance can be obtained. With the rosin- modified maleic acid selected as a constituent of the polymer complex, an ink-receiving layer showing a high film strength of an ink-receiving part, particularly, at parts where ink dots are concentrated and being free of blocking or color transfer even when printed films are stacked shortly after printing can be obtained.

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, particularly in terms of ink receptivity, clarity of recorded images, water resistance, blocking resistance, etc. Regarding excellent recording materials.

(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 allows 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.

Recording materials are also required to have more sophisticated and wide-ranging properties.

That is, as a recording material for inkjet recording to obtain high-resolution, high-quality recorded images, (i) the ink must be accepted by the recording material as quickly as possible;

(2) Even if ink dots overlap, the ink deposited later will not flow into the dots deposited earlier, and (3) the ink droplets will spread on the recording material and the diameter of the ink dot will become larger than necessary. (4) The shape of the ink dot is close to a perfect circle and its circumference is smooth. (5) The OD (optical density) of the ink dot is high.

The area around the dot 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 required performance, (6) the coloring components of the ink must have excellent color development; (7) Since the same number of droplets as the number of ink colors may adhere to the same spot, the ink fixation properties are particularly excellent; (8) The surface must be glossy; (9) Performance such as high whiteness is required.

In addition, images recorded by the inkjet recording method have traditionally been used exclusively for surface image observation, but as the performance of inkjet recording devices has improved and become more widespread, recording materials suitable for purposes other than surface image observation have become available. is becoming required.

Applications of the recording material other than surface image observation include those used to project recorded images onto a screen or the like and observe those images using an optical device such as a slide or an IFC overhead projector; Examples include color separation plates for creating positive plates for color printing, and CMF C color mosaic filters used for 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.

Another 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 surface stickiness, blocking, etc. even under high humidity conditions. It is in.

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 displays
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 invention as follows.

(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 rosin-modified maleic acid. 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 a basic polymer and rosin-modified maleic acid. is achieved.

The recording material of the present 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. For example, as a particularly preferred embodiment, (1)! ! Examples include an embodiment in which both the i-material and the ink-receiving layer 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 cyclic polymer and rosin-modified maleic acid.

Traditionally, polymer complexes containing basic polymers are 1
For example, Japanese Patent Publication No. 51-37017 and Japanese Patent Publication No. 51-37017
It is publicly known in Japanese Patent No. 5-42744.

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 surface of the ink-receiving area that has received high-density ink dots becomes sticky under hot and humid conditions. Phenomena such as stickiness and stickiness appear.

A new problem arose in that blocking and color transfer occurred when the films were stacked unless they were dried for a considerable period of time after printing.

As a result of further research, the present inventors, in order to further solve the above-mentioned problems while retaining the various advantages of the prior invention, found that when rosin-modified maleic acid was selected as one of the components forming the polymer complex. It was discovered that even in areas where ink dots are concentrated, the ink-receiving layer has a strong film, and that an ink-receiving layer without blocking or color transfer can be obtained even when the films are stacked together within a short period of time after printing. This is what we have come to.

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-oxazolidone, N-vinyl-4-methyl-2-oxacylidone, N-vinyl-2-thioxazolidone,
Homopolymers such as N-vinyl-2-mercaptobenzothiazole or random copolymers, block copolymers, and graft copolymers 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.; 2- or 4-vinylpyridine, etc. Examples include homopolymers and random copolymers, block copolymers, and graft copolymers with other common monomers. Other copolymerizable monomers that may be used in the above include methacrylates, acrylates, Acrylamide, acrylonitrile, vinyl ether, vinyl acetate, vinyl imidazole,
Ethylene, styrene, and other common heptamers particularly useful in the present invention include N-vinylpyrrolidone, N-vinylpiperidone, N-vinylcaprolactam, N-vinylmorpholine, and N-vinyl-2-oxanolitone. , a homopolymer, a copolymer of N-vinyl-5-methyl-2-oxazolidone, and the like. In the case of a copolymer, it is preferable that the above-mentioned nitrogen-containing monomer is included in an amount of 50 mol % or more.

In addition, the rosin used to form the rosin-modified maleic acid that can form a polymer complex with the above-mentioned basic polymer includes naturally produced rosin gum, wood rosin, and rosin obtained by refining tall oil. is abietic acid and its derivatives.

The rosin-modified maleic acid used in the present invention is obtained by adding maleic anhydride to the above-mentioned rosin, and rosin-modified maleic acid having various physical properties is easily available on the market and can be effectively used in the present invention. can do. These rosin-modified maleic acids are thought to have a single layer of maleic anhydride added to the unsaturated bonds of abietic acid, and the mechanism of formation of a polymer complex with a basic polymer, such as polyvinylpyrrolidone, is that the nitrogen of polyvinylpyrrolidone It is believed that the carboxyl group of the rosin-modified maleic acid acts on the atom and/or the oxygen atom in an ionic or hydrogen bonding manner.

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 temperature resistant, and when used to form the ink receiving layer of an inkjet recording material, it showed ink receptivity equivalent to that of conventional water-soluble polymers and gave a clear image.
It was discovered that even under high humidity conditions, the surface did not become sticky at all, and the strength of the part of the ink-receiving layer that received ink was even stronger, making it difficult for the film to peel or break even when touched by fingers or objects. This is what I did.

Polymer complexes such as those described above generally do not dissolve in relatively poor solvents such as water, alcohols, esters, hydrocarbons, etc., so both polymers are dissolved in these poor solvents and the two solutions are mixed. By this,
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.

Therefore, the polymer complex used in the present invention means a polymer complex consisting of the above-mentioned components. It can be prepared by a method similar to that described in the publication.)

The present inventor further conducted various studies on the uses of these polymer complexes, and found that although these polymer complexes are extremely wood-friendly, they do not have water resistance,
# It is wet, and when used to form the ink-receiving layer of an inkjet recording material, it showed ink-receptivity equivalent to that of conventional water-soluble polymers, giving clear images, and
Even under high humidity conditions, the surface does not become sticky at all, and the strength of the ink-receiving part of the ink-receiving layer is even stronger, so that no blocking phenomenon occurs even when the films are stacked together within a short time after printing. This is what I found out.

The basic polymer and rosin-modified maleic acid preferred for forming the above polymer complex each have a molecular weight of 500 or more, preferably 1.0.
00 or higher, by using both components of these molecular weights.

It is possible to form an ink-receiving layer that has high strength and excellent ink-receptivity, image clarity, water resistance, ink resistance, and blocking resistance.

In addition, the ratio of both polymers used is basic polymer/rosin modified maleic acid in a weight ratio of 100/1 to 10.
There is a range 1 that is 0/100, preferably 10015
~l 00150 is the ratio of fZ. If the weight ratio is outside the above range, the bond between the blue components will be insufficient,
The object of the present invention cannot be fully achieved. That is,
Too much basic polymer will reduce water resistance, and too much rosin-modified maleic acid will reduce ink receptivity.

Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 59-174382, D
- Condensation products of sorbitol and benzaldehyde may be added in proportions of 1 to 50% by weight of O7 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, polyvinyl alcohol, modified polyvinyl alcohol, polyamide, polyacrylamide, and quaternized polyvinyl. Pyrrolidone, polyethyleneimine, polyvinylpyricillium halide, melamine resin, polyurethane, polyester,
Examples include synthetic resins such as sodium polyacrylate, and one or more of these materials may be used in combination if desired.

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, phenolic resin.

Resins such as 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, 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 transparent base layer is coated on the Murakami surface by a known method such as a roll coating method, a rod bar coating method, a spray coating method, an air knife coating method, etc. and then quickly dried, or a solution of a basic polymer or rosin-modified maleic acid is applied. It is preferable to apply either one of the above solutions and then apply another solution to form a polymer complex on the substrate. Other methods may also 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 of the incident optical path that is more than c + s away and is received by the detector is 1. Then, from the measured spectral transmittance, the Y value of the tristimulus value of the color is determined, and the value is determined by the following formula.

T=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 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. In an OHP test chart test, in order to obtain an image suitable for the above purpose, the linear transmittance of the recording material should be 2% or more, and in order to obtain a clearer image, preferably 10% or more. something is required. Therefore, a recording material suitable for this purpose must have an in-line transmittance of 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 J l5
It is characterized by a 45 degree specular gloss based on Z8741 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 both the transparent and opaque base materials described above 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 Bm, preferably about 3 to 1004 Bm, more preferably 5 to 30 Bm. μm
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 0.0 g/m to about 1.0 g/m''. By doing so, it is possible to further improve the conveyance property in the printer, the blocking resistance during stacking, the #fingerprint property, 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 H11 moderators, 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 single 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 furthermore, under high humidity conditions. However, the surface does not become sticky or sticky.

Therefore, when recording full-color images as well as monochrome images, even if ink of different colors adheres repeatedly to the same location within a short period of time, there will be no ink flow or seepage phenomenon, and the strength of the ink-receiving layer will be reduced. Clear recorded images with high resolution can be obtained without any deterioration.

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 even when stacked, there is no blocking or color transfer.

This superior performance under high humidity conditions is due to the intermolecular forces (e.g., intermolecular electrostatic forces, hydrogen bonds, van der Waalska, charge It is thought that some kind of weak bonding occurs to form a polymer complex, which exhibits excellent water resistance, blocking resistance, etc. 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, a stand separation plate when creating a positive plate for color printing, or a CMF used for color displays such as liquid crystals.

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

Examples 1 to 8 Polyvinylpyrrolidone (PVPK) was used in the formulation shown below.
-90, made by GAF) 10% dimethylpho/l/muamide (
(hereinafter referred to as DMF) solution and rosin-modified maleic acid.
When mixed with 0% DMF solution, the mixture turned into a gel,
A polymer complex was formed. Add this mixture to 9
When heated to 0°C, it becomes a solution, which is used as a coating liquid.

A polyethylene terephthalate film (manufactured by Toshi) T-L with a thickness of 100 gm was used as a translucent base material, and a coating liquid with the above composition was applied onto this film so that the film thickness after drying was 8 JLm.
It was coated by a bar coater method so as to have the following properties 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.

1 凰1” Polyvinylpyrrolidone (PVPK-90) 10% DMF
Solution 10 parts Rosin-modified maleic acid (Harimac R-80) 10% DMF solution
2 Parts View A” Polyvinylpyrrolidone (PVPK-90) 10% DMF
Solution 10 parts rosin-modified maleic acid (Harimac R-80) 10% DMF solution
4th part flame direct delivery” Polyvinylpyrrolidone (PVPK-90) 10% DMF
Solution 10 parts rosin-modified maleic acid (Harimac R-100) 10% DMF solution
2 parts 1" Polyvinylpyrrolidone (PVPK-90) 10% DMF
Solution 10 parts rosin modified maleic acid (Harimac R-100) 10% DMF solution
Part 4 Sodenden 1 Polyvinylpyrrolidone (PVPK-90) 10% DM
F solution 10 parts Rosin-modified maleic acid (Harimac 135G) 10% DMF solution
2nd Division Mue” Polyvinylpyrrolidone (PVPK-90) 10%DMF
Solution 10 parts rosin modified maleic acid (Harimac 135G) 10% DMF solution
4 Parts 1 Polyvinylpyrrolidone (PVPK-90) 10% DMF
Solution 10 parts Rosin-modified maleic acid (Harimac 145P) 10% DMF solution
Part 2 Soyeongou” Polyvinylpyrrolidone (PVPK-90) 10% DMF
Solution 10 parts rosin modified maleic acid (Harimac 145P) io% DMF solution
4 parts Note: Harimak R-80 Softening point ("O) O~85 Acid value 20> Harimak R-1o manufactured by Yokoma Kasei Kogyo.

Softening point ("0) 100-104 Acid value 25> Yokoma Kasei Harimak 135G Softening point ("0) 130-140 Acid value 32-38 Yokoma Kasei Harimak 145P Softening point (℃) 135-145 Acid Value: 20-30 Yokoma Kasei Kogyo Comparative Examples 1-3 Coating liquids were prepared in the same manner as in the examples using the following compositions,
An ink-receiving layer was provided on the same polyethylene terephthalate film as used in the example in the same manner as in the example to obtain three types of recording materials for comparison.

HI JL [E] Polyvinylpyrrolid 7 (PVPK-90, G A F
Polyvinyl vinyl OIJ door (PVPK-90, G A
F) (10% aqueous solution) 50
Polyvinyl alcohol (PVA-217, manufactured by Kuraray)
(10% aqueous solution) 50 parts Comparison sword Polyvinyl vinyl OIJ door (PVPK-90, GA
F) (10% DMF solution) 70
methyl vinyl ether/maleic anhydride monoethyl ester copolymer (GANTHEZ ES-425, GA
(manufactured by F.F.) (10% ethanol/DMF solution) 30 parts The following 4
Inkjet recording is performed using a recording device that has an on-demand inkjet recording head (discharge orifice diameter 60#Lm, piezoelectric vibrator drive voltage 70V, frequency 2KHz) that discharges ink using a piezoelectric vibrator. carried out.

Direct ink (composition) C, 1, Direct Yellow 86 2 parts diethylene glycol 25 parts polyethylene glycol #200 15 parts water
60 parts Eeno (composition) C, 1, Acid Sea 2 Do 35 2 parts diethylene glycol 25 parts polyethylene glycol #2QO 15 parts water
60 parts LLLi (composition) C, 1, Direct Blue 86 2 parts diethylene glycol 25 parts polyethylene glycol #200 15 parts water
60th division supervisor (composition) G, 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 and Comparative Examples.

Each evaluation item in Table 1 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.
Black dots using M-5 (manufactured by Konishiroku Photo Industry Co., Ltd.)
Measured per.

(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 The OD of is rather low, the pitch width is 0.5 + sm, and the line with a thickness of 0.25 mm cannot be clearly distinguished.
．． A case where the 3+am 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) 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 cannot be done are marked with a ×, and items that cannot be marked with an O.

(6) For blocking, 1 hour after printing, a layer of high-quality paper was placed on the printed surface and stored for 12 hours. After storage, the case where no adhesion occurred between the recording material and the high-quality paper was rated 0, and the case where no adhesion occurred was rated x. Also, after printing a similar test 10
When the test was carried out after a few minutes, the samples that did not show adhesion were marked as ■.

(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, O.

(8) Regarding the formation of a polymer complex, when the droplets of the basic polymer and the phenolic acidic polymer were mixed, those in which there was a sudden increase in viscosity or the formation of gel were designated as O, and those in which no gel was formed were designated as X.

(9) Water insolubility was tested for water resistance to water at a water temperature of 25° C. based on the water resistance test of JIS K5400.7.2. Those that were water resistant were judged to be insoluble in water, and those that were not water resistant were rated x.

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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 rosin-modified maleic acid. Material. (2) The inkjet recording material according to claim (1), wherein the basic polymer is polyvinylpyrrolidone.