JPS62140877A - Recording material - Google Patents

Abstract

PURPOSE:To obtain a recording material for use in full-color ink jet recording which has excellent ink receptivity and luster of recorded images and is free of surface tackiness, blocking or the like even under a high humidity condition, by incorporating a polymer complex of a basic polymer with a styrene/maleic acid copolymer of an ester compound thereof in an ink-receiving layer. 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 styrene/maleic acid copolymer or an ester compound thereof, 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 styrene/maleic acid copolymer or an ester compound thereof selected as an acidic polymer constituting 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, more advanced and wide-ranging properties are being required of recording materials.

In other words, the recording material for inkjet recording to obtain high-resolution, high-quality recorded images must (1) be able to receive ink as quickly as possible on the recording material, and (2) have overlapping ink dots. (3) Ink droplets do not spread on the recording material and the diameter of the ink dot does not become larger than necessary, (4) ) The shape of the ink dot should be close to a perfect circle, and its circumference should be smooth. (5) The 00 (optical density) of the ink dot should be high and the periphery of the dot should not be blurred. need to be satisfied.

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 required performance, (6) the coloring components of the ink must have excellent color development; 7) The ink fixation properties are particularly excellent, as the same number of droplets as the number of ink colors may adhere to the same spot, (8) The surface must be glossy, (9) Whiteness A high level of performance, etc., 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 recording materials other than surface image observation include those used to project recorded images onto a screen etc. using optical equipment such as slides and OHP (overhead projectors) for observation, and color printing. Examples include color separation plates for creating positive plates, CMF C color mosaic filters used for color displays such as liquid crystals, etc.

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 excellent ink receptivity, sharpness of recorded images, and surface gloss even under high humidity conditions.

An object of the present invention is to provide a recording material for full-color inkjet recording that does not cause surface stickiness, blocking, etc.

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 is a polymer complex of a basic polymer and styrene/maleic acid or an ester thereof. An inkjet recording material characterized by containing:

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 a styrene/maleic acid copolymer or an esterified product thereof. Primarily, the objectives of the invention are thereby 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 thereof, 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 mainly characterizes the present invention is composed of a basic polymer and a styrene/maleic acid copolymer or an ester thereof.

Traditionally, polymer complexes containing basic polymers are
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 appeared, and a new problem arose in that if the films were not dried for a considerable period of time after printing, procession and color transfer would occur when the films were stacked together.

In order to solve the above-mentioned problems while retaining various advantages of the prior invention, the inventors of the present invention have developed a specific polymer, namely styrene/maleic, as the acidic polymer forming the polymer complex. When acid copolymers or their esters are selected, the film on the ink-receiving area is strong, especially in areas where ink dots are concentrated, and there is no blow 2 or color transfer even when the films are stacked together within a short time after printing. The inventors have discovered that an ink-receiving layer can be obtained that does not contain any ink-receiving layer, leading to the present invention.

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-vinylpiveridone, 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-oxazolidone, N-vinyl-2-thioxazolidone,
Homopolymers such as N-vinyl-2-mercaptobenzothiazole or random copolymers with other common monomers, block copolymers, graft copolymers, etc.: N-vinylimidazole, N-vinyl-2- Homopolymers of methylimidazole, N-vinyl-4-methylimidazole, etc., or random copolymers, block copolymers, graft copolymers, etc. with other common 7-mers; 2- or 4-vinylpyridine Other copolymerizable monomers that may be used in the above include homopolymers such as, random copolymers, block copolymers, graft copolymers, etc. with other common heptamers, and other copolymerizable monomers that may be used in the above Methacrylate, acrylate, acrylamide, acrylonitrile, vinylnitrile, vinyl acetate, vinylimidazole,
Such as ethylene, styrene and other common hexamers.

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

Furthermore, the styrene/maleic acid copolymer or its esterified product that can form a polymer complex with the above-mentioned basic polymer is a copolymer of styrene or a styrene derivative and maleic anhydride, or a partially esterified product thereof. Furthermore, a terpolymer comprising a third comonomer other than these heptamers may also be used. In addition to styrene, styrene derivatives include methylstyrene,
Any styrene derivative such as dimethylstyrene, trimethylstyrene, α-chlorostyrene, α-methylstyrene, etc. can be used. Examples of the third comonomer include olefins such as ethylene, propylene, and butylene, vinyl halides such as vinyl chloride and vinyl fluoride, vinyl esters such as vinyl acetate, alcohol esters of (meth)acrylic acid, and alcohol esters of (meth)acrylic acid. Any other comonomer copolymerizable with styrene and maleic anhydride, such as acrylamide, can be used. Any conventional copolymerization method may be used, and copolymerization methods with various copolymerization ratios are easily available on the market and used.

In the present invention, styrene/maleic acid copolymers with any copolymerization ratio or esterified products thereof can be used, but preferred are those with a styrene/maleic anhydride molar ratio of 5/l to 1/1. and the optimal one is 3
/1-1/i. When the molar ratio of maleic anhydride is too low, it becomes difficult to form an ink-receiving layer with sufficient water resistance. In addition, in the case of a terpolymer, a third comonomer can be included in a proportion accounting for up to about 50 mol% of the total monomers. When the ester is an ester with alcohol, propyl alcohol, butyl alcohol, etc., it is preferable that the ester accounts for up to about 50 mol% of the carboxyl groups in the above copolymer.If the degree of esterification is too high, the polymer complex may be insufficiently formed.

The above-mentioned styrene/maleic acid copolymer or its esterified product can be obtained and used in various molecular weights.

The present inventors have been conducting various research on mixtures of basic polymers as described above and styrene/maleic acid copolymers as described above or esterified products thereof. When the solution is mixed after being prepared as a solution, some interaction occurs between the two polymers, and the polymer complexes exhibit physical properties that are completely different from their respective properties before mixing. It has been found that even after forming a film, it has properties that are different from a mere mixture of each polymer.

For example, when the basic polymer is polyvinylpyrrolidone, such a polymer complex is composed of a carboxyl group of styrene/maleic anhydride or an ester thereof, and/or a nitrogen atom of the polyvinylpyrrolidone.
Alternatively, it is thought that it acts on the oxygen atom in an ionic or hydrogen bonding manner.

Therefore, the polymer complex used in the present invention means a polymer complex made of the above polymers (polymer complexes made of these polymers are disclosed in Japanese Patent Publication No. 51-37017
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 wood-friendly, they do not have water resistance,
It is temperature resistant, and when used to form the ink-receptive layer of inkjet recording materials, it showed the same ink-receptivity as conventional water-soluble polymers, giving clear images, and even under high humidity conditions. It was discovered that the surface did not become sticky at all, the strength of the part of the ink-receiving layer that received the ink was even stronger, and no blocking phenomenon occurred even when the films were stacked together within a short period of time after printing.

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 hot 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.

The basic polymer and styrene/maleic acid copolymer or ester thereof preferably have a molecular weight of 1,000 or more, preferably to, o, to form the above polymer complex.
oo to about 400,000, while in the case of styrene/maleic acid copolymer or its esterified product, it is 1.000 or more, preferably 1,500 to 10°0.
By using polymers with both of these molecular weights, it is possible to create an ink receptive product with high strength, excellent ink receptivity, image clarity, water resistance, ink resistance, and printing resistance. layers can be formed.

The ratio of both polymers to be used is such that the weight ratio of basic polymer/styrene/maleic acid copolymer or esterified product thereof is Zoo/1 to Zoo/100/Zoo, preferably l0015 to l00150. If the weight ratio deviates from the above range, the bond between both polymers will be insufficient, and the object of the present invention will not be fully achieved.

That is, if the amount of the basic polymer is too large, the water resistance will be reduced, and if the amount of the styrene/maleic acid copolymer or its esterified product is too large, the ink receptivity will be reduced.

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 0.1 to 50% by weight of the polymer complex (l/).

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, polyamide, polyacrylamide, quaternized polyvinylpyrrolidone, polyethyleneimine,
Synthetic resins such as polyvinyl bilicylium halide, melamine resin, polyurethane, polyester, and sodium polyacrylate may be mentioned, 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, phenol resin, alkyd 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 translucent base is coated on the Murakami surface by a known method such as a roll coating method, a rod bar coach ink method, a spray coating method, an air knife coating method, etc., and then quickly dried, or a method in which a basic polymer or styrene/maleic acid is applied It is preferable to form a polymer complex on the substrate by coating either one of the polymer or its esterified solution and then coating the other solution. Alternatively, other methods may be used, such as hot-melt coating a mixture with the above-mentioned materials, or forming a single film for the ink-receiving layer from the above-mentioned materials, and then laminating the film onto 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 that is on the extension of the incident optical path separated by more than ci and is received by the detector is measured using, for example, the 323-type Hitachi self-recording spectrophotometer (newly manufactured by Hitachi). 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 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. In an OHP test chart test, in order to obtain an image suitable for the above purpose, the linear transmittance of the recording material is 2% or more, and in order to obtain a clearer image, it is preferably 105 or more. That is required. Therefore, a recording material suitable for this purpose must have an in-line transmittance of 2% or more.

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 substrate is usually about 1 to 200 gm, preferably about 3 to 1004 m, more preferably about 5 to 30 gm.

Further, in the present invention, fine organic or inorganic powder is applied to the recording surface of the recording materials of various embodiments as described above at a rate of about 0.01 to about 1.0 g/rr1''. 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 embodiments of the liquid fertilizer material of the present invention, but of course the recording material of the present invention is not limited to these embodiments. 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 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 (such as intermolecular electrostatic forces, hydrogen bonds, van der Waalska, and electric 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, 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. Note that 1 part or % in the text is based on weight unless otherwise specified.

Examples 1 to 8 Polyvinylpyrrolidone (PVPK) was used in the formulation shown below.
-90, manufactured by GAF) 10% dimethylformamide (hereinafter referred to as DMF) solution and a 10% DMF solution of a styrene-maleic acid copolymer or an ester thereof were mixed. The mixed solution gels and forms a complex, but when this mixed solution is heated to 90° C. while stirring, it becomes a solution, which is used as a coating solution.

A polyethylene terephthalate film (manufactured by Toshi) with a thickness of 100 pm was used as a translucent base material, and a coating solution with the above composition was applied onto this film using a bar coater method so that the film thickness after drying was 871 m. 3 at 140°C.
The film was dried under conditions of 1 minute to obtain a translucent recording material of the present invention.

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

1st Remains” Polyvinylpyrrolidone (PVPK-90) 10% DMF
Solution 10 parts styrene/maleic acid ester copolymer (Oxilac 5H-101) 10% [1 MF solution 2 parts
Solution 10 parts styrene/maleic acid ester = l? Product (Oxilac 5) I-101
) 10% DMF solution 4 parts 1 part
” Polyvinylpyrrolidone (PVPK-90) 10% DMF
Solution 10 parts styrene/maleic acid ester copolymer (Oxirac 5H-201) 10% DMF solution 2 parts
Solution 10 parts Styrene/maleic acid ester copolymer (Oxirac 5H-201) io%[]MF solution 4 parts Polyvinylpyrrolidone (PVPK-90) 10% DMF
Solution 10 parts styrene/maleic acid copolymer (SMA 2000) 10% DMF solution
4-part Shiofu” Polyvinylpyrrolidone (PVPK-90) lO%DMF
Solution 10 parts styrene/maleic acid copolymer (SMA 2000) 10% DMF solution
2 parts support 11 polyvinylpyrrolidone (PVPK-90) io%DMF
Solution 10 parts Styrene/maleic acid ester copolymer (SMA 2B25) 10% D
MF solution 4 parts 1 to 1 Polyvinylpyrrolidone (PVPK-90) 10% DMF
Solution 10 parts Styrene/maleic acid ester copolymer (S)IA 2E125) l
Note 2 parts of O% DMF solution; Oxirac 5H
-101 Molecular weight 9,000 Nippon Shokubai Chemical Co., Ltd. Oxirac 5H-201 Molecular weight 10,000 Nippon Shokubai Chemical Co., Ltd. SMA 2000 Molecular weight 1.700 Alco Chemical Asia Urn Hashific Ltd. SMA 2625 Molecular weight 1,900 Alco Chemical・Comparative Examples 1 to 3 manufactured by Asia Pacific Limited Comparison 1" Polyvinylpyrrolidone (PVPK-90, manufactured by GAF) 1
0 parts DMF 90 parts Comparison 1 Polyvinylpyrrolidone (PVPK-90, manufactured by GAF) (
10% aqueous solution) 50 parts Polyvinyl alcohol (PVA-217, manufactured by Kuraray) (10%
Aqueous solution) 50 parts Polyvinyl vinyl OIJ ton (PVPK-!30, GA
(manufactured by F) (10% DMF solution) 7
0 parts methyl vinyl ether/maleic anhydride monoethyl ester copolymer (GANTREZ ES-425, G
(manufactured by AF) (10% ethanol/DMF solution) 30 parts For the recording materials of the above examples and comparative examples, the following 4
On-demand inkjet recording head that uses seed ink to eject ink using a piezoelectric vibrator (discharge orifice diameter 60 m, piezoelectric vibrator drive voltage 70V)
, frequency 2 KHz).

Cheers! (Composition) C, 1, Direct Yellow 86 2 parts diethylene glycol 25 parts polyethylene glycol #200 15 parts water
60 parts L (composition) C, 1, Acid Red 35 2 parts diethylene glycol 25 parts polyethylene glycol #200 15 parts water
6o part 1e! (Composition) C, 1, Direct Blue 86 2 parts diethylene glycol 25 parts polyethylene glycol #200 15 parts water
60 parts Supervision 79C composition) C, 1, Food black 2 2 parts diethylene glycol 25 parts polyethylene glycol #2QO 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.

(L) 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 dries and no longer sticks to your finger. The time was measured.

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

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

(4) Linear transmittance was measured using a 323-type Hitachi self-recording spectrophotometer (manufactured by Hitachi - Seisho ■), keeping the distance from the sample to the light-receiving side at approximately 9C layer. , was determined using the above equation (1).

(5) II chemotaxis was performed under the conditions of 35°C and 85% R1 (
When the recording material was installed in the printer, it could not be moved by the feed roller of the printer due to stickiness on the surface of the ink-receiving layer and could not be recorded, and the recording material was rated "X", and those that were not recorded were rated "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 designated as O, and those in which no adhesion occurred were designated as X. 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, O.

(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 gel was rated as 0, and a case where no gel was formed was rated as ×.

(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 with water resistance were judged to be insoluble in water, and those that were not water resistant were judged as X.

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Claims (2)

[Claims] (1) In an inkjet recording material in which an ink-receiving layer is provided on a base material, the ink-receiving layer contains a polymer complex of a basic polymer and a styrene/maleic acid copolymer or an esterified product thereof. Characteristic recording material for inkjet. (2) The inkjet recording material according to claim (1), wherein the basic polymer is polyvinylpyrrolidone.