JPH05124330A - Material for recording - Google Patents

Abstract

PURPOSE:To obtain a material for recording having superior ink absorption, water-proofness, abrasion resistance and preservation stability as well as using water ink with gloss-giving properties by forming the ink-receptive layer of the material using a complex of an acid polymer and a crystalline pseudoboehmite or an amorphous cationic alumina hydrate. CONSTITUTION:The ink-receptive layer of a material for recording is formed using a complex of an acid polymer (e.g. carboxylic acid-modified PVA) and a crystalline pseudoboehmite or an amorphous cationic alumina hydrate (e.g. aluminazo). Consequently, it is possible to obtain a material for recording for recording equipment which has superior ink absorption, water-proofness, abrasion resistance and preservation stability as well as uses water ink with gloss-giving properties.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is particularly suitable for ink jet recording and the like which is excellent in ink absorbency, resolution, storage stability, scratch resistance and water resistance, and can obtain good gloss as required. Regarding recording material.

[0002]

2. Description of the Related Art Ink jet recording methods include various ink (recording liquid) ejection methods such as an electrostatic suction method, a method in which a piezoelectric element is used to mechanically vibrate or displace the ink, and the ink is heated to foam. By using the pressure, etc., small droplets of ink are generated and ejected, and some or all of them are attached to a recording material such as paper for recording. Printing, multicolor printing, etc. can be performed.

As the ink for ink jet recording, a water-based ink containing water as a main component is used from the viewpoint of safety and recording characteristics, and it is used to prevent clogging of an ink passage and an ink ejection port of an ink jet recording apparatus and to eject the ink. Polyhydric alcohols and the like are often added to improve stability.

As a recording material used for this ink jet recording, conventionally, a paper having a constitution in which various ink receiving layers are mounted on a base material called ordinary paper or ink jet recording paper has been used. With the improvement and spread of the performance of ink jet recording apparatuses such as high-speed recording and color image formation, recording materials are required to have higher and wider characteristics. For example, as a recording material for inkjet recording for obtaining a high-resolution, high-quality recorded image,
(1) Receiving the ink on the recording material as quickly as possible, (2) Even if ink dots overlap, ink that adheres later does not flow into dots that adhere before ( 3) The ink droplets are diffused on the recording material so that the diameter of the ink dot does not become larger than necessary. (4) The shape of the ink dot is close to a perfect circle and the circumference is smooth. 5) It is necessary to satisfy basic requirements such as high OD (optical density) of ink dots and smooth dot periphery.

Further, in order to obtain a high-resolution recording image quality comparable to that of a color photograph by the multicolor ink jet recording method, in addition to the required performance described above, (6) the coloring component of the ink coloring component is excellent in coloring property. That is, (7) since the same number of ink droplets as the number of ink colors may be adhered to the same place, the ink fixability is particularly excellent. (8) The surface is glossy, ( 9) Performances such as high whiteness are weighted and required.

The image recorded by the ink jet recording method has been conventionally used exclusively for observing the surface image, but with the improvement and spread of the performance of the ink jet recording apparatus, the image recorded for the purpose other than the observation of the surface image is used. Recording materials are being demanded. As applications other than surface image observation, those used for observing recorded images on a screen or the like with an optical device such as a slide or an OHP (overhead projector), and a positive plate for color printing. Examples of the color separation plate used in the preparation of C, CMF (color mosaic filter) used for a color display such as liquid crystal, and the like. When the recording material is used for surface image observation, diffused light of the recorded image is mainly observed, whereas the transmitted light becomes a problem in the recording material for these applications. Therefore, it is required that the material has excellent translucency, in particular, linear transmittance in consideration of the above-mentioned required talent.

[0007]

Many recording materials for surface image observation have a porous ink-receiving layer that absorbs ink and fixes recording components in the pores of the pores. It is not suitable for applications that require gloss in recorded images. On the other hand, when the surface of the ink receiving portion is non-porous, it is easy to obtain gloss, but since the ink absorbency is generally inferior to that of a porous material, it is Since non-volatile components such as alcohol remain on the surface for a long time, there is a drawback that the drying and fixing time of the ink is long, and when the printed image is contacted, the clothes are stained and the printed image is damaged. On the contrary,
There is known a method of increasing the ink absorptivity of a non-porous recording material by forming the ink receiving layer with a water-soluble polymer, but when the ink receiving layer is formed with a water-soluble polymer, the surface of the ink receiving layer is There is a problem that it gets sticky under high humidity conditions, so when it is attached to the printer it adheres to the feed roller etc. and the recording material cannot be conveyed well, and when it is stacked it causes blocking. .. Further, when a water-soluble polymer is used for the ink receiving layer, there is a problem that the ink receiving layer is inferior in water resistance or the surface of the ink receiving layer is easily scratched during transportation in a printer.

A recording material for ink-jet recording having an ink receiving layer formed of a polymer complex of a basic polymer and an acidic polymer for the purpose of improving water resistance and blocking resistance is disclosed in JP-A-61-188181.
It is disclosed in Japanese Patent Publication No. However, even when an ink receiving layer composed of this polymer complex is used, it cannot be said that the ink absorbency and fixing property are satisfactory, and it is suitable for use in the application of a large amount of ink such as the formation of high-quality images. It cannot be said that it can respond sufficiently.

On the other hand, in the recording material for ink jet recording, when the ink is adhered to the ink receiving layer, the ink adhering surface side may expand and curl. If the ink receiving layer is thick, the curling may occur. The occurrence becomes more prominent. Therefore, from the viewpoint of preventing curling, there is a demand for an ink receiving layer that can obtain good ink absorption and fixing even when formed thin.

The object of the present invention is to provide a recording material which is particularly excellent in ink absorbency, water resistance and sharpness of a recorded image and can obtain good gloss as needed, and is particularly suitable for ink jet recording. To do. Another object of the present invention is excellent in ink absorbency, sharpness of recorded image, surface gloss, scratch resistance, and water resistance, does not cause surface stickiness, blocking, etc. even under high humidity conditions, and is suitable for full-color recording. It is to provide a recording material that can be suitably used. Another object of the present invention is to observe a recorded image by projection on a screen or the like by an optical device such as a slide or OHP,
It is an object of the present invention to provide a recording material suitable for a color-separated plate when a positive plate for color printing is prepared, or for a purpose of utilizing transmission of CMF or the like used for a color display such as liquid crystal.

[0011]

The recording material of the present invention which can achieve the above object is a recording material for ink jet wherein a substrate has an ink receiving layer, wherein the ink receiving layer is acidic. It is characterized in that it contains a complex of a polymer and a crystalline alumina hydrate in which the crystalline form is pseudo-boehmite or amorphous.

The recording material of the present invention basically comprises a base material as a support and an ink receiving layer provided on the base material. The ink receiving layer has a recording surface to which ink adheres according to recording information. The ink receiving layer may also have a function as a base material, and if the ink receiving layer itself satisfies a predetermined strength and the like, a recording material is formed only from the ink receiving layer without using the base material. Can be formed.

In a preferred embodiment of the recording material of the present invention, (1) both the base material and the ink receiving layer are transparent, and the recording material as a whole is transparent, and (2) the ink. The surface of the receiving layer may be smooth and glossy.

The complex used in the ink receiving layer of the recording material of the present invention comprises an acidic polymer and a pseudo-boehmite or amorphous cationic alumina hydrate (hereinafter simply referred to as alumina hydrate) in crystalline form as described above. The above object can be achieved by constructing an ink receiving layer using this complex.

As the alumina hydrate, for example, the alumina sol described in JP-A-2-276670 can be used. In the present invention, by using alumina hydrate as a component of the complex, excellent ink absorbability and ink fixability can be obtained, and furthermore, since this is an inorganic substance, it is possible to combine an organic polymer with an acidic polymer. In comparison, there is an advantage that an ink receiving layer having high environmental stability can be obtained. When alumina sol is used, its particle form is preferably fibrous. When the ink receiving layer is formed only of alumina hydrate, the scratch resistance and water resistance are poor, and the image is easily damaged when it is conveyed in the printer, or the image is easily damaged by contact with water. Have problems such as. Therefore, in the present invention, it is possible to provide a recording material that can solve these problems and achieve the intended purpose by forming a complex by complexing an acidic polymer with alumina hydrate.

The acidic polymer used in the present invention has, for example, a sulfonic acid group, a carboxylic acid group, a sulfuric ester group in the molecule,
It is a polymer having a phosphoric acid ester group, a phenolic hydroxyl group, an alcoholic hydroxyl group, and the like, and the following can be exemplified. 1. Polymers Having Carboxylic Acid Group For example, a) polyvalent carboxylic acid such as citric acid, tartaric acid and phthalic acid, ethylene glycol, diethylene glycol, 1,
A polyester having a carboxyl group end obtained by reacting with a polyhydric alcohol such as 4-butanediol in an acid excess, b) an acidic cellulosic derivative modified with various polyvalent carboxylic acids (see Japanese Patent Publication No. 35-5093), c) Homopolymers such as vinyl ether ester monomers of polyvalent carboxylic acids, random copolymers with other common monomers, block copolymers, graft copolymers (see Japanese Patent Publication No. 35-8495), d. ) Homopolymers of acrylic acid or methacrylic acid monomers or random copolymers with other common monomers, block copolymers, graft copolymers, etc. e) α, such as maleic anhydride and itaconic acid, Homopolymers such as β-unsaturated vinyl monomers or random copolymers with other common monomers, block copolymers, polymers Preparative copolymer (Murahashi, Inoue, valleys, ed., Synthetic polymer (II
I), p250 to 257 and p374 to 380, see Asakura Shoten (1971)). 2. Polymers Having Sulfonic Acid Group For example, a) o-ethylcellulose hydrogen acetate hydrogensulfate phthalate, cellulose hydrogen acetate hydrogensulfate phthalate, ethylcellulose hydrogen-o-sulfobenzoate, op
-Cellulose derivatives such as sulfobenzyl cellulose acetate, o-ethyl-op-sulfoethyl cellulose acetate (see JP-B-35-5093), b) Sulfonic acid compounds of polyvinyl alcohol or vinyl alcohol copolymer (for example, , O-sulfobenzoic acid, sulfopropionic acid, sulfovaleric acid, sulfobenzaldehyde, sulfophthalic acid, etc.). 3. Polymer having a hydroxyl group, for example, a) ethyl cellulose, benzyl cellulose, hydroxyethyl cellulose, cellulose having a hydroxyethylated portion and an ethylated portion, cellulose having a hydroxyethylated portion and a benzylated portion, etc. B) a homopolymer of a monomer containing a sulfonic acid group or a phenol group or a random copolymer with another general monomer, a block copolymer, a graft copolymer, c) a carboxyl group, Examples thereof include acid-modified products of various polymers with sulfonic acid group- or phenol group-containing compounds. When the acidic polymer is reacted with alumina hydrate in a liquid medium, one that dissolves in the liquid medium used is used.

Despite the fact that the complex of alumina hydrate and acidic polymer used in the present invention has high hydrophilicity, the ink receiving layer formed from the complex has excellent water resistance and moisture resistance. In addition, it exhibits good ink absorbency, gives a clear image, and the surface thereof does not become tacky even under high humidity conditions.

Since this complex is insoluble in relatively poor solvents such as water, alcohols, esters, hydrocarbons, etc., these solutions are individually dissolved in a poor solvent and mixed to prepare a mixture of them. By reacting, the resulting complex can be precipitated and recovered. Further, the mixing ratio of the alumina hydrate and the acidic polymer in the formation of the complex depends on the kind of the acidic polymer used and the acid value, but the weight ratio is alumina hydrate / acidic polymer = 500/1 to 1/1 / It is preferable to prepare it within a range of about 5.

The ink receiving layer of the recording material of the present invention is formed by using the above-mentioned complex of alumina hydrate and acidic polymer. In addition to the complex, another polymer is used in combination to form the ink receiving layer. You may. Preferred examples of such a polymer include natural resins such as albumin, gelatin, casein, starch, cationic starch, gum arabic and sodium alginate;
Polyvinyl alcohol, polyamide, polyacrylamide, quaternized polyvinylpyrrolidone, polyethyleneimine, polyvinylpyridylium halide, melamine resin,
Examples thereof include synthetic resins such as polyurethane, polyester, and sodium polyacrylate, and one or more of these materials can be used in combination if desired. Since a translucent film can be formed from these resins, it can be suitably used when forming a translucent ink receiving layer. Further, a layer formed of these resins or alumina hydrate may be used as a lower layer of the ink receiving layer.

Further, in order to reinforce the strength of the ink receiving layer and / or improve the adhesion with the substrate, S may be added as necessary.
Resins such as BR latex, MBR latex, polyvinyl formal, polymethyl methacrylate, polyvinyl butyral, polyacrylonitrile, polyvinyl chloride, polyvinyl acetate, phenol resin and alkyd resin may be used in combination.

Further, the ink receiving layer may further contain a dispersant, a fluorescent dye, a pH adjusting agent, a defoaming agent, a lubricant, if necessary.
Various known additives such as preservatives and surfactants may be contained.

As the base material used as the support of the ink receiving layer in the present invention, any conventionally known base material can be used without particular limitation. Suitable examples of the translucent base material include, for example, polyester resin, diacetate resin, triacetate resin, acrylic resin, polycarbonate resin, polyvinyl chloride resin, polyimide resin, cellophane, celluloid, etc. Examples thereof include films and plates made of the above materials, and glass plates. Further, as a preferable substrate used when it is not required to be translucent, for example, a sheet or plate made of general paper, synthetic paper, cloth, wood, metal, etc., and the above-mentioned translucent substrate. And the like, which have been opaque-treated by a known means.

The recording material of the present invention comprises: A) a coating solution prepared by dissolving or dispersing at least one of the above complexes and various resins and additives as necessary in a suitable solvent. A method in which a working solution is coated on a substrate by a known method such as a roll coating method, a rod bar coating method, a spray coating method, an air knife coating method, and then quickly dried, B) Alumina hydrate Prepare a solution and a solution of acidic polymer separately, coat one of them on the substrate, then coat the other on it, and let them react on the substrate A method of forming a layer of a complex, C) a method of hot-melt coating a mixture of one or more of the above-mentioned complexes with various resins and additives as required, D) a method of A to C on the substrate It is possible to form a film for an ink receiving layer using a method or the like, and to laminate the film on a desired substrate.

In the present invention, when a translucent ink receiving layer is laminated on a translucent substrate to form a translucent recording material, excellent translucency is obtained as the entire recording material. It is particularly suitable for use in an OHP or the like for projecting a recorded image on a screen or the like by an optical device, and is useful as a recording material for transmitted light observation. The term "translucency" as used in the present invention means that the haze of the recording material is 50% or less, preferably 20% or less. The haze is a translucent index indicating how much visible light is scattered when visible light is incident on the recording material. When the haze is 50% or less, the recorded image can be projected on the screen or the like by the OHP, and the details of the projected recorded image can be clearly observed.

According to the constitution of the recording material of the present invention, the surface of the ink receiving layer can be provided with gloss, and in such a case, a recorded image having excellent sharpness (a surface image for observing reflected light) can be obtained. In particular, it is suitable for forming a clear full-color image. The recording material in this case may be translucent or not. Further, in the formation of the recording material having the gloss, when the light transmissive property is not required, the ink receptive layer transmits the above-mentioned filler in the light transmissive layer within a range in which the surface smoothness of the ink receptive layer can be maintained. It may be used to the extent that it loses sex. Further, at the time of forming the ink receiving layer, a cast coating method may be used or a gloss roll may be used for glossing, if necessary.

The thickness of the ink receiving layer in the recording material of the present invention is not particularly limited, but is, for example, 0.1 to 100 μm.
The thickness may be about 0.5 to 50 μm, more preferably about 1 to 20 μm. It should be noted that, from the viewpoint of preventing curl after forming a recorded image, it is preferable to form the film as thin as possible. Further, 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 having the above constitution is
It has superior ink absorbency to a recording material having an ink receiving layer formed of a conventional water-soluble polymer, can provide a recorded image with excellent sharpness, and its surface becomes tacky even under high humidity conditions, There is no stickiness, and no sticking or blocking occurs inside the printer during transportation in the printer. Further, the ink receiving layer can be formed thinner without impairing these characteristics. Further, since it is also excellent in scratch resistance and water resistance, scratches and damages are less likely to occur on a recorded image during transportation in the printer and various handlings. Therefore, in addition to mono-color images, even when inks of different colors are repeatedly attached to the same place in a short time during full-color image recording, there is no ink bleeding or bleeding phenomenon, and a high-resolution clear image is obtained. An image is obtained. Moreover, as described above, since the ink receiving layer of the recording material of the present invention does not become sticky or sticky even under high humidity conditions, unlike conventional recording materials using water-soluble polymers, it is It can also be applied to records.

On the other hand, by using the constitution of the recording material of the present invention, it is possible to provide a vivid surface gloss which is difficult to be achieved by the conventional recording material, and it is possible to obtain a glossy and clear image. In particular, it is suitable for forming a full-color image. Further, by imparting translucency to the recording material of the present invention, a recorded image is observed by projection onto a screen or the like by an optical device such as a slide or an OHP, and a color when a positive plate for color printing is prepared. It is possible to provide a recording material suitable for use in a disassembled version or in the use of transmission such as CMF used for a color display such as liquid crystal.

The case where the recording material of the present invention is mainly used for ink jet recording has been described above. However, the recording material of the present invention is not limited to ink jet recording, but various writing instruments and pen plotters using water-based ink. It can be suitably used for recording by a recording device such as.

[0030]

The present invention will be described in more detail with reference to Examples and Comparative Examples. Example 1 90 parts by weight of alumina sol (trade name: alumina sol-100, manufactured by Nissan Chemical Industries, Ltd., solid content: 10% by weight, aqueous dispersion colloidal solution of cationic alumina hydrate having an amorphous crystal form), and carboxylic acid modification Polyvinyl alcohol KL-3
10 parts by weight of 18 (manufactured by Kuraray Co., Ltd.) aqueous solution was mixed, and when these complexes were formed and the solution gelled, 100 parts by weight of water was added thereto, and the mixture was vigorously stirred to disperse the complex. The solution was obtained as a coating liquid.

A 100 μm thick polyethylene terephthalate film (Lumirror T-manufactured by Toray) as a light-transmitting substrate.
100), the above coating solution was applied to this film by a bar coater method so that the film thickness after drying was 5 μm, and the film was dried at 110 ° C. for 5 minutes to obtain the light-transmitting property of the present invention. A recording material was obtained.

Example 2 95 parts by weight of the alumina sol used in Example 1 and 1 part of polyacrylic acid (Jurimer AC10LP, manufactured by Nippon Pure Chemical Co., Ltd.)
When 5 parts by weight of a 0% by weight aqueous solution were mixed, and when these complexes were formed and the solution gelled, 70 parts by weight of isopropyl alcohol was added thereto, and the mixture was vigorously stirred, and the dispersion liquid of the complex was used as a coating liquid. Obtained. Thereafter, in the same manner as in Example 1, this coating liquid was applied onto a translucent substrate and dried to obtain the translucent recording material of the present invention.

Example 3 93 parts by weight of the alumina sol used in Example 1 and a copolymer of methyl vinyl ether and maleic anhydride (GANT)
REZ AN-169, manufactured by GAF) was mixed with 7 parts by weight of a 10% by weight aqueous solution, and when these complexes were formed and the solution gelled, 50 parts by weight of isopropyl alcohol was added thereto, and the mixture was vigorously stirred to form a complex. A dispersion solution of was obtained as a coating liquid. Thereafter, in the same manner as in Example 1, this coating liquid was applied onto a translucent substrate and dried to obtain the translucent recording material of the present invention.

Example 4 80 parts by weight of the alumina sol used in Example 1 and polyethyleneoxydiglycolic acid (PEO acid No. 4000,
20% of 10 wt% aqueous solution of Kawaken Fine Chemical Co., Ltd.)
By mixing 1 part by weight, when these complexes were formed and the solution gelled, 100 parts by weight of water was added thereto and stirred vigorously to obtain a dispersion solution of the complex as a coating liquid. Thereafter, in the same manner as in Example 1, this coating liquid was applied onto a translucent substrate and dried to obtain the translucent recording material of the present invention.

EXAMPLE 5 85 parts by weight of alumina sol (Cataloid AS-2, manufactured by Catalysts & Chemicals Industry Co., Ltd., solid content 10% by weight, aqueous dispersion colloidal solution of cationic alumina hydrate having pseudo boehmite crystal form) 15 parts by weight of a 10% by weight aqueous solution of the carboxylic acid-modified polyvinyl alcohol used in Example 1 was mixed, and when these complexes were formed and the solution gelled, 100 parts by weight of water was added thereto and stirred vigorously, A dispersion solution of the complex was obtained as a coating liquid. Thereafter, in the same manner as in Example 1, this coating liquid was applied onto a translucent substrate,
It was dried to obtain the translucent recording material of the present invention.

Comparative Example 1 A coating liquid was prepared in the same manner as in Example 1 except that 50 parts by weight of the alumina sol used in Example 1 and 10 parts by weight of a 10% aqueous solution of polyvinyl alcohol (PVA-217, manufactured by Kuraray) were used. Was prepared, coated on a translucent substrate, and dried to obtain a translucent recording material.

Comparative Example 2 Polyvinylpyrrolidone 10% by weight aqueous solution (PVPK-
0, manufactured by GAF) and 34 parts by weight of a 10% by weight aqueous solution of the copolymer of methyl vinyl ether and maleic anhydride used in Example 3 are mixed to form a complex and the solution is gelled. By the way, 10
0 part of N, N-dimethylformamide was added and heated to 90 ° C. to form a solution to obtain a coating solution. Next, this coating solution was applied onto the polyethylene terephthalate film used in Example 1 by a bar coater method so that the film thickness after drying would be 8 μm, and dried at 80 ° C. for 10 minutes, A translucent recording material was obtained.

Comparative Example 3 Example 1 except that only the alumina sol was directly coated on the substrate.
A translucent recording material was obtained in the same manner as.

Evaluation Test Each of the recording materials obtained in the above Examples and Comparative Examples was subjected to inkjet recording under the following conditions, and then evaluated for the following evaluation items. The results are shown in Table 1. Ejection method; Ink bubbling by thermal energy Volume of ejected droplets; 30 pl Ejection frequency; 2 kHz Recording density; 16 pel Maximum single color ink application amount; 7.4 nl / mm per color
² Maximum number of color overlaps; 3 colors Maximum ink application amount; 22.2 nl / mm ² Ink composition used Yellow ink C.I. I. Acid Yellow 23 3% by weight Diethylene glycol 30% by weight Water 67% by weight Cyan ink C.I. I. Direct Blue 86 3% by weight Diethylene glycol 30% by weight Water 67% by weight Magenta ink C.I. I. Acid Red 35 3% by weight Diethylene glycol 30% by weight Water 67% by weight Black ink C.I. I. Direct black 19 3% by weight Diethylene glycol 30% by weight Water 67% by weight Evaluation items (1) Ink absorbency After recording three colors of yellow, cyan and magenta in full dots, 30 at room temperature (20 ° C, 65% RH) After left for a second, when the recorded image was touched with a finger, it was judged whether or not the ink was taken into the inside of the ink receiving layer and did not adhere to the finger. When there was no adhesion, it was evaluated as ◯, when it was adhered as ×, and the middle thereof was evaluated as Δ. (2) Blocking resistance After recording three colors of yellow, cyan, and magenta in full dots, warm air (100 ° C, wind speed 1 m / sec) is applied to the recording surface for 1 time.
After applying for 0 seconds, a clear pocket (made by Lion, polypropylene film) is applied to the recorded image with a pressure of 40 g / cm ^2.
It was judged whether or not this film could be easily peeled off when laminated. The case where it can be easily peeled off was marked with ○, and the case where a considerable force was required for peeling was marked with ×, and the middle thereof was marked with Δ. (3) Water resistance The recording material was allowed to stand in still water for 1 day, and there was almost no change ◯, when the ink receiving layer had obvious swelling Δ, and when the ink receiving layer was dissolved. It was set to x. (4) Resolution The recorded image is projected on the screen by OHP, and a high-contrast, clear and easy-to-see image is obtained. When the line with a thickness of 0.3 mm could not be clearly discriminated, the mark was X, and the middle thereof was marked with Δ. (5) Scratch resistance After recording three colors of yellow, cyan, and magenta on full dots and leaving them at room temperature (20 ° C, 65% RH) for 20 minutes, place 40 g of fine paper on the recorded image surface. / Cm ²
The surface of the recorded image was rubbed with the pressure. When there was no change at all, it was evaluated as ◯, when the recorded image surface had obvious scratches, as ×, and when slightly damaged, it was evaluated as Δ. (6) Storage stability After recording three colors of yellow, cyan, and magenta on full dots and leaving them for 2 weeks under the conditions of 30 ° C. and 80% RH, the resolution was evaluated according to the above item (4). I did.

[0040]

[Table 1]

[0041]

EFFECTS OF THE INVENTION The recording material of the present invention uses the complex of an acidic polymer and a cationic alumina hydrate whose crystal form is pseudo-boehmite or amorphous for the formation of the ink receiving layer, and thus the ink absorbency, It is excellent in water resistance, scratch resistance, and storage stability, and is suitable for recording by recording equipment such as various writing tools and pen plotters that use water-based ink, and particularly suitable for inkjet recording. Also, it is possible to obtain surface gloss without impairing these characteristics,
A clear image can be provided.

Claims (1)

[Claims] 1. A recording material having an ink receiving layer, wherein the ink receiving layer contains a complex of an acidic polymer and a cationic alumina hydrate having a pseudo-boehmite or amorphous crystalline form. Recording material.