JP2001191639A - Ink-jet recording material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink-jet recording material with photo-like high luster, high ink absorbing properties and improved storing properties. SOLUTION: In the ink-jet recording material provided with an ink receiving layer containing mainly a silica prepared by a gas phase method on a substrate, the ink-jet recording material is incorporated with a compound 1 of the below described formula 1 in the ink receiving layer (wherein R is a substitutable group except hydroxyl group and m is 0 or 1 and n is an integer of 0, 1, 2 or 3).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink-jet recording material, and more particularly to an ink-jet recording material having high photo-like gloss, excellent ink absorbency, and improved storage stability after printing. It is.

[0002]

2. Description of the Related Art As a recording material used in an ink jet recording system, a pigment such as amorphous silica is coated on a support called a normal paper or an ink jet recording paper by a porous material comprising a water-soluble binder such as polyvinyl alcohol. There is known a recording material provided with an ink absorbing layer.

[0003] For example, Japanese Patent Application Laid-Open No. 55-51583,
Nos. 6-157, 57-107879, 57-10
No. 7880, No. 59-230787, No. 62-160
No. 277, No. 62-184879, No. 62-1833
As disclosed in JP-A-82 and JP-A-64-11877, a recording material obtained by applying a silicon-containing pigment such as silica to a paper support together with an aqueous binder has been proposed.

[0004] Also, Japanese Patent Publication No. 3-56552,
No. 188287, No. 10-81064, No. 10
-119423, 10-175365, 1
Nos. 0-193776, 10-203006, 10
-217601, 11-20300, 11
Japanese Patent Publication Nos. -20306 and 11-34481 disclose the use of vapor-phase synthetic silica fine particles (hereinafter referred to as fumed silica). This fumed silica is an ultrafine particle having an average primary particle diameter of several nm to several tens nm, and is characterized in that high gloss is obtained.
In recent years, with the demand for photo-like recording sheets, glossiness has been increasingly emphasized, and water resistance of polyolefin resin-coated paper (a laminate of a polyolefin resin such as polyethylene on both sides of paper) and polyester film There has been proposed a recording material in which an ink receiving layer mainly composed of fumed silica is provided on a support.

Conventionally, a paper support generally used itself has a role as an ink absorbing layer. However, a water-resistant support such as the above-mentioned polyolefin resin-coated paper is a paper support. Unlike the above, ink cannot be absorbed, so that the ink absorbing property of the ink receiving layer provided on the support is important, and it is necessary to increase the void volume of the ink receiving layer. Therefore, it was necessary to increase the content of fumed silica and further reduce the ratio of binder to fumed silica in order to increase the porosity.

A recording material using the above-mentioned fumed silica has a problem that a printed image is liable to be discolored during storage after printing. That is, discoloration due to light and discoloration due to a trace amount of gas in the air were likely to occur. In particular, discoloration due to trace gases in the atmosphere was serious. Also, these issues
It has been found that this is likely to occur when the binder amount is reduced in order to increase the ink absorption.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an ink-jet recording material having improved photo-like high gloss, high ink absorption and storage stability.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to provide an ink jet recording material comprising an ink receiving layer mainly containing fumed silica on a support, wherein the ink receiving layer comprises This has been attained by an ink jet recording material characterized by containing

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
In the ink jet recording material of the present invention, the ink is absorbed in the voids formed in the film by the silica fine particles, and it is necessary to increase the void volume in order to exhibit high ink absorbency. For this reason, it is necessary to contain a relatively large amount of silica fine particles, and the amount of the hydrophilic binder is preferably reduced to fill the voids.

In the present invention, the fumed silica preferably contains at least 8 g / m ^{2 in the} ink receiving layer.
More preferably, it is used in the range of 30 g / m ² . If the amount is less than this range, the ink absorbency is poor. The amount of the hydrophilic binder is preferably 30% by weight or less, more preferably 10 to 30% by weight, based on the fumed silica. By reducing the ratio of the hydrophilic binder as described above, the ink absorbency is improved, but the storage stability after printing, particularly the gas resistance, tends to decrease, and the present invention is intended to simultaneously satisfy these performances. Features.

In the present invention, the phrase "predominantly containing fumed silica in the ink receiving layer" means that the fumed silica is 50% by weight or more, preferably 60% by weight, based on the total solid content of the ink receiving layer.
%, More preferably 65% by weight or more.

Synthetic silica includes those obtained by a wet method and those obtained by a gas phase method. The present invention is characterized by using synthetic silica by a gas phase method. Usually, silica fine particles often refer to wet process silica. As the wet process silica, silica sol obtained by double decomposition with an acid or the like of sodium silicate or an ion exchange resin layer, or colloidal silica obtained by heating and aging this silica sol,
The silica sol is gelled and the formation conditions are changed to change silica gel, where the primary particles of several microns to 10 microns become siloxane-bonded three-dimensional secondary particles, furthermore silica sol, sodium silicate, sodium aluminate Synthetic silicate compounds mainly composed of silicic acid, such as those obtained by heating and producing the like.

The fumed silica is also called a dry method as opposed to a wet method, and is generally produced by a flame hydrolysis method. Specifically, a method of making silicon tetrachloride by burning it with hydrogen and oxygen is generally known, but instead of silicon tetrachloride, silanes such as methyltrichlorosilane and trichlorosilane may be used alone or in a silicon tetrachloride. And can be used in a mixed state. The fumed silica is Aerosil from Nippon Aerosil Co., Ltd. and Q from Tokuyama Co., Ltd.
It is commercially available as the S type and can be obtained.

The average particle diameter of the primary particles of the fumed silica used in the present invention is preferably 30 nm or less, and in order to obtain higher gloss, the specific surface area by the BET method at 3 to 15 nm is 200 m ² / g or more. Is preferred. More preferably, the average particle size of the primary particles is 3 to 10 nm and the specific surface area by the BET method is 250 m ² / g or more (preferably 250 to 50
0 m ² / g). B in the present invention
The ET method is one of the methods for measuring the surface area of a powder by a gas phase adsorption method.
That is, this is a method for determining the specific surface area. Usually, nitrogen gas is often used as the adsorbed gas, and the method of measuring the amount of adsorption from the change in pressure or volume of the gas to be adsorbed is most often used. The most prominent for expressing the isotherms of multimolecular adsorption is the Brunauer, Emmett, Teller equation, which is the BET
It is called a formula and is widely used to determine the surface area. The surface area is obtained by calculating the amount of adsorption based on the BET formula and multiplying the area occupied by one adsorbed molecule on the surface.

In the present invention, as the hydrophilic binder used together with the fumed silica, various known binders can be used, but a hydrophilic binder which has high transparency and can obtain higher ink permeability is preferably used. Can be In the use of the hydrophilic binder, it is important that the hydrophilic binder does not swell at the initial penetration of the ink and does not close the voids.From this viewpoint, a hydrophilic binder having a relatively low swelling property at around room temperature is preferable. Used. Particularly preferred hydrophilic binders are fully or partially saponified polyvinyl alcohols or cationically modified polyvinyl alcohols.

Particularly preferred among polyvinyl alcohols are those partially or completely saponified with a saponification degree of 80 or more. Those having an average polymerization degree of 200 to 5000 are preferred.

As the cation-modified polyvinyl alcohol, for example, as described in JP-A-61-10483, a primary to tertiary amino group or a quaternary ammonium group is added to the main chain or side chain of polyvinyl alcohol. It is a polyvinyl alcohol contained therein.

In the present invention, it is preferable to use a crosslinking agent (hardening agent) together with the hydrophilic binder. Specific examples of the crosslinking agent include aldehyde compounds such as formaldehyde and glutaraldehyde, ketone compounds such as diacetyl and chloropentanedione, bis (2-chloroethylurea) -2-hydroxy-4,6-dichloro-1,
3,5 Triazine, a compound having a reactive halogen as described in U.S. Pat. No. 3,288,775, divinyl sulfone, a compound having a reactive olefin as described in U.S. Pat. No. 3,635,718, U.S. Pat. 2nd, 73
N-methylol compounds as described in U.S. Pat. No. 2,316, isocyanates as described in U.S. Pat. No. 3,103,437, U.S. Pat. Nos. 3,017,280 and 2,983,
611, carbodiimide compounds as described in U.S. Pat. No. 3,100,704, epoxy compounds as described in U.S. Pat. No. 3,091,537, halogen carboxaldehydes such as mucochloric acid, There are dioxane derivatives such as dihydroxydioxane, and inorganic crosslinking agents such as chromium alum, zirconium sulfate, boric acid and borate, and these can be used alone or in combination of two or more. Among these, boric acid or borate is particularly preferred.

[0019] The present invention relates to a method for producing a fumed silica,
By containing the compound of the above formula 1, the storage stability after printing is remarkably improved. Hereinafter, the compound of Formula 1 will be described in detail.

In formula 1, R represents a substitutable group excluding a hydroxy group. Examples include an alkyl group, an alkenyl group, an alkoxy group, an acyl group, an amino group, a nitro group, a mercapto group, and a halogen atom. m represents an integer of 0 or 1, and n represents an integer of 0, 1, 2 or 3. When n is 2 or 3, R may be the same or different.

The alkyl, alkenyl, alkoxy and acyl groups as the substituent are preferably lower ones having 4 or less carbon atoms. The amino group includes a secondary or tertiary amino group which is unsubstituted or substituted with a lower alkyl group. Specific compounds are shown below.

Specific examples of chemical formula 1 include benzoic acid, 2-methylbenzoic acid, 4-methylbenzoic acid, p-anisic acid,
Chlorobenzoic acid, 2,6-dichlorobenzoic acid, 2,3-
Dimethylbenzoic acid, 2,3-dimethoxybenzoic acid, 4-
Nitrobenzoic acid, thiosalicylic acid, salicylic acid, 4-methylsalicylic acid, 5-methoxysalicylic acid, 5-aminosalicylic acid, 5-bromosalicylic acid, 2-hydroxy-
5-nitrobenzoic acid and the like. Among the above compounds, benzoic acid and salicylic acid are particularly preferably used.

The content of the above compound in the ink receiving layer is preferably 0.1 to 50 mmol / m ² ,
20 mmol / m ² is more preferable.

The ink receiving layer of the present invention preferably contains a cationic compound. By using the above compound and a cationic compound in combination, the storage stability is further improved.

Examples of the cationic compound include a cationic polymer and a water-soluble metal compound. Examples of the cationic polymer include polyethyleneimine, polydiallylamine, polyallylamine, and alkylamine polymers, JP-A-59-20696 and JP-A-59-33176.
No. 59-33177, No. 59-155088,
No. 60-11389, No. 60-49990, No. 60
No. 83882, No. 60-109894, No. 62-1
Nos. 98493, 63-49478, 63-115
780, 63-280681, JP-A-1-403
No. 71, No. 6-234268, No. 7-125411
Nos. 1 to 3 described in JP-A-10-193776 and the like.
A polymer having a quaternary amino group and a quaternary ammonium group is preferably used. The molecular weight of these cationic polymers is preferably 5,000 or more, and more preferably 5,000 to 1
About 100,000 is preferable.

The amount of the cationic polymer used is 1 to 10% by weight, preferably 2 to 7% by weight, based on fumed silica.
% By weight.

The water-soluble metal compound used in the present invention includes, for example, water-soluble polyvalent metal salts. Water-soluble salts of metals selected from calcium, barium, manganese, copper, cobalt, nickel, aluminum, iron, zinc, zirconium, chromium, magnesium, tungsten, and molybdenum. Specifically, for example, calcium acetate, calcium chloride, calcium formate, calcium sulfate, barium acetate, barium sulfate, barium phosphate, manganese chloride, manganese acetate, manganese formate dihydrate, manganese ammonium sulfate hexahydrate, chlorinated chloride Cupric, ammonium copper (II) chloride dihydrate, copper sulfate, cobalt chloride,
Cobalt thiocyanate, cobalt sulfate, nickel sulfate hexahydrate, nickel chloride hexahydrate, nickel acetate tetrahydrate, nickel ammonium sulfate hexahydrate, nickel amidosulfate tetrahydrate, aluminum sulfate, aluminum sulfite, Aluminum thiosulfate, poly aluminum chloride, aluminum nitrate nonahydrate, aluminum chloride hexahydrate,
Ferrous bromide, ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, zinc bromide, zinc chloride, zinc nitrate hexahydrate, zinc sulfate, zirconium acetate, zirconium chloride, chloride Zirconium oxide octahydrate, zirconium hydroxychloride, chromium acetate, chromium sulfate, magnesium sulfate, magnesium chloride hexahydrate, magnesium citrate nonahydrate, sodium phosphotungstate, sodium tungsten citrate, 12 tungstophosphate n Hydrate, 12-tungstosilicic acid 26-hydrate, molybdenum chloride, 12-molybdophosphate n-hydrate and the like.

In the present invention, a water-soluble aluminum compound or a water-soluble compound containing a Group 4A element in the periodic table is particularly preferable. As the water-soluble aluminum compound, for example, as an inorganic salt, aluminum chloride or a hydrate thereof, aluminum sulfate or a hydrate thereof, ammonium alum and the like are known. Further, there is a basic polyaluminum hydroxide compound which is an inorganic aluminum-containing cationic polymer. Particularly, a basic polyaluminum hydroxide compound is preferable.

The basic polyaluminum hydroxide compound has a main component represented by the following general formula 1, 2 or 3, for example, [Al ₆ (OH) ₁₅ ] ³⁺ , [Al ₈ (OH) ₂₀ ] ⁴⁺ ,
It is a water-soluble polyaluminum hydroxide stably containing basic and high-molecular polynuclear condensed ions such as [Al ₁₃ (OH) ₃₄ ] ⁵⁺ , [Al ₂₁ (OH) ₆₀ ] ³⁺ , and the like. .

[Al ₂ (OH) _n Cl _6-n ] _m Formula 1 [Al (OH) ₃ ] _n AlCl ₃ Formula 2 Al _n (OH) _m Cl _(3n-m) 0 <m <3n Formula 3

These are water treatment agents under the name of polyaluminum chloride (PAC) from Taki Kagaku Co., Ltd., and polyaluminum hydroxide (Paho) from Asada Kagaku Co., Ltd. It is marketed by RIKEN GREEN under the name Purachem WT and from other manufacturers for the same purpose, and various grades are readily available. In the present invention, these commercial products can be used as they are,
Some substances have an inappropriately low pH, and in such a case, the pH can be appropriately adjusted and used.

The water-soluble compound containing a Group 4A element in the periodic table used in the present invention is not particularly limited as long as it is water-soluble, but a water-soluble compound containing titanium or zirconium is preferable.
For example, as a water-soluble compound containing titanium, titanium chloride,
Titanium sulfate is a water-soluble compound containing zirconium as zirconium acetate, zirconium chloride, zirconium oxychloride, zirconium hydroxychloride, zirconium nitrate, basic zirconium carbonate, zirconium hydroxide, zirconium ammonium carbonate, zirconium potassium carbonate, zirconium sulfate And zirconium fluoride compounds are known. Some of these compounds have an inappropriately low pH. In such a case, the pH can be appropriately adjusted and used. In the present invention, the term "water-soluble" refers to a condition in which 1% by weight or more is dissolved in water at normal temperature and normal pressure.

In the present invention, the content of the water-soluble metal compound in the ink receiving layer is preferably 0.1 to 10% by weight, more preferably 1 to 5% by weight, based on the fumed silica.
% By weight.

Two or more of the above-mentioned cationic compounds can be used in combination. For example, it is preferable to use a cationic polymer and a water-soluble metal compound in combination.

In the present invention, the pH of the film surface of the ink receiving layer containing fumed silica is preferably from 2 to 6, particularly preferably from 3 to 5. By combining the above-described compound of the general formula 1 with the film surface pH, the storage stability is further improved. The pH of the surface of the ink receiving layer is determined by the method described in J. Org. TAPP
According to the method described in I Paper Pulp Test Method N0.49,
This is the surface pH measured after 30 seconds using distilled water.

The pH of the ink receiving layer is preferably adjusted at the stage of the coating solution. However, since the pH of the coating solution does not always coincide with the pH of the film surface after the coating and drying, the coating solution and the film surface may not be adjusted. It is necessary to determine the relationship with pH in advance by experiments or the like in order to obtain a predetermined film surface pH. The pH of the ink receiving layer coating solution is adjusted by appropriately combining an acid or an alkali. Examples of the acid include inorganic acids such as hydrochloric acid, nitric acid, sulfuric acid, and phosphoric acid, and organic acids such as acetic acid, citric acid, and succinic acid. Examples of the alkali include sodium hydroxide, ammonia water, potassium carbonate, and trisodium phosphate. Alternatively, as the weak alkali, an alkali metal salt of a weak acid such as sodium acetate is used.

The ink receiving layer of the present invention may contain various oil droplets for further improving the brittleness of the film.
Such oil droplets include hydrophobic high-boiling organic solvents having a solubility in water at room temperature of 0.01% by weight or less (for example, liquid paraffin, dioctyl phthalate, tricresyl phosphate, silicone oil, etc.) and polymer particles ( For example, particles obtained by polymerizing one or more polymerizable monomers such as styrene, butyl acrylate, divinylbenzene, butyl methacrylate, and hydroxyethyl methacrylate) can be contained. Such oil droplets can be preferably used in the range of 10 to 50% by weight based on the hydrophilic binder.

In the present invention, a surfactant can be added to the ink receiving layer. The surfactant used may be any of anionic, cationic, nonionic and betaine types, and may be of low molecular weight or high molecular weight. One or two or more surfactants are added to the ink receiving layer coating solution. When two or more surfactants are used in combination, an anionic surfactant and a cationic surfactant are used in combination. It is not preferable. The addition amount of the surfactant is preferably 0.001 to 5 g with respect to 100 g of the binder constituting the ink receiving layer,
More preferably, it is 0.01 to 3 g.

In the present invention, the ink receiving layer further comprises:
Publicly known coloring dyes, coloring pigments, fixing agents for ink dyes, ultraviolet absorbers, antioxidants, pigment dispersants, defoamers, leveling agents, preservatives, fluorescent brighteners, viscosity stabilizers, pH regulators, etc. Can be added.

The support used in the present invention is preferably a water-resistant support. As the water-resistant support, a polyester resin such as polyethylene terephthalate, a diacetate resin, a triacetate resin, an acrylic resin, a polycarbonate resin, a polyvinyl chloride, a polyimide resin, a plastic resin film such as cellophane and celluloid, and a polyolefin resin on both sides of paper And resin-coated paper laminated with The thickness of the water-resistant support used in the present invention is preferably about 50 to 300 μm.

The base paper constituting the resin-coated paper preferably used in the present invention is not particularly limited, and generally used paper can be used. More preferably, for example, a smooth paper such as used for a photographic support is used. Base paper is preferred. As the pulp constituting the base paper, natural pulp, recycled pulp, synthetic pulp or the like may be used alone or in combination of two or more. This base paper contains sizing agents, paper strength agents, fillers, antistatic agents, fluorescent whitening agents,
Additives such as dyes are blended.

Further, a surface sizing agent, a surface paper strengthening agent, a fluorescent whitening agent, an antistatic agent, a dye, an anchoring agent and the like may be coated on the surface.

The thickness of the base paper is not particularly limited. However, it is preferable that the base paper has good surface smoothness such as by applying a pressure by using a calender or the like during or after papermaking, and the basis weight is 30%. ~250g / m ² is preferred.

As the resin of the resin-coated paper, a polyolefin resin or a resin curable by an electron beam can be used.
The polyolefin resin is a low-density polyethylene, high-density polyethylene, polypropylene, polybutene, a homopolymer of an olefin such as polypentene or a copolymer of two or more olefins such as an ethylene-propylene copolymer and a mixture thereof, Those having various densities and melt viscosity indices (melt index) can be used alone or in combination.

In the resin of the resin-coated paper, white pigments such as titanium oxide, zinc oxide, talc and calcium carbonate, fatty acid amides such as stearamide, arachidic amide, zinc stearate, calcium stearate, stearic acid Aluminum, metal salts of fatty acids such as magnesium stearate, antioxidants such as Irganox 1010 and Irganox 1076, blue pigments and dyes such as cobalt blue, ultramarine blue, cecilian blue, and phthalocyanine blue, cobalt violet, fast violet, and manganese purple It is preferable to add various additives such as magenta pigments and dyes, fluorescent brighteners and ultraviolet absorbers in an appropriate combination.

The resin-coated paper, which is preferably used in the present invention, is produced by a so-called extrusion coating method in which, in the case of a polyolefin resin, a heat-melted resin is cast on a running base paper, both sides of which are made of resin. Coated. In the case of a resin that is cured by an electron beam, the resin is applied by a commonly used coater such as a gravure coater or a blade coater, and then irradiated with an electron beam to cure and coat the resin. Further, before coating the resin on the base paper, the base paper is preferably subjected to an activation treatment such as a corona discharge treatment or a flame treatment. The surface (surface) of the support on which the ink receiving layer is applied has a glossy surface, a matte surface, and the like, depending on the application, and the glossy surface is used particularly advantageously. It is not necessary to coat the back surface with a resin, but it is preferable to coat the resin from the viewpoint of curling prevention. The back surface is usually a matte surface, and the front surface or both front and back surfaces can be subjected to an activation treatment such as a corona discharge treatment or a flame treatment as required. The thickness of the resin coating layer is not particularly limited, but is generally 5 to 50 μm thick on the surface or on both sides.

The support in the present invention may be coated with various back coat layers for antistatic properties, transport properties, curling prevention properties, and the like. The back coat layer can contain an inorganic antistatic agent, an organic antistatic agent, a hydrophilic binder, a latex, a curing agent, a pigment, a surfactant and the like in an appropriate combination.

In the present invention, the method for applying the ink receiving layer is not particularly limited, and a known coating method can be used. For example, there are a slide lip system, a curtain system, an extrusion system, an air knife system, a roll coating system, a rod bar coating system, and the like.

In the present invention, the ink jet recording material may be provided with an ink absorbing layer, an ink fixing layer, an intermediate layer, a protective layer and the like in addition to the layer containing fumed silica. For example, a water-soluble polymer layer may be provided as a lower layer, or a swelling layer may be provided as an upper layer.

[0050]

EXAMPLES The present invention will be described below in detail with reference to examples, but the contents of the present invention are not limited to the examples. In addition, a part means a solid content weight part.

Example 1 As supports, LBKP (50 parts) and LBSP (50 parts) were used.
Part) of a pulp blend of 120 g / m ² , and a resin composition composed of low-density polyethylene (70 parts), high-density polyethylene (20 parts) and titanium oxide (10 parts) applied to the surface at 25 g / m ^2. And high-density polyethylene (5
0 parts) and a low-density polyethylene (50 parts) resin coating paper prepared by applying 25 g / m ² .

A coating solution of the ink receiving layer having the following composition was prepared on the above support, and the coating amount of fumed silica was 19 g in terms of solid content.
/ M ² and dried to prepare an ink jet recording sheet. In addition, all the recording sheets were adjusted so that the film surface pH of the ink receiving layer became 4.2.

<Recording sheet 1> 100 parts of fumed silica (average primary particle diameter 7 nm, specific surface area 300 m ² / g by BET method) Polyvinyl alcohol 22 parts (trade name: PVA235, manufactured by Kuraray Co., Ltd., degree of saponification) 88%, average polymerization degree 3500) Boric acid 4 parts Amphoteric surfactant 0.3 parts (Product name: SWAM AM-2150, manufactured by Nippon Surfactant)

<Recording Sheet 2> The amount of polyvinyl alcohol in the recording sheet 1 was increased to 35 parts.

<Recording Sheet 3> To the ink receiving layer of the recording sheet 1 was added 5 mmol / m ² of the following compound as a comparative compound.

[0056]

Embedded image

<Recording Sheet 4> Ascorbic acid was added as a comparative compound to the ink receiving layer of the recording sheet 1 in an amount of 5 mmol / m ² .

<Recording Sheet 5> To the ink receiving layer of the recording sheet 1 was added 5 mmol / m ^{2 of} benzoic acid as the compound of the present invention.

<Recording Sheet 6> To the ink receiving layer of the recording sheet 1 was added 5 mmol / m ^{2 of} 2-chlorobenzoic acid as the compound of the present invention.

<Recording Sheet 7> To the ink receiving layer of the recording sheet 1 was added 5 mmol / m ^{2 of} 2-methylbenzoic acid as a compound of the present invention.

<Recording Sheet 8> To the ink receiving layer of the recording sheet 1 was added 5 mmol / m ^{2 of} salicylic acid as the compound of the present invention.

<Recording Sheet 9> To the ink receiving layer of the recording sheet 1 was added 5 mmol / m ^{2 of} 4-methylsalicylic acid as the compound of the present invention.

Each of the obtained ink jet recording sheets was evaluated for ink absorbency, storage stability after printing (light fastness and gas fastness), and glossiness. Table 1 shows the results.

<Ink Absorption> Using an ink-jet printer (PM-770C manufactured by Seiko Epson Corporation),
Print 100% of each of C, M, Y, and PP immediately after printing
The C paper was superimposed on the printing portion and pressed lightly, and the amount of ink transferred to the PPC paper was visually observed and evaluated according to the following criteria. ：: No transfer at all. ×: Transfer.

<Light resistance> CYMK using an ink jet printer (PM-770C manufactured by Seiko Epson Corporation) was used.
Solid printing with each of the following inks, and irradiating at 600 W / m ² for 30 hours with a Suntest CPS photobleaching tester manufactured by Atlas Co., Ltd., and then measuring the density of the printed portion, the image remaining ratio (density after irradiation / before irradiation) Of the CMYK image.
The one with the lowest remaining rate is indicated.

<Gas resistance> After printing in the same manner as in the light resistance test described above, after exposure to air at room temperature for 4 months, the density of the printed portion was measured, and the image residual ratio (density after exposure / density before exposure) was measured. ) Was obtained, and among the CMYK images, the one with the lowest remaining rate was displayed.

<Glossiness> Glossiness was measured according to the method described in JIS P-8142 (test method for 75 ° specular glossiness of paper and paperboard).

[0068]

[Table 1] 記録 Recording sheet Ink absorptivity Storage (%) Remarks Lightfastness Gasfastness ───────────────────────────── 1 ○ 70 68 Comparison 2 × 72 80 Comparison 3 ○ 77 72 Comparison 4 ○ 75 73 Comparison 5 ○ 85 91 invention 6 ○ 86 85 invention 7 ○ 84 85 invention 8 ○ 83 90 invention 9 ○ 85 83 invention ───────────────────── ───────

The gloss was 60 to 6 for all recording sheets.
5% showed high gloss.

As is evident from the above results, the use of the compound of the present invention improves storage stability while maintaining high ink absorbency. That is, although the ink absorbency is improved by reducing the amount of the polyvinyl alcohol which is a water-soluble binder, the storage stability, particularly the gas resistance, is significantly reduced. According to the present invention, the ink absorbency and the storage stability are improved at the same time, and a photo-like high gloss can be obtained.

Example 2 The fumed silica used in Example 1 had an average primary particle size of 30 n.
The same test was conducted except that m was replaced. As a result, almost the same results were obtained in the ink absorbency and the storage stability, but the glossiness was reduced by 5 to 10%.

Example 3 The recording sheets 5 to 9 of the present invention of Example 1 were further added as a cationic compound to a diallylamine hydrochloride-sulfur dioxide copolymer of a cationic polymer (PA, manufactured by Nitto Boseki Co., Ltd.)
S-92) and 3 parts of basic polyaluminum hydroxide (Hyurachem WT manufactured by Riken Clean Co., Ltd.) were used alone or in combination to prepare recording sheets 5A to 9A, 5B to 9B and 5C to 9C. Was evaluated in the same way as Table 2 shows the results.

[0073]

[Table 2] ────────────────────────────── Recording sheet Cationic ink absorptivity Storage compound Light fastness Gas fastness ────────────────────────────── 5A Cationic polymer ○ 85 95 6A 〃 ○ 86 9 17A 〃 ○ 85 928A 〃 ○ 84 959 A 〃 ８５ 85 91 5B basic poly ○ 92 92 aluminum hydroxide 6B 〃 ９３ 93 867 B 〃 ９２ 92 886 B ○ 92 928C ○ 93 959C ○ ○ 93 92

The gloss was 60 to 6 for all recording sheets.
5% showed high gloss.

As can be seen from the above results, the storage stability is further improved by using the compound of the present invention in combination with a cationic polymer or a water-soluble metal compound as the cationic compound. In particular, the combined use of a cationic polymer and a water-soluble metal compound further improves the storage stability.

[0076]

According to the present invention, a photo-like ink jet recording material having high ink absorption, high gloss and improved storage stability can be obtained.

Claims (4)

[Claims] 1. An ink-jet recording material comprising a support and an ink-receiving layer mainly containing fumed silica, wherein the ink-receiving layer contains a compound of the following formula (1). . Embedded image (Wherein, R represents a substitutable group excluding a hydroxy group,
m represents an integer of 0 or 1, and n represents an integer of 0, 1, 2, or 3. ) 2. An average particle diameter of primary particles of the fumed silica is 3 to 15 nm, and a specific surface area by BET method is 20.
Jet recording material according to claim 1 is 0 m ² / g or more. 3. The ink receiving layer is formed of fumed silica.
To 30 g / m ² containing ink jet recording material according to claim 1 or 2 hydrophilic binder to the inorganic fine particles, containing 30 wt% or less. 4. The ink jet recording material according to claim 1, wherein the ink receiving layer further contains a cationic compound.