JP2003251912A - Inkjet recording material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording material, which has no surface defects such as cracks or the like, is excellent in light transmission properties, printer carrying properties, ink absorbency and printing density, during the manufacturing and handling of which folding cracks are hard to develop and which has the favorable offset of a printed image. <P>SOLUTION: In the inkjet recording material, on at least one side of a light transmitting support of which, at least one ink receiving layer is provided and, on its opposite side of which, at least one back-coating layer including coloidal silica, a hydrophilic binder and a crosslinker, the back-coating layer includes 50 to 300 mass % in solid of the hydrophilic binder to the colloidal silica, 8 to 20 mass % in solid of the crosslinker to the hydrophilic binder and 70 volume % or less of voids. <P>COPYRIGHT: (C)2003,JPO

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 using a light-transmissive support, and more particularly, it is used for medical and OHP purposes and has no surface defects such as cracks, light transmission and printer transportability. The present invention relates to an inkjet recording material which has excellent ink absorbency and print density, is less prone to breakage during manufacture and handling, and has good show-through of a printed image.

[0002]

2. Description of the Related Art Silver salt photographic light-sensitive materials that have been commonly used in the medical field so far use expensive silver salts.
Wet processing such as development processing was necessary, and there was a problem of waste liquid accompanying it. The thermal transfer system has a problem of ink peeling and the sublimation system has a problem of low print density. On the other hand, the ink jet recording material is a completely dry recording system, and has advantages such as low noise, easy change of recording pattern, and accurate and rapid image formation.

As an ink jet recording material, an ink receiving layer made of a hydrophilic polymer or a porous ink made of a pigment such as amorphous silica and a water-soluble binder is provided on a support called ordinary paper or ink jet recording paper. A recording material provided with a receiving layer is known.

For example, JP-A-56-080489, 59-174381, 60-220750 and 6
1-32788, 63-160875, JP-A-3
As disclosed in JP-A-69388 and the like, a recording material in which a hydrophilic polymer such as starch or polyvinyl alcohol is coated on a support has been proposed.

For example, JP-A-55-51583 and JP-A-5-51583.
No. 6-157, No. 57-107879, No. 57-10.
No. 7880, No. 59-230787, No. 62-160.
No. 277, No. 62-184879, No. 62-1833.
82 and 64-11877, JP-A-3-215.
No. 08, 4-67986, etc., there is proposed a recording material obtained by coating a paper support with a silicon-containing pigment such as silica or an alumina sol together with an aqueous binder.

Further, Japanese Patent Publication No. 3-56552 and Japanese Patent Application Laid-Open No. HEI-2.
No. 188287, No. 8-132728, No. 10
81064, 10-119423, 10
-175365, 10-203006, 10-
217601, Doppei 11-20300, Doppei 11-
Nos. 20306 and 11-34481 disclose recording materials using synthetic silica fine particles prepared by a vapor phase method (hereinafter referred to as vapor phase silica).

On the other hand, the production of transparent recording sheets for OHP or the like and medical films by the ink jet recording system is also under study. The properties required for these recording sheets are ink absorbency, water resistance, light transmission, printer transportability, and blocking property due to lamination when printing continuously, and show-through property of the image. There was a problem that the ink receiving layer surface or the back surface was broken during handling or handling. Folding is a phenomenon in which when a recording material is bent, a crack is generated on a convex surface, which is likely to occur in a low temperature and low humidity environment.

Japanese Patent Laid-Open No. 7-276789 discloses a colorant receiving layer in which a transparent support has a silica fine particle having an average primary particle diameter of 10 nm or less and a water-soluble resin in a mass ratio of 1.5: 1 to 10: 1. A recording material provided with a high ink absorbency and high transparency is disclosed. However, there is no description of improving transportability, scratch resistance and blocking property by providing a backing layer.

Japanese Unexamined Patent Publication Nos. 8-174994 and 9-263.
Japanese Patent No. 043 proposes to improve blocking by containing fine particles or filler protruding from the surface in the ink receiving layer. However, there are restrictions from glossiness, image sharpness, and touch feeling, and it is not sufficient to deal with only the ink receiving layer. In JP-A-9-234944, the opposite surface of the ink receiving layer is water and a high boiling point alcohol. Although a proposal has been made to improve blocking and show-through by making the absorbency against the specific amount above, improvement of show-through was insufficient.

In general, a backing layer may be provided to prevent curling for the purpose of improving the transportability of the recording material to the printer during printing. The backing layer is supported before the ink receiving layer is provided. Since it is often provided on the body, folding cracks occur when the backing layer is convex in the manufacturing process, or the distortion that causes the folding cracks remains, and folding cracks easily occur during handling. JP-A-7-101142, JP-A-9-254532, JP-A-2001-10211 and JP-A-2
Japanese Patent Application Laid-Open No. 001-80207 proposes to improve the folding crack of the ink receiving layer. However, even if the same means is used for the back coating layer, the effect of improving the folding crack is insufficient, or The development of other effective means has been desired because of the reduced transparency.

[0011]

DISCLOSURE OF THE INVENTION It is an object of the present invention to have no surface defects, no creases in the backing layer during production or handling, no show-through of printed images, ink absorbency and print density. It is an object of the present invention to provide an inkjet recording material having good printer transportability and light transmittance.

[0012]

Means for Solving the Problems As a result of a sincere study for solving the above problems, the present inventors have found that show-through of an image occurs by two different types of mechanisms. In other words, a mechanism in which the ink of the printed image comes into direct contact with the back surface of the recording material (hereinafter referred to as "ink show-through").
And a mechanism in which water or an organic solvent contained in the ink of the printed image is adsorbed on the back surface by volatilization to become transparent or cloudy (hereinafter referred to as “show-through of solvent”). Particularly in the case of transparent recording materials, the latter causes transparency and white turbidity to be serious defects, and as a result, we have made diligent studies on the improvement and resistance to back cracking of the backing layer (hereinafter referred to as "crease resistance"). As a result of the examination of the following, basically, by the following means, excellent in ink absorption, water resistance, light transmission,
The present invention has been completed in which the show-through of images and the resistance to folding cracks are excellent.

An ink jet recording material in which at least one layer of an ink receiving layer is provided on one side of a light transmissive support, and a backing layer containing at least one layer of colloidal silica, a hydrophilic binder and a crosslinking agent is provided on the other side. At
The backing layer contains a hydrophilic binder in a solid content of 50 to 300% by mass with respect to colloidal silica and a crosslinking agent in a solid content of 8 to 20% by mass with respect to the hydrophilic binder, and has a porosity of 70. An ink jet recording material characterized by being less than or equal to volume%.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
Examples of the light transmissive support used in the present invention include polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate, diacetate resins, triacetate resins, nitrocellulose, cellulose ester resins such as cellulose acetate, and polyolefin resins. , Acrylic resin, polycarbonate resin,
Examples of the plastic resin film include polyvinyl chloride, polyimide resin, polysulfone, polyphenylene oxide, cellophane, and celluloid. In particular, a polyester resin film is preferably used due to its characteristics such as heat resistance and cost. The thickness of these resin film supports is preferably about 50 to 250 μm from the viewpoint of curl property, handling ease, etc., and 80 to 250 μm from the viewpoint of folding crack resistance.

In the present invention, the at least one ink receiving layer coated on the light-transmitting support contains a hydrophilic binder, and an inorganic pigment, a cationic polymer, a cross-linking agent, a surfactant and the like at appropriate times. In the case (hereinafter referred to as "swellable ink receiving layer"), hydrophilic polymer, inorganic fine particles, preferably inorganic fine particles having an average primary particle diameter of 5 to 50 nm, and a cross-linking agent, a cationic polymer, and a surfactant at appropriate times. And the like (hereinafter referred to as “void ink receiving layer”). The coating liquid for the ink receiving layer is applied so that a coating layer having a thickness of several tens to several hundreds μm is formed on the support, and then dried. In a preferred example of the production method, the ink receiving layer coated on the light transmissive support is once cooled in an atmosphere of 20 ° C. or lower, and then dried in a drying step.

In comparison with a general swellable ink-receiving layer and a porous ink-receiving layer, the former has a high gloss, but tends to have a glare on the surface, and has a property of poor ink absorbability. In particular, when used for medical purposes, the ink absorptivity is an important characteristic because the image printed by the ink jet must sufficiently reproduce the real thing. The increase in the glare on the surface due to the return light of the external light is not preferable because it becomes difficult to see when used in a backlight system in which light is irradiated from the surface opposite to the printing surface to observe an image from the printing surface. From the above, the porous ink-receiving layer is preferable for medical use and the like used in the backlight system, but it is not at a sufficient level for practical use.

In the present invention, the hydrophilic polymer used in the case of the swellable ink receiving layer is gelatin, polyvinyl alcohol, polyvinylpyrrolidone, polyvinylpyridinium halide, polyacrylamide, sodium polyacrylate, starch, carboxy starch, cationic starch, Examples thereof include dialdehyde starch, casein, ethyl cellulose, carboxymethyl cellulose, polyethylene glycol, polypropylene glycol, styrene-maleic anhydride copolymer and modified products thereof.

In the present invention, the inorganic fine particles used in the case of the porous ink receiving layer include light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, titanium dioxide, zinc oxide, zinc hydroxide, calcium silicate and silicic acid. Examples thereof include magnesium, synthetic silica, alumina, hydrated alumina, aluminum oxide and magnesium hydroxide. Preferably, the average particle size of the primary particles is 5 to
Inorganic fine particles of 30 nm are used, and vapor phase silica, alumina, and alumina hydrate are selected in view of high printing density, clear image, and low manufacturing cost. Especially for medical use, it is preferable that the inorganic fine particles to be used have a small average particle size because light transmittance and high density reproducibility of a printed image are required, but it is determined in relation to ink absorbability.

Synthetic silica includes a wet method and a vapor phase method. Usually, silica fine particles often refer to wet-process silica. As the wet process silica, silica sol obtained through metathesis of sodium silicate with an acid or the like or an ion exchange resin layer, or colloidal silica obtained by heating and aging this silica sol, and gelation of the silica sol, and by changing the formation conditions thereof Silica gel in which primary particles of several μm to 10 μm are siloxane-bonded to form three-dimensional secondary particles, and further, silica sol, sodium silicate, sodium aluminate, and the like silicic acid obtained by heating are produced. There is a synthetic silicic acid compound as a main component. Wet silica is typically a silanol group on the surface is 5 / nm ² or more.

Vapor phase 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 burning silicon tetrachloride with hydrogen and oxygen is generally known, but instead of silicon tetrachloride, silanes such as methyltrichlorosilane and trichlorosilane may be used alone or in the form of silicon tetrachloride. It can be used as a mixture with. The vapor phase silica is available from Aerosil Japan and QS from Tokuyama Corporation.
It is commercially available as a type and can be obtained. The number of silanol groups on the surface of vapor-phase method silica is generally less than 5 / nm ² .

In the present invention, vapor phase silica having an average primary particle size of 5 to 50 nm is generally used in view of print density, transparency and glossiness, but in view of ink absorbency, transparency and glossiness, it is averaged. The primary particle size is preferably 5 to 30 nm. However, when the particle size is small, the glare on the surface tends to appear due to external light.

The average primary particle diameter of the inorganic fine particles of the present invention is the diameter of a circle equal to the projected area of each of 100 particles existing in a certain area by observing the particles dispersed to the extent that the primary particles can be discriminated. The average particle diameter was determined using the particle diameter of the particles. Similarly, the secondary particles were obtained by observing the particles dispersed by a gentle shearing force with an electron microscope.

In the present invention, the solid content per unit area of the ink receiving layer is generally 10 g / m ² or more, and 1
The range of 3 to 35 g / m ² is preferable.

The porous ink receiving layer of the present invention has a binder in order to maintain the properties as a film. As this binder, a hydrophilic binder having high transparency and high ink permeability can be used. In using the hydrophilic binder, it is important that the hydrophilic binder does not swell and block the voids at the initial penetration of the ink, and from this viewpoint, it is exemplified as the hydrophilic binder used in the swellable ink receiving layer. Among the types, hydrophilic polymers having a low swelling property at around room temperature are preferably used. Examples thereof include polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polyethylene oxide, hydroxyethyl cellulose, casein, and modified products thereof, and among them, completely or partially saponified polyvinyl alcohol or cation-modified polyvinyl alcohol is preferable.

Among the polyvinyl alcohols, those partially or completely saponified with a saponification degree of 80% or more are particularly preferable. Polyvinyl alcohol having an average degree of polymerization of 1000 to 5000 is preferable.

As the cation-modified polyvinyl alcohol, for example, as described in JP-A No. 61-10483, primary to tertiary amino groups or quaternary ammonium groups are added to the main chain or side chain of polyvinyl alcohol. It is polyvinyl alcohol contained therein.

Other hydrophilic polymers and latices can be used in combination, but the amount is preferably about 20% by mass or less based on polyvinyl alcohol.

In the present invention, the mass ratio of the hydrophilic polymer to the inorganic fine particles in the porous ink receiving layer is determined mainly by the transparency of the ink receiving layer, the ink absorbency and the surface strength, but generally 5 to 5. It is 35% by mass, and preferably in the range of 8 to 30% by mass. Increasing the ratio of the inorganic fine particles to the hydrophilic polymer improves ink absorbency, but decreases transparency and easily causes cracks during drying.
The surface strength is reduced and powder is likely to fall off. On the contrary, when the ratio is lowered, the transparency and the surface strength are improved, but the ink absorbency and the show-through of the solvent are lowered.

In the present invention, the average particle size is preferably 1 μm or more, and preferably 5 μm or more in order to improve the show-through of the ink, reduce the glare on the surface where the external light is reflected from the surface of the recording material, and improve the transportability of the printer. At least one of an inorganic pigment and an organic pigment having a thickness of 20 μm is used in the ink receiving layer. For example, light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, titanium dioxide, zinc oxide, zinc hydroxide, calcium silicate, magnesium silicate, synthetic silica, alumina, hydrated alumina, aluminum oxide, magnesium hydroxide, etc. Inorganic pigments and organic pigments such as polystyrene, polyethylene, polyacrylic acid ester, polymethacrylic acid ester, polyvinyl chloride, and urea resin. Synthetic silica, particularly wet process silica, is preferably selected from the viewpoint of the effect of reducing ink absorbency and glare on the surface. If the average particle size is smaller than 1 μm, the effect of reducing the return light due to light reflection cannot be obtained. It is preferable that the average particle diameter is larger than 5 μm from the viewpoint of improving the glare and improving the show-through of the ink. The average particle size is preferably 20 μm or less from the viewpoint of graininess to the touch and image clarity. The content of the inorganic pigment or organic pigment having an average particle diameter of 1 μm or more in the ink receiving layer is 0.0 per unit area of the recording material.
It is contained in an amount of about 1 to 3 g / m ² . Preferably 0.01-2
g / m ² content. When it is less than 0.01 g / m ² , the effect of improving show-through and glare is small, and when it is more than 3 g / m ² , the transparency and the feeling of touch tend to decrease. In the present invention, the average particle size of 1 μm or more means that either one of the primary particles and the secondary particles is 1 μm.
It may be m or more. In particular, the effect of improving show-through, glare and the like is greater when the number of ink receiving layers is two or more and the uppermost layer contains an inorganic pigment or an organic pigment having an average particle size of 1 μm or more.

In the present invention, colloidal silica is used together with a hydrophilic binder from the viewpoint of coating property of backing layer, improvement of transportability to a printer, and scratch resistance. However, in view of transparency and show-through, an average primary particle diameter is 5 to 50 nm. Of colloidal silica is preferable, and particularly preferably, the average primary particle size is 5 to 40 n.
m colloidal silica is used. The colloidal silica is selected from those similar to those used in the ink receiving layer. From the viewpoint of light transmission, it is preferable that the primary particle size is small, and from the viewpoint of resistance to cracking and folding, it is preferable that the particle size is 5 to 50 nm. Is preferred. If the amount of hydrophilic binder is increased, the crease resistance is improved, but the coating suitability,
Water resistance and printer transportability tend to decrease. In the present invention, the backing layer contains a hydrophilic binder in a solid content of 50 to 300% by mass with respect to the colloidal silica, and a crosslinking agent in a solid content of 8 to 20% by mass with respect to the hydrophilic binder. By adjusting the content to not more than 50% by volume, preferably not more than 55% by volume, the coating suitability is good and the transparency is excellent, and there is no problem of crease breaks or show-through of the solvent after printing, and the transportability of the printer is improved. The porosity is adjusted by selecting the types and ratios of colloidal silica, hydrophilic binder, and crosslinking agent. Examples of the colloidal silica include ST-20, ST-30, ST-4 from Nissan Chemical Industries, Ltd.
0, ST-C, ST-N, ST-O, ST-S, ST-
20L, ST-OL, ST-AK, etc. are commercially available, and those having an average primary particle size of 5 to 40 nm are preferably used. It is also possible to use more than one type of colloidal silica. Inorganic fine particles such as fumed silica, alumina, and alumina hydrate can be used for the backing layer in addition to colloidal silica, but 20% by mass or less of the solid content of colloidal silica is preferable from the viewpoint of scratch resistance.

The hydrophilic binder used in the backing layer of the present invention may be the same as that used in the ink receiving layer, but polyvinyl alcohol or a modified product thereof is preferable from the viewpoint of preventing the set-off of the solvent. .

The ratio of the hydrophilic binder to the colloidal silica in the backing layer of the present invention is 50 to 300% by mass, preferably 60 to 200% by mass. If the amount is more than 300% by mass, the folding crack resistance is improved, but the transportability and water resistance of the printer are poor, and if it is less than 50% by mass, the folding crack resistance is lowered.

In the present invention, a cross-linking agent is used in the backing layer in order to improve coating suitability, improve cracking during coating and drying, and improve water resistance. Specific examples of the cross-linking 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, compounds having a reactive halogen such as those described in US Pat. No. 3,288,775, divinyl sulfone, US Pat.
Compounds having a reactive olefin as described in U.S. Pat. No. 35,718, N- as described in U.S. Pat.
Methylol compounds, isocyanates such as those described in US Pat. No. 3,103,437, US Pat. No. 3,017,2
80, 2,983,611, aziridine compounds, US Pat. No. 3,100,704, carbodiimide compounds, US Pat. No. 3,091,5.
There are epoxy compounds such as those described in No. 37, halogen carboxaldehydes such as mucochloric acid, dioxane derivatives such as dihydroxydioxane, inorganic crosslinking agents such as chromium alum, zirconium sulfate, boric acid and borate. Alternatively, two or more kinds can be used in combination. At least one of boric acid and borate is preferably used. The amount of the cross-linking agent added to the backing layer varies depending on the type, the kind of the hydrophilic binder, the content, etc., but in the present invention, the solid content of the hydrophilic binder is 50 to 300% by mass of the colloidal silica. The solid content of is 8 to 20 mass% of the solid content of the hydrophilic binder. If the solid content of the cross-linking agent is less than 8% by mass, the water resistance will decrease, and cracks will easily occur depending on the drying conditions after application, and if it exceeds 20% by mass, fine crevices will occur and the folded part will be clouded. To do.

The backing layer of the present invention preferably has an average particle size of 1 to 2 contained in the ink receiving layer in order to reduce glare.
Incorporation of a pigment similar to an organic pigment or an inorganic pigment of 0 μm improves printer transportability and ink show-through, but if too much is added, the ink receiving layer and the backing layer are likely to be scratched, so 1 g / m ² The following are preferred. Organic pigments are particularly preferable in view of the show-through of the solvent.

The solid content per unit area of the backing layer of the present invention is generally 0.5 to 15 g / m ² , preferably 1 to 10 g / m ² , but depending on the curling property of the recording material to be obtained. The amount of hydrophilic binder and the amount of solid content are determined. If the coating amount is large, creases are likely to occur, and if they occur, they tend to stand out.

The porosity of the backing layer of the present invention is a value obtained by subtracting the total solid content of colloidal silica, hydrophilic binder and the like in the layer from the volume obtained from the dry film thickness of the backing layer. It is a ratio to the total solid content volume. The porosity of the backing layer of the present invention is 70% by volume or less, preferably 55%.
Volume% or less. When the porosity is more than 70% by volume, the solvent of the ink easily penetrates or is adsorbed, and the show-through of the solvent is reduced. Although there is no particular lower limit, it is preferable that the surface of the backing layer has appropriate fine irregularities from the viewpoint of transportability and show-through property, so about 3% by volume or more, particularly 5% by volume or more is desirable.

In the present invention, the ink receiving layer has two or more layers,
The lower ink receiving layer near the light transmissive support contains vapor phase silica having an average primary particle size of 10 to 30 nm and a hydrophilic binder, and the upper ink receiving layer apart from the light transmissive support has average primary particles. It is preferable to use alumina or alumina hydrate having a diameter of 5 to 30 nm and a hydrophilic binder because the print density and ink absorbency are improved. Preferably,
The ratio of the hydrophilic binder to the fumed silica in the lower ink receiving layer is 5 to 20% by mass, and the ratio of the hydrophilic binder to alumina or alumina hydrate in the upper ink receiving layer is 6 to 22% by mass. In particular, it is preferable to make the ratio of the former smaller than that of the latter because the ink absorbency and the show-through of the solvent will be good.

The inks used for ink jet recording include solvent-based inks and water-based inks. The solvent-based inks contain a colorant in a solvent such as alcohols, ketones and ethers. , An anionic colorant and the like are mixed in water and a water-soluble organic solvent such as methanol, ethanol, butanol, and ethylene glycol.

The reason why the show-through of the ink is improved by the present invention is that by containing colloidal silica in the backing layer, a space exists between the printed image surface of the front ink-receiving layer and the backing layer surface, A preferred embodiment is that the space is further expanded by an organic pigment or an inorganic pigment having an average particle diameter of 1 μm or more used in the ink receiving layer or the backing layer for improving the glitter feeling. The reason why the show-through of the solvent is good is the same as the case of the show-through of the ink being good, because there is a space between the printed image surface and the surface of the backing layer, the volatilized solvent is easily dispersed, and By using fine colloidal silica and a hydrophilic binder for the backing layer, a dense layer structure having a porosity of 70% by volume or less is obtained, and thus the volatilized ink solvent is difficult to adsorb or penetrate. In particular, the ink receiving layer is preferably a void type, and by using vapor-phase method silica and reducing the hydrophilic binder ratio, the ink absorbency is higher,
Since the solvent diffuses into the ink receiving layer, the volatilization directly on the surface of the image portion is reduced, and the set-off of the solvent is favorable together with the set-up of the ink, which is preferable.

In the present invention, a surfactant can be used for the purpose of improving coating suitability and surface property. Cationic surfactants include aliphatic amine salts, aliphatic quaternary ammonium salts, benzalkonium salts, benzethonium chloride, pyridinium salts, imidazolium salts, and amphoteric surfactants such as carboxybetaine type and aminocarboxylic acid. Nonionic surfactants such as salt, imidazolium betaine and lecithin include polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene sorbitan fatty acid ester, polyethylene glycol fatty acid ester, sucrose fatty acid ester, fatty acid alkanolamide, etc. From time to time, one or more types are selected. Anionic surfactants such as carboxylic acid salts and sulfonic acid salts can be used, but the amount is limited due to the cohesiveness with the ink receiving layer composition.

In the present invention, in order to improve glossiness and scratch resistance, a protective layer may be provided on the ink receiving layer within a range that does not significantly deteriorate ink absorbency and transparency. Is 5 μm or less.

The ink jet recording material of the present invention is a JI
The haze value specified in SK-7105 is preferably 25% or less, more preferably 18% or less. If the numerical value is high, the sharpness of the image is deteriorated, especially when used in a medical backlight system, and it is easy to make a mistake in viewing.

The ink receiving layer of the present invention preferably contains a cationic compound. Examples of the cationic compound used in the present invention include a cationic polymer and a water-soluble metal compound used for the purpose of improving water resistance. The cationic polymer tends to lower the transparency when used in combination with the vapor-phase method silica, but the water-soluble metal compound suppresses the generation of fine cracks and conversely improves the transparency. Therefore, the present invention has the advantages that the inorganic fine particles and the water-soluble metal compound have good ink absorbency, water resistance, and high transparency.

As the cationic polymer used in the present invention, polyethyleneimine, polydiallylamine, polyallylamine, JP-A-59-20696 and 59-59
33176, 59-33177, 59-155.
No. 088, No. 60-11389, No. 60-49990.
No. 60-83882, No. 60-109894,
62-198493, 63-49478, 6
3-115780, 63-280681, JP-A-1-40371, 6-234268, 7-12.
Polymers having a primary to tertiary amino group and a quaternary ammonium base described in JP 5411, 10-193776, etc. are preferably used. The molecular weight of these cationic polymers is 5,000 or more, and further 5,000 to 10
About 10,000 is preferable.

The amount of these cationic polymers used is 1 to 10% by mass, preferably 2 to 7% by mass, based on the inorganic fine particles.

Examples of the water-soluble metal compound used in the present invention include water-soluble polyvalent metal salts. Examples thereof include 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, chloride chloride. Dicopper, ammonium chloride copper (II) dihydrate, copper sulfate, cobalt chloride,
Cobalt thiocyanate, cobalt sulfate, nickel sulfate hexahydrate, nickel chloride hexahydrate, nickel acetate tetrahydrate, nickel ammonium ammonium hexahydrate, nickel amidosulfate tetrahydrate, aluminum sulfate, aluminum sulfite, Aluminum thiosulfate, polyaluminum chloride, aluminum nitrate nonahydrate, aluminum chloride hexahydrate,
Ferrous bromide, ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, zinc phenolsulfonate, zinc bromide, zinc chloride, zinc nitrate hexahydrate, zinc sulfate, zirconium acetate , Zirconium chloride, zirconium chloride octahydrate, zirconium hydroxychloride, chromium acetate, chromium sulfate, magnesium sulfate, magnesium chloride hexahydrate,
Magnesium citrate nonahydrate, sodium phosphotungstate, sodium tungsten citrate, 12 tungstophosphoric acid n hydrate, 12 tungstosilicic acid 26 hydrate, molybdenum chloride, 12 molybdophosphoric acid n hydrate, etc. To be A zirconium-based compound is preferable in view of characteristics.

Further, as the cationic compound, an inorganic type compound is used.
Basic polyhydric acid, an aluminum-containing cationic polymer
Aluminum compounds can be mentioned. Basic polyhydration
The aluminum compound has the following main formulas 1 and 2
Or 3 and, for example, [Al₆(OH)₁₅]³⁺, [A
l₈(OH)₂₀]⁴⁺, [Al₁₃(OH)₃₄]⁵⁺, [Al
_{twenty one}(OH)₆₀]³⁺Basic, macromolecular polynuclear contractions such as
Water-soluble polyaluminum hydroxide containing stable mixed ions
It is Ni.

[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 ... Equation 3

These are water treatment agents from Taki Chemical Co., Ltd. under the name of Poly Aluminum Chloride (PAC), poly aluminum hydroxide (Paho) from Asada Chemical 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 easily available. In the present invention, these commercially available products can be used as they are,
Some have an inappropriately low pH, and in that case, the pH can be adjusted appropriately before use.

In the present invention, the content of the water-soluble metal compound in the ink receiving layer is 0.1 g / m ^{2 to} 10 g /
m ^2, preferably from ^{0.2g / m 2 ~5g / m 2} .

Two or more of the above-mentioned cationic compounds can be used in combination. For example, a cationic polymer and a water-soluble metal compound may be used together.

In the present invention, the ink receiving layer may be hardened with a crosslinking agent similar to that used in the backing layer for the purpose of improving water resistance and dot reproducibility. The amount of the crosslinking agent added is preferably 0.01 to 40% by mass, more preferably 0.1 to 30% by mass, based on the solid content of the hydrophilic binder constituting the ink receiving layer.

In the present invention, the ink receiving layer further comprises a coloring dye, a coloring pigment, a fixing agent for the ink dye, an ultraviolet absorber, an antioxidant, a pigment dispersant, an antifoaming agent, an organic solvent, a leveling agent, Antiseptic, optical brightener, viscosity stabilizer,
Various known additives such as a pH adjuster can also be added.

In the present invention, the coating method of the ink receiving layer and the back coating layer is not particularly limited, and a known coating method can be used. For example, there are a slide bead method, a curtain method, an extrusion method, an air knife method, a roll coating method, a ked bar coating method and the like.

When adjusting the transparency and color tone of the light transmissive support, it is prepared, for example, by mixing inorganic fine particles with a thermoplastic resin. Examples of the inorganic fine particles include calcium carbonate, titanium dioxide, talc and silica. , And color pigments such as carbon black can be used. In the present invention, a support having an opacity of 60% or less is preferably used. When it is more than 60%, the light transmittance is poor and the image becomes unclear and dark. 5
If it is lower than%, the transmitted light becomes strong and the image becomes difficult to see depending on the illumination of the light source. Especially for medical use, a blue PET film colored in blue is preferably used.

When the coating solution for the ink receiving layer and the backing layer is applied to the plastic resin film support, corona discharge treatment, flame treatment, ultraviolet irradiation treatment, plasma treatment and the like are usually carried out prior to coating.

In the present invention, it is preferable to provide a primer layer mainly composed of a natural resin or a synthetic resin on a light-transmitting support such as a plastic resin film. The transparency is further improved by applying a coating solution for the ink receiving layer and the backing layer on the primer layer, cooling and drying at a relatively low temperature.

The above-mentioned primer layer is 0.01 on the support.
It is provided with a film thickness (dry film thickness) of ˜5 μm. It is preferably in the range of 0.05 to 5 μm.

[0059]

The present invention will be described in detail below with reference to examples, but the contents of the present invention are not limited to the examples.

Example 1 The following light-transmissive support was prepared. <Support A> After a corona discharge treatment on both sides of a polyethylene terephthalate film (opacity 15%) colored in blue with a thickness of 175 μm, a primer layer having the following composition was provided so as to have a dry film thickness of 0.3 μm. Primer layer: Vinylidene chloride: Methyl acrylate:
A latex of acrylic acid (90: 9: 1, mass%) (mass average molecular weight 42000).

The backing coating liquid 1 having the following composition was coated on the above-mentioned support with a slide bead coating device and dried. The coating solution for the backing layer was adjusted to a solid content concentration of 12% by mass, applied so that the solid content application amount was 6 g / m ² , and dried. Subsequently, the ink receiving layer was made into two layers, and the ink receiving layer lower layer coating liquid 1 having the following composition near the support and the ink receiving layer upper layer coating liquid 1 separated from the support were prepared so as to have a solid content concentration of 10% by mass. and, the solid content coating amount of the lower layer 15 g / m ^2, was coated with a slide bead coating apparatus such that the upper layer 5 g / m ^2, to obtain an ink jet recording material of example 1 and dried.

[0062] <Back coating liquid 1> 100 parts of colloidal silica (Nissan Chemical Co., Ltd., ST-C, average primary particle size 15 nm) Polyvinyl alcohol (Kuraray, PVA117) 100 parts Polystyrene particles 1 part   (Sekisui Plastics Co., Ltd., SBX-6, average particle size 6 μm) Boric acid 12 parts

[0063] <Ink receiving layer lower layer coating liquid 1> 100 parts of vapor phase silica   (Average primary particle size 12 nm) Dimethyldiallylammonium chloride homopolymer 3 parts Boric acid 4 parts Polyvinyl alcohol 20 parts   (Saponification degree 88%, average degree of polymerization 3500) Basic poly aluminum hydroxide 2 parts (Riken Green Co .; Purachem WT) Surfactant 1.0 part

<Ink-Receptive Layer Upper Layer Coating Liquid 1> 100 parts of vapor phase silica (manufactured by Tokuyama Corporation, average primary particle size 12 nm) dimethyldiallylammonium chloride homopolymer 3 parts boric acid 4 parts polyvinyl alcohol 20 parts (saponification degree 88 %, Average degree of polymerization 3500) Surfactant 1.0 part Polystyrene particles 10 parts (Sekisui Plastics Co., Ltd., SBX-17, average particle size 17 μm) Drying conditions after coating the backing layer and the ink receiving layer Shown below. After cooling at 5 ° C for 30 seconds, the total solid content concentration is 90
Dry up to wt% at 45 ° C 10% RH, then 35 ° C
It was dried at 10% RH.

The ink jet recording material prepared as described above was allowed to stand overnight at 23 ° C. and 55% RH for one day and then evaluated as follows. The results are shown in Tables 1 and 2.

<Crack Property> The crack of the backing layer of the unprinted recording material was visually observed and evaluated according to the following criteria. ◯: No cracks at all. Δ: Can be actually used although there are fine cracks. X: Many cracks.

<Crack resistance> After leaving unprinted ink jet recording material in an environment of 10 ° C. and 20% RH for one day and night,
2 cm × with the same direction as the long side of the recording material
A sample cut into a strip shape having a size of 6 cm was prepared, and when the short sides were brought close to each other so that the backing layer was convex, the radius of curvature when the backing layer cracked was measured. . When no crease was generated, a sample having a short long side was prepared and measured. The smaller the number, the better
The following criteria were evaluated. ◯: Curvature radius is 5 mm or less Δ: Curvature radius is greater than 5 mm and 10 mm or less x: Curvature radius is greater than 10 mm

<Water resistance of backing layer> Pure water was dropped on the backing layer of an unprinted ink jet recording material, and after 1 minute, rubbing with a finger was performed to evaluate the degree of slime and scratches by the following. ○: No slime or rubbing marks. Δ: Slightly slimy, rubbing marks remained thin. X: Strong slimy and clear rubbing marks.

<Ink Absorbency> An ink jet printer (Canon F
850), cyan, magenta, yellow single color 1
00% and triple color 300% are printed, and immediately after printing PP
The C paper was overlaid on the printing portion and lightly pressure-bonded, and the degree of the amount of ink transferred to the PPC paper was visually observed and evaluated according to the following criteria. ◯: No transfer is performed. Δ: Transferable but can be actually used. X: Transfer is large and cannot be actually used.

<Printing Density> The printing density of the triple color portion printed by the Canon printer was measured with a Macbeth reflection densitometer and shown as an average value of 5 measurements.

<Show-through of ink> Triple color is printed on the recording material obtained in the example with the printer manufactured by Canon Inc.,
Immediately after the printed surface was overlaid on the back surface of the same material and 20 sheets were overlaid, the show-through of the ink was evaluated after standing at 40 ° C. for 2 hours. ◯: No show-through of ink at all. Δ: Some amount of show-through of ink, but lower limit of practical use. ×: There is show-through of ink, which cannot be actually used.

<Offset of Solvent> On the recording material obtained in the example, triple colors were printed by the printer manufactured by Canon Inc., the printed surface was immediately overlaid with the back surface of the same material, and one more sheet was overlaid. The show-through of the solvent after standing for 2 hours at ℃ was evaluated. ⊚: No show-through of solvent at all. ◯: There is some show-through of the solvent. Δ: Practical is acceptable although there is show-through of the solvent. X: Show-through of the solvent is not possible in actual use.

<Printer Transportability> The recording materials obtained in the examples were continuously printed on 50 sheets with the printer manufactured by Canon under the conditions of 23 ° C. and 55% RH to evaluate the transportability. O: Double feeding and paper jam did not occur at all. Δ: Double feeding or paper jam occurred 1-2 times. X: Double feeding or paper jam occurred three times or more.

<Visibility> A black image having an optical density of 1.5 to 2.5 was printed on the recording material obtained in the example by the plotter, and a Schaucasten (diagnostic light projector) with a light source of 10000 lux was used. The visual easiness was evaluated including the glare. A: Very good. ◯: Good. Δ: Practically acceptable although somewhat difficult to see. X: Hard to see.

Example 2 An ink jet recording material of Example 2 was obtained in the same manner as in Example 1 except that the ink receiving layer was two layers having the following composition. The vapor phase silica of the coating liquid 2 for the lower layer of the ink receiving layer is a dimethyldiallylammonium chloride homopolymer, and the pseudo-boehmite is dispersed with nitric acid at a solid content concentration of 21% by a high pressure homogenizer, and then the solid content is changed to the lower layer of the ink receiving layer. The coating liquid 2 was prepared at 12% by mass, and the ink receiving layer upper layer coating liquid 2 was prepared at 10% by mass. These coating solutions were applied so that the lower layer of the ink receiving layer had a vapor phase method silica of 16 g / m ² in solid and the pseudo-boehmite of the upper layer of the ink receiving layer had 6 g / m ² in solid. Table 1 shows the results of evaluation performed in the same manner as in Example 1.

[0076] <Ink receiving layer lower layer coating liquid 2> 100 parts of vapor phase silica   (Tokuyama, average primary particle size 20 nm) Dimethyldiallylammonium chloride homopolymer 4 parts Boric acid 4 parts Polyvinyl alcohol 10 parts   (Saponification degree 88%, average degree of polymerization 2000) Basic poly aluminum hydroxide 2 parts (Riken Green Co .; Purachem WT) Surfactant 0.3 parts

[0077] <Ink receiving layer upper layer coating liquid 2> 100 copies of pseudo-boehmite   (A flat plate with an average primary particle size of 15 nm and an aspect ratio of 5) Nitric acid 1 part Boric acid 0.5 parts Polyvinyl alcohol 15 parts   (Saponification degree 88%, average degree of polymerization 3500) 10 parts polystyrene particles   (Sekisui Plastics Co., Ltd., SBX-6, average particle size 6 μm) Surfactant 0.3 parts

The inkjet recording material of Example 2 prepared as described above was evaluated in the same manner as in Example 1. The results are shown in Tables 1 and 2.

Example 3 Example 3 was carried out in the same manner as in Example 1 except that the composition of the backing layer coating liquid 1 was changed to the following backing layer coating liquid 2.
The inkjet recording material of The results evaluated in the same manner as in Example 1 are shown in Tables 1 and 2.

[0080] <Back coating liquid 2> 100 parts of colloidal silica (Nissan Chemical Co., Ltd., ST-C, average primary particle size 15 nm) Polyvinyl alcohol (Kuraray, PVA117) 60 parts Polystyrene particles 1 part   (Sekisui Plastics Co., Ltd., SBX-6, average particle size 6 μm) Boric acid 6 parts

Example 4 Example 4 was carried out in the same manner as in Example 1 except that the composition of the backing layer coating liquid 1 was changed to the following backing layer coating liquid 3.
The inkjet recording material of The results evaluated in the same manner as in Example 1 are shown in Tables 1 and 2.

[0082] <Back coating liquid 3> 100 parts of colloidal silica (Nissan Chemical Co., Ltd., ST-C, average primary particle size 15 nm) Polyvinyl alcohol (Kuraray, PVA117) 280 parts Polystyrene particles 1 part   (Sekisui Plastics Co., Ltd., SBX-6, average particle size 6 μm) Boric acid 32 parts

Example 5 Example 5 was carried out in the same manner as in Example 1 except that the composition of the backing layer coating liquid 1 was changed to the following backing layer coating liquid 4.
The inkjet recording material of The results evaluated in the same manner as in Example 1 are shown in Tables 1 and 2.

[0084] <Back coating liquid 4> 100 parts of colloidal silica (Nissan Chemical Co., Ltd., ST-C, average primary particle size 15 nm) Polyvinyl alcohol (Kuraray, PVA117) 100 parts Polystyrene particles 1 part   (Sekisui Plastics Co., Ltd., SBX-6, average particle size 6 μm) Boric acid 8 parts

Example 6 Example 6 was carried out in the same manner as in Example 1 except that the composition of the backing layer coating solution 1 was changed to the following backing layer coating solution 5.
The inkjet recording material of The results evaluated in the same manner as in Example 1 are shown in Tables 1 and 2.

[0086] <Back coating liquid 5> 100 parts of colloidal silica (Nissan Chemical Co., Ltd., ST-C, average primary particle size 15 nm) Polyvinyl alcohol (Kuraray, PVA117) 100 parts Polystyrene particles 1 part   (Sekisui Plastics Co., Ltd., SBX-6, average particle size 6 μm) Boric acid 20 parts

Example 7 Example 7 was carried out in the same manner as in Example 1 except that the composition of the backing layer coating liquid 1 was changed to the following backing layer coating liquid 6.
The inkjet recording material of The results evaluated in the same manner as in Example 1 are shown in Tables 1 and 2.

[0088] <Back coating liquid 6> 100 parts of colloidal silica (Nissan Chemical Co., Ltd., ST-20L, average primary particle size 45 nm) Polyvinyl alcohol (Kuraray, PVA117) 55 parts Polystyrene particles 1 part   (Sekisui Plastics Co., Ltd., SBX-6, average particle size 6 μm) Boric acid 11 parts

Comparative Example 1 An ink jet recording material of Comparative Example 1 was obtained in the same manner as in Example 3 except that 4 parts of boric acid was used as the backing layer coating solution 2. The results evaluated in the same manner as in Example 1 are shown in Tables 1 and 2.

Comparative Example 2 An ink jet recording material of Comparative Example 2 was obtained in the same manner except that the backing layer coating solution 2 of Example 3 contained 14 parts of boric acid. The results evaluated in the same manner as in Example 1 are shown in Tables 1 and 2.

Comparative Example 3 An ink jet recording material of Comparative Example 3 was obtained in the same manner as in Example 7, except that 40 parts of polyvinyl alcohol and 8 parts of boric acid were used as the backing layer coating solution 6. The results evaluated in the same manner as in Example 1 are shown in Tables 1 and 2.

Comparative Example 4 ST-OUP (beaded shape, average particle size 90n, manufactured by Nissan Chemical Industries, Ltd.) was used as colloidal silica of the backing layer coating solution 6 in Example 7.
An inkjet recording material of Comparative Example 4 was obtained in the same manner except that it was replaced with m). The results evaluated in the same manner as in Example 1 are shown in Tables 1 and 2.

Comparative Example 5 An ink jet recording material of Comparative Example 5 was obtained in the same manner as in Example 1 except that the backing layer coating liquid 1 was used in place of the backing layer coating liquid 1. The results evaluated in the same manner as in Example 1 are shown in Tables 1 and 2.

[0094]

[Table 1] ──────────────────────────────────                Backing layer Backing layer Backing layer Backing layer                Cracks Folds Water resistance Porosity Volume% ────────────────────────────────── Example 1 ○ ○ ○ 18 Example 2 ○ ○ ○ 18 Example 3 ○ ○ ○ 31 Example 4 ○ ○ ○ 6 Example 5 ○ ○ △ 16 Example 6 ○ ○ ○ 22 Example 7 ○ △ ○ 46 ────────────────────────────────── Comparative Example 1 △ ○ × 29 Comparative Example 2 ○ × ○ 33 Comparative Example 3 ○ × ○ 52 Comparative Example 4 ○ ○ ○ 76 Comparative Example 5 ○ △ ○ 123 ──────────────────────────────────

[0095]

[Table 2] ────────────────────────────────────            Ink print density Show-through, transportability Visibility            Absorbent ink solvent ──────────────────────────────────── Example 1 ○ 2.20 ○ ◎ ○ ◎ Example 2 ○ 2.31 ○ ◎ ○ ○ Example 3 ○ 2.15 ○ ○ ○ ○ Example 4 ○ 2.18 ○ ◎ △ ◎ Example 5 ○ 2.18 ○ ○ ○ ◎ Example 6 ○ 2.16 ○ ◎ ○ ○ Example 7 ○ 2.18 ○ △ ○ △ ──────────────────────────────────── Comparative Example 1 ○ 2.16 ○ ○ ○ ○ Comparative Example 2 ○ 2.19 ○ ○ ○ ○ Comparative Example 3 ○ 2.17 ○ △ ○ △ Comparative Example 4 ○ 2.15 ○ × ○ × Comparative Example 5 ○ 2.18 × × × △ ────────────────────────────────────

Results: Example 2 is a case where the ink receiving layer is composed of two layers and alumina hydrate is used as the upper layer, but the visibility is slightly lowered, but other characteristics are excellent as in Example 1. It was Examples 3 and 4 are cases in which the amount of polyvinyl alcohol in the coating solution for the backing layer in Example 1 was 60 parts and 280 parts, respectively. In Example 3, the show-through of the solvent and the visibility are shown in Example 1.
It was slightly lower than that in Example 4, and the transportability was slightly lowered in Example 4, but the other properties were excellent as in Example 1. Example 5,
6 is a case where the amount of boric acid in the backing layer coating solution in Example 1 was 8 parts and 20 parts, respectively, but in Example 5, water resistance and show-through of the solvent were slightly reduced, and Example 6 was as good as Example 1 except that the visibility was slightly reduced. In Example 7, the average primary particle size of the colloidal silica of Example 1 was 4
5 nm instead of coarse one, polyvinyl alcohol amount 55
However, the properties were the same as in Example 1 except for the breakability, the show-through of the solvent, and the visibility being slightly lowered. The recording materials of Examples 1 to 7 had good blocking resistance at high humidity.

Comparative Examples 1 and 2 are cases in which the amount of boric acid in the coating liquid for the backing layer in Example 3 was 4 parts and 14 parts, respectively. In Comparative Example 1, cracking of the backing layer was reduced and water resistance was improved. In Comparative Example 2, breakability of the backing layer was aggravated. In Comparative Example 3, the polyvinyl alcohol of the backing layer coating liquid was set to 40 parts and the amount of boric acid was set to 8 parts in Example 7, but the creases in the backing layer were aggravated. Comparative Example 4 is a case where the colloidal silica in Example 7 was replaced with a beaded one having an average particle size of 80 nm, but the show-through of the solvent and the visibility were deteriorated. Comparative Example 5 is a case in which the ink receiving layer coating liquid of Example 1 was applied as the backing layer coating liquid, but the backing layer had reduced creases, and the show-through of ink and solvent and the transportability were poor. The high-humidity blocking properties of Comparative Examples 1 to 5 are as follows.
The recording material of Comparative Example 5 was good except that the recording material slightly deteriorated.

[0098]

As is apparent from the above results, according to the present invention, there are no surface defects such as cracks, excellent light transmission, printer transportability, ink absorbability, and print density, and a back coating during manufacturing or handling. Layer breakage is less likely to occur,
It is an inkjet recording material with good show-through of a printed image, and an inkjet recording material with excellent visibility can be obtained even when used in a backlight system for medical applications.

Claims (11)

[Claims] 1. An ink jet having at least one ink-receiving layer on one side of a light-transmissive support and at least one backing layer containing colloidal silica, a hydrophilic binder, and a crosslinking agent on the opposite side. In the recording material, the backing layer contains a hydrophilic binder in a solid content of 50 to 300% by mass with respect to colloidal silica and a crosslinking agent in a solid content of 8 to 20% by mass with respect to the hydrophilic binder, An inkjet recording material having a porosity of 70% by volume or less. 2. The ink jet recording material according to claim 1, wherein the colloidal silica of the backing layer has an average primary particle diameter of 5 to 40 nm. 3. The ink jet recording material according to claim 1, wherein the backing layer has a porosity of 55% by volume or less. 4. The inkjet recording material according to claim 1, wherein the hydrophilic binder of the backing layer is polyvinyl alcohol or a modified product thereof. 5. The inkjet recording material according to claim 1, wherein the crosslinking agent of the backing layer is at least one of boric acid and borate. 6. The solid content of the backing layer is 1 to 10 g /
The inkjet recording material according to claim 1, wherein the inkjet recording material is m ² . 7. The ink receiving layer according to claim 1, which contains at least one of fumed silica, alumina, and hydrated alumina having an average primary particle size of 5 to 30 nm as inorganic fine particles. The inkjet recording material according to any one of claims. 8. The ink jet recording material according to claim 7, wherein the ink receiving layer contains a hydrophilic binder in a solid content of 8 to 30 mass% with respect to the inorganic fine particles. 9. The ink receiving layer has an average particle size of 5 to 20.
The inkjet recording material according to any one of claims 1 to 8, which contains at least one kind of an inorganic pigment and an organic pigment having a thickness of µm. 10. The thickness of the light transmissive support is 80 to 2
The inkjet recording material according to claim 1, having a thickness of 50 μm. 11. The ink jet recording material according to claim 1, wherein the light transmissive support is a polyester film.