JP2003039817A - Ink jet image recording material and method for recording image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet image recording material which can be effectively applied to an ink jet printing system, which can be stably conveyed in the system and which has excellent quality and to provide a method for recording an image capable of forming the image in a simple man-hour by using this material. SOLUTION: The ink jet image recording material is used for a recording system for continuously recording on a recording material by an ink jet system based on image information for representing the image to be recorded on a recording medium. The recording material comprises an ink image acceptive layer, an image protective layer having a porous resin structure containing a thermoplastic resin latex having the lowest film forming temperature (MFT) of 50 deg.C or higher and containing 60% or less of a solid mass of the acceptive layer on the acceptive layer on a support, and a back coating layer provided on a surface of the support to an opposite side to the surface of the support having the acceptive layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet image recording material and an image recording method using this image recording material, and more particularly, it is based on image information such as color electrophotographic film or digital camera. The present invention relates to an inkjet image recording material suitable for recording and an image recording method using the image recording material.

[0002]

2. Description of the Related Art Electrostatic transfer method, sublimation heat transfer method, inkjet method by digitizing image formation by popularization due to high quality, general speed, and low cost of color image in color image formation with silver salt color sensitive material. For example, full-color image creation methods are rapidly spreading. The method using a silver salt color sensitive material is excellent in image quality such as color reproducibility, image sharpness, image density, glossiness, and image durability, and is one of the goals of developing an inkjet method. There is.

The ink jet system is relatively easy to realize full color by inputting digital information of a color original image, selection of ink species, etc., and is advantageous in that printing noise is relatively low as compared with other systems. However, the ink used contains a relatively large amount of water or solvent, and the absorption and removal of the droplets, beading of continuous ejection of fine unit droplets, prevention of sharpness deterioration due to bleeding, and silver salt color Unlike image formation in a film of a light-sensitive material, image formation is performed by ejecting an ink containing a dissolved or dispersed dye, and protection of the image and improvement of durability are particularly required.

Conventionally, a general paper and a sheet further provided with a waterproof resin layer have been used as a substrate of the recording support. Examples of such a substrate include, for example, JP-A-59-22.
Examples thereof include a printing sheet described in No. 683. Further, a resin film, for example, a polyester described in JP-A-59-222381, a transparent film such as cellulose acetate, a film filled with a white pigment, a synthetic paper, or the like is used. A transparent or opaque substrate described in JP-A No. 11-5362, which is integrated with a layer provided on the surface of an ink-absorbent paper, a porous resin film, or the like to improve the ink absorbency and heat. Depending on the treatment, it is used as an oxygen barrier support.

JP-A-59-222381, JP-A-59
-22683, JP-A-8-2090, JP-A-9-1
04163, JP-A-11-5362, and JP-A-2000.
-43368, JP-A-2000-43369, etc.
It is described that an ink image receiving layer is provided on a substrate and an image protective layer or the like is provided on the surface thereof. In addition, JP-A-7-23
7348, JP-A-9-104163, JP-A-9-1
JP-A-56206 and JP-A-11-5362 describe that an ink image-receiving layer is provided with a hydrophilic binder and a porous adsorbent which easily adsorbs and fixes the ink.

Further, JP-A-59-215885, JP-A-59-103782 and the like disclose a protective layer formed by laminating coating on the surface of an ink image-receiving layer, and JP-A-62-62.
-59076, JP-A-62-56184 and the like, especially JP-A-1-291990, describe that a protective layer is provided on the surface of the ink image-receiving layer by laminate coating, polymer solution coating or extrusion method. Further, JP-A-7-237348, JP-A-8-2090, and JP-A-2000-43368 also describe a method in which after forming an image using a porous polymer layer, heat treatment is performed to provide a protective layer. There is. However, in these methods, the durability of the surface of the recording material before the heat treatment is not sufficient, and improvement in this durability is desired. JP-A-2000-225695
JP-A No. 2003-242242 and the like describe a method of ejecting droplets for protecting a formed image by an inkjet so that the droplets adhere to the image forming surface. However, in this method, the method of providing the image protective layer after the image formation is not preferable in terms of the number of steps and the manufacturing cost.

An ink jet type recording system for efficiently recording an excellent image corresponding to a system for printing on a silver salt color sensitive material from an original image from the silver salt color sensitive material and a recording material used therefor have been found. Absent. In order to continuously and efficiently record the input image information by the inkjet method, it is necessary to specially devise the image recording material. For example, in order to continuously output a large number of images using a sheet-shaped recording medium, it is necessary to stack and store a large number of sheet-shaped recording media.

When a large amount of sheet-shaped recording medium is conveyed, a conveyance error may occur, which may cause continuous output to stop. This phenomenon is
When storing a large number of sheet-shaped recording media,
This is due to the adhesion of sheet-shaped recording media that are in contact with each other. These problems are more likely to occur as a number of sheet recording media are stacked. Therefore, in order to continuously perform a large number of recordings, it has been desired to solve these problems.

[0009]

SUMMARY OF THE INVENTION The object of the present invention can be effectively applied to an ink jet printing system, and
An object of the present invention is to provide an inkjet image recording material having excellent transportability in a system and an image recording method capable of forming an image with a simple man-hour using the image recording material.

[0010]

The above objects can be achieved by the following inventions. <1> An inkjet image recording material for use in a recording system for recording on a recording material by an inkjet method based on image information representing an image to be recorded on a recording medium, comprising an ink image receiving layer and an ink image receiving layer on a support. An image protective layer having a porous resin structure containing a thermoplastic resin latex having a minimum film-forming temperature (MFT) of 50 ° C. or more on the layer and 60% or less of the solid mass of the layer is provided, and the ink image receiving of the support is performed. An ink jet image recording material comprising a back coat layer provided on the surface opposite to the surface provided with the layer. <2> The inkjet image recording material according to <1>, wherein the back coat layer contains a component selected from a resin latex, an inorganic matting agent and a lubricant. <3> The inkjet image recording material according to <1> or <2>, wherein the ink image receiving layer is a layer having a plurality of porous structures made of inorganic fine particles. <4> The ink image receiving layer contains fine particle silica and /
Alternatively, the inkjet image recording material according to <3>, which has at least two layers having a porous structure containing an alumina hydrate and a hydrophilic binder. <5> The inkjet image recording material according to any one of <1> to <4>, wherein the lubricant is a silicone-based surfactant or a fluorine-based surfactant. <6> An image recording method in which a sheet-shaped image recording material is loaded by an inkjet method based on image information representing an image to be recorded on a recording medium, and images are recorded continuously or intermittently. An image recording method, wherein the material is the image recording material according to any one of <1> to <5>.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION -Inkjet Image Recording Material- Fig. 1 is a cross-sectional view of a main part showing a preferred embodiment of the inkjet image recording material of the present invention.
2 is a support, 4 is an undercoat layer, 6 is an ink image receiving layer, 8
Is an image protective layer, and 10 is a back coat layer.

[Support 2] As the support 2 in the image recording material of the present invention, either a transparent support made of a transparent material such as plastic or an opaque support made of an opaque material such as paper can be used. In order to make the most of the transparency of the colorant receiving layer, it is preferable to use a transparent support or a highly glossy opaque support.

As a material usable for the transparent support, a material which is transparent and has a property of withstanding radiant heat when used in an OHP or a backlight display is preferable. Examples of the material include polyesters such as polyethylene terephthalate (PET); polysulfone,
Examples thereof include polyphenylene oxide, polyimide, polycarbonate and polyamide. Among them, polyesters are preferable, and polyethylene terephthalate is particularly preferable. The thickness of the transparent support is not particularly limited, but is preferably 50 to 200 μm in terms of handleability.

As the highly glossy opaque support, it is preferable that the surface on the side where the ink image receiving layer is provided has a glossiness of 40% or more. The glossiness is JIS P-
8142 (value of 75 ° specular gloss test method for paper and paperboard). In particular,
The following supports may be mentioned.

For example, high gloss paper supports such as art paper, coated paper, cast coated paper, and baryta paper used for silver salt photographic supports; polyesters such as polyethylene terephthalate (PET); nitrocellulose. , Cellulose acetate, cellulose acetate such as cellulose acetate butyrate, plastic film such as polysulfone, polyphenylene oxide, polyimide, polycarbonate, polyamide, etc. were made opaque by containing a white pigment etc. (may be subjected to surface calendering treatment) High-gloss film; or a high-gloss film containing the various paper supports, the transparent support, or the white pigment is provided with a coating layer of polyolefin containing or not containing a white pigment. Support. Further, a white pigment-containing expanded polyester film (for example, expanded PET in which polyolefin fine particles are contained and voids are formed by stretching) can also be preferably mentioned.

The support may be corona discharge treated,
Those subjected to glow discharge treatment, flame treatment, ultraviolet irradiation treatment and the like may be used.

The polyethylene covering the front and back surfaces of the base paper is mainly low density polyethylene (LDPE) and / or
Alternatively, high density polyethylene (HDPE) may be used, but other LLDPE, polypropylene or the like may be partially used.

In particular, the polyethylene layer on the side for forming the ink image receiving layer is formed by adding rutile or anatase type titanium oxide into polyethylene, as is commonly used in photographic printing paper, to obtain opacity and whiteness. Those improved are preferable. Here, the content of titanium oxide is preferably 3 to 20 mass% with respect to polyethylene, and 4 to 1 is preferable.
3 mass% is more preferable.

The polyethylene-coated paper can be used as a glossy paper, or when a polyethylene is melt-extruded on the surface of a base paper for coating, a so-called embossing treatment is performed to obtain a matte surface or a matte surface obtained by ordinary photographic printing paper. It is also possible to use those having a silk surface.

In the present invention, in order to obtain the quality of the image recording material comparable to that of the silver salt color sensitive material, the whiteness and the smoothness of the current baryta paper or WP (support in which both sides of the base paper are coated with the thermoplastic resin) are required. High substrates should be used. Further, it is preferable to use a substrate in which the support itself has an oxygen barrier property after image formation.

[Undercoat layer 4] An undercoat layer is preferably provided on the support in order to enhance the adhesion between the support and the ink image-receiving layer. For the undercoat layer, a hydrophilic resin such as polyvinyl alcohol or a modified product thereof, gelatin or a modified product thereof, which has good adhesion between the surface of the support and the ink image receiving layer, is used, and a crosslinking curing agent or a thermoplastic resin latex is used. It is better to mix them. By providing such an undercoat layer, it is possible to improve the adhesion between the support and the ink image receiving layer and the water absorbency. Further, a white pigment such as barium sulfate, a fluorescent whitening agent, an antioxidant and a light stabilizer can be mixed in the undercoat layer.

[Ink image receiving layer 6] This layer has a function of absorbing ink applied by an ink jet with a small amount of bleeding, adsorbing a dye and holding an image. An inorganic pigment that adsorbs a dye, a binder that has good ink permeability and does not hinder pigment adsorption, and a thermoplastic resin latex that protects an image are mainly used. In order to enhance the absorption of water, to adsorb and fix the image forming dye in a specific layer, and to obtain an image with less bleeding and beading, it is desirable that the ink image receiving layer has a multilayer structure of two or more layers. For example, it is desirable to provide a water absorbing layer on the layer closer to the support (first layer) and a layer for adsorbing and fixing the dye on the layer further away from the support (second layer). .

As the inorganic pigment that adsorbs the dye, silica,
Known materials such as calcium carbonate, calcium sulfate, diatomaceous earth, calcium silicate, colloidal silica, alumina, pseudo-boehmite, colloidal alumina, and alumina hydrate are used. Alumina hydrate, silica, colloidal silica and the like are particularly preferable. These inorganic pigments are formed in a void shape in the ink image receiving layer to adsorb the dye and prevent ink bleeding.

The alumina hydrate can be produced by a known method such as hydrolysis of aluminum alkoxide and hydrolysis of sodium aluminate. The shape thereof is not particularly limited, such as cilia, needle, plate, or spindle, and may or may not have orientation. As the alumina hydrate used in the present invention, those commercially available, or those processed from their raw materials can be used, and the characteristics of these alumina hydrates are transparency and gloss. Further, it is more preferable that it has a high dye fixing property, does not have cracks during the formation of a film, and has a good coating property. Examples of commercially available products include A manufactured by Catalyst Kasei Co., Ltd.
S-2, AS-3, 520 manufactured by Nissan Chemical Co., Ltd. and the like can be mentioned. These alumina hydrates usually have a fine particle diameter of 1 μm or less and have excellent dispersibility, and therefore can give a recording medium excellent smoothness and gloss.

The binder for binding the inorganic pigment can be freely selected from water-soluble polymers. For example, polyvinyl alcohol or a modified product thereof,
Starch or a modified product thereof, gelatin or a modified product thereof, casein or a modified product thereof, gum arabic, cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropylmethyl cellulose, SBR latex, NBR latex, methyl methacrylate-butadiene copolymer, etc. Conjugated diene-based copolymer latex, functional group-modified polymer latex, vinyl-based copolymer latex such as ethylene-vinyl acetate copolymer, polyvinylpyrrolidone, and acrylate copolymer are preferable. These binders may be used alone or in combination of two or more.

The mixing ratio of the inorganic pigment, particularly alumina hydrate, and the binder is a mass ratio, preferably 1: 1 to 30 :.
1, more preferably from 5: 1 to 25: 1. When the amount of the binder is less than the above range, the mechanical strength of the ink image receiving layer may be insufficient, and cracking or powder falling tends to occur. Further, if the mixing ratio of the binder to the inorganic pigment, especially alumina hydrate is higher than the above range, the pore volume may be reduced and the ink absorptivity may be lowered.

The coating liquid for forming the ink image receiving layer contains, in addition to the alumina hydrate and the binder, a dispersant, a thickener, a pH adjusting agent, a lubricant, a fluidity modifier, if necessary. It is also possible to add a surface active agent, a defoaming agent, a water resistance agent, a release agent, an optical brightening agent, an ultraviolet absorber, an antioxidant and the like.

The coating amount of the inorganic pigment, especially alumina hydrate, on the substrate is 10 g in order to have the dye fixing property.
/ M ² or more is preferable, when the substrate does not have ink absorbability, the coating amount is more preferably in the range of 30 to 50 g / m ² , and when the substrate has ink absorbability, the coating amount is The range of 20 to 40 g / m ² is more preferable. The coating / drying method is not particularly limited, but the alumina hydrate and the binder may be subjected to a baking treatment, if necessary. By carrying out such a baking treatment, the binder crosslinking strength is increased, the mechanical strength of the ink receiving layer is improved, and the surface gloss of the alumina hydrate layer is improved.

In addition, silica or colloidal silica can be effectively used as an inorganic pigment in the ink image-receiving layer to form a porous structure like alumina hydrate. In this case, the binder may be, for example, JP-A-61 / 1986.
In addition to those described in JP-A-10483, cationically modified polyvinyl alcohol or a copolymer thereof can be used.

[Image Protecting Layer 8] The image protecting layer 8 is provided on the ink image receiving layer to protect the physical strength of the ink image receiving layer and improve the durability and weather resistance of the image. Together with the back coat layer, it serves to improve the transportability of the ink jet recording image recording material and prevent the peeling of the layer due to the adhesion of the ink image receiving layer. The image protection layer preferably forms a porous resin layer using a thermoplastic resin latex, and the latex preferably has a specific particle distribution. This thermoplastic resin latex has a minimum film forming temperature (MFT) of 50 ° C. or higher. The minimum film-forming temperature (MFT) of the thermoplastic resin latex is the temperature at which the image-protecting layer is film-formed by heat treatment and becomes transparent, preferably 50 ° C to 200 ° C, more preferably 80 ° C.
To 150 ° C. When the minimum film forming temperature (MFT) of the thermoplastic resin latex is less than 50 ° C., the latex may be melted in the storage state before printing, which may cause problems such as adhesion. The average particle size of the thermoplastic resin latex is 0.1 to 10 μm, preferably 0.3 to 5 μm.
m, more preferably 0.3 to 3 μm. The particle size distribution is preferably a monodisperse distribution, which is ± 2 of the average particle size.
A latex having uniform particles such that 90% or more of the particles are in the range of ⅓, preferably in the range of ± 1/3 is preferable. In particular, it is preferable that fine particles of latex do not enter. Further, the image protective layer contains a thermoplastic resin latex in an amount of 60% or less, preferably about 10 to 60% of the solid mass, does not impede ink permeability, and becomes a transparent resin film by heat treatment after image formation. Things are desirable. If the thermoplastic resin latex in the image protective layer exceeds 60% by weight of the solid mass, it is not preferable in view of impairing ink permeability.

The thermoplastic resin latex used in the image protective layer has a minimum film forming temperature (MFT) of 50 ° C. or higher, and is made non-porous by the heat treatment during image recording to form an image, thereby protecting the image. A resin having the above property, particularly a resin containing a component having high ultraviolet absorption is preferable. For example, vinyl chloride type, vinylidene chloride type, styrene type, acrylic type, urethane type, polyester type, ethylene type material or vinyl chloride-vinyl acetate type, vinyl chloride-acrylic type, vinyl chloride-vinylidene chloride type, Vinylidene chloride-acrylic, SBR, NBR, etc. latexes, latexes of copolymers of two or more of these, such as SBR / NBR mixtures and vinyl chloride-acrylic /
Examples thereof include latex such as vinyl acetate-based mixture. In addition, it is preferable that the image protective layer contains 50% by weight or less of a component having excellent light resistance and containing a conjugated double bond component.

The image protective layer contains 10 to 3 of silica sol or the like.
It is preferable to mix 0% by mass. It has the effect of enhancing adhesion with the ink image receiving layer, preventing beading, etc., and improving sharpness.

Further, the image protective layer has a hydrophilic property which is used for the ink image receiving layer in order to optimize the adhesion with the ink image receiving layer, improve the sharpness, and maintain the physical strength of the image protective layer. It is preferable to add a binder such as polyvinyl alcohol.

The coating amount of the image protective layer is such that after image formation, heat treatment, preferably smoothing treatment, a sufficient surface gloss is given.
An amount that gives a thickness that exerts an image protection function, preferably an amount that gives a dry coating film of 1 to 10 μm, preferably 1 to 5 μm. With the smoothing treatment, after the heat film formation treatment,
It is desirable that the treatment is performed by pressing a roll having a smooth surface near the Tg temperature to smooth the surface. If necessary, the coating liquid for forming the image protective layer may include a dispersant, a thickener, a pH adjuster, a lubricant, a fluidity modifier, a surfactant, an antifoaming agent, a water-proofing agent, and a fluorescent whitening agent. It is also possible to add agents, ultraviolet absorbers, antioxidants and the like.

[Backcoat Layer 10] The backcoat layer contains a component selected from a resin latex, an inorganic matting agent and a lubricant, and is provided on the surface of the support opposite to the surface having the ink image receiving layer. . By providing a back coat layer, the transportability of the recording paper in the image recording process is improved, the ink image receiving layer is substantially protected, and the function of the image protective layer is simplified, so that an abnormal event in the image recording processing process occurs. Can be reduced.

As the monomer constituting the resin latex contained in the back coat layer, the softening point of the resin latex is preferably 30 to 150 ° C., more preferably 50 to 150 ° C.
A homopolymer composed of a single monomer or a copolymer composed of several kinds of monomers is preferably used so that the temperature becomes 120 ° C. Preferred monomers include, for example,
Olefins, α, β-unsaturated carboxylic acids and salts thereof, α, β-unsaturated carboxylic acid derivatives, amides of α, β-unsaturated carboxylic acids, styrene and its derivatives, vinyl ethers, vinyl esters, etc. Is mentioned.

Examples of olefins include ethylene, propylene, isoprene, butadiene, vinyl chloride, vinylidene chloride, 6-hydroxy-1-hexene, cyclopentadiene, 4-pentenoic acid, methyl 8-nonenate, vinyl sulfonic acid and trimethylvinylsilane. , Trimethoxyvinylsilane, butadiene, pentadiene, isoprene,
1,4-divinylcyclohexane, 1,2,5-trivinylcyclohexane and the like can be mentioned.

Examples of the α, β-unsaturated carboxylic acid and salts thereof include acrylic acid, methacrylic acid, itaconic acid, maleic acid, sodium acrylate, ammonium methacrylate and potassium itaconic acid.

Examples of the α, β-unsaturated carboxylic acid derivative include alkyl acrylates (eg, methyl acrylate, ethyl acrylate, n-butyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, n-dodecyl acrylate, etc.) and substituted alkyl acrylates. (For example, 2-chloroethyl acrylate, benzyl acrylate, 2-cyanoethyl acrylate, allyl acrylate, etc.), alkyl methacrylate (for example, methyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate, n-dodecyl methacrylate, etc.), substituted alkyl methacrylate [For example, 2-hydroxyethyl methacrylate, glycidyl methacrylate, glycerin monomethacrylate, 2-acetoxye Tylmethacrylate, tetrahydrofurfurylmethacrylate, 2-methoxyethylmethacrylate, ω-methoxypolyethyleneglycolmethacrylate (additional mol number of polyoxyethylene = 2 to 1)
00), polyethylene glycol monomethacrylate (polyoxyethylene addition mole number = 2 to 100), polypropylene glycol monomethacrylate (polyoxypropylene addition mole number = 2 to 100), 2-carboxyethyl methacrylate , 3-sulfopropylmethacrylate, 4-oxysulfobutylmethacrylate, 3-trimethoxysilylpropylmethacrylate, allylmethacrylate, etc.], derivatives of unsaturated dicarboxylic acids (eg, monobutyl maleate, dimethyl maleate, monomethyl itaconate, itaconic acid) Dibutyl etc.), polyfunctional esters (eg ethylene glycol diacrylate, ethylene glycol dimethacrylate, 1,4-cyclohexane diacrylate, pentaerythritol tet) Methacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, trimethylolethane triacrylate,
Dipentaerythritol pentamethacrylate, pentaerythritol hexaacrylate, 1,2,4-cyclohexanetetramethacrylate, etc.).

Examples of α, β-unsaturated carboxylic acid amides include acrylamide, methacrylamide, and N.
-Methyl acrylamide, N, N-dimethyl acrylamide, N-methyl-N-hydroxyethyl acrylamide, N-tert butyl acrylamide, N-tert
Octyl methacrylamide, N-cyclohexyl acrylamide, N-phenyl acrylamide, N- (2-acetoacetoxyethyl) acrylamide, N-acryloylmorpholine, diacetone acrylamide, itaconic acid diamide, N-methyl maleimide, 2-acrylamido-2- Methyl propane sulfonic acid, methylene bis acrylamide, dimethacryloyl piperazine, etc. are mentioned.

Examples of styrene and its derivatives include styrene, vinyltoluene, p-tertbutylstyrene, vinylbenzoic acid, methyl vinylbenzoate, α-methylstyrene, p-chloromethylstyrene, vinylnaphthalene, and the like.
p-Hydroxymethylstyrene, p-styrenesulfonic acid sodium salt, p-styrenesulfinic acid potassium salt, 1,4-divinylbenzene, 4-vinylbenzoic acid-
2-acryloyl ethyl ester and the like can be mentioned.

Examples of vinyl ethers include methyl vinyl ether, butyl vinyl ether and methoxyethyl vinyl ether. Examples of vinyl esters include vinyl acetate, vinyl propionate, vinyl benzoate, vinyl salicylate and vinyl chloroacetate. Other polymerizable monomers include N-vinylpyrrolidone, 2-vinyloxazoline, 2-isopropenyloxazoline, divinylsulfone and the like.

Among the hydrophobic polymers of the present invention synthesized by copolymerization combining monomers, the main component is acrylamide, methacrylamide, acrylic acid ester, methacrylic acid ester, styrene, vinyl ester, vinyl ether, olefin, etc. A polymer or a copolymer is preferably selected.

The content of the resin latex is preferably 5 to 100% by mass, more preferably 40 to 100% by mass, based on the total components of the contained layer.

The inorganic matting agent contained in the back coat layer is preferably a white pigment, and the white pigment includes
For example, calcium carbonate, kaolin, talc, clay,
Diatomaceous earth, synthetic amorphous silica, aluminum silicate, magnesium silicate, calcium silicate, aluminum hydroxide, alumina, lithopone, zeolite, barium sulfate, calcium sulfate, titanium dioxide, inorganic pigments such as zinc sulfide, zinc carbonate, styrene pigment, Acrylic pigment,
Preferable examples include organic pigments such as urea resin and melamine resin. Among these white pigments, inorganic pigments are preferable, and porous inorganic pigments having fine pores inside the pigment particles themselves are more preferable, and synthetic amorphous silica, alumina, aluminum silicate, or calcium carbonate having a large pore area. Are more preferable, and synthetic amorphous silica and alumina hydrate are particularly preferable. As the synthetic amorphous silica, both of silicic acid anhydride obtained by the dry production method and hydrous silicic acid obtained by the wet production method can be used, but it is particularly preferable to use hydrous silicic acid.

The content of the inorganic matting agent is preferably 5 to 50% by mass, more preferably 10 to 30% by mass, based on the total components of the contained layer.

As the lubricant contained in the back coat layer, a surfactant (for example, a fluorine-containing compound [including a fluorine-containing acrylic resin or the like]), a polyhydric alcohol derivative, a silicone oil dispersion, glycerin or the like. Examples thereof include derivatives, glycerol or its derivatives, and glycols (diethylene glycol, triethylene glycol, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, etc.). The content of the lubricant is preferably 1 to 50% by mass, more preferably 5 to 30% by mass, and further preferably 5 to 20% by mass with respect to the total components of the contained layer.

The resin latex and the inorganic matting agent are effective in improving the transportability of the laminated sheet-like recording materials, and the lubricant is effective in preventing the adhesion of the sheet-like recording materials in the laminated state. Therefore, in order to exhibit both the effect of improving the transportability of the sheet-shaped recording material and preventing the adhesion,
It is desirable to use a resin latex and / or an inorganic matting agent in combination with a lubricant.

The resin latex particles and the inorganic matting agent are
A dispersion such as a resin latex or inorganic pigment particles having a particle size larger than the thickness of the back coat layer can be used. The average particle size of the resin latex particles and the matting agent is 0.5 to 3 larger than the dry film thickness of the back coat layer.
0 μ is preferable, more preferably 0.5 to 10 μ, and monodisperse one is preferable. The amount is preferably such that about 10 to 30 convex portions are provided per 1 mm ² of the surface of the back coat layer.

The hydrophilic binder used in the back coat layer is a binder having good adhesion to the support or surface-treated surface, and the back coat layer coating solution is preferably applied after undercoating the support. As the hydrophilic binder, for example, gelatin or a modified product thereof, casein or a modified product thereof, polyvinyl alcohol or a modified product thereof, polyvinylpyrrolidone, polyethylene oxide, polyacrylic acid, polyacrylic acid amide, carboxymethyl cellulose, hydroxyethyl cellulose,
Hydroxypropylmethyl cellulose or a derivative thereof may be used alone or in combination of two or more. In order to enhance the adhesiveness and physical strength of the back coat layer, it is preferable to use a curing agent for the binder. For example, a curing agent such as boric acid or a salt thereof can be used for polyvinyl alcohol or a copolymer thereof, or another polymer. Further, a known curing agent such as an epoxy compound can be used for gelatin or its modified product.
The film thickness of the back coat layer is about 0.2 to 10 µ, preferably about 0.2 to 5 µ.

The ink jet type image recording material according to the present invention is particularly preferably used for recording a high quality color image. It is preferably used in an image recording system for recording continuously by an ink jet system based on an image obtained by a development processing system of a silver halide photographic light-sensitive material and image information obtained by a high quality color digital camera.

-Image recording method-The image recording method of the present invention is to use the above-mentioned inkjet type image recording material, and in particular, after the ink is printed using the inkjet type image recording material of the present invention, it is heated. Processing is desirable. This heat treatment is preferably carried out under the temperature condition and treatment time necessary for making the ink image image-receiving layer comprising a porous layer containing thermoplastic resin particles non-porous. The layer has good weather resistance such as water resistance and light resistance, and can impart gloss to the image, and at the same time, the ink that has been printed and has penetrated into the ink image receiving layer of the porous layer is made non-porous to receive an ink image receiving image. By adsorbing and fixing in the layer, the printed matter can be stored for a long period of time.

The heat treatment temperature at this time is preferably not lower than the flow temperature of the thermoplastic resin particles, more preferably not lower than the minimum film forming temperature (MFT). It is preferable that the resin is made porous and transparent, and in this case, a resin having a difference between the Tg of the resin of the thermoplastic resin particles forming the image protective layer and the minimum film forming temperature (MFT) of the thermoplastic resin latex is 10 ° C. or less. It is desirable to use latex. If the difference between the Tg and the minimum film forming temperature (MFT) of the thermoplastic resin latex is larger than 10 ° C., a sufficiently uniform protective film cannot be obtained. Therefore, the heat treatment temperature varies depending on the type of the thermoplastic resin latex and the like, but if the heat treatment temperature is too high, there is a problem in that curling occurs after the treatment or a large amount of heating energy is used. On the other hand, if the heat treatment temperature is too low, problems such as insufficient formation of the protective film and unevenness occur. The heat treatment temperature is generally 60 to 180.
C. is preferable, and more preferably 80 to 130.degree.

As means for applying such an image recording method, it is desirable to have at least means for printing the ink on the image recording material of the present invention and then heat-treating the printed image recording material at a predetermined temperature. Further, it is desirable to use an image recording system in which a large number of sheet-shaped ink jet recording image recording materials can be stacked and loaded, and printing can be performed while continuously or intermittently feeding the sheet-shaped ink jet recording image recording materials one by one. .

Further, the ink jet type image recording material according to the present invention is preferably used for recording a high quality color image. In this case, the image recording apparatus has the above heat treatment means, can be loaded with a sheet-shaped inkjet recording image recording material, and can be printed while feeding the sheet-shaped inkjet recording image recording material. An image recording system for continuously recording by an inkjet method based on an image obtained by a development processing system of a silver halide photographic light-sensitive material, image information obtained by a high quality color digital camera, etc. It is preferably used. For example, Japanese Patent Application No. 2000-3615
It is preferably used as a recording material of the image recording apparatus described in No. 18.

This image recording apparatus, as shown in FIG.
As an input device for inputting image data, a film scanner 12, a media driver 14, and an image data receiving device 16 are respectively provided, and an image processing device 18 for processing the image data input from the input device is provided. As an output device that outputs image data (or an image) that has been processed by the device 18, an inkjet printer 20 that records an image by an inkjet recording method is provided.

The media driver 14 is, for example, a magnetic disk such as a floppy (registered trademark) disk (FD) or a C disk.
Various information such as optical discs such as D-R, magneto-optical discs (MO), PC cards that can be loaded into digital still cameras (DSC), smart media, IC cards (hereinafter, these are collectively referred to as "digital camera cards") One of the storage media is set, and the image data stored in the set information storage medium is read and output. Also,
The image data receiving device 16 is connected to a computer network such as the Internet, receives R, G, B image data from an information processing device (for example, a personal computer (PC)) via the computer network, and receives the received image. Output the data.

The film scanner 12 uses the photographic film 3
8 (For example, a negative image or a positive image visualized by developing after photographing a subject, which is recorded on a photographic light-sensitive material (hereinafter simply referred to as photographic film) such as a negative film or a reversal film) Is read out and the image data obtained by the reading is output, and the light emitted from the LED light source 30 and having the light amount unevenness reduced by the light diffusion box 34 is reflected on the photographic film 38 set on the film carrier 36. The light irradiated and transmitted through the photographic film 38 is configured to form an image on the light receiving surface of the area CCD sensor 42 (may be a line CCD sensor) via the lens 40.

The film carrier 36 intermittently conveys the photographic film 38 so that the film image is sequentially positioned on the optical axis (reading position) of the light emitted from the LED light source 30. The LED light source 30 includes a large number of LEDs that emit R light,
A large number of LEDs that emit G light, a large number of LEDs that emit B light, and a large number of LEDs that emit IR light are arranged on the entire surface of a substrate (not shown) at a constant and high density. It is driven by a driver (not shown) so as to sequentially emit R, G, and B lights while one image is located at the reading position.

As a result, the film images recorded on the photographic film 38 are sequentially read by the CCD sensor 42, and the CCD sensor 42 outputs R, G, B, and IR signals corresponding to the film image. The signal output from the CCD sensor 42 is converted into digital image data by the A / D converter 44 and input to the image processing device 18. The film scanner 12 is provided with a scanner control unit 28, and the operation of each unit of the film scanner 12 is controlled by the scanner control unit 28.
Further, each film image may be read a plurality of times (for example, a prescan for reading a film image at a relatively low resolution and a fine scan for reading a film image at a relatively high resolution).

Further, as the input device according to this embodiment,
The above-described film scanner 12 is a reflection-type scanner that reads a reflection original (for example, color paper on which an image is recorded) and outputs the image data obtained by the reading.
It may be provided separately. As this reflection type scanner, a scanner provided with an automatic supply mechanism that automatically and sequentially supplies a plurality of reflection originals to a reading unit of the scanner so that a plurality of reflection originals can be automatically and continuously read It is preferable to use.

The film scanner 12, the media driver 14, and the image data receiving device 16 are connected to the image processing device 18.
Image data output from these image data input devices are input to the pre-processing unit 44. The preprocessing unit 44 performs different predetermined preprocessing on the input image data depending on the image data input source. Examples of preprocessing for the image data input from the film scanner 12 include dark correction, density conversion, shading correction, defective pixel correction, and the like. Also,
Examples of preprocessing for the image data input from the media driver 14 include decompression of image data compressed and recorded in an information storage medium and image processing such as sharpness improvement. Further, as the preprocessing for the image data input from the image data receiving device 16, for example, decompression of the compressed image data (for example, JPEG format image data) received by the image data receiving device 16 can be cited.

The pre-processing unit 44 is connected to the image processing unit 48 via the image memory 46, and the image data subjected to the pre-processing by the pre-processing unit 44 is temporarily stored in the image memory 46 and then the image processing unit 48. The data is read by 48 and input to the image processing unit 48. Based on the image data read from the image memory 46, the image processing unit 48 automatically determines the processing conditions of various image processing for the image data by calculation (setup calculation).

The image processing executed by the image processing unit 48 includes, for example, gray balance adjustment of an image, density adjustment, gradation control, hypertone processing for compressing the gradation of an extremely low frequency luminance component of an image, and granularity. Hyper sharpness processing that enhances sharpness while suppressing IR, IR
The image processing for improving the image quality of the output image, such as the defect portion correction processing for correcting the defect portion of the image data due to the scratches on the photographic film or the adhesion of foreign matter on the basis of the data of 1. In addition, image processing that intentionally changes the image tone (for example, image processing that finishes the output image to portrait tone) and image processing that processes the image (for example, make a person present in the original image slender on the output image). Image processing such as image processing for finishing) may be executable.

Further, the image processing section 48 performs various image processing on the image data read from the image memory 46 according to the processing conditions determined by the setup calculation.
The image processing unit 48 is connected to the image data storage unit 54 of the inkjet printer 20, and the image data for which various image processes have been completed is transferred to the image data storage unit 54 as recording image data and temporarily stored.

The image processing device 18 includes a CPU, RO
The M, the RAM, and the input / output port are connected to each other via a bus, and the input / output port includes a PC having a storage device such as a hard disk device (HDD). CRT5 is used for the input / output port of the PC.
0 and an input device 52 including a keyboard and a mouse are connected. The preprocessing unit 44 and the image processing unit 4 described above
8 can be realized, for example, by causing a PC to execute a predetermined program, but may be configured to include dedicated hardware that executes various image processes.

In addition, the image processing is performed on the image data based on the image processing conditions obtained by the setup calculation, and the image data after the image processing is output to the CRT 50 to estimate the finish of the output image. By displaying the image on the CRT 50, the operator verifies the processing condition obtained by the setup calculation, and when the correction of the processing condition is instructed through the input device 52, the processing condition is corrected according to the instruction. You may

On the other hand, the image data storage unit 54 of the ink jet printer 20 is connected to a printer control unit 56 including a microcomputer. The printer control unit 56 is the scanner control unit 2 of the film scanner 12.
8. Connected to the image processing unit 48 of the image processing device 18. A recording head 60 is connected to the printer control unit 56 via a driver 58, and a recording material conveying unit 62, a heating processing unit 64, and an image reading unit 66 are also connected.

As shown in FIG. 3, the ink jet printer 20 has a box-shaped paper feed casing 68 detachably attached to the bottom of the casing, and the image recording material 70 of the present invention is placed in the box-shaped paper feed casing 68. Are stored in a stacked state. These image recording materials 70 are sent out by a hopping roller 72 via a drive mechanism (not shown), conveyed by registration rollers 76 and 78 through a guide 74, and then arranged on the downstream side in the drawing direction of the image recording material 70. Rollers 80, 82, 8 with motors for synchronized transport of rollers
It is conveyed toward the other end side of the housing by 4,86.

Further, sensors 90 and 92 each consisting of a pair of a light emitting element and a light receiving element are provided on the upstream side and the downstream side of the registration roller 78 for transporting the image recording material 70.

When the sensor 90 does not detect the recording material 70 (the light emitted from the light emitting element is received by the light receiving element without being blocked by the recording material), the printer controller 56 receives the registration roller 74. When the sensor 90 detects the image recording material 70 by rotating the, the sensor 90 detects the image recording material 70 (the light emitted from the light emitting element is blocked by the lowermost part of the loop of the recording material 70 to receive light). When the element does not receive light), the rotation of the registration roller 74 is stopped and the withdrawal of the image recording material 70 from the box-shaped paper feed casing 68 is repeated.

The printer control unit 56 drives the synchronous conveying motor so that the image recording material 70 is conveyed in synchronization with the image recording on the image recording material 70 by the recording head 60, and the roller synchronous conveying motor is provided. Rollers 80, 82, 8
4, 86 are driven to rotate.

A roller 80 with a motor for roller synchronous conveyance,
The recording head 60 is arranged above the recording head 82. Ink of different colors (for example, C, M, Y, and BK) is stored in a plurality of main tanks (not shown), and is supplied to each nozzle row of the recording head 60 via the ink chamber. As a result, ink of different colors is ejected from each nozzle for each nozzle row.

A 3-line CCD sensor (an area sensor may be used) 98 for reading a color image (output image) recorded on the image recording material 70 is arranged between the conveying rollers 84 and 86. There is. The CCD sensor 98 constitutes a part of the image reading unit, and the image signal output from the CCD sensor 98 is supplied to an amplifier included in the image reading unit.
An output image data representing an output image is input to the printer control unit through an A / D converter and a correction unit that performs correction such as dark correction.

On the other hand, as the ejection method for ejecting the ink from the nozzle, an arbitrary method can be adopted from among various known ejection methods. For example, as a typical method, a piezoelectric element attached to an ink chamber is used. A pulse voltage is applied to the piezoelectric element to deform the piezoelectric element to change the ink fluid pressure in the ink chamber, and the change in ink fluid pressure is used to eject ink droplets from the nozzle. It is possible to employ a thermal method or the like in which the ink is heated by the heating element and the ink droplets are ejected from the nozzles by the bubbles generated in the ink chamber by the heating. It should be noted that the print head 60 has a pump for sucking ink in all the ink chambers inside the print head 60 by generating a negative pressure in order to clear the clogging of the nozzle ejection port.
(Not shown) is also attached.

When the image recording material of the present invention is applied to the image recording apparatus shown in the drawing, the image recording material 70 is conveyed when the sheet-shaped image recording material 70 is conveyed in the image recording apparatus.
Since the back coat layer provided on the back surface of the sheet contains at least one of a resin latex, an inorganic matting agent, and a lubricant, the back coat layer and the image protective layer do not come into close contact with each other, and a conveyance failure does not occur. The recording material is normally conveyed in the image recording apparatus, and an image defect due to a conveyance defect does not occur. The recording head 6 is attached to the image recording material 70.
After printing the ink from 0, the porous layer of the image protection layer can be made non-porous by heat-treating it in the heat-treatment section 64, and as a result, the surface property and transparency of the surface of the image recording material 70 are improved, and By adsorbing and fixing the printed ink in the ink image receiving layer, the durability and weather resistance of the image recording material can be improved and the image can be sharpened.

If the image recording apparatus shown in the figure is used,
As an event that hinders image recording, for example, a malfunction of the recording unit (specifically, clogging of the ejection port of the recording head, decrease in ejection amount of recording liquid droplets from the ejection port of the recording head, or other event), Even when the free space of the storage means for storing the image information decreases, depending on the monitoring means, it can be configured to monitor whether or not at least one of the above events has occurred. The means can perform processing for removing the fault or the event when the monitoring means determines that the event has occurred. Thereby, even when the above-mentioned phenomenon occurs while the recording unit continuously records a plurality of images on the recording medium, this is detected and the obstacle of the image recording is eliminated or The obstructive event itself is removed,
It is possible to prevent a large number of images with improper image quality from being recorded after the occurrence of the event or prevent the image recording from being stopped for a long time due to the occurrence of the event. Therefore, it is possible to achieve high performance of image recording and improvement of the ratio of proper images by the inkjet recording method.

EXAMPLES Examples of the present invention will be described, but the present invention is not limited thereto. [Example 1] 1. 1. Preparation of Inkjet Recording Material of the Present Invention 1.1 Preparation of Backcoat Layer and Undercoat Layer on Support (Preparation of Backcoat Layer) Polyethylene double-sided laminate having a constitution used for producing ordinary color photographic paper A paper support (thickness 100 μm) was used. Corona discharge treatment is applied to both surfaces of this surface.

(1) Preparation of Backcoat Layer 0.3% by mass of an epoxy curing agent was added to a 5% by mass gelatin aqueous solution, and monodisperse distribution particles of modified polyethylene having an average particle size of about 5 μ (manufactured by Sumitomo Chemical Co., Ltd.). ) About 3% by mass
Was added. Furthermore, 0.1% by mass of a fluorine-containing acrylic resin-based aqueous emulsion (manufactured by Asahi Glass) was added and stirred to obtain a coating liquid for backcoat layer. This coating liquid was applied to the back surface of the support to form a back coat layer having a thickness of about 5 μm.

(2) Preparation of undercoat layer 5% by mass containing sodium dodecylbenzene sulfonate
A coating liquid for undercoat layer was obtained by adding 0.3% by mass of an epoxy type curing agent to an aqueous gelatin solution. This coating solution was applied on the surface of a support to form an undercoat layer having a thickness of about 0.5 μm.

1-2 Preparation of Ink Image Receiving Layer Boehmite sol 100 having a crystal thickness in the (020) plane direction of 80 μm and a secondary agglomerated particle diameter of 1.5 to 4 μm synthesized by the hydrolysis method of aluminum isoproxide. 11 parts by mass of polyvinyl alcohol (both in terms of solid content) and water were added to parts by mass to prepare a coating liquid for an ink image receiving layer. This coating solution was applied onto the surface of the undercoat layer so as to form a coating film having a dry film thickness of 30 μm. The coating film thus formed has a pore size of the alumina hydrate porous layer of 50
It was a millimicron transparent porous film.

1-3 Preparation of image protective layer (1) Acrylonitrile / vinylidene chloride / acrylic acid (mass ratio 15/79/6): (P-1) synthesis (1) 230 g of distillation in a 400 ml eggplant-shaped flask Water, (2) 0.8 g Triton-770, (3) 1
2.34 g of acrylonitrile, (4) 4.93 g of acrylic acid, (5) 64.96 g of vinylidene chloride,
(6) 0.204 g of potassium metabisulfite and (7) 0.102 g of potassium persulfate were sequentially added.
The flask was sealed, shaken at 30 ° C. and placed for 18 hours. The polymerization mixture was freed from volatile residual monomers for 15 minutes at room temperature under reduced pressure. (Tg: 46 ° C.) The particle size and distribution of the latex obtained by changing the amount of the emulsifier Triton-770 and the speed of shaking were measured with Microtrac UPA (manufactured by Nikkiso Co., Ltd.), and the desired one was used. Was selected. Sample P-1 has an average particle size of about 0.8 μ.
It is a monodisperse distribution resin latex in which 90% or more of particles are contained in a diameter range of m, 0.5 to 1.1 μm. The minimum film forming temperature (MFT) of this resin latex is 60 ° C to 120 ° C.

(2) Thermoplastic resin latex sample P-1
8 mass% equivalent amount of polyvinyl alcohol and 2 mass% of silica sol having an average particle diameter of about 0.05 μm are mixed with a coating liquid containing the above to obtain a coating liquid, which is dried at 50 ° C. to about 6 μm.
A thick porous resin layer is coated, and recording material sample No. Got 1. In addition, the thermoplastic resin latex sample P-1 was adjusted to be 5 to 45% of the solid mass of the image protective layer.

[Comparative Example 1] The sample No. Sample N except that the back coat layer is not provided in the manufacturing process of 1.
o. Comparative recording material sample a was obtained in the same manner as in the preparation of 1.

2. Image formation Inkjet image recording material N obtained by the present invention
o. 1 (sheet form) was loaded in the image recording apparatus shown in FIGS. The heat treatment unit 64 in the figure is 120-
It was set at 140 ° C.

3. Evaluation 3-1 Evaluation item (1) Transportability The image information input to the image data storage unit was connected, 10 sheet-like recording materials were continuously recorded, and the order of transportability was observed. . (2) Abrasion resistant recording materials are stacked so that the image protective layer and the back coat layer are aligned with each other, a weight of 1 kg is placed on the material, the intermediate material is taken out, and the degree of friction is visually observed. (3) Image quality The image obtained is subjected to visual comparison and observation to determine the hue, sharpness,
Observe for scratches. (4) Weather resistance The image recorded matter was left outdoors (including in direct sunlight) for 10 days, and the change in the image was visually observed. Common evaluations of (1) to (4) ◎ Particularly excellent ○ Better than △ △ Slightly inferior in practical use × Inferior 3-2 Evaluation result

[0086]

[Table 1]

[Examples 2 to 4] Image recording material sample No. 1 of Example 1 The image recording material No. 1 was the same as in Example 1 except that the constitution of the back layer was changed as shown in Table 2. 2. Image recording material No. 3, image recording material No.
Got 4. Table 2 shows the results of evaluation performed in the same manner as in Example 1.

[0088]

[Table 2]

[Embodiment 5] Image recording material No. In the image protection layer of No. 1, the following thermoplastic resin latex sample P-2 was used instead of the thermoplastic resin latex sample P-1, and 2% by mass of silica sol having an average particle diameter of about 0.05 μm was used.
Except that polyvinyl alcohol was not used and a coating solution was prepared in the same manner as in Example, dried at 60 ° C., and a porous resin layer having a thickness of about 5 μm was coated to form an image recording material N.
o. Got 5. This thermoplastic resin latex sample P-2
The minimum film forming temperature (MFT) is 60 ° C to 120 ° C. In addition, the thermoplastic resin latex sample P-2
Was adjusted to be 5 to 45% of the solid mass of the image protective layer. Thermoplastic resin latex sample P-2 Acrylonitrile / vinylidene chloride / acrylic acid mass ratio 39/69/2 (Tg 79 ° C.) Image recording material No. Table 3 shows the results of evaluation of No. 5 in the same manner as in Example 1.

[0090]

[Table 3]

Comparative Example 2 Preparation of Recording Comparative Material b Recording Material Sample No. 5, except that the back coat layer was not provided. A recording comparative material b was prepared in the same manner as in No. 5. The results of evaluation of the recording comparative material b in the same manner as in Example 1 are shown in Table 4.

[0092]

[Table 4]

[0093]

INDUSTRIAL APPLICABILITY According to the ink jet image recording material and the image recording method of the present invention, the image by the ink jet method is continuously formed (as in print production by photofinishing), and the sheet-like image recording material is stably and quickly You can record efficiently. Since a specific back coat layer is provided, it prevents the ink image receiving layer in the form of a sheet from adhering to the back, protects the image layer, and conveys without any abnormalities, and continuously stabilizes high-quality images. Can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a preferred embodiment of an inkjet image recording material of the present invention.

FIG. 2 is a schematic configuration diagram showing an example of an image recording system used in the image recording method of the present invention.

FIG. 3 is a detailed configuration diagram of a main part of FIG.

[Explanation of symbols]

2 support 4 Undercoat layer 6 Ink image receiving layer 8 Image protection layer 10 Back coat layer 20 inkjet printer 60 recording head 64 Heat treatment section 70 Image recording materials

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C056 FC06                 2H086 BA14 BA15 BA24 BA31 BA33                       BA35 BA36 BA41

Claims (6)

[Claims] 1. An inkjet image recording material used in a recording system for recording on a recording material by an inkjet method based on image information representing an image to be recorded on a recording medium, the ink image receiving layer on a support. And an image protection layer having a porous resin structure containing a thermoplastic resin latex having a minimum film-forming temperature (MFT) of 50 ° C. or more on the layer and 60% or less of the solid mass of the layer, and an ink of a support. An ink jet image recording material comprising a back coat layer provided on a surface opposite to a surface provided with an image receiving layer. 2. The inkjet image recording material according to claim 1, wherein the back coat layer contains at least one component selected from a resin latex, an inorganic matting agent and a lubricant. 3. The ink jet image recording material according to claim 1, wherein the ink image receiving layer is a layer having a plurality of porous structures made of inorganic fine particles. 4. The ink jet image recording according to claim 3, wherein the ink image receiving layer has at least two layers having a porous structure containing fine particle silica and / or alumina hydrate and a hydrophilic binder. material. 5. The inkjet image recording material according to claim 1, wherein the lubricant is a silicone-based surfactant or a fluorine-based surfactant. 6. An image recording method for recording an image continuously or intermittently by loading a sheet-shaped image recording material by an inkjet method based on image information representing an image to be recorded on a recording medium, the method comprising: An image recording method, wherein the image recording material is the image recording material according to any one of claims 1 to 5.