JP2007219120A - Electrophotographic image receiving material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrophotographic image receiving material capable of obtaining a photolike, high gloss print which has excellent releasability from a fixing roller and a fixing belt, has reduced curling, and also has excellent flapping resistance, and further having suppressed generation of paper blisters even if being fixed at high temperature. <P>SOLUTION: In the electrophotographic image receiving material, a paper support comprises an electron ray cured resin-coated layer cured by being irradiated with electron rays at least on either face side of a paper substrate, and the surface of the electron ray cured resin-coated layer in the paper support is provided with: a heat insulation layer having a gap; and a toner receiving layer comprising at least one layer of thermoplastic resin on the upper part of the heat insulation layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a novel electrophotographic image receiving material used for electrophotographic image forming equipment such as a copying machine, a printer, and a facsimile machine.

  At present, image forming apparatuses using an electrophotographic method are widely used in offices and the like. Plain paper has been used for this electrophotographic image forming equipment, but for electrophotography that forms high-quality full-color images with the spread and development of multicolor images and full-color image forming methods using electrophotography. Image receiving paper has been developed.

  In recent years, there has been a strong demand for photo-like prints comparable to silver halide photographic prints and inkjet output prints, but color output images by electrophotography still have satisfactory quality compared to prints like the former. The current situation has not yet reached.

  These electrophotographic color prints use toner on the order of several μm as an image forming element. Therefore, the gloss is poor and the amount of toner applied is limited, which is necessary to achieve a photographic image. The current situation is that the density has not been realized, and these improvements are strongly desired for photo-like image output.

  In order to solve the above problems, a method for improving glossiness by providing a thermoplastic resin layer containing a toner melt viscosity reducing agent on a coated paper is disclosed (for example, see Patent Document 1). However, the smoothness of the base paper is inferior, and the high temperature fixing necessary for high melting and glossing of the toner causes deterioration of releasability with the heating roller and heating belt of the fixing unit in contact with the toner fixing surface. However, the present situation is that sufficient gloss cannot be obtained. It has also been found that, due to the influence of heat at the time of fixing, the surface properties of the coated paper become wavy and the curl becomes large after fixing.

  In addition, this method of improving image quality such as gloss by providing an image receiving layer having void particles on a support is disclosed (for example, see Patent Document 2). However, the method described in Patent Document 2 is a method mainly applied to an image forming process in which a special fixing belt is used for cooling and peeling, and a general fixing method such as roller fixing or belt fixing is sufficient. High gloss could not be obtained.

Also disclosed is a method for improving photographic feeling such as glossiness by providing a thermoplastic resin layer on a highly smooth paper support provided with a polyolefin resin coating layer on both sides of the base paper (for example, Patent Documents). 3). According to this method, the wavy after fixing is improved by using a paper substrate having high water resistance, but it is still insufficient for curling improvement, and it does not reach photo-like gloss, and a sufficient photograph can be obtained. There is no sense of feeling, or after fixing, moisture in the base paper is vaporized by high-temperature fixing heat to swell the paper, so-called paper blister generation and gloss deterioration due to releasability from the fixing part are also seen, The current situation still has many issues.
JP 2004-198965 A JP 2003-322993 A JP 2000-66466 A

  The present invention has been made in view of the above problems, and its purpose is high gloss like a photo in an electrophotographic process, excellent releasability from a fixing roller and a fixing belt, small curl, and undulation resistance. An object of the present invention is to provide an electrophotographic image-receiving material capable of obtaining excellent prints and suppressing the generation of paper blisters even when fixed at a high temperature.

  The above object of the present invention is achieved by the following configurations.

  1. The paper support has an electron beam curable resin coating layer cured by irradiating an electron beam on at least one surface side of the paper substrate, and has a void on the electron beam curable resin coating layer of the paper support. An electrophotographic image receiving material comprising a heat insulating layer and a toner receiving layer containing at least one thermoplastic resin on the heat insulating layer.

  2. 2. The electrophotographic image-receiving material as described in 1 above, wherein the electron beam curable resin coating layer contains a white pigment.

  3. 3. The electrophotographic image-receiving material as described in 1 or 2 above, wherein a surface of the paper support opposite to the surface having the electron beam curable resin coating layer has a resin coating layer.

  4). 4. The electrophotographic image-receiving material as described in 3 above, wherein the resin coating layer contains at least a thermoplastic resin or an electron beam curable resin.

  5. 5. The electrophotographic image-receiving material as described in any one of 1 to 4, wherein the toner-receiving layer contains a wax.

  6). 6. The electrophotographic image-receiving material according to any one of 1 to 5, wherein the heat-insulating layer having voids contains hollow particles and a hydrophilic binder.

  7). 7. The electrophotographic image-receiving material as described in 6 above, wherein the hydrophilic binder is a binder that reversibly sol-gel converts.

  8). 8. The electrophotographic image-receiving material as described in 7 above, wherein the binder that reversibly sol-gel converts is a gelatin binder.

  According to the present invention, a photo-like high gloss in an electrophotographic process, excellent releasability from a fixing roller and a fixing belt, a curl is small, and a print having excellent rip-off resistance can be obtained. An electrophotographic image-receiving material in which the generation of paper blisters is suppressed can be provided.

  Hereinafter, the best mode for carrying out the present invention will be described in detail.

  As a result of intensive studies in view of the above problems, the inventor has an electron beam curable resin coating layer cured by irradiating an electron beam on at least one surface side of the paper substrate, An electrophotographic image-receiving material comprising a heat insulating layer having voids on an electron beam curable resin coating layer of a paper support, and a toner receiving layer containing at least one thermoplastic resin on the heat insulating layer. Makes it possible to obtain prints with high gloss that are photo-like in the electrophotographic process, excellent releasability from the fixing roller and fixing belt, small curl, and excellent resistance to rippling, and even when fixed at high temperatures. As a result, it has been found that an electrophotographic image-receiving material in which the occurrence of the above is suppressed can be realized.

  That is, in the above-mentioned configuration defined in the present invention, a heat insulating layer having voids is provided on a paper support having a resin coating layer that is cured by radiation, and a toner receiving layer having high toner compatibility is provided at the top, The heat insulation effect of the heat insulation layer and the radiation resin coating layer, and the heat storage effect, can increase the melting efficiency of the toner and express high gloss, and can greatly improve the paper blister, and the radiation resin coating layer has appropriate air permeability and moisture permeability It was found that the wavy and curl after fixing due to fixing heat damage can be improved.

  The details of the electrophotographic image receiving material of the present invention will be described below.

<Paper support>
The paper support according to the present invention is a resin-coated paper having an electron beam curable resin coating layer cured by irradiating an electron beam on at least one surface of a sheet-like paper substrate (hereinafter also referred to as a base paper). It is.

  The base paper used for the paper support according to the present invention may be a synthetic pulp or synthetic fiber, or a mixture thereof, in addition to an ordinary natural pulp as a component. Of these, natural pulp paper mainly composed of wood pulp of softwood pulp, hardwood pulp, and softwood hardwood mixed pulp is preferably used. The base paper according to the present invention can contain various polymer compounds and additives. For example, a dry low strength agent, a sizing agent, a pigment, a wet paper strength enhancer, a fixing agent, and a pH adjuster. Etc. can be appropriately combined and contained.

For the basis weight of the base paper according to the present invention is not particularly limited, the basis weight is preferably from ^{50g / m 2 ~200g / m 2} , also with respect to the density, is not particularly limited, usually 0.90 ˜1.15 g / cm ³ is preferred.

  The electron beam curable resin coating layer according to the present invention can be formed by applying a coating solution of an organic compound that is polymerized and cured by electron beam irradiation onto a base paper, and then curing by applying an electron beam.

  Organic compounds that are polymerized and cured by electron beam irradiation are unsaturated compounds containing two or more C═C bonds in one molecule, such as acrylic and methacrylic oligomers, polyfunctional acrylic and methacrylic monomers, and 1 Unsaturated compounds containing at least one C═C bond in the molecule, such as monofunctional acrylic and methacrylic monomers, and vinyl monomers.

  These unsaturated organic compounds are polymerized by generating radicals by electron beam irradiation, and are cured by forming a cross-linking bond between the molecules and within the molecule by a cross-linking reaction to produce a cured resin.

  As acrylic and methacrylic oligomers, polyurethane acrylic ester or methacrylic ester, polyether alcohol acrylic ester or methacrylic ester, bisphenol A acrylic ester or methacrylic ester, polyester maleic ester or fumarate An acid ester etc. can be mentioned. In addition, as the polyfunctional acrylic monomer and methacrylic monomer, 1,6-hexanediol acrylate, neopentyl diacrylate, diethylene glycol diacrylate, butadiene acrylate, diethylene glycol dimethacrylate, tetraethylene glycol diacrylate, glycerol trimethacrylate, stearyl acrylate, Polyethylene glycol diacrylate, butoxyethyl acrylate, 1,4-butanediol diacrylate, ethylene glycol dimethacrylate, glycidyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxy Propyl acrylate, phenoxy ethyl Acrylate, cyclohexyl acrylate, benzyl acrylate, N, N-dimethylaminoethyl acrylate, N, N-dimethylaminoethyl methacrylate, ethylenoxide modified phenoxylated phosphoric acid acrylate, neopentyl glycol diacrylate, isocyanuric acid diacrylate, isocyanuric acid triacrylate, Examples thereof include trimethylolpropane triacrylate, propylene oxide-modified trimethylolpropane triacrylate, 1,3-bis (N, N-diepoxypropylaminomethyl) cyclohexane, pentaerythritol pentaacrylate, and the like. Examples of the monofunctional acrylic monomer, methacrylic monomer, and vinyl monomer include styrene, N-vinylpyrrolidone, polyoxyethylene phenyl alcohol acrylic acid ester, and 2-ethylhexyl acrylate.

  It is preferable that the coating liquid of the organic compound to be polymerized and cured according to the present invention contains a white pigment uniformly mixed with the electron beam curable organic compound. As the white pigment, titanium dioxide (anatase type and rutile type), barium sulfate, calcium carbonate, aluminum oxide, magnesium oxide, and the like can be used. Moreover, the dispersibility can also be improved by treating the surface of the titanium dioxide particles with a metal oxide such as hydrous alumina.

  The content of the white inorganic pigment in the coating solution is preferably set to 1 to 60% by mass with respect to the total solid mass of the electron beam curable resin coating layer. As a method of dispersing the white inorganic pigment in the electron beam curable unsaturated organic compound, for example, a three roll mill, a two roll mill, a cowless dissolver, a homomixer, a sand grinder, an ultrasonic disperser, or the like is used. Can do.

  As a coating method of a coating solution containing an electron beam curable organic compound, a roller coating method may be used, and a general bar coating method, air doctor coating method, plate coating method, squeeze coating method, air knife method, reverse roll Any of a coating method and a transfer coating method may be used. Moreover, a fountain coater or a slit orifice coater system can also be used.

  There is no particular restriction on the electron beam irradiation apparatus used in the present invention. Generally, an electron beam accelerator for electron beam irradiation is a curtain beam type that is relatively inexpensive and can provide a large output. Used. The acceleration voltage upon electron beam irradiation is preferably 100 to 300 KV, and the absorbed dose is preferably 0.5 to 10 Mrad.

  The thickness of the coating layer is 3 to 100 μm, preferably 5 to 50 μm. If it is out of this range, coating unevenness will occur or a large amount of energy will be required for curing, and curing will be insufficient, which is undesirable in terms of quality.

  If necessary, surface smoothing with a mirror roll or matting with a mat roll such as a silk roll may be performed after coating or curing.

  The electron beam curable resin coating layer according to the present invention is on the side where the toner image receiving layer is provided. Hereinafter, this electron beam curable resin coating layer is referred to as a surface resin coating layer.

  It is preferable to provide a resin coating layer on the back surface opposite to the surface provided with the front surface resin coating layer according to the present invention. Hereinafter, this resin coating layer is referred to as a back surface bark coating layer.

  Although the thickness of a back surface resin coating layer is decided according to the thickness of a surface resin coating layer, as thickness, it is 3-100 micrometers, Preferably it is the range of 5-50 micrometers.

  The back resin coating layer is preferably an electron beam curable resin coating layer or a thermoplastic resin coating layer in the same manner as the front resin coating layer.

  In the case of the thermoplastic resin coating layer, a general-purpose thermoplastic resin can be used as the thermoplastic resin, but a polyethylene resin is preferable.

Polyethylene resin, density 0.910 g / cm ³ or more from the difference in density, 0.930 g / cm ³ less than the low-density polyethylene, density 0.930 g / cm ³ or more, 0.942 g / cm ³ less than the medium density polyethylene, A density of 0.942 g / cm ³ or more is classified as high-density polyethylene, but the polyethylene resin used for the back resin coating layer according to the present invention is preferably a polyethylene resin containing 50% by mass or more of high-density polyethylene.

  This thermoplastic resin is preferably provided by applying a resin composition comprising a thermoplastic resin on a base paper by melt extrusion coating from a slit die into a film. At that time, the melt extrusion temperature is preferably 200 ° C. to 350 ° C. As the slit die, a T-type die, an L-type die, and a wet tail type die are preferable. Also, the base paper and the resin coating layer can be activated by subjecting the base paper before the coating operation to activation treatment such as corona discharge treatment and flame treatment, or by blowing ozone gas on the surface of the heat-melted resin film to activate it. You may improve the adhesiveness of.

  Moreover, various surface treatments and undercoating treatments can be applied to one or both sides of the paper support according to the present invention for the purpose of improving the adhesion with the layer provided thereon. Examples of the surface treatment include a glossy surface, or a fine surface, mat surface, or silk surface surface forming treatment, corona discharge treatment, flame treatment, glow discharge treatment, and plasma treatment described in JP-A-55-26507. An activation process etc. are mentioned. Examples of the undercoating treatment include the method described in JP-A No. 61-84443. These treatments may be performed alone, or may be subjected to an activation treatment after performing the above-described molding treatment or the like, and may further be subjected to a primer treatment after a surface treatment such as an activation treatment, Each of these means can be arbitrarily combined.

  Applying a hydrophilic binder, a semiconductive metal oxide such as alumina sol or tin oxide, and carbon black or other antistatic agent in the paper support, the front or back of the paper support, or a combination thereof. Also good.

《Insulation layer》
The electrophotographic image receiving material of the present invention is characterized by having a heat insulating layer having voids between the support and the toner receiving layer, and is preferably a heat insulating layer having a high porosity (void capacity).

  By providing the heat insulating layer according to the present invention below the toner receiving layer, the thermal energy applied from a fixing roller or the like during fixing is blocked from diffusing, and the toner receiving layer is maintained at a high temperature, thereby providing a toner receiving layer. Glossy prints can be obtained by melting and smoothing the landed toner particles, or by embedding them in the toner-receiving layer, preventing the generation of paper blisters, and fixing heat efficiency It was found that the toner can be melted at a high temperature to promote the bleed-out of the wax in the toner, thereby improving the releasability between the fixing heating part composed of a fixing roller and a fixing belt and the toner.

  The porosity of the heat insulating layer according to the present invention may be 30% or more, but is preferably 40% or more, and particularly preferably 50% or more and 80% or less.

  As a material for forming the heat insulating layer having a high porosity defined in the present invention, a material obtained by dispersing foamed plastic, hollow particles, or porous particles in a resin layer is used.

  Foamable plastic is a hollow plastic filler containing a heat-fusible substance as a shell and containing a low-boiling solvent inside, and foams when heated. Examples of the thermoplastic resin that forms the shell of the plastic filler include polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyacrylic acid ester, polyacrylonitrile, polybutadiene, and copolymers thereof. Examples of the foaming agent contained in the shell include propane, isobutane, neopentane, and petroleum ether. For example, there are Micropearl manufactured by Matsumoto Yushi Co., Ltd. and Expandel manufactured by Kemanode.

  As the hollow particles, there are micro hollow bodies formed of various materials such as glass, ceramics, plastics, and the like. As the glass micro hollow bodies, borosilicate glass microspheres, for example, Microsel M. manufactured by Grapabell, Inc. are used. As the aluminosilicate micro hollow body, there is a premix for low foam injection molding and standard injection molding, for example, Fillite manufactured by Nihon Philite.

  Moreover, when using an organic hollow particle for a heat insulation layer, a thermally expansible hollow particle and a capsule-shaped hollow polymer are mentioned. The heat-expandable hollow particles are hollow particles having a thermoplastic material such as vinylidene chloride-acrylonitrile copolymer as a wall material, and a material containing a heat-expandable gas such as propane, n-butane and isobutane inside the particle. It is. Further, the non-expandable hollow particles are polymers in which a resin such as styrene-acryl is used as a wall material, water is contained inside, and water evaporates during drying to become hollow particles. The hollow particles as described above generally have a particle size of about 0.1 to 100 μm, but the particle size of the hollow particles used in the present invention is preferably 0.2 to 10 μm, more preferably 0.00. 3-5 μm. If it is less than 0.3 μm, a sufficient heat insulating effect as hollow particles cannot be obtained, and if it exceeds 10 μm, the smoothness is significantly lowered.

  The heat insulating layer according to the present invention is preferably formed of non-expandable hollow particles.

  The binder for holding the heat insulating layer is not particularly limited. For example, styrene-butadiene rubber, styrene-methyl methacrylate-butadiene rubber, acrylic resin, acrylic-styrene resin, acrylic-maleic resin, acrylic-vinyl acetate resin. , Emulsion-type synthetic resins such as ethylene-vinyl acetate resin, water-soluble polymers such as polyvinyl alcohol, starch, casein, and gelatin, carboxymethylcellulose, polyethylene oxide, etc., but reversibly sol-gel conversion A binder is preferred.

  Examples of binders that can be reversibly sol-gel converted include gelatin, gellan gum, color geninan, agar, pectin, and the like, with gelatin binders being preferred.

  The thickness of the heat insulating layer according to the present invention is generally 20 μm, preferably 30 μm or more, more preferably 30 μm or more and 60 μm or less.

<Toner-receiving layer>
The toner receiving layer according to the present invention is made of a thermoplastic resin.

  Examples of the thermoplastic resin applicable to the toner receiving layer according to the present invention include the following thermoplastic resins.

(A) Polyolefin resins such as polyethylene resins and polypropylene resins, copolymer resins of olefins such as ethylene and propylene and other vinyl monomers, acrylic resins, etc.
(B) Those having an ester bond For example, terephthalic acid, isophthalic acid, maleic acid, fumaric acid, phthalic acid, adipic acid, sebacic acid, azelaic acid, abietic acid, succinic acid, trimellitic acid, pyromellitic acid, etc. An acid component (these dicarboxylic acid components may be substituted with a sulfonic acid group, a carboxyl group, etc.) and a diether derivative of ethylene glycol, diethylene glycol, propylene glycol, bisphenol A, bisphenol A (for example, ethylene of bisphenol A) Alcohol components such as oxide 2 adducts, bisphenol A propylene oxide 2 adducts, etc.), bisphenol S, 2-ethylcyclohexyldimethanol, neopentyl glycol, cyclohexyldimethanol, glycerin, etc. Polyester resin or polymethacrylic acid resin such as polymethyl methacrylate, polybutyl methacrylate, polymethyl acrylate, polybutyl acrylate, etc. obtained by condensation with a hydroxyl group etc. may be substituted in the alcohol component of Ester resin, polycarbonate resin, polyvinyl acetate resin, styrene acrylate resin, styrene-methacrylic acid ester copolymer resin, vinyl toluene acrylate resin and the like. Specific examples include those described in JP-A Nos. 59-101395, 63-7971, 63-7972, 63-7773, and 60-294862. Commercially available products include Byron 290, Byron 200, Byron 280, Byron 300, Byron 103, Byron GK-140, Byron GK-130, etc. manufactured by Toyobo, Kao's Tufton NE-382, Tufton U-5, ATR- 2009, ATR-2010, etc., Unitika Eritel UE3500, UE3210, XA-8153, etc., Nippon Synthetic Chemical Polyester TP-220, R-188, etc. can be mentioned.

(C) Polyurethane resin, etc.
(D) Polyamide resin, urea resin, etc.
(E) Polysulfone resin, etc.
(F) Polyvinyl chloride resin, polyvinylidene chloride resin, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl propionate copolymer resin, etc.
(G) Polyvinyl butyral, etc., polyol resin, ethyl cellulose resin, cellulose resin such as cellulose acetate resin, etc.
(H) Polycaprolactone resin, styrene-maleic anhydride resin, polyacrylonitrile resin, polyether resin, epoxy resin, phenol resin and the like.

  Each of the above thermoplastic resins may be used alone, or two or more of these thermoplastic resins may be mixed and used.

  The toner receiving layer may be a single layer or may be composed of two or more layers. The thickness of the toner receiving layer is generally from 0.1 to 50 μm, preferably from 0.5 to 20 μm.

  The glass transition point of the thermoplastic resin used in the toner receiving layer according to the present invention is 0 ° C. or higher, preferably 20 ° C. or higher, and the thermal conductivity is preferably 0.3 W / m · K or lower. The thermal conductivity of the thermoplastic resin is, for example, “New edition plastic material reader” (Industry Research Committee, published April 1, 1993, new edition 4 printing), “Plastic molding data book” (Nikkan Kogyo Shimbun, 1988). 1st edition issued in March) and “Plastics Data Book” (Industry Research Committee, issued in December 1999, first edition issued).

  As the thermoplastic resin used in the toner receiving layer according to the present invention, it is preferable to select a resin having high compatibility with the binder resin constituting the toner to be received from the viewpoint that the effects of the present invention can be further exhibited.

  To be compatible with the toner binder resin in the present invention means that the thermoplastic resin A of the toner receiving layer and the toner binder resin do not form a boundary in the image after fixing. As a method for evaluating the compatibility of the toner with the binder resin, for example, a method in which the solubility parameter described in JP-A-2-263642 is used for measurement is described. A method for measuring the toner inclination angle can be mentioned.

  As a method for measuring the melted toner inclination angle, after forming a toner disk, the toner receiving layer composed of the thermoplastic resin A set at a predetermined temperature is brought into close contact with the toner disk, and the toner disk is melted. , Quench, solidify. Using this contact angle measuring device manufactured by Kyowa Interface Chemical Co., Ltd., the angle of the bottom of the toner after the toner is solidified is measured twice, and the average value is taken as the molten toner inclination angle.

  When the thermoplastic resin is selected from the viewpoint of the molten toner inclination angle, it is preferable to use a resin having a toner inclination angle of 40 degrees or less between the toner used for color image formation and the thermoplastic resin. The resin of the transparent resin layer having a molten toner inclination angle of 40 degrees or less includes polyester resin, styrene-acrylic ester resin, epoxy resin, polyurethane resin, polymethyl methacrylate resin, vinyl chloride resin, vinyl chloride-vinyl acetate copolymer. And other thermoplastic resins. Particularly preferred is a resin of the same type as the main resin of the toner (a resin containing 50% by mass or more based on the binder resin). That is, if the main resin of the toner is a polyester resin, a polyester resin is used as the thermoplastic resin of the toner receiving layer. If the main resin of the toner is a styrene-acrylic ester resin, an acrylic resin is used as the thermoplastic resin of the toner receiving layer. It is preferable to use a styrene-acrylic ester resin.

"wax"
The toner receiving layer according to the present invention preferably contains a wax.

  The wax applicable to the present invention is not particularly limited and can be appropriately selected according to the purpose. For example, petroleum wax, modified wax, hydrogenated wax, vegetable wax, animal wax, mineral wax, Examples include synthetic hydrocarbons.

  Examples of petroleum waxes include paraffin wax, microcrystalline wax, petrolatum, Fischer-Tropsch wax, acid amide compounds, and acid imide compounds.

  Examples of the modified wax include amine-modified polypropylene, acrylic acid-modified, fluorine-modified, olefin-modified wax, urethane type wax, alcohol type wax and the like.

  Examples of hydrogenated wax include hardened castor oil, castor oil derivatives, stearic acid, lauric acid, myristic acid, palmitic acid, behenic acid, sebacic acid, undecylenic acid, maleic acid, highly maleated oil, blowing oil, cyclopentadieneization Examples include synthetic waxes such as oil.

  Examples of plant waxes include carnauba wax, castor oil, rapeseed oil, soybean oil, wood wax, cotton wax, rice wax, sugarcane wax, candelilla wax, Japan wax, jojoba oil and the like.

  Examples of animal waxes include beeswax, lanolin, spermaceti, stew wax (whale oil), and wool wax.

  Examples of the mineral wax include natural waxes such as ozokerite and ceresin, and fatty acid esters such as montanic acid ester wax.

  Examples of the synthetic hydrocarbon include acid amide compounds or acid imide compounds such as polyethylene wax, polypropylene wax, and Fischer-Tropsch wax.

  Among the waxes listed above, carnauba wax, fatty acid ester wax, paraffin wax, acid amide compound and the like are preferable.

  The amount of the wax used in the present invention depends on the type of the wax, but is suitably 1 to 20% by mass, preferably 2 to 15% by mass with respect to the mass of the toner receiving layer. .

  The method for adding the wax to the toner receiving layer is not particularly limited, and there are a method of adding a liquid obtained by heating and melting the wax, a method of adding an aqueous dispersion emulsion in which the wax is finely dispersed, and the like.

<Other additives for toner receiving layer and heat insulating layer>
In addition to the above-described additives, various additives can be used for the toner image-receiving layer or the heat-insulating layer according to the present invention for the purpose of improving the thermodynamic characteristics.

  Such additives can be appropriately selected according to the purpose, for example, plasticizers, fillers, crosslinking agents, charge control agents, conductive agents, pigments, surfactants, dyes, humidity control agents, Matting agents and the like can be mentioned.

  The plasticizer has a function of adjusting the flow or softening of the toner receiving layer by heat or pressure when fixing the toner. Plasticizers include "Chemical Handbook" (edited by the Chemical Society of Japan, Maruzen), "Plasticizers-Theory and Applications-" (written by Koichi Murai, Koshobo), "Research on plasticizers" It can be selected with reference to "Research" (edited by Polymer Chemistry Association) and "Handbook Rubber / Plastic Compounded Chemicals" (edited by Rubber Digest).

  Moreover, as a filler, a well-known thing can be used as a reinforcing agent for resin, a filler, and a reinforcing material, An organic and inorganic filler are preferable. The filler can be selected with reference to "Handbook Rubber / Plastic Compounding Chemicals" (edited by Rubber Digest Co., Ltd.), "New Edition Plastic Compounding Agent Basics and Applications" (Taiseisha), "Filler Handbook" (Taiseisha), etc. it can.

  Examples of the crosslinking agent include an epoxy group, an isocyanate group, an aldehyde group, an active halogen group, an active methylene group, an acetylene group, and other compounds having two or more known reactive groups in the molecule as a reactive group. Further, a compound having two or more groups capable of forming a bond by ionic bond, coordinate bond, or the like is also included. Examples of the crosslinking agent also include known compounds such as coupling agents for resins, curing agents, polymerization agents, polymerization accelerators, coagulants, film-forming agents, film-forming aids, and the like.

  The charge adjusting agent can be used for the purpose of adjusting toner transfer, adhesion, etc., and preventing charging adhesion of electrophotographic receiving paper. As the charge control agent, any of conventionally known antistatic agents and charge control agents can be used. Surfactants such as cationic surfactants, anionic surfactants, amphoteric surfactants and nonionic surfactants In addition, a polymer electrolyte, a conductive metal oxide, and the like can be used.

Examples of the conductive agent include metal oxides such as ZnO, TiO ₂ , SnO ₂ , Al ₂ O ₃ , In ₂ O ₃ , SiO ₂ , MgO, BaO, and MoO ₃ . These may be used individually by 1 type and may use 2 or more types together.

  Examples of the pigment include fluorescent whitening agents, white pigments, colored pigments, and dyes for the purpose of improving image quality, particularly whiteness. The fluorescent whitening agent is a compound that has absorption in the near ultraviolet region and emits fluorescence at 400 to 500 nm. Examples of the fluorescent brightener include stilbene compounds, coumarin compounds, biphenyl compounds, benzoxazoline compounds, naphthalimide compounds, pyrazoline compounds, carbostyril compounds, and the like.

  Various known dyes can be used as the dye, and examples thereof include oil-soluble dyes. Examples of oil-soluble dyes include anthraquinone compounds and azo compounds.

The whiteness of the toner-receiving layer according to the present invention is not particularly limited and can be appropriately selected according to the purpose, but is preferably higher. As the whiteness, in the CIE 1976 (L ^* a ^* b ^* ) color space, the L ^* value is preferably 80 or more, more preferably 85 or more, and particularly preferably 90 or more. The white color is preferably as neutral as possible. As a white color, in the L ^* a ^* b ^* space, the value of (a ^* ) ² + (b ^* ) ² is preferably 50 or less, more preferably 18 or less, and particularly preferably 5 or less.

  The smoothness of the toner receiving layer according to the present invention is not particularly limited and can be appropriately selected according to the purpose, but is preferably higher. Further, the smoothness is not particularly limited and can be appropriately selected according to the purpose, but is preferably higher. As the smoothness, the arithmetic average roughness (Ra) is preferably 3 μm or less, more preferably 1 μm or less, and more preferably 0.5 μm or less in the entire region from white without toner to black having the maximum density. It is particularly preferred. The arithmetic average roughness can be measured based on JIS B 0601, JIS B 0651, and JIS B 0652.

The surface electrical resistance of the toner receiving layer according to the present invention is preferably 1 × 10 ⁶ to 1 × 10 ¹⁵ Ω (25 ° C., 65% RH), and other than the toner receiving layer according to the present invention. The surface electrical resistance in the layer is also preferably 1 × 10 ⁶ to 1 × 10 ¹⁵ Ω (25 ° C., 65% RH condition).

  A matting agent can be added to the toner receiving layer according to the present invention. There is no restriction | limiting in particular as a mat agent, According to the objective, it can select suitably, For example, a solid particle etc. are mentioned. The solid particles can be classified into inorganic particles and organic particles.

《Other constituent layers》
In the electrophotographic image receiving material of the present invention, in addition to the toner receiving layer and the heat insulating layer described above, other constituent layers can be provided. The other constituent layers are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a surface protective layer, an intermediate layer, an undercoat layer, a cushion layer, a charge control (prevention) layer, a reflective layer, and a color. Examples include a taste preparation layer, a storage stability improving layer, an adhesion preventing layer, an anti-curl layer, and a smoothing layer. These may have a single layer structure or a laminated structure. When the support is a reflective support and is a reflective electrophotographic image receiving material in which the toner receiving layer according to the present invention is provided on the support, each layer provided on the support needs to be transparent. Rather, it is preferably white.

  As the opacity of the electrophotographic image-receiving material of the present invention, the value measured by the method defined in JIS P 8138 is preferably 85% or more, more preferably 90% or more.

  In the electrophotographic image-receiving material of the present invention, for the purpose of imparting backside output suitability, improving backside output image quality, improving curl balance, imparting writing properties, inkjet, other print suitability, improving device passability, etc. A back layer can be provided on the side opposite to the side on which the image receiving layer is provided. The back layer may have the same configuration as the image receiving layer side in order to improve the double-sided output suitability. In the back layer, the above-mentioned various additives can be used, and it is particularly preferable to use the above-mentioned matting agent, slip agent, charge adjusting agent and the like. The back layer may be a single layer or two or more layers. In addition, when releasing oil is used for a fixing roller or the like to prevent offset at the time of fixing, it is preferable that the back surface has oil absorbability.

  In the electrophotographic image-receiving material of the present invention, an adhesion improving layer can be provided for the purpose of improving the adhesion between the support, the heat insulating layer, the toner receiving layer, and other constituent layers.

  In the electrophotographic image-receiving material of the present invention, various additives can be used for the purpose of improving the stability of the output image and improving the stability of the image-receiving layer itself. Examples of such additives include various known antioxidants, anti-aging agents, ultraviolet absorbers, light stabilizers, deterioration inhibitors, ozone deterioration inhibitors, preservatives, and antifungal agents.

  The electrophotographic image-receiving material of the present invention can be used for image formation with an electrophotographic toner by an electrophotographic method, and can be suitably used for color image formation with an electrophotographic color toner.

<Electrophotographic toner>
The toner used in the present invention is not particularly limited as long as it is a known electrophotographic toner, and the toner production method is not particularly limited as long as it is a known production method such as a pulverization method or a polymerization method. In order to produce the effect of the above, a monomer is emulsion-polymerized in a suspension polymerization method or a liquid obtained by adding an emulsion of necessary additives to produce fine polymer particles, and then an organic solvent, A production method in which an aggregating agent or the like is added to associate is preferable. At the time of association, a method of preparing by mixing with a dispersion liquid such as a release agent or a colorant necessary for the composition of the toner and making it associate, or a toner component such as a release agent or a colorant in the monomer A method of emulsion polymerization after dispersion is preferred. The association here means that a plurality of resin particles and colorant particles are fused.

  Although it does not specifically limit as a manufacturing method of a suspension polymerization method, The following manufacturing methods can be mentioned.

  That is, various constituent materials such as a colorant and, if necessary, a release agent, a charge control agent, and a polymerization initiator are added to the polymerizable monomer, and then a homogenizer, a sand mill, a sand grinder, an ultrasonic disperser, etc. Various constituent materials are dissolved or dispersed in the polymerizable monomer. The polymerizable monomer in which these various constituent materials are dissolved or dispersed is dispersed in oil droplets having a desired size as a toner in an aqueous medium containing a dispersion stabilizer using a homomixer or a homogenizer. Thereafter, the stirring mechanism is transferred to the reaction apparatus which is the aforementioned stirring blade, and the polymerization reaction is advanced by heating. After completion of the reaction, the dispersion stabilizer is removed, filtered, washed, and further dried to prepare a toner applicable to the present invention.

  Further, in the present invention, as a method for producing toner, a method in which resin particles are prepared by fusing in an aqueous medium can also be mentioned. The method is not particularly limited, and examples thereof include methods described in JP-A-5-265252, JP-A-6-329947, and JP-A-9-15904. That is, a method of associating a plurality of fine particles composed of resin particles and coloring agents, or dispersed particles of constituent materials such as resin particles and coloring agents, in particular, after dispersing them in water using an emulsifier, the critical aggregation concentration Applicable to the present invention by adding the above flocculant and salting out, and at the same time, heat-melting at or above the glass transition temperature of the formed polymer, and heat-drying the particles in a fluid state while containing water. Can be formed. Here, an organic solvent that is infinitely soluble in water may be added simultaneously with the flocculant.

  As the resin component of the toner, a known resin can be used, but generally, a polyester resin, a styrene-acrylic resin, or the like can be mainly used. When an image is formed on the coating layer, it is preferable to select a resin having high compatibility with a resin component such as an adhesive contained in the coating layer as the resin component of the toner. From this point of view, as the resin component of the toner, one or a mixture of two or more of polyester resin, styrene-acrylic ester resin, styrene-methacrylic ester resin, etc. may be used depending on the purpose. Is preferred.

  The volume average particle diameter of the toner is preferably in the range of 2 to 10 μm, and more preferably in the range of 3 to 9 μm. When the volume average particle diameter of the toner is less than 2 μm, the chargeability tends to be insufficient and the developability may be deteriorated. On the other hand, when it exceeds 10 μm, the resolution of the image may be deteriorated. Therefore, it is not preferable respectively.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto. In addition, although the display of "part" or "%" is used in an Example, unless otherwise indicated, "part by mass" or "mass%" is represented.

Example 1
<Production of support>
[Preparation of Support A]
Sulfate method bleached hardwood pulp (LBKP) 90% by weight, sulfate method bleached softwood pulp (NBSP) 10% by weight, with respect to the pulp, 0.7% cationic starch, 0.07% alkenyl succinic anhydride, A raw material prepared by adding 20% heavy calcium carbonate and 1% band is made with a long net paper machine, and an aqueous solution containing polyacrylamide and alkyl ketene dimer as a surface sizing agent is dried on both sides in a size press. treated so as to be 0.9 g / m ² to give a white base paper a after drying basis weight 170 g / m ^2.

Separately, 0.1% by mass of sodium polyacrylate was added to a blend of 70% kaolin and 30% light calcium carbonate, and a 65% pigment slurry was prepared with a courseless disperser. To this slurry, 10% casein and 10% styrene-butadiene copolymer latex were added, and water was further added to prepare a coating solution having a solid concentration of 50%. The coating liquid is applied to the surface side of the white base paper a with a reverse roll coater so that the dry mass becomes 20 g / m ^2, and then pressed and dried with a cast dryer at 100 ° C. A was produced.

[Preparation of Support B]
A white base paper b having a basis weight of 160 g / m ² composed of 50% by mass sulfate-method bleached hardwood pulp (LBKP) and 50% sulfate-method bleached softwood pulp (NBSP) was prepared.

On the back surface of the white base paper b, polyethylene having a density of 0.935 g / cm ³ was melt-extruded at 300 ° C. as a back resin layer to coat a 25 g / m ² back resin layer.

Next, as a surface resin layer on the surface side, 92% of polyethylene having a density of 0.920 g / cm ³ and 8% of rutile type titanium oxide were kneaded, and then a surface resin of 25 g / m ² by melt extrusion coating at 300 ° C. A support B having a resin coating layer on both sides was prepared.

[Preparation of Support C]
On the back surface of the white base paper b, polyethylene having a density of 0.952 g / cm ³ was melt-extruded at 300 ° C. as a back resin layer to coat a 20 g / m ² back resin layer.

  Next, an electron beam curable organic compound-white pigment composition having the following composition was prepared.

Epoxy acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd .: NK Ester EA800) 30%
Polybutadiene (Nippon Soda Co., Ltd .: TEA-1000) 20%
Triethylene glycol diacrylate 30%
Rutile type titanium oxide 20%
The mixture of the above components was dispersed with a ball mill for 20 hours.

Next, the obtained dispersion was applied to the surface of the white base paper b so that the coating amount after curing was 25 g / m ² . Next, an electron beam was irradiated from the back surface under the conditions of an acceleration voltage of 175 KV and an absorbed dose of 2 Mrad, and the resin was cured to form a surface resin coating layer.

[Preparation of Support D]
On the back surface of the white base paper b, polyethylene having a density of 952 g / cm ³ was melt-extruded at 300 ° C. as a back resin layer to coat a 20 g / m ² back resin layer.

  Next, an electron beam curable organic compound-white pigment composition having the following composition was prepared.

Urethane acrylate oligomer (compound described in US Pat. No. 4,092,173) 25%
Diethylene glycol diacrylate 25%
Anatase type titanium oxide 50%
The mixture of the above components was dispersed with a ball mill for 20 hours.

Next, the obtained dispersion was applied to the surface of the white base paper b so that the coating amount after curing was 25 g / m ² . Next, an electron beam was irradiated from the back surface under the conditions of an acceleration voltage of 175 KV and an absorbed dose of 2 Mrad, and the resin was cured to form a surface resin coating layer.

[Preparation of Support E]
On the back surface of the white base paper b, polyethylene having a density of 0.952 g / cm ³ was melt-extruded at 300 ° C. as a back resin layer to coat a 20 g / m ² back resin layer.

  Next, an electron beam curable organic compound-white pigment composition having the following composition was prepared.

35% polyester acrylate
Hexanediol diacrylate 35%
Trimethylolpropane triacrylate 25%
Rutile type titanium oxide 5%
The mixture of the above components was dispersed with a ball mill for 20 hours.

Next, the obtained dispersion was applied to the surface of the sheet-like substrate so that the coating amount after curing was 25 g / m ² . Next, an electron beam was irradiated from the back surface under the conditions of an acceleration voltage of 175 KV and an absorbed dose of 2 Mrad, and the resin was cured to form a surface resin coating layer.

[Preparation of Support F]
An electron beam curable organic compound-white pigment composition having the following composition was prepared.

Urethane acrylate oligomer 50%
Acrylate monomer 50%
The mixture of the above components was mixed with a ball mill.

Next, the obtained composition was applied to the back surface of the white base paper b so that the coating amount after curing was 15 g / m ² . Next, irradiation was performed from the back surface under conditions of an acceleration voltage of 175 KV and an absorbed dose of 1 Mrad, the resin was cured, and a back surface resin coating layer was formed.

Next, after applying the composition to the surface of the white base paper b so that the coating amount after curing is 15 g / m ² , the resin is irradiated from the back surface under the conditions of an acceleration voltage of 175 KV and an absorbed dose of 2 Mrad. A surface resin coating layer was formed by curing.

[Preparation of Support G]
On the back surface of the white base paper b, polyethylene having a density of 0.931 g / cm ³ was melt-extruded at 300 ° C. as a back resin layer to coat a back resin layer of 20 g / m ² .

  Next, an electron beam curable organic compound-white pigment composition having the following composition was prepared.

Dipentaerythritol hexaacrylate 85%
Anatase type titanium oxide 15%
The mixture of the above components was dispersed with a ball mill for 20 hours.

Next, the obtained composition was applied to the surface of the sheet-like substrate so that the coating amount after curing was 20 g / m ² . Next, an electron beam was irradiated from the back surface under the conditions of an acceleration voltage of 175 KV and an absorbed dose of 2 Mrad, and the resin was cured to form a surface resin coating layer.

<Production of electrophotographic image receiving material>
[Preparation of Sample 101]
The surface side of the paper support A having the coating layer is subjected to a corona discharge treatment according to a conventional method, and then the toner receiving layer a coating liquid described below is used as a toner receiving layer a made of a thermoplastic resin using a wire bar. The sample 101 was prepared by coating and drying so that the film thickness after drying was 15 μm.

(Toner-receiving layer a coating solution)
Polyester aqueous dispersion (Toyobo Vylonal MD-1100, solid content concentration 30%)
50%
Dioctyl sodium sulfosuccinate aqueous solution (solid content 1%) 10%
Polyethylene oxide (Malsei Chemical Alcox E30) 1%
Water 39%
[Production of Sample 102]
After subjecting the surface resin layer side of the paper support B to corona discharge treatment according to a conventional method, an anchor layer a made of gelatin is provided with a dry film thickness of 0.1 μm, and then the toner is formed on the surface in the same manner as the sample 101. Toner receiving layer a was formed using the receiving layer a coating solution, and sample 102 was produced.

[Production of Sample 103]
After the corona discharge treatment is applied to the surface side of the paper support A having the coating layer according to a conventional method, the average film thickness after drying is 30 μm using the heat insulating layer a coating liquid comprising the following hollow particles. The sample 102 was prepared by coating and drying with a wire bar.

(Insulation layer a coating solution)
Hollow particle dispersion (manufactured by Nippon Zeon MH8101, solid concentration 26.5%) 40%
Alkali-treated gelatin 3%
2,4-Dichloro-6-hydroxy-S-triazine / sodium aqueous solution (solid content concentration 4%) 2%
Dioctyl sodium sulfosuccinate aqueous solution (solid content 1%) 10%
Water 45%
The porosity of the heat insulating layer a was 63%.

[Production of Sample 104]
After corona discharge treatment is performed on the surface resin layer side of the paper support C according to a conventional method, an anchor layer a made of gelatin is provided with a dry film thickness of 0.1 μm, and then the heat insulating layer a coating solution is formed thereon. After coating and drying with a wire bar so that the average film thickness after drying is 30 μm, the toner receiving layer b coating solution comprising the following acrylic resin is applied to the wire bar so that the average film thickness after drying is 5 μm. The sample 104 was prepared by coating and drying.

(Toner-receiving layer b coating solution)
Acrylic resin aqueous solution (manufactured by Nichigo Movinyl Co., Ltd., Movinyl 743, solid concentration 43%)
Alkali-treated gelatin 2%
2,4-Dichloro-6-hydroxy-S-triazine / sodium aqueous solution (solid content 4%) 1%
Dioctyl sodium sulfosuccinate aqueous solution (solid content 1%) 15%
Water 42%
[Preparation of Sample 105]
After corona discharge treatment is performed on the surface resin layer side of the paper support C according to a conventional method, an anchor layer a made of gelatin is provided with a dry film thickness of 0.1 μm, and then the heat insulating layer a coating solution is formed thereon. After coating and drying with a wire bar so that the average film thickness after drying is 30 μm, the average film thickness after drying is 5 μm using the toner receiving layer c coating solution made of the following acrylic resin. Thus, the sample 105 was produced by applying and drying with a wire bar.

(Toner-receiving layer c coating solution)
Acrylic resin aqueous solution (manufactured by Nichigo Movinyl Co., Ltd., Movinyl 743, solid concentration 43%)
Alkali-treated gelatin 2%
2,4-Dichloro-6-hydroxy-S-triazine / sodium aqueous solution (solid content 4%) 1%
Dioctyl sodium sulfosuccinate aqueous solution (solid content 1%) 15%
Carnauba wax emulsion aqueous solution (manufactured by Chukyo Yushi Co., Cellosol 524, active ingredient concentration 30%)
Water 32%
[Production of Samples 106 to 109]
Sample 106 to sample 109 were prepared in the same manner as in the preparation of the sample 105 except that each paper support shown in Table 1 was used instead of the paper support C.

[Preparation of Sample 110]
After performing corona discharge treatment on the surface resin layer side of the paper support C according to a conventional method, an anchor layer a made of gelatin is provided with a dry film thickness of 0.1 μm, and a heat insulating layer made of the following hollow particles is formed thereon. After coating and drying with a wire bar so that the average film thickness after drying is 30 μm using b coating liquid, the average film thickness after drying is using the toner receiving layer c coating liquid made of the acrylic resin. Was applied with a wire bar so as to be 5 μm and dried to prepare a sample 110.

(Insulation layer b coating solution)
Hollow particle dispersion (MH, Zeon, MH5055, solid content: 30%) 40%
Polyvinyl alcohol (average polymerization degree 3500) 3%
Boric acid / borax = 1/1 (1% solution) 1%
Dioctyl sodium sulfosuccinate aqueous solution (solid content 1%) 10%
Water 46%
In addition, the porosity of the heat insulation layer b was 50%.

[Production of Sample 111]
After performing corona discharge treatment on the surface resin layer side of the paper support C according to a conventional method, an anchor layer a made of gelatin is provided with a dry film thickness of 0.1 μm, and a heat insulating layer made of the following hollow particles is formed thereon. c After coating and drying with a wire bar so that the average film thickness after drying is 30 μm, using the toner receiving layer c coating liquid made of the acrylic resin, the average film thickness after drying is A sample 111 was prepared by applying and drying with a wire bar so as to be 5 μm.

(Insulation layer c coating solution)
Spherical porous silica particles (Psylosia 1501 manufactured by Fuji Silysia Chemical) 20%
Alkali-treated gelatin 5%
2,4-Dichloro-6-hydroxy-S-triazine / sodium aqueous solution (solid content 4%) 1%
Dioctyl sodium sulfosuccinate aqueous solution (solid content 1%) 5%
69% water
In addition, the porosity of the heat insulation layer c was 62%.

[Preparation of Sample 112]
After the corona discharge treatment is performed on the surface resin layer side of the paper support C according to a conventional method, an anchor layer a made of gelatin is provided with a dry film thickness of 0.1 μm, and the heat insulating layer a coating solution is used thereon. Then, after coating and drying with a wire bar so that the average film thickness after drying becomes 30 μm, the average film thickness after drying is 5 μm using the toner receiving layer d coating solution made of styrene / acrylic resin as described below. A sample 112 was prepared by applying and drying with a wire bar.

(Toner-receiving layer d coating solution)
Styrene / acrylic resin aqueous solution (manufactured by Nichigo Movinyl, Movinyl 752, solid concentration 47%) 40%
Alkali-treated gelatin 2%
2,4-Dichloro-6-hydroxy-S-triazine / sodium aqueous solution (solid content 4%) 1%
Dioctyl sodium sulfosuccinate aqueous solution (solid content 1%) 15%
Stearic acid amide emulsion aqueous solution (High-micron L-271 manufactured by Chukyo Yushi Co., Ltd., active ingredient concentration 25%) 12%
30% water
<Evaluation of electrophotographic image-receiving material>
The samples 101 to 112, which are the electrophotographic image receiving materials prepared above, were evaluated as follows using a printer magiccolor 2430DL manufactured by Konica Minolta Business Technologies, Inc. modified so that the conveyance speed and the temperature of the fixing device could be changed. As the toner, a toner for magiccolor 2430DL was used.

[Glossiness measurement]
A magenta solid image was output under the fixing conditions of the modified magiccolor 2430DL under the conditions of a fixing temperature of a heating roller of 200 ° C. and a fixing speed of 50 mm / sec. -5D), the 20-degree glossiness was measured, and the glossiness was determined.

[Evaluation of paper blister resistance]
The fixing conditions of the modified magiccolor 2430DL under the environmental conditions of 23 ° C. and 55% RH are as follows: the fixing temperature of the heating roller is 200 ° C., the fixing speed is 30 mm / sec, and each electrophotographic image-receiving material is not transferred with toner. The size of the paper blister was visually observed through 100 postcard sizes, and the paper blister resistance was evaluated according to the following criteria.

A: Blister generation is not observed B: Blister generation is observed on 1 to 2 sheets C: Blister generation is observed on 3 to 10 sheets D: Blister generation is observed on 11 sheets or more In the above rank , A can be judged as a high-performance electrophotographic image-receiving material. In the case of C and D, it cannot be used as an electrophotographic image receiving material.

[Evaluation of wave resistance]
Under the environmental conditions of 28 ° C. and 80% RH, the fixing condition of the modified magiccolor 2430DL is one-sided printing at a fixing temperature of the heating roller of 180 ° C. and a fixing speed of 30 mm / sec. The state was visually observed, and the waving resistance was evaluated according to the following criteria.

A: Generation of undulations is not observed at all. B: Extremely weak undulations are observed, but the quality is good. C: Generation of weak undulations is observed, but the quality is acceptable in practice. D: Generation of strong undulations. Is recognized and is a quality that is problematic in practice. E: Significant waviness is generated and the quality is not practical. In the above evaluation rank, D and E cannot be used as high-performance electrophotographic image receiving materials.

[Evaluation of curl resistance]
Under the environmental conditions of 23 ° C and 20% RH, the modified magiccolor 2430DL was fixed on the heating roller at a fixing temperature of 200 ° C and the fixing speed was set at a linear speed of 30 mm / sec. The curl resistance was evaluated according to the following criteria by visual observation.

A: No curling is observed. B: Slight curling is observed, but the curl characteristics are almost excellent. C: Curling is clearly observed, and the quality is a problem in practical use. D: Extremely Strong curl is generated, and in some cases, it is cylindrical. In the above evaluation rank, C and D cannot be used as high-performance electrophotographic image receiving materials.

  The results obtained as described above are shown in Table 1.

  As is apparent from the results shown in Table 1, the electrophotographic image-receiving material of the present invention has a high glossiness as compared with the comparative example, a small printed curl after fixing, and an excellent resistance to undulation. Further, it can be seen that the paper blister resistance is excellent even at high temperature fixing.

Claims (8)

The paper support has an electron beam curable resin coating layer cured by irradiating an electron beam on at least one surface side of the paper substrate, and has a void on the electron beam curable resin coating layer of the paper support. An electrophotographic image receiving material comprising a heat insulating layer and a toner receiving layer containing at least one thermoplastic resin on the heat insulating layer. The electrophotographic image-receiving material according to claim 1, wherein the electron beam curable resin coating layer contains a white pigment. The electrophotographic image-receiving material according to claim 1 or 2, wherein a surface of the paper support opposite to the surface having the electron beam curable resin coating layer has a resin coating layer. The electrophotographic image-receiving material according to claim 3, wherein the resin coating layer contains at least a thermoplastic resin or an electron beam curable resin. The electrophotographic image receiving material according to claim 1, wherein the toner receiving layer contains a wax. The electrophotographic image-receiving material according to claim 1, wherein the heat insulating layer having voids contains hollow particles and a hydrophilic binder. The electrophotographic image-receiving material according to claim 6, wherein the hydrophilic binder is a binder that reversibly sol-gel converts. The electrophotographic image-receiving material according to claim 7, wherein the binder that reversibly converts to sol-gel is a gelatin binder.