JP2007279345A - Electrophotographic image receiving material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrophotographic image receiving material having satisfactory photograph-like gloss and mapping properties in a single fixation and having high abrasion resistance capable of preventing the generation of scratches, abrasions or the like. <P>SOLUTION: The electrophotographic image receiving material having a toner receiving layer on the surface of a reflective support includes an adiabatic layer having a gap composed of at least one layer between the reflective support and the toner receiving layer, and the toner receiving layer contains inorganic particulates of which the average particle size is 1-200 nm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrophotographic image receiving material used for an apparatus using an electrophotographic process such as a copying machine, a printer, a facsimile machine and the like.

  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 growing demand for photo-like prints comparable to silver halide photographic prints and inkjet output prints, but color output images by electrophotography are still satisfactory in quality compared to the former prints. The situation is not so far.

  Since these electrophotographic color prints use toner on the order of several μm as an image forming element, the toner swells, resulting in surface irregularities and unevenness between the image area and the non-image area. The salt photo print and the photo-like ink jet output print have problems such as a lack of gloss and a great sense of incongruity of the toner step, and these improvements are strongly desired.

  In order to solve the above-mentioned problem, there has been disclosed a method of expressing gloss by performing fixing by a belt fixing method after fixing (see Patent Documents 1 and 2). However, when such fixing process is performed twice or more, the device design becomes complicated as the number of processes increases, and there are problems such as poor versatility. There is a demand for a printing technique that can provide a photo-like image with a feeling.

As a method for producing gloss, a method of incorporating high void particles in an image receiving layer is disclosed (see Patent Document 3). However, the gloss is still inadequate. If the ratio of void particles is increased to further increase the gloss, or if the thickness of the void layer is increased, the image clarity due to light scattering due to the shape of the void particles ( As a result of the deterioration of the specularity or the film strength of the void particle layer, scratches and scratches occur during printing and handling after printing, resulting in deterioration of the abrasion resistance.
JP 2000-66466 A JP 2005-4038 A JP 2003-322993 A

  The present invention has been made in view of the above problems, and its purpose is to have photo-like gloss and image clarity that can be satisfied by a single fixing, and also to scratch resistance that does not cause scratches or scratches. The object is to provide an excellent electrophotographic image-receiving material.

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

  1. In an electrophotographic image-receiving material having a toner receiving layer on a reflective support, the electrophotographic image-receiving material has a heat insulating layer having at least one void between the reflective support and the toner receiving layer, and the toner receiving layer has an average An electrophotographic image-receiving material comprising inorganic fine particles having a particle size of 1 to 200 nm.

  2. 2. The electrophotographic image receiving material according to 1, wherein the toner receiving layer contains inorganic fine particles having an average particle diameter of 1 to 200 nm and a thermoplastic resin.

  3. 3. The electrophotographic image receiving material according to 2, wherein the inorganic fine particles having an average particle diameter of 1 to 200 nm and a thermoplastic resin are an integrated colloidal silica composite resin.

  4). The electrophotographic image-receiving material according to any one of 1 to 3, wherein the heat insulating layer contains hollow particles.

  5. The electrophotographic image-receiving material according to any one of 1 to 4, wherein the heat insulating layer has a thickness of 15 to 150 µm.

  According to the present invention, it is possible to provide an electrophotographic image-receiving material that has photo-like gloss and image clarity that can be satisfied by a single fixing, and that has excellent scratch resistance without causing scratches or scratches. .

  As a result of intensive studies in view of the above problems, the present inventor has found that in an electrophotographic image-receiving material having a toner-receiving layer on a reflective support, at least one gap is formed between the reflective support and the toner-receiving layer. A photo-like gloss that can be satisfied by one-time fixing by an electrophotographic image-receiving material, wherein the toner-receiving layer comprises inorganic fine particles having an average particle diameter of 1 to 200 nm. It has been found that an electrophotographic image-receiving material having image clarity and excellent scratch resistance with no occurrence of scratches, scratches, etc. can be realized.

  Details of the present invention will be described below.

《Insulation layer》
The electrophotographic image-receiving material of the present invention is characterized by having a heat insulating layer having a gap between the reflective support and the toner-receiving layer. By providing the heat insulating layer according to the present invention below the toner receiving layer, the diffusion of heat energy applied from a fixing roller or the like during fixing is blocked, and the melting and smoothing of the toner particles landed on the toner receiving layer are promoted. High gloss can be realized.

  In general, the heat insulating layer is a layer containing a constituent material having low thermal conductivity, and includes a method using a resin having low thermal conductivity, or a method using a material containing an air layer or bubbles. In the present invention, a heat insulating layer having a high porosity (void capacity) is preferable. The porosity of the heat insulating layer according to the present invention is preferably 40% or more, particularly preferably 50 to 90%.

  The material for forming the heat insulating layer having a high porosity defined in the present invention is not particularly limited as long as it has voids. For example, foamable plastics, hollow particles, and porous particles can be used.

(Foamable plastic)
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).

(Hollow particles)
The hollow particles contain air or other gas in the shell and inside of the thermoplastic resin, and indicate hollow particles that are already in a foamed state. The shape of the hollow particles is not particularly limited, and may be various shapes such as a true sphere, a flat shape, and an indefinite shape, but is preferably spherical. In addition, the hollow particles in the present invention are preferably those that are not deformed or destroyed when the heat-insulating layer coating solution is applied to the reflective support and dried.

  The average particle diameter of the hollow particles is preferably 0.2 to 5 μm. If it is less than 0.2 μm, a sufficient heat insulating effect as hollow particles cannot be obtained, and if it exceeds 5 μm, the smoothness is significantly lowered. The average particle diameter of the hollow particles can be determined by a known method, and can be measured using, for example, particle measurement with an electron microscope, a laser diffraction particle size distribution measuring apparatus, or the like.

  The hollow particles preferably have a hollow ratio of 40 to 95% defined by the inner diameter of the hollow particles / the outer diameter of the hollow particles × 100 (%). The inner diameter of the hollow particles can be determined by the particle size measurement method.

  Examples of the material constituting the shell of the hollow particles include styrene-acrylic copolymers such as styrene polymers, acrylic polymers, styrene-acrylonitrile copolymers, styrene-acrylonitrile-butadiene copolymers, Examples include polypropylene resin, polyvinyl chloride resin, polyvinylidene chloride resin, vinyl copolymer, urea formalin resin, and the like. Of these, styrene-acrylic copolymers are preferably used, but are not particularly limited thereto.

The hollow particles that can be used in the present invention are, for example, an acid group-containing monomer and a monomer copolymerizable therewith. For example, JP-A 64-1704, JP-A-5-279409, and 6 The binder described above can be produced with reference to the methods described in JP-A Nos. 248812, 10-11018, etc. The binder for dispersing and holding the hollow particles is not particularly limited, and examples thereof include styrene-butadiene rubber and styrene- Emulsion type synthetic resins such as methyl methacrylate-butadiene rubber, acrylic resin, acrylic-styrene resin, acrylic-maleic acid resin, acrylic-vinyl acetate resin, ethylene-vinyl acetate resin, water-soluble such as polyvinyl alcohol, starch, casein, gelatin Functional polymers, carboxymethyl cellulose, polyethylene oxide, etc. The Preferably, gelatin and polyvinyl alcohol are used.

(Porous particles)
The porous particles are porous particles having pores on the particle surface, and both inorganic porous particles and organic porous particles can be used.

  The inorganic porous particles are composed of amorphous silica, anhydrous silica, aluminum silicate, magnesium silicate, zinc silicate, calcium silicate, hydrotalcite, zeolite, satin white, titanium oxide, aluminum oxide. , Magnesium oxide, calcium carbonate, calcium sulfate, barium sulfate, diatomaceous earth, kaolin, talc, acidic clay, activated clay, bentonite and the like.

  The organic porous particles may be those obtained by an emulsion polymerization method, a suspension polymerization method, a dispersion polymerization method, or other polymerization methods, or may be a pulverized bulk porous resin. The resin component is not particularly limited, for example, polyester resin, methacrylic resin, polycarbonate resin, styrene copolymer resin, vinyl chloride resin, polypropylene resin, and blends thereof. Further, the means for making the resin particles porous or obtaining a porous resin is not particularly limited. Of these, organic porous particles obtained by emulsion polymerization are preferable, and for example, particle aggregate emulsion particles disclosed in JP-A-2-70741 are preferable. Furthermore, the dry structure described in JP-A-5-222108 is a multilayer structure emulsion particle having one or more through-holes connecting the inside from the surface layer portion of the particle and having a particle diameter of 0.1 to 5.0 μm. It is more preferable.

  The particle size of the porous particles is 0.05 to 50 μm, preferably 0.1 to 20 μm, more preferably 0.2 to 10 μm. If the particle size is less than 0.05 μm, it is difficult to make the particles porous. The particle size can be measured by the same method as for the hollow particles.

  Whether or not the porous particles are made porous can be apparent from an electron microscope or the like, but the degree of the porous formation can be confirmed by measuring the specific surface area with a mercury porosimeter. . Moreover, it can also confirm by the measurement of the oil absorption amount described in JIS K-5101. This utilizes the fact that a larger amount of oil is sucked than non-porous particles of the same component and the same particle size due to the capillary action of pores existing on and inside the particle.

  As the binder for dispersing and holding the porous particles, the same binder as the hollow particles can be used.

  In the present invention, it is more preferable to use hollow particles as a material for forming the heat insulating layer.

  The thickness of the heat insulating layer according to the present invention is preferably 15 to 150 μm, more preferably 20 to 100 μm, and most preferably 30 to 70 μm. If it is less than 15 μm, the heat insulating effect of the present invention is small, and if it exceeds 150 μm, it is not preferable from the viewpoint of productivity.

<Toner-receiving layer>
(Inorganic fine particles)
The present invention is characterized in that the toner receiving layer contains inorganic fine particles having an average particle diameter of 1 to 200 nm. Here, the average particle diameter is obtained by diluting the inorganic fine particle dispersion itself or by photographing the inorganic fine particles in the toner receiving layer with an electron micrograph and measuring the area of any 100 particles, and the circle is equal to the area. Can be obtained using the particle diameter represented by the diameter of the circle.

  Examples of the inorganic fine particles include silica fine particles, colloidal silica, alumina, colloidal alumina, colloidal titanium, zirconium sol, calcium silicate, zeolite, kaolinite, halloysite, muscovite, talc, calcium carbonate, calcium sulfate, boehmite and the like. it can. Preferable examples include colloidal silica and colloidal alumina. For example, in the case of colloidal silica, Nissan Chemical Industries, Ltd. (product names Snowtex C, Snowtex XL, etc.), and in the case of colloidal alumina, Kawaken Fine Chemicals, Inc. (product names: aluminum sol 10 and aluminum sol 10D). Etc.), and are commercialized by Nissan Chemical Industries, Ltd. (product names: alumina sol 100, alumina sol 200, etc.)

  In the present invention, the inorganic fine particles are more preferably a colloidal silica composite resin. Colloidal silica composite resin is obtained by polymerizing (including copolymerization) an ethylenically unsaturated monomer in the presence of colloidal silica, and having a Si—O—R (R: polymer component) bond. The production method is not particularly limited, and a polymerization method such as a solution polymerization method, a bulk polymerization method, an emulsion polymerization method, or a suspension polymerization method can be appropriately employed. α, β-ethylenically unsaturated carboxylic acid alkyl ether (hereinafter also referred to as ester monomer) and at least one monomer (a) selected from the group consisting of alkenylbenzene, and polymerizable unsaturated double in the molecule A monomer (b) containing a bond and an alkoxysilane group (hereinafter also referred to as a silane monomer) and colloidal silica (c) are each converted into solid content, and 100 parts by mass of (a). In an aqueous solvent in the presence of an anionic surfactant and / or a nonionic surfactant at a ratio such that (b) is 0.1 to 10 parts by mass and (c) is 10 to 200 parts by mass. A composition containing an aqueous resin dispersion obtained by emulsion copolymerization in (1) is preferred.

  Examples of the ester monomer include esters of (meth) acrylic acid and alkanols having 1 to 18 carbon atoms. Typical examples of the alkenylbenzene include styrene, α-methylstyrene, vinyltoluene and the like.

  Silane monomers include di- or trialkoxysilanes such as divinyldimethoxysilane, divinylbis-β-methoxy-ethoxysilane, vinyltriethoxysilane, vinyltris-β-methoxy-ethoxysilane, γ-methacryloxypropyltrimethoxysilane. Examples of such compounds are system compounds.

Colloidal silica is a dispersion in water whose basic unit is SiO ₂ , and in particular, one having a particle size of 4 to 100 nm can be exemplified. The state of the colloidal silica dispersion can be used on either the acidic side or the basic side, and can be appropriately selected according to various conditions during emulsion polymerization.

  The copolymerization ratio of each monomer (a), monomer (b) and colloidal silica (c) described above is preferably 100: 0.1 to 10: 1 to 200 in terms of solid content, more preferably Preferably it is 100: 0.5-5: 2-150. In addition, the monomer concentration at the time of superposition | polymerization is 20-70 mass% normally, Preferably it is about 30-60 mass%.

  Further, during the polymerization, a polymerization initiator (0.2 to 2% by mass based on the total amount of monomers, persulfate such as ammonium persulfate, hydrogen peroxide, etc.) and a chain transfer agent (0.1% relative to all monomers). 001 to 3 mass%, alkyl mercaptan, octyl thioglycolate, etc.) are added. In addition, a thickener, a wetting agent, a leveling agent, an antifoaming agent, a crosslinking agent, a resin, and the like may be added as appropriate.

  Examples of the colloidal silica composite resin include Movinyl 8020, 8030 and 8060 (trade names) manufactured by Nichigo Movinyl.

(Thermoplastic resin)
In the present invention, the toner receiving layer preferably contains 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, such as 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. Dicarboxylic acid components (these dicarboxylic acid components may be substituted with sulfonic acid groups, carboxyl groups, etc.) and diether derivatives of ethylene glycol, diethylene glycol, propylene glycol, bisphenol A, bisphenol A (for example, bisphenol A Ethylene oxide 2 adducts, propylene oxide 2 adducts of bisphenol A, etc.), bisphenol S, 2-ethylcyclohexyldimethanol, neopentyl glycol, cyclohexyldimethanol, glycerin and other alcohol components (these Polyester resin or polymethacrylic acid ester such as polyester resin, polymethyl methacrylate, polybutyl methacrylate, polymethyl acrylate, polybutyl acrylate, etc. obtained by condensation with a hydroxyl group may be substituted on the alcohol component) Resin, polycarbonate resin, polyvinyl acetate resin, styrene acrylate resin, styrene-methacrylate 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 film thickness of the thermoplastic resin constituting the toner receiving layer is generally from 0.1 to 50 μm, preferably from 0. 5 to 10 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.

  As the thermoplastic resin, a water dispersible resin is preferable. Examples of water-dispersible resins include polyvinyl acetate, polyurethane, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, polyacrylate ester, vinyl chloride-vinyl acetate copolymer and polybutyl methacrylate, and ethylene-vinyl acetate copolymer. Polymers, styrene-butadiene-acrylic copolymers, and latexes such as polyvinylidene chloride.

《Other additives for heat insulation layer and toner receiving layer》
In addition to the above-described additives, various additives can be used in the heat insulating layer or toner receiving 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.

(Plasticizer)
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).

(Filler)
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. Moreover, various inorganic fillers (or pigments) can be used as the filler.

(Crosslinking agent)
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. Examples of the coupling agent include chlorosilanes, vinyl silanes, epoxy silanes, aminosilanes, alkoxyaluminum chelates, titanate coupling agents, etc. "Handbook Rubber / Plastic Compounding Chemicals" (edited by Rubber Digest Co., Ltd.) The well-known thing described in etc. is mentioned.

(Charge modifier)
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 charge control agent include cationic antistatic agents such as quaternary ammonium salts, polyamine derivatives, cation-modified polymethyl methacrylate, and cation-modified polystyrene, anionic antistatic agents such as alkyl phosphates and anionic polymers, and fatty acids. Nonionic antistatic agents such as esters and polyethylene oxide are exemplified, but the invention is not limited thereto. The charge adjusting agent is preferably a cation or nonionic one when the toner has a negative charge.

(Conductive agent)
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. The metal oxides may further contain a different element, e.g., Al relative to ZnO, an In like, Nb relative to TiO _2, Ta or the like, for the SnO _2, Sb, Nb, A halogen element or the like can be contained (doping).

(Pigment)
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 optical brightener include K.I. The compounds described in “The Chemistry of Synthetic Dies” edited by Veen Rataraman, Vol. 8, Chapter 8, include stilbene compounds, coumarin compounds, biphenyl compounds, benzoxazoline compounds, naphthalimide compounds. , Pyrazoline compounds, carbostyryl compounds, and the like. Examples of these include white fur fur PSN, PHR, HCS, PCS, B manufactured by Sumitomo Chemical, and UVITEX-OB manufactured by Ciba-Geigy.

(dye)
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. Specific examples include C.I. I. Vat violet 1, C.I. I. Vat violet 2, C.I. I. Vat violet 9, C.I. I. Vat violet 13, C.I. I. Vat violet 21, C.I. I. Vat Blue 1, C.I. I. Vat Blue 3, C.I. I. Vat Blue 4, C.I. I. Vat Blue 6, C.I. I. Vat Blue 14, C.I. I. Vat Blue 20, C.I. I. Vat dyes such as Vat Blue 35, C.I. I. Dispers Violet 1, C.I. I. Disperse Violet 4, C.I. I. Disperse Violet 10, C.I. I. Disperse Blue 3, C.I. I. Disperse Blue 7, C.I. I. Disperse dyes such as Disperse Blue 58, C.I. I. Solvent Violet 13, C.I. I. Solvent Violet 14, C.I. I. Solvent Violet 21, C.I. I. Solvent Violet 27, C.I. I. Solvent Blue 11, C.I. I. Solvent Blue 12, C.I. I. Solvent Blue 25, C.I. I. Solvent Blue 55 etc. are mentioned. Also preferred are colored couplers used in silver salt photography.

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

The surface electrical resistance in the electrophotographic image-receiving material of the present invention is preferably 1 × 10 ⁶ to 1 × 10 ¹⁵ Ω (25 ° C., 65% RH condition). When the surface electrical resistance is less than 1 × 10 ⁶ Ω, the amount of toner when the toner is transferred to the toner receiving layer is not sufficient, and the density of the resulting toner image is low, whereas 1 × 10 ¹⁵ If it exceeds Ω, more charge than necessary is generated at the time of transfer, the toner is not transferred sufficiently, the density of the image becomes low, dust is easily attached due to static electricity during handling of the electrophotographic image receiving material, This is not preferable in that misfeed, double feed, discharge mark, toner transfer missing, etc. are likely to occur during copying.

(Matting agent)
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 matting 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.

(Slip agent)
A slipping agent can be added to the toner receiving layer according to the present invention. Examples of the slip agent include various known ones such as higher alkyl sulfate, higher fatty acid higher alcohol ester, carbowax, higher alkyl phosphate ester, silicone compound, modified silicone, curable silicone, and the like. Polyolefin wax, fluorine oil, fluorine wax, carnauba wax, microcrystalline wax, silane compound and the like.

There is no restriction | limiting in particular as the usage-amount of a slip agent in a toner receiving layer, Although it can select suitably according to the objective, 30-3000 mg / m < ² > is preferable and 100-1500 mg / m < ² > is more preferable. In the case of so-called oil-less fixing in which no oil is used for the purpose of preventing the offset to the fixing member in the fixing unit, 5 to 500 mg / m ² is preferable, and 10 to ²⁰⁰ mg / m ² is more preferable. As for the amount of slip agent used, among the slip agents, wax-based ones are difficult to dissolve in an organic solvent. Therefore, an aqueous dispersion is prepared, and a dispersion with a thermoplastic resin solution is prepared and applied. . In this case, the wax-based slip agent is present in the form of fine particles in the thermoplastic resin. In this case, the amount of the lubricant is preferably ^{5~10000mg / m 2, 50~5000mg / m} 2 is more preferable.

<Reflective support>
The reflective support according to the present invention (hereinafter also simply referred to as a support) can withstand the fixing temperature, and has such points as smoothness, whiteness, slipperiness, friction, antistatic properties, and dents after fixing. As long as the requirements can be satisfied, there is no particular limitation, and it can be selected appropriately according to the purpose. Examples include papers described in pages (223) to (240) of Corona Publishing (Showa 54), photographic supports such as synthetic polymers (films), and the like.

  Specific examples of the support include synthetic paper (polyolefin-based, polystyrene-based synthetic paper), high-quality paper, art paper, (double-sided) coated paper, (double-sided) cast-coated paper, and synthetic resin pulp such as polyethylene and natural pulp. Mixed paper, Yankee paper, baryta paper, wallpaper, backing paper, synthetic resin or emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin internal paper, paperboard, cellulose fiber paper, polyolefin coated paper (especially polyethylene) Paper coated with both sides), polyolefin, polyvinyl chloride, polyethylene terephthalate, polystyrene methacrylate, polyethylene naphthalate, polycarbonate polyvinyl chloride, polystyrene, polypropylene, polyimide, celluloses (eg triacetyl cellulose), etc. Various pluses The Kkufirumu or sheet impart white reflection treatment (e.g., pigment processing such inclusion such as titanium oxide into the film) subjected films or sheets, fabrics, metals, glasses, and the like.

  These may be used individually by 1 type and may be used together as a laminated body using 2 or more types. Among these, it is preferable to select from a base paper (also referred to as RC base paper) formed by coating one side or both sides of a base paper with a resin film (polyethylene or the like).

As thickness of a support body, it is 25-300 micrometers normally, and 50-270 micrometers is more preferable. The stiffness and smoothness of the support are not particularly limited and may be appropriately selected depending on the intended purpose. However, for a photographic image receiving paper, a support close to a color silver salt photograph is preferable. The density of the support is preferably 0.7 g / cm ³ or more from the viewpoint of fixing performance.

  The thermal conductivity of the support is not particularly limited and may be appropriately selected depending on the intended purpose. From the viewpoint of fixing performance, it is 2.1 kW / under 20 ° C. and 65% relative humidity. It is preferably m · h · ° C. or higher. The thermal conductivity can be measured by a method described in JP-A-53-66279 using a transfer paper conditioned according to JIS P8111.

  Various additives appropriately selected according to the purpose can be added to the support according to the present invention within a range that does not impair the effects of the present invention. Examples of the additive include whitening agents, conductive agents, fillers, pigments such as titanium oxide, ultramarine blue, and carbon black, and dyes.

  In addition, one or both surfaces of the support according to the present invention can be subjected to various surface treatments and undercoating treatments for the purpose of improving the adhesion with a layer provided thereon. Examples of the surface treatment include activity of glossy surface or fine surface, mat surface, or silk surface described in JP-A-55-26507, corona discharge treatment, flame treatment, glow discharge treatment, plasma treatment, etc. And the like. 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.

  A hydrophilic binder, a semiconductive metal oxide such as alumina sol or tin oxide, and carbon black or other antistatic agent may be applied to the support, the front surface or the back surface of the support, or a combination thereof. . Specific examples of such a support include those described in JP-A No. 63-220246.

《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 toner receiving layer is provided. Further, the back layer may have the same configuration as that of the receiving layer for improving 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 receiving layer itself. Examples of such additives include various known antioxidants, anti-aging agents, ultraviolet absorbers, light stabilizers, deterioration inhibitors, ozone deterioration inhibitors, antiseptics, and antifungal agents.

  The electrophotographic image-receiving paper 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 electrophotographic toner used for image formation on the electrophotographic image-receiving material of the present invention is not particularly limited and can be appropriately selected according to the purpose. Any of a pulverization method, a suspension granulation method, etc. An electrophotographic toner obtained by a suspension granulation method is preferable for obtaining the effects of the present invention.

  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. From the viewpoint of manifesting the effects of the present invention, the suspension polymerization method and emulsion polymerization of the monomer in a liquid to which the necessary additive emulsion is added to produce fine polymer particles, In addition, a production method in which an organic solvent, an aggregating agent, and the like are added and associated is preferable. At the time of association, a method of preparing by mixing with a dispersion liquid of a release agent or a colorant necessary for the constitution of the toner and making it associate, or a toner constituent component such as a release agent or a colorant in the monomer A method in which emulsion polymerization is carried out after dispersing is preferred. Here, the association means that a plurality of resin particles and colorant particles are fused.

  Although it does not specifically limit as a manufacturing method of 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 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 of 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 dried to prepare a toner.

  In addition, as a method for producing the toner according to the present invention, 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 colorants, etc., or particles composed of resin and colorant, particularly after dispersing them in water using an emulsifier, The above flocculant is added and salted out, and at the same time, heat fusion is performed at a temperature equal to or higher than the glass transition temperature of the formed polymer itself, and the particles are preferably heated and dried in a fluid state while being in a water-containing state. An applicable toner 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 lowered. On the other hand, when the toner exceeds 10 μm, the resolution of the image may be lowered. 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 << Preparation of Reflective Support >>
[Preparation of Reflective Support A]
A white base paper 1 having a basis weight of 160 g / m ^{2 made} of 50% sulfate method bleached hardwood pulp (LBKP) and 50% sulfate method bleached softwood pulp (NBSP) was prepared.

Polyethylene was melt-extruded and laminated at 300 ° C. as a back resin layer on the back surface of the white base paper 1 to cover a back laminate layer of 20 g / m ² .

Next, as a surface resin layer on the front side, 91% polyethylene and 9% rutile titanium oxide were kneaded, and then a water-resistant resin layer of 15 g / m ² was coated by melt extrusion lamination at 300 ° C. A reflective support A having a layer was prepared.

[Preparation of Reflective Support B]
Sulfate bleached hardwood pulp (LBKP) 90%, Sulfate bleached softwood pulp (NBSP) 10% pulp blend, 0.7% cationic starch, 0.07% alkenyl succinic anhydride, heavy The raw material prepared by adding 20% calcium carbonate and 1% band is made with a long paper machine, and an aqueous solution containing polyacrylamide and alkyl ketene dimer as a surface sizing agent is added to both sides of the dry solid in a size press. treated so that the .9g / m ^2, to obtain a white base paper 2 after drying basis weight 170 g / m ^2.

Separately, 0.1% 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 solution is applied to the surface side of the white base paper 2 with a reverse roll coater so that the dry mass becomes 20 g / m ^2, and then pressure-dried to a cast dryer at 100 ° C. to provide a reflective support as cast-coated paper. B was produced.

<Production of electrophotographic image receiving material>
[Preparation of Sample 101]
On the reflection support A produced above, the following toner receiving layer coating solution 1 was applied using a slide hopper type coating device under the condition of a dry film thickness of 10 μm, and then kept at 4 ° C. After passing through the zone for 20 seconds, the sample 101 was produced by drying with a wind of 30 ° C. for 60 seconds, a wind of 45 ° C. for 60 seconds, and a wind of 50 ° C. for 60 seconds.

(Toner-receiving layer coating solution 1)
Polyester resin water dispersion (Vaironal MD1100; manufactured by Toyobo Co., Ltd., solid content 30%)
50% by mass
Gelatin 2% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
45% by weight of water
[Production of Sample 102]
A sample 102 was prepared in the same manner as in the preparation of the sample 101 except that the heat-insulating layer coating solution 1 having the following constitution was used instead of the toner-receiving layer coating solution 1.

(Insulation layer coating solution 1)
Hollow particle dispersion (MH8101, manufactured by Nippon Zeon Co., Ltd., spherical diameter = 1.0 μm, solid content 26.5%) 50% by mass
Gelatin 4% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 2% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
42% by weight of water
[Production of Sample 103]
A sample 103 was prepared in the same manner as in the preparation of the sample 102, except that the coating was performed under the condition that the dry film thickness of the heat insulating layer was 40 μm.

[Production of Sample 104]
In the preparation of Sample 103, the same applies except that the heat-insulating layer coating solution 1 (dry film thickness 40 μm) is used as the lower layer, and the toner receiving layer coating solution 2 (dry film thickness 5 μm) having the following configuration is used as the upper layer. Thus, a sample 104 was produced.

(Toner-receiving layer coating solution 2)
Acrylic resin aqueous dispersion (Movinyl 745; manufactured by Nichigo Mobigny, solid content 38%) 40% by mass
Gelatin 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
55% by weight of water
[Preparation of Sample 105]
Sample 105 was prepared in the same manner as in the preparation of Sample 104, except that instead of the toner receiving layer coating solution 2, a toner receiving layer coating solution 3 (dry film thickness 5 μm) having the following constitution was applied as an upper layer. Was made.

(Toner-receiving layer coating solution 3)
Acrylic resin aqueous dispersion (Movinyl 745; Nichigo Movinyl, solid content 38%)
20% by mass
Synthetic silica (Silysia 310; manufactured by Fuji Silysia Chemical Ltd., average particle size 1.4 μm)
8% by mass
Gelatin 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
67% by weight of water
[Production of Sample 106]
Sample 106 was prepared in the same manner as in the preparation of sample 104 except that instead of the toner receiving layer coating solution 2, a toner receiving layer coating solution 4 (dry film thickness 5 μm) having the following constitution was applied as an upper layer. Was made.

(Toner-receiving layer coating solution 4)
Acrylic resin aqueous dispersion (Movinyl 745; Nichigo Movinyl, solid content 38%)
20% by mass
Colloidal silica (MP-4540M; manufactured by Nissan Chemical Industries, average particle size 450 nm, solid content 40%) 20% by mass
Gelatin 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
55% by weight of water
[Preparation of Sample 107]
Sample 107 was prepared in the same manner as in the preparation of Sample 104 except that instead of the toner-receiving layer coating solution 2, a toner-receiving layer coating solution 5 (dry film thickness 5 μm) having the following constitution was applied as an upper layer. Was made.

(Toner-receiving layer coating solution 5)
Acrylic resin aqueous dispersion (Movinyl 745; Nichigo Movinyl, solid content 38%)
20% by mass
Colloidal silica (MP-3040; manufactured by Nissan Chemical Industries, average particle size 300 nm, solid content 40%) 20% by mass
Gelatin 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
55% by weight of water
[Production of Sample 108]
Sample 108 was prepared in the same manner as in the preparation of Sample 104, except that instead of the toner receiving layer coating solution 2, a toner receiving layer coating solution 6 (dry film thickness 5 μm) having the following constitution was applied as an upper layer. Was made.

(Toner-receiving layer coating solution 6)
Acrylic resin aqueous dispersion (Movinyl 745; Nichigo Movinyl, solid content 38%)
20% by mass
Colloidal silica (MP-2040; manufactured by Nissan Chemical Industries, average particle size 200 nm, solid content 40%) 20% by mass
Gelatin 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
55% by weight of water
[Production of Sample 109]
Sample 109 was prepared in the same manner as in the preparation of Sample 104 except that instead of the toner receiving layer coating solution 2 described above, a toner receiving layer coating solution 7 (dry film thickness 5 μm) having the following constitution was applied as an upper layer. Was made.

(Toner-receiving layer coating solution 7)
Acrylic resin aqueous dispersion (Movinyl 745; Nichigo Movinyl, solid content 38%)
20% by mass
Colloidal silica (MP-1040; manufactured by Nissan Chemical Industries, average particle size 100 nm, solid content 40%) 20% by mass
Gelatin 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
55% by weight of water
[Preparation of Sample 110]
Sample 110 was prepared in the same manner as in the preparation of Sample 104, except that instead of the toner receiving layer coating solution 2, a toner receiving layer coating solution 8 (dry film thickness 5 μm) having the following constitution was applied as an upper layer. Was made.

(Toner-receiving layer coating solution 8)
Acrylic resin aqueous dispersion (Movinyl 745; Nichigo Movinyl, solid content 38%)
20% by mass
Colloidal silica (Snowtex XL; manufactured by Nissan Chemical Industries, average particle size 50 nm, solid content 40%) 20% by mass
Gelatin 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
55% by weight of water
[Production of Sample 111]
In the production of the sample 110, a sample 111 was produced in the same manner except that the reflective support B was used instead of the reflective support A.

[Preparation of Sample 112]
Sample 112 was prepared in the same manner as in the preparation of Sample 104 except that instead of the toner receiving layer coating solution 2, a toner receiving layer coating solution 9 (dry film thickness 5 μm) having the following constitution was applied as an upper layer. Was made.

(Toner-receiving layer coating solution 9)
Acrylic resin aqueous dispersion (Movinyl 745; Nichigo Movinyl, solid content 38%)
20% by mass
Colloidal silica (Snowtex 30; manufactured by Nissan Chemical Industries, average particle size 15 nm, solid content 30%) 25% by mass
Gelatin 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
50% by weight of water
[Production of Sample 113]
A sample 113 was prepared in the same manner as in the preparation of the sample 101 except that the toner receiving layer coating solution 8 (dry film thickness 5 μm) was used instead of the toner receiving layer coating solution 1.

[Production of Sample 114]
Sample 114 was prepared in the same manner as in the preparation of Sample 104 except that instead of the toner receiving layer coating solution 2, a toner receiving layer coating solution 10 (dry film thickness: 1 μm) having the following constitution was applied as an upper layer. Was made.

(Toner-receiving layer coating solution 10)
Colloidal silica (Snowtex XL; manufactured by Nissan Chemical Industries, average particle size 50 nm, solid content 40%) 40% by mass
Gelatin 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
55% by weight of water
[Preparation of Sample 115]
Sample 115 was prepared in the same manner as in the preparation of Sample 104 except that instead of the toner receiving layer coating solution 2 described above, a toner receiving layer coating solution 11 (dry film thickness 1 μm) having the following constitution was applied as an upper layer. Was made.

(Toner-receiving layer coating solution 11)
Colloidal alumina (alumina sol 100; manufactured by Nissan Chemical Industries, average particle size 55 nm, solid content 10%) 40% by mass
Polyvinyl alcohol (PVA117; manufactured by Kuraray Industries, average polymerization degree 1700)
1.5% by mass
Surfactant (Surfinol 465; manufactured by Nissin Chemical Industry Co., Ltd.) 0.5% by mass
58% by weight of water
[Preparation of Sample 116]
In the preparation of the sample 104, the sample 116 was prepared in the same manner except that the toner receiving layer coating solution 12 (dry film thickness 5 μm) having the following constitution was used as an upper layer instead of the toner receiving layer coating solution 2 and the multilayer coating was performed. Produced.

(Toner-receiving layer coating solution 12)
Polyester resin water dispersion (Vaironal MD1100; manufactured by Toyobo Co., Ltd., solid content 30%)
25% by mass
Colloidal silica (Snowtex XL; manufactured by Nissan Chemical Industries, average particle size 50 nm, solid content 40%) 20% by mass
Gelatin 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
50% by weight of water
[Preparation of Sample 117]
In the production of the sample 110, the sample 117 was produced in the same manner except that the thermal insulation layer coating solution 2 (dry film thickness 40 μm) having the following constitution was used as a lower layer instead of the thermal insulation layer coating solution 1 and the multilayer coating was performed. did.

(Insulation layer coating solution 2)
Spherical porous silica particles (Sunsphere H33, manufactured by Asahi Glass Suitec)
15% by mass
Gelatin 4% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 2% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
77% by weight of water
[Preparation of Sample 118]
In the production of the sample 110, the sample 118 was produced in the same manner except that the thermal insulation layer coating solution 3 (dry film thickness 40 μm) having the following constitution was used as a lower layer instead of the thermal insulation layer coating solution 1 and the multilayer coating was applied. did.

(Insulation layer coating solution 3)
Organic porous particles (MBP-8, manufactured by Sekisui Plastics Co., Ltd.) 15% by mass
Gelatin 4% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 2% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
77% by weight of water
[Preparation of Sample 119]
Sample 112 was prepared in the same manner as in the preparation of Sample 104, except that instead of toner receiving layer coating solution 2 described above, toner receiving layer coating solution 13 (dry film thickness 5 μm) having the following constitution was applied as an upper layer. Was made.

(Toner-receiving layer coating solution 13)
Colloidal silica composite acrylic resin aqueous dispersion (Movinyl 8030; manufactured by Nichigo Movinyl, solid content 44%, average particle size of colloidal silica particles of about 20 nm) 35% by mass
Gelatin 2% by mass
2,4-dichloro-6-hydroxy-1,3,5-s-triazine sodium salt aqueous solution (solid content 7.5%) 1% by mass
Dioctyl sodium sulfosuccinate aqueous solution (solid content 20%) 2% by mass
60% by weight of water
[Preparation of Sample 120]
Sample 120 was prepared in the same manner as Sample 119, except that reflective support B was used instead of reflective support A.

<Evaluation of electrophotographic image receiving materials>
[Evaluation of image printing, gloss, image clarity, and abrasion resistance]
Using the printer magiccolor 2430DL manufactured by Konica Minolta Business Technologies Co., Ltd. modified so that the conveyance speed and the temperature of the fixing device can be changed, the fixing conditions of the heating roller of 200 ° C. and the fixing speed of 50 mm / sec A magenta image and a white image were output and the following evaluation was performed. For the magenta image, the toner for magiccolor 2430DL was used, and the amount with toner was adjusted to 10 g / m ² .

(Glossiness)
The magenta image portion formed on each sample was measured for 20-degree glossiness with a digital variable-angle gloss meter (manufactured by Suga Test Instruments, UGV-5D) according to JIS Z 8741, and the glossiness was determined.

(Image clarity)
The magenta image portion formed on each sample was measured for the image clarity (gloss value C value%) at a reflection of 60 degrees and an optical comb of 2 mm with an image clarity measuring device ICM-1DP (manufactured by Suga Test Instruments Co., Ltd.).

(Abrasion resistance)
The scratch resistance was evaluated according to the scratch strength test method for the white image area.

  The scratch strength was measured according to JIS-K-6717. As a measuring device for scratch strength, a continuous weighted scratch strength tester (Shinto Kagaku scratch meter HEIDON-18 type) is used, scratching distance is 100 mm, weight is 0.98 N (100 g), scratching needle is 0.5 mm (sapphire). Measurement).

  Scratch strength is determined by changing the load sequentially from the scratch start point (load 0 g), measuring the load at the point where the surface begins to scratch, and setting the load value (g) as the scratch strength. It was. The higher the value, the better the abrasion resistance.

  Table 1 shows the evaluation results obtained as described above.

  As is clear from Table 1, the samples satisfying the conditions specified in the present invention have improved abrasion resistance, gloss of the print after image output, and image clarity, and improved handling and image quality compared to the comparative example. You can see that.

Claims (5)

In an electrophotographic image-receiving material having a toner receiving layer on a reflective support, the electrophotographic image-receiving material has a heat insulating layer having at least one void between the reflective support and the toner receiving layer, and the toner receiving layer has an average An electrophotographic image-receiving material comprising inorganic fine particles having a particle size of 1 to 200 nm. 2. The electrophotographic image receiving material according to claim 1, wherein the toner receiving layer contains inorganic fine particles having an average particle diameter of 1 to 200 nm and a thermoplastic resin. 3. The electrophotographic image-receiving material according to claim 2, wherein the inorganic fine particles having an average particle diameter of 1 to 200 nm and a thermoplastic resin are an integrated colloidal silica composite resin. The electrophotographic image receiving material according to claim 1, wherein the heat insulating layer contains hollow particles. The electrophotographic image receiving material according to claim 1, wherein the heat insulating layer has a thickness of 15 to 150 μm.