JP2001183860A - Electrophotographic image receiving material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrophotographic image receiving material excellent in smoothness (gloss), usable in photographic use and not causing adhesion and blocking in storage. SOLUTION: In the electrophotographic image receiving material with a thermoplastic resin-containing toner image receiving layer on the substrate, at least one constituent layer of the image receiving material on the side with the toner image receiving layer contains one or more sorts of organic and/or inorganic fine particles and has a surface glossiness Gs (45 deg.) of >=40 measured at 45 deg. incident angle according to JIS Z 8741.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic image receiving material. More specifically, the present invention relates to an electrophotographic image receiving material which is suitable for photographic use and has excellent storage stability.

[0002]

2. Description of the Related Art Electrophotography is an image forming method utilizing a photoconductive effect and an electrostatic phenomenon, and is widely used in various fields. An image formed by electrophotography may be formed on a semiconductor material itself such as zinc oxide paper, or may be formed by transferring the semiconductor material to an image receiving material having a toner image receiving layer. The latter xerography method is widely used in office copying machines and the like, and its image forming principle is as follows.

[0003] First, a photosensitive plate using a photoconductor such as selenium is subjected to corona discharge or the like in a dark place to give an electrostatic charge.
Next, when the original image is exposed, the charge escapes at the location where the light hits, and the remaining portion becomes a latent image. When the negatively charged toner is spread over the carrier and introduced therein, the toner adheres to the latent image. If an image receiving material made of paper or the like is applied thereon and heated, the toner is transferred to the image receiving material, and an image is formed on the image receiving material.

In color copiers and personal computer color output machines, which have become more popular in recent years, this method is performed using colored toner. The color electrophotographic method is extremely useful because it can be printed on general-purpose paper (plain paper or high-quality paper) at a high printing speed by dry processing. On the other hand,
When color electrophotography is used, the purpose is often to record images such as faces and landscapes rather than characters, and it is required that the formed images be clear and of high quality. However, even when color copying is performed using general-purpose paper, a clear and high-quality image cannot be formed because of particularly poor gloss.

To cope with this problem, Japanese Patent Laid-Open Publication No.
In Japanese Patent No. 2168 and Japanese Unexamined Patent Publication No. Hei 8-21645,
It has been proposed to provide a toner image receiving layer containing a thermoplastic resin on a support. However, such a high-gloss electrophotographic image-receiving sheet has a contact surface when it is stored in a product state or a state after image formation, with the back side and the front side, or the front side and the top side, or when stored in a filing case or the like. In addition, problems such as adhesion and blocking of the thermoplastic resin toner image occur.

[0006]

In view of the above problems of the prior art, the present invention is excellent in smoothness (gloss) and can be used for photographic applications, and can prevent adhesion and blocking during storage. An object of the present invention is to provide an electrophotographic image-receiving material that does not cause any problem.

[0007]

An object of the present invention is to provide an electrophotographic image receiving material having a toner image receiving layer containing a thermoplastic resin on a support, wherein the toner image receiving layer is provided as a layer constituting the electrophotographic image receiving material. At least one of the sides is organic and / or
Or one or more kinds of inorganic fine particles and JIS
This problem has been solved by the present invention which provides an electrophotographic image-receiving material, wherein the surface gloss Gs (45 °) measured at an incident angle of 45 ° according to Z 8741 is 40 or more.

The organic and / or inorganic fine particles used in the electrophotographic image-receiving material of the present invention have a refractive index of 0.8 to 3.0.
It is preferred that Further, the image receiving material for electrophotography of the present invention has a JIS Z87 after forming a toner image.
The surface gloss Gs (4
(5 °) is preferably 60 or more. In this specification, “to” indicates a range that includes numerical values described before and after it as a minimum value and a maximum value, respectively.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the electrophotographic image receiving material of the present invention will be described in detail. The electrophotographic image-receiving material of the present invention has a toner image-receiving layer containing a thermoplastic resin on a support. The feature is that at least one layer on the side provided with the toner image receiving layer in the layer constituting the electrophotographic image receiving material contains at least one kind of organic and / or inorganic fine particles, and that at an incident angle of 45 degrees according to JIS Z8741. The measured surface gloss Gs (45 °) is 40 or more.

The support constituting the electrophotographic image-receiving material of the present invention can withstand the fixing temperature, has smoothness,
Any material can be used as long as it can satisfy the requirements in terms of whiteness, slipperiness, friction, antistatic property, dent after fixing and the like. Generally, edited by the Photographic Society of Japan, "Basics of Photographic Engineering-Silver halide photography-", published by Corona Co., Ltd. (Showa 54
Years) Papers described on pages (223) to (240) and photographic supports such as synthetic polymers (films). Specifically, synthetic paper (synthetic paper of polyolefin, polystyrene, etc.),
Fine paper, art paper, (both sides) coated paper, (both sides) cast coated paper, mixed paper made from synthetic resin pulp such as polyethylene and natural pulp, Yankee paper, baryta paper, wallpaper, backing paper, synthetic resin or emulsion Paper supports such as impregnated paper, synthetic rubber latex impregnated paper, synthetic resin-filled paper, paperboard, cellulose fiber paper, polyolefin-coated paper (especially paper coated on both sides with polyethylene), polyolefin, polyvinyl chloride, polyethylene terephthalate,
Polystyrene methacrylate, polyethylene naphthalate, polycarbonate polyvinyl chloride, polystyrene,
Various plastic films or sheets of polypropylene, polyimide, celluloses (for example, triacetylcellulose), etc., and a treatment for giving the plastic white reflectivity (for example, a treatment for incorporating a pigment such as titanium oxide in the film). Films or sheets, cloths, metals, glasses and the like are used. These can be used alone or as a support laminated on one or both sides with a synthetic polymer such as polyethylene. Also, a laminate of any combination of the above-mentioned supports can be used. In addition, Japanese Patent Laid-Open No. 62-25 / 1987
No. 3159, pp. 29-31, JP-A-1-6123
No. 6, pages 14 to 17; JP-A-63-316848.
Gazette, JP-A-2-22651, and 3-5695
No. 5, US Pat. No. 5,001,033 and the like can be used.

The thickness of these supports is usually from 25 to 30.
0 μm, more preferably 50 to 260 μm, and more preferably about 75 to 220 μm. Various stiffnesses can be used according to the purpose, but those which are close to a support for a color silver halide photograph are preferably used in order to receive a photographic image. The same applies to the smoothness. From the viewpoint of fixing performance, the support preferably has a thermal conductivity of 0.50 kcal / m · h · ° C. or more under the conditions of 20 ° C. and a relative humidity of 65%. The thermal conductivity can be measured on a transfer paper conditioned according to JIS P 8111 by the method described in JP-A-53-66279.
The density of the support is 0.7 g / cm ³ from the above viewpoint.
It is preferable that it is above.

Various additives appropriately selected can be added to these constituent layers of the support within a range that does not impair the object of the present invention. For example, a whitening agent, a conductive agent, a filler, a pigment or dye such as titanium oxide, ultramarine blue, carbon black, or the like can be contained as necessary. One or both surfaces of these supports can be subjected to various surface treatments or undercoats for the purpose of improving the adhesion to a layer provided thereon. As the surface treatment, for example, a glossy surface or JP-A-55-2650
No. 7, a fine surface, a matte surface or a silk surface type molding process, a corona discharge process, a flame process, a glow discharge process,
Alternatively, an activation treatment such as a plasma treatment is given.
As the undercoat, for example, a method described in JP-A-61-846443 can be used. In addition, these may be used alone, or may be subjected to activation treatment after performing molding or the like, or may be used in combination in any combination, such as performing undercoating after surface treatment such as activation treatment. it can. During the construction of these supports and the front and back surfaces, and in combinations thereof, a semiconductive metal oxide such as a hydrophilic binder and alumina sol or tin oxide,
Carbon black or another antistatic agent may be applied. Specifically, supports described in JP-A-63-220246 can be used.

The electrophotographic image-receiving material of the present invention is composed of several layers on a support according to the purpose, and is provided with an image-receiving layer for receiving at least color and black toner and forming an image. In addition to the image receiving layer, a surface protective layer, an intermediate layer, an undercoat layer, a cushion layer, a charge control (prevention) layer,
A reflective layer, a color adjusting layer, a storage stability improving layer, an adhesion preventing layer, an anti-curl layer, a smoothing layer, and the like can be provided. Each layer may be composed of two or more layers.

In the case of a transmission type image receiving material in which an image receiving layer or the like is provided on a transparent support, it is preferable that each layer on the support is also transparent. In the case of a reflection type image receiving material in which an image receiving layer or the like is provided on a reflective support, each layer on the support does not need to be transparent, but is preferably white. The whiteness is measured by a method specified in JIS P 8123, and is preferably 85% or more. In addition, 440-640n
It is preferable that the spectral reflectance in the wavelength range of m is 85% or more, and the difference between the maximum spectral reflectance and the minimum spectral reflectance in the same wavelength range is 5% or less. More preferably, the spectral reflectance is 85% or more in the wavelength range of 400 to 700 nm, and the difference between the maximum spectral reflectance and the minimum spectral reflectance in the same wavelength range is within 5%. In the electrophotographic image receiving material of the present invention, a back layer can be provided on the opposite side of the support from the image receiving layer.

In the case of a transmission type image receiving material in which an image receiving layer or the like is provided on a transparent support, it is preferable that the back layer is also transparent, but a reflection type image receiving material in which the image receiving layer or the like is provided on a reflective support is preferred. In that case, the back layer does not need to be transparent,
Any color is acceptable. However, in the case of a double-sided output type image receiving material which forms an image also on the back surface, the back layer is also preferably white. The whiteness and the spectral reflectance are preferably 85% or more as in the case of the surface. The electrophotographic image-receiving material of the present invention has an opacity of preferably 85% or more, and more preferably 90%, as measured by a method specified in JIS P8138.
The above is more preferable.

Organic and / or inorganic fine particles (hereinafter, abbreviated as matting agents) as used in the present invention are well known in the photographic art, and include organic and / or inorganic fine particles which can be dispersed in a new aqueous organic colloid binder. And / or may be defined as discontinuous solid particles of an inorganic material.

Examples of inorganic matting agents include oxides (eg, silicon dioxide, titanium oxide, magnesium oxide, aluminum oxide, etc.) and alkaline earth metal salts (eg, sulfates and carbonates, specifically barium sulfate. , Magnesium sulfate, calcium carbonate, etc.), silver halide grains which do not form an image (silver chloride, silver bromide, etc., and a small amount of iodine atom may be added as a halogen component), glass, etc. Among them, aluminum oxide and silicon dioxide are preferable.

Regarding the inorganic matting agent, West German Patent No. 25
No. 29321, British Patent No. 760775, Japanese Patent No. 1260772, U.S. Pat. No. 120
No. 1905, Japanese Patent No. 2192241, Japanese Patent No. 3053662, Japanese Patent No. 3062649, Japanese Patent No. 3257206, Japanese Patent No. 332
No. 2555, Japanese Patent No. 3353958, Japanese Patent No. 3370951, Japanese Patent No. 3411907, Japanese Patent No. 3347484, Japanese Patent No. 352
No. 3022, Japanese Patent No. 3615554, Japanese Patent No. 3635714, Japanese Patent No. 3769020, Japanese Patent No. 40221245, Japanese Patent No. 402
No. 9504.

Examples of the organic matting agent include starch, cellulose ester (for example, cellulose acetate propionate, etc.), cellulose ether (for example, ethyl cellulose, etc.), and synthetic resin. Examples of synthetic resins are water-insoluble or poorly soluble synthetic polymers such as alkyl (meth) acrylate, alkoxyalkyl (meth) acrylate, glycidyl (meth) acrylate, (meth) acrylamide, vinyl ester (eg vinyl acetate), acrylonitrile Olefin (eg, ethylene, propylene), styrene, benzoguanamine resin, formaldehyde condensation polymer, epoxy resin, amide, carbonate, phenol resin, vinyl carbazole and polyvinylidene chloride alone or in combination, or acrylic acid, methacrylic acid, α , Β} unsaturated dicarboxylic acid, hydroxyalkyl (meth) acrylate, sulfoalkyl (meth) acrylate, styrenesulfonic acid And a copolymer having a combination of repeating units or repeating units can be used. In the case of a copolymer, a small amount of a hydrophilic repeating unit may be contained. Examples of the monomer that forms the hydrophilic repeating unit include acrylic acid, methacrylic acid, α, β-unsaturated dicarboxylic acid, hydroxyalkyl (meth) acrylate, sulfoalkyl (meth) acrylate, and styrene sulfonic acid. When these are crosslinked, they can be used very preferably because of their excellent heat resistance. Among the above, crosslinked polymethyl methacrylate, polyethylene, crosslinked polystyrene, benzoguanamine resin, and formaldehyde condensation polymer are preferred.

Regarding the organic matting agent, British Patent No. 10
No. 55713, US Pat. No. 1,939,213, Japanese Patent No. 2,221,873, Japanese Patent No. 22686.
No. 62, Japanese Patent No. 23222037, Japanese Patent No. 2376005, Japanese Patent No. 2391181, Japanese Patent No. 2701245, Japanese Patent No. 29921
No. 01, Japanese Patent No. 3079257, Japanese Patent No. 3262782, Japanese Patent No. 3444346, Japanese Patent No. 3516832, Japanese Patent No. 35393.
No. 44, Japanese Patent No. 3,591,379, Japanese Patent No. 3,754,924, Japanese Patent No. 3,767,448, Japanese Patent Application Laid-Open No. 49-106821, and Japanese Patent Application Laid-Open No. 57-148.
No. 35 describes this. Commercially available products include, for example, AS-10, AS-20, AS-30, and AS-
40, AS-50, Sumitomo Seika Flow Beads LE-10
80, LE-2080, EA-209, CL-208
0, Flowsen UF-1.5, UF-4, Nippon Shokubai Eposter S, S12, M30, MS, L15, GP-5
0, GP-70, GP-90, Sekisui Plastics Techpolymer SBX-6, SBX-8, SBX-12, SBX
-17, MBX-8, MBX-12, MBX-15, M
BX-20, MBX-30, Soken Chemical's MR-2G, M
R-7G, MR-10G, MR-20G, SGP-70
C, SGP-100C, Fuji Silysia Chemical Sylysia 250, 250N, 256, 256N, 310, 32
0, 350, 370, 430, 440, 450, 47
0, 435, 445, 436, 446, 456, 47
6, 530, 550, 730, 740, 770, Ganz Pearl GM-0600, GM-1005, manufactured by Ganz Kasei
GM-2005, GM-0401, GM-0801, G
M-2001, GB-0502, GB-0802, GB
-1002, GB-2002, Dow Corning Toray
Silicone Trefil R-900, R-902A, Toshiba Silicone Tospearl 105, 120, 130, 1
No. 45, 3120, 240, Matsumoto Microspor F-30 manufactured by Matsumoto Yushi-Seiyaku, and starch such as wheat or titanium oxide may be used. Above all, AS-10, AS-20, AS-30 manufactured by Showa Denko, Eposter L15 manufactured by Nippon Shokubai, Techpolymer SB manufactured by Sekisui Plastics Co., Ltd.
X-12, SBX-17 and MBX-20 are preferred.

Two or more types of solid particles described above may be used in combination. The average particle size is preferably from 1 to 100 μm, more preferably from 2 to 30 μm. The thickness is preferably 0.2 to 30 times, more preferably 0.5 to 20 times, particularly preferably 1 to 15 times the thickness of the image receiving layer. In particular, as the amount of the solid particles is preferably from 0.01 to 0.5 g / m ^2, further preferably 0.02~0.3g / m ^2. This is, given the projected area,
It is preferably from 0.1 to 50%, more preferably from 0.5 to 30%, particularly preferably from 1 to 20%.

Further, the electrophotographic image-receiving material of the present invention is
Of the specular gloss values shown in IS Z8741
Surface gloss Gs (45 °) measured at an incident angle of 45 ° is 4
Preferably, the surface gloss Gs (45 °) is 60 or more even after the toner image is formed.
The organic and / or inorganic fine particles used in the present invention have a refractive index of 0.8 to 3.0, preferably 1.1 to 2.2.
9, particularly preferably 1.3 to 2.6.

The toner image receiving layer receives toner for forming an image from a developing drum or an intermediate transfer member by (static) electricity, pressure, or the like at least in a transfer step, and receives heat,
Includes image-receiving substances that can be fixed by pressure or the like. As the receptive substance, a thermoplastic resin, a water-soluble resin, a pigment having a small particle diameter, or the like is used. The toner image receiving layer preferably has a thickness of at least half the particle diameter of the toner, and more preferably has a thickness of 1 to 3 times the toner particle diameter.
The toner image receiving layer preferably has a thickness disclosed in JP-A-5-216322 and JP-A-7-301939.

The physical properties of the toner image receiving layer preferably satisfy at least one of the following items, more preferably a plurality of items, and most preferably all of the following items. (1) Tg (glass transition temperature) of the image receiving layer is 30 ° C. or more,
(Tg of toner) + 20 ° C. or less. (2) The T1 / 2 (1/2 method softening point) of the image receiving layer is in the range of 60 to 150C, more preferably 80 to 120C. (3) Tfb (outflow starting temperature) of the image receiving layer is 40 to 100
° C, more preferably, Tfb of the image receiving layer is Tfb + of the toner.
It must be 10 ° C or less. (4) The temperature at which the viscosity of the image receiving layer becomes 1 × 10 ⁵ CP is 40.
° C or higher and lower than the temperature at which the viscosity of the toner becomes 1 × 10 ⁵ CP. (5) The storage elastic modulus (G ′) at the fixing temperature of the image receiving layer is 1 × 10 ² Pa to 1 × 10 ⁵ Pa, and the loss elastic modulus (G ″) is 1 × 10 ² Pa to 1 × 10 5 ⁵ it is Pa. (6) loss modulus at a fixing temperature of the image receiving layer (G ") which is the ratio loss tangent and storage modulus (G ') (G" /
G ′) is 0.01 to 10. (7) The storage elastic modulus (G ′) at the fixing temperature of the image receiving layer is smaller than the storage elastic modulus (G ″) at the fixing temperature of the toner.
50 to +2500. (8) The angle of inclination of the molten toner on the image receiving layer is 50 ° or less, preferably 40 ° or less. Further, as the image receiving layer, JP-A-2788358, JP-A-7-2486.
No. 37, JP-A-8-305067, JP-A-1
Those satisfying the physical properties and the like disclosed in 0-239889 and the like are preferable.

The physical properties (1) can be measured by a differential scanning calorimeter (DSC). Also,
The physical properties (2) to (4) can be measured using, for example, a flow tester CFT-500 manufactured by Shimadzu Corporation.
The physical properties (5) to (7) can be measured using a rotary rheometer (for example, a dynamic analyzer RADII manufactured by Rheometric Corporation). (8)
Can be measured by a method described in JP-A-8-334916, using a contact angle measuring device manufactured by Kyowa Interface Chemical Co., Ltd.

The type of the thermoplastic resin used in the electrophotographic image-receiving material of the present invention is not particularly limited as long as it is deformable at the fixing temperature and can accept the toner. Preferably, a resin of the same system as the resin used as the binder of the toner is preferable. Since a polyester resin is often used as a binder for the toner, in that case, it is desirable that the thermoplastic resin used in the electrophotographic image-receiving material of the present invention also use the polyester resin, preferably at least 20% by weight. Further, a styrene-acrylate copolymer, a styrene-methacrylate copolymer, and the like are also preferably used. Hereinafter, a resin preferably used will be described.

As the thermoplastic resin used in the electrophotographic image-receiving material of the present invention, a resin having an ester bond; a polyurethane resin; a polyamide resin, a urea resin, etc .; a polysulfone resin; a polyvinyl chloride resin, a polyvinylidene chloride resin, a vinyl chloride. -Vinyl acetate copolymer resin, vinyl chloride-vinyl propionate copolymer resin; polyol resin such as polyvinyl butyral, ethyl cellulose resin,
Cellulose resins such as cellulose acetate resins, etc .; polycaprolactone resins, styrene-maleic anhydride resins, polyacrylonitrile resins, polyether resins, epoxy resins, phenol resins, etc .; polyolefin resins such as polyethylene resins, polypropylene resins, ethylene and propylene, etc. And an acrylic resin and the like, and a mixture or a copolymer thereof.

Among these thermoplastic resins, a resin having an ester bond is preferable, for example, a polyacrylate resin such as polymethyl acrylate, polybutyl acrylate, polymethyl methacrylate, polybutyl methacrylate or a polymethacrylate resin;
Polyester resin, polycarbonate resin, polyvinyl acetate resin, styrene acrylate resin, styrene-methacrylate copolymer resin, vinyl toluene acrylate resin, and the like can be used.

The above polyester resins include terephthalic acid, isophthalic acid, maleic acid, fumaric acid, phthalic acid,
Polycarboxylic acid components such as adipic acid, sebacic acid, azelaic acid, abietic acid, succinic acid, trimellitic acid, and pyromellitic acid (these dicarboxylic acid components may be substituted with a sulfonic acid group, a carboxyl group, or the like) )When,
Ethylene glycol, diethylene glycol, propylene glycol, bisphenol A, bisphenol A diether derivative (for example, bisphenol A ethylene oxide 2 adduct, bisphenol A propylene oxide 2 adduct, etc.), bisphenol S, 2-ethylcyclohexyldimethanol, neo It is obtained by condensation with an alcohol component such as pentyl glycol, cyclohexyldimethanol and glycerin (these alcohol components may be substituted with a hydroxyl group or the like).

Specific examples of the polyester resin include JP-A-59-101395, JP-A-63-7971, JP-A-63-7972, and JP-A-63-7972.
No. 73 and JP-A-60-294882. Also, commercially available products include Byron 290, Byron 200, and Byron 28 manufactured by Toyobo.
0, Byron 300, Byron 103, Byron GK-
140, Byron GK-130, Kafu-made Tuffton NE
-382, Tufton-5, ATR-2009, ATR-
2010, Unitika ELIETEL UE3500, UE
3210, XA-8153, Polyester TP-220 and R-188 manufactured by Nippon Gohsei can be used.

The thermoplastic resin used in the toner image-receiving layer of the present invention is preferably selected from those which can satisfy the above-mentioned physical properties of the image-receiving layer in a state where the toner image-receiving layer is formed. More preferably, a resin alone can provide favorable physical properties to the toner image receiving layer. It is also preferable to use two or more resins having different physical properties as described above.

As the thermoplastic resin used for the toner image receiving layer, those having a molecular weight larger than that of the thermoplastic resin used for the toner are preferably used. However, depending on the relationship between the thermodynamic properties of the toner resin and the resin of the image receiving layer, the relationship between the above-described molecular weights is not always preferable. For example, when the softening temperature of the image receiving layer resin is higher than that of the toner resin, it may be preferable that the molecular weight is equal or the image receiving layer resin is smaller. As the thermoplastic resin used in the toner image receiving layer, it is also preferable to use a mixture of resins having the same composition and different average molecular weights. The relationship between the molecular weight of the thermoplastic resin used in the toner,
The relationship disclosed in JP-A-8-334915 is preferable. Further, the molecular weight distribution of the thermoplastic resin used for the toner image receiving layer is preferably wider than the molecular weight distribution of the thermoplastic resin used for the toner. Further, as the thermoplastic resin used for the toner image receiving layer, Japanese Patent Publication No.
JP-A-127413, JP-A-8-194394 and JP-A-8-194394
Nos. 334915, 8-334916, 9-171
Those satisfying the physical properties and the like disclosed in, for example, Nos. 265 and 10-221877 are preferably used.

Various additives can be used in the thermoplastic resin-containing layer of the electrophotographic image-receiving material of the present invention for the purpose of improving the thermodynamic properties of the resin layer. Additives for such purposes include plasticizers, organic and inorganic fillers, emulsions, dispersions, crosslinkers, and the like. Known plasticizers for resins can be used as the plasticizer used in the present invention. As used herein, the term “plasticizer” refers to a group of compounds that adjusts the flow or softening of the toner image-receiving layer by heat and / or pressure when fixing the toner. As plasticizers, "Chemical Handbook" (edited by The Chemical Society of Japan, Maruzen), "Plasticizers-Theory and Application-" (edited by Koichi Murai,
Koshobo), “Plasticizer Research Above”, “Plasticizer Research Below”
(Edited by the Society of Polymer Chemistry), “Handbook of Rubber / Plastic Compounds” (edited by Rubber Digest) and the like.

JP-A-59-83154 describes a plasticizer under the name of a high-boiling organic solvent or a hot solvent.
Nos. 59-178451 and 59-178453
Nos. 59-178454 and 59-178455
Nos. 59-178457 and 62-174754
No. 62-245253, No. 61-209444
No. 61-200538, No. 62-8145, No. 62-9348, No. 62-30247, No. 62-1
No. 36646, No. 62-174754, No. 62-24
No. 5253, No. 61-209444, No. 61-200
No. 538, No. 62-8145, No. 62-9348,
Esters such as those described in JP-A-62-30247, JP-A-62-136646, JP-A-2-235694, etc. (for example, phthalates, phosphates, fatty acid esters, abietic acid esters) Kind,
Adipates, sebacates, azelates, benzoates, butyrates, epoxidized fatty acids, glycolates, propionates, trimellites, citrates , Sulfonic acid esters, carboxylic acid esters, succinic acid esters, maleic acid esters, fumaric acid esters, phthalic acid esters, stearic acid esters, etc.), amides (eg, fatty acid amides, sulfoamides, etc.) , Ethers,
Compounds such as alcohols, paraffins, polyolefin waxes (eg, polypropylene waxes, polyethylene waxes, etc.), lactones, polyethyleneoxys, silicone oils, and fluorine compounds can be used.

Further, a polymer having a relatively low molecular weight can be used as a plasticizer. In this case, the molecular weight is preferably lower than that of the resin to be plasticized, particularly preferably 15,000 or less, and particularly preferably 5,000 or less. In the case of a polymer plasticizer, a polymer of the same type as the target resin is preferable. For example, polyester is preferable for plasticizing a polyester resin. Further, oligomers can also be used as plasticizers.

In addition to the compounds listed above, commercial products include
Asahi Denka Kogyo Adekasizer PN-170, PN-14
30, C.I. P. HALL PARAPLEX-G-
25, G-30, G-40, Rika Hercules products Ester gum 8L-JA, Ester R-95, Pentaline 4
851, FK115, 4820, 830, Luizol 2
8-JA, picolastic A75, picotex LC,
Crystallex 3085 and the like.

In the electrophotographic image receiving material of the present invention,
It is preferable to use a plasticizer in at least one of the constituent layers formed on the support. The plasticizer may be micro-dispersed in the layer, may be micro-phase-separated in a sea-island state, or may be sufficiently mixed and dissolved with other components such as a binder. The layer to which the plasticizer is added may be any of a protective layer, an intermediate layer, an undercoat layer, and the like, in addition to the toner image receiving layer, but is preferably a layer to which the stress generated when the toner particles are embedded in the image receiving material is transmitted. Further, a layer through which strain generated by stress (physical strain such as elastic force or viscosity, strain due to material balance of molecules, binder main chain, pendant portion, etc.) is preferably transmitted, and a layer capable of relaxing these stresses and strains It is preferable that the position is. For example, a layer adjacent to the toner image receiving layer, a toner image receiving layer, and a surface layer are preferable.

The added amount of the plasticizer of the present invention is preferably 0.001 to 90% by mass, when the total weight of the resin constituting the layer, other components and the plasticizer is 100% by mass,
0.1-60 mass% is more preferable, and 1-40 mass% is even more preferable. In addition, the plasticizer adjusts the slipperiness (improves the transportability by reducing the frictional force), improves the fixing part offset (peeling off the toner and layer to the fixing part), adjusts the curl balance, and adjusts the charge (toner electrostatic image For example).

As the filler used in the electrophotographic image-receiving material of the present invention, for example, those known as a reinforcing agent, a filler and a reinforcing material for a resin can be used. Fillers can be selected with reference to Handbook of Rubber / Plastic Compounding Chemicals (Rubber Digest Co., Ltd.), "New Edition Plastic Compounding Agent Basics and Applications" (Taiseisha), "Filler Handbook" (Taiseisha), etc. it can. Various inorganic pigments can be used as the filler. As the inorganic pigment, titanium oxide, calcium carbonate, silica, talc, mica, alumina, and other known pigments listed in “Handbook of Rubber / Plastic Compounds” (edited by Rubber Digest Co., Ltd.) and the like can be used.

The crosslinking agent used in the electrophotographic image-receiving material of the present invention includes, for example, two reactive groups such as an epoxy group, an isocyanate group, an aldehyde group, an active halogen group, an active methylene group, an acetylene group and other known reactive groups. As described above, compounds having a molecule can be used. In addition, a compound having two or more groups capable of forming a bond by a hydrogen bond, an ionic bond, a coordination bond, or the like in addition to the group forming a covalent bond described above can also be used. In addition, coupling agents for resins, curing agents, polymerization agents, polymerization accelerators, coagulants,
Known compounds such as a film forming agent and a film forming aid can also be used. Examples of coupling agents include chlorosilanes, vinylsilanes, epoxysilanes, aminosilanes, alkoxyaluminum chelates, titanate coupling agents, etc., and "Handbook Rubber / Plastic Compounding Chemicals" (Rubber Digest) Known ones mentioned in the above can be used.

As the resin for the toner image-receiving layer of the electrophotographic image-receiving material of the present invention, a water-soluble polymer can be used. As the water-soluble polymer, if it is a water-soluble polymer, its composition, bonding structure, molecular structure, molecular weight, molecular weight distribution, and form are not specified. Examples of the water-solubilizing group of the polymer include a hydroxyl group, a carboxylic acid group, an amino group,
Examples thereof include an amide group and an ether group. Examples of water-soluble polymers include Research Disclosure 1
No. 7,643, p. 26, 18,716, p. 651, 3
No. 07,105, pages 873-874 and JP-A 64-
No. 13546, pages (71) to (75). Specifically, for example, vinylpyrrolidone-vinyl acetate copolymer, styrene-vinylpyrrolidone copolymer, styrene-maleic anhydride copolymer, water-soluble polyester, water-soluble polyurethane, water-soluble nylon,
Water-soluble epoxy resins can be used.

Water-dispersible resins such as water-dispersed acrylic resins, water-dispersed polyester resins, water-dispersed polystyrene resins, and water-dispersed urethane resins; acrylic resin emulsions, polyvinyl acetate emulsions, SBR (styrene / butadiene / rubber) emulsions, etc. Emulsion or
Any of these copolymers, mixtures, and aqueous solutions such as those modified with a cation can be appropriately selected and used in combination of two or more. Further, the gelatin may be selected from lime-processed gelatin, acid-processed gelatin, and so-called demineralized gelatin having a reduced content of calcium and the like according to various purposes,
It is also preferable to use them in combination.

When the binder resin of the toner is a polyester resin, it is preferable that the resin of the toner image receiving layer is also a water-dispersed polyester. Commercially available water-dispersed polyesters include, for example, Toyobo Vylonal MD-1
250, MD-1930 or Plus Co. Z
-446, Z-465, RZ-96, E made by Dainippon Ink and Chemicals, Inc.
S-611, ES-670, Pesresin A- made by Takamatsu Yushi
160P, A-210, A-620 and the like. The film forming temperature of the polymer to be used is preferably room temperature or higher for storage before printing, and is preferably 100 ° C. or lower for fixing toner particles.

The toner image receiving layer of the present invention has an average particle size of 3
Solid particles smaller than μm can be used as the toner image receiving material. As solid particles having an average particle size of less than 3 μm,
Inorganic pigments are preferably used. Examples of inorganic pigments include silica pigments, alumina pigments, titanium dioxide pigments, zinc oxide pigments, zirconium oxide pigments, mica iron oxide, lead white, lead oxide pigments, cobalt oxide pigments, strontium chromate, molybdenum pigments, smectite, Includes magnesium oxide pigments, calcium oxide pigments, calcium carbonate pigments and mullite. Silica pigments and alumina pigments are preferred. Two or more types of solid particles may be used in combination.

The silica pigment includes spherical silica and amorphous silica. The silica pigment can be synthesized by a dry method, a wet method, or an airgel method. The surface of the hydrophobic silica particles may be surface-treated with trimethylsilyl groups or silicone. Colloidal silica is particularly preferred. The average particle size of the silica pigment is preferably from 4 to 120 nm,
More preferably, it is 4 to 90 nm. The silica pigment is preferably porous. The average pore size of the porous silica pigment is preferably from 50 to 500 nm.
The average pore volume per weight of the porous silica pigment is 0.1.
It is preferably 5 to 3 ml / g.

The alumina pigment includes anhydrous alumina and alumina hydrate. As the crystal form of anhydrous alumina,
α, β, γ, δ, ζ, η, θ, κ, ρ or χ can be used. Alumina hydrate is preferred over anhydrous alumina. Monohydrate or trihydrate can be used as the alumina hydrate. Monohydrates include pseudoboehmite, boehmite and diaspore. Trihydrate includes gibbsite and bayerite. The average particle size of the alumina pigment is preferably from 4 to 300 nm, more preferably from 4 to 200 nm. The alumina pigment is preferably porous. The average pore size of the porous alumina pigment is preferably from 50 to 500 nm. The average pore volume per weight of the porous alumina pigment is preferably 0.3 to 3 ml / g.

Alumina hydrate can be synthesized by a sol-gel method in which ammonia is added to an aluminum salt solution for precipitation, or a method in which alkali aluminate is hydrolyzed. Anhydrous alumina can be obtained by dehydrating alumina hydrate by heating. The amount of the inorganic pigment to be used is preferably 5 to 2000% by mass in terms of a dry weight ratio to the binder of the layer to be added.

In the toner image receiving layer, various additions can be used in addition to the additives for adjusting the thermodynamic properties of the above-mentioned layer. The image receiving material for electrophotography of the present invention preferably contains a charge control agent for the purpose of adjusting the transfer and adhesion of the toner, and for preventing the charge adhesion of the image receiving material.
As the charge control agent, any of conventionally known antistatic agents and charge control agents can be used, and cationic surfactants,
In addition to surfactants such as anionic surfactants, amphoteric surfactants, and nonionic surfactants, polymer electrolytes, conductive metal oxides, and the like can be used.

For example, 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; fatty acid esters; And the like, but not limited thereto. If the toner has a negative charge,
As the charge control agent, a cation or a nonion is preferable.

As the conductive metal oxide, ZnO, Ti
O ₂ , SnO ₂ , Al ₂ O ₃ , In ₂ O ₃ , SiO ₂ , Mg
O, BaO and MoO ₃ can be mentioned. These may be used alone or a composite oxide of these may be used. Further, the metal oxide may further contain a different element, for example, Al, In with respect to ZnO.
Contains Nb, Ta, etc. for TiO ₂ , Sb, Nb, halogen element, etc. for SnO ₂ (doping)
Can be done.

The toner image receiving layer and other layers according to the present invention have a range of 1 × 10 ⁶ to 1 × 10 ¹⁵ (25 ° C., 65% R
Under the condition of H). If it is less than 1 × 10 ⁶ Ω, low density of the toner image to the toner amount is obtained it is not sufficient when the toner is transferred to the image receiving layer, on the other hand, if it exceeds 1 × 10 ¹⁵ Ω is required at the time of transfer The above-mentioned charges are generated, the toner is not sufficiently transferred, and the density of the image decreases. It is not preferable because dust is easily attached due to static electricity during the handling of the electrophotographic image receiving material, and misfeeding, double feeding, discharge marks, toner transfer dropping and the like are liable to occur during copying.

The range of the optimum surface electric resistance of the transparent resin layer is as follows.
In the range of 10 ¹⁰ to 10 ¹³ Ω / cm ² , preferably 5 × 10
The range is from ^{10 to} 5 × 10 ¹² Ω / cm ² , and the amount of the antistatic agent used is adjusted accordingly. The surface electric resistance of the surface opposite to the image receiving layer with respect to the support is 5 × 10 ^{8 to} 3.2 ×.
10 ¹⁰ Ω / cm ² range, preferably 1 × 10 ⁹ to 1 ×
A range of 10 ¹⁰ Ω / cm ² is suitable. The surface electric resistance was measured in accordance with JIS K 6911. The sample was conditioned for 8 hours or more in an environment of a temperature of 20 ° C. and a humidity of 65%, and applied under the same environment using R8340 manufactured by Advantest Corporation. It is obtained by measuring after a lapse of one minute from energization under the condition of a voltage of 100 V.

The image receiving material for electrophotography of the present invention has an image quality,
Especially for the purpose of improving whiteness, fluorescent brightener, white pigment,
Colored pigments, dyes, and the like can be used. As the fluorescent whitening agent, a compound that absorbs near-ultraviolet light and emits fluorescence at 400 to 500 nm can be used. As the fluorescent whitening agent used in the present invention, K. VeenRa
"The Chemistry of Synthetic Dyes", Vol. 8
The compounds described in the chapter can be mentioned. More specifically, stilbene compounds, coumarin compounds,
Biphenyl compounds, benzoxazoline compounds, naphthalimide compounds, pyrazoline compounds, carbostyril compounds and the like can be mentioned. Examples of these are white full fur PSN, PHR, H
CS, PCS, B, UVA manufactured by Ciba-Geigy
EX-OB and the like.

As the white pigment, the inorganic pigments (titanium oxide, calcium carbonate, etc.) described in the section of the filler and the section of the pigment having a fine particle diameter can be used. Examples of colored pigments include various pigments and azo pigments described in JP-A-63-44653 (Azo lake; Carmine 6B, Red 2B, insoluble azo; Monoazo yellow, disazo yellow,
Pyrazolo orange, Vulcan orange, Condensed azo type; Chromophthaluiero, Chromophthal red), Polycyclic pigment (Phthalocyanine type; Copper phthalocyanine blue, Copper phthalocyanine green, Cyoxazine type; Dioxazine violet, Isoindolinone type; Isoindone) Linone yellow, sulene; perylene, perinone, flavanthrone, thioindigo, lake pigment (malachite green,
Rhodamine B, Rhodamine G, Victoria Blue B),
Inorganic pigments (oxides, titanium dioxide, red iron oxide, sulfates;
Precipitated barium sulfate, carbonate; precipitated calcium carbonate,
Silicate; hydrous silicate, anhydrous silicate, metal powder; aluminum powder, bronze powder, zinc dust, carbon black, graphite,
Navy blue).

As the dye, various known dyes can be used. Examples of the oil-soluble dye include anthraquinone compounds and azo compounds. Specific examples of the water-insoluble dye include C.I. I. Vat Violet 1,
C. I. Vat Violet 2, C.I. I. Vat Violet 9, C.I. I. Vat Violet 13,
C. 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. Disperse 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; I. Solvent Violet 13, C.I. I. Solvent Violet 14, C.I. I. Solvent Violet 2
1, C.I. I. Solvent Violet 27, C.I. I.
Solvent Blue 11, C.I. I. Solvent Blue 1
2, C.I. I. Solvent Blue 25, C.I. I. An oil-soluble dye such as Solvent Blue 55 can be used. Further, colored couplers used in silver halide photography can also be preferably used.

The toner image forming surface of the electrophotographic image receiving material of the present invention preferably has a high whiteness. The whiteness is preferably such that the L ^* value in the CIE 1976 (L ^* a ^* b ^* ) color space is 80 or more, more preferably 85 or more, even more preferably 90 or more. Further, it is preferable that the white color is as neutral as possible. The white color is (a ^* ) ² + in L ^* a ^* b ^* space.
The value of (b ^* ) ² is preferably 50 or less, more preferably 18 or less, and even more preferably 5 or less.

Further, it is preferable that the toner image forming surface of the electrophotographic image receiving material of the present invention has higher gloss. As for the glossiness, the 45-degree glossiness is preferably 60 or more, more preferably 75 or more, even more preferably 90 in the entire region from white without toner to black with the maximum density.
That is all. However, the glossiness is preferably 110 or less. If it exceeds 110, it becomes metallic luster, which is not preferable as image quality. The gloss is JIS Z8741
Can be measured based on

It is preferable that the toner image forming surface of the electrophotographic image receiving material of the present invention has high smoothness. As for the smoothness, the arithmetic average roughness (Ra) is preferably 3 μm or less, more preferably 1 μm or less, further preferably 0.5 μm or less in the entire region from white without toner to black with the maximum density. . The arithmetic mean roughness is J
It can be measured based on IS B 0601, B 0651, B 0652.

The electrophotographic image-receiving material of the present invention has surface protection, improved storage stability, improved handleability, imparted writability,
A protective layer can be provided on the surface of the toner image receiving layer for the purpose of improving the device passage property, imparting an anti-offset property, and the like.
The protective layer may be a single layer or may be composed of two or more layers. For the protective layer, various thermoplastic resins, thermosetting resins, water-soluble polymers, and the like can be used as binders. Preferably, the same type as the toner image receiving layer is used. However, thermodynamic characteristics, electrostatic characteristics, and the like do not need to be the same as those of the toner image receiving layer, and are optimized respectively. For the protective layer, any of the additives that can be used in the toner image receiving layer can be used. Especially for the protective layer,
A charge controlling agent, a matting agent, a slipping agent, a release agent and the like are preferably used. The following examples of additives can be used for other than the protective layer.

Re-surface layer of electrophotographic image-receiving material of the present invention
It is preferable that the compatibility of the toner (for example, the surface protective layer) with the toner is good from the viewpoint of fixability. Specifically, the contact angle with the molten toner is preferably 40 degrees or less and 0 degrees or more.

It is preferable that the electrophotographic image receiving material of the present invention does not adhere to a fixing heating member at the time of fixing. for that reason,
The 180 degree peel strength at the fixing temperature with the fixing member is:
0.1 N / 25 mm or less, preferably 0.0 N / 25 mm or less.
More preferably, it is 41 N / 25 mm or less. 18
For the 0 degree peel strength, JIS K
It can be measured according to the method described in US Pat. As the slipping agent used in the electrophotographic image receiving material of the present invention, various known materials can be used. Examples of the slip agent include higher alkyl sodium sulfate, higher fatty acid higher alcohol ester, carbowax, higher alkyl phosphate, silicone compound, modified silicone, curable silicone, and the like. Further, polyolefin wax, fluorine-based oil, fluorine-based wax, carbana wax, microcrystalline wax, and silane compound are also preferably used.

As for the slipping agent which can be used in the present invention, US Pat. No. 2,882,157 and Patent No. 31
No. 21060, Patent No. 3850640,
French Patent No. 2180465, British Patent No. 9
No.55061, Japanese Patent No. 1143118,
Japanese Patent No. 1263722, Patent No. 1270578
Specification, Japanese Patent No. 1320564, Japanese Patent No. 13
No. 20575, Patent No. 2588765,
Japanese Patent No. 2739891, Japanese Patent No. 3018178
No., Japanese Patent No. 3042522, Japanese Patent No. 30
No. 80317, Japanese Patent No. 308087,
Japanese Patent No. 312160, Patent No. 3222178
Specification, Japanese Patent No. 3295997, Patent No. 34
No. 89567, Patent No. 3516832,
Patent No. 3658573, Patent No. 3679411
No., Japanese Patent No. 3870521, Japanese Unexamined Patent Publication No.
Nos. 5017, 51-141623 and 5
4-159221, 56-81841,
And RD13969.

The amount of the slip agent used is 5 to 500 mg / m ^2.
It is preferred that More preferably 10 to 200 m
g / m ² . Since the wax-based slip agent hardly dissolves in an organic solvent, it is preferable to prepare an aqueous dispersion and prepare and apply a dispersion with a thermoplastic resin solution. In this case, the wax-based slip agent is present in the thermoplastic resin in the form of fine particles. In this case, the amount of the slip agent used is 5 to 10,000 mg.
/ M ² . More preferably 50 to 5
000 mg / m ² .

The electrophotographic image-receiving material of the present invention includes a backside output suitability, a backside output image quality improvement, a curl balance improvement, and the like.
A back layer can be provided on the side of the support opposite to the above-mentioned toner image receiving layer for the purpose of, for example, improving the device passage property. The back layer may have the same structure as that of the toner image receiving layer side in order to improve the suitability for double-sided output. The above-mentioned additives can be used for the back layer. In particular, it is preferable to use the above-mentioned matting agent, slip agent, charge control agent and the like. Back layer is 1
It may be composed of layers, or may be composed of two or more layers. Further, when a releasing oil is used for a fixing roller or the like to prevent offset at the time of fixing, it is preferable to make the back surface have oil absorbency.

The image-receiving material for electrophotography of the present invention has the following properties in order to improve the adhesion between the support and the toner image-receiving layer and other layers.
An adhesion improving layer can be provided. The aforementioned additives can be used in the adhesion improving layer. In particular, it is preferable to use the above-mentioned crosslinking agent. Further, the image receiving material for electrophotography of the present invention may be provided with a cushion layer in order to improve the receptivity of the toner. Further, the electrophotographic image-receiving material of the present invention may have an intermediate layer in addition to the above-mentioned various layers.

Various additives can be used in the electrophotographic image-receiving material of the present invention to improve the stability of an output image and the stability of the image-receiving layer itself. As the additives for this purpose, various known antioxidants, antioxidants, deterioration inhibitors, ozone deterioration inhibitors, ultraviolet absorbers, light stabilizers, preservatives, fungicides and the like are used. Antioxidants include chroman compounds, coumaran compounds, phenol compounds (eg, hindered phenols), hydroquinone derivatives, hindered amine derivatives, and spiroindane compounds. Regarding antioxidants, see JP-A-61-1.
No. 59644. In addition, as an anti-aging agent, "Handbook Rubber / Plastic Compound Chemicals Revision 2
Edition "(1993, Rubber Digest) p.76-121
Described in (1).

Examples of ultraviolet absorbers include benzotriazole compounds (described in US Pat. No. 3,533,794),
4-thiazolidone compounds (described in U.S. Pat. No. 3,352,681) and benzophenone compounds (JP-A-46-2)
784) and an ultraviolet absorbing polymer (Japanese Unexamined Patent Publication No.
2-260152). Regarding metal complexes, U.S. Pat. Nos. 4,241,155, 4,245,018, 4,254,195, JP-A-61-88256, and 62-1747.
No. 41, 63-199248, JP-A-1-
75568 and 1-74272. In addition, "Handbook Rubber and Plastic Compounding Chemicals Revised 2nd Edition" (1993, Rubber Digest) p1
The ultraviolet absorbers and light stabilizers described in 22 to 137 are also preferably used.

As the electrophotographic image-receiving material of the present invention, other known photographic additives can be used.
For example, RD17643 (19)
RD18716 (November 1979)
Mon.) and RD307105 (November 1989), and the relevant portions are summarized below.

[0069]

[Table 1]

The shape of the electrophotographic image-receiving material is not particularly limited as long as it can be used for recording by an electrophotographic method. It may be in the form of a sheet or a band, or may be in the form of a long roll. From the viewpoint of printing efficiency, a roll-shaped long winding is preferable. In the case of a long roll, it is preferable to cut the final product inside the printer, and it is preferable to use a printer having that function. Other specific examples of the electrophotographic image-receiving material of the present invention include L-size and 2L-size photographic prints, photographs and nouns with pictures, tickets, calendars, photo prints with decorative borders, seal prints, and the like. Both are suitable. Further, when the electrophotographic image-receiving material of the present invention is used, a print having no blank portion which is not printed on the edge can be produced by an electrophotographic printing method. In addition, these small-size prints can be supplied in the form of perforated large-size sheets.

The toner used for forming an image on the electrophotographic image-receiving material of the present invention is not particularly limited as long as it is a toner used in a usual electrophotographic method. The toner used for electrophotography generally comprises a colorant and a binder resin as main components. As the colorant to be contained in the binder resin, any known colorant can be used.
For example, carbon black, aniline blue, calcoil blue, chrome yellow, ultramarine blue, Dupont oil red, quinoline yellow, methylene blue chloride, phthalocyanine blue, malachite green oxalate, lamp black, rose bengal,
C. I. Pigment Red 48: 1, C.I. I. Pigment Red 122, C.I. I. Pigment Red 5
7: 1, C.I. I. Pigment Yellow 97, C.I. I.
Pigment Yellow 12, C.I. I. Pigment Yellow 17, C.I. I. Pigment Blue 15: 1, C.I.
I. Pigment Blue 15: 3 can be exemplified as a typical example. The content of the colorant is preferably in the range of 2 to 8% by weight. When the content of the colorant is less than 2% by weight, the coloring power is weakened, and when the content is more than 8% by weight, the transparency of the color toner is deteriorated.

Examples of the binder resin used in the present invention include styrenes such as styrene and chlorostyrene, monoolefins such as ethylene, propylene, butylene and isoprene, vinyl acetate, vinyl propionate, vinyl benzoate and vinyl butyrate. Vinyl esters, methyl acrylate, ethyl acrylate, butyl acrylate, dodecyl acrylate, octyl acrylate, phenyl acrylate,
Α-methylene aliphatic monocarboxylic esters such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, dodecyl methacrylate, vinyl methyl ether,
Examples thereof include homopolymers and copolymers such as vinyl ethers such as vinyl ethyl ether and vinyl butyl ether, and vinyl ketones such as vinyl methyl ketone, vinyl hexyl ketone, and vinyl isopropenyl ketone. Particularly typical binder resins include polystyrene resin, polyester resin, styrene-alkyl acrylate copolymer, styrene-alkyl methacrylate copolymer,
Styrene-acrylonitrile copolymer, styrene-butadiene copolymer, styrene-maleic anhydride copolymer,
Examples include polyethylene resin and polypropylene resin. Furthermore, polyurethane resin, epoxy resin, silicone resin, polyamide resin, modified rosin, paraffins, waxes and the like can be mentioned. Among these resins, it is particularly preferable to use the same polyester resin as that used for the toner image-receiving layer in the electrophotographic image-receiving material.

The binder resin used in the present invention preferably has the same physical properties as those of the resin used for the toner image-receiving layer in the electrophotographic image-receiving material described above, but the relationship with the resin properties of the image-receiving layer is as described above. It is. The binder resin used in the present invention has an angular frequency of 10 rad / sec at 150 ° C.
Those having a storage elastic modulus of 10 to 300 Pa measured in c are preferable. The binder resin used in the present invention is disclosed in
It preferably has a sharp melt property as disclosed in, for example, JP-A-305067.

The toner of the present invention comprises the above colorant and the binder resin as main components, and those having an average particle diameter in the range of 3 to 15 μm, particularly 4 to 8 μm are preferably used. You. Further, the storage elastic modulus G ′ (measured at an angular frequency of 10 rad / sec) at 150 ° C. of the toner itself is preferably in the range of 10 to 200 Pa.

Further, an external additive may be added to the toner of the present invention. As the external additive, inorganic compound fine powder and organic compound fine particles are used. The inorganic compound fine particles are SiO ₂ , TiO ₂ , Al ₂ O ₃ , CuO, Zn
O, SnO ₂ , Fe ₂ O ₃ , MgO, BaO, CaO,
K ₂ O, Na ₂ O, ZrO ₂ , CaO · SiO ₂ , K ₂
O. (TiO ₂ ) n, Al ₂ O ₃ .2SiO ₂ , CaC
O ₃ , MgCO ₃ , BaSO ₄ , MgSO _{4 and the} like can be exemplified. In addition, as the organic compound fine particles, fine powders of fatty acids or derivatives thereof, metal salts thereof, and the like, and fine resin powders such as fluororesins, polyethylene resins, and acrylic resins can be used.

The method for forming an image on the electrophotographic image receiving material of the present invention is not particularly limited. Any ordinary electrophotographic method can be applied. For example, a color image can be preferably formed on the electrophotographic image receiving material of the present invention. The formation of a color image can be performed using an electrophotographic apparatus capable of forming a full-color image as shown in FIG. 1, for example. The electrophotographic apparatus shown in FIG. 1 includes an image receiving material transport system provided at a lower side of the apparatus main body, a toner image intermediate transfer section at a central portion of the apparatus main body, and a toner image intermediate transfer section provided above the image transfer section. Latent image forming section, and a developing section disposed close to the latent image forming section. In addition to this, any commonly used electrophotographic apparatus can be applied to the present invention.

[0077]

The present invention will be described more specifically with reference to the following examples and test examples. Materials, reagents, ratios, operations, and the like shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the following specific examples.

(Examples 1 to 21, Comparative Examples 1 to 4) <Image-receiving material for electrophotography using support A>
μm high quality paper (LBKP / NBSP = 6/4, density 1.
053 g / cm ³ ), a medium-density polyethylene (density 0.939 g / cm ³ , melting point 120
C.) and a surface subbing layer of gelatin having a thickness of 0.1 μm was formed thereon. On the opposite side of the pulp layer, low-density polyethylene (density 0.918 g / cm ³ , melting point 107
C)), and a 25 μm-thick backside polyethylene layer made of polyester resin (Vylonal M) is further formed thereon.
A back layer having a thickness of 1.2 μm and comprising 90 parts by weight of D-1930 (manufactured by Toyobo) and 50 parts by weight of a matting agent (Eposter L15, manufactured by Nippon Shokubai) was formed.

After the polyethylene layers on the front and back surfaces of the support thus prepared were subjected to corona discharge treatment, the following undercoat layer composition was dried on the surface so that the thickness after drying was 0.1 μm. An undercoat layer is provided by applying and drying, and the back layer composition described below is applied to the back surface with a wire coater so that the concentration after drying is 1.0 g / m ² .
It dried and provided the back layer, and it was set as the support body A. Support A
Was subjected to corona discharge treatment on the undercoat layer on the surface polyethylene layer, and the following composition for an image receiving layer was applied by a wire coater and dried. Example 1 was changed by changing the kind and amount of the matting agent contained in the composition for the receiving layer as described in Table 2.
~ 3, 5 ~ 8, 10 ~ 17 and Comparative Examples 18 ~ 19, 21
~ 22 electrophotographic image-receiving materials were prepared.

<< Composition for Undercoat Layer >> 5 parts by weight of gelatin 95 parts by weight of water << composition for back layer >> 90 parts by weight of polyester resin (Vylonal MD-1930, manufactured by Toyobo) Matting agent (Eposter L15, Nippon Shokubai) 50 parts by weight Water 10000 parts by weight << Composition for image receiving layer >> 100 parts by weight of polyester resin (Tuffton U-5, manufactured by Kao) Matting agent (type shown in Table 2) Listed in Table 2 15 parts by weight Titanium dioxide (Taipek ^R A-220, manufactured by Ishihara Sangyo) 400 parts by weight methyl ethyl ketone

<Image receiving material for electrophotography using support B>
A commercially available mirror coat platinum (manufactured by Oji Paper) was used as the support B. On one surface of the support B, the above-mentioned composition for an image receiving layer was applied by a wire coater and dried so that the thickness after drying was 15 μm. The types and amounts of the matting agents contained in the receiving layer composition were changed as shown in Table 2, and electrophotographic image receiving materials of Examples 4 and 9 and Comparative Example 20 were produced.

<Print Test> The prepared electrophotographic image-receiving material was cut into A4 pieces, set in a color laser printer (Docucolor DC-1250CP, manufactured by Fuji Xerox), and an image from a computer was printed.
The image is white, gray (R = G = B = 50% of the image), black,
Printed four types of female portraits. For the image receiving material before printing, the surface gloss Gs (45 °) at an incident angle of 45 ° was measured according to JIS Z8741. When the surface gloss Gs (45 °) showed a value of 40 or more, it was evaluated as ○, and when it showed a value less than 40, it was evaluated as x. Before and after printing the white, gray, and black images, the surface gloss Gs (45 °) was measured at the same position to check the difference. For each image, the case where the difference in surface glossiness was 15 or less was evaluated as ○, the case where it was 30 or less as Δ, and the case where it exceeded 30 as x.

The white, gray, and black image surfaces of the printed product, the image-receiving layer (glossy) surfaces of the unprinted product, the image-receiving layer (glossy) surface and the back surface of the unprinted product are overlapped, and the weight is 80 g.
When a load of f / cm ² was applied and one week had passed at 30 ° C. and a relative humidity of 20%, missing and blocking of the surface were confirmed. The case where dropout or blocking occurred was evaluated as x, and the case where no failure occurred was evaluated as ○. In addition, a portrait image of a woman is printed, and when 25 or more of the 30 persons are judged to be photographically preferable, ○ is indicated when 20 or more persons are judged preferable, and when less than 20 persons are judged to be preferable. ×
The image quality was evaluated. Table 2 summarizes the results of these tests. In the examples of the present invention, roughness and chipping were all good, and brittleness was also good. In addition, after printing once, it was possible to print again on the back surface.

[0084]

[Table 2]

Further, a commercially available color laser printer,
Specifically, Fuji Xerox's full-color laser printer (A color 629, color laser window CLW-3
320PS), Xerox color Copiers (DocuColor 57
50), LP-8000C manufactured by Seiko Epson, COLOR PAGEPRESTO N4-ST manufactured by Casio Electronics, COLOR LASER manufactured by Canon
SHOT LBP-2030, made by QMS Japan mag
icolor 2, Konica Color LaserBit KL-2010, Sharp JX-8200, Hitachi BEAMSTAR-RW, Minolta
When printing with Color Page Pro PS,
The same results as in Table 2 were obtained.

[0086]

According to the present invention, it is possible to provide an electrophotographic image receiving material which is excellent in smoothness (gloss), can be used for photographic use, and does not cause adhesion or blocking during storage.

Claims (3)

[Claims] 1. An electrophotographic image-receiving material having a toner image-receiving layer containing a thermoplastic resin on a support, wherein at least one of the layers constituting the electrophotographic image-receiving material on which the toner image-receiving layer is provided is organic and And / or contains one or more inorganic fine particles, and has an incident angle of 4 according to JIS Z8741.
An image receiving material for electrophotography, wherein the surface gloss Gs (45 °) measured at 5 ° is 40 or more. 2. The organic and / or inorganic fine particles having a refractive index of 0.8 to 3.0.
The image receiving material for electrophotography according to the above. 3. JIS Z after forming a toner image
Surface gloss G measured at an incident angle of 45 degrees according to G.8741
3. The electrophotographic image-receiving material according to claim 1, wherein s (45 °) is 60 or more.