JP4600271B2 - Electrophotographic transfer paper and image forming method - Google Patents

Description

  The present invention is an indirect dry electrophotography that has high gloss on the white paper portion, high absorbability of the wax blended in the toner, can prevent transfer by the wax during double-sided printing, contamination of the transport roll, and provide a high-quality image. The present invention relates to an electrophotographic transfer paper having a coating layer and an image forming method used in a full-color copying machine and printer.

  In recent years, indirect dry electrophotographic full-color copying machines and printers have been improved in speed, image quality, and reliability. In the fixing unit, the conventional oil has been provided with the releasability by adhering to the fixing unit, but recently, wax is added to the toner from the viewpoint of reliability and the releasability is provided by the wax. Is moving in the direction.

  In addition, in the field of on-demand publications, with the increase in image quality, it is possible to handle small copies more easily. The movement to gain is remarkable. Therefore, for color copiers and color printers, instead of the PPC paper and printer paper that have been conventionally used, coated paper having a high white paper gloss that has been used in the field of commercial printing can be obtained. Due to the vividness of images, cases used in color copiers and color printers are increasing.

  However, when a large amount of coated paper for commercial printing is used in full-color copiers and printers using toner containing wax, the toner is transferred and fixed on the first side, and then transferred to the opposite side, especially during double-sided printing. When entering the fixing process, the wax exuded from the toner is present on the surface of the image area, and the paper temperature is not sufficiently lowered, so that the molten wax adheres to and accumulates on the transfer member or the transport roll. Problems such as transfer failure and conveyance failure occur. In particular, the coated paper has a smoother surface and fewer recesses than plain paper, so the amount of toner that appears on the surface after fixing is large, and the image area is smoothed further in areas where the toner density is high. Both the member and the conveying member have high adhesion, and the amount of wax transfer increases.

  Conventional systems that use oil in the fixing unit have been improved due to poor transfer due to oil contamination on the transfer member and transport member, the occurrence of transport failure, tape adhesion deterioration, and writability deterioration. ing. For example, a method has been studied in which a pigment size press is applied to the paper surface so that oil can be easily absorbed by a pigment size-pressed on the surface of a high-quality paper-based paper. (For example, patent document 1) Moreover, improving the oil absorbency by giving the image receiving layer which is formed with a porous body and whose oil absorptivity is 1 microliter / A4 or more is examined. (For example, Patent Document 2) It seems that these attempts can be effective in a system using a low-viscosity oil. However, in a system using a toner containing a wax, the wax has a high viscosity so that the wax is fixed after fixing. Cannot be sufficiently absorbed, and it seems difficult to prevent contamination of the conveying member and the transfer member.

Japanese Patent Laid-Open No. 11-174718 JP 2000-347438 A

  An object of the present invention is to solve the above problems. That is, according to the present invention, since the gloss of the white paper portion is high and the wax absorbs well in the system using the toner mixed with the wax, the transfer member and the transport member are prevented from being contaminated at the time of double-sided printing. It is an object of the present invention to provide an electrophotographic transfer sheet having a coating layer used in an indirect dry electrophotographic full-color copying machine and a printer that hardly cause a conveyance failure.

As a result of intensive studies, the present inventors have found that a coated paper having a coating layer mainly composed of a pigment and an adhesive on both surfaces of a substrate, the coating layer having a BET specific surface area of 35. It has been found that the above-mentioned problems can be solved by including a pigment of ˜300 m ² / g and the thermal conductivity of the coated paper is 0.04 to 0.1 W / m · ° C., thereby completing the present invention. .

  That is, the present invention provides the following.

<1> A coated paper having a coating layer mainly composed of a pigment and an adhesive on both surfaces of the substrate, the coating layer containing a pigment having a BET specific surface area of 35 to 300 m ² / g, and coated paper of the thermal conductivity of Ri 0.04~0.1 W / m · ℃ der, and the density of the coated paper is 1.05 g / cm ³ or more, Ru 1.35 g / cm ³ der below An electrophotographic transfer paper characterized by the above.

<2> A coated paper having a coating layer mainly composed of a pigment and an adhesive on both surfaces of the substrate, and the basis weight of the coated paper is 40 g / m ^{2 to} 100 g / m ² or less, <1> The electrophotographic transfer paper according to <1>, wherein a pigment having a BET specific surface area of 35 to 300 m ² / g is contained in an amount of 5 to 50% by weight based on the coating layer coating amount.

<3> The electrophotographic transfer paper according to <1> or <2>, wherein the glossiness at 75 ° of the white paper portion is 40% to 70%.

<4> a step of forming a latent image on a latent image carrier, a step of developing the latent image using an electrophotographic developer, a step of transferring the developed toner image to a transfer medium by a transfer member, A method of forming an image, comprising: a fixing step of heat-pressing a toner image on a transferred material, wherein the toner contains a wax, wherein the transferred material is <1>, <2>, or <3 An image forming method, which is an electrophotographic transfer sheet as described in <1>.

  According to the present invention, since the gloss of the white paper portion is high and the wax absorbs well in the system using the toner mixed with the wax, the transfer member and the conveying member are not contaminated at the time of double-sided printing, and the transfer defect due to the wax is prevented. In addition, it is possible to provide an electrophotographic transfer sheet that hardly causes poor conveyance.

  Hereinafter, the present invention will be described in detail.

The coated paper of the present invention contains a pigment having a BET specific surface area of 35 to 300 m ² / g in the coated layer, and the coated paper has a thermal conductivity of 0.04 to 0.1 W / m · ° C. It is a feature.

  In the present invention, the inventors diligently studied from the viewpoint of coated paper how wax in the toner transferred and fixed on the coated paper does not contaminate the transfer member and the conveying member. As a result, it was found that it was related to the BET specific surface area of the pigment blended in the coating layer and the thermal conductivity of the coated paper. If a pigment with a high BET specific surface area is added to the coating layer, the absorbency of the wax is expected to increase. However, even if the BET specific surface area is increased beyond a certain level, the contamination on the transfer member and the conveying member is improved by a certain level. Turned out not to be. Furthermore, it was confirmed that the contamination of the transfer member and the conveying member cannot be improved more than a certain degree only by blending a pigment having a high BET specific surface area into the coating layer. As a result of further investigation on the thermal conductivity of the coated paper, in addition to blending a pigment having a high BET specific surface area, it is possible to prevent contamination of the transfer member and the conveying member by increasing the thermal conductivity of the coated paper. It was confirmed that poor running performance is unlikely to occur. It is presumed that by increasing the thermal conductivity of the coated paper, the paper surface temperature of the coated paper at the time of fixing was increased, and as a result, the melt viscosity of the wax was lowered and the absorbability to the pigment was increased.

In the present invention, it is important to blend a pigment having a BET specific surface area of 35 to 300 m ² / g in the coating layer. In ordinary commercial coated paper, the pigment used for the coating layer has a BET specific surface area of 20 m ² / g or less, so that the wax absorbability is poor. In order to increase the absorbability of the wax, it is necessary to add a pigment having a BET specific surface area of 35 to 300 m ² / g, preferably 35 to 220 m ² / g, more preferably 70 to 150 m ² / g in the coating layer. is there. When the BET specific surface area is lower than 35 m ² / g, the wax absorbability is not sufficient and the transfer member and the conveying member are contaminated, which is not preferable. On the other hand, if the BET specific surface area exceeds 300 m ² / g, the strength of the coating layer decreases, which is not preferable.

Moreover, it is preferable that it is 5 to 30 weight% with respect to the coating layer coating amount as a compounding quantity of the pigment whose BET specific surface area is 35 to 300 m < ² > / g. More preferably, it is 10 weight%-25 weight%. If the blending amount is less than 5% by weight, it is not preferable because the transfer member and the conveying member are contaminated. On the other hand, if it exceeds 30% by weight, the coating layer strength is undesirably lowered.

Examples of the pigment having a BET specific surface area of 35 to 300 m ² / g include talc, calcium carbonate, titanium oxide, silica, zinc oxide, magnesium carbonate, and magnesium hydroxide.

  Furthermore, the present invention requires that the thermal conductivity of the coated paper be 0.04 to 0.1 W / m · ° C. in order to increase the absorbability of wax. The thermal conductivity of the coated paper is preferably 0.04 to 0.1 W / m · ° C., more preferably 0.05 to 0.09 W / m · ° C. If the thermal conductivity is less than 0.04 W / m · ° C., it is not preferable because the transfer member and the conveying member are contaminated. In addition, if the thermal conductivity of the coated paper exceeds 0.1 W / m · ° C., the paper temperature at the time of fixing becomes high, and a blistering phenomenon (blister) of the coated paper tends to occur.

  As means for increasing the thermal conductivity of the coated paper, a method of increasing the density of the coated paper, a method of blending synthetic fibers having a high thermal conductivity in the base material, and a method of increasing the filler blending amount in the base material , A method of blending a metal powder having a high thermal conductivity into a substrate, a method of blending a metal powder having a high thermal conductivity into a coating layer, and a method of mixing a pigment having a small particle diameter with the pigment in the coating layer Etc.

In the present invention, the density of the coated paper is preferably 1.05 g / cm ³ or more in order to increase the thermal conductivity. More preferred coating density of the paper is at 1.10 g / cm ³ or more, more preferably paper density is at 1.15 g / cm ³ or more and 1.35 g / cm ³ or less. If the density of the coated paper exceeds 1.35 g / cm ³ , the paper temperature at the time of fixing becomes high, and the coated paper tends to cause a blistering phenomenon (blister), and the paper is not scraped. This is not preferable because troubles due to winding at the fixing portion are likely to occur.

  Various fibers are used as fibers used for the base material of the coated paper of the present invention. The fibers used are not particularly limited, but pulp fibers used for base paper of ordinary general coated paper, for example, kraft pulp fibers, sulfite pulp fibers, semi-chemical pulp fibers, chemiground pulp fibers It is preferable to use crushed wood pulp fiber, refiner ground pulp fiber, thermomechanical pulp fiber, etc. in consideration of price. Moreover, the fiber which chemically modified the cellulose or hemicellulose in these fibers can also be used as needed. Furthermore, cotton pulp fiber, hemp pulp fiber, kenaf pulp fiber, viscose rayon fiber, copper ammonia rayon fiber, cellulose acetate fiber, polyvinyl chloride fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber, polyvinylidene chloride fiber, polyurethane Fiber, polyvinyl chloride, polyvinyl alcohol copolymer, fluorocarbon fiber, glass fiber, carbon fiber, aramid fiber, alumina fiber, metal fiber, silicon carbide fiber, polyethylene fiber, polypropylene fiber, polyester fiber alone or in combination Can be used. Furthermore, considering environmental problems in recent years, it is desirable to add high-quality and medium-quality waste paper pulp, and the blending amount is determined according to the use, but it is 10% or more, preferably 30% or more in the total fiber. More preferably, it is 50% or more.

  In order to increase the thermal conductivity, synthetic fibers such as aramid fibers, polyethylene fibers, polypropylene fibers, polyester fibers, polyvinyl alcohol fibers, and polyvinylidene chloride fibers are preferable.

  The blending amount of the synthetic fiber is preferably 5% by weight to 30% by weight.

  Fillers in the base material include heavy calcium carbonate, light calcium carbonate, kaolin, calcined clay, pyroferrite, sericite, talc and other inorganic fillers such as titanium dioxide and thermal conductivity. In order to increase the content, the content is preferably 10 to 30% by weight, and more preferably 20 to 30% by weight.

Furthermore, thermal conductivity can be improved by mix | blending metal powder and metal oxide with high electroconductivity in a base material and a coating layer. Examples of the metal powder include zinc, copper, iron, nickel, chromium titanium, and aluminum. Examples of the metal oxide include TiO ₂ , SnO ₂ , Sb ₂ O ₃ , ZnO, and MgO. In particular, it is easy to obtain an effect of absorbing wax and preventing contamination of the transfer member and the conveying member by blending highly conductive metal powder in the coating layer. However, if it is contained in a large amount, transfer defects are liable to occur during toner transfer, which is not preferable. It is preferable to add 5 wt% to 20 wt% with respect to the coating amount of the coating layer. Furthermore, it is preferable to mix 7 to 15% by weight.

  When blending highly conductive metal powder in the substrate, it is preferable to blend 5 wt% to 20 wt% with respect to the substrate. If it is added in the same amount as in the coating layer, a transferability problem occurs, which is not preferable.

  Examples of the pigment used in the coating layer of the coated paper of the present invention include pigments used in ordinary general coated paper, such as heavy calcium carbonate, light calcium carbonate, titanium dioxide, aluminum hydroxide, satin white, talc. , Calcium sulfate, barium sulfate, zinc oxide, magnesium oxide, magnesium carbonate, amorphous silica, colloidal silica, white carbon, kaolin, calcined kaolin, delaminated clay, aluminosilicate, sericite, bentonite, smectite, etc. Pigments, polystyrene resin fine particles, urea formaldehyde resin fine particles, fine hollow particles, and other organic pigments. These can be used alone or in combination.

  In order to increase the thermal conductivity of the coated paper, it is preferable to add a pigment having a small particle diameter as the pigment used in the coating layer. By adding a pigment having a small particle diameter, it is possible to fill the voids between the pigments and increase the thermal conductivity. As the pigment in the coating layer, a pigment having a particle diameter of 1 to 5 μm is used, but a pigment having a particle diameter of 3 μm or less is preferably used as a pigment having a small particle diameter. As the pigment having a small particle diameter, light calcium carbonate, titanium oxide, zinc oxide and the like are preferable.

Furthermore, the present invention is likely to produce an effect on so-called lightweight coated paper having a paper basis weight of 40 g / m ² or more and 100 g / m ² or less. When the basis weight is less than 40 g / m ^{2, the} show-through phenomenon in which the image can be seen through from the back side of the print surface is remarkable, and the product cannot be used on a product. On the other hand, if the basis weight exceeds 100 g / m ² , it is considered that the paper surface temperature at the time of fixing is lowered and the wax absorbability is lowered. Therefore, it is difficult to prevent the transfer member and the conveying member from being contaminated. The paper basis weight at which the effect of the present invention becomes more remarkable is a basis weight of 50 g / m ^{2 to} 90 g / m ² , and a basis weight of 60 g / m ^{2 to} 85 g / m ² .

  In the present invention, it is preferable to adjust the white paper glossiness of the image receiving surface of the coated paper to 40% or more and 70% or less. When the glossiness of the blank paper of the image receiving layer is less than 40%, the contrast between the blank paper portion and the image portion becomes too large and a uniform image cannot be obtained. A more preferable blank paper glossiness is 50% to 70% or more. If the glossiness of the blank paper exceeds 70%, it is not preferable because the contrast with the image halftone is large and a uniform image cannot be obtained.

  Further, in the present invention, it is desirable to adjust the air permeability (J Tappi No. 5, Oken air permeability) of the paper to 7000 seconds or less. When the air permeability of the paper exceeds 7000 seconds, the occurrence of a blister phenomenon due to the water vapor pressure generated by the evaporation of water in the paper at the time of fixing becomes noticeable. A more preferable air permeability is 5000 seconds or less, and a still more preferable air permeability is 3000 seconds or less.

  Various chemicals such as a sizing agent used for the substrate of the present invention can be used by internal or external addition. Types of sizing agents can include sizing agents such as rosin sizing agents, synthetic sizing agents, petroleum resin sizing agents, and neutral sizing agents. Suitable sizing agents such as sulfate bands and cationized starch, fibers Can be used in combination with other fixing agents. From the viewpoint of paper storage stability after copying in electrophotographic copying machines, printers, etc., neutral sizing agents such as alkenyl succinic anhydride sizing agents, alkyl ketene dimers, alkenyl ketene dimers, neutral rosins, petroleum sizes, Olefin resins and styrene / acrylic resins are preferred.

  Furthermore, for the purpose of adjusting the electrical resistance of paper, inorganic substances such as sodium chloride, potassium chloride, calcium chloride, sodium sulfate, zinc oxide, titanium dioxide, tin oxide, aluminum oxide, magnesium oxide, alkyl phosphate esters, alkyl Organic materials such as sulfuric ester acid, sulfonic acid sodium salt, quaternary ammonium salt and the like can be used alone or in combination.

  Further, a paper strength enhancer can be internally or externally added to the base material as required. Paper strength enhancers include starch, modified starch, vegetable gum, carboxymethylcellulose, polyvinyl alcohol, polyacrylamide, urea-formaldehyde resin, melamine-formaldehyde resin, dialdehyde starch, polyethyleneimine, epoxidized polyamide, polyamide / epichlorohydrin resin , Methylolated polyamide, chitosan derivatives and the like, and these materials can be used alone or in combination.

  In addition to these, various auxiliaries, such as dyes and pH adjusters, which are blended in ordinary coated paper base papers are appropriately used.

  Further, the coated paper of the present invention has a coating layer mainly composed of a pigment and an adhesive from the viewpoint of giving the same texture as that of a conventional coated paper and reducing the production cost.

  Synthetic adhesives used in the coating layer of the present invention include various copolymers such as styrene / butadiene, styrene / acryl, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, and polyvinyl alcohol. , Maleic anhydride copolymer, acrylic acid / methyl methacrylate copolymer and the like. One or more kinds of these synthetic adhesives can be used, and two or more kinds of synthetic adhesives having different glass transition temperatures can be used according to the purpose. These adhesives are used in the range of about 5 to 50% by weight, more preferably about 10 to 30% by weight per 100% by weight of the pigment.

  Also, as adhesives used in the coating layer, it is generally known such as oxidized starch, esterified starch, enzyme-modified starch and cold water soluble starch obtained by flash drying them, casein, soy protein and other natural adhesives. Adhesives. These adhesives are also used in the range of about 0.1 to 50% by weight, more preferably about 2 to 30% by weight per 100% by weight of the pigment.

  Moreover, various auxiliary | assistant mix | blended with normal pigments for coated papers, such as a dispersing agent, a thickener, a water retention agent, an antifoamer, and a water-proofing agent, are used suitably as needed.

The prepared coating composition uses a coating apparatus used in general coated paper production, such as a blade coater, air knife coater, roll coater, reverse roll coater, bar coater, curtain coater, die slot coater, gravure coater, etc. It is desirable to coat about ² to 20 g / m ^{2 on} one side by dry weight on the base paper in one layer or multiple layers by on-machine or off-machine. In order to increase the thermal conductivity, it is desirable to apply 7 to ²⁰ g / m ² .

  For the smoothing treatment after coating, it is desirable to use a smoothing apparatus that is usually used, for example, a super calendar, a machine calendar, a soft nip calender, etc., and finish it so that the gloss of the blank paper is 45% or more.

  Moreover, it is preferable to adjust the moisture content of the product immediately after opening by 3 to 6.5%, preferably 4.5 to 5.5% by a paper machine, a coater dryer, a calendar process, and the like.

Image forming method:
The image forming method of the present invention is characterized by using the electrophotographic transfer paper of the present invention. The image forming method of the present invention includes a known image forming step, for example, a step of forming a latent image on a latent image carrier, a step of developing the latent image using an electrophotographic developer, and a development process. Including a step of transferring the toner image onto the transfer member and a step of fixing the toner image on the transfer member, and as another method, an intermediate belt between the photosensitive member and the transfer member For example, a method may be employed in which the color toner images are superposed on each other and then the color toner images are collectively transferred to a transfer member and heated and melted for fixing.

  FIG. 1 is a schematic configuration diagram showing an example of an image forming apparatus preferably used in the image forming method of the present invention. The image forming apparatus shown in FIG. 1 includes a photoconductor 11, and around the photoconductor 11, a roller-type charger 12, an exposure device 13, and a developer 14a mounted with cyan, magenta, yellow, and black developers. , 14b, 14c, 14d, a belt-like intermediate transfer member 15, a cleaner 16, and a light static eliminator 17 are arranged in this order. The intermediate transfer member 15 is stretched around support shaft rollers 18a, 18b, and 18c. The support roller 18 a is in pressure contact with the photosensitive member 11 via the intermediate transfer member 15. The support roller 18 c is pressed against the transfer roller 19 via the intermediate transfer member 15. Further, a heat roller fixing device including a heating roller 1 and a pressure roller 2 for fixing the toner image transferred to the transfer medium 7 by the transfer roller 19 is provided.

  An image is formed as follows using the image forming apparatus shown in FIG. The photosensitive member 11 charged by the charger 12 is exposed by the exposure device 13 based on each image information of cyan, magenta, and yellow to form a latent image on the photosensitive member 11. The latent image on the photoconductor 11 is developed by developing devices 14a, 14b, 14c, and 14d built in the developing device 14 to form toner images. The developed toner image is transferred onto the belt-like intermediate transfer member 15. The toner image on the intermediate transfer member 15 moves to between the support roller 18c and the transfer roller 19 that is in pressure contact with the intermediate transfer member 15 as the intermediate transfer member 15 advances in the arrow P direction. . When the toner image on the intermediate transfer member 15 passes between the support roller 18c and the transfer roller 19 that is in pressure contact with the intermediate transfer member 15 (nip portion), the toner image inserted through the nip portion is inserted. Transferred onto the transfer body 20. The toner image transferred onto the transfer target 20 is fixed on the transfer target 20 by passing the transfer target 20 between the heating roller 1 and the pressure roller 2 to form an image. The toner image remaining on the photoconductor 11 after the toner image on the photoconductor 11 is transferred to the transfer target 20 is removed by the cleaner 16, and the residual charge remaining on the photoconductor 11 is removed by the photocharger 17. The charge is removed, and the next image formation is prepared.

  As the fixing device used in the image forming method of the present invention, a contact-type heat fixing device can be used. For example, a heating roller having a rubber elastic layer on a cored bar and, if necessary, a fixing member surface layer, a core A heat roller fixing device comprising a pressure roller having a rubber elastic layer on gold and optionally having a fixing member surface layer, a combination of the roller and the roller, a combination of the roller and the belt, a belt, A fixing device in place of the combination with the belt can be used.

  For the base material (core) of the fixing member, a material having excellent heat resistance, strong strength against deformation, and good thermal conductivity is selected. In the case of a roller type fixing device, for example, aluminum, iron, copper, etc. In the case of a belt-type fixing device, for example, a polyimide film, a stainless steel belt, or the like is selected. On the surface of the roller-type substrate, an elastic rubber layer usually made of silicone rubber, fluorine rubber or the like is provided on the surface.

  The fixing member may contain various additives depending on the purpose. For example, the fixing member contains carbon black, metal oxide, ceramic particles such as SiC, etc. for the purpose of improving wear resistance and controlling resistance. May be.

  The fixing process using the transfer medium of the present invention will be described in detail with reference to FIG. The thermocompression bonding apparatus shown in FIG. 2 is an apparatus in which the fixing member has a roller shape, and includes a heat roller 1, a pressure roller 2 disposed to face the heat roller 1, a heating source 3 for heating the heat roller 1, and a heat. And a fixing member surface layer 4 on the surface of the roller 1. An elastic layer 5 is formed on the surface of the heat roller 1. When the transfer body 7 on which the toner image 6 is formed passes between the pressure roller 2 and the heat roller 1, the image is fixed by being heated and pressed.

  2 further includes a cleaning member for removing toner adhering to the surface of the heat roller 1, a heating source 3 for heating the pressure roller 2, and a recording material as the heat roller 1. You may have the nail | claw (finger) etc. to peel from. The heating source 3 in the thermocompression bonding apparatus shown in FIG. 2 is controlled by a temperature control apparatus (not shown).

  The heat roller 1 and / or the pressure roller 2 are preferably provided with an elastic layer 5 having a single layer or a laminated structure. The thickness of the elastic layer is preferably 0.1 to 3 mm, and 0.5 to 2 mm. More preferred. The elastic layer 5 is made of heat-resistant rubber such as silicone rubber or fluorine rubber, and the rubber hardness is preferably 60 or less. The fixing member having the elastic layer 5 is advantageous in that the fixing member is deformed following the unevenness of the toner image 6 on the transferred body 7 and the smoothness of the image surface after fixing can be improved. is there. If the thickness of the elastic layer exceeds 3 mm, the heat capacity of the fixing member increases, and it takes a long time to heat the fixing member to a desired temperature. Absent. If the thickness of the elastic layer is less than 0.1 mm and is too thin, the deformation of the fixing member will not be able to follow the unevenness of the toner image, resulting in uneven melting, and the elastic layer effective for peeling cannot be obtained. It is not preferable in terms.

  Toners used in the image forming method of the present invention and the following toners can be preferably used. Generally, polyester resin or styrene-acrylic resin is mainly used as the resin component of the toner. In the toner, a wax is blended in order to give releasability from the fixing device. Examples of the wax include low molecular weight polyolefins such as polyethylene, polypropylene and polybutene, carnauba wax, rice wax, plant wax such as candelis wax tree wax, jojoba oil, animal wax such as beeswax; montan wax, ozokerite, Mineral and petroleum waxes such as ceresin, paraffin wax, microcrystalline wax, Fischer-Tropsch wax; ester waxes of higher fatty acids such as stearyl stearate and behenyl behenate and higher alcohols; butyl stearate, propyl oleate, monostearin Ester waxes of higher fatty acids such as acid glycerides, distearic glycerides, pentaerythritol tetrabehenate and the like or unitary or polyhydric lower alcohols; Ester waxes composed of higher fatty acids such as monostearate, dipropylene glycol distearate, distearic diglyceride and tetrastearic acid triglyceride and polyhydric alcohol multimers; sorbitan higher fatty acid ester waxes such as sorbitan monostearate; cholesteryl Cholesterol higher fatty acid ester waxes such as stearate can be mentioned. These release agents may be used alone or in combination of two or more.

  The addition amount of these release agents is suitably in the range of 0.5 to 50% by weight, preferably 1 to 30% by weight, more preferably 5 to 15% by weight, based on the toner weight. If the amount is less than 0.5% by weight, the effect of adding a release agent is not exhibited, and if it exceeds 50% by weight, the fixability is deteriorated, which is not preferable.

  As a method for producing the toner, any production method such as a pulverization method or a polymerization method may be used. A resin particle dispersion in which resin particles are dispersed and a colorant dispersion in which a colorant is dispersed are mixed to form a resin. A method is preferred in which the particles and the colorant are aggregated to a toner particle size, and the resulting aggregate is heated and fused to a temperature above the glass transition point of the resin.

  In the present invention, the volume average particle diameter of the toner is preferably in the range of 2 to 8 μm, and more preferably in the range of 3 to 7 μm. When the volume average particle diameter of the toner is less than 2 μm, the chargeability tends to be insufficient and the developability may be deteriorated. On the other hand, when it exceeds 7 μm, the resolution of the image may be deteriorated. Therefore, it is not preferable respectively.

  Here, the volume average particle diameter of the toner means a particle diameter at which the cumulative volume becomes 50% from the small diameter side. For example, Coulter Counter TA-II (manufactured by Nikka Kisha Co., Ltd.), Multisizer II (manufactured by Nikka Kisha Co., Ltd.). ) Or the like.

  The particle size distribution of the toner is preferably such that the volume average particle size distribution GSDv is 1.28 or less, more preferably 1.25 or less. A sharp toner can be obtained. If GSDv exceeds 1.28, the sharpness and resolution of the image are lowered, which is not preferable.

Here, the average particle size distribution index GSDv of the toner is a ratio (D _84v / D _16v ) of the particle diameter D _16v at which the cumulative volume is 16% to the particle diameter D _84v at which the cumulative volume is 84% from the small diameter side. It refers to the square root and can be measured using the same device as the volume average particle diameter.

  The electrostatic image developer is not particularly limited except that it contains a toner, and can have an appropriate component composition depending on the purpose.

  When the toner is used alone, the electrostatic image developer is prepared as a one-component electrostatic image developer, and when used in combination with a carrier, the toner is prepared as a two-component electrostatic image developer.

  The carrier used as the two-component electrostatic image developer is not particularly limited, and examples thereof include resin-coated carriers described in JP-A Nos. 62-39879 and 56-11461. A known carrier can be used.

  The mixing ratio of the toner and the carrier in the electrostatic image developer is not particularly limited and can be appropriately selected depending on the purpose.

  Since the image forming method of the present invention uses the electrophotographic transfer paper of the present invention, it improves the transfer failure and running trouble caused by the wax blended in the toner and has reliability.

  Hereinafter, the present invention will be described more specifically with reference to examples, but of course, the scope of the present invention is not limited thereto. In the examples, “parts” and “%” represent “parts by weight” and “% by weight”, respectively, unless otherwise specified.

Example 1
Light pulp calcium carbonate to 100 parts by weight of pulp slurries obtained by beatting hardwood bleached kraft pulp (hereinafter referred to as “LBKP”) with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and having a freeness of 400 ml. (Softon 1200, manufactured by Bihoku Flour Industries) 20 parts by weight, aluminum sulfate 0.4 parts by weight, cationized starch (trade name: MS4600 manufactured by Nippon Food Chemical Co., Ltd.) 0.3 parts by weight, and alkenyl succinic anhydride (Fibran 81, manufactured by Oji National Co., Ltd.) was added in an amount of 0.08 parts by weight, and these mixtures were diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

10% by weight of the pigment component of the coating composition to be coated [precipitation calcium carbonate having a BET specific surface area of 35 m ² / g and a particle size of 2.3 μm (trade name: Callite KT, manufactured by Shiroishi Kogyo Co., Ltd.) %, Precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiraishi Kogyo Co., Ltd.) 10% by weight, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.) 10% by weight, kaolin (Ultra White) 90, 70% by weight of Engelhard Co., Ltd.], 3% by weight of oxidized starch (Ace A, Oji Cornstarch Co., Ltd.) as the adhesive (solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430) And 2507H, a blending ratio of 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and a dispersant (Aron T-40 manufactured by Toa Gosei Co., Ltd.) 0.3% by weight. The composition was both surfaces Nurihi by the blade coater on one side 10 g / m ^2, dried and subjected to smoothing processing as gloss white paper supercalendered a roll temperature of 50 ° C. is 60%, a basis weight of 80 g / m to obtain a ² density of 1.2 g / cm electrophotographic transfer paper ^3.

Example 2
100 parts by weight of pulp comprising 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 23 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

10% by weight of the pigment component of the coating composition to be coated [precipitation calcium carbonate having a BET specific surface area of 35 m ² / g and a particle size of 2.3 μm (trade name: Callite KT, manufactured by Shiroishi Kogyo Co., Ltd.) %, Precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiraishi Kogyo Co., Ltd.) 10% by weight, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.) 10% by weight, kaolin (Ultra White) 90 wt. Of Engelhard Co., Ltd.) and 60 wt.% Of aluminum powder (T500D: manufactured by Daiwa Metal Co., Ltd.)], 3 wt. Of oxidized starch (Ace A Oji Cornstarch Co., Ltd.) as an adhesive % (Solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (a) The down T-40 manufactured by Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 10 g / m ^2, dried, supercalendered of roll temperature 50 ° C. Smoothing was performed so that the gloss of the white paper was 45%, and an electrophotographic transfer paper having a basis weight of 80 g / m ² density of 1.1 g / cm ³ was obtained.

Example 3
100 parts by weight of pulp comprising 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

To this substrate, 100% by weight of a pigment component of a coating composition to be coated [BET specific surface area of 275 m ² / g, ultrafine powder synthetic amorphous silica having a particle size of 2.6 μm (Fine Seal X37: manufactured by Tokuyama) 15% by weight, precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiraishi Kogyo) 10% by weight, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), 10% by weight, kaolin ( Ultra white 90, manufactured by Engelhard Co., Ltd.) 60% by weight and aluminum powder (T500D: manufactured by Daiwa Metal Co., Ltd.) 5% by weight], as an adhesive, oxidized starch (manufactured by Ace A Oji Cornstarch Co., Ltd.) 3% by weight (solid ratio to pigment; the same applies hereinafter), synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant ( Ron T-40 manufactured by Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 10 g / m ^2, dried, supercalendered of roll temperature 50 ° C. Smoothing was performed so that the gloss of the white paper was 40%, and an electrophotographic transfer paper having a basis weight of 80 g / m ² density of 1.1 g / cm ³ was obtained.

Example 4
10 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries) per 100 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating LBKP pulp slurry with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) , 0.4 parts by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600 manufactured by Nippon Food Chemical Co., Ltd.), and alkenyl succinic anhydride (Fibran 81, manufactured by Oji National Co., Ltd.) 0 0.08 part by weight was added, and these mixtures were diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

15% by weight of the pigment component of the coating composition to be coated on this substrate [BET specific surface area 140 m ² / g, particle size 3.0 μm, ultrafine hydrous silicic acid (Mizukasil P526: made by Mizusawa Chemical Co., Ltd.) 10% by weight of precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiroishi Kogyo), 10% by weight of light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), kaolin ( Oxidized starch (Ace A made by Oji Cornstarch Co., Ltd.) as an adhesive for 60% by weight of Ultra White 90 (manufactured by Engelhard Co., Ltd.) and 5% by weight of aluminum powder (T500D: manufactured by Daiwa Metal Co., Ltd.) 3% by weight (solid ratio to pigment; the same applies hereinafter), synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (a) The down T-40 manufactured by Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 10 g / m ^2, dried, supercalendered of roll temperature 50 ° C. Smoothing was performed so that the gloss of the white paper was 50%, and an electrophotographic transfer paper having a basis weight of 80 g / m ² density of 1.1 g / cm ³ was obtained.

Example 5
5 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries) per 100 parts by weight of pulp slurry having a freeness of 380 ml obtained by beating LBKP pulp slurry with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) , 0.4 parts by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600 manufactured by Nippon Food Chemical Co., Ltd.), and alkenyl succinic anhydride (Fibran 81, manufactured by Oji National Co., Ltd.) 0 0.08 part by weight was added, and these mixtures were diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Applied by a size press so that the coating amount is 1.0 g / m ² in dry weight, and after drying, smoothing treatment is performed by a machine calendar so that the Oken type smoothness becomes 20 seconds, A base material having a basis weight of 26 g / m ² was obtained.

15% by weight of the pigment component of the coating composition to be coated on this substrate [BET specific surface area 140 m ² / g, particle size 3.0 μm, ultrafine hydrous silicic acid (Mizukasil P526: made by Mizusawa Chemical Co., Ltd.) 10% by weight of precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiroishi Kogyo), 10% by weight of light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), kaolin ( Oxidized starch (Ace A made by Oji Cornstarch Co., Ltd.) as an adhesive for 60% by weight of Ultra White 90 (manufactured by Engelhard Co., Ltd.) and 5% by weight of aluminum powder (T500D: manufactured by Daiwa Metal Co., Ltd.) 3% by weight (solid ratio to pigment; the same applies hereinafter), synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (a) The down T-40 manufactured by Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 7 g / m ^2, dried, supercalendered of roll temperature 50 ° C. Smoothing was performed so that the gloss of the white paper was 30%, and an electrophotographic transfer paper having a basis weight of 40 g / m ² density of 1.1 g / cm ³ was obtained.

Example 6
100 parts by weight of pulp comprising 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A substrate having a basis weight of 80 g / m ² was obtained.

15% by weight of the pigment component of the coating composition to be coated on this substrate [BET specific surface area 140 m ² / g, particle size 3.0 μm, ultrafine hydrous silicic acid (Mizukasil P526: made by Mizusawa Chemical Co., Ltd.) 10% by weight of precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiroishi Kogyo), 10% by weight of light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), kaolin ( Oxidized starch (Ace A made by Oji Cornstarch Co., Ltd.) as an adhesive for 60% by weight of Ultra White 90 (manufactured by Engelhard Co., Ltd.) and 5% by weight of aluminum powder (T500D: manufactured by Daiwa Metal Co., Ltd.) 3% by weight (solid ratio to pigment; the same applies hereinafter), synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (a) The down T-40 manufactured by Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 7 g / m ^2, dried, supercalendered of roll temperature 50 ° C. Smoothing was performed so that the gloss of the white paper was 50%, and an electrophotographic transfer paper having a basis weight of 100 g / m ² density of 1.1 g / cm ³ was obtained.

Example 7
100 parts by weight of pulp comprising 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 90 g / m ² was obtained.

15% by weight of the pigment component of the coating composition to be coated on this substrate [BET specific surface area 140 m ² / g, particle size 3.0 μm, ultrafine hydrous silicic acid (Mizukasil P526: made by Mizusawa Chemical Co., Ltd.) 10% by weight of precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiroishi Kogyo), 10% by weight of light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), kaolin ( Oxidized starch (Ace A made by Oji Cornstarch Co., Ltd.) as an adhesive for 60% by weight of Ultra White 90 (manufactured by Engelhard Co., Ltd.) and 5% by weight of aluminum powder (T500D: manufactured by Daiwa Metal Co., Ltd.) 3% by weight (solid ratio to pigment; the same applies hereinafter), synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (a) The down T-40 manufactured by Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 7 g / m ^2, dried, supercalendered of roll temperature 50 ° C. Smoothing was performed so that the gloss of the white paper was 50%, and an electrophotographic transfer paper having a basis weight of 110 g / m ² density of 1.1 g / cm ³ was obtained.

Example 8
100 parts by weight of pulp comprising 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo Co., Ltd.) and 90 parts by weight of pulp slurry having a freeness of 380 ml obtained by beating LBKP pulp slurry with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Applied with a size press so that the coating amount is 1.0 g / m ² in dry weight, and after drying, smoothing treatment was performed by a machine calendar so that the Oken smoothness becomes 70 seconds, A base material having a basis weight of 60 g / m ² was obtained.

5% of the pigment component of the coating composition to be coated [BET specific surface area 140 m ² / g, particle size of 3.0 μm ultrafine hydrous silicic acid (Mizukasil P526: made by Mizusawa Chemical Co., Ltd.) 10% by weight, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), 80% by weight of kaolin (Ultra White 90, manufactured by Engelhard Co., Ltd.), aluminum powder (T500D: 5% by weight of Daiwa Metal Powder Industrial Co., Ltd.], 3% by weight of oxidized starch (Ace A manufactured by Oji Cornstarch Co., Ltd.) (solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, A coating ratio of 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and a dispersant (Aron T-40 manufactured by Toa Gosei Co., Ltd.) 0.3% by weight of the above coating composition was blended at 7 g / m on one side. ² After coating on both sides with a lade coater, after drying, smoothing is performed with a super calender with a roll temperature of 50 ° C. so that the gloss of the white paper becomes 75%, and an electrophotography with a basis weight of 80 g / m ² density 1.1 g / cm ³ A transfer paper was obtained.

Example 9
100 parts by weight of pulp consisting of 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating LBKP pulp slurry with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

30% by weight of the pigment component of the coating composition to be coated [BET specific surface area of 140 m ² / g, particle size of 3.0 μm with ultrafine hydrous silicic acid (Mizukasil P526: made by Mizusawa Chemical Co., Ltd.) 5% by weight, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), kaolin (Ultra White 90, manufactured by Engelhard Co., Ltd.) 60% by weight, aluminum powder (T500D: 5% by weight of Daiwa Metal Powder Industrial Co., Ltd.], 3% by weight of oxidized starch (Ace A manufactured by Oji Cornstarch Co., Ltd.) (solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, A coating ratio of 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and a dispersant (Aron T-40 manufactured by Toa Gosei Co., Ltd.) 0.3% by weight of the above coating composition was blended at 7 g / m on one side. ² After coating on both sides with a lade coater, after drying, smoothing treatment is performed with a super calender with a roll temperature of 50 ° C. so that the gloss of the white paper becomes 35%, and an electrophotography with a basis weight of 80 g / m ² density 1.1 g / cm ³ A transfer paper was obtained.

Example 10
100 parts by weight of pulp comprising 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

To this base material, 35% by weight of pigment component of the coating composition to be coated [BET specific surface area of 140 m ² / g, particle size of 3.0 μm ultrafine hydrous silicic acid (Mizukasil P526: made by Mizusawa Chemical Co., Ltd.)] 5% by weight, light calcium carbonate (trade name: Tamapearl T-123, manufactured by Okutama Kogyo Co., Ltd.), kaolin (Ultra White 90, manufactured by Engelhard Co., Ltd.) 55% by weight, aluminum powder (T500D: 5% by weight of Daiwa Metal Powder Industrial Co., Ltd.], 3% by weight of oxidized starch (Ace A manufactured by Oji Cornstarch Co., Ltd.) (solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, A coating ratio of 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and a dispersant (Aron T-40 manufactured by Toa Gosei Co., Ltd.) 0.3% by weight of the above coating composition was blended at 7 g / m on one side. ² After coating on both sides with a lade coater, after drying, smoothing is performed with a super calender with a roll temperature of 50 ° C. so that the gloss of the white paper is 30%, and an electrophotography with a basis weight of 80 g / m ² density 1.1 g / cm ³ A transfer paper was obtained.

Example 11
100 parts by weight of pulp comprising 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

100% by weight of pigment component of the coating composition to be coated on this substrate [10% by weight of silica having a BET specific surface area of 300 m ² / g and a particle size of 2.5 μm (trade name: NIPGEL AZ-200, manufactured by Tosoh Corporation) , Precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiraishi Kogyo Co., Ltd.) 5 wt%, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.) 10 wt%, kaolin (Ultra White 90) And 70% by weight of Engelhard Co., Ltd.) and 5% by weight of aluminum powder (T500D: manufactured by Daiwa Metal Co., Ltd.)], 3% by weight of oxidized starch (Ace A made by Oji Cornstarch Co., Ltd.) as an adhesive (Solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (Aron T 40 Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 10 g / m ^2, dried, blank supercalendered a roll temperature of 50 ° C. Gloss Was smoothed so as to be 45%, and an electrophotographic transfer paper having a basis weight of 80 g / m ² density of 1.1 g / cm ³ was obtained.

Example 12
100 parts by weight of pulp comprising 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 23 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

100% by weight of pigment component of the coating composition to be coated on this substrate [10% by weight of hydrous amorphous silicon dioxide having a BET specific surface area of 50 m ² / g and a particle size of 2 μm (trade name: Nipsil E75, manufactured by Tosoh Corporation) 10% by weight of precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiroishi Kogyo), 10% by weight of light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), kaolin (Ultra White 90) , Engelhard Co., Ltd.) 60% by weight, aluminum powder (T500D: manufactured by Daiwa Metals Co., Ltd.) 10% by weight], 3% by weight of oxidized starch (Ace A Oji Cornstarch Co., Ltd.) as an adhesive (Solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, compounding ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant ( Ron T-40 manufactured by Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 10 g / m ^2, dried, supercalendered of roll temperature 50 ° C. Smoothing was performed so that the gloss of the white paper was 45%, and an electrophotographic transfer paper having a basis weight of 80 g / m ² density of 1.1 g / cm ³ was obtained.

Example 13
From 95 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating the pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) from 5 parts by weight of polyester fiber (Tebilus regular type: manufactured by Teijin Fibers Ltd.) 100 parts by weight of the resulting pulp, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industry), 0.4 parts by weight of aluminum sulfate, and cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) 0.3 part by weight and 0.08 part by weight of alkenyl succinic anhydride (Fibran 81, manufactured by Oji National Co., Ltd.) are added, and the mixture is diluted with white water to obtain a paper having a solid content of 0.3%. A slurry was prepared. After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

100% by weight of the pigment component of the coating composition to be coated on this substrate [BET specific surface area 275 m ² / g, ultrafine powder synthetic amorphous silica having a particle size of 2.6 μm (Fine Seal X-37: manufactured by Tokuyama Corporation) ) 10% by weight, precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiraishi Kogyo) 10% by weight, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), 10% by weight, Oxidized starch (Ace A Oji Cornstarch Co., Ltd.) as an adhesive for kaolin (Ultra White 90, manufactured by Engelhard Co., Ltd.) and 50% iron powder (iron powder: JFE Steel Co., Ltd.) 3% by weight (solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (Aron) T-40 Toa Gosei Co., Ltd.) The above coating composition containing 0.3% by weight was coated on both sides with a blade coater at 10 g / m ² on one side, dried, and then blank with a super calendar at a roll temperature of 50 ° C. The film was smoothed so that its gloss was 40%, and an electrophotographic transfer paper having a basis weight of 80 g / m ² density of 1.1 g / cm ³ was obtained.

Example 14
From 70 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) from 30 parts by weight of polyester fiber (Tevirus regular type: made by Teijin Fibers) 100 parts by weight of the resulting pulp, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industry), 0.4 parts by weight of aluminum sulfate, and cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) 0.3 part by weight and 0.08 part by weight of alkenyl succinic anhydride (Fibran 81, manufactured by Oji National Co., Ltd.) are added, and the mixture is diluted with white water to obtain a paper having a solid content of 0.3%. A slurry was prepared. After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 90 g / m ² was obtained.

15% by weight of 100% by weight of pigment component of the coating composition to be coated [BET specific surface area of 140 m ² / g, particle size of 3 μm, hydrous silicic acid (Mizukasil P526: made by Mizusawa Chemical Co., Ltd.) 10% by weight of precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiroishi Kogyo), 10% by weight of light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), kaolin (Ultra White) 90%, manufactured by Engelhard Co., Ltd.) and 60% by weight of iron powder (5% by weight of iron powder (manufactured by JFE Steel Co., Ltd.)). % (Solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (Aron T-40) The Toagosei Co., Ltd.) The coated composition was 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 7 g / m ^2, dried, gloss white paper supercalendered a roll temperature of 50 ° C. is Smoothing treatment was performed so as to be 50%, and an electrophotographic transfer paper having a basis weight of 110 g / m ² density of 1.1 g / cm ³ was obtained.

Example 15
100 parts by weight of pulp comprising 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 23 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

100% by weight of the pigment component of the coating composition to be coated on this substrate [BET specific surface area 50 m ² / g, ultrafine particle TiO _{2 having} an average particle size of 0.4 μm (trade name: ST-100, manufactured by Titanium Industry) 10% by weight, precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiroishi Kogyo Co., Ltd.), 10% by weight, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), 10% by weight, kaolin (Ultra White 90, manufactured by Engelhard Co., Ltd.) 65% by weight and aluminum powder (T500D: manufactured by Daiwa Metal Co., Ltd.) 5% by weight] ) 3% by weight (solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (a) The down T-40 manufactured by Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 10 g / m ^2, dried, supercalendered of roll temperature 50 ° C. Smoothing was performed so that the gloss of the white paper was 45%, and an electrophotographic transfer paper having a basis weight of 80 g / m ² density of 1.1 g / cm ³ was obtained.

Example 16
23 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries) with respect to 100 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating LBKP pulp slurry with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) , 0.4 parts by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600 manufactured by Nippon Food Chemical Co., Ltd.), and alkenyl succinic anhydride (Fibran 81, manufactured by Oji National Co., Ltd.) 0 0.08 part by weight was added, and these mixtures were diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained. A substrate with a coated paper density of 1.05 g / cm ³ was obtained.

10% by weight of the pigment component of the coating composition to be coated [precipitation calcium carbonate having a BET specific surface area of 35 m ² / g and a particle size of 2.3 μm (trade name: Callite KT, manufactured by Shiroishi Kogyo Co., Ltd.) %, Precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiraishi Kogyo Co., Ltd.) 10% by weight, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.) 10% by weight, kaolin (Ultra White) 90%, manufactured by Engelhard Co., Ltd.) and 65% by weight of aluminum powder (T500D: manufactured by Daiwa Metals Co., Ltd.), 3% by weight of oxidized starch (Ace A Oji Cornstarch Co., Ltd.) as an adhesive % (Solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersing agent (alloy) The T-40 manufactured by Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 10 g / m ^2, dried, blank supercalendered of roll temperature 50 ° C. The film was smoothed so that the gloss of the film was 40%, and an electrophotographic transfer paper having a basis weight of 80 g / m ² density of 1.05 g / cm ³ was obtained.

Example 17
23 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries) with respect to 100 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating LBKP pulp slurry with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) , 0.4 parts by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600 manufactured by Nippon Food Chemical Co., Ltd.), and alkenyl succinic anhydride (Fibran 81, manufactured by Oji National Co., Ltd.) 0 0.08 part by weight was added, and these mixtures were diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

10% by weight of the pigment component of the coating composition to be coated [precipitation calcium carbonate having a BET specific surface area of 35 m ² / g and a particle size of 2.3 μm (trade name: Callite KT, manufactured by Shiroishi Kogyo Co., Ltd.) %, Precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiraishi Kogyo Co., Ltd.) 10% by weight, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.) 10% by weight, kaolin (Ultra White) 90%, manufactured by Engelhard Co., Ltd.) and 65% by weight of aluminum powder (T500D: manufactured by Daiwa Metals Co., Ltd.), 3% by weight of oxidized starch (Ace A Oji Cornstarch Co., Ltd.) as an adhesive % (Solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersing agent (alloy) The T-40 manufactured by Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 15 g / m ^2, dried, pressed by a super calendar roll temperature 50 ° C. Smoothing treatment was performed so that the gloss was 60% by increasing the pressure, and an electrophotographic transfer paper having a basis weight of 90 g / m ² density 1.35 g / cm ³ was obtained.

Comparative Example 1
LBKP 100 parts by weight of pulp slurry was beaten with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.). 10 parts by weight, 0.4 parts by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600 manufactured by Nippon Food Chemical Co., Ltd.), and alkenyl succinic anhydride (Fibrane 81, Oji National ( Co., Ltd.)) 0.08 part by weight was added, and these mixtures were diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

100% by weight of the pigment component of the coating composition to be coated on this substrate [light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.) 20% by weight, kaolin (Ultra White 90, Engel 80% by weight of HARD Co., Ltd.] and 3% by weight of oxidized starch (Ace A, manufactured by Oji Cornstarch Co., Ltd.) (solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, The above coating composition containing a blending ratio of 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and a dispersant (Aron T-40 manufactured by Toa Gosei Co., Ltd.) 0.3% by weight, 10 g / m on one side. ² were both surfaces Nurihi by a blade coater, dried, subjected to smoothing process as gloss white paper supercalendered a roll temperature of 50 ° C. is 80%, a basis weight of 80 g / ^{m 2} density 1.1 g / cm ³ To obtain an electrophotographic transfer paper.

Comparative Example 2
100 parts by weight of pulp consisting of 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating LBKP pulp slurry with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

100% by weight of the pigment component of the coating composition to be coated on this base material [10% by weight of precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiroishi Kogyo), light calcium carbonate (trade name: Tamapearl T-123 , Okutama Kogyo Co., Ltd.) 20% by weight, Kaolin (Ultra White 90, Engelhard Co., Ltd.) 60% by weight, Aluminum powder (T500D: manufactured by Daiwa Metal Co., Ltd.) 10% by weight] As an adhesive, oxidized starch (Ace A, manufactured by Oji Cornstarch Co., Ltd.) 3% by weight (solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14 wt%, and a dispersing agent (manufactured by Aron T-40 from Toagosei Co.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 10 g / m ² After drying, it carried out a smoothing process to a gloss white paper supercalendered a roll temperature of 50 ° C. is 45%, was obtained electrophotographic transfer paper having a basis weight of 80 g / ^{m 2} Density 1.1 g / cm ^3.

Comparative Example 3
100 parts by weight of a pulp comprising 65 parts by weight of a pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 35 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 23 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring this stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Riki Kogyo Co., Ltd.), and then the wet starch was coated with oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.). , Applied with a size press so that the coating amount is 1.0 g / m ² in dry weight, and after drying, smoothing treatment was performed by a machine calendar so that the Oken smoothness becomes 70 seconds, A base material having a basis weight of 60 g / m ² was obtained.

100% by weight of the pigment component of the coating composition to be coated [precipitation calcium carbonate having a BET specific surface area of 35 m ² / g (trade name: Callite KT, manufactured by Shiroishi Kogyo Co., Ltd.) Product name: Brilliant-15, manufactured by Shiroishi Kogyo Co., Ltd., 15% by weight, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), 10% by weight, Kaolin (Ultra White 90, Engelhard Co., Ltd.) )) And 55% by weight of aluminum powder (T500D: manufactured by Daiwa Metal Powder Industrial Co., Ltd.), and 3% by weight of oxidized starch (Ace A manufactured by Oji Cornstarch Co., Ltd.) as an adhesive (solid ratio to pigment) Hereinafter the same) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (Aron T-40 East) Synthesis Ltd.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 10 g / m ^2, dried, gloss white paper supercalendered a roll temperature of 50 ° C. is 35 %, An electrophotographic transfer paper having a basis weight of 80 g / m ² density of 1.1 g / cm ³ was obtained.

Comparative Example 4
100 parts by weight of pulp consisting of 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating LBKP pulp slurry with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

100% by weight of the pigment component of the coating composition to be coated on this substrate [BET specific surface area 330 m ² / g, ultrafine hydrous silicic acid having a particle size of 4 μm (trade name: Mizukasil P-78A, manufactured by Tosoh Corporation) 10% by weight, precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiroishi Kogyo) 5% by weight, light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), 10% by weight, kaolin ( Oxidized starch (Ace A made by Oji Cornstarch Co., Ltd.) as an adhesive for 70% by weight of Ultra White 90, manufactured by Engelhard Co., Ltd. and 5% by weight of aluminum powder (T500D: manufactured by Daiwa Metal Co., Ltd.) 3% by weight (solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (Aron T -40 manufactured by Toa Gosei Co., Ltd.) The above coating composition containing 0.3% by weight was coated on both sides with a blade coater at 10 g / m ² on one side, dried, and then dried with a super calendar at a roll temperature of 50 ° C. Smoothing treatment was performed so that the gloss was 30%, and an electrophotographic transfer paper having a basis weight of 80 g / m ² density of 1.1 g / cm ³ was obtained.

Comparative Example 5
A commercially available coated paper, High Alpha 79.1 g / m ² (manufactured by Hokuetsu Paper Co., Ltd.) was used.

Comparative Example 6
100 parts by weight of pulp consisting of 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating LBKP pulp slurry with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

15% by weight of pigment component 100% by weight of the coating composition to be coated [BET specific surface area 220 m ² / g, average fine particle size 13 μm hydrous silicic acid (Mizukasil P526: made by Mizusawa Chemical Co., Ltd.) %, Precipitated calcium carbonate (trade name: Brilliant-15, manufactured by Shiroishi Kogyo Co., Ltd.), 15% by weight, (light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.), 10% by weight, kaolin (Ultra White 90, manufactured by Engelhard Co., Ltd.), 60% by weight), and 3% by weight of oxidized starch (Ace A, manufactured by Oji Cornstarch Co., Ltd.) (solid ratio to pigment; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (Aron T-40 manufactured by Toa Gosei Co., Ltd.) 0.3% by weight was blended. The Kinuri the composition, and both surfaces Nurihi by one side 10 g / m ² of the blade coater, dried, subjected to smoothing process as gloss white paper supercalendered a roll temperature of 50 ° C. is 40%, the basis weight An electrophotographic transfer paper having an 80 g / m ² density of 1.05 g / cm ³ was obtained.

Comparative Example 7
100 parts by weight of pulp comprising 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 60 g / m ² was obtained.

100% by weight of the pigment component of the coating composition to be coated [40% by weight of ultrafine hydrous silicic acid having a BET specific surface area of 140 m ² / g (Mizukasil P526: made by Mizusawa Chemical Co., Ltd.), light calcium carbonate (Product name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.) 5% by weight, kaolin (Ultra White 90, manufactured by Engelhard Co., Ltd.) 30% by weight, aluminum powder (T500D: manufactured by Daiwa Metal Co., Ltd.) 25% by weight] as an adhesive, 3% by weight of oxidized starch (Ace A manufactured by Oji Cornstarch Co., Ltd.) (solid ratio to pigment; the same applies hereinafter) and a synthetic adhesive (LX430 and 2507H, blending ratio 20:80, Nippon Zeon Co.) 14 wt%, and a dispersing agent (manufactured by Aron T-40 from Toagosei Co.) the coated composition 0.3 wt% blending blade code one side 10 g / ^{m 2} The double-sided Nurihi, dried, subjected to smoothing process as gloss white paper supercalendered a roll temperature of 50 ° C. is 40%, for electrophotography having a basis weight of 80 g / ^{m 2} Density 1.1 g / cm ³ A transfer paper was obtained.

Comparative Example 8
100 parts by weight of pulp comprising 90 parts by weight of pulp slurry having a freeness of 400 ml obtained by beating a pulp slurry of LBKP with Niagara Beata (manufactured by Kumagai Riki Kogyo Co., Ltd.) and 10 parts by weight of polyethylene fiber (Dyneema SK60: manufactured by Toyobo) On the other hand, 20 parts by weight of light calcium carbonate (Softon 1200, manufactured by Bihoku Flour Industries), 0.4 part by weight of aluminum sulfate, 0.3 parts by weight of cationized starch (trade name: MS4600, manufactured by Nippon Food Chemical Co., Ltd.) , And 0.08 parts by weight of alkenyl succinic anhydride (Fibran 81, Oji National Co., Ltd.) were added, and the mixture was diluted with white water to prepare a paper slurry having a solid content concentration of 0.3%. . After stirring the stock slurry for 2 hours, paper was made using an oriented sheet former (manufactured by Kumagai Rikkoku Kogyo Co., Ltd.), and then oxidized starch (Ace B, manufactured by Oji Constarch Co., Ltd.) was applied to the wet paper. , Apply with a size press device so that the coating amount is 1.0 g / m ² in dry weight, and after drying, perform a smoothing treatment with a machine calendar so that the Oken smoothness becomes 50 seconds, A base material having a basis weight of 50 g / m ² was obtained.

100% by weight of the pigment component of the coating composition to be coated on this substrate [10% by weight of ultrafine hydrous silicic acid having a BET specific surface area of 140 m ² / g (Mizukasil P526: manufactured by Mizusawa Chemical Industry), precipitated calcium carbonate (Trade name: Brilliant-15, manufactured by Shiroishi Kogyo) 10% by weight, (light calcium carbonate (trade name: Tama Pearl T-123, manufactured by Okutama Kogyo Co., Ltd.) 10% by weight, kaolin (Ultra White 90, Engelhard) Co., Ltd.) 60% by weight and aluminum powder (T500D: manufactured by Daiwa Metal Powder Industrial Co., Ltd. 10% by weight), 3% by weight of oxidized starch (Ace A Oji Cornstarch Co., Ltd.) as an adhesive (based on the pigment) Solid ratio; the same applies hereinafter) and synthetic adhesive (LX430 and 2507H, blending ratio 20:80, manufactured by Nippon Zeon Co., Ltd.) 14% by weight, and dispersant (Aron T-40) Nitrous Synthesis Ltd.) the coated composition 0.3 wt% blending, double-sided Nurihi by the blade coater on one side 20 g / m ^2, dried, and the press pressure super calendar roll temperature 60 ° C. elevated Smoothing was performed so that the gloss of the white paper was 65%, and an electrophotographic transfer paper having a basis weight of 90 g / m ² density 1.40 g / cm ³ was obtained.

(Quality evaluation method)
(1) Basis weight:
It measured by the method of JIS P-8124.

(2) Blank paper glossiness:
Measurement was performed at an incident angle of 75 degrees according to JIS P-8142. The measurement was performed using a GLOSS METER MODEL GM-26D model manufactured by Murakami Color Research Laboratory.

(3) Thermal conductivity of paper:
Measurement Method of Thermal Resistance and Thermal Conductivity of Thermal Insulation Material In accordance with JIS A1412, measurement was performed with a Kato Tech KES-F7 in an environment of 23 ° C. and 50% RH. The sample was conditioned according to JISP8111, the temperature difference of the sample was 10 ° C., and the hot plate area was 25 cm ² .

(4) Driving test:
The running test of the transfer paper was carried out using a dry indirect electrophotographic digital color copying machine DocuCenter Color 500CP manufactured by Fuji Xerox. The DocuCenter Color 500CP machine includes a latent image carrier, a charging unit that charges the surface of the latent image carrier, a latent image forming unit that forms a latent image on the surface of the latent image carrier, toner, A developer which contains a developer made of a carrier, develops the latent image with the developer layer formed on the surface of the developer carrier, and forms a toner image on the surface of the latent image carrier; An image forming apparatus includes a transfer unit that transfers a toner image to a transfer target and a fixing unit that heat-presses the toner image on the transfer target. As a print image, an image identification number N3 (image name fruit basket) of an ISO / JIS-SCID sample (issued by the Japanese Standards Association) was used on both sides. The paper was A4 size longitudinal paper, and the paper was run with the short side as the leading edge. Each side was run 100 times on both sides, and the number of running troubles in the transfer section and the transport section was confirmed.

(5) Transfer portion transfer defect evaluation:
After replacing the transfer belt and the transfer roll with new ones and carrying out the running test, it is confirmed that the transfer failure occurs at the same position as the wax adhering to the belt and roll.
(Double-circle): There is no transfer defect generation | occurrence | production in all 100 sheets, and it is permissible.
○: The number of transfer defect occurrence samples is 1 to 2, but is slight. acceptable.
(Triangle | delta): The number of transfer defect generation | occurrence | production samples is 1-2 sheets, and it can confirm clearly visually. Unacceptable.
X: The number of transfer defect occurrence samples is 3 or more.

(6) Evaluation of conveyance failure occurrence:
The conveyance system roll at the time of double-sided running was replaced with a new one, the above running test was performed, and the following method was evaluated.
(Double-circle): In all 100 sheets, there is no driving | running | working defect and there is no wax adhesion to a conveyance roll, and it is permissible.
◯: Wax adhesion to the transport roll can be confirmed and allowed without any running failure in all 100 sheets.
X: One or more out of 100 sheets have poor runnability due to wax and are unacceptable.

(7) Blister evaluation:
Paper blister evaluation of the transfer paper was carried out using a dry indirect electrophotographic digital color copying machine DocuCenter Color 500CP manufactured by Fuji Xerox. The copy manuscript has a halftone dot area ratio of 100% for cyan, magenta, and yellow, and the images for single-sided printing and double-sided printing are placed at the same position on the front and back of the paper. Went. The paper feed sample was used immediately after opening the package, and double-sided printing was performed. As a toner, a resin particle dispersion in which resin particles are dispersed and a colorant dispersion in which a colorant is dispersed are mixed to aggregate the resin particles and the colorant into a toner particle diameter. A toner obtained by heating and fusing to a temperature higher than the glass transition point and having a SF1 of 134 and a GSDv of 1.22 was used.
The evaluation criteria were as follows.
(Double-circle): The thing which blister is not generate | occur | produced is acceptable.
○: Occurred but cannot be confirmed by visual observation, acceptable.
(Triangle | delta): It can confirm visually and the thing which disturbs an image is unacceptable.
X: It can be confirmed by tactile sensation and the image gloss is lowered, which is unacceptable.

(8) Coating layer strength:
A metal roll with a weight of 200 g and a width of 50 mm is rotated once on a lightly folded recording paper, the surface of the coating layer is brought into contact with a black paper, and the deposits from the coating layer are observed. Evaluated.
A: Almost no coating layer is removed. acceptable.
○: The coating layer is slightly removed. acceptable.
(Triangle | delta): The coating layer thing is taken and it has taken on the line on black paper. Unacceptable.
X: The coating layer was removed, and it was removed on a line having a width of 1 mm or more on black paper. Unacceptable.

(9) Image contrast:
Using DocuColor500CP installed in a 23 ° C 50% RH environment, output the image identification number N1 (image name portrait) of the ISO / JIS-SCID sample (issued by the Japanese Standards Association) for paper seasoned in a 23 ° C 50% RH environment. The image contrast was evaluated according to the following evaluation criteria.
A: Excellent with no difference between the gloss of the image area and the gloss of the white paper.
○: Good with little difference between gloss of image area and gloss of blank paper. acceptable.
Δ: The difference between the gloss of the image portion and the gloss of the white paper is slightly inferior. Unacceptable.
X: The difference between the gloss of the image portion and the gloss of the white paper is large, which is remarkably inferior. Unacceptable.

The evaluation results are shown in Tables 1, 2, and 3.

  As is apparent from Tables 1, 2, and 3, the electrophotographic transfer paper of the present invention is a transfer failure due to wax in the transfer portion and a running trouble due to the fixing property of the conveying member in a system that uses toner mixed with wax. No blisters were generated, the coating layer strength was high, and the image contrast was excellent. On the other hand, the comparative example cannot satisfy all of these evaluations. Therefore, the coated paper of the present invention has excellent reliability in running performance in electrophotographic copying machines and printers as compared with conventional coated paper, is free of blisters, and has a coating layer. It has high strength, excellent image contrast, and extremely high product value.

  The present invention can be applied to, for example, recording paper (paper) of an image forming apparatus such as an electrophotographic copying machine or printer.

1 is a schematic configuration diagram illustrating an example of an image output apparatus used in an image forming method of the present invention. 1 is a schematic configuration diagram illustrating an example of a heat fixing device used in an image forming method of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating roller, 2 Pressure roller, 3 Heat source, 4 Fixing member surface layer, 5 Elastic layer, 6 Toner image, 7 Transfer object (recording material), 11 Photoconductor, 12 Roller type charger, 13 Exposure apparatus, 14 four-color developing units (14a, 14b, 14c, 14d), 15 intermediate transfer member,
16 Cleaner, 17 Light static eliminator, 18 Spindle roller (18a, 18b, 18c), 19 Transfer roller, 20 Transfer object.

Claims (4)

A coated paper having a coating layer mainly composed of a pigment and an adhesive on both surfaces of a substrate, the coating layer containing a pigment having a BET specific surface area of 35 to 300 m ² / g, and coating thermal conductivity of 0.04~0.1 W / m · ℃ der paper is, and the density of the coated paper is 1.05 g / cm ³ or more, 1.35 g / cm ³ or less der wherein Rukoto Electrophotographic transfer paper. A coated paper having a coating layer mainly composed of a pigment and an adhesive on both sides of the substrate, the basis weight of the coated paper being 40 g / m ^{2 to} 100 g / m ² or less, and a BET specific surface area ^2. The electrophotographic transfer paper according to claim 1, wherein the pigment comprises 35 to 300 m ² / g of pigment in an amount of 5 to 30% by weight based on the coating layer coating amount. Claim 1 or claim 2 for electrophotography paper for transfer, wherein the gloss at 75 ° of the blank portion is 40% to 70%. Forming a latent image on the latent image carrier; developing the latent image using an electrophotographic developer; transferring the developed toner image to a transfer member using a transfer member; A fixing step of heat-pressing a toner image on a transfer body, wherein the toner contains a wax,
The image forming method according to claim 1, wherein the transfer target is the electrophotographic transfer sheet according to claim 1.

Images