JP2006306032A - Substrate for image recording material, its manufacturing method and image recording material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a substrate for image recording material having less small holes (minute recesses) generated after coating a thermoplastic layer on a base paper, and to provide its manufacturing method and the image recording material. <P>SOLUTION: The substrate for the image recording material comprises the base paper and the thermoplastic resin layer formed on at least one face of the base paper. The base paper is processed by a calender using rolls having surface temperature of 200°C or higher. The rolls have surface layers containing at lease one selected from cermet materials. The cermet material is a tungsten carbide cermet which is preferably one selected from tungsten carbide-cobalt, tungsten carbide-cobalt chromium and tungsten carbide-nickel chromium. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a support for an image recording material suitable for various image recording materials such as an electrophotographic material, a heat sensitive material, a sublimation transfer material, a heat transfer material, a heat developing material, a silver salt photographic material, and an ink jet recording material, and the image recording material. The present invention relates to a method for efficiently producing a support for an image and an image recording material.

Conventionally, metal rolls used for the production of a support for image recording materials are prone to rust, and if this rust adheres to the support, it will be disturbed during the formation of the image recording layer, resulting in an appearance failure. For this reason, from the viewpoint of rust prevention and prevention of scratches on the roll surface, industrial chrome plating has been generally performed on the roll surface.
In addition, in the support for image recording material, soft calendar processing is performed on the image recording surface of the base paper in order to obtain good smoothness (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3). However, in order to obtain higher bulkiness and good smoothness, it is necessary to perform calendar treatment at a high heating temperature of 200 to 350 ° C.

  The industrial chrome plating has a high possibility of causing cracks at a heating temperature at a heating temperature of 150 ° C. or higher. For this reason, it is necessary to suppress the coating thickness as much as possible. Further, when the surface of the calender roll is scratched, it is generally used after polishing. However, if the coating thickness is thin in this way, if the surface is scratched, the plating process must be performed again, leading to an increase in cost. Furthermore, the industrial chrome plating is cracked at a high temperature of 250 ° C. or higher, and this crack forms the surface of the paper or the roll base material rusts. Therefore, it is used at a temperature of 250 ° C. or higher. There is a problem that you can not.

  For this reason, soft calendering is performed without industrial chrome plating on the roll surface, especially when surface sizing is performed with a liquid containing a water-soluble metal salt in the previous step, A large amount of rust is generated on the roll due to the promotion of oxidation due to oxidization, resulting in appearance failure. On the other hand, if the water-soluble metal salt is not applied, the antistatic function necessary for the image recording material support cannot be imparted, and thus the rust prevention treatment to the metal roll is essential.

  Therefore, a base paper having good smoothness can be obtained by calendering using a roll that has no cracks on the surface even at high temperatures and has an excellent rust prevention effect, and after the base paper is coated with a thermoplastic resin layer The present situation is that no method for producing an image recording material support having excellent smoothness with a small number of small holes (small dents) efficiently and inexpensively has yet been provided.

JP-A-4-110939 JP-A-6-282037 JP 7-70973 A

  An object of the present invention is to solve the above-described problems and achieve the following objects. That is, according to the present invention, a base paper having good smoothness can be obtained by calendering using a roll having no surface cracks even at high temperatures and having excellent wear resistance and rust prevention effect. It is possible to coat the thermoplastic resin layer on the surface of the image recording material support and the base paper with less generation of small holes (small dents) after coating the thermoplastic resin layer at high speed and at low cost. Another object of the present invention is to provide a method for producing a support for an image recording material.

Means for solving the problems are as follows. That is,
<1> A support for an image recording material having a base paper and a thermoplastic resin layer on at least one surface of the base paper,
The support for an image recording material, wherein the base paper is calendered with a roll having a surface temperature of 200 ° C. or more, and the roll has a surface layer containing at least one selected from cermet materials. It is.
<2> The support for image recording materials according to <1>, wherein the roll has a surface temperature of 200 to 350 ° C.
<3> Either of <1> to <2>, wherein the surface of the base paper on which the image recording layer is provided is calendered so as to contact a roll having a surface layer containing at least one selected from cermet materials It is a support for image recording materials of description.
<4> The method according to any one of <1> to <3>, wherein the surface of the base paper opposite to the surface on which the image recording layer is provided is calendered so as to contact a roll having a Shore D hardness of 60 to 95 °. It is a support for an image recording material.
<5> The image recording material support according to any one of <1> to <4>, wherein the cermet material is a tungsten carbide cermet.
<6> The support for an image recording material according to <5>, wherein the tungsten carbide cermet is any one of tungsten carbide-cobalt, tungsten carbide-cobalt chromium, and tungsten carbide-nickel chromium.
<7> The support for image recording materials according to any one of <1> to <6>, wherein the surface layer has a thickness of 60 to 220 μm.
<8> The support for image recording materials according to any one of <1> to <7>, wherein the roll has a surface roughness of 0.5 S or less.
<9> The support for an image recording material according to any one of <1> to <8>, wherein the base paper before calendar treatment contains an antistatic agent.
<10> The support for an image recording material according to <9>, wherein the antistatic agent is a water-soluble metal salt, and the water-soluble metal salt is any one of calcium chloride, sodium chloride, and magnesium chloride. is there.
<11> The support for image recording materials according to any one of <1> to <10>, wherein the thermoplastic resin layer contains a polyolefin resin.
<12> A roll having a surface layer containing at least one material selected from tungsten carbide cermet materials is in contact with the surface of the base paper on which the image recording layer is provided, and the surface temperature of the roll is 200 ° C. The method for producing a support for an image recording material, comprising the step of calendaring as described above.
<13> The method for producing a support for an image recording material according to <12>, including a surface size treatment step of applying a liquid containing a water-soluble metal salt to the surface of the base paper before the calendar treatment.
<14> The method for producing a support for an image recording material according to any one of <12> to <13>, including a step of forming a thermoplastic resin layer on at least one surface of the base paper after the calendar process.
<15> An image recording material comprising: the image recording material support according to any one of <1> to <11> and an image recording layer on which at least an image is recorded.
<16> The image recording material according to <15>, wherein the image recording material is any one selected from electrophotographic materials, heat-sensitive materials, sublimation transfer materials, thermal transfer materials, silver salt photographic materials, and inkjet recording materials.

  The support for image recording material of the present invention comprises a base paper and a thermoplastic resin layer on at least one surface of the base paper, and the base paper is calendered with a roll having a surface temperature of 200 ° C. or more. In addition, since the roll has a surface layer containing at least one selected from cermet materials, there are few occurrences of small holes (fine dents) and excellent smoothness. For example, electrophotographic materials and heat-sensitive materials It is widely used for sublimation transfer materials, thermal transfer materials, thermal development materials, silver salt photographic materials, ink jet recording materials and the like.

In the method for producing a support for an image recording material of the present invention, a roll having a surface layer containing at least one material selected from tungsten carbide-based cermet materials is in contact with the surface of the base paper on which the image recording layer is provided. And a step of calendering the roll at a surface temperature of 200 ° C. or higher.
In the method for producing a support for an image recording material of the present invention, good smoothness can be obtained by carrying out a calendering process using a roll that has no cracks on the surface even at high temperatures and is excellent in wear resistance and rust prevention effect. Thus, a support for an image recording material can be efficiently produced with less occurrence of small holes (minute dents) after the base paper is coated with a thermoplastic resin layer.

  According to the present invention, conventional problems can be solved, and there is no occurrence of cracks on the surface even at high temperatures, and smoothness is good by performing a calendering process using a roll excellent in wear resistance and rust prevention effect. Is obtained, and the base for image recording material in which small holes (micro-dents) are less generated after the base paper is coated with the thermoplastic resin layer, and the surface of the base paper is coated with the thermoplastic resin layer at high speed. Therefore, it is possible to provide a method for manufacturing an image recording material support efficiently and inexpensively.

(Support for image recording material)
The support for an image recording material of the present invention comprises a base paper and a thermoplastic resin layer on at least one surface of the base paper, and further comprises other layers as necessary.

-Base paper-
The base paper is not particularly limited and may be appropriately selected depending on the intended purpose. Specifically, it is a high-quality paper, for example, “Photographic Engineering Basics—Silver Salt Photography” edited by the Japan Photography Society, Papers described in pages 223 to 224 of the company Corona (Showa 54) are preferred.

  The base paper is not particularly limited as long as it is a known material used for a support, and can be appropriately selected from various materials according to the purpose. For example, natural pulp such as conifers and hardwoods, Examples include a mixture of pulp and synthetic pulp.

As the pulp that can be used as the raw material of the base paper, the hardwood pulp is preferable from the viewpoint of improving the flatness and dimensional stability of the base paper at the same time in a well-balanced and sufficient level, but the softwood pulp is used. You can also.
Examples of the hardwood pulp include hardwood bleached kraft pulp (LBKP) and hardwood sulfite pulp (LBSP). Among these, hardwood bleached kraft pulp (LBKP) is preferable.
There is no restriction | limiting in particular as content of the said hardwood pulp with respect to the said paper, Although it can select suitably according to the objective, For example, 50 mass% or more is preferable, 60 mass% or more is more preferable, 75 mass% or more Is more preferable.

Examples of the softwood pulp include softwood bleached kraft pulp (NBKP).
As the pulp, it is preferable to mainly use hardwood pulp having a short fiber length. There is no restriction | limiting in particular in this fiber length, According to the objective, it can select suitably, 0.5-0.8 mm is preferable.
A beater, refiner, or the like can be used to beat the pulp. Various additives can be further added to the pulp slurry obtained after beating the pulp (hereinafter, also referred to as “pulp stock”) as necessary. Examples of the additive include a filler, a dry paper strength enhancer, a sizing agent, a wet paper strength enhancer, a fixing agent, a pH adjuster, and other agents.

Examples of the filler include calcium carbonate, clay, kaolin, white clay, talc, titanium oxide, diatomaceous earth, barium sulfate, aluminum hydroxide, and magnesium hydroxide.
Examples of the dry paper strength enhancer include cationized starch, cationized polyacrylamide, anionized polyacrylamide, amphoteric polyacrylamide, and carboxy-modified polyvinyl alcohol.
Examples of the sizing agent include fatty acid salts, rosin derivatives such as rosin and maleated rosin, paraffin wax, alkyl ketene dimer, alkenyl succinic anhydride (ASA), compounds containing higher fatty acids such as epoxidized fatty acid amide, etc. Is mentioned.
Examples of the wet paper strength enhancer include polyamine polyamide epichlorohydrin, melamine resin, urea resin, and epoxidized polyamide resin.
Examples of the fixing agent include polyvalent metal salts such as aluminum sulfate and aluminum chloride, and cationic polymers such as cationized starch.
Examples of the pH adjuster include caustic soda and sodium carbonate.
As said other chemical | medical agent, an antifoamer, dye, a slime control agent, an optical brightener, etc. are mentioned, for example.
Furthermore, a softening agent etc. can also be added as needed. As the softening agent, for example, those described in New Handbook for Paper Processing (Edited by Paper Medicine Time), pages 554 to 555 (issued in 1980) can be used.
These various additives may be used alone or in combination of two or more. Moreover, there is no restriction | limiting in particular in the addition amount in these pulp paper materials, such as these various additives, It can select suitably according to the objective, Usually, 0.1-1.0 mass% is preferable.

If necessary, the pulp slurry contains pulp paper stock containing the above-mentioned various additives, such as a paper machine, a long paper machine, a round paper machine, a twin wire machine, a combination machine, and the like. It is used to make paper and then dried to produce a base paper. Moreover, surface sizing treatment can be performed either before or after the drying as desired.
The surface sizing solution used for the surface sizing is, for example, a metal salt of at least one of an alkali metal salt and an alkaline earth metal salt, a water-soluble polymer compound, a fluorescent brightening agent, a water-resistant substance, a pigment, Contains dyes and the like.
As the metal salt of at least one of the alkali metal salt and the alkaline earth metal salt, those described above can be used.

The water-soluble polymer compound is not particularly limited and may be appropriately selected depending on the intended purpose. For example, polyvinyl alcohol, carboxy-modified polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, cellulose sulfate, polyethylene oxide, gelatin, cation Starch, casein, sodium polyacrylate, styrene-maleic anhydride copolymer sodium salt, sodium polystyrene sulfonate, etc., among these, polyvinyl alcohol, carboxy-modified polyvinyl alcohol, carboxymethylcellulose, hydroxyethylcellulose, cellulose Sulfate, polyethylene oxide, and gelatin are preferable, and polyvinyl alcohol (PVA) is more preferable.
The content of the water-soluble polymer compound is preferably 0.5 to ² g / m ² .

Examples of the fluorescent brightener include stilbene compounds, coumarin compounds, biphenyl compounds, benzoxazoline compounds, naphthalimide compounds, pyrazoline compounds, carbostyril compounds, diaminostilbene disulfonic acid derivatives, imidazole derivatives, Examples include coumarin derivatives, triazole derivatives, carbazole derivatives, pyridine derivatives, naphthalic acid derivatives, imidazolone derivatives, and the like. Among these, stilbene compounds are preferable.
Although content in particular of the said optical brightener is not restrict | limited, 0.01-0.5 mass% is preferable and 0.02-0.2 mass% is more preferable.
Examples of the water-resistant substance include latex / emulsions such as styrene-butadiene copolymer, ethylene-vinyl acetate copolymer, polyethylene resin, vinylidene chloride copolymer; polyamide polyamine epichlorohydrin, and the like.
Examples of the pigment include calcium carbonate, clay, kaolin, talc, barium sulfate, and titanium oxide.

  The base paper has a longitudinal Young's modulus (Ea) to lateral Young's modulus (Eb) ratio (Ea / Eb) of 1.5 to 1.5 for the purpose of improving the rigidity and dimensional stability of the image recording material support. 2.0 is preferred. In the range where the Ea / Eb value is less than 1.5 or more than 2.0, the rigidity and dimensional stability of the support for the image recording material are liable to be deteriorated, and the running property during transportation is hindered. May be.

In general, paper “strain” varies based on the beating style, and the elastic force (rate) of the paper made after beating is used as an important factor to express the degree of paper “strain”. Can do. In particular, the elastic modulus of paper is measured by measuring the speed of sound propagating through the paper, using the relationship between the dynamic elastic modulus and density, which indicates the physical properties of the viscoelastic material of the paper, and using an ultrasonic vibration element. Can be obtained from the following equation.
E = ρc ² (1-n ² )
In the above formula, E represents a dynamic elastic modulus. ρ represents density. c represents the speed of sound in the paper. n represents a Poisson's ratio.

In the case of normal paper, since n = about 0.2, even if it is calculated by the following formula, it can be calculated without much difference.
E = ρc ²
Therefore, if the density and sound speed of paper can be measured, the elastic modulus can be easily obtained. In the above mathematical formula, when measuring the speed of sound, for example, various known devices such as Sonic Tester SST-110 (manufactured by Nomura Corporation) can be used.

There is no restriction | limiting in particular in the thickness of the said base paper, Although it can select suitably according to the objective, Usually, 30-500 micrometers is preferable, 50-300 micrometers is more preferable, 100-250 micrometers is still more preferable. There is no restriction | limiting in particular in the basic weight of the said base paper, Although it can select suitably according to the objective, For example, 50-250 g / m < ² > is preferable and 70-200 g / m < ² > is more preferable.

  The base paper is calendered with a roll having a surface temperature of 200 ° C. or more, and the roll has a surface layer containing at least one selected from cermet materials.

-Roll-
The roll is not particularly limited and may be appropriately selected according to the purpose. For example, the roll includes a metal roll and a surface layer on the surface of the metal roll, and further includes other configurations as necessary. Have.

There is no restriction | limiting in particular as a material of the said metal roll, Although it can select suitably according to the objective, For example, chilled steel, forged steel, etc. are mentioned.
The surface layer contains at least one selected from cermet materials, and further contains other components as necessary.

The cermet material is not particularly limited and may be appropriately selected depending on the intended purpose. For example, aluminum oxide-nickel chromium, magnesium zirconate-nickel chromium aluminum, tungsten carbide cermet, chromium carbide-nickel, chromium carbide -Nickel chromium, chromium carbide-nickel chromium-aluminum-yttrium, and the like. Among these, tungsten carbide cermet is particularly preferable.
Examples of the tungsten carbide cermet include tungsten carbide-cobalt, tungsten carbide-nickel chromium, tungsten carbide-cobalt chromium, tungsten carbide-nickel, tungsten carbide-cobalt nickel platinum, tungsten carbide-cobalt nickel-chromium aluminum-yttrium, tungsten carbide. -Chromium carbide-cobalt nickel chromium etc. are mentioned. Among these, tungsten carbide-cobalt, tungsten carbide-cobalt chromium, and tungsten carbide-nickel chromium are preferable. Tungsten carbide-cobalt can form a dense film after thermal spraying, the surface roughness after polishing finish is reduced, and It is particularly preferable because it is excellent in wear and is suitable for calendar use.

The surface layer is not particularly limited and may be appropriately selected according to the purpose. However, the surface layer may be prepared by using the cermet material, for example, by a high-speed flame spraying method, a plasma spraying method, a powder flame spraying method, or the like. it can.
The thickness of the surface layer is preferably 60 to 220 μm, and more preferably 100 to 200 μm. If the thickness is less than 60 μm, it cannot be polished when the surface is scratched, so it may be necessary to provide a surface layer again. If it exceeds 220 μm, the thermal spray coating peels off and becomes a dent, The surface of the base paper may be scratched.
The surface roughness (smoothness) of the roll is preferably 0.5S or less, and more preferably 0.3S or less. Here, the surface roughness of the roll can be measured by, for example, Surfcom 120A manufactured by Tokyo Seimitsu Co., Ltd.

-Calendar processing-
As the calendering, the base paper is calendered with a roll having a surface layer containing at least one material selected from the tungsten carbide cermet materials and having a surface temperature of 200 ° C. or higher.

  The surface temperature of the roll is 200 ° C. or higher, preferably 200 to 350 ° C., more preferably 230 to 280 ° C. When the surface temperature is less than 200 ° C., the generation of small holes (fine dents) after coating with the thermoplastic resin may be deteriorated (increased). Yellowing and scorching that may have been discolored by heat may occur.

  In the calendering process, a surface of the base paper on which the image recording layer is provided has a surface layer containing at least one material selected from the tungsten carbide cermet material, and a roll having a surface temperature of 200 ° C. or more is provided. On the other hand, a so-called soft calendering process in which the surface of the base paper on which the image recording layer is not provided is calendered so that a roll (preferably a resin roll) having a Shore D hardness of 60 to 95 ° is in contact with the surface is bulky. It is preferable from the viewpoint of obtaining good smoothness.

There is no restriction | limiting in particular as a nip pressure in the case of the said calendar process, Although it can select suitably according to the objective, 50 kg / cm or more of linear pressures are preferable, and 80-350 kg / cm is more preferable.
The passing speed when the base paper passes through the nip portion of the calendar is preferably 50 to 800 m / min, more preferably 70 to 600 m / min, and particularly preferably 90 to 500 m / min. When the speed is less than 50 m / min, the production efficiency may be deteriorated, and when it exceeds 800 m / min, the time for the base paper to pass through the nip portion is shortened, and the calendar processing effect may not be obtained.

The base paper before the calendar treatment preferably contains an antistatic agent for the purpose of imparting an antistatic function. It is preferable that the antistatic agent is a water-soluble metal salt, and the water-soluble metal salt is any one of calcium chloride, sodium chloride, and magnesium chloride.
The content of the antistatic agent in the base paper is preferably 1.0 to 5.0% by mass.

-Thermoplastic resin layer-
The thermoplastic resin layer is provided on at least one side of the base paper, preferably on both sides. The thermoplastic resin layer is provided in at least one layer, and two or more layers can be provided.
The polymer constituting the thermoplastic resin layer is preferably a film-forming resin, and particularly preferably a polyolefin resin.
Suitable examples of the polyolefin resin include polyethylene, polypropylene, a blend of polypropylene and polyethylene, high density polyethylene (HDPE), a blend of high density polyethylene and low density polyethylene (LDPE), and the like.

The thermoplastic resin layer may contain an inorganic pigment such as titanium dioxide, a bluing agent, a fluorescent brightening agent, an antioxidant, and the like, and particularly preferably contains titanium dioxide. Further, from the viewpoint of improving the adhesiveness of the thermoplastic resin layer with the base paper, a tackifier resin, an adhesive resin, or the like can be contained. Further, if necessary, an antioxidant, a release agent, a hollow polymer and the like may be contained.
There is no restriction | limiting in particular in the thickness of the said thermoplastic resin layer, Although it can select suitably according to the objective, For example, 3-47 micrometers is preferable.

(Method for producing support for image recording material)
The method for producing a support for an image recording material of the present invention includes a calendering process, a surface sizing process, and a thermoplastic resin layer forming process, and further includes other processes as necessary.

-Calendar processing process-
In the calendering process, the surface temperature of the roll is adjusted so that a roll having a surface layer containing at least one selected from the tungsten carbide cermet material is in contact with the surface of the base paper on which the image recording layer is provided. This is a process of calendering at 200 ° C. or higher. In addition, the material of the surface layer of the roll, the conditions for the calendar treatment, and the like are as described above.

-Surface size treatment process-
The surface sizing process is a process of applying a liquid containing a water-soluble metal salt to the surface of the base paper before calendering. Thereby, a necessary antistatic function can be imparted to the image recording material support.
The water-soluble metal salt as the antistatic agent is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include calcium chloride, sodium chloride and magnesium chloride.
There is no restriction | limiting in particular as said application | coating method, According to the objective, it can select suitably, For example, it can carry out using brush coating, a roll coater, a die coater, a curtain coater, etc.

-Thermoplastic resin layer formation process-
The thermoplastic resin layer forming step is a step of forming a thermoplastic resin layer on at least one surface of the base paper after the calendar process.
The method for forming the thermoplastic resin layer is not particularly limited and may be appropriately selected depending on the purpose. It is formed by coating the thermoplastic resin layer by any one of lamination methods using a single layer or multilayer extrusion die, a laminator or the like.
There is no restriction | limiting in particular as a shape of the die | dye for said single layer or multilayer extrusion, According to the objective, it can select suitably, For example, a T die, a coat hanger die, etc. are mentioned suitably. The coating speed of the thermoplastic resin layer is preferably 100 to 600 m / min.
Before forming the thermoplastic resin layer, the base paper is preferably subjected to activation treatment such as corona discharge treatment, flame treatment, glow discharge treatment, or plasma treatment.

According to the method for producing a support for an image recording material of the present invention, the support for an image recording material of the present invention is excellent in smoothness with little occurrence of small holes (small dents), and at low cost. Can be manufactured.
The support for an image recording material of the present invention produced as described above includes an electrophotographic material, a heat sensitive material, a sublimation transfer material, a thermal transfer material, a heat developing material, a silver salt photographic material, an ink jet recording material and the like described below. Can be suitably used.

(Image recording material)
The image recording material of the present invention comprises at least an image recording layer on the support for image recording material, and further comprises other layers as necessary.

-Image recording layer-
The image recording layer varies depending on the use and type of the image recording material.For example, a toner image receiving layer for electrophotographic materials, a thermochromic layer for heat sensitive materials, a heat diffusible dye for sublimation transfer materials, and a heat melting material for thermal transfer materials. An ink-forming ink, a silver salt photographic material, an image forming layer that develops a color such as at least Y (yellow), M (magenta), and C (cyan), a colorant receiving layer that can receive an aqueous or oil-based ink in an inkjet recording material, Etc.

  The image recording layer is not particularly limited and may be appropriately selected depending on the intended purpose. However, a resin coating layer is preferably used, and if necessary, the resin coating layer contains other components. Do it.

  The polymer in the resin coating layer is not particularly limited as long as a coating liquid containing a resin composition can be prepared, and can be appropriately selected according to the purpose, but a thermoplastic resin is preferable. The thermoplastic resin includes (1) polyolefin resin, (2) polystyrene resin, (3) acrylic resin, (4) polyvinyl acetate or a derivative thereof, (5) polyamide resin, and (6) polyester resin. , (7) polycarbonate resin, (8) polyether resin (or acetal resin), (9) other resins, and the like. These thermoplastic resins may be used individually by 1 type, and may use 2 or more types together.

Examples of the polyolefin-based resin (1) include polyolefin resins such as polyethylene and polypropylene, and copolymer resins of olefins such as ethylene and propylene and other vinyl monomers. Examples of the copolymer resin of olefin and other vinyl monomer include ethylene-vinyl acetate copolymer, ionomer resin that is a copolymer of acrylic acid and methacrylic acid, and the like. Examples of the polyolefin resin derivative include chlorinated polyethylene and chlorosulfonated polyethylene.
Examples of the polystyrene-based resin (2) include polystyrene resin, styrene-isobutylene copolymer, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), and polystyrene-anhydrous. A maleic acid resin etc. are mentioned.
Examples of the acrylic resin (3) include polyacrylic acid or esters thereof, polymethacrylic acid or esters thereof, polyacrylonitrile, and polyacrylamide. The characteristics of the polyacrylic acid esters and polymethacrylic acid esters vary greatly depending on the type of ester group. Moreover, the copolymer with other monomers (For example, acrylic acid, methacrylic acid, styrene, vinyl acetate, etc.) is also mentioned. The polyacrylonitrile is often used as a copolymer of the AS resin and ABS resin rather than a homopolymer.
Examples of the polyvinyl acetate of (4) or a derivative thereof include, for example, polyvinyl acetate, polyvinyl alcohol obtained by saponifying polyvinyl acetate, and polyvinyl alcohol as an aldehyde (for example, formaldehyde, acetaldehyde, butyraldehyde, etc.). Examples thereof include polyvinyl acetal resins obtained by reaction.
The polyamide-based resin (5) is a polycondensate of diamine and dibasic acid, and examples thereof include 6-nylon and 6,6-nylon.
The polyester resin (6) is a polycondensate of alcohol and acid, and the characteristics differ greatly depending on the combination. Examples include general-purpose resins polyethylene terephthalate and polybutylene terephthalate composed of an aromatic dibasic acid and a dihydric alcohol.
The polycarbonate resin (7) is generally a polycarbonate obtained from bisphenol A and phosgene.
Examples of the polyether resin (or acetal resin) of (8) include polyether resins such as polyethylene oxide and polypropylene oxide, and acetal resins such as polyoxymethylene as a ring-opening polymerization system.
Examples of the other resin (9) include polyaddition polyurethane resins.

[Water-based polymer]
The resin coating layer is preferably formed using an aqueous polymer such as a water-dispersible polymer or a water-soluble polymer for the following reasons. That is, the water-based polymer does not discharge an organic solvent in the coating and drying process, is excellent in environmental suitability and workability, and is used as a solvent for a release agent or the like to be blended in an image recording layer to be described later, particularly a toner image receiving layer. In addition, the release agent is easy to bleeding on the surface in the coating and drying process of the resin coating layer, the effect of the release agent is easily obtained, and the water dispersion form is more stable and suitable for production. Excellent.

  As the water-based polymer, a self-dispersing water-based polyester emulsion or a water-dispersed acrylic resin is more preferable for the following reason. That is, since the self-dispersing water-based polyester emulsion or the water-dispersing acrylic resin is a self-dispersing type that does not use a surfactant, the hygroscopic property is low even in a high humidity atmosphere, and the softening point is less lowered by moisture. It is possible to suppress the occurrence of offset at the time of fixing and exaggeration of adhesion between sheets at the time of storage, and furthermore, since a polyester resin that easily takes a molecular structure with high cohesive energy is used, it has sufficient hardness in the storage environment In the electrophotographic fixing process using a toner image receiving layer as the image recording layer, a low elastic (low viscosity) molten state is obtained, and the toner is embedded in the image receiving layer, so that a sufficient image quality can be achieved.

  The water-based polymer does not specify the composition, bond structure, molecular structure, molecular weight, molecular weight distribution, or form. Examples of the water-based group of the water-based thermoplastic resin include a sulfonic acid group, a hydroxyl group, a carboxylic acid group, an amino group, an amide group, and an ether group.

  Water-dispersible polymers include water-dispersed resins such as water-dispersed acrylic resins, water-dispersed polyester resins, water-dispersed polystyrene resins and water-dispersed urethane resins; acrylic resin emulsions, polyvinyl acetate emulsions, SBR (styrene / butadiene / rubber) ) Water-dispersible emulsions such as emulsions; resins and emulsions in which thermoplastic resins such as resins having ester bonds, polyurethane resins, polyamide resins, polysulfone resins, polyvinyl chloride resins, polyvinyl butyral, polycaprolactone resins, polyolefin resins are dispersed in water They can be appropriately selected from these copolymers, mixtures, and cationically modified ones, and two or more of them can be combined.

The water dispersible emulsion is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a water dispersible polyurethane emulsion, a water dispersible polyester emulsion, a chloroprene emulsion, a styrene-butadiene emulsion, and a nitrile. -Butadiene emulsion, butadiene emulsion, vinyl chloride emulsion, vinylpyridine-styrene-butadiene emulsion, polybutene emulsion, polyethylene emulsion, vinyl acetate emulsion, ethylene-vinyl acetate emulsion, vinylidene chloride emulsion, methyl methacrylate -Butadiene type emulsion etc. are mentioned. Among these, a water dispersible polyester emulsion is more preferable.
As a commercially available product of the water dispersible polymer, for example, in the polyester series, Toyobo Co., Ltd. Bironal series, Takamatsu Yushi Co., Ltd. Pes Resin A series, Kao Corporation Tufton UE series, Nippon Gosei Co., Ltd. Polyester WR series, Unitika's erière series, acrylic-based high loss XE, KE, PE series, Nihon Junyaku's Jurimer ET series, and the like.

  The water-soluble polymer is not particularly limited and can be appropriately selected depending on the purpose. For example, polyvinyl alcohol, carboxy-modified polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, cellulose sulfate, polyethylene oxide, gelatin, cationized starch, Casein, sodium polyacrylate, sodium styrene-maleic anhydride copolymer, sodium polystyrene sulfonate, and the like can be mentioned, and among these, polyethylene oxide is preferable.

Examples of the water-soluble polymer include Research Disclosure No. 17,643, page 26, No. 18,716, page 651, No. 307,105, pages 873-874, and JP-A No. 64-13546 (71). ) To (75).
Specifically, for example, vinyl pyrrolidone-vinyl acetate copolymer, styrene-vinyl pyrrolidone copolymer, styrene-maleic anhydride copolymer, water-soluble polyester, water-soluble acrylic, water-soluble polyurethane, water-soluble nylon, water-soluble The epoxy resin can be used, and the gelatin can be selected from so-called demineralized gelatin with a reduced content of lime-processed gelatin, acid-processed gelatin, calcium, etc. according to various purposes, and used in combination. It is also preferable.
Commercially available products of the water-soluble polyester include, for example, various plus coats manufactured by Tateo Chemical Industry Co., Ltd .; Finetex ES series manufactured by Dainippon Ink and Chemicals Co., Ltd .; Dainippon Ink & Chemicals, Inc. Finetex 6161, K-96; Seiko Chemical Industries, Ltd. High Loss NL-1189, BH-997L, and the like.

  The content of the aqueous polymer in the resin coating layer is not particularly limited and may be appropriately selected depending on the purpose. For example, it is preferably 20% by mass or more based on the mass of the resin coating layer. 30 to 100% by mass is more preferable.

  As the thermoplastic resin for the resin coating layer, JP-A-5-127413, JP-A-8-194394, JP-A-8-334915, JP-A-8-334916, JP Those satisfying the physical properties disclosed in JP-A-9-171265 and JP-A-10-221877 are preferably used.

  As said other component contained in the said resin coating layer, unless it impairs the function of the said resin coating layer, a crosslinking agent, UV or EB hardening | curing agent, for example, a plasticizer, a slip agent, a mold release agent, a coloring agent In addition, additives such as fillers, charge control agents, emulsifiers, and dispersants can be optionally blended.

-Electrophotographic materials-
The electrophotographic material has at least a toner image-receiving layer as the image recording layer on the support, and has other layers appropriately selected as necessary. Each of these layers may have a single layer structure or a laminated structure.

[Toner image receiving layer]
The toner image receiving layer is a layer for receiving color toner and black toner and forming an image. The toner image-receiving layer receives toner for forming an image from a developing drum or an intermediate transfer body by (static) electricity, pressure, etc. in a transfer process in an image forming apparatus, and is fixed by heat, pressure, etc. in a fixing process. Has the function of

The light transmittance of the toner image-receiving layer is preferably 78% or less, more preferably 73% or less, and still more preferably 72% or less, from the viewpoint of making the electrophotographic material feel like a photograph.
Here, the light transmittance is separately measured by forming a coating film having the same thickness on a polyethylene terephthalate film (100 μm), and using the direct reading haze meter (HGM-2DP, manufactured by Suga Test Instruments Co., Ltd.). can do.

The 180 degree peel strength from the fixing member of the image forming apparatus at the fixing temperature of the toner image receiving layer is preferably 0.1 N / 25 mm or less, and more preferably 0.041 N / 25 mm or less. The 180 degree peel strength can be measured according to the method described in JIS K6887 using the surface material of the fixing member.
The toner image receiving layer preferably has high whiteness. The whiteness is preferably 85% or more as measured by the method defined in JIS P 8123. Further, in the wavelength range of 440 nm to 640 nm, the spectral reflectance is preferably 85% or more, and the difference between the maximum spectral reflectance and the minimum spectral reflectance in the same wavelength region is preferably within 5%. Furthermore, the spectral reflectance is preferably 85% or more in the wavelength region of 400 nm to 700 nm, and the difference between the maximum spectral reflectance and the minimum spectral reflectance in the same wavelength region is more preferably within 5%.
As the said whiteness of the toner image-receiving layer, specifically, in ^{CIE 1976 (L * a * b} *) color space, ^{L *} value is preferably 80 or more, more preferably 85 or more, more preferably 90 or more . The white color is preferably as neutral as possible. As a white color, in the L ^* a ^* b ^* space, the value of (a ^* ) ² + (b ^* ) ² is preferably 50 or less, more preferably 18 or less, and even more preferably 5 or less.

  The toner image receiving layer preferably has high gloss after image formation. As the glossiness, the 45 ° glossiness is preferably 60 or more and 110 or less, and the lower limit value is more preferably 75 or more, and further preferably 90 or more in the entire region from white without toner to black having the maximum density. .

When the glossiness exceeds 110, it becomes a metallic luster, which is not preferable as an image quality.
In addition, the said glossiness can be measured based on JISZ8741.

The toner image receiving layer preferably has high smoothness after fixing. As the smoothness, the arithmetic average roughness (Ra) is preferably 3 μm or less, more preferably 1 μm or less, and even more preferably 0.5 μm or less in the entire region from white without toner to black having the maximum density.
The arithmetic average roughness can be measured based on JIS B 0601, B 0651, and B 0652.

The toner image-receiving layer preferably has a physical property of one item in the following items, more preferably has a physical property of a plurality of items, and further preferably has a physical property of all items.
(1) Tm (melting temperature) of the toner image-receiving layer is preferably 30 ° C. or higher, and preferably Tm + 20 ° C. or lower of the toner.
(2) The temperature at which the viscosity of the toner image-receiving layer becomes 1 × 10 ⁵ cp is preferably 40 ° C. or higher, and is preferably lower than that of the toner.
(3) The storage elastic modulus (G ′) at the fixing temperature of the toner image receiving layer is 1 × 10 ² to 1 × 10 ⁵ Pa, and the loss elastic modulus (G ″) is 1 × 10 ² to 1 × 10 ⁵ Pa. preferable.
(4) The loss tangent (G ″ / G ′), which is the ratio of the loss elastic modulus (G ″) at the fixing temperature of the toner image-receiving layer and the storage elastic modulus (G ′), is preferably from 0.01 to 10.
(5) The storage elastic modulus (G ′) at the fixing temperature of the toner image-receiving layer is preferably −50 to +2500 with respect to the storage elastic modulus (G ′) at the fixing temperature of the toner.
(6) The inclination angle of the molten toner on the toner image-receiving layer is preferably 50 degrees or less, and more preferably 40 degrees or less.
The toner image-receiving layer satisfies the physical properties disclosed in Japanese Patent No. 2788358, Japanese Patent Application Laid-Open No. 7-248637, Japanese Patent Application Laid-Open No. 8-305067, Japanese Patent Application Laid-Open No. 10-239889, and the like. preferable.

The toner image-receiving layer preferably has a surface electrical resistance in the range of 1 × 10 ⁶ to 1 × 10 ¹⁵ Ω / cm ² (under conditions of 25 ° C. and 65% RH).

If the surface resistance is less than 1 × 10 ⁶ Ω / cm ² , the toner amount when the toner is transferred to the toner image-receiving layer is not sufficient, and the density of the resulting toner image tends to be low. On the other hand, if the surface electrical resistance exceeds 1 × 10 ¹⁵ Ω / cm ² , an excessive charge is generated during transfer, the toner is not sufficiently transferred, the image density is low, and the electrophotographic image receiving sheet is handled. It becomes electrostatically charged inside and dust tends to adhere to it. Misfeeds, double feeds, discharge marks, toner transfer missing, etc. may occur during copying.
The surface electrical resistance is measured in accordance with JIS K 6911. The sample is conditioned for 8 hours or more in an environment of a temperature of 20 ° C. and a humidity of 65%, and R8340 manufactured by Advantest Corporation is used in the same environment. In addition, it can be obtained by performing measurement after energizing for 1 minute under the condition of an applied voltage of 100V.

  The toner image receiving layer is preferably the resin coating layer. The resin coating layer as the toner image-receiving layer contains at least a toner image-receiving layer polymer and, if necessary, other components.

<Polymer for toner image-receiving layer>
The polymer for the toner image-receiving layer may satisfy the above-mentioned physical properties by using two or more kinds of the polymers in combination as long as the above-mentioned physical properties of the toner-image-receiving layer can be satisfied in a state where the toner image-receiving layer is formed. In addition, the polymer alone may satisfy the above-described physical properties of the toner image-receiving layer.

  Further, the polymer for the toner image-receiving layer preferably has a molecular weight larger than that of the thermoplastic resin used in the toner. However, the molecular weight described above is not necessarily preferable depending on the relationship between the thermoplastic resin used in the toner and the thermodynamic characteristics of the toner image-receiving layer polymer. For example, when the softening temperature of the toner image-receiving layer polymer is higher than that of the thermoplastic resin used in the toner, it is preferable that the molecular weight is the same or the resin used in the toner image-receiving layer is smaller. There is a case.

  The toner image-receiving layer polymer is preferably a mixture of resins having the same composition and different average molecular weights. As the relationship with the molecular weight of the thermoplastic resin used in the toner, the relationship disclosed in JP-A-8-334915 is preferable. Further, the molecular weight distribution of the toner image-receiving layer polymer is preferably wider than the molecular weight distribution of the thermoplastic resin used in the toner. Examples of the polymer for the toner image-receiving layer include JP-A-5-127413, JP-A-8-194394, JP-A-8-334915, JP-A-8-334916, and JP-A-9-171265. Those satisfying the physical properties disclosed in JP-A-10-221877 are preferred.

The toner image-receiving layer polymer preferably has the following characteristics (1) to (5) with respect to the intermediate layer polymer described later.
(1) The softening temperature (Ts) of the toner image-receiving layer polymer is 10 ° C. or more, particularly preferably 20 ° C. or more higher than that of the later-described intermediate layer polymer. Thus, glossiness can be controlled by adjusting the softening temperature. In addition, the measurement of a softening temperature can be performed by the method prescribed | regulated to JISK7210, for example.
(2) The T1 / 2 (1/2 method softening point) of the toner image-receiving layer polymer is 10 ° C. or higher, particularly preferably 20 ° C. or higher, higher than that of the intermediate layer polymer described later. Thus, glossiness can be controlled by adjusting the 1/2 method softening point.
(3) The Tfb (outflow start temperature) of the toner image-receiving layer polymer is 10 ° C. or higher, particularly preferably 20 ° C. or higher, than that of the intermediate layer polymer described later. The glossiness can be controlled by adjusting Tfb in this way.
(4) The viscosity at the fixing temperature of the toner image-receiving layer polymer is 3 times or more, particularly preferably 10 times or more higher than that of the intermediate layer polymer described later. Thus, glossiness can be controlled by adjusting the viscosity.
(5) The storage elastic modulus (G ′) at the fixing temperature of the toner image-receiving layer polymer is 3 times or more, particularly preferably 10 times or more higher than that of the intermediate layer polymer described later. Thus, glossiness can be controlled by adjusting the storage elastic modulus (G ′).
(6) The loss elastic modulus (G ″) at the fixing temperature of the toner image-receiving layer polymer is 3 times or more, particularly preferably 10 times or more higher than that of the intermediate layer polymer described later. Glossiness can be controlled by adjusting the rate (G ″).
Further, the number average molecular weight of the toner image-receiving layer polymer is preferably, for example, 1000 to 100,000, particularly preferably 1,000 to 10,000, smaller than that of the intermediate layer polymer described later. By adjusting in this way, glossiness can be controlled.
Further, the molecular weight distribution of the toner image-receiving layer polymer is preferably 0.2 to 5 narrower than that of the intermediate layer polymer described later, for example. By adjusting in this way, glossiness can be controlled.

  The polymer for the toner image-receiving layer is not particularly limited as long as it can be deformed under temperature conditions such as fixing and can receive the toner, and can be appropriately selected according to the purpose. A resin similar to the above binder resin is preferred. As the toner image-receiving layer polymer, since the toner uses a copolymer resin such as polyester resin, styrene, styrene-butyl acrylate, for example, polyester resin, styrene-acrylate copolymer, styrene- Suitable examples include thermoplastic resins such as methacrylic acid ester copolymers.

  Specific examples of the thermoplastic resin include those exemplified as the resin coating layer for forming the image recording layer, resins having ester bonds, polyurethane resins, polyamide resins, polysulfone resins, polyvinyl chloride resins, etc. Examples include polyvinyl butyral, polycaprolactone resin, polyolefin resin, and the like.

  The toner image-receiving layer polymer may be used alone or in combination of two or more thereof. In addition to these, a mixture thereof, a copolymer thereof, or the like may be used. .

  The polymer for the toner image-receiving layer is excellent in environmental suitability and workability because (i) the organic solvent is not discharged in the coating and drying step. (Ii) Many release agents such as wax are difficult to dissolve in a solvent at room temperature, and are often dispersed in a solvent (water, organic solvent) in advance. In addition, the water dispersion form is more stable and more suitable for the manufacturing process. Further, in the case of aqueous coating, the wax tends to bleed on the surface during the coating and drying process, and the effects of the release agent (offset resistance, adhesion resistance, etc.) can be easily obtained. For this reason, water-based resins such as water-dispersible polymers and water-soluble polymers are preferably used.

  The water-based resin is not particularly limited in terms of its composition, bond structure, molecular structure, molecular weight, molecular weight distribution, form, etc., as long as it is either a water-dispersible polymer or a water-soluble polymer. Examples of the water-based group of the polymer include a sulfonic acid group, a hydroxyl group, a carboxylic acid group, an amino group, an amide group, and an ether group.

Examples of the water-dispersible polymer include resins, emulsions, copolymers, mixtures, and cation-modified products in which the polymers (1) to (9) in the resin coating layer of the image recording layer are dispersed in water. It selects suitably from 2 or more types can be combined.
As the water-dispersible polymer, an appropriately synthesized product or a commercially available product may be used. Examples of the commercially available products include polyester-based water-dispersible polymers such as Toyobo Co., Ltd.'s Bironal series, Takamatsu Yushi Co., Ltd. Pes Resin A series, Kao Corporation's Tufton UE series, Nippon Synthetic Chemical Co., Ltd. Examples include the Polyester WR series manufactured by Kogyo Co., Ltd., and the erière series manufactured by Unitika Ltd. Examples of the acrylic water-dispersible polymer include Hiros XE, KE, PE series manufactured by Seiko Chemical Industry Co., Ltd., and Jurimer ET series manufactured by Nippon Pure Chemical Co., Ltd.

The water-dispersible emulsion is not particularly limited as long as the volume average particle diameter is 20 nm or more, and can be appropriately selected according to the purpose. For example, water-dispersible polyurethane emulsion, water-dispersible polyester emulsion, Emulsions, styrene-butadiene emulsions, nitrile-butadiene emulsions, butadiene emulsions, vinyl chloride emulsions, vinylpyridine-styrene-butadiene emulsions, polybutene emulsions, polyethylene emulsions, vinyl acetate emulsions, ethylene-vinyl acetate emulsions Emulsions, vinylidene chloride emulsions, methyl methacrylate-butadiene emulsions and the like can be mentioned. Among these, a water dispersible polyester emulsion is particularly preferable.
The water-dispersible polyester emulsion is preferably a self-dispersing water-based polyester emulsion, and among them, a carboxyl group-containing self-dispersing water-based polyester resin emulsion is particularly preferable. Here, the self-dispersing aqueous polyester emulsion means an aqueous emulsion containing a polyester resin that can be self-dispersed in an aqueous solvent without using an emulsifier or the like. The carboxyl group-containing self-dispersing aqueous polyester resin emulsion means an aqueous emulsion containing a carboxyl resin as a hydrophilic group and containing a polyester resin that can be self-dispersed in an aqueous solvent.

The self-dispersing water-dispersible polyester emulsion preferably satisfies the following characteristics (1) to (4). Since this is a self-dispersion type that does not use a surfactant, it has low hygroscopicity even in a high humidity atmosphere, and there is little decrease in the softening point due to moisture, and it is possible to suppress occurrence of offset at the time of fixing and adhesion failure between sheets at the time of storage. Moreover, since it is water-based, it is excellent in environmental performance and workability. In addition, since a polyester resin with a high cohesive energy and a molecular structure is used, it has a sufficient hardness in the storage environment, but it becomes a low elasticity (low viscosity) molten state in the electrophotographic fixing process, and the toner receives an image. Sufficient image quality can be achieved by embedding in the layer.
(1) The number average molecular weight (Mn) is preferably 5000 to 10,000, and more preferably 5000 to 7000.
(2) The molecular weight distribution (weight average molecular weight / number average molecular weight) is preferably 4 or less, and more preferably Mw / Mn ≦ 3.
(3) The glass transition temperature (Tg) is preferably 40 to 100 ° C, more preferably 50 to 80 ° C.
(4) The volume average particle diameter is preferably 20 to 200 nm, more preferably 40 to 150 nm.
The content of the water-dispersible emulsion in the toner image-receiving layer is preferably 10 to 90% by mass, and more preferably 10 to 70% by mass.

The water-soluble polymer is not particularly limited as long as the weight average molecular weight (Mw) is 400,000 or less, and can be appropriately selected according to the purpose. For example, polyvinyl alcohol, carboxy-modified polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, cellulose sulfate, polyethylene oxide, gelatin, cationized starch, casein, sodium polyacrylate, styrene-maleic anhydride copolymer Examples thereof include sodium combined sodium and sodium polystyrene sulfonate. Among these, polyethylene oxide is preferable.
Commercially available products of the water-soluble polymer include water-soluble polyesters plus various coats manufactured by Kureai Chemical Industry Co., Ltd., Finetex ES series manufactured by Dainippon Ink and Chemicals, and Nippon Pure Chemical Co., Ltd. as water-soluble acrylic. Jurimer AT series, Dainippon Ink and Chemicals Finetex 6161, K-96; Seiko Chemical Industry Co., Ltd. high loss NL-1189, BH-997L, etc. are mentioned.
Examples of the water-soluble polymer include Research Disclosure No. 17,643, page 26, Research Disclosure No. 18,716, page 651, Research Disclosure No. 307,105, pages 873-874, and JP-A 64- The thing described in 13546 gazette is mentioned.

The content of the water-soluble polymer in the toner image-receiving layer is not particularly limited and can be appropriately selected according to the purpose, and is preferably 0.5 to ² g / m ² .

  Although the said thermoplastic resin can also be used together with another polymer material, in that case, generally it is used so that content may become larger than another polymer material.

  In the toner image-receiving layer, at least one of the water-dispersible emulsion and the water-soluble polymer may be used alone, or both may be used in combination.

The adsorption amount of the water-soluble polymer in the toner image-receiving layer coating solution using the water-dispersible emulsion and the water-soluble polymer is preferably less than 2% by mass.
When the adsorption amount of the water-soluble polymer exceeds 2% by mass, the image-receiving layer coating solution containing the water-dispersible emulsion and the water-soluble polymer may be aggregated.
The amount of the water-soluble polymer adsorbed is determined by mixing the water-dispersible emulsion and the water-soluble polymer (water-dispersible emulsion: water-soluble polymer = 100: 17 (mass ratio)) in the supernatant after centrifugation. The amount of water-soluble polymer (polyethylene oxide) dissolved in the solution can be quantified by NMR, and the amount of polyethylene oxide adsorbed (mass%) can be determined from the amount of polyethylene oxide added. In addition, when the said adsorption amount is 2-5 mass%, depletion aggregation has arisen, and when the said adsorption amount is 30 mass% or more, it means that the aggregation by adsorption | suction or bridge | crosslinking has arisen.

  When the water-dispersible emulsion and the water-soluble polymer are used in combination, the mass ratio of the water-dispersible emulsion and the water-soluble polymer (water-dispersible emulsion: water-soluble polymer) is 1: 0.01 to 1. Preferably, 1: 0.1-1 is more preferable.

  The content of the toner image-receiving layer polymer in the toner image-receiving layer is preferably 10% by mass or more, more preferably 30% by mass or more, still more preferably 50% by mass or more, and particularly preferably 50 to 90% by mass.

<Other ingredients>
Examples of the other components contained in the toner image-receiving layer include release agents, plasticizers, colorants, fillers, cross-linking agents, charge control agents, and other additives.

The release agent is blended in the toner image receiving layer in order to prevent the toner image receiving layer from being offset. The release agent used in the present invention is melted by heating at the fixing temperature, deposited on the surface of the toner image-receiving layer, unevenly distributed on the surface of the toner image-receiving layer, and further cooled and solidified to be the surface of the toner image-receiving layer. As long as it forms a layer of a release agent material, the type is not particularly limited and can be appropriately selected according to the purpose.
Examples of the release agent include at least one selected from a silicone compound, a fluorine compound, a wax, and a matting agent.

  As the mold release agent, for example, compounds described in Sachishobo "Revised Wax Properties and Applications", a silicone handbook published by Nikkan Kogyo Shimbun, Ltd. can be used. Also, Japanese Patent Publication No. 59-38581, Japanese Patent Publication No. 4-32380, Japanese Patent No. 2838498, Japanese Patent No. 2949558, Japanese Patent Application Laid-Open No. 50-117433, Japanese Patent Application Laid-Open No. 52-52640, Japanese Patent Application Laid-Open No. 57-148755, JP 61-62056, JP 61-62057, JP 61-118760, JP 2-42451, JP 3-41465, JP 4-212175, JP 4-214570. JP-A-4-263267, JP-A-5-34966, JP-A-5-119514, JP-A-6-59502, JP-A-6-161150, JP-A-6-175396, JP-A-6-219040. JP-A-6-230600, JP-A-6-295093, JP-A-7-36210, JP-A-7-43940, JP-A-7-56387. JP-A-7-56390, JP-A-7-64335, JP-A-7-199681, JP-A-7-223362, JP-A-7-287413, JP-A-8-184992, JP-A-8-227180, Special Kaihei 8-248671, JP-A-8-248799, JP-A-8-248801, JP-A-8-278663, JP-A-9-152727, JP-A-9-160278, JP-A-9-185181, JP-A-9-185181 No. 9-319139, JP-A-9-319143, JP-A-10-20549, JP-A-10-48889, JP-A-10-198069, JP-A-10-207116, JP-A-11-2917, JP-A-11-11. -44969, JP-A-11-65156, JP-A-11-73049, JP-A-11-194542 Silicone compound used in the toner, fluorine compounds or waxes (excluding natural wax) can also be preferably used that. Further, a plurality of these compounds can be used in combination.

  Examples of the silicone compound include silicone oil, silicone rubber, silicone fine particles, silicone-modified resin, and reactive silicone compound.

Examples of the silicone oil include non-modified silicone oil, amino-modified silicone oil, carboxy-modified silicone oil, carbinol-modified silicone oil, vinyl-modified silicone oil, epoxy-modified silicone oil, polyether-modified silicone oil, silanol-modified silicone oil, Examples include methacryl-modified silicone oil, mercapto-modified silicone oil, alcohol-modified silicone oil, alkyl-modified silicone oil, and fluorine-modified silicone oil.
Examples of the silicone-modified resin include olefin resin, polyester resin, vinyl resin, polyamide resin, cellulose resin, phenoxy resin, vinyl chloride-vinyl acetate copolymer resin, urethane resin, acrylic resin, styrene-acrylic copolymer resin, or Examples include resins obtained by modifying these copolymer resins with silicone.

  The fluorine compound is not particularly limited and may be appropriately selected depending on the purpose. For example, fluorine oil, fluorine rubber, fluorine-modified resin, fluorine sulfonic acid compound, fluorosulfonic acid, fluoric acid compound or a salt thereof, An inorganic fluoride etc. are mentioned.

The wax can be roughly classified into natural wax and synthetic wax.
The natural wax is preferably at least one selected from plant waxes, animal waxes, mineral waxes and petroleum waxes, and among these, plant waxes are particularly preferable. The natural wax is particularly preferably a water-dispersed wax from the viewpoint of compatibility when a water-based resin is used as the polymer for the toner image-receiving layer.

There is no restriction | limiting in particular as said plant-type wax, It can select suitably from well-known things, A commercial item may be sufficient and what was synthesize | combined suitably may be sufficient. Examples of the plant wax include carnauba wax, castor oil, rapeseed oil, soybean oil, wood wax, cotton wax, rice wax, sugarcane wax, candelilla wax, Japan wax, jojoba oil and the like.
Examples of the commercially available carnauba wax include EMUSTAR-0413 manufactured by Nippon Seiki Co., Ltd., Cellosol 524 manufactured by Chukyo Yushi Co., Ltd., and the like. As a commercial item of the said castor oil, the refined castor oil by Ito Oil Co., Ltd., etc. are mentioned.
Among these, the melting point is 70 in that it can provide an electrophotographic image-receiving sheet that is excellent in offset resistance, adhesion resistance, paper permeability, glossiness, hardly cracks, and can form a high-quality image. Carnauba wax at ˜95 ° C. is particularly preferred.

  There is no restriction | limiting in particular as said animal-type wax, It can select suitably from well-known things, For example, beeswax, lanolin, spermaceti, stew wax (whale oil), wool wax etc. are mentioned.

There is no restriction | limiting in particular as said mineral-type wax, It can select suitably from well-known things, A commercial item may be sufficient and what was synthesize | combined suitably may be sufficient. Examples thereof include montan wax, montan ester wax, ozokerite, ceresin and the like.
Among these, in particular, it has an excellent offset resistance, adhesion resistance, paper permeability, glossiness, is resistant to cracking, and can provide an electrophotographic image-receiving sheet capable of forming a high-quality image. Is particularly preferably a montan wax having a temperature of 70 to 95 ° C.

  There is no restriction | limiting in particular as said petroleum wax, It can select suitably from well-known things, A commercial item may be sufficient and what was synthesize | combined suitably may be sufficient. Examples thereof include paraffin wax, microcrystalline wax, and petrolatum.

The content in the toner image-receiving layer of the natural wax is preferably ^{0.1~4g / m 2, 0.2~2g / m} 2 is more preferable.
When the content is less than 0.1 g / m ² , offset resistance and adhesion resistance may be particularly insufficient. When the content exceeds 4 g / m ² , the amount of wax is excessive and an image is formed. May be inferior in image quality.

  The melting point (° C.) of the natural wax is particularly preferably 70 to 95 ° C. and more preferably 75 to 90 ° C. from the viewpoint of offset resistance and paper passing.

  The synthetic wax is classified into synthetic hydrocarbons, modified waxes, hydrogenated waxes, and other oil-based synthetic waxes. These waxes are preferably water-dispersed waxes in view of compatibility when a water-based thermoplastic resin is used as the thermoplastic resin of the toner image-receiving layer.

Examples of the synthetic hydrocarbon include Fischer-Tropsch wax and polyethylene wax.
Examples of the oil-based synthetic wax include acid amide compounds (such as stearamide) and acid imide compounds (such as phthalic anhydride imide).

  The modified wax is not particularly limited and may be appropriately selected depending on the purpose. Examples thereof include amine-modified wax, acrylic acid-modified wax, fluorine-modified wax, olefin-modified wax, urethane-type wax, and alcohol-type wax. Can be mentioned.

  The hydrogenated wax is not particularly limited and may be appropriately selected depending on the intended purpose.For example, hydrogenated castor oil, castor oil derivative, stearic acid, lauric acid, myristic acid, palmitic acid, behenic acid, sebacic acid, Examples include undecylenic acid, heptylic acid, maleic acid, highly maleated oil, and the like.

  Examples of the matting agent include various known ones. Solid particles used as a matting agent can be classified into inorganic particles and organic particles. Specific examples of the material for the inorganic matting agent include oxides (for example, silicon dioxide, titanium oxide, magnesium oxide, aluminum oxide), alkaline earth metal salts (for example, barium sulfate, calcium carbonate, magnesium sulfate), halogens Silver chloride (for example, silver chloride, silver bromide), glass and the like can be mentioned.

  Examples of the inorganic matting agent include West German Patent No. 2529321, British Patent No. 760775, No. 1260772, U.S. Patent Nos. 1201905, No. 2192241, No. 3053662, No. 3062649, No. 3257206. No. 3322555, No. 3353958, No. 3370951, No. 3411907, No. 3437484, No. 3523022, No. 3615554, No. 3635714, No. 3769020, No. 40212245 And those described in each specification of No. 4029504.

  Examples of the material for the organic matting agent include starch, cellulose ester (for example, cellulose acetate propionate), cellulose ether (for example, ethyl cellulose), and synthetic resin. The synthetic resin is preferably water-insoluble or poorly water-soluble. Examples of the water-insoluble or poorly water-soluble synthetic resin include poly (meth) acrylic acid esters (for example, polyalkyl (meth) acrylate, polyalkoxyalkyl (meth) acrylate, polyglycidyl (meth) acrylate), poly (meth) acrylate. ) Acrylamide, polyvinyl ester (eg, polyvinyl acetate), polyacrylonitrile, polyolefin (eg, polyethylene), polystyrene, benzoguanamine resin, formaldehyde condensation polymer, epoxy resin, polyamide, polycarbonate, phenol resin, polyvinylcarbazole, polyvinylidene chloride, etc. Can be mentioned. In addition, you may use the copolymer which combined the monomer used for the above polymer.

In the case of the copolymer, a small amount of hydrophilic repeating units may be contained. Examples of the monomer forming the hydrophilic repeating unit include acrylic acid, methacrylic acid, α, β-unsaturated dicarboxylic acid, hydroxyalkyl (meth) acrylate, sulfoalkyl (meth) acrylate and styrene sulfonic acid.
Examples of the organic matting agent include British Patent No. 1055713, U.S. Patent No. 1,939,213, No. 2221873, No. 2,226,662, No. 2322037, No. 2376005, No. 2391181, No. 2701245, Nos. 2,921,101, 3,079,257, 3,262,782, 3,443,946, 3,516,832, 3,539,344, 3,591,379, 3,754,924, 3,767,448 Examples thereof include those described in Japanese Utility Model Publication Nos. 49-106821 and 57-14835.
Two or more kinds of solid particles may be used in combination. The average particle size of the solid particles is, for example, 1 to 100 μm, preferably 4 to 30 μm. The amount of solid particles used is 0.01 to 0.5 g / m ² , preferably 0.02 to 0.3 g / m ² .

The melting point (° C.) of the release agent is preferably 70 to 95 ° C., and more preferably 75 to 90 ° C., particularly in terms of offset resistance and paper passing properties.
In addition, as a release agent added to the toner image-receiving layer of the present invention, these derivatives, oxides, purified products, and mixtures can be used. Moreover, these may have a reactive substituent.

The content of the release agent is preferably 0.1 to 10% by mass, more preferably 0.3 to 8.0% by mass, and 0.5 to 5.0% by mass based on the mass of the toner image-receiving layer. Is more preferable.
When the content is less than 0.1% by mass, the offset resistance and the adhesion resistance may be insufficient. When the content exceeds 10% by mass, the amount of the release agent is too large. Image quality may be degraded.

-Plasticizer-
There is no restriction | limiting in particular as said plasticizer, The plasticizer for well-known resin can be suitably selected according to the objective. The plasticizer has a function of adjusting the flow or softening of the toner image receiving layer by heat or pressure when fixing the toner.
Examples of the plasticizer include “Chemical Handbook” (edited by the Chemical Society of Japan, Maruzen), “Plasticizer—its theory and application” (written by Koichi Murai, Koshobo), “Research on plasticizers”, “Research on plasticizers” "Lower" (edited by Polymer Chemistry Association), "Handbook Rubber and Plastic Compounded Chemicals" (edited by Rubber Digest Co., Ltd.), etc.

Examples of the plasticizer include those described as high-boiling organic solvents and thermal solvents. For example, JP-A-59-83154, JP-A-59-178451, JP-A-59-178453, JP 59-178454, JP 59-178455, JP 59-178457, JP 62-174754, JP 62-245253, JP 61-209444, JP Described in JP-A-61-200538, JP-A-62-2145, JP-A-62-2348, JP-A-62-2247, JP-A-62-136646, JP-A-2-235694, etc. Esters such as phthalic acid esters, phosphoric acid esters, fatty acid esters, abietic acid esters, adipic acid esters, sebacic acid esters, Gelaic acid esters, benzoic acid esters, butyric acid esters, epoxidized fatty acid esters, glycolic acid esters, propionic acid esters, trimellitic acid esters, citric acid esters, sulfonic acid esters, carboxylic acid esters Succinic acid esters, maleic acid esters, fumaric acid esters, phthalic acid esters, stearic acid esters, etc.), amides (for example, fatty acid amides, sulfoamides, etc.), ethers, alcohols, lactones And compounds such as polyethyleneoxys.
These plasticizers can be used by mixing with a resin.

Further, as the plasticizer, a relatively low molecular weight polymer can be used. The molecular weight of the plasticizer is preferably lower than the molecular weight of the binder resin to be plasticized, and the molecular weight is preferably 15000 or less, more preferably 5000 or less. In the case of a polymer plasticizer, the polymer is preferably the same type as the binder resin to be plasticized. For example, a low molecular weight polyester is preferable for plasticizing a polyester resin. Furthermore, oligomers can also be used as plasticizers.
In addition to the compounds listed above, commercially available products include, for example, Adekasizer PN-170, PN-1430 (all manufactured by Asahi Denka Kogyo Co., Ltd.), PARAPLEX-G-25, G-30, G-40 (any C.P.HALL), ester gum 8L-JA, ester R-95, pentalin 4851, FK115, 4820, 830, Louisol 28-JA, picorastic A75, picotex LC, crystallx 3085 (all rationalized) Hercules).

The plasticizer is used for stress and strain generated when toner particles are embedded in the toner image-receiving layer (physical strain such as elastic force and viscosity, strain due to material balance of molecules, binder main chain, pendant portion, etc.). Can be used arbitrarily to alleviate.
The plasticizer may be in a micro-dispersed state in the toner image-receiving layer, in a micro-phase-separated state in a sea island shape, or in a state sufficiently mixed and dissolved with other components such as a binder. .
The content of the plasticizer in the toner image-receiving layer is preferably 0.001 to 90% by mass, more preferably 0.1 to 60% by mass, and still more preferably 1 to 40% by mass.
The plasticizer adjusts smoothness (improves transportability due to reduced frictional force), improves fixing unit offset (detachment of toner and layers from the fixing unit), adjusts curl balance, and adjusts charging (toner electrostatic image It may be used for the purpose of forming).

-Colorant-
There is no restriction | limiting in particular as said colorant, According to the objective, it can select suitably, A fluorescent whitening agent, a white pigment, a colored pigment, dye, etc. are mentioned.
The fluorescent brightening agent is not particularly limited as long as it is a known compound that absorbs in the near ultraviolet region and emits fluorescence at 400 to 500 nm, and can be appropriately selected from known compounds. Preferable examples include compounds described in “The Chemistry of Synthetic Dies” edited by Veen Rataraman, Vol. The fluorescent whitening agent may be a commercially available product or an appropriately synthesized product, for example, a stilbene compound, a coumarin compound, a biphenyl compound, a benzoxazoline compound, or a naphthalimide compound. , Pyrazoline compounds, carbostyryl compounds, and the like. Examples of the commercially available products include white full fur PSN, PHR, HCS, PCS, B (all manufactured by Sumitomo Chemical Co., Ltd.), UVITEX-OB (manufactured by Ciba-Geigy), and the like.

  There is no restriction | limiting in particular as said white pigment, Although it can select suitably according to the objective from well-known things, For example, inorganic pigments, such as a titanium oxide and a calcium carbonate, are mentioned.

The colored pigment is not particularly limited and may be appropriately selected from known ones according to the purpose. Examples thereof include various pigments, azo pigments, and many described in JP-A-63-44653. Examples thereof include cyclic pigments, condensed polycyclic pigments, lake pigments, and carbon black.
Examples of the azo pigment include azo lake (eg, Carmine 6B, Red 2B, etc.), insoluble azo pigment (eg, monoazo yellow, disazo yellow, pyrazolo orange, vulcan orange, etc.), condensed azo pigment (eg, chromophthal yellow, chromo). Phthared).
Examples of the polycyclic pigment include phthalocyanine pigments such as copper phthalocyanine blue and copper phthalocyanine green.
Examples of the condensed polycyclic pigment include dioxazine pigments (such as dioxazine violet), isoindolinone pigments (such as isoindolinone yellow), selenium pigments, perylene pigments, perinone pigments, and thioindigo pigments. Can be mentioned.
Examples of the lake pigment include malachite green, rhodamine B, rhodamine G, and Victoria blue B.
Examples of the inorganic pigment include oxides (for example, titanium dioxide, bengara, etc.) sulfates (for example, precipitated barium sulfate), carbonates (for example, precipitated calcium carbonate), oxalates (for example, water-containing materials) Succinate, anhydrous succinate, etc.), metal powders (for example, aluminum powder, bronze powder, zinc dust, yellow lead, bitumen), and the like.
These may be used alone or in combination of two or more.

There is no restriction | limiting in particular as said dye, According to the objective, it can select suitably according to the objective, For example, an anthraquinone type compound, an azo type compound, etc. are mentioned. These may be used alone or in combination of two or more.
Examples of water-insoluble dyes include vat dyes, disperse dyes, and oil-soluble dyes. Examples of the vat dyes include C.I. I. Vat violet 1, C.I. I. Vat violet 2, C.I. I. Vat violet 9, C.I. I. Vat violet 13, C.I. I. Vat violet 21, C.I. I. Vat Blue 1, C.I. I. Vat Blue 3, C.I. I. Vat Blue 4, C.I. I. Vat Blue 6, C.I. I. Vat Blue 14, C.I. I. Vat Blue 20, C.I. I. Vat blue 35 etc. are mentioned. Examples of the disperse dye include C.I. I. Dispers Violet 1, C.I. I. Disperse Violet 4, C.I. I. Disperse Violet 10, C.I. I. Disperse Blue 3, C.I. I. Disperse Blue 7, C.I. I. Disperse Blue 58 etc. are mentioned. Examples of the oil-soluble dye include C.I. I. Solvent Violet 13, C.I. I. Solvent Violet 14, C.I. I. Solvent Violet 21, C.I. I. Solvent Violet 27, C.I. I. Solvent Blue 11, C.I. I. Solvent Blue 12, C.I. I. Solvent Blue 25, C.I. I. Solvent Blue 55 etc. are mentioned.
In addition, a colored coupler used in silver salt photography can also be suitably used.

Of the colorant, the content in the toner image-receiving layer is preferably ^{0.1~8g / m 2, 0.5~5g / m} 2 is more preferable.
When the content of the colorant is less than 0.1 g / m ² , the light transmittance in the toner image-receiving layer may be increased. When the content exceeds 8 g / m ² , handling properties such as cracking and adhesion resistance are improved. May be inferior.
Among the colorants, the amount of the pigment added is preferably 40% by mass or less, more preferably 30% by mass or less, and further preferably 20% by mass or less based on the mass of the thermoplastic resin constituting the toner image receiving layer. preferable.

As said filler, an organic or inorganic filler is mentioned, A well-known thing can be used as a reinforcing agent for binder resin, a filler, and a reinforcing material. The filler should be selected with reference to "Handbook Rubber / Plastic Compounding Chemicals" (edited by Rubber Digest Co., Ltd.), "New Edition Plastic Compounding Agent Basics and Applications" (Taiseisha), "Filler Handbook" (Taiseisha), etc. Can do.
As the filler, an inorganic filler or an inorganic pigment can be used. Examples of the inorganic filler or inorganic pigment include silica, alumina, titanium dioxide, zinc oxide, zirconium oxide, mica-like iron oxide, lead white, lead oxide, cobalt oxide, strontium chromate, molybdenum-based pigment, smectite, magnesium oxide, Examples include calcium oxide, calcium carbonate, and mullite. Among these, silica and alumina are particularly preferable. These may be used alone or in combination of two or more. The filler preferably has a small particle size. If the particle size is large, the surface of the toner image-receiving layer tends to be roughened.

  The silica includes spherical silica and amorphous silica. The silica can be synthesized by a dry method, a wet method, or an airgel method. The surface of the hydrophobic silica particles may be surface-treated with a trimethylsilyl group or silicone. As the silica, colloidal silica is preferable. The silica is preferably porous.

The alumina includes anhydrous alumina and alumina hydrate. As the crystal form of the anhydrous alumina, α, β, γ, δ, ζ, η, θ, κ, ρ, or χ can be used, and alumina hydrate is preferable to anhydrous alumina. As the alumina hydrate, monohydrate or trihydrate can be used. The monohydrate includes pseudo boehmite, boehmite and diaspore. The trihydrate includes dibsite and bayerite. The alumina is preferably porous.
The alumina hydrate can be synthesized by a sol-gel method in which ammonia is added to an aluminum salt solution to precipitate or a method in which an alkali aluminate is hydrolyzed. The anhydrous alumina can be obtained by dehydrating alumina hydrate by heating.

  The amount of the filler added is preferably 5 to 2000 parts by mass with respect to 100 parts by mass of the dry mass of the binder of the toner image receiving layer.

The cross-linking agent can be blended in order to adjust the storage stability and thermoplasticity of the toner image-receiving layer. As the cross-linking agent, a compound having two or more known reactive groups in the molecule as epoxy groups, isocyanate groups, aldehyde groups, active halogen groups, active methylene groups, acetylene groups and the like as reactive groups is used.
As the crosslinking agent, a compound having two or more groups capable of forming a bond by a hydrogen bond, an ionic bond, a coordinate bond, or the like can be used.
As the crosslinking agent, for example, a known compound can be used as a coupling agent for resin, a curing agent, a polymerization agent, a polymerization accelerator, a coagulant, a film-forming agent, a film-forming auxiliary, and the like. Examples of the coupling agent include chlorosilanes, vinyl silanes, epoxy silanes, aminosilanes, alkoxyaluminum chelates, titanate coupling agents, etc., and “Handbook Rubber / Plastic Compounding Chemicals” (edited by Rubber Digest Co., Ltd.). ) Etc. can be used.

The toner image receiving layer preferably contains a charge adjusting agent in order to adjust transfer or adhesion of the toner, or to prevent charging adhesion of the toner image receiving layer.
There is no restriction | limiting in particular as said charge control agent, Conventionally well-known various charge control agents can be used suitably according to the objective. The charge control agent is not particularly limited and may be appropriately selected depending on the intended purpose. For example, a surfactant such as a cationic surfactant, an anionic surfactant, an amphoteric surfactant, or a nonionic surfactant. In addition to the agent, a polymer electrolyte, a conductive metal oxide, and the like can be used. Specifically, quaternary ammonium salts, polyamine derivatives, cation-modified polymethyl methacrylate, cationic antistatic agents such as cation-modified polystyrene, anionic antistatic agents such as alkyl phosphates and anionic polymers, fatty acid esters, polyethylene oxide Nonionic antistatic agents such as
In the case where the toner has a negative charge, for example, a cation or a nonion is preferable as the charge adjusting agent blended in the toner image receiving layer.
Examples of the conductive metal oxide include ZnO, TiO ₂ , SnO ₂ , Al ₂ O ₃ , In ₂ O ₃ , SiO ₂ , MgO, BaO, and MoO ₃ . These may be used alone or in combination of two or more. The conductive metal oxide may further contain (doping) a different element, for example, Al, In, etc. with respect to ZnO, Nb, Ta, etc. with respect to TiO ₂ , and SnO _{2 with} respect to SnO ₂ . Can contain (doping) Sb, Nb, a halogen element, or the like.

-Other additives-
The material that can be used for the toner image-receiving layer may contain various additives for improving the stability of the output image and improving the stability of the toner image-receiving layer itself. Examples of the additive include various known antioxidants, antioxidants, deterioration inhibitors, ozone deterioration inhibitors, ultraviolet absorbers, metal complexes, light stabilizers, preservatives, fungicides, and the like.

  There is no restriction | limiting in particular as said antioxidant, According to the objective, it can select suitably, For example, a chroman compound, a coumaran compound, a phenol compound (for example, hindered phenol), a hydroquinone derivative, a hindered amine derivative, a spiroindane compound is mentioned. Can be mentioned. The antioxidant is described in JP-A No. 61-159644.

  There is no restriction | limiting in particular as said anti-aging agent, According to the objective, it can select suitably, For example, it describes in "Handbook rubber and plastic compounding chemicals revised 2nd edition" (1993, Rubber Digest company) p76-121. Can be mentioned.

  There is no restriction | limiting in particular as said ultraviolet absorber, According to the objective, it can select suitably, For example, a benzotriazole compound (refer U.S. Pat. No. 3,533,794), 4-thiazolidone compound (U.S. Pat. No. 3,352,681) Benzophenone compounds (see Japanese Patent Application Laid-Open No. Sho 46-2784) and ultraviolet absorbing polymers (see Japanese Patent Application Laid-Open No. Sho 62-260152).

There is no restriction | limiting in particular as said metal complex, According to the objective, it can select suitably, For example, each specification of U.S. Pat. No. 4,241,155, U.S. Pat. No. 4,245,018, U.S. Pat. Those described in JP-A-88256, JP-A-62-174741, JP-A-63-199248, JP-A-1-75568, and JP-A-1-74272 are suitable.
Further, ultraviolet absorbers and light stabilizers described in "Handbook Rubber / Plastic Compounding Chemicals Revised 2nd Edition" (1993, Rubber Digest Co., Ltd.) p122 to 137 can also be suitably used.

  Note that, as described above, known photographic additives can be added to the material that can be used for the toner image-receiving layer, if necessary. Examples of the photographic additive include Research Disclosure Magazine (hereinafter abbreviated as RD) No. 17643 (December 1978), RD No. 18716 (November 1979) and RD No. 307105 (November 1989), and the corresponding parts are summarized in the following table.

  The toner image-receiving layer is provided by applying a coating solution containing the toner image-receiving layer thermoplastic resin on the support with a wire coater or the like and drying. The film forming temperature (MFT) of the thermoplastic resin used in the present invention is preferably room temperature or higher for storage before printing, and preferably 100 ° C. or lower for fixing toner particles.

The toner image-receiving layer, the coating weight after drying, for example, preferably ^{1~20g / m 2, 4~15g / m} 2 is more preferable.
The thickness of the toner image-receiving layer is not particularly limited and may be appropriately selected depending on the intended purpose. More preferably, specifically, 1 to 50 μm is preferable, 1 to 30 μm is more preferable, 2 to 20 μm is further preferable, and 5 to 15 μm is particularly preferable.

[Other layers]
The other layer provided in the electrophotographic material is not particularly limited and may be appropriately selected depending on the intended purpose. For example, a surface protective layer, a back layer, an adhesion improving layer, a cushion layer, an intermediate layer, an undercoat Examples include a layer, a charge control (prevention) layer, a reflection layer, a color adjustment layer, a storage stability improving layer, an adhesion prevention layer, an anti-curl layer, and a smoothing layer.

<Surface protective layer>
The surface protective layer is the toner image-receiving layer for the purpose of protecting the surface of the electrophotographic material, improving storage stability, improving handleability, imparting writability, improving instrument passability, imparting anti-offset property, etc. Can be provided on the surface. The surface protective layer may be a single layer or may be composed of two or more layers. In the surface protective layer, various thermoplastic resins, thermosetting resins, and the like can be used as a binder, and it is preferable to use the same type of resin as the toner image receiving layer. However, thermodynamic characteristics, electrostatic characteristics, and the like do not have to be the same as those of the toner image-receiving layer, and can be optimized.

The surface protective layer preferably contains the particles as a matting agent contained in the toner image receiving layer. In addition, various additives described above that can be used in the toner image-receiving layer can be blended. In particular, the surface protective layer may contain other release agents and the like together with the particles as the matting agent.
The outermost surface layer in the electrophotographic material (for example, a surface protective layer when a surface protective layer is formed) preferably has good compatibility with the toner from the viewpoint of fixability. Specifically, the contact angle with the melted toner is preferably, for example, 0 to 40 degrees.

<Back layer>
In the electrophotographic material, the back layer is provided on the opposite side of the toner image-receiving layer with respect to the support for the purpose of imparting backside output suitability, improving backside output image quality, improving curl balance, and improving device passability. It is preferred that
Although there is no restriction | limiting in particular as a color of the said back layer, When the said electrophotographic material is a double-sided output type image receiving material which forms an image also in a back surface, it is preferable that a back layer is also white. The whiteness and the spectral reflectance are preferably 85% or more like the surface.
In addition, the back layer may have the same configuration as that of the toner image receiving layer for improving the duplex output suitability. In addition to the particles as the matting agent contained in the toner image-receiving layer, various additives described above can be used for the back layer. As such an additive, it is particularly appropriate to blend a charge control agent and the like. The back layer may have a single layer configuration or a stacked configuration of two or more layers.
Further, in order to prevent offset at the time of fixing, when a releasable oil is used for the fixing roller or the like, the back layer may be oil absorbing.

<Adhesion improvement layer>
The adhesion improving layer is preferably formed for the purpose of improving the adhesion between the support and the toner image receiving layer in the electrophotographic material. The above-mentioned various additives can be blended in the adhesion improving layer, and it is particularly preferable to blend a crosslinking agent.

<Cushion layer>
The electrophotographic material is preferably provided with a cushion layer between the adhesion improving layer and the toner image receiving layer in order to improve the acceptability of the toner.

<Intermediate layer>
The intermediate layer is, for example, between the support and the adhesion improving layer, between the adhesion improving layer and the cushion layer, between the cushion layer and the toner image receiving layer, and between the toner image receiving layer and the storage. It can be formed between the property improving layers. In the case of an electrophotographic material comprising the support, the toner image receiving layer, and the intermediate layer, the intermediate layer can be present, for example, between the support and the toner image receiving layer.

The intermediate layer is preferably the resin coating layer. The resin coating layer as the intermediate layer contains at least a polymer for the intermediate layer, and contains various components as necessary.
The polymer for the intermediate layer is not particularly limited as long as it is suitable for use as the coating liquid, and can be appropriately selected. For example, the same resin as the polymer for the toner image receiving layer is used. Among these, the water-soluble polymer and the water-dispersible polymer are preferable, and the self-dispersing water-based polyester emulsion and the water-dispersed acrylic resin are more preferable. Examples of the polymer for the intermediate layer include JP-B-5-127413, JP-A-8-194394, JP-A-8-334915, JP-A-8-334916, JP-A-9-171265, and JP-A-10-221877. Those satisfying the physical properties disclosed in the official gazette and the like are preferably used. As content in the said intermediate | middle layer of the polymer for said intermediate | middle layers, 20 mass% or more is preferable based on the mass of the said intermediate | middle layer, and 30-100 mass% is more preferable.

  As long as the function of the intermediate layer is not impaired, the various components as mentioned in the toner image-receiving layer can be arbitrarily added to the intermediate layer polymer.

  The intermediate layer is prepared, for example, by preparing a coating solution for the intermediate layer and coating it. By using the intermediate layer coating solution, the intermediate layer can be prepared on the support relatively easily. Further, the polymer for the intermediate layer can be impregnated in the thickness direction of the support.

-Heat sensitive material-
The heat-sensitive material has, for example, a structure in which at least a heat-sensitive recording layer is provided as an image recording layer on the support for image-recording material of the present invention. The thermosensitive material etc. which are used in the thermoautochrome system (TA system) which forms are mentioned.

-Sublimation transfer material-
The sublimation transfer material has, for example, a configuration in which an ink layer containing at least a heat-diffusible dye (sublimation dye) is provided as an image recording layer on the support for image recording material of the present invention, Examples include a sublimation transfer method in which a thermal diffusible dye is transferred from an ink layer onto a sublimation transfer sheet by heating with a thermal head.

-Thermal transfer material-
The thermal transfer material has, for example, a configuration in which at least a heat-meltable ink layer is provided as an image recording layer on the image-recording material support of the present invention, and is heated by a heat-sensitive head to form a heat-meltable ink. Examples include a method in which ink is melt-transferred from a layer onto a thermal transfer sheet.

-Heat development material-
As the heat developing material, a structure in which a light and heat sensitive recording layer as described in, for example, JP-A-2002-40643 is provided as an image recording layer on the support for image recording material of the present invention. A visible image can be formed by heating the heat-developable material that has been printed and exposed by a heating method using any one of a heating roller, a heating belt, a plate heater, a thermal head, a laser, and a combination thereof. What can be mentioned.
Further, the image recording material support of the present invention has a structure in which a photothermographic layer as described in, for example, JP-A No. 2004-246026 is provided as an image recording layer. A material capable of forming a visible image by heating the heat-developable material by a heating method using any one of a heating roller, a heating belt, a plate heater, a thermal head, a laser, and a combination thereof. .

-Silver salt photographic materials-
Examples of the silver salt photographic material include an image recording layer that develops at least yellow (Y), magenta (M), and cyan (C) as an image recording layer on the support for image recording material of the present invention. A silver halide photographic system in which color-development, bleach-fixing, water-washing and drying are performed by passing a silver halide photographic sheet that has been baked and exposed while immersing it in a plurality of processing tanks. , Etc.

-Inkjet recording material-
Examples of the ink jet recording material include a liquid ink such as a water-based ink (using a dye or a pigment as a color material) and an oil-based ink as an image recording layer on the support for an image recording material of the present invention, an ordinary temperature, Is a solid and has the color material receiving layer capable of receiving solid ink or the like which is melted and liquefied and used for printing.

−Printing paper−
The image recording material support is also preferably used as printing paper. When used as printing paper, a material having high mechanical strength is preferable from the viewpoint of applying ink or the like by a printing machine.
The printing paper is particularly suitable as offset printing paper, and can be used as letterpress printing paper, gravure printing paper, and electrophotographic paper.

  According to the present invention, it is possible to solve the conventional problems, there is no generation of cracks on the surface even at high temperatures, and a base paper having good smoothness is obtained by performing a calendar process using a roll having an excellent rust prevention effect. It is possible to apply a high speed coating of the thermoplastic resin layer on the surface of the base for the image recording material and the base of the image recording material with little occurrence of small holes (micro dents) after coating the thermoplastic paper layer on the base paper, It is possible to provide a method for producing an image recording material support efficiently and inexpensively.

  Examples of the present invention will be described below, but the present invention is not limited to the following examples.

Example 1
50 mass parts of LBKP made of acacia and 50 parts by mass of LBKP made of aspen were each beaten to 300 ml of Canadian freeness by a disc refiner to prepare a pulp slurry.
Next, 1.3 wt% of cationic starch (manufactured by NSC Japan, CATO304L), 0.15 wt% of anionic polyacrylamide (manufactured by Seiko Chemical Co., Ltd., Polyaclon ST-13) per pulp to the obtained pulp slurry. Alkyl ketene dimer (Arakawa Chemical Co., Ltd., Size Pine K) 0.29% by mass, Epoxidized behenamide 0.29% by mass, and Polyamide polyamine epicumer (Arakawa Chemical Co., Ltd., Arafix 100) 0.32% by mass Then, 0.12% by mass of an antifoaming agent (manufactured by BASF Japan, Afranil MG) was added.

  Next, the prepared pulp slurry was made with a long paper machine, and the felt surface of the web was pressed against a drum dryer through a dryer canvas and dried. Polyvinyl alcohol (manufactured by Kuraray Co., Ltd., KL-118) 5.0% by mass, calcium chloride as an antistatic agent (manufactured by Tokuyama Co., Ltd.) 3.8% by mass, and fluorescent whitening agent (Sumitomo Chemical Co., Ltd.) A solution prepared by dissolving 0.8% by mass of Whiteex BB liquid (manufactured by company) in water was applied to both sides with a size press and dried.

Next, a thermal spray material of tungsten carbide (WC) -cobalt (Co) (WC: 88% by mass, Co: 12% by mass) was sprayed on the roll shell made of SNCM439 (forged steel) at a high speed flame thickness of 150 μm, A roll having a surface layer with a surface roughness of 0.3S was produced.
The obtained roll was brought into contact with the side (front side) of the base paper where the image recording layer was provided at a surface temperature of 350 ° C., while the side of the base paper where the image recording layer was not provided (back side) Soft calendering was performed so as to contact a resin roll having a D hardness of 90 °. The nip linear pressure was 120 kg / cm. Thus, a base paper was prepared. Here, the surface roughness of the roll was measured with a surface roughness meter (manufactured by Tokyo Seimitsu Co., Ltd., Surfcom 120A).
Since the tungsten carbide (WC) -cobalt coated metal roll of Example 1 has a sufficient surface layer thickness of 150 μm, it can be reused by polishing the roll surface again even if the roll surface is damaged. (Can be polished).

  Next, the occurrence of cracks on the roll surface, the occurrence of rust, discoloration of the base paper surface, and abrasion resistance were evaluated as follows. The results are shown in Table 3.

<Occurrence of cracks and peeling on the roll surface>
The occurrence of cracks and peeling on the roll surface after 7 days of use was visually observed with a 1-nip soft calender and evaluated according to the following criteria.
〔Evaluation criteria〕
○: No crack or peeling occurred △: Crack or peeling occurred but not a problem in actual use ×: Crack or peeling occurred, causing a problem in actual use ××: Crack or peeling Frequent and unusable level

<Rust generation on the roll surface>
The state of rust generation on the roll surface after 7 days of use was visually observed with a 1-nip soft calender and evaluated according to the following criteria.
〔Evaluation criteria〕
○: Rust is not generated △: Rust is generated but does not cause a problem in actual use ×: Rust is generated and a problem occurs in actual use ××: Rust is frequently generated and cannot be used

<Discoloration of the base paper surface>
The obtained base paper surface was visually observed for discoloration and evaluated according to the following criteria.
○: No discoloration △: Some discoloration (Available level)
×: Discolored (unusable level)

Next, the base paper after the soft calender treatment was adjusted to a density of 0.96 g / cm ³ with a machine calender, and the Oken type smoothness was measured to find 378 seconds.

  Next, after both surfaces of the obtained base paper were subjected to corona discharge treatment, polyethylene was extruded using a laminator to coat both sides of the base paper with a thickness of 28 μm. At that time, a support having a glossy surface on the front surface was prepared using the cooling roll surface of the laminator forming the front surface polyethylene layer on the side of the base paper on which the image recording layer was provided as a mirror surface.

  Next, the obtained support was subjected to comprehensive evaluation by measuring the number of small holes and the electrical resistance as follows. The results are shown in Table 3.

<Measurement of the number of small holes>
The number of dents called small holes having a diameter of 20 to 100 μm on the glossy surface of the obtained support was measured with a universal projector (20 times). In addition, 100 piece / cm < ² > or less was set as the pass.

<Measurement of electrical resistance>
The electrical resistance of the obtained support was measured with a digital super insulation resistance meter manufactured by Takeda Riken Co., Ltd., and evaluated according to the following criteria.
○: Good △: Normal (Available level)
×: Defect (actually unusable level)

<Abrasion resistance test>
A steel blade having a width of 5 mm was applied to the roll surface at a roll speed of 100 m / min, a load of 2 kg / cm was applied, and the depth of the flaw after 10 hours was measured with a surface roughness meter (Surfcom 120A, manufactured by Tokyo Seimitsu Co., Ltd.). It was measured from the cross-sectional curve.

<Comprehensive evaluation>
All the above evaluation results were integrated and evaluated according to the following criteria.
○: Good △: Normal (actual use possible)
×: Defect (unusable)

(Example 2)
-Production of base paper and support-
In Example 1, as shown in Table 2, a base paper was prepared in the same manner as in Example 1 except that the surface temperature of the roll was changed to 200 ° C. and soft calendering was performed. Layers were formed to produce a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

(Example 3)
-Production of base paper and support-
In Example 1, as shown in Table 2, a base paper was prepared in the same manner as in Example 1 except that the surface temperature of the roll was changed to 250 ° C. and soft calendering was performed. A layer was formed to produce a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

Example 4
-Production of base paper and support-
In Example 1, as shown in Table 2, tungsten carbide (WC) -cobalt (Co) (WC: 88 mass%, Co: 12 mass%) was coated to a thickness of 220 μm, and the surface temperature of the roll A base paper was prepared in the same manner as in Example 1 except that the soft calender treatment was carried out at 350 ° C., and a polyethylene resin layer was formed on both sides of the base paper to prepare a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

(Example 5)
-Production of base paper and support-
In Example 1, as shown in Table 2, tungsten carbide (WC) -cobalt (Co) (WC: 88 mass%, Co: 12 mass%) was coated so as to have a thickness of 50 μm, and the surface temperature of the roll A base paper was prepared in the same manner as in Example 1 except that the soft calender treatment was carried out at 350 ° C., and a polyethylene resin layer was formed on both sides of the base paper to prepare a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

(Example 6)
-Production of base paper and support-
In Example 1, as shown in Table 2, a base paper was prepared in the same manner as in Example 1, except that the surface temperature of the roll was changed to 370 ° C. and soft calendering was performed, and a polyethylene resin was formed on both sides of the base paper. Layers were formed to produce a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

(Example 7)
-Production of base paper and support-
In Example 1, as shown in Table 2, a base paper was prepared in the same manner as in Example 1 except that 3.8% by mass of an alkyltrimethylammonium salt was added as an antistatic agent contained in the surface sizing solution. A polyethylene resin layer was formed on both sides of the base paper to prepare a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

(Example 8)
In Example 1, as shown in Table 2, tungsten carbide-cobalt was changed to tungsten carbide-cobalt chromium, and a roll having a surface layer with a thickness of 150 μm and a surface roughness of 0.3 S was prepared. Except for the calendar treatment, a base paper was prepared in the same manner as in Example 1, and a polyethylene resin layer was formed on both sides of the base paper to prepare a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

Example 9
In Example 1, as shown in Table 2, tungsten carbide-cobalt was changed to tungsten carbide-cobalt-nickel to produce a roll having a surface layer with a thickness of 150 μm and a surface roughness of 0.3 S, and softening was performed using the roll. Except for the calendar treatment, a base paper was prepared in the same manner as in Example 1, and a polyethylene resin layer was formed on both sides of the base paper to prepare a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

(Comparative Example 1)
-Production of base paper and support-
In Example 1, as shown in Table 2, a base paper was prepared in the same manner as in Example 1, except that the surface temperature of the roll was changed to 180 ° C. and soft calendering was performed, and a polyethylene resin was formed on both sides of the base paper. A layer was formed to prepare a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

(Comparative Example 2)
-Production of base paper and support-
In Example 1, as shown in Table 2, an industrial chrome plating is formed on a roll shell so that the thickness is 150 μm and the surface roughness is 0.3 S, and the surface temperature of the roll is changed to 200 ° C. A base paper was prepared in the same manner as in Example 1 except that the treatment was performed, and a polyethylene resin layer was formed on both sides of the base paper to prepare a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

(Comparative Example 3)
-Production of base paper and support-
In Example 1, as shown in Table 2, an industrial chrome plating is formed on a roll shell so that the thickness is 150 μm and the surface roughness is 0.3 S, and the surface temperature of the roll is changed to 350 ° C. A base paper was prepared in the same manner as in Example 1 except that the treatment was performed, and a polyethylene resin layer was formed on both sides of the base paper to prepare a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

(Comparative Example 4)
-Production of base paper and support-
In Example 1, as shown in Table 2, a surface layer was not provided on the roll, and the surface temperature of the roll finished with SNCM439 (forged steel) with a surface roughness of 0.3S was changed to 200 ° C. and soft calendering was performed. Prepared a base paper in the same manner as in Example 1, and formed a polyethylene resin layer on both sides of the base paper to prepare a support.
Next, regarding the generation of cracks on the roll surface, the occurrence of rust on the roll surface, discoloration of the surface of the base paper, whether or not polishing is possible, Oken type smoothness, the number of small holes, electrical resistance, wear resistance, and comprehensive evaluation, Evaluation was performed in the same manner as in Example 1. The results are shown in Table 3.

＊ＷＣ溶射：タングステンカーバイト溶射
＊スピード：原紙のカレンダー処理の速度

* WC spraying: tungsten carbide spraying * Speed: speed of calendar processing of base paper

From the above result, it turned out that Examples 1-9 have the performance which was comprehensively seen compared with Comparative Examples 1-4.
In Example 2, calendering was performed at a surface temperature of 200 ° C., and the Oken smoothness was 217 sec. The number of small holes was 90 / cm ² , which was the lower limit of specification. There was no problem.
In Example 4, the roll surface layer had a thickness of 220 μm and was calendered at 350 ° C., and some peeling of the roll surface layer was confirmed after use, but there was no problem in actual use.
In Example 5, the roll surface layer had a thickness of 50 μm and was calendered at 350 ° C., and no cracks or rust occurred. When the roll surface was scratched, it could not be polished and resprayed, but there was no problem in actual use.
In Example 6, calendering was performed at a surface temperature of 370 ° C., and the Oken type smoothness was 405 sec, and the number of small holes was 6 / cm ² . There was a slight yellow stain on the surface of the base paper, which seems to have caused the internal additive chemical to discolor partially, but there was no problem in practical use.
In Example 7, since an alkyltrimethylammonium salt was used as an antistatic agent contained in the surface sizing solution, the electrical resistance increased and the antistatic property slightly decreased, but there was no problem in practical use.

On the other hand, in Comparative Example 1, since the calendar process was performed at a surface temperature of 180 ° C., the Oken type smoothness was 195 sec, the number of small holes was 105 / cm ^2, and the overall evaluation was x. did.
In Comparative Example 2, an industrial chrome plating film having a thickness of 150 μm was formed and calendered at 200 ° C., and minute cracks could be confirmed on the roll surface.
In Comparative Example 3, an industrial chrome plating film having a thickness of 150 μm was formed and calendered at 350 ° C., and a large number of cracks were confirmed on the roll surface.
Moreover, since the comparative example 4 did not provide a roll surface layer, and since many rust was confirmed on the roll surface after a calendar process, comprehensive evaluation was set to x.

(Example 10)
<Production of electrophotographic materials>
Using the image recording material support of Example 1, an electrophotographic material of Example 10 as an image recording material of the present invention was produced by the following method.

-Preparation of titanium dioxide dispersion-
40.0 g of titanium dioxide (Taipaque (registered trademark) A-220, manufactured by Ishihara Sangyo Co., Ltd.), 2.0 g of PVA102 (manufactured by Kuraray Co., Ltd.), and 58.0 g of ion-exchanged water were mixed, and NBK- manufactured by Nippon Seiki Seisakusho Co., Ltd. 2 was used to prepare a titanium dioxide dispersion (with a titanium dioxide pigment content of 40% by mass).

-Preparation of coating solution for toner image-receiving layer-
15.5 g of the titanium dioxide dispersion, 15.0 g of carnauba wax dispersion (Cerosol 524, manufactured by Chukyo Yushi Co., Ltd.), water dispersion of polyester resin (solid content 30% by mass, KZA-7049, manufactured by Unitika Co., Ltd.) 0 g, 2.0 g of thickener (Alcox E30, manufactured by Meisei Chemical Co., Ltd.), 0.5 g of anionic surfactant (AOT), and 80 ml of ion-exchanged water are mixed and stirred to obtain a toner image-receiving layer coating solution. Prepared.
The resulting toner image-receiving layer coating solution had a viscosity of 40 mPa · s and a surface tension of 34 mN / m.

-Preparation of coating solution for back layer-
The following components were mixed and stirred to prepare a back layer coating solution.
Acrylic resin water dispersion (solid content 30% by mass, Hiloss XBH-997L, manufactured by Hoshiko Chemical Co., Ltd.) 100.0 g, matting agent (Tecpomer MBX-12, manufactured by Sekisui Plastics Co., Ltd.) 5.0 g, mold release Agent (Hydrin D337, manufactured by Chukyo Yushi Co., Ltd.) 10.0 g, thickener (CMC) 2.0 g, anionic surfactant (AOT) 0.5 g, and ion-exchanged water 80 ml are mixed, stirred, and back layer A coating solution was prepared.
The viscosity of the obtained coating liquid for back layer was 35 mPa · s, and the surface tension was 33 mN / m.

-Coating of back layer and toner image-receiving layer-
The back layer coating solution was applied to the back surface of the image recording material support of Example 1 (the surface on which the toner image receiving layer was not provided) with a bar coater so that the dry mass was 9 g / m ^2. A back layer was formed. Further, the toner image-receiving layer coating solution was applied to the front surface of each image recording material support with a bar coater so that the dry mass was 12 g / m ² , thereby forming a toner image-receiving layer. The pigment content in the toner image-receiving layer was 5% by mass relative to the thermoplastic resin.

The back layer and the toner image receiving layer were coated and then dried online with hot air. In the drying, the drying air volume and temperature were adjusted so that both the back layer and the toner image-receiving layer were dried within 2 minutes after coating. The drying point was the point at which the coating surface temperature was the same as the wet bulb temperature of the drying air.
Next, after drying, a calendar process was performed. The calendering process was performed under the condition of a nip pressure of 14.7 kN / m ² using a gloss calender and keeping the metal roller at 40 ° C.
The electrophotographic material obtained as described above was cut to produce an A4 size electrophotographic material.

(Example 11)
-Production of electrophotographic materials-
In Example 10, an electrophotographic material of Example 11 was produced in the same manner as in Example 10 except that the image recording material support of Example 2 was used.

(Example 12)
-Production of electrophotographic materials-
In Example 10, the electrophotographic material of Example 12 was produced in the same manner as in Example 10 except that the image recording material support of Example 3 was used.

(Example 13)
-Production of electrophotographic materials-
In Example 10, the electrophotographic material of Example 13 was produced in the same manner as in Example 10 except that the image recording material support of Example 4 was used.

(Example 14)
-Production of electrophotographic materials-
In Example 10, the electrophotographic material of Example 14 was produced in the same manner as in Example 10 except that the image recording material support of Example 5 was used.

(Example 15)
-Production of electrophotographic materials-
In Example 10, the electrophotographic material of Example 15 was produced in the same manner as in Example 10 except that the image recording material support of Example 6 was used.

(Example 16)
-Production of electrophotographic materials-
In Example 10, the electrophotographic material of Example 16 was produced in the same manner as in Example 10 except that the image recording material support of Example 7 was used.

(Example 17)
-Production of electrophotographic materials-
In Example 10, an electrophotographic material of Example 17 was produced in the same manner as in Example 10 except that the image recording material support of Example 8 was used.

(Example 18)
-Production of electrophotographic materials-
In Example 10, the electrophotographic material of Example 18 was produced in the same manner as in Example 10 except that the image recording material support of Example 9 was used.

(Comparative Example 5)
-Production of electrophotographic materials-
In Example 10, an electrophotographic material of Comparative Example 5 was produced in the same manner as in Example 10 except that the image recording material support of Comparative Example 1 was used.

(Comparative Example 6)
-Production of electrophotographic materials-
In Example 10, an electrophotographic material of Comparative Example 6 was produced in the same manner as in Example 10 except that the image recording material support of Comparative Example 2 was used.

(Comparative Example 7)
-Production of electrophotographic materials-
In Example 10, an electrophotographic material of Comparative Example 7 was produced in the same manner as in Example 10 except that the image recording material support of Comparative Example 3 was used.

(Comparative Example 8)
-Production of electrophotographic materials-
In Example 10, the electrophotographic material of Comparative Example 8 was produced in the same manner as in Example 10 except that the image recording material support of Comparative Example 4 was used.

Next, images were printed for each of the electrophotographic materials of Examples 10 to 18 and Comparative Examples 5 to 8 using an electrophotographic printer, and each electrophotographic print was created.
As the printer used, a color laser printer (DocuColor 1250-PF) manufactured by Fuji Xerox Co., Ltd., having the fixing unit shown in FIG. 1 as the belt fixing device 1 was used. That is, in the belt fixing device 1 shown in FIG. 1, the fixing belt 2 is suspended over the heating roller 3 and the tension roller 5, and the cleaning roller 6 is interposed above the tension roller 5 via the fixing belt 2. Further, a pressure roller 4 is provided below the heating roller 3 via the fixing belt 2. The electrophotographic material having a latent toner image is inserted between the heating roller 3 and the pressure roller 4 from the right side in FIG. 1, fixed, and then moved on the fixing belt 2 in the process. Then, it is cooled by the cooling device 7 and finally cleaned by the cleaning roller 6.
In the belt fixing device 1, the conveyance speed of the fixing belt 2 is 30 mm / second, the nip pressure between the heating roller 3 and the pressure roller 4 is 0.2 MPa, and the set temperature of the heating roller 3 Is 150 ° C., which corresponds to the fixing temperature. The set temperature of the pressure roller 4 was set to 120 ° C.

  Next, the image quality and glossiness of the obtained electrophotographic prints were evaluated as follows. The results are shown in Table 4.

<Evaluation of image quality>
The image quality of each electrophotographic print was visually observed, and the best image quality was ranked as A and then evaluated as B, C, D, E based on the following criteria.
〔Evaluation criteria〕
A: Excellent (effective as a high-quality recording material)
B: Excellent (effective as a high-quality recording material)
C: Intermediate D: Inferior (not possible as a high-quality recording material)
E: Very poor (not possible as a high-quality recording material)

<Glossy>
The glossiness of each electrophotographic print was visually observed, and the best glossiness was ranked as A and then evaluated as B, C, D, E based on the following criteria.
〔Evaluation criteria〕
A: Excellent (effective as a high-quality recording material)
B: Excellent (effective as a high-quality recording material)
C: Intermediate D: Inferior (not possible as a high-quality recording material)
E: Very poor (not possible as a high-quality recording material)

表４の結果から、実施例１〜９の画像記録材料用支持体を用いた実施例１０〜１８の各電子写真材料は、比較例１〜４の画像記録材料用支持体を用いた比較例５〜８の各電子写真材料と比較して、同レベルの優れた画質を有し、更に光沢感が向上していることが認められる。

From the results of Table 4, each of the electrophotographic materials of Examples 10 to 18 using the support for image recording material of Examples 1 to 9 is a comparative example using the support for image recording material of Comparative Examples 1 to 4. Compared with each of the electrophotographic materials 5 to 8, it is recognized that the image quality is excellent at the same level and the glossiness is further improved.

  The method for producing a support for image recording and the support for image recording material of the present invention use a base paper obtained by calendering with a roll having a surface layer containing at least one selected from cermet materials. Excellent in performance and few small holes (small dents), so it is suitable for a wide range of applications such as electrophotographic materials, heat-sensitive materials, sublimation transfer materials, thermal transfer materials, thermal development materials, silver salt photographic materials, and inkjet recording materials. Used.

FIG. 1 is a schematic diagram of a belt fixing device in a printer used in the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt fixing device 2 Fixing belt 3 Heating roller 4 Pressure roller 5 Tension roller 6 Cleaning roller 7 Cooling device

Claims (16)

A support for an image recording material having a base paper and a thermoplastic resin layer on at least one surface of the base paper,
The support for an image recording material, wherein the base paper is calendered with a roll having a surface temperature of 200 ° C. or more, and the roll has a surface layer containing at least one selected from cermet materials. .   The support for an image recording material according to claim 1, wherein the roll has a surface temperature of 200 to 350 ° C.   3. The image recording material according to claim 1, wherein the surface of the base paper on which the image recording layer is provided is calendered so as to contact a roll having a surface layer containing at least one selected from cermet materials. Support.   The support for an image recording material according to any one of claims 1 to 3, wherein the surface of the base paper opposite to the surface on which the image recording layer is provided is calendered so as to contact a roll having a Shore D hardness of 60 to 95 °. .   The support for an image recording material according to any one of claims 1 to 4, wherein the cermet material is a tungsten carbide cermet.   6. The support for an image recording material according to claim 5, wherein the tungsten carbide cermet is any one of tungsten carbide-cobalt, tungsten carbide-cobalt chromium, and tungsten carbide-nickel chromium.   The support for an image recording material according to any one of claims 1 to 6, wherein the surface layer has a thickness of 60 to 220 µm.   The support for an image recording material according to any one of claims 1 to 7, wherein the roll has a surface roughness of 0.5S or less.   The support for an image recording material according to any one of claims 1 to 8, wherein the base paper before the calendar treatment contains an antistatic agent.   The support for an image recording material according to claim 9, wherein the antistatic agent is a water-soluble metal salt, and the water-soluble metal salt is any one of calcium chloride, sodium chloride, and magnesium chloride.   The support for an image recording material according to any one of claims 1 to 10, wherein the thermoplastic resin layer contains a polyolefin resin.   A roll having a surface layer containing at least one material selected from tungsten carbide-based cermet materials is in contact with the surface of the base paper on which the image recording layer is provided, and the surface temperature of the roll is 200 ° C. or higher. The manufacturing method of the support body for image recording materials characterized by including the process to process.   The manufacturing method of the support body for image recording materials of Claim 12 including the surface size processing process of apply | coating the liquid containing a water-soluble metal salt to a base paper surface before a calendar process.   The method for producing a support for an image recording material according to any one of claims 12 to 13, comprising a step of forming a thermoplastic resin layer on at least one surface of the base paper after the calendar treatment.   12. An image recording material comprising the support for image recording material according to claim 1 and an image recording layer on which at least an image is recorded. The image recording material according to claim 15, which is any one selected from electrophotographic materials, heat-sensitive materials, sublimation transfer materials, thermal transfer materials, silver salt photographic materials, and ink jet recording materials.

Images