JPH08194326A - Electrophotographic image receiving medium - Google Patents

Abstract

PURPOSE: To provide an image receiving medium less liable to a variation in performance due to environmental conditions such as temp. and humidity, excellent in transferring property, not causing the scattering of a toner, ensuring improved transferability and fixability of the toner and excellent also in the adhesion of an antistatic agent to the substrate. CONSTITUTION: This image receiving medium contains an antistatic agent utilizing siloxane bonds in the surface and/or interior of the substrate or has a layer of a film forming resin and a layer of the antistatic agent successively laminated on the substrate. The antistatic agent may be a chemical combination of a silyl group-contg. vinyl polymer with polysiloxane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image receiving medium used for dry electrophotographic recording, and more particularly to an electrophotographic image receiving medium having improved toner transferability.

[0002]

2. Description of the Related Art Generally, as an electrophotographic image receiving medium, a substrate such as paper or plastic film coated with an inorganic salt such as sodium chloride or an antistatic agent such as quaternary ammonium salt is used.

[0003]

In the electrophotographic recording method, a photoconductor consisting of a conductive substrate and a photoconductive material layer is charged by irradiation of corona discharge ions, and an image pattern is irradiated onto the photoconductor as a light image. Then, a toner is attached to the surface charge image formed on the photoconductor to develop the image, and the image is transferred to an image receiving medium and fixed by heat or pressure to obtain a recorded image. In electrophotography,
The surface resistivity of the image receiving medium is a characteristic that affects the running property, the transfer property, and the image quality. In particular, in terms of transferability, the transfer rate of toner largely changes depending on the surface resistivity of the image receiving medium. When the surface resistivity is high, the transfer rate is high, and when the surface resistivity is low, the transfer rate is low. The surface resistance value of the image receiving medium can be controlled by the type and amount of the conductive agent used. The surface resistivity of the image receiving medium is greatly affected by environmental conditions due to temperature and humidity. 30 ° C
Under high temperature and high humidity conditions of 80% RH or more, the surface specific resistance value of the electrophotographic image receiving medium tends to be low, and in this case, the electric charge necessary for transferring the toner cannot be retained, It may cause transfer failure. On the other hand, 1
Under low temperature and low humidity conditions of 0 ° C ・ 20% RH or less,
The surface specific resistance value of the image receiving medium is likely to be high, and the electric charges accumulated in the photoconductor due to corona discharge are likely to be charged on the electrophotographic image receiving medium itself, so that the charge amount is increased. The charges charged during the transfer and fixing steps flow into the inside of the device via the toner and cause toner scattering, or cause electrostatic offset of the toner in the fixing unit. An example of controlling the surface specific resistance value of the electrophotographic image receiving medium within a certain range under low or high humidity is disclosed in, for example, Japanese Patent Publication No. 2-5046.
There is a technique described in Japanese Patent No. Here, high-quality paper is made to contain inorganic salts such as sodium chloride and potassium chloride to reduce the surface specific resistance value. However, under low humidity conditions, the surface resistivity is too high to solve the problem of toner scattering.

An image receiving medium using an inorganic conductive agent or an antistatic agent is generally too sensitive to humidity change and / or temperature change, and conventional ionic organic conductive agents or antistatic agents are, for example, Polyamide / epiclohydrin added to increase the impregnation rate to the pulp of anionic emulsions that have been used as a sizing agent for pulp in pulp slurries that are generally used in the range of 1 to 10% in papermaking. System, modified polyacrylamide system,
Although it has been used in the papermaking process for a while like cationic water-soluble resins such as polyethyleneimine, it is clear that the resulting ordinary high-quality paper is not necessarily a satisfactory electrophotographic image receiving medium. As described above, it is difficult to always provide an electrophotographic image receiving medium free of toner scattering. Furthermore, when a commercially available emulsion-type polymer material is used as it is, an ionic (non-radical type) emulsion polymerization initiator is used, and as a result, the decomposition product of the strongly negatively charged initiator is used as a medium. There is a risk that it will already be included at the beginning of processing. On the other hand, many of the polymeric materials used in the form of a coating liquid or the like for the reprocessing of the paper after papermaking are those in which water is the medium, and these are divided into latex type and aqueous type. The former is a vinyl acetate emulsion polymer, a styrene-butadiene latex, and an acrylic emulsion polymer, and the latter is a natural polymer, a polyvinyl alcohol, an acrylic or a polyvinylpyrrolidone polymer resin, an alkyd resin. Alkyd resin-based condensation resins such as amino alkyd resins and phenol alkyds have been mainly used for a long time.

On the other hand, a silicone resin is often used in the field of toner image transfer technology, but in most cases, a resin intended to be “peeled” or its water-repellent property or oil-repellent property is intended. "High insulation" or its "heat resistance"
As far as the inventor of the present invention knows, there are not so many techniques for applying the present invention to an ordinary toner-transferred sheet for the purpose of imparting "conductivity". Polyorganosiloxanes, especially straight silicone varnishes, have been in great demand for conventional mica bonding, adhesives for electronic components such as resistors and coil impregnation for electronic parts, impregnating agents and / or paints, moisture-proof surface treatment, glass cloth lamination It is the result of being mainly manufactured and consumed in a large amount as an intermediate, etc. for use as a coating material, coating material for cloth pipe treatment, for heat resistance and weather resistance, for mold release, or for these. For example, in JP-A-1-267658, in order to improve the cleaning performance after toner image transfer, the transfer layer of the intermediate transfer member is made of porous polytetrafluoroethylene.
JP-A-2-14099 discloses a pressure-sensitive adhesive paper comprising an upper paper, a pressure-sensitive adhesive layer, and a release paper, and a lubricant layer on the end surface of the pressure-sensitive adhesive layer. It is described that the adhesive is not brought into contact with the photoconductor so that the copy stain is eliminated. JP-A-2-37362 discloses a spherical silicon on the surface and inside of the transfer paper. It is described that the presence of coated particles improves transferability, environment resistance and transportability, and JP-A-2-134662 discloses a substance that is secondarily adhered by heat and pressure. It has been shown that by using silicon when it is fused on an article such as cloth or paper, the toner transferred and printed on the article is firmly adhered to prevent peeling.
Japanese Patent Laid-Open No. 40889/1989 describes using silicon and a fluororesin together with a particulate material to obtain a label laminate excellent in toner fixing property, water resistance and running stability. No. 6121 discloses that when a toner is printed on a recording sheet by an electrostatic transfer method to obtain a recording for OHP, and the recording sheet has an alumina hydrate,
It is described that a suitable recorded material is obtained by appropriately supplying a silicone oil lubricant to the lubricant supply roll.
In Japanese Patent Laid-Open No. 5-46035, when the toner image is transferred to the intermediate transfer medium and then transferred to the final transfer target, deterioration of the intermediate transfer medium is prevented, the life of the intermediate transfer medium is extended, and fluctuations in image quality are suppressed. It is described that the intermediate transfer medium is coated with a specific silicon compound, and it is described in JP-A-5-12754.
Japanese Patent Laid-Open No. 7-76 describes that a certain kind of spherical particle is used in order to prevent transfer of silicone oil to the photosensitive drum via a transfer sheet and to prevent image stain fogging due to adhesion of silicone oil. Japanese Patent Laid-Open No. 5-2211
In JP-A-49-49, in a recording sheet by a thermal transfer system, an ink non-fixing transfer layer made of a silicon-modified alkyd resin is provided on the sheet to make a printed image clear and peel off the adhesive sheet without any trouble. It is described that, while improving the appearance when the object is attached, it is disclosed in JP-A-5-3302.
In Japanese Patent Laid-Open No. 63-63, in order to prevent the double feeding of the transparent image receiving sheet during recording, organic resin fine particles such as polysiloxane are contained in the transparent image receiving layer so that a part thereof protrudes from the transparent image receiving layer. Are described in JP-A-60-254147.
Japanese Patent Laid-Open Publication No. 2003-242242 discloses a cleaning device in which a dielectric layer containing a polysiloxane polymer is formed on the surface of a conductive substrate having a high strength to withstand a long time pressure and improve the releasability. Japanese Patent Application Laid-Open No. 62-924332 discloses that a quaternary ammonium compound is applied to both front and back surfaces of a base film containing a polyacrylate resin as a main component, and a quaternary ammonium salt and silano. -Coating OH with good image quality by applying an antistatic layer of siloxane that has a specific surface resistance value.
It is described that a film for P is obtained.
Japanese Patent No. 289390 describes that an OHP film having excellent transportability and excellent blocking resistance even when stored for a long period of time is obtained by treating an OHP film substrate with a coating solution containing a siloxane polymer. There is. Thus, the silicone resin in the prior art is almost always
Is its water / oil repellency paid attention to, and is it used for "peeling" or its "high insulation" or its "heat resistance"?
Alternatively, it is applied to an image forming apparatus, for example, an intermediate transfer cylinder in the apparatus, for forming an image for a specific purpose such as an emblem, a patch or a label, or for a special substrate such as a color OHP film, Surprisingly, there are not many examples used for office image receiving layers.

Japanese Unexamined Patent Publication Nos. 5-173351 and 5
No. 229084 and Japanese Patent Application Laid-Open No. 5-230245, when fixing with a heat roller after color toner transfer,
Various polysiloxanes and / or various polysiloxanes are used in order to improve the absorbability, runnability and print quality of the silicone oil used for preventing the transfer of toner to the heat roller, the so-called toner offset phenomenon.
Alternatively, the use of a combination of polysiloxane and another polymer compound, for example, a quaternary ammonium polymer compound for controlling the surface resistance value makes it possible to form a polyethylene or polyethylene terephthalate film which is less likely to cause toner offset. It is described together with the use, for example, Japanese Patent Laid-Open No.
JP-A-229084 discloses the use of a reaction product of an organopolysiloxane polyol having two or more hydroxyl groups and another polymer polyol and an isocyanate. Is an example in which a layer of a material having substantially the same quality as silicon oil and easy to adapt is provided in order to facilitate the absorption of silicon oil in a special substrate. Japanese Patent Laid-Open No. 4-
JP-A-303847 discloses a silicone oil / silicone emulsion having a reactive substituent and an adhesive for improving electrophotographic transfer image-receiving paper in running property at the time of transfer and improving suitability for office paper such as writing property and imprinting property. It has been shown to apply an aqueous coating solution containing as a main component to a base paper, but here, as an example of a silicone oil having a reactive substituent, an epoxy polyester made by Toray Silicone Co., Ltd. is used. Modified silicone oil (trade name: “SF-8421]), alcohol manufactured by Toray Silicone Co., Ltd. (trade name:“ SF-8427]), an example of the silicone emulsion is Toray Silicone Co., Ltd. Amino-modified silicone emulsion (trade name: "SM-8702", "SM-8"
709], "BY22-812", "BY22-81".
6], "BY22-819]," BY22-82.
3]), carboxy-modified silicone emulsion (trade name: “BY22-820]), and epoxy-modified silicone emulsion manufactured by Shin-Etsu Chemical Co., Ltd. (trade name:“ Pol ”).
on MF-11B], “Polon MF-18B]
Etc., which are commercially available and therefore of a given nature and finite.

The present invention has been made to solve the above problems, and an object thereof is to provide an electrophotographic image receiving medium which is excellent in transferability under environmental conditions of high temperature and high humidity or low temperature and low humidity and is free from toner scattering. To do.

[0008]

According to the present invention, there is provided an "electrophotographic image-receiving medium characterized by containing an antistatic agent utilizing a siloxane bond on the surface and / or inside of a substrate". "An electrophotographic image receiving medium characterized in that a film-forming resin layer and a layer formed of an antistatic agent utilizing a siloxane bond are sequentially laminated on a substrate"
"On the surface and / or inside of the substrate, silicon tetrachloride, a monovalent alcohol selected from the group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol and butyl alcohol, acetic acid. On a substrate and / or containing an antistatic agent of a partial hydrolysis product formed by reacting with water in a predetermined amount of an ester selected from the group consisting of methyl, ethyl acetate, propyl acetate, butyl acetate. Is provided with a film-forming resin layer and a layer formed of an antistatic agent using a siloxane bond in order, and an "electrophotographic image-receiving medium" is provided, wherein "the surface and / or the inside of the substrate is provided". A synthetic resin, such as an epoxy resin or a phenol, which reacts a siloxane having an oligomerized reactive group with a reactive group of the polysiloxane to form a complex having antistatic ability. Butter, acrylic resin, methacrylic resin, polyester resin, blended with an alkyd resin or the like,
It is characterized in that it comprises an antistatic agent obtained by cooking and modification and / or is formed by sequentially laminating a film-forming resin layer and a layer formed of an antistatic agent utilizing a siloxane bond on a substrate. And an "electrophotographic image-receiving medium", which forms a complex having antistatic properties with "polysiloxane on the surface and / or inside of a substrate and containing a silyl group and polycondensation after polycondensation". Containing an antistatic agent produced by condensation reaction with a vinyl polymer in an inert solvent medium and / or formed from a film forming resin layer and an antistatic agent utilizing a siloxane bond on a substrate An image receiving medium for electrophotography, wherein the polysiloxane comprises:

[General formula 1] (In the formula, X is selected from a halogen atom, an alkoxy group, an alkoxyalkoxy group, an acyloxy group, an amino group, an aminoxy group, and one or more kinds of hydrolyzable groups and a hydroxyl group. It represents a group in which at least one hydrolyzable group and a hydroxyl group are present, and R represents an organic group which may be the same or different.
Also, a is 0, 1 or 2, and n is an integer.)
Is a polysiloxane represented by the above, and the silyl group-containing vinyl polymer is

[General formula 2] (Wherein R ₁ represents hydrogen or an alkyl group having 1 to 8 carbon atoms) and / or

[General formula 3] (Wherein R ₂ represents hydrogen or an alkyl group having 1 to 8 carbon atoms) and / or
Other vinyl monomers copolymerizable with these, a polymer or copolymer of

[General formula 4] (In the formula, R ₃ is a monovalent hydrocarbon group selected from an alkyl group having 1 to 10 carbon atoms, an aralkyl group and an aryl group, and X ′.
Represents a hydrolyzable group selected from a halogen atom, an alkoxy group, an alkoxyalkoxy group, an acyloxy group, an amino group and an aminoxy group, and b is 0, 1 or 2.
Hydrosilylated with a hydrosilane having at least one hydrolyzable group on a silicon compound represented by
And / or with the polymerizable vinyl-based monomer

[General formula 5] (In the formula, R ₄ is a monovalent hydrocarbon group selected from an alkyl group having 1 to 10 carbon atoms, an aralkyl group and an aryl group, and R ₅ is a polymerizable double bond bonded to silicon by a carbon-silicon bond. An organic residue having a bond, X ″ represents a hydrolyzable group selected from a halogen atom, an alkoxy group, a lucoxyalkoxy group, an acyloxy group, an amino group and an aminoaxy group, and c is 0, 1 or 2. Represented by a copolymerizable silicon compound having at least one hydrolyzable group on silicon, and having at least one silyl group bonded to the terminal or side chain with the hydrolyzable group in one molecule. An image receiving medium for electrophotography, which is a vinyl polymer containing a silyl group, is provided.

In the image receiving medium of the present invention, an antistatic agent utilizing the antistatic ability of the siloxane bond, which has a small fluctuation in the surface specific resistance value due to environmental conditions, is used in order to adjust the surface specific resistance value of the image receiving medium. In addition, the transferability is excellent, and toner scattering hardly occurs. 1 and 2 show the basic structure of an electrophotographic image receiving medium of the present invention. In FIG.
The antistatic agent using the siloxane bond is the antistatic agent layer 2
As the above, it is not necessary to form a definite layer, and the layer may exist inside the substrate 1. As the substrate 1, a sheet-shaped substrate used for a conventional image receiving medium can be used as it is, and there is no particular limitation. For example, polyolefin-based, polystyrene-based synthetic paper, fine paper, art paper, coated paper, cast coated paper, wallpaper, backing paper,
Synthetic resin impregnated paper, emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin internal paper, paperboard, etc., various transparent plastic films such as cellulose fiber paper, polyolefin, polyvinyl chloride, polyethylene terephthalate, polystyrene, polymethacrylate, polycarbonate, etc. Or a sheet etc. can be mentioned. Further, a white opaque film formed by adding a white pigment or a filler to these synthetic resins, a foamed foamed sheet, or the like can also be used. Further, a laminate made of any combination of the above base films, for example, a laminate of cellulose fiber paper and synthetic paper, a laminate of cellulose fiber paper and plastic film, and the like can be used. The thickness of such a substrate 1 can be arbitrarily set according to the purpose of use and the like, and is preferably about 15 to 200 μm, for example. further,
The substrate 1 is preferably subjected to a primer treatment or a corona discharge treatment on the surface when the adhesion to the antistatic agent layer 2 or the film-forming resin layer 3 described later formed on the surface is poor. As the antistatic agent utilizing the polysiloxane bond used in the antistatic agent layer 2, as described above, a straight silicone antistatic agent, and
More preferably, a modified silicone (silicone-modified resin) -based material can be used, which is a binder for papermaking.
It can be used as a sizing agent, as an antistatic agent coating solution, as an impregnating solution, or by sequentially laminating a film-forming resin layer and a layer formed of an antistatic agent on a substrate. In the practice of the present invention, when the coating solution or impregnating solution of the antistatic agent utilizing a siloxane bond is a straight silicone type, a silano-containing highly reactive compound is used.
Rather than first coating or impregnating commercially available straight silicon which is dissolved in an organic solvent and contains a large amount of a group (≡Si-OH group) and is used as a silicon varnish, and then heat curing it, first, for the purpose of the present invention, An antistatic agent is freshly prepared to suit it and then used for substrate treatment. Commercially available straight silicones are obtained by dissolving the corresponding organochlorosilane in an organic solvent, adding it to water, and hydrolyzing it. In this case, the main components are methyltrichlorosilane (T unit) and dimethyl. It is a mixture of organochlorosilanes such as dichlorosilane (D unit), phenyltrichlorosilane (T unit), diphenyldichlorosilane (D unit), and methylphenyldichlorosilane (D unit), which have different hydrolysis rates.
The unstable oligomeric intermediate obtained by hydrolysis is polycondensed to have a high molecular weight, and the obtained resin is dissolved in an organic solvent,
Use silicone varnish. Various types of straight silicone varnish are commercially available, and the properties of the cured film of these commercially available straight silicone varnishes, and thus their uses, are largely determined by the combination of silanes used. For example, a silicone resin consisting only of methyl groups has a large amount of SiO ₂ and forms a film having a high flame retardancy. It also has excellent water repellency, but lacks flexibility and gloss. When the number of phenyl groups increases, the flexibility and gloss of the film increase, but softening during heating becomes remarkable. Also, the more D units there are, the greater the flexibility, but this is because D units are less likely to be linked in a chain,
Due to its tendency to cyclize, it exhibits a role as a plasticizer.

On the other hand, in the present invention, when a straight silicone type is newly prepared and used as an antistatic agent, various raw materials preset so as to achieve the purpose of the present invention are used. That is, a polyfunctional silicon compound such as silicon tetrachloride is reacted with water in a predetermined amount of monovalent alcohols or esters to form a partial hydrolysis product, which is used. As the monovalent alcohol, methyl alcohol, ethyl alcohol, isopropyl alcohol and butyl alcohol can be preferably used, and as the ester, methyl acetate, ethyl acetate, propyl acetate and butyl acetate can be used. It can be used preferably. Silicone varnish is cured by heat, but especially in the case of straight silicone varnish, it remains at high temperature as it is.
Since it takes a long time, organic carboxylic acid metal salts (Pb, Fe, Zn, etc.), amines, amine-acid adducts, and the like can be used as catalysts in a range that does not cause changes in antistatic ability due to changes in temperature and humidity. it can. In the present invention, more preferably, a modified silicone resin (silicone modified resin) -based antistatic agent can be used. As is well known, the range of the modified silicone resin (silicone modified resin) is wider than that of the straight silicone type. Therefore, in the present invention, rather than using a commercially available product, the raw materials are carefully designed and prepared in advance so that the purpose of the present invention can be achieved. That is, a siloxane having an oligomerized reactive group is blended and cooked with a synthetic resin that reacts with the reactive group of the polysiloxane, for example, an epoxy resin, a phenol resin, an acrylic resin, a methacrylic resin, a polyester resin, an alkyd resin, or the like. Or a chemical complex formed by subjecting a silyl group-containing vinyl polymer and a polysiloxane to a condensation reaction in an inert solvent medium is newly prepared and used. The latter freshly prepared chemical complex is more preferred. In this latter case, the polysiloxane is

[General formula 1] (In the formula, X is selected from a halogen atom, an alkoxy group, an alkoxyalkoxy group, an acyloxy group, an amino group, an aminoxy group, and one or more kinds of hydrolyzable groups and a hydroxyl group. Represents a group in which at least one hydrolyzable group and a hydroxyl group are present, R represents an organic group which may be the same or different, and a represents 0, 1 or 2, and n represents an integer) The represented polysiloxanes can be used.

On the other hand, as the silyl group-containing vinyl polymer to be condensed with the silyl group-containing vinyl polymer, a silyl group-containing vinyl polymer having at least one silyl group having a hydrolyzable group bonded to the terminal or side chain in one molecule is used. This is adjusted, for example, as follows.

[General formula 2] (Wherein R ₁ represents hydrogen or an alkyl group having 1 to 8 carbon atoms), and / or

[General formula 3] (Wherein R ₂ represents hydrogen or an alkyl group having 1 to 8 carbon atoms) and / or
Other vinyl monomers copolymerizable with these, a polymer or copolymer of

[General formula 4] (In the formula, R ₃ is a monovalent hydrocarbon group selected from an alkyl group having 1 to 10 carbon atoms, an aralkyl group and an aryl group, and X ′.
Represents a hydrolyzable group selected from a halogen atom, an alkoxy group, an alkoxyalkoxy group, an acyloxy group, an amino group and an aminoxy group, and b is 0, 1 or 2.
At least one hydrolyzable group on silicon represented by
May be hydrosilylated with an individual hydrosilane,
Also, with the polymerizable vinyl-based monomer,

[General formula 5] (In the formula, R ₄ is a monovalent hydrocarbon group selected from an alkyl group having 1 to 10 carbon atoms, an aralkyl group, and an aryl group; R ₅ is a polymerizable group having a carbon-silicon bond to silicon; An organic residue having a heavy bond, X ″ represents a hydrolyzable group selected from a halogen atom, an alkoxy group, a lucoxyalkoxy group, an acyloxy group, an amino group and an aminoaxy group, and c is 0, 1 or 2. By copolymerizing with a polymerizable silicon compound having at least one hydrolyzable group on silicon, at least one silyl group bonded to the hydrolyzable group at the terminal or side chain is present in one molecule. The silyl group-containing vinyl polymer can be prepared by mixing the silyl group-containing vinyl polymer thus prepared with the polysiloxane solution. The polysiloxane and vinyl polymer were chemically combined by a strong siloxane bond by condensation reaction between the hydroxyl group of OH and the hydrolyzable group bonded to the silyl group of the vinyl polymer. An antistatic agent can be obtained, and among these, the newly prepared chemical composite is more preferable because it has excellent adhesion to the plastic film.

The antistatic agent layer is formed by coating and drying the colloidal dispersion liquid of the antistatic agent utilizing the siloxane bond on the substrate 1 or the film forming resin layer 3 by a known means. The thickness of the antistatic agent layer 2 is preferably about 0.1 to 5 μm, more preferably 0.2 to 3 μm. Figure 2
In, the film-forming resin layer 3 formed on the substrate 1 is a layer containing a film-forming resin as a main component. By providing this layer, the transferability and fixing property of the toner are improved. Examples of the film-forming resin include polyolefin resins such as polypropylene, halogenated polymers such as polyvinyl chloride and polyvinylidene chloride, vinyl polymers such as polyvinyl acetate and polyacrylic ester, and polyester resins such as polyethylene terephthalate and polybutylene terephthalate. Resins, polystyrene resins, polyamide resins, copolymer resins of olefins such as ethylene and propylene with other vinyl monomers, ionomers, cellulose resins such as cellulose diacetate, polycarbonates, etc. Vinyl-based resins and polyester-based resins. The film forming resin layer 3 is formed by coating and drying a coating liquid prepared by dissolving or dispersing the above resin in a suitable solvent on the substrate 1 by a known means.
The thickness of the film-forming resin layer 3 is preferably about 0.1 to 20 μm, more preferably 2 to 9 μm. In the image receiving medium of the present invention, a back layer may be provided on the surface of the substrate 1 opposite to the side on which the antistatic agent layer 2 is provided. (The back layer is for preventing the multi-feeding of the image receiving mediums during the transportation of the image receiving medium and for improving the transferability of the toner.) The back layer may be a known antistatic agent, if necessary.
Inorganic or organic fine particles and resin may be contained. Examples of the resin include the above film-forming resin and cationic acrylic resin. The thickness of the back layer is 0.1-5 μm
The degree is preferably, and more preferably 0.5 to 3 μm.

[0013]

EXAMPLES In the text, parts and% are based on weight unless otherwise specified. [Production of antistatic agent using siloxane bond]

Antistatic agent of the type of Reference Example 1 To 500 parts of ethyl acetate was added 550 parts of ethyl alcohol, and 40 parts of silicon tetrachloride was gradually added with stirring.
After the addition was completed, the mixture was allowed to stand for 4 days to obtain a dispersion liquid of the antistatic agent.

Antistatic agent of the type of Reference Example 2 100 parts of butyl methacrylate (hereinafter BMA), 3 parts of azobisisobutyronitrile (AIBN) and 90 parts of n-dodecyl mercaptan in 90 parts of toluene heated to 100 ° C.
A solution in which parts were dissolved was added dropwise over 6 hours, and then the reaction was continued for 2 hours to obtain a BMA polymer having a molecular weight of 5.000. Next, 2.5 parts of methyldimethoxysilane and 0.0005 part of chloroplatinic acid were added to 30 parts of the obtained BMA polymer in isopropanol.
The solution dissolved in the solvent was added, and the mixture was sealed at a temperature of 90 ° C. and reacted for 8 hours to obtain a silyl group-containing BMA polymer. Further, 25 parts of water, 35 parts of orthoethyl silicate and 0.5 part of concentrated hydrochloric acid were mixed with 100 parts of isopropanol and reacted at a temperature of 60 ° C. for 5 hours to obtain a polysiloxane solution. To 20 parts of the obtained silyl group-containing BMA polymer, 100 parts of a polysiloxane solution was added and reacted at room temperature for 30 minutes with stirring. 40 parts of ethyl acetate, 20 parts of n-butanol,
After adding 20 parts of cyclohexanone, the mixture was allowed to stand for 24 hours to obtain an antistatic agent.

Example 1 Freeness of 380 ml with a refiner c. s. LBKP beaten to f and 440 ml c. s. N beat up to f
5 parts of light calcium carbonate (trade name TP121; manufactured by Okutama Kogyo Co., Ltd.), 2 parts of talc, alkyl ketene dimer type sizing agent (trade name Hacon W; 0.1 part of Dick Hercules), 0.6 part of cationic starch, 0.6 part of sulfuric acid band, and 0.02 part of cationic acrylic amide (trade name Hiholder 301; manufactured by Kurita Water Industries Ltd.) Then, the stock is adjusted, the paper is applied to a Fourdrinier paper machine, the paper is made at a paper making speed of 400 m / min, and the antistatic agent of Reference Example 1 is dried to a coating amount of 0.5 g / m ² by a size press. Apply it
An image receiving medium for electrophotography having a basis weight of 64 g / m ² was obtained.

Example 2 An image receiving medium for electrophotography was obtained in the same manner as in Example 1 except that the antistatic agent of Reference Example 2 was used in place of the antistatic agent of Reference Example 1 used in Example 1.

[0018] Comparative Example In one embodiment 1, dry coating weight of oxidized starch 0.9 g / m ² in size press, sodium chloride 0.1 g / m ²
An image receiving medium for electrophotography was obtained in the same manner as in Example 1 except that coating was performed so that

The electrophotographic image-receiving media prepared in Examples 1 and 2 and Comparative Example 1 were conditioned under the environmental conditions of 10 ° C. and 20% RH and 30 ° C. and 80% RH for 6 hours.
The surface resistivity of the electrophotographic image receiving medium was measured using a high resistance meter (4329A; manufactured by YHP). In addition, the transferability of toner and the state of toner scattering are
Similarly, using a humidity-controlled image receiving medium, and using a PPC copying machine (Recopy FT6960L; manufactured by Ricoh), 1000
It was evaluated after copying one sheet. Toner fixability was evaluated using a drawing tester (AD-2110; manufactured by Ueshima Seisakusho). The results are shown in Table 1. Regarding the transferability, scattering property, and fixing property of the toner, 4 is particularly good, 3 is good, 2 is good, and 1 is bad.

Table 1

Example 3 White polyethylene terephthalate (PET) as a substrate
A film (E20, thickness 100 μm; manufactured by Toray Industries, Inc.) was used, and the antistatic agent of Reference Example 1 was applied to one surface of this film with a bar coater and dried to form an antistatic agent layer of 0.5 μm when dried. Then, the image receiving medium of the present invention was obtained.

Example 4 An image receiving medium was obtained in the same manner as in Example 3 except that the antistatic agent of Reference Example 2 was used and an antistatic layer having a thickness after drying of 1 μm was formed. .

Comparative Example 2 A white polyethylene terephthalate film (E20, thickness 100 μm; manufactured by Toray Industries, Inc.) was used as a substrate, and a cationic antistatic agent (trade name Saftomer ST-2100; Mitsubishi Yuka Co., Ltd.) was used on one surface of this film. )) Was diluted with toluene and the solution was applied and dried with a bar coder to give a thickness of 1 μm.
An antistatic agent layer of m was formed to obtain an image receiving medium of Comparative Example 2.

Example 5 A saturated polyester resin (trade name: Byron 600; manufactured by Toyobo Co., Ltd.) on one surface of a white polyethylene terephthalate film (E20, thickness 100 μm, manufactured by Toray Co., Ltd.)
Toluene / methyl ethyl ketone (1: 1) solution was applied with a bar coater and dried to form a film-forming resin layer with a thickness of 3 μm, and the antistatic agent of Reference Example 2 was applied onto it.
After drying, an antistatic agent layer having a thickness of 1 μm was formed to obtain an image receiving medium of the present invention.

The image receiving media of Examples 3 to 5 and Comparative Example 2 were conditioned for 6 hours under the environmental conditions of 10 ° C., 20% RH and 30 ° C., 80% RH. Image recording was performed using a digital full-color copying machine (Pretail 750; manufactured by Ricoh), and the toner transferability and the toner fixability were evaluated. Further, the adhesion of the antistatic agent layer to the substrate was evaluated by a tape peeling method (using cellophane tape (manufactured by Nichiban Co., Ltd.)). 4 Particularly good 3 Good 2 Somewhat good 1 Poor results are shown in Table 2.

Table 2 In the image receiving medium of Example 5, pixels (dots) after fixing
An image was formed with no irregularity in the shape and a less rough feeling.

[0027]

As described above, according to the present invention, since the image receiving medium in the electrophotographic system has a small change due to environmental conditions, the transferability is excellent and the toner is not scattered. That is, by improving the drawback that the "surface specific resistance value of the image receiving medium", which greatly affects the running property, transfer property, image quality, especially toner transfer property, is influenced by environmental conditions due to temperature and humidity, The toner can be sufficiently transferred to the image receiving medium even under the conditions, and the toner scattering into the device and the electrostatic offset of the toner can be reduced even under the low temperature and low humidity condition. Further, when sequentially laminated with a film-forming resin layer, an image receiving medium having improved toner transferability and fixability is obtained, and further, an antistatic agent is added.
Since it is a specific chemical composite of a silyl group-containing vinyl polymer and polysiloxane, it is possible to obtain a polymer that exhibits an excellent effect in terms of adhesion of the antistatic agent to the substrate.

[Brief description of drawings]

FIG. 1 shows one basic constitution of an image receiving medium for electrophotography according to the present invention. Here, 1 represents a substrate and 2 represents an antistatic layer.

FIG. 2 shows another basic configuration of the electrophotographic image receiving medium. Here, 1 is a substrate, 2 is an antistatic layer, 3
Represents a film forming resin layer.

Claims (3)

[Claims] 1. An image receiving medium for electrophotography, comprising an antistatic agent utilizing a siloxane bond on the surface and / or inside of a substrate. 2. An image-receiving medium for electrophotography, comprising a film-forming resin layer and a layer formed of an antistatic agent utilizing a siloxane bond, which are sequentially laminated on a substrate. 3. The electrophotographic image receiving medium according to claim 1, wherein the antistatic agent is a chemical composite of a silyl group-containing vinyl polymer and polysiloxane.