KR100667795B1 - Toner for electrophotographic imaging apparatus and electrophotographic imaging apparatus employing the toner - Google Patents

Abstract

The present invention relates to a toner for an electrophotographic image forming apparatus and an electrophotographic image forming apparatus employing the same. Specifically, the present invention relates to a toner for an electrophotographic image forming apparatus including a binder resin, a colorant, a mold release agent, and a charge control agent. Resin is a polyester resin produced by the polycondensation reaction of an alcohol monomer and a carboxylic acid monomer, an electrophotographic, characterized in that the alcohol monomer contains bisphenol A or a derivative component thereof in an amount of 0.7 mol% or less. A toner for an image forming apparatus and an electrophotographic image forming apparatus employing the same.

According to the present invention, there is provided a toner for an electrophotographic image forming apparatus which is excellent in physical properties such as durability, fixability, dispersibility, and the like, which is less concerned about environmental pollution and harmless to the human body, and an electrophotographic image forming apparatus employing the same.

Toner for Electrophotographic Image Forming Apparatus, Electrophotographic Image Forming Apparatus

Description

Toner for electrophotographic imaging apparatus and electrophotographic imaging apparatus employing the same {Toner for electrophotographic imaging apparatus and electrophotographic imaging apparatus employing the toner}

1 illustrates an example of a conventional non-contact developing electrophotographic image forming apparatus.

2 is a cross-sectional view schematically showing the toner contact member and the opposing member of the electrophotographic image forming apparatus according to the present invention.

<Description of Drawing>

1: photosensitive member 2: developing roller

3: toner feed roller 4: toner

5: toner layer regulating device 6: charging device

7: cleaning blade 8: residual toner

9: Laser Scanning Unit (LSU)

21: toner contact member 22: opposing member

23: heating means

The present invention relates to a toner for an electrophotographic image forming apparatus and an electrophotographic image forming apparatus employing the same. More specifically, the present invention is excellent in physical properties such as durability, fixability, and dispersibility, and is less concerned about environmental pollution. A toner for a harmless electrophotographic image forming apparatus and an electrophotographic image forming apparatus employing the same.

Fig. 1 schematically shows an example of a conventional non-contact developing electrophotographic image forming apparatus, and the operation thereof is as described below. That is, after the photosensitive member 1 is charged by the charging device 6, an electrostatic latent image is formed on the photosensitive member by image exposure through a laser scanning unit (LSU) 9. The toner 4 is supplied to the developing roller 2 by the toner supply roller 3. The toner supplied to the developing roller 2 is thinned to a uniform thickness by the toner layer regulating device 5, and charged with high friction. The toner that has passed through the toner layer restricting device 5 is developed by electrostatic force on the electrostatic latent image formed on the photoconductor 1, and the developed toner is transferred to the paper by a transfer roller (not shown), and then fixed by a fuser (not shown). Settles down. The residual toner 8 after transfer on the photoconductor is also cleaned by the cleaning blade 7.

In the image forming method in which charging → exposure → development → transfer → cleaning → charging (repeating afterward) as described above, the image formation is performed using the toner layer regulating device (M / A) of the toner conveyed to the developing area (mg / cm). ² : Toner charging per unit weight measured on the developing roller after passing through the toner layer regulating device, and Q / M (μC / g: μC / g: passing through the toner layer regulating device). Amount), and is made by an electric field acting between the developing roller and the photosensitive member. The developing process of the process is divided into a contact type and a non-contact type, wherein the contact type refers to a method in which the developer is transferred to the latent image by contacting the surface of the developing roller and the photoconductor. The developer refers to a method in which the latent image is transferred and developed by an electric force generated according to a potential difference between the voltage applied to the developing roller and the latent potential of the photosensitive member. Among these developing methods, the contact type has a problem of wear of the photosensitive member and the developing roller, while the non-contact type has the advantage of excellent resolution because the durability of the device is excellent and developed by electric force.

In general, in the electrophotographic image processing apparatus as described above, the developer means a state in which a carrier is mixed with the toner, and when the carrier is not used, the toner itself may be referred to as a developer. A nonmagnetic developer is a developer that moves by the fluidity of the developer particle itself without using a magnetic force. A magnetic developer is a phenomenon in which a magnetic material is moved by mixing magnetic materials such as ferrite in the developer. The non-magnetic developer does not use a magnetic material, so it is inexpensive and has advantages in color printing.

For toners for electrophotographic image forming apparatuses, there are requirements such as reduction of energy consumption, speed of printing speed, high image quality, and reduction of environmental load. In particular, in order to cope with environmental load reduction, it is necessary to improve the structure of resin used for binder resin.

In styrene-acrylate resins generally used conventionally, residual styrene monomers are a problem, and in polyester resins, bisphenol A or a derivative thereof, which is an environmental hormone, is a problem.

Bisphenol A or a derivative thereof has a residue of the formula

It is widely used to date as an alcohol component for synthesizing polyester resin. However, such bisphenol A or its derivatives have serious adverse effects on the environment and living bodies, and are known to cause serious problems when a large amount of toner for an electrophotographic image forming apparatus used in homes or offices is contained.

Therefore, as a solution to this problem, Japanese Patent Laid-Open Nos. 2004-126544, 2004-126545 and the like propose polyester resins containing no bisphenol A-based components, but this also has sufficient durability. There was a problem that no fixation was obtained.

Accordingly, the present invention solves the problems of the prior art, and has excellent physical properties such as durability, fixability, and dispersibility, but is less concerned about environmental pollution and harmless to the human body. An image forming apparatus is provided.

The present invention to achieve the above technical problem,

A toner for an electrophotographic image forming apparatus comprising a binder resin, a colorant, a mold release agent, and a charge control agent, wherein the binder resin is a polyester resin prepared by a polycondensation reaction of an alcohol monomer and a carboxylic acid monomer, and the alcohol resin There is provided a toner for an electrophotographic image forming apparatus, wherein the monomer contains bisphenol A or a derivative component thereof in an amount of 0.7 mol% or less.

The present invention to achieve the above other technical problem,

An electrophotographic image forming apparatus comprising a toner supply means, a developing means, a transfer means, and a fixing means, wherein the fixing means is in contact with the toner and is a toner contact member made of a roller or a belt, and the toner contact member is opposed to a roller or An electrophotographic image forming apparatus comprising an opposing member made of a belt.

Hereinafter, the present invention will be described in more detail.

The present invention provides a toner for an electrophotographic image forming apparatus including a polyester-based binder resin, a colorant, a mold release agent, and a charge control agent, by minimizing the content of bisphenol A or a derivative thereof used in the polycondensation reaction of the binder resin, The present invention relates to a toner for an electrophotographic image forming apparatus which is excellent in physical properties such as fixability and dispersibility, and which is less concerned about environmental pollution and harmless to human body.

In general, binder resins that can be used in toners for electrophotographic imaging apparatuses include polystyrene-co-butadiene, polystyrene-co-acrylonitrile, modified acrylic polymers, polyvinyl acetate, styrene-alkyd resins, and soya-alkyl. Resins, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polycarbonate, polyacrylic acid, polyacrylates, polymethacrylates, styrene polymers, polyvinyl butyral, alkyd resins, polyamides Drewes, polyurethanes, polyesters, polysulfones, polyethers, polyketones, phenoxy resins, epoxy resins, silicone resins, polysiloxanes, poly (hydroxyether) resins, polyhydroxystyrene Resins, novolacs, poly (phenylglycidylether) -co-dicyclopentadienes, copolymers of monomers used in the aforementioned polymers Polymer, and which is a combination, particularly a polyester-based resin is suitable for a color developer is excellent in fixing performance and transparency.

Conventionally, polyester resins have been generally prepared by polycondensation reactions of alcohol monomers and carboxylic acid monomers. As alcohol monomers, polyhydric alcohols such as diols or triols are used, and carboxylic acids are used as dicarboxylic acids. Or trivalent or higher polyhydric carboxylic acid was used to control toner properties such as molecular weight, molecular weight distribution, crosslink density and the like.

In particular, bisphenol A or a derivative thereof used as an alcohol monomer has been widely used because it is an important monomer for controlling the structure of a polyester. However, in recent years, environmental pollution and human hazards caused by bisphenol A have been highlighted, and thus, various alcohol components have been developed to replace bisphenol A.

In the conventional polyester resin, bisphenol A or its derivative was contained in a large amount, normally 10 mol% or more as a monomer of an alcohol component. However, in the present invention, by significantly lowering the content of such bisphenol A to be 0.7 mol% or less in the total alcohol component, the problem of environmental pollution caused by the conventional bisphenol A or its derivatives is remarkably improved.

Preferably, the alcohol monomer may include, in addition to bisphenol A or derivatives thereof, aliphatic alcohols having 2 to 15 carbon atoms such as ethylene glycol and propylene glycol, naphthalene alcohols, other diols and polyols that do not cause environmental load, and the like. have.

The molecular weight distribution in the final toner of the binder resin used in the present invention preferably has a ratio Mw / Mn of 2 to 40 in terms of weight average molecular weight (Mw) and number average molecular weight (Mn), when Mw / Mn is less than 2. This is because there is a problem of high temperature fixing failure, and if it exceeds 40, there is a problem of low temperature fixing failure.

The polyester resin of the present invention has a residue of an acid or an alcohol remaining after the reaction, and has a predetermined acid value and a hydroxyl value. The preferred acid value in the present invention is 40 mg KOH / g or less, and a preferable hydroxyl value. Is at least 2 mg KOH / g. If the acid value exceeds 40 mg KOH / g or the hydroxyl value is less than 2 mg KOH / g, the dispersion of the charge control agent and the pigment becomes poor, which is not preferable because there is a problem of deterioration of image quality at high temperature and high humidity.

In the toner according to the present invention, the content of the polyester resin used as the binder resin is preferably 80 to 95% by weight based on the total weight of the toner, which is optical when the content of the binder resin exceeds 95% by weight. This is because there is a problem that the density is low, the charging becomes poor, and when it is less than 80 wt%, there is a problem of fixing failure, which is not preferable.

In the toner according to the present invention, as the release agent, carnauba, candelilla, rice wax, petroleum-derived or Fischer-Tropsh-derived hydrocarbon wax, ester wax, etc. may be used. If the content is 0.5% by weight or more, the fixing performance can be further improved. In addition, even in the case of using a combination of a plurality of release agents from the release agents can achieve good fixability, in this case, the total addition amount of the release agent is preferably from 1.0% by weight to 8% by weight.

If the content of the release agent is more than 8% by weight, there is a problem in that image defects are generated, and if the content of the release agent is less than 1.0% by weight, there is a problem in that the fixing area is narrowed, which is not preferable.

In addition, in the toner according to the present invention, as the colorant, pigments of yellow, cyan, magenta, and black series may be used as the pigments used in ordinary color toners. As the yellow pigment, azo-based pigments such as PY 17 and 74, benzimidazoline and isoindolin-based pigments such as PY 180 and 185 may be used, and as magenta pigments, azo-based compounds such as PR 57: 1 and 238 and PR Quinacridone pigments such as 122 may be used. As the cyan pigment, phthalocyanine-based pigments represented by PB 15: 3 or 15: 4 may be used. Carbon black is usually mainly used as the black pigment, but in order to further improve the clean feeling, a blue dye and a pigment may be used, or a pigment other than carbon black may be used.

The content of the colorant in the toner according to the present invention is preferably 2 to 8% by weight based on the total weight of the toner, which is poor in charging when the content of the colorant is more than 8% by weight, resulting in a decrease in transparency. In the case of less than 2% by weight, the optical density is low, which is not preferable.

In the toner according to the present invention, a positive or negative charge control agent may be used as the charge control agent, depending on the development process adopted, but may include at least one element selected from boron, aluminum, zinc, and silicon, or It is preferred to include at least one of the compounds having a calixarene structure.

The content of the charge control agent is preferably 0.5 to 8% by weight based on the total weight of the toner. When the content of the charge control agent exceeds 8% by weight, poor image quality occurs due to overcharging, and fixing is poor. If the amount is less than 0.5% by weight, there is a problem in that charging control is not effective.

Hereinafter, a manufacturing method of a toner according to the present invention will be described.

First, a masterbatch, a charge control agent (CCA), and a release agent of a binder resin and a pigment are mixed. In this case, the master batch uses a pigment / binder resin having a weight ratio of 30/70 to 60/40. In addition, the binder resin does not become a base, and it is also possible to use a master batch with a pigment based on a release agent.

Such raw materials for toner are first mixed in the ratio as described above, and the mixed raw materials are heated and melt kneaded. Since the kneader affects the dispersion state of raw materials, it is necessary to select an appropriate one. In general, an open type continuous kneader or batch type kneader represented by biaxial extrusion, kneadex may be used. .

After heating and dissolving and kneading, the pulverization is achieved by cooling rapidly. The particle size after defect grinding | pulverization differs depending on the grinder used, but is about 20-500 micrometers. Subsequently, toner is produced by pulverizing and classifying the faulty pulverized product, but the pulverized pulverizer used at this time can be used such as a mechanical pulverizer or an impact pulverizer. A variety of classifiers can be used, including classifiers and three product classifiers represented by Elbow-Jet.

The finished toner powder is completed by externally adding a predetermined external additive and filtering through a sieve. The external additives usable include at least one of hydrophobized silica or titania, and if necessary, hydrophobized inorganic metal oxides such as Al ₂ O ₃ , cerium oxide, barium titanate or sodium strontium, zinc stearate and the like. For example, the metal soap may be included in an amount of 0.01 to 5% by weight.

For mixing the toner powder and the external additive, a conventional Henshel mixer, a Loedige mixer, or a Q-mixer can be used, and the linear velocity of the outermost circumference of the stirring blade is It is preferably in the range of 3-100 m / s.

Although classification is suitable to use the sieve of 75-150 micrometers of hole diameters, it can also be changed as needed.

In general, in the toner according to the present invention, the weight average particle diameter (median of the weight distribution) of the toner is excessively large or excessively small, and it is easy to cause a defect during the development process. The number of particles having a particle size of 50% or less of the weight average particle size is preferably 8 μm or less by weight average distribution, and the number of particles having a particle size of 2 times or more of the weight average particle size is 5 by weight average distribution. It is preferable that it is% or less.

The toner produced as described above can achieve very good results, particularly when applied to the one-component developing system which constitutes the developer with only the toner. In the case of the one-component developing method, it is applicable to either the contact developing method in which the toner layer on the developing roller and the surface of the photoconductor are substantially in contact, or the non-contact developing method having a gap of substantially 50 to 500 µm. Furthermore, in the case of the one-component system, since the time for toner charging is extremely short compared with the two-component system, the initial start of toner charging is required quickly, and the toner according to the present invention satisfies this requirement.

After the development, the toner image transferred to paper or other media is fixed, but in order to obtain more sufficient fixability, it is preferable to use a special fixing unit as described below.

That is, in the present invention, even in the case of using an alcohol monomer having a low bisphenol A or its derivative content as described above, the fixing performance is not deteriorated at all as compared with a conventional electrophotographic image forming apparatus. There is such an effect, in an electrophotographic image forming apparatus comprising a toner supply means, a developing means, a transfer means, and a fixing means, wherein the fixing means is in contact with the toner and is a roller or belt toner contact member, and the toner contact member. It is achieved by an electrophotographic image forming apparatus characterized by including an opposing member opposed to and made of a roller or belt.

Preferably, at least one of the toner contact member and the opposing member includes toner heating means, and the heating means is at least one heating means selected from the group consisting of a heating coil, induction heating and a planar heater.

2 shows a toner contact member 21 and an opposing member 22 of an electrophotographic image forming apparatus according to a preferred embodiment of the present invention. In the illustrated example, the toner contact member 21 and the opposing member ( It can be seen that 22 is provided in the form of a roller, and the heating means 23 is provided on the inner surface of the toner contact member 21.

A fixing apparatus of a conventional conventional image forming apparatus has one heating roller, and has a halogen lamp in at least one of the rollers, and performs a fixing function by transferring heat generated therefrom to the roller by radiation. However, this method has a disadvantage in that it is not suitable for application to the toner according to the present invention, because it is difficult to precisely control the temperature.

The present invention provides an electrophotographic image forming apparatus wherein the toner contact member is a roller or a belt, and the opposing member is also a roller or a belt, wherein the toner contact member and the opposing member are substantially in the case of not performing a fixing function. Is in contact.

The roller is selected from a hard roller having a metal or a coating layer coated on the metal, or a soft roller using a silicon or fluorine-based elastic member.

Examples of the belt include heat-resistant resins including polyimide, metals such as nickel, composites thereof, and the like. At least one of the fixing members is provided with a heating means, which is an e-coil heating means wound with a coil field heater, IH, that is, an induction heating method using high frequency, or thin The heating means etc. of the system of pre-heating are provided by providing a surface heater inside a belt and passing it through a belt.

The image forming apparatus according to the present invention includes a heating means in the above-described manner, which makes it possible to narrow the control width of the fixing temperature and short the warm-up time. Therefore, when used in combination with the toner according to the present invention, An extremely good fixing performance can be obtained.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples.

Example

Example 1

Polyesters having a content of bisphenol A and its derivatives of 0.5 mol% or less with respect to the alcohol component were synthesized by the polycondensation reaction method. Four color toners were prepared using the synthesized resin.

For yellow, magenta, cyan, and black, the pigments were PY 74,? PR 57: 1, PB 15: 3,?, And carbon black, respectively. For the yellow, magenta, and cyan pigments, a master batch was produced on three rollers using polyester such as polyester for toner such that pigment / resin = 40/60. The amount of the pigment added was 3% by weight based on the total weight of the toner. The charge control agent added 1.5% by weight of the compound containing boron. The release agent used 1.5% by weight of carnauba wax and 1.0% by weight of candellila wax.

The mixture was heated and kneaded in an open continuous heat kneader and subjected to cold grinding, pulverization, and classification, so that the weight average particle diameters (D ₅₀ ) of yellow, cyan, magenta, and black were 7.2, 7.5, 7.7, and A color toner of 7.6 mu m was obtained.

The toner prepared as described above was put into a full color printer (CLP500, manufactured by Samsung), and a full color image was output. The developing method of the printer was a one-component method of forming a toner layer on a developing roller having a surface of an elastic member, and a non-contact method having a gap of 150 占 퐉 substantially between the developing roller and the photosensitive member.

The fuser unit has two rollers with fluorine rubber on the surface of 35 mm in diameter, and the roller on the side where the toner contacts is an e-coil type with a metal roller and a coil field heater inside the fluorine rubber. The temperature was controlled to be 170 ± 10 ° C. The images output from the printer had sufficient fixability with solid and halftone images, and maintained high quality up to 5000 sheets.

In addition, solid images of Y, M, C, K, R, G, and B are printed on premium paper (75 g / m ² ) manufactured by Samsung, and then the glossiness is determined by a Gardner microtrigloss meter. Using a (type 4430) with a reflection angle of 60 °, it was found to have a high glossiness of 8.5 ± 1.5.

Example 2

Polyesters having a content of bisphenol A and its derivatives of 0.2 mol% or less with respect to the alcohol component were synthesized by the polycondensation reaction method. Four color toners were prepared using the synthesized resin.

For yellow, magenta, cyan, and black, the pigments were PY 74,? PR 57: 1, PB 15: 3,?, And carbon black, respectively. For the yellow, magenta, and cyan pigments, a master batch was produced on three rollers using polyester such as polyester for toner such that pigment / resin = 40/60. The amount of the pigment added was 3% by weight based on the total weight of the toner. The charge control agent added 1.0 wt% of the carix arene-based compound containing no metal. The release agent was added 1.5% by weight of rice wax.

The mixture was heated and kneaded in an open continuous heat kneader, and subjected to cold grinding, pulverization, and classification, so that the weight average particle diameters (D ₅₀ ) of yellow, cyan, magenta, and black were 7.0, 7.1, 6.8, and A color toner of 7.3 mu m was obtained.

The toner prepared as described above was put into a full color printer (CLP500, manufactured by Samsung), and a full color image was output. The developing method of the printer was a one-component method of forming a toner layer on a developing roller having a surface of an elastic member, and the non-contact method having a gap of 150 占 퐉 substantially between the developing roller and the photosensitive member.

The fuser unit has two rollers with fluorine rubber on the surface of 35 mm in diameter, and the roller on the side where the toner contacts is an e-coil type with a metal roller and a coil field heater inside the fluorine rubber. The temperature was controlled to be 170 ± 10 ° C. The images output from the printer had sufficient fixability with solid and halftone images, and maintained high quality up to 5000 sheets.

In addition, solid images of Y, M, C, K, R, G, and B are printed on premium paper (75 g / m ² ) manufactured by Samsung, and then the glossiness is determined by a Gardner microtrigloss meter. Using a (type 4430) with a reflection angle of 60 °, it was found to have a high glossiness of 9.0 ± 1.5.

Comparative Example 1

A polyester having a content of bisphenol A and its derivatives of 0.5 mol% based on the alcohol component was synthesized by the polycondensation reaction method. Four color toners were prepared using the synthesized resin.

For yellow, magenta, cyan, and black, the pigments were PY 74,? PR 57: 1, PB 15: 3,?, And carbon black, respectively. For the yellow, magenta, and cyan pigments, a master batch was produced on three rollers using polyester such as polyester for toner such that pigment / resin = 40/60. The amount of the pigment added was 3% by weight based on the total weight of the toner. The charge control agent added 1.0 wt% of the carix arene-based compound containing no metal. The release agent was added 1.5% by weight of rice wax.

The mixture was heated and kneaded in an open continuous heat kneader, and subjected to cold grinding, pulverization, and classification, so that the weight average particle diameters (D ₅₀ ) of yellow, cyan, magenta, and black were 7.8, 7.9, 8.1, and A color toner of 8.2 mu m was obtained.

The toner prepared as described above was put into a full color printer (CLP500, manufactured by Samsung), and a full color image was output. The developing method of the printer was a one-component method of forming a toner layer on a developing roller having a surface of an elastic member, and a non-contact method having a gap of 150 占 퐉 substantially between the developing roller and the photosensitive member.

The fixing unit was equipped with a 500 W halogen lamp inside both rollers having fluorine rubber on the surface having a diameter of 35 mm, and the surface temperature was controlled to be 180 ± 15 ° C. The image output from the printer did not have sufficient fixability, and an offset phenomenon occurred at a high temperature.

Comparative Example 2

Polyesters having a content of bisphenol A and its derivatives of 1.5 mol% based on the alcohol component were synthesized by the polycondensation reaction method. Four color toners were prepared using the synthesized resin.

For yellow, magenta, cyan, and black, the pigments were PY 74,? PR 57: 1, PB 15: 3,?, And carbon black, respectively. For the yellow, magenta, and cyan pigments, a master batch was produced on three rollers using polyester such as polyester for toner such that pigment / resin = 40/60. The amount of the pigment added was 3% by weight based on the total weight of the toner. The charge control agent added 1.0 wt% of the carix arene-based compound containing no metal. The release agent was added 1.5% by weight of rice wax.

The mixture was heated and kneaded in an open continuous heat kneader, and subjected to cold grinding, pulverization, and classification, so that the weight average particle diameters (D ₅₀ ) of yellow, cyan, magenta, and black were 8.8, 8.9, 8.6, and A color toner of 8.2 mu m was obtained.

The toner prepared as described above was put into a full color printer (CLP500, manufactured by Samsung), and a full color image was output. The developing method of the printer was a one-component method of forming a toner layer on a developing roller having a surface of an elastic member, and a non-contact method having a gap of 150 占 퐉 substantially between the developing roller and the photosensitive member.

The fuser unit has two rollers with fluorine rubber on the surface of 35 mm in diameter, and the roller on the side where the toner contacts is an e-coil type with a metal roller and a coil field heater inside the fluorine rubber. The temperature was controlled to be 170 ± 10 ° C. The image output from the printer did not have sufficient fixability with a solid or halftone image, and an offset phenomenon occurred at a low temperature.

Comparative Example 3

A polyester having a content of bisphenol A and its derivatives of 0.5 mol% based on the alcohol component was synthesized by the polycondensation reaction method. Four color toners were prepared using the synthesized resin.

For yellow, magenta, cyan, and black, the pigments were PY 74,? PR 57: 1, PB 15: 3,?, And carbon black, respectively. For the yellow, magenta, and cyan pigments, a master batch was produced on three rollers using polyester such as polyester for toner such that pigment / resin = 40/60. The amount of the pigment added was 3% by weight based on the total weight of the toner. The charge control agent added 1.0 wt% of the carix arene-based compound containing no metal. The release agent was added 1.5% by weight of rice wax.

The mixture was heated and kneaded in an open continuous heat kneader, and subjected to cold grinding, pulverization, and classification, so that the weight average particle diameters (D ₅₀ ) of yellow, cyan, magenta, and black were 8.8, 8.9, 8.6, and A color toner of 8.2 mu m was obtained.

The toner prepared as described above was put into a full color printer (CLP500, manufactured by Samsung), and a full color image was output. The developing machine was a two-component developing machine using a developer in which a Zn-Cr based ferrite having an average particle diameter of 35 µm and a toner had a weight ratio of 90/10.

The image output from the printer was so low in image density that a practical printing process was not possible.

According to the present invention, it is possible to provide a toner and an electrophotographic image forming apparatus employing the same, which are excellent in durability and fixability and have no fear of environmental pollution and are harmless to humans.

Claims (5)

A toner for an electrophotographic image forming apparatus comprising a binder resin, a colorant, a mold release agent, and a charge control agent, wherein the binder resin is a polyester resin prepared by a polycondensation reaction of an alcohol monomer and a carboxylic acid monomer, and the alcohol resin A toner for an electrophotographic image forming apparatus, wherein the monomer contains bisphenol A or a derivative component thereof in an amount of 0.2 mol% to 0.7 mol%. The method of claim 1, And the alcohol monomer is one or more alcohol monomers selected from the group consisting of aliphatic alcohols having 2 to 15 carbon atoms, naphthalene alcohols, diols, and polyol monomers. The method of claim 1, The content of the polyester resin is 80 to 95% by weight based on the total weight of the toner, the content of the colorant is 2 to 8% by weight based on the total weight of the toner, and the content of the sibling is 1.0 to 8% by weight based on the total weight of the toner And the content of the charge control agent is 0.5 to 8% by weight based on the total weight of the toner. An electrophotographic image forming apparatus comprising a toner supply means, a developing means, a transfer means, and a fixing means, wherein the fixing means is in contact with the toner and is a toner contact member made of a roller or a belt, and the toner contact member is opposed to a roller or Including a belt opposing member, In the toner for an electrophotographic image forming apparatus including a binder resin, a colorant, a mold release agent, and a charge control agent, the binder resin is a polyester resin prepared by a polycondensation reaction of an alcohol monomer and a carboxylic acid monomer, An electrophotographic image forming apparatus, wherein the alcohol monomer contains bisphenol A or a derivative component thereof in an amount of 0.2 mol% to 0.7 mol%. The method of claim 4, wherein At least one of the toner contact member and the opposing member includes toner heating means, and the heating means is at least one heating means selected from the group consisting of a heating coil, an induction heating and a planar heater. Device.

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