KR101665507B1 - Electrophotographic toner and process for preparing the same - Google Patents

Abstract

There is provided an electrophotographic toner and a method of manufacturing the same, wherein the toner is an electrophotographic toner comprising a latex, a colorant and a releasing agent, wherein the toner contains about 3 to about 1,000 ppm of Si and Fe, Is in the range of about 0.1 to about 5 and the starting temperature of the peak of maximum endothermic peak at the time of temperature rise in the DSC endothermic curve of the toner measured by differential scanning calorimetry is about 68 to about 89 DEG C and the peak temperature of the maximum endothermic peak curve RTI ID = 0.0 > 89 C. < / RTI >

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic toner,

An electrophotographic toner and a method for producing the same are disclosed.

In the electrophotographic method or the electrostatic recording method, a developer for visualizing an electrostatic latent image or an electrostatic latent image includes a two-component developer composed of toner and carrier particles, and a one-component developer substantially consisting of only toner and not using carrier particles. A one-component developer includes a magnetic one-component developer containing a magnetic component and a non-magnetic one-component developer containing no magnetic component. In the non-magnetic one-component developer, a fluidizing agent such as colloidal silica is often added independently in order to improve the fluidity of the toner. As the toner, generally colored particles obtained by dispersing pigments such as carbon black or other additives in latex are used.

The toner is produced by a pulverization method and a polymerization method. In the pulverization method, a synthetic resin, a pigment and, if necessary, other additives are melt-mixed and pulverized, and then classified to obtain particles having a desired particle size to obtain a toner. In the polymerization method, a polymerizable monomer composition is prepared by uniformly dissolving or dispersing various additives such as a pigment, a polymerization initiator, a cross-linking agent and an antistatic agent, if necessary, into a polymerizable monomer. Subsequently, an aqueous dispersion medium containing a dispersion stabilizer, To form fine droplet particles of the polymerizable monomer composition, followed by elevating the temperature and suspending to obtain a polymerized toner which is colored polymer particles having a desired particle size.

In an image forming apparatus such as an electrophotographic apparatus or an electrostatic recording apparatus, an image is formed on a uniformly charged photoreceptor to form an electrostatic latent image. Toner is attached to the electrostatic latent image to form a toner image. And then the unfixed toner image is fixed on the transfer material by various methods such as heating, pressurization, solvent vapor, and the like. In a fixing step, in most cases, a toner is transferred between a fixing roll and a pressing roll through a transfer material having a toner image transferred thereon, and the toner is heat-pressed and fused onto the transfer material.

An image formed by an image forming apparatus such as an electrophotographic copying machine is required to be improved in precision and fineness. Conventionally, as the toner used in the image forming apparatus, the toner obtained by the pulverization method was the main stream. The pulverization method tends to form colored particles having a wide particle diameter distribution. Therefore, in order to obtain satisfactory developing properties, it is necessary to classify the pulverized product to a narrower particle diameter distribution to some extent. However, in the conventional kneading / pulverizing process for producing toner particles suitable for the electrophotographic process or the electrostatic recording process, it is difficult to precisely control the particle size and particle size distribution, and the yield of toner production due to classification in the production of small particle size toners is reduced. Further, there is a problem that the change / adjustment of the toner design for the charging property and the fixing property is restricted. Therefore, polymerized toners, which have recently been easily controlled in particle size and do not have to undergo complicated manufacturing processes such as classification, have been attracting attention.

When a toner is produced by such a polymerization method, a polymerized toner having a desired particle size and particle size distribution can be obtained without pulverization or classification. However, even when such a polymerization method is used, aggregation of the latex and the coloring agent is not efficient, and there is a problem that the aluminum-based material used as the coagulating agent is harmful to the environment and human body.

In addition, it is possible to control the capsule structure of the toner structure through the coagulation process control in order to make the high gloss of the toner and the wide fixing region compatible, which surely suppresses the surface exposure of the pigment and the releasing agent, It contributes to the castle to some extent. However, when a releasing agent having a low melting point and a low viscosity is added in a large amount to improve the glossiness in a glossy paper, the low molecular weight portion of the releasing agent and the resin may be somewhat miscible with each other, There is a problem with fluidity.

According to an embodiment of the present invention,

An electrophotographic toner comprising a latex, a colorant, and a releasing agent,

Wherein the toner comprises about 3 to about 1,000 ppm Si and Fe,

Wherein the molar ratio of Si and Fe is from about 0.1 to about 5,

Wherein the DSC endothermic curve of the toner measured by a differential scanning calorimeter is in the range of about 68 to about 89 DEG C at the start temperature of the maximum endothermic peak curve at the temperature rise and the peak temperature of the maximum endothermic curve is about 86 to about 89 DEG C. For example.

The difference between the Tg of the latex and the Tg of the toner may be about 6.4 to about 12.0 ° C.

The releasing agent may include an ester group.

The release agent may be a mixture of a paraffin wax and an ester wax; Or an ester group-containing paraffin wax.

The release agent may include 100 parts by weight of paraffin wax and about 12.5 to about 50 parts by weight of the ester wax.

The toner may have an average particle size of from about 3 to about 8 microns.

The average circularity of the toner may be from about 0.940 to about 0.980.

The average circularity difference of the toner having an average particle size of about 2 mu m and about 5 mu m among the toner may be about 0.020 or less.

The GSDp and GSDv values of the toner may be about 1.25 or less.

According to another embodiment of the present invention,

Mixing a primary latex, a colorant dispersion, and a release agent dispersion to prepare a mixture;

Adding a flocculant to the mixed liquid to prepare a primary aggregated toner; And

A process for producing an electrophotographic toner comprising a step of coating a secondary latex prepared by polymerizing at least one polymerizable monomer onto the primary aggregated toner to prepare a secondary aggregated toner,

Wherein the toner comprises about 3 to about 1,000 ppm Si and Fe,

Wherein the molar ratio of Si and Fe is from about 0.1 to about 5,

Wherein a DSC endothermic curve of the toner measured by a differential scanning calorimeter has a starting temperature of a maximum endothermic peak curve at a temperature elevation of about 68 to about 89 DEG C and a peak temperature of the maximum endothermic peak curve of about 86 to about 89 DEG C A method for producing a photographic toner is provided.

Primary latex The primary latex is a polyester alone; a polymer obtained by polymerizing one or more polymers; Or a mixture thereof.

The manufacturing method may further include coating a tertiary latex prepared by polymerizing at least one polymerizable monomer onto the secondary aggregation toner.

The polymerizable monomer may be a styrene-based monomer; Acrylic acid, methacrylic acid; (Meth) acrylic acid derivatives; Ethylenically unsaturated monoolefins; Vinyl halide; Vinyl esters; Vinyl ether; Vinyl ketone; And a nitrogen-containing vinyl compound.

Wherein the release agent dispersion is a mixture of a paraffin-based release agent and an ester-based release agent; Or an ester group-containing paraffin-based release agent.

The coagulant may be a metal salt containing Si and Fe.

The coagulant may comprise polysilica iron.

According to another embodiment of the present invention,

A toner tank in which toner is stored; A supply unit for supplying the stored toner to the outside; And a toner agitating member which is installed to be rotatable inside the toner tank and is capable of agitating the toner in the inner space of the toner tank, wherein the toner has a particle diameter of about 3 to about 1,000 ppm Si and Fe, wherein the molar ratio of Si and Fe is about 0.1 to about 5, and the DSC endothermic curve of the toner, measured by a differential scanning calorimeter, has a starting temperature of the peak of the maximum endothermic peak at a temperature rising of about 68 to about 89 Lt; 0 > C and the peak temperature of the maximum endothermic curve is about 86 to about 89 [deg.] C.

According to another embodiment of the present invention,

Consultation delay; Image forming means for forming an electrostatic latent image on the surface of the image carrier; Means for containing the toner; Toner supplying means for supplying the toner to the surface of the image carrier to develop the electrostatic latent image on the surface of the image carrier; And toner transferring means for transferring the toner image from the surface of the image carrier to a transfer material, wherein the toner contains about 3 to about 1,000 ppm of Si and Fe, and the molar ratio of Si and Fe is A DSC endothermic curve of the toner measured by a differential scanning calorimeter is from about 0.1 to about 5, a starting temperature of a maximum endothermic peak curve at a temperature elevation is about 68 to about 89 DEG C, a peak temperature of the maximum endothermic curve is about 86 Deg.] C to about 89 [deg.] C.

According to the embodiments of the present invention as described above, it is possible to manufacture an electrophotographic toner having a high gloss of an image and a wide fixing area by using a release agent which is harmless to the human body and environment and in which the compatibility of the toner with the latex component is differentiated .

Hereinafter, the present invention will be described in detail.

An electrophotographic toner according to the present invention is an electrophotographic toner comprising a latex, a colorant and a releasing agent, wherein the toner comprises about 3 to about 1,000 ppm of Si and Fe, And the peak temperature of the peak of the maximum endothermic peak is about 86 to about 89. The peak temperature of the peak of the maximum endothermic peak curve is in the range of about < RTI ID = 0.0 > / RTI >

From the analysis of the DSC endothermic curve of the toner obtained by using the differential scanning calorimeter (DSC), the behavior between the heat and the toner, that is, the thermal transfer to the toner and the change in the state of the toner can be known.

Particularly, from the DSC curve at the time of temperature rise, it is possible to observe a change in the state of the toner upon application of heat and an endothermic peak accompanied by transfer, melting or dissolution of the releasing agent component.

In the embodiment of the present invention, since DSC measurement measures the heat exchange of the toner and observes the behavior thereof, it is necessary to use a high-precision heat-resistant input compensation type differential scanning calorimeter based on the measurement principle. For example, DSC-7 (trade name) of Perkin Elmer may be used. In this case, it is appropriate to use a sample amount of about 10 to 15 mg for the toner sample or about 2 to 5 mg for the release agent sample.

The measurement can be carried out according to ASTM D3418-82. The sample (toner or releasing agent) was once heated to remove the thermal history and then cooled (warmed) and heated (heated) at a rate of 10 ° C / min at a temperature range of 0 ° C to 200 ° C, Obtain a curve. The temperature in the DSC endothermic curve according to an embodiment of the present invention is defined as follows with reference to Fig.

The rising temperature refers to the temperature when the peak curve is clearly separated from the base line, that is, the temperature when the differential value of the peak curve begins to increase from the positive value, or the temperature when the differential value of the peak curve changes from negative to positive .

The starting temperature is the temperature at the intersection of the line in the tangential direction and the base line at the point at which the differential value of the peak curve becomes the maximum.

The peak temperature is the peak temperature that peaked at the peak curve.

In the DSC endothermic curve of the toner according to an embodiment of the present invention measured by differential scanning calorimetry, the starting temperature of the maximum endothermic peak curve at a temperature rise is, for example, about 68 to about 89 캜.

When the starting temperature satisfies this range, the toner's storage stability and fluidity with respect to heat, and fixability of the toner can be improved.

Further, in the toner according to an embodiment of the present invention, the peak temperature of the maximum endothermic peak curve is, for example, about 86 to about 89 캜. At this time, when the peak temperature satisfies this range, the preservability and fluidity of the toner against heat, and the fixability of the toner can be improved.

Also, the rising temperature of the maximum endothermic peak curve is about 68 to about 89 캜, about 82 to about 89 캜. When the rising temperature satisfies this range, storage stability is improved by preventing long-term plasticity change from low temperature, and the melting temperature of the wax is not increased at the time of fixing, which is advantageous for low temperature fixing.

The electrophotographic toner comprises Si and Fe, wherein the content of Si and Fe is from about 3 to about 1,000 ppm. At this time, when the content of Si and Fe satisfies the above range, the chargeability of the toner is improved and contamination of the inside of the printer can be prevented.

The molar ratio (Si / Fe) of the Si and Fe components is, for example, about 0.1 to about 5, preferably about 0.15 to about 3. At this time, when the molar ratio satisfies this range, the cohesive force and chargeability of the toner can be improved at the time of toner production.

According to another embodiment of the present invention, there is provided a method for preparing a colorant, comprising: preparing a mixture by mixing a primary latex, a colorant dispersion, and a release agent dispersion; Adding a flocculant to the mixed liquid to prepare a primary aggregated toner; And a step of coating a secondary latex prepared by polymerizing at least one polymerizable monomer onto the primary agglomerated toner to prepare a secondary agglomerated toner, Wherein the molar ratio of Si and Fe is about 0.1 to about 5, and the DSC endothermic curve of the toner measured by a differential scanning calorimeter includes about 1,000 ppm of Si and Fe, 68 DEG C to about 89 DEG C and a peak temperature of the maximum endothermic curve is about 86 DEG C to about 89 DEG C.

Examples used as the coagulant, NaCl, MgCl _2, MgCl ₂ and _{8H 2 0, [Al 2 (} OH) n Cl 6-n] m (1≤n≤5, 1≤m≤10), (Al 2 (SO ₄ ) ₃揃 18H ₂ O, PAC (polyaluminum chloride), PAS (polyaluminum sulfate), PASS (polyaluminum sulfate silicate), ferrous sulfate, ferric sulfate, ferric chloride, Calcium, Si and Fe-containing metal salts, and mixtures thereof, but is not limited thereto.

The content of the flocculant is, for example, about 0.1 to about 10 parts by weight, about 0.5 to about 8 parts by weight, and about 1 to about 6 parts by weight, based on 100 parts by weight of the primary latex. At this time, when the content of the coagulant satisfies this range, the coagulation efficiency is improved and the chargeability and particle size distribution of the toner can be improved.

According to one embodiment of the present invention, the electrophotographic toner can use Si and Fe-containing metal salt as a coagulant in a toner manufacturing process, and as a result, the Si and Fe contents contained in the produced toner are, for example, about 3 To about 1,000 ppm, and from about 0.15 to about 3. At this time, when the content of Si and Fe satisfies the above range, the chargeability of the toner is improved and contamination of the inside of the printer can be prevented.

The above Si and Fe-containing metal salts include, for example, polysilica iron. In particular, by adding Si and Fe-containing metal salts in the toner manufacturing process according to the present invention, The size of the primary agglomerated toner is increased. Examples thereof include Poly Silica Iron, and specific examples thereof include PSI-025, PSI-050, PSI-085, PSI-100, PSI-200 and PSI-300 Can be used. For example, the physical properties and compositions of PSI-025, PSI-050, PSI-085, PSI-100, PSI-200 and PSI-300 are shown in Table 1 below.

Kinds PSI-025 PSI-050 PSI-085 PSI-100 PSI-200 PSI-300 Silica / Fe molar ratio (Si / Fe) 0.25 0.5 0.85 One 2 3 chief ingredient
density Fe (wt%) 5.0 3.5 2.5 2.0 1.0 0.8 SiO ₂ (wt%) 1.4 1.9 2.0 2.2 pH (1 w / v%) 2-3 Specific gravity (20 ° C) 1.14 1.13 1.09 1.08 1.06 1.04 Viscosity (mPa.S) 2.0 or higher Average molecular weight (Dalton) 500,000 Exterior Apparently a yellowish brown transparent liquid

By using the above-mentioned Si and Fe-containing metal salt as a coagulant in the toner manufacturing process, it is possible to perform the pulp hardening and to control the particle shape.

The coagulant may be added, for example, at a pH of 0.1 to 2.0, a pH of 0.3 to 1.8, and a pH of 0.5 to 1.6. At this time, when the pH at the time of adding the coagulant is within this range, handling is easy and the iron added to the coagulant improves the odor control on the chain transfer agent used in the production of the latex, that is, the sulfur-containing compound, .

The volume average particle size of the electrophotographic toner according to an embodiment of the present invention is, for example, from about 3 to about 8 占 퐉, from about 4 to about 7.5 占 퐉, from about 4.5 to about 7, and the average value of the circularity is, , About 0.940 to about 0.980, and about 0.960 to about 0.975.

Generally, the smaller the toner particles are, the more advantageous to obtain a high resolution and a high image quality, but at the same time, it is disadvantageous from the viewpoint of the transfer speed and the cleaning power, so it is important to have a proper particle size.

The volume average particle diameter of the toner can be measured by an electric resistance method.

When the volume average particle diameter of the toner satisfies the range of about 3 to about 8 mu m, the photoreceptor is easily cleaned and the mass production yield is improved, and the problem of human injury due to scattering is solved and an image of high resolution and high quality is obtained And the charge becomes uniform, the fixability of the toner is improved, and it is possible that the Dr-Blade regulates the toner layer.

When the average value of the circularity of the toner satisfies the range of about 0.940 to about 0.980, it is possible to prevent the image developed on the transferring material from having a large height or increasing the consumption amount of the toner, It is possible to improve the phenomenon that a sufficient coating rate on the developed image can not be obtained on the transfer material, and therefore, an excessive amount of toner is not required to obtain the required image density, and the toner consumption amount can be reduced. In addition, it is possible to prevent the toner from being excessively supplied onto the developing sleeve to cause the sleeve to be unevenly coated on the toner together with the toner to cause contamination.

The circularity of the toner can be measured with a FPIA-3000 instrument manufactured by SYSMEX Co., which is calculated according to the following formula.

<Formula>

Circularity = 2 × (π × area) ^0.5 / circumference

The circularity value is a value between 0 and 1, and the closer the circularity value is to 1, the closer to a sphere.

In particular, the average circularity difference of the toner having an average particle size of about 2 mu m and about 5 mu m among the toner is, for example, about 0.020 or less. At this time, when the average circularity difference is 0.020 or less, the uniformity of the particles is improved, the problem of cleaning in the image forming apparatus is improved, and contamination can be solved.

The volume average particle size distribution index GSDv or the number average particle size distribution index GSDp described below can be used as an index of the toner particle distribution, which is calculated and measured as follows.

First, the particle size distribution of the toner measured using a multisizer III (manufactured by Beckman-Coulter, Inc.) counter, which is a Coulter counter, is divided into a small particle diameter and a small particle diameter with respect to the volume and number of individual toner particles, ), And the particle diameter at which the cumulative distribution was 16% was defined as a volume average particle diameter D16v and a number average particle diameter D16p, and the particle diameter at which cumulative 50% was defined as a volume average particle diameter D50v and a number average particle diameter D50p do. Similarly, the particle diameter at which the cumulative value is 84% is defined as a volume average particle diameter D84v and a number average particle diameter D84p.

At this time, the volume average particle size distribution GSDv is defined as (D84v / D16v) ^0.5 , and the number average particle size index GSDp is defined as (D84p / D16p) ^0.5 . The index (GSDv) and the number average particle size index (GSDp) can be calculated.

At this time, the values of GSDv and GSDp are, for example, about 1.25 or less. When the values of GSDv and GSDp are about 1.25 or less, the particle size can be made uniform.

In the above production process, the primary latex may be a polymer prepared by using a polyester alone, or by polymerizing one or more polymerizable monomers, or a mixture thereof (hybrid type). When the polymer is used, it may be polymerized with a releasing agent such as wax in a polymerization process or may be mixed with a releasing agent separately.

The polymerization process produces a primary latex having a size of, for example, about 1 탆 or less, about 100 to about 300 nm, and about 150 to about 250 nm as the emulsion polymerization dispersion.

The polymerizable monomers used herein include styrene-based monomers of styrene, vinyltoluene, and? -Methylstyrene; Acrylic acid, methacrylic acid; Acrylates such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, dimethylaminoethyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, , (Meth) acrylic acid derivatives of dimethylaminoethyl methacrylate, acrylonitrile, methacrylonitrile, acrylamide and methacrylamide; Ethylenically unsaturated monoolefins of ethylene, propylene, and butylene; Vinyl chloride, vinylidene chloride, vinyl halides of vinyl fluoride; Vinyl esters of vinyl acetate and vinyl propionate; Vinyl methyl ether, vinyl ethyl ether of vinyl ethyl ether; Vinyl ketones such as vinyl methyl ketone and methyl isopropenyl ketone; Vinylpyridine, 2-vinylpyridine, 4-vinylpyridine, and N-vinylpyrrolidone nitrogen-containing vinyl compounds.

In the primary latex production process, a polymerization initiator and a chain transfer agent may be used for efficient polymerization.

Examples of the polymerization initiator include persulfates such as potassium persulfate and ammonium persulfate; 2-azobis (2-amidinopropane) dihydrochloride, 2, 3-azobis (2-aminopropanecarboxylic acid) Azobis-2-methyl-N-1,1-bis (hydroxymethyl) -2-hydroxyethylpropioamide, 2,2'-azobis (2,4-dimethylvaleronitrile), 2 , Azo compounds such as 2'-azobisisobutyronitrile and 1,1'-azobis (1-cyclohexanecarbonitrile); But are not limited to, methyl ethylperoxide, di-t-butyl peroxide, acetyl peroxide, dicumyl peroxide, lauroyl peroxide, benzoyl peroxide, Peroxides such as dicyclohexyl peroxide, oxy dicarbonate and di-t-butyl peroxyisophthalate. Further, an oxidation-reduction initiator in which these polymerization initiators and a reducing agent are combined can be mentioned.

The chain transfer agent refers to a substance that changes the type of the chain transfer agent in a chain reaction. And that the new chain has a markedly reduced activity over that of the previous one. Through the chain transfer agent, the polymerization degree of the polymerizable monomer can be reduced and a new chain can be initiated. The molecular weight distribution can be controlled through the chain transfer agent.

The amount of chain transfer agent is, for example, from about 0.1 to about 5 parts by weight, from about 0.2 to about 3 parts by weight, and from about 0.5 to about 2.0 parts by weight, based on 100 parts by weight of the at least one polymerizable monomer. When the content of the chain transfer agent satisfies this range, the molecular weight can be appropriately controlled, and the coagulation efficiency and fixing performance can be improved.

Examples of such chain transfer agents include, but are not limited to, sulfur containing compounds such as dodecanethiol, thioglycolic acid, thioacetic acid and mercaptoethanol; Phosphorous acid compounds such as phosphorous acid and sodium phosphite; Hypophosphorous acid compounds such as hypophosphorous acid and sodium hypophosphite; And alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol and n-butyl alcohol.

The primary latex may further include a charge control agent. In the charge control agent used in the present invention, both of the negative charge control agent and the positive charge control agent may be used. As the negative charge control agent, a chromium- organometallic complexes or chelate compounds such as azo dyes or monoazo metal complexes; Metal-containing salicylic acid compounds such as chromium, iron and zinc; And an organometallic complex of an aromatic hydroxycarboxylic acid and an aromatic dicarboxylic acid can be used, and there is no particular limitation as long as it is a known one. Examples of the positive charge control agent include nigrosine and a product thereof modified with a fatty acid metal salt or the like, a quaternary ammonium salt such as tributylbenzylammonium 1-hydroxy-4-naphthosulfonate and tetrabutylammonium tetrafluoroborate, And the like can be used singly or in combination of two or more. Such a charge control agent stably supports the toner on the developing roller by the electrostatic force, so that stable and fast charging speed becomes possible by using the above charge control agent.

The primary latex thus obtained is mixed with the colorant dispersion and the release agent dispersion to prepare a mixed solution. The colorant dispersion is obtained by homogeneously dispersing a composition containing a colorant such as black, cyan, magenta, or yellow and an emulsifier using an ultrasonic disperser or a microfludizer.

Among the colorants used in the colorant dispersion, carbon black or aniline black is used for black color, and at least one color selected from yellow, magenta and cyan colorants is used.

As the yellow colorant, condensed nitrogen compounds, isoindolinone compounds, atrazine compounds, azo metal complexes, or allyl imide compounds are used. Specifically, C.I. Pigment yellow 12, 13, 14, 17, 62, 74, 83, 93, 94, 95, 109, 110, 111, 128, 129, 147, 168,

The magenta colorant may be a condensed nitrogen compound, an anthraquin, a quinacridone compound, a base dye rate compound, a naphthol compound, a benzoimidazole compound, a thioindigo compound, or a perylene compound. Specifically, C.I. Pigment red 2, 3, 5, 6, 7, 23, 48: 2, 48: 3, 48: 4, 57: 1, 81: 1, 122, 144, 146, 166, 169, 177, 184, 185, 202, 206, 220, 221, or 254 may be used.

The cyan colorant may be a copper phthalocyanine compound or its derivative, an anthraquinone compound, or a base dye rate compound. Specifically, C.I. Pigment blue 1, 7, 15, 15: 1, 15: 2, 15: 3, 15: 4, 60, 62, or 66 may be used.

These colorants may be used singly or in a mixture of two or more thereof, and they are selected in consideration of color, saturation, lightness, weatherability, dispersibility in the toner, and the like.

The amount of the colorant as described above may be an amount sufficient to color the toner, but may be, for example, about 0.5 to about 15 parts by weight, about 1 to about 12 parts by weight, about 2 to about 12 parts by weight based on 100 parts by weight of the toner 10 parts by weight. When the content of the colorant satisfies this range, the coloring effect is sufficiently exhibited, the increase in the cost of the toner production is suppressed, and a sufficient triboelectric charge amount can be obtained.

As the emulsifier used in the colorant dispersion, emulsifiers known in the art can be used, and anionic emulsifiers, nonionic emulsifiers or mixtures thereof can be used. Examples of the anionic reactive emulsifier include HS-10 (manufactured by Dai-ichi Kogyo) and Dowfax 2A1 (manufactured by Rhodia). Examples of the nonionic reactive emulsifier include RN-10 (manufactured by Dai-ichi Kogyo) For example.

The release agent dispersion used in the toner manufacturing process includes a release agent, water, an emulsifier, and the like

At this time, since the release agent is fixed at a low fixation temperature on the final image receptor and provides a toner exhibiting excellent final image durability and abrasion resistance characteristics, the kind and content of the release agent plays an important role in determining the characteristics of the toner .

In particular, the difference (? Tg) between the Tg of the latex and the Tg of the toner containing the releasing agent before addition of the releasing agent shows compatibility between the latex and the toner. The smaller the compatibility of the releasing agent and the latex is, do. The smaller the compatibility of the release agent with the latex is, the higher the probability that the dispersion size of the release agent in the toner will be increased.

 In the toner according to the present invention, the difference (? Tg) between the Tg of the latex and the Tg of the toner is, for example, about 6.4 to about 12.0 ° C.

When the delta Tg satisfies the above range, the compatibility of the release agent and the latex is prevented from being excessively increased, and the possibility of the release agent projecting onto the toner surface is reduced. This results in mechanical stress and sufficient durability at the time of temperature rise in the apparatus, The fixing region can be increased and the high-temperature storability and fluidity can be improved.

The releasing agent that can be used in the present invention has a DSC endothermic curve measured by a differential scanning calorimeter of toner at a starting temperature of a maximum endothermic peak curve at a temperature rise of about 68 to about 75 캜 and a peak temperature of the maximum endothermic peak curve of about 77 ° C to about 85 ° C and the difference (? Tg) between the Tg of the latex and the Tg of the toner is about 6.4 to about 12.0 ° C.

Non-limiting examples of mold release agents that can be used include polyethylene waxes, polypropylene waxes, silicone waxes, paraffin waxes, ester waxes, carnauba waxes and metallocene waxes. The melting point of the release agent may be from about 50 to about 150 &lt; 0 &gt; C. The release agent component is physically in close contact with the toner particles, but does not bind covalently with the toner particles. To provide a toner that is fixed at a low fixation temperature on the final image receptor and exhibits excellent final image durability and abrasion resistance properties.

The release agent may be used in an amount of, for example, from about 1 to about 20 parts by weight, from about 2 to about 16 parts by weight, and from about 3 to about 12 parts by weight, based on 100 parts by weight of the at least one toner, When satisfied, the low temperature fixability is improved, the fixing temperature range is widened, and storage and economical efficiency can be increased.

As the release agent, a wax containing an ester group can be used. Examples thereof include (1) a mixture of an ester-based wax and a non-ester-based wax; Or (2) an ester group-containing wax containing an ester group in a non-ester-series wax.

Since the ester group has high affinity with the latex component of the toner, the wax can be uniformly present in the toner particles, so that the function of the wax can be effectively exerted. The ester-based wax component can be esterified with the latex Excessive waxing action can be suppressed in the case of constituting with only wax, and as a result, good developability of the toner can be maintained for a long period of time.

Examples of the ester-based wax include esters of a fatty acid having 15 to 30 carbon atoms and an alcohol having 1 to 5 carbon atoms, such as behenyl behenate, stearyl stearate, stearic acid ester of pentaerythritol, montanic acid glyceride, and the like Do. The alcohols constituting the ester are preferably those having 10 to 30 carbon atoms in the case of a monohydric alcohol, and those having 3 to 10 carbon atoms in the case of a polyhydric alcohol.

Examples of the non-ester-based waxes include polyethylene-based waxes and parisian waxes.

Examples of the ester group-containing wax include a mixture of a paraffin wax and an ester wax; Or an ester group-containing paraffin wax; and specific examples thereof include P-280, P-318 and P-319 of Chongqing Yuzen Kogyo Co., Ltd.

When the releasing agent is a mixture of paraffin wax and ester wax, the releasing agent includes, for example, 100 parts by weight of paraffin wax and about 12.5 to about 50 parts by weight of ester wax.

When the content of the ester wax and the paraffin wax is within the above range, the compatibility with the latex is improved, the plasticity of the toner is improved, and the developing property can be maintained for a long period of time.

The emulsifier used in the release agent dispersion may be an emulsifier known in the art, such as an anionic reactive emulsifier, a nonionic reactive emulsifier, or a mixture thereof, in addition to the emulsifier used in the colorant dispersion. Examples of the anionic reactive emulsifier include HS-10 (manufactured by Dai-ichi Kogyo) and Dowfax 2A1 (manufactured by Rhodia). Examples of the nonionic reactive emulsifier include RN-10 (manufactured by Dai-ichi Kogyo) For example.

Through this method, it is preferable that the molecular weight and T _g are adjusted so that the primary latex is favorable for low temperature fixation, and the rheological characteristics are controlled.

After mixing the primary latex and the dispersion of the colorant and the release agent dispersion obtained as described above, an aggregating agent is added to the mixed solution to produce an aggregated toner. More specifically, after mixing the primary latex, the colorant dispersion and the release agent dispersion, the flocculant is added under the condition of pH of 0.1 to 2.0 to form primary aggregation toner of 2.5 탆 or less which acts as a core, After the secondary latex is added and the pH in the system is adjusted to 6 to 8, if the particle size is kept constant for a certain time, the temperature is raised to 90 to 98 ° C and the pH is lowered to 5 to 6, Toner can be produced.

The secondary latex may be obtained by polymerizing one or more polymeric monomers as described above, and such polymerization may be effected by emulsion polymerization dispersion in the presence of a latex having a size of about 1 占 퐉 or less, preferably about 100 to about 300 nm . Such secondary latexes may also include waxes, which may be included in the secondary latex during polymerization.

On the other hand, it is possible to coat a tertiary latex obtained by polymerizing the above-mentioned one or more polymerizable monomers on the secondary aggregation toner.

By forming the shell layer with the secondary latex or the tertiary latex as described above, it becomes possible to improve the durability of the toner and to solve the toner storage problem in terms of shipping and handling. At this time, it is preferable to further add a polymerization inhibitor to prevent the formation of new latex particles, and to conduct the reaction under starved-feeding conditions so that the monomer mixture can be coated on the toner.

The secondary aggregated toner or the tertiary aggregated toner obtained as described above is filtered to separate and dry the toner particles. The dried toner is subjected to external addition using an external additive, and the charge amount and the like are adjusted to obtain a final dry toner.

As the external additive, silica, TiO ₂ or the like is used, and its content is For example, from about 1.5 to about 7 parts by weight, and from about 2 to about 5 parts by weight, based on 100 parts by weight of the extragranular toner. When the content of the external additive satisfies the above range, caking which is a phenomenon that the toner adheres to each other due to the cohesion force between the toners is prevented, the charge amount is stabilized, and the problem of contamination of the roller by the excess foreign matter component does not occur.

According to another embodiment of the present invention, there is provided an image forming method comprising a step of attaching toner to a surface of a photoconductor on which an electrostatic latent image is formed to form a visible image, and transferring the visible image to a transfer material, A colorant and a releasing agent, wherein the toner contains about 3 to about 1,000 ppm of Si and Fe, the molar ratio of Si to Fe is about 0.2 to about 0.8, and the toner measured by a differential scanning calorimeter The starting temperature of the maximum endothermic peak curve at a temperature elevation in the DSC endothermic curve is about 68 to about 89 DEG C and the peak temperature of the maximum endothermic curve is about 86 to about 89 DEG C. Representative electrophotographic imaging processes include a series of steps that form an image on a receptor, including charging, exposure, development, transfer, fusing, cleaning, and erasing steps.

In the charging step, the photoreceptor is covered with a charge of a desired polarity, which is either negative or positive, typically by a corona or a charging roller. In the exposure step, the optical system, typically a laser scanner or diode array, selectively discharges the charged surface of the photoreceptor in an imagewise manner corresponding to the target image formed on the final image receptor to form a latent image. Electromagnetic radiation, which may be referred to as "light ", may include, for example, infrared radiation, visible light, and ultraviolet radiation.

In the developing step, toner particles of suitable polarity generally contact a latent image on the photoreceptor, and typically use a developer electrically-biased developer having the same potential polarity as the toner polarity. The toner particles migrate to the photoreceptor and are selectively attached to the latent image by electrostatic force, forming a toned image on the photoreceptor.

In the transfer step, the toned image is transferred from the photoreceptor to the desired final image receptor, sometimes the intermediate transfer element is used to affect the transfer of the toned image from the photoreceptor to the final image receptor with subsequent transfer of the toned image .

In the fixing step, the toned image on the final image receptor is heated to soften or melt the toner particles, thereby causing the toned image to settle on the final receptor. Another method of fixing involves fixing the toner to the final receptor under high pressure with or without heat.

In the cleaning step, the residual toner remaining on the photoreceptor is removed.

Finally, in the erase step, the photoreceptor charge is exposed to light of a specific wavelength band and is reduced to a substantially uniformly low value, whereby the residual of the original latent image is removed and the photoreceptor is prepared for the next image forming cycle.

According to another embodiment of the present invention, there is provided an image forming apparatus comprising: a toner tank in which toner is stored; A supply unit for supplying the stored toner to the outside; And a toner agitating member which is rotatably installed inside the toner tank and is capable of agitating the toner in the inner space of the toner tank, wherein the toner is supplied to the toner tank in a range of about 3 to about 1,000 ppm of Si and Fe, wherein the molar ratio of Si and Fe is from about 0.1 to about 5, and the DSC endothermic curve of the toner, as measured by a differential scanning calorimeter, About 89 deg. C, and the peak temperature of the maximum endothermic curve is about 86 deg. C to about 89 deg.

FIG. 2 shows toner supplying means according to an embodiment of the present invention, which will be described below.

The toner supplying apparatus 100 includes a toner tank 101, a supplying portion 103, a toner conveying member 105, and a toner agitating member 110.

The toner tank 101 stores a predetermined amount of toner, and is formed into a substantially hollow cylindrical shape.

The supply unit 103 is installed in the inner lower portion of the toner tank 101 and discharges the toner stored in the toner tank 101 to the outside. In other words, the supply unit 103 protrudes in a columnar shape having a semicircular cross section inward from the bottom surface of the toner tank 101. A toner discharge port (not shown) is formed on the outer circumferential surface of the supply part 103 to discharge the toner.

The toner conveying member 105 is provided on the inner lower side of the toner tank 101 and on one side of the supplying unit 103. When the toner conveying member 105 is rotated, the toner in the toner tank 101 is conveyed to the supplying portion 103. The toner conveying member 105 is formed into a coil spring shape and has one end extended to the inside of the supplying portion 103. [ As shown in Fig. The toner conveyed by the toner conveying member 105 is discharged to the outside through the toner outlet.

The toner stirring member 110 is provided so as to be rotatable inside the toner tank 101 so that the toner stored in the toner tank 101 is moved downward. That is, when the toner stirring member 110 rotates at the center of the toner tank 101, the toner stored in the toner tank 101 is agitated and the toner is not hardened. Then, the toner is moved downward by its own weight. The toner stirring member 110 includes a rotating shaft 112 and a toner stirring film 120. The rotary shaft 112 is installed to be rotatable at the center of the toner tank 101 and a driving gear (not shown) is provided coaxially at one end protruding to one side of the toner tank 101. Therefore, when the driving gear rotates, the rotating shaft 112 rotates integrally. In addition, it is preferable that the blade plate 114 is formed on the rotary shaft 112 to facilitate the installation of the toner stirring film 120. At this time, it is preferable that the blade 114 is formed to be approximately symmetrical about the rotation axis 112. The toner stirring film 120 has a width corresponding to the inner length of the toner tank 101 and has an elasticity capable of being deformed along the protrusion on the inner side of the toner tank 101,

The toner agitating film 120 is preferably cut from the end of the toner agitating film 120 toward the rotating shaft 112 to form the first agitating part 121 and the second agitating part 122.

According to another embodiment of the present invention, there is provided an image forming apparatus comprising: a photosensitive member; Image forming means for forming an electrostatic latent image on the surface of the photoreceptor; Means for containing the toner; Toner supplying means for supplying the toner to the surface of the photoreceptor to develop the electrostatic latent image on the surface of the photoreceptor onto the toner; And toner transferring means for transferring the toner image from the surface of the photoreceptor to a transfer material, wherein the toner is an electrophotographic toner comprising latex, a colorant and a releasing agent, wherein the toner comprises about 3 to about 1,000 ppm Of Si and Fe, wherein the molar ratio of Si and Fe is from about 0.2 to about 0.8, and a DSC endothermic curve of the toner measured by a differential scanning calorimeter is about 68 to about 89 DEG C, and the peak temperature of the maximum endothermic peak curve is about 86 DEG C to about 89 DEG C.

FIG. 3 illustrates an example of an image forming apparatus of a non-contact development type in which a toner is prepared according to a manufacturing method according to an embodiment of the present invention. The operation principle will be described below.

The nonmagnetic one-component developer of the developing device 204 is supplied onto the developing roller 205 by a supplying roller 206 constituted by an elastic member such as a polyurethane foam, a sponge or the like. The developer 208 supplied onto the developing roller 205 reaches the contact portion between the developer regulating blade 207 and the developing roller 205 as the developing roller 205 rotates. The developer regulating blade 207 is made of an elastic member such as metal or rubber. The layer of the developer 208 is regulated as a constant layer between the contact portions of the developer regulating blade 207 and the developing roller 205 when the developer is passed therethrough to form a thin layer and sufficiently charge the developer. The thinned developer 208 is conveyed by the developing roller 205 to a developing region where the developer 208 is developed on the electrostatic latent image of the photoreceptor 201 as the image carrier. At this time, the electrostatic latent image is formed by scanning the photoconductor 201 with light 203.

The developing roller 205 is positioned facing the photoreceptor 201 without facing the photoreceptor 201 at a constant interval. The developing roller 205 rotates counterclockwise and the photoconductor 201 rotates clockwise.

The developer 208 transferred to the developing region of the photoreceptor 201 is transferred to the developing roller 205 by the DC superimposed AC voltage applied to the developing roller 205 and the potential difference between the AC voltage superimposed on the latent image of the photoreceptor 201 charged by the charging means 202 The electrostatic latent image formed on the photoconductor 201 is developed by the electric force generated by the potential difference to form a toner image.

The developer 208 developed on the photoreceptor 201 reaches the position of the transfer means 209 in accordance with the rotational direction of the photoreceptor 201. [ The developer developed on the photoreceptor 201 is transferred to the printing paper while the printing paper 213 passes by the transferring means 209 to which corona discharge or roller type reverse polarity high voltage to the developer 208 is applied, And an image is formed.

The image transferred onto the printing paper is fused to the printing paper while passing through a high-temperature and high-pressure fixing device (not shown), and the image is fixed. On the other hand, the undeveloped residual developer 208 'on the developing roller 205 is recovered by the supplying roller 206 in contact with the developing roller 205, 208 'are recovered by the cleaning blade 210. The above process is repeated.

The invention will be described in more detail with reference to the following examples, but the invention is not limited thereto.

The shape of the toner thus prepared was confirmed by SEM photographs, and the circularity of the toner can be measured with FPIA-3000 equipment manufactured by SYSMEX Co., which is calculated according to the following formula.

<Formula>

Circularity = 2 × (π × area) ^0.5 / circumference

The circularity value is a value between 0 and 1, and the closer the circularity value is to 1, the closer to a sphere.

Further, the volume particle diameter of the toner was measured using a Coulter counter (Multisizer 3, Beckman, USA).

Example 1

&Lt; Synthesis of primary latex >

(234 g of styrene, 96 g of n-butyl acrylate, 14 g of methacrylic acid and 6.5 g of polyethylene glycol-ethyl ether methacrylate) and 5 g of 1-dodecanethiol as a chain transfer agent (CTA) were added to a 3 L beaker, -10 aqueous solution of 3% and emulsified at 75 DEG C with an ultrasonic homogenizer. The prepared release agent / polymer dispersion was charged into a reactor heated to a reaction temperature of 80 캜, 860 g of 3.2% aqueous solution of potassium persulfate (KPS) as a polymerization initiator was added thereto, and the reaction was carried out for 2 hours under a nitrogen stream. After the reaction, 145 g of styrene, 66 g of n-butyl acrylate, 9 g of methacrylic acid and 3.3 g of 1-dodecanethiol were added to the reactor by stubbing feeding for 60 minutes and further reacted for 6 hours. Lt; / RTI &gt; The size of the toner latex particles after the reaction was measured by a light scattering method (Horiba 910) and the result was 140 nm.

&Lt; Preparation of colorant dispersion >

A total of 10 g of an anionic reactive emulsifier (HS-10; DAI-ICH KOGYO) and a nonionic reactive emulsifier (RN-10; DAI-ICH KOGYO) ), And 400 g of glass beads having a diameter of 0.8 to 1 mm were put into the milling bath and milled at room temperature to prepare a dispersion.

color Pigment type HS-10: RN-10 (weight ratio) size black Mogul-L  100: 0 130nm  80: 20 120 nm  0: 100 100 nm yellow PY-84  100: 0 350 nm  50: 50 290 nm  0: 100 280 nm magenta PR-122  100: 0 320nm  50: 50 300 nm  0: 100 290 nm draft PB 15: 4  100: 0 130nm  80: 20 120 nm  80: 30 120 nm

<Agglomeration and Toner Production>

A 1 L reactor was charged with 500 g of deionized water, 150 g of the above primary latex for core, 19.5% cyan colorant dispersion (HS-10 100%), And 15 g of nitric acid (0.3 mol) were added to a mixed solution containing 35 g of a release agent dispersion P-280 (paraffin wax component: 25-35 wt%, ester wax component: 5-10 wt% % PSI- (025) (available from Kankyo Kogyo Co., Ltd.), and the mixture was stirred at 11,000 rpm for 6 minutes using a homogenizer to obtain a primary agglomerated toner having a volume average particle diameter of 1.5 to 2.5 μm. The mixed solution was put into a 1 L double jacket reactor, and the temperature was raised from room temperature to 0.02 ° C per minute to 50 ° C (Tg-5 ° of latex). When the volume average particle diameter of the primary agglomerated toner reached about 5.8 mu m, 50 g of a secondary latex obtained by polymerizing the polystyrene type polymerizable monomer was added, and when the volume average particle diameter reached 6.0 mu m, NaOH (1 mol) was added The pH was adjusted to 7. When the value of the volume average particle diameter for 10 minutes was kept constant, the temperature was raised to 96 DEG C (0.5 DEG C / min). After reaching 96 캜, nitric acid (0.3 mol) was added to adjust the pH to 6.6, and if it was combined for 3 to 5 hours, a potato-shaped secondary agglomerated toner of 5 to 6 탆 was obtained. Then filtered through a process of cooling, the agglomerated reaction solution below the T _g of the toner particles were separated and dried.

0.5 parts by weight of NX-90 (Nippon Aerosil), 1.0 part by weight of RX-200 (Nippon Aerosil) and 0.5 parts by weight of SW-100 (Titan Kogyo) were added to 100 parts by weight of the dried toner particles, Tech) at 8,000 rpm for 4 minutes. Thus, a toner having a volume average particle diameter of 5.8 mu m was obtained. The GSDp and GSDv values of the toner were 1.29 and 1.24, respectively.

Example 2

Except for using P-318 (heavy-weight oil retaining) (paraffin wax component: 30-40 wt%, ester wax component: 1-5 wt%, melting point: 80 캜) instead of P-280 The toner was prepared in the same manner as in Example 1 above. The GSDp and GSDv values of the toner were 1.28 and 1.21, respectively.

Example 3

Except for using P-419 (heavyweight) (paraffin wax component: 20-30% by weight, ester wax component: 10-20% by weight, melting point: 88 占 폚) instead of P-280 The toner was prepared in the same manner as in Example 1 above. The GSDp and GSDv values of the toner were 1.27 and 1.21, respectively.

Example 4

Except for using P-420 (heavy-weight oil holding) (paraffin wax component: 25-35 wt%, ester wax component: 5-10 wt%, melting point: 89 ° C) instead of P-280 The toner was prepared in the same manner as in Example 1 above. The GSDp and GSDv values of the toner were 1.28 and 1.21, respectively.

Comparative Example 1

Except for using P-212 (heavy oil retaining) (paraffin wax component: 25-35 wt%, ester wax component: 5-10 wt%, melting point: 82 ° C) instead of P-280 The toner was prepared in the same manner as in Example 1 above. The GSDp and GSDv values of the toner were 1.30 and 1.23, respectively.

Comparative Example 2

Toner was prepared in the same manner as in Example 1 except that HNP-100 (heavy-weight oil holding) (melting point: 90 ° C), which is a paraffin wax, was used instead of P-280 The GSDp and GSDv values of the toner were 1.27 and 1.24, respectively.

Evaluation of physical properties of toner

Evaluation of fixing area of toner

- Equipment: Belt-type fixing machine

- Unfixed images for test: 100% pattern

- Test temperature: 100 ~ 200 ℃ (10 ℃ interval)

- Fixing speed: 160mm / sec

- Settling time: 0.08 sec

After the test under the above conditions, the fixability of the fixed image was evaluated as follows.

After the OD of the fixed image was measured, 3M 810 tape was attached to the image area, and the tape was removed after five reciprocations using a 500 g weight. The OD after tape removal is measured.

Fixability (%) = (OD_tape peeling / OD_tape peeling) x100

The fixing temperature region where the fixing property is 90% or more is regarded as the fixing region of the toner.

MFT: Minimum Fusing Temperature [Minimum temperature at which fixability is 90% or more without cold offset]

HOT: HOT Offset Temperature [Minimum temperature at which hot-offset occurs]

Evaluation of Gloss of Toner

The glossiness is measured at 160 캜, which is the temperature at which the fixing device is used, using a gloss meter, which is a gloss meter.

Measuring angle: 60 ^o

Measurement pattern: 100% pattern

Evaluation of high temperature preservability of toner

After 100 g of the toner is extruded, it is put into a developing machine and kept in a packaged state in a constant temperature and humidity oven as follows.

23 ° C, 55% RH (Relative Humidity) 2 hr

=> 40 ° C, 90% RH 48hr

=> 50 ° C, 80% RH 48hr

=> 40 ° C, 90% RH 48hr

=> 23 ° C, 55% RH 6 hr

After the above conditions are stored, whether or not the toner in the developing apparatus is caking is visually observed, and a 100% image is output to evaluate image defects.

- Evaluation standard

○: Good image, no caking (No-Caking)

△: Bad image, no caking

X: Caking occurs

Evaluation of toner fluidity (cohesion) (Carr's Cohesion)

- Equipment: Hosokawa micron powder tester PT-S

- Amount of sample: 2g (external or external toner)

- Amplitude: 1mm_dial 3 ~ 3.5

- Sieve: 53, 45, 38um

- Vibration time: 120sec

After 2 hours of storage at 23 ° C and RH 55%, the amount of change in shear for each size is measured and calculated as follows.

(1) [(mass of particles remaining in the largest size sieve) / 2g] x 100

(2) [(mass of particles remaining in the sheath of the incremental size) / 2g] x 100 x (3/5)

(3) [(mass of particles remaining in the smallest sized sieve) / 2g] x 100 x (1/5)

Carr's Cohesion = (1) + (2) + (3)

- Evaluation Criteria

◎: 10% or less

○: 20% or less

?: 50% or less

X: Greater than 50%

Evaluation of charging property of toner

28.5 g of a carrier (SS82, powder tech) and 1.5 g of a toner are placed in a glass container (60 ml), stirred with a turbula mixer, and then the charge amount of the toner is measured using an electric field separation method.

The charge stability of the toner and the ratio of the high temperature / high humidity / low temperature / low humidity charge (HH / LL) according to the agitation time are used as a measure of the evaluation under normal temperature and humidity conditions.

- Normal temperature and humidity: 23 ℃, RH 55%

- High temperature and high humidity: 32 ℃, RH 80%

- Low temperature and low humidity: 10 ℃, RH 10%

- Evaluation standard

?: 0.59? HH / LL? 0.65

?: 0.45? HH / LL <0.59

X: HH / LL < 0.45

The toner physical properties evaluation results of the above-described Examples 1 to 4 and Comparative Examples 1 and 2 are shown in Table 3 below.

this
brother
My

T _g
[Latex]
[° C] T _g
[toner]
[° C]
δT _g
[° C]
T _m [toner] Temperature
[? = 1 * 10 ⁴
Pa · s]
[° C] ore
Select
Degree Settlement area Daejeon
characteristic U
copper
castle The
On
Bo
zone
castle start
Temperature
[° C] peak
Temperature
[° C] MFT
[° C] HOT
[° C] HH / LL Example 1 P-280 66.6 55.1 11.5 68.2 89.9 106 8.4 140 210 0.65 ○ ○ ○ Example 2 P-318 68.0 59.5 8.5 82.1 86.8 108 8.1 140 210 0.59 ○ ○ ○ Example 3 P-419 67.0 60.1 6.9 88.5 88.1 109 8.8 150 210 0.63 ○ ○ ○ Example 4 P-420 67.0 60.6 6.4 89.1 89.0 111 8.8 150 210 0.62 ○ ○ ○ Comparative Example 1 P-212 66.6 54.1 12.5 68.0 80.4 95 8.9 130 200 0.41 X △ X Comparative Example 2 HNP
-100 67.0 62.5 4.5 80.2 90.8 125 5.8 180 210 0.48 △ ○ ○

*? Tg = latex Tg-toner Tg

In Table 3, δTg indicates the difference between the latex Tg and the toner Tg. The less the miscibility between the releasing agent and the toner is, the less the plasticizer becomes less in the toner. As a result, the Tg of the toner is smaller than the Tg of the latex.

Referring to Table 3, when the ΔTg showing the compatibility tendency between the toner resin and the release agent was 6.4 to 11.5 ° C. as in the case of the toner prepared in Examples 1 to 4, the physical properties of the toner were excellent, In the case of Comparative Example 1 in which the compatibility range δTg is larger than 12.0 ° C., it is confirmed that the charging property is unstable, the preservation property at high temperature is lowered and the degree of coagulation is increased. This is because the compatibility of the releasing agent and toner is excessively increased, It is considered that the possibility of protruding on the surface is large.

Further, in the case of Comparative Example 2 in which? Tg is smaller than 6.4 占 폚, it was confirmed that the agglomeration degree of the toner was small and the high temperature storability was good, but the fixing region was finely decreased.

1 is a schematic diagram of a DSC endothermic curve measured by a differential scanning calorimeter.

2 shows a toner supply means according to an embodiment of the present invention.

FIG. 3 shows an embodiment of an image forming apparatus containing a toner manufactured according to an embodiment of the present invention.

&Lt; Brief Description of Drawings &

100; Toner supply device 101; Toner tank

103; A supply unit 105; The toner-

110; Toner stirring member 112; Rotating shaft

114; A wing plate 120, 130; Toner stirring film

121, 131; First stirring parts 122 and 132; The second agitating part

201: Photoreceptor 202: Charging means

203: light 204: developing device

205: Developing roller 206: Feed roller

207: developer regulating blade 208: developer

208 ': Residual toner 209: Transferring means

210: cleaning blade 212: power source

213: Printing medium

Claims (20)

An electrophotographic toner comprising a latex, a colorant, and a releasing agent, Wherein the toner contains 3 to 1,000 ppm of Si and Fe, Wherein the molar ratio Si / Fe of Si and Fe is 0.1 to 5, The DSC endothermic curve of the toner measured by a differential scanning calorimeter shows that the starting temperature of the maximum endothermic peak curve at the time of heating is 68 to 89 캜 and the peak temperature of the maximum endothermic curve is 86 to 89 캜, The difference between the T _g of the latex and the T _g of the toner is 6.4 to 12.0 ° C, Wherein the releasing agent comprises 100 parts by weight of paraffin wax and 12.5 to 50 parts by weight of ester wax. Toner for electrophotography. delete The method according to claim 1, The electrophotographic toner according to claim 1, wherein the releasing agent comprises an ester group. The method according to claim 1, Wherein the mold release agent is a mixture of a paraffin wax and an ester wax; Or an ester group-containing paraffin wax. delete The method according to claim 1, Wherein the average particle size of the toner is 3 to 8 占 퐉. The method according to claim 1, Wherein the toner has an average circularity of 0.940 to 0.980. The method according to claim 1, Wherein the difference in average circularity of the toners having an average particle size of 2 mu m and 5 mu m is 0.02 or less. The method according to claim 1, Wherein the toner has a GSDv and a GSDp of 1.25 or less. Mixing a primary latex, a colorant dispersion, and a release agent dispersion to prepare a mixture; Adding a flocculant to the mixed liquid to prepare a primary aggregated toner; And A process for producing an electrophotographic toner comprising a step of coating a secondary latex prepared by polymerizing at least one polymerizable monomer onto the primary aggregated toner to prepare a secondary aggregated toner, Wherein the toner contains 3 to 1,000 ppm of Si and Fe, Wherein the molar ratio Si / Fe of Si and Fe is 0.1 to 5, The DSC endothermic curve of the toner measured by a differential scanning calorimeter shows that the starting temperature of the maximum endothermic peak curve at the time of heating is 68 to 89 캜 and the peak temperature of the maximum endothermic curve is 86 to 89 캜, Wherein the first and second difference between T _g of the latex of 6.4 to 12.0 ℃ T _g and the toner, (JP) METHOD FOR PRODUCING ELECTROPHOTOGRAPHIC TONER 11. The method of claim 10, Wherein the primary latex is a polyester alone; A polymer obtained by polymerizing at least one polymerizable monomer; Or a mixture thereof. &Lt; / RTI &gt; 11. The method of claim 10, Further comprising the step of coating a tertiary latex prepared by polymerizing at least one polymerizable monomer onto the secondary coagulation toner. 13. The method according to any one of claims 10 to 12, Wherein the polymerizable monomer is a styrene-based monomer; Acrylic acid, methacrylic acid; (Meth) acrylic acid derivatives; Ethylenically unsaturated monoolefins; Vinyl halide; Vinyl esters; Vinyl ether; Vinyl ketone; And a nitrogen-containing vinyl compound. 11. The method of claim 10, Wherein the releasing agent is a releasing agent containing an ester group. 11. The method of claim 10, Wherein the release agent dispersion is a mixture of a paraffin wax and an ester wax; Or an ester group-containing paraffin-based releasing agent. 11. The method of claim 10, Wherein the releasing agent comprises 100 parts by weight of paraffin wax and 12.5 to 50 parts by weight of ester wax. 11. The method of claim 10, Wherein the coagulant is a metal salt containing Si and Fe. 11. The method of claim 10, Wherein the coagulant comprises polysilica iron. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt; A toner tank in which toner is stored; A supply unit for supplying the stored toner to the outside; And a toner agitating member installed to be rotatable in the toner tank and capable of agitating the toner in the internal space of the toner tank, wherein the toner supply unit comprises: , The toner for electrophotography according to any one of claims 4 to 7, and the toner for electrophotography according to any one of claims 6 to 9. Consultation delay; Image forming means for forming an electrostatic latent image on the surface of the image carrier; Means for containing the toner; Toner supplying means for supplying the toner to the surface of the image carrier to develop the electrostatic latent image on the surface of the image carrier; And toner transferring means for transferring the toner image from the surface of the image carrier to a transferring material, wherein the toner is a toner image of any one of the items Wherein the electrophotographic toner is an electrophotographic toner according to any one of claims 1 to 5.

Images