JP2002278137A - Toner, method for producing the same and image forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for obtaining a high-grade image having a high even gloss even in oilless fixation. SOLUTION: The toner is an electrostatic charge image developing toner containing a crystalline compound of the formula R1 (OCO-R2 )n [where R1 and R2 are each a 1-40C hydrocarbon group which may have a substituent and (n) is an integer of 1-4], a bonding resin and a colorant. In the DSC curve of the toner measured with a differential scanning calorimeter, the toner has >=2 endothermic peaks in the range of 60-110 deg.C, the total quantity of heat absorbed is 4-30 J/g, the temperature difference between the peak at which the quantity of heat absorbed is largest and the peak at which the quantity of heat absorbed is second largest among the endothermic peaks is 2-8 deg.C and the inequality 1<(the quantity S1 of heat absorbed at the highest peak)/(the quantity S2 of heat absorbed at the second highest peak)<is satisfied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner for developing an electrostatic image, a method for producing the same, and an image forming method.

[0002]

In an office color printer or a color copier, an oilless fixing system has been attracting attention because of its advantages such as easy maintenance and writing with a ballpoint pen. I have.

[0003] However, in general, oilless color toners rely on a release agent to produce gloss, and thus have the problem of uneven gloss due to the melting characteristics of the release agent.

Particularly, in a fixing device in which a heating member has an elastic layer, or in a fixing device in which one of a heating member and a pressing member is a belt, a relatively high gloss can be easily obtained because a wide fixing nip can be secured. Although it can be obtained, the temperature distribution in the fixing nip is wide, unevenness in the viscosity of the release agent occurs, gloss unevenness occurs, and the image tends to be poor in quality.

Accordingly, an object of the present invention is to provide a technique capable of obtaining a high-quality image with high gloss and no gloss unevenness even in oilless fixing.

[0006]

An object of the present invention is to provide a toner for developing an electrostatic image containing a crystalline compound represented by the following general formula (I), a binder resin, and a colorant. In the DSC curve measured by the differential scanning calorimeter, the toner has two or more endothermic peaks in the region of 60 to 110 ° C., and the total endothermic amount is 4 to 30 J / g. The temperature difference between the peak having the largest endothermic amount and the second largest peak is 2 to 8 ° C., and 1 <the endothermic amount S ₁ of the largest peak / the endothermic amount S ₂ of the second largest peak <
3 is solved.

A method for producing a toner for developing an electrostatic image, comprising a crystalline compound represented by the following general formula (I), a binder resin, and a colorant, wherein the toner comprises a differential scanning calorimeter In the DSC curve measured with a meter, 60-110 ° C.
Has two or more endothermic peaks in the region, the total amount of the endothermic amount is 4 to 30 J / g, and the temperature difference between the peak having the largest endothermic amount and the second largest peak among the endothermic peaks is 2
A to 8 ° C., by the method for producing a toner, characterized in that the addition of 1 <said maximum peak of the crystalline compound to an endothermic amount S _{1 /} endotherm of the second largest peak S _{2 <3} of Will be resolved.

A latent image forming step of forming a latent image on the latent image carrier, a developing step of visualizing the latent image using toner, and a step of developing the latent image on the latent image carrier. An image forming method comprising: a transfer step of transferring the toner image on a transfer target; and a fixing step of heating and fixing the toner image on the transfer target using a heating member, wherein the toner is the above toner, The problem is solved by an image forming method, wherein the heating member has an elastic layer.

Formula (I) R₁-(OCO-R₂)_n  [However, in the formula, R₁, R₂Each have a substituent
Represents a hydrocarbon group having 1 to 40 carbon atoms, and n is 1
-4. In the above toner, crystallization represented by the general formula (I)
Compound contains only one kind, and two or more kinds
Sometimes. In other words, using one type of crystalline compound
Even when it is used as a toner, crystals of the same compound
Change the state to form peaks with different melting points.
Can be. Stirring strength during miniemulsion polymerization described below
It is also possible to increase the degree.

The content of the crystalline compound may be any as long as it has the above characteristics.
The crystalline compound represented by the general formula (I) is 3 to 40 parts by mass with respect to parts by mass.

The toner of the present invention basically needs to use the crystalline compound of the present invention. However,
Those obtained by dissolving the crystalline substance of the present invention in a polymerizable monomer and polymerizing the same are preferred. Further, those obtained by forming particles in an aqueous medium are preferable. In particular, those obtained by aggregating and fusing resin particles in an aqueous medium are preferable. Above all, those obtained by salting out / fusing composite resin particles containing a crystalline compound and a binder resin and colorant particles are preferable. Alternatively, a resin obtained by fusing resin particles containing a crystalline compound and a binder resin to the surface of colorant particles containing a colorant and a resin by a salting-out / fusion method is preferable.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The toner according to the present invention is a toner for developing an electrostatic image containing a crystalline compound represented by the above general formula (I), a binder resin, and a colorant. In the DSC curve measured by the differential scanning calorimeter, the toner has two or more endothermic peaks in the region of 60 to 110 ° C., and the total endothermic amount is 4 to 30 J / g. The temperature difference between the peak having the largest endothermic amount and the second largest peak is 2 to 8 ° C., and 1 <the endothermic amount S ₁ of the largest peak / the endothermic amount S ₂ of the second largest peak <
3.

The method for producing a toner according to the present invention is a method for producing a toner for developing an electrostatic image, comprising the crystalline compound represented by the general formula (I), a binder resin, and a colorant. The toner has a DS measured by a differential scanning calorimeter.
In the C curve, there are two or more endothermic peaks in the region of 60 to 110 ° C., and the total endothermic amount is 4 to 30 J / g, and the endothermic peak among the endothermic peaks is the second largest and the second largest. a temperature difference is 2 to 8 ° C. with a peak, 1 <adding the crystalline compound to be the outermost of the large peak endotherm S _{1 /} endotherm of the second largest peak S _{2 <3.}

An image forming method according to the present invention comprises a latent image forming step of forming a latent image on a latent image carrier, a developing step of visualizing the latent image using toner, and a latent image carrier. An image forming method comprising: a transfer step of transferring a toner image formed thereon onto a transfer target; and a fixing step of heating and fixing the toner image on the transfer target using a heating member. Is the toner described above, and the heating member has an elastic layer.

In the above toner, there are cases where only one kind of the crystalline compound represented by the general formula (I) is contained and cases where two or more kinds are contained. Even when only one type of crystalline compound is used, when a toner is formed, the crystalline state of the compound having the same composition can be changed to form peaks having different melting points. It is also possible to increase the stirring strength during miniemulsion polymerization described below. The content of the crystalline compound may be any as long as it has the above characteristics, but generally, the crystalline compound represented by the general formula (I) is 3 to 40% by mass relative to 100 parts by mass of the binder resin. Department. The toner of the present invention basically needs to use the crystalline compound of the present invention. However, those obtained by dissolving the crystalline substance of the present invention in a polymerizable monomer and polymerizing the same are preferred. Further, those obtained by forming particles in an aqueous medium are preferable. In particular, those obtained by aggregating and fusing resin particles in an aqueous medium are preferable. Above all, those obtained by salting out / fusing composite resin particles containing a crystalline compound and a binder resin and colorant particles are preferable. Alternatively, a resin obtained by fusing resin particles containing a crystalline compound and a binder resin to the surface of colorant particles containing a colorant and a resin by a salting-out / fusion method is preferable.

In the apparatus used in the image forming method, the heating member has an elastic layer, and the heating member is a belt. Alternatively, the pressing member may be a belt. Either is a belt.

The details will be described below.

[Crystalline compound] The crystalline compound of the present invention is represented by the above general formula (I). Then, DSC measured by a differential scanning calorimeter of the toner containing the crystalline compound
The curve is 60-110 ° C, preferably 70-90 ° C.
Region has two or more endothermic peaks. According to the crystalline compound having a melting point in the range of 60 to 110 ° C., it is possible to lower the overall melt viscosity of the obtained toner, to obtain a high gloss image and to improve the adhesiveness to paper or the like. Can be achieved. In addition, even when the crystalline substance is present, the elastic modulus on the high temperature side is maintained in a preferable range, so that good offset resistance is exhibited. When the melting point of the crystalline substance is lower than 60 ° C., although the fixability itself is improved, the storage stability is reduced, and there is a problem in practicality. On the other hand, when the melting point exceeds 110 ° C., the melting start temperature becomes high, so that the gloss of the image is low and the effect of improving the fixability is reduced. Here, the endothermic peak means a value measured by a differential calorimeter (DSC). Specifically, it refers to the maximum endothermic peak measured when the temperature is raised from 0 ° C. to 200 ° C. at a rate of 10 ° C./min (first temperature increasing process) and the next largest endothermic peak. As a specific measuring device of the melting point, a DSC- manufactured by PerkinElmer Co., Ltd.
7 and the like.

The temperature difference between the peak having the largest amount of heat absorption and the second largest peak among the heat absorption peaks is 2 to 8 ° C. (preferably 2.5 to 5 ° C.). 2 ° C peak temperature difference
If it is smaller, there is no effect of eliminating uneven gloss, and if the peak temperature difference is larger than 8 ° C., high gloss cannot be obtained. In order to make the peak temperature difference 2 to 8 ° C,
A single crystalline compound having such physical properties may be selected in advance, and when forming a toner, the crystalline state of the compound having the same composition is changed so that the peak temperature difference is 2 to 8
° C.

[0020] Also, the heat absorption amount _{S 1} / endotherm _{S 2} of the second largest peak of the maximum peak is greater than 1, and 3
It is smaller. More preferably, the value of the ratio is greater than 1 and less than 2. By limiting in this way, a uniform and high-quality glossy image can be obtained.

In the case where the peaks overlap each other, S ₁ and S ₂ may be obtained by decomposing the peaks into respective peaks, or may be obtained at the valleys of the peaks perpendicularly to the baseline. A line may be drawn and divided, and the area may be determined by the area divided by the dividing line. In the present embodiment, S ₁ / S ₂ was obtained by the latter method.

The half width of the maximum peak is preferably 2 to 7 ° C. The half-width value of the second largest peak is 2 to 7 ° C.
Is preferred. The half width is determined by drawing a line parallel to the base line at a position half the height of the peak with respect to the base line and reading the temperature from the position of the intersection with the DSC curve before and after the peak. In the case where the respective peaks are close to each other and a single half width cannot be obtained without decomposition, the half width of the two peaks is preferably 3 to 10 ° C.

Specific examples of the crystalline compound of the present invention include behenic acid ester of diglycerol, montanic acid ester of diglycerol, behenic acid ester of triglycerol, montanic acid ester of triglycerol, and palmitic acid of dierythritol. And ester compounds such as acid ester, stearic acid ester of dierythritol, arachiic acid ester of dierythritol, montanic acid ester of dierythritol, behenic acid ester of dipentaerythritol, and montanic acid ester of dipentaerythritol.

[Toner Production Method] A known method can be used for the production method of the toner. Specifically, there is a pulverization method in which the constituent materials are mixed, melt-kneaded, and then pulverized and classified through a cooling step to obtain a toner. A polymerization method for obtaining a toner using emulsion polymerization, suspension polymerization, or the like can also be used. In the present invention, a particularly preferable production method is a polymerization method.

In the present invention, a so-called associative toner production method for producing a toner by obtaining resin particles containing an ester compound in a binder resin by a polymerization method and then salting out / fusing the resin particles. It is more preferred to use. The reason for this is not clear, but by using an association-type manufacturing method,
It is presumed that the state of dispersion of the ester compound in the toner particles can be made more uniform.

An example of the production of a toner by the polymerization method will be described below. In this example, a toner is manufactured from the following seven steps. (1) Dissolution step of dissolving an ester compound in a monomer to prepare a monomer solution (2) Dispersion step of dispersing the obtained monomer solution in an aqueous medium (3) The obtained monomer A polymerization step of preparing a dispersion (latex) of resin particles containing an ester compound by polymerizing the aqueous dispersion of the solution. (4) The obtained resin particles and the colorant particles are mixed in an aqueous medium. Salting out / fusion step of obtaining associated particles by salting out / fusing (5) Filtration / washing step of filtering out the obtained associated particles from the aqueous medium and washing away the surfactant and the like from the associated particles. (6) Step of drying the associated particles subjected to washing treatment (7) External addition step of adding an external additive to the associated particles subjected to drying treatment [Dissolution step] The method of dissolving the ester compound in the monomer is not particularly limited. Not something. The amount of the ester compound dissolved in the monomer is such that the content of the ester compound in the finally obtained toner is 0.05 to 50% by mass, preferably 1 to 30% by mass, and more preferably 2-2.
The amount is 0% by mass. Incidentally, an oil-soluble polymerization initiator and other oil-soluble components may be added to the monomer solution.

[Dispersion Step] The method of dispersing the monomer solution in the aqueous medium is not particularly limited, but is preferably a method of dispersing by means of mechanical energy. A method of dispersing the monomer solution into oil droplets using mechanical energy in an aqueous medium in which a surfactant is dissolved (an essential mode in the miniemulsion method) is preferable. Known surfactants can be used.

The disperser for dispersing oil droplets by mechanical energy is not particularly limited.
For example, mechanical homogenizers such as "Clear Mix",
An ultrasonic homogenizer and a pressure homogenizer can be used. In addition, as a dispersion particle diameter, 10 to 1000
nm, more preferably 30 to 300 nm.

[Polymerization Step] In the polymerization step, a conventionally known polymerization method (a granulation polymerization method such as an emulsion polymerization method, a suspension polymerization method, or a seed polymerization method) can be basically used.
An example of a preferable polymerization method is a mini-emulsion method, that is, a monomer solution is dispersed in oil droplets using mechanical energy in an aqueous medium obtained by dissolving a surfactant having a concentration equal to or lower than the critical micelle concentration. A method in which a water-soluble polymerization initiator is added to the obtained dispersion to carry out radical polymerization can be used. [Salt-out / fusion step] In the salt-out / fusion step, a dispersion of colorant particles is added to a dispersion of resin particles obtained by the above polymerization step, and the resin particles and the colorant particles are mixed with each other. Is salted out / fused in an aqueous medium. In the salting-out / fusing step, internal additive particles such as a charge control agent may be fused together with the resin particles and the colorant particles.

The "aqueous medium" in the salting-out / fusion step means a medium whose main component (50% by mass or more) is water. Here, examples of the component other than water include an organic solvent that dissolves in water, such as methanol, ethanol, isopropanol, butanol, acetone, methyl ethyl ketone, and tetrahydrofuran. Of these, alcohol-based organic solvents such as methanol, ethanol, isopropanol, and butanol, which are organic solvents that do not dissolve the resin, are particularly preferable. The colorant particles used in the salting-out / fusion step can be prepared by dispersing the colorant in an aqueous medium. Dispersion treatment of the colorant is carried out by adjusting the surfactant concentration in water to the critical micelle concentration (CM
C) It is performed in the state set above. The dispersing machine used for the colorant dispersion treatment is not particularly limited, but is preferably a mechanical homogenizer such as "CLEARMIX", an ultrasonic homogenizer, a dispersing machine such as a pressure homogenizer, a sand grinder, a Getzman mill, a diamond fine mill, and the like. Media type dispersing machine. Known surfactants can be used. The colorant (particle) may be surface-modified. In the surface modification method of the colorant, the colorant is dispersed in a solvent, the surface modifier is added to the dispersion, and the system is reacted by raising the temperature of the system. After completion of the reaction, the colorant is separated by filtration, washed and filtered repeatedly with the same solvent, and then dried to obtain a colorant (pigment) treated with the surface modifier. In the salting-out / fusion step, a salting-out agent comprising an alkali metal salt and / or an alkaline earth metal salt is added as a coagulant having a critical coagulation concentration or more to water in which resin particles and colorant particles are present. And then
This is a step of performing salting out by heating above the glass transition point of the resin particles and simultaneously performing fusion. In this step, an organic solvent that is infinitely soluble in water may be added.

The alkali metal salts and alkaline earth metal salts which are salting-out agents include lithium, potassium, sodium and the like as alkali metals, and magnesium, calcium, strontium and barium as alkaline earth metals. And preferably potassium, sodium, magnesium, calcium and barium. Examples of the salt include chloride, bromide, iodine, carbonate, sulfate and the like. Examples of the organic solvent infinitely soluble in water include methanol, ethanol,
Examples thereof include 1-propanol, 2-propanol, ethylene glycol, glycerin, and acetone. Among them, alcohols having 3 or less carbon atoms, such as methanol, ethanol, 1-propanol, and 2-propanol, are preferable.
-Propanol is preferred. In the salting-out / fusion step, it is preferable to heat the resin particles to a temperature equal to or higher than the glass transition temperature of the resin particles after adding the salting-out agent. Here, after the dispersion of the resin particles and the colorant particles reaches the temperature equal to or higher than the glass transition temperature, by maintaining the temperature of the dispersion for a certain period of time, the salting-out / fusion is preferably performed. The result is obtained. After stopping the growth of the associated particles, the fusion by heating may be continued. [Filtration / Washing Step] In the filtration / washing step, a process of filtering the toner particles from the dispersion liquid of the toner particles obtained in the above-described process, and an operation of separating the filtered toner particles (cake-like aggregate) from the interface. A cleaning treatment for removing deposits such as an activator and a salting-out agent is performed. Here, examples of the filtration method include a centrifugal separation method, a reduced pressure filtration method using a Nutsche method, a filtration method using a filter press, and the like, but are not particularly limited. [Drying Step] This step is a step of drying the washed toner particles. Examples of the dryer used in this step include a spray dryer, a vacuum freeze dryer, a reduced pressure dryer, and the like, a stationary shelf dryer, a moving shelf dryer, a fluidized bed dryer, a rotary dryer, It is preferable to use a stirring dryer or the like. The moisture content of the dried toner particles is preferably 5% by mass or less, more preferably 2% by mass or less.

If the dried toner particles are agglomerated by weak attraction between the particles, a further crushing treatment may be added. As the crushing device, a mechanical crushing device such as a jet mill, a Henschel mixer, a coffee mill, and a food processor can be used.

[Suspension Polymerization Method] Another example of a method for producing the toner of the present invention is as follows. An ester compound is dissolved in a polymerizable monomer, and a colorant and, if necessary, a release agent. Add various constituent materials such as polymerization initiator, homogenizer,
Various constituent materials are dissolved or dispersed in the polymerizable monomer using a sand mill, a sand grinder, an ultrasonic disperser or the like. The polymerizable monomer in which the various constituent materials are dissolved or dispersed is dispersed in an aqueous medium containing a dispersion stabilizer into oil droplets having a desired size as a toner by using a homomixer or a homogenizer. Thereafter, the stirring mechanism is moved to a reaction device (stirring device), which is a stirring blade described later, and the polymerization reaction is advanced by heating. After completion of the reaction, the toner of the present invention is further prepared by removing the dispersion stabilizer, filtering, washing and drying. Incidentally, the "aqueous medium" in the present invention indicates a medium containing at least 50% by weight of water.

[Pulverization Method] The toner of the present invention can also be produced by a known pulverization method. The raw materials are premixed with a mixer, melt-kneaded, pulverized, and then subjected to airflow classification to prepare the toner of the present invention. The average value of the shape factor of the toner is preferably 0.930 to 0.980. Particularly preferably, it is 0.940 to 0.975. Here, the shape factor is defined by the following equation. Shape factor = (Circumference length of circle obtained from equivalent circle diameter) / (Circumference length of particle projected image) As a simple measurement method of the shape coefficient, it is measured by a particle shape analyzer FPIA-2000 (manufactured by Toa Medical Electronics) I can do it. In controlling the shape factor, for example,
In the salting-out / fusion step, it can be performed by adjusting the temperature and time.

The particle diameter of the toner of the present invention is preferably 3.0 to 9.0 μm in terms of volume average particle diameter. The volume average particle size of these toners can be measured using a Coulter Multisizer. In the Coulter Multisizer, a value measured using an aperture having an aperture diameter of 100 μm and a particle size distribution in a range of 2.0 to 40 μm is shown.

In the toner of the present invention, the amount of fine powder toner of 3.0 μm or less is preferably 20% by number or less in the number distribution, more preferably 10% by number or less of 2.0 μm or less.

[Colorant] As the colorant, a known inorganic or organic colorant can be used.

Specific coloring agents are shown below.

Examples of black colorants include furnace black, channel black, acetylene black,
Carbon black such as thermal black and lamp black, and magnetic powder such as magnetite and ferrite are also used. As a colorant for magenta or red,
C. I. Pigment Red 2, C.I. I. Pigment Red 3, C.I. I. Pigment Red 5, C.I. I. Pigment Red 6, C.I. I. Pigment Red 7, C.I. I. Pigment Red 15, C.I. I. Pigment Red 16,
C. I. Pigment Red 48; 1, C.I. I. Pigment Red 53; 1, C.I. I. Pigment Red 57;
1, C.I. I. Pigment Red 122, C.I. I. Pigment Red 123, C.I. I. Pigment Red 139,
C. I. Pigment red 144, C.I. I. Pigment Red 149, C.I. I. Pigment Red 166, C.I.
I. Pigment Red 177, C.I. I. Pigment Red 178, C.I. I. Pigment Red 222 and the like.

Examples of colorants for orange or yellow include C.I. I. Pigment Orange 31, C.I. I. Pigment Orange 43, C.I. I. Pigment Yellow 1
2, C.I. I. Pigment Yellow 13, C.I. I. Pigment Yellow 14, C.I. I. Pigment Yellow 15,
C. I. Pigment Yellow 17, C.I. I. Pigment Yellow 93, C.I. I. Pigment Yellow 94, C.I.
I. Pigment Yellow 138 and the like.

Examples of the colorant for green or cyan include C.I. I. Pigment Blue 15, C.I. I. Pigment Blue 15; 2, C.I. I. Pigment Blue 15;
3, C.I. I. Pigment Blue 15; 4, C.I. I. Pigment Blue 16, C.I. I. Pigment Blue 60,
C. I. Pigment Blue 62, C.I. I. Pigment Blue 66, C.I. I. Pigment Green 7 and the like. These colorants may be used alone or in combination of two or more as necessary. The colorant is added in an amount of 1 to 30% by mass, preferably 2 to 20% by mass based on the whole toner.
It is better to set it in the range of mass%. [Charge Control Agent] A known charge control agent can be used in the toner of the present invention, if necessary.

Specifically, nigrosine dyes, metal salts of naphthenic acid or higher fatty acids, alkoxylated amines,
Examples thereof include quaternary ammonium salt compounds, azo-based metal complexes, salicylic acid metal salts, and metal complexes thereof. The metals contained are Al, B, Ti, Fe, Co,
Ni and the like. A particularly preferred charge control agent is a metal complex compound of a benzylic acid derivative. The content of the charge control agent is set to 0.1 to 2 with respect to the entire toner.
When the content is 0.0% by mass, a good toner can be obtained.

[External additives] The toner of the present invention has fluidity,
A so-called external additive can be added and used for the purpose of improving the charging property and the cleaning property.
The external additive is not particularly limited, and various inorganic fine particles, organic fine particles, and lubricants can be used. Conventionally known inorganic fine particles can be used. Specifically, silica, titania, alumina, strontium titanate fine particles and the like can be preferably used. These inorganic fine particles may be subjected to a hydrophobic treatment as necessary. Specifically, as silica fine particles, for example, a commercial product R-805 manufactured by Nippon Aerosil Co., Ltd.,
R-976, R-974, R-972, R-812, R
-809, HVK-2150, H-20 manufactured by Hoechst
0, commercial products TS-720, TS-53 manufactured by Cabot Corporation
0, TS-610, H-5, MS-5 and the like.
Examples of the titania fine particles include commercial products T-805 and T-604 manufactured by Nippon Aerosil Co., Ltd., and commercial products M manufactured by Teica Co., Ltd.
T-100S, MT-100B, MT-500BS, M
T-600, MT-600SS, JA-1, commercially available TA-300SI, TA-500, TAF manufactured by Fuji Titanium Co., Ltd.
-130, TAF-510, TAF-510T, commercial products IT-S, IT-OA, IT-OB, I manufactured by Idemitsu Kosan Co., Ltd.
T-OC and the like.

Examples of the alumina fine particles include commercially available products RFY-C and C-604 manufactured by Nippon Aerosil Co., Ltd., and a commercially available product TTO-55 manufactured by Ishihara Sangyo Co., Ltd.

The organic fine particles have a number average primary particle diameter of 1
Spherical organic fine particles of about 0 to 2000 nm can be used. Specifically, a homopolymer such as styrene or methyl methacrylate, or a copolymer thereof can be used.

The amount of the external additive is preferably 0.1 to 10.0% by mass based on the whole toner.

[Lubricant] A lubricant may be added to the toner of the present invention, if necessary, to improve the cleaning property and the transfer property. Examples of the lubricant include salts of zinc, aluminum, copper, magnesium, calcium and the like of stearic acid, salts of zinc, manganese, iron, copper, magnesium and the like of oleic acid, and salts of zinc, copper, magnesium, calcium and the like of palmitic acid. And metal salts of higher fatty acids such as salts of linoleic acid such as zinc and calcium, and salts of ricinoleic acid such as zinc and calcium.

The amount of the lubricant to be added is preferably 0.1 to the entire toner.
It is preferably from 1 to 10.0% by mass.

As a method for adding the lubricant, various known mixing devices such as a Turbula mixer, a Henschel mixer, a Nauter mixer, and a V-type mixer can be used.

[Preparation of Developer] The toner of the present invention may be used as a one-component developer or a two-component developer.

When used as a one-component developer, a non-magnetic one-component developer or a toner containing magnetic particles of about 0.1 to 0.5 μm in a toner to form a magnetic one-component developer can be used. Can also be used.

Further, it can be used as a two-component developer by mixing with a carrier. In this case, conventionally known materials represented by iron-containing magnetic particles such as iron, ferrite, and magnetite can be used as the magnetic particles of the carrier, but ferrite particles or magnetite particles are particularly preferable.

The above magnetic particles have a volume average particle size of 15
１００100 μm, more preferably 20-80 μm. The volume average particle size of the carrier can be measured by a laser diffraction type particle size distribution analyzer “HELOS” (manufactured by SYMPATEC).

The carrier is preferably a coated carrier in which magnetic particles are further coated with a resin, or a so-called resin-dispersed carrier in which magnetic particles are dispersed in a resin.

The resin composition for coating is not particularly limited. For example, an olefin resin, a styrene resin, a styrene-acrylic resin, a silicone resin, an ester resin, a fluorine-containing polymer resin, or the like is used.

The resin for forming the resin-dispersed carrier is not particularly limited, and known resins can be used. For example, styrene-acrylic resins, polyester resins, fluorine resins, phenol resins, etc. are used. it can. The mixing ratio of the carrier and the toner is preferably in the range of carrier: toner = 1: 1 to 50: 1 in mass ratio. [Image Forming Method (Fixing Method)] Next, the image forming method of the present invention will be described. An image forming method according to the present invention includes a latent image forming step of forming a latent image on a latent image carrier, a developing step of developing the latent image using toner, and forming the latent image on the latent image carrier. A transfer step of transferring the toner image onto the transfer object,
Fixing the toner image on the transfer-receiving member by heating using a heating member, wherein the toner is the above-mentioned toner, and the heating member has an elastic layer. According to such an image forming method of the present invention, it is possible to obtain high image quality which is excellent in offset resistance and OHP transparency and free from unpleasant glare.

The elastic layer of the heating member has a function of improving image quality, and is made of a material such as silicone rubber or fluorine-based rubber. The thickness of the elastic layer can be appropriately selected according to the purpose, but is preferably 0.5 to 5.0 mm.

The heating member preferably has a release layer. The release layer is preferably formed of a material having excellent releasability from the toner, for example, silicone rubber or a fluorine-based resin, for the purpose of preventing the toner from adhering. Specific examples of the fluorine-based resin, for example, a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, a copolymer of tetrafluoroethylene and ethylene,
A copolymer of tetrafluoroethylene and hexafluoroethylene is preferably exemplified. The thickness of the release layer,
It can be appropriately selected according to the purpose.
μm is preferred.

At this time, it is effective that the release liquid such as silicone oil applied to the heating member is as small as possible. The releasable liquid is effective for fixing latitude, but because it transfers to the transfer-receiving material to be fixed, there is stickiness, and it is not possible to attach a tape, and it is not possible to add characters with magic, etc. There's a problem. This is remarkable for OHP. In addition, since the release liquid cannot make the roughness of the fixing surface smooth, it also causes a decrease in OHP transparency. In the configuration of the toner of the present invention, a small amount of a releasing liquid such as silicone oil is applied to the fixing roll in order to exhibit a sufficient fixing latitude. For example, A4
The amount may be 1 μl or less per sheet. With the above range, the above-mentioned problems can be substantially avoided. In addition, in the configuration of the toner of the present invention, since a sufficient fixing latitude is exhibited without applying a releasing liquid, the releasing liquid applying mechanism can be omitted to save space.

When the heating member is constituted by two rolls, the surface of the roll which is in contact with the toner image on the transfer object may be more concave than the surface of the other roll to form a nip. This is preferable because the transfer-receiving body is hardly wound around the roll. For example, if the thickness of the elastic layer of the roll that contacts the toner image on the
mm, the thickness of the elastic layer on the other roll is 1 mm
Or the hardness of the elastic layer with the same thickness can be achieved by setting a lower roll in contact with the toner image on the transfer-receiving member and applying a load. With this configuration, the discharge direction of the transfer target body immediately after passing through the fixing roll is a direction away from the roll that comes into contact with the toner image on the transfer target body, and winding is unlikely to occur.

From the viewpoint of power consumption, it is preferable that the heating member is composed of one roll and a belt, and that the roll is in contact with the toner image on the transfer object because the heat capacity of the belt is small. The material of the belt is preferably a heat-resistant material such as tetrafluoroethylene or polyimide. The layer thickness of the belt is preferably 2 mm or less, and the surface is preferably coated with a fluorine resin equivalent to the heating member. In addition, by applying pressure from the inside of the belt to a roll in contact with the toner image on the transfer object from the inside of the belt with a pressure roll or the like to form a recess, the discharge direction of the transfer object immediately after passing through the fixing roll can be changed. This is a direction away from the roll that is in contact with the toner image on the transfer member, and is preferable because winding is less likely to occur.

The surface temperature of the heating member is preferably 30 ° C. or higher, more preferably 50 ° C. or higher, than the temperature at the DSC endothermic peak of the wax contained in the toner of the present invention. If the surface temperature is not higher than the DSC endothermic peak temperature of the wax by 30 ° C. or more, the wax may not be able to sufficiently exhibit the releasing effect.

When a contact type such as a thermocouple is used as the temperature control sensor of the heating member, the surface of the heating member is easily worn in the structure of the present invention, unlike the conventional type in which a large amount of a releasing liquid is applied. Therefore, if the position of the temperature control sensor is present in the image area, an image quality defect will occur. The non-image portion includes not only a portion through which the sheet does not pass but also an end portion where the toner is not transferred onto the sheet.

Hereinafter, a specific example will be described.

[0065]

[Latex 1HML]

(1) Preparation of core particles (first stage polymerization): 5000 m equipped with a stirrer, a temperature sensor, a cooling pipe, and a nitrogen introducing device
In a separate separable flask, an anionic surfactant (101) C ₁₀ H ₂₁ (OCH ₂ CH ₂ ) ₂ OSO ₄ N
a A surfactant solution (aqueous medium) prepared by dissolving 7.08 g of ion-exchanged water in 3010 g of ion-exchanged water was charged under a nitrogen stream at 230.
While stirring at a stirring speed of rpm, the internal temperature was raised to 80 ° C.

To this surfactant solution was added 9.2 g of a polymerization initiator (potassium persulfate: KPS) in 200 g of ion-exchanged water.
Was added, and the temperature was adjusted to 75 ° C., and then 70.1 g of styrene and n-butyl acrylate 1 were added.
A monomer mixture composed of 9.9 g and 10.9 g of methacrylic acid was added dropwise over 1 hour, and the system was heated and stirred at 75 ° C. for 2 hours to perform polymerization (first-stage polymerization). Latex (a dispersion of resin particles composed of a high molecular weight resin) was prepared. This is designated as “latex (1H)”. (2) Formation of intermediate layer (second stage polymerization): In a flask equipped with a stirrer, 105.6 g of styrene, n-
30.0 g of butyl acrylate, 6.2 methacrylic acid
g, to a monomer mixture consisting of 5.6 g of n-octyl-3-mercaptopropionate, 70.9 g of pentaeristol tetrabehenate and 41.6 g of pentaeristol tetralignocerinate were added, and 88 The mixture was heated to ℃ and dissolved to prepare a monomer solution.

On the other hand, an anionic surfactant (formula 10)
1) A surfactant solution prepared by dissolving 1.6 g in 2700 ml of ion-exchanged water was heated to 78 ° C., and 28 g of the latex (1H) as a dispersion of core particles was added to the surfactant solution in terms of solid content. After the addition, the following compound was added using a mechanical disperser “CLEARMIX” (manufactured by M Technic Co., Ltd.) having a circulation route. Was mixed and dispersed for 4 hours, and the dispersed particle size (84
A dispersion liquid (emulsion liquid) containing emulsified particles (oil droplets) having the following formula:

Next, to this dispersion liquid (emulsion liquid) were added an initiator solution obtained by dissolving 5.1 g of a polymerization initiator (KPS) in 240 ml of ion-exchanged water, and 750 ml of ion-exchanged water. Polymerization (second-stage polymerization) is carried out by heating and stirring at 0.5 ° C. for 0.5 hour, and a dispersion of latex (a composite resin particle having a structure in which the surface of a resin particle composed of a high molecular weight resin is coated with an intermediate molecular weight resin) ) Got. This is referred to as “latex (1HM)”. (3) Formation of outer layer (third stage polymerization): A polymerization initiator (KPS) is added to the latex (1HM) obtained as described above.
An initiator solution in which 7.4 g was dissolved in 200 ml of ion-exchanged water was added, and styrene 300 was dissolved under a temperature condition of 80 ° C.
g, n-butyl acrylate 95 g, methacrylic acid 1
A monomer mixture composed of 5.3 g and 10.4 g of n-octyl-3-mercaptopropionate was added dropwise over 1 hour. After completion of the dropping, polymerization (third stage polymerization) is carried out by heating and stirring for 2 hours, then cooled to 28 ° C., and a latex (a central portion made of a high molecular weight resin,
A dispersion of composite resin particles having an intermediate layer made of an intermediate molecular weight resin and an outer layer made of a low molecular weight resin, wherein the intermediate layer contains the compound of the above structural formula) was obtained. This latex is referred to as “latex 1HML”.

The composite resin particles constituting the latex 1HML were 138,000, 80,000 and 13.0
The composite resin particles had a peak molecular weight of 00, and the weight average particle size of the composite resin particles was 104 nm.

[Latex 2HML] Latex 1HM
In the synthesis of L, pentaerythritol tetrabehenate was replaced with 75.8 g of pentaerythritol tristearate, 125.8 g, and pentaeristol tetralignocerinate, 41.6 g, instead of pentaerythritol tetranonadecanate. A latex (having a central portion composed of a high-molecular-weight resin, an intermediate layer composed of an intermediate-molecular-weight resin, and an outer layer composed of a low-molecular-weight resin, except that the crystalline material is contained in the intermediate layer. (A dispersion of composite resin particles). This latex is referred to as “latex 2HML”. The composite resin particles constituting the latex 2HML are 138,000, 80,00
It has a peak molecular weight at 0 and 12,000, and the weight average particle diameter of the composite resin particles is 101 nm.
Met. [Latex 3HML] In the synthesis of latex 1HML, 70.9 g of pentaeristol tetrabehenate
Instead of Penta Eristol Tetramontanate 8
Latex (from a central portion composed of a high molecular weight resin and an intermediate molecular weight resin, except that 3.2 g and 130.2 g of pentaeristol tetralacnoserate instead of 41.6 g of pentaeristol tetralignocerinate) were used. Intermediate layer, and an outer layer made of a low molecular weight resin,
A dispersion of composite resin particles containing a crystalline substance in the intermediate layer) was obtained. This latex is referred to as “Latex 3H
ML ". The composite resin particles constituting the latex 3HML are 138,000, 80,000 and 12,
The composite resin particles had a peak molecular weight of 000, and the weight average particle size of the composite resin particles was 102 nm.

[Comparative Latex 1HML] In the synthesis of latex 1HML, the procedure was the same except that pentaerythritol tetrabehenate was used in an amount of 112.5 g, and pentaeristol tetralignocerinate was not used.
Latex (dispersion liquid of composite resin particles having a central portion composed of a high molecular weight resin, an intermediate layer composed of an intermediate molecular weight resin, and an outer layer composed of a low molecular weight resin, wherein the intermediate layer contains a crystalline substance) I got This latex is referred to as “comparison latex 1HML”. This comparative latex 1
Composite resin particles constituting HML are 134,000, 7
It has peak molecular weights at 9,000 and 14,000, and the composite resin particles have a weight average particle size of 10
It was 2 nm.

[Comparative latex 2HML] In the synthesis of latex 1HML, a latex (comprising a high molecular weight resin) was prepared in the same manner except that 90.0 g of pentaeristol tetrabehenate and 22 g of pentaeristol tetralignocerinate were used. A dispersion liquid of composite resin particles having a central portion, an intermediate layer made of an intermediate molecular weight resin, and an outer layer made of a low molecular weight resin, wherein the intermediate layer contains a crystalline substance was obtained. This latex is referred to as “comparison latex 2HML”. This comparative latex 2HM
The composite resin particles constituting L are 142,000, 79,
000 and 13,500, and the composite resin particles have a weight average particle size of 112 n.
m.

[Comparative Latex 3HML] In the synthesis of latex 1HML, instead of 70.9 g of pentaeristol tetrabehenate, 61.9 g of pentaeristol tetrastearate and 41.6 g of pentaeristol tetralignocerinate were used. In the same manner except that 50.6 g of pentaeristol tetrapalmitinate was used, a latex (a central portion composed of a high molecular weight resin,
A dispersion of composite resin particles having an intermediate layer made of an intermediate molecular weight resin and an outer layer made of a low molecular weight resin, wherein the intermediate layer contains a crystalline substance was obtained. This latex is referred to as “comparison latex 3HML”. The composite resin particles composing the comparative latex 3HML are 161,0
It had peak molecular weights at 00, 77,000 and 15,000, and the composite resin particles had a weight average particle size of 116 nm.

[Production of Toner 1] 59.0 g of the above-mentioned anionic surfactant (101) was stirred and dissolved in 1600 ml of ion-exchanged water. While stirring this solution, C.I. I. Pigment Red 122 is gradually added, and then dispersed using "CLEARMIX" (manufactured by M Technique Co., Ltd.) to obtain a dispersion of colorant particles (hereinafter referred to as "colorant dispersion"). ) Was prepared. The particle size of the colorant particles in the colorant dispersion,
When measured using an electrophoretic light scattering photometer “ELS-800” (manufactured by Otsuka Electronics Co., Ltd.), the weight average particle diameter was 88 n.
m.

Latex 1HML 420.7 g (in terms of solid content), ion-exchanged water 900 g, colorant dispersion 16
6 g was placed in a reaction vessel (four-necked flask) equipped with a temperature sensor, a cooling tube, a nitrogen introducing device, and a stirring device and stirred. After adjusting the internal temperature to 30 ° C., a 5N aqueous sodium hydroxide solution was added to the solution to adjust the pH to 8.0.

Next, magnesium chloride hexahydrate12.
An aqueous solution obtained by dissolving 1 g in 1000 ml of ion-exchanged water,
The solution was added at 30 ° C. over 10 minutes with stirring. After standing for 3 minutes, the temperature was raised, and the system was heated to 79
The temperature was raised to ° C. In this state, the particle size of the associated particles was measured with a “Coulter counter TA-II”, and when the number average particle size became 4 μm, 80.4 g of sodium chloride was obtained.
Was added to an aqueous solution of 1000 ml of ion-exchanged water to stop the particle growth.
The fusion was continued by heating and stirring at 1 ° C. for 1 hour. Thereafter, the mixture was cooled to 25 ° C. under the condition of 3 ° C./min, the pH was adjusted to 2.0 by adding hydrochloric acid, and the stirring was stopped. The produced associated particles were filtered, washed repeatedly with ion-exchanged water at 45 ° C, and then dried with warm air at 40 ° C to obtain magenta colored particles 1.

Then, the 100 obtained as described above is obtained.
1 part by mass of the colored particles 1 were treated with 1.0 part by mass of hydrophobic acicular titanium (hydrophobized with normal butyltrimethoxysilane), and 0.8 part by mass of silica (produced by the deflagration method, hexamethylsilazane). And the peripheral speed of the rotor of the 10 L Henschel mixer is increased to 30 m.
/ S and mixed to produce Toner 1 (Example 1).

Table 1 shows the properties of the toner obtained as described above.

Table 1 [Production of Toner 2] In the production of Toner 1, latex 2HML was used in place of latex 1HML.
I. Pigment Red 122 instead of C.I. I. A yellow toner 2 (Example 2) was obtained in the same manner except that Solvent Yellow 93 was used.

[Production of Toner 3] In the production of Toner 1, latex 3HML was used instead of latex 1HML.
And C.I. I. Pigment Red 122 instead of C.I. I. Pigment Blue 15 was used, and a cyan toner 3 (Example 3) was obtained in the same manner.

[Production of Comparative Toner 1] A magenta comparative toner 1 (Comparative Example 1) was obtained in the same manner as in the production of Toner 1, except that Comparative Latex 1HML was used instead of Latex 1HML. .

[Production of Comparative Toner 2] A magenta comparative toner 2 (Comparative Example 2) was obtained in the same manner as in the production of Toner 1, except that Comparative Latex 2HML was used instead of Latex 1HML. .

[Production of Comparative Toner 3] A magenta comparative toner 3 (Comparative Example 3) was obtained in the same manner as in the production of Toner 1, except that Comparative Latex 3 was used instead of Latex 1 HML. .

[Production of Photosensitive Member] The following coating solution was applied onto a cylindrical conductive support to prepare a photosensitive member.

<Undercoat layer> Titanium chelate compound (TC-750, manufactured by Matsumoto Pharmaceutical) 30 g Silane coupling agent (KBM-503, manufactured by Shin-Etsu Chemical Co., Ltd.) 17 g 2-propanol 150 ml Cylindrical conductive support using the above coating solution On top, a film thickness of 0.
It was applied to a thickness of 5 μm.

<Charge Generating Layer> Y-type titanyl phthalocyanine (a titanyl phthalocyanine having a maximum peak at 27.2 degrees at a Bragg angle 2θ (± 0.2) of 27.0 degrees in Cu-Kα characteristic X-ray diffraction spectrum measurement) 60 g silicone-modified butyral Resin (X-40-1211M: manufactured by Shin-Etsu Chemical Co., Ltd.) 700 g 2-butanone 2000 ml The above composition was mixed and dispersed using a sand mill for 10 hours to prepare a charge generation layer coating solution. This coating solution was applied on the undercoat layer by a dip coating method to form a 0.2 μm-thick charge generation layer.

<Charge Transport Layer> Charge transport material N- (4-methylphenyl) -N- {4- (β-phenylstyryl) phenyl} -p-toluidine 225 g Polycarbonate (viscosity average molecular weight 30,000) 300 g Antioxidant 6g 2000 ml of dichloromethane The above composition was mixed and dissolved to prepare a coating solution for the charge transport layer. This coating solution was applied on the charge generation layer by a dip coating method to form a charge transport layer having a dry film thickness of 20 μm.

<Protective Layer> Methyltrimethoxysilane 150 g Dimethyldimethoxysilane 30 g The following reactive charge transporting compound 15 g The following antioxidant 0.75g 2-propanol 75 g 3% acetic acid 5 g The above composition was mixed to prepare a coating solution for a resin layer. A 2 μm-thick resin layer was formed on the charge transport layer by a circular amount-regulating coating device on the charge transport layer, and was heated and cured at 120 ° C. for 1 hour to form a siloxane resin layer, thereby producing a photoreceptor. did.

Then, Konica's digital copier Koni
An image was formed by the apparatus shown in FIG.

As the developing unit, a toner conveying member composed of a 25 mm silicone rubber roller was used, and the diameter of the toner replenishment auxiliary member was set to 20 mm. or,
A member made of urethane rubber was used as the toner layer regulating member, and the contact pressure was 0.6 N / cm. The copying speed was changed to A4, 20 sheets / min (ppm), and the actual copying was evaluated. Further, a method of cleaning the untransferred toner remaining on the photoreceptor by a blade cleaning method is employed. The fixing method uses the apparatus shown in FIG.
70 ° C. The image forming conditions were such that a line drawing having a pixel ratio of 5% was used in a high-temperature and high-humidity environment (30 ° C., 85% RH), and 50,000 sheets were printed by a one-sheet intermittent printing method.

In FIG. 1, 11 is a photoreceptor, 12 is a developing roll, 13 is a toner regulating plate, 14 is a toner carrying roll,
Reference numeral 15 denotes a toner stirring blade, 16 denotes toner, 17 denotes a developing device housing (bottom plate). In FIG. 2, 40 denotes a heating roller, 41 denotes a cored bar, 42 denotes an elastic layer (such as silicon rubber),
3 is a release layer (PFA tube etc.), 44 is a heater, 4
5 is a temperature sensor, 50 is an endless belt, 51 is a pressure roller, 52 and 53 are support rollers, 54 is a base plate, 55 is a pressure auxiliary pad, and 56 is a pressure pad.

<Standard glossiness> The standard glossiness is measured by a gloss meter VGS-1D (manufactured by Nippon Denshoku Industries Co., Ltd.) at an incident angle of 75 ° in an image portion where the recording material is covered by 90% or more of the toner. Was measured by Standard glossiness is 1
If it is 7 to 37, the photographic image has a three-dimensional effect due to appropriate gloss, and characters are easy to read.

：: Standard glossiness 25 to 37 ○: Standard glossiness 17 to 25 ×: Less than standard glossiness 17 <Glossy unevenness> The gloss unevenness was visually evaluated.

：: excellent ○: good ×: failed <Transparency of OHP image> Transparency: The transparency of the OHP image was evaluated by the following method.

A transmission image (OHP image) was prepared and evaluated by the following method. Incidentally, the toner adhesion amount is 0.7 ± 0.
The evaluation was performed in the range of 05 (mg / cm ² ).

With respect to the fixed image, the visible spectral transmittance of the image was measured using a “330-type self-recording spectrophotometer” manufactured by Hitachi, Ltd. with reference to an OHP sheet carrying no toner.
Difference in spectral transmittance at 50 nm, 65 for magenta toner
The difference between the spectral transmittance at 0 nm and 550 nm, and the difference between the spectral transmittance at 500 nm and 600 nm for the cyan toner were determined, and used as a measure of the transparency of the OHP image. This value is 70%
In the case where the above is satisfied, it can be determined that the transmittance is good.

◎: 90% or more ：: 70 to 90% ×: less than 70% <Offset resistance> After continuous printing of 1,000 sheets on A4 size transfer paper, white paper was printed, and the smear of white characters due to offset was evaluated. did.

The transfer paper used was 200 g of high quality paper /
Using the cardboard m ^2, the paper traveling direction (heat roller circumferential direction)
, A line image having a width of 0.3 mm and a length of 150 mm was formed. Paper stains and toner stains on the surface of the heat roller were visually observed.

A: Image offset and toner stain on the heat roller are not observed at all. O: Image offset is not confirmed, but toner stain is observed on the heating roller. X: Image offset is confirmed. ○ means pass, × means fail. Table 2 shows the evaluation results.

Table 2 Standard Gloss Gloss Unevenness OHP Transmission Offset Resistance Example 1 ◎ ◎ ◎ ◎ Example 2 ◎ ◎ ◎ ◎ Example 3 ◎ ◎ ◎ ◎ Comparative Example 1 ○ × × ○ Comparative Example 2 ○ × × ○ Comparative Example 3 × × × ×

The luster is high even in oilless fixing.
A high quality image without gloss unevenness can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a main part of a digital copying machine.

FIG. 2 is a schematic diagram of a fixing device.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tatsuya Nagase 2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica Stock Company In-house F-term (reference) 2H005 AA08 AB02 AB06 CA14 CA30 EA03 EA07 2H033 AA01 BA11 BA12 BA58 BB15

Claims (18)

[Claims] 1. Crystallization represented by the following general formula (I)
Compound, binder resin, and for developing electrostatic image containing colorant
A toner, which has a DSC curve measured by a differential scanning calorimeter of 60%.
There are two or more endothermic peaks in the
The total amount of heat is 4 to 30 J / g, and the endothermic peak is
Between the largest peak and the second largest peak
The temperature difference is 2 to 8 ° C., and 1 <the endothermic amount S of the maximum peak
₁/ Endotherm S of the second largest peak₂<3
And a toner characterized in that: General formula (I) R₁-(OCO-R₂)_n  [However, in the formula, R₁, R₂Each have a substituent
Represents a hydrocarbon group having 1 to 40 carbon atoms, and n is 1
-4. ] 2. The toner according to claim 1, wherein the toner contains only one kind of the crystalline compound represented by the general formula (I). 3. The toner according to claim 1, wherein the toner contains two or more types of the crystalline compounds represented by the general formula (I). 4. The toner according to claim 1, wherein the content of the crystalline compound represented by the general formula (I) is 3 to 40 parts by mass with respect to 100 parts by mass of the binder resin. 5. The toner according to claim 1, wherein the toner is obtained by dissolving a crystalline substance in a polymerizable monomer and polymerizing the same. 6. The toner according to claim 1, wherein the toner is obtained by forming particles in an aqueous medium. 7. The toner according to claim 1, wherein the toner is obtained by coagulating and fusing resin particles in an aqueous medium. 8. The toner according to claim 1, wherein the toner particles are obtained by salting out / fusing resin particles containing a crystalline compound and a binder resin and colorant particles. 7 Any toner. 9. The toner is characterized in that resin particles containing a crystalline compound and a binder resin are fused to the surface of colorant particles containing a colorant and a resin by a salting out / fusion method. The toner according to claim 1, wherein 10. Crystallinity represented by the following general formula (I)
Electrostatic image development containing compound, binder resin, and colorant
A method for producing a toner for use in a computer, the toner comprising a DSC curve measured by a differential scanning calorimeter.
, Two or more endothermic peaks in the range of 60 to 110 ° C
And the total amount of heat absorption is 4-30 J / g.
Endotherm of heat peak is the largest and second largest
Temperature difference from the peak is 2 to 8 ° C., and 1 <the maximum peak
Heat absorption S₁/ Endotherm S of the second largest peak₂
<3 is characterized in that the crystalline compound is added so as to satisfy 3.
A method for producing a toner. General formula (I) R₁-(OCO-R₂)_n  [However, in the formula, R₁, R₂Each have a substituent
Represents a hydrocarbon group having 1 to 40 carbon atoms, and n is 1
-4. ] 11. The method for producing a toner according to claim 10, wherein the crystalline compound represented by the general formula (I) is used in an amount of 3 to 40 parts by mass with respect to 100 parts by mass of the binder resin. 12. A crystalline substance dissolved in a polymerizable monomer,
The method for producing a toner according to claim 10, wherein the toner is obtained by polymerization. 13. The method for producing a toner according to claim 10, wherein the toner is obtained by forming particles in an aqueous medium. 14. The method for producing a toner according to claim 10, wherein the toner is obtained by aggregating and fusing the resin particles in an aqueous medium. 15. The toner according to claim 10, wherein the toner is obtained by salting out / fusing the resin particles containing the crystalline compound and the binder resin and the colorant particles. Manufacturing method. 16. A toner obtained by fusing resin particles containing a crystalline compound and a binder resin to the surface of colorant particles containing a colorant and a resin by a salting out / fusion method. A method for producing a toner according to any one of claims 10 to 15. 17. A latent image forming step of forming a latent image on a latent image carrier, a developing step of developing the latent image using toner, and a step of forming a toner image on the latent image carrier. An image forming method, comprising: a transfer step of transferring a toner image on a transfer target; and a fixing step of heating and fixing the toner image on the transfer target using a heating member, wherein the toner is used. 9. The image forming method according to claim 9, wherein the heating member has an elastic layer. 18. The image forming method according to claim 17, wherein the heating member is a belt.