JP4020395B2 - Electrostatic latent image developing toner, magnetic one-component electrostatic latent image developing toner, and magnetic ink character recognition toner - Google Patents

Description

  The present invention relates to a toner for developing an electrostatic latent image, a magnetic one-component electrostatic latent image used in a developing process such as electrophotography, electrostatic recording method, electrostatic printing method and the like employed in copying machines, laser printers, and the like. The present invention relates to a developing toner and a magnetic ink character recognition toner.

  In dry electrophotography, the toner used to make an electrostatic latent image formed on a photoreceptor visible is generally a thermoplastic resin (binder resin), a charge control agent, a magnetic powder, and others. These additives are premixed and then subjected to melt-kneading, pulverization, and classification steps to produce a toner having a desired particle size. In the toner particles, a certain amount of positive or negative charge is accumulated by frictional charging on the particle surface, and the charged particles are used for developing an electrostatic latent image.

  Here, the charge accumulated on the surface of the toner particles due to frictional charging needs to be either positive or negative depending on the type of the photoconductive photoreceptor used for forming the electrostatic latent image. In this case, the amount of charge needs to be sufficient to make the electrostatic latent image visible more accurately. For this reason, it is common to mix and disperse a charge control agent or conductive material in a binder resin to control the charge and charge amount on the surface of the toner particles. Inorganic materials such as silica, aluminum oxide, titanium oxide, and zinc oxide are used. A fine powder is added.

  Various methods and apparatuses have been developed for fixing a toner image obtained by visualizing an electrostatic latent image onto a sheet such as paper. For example, there are a heat-pressure roller system using a heat roller, and a heat-fixing method in which a heating member is pressed and fixed by a pressure member through a film.

  In the system using a heat roller, fixing is performed by a heat roller having a surface formed of a material having releasability with respect to toner. In this method, the surface of the heat roller and the toner image on the recording paper come into contact with each other, so that the thermal efficiency when fusing the toner image on the recording paper is extremely good, the fixing can be performed quickly, and it is very effective. is there. However, in the above method, since the heat roller and the toner image are in contact with each other in a molten state, a part of the toner image adheres to and is transferred to the fixing roller, and this is transferred again to the next recording paper, thereby causing a so-called offset phenomenon. The recording paper may be contaminated. As an essential condition of the heat roller fixing method, it is necessary to prevent such an offset phenomenon from occurring.

  Conventionally, for the purpose of preventing toner from adhering to the surface of the heat roller for fixing, for example, the surface of the heat roller is formed of a material excellent in releasability with respect to the toner, such as silicon rubber or fluorine resin, and the surface is prevented from being offset In order to prevent the roller surface from being fatigued, the roller surface is coated with a thin film of liquid having good releasability such as silicon oil. However, such a method is extremely effective in preventing toner offset, but has a problem that the fixing device becomes complicated because a device for supplying a release agent for preventing offset is necessary. Yes. Therefore, an attempt has been actively made to improve with toner instead of using a supply device for a release agent for preventing offset.

On the other hand, in recent years, printers and copiers using an electrophotographic system have been required to have low power consumption due to demands for energy saving. Among the dry electrophotographic processes of printers and copiers, the fixing process consumes the most power. For this reason, in order to achieve the above-mentioned energy saving, it is necessary to improve and improve the fixing process, which is one of the most important factors. That is, it is necessary to fix the toner image on the recording paper with less power, in other words, less power consumption and less heat. The fixability of the toner tends to decrease as the linear velocity of the fixing roller increases, and this is particularly remarkable when the linear velocity exceeds 100 mm / second.
In addition, in a magnetic one-component toner in which a magnetic material is added in order to give magnetism to the toner, 35 to 60% by mass of magnetic powder is added to the toner, so that the fixability is worse than that of a conventional toner. There is a problem of becoming.

  In response to the above requirements, proposals have been made to improve the molecular weight and molecular weight distribution of the binder resin contained in the toner. Specifically, attempts have been made to lower the fixing temperature by lowering the molecular weight of the binder resin. However, although the melting point is lowered by lowering the molecular weight, the melt viscosity is also lowered at the same time, which causes a problem that an offset phenomenon to the hot roller occurs. In order to prevent this offset phenomenon, a method of widening a low molecular region and a high molecular region in the molecular weight distribution of the binder resin, or partially cross-linking a part of the high molecular region has been performed. However, in this method, the glass transition temperature of the resin has to be lowered in order to sufficiently impart the fixing property, and it is inevitable that the toner blocking property is deteriorated. Further, if the low molecular weight portion of the binder resin is increased, the toner itself becomes fragile, and there is a possibility that a defect will occur if the recording paper after fixing is rubbed.

  Furthermore, it is known that polyalkylenes are contained as a releasing agent in the toner. In Patent Document 1 and Patent Document 2, etc., a styrene resin contains a monopolymer wax such as low molecular weight polyethylene and low molecular weight polypropylene, and in Patent Document 3, a styrene resin also contains a low molecular weight olefin copolymer. Is disclosed.

  However, the conventional offset prevention methods as described above have drawbacks such as causing image defects such as fogging due to deterioration of the charging characteristics of the toner, and causing a decrease in image density. Furthermore, the fixing property in a low temperature region is insufficient, and the problem of smearing the back surface of the paper (smear resistance) occurs.

  On the other hand, in recent years, identification marks called fonts are used in checks, securities, bills, tickets, and the like for the purpose of preventing these counterfeits and alterations. This forgery prevention method using the identification mark is generally called a MICR (Magnetic Ink Character Recognition) system, and is disclosed in, for example, Patent Document 4, Patent Document 5, and Patent Document 6 below. Yes.

  Specifically, the identification mark made of the font is configured by combining numbers and symbols, and the function can be exhibited by printing on the surface of a check or the like for preventing forgery. In other words, the identification mark is composed of magnetic ink in which a certain amount of magnetic powder is mixed in a binder resin, and the font that is the identification mark is read with a dedicated reader using the magnetic force of the magnetic powder. The authenticity of a check or the like can be accurately determined from the read information. In addition, since the identification mark made of such a font can be roughly recognized by human eyes, unlike a barcode or the like, it is possible to make a simple and quick true / false judgment before making a decision with a dedicated reader. It also has the advantage.

  Here, when printing the magnetic ink constituting the font, a screen printing method or a gravure printing method can be adopted, but in recent years, a method of printing magnetic ink using a printer as a quick and simple method has attracted attention. Yes. When magnetic ink is printed using a printer, the magnetic ink is called MICR toner or MICR printer magnetic toner. The MICR toner generally includes a binder resin made of a thermoplastic resin, a wax as a release agent, a magnetic powder, an inorganic powder, and the like after being uniformly kneaded, followed by a pulverization and classification process, silica, and an abrasive. MICR toner having an average particle diameter adjusted to about 4 to 15 μm is finally used. However, since the conventional MICR toner requires residual magnetization necessary for reading, the charge amount distribution becomes broad as printing is performed, resulting in a decrease in image density and occurrence of fogging. There are problems such as many reading errors due to contamination of the head.

Therefore, in Patent Document 7, Patent Document 8, and Patent Document 9 below, the residual magnetization of the magnetic powder in the toner for MICR containing the binder resin (polyolefin resin) and the magnetic powder is 7.0-24. Two kinds of magnetic powders having a value within the range of 0 emu / g and different residual magnetization values are mixed and dispersed in the binder resin, and the residual magnetization in the obtained MICR toner is set to 4.0 to 7.0 emu / g. A toner for MICR limited to a value in the range of g is disclosed. However, the residual magnetization of the MICR toner cannot be increased by simply combining the two kinds of magnetic powders, and the residual magnetization of the MICR toner is in the range of 4.0 to 7.0 emu / g. When limited to values, there were actually problems such as low image density and many reading errors.
Japanese Patent Publication No.57-52574 Japanese Patent Publication No.52-3304 Japanese Patent Laid-Open No. 50-93647 JP-A-2-134648 Japanese Patent Laid-Open No. 5-80582 US Pat. No. 5,034,298 JP-A-4-358164 JP-A-4-358165 JP 7-77829 A

  An object of the present invention is to provide a toner for developing an electrostatic latent image that can be fixed at a low temperature even when the linear speed of the fixing roller exceeds 100 mm / second, has improved smearing properties, and does not cause an offset phenomenon. To provide a toner for developing a magnetic one-component electrostatic latent image.

  Another object of the present invention is that even if the linear velocity of the fixing roller exceeds 100 mm / second, fixing can be performed at a low temperature, smearing properties are improved, offset phenomenon does not occur, and the MICR read head becomes dirty. It is an object of the present invention to provide a magnetic ink character recognizing toner that suppresses ink.

The toner of the present invention for solving the above problems has the following configuration.
(1) An electrostatic latent image developing toner containing a binder resin, a wax, a charge control agent and a colorant, comprising a polystyrene resin as the binder resin and further penetrating at 25 ° C. as the wax. A first wax component having a degree of 1 dmm or less and a second wax component having a penetration of 5 to 20 dmm, and a melting point by differential scanning calorimetry of the first wax component and the second wax component There Ri 70 to 140 ° C. der respectively, further wherein the first wax component temperature is 85 to 105 ° C. showing a melt viscosity 1 × 10 ⁴ Pa · s, the second wax component is a melt viscosity 1 × 10 ⁴ Pa · s temperature showing a is 55 to 75 ° C., the toner is an electrostatic latent image developing toner of temperature showing a melting viscosity 1 × 10 ⁴ Pa · s is characterized 110-130 ° C. der Rukoto.
(2) One or both of the first and second wax components are Fischer-Tropsch waxes produced by a Fischer-Tropsch method, and both the first and second wax components are Fischer-Tropsch waxes. If the first wax component has a melting point of 90 to 120 ° C. by differential scanning calorimetry, the second wax component has a melting point by differential scanning calorimetry is 70 to 95 ° C. (1) electrostatic according Latent image developing toner.
(3) A magnetic one-component electrostatic latent image developing toner containing a binder resin, wax, a charge control agent, magnetic powder and a colorant, wherein the binder resin contains a polystyrene resin and the magnetic The powder contains 35 to 60% by mass with respect to the total amount of toner, and as the wax, a first wax component having a penetration of 1 dmm or less at 25 ° C. and a second wax component having a penetration of 5 to 20 dmm And the melting point of the first wax component and the second wax component measured by differential scanning calorimetry is 70 to 140 ° C., respectively, and the first wax component has a melt viscosity of 1 × 10 ⁴ Pa · The temperature indicating s is 85 to 105 ° C., the second wax component has a melt viscosity of 1 × 10 ⁴ Pa · s and the temperature is 55 to 75 ° C., and the toner has a melt viscosity of 1 × 10 ⁴ Pa · s. Temperature Magnetic one-component toner for developing an electrostatic latent image, which is a 110-130 ° C..
(4) A magnetic ink character recognition toner containing a binder resin, a wax, a charge control agent, a magnetic powder, and a colorant, the polystyrene resin as the binder resin, and the magnetic powder as 30 to 70% by mass of a magnetic powder having a residual magnetization of 15 to 40 emu / g after application of a magnetic field of 795.8 kA / m with respect to the total amount of toner, and the penetration at 25 ° C. as the wax is 1 dmm It contains the following first wax component and a second wax component having a penetration of 5 to 20 dmm , and each of the first wax component and the second wax component has a melting point of 70 by differential scanning calorimetry. 140 is ° C., further wherein the first wax component temperature is 85 to 105 ° C. showing a melt viscosity 1 × 10 ⁴ Pa · s, the second wax component is a melt viscosity 1 × 10 ⁴ Pa Temperature indicating the s is 55 to 75 ° C., the toner is a toner for magnetic ink character recognition, wherein the temperature indicating a melt viscosity 1 × 10 ⁴ Pa · s is 110-130 ° C..
(5) 0.5 to 5% by mass of the first wax component, 0.5 to 5% by mass of the second wax component, and a total content of all the waxes of 1 to 10 with respect to the total amount of toner. The toner according to any one of (1) to ( 4 ), wherein the toner is% by mass.

According wherein (1) to the electrostatic latent image developing toner according to contain polystyrene resin as the binder resin, containing a first wax component with the second wax component as more waxes, wherein By setting the melting points by differential scanning calorimetry of the first wax component and the second wax component to 70 to 140 ° C., respectively , the linear velocity of the fixing roller can be reduced without deteriorating the offset property, blocking property, and image characteristics. Even when the speed exceeds 100 mm / second, fixing is possible in a low temperature region, so that there is an effect that power consumption is reduced and smearing properties are excellent. Further, the toner of the present invention is excellent in fluidity, environmental dependency, and durability characteristics. In particular, since the toner of the present invention contains a polystyrene resin as the main binder resin, it is suitable for use as a color toner because of its good low-temperature fixability, sharp melt property and excellent transparency. . Further, the first 85 to 105 ° C. and the temperature at which a melt viscosity 1 × 10 ⁴ Pa · s wax component, the temperature showing a melting viscosity 1 × 10 ⁴ Pa · s of the second wax component 55-75 By setting the temperature to 0 ° C., it is possible to further improve the smearing property and the fixing property in a low temperature region, and more reliably prevent the blocking property from deteriorating. Further, in the toner of the present invention, when the temperature at which the toner has a melt viscosity of 1 × 10 ⁴ Pa · s is 110 to 130 ° C., drum filming, image density reduction, fogging, etc. The effect of suppressing image defects can be further improved.

  According to the toner for developing a magnetic one-component electrostatic latent image described in (6) above, even in a magnetic one-component toner containing magnetic powder, the offset property, the blocking property, and the image characteristics are not deteriorated. It has the effect of being able to be fixed and having excellent smearing properties.

  According to the toner for MICR described in the above (7), it has excellent smearing properties and does not stain the MICR read head, so the rejection rate is considerably small, and the low temperature region does not deteriorate the offset property, blocking property, and image characteristics. It has the effect that it can be fixed by.

  In addition, as described in the above (8), by making the addition amount of the first wax component and the second wax component within the above range, the effect on the smear property and the fixability in the low temperature region are sufficiently obtained. Image defects such as drum filming, image density reduction, and fogging can be more reliably prevented.

<Toner for electrostatic latent image development>
Hereinafter, the electrostatic latent image developing toner according to the embodiment of the present invention will be described.
The type of the binder resin used in the electrostatic latent image developing toner of the present invention is not particularly limited, but a polystyrene resin is used as the main resin.

  Examples of the polystyrene resin include styrene homopolymers and copolymers with other copolymerizable monomers copolymerizable with styrene. Examples of other copolymerizable monomers include p-chlorostyrene; vinyl naphthalene; ethylene unsaturated monoolefins such as ethylene, propylene, butylene and isobutylene; vinyl halides such as vinyl chloride, vinyl bromide and vinyl fluoride. Vinyl esters such as vinyl acetate, vinyl propionate, vinyl benzoate, vinyl butyrate; methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, dodecyl acrylate, n-octyl acrylate, acrylic acid (Meth) acrylic acid esters such as 2-chloroethyl, phenyl acrylate, methyl α-chloroacrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate; other acrylates such as acrylonitrile, methacrylonitrile, acrylamide Vinyl ethers such as vinyl methyl ether and vinyl isobutyl ether; Vinyl ketones such as vinyl methyl ketone, vinyl ethyl ketone and methyl isopropenyl ketone; N-vinyl pyrrole, N-vinyl carbazole, N-vinyl indole, N- Examples thereof include N-vinyl compounds such as vinyl pyrrolidene. These may be used alone or in combination of two or more with a styrene monomer. In the present invention, it is particularly preferable to use a styrene-acrylic copolymer resin as the polystyrene resin.

  The glass transition temperature (Tg) of the polystyrene-based resin is preferably a value within the range of 50 to 70 ° C. When the glass transition temperature of the polystyrene-based resin is less than 50 ° C., the obtained toners are fused with each other, and the storage stability tends to be lowered. On the other hand, when the glass transition temperature of the polystyrene-based resin exceeds 70 ° C., the fixability of the toner tends to be poor. In addition, the glass transition temperature of polystyrene-type resin can be calculated | required from the change point of specific heat using a differential scanning calorimeter. The softening point of the polystyrene-based resin is 60 to 130 ° C, preferably 65 to 120 ° C.

  The binder resin may be a polystyrene resin alone, but may be mixed with other binder resins. Examples of other binder resins to be mixed with polystyrene resins include styrene resins, acrylic resins, polyethylene resins, polypropylene resins, vinyl chloride resins, polyester resins, polyamide resins, polyurethane resins, and polyvinyl resins. Examples thereof include thermoplastic resins such as alcohol resins, vinyl ether resins, N-vinyl resins, and styrene-butadiene resins. When other binder resins are mixed, the other binder resins should not exceed 50% by mass with respect to the total amount of binder resins.

  The binder resin preferably has two weight average molecular weight peaks (a low molecular weight peak and a high molecular weight peak). Specifically, the low molecular weight peak is in the range of 3,000 to 20,000, the other high molecular weight peak is in the range of 300,000 to 1,500,000, and Mw / Mn is 10 or more. Those are preferred. If the weight average molecular weight peak is within such a range, the toner can be fixed easily and offset resistance can be improved. The weight average molecular weight of the binder resin is determined by measuring the elution time from the column using gel permeation chromatography (GPC) and comparing it with a calibration curve prepared in advance using a standard polystyrene resin. Can be sought.

  The binder resin is preferably a thermoplastic resin from the viewpoint of good fixability, but the amount of cross-linked portion (gel amount) measured using a Soxhlet extractor is a value of 10% by mass or less, more preferably 0.8. If it is a value within the range of 1 to 10% by mass, a thermosetting resin may be used. By introducing a partially crosslinked structure in this way, it is possible to further improve the storage stability, form retention, and durability of the toner without deteriorating the fixability. Therefore, it is not necessary to use 100% by mass of the thermoplastic resin as the binder resin for the toner, and it is also preferable to add a crosslinking agent or to partially use a thermosetting resin.

  As the thermosetting resin, for example, an epoxy resin or an isocyanate resin can be used. More specifically, one or more of bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin, novolac type epoxy resin, polyalkylene ether type epoxy resin, cycloaliphatic type epoxy resin, isocyanate resin, etc. Combinations are listed.

  Further, as the binder resin, at least one selected from a hydroxy (hydroxy) group, a carboxyl group, an amino group, and a glycidoxy (epoxy) group in order to improve the dispersibility of the magnetic powder, the charge control agent and the like. It is preferable to use a resin having a functional group in the molecule. In addition, it can be confirmed using an FT-IR apparatus whether it has these functional groups, and also can be quantified using a titration method.

Next, other raw materials added to the toner of the present invention will be described.
The wax contained in the toner of the present invention is not particularly limited. For example, olefin waxes such as synthetic polyethylene wax and synthetic polypropylene wax, plant waxes such as carnauba wax, rice wax, and candelilla wax, and montan. Examples thereof include mineral waxes such as waxes, petroleum waxes such as paraffin wax and microcrystalline wax, ester waxes, and Teflon (registered trademark) waxes. In particular, Fischer-Tropsch wax produced from coal, natural gas or the like by the Fischer-Tropsch method is preferred.

  This Fischer-Tropsch wax is a waxy hydrocarbon synthesized by catalytic hydrogenation of carbon monoxide. Structurally, it is a linear paraffinic wax with few methyl branches. Examples of Fischer-Tropsch wax obtained from coal include H1 and H2 manufactured by Sazol. Examples of the Fischer-Tropsch wax obtained from natural gas include FT-100 manufactured by Shell-MDS.

  Since the Fischer-Tropsch wax has a low melting point, it has excellent fixability in a low temperature region, and since it has very low melting point components compared to existing petroleum-based paraffin wax, it also has excellent blocking properties. is there.

  The toner of the present invention includes a first wax component having a penetration of 1 dmm or less at 25 ° C. and a second wax component having a penetration of 5 to 20 dmm. If the wax does not contain a wax component with a penetration of 1 dmm or less, problems such as occurrence of hot offset, deterioration of smear, unstable heat storage stability, etc., and a wax component with a penetration of 5 to 20 dmm are contained. Otherwise, problems such as deterioration in fixing performance, offset, and smearing will occur, and if a wax component with a penetration greater than 20 dmm is included, the non-offset area will become narrower and image density will decrease. .

  That is, in the first wax component, due to its hardness, the surface property of the toner fixed on the recording paper becomes strong against the rubbing of the paper, and the back surface of the paper is not stained (good smearing property). Further, the second wax component promotes the low melting of the binder resin, and as a result, the adhesiveness to paper becomes good even at the fixing temperature in the low temperature region. On the other hand, when the wax component has a penetration of more than 1 dmm and less than 5 dmm, the adhesiveness to paper is weakened and there is a possibility of causing poor fixing such as peeling off from the paper. Furthermore, since the hardness is soft, when the recording sheets overlap, the toner fixed on one recording sheet may contaminate the back side of the other recording sheet. In addition, the measurement when the penetration is 0.5 dmm or less has a large error and cannot be performed accurately. The penetration of the wax is a value measured by ASTM D 1321 at 25 ° C.

The melting points of the first wax component and the second wax component by differential scanning calorimetry (DSC) are preferably 70 to 140 ° C., respectively . When the melting point is less than 70 ° C., the melt viscosity of the toner becomes extremely low and the cohesive force inside the toner is reduced, resulting in an offset and an image defect. On the other hand, when the melting point exceeds 140 ° C., the fixing property in the low temperature region is extremely deteriorated, and fixing failure occurs.

  Further, when Fischer-Tropsch wax is used as the wax, the melting point by DSC of the first wax component is 90 ° C. to 120 ° C., and the melting point by DSC of the second wax component is 70 ° C. to 95 ° C. Good. By setting the melting point of the first wax component to 90 ° C. or higher, it is possible to prevent the wax exposed on the surface of the toner fixed on the recording paper from being softened and to stain the back surface of the paper when the recording paper overlaps It becomes easy to prevent. Further, by setting the melting point of the second wax component to 70 ° C. or higher, the deterioration of the blocking property that occurs when the melting point is low is prevented. Further, when the melting point of the first wax component is 120 ° C. or lower, the binder resin tends to have a low melt viscosity, and the fixability in a low temperature region is improved. When the melting point of the second wax component is 95 ° C. or lower, the adhesion between the toner and paper is improved, and the fixing property in a low temperature region is improved.

  Here, the melting point by DSC refers to the peak temperature of endothermic reaction. For example, using DSC-6200 of Seiko Instruments Inc., the temperature is increased from 30 ° C. to 170 ° C. at a rate of 10 ° C./min, and then 0 The temperature is lowered to 10 ° C./min at a rate of 10 ° C./min, and again raised to 170 ° C. at a rate of 10 ° C./min. The peak temperature of the endothermic reaction at the second temperature rise is defined as the melting point of the wax.

The first wax component has a melt viscosity of 1 × 10 ⁴ Pa · s at 85 ° C. to 105 ° C., and the second wax component has a melt viscosity of 1 × 10 ⁴ Pa · s at 55 ° C. It is preferably ˜75 ° C. If the temperature at which the melt viscosity of the first wax component is 1 × 10 ⁴ Pa · s is less than 85 ° C., the wax exposed on the surface of the toner fixed on the recording paper becomes soft, so the back side of the paper is There is a risk of contamination (smear deterioration). If the temperature at which the melt viscosity of the second wax component is 1 × 10 ⁴ Pa · s is less than 55 ° C., the melt viscosity of the toner becomes extremely low, the internal cohesive force is lowered, and as a result, offset may occur. There is. In addition, when the temperature at which the melt viscosity of the first wax component shows 1 × 10 ⁴ Pa · s exceeds 105 ° C., the binder resin is unlikely to have a low melt viscosity, which leads to deterioration of fixability in a low temperature region. There is a fear. If the temperature at which the melt viscosity of the second wax component shows 1 × 10 ⁴ Pa · s exceeds 75 ° C., the adhesion between the toner and the paper is impaired, so that the fixability in the low temperature region may be deteriorated. is there. The melt viscosity of the toner and the melt viscosity of the wax are, for example, a CFT-500D manufactured by Shimadzu Corporation, a load of 30 kg F, a preheating of 70 ° C., a heating rate of 4 ° C./min, and a die of 1.0 × 1.0 ( mm).

  The addition amount of the first wax component and the addition amount of the second wax component are both 0.5 to 5% by mass, preferably 1 to 4% by mass with respect to the total amount of toner. If it is less than 0.5% by mass, the effect of the wax, that is, the smearing effect in the first wax component and the effect on the fixing property in the low temperature region in the second wax component are diminished. When the amount exceeds 5% by mass, the probability that the wax in the toner is present alone in both the first wax component and the second wax component increases, and contamination of the photoreceptor, that is, drum filming occurs. In addition, the charge amount distribution may be greatly disturbed, which may cause image defects such as image density reduction and fogging.

  Further, the total addition amount of the wax is preferably 1 to 10% by mass, more preferably 1 to 7% by mass, when the total amount of the toner is 100% by mass. If it is less than 1% by mass, the smearing effect and the fixing effect in a low temperature region may be reduced. If the amount exceeds 10% by mass, the probability that the wax in the toner is present alone increases, and the photosensitive member is contaminated, that is, drum filming occurs, or the charge amount distribution is greatly disturbed. There is a risk of causing image defects such as density reduction and fogging.

  In the toner of the present invention, from the viewpoint of improving the charge level and the charge rising characteristic (an index of whether or not to charge to a constant charge level in a short time), and obtaining characteristics with excellent durability and stability, It is preferable to add a control agent (charge control agent).

  The type of charge control agent is not particularly limited. For example, as a charge control agent exhibiting positive chargeability, nigrosine, a quaternary ammonium salt compound, and a resin type in which an amine compound is bonded to a resin. Examples thereof include a charge control agent. These charge control agents may be used in combination.

  Specific examples of such charge control agents include, for example, pyridazine, pyrimidine, pyrazine, orthooxazine, metaoxazine, paraoxazine, orthothiazine, metathiazine, parathiazine, 1,2,3-triazine, 1,2, as azine compounds. 4-triazine, 1,3,5-triazine, 1,2,4-oxadiazine, 1,3,4-oxadiazine, 1,2,6-oxadiazine, 1,3,4-thiadiazine, 1,3,5- Thiadiazine, 1,2,3,4-tetrazine, 1,2,4,5-tetrazine, 1,2,3,4-tetrazine, 1,2,4,6-oxatriazine, 1,3,4,5 -Azin Fast Red FC, Azinfast as a direct dye consisting of oxatriazine, phthalazine, quinazoline, quinoxaline, azine compound Red 12BK, azine violet BO, azine brown 3G, azine light brown GR, azine dark green BH / C, azine deep black EW and azine deep black 3RL, nigrosine as a nigrosine compound, nigrosine salt, nigrosine derivative, an acid composed of a nigrosine compound Nigrosine BK, Nigrosine NB, Nigrosine Z, naphthenic acid or higher fatty acid metal salts, alkoxylated amines, alkylamides, quaternary ammonium salts such as benzylmethylhexyldecylammonium, decyltrimethylammonium chloride, etc. Two or more types can be mentioned. In particular, the nigrosine compound is most suitable for the use of a positively chargeable toner from the viewpoint of obtaining quicker start-up properties.

  Further, a resin or oligomer having a quaternary ammonium salt, a resin or oligomer having a carboxylic acid salt, a resin or oligomer having a carboxyl group, etc. can also be used as the charge control agent. More specifically, a quaternary ammonium salt is used. Polystyrene resin having quaternary ammonium salt, styrene-acrylic resin having quaternary ammonium salt, polyester resin having quaternary ammonium salt, polystyrene resin having carboxylate, carboxylate Acrylic resin having carboxylic acid, styrene-acrylic resin having carboxylate, polyester resin having carboxylate, polystyrene resin having carboxyl group, acrylic resin having carboxyl group, styrene-acrylic resin having carboxyl group , Cal One or more of such polyester resins having a cyclohexyl group.

  In particular, a styrene-acrylic resin (styrene-acrylic copolymer) having a quaternary ammonium salt, carboxylate or carboxyl group as a functional group can easily adjust the charge amount to a value within a desired range. It is optimal from the point of view. Moreover, as a preferable acrylic resin in the above-mentioned styrene-acrylic resin or acrylic resin itself, (meth) acrylic acid alkyl ester includes methyl acrylate, ethyl acrylate, n-propyl acrylate, iso-propyl acrylate. N-butyl acrylate, iso-butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, and the like.

  Furthermore, as the quaternary ammonium salt compound, a unit derived from a dialkylaminoalkyl (meth) acrylate through a quaternization step is used. Examples of the derived dialkylaminoalkyl (meth) acrylate include di (lower) such as dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, dipropylaminoethyl (meth) acrylate, and dibutylaminoethyl (meth) acrylate. Alkyl) aminoethyl (meth) acrylate; dimethylmethacrylamide, dimethylaminopropylmethacrylamide are preferred. Further, hydroxy group-containing polymerizable monomers such as hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and N-methylol (meth) acrylamide can be used in combination during polymerization.

  As the charge control agent exhibiting negative chargeability, for example, organometallic complexes and chelate compounds are effective, and there are monoazo metal complexes, acetylacetone metal complexes, aromatic hydroxycarboxylic acids, and aromatic dicarboxylic acid-based metal complexes. . In addition, aromatic hydroxycarboxylic acids, aromatic mono- and polycarboxylic acids and metal salts thereof, anhydrides, esters, phenol derivatives such as bisphenol, and the like are also included.

  The addition amount of the charge control agent is preferably set to a value in the range of 0.1 to 15% by mass with respect to the total amount of toner. When the addition amount of the charge control agent is less than 0.1% by mass, it becomes difficult to stably impart charging characteristics to the toner, and the image density tends to be low and the durability tends to be low. In addition, poor dispersion tends to occur, so-called fogging tends to occur, and photoconductor contamination tends to increase. On the other hand, when the addition amount of the charge control agent exceeds 15% by mass, there is a tendency that defects such as contamination of the photoconductor tend to occur due to environmental resistance, in particular, charging failure and image failure under high temperature and high humidity. Therefore, from the viewpoint of a better balance between the charge control function and the durability of the toner, the addition amount of the charge control agent is more preferably set to a value within the range of 0.5 to 8.0% by mass. .

  The toner of the present invention may be mixed with a developer carrier such as a ferrite carrier to form a two-component developer, or may be used alone as a one-component developer.

  The toner of the present invention can be treated with colloidal silica, hydrophobic silica or the like for the purpose of maintaining the fluidity and storage stability of the toner. The toner of the present invention preferably has an average particle size of about 5 to 12 μm.

The toner for developing an electrostatic latent image of the present invention has a temperature showing a melt viscosity of 1 × 10 ⁴ Pa · s of 110 to 130 ° C., preferably 115 to 125 ° C. When it is lower than 110 ° C., it becomes difficult to apply a shear during kneading, and the dispersibility of the wax may be extremely deteriorated. As a result, there is a possibility that the charge amount is disturbed and the image density is lowered, or the photoreceptor is contaminated. Furthermore, since the dispersibility of the wax is poor, there is a possibility that the characteristics of the original wax cannot be exhibited. On the other hand, when the temperature exceeds 130 ° C., the difference between the melt viscosity of the binder resin and the melt viscosity of the wax increases, so that the wax may not be uniformly dispersed. As a result, there is a possibility that the charge amount is disturbed and the image density is lowered, or the photoreceptor is contaminated.

<Toner for magnetic one-component electrostatic latent image development>
Next, the magnetic one-component electrostatic latent image developing toner according to the present invention will be described.
Examples of the magnetic powder added to the toner for developing a magnetic one-component electrostatic latent image of the present invention include ferrite, magnetite and other iron, cobalt, nickel and other ferromagnetic metals, alloys, or elements thereof. Or an alloy that does not contain a ferromagnetic element but becomes ferromagnetic when subjected to an appropriate heat treatment, or chromium dioxide. These magnetic powders are uniformly dispersed in the toner binder in the form of fine powder having an average particle size of 0.1 to 1 μm, preferably 0.1 to 0.5 μm. In addition, the magnetic powder may be the above metal alone or may be obtained by subjecting the above metal to a surface treatment with a surface treatment agent such as a titanium coupling agent or a silane coupling agent.

  The magnetic powder added to the toner of the present invention is contained in the toner in an amount of 35 to 60% by mass, preferably 40 to 60% by mass. When the content exceeds 60% by mass, the image density tends to be low, and the fixability tends to be extremely lowered. If it is less than 35% by mass, fog is deteriorated and image defects are caused. Other than that, it is the same as the toner for developing an electrostatic latent image described above.

<Magnetic ink character recognition toner>
Next, the magnetic ink character recognition (hereinafter referred to as MICR) toner according to the present invention will be described.
As the magnetic powder added to the MICR toner of the present invention, magnetite, iron powder, ferrite or the like is used, and the amount of magnetic memory when the magnetic field is zero after applying 795.8 kA / m (10 kOe), that is, The residual magnetization is about 15 to 40 emu / g, preferably about 20 to 35 emu / g. The residual magnetization of the magnetic powder can be measured with a vibrating sample magnetometer (VSM-P7-15 type: manufactured by Toei Industry Co., Ltd.).

  The magnetic powder preferably has an average particle size of about 0.1 to 0.5 μm and is uniformly dispersed in the toner binder resin in the form of fine powder. In addition, the magnetic powder may be the above metal alone or may be obtained by subjecting the above metal to a surface treatment with a surface treatment agent such as a titanium coupling agent or a silane coupling agent. In the one-component development method, the magnetic powder is mixed in the toner for MICR at 30 to 70% by mass, preferably 30 to 60% by mass. If the blending amount exceeds 70% by mass, the image density tends to be low, and the fixability tends to extremely decrease. If it is less than 30% by mass, fog may be deteriorated and image defects may be caused. In the two-component development method, 15 to 40% by mass, preferably 20 to 30% by mass, is added to the MICR toner. Other than that, it is the same as the toner for developing an electrostatic latent image described above.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated further in detail, this invention is not limited to a following example.

[Examples 1 to 4]
A biaxial extrusion of a mixture of styrene-acrylic copolymer resin, wax A, wax B, charge control agent (Clariant Japan Copy Blue PR), and colorant (Mitsubishi Chemical Carbon Black, MA-100) at the following blending ratio After melt-kneading with a machine, this was cooled, pulverized and classified to obtain a powder having an average particle diameter of 7 μm. To this powder, 2% by mass of titanium oxide (ST-100 manufactured by Titanium Industry Co., Ltd.) and 0.5% by mass of silica (SiO ₂ ) (RA-200 manufactured by Nippon Aerosil Co., Ltd.) were externally added and mixed to obtain a surface. A toner was prepared by adhering to the toner. As the styrene-acrylic copolymer resin, those having a weight average molecular weight (Mw): 80,000, Mw / Mn = 15, a glass transition temperature (Tg): 60 ° C., and a softening point: 80 ° C. were used. Table 1 shows the penetration of wax A and wax B used. The penetration of wax A and wax B was measured according to ASTM D 1321 at 25 ° C.

Styrene-acrylic copolymer resin 90 parts by weight Wax A (first wax component) 2 parts by weight Wax B (second wax component) 2 parts by weight Charge control agent 1 part by weight Colorant 5 parts by weight

  Next, 5 parts by mass of the obtained toner and 100 parts by mass of ferrite carrier are mixed to form a two-component developer, and an evaluation image is obtained using a page printer (product number: FS-3800) manufactured by Kyocera Mita Corporation. The properties, fixing properties, smear properties and offset properties were evaluated. Moreover, blocking property was evaluated and the charge amount was measured simultaneously. The results are shown in Table 2.

[Comparative Examples 1-5]
A toner was prepared in the same manner as in Examples 1 to 4 except that waxes having the penetration shown in Table 1 were used as wax A and wax B, and image characteristics, fixing properties, smear properties, offset properties and blocking properties were produced. Each sex was evaluated. However, when either one of the waxes A and B was not added, the amount of the other wax added was 4 parts by mass. The results are shown in Table 2.

The evaluation method for each item shown in Table 2 is as follows (1) to (6).
(1) Image characteristics In the normal environment (20 ° C, 65% RH), an image evaluation pattern is printed at the initial stage to obtain an image, and a solid image is measured using a Macbeth reflection densitometer (RD914: manufactured by Macbeth). The fog was visually observed and image characteristics were evaluated according to the following criteria. The image density was determined by measuring an arbitrary 9 points of the solid image to obtain an average value, and a value of 1.30 or more was determined as good.
○: Good fogging.
Δ: Slight fogging occurs.
X: The fog is terrible.
(2) Charge amount The amount of charge (μC / g) obtained by mixing 5 parts by weight of the toner and 100 parts by weight of the ferrite carrier and frictionally charging in a normal environment for 60 minutes is the blow-off powder manufactured by Kyocera Chemical. Measurement was performed using a charge amount measuring device (product number: B-200).
(3) Fixing property The fixing temperature is set to 180 ° C., and cooling is performed for 10 minutes in a normal environment (20 ° C., 65% RH) with the power off. A sheet for printing was used to obtain an image for measurement. This image was rubbed 10 times with a load of brass weight (1 kg) wrapped in cotton cloth. The image density before and after this operation was measured with a Macbeth reflection densitometer, the ratio of the density was obtained to determine the fixing property, and evaluated according to the following criteria.
○: Fixing rate is 95% or more.
Δ: The fixing rate is 90% or more and less than 95%.
X: Fixing rate is less than 90%.
(4) Offset property In a normal environment (20 ° C., 65% RH), the fixing temperature was set to 230 ° C., and 10 offset pattern images were continuously printed. This image was visually evaluated to evaluate the offset property according to the following criteria.
○: No offset occurs.
Δ: Some offset occurred.
X: Severe offset occurred.
(5) Smear property A load was applied to a brass weight (1 kg) wrapped with paper and the measurement image obtained in (3) above was rubbed 20 times. After this operation, the degree of dirt on the rubbed paper side was visually observed, and smearing was evaluated according to the following criteria.
○: Good without contamination.
Δ: Slightly stained.
X: Dirt is terrible.
(6) Blocking property The toner is packed in a glass container and left at 50 ° C. for 100 hours. Evaluate caking occurrence after standing.
○: Caking is not allowed.
Δ: Some soft caking is observed.
X: Considerable hard caking is recognized.

  As shown in Table 2, in Examples 1 to 4, toners that can be fixed in a low temperature region without deteriorating offset property, blocking property, and image characteristics and excellent in smear properties were obtained.

[Examples 5 to 8]
A biaxial extrusion of a mixture of styrene-acrylic copolymer resin, wax C, wax D, charge control agent (Clariant Japan Copy Blue PR), and colorant (Mitsubishi Chemical Carbon Black, MA-100) at the following blending ratio After melt-kneading with a machine, this was cooled, pulverized and classified to obtain a powder having an average particle diameter of 7 μm. To this powder, 2% by mass of titanium oxide (ST-100 manufactured by Titanium Industry Co., Ltd.) and 0.5% by mass of silica (SiO ₂ ) (RA-200H manufactured by Nippon Aerosil Co., Ltd.) were externally added and mixed to obtain a surface. A toner was prepared by adhering to the toner. As the styrene-acrylic copolymer resin, those having a weight average molecular weight (Mw): 80,000, Mw / Mn = 15, a glass transition temperature (Tg): 60 ° C., and a softening point: 80 ° C. were used. Table 3 shows the penetration of the wax C and wax D used. The penetration of wax C and wax D was measured according to ASTM D 1321 at 25 ° C. The melting point (° C.) of the wax was measured under the above-described conditions by DSC (differential scanning calorimetry).

Styrene-acrylic copolymer resin X parts by weight Wax C (first wax component) Number of parts shown in Table 3 Wax D (second wax component) Number of parts shown in Table 3 Charge control agent 1 part by weight Colorant 5 parts by weight The addition amount X of the styrene-acrylic copolymer resin is a value obtained by subtracting the addition amounts of the waxes C and D, the charge control agent and the colorant from 100 parts by mass of the whole toner material.

  Next, 5 parts by mass of the obtained toner and 100 parts by mass of ferrite carrier are mixed to form a two-component developer, and an evaluation image is obtained using a page printer (product number FS-3800) manufactured by Kyocera Mita Co., Ltd. The fixing property, smear property, and offset property were evaluated. Moreover, blocking property was evaluated and the charge amount was measured simultaneously. The results are shown in Table 4. In addition, the evaluation method of each item was made the same as the said Examples 1-4.

[Comparative Examples 6-9]
A toner was prepared in the same manner as in Examples 5 to 8 except that waxes having physical properties shown in Table 3 were used as wax C and wax D, and blended in the addition amounts shown in Table 3. Property, smear property, offset property and blocking property were evaluated. The results are shown in Table 4.

  As shown in Table 4, in Examples 5 to 8, toners that can be fixed in a low temperature region without deteriorating offset property, blocking property, and image characteristics and excellent in smearing property were obtained.

[Examples 9 to 12]
A mixture of styrene-acrylic copolymer resin, magnetic powder (magnetite, saturation magnetization of 80 Am ² / kg at 10 kOe), wax E, wax F, and a charge control agent (Clariant Japan Copy Blue PR) at the following blending ratio: After melt-kneading with a twin-screw extruder, this was cooled, pulverized and classified to obtain a powder having an average particle size of 7 μm. To this powder, 2% by mass of titanium oxide (ST-100 manufactured by Titanium Industry Co., Ltd.) and 0.5% by mass of silica (SiO ₂ ) (RA-200H manufactured by Nippon Aerosil Co., Ltd.) were externally added and mixed to obtain a surface. A toner was prepared by adhering to the toner. As the styrene-acrylic copolymer resin, those having a weight average molecular weight (Mw) of 80,000, Mw / Mn = 15, a glass transition temperature (Tg) of 60 ° C., and a softening point of 80 ° C. were used. Table 5 shows the penetrations of wax E and wax F used. The penetration of wax E and wax F was measured according to ASTM D 1321 at 25 ° C. As for the magnetic powder, about 90 mg of the magnetic powder is separated, and the residual in a measuring magnetic field 795.8 kA / m (10 kOe) using a vibrating sample magnetometer (VSM-P7-15 type: manufactured by Toei Kogyo). Magnetization and saturation magnetization were measured.

Styrene-acrylic copolymer resin 50 parts by weight Magnetic powder 45 parts by weight Wax E (first wax component) 2 parts by weight Wax F (second wax component) 2 parts by weight Charge control agent 1 part by weight

  Next, using the obtained toner as a magnetic one-component developer and using a Kyocera page printer (FS-3800) equipped with an amorphous silicon (a-Si) photoreceptor, image characteristics, fixing properties, smear properties, offset properties The blocking property was evaluated and the charge amount was measured at the same time. The results are shown in Table 6. In addition, the evaluation method of each item was made the same as the said Examples 1-4.

[Comparative Examples 10-14]
As wax E and wax F, toners were prepared in the same manner as in Examples 9 to 12 except that the wax having the penetration shown in Table 5 was used, and image properties, fixing properties, smear properties, offset properties and The blocking property was evaluated. However, when either one of the waxes E and F was not added, the amount of the other wax added was 4 parts by mass. The results are shown in Table 6.

[Examples 13 and 14 and Comparative Examples 15 and 16]
Furthermore, Table 7 shows the evaluation results of image characteristics and fixability when the amount of magnetic powder added is changed to 30, 45, 60, and 65 parts by mass in the properties of Example 9. The toner production, image characteristics, and fixability evaluation methods are the same as described above.

  As shown in Tables 6 and 7, the toners (Examples 13 and 14) within the scope of the present invention can be fixed in a low temperature region without deteriorating the offset property, blocking property, and image property, and smear properties. It was excellent.

[Examples 15 to 18]
Mixture of styrene-acrylic copolymer resin, magnetic powder (magnetite, residual magnetization 30 Am ² / g after application of 10 kOe), wax G, wax H, and charge control agent (Copy Blue PR manufactured by Clariant Japan) at the following blending ratio After being melt-kneaded with a twin screw extruder, this was cooled, pulverized and classified to obtain a powder having an average particle size of 7 μm. To this powder, 2% by mass of titanium oxide (ST-100 manufactured by Titanium Industry Co., Ltd.) and 0.5% by mass of silica (SiO ₂ ) (RA-200H manufactured by Nippon Aerosil Co., Ltd.) were externally added, mixed and surfaced A toner for MICR was prepared by adhering to the toner. As the styrene-acrylic copolymer resin, those having a weight average molecular weight (Mw): 80,000, Mw / Mn = 15, a glass transition temperature (Tg): 60 ° C., and a softening point: 80 ° C. were used. Table 8 shows the penetrations of the wax G and the wax H used. The penetration of wax G and wax H was measured according to ASTM D 1321 at 25 ° C. Further, the residual magnetization of the magnetic powder used for the MICR toner was measured using a vibrating sample magnetometer (VSM-P7-15: manufactured by Toei Kogyo Co., Ltd.).

Styrene-acrylic copolymer resin 50 parts by weight Magnetic powder 45 parts by weight Wax G (first wax component) 2 parts by weight Wax H (second wax component) 2 parts by weight Charge control agent 1 part by weight

  Next, using the obtained MICR toner as a magnetic one-component developer and using a Kyocera page printer (FS-3750) equipped with an a-Si photoreceptor, image characteristics, fixing properties, smear properties, offset properties, blocking At the same time, the charge amount was measured. Further, a check was prepared by printing a MICR pattern, and the rejection rate (probability of being unreadable) was measured through a continuous 5,000-sheet MICR reader. The results are shown in Table 9.

[Comparative Examples 17 to 21]
A toner was prepared in the same manner as in Examples 15 to 18 except that the wax having the penetration shown in Table 8 was used as the wax G and the wax H, and image characteristics, fixing properties, smear properties, offset properties, and blocking properties were produced. Sexuality was evaluated. However, when either one of the waxes G and H was not added, the amount of the other wax added was 4 parts by mass.

The rejection rate evaluation method shown in Table 9 is as follows.
(7) Rejection rate Using the above toner as a magnetic one-component developer, using a page printer (FS-3750) manufactured by Kyocera Mita Co., Ltd. equipped with an a-Si photosensitive member, in a normal environment (20 ° C., 65% RH). ), Print a MICR pattern to create a check, pass 5,000 checks continuously through the MICR reader, and measure the percentage rejected without being read (rejection rate). It was. About the item other than this, it evaluated similarly to the said Examples 1-4. The results are shown in Table 9.

  As shown in Table 9, in Examples 15 to 18, the smear property is excellent and the MICR read head is not soiled. Therefore, the rejection rate is small, and the offset property, blocking property, and image characteristics are not deteriorated. The toner for MICR that can be fixed by the above method was obtained.

[Examples 19 to 25]
Styrene-acrylic copolymer resin, Fischer-Tropsch wax I, Fischer-Tropsch wax J, charge control agent (Clariant Japan's Copy Blue PR), and colorant (Mitsubishi Chemical carbon black, MA-100) at the following blending ratios This mixture was melt-kneaded with a twin-screw extruder, then cooled, pulverized and classified to obtain a powder having an average particle diameter of 7 μm. To this powder, 2% by mass of titanium oxide (ST-100 manufactured by Titanium Industry Co., Ltd.) and 0.5% by mass of silica (SiO ₂ ) (RA-200 manufactured by Nippon Aerosil Co., Ltd.) were externally added and mixed to obtain a surface. A toner was prepared by adhering to the toner. The temperature at which the toner has a melt viscosity of 1 × 10 ⁴ Pa · s was 120 ° C. As the styrene-acrylic copolymer resin, those having a weight average molecular weight (Mw): 80,000, Mw / Mn = 15, a glass transition temperature (Tg): 60 ° C., and a softening point: 80 ° C. were used. Table 10 shows the penetrations of the Fischer-Tropsch wax I and Fischer-Tropsch wax J used. The penetration of Fischer-Tropsch wax I and Fischer-Tropsch wax J was measured according to ASTM D 1321 at 25 ° C.

Styrene-acrylic copolymer resin 90 parts by weight Fischer-Tropsch wax I (first wax component) 2 parts by weight Fischer-Tropsch wax J (second wax component) 2 parts by weight Charge control agent 1 part by weight Colorant 5 parts by weight

Next, 5 parts by mass of the obtained toner and 100 parts by mass of ferrite carrier are mixed to form a two-component developer, and a page made by Kyocera Mita Co., Ltd. using a heat roller for fixing with a diameter of 30 mm and a linear speed of 100 mm / sec. An evaluation image was obtained using a printer (product number: FS-3800), and image characteristics, fixing properties, smear properties, and offset properties were evaluated in the same manner as in Example 1 above. Moreover, blocking property was evaluated and the charge amount was measured simultaneously. The results are shown in Table 11.

  As shown in Table 11, in Examples 19 to 25, toners capable of being fixed in a low temperature region and having excellent smearing properties were obtained without deteriorating offset property, blocking property, and image characteristics.

[Examples 26 and 27]
Further, Table 12 shows the evaluation results when the melt viscosity of the toner is changed with the properties of Example 19. The toner production method is the same as in Example 19 above. In Table 12, “viscosity” represents a temperature indicating a melt viscosity of 1 × 10 ⁴ Pa · s of the toner. The drum contamination evaluation method for the photosensitive drum is as follows. Other evaluation methods are the same as in Examples 1 to 4.

(8) Drum contamination Drum contamination was evaluated by the following judgment criteria by visually observing the surface of the photosensitive drum after 100,000 sheets were printed using A4 paper and the printing rate was set to 5%.
○: The drum surface is visually observed, and no cloudiness is observed on the surface.
Δ: Slight cloudiness is observed.
X: Cloudiness is observed and there is a film-like deposit (wax).

As shown in Table 12, by setting the temperature at which the toner has a melt viscosity of 1 × 10 ⁴ Pa · s to 110 ° C. to 130 ° C., fixing can be performed in a low temperature region without deteriorating thermal characteristics and image characteristics. A toner was obtained.

[Examples 28 and 29]
Further, Table 13 shows the evaluation results when the temperature at which the melt viscosity of the wax I is 1 × 10 ⁴ Pa · s in the properties of Example 19 is changed. The toner production method is the same as in Example 19 above. The evaluation method is the same as in Examples 1-4.

[Examples 30 and 31]
Furthermore, Table 14 shows the evaluation results when the temperature at which the melt viscosity of the wax J is 1 × 10 ⁴ Pa · s in the properties of Example 19 is changed. The toner production method is the same as in Example 19 above. The evaluation method is the same as in Examples 1-4.

Claims (5)

A toner for developing an electrostatic latent image containing a binder resin, a wax, a charge control agent and a colorant, wherein the toner contains a polystyrene resin as the binder resin, and the wax has a penetration at 25 ° C. Containing a first wax component of 1 dmm or less and a second wax component having a penetration of 5 to 20 dmm,
And Ri 70 to 140 ° C. der each melting point by differential scanning calorimetry of the first wax component and the second wax component,
The first wax component has a melt viscosity of 1 × 10 ⁴ Pa · s at 85 to 105 ° C., and the second wax component has a melt viscosity of 1 × 10 ⁴ Pa · s at 55 to 75 ° C. And
The toner for developing an electrostatic latent image toner temperature showing a melting viscosity 1 × 10 ⁴ Pa · s is characterized 110-130 ° C. der Rukoto. When one or both of the first and second wax components is a Fischer-Tropsch wax made by a Fischer-Tropsch process, and both the first and second wax components are Fischer-Tropsch wax, The electrostatic latent image development according to claim 1, wherein the first wax component has a melting point of 90 to 120 ° C by differential scanning calorimetry, and the second wax component has a melting point of 70 to 95 ° C by differential scanning calorimetry. Toner. A magnetic one-component electrostatic latent image developing toner containing a binder resin, a wax, a charge control agent, a magnetic powder and a colorant, comprising a polystyrene resin as the binder resin, 35 to 60% by mass based on the total amount of toner, and further, the wax contains a first wax component having a penetration of 1 dmm or less at 25 ° C. and a second wax component having a penetration of 5 to 20 dmm. ,
And the melting points by differential scanning calorimetry of the first wax component and the second wax component are 70 to 140 ° C., respectively.
The first wax component has a melt viscosity of 1 × 10 ⁴ Pa · s at 85 to 105 ° C., and the second wax component has a melt viscosity of 1 × 10 ⁴ Pa · s at 55 to 75 ° C. And
The toner for developing a magnetic one-component electrostatic latent image, wherein the toner has a melt viscosity of 1 × 10 ⁴ Pa · s and a temperature of 110 to 130 ° C. A magnetic ink character recognition toner containing a binder resin, a wax, a charge control agent, a magnetic powder, and a colorant, comprising a polystyrene resin as the binder resin and 795.8 kA as the magnetic powder. A magnetic powder having a residual magnetization of 15 to 40 emu / g after application of a magnetic field of / m is contained in an amount of 30 to 70% by mass with respect to the total amount of toner, and the wax has a penetration of 1 dmm or less at 25 ° C. 1 wax component and a second wax component having a penetration of 5 to 20 dmm ,
And the melting points by differential scanning calorimetry of the first wax component and the second wax component are 70 to 140 ° C., respectively.
The first wax component has a melt viscosity of 1 × 10 ⁴ Pa · s at 85 to 105 ° C., and the second wax component has a melt viscosity of 1 × 10 ⁴ Pa · s at 55 to 75 ° C. And
Magnetic toner character recognition toner, wherein the toner has a melt viscosity of 1 × 10 ⁴ Pa · s and a temperature of 110 to 130 ° C. The first wax component is 0.5 to 5% by mass, the second wax component is 0.5 to 5% by mass, and the total content of all waxes is 1 to 10% by mass with respect to the total amount of toner. the toner according to any one of a claims 1-4.