JP5071062B2 - Electrostatic latent image developing toner and image forming method - Google Patents

Description

  The present invention relates to an electrostatic latent image developing toner used in an electrophotographic image forming method.

  Color electrophotographic image forming methods have been widely used from office color multifunction peripherals and laser printers, but in recent years the market for color production printing has expanded. (For example, refer to Patent Document 1.) In the latter color production print area, printed products are sold as products as they are by printers including small and medium-sized printers, and are often in line with the former office use. Since the color tone of product photos is directly linked to the sales of products, the demand for image quality such as color reproduction is naturally severe.

  JAPAN COLOR color reproduction printing 2001 was adopted as a standard color in this printing field, and communication between printers was improved by this. In the electrophotographic image forming method, reproduction of JAPAN COLOR 2001 is the primary goal, and in recent years, major electrophotographic image forming apparatus manufacturers can cover this color reproduction range.

However, due to the development of digital image input devices such as high-spec digital cameras and display technologies, the edited image on the display has a gap with the relatively narrow JAPAN COLOR color reproduction, and the user has a further color reproduction area. Enlargement is now required.
That is, it is required to achieve the color gamut and color reproduction of s-RGB, which is a display standard by transmitted light, and it is considered that a new color material is necessary for the achievement. s-RGB is an international color space standard established by the IEC (International Electrotechnical Commission) in October 1998. Regardless of the type of personal computer or equipment such as a display or printer, this is an expression format for reproducing colors as intended. In particular, it is necessary to increase the saturation of secondary colors in the green and blue regions, and means for achieving this is required.

Further, there has been a demand for a gloss control technology commensurate with the expansion of the color gamut and an offset resistance and release agent leaching technology that can cope with high-speed image formation.
JP-A-11-212303

  SUMMARY OF THE INVENTION An object of the present invention is to provide a cyan electrostatic latent image developing toner (sometimes simply referred to as toner) having high brightness, good color tone, high gloss, and no gloss unevenness, and an image forming method. is there. Furthermore, it is to provide an anti-offset property and release agent leaching technology that can be applied to high-speed image formation that can be applied to commercial printing applications.

The object of the present invention is achieved by using a colorant having the following chemical structure.
1. A toner for developing an electrostatic latent image, wherein the colorant comprises only a compound represented by the following general formula (I).

(In the formula, M ₁ represents a metal atom of any _one of a silicon atom, a germanium atom and a tin atom. Z represents an alkoxy group having 9 to 18 carbon atoms and a substituent having 9 to 18 carbon atoms. .A ^1, a ^2, a ³ and a ^4, which also shows an aryloxy group, a has represents an atomic group shown below.)

2. 2. The electrostatic latent image developing toner according to 1 above, wherein M ₁ is a silicon atom.
3. 3. The electrostatic latent image developing toner according to 1 or 2, wherein each Z is independently an alkoxy group having 9 to 18 carbon atoms.
4). 4. An image forming method comprising: forming an image using the electrostatic latent image developing toner according to any one of 1 to 3 above.

  According to the present invention, it is possible to provide a cyan toner having high brightness, good color tone, high gloss, and no gloss unevenness, and an image forming method. Furthermore, it is to provide an anti-offset property and release agent leaching technology that can be applied to high-speed image formation that can be applied to commercial printing applications.

The present invention will be further described.
[Colorant of the present invention]
The colorant according to the present invention is a phthalocyanine-based colorant, which is light blue, excellent in lightness, and can provide a printed matter having a good color tone. In addition, the colorant of the present invention is present in a state of surrounding the wax domains in the toner particles, and there is a certain ratio. This is because the dispersion of the wax as a release agent is stabilized by the action of the colorant and its substituent, and the dispersion diameter of the wax can be controlled within an appropriate range.

In the chemical structural formula described in the general formula (I), the central metal M ₁ is particularly preferably a silicon atom from the viewpoint of uniformly controlling the wax dispersion diameter. In addition, from the viewpoint of adjusting the color tone, the atomic groups of A ¹ , A ² , A ³ and A ⁴ are in the form of 4 carbon atoms bonded to the mother nucleus and bonded to the mother nucleus to form a benzene ring. The form which comprises is preferable. The atomic group of A ¹ , A ² , A ³ and A ⁴ represented as the general formula (II) can be combined with a chlorine group, a trifluoromethyl group or a nitro group as a substituent to adjust the color tone.

The substituent Z bonded to the central metal M ₁ is particularly preferably an alkoxy group having 9 to 18 carbon atoms from the viewpoint of uniformly dispersing the wax domain.

  Typical compound examples are shown below.

  The content of the coloring material represented by the general formula (I) with respect to the total toner mass is preferably 2 to 10 mass%, more preferably 4 to 8 mass%.

  The particle diameter of the colorant in the toner particles is preferably 24 nm to 1600 nm, and more preferably 60 nm to 700 nm. Here, the colorant particle diameter is expressed by an arithmetic average value obtained by measuring a ferret horizontal diameter of 200 colorant particles by observation with a transmission electron microscope after preparing a section having a thickness of 100 nm with an ultramicrotome. It is a thing.

  Next, the compound represented by the general formula (I) can be produced by, for example, a known method disclosed in the following literature. For the production method of the phthalocyanine compound represented by the general formula (I), for example, the contents described in the following patent specifications can be referred to. That is, U.S. Pat. Etc.

[Toner of the present invention]
Examples of the toner production method include a dry pulverization method, and a wet method such as a suspension polymerization method, an emulsion association method, and a dissolution suspension method, but the transparency of the toner, specifically, the colorant particles in the toner particles. From the viewpoint of controlling the diameter, a pulverization method and an emulsion association method are preferred.

  Next, the particle diameter of the toner according to the present invention will be described.

  The toner according to the present invention preferably has a volume-based median diameter (D50v) of 3 μm or more and 8 μm or less.

  The volume-based median diameter (D50v diameter) of toner can be measured and calculated using a device in which a computer system for data processing is connected to Multisizer 3 (manufactured by Beckman Coulter, Inc.).

  As a measurement procedure, 0.02 g of toner is blended with 20 ml of a surfactant solution (for example, a surfactant solution obtained by diluting a neutral detergent containing a surfactant component 10 times with pure water for the purpose of dispersing the toner). Then, ultrasonic dispersion is performed for 1 minute to prepare a toner dispersion. This toner dispersion is injected into a beaker containing ISOTON II (manufactured by Beckman Coulter, Inc.) in a sample stand with a pipette until a measurement concentration of 5 to 10% is reached, and the measuring machine count is set to 2500. To do. The aperture size of the multisizer 3 is 50 μm.

  The toner according to the present invention preferably has a coefficient of variation (CV value) in the volume-based particle size distribution of 2% to 21%, more preferably 5% to 15%.

  The coefficient of variation (CV value) in the volume-based particle size distribution represents the degree of dispersion in the particle size distribution of the toner particles on the volume basis, and is defined by the following equation.

CV value (%) = (standard deviation in number particle size distribution) / (median diameter (D50v) in number particle size distribution) × 100
The smaller the CV value, the sharper the particle size distribution, and the larger the toner particle size. That is, since the size and the charge of the toner particles are proportional in principle, the development efficiency and the transfer efficiency are improved in the development process and the transfer process, respectively. On the other hand, if the toner particles are too large in size and charge, the repulsive force acts on each other's charge, causing toner dust in fine dot images and fine lines required for digital image formation and unclear edges. Therefore, it is preferable to control to the above CV value range. Preferred range of softening temperature, glass transition point and molecular weight The softening temperature (softening point) is 75 ° C to 112 ° C, preferably 80 ° C to 105 ° C, more preferably 85 ° C to 98 ° C. It can be controlled by molecular weight distribution, the top peak of GPC is about 10,000 to 12000, and the glass transition point is 10 ° C to 44 ° C, preferably 25 ° C to 38 ° C. In the case of a styrene / acrylic toner, the glass transition point can be controlled by a monomer ratio such as butyl acrylate or 2-ethylhexyl acrylate. The addition number of ethylene oxide or propylene oxide added to bisphenol A of the polyester toner is set to 3 or more. By controlling the carbon number of the aliphatic alkylene diol from 4 to 18, the glass transition point can be controlled.
The colorant used in the toner according to the present invention has a stable property that the spectrum does not change even under the influence of heat, but is necessary for fixing by setting the softening point in the above range. Thermal energy can be further reduced.

The softening point of the toner can be controlled by, for example, the following methods alone or in combination. That is,
(1) Adjusting the type and composition ratio of monomers used for resin formation (2) Adjusting the molecular weight of the resin according to the type and addition amount of the chain transfer agent (3) Adjusting the type and addition amount of wax and the like The method for measuring the softening point temperature of the toner is specifically a “flow tester CFT-500 (manufactured by Shimadzu Corporation)”, formed into a cylindrical shape with a height of 10 mm, and heated at a heating rate of 6 ° C./min. While applying a pressure of 1.96 × 10 ⁶ Pa from the plunger while pushing from a nozzle having a diameter of 1 mm and a length of 1 mm, a curve between the plunger drop amount and temperature of the flow tester (softening flow curve) The temperature at which the gas first flows out is the melting start temperature, and the temperature for the drop amount of 5 mm is the softening point temperature.

[Toner Production Method]
Next, a toner manufacturing method according to the present invention will be described.

  The toner according to the present invention is composed of particles containing at least a resin and a colorant (hereinafter also referred to as colored particles). The colored particles constituting the toner according to the present invention are not particularly limited, and can be produced by a conventional toner production method. That is, a toner manufacturing method by a so-called pulverization method in which a toner is prepared through kneading, pulverization, and classification steps, or a so-called polymerized toner in which a polymerizable monomer is polymerized and at the same time particle formation is performed while controlling the shape and size. It can be produced by applying a production method (for example, an emulsion association method, suspension polymerization method, polyester elongation method, etc.). In the production method described above, an emulsion association method is preferred because it is easy to design a capsule structure that achieves both heat-resistant storage stability and low-temperature fixability of the toner.

  When the toner according to the present invention is produced by a pulverization method, it is preferable to produce the toner while maintaining the temperature of the kneaded material at 130 ° C. or lower. This is because when the temperature applied to the kneaded product exceeds 130 ° C., the colorant in the kneaded product may change in the agglomerated state due to the action of heat applied to the kneaded product, and the uniform aggregated state may not be maintained. Because. If variations occur in the aggregated state, the color tone of the produced toner varies, which may cause color turbidity.

  Next, the resin, wax and the like constituting the toner according to the present invention will be described with specific examples.

  First, the resin that can be used in the toner according to the present invention is not particularly limited, but a polymer formed by polymerizing a polymerizable monomer called a vinyl monomer described below is used. This is a typical example. The polymer constituting the resin that can be used in the present invention is a polymer obtained by polymerizing at least one polymerizable monomer, and these vinyl monomers are used alone. Or it is the polymer produced combining multiple types.

Specific examples of vinyl polymerizable monomers are shown below.
(1) Styrene or styrene derivatives Styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, α-methylstyrene, p-phenylstyrene, p-ethylstyrene, 2,4-dimethylstyrene, p-tert- Butyl styrene, pn-hexyl styrene, pn-octyl styrene, pn-nonyl styrene, pn-decyl styrene, pn-dodecyl styrene, etc. (2) Methacrylate derivatives Methyl methacrylate, methacryl Ethyl acetate, n-butyl methacrylate, isopropyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, n-octyl methacrylate, 2-ethylhexyl methacrylate, stearyl methacrylate, lauryl methacrylate, phenyl methacrylate, diethyl methacrylate (3) Acrylic acid ester derivatives Methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, t-butyl acrylate, isobutyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate, stearyl acrylate, lauryl acrylate, phenyl acrylate, etc. (4) Olefins Ethylene, propylene, isobutylene, etc. (5) Vinyl esters Vinyl propionate, vinyl acetate, vinyl benzoate, etc. (6) Vinyl ether (7) Vinyl ketones Vinyl methyl ketone, vinyl ethyl ketone, vinyl hexyl ketone, etc. (8) N-vinyl compounds N-vinyl carbazole, N-vinyl indole (9) Others Vinyl compounds such as vinyl naphthalene and vinyl pyridine, acrylic acid or methacrylic acid derivatives such as acrylonitrile, methacrylonitrile, acrylamide, etc. As the vinyl polymerizable monomer, those having an ionic dissociation group shown below can be used. Examples thereof include those having a functional group such as a carboxyl group, a sulfonic acid group, and a phosphoric acid group in the side chain of the monomer, and specific examples thereof include the following.

  First, those having a carboxyl group include acrylic acid, methacrylic acid, maleic acid, itaconic acid, cinnamic acid, fumaric acid, maleic acid monoalkyl ester, itaconic acid monoalkyl ester, and the like. Examples of those having a sulfonic acid group include styrene sulfonic acid, allyl sulfosuccinic acid, and 2-acrylamido-2-methylpropane sulfonic acid. Examples of those having a phosphoric acid group include acid phosphooxyethyl methacrylate. Is mentioned.

  Moreover, it is also possible to produce a resin having a crosslinked structure by using the following polyfunctional vinyls. Specific examples of polyfunctional vinyls are shown below.

Divinylbenzene, ethylene glycol dimethacrylate, ethylene glycol diacrylate, diethylene glycol dimethacrylate, diethylene glycol diacrylate, triethylene glycol dimethacrylate, triethylene glycol diacrylate, neopentyl glycol dimethacrylate, neopentyl glycol diacrylate, etc. Next, the present invention Examples of the wax that can be used for the toner according to the present invention include the following known waxes.
(1) Polyolefin wax Polyethylene wax, polypropylene wax, etc. (2) Long-chain hydrocarbon wax, paraffin wax, sazol wax, etc. (3) Dialkyl ketone wax, distearyl ketone, etc. (4) Ester wax Carnauba wax, Montan Wax, trimethylolpropane tribehenate, pentaerythritol tetramyristate, pentaerythritol tetrastearate, pentaerythritol tetrabehenate, pentaerythritol diacetate dibehenate, glycerol tribehenate, 1,18-octadecanediol di Stearate, Tristearyl trimellitic acid, Distearyl maleate, etc. (5) Amide wax Ethylene bisstearylamide, stearylamide stearate Melting point etc. wax is usually 40-125 ° C., preferably from 50 to 120 ° C., more preferably from 60 to 90 ° C.. By setting the melting point within the above range, the heat-resistant storage stability of the toner is ensured, and stable toner image formation can be performed without causing cold offset or the like even when fixing at a low temperature. Further, the wax content in the toner is preferably 1% by mass to 30% by mass, and more preferably 5% by mass to 20% by mass.

  Next, the toner according to the present invention is prepared by adding particles such as inorganic fine particles and organic fine particles having a number average primary particle size of 4 to 800 nm as external additives (= external additives) in the production process. Is possible.

[External additives and lubricants]
By adding the external additive, the fluidity and chargeability of the toner are improved, and the cleaning property is improved. The type of the external additive is not particularly limited, and examples thereof include the following inorganic fine particles, organic fine particles, and lubricants.

  As the inorganic fine particles, conventionally known fine particles can be used. For example, silica, titania, alumina, strontium titanate fine particles and the like are preferable. Moreover, what hydrophobized these inorganic fine particles as needed can also be used.

  Specific examples of the silica fine particles include commercially available products R-805, R-976, R-974, R-972, R-812, R-809 manufactured by Nippon Aerosil Co., Ltd., HVK-2150 manufactured by Hoechst, H -200, commercially available products TS-720, TS-530, TS-610, H-5, MS-5 and the like manufactured by Cabot Corporation.

  As the titania fine particles, for example, commercially available products T-805 and T-604 manufactured by Nippon Aerosil Co., Ltd., commercially available products MT-100S, MT-100B, MT-500BS, MT-600, MT-600SS, JA- 1. Commercial products TA-300SI, TA-500, TAF-130, TAF-510, TAF-510T manufactured by Fuji Titanium Co., Ltd. Commercial products IT-S, IT-OA, IT-OB, IT- manufactured by Idemitsu Kosan Co., Ltd. OC etc. are mentioned.

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

  As the organic fine particles, spherical organic fine particles having a number average primary particle diameter of about 10 to 2000 nm can be used. Specifically, homopolymers such as styrene and methyl methacrylate and copolymers thereof can be used.

  Further, a lubricant can be used to further improve the cleaning property and transfer property, and examples thereof include the following higher fatty acid metal salts. That is, salts of zinc stearate, aluminum, copper, magnesium, calcium, etc., zinc oleate, salts of manganese, iron, copper, magnesium, etc., zinc palmitate, salts of copper, magnesium, calcium, etc., linoleic acid And salts of zinc and calcium of ricinoleic acid.

  The addition amount of these external additives and lubricants is preferably 0.1 to 10.0% by mass with respect to the whole toner. Examples of methods for adding external additives and lubricants include methods using various known mixing devices such as a turbuler mixer, a Henschel mixer, a nauter mixer, and a V-type mixer.

[Developer according to the present invention]
The toner according to the present invention can be used as a two-component developer composed of a carrier and a toner, or as a non-magnetic one-component developer composed only of a toner.

  When the toner according to the present invention is used as a two-component developer, for example, a full-color print can be created at a high speed using a tandem image forming apparatus described later. In addition, by selecting a resin or a wax constituting the toner, it is possible to produce a full-color print compatible with so-called low-temperature fixing in which the paper temperature during fixing is about 100 ° C.

  In addition, carriers that are magnetic particles used when used as a two-component developer are conventionally known, for example, metals such as iron, ferrite, and magnetite, and alloys of these metals with metals such as aluminum and lead. It is possible to use materials. Among these, ferrite particles are preferable. The carrier has a volume average particle size of preferably 15 to 100 μm, more preferably 25 to 80 μm.

  When the toner is used as a non-magnetic one-component developer that forms an image without using a carrier, the toner is slid and pressed against the charging member and the developing roller surface during image formation. Image formation by the non-magnetic one-component development method can simplify the structure of the developing device, and thus has an advantage that the entire image forming device can be made compact. Therefore, by using the toner according to the present invention as a non-magnetic one-component developer, printing can be stably performed even when a compact color printer is provided in a severe high-temperature and high-humidity environment or a low-temperature and low-humidity environment. it can. For example, good print production can be performed in a limited space in a printing factory where the image forming environment is severe in terms of temperature and humidity.

(Image forming method)
Next, an image forming method using the toner according to the present invention will be described. First, an image forming method when the toner according to the present invention is used as a two-component developer will be described.

  FIG. 1 is a schematic view showing an example of an image forming apparatus that can be used when a toner according to the present invention is used as a two-component developer.

  In FIG. 1, 1Y, 1M, 1C and 1K are photoreceptors, 4Y, 4M, 4C and 4K are developing devices, 5Y, 5M, 5C and 5K are primary transfer rolls as primary transfer means, and 5A is a secondary transfer. Secondary transfer rolls as means, 6Y, 6M, 6C and 6K are cleaning devices, 7 is an intermediate transfer member unit, 24 is a heat roll type fixing device, and 70 is an intermediate transfer member.

  This image forming apparatus is called a tandem color image forming apparatus, and includes a plurality of sets of image forming units 10Y, 10M, 10C, and 10K, an endless belt-shaped intermediate transfer body unit 7 as a transfer unit, and a recording member P. An endless belt-shaped sheet feeding / conveying means 21 and a heat roll type fixing device 24 as a fixing means. A document image reading device SC is disposed on the upper part of the main body A of the image forming apparatus.

  As one of the different color toner images formed on each photoconductor, an image forming unit 10Y that forms a yellow image includes a drum-shaped photoconductor 1Y as a first photoconductor, and a periphery of the photoconductor 1Y. A charging unit 2Y, an exposure unit 3Y, a developing unit 4Y, a primary transfer roll 5Y as a primary transfer unit, and a cleaning unit 6Y. An image forming unit 10M that forms a magenta image as another different color toner image is disposed around a drum-shaped photoconductor 1M as a first photoconductor, and the photoconductor 1M. A charging unit 2M, an exposure unit 3M, a developing unit 4M, a primary transfer roll 5M as a primary transfer unit, and a cleaning unit 6M. In addition, an image forming unit 10C that forms a cyan image as one of other different color toner images is disposed around the photoconductor 1C as a drum-type photoconductor 1C as a first photoconductor. The charging unit 2C, the exposure unit 3C, the developing unit 4C, the primary transfer roll 5C as the primary transfer unit, and the cleaning unit 6C are provided. Further, an image forming unit 10K that forms a black image as one of other different color toner images is disposed around a drum-shaped photosensitive member 1K as a first photosensitive member, and the photosensitive member 1K. It has a charging means 2K, an exposure means 3K, a developing means 4K, a primary transfer roll 5K as a primary transfer means, and a cleaning means 6K.

  The endless belt-like intermediate transfer body unit 7 has an endless belt-like intermediate transfer body 70 as an intermediate transfer endless belt-like second image carrier that is wound around a plurality of rolls and is rotatably supported.

  Each color image formed by the image forming units 10Y, 10M, 10C, and 10K is sequentially transferred onto the rotating endless belt-shaped intermediate transfer body 70 by the primary transfer rolls 5Y, 5M, 5C, and 5K, and is combined. A colored image is formed. A recording member P such as a sheet as a transfer material accommodated in the sheet feeding cassette 20 is fed by the sheet feeding / conveying means 21, passes through a plurality of intermediate rolls 22 A, 22 B, 22 C, 22 D, and a registration roll 23, and is secondary. A color image is transferred onto the recording member P at a time by being conveyed to a secondary transfer roll 5A as a transfer means. The recording member P to which the color image has been transferred is fixed by the heat roll type fixing device 24, is sandwiched by the paper discharge roll 25, and is placed on the paper discharge tray 26 outside the apparatus.

  On the other hand, after the color image is transferred to the recording member P by the secondary transfer roll 5A, the residual toner is removed from the endless belt-shaped intermediate transfer body 70 from which the recording member P is separated by the curvature by the cleaning means 6A.

  During the image forming process, the primary transfer roll 5K is always in pressure contact with the photoreceptor 1K. The other primary transfer rolls 5Y, 5M, and 5C are in pressure contact with the corresponding photoreceptors 1Y, 1M, and 1C, respectively, only during color image formation.

  The secondary transfer roll 5A comes into pressure contact with the endless belt-shaped intermediate transfer body 70 only when the recording member P passes through the secondary transfer roll 5A and secondary transfer is performed.

  Further, the housing 8 can be pulled out from the apparatus main body A through the support rails 82L and 82R.

  The housing 8 includes image forming units 10Y, 10M, 10C, and 10K, and an endless belt-shaped intermediate transfer body unit 7.

  The image forming units 10Y, 10M, 10C, and 10K are arranged in tandem in the vertical direction. An endless belt-shaped intermediate transfer body unit 7 is disposed on the left side of the photoreceptors 1Y, 1M, 1C, and 1K in the figure. The endless belt-shaped intermediate transfer body unit 7 includes an endless belt-shaped intermediate transfer body 70 that can be rotated by winding rolls 71, 72, 73, 74, and 76, primary transfer rolls 5Y, 5M, 5C, and 5K, and a cleaning unit. 6A.

  The image forming units 10Y, 10M, 10C, and 10K and the endless belt-shaped intermediate transfer body unit 7 are integrally pulled out from the main body A by the drawer operation of the housing 8.

  In this way, toner images are formed on the photoreceptors 1Y, 1M, 1C, and 1K by charging, exposure, and development, and the toner images of the respective colors are superimposed on the endless belt-shaped intermediate transfer body 70, and are collectively applied to the recording member P. The image is transferred and fixed by the fixing device 24 by pressing and heating. The photoreceptors 1Y, 1M, 1C, and 1K after transferring the toner image to the recording member P are cleaned with the cleaning device 6A to remove the toner remaining on the photoreceptor, and then the above-described charging, exposure, and development cycle. The next image formation is performed.

  Next, an image forming method when the toner according to the present invention is used as a non-magnetic one-component developer will be described. FIG. 2 is an example of a full-color image forming apparatus that uses a non-magnetic one-component developer. An image forming apparatus 100 shown in FIG. 2 is a typical image forming apparatus in which the above-described developing device 20 can be mounted. 2 includes a charging brush 2 for uniformly charging the surface of a photosensitive drum 1 to a predetermined potential around a rotating electrostatic latent image carrier (hereinafter also referred to as a photosensitive drum) 1, and a photosensitive member. A cleaner 6 for removing residual toner on the drum 1 is provided.

  The laser scanning optical system 3 scans and exposes the photosensitive drum 1 uniformly charged by the charging brush 2 to form an electrostatic latent image on the photosensitive drum 1. The laser scanning optical system 3 includes a laser diode, a polygon mirror, and an fθ optical element, and print data for each of yellow, magenta, cyan, and black is transferred from the host computer to the control unit. Based on the print data for each color, a laser beam is sequentially output, and the photosensitive drum 1 is scanned and exposed to form an electrostatic latent image for each color.

  The developing device unit 40 that accommodates the developing device 4 supplies toner of each color to the photosensitive drum 1 on which the electrostatic latent image is formed to perform development. The developing device unit 40 is provided with four developing devices 4Y, 4M, 4C, and 4Bk each containing non-magnetic one-component toners of yellow, magenta, cyan, and black around the support shaft 33. Rotating to the center, each developing device 4 is guided to a position facing the photosensitive drum 1.

  The developing device unit 40 rotates around the support shaft 33 each time an electrostatic latent image of each color is formed on the photosensitive drum 1 by the laser scanning optical system 3, and stores the corresponding color toner. 4 is guided to a position facing the photosensitive drum 1. Then, each of the developing devices 4Y, 4M, 4C, and 4Bk sequentially supplies each charged color toner to the photosensitive drum 1 for development.

  In the image forming apparatus of FIG. 2, an endless intermediate transfer belt 7 is provided downstream of the developing device unit 40 in the rotation direction of the photosensitive drum 1, and is driven to rotate in synchronization with the photosensitive drum 1. The intermediate transfer belt 7 comes into contact with the photosensitive drum 1 at a portion pressed by the primary transfer roller 5 and transfers a toner image formed on the photosensitive drum 1. Further, a secondary transfer roller 73 is rotatably provided so as to face the support roller 72 that supports the intermediate transfer belt 7, and on the intermediate transfer belt 7 at a portion where the support roller 72 and the secondary transfer roller 73 face each other. The toner image is pressed and transferred onto a recording material P such as recording paper.

  A cleaner 8 for removing residual toner on the intermediate transfer belt 7 is provided between the full-color developing device unit 40 and the intermediate transfer belt 7 so as to be able to contact with and separate from the intermediate transfer belt 7.

  A paper feeding means 60 that guides the recording member P to the intermediate transfer belt 7 includes a paper feeding tray 61 that houses the recording material P, and a paper feeding roller 62 that feeds the recording material P stored in the paper feeding tray 61 one by one. It is composed of a timing roller 63 for feeding the fed recording material P to the secondary transfer site.

  The recording member P to which the toner image has been pressed and transferred is conveyed to the fixing device 24 by a conveying means 66 constituted by an air suction belt or the like, and the toner image transferred by the fixing device 24 is fixed on the recording material P. After fixing, the recording material P is transported through the vertical transport path 80 and discharged onto the upper surface of the apparatus main body 100.

  The image forming apparatus shown in FIG. 2 is one in which a replaceable developing device 4 is loaded to form an image. The developing device 4 shown in FIG. 3A is usually called a toner cartridge, and stores a predetermined amount of toner inside a part where components such as a developing roller are arranged. The developing device supplied in the form of a toner cartridge is loaded at a predetermined position in the image forming apparatus, and then the developer stored therein is supplied to the photosensitive drum for development, and a predetermined number of images are formed and developed. When the agent runs out, it is removed from the apparatus and a new toner cartridge is loaded.

  FIG. 3B is a schematic diagram illustrating an example of a cross-sectional configuration of the developing device 4. Hereinafter, the developing device 4 is also referred to as a toner cartridge 4. The toner cartridge 4 has a buffer chamber 42 adjacent to the developing roller 41 and a hopper 43 adjacent to the buffer chamber 42.

  The developing roller 41 has a conductive cylindrical base and an elastic layer formed on the outer periphery of the base using a material having high hardness such as silicone rubber.

  In the buffer chamber 42, a blade 44, which is a toner regulating member, is disposed in pressure contact with the developing roller 41. The blade 44 regulates the charge amount and adhesion amount of toner on the developing roller 41. It is also possible to further provide an auxiliary blade 45 for assisting regulation of the toner charge amount and adhesion amount on the developing roller 41 on the downstream side of the blade 41 with respect to the rotation direction of the developing roller 41.

  A supply roller 46 is pressed against the developing roller 41. The supply roller 46 is driven to rotate in the same direction as the developing roller 41 (counterclockwise direction in the drawing) by a motor (not shown). The supply roller 46 has a conductive cylindrical substrate and a foam layer formed of urethane foam or the like on the outer periphery of the substrate.

  The hopper 43 contains toner T as a one-component developer. The hopper 43 is provided with a rotating body 47 for stirring the toner. A film-like conveying blade is attached to the rotating body 47, and the toner is conveyed by the rotation of the rotating body 47 in the arrow direction. The toner conveyed by the conveying blades is supplied to the buffer chamber 42 through a passage 44 provided in a partition wall that separates the hopper 43 and the buffer chamber 42. The shape of the conveying blade is bent while conveying the toner in front of the rotation direction of the blade as the rotating body 47 rotates, and returns to a straight state when the left end of the passage 48 is reached. In this way, the blades return the toner to the passage 48 by returning the shape straight after passing through the curved state.

  The passage 48 is provided with a valve 321 for closing the passage 48. This valve is a film-like member, one end of which is fixed to the upper right side surface of the passageway 48 of the partition wall. When toner is supplied from the hopper 43 to the passageway 48, the passageway 48 is opened by being pushed rightward by the pressing force from the toner. It is like that. As a result, toner is supplied into the buffer chamber 42.

  Further, a regulating member 322 is attached to the other end of the valve 321. The regulating member 322 and the supply roller 46 are arranged so as to form a slight gap even when the valve 321 closes the passage 48. The regulating member 322 adjusts so that the amount of toner accumulated at the bottom of the buffer chamber 42 does not become excessive, so that a large amount of toner collected from the developing roller 41 to the supply roller 46 does not fall to the bottom of the buffer chamber 42. Adjusted.

  In the toner cartridge 4, the developing roller 41 is rotated in the direction of the arrow during image formation, and the toner in the buffer chamber 42 is supplied onto the developing roller 41 by the rotation of the supply roller 46. The toner supplied onto the developing roller 41 is charged and thinned by a blade 44 and an auxiliary blade 45 and then transported to a region facing the image carrier to develop an electrostatic latent image on the image carrier. Provided. The toner that has not been used for development returns to the buffer chamber 42 as the developing roller 41 rotates, and is scraped and collected from the developing roller 41 by the supply roller 46.

  The toner according to the present invention does not change the crystal structure of the colorant in the toner at the heating temperature at the time of fixing in the prior art, and a toner image having stable color reproducibility can be obtained with a known fixing device. can get. By the way, in recent years, there is a movement to reduce the energy consumption of the image forming apparatus from the viewpoint of consideration for the global environment. Of these, the reduction of energy consumption in the fixing process has attracted attention, and so-called low-temperature fixing technology for fixing a toner image at a temperature lower than the current fixing temperature has been adopted.

  That is, when the toner according to the present invention is a toner compatible with low-temperature fixing, the surface temperature of the heating member in the fixing device is preferably set to less than 140 ° C., and the surface temperature of the heating member is set to less than 130 ° C. Is more preferable.

  Under the set temperature, it is required to efficiently supply heat supplied from the heating member to the transfer sheet, and so-called belt fixing using a heat-resistant belt as either the heating member or the pressure member. The method is preferred.

The present invention will be further described with reference to typical embodiments thereof. However, embodiments of the present invention are not limited thereby. In the text, “part” means “part by mass”.
[Production of Cyan Toners 1 to 12 and Comparative Toners 13 to 16]
1-1. Preparation of Cyan Toner 1 (Toner by Kneading / Crushing Method) The following toner components were charged into a Henschel mixer (manufactured by Mitsui Miike Mining Co., Ltd.), and the peripheral speed of the stirring blade was set to 25 m / second and mixed for 5 minutes.

100 parts by mass of polyester resin (bisphenol A-ethylene oxide adduct, terephthalic acid, trimellitic acid condensate weight average molecular weight 20,000)
Colorant I-1 4 parts by weight Release agent (pentaerythritol tetrastearate) 6 parts by weight Charge control agent (boron dibenzylate) 1 part by weight The mixture is kneaded with a twin-screw extruder kneader and then coarsely pulverized with a hammer mill After that, a pulverization process was performed with a turbo mill pulverizer (manufactured by Turbo Kogyo Co., Ltd.), and further a fine powder classification process was performed with an airflow classifier utilizing the Coanda effect, thereby obtaining colored particles having a volume-based median diameter of 5.5 μm. .

  Next, the following external additives were added to the colored particles, and external addition processing was performed with a Henschel mixer (manufactured by Mitsui Miike Mining Co., Ltd.) to prepare “Toner 1”.

Hexamethylsilazane-treated silica (average primary particle size 12 nm) 0.6 parts by mass n-octylsilane-treated titanium dioxide (average primary particle size 24 nm)
0.8 parts by mass The external addition treatment by the Henschel mixer was performed under the conditions of a peripheral speed of the stirring blade of 35 m / second, a treatment temperature of 35 ° C., and a treatment time of 15 minutes.
1-2. Preparation of Toners 2 to 12 and Comparative Toners 13 to 16 (1) Preparation of “Colorant Fine Particle Dispersion 2” 11.5 parts by mass of sodium n-dodecyl sulfate was added to 160 parts by mass of ion-exchanged water, and dissolved and stirred. Thus, an aqueous surfactant solution was prepared. In this surfactant aqueous solution, 6 parts by mass of “I-1” shown in Table 1 is gradually added, and dispersion treatment is performed using “Clearmix W Motion CLM-0.8 (manufactured by M Technique Co., Ltd.)”. Thus, “Colorant fine particle dispersion 2” was prepared.

  “Colorant fine particle 2” in “Colorant fine particle dispersion 2” had a volume-based median diameter of 98 nm. The volume-based median diameter was measured using “MICROTRAC UPA-150 (manufactured by HONEYWELL)” under the following measurement conditions.

Sample refractive index 1.59
Sample specific gravity 1.05 (in terms of spherical particles)
Solvent refractive index 1.33
Solvent viscosity 0.797 (30 ° C), 1.002 (20 ° C)
0-point adjustment Ion-exchanged water was added to the measurement cell for preparation.
(2) Preparation of “Colorant Fine Particle Dispersion 3-12 and Comparative Colorant Fine Particle Dispersion 13-15” 11.5 parts by mass of sodium n-dodecyl sulfate was added to 160 parts by mass of ion-exchanged water, and dissolved and stirred. Thus, an aqueous surfactant solution was prepared. In this surfactant aqueous solution, 6 parts by mass of “I-2 to I-12” shown in Table 1 are gradually added, and “Clearmix W Motion CLM-0.8 (M Technique Co., Ltd.)” is used. Dispersion treatment was performed to prepare “colorant fine particle dispersions 2 to 12”. In the same manner, 6 parts by mass of “Comparison I-13 to I-15” shown in Table 1 are gradually added and dispersed using “Clearmix W Motion CLM-0.8 (manufactured by M Technique Co., Ltd.)”. Then, “Comparison Colorant Fine Particle Dispersions 13 to 15” were prepared.
(3) Preparation of “Colorant Fine Particle Dispersion 16” 6 parts by mass of “I-2” was added to C.I. i. “Comparative colorant fine particle dispersion 16” was prepared in the same manner except that Pigment Blue 15: 3 was changed to 6 parts by mass.
[Preparation Example 1 of Resin Particles for Forming Toner Particle Core]
1) First stage polymerization (formation of core particles):
Surface activity obtained by dissolving 4 parts by mass of an anionic surfactant represented by the following formula (P) in 3040 parts by mass of ion-exchanged water in a 5 L reaction vessel equipped with a stirrer, a temperature sensor, a cooling pipe, and a nitrogen introducing device. The agent solution was charged, and the internal temperature was raised to 80 ° C. while stirring at a stirring speed of 230 rpm under a nitrogen stream.

To this surfactant solution, an initiator solution in which 10 parts by mass of a polymerization initiator (potassium persulfate; KPS) was dissolved in 400 parts by mass of ion-exchanged water was added to a temperature of 75 ° C., and then 532 parts by mass of styrene. A monomer mixture consisting of 200 parts by mass of n-butyl acrylate, 68 parts by mass of methacrylic acid, and 16.4 parts by mass of n-octyl mercaptan was added dropwise over 1 hour, and the system was heated at 75 ° C. for 2 hours. Then, polymerization (first stage polymerization) was carried out by stirring to prepare latex [A1] which is a dispersion of core particles. The weight average molecular weight (Mw) of the core particles in this latex [A1] was 16,500.
Formula (P): C ₁₀ H ₂₁ (OCH ₂ CH ₂ ) ₂ SO ₃ Na
2) Second stage polymerization (formation of intermediate layer):
In a flask equipped with a stirrer, a monomer mixture comprising 101.1 parts by mass of styrene, 62.2 parts by mass of n-butyl acrylate, 12.3 parts by mass of methacrylic acid, and 1.75 parts by mass of n-octyl mercaptan As a release agent, 93.8 parts by mass of paraffin wax “HNP-57” (manufactured by Nippon Seiwa Co., Ltd.) was added, and the mixture was heated to 80 ° C. and dissolved to prepare a monomer solution.

  On the other hand, a surfactant solution in which 3 parts by mass of the anionic surfactant represented by the above formula 1 is dissolved in 1560 parts by mass of ion-exchanged water is heated to 80 ° C., and the above-mentioned latex [ After adding 32.8 parts by mass of A1] in terms of solid content, the monomer solution of the release agent was mixed and dispersed for 8 hours by a mechanical disperser “CLEAMIX” (manufactured by M Technique Co., Ltd.) having a circulation path. A dispersion (emulsion) containing emulsified particles (oil droplets) having a dispersed particle diameter of 340 nm was prepared.

Next, an initiator solution in which 6 parts by mass of a polymerization initiator (KPS) is dissolved in 200 parts by mass of ion-exchanged water is added to this dispersion, and this system is heated and stirred at 80 ° C. for 3 hours. Polymerization (second stage polymerization) was performed to prepare latex [A2]. The latex [A2] had a weight average molecular weight (Mw) of 23,000.
3) Third stage polymerization (formation of outer layer):
An initiator solution prepared by dissolving 5.45 parts by mass of a polymerization initiator (KPS) in 220 parts by mass of ion-exchanged water is added to the resin particles [A2] obtained as described above, and the temperature condition is 80 ° C. A monomer mixed solution composed of 293.8 parts by mass of styrene, 154.1 parts by mass of n-butyl acrylate, and 7.08 parts by mass of n-octyl mercaptan was fully consumed over 1 hour. After completion of the dropwise addition, polymerization (third stage polymerization) is performed by heating and stirring for 2 hours, followed by cooling to 28 ° C. and dispersion of the core-forming resin particles [A] composed of composite resin particles having a multilayer structure A liquid latex [A3] was obtained. The core-forming resin particles [A] had a weight average molecular weight (Mw) of 26,800. The mass average particle diameter of the composite resin particles constituting the core-forming resin particles [A] was 125 nm. The core-forming resin particles [A] had a glass transition temperature (Tg) of 28.1 ° C.
[Preparation Example 1 of Resin Particles for Forming Shell]
In Preparation Example 1 of the core-forming resin particles, the monomer mixture used for the first stage polymerization (nucleation particle formation) was 624 parts by mass of styrene, 120 parts by mass of 2-ethylhexyl acrylate, 56 parts by mass of methacrylic acid, A latex of shell-forming resin particles [F] was prepared in the same manner except that the composition was changed to 16.4 parts by mass of n-octyl mercaptan. The shell-forming resin particles [F] had a weight average molecular weight (Mw) of 16,400. The mass average particle diameter of the composite resin particles constituting the shell-forming resin particles [F] was 95 nm. The shell-forming resin particles [F] had a glass transition temperature (Tg) of 62.6 ° C.

[Cyan toner production example 2]
1) Formation of core particles:
420.7 parts by mass of latex [A3] of the above resin particles for core formation [A] in terms of solid content, 900 parts by mass of ion-exchanged water, and 200 parts by mass of cyan colorant fine particle dispersion [1], The mixture was stirred in a reaction vessel equipped with a temperature sensor, a condenser, a nitrogen introducing device, and a stirring device. After adjusting the temperature in the container to 30 ° C., 5 mol / L sodium hydroxide aqueous solution was added to this solution to adjust the pH to 10.

Next, an aqueous solution obtained by dissolving 2 parts by mass of magnesium chloride hexahydrate in 1000 parts by mass of ion-exchanged water was added over 10 minutes at 30 ° C. with stirring. After standing for 3 minutes, the temperature was raised and the system was heated to 65 ° C. over 60 minutes. In this state, the particle size of the associated particles was measured with “Coulter Multiside-3” (manufactured by Beckman Coulter, Inc.), and when the volume-based median diameter became 5.5 μm, 40.2 parts by mass of sodium chloride An aqueous solution in which 1000 parts by mass of ion-exchanged water is dissolved is added to stop the growth of the particle size, and further, the fusion is continued by heating and stirring at a liquid temperature of 70 ° C. for 1 hour as an aging treatment. Formed. When the circularity of the core particle 1 was measured by “FPIA2100” (manufactured by Systex), the average value was 0.962.
2) Formation of shell layer:
Next, 96 parts by mass of a latex of resin particles [F] for shell formation was added at 65 ° C., and an aqueous solution obtained by dissolving 2 parts by mass of magnesium chloride hexahydrate in 1000 parts by mass of ion-exchanged water was added over 10 minutes. After the addition, the temperature was raised to 70 ° C. (shelling temperature), stirring was continued for 1 hour, and the shell-forming resin particles [F] were fused to the surface of the core particles 1. A ripening treatment was performed to form a shell layer.

Here, 40.2 parts by mass of sodium chloride was added, the mixture was cooled to 30 ° C. at 6 ° C./min, the produced fused particles were filtered, washed repeatedly with ion-exchanged water at 45 ° C., and then 40 ° C. By drying with warm air, a cyan toner 2 having a shell layer formed on the surface of the core particles was produced. Table 1 shows the structure of the cyan colorant used in the cyan toner 2.
[Cyan toner preparation examples 3 to 12, comparative cyan toner preparation examples 13 to 16]
Similarly, in the cyan toner production example 2, the cyan colorant fine particle dispersion [2] was changed to the cyan colorant fine particle dispersion 3, and the cyan toners 3 to 12 and the comparative cyan toner were used in the combinations shown in Table 1. 13-16 were produced.

[Production of yellow toner]
(Preparation Example 1 of Yellow Colorant Fine Particle Dispersion)
Stirring and dissolving 11.5 parts by mass of sodium n-dodecyl sulfate in 160 parts by mass of ion-exchanged water; I. Pigment Yellow 65; 17.5 parts by mass and C.I. I. Pigment Yellow 83; 7.5 parts by mass are gradually added, respectively, and then dispersed using “Clearmix W Motion CLM-0.8” (manufactured by M Technique Co., Ltd.), and the volume-based median diameter is 126 nm. A colorant fine particle dispersion [1] containing yellow colorant fine particles [1] was obtained.

The volume-based median diameter was measured with “MICROTRAC UPA 150” (manufactured by HONEYWELL) under the following measurement conditions.
[Measurement condition]
Sample refractive index: 1.59
Sample specific gravity: 1.05 (in terms of spherical particles)
Solvent refractive index: 1.33
Solvent viscosity: 0.797 at 30 ° C, 1.002 at 20 ° C
-Ion exchange water was put into the measurement cell and zero point adjustment was performed.
[Preparation of Yellow Toner 1]
Yellow toner 1 was prepared in the same manner as in cyan toner preparation example 2, except that cyan colorant fine particle dispersion [2] was changed to yellow colorant fine particle dispersion 1.
[Production of magenta toner]
(Preparation Example 1 of Magenta Colorant Fine Particle Dispersion)
Stirring and dissolving 11.5 parts by mass of sodium n-dodecyl sulfate in 160 parts by mass of ion-exchanged water; I. Solvent Red 49; 9 parts by mass are gradually added, and then dispersed using “Clearmix W Motion CLM-0.8” (manufactured by M Technique Co., Ltd.), and the volume-based median diameter is 66 nm. Colorant fine particle dispersion 1 containing colorant fine particles 1 was obtained.

The volume-based median diameter was measured with “MICROTRAC UPA 150” (manufactured by HONEYWELL) under the following measurement conditions.
[Preparation of Magenta Toner 1]
Magenta toner 1 was prepared in the same manner as in cyan toner production example 2, except that cyan colorant fine particle dispersion 2 was changed to magenta colorant fine particle dispersion 1.
(Preparation of developer)
Each of the above cyan toners 1 to 12, comparative cyan toners 13 to 16, yellow toner 1 and magenta toner 1 is coated with a silicone resin-coated ferrite carrier having a volume average particle diameter of 50 μm, and the toner concentration is 6% by mass. Cyan developers 1 to 12, which are two-component developers, comparative cyan developers 13 to 16, yellow developer 1, and magenta developer 1 were prepared.

[Examples 1-12, Comparative Examples 13-16]
For this cyan developer 1-12 and comparative cyan developer 13-16, a commercially available full color high-speed multifunction machine bizhub PRO C6500 (manufactured by Konica Minolta Business Technologies), fixing line speed of 620 mm / min (about 130 sheets / min) The print image forming operation was performed under the conditions set in (1) to (3), and the following (1) to (3) were evaluated.

As the transfer paper, POD gloss coated paper 128 g / m ² (manufactured by Oji Paper Co., Ltd.) was used.
The results are shown in Table 2.
〔Evaluation item〕
(1) Glossiness and gloss unevenness Fixing was performed at a surface temperature of the fixing roll of 190 ° C., and the glossiness of the image area was measured. The toner adhesion amount was measured at 0.4 mg / cm ² . Further, the uneven glossiness in the fixed image was visually evaluated. The glossiness was measured as a glossiness at an angle of 60 degrees according to JIS Z8741: 97 with a glossmeter (GM-26D, manufactured by Murakami Color Research Laboratory) for the solid fixed image.

A glossiness of 50 to 70 is considered good.
(2) Offset property at the time of high-speed fixing 500 sheets of a 1 mm square pattern was continuously printed on the leading edge of an A3 size transfer paper 100 mm, and the subsequent image rear part was printed as a non-image. The evaluation criteria were as follows. The fixing member was evaluated without contacting any cleaning member.

[Evaluation criteria]
Excellent: No offset is detected in all images.
Practical use: 1 to 5 out of 500 sheets, a slight offset such that a grid pattern cannot be recognized is confirmed with a 10 times magnifier.
Defective: Less than 60 people evaluated the graph paper as “reproduced” (defective)
(3) Color evaluation of green logo mark Randomly extracted from companies, local governments, and public institutions that use green (yellowish green to blue green) logo marks as green color reproducibility evaluation methods. The logos of the 50 organizations are displayed on the computer displays detailed below from each company's website, printed on the transfer paper “Washi Copy Daio” (manufactured by Ozu Sangyo), and extracted at random. Evaluation was made according to the following criteria according to the number of people who evaluated that “the logo mark color of the company on the display was reproduced on the transfer paper without a sense of incompatibility” out of 100 panelists in the 70s.

[Evaluation criteria]
Excellent: More than 90 people evaluated as “reproduced” (excellent)
Good: 80 or more and less than 90 people evaluated as “reproduced” (good)
Practical use: 60 or more and less than 80 people evaluated as “reproduced” (practical)
Defect: Less than 60 people evaluated as "reproduced" (defect)
〔Computer〕
・ IMac (Apple Computer Co., Ltd.)
・ 24 inch wide screen LCD
・ Resolution 1920 × 1200 pixels ・ 2.16 GHz Intel Core 2 Duo processor 1
・ 4MB shared L2 cache ・ 1GB memory (2 × 512MB SO-DIMM)
・ 250GB serial ATA hard drive 2
・ 8x double layer SuperDrive (DVD + R DL, DVD ± RW, CD-RW)
・ NVIDIA GeForce 7300 GT 128MB GDDR3 memory ・ AirMac Extreme and Bluetooth 2.0 built-in ・ Apple Remote

  It can be seen that Examples 1 to 12 in the present invention are good in any characteristics, but Comparative Examples 13 to 16 outside the present invention have problems in any characteristics at least.

1 is a schematic diagram illustrating an example of a tandem full-color image forming apparatus capable of two-component development type image formation. 1 is a schematic view of a 4-cycle full-color image forming apparatus capable of image formation by a non-magnetic one-component development system. FIG. 2 is a schematic diagram illustrating an example of a developing device (toner cartridge).

Explanation of symbols

1 Photoconductor (Photoconductor drum)
4Y, 4M, 4C, 4Bk (4K) Development device (toner cartridge)
6, 6Y, 6M, 6C, 6K Cleaning device 70 Intermediate transfer member 10Y, 10M, 10C, 10K Image forming unit 24 Fixing device P Transfer material (recording material)

Claims (4)

An electrostatic latent image developing toner comprising at least a resin and a colorant, wherein the colorant comprises only a compound represented by the following general formula (I):

(In the formula, M ₁ represents a metal atom of any _one of a silicon atom, a germanium atom and a tin atom. Z represents an alkoxy group having 9 to 18 carbon atoms and a substituent having 9 to 18 carbon atoms. .A ^1, a ^2, a ³ and a ^4, which also shows an aryloxy group, a has represents an atomic group shown below.)
2. The electrostatic latent image developing toner according to claim 1, wherein M ₁ is a silicon atom.   3. The electrostatic latent image developing toner according to claim 1, wherein each Z is independently an alkoxy group having 9 to 18 carbon atoms. An image forming method comprising forming an image using the electrostatic latent image developing toner according to claim 1.