JP3500755B2 - Toner composition for developing electrostatic images and image forming method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic charge image developing toner used for developing an electrostatic latent image in an electrostatic recording method or an electrophotographic method, and an image forming method using the toner.

[0002]

2. Description of the Related Art In electrophotography, an electrostatic latent image formed on a photoconductor or the like is developed with a developer, the toner image on the photoconductor is transferred to a transfer medium such as paper or sheet, and then the image is heated. The toner is fixed by using pressure, solvent and the like to obtain a permanent image, and the toner remaining on the photoconductor at that time is removed from the photoconductor by a cleaning device. Therefore, in order for the electrophotographic method to be completed as a system having stable repeating characteristics, it is necessary that each process for forming an image be fully functional. In each of these processes, when the photoconductor and the cleaning member are in direct contact with each other in the cleaning process, damage to the photoconductor surface such as scratches and abrasion, filming, etc., and image defects due to poor cleaning may occur. There is. Therefore, a high cleaning property is required in the cleaning process. Also,
In recent years, the use of recycled paper is increasing to save resources. Generally, recycled paper generates a large amount of paper dust, so paper dust and the like enter between the photoconductor and the cleaning member, causing black stripes and the like. There is a problem that induces poor cleaning,
Higher cleaning performance is required.

Conventionally, it has been proposed to externally add various additives to toner particles in order to improve fluidity, durability, or cleaning property. For example, it has been proposed to obtain a toner by adding fine powder of an inorganic compound such as silica, alumina or titania (Japanese Patent Laid-Open No. 59-226).
355, JP 61-23160, JP 63-118757, JP 2-1870, JP 2-90175, etc.). However,
When silica, alumina, fine powder of an inorganic compound such as titania is added, the fluidity of the toner is remarkably improved, but since the hardness of these fine powders is high, a dent or a scratch is easily formed on the surface of the photoreceptor, Further, there is a problem that the toner is likely to adhere to the damaged portion.

In order to solve these problems, a method of externally adding a fatty acid metal salt, polyolefin or the like as an additive to the toner particles has been studied (Japanese Patent Laid-Open No. 54-16219).
JP, JP-A-60-198556, JP, JP-A-61
-231562, JP-A-61-231563, etc.). However, all of the fatty acid metal salts and polyolefins disclosed in the above publications, even if effective at the beginning of addition, have the property that the additives themselves are easily filmed on the photoconductor, and therefore, they are repeatedly used. During cleaning, due to pressure between the photoconductor and the cleaning member, non-uniform filming occurs on the photoconductor surface,
There is a problem in that the density of the photosensitive member is lowered, the fog is generated, and the image becomes white and blurred. On the other hand, it has been studied to coat the toner surface with resin fine powder of a homopolymer or a copolymer of acrylic acid ester monomer, methacrylic acid ester monomer, styrene-based monomer and the like (Japanese Patent Publication No. 2-3188). Although addition of these resin fine powders to the toner is one effective means for improving the cleaning property, recently, the copying speed of a copying machine or a printer tends to be higher. Along with this, stress (load, speed) applied to the photoconductor at the time of cleaning also increases, so that the resin fine powder is deformed on the surface of the photoconductor, causing a problem such as filming.

Further, in order to reduce the stress at the time of cleaning, a method of externally adding silicon resin fine particles to toner particles has been studied (Japanese Patent Laid-Open No. 64-49052).
Japanese Patent Application Laid-Open No. 1-106073, Japanese Patent Application Laid-Open No. 1-260
93354, Japanese Patent Laid-Open No. 2-55367, etc.).
Addition of silicone resin fine particles to the toner is an effective means for improving the cleaning property, and cleaning failure or
This has the effect of reducing toner adhesion to the photoreceptor. However, the silicon resin fine particles have a smaller effect than the inorganic compound fine powder described above, but also have an effect as an abrasive. Therefore, if the surface of the photoconductor is repeatedly cleaned at high speed, the photoconductor is worn or the photoconductor is abraded. There is a problem of being hurt. On the other hand, in recent years, in consideration of the office environment, a charging method using a conventional corotron, a charging roller that hardly generates ozone, which is an alternative to a transfer method, and a method using a transfer roller have been devised and put into practical use. However, when the image is transferred by the transfer roller, a defect such that a part of the image portion is not transferred and is missing easily occurs, and this tendency is particularly remarkable when the transfer body is an OHP sheet. To solve this problem, in the toner particles,
A method of adding an inorganic oxide treated with silicone oil has been proposed. However, in order to solve the above problem, it is necessary to add a large amount to the toner. Therefore, the external additive is easily detached from the toner, and the hardness of these fine powders is high. There is a problem in that the film quality appears, the surface of the photoconductor is scratched, the outermost surface layer is abraded, and the like, which results in an image quality defect.

[0006]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above-mentioned problems in the prior art. An object of the present invention is to develop an electrostatic charge image having stable repetitive characteristics without damaging the surface of the photoconductor or the dielectric in the cleaning step, causing no filming phenomenon on the surface of the photoconductor or the cleaning member. To provide toner for use. Another object of the present invention is to provide an image forming method capable of forming a highly reliable image for a long period of time without causing image troubles such as whitening, fog, density reduction, image blurring, and black streaks.
Another object of the present invention is to provide an electrostatic charge image developing toner which improves transfer efficiency even when transferred by a transfer roller to which a bias is applied and which does not cause image defects regardless of the type of transfer body. It is in.

[0007]

The toner for developing an electrostatic charge image of the present invention comprises toner particles containing a binder resin and a colorant,
It is characterized in that spherical silicone fine particles having a rubber hardness of 10 to 70 which are surface-treated with oil are added. The image forming method of the present invention comprises a step of forming a latent image on a latent image carrier whose outermost surface layer is made of an organic material, a step of developing the latent image with a developer, and a step of transferring the formed toner image. In the image forming method, which comprises a step of transferring the toner onto the body and a step of removing the residual toner on the latent image holding body, and the transferring step is a pressure-contact transfer by a transfer roller to which a bias is applied, the electrostatic image development described above as a developer. It is characterized in that the toner is used for transfer, and the transfer is performed by pressure contact transfer from the back surface of the transfer body using a bias roller.

The present invention will be described in detail below. As the toner particles used in the present invention, conventionally known toner particles composed of a binder resin and a colorant are used. Typical examples of the binder resin used include styrenes such as styrene and chlorostyrene, monoolefins such as ethylene, propylene, butylene and isoprene, vinyl acetate, vinyl propionate, vinyl benzoate and vinyl acetate. Α-Methylene aliphatic monoesters such as vinyl ester, methyl acrylate, ethyl acrylate, butyl acrylate, dodecyl acrylate, octyl acrylate, phenyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, dodecyl methacrylate. Examples thereof include carboxylic acid esters, vinyl ethers such as vinyl methyl ether, vinyl ethyl ether and vinyl butyl ether, and homopolymers or copolymers of vinyl ketones such as vinyl methyl ketone and vinyl hexyl ketone. Particularly typical binder resins include polystyrene, styrene-alkyl acrylate copolymer, styrene-alkyl methacrylate copolymer, styrene-acrylonitrile copolymer, polyethylene, polypropylene and the like. further,
Other examples include polyester, polyurethane, epoxy resin, and silicone resin. Among these, styrene resin and polyester resin are particularly preferably used.

Typical colorants used include carbon black, aniline blue, calcoil blue, chrome yellow, DuPont oil red, quinoline yellow, phthalocyanine blue, rose bengal, C.I. I. Pigment Red 48: 1, C.I. I. Pigment Red 122, C.I. I. Pigment Red 57:
1, C.I. I. Pigment Yellow 97, C.I. I. Pigment Yellow 12, C.I. I. Pigment Blue 15:
1, C.I. I. Pigment Blue 15: 3 and the like.

A charge control agent may be added to the toner particles if necessary. As the charge control agent, known compounds can be used, but it is preferable to use an azo metal complex, a salicylic acid metal complex, nigrosine or a quaternary ammonium salt. Further, other known components such as low molecular weight polypropylene, low molecular weight polyethylene, offset preventing agents such as wax, polyvinylidene fluoride fine particles, polystyrene fine particles, polymethylmethacrylate fine particles and the like can be added. Further, the toner particles in the present invention may be a magnetic toner containing a magnetic material or a capsule toner. The average particle size of the toner particles is 3 μm to 20 μm.
The range of m is preferable. Further, in order to improve the fluidity of the toner, silica (SiO ₂ ), titanium oxide (T
Inorganic oxides such as io ₂ ) and alumina (Al ₂ O ₃ ) or their surfaces are used in combination with silane coupling agents, titanium coupling agents, other resins, or fine particles treated with the above charge control agents. It can be added.

[0011]

[0012] sphere-like silicone over Ngomu particles that will be externally added to the toner particles of the present invention have the general formula _{- (R 2 SiO) n -} ( wherein, R is a methyl group, an ethyl group, an alkyl group such as propyl Represents an organic group selected from aryl groups such as phenyl group and tolyl group, and halogenated alkyl groups such as chloromethyl group.). The preparation of silicone over <br/> Ngomu microparticles The spherical,

[Chemical 1] The ones given by The molecular structure of the silicone over Ngomu may be a branched even linear, or even those of the mixed state.

[0013] approximately spherical silica <br/> co over Ngomu fine particles used in the present invention must be 70 to rubber hardness no 10, preferably in the range of 20 to 50. If the rubber hardness is less than 10, it tends to agglomerate silicone over Ngomu fine particles, cleaning property becomes insufficient. On the other hand, when it is larger than 70, the surface of the photoconductor is easily scratched. In the present invention, the rubber hardness means a rubber hardness measured by an A-type hardness tester according to JIS K6301. Its average particle size
In the range of 0.05 to 5 μm, preferably 0.1
Those having a range of ˜2 μm are used.

The surface treatment with oil is untreated fine particles.
Was dispersed and mixed in an oil dissolved in alcohol.
After that, the solvent alcohol was distilled off using an evaporator,
It can be performed by a method such as drying. Above
Examples of the oil used for the surface treatment of the spherical silicone rubber fine particles include dimethyl silicone oil, methylphenyl silicone oil, amino group-containing silicone oil, fluorine-modified silicone oil, epoxy-modified silicone oil, mercapto-modified silicone oil, and the like. The amount of oil used for processing is spherical silicone
It is in the range of 5 to 40% by weight, preferably 10 to 30% by weight, based on the rubber fine particles. This process is 5
When it is less than 40% by weight, the sufficient effect of the treatment cannot be obtained, and when it is more than 40% by weight, the rubber fine particles are likely to be aggregated to lower the fluidity of the toner. The oil-treated spherical silicone rubber fine particles are preferably added in the range of 0.1 to 3 parts by weight with respect to 100 parts by weight of the toner particles.

Next, the image forming method of the present invention will be described. An electrophotographic photosensitive member and a dielectric are used as the latent image holding member whose outermost surface layer used in the step of forming a latent image is made of an organic material. As the electrophotographic photosensitive member, the outermost surface layer is made of an organic photosensitive layer in which a photoconductive material is dispersed in a binder resin, a protective layer made of a synthetic resin, etc.
Known ones are used. Specific examples include a charge transport layer in which a charge transport agent is dispersed in a polycarbonate resin. As the dielectric whose outermost layer is made of an organic material, one having a dielectric layer made of a synthetic resin such as polyester or polycarbonate resin on a substrate is used. The latent image can be formed by a conventional method. For example, in the case of an electrophotographic photoreceptor, it can be uniformly charged by a corona charger or a bias roller and imagewise exposed. The latent image thus formed is developed using the above-mentioned toner for developing an electrostatic charge image. The toner for developing an electrostatic charge image may be used as either a one-component developer or a two-component developer. Good. The toner image formed by the development is transferred onto a transfer body such as transfer paper by a corotron or a bias application transfer roller, and is fixed by heating to form an image. On the other hand, the toner remaining on the latent image holding member is cleaned by the cleaning member, and is supplied to the next copying operation. In the present invention, a bias roller that performs pressure contact transfer is particularly preferably used. In the case of this pressure transfer, it is possible to transfer at a linear pressure of at least 5 g / cm as a pressure contact force, and even in that case, a good image can be obtained.

[0016]

In the present invention, the rubber hard surface-treated with oil is used.
The spherical silicone rubber fine particles having a degree of 10 to 70 have a hardness smaller than that of the inorganic oxide.
Since it has an average particle diameter of 05 μm or more, it is possible to suppress contact between the surface of the photoreceptor and the toner surface or other inorganic oxides added on the toner surface, and the spherical silicone rubber fine particles are surface-treated with oil. Because of being
It is considered that the friction coefficient between the toner and the photoconductor is remarkably reduced, the transfer efficiency at the time of transfer is improved, and the image defect does not occur even in the transfer by the bias roller. Further, since the spherical silicone rubber fine particles are rubber-like elastic fine particles, the details thereof are unknown by adding them to the toner particles, but the spherical silicone rubber fine particles are elastic due to the stress received from the cleaning member. It is considered that the deformation occurs and the restoring force of the toner agitates the toner in the vicinity of the cleaning member to enhance the cleaning effect. Further, it is considered that the low surface energy of the silicone rubber fine particles suppresses the migration of the silicone rubber fine particles to the photoconductor, and thus suppresses the filming on the photoconductor. Further, since it is rubber-like elastic fine particles, it is considered that it acts softly on the photoconductor and does not damage the photoconductor. Further, since the silicone rubber fine particles are surface-treated with oil, the effect is further expanded. The cause is not clear, but it is considered that the oil treatment reduces the adhesion between the toner and the surface of the photoconductor. Further, since it contains oil and is elastically deformable, the contact area of the transfer roller is increased due to the pressure contact of the transfer roller. As a result, the transfer efficiency is further improved, and even when the transfer roller transfers the image, It is thought that it is possible to prevent the missing.

[0017]

The present invention will be described in detail below with reference to examples, but the scope of the present invention is not limited to the following examples. Incidentally, "parts" in the following is that it means "parts by weight".

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026] Made Zorei 1 (silico - manufacture of Ngomu microparticles) were prepared organosiloxane composition methylvinylsiloxane 250g and methylhydrodiene polysiloxane 30g were mixed in a flask. Next, add 10 g of polyoxyethylene octyl ether and 300 g of pure water,
An emulsion was prepared using a homomixer, and a mixture of 0.5 g of a chloroplatinic acid-olefin complex toluene solution (platinum content 0.02) and 0.5 g of polyoxyethylene octyl ether was added while stirring the emulsion. Then, the mixture was reacted at 30 ° C. for 7 hours. Next, this emulsion is heated to 80 ° C., 30 g of potassium sulfate is added to break the emulsion, pressure filtration is performed with a 300 mesh filter, 1000 g of pure water is added to this cake-like substance, and stirring and washing are performed. It was Then, pressure filtration with a filter of 300 mesh, the resulting isolate was dried in a hot air dryer to obtain spherical silicone over Ngomu fine particles having an average particle size of 1.8 .mu.m. The rubber hardness was 50.

[0027] Production Example 2 (process of silicone over Ngomu particles) dimethylsilicone oil 20 parts of ethanol 500
It was dissolved in section, followed by stirring and mixing with the silicone over Ngomu particles 100 parts ethanol was distilled off solvent using an evaporator, and dried to give surface-treated silicone over Ngomu microparticles. Next, using a mortar, crush the processed product to 10
After sieved through a sieve of 5μm mesh, to obtain a surface treated silicone over Ngomu particulate dimethyl silicone oil. Production Example 3 Production Example 2, except for changing 20 parts of dimethyl silicone oil to 10 parts, in the same manner to obtain a surface treated silicone over Ngomu particulate dimethyl silicone oil. Production Example 4 Production Example 2, 20 parts of dimethyl silicone oil, except that instead of 20 parts of methyl phenyl silicone oil, in the same manner to obtain a silicone over Ngomu fine particles surface-treated with methyl phenyl silicone oil.

Production Example 5 (Production of Magnetic Toner Particles) 100 parts by weight of styrene-butyl acrylate copolymer (80/20) (Mw = 2.0 × 10 ⁵ , Mn = 4,000, Tg = 62 ° C.) Magnetic Body (EPT1000: manufactured by Toda Kogyo Co., Ltd.) 45 parts by weight Low molecular weight polypropylene (Viscole 660P: manufactured by Sanyo Kasei Co., Ltd.) 3 parts by weight Charge control agent (Spiron Black TRH: manufactured by Hodogaya Chemical Co., Ltd.) 2 parts by weight After melt-kneading with a twin-screw extruder, cooling, coarse pulverization, fine pulverization with a jet mill, and classification with a classifier to obtain magnetic toner particles having an average particle size (volume) of 10 μm.

Production Example 6 (Production of non-magnetic toner particles for two-component development) 100 parts by weight of styrene-butyl acrylate copolymer (80/20) (Mw = 2.0 × 10 ⁵ , Mn = 4,000, Tg) = 62 ° C) Carbon black (Regal 330: manufactured by Cabot) 10 parts by weight Low molecular weight polypropylene (Viscor 660P: manufactured by Sanyo Kasei Co., Ltd.) 6 parts by weight Charge control agent (Spiron Black TRH: manufactured by Hodogaya Chemical Co., Ltd.) 2 parts by weight The above components were melt-kneaded by a Banbury mixer, cooled, coarsely pulverized, finely pulverized by a jet mill, and further classified by a classifier to obtain non-magnetic toner particles having an average particle size (volume) of 10 μm.

Production Example 7 (Production of Carrier Particles for Two-Component Development) Central Particle Diameter 60 μm
100 parts of ferrite was put into 80 parts of a toluene solution in which 1.5 parts of polymethylmethacrylate (manufactured by Mitsubishi Rayon: BR-87) was dissolved, mixed at room temperature and atmospheric pressure for 20 minutes, and then heated under reduced pressure while stirring. And toluene was distilled off, followed by sieving with a 105 μm sieve to obtain carrier particles.

Production Example 8 (Mixing of External Additive to Magnetic Toner Particles) The magnetic toner particles obtained in Production Example 5 were mixed with hydrophobic silica (R-972: Nippon Aerosil Co., Ltd.) in Production Examples 1 to 4. The obtained silicone oil-treated or untreated silicon rubber fine particles were put into a Henschel mixer at a predetermined ratio and mixed to prepare a magnetic toner composition having an external additive attached.

Production Example 9 (Preparation of Two-Component Developer) Non-magnetic toner particles obtained in Production Example 6, hydrophobic silica (R-972: manufactured by Nippon Aerosil Co., Ltd.) and Production Examples 1 to 4 were obtained. Silicone oil-treated or untreated silicone rubber fine particles were introduced into a Henschel mixer at a predetermined ratio and mixed to prepare a non-magnetic toner composition to which an external additive was attached. 5 parts of the above toner composition and 95 parts of the carrier particles obtained in Production Example 6 were mixed in a V blender to prepare a two-component developer. The above-mentioned magnetic toner can be transferred by a modified machine which is a modified version of Vivece 200 for transfer and reversal development by bias roller, and the two-component developer can be transferred by corotron transfer or transfer by bias roller, and further reversal development is possible. The Vivace 500 (manufactured by Fuji Xerox Co., Ltd.) was modified as described above, and a continuous copying test was conducted.

Production Example 10 (Production of Silicone Oil Treated Inorganic Oxide Fine Powder) 20 parts of dimethyl silicone oil was dissolved in 500 parts of ethanol and mixed with 100 parts of hydrophobic silica (R-972: Nippon Aerosil Co., Ltd.) with stirring. After that, ethanol as a solvent was distilled off by using an evaporator and dried to obtain surface-treated silica. Next, crush this product using a mortar and
After sieving with a sieve having a mesh of 05 μm, a silica fine powder surface-treated with dimethyl silicone oil was obtained.

[0034] Example 1 100 parts of the magnetic toner particles obtained in Production Example 5, hydrophobic silica (R-972) 0.5 parts of treated with dimethyl silicone oil obtained in Preparation Example 2 was silicone over Ngomu microparticles 0.5 part was mixed with a Henschel mixer to obtain a magnetic toner composition in which an external additive was attached to the toner surface.

[0035] Example 2 100 parts of the magnetic toner particles obtained in Production Example 5, hydrophobic silica (R-972) 0.5 parts of treated with dimethyl silicone oil obtained in Production Example 3 was silicone over Ngomu microparticles 0.8 part was mixed with a Henschel mixer to obtain a magnetic toner composition in which an external additive was attached to the toner surface.

[0036] Example 3 100 parts of the magnetic toner particles obtained in Production Example 5, hydrophobic silica (R-972) 0.5 parts of treated with methyl phenyl silicone oil obtained in Preparation Example 4 was silicone over < 0.5 part of fine rubber particles was mixed with a Henschel mixer to obtain a magnetic toner composition having an external additive attached to the toner surface.

[0037] Example 4 100 parts of the magnetic toner particles obtained in Production Example 5, hydrophobic silica (R-972) 1.0 parts of treated with dimethyl silicone oil obtained in Preparation Example 2 was silicone over Ngomu microparticles 0.5 part was mixed with a Henschel mixer to obtain a magnetic toner composition in which an external additive was attached to the toner surface.

Examples 5 and 6 Silicone treated with 100 parts of the non-magnetic toner particles obtained in Preparation Example 6, 0.5 parts of hydrophobic silica (R-972) and the dimethyl silicone oil obtained in Preparation Example 2. 0.5 parts over Ngomu particles were mixed in a Henschel mixer to obtain a magnetic toner composition was deposited an external additive to the toner surface. 5 parts of the above toner composition and 95 parts of the carrier particles obtained in Production Example 7 were mixed with a V-blender to obtain a two-component developer.

Comparative Example 1 100 parts of the magnetic toner particles obtained in Preparation Example 5 and 0.5 part of hydrophobic silica (R-972) were mixed in a Henschel mixer, and an external additive was made to adhere to the surface of the magnetic toner. A toner composition was obtained. 100 parts of the magnetic toner particles obtained in Comparative Example 2 Production Example 5, the hydrophobic silica (R-972) <br/> silicone over Ngomu particles 0.5 parts obtained in 0.5 parts of Preparation Example 1, The mixture was mixed with a Henschel mixer to obtain a magnetic toner composition having an external additive attached to the toner surface. Comparative Example 3 A magnetic toner composition in which 100 parts of the magnetic toner particles obtained in Production Example 5 and 1.0 part of hydrophobic silica (R-972) were mixed with a Henschel mixer, and an external additive was attached to the toner surface. Got Comparative Example 4 A magnetic toner composition in which 100 parts of the magnetic toner particles obtained in Production Example 5 and 1.5 parts of hydrophobic silica (R-972) were mixed with a Henschel mixer and an external additive was attached to the toner surface. Got

Comparative Example 5 100 parts of the non-magnetic toner particles obtained in Preparation Example 6 and 0.5 part of hydrophobic silica (R-972) were mixed with a Henschel mixer, and external additives were attached to the toner surface. A non-magnetic toner composition was obtained. 5 parts of this toner composition and Production Example 7
95 parts of the carrier particles obtained in (1) were mixed with a V-blender to obtain a two-component developer. Comparative Example 6 A non-magnetic toner obtained by mixing 100 parts of the non-magnetic toner particles obtained in Production Example 6 and 1.0 part of hydrophobic silica (R-972) with a Henschel mixer and attaching an external additive to the toner surface. A composition was obtained. 5 parts of this toner composition and Production Example 7
95 parts of the carrier particles obtained in (1) were mixed with a V-blender to obtain a two-component developer. Comparative Example 7 A non-magnetic toner obtained by mixing 100 parts of the non-magnetic toner particles obtained in Production Example 6 and 0.5 part of hydrophobic silica (R-972) with a Henschel mixer and attaching an external additive to the toner surface. A composition was obtained. 5 parts of this toner composition and Production Example 7
95 parts of the carrier particles obtained in (1) were mixed with a V-blender to obtain a two-component developer.

The non-magnetic toner particles 100 parts obtained in Comparative Example 8 Production Example 6, a hydrophobic silica (R-972) 0.5 parts silicone over Ngomu fine particles obtained in 0.5 parts of Preparation Example 1, The mixture was mixed with a Henschel mixer to obtain a non-magnetic toner composition having an external additive adhered to the toner surface. 5 parts of this toner composition and 95 parts of the carrier particles obtained in Production Example 7 were mixed with a V-blender to obtain a two-component developer. Comparative Example 9 100 parts of the non-magnetic toner particles obtained in Production Example 6 and 1.0 part of the oil-treated silica fine particles obtained in Production Example 10 were mixed with a Henschel mixer, and an external additive was attached to the toner surface. A non-magnetic toner composition was obtained. 5 parts of this toner composition and 95 parts of the carrier particles obtained in Production Example 7 were
A V-blender was mixed to obtain a two-component developer.

(Evaluation of Developer) The developers obtained in the above Examples 1 to 6 and Comparative Examples 1 to 9 were evaluated. For the magnetic toner, a modified Vivace 200 (manufactured by Fuji Xerox Co., Ltd.) modified so that transfer and reversal development by a bias roller can be used. ) Each was evaluated using a modified machine. The test environment is 20
C and 50% RH. The continuous copying test was carried out up to 10,000 sheets for the magnetic toner and up to 150,000 sheets for the two-component developer, and evaluated by observing the cleaning property and the adhesion of the toner to the photoconductor. . The image density was measured by a Macbeth densitometer, and in the state where there is no fog on the copied image, the density is 1.3 or more, the density is 1.1 to less than 1.3, and the density is less than 1.1. The transfer efficiency was evaluated according to the following criteria by transferring the image on the photoconductor to a tape using a solid patch and measuring the weight before and after transferring it to plain paper. Transfer efficiency: ◯ is 95% or more, Δ is 90 to less than 95%, and x is less than 90%. Also, OH
The image loss at the time of transferring the P sheet was evaluated by observing the character portion and grading as follows. Image omission on OHP sheet: G1 has no image omission, G2 has only a slight image omission (amount that can be seen when enlarged), G3 has a slight image omission, G
No. 4 is noticeable. Regarding the evaluation standard of the cleaning property, ∘ indicates that there is no problem on the image, and × indicates that black streaks and image defects due to poor cleaning are observed.

Table 1 shows the evaluation results of Examples 1 to 6 and Comparative Examples 1 to 9 .

[Table 1]

[0044]

By using the toner for developing an electrostatic charge image of the present invention, the filming phenomenon or the like can be prevented in the cleaning step without damaging the surface of the photoconductor or the dielectric and in the cleaning process. It is possible to obtain an image with stable repeatability for a long time without causing this. Further, according to the image forming method of the present invention, transfer efficiency can be improved by forming an image on a transfer body with a transfer roller to which a bias is applied, and image defects are generated regardless of the type of the transfer body. It is possible to maintain high-quality image with no quality for a long time.

Front Page Continuation (72) Inventor Yoshifumi Iida 1600 Takematsu, Minamiashigara City, Kanagawa Prefecture, Fuji Zelocks Co., Ltd. (72) Inventor Kaori Oishi 1600 Takematsu, Minami Ashigara City, Kanagawa Prefecture, Fuji Zelocks Co., Ltd. (56) References JP-A-6-230601 (JP, A) JP-A-6-301234 (JP, A) JP-A-4-274444 (JP, A) JP-A-4-156553 (JP, A) JP-A-4-156551 (JP, A) JP-A 4-166849 (JP, A) JP-A 1-106073 (JP, A) JP-A 6-337543 (JP, A) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) G03G 9/00-9/16

Claims (2)

(57) [Claims] 1. An electrostatic charge comprising toner particles containing a binder and a colorant, and spherical silicone rubber fine particles having a rubber hardness of 10 to 70 surface-treated with oil are added to the toner particles. A toner composition for image development. 2. A step of forming a latent image on a latent image carrier,
Process of developing latent image with developer, developed toner
The process of transferring the image onto the transfer body, adding the toner image on the transfer body
In an image forming method having a fixing step of heat fixing,
The toner composition for developing an electrostatic charge image according to claim 1, as an image agent.
Via the back side of the transfer body as a transfer process.
Image characterized by pressure contact transfer using a roller
Forming method.