JP3236757B2 - Developer carrier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a developing device for developing and visualizing an electrostatic latent image formed on an image carrier such as an electrophotographic photosensitive member or an electrostatic recording derivative. The present invention relates to a developer carrier.

[0002]

2. Description of the Related Art Conventionally, for example, a developing device for developing an electrostatic latent image formed on the surface of a photosensitive drum as an image carrier with a toner of a one-component developer has been developed by using a friction between toner particles and a developer. Positive or negative charge is applied to the toner particles by friction between the toner particles and the developing sleeve as a carrier, and friction between the toner particles and a member that regulates the amount of toner applied on the developing sleeve. To the developing area where the photosensitive drum and the developing sleeve are opposed to each other, and in the developing area, the toner flies on the electrostatic latent image on the surface of the photosensitive drum, and is developed by being attached thereto.
There is known an electrostatic latent image which is visualized as a toner image.

As a developer carrying member (developing sleeve) used for the above-described development, for example, a metal, an alloy thereof, or a compound thereof is formed into a cylindrical shape, and the surface thereof is subjected to predetermined electrolysis, blasting, sanding, or the like. What has been treated to have a surface roughness is used. However, in this case, in the developer layer formed on the surface of the developer carrier by the regulating member, the developer existing near the surface of the developer carrier has a very high electric charge, and the surface of the image carrier has a very high charge. As a result, the toner and the image bearing member have no chance of friction, and the developer cannot have a suitable charge. Under such circumstances, sufficient development and transfer are not performed, and the resulting image is an image having many image density unevenness and character scattering.

In order to prevent the generation of the developer having an excessive charge and the strong adhesion of the developer as described above, a conductive substance such as carbon or graphite or a solid lubricant is dispersed in a binder resin. A method of forming a coating layer on a developer carrier has been proposed in Japanese Patent Application Laid-Open No. 3-36570.

[0005]

However, in recent years, it has been desired to further improve the durability of the developer carrying member and to achieve a low-temperature fixing of the developer for energy saving. However, the above method is not sufficient. For example, in the conventional LBP, it is only necessary that the developer carrier has a stable image quality with a durable number of about 10 k. However, recently, there are models that require a durable number of 30 k or more, so that the abrasion resistance of the coating layer is high. Further improvement is required. Also, due to the demand for low-temperature fixing, the Tg of the developer was conventionally 60 ° C. or higher,
Some models have a temperature of 60 ° C. or less, and the toner is easily fused on the developer carrier or the photosensitive drum due to the temperature rise of the main body. In such a model, in the latter half of the endurance,
Since the graphite on the developer carrier is missing from the coating layer , the developer is excessively charged, and the surface of the developer carrier becomes smooth, so that the fusion of the developer to the image carrier surface occurs. It becomes easy and the image density decreases.

Accordingly, an object of the present invention is to provide a coating layer on the surface of a developer carrier that has good abrasion resistance even in long-term durability of a developing device more than before, and has an effect on surface roughness and toner. An object of the present invention is to provide a developer carrying member which has a stable charge imparting property, does not easily cause excessive charging of the toner and fusion to the developer carrying member and the photosensitive drum, and hardly causes a decrease in image density as a result. Another object of the present invention is to provide a developer carrying member capable of eliminating a sleeve ghost.

[0007]

The above object is achieved by the present invention described below. That is, the present invention relates to a developer carrier for carrying a one-component developer for developing an electrostatic latent image formed on an image carrier, wherein (i) a binder resin is provided on the surface of the developer carrier. , developer bearing, characterized in that it is formed coating layer containing a (ii) the release agent of the core material and core mold release agent containing capsule particles that consists by outer shells formed around the material Body.

[0008]

The operation of the present invention will be described with reference to FIG. The developer carrier of the present invention has a cylindrical substrate 6 and a coating layer 1 covering the surface of the substrate, and the coating layer 1 comprises at least a release agent-containing capsule particle 2 and a binder resin 4. In another embodiment, as shown in FIG. 1, a release agent-containing capsule particle 2 and a binder resin 4 further contain a conductive substance 5. As a result, in the long-term durability of the developing device, in the coating layer 1 of the developer carrying member of the present invention, the capsule particles 2 in the coating layer 1 are rubbed by the friction between the developer and the regulating member in contact with the developer carrying member. Since it is exposed on the surface, the surface roughness can be suitably maintained. The surface roughness at this time is preferably in the range of 0.2 to 3.5 μm in terms of JIS center line average roughness (Ra). When Ra is less than 0.2 μm, the charge amount on the toner carrier becomes high, and the developing property becomes insufficient, which is not preferable. When Ra exceeds 3.5 μm, the toner coat layer on the toner carrier becomes uneven, and This is not preferable because it causes uneven density.

Further, in the developer carrier of the present invention, the mold release encapsulated in the capsule particles 2 constituting the coating layer 1 due to friction between the developer and the regulating member abutting on the developer carrier. The agent 3 suitably seeps into the surface of the coating layer 1 to prevent fusion of the toner to the developer carrier and abrasion of the coating layer , and furthermore, a part of the release agent 3 is carried on the toner. In addition, filming of the toner on the photosensitive drum is prevented. Further, when the conductive material 5 is contained in the coating layer 1, the coating layer 1
Makes it possible to prevent the toner from being excessively charged.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to preferred embodiments of the present invention. Each material constituting the coating layer 1 of the developer carrier of the present invention will be described. First, the release agent-containing capsule particles will be described. The release agent-containing capsule particles used in the present invention have a form in which the release agent is encapsulated in the capsule, and when the capsule is broken by friction with the toner or the regulating blade, the release agent in the capsule is removed. Is suitably coated on the developer carrying member, and has an effect of effectively preventing fusion of the toner to the carrying member. Moreover, the presence of the capsule particles, to enable the surface roughness retention of the membrane layer of the developer carrying member, has also the action of the toner conveying stabilization.
For this reason, the size of the capsule particles is preferably one having a volume average particle size of 1 to 50 μm. If the volume average particle diameter is less than 1 μm, the effect of the insufficient release of the release agent and the surface roughness is insufficient, which is not preferable.
If the ratio exceeds the limit, undesired development is caused due to excessive release of the release agent and protrusion of capsule particles, which is not preferable.

The release agent-containing capsule particles used in the present invention have a basic structure consisting of a core material composed of a release agent and an outer shell formed around the core material. Examples of the release agent constituting the core material of the capsule particles of the present invention include, for example,
Silicone oil, fluorocarbon oil, paraffin wax and its derivatives, microcrystalline wax and its derivatives, Fischer-Tropsch wax and its derivatives, polyolefin wax and its derivatives, carnauba wax and its derivatives, etc. It is not limited to. The derivative also includes an oxide, a block copolymer with a vinyl monomer, or a graft-modified product. In addition, alcohol, fatty acid, acid amide, ester, ketone, hydrogenated castor oil and its derivatives,
Vegetable waxes, animal waxes, mineral waxes, petrolactam and the like can also be mentioned.

The release agent-containing capsule particles used in the present invention are formed by forming an outer shell made of a resin around the above-mentioned core material. In the present invention, the resin material constituting the outer shell of the release agent-containing capsule particles is a resin capable of forming an outer shell around the above-described core substance dispersed in an aqueous medium in the form of oil droplets. There is no particular limitation as long as it is provided, but considering the strength and flexibility of the outer shell as capsule particles, the outer shell resin is preferably made of, for example, a polyurethane resin or a polyurea resin. These resins may form an outer shell by themselves, or may form an outer shell by a mixture thereof.

Next, a method for forming the release agent-containing capsule particles when the outer shell is formed of a polyurethane resin and / or a polyurea resin will be described below. A method of forming an outer shell made of a polyurethane resin and / or a polyurea resin in an aqueous medium around a core substance is already known, and when producing the release agent-containing capsule particles of the present invention, these methods are also used. A conventionally known method can be appropriately used. For example, examples of a method for producing microcapsules using a polymerization reaction that can be used for producing release agent-containing capsule particles include, for example, methods such as an interfacial polymerization method, an internal polymerization method, and an external polymerization method. Can be done.

The outer shell made of a polyurethane resin and / or a polyurea resin is formed by interfacial polymerization of polyisocyanate and polyamine, a prepolymer containing two or more amino groups, piperazine and its derivatives, or a polyol in an aqueous solution. And can easily be formed as the outer shell of the microcapsule. In the reaction for forming the outer shell, it is preferable to perform the outer shell forming reaction while performing the operation of removing the organic solvent contained in the reaction system.

Hereinafter, resin raw materials that can be used in the present invention will be described. First, specific examples of polyisocyanate compounds include, for example, triisocyanate, tetraisocyanate, polyisocyanate prepolymer and the like. Examples of specific compounds of the polyamine include ethylenediamine, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, p-phenylenediamine, m-phenylenediamine, 2-hydroxytrimethylenediamine, diethylenetriamine, triethylenetetraamine, and diethylamino. Examples thereof include propylamine, tetraethylenepentamine, and adducts of an epoxy compound and an amine.

Specific examples of polyol compounds include:
For example, ethylene glycol, 1,4-Bed butanediol, hexamethylene glycol, hydroquinone, resorcinol, glycerol, pentaerythritol, bisphenol A, 4-chloro resorcinol alkali salt of 2,2-bis (4-hydroxyphenyl) propane Alkali salts,
1,5-hydroxynaphthalene alkali salt, phenolphthalene alkali salt, phenol formaldehyde precondensate alkali salt, 4,4′-dihydroxydiphenyl sulfone alkali salt, 2,4-dihydroxybenzophenone alkali salt, 4, Examples thereof include alkali salts of 4'-dihydroxybenzophenone, alkali salts of 2,4-dihydroxybenzaldehyde, melamine-formaldehyde initial condensate, and urea-formaldehyde initial condensate.

After the outer shell is formed around the core material using the above-mentioned materials to prepare microcapsules, the obtained microcapsules are separated from the liquid phase and dried. The operation for separation and drying is usually performed by a method of spray-drying a dispersion liquid containing microcapsules, or a method of heating and drying a slurry containing microcapsules. There are no particular restrictions on the apparatus and equipment used for drying, and examples of the apparatus include, for example, an electric furnace, a muffle furnace, a hot plate, an electric dryer, a fluidized-bed dryer, and an infrared dryer.

Next, the coating layer 1 of the developer carrying member of the present invention
Next, the conductive material contained as necessary will be described. As the conductive substance used in the present invention, for example,
Metal powders such as aluminum, copper, nickel and silver; metal oxides such as antimony oxide, indium oxide and tin oxide;
In addition, carbon materials such as carbon fiber, carbon black, and graphite can be used. Of these, carbon black, especially conductive amorphous carbon, has particularly excellent electrical conductivity, and can be filled with a polymer material to impart conductivity or obtain a certain degree of conductivity by controlling the amount of addition. Therefore, it is suitably used in the present invention. The conductive amorphous carbon used in the present invention preferably has a particle size of about 10 m to 80 m m.

Further, in the present invention, in order to further reduce the adhesion of the toner to the developer carrying member, a solid lubricant is mixed in a film layer on the surface of the developer carrying member formed of the above-mentioned material. It can also be done. Examples of the solid lubricant used in the present invention include molybdenum disulfide, boron nitride, graphite, graphite fluoride, silver-selenium niobium, calcium chloride-graphite, talc, and the like.

The binder resin in which the capsule particles and the conductive material as described above are dispersed and which forms the coating layer on the surface of the developer carrier of the present invention is, for example, a phenol resin, an epoxy resin, or a polyamide resin. Resin, polyester resin, polycarbonate resin, polyolefin resin,
Known resins such as a silicone resin, a fluorine resin, a styrene resin, and an acrylic resin can be used.
In particular, among these, a thermosetting or photocurable resin is preferably used in the present invention.

In the present invention, using the above-mentioned material is formed to be film layer release agent containing capsule particles are contained on the substrate of the developing sleeve. As the substrate to be used,
A substrate used in a conventional developing sleeve, for example, a cylindrical one made of aluminum, stainless steel or the like is preferably used. Formation of the upper Symbol be film layer, coating methods are preferred, the coating solution used for coating Engineering a suitable solvent of the above components, for example, methanol, isopropyl alcohol, n
-It is prepared by dissolving and dispersing in butanol, toluene, MEK, NMP, butyl acetate and the like or a mixed solvent thereof by a suitable method such as a sand mill, a ball mill, a high-speed dissolver or the like.

The composition of the coating solution is as follows.
0 parts by weight, about 1 to 50 parts of the release agent-containing capsule particles.
Parts by weight, if necessary, a range of about 1 to 100 parts by weight of a conductive substance, a solid content of a coating liquid is preferably about 3 to 50% by weight, and a viscosity is about 20 to 500 mPa.
It is preferable to set it in the range of s. The method of applying the coating liquid to the substrate is not particularly limited, for example, a spray method,
Dipping, roller coating, bar coating, electrostatic coating and the like are preferably used. After application, drying and crosslinking / curing treatments are applied as necessary.

The above thickness of the film layer that is formed as is usually about 1 to 100 [mu] m, preferably about 5~50μ
m. The volume resistivity of the coating film layer is usually about 10 ^-3 ~10 ^-2 Ω · cm, preferably from about 10 ^-1 to
The range is 10 ¹ Ω · cm.

Next, a developing device incorporating the above-described developer carrier of the present invention will be described and exemplified.
As shown in FIG. 2, in the developing device incorporating the developer carrier of the present invention, an image carrier carrying an electrostatic latent image formed by a known process, for example, an electrophotographic photosensitive drum 7, , In the direction of arrow B. On the other hand, the developing sleeve 14 as a developer carrier carries the magnetic toner 10 as a one-component magnetic developer supplied by the hopper 9 and rotates in the direction of arrow A, thereby causing the developing sleeve 14 and the photosensitive drum 7 to rotate. Conveys the toner 10 to the developing unit D, which faces the toner 10. Note that a magnet 11 is disposed in the developing sleeve 14 in order to magnetically attract and hold the magnetic toner 10 on the developing sleeve 14. The toner 10 is
By friction with the developing sleeve 14 or the like, a triboelectric charge that enables the electrostatic latent image on the photosensitive drum 7 to be developed is obtained.

Further, in order to regulate the layer thickness of the magnetic toner 10 on the developing sleeve 14 conveyed to the developing section, a regulating blade 8 made of a ferromagnetic metal or the like is provided as shown in FIG. Is suspended from the hopper 9 with a gap width of about 200 to 300 μm from the surface and facing the developing sleeve 14. When the magnetic lines of force from the magnetic pole N1 of the magnet 11 are concentrated on the blade 8, a thin layer of the magnetic toner 10 is formed on the developing sleeve 14. Incidentally, a non-magnetic blade can be used as the blade 8.

The thickness of the thin layer of the magnetic toner 10 formed on the developing sleeve 14 in this manner is smaller than the minimum gap between the developing sleeve 14 and the photosensitive drum 7 in the developing section D. Is preferred. A developing device that develops an electrostatic latent image with such a thin toner layer, that is,
It is particularly effective to incorporate the developer carrier of the present invention into a non-contact type developing device. However, the developer carrier of the present invention is of course also applied to a developing device in which the thickness of the toner layer in the developing section is equal to or greater than the minimum gap between the developing sleeve 14 and the photosensitive drum 7, that is, a contact type developing device. I can do it.

Hereinafter, a non-contact type developing device will be described as an example in order to avoid complication of description. The developing sleeve 14
A developing bias voltage is applied by a power source 15 to fly the magnetic toner 10, which is a one-component magnetic developer, carried thereon. When a DC voltage is used as the developing bias voltage, the image portion of the electrostatic latent image (toner 10
It is preferable to apply to the developing sleeve 14 a voltage having a value between the potential of the region where the toner is adhered and visualized) and the potential of the background portion. On the other hand, in order to increase the density of the developed image or improve the gradation, an alternating bias voltage may be applied to the developing sleeve 14 to form an oscillating electric field in which the direction is alternately reversed in the developing unit D. In this case, it is preferable to apply to the developing sleeve 14 an alternating bias voltage on which a DC voltage component having a value between the potential of the image portion and the potential of the background portion is superimposed.

In so-called regular development in which toner is adhered to a high potential portion of an electrostatic latent image having a high potential portion and a low potential portion to visualize the toner, a toner charged to a polarity opposite to the polarity of the electrostatic latent image is used. On the other hand, in so-called reversal development in which toner is attached to a low potential portion of an electrostatic latent image to visualize the toner, a toner charged to the same polarity as the polarity of the electrostatic latent image is used. Note that the high potential and the low potential are expressed by absolute values. In any case,
The toner 10 is charged to a polarity for developing an electrostatic latent image by friction with the developing sleeve 14. When silica is externally added to the toner 10, silica is also added to the developing sleeve 14.
Charge due to friction with

FIGS. 3 and 4 are structural views showing another developing device in which the developer carrier of the present invention is incorporated. In the developing device shown in FIGS. 3 and 4, as a member for regulating the layer thickness of the magnetic toner 10 on the developing sleeve 14, a material having rubber elasticity such as urethane rubber or silicone rubber, or a metal elastic material such as phosphor bronze or stainless steel is used. An elastic plate 17 made of a material or the like is used. The elastic plate 17 is pressed against the developing sleeve 14 in the developing device of FIG. 3 in a direction opposite to the rotation direction, and is rotated with the developing sleeve 14 in the developing device of FIG. It is characterized in that it is pressed against in the same direction as the direction. As a result, in the developing device described above, a thinner toner layer can be formed on the developing sleeve 14 as compared with the device shown in FIG. Other configurations of the developing device of FIGS. 3 and 4 are basically the same as those of the developing device shown in FIG.
4 and FIG. 4, the same reference numerals as those shown in FIG. 2 indicate the same members.

3 and 4, in which a toner layer is formed on the developing sleeve 14 as described above, a developing device using a one-component magnetic developer containing a magnetic toner as a main component is also used. It is also suitable for those using a one-component non-magnetic developer containing a non-magnetic toner as a main component. In any case, since the toner is rubbed on the developing sleeve 14 by the elastic plate 17, the amount of triboelectric charge of the toner is increased, and the image density is improved.

[0031]

Next, the present invention will be described in more detail with reference to examples and comparative examples of the present invention. First, will be described below by way of specific production examples of the developer are contained in the film layer formed on the carrier surface, the release agent encapsulating capsule particles of the present invention. (Production Example 1) A solution was prepared by dissolving 4 g of a 3: 1 molar adduct of hexamethylene diisocyanate and hexanetriol in 10 g of ethyl acetate, and 30 g of polydimethylsiloxane was mixed into this solution to form a primary liquid. It was adjusted. However, these liquids were prepared while adjusting the liquid temperature to 25 ° C. or less. Next, the same operation as above was carried out, and the primary liquid was stirred in an aqueous methylcellulose solution to prepare an emulsion, an aqueous solution of diethylenetriamine was added thereto to complete the encapsulation, and the obtained microcapsule dispersion was centrifuged. By separating and drying the separated product, powdery silicone-containing capsule particles having a polyurea resin as an outer shell were produced. This was classified using an elbow jet to a volume average particle size of 50 μm to obtain release agent-encapsulated capsule particles of Production Example 1.

The average particle size of the capsule particles was measured by the following method using a Coulter Multisizer (manufactured by Coulter). As a measuring method, 0.1 to 5 ml of a surfactant, preferably an alkylbenzene sulfonate, is added as a dispersing agent to 100 to 150 ml of an electrolytic solution (1% aqueous NaCl solution),
Add about 20 mg. The electrolytic solution in which the sample was suspended was subjected to a dispersion treatment for about 1 to 3 minutes with an ultrasonic disperser, and this was used as a measurement solution. Was calculated, and a volume-based volume average particle diameter (Dv: the median value of each channel is taken as a representative value of the channel) obtained from the volume distribution was calculated.

(Production Example 2) The silicone-containing capsule particles produced in Production Example 1 were classified to a volume average particle size of 15 μm using an elbow jet to obtain release agent-encapsulated capsule particles of Production Example 2.

(Production Example 3) The silicone-containing capsule particles produced in Production Example 1 were classified into volume-average particle diameters of 1 μm using an elbow jet to obtain release agent-encapsulated capsule particles of Production Example 3.

(Production Example 4) A fluorocarbon oil having a polyurea resin as an outer shell was produced in the same manner as in Production Example 1 except that a fluorocarbon oil was used instead of polydimethylsiloxane. Containing capsule particles were produced. This was classified using an elbow jet to a volume average particle size of 50 μm to obtain release agent-encapsulated capsule particles of Production Example 4.

(Production Example 5) The fluorocarbon oil-containing capsule particles produced in Production Example 4 were classified to a volume average particle size of 15 μm using an elbow jet to obtain release agent-encapsulated capsule particles of Production Example 5.

Production Example 6 The fluorocarbon oil-containing capsule particles produced in Production Example 4 were classified to a volume average particle diameter of 1 μm using an elbow jet to obtain release agent-encapsulated capsule particles of Production Example 6.

(Preparation Example 7) Paraffin wax-containing capsule particles having a polyurea resin as an outer shell were prepared in the same manner as in Preparation Example 1 except that paraffin wax was used instead of polydimethylsiloxane. Manufactured. This was classified using an elbow jet to a volume average particle size of 50 μm to obtain release agent-encapsulated capsule particles of Production Example 7.

(Production Example 8) The paraffin wax-containing capsule particles produced in Production Example 7 were subjected to volume average particle diameter 15 μm using an elbow jet.
To obtain release agent-encapsulated capsule particles of Production Example 8.

(Production Example 9) The paraffin wax-containing capsule particles produced in Production Example 7 were classified into volume-average particle diameters of 1 μm using an elbow jet to obtain release agent-encapsulated capsule particles of Production Example 9.

Using the release agent-encapsulated capsule particles of Production Examples 1 to 9 obtained above, a developer carrier of the present invention was produced. Example 1-200 parts by mass of PMMA resin-90 parts by mass of carbon black-290 parts by mass of IPA (isopropyl alcohol) 290 parts by mass of the above material with zirconia particles having a diameter of 2 mm.
The mixture was dissolved and dispersed by a sand mill for 0 hour, and then the zirconia particles were separated by a sieve to obtain a conductive binder resin (hereinafter, referred to as stock solution 1).

Undiluted solution 1 (PMMA + carbon black; solid content 50%) 290 parts by mass 5 parts by mass of silicone-containing capsule particles (volume average particle diameter 50 μm) obtained in Production Example 1 The mixture was dissolved and dispersed by sand milling for an hour, and then the glass beads were separated by a sieve, and the solid content was adjusted to 30% with IPA to obtain a coating liquid 1 containing silicone-containing capsule particles having a volume average particle diameter of 50 μm. The composition of the coating liquid 1 was as follows. L (solid lubricant) / C (conductive substance) / B (binder resin) / R (capsule particles) = 0 / 0.9 / 2 / 0.1 The coating liquid 1 was sprayed by φ16 mm aluminum cylinder on to form a coating layer of 10 [mu] m, and then hot-air drier by heating at 100 ° C. 30 minutes to prepare a developer carrying member of the present embodiment is cured. The surface roughness of the coating layer formed on the surface of the obtained developer carrier was Ra = 1.7 μm.

The developing sleeve obtained as described above is
Built in Laser Jet IIISI (HP LBP), 24 ° C, 65% RH, normal temperature and normal humidity (N / N), 10
℃, 10% RH low temperature and low humidity (L / L), and 30 ℃, 8
An image output test was performed in three environments of high temperature and high humidity (H / H) of 0% RH. As a developer used at this time, a toner having the following composition and a weight average particle diameter of 6 μm was prepared, and 1.2% of colloidal silica was externally added.・ Styrene-butyl acrylate-maleic acid-n-butyl half ester copolymer (Tg 56 ° C.) 100 parts by mass ・ Magnetite 100 parts by mass ・ Negative charge control agent 3 parts by mass ・ Low molecular weight polypropylene 5 parts by mass

[0044]

[Evaluation] As image characteristics, image density, ghost, change in roughness as a film strength, and abrasion after image formation of 40,000 sheets were evaluated according to the following criteria. Table 1 shows the results of the evaluation. As is clear from Table 1, after 100 sheets and 40,000 sheets, both of the results were favorable.

Image density (Macbeth reflection density) ： １: 1.4 or more ：: 1.2 or more to less than 1.4 Δ: 1.0 or more to less than 1.2 ×: less than 1.0

Ghost (visual) ：: Excellent ：: Good △: Practical possible ×: Practical impossible

Variation in Roughness The surface roughness Ra of the coated developer carrier was measured and evaluated at the initial stage and after 40,000 sheets were printed. Surface roughness R
As for “a”, a surf coder SE-3300 manufactured by Kosaka Laboratory was used to measure three points in the axial direction × two points in the circumferential direction, respectively, for a total of six points, and the average value was obtained.

Abrasion The outer diameter of the developer carrier coated with the coating film at the initial stage and after 40,000 sheets was measured with a laser three-dimensional measuring instrument, and the scraping amount was calculated from the decrease in outer diameter.

Example 2 200 parts by mass of phenolic resin 80 parts by mass of titanium oxide 280 parts by mass of IPA The above-mentioned material was converted into zirconia particles having a diameter of 2 mm.
The mixture was dissolved and dispersed in a sand mill for 0 hour, and then the zirconia particles were separated by a sieve to obtain a conductive binder resin (hereinafter, referred to as stock solution 2). Next, a coating liquid 2 having the following composition containing silicone-containing capsule particles having a volume average particle diameter of 15 μm was obtained in the same manner as in Example 1 except that the composition was changed as follows. The composition of the coating liquid 2 is L / C / B / R = 0 /
0.8 / 2 / 0.2. -Stock solution 2 (phenol + titanium oxide; solid content 50%) 280 parts by mass-Silicone-containing capsule particles obtained in Production Example 2 (volume average particle size 15 µm) 10 parts by mass Using the coating solution 2 obtained above, The drying conditions were 120 ° C /
A developer carrying member was prepared in the same manner as in Example 1 except that the time was 45 minutes. When the surface roughness of the coating layer on the surface of the developer carrying member of this example was measured, it was Ra = 1.8 μm.
Further, using the developer carrying member of the present example, an image was formed in the same manner as in Example 1, and the evaluation was performed in the same manner. The results are shown in Table 1. After 100 sheets and 40,000 sheets, both of the results were favorable.

Example 3 200 parts by mass of epoxy resin 10 parts by mass of graphite 40 parts by mass of tin oxide 250 parts by mass of IPA The above material was converted into zirconia particles having a diameter of 2 mm.
The mixture was dissolved and dispersed in a sand mill for 0 hour, and then the zirconia particles were separated by a sieve to obtain a conductive binder resin (hereinafter, referred to as stock solution 3). Next, a coating liquid 3 having the following composition containing silicone-containing capsule particles having a volume average particle diameter of 1 μm was prepared in the same manner as in Example 1 except that the composition was changed as follows.
I got The composition of the coating liquid 3 is L / C / B / R = 0.1 /
0.4 / 2 / 0.5. -Stock solution 3 (epoxy + graphite + tin oxide; solid content 50%) 250 parts by mass-Silicone-containing capsule particles obtained in Production Example 3 (volume average particle size 1 m) 25 parts by mass The coating solution 3 obtained above was used. And drying conditions of 110 ° C /
A developer carrying member was prepared in the same manner as in Example 1 except that the time was 30 minutes. When the surface roughness of the coating layer on the surface of the developer carrying member of this example was measured, it was Ra = 1.9 μm.
Further, using the developer carrying member of the present example, an image was formed in the same manner as in Example 1, and the evaluation was performed in the same manner. The results are shown in Table 1. After 100 sheets and 40,000 sheets, both of the results were favorable.

Example 4 • Stock solution 1 (PMMA + carbon black; solid content 50%) 290 parts by mass • Fluorocarbon oil-containing capsule particles of Production Example 4 (volume average particle size 50 μm) 5 parts by mass In the same manner as in Example 1, a coating liquid 4 containing fluorocarbon oil-containing capsule particles having a volume average particle diameter of 50 μm was obtained. The composition of the coating liquid 4 is L / C / B /
R = 0 / 0.9 / 2 / 0.1. Using the coating liquid 4 obtained above, a developer carrying member was prepared in the same manner as in Example 1. The surface roughness of the coating layer on the surface of the developer carrying member of this example was Ra = 1.7 μm. Further, using the developer carrying member of the present example, an image was formed in the same manner as in Example 1, and the evaluation was performed in the same manner. The results are shown in Table 1. After 100 sheets and 40,000 sheets, both of the results were favorable.

Example 5 -Stock solution 2 (phenol + titanium oxide; solid content: 50%) 280 parts by mass-Fluorocarbon oil-containing capsule particles of Production Example 5 (volume average particle size: 15 µm) 10 parts by mass In the same manner as in Example 2, a coating liquid 5 containing capsule particles containing a fluorocarbon oil having a volume average particle size of 15 μm was obtained. The composition of the coating liquid 5 is L / C / B /
R = 0 / 0.8 / 2 / 0.2. Using the coating liquid 5 obtained above, a developer carrying member was prepared in the same manner as in Example 2. The surface roughness of the coating layer on the surface of the developer carrying member of this example was Ra = 1.8 μm. Further, using the developer carrying member of the present example, an image was formed in the same manner as in Example 1, and the evaluation was performed in the same manner. The results are shown in Table 1. After 100 sheets and 40,000 sheets, both of the results were favorable.

Example 6 250 parts by mass of stock solution 3 (epoxy + graphite + tin oxide; solid content 50%) 25 parts by mass of capsule particles containing fluorocarbon oil of Production Example 6 (volume average particle size 1 μm) Using the same procedure as in Example 3, coating liquid 6 containing fluorocarbon oil-containing capsule particles having a volume average particle diameter of 1 μm was obtained. The composition of the coating liquid 6 is L / C / B / R
= 0.1 / 0.4 / 2 / 0.5. Using the coating liquid 6 obtained above, a developer carrying member was produced in the same manner as in Example 3. The surface roughness of the coating layer on the surface of the developer carrying member of this example was Ra = 1.9 μm. Further, using the developer carrying member of the present example, an image was formed in the same manner as in Example 1, and the evaluation was performed in the same manner. The results are shown in Table 1. After 100 sheets and 40,000 sheets, both of the results were favorable.

Example 7 -Stock solution 1 (PMMA + carbon black; solid content 50%) 290 parts by mass-Paraffin wax-containing capsule particles of Production Example 7 (volume average particle size 50 µm) 5 parts by mass Example 1 using the above materials By the same operation as in 1, a coating liquid 7 containing fluorocarbon oil-containing capsule particles having a volume average particle diameter of 1 μm was obtained. The composition of the coating liquid 7 is L / C / B / R
= 0 / 0.9 / 2 / 0.1. Using the coating liquid 7 obtained above, a developer carrying member was produced in the same manner as in Example 1. The surface roughness of the coating layer on the surface of the developer carrying member of this example was Ra = 1.7 μm. Further, using the developer carrying member of the present example, an image was formed in the same manner as in Example 1, and the evaluation was performed in the same manner. The results are shown in Table 1. After 100 sheets,
After 40,000 sheets, both were favorable results.

Example 8 280 parts by mass of stock solution 2 (phenol + titanium oxide; solid content 50%) 10 parts by mass of the paraffin wax-containing capsule particles of Production Example 8 (volume average particle size 15 μm) By the same operation as in 2, a coating liquid 8 containing capsule particles containing paraffin wax having a volume average particle size of 15 μm was obtained. The composition of the coating liquid 8 is L / C / B
/R=0/0.8/2/0.2. Using the coating liquid 8 obtained above, a developer carrying member was produced in the same manner as in Example 2. The surface roughness of the coating layer on the surface of the developer carrying member of this example was Ra = 1.8 μm. Further, using the developer carrying member of the present example, an image was formed in the same manner as in Example 1, and the evaluation was performed in the same manner. The results are shown in Table 1. After 100 sheets and 40,000 sheets, both of the results were favorable.

Example 9 250 parts by mass of stock solution 3 (epoxy + graphite + tin oxide; solid content 50%) 25 parts by mass of paraffin wax-containing capsule particles of Production Example 9 (volume average particle size 1 μm) In the same manner as in Example 3, a coating liquid 9 containing paraffin wax-containing capsule particles having a volume average particle diameter of 1 μm was obtained. The composition of the coating liquid 9 is L / C / B /
R = 0.1 / 0.4 / 2 / 0.5. Using the coating liquid 6 obtained above, a developer carrying member was produced in the same manner as in Example 3. The surface roughness of the coating layer on the surface of the developer carrying member of this example was Ra = 1.9 μm. Using the developer carrying member of this embodiment, an image was formed in the same manner as in Example 1, and the evaluation was performed in the same manner. Table 1 shows the results.
After 40,000 sheets, good results were obtained.

COMPARATIVE EXAMPLE 1 In order to obtain an appropriate surface roughness by increasing the particle size of graphite, the following materials were used and zirconia particles having a diameter of 2 mm were sand-milled for 10 hours to dissolve and disperse. The particles were separated by a sieve to obtain a conductive binder resin (hereinafter, referred to as stock solution 4).・ Phenol resin 200 parts by mass ・ Graphite (volume average particle diameter 20 μm) 80 parts by mass ・ Carbon black 20 parts by mass ・ IPA 300 parts by mass Next, the obtained conductive binder resin is subjected to IPA to solid content of 30 parts.
% And a coating liquid is used, and the drying condition is set to 120 using this.
A developer carrier for comparison was prepared in the same manner as in Example 1 except that the temperature was set to 45 ° C./45 minutes. Coating on the surface of this developer carrier
When the surface roughness of the layer was measured, it was Ra = 1.7 μm. This was incorporated into a developing device in the same manner as in Example 1 to produce an image and evaluated. Table 1 shows the results. As a result,
There was no problem after 100 images were printed, but after 40,000 sheets, ghost deterioration due to excessive charging of toner, image density reduction due to toner fusion, and toner fusion to the photosensitive drum were observed. In addition, the coating layer on the surface of the developer carrier was significantly scraped off and the surface roughness was significantly reduced.

Comparative Example 2 A conductive binder resin (hereinafter referred to as stock solution 5) was prepared in the same manner as in Comparative Example 1, except that graphite having a volume average particle size of 20 μm was replaced with graphite having a volume average particle size of 7 μm.
The obtained, which had use in <br/> the coating liquid to adjust the solid content to 30% IPA. A 16 mm aluminum cylinder (Ra) obtained by sandblasting this paint with # 100 alumina abrasive grains
= 2.0 .mu.m) on, spray coated as in Example 1, drying conditions except that minutes 120 ° C. / 45 Example 1
A developer carrier was produced in the same manner as described above. When the surface roughness of the coating layer on the surface of the obtained developer carrier was measured, Ra
= 1.9 μm. This was incorporated into a developing device to produce an image in the same manner as in Example 1, and evaluated. Table 1 shows the results. There was no problem after 100 sheets of image formation, but after 40,000 sheets, ghost deterioration due to excessive charging of toner, image density reduction due to toner fusion, and toner fusion to the photosensitive drum were observed. In addition, the film layer on the surface of the developer carrier was scraped and the surface roughness was significantly reduced.

Table 1: Evaluation results of Examples 1 to 9 and Comparative Examples 1 and 2

Table 2: Formulation Examples of Examples 1 to 9 and Comparative Examples 1 and 2 *: Solid lubricant / conductive material / binder / capsule particles

[0061]

As described above, according to the present invention, the abrasion resistance of the coating layer is high, and the surface roughness and the charge-imparting property to the toner can be improved even in a long-term durability test of the developing device which is longer than the conventional one. It is stable and does not easily cause excessive charging of the toner and fusing to the developer carrying member and the photosensitive drum. As a result, the image density can be obtained not only at room temperature and normal humidity but also at low temperature, low humidity, and high temperature and high humidity. It is possible to obtain a high-quality image free from deterioration and sleeve ghost. That is, a high-quality image that is stable over a long period of time is provided.

[Brief description of the drawings]

1 shows a cross-sectional Mengai schematic representation of a portion of the developer carrying member of the present invention.

FIG. 2 shows an example of a developing device in which the developer carrier of the present invention is incorporated.

FIG. 3 shows another example of a developing device in which the developer carrier of the present invention is incorporated.

FIG. 4 shows another example of a developing device into which the developer carrier of the present invention is incorporated.

[Explanation of symbols]

 1: coating layer 2: release agent-containing capsule particles 3: encapsulated release agent 4: binder resin 5: conductive material 6: cylindrical substrate 7: photosensitive drum 8: regulating blade 9: hopper 10: toner 11 : Magnet 12: Cylindrical substrate 13: Coating layer 14: Developing sleeve 15: Power supply 16: Stirrer 17: Elastic plate A: Rotating direction of developing sleeve B: Rotating direction of photosensitive drum D: Developing section

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuya Toyooka 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (56) References JP-A-4-194867 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) G03G 15/08 G03G 15/09

Claims (4)

(57) [Claims] 1. A developer carrier for carrying a one-component developer for developing an electrostatic latent image formed on an image carrier, comprising: (i) a binder resin on a surface of the developer carrier; (ii) an outer shells formed around the core material and core material of the release agent
It is containing a releasing agent containing capsule particles that consists I
A developer carrier, wherein a film layer is formed. Wherein the coating layer of the developer carrying member surface, the developer carrying member according to claim 1, which contains more conductive material. 3. A release agent release agent in containing capsule particles is a silicone oil according to claim 1 or developer carrying member according to 2. 4. The coating layer has a layer thickness of 1 to 100 μm.
The method according to any one of claims 1 to 3, wherein
Developer carrier.