WO1999047823A1 - Cylindre revetu de caoutchouc a resistance electrique moyenne et dispositif electrophotographique - Google Patents

Cylindre revetu de caoutchouc a resistance electrique moyenne et dispositif electrophotographique Download PDF

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Publication number
WO1999047823A1
WO1999047823A1 PCT/JP1999/001382 JP9901382W WO9947823A1 WO 1999047823 A1 WO1999047823 A1 WO 1999047823A1 JP 9901382 W JP9901382 W JP 9901382W WO 9947823 A1 WO9947823 A1 WO 9947823A1
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WO
WIPO (PCT)
Prior art keywords
rubber
roll
photosensitive drum
epichlorohydrin
layer
Prior art date
Application number
PCT/JP1999/001382
Other languages
English (en)
Japanese (ja)
Inventor
Takeshi Ooishi
Kouichi Nishimura
Original Assignee
Nippon Zeon Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Zeon Co., Ltd. filed Critical Nippon Zeon Co., Ltd.
Publication of WO1999047823A1 publication Critical patent/WO1999047823A1/fr

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0818—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the structure of the donor member, e.g. surface properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0208—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus
    • G03G15/0216—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus by bringing a charging member into contact with the member to be charged, e.g. roller, brush chargers
    • G03G15/0233—Structure, details of the charging member, e.g. chemical composition, surface properties
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1665—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
    • G03G15/167—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer
    • G03G15/1685—Structure, details of the transfer member, e.g. chemical composition

Definitions

  • the present invention relates to a rubber roll used in an electrophotographic apparatus such as an electrophotographic printer and an electrophotographic apparatus having the same. More specifically, the present invention relates to a rubber roll having a low hardness on the roll surface and a stable compression set. The present invention relates to a medium-resistance rubber roll excellent in durability and durability, and an electrophotographic apparatus having the same.
  • the outer peripheral surface of a photosensitive drum is uniformly charged, and then an image is formed on the outer peripheral surface of the photosensitive drum by exposure to an electrostatic latent image, and the electrostatic latent image is formed using a toner. It has a mechanism for printing by developing and transferring the developed image to printing paper.
  • the photosensitive drum and the developing roll are arranged so as to be in contact with each other, and the toner conveyed by the developing roll is moved between the developing roll and the developing blade. It is charged by friction. The charged toner moves from the developing roll to the photosensitive drum by the electric field generated between the developing roll and the photosensitive drum, and the latent image is developed.
  • a roll having a structure in which a rubber layer is formed on the surface of a core is used as a roll.
  • a voltage must be applied between these rubber rolls and the photosensitive drum to generate an electric field. Therefore, rubber roll that has an electrical resistivity of the medium resistance region (medium res i st ivi ty range ), i.e. volume resistivity is required to be 1 0 6 ⁇ 1 0 1 2 ⁇ ⁇ cm.
  • the medium resistance roll generally, a roll obtained by dispersing a conductive filler such as carbon black, carbon fiber, or metal powder in resin or rubber and adjusting the electric resistance value is used.
  • a conductive filler such as carbon black, carbon fiber, or metal powder in resin or rubber
  • the volume specific resistance value is 10 fi to 1 ⁇
  • the volume resistivity of itself has been proposed to use the E Pikuroruhi Doringomu a 1 0 7 ⁇ 1 0 1 1 ⁇ . Cm.
  • Rubber having such a volume resistivity does not require the addition of a conductive filler, and the unevenness of the electrical resistance due to uneven dispersion of the conductive filler occurs. Absent. However, epichlorohydrin rubber has a problem that the toner adheres to the surface and is easily stained due to its high adhesiveness on the surface.
  • JP-A-6-266620 A roll in which a non-adhesive coating layer made of a fluororesin composition or the like containing a conductive filler or the like is formed outside the epichlorohydrin rubber layer to prevent toner adhesion has also been proposed (JP-A-6-266620). No. 6, etc.). However, there was a problem that the durability of continuous printing was not sufficient, such as the photosensitive drum being worn or the toner being deteriorated, because the hardness of the roll surface was not sufficiently low.
  • An object of the present invention is to prevent toner from adhering, to reduce environmental dependency, to improve durability and 0
  • An object of the present invention is to provide a low-hardness medium resistance rubber roll having excellent compression distortion resistance. More specifically, an object of the present invention is to provide an electrophotographic apparatus for developing an electrostatic latent image on a photosensitive drum into a visible image by using a toner, and a developer port arranged in contact with the photosensitive drum. It is an object of the present invention to provide a medium-resistance rubber roll that can be suitably used as a roll, a charging roll, a transfer roll, and the like.
  • the present inventors have conducted intensive studies and found that a composition containing a core (A), an epichlorohydrin rubber (a) and a low molecular weight epichlorohydrin polymer (b) was bridged.
  • a rubber roll having at least a three-layer structure with a certain elastic layer (B) and surface layer (C) can be adjusted to an appropriate electric resistance without using a conductive filler, etc., and the surface layer (C) can be used practically. It has been found that the roll has an appropriate elasticity even when a resin layer having a thickness that can be withstood is used.
  • This medium-resistance rubber roll does not wear or contaminate the photosensitive drum. In addition, the toner hardly deteriorates and the durability is excellent.
  • the present invention has been completed based on these findings.
  • the core (A), the rubber component (a) having epichlorohydrin as an essential component, the low molecular weight epichlorohydrin polymer (b), and the crosslinking agent (c) The present invention provides an elastic layer (B) formed by cross-linking a contained epichlorohydrin rubber composition, and a medium-resistance rubber mouth having at least three surface layers (C). Further, an electrophotographic apparatus having the rubber roll is provided.
  • the central part of the medium resistance rubber roll of the present invention is a core (A).
  • the core (A) used in the present invention is not particularly limited as long as it is used as a core of a medium-resistance rubber roll, but is usually made of a conductive and rigid material. Things.
  • a conductive and rigid material metals such as stainless steel and copper are preferably used for the core of a medium resistance rubber roll.
  • the core body (A) may have a cavity inside or may not have a cavity.
  • the size and shape may be determined according to the purpose of use.
  • the core (A) is shown in Fig. 1 and Fig. 2.
  • the shape is a perfect cylinder. Adhesion between the core (A) and the layer laminated thereon, generally between the outer peripheral surface of the core and the layer laminated on the outer peripheral surface becomes uniform, and the nozzle is brought into contact with the photosensitive drum. This is because the pressure of the contact portion in the case of contact becomes uniform.
  • the shape of the core is not particularly limited as long as the adhesiveness between the core and the layer to be laminated or the pressure at the contact portion with the photosensitive drum is within an allowable range.
  • the deflection of the core is reduced, and the contact portion with the photosensitive drum at the center in the axial direction is used. It is also possible to use a material whose pressure is smaller than that at both ends. It is preferable that the outer peripheral surface of the core body has a large surface roughness in order to improve the adhesion with the layer laminated on the outer peripheral surface.
  • An electric resistance adjusting layer made of a conductive material may be provided on the outer peripheral surface of the core (A) as necessary. When an electric resistance adjusting layer is provided, it is possible to adjust the magnitude of the electric resistance of the roll by changing its thickness.
  • the conductive material used as the material of the electric resistance adjusting layer is not particularly limited, and conductive resin, conductive rubber, or a conductive filler such as carbon black, carbon fiber, metal powder, or the like is dispersed in the resin or rubber. Examples thereof include compositions prepared to have medium resistance.
  • the elastic layer (B) is formed on the outer peripheral surface of the core (A) or on the outer peripheral surface of the electric resistance adjusting layer formed on the outer peripheral surface of the core (A).
  • This elastic layer (B) is formed by a crosslinked product of an epichlorohydrin rubber composition containing a rubber component (a) containing epichlorohydrin rubber as an essential component, a low molecular weight epichlorohydrin polymer (b) and a cross-linking agent (c). It is configured.
  • the rubber component (a) used in the present invention is a rubber containing epichlorohydrin rubber as an essential component, and may be a combination of other rubbers.
  • Epichlorohydrin rubber is a copolymer rubber obtained by copolymerizing epichlorohydrin with a homopolymer rubber or by mixing epichlorohydrin with an alkylene oxide and / or an unsaturated epoxide.
  • alkylene oxide for example, saturated alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide and isobutylene oxide; epifluorohydrin; Halogen-substituted saturated alkylene oxides such as lomethinoleethylene oxide; and the like, and each can be used alone or in combination of two or more. Of these, ethylene oxide and propylene oxide are preferred in view of availability and the like.
  • the ratio of the two is a molar ratio, preferably 10/90 to 90/10, more preferably 15/8. 5 to 85 Z15, particularly preferably 20/80 to 80/20.
  • Unsaturated epoxides include, for example, butadiene monooxide, 1,2-epoxy 5-hexene, 1,2-epoxy 17-octene, and other unsaturated epoxides / alkylene oxades; Glycidyl ethers such as glycidyl ether: glycidyl esters such as glycidyl methacrylate and glycidyl acrylate; Of these, aryl glycidyl ether is preferred. By copolymerizing the unsaturated epoxide, cross-linking with a sulfur cross-linking agent or an organic peroxide becomes possible, and pollution control and metal corrosion resistance are improved.
  • the amount of epichlorohydrin units in the epichlorohydrin gum is preferably from 30 to 100 mol 0 /. More preferably, 35 to 90 moles 0 /. More preferably, it is 40 to 80 monoles%. If the amount of the epichlorohydrin unit in the epichloronohydrin rubber is too large, the volume resistivity increases, and if it is too small, the hygroscopicity increases.
  • the amount of alkylene oxide units in the epichlorohydrin rubber is preferably from 0 to 70 mol 0 /. , More preferably from 10 to 65 mol%, particularly preferably from 20 to 60 mol%. If the amount of the alkylene oxide unit in the epichlorohydrin rubber is too large, it may not be used depending on the environment because the hygroscopicity becomes high or the volume-dependent resistance value becomes environment-dependent.
  • the amount of unsaturated epoxide units in the epichlorohydrin rubber is preferably from 0 to 15 mol 0 /. More preferably, 1 to 12 mol 0 /. Particularly preferably, it is 2 to 10 mol 0/0 . If the amount of unsaturated epoxide units in c- epiclorhydrin rubber is too large, low hardness It is difficult to obtain a crosslinked product. If the amount of unsaturated epoxide units is too small, it may not bridge.
  • the epichlorohydrin rubber has a Mooney viscosity at 100 ° C. of preferably 20 to 200, more preferably 40 to 150, and particularly preferably 50 to 100, because kneading in processing is easy. ⁇ 100 are used.
  • the method for producing the epichlorohydrin rubber is not particularly limited.
  • it can be produced by a known solution polymerization method using an organoaluminum compound catalyst described in Japanese Patent Publication No. 56-511171.
  • the rubber which can be used in combination with the epichlorohydrin rubber is not particularly limited, but preferred are an acrylonitrile butadiene copolymer rubber and hydrogenated hydrogen thereof.
  • Ratio of Epikuroruhi Dori Ngomu and other rubber in the rubber component (a), generally, Epikuroruhi drill Ngomu 5 0-1 0 0 by weight 0 /. , Preferably 6 0-9 0% by weight, particularly preferably 7 0-8 5 weight 0 /. , Other rubber 0 ⁇ 50 weight 0 /. Preferably 10-40 weight 0 /. Particularly preferably, it is in the range of 15 to 30% by weight. If the amount of the other rubber is too large, the compatibility with the low molecular weight epichlorohydrin polymer (b) is deteriorated, and if the amount is too small, the effect of adding the optional rubber cannot be obtained.
  • the low molecular weight epichlorohydrin polymer (b) used in the present invention is a polymer containing an epichlorohydrin monomer unit.
  • the low molecular weight epichlorohydrin polymer (b) may contain a monomer unit copolymerizable with epichlorohydrin.
  • monomers copolymerizable with epichlorohydrin include alkylene oxides and unsaturated epoxides.
  • alkylene oxide / unsaturated epoxide those described as monomers of the epichlorohydrin rubber contained in the rubber component (a) are used.
  • the amount is preferably from 30 to 100 mol 0 /. More preferably, 35 to 100 mol 0 /. Particularly preferably 40 to 100 mol 0 /. It is.
  • Arukirenokishi degrees is good Mashiku 0-7 0 mole 0/0, more preferably 0-6 5 mol%, particularly preferably from 0 to 6 0 mol 0 /. It is.
  • the amount of unsaturated epoxide units is preferably from 0 to 20 mol. /. More preferably, 0 to 15 mol%, particularly preferably 0 to 10 mol 0 /. It is. If the unsaturated epoxide unit content is too small, the low molecular weight epichlorohydrin polymer (b) will easily bleed from the crosslinked product of the epichlorohydrin rubber composition when crosslinked with a sulfur crosslinker or an organic peroxide. Become. On the other hand, if the amount of the unsaturated epoxide unit is too large, it is difficult to produce the low molecular weight epichlorohydrin polymer (b).
  • the low molecular weight epichlorohydrin polymer (b) is in a liquid state at normal temperature (20 to 30 ° C.), and preferably has a molecular weight of 1,000 to 100,000. It is preferably from 1,500 to 8,000, and particularly preferably from 2,000 to 6,000. In addition, the Mooney viscosity of the low molecular weight epichlorohydrin polymer is preferably 1 or less, and it is often impossible to measure it because it is too small.
  • the reduced viscosity (NOC) of the low molecular weight epichlorohydrin polymer (b) in a toluene solution is preferably from 0.01 to 0.5, more preferably from 0.02 to 0.4, and particularly preferably from 0.02 to 0.4.
  • the method for producing the low molecular weight epichlorohydrin polymer (b) is not particularly limited.
  • a known solution weight using a catalyst such as stannic chloride, an organic aluminum / water complex, or a boron fluoride / ether complex. It can be manufactured legally.
  • crosslinking agent (c) examples include a sulfur crosslinking agent, an organic peroxide, mercapto triazines, and thiopereas.
  • sulfur crosslinking agents include sulfur and thiurams such as morpholine disulfide and tetramethylthiuram disulfide.
  • Organic peroxides include ketone peroxides, peroxyesters, disilver oxides, and alkyl peroxides, and when these organic peroxides are used, compression set resistance is reduced. Good crosslinked products are obtained.
  • thiopereas include thiopereas, dibutyl thiopereas, and triethyl thiopereas.
  • the epichlorohydrin rubber composition used in the present invention contains a rubber component (a) containing epichlorohydrin rubber, a low molecular weight epichlorohydrin polymer (b), and a crosslinking agent (c).
  • the amount of the low molecular weight epichlorohydrin polymer (b) is preferably from 10 to 150 parts by weight, more preferably from 200 to 100 parts by weight of the epichlorohydrin rubber in the rubber component (a). To 120 parts by weight, particularly preferably 30 to 100 parts by weight.
  • the amount of the low molecular weight epichlorohydrin polymer (b) is too small, the hardness of the epichlorin rubber composition after crosslinking is too high. If the amount is too large, the low molecular weight epichlorohydrin polymer (b) will bleed from the crosslinked product of the epichlorin rubber composition or the viscosity will be low, making it difficult to prepare the rubber composition such as kneading.
  • the amount of the crosslinking agent (c) is preferably 0.1 to 100 parts by weight of the rubber component (a).
  • ordinary rubber compounding agents such as a crosslinking accelerator, a reinforcing agent, a filler, and an antioxidant can be appropriately mixed with the epichlorohydrin rubber composition.
  • the epichlorohydrin rubber composition can be obtained by mixing the materials to be compounded using a conventional kneading machine such as a mouth-to-wall Banbury mixer.
  • Crosslinking of the epichlorohydrin rubber composition can be carried out by heating to 100 to 250 ° C. using an ordinary rubber processing and molding machine such as a press, a steam pot, and an injection molding machine.
  • the low molecular weight epichlorohydrin polymer does not bleed, and the hardness (Duro-A) is preferably 40 or less, more preferably 35 or less, and particularly preferably 30 or less. A crosslinked product is easily obtained.
  • the epichlorohydrin rubber composition used in the present invention has low viscosity and dimensional stability It is suitable for extrusion molding and injection molding because of its excellent properties.
  • Crosslinked product of Epikuroruhi drill Ngomu composition for forming the elastic layer in the present invention is typically a volume resistivity of cross-linked product 1 0 5 ⁇ 1 0 1 2 ⁇ cm, preferably 1 0 6 ⁇ :. L 0 1 1 ⁇ ⁇ cm, Yori preferably 1 0 7-1 0 1. '0 111.
  • the thickness of the elastic layer is not particularly limited, and the electrical resistance of the roll can be changed by changing the layer thickness.
  • the layer thickness is preferably 50 ⁇ II! ⁇ 20 mm, more preferably 1 ⁇ ⁇ ! 11 O mm, particularly preferably 200 ⁇ 5 mm. If the layer thickness is too thin, the electric resistance of the roll becomes too small, and the durability of the elastic layer may become a problem. The electric resistance of the roll becomes too high.
  • a resin layer or a rubber layer is formed as the surface layer (B) for the purpose of preventing adverse effects due to the stickiness of the roll surface.
  • a resin layer or a rubber layer having an electric resistance in a medium resistance region is preferable.
  • a crosslinked resin layer or a crosslinked rubber layer may be formed as necessary.
  • the resin constituting the surface layer is not particularly limited, and resins used as the surface layer in general medium resistance rubber rolls, for example, polyurethane resin, silicone resin, polyamide resin, polyester resin, Examples include polyimide resin and fluorine resin.
  • the polyurethane resin used as the resin constituting the surface layer is a reaction product of a polyfunctional isocyanate compound and a polyether polyol or a polyester polyol.
  • This polyurethane resin may have a hydrophilic functional group in the molecular chain, and if it has a hydrophilic functional group, a dispersion used for forming the surface layer is prepared using water. It becomes easier.
  • silicone resin examples include those having a methyl group or a phenyl group in a side chain, those modified with an acrylic group, an epoxy group, an ester group, or the like. Can be illustrated.
  • N-methoxymethylated nylon is preferable.
  • N-methoxymethylated nylon is obtained by methoxymethylating the amide group of 6-nylon. 1Q
  • the thickness of the surface layer is preferably 5 to 300 // m, more preferably 7 to 200 ⁇ , and still more preferably 10 to 150 ⁇ m. If the layer thickness is too small, the durability against abrasion decreases, and if the layer thickness is too large, the coating is liable to crack.
  • the rubber forming the rubber layer is not particularly limited, and rubber used for forming the surface layer in a general medium-resistance rubber roll is used.
  • Synthetic rubbers such as tributadiene copolymer rubber, ethylene propylene copolymer rubber, epichlorohydrin rubber, urethane rubber, and fluoro rubber are used alone or as a blend.
  • the thickness of the surface layer is not particularly limited.
  • Volume resistivity of the surface layer in order to reduce variations in electrical resistance preferably 1 0 5 to 1 0 1 2 0 '. 01, more preferably 1 0 5 5 ⁇ :.
  • L OQ 'c nu more preferably 1 0 6 -1 0'. ⁇ ⁇ cm.
  • conductive fillers such as carbon black such as acetylene black; conductive oxides such as tin oxide and zinc oxide; and conductivity-imparting agents such as surfactants may be used. It is preferable to adjust the volume specific resistance value by adding.
  • the resin or rubber constituting the surface layer is provided with a compounding agent that causes bleeding, such as a plasticizer or a plasticizer. It is preferable not to use a softener or the like.
  • the medium-resistance rubber roll of the present invention comprises a core (A), a rubber component ( a ) containing epichlorohydrin rubber as an essential component, a low molecular weight epichlorohydrin polymer (b), and a crosslinking agent (c) in this order from the central axis. It is a multilayer having at least three elastic layers (B) and a surface layer (C) formed by crosslinking the contained epichlorohydrin rubber composition.
  • the medium resistance rubber roll shown in FIGS. 1 and 2 will be described.
  • Figure 1 D Cross-sectional view perpendicular to the axis showing an example of the medium resistance rubber roll of the present invention.
  • the core body 14 present at the center of the medium-resistance rubber roll has a perfect cylindrical shape, and the elastic layer 15 is formed in contact with the outer periphery thereof. Further, a surface layer 16 is formed on the outer periphery of the elastic layer 15.
  • an electric resistance adjusting layer may be formed between the core 14 and the elastic layer 15.
  • the method for producing the medium resistance rubber roll of the present invention is not particularly limited. An example of manufacturing a three-layer medium resistance rubber roll such as the medium resistance rubber roll shown in FIGS. 1 and 2 will be described.
  • the elastic layer (B) is formed by fixing the core body (A) in a roll mold, adding an epichlorohydrin rubber composition so as to cover the elastic layer forming surface on the outer periphery of the core body, and shaping into a roll shape. It is formed by heating and crosslinking.
  • the surface of the elastic layer (B) is polished, and then the surface layer (C) is formed on the surface of the elastic layer (B) as required for improving dimensional accuracy and adhesion.
  • the method of forming the surface layer (C) is not particularly limited.
  • the surface layer (C) is usually prepared by dissolving or dispersing a resin or rubber and a crosslinking agent in an organic solvent, water, or the like, applying this solution or dispersion to the surface of the elastic layer, drying, and then heating and crosslinking. Let it be formed.
  • the surface layer of the polyurethane resin is prepared by allowing the polyurethane resin itself to act as an emulsifier, or by applying an aqueous polyurethane resin dispersion prepared using another emulsifier to the surface of the hydrophilic layer, It may be formed by drying the water.
  • a cross-linking agent may be dispersed in this dispersion liquid, and after the moisture is dried, the cross-linking may be performed by heating. If the surface layer is formed by this method, environmental pollution is small because no organic solvent is used, and the elution of the binder from the elastic layer can be suppressed without swelling the elastic layer containing rubber.
  • Examples of the coating method include brush coating, spray spraying, and dipping, but a dip method is preferred from the viewpoint of production efficiency.
  • Examples of the drying method include methods such as natural drying and heat drying. Among them, heat drying is preferable in order to increase the uniformity of the thickness of the surface layer.
  • the cross-linking method is not particularly limited, and a cross-linking method according to the properties of the resin or rubber used, the cross-linking agent, and the like may be used.
  • the surface layer is a rubber layer, it is preferable to perform a surface treatment to reduce the friction coefficient of the surface layer. In order to perform the surface treatment, it is preferable to first appropriately polish the surface using an abrasive.
  • Examples of the surface treatment method include ultraviolet irradiation, ozone exposure, application of a reactive silicone compound, and application of a reactive fluorine compound. By performing such a surface treatment, it is possible to prevent adverse effects due to adhesion of the rubber roll surface.
  • the surface layer is a crosslinked rubber layer
  • a laminate of an epichlorohydrin rubber composition as a raw material for the elastic layer and a crosslinkable rubber composition as a raw material for the surface layer is extruded around an axis from an extruder.
  • the elastic layer and the surface layer may be simultaneously molded and cross-linked by heat-crosslinking the laminate as it is, and the surface may be polished if necessary. Simultaneous molding and simultaneous crosslinking of the elastic layer and the surface layer are preferred methods because the elastic layer and the surface layer are easily bonded.
  • the medium-resistance rubber roll of the present invention is an electrophotographic apparatus that develops an electrostatic latent image on a photosensitive drum into a visible image with toner, such as a developing roll, a charging roll or a transfer roll disposed in contact with the photosensitive drum. It is very suitable.
  • the electrophotographic apparatus of the present invention has at least one medium resistance rubber roll of the present invention out of rolls such as a charging roll, a developing roll, and a transfer roll.
  • the structure and function of the image forming apparatus of the present invention are not particularly limited.
  • the charging roll contacts the photosensitive drum to charge the surface of the photosensitive drum, and (2) the photosensitive drum is exposed by the exposure unit.
  • An electrostatic latent image is formed on the surface of the charged photosensitive drum, and (3) the developing roll comes into contact with the photosensitive drum, and the electrostatic latent image is developed into a visible image by the toner carried by the developing roll.
  • It is configured and functions to transfer voltage to printing paper by applying a voltage using a transfer roll.
  • FIG. 3 shows an example of such an electrophotographic apparatus.
  • the photosensitive drum 1 for forming an electrostatic latent image and the charging roll 10 are arranged so as to be in contact with each other, and a voltage is applied from a power source through the core of the charging roll.
  • a voltage is applied from a power source through the core of the charging roll.
  • the surface of the photosensitive drum is charged.
  • An electrostatic latent image is formed on the surface.
  • the photosensitive drum 1 is arranged so as to be in contact with the developing roll 2 as well.
  • the toner 4 is applied to the surface of the adjacent developing roll 2 by the supply roll 6.
  • the thickness of the toner applied to the surface of the developing roll is uniformly controlled by the developing blade 3.
  • the toner uniformly and uniformly applied on the surface of the developing roll visualizes the electrostatic latent image formed on the photosensitive drum surface.
  • the toner image on the photosensitive drum is generated by applying a voltage having a polarity opposite to that of the toner on the transfer roll 11 to the transfer roll 11 via a core by a power source, and generating an electric field. Transfer the toner to the transfer material 13.
  • FIG. 1 shows a so-called cleanerless system without such a cleaning device.
  • An electrophotographic apparatus is shown. Therefore, the toner remaining on the surface of the photosensitive drum comes into contact with the charging roll.
  • toner is attracted to a developing device by electrostatic force and collected by a difference between a charged surface potential of the photosensitive drum and a developing bias. That is, after the charging step is completed and before the transfer step is started, for example, the residual toner is recovered by electrostatic force generated in the developing step.
  • the core of the developing roll 2 is usually configured so that a bias voltage can be applied.
  • the transfer material is, for example, paper or an OHP sheet.
  • the reduced viscosity was measured by dissolving 1 g of the polymer in 100 ml of toluene in a constant temperature water bath at 30 ° C. using an Ostold viscometer type 0A.
  • Hardness was measured according to JISK 6253.
  • the specific volume resistance ( ⁇ ⁇ cm) was determined by preparing a 2 mm thick sheet of each material, sandwiching it between electrodes with guide rings, and applying a voltage of 500 V DC at 23 ° C and 50 ° C. % Measured at RH.
  • the electrical resistance ( ⁇ ) of the roll is determined by using a stainless steel core to create a medium-resistance rubber roll with a rubber surface length of 20 O mm, a rubber thickness of 3 mm, and a roll outer diameter of 18 xn m.
  • a 100 g brass electrode of the same length as above was placed, and a DC voltage of 500 V was applied between the electrode and the core of the medium-resistance rubber roll for measurement.
  • a commercially available photosensitive drum (made by Oki Data, for OL600E) was fixed, and a medium-resistance rubber roll was brought into contact with the photosensitive drum so that the load became 500 g. At 45 ° C. and 80% RH for 4 weeks.
  • the evaluation was performed in three stages. In the tables showing the results of the examples and the like, ⁇ ⁇ indicates that no contamination was observed after 4 weeks, and ⁇ indicates that no contamination was observed after 2 weeks.
  • X indicates that streaks are observed on the photosensitive drum, and X indicates that contamination is observed before 2 weeks have elapsed.
  • the print quality deterioration suppressing properties are as follows: ⁇ indicates that the print quality is stable even when 30,000 characters are printed, and ⁇ indicates that the print quality is reduced when 30,000 sheets are printed. However, the print quality is stable even after printing 20,000 sheets, and X indicates that the print quality deteriorates on 20,000 sheets after printing 20,000 sheets.
  • ⁇ ⁇ indicates that the photosensitive drum was worn even after 30,000 sheets were printed. ⁇ indicates that there is no effect due to wear, and ⁇ indicates that the effect due to the wear of the photosensitive drum is observed when 30,000 sheets are printed, but even if 20,000 sheets are printed, the effect due to the wear of the photosensitive drum occurs on 20,000 sheets. X indicates that 20,000 sheets have been printed, and a reduction in print quality due to wear of the photosensitive drum is observed on the 20,000th sheet.
  • the print density under the low temperature and low humidity LZL environment (10 ° C, 20% RH) was also evaluated. Evaluation of LZL print density was performed by measuring “black solid portion” using a Macbeth reflection densitometer. ⁇ indicates that the print density is 1.3 or more, and X indicates that the print density is less than 1.3.
  • Epichlorohydrin rubber A is composed of epichlorohydrin units Z arylglycidyl ether units / ethylene oxide units in a molar ratio of 40/4 /
  • the mixture was kneaded with a roll to prepare a rubber composition as an elastic layer material.
  • the compounding materials that are not described above are as follows. Atari lonitrile butadiene copolymer rubber: Nippon Zeon, Nipo 110
  • Ethylene-propylene-gene rubber Mitsui Petrochemical Co., Ltd., EP3042E, liquid athali-lonitrile butadiene copolymer rubber: Nippon Zeon, Nipo 11
  • Paraffin oil Idemitsu Kosan, Diana Process PW-90,
  • Ketjen black Ketjen black E C
  • the rubber composition of the elastic layer material was formed into a sheet and crosslinked at 155 ° C. for 30 minutes to obtain a crosslinked rubber sheet having a thickness of 2 mm.
  • Table 1 shows the results obtained by measuring the hardness and the specific volume resistance as the elastic layer rubber characteristics using the obtained crosslinked rubber sheets.
  • the medium-resistance rubber roll was manufactured by laminating an elastic layer on a core body and further laminating a surface layer as follows.
  • the elastic layer is made of stainless steel, the entire length of which is 2 63 mm, the length of the elastic layer forming section is 2 27 mm, and the outer diameter is 10 mm.
  • the rubber composition was put therein, shaped into a roll around the core, and then heated to crosslink. After the cross-linking molding, the surface of the obtained rubber roll was polished using a grindstone, and the surface of the grindstone was polished until the 10-point average roughness Rz became 10 ⁇ m or less.
  • the surface layer was formed by the following methods (1) to (4).
  • Crosslinkable polyurethane resin composition manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., Superflex 126) Aqueous dispersion (solids concentration: 20 parts by weight) 80 parts by weight and tin oxide 20 parts by weight Part into a ball mill pot, disperse well, and a roll with an elastic layer formed on this dispersion Was immersed, dried, and then heat-treated at 150 ° C. for 10 minutes to form a 50 ⁇ m-thick crosslinked polyurethane resin surface layer.
  • “PU” is written in the column of surface layer material, indicating that the surface layer of the urethane resin was provided.
  • a sheet with a thickness of 2 mm was prepared using the same material as the surface layer and under the same cross-linking conditions.
  • the material properties of the surface layer were determined as volume resistivity ( ⁇ ⁇ cm).
  • the elastic layer thickness, surface layer thickness, roll surface hardness, roll electrical resistance, L / L print density, photosensitive drum contamination suppression, photosensitive drum Tables 1 and 2 show the results of measurement or evaluation of the ram abrasion control, print quality deterioration control, and roll change.
  • the elastic layer had a hardness of 30 or less in hardness
  • the surface of the roll provided with the surface layer had a hardness of 40 or less
  • the electrical resistance of the roll was an appropriate resistance value. Is shown. There is no contamination of the photosensitive drum in the durability test as a developing roll, and the durability in the continuous printing test is excellent. Also, under low temperature and low humidity (LZL)

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Laminated Bodies (AREA)
  • Dry Development In Electrophotography (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Cylindre revêtu de caoutchouc à résistance électrique moyenne (ayant une résistivité volumique de 10?6 à 1012¿ Φ.cm), qui comporte (A) un corps central, (B) une couche élastique préparée par polymérisation d'une composition caoutchouteuse à base d'épichlorhydrine contenant (a) un caoutchouc à base d'épichlorhydrine, (b) un polymère à base d'épichlorhydrine de faible poids moléculaire et (c) un agent de réticulation, et (C) une couche de surface, les éléments (A), (B) et (C) étant disposés dans cet ordre depuis l'axe central du cylindre. La présente invention concerne également un dispositif électrophotographique comportant ledit cylindre.
PCT/JP1999/001382 1998-03-19 1999-03-19 Cylindre revetu de caoutchouc a resistance electrique moyenne et dispositif electrophotographique WO1999047823A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9090198A JP3726862B2 (ja) 1998-03-19 1998-03-19 半導電性ゴムロールおよび画像形成装置
JP10/90901 1998-03-19

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Publication Number Publication Date
WO1999047823A1 true WO1999047823A1 (fr) 1999-09-23

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JP (1) JP3726862B2 (fr)
WO (1) WO1999047823A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105437817A (zh) * 2015-12-21 2016-03-30 无锡科莱欣机电制造有限公司 一种印染机用耐磨损胶辊套
CN105437816A (zh) * 2015-12-21 2016-03-30 无锡科莱欣机电制造有限公司 一种印染机用印染胶辊套

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4034595B2 (ja) * 2002-05-27 2008-01-16 住友ゴム工業株式会社 ゴムロール
JP2004061639A (ja) * 2002-07-25 2004-02-26 Canon Inc 帯電部材及び該帯電部材を用いた電子写真装置
JP5164326B2 (ja) * 2005-12-14 2013-03-21 キヤノン株式会社 ゴム組成物、これを用いた導電性部材、及び導電性ローラーの製造方法
JP4820657B2 (ja) * 2006-02-10 2011-11-24 東海ゴム工業株式会社 現像ロールおよびその製法
JP5021354B2 (ja) * 2006-04-28 2012-09-05 住友ゴム工業株式会社 ゴム部材および該ゴム部材からなる現像ローラ
JP5334092B2 (ja) * 2007-05-09 2013-11-06 シンジーテック株式会社 導電性ゴム部材及びその製造方法
JP2011022286A (ja) * 2009-07-14 2011-02-03 Bridgestone Corp 導電性ローラ
JP6056705B2 (ja) * 2013-08-14 2017-01-11 富士ゼロックス株式会社 帯電ロール、帯電装置、プロセスカートリッジ、画像形成装置、および帯電ロールの製造方法
WO2018230320A1 (fr) * 2017-06-16 2018-12-20 株式会社大阪ソーダ Polymère de polyéther

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH0815951A (ja) * 1994-06-28 1996-01-19 Tokai Rubber Ind Ltd 帯電ロール
JPH09297454A (ja) * 1996-05-01 1997-11-18 Ricoh Co Ltd 画像形成装置の帯電ローラ及びその製造方法
JPH09325576A (ja) * 1996-05-31 1997-12-16 Ricoh Co Ltd 帯電部材およびそれを用いた帯電装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0815951A (ja) * 1994-06-28 1996-01-19 Tokai Rubber Ind Ltd 帯電ロール
JPH09297454A (ja) * 1996-05-01 1997-11-18 Ricoh Co Ltd 画像形成装置の帯電ローラ及びその製造方法
JPH09325576A (ja) * 1996-05-31 1997-12-16 Ricoh Co Ltd 帯電部材およびそれを用いた帯電装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105437817A (zh) * 2015-12-21 2016-03-30 无锡科莱欣机电制造有限公司 一种印染机用耐磨损胶辊套
CN105437816A (zh) * 2015-12-21 2016-03-30 无锡科莱欣机电制造有限公司 一种印染机用印染胶辊套

Also Published As

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JP3726862B2 (ja) 2005-12-14
JPH11272043A (ja) 1999-10-08

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