WO2011074610A1 - 導電性ローラおよびその製造方法 - Google Patents
導電性ローラおよびその製造方法 Download PDFInfo
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- WO2011074610A1 WO2011074610A1 PCT/JP2010/072571 JP2010072571W WO2011074610A1 WO 2011074610 A1 WO2011074610 A1 WO 2011074610A1 JP 2010072571 W JP2010072571 W JP 2010072571W WO 2011074610 A1 WO2011074610 A1 WO 2011074610A1
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- WIPO (PCT)
- Prior art keywords
- elastic layer
- water
- surface layer
- coating material
- layer
- Prior art date
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Classifications
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- 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
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- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/32—Wheels, pinions, pulleys, castors or rollers, Rims
- B29L2031/324—Rollers or cylinders having an axial length of several times the diameter, e.g. embossing, pressing or printing
- B29L2031/326—Rollers or cylinders having an axial length of several times the diameter, e.g. embossing, pressing or printing made wholly of plastics
Definitions
- the present invention relates to a conductive roller (hereinafter, also simply referred to as “roller”) and a method for manufacturing the same, and more specifically, various uses such as development, charging, and transfer (toner supply and cleaning) in an image forming apparatus using an electrophotographic system.
- the present invention relates to a conductive roller suitable as a developing roller or a charging roller and a method for manufacturing the same.
- a transfer roller In general, in an image forming apparatus using an electrophotographic system such as a copying machine, a printer, and a facsimile machine, a transfer roller, a developing roller, a toner supply roller, a charging roller, a cleaning roller, an intermediate transfer roller, and a belt are used in each image forming process.
- roller member used as a developing roller a charging roller, a transfer roller (toner supply, cleaning) or the like, a conductive rubber or a polymer provided with conductivity by blending a conductive agent on the outer periphery of the shaft.
- a coating film of one or more layers of water-based paint is provided on the outer periphery. Things are used.
- Patent Document 1 the rate of mass change due to water absorption accompanying an environmental change from 23 ° C. and 50% relative humidity to 95 ° C. relative humidity of the material forming the surface layer is defined as 3.0% or less.
- a charging member has been proposed.
- Patent Document 2 for the purpose of obtaining stable conductivity without being affected by temperature and humidity, conductive fibers are planted on a base material through an adhesive layer, and the conductive fibers are electrically conductive.
- a conductive member having a structure in which a polymer layer and a moisture retention layer are laminated is disclosed.
- Patent Document 1 since only the water absorption rate of the surface layer is defined, the high temperature and high humidity environment is considered, but the application until the water-based paint is applied and dried is applied. It was not possible to sufficiently suppress dripping due to. Furthermore, since the technique described in Patent Document 2 is provided with conductive fibers on the surface layer of the conductive member, the temperature and humidity of the outside air are taken into account, but the water-based paint is also applied and dried. It was not possible to sufficiently suppress the liquid dripping due to the application up to this point.
- synthetic fine powder silica, organic bentonite, metal soap, white carbon, fatty acid amide, etc. are used in solvent-based paints, bentonite, methylcellulose, polyvinyl alcohol, etc. in water-based paints
- dripping is prevented by making the viscosity thixotropic, but even when using such a method, when applying water-based paint repeatedly several times, A sufficient dripping prevention effect could not be obtained.
- an object of the present invention is to provide a conductive roller and a method for manufacturing the same, in which dripping due to a paint, particularly a water-based paint, is suppressed during manufacture.
- the present inventors have found that by using a paint containing a liquid absorbing agent for the elastic layer, it is possible to suppress the occurrence of dripping at the time of applying the surface layer.
- the invention has been completed.
- the conductive roller of the present invention is a conductive roller comprising a shaft, at least one elastic layer formed on the outer periphery of the shaft, and a surface layer formed on the outer peripheral surface of the elastic layer.
- the elastic layer is formed using an elastic layer coating material containing a liquid absorbing agent, and the surface layer is formed using a surface layer coating material.
- the conductive roller of the present invention preferably has two or more elastic layers, and each elastic layer is formed by using an elastic layer coating material containing a liquid absorbing agent. Furthermore, in the present invention, it is preferable that both the elastic layer coating material and the surface layer coating material include a water-based coating material. Furthermore, the liquid absorbing agent is preferably hydrophilic silica or a water-absorbing polymer, and the surface coating material preferably contains a water resistant agent.
- the method for producing a conductive roller of the present invention includes an elastic layer forming step (A) in which an elastic layer coating material containing a liquid absorbing agent is applied to the outer periphery of a shaft, and dried to form an elastic layer; After the elastic layer forming step (A), a surface layer forming step (B) is performed, in which a surface layer coating material is applied on the formed elastic layer and dried to form a surface layer. .
- the method for producing a conductive roller of the present invention it is preferable to repeat the elastic layer forming step (A). Furthermore, it is preferable to use a paint containing a water-based paint as the elastic layer paint and the surface layer paint. Furthermore, it is preferable to use hydrophilic silica or a water-absorbing polymer as the liquid-absorbing agent, and it is preferable that the surface coating material contains a water-resistant agent.
- FIG. 1 is a cross-sectional view showing an example of a conductive roller according to a preferred embodiment of the present invention.
- the conductive roller 10 of the present invention includes a shaft 1, at least one elastic layer 2 formed on the outer periphery of the shaft 1, and a surface layer 3 formed on the outer peripheral surface thereof.
- the elastic layer 2 means a layer between the surface layer 3 and the shaft 1 and includes a layer such as a resistance adjusting layer containing a conductive agent or an adhesive layer for adhesion. It is a concept.
- a water-based paint composition containing a water-based paint is used as a paint will be described as an example.
- the elastic layer 2 is formed using an elastic layer aqueous coating composition containing a water-absorbing agent
- the surface layer 3 is formed using a surface layer aqueous coating composition. It is important.
- both the elastic layer 2 and the surface layer 3 are formed by applying a water-based coating composition and then drying, but when the water-based coating composition is repeatedly applied in the present invention, it is a lower layer of the surface layer 3.
- the water-absorbing agent in the elastic layer 2 can absorb the water in the surface layer 3, so that the apparent drying speed of the surface layer 3 is increased and the formation of the surface layer 3 is increased. It can prevent dripping of paint at the time.
- the elastic layer 2 may have at least one layer, but may have two or more elastic layers.
- it is essential to use a water-based coating composition containing a water-absorbing agent for at least the elastic layer 2 in direct contact with the surface layer 3, but any elastic layer is formed using a water-based coating composition containing a water-absorbing agent. It is preferable to be made.
- FIG. 2 is a cross-sectional view showing another example of a conductive roller according to a preferred embodiment of the present invention.
- the conductive roller 20 has two elastic layers 2a and 2b.
- the elastic layer 2a which is the lower layer of the surface layer 3
- a water absorbing agent that absorbs moisture.
- a water absorbing agent is also blended in the elastic layer 2b.
- the elastic layer immediately below the surface layer contains a water absorbing agent. It is preferable that a water-absorbing agent is also blended in the elastic layer on the lower layer side other than that.
- the layer formed by drying the coating composition for the elastic layer having completely the same component continuously and repeatedly after application is a single elastic layer, and the aqueous coating composition for the elastic layer having different components.
- the layer formed by drying after applying the composition is used as another elastic layer.
- the method for producing a conductive roller according to the present embodiment includes an elastic layer forming step (A) in which a water-based coating composition for an elastic layer containing a water-absorbing agent is applied to the outer periphery of a shaft, and the elastic layer is formed by drying.
- a surface layer forming step (B) is performed in which the surface layer aqueous coating composition is applied onto the formed elastic layer and dried to form a surface layer.
- the elastic layer 2 as the lower layer is formed by applying and drying the water-based coating composition for the elastic layer containing the water-absorbing agent, so that the apparent drying speed of the surface layer 3 as the upper layer is increased. It is possible to prevent the dripping of the paint when forming. Furthermore, since a water absorbing agent is blended in the elastic layer 2 that is in direct contact with the surface layer 3, moisture does not come out on the surface of the surface layer 3, so that the conductive roller does not stick to the photoreceptor or the like even under high temperature and high humidity. As a result, the surface layer 3 is not peeled off, and a good image without unevenness can be obtained.
- the method for manufacturing the conductive roller of the present embodiment it is preferable to repeat the elastic layer forming step (A).
- An elastic layer having a sufficient thickness can be obtained by using a water-based coating composition for an elastic layer having completely the same component and drying it after repeated application to form a layer.
- the electroconductive roller which has two or more elastic layers can be obtained by using the water-system coating composition for elastic layers from which a component differs, and drying after application
- the number of repetitions of the elastic layer forming step (A) is not particularly limited, but is preferably 2 to 9 times, more preferably 3 to 8 times, and further preferably 4 to 7 times. By setting it as this range, an elastic layer with a favorable film thickness can be formed.
- the water-absorbing agent is particularly selected as long as it can absorb the moisture in the upper surface layer 3 by blending it with the lower elastic layer 2 to increase the apparent drying speed of the surface layer 3.
- silica or a water-absorbing polymer is preferable.
- Hydrophobic silica such as silylated silica (manufactured by Nippon Aerosil Co., Ltd.) can be used as the silica, but hydrophilic silica is more preferred, and as such hydrophilic silica, Fine Seal X-12 (Co., Ltd.) is used. Tokuyama) and the like.
- the film thickness of 70-100 ⁇ m per dipping coating was the limit, but water for elastic layers containing hydrophilic silica was added.
- the surface layer can be formed to a thickness of 100 to 200 ⁇ m by applying the surface coating composition to the elastic layer and applying the surface layer water-based coating composition to the surface layer.
- the blending amount of the hydrophilic silica is preferably 1 to 50 parts by mass with respect to 100 parts by mass of the water-based paint contained in the paint of the elastic layer 2. If the blending amount of hydrophilic silica is too small, there is a possibility that sufficient water absorption effect cannot be obtained. On the other hand, if the blending amount of hydrophilic silica exceeds 50 parts by mass, a good film may not be formed.
- the water-absorbing polymer is not particularly limited as long as it is excellent in water-absorbing property, but is obtained by slightly cross-linking an electrolyte polymer having an ionic group or a hydrophilic polymer having a hydroxyl group. Thus, it has the ability to absorb and retain water 50 to 1000 times its own weight.
- Examples of the water-absorbing polymer used in the present embodiment include those obtained by polymerizing the following hydrophilic polymers. 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, glycerol (meth) acrylate, 2-acrylamido-2-methylpropanesulfonic acid, sodium ethyl sulfonate (meth) acrylate, (meth) acrylamide, N , N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, N-isopropylacrylamide, N, N-dimethylaminopropylacrylamide, 2-methacryloxyethyltrimethylammonium chloride, (meth) acrylic acid , Sodium (meth) acrylate, 2- (meth) acryloyloxyethyl succinic acid, 2- (meth) acryloyloxyethyl
- the water-absorbing polymer may be a homopolymer composed of one of the hydrophilic polymers, or may be a copolymer of two or more of the hydrophilic polymers.
- the copolymer of 1 type (s) or 2 or more types of an organic polymer and 1 type (s) or 2 or more types of another monomer may be sufficient.
- this other monomer is a hydrophobic monomer such as styrene or (meth) acrylic acid ester, it is necessary to set the copolymerization ratio within a range in which the hydrophilicity and water absorption are not lost.
- the water-absorbing polymer may be modified within a range that does not impair the effects of the present invention, and may be modified by a monomer or oligomer having two or more reactive functional groups as long as the hydrophilicity and water absorption are not lost. It may be cross-linked.
- the elastic layer 2 only 1 type of a water absorbing polymer may be used, and 2 or more types may be used.
- such a water-absorbing polymer is produced as fine particles having a particle diameter of about 10 to 1000 ⁇ m, and therefore, such a fine-particle water-absorbing polymer can be used as it is in the present invention.
- water-absorbing polymer examples include 10SH-NF (acrylic acid polymer partial sodium salt crosslinked product, manufactured by Sumitomo Seika Co., Ltd.).
- the blending amount of the water-absorbing polymer is preferably 0.1 to 3.0 parts by mass with respect to 100 parts by mass of the water-based paint contained in the paint of the elastic layer 2. There exists a possibility that sufficient water absorption effect may not be acquired as the compounding quantity of a water absorbing polymer is less than 0.1 mass part. On the other hand, if the blending amount of the water-absorbing polymer exceeds 3.0 parts by mass, a good film may not be formed.
- the water-based coating composition for the surface layer contains a waterproofing agent.
- a waterproofing agent since absorption of the water in the surface layer 3 can be prevented, influences, such as humidity in air
- the water-proofing agent is not particularly limited as long as it can be blended in the paint and can prevent water absorption in the surface layer 3, and examples thereof include ammonium zirconium carbonate.
- the blending amount of the water-resistant agent is preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of the water-based paint contained in the surface layer 3 paint. There exists a possibility that sufficient water resistance cannot be acquired as the compounding quantity of a water-resistant agent is less than 0.1 mass part. On the other hand, if the blending amount of the water-resistant agent exceeds 10 parts by mass, a good film may not be formed.
- the difference between the paint that can be used in the elastic layer 2 and the paint that can be used in the surface layer 3 is only different in that the paint that can be used in the elastic layer 2 must contain a liquid absorbent,
- the following water-based paint compositions can be used, respectively, and the paint that can be used for the elastic layer 2 and the paint that can be used for the surface layer 3 may have the same composition or may be different.
- the influence on the environment can be extremely reduced as compared with the solvent system.
- any one or two or more selected from the group consisting of rubber-based, urethane-based, and acrylic-based materials can be suitably used.
- rubber type natural rubber (NR), chloroprene rubber (CR), nitrile rubber (NBR), latex such as styrene butadiene rubber (SBR), etc.
- urethane type emulsion and dispersion
- ether type emulsion
- ester type styrene butadiene rubber
- acrylic an emulsion such as acrylic or acrylic styrene can be suitably used.
- the water-based paint that can be used in the present embodiment is preferably a water-based acrylic resin.
- aqueous acrylic resin those containing acrylonitrile and n-butyl acrylate as essential components and optionally containing other monomers are preferable.
- examples of other monomers include ethyl acrylate, 2-ethylhexyl acrylate, acrylic acid, Examples include methacrylic acid.
- acrylonitrile and n-butyl acrylate are essential components is that they contribute to the improvement of elasticity (set property). From this viewpoint, the amount of n-butyl acrylate is increased as much as possible, and other components are added.
- the monomer ratio of other monomer components other than the essential components is preferably in the range of 1 to 25:99 to 75, particularly 5 to 20:95 to 80 in terms of molar ratio.
- the water-based acrylic resin contains a group having active hydrogen in the molecule.
- the group having active hydrogen include a carboxyl group, a hydroxyl group, and an amino group, and a carboxyl group is preferable.
- the ratio of the monomer containing the group having active hydrogen is preferably in the range of 3 to 6% of the total monomer amount.
- a water-based acrylic resin having a surface acid value adjusted to 10 mg / g or more, for example, 10 to 20 mg / g is preferably used by setting the ratio of the monomer containing a group having active hydrogen within this range. be able to.
- water-based paint examples include an aqueous emulsion of acrylonitrile-alkyl acrylate ester-methacrylic acid-glycidyl methacrylate copolymer (manufactured by High Pressure Gas Industry Co., Ltd., crosslinking temperature 130 ° C.), EAU363B.
- a conductive agent can be appropriately added to the paint to impart conductivity.
- the conductive agent include an ionic conductive agent and an electronic conductive agent.
- the ionic conductive agent include tetraethylammonium, tetrabutylammonium, dodecyltrimethylammonium (for example, lauryltrimethylammonium), hexadecyltrimethylammonium, and octadecyltrimethyl.
- Perchlorates such as ammonium (eg stearyltrimethylammonium), benzyltrimethylammonium, modified fatty acid dimethylethylammonium, chlorate, hydrochloride, bromate, iodate, borofluoride, sulfate, ethyl Ammonium salts such as sulfates, carboxylates and sulfonates, perchlorates, chlorates, hydrochlorides and odors of alkali metals and alkaline earth metals such as lithium, sodium, potassium, calcium and magnesium Salts, iodate salts, fluoroboric acid salts, trifluoromethyl sulfate, and sulfonic acid salts.
- ammonium eg stearyltrimethylammonium
- benzyltrimethylammonium modified fatty acid dimethylethylammonium
- chlorates such as sodium, potassium, calcium and magnesium Salts, iodate salts, fluoroboric acid salts
- Examples of the electronic conductive agent include conductive carbon such as ketjen black and acetylene black; carbon for rubber such as SAF, ISAF, HAF, FEF, GPF, SRF, FT, and MT; for ink subjected to oxidation treatment Examples thereof include carbon, pyrolytic carbon, natural graphite, and artificial graphite; conductive metal oxides such as tin oxide, titanium oxide, and zinc oxide; metals such as nickel, copper, silver, and germanium. These conductive agents may be used alone or in combination of two or more.
- the blending amount is not particularly limited and can be appropriately selected as desired. For example, the blending amount is 1 to 20 parts by mass with respect to 100 parts by mass of the resin component constituting the elastic layer 2 and the surface layer 3. it can.
- resin microballoons cross-linking agents, vulcanizing agents, vulcanization accelerators, anti-aging agents, and the like can be added to the elastic layer 2 and surface layer 3 as required.
- the coating method for forming the elastic layer 2 and the surface layer 3 is not particularly limited.
- the coating material is prepared, and the coating material is prepared by dipping, spraying, roll coater.
- a method of applying to the shaft 1 and drying and solidifying by a method, a die coating method or the like is adopted, and a dipping method is particularly preferably used.
- the thickness of the elastic layer 2 is set to 0.05 to 0.1 mm, particularly 0.06 to 0.09 mm, by repeating the elastic layer forming process once or twice.
- the thickness of the elastic layer 2 can be reduced to 0.5 to 0.7 mm by repeating the elastic layer forming step 7 to 8 times.
- the shaft 1 is made of metal or plastic, and can be a hollow cylinder or a solid cylinder, and is preferably a metal hollow cylinder or a solid cylinder. More preferably, it is a metal hollow cylinder. As a result, the cost can be further reduced.
- the thickness of the surface layer 3 is set according to the form of the conductive roller 10 and the like, and is not particularly limited, but can be normally 100 to 200 ⁇ m, particularly 120 to 150 ⁇ m.
- FIG. 3 is a cross-sectional view showing still another example of the conductive roller according to the preferred embodiment of the present invention.
- the central portion in the length direction is more than the end portion. It has a crown shape with a large diameter.
- the crown amount representing the degree of protrusion when the center in the length direction protrudes from the end is preferably 50 to 100 ⁇ m. Can be made even better.
- the crown amount is less than 50 ⁇ m, the contact pressure at the central portion in the roller length direction becomes low.
- the crown amount exceeds 100 ⁇ m the central portion in the roller length direction is too much in contact. In either case, the charge amount may be non-uniform.
- the crown amount of the conductive roller in the present invention was measured using a high-precision laser measuring machine LSM-430v manufactured by Mitutoyo Corporation.
- the outer diameter is measured at the center of the roller and at the position of 90 mm from the center to the end, and the difference between the outer diameter of the center and the average value of the outer diameter at each position of 90 mm in the direction of both ends is calculated.
- the deflection (film thickness accuracy) of the conductive rollers 10, 20, and 30 is 70 ⁇ m or less in the entire region in the roller length direction.
- the conductive rollers 10, 20, 30 are used as charging rollers and are rotated while being in contact with the photosensitive member, if the conductive rollers 10, 20, 30 are shaken greatly, the conductive rollers 10, 20, 30 and the photosensitive rollers are photosensitive. A gap is created between the body and the body. In addition, the gap distance varies. In this case, the toner particles and the external additive remaining on the photosensitive member are liable to enter the gap, and adhere to the surfaces of the conductive rollers 10, 20, and 30 as unevenness. Therefore, the surface of the roller becomes mottled and causes image defects.
- the deflection of the conductive rollers 10, 20, and 30 was measured using a high-precision laser measuring machine LSM-430v manufactured by Mitutoyo Corporation. With this measuring machine, the outer diameter was measured for each of the five points in the roller length direction, and the average value of the difference between the maximum value and the minimum value of the outer diameter measured for each point was taken as the shake.
- the elastic layer 2 is formed using a solvent-based coating composition for elastic layers containing a liquid absorbing agent
- the surface layer 3 is formed using a solvent-based coating composition for surface layers.
- the liquid absorbing agent in the elastic layer 2 can absorb the moisture in the surface layer 3 by blending the liquid absorbing agent that absorbs the solvent into the elastic layer 2 that is the lower layer of the surface layer 3. The drying speed is increased, and the dripping of the paint during the formation of the surface layer 3 can be prevented.
- Examples of the solvent-based paint in the present invention include those obtained by dissolving a urethane resin in a solvent such as methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and toluene and adding an isocyanate-based curing agent.
- a solvent such as methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and toluene and adding an isocyanate-based curing agent.
- Example 1 In accordance with the formulation shown in Table 1 below, water-based paint (acrylonitrile-acrylic acid alkyl ester-methacrylic acid-glycidyl methacrylate aqueous emulsion), Epocross (an oxazoline group-containing styrene-acrylic copolymer emulsion), water Dispersed carbon, fine seal X-12 (hydrophilic silica), SN deformer 777 (antifoaming agent), SN wet 970 (wetting agent), and UH420 (thickening agent) were blended and stirred with a stirrer.
- water-based paint acrylonitrile-acrylic acid alkyl ester-methacrylic acid-glycidyl methacrylate aqueous emulsion
- Epocross an oxazoline group-containing styrene-acrylic copolymer emulsion
- water Dispersed carbon fine seal X-12 (hydrophilic silica)
- the water-based paint containing each component was filtered through a mesh to remove aggregates.
- the obtained water-based paint was applied to a metal shaft by dipping and dried at room temperature for 30 minutes and at 110 ° C. for 20 minutes to form an elastic layer.
- the elastic layer was applied and dried once.
- water-based paint (acrylonitrile-acrylic acid alkyl ester-methacrylic acid-glycidyl methacrylate aqueous emulsion), Epocross (an oxazoline group-containing styrene-acrylic copolymer emulsion), water Dispersed carbon, AZ coat 5800MT (ammonium zirconium carbonate), SN deformer 777 (antifoaming agent), SN wet 970 (wetting agent), and UH420 (thickening agent) were blended and stirred with a stirrer.
- the water-based paint containing each component was filtered through a mesh to remove aggregates.
- the obtained water-based paint was applied on the elastic layer by dipping and dried at room temperature for 30 minutes and at 110 ° C. for 20 minutes to form a surface layer, whereby the conductive roller shown in FIG. 1 was obtained.
- Example 2 and 3 and Comparative Examples 1 and 2 A conductive roller was obtained in the same manner as in Example 1 except that the formulation described in Table 1 was followed.
- Example 3 both the elastic layer and the surface layer are blended with a hydrophobic solvent-based paint, and silylated silica functions as a liquid absorbent that absorbs the hydrophobic solvent.
- the thickness of the elastic layer and the surface layer and the presence or absence of dripping were measured using a high-precision laser measuring machine LSM-430v manufactured by Mitutoyo Corporation. The presence or absence of dripping was determined based on the measured shape.
- the thicknesses of the elastic layer and the surface layer, the total film thickness, and the presence or absence of dripping are shown in Table 1 below. Further, the total film thickness (high temperature and high humidity film thickness) after being left for 1 day under high temperature and high humidity of 40 ° C. and 95 RH% was measured using a high precision laser measuring machine LSM-430v manufactured by Mitutoyo Corporation.
- film thickness ratio The ratio of the high-temperature high-humidity film thickness to the initial total film thickness (film thickness ratio) was determined, and the results are shown in Table 1, respectively. If the film thickness ratio is 1.05 or less, the conductive roller does not stick to the photoreceptor or the like even under high temperature and high humidity, and the result is good.
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Abstract
Description
前記弾性層が、吸液剤を含有する弾性層用塗料を用いて形成されてなり、かつ、前記表層が、表層用塗料を用いて形成されてなることを特徴とするものである。
前記弾性層形成工程(A)後、形成された前記弾性層上に表層用塗料を塗布し、乾燥して表層を形成する表層形成工程(B)と、を有することを特徴とするものである。
図1は、本発明の好適実施形態に係る導電性ローラの一例を示す断面図である。本発明の導電性ローラ10は、シャフト1と、該シャフト1の外周に形成された少なくとも1層の弾性層2と、その外周面に形成された表層3と、を備えるものである。なお、本発明において、弾性層2とは、表層3とシャフト1との間にある層を意味し、導電剤を含む抵抗調整層、あるいは、接着を目的とする接着層等の層をも含む概念である。以下の実施形態では、塗料として水系塗料を含む水系塗料組成物を用いた場合を例にとって説明する。
クラウン量(μm)={B-(A+C)/2}×1000 (1)
で求めることができる。
(実施例1)
下記表1記載の配合処方に従い、水系塗料(アクリロニトリル-アクリル酸アルキルエステル-メタクリル酸-メタクリル酸グリシジル共重合物の水性エマルション)に、エポクロス(オキザゾリン基含有スチレン-アクリル共重合物のエマルション)、水分散カーボン、ファインシールX-12(親水性シリカ)、SNデフォーマー777(消泡剤)、SNウェット970(湿潤剤)、UH420(増粘剤)を配合し、撹拌機で撹拌した。各成分を配合した水系塗料をメッシュでろ過し、凝集物を取り除いた。得られた水系塗料をディッピングにより金属製シャフトに塗装し、室温で30分間、110℃で20分間乾燥して、弾性層を形成した。この弾性層の塗布、乾燥工程は1回行った。
下記表1記載の配合処方に従った以外は、実施例1と同様にして導電性ローラを得た。なお、実施例3は、弾性層、表層ともに疎水性溶剤系塗料の配合であり、シリル化シリカが疎水性溶剤を吸収する吸液剤として機能している。
弾性層および表層の膜厚および液だれの有無を、ミツトヨ(株)製の高精度レーザ測定機LSM-430vを用いて測定した。液だれの有無は、測定された形状に基づき判定した。弾性層および表層の膜厚、これらの合計膜厚および液だれの有無の結果を、下記表1に併記した。また、40℃、95RH%の高温高湿下に1日放置後の合計膜厚(高温高湿膜厚)を、ミツトヨ(株)製の高精度レーザ測定機LSM-430vを用いて測定し、初期の合計膜厚に対する高温高湿膜厚の比(膜厚比)を求めて、結果をそれぞれ表1に併記した。なお、膜厚比が1.05以下であれば、高温高湿下でも感光体等に導電性ローラが貼りつかず、結果は良好といえる。
*2:オキザゾリン基含有スチレン-アクリル共重合物のエマルション(日本触媒(株)製)
*3:水分散カーボン(御国色素(株)製)
*4:親水性シリカ((株)トクヤマ製)
*5:アクリル酸重合体部分ナトリウム塩架橋物(住友精化(株)製)
*6:消泡剤(サンノプコ(株)製)
*7:湿潤剤(サンノプコ(株)製)
*8:増粘剤((株)ADEKA製)(表中の「%」は、「質量%」を意味する)
*9:アクリルウレタン樹脂(亜細亜工業(株)製)
*10:ヘキサンジイソシアネートトリマー(亜細亜工業(株)製)
*11:シリル化シリカ(日本アエロジル(株)製)
*12:メチルシクロヘキサン(関東化学(株)製)
*13:炭酸ジルコニウムアンモニウム(サンノプコ(株)製)
2 弾性層
3 表層
10,20,30 導電性ローラ
Claims (10)
- シャフトと、該シャフトの外周に形成された少なくとも1層の弾性層と、該弾性層の外周面に形成された表層と、を備える導電性ローラにおいて、
前記弾性層が、吸液剤を含有する弾性層用塗料を用いて形成されてなり、かつ、前記表層が、表層用塗料を用いて形成されてなることを特徴とする導電性ローラ。 - 前記弾性層を2層以上有し、いずれの弾性層も吸液剤を含有する弾性層用塗料を用いて形成されてなる請求項1記載の導電性ローラ。
- 前記弾性層用塗料および表層用塗料が、いずれも水系塗料を含む請求項1記載の導電性ローラ。
- 前記吸液剤が、親水性シリカまたは吸水性ポリマーである請求項3記載の導電性ローラ。
- 前記表層用塗料が、耐水化剤を含有する請求項3記載の導電性ローラ。
- シャフトの外周に、吸液剤を含有する弾性層用塗料を塗布し、乾燥して弾性層を形成する弾性層形成工程(A)と、
前記弾性層形成工程(A)後、形成された前記弾性層上に表層用塗料を塗布し、乾燥して表層を形成する表層形成工程(B)と、を有することを特徴とする導電性ローラの製造方法。 - 前記弾性層形成工程(A)を繰り返し行う請求項6記載の導電性ローラの製造方法。
- 前記弾性層用塗料および表層用塗料として、水系塗料を含むものを用いる請求項6記載の導電性ローラの製造方法。
- 前記吸液剤として、親水性シリカまたは吸水性ポリマーを用いる請求項8記載の導電性ローラの製造方法。
- 前記表層用塗料に耐水化剤を含有させる請求項8記載の導電性ローラの製造方法。
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