WO2020110686A1 - Rouleau de développement, dispositif de développement et dispositif de formation d'image - Google Patents

Rouleau de développement, dispositif de développement et dispositif de formation d'image Download PDF

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Publication number
WO2020110686A1
WO2020110686A1 PCT/JP2019/044136 JP2019044136W WO2020110686A1 WO 2020110686 A1 WO2020110686 A1 WO 2020110686A1 JP 2019044136 W JP2019044136 W JP 2019044136W WO 2020110686 A1 WO2020110686 A1 WO 2020110686A1
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Prior art keywords
polyol
group
developing roller
mass
less
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PCT/JP2019/044136
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English (en)
Japanese (ja)
Inventor
慧 加藤
泰男 廣谷
寛之 高梨
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信越ポリマー株式会社
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Priority to CN201980071075.XA priority Critical patent/CN112955824B/zh
Publication of WO2020110686A1 publication Critical patent/WO2020110686A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/61—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes
    • 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

Definitions

  • the present invention relates to a developing roller, a developing device, and an image forming apparatus.
  • a developing roller used in an image forming apparatus such as a copying machine, a printer, or a facsimile adopting an electrophotographic method has a function of conveying a developer to an image carrier on which an electrostatic latent image is formed.
  • the developer transportability of the developing roller affects the quality of the image forming apparatus, especially the print density. Therefore, it has been studied to form unevenness on the surface of the developing roller and adjust the electrical characteristics of various materials forming the developing roller, thereby improving the developer transportability of the developing roller.
  • the developing roller is in contact with the photosensitive drum and is rotated in the same direction while causing a speed difference, so that the toner is attached to the photosensitive drum. Therefore, if the surface of the developing roller is poorly slipped, the developing roller is repeatedly caught and released with respect to the photosensitive drum. In such a case, since toner is not uniformly supplied to the photosensitive drum, band-shaped shading, that is, banding occurs in the image.
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a developing roller, a developing device, and an image forming apparatus in which banding is suppressed well.
  • the inventors of the present invention have studied various resins used for the coating layer in order to prevent the developing roller from being caught on the photosensitive drum.
  • the present invention has been completed and the present invention has been completed.
  • the developing roller of the present invention is a developing roller including an elastic layer formed on the outer peripheral surface of a shaft and a coating layer formed on the outer peripheral surface of the elastic layer, wherein the coating layer is (a) a polyol. And (b) an isocyanate, (c) a surface roughness material, and (d) a conductive layer containing a resin composition for a coating layer, and (a) a polyol is unreacted with a (a1) side chain. And (a2) one-terminal diol type silicone oil.
  • the content of at least one of (a1) a polyol having an unreactive silicone group in a side chain and (a2) one-end diol type silicone oil in the polyol is 2% by mass or more and 60% by mass or less. Preferably.
  • polyol having an unreactive silicone group in the side chain (a1) and the (a2) one-end diol type silicone oil only the polyol having an unreactive silicone group in the side chain (a1) is included, and the (a1) side chain
  • the polyol having a non-reactive silicone group is preferably a silicone graft acrylic polyol.
  • the content of the silicone graft acrylic polyol in the (a) polyol is preferably 2% by mass or more and 40% by mass or less.
  • the developing device of the present invention includes the developing roller of the present invention.
  • the image forming apparatus of the present invention includes the developing roller of the present invention.
  • FIG. 1 is a schematic perspective view showing an embodiment of the developing roller of the present invention.
  • FIG. 2 is a schematic sectional view showing an embodiment of the image forming apparatus of the present invention.
  • FIG. 1 is a schematic perspective view showing an embodiment of the developing roller of the present invention.
  • the developing roller 1 of the present invention includes a shaft body 2, an elastic layer 3 provided on the outer circumference of the shaft body 2, and a coating layer 4 provided on the outer circumference of the elastic layer 3.
  • the configuration of the developing roller 1 of the present invention will be described.
  • the shaft body 2 As the shaft body 2, preferably, a shaft body having conductivity and used in a conventionally known developing roller can be used.
  • the shaft body 2 is preferably made of at least one metal selected from the group consisting of iron, aluminum, stainless steel, and brass, for example.
  • the shaft body 2 made of such a metal is generally known by the name of "core bar”.
  • the shaft body 2 may include an insulating resin.
  • the insulating resin may be, for example, a thermoplastic resin or a thermosetting resin.
  • the shaft body 2 may include, for example, a core body made of an insulating resin and a plating layer provided on the core body. Such a shaft body 2 can be obtained, for example, by plating a core body made of an insulating resin to make it conductive.
  • the shaft body 2 is preferably a core metal in order to obtain good conductivity.
  • the shape of the shaft body 2 is preferably, for example, a rod shape, a tubular shape, or the like.
  • the sectional shape of the shaft body 2 may be, for example, a circular shape, an elliptical shape, or a non-circular shape such as a polygonal shape.
  • the outer peripheral surface of the shaft body 2 may be subjected to treatments such as cleaning treatment, degreasing treatment, and primer treatment in order to improve the adhesiveness with the elastic layer 3.
  • the length of the shaft body 2 in the axial direction is not particularly limited, and may be appropriately adjusted according to the form of the image forming apparatus to be installed.
  • the axial length of the shaft body 2 is preferably 250 mm or more and 320 mm or less, and more preferably 260 mm or more and 310 mm or less.
  • the diameter of the shaft body 2 (diameter of the circumscribing circle) is not particularly limited, and may be appropriately adjusted according to the form of the image forming apparatus to be installed.
  • the outer diameter (diameter of the circumscribing circle) of the shaft body 2 is preferably 4 mm or more and 14 mm or less, and more preferably 6 mm or more and 10 mm or less.
  • the elastic layer 3 is formed by heating and curing the rubber composition on the outer peripheral surface of the shaft body 2.
  • the rubber composition for forming the elastic layer 3 preferably contains rubber, a conductive material, and if desired, various additives.
  • the rubber in the rubber composition examples include silicone or silicone-modified rubber, nitrile rubber, ethylene propylene rubber (including ethylene propylene diene rubber), styrene butadiene rubber, butadiene rubber, isoprene rubber, natural rubber, acrylic rubber, chloroprene rubber. , Butyl rubber, epichlorohydrin rubber, urethane rubber, fluororubber and the like. Silicone or silicone modified rubber or urethane rubber is preferable, and the silicone or silicone modified rubber can reduce compression set and is excellent in flexibility in a low temperature environment, and further has heat resistance and charging property. It is particularly preferable in that it has excellent properties.
  • silicone rubber examples include crosslinked products of organopolysiloxanes such as dimethylpolysiloxane and diphenylpolysiloxane.
  • silicone rubber composition examples include addition-curable millable conductive silicone rubber compositions and addition-curable liquid conductive silicone rubber compositions.
  • the addition-curable millable conductive silicone rubber composition may contain, for example, (A) an organopolysiloxane represented by the following average composition formula (1), (B) a filler, and (C) a conductive material. .. R 1 n SiO (4-n)/2 (1)
  • n represents a positive number of 1.95 or more and 2.05 or less.
  • R 1 represents a substituted or unsubstituted monovalent hydrocarbon group which may be the same or different.
  • the number of carbon atoms in the hydrocarbon group is preferably 1 or more and 12 or less, more preferably 1 or more and 8 or less.
  • R 1 examples include alkyl groups such as methyl group, ethyl group, propyl group, butyl group, hexyl group and dodecyl group, cycloalkyl groups such as cyclohexyl group, vinyl group, allyl group, butenyl group and hexenyl group. Examples thereof include an alkenyl group, an aryl group such as a phenyl group and a tolyl group, and an aralkyl group such as a ⁇ -phenylpropyl group. Further, R 1 may be a group in which some or all of the hydrogen atoms of these hydrocarbon groups are substituted with a substituent.
  • the substituent may be, for example, a halogen atom, a cyano group or the like.
  • Examples of the hydrocarbon group having a substituent include a chloromethyl group, a trifluoropropyl group, a cyanoethyl group and the like.
  • the organopolysiloxane (A) has a molecular chain terminal such as a trialkylsilyl group such as a trimethylsilyl group, a dialkylaralkylsilyl group such as a dimethylvinylsilyl group, a dialkylhydroxysilyl group such as a dimethylhydroxysilyl group, and a trivinylsilyl group. It is preferably blocked with a triaralkylsilyl group or the like.
  • the (A) organopolysiloxane preferably has two or more alkenyl groups in the molecule.
  • the (A) organopolysiloxane preferably has 0.001 mol% or more and 5 mol% or less (more preferably 0.01 mol% or more and 0.5 mol% or less) of alkenyl groups in R 1 .
  • the vinyl group is particularly preferable as the alkenyl group contained in the organopolysiloxane (A).
  • the (A) organopolysiloxane is obtained by, for example, subjecting one or more organohalosilanes to cohydrolysis condensation, or ring-opening polymerization of a cyclic polysiloxane such as a trimer or tetramer of siloxane. Can be obtained by The (A) organopolysiloxane may be basically a linear diorganopolysiloxane and may be partially branched. The (A) organopolysiloxane may be a mixture of two or more kinds having different molecular structures.
  • the (A) organopolysiloxane preferably has a kinematic viscosity at 25° C. of 100 cSt or more, and more preferably 100000 cSt or more and 10000000 cSt or less.
  • the degree of polymerization of the (A) organopolysiloxane is, for example, preferably 100 or more, more preferably 3000 or more and 10000 or less.
  • Examples of the filler include silica-based fillers.
  • Examples of silica-based fillers include fumed silica and precipitated silica.
  • a surface-treated silica-based filler surface-treated with a silane coupling agent represented by R 2 Si(OR 3 ) 3 can be preferably used.
  • R 2 may be a group having a vinyl group or an amino group, and may be, for example, a glycidyl group, a vinyl group, an aminopropyl group, a methacryloxy group, an N-phenylaminopropyl group, a mercapto group, or the like.
  • R 3 may be an alkyl group, for example, a methyl group, an ethyl group or the like.
  • the silane coupling agent is easily available, for example, under the trade names “KBM1003” and “KBE402” manufactured by Shin-Etsu Chemical Co., Ltd.
  • the surface-treated silica-based filler can be obtained by treating the surface of the silica-based filler with a silane coupling agent according to a standard method.
  • a commercially available product may be used as the surface-treated silica-based filler.
  • M For example, the product name “Zeothix 95” manufactured by HUBER Co., Ltd. may be mentioned.
  • the blending amount of the silica-based filler is preferably 11 parts by mass or more and 39 parts by mass or less, and more preferably 15 parts by mass or more and 35 parts by mass or less with respect to 100 parts by mass of the (A) organopolysiloxane.
  • the average particle size of the silica-based filler is preferably 1 ⁇ m or more and 80 ⁇ m or less, more preferably 2 ⁇ m or more and 40 ⁇ m or less.
  • the average particle diameter of the silica-based filler can be measured as a median diameter by using a particle size distribution measuring device using a laser light diffraction method.
  • the blending amount of the (C) conductive material is preferably 0.5 parts by mass or more, and more preferably 1 part by mass or more, relative to 100 parts by mass of the (A) organopolysiloxane. Further, the compounding amount of the (C) conductive material is preferably 15 parts by mass or less, and more preferably 10 parts by mass or less, relative to 100 parts by mass of the (A) organopolysiloxane.
  • the addition-curable millable conductive silicone rubber composition may further contain additives other than (A) to (C).
  • additives include auxiliary agents (chain extenders, crosslinking agents, etc.), catalysts, dispersants, foaming agents, antioxidants, antioxidants, pigments, colorants, processing aids, softening agents, plasticizers, Examples thereof include emulsifiers, heat resistance improvers, flame retardancy improvers, acid acceptors, thermal conductivity improvers, mold release agents and solvents.
  • the additives include (A) sealing of dimethylsiloxane oil having a lower degree of polymerization than organopolysiloxane, polyether-modified silicone oil, silanol, diphenylsilanediol and ⁇ , ⁇ -dimethylsiloxanediol at both terminal silanol groups.
  • the dispersant include low molecular weight siloxane and silane.
  • specific examples of the additives include heat resistance improvers such as iron octylate, iron oxide, and cerium oxide.
  • various carbon functional silanes, various olefin-based elastomers, etc. for improving adhesiveness, molding processability and the like may be used.
  • the addition-curable liquid conductive silicone rubber composition includes, for example, (D) an organopolysiloxane having two or more alkenyl groups in the molecule, and (E) two or more hydrogen atoms bonded to a silicon atom in the molecule.
  • the organohydrogenpolysiloxane may be included, (F) a filler, (G) a conductive material, and (H) an addition reaction catalyst.
  • R 4 a SiO 2 (4-a)/2 As the organopolysiloxane (D), compounds represented by the following average composition formula (2) are preferable.
  • a represents a positive number of 1.5 or more and 2.8 or less, preferably 1.8 or more and 2.5 or less, and more preferably 1.95 or more and 2.05 or less.
  • R 4 represents a substituted or unsubstituted monovalent hydrocarbon group which may be the same or different. However, at least two of R 4 in one molecule are alkenyl groups.
  • the number of carbon atoms in the hydrocarbon group is preferably 1 or more and 12 or less, more preferably 1 or more and 8 or less.
  • R 4 examples include the same groups as those exemplified above as R 1 .
  • the alkenyl group is preferably a vinyl group, and the alkyl group is preferably a methyl group.
  • 90% or more of R 4 may be an alkyl group (preferably a methyl group).
  • the content of alkenyl groups in the organopolysiloxane (D) is preferably 1.0 ⁇ 10 ⁇ 6 mol/g or more and 5.0 ⁇ 10 ⁇ 3 mol/g or less, and 5.0 ⁇ 10 ⁇ It is more preferably 6 mol/g or more and 1.0 ⁇ 10 ⁇ 3 mol/g or less.
  • the (D) organopolysiloxane is preferably liquid at 25° C., and the viscosity at 25° C. is preferably 100 mPa ⁇ s or more and 1,000,000 mPa ⁇ s or less, and more preferably 200 mPa ⁇ s or more and 100000 mPa ⁇ s or less. preferable.
  • the average degree of polymerization of the organopolysiloxane (D) is preferably 100 or more and 800 or less, more preferably 150 or more and 600 or less.
  • b represents a positive number of 0.7 or more and 2.1 or less
  • c represents a positive number of 0.001 or more and 1.0 or less
  • bc is 0.8 or more and 3.0 or less.
  • R 5 represents a substituted or unsubstituted monovalent hydrocarbon group which may be the same or different.
  • the number of carbon atoms in the hydrocarbon group is preferably 1 or more and 10 or less.
  • R 5 the same groups as those exemplified as the above R 1 can be exemplified.
  • the (E) organohydrogenpolysiloxane has two or more hydrogen atoms (Si-H) bonded to a silicon atom in one molecule, and preferably has three or more. Moreover, the number of hydrogen atoms bonded to silicon atoms contained in one molecule of the (E) organohydrogenpolysiloxane is preferably 200 or less, and more preferably 100 or less.
  • the content of hydrogen atoms bonded to silicon atoms is preferably 0.001 mol/g or more and 0.017 mol/g or less, and 0.002 mol/g or more and 0.015 mol/g. It is more preferably g or less.
  • Examples of the (E) organohydrogenpolysiloxane include trimethylsiloxy group-blocked methylhydrogenpolysiloxane at both ends, trimethylsiloxy group-blocked dimethylsiloxane/methylhydrogensiloxane copolymer at both terminals, and dimethylhydrogensiloxy group-blocked at both ends.
  • the blending amount of the (E) organohydrogenpolysiloxane is preferably 0.1 parts by mass or more and 30 parts by mass or less, and 0.3 parts by mass or more and 20 parts by mass with respect to 100 parts by mass of the (D) organopolysiloxane.
  • the following is more preferable.
  • the molar ratio of Si—H of the organohydrogenpolysiloxane (E) to the alkenyl group of the organopolysiloxane (D) is preferably 0.3 to 5.0, and 0.5 to 2.5. Is more preferable.
  • the (F) filler may be, for example, an inorganic filler.
  • the average particle size of the filler is preferably 1 ⁇ m or more and 30 ⁇ m or less, more preferably 2 ⁇ m or more and 20 ⁇ m or less.
  • the average particle diameter of the (F) filler can be measured as a median diameter by using a particle size distribution measuring device by a laser light diffraction method.
  • the bulk density of the filler is preferably at 0.1 g / cm 3 or more 0.5 g / cm 3 or less, and more preferably less 0.15 g / cm 3 or more 0.45 g / cm 3 ..
  • the bulk density of the filler can be determined based on the method of measuring the apparent specific gravity of JIS K 6223.
  • Examples of (F) fillers include diatomaceous earth, perlite, mica, calcium carbonate, glass flakes, hollow fillers and the like. Among these, as the (F) filler, diatomaceous earth, pearlite, and pulverized products of expanded perlite can be preferably used.
  • the compounding amount of the (F) filler is preferably 5 parts by mass or more and 100 parts by mass or less, and more preferably 10 parts by mass or more and 80 parts by mass or less with respect to 100 parts by mass of the (D) organopolysiloxane. ..
  • the amount of the conductive material (G) blended is preferably 0.5 parts by mass or more and 15 parts by mass or less, and preferably 1 part by mass or more and 10 parts by mass or less, based on 100 parts by mass of the (D) organopolysiloxane. Is more preferable.
  • the (H) addition reaction catalyst may be any catalyst that can activate the addition reaction between the (D) organopolysiloxane and the (E) organohydrogenpolysiloxane.
  • Examples of the (H) addition reaction catalyst include a catalyst having a platinum group element.
  • Examples of the catalyst having a platinum group element include platinum-based catalysts (for example, platinum black, chloroplatinic acid, chloroplatinic acid, a reaction product of chloroplatinic acid and a monohydric alcohol, a complex of chloroplatinic acid and an olefin). , Platinum bisacetoacetate, etc.), palladium-based catalysts, rhodium-based catalysts, and the like.
  • the compounding amount of the (H) addition reaction catalyst may be a catalytic amount.
  • the compounding amount of the (H) addition reaction catalyst is such that the platinum group element content is 0.5 mass ppm or more and 1000 mass ppm or less with respect to the total mass of the (D) organopolysiloxane and the (E) organohydrogenpolysiloxane.
  • the amount is preferably 1 mass ppm or more and 500 mass ppm or less.
  • the addition-curable liquid conductive silicone rubber composition may further contain additives other than (D) to (H).
  • additives include auxiliary agents (chain extenders, crosslinking agents, etc.), foaming agents, dispersants, antioxidants, antioxidants, pigments, colorants, processing aids, softening agents, plasticizers, emulsifiers, A heat resistance improver, a flame retardant improver, an acid acceptor, a thermal conductivity improver, a release agent, a diluent, a reactive diluent, a solvent and the like can be mentioned.
  • additives include dispersants such as low-molecular-weight siloxane ester, polyether-modified silicone oil, silanol, and phenylsilanediol. Also, heat resistance improvers such as iron octylate, iron oxide, and cerium oxide can be mentioned. Further, various carbon functional silanes, various olefin elastomers, etc. for improving the adhesiveness, molding processability and the like may be used. Moreover, you may use the halogen compound etc. which give flame retardancy.
  • the viscosity of the addition-curable liquid conductive silicone rubber composition at 25° C. is preferably 5 Pa ⁇ s or more and 500 Pa ⁇ s or less, and more preferably 5 Pa ⁇ s or more and 200 Pa ⁇ s or less.
  • the thickness of the elastic layer 3 is not particularly limited, and is preferably 0.1 mm or more and 6 mm or less, more preferably 1 mm or more and 4 mm or less.
  • the thickness in this specification indicates the thickness in a direction perpendicular to the axial direction of the developing roller 1.
  • the outer diameter of the elastic layer 3 is not particularly limited and is, for example, preferably 6 mm or more and 25 mm or less, and more preferably 7 mm or more and 21 mm.
  • the outer peripheral surface of the elastic layer 3 is subjected to a surface treatment such as a primer treatment, a corona treatment, a plasma treatment, an excimer treatment, a UV treatment, an itro treatment, and a flame treatment for the purpose of improving adhesion with the coating layer 4.
  • a surface treatment such as a primer treatment, a corona treatment, a plasma treatment, an excimer treatment, a UV treatment, an itro treatment, and a flame treatment for the purpose of improving adhesion with the coating layer 4. You may.
  • the method for forming the elastic layer 3 is not particularly limited.
  • the elastic layer 3 may be formed by a method such as extrusion molding of a silicone rubber composition or LIMS molding.
  • the elastic layer 3 may be formed by grinding or polishing an elastic body (cured product of a silicone rubber composition) formed on the shaft body 2.
  • the elastic layer 3 is formed on the outer peripheral surface of the shaft body 2 by heat curing and molding simultaneously or continuously by a known molding method.
  • the method for curing the rubber composition may be any method that can apply heat necessary for curing the rubber composition, and the method for molding the elastic layer 3 is not particularly limited, such as continuous vulcanization by extrusion molding, press molding, or molding by injection. It is not something that will be done.
  • the rubber composition is an addition-curable millable conductive silicone rubber composition
  • extrusion molding can be selected
  • the rubber composition is an addition-curable liquid conductive silicone rubber composition.
  • a molding method using a mold can be selected.
  • the heating temperature for curing the rubber composition is preferably 100° C. or higher and 500° C. or lower, and more preferably 120° C. or higher and 300° C. or lower in the case of the addition-curable millable conductive silicone rubber composition.
  • the heating time is preferably several seconds or more and 1 hour or less, more preferably 10 seconds or more and 35 minutes or less.
  • the heating temperature is preferably 100°C or higher and 300°C or lower, more preferably 110°C or higher and 200°C or lower.
  • the heating time is preferably several seconds or more and 5 hours or less, more preferably 1 minute or more and 3 hours or less.
  • secondary vulcanization may be carried out if necessary.
  • addition-curable millable conductive silicone rubber composition for example, curing conditions of 100° C. or higher and 200° C. or lower and 1 hour or longer and 20 hours or shorter are selected.
  • addition-curable liquid conductive silicone rubber composition for example, curing conditions of 120° C. or more and 250° C. or less and 2 hours or more and 70 hours or less are selected.
  • a sponge-like elastic layer having bubbles can be easily formed by foaming and curing the rubber composition by a known method.
  • the rubber composition may further contain various additives other than the above.
  • various additives include auxiliary agents (chain extenders, crosslinking agents, etc.), catalysts, dispersants, foaming agents, antioxidants, antioxidants, pigments, colorants, processing aids, softening agents, plasticizers. , Emulsifiers, heat resistance improvers, flame retardancy improvers, acid acceptors, thermal conductivity improvers, release agents, solvents and the like.
  • the coating layer 4 is provided on the outermost surface of the elastic layer 3 and on the outermost surface of the developing roller 1.
  • the coating layer 4 is obtained by applying a composition (hereinafter, referred to as a coating layer resin composition) to the outer peripheral surface of the elastic layer 3 or the primer layer formed as desired, and then applying the coated coating layer resin. It is formed by heat-curing the composition.
  • the coating layer 4 of the present invention is obtained by thermosetting a coating layer resin composition containing (a) polyol, (b) isocyanate, (c) surface roughness material, and (d) conductive material.
  • the (a) polyol contains at least one of (a1) a polyol having an unreactive silicone group in a side chain and (a2) a one-end diol type silicone oil.
  • a1 a polyol having an unreactive silicone group in a side chain
  • a2 a one-end diol type silicone oil.
  • the polyol may be any of various polyols usually used in the preparation of polyurethane, and is preferably at least one polyol selected from polyether polyol, polyester polyol, polyacrylate polyol and polycarbonate polyol. ..
  • the polyether polyol is, for example, polyethylene glycol, polypropylene glycol, polyalkylene glycol such as polypropylene glycol-ethylene glycol, polytetramethylene ether glycol, copolymerized polyol of tetrahydrofuran and alkylene oxide, and various modified products thereof or A mixture etc. are mentioned.
  • Polyester polyol has two or more ester bonds and two or more hydroxyl groups in the molecule.
  • the polyester polyol include a condensation reaction product of a dicarboxylic acid and a polyol.
  • the dicarboxylic acid include aromatic dicarboxylic acids such as phthalic acid, terephthalic acid and isophthalic acid, and aliphatic dicarboxylic acids such as adipic acid and sebacic acid.
  • Polyacrylate polyol is a copolymer of a hydroxyl group-containing monomer and an olefinically unsaturated monomer.
  • (meth)acrylic acid ester, styrene, ⁇ -methylstyrene, vinyltoluene, vinyl ester, maleic acid monoalkyl ester, maleic acid dialkyl ester, fumaric acid monoalkyl ester, or fumaric acid dialkyl ester, and ⁇ -olefin It is a copolymer with unsaturated oligomers and unsaturated polymers.
  • Polycarbonate polyol has two or more carbonate bonds and two or more hydroxyl groups in the molecule.
  • the polycarbonate polyol include a condensation reaction product of a polyol and a carbonate compound.
  • the carbonate compound include dialkyl carbonate, diaryl carbonate, alkylene carbonate and the like.
  • the polyol used as a raw material of the polycarbonate polyol include diols such as hexanediol and butanediol, triols such as 2,4-butanetriol, and the like.
  • the polyol preferably has a number average molecular weight of 500 or more and 8,000 or less, and more preferably 500 or more and 5,000 or less, from the viewpoint of excellent compatibility with isocyanate and the like described later.
  • the ionic liquid is a hydroxyl group-containing ionic liquid, it preferably has a number average molecular weight of 800 or more and 15000 or more, more preferably 1000 or more and 5000 or less.
  • the number average molecular weight is a molecular weight when converted into standard polystyrene by gel permeation chromatography (GPC).
  • the (a) polyol contains at least one of (a1) a polyol having an unreactive silicone group in its side chain, and (a2) one-end diol type silicone oil.
  • (a1) a polyol having an unreactive silicone group in a side chain and (a2) a diol silicone oil having one terminal diol will be described.
  • Polyol having unreactive silicone group in side chain (a1) Polyol having unreactive silicone group in side chain (a1) Examples of the polyol having an unreactive silicone group in side chain include, for example, structural units represented by the following general formulas (1) and (2). And a silicone-grafted acrylic polyol containing
  • R 1 represents H or a methyl group.
  • X is a divalent linking group having 1 to 12 carbon atoms.
  • the linking group an alkylene group or an alkenylene group is preferable.
  • R 2 is an alkyl group having a hydroxy group and having 1 to 12 carbon atoms.
  • the number average molecular weight of the polyol having an unreactive silicone group in the side chain (a1) is preferably 500 or more and 300,000 or less.
  • the number average molecular weight of the silicone group in the polyol having an unreactive silicone group in the side chain (a1) is preferably 500 or more and 100,000 or less.
  • the silicone group in the polyol having an unreactive silicone group in the side chain (a1) is preferably 1% by mass or more and 50% by mass or less in the entire composition.
  • One-end diol type silicone oil includes those represented by the following general formula (3).
  • R 3 and R 6 are alkyl groups having 1 to 12 carbon atoms and 12 or less.
  • R 4 represents a single bond or an alkylene group having 1 to 12 carbon atoms.
  • the viscosity of the one-terminal diol type silicone oil is preferably 130 or more and 550 or less (mm 2 /s), and the hydroxyl value is preferably 8 or more and 35 or less (mgKOH/g).
  • the molecular weight of the one-terminal diol type silicone oil (a2) is preferably 3,000 or more and 15,000 or less. Examples of commercially available products include X-22-176DX, X-22-176F and X-22-176GX-A manufactured by Shin-Etsu Chemical Co., Ltd.
  • the content of (a1) the polyol having an unreactive silicone group in the side chain and (a2) one-terminal diol type silicone oil in at least one kind of (a) polyol is 2% by mass or more and 60% by mass or less. It is preferable that the content is 2% by mass or more and 30% by mass or less.
  • the polyol having an unreactive silicone group in the side chain (a1) and the (a2) one-end diol type silicone oil only the polyol having an unreactive silicone group in the side chain (a1) is included, and the (a1) side chain
  • the polyol having a non-reactive silicone group may be a silicone graft acrylic polyol.
  • the content of the silicone graft acrylic polyol in the polyol is preferably 2% by mass or more and 40% by mass or less.
  • the (a) polyol may contain an acrylic monomer as a constituent unit in addition to at least one of (a1) and (a2).
  • acrylic monomers include acrylic acid, methyl acrylate, ethyl acrylate, octyl acrylate, dodecyl acrylate, 2-ethylhexyl acrylate, propyl acrylate, n-butyl acrylate, isobutyl acrylate, and acrylic.
  • the polyol having an unreactive silicone group in the side chain (a1) is a compound represented by the general formula (1) or (2), an acrylic monomer if necessary, and an azo polymerization initiator. It can be produced by radical copolymerization in the presence of Such polymerization is preferably carried out by a solution polymerization method using a solvent, a bulk polymerization method, an emulsion polymerization method or the like, and a solution polymerization method is particularly preferable.
  • the isocyanate may be any of various isocyanates usually used for preparing polyurethanes, and examples thereof include aliphatic isocyanate, aromatic isocyanate, and derivatives thereof.
  • the isocyanate is preferably an aliphatic isocyanate because of its excellent storage stability and easy control of the reaction rate.
  • aromatic isocyanates include xylylene diisocyanate (XDI), diphenylmethane diisocyanate (MDI), toluene diisocyanate (also referred to as tolylene diisocyanate, TDI), 3,3′-vitrylene-4,4′-diisocyanate, 3,3 '-Dimethyldiphenylmethane-4,4'-diisocyanate, 2,4-tolylene diisocyanate uretidinedione (dimer of 2,4-TDI), xylene diisocyanate, naphthalene diisocyanate (NDI), paraphenylene diisocyanate (PDI), Examples thereof include trisine diisocyanate (TODI) and metaphenylene diisocyanate.
  • TODI trisine diisocyanate
  • TODI metaphenylene diisocyanate
  • aliphatic isocyanate examples include hexamethylene diisocyanate (HDI), 4,4′-dicyclohexylmethane diisocyanate (hydrogenated MDI), orthotoluidine diisocyanate, lysine diisocyanate methyl ester, isophorone diisocyanate (IPDI), norbornane diisocyanate methyl, transcyclohexane.
  • HDI hexamethylene diisocyanate
  • MDI 4,4′-dicyclohexylmethane diisocyanate
  • IPDI isophorone diisocyanate
  • norbornane diisocyanate methyl transcyclohexane.
  • 1,4-diisocyanate and triphenylmethane-4,4′,4′′-triisocyanate examples include 1,4-diisocyanate and triphenylmethane-4,4′,4′′-triisocyanate.
  • a polynuclear polyisocyanate As the derivative, a polynuclear polyisocyanate, a urethane modified product (including urethane prepolymer) modified with a polyol, a dimer by uretdione formation, an isocyanurate modified product, a carbodiimide modified product, a uretonimine modified product, an alohanate modified product, Examples include urea modified products and buret modified products.
  • the polyisocyanate may be used alone or in combination of two or more.
  • the polyisocyanate preferably has a molecular weight of 500 to 2000, more preferably 700 to 1500.
  • the (b) isocyanate used in the resin composition for the coating layer is preferably polyisocyanate.
  • polyisocyanate For example, nurate type isocyanate and adduct type isocyanate can be used. It is particularly preferable to use a blocked isocyanate because the reaction rate can be easily adjusted.
  • the mixing ratio in the mixture of the polyols (a), (a1) and (a2) and the polyisocyanate is not particularly limited, but is usually a hydroxyl group (OH) contained in the polyol and an isocyanate group (NCO) contained in the polyisocyanate. It is preferable that the molar ratio (NCO/OH) thereof is 0.7 or more and 1.15 or less.
  • This molar ratio (NCO/OH) is more preferably 0.85 or more and 1.10 or less from the viewpoint of preventing hydrolysis of polyurethane.
  • an amount equivalent to 3 to 4 times the appropriate molar ratio may be blended in consideration of working environment and working error.
  • the resin composition for the coating layer may be used in combination with an auxiliary agent that is usually used for the reaction of the polyols (a), (a1) and (a2) with the (b) isocyanate, such as a chain extender or a crosslinking agent. May be.
  • auxiliary agent that is usually used for the reaction of the polyols (a), (a1) and (a2) with the (b) isocyanate. May be.
  • chain extenders and crosslinking agents include glycols, hexanetriol, trimethylolpropane, amines and the like.
  • the coating layer 4 contains a surface roughening material.
  • the surface roughness material is particles that adjust the surface roughness of the coating layer 4.
  • the average particle diameter of the surface roughening material blended in the coating layer 4 is preferably 0.1 ⁇ m or more and 20 ⁇ m or less, more preferably 1 ⁇ m or more and 15 ⁇ m or less.
  • the average particle diameter of the surface roughness material can be measured as a median diameter by using a particle size distribution measuring device by a laser light diffraction method.
  • the surface roughness (Rz) of the coating layer 4 is, for example, preferably 1 ⁇ m or more and 20 ⁇ m or less, and more preferably 1 ⁇ m or more and 15 ⁇ m or less.
  • the surface roughness (Rz) of the coating layer 4 refers to the ten-point average roughness measured by the method specified in JIS-1994.
  • the surface roughness of the coating layer 4 can be easily adjusted, for example, by the type and amount of the surface roughness material to be mixed.
  • the kind of the surface roughness material to be blended in the coating layer 4 is not particularly limited and can be appropriately selected and used from known fillers (fillers).
  • fillers for example, it may be small particle size silica, spherical resin particles, metal oxides and the like.
  • the content of the surface roughness material in the coating layer resin composition is preferably 0.1 to 50 parts by mass, and preferably 1 to 40 parts by mass, relative to 100 parts by mass of the coating layer resin composition. Is more preferable.
  • (D) Conductive Material As a conductive material, carbon black, graphite, copper, aluminum, nickel, iron powder, and a conductive agent having an electronic conduction mechanism such as conductive metal oxide, an ion such as an alkali metal salt and a quaternary ammonium salt.
  • a conductive agent having a conductive mechanism and a conductive agent having conductive composite particles in which conductive particles such as carbon black particles are provided on the surface of silica particles are preferable.
  • Carbon black is particularly preferable as the conductive material.
  • the carbon black is not particularly limited, and for example, acetylene black, furnace black, channel black, Ketjen black, thermal black and the like are preferably used. As the carbon black, one of these may be used alone, or two or more thereof may be used in combination. Two or more kinds of various conductive agents may be used in combination in order to obtain a desired electric resistance.
  • the content of the conductive material in the resin composition for the coating layer is preferably 0.5% by mass or more and 20% by mass or less, and 1.0% by mass or more and 15% by mass, based on the total amount of the resin composition for the coating layer. It is more preferable that the content is not more than 2.0%, and further preferably not less than 2.0% by mass and not more than 10% by mass.
  • the coating layer 4 may further contain additives other than the above.
  • the coating layer 4 may further contain additives such as a silane coupling agent, a lubricant, a polymerization catalyst, a dispersant, and a filler.
  • the coating layer 4 is obtained by applying the resin composition for a coating layer onto the elastic layer 3 and heating (a) the polyol, (a1) a polyol having an unreactive silicone group in the side chain, and (a2) one end. It is formed by polymerizing and curing at least one diol type silicone oil and the isocyanate component (b).
  • the solvent used in the coating liquid is preferably a solvent capable of dissolving the polyol and the isocyanate component, and may be, for example, ethyl acetate, butyl acetate or the like.
  • the coating of the resin composition for the coating layer may be performed, for example, by applying a coating liquid of the resin composition for the coating layer, dipping method of immersing the elastic layer 3 or the like in the coating liquid, or applying the coating liquid to the elastic layer. It is carried out by a known coating method such as a spray coating method of spraying onto 3 or the like.
  • the resin composition for the coating layer may be applied as it is, or may be applied to the resin composition for the coating layer, for example, alcohols such as methanol and ethanol, aromatic solvents such as xylene and toluene, ethyl acetate and butyl acetate. You may apply the coating liquid which added volatile solvents, such as ester type solvent of this, or water.
  • the method of curing the coating layer resin composition thus coated may be a method of adding heat or water necessary for curing the coating layer resin composition, for example, a coating layer resin.
  • a method of heating the elastic layer 3 coated with the composition with a heater a method of leaving the elastic layer 3 coated with the resin composition for a coating layer under high humidity, and the like.
  • the heating temperature for heat-curing the resin composition for coating layer is, for example, preferably 100° C. or higher and 200° C. or lower, particularly preferably 120° C. or higher and 160° C. or lower, and the heating time is 10 minutes or longer. It is preferably 120 minutes or less, and more preferably 30 minutes or more and 60 minutes or less.
  • the coating layer resin composition is laminated on or on the outer peripheral surface of the elastic layer 3 or the primer layer by a known molding method such as extrusion molding, press molding, or injection molding. After that, a method of curing the laminated resin composition for the coating layer or the like can be adopted.
  • the developing roller 1 of the present invention may include an intermediate layer such as an adhesive layer or a primer layer between the shaft body 2 and the elastic layer 3 and between the elastic layer 3 and the coating layer 4.
  • an intermediate layer such as an adhesive layer or a primer layer between the shaft body 2 and the elastic layer 3 and between the elastic layer 3 and the coating layer 4.
  • the electrical characteristics of the developing roller 1 are adjusted by adjusting the electrical characteristics thereof. Can be adjusted, whereby the developing performance of the developing roller 1 can be adjusted well.
  • primer layer those usually used as a primer layer of a developing roller can be used.
  • a primer layer made of a urethane resin having an ester group the developing performance of the developing roller 1 can be improved. Can be maintained.
  • the developing roller 1 according to this embodiment can be suitably used as a developer carrier in a developing device and an image forming apparatus.
  • the configuration of the image forming apparatus other than the developing roller 1 is not particularly limited. An example of a developing device and an image forming apparatus including the developing roller 1 of the present invention will be described with reference to FIG.
  • the image forming apparatus 10 is a tandem type color image forming apparatus in which a plurality of image carriers 11B, 11C, 11M and 11Y provided in developing units B, C, M and Y of respective colors are arranged in series on a transfer/conveying belt 6.
  • the developing units B, C, M and Y are arranged in series on the transfer/conveying belt 6.
  • the developing unit B includes an image carrier 11B such as a photoconductor (also referred to as a photosensitive drum), a charging unit 12B such as a charging roller, an exposure unit 13B, a developing device 20B, and an image carrier via the transfer/conveying belt 6.
  • a transfer unit 14B which is in contact with the body 11B, for example, a transfer roller, and a cleaning unit 15B are provided.
  • the developing device 20B is an example of the developing device of the present invention, and includes the developing roller 1 of the present invention and a developer 22B as shown in FIG. Therefore, in this image forming apparatus 10, the developing roller 1 is mounted as the developer carrying members 23B, 23C, 23M and 23Y.
  • the developing device 20B includes a housing 21B containing a one-component non-magnetic developer 22B, a developer carrier 23B that supplies the developer 22B to the image carrier 11B, such as the developing roller 1, and a developer.
  • a toner supply roller 25B for supplying the developer 22B to the carrier 23B and a developer amount adjusting means 24B for adjusting the thickness of the developer 22B, for example, a blade are provided.
  • the developer amount adjusting means 24B is in contact with or in pressure contact with the outer peripheral surface of the developer carrier 23B, as shown in FIG. That is, the developing device 20B is a "contact type developing device".
  • the developing units C, M, and Y are basically configured similarly to the developing unit B, and the same elements are denoted by the same reference numerals and the symbols C, M, or Y indicating the respective units, and description thereof will be omitted. ..
  • the developer carrier 23B of the developing device 20B is arranged such that the surface thereof contacts or presses the surface of the image carrier 11B.
  • the developing devices 20C, 20M and 20Y are arranged such that the surfaces of the developing agent carriers 23C, 23M and 23Y are in contact with or in pressure contact with the surfaces of the image carriers 11C, 11M and 11Y. .. That is, the image forming apparatus 10 is a “contact type image forming apparatus”.
  • the fixing unit 30 is arranged on the downstream side of the developing unit Y.
  • the fixing unit 30 includes a fixing roller 31, an endless belt supporting roller 33 disposed near the fixing roller 31, a fixing roller 31, and an endless belt in a housing 34 having an opening 35 through which the recording medium 16 passes.
  • An endless belt 36 wound around the support roller 33 and a pressure roller 32 arranged to face the fixing roller 31 are provided, and the fixing roller 31 and the pressure roller 32 are in contact with each other or pressed against each other via the endless belt 36.
  • the pressure heat fixing device is rotatably supported as described above.
  • a cassette 41 that houses the recording body 16 is installed.
  • the transfer/conveyance belt 6 is wound around a plurality of support rollers 42.
  • Each of the developers 22B, 22C, 22M and 22Y used in the image forming apparatus 10 may be a dry developer or a wet developer as long as it is a developer that can be charged by friction, and a non-magnetic developer or a magnetic developer. It may be an agent.
  • a dry developer or a wet developer as long as it is a developer that can be charged by friction
  • a non-magnetic developer or a magnetic developer may be an agent.
  • one-component non-magnetic black developer 22B, cyan developer 22C, magenta developer 22M and yellow developer 22Y are stored. It is stored.
  • the image forming apparatus 10 forms a color image on the recording body 16 as follows. First, in the developing unit B, an electrostatic latent image is formed on the surface of the image carrier 11B charged by the charging unit 12B by the exposure unit 13B, and a black electrostatic latent image is formed by the developer 22B supplied by the developer carrier 23B. The image is developed. Then, when the recording body 16 passes between the transfer means 14B and the image carrier 11B, a black electrostatic latent image is transferred onto the surface of the recording body 16. Then, similarly to the developing unit B, the cyan image, the magenta image, and the yellow image are superimposed on the recording body 16 whose electrostatic latent image has been visualized as a black image by the developing units C, M, and Y, respectively. The color image is visualized. Then, the recording body 16 on which the color image is visualized is fixed on the recording body 16 by the fixing means 30 as a permanent image. In this way, a color image can be formed on the recording body 16.
  • the developing device 20B is provided with the developing roller 1 and is excellent in developer transportability and can suppress the occurrence of toner filming, thereby contributing to forming a high-density, high-quality image for a long time.
  • the image forming apparatus 10 can form a high density and high quality image for a long period of time.
  • the developing device and the image forming apparatus of the present invention are not limited to those described above, and various modifications are possible within a range in which the object of the present invention can be achieved.
  • the image forming apparatus is an electrophotographic image forming apparatus, but in the present invention, the image forming apparatus is not limited to the electrophotographic method and may be, for example, an electrostatic image forming apparatus. .. Further, the image forming apparatus provided with the developing roller of the present invention is not limited to a tandem type color image forming apparatus in which a plurality of image carriers having developing units of respective colors are arranged in series on a transfer/conveying belt. A monochrome image forming apparatus having a single developing unit, a four-cycle type color image forming apparatus in which primary transfer of a developer image carried on an image carrier to an endless belt is sequentially repeated may be used.
  • the developer used in the image forming apparatus is a one-component non-magnetic developer, but in the present invention, it may be a one-component magnetic developer or a two-component non-magnetic developer. Also, it may be a two-component magnetic developer.
  • the image forming apparatus is a contact type image forming apparatus which is arranged in contact with or in pressure contact with an image carrier, a developer supply roller, a blade, and the like.
  • the image forming apparatus of the present invention may be a non-contact type image forming apparatus in which the surface of the developer carrying member is arranged with a gap so as not to contact the surface of the image carrying member.
  • Example 1 (Formation of primer layer) A shaft body (SUM22, diameter 10 mm, length 275 mm) that has been subjected to electroless nickel plating is washed with ethanol, and a silicone-based primer (trade name “Primer No. 16”, manufactured by Shin-Etsu Chemical Co., Ltd.) on the surface of the shaft body. ) was applied. The shaft body subjected to the primer treatment was baked at a temperature of 150° C. for 10 minutes using a gear oven, and then cooled at room temperature for 30 minutes or longer to form a primer layer on the outer peripheral surface of the shaft body.
  • a silicone-based primer trade name “Primer No. 16”, manufactured by Shin-Etsu Chemical Co., Ltd.
  • a silicone rubber composition for forming an elastic layer was prepared as follows. That is, 100 parts by mass of dimethylpolysiloxane having both ends blocked with dimethylvinylsiloxy groups (polymerization degree: 300), and hydrophobized fumed silica having a BET specific surface area of 110 m 2 /g (trade name: “R-972” ”, manufactured by Nippon Aerosil Co., Ltd.), 40 parts by mass of diatomaceous earth (trade name “Oplite W-3005S”, manufactured by Chuo Silica Co., Ltd.) having an average particle diameter of 6 ⁇ m and a bulk density of 0.25 g/cm 3.
  • An elastic body made of a rubber material was molded on the outer peripheral surface of the shaft body by injection molding the prepared addition-curable liquid conductive silicone rubber composition using a mold.
  • the addition curable liquid conductive silicone rubber composition was heated at 120° C. for 10 minutes to be cured, and secondary vulcanization was performed at 200° C. for 4 hours to form an elastic layer having an outer diameter of 16 mm.
  • the silicone graft acrylic polyol (a1) was produced by radically polymerizing the compounds represented by the general formulas (1) and (2) in the presence of azobisisobutyronitrile (AIBN).
  • the resin composition for a coating layer was applied to the outer peripheral surface of the elastic layer by a spray coating method and heated at 160° C. for 30 minutes to form a coating layer having a layer thickness of 20 ⁇ m. In this way, a developing roller provided with the shaft body, the elastic layer and the coating layer was manufactured.
  • Examples 2 to 7, Comparative Examples 1 to 3 A developing roller was manufactured in the same manner as in Example 1 with the materials and formulations shown in Table 1.
  • the (a) polyester-based polyol is POLYCASTOR #10 manufactured by Ito Oil Co., Ltd.
  • the (a2) one-end diol type silicone oil is X-22-176DX manufactured by Shin-Etsu Chemical Co., Ltd.
  • As the adduct type isocyanate Asahi Kasei Corporation Duranate E402-B80B was used.
  • An image forming apparatus HL-3170CDW (model number, manufactured by Brother Industry Co., Ltd.) was prepared, and the developing roller of this image forming apparatus was replaced with the developing roller of each of the examples and comparative examples to obtain an image forming apparatus.
  • the dynamic friction coefficient, the static friction coefficient, and the banding were evaluated by the following methods.
  • the produced developing roller was measured a plurality of times in the roller longitudinal direction at a load of 300 N according to the measuring method using i-tester TL701 (R contactor) manufactured by Trinity Lab Co., Ltd., and the arithmetic average value thereof was used for each test sheet. was calculated as the static friction coefficient and the dynamic friction coefficient.
  • Table 1 shows the evaluation results.

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Abstract

La présente invention concerne un rouleau de développement 1 qui est pourvu : d'une couche élastique 3 formée sur la surface circonférentielle externe d'un corps d'arbre 2 ; et d'une couche de revêtement 4 formée sur la surface circonférentielle externe de la couche élastique 3, la couche de revêtement 4 étant formée par le durcissement thermique d'une composition de résine qui est destinée à être utilisée avec la couche de revêtement et qui contient un polyol (a), un isocyanate (b), un matériau de rugosité de surface (c) et un matériau conducteur (d), et le polyol (a) contient un polyol (a1) ayant un groupe silicone non réactif dans une chaîne latérale et/ou une huile de silicone de type diol monoterminal (a2).
PCT/JP2019/044136 2018-11-27 2019-11-11 Rouleau de développement, dispositif de développement et dispositif de formation d'image WO2020110686A1 (fr)

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JPH11267583A (ja) * 1998-11-09 1999-10-05 Tokai Rubber Ind Ltd 低硬度導電性ロールの製法およびそれにより得られた低硬度導電性ロール
JP2001188412A (ja) * 1999-10-19 2001-07-10 Bridgestone Corp ウレタンローラおよびそれを用いた電子写真装置
JP2003020318A (ja) * 2001-05-02 2003-01-24 Bridgestone Corp 弾性部材及び画像形成装置
KR20070058154A (ko) * 2005-05-11 2007-06-08 전영식 도전막 연속기포 스폰지 롤 및 그 제조방법
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