Abstract: The charging roll 10 for an electrophotographic device comprises a shaft 12, an elastic layer 14 formed on the outer peripheral surface of the shaft 12, and a top layer 16 formed on the outer peripheral surface of the elastic layer 14. The elastic layer 14 is constituted of a high-resistance first phase 14a in which the surface resistance value is 1.6×1014 ?·cm to 8.8×1015 ?·cm (inclusive), and a low-resistance second phase 14b in which the surface resistance value is 1.3×102 ?·cm to 4.9×103 ?·cm (inclusive). The second phase 14b contains two types of carbon black: carbon black A, of which the amount of DBP absorption is 115 cm3/100 g to 160 cm3/100 g (inclusive); and carbon black B, of which the amount of DBP absorption is 70 cm3/100 g to 110 cm3/100 g (inclusive).

Abstract: A charging roll includes a shaft body, an elastic body layer formed on an outer circumferential surface of the shaft body, and a surface layer formed on an outer circumferential surface of the elastic body layer. The elastic body layer includes silicone rubber. A plurality of large protruding parts having a width of 13-48 ?m and a height of 5-13 ?m are provided on the outer circumferential surface of the elastic body layer, and a plurality of small protruding parts forming unevenness having a ten-point average roughness Rz of 1.0-6.0?m are provided on the surface of the large protruding parts. The surface layer contains a urethane polymer, and the elongation at breakage of the surface layer is 285-525%.

Abstract: An elastic body layer is composed of a conductive rubber composition containing an isoprene rubber, a rubber other than the isoprene rubber, and carbon black. The elastic body layer is phase-separated into a first rubber phase containing the isoprene rubber and a second rubber phase containing the rubber other than the isoprene rubber; in the range of a 5 ?m×5 ?m square of an arbitrary cross section of the elastic body layer, the area ratio of the first rubber phase is within a range of 10 to 90%. The resistance value of the elastic body layer is within a range of 1.0×103 to 1.0×106?. A surface layer contains an electronic conductive agent and a crosslinked body of at least one polyurethane resin of an ether polyurethane resin and a carbonate polyurethane resin, and the glass transition point of the surface layer is within a range of ?10 to ?70° C.

Abstract: An elastic body layer is composed of a conductive rubber composition containing an isoprene rubber, a rubber other than the isoprene rubber, and carbon black. The elastic body layer is phase-separated into a first rubber phase containing the isoprene rubber and a second rubber phase containing the rubber other than the isoprene rubber; in the range of a 5 ?m×5 ?m square of an arbitrary cross section of the elastic body layer, the area ratio of the first rubber phase is within a range of 10 to 90%. The resistance value of the elastic body layer is within a range of 1.0×103 to 1.0×106?. A surface layer contains an electronic conductive agent and a crosslinked body of at least one polyurethane resin of an ether polyurethane resin and a carbonate polyurethane resin, and the glass transition point of the surface layer is within a range of ?10 to ?70° C.

Abstract: A method for manufacturing a blade for electrophotographic devices and a blade for electrophotographic devices are provided. The method includes: an impregnation step of impregnating, from the surface of at least a part of a blade-shaped substrate containing urethane rubber, with a blocked isocyanate in which an isocyanate group is blocked with a blocking agent, wherein the part includes a portion that comes into contact with a mating member; and a curing step of dissociating the blocking agent from the blocked isocyanate impregnated into the substrate in the impregnation step, and then curing the released isocyanate in the substrate to form a cured portion in at least the part of the substrate including the portion that comes into contact with the mating member. In the method, the isocyanate released from the blocked isocyanate includes an aromatic isocyanate.

Abstract: A method for manufacturing a blade for electrophotographic devices and a blade for electrophotographic devices are provided. The method includes: an impregnation step of impregnating, from the surface of at least a part of a blade-shaped substrate containing urethane rubber, with a blocked isocyanate in which an isocyanate group is blocked with a blocking agent, wherein the part includes a portion that comes into contact with a mating member; and a curing step of dissociating the blocking agent from the blocked isocyanate impregnated into the substrate in the impregnation step, and then curing the released isocyanate in the substrate to form a cured portion in at least the part of the substrate including the portion that comes into contact with the mating member. In the method, the isocyanate released from the blocked isocyanate includes an aromatic isocyanate.

Abstract: The disclosure provides a cleaning blade having a blade portion. The blade portion has a blade tip equipped with an edge constituted by a ridge line between the tip surface the blade portion and a blade surface arranged near a photosensitive drum. The blade portion satisfies the following expressions: a?50 ?m, and 0.1?b/a?0.6 where, when the blade portion is viewed along blade longitudinal direction with the edge in sliding contact with the photosensitive drum for measurement rotating in one direction, a represents a maximum amplitude of the edge which vibrates with the rotation of the photosensitive drum for measurement, and b represents a maximum amplitude when a position separated from the edge by 200 ?m on the blade surface of the blade tip vibrates with the oscillation of the edge.

Abstract: Provided is a cleaning blade. The cleaning blade is used for removing remaining toner which remains on a surface of the target member in an electrophotographic apparatus. The cleaning blade is provided with the blade portion having the edge portion which comes into sliding contact with the target member. The edge portion includes: a substrate of the blade portion; an inner layer extending from a surface of the substrate to the inside of the substrate; and an outer layer extending from a surface of the substrate to an outer outside of the substrate. The inner layer contains at least an acrylic resin or a methacrylate resin, and has a thickness of less than 1 ?m. The outer layer contains at least an acrylic resin or a methacrylate resin, and has a thickness of 0.02 ?m or less.

Abstract: The disclosure provides a cleaning blade having a blade portion. The blade portion has a blade tip equipped with an edge constituted by a ridge line between the tip surface the blade portion and a blade surface arranged near a photosensitive drum. The blade portion satisfies the following expressions: a?50 ?m, and 0.1?b/a?0.6 where, when the blade portion is viewed along blade longitudinal direction with the edge in sliding contact with the photosensitive drum for measurement rotating in one direction, a represents a maximum amplitude of the edge which vibrates with the rotation of the photosensitive drum for measurement, and b represents a maximum amplitude when a position separated from the edge by 200 ?m on the blade surface of the blade tip vibrates with the oscillation of the edge.

Abstract: The disclosure shows a cleaning blade for electrophotographic equipment, the cleaning blade through which both high hardness and low warping are obtained and excellent toner scraping properties are realized. The cleaning blade (10) includes a blade part (12) comprising a cured material of a urethane composition containing a polyol, an isocyanate, and a crosslinker or a chain extender. The content of the isocyanate is 28.0 mass % or more with respect to the entire composition. The crosslinker or the chain extender comprises a triol having a molecular weight of 150 or less. The content of the crosslinker or the chain extender is 4.0 mass % or less with respect to the entire composition. The content of the triol having a molecular weight of 150 or less is 0.8 mass % or more with respect to the entire composition.

Abstract: The disclosure shows a cleaning blade for electrophotographic equipment, the cleaning blade through which both high hardness and low warping are obtained and excellent toner scraping properties are realized. The cleaning blade (10) includes a blade part (12) comprising a cured material of a urethane composition containing a polyol, an isocyanate, and a crosslinker or a chain extender. The content of the isocyanate is 28.0 mass % or more with respect to the entire composition. The crosslinker or the chain extender comprises a triol having a molecular weight of 150 or less. The content of the crosslinker or the chain extender is 4.0 mass % or less with respect to the entire composition. The content of the triol having a molecular weight of 150 or less is 0.8 mass % or more with respect to the entire composition.

Abstract: To provide a composition for a cleaning blade for an electrophotographic apparatus, and a cleaning blade for an electrophotographic apparatus that are capable of suppressing wear, chipping, curling, and contamination. A urethane composition contains (a) a polyester polyol, (b) a polyisocyanate, and (c) a modified silicone oil, wherein the (c) modified silicone oil contains a polysiloxane block and an alkylene oxide block, the alkylene oxide block having a hydroxyl group protected by a protecting group, and the (c) modified silicone oil has no hydroxyl group. A cleaning blade is made of a molding of the urethane composition and contains a polyurethane elastomer and the (c) modified silicone oil.

Abstract: Provided is a cleaning blade. The cleaning blade is used for removing remaining toner which remains on a surface of the target member in an electrophotographic apparatus. The cleaning blade is provided with the blade portion having the edge portion which comes into sliding contact with the target member. The edge portion includes: a substrate of the blade portion; an inner layer extending from a surface of the substrate to the inside of the substrate; and an outer layer extending from a surface of the substrate to an outer outside of the substrate. The inner layer contains at least an acrylic resin or a methacrylate resin, and has a thickness of less than 1 ?m. The outer layer contains at least an acrylic resin or a methacrylate resin, and has a thickness of 0.02 ?m or less.

Abstract: A method for producing a blade member 1 includes an impregnation step of impregnating at least a portion of a surface of a blade portion 11 made of a polyurethane rubber with a surface treatment liquid that includes a salt of diazabicycloundecene and a carbodiimide-modified polyvalent isocyanate compound including a carbodiimide-modified polyvalent isocyanate dimer and a carbodiimide-modified polyvalent isocyanate trimer or higher multimer, in which a content of the trimer or higher multimer is 50% by mass or less, and a cured layer formation step of heating and curing the carbodiimide-modified polyvalent isocyanate compound which is impregnated into the blade portion 11, to form a cured layer 110.

Abstract: To provide a composition for a cleaning blade for an electrophotographic apparatus, and a cleaning blade for an electrophotographic apparatus that are capable of suppressing wear, chipping, curling, and contamination. A urethane composition contains (a) a polyester polyol, (b) a polyisocyanate, and (c) a modified silicone oil, wherein the (c) modified silicone oil contains a polysiloxane block and an alkylene oxide block, the alkylene oxide block having a hydroxyl group protected by a protecting group, and the (c) modified silicone oil has no hydroxyl group. A cleaning blade is made of a molding of the urethane composition and contains a polyurethane elastomer and the (c) modified silicone oil.

Abstract: A method for producing a blade member 1 includes an impregnation step of impregnating at least a portion of a surface of a blade portion 11 made of a polyurethane rubber with a surface treatment liquid that includes a salt of diazabicycloundecene and a carbodiimide-modified polyvalent isocyanate compound including a carbodiimide-modified polyvalent isocyanate dimer and a carbodiimide-modified polyvalent isocyanate trimer or higher multimer, in which a content of the trimer or higher multimer is 50% by mass or less, and a cured layer formation step of heating and curing the carbodiimide-modified polyvalent isocyanate compound which is impregnated into the blade portion 11, to form a cured layer 110.