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1
US10197928B2
Publication/Patent Number: US10197928B2
Publication date: 2019-02-05
Application number: 15/591,692
Filing date: 2017-05-10
Abstract: The present invention relates to an electrophotographic photoreceptor which is a positive charging type electrophotographic photoreceptor comprising a conductive support and a photosensitive layer on the conductive support, wherein the photosensitive layer contains at least a charge generating material, a hole transport material, an electron transport material, and a binder resin in the same layer, and a residual potential VL1 at a point at which an exposure amount for forming a latent image is 0.3 μJ/cm2 is equal to or lower than 130 V when an initial surface potential V0 is set to +700 V, exposure with monochromatic light of 780 nm is performed and measurement is performed by a dynamic method. The present invention relates to an electrophotographic photoreceptor which is a positive charging type electrophotographic photoreceptor comprising a conductive support and a photosensitive layer on the conductive support, wherein the photosensitive layer contains at least a ...more ...less
2
US10175590B2
Publication/Patent Number: US10175590B2
Publication date: 2019-01-08
Application number: 15/128,801
Filing date: 2015-12-07
Abstract: This electrophotographic photosensitive body (20) comprises a supporting body (20a) and a photosensitive layer (20b) that is formed on the surface of the supporting body (20a). The surface of the photosensitive layer (20b) has an arithmetic mean roughness Ra within the range of from 20 nm to 100 nm (inclusive), a ten-point average roughness Rz within the range of from 0.2 μm to 1.0 μm (inclusive) and a mean spacing of profile irregularities Sm of 20 μm or less in the initial stage of use. This electrophotographic photosensitive body (20) comprises a supporting body (20a) and a photosensitive layer (20b) that is formed on the surface of the supporting body (20a). The surface of the photosensitive layer (20b) has an arithmetic mean roughness Ra within the range of ...more ...less
3
US10379451B2
Publication/Patent Number: US10379451B2
Publication date: 2019-08-13
Application number: 15/904,527
Filing date: 2018-02-26
Abstract: A polyarylate resin includes at least one type of repeating unit represented by a general formula (1), at least one type of repeating unit represented by a general formula (2), and a terminal group represented by a general formula (3). R1, R2, R3, and R4 each represent, independently of one another, a hydrogen atom or a methyl group. R5 and R6 each represent, independently of each other, a hydrogen atom or a C1-4 alkyl group. R5 and R6 may bond together to represent a C5-7 cycloalkylidene group. X1 represents a divalent group represented by a chemical formula (2A), (2B), (2C), or (2D) with the proviso that when only one type of repeating unit represented by the general formula (2) is included, X1 does not represent a divalent group represented by the chemical formula (2D). Rf represents a chain aliphatic group having at least one fluoro group. A polyarylate resin includes at least one type of repeating unit represented by a general formula (1), at least one type of repeating unit represented by a general formula (2), and a terminal group represented by a general formula (3). R1, R2, R3, and R4 each represent ...more ...less
4
US2019056676A1
Publication/Patent Number: US2019056676A1
Publication date: 2019-02-21
Application number: 16/101,575
Filing date: 2018-08-13
Abstract: Provided is an electrophotographic photosensitive member, wherein a surface layer of the electrophotographic photosensitive member contains a copolymer of a hole-transportable compound having a polymerizable functional group and a compound represented by the following general formula (1). Ar1L1-P1)m  (1) Provided is an electrophotographic photosensitive member, wherein a surface layer of the electrophotographic photosensitive member contains a copolymer of a hole-transportable compound having a polymerizable functional group and a compound represented by the following general ...more ...less
5
US10209639B2
Publication/Patent Number: US10209639B2
Publication date: 2019-02-19
Application number: 15/484,715
Filing date: 2017-04-11
Abstract: A photoconductor including a conductive support, an undercoat layer, a charge-generating layer, and a charge-transporting layer, at least the undercoat layer, the charge-generating layer, and the charge-transporting layer being disposed on the conductive support in an order mentioned, wherein the undercoat layer includes a binder resin and metal oxide particles, and the charge-generating layer includes a binder resin, a titanyl phthalocyanine pigment, and a salicylic acid derivative. A photoconductor including a conductive support, an undercoat layer, a charge-generating layer, and a charge-transporting layer, at least the undercoat layer, the charge-generating layer, and the charge-transporting layer being disposed on the conductive support in an order ...more ...less
6
US2019086825A1
Publication/Patent Number: US2019086825A1
Publication date: 2019-03-21
Application number: 16/092,013
Filing date: 2017-03-17
Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer containing at least a charge generating material, an electron transport material, a hole transport material, and a binder resin. The electron transport material includes a naphthoquinone derivative represented by general formula (1). An amount of triboelectric charge of calcium carbonate as measured by charging the calcium carbonate through friction with the photosensitive layer (3) is at least +7 μC/g. In general formula (1), R11 and R12 are respectively the same as R11 and R12 described in the description. An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer containing at least a charge generating material, an electron transport material, a hole ...more ...less
7
US2019219937A1
Publication/Patent Number: US2019219937A1
Publication date: 2019-07-18
Application number: 16/368,121
Filing date: 2019-03-28
Abstract: The present invention aims to provide an electrophotographic photoreceptor including a charge transport layer and being excellent in electrical properties and adhesiveness while exhibiting sufficient abrasion resistance indispensable for prolonging the life, and an electrophotographic photoreceptor cartridge and an image forming apparatus including the electrophotographic photoreceptor, which is an electrophotographic photoreceptor including a charge transport layer including at least two layers, wherein an elastic deformation ratio of a binder resin contained in a first charge transport layer which is an outermost layer and an elastic deformation ratio of a binder resin contained in a second charge transport layer satisfy a predetermined relationship. The present invention aims to provide an electrophotographic photoreceptor including a charge transport layer and being excellent in electrical properties and adhesiveness while exhibiting sufficient abrasion resistance indispensable for prolonging the life, and an ...more ...less
8
US10416594B2
Publication/Patent Number: US10416594B2
Publication date: 2019-09-17
Application number: 15/703,805
Filing date: 2017-09-13
Abstract: An image forming method includes forming an image with a toner using a photoconductor in which an intermediate layer and a photosensitive layer including a charge generating layer and a charge transport layer are formed overlying an electroconductive substrate, wherein the ionization potential of the surface of the photoconductor and the ionization potential of the surface of the toner satisfy the following relations 1 and 2, |Ip (the surface of the photoconductor)−Ip (the surface of the toner)|≤0.18 (eV)   Relation 1 5.45 (eV)≤Ip (the surface of the photoconductor)≤5.53 (eV)   Relation 2 where Ip (the surface of the photoconductor) represents the ionization potential of the surface of the photoconductor and Ip (the surface of the toner) represents the ionization potential of the surface of the toner. An image forming method includes forming an image with a toner using a photoconductor in which an intermediate layer and a photosensitive layer including a charge generating layer and a charge transport layer are formed overlying an electroconductive substrate, ...more ...less
9
US10241428B2
Publication/Patent Number: US10241428B2
Publication date: 2019-03-26
Application number: 15/667,690
Filing date: 2017-08-03
Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The photosensitive layer has a scratch resistance depth of no greater than 0.50 μm. An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a ...more ...less
10
US2019011845A1
Publication/Patent Number: US2019011845A1
Publication date: 2019-01-10
Application number: 16/025,351
Filing date: 2018-07-02
Abstract: Provided is an electrophotographic photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, wherein the undercoat layer and the photoconductive layer are provided over the conductive support in the order of reciting, wherein the undercoat layer contains at least metal oxide particles, a binder, and a salicylic acid derivative such as 4-methylsalicylic acid, wherein the metal oxide particles have a volume resistivity of 1×105 Ω·cm or higher but 1×108 Ω·cm or lower, wherein the undercoat layer has a volume resistivity of 0.001×106 Ω·cm or higher but 0.02×106 Ω·cm or lower, and wherein the undercoat layer has a thickness of 2 micrometers or greater but 20 micrometers or less. Provided is an electrophotographic photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, wherein the undercoat layer and the photoconductive layer are provided over the conductive support in the order of reciting, wherein the undercoat ...more ...less
11
US2019235399A1
Publication/Patent Number: US2019235399A1
Publication date: 2019-08-01
Application number: 16/258,790
Filing date: 2019-01-28
Abstract: An electrophotographic photosensitive member includes a conductive substrate and a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, an additive, and a binder resin. An optical response time is in a range from 0.05 milliseconds to 0.85 milliseconds. The optical response time is a time from irradiation of a surface of the photosensitive layer charged to +800 V with pulse light having a wavelength of 780 nm to surface potential decay of the photosensitive layer from +800 V to +400 V. An optical intensity of the pulse light is set so that the surface potential of the photosensitive layer becomes +200 V from +800 V after 400 milliseconds from pulse light irradiation of the surface of the photosensitive layer charged to the +800 V. The additive includes either of both an ultraviolet absorbing agent and an antioxidant. An electrophotographic photosensitive member includes a conductive substrate and a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, an additive, and a binder resin. An ...more ...less
12
US2019235400A1
Publication/Patent Number: US2019235400A1
Publication date: 2019-08-01
Application number: 16/260,255
Filing date: 2019-01-29
Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer of a single layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. An optical response time is at least 0.05 milliseconds and no greater than 0.85 milliseconds. The binder resin includes a polycarbonate resin including a repeating unit represented by general formula (1) shown below and a repeating unit represented by general formula (2) shown below. An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer of a single layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. An optical ...more ...less
14
US10416579B2
Publication/Patent Number: US10416579B2
Publication date: 2019-09-17
Application number: 16/045,144
Filing date: 2018-07-25
Abstract: An electrophotographic photoreceptor which, even when mounted on a high-image-quality monochrome high-speed printer or tandem color printer including a cleaner-less process of a non-magnetic single-component contact development system using a polymerized toner, inhibits the generation of fine black spots or color spots and suppresses the occurrence of toner filming during the initial printing under a high-temperature and high-humidity environment and thereby stably attains a high image quality in a variety of environments. The electrophotographic photoreceptor is a positively-chargeable electrophotographic having a contact angle between the surface of an outermost layer and water that is in a range of 81° to 87° and having a binder resin of an outermost layer containing resins having repeating units represented by Formula (1) and Formula (2) below: An electrophotographic photoreceptor which, even when mounted on a high-image-quality monochrome high-speed printer or tandem color printer including a cleaner-less process of a non-magnetic single-component contact development system using a polymerized toner, inhibits the ...more ...less
15
US10168628B2
Publication/Patent Number: US10168628B2
Publication date: 2019-01-01
Application number: 16/005,099
Filing date: 2018-06-11
Abstract: A metallic ingot for impact pressing includes a contact surface of the metallic ingot to contact a male mold in impact pressing having a maximum height roughness Rz of 20 μm to 50 μm and an average length of a roughness curve element RSm of 150 μm to 400 μm, the male mold being to be used in combination with a female mold in the impact pressing. A metallic ingot for impact pressing includes a contact surface of the metallic ingot to contact a male mold in impact pressing having a maximum height roughness Rz of 20 μm to 50 μm and an average length of a roughness curve element RSm of 150 μm to 400 ...more ...less
16
US2019107790A1
Publication/Patent Number: US2019107790A1
Publication date: 2019-04-11
Application number: 16/210,378
Filing date: 2018-12-05
Abstract: The present invention relates to an electrophotographic photoreceptor which is a positive charging type electrophotographic photoreceptor comprising a conductive support and a photosensitive layer on the conductive support, wherein the photosensitive layer contains at least a charge generating material, a hole transport material, an electron transport material, and a binder resin in the same layer, and a residual potential VL1 at a point at which an exposure amount for forming a latent image is 0.3 μJ/cm2 is equal to or lower than 130 V when an initial surface potential V0 is set to +700 V, exposure with monochromatic light of 780 nm is performed and measurement is performed by a dynamic method. The present invention relates to an electrophotographic photoreceptor which is a positive charging type electrophotographic photoreceptor comprising a conductive support and a photosensitive layer on the conductive support, wherein the photosensitive layer contains at least a ...more ...less
17
US2019163093A1
Publication/Patent Number: US2019163093A1
Publication date: 2019-05-30
Application number: 16/162,991
Filing date: 2018-10-17
Abstract: A tandem type electrophotographic image forming device using an organic photoreceptor, includes a plurality of image forming units each including at least: an electrostatic latent image former; a developer; a lubricant supplier; and a cleaner, wherein at least one combination composed of the two adjacent image forming units including toners having different colors satisfies the following formula (1) if a universal hardness of an organic photoreceptor A included in the image forming unit disposed on an upstream side is represented by Ha, and a universal hardness of an organic photoreceptor B included in the image forming unit disposed on a downstream side is represented by Hb. [Numerical formula 1] Hb−Ha≥10 N/mm2  (1) A tandem type electrophotographic image forming device using an organic photoreceptor, includes a plurality of image forming units each including at least: an electrostatic latent image former; a developer; a lubricant supplier; and a cleaner, wherein at least one combination ...more ...less
18
US10429753B2
Publication/Patent Number: US10429753B2
Publication date: 2019-10-01
Application number: 15/053,914
Filing date: 2016-02-25
Abstract: An electrophotographic photoconductor comprises a support, an undercoat layer, a charge generation layer, and a hole transport layer in this order. The undercoat layer comprises an electron transport substance, and the charge generation layer comprises a gallium phthalocyanine crystal and an amide compound represented by formula (N1): where R1 represents a methyl group, a propyl group, or a vinyl group. An electrophotographic photoconductor comprises a support, an undercoat layer, a charge generation layer, and a hole transport layer in this order. The undercoat layer comprises an electron transport substance, and the charge generation layer comprises a gallium phthalocyanine ...more ...less
19
US10429752B2
Publication/Patent Number: US10429752B2
Publication date: 2019-10-01
Application number: 16/117,144
Filing date: 2018-08-30
Abstract: Provided is a positively charged electrophotographic photoconductor, a manufacturing method thereof, and an electrophotographic apparatus using the same. The positively charged electrophotographic photoconductor includes an electroconductive support and a single layer-type photosensitive layer provided thereon including a charge generation material, a hole transport material, an electron transport material, and a mixed binder resin. Alternately, the positively charged electrophotographic photoconductor includes an electroconductive support; a charge transport layer provided on the electroconductive support and containing at least a hole transport material, and a binder resin; and a charge generation layer provided on the charge transport layer and including at least a charge generation material, a hole transport material, an electron transport material, and a mixed binder resin. In either embodiment, the mixed binder resin contains at least two resins including a polycarbonate-based resin selected to provide the mixed binder resin with a water vapor permeability ranging from 5 to 13 g/m2·day. Provided is a positively charged electrophotographic photoconductor, a manufacturing method thereof, and an electrophotographic apparatus using the same. The positively charged electrophotographic photoconductor includes an electroconductive support and a single layer-type ...more ...less
20
US10254665B2
Publication/Patent Number: US10254665B2
Publication date: 2019-04-09
Application number: 14/474,794
Filing date: 2014-09-02
Abstract: A photoreceptor for electrophotography includes a photosensitive layer provided on a conductive substrate that contains at least a resin binder, a charge transport material, and an additive. The photoreceptor exhibits high photoresponsivity, stable electrical properties regardless of repeated use thereof, and high durability. The resin binder contains a polycarbonate resin composed of a copolymer having structural units expressed by general formulae (1) and (2) below. The charge transport material contains at least one type of stilbene compound expressed by general formulae (3), (4), and (5) below. The additive contains at least one type of diester compound expressed by general formula (6) below. A photoreceptor for electrophotography includes a photosensitive layer provided on a conductive substrate that contains at least a resin binder, a charge transport material, and an additive. The photoreceptor exhibits high photoresponsivity, stable electrical properties ...more ...less