Image bearing material, electrophotographic photoreceptor using the image bearing material, and image forming apparatus using the photoreceptor
AssigneeRicoh Company, Ltd.
InventorsKohkoku Ri, Masaomi Sasaki, Kazukiyo Nagai, Shinichi Kawamura
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Abstract
An image bearing material including a matrix resin and, within the matrix resin, a core/shell graft copolymer including a core including one or more polymers and a shell including a graft polymer which has a linear chain connected with the core and which is formed from one or more monomers. The image bearing material is preferably used for a surface layer of an electrophotographic photoreceptor, an intermediate transfer medium, and the like image bearing members to improve the abrasion resistance thereof.
Claims50
An image bearing material comprising a matrix resin in a surface layer and, within said matrix resin, a core/shell graft copolymer, wherein said core/shell graft copolymer comprises a core comprising a one or more polymers and a shell comprising a graft polymer which has a linear chain connected with the core and which is formed from one or more monomers, and wherein said core/shell polymer is present at less than 20 weight % in said surface layer.
An electrophotographic photoreceptor comprising an electroconductive substrate and a photosensitive layer overlying the electroconductive substrate, wherein the photosensitive layer comprises a matrix resin in a surface layer and, within said matrix resin, a core/shell graft copolymer, and wherein the core/shell graft copolymer comprises a core, said core comprising one or more polymers and a shell comprising a graft polymer which has a linear chain connected with the core and which is formed from one or more monomers, and wherein said core/shell polymer is present at less than 20 weight % in said surface layer.
An electrophotographic image forming apparatus comprising:
- an electrophotographic photoreceptor;
- a charging device configured to charge the photoreceptor;
- a light irradiating device configured to irradiate the charged photoreceptor with light to form an electrostatic latent image on the photoreceptor;
- a developing device configured to develop the electrostatic latent image with a toner to form a toner image on the photoreceptor;
- a transfer device configured to transfer the toner image onto a receiving material;
- and
- a cleaning device configured to clean a surface of the photoreceptor,
- wherein the photoreceptor comprises an electroconductive substrate and a photosensitive layer overlying the electroconductive substrate, wherein the photosensitive layer comprises a matrix resin in a surface layer and, within the matrix resin, a core/shell graft copolymer, and wherein the core/shell graft copolymer comprises a core comprising one or more polymers and a shell comprising a graft polymer which has a linear chain connected with the core and which is formed from one or more monomers, and wherein said core/shell polymer is present at less than 20 weight % in said surface layer.
A process cartridge comprising:
- an electrophotographic photoreceptor;
- and at least a device selected from the group consisting of:
- a charging device configured to charge the photoreceptor;
- a light irradiating device configured to irradiate the charged photoreceptor with light to form an electrostatic latent image on the photoreceptor;
- a developing device configured to develop the electrostatic latent image with a toner to form a toner image on the photoreceptor;
- a transfer device configured to transfer the toner image onto a receiving material;
- and
- a cleaning device configured to clean a surface of the photoreceptor,
- wherein the process cartridge can be attached to and detached from an electrophotographic image forming apparatus,
- wherein the photoreceptor comprises an electroconductive substrate and a photosensitive layer overlying the electroconductive substrate, wherein the photosensitive layer comprises a matrix resin in a surface layer and, within the matrix resin, a core/shell graft copolymer, and wherein the core/shell graft copolymer comprises a core comprising one or more polymers and a shell comprising a graft polymer which has a linear chain connected with the core and which is formed from one or more monomers, and wherein said core/shell polymer is present at less than 20 weight % in said surface layer.
An image bearing member on which an electrostatic latent image is to be formed, comprising an electroconductive substrate and a surface layer comprising a matrix resin in a surface layer and, within the matrix resin, a core/shell graft copolymer, wherein the core/shell graft copolymer comprises a core comprising one or more polymers and a shell comprising a graft polymer which has a linear chain connected with the core and which is formed from one or more monomers, and wherein said core/shell polymer is present at less than 20 weight % in said surface layer.
An intermediate transfer medium on which a toner image is to be formed, comprising an electroconductive substrate and a surface layer comprising a matrix resin in said surface layer and, within the matrix resin, a core/shell graft copolymer, wherein the core/shell graft copolymer comprises a core comprising one or more polymers and a shell comprising a graft polymer which has a linear chain connected with the core and which is formed from one or more monomers, and wherein said core/shell polymer is present at less than 20 weight % in said surface layer.
Dependencies are inferred from the claim text.