Electrophotographic photoreceptor, method for manufacturing an electrophotographic photoreceptor, process cartridge, and image forming apparatus
The photoreceptor's protective layer with a specific hardness ratio and photocurable resin composition addresses image flow issues by ensuring adequate surface hardness, preventing blurring in electrophotographic imaging.
JP7882418B2Active Publication Date: 2026-06-30KYOCERA DOCUMENT SOLUTIONS INC
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- KYOCERA DOCUMENT SOLUTIONS INC
- Filing Date
- 2024-05-20
- Publication Date
- 2026-06-30
AI Technical Summary
Technical Problem
Existing electrophotographic photoreceptors with a protective layer containing a photocurable resin are prone to image flow during image formation.
Method used
The photoreceptor includes a protective layer with a photocurable resin containing repeating units derived from compounds with one polymerizable functional group and three or more polymerizable functional groups, ensuring a Martens hardness ratio of 1.1 or greater at specific indentation depths to enhance surface hardness and inhibit photocuring near the surface.
Benefits of technology
This configuration effectively suppresses image flow by maintaining sufficient hardness near the surface of the protective layer, preventing image blurring even when using a photocurable resin.
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Smart Images
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Abstract
This electrophotographic photoreceptor comprises an electroconductive substrate (2), a photosensitive layer (3), and a protective layer (5). The photosensitive layer (3) contains a charge generator and a hole transporter. The protective layer (5) is the outermost layer of the electrophotographic photoreceptor. The protective layer (5) contains a photocurable resin. The photocurable resin has: a repeating unit derived from a compound having one polymerizable functional group; and a repeating unit derived from a compound having three or more polymerizable functional groups. The ratio B / A of B to A is 1.1 or more, where A is the Martens hardness of the protective layer (5) at a press depth of 0.4 μm, and B is the Martens hardness of the protective layer (5) at a press depth of 0.1 μm.
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