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
View PDF 7 Cites 0 Cited by

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.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 0007882418000035
    Figure 0007882418000035
  • Figure 0007882418000036
    Figure 0007882418000036
  • Figure 0007882418000037
    Figure 0007882418000037
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Electrophotographic photoreceptor, method of producing the same, and image forming apparatus using the same

    JP2010033034A

  • Electrophotographic photosensitive member, process cartridge, and image forming device

    JP2010224304A

  • Electrophotographic photoreceptor, and image forming method, image forming apparatus and process cartridge

    JP2011039158A

  • Manufacturing method of xerographic photoreceptor and xerographic photoreceptor manufactured by the manufacturing method

    JP2019045862A

  • Electrophotographic photoreceptor, electrophotographic image forming apparatus, and electrophotographic image forming method

    JP2021165805A