Toner for developing electrostatic images

JP7863487B2Active Publication Date: 2026-05-21KAO CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
KAO CORP
Filing Date
2022-09-22
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing toners with external additives of opposite polarity to the toner matrix particles detach easily under low temperature and low humidity conditions, leading to reduced charge and fogging issues.

Method used

The use of silica particles with a specific shape index of 2.0 or higher, opposite in charge polarity to the toner matrix particles, which adhere firmly due to electrostatic force, reducing detachment and silica particle rolling.

Benefits of technology

The solution effectively suppresses fogging under low temperature and low humidity conditions by maintaining charge stability and preventing silica particle detachment from the toner matrix.

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Patent Text Reader

Abstract

To provide an electrostatic charge image developing toner which suppresses fogging in a low-temperature, low-humidity environment.SOLUTION: An electrostatic charge image developing toner is provided, comprising toner base particles containing a binder resin and colorant, and an external additive containing silica particles A charged with a polarity opposite that of the toner base particles, the silica particles A having a shape index of 2.0 or greater as expressed as a ratio of a number average particle diameter to a BET equivalent particle diameter.SELECTED DRAWING: None
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Citation Information

Patent Citations

  • Image forming device

    JP2002318467A

  • Toner for electrostatic charge image development

    JP2014142605A

  • Toner for electrostatic charge image development, two-component developer, and image forming apparatus

    JP2014164034A

  • Image forming method and image forming apparatus

    JP2015096885A

  • Toner for electrostatic charge image development

    JP2015210410A