Binder resin composition for toner

A binder resin composition combining amorphous and crystalline polyester resins with polyethylene glycol and aliphatic diol components addresses the challenge of achieving low-temperature fixability and storage stability in toner compositions, enhancing dispersibility and color development.

JP2025102133APending Publication Date: 2025-07-08KAO CORP
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Patent Information

Application Number
JP2023219389
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-12-26
Publication Date
2025-07-08

AI Technical Summary

Technical Problem

Existing toner compositions struggle to achieve both low-temperature fixability and storage stability due to the low dispersibility of crystalline polyester resin with amorphous polyester resin using an aliphatic diol, which affects the toner's performance in electrostatic charge image development.

Method used

A binder resin composition combining an amorphous polyester resin made from polyethylene glycol, an aliphatic diol, and a carboxylic acid component with a crystalline polyester resin, enhancing dispersibility and promoting crystallization of the crystalline resin for improved low-temperature fixability and storage stability.

Benefits of technology

The composition achieves excellent low-temperature fixability and storage stability by ensuring high dispersibility and affinity between resin components, improving color development properties and toner image quality.

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Abstract

To provide a binder resin composition for a toner which can attain both a low-temperature fixability and a storage property at the same time, and a toner for developing an electrostatic charge image containing the binder resin composition.SOLUTION: A binder resin composition for a toner includes an amorphous polyester resin A and a crystalline polyester resin C, the amorphous polyester resin A being a polycondensate of an alcohol component and a carboxylic acid component, the alcohol component containing polyethylene glycol and an aliphatic diol. Also disclosed is a toner for developing electrostatic images containing the binder resin composition.SELECTED DRAWING: None
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Citation Information

Patent Citations

  • Crosslinked polyester resin for toner

    JP1995152201A

  • Electrophotographic toner

    JP2009139421A