Binder resin composition for toner

The combination of amorphous and crystalline polyester resins with sulfonic acid groups in toner formulations addresses the low chargeability and fixability issues, enhancing toner performance through improved chargeability and color developability.

JP2025102132APending Publication Date: 2025-07-08KAO CORP
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Patent Information

Application Number
JP2023219388
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

Conventional toner formulations using crystalline polyester resins face challenges in achieving high chargeability due to low resistance and insufficient incorporation of sulfonic acid or sulfonate groups, which affect low-temperature fixability and color developability.

Method used

A binder resin composition combining amorphous polyester resin with crystalline polyester resin, where the amorphous resin is a polycondensate of alcohol and carboxylic acid components, including monomers with sulfonic acid or sulfonate groups, is used to enhance chargeability and color developability by promoting uniform incorporation of these groups through transesterification.

Benefits of technology

The binder resin composition exhibits improved chargeability and color developability, with the sulfonic acid groups enhancing the affinity for colorants, leading to better dispersion and fixing properties at lower temperatures.

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Abstract

To provide a binder resin composition for toner with an excellent charging property, and a toner for developing an electrostatic charge image containing the binder resin composition.SOLUTION: The present invention relates to a binder resin composition for a toner including: an alcohol component; a carboxylic acid component, an amorphous polyester resin A which is a polycondensate of polyethylene terephthalate, and a crystalline polyester resin C, the alcohol component and / or the carboxylic acid component containing a monomer having a sulfonic acid group and / or a sulfonate group. The present invention also relates to a toner for an electrostatic charge image development containing the binder resin composition.SELECTED DRAWING: None
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Citation Information

Patent Citations

  • Polyester resin for toner

    JP1994118705A

  • Toner

    JP2011017807A

  • Toner and developer

    JP2016164612A