Binder resin composition for toner

The binder resin composition for toner, using a specific blend of amorphous and crystalline polyester resins, addresses environmental concerns and enhances durability and productivity by improving dispersibility and pulverization efficiency.

JP2025102131APending Publication Date: 2025-07-08KAO CORP
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Patent Information

Application Number
JP2023219387
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

The use of petroleum-derived polyester resins in toner binder materials leads to environmental concerns, and combining amorphous and crystalline polyester resins for improved low-temperature fixability results in decreased dispersibility, affecting durability and productivity.

Method used

A binder resin composition comprising an amorphous polyester resin made from polyethylene terephthalate, an aromatic diol, and an aliphatic diol with a hydroxyl group bonded to a secondary carbon atom, along with a crystalline polyester resin containing an isophthalic acid-based compound, enhances dispersibility and improves durability and productivity.

Benefits of technology

The composition achieves excellent productivity and durability by finely dispersing crystalline polyester resin domains, suppressing exposure on the toner surface and facilitating easier pulverization, thereby improving toner production efficiency.

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Abstract

To provide a binder resin composition for a toner with an excellent productivity and durability, 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 containing an aromatic diol and an aliphatic diol having a hydroxyl group bonded to a secondary carbon atom, and the carboxylic acid component containing an isophthalic acid-based compound. 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

  • Toner binder resin composition

    JP2016090854A

  • Non-crystalline polyester resin, toner binder resin and toner for electrostatic image development

    JP2019099699A

  • Toner binder and toner

    JP2023010575A

  • Resin particle, toner, developer, developer storage container, method for manufacturing resin particle, method for manufacturing toner, image forming apparatus, and image forming method

    JP2023067691A