Toner Binder Composite Resin Fixing Temperature Range
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Solution Overview
Problem
Conventional toner binders fail to achieve a balance between low temperature fixing properties and hot offset resistance, and storage stability, especially in high-speed and energy-efficient copiers/printers, which demand improved environmental sustainability and charging characteristics.
Innovation Solution
A toner binder comprising a specific blend of polyester resins with a high proportion of aliphatic diols and monocarboxylic acids, optimized for a wide range of fixing temperatures and enhanced blocking resistance, charging characteristics, and storage stability, achieved through a precise polycondensation process and catalyst selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If incompatible resins specialized in low temperature range and high temperature range are used as matrix phase and domain phase, then fixing performance is improved, but storage stability deteriorates
Solution Approach 1:
The invention uses a composite resin system consisting of a matrix resin and dispersed resin particles. The matrix resin provides baseline fixing performance while the dispersed resin particles (specialized for specific temperature ranges) enhance overall fixing performance across different temperatures. This composite structure allows the system to achieve both improved fixing performance and maintained storage stability by distributing functional requirements across different material components.
2Stability of the object's composition
If a polyester resin is used to improve blocking resistance, then storage stability is improved, but fixing temperature range and charging characteristics deteriorate
Solution Approach 1:
The invention creates a composite resin system where a polyester resin matrix (providing blocking resistance) contains dispersed resin particles with different thermal and electrical properties. This composite structure allows the polyester resin to provide storage stability and blocking resistance while the dispersed particles contribute to broader fixing temperature range and improved charging characteristics, thereby resolving the trade-off between storage stability and adaptability.
3Reliability
If a compatibilizing agent is added to compatibilize incompatible resins, then fixing performance is improved, but device complexity increases
Solution Approach 1:
The invention applies local quality by creating resin particles with specific localized properties (different glass transition temperatures, charging characteristics) dispersed within the matrix resin. Each dispersed particle acts as a localized functional unit that contributes specific properties to the overall system. This approach achieves improved fixing performance through functional differentiation rather than through complex compatibilizing agents, thereby reducing compositional complexity while maintaining reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The toner binder provides improved fixing temperature range, excellent blocking resistance, and superior charging characteristics, ensuring stable performance in high-speed and energy-efficient imaging devices while maintaining storage stability.
Implementation Method 1
a polyester resin (P) comprising one or more types of polyester resins obtained by polycondensation of a carboxylic acid component (x) and an alcohol component (y)
Data Source
AI summary
Provided is a toner binder having excellent charging characteristics and blocking resistance, and an increased range of fixing temperatures when used as a toner. The present invention is a toner binder containing a polyester resin (P) comprising one or more types of polyester resins obtained by polycondensation of a carboxylic acid component (x) and an alcohol component (y), wherein at least one type (P1) of (P) contains 50 to 95 mol% of a aliphatic diol (y1) having a carbon number of 2 to 4 in the alcohol component (y), and (P) satisfies expressions (1) and (2). 11.5≤SP valuecal/cm31/2ofP≤13.0 5.2≤HLB valueby Oda methodofP≤7.1