Emulsion Aggregation Toner Composition with Composite Resin System
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Solution Overview
Problem
Current emulsion aggregation toners face challenges in achieving high-speed printing with excellent release and hot offset characteristics while maintaining low minimum fixing temperatures and suitable small toner particle sizes.
Innovation Solution
A toner composition comprising a blend of low molecular weight, high molecular weight, and crystalline amorphous polyester resins, wax, biocide, and colorant, with specific weight percentages and molecular weight ranges, optimized for a minimum fusing temperature of 100°C to 125°C and hot offset temperature of 215°C to 250°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If lower minimum fixing temperature toners are used, then print productivity increases and fusing temperatures decrease, but release and hot offset characteristics deteriorate
Solution Approach 1:
The patent employs a composite resin system combining three distinct polyester resin components with specific molecular weights and crystallinities. This composite approach allows the toner to achieve low minimum fixing temperature (improving productivity) while maintaining appropriate release and hot offset characteristics (preserving reliability) through the synergistic effects of the resin blend.
Solution Approach 2:
The patent systematically adjusts critical parameters including the molecular weight distribution of polyester resins, crystallinity percentages, and resin composition ratios. By optimizing these parameters within specific ranges, the toner achieves the desired balance between low fusing temperature and adequate release/hot offset performance.
2Manufacturing precision
If smaller toner particle sizes are used, then printing quality improves, but manufacturing complexity increases
Solution Approach 1:
The patent extracts and eliminates unnecessary manufacturing steps by using a simplified emulsion aggregation process that directly produces uniform small particles without requiring complex post-processing equipment or multiple manufacturing stages.
Solution Approach 2:
The patent controls particle size and uniformity by optimizing emulsion aggregation parameters including resin emulsion concentration, aggregation agent dosage, and mixing conditions, achieving consistent small particle sizes through parameter control rather than complex manufacturing systems.
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 composition enables high-speed printing with improved release and hot offset characteristics, maintaining low fusing temperatures and suitable particle sizes, enhancing print productivity and reducing energy consumption.
Implementation Method 1
The aggregated toner particles are heated to enable coalescence/fusing, thereby achieving aggregated, fused toner particles
Data Source
AI summary
A toner composition that includes at least one low molecular weight amorphous polyester resin, at least one high molecular weight amorphous polyester resin, at least one crystalline polyester resin, at least one wax, at least one biocide and at least one colorant, and wherein the toner composition has a minimum fusing temperature of from about 100° C. to about 125° C.