Core-Shell Hybrid Toner Particles for High-Speed Printing
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Solution Overview
Problem
Current hybrid toner particles for high-speed printing, particularly monochrome printing, face challenges with flow, charging, toner usage, and drum contamination, requiring improved formulations for enhanced performance.
Innovation Solution
Development of hybrid toner particles with a core-shell structure comprising polyester and styrene acrylate polymers, where the core includes a mixture of polyester and styrene acrylate polymers, and the shell is predominantly polyester, optimized through a continuous coalescence process to achieve improved fusing latitude and reduced contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional emulsion aggregation processes are used to form toner particles, then the basic toner structure is achieved, but the flow, charging, and drum contamination properties are insufficient for high-speed printing
Solution Approach 1:
The toner particle is segmented into a core-shell structure where the core contains polyester polymer and the shell contains styrene acrylate polymer. This segmentation allows each layer to perform its specific function: the polyester core provides melting and fusing properties, while the styrene acrylate shell provides flow and charging characteristics, thereby improving reliability without causing drum contamination
Solution Approach 2:
The invention uses composite materials by combining polyester polymer and styrene acrylate polymer in a core-shell structure. This composite approach leverages the complementary properties of both materials to achieve improved flow, charging, and contamination resistance performance required for high-speed printing
2Adaptability or versatility
If a single-polymer toner formulation is used, then the manufacturing process is simple, but the fusing latitude and hot offset temperature are limited
Solution Approach 1:
The toner particle is divided into core and shell segments with different polymer compositions. The polyester core provides a broad fusing latitude by controlling melting behavior, while the styrene acrylate shell maintains structural integrity. This segmentation enables the toner to adapt to a wider range of fusing conditions without excessive structural complexity
Solution Approach 2:
Different regions of the toner particle have different local qualities: the core region contains polyester with specific melting properties for broad fusing latitude, while the shell region contains styrene acrylate for structural stability. This local differentiation allows the particle to exhibit both adaptability in fusing conditions and controlled complexity in structure
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 hybrid toner particles exhibit improved flow, charging characteristics, and reduced drum contamination, with a wider fusing latitude and higher hot offset temperature, enhancing printing performance and efficiency.
Implementation Method 1
the resulting aggregated toner particles may be heated in a batch or continuous process to allow coalescence/fusing to occur
Implementation Method 2
The resulting aggregated toner particles may be heated in a batch or continuous process to allow coalescence/fusing to occur
Data Source
AI summary
The disclosure provides a toner composition comprising toner particles with a core and a shell, wherein the core comprises a polyester polymer and a styrene acrylate polymer, and the shell comprises a polyester polymer and, optionally, a styrene acrylate polymer, either or both of which can be the same or different from that in the core.