Electrostatic Toner Composite Core Shell Layer Hot Offset
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Solution Overview
Problem
Conventional electrostatic latent image developing toners face issues with adhesiveness and chargeability, leading to carrier contamination and image quality deterioration, especially in high-temperature and high-humidity environments, due to excessive releasing agent precipitation and low elasticity.
Innovation Solution
The toner particles comprise a composite core with a shell layer and organic particles, where the shell layer has a glass transition point of 50-90°C and the organic particles contain a releasing agent with a glass transition point of 90-110°C, ensuring the releasing agent is supplied to the core during fixing and maintaining chargeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a releasing agent is added to improve releasability, then hot offset is reduced, but the releasing agent precipitates excessively in high-temperature and high-humidity environments, causing adhesiveness issues and carrier contamination
Solution Approach 1:
The patent changes the glass transition temperature parameter of the resin from conventional values to specifically 50-90°C, and the releasing agent's glass transition temperature to 90-110°C. This parameter optimization allows the releasing agent to remain stable and non-precipitating in high-temperature environments while still providing effective releasability, thus reducing hot offset without causing excessive precipitation or carrier contamination
Solution Approach 2:
The patent creates a composite structure where resin fine particles containing the releasing agent are combined with a binder resin. The resin has a glass transition point of 50-90°C and the releasing agent has a glass transition point of 90-110°C. This composite material approach ensures that the releasing agent is properly dispersed and stabilized within the resin matrix, preventing precipitation while maintaining releasability and reducing hot offset
2Ease of operation
If the toner has low elasticity to improve fixability, then low-temperature fixability is enhanced, but adhesiveness increases causing carrier contamination and image quality deterioration
Solution Approach 1:
The patent optimizes the glass transition temperature parameter of the resin to 50-90°C, which provides the right balance of elasticity and adhesiveness. This parameter change enables the toner to have sufficient elasticity for good low-temperature fixability while maintaining controlled adhesiveness that prevents carrier contamination and image quality deterioration
3Ease of operation
If the resin glass transition point is lowered to improve low-temperature fixability, then fixing at lower temperatures becomes possible, but the toner loses elasticity and becomes too adhesive
Solution Approach 1:
The patent identifies and optimizes the glass transition temperature parameter of the resin to a specific range of 50-90°C. This parameter optimization achieves the dual benefit of enabling low-temperature fixability while preserving sufficient toner elasticity, avoiding the problem of excessive adhesiveness that would occur with lower glass transition temperatures
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
This configuration enhances the toner's releasability, prevents precipitation, and improves elasticity, resulting in better image quality and a wider fixing operation window, while reducing hot offset and maintaining high-temperature preservability and low-temperature fixability.
Implementation Method 1
The shell layer contains a first resin having a glass transition point of at least 50° C. and no greater than 90° C. The organic particles each contain a releasing agent and a second resin having a glass transition point of at least 90° C. and no greater than 110° C.
Data Source
AI summary
An electrostatic latent image developing toner includes a plurality of toner particles each including a composite core and a shell layer covering a surface of the composite core. The composite core is a composite of a toner core and a plurality of organic particles each adhering to a surface of the toner core. The shell layer contains a first resin having a glass transition point of at least 50° C. and no greater than 90° C. The organic particles each contain a releasing agent and a second resin having a glass transition point of at least 90° C. and no greater than 110° C.