Toner Resin Particle Embedment for Charge Stability
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Solution Overview
Problem
Existing toners face challenges in maintaining charge stability and heat-resistant preservability, particularly in high-temperature environments, due to agglomeration and detachment of resin particles from toner mother particles, leading to carrier contamination and impaired charging ability.
Innovation Solution
A toner composition featuring toner mother particles with a binder resin and external resin particles, where the resin particles have an embedded and protruding portion structure with specific ratios and solubility parameter differences, ensuring opposite chargeability and optimal embedment ratios to inhibit agglomeration and detachment, thereby enhancing charge stability and heat-resistant preservability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resin particles are added as external additive to toner particles, then chargeability is improved, but resin particles detach in high-temperature environments causing carrier contamination
Solution Approach 1:
The resin particles are embedded within the toner mother particle, creating a nested structure where the resin particle is partially contained inside and partially protruding from the toner particle. This nesting approach prevents the resin particles from detaching and contaminating the carrier, while still maintaining the improved chargeability benefit.
Solution Approach 2:
The resin particles are positioned with specific local characteristics - an embedded portion inside the toner particle and a protruding portion outside. This local quality differentiation allows the resin to provide chargeability enhancement at the surface while the embedded portion anchors it securely to prevent detachment.
2Reliability
If resin particles are embedded in toner mother particles, then charge stability is improved, but heat-resistant preservability deteriorates due to agglomeration
Solution Approach 1:
The patent specifies precise parameter ranges for the resin particle embedding - the ratio of embedded portion to total diameter is controlled at 0.3-0.7, and the resin particle diameter is limited to 0.1-1.0 μm. These parameter changes optimize both charge stability and heat-resistant preservability by preventing agglomeration while maintaining chargeability.
3Reliability
If resin particles protrude from toner particles, then charging ability is enhanced, but detachment occurs leading to loss of substance
Solution Approach 1:
The resin particles are nested within the toner particle structure with a controlled embedding ratio, ensuring that while part of the resin particle protrudes to enhance charging ability, the embedded portion securely anchors it to prevent complete detachment and substance loss.
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 exhibits excellent charge stability and heat-resistant preservability, preventing agglomeration and carrier contamination, and maintaining effective charging performance even in high-temperature conditions.
Implementation Method 1
The toner mother particles have a chargeability opposite to a chargeability of the resin particles
Data Source
AI summary
A toner includes toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive. The external additive includes resin particles. The toner mother particles have a chargeability opposite to a chargeability of the resin particles. Each of the resin particles has an embedded portion embedded in a surface portion of the toner mother particle and a protruding portion protruding outward from the toner mother particle in a radial direction of the toner mother particle. In a cross section of the resin particle, a relationship 0.60≤LA/(LA+LB)≤0.80 is satisfied where LA represents a maximum length of the embedded portion in the radial direction of the toner mother particle and LB represents a maximum length of the protruding portion in the radial direction of the toner mother particle.