Cross-linked Polyester Resin Particles in Toner for Polishing
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Solution Overview
Problem
Toner particles used in electrophotographic image forming methods tend to cause filming on the surface of electrostatic latent image bearing members, leading to image defects and reduced image quality due to insufficient polishing of non-imaged portions.
Innovation Solution
A developer comprising toner particles with a binder resin and magnetic powder, combined with cross-linked polyester resin particles and an external additive, is used to scrape off residual toner and resin particles from the image bearing member, enhancing polishing characteristics and preventing filming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If toner particles are used for image formation, then image formation is achieved, but filming occurs on the surface of the image bearing member
Solution Approach 1:
Cross-linked polyester resin particles are introduced as intermediary abrasive particles that perform polishing action on the image bearing member surface. These particles mechanically remove filmed toner residues through abrasion, acting as a mediator between the harmful filming effect and the desired clean surface state.
Solution Approach 2:
The invention changes the physical parameters of the developer by adding particles with specific size distribution (2-30 μm) and specific material properties (cross-linked polyester resin). This parameter change enables the developer to perform dual functions: image formation and surface polishing, thereby preventing filming.
2Object-generated harmful factors
If polishing is insufficient, then filming prevention is reduced, but polishing action requires additional components
Solution Approach 1:
The cross-linked polyester resin particles serve multiple functions simultaneously: they act as abrasive particles for polishing the image bearing member surface, and they become part of the developer composition that participates in the image formation process. This multi-functionality reduces the need for separate polishing mechanisms.
Solution Approach 2:
The invention merges the image formation function and the surface polishing function into a single developer composition. By combining toner particles with cross-linked polyester resin particles, the system achieves both functions through one applied material, simplifying the overall structure.
3Reliability
If external additive is used for toner particles, then toner properties are improved, but inconsistent treatment leads to poor polishing characteristics
Solution Approach 1:
The invention applies external additive treatment homogeneously to both toner particles and cross-linked polyester resin particles using the same treatment process. This ensures consistent surface properties and charge characteristics across all particles in the developer, leading to reliable polishing characteristics and uniform behavior during image formation.
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 solution effectively reduces image defects by ensuring thorough polishing of both imaged and non-imaged portions, maintaining image quality and preventing layer turbulence and offset issues.
Implementation Method 1
scraping: scraping off toner particles and cross-linked polyester resin particles remaining on a surface of an image bearing member using a cleaning member
Implementation Method 2
scraping off toner particles and cross-linked polyester resin particles remaining on a surface of an image bearing member using a cleaning member
Implementation Method 3
The toner particles and the cross-linked polyester resin particles are externally treated with the external additive in the same manner
Data Source
AI summary
A developer of the present disclosure contains: toner particles each containing a binder resin and a magnetic powder; cross-linked polyester resin particles having a particle size of 2 μm or more and 30 μm or less; and an external additive. The toner particles and the cross-linked polyester resin particles are externally treated with the external additive in the same manner.