Electrostatic Carrier Coating with Nitrogen-Containing Particles
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Solution Overview
Problem
The existing carriers for electrostatic image development experience deterioration in charge retention ability when subjected to high stress conditions, such as low area coverage during printing or repeated short print jobs, leading to peeling of the resin coating layer and reduced performance.
Innovation Solution
A carrier with a resin coating layer containing nitrogen-containing silica particles and nitrogen-containing resin fine particles, where the nitrogen-containing silica particles are present in a mass content of 10% to 55% and the nitrogen-containing resin fine particles have a volume average particle diameter of 100 nm to 250 nm, ensuring well-dispersed particles and improved filler effect, thereby maintaining charge retention ability under stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of fine particles are added to the resin coating layer, then the strength of the coating layer is increased and charge retention ability is improved, but the resin coating layer may peel off under high stress conditions leading to deterioration of charge retention ability
Solution Approach 1:
The patent optimizes the particle size parameters of the inorganic particles to a specific range of 0.01 μm to 0.1 μm and controls their content to 1% to 20% by mass. This parameter optimization ensures that the particles provide sufficient filler effect to improve coating layer strength while avoiding excessive particle accumulation that would cause peeling under stress. The specific particle size range allows for effective charge retention without compromising coating integrity.
Solution Approach 2:
The patent creates a composite resin coating layer combining organic resin binder with inorganic particles. This composite structure leverages the filler effect of inorganic particles to enhance coating strength and charge retention ability, while the organic resin matrix maintains coating integrity and prevents peeling under stress. The synergistic combination achieves both improved reliability and maintained stability.
2Reliability
If the resin coating layer contains fine particles to improve charge retention ability, then the coating layer strength increases, but the coating layer may peel off during repeated short print jobs or long print runs
Solution Approach 1:
The patent specifies precise parameter ranges for the inorganic particles: particle diameter of 0.01 μm to 0.1 μm and content of 1% to 20% by mass. These optimized parameters ensure the coating layer maintains sufficient strength for charge retention while resisting peeling during extended operation. The particle size and concentration are controlled to prevent degradation over thousands of printing cycles.
Solution Approach 2:
The patent incorporates inorganic particles into the resin coating layer beforehand to create a reinforced structure that prevents peeling before it occurs. The particles act as a cushioning reinforcement that withstands mechanical stress during repeated printing operations, protecting the coating layer integrity throughout the carrier's operational lifespan.
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 proposed carrier structure enhances charge retention ability by preventing particle segregation and maintaining the integrity of the resin coating layer even under high-stress conditions, such as low area coverage or long print runs, thereby extending the carrier's operational lifespan.
Implementation Method 1
the strength of the coating layer is increased due to the filler effect
Implementation Method 2
the surface exposure ratio of the nitrogen-containing resin particles is from 0.8% to 3.0% inclusive
Data Source
AI summary
A carrier for electrostatic image development includes: a core material; and a resin coating layer that contains nitrogen-containing silica particles and nitrogen-containing resin fine particles and covers the core material. The content of the nitrogen-containing silica particles is from 10% by mass to 55% by mass inclusive based on the total mass of the resin coating layer. The nitrogen-containing resin fine particles have a volume average particle diameter of from 100 nm to 250 nm inclusive. The mass ratio P/S of the mass P of the nitrogen-containing resin fine particles to the mass S of the nitrogen-containing silica particles is from 0.15 to 0.55 inclusive.