Silane-Treated Positive Toner for Stable Charge and Transfer
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Solution Overview
Problem
Conventional toners suffer from low transfer efficiency and inadequate charging stability due to the adhesion of negatively chargeable resin and positively chargeable inorganic particles on toner mother particles, leading to mechanical stress and increased adhesion to the photosensitive drum.
Innovation Solution
A positively chargeable toner with resin-containing particles, treated with a silane coupling agent and containing an anionic surfactant, is developed, with a primary particle diameter of 60-100 nm and coverage rate of 15-30%, to reduce adhesion force and improve transfer efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If negatively chargeable resin and positively chargeable inorganic particles are adhered to toner mother particles, then transfer efficiency is improved, but charging stability deteriorates due to mechanical stress and increased adhesion to photosensitive drum
Solution Approach 1:
The patent changes the particle size parameter of resin-containing particles to a specific range (0.03 μm to 0.08 μm, preferably 0.05 μm to 0.07 μm) and controls the area ratio of coverage (10% to 30%, preferably 15% to 25%). These parameter optimizations reduce mechanical stress on the toner mother particle while maintaining sufficient adhesion to the photosensitive drum, thereby improving charging stability without sacrificing transfer efficiency.
Solution Approach 2:
The patent uses composite resin-containing particles that combine resin with anionic surfactants and silane coupling agents. This composite structure provides both the adhesion needed for transfer efficiency and the controlled electrostatic properties needed for charging stability, resolving the contradiction between the two requirements.
2Productivity
If external additives are adhered to toner mother particles, then transfer efficiency is improved, but mechanical stress increases leading to carrier contamination
Solution Approach 1:
By optimizing the particle size of resin-containing particles to 0.03 μm to 0.08 μm and controlling the coverage area ratio to 10% to 30%, the patent reduces the mechanical stress generated by external additives during toner movement. This minimizes particle fragmentation and prevents carrier contamination while maintaining effective transfer efficiency.
Solution Approach 2:
The patent applies resin-containing particles with specific properties (small size, controlled coverage) only where needed on the toner mother particle surface. This localized approach provides sufficient adhesion for transfer efficiency while limiting the total amount of external additives that could generate mechanical stress and cause carrier contamination.
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 achieves enhanced transfer efficiency and improved charging stability by minimizing adhesion to the photosensitive drum, reducing mechanical stress, and preventing carrier contamination.
Implementation Method 1
The resin-containing particle is surface treated with a silane coupling agent
Implementation Method 2
The resin-containing particle further contains an anionic surfactant
Implementation Method 3
improve transfer efficiency and stability by minimizing adhesion to the photosensitive drum
Data Source
AI summary
The positively chargeable toner contains toner particles. Each of the toner particles includes a toner mother particle, and an external additive adhering to a surface of the toner mother particle. The external additive includes a resin-containing particle in which resin is contained. The resin-containing particle further contains an anionic surfactant. The resin-containing particle is surface treated with a silane coupling agent. A number-base-mean primary particle diameter of the resin-containing particles is within a range of 60 nm to 100 nm. An area ratio of a region covered by the resin-containing particle out of a surface region of the toner mother particle is within a range of 15% to 30%.