Toner Surface Layer with Organic Silicon Polymer for Image Quality
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Solution Overview
Problem
Current toners face challenges in maintaining high-definition image quality and durability across varying temperatures and humidity levels, with issues such as bleeding of release agents and resin components leading to soiling of parts and degradation in image density, while existing solutions like inorganic fine particles and silane coatings have limitations in durability and environmental stability.
Innovation Solution
A toner with a surface layer containing an organic silicon polymer, formed by polymerizing a compound represented by a specific formula, which enhances hydrophobicity and charge stability, reducing bleeding and soiling, and improving fixability and color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic fine particles are strongly fixed to toner particle surfaces, then high-temperature storage stability is improved, but bleeding of release agent and resin component occurs through gaps between particles
Solution Approach 1:
The patent uses a composite coating system combining inorganic fine particles (such as silica) with an organic silicon polymer matrix. This composite structure fills the gaps between inorganic particles, creating a continuous protective barrier that prevents bleeding of release agent and resin component while maintaining the heat resistance and storage stability provided by the inorganic particles.
Solution Approach 2:
The patent applies different materials with specific local functions: inorganic fine particles provide heat resistance and structural stability, while the organic silicon polymer provides a continuous protective matrix that prevents bleeding. This local differentiation of material properties addresses both the storage stability and bleeding prevention requirements.
2Manufacturing precision
If silane coupling agent is added to prevent colorants and polar substances from becoming exposed, then charge amount distribution is improved, but hydrolytic polycondensation is insufficient and environmental stability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the silane coupling agent by selecting compounds with specific functional groups (such as alkoxy groups instead of hydroxyl groups) and adjusting the molecular structure to control the rate and extent of hydrolytic polycondensation. This ensures sufficient polycondensation occurs to form a stable protective layer while maintaining good charge amount distribution.
Solution Approach 2:
The organic silicon polymer acts as an intermediary substance that bridges the inorganic fine particles and the toner particle surface. It provides a continuous protective layer that enhances environmental stability while allowing the silane coupling agent to effectively control charge amount distribution through its chemical properties.
3Temperature
If binder resin suitable for low temperature fixing is selected, then fixability is improved, but developing performance and durability are significantly affected
Solution Approach 1:
The patent applies a thin protective film of organic silicon polymer on the toner particle surface that acts as a flexible barrier. This film allows the binder resin to provide low-temperature fixability while the protective film maintains developing performance and durability by preventing degradation of the toner surface during development and storage.
4Reliability
If toner surface properties are made stable in various environments, then chargeability stability is improved, but soiling of parts such as developing roller and photosensitive drum occurs
Solution Approach 1:
The patent uses a composite protective layer of inorganic fine particles embedded in an organic silicon polymer matrix. This composite structure provides stable surface properties that ensure consistent chargeability across various environments while the hydrophobic characteristics of the organic silicon polymer prevent soiling of parts by reducing adhesion of toner particles to rollers and drums.
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 improved environmental stability, low-temperature fixability, and development durability, with enhanced storage stability and reduced soiling of parts, maintaining high-definition image quality across different environments.
Implementation Method 1
which enhances hydrophobicity and charge stability, reducing bleeding and soiling
Implementation Method 2
enhances hydrophobicity and charge stability, reducing bleeding and soiling
Implementation Method 3
One way to address this challenge is to cover the surface of a toner particle with a resin
Data Source
AI summary
A toner having good environmental stability, low-temperature fixability, development durability, and storage stability is provided. A toner includes toner particles each including a surface layer that contains an organic silicon polymer. The organic silicon polymer is obtained by polymerizing a compound having a specific structure. The surface layers have a particular average thickness Dav. In mapping by focused-ion-beam time-of-flight secondary ion mass spectroscopy, a ratio of silicon ions to carbon ions released from the toner particles upon irradiation of toner particle surfaces with primary ions is a particular value.