Tin Oxide Core-Shell Toner Additive for Ghosting and Density
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Solution Overview
Problem
Existing toner compositions face challenges in meeting environmental regulations due to the use of titanium dioxide, which requires labeling, and suffer from ghosting and reduced image density due to inadequate triboelectric charge management.
Innovation Solution
A core-shell structured external additive for toners, comprising tin oxide as the core and a shell coated with a silane-based compound and aluminum hydroxide, addresses these issues by providing an alternative to titanium dioxide and managing triboelectric charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If titanium dioxide is used as the main component of external additive for toner, then electronegativity and print quality are improved, but environmental compliance deteriorates due to carcinogen labeling requirements
Solution Approach 1:
The patent changes the chemical composition parameter by substituting titanium dioxide with tin oxide as the main component of the external additive. This parameter change maintains the desired electronegativity properties for print quality while eliminating the environmental compliance issues associated with titanium dioxide labeling requirements.
Solution Approach 2:
The patent employs a shell structure that can be easily applied and removed, representing a disposable approach to the external additive. The shell containing aluminum hydroxide and silane-based compound is applied to the toner surface and then removed after serving its protective and functional purpose, allowing easy replacement with new toner.
2Object-affected harmful factors
If alternative materials like silica, alumina, or iron oxide are used instead of titanium dioxide, then environmental compliance is improved, but triboelectric charge management deteriorates leading to ghosting
Solution Approach 1:
The patent changes the material composition parameter by using tin oxide instead of conventional alternatives like silica, alumina, or iron oxide. This specific material selection maintains the electronegativity parameter necessary for proper triboelectric charge management while achieving environmental compliance, thereby avoiding ghosting issues.
Solution Approach 2:
The patent creates a composite structure consisting of a tin oxide core surrounded by a shell containing aluminum hydroxide and silane-based compound. This composite material combines the beneficial electrical properties of tin oxide with the protective and functional properties of the shell components, achieving both environmental compliance and reliable triboelectric charge management.
3Reliability
If shell components are added to the external additive structure, then durability and functionality are improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the external additive into distinct segments: a core material (tin oxide) and a shell material (aluminum hydroxide with silane-based compound). This segmentation allows each component to be manufactured and optimized independently, then combined through a relatively simple coating process, thereby improving durability without excessively increasing manufacturing complexity.
Solution Approach 2:
The silane-based compound acts as an intermediary between the tin oxide core and the aluminum hydroxide shell, facilitating the formation of a stable composite structure. This intermediary component simplifies the manufacturing process by enabling effective bonding between different materials while maintaining the functional benefits of the multi-layer structure.
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 enhances environmental compliance, reduces ghosting, and increases image density, thereby improving print quality and durability.
Implementation Method 1
a shell in which a part or all of the core is coated with a silane-based compound and aluminum hydroxide
Implementation Method 2
containing aluminum hydroxide as another component to reduce triboelectric charge amount
Data Source
Figure 1
Figure 2
AI summary
A toner external additive composition of the present invention comprises, as a core component, tin oxide, to be usable as an alternative material for conventional titanium dioxide (TiO2), and thus can respond to future regulations on titanium dioxide and environment. In addition, the toner external additive composition and a toner composition comprising same comprise, as a shell component, a silane-based compound and aluminum hydroxide to reduce triboelectric charge so that a ghost phenomenon is alleviated and increase image density so that print quality is improved. Particularly, if aluminum hydroxide is used in a specific amount range, a print quality improvement effect can be further improved.