Toner Formulation with Nonionic Surfactant and Tin Oxide
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional toners for electrostatic image development are prone to color streaks, especially when used in high-temperature high-humidity environments for printing low-area coverage images, due to uneven distribution and charging of toner components.
Innovation Solution
A toner formulation containing nonionic surfactant and tin oxide particles, with the nonionic surfactant content between 0.05% to 1% by mass and tin oxide particles as the external additive, which helps in maintaining surface dispersibility and reducing charge differences among toner components, preventing color streaks by ensuring even supply to the image holding member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional toners are used in high-temperature high-humidity environments for continuous printing of low-area coverage images, then productivity is maintained, but color streaks occur due to uneven distribution and charging of toner components
Solution Approach 1:
The patent changes the chemical composition parameters of the toner by incorporating a nonionic surfactant (specifically polyethylene glycol distearate) at a controlled concentration (0.01-5% by mass) and using tin oxide particles with specific surface treatment. This parameter modification resolves the charging unevenness that causes color streaks while maintaining toner performance in high-temperature high-humidity continuous printing conditions
Solution Approach 2:
The nonionic surfactant acts as an intermediary substance between the toner base particles and the external additive (tin oxide particles). It mediates the interaction by improving surface dispersibility and reducing charge differences among toner components, preventing the harmful effect of color streaks while maintaining uniform toner supply to the image holding member
2Reliability
If nonionic surfactant content is increased to improve surface dispersibility, then color streak prevention improves, but toner composition complexity increases
Solution Approach 1:
The patent optimizes the surfactant concentration parameter to a specific range (0.01-5% by mass, preferably 0.1-2%) to achieve effective color streak prevention without excessive complexity. This parameter optimization ensures sufficient surface dispersibility improvement while maintaining practical toner formulation simplicity and manufacturability
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 effectively prevents color streaks at the one widthwise end portion of the image holding member even in high-temperature high-humidity conditions during continuous printing of low-area coverage images, improving image quality and reliability.
Implementation Method 1
a nonionic surfactant, a binder resin, and a release agent; and an external additive, wherein a content of the nonionic surfactant is from 0.05% by mass to 1% by mass inclusive based on a total mass of the toner
Implementation Method 2
the external additive contains tin oxide particles
Data Source
AI summary
A toner for electrostatic image development contains: toner base particles containing at least a nonionic surfactant, a binder resin, and a release agent; and an external additive. The content of the nonionic surfactant is from 0.05% by mass to 1% by mass inclusive based on the total mass of the toner, and the external additive contains tin oxide particles.