Toner Composition with Ionic Resin for Fogging Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing toners face challenges in suppressing image fogging across a broad back contrast range, especially under varying temperature and humidity conditions, leading to reduced image quality and increased toner consumption.
Innovation Solution
A toner composition incorporating a binder resin, a fatty acid metal salt with a polyvalent metal of valency 2 or higher, and a resin with an ionic functional group having a specific acid dissociation constant pKa range, which stabilizes charge distribution and improves pigment dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If potential control devices are used to suppress fogging, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent employs a toner formulation with charge control agents that provides fogging suppression without requiring complex potential control devices. The toner particles themselves contain the necessary charge control mechanisms, effectively making the toner a self-contained solution that eliminates the need for additional complex equipment.
Solution Approach 2:
The patent changes the chemical parameters of the toner by incorporating specific charge control agents and resin combinations. This alters the charge characteristics of the toner particles, enabling fogging suppression through material composition rather than complex device control mechanisms.
2Manufacturing precision
If toner charge quantity is increased to prevent reverse polarity particles, then fogging is reduced, but image density and tinting strength may be compromised
Solution Approach 1:
The patent optimizes the charge quantity parameter of toner particles by incorporating charge control agents. This creates a balanced charge distribution that prevents reverse polarity particles while maintaining appropriate image density and tinting strength, achieving fogging suppression without excessive toner consumption.
Solution Approach 2:
The patent uses composite toner particles containing multiple components including binder resin, charge control agents, and pigment. This composite structure allows the toner to achieve both sufficient charge for fogging prevention and appropriate optical properties for image quality.
3Quantity of substance
If existing charge control agents are used, then charge quantity is improved, but rising performance of charge quantity deteriorates under high temperature and humidity conditions
Solution Approach 1:
The patent employs a composite charge control system combining multiple agents: a calixarene compound (first charge control agent) and an organoboron compound (second charge control agent). This composite approach provides both sufficient charge quantity and stable rising performance under high temperature and humidity conditions, overcoming the limitations of single-agent systems.
Solution Approach 2:
The patent introduces specific chemical compounds as intermediaries that mediate the charging process. The calixarene and organoboron compounds act as intermediaries between the toner particles and the charging mechanism, providing stable charge control across varying environmental conditions.
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 suppresses fogging across a wide back contrast range, maintaining image quality and reducing toner consumption, even under extreme environmental conditions, through sustained use.
Implementation Method 1
a resin having an ionic functional group which has an acid dissociation constant pKa of at least 6.0 and not more than 9.0
Implementation Method 2
a fatty acid metal salt of a polyvalent metal with valency of 2 or higher and a fatty acid with carbon atom number of at least 8 and not more than 28
Data Source
AI summary
A toner having a toner particle which contains a binder resin, a fatty acid metal salt, and a resin having an ionic functional group, in which the fatty acid metal salt is a fatty acid metal salt of a polyvalent metal with valency of 2 or higher and a fatty acid with carbon atom number of at least 8 and not more than 28, and the acid dissociation constant pKa of the resin having an ionic functional group is at least 6.0 and not more than 9.0.