Toner Particle Acid Value and Metal Ion Control
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Solution Overview
Problem
Electrostatic charge image developing toners face image unevenness issues when forming high-density images in low-temperature and low-humidity environments, due to pigment aggregation and inadequate adhesiveness of external additives.
Innovation Solution
The toner particles contain a binder resin with an acid value of 5-25 mgKOH/g and a pigment with an isoindoline skeleton, where alkali metals and alkaline earth metals are electrostatically bonded to the binder resin, controlling their Net intensity to 1.50-4.00 kcps to enhance pigment dispersion and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a binder resin with acid value of 5-25 mgKOH/g and isoindoline skeleton pigment are used, then good color development and charging properties are achieved, but image unevenness occurs in low-temperature and low-humidity environments due to pigment aggregation and poor external additive adhesiveness
Solution Approach 1:
The patent controls the Net intensity of alkali metals and alkaline earth metals within a specific range (1.50-4.00 kcps) to optimize the chemical environment. This parameter control prevents pigment aggregation and maintains external additive adhesiveness in low-temperature and low-humidity conditions, resolving the image uniformity issue without sacrificing color development and charging properties
Solution Approach 2:
The patent creates a composite toner system combining binder resin with controlled acid value (5-25 mgKOH/g), isoindoline skeleton pigment, and regulated amounts of alkali metals and alkaline earth metals. This composite structure achieves synergistic effects where the controlled metal content stabilizes both pigment dispersion and external additive bonding, preventing image unevenness while maintaining excellent color development and charging properties
2Reliability
If external additives are applied to improve toner performance, then charging and transfer properties are enhanced, but they release and transfer to the recording medium causing image unevenness in high-density repeated imaging
Solution Approach 1:
The patent regulates the Net intensity of alkali metals and alkaline earth metals (1.50-4.00 kcps) to create an optimal chemical environment that strengthens external additive bonding. This parameter control prevents additive release during high-density repeated imaging, eliminating image unevenness while preserving the charging and transfer enhancement benefits of the external additives
3Reliability
If pigment concentration is increased for high-density imaging, then image density is improved, but pigment aggregation occurs causing image unevenness in repeated imaging cycles
Solution Approach 1:
The patent controls the Net intensity of alkali metals and alkaline earth metals within 1.50-4.00 kcps to create a stable chemical environment that prevents pigment aggregation. This allows high pigment concentration to be maintained for high-density imaging while ensuring uniform dispersion and consistent image quality across repeated imaging cycles
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
This configuration suppresses pigment aggregation, improves dispersibility, and reduces image unevenness by maintaining the adhesiveness of external additives, preventing their release and transfer to the recording medium.
Implementation Method 1
alkali metals and alkaline earth metals are electrostatically bonded to the binder resin
Data Source
AI summary
An electrostatic charge image developing toner includes a toner particle that contains a binder resin having an acid value of 5 mgKOH/g or more and 25 mgKOH/g or less, and a pigment having an isoindoline skeleton, in which a total Net intensity NA of an alkali metal and an alkaline earth metal, which is measured by fluorescent X-ray analysis, in the toner particle is 1.50 kcps or more and 4.00 kcps or less.