Electrostatic Toner Surface Composition for Charge Stability
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Solution Overview
Problem
Conventional electrostatic image developing toners face challenges in maintaining stable triboelectric charge and positive charging characteristics due to variations in environmental conditions like temperature and humidity, leading to issues with latent image reproducibility and aging stability.
Innovation Solution
The development of an electrostatic image developing toner with a specific composition that includes a binder resin and colorant, where the ratio of carboxyl groups and their salts on the surface to the total toner satisfies 0.02≦CA/CB≦0.20, and the ratio of nitrogen to sulfur elements on the surface is within 1≦Nt/St≦15, ensuring stable positive charging and reduced environmental sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional toners are used, then basic developing function is achieved, but triboelectric charge stability deteriorates under varying environmental conditions
Solution Approach 1:
The invention changes the chemical composition parameters of the toner by controlling the carboxyl group ratio (CA/CB between 0.02-0.20) and nitrogen-to-sulfur element ratio (Nt/St between 1-15) on the toner surface. These parameter adjustments optimize the triboelectric charge characteristics to remain stable across varying environmental conditions of temperature and humidity.
Solution Approach 2:
The invention uses a composite material approach by combining binder resin with colorant in specific ratios, where the colorant contains controlled amounts of carboxyl groups, nitrogen elements, and sulfur elements. This composite structure creates synergistic effects that stabilize triboelectric charge while maintaining developing performance across different environments.
2Reliability
If conventional toner composition is used, then manufacturing simplicity is maintained, but latent image reproducibility deteriorates
Solution Approach 1:
The invention specifies precise parameter ranges for carboxyl group ratio (CA/CB: 0.02-0.20) and nitrogen-to-sulfur element ratio (Nt/St: 1-15) to optimize latent image reproducibility. These parameter controls ensure consistent charging characteristics that accurately reproduce latent images while maintaining reasonable manufacturing complexity.
3Reliability
If conventional toner composition is used, then production cost is kept low, but aging stability deteriorates
Solution Approach 1:
The invention establishes specific parameter ranges for carboxyl group ratio (CA/CB: 0.02-0.20) and nitrogen-to-sulfur element ratio (Nt/St: 1-15) that enhance aging stability. These parameter specifications ensure the toner maintains its charging characteristics over time and through storage, improving aging stability while keeping composition control requirements manageable.
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 toner composition enhances latent image reproducibility and aging stability while maintaining positive electrostatic charge, even under varying environmental conditions, by controlling the surface and internal distribution of functional groups and elements, thereby improving the toner's performance and reliability.
Implementation Method 1
maintaining positive electrostatic charge, even under varying environmental conditions, by controlling the surface and internal distribution of functional groups and elements
Data Source
AI summary
An electrostatic image developing toner including a binder resin; and a colorant, and satisfying following conditions (1) and (2):0.02≦CA/CB≦0.20 (1)1≦Nt/St≦15 (2)wherein CA represents an amount of a carboxyl group and its salt on a surface of the toner, CB represents an amount of a carboxyl group and its salt in the entire toner, Nt represents an amount of a nitrogen element on the surface of the toner, and St represents an amount of a sulfur element on the surface of the toner.