Toner External Additive Composition for Adhesion Control
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Solution Overview
Problem
Conventional fatty acid metal salts are ineffective in preventing toner adhesion to the toner carrying member, leading to issues like image fog, halftone image non-uniformity, and contamination of the charging member, especially in high-speed color image forming machines.
Innovation Solution
A toner comprising toner base particles with a binder resin and colorant, and an external additive of a fatty acid metal salt composition containing a nonionic surface-active agent, which improves releasability and charge stability, reducing adhesion and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional fatty acid metal salts are used as external additives, then the toner can be produced with basic properties, but the toner adheres to the toner carrying member causing image fog and halftone non-uniformity
Solution Approach 1:
The invention changes the chemical composition parameters of the external additive by using a fatty acid metal salt composition containing specific components (fatty acid metal salt, silicone oil, and wax) in controlled ratios, rather than using conventional single-component fatty acid metal salts. This compositional parameter change prevents toner adhesion while maintaining manufacturability
Solution Approach 2:
The invention employs a composite external additive material consisting of fatty acid metal salt in combination with silicone oil and wax components. This composite structure provides synergistic effects that prevent toner adhesion to the carrying member, eliminate image fog, and ensure uniform halftone reproduction, while the individual components maintain compatibility with standard toner production processes
2Use of energy by stationary object
If the toner is made fixable at lower temperature, then energy consumption is reduced, but the toner shows poor durability to mechanical stress
Solution Approach 1:
The invention modifies the toner's thermal and mechanical properties by incorporating specific binder resin compositions and external additives that decouple the relationship between fixing temperature and mechanical strength. The toner can be formulated to fix at lower temperatures while maintaining durability through controlled particle structure and surface properties
3Productivity
If high-speed printing is implemented, then productivity increases, but heat is generated at shafts and rubbing portions causing toner durability issues
Solution Approach 1:
The invention introduces external additives as intermediary substances that reduce friction and heat generation between moving parts during high-speed printing. These additives act as lubricants at the interface between toner and mechanical components, allowing high-speed operation without excessive heat buildup that would compromise toner durability
4Quantity of substance
If fine-powder component accumulates on toner carrying member surface, then particle size distribution changes, but toner transport becomes faulty due to surface contamination
Solution Approach 1:
The invention converts the potentially harmful fine powder accumulation into a beneficial effect by using the fine powder as a lubricating layer that prevents excessive adhesion. The fatty acid metal salt composition ensures that accumulated fine powder on the carrying member surface reduces friction and prevents faulty toner transport, turning what was previously a problem into an advantage
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 maintains stable particle size and chargeability, preventing adhesion to the toner carrying member and reducing image defects like fog and halftone non-uniformity, while minimizing contamination of the charging member.
Implementation Method 1
a fatty acid metal salt composition containing a nonionic surface-active agent and a fatty acid metal salt
Implementation Method 2
the toner is electrostatically charged by rubbing friction between a toner carrying member and a toner layer thickness control member
Data Source
AI summary
A toner which has i) toner base particles containing at least a binder resin and a colorant and ii) a fatty acid metal salt composition as an external additive. The fatty acid metal salt composition contains a nonionic surface-active agent and a fatty acid metal salt. This toner and an image forming process making use of the toner can keep the toner from adhering to a toner carrying member throughout running, promise a stable chargeability of the toner and can keep any deterioration of halftone image quality from being caused by excess charging of the toner and any image fog from being caused by insufficient charging of the toner.