Ames Negative Sublimation Toner Dye Compositions
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Solution Overview
Problem
Existing sublimation toners often result in a positive Ames test, which can lead to toxicological and environmental concerns, particularly when designing cyan and black toners that require specific dye combinations for optimal transfer rate, hue, and light stability, as many disperse dyes used in these toners fail to meet the desired characteristics and safety standards.
Innovation Solution
The development of specific combinations and concentrations of disperse dyes, along with suitable polymer binders and charge control agents, to create toner compositions that are Ames test negative in both TA98 and TA100 strains, ensuring the toners meet the required toxicological and environmental safety standards while maintaining excellent color transfer and light stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If disperse dyes are used in sublimation toners to achieve optimal color transfer and light stability, then the toner performance is improved, but the Ames test result becomes positive indicating toxicological concerns
Solution Approach 1:
The patent modifies the chemical parameters of the disperse dyes by adjusting molecular structure, substituting specific chemical groups, or changing dye composition ratios to eliminate Ames test positivity while preserving color transfer and light stability properties
Solution Approach 2:
The patent creates composite dye formulations by combining multiple disperse dyes in specific ratios, where the composite achieves both optimal color performance and negative Ames test results, overcoming the limitations of individual dye components
2Manufacturing precision
If specific dye combinations are used to achieve optimal transfer rate and hue in cyan and black toners, then the color quality is improved, but the toxicological safety is compromised due to positive Ames test
Solution Approach 1:
The patent applies local quality by selectively modifying only the problematic dye components while maintaining the overall color formulation, achieving toxicological safety without sacrificing color quality or transfer rate performance
Solution Approach 2:
The patent introduces intermediary substances or modified dye structures that act as mediators between the color performance requirements and toxicological safety constraints, enabling both objectives to be satisfied simultaneously
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 proposed toner compositions achieve a negative Ames test, ensuring toxicological safety and environmental sustainability, while providing optimal color transfer and light stability, particularly in cyan and black toners, by carefully selecting and combining disperse dyes and using appropriate binder and charge control agents.
Implementation Method 1
Many solvent and disperse 'heat transfer' or 'sublimation' dyes can also be included in a toner formulation... This unique class of colorants is solid at room temperature but upon heating at elevated temperature they transition to a gaseous state and then upon cooling become solid again.
Data Source
AI summary
Provided are toners and combinations of toners that demonstrate excellent color and are Ames test negative in both Salmonella typhimurium strains TA98 and TAIOO.