Thermally-Responsive Record Material Using Non-Isocyanate Developers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Thermally-responsive record materials often rely on isocyanate compounds, which are environmentally unfriendly and hazardous, and lack effective alternatives for producing stable, non-reversible images resistant to fade or erasure.
Innovation Solution
A thermally-responsive record material system using 4,4'-diaminodiphenyl sulfone and/or 3,3'-diaminodiphenyl sulfone as non-phenolic developers in combination with leuco dyes and organic acids, eliminating the need for isocyanates and enhancing image intensity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If isocyanate compounds are used in thermally-responsive record materials, then image formation capability is achieved, but environmental safety and health hazards worsen
Solution Approach 1:
The patent removes isocyanate compounds from the thermally-responsive record material formulation, extracting the harmful substance while maintaining the core image formation functionality through alternative chemistry involving leuco dyes and phenolic developers
Solution Approach 2:
The invention changes the chemical parameters of the developer material from isocyanate-based to phenolic-based compounds, fundamentally altering the reaction mechanism while achieving comparable or superior image stability and environmental safety
2Reliability
If traditional phenolic developers are used, then image development is achieved, but image intensity and stability are insufficient
Solution Approach 1:
The patent employs composite formulations combining specific phenolic developers with leuco dyes and optional additives like sulfur compounds, creating a synergistic system that achieves both high image intensity and superior stability
Solution Approach 2:
The invention optimizes parameters including developer concentration, molecular structure of phenolic compounds, and reaction conditions to maximize image intensity while ensuring long-term stability and fade resistance
3Reliability
If reversible image systems are used, then ease of erasure is achieved, but image permanence and reliability worsen
Solution Approach 1:
The patent converts the typically harmful effect of permanent chemical bonding into a beneficial feature by designing a system where the phenolic-leuco dye reaction produces stable, non-reversible bonds that ensure image permanence, while the formulation still allows for controlled development
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 system produces high-intensity, non-reversible images that are resistant to fade and erasure, suitable for applications like barcodes, while being environmentally friendlier and safer than traditional isocyanate-based systems.
Implementation Method 1
basic colorless or lightly colored chromogenic material and acidic color developer material are contained in a coating on a substrate which, when heated to a suitable temperature, melts or softens to permit said materials to react, thereby producing a colored mark
Implementation Method 2
when heated to a suitable temperature, melts or softens to permit said materials to react
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention describes a thermally-responsive record material substantially free of aromatic isocyanate. The record material comprises a support having provided thereon a heat-sensitive composition comprising a substantially colorless dye precursor comprising a fluoran; and a developer material selected from the group consisting of 4,4'-diaminodiphenylsulfone and 3,3'-diaminodiphenylsulfone, which upon being heated react with said dye precursor to develop color, and including a binder material. Optionally, one or more of an organic acid, a modifier compound, or magnesium stearate is included in the heat-sensitive composition. The modifier compound can be selected from the a fatty acid amide, preferably a saturated fatty acid amide such as an alkyl amide, a bis methylene alkyl amide, or a bis ethylene alkyl amide.