Thermally-Responsive Record Material Using Non-Phenolic Developers
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Solution Overview
Problem
Thermally-responsive record materials that are environmentally friendly and do not use hazardous isocyanate compounds are needed to address safety and market acceptance concerns in commercial applications.
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 a leuco dye and an organic acid, which reacts to form a color image without aromatic isocyanates, and optionally includes fillers and modifiers like magnesium stearate to enhance image intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If isocyanate compounds are used as developer material in thermally-responsive record materials, then color image formation is achieved, but environmental safety and commercial acceptability deteriorate due to hazardous properties
Solution Approach 1:
The invention extracts and removes the harmful isocyanate component from the thermal recording system while retaining the essential color formation function through alternative chemistries using non-phenolic developers and organic acids
Solution Approach 2:
The invention changes the chemical parameters of the developer material from isocyanate-based to non-phenolic developer-based systems, fundamentally altering the chemical reaction mechanism to eliminate harmful substances while maintaining imaging functionality
2Illumination intensity
If conventional phenolic developers are used in thermally-responsive record materials, then color development is achieved, but image intensity and environmental acceptability are limited
Solution Approach 1:
The invention changes the chemical composition parameters by substituting phenolic developers with non-phenolic developers (4,4'-diaminodiphenyl sulfone and 3,3'-diaminodiphenyl sulfone), which enable enhanced image intensity while improving environmental acceptability
Solution Approach 2:
The invention creates a composite chemical system combining non-phenolic developers with specific organic acids and leuco dyes, where the synergistic interaction produces superior image intensity compared to conventional phenolic systems
3Illumination intensity
If organic acid and non-phenolic developer are combined in thermally-responsive record materials, then image intensity is enhanced, but formulation complexity increases
Solution Approach 1:
The invention merges the organic acid and non-phenolic developer into a single integrated coating layer with the leuco dye, simplifying the overall structure despite the enhanced chemical functionality, thereby managing formulation complexity
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 a high-intensity, non-reversible image that is resistant to fading and erasure, suitable for barcodes and other applications, with improved environmental safety and commercial viability by eliminating isocyanates and enhancing image intensity with organic acids and fillers.
Implementation Method 1
a leuco dye and an organic acid which upon being heated reacts to form a color image
Implementation Method 2
when heated to a suitable temperature, melts or softens to permit said materials to react
Data Source
AI summary
The invention describes an improved thermally-responsive record material substantially free of aromatic isocyanate yielding an image of high intensity and useful for bar codes. The record material comprises a support having provided thereon a heat-sensitive composition comprising a substantially colorless color former comprising a fluoran; and a developer material selected from the group consisting of 4,4′-diaminodiphenylsulfone and 3,3′-diaminodiphenylsulfone, and an organic acid which upon being heated reacts with said color former to develop color, and including a binder material. Optionally, a modifier compound is included in the heat-sensitive composition. The compound can be selected from the group consisting of a fatty acid amide, such as stearmide. Optionally, magnesium state is included.