Phenol-Free Color Developer Mixtures for Heat-Sensitive Print Durability
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Solution Overview
Problem
Existing heat-sensitive recording materials lack sufficient resistance to environmental factors such as humidity, heat, chemicals, greases, and oils, leading to degradation of printed images, especially in applications like tickets and receipts that are exposed to various conditions.
Innovation Solution
A heat-sensitive recording material comprising a carrier substrate and a heat-sensitive recording layer with a color former and a phenol-free organic color developer, specifically a compound of formula I, optionally covered by a protective layer, and a combination of crosslinked or noncrosslinked binders and crosslinking agents to enhance resistance and printability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phenolic color developers are used to improve print resistance, then resistance to water and plasticizers is improved, but environmental concerns and health risks increase
Solution Approach 1:
The patent removes phenolic components (specifically bisphenol-A and bisphenol-S) from the color developer formulation while maintaining the essential color-forming functionality through alternative organic compounds, thereby eliminating harmful substances while preserving print resistance
Solution Approach 2:
The patent changes the chemical composition parameters by substituting phenolic compounds with non-phenolic organic color developers having specific molecular structures and properties, achieving both reduced environmental impact and maintained performance
2Object-affected harmful factors
If phenol-free organic color developers are used to reduce environmental impact, then ecological friendliness is improved, but resistance to greases and oils deteriorates
Solution Approach 1:
The patent creates a composite color developer system combining multiple non-phenolic organic compounds with complementary properties, where the synergistic interaction between components provides both environmental safety and enhanced resistance to greases and oils
Solution Approach 2:
The patent introduces specific organic compounds as intermediaries that bridge the gap between environmental safety and performance requirements, mediating between the need for eco-friendliness and the need for print durability against greases and oils
3Manufacturing precision
If conventional color developers are used to achieve good print quality, then color formation is improved, but resistance to heat and humidity deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the color developer by selecting compounds with specific thermal stability and humidity resistance properties while maintaining their color-forming capabilities, achieving simultaneous improvement in both quality and durability
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 material exhibits improved resistance to humidity, heat, greases, and oils, maintaining print durability and legibility under adverse conditions, with enhanced printability and reduced environmental impact.
Implementation Method 1
dye precursors with which the color developers react on supply of heat to form a visually perceptible color
Implementation Method 2
improving the resistance of the printed image of a heat-sensitive recording material with respect to water, aqueous alcohol solutions, and plasticizers
Data Source
AI summary
A description is given of a heat-sensitive recording material, comprising phenol-free organic color developers, more particularly comprising a color developer mixture comprising phenol-free organic color developers, of a heat-sensitive recording layer and also of a coating composition for producing it, of the use of the heat-sensitive recording material, of the use of an organic color developer of a formula I for improving the resistance of the printed image of a heat-sensitive recording material, and of a method for producing heat-sensitive recording material.