Phenol-Free Sulfonylurea Color Developer for Heat-Sensitive Recording
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Solution Overview
Problem
Heat-sensitive recording materials using non-phenolic colour developers face challenges in maintaining print density and stability, especially when exposed to hydrophobic substances and extreme storage conditions, due to hydrolytic decomposition and limited hydrogen bridge acceptor properties.
Innovation Solution
A heat-sensitive recording material is developed using a phenol-free colour developer with a specific sulfonylurea structure, Ar1—NH—CO—NH—C6H4—SO2—O—C6H4—NH—CO—NH—Ar2, which provides excellent resistance to hydrophobic substances and long-term storage stability without the need for special formulation components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-phenolic colour developers are used, then resistance to hydrophobic substances and long-term storage stability are improved, but print density and writing performance deteriorate due to hydrolytic decomposition
Solution Approach 1:
The invention modifies the molecular structure of non-phenolic colour developers by introducing specific structural features (Y and Z groups in the general formula) that alter their chemical properties. These parameter changes reduce hydrolytic decomposition while maintaining colour development capability, thus resolving the contradiction between storage stability and print density
Solution Approach 2:
The patent develops composite colour developer systems combining multiple non-phenolic colour developers with specific structural characteristics. This composite approach synergistically improves both storage stability and print density, overcoming the limitations of individual non-phenolic colour developers
2Object-affected harmful factors
If non-phenolic colour developers with limited hydrogen bridge acceptor properties are used, then toxicity concerns are reduced, but image resistance under harsh environmental conditions deteriorates
Solution Approach 1:
The invention enhances the hydrogen bridge acceptor properties of non-phenolic colour developers by introducing specific functional groups and structural features. This parameter modification increases image resistance to hydrophobic substances and environmental factors while maintaining the non-toxic nature of phenol-free developers
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 achieves high print density and stability, maintaining image quality even after storage under harsh conditions, with minimal loss of writing performance, and shows improved resistance to hydrophobic substances and environmental factors.
Implementation Method 1
The heat-sensitive colour-forming layer usually contains a colour former and a colour developer, which react with each other under the influence of heat and thus lead to colour development
Implementation Method 2
Sulfonylureas tend towards hydrolytic decomposition reactions in the presence of water/moisture and in heat
Data Source
AI summary
Described are colour developers of formula (I)Ar1—NH—CO—NH—C6H4—SO2—O—C6H4—NH—CO—NH—Ar2 (I),a heat-sensitive recording material comprising a carrier substrate and also a heat-sensitive, colour-forming layer containing at least one colour former and at least one phenol-free colour developer, wherein the at least one colour developer is the compound of formula (I), and a method for producing this heat-sensitive recording material.