Phenol-Free Color Developer for Heat-Sensitive Recording Material
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Solution Overview
Problem
Existing heat-sensitive recording materials with non-phenolic color developers, such as sulfonylureas, face challenges in chemical stability, especially in the presence of water, leading to decomposition over a wide pH range, and are costly to produce due to complex synthesis and high raw material requirements, affecting their durability and economic viability.
Innovation Solution
A heat-sensitive recording material comprising a carrier substrate with a heat-sensitive color-forming layer containing a phenol-free color developer of the formula (I), where Ar is an aryl or benzyl radical, and a color former of triphenylmethane, fluoran, azaphthalide, or fluorene type, allowing for cost-effective production through one-step synthesis and maintaining performance properties like thermal responsiveness and surface whiteness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-phenolic color developers (sulfonylureas) are used to improve image durability and resistance to hydrophobic substances, then the printed image stability is improved, but the chemical stability of the unprinted material deteriorates due to decomposition in the presence of water
Solution Approach 1:
The patent changes the chemical structure parameters of the color developer by introducing specific molecular groups (aryl, benzyl, aryloxy, benzyloxy, arylamino, or benzylamino radicals) attached to the sulfonylurea core. This structural modification alters the chemical stability properties, allowing the developer to maintain both printed image stability and resistance to hydrophobic substances while improving chemical stability in the unprinted state by reducing decomposition in the presence of water.
2Reliability
If complex multi-step synthesis is used to produce non-phenolic color developers, then the performance characteristics (image stability, resistance to hydrophobic substances) are improved, but the production cost and manufacturing complexity increase
Solution Approach 1:
The patent segments the color developer molecule into distinct functional components: a sulfonylurea core structure and detachable aromatic substituents (aryl, benzyl, aryloxy, benzyloxy, arylamino, or benzylamino radicals). This segmentation allows for simplified synthesis by assembling these modular components through one-step reactions, reducing the complexity of the overall synthesis process while maintaining the performance characteristics of image stability and resistance to hydrophobic substances.
3Object-affected harmful factors
If phenol-free color developers are used to avoid toxic (bis)phenolic chemicals, then the safety and durability are improved, but the production cost increases due to complex synthesis and expensive raw materials
Solution Approach 1:
The patent employs cost-effective raw materials and simplifies the synthesis process to one-step reactions, making the production of phenol-free color developers economically viable. By using readily available aromatic compounds and eliminating the need for complex multi-step synthesis, the production cost is reduced while maintaining the safety advantage of avoiding toxic (bis)phenolic chemicals. The simplified process makes the phenol-free developer economically competitive with traditional phenolic 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 balanced application-related properties, including high image stability under harsh conditions, resistance to hydrophobic agents, and economic efficiency, with improved durability and stability of both unprinted and printed images, even after long-term storage and exposure to environmental factors.
Implementation Method 1
The heat-sensitive color-forming layer typically contains a color former and a color developer, which react with each other under the influence of heat, resulting in color development
Data Source
AI summary
The invention relates to a heat-sensitive recording material, comprising a supporting substrate and a heat-sensitive color-forming layer, which contains at least one color former and at least one phenol-free color developer, characterized in that the at least one color developer is a compound of formula (I), wherein Ar is an aryl residue, a heteroaryl residue, or a benyzl residue and Y is an aryl residue, a heteroaryl residue, a benzyl residue, an aryloxy residue, a heteroaryloxy residue, a benzyloxy residue, an arylamino residue, a heteroarylamino residue, or a benzylamino residue. The invention further relates to a method for producing said heat-sensitive recording material.