Heat-Sensitive Recording Layer Using Non-Phenol Stabilizers
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Solution Overview
Problem
Conventional heat-sensitive recording media using phenol-based compounds as developers and light stabilizers pose safety concerns as endocrine disrupting chemicals, and lack adequate chromogenic, light resistance, and heat resistance.
Innovation Solution
A heat-sensitive recording medium with a non-phenol-based developer and non-phenol-based light stabilizer, specifically a hindered amine-based light stabilizer, is developed to enhance chromogenic properties, light resistance, and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phenol-based compounds are used as developers and light stabilizers, then chromogenic properties and light resistance are improved, but safety concerns arise due to endocrine disrupting chemicals
Solution Approach 1:
The patent changes the chemical structure parameters of the developer and light stabilizer by replacing phenol-based compounds with non-phenol-based compounds (specifically compounds with sulfone groups and hindered amine light stabilizers). This structural parameter change eliminates the endocrine disrupting chemical concerns while maintaining or improving the functional performance in terms of chromogenic properties and light resistance.
2Reliability
If phenol-based compounds are used as developers and light stabilizers, then light resistance is improved, but heat resistance is insufficient causing non-print portions to develop color during microwave heating
Solution Approach 1:
The patent employs a composite formulation combining non-phenol-based developers (such as 4-hydroxy-4'-isopropoxydiphenylsulfone) with hindered amine light stabilizers (such as 2-(3'-t-butyl-2'-hydroxy-5'-methylphenyl)-5-chlorobenzotriazole). This composite material approach creates synergistic effects where the non-phenol-based developer provides good light resistance and the hindered amine light stabilizer enhances heat resistance, preventing color development in non-print portions during microwave heating while maintaining light resistance.
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 medium achieves excellent chromogenic properties, light resistance, and heat resistance without safety concerns from endocrine disrupting chemicals, with improved print quality and stability.
Implementation Method 1
a heat-sensitive recording layer containing a colorless or light-colored electron-donating leuco dye and an electron-accepting developer is provided on a support, wherein the heat-sensitive recording layer develops a color through a chemical reaction upon heating
Implementation Method 2
a non-phenol-based light stabilizer which comprises a hindered amine-based light stabilizer... ensures that a heat-sensitive recording medium is unlikely to turn yellow when the heat-sensitive recording medium is exposed for a long time to intense light including an ultraviolet ray
Data Source
AI summary
The purpose of the present invention is to provide a heat-sensitive recording medium which hardly causes safety concerns such as endocrine disrupting chemicals, and is excellent in chromogenic properties and light resistance, and also excellent in heat resistance. A heat-sensitive recording medium (1) has a configuration in which a heat-sensitive recording layer (3) is layered on a substrate (2). The heat-sensitive recording layer (3) comprises a color former, a non-phenol-based developer, and a non-phenol-based light stabilizer. The non-phenol-based light stabilizer comprises a hindered amine-based light stabilizer. Preferably, the non-phenol-based developer comprises a compound represented by the following formula (1) and/or a compound represented by the following formula (2).(The symbols in the formulae (1) and (2) are as defined in the specification.)