Thermosensitive Recording Material Using Non-Phenolic Color Developing Agent
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Solution Overview
Problem
Existing thermosensitive recording materials face challenges in achieving high thermal responsiveness, water resistance of printed portions, and heat resistance of the background, while also being susceptible to plasticizer resistance issues.
Innovation Solution
A thermosensitive recording material utilizing a non-phenolic compound represented by a specific general formula as a color developing agent, which enhances the water resistance of printed portions and the heat resistance of the background.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If phenolic-based color developing agents (e.g., bisphenol A, bisphenol S) are used to achieve high color developing capability, then color intensity is improved, but thermal responsiveness deteriorates and water resistance of printed portions deteriorates
Solution Approach 1:
The invention changes the chemical structure parameters of the color developing agent by replacing phenolic hydroxy groups with carboxylic acid groups and their derivatives. This structural parameter change fundamentally alters the thermal properties, lowering the melting point from above 100°C to below 100°C, thereby improving thermal responsiveness while maintaining color developing capability through the carboxylic acid group's reactivity with leuco dyes
Solution Approach 2:
The invention uses a composite approach by combining specific non-phenolic compounds (with carboxylic acid groups) with leuco dyes and optional phenolic compounds in controlled ratios. This composite formulation achieves both high color intensity and improved thermal responsiveness, as well as enhanced water resistance, by leveraging the synergistic effects of different components
2Strength
If phenolic-based color developing agents are used to achieve high color developing capability, then color intensity is improved, but water resistance of printed portions deteriorates
Solution Approach 1:
The invention changes the chemical functional group parameter from phenolic hydroxy to carboxylic acid, which fundamentally alters the interaction with water. The carboxylic acid group forms stronger hydrogen bonds and exhibits different solubility characteristics, resulting in printed portions with excellent water resistance while maintaining high color developing capability through the acid-leuco dye reaction mechanism
3Reliability
If cross-linked diphenylsulfone compounds or urea urethane compounds are used to achieve high plasticizer resistance, then stability to plasticizer is improved, but thermal responsiveness deteriorates
Solution Approach 1:
The invention changes the molecular structure parameters by selecting non-phenolic compounds with carboxylic acid groups and controlled molecular weight, avoiding the high molecular weight and cross-linked structures of diphenylsulfone and urea urethane compounds. This parameter optimization maintains plasticizer resistance through molecular design while achieving low melting points for high thermal responsiveness
4Reliability
If urea urethane compounds are used in combination to improve stability, then overall stability is improved, but background fogging increases in high humidity environments
Solution Approach 1:
The invention changes the chemical composition parameters by replacing urea urethane compounds with non-phenolic compounds containing carboxylic acid groups. This compositional parameter change eliminates the background fogging issue in high humidity while maintaining overall stability through the chemical properties of the carboxylic acid-based color developing system
Solution Approach 2:
The invention converts the potential harm of humidity-sensitive urea urethane compounds into a benefit by using carboxylic acid-based compounds that are inherently more stable in humid conditions. The carboxylic acid group's chemical properties provide natural resistance to humidity-induced degradation, turning the humidity environment from a harmful factor into a non-issue
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 proposed solution provides printed portions with excellent coloring properties and water resistance, along with a background that exhibits superior heat resistance, effectively addressing the limitations of prior art.
Implementation Method 1
The thermosensitive recording material produces a color through a chemical reaction that occurs by melting one or both of the leuco dye and the color developing agent by heating to bring the leuco dye and the color developing agent into contact with each other
Implementation Method 2
a color developing agent, a stabilizer, and the like have been performed, but those that sufficiently balance color sensitivity, image stability, and the like have not been found yet. In general, a color developing compound having a phenolic hydroxy group has high color developing capability
Data Source
AI summary
A thermosensitive recording material including a compound represented by the following formula (1):wherein, R1 to R10 each independently represent a hydrogen atom, a halogen atom, a nitro group, an amino group, an alkyl group, an alkoxy group, an aryl oxy group, an alkyl carbonyl oxy group, an aryl carbonyl oxy group, an alkyl carbonyl amino group, an aryl carbonyl amino group, an alkyl sulfonyl amino group, an aryl sulfonyl amino group, a monoalkyl amino group, a dialkyl amino group, or an aryl amino group.