Thermosensitive Recording Medium for High-Temperature Fogging Resistance
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Solution Overview
Problem
Existing heat-sensitive recording materials face challenges with poor long-term preservation of printing, insufficient thermal background fogging resistance, and plasticizer resistance, particularly at higher temperatures beyond 90°C.
Innovation Solution
A heat-sensitive recording material is developed comprising an undercoat layer with hollow particles and a binder, and a heat-sensitive recording layer containing a specific developer and a leuco dye, utilizing a compound represented by formula (1) and an inorganic pigment with limited oil absorption, enhancing thermal insulation and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-phenolic developer such as 3-[(phenylcarbamoyl)amino]phenyl-4-methylbenzenesulfonate is used, then water resistance and thermal background fogging resistance at 90°C are improved, but long-term preservation of printing deteriorates
Solution Approach 1:
The patent combines two different developers: 3-[(phenylcarbamoyl)amino]phenyl-4-methylbenzenesulfonate (which provides water resistance and thermal stability) and a urea urethane compound (which provides long-term preservation). This combination allows the recording material to simultaneously achieve excellent water resistance, thermal background fogging resistance at 90°C, and long-term preservation of printing.
2Ease of manufacture
If phenolic hydroxyl group-containing developers are used, then color development is achieved, but thermal response and water resistance deteriorate
Solution Approach 1:
The patent removes phenolic hydroxyl groups from the developer structure and replaces them with non-phenolic alternatives. Specifically, it uses 3-[(phenylcarbamoyl)amino]phenyl-4-methylbenzenesulfonate and urea urethane compounds that do not contain phenolic hydroxyl groups, thereby eliminating the poor thermal response and water resistance issues associated with phenolic developers while maintaining color development capability.
3Ease of manufacture
If conventional developers are used, then printing is formed, but thermal background fogging resistance at temperatures above 90°C is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the developer system by introducing a urea urethane compound with specific molecular structure and properties. This new developer component has superior thermal stability that prevents background fogging at temperatures above 90°C while still enabling effective printing formation, thus resolving the contradiction between printing capability and high-temperature thermal stability.
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 excellent long-term preservation of printing, high sensitivity, and improved thermal background fogging and plasticizer resistance, even at elevated temperatures.
Implementation Method 1
record color images by taking advantage of a heat-induced color development reaction between a colorless or pale-colored leuco dye and a phenol or an organic acid
Implementation Method 2
the undercoat layer containing hollow particles and a binder
Implementation Method 3
a pigment with an oil absorption of 130 ml/100 g or less as an inorganic pigment II
Data Source
AI summary
A heat-sensitive recording material including at least an undercoat layer and a heat-sensitive recording layer in this order on a support, the undercoat layer containing hollow particles and a binder, the heat-sensitive recording layer containing a leuco dye and a developer, the heat-sensitive recording material containing a compound represented by the following formula (1) as a first developer of the heat-sensitive recording layer: