Thermosensitive Recording Medium Color Developing Agent Ratio
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Solution Overview
Problem
Thermosensitive recording media face challenges in maintaining image and blank portion preservation under severe environments, particularly high temperatures and humidity, leading to inadequate bar code readability due to deteriorated color developing sensitivity and heat resistance issues.
Innovation Solution
Incorporating a specific ratio of 4-hydroxy-4'-benzyloxy diphenyl sulfone and urea-urethane-based compounds as electron accepting color developing agents in the thermosensitive recording layer, enhancing the chemical reaction efficiency and heat resistance of the blank portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is installed on the thermosensitive recording layer, then the preservation property of the image portion is improved, but the color developing sensitivity and bar code readability are deteriorated
Solution Approach 1:
The invention changes the chemical composition parameters of the color developing agent by using a specific mixture ratio of phenolic compound (60-90 mass%) and naphtholic compound (10-40 mass%). This parameter optimization allows the recording layer to achieve both good preservation properties and high color developing sensitivity without requiring a protective layer that would interfere with thermal energy transmission.
2Manufacturing precision
If the color developing sensitivity is deteriorated, then the density difference between recorded portion and blank portion becomes smaller, but the bar code readability is worsened
Solution Approach 1:
The invention uses a composite color developing agent system combining phenolic compound and naphtholic compound in specific proportions. This composite material approach creates synergistic effects where the phenolic compound provides baseline color development while the naphtholic compound enhances sensitivity and contrast, ensuring bar code readability is maintained even under severe environmental conditions.
3Adaptability or versatility
If thermosensitive recording media are used under severe environment such as high temperature condition, then the application scope is expanded, but the preservation property of image portion and blank portion becomes insufficient
Solution Approach 1:
The invention optimizes the chemical composition parameters of both the color developing agent (phenolic+naphtholic compound ratio) and the leuco dye structure to enhance thermal stability. This parameter optimization allows the recording medium to maintain image and blank portion preservation even under severe high temperature conditions, expanding its applicability to environments like car interiors in mid-summer.
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 solution results in excellent color developing properties and bar code readability even under severe conditions, with improved heat resistance and minimal background coloration of the blank portion.
Implementation Method 1
Thermosensitive recording medium develops color through an instantaneous chemical reaction when heated by a thermal head, hot stamp, hot pen, laser light or the like to yield a recorded image
Data Source
AI summary
The objective of the present invention is to provide a thermosensitive recording medium excellent in color developing property, especially excellent in bar code readability, under severe environment. Provided is a thermosensitive recording medium having a thermosensitive recording layer comprising a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent on a substrate, wherein the thermosensitive recording layer contains a specific sulfone compound and a specific urea-urethane-based compound in a specific ratio.