Phenolsulfonic Acid Aryl Ester Developer for Thermal Recording
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Solution Overview
Problem
Current thermal recording materials face challenges in achieving a balance between high color-developing sensitivity with low energy, while maintaining image stability and minimizing background fog and heat resistance, as existing developers either lack sensitivity or suffer from inferior stability and fog issues.
Innovation Solution
A phenolsulfonic acid aryl ester with a specific structure is used as a developer, which includes a compound represented by the formula (1), enhancing color-developing sensitivity with low energy consumption and improving image stability and background fog resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a developer showing high color-developing sensitivity with low energy is used, then color-developing sensitivity is improved, but background fog increases and image stability deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the developer compound. Specifically, it introduces a phenolsulfonic acid aryl ester structure with particular substituents (R1-R6 groups) that alter the molecular properties to achieve both low-energy color development and high image stability. The structural parameters including aromatic rings, hydroxyl groups, and ester groups are optimized to balance sensitivity and stability.
Solution Approach 2:
The invention uses a composite molecular structure combining phenolsulfonic acid and aryl ester components. This composite structure integrates the electron-donating capability of phenolic groups with the stability of aryl ester moieties, creating a developer that simultaneously achieves high color-developing sensitivity and excellent image stability including heat resistance and plasticizer resistance.
2Reliability
If the molecular weight of the developer is increased to improve background fog and image stability, then image stability is improved, but color-developing sensitivity with low energy decreases
Solution Approach 1:
The patent optimizes molecular weight parameters within a specific range (50-300 Da) to balance both requirements. The phenolsulfonic acid aryl ester structure achieves this optimal molecular weight range, providing sufficient stability while maintaining low-energy color development capability. The molecular weight is controlled by selecting appropriate substituents and aromatic ring configurations.
3Use of energy by moving object
If existing developers like benzyl p-hydroxybenzoate or bisphenol A are used to achieve high sensitivity, then color-developing sensitivity is improved, but image stability and heat resistance become insufficient
Solution Approach 1:
The invention creates a composite molecular structure that integrates the reactive phenolic groups needed for high color-developing sensitivity with thermally stable aryl ester and aromatic ring systems. This composite structure provides both high sensitivity and excellent heat resistance, overcoming the limitations of simpler developers like benzyl p-hydroxybenzoate and bisphenol A.
Solution Approach 2:
The patent applies local quality by positioning specific functional groups (hydroxyl, ester, aromatic rings) at strategic locations within the molecule. The phenolic hydroxyl groups provide high reactivity for color development, while the aryl ester and aromatic ring systems provide thermal stability and resistance to plasticizers, creating localized functional zones within the same molecule.
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 phenolsulfonic acid aryl ester developer achieves a superior balance of color-developing sensitivity, image stability, and reduced background fog, even with low energy input, thereby improving thermal recording material performance.
Implementation Method 1
a thermal recording layer based mainly on a colorless or pale-colored basic (electron-donating) leuco dye and an electron-accepting developer that develops color by reacting with dye on heating
Data Source
AI summary
The present invention provides a compound represented by the formula (1). The compound represented by the formula (1) is a developing agent superior in both color-developing sensitivity with low energy and image stability [in the following formula, wherein R1 is a hydrogen atom, an alkyl group, an alkenyl group, an aryl group or an aralkyl group,R2 in the number of m are each independently an alkyl group, an alkenyl group, an aryl group, an aralkyl group, an alkoxy group, a halogen atom, a hydroxy group, a cyano group, a nitro group, a carboxy group or an amino group,R3 in the number of n are each independently an alkyl group, an alkenyl group, an aryl group, an aralkyl group, an alkoxy group, a halogen atom, a hydroxy group, a cyano group, a nitro group, a carboxy group or an amino group, andm and n are each independently an integer of 0-4.