Phenol Compound Color Developer for Recording Material Whiteness
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Solution Overview
Problem
Conventional recording materials fail to achieve a balance between whiteness of the background, storage properties, and dynamic sensitivity, with existing cinnamic acid amide-based compounds often becoming colored over time, leading to unsatisfactory light resistance and image quality.
Innovation Solution
A phenol compound with specific structural features, such as the cinnamic acid amide-based compound with an amide group and hydroxyl group in ortho positions, is used as a color developer, synthesized through a process involving purification of 2-aminophenol and reaction with cinnamoyl chloride in the presence of a weak alkaline inorganic compound and a polar solvent, to prevent coloring and enhance whiteness and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cinnamic acid amide-based compounds are used as color developers, then color development function is achieved, but the crystals become colored over time resulting in poor light resistance of the background
Solution Approach 1:
The invention changes the molecular structure parameters of the cinnamic acid amide-based compound by introducing specific substituents (hydroxyl group at ortho position, various R1-R4 groups) to modify the crystal packing and electronic properties, thereby preventing crystal coloring while maintaining color development function
Solution Approach 2:
The invention creates a composite molecular structure combining cinnamic acid amide backbone with additional functional groups (hydroxyl, alkyl, alkoxy, halogen, aryl groups) to achieve synergistic effects that simultaneously provide color development capability and prevent crystal degradation
2Reliability
If recording materials are designed for excellent storage property of background, then light resistance is improved, but dynamic sensitivity and whiteness are not sufficiently achieved
Solution Approach 1:
The invention optimizes molecular parameters including substituent types (R1-R4), substitution positions (ortho, meta, para), and molecular geometry to achieve a balance between storage stability and initial whiteness, with b* value ≤10 and brightness ≥75
3Productivity
If conventional color developers are used to achieve rapid color development, then dynamic sensitivity is improved, but storage stability and light resistance are compromised
Solution Approach 1:
The invention segments the molecular function into distinct components: the cinnamic acid amide core provides color development reactivity, while the ortho-hydroxyl group and other substituents provide storage stability and prevent crystal degradation, allowing each part to optimize its specific function
Solution Approach 2:
The ortho-hydroxyl group acts as an intermediary that mediates between the reactive cinnamic acid amide group and the stabilizing substituents, facilitating rapid color development while preventing unwanted side reactions that would degrade storage 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 resulting recording material exhibits excellent whiteness, storage stability, and dynamic sensitivity, with the phenol compound maintaining whiteness over time and providing high-quality color development, surpassing the limitations of previous materials.
Implementation Method 1
Recording materials utilizing color development caused through a reaction between a color former and a color developer
Data Source
AI summary
An object of the present invention is to provide a recording material or a recording sheet that is excellent not only in whiteness of a background but also in storage property for a background and an image, and further has excellent dynamic sensitivity. In order to achieve the object, a phenol compound represented by Formula (I) [wherein R1 represents a hydroxyl group or a halogen atom, p represents 0 or an integer of 1 to 5, R2 and R3 each independently represent a hydrogen atom or a C1-C6 alkyl group, R4 represents a hydrogen atom, a C1-C6 alkyl group, an optionally substituted phenyl group or an optionally substituted benzyl group; and a bond shown with a wavy line represents E- or Z-form, or a mixture thereof] and having a color space b* of 10 or less, and preferably having brightness by Hunter of 75 or more, is used as a recording material.