Recording Material Heat Resistance via Composite Color-Developing System
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Solution Overview
Problem
Existing recording materials face challenges in achieving balanced color-developing sensitivity and storage stability, particularly in terms of heat resistance and resistance to plasticizers and oils, while maintaining image quality and background whiteness.
Innovation Solution
The use of a recording material comprising a color former, a diaminodiphenyl sulfone compound as an additive, and a color-developing agent such as N-(2-(3-phenylureido)phenyl)benzenesulfonamide, which improves color-developing performance and storage stability by enhancing heat resistance, oil resistance, and plasticizer resistance of both the background and images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional color formers and color-developing agents are used to achieve quick color development, then color-developing sensitivity is improved, but heat resistance and storage stability of the background and images deteriorate
Solution Approach 1:
The patent uses a composite color-developing system combining a color former (leuco dye), a color-developing agent (aromatic amine), and a sensitizer (aromatic compound with electron-withdrawing group). This composite approach enables quick color development while simultaneously achieving excellent heat resistance and storage stability, as the synergistic interaction among components allows fast reaction kinetics without compromising the stability of the unreacted components during storage
Solution Approach 2:
The patent optimizes specific chemical parameters including the selection of leuco dye structures (e.g., fluoran, xanthene derivatives), aromatic amine developers with specific substituents, and sensitizers with electron-withdrawing groups. By carefully adjusting molecular structures, concentrations, and physical states of these components, the patent achieves both rapid color development and superior heat resistance of background and images
2Speed
If recording materials are designed for fast color development, then color-developing speed is improved, but resistance to plasticizers and oils of the colored images deteriorates
Solution Approach 1:
The composite system of color former, color-developing agent, and sensitizer creates a robust colored image with enhanced resistance to plasticizers and oils. The specific combination of leuco dye, aromatic amine, and electron-withdrawing group-containing sensitizer produces a colored complex that is inherently more resistant to degradation by plasticizers and oils while maintaining fast development speed
Solution Approach 2:
The patent employs readily available aromatic amine compounds and leuco dyes that can be stored stably and then rapidly converted to durable colored images upon contact. The unreacted components remain stable during storage, but the formed colored images exhibit long-term resistance to plasticizers and oils
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 achieves excellent heat resistance, oil resistance, and plasticizer resistance for both the background and images, ensuring stable performance over time and under various environmental conditions.
Implementation Method 1
recording material employing color development through a reaction between a color former and a color-developing agent
Data Source
AI summary
An object of the present invention is to provide a recording material and a recording sheet having excellent color-developing performance and storage stability and particularly having excellent heat-resistance of background. A recording material of the present invention contains a color former (A), a compound represented by formula (I) (B), and a compound represented by formula (II) (C) .