UV-Sensing Microcapsules with Mixed Aromatic Solvents for Storage Stability
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Solution Overview
Problem
Existing ultraviolet-sensing sheets suffer from poor storage stability and image stability, particularly when exposed to hot or moist environments, leading to color formation issues and reduced color density.
Innovation Solution
The ultraviolet-sensing member incorporates a microcapsule containing a photoactivator, color-forming agent, and aromatic solvents with and without heteroatoms, with a specific mass ratio and boiling point, encapsulated in a resin capsule wall, to enhance stability and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ultraviolet-sensing sheet uses a capsule with color-forming agent and photooxidant, then the sheet can measure ultraviolet ray amount, but the sheet forms color in unused state when left in hot environment for long period
Solution Approach 1:
The patent changes the chemical composition parameters of the sensing layer by introducing a specific catalyst inhibitor and adjusting the ratio of photooxidant to color-forming agent. This resolves the contradiction by preventing unwanted color formation during storage while maintaining sensing functionality.
Solution Approach 2:
The patent introduces a catalyst inhibitor as an intermediary substance that mediates between the photooxidant and color-forming agent, preventing premature reaction during storage while allowing controlled reaction during ultraviolet exposure.
2Duration of action of stationary object
If the ultraviolet-sensing sheet is left in moist and heat environment after use, then the sheet can be stored, but the color density of colored part decreases
Solution Approach 1:
The patent adjusts the chemical parameters of the sensing layer including the ratio of photooxidant to color-forming agent and adds a catalyst inhibitor to prevent degradation of color density in moist and heat environments during storage after use.
3Reliability
If the sensing layer contains only aromatic solvent without heteroatom, then the manufacturing is simple, but the storage stability and image stability are insufficient
Solution Approach 1:
The patent creates a composite solvent system combining aromatic solvents with and without heteroatoms in specific ratios. This composite approach improves stability while maintaining reasonable manufacturing complexity through controlled composition.
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 provides improved storage stability and image stability, ensuring accurate color formation based on ultraviolet exposure, with enhanced sensitivity and durability.
Implementation Method 1
a photoactivator, a color-forming agent, and an aromatic solvent... the aromatic solvent includes an aromatic solvent including a heteroatom and an aromatic solvent including no heteroatom
Data Source
AI summary
A first object of the present invention is to provide an ultraviolet-sensing member having excellent storage stability and image stability. In addition, a second object of the present invention is to provide a microcapsule, a production method of a microcapsule, a dispersion liquid for forming an ultraviolet-sensing layer, and an ultraviolet-sensing kit. The ultraviolet-sensing member of the present invention is an ultraviolet-sensing member including an ultraviolet-sensing layer containing a microcapsule which contains a photoactivator, a color-forming agent, and an aromatic solvent, in which the aromatic solvent includes an aromatic solvent including a heteroatom and an aromatic solvent including no heteroatom.