UV-Cured Composition with Wavelength Conversion for Deep Curing
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Solution Overview
Problem
Existing UV-cured compositions with fillers face challenges in achieving a satisfactory curing depth and high optical density due to filler absorption of UV light, which limits the effectiveness of ambient light blocking.
Innovation Solution
A composition comprising a wavelength conversion compound that absorbs UV light and emits visible light, combined with a crosslinkable monomer, polymerization monomer, filler, photoinitiator, and thermocatalyst, which allows for deeper curing and higher optical density when cured with UV light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fillers are added to the composition to achieve high optical density, then light blocking performance is improved, but UV light absorption by fillers reduces curing depth
Solution Approach 1:
The patent introduces a wavelength conversion compound as an intermediary substance that absorbs UV light and converts it to visible light. This mediator enables the curing process to proceed deeper into the composition by transforming the harmful UV absorption into useful visible light that can penetrate further and initiate photopolymerization at greater depths, thus resolving the contradiction between achieving high optical density with fillers and maintaining satisfactory curing depth
Solution Approach 2:
The patent changes the wavelength parameter of light used for curing by incorporating wavelength conversion compounds that transform UV light (shorter wavelength) into visible light (longer wavelength). This parameter change allows the curing system to overcome the UV absorption limitation imposed by fillers, enabling both high optical density and deep curing to be achieved simultaneously
2Productivity
If UV light curing is performed for a short time to improve productivity, then process time is reduced, but achieving both high optical density and satisfactory curing depth becomes difficult
Solution Approach 1:
The patent achieves continuous and effective curing throughout the composition by using wavelength conversion compounds that convert UV light to visible light, which penetrates deeper into the material. This creates a continuous curing action from the surface to the deep interior, allowing short curing times to produce reliable results with both high optical density and satisfactory curing depth throughout the entire cured product
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 composition achieves a curing depth of 200 μm or more and an optical density of 2 or more at a thickness of 30 μm, effectively blocking ambient light while maintaining a short curing time.
Implementation Method 1
a wavelength conversion compound that absorbs a wavelength A and emits a wavelength B different from the wavelength A
Implementation Method 2
a wavelength conversion compound that absorbs a wavelength A and emits a wavelength B different from the wavelength A
Implementation Method 3
a photoinitiator
Data Source
AI summary
Provided is a composition including a wavelength conversion compound that absorbs a wavelength A and emits a wavelength B different from the wavelength A, a crosslinkable monomer, a polymerization monomer, a filler, and a photoinitiator.