(Meth)acrylic Composition for Optical Resin with High Refractive Index
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Solution Overview
Problem
Existing (meth)acrylate compositions with high refractive indices and low viscosities face challenges with crystal precipitation during storage at low temperatures, limiting their practical application in optical components.
Innovation Solution
A (meth)acrylate composition comprising a specific structure, mixed with a compound represented by General formula (2), in a predetermined mass ratio, which suppresses crystal precipitation and maintains low viscosity, achieving a high refractive index upon curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a monofunctional (meth)acrylate with high refractive index is used, then the refractive index of the composition is improved, but the viscosity reduction effect on high-refractive-index polyfunctional (meth)acrylate is insufficient
Solution Approach 1:
The patent combines a monofunctional (meth)acrylate with high refractive index and a polyfunctional (meth)acrylate in specific proportions to create a composite composition. This composite approach allows the high refractive index component to contribute to the overall refractive index while the polyfunctional component effectively reduces viscosity, resolving the contradiction between achieving high refractive index and maintaining good flow properties.
2Reliability
If the composition is stored at low temperature (0°C or lower) to prevent polymerization, then polymerization prevention is improved, but crystal precipitation occurs in the composition
Solution Approach 1:
The patent modifies the chemical composition parameters by selecting specific monofunctional and polyfunctional (meth)acrylates with appropriate molecular structures and ratios. This parameter optimization allows the composition to remain stable without polymerization even at higher storage temperatures, eliminating the need for low-temperature storage and preventing crystal precipitation.
3Illumination intensity
If a polyfunctional (meth)acrylate with high refractive index is used, then the refractive index is improved, but the viscosity becomes too high for thin coating applications
Solution Approach 1:
The patent creates a composite system combining polyfunctional (meth)acrylates with high refractive index with monofunctional (meth)acrylates in optimized ratios. The polyfunctional component provides high refractive index, while the monofunctional component acts as a viscosity modifier, enabling the composition to achieve both high refractive index and low viscosity suitable for thin coating applications.
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 refractive index of 1.580 or higher and viscosity below 10,000 mPa·s, preventing crystal precipitation during storage at low temperatures, making it suitable for optical applications.
Implementation Method 1
the composition is an active energy ray-curable composition
Data Source
AI summary
The present invention provides: a composition which has a low viscosity, a high refractive index when being cured, and in which the precipitation of crystals is suppressed for a long time when stored at a low temperature; and a paint comprising the same. According to one embodiment of the present invention, provided is a composition which includes: a (meth)acrylate represented by general formula (1); and a compound represented by general formula (2), wherein the mass percentage of the content of the (meth)acrylate to the content of the compound represented by general formula (2) is 60:40 to 90:10 (exclusive of 60:40 and 90:10).