Prism Sheet Curing Composition for Refractive Index and Abrasion Resistance
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Solution Overview
Problem
Existing prism sheets face challenges in achieving both high refractive index and good abrasion resistance due to the trade-off between flexibility and chipping resistance, particularly with materials having high refractive indices.
Innovation Solution
A prism sheet comprising a micro concave-convex structure layer formed from an active energy ray curing composition containing 40% or more inorganic nanoparticles, such as zirconia, with specific indentation depth and elastic deformation properties, and a transparent substrate layer, optimized for mechanical properties and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a material having a high refractive index is used, then the refractive index is improved, but the flexibility of the resin cured product decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the resin by incorporating specific monomers (acrylonitrile, methacrylonitrile, or cyanogen bromide) in controlled amounts (0.1-10 mass%) to modify the polymerization characteristics and crosslinking density, achieving a balance between high refractive index and maintained flexibility
Solution Approach 2:
The patent creates a composite resin system combining multiple components: base resin, high-refractive-index particles, and specific monomer additives, where the synergistic effect of these components achieves both high refractive index and adequate flexibility that neither component could achieve alone
2Illumination intensity
If a material having a high refractive index is used, then the refractive index is improved, but the abrasion resistance deteriorates
Solution Approach 1:
The patent modifies the resin composition parameters by adding specific monomers that influence crosslinking density and molecular weight distribution, which directly affects abrasion resistance while maintaining the high refractive index property
Solution Approach 2:
The patent develops a composite material system combining resin, high-refractive-index particles, and functional monomers where the composite structure provides both optical performance (high refractive index) and mechanical durability (abrasion resistance) through the synergistic interaction of components
3Illumination intensity
If the convex shape is made sharp to improve optical function, then the optical performance is improved, but the chipping due to friction increases
Solution Approach 1:
The patent changes the material parameters (resin composition, crosslinking density, molecular weight) to optimize the mechanical strength of the convex portions, allowing sharp geometric shapes to maintain structural integrity and resist chipping during handling and operation
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 achieves both high refractive index and excellent abrasion resistance by ensuring a minimum indentation depth and elastic deformation power, enhancing the sheet's durability and flexibility.
Implementation Method 1
a material having a high refractive index or adding organic or inorganic high-refractive-index fine particles has been proposed
Implementation Method 2
a micro concave-convex structure layer which is a cured product of an active energy ray curing composition
Data Source
AI summary
According to the present invention, both good abrasion resistance and a high refractive index can be achieved with a material having a certain parameter, as evaluated using a flat indenter to evaluate mechanical properties of a convex portion of a prism sheet. The prism sheet of the present invention includes a micro concave-convex structure layer which is a cured product of an active energy ray curing composition containing 40 mass % or more of inorganic nanoparticles, and a transparent substrate layer. The micro concave-convex structure layer has a micro concave-convex structure with a period of 20 μm to 100 μm on a surface thereof. The micro concave-convex structure layer has an indentation depth (hmax) of 8 μm or more at a maximum test force and an elastic deformation power (nIT) of 50% or more.