Microstructured Film Nanoparticles Impact Resistance
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Solution Overview
Problem
Existing brightness enhancing films face challenges in achieving optimal impact resistance and light management, as they often suffer from visible damage and inefficient light recycling due to their microstructured surfaces.
Innovation Solution
The development of microstructured films with a polymerizable composition comprising at least 20 wt-% of surface-modified inorganic nanoparticles with a refractive index of 1.68 or higher, combined with non-aromatic multi-(meth)acrylate monomers and mono(meth)acrylate diluents, which are energy-curable and have a low viscosity, allowing for improved light refraction and reflection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polymerizable compositions are used to form microstructured surfaces, then the films can be manufactured with standard materials, but the impact resistance is insufficient and visible damage occurs
Solution Approach 1:
The patent employs a composite polymerizable composition containing inorganic nanoparticles (20-80 wt%), organic monomers (15-70 wt%), and reactive diluents (5-65 wt%). This composite formulation creates a microstructured surface with enhanced mechanical properties and impact resistance while maintaining optical clarity, thereby reducing visible damage upon impact
Solution Approach 2:
The patent modifies the chemical composition parameters of the polymerizable composition by incorporating specific ratios of inorganic nanoparticles, monomers with different functional groups, and reactive diluents. These parameter changes optimize the balance between impact resistance and optical properties, enabling the surface to withstand impact while maintaining visibility characteristics
2Illumination intensity
If microstructured surfaces are formed to enhance light management, then light refraction and reflection improve, but the composition viscosity increases making manufacturing difficult
Solution Approach 1:
The patent introduces reactive diluents (5-65 wt%) as intermediary substances that reduce the viscosity of the polymerizable composition. These diluents facilitate easier mixing and coating processes while the incorporated inorganic nanoparticles and monomers maintain the light management functionality through refraction and reflection properties
Solution Approach 2:
The patent adjusts the composition parameters by controlling the weight percentages of inorganic nanoparticles (20-80 wt%), organic monomers (15-70 wt%), and reactive diluents (5-65 wt%). This parameter optimization ensures the composition has suitable viscosity for manufacturing while maintaining the microstructured surface's light refraction and reflection capabilities
3Illumination intensity
If high concentrations of inorganic nanoparticles are used to improve refractive index, then light refraction improves, but the composition becomes too viscous for practical application
Solution Approach 1:
The patent uses reactive diluents as intermediary agents to counterbalance the viscosity increase caused by high concentrations of inorganic nanoparticles (20-80 wt%). These diluents enable the composition to maintain high refractive index for improved light refraction while remaining sufficiently fluid for practical coating and manufacturing operations
Solution Approach 2:
The patent creates a composite system where inorganic nanoparticles (20-80 wt%), organic monomers (15-70 wt%), and reactive diluents (5-65 wt%) work synergistically. The inorganic nanoparticles provide high refractive index for superior light refraction, while the organic components and diluents maintain appropriate viscosity levels for manufacturability
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
These films enhance on-axis luminance, reduce power consumption, and exhibit reduced damage contrast upon impact, demonstrating improved impact resistance and efficient light management capabilities.
Implementation Method 1
inorganic nanoparticles which are surface modified and have a refractive index of at least 1.68... improved light refraction and reflection properties
Implementation Method 2
inorganic nanoparticles which are surface modified and have a refractive index of at least 1.68... improved light refraction and reflection properties
Implementation Method 3
the polymerizable composition comprising at least 20 wt-% of inorganic nanoparticles... non-aromatic multi-(meth)acrylate monomer... and mono(meth)acrylate diluent... which are energy-curable
Data Source
AI summary
Presently described are microstructured films, such as brightness enhancing films, having a microstructured surface. The microstructured surface comprises the reaction product of a polymerizable composition comprising at least 20 wt-% of inorganic nanoparticles and a non-aromatic multi-(meth)acrylate monomer comprising at least three contiguous alkylene oxide repeat units. The multi-(meth)acrylate monomer typically comprises two or three (meth)acrylate groups. The alkylene oxide repeat units have the formula -[O-L]- wherein each L is independently a C2-C6 alkylene. Also described is a polymerizable resin composition comprising at least 20 wt-% of inorganic nanoparticles having a refractive index of at least 1.68 and a non-aromatic multi-(meth)acrylate monomer comprising at least three contiguous alkylene oxide repeat units.