Optically Diffusive Plastic Stiffness and Light Dispersion
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Solution Overview
Problem
There is a need for optically diffusive plastics that can offer high stiffness, impact strength, and a high Degree of Light Dispersion (DLD) value while being lightweight, surpassing the limitations of glass and other engineered plastics in these aspects.
Innovation Solution
The development of optically diffusive plastics comprising a polymer resin matrix, glass filler, and a light diffusing component, where the refractive index difference between the matrix and the glass filler is minimized to enhance light transmittance and stiffness, with specific formulations achieving DLD values greater than or equal to 1° and flexural modulus of over 2,500 MPa.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass is used to make diffusers and lenses, then stiffness and optical diffusivity are improved, but weight and impact resistance worsen
Solution Approach 1:
The patent applies composite materials by combining polymer resin (for light weight and impact resistance) with glass filler (for stiffness enhancement). The glass filler is incorporated into the polymer matrix in specific amounts (5-50 wt%) to achieve the desired balance of properties, resolving the contradiction between stiffness and weight.
Solution Approach 2:
The patent changes the refractive index parameter of the glass filler to match closely with the polymer resin matrix (difference of 0.002 to 0.02). This parameter optimization improves both stiffness and optical properties simultaneously, while maintaining the lightweight advantage of plastic over glass.
2Strength
If glass filler is added to polymer resin, then stiffness is improved, but light transmittance worsens
Solution Approach 1:
The patent optimizes the refractive index parameter of the glass filler to be very close to that of the polymer resin matrix (difference of only 0.002 to 0.02). This minimizes light scattering at the interface between filler and matrix, thereby maintaining high light transmittance while achieving the desired stiffness enhancement from the glass filler.
Solution Approach 2:
The patent uses light diffusing components with specific refractive indices in localized amounts (0.1 to 10 wt%) to control light scattering behavior in specific regions of the material, allowing simultaneous achievement of stiffness and optical performance.
3Weight of moving object
If PC is used to make diffusers, then weight is reduced, but stiffness worsens
Solution Approach 1:
The patent creates a composite material system where polycarbonate or other polymers serve as the lightweight matrix, and glass filler provides the stiffness enhancement. This composite approach allows the material to achieve glass-like stiffness while retaining the inherent weight advantages of plastic materials.
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 plastics provide improved impact resistance, stiffness, and balanced light transmittance and diffusive effects, allowing for reduced weight and thickness while maintaining durability, thus addressing the limitations of glass and other polymeric compositions.
Implementation Method 1
optically diffusive plastic can comprise: 40 to 94.9 mass% of a polymer resin matrix; 5 to 50 mass% of a glass filler; and 0.1 to 10 mass% of a light diffusing component; wherein the difference between refractive index of the polymer resin matrix and refractive index of the glass filler is 0.002 to 0.02; wherein a 1 millimeter (mm) thick sample of the optically diffusive plastic comprises a Degree of Light Dispersion (DLD) value of greater than or equal to 1 degree (°) as measured by goniophotometry
Data Source
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AI summary
An optically diffusive plastic can comprise 40 to 94.9 mass% of a polymer resin matrix; 5 to 50 mass% of a glass filler; and 0.1 to 10 mass% of a light diffusing component; wherein the difference between refractive index of the polymer resin matrix and refractive index of the glass filler is less than or equal to 0.02; wherein a 1 millimeter (mm) thick sample of the optically diffusive plastic comprises a DLD value of greater than or equal to 1 degree (°) as measured by goniophotometry; wherein the 1 mm thick sample comprises a total transmittance of greater than or equal to 40% for incident light having a wavelength of 360 nanometers (nm) to 750 nm in air; and wherein a 3.2 mm thick sample of the optically diffusive plastic comprises a flexural modulus, measured at 23 °C, of greater than or equal to 2,500 Megapascal (MPa).