Rubber-Modified Styrene Resin Light Diffusion Plate
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Solution Overview
Problem
Conventional rubber-modified styrene-based resins exhibit high yellow index of transmitted light and low light diffusibility, impacting their suitability for applications like liquid crystal displays and televisions, where low moisture absorbency and high impact resistance are also required.
Innovation Solution
A rubber-modified styrene-based resin with a specific structure, comprising 1-10 wt% rubber-like polymer particles dispersed in a styrene-based polymer matrix, with particle diameters between 1.0 to 5.0 μm and a (styrene-based polymer weight/rubber-like polymer weight) ratio of 0.5 to 1.5, enhancing light diffusibility, transmissivity, and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rubber-modified styrene-based resin is used to improve impact resistance, then impact resistance is improved, but the yellow index of transmitted light becomes high and light diffusibility decreases
Solution Approach 1:
The patent changes the particle size parameter of rubber particles to 1.0-5.0 μm (optimal 1.5-3.0 μm) and controls the accumulation volume ratio to 10-80%, which resolves the contradiction by achieving both impact resistance and low yellow index simultaneously
Solution Approach 2:
The patent creates a composite structure where rubber particles with specific size and accumulation are integrated into the styrene-based resin matrix, producing a material that simultaneously achieves impact resistance, low yellow index, and good light diffusibility
2Illumination intensity
If fine particles are blended with transparent resin to improve light diffusibility, then light diffusibility is improved, but affinity with resin decreases and impact resistance is reduced
Solution Approach 1:
The patent optimizes the particle size of rubber particles to 1.0-5.0 μm and controls the accumulation volume ratio to 10-80%, which provides sufficient light scattering for good diffusibility while maintaining adequate affinity and impact resistance
3Strength
If multi-layer polymer particles are added to improve impact resistance, then impact resistance is improved, but the yellow index of transmitted light becomes high
Solution Approach 1:
The patent uses single-phase rubber particles with diameter 1.0-5.0 μm instead of multi-layer polymer particles, and controls the accumulation volume ratio to 10-80%, which achieves impact resistance while maintaining low yellow index
4Illumination intensity
If rubber particle diameter is reduced to improve light diffusibility, then light diffusibility is improved, but impact resistance decreases
Solution Approach 1:
The patent optimizes rubber particle diameter to 1.0-5.0 μm (not too small to maintain impact resistance, not too large to ensure light diffusibility) and controls accumulation volume ratio to 10-80%, achieving balance between both properties
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 resin achieves low yellow index, excellent light diffusibility, and improved impact resistance, making it suitable for use in light diffusion plates for liquid crystal displays and televisions.
Implementation Method 1
rubber-like polymer particles dispersed in the matrix like islands, each of the rubber-like polymer particles having a cross sectional structure where the styrene-based polymer particles are contained like islands-sea
Data Source
AI summary
Disclosed is a rubber-modified styrene-based resin comprising a styrene-based polymer forming a matrix and rubber-like polymer particles dispersed in the matrix like islands, each of the rubber-like polymer particles having a cross sectional structure where the styrene-based polymer particles are contained like islands-sea, wherein the rubber-modified styrene-based resin is constituted of 1-10 wt % of the rubber-like polymer and 99-90 wt % of the styrene-based polymer; the particle-diameter of the rubber-like polymer particle falls within a range of 1.0 to 5.0 μm; and a value of (styrene-based polymer weight/rubber-like polymer weight) in a methylethylketone-insoluble matter of the rubber-modified styrene-based resin falls within a range of 0.5 to 1.5.