Polymeric (Meth)Acrylic Composition with Bimodal Silicone-Acrylic Particles
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Solution Overview
Problem
Current polymeric compositions for lighting applications fail to achieve a balance between high light transmission and diffusing properties, as existing compositions either have low transmission or require excessive scattering particles, lacking a suitable masterbatch or process to optimize particle ratios for optimal optical performance.
Innovation Solution
A polymeric (meth)acrylic composition comprising polymeric silicone particles with a weight average diameter between 1µm and 10µm and polymeric (meth)acrylic particles with a weight average diameter between 30µm and 100µm, where the silicone particles represent between 0.5wt% and 15wt% and the (meth)acrylic particles represent between 40wt% and 80wt%, with specific refractive indices and melt flow indices, used as a masterbatch to achieve high light transmission and diffusing power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If scattering particles are added to increase diffusing power, then hiding power and diffusing properties are improved, but light transmission decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size distribution (bimodal or multimodal with specific diameter ranges), refractive index differences between particles and matrix, and particle concentration ratios. These parameter optimizations enable enhanced light diffusion while maintaining high transmission by finding the optimal balance point where scattering is sufficient for diffusion but not excessive to block light.
Solution Approach 2:
The patent uses composite materials by combining multiple types of particles (silicone particles, acrylic particles, or other polymer particles) with different refractive indices and size distributions within the same polymeric composition. This composite approach allows synergistic effects where different particle types contribute to diffusion while minimizing overall scattering losses, achieving both high diffusing power and high light transmission simultaneously.
2Illumination intensity
If quantity of scattering particles is increased to improve hiding power, then light diffusion is enhanced, but light transmission is reduced
Solution Approach 1:
The patent optimizes the concentration parameters of scattering particles within specific ranges (e.g., 0.1-10 parts by weight per 100 parts of polymeric matrix) rather than simply maximizing particle quantity. This parameter optimization ensures sufficient hiding power through controlled scattering while preventing excessive particle loading that would block light transmission.
Solution Approach 2:
The patent applies local quality by creating specific zones or distributions of particles with different sizes and refractive indices throughout the matrix. The bimodal or multimodal size distribution ensures that smaller particles provide uniform scattering for hiding power while larger particles contribute to diffusion, with the overall distribution optimized to maintain high light transmission.
3Ease of manufacture
If wrong particle ratio is used in polymeric composition, then manufacturing is simplified, but optical properties are not optimized
Solution Approach 1:
The patent applies preliminary action by pre-defining and pre-mixing particles in specific weight ratios (e.g., silicone particles 0.1-10 parts, acrylic particles 1-20 parts per 100 parts matrix) during masterbatch preparation. This preliminary proportioning ensures that the correct particle ratio is established before final product manufacturing, simplifying the manufacturing process while guaranteeing optimal optical properties through controlled composition.
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 high light transmission (at least 80%) with enhanced diffusing and hiding power, effectively masking the light source while minimizing scattering particles, thereby optimizing optical properties for lighting applications.
Implementation Method 1
The composition achieves high light transmission (at least 80%) with enhanced diffusing and hiding power
Data Source
AI summary
The present invention relates to apolymeric(meth) acrylic composition comprising polymeric silicone particlesand optionally polymeric (meth)acrylic particles. Inparticular the present invention relates to a polymeric(meth) acrylic composition comprising polymeric silicone particleshaving a weight average particle diameter between 1µm and 10µmand optionally polymeric (meth)acrylic particles with ahaving a weight average particle diameter between 30µm and 100µm. The present invention concerns alsothe use of such apolymeric (meth) acrylic composition comprising polymeric silicone particles and optionally polymeric (meth)acrylic particlesas a masterbatch. The present invention concerns alsoa process for making a (meth)acrylic compositioncomprising polymeric silicone particles and polymeric (meth)acrylic particles from apolymeric(meth) acrylic masterbatch composition comprising polymeric silicone particlesand optionally polymeric (meth)acrylic particles.