Curable Organopolysiloxane Composition for Light Diffusion and Strength
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Solution Overview
Problem
There is a need for a light diffusing material with excellent light transmittance, light diffusion properties, and mechanical properties, particularly one that is durable enough for reflow soldering and can enhance light extraction efficiency from light emitting devices like LEDs.
Innovation Solution
A curable organopolysiloxane composition is developed, comprising an organopolysiloxane with radical reactive groups and/or hydrosilylation reactive groups, inorganic fillers such as spherical silica or alumina, and an organosilicon compound. This composition achieves a balance between optical and mechanical properties through a specific formulation and curing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a silicone resin composition is used as a light diffusing material, then light diffusion properties are improved, but light transmittance and mechanical properties deteriorate
Solution Approach 1:
The patent uses a composite material system combining organopolysiloxane base polymer, crosslinking agent, and inorganic fillers (silica, alumina) to achieve both light diffusion and mechanical strength. The specific formulation with 10-50 mass% inorganic filler content creates a composite that balances optical and mechanical properties simultaneously.
Solution Approach 2:
The patent optimizes specific parameters including inorganic filler particle size (0.1-10 μm), filler content (10-50 mass%), and base polymer viscosity (10-10,000 cP) to achieve the desired balance between light diffusion and mechanical properties. The controlled particle size distribution is critical for maintaining both optical performance and structural integrity.
2Illumination intensity
If inorganic fillers are added to improve light diffusion, then light diffusion properties are improved, but breaking elongation deteriorates
Solution Approach 1:
The patent specifies that inorganic fillers should have a particle size of 0.1-10 μm with preferred range of 1-5 μm. This local quality control of particle size ensures adequate light diffusion while minimizing the adverse effect on breaking elongation. The controlled particle size distribution allows light scattering without creating excessive stress concentration points.
Solution Approach 2:
The patent optimizes the inorganic filler content to be 10-50 mass% of the total composition. This parameter range is critical: below 10% provides insufficient light diffusion, while above 50% significantly reduces breaking elongation. The crosslinking agent content is also optimized at 5-50 mass% to maintain mechanical strength despite the presence of inorganic fillers.
3Illumination intensity
If high inorganic filler content is used to enhance light diffusion, then light diffusion properties are improved, but mechanical strength and hardness deteriorate
Solution Approach 1:
The patent establishes an optimal parameter range where inorganic filler content is 10-50 mass% and crosslinking agent content is 5-50 mass%. Within these ranges, the composition achieves adequate light diffusion while maintaining mechanical strength and hardness suitable for optical applications. The base polymer viscosity is also controlled at 10-10,000 cP to ensure proper processing and final mechanical properties.
Solution Approach 2:
The patent creates a composite formulation that combines organopolysiloxane base polymer with specific inorganic fillers (silica, alumina) and crosslinking agents. This composite structure allows the material to achieve both optical functionality and mechanical strength, as the organic polymer matrix provides flexibility and strength while the inorganic fillers provide light diffusion.
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 cured product exhibits improved light transmittance, enhanced light diffusion properties, and increased breaking elongation, making it suitable for use in optical members and as a sealing agent for LEDs. It maintains mechanical strength and hardness while being durable enough for thick optical applications.
Implementation Method 1
an organopolysiloxane (A) having, in the molecule, at least two radical reactive groups and/or a reactive group capable of crosslinking via a hydrosilylation reaction
Implementation Method 2
a reactive group capable of crosslinking via a hydrosilylation reaction
Implementation Method 3
one or more inorganic fillers selected from the group consisting of spherical silica particles, spherical alumina particles
Implementation Method 4
at least 10 mol% of the overall organic groups bonded to silicon atoms in the molecule are aryl groups
Data Source
Figure 1~2
AI summary
[Problem] To provide a new light diffusing material, etc. with excellent light transmittance, light diffusion properties, and mechanical properties. [Resolution Means] The material of the present invention consists of a curable organopolysiloxane composition, containing the following components A to C: A) an organopolysiloxane having, in the molecule, at least two radical reactive groups and/or a reactive group capable of crosslinking via a hydrosilylation reaction, wherein at least 10 mol% of the overall organic groups bonded to silicon atoms in the molecule are aryl groups; B) one or more inorganic fillers; and C) an organosilicon compound different from component A, the organosilicon compound comprising the following C1 and C2: C1) an organosilicon compound different from component A, the organosilicon compound having: a reactive functional group capable of bonding to a reactive group contained in component A; and a hydrolyzable silyl group and/or a silicon atom-bonded hydroxyl group, in addition to having two or more silicon atoms in the molecule; and C2) an organosilicon compound different from component A, the organosilicon compound having: a reactive functional group having three or more carbon atoms capable of bonding to a reactive group contained in component A; and a hydrolyzable silyl group and/or a silicon atom-bonded hydroxyl group, in addition to having one or more silicon atoms in the molecule, wherein the mass of component B is 30 to 95% relative to the mass of the overall composition, and wherein the material has excellent properties such as photocurability, light diffusion, etc.