Silicone Encapsulant Composition for Thixotropy and Optical Transparency
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Solution Overview
Problem
Existing curable silicone compositions used in optical semiconductor devices suffer from insufficient thixotropy, leading to flow and shape inconsistencies during application, and the addition of silica particles to improve thixotropy results in reduced transparency.
Innovation Solution
Incorporating silica-titania composite oxide particles as a filler in the curable silicone composition, along with alkenyl group-containing organopolysiloxane, organo-hydrogen polysiloxane, and a curing catalyst, to enhance thixotropy, refractive index, and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica particles are added to improve thixotropy, then thixotropy is improved, but transparency is reduced
Solution Approach 1:
The patent uses a composite filler system combining silica-titania composite oxide particles with specific organopolysiloxane compounds. This composite approach allows achieving both thixotropy and transparency by leveraging the complementary properties of each component, avoiding the transparency loss associated with conventional silica particles alone.
Solution Approach 2:
The patent optimizes multiple parameters simultaneously: particle size of the silica-titania composite oxide, composition ratios of organopolysiloxane compounds, and curing conditions. By precisely controlling these parameters, the invention achieves both adequate thixotropy and high transparency in the hardened material.
2Ease of operation
If conventional curable silicone composition is applied, then ease of application is maintained, but shape retention is poor due to insufficient thixotropy
Solution Approach 1:
The patent employs a thixotropic agent that provides temporary structural support during application and then allows proper curing. The composition maintains ease of application while the thixotropic properties enable shape retention during the curing process, resolving the contradiction between ease of operation and shape retention.
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 forms hardened materials with excellent transparency, hardness, and desired shape retention while maintaining high refractive index, addressing the thixotropy issues of previous compositions.
Implementation Method 1
the curable silicone composition shows outstanding thixotropy ideal for forming the desired shape
Implementation Method 2
hydrosilylation-curable organopolysiloxane composition
Data Source
AI summary
To offer curable silicone compositions with outstandingly high thixotropy, which can form hardened material with an outstanding refractive index transparency.The problem above is solved by curable silicone compositions which include (A) alkenyl group-containing organopolysiloxane which has at least two silicon-bonded alkenyl groups per molecule, (B) organo-hydrogen polysiloxane which has at least two silicon-bonded hydrogen atoms per molecule, (C) silica-titania composite oxide particles at ≥3 mass % of the total mass of the composition, and (D) a curing catalyst.