Curable Silicone Encapsulant for Low-Temperature Optical Device Curing
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Solution Overview
Problem
Conventional curable silicone compositions for optical semiconductor devices face challenges such as requiring high-temperature curing, which can cause substrate warping and degrade patterning precision, and result in colored cured products with insufficient surface smoothness and wettability on organic substrates.
Innovation Solution
A curable silicone composition comprising a resinous alkenyl group-containing organopolysiloxane, a resinous organo-hydrogen polysiloxane, an additive with wettability improving effects like polyether-modified organopolysiloxane, and a platinum-based curing catalyst, which allows for efficient curing at low temperatures, achieving transparency, high hardness, and smooth surface finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional curable silicone compositions are used, then high-temperature curing is required to achieve adequate curability, but this causes substrate warping and degrades patterning precision
Solution Approach 1:
The patent changes the chemical parameters of the silicone composition by incorporating specific additives (polyether-modified organopolysiloxane, phenol-modified organopolysiloxane, terminal hydroxy group-containing dimethylpolysiloxane, and phenolic antioxidants) that enable the curing reaction to proceed efficiently at lower temperatures, thus resolving the contradiction between achieving adequate curability and maintaining patterning precision
Solution Approach 2:
The patent creates a composite curable silicone composition by combining multiple types of organopolysiloxane components with specific additives, where each component contributes different properties that collectively enable low-temperature curing while maintaining curability and preventing substrate warping
2Reliability
If conventional curable silicone compositions are used, then high-temperature curing is required, but this results in colored cured products with insufficient surface smoothness and wettability
Solution Approach 1:
The patent modifies the curing parameters by using additives that facilitate low-temperature curing reactions, which prevents coloration and maintains surface smoothness while still achieving adequate curability of the silicone composition
Solution Approach 2:
The patent introduces phenolic antioxidants and polyether-modified organopolysiloxane as intermediary substances that mediate the curing process, enabling it to proceed at lower temperatures and thus preventing coloration while maintaining surface quality
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 exhibits effective pot life, excellent curability at low temperatures, and forms a cured product with high transparency and hardness, even after prolonged high-temperature exposure, while maintaining good wettability and surface smoothness.
Implementation Method 1
curable organopolysiloxane compositions that harden via a hydrosilylation reaction
Implementation Method 2
a platinum-based curing catalyst, which allows for efficient curing at low temperatures
Data Source
AI summary
Provided is a curable silicone composition which exhibits a practically effective pot life, is curable at a low temperature, and which can be used to form a cured product that has superior surface smoothness, is transparent, and has high hardness. This curable silicone composition contains: (A) a resinous alkenyl group-containing organopolysiloxane having, per molecule, at least two alkenyl groups and at least one aryl group; (B) a resinous organohydrogenpolysiloxane having, in one molecule, at least two hydrogen atoms bonded to silicon atoms; (C) a molecular chain side chain polyether-modified organopolysiloxane, a phenyl-modified organopolysiloxane, a non-terminal hydroxyl group-containing dimethyl polysiloxane that does not contain an aryl group, and a phenolic antioxidant, as well as an adhesive that has a wettability improvement effect and is selected from a combination of these; and (D) a curing reaction inhibitor.