Curable Silicone Composition for Optical Semiconductor Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Curable silicone compositions used in optical semiconductor devices face issues such as low mold-filling performance, void generation, poor mold releasability, slow curing rates, and poor mechanical strength, especially at elevated temperatures, along with inadequate light reflectance and thermal stability.
Innovation Solution
A curable silicone composition comprising specific organopolysiloxanes, a hydrosilylation reaction catalyst, white pigment, and inorganic fillers, which provides improved moldability, mechanical strength, and light reflectance, and is formulated to minimize thermal and photodegradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional curable silicone compositions are used, then light-reflecting function is provided, but mold-filling performance is low and voids are generated
Solution Approach 1:
The patent changes the chemical composition parameters of the silicone resin system by selecting specific base resins with controlled vinyl group content and using particular organohydrogenpolysiloxane crosslinkers, which modifies the rheological properties and curing characteristics to improve mold filling and eliminate voids
Solution Approach 2:
The patent creates a composite curing system combining specific silicone base resins, crosslinking agents, and catalysts that work synergistically to achieve both excellent moldability and void-free curing, resolving the contradiction between manufacturing quality and product reliability
2Productivity
If conventional curable silicone compositions are used, then curing is achieved, but curing rate is slow and workability is poor
Solution Approach 1:
The patent optimizes the catalyst system parameters by selecting specific platinum catalysts and controlling their concentration, along with adjusting the vinyl-to-silane ratio, to achieve rapid curing that maintains excellent processability and mold release characteristics
Solution Approach 2:
The patent incorporates reaction inhibitors that prevent premature curing during mixing and molding operations, then allows rapid curing to proceed once the composition is placed in the mold, thereby improving both workability and curing rate
3Strength
If conventional curable silicone compositions are used, then curing is achieved, but mechanical strength at elevated temperatures is poor
Solution Approach 1:
The patent develops a composite crosslinked network structure by combining organohydrogenpolysiloxane crosslinkers with specific base resins, creating a densely crosslinked gel structure that maintains mechanical strength at elevated temperatures while resisting thermal degradation
Solution Approach 2:
The patent modifies the crosslinking density parameters by controlling the ratio of crosslinking agent to base resin and adjusting the molecular weight of components, achieving optimal balance between high-temperature mechanical strength and thermal stability
4Illumination intensity
If conventional curable silicone compositions are used, then light-reflecting function is provided, but light reflectance is inadequate
Solution Approach 1:
The patent creates a composite light-reflecting system by combining white pigments with a transparent silicone cured product matrix, achieving high light reflectance while maintaining excellent moldability and curing characteristics through proper formulation
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 excellent moldability, high light reflectance, and dimensional stability with minimal heat- and light-induced mechanical strength decline, making it suitable for optical semiconductor devices.
Implementation Method 1
Curable silicone compositions that cure by a hydrosilylation reaction
Data Source
Figure 1
AI summary
A curable silicone composition which comprises: (A) an organopolysiloxane represented by an average unit formula; (B) an organopolysiloxane that has not more than 10 silicon atoms wherein from 30 to 60 mole% of all silicon-bonded organic groups therein are C2-6191 alkenyl groups; (C) an organopolysiloxane represented by a general formula; (D) an organopolysiloxane that has at least two silicon-bonded hydrogen atoms in one molecule wherein from 20 to 70 mole% of all silicon-bonded organic groups therein are phenyl groups; (E) a hydrosilylation reaction catalyst; (F) a white pigment; (G) a nonspherical silica or a glass fiber; and (H) a spherical silica, exhibits an excellent moldability and forms a cured product that exhibits little heat- and/or light-induced discoloration, little heat- and/or light-induced decline in mechanical strength, a high light reflectance, and an excellent dimensional stability.