Curable Composition for LED Encapsulation

The patent employs a composite material system consisting of polyorganosiloxane base resin combined with specific inorganic fillers (silica, alumina, titania) and fluorescent materials. This composite structure achieves both high mechanical durability from the crosslinked siloxane network and excellent light transmittance in blue/UV regions through careful selection of filler materials with appropriate refractive indices and optical properties, thereby resolving the contradiction between mechanical strength and optical performance.

The patent utilizes parameter changes by controlling the molecular weight, hydroxyl value, and compositional ratios of polyorganosiloxane components, along with adjusting filler content and particle size distribution. These parameter optimizations enable the material to simultaneously achieve high adhesiveness, mechanical durability, and superior light transmittance in the blue/UV spectrum, overcoming the limitations of conventional epoxy resins.

The patent creates a composite material system where polyorganosiloxane base resin is combined with inorganic fillers (silica, alumina, titania) and fluorescent materials. The siloxane backbone provides inherent UV resistance and stability, while the inorganic fillers enhance both mechanical adhesion and optical stability under LED irradiation, achieving simultaneous improvement in adhesiveness and light resistance that epoxy resins cannot provide.

The patent optimizes parameters including hydroxyl value (5-50 mg KOH/g), molecular weight, and compositional ratios of polyorganosiloxane components. These parameter controls enable the material to achieve high adhesiveness through controlled crosslinking density while maintaining excellent light resistance and preventing yellowing under prolonged LED operation, thereby resolving the contradiction between adhesion and optical stability.