Dow Toray Co., Ltd.

Mayumi Matsuzaki

Masaaki Amako

Kasumi Takeuchi

A curable silicone composition is disclosed. The composition comprises: (A) a hydrosilylation-reactive resin-linear block copolymer type organopolysiloxane; (B) an organopolysiloxane resin containing a curing-reactive group having a carbon-carbon double bond in the molecule; (C) an organohydrogenpolysiloxane; and (D) a hydrosilylation reaction catalyst. An absolute value (ΔRI) of a difference between refractive indices of component (A) and component (B) measured at room temperature is less than 0.05. The curable silicone composition generally has excellent handleability, moldability, and mechanical strength (hardness, in particular) and flexibility of a cured product while achieving high transparency. Also disclosed is a resin sheet for an optical member including the composition or cured product thereof, and a light-emitting device or the like including the composition or cured product thereof.

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Ichihara, Japan

Mayumi Matsuzaki