Addition-curable silicone composition that produces cured product having high refractive index, and optical element encapsulating material formed from the composition

Abstract

Provided is an addition-curable silicone composition including A: a diorganopolysiloxane having a structure represented by a formula (1): (R1)(R2)2SiO((Ar)2SiO)Si(R2)2(R1) (where R1 represents an aliphatic unsaturated group, R2 represents identical or different, unsubstituted or substituted monovalent hydrocarbon groups, Ar represents identical or different, unsubstituted or substituted aryl groups that may or may not contain a hetero atom, and n represents an integer of 1 or greater), B: an organosilicon compound containing at least two hydrogen atoms bonded to silicon atoms per molecule, and containing no aliphatic unsaturated groups, in an amount that is sufficient to cure the composition in the presence of the hydrosilylation catalyst described below, and C: a platinum group metal-based hydrosilylation catalyst. A cured product of this addition-curable silicone composition has superior transparency, a high refractive index, and favorable strength properties, and the composition can therefore be used as an optical element encapsulating material.

Dependencies are inferred from the claim text.