| 摘要 |
PROBLEM TO BE SOLVED: To provide an addition-curable silicone composition that gives a cured product having high transparency, thermal discoloration resistance, high hardness and excellent adhesiveness and cracking resistance, and an optical element sealing material comprising the composition, and an optical element sealed with the optical element sealing material.SOLUTION: The addition-curable silicone composition comprises: (A) a compound expressed by formula (1) (where Me represents a methyl group, i represents an integer of 2 to 10, and the compound (1) is a single compound having no molecular weight distribution); (B) a three-dimensional mesh-like organopolysiloxane resin expressed by average composition formula (2):(RSiO)(RRSiO)(RRSiO)(RSiO)(RRSiO)(RSiO)(RSiO)(RSiO)(SiO)(where Rrepresents an alkenyl group, Rrepresents an organic group containing no aliphatic unsaturated bond, and at least 80 mol% of the whole Ris a methyl group); and (C) a hydrosilylation catalyst containing a platinum group metal. |
