Addition-curable silicone composition, the optical element encapsulating material formed from the composition, method of producing an optical element, and addition-curable silicone composition encapsulated with the optical element sealing material

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):(R²₃SiO_1/2)_k(R¹R²₂SiO_1/2)_m(R¹₂R²SiO_1/2)_n(R¹₃SiO_1/2)_p(R¹R²SiO)_q(R²₂SiO)_r(R¹SiO_3/2)_s(R²SiO_3/2)_t(SiO₂)_u (where R¹ represents an alkenyl group, R² represents an organic group containing no aliphatic unsaturated bond, and at least 80 mol% of the whole R² is a methyl group); and (C) a hydrosilylation catalyst containing a platinum group metal.;COPYRIGHT: (C)2014,JPO&INPIT