Patent ID: 10696794

Abstract:
Addition-curable silicone composition providing cured product having good performance at low temperature and excellent resistance to a temperature change. Also, semiconductor device having high reliability, whose semiconductor element is encapsulated with a cured addition-curable silicone resin composition comprising (A) a branched organopolysiloxane of formula (1): wherein a is an integer of 2-100, b is an integer of 5-100, c is an integer of 5-100, 0.03≤a/(a+b)<1.0, and a ratio of (R12R2SiO1/2) units to (R2SiO3/2) units is ≤2; (B) an organopolysiloxane of formula (2): (R23SiO1/2)r(R22SiO2/2)s(R2SiO3/2)t(SiO4/2)u  (2) in an amount of 5-900 parts by mass, relative to 100 parts by mass of (A); (C) an organopolysiloxane having at least two hydrosilyl groups, in an amount such that a ratio of the number of the hydrosilyl groups in (C) to the number of the alkenyl groups in (A) and (B) is 0.4-4.0; and (D) a hydrosilylation catalyst in an amount sufficient to accelerate hydrosilylation.