| abstract |
An object of the present invention is to provide a curable resin composition that forms a cured product having excellent heat resistance, light resistance, and flexibility.n n n The present invention provides a curable resin composition containing the following components.n n n (A): Polyorganosiloxane represented by the following average unit formula: (SiO 4/2 ) a1 (R 1 SiO 3/2 ) a2 (R 1 2 SiO 2/2 ) a3 (R 1 3 SiO 1 / 2 ) a4 n n n [R 1 is an alkyl group, an aryl group, an alkenyl group, etc., with respect to the total amount of R 1 , the proportion of the alkyl group is 50 to 98 mol%, the proportion of the aryl group is 1 to 50 mol%, and the proportion of the alkenyl group It is 1 to 35 mole%. a1> 0, a2> 0, a3 0, a4> 0, 0.01 a1 / a2 10, a1 + a2 + a3 + a4 = 1]n n n (B): Polyorganosiloxane represented by the following average experimental formula: R 2 m H n SiO [(4-mn) / 2] n n n [R 2 is alkyl or aryl. 0.7 m 2.1, 0.001 n 1.5 and 0.8 m + n 3]n n n (C): Zirconium compoundn n n (D): Silane catalyst |