Curable composition

A curable composition that comprises:

• (A) a polymerized product comprising a linear organosiloxane compound that is represented by an average composition formula of Formula 1;
• (B) a crosslinked organosiloxane compound that is represented by an average composition formula of Formula 2;
• and
• (C) a hydrogen siloxane compound that is represented by Formula 3, and that satisfies the Equations 1 and 2:
• (R1R2R3SiO1/2)a(R4R5SiO2/2)b(R6S103/2)c(SiO4/2)d [Formula 1]
• (R7R8R9SiO1/2)e(R10R11SiO)f(R12SiO3/2)g(SiO4/2)h [Formula 2]
• wherein R1 to R12 independently represent an alkoxy group, a hydroxy group, an epoxy group or a monovalent hydrocarbon group, with the provision that at least one of R1 to R6 is an alkenyl group, at least one of R1 to R6 is an aryl group, at least one of R7 to R12 is an alkenyl group, at least one of R7 to R12 is an aryl group;
• R's independently represent hydrogen, an epoxy group or a monovalent hydrocarbon group, with the provision that at least one of the R's is an aryl group;
• a is in a range of 0 to 0.5, b is in a range of 0.5 to 0.98, c is in a range of 0 to 0.2, d is in a range of 0 to 0.1, e is in a range of 0 to 0.5, f is in a range of 0 to 0.3, g is in a range of 0.3 to 0.85, h is in a range of 0 to 0.2, n is in a range of 1 to 10, with the proviso that a+b+c+d is 1, e+f+g+h is 1, (a+b)/(a+b+c+d) is greater than 0.9, (g+4h/3)/(e+2f) is in a rang of 2 to 5, and g/(g+h) is greater than 0.85;
• |X(A)−X(B)|<0.4 [Equation 1]
• |X(B)−X(C)|<0.4 [Equation 2]
• wherein X(A) represents a molar ratio of an aryl group bound to a silicon atom with respect to the total silicon atoms in the linear organosiloxane compound or the polymerized product (A), X(B) represents a molar ratio of an aryl group bound to a silicon atom with respect to the total silicon atoms in the crosslinked organosiloxane compound (B), and X(C) represents a molar ratio of an aryl group bound to a silicon atom with respect to the total silicon atoms in the hydrogen siloxane compound (C).