Curable organopolysiloxane composition, cured product thereof, and transducer and the like equipped with said cured product

A curable organopolysiloxane composition, the composition comprising:

• (A1) a straight chain or branched organopolysiloxane having an alkenyl group only at an end of a molecular chain and a degree of siloxane polymerization within a range of 50 to 550;
• (A2) a straight chain or branched organopolysiloxane having an alkenyl group only at an end of a molecular chain and a degree of siloxane polymerization within a range of 600 to 1000;
• (B) hydrophobically treated reinforcing silica;
• (C) an organopolysiloxane resin containing an alkenyl group having at least one branched siloxane unit in a molecule with an amount of vinyl (CH2═CH—) groups within a range of 1.0 to 5.0 mass %;
• (D) an organohydrogenpolysiloxane having at least three silicon atom-bonded hydrogen atoms in a molecule;
• and
• (E) an effective amount of a hydrosilylation reaction catalyst;
• wherein
• the mass ratio of component (A1) to component (A2) ((A1)/(A2)) is within a range of 0.45 to 1.30,
• the sum of the components (B) and (C) is within a range of 10 to 25 mass % of the entire composition,
• the mass ratio of component (C) to the sum of components (B) and (C) ((C)/{(B)+(C)}) is within a range of 0 to 0.2, and
• the sum of silicon atom-bonded hydrogen atoms in component (B) is an amount of from 0.1 to 2.5 mol with respect to the total amount of 1 mol of an alkenyl group in the composition.