abstract |
A curable silicone composition characteristically comprises (A) (A-I) an alkenyl- containingdialkylpolysiloxane and a viscosity of at least 1,000 mPa s to not more than 20,000 mPa-s and (A-2) an alkenyl-containing, resin-form organopolysiloxane that comprises the SiO 4/2 unit, R 1 n 2 R 2 SiO 1/2 unit, and R 1 n 3 SiO 1/2 unit wherein R 1 is alkyl and R 2 is alkenyl, that contains from 2.5 to 5.0 mass% alkenyl group, and that has a ratio for the total number of moles of R 1 n 2 R 2 SiO 1/2 and R 1 n 3 SiO 1/2 units to 1 mole of the SiO 4/2 unit in the range from 0.70 to 1.10; (B) an organopolysiloxane that contains at least 0.9 mass% silicon-bonded hydrogen; and (C) a hydrosilylation reaction catalyst and provides a bending-tolerant and highly transparent cured silicone material that characteristically has a hardness is in the range from 80 to 95, the parallel light transmittance at 200°C is a value that is at least 99% of the parallel light transmittance at 25°C. |