| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a visible light-shielding silicone rubber composition which cures into a crack-free film having good shielding properties in the visible spectrum and good transmitting properties in the IR spectrum and is suited for the encapsulation of LEDs, its cured product, and an optical semiconductor device encapsulated with the composition in a cured state. <P>SOLUTION: The visible light-shielding silicone rubber composition includes (A) an organopolysiloxane containing at least two aliphatic unsaturated bonds in the molecule and having a viscosity of 10 to 100,000 mPa-s at 25°C, (B) an organohydrogenpolysiloxane, (C) a platinum group metal catalyst, and (D) an azo dye having a light transmittance of up to 10% in a wavelength range of up to 650 nm and at least 80% in a wavelength range of at least 750 nm, as measured by a light transmittance measurement method A, the transmittance measurement method A including steps of mixing the azo dye with ethanol in a weight ratio of 5:100, and measuring the transmittance of the mixture by a spectrophotometer. <P>COPYRIGHT: (C)2010,JPO&INPIT |
