| abstract |
A silicon-based curable composition providing improved transparency, mechanical strength and resistance against heat and photo-degradation comprises at least one organopolysiloxane represented by the composition formula (1):n n(R 1 3 SiO 1/2 ) a (R 1 2 SiO 2/2 ) b (R 1 R 2 SiO 2/2 ) c (R 1 SiO 3/2 ) d (R 2 SiO 3/2 ) e (R 1 2 R 2 SiO 1/2 ) f (1),n nwherein each R 2 independently represents a methacryloxyalkyl group having 5 to 20 carbon atoms and a≧0, b≧0, c≧0, d≧0, e≧0, f≧0, c+e>0, and a+b+c+d+e+f=1; and at least one curing catalyst. The product is ideal for encapsulation of LED (light emitting device) elements. |