| abstract |
An object of the present invention is to provide a silicone that seals an LED that emits blue to ultraviolet light, has excellent transparency, has light resistance and heat resistance, is hard and hard to crack, has little shrinkage during molding, and has an excellent balance between strength and hardness. An encapsulant for the system is provided. (A) An organic resin comprising at least one kind of polyorganosiloxane, and a mixture thereof has an average composition formula of (R 1 R 2 R 3 SiO 1/2 ) M · (R 4 R 5 SiO 2/2 ) D · (R 6 SiO 3/2) T · (SiO 4/2) Q ( where, R 1 to R 6 are each organic group which may be the same or different, selected from hydroxyl group or hydrogen atom, and, R At least one of 1 to R 6 includes a hydrocarbon group having a multiple bond and / or a hydrogen atom, M, D, T, and Q are numbers from 0 to less than 1, and M + D + T + Q = 1, Q + T> 0 An LED sealing composition comprising a polyorganosiloxane represented by the formula (1) and an effective amount of a catalyst (2) for an addition reaction, which is cured into a resinous state. [Selection diagram] No selection diagram |