SILICONE COMPOSITION FOR ENCAPSULATING LUMINESCENT ELEMENT AND LUMINESCENT DEVICE

摘要

A silicone composition for encapsulating luminescent elements which comprises: (A) a vinylated organopolysiloxane of a three-dimensional network structure represented by the average rational formula (SiO 4/2)a(ViR2SiO1/2)b (R3SiO1/2)c (wherein Vi represents vinyl; R's are the same or different and each represents an (un)substituted monovalent hydrocarbon group other than alkenyl; and a, b, and c each is a positive number, provided that 0.2<=a/(a+b+c)<=0.6 and 0. 001<=b/(a+b+c)<=0.2); (B) an organohydrogenpolysiloxane which has at least two silicon-bonded hydrogen atoms per molecule and is contained in such an amount that the amount of the silicon-bonded hydrogen atoms is 0.3-3.0 mol per mol of the silicon-bonded vinyl groups in the ingredient (A); and (C) a hydrosilylation catalyst (catalytic amount). The composition after curing has a coefficient of linear expansion of 10x10^-6 to 290x10^-6 per °C. This composition can give a cured object which enables itself and the base to have a reduced residual stress and thereby retains satisfactory and stable adhesiveness over long.