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(ViR₂SiO_1/2)_b(R₃SiO_1/2)_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 10×10^-6 to 290×10^-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.