| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a semiconductor light emitting device using a silicone resin-based sealing material, which prevents color changes with time of a lead electrode to maintain brightness of the light emitting device. <P>SOLUTION: A silicone-based sealing material composition containing (A) a bifunctional thermosetting silicone resin, (B) a polyfunctional thermosetting silicone resin and (C) a hardening catalyst has the following features. (1) The rate (weight ratio) of (B) present in the total amount of (A) and (B) is 0.5/100 or greater and less than 100/100. (2) The functional number of the component (B) is 2.5 or greater and 4.0 or less. (3) The weight average molecular weight of the component (B) is 1000 to 10000. (4) At a temperature of 80°C, (A) and (B) are immiscible with each other and the density of (B) is higher by 0.01 g/cm<SP POS="POST">3</SP>or more than that of (A). <P>COPYRIGHT: (C)2013,JPO&INPIT |
