Patent ID: 7674865
Filing Date: 2010-03-09
Classification: C08G,C08L,H01L,Y10T

Abstract:
1. An epoxy resin composition for photosemiconductor element encapsulation, which consists of the following components (A) to (E): (A) an epoxy resin, (B) an acid anhydride curing agent, (C) a silicone resin having constituent siloxane units represented by units A1 through A4 represented by the following general formulas (2) through (5), and the respective constitutional ratios for the units A1 through A4 are set to the following ratios (a) through (d): wherein n is 0 or 1 wherein n is 0, 1 or 2 wherein n is an integer from 0 to 3 wherein R is a substituted or unsubstituted, saturated monovalent hydrocarbon group having 1 to 18 carbon atoms or aromatic hydrocarbon group having 6 to 18 carbon atoms, and a plurality of R may be the same or different; and R (a) 0 to 30% by mole of unit A1, (b) 10 to 80% by mole of unit A2, (c) 20 to 90% by mole of unit A3, and (d) 0 to 30% by mole of unit A4, wherein the silicone resin has at least one hydroxyl group or alkoxy group bonded to a silicon atom per molecule, wherein substituted or unsubstituted aromatic hydrocarbon groups occupy 10% by mole or greater among the monovalent hydrocarbon groups (R) bonded to silicon atoms, and wherein the amount of the hydroxyl group or alkoxy group bonded to a silicon atom is set to the range of 0.1 to 15% by weight in terms of the OH group, (D) a hardening accelerator, and (E) a deterioration inhibitor.