Patent ID: 9670377
Date: 2017-06-06
CPC Classifications: C08G,C08K,C08L,C09D,H01L

Claim:
1. An underfill composition for encapsulating a bond line having a thickness of 50 microns or less, comprising: an epoxy resin; a curing agent; and a plurality of filler particles, wherein the filler particles have a maximum particle size of about 3 microns, a trimodal particle size distribution, and have an aspect ratio of about one, wherein the underfill composition in an uncured state has a fluidity value that is less than about ten minutes over about a two centimeter distance at a temperature of about 90 degrees C. within a bond line having a thickness of about 50 microns, wherein the underfill composition in a cured state has a bulk thermal conductivity that is greater than about 0.8 W/mK, wherein the filler particles include zinc oxide, and wherein the particle size of the zinc oxide is between about 0.2 microns and 2.0 microns, and the amount of the zinc oxide is between 5 to 15 vol %.