Patent ID: 9157019
Filing Date: 2015-10-13
Classification: B82Y,C08K,C09K,H01L,H05K,Y10T

Abstract:
1. A ternary particle size thermally conductive filler composition with the addition of nano particles, the conductive filler having either of two distinct compositions: (A) Composition I comprising controlled particle size ratio and volume percentage ratio as follows: A-1 Large thermally conductive filler has a particle size range from 1-10 um, preferred 4-8 um in an amount of about 40 to 80 volume %, preferred 60 to 65 volume %; A-2, Small thermally conductive filler has a particle size range from 0.1-5 um, preferred 0.5-2 um in an amount of about 5 to 30 volume %, preferred 10 to 15 volume %; A-3, Nano thermally conductive filler has a particle size range from 10-800 nm, preferred 50-300 nm in an amount of about 10 to 40 volume %, preferred 15 to 30 volume %; A-4, Volume ratio of large thermally conductive filler to small thermally conductive filler is about 1:2 to 20:1, preferably 2:1 to 10:1; A-5, Volume ratio of large thermally conductive filler to nano thermally conductive filler is about 1:3 to 15:1, preferably 2:3 to 6:1; A-6, Volume ratio of small thermally conductive filler to nano thermally conductive filler is about 5:1 to 1:5, preferably 1:1 to 1:3; (B) Composition II comprising controlled particle size ratio and volume percentage ratio as follows: B-1, Large thermally conductive filler has a particle size range from 20-40 um, preferred 23-28 um in an amount of about 45 to 75 volume %, preferred 58 to 62 volume %, B-2, Small thermally conductive filler has a particle size range from 5-20 um, preferred 8-12 um in an amount of about 5 to 40 volume %, preferred 15 to 25 volume %; B-3, Nano thermally conductive filler has a particle size range from 10-800 nm, preferred 100-300 nm in an amount of about 10 to 50 volume %, preferred 25 to 30 volume %; B-4, Volume ratio of large thermally conductive filler to small thermally conductive filler is about 1:3 to 15:1, preferably 3:2 to 8:1; B-5, Volume ratio of large thermally conductive filler to nano thermally conductive filler is about 1:2 to 10:1, preferably 2:1 to 5:1; B-6, Volume ratio of small thermally conductive filler to nano thermally conductive filler is about 3:2 to 1:4, preferably 1:1 to 1:3.