Patent ID: 7867353
Filing Date: 2011-01-11
Classification: B32B,F28F,H05K,Y10T

Abstract:
1. A method of manufacturing a high or low frequency circuit board assembly having improved heat dissipation functionality comprising: providing a thermally and electrically conductive interface film including: a first side and a second side wherein the interface film comprises dimethyl polysiloxane, fire retardant, metal flakes and/or particles, a peroxide based catalyst, a first release layer protecting the first side, and a second release layer protecting the second side; removing the release layers; sandwiching the interface between a metal base layer of a printed circuit board and a planar side of a heat sink to form the assembly; first, in a room temperature hot press, applying a pressure of approximately 75 PSI for about 1 minute to the assembly to increase surface contact and to remove air pockets; then in the above hot press, applying a pressure of approximately 480 to 500 PSI to the assembly at a temperature of about 320 to 330 degrees Fahrenheit for at least 20 minutes to cure the interface and create a bonded laminate; and then in a cold press, applying a pressure of approximately 200 PSI to the assembly as the assembly cools to room temperature.