Patent ID: 6210520
Filing Date: 2001-04-03
Classification: C08K,C09D

Abstract:
A method of forming a thermally conductive film upon a substrate, said film having a thermal conductivity of at least about 1.5 (W/m.degree. K) and a modulus of from about 500 to about 250,000 at 25.degree. C. comprising the steps of:(I) providing a composition comprising by weight from about 35% to about 75% of a thermally curable vinyl terminated siloxane resin, from about 0.005% to about 5% catalyst, from about 10% to about 30% hydrocarbon solvent and from about 20% to about 70% conductive filler, said composition having a viscosity of from about 5,000 to about 50,000 centipoise at 25.degree. C.;(ii) screen printing said composition upon a substrate to form a layer having a thickness of from about 0.001"" to about 0.005""; and(iii) subjecting said layer to a source of heat in order to cure said composition and form a conductive film layer having a thermal conductivity of at least 1.5 (W/m.degree. K) and a modulus of at least about 500 at 25.degree. C.