Patent ID: 7638564
Filing Date: 2009-12-29
Classification: B32B,C08J,C08K,H05K,Y10T

Abstract:
1. A low dielectric loss tangent-resin varnish comprising: a thermosetting monomer (A) having a weight average molecular weight of not more than 1,000, a high polymer (B) having a weight average molecular weight of not less than 5,000, a flame-retardant agent (C) represented by a formula (1) or formula (2) shown below, a silicon dioxide filler (D), and an organic solvent (E), wherein an average particle diameter of each of the components (C) and (D) is in a range of 0.2 to 3.0 μm and the varnish has a viscosity of 0.1 to 1 Pa·s at 25° C.