Patent ID: 7157506
Filing Date: 2007-01-02
Classification: B32B,C08G,C08K,C08L,H05K,Y10T

Abstract:
1. A varnish comprising a resin composition including, as essential components, a cyanate compound (A) having 2 or more cyanato groups in the molecule; a phenol compound (B); a polyphenylene ether resin (C); and an inorganic filler (F) surface-treated with a silicone polymer (D) having at least one siloxane unit selected from the group consisting of a tri-functional siloxane unit represented by the formula RSiO 3/2 (wherein, R is an organic group, and when 2 or more Rs are present in the silicone polymer, they may be the same or different) and tetra-functional siloxane unit represented by SiO 4/2 , polymerization degree of 7,000 or less and at least one terminal functional group reactive with hydroxyl group, dissolved or dispersed in a solvent, wherein said solvent is a mixture of aromatic hydrocarbon and ketone.