Patent ID: 6780549
Filing Date: 2004-08-24
Classification: G03F,H05K

Abstract:
A photo- or heat-curable resin composition for forming a resin insulation layer in a printed wiring board comprising a resin-forming component and 0.1 to 1 parts by weight of silica sol with an average particle diameter in the range of 5 nm-0.5 &mgr;m per 100 parts by weight of the resin-forming componentwherein the resin-forming component comprises: (A) 100 parts by weight of a photopolymerizable unsaturated compound represented by the following general formula (1) wherein R is a hydrogen atom or a methyl group, A is a group represented by the formula (2) (wherein R1 and R2 are independently hydrogen, an alkyl group with 1-5 carbon atoms, or a halogen), X is â€”COâ€”, â€”SO2â€”, â€”C(CF3)2â€”, â€”Si(CH3)2â€”, â€”CH2â€”, â€”Oâ€”, â€”Sâ€”, or a direct bond, Y and Z are respectively the residue of a polycarboxylic acid or its acid anhydride, and m and n are the number of repeating units at a molar ratio m/n 0/100-100/0,(B) 0-50 parts by weight of a compound containing an epoxy group, (C) 0-10 parts by weight of a photopolymerization initiator or sensitizer.