MULTILAYER PRINTED WIRING BOARD AND METHOD FOR MAKING SAME

摘要

A multilayer printed wiring board is disclosed having (a) an inner layer conductive pattern (13) on an organic insulating base material; (b) a poly(vinyl acetal)-phenolic resin coating (14) containing an amine substituted organic zirconate or titanate coupling agent; (c) a dielectric insulating layer (15); (d) a bonding composition (16) capable of being adhesion promoted for electroless metal deposition comprising a phenolic resin having at least two methylol groups and substantially free of methyl ether groups, a heat resistant aromatic or cyclic resin having functional groups capable of reacting with the methylol groups without the evolution of water; and (e) an outer conductive pattern (19), the multilayer board being capable of withstanding at least five soldering cycles of at least 255 DEG C for 2 seconds without blistering or delamination. Processes for the manufacture of the inventive multilayer boards are also disclosed.