| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilayer printed wiring board where no toxic material such as cyano radical or halogen material is possible to be generated. SOLUTION: The multilayer printed wiring board comprises, at least, a substrate 1, a first circuit pattern 2a formed on the substrate 1, an insulating layer 3a so formed on the substrate 1 as to shield the first circuit pattern 2a, a non- through hole 5 so formed at the insulating layer 3a as to expose the first circuit pattern 2a, and a second circuit pattern 6 so continuously formed on the insulating layer 3a from the inside wall of the non-through hole 5a as to connect to the first circuit pattern 2a. The insulating layer 3a comprises an insulating material comprising a bisphenol A-type epoxy resin excluding a halogenated epoxy resin by 40-50 wt.%, a phenol resin by 40-52 wt.%, and a phosphorous- containing aromatic compound by 8-10 wt.%. |
