| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilayer printed wiring board which is superior in fire-resistance and anti-tracking characteristics. SOLUTION: A layer of matrix comprising (a) epoxy resin, (b) a thermosetting resin component, wherein polycondensation product between bisphenol A and formaldehyde are the essential components with a bromine content of 5-15 wt.%, and (c) a hardened product of a thermosetting resin composition, wherein aluminum hydroxide is the essential component with Na2 O content which is 0.2 wt.% or less, is an insulating layer contacting an external layer conductor. |
