FILLER, ITS PREPARATION, RESIN MATERIAL FOR INSULATING LAYER AND MULTI-LAYERED PRINTED-WIRING BOARD

摘要

PROBLEM TO BE SOLVED: To provide a filler which separates from the insulating layer through rough treatment and forms a dent which contributes to the peel strength of the conductor formed on the insulating layer through electroless plating, its preparation method, a resin material for an insulating layer using this filler and a multi-layered printed-wiring board. SOLUTION: A filler comprises an inorganic powder bound with an acrylonitrile-butadiene rubber (NBR) having a functional group in the molecule. This filler is prepared by allowing an inorganic powder, to which an epoxysilane is attached, to react with an NBR having a functional group in the molecule in the presence of a catalyst. This filler is used as a resin material for an insulating layer in electroless plating to compose a multi-layered printed-wiring board.