THERMOSETTING ADHESIVE SHEET FOR FLEXIBLE PRINTED WIRING BOARD, MANUFACTURING METHOD THEREFOR AND MULTILAYER FLEXIBLE PRINTED WIRING BOARD AND FLEX-RIGID PRINTED WIRING BOARD USING THE SAME

摘要

PROBLEM TO BE SOLVED: To prepare a thermosetting adhesive sheet for a flexible printed wiring board, which causes little powder drop-off of an adhesive resin at processing and can be easily molded.;SOLUTION: The adhesive sheet comprises a substrate which comprises a woven or a nonwoven fabric and an adhesive resin composition, wherein the adhesive resin composition contains (A) an epoxy resin having at least two epoxy groups in the molecule, (B) at least one thermoplastic resin selected from the group consisting of a polyethersulfone, a polyetherimide and a phenoxy resin which are soluble to a solvent which dissolves the epoxy resin (A) and (C) an epoxy resin hardener (provided that the weight ratio of the epoxy resin (A) to the thermoplastic resin (B) is from 20:80 to 70:30). The adhesive sheet is used to bond the flexible printed wiring board made of a polyimide resin.;COPYRIGHT: (C)2006,JPO&NCIPI