EPOXY RESIN COMPOSITION, RESIN SHEET AND MULTILAYER PRINTED-WIRING BOARD

摘要

PROBLEM TO BE SOLVED: To provide a resin sheet capable of retaining a sheet form without depending on a woven glass fabric and capable of forming an insulating layer of low dielectric characteristic. SOLUTION: This resin sheet is produced by shaping into a sheet an epoxy resin composition comprising (a) an epoxy resin obtained by epoxidizing a polycondensation product of at least one kind selected from the group consisting of bisphenol A, bisphenol F and bisphenol AD with formaldehyde, (b) a polycondensation product of phenols with formaldehyde, (c) a phenol adduct of polybutadiene and (d) rubber as essential ingredients. A multilayered printed- wiring board is produced by applying the resultant resin sheet as an insulating layer-forming material.