| abstract |
PROBLEM TO BE SOLVED: To provide a halogen-free build-up insulating material for a build-up substrate, having excellent resistance to alkalis and acids, and having excellent mechanical properties such as breaking elongation and breaking strength. An insulating resin composition for a substrate is provided. A component A: an epoxy oligomer having two or more epoxy groups Component B: 10- (2.5-dihydroxyphenyl) -10H-9-oxa-10-phosphaphenanthrene-10-oxide or dihydro -3- (6-Oxide-6H-dibenz (c, e) (1,2) Oxaphospholin) -6-yl) methyl) -2,5 -An essential component is an epoxy curing agent composed of frangion. |