| 摘要 |
<p>PURPOSE: Provided are an epoxy resin composition containing phosphorus, a flame retardant, a resin sheet, a resin clad metal foil, a prepreg, a laminated board, and a multilayer board using the epoxy resin composition. CONSTITUTION: The epoxy resin composition comprises an epoxy resin composition(a) in which a phosphorus containing epoxy resin(A) and a hardener are contained. The phosphorus containing epoxy resin(A) is phosphorus containing resin composition prepared by reacting phosphorus containing organic compounds(B) obtained by the reaction in the range of molar ratio of 1.01 to 2 moles of organic phophorus compounds(b) having one active hydrogen atom bonded to phosphorus atom and 1 moles of quinone compound with at least one kind of epoxy resins(C) selected from the groups composed of formula 1, formula 2, or formula 3 so as the content of the epoxy resins(C) to be 20-45 wt%. In the formulas, R1 is a hydrogen atom and/or a phenyl group, m is an integer including 0, R2 is a hydrogen atom and/or a phenyl group, n is an integer including 0, R3 is a hydrogen atom and/or a phenyl group, l is an integer including 0, X is -CH2-, -O-, -CO-, -SO2-, -S-, -CH(C6H5)-, -C(C6H5)2-, not existing functional group or formula 4.</p> |
