Epoxy resin composition

摘要

An epoxy resin composition comprising a phosphorus-containing epoxy resin and an aromatic polysulfone resin. The epoxy resin composition gives an cured product has not only excellent toughness but also high flame retardancy and high heat resistance, and is advantageous as an insulation material for a multi-layer printed wiring board, particularly, as an insulation material for a build up substrate.