There is disclosed a novel mixture of polyhydroxy phenolic curing agents, such as novolac resins blended with a mixture of mono, bis and tris hydroxyaryl phosphine oxides for co-curing epoxy resins and imparting flame resistance thereto. A preferred composition includes a mixture of monohydroxyaryl, bishydroxyaryl and trishydroxyaryl phosphine oxide and a benzoguanamine/phenol/formaldehyde terpolymer which is used along with an epoxy resin to produce flame-resistant printed wiring boards without the use of halogens.
本发明公开了一种新型的多羟基
酚固化剂混合物,例如Novolac
树脂与一种单、双和三羟基芳基膦氧化物混合物,用于共固化环氧
树脂并赋予其阻燃性。一种优选的组合物包括一种单羟基芳基、双羟基芳基和三羟基芳基膦氧化物混合物以及一种苯并三嗪/
苯酚/
甲醛共聚物,该共聚物与环氧
树脂一起使用,以生产无卤素阻燃印刷电路板。