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,例如与一种混合了单、双和三羟基芳基膦氧化物的诺佛
酚树脂混合物,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单羟基芳基、双羟基芳基和三羟基芳基膦氧化物的混合物以及苯并三嗪/
酚/
甲醛三聚物,与环氧
树脂一起使用以生产无卤素阻燃印制电路板。